drivers/net/ieee802154/ca8210.c

   1 /*
   2  * http://www.cascoda.com/products/ca-821x/
   3  * Copyright (c) 2016, Cascoda, Ltd.
   4  * All rights reserved.
   5  *
   6  * This code is dual-licensed under both GPLv2 and 3-clause BSD. What follows is
   7  * the license notice for both respectively.
   8  *
   9  *******************************************************************************
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  *******************************************************************************
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions are met:
  25  *
  26  * 1. Redistributions of source code must retain the above copyright notice,
  27  * this list of conditions and the following disclaimer.
  28  *
  29  * 2. Redistributions in binary form must reproduce the above copyright notice,
  30  * this list of conditions and the following disclaimer in the documentation
  31  * and/or other materials provided with the distribution.
  32  *
  33  * 3. Neither the name of the copyright holder nor the names of its contributors
  34  * may be used to endorse or promote products derived from this software without
  35  * specific prior written permission.
  36  *
  37  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  38  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  39  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  40  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS BE
  41  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  42  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  43  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  44  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  45  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  46  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  47  * POSSIBILITY OF SUCH DAMAGE.
  48  */
  49
  50 #include <linux/cdev.h>
  51 #include <linux/clk-provider.h>
  52 #include <linux/debugfs.h>
  53 #include <linux/delay.h>
  54 #include <linux/gpio.h>
  55 #include <linux/ieee802154.h>
  56 #include <linux/kfifo.h>
  57 #include <linux/of.h>
  58 #include <linux/of_device.h>
  59 #include <linux/of_gpio.h>
  60 #include <linux/module.h>
  61 #include <linux/mutex.h>
  62 #include <linux/poll.h>
  63 #include <linux/skbuff.h>
  64 #include <linux/slab.h>
  65 #include <linux/spi/spi.h>
  66 #include <linux/spinlock.h>
  67 #include <linux/string.h>
  68 #include <linux/workqueue.h>
  69 #include <linux/interrupt.h>
  70
  71 #include <net/ieee802154_netdev.h>
  72 #include <net/mac802154.h>
  73
  74 #define DRIVER_NAME "ca8210"
  75
  76 /* external clock frequencies */
  77 #define ONE_MHZ      1000000
  78 #define TWO_MHZ      (2 * ONE_MHZ)
  79 #define FOUR_MHZ     (4 * ONE_MHZ)
  80 #define EIGHT_MHZ    (8 * ONE_MHZ)
  81 #define SIXTEEN_MHZ  (16 * ONE_MHZ)
  82
  83 /* spi constants */
  84 #define CA8210_SPI_BUF_SIZE 256
  85 #define CA8210_SYNC_TIMEOUT 1000     /* Timeout for synchronous commands [ms] */
  86
  87 /* test interface constants */
  88 #define CA8210_TEST_INT_FILE_NAME "ca8210_test"
  89 #define CA8210_TEST_INT_FIFO_SIZE 256
  90
  91 /* MAC status enumerations */
  92 #define MAC_SUCCESS                     (0x00)
  93 #define MAC_ERROR                       (0x01)
  94 #define MAC_CANCELLED                   (0x02)
  95 #define MAC_READY_FOR_POLL              (0x03)
  96 #define MAC_COUNTER_ERROR               (0xDB)
  97 #define MAC_IMPROPER_KEY_TYPE           (0xDC)
  98 #define MAC_IMPROPER_SECURITY_LEVEL     (0xDD)
  99 #define MAC_UNSUPPORTED_LEGACY          (0xDE)
 100 #define MAC_UNSUPPORTED_SECURITY        (0xDF)
 101 #define MAC_BEACON_LOST                 (0xE0)
 102 #define MAC_CHANNEL_ACCESS_FAILURE      (0xE1)
 103 #define MAC_DENIED                      (0xE2)
 104 #define MAC_DISABLE_TRX_FAILURE         (0xE3)
 105 #define MAC_SECURITY_ERROR              (0xE4)
 106 #define MAC_FRAME_TOO_LONG              (0xE5)
 107 #define MAC_INVALID_GTS                 (0xE6)
 108 #define MAC_INVALID_HANDLE              (0xE7)
 109 #define MAC_INVALID_PARAMETER           (0xE8)
 110 #define MAC_NO_ACK                      (0xE9)
 111 #define MAC_NO_BEACON                   (0xEA)
 112 #define MAC_NO_DATA                     (0xEB)
 113 #define MAC_NO_SHORT_ADDRESS            (0xEC)
 114 #define MAC_OUT_OF_CAP                  (0xED)
 115 #define MAC_PAN_ID_CONFLICT             (0xEE)
 116 #define MAC_REALIGNMENT                 (0xEF)
 117 #define MAC_TRANSACTION_EXPIRED         (0xF0)
 118 #define MAC_TRANSACTION_OVERFLOW        (0xF1)
 119 #define MAC_TX_ACTIVE                   (0xF2)
 120 #define MAC_UNAVAILABLE_KEY             (0xF3)
 121 #define MAC_UNSUPPORTED_ATTRIBUTE       (0xF4)
 122 #define MAC_INVALID_ADDRESS             (0xF5)
 123 #define MAC_ON_TIME_TOO_LONG            (0xF6)
 124 #define MAC_PAST_TIME                   (0xF7)
 125 #define MAC_TRACKING_OFF                (0xF8)
 126 #define MAC_INVALID_INDEX               (0xF9)
 127 #define MAC_LIMIT_REACHED               (0xFA)
 128 #define MAC_READ_ONLY                   (0xFB)
 129 #define MAC_SCAN_IN_PROGRESS            (0xFC)
 130 #define MAC_SUPERFRAME_OVERLAP          (0xFD)
 131 #define MAC_SYSTEM_ERROR                (0xFF)
 132
 133 /* HWME attribute IDs */
 134 #define HWME_EDTHRESHOLD       (0x04)
 135 #define HWME_EDVALUE           (0x06)
 136 #define HWME_SYSCLKOUT         (0x0F)
 137 #define HWME_LQILIMIT          (0x11)
 138
 139 /* TDME attribute IDs */
 140 #define TDME_CHANNEL          (0x00)
 141 #define TDME_ATM_CONFIG       (0x06)
 142
 143 #define MAX_HWME_ATTRIBUTE_SIZE  16
 144 #define MAX_TDME_ATTRIBUTE_SIZE  2
 145
 146 /* PHY/MAC PIB Attribute Enumerations */
 147 #define PHY_CURRENT_CHANNEL               (0x00)
 148 #define PHY_TRANSMIT_POWER                (0x02)
 149 #define PHY_CCA_MODE                      (0x03)
 150 #define MAC_ASSOCIATION_PERMIT            (0x41)
 151 #define MAC_AUTO_REQUEST                  (0x42)
 152 #define MAC_BATT_LIFE_EXT                 (0x43)
 153 #define MAC_BATT_LIFE_EXT_PERIODS         (0x44)
 154 #define MAC_BEACON_PAYLOAD                (0x45)
 155 #define MAC_BEACON_PAYLOAD_LENGTH         (0x46)
 156 #define MAC_BEACON_ORDER                  (0x47)
 157 #define MAC_GTS_PERMIT                    (0x4d)
 158 #define MAC_MAX_CSMA_BACKOFFS             (0x4e)
 159 #define MAC_MIN_BE                        (0x4f)
 160 #define MAC_PAN_ID                        (0x50)
 161 #define MAC_PROMISCUOUS_MODE              (0x51)
 162 #define MAC_RX_ON_WHEN_IDLE               (0x52)
 163 #define MAC_SHORT_ADDRESS                 (0x53)
 164 #define MAC_SUPERFRAME_ORDER              (0x54)
 165 #define MAC_ASSOCIATED_PAN_COORD          (0x56)
 166 #define MAC_MAX_BE                        (0x57)
 167 #define MAC_MAX_FRAME_RETRIES             (0x59)
 168 #define MAC_RESPONSE_WAIT_TIME            (0x5A)
 169 #define MAC_SECURITY_ENABLED              (0x5D)
 170
 171 #define MAC_AUTO_REQUEST_SECURITY_LEVEL   (0x78)
 172 #define MAC_AUTO_REQUEST_KEY_ID_MODE      (0x79)
 173
 174 #define NS_IEEE_ADDRESS                   (0xFF) /* Non-standard IEEE address */
 175
 176 /* MAC Address Mode Definitions */
 177 #define MAC_MODE_NO_ADDR                (0x00)
 178 #define MAC_MODE_SHORT_ADDR             (0x02)
 179 #define MAC_MODE_LONG_ADDR              (0x03)
 180
 181 /* MAC constants */
 182 #define MAX_BEACON_OVERHEAD        (75)
 183 #define MAX_BEACON_PAYLOAD_LENGTH  (IEEE802154_MTU - MAX_BEACON_OVERHEAD)
 184
 185 #define MAX_ATTRIBUTE_SIZE              (122)
 186 #define MAX_DATA_SIZE                   (114)
 187
 188 #define CA8210_VALID_CHANNELS                 (0x07FFF800)
 189
 190 /* MAC workarounds for V1.1 and MPW silicon (V0.x) */
 191 #define CA8210_MAC_WORKAROUNDS (0)
 192 #define CA8210_MAC_MPW         (0)
 193
 194 /* memory manipulation macros */
 195 #define LS_BYTE(x)     ((u8)((x) & 0xFF))
 196 #define MS_BYTE(x)     ((u8)(((x) >> 8) & 0xFF))
 197
 198 /* message ID codes in SPI commands */
 199 /* downstream */
 200 #define MCPS_DATA_REQUEST                     (0x00)
 201 #define MLME_ASSOCIATE_REQUEST                (0x02)
 202 #define MLME_ASSOCIATE_RESPONSE               (0x03)
 203 #define MLME_DISASSOCIATE_REQUEST             (0x04)
 204 #define MLME_GET_REQUEST                      (0x05)
 205 #define MLME_ORPHAN_RESPONSE                  (0x06)
 206 #define MLME_RESET_REQUEST                    (0x07)
 207 #define MLME_RX_ENABLE_REQUEST                (0x08)
 208 #define MLME_SCAN_REQUEST                     (0x09)
 209 #define MLME_SET_REQUEST                      (0x0A)
 210 #define MLME_START_REQUEST                    (0x0B)
 211 #define MLME_POLL_REQUEST                     (0x0D)
 212 #define HWME_SET_REQUEST                      (0x0E)
 213 #define HWME_GET_REQUEST                      (0x0F)
 214 #define TDME_SETSFR_REQUEST                   (0x11)
 215 #define TDME_GETSFR_REQUEST                   (0x12)
 216 #define TDME_SET_REQUEST                      (0x14)
 217 /* upstream */
 218 #define MCPS_DATA_INDICATION                  (0x00)
 219 #define MCPS_DATA_CONFIRM                     (0x01)
 220 #define MLME_RESET_CONFIRM                    (0x0A)
 221 #define MLME_SET_CONFIRM                      (0x0E)
 222 #define MLME_START_CONFIRM                    (0x0F)
 223 #define HWME_SET_CONFIRM                      (0x12)
 224 #define HWME_GET_CONFIRM                      (0x13)
 225 #define HWME_WAKEUP_INDICATION                (0x15)
 226 #define TDME_SETSFR_CONFIRM                   (0x17)
 227
 228 /* SPI command IDs */
 229 /* bit indicating a confirm or indication from slave to master */
 230 #define SPI_S2M                            (0x20)
 231 /* bit indicating a synchronous message */
 232 #define SPI_SYN                            (0x40)
 233
 234 /* SPI command definitions */
 235 #define SPI_IDLE                           (0xFF)
 236 #define SPI_NACK                           (0xF0)
 237
 238 #define SPI_MCPS_DATA_REQUEST          (MCPS_DATA_REQUEST)
 239 #define SPI_MCPS_DATA_INDICATION       (MCPS_DATA_INDICATION + SPI_S2M)
 240 #define SPI_MCPS_DATA_CONFIRM          (MCPS_DATA_CONFIRM + SPI_S2M)
 241
 242 #define SPI_MLME_ASSOCIATE_REQUEST     (MLME_ASSOCIATE_REQUEST)
 243 #define SPI_MLME_RESET_REQUEST         (MLME_RESET_REQUEST + SPI_SYN)
 244 #define SPI_MLME_SET_REQUEST           (MLME_SET_REQUEST + SPI_SYN)
 245 #define SPI_MLME_START_REQUEST         (MLME_START_REQUEST + SPI_SYN)
 246 #define SPI_MLME_RESET_CONFIRM         (MLME_RESET_CONFIRM + SPI_S2M + SPI_SYN)
 247 #define SPI_MLME_SET_CONFIRM           (MLME_SET_CONFIRM + SPI_S2M + SPI_SYN)
 248 #define SPI_MLME_START_CONFIRM         (MLME_START_CONFIRM + SPI_S2M + SPI_SYN)
 249
 250 #define SPI_HWME_SET_REQUEST           (HWME_SET_REQUEST + SPI_SYN)
 251 #define SPI_HWME_GET_REQUEST           (HWME_GET_REQUEST + SPI_SYN)
 252 #define SPI_HWME_SET_CONFIRM           (HWME_SET_CONFIRM + SPI_S2M + SPI_SYN)
 253 #define SPI_HWME_GET_CONFIRM           (HWME_GET_CONFIRM + SPI_S2M + SPI_SYN)
 254 #define SPI_HWME_WAKEUP_INDICATION     (HWME_WAKEUP_INDICATION + SPI_S2M)
 255
 256 #define SPI_TDME_SETSFR_REQUEST        (TDME_SETSFR_REQUEST + SPI_SYN)
 257 #define SPI_TDME_SET_REQUEST           (TDME_SET_REQUEST + SPI_SYN)
 258 #define SPI_TDME_SETSFR_CONFIRM        (TDME_SETSFR_CONFIRM + SPI_S2M + SPI_SYN)
 259
 260 /* TDME SFR addresses */
 261 /* Page 0 */
 262 #define CA8210_SFR_PACFG                   (0xB1)
 263 #define CA8210_SFR_MACCON                  (0xD8)
 264 #define CA8210_SFR_PACFGIB                 (0xFE)
 265 /* Page 1 */
 266 #define CA8210_SFR_LOTXCAL                 (0xBF)
 267 #define CA8210_SFR_PTHRH                   (0xD1)
 268 #define CA8210_SFR_PRECFG                  (0xD3)
 269 #define CA8210_SFR_LNAGX40                 (0xE1)
 270 #define CA8210_SFR_LNAGX41                 (0xE2)
 271 #define CA8210_SFR_LNAGX42                 (0xE3)
 272 #define CA8210_SFR_LNAGX43                 (0xE4)
 273 #define CA8210_SFR_LNAGX44                 (0xE5)
 274 #define CA8210_SFR_LNAGX45                 (0xE6)
 275 #define CA8210_SFR_LNAGX46                 (0xE7)
 276 #define CA8210_SFR_LNAGX47                 (0xE9)
 277
 278 #define PACFGIB_DEFAULT_CURRENT            (0x3F)
 279 #define PTHRH_DEFAULT_THRESHOLD            (0x5A)
 280 #define LNAGX40_DEFAULT_GAIN               (0x29) /* 10dB */
 281 #define LNAGX41_DEFAULT_GAIN               (0x54) /* 21dB */
 282 #define LNAGX42_DEFAULT_GAIN               (0x6C) /* 27dB */
 283 #define LNAGX43_DEFAULT_GAIN               (0x7A) /* 30dB */
 284 #define LNAGX44_DEFAULT_GAIN               (0x84) /* 33dB */
 285 #define LNAGX45_DEFAULT_GAIN               (0x8B) /* 34dB */
 286 #define LNAGX46_DEFAULT_GAIN               (0x92) /* 36dB */
 287 #define LNAGX47_DEFAULT_GAIN               (0x96) /* 37dB */
 288
 289 #define CA8210_IOCTL_HARD_RESET            (0x00)
 290
 291 /* Structs/Enums */
 292
 293 /**
 294  * struct cas_control - spi transfer structure
 295  * @msg:                  spi_message for each exchange
 296  * @transfer:             spi_transfer for each exchange
 297  * @tx_buf:               source array for transmission
 298  * @tx_in_buf:            array storing bytes received during transmission
 299  * @priv:                 pointer to private data
 300  *
 301  * This structure stores all the necessary data passed around during a single
 302  * spi exchange.
 303  */
 304 struct cas_control {
 305         struct spi_message msg;
 306         struct spi_transfer transfer;
 307
 308         u8 tx_buf[CA8210_SPI_BUF_SIZE];
 309         u8 tx_in_buf[CA8210_SPI_BUF_SIZE];
 310
 311         struct ca8210_priv *priv;
 312 };
 313
 314 /**
 315  * struct ca8210_test - ca8210 test interface structure
 316  * @ca8210_dfs_spi_int: pointer to the entry in the debug fs for this device
 317  * @up_fifo:            fifo for upstream messages
 318  *
 319  * This structure stores all the data pertaining to the debug interface
 320  */
 321 struct ca8210_test {
 322         struct dentry *ca8210_dfs_spi_int;
 323         struct kfifo up_fifo;
 324         wait_queue_head_t readq;
 325 };
 326
 327 /**
 328  * struct ca8210_priv - ca8210 private data structure
 329  * @spi:                    pointer to the ca8210 spi device object
 330  * @hw:                     pointer to the ca8210 ieee802154_hw object
 331  * @hw_registered:          true if hw has been registered with ieee802154
 332  * @lock:                   spinlock protecting the private data area
 333  * @mlme_workqueue:           workqueue for triggering MLME Reset
 334  * @irq_workqueue:          workqueue for irq processing
 335  * @tx_skb:                 current socket buffer to transmit
 336  * @nextmsduhandle:         msdu handle to pass to the 15.4 MAC layer for the
 337  *                           next transmission
 338  * @clk:                    external clock provided by the ca8210
 339  * @last_dsn:               sequence number of last data packet received, for
 340  *                           resend detection
 341  * @test:                   test interface data section for this instance
 342  * @async_tx_pending:       true if an asynchronous transmission was started and
 343  *                           is not complete
 344  * @sync_command_response:  pointer to buffer to fill with sync response
 345  * @ca8210_is_awake:        nonzero if ca8210 is initialised, ready for comms
 346  * @sync_down:              counts number of downstream synchronous commands
 347  * @sync_up:                counts number of upstream synchronous commands
 348  * @spi_transfer_complete   completion object for a single spi_transfer
 349  * @sync_exchange_complete  completion object for a complete synchronous API
 350  *                           exchange
 351  * @promiscuous             whether the ca8210 is in promiscuous mode or not
 352  * @retries:                records how many times the current pending spi
 353  *                           transfer has been retried
 354  */
 355 struct ca8210_priv {
 356         struct spi_device *spi;
 357         struct ieee802154_hw *hw;
 358         bool hw_registered;
 359         spinlock_t lock;
 360         struct workqueue_struct *mlme_workqueue;
 361         struct workqueue_struct *irq_workqueue;
 362         struct sk_buff *tx_skb;
 363         u8 nextmsduhandle;
 364         struct clk *clk;
 365         int last_dsn;
 366         struct ca8210_test test;
 367         bool async_tx_pending;
 368         u8 *sync_command_response;
 369         struct completion ca8210_is_awake;
 370         int sync_down, sync_up;
 371         struct completion spi_transfer_complete, sync_exchange_complete;
 372         bool promiscuous;
 373         int retries;
 374 };
 375
 376 /**
 377  * struct work_priv_container - link between a work object and the relevant
 378  *                              device's private data
 379  * @work: work object being executed
 380  * @priv: device's private data section
 381  *
 382  */
 383 struct work_priv_container {
 384         struct work_struct work;
 385         struct ca8210_priv *priv;
 386 };
 387
 388 /**
 389  * struct ca8210_platform_data - ca8210 platform data structure
 390  * @extclockenable: true if the external clock is to be enabled
 391  * @extclockfreq:   frequency of the external clock
 392  * @extclockgpio:   ca8210 output gpio of the external clock
 393  * @gpio_reset:     gpio number of ca8210 reset line
 394  * @gpio_irq:       gpio number of ca8210 interrupt line
 395  * @irq_id:         identifier for the ca8210 irq
 396  *
 397  */
 398 struct ca8210_platform_data {
 399         bool extclockenable;
 400         unsigned int extclockfreq;
 401         unsigned int extclockgpio;
 402         int gpio_reset;
 403         int gpio_irq;
 404         int irq_id;
 405 };
 406
 407 /**
 408  * struct fulladdr - full MAC addressing information structure
 409  * @mode:    address mode (none, short, extended)
 410  * @pan_id:  16-bit LE pan id
 411  * @address: LE address, variable length as specified by mode
 412  *
 413  */
 414 struct fulladdr {
 415         u8         mode;
 416         u8         pan_id[2];
 417         u8         address[8];
 418 };
 419
 420 /**
 421  * union macaddr: generic MAC address container
 422  * @short_addr:   16-bit short address
 423  * @ieee_address: 64-bit extended address as LE byte array
 424  *
 425  */
 426 union macaddr {
 427         u16        short_address;
 428         u8         ieee_address[8];
 429 };
 430
 431 /**
 432  * struct secspec: security specification for SAP commands
 433  * @security_level: 0-7, controls level of authentication & encryption
 434  * @key_id_mode:    0-3, specifies how to obtain key
 435  * @key_source:     extended key retrieval data
 436  * @key_index:      single-byte key identifier
 437  *
 438  */
 439 struct secspec {
 440         u8         security_level;
 441         u8         key_id_mode;
 442         u8         key_source[8];
 443         u8         key_index;
 444 };
 445
 446 /* downlink functions parameter set definitions */
 447 struct mcps_data_request_pset {
 448         u8              src_addr_mode;
 449         struct fulladdr dst;
 450         u8              msdu_length;
 451         u8              msdu_handle;
 452         u8              tx_options;
 453         u8              msdu[MAX_DATA_SIZE];
 454 };
 455
 456 struct mlme_set_request_pset {
 457         u8         pib_attribute;
 458         u8         pib_attribute_index;
 459         u8         pib_attribute_length;
 460         u8         pib_attribute_value[MAX_ATTRIBUTE_SIZE];
 461 };
 462
 463 struct hwme_set_request_pset {
 464         u8         hw_attribute;
 465         u8         hw_attribute_length;
 466         u8         hw_attribute_value[MAX_HWME_ATTRIBUTE_SIZE];
 467 };
 468
 469 struct hwme_get_request_pset {
 470         u8         hw_attribute;
 471 };
 472
 473 struct tdme_setsfr_request_pset {
 474         u8         sfr_page;
 475         u8         sfr_address;
 476         u8         sfr_value;
 477 };
 478
 479 /* uplink functions parameter set definitions */
 480 struct hwme_set_confirm_pset {
 481         u8         status;
 482         u8         hw_attribute;
 483 };
 484
 485 struct hwme_get_confirm_pset {
 486         u8         status;
 487         u8         hw_attribute;
 488         u8         hw_attribute_length;
 489         u8         hw_attribute_value[MAX_HWME_ATTRIBUTE_SIZE];
 490 };
 491
 492 struct tdme_setsfr_confirm_pset {
 493         u8         status;
 494         u8         sfr_page;
 495         u8         sfr_address;
 496 };
 497
 498 struct mac_message {
 499         u8      command_id;
 500         u8      length;
 501         union {
 502                 struct mcps_data_request_pset       data_req;
 503                 struct mlme_set_request_pset        set_req;
 504                 struct hwme_set_request_pset        hwme_set_req;
 505                 struct hwme_get_request_pset        hwme_get_req;
 506                 struct tdme_setsfr_request_pset     tdme_set_sfr_req;
 507                 struct hwme_set_confirm_pset        hwme_set_cnf;
 508                 struct hwme_get_confirm_pset        hwme_get_cnf;
 509                 struct tdme_setsfr_confirm_pset     tdme_set_sfr_cnf;
 510                 u8                                  u8param;
 511                 u8                                  status;
 512                 u8                                  payload[148];
 513         } pdata;
 514 };
 515
 516 union pa_cfg_sfr {
 517         struct {
 518                 u8 bias_current_trim     : 3;
 519                 u8 /* reserved */        : 1;
 520                 u8 buffer_capacitor_trim : 3;
 521                 u8 boost                 : 1;
 522         };
 523         u8 paib;
 524 };
 525
 526 struct preamble_cfg_sfr {
 527         u8 timeout_symbols      : 3;
 528         u8 acquisition_symbols  : 3;
 529         u8 search_symbols       : 2;
 530 };
 531
 532 static int (*cascoda_api_upstream)(
 533         const u8 *buf,
 534         size_t len,
 535         void *device_ref
 536 );
 537
 538 /**
 539  * link_to_linux_err() - Translates an 802.15.4 return code into the closest
 540  *                       linux error
 541  * @link_status:  802.15.4 status code
 542  *
 543  * Return: 0 or Linux error code
 544  */
 545 static int link_to_linux_err(int link_status)
 546 {
 547         if (link_status < 0) {
 548                 /* status is already a Linux code */
 549                 return link_status;
 550         }
 551         switch (link_status) {
 552         case MAC_SUCCESS:
 553         case MAC_REALIGNMENT:
 554                 return 0;
 555         case MAC_IMPROPER_KEY_TYPE:
 556                 return -EKEYREJECTED;
 557         case MAC_IMPROPER_SECURITY_LEVEL:
 558         case MAC_UNSUPPORTED_LEGACY:
 559         case MAC_DENIED:
 560                 return -EACCES;
 561         case MAC_BEACON_LOST:
 562         case MAC_NO_ACK:
 563         case MAC_NO_BEACON:
 564                 return -ENETUNREACH;
 565         case MAC_CHANNEL_ACCESS_FAILURE:
 566         case MAC_TX_ACTIVE:
 567         case MAC_SCAN_IN_PROGRESS:
 568                 return -EBUSY;
 569         case MAC_DISABLE_TRX_FAILURE:
 570         case MAC_OUT_OF_CAP:
 571                 return -EAGAIN;
 572         case MAC_FRAME_TOO_LONG:
 573                 return -EMSGSIZE;
 574         case MAC_INVALID_GTS:
 575         case MAC_PAST_TIME:
 576                 return -EBADSLT;
 577         case MAC_INVALID_HANDLE:
 578                 return -EBADMSG;
 579         case MAC_INVALID_PARAMETER:
 580         case MAC_UNSUPPORTED_ATTRIBUTE:
 581         case MAC_ON_TIME_TOO_LONG:
 582         case MAC_INVALID_INDEX:
 583                 return -EINVAL;
 584         case MAC_NO_DATA:
 585                 return -ENODATA;
 586         case MAC_NO_SHORT_ADDRESS:
 587                 return -EFAULT;
 588         case MAC_PAN_ID_CONFLICT:
 589                 return -EADDRINUSE;
 590         case MAC_TRANSACTION_EXPIRED:
 591                 return -ETIME;
 592         case MAC_TRANSACTION_OVERFLOW:
 593                 return -ENOBUFS;
 594         case MAC_UNAVAILABLE_KEY:
 595                 return -ENOKEY;
 596         case MAC_INVALID_ADDRESS:
 597                 return -ENXIO;
 598         case MAC_TRACKING_OFF:
 599         case MAC_SUPERFRAME_OVERLAP:
 600                 return -EREMOTEIO;
 601         case MAC_LIMIT_REACHED:
 602                 return -EDQUOT;
 603         case MAC_READ_ONLY:
 604                 return -EROFS;
 605         default:
 606                 return -EPROTO;
 607         }
 608 }
 609
 610 /**
 611  * ca8210_test_int_driver_write() - Writes a message to the test interface to be
 612  *                                  read by the userspace
 613  * @buf:  Buffer containing upstream message
 614  * @len:  length of message to write
 615  * @spi:  SPI device of message originator
 616  *
 617  * Return: 0 or linux error code
 618  */
 619 static int ca8210_test_int_driver_write(
 620         const u8       *buf,
 621         size_t          len,
 622         void           *spi
 623 )
 624 {
 625         struct ca8210_priv *priv = spi_get_drvdata(spi);
 626         struct ca8210_test *test = &priv->test;
 627         char *fifo_buffer;
 628         int i;
 629
 630         dev_dbg(
 631                 &priv->spi->dev,
 632                 "test_interface: Buffering upstream message:\n"
 633         );
 634         for (i = 0; i < len; i++)
 635                 dev_dbg(&priv->spi->dev, "%#03x\n", buf[i]);
 636
 637         fifo_buffer = kmalloc(len, GFP_KERNEL);
 638         if (!fifo_buffer)
 639                 return -ENOMEM;
 640         memcpy(fifo_buffer, buf, len);
 641         kfifo_in(&test->up_fifo, &fifo_buffer, 4);
 642         wake_up_interruptible(&priv->test.readq);
 643
 644         return 0;
 645 }
 646
 647 /* SPI Operation */
 648
 649 static int ca8210_net_rx(
 650         struct ieee802154_hw  *hw,
 651         u8                    *command,
 652         size_t                 len
 653 );
 654 static u8 mlme_reset_request_sync(
 655         u8       set_default_pib,
 656         void    *device_ref
 657 );
 658 static int ca8210_spi_transfer(
 659         struct spi_device *spi,
 660         const u8          *buf,
 661         size_t             len
 662 );
 663
 664 /**
 665  * ca8210_reset_send() - Hard resets the ca8210 for a given time
 666  * @spi:  Pointer to target ca8210 spi device
 667  * @ms:   Milliseconds to hold the reset line low for
 668  */
 669 static void ca8210_reset_send(struct spi_device *spi, unsigned int ms)
 670 {
 671         struct ca8210_platform_data *pdata = spi->dev.platform_data;
 672         struct ca8210_priv *priv = spi_get_drvdata(spi);
 673         long status;
 674
 675         gpio_set_value(pdata->gpio_reset, 0);
 676         reinit_completion(&priv->ca8210_is_awake);
 677         msleep(ms);
 678         gpio_set_value(pdata->gpio_reset, 1);
 679         priv->promiscuous = false;
 680
 681         /* Wait until wakeup indication seen */
 682         status = wait_for_completion_interruptible_timeout(
 683                 &priv->ca8210_is_awake,
 684                 msecs_to_jiffies(CA8210_SYNC_TIMEOUT)
 685         );
 686         if (status == 0) {
 687                 dev_crit(
 688                         &spi->dev,
 689                         "Fatal: No wakeup from ca8210 after reset!\n"
 690                 );
 691         }
 692
 693         dev_dbg(&spi->dev, "Reset the device\n");
 694 }
 695
 696 /**
 697  * ca8210_mlme_reset_worker() - Resets the MLME, Called when the MAC OVERFLOW
 698  *                              condition happens.
 699  * @work:  Pointer to work being executed
 700  */
 701 static void ca8210_mlme_reset_worker(struct work_struct *work)
 702 {
 703         struct work_priv_container *wpc = container_of(
 704                 work,
 705                 struct work_priv_container,
 706                 work
 707         );
 708         struct ca8210_priv *priv = wpc->priv;
 709
 710         mlme_reset_request_sync(0, priv->spi);
 711         kfree(wpc);
 712 }
 713
 714 /**
 715  * ca8210_rx_done() - Calls various message dispatches responding to a received
 716  *                    command
 717  * @arg:  Pointer to the cas_control object for the relevant spi transfer
 718  *
 719  * Presents a received SAP command from the ca8210 to the Cascoda EVBME, test
 720  * interface and network driver.
 721  */
 722 static void ca8210_rx_done(struct cas_control *cas_ctl)
 723 {
 724         u8 *buf;
 725         u8 len;
 726         struct work_priv_container *mlme_reset_wpc;
 727         struct ca8210_priv *priv = cas_ctl->priv;
 728
 729         buf = cas_ctl->tx_in_buf;
 730         len = buf[1] + 2;
 731         if (len > CA8210_SPI_BUF_SIZE) {
 732                 dev_crit(
 733                         &priv->spi->dev,
 734                         "Received packet len (%d) erroneously long\n",
 735                         len
 736                 );
 737                 goto finish;
 738         }
 739
 740         if (buf[0] & SPI_SYN) {
 741                 if (priv->sync_command_response) {
 742                         memcpy(priv->sync_command_response, buf, len);
 743                         complete(&priv->sync_exchange_complete);
 744                 } else {
 745                         if (cascoda_api_upstream)
 746                                 cascoda_api_upstream(buf, len, priv->spi);
 747                         priv->sync_up++;
 748                 }
 749         } else {
 750                 if (cascoda_api_upstream)
 751                         cascoda_api_upstream(buf, len, priv->spi);
 752         }
 753
 754         ca8210_net_rx(priv->hw, buf, len);
 755         if (buf[0] == SPI_MCPS_DATA_CONFIRM) {
 756                 if (buf[3] == MAC_TRANSACTION_OVERFLOW) {
 757                         dev_info(
 758                                 &priv->spi->dev,
 759                                 "Waiting for transaction overflow to stabilise...\n");
 760                         msleep(2000);
 761                         dev_info(
 762                                 &priv->spi->dev,
 763                                 "Resetting MAC...\n");
 764
 765                         mlme_reset_wpc = kmalloc(sizeof(*mlme_reset_wpc),
 766                                                  GFP_KERNEL);
 767                         if (!mlme_reset_wpc)
 768                                 goto finish;
 769                         INIT_WORK(
 770                                 &mlme_reset_wpc->work,
 771                                 ca8210_mlme_reset_worker
 772                         );
 773                         mlme_reset_wpc->priv = priv;
 774                         queue_work(priv->mlme_workqueue, &mlme_reset_wpc->work);
 775                 }
 776         } else if (buf[0] == SPI_HWME_WAKEUP_INDICATION) {
 777                 dev_notice(
 778                         &priv->spi->dev,
 779                         "Wakeup indication received, reason:\n"
 780                 );
 781                 switch (buf[2]) {
 782                 case 0:
 783                         dev_notice(
 784                                 &priv->spi->dev,
 785                                 "Transceiver woken up from Power Up / System Reset\n"
 786                         );
 787                         break;
 788                 case 1:
 789                         dev_notice(
 790                                 &priv->spi->dev,
 791                                 "Watchdog Timer Time-Out\n"
 792                         );
 793                         break;
 794                 case 2:
 795                         dev_notice(
 796                                 &priv->spi->dev,
 797                                 "Transceiver woken up from Power-Off by Sleep Timer Time-Out\n");
 798                         break;
 799                 case 3:
 800                         dev_notice(
 801                                 &priv->spi->dev,
 802                                 "Transceiver woken up from Power-Off by GPIO Activity\n"
 803                         );
 804                         break;
 805                 case 4:
 806                         dev_notice(
 807                                 &priv->spi->dev,
 808                                 "Transceiver woken up from Standby by Sleep Timer Time-Out\n"
 809                         );
 810                         break;
 811                 case 5:
 812                         dev_notice(
 813                                 &priv->spi->dev,
 814                                 "Transceiver woken up from Standby by GPIO Activity\n"
 815                         );
 816                         break;
 817                 case 6:
 818                         dev_notice(
 819                                 &priv->spi->dev,
 820                                 "Sleep-Timer Time-Out in Active Mode\n"
 821                         );
 822                         break;
 823                 default:
 824                         dev_warn(&priv->spi->dev, "Wakeup reason unknown\n");
 825                         break;
 826                 }
 827                 complete(&priv->ca8210_is_awake);
 828         }
 829
 830 finish:;
 831 }
 832
 833 static int ca8210_remove(struct spi_device *spi_device);
 834
 835 /**
 836  * ca8210_spi_transfer_complete() - Called when a single spi transfer has
 837  *                                  completed
 838  * @context:  Pointer to the cas_control object for the finished transfer
 839  */
 840 static void ca8210_spi_transfer_complete(void *context)
 841 {
 842         struct cas_control *cas_ctl = context;
 843         struct ca8210_priv *priv = cas_ctl->priv;
 844         bool duplex_rx = false;
 845         int i;
 846         u8 retry_buffer[CA8210_SPI_BUF_SIZE];
 847
 848         if (
 849                 cas_ctl->tx_in_buf[0] == SPI_NACK ||
 850                 (cas_ctl->tx_in_buf[0] == SPI_IDLE &&
 851                 cas_ctl->tx_in_buf[1] == SPI_NACK)
 852         ) {
 853                 /* ca8210 is busy */
 854                 dev_info(&priv->spi->dev, "ca8210 was busy during attempted write\n");
 855                 if (cas_ctl->tx_buf[0] == SPI_IDLE) {
 856                         dev_warn(
 857                                 &priv->spi->dev,
 858                                 "IRQ servicing NACKd, dropping transfer\n"
 859                         );
 860                         kfree(cas_ctl);
 861                         return;
 862                 }
 863                 if (priv->retries > 3) {
 864                         dev_err(&priv->spi->dev, "too many retries!\n");
 865                         kfree(cas_ctl);
 866                         ca8210_remove(priv->spi);
 867                         return;
 868                 }
 869                 memcpy(retry_buffer, cas_ctl->tx_buf, CA8210_SPI_BUF_SIZE);
 870                 kfree(cas_ctl);
 871                 ca8210_spi_transfer(
 872                         priv->spi,
 873                         retry_buffer,
 874                         CA8210_SPI_BUF_SIZE
 875                 );
 876                 priv->retries++;
 877                 dev_info(&priv->spi->dev, "retried spi write\n");
 878                 return;
 879         } else if (
 880                         cas_ctl->tx_in_buf[0] != SPI_IDLE &&
 881                         cas_ctl->tx_in_buf[0] != SPI_NACK
 882                 ) {
 883                 duplex_rx = true;
 884         }
 885
 886         if (duplex_rx) {
 887                 dev_dbg(&priv->spi->dev, "READ CMD DURING TX\n");
 888                 for (i = 0; i < cas_ctl->tx_in_buf[1] + 2; i++)
 889                         dev_dbg(
 890                                 &priv->spi->dev,
 891                                 "%#03x\n",
 892                                 cas_ctl->tx_in_buf[i]
 893                         );
 894                 ca8210_rx_done(cas_ctl);
 895         }
 896         complete(&priv->spi_transfer_complete);
 897         kfree(cas_ctl);
 898         priv->retries = 0;
 899 }
 900
 901 /**
 902  * ca8210_spi_transfer() - Initiate duplex spi transfer with ca8210
 903  * @spi: Pointer to spi device for transfer
 904  * @buf: Octet array to send
 905  * @len: length of the buffer being sent
 906  *
 907  * Return: 0 or linux error code
 908  */
 909 static int ca8210_spi_transfer(
 910         struct spi_device  *spi,
 911         const u8           *buf,
 912         size_t              len
 913 )
 914 {
 915         int i, status = 0;
 916         struct ca8210_priv *priv;
 917         struct cas_control *cas_ctl;
 918
 919         if (!spi) {
 920                 pr_crit("NULL spi device passed to %s\n", __func__);
 921                 return -ENODEV;
 922         }
 923
 924         priv = spi_get_drvdata(spi);
 925         reinit_completion(&priv->spi_transfer_complete);
 926
 927         dev_dbg(&spi->dev, "%s called\n", __func__);
 928
 929         cas_ctl = kmalloc(sizeof(*cas_ctl), GFP_ATOMIC);
 930         if (!cas_ctl)
 931                 return -ENOMEM;
 932
 933         cas_ctl->priv = priv;
 934         memset(cas_ctl->tx_buf, SPI_IDLE, CA8210_SPI_BUF_SIZE);
 935         memset(cas_ctl->tx_in_buf, SPI_IDLE, CA8210_SPI_BUF_SIZE);
 936         memcpy(cas_ctl->tx_buf, buf, len);
 937
 938         for (i = 0; i < len; i++)
 939                 dev_dbg(&spi->dev, "%#03x\n", cas_ctl->tx_buf[i]);
 940
 941         spi_message_init(&cas_ctl->msg);
 942
 943         cas_ctl->transfer.tx_nbits = 1; /* 1 MOSI line */
 944         cas_ctl->transfer.rx_nbits = 1; /* 1 MISO line */
 945         cas_ctl->transfer.speed_hz = 0; /* Use device setting */
 946         cas_ctl->transfer.bits_per_word = 0; /* Use device setting */
 947         cas_ctl->transfer.tx_buf = cas_ctl->tx_buf;
 948         cas_ctl->transfer.rx_buf = cas_ctl->tx_in_buf;
 949         cas_ctl->transfer.delay_usecs = 0;
 950         cas_ctl->transfer.cs_change = 0;
 951         cas_ctl->transfer.len = sizeof(struct mac_message);
 952         cas_ctl->msg.complete = ca8210_spi_transfer_complete;
 953         cas_ctl->msg.context = cas_ctl;
 954
 955         spi_message_add_tail(
 956                 &cas_ctl->transfer,
 957                 &cas_ctl->msg
 958         );
 959
 960         status = spi_async(spi, &cas_ctl->msg);
 961         if (status < 0) {
 962                 dev_crit(
 963                         &spi->dev,
 964                         "status %d from spi_sync in write\n",
 965                         status
 966                 );
 967         }
 968
 969         return status;
 970 }
 971
 972 /**
 973  * ca8210_spi_exchange() - Exchange API/SAP commands with the radio
 974  * @buf:         Octet array of command being sent downstream
 975  * @len:         length of buf
 976  * @response:    buffer for storing synchronous response
 977  * @device_ref:  spi_device pointer for ca8210
 978  *
 979  * Effectively calls ca8210_spi_transfer to write buf[] to the spi, then for
 980  * synchronous commands waits for the corresponding response to be read from
 981  * the spi before returning. The response is written to the response parameter.
 982  *
 983  * Return: 0 or linux error code
 984  */
 985 static int ca8210_spi_exchange(
 986         const u8 *buf,
 987         size_t len,
 988         u8 *response,
 989         void *device_ref
 990 )
 991 {
 992         int status = 0;
 993         struct spi_device *spi = device_ref;
 994         struct ca8210_priv *priv = spi->dev.driver_data;
 995         long wait_remaining;
 996
 997         if ((buf[0] & SPI_SYN) && response) { /* if sync wait for confirm */
 998                 reinit_completion(&priv->sync_exchange_complete);
 999                 priv->sync_command_response = response;
1000         }
1001
1002         do {
1003                 reinit_completion(&priv->spi_transfer_complete);
1004                 status = ca8210_spi_transfer(priv->spi, buf, len);
1005                 if (status) {
1006                         dev_warn(
1007                                 &spi->dev,
1008                                 "spi write failed, returned %d\n",
1009                                 status
1010                         );
1011                         if (status == -EBUSY)
1012                                 continue;
1013                         if (((buf[0] & SPI_SYN) && response))
1014                                 complete(&priv->sync_exchange_complete);
1015                         goto cleanup;
1016                 }
1017
1018                 wait_remaining = wait_for_completion_interruptible_timeout(
1019                         &priv->spi_transfer_complete,
1020                         msecs_to_jiffies(1000)
1021                 );
1022                 if (wait_remaining == -ERESTARTSYS) {
1023                         status = -ERESTARTSYS;
1024                 } else if (wait_remaining == 0) {
1025                         dev_err(
1026                                 &spi->dev,
1027                                 "SPI downstream transfer timed out!\n"
1028                         );
1029                         status = -ETIME;
1030                         goto cleanup;
1031                 }
1032         } while (status < 0);
1033
1034         if (!((buf[0] & SPI_SYN) && response))
1035                 goto cleanup;
1036
1037         wait_remaining = wait_for_completion_interruptible_timeout(
1038                 &priv->sync_exchange_complete,
1039                 msecs_to_jiffies(CA8210_SYNC_TIMEOUT)
1040         );
1041         if (wait_remaining == -ERESTARTSYS) {
1042                 status = -ERESTARTSYS;
1043         } else if (wait_remaining == 0) {
1044                 dev_err(
1045                         &spi->dev,
1046                         "Synchronous confirm timeout\n"
1047                 );
1048                 status = -ETIME;
1049         }
1050
1051 cleanup:
1052         priv->sync_command_response = NULL;
1053         return status;
1054 }
1055
1056 /**
1057  * ca8210_interrupt_handler() - Called when an irq is received from the ca8210
1058  * @irq:     Id of the irq being handled
1059  * @dev_id:  Pointer passed by the system, pointing to the ca8210's private data
1060  *
1061  * This function is called when the irq line from the ca8210 is asserted,
1062  * signifying that the ca8210 has a message to send upstream to us. Starts the
1063  * asynchronous spi read.
1064  *
1065  * Return: irq return code
1066  */
1067 static irqreturn_t ca8210_interrupt_handler(int irq, void *dev_id)
1068 {
1069         struct ca8210_priv *priv = dev_id;
1070         int status;
1071
1072         dev_dbg(&priv->spi->dev, "irq: Interrupt occurred\n");
1073         do {
1074                 status = ca8210_spi_transfer(priv->spi, NULL, 0);
1075                 if (status && (status != -EBUSY)) {
1076                         dev_warn(
1077                                 &priv->spi->dev,
1078                                 "spi read failed, returned %d\n",
1079                                 status
1080                         );
1081                 }
1082         } while (status == -EBUSY);
1083         return IRQ_HANDLED;
1084 }
1085
1086 static int (*cascoda_api_downstream)(
1087         const u8 *buf,
1088         size_t len,
1089         u8 *response,
1090         void *device_ref
1091 ) = ca8210_spi_exchange;
1092
1093 /* Cascoda API / 15.4 SAP Primitives */
1094
1095 /**
1096  * tdme_setsfr_request_sync() - TDME_SETSFR_request/confirm according to API
1097  * @sfr_page:    SFR Page
1098  * @sfr_address: SFR Address
1099  * @sfr_value:   SFR Value
1100  * @device_ref:  Nondescript pointer to target device
1101  *
1102  * Return: 802.15.4 status code of TDME-SETSFR.confirm
1103  */
1104 static u8 tdme_setsfr_request_sync(
1105         u8            sfr_page,
1106         u8            sfr_address,
1107         u8            sfr_value,
1108         void         *device_ref
1109 )
1110 {
1111         int ret;
1112         struct mac_message command, response;
1113         struct spi_device *spi = device_ref;
1114
1115         command.command_id = SPI_TDME_SETSFR_REQUEST;
1116         command.length = 3;
1117         command.pdata.tdme_set_sfr_req.sfr_page    = sfr_page;
1118         command.pdata.tdme_set_sfr_req.sfr_address = sfr_address;
1119         command.pdata.tdme_set_sfr_req.sfr_value   = sfr_value;
1120         response.command_id = SPI_IDLE;
1121         ret = cascoda_api_downstream(
1122                 &command.command_id,
1123                 command.length + 2,
1124                 &response.command_id,
1125                 device_ref
1126         );
1127         if (ret) {
1128                 dev_crit(&spi->dev, "cascoda_api_downstream returned %d", ret);
1129                 return MAC_SYSTEM_ERROR;
1130         }
1131
1132         if (response.command_id != SPI_TDME_SETSFR_CONFIRM) {
1133                 dev_crit(
1134                         &spi->dev,
1135                         "sync response to SPI_TDME_SETSFR_REQUEST was not SPI_TDME_SETSFR_CONFIRM, it was %d\n",
1136                         response.command_id
1137                 );
1138                 return MAC_SYSTEM_ERROR;
1139         }
1140
1141         return response.pdata.tdme_set_sfr_cnf.status;
1142 }
1143
1144 /**
1145  * tdme_chipinit() - TDME Chip Register Default Initialisation Macro
1146  * @device_ref: Nondescript pointer to target device
1147  *
1148  * Return: 802.15.4 status code of API calls
1149  */
1150 static u8 tdme_chipinit(void *device_ref)
1151 {
1152         u8 status = MAC_SUCCESS;
1153         u8 sfr_address;
1154         struct spi_device *spi = device_ref;
1155         struct preamble_cfg_sfr pre_cfg_value = {
1156                 .timeout_symbols     = 3,
1157                 .acquisition_symbols = 3,
1158                 .search_symbols      = 1,
1159         };
1160         /* LNA Gain Settings */
1161         status = tdme_setsfr_request_sync(
1162                 1, (sfr_address = CA8210_SFR_LNAGX40),
1163                 LNAGX40_DEFAULT_GAIN, device_ref);
1164         if (status)
1165                 goto finish;
1166         status = tdme_setsfr_request_sync(
1167                 1, (sfr_address = CA8210_SFR_LNAGX41),
1168                 LNAGX41_DEFAULT_GAIN, device_ref);
1169         if (status)
1170                 goto finish;
1171         status = tdme_setsfr_request_sync(
1172                 1, (sfr_address = CA8210_SFR_LNAGX42),
1173                 LNAGX42_DEFAULT_GAIN, device_ref);
1174         if (status)
1175                 goto finish;
1176         status = tdme_setsfr_request_sync(
1177                 1, (sfr_address = CA8210_SFR_LNAGX43),
1178                 LNAGX43_DEFAULT_GAIN, device_ref);
1179         if (status)
1180                 goto finish;
1181         status = tdme_setsfr_request_sync(
1182                 1, (sfr_address = CA8210_SFR_LNAGX44),
1183                 LNAGX44_DEFAULT_GAIN, device_ref);
1184         if (status)
1185                 goto finish;
1186         status = tdme_setsfr_request_sync(
1187                 1, (sfr_address = CA8210_SFR_LNAGX45),
1188                 LNAGX45_DEFAULT_GAIN, device_ref);
1189         if (status)
1190                 goto finish;
1191         status = tdme_setsfr_request_sync(
1192                 1, (sfr_address = CA8210_SFR_LNAGX46),
1193                 LNAGX46_DEFAULT_GAIN, device_ref);
1194         if (status)
1195                 goto finish;
1196         status = tdme_setsfr_request_sync(
1197                 1, (sfr_address = CA8210_SFR_LNAGX47),
1198                 LNAGX47_DEFAULT_GAIN, device_ref);
1199         if (status)
1200                 goto finish;
1201         /* Preamble Timing Config */
1202         status = tdme_setsfr_request_sync(
1203                 1, (sfr_address = CA8210_SFR_PRECFG),
1204                 *((u8 *)&pre_cfg_value), device_ref);
1205         if (status)
1206                 goto finish;
1207         /* Preamble Threshold High */
1208         status = tdme_setsfr_request_sync(
1209                 1, (sfr_address = CA8210_SFR_PTHRH),
1210                 PTHRH_DEFAULT_THRESHOLD, device_ref);
1211         if (status)
1212                 goto finish;
1213         /* Tx Output Power 8 dBm */
1214         status = tdme_setsfr_request_sync(
1215                 0, (sfr_address = CA8210_SFR_PACFGIB),
1216                 PACFGIB_DEFAULT_CURRENT, device_ref);
1217         if (status)
1218                 goto finish;
1219
1220 finish:
1221         if (status != MAC_SUCCESS) {
1222                 dev_err(
1223                         &spi->dev,
1224                         "failed to set sfr at %#03x, status = %#03x\n",
1225                         sfr_address,
1226                         status
1227                 );
1228         }
1229         return status;
1230 }
1231
1232 /**
1233  * tdme_channelinit() - TDME Channel Register Default Initialisation Macro (Tx)
1234  * @channel:    802.15.4 channel to initialise chip for
1235  * @device_ref: Nondescript pointer to target device
1236  *
1237  * Return: 802.15.4 status code of API calls
1238  */
1239 static u8 tdme_channelinit(u8 channel, void *device_ref)
1240 {
1241         /* Transceiver front-end local oscillator tx two-point calibration
1242          * value. Tuned for the hardware.
1243          */
1244         u8 txcalval;
1245
1246         if (channel >= 25)
1247                 txcalval = 0xA7;
1248         else if (channel >= 23)
1249                 txcalval = 0xA8;
1250         else if (channel >= 22)
1251                 txcalval = 0xA9;
1252         else if (channel >= 20)
1253                 txcalval = 0xAA;
1254         else if (channel >= 17)
1255                 txcalval = 0xAB;
1256         else if (channel >= 16)
1257                 txcalval = 0xAC;
1258         else if (channel >= 14)
1259                 txcalval = 0xAD;
1260         else if (channel >= 12)
1261                 txcalval = 0xAE;
1262         else
1263                 txcalval = 0xAF;
1264
1265         return tdme_setsfr_request_sync(
1266                 1,
1267                 CA8210_SFR_LOTXCAL,
1268                 txcalval,
1269                 device_ref
1270         );  /* LO Tx Cal */
1271 }
1272
1273 /**
1274  * tdme_checkpibattribute() - Checks Attribute Values that are not checked in
1275  *                            MAC
1276  * @pib_attribute:        Attribute Number
1277  * @pib_attribute_length: Attribute length
1278  * @pib_attribute_value:  Pointer to Attribute Value
1279  * @device_ref:           Nondescript pointer to target device
1280  *
1281  * Return: 802.15.4 status code of checks
1282  */
1283 static u8 tdme_checkpibattribute(
1284         u8            pib_attribute,
1285         u8            pib_attribute_length,
1286         const void   *pib_attribute_value
1287 )
1288 {
1289         u8 status = MAC_SUCCESS;
1290         u8 value;
1291
1292         value  = *((u8 *)pib_attribute_value);
1293
1294         switch (pib_attribute) {
1295         /* PHY */
1296         case PHY_TRANSMIT_POWER:
1297                 if (value > 0x3F)
1298                         status = MAC_INVALID_PARAMETER;
1299                 break;
1300         case PHY_CCA_MODE:
1301                 if (value > 0x03)
1302                         status = MAC_INVALID_PARAMETER;
1303                 break;
1304         /* MAC */
1305         case MAC_BATT_LIFE_EXT_PERIODS:
1306                 if (value < 6 || value > 41)
1307                         status = MAC_INVALID_PARAMETER;
1308                 break;
1309         case MAC_BEACON_PAYLOAD:
1310                 if (pib_attribute_length > MAX_BEACON_PAYLOAD_LENGTH)
1311                         status = MAC_INVALID_PARAMETER;
1312                 break;
1313         case MAC_BEACON_PAYLOAD_LENGTH:
1314                 if (value > MAX_BEACON_PAYLOAD_LENGTH)
1315                         status = MAC_INVALID_PARAMETER;
1316                 break;
1317         case MAC_BEACON_ORDER:
1318                 if (value > 15)
1319                         status = MAC_INVALID_PARAMETER;
1320                 break;
1321         case MAC_MAX_BE:
1322                 if (value < 3 || value > 8)
1323                         status = MAC_INVALID_PARAMETER;
1324                 break;
1325         case MAC_MAX_CSMA_BACKOFFS:
1326                 if (value > 5)
1327                         status = MAC_INVALID_PARAMETER;
1328                 break;
1329         case MAC_MAX_FRAME_RETRIES:
1330                 if (value > 7)
1331                         status = MAC_INVALID_PARAMETER;
1332                 break;
1333         case MAC_MIN_BE:
1334                 if (value > 8)
1335                         status = MAC_INVALID_PARAMETER;
1336                 break;
1337         case MAC_RESPONSE_WAIT_TIME:
1338                 if (value < 2 || value > 64)
1339                         status = MAC_INVALID_PARAMETER;
1340                 break;
1341         case MAC_SUPERFRAME_ORDER:
1342                 if (value > 15)
1343                         status = MAC_INVALID_PARAMETER;
1344                 break;
1345         /* boolean */
1346         case MAC_ASSOCIATED_PAN_COORD:
1347         case MAC_ASSOCIATION_PERMIT:
1348         case MAC_AUTO_REQUEST:
1349         case MAC_BATT_LIFE_EXT:
1350         case MAC_GTS_PERMIT:
1351         case MAC_PROMISCUOUS_MODE:
1352         case MAC_RX_ON_WHEN_IDLE:
1353         case MAC_SECURITY_ENABLED:
1354                 if (value > 1)
1355                         status = MAC_INVALID_PARAMETER;
1356                 break;
1357         /* MAC SEC */
1358         case MAC_AUTO_REQUEST_SECURITY_LEVEL:
1359                 if (value > 7)
1360                         status = MAC_INVALID_PARAMETER;
1361                 break;
1362         case MAC_AUTO_REQUEST_KEY_ID_MODE:
1363                 if (value > 3)
1364                         status = MAC_INVALID_PARAMETER;
1365                 break;
1366         default:
1367                 break;
1368         }
1369
1370         return status;
1371 }
1372
1373 /**
1374  * tdme_settxpower() - Sets the tx power for MLME_SET phyTransmitPower
1375  * @txp:        Transmit Power
1376  * @device_ref: Nondescript pointer to target device
1377  *
1378  * Normalised to 802.15.4 Definition (6-bit, signed):
1379  * Bit 7-6: not used
1380  * Bit 5-0: tx power (-32 - +31 dB)
1381  *
1382  * Return: 802.15.4 status code of api calls
1383  */
1384 static u8 tdme_settxpower(u8 txp, void *device_ref)
1385 {
1386         u8 status;
1387         s8 txp_val;
1388         u8 txp_ext;
1389         union pa_cfg_sfr pa_cfg_val;
1390
1391         /* extend from 6 to 8 bit */
1392         txp_ext = 0x3F & txp;
1393         if (txp_ext & 0x20)
1394                 txp_ext += 0xC0;
1395         txp_val = (s8)txp_ext;
1396
1397         if (CA8210_MAC_MPW) {
1398                 if (txp_val > 0) {
1399                         /* 8 dBm: ptrim = 5, itrim = +3 => +4 dBm */
1400                         pa_cfg_val.bias_current_trim     = 3;
1401                         pa_cfg_val.buffer_capacitor_trim = 5;
1402                         pa_cfg_val.boost                 = 1;
1403                 } else {
1404                         /* 0 dBm: ptrim = 7, itrim = +3 => -6 dBm */
1405                         pa_cfg_val.bias_current_trim     = 3;
1406                         pa_cfg_val.buffer_capacitor_trim = 7;
1407                         pa_cfg_val.boost                 = 0;
1408                 }
1409                 /* write PACFG */
1410                 status = tdme_setsfr_request_sync(
1411                         0,
1412                         CA8210_SFR_PACFG,
1413                         pa_cfg_val.paib,
1414                         device_ref
1415                 );
1416         } else {
1417                 /* Look-Up Table for Setting Current and Frequency Trim values
1418                  * for desired Output Power
1419                  */
1420                 if (txp_val > 8) {
1421                         pa_cfg_val.paib = 0x3F;
1422                 } else if (txp_val == 8) {
1423                         pa_cfg_val.paib = 0x32;
1424                 } else if (txp_val == 7) {
1425                         pa_cfg_val.paib = 0x22;
1426                 } else if (txp_val == 6) {
1427                         pa_cfg_val.paib = 0x18;
1428                 } else if (txp_val == 5) {
1429                         pa_cfg_val.paib = 0x10;
1430                 } else if (txp_val == 4) {
1431                         pa_cfg_val.paib = 0x0C;
1432                 } else if (txp_val == 3) {
1433                         pa_cfg_val.paib = 0x08;
1434                 } else if (txp_val == 2) {
1435                         pa_cfg_val.paib = 0x05;
1436                 } else if (txp_val == 1) {
1437                         pa_cfg_val.paib = 0x03;
1438                 } else if (txp_val == 0) {
1439                         pa_cfg_val.paib = 0x01;
1440                 } else { /* < 0 */
1441                         pa_cfg_val.paib = 0x00;
1442                 }
1443                 /* write PACFGIB */
1444                 status = tdme_setsfr_request_sync(
1445                         0,
1446                         CA8210_SFR_PACFGIB,
1447                         pa_cfg_val.paib,
1448                         device_ref
1449                 );
1450         }
1451
1452         return status;
1453 }
1454
1455 /**
1456  * mcps_data_request() - mcps_data_request (Send Data) according to API Spec
1457  * @src_addr_mode:    Source Addressing Mode
1458  * @dst_address_mode: Destination Addressing Mode
1459  * @dst_pan_id:       Destination PAN ID
1460  * @dst_addr:         Pointer to Destination Address
1461  * @msdu_length:      length of Data
1462  * @msdu:             Pointer to Data
1463  * @msdu_handle:      Handle of Data
1464  * @tx_options:       Tx Options Bit Field
1465  * @security:         Pointer to Security Structure or NULL
1466  * @device_ref:       Nondescript pointer to target device
1467  *
1468  * Return: 802.15.4 status code of action
1469  */
1470 static u8 mcps_data_request(
1471         u8               src_addr_mode,
1472         u8               dst_address_mode,
1473         u16              dst_pan_id,
1474         union macaddr   *dst_addr,
1475         u8               msdu_length,
1476         u8              *msdu,
1477         u8               msdu_handle,
1478         u8               tx_options,
1479         struct secspec  *security,
1480         void            *device_ref
1481 )
1482 {
1483         struct secspec *psec;
1484         struct mac_message command;
1485
1486         command.command_id = SPI_MCPS_DATA_REQUEST;
1487         command.pdata.data_req.src_addr_mode = src_addr_mode;
1488         command.pdata.data_req.dst.mode = dst_address_mode;
1489         if (dst_address_mode != MAC_MODE_NO_ADDR) {
1490                 command.pdata.data_req.dst.pan_id[0] = LS_BYTE(dst_pan_id);
1491                 command.pdata.data_req.dst.pan_id[1] = MS_BYTE(dst_pan_id);
1492                 if (dst_address_mode == MAC_MODE_SHORT_ADDR) {
1493                         command.pdata.data_req.dst.address[0] = LS_BYTE(
1494                                 dst_addr->short_address
1495                         );
1496                         command.pdata.data_req.dst.address[1] = MS_BYTE(
1497                                 dst_addr->short_address
1498                         );
1499                 } else {   /* MAC_MODE_LONG_ADDR*/
1500                         memcpy(
1501                                 command.pdata.data_req.dst.address,
1502                                 dst_addr->ieee_address,
1503                                 8
1504                         );
1505                 }
1506         }
1507         command.pdata.data_req.msdu_length = msdu_length;
1508         command.pdata.data_req.msdu_handle = msdu_handle;
1509         command.pdata.data_req.tx_options = tx_options;
1510         memcpy(command.pdata.data_req.msdu, msdu, msdu_length);
1511         psec = (struct secspec *)(command.pdata.data_req.msdu + msdu_length);
1512         command.length = sizeof(struct mcps_data_request_pset) -
1513                 MAX_DATA_SIZE + msdu_length;
1514         if (!security || security->security_level == 0) {
1515                 psec->security_level = 0;
1516                 command.length += 1;
1517         } else {
1518                 *psec = *security;
1519                 command.length += sizeof(struct secspec);
1520         }
1521
1522         if (ca8210_spi_transfer(device_ref, &command.command_id,
1523                                 command.length + 2))
1524                 return MAC_SYSTEM_ERROR;
1525
1526         return MAC_SUCCESS;
1527 }
1528
1529 /**
1530  * mlme_reset_request_sync() - MLME_RESET_request/confirm according to API Spec
1531  * @set_default_pib: Set defaults in PIB
1532  * @device_ref:      Nondescript pointer to target device
1533  *
1534  * Return: 802.15.4 status code of MLME-RESET.confirm
1535  */
1536 static u8 mlme_reset_request_sync(
1537         u8    set_default_pib,
1538         void *device_ref
1539 )
1540 {
1541         u8 status;
1542         struct mac_message command, response;
1543         struct spi_device *spi = device_ref;
1544
1545         command.command_id = SPI_MLME_RESET_REQUEST;
1546         command.length = 1;
1547         command.pdata.u8param = set_default_pib;
1548
1549         if (cascoda_api_downstream(
1550                 &command.command_id,
1551                 command.length + 2,
1552                 &response.command_id,
1553                 device_ref)) {
1554                 dev_err(&spi->dev, "cascoda_api_downstream failed\n");
1555                 return MAC_SYSTEM_ERROR;
1556         }
1557
1558         if (response.command_id != SPI_MLME_RESET_CONFIRM)
1559                 return MAC_SYSTEM_ERROR;
1560
1561         status = response.pdata.status;
1562
1563         /* reset COORD Bit for Channel Filtering as Coordinator */
1564         if (CA8210_MAC_WORKAROUNDS && set_default_pib && !status) {
1565                 status = tdme_setsfr_request_sync(
1566                         0,
1567                         CA8210_SFR_MACCON,
1568                         0,
1569                         device_ref
1570                 );
1571         }
1572
1573         return status;
1574 }
1575
1576 /**
1577  * mlme_set_request_sync() - MLME_SET_request/confirm according to API Spec
1578  * @pib_attribute:        Attribute Number
1579  * @pib_attribute_index:  Index within Attribute if an Array
1580  * @pib_attribute_length: Attribute length
1581  * @pib_attribute_value:  Pointer to Attribute Value
1582  * @device_ref:           Nondescript pointer to target device
1583  *
1584  * Return: 802.15.4 status code of MLME-SET.confirm
1585  */
1586 static u8 mlme_set_request_sync(
1587         u8            pib_attribute,
1588         u8            pib_attribute_index,
1589         u8            pib_attribute_length,
1590         const void   *pib_attribute_value,
1591         void         *device_ref
1592 )
1593 {
1594         u8 status;
1595         struct mac_message command, response;
1596
1597         /* pre-check the validity of pib_attribute values that are not checked
1598          * in MAC
1599          */
1600         if (tdme_checkpibattribute(
1601                 pib_attribute, pib_attribute_length, pib_attribute_value)) {
1602                 return MAC_INVALID_PARAMETER;
1603         }
1604
1605         if (pib_attribute == PHY_CURRENT_CHANNEL) {
1606                 status = tdme_channelinit(
1607                         *((u8 *)pib_attribute_value),
1608                         device_ref
1609                 );
1610                 if (status)
1611                         return status;
1612         }
1613
1614         if (pib_attribute == PHY_TRANSMIT_POWER) {
1615                 return tdme_settxpower(
1616                         *((u8 *)pib_attribute_value),
1617                         device_ref
1618                 );
1619         }
1620
1621         command.command_id = SPI_MLME_SET_REQUEST;
1622         command.length = sizeof(struct mlme_set_request_pset) -
1623                 MAX_ATTRIBUTE_SIZE + pib_attribute_length;
1624         command.pdata.set_req.pib_attribute = pib_attribute;
1625         command.pdata.set_req.pib_attribute_index = pib_attribute_index;
1626         command.pdata.set_req.pib_attribute_length = pib_attribute_length;
1627         memcpy(
1628                 command.pdata.set_req.pib_attribute_value,
1629                 pib_attribute_value,
1630                 pib_attribute_length
1631         );
1632
1633         if (cascoda_api_downstream(
1634                 &command.command_id,
1635                 command.length + 2,
1636                 &response.command_id,
1637                 device_ref)) {
1638                 return MAC_SYSTEM_ERROR;
1639         }
1640
1641         if (response.command_id != SPI_MLME_SET_CONFIRM)
1642                 return MAC_SYSTEM_ERROR;
1643
1644         return response.pdata.status;
1645 }
1646
1647 /**
1648  * hwme_set_request_sync() - HWME_SET_request/confirm according to API Spec
1649  * @hw_attribute:        Attribute Number
1650  * @hw_attribute_length: Attribute length
1651  * @hw_attribute_value:  Pointer to Attribute Value
1652  * @device_ref:          Nondescript pointer to target device
1653  *
1654  * Return: 802.15.4 status code of HWME-SET.confirm
1655  */
1656 static u8 hwme_set_request_sync(
1657         u8           hw_attribute,
1658         u8           hw_attribute_length,
1659         u8          *hw_attribute_value,
1660         void        *device_ref
1661 )
1662 {
1663         struct mac_message command, response;
1664
1665         command.command_id = SPI_HWME_SET_REQUEST;
1666         command.length = 2 + hw_attribute_length;
1667         command.pdata.hwme_set_req.hw_attribute = hw_attribute;
1668         command.pdata.hwme_set_req.hw_attribute_length = hw_attribute_length;
1669         memcpy(
1670                 command.pdata.hwme_set_req.hw_attribute_value,
1671                 hw_attribute_value,
1672                 hw_attribute_length
1673         );
1674
1675         if (cascoda_api_downstream(
1676                 &command.command_id,
1677                 command.length + 2,
1678                 &response.command_id,
1679                 device_ref)) {
1680                 return MAC_SYSTEM_ERROR;
1681         }
1682
1683         if (response.command_id != SPI_HWME_SET_CONFIRM)
1684                 return MAC_SYSTEM_ERROR;
1685
1686         return response.pdata.hwme_set_cnf.status;
1687 }
1688
1689 /**
1690  * hwme_get_request_sync() - HWME_GET_request/confirm according to API Spec
1691  * @hw_attribute:        Attribute Number
1692  * @hw_attribute_length: Attribute length
1693  * @hw_attribute_value:  Pointer to Attribute Value
1694  * @device_ref:          Nondescript pointer to target device
1695  *
1696  * Return: 802.15.4 status code of HWME-GET.confirm
1697  */
1698 static u8 hwme_get_request_sync(
1699         u8           hw_attribute,
1700         u8          *hw_attribute_length,
1701         u8          *hw_attribute_value,
1702         void        *device_ref
1703 )
1704 {
1705         struct mac_message command, response;
1706
1707         command.command_id = SPI_HWME_GET_REQUEST;
1708         command.length = 1;
1709         command.pdata.hwme_get_req.hw_attribute = hw_attribute;
1710
1711         if (cascoda_api_downstream(
1712                 &command.command_id,
1713                 command.length + 2,
1714                 &response.command_id,
1715                 device_ref)) {
1716                 return MAC_SYSTEM_ERROR;
1717         }
1718
1719         if (response.command_id != SPI_HWME_GET_CONFIRM)
1720                 return MAC_SYSTEM_ERROR;
1721
1722         if (response.pdata.hwme_get_cnf.status == MAC_SUCCESS) {
1723                 *hw_attribute_length =
1724                         response.pdata.hwme_get_cnf.hw_attribute_length;
1725                 memcpy(
1726                         hw_attribute_value,
1727                         response.pdata.hwme_get_cnf.hw_attribute_value,
1728                         *hw_attribute_length
1729                 );
1730         }
1731
1732         return response.pdata.hwme_get_cnf.status;
1733 }
1734
1735 /* Network driver operation */
1736
1737 /**
1738  * ca8210_async_xmit_complete() - Called to announce that an asynchronous
1739  *                                transmission has finished
1740  * @hw:          ieee802154_hw of ca8210 that has finished exchange
1741  * @msduhandle:  Identifier of transmission that has completed
1742  * @status:      Returned 802.15.4 status code of the transmission
1743  *
1744  * Return: 0 or linux error code
1745  */
1746 static int ca8210_async_xmit_complete(
1747         struct ieee802154_hw  *hw,
1748         u8                     msduhandle,
1749         u8                     status)
1750 {
1751         struct ca8210_priv *priv = hw->priv;
1752
1753         if (priv->nextmsduhandle != msduhandle) {
1754                 dev_err(
1755                         &priv->spi->dev,
1756                         "Unexpected msdu_handle on data confirm, Expected %d, got %d\n",
1757                         priv->nextmsduhandle,
1758                         msduhandle
1759                 );
1760                 return -EIO;
1761         }
1762
1763         priv->async_tx_pending = false;
1764         priv->nextmsduhandle++;
1765
1766         if (status) {
1767                 dev_err(
1768                         &priv->spi->dev,
1769                         "Link transmission unsuccessful, status = %d\n",
1770                         status
1771                 );
1772                 if (status != MAC_TRANSACTION_OVERFLOW) {
1773                         ieee802154_wake_queue(priv->hw);
1774                         return 0;
1775                 }
1776         }
1777         ieee802154_xmit_complete(priv->hw, priv->tx_skb, true);
1778
1779         return 0;
1780 }
1781
1782 /**
1783  * ca8210_skb_rx() - Contructs a properly framed socket buffer from a received
1784  *                   MCPS_DATA_indication
1785  * @hw:        ieee802154_hw that MCPS_DATA_indication was received by
1786  * @len:       length of MCPS_DATA_indication
1787  * @data_ind:  Octet array of MCPS_DATA_indication
1788  *
1789  * Called by the spi driver whenever a SAP command is received, this function
1790  * will ascertain whether the command is of interest to the network driver and
1791  * take necessary action.
1792  *
1793  * Return: 0 or linux error code
1794  */
1795 static int ca8210_skb_rx(
1796         struct ieee802154_hw  *hw,
1797         size_t                 len,
1798         u8                    *data_ind
1799 )
1800 {
1801         struct ieee802154_hdr hdr;
1802         int msdulen;
1803         int hlen;
1804         u8 mpdulinkquality = data_ind[23];
1805         struct sk_buff *skb;
1806         struct ca8210_priv *priv = hw->priv;
1807
1808         /* Allocate mtu size buffer for every rx packet */
1809         skb = dev_alloc_skb(IEEE802154_MTU + sizeof(hdr));
1810         if (!skb)
1811                 return -ENOMEM;
1812
1813         skb_reserve(skb, sizeof(hdr));
1814
1815         msdulen = data_ind[22]; /* msdu_length */
1816         if (msdulen > IEEE802154_MTU) {
1817                 dev_err(
1818                         &priv->spi->dev,
1819                         "received erroneously large msdu length!\n"
1820                 );
1821                 kfree_skb(skb);
1822                 return -EMSGSIZE;
1823         }
1824         dev_dbg(&priv->spi->dev, "skb buffer length = %d\n", msdulen);
1825
1826         if (priv->promiscuous)
1827                 goto copy_payload;
1828
1829         /* Populate hdr */
1830         hdr.sec.level = data_ind[29 + msdulen];
1831         dev_dbg(&priv->spi->dev, "security level: %#03x\n", hdr.sec.level);
1832         if (hdr.sec.level > 0) {
1833                 hdr.sec.key_id_mode = data_ind[30 + msdulen];
1834                 memcpy(&hdr.sec.extended_src, &data_ind[31 + msdulen], 8);
1835                 hdr.sec.key_id = data_ind[39 + msdulen];
1836         }
1837         hdr.source.mode = data_ind[0];
1838         dev_dbg(&priv->spi->dev, "srcAddrMode: %#03x\n", hdr.source.mode);
1839         hdr.source.pan_id = *(u16 *)&data_ind[1];
1840         dev_dbg(&priv->spi->dev, "srcPanId: %#06x\n", hdr.source.pan_id);
1841         memcpy(&hdr.source.extended_addr, &data_ind[3], 8);
1842         hdr.dest.mode = data_ind[11];
1843         dev_dbg(&priv->spi->dev, "dstAddrMode: %#03x\n", hdr.dest.mode);
1844         hdr.dest.pan_id = *(u16 *)&data_ind[12];
1845         dev_dbg(&priv->spi->dev, "dstPanId: %#06x\n", hdr.dest.pan_id);
1846         memcpy(&hdr.dest.extended_addr, &data_ind[14], 8);
1847
1848         /* Fill in FC implicitly */
1849         hdr.fc.type = 1; /* Data frame */
1850         if (hdr.sec.level)
1851                 hdr.fc.security_enabled = 1;
1852         else
1853                 hdr.fc.security_enabled = 0;
1854         if (data_ind[1] != data_ind[12] || data_ind[2] != data_ind[13])
1855                 hdr.fc.intra_pan = 1;
1856         else
1857                 hdr.fc.intra_pan = 0;
1858         hdr.fc.dest_addr_mode = hdr.dest.mode;
1859         hdr.fc.source_addr_mode = hdr.source.mode;
1860
1861         /* Add hdr to front of buffer */
1862         hlen = ieee802154_hdr_push(skb, &hdr);
1863
1864         if (hlen < 0) {
1865                 dev_crit(&priv->spi->dev, "failed to push mac hdr onto skb!\n");
1866                 kfree_skb(skb);
1867                 return hlen;
1868         }
1869
1870         skb_reset_mac_header(skb);
1871         skb->mac_len = hlen;
1872
1873 copy_payload:
1874         /* Add <msdulen> bytes of space to the back of the buffer */
1875         /* Copy msdu to skb */
1876         skb_put_data(skb, &data_ind[29], msdulen);
1877
1878         ieee802154_rx_irqsafe(hw, skb, mpdulinkquality);
1879         return 0;
1880 }
1881
1882 /**
1883  * ca8210_net_rx() - Acts upon received SAP commands relevant to the network
1884  *                   driver
1885  * @hw:       ieee802154_hw that command was received by
1886  * @command:  Octet array of received command
1887  * @len:      length of the received command
1888  *
1889  * Called by the spi driver whenever a SAP command is received, this function
1890  * will ascertain whether the command is of interest to the network driver and
1891  * take necessary action.
1892  *
1893  * Return: 0 or linux error code
1894  */
1895 static int ca8210_net_rx(struct ieee802154_hw *hw, u8 *command, size_t len)
1896 {
1897         struct ca8210_priv *priv = hw->priv;
1898         unsigned long flags;
1899         u8 status;
1900
1901         dev_dbg(&priv->spi->dev, "%s: CmdID = %d\n", __func__, command[0]);
1902
1903         if (command[0] == SPI_MCPS_DATA_INDICATION) {
1904                 /* Received data */
1905                 spin_lock_irqsave(&priv->lock, flags);
1906                 if (command[26] == priv->last_dsn) {
1907                         dev_dbg(
1908                                 &priv->spi->dev,
1909                                 "DSN %d resend received, ignoring...\n",
1910                                 command[26]
1911                         );
1912                         spin_unlock_irqrestore(&priv->lock, flags);
1913                         return 0;
1914                 }
1915                 priv->last_dsn = command[26];
1916                 spin_unlock_irqrestore(&priv->lock, flags);
1917                 return ca8210_skb_rx(hw, len - 2, command + 2);
1918         } else if (command[0] == SPI_MCPS_DATA_CONFIRM) {
1919                 status = command[3];
1920                 if (priv->async_tx_pending) {
1921                         return ca8210_async_xmit_complete(
1922                                 hw,
1923                                 command[2],
1924                                 status
1925                         );
1926                 }
1927         }
1928
1929         return 0;
1930 }
1931
1932 /**
1933  * ca8210_skb_tx() - Transmits a given socket buffer using the ca8210
1934  * @skb:         Socket buffer to transmit
1935  * @msduhandle:  Data identifier to pass to the 802.15.4 MAC
1936  * @priv:        Pointer to private data section of target ca8210
1937  *
1938  * Return: 0 or linux error code
1939  */
1940 static int ca8210_skb_tx(
1941         struct sk_buff      *skb,
1942         u8                   msduhandle,
1943         struct ca8210_priv  *priv
1944 )
1945 {
1946         int status;
1947         struct ieee802154_hdr header = { };
1948         struct secspec secspec;
1949         unsigned int mac_len;
1950
1951         dev_dbg(&priv->spi->dev, "%s called\n", __func__);
1952
1953         /* Get addressing info from skb - ieee802154 layer creates a full
1954          * packet
1955          */
1956         mac_len = ieee802154_hdr_peek_addrs(skb, &header);
1957
1958         secspec.security_level = header.sec.level;
1959         secspec.key_id_mode = header.sec.key_id_mode;
1960         if (secspec.key_id_mode == 2)
1961                 memcpy(secspec.key_source, &header.sec.short_src, 4);
1962         else if (secspec.key_id_mode == 3)
1963                 memcpy(secspec.key_source, &header.sec.extended_src, 8);
1964         secspec.key_index = header.sec.key_id;
1965
1966         /* Pass to Cascoda API */
1967         status =  mcps_data_request(
1968                 header.source.mode,
1969                 header.dest.mode,
1970                 header.dest.pan_id,
1971                 (union macaddr *)&header.dest.extended_addr,
1972                 skb->len - mac_len,
1973                 &skb->data[mac_len],
1974                 msduhandle,
1975                 header.fc.ack_request,
1976                 &secspec,
1977                 priv->spi
1978         );
1979         return link_to_linux_err(status);
1980 }
1981
1982 /**
1983  * ca8210_start() - Starts the network driver
1984  * @hw:  ieee802154_hw of ca8210 being started
1985  *
1986  * Return: 0 or linux error code
1987  */
1988 static int ca8210_start(struct ieee802154_hw *hw)
1989 {
1990         int status;
1991         u8 rx_on_when_idle;
1992         u8 lqi_threshold = 0;
1993         struct ca8210_priv *priv = hw->priv;
1994
1995         priv->last_dsn = -1;
1996         /* Turn receiver on when idle for now just to test rx */
1997         rx_on_when_idle = 1;
1998         status = mlme_set_request_sync(
1999                 MAC_RX_ON_WHEN_IDLE,
2000                 0,
2001                 1,
2002                 &rx_on_when_idle,
2003                 priv->spi
2004         );
2005         if (status) {
2006                 dev_crit(
2007                         &priv->spi->dev,
2008                         "Setting rx_on_when_idle failed, status = %d\n",
2009                         status
2010                 );
2011                 return link_to_linux_err(status);
2012         }
2013         status = hwme_set_request_sync(
2014                 HWME_LQILIMIT,
2015                 1,
2016                 &lqi_threshold,
2017                 priv->spi
2018         );
2019         if (status) {
2020                 dev_crit(
2021                         &priv->spi->dev,
2022                         "Setting lqilimit failed, status = %d\n",
2023                         status
2024                 );
2025                 return link_to_linux_err(status);
2026         }
2027
2028         return 0;
2029 }
2030
2031 /**
2032  * ca8210_stop() - Stops the network driver
2033  * @hw:  ieee802154_hw of ca8210 being stopped
2034  *
2035  * Return: 0 or linux error code
2036  */
2037 static void ca8210_stop(struct ieee802154_hw *hw)
2038 {
2039 }
2040
2041 /**
2042  * ca8210_xmit_async() - Asynchronously transmits a given socket buffer using
2043  *                       the ca8210
2044  * @hw:   ieee802154_hw of ca8210 to transmit from
2045  * @skb:  Socket buffer to transmit
2046  *
2047  * Return: 0 or linux error code
2048  */
2049 static int ca8210_xmit_async(struct ieee802154_hw *hw, struct sk_buff *skb)
2050 {
2051         struct ca8210_priv *priv = hw->priv;
2052         int status;
2053
2054         dev_dbg(&priv->spi->dev, "calling %s\n", __func__);
2055
2056         priv->tx_skb = skb;
2057         priv->async_tx_pending = true;
2058         status = ca8210_skb_tx(skb, priv->nextmsduhandle, priv);
2059         return status;
2060 }
2061
2062 /**
2063  * ca8210_get_ed() - Returns the measured energy on the current channel at this
2064  *                   instant in time
2065  * @hw:     ieee802154_hw of target ca8210
2066  * @level:  Measured Energy Detect level
2067  *
2068  * Return: 0 or linux error code
2069  */
2070 static int ca8210_get_ed(struct ieee802154_hw *hw, u8 *level)
2071 {
2072         u8 lenvar;
2073         struct ca8210_priv *priv = hw->priv;
2074
2075         return link_to_linux_err(
2076                 hwme_get_request_sync(HWME_EDVALUE, &lenvar, level, priv->spi)
2077         );
2078 }
2079
2080 /**
2081  * ca8210_set_channel() - Sets the current operating 802.15.4 channel of the
2082  *                        ca8210
2083  * @hw:       ieee802154_hw of target ca8210
2084  * @page:     Channel page to set
2085  * @channel:  Channel number to set
2086  *
2087  * Return: 0 or linux error code
2088  */
2089 static int ca8210_set_channel(
2090         struct ieee802154_hw  *hw,
2091         u8                     page,
2092         u8                     channel
2093 )
2094 {
2095         u8 status;
2096         struct ca8210_priv *priv = hw->priv;
2097
2098         status = mlme_set_request_sync(
2099                 PHY_CURRENT_CHANNEL,
2100                 0,
2101                 1,
2102                 &channel,
2103                 priv->spi
2104         );
2105         if (status) {
2106                 dev_err(
2107                         &priv->spi->dev,
2108                         "error setting channel, MLME-SET.confirm status = %d\n",
2109                         status
2110                 );
2111         }
2112         return link_to_linux_err(status);
2113 }
2114
2115 /**
2116  * ca8210_set_hw_addr_filt() - Sets the address filtering parameters of the
2117  *                             ca8210
2118  * @hw:       ieee802154_hw of target ca8210
2119  * @filt:     Filtering parameters
2120  * @changed:  Bitmap representing which parameters to change
2121  *
2122  * Effectively just sets the actual addressing information identifying this node
2123  * as all filtering is performed by the ca8210 as detailed in the IEEE 802.15.4
2124  * 2006 specification.
2125  *
2126  * Return: 0 or linux error code
2127  */
2128 static int ca8210_set_hw_addr_filt(
2129         struct ieee802154_hw            *hw,
2130         struct ieee802154_hw_addr_filt  *filt,
2131         unsigned long                    changed
2132 )
2133 {
2134         u8 status = 0;
2135         struct ca8210_priv *priv = hw->priv;
2136
2137         if (changed & IEEE802154_AFILT_PANID_CHANGED) {
2138                 status = mlme_set_request_sync(
2139                         MAC_PAN_ID,
2140                         0,
2141                         2,
2142                         &filt->pan_id, priv->spi
2143                 );
2144                 if (status) {
2145                         dev_err(
2146                                 &priv->spi->dev,
2147                                 "error setting pan id, MLME-SET.confirm status = %d",
2148                                 status
2149                         );
2150                         return link_to_linux_err(status);
2151                 }
2152         }
2153         if (changed & IEEE802154_AFILT_SADDR_CHANGED) {
2154                 status = mlme_set_request_sync(
2155                         MAC_SHORT_ADDRESS,
2156                         0,
2157                         2,
2158                         &filt->short_addr, priv->spi
2159                 );
2160                 if (status) {
2161                         dev_err(
2162                                 &priv->spi->dev,
2163                                 "error setting short address, MLME-SET.confirm status = %d",
2164                                 status
2165                         );
2166                         return link_to_linux_err(status);
2167                 }
2168         }
2169         if (changed & IEEE802154_AFILT_IEEEADDR_CHANGED) {
2170                 status = mlme_set_request_sync(
2171                         NS_IEEE_ADDRESS,
2172                         0,
2173                         8,
2174                         &filt->ieee_addr,
2175                         priv->spi
2176                 );
2177                 if (status) {
2178                         dev_err(
2179                                 &priv->spi->dev,
2180                                 "error setting ieee address, MLME-SET.confirm status = %d",
2181                                 status
2182                         );
2183                         return link_to_linux_err(status);
2184                 }
2185         }
2186         /* TODO: Should use MLME_START to set coord bit? */
2187         return 0;
2188 }
2189
2190 /**
2191  * ca8210_set_tx_power() - Sets the transmit power of the ca8210
2192  * @hw:   ieee802154_hw of target ca8210
2193  * @mbm:  Transmit power in mBm (dBm*100)
2194  *
2195  * Return: 0 or linux error code
2196  */
2197 static int ca8210_set_tx_power(struct ieee802154_hw *hw, s32 mbm)
2198 {
2199         struct ca8210_priv *priv = hw->priv;
2200
2201         mbm /= 100;
2202         return link_to_linux_err(
2203                 mlme_set_request_sync(PHY_TRANSMIT_POWER, 0, 1, &mbm, priv->spi)
2204         );
2205 }
2206
2207 /**
2208  * ca8210_set_cca_mode() - Sets the clear channel assessment mode of the ca8210
2209  * @hw:   ieee802154_hw of target ca8210
2210  * @cca:  CCA mode to set
2211  *
2212  * Return: 0 or linux error code
2213  */
2214 static int ca8210_set_cca_mode(
2215         struct ieee802154_hw       *hw,
2216         const struct wpan_phy_cca  *cca
2217 )
2218 {
2219         u8 status;
2220         u8 cca_mode;
2221         struct ca8210_priv *priv = hw->priv;
2222
2223         cca_mode = cca->mode & 3;
2224         if (cca_mode == 3 && cca->opt == NL802154_CCA_OPT_ENERGY_CARRIER_OR) {
2225                 /* cca_mode 0 == CS OR ED, 3 == CS AND ED */
2226                 cca_mode = 0;
2227         }
2228         status = mlme_set_request_sync(
2229                 PHY_CCA_MODE,
2230                 0,
2231                 1,
2232                 &cca_mode,
2233                 priv->spi
2234         );
2235         if (status) {
2236                 dev_err(
2237                         &priv->spi->dev,
2238                         "error setting cca mode, MLME-SET.confirm status = %d",
2239                         status
2240                 );
2241         }
2242         return link_to_linux_err(status);
2243 }
2244
2245 /**
2246  * ca8210_set_cca_ed_level() - Sets the CCA ED level of the ca8210
2247  * @hw:     ieee802154_hw of target ca8210
2248  * @level:  ED level to set (in mbm)
2249  *
2250  * Sets the minimum threshold of measured energy above which the ca8210 will
2251  * back off and retry a transmission.
2252  *
2253  * Return: 0 or linux error code
2254  */
2255 static int ca8210_set_cca_ed_level(struct ieee802154_hw *hw, s32 level)
2256 {
2257         u8 status;
2258         u8 ed_threshold = (level / 100) * 2 + 256;
2259         struct ca8210_priv *priv = hw->priv;
2260
2261         status = hwme_set_request_sync(
2262                 HWME_EDTHRESHOLD,
2263                 1,
2264                 &ed_threshold,
2265                 priv->spi
2266         );
2267         if (status) {
2268                 dev_err(
2269                         &priv->spi->dev,
2270                         "error setting ed threshold, HWME-SET.confirm status = %d",
2271                         status
2272                 );
2273         }
2274         return link_to_linux_err(status);
2275 }
2276
2277 /**
2278  * ca8210_set_csma_params() - Sets the CSMA parameters of the ca8210
2279  * @hw:       ieee802154_hw of target ca8210
2280  * @min_be:   Minimum backoff exponent when backing off a transmission
2281  * @max_be:   Maximum backoff exponent when backing off a transmission
2282  * @retries:  Number of times to retry after backing off
2283  *
2284  * Return: 0 or linux error code
2285  */
2286 static int ca8210_set_csma_params(
2287         struct ieee802154_hw  *hw,
2288         u8                     min_be,
2289         u8                     max_be,
2290         u8                     retries
2291 )
2292 {
2293         u8 status;
2294         struct ca8210_priv *priv = hw->priv;
2295
2296         status = mlme_set_request_sync(MAC_MIN_BE, 0, 1, &min_be, priv->spi);
2297         if (status) {
2298                 dev_err(
2299                         &priv->spi->dev,
2300                         "error setting min be, MLME-SET.confirm status = %d",
2301                         status
2302                 );
2303                 return link_to_linux_err(status);
2304         }
2305         status = mlme_set_request_sync(MAC_MAX_BE, 0, 1, &max_be, priv->spi);
2306         if (status) {
2307                 dev_err(
2308                         &priv->spi->dev,
2309                         "error setting max be, MLME-SET.confirm status = %d",
2310                         status
2311                 );
2312                 return link_to_linux_err(status);
2313         }
2314         status = mlme_set_request_sync(
2315                 MAC_MAX_CSMA_BACKOFFS,
2316                 0,
2317                 1,
2318                 &retries,
2319                 priv->spi
2320         );
2321         if (status) {
2322                 dev_err(
2323                         &priv->spi->dev,
2324                         "error setting max csma backoffs, MLME-SET.confirm status = %d",
2325                         status
2326                 );
2327         }
2328         return link_to_linux_err(status);
2329 }
2330
2331 /**
2332  * ca8210_set_frame_retries() - Sets the maximum frame retries of the ca8210
2333  * @hw:       ieee802154_hw of target ca8210
2334  * @retries:  Number of retries
2335  *
2336  * Sets the number of times to retry a transmission if no acknowledgment was
2337  * was received from the other end when one was requested.
2338  *
2339  * Return: 0 or linux error code
2340  */
2341 static int ca8210_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
2342 {
2343         u8 status;
2344         struct ca8210_priv *priv = hw->priv;
2345
2346         status = mlme_set_request_sync(
2347                 MAC_MAX_FRAME_RETRIES,
2348                 0,
2349                 1,
2350                 &retries,
2351                 priv->spi
2352         );
2353         if (status) {
2354                 dev_err(
2355                         &priv->spi->dev,
2356                         "error setting frame retries, MLME-SET.confirm status = %d",
2357                         status
2358                 );
2359         }
2360         return link_to_linux_err(status);
2361 }
2362
2363 static int ca8210_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
2364 {
2365         u8 status;
2366         struct ca8210_priv *priv = hw->priv;
2367
2368         status = mlme_set_request_sync(
2369                 MAC_PROMISCUOUS_MODE,
2370                 0,
2371                 1,
2372                 (const void *)&on,
2373                 priv->spi
2374         );
2375         if (status) {
2376                 dev_err(
2377                         &priv->spi->dev,
2378                         "error setting promiscuous mode, MLME-SET.confirm status = %d",
2379                         status
2380                 );
2381         } else {
2382                 priv->promiscuous = on;
2383         }
2384         return link_to_linux_err(status);
2385 }
2386
2387 static const struct ieee802154_ops ca8210_phy_ops = {
2388         .start = ca8210_start,
2389         .stop = ca8210_stop,
2390         .xmit_async = ca8210_xmit_async,
2391         .ed = ca8210_get_ed,
2392         .set_channel = ca8210_set_channel,
2393         .set_hw_addr_filt = ca8210_set_hw_addr_filt,
2394         .set_txpower = ca8210_set_tx_power,
2395         .set_cca_mode = ca8210_set_cca_mode,
2396         .set_cca_ed_level = ca8210_set_cca_ed_level,
2397         .set_csma_params = ca8210_set_csma_params,
2398         .set_frame_retries = ca8210_set_frame_retries,
2399         .set_promiscuous_mode = ca8210_set_promiscuous_mode
2400 };
2401
2402 /* Test/EVBME Interface */
2403
2404 /**
2405  * ca8210_test_int_open() - Opens the test interface to the userspace
2406  * @inodp:  inode representation of file interface
2407  * @filp:   file interface
2408  *
2409  * Return: 0 or linux error code
2410  */
2411 static int ca8210_test_int_open(struct inode *inodp, struct file *filp)
2412 {
2413         struct ca8210_priv *priv = inodp->i_private;
2414
2415         filp->private_data = priv;
2416         return 0;
2417 }
2418
2419 /**
2420  * ca8210_test_check_upstream() - Checks a command received from the upstream
2421  *                                testing interface for required action
2422  * @buf:        Buffer containing command to check
2423  * @device_ref: Nondescript pointer to target device
2424  *
2425  * Return: 0 or linux error code
2426  */
2427 static int ca8210_test_check_upstream(u8 *buf, void *device_ref)
2428 {
2429         int ret;
2430         u8 response[CA8210_SPI_BUF_SIZE];
2431
2432         if (buf[0] == SPI_MLME_SET_REQUEST) {
2433                 ret = tdme_checkpibattribute(buf[2], buf[4], buf + 5);
2434                 if (ret) {
2435                         response[0]  = SPI_MLME_SET_CONFIRM;
2436                         response[1] = 3;
2437                         response[2] = MAC_INVALID_PARAMETER;
2438                         response[3] = buf[2];
2439                         response[4] = buf[3];
2440                         if (cascoda_api_upstream)
2441                                 cascoda_api_upstream(response, 5, device_ref);
2442                         return ret;
2443                 }
2444         }
2445         if (buf[0] == SPI_MLME_ASSOCIATE_REQUEST) {
2446                 return tdme_channelinit(buf[2], device_ref);
2447         } else if (buf[0] == SPI_MLME_START_REQUEST) {
2448                 return tdme_channelinit(buf[4], device_ref);
2449         } else if (
2450                 (buf[0] == SPI_MLME_SET_REQUEST) &&
2451                 (buf[2] == PHY_CURRENT_CHANNEL)
2452         ) {
2453                 return tdme_channelinit(buf[5], device_ref);
2454         } else if (
2455                 (buf[0] == SPI_TDME_SET_REQUEST) &&
2456                 (buf[2] == TDME_CHANNEL)
2457         ) {
2458                 return tdme_channelinit(buf[4], device_ref);
2459         } else if (
2460                 (CA8210_MAC_WORKAROUNDS) &&
2461                 (buf[0] == SPI_MLME_RESET_REQUEST) &&
2462                 (buf[2] == 1)
2463         ) {
2464                 /* reset COORD Bit for Channel Filtering as Coordinator */
2465                 return tdme_setsfr_request_sync(
2466                         0,
2467                         CA8210_SFR_MACCON,
2468                         0,
2469                         device_ref
2470                 );
2471         }
2472         return 0;
2473 } /* End of EVBMECheckSerialCommand() */
2474
2475 /**
2476  * ca8210_test_int_user_write() - Called by a process in userspace to send a
2477  *                                message to the ca8210 drivers
2478  * @filp:    file interface
2479  * @in_buf:  Buffer containing message to write
2480  * @len:     length of message
2481  * @off:     file offset
2482  *
2483  * Return: 0 or linux error code
2484  */
2485 static ssize_t ca8210_test_int_user_write(
2486         struct file        *filp,
2487         const char __user  *in_buf,
2488         size_t              len,
2489         loff_t             *off
2490 )
2491 {
2492         int ret;
2493         struct ca8210_priv *priv = filp->private_data;
2494         u8 command[CA8210_SPI_BUF_SIZE];
2495
2496         if (len > CA8210_SPI_BUF_SIZE) {
2497                 dev_warn(
2498                         &priv->spi->dev,
2499                         "userspace requested erroneously long write (%zu)\n",
2500                         len
2501                 );
2502                 return -EMSGSIZE;
2503         }
2504
2505         ret = copy_from_user(command, in_buf, len);
2506         if (ret) {
2507                 dev_err(
2508                         &priv->spi->dev,
2509                         "%d bytes could not be copied from userspace\n",
2510                         ret
2511                 );
2512                 return -EIO;
2513         }
2514
2515         ret = ca8210_test_check_upstream(command, priv->spi);
2516         if (ret == 0) {
2517                 ret = ca8210_spi_exchange(
2518                         command,
2519                         command[1] + 2,
2520                         NULL,
2521                         priv->spi
2522                 );
2523                 if (ret < 0) {
2524                         /* effectively 0 bytes were written successfully */
2525                         dev_err(
2526                                 &priv->spi->dev,
2527                                 "spi exchange failed\n"
2528                         );
2529                         return ret;
2530                 }
2531                 if (command[0] & SPI_SYN)
2532                         priv->sync_down++;
2533         }
2534
2535         return len;
2536 }
2537
2538 /**
2539  * ca8210_test_int_user_read() - Called by a process in userspace to read a
2540  *                               message from the ca8210 drivers
2541  * @filp:  file interface
2542  * @buf:   Buffer to write message to
2543  * @len:   length of message to read (ignored)
2544  * @offp:  file offset
2545  *
2546  * If the O_NONBLOCK flag was set when opening the file then this function will
2547  * not block, i.e. it will return if the fifo is empty. Otherwise the function
2548  * will block, i.e. wait until new data arrives.
2549  *
2550  * Return: number of bytes read
2551  */
2552 static ssize_t ca8210_test_int_user_read(
2553         struct file  *filp,
2554         char __user  *buf,
2555         size_t        len,
2556         loff_t       *offp
2557 )
2558 {
2559         int i, cmdlen;
2560         struct ca8210_priv *priv = filp->private_data;
2561         unsigned char *fifo_buffer;
2562         unsigned long bytes_not_copied;
2563
2564         if (filp->f_flags & O_NONBLOCK) {
2565                 /* Non-blocking mode */
2566                 if (kfifo_is_empty(&priv->test.up_fifo))
2567                         return 0;
2568         } else {
2569                 /* Blocking mode */
2570                 wait_event_interruptible(
2571                         priv->test.readq,
2572                         !kfifo_is_empty(&priv->test.up_fifo)
2573                 );
2574         }
2575
2576         if (kfifo_out(&priv->test.up_fifo, &fifo_buffer, 4) != 4) {
2577                 dev_err(
2578                         &priv->spi->dev,
2579                         "test_interface: Wrong number of elements popped from upstream fifo\n"
2580                 );
2581                 return 0;
2582         }
2583         cmdlen = fifo_buffer[1];
2584         bytes_not_copied = cmdlen + 2;
2585
2586         bytes_not_copied = copy_to_user(buf, fifo_buffer, bytes_not_copied);
2587         if (bytes_not_copied > 0) {
2588                 dev_err(
2589                         &priv->spi->dev,
2590                         "%lu bytes could not be copied to user space!\n",
2591                         bytes_not_copied
2592                 );
2593         }
2594
2595         dev_dbg(&priv->spi->dev, "test_interface: Cmd len = %d\n", cmdlen);
2596
2597         dev_dbg(&priv->spi->dev, "test_interface: Read\n");
2598         for (i = 0; i < cmdlen + 2; i++)
2599                 dev_dbg(&priv->spi->dev, "%#03x\n", fifo_buffer[i]);
2600
2601         kfree(fifo_buffer);
2602
2603         return cmdlen + 2;
2604 }
2605
2606 /**
2607  * ca8210_test_int_ioctl() - Called by a process in userspace to enact an
2608  *                           arbitrary action
2609  * @filp:        file interface
2610  * @ioctl_num:   which action to enact
2611  * @ioctl_param: arbitrary parameter for the action
2612  *
2613  * Return: status
2614  */
2615 static long ca8210_test_int_ioctl(
2616         struct file *filp,
2617         unsigned int ioctl_num,
2618         unsigned long ioctl_param
2619 )
2620 {
2621         struct ca8210_priv *priv = filp->private_data;
2622
2623         switch (ioctl_num) {
2624         case CA8210_IOCTL_HARD_RESET:
2625                 ca8210_reset_send(priv->spi, ioctl_param);
2626                 break;
2627         default:
2628                 break;
2629         }
2630         return 0;
2631 }
2632
2633 /**
2634  * ca8210_test_int_poll() - Called by a process in userspace to determine which
2635  *                          actions are currently possible for the file
2636  * @filp:   file interface
2637  * @ptable: poll table
2638  *
2639  * Return: set of poll return flags
2640  */
2641 static __poll_t ca8210_test_int_poll(
2642         struct file *filp,
2643         struct poll_table_struct *ptable
2644 )
2645 {
2646         __poll_t return_flags = 0;
2647         struct ca8210_priv *priv = filp->private_data;
2648
2649         poll_wait(filp, &priv->test.readq, ptable);
2650         if (!kfifo_is_empty(&priv->test.up_fifo))
2651                 return_flags |= (EPOLLIN | EPOLLRDNORM);
2652         if (wait_event_interruptible(
2653                 priv->test.readq,
2654                 !kfifo_is_empty(&priv->test.up_fifo))) {
2655                 return EPOLLERR;
2656         }
2657         return return_flags;
2658 }
2659
2660 static const struct file_operations test_int_fops = {
2661         .read =           ca8210_test_int_user_read,
2662         .write =          ca8210_test_int_user_write,
2663         .open =           ca8210_test_int_open,
2664         .release =        NULL,
2665         .unlocked_ioctl = ca8210_test_int_ioctl,
2666         .poll =           ca8210_test_int_poll
2667 };
2668
2669 /* Init/Deinit */
2670
2671 /**
2672  * ca8210_get_platform_data() - Populate a ca8210_platform_data object
2673  * @spi_device:  Pointer to ca8210 spi device object to get data for
2674  * @pdata:       Pointer to ca8210_platform_data object to populate
2675  *
2676  * Return: 0 or linux error code
2677  */
2678 static int ca8210_get_platform_data(
2679         struct spi_device *spi_device,
2680         struct ca8210_platform_data *pdata
2681 )
2682 {
2683         int ret = 0;
2684
2685         if (!spi_device->dev.of_node)
2686                 return -EINVAL;
2687
2688         pdata->extclockenable = of_property_read_bool(
2689                 spi_device->dev.of_node,
2690                 "extclock-enable"
2691         );
2692         if (pdata->extclockenable) {
2693                 ret = of_property_read_u32(
2694                         spi_device->dev.of_node,
2695                         "extclock-freq",
2696                         &pdata->extclockfreq
2697                 );
2698                 if (ret < 0)
2699                         return ret;
2700
2701                 ret = of_property_read_u32(
2702                         spi_device->dev.of_node,
2703                         "extclock-gpio",
2704                         &pdata->extclockgpio
2705                 );
2706         }
2707
2708         return ret;
2709 }
2710
2711 /**
2712  * ca8210_config_extern_clk() - Configure the external clock provided by the
2713  *                              ca8210
2714  * @pdata:  Pointer to ca8210_platform_data containing clock parameters
2715  * @spi:    Pointer to target ca8210 spi device
2716  * @on:     True to turn the clock on, false to turn off
2717  *
2718  * The external clock is configured with a frequency and output pin taken from
2719  * the platform data.
2720  *
2721  * Return: 0 or linux error code
2722  */
2723 static int ca8210_config_extern_clk(
2724         struct ca8210_platform_data *pdata,
2725         struct spi_device *spi,
2726         bool on
2727 )
2728 {
2729         u8 clkparam[2];
2730
2731         if (on) {
2732                 dev_info(&spi->dev, "Switching external clock on\n");
2733                 switch (pdata->extclockfreq) {
2734                 case SIXTEEN_MHZ:
2735                         clkparam[0] = 1;
2736                         break;
2737                 case EIGHT_MHZ:
2738                         clkparam[0] = 2;
2739                         break;
2740                 case FOUR_MHZ:
2741                         clkparam[0] = 3;
2742                         break;
2743                 case TWO_MHZ:
2744                         clkparam[0] = 4;
2745                         break;
2746                 case ONE_MHZ:
2747                         clkparam[0] = 5;
2748                         break;
2749                 default:
2750                         dev_crit(&spi->dev, "Invalid extclock-freq\n");
2751                         return -EINVAL;
2752                 }
2753                 clkparam[1] = pdata->extclockgpio;
2754         } else {
2755                 dev_info(&spi->dev, "Switching external clock off\n");
2756                 clkparam[0] = 0; /* off */
2757                 clkparam[1] = 0;
2758         }
2759         return link_to_linux_err(
2760                 hwme_set_request_sync(HWME_SYSCLKOUT, 2, clkparam, spi)
2761         );
2762 }
2763
2764 /**
2765  * ca8210_register_ext_clock() - Register ca8210's external clock with kernel
2766  * @spi:  Pointer to target ca8210 spi device
2767  *
2768  * Return: 0 or linux error code
2769  */
2770 static int ca8210_register_ext_clock(struct spi_device *spi)
2771 {
2772         struct device_node *np = spi->dev.of_node;
2773         struct ca8210_priv *priv = spi_get_drvdata(spi);
2774         struct ca8210_platform_data *pdata = spi->dev.platform_data;
2775         int ret = 0;
2776
2777         if (!np)
2778                 return -EFAULT;
2779
2780         priv->clk = clk_register_fixed_rate(
2781                 &spi->dev,
2782                 np->name,
2783                 NULL,
2784                 0,
2785                 pdata->extclockfreq
2786         );
2787
2788         if (IS_ERR(priv->clk)) {
2789                 dev_crit(&spi->dev, "Failed to register external clk\n");
2790                 return PTR_ERR(priv->clk);
2791         }
2792         ret = of_clk_add_provider(np, of_clk_src_simple_get, priv->clk);
2793         if (ret) {
2794                 clk_unregister(priv->clk);
2795                 dev_crit(
2796                         &spi->dev,
2797                         "Failed to register external clock as clock provider\n"
2798                 );
2799         } else {
2800                 dev_info(&spi->dev, "External clock set as clock provider\n");
2801         }
2802
2803         return ret;
2804 }
2805
2806 /**
2807  * ca8210_unregister_ext_clock() - Unregister ca8210's external clock with
2808  *                                 kernel
2809  * @spi:  Pointer to target ca8210 spi device
2810  */
2811 static void ca8210_unregister_ext_clock(struct spi_device *spi)
2812 {
2813         struct ca8210_priv *priv = spi_get_drvdata(spi);
2814
2815         if (!priv->clk)
2816                 return
2817
2818         of_clk_del_provider(spi->dev.of_node);
2819         clk_unregister(priv->clk);
2820         dev_info(&spi->dev, "External clock unregistered\n");
2821 }
2822
2823 /**
2824  * ca8210_reset_init() - Initialise the reset input to the ca8210
2825  * @spi:  Pointer to target ca8210 spi device
2826  *
2827  * Return: 0 or linux error code
2828  */
2829 static int ca8210_reset_init(struct spi_device *spi)
2830 {
2831         int ret;
2832         struct ca8210_platform_data *pdata = spi->dev.platform_data;
2833
2834         pdata->gpio_reset = of_get_named_gpio(
2835                 spi->dev.of_node,
2836                 "reset-gpio",
2837                 0
2838         );
2839
2840         ret = gpio_direction_output(pdata->gpio_reset, 1);
2841         if (ret < 0) {
2842                 dev_crit(
2843                         &spi->dev,
2844                         "Reset GPIO %d did not set to output mode\n",
2845                         pdata->gpio_reset
2846                 );
2847         }
2848
2849         return ret;
2850 }
2851
2852 /**
2853  * ca8210_interrupt_init() - Initialise the irq output from the ca8210
2854  * @spi:  Pointer to target ca8210 spi device
2855  *
2856  * Return: 0 or linux error code
2857  */
2858 static int ca8210_interrupt_init(struct spi_device *spi)
2859 {
2860         int ret;
2861         struct ca8210_platform_data *pdata = spi->dev.platform_data;
2862
2863         pdata->gpio_irq = of_get_named_gpio(
2864                 spi->dev.of_node,
2865                 "irq-gpio",
2866                 0
2867         );
2868
2869         pdata->irq_id = gpio_to_irq(pdata->gpio_irq);
2870         if (pdata->irq_id < 0) {
2871                 dev_crit(
2872                         &spi->dev,
2873                         "Could not get irq for gpio pin %d\n",
2874                         pdata->gpio_irq
2875                 );
2876                 gpio_free(pdata->gpio_irq);
2877                 return pdata->irq_id;
2878         }
2879
2880         ret = request_irq(
2881                 pdata->irq_id,
2882                 ca8210_interrupt_handler,
2883                 IRQF_TRIGGER_FALLING,
2884                 "ca8210-irq",
2885                 spi_get_drvdata(spi)
2886         );
2887         if (ret) {
2888                 dev_crit(&spi->dev, "request_irq %d failed\n", pdata->irq_id);
2889                 gpio_unexport(pdata->gpio_irq);
2890                 gpio_free(pdata->gpio_irq);
2891         }
2892
2893         return ret;
2894 }
2895
2896 /**
2897  * ca8210_dev_com_init() - Initialise the spi communication component
2898  * @priv:  Pointer to private data structure
2899  *
2900  * Return: 0 or linux error code
2901  */
2902 static int ca8210_dev_com_init(struct ca8210_priv *priv)
2903 {
2904         priv->mlme_workqueue = alloc_ordered_workqueue(
2905                 "MLME work queue",
2906                 WQ_UNBOUND
2907         );
2908         if (!priv->mlme_workqueue) {
2909                 dev_crit(&priv->spi->dev, "alloc of mlme_workqueue failed!\n");
2910                 return -ENOMEM;
2911         }
2912
2913         priv->irq_workqueue = alloc_ordered_workqueue(
2914                 "ca8210 irq worker",
2915                 WQ_UNBOUND
2916         );
2917         if (!priv->irq_workqueue) {
2918                 dev_crit(&priv->spi->dev, "alloc of irq_workqueue failed!\n");
2919                 return -ENOMEM;
2920         }
2921
2922         return 0;
2923 }
2924
2925 /**
2926  * ca8210_dev_com_clear() - Deinitialise the spi communication component
2927  * @priv:  Pointer to private data structure
2928  */
2929 static void ca8210_dev_com_clear(struct ca8210_priv *priv)
2930 {
2931         flush_workqueue(priv->mlme_workqueue);
2932         destroy_workqueue(priv->mlme_workqueue);
2933         flush_workqueue(priv->irq_workqueue);
2934         destroy_workqueue(priv->irq_workqueue);
2935 }
2936
2937 #define CA8210_MAX_TX_POWERS (9)
2938 static const s32 ca8210_tx_powers[CA8210_MAX_TX_POWERS] = {
2939         800, 700, 600, 500, 400, 300, 200, 100, 0
2940 };
2941
2942 #define CA8210_MAX_ED_LEVELS (21)
2943 static const s32 ca8210_ed_levels[CA8210_MAX_ED_LEVELS] = {
2944         -10300, -10250, -10200, -10150, -10100, -10050, -10000, -9950, -9900,
2945         -9850, -9800, -9750, -9700, -9650, -9600, -9550, -9500, -9450, -9400,
2946         -9350, -9300
2947 };
2948
2949 /**
2950  * ca8210_hw_setup() - Populate the ieee802154_hw phy attributes with the
2951  *                     ca8210's defaults
2952  * @ca8210_hw:  Pointer to ieee802154_hw to populate
2953  */
2954 static void ca8210_hw_setup(struct ieee802154_hw *ca8210_hw)
2955 {
2956         /* Support channels 11-26 */
2957         ca8210_hw->phy->supported.channels[0] = CA8210_VALID_CHANNELS;
2958         ca8210_hw->phy->supported.tx_powers_size = CA8210_MAX_TX_POWERS;
2959         ca8210_hw->phy->supported.tx_powers = ca8210_tx_powers;
2960         ca8210_hw->phy->supported.cca_ed_levels_size = CA8210_MAX_ED_LEVELS;
2961         ca8210_hw->phy->supported.cca_ed_levels = ca8210_ed_levels;
2962         ca8210_hw->phy->current_channel = 18;
2963         ca8210_hw->phy->current_page = 0;
2964         ca8210_hw->phy->transmit_power = 800;
2965         ca8210_hw->phy->cca.mode = NL802154_CCA_ENERGY_CARRIER;
2966         ca8210_hw->phy->cca.opt = NL802154_CCA_OPT_ENERGY_CARRIER_AND;
2967         ca8210_hw->phy->cca_ed_level = -9800;
2968         ca8210_hw->phy->symbol_duration = 16;
2969         ca8210_hw->phy->lifs_period = 40;
2970         ca8210_hw->phy->sifs_period = 12;
2971         ca8210_hw->flags =
2972                 IEEE802154_HW_AFILT |
2973                 IEEE802154_HW_OMIT_CKSUM |
2974                 IEEE802154_HW_FRAME_RETRIES |
2975                 IEEE802154_HW_PROMISCUOUS |
2976                 IEEE802154_HW_CSMA_PARAMS;
2977         ca8210_hw->phy->flags =
2978                 WPAN_PHY_FLAG_TXPOWER |
2979                 WPAN_PHY_FLAG_CCA_ED_LEVEL |
2980                 WPAN_PHY_FLAG_CCA_MODE;
2981 }
2982
2983 /**
2984  * ca8210_test_interface_init() - Initialise the test file interface
2985  * @priv:  Pointer to private data structure
2986  *
2987  * Provided as an alternative to the standard linux network interface, the test
2988  * interface exposes a file in the filesystem (ca8210_test) that allows
2989  * 802.15.4 SAP Commands and Cascoda EVBME commands to be sent directly to
2990  * the stack.
2991  *
2992  * Return: 0 or linux error code
2993  */
2994 static int ca8210_test_interface_init(struct ca8210_priv *priv)
2995 {
2996         struct ca8210_test *test = &priv->test;
2997         char node_name[32];
2998
2999         snprintf(
3000                 node_name,
3001                 sizeof(node_name),
3002                 "ca8210@%d_%d",
3003                 priv->spi->master->bus_num,
3004                 priv->spi->chip_select
3005         );
3006
3007         test->ca8210_dfs_spi_int = debugfs_create_file(
3008                 node_name,
3009                 0600, /* S_IRUSR | S_IWUSR */
3010                 NULL,
3011                 priv,
3012                 &test_int_fops
3013         );
3014         if (IS_ERR(test->ca8210_dfs_spi_int)) {
3015                 dev_err(
3016                         &priv->spi->dev,
3017                         "Error %ld when creating debugfs node\n",
3018                         PTR_ERR(test->ca8210_dfs_spi_int)
3019                 );
3020                 return PTR_ERR(test->ca8210_dfs_spi_int);
3021         }
3022         debugfs_create_symlink("ca8210", NULL, node_name);
3023         init_waitqueue_head(&test->readq);
3024         return kfifo_alloc(
3025                 &test->up_fifo,
3026                 CA8210_TEST_INT_FIFO_SIZE,
3027                 GFP_KERNEL
3028         );
3029 }
3030
3031 /**
3032  * ca8210_test_interface_clear() - Deinitialise the test file interface
3033  * @priv:  Pointer to private data structure
3034  */
3035 static void ca8210_test_interface_clear(struct ca8210_priv *priv)
3036 {
3037         struct ca8210_test *test = &priv->test;
3038
3039         if (!IS_ERR(test->ca8210_dfs_spi_int))
3040                 debugfs_remove(test->ca8210_dfs_spi_int);
3041         kfifo_free(&test->up_fifo);
3042         dev_info(&priv->spi->dev, "Test interface removed\n");
3043 }
3044
3045 /**
3046  * ca8210_remove() - Shut down a ca8210 upon being disconnected
3047  * @priv:  Pointer to private data structure
3048  *
3049  * Return: 0 or linux error code
3050  */
3051 static int ca8210_remove(struct spi_device *spi_device)
3052 {
3053         struct ca8210_priv *priv;
3054         struct ca8210_platform_data *pdata;
3055
3056         dev_info(&spi_device->dev, "Removing ca8210\n");
3057
3058         pdata = spi_device->dev.platform_data;
3059         if (pdata) {
3060                 if (pdata->extclockenable) {
3061                         ca8210_unregister_ext_clock(spi_device);
3062                         ca8210_config_extern_clk(pdata, spi_device, 0);
3063                 }
3064                 free_irq(pdata->irq_id, spi_device->dev.driver_data);
3065                 kfree(pdata);
3066                 spi_device->dev.platform_data = NULL;
3067         }
3068         /* get spi_device private data */
3069         priv = spi_get_drvdata(spi_device);
3070         if (priv) {
3071                 dev_info(
3072                         &spi_device->dev,
3073                         "sync_down = %d, sync_up = %d\n",
3074                         priv->sync_down,
3075                         priv->sync_up
3076                 );
3077                 ca8210_dev_com_clear(spi_device->dev.driver_data);
3078                 if (priv->hw) {
3079                         if (priv->hw_registered)
3080                                 ieee802154_unregister_hw(priv->hw);
3081                         ieee802154_free_hw(priv->hw);
3082                         priv->hw = NULL;
3083                         dev_info(
3084                                 &spi_device->dev,
3085                                 "Unregistered & freed ieee802154_hw.\n"
3086                         );
3087                 }
3088                 if (IS_ENABLED(CONFIG_IEEE802154_CA8210_DEBUGFS))
3089                         ca8210_test_interface_clear(priv);
3090         }
3091
3092         return 0;
3093 }
3094
3095 /**
3096  * ca8210_probe() - Set up a connected ca8210 upon being detected by the system
3097  * @priv:  Pointer to private data structure
3098  *
3099  * Return: 0 or linux error code
3100  */
3101 static int ca8210_probe(struct spi_device *spi_device)
3102 {
3103         struct ca8210_priv *priv;
3104         struct ieee802154_hw *hw;
3105         struct ca8210_platform_data *pdata;
3106         int ret;
3107
3108         dev_info(&spi_device->dev, "Inserting ca8210\n");
3109
3110         /* allocate ieee802154_hw and private data */
3111         hw = ieee802154_alloc_hw(sizeof(struct ca8210_priv), &ca8210_phy_ops);
3112         if (!hw) {
3113                 dev_crit(&spi_device->dev, "ieee802154_alloc_hw failed\n");
3114                 ret = -ENOMEM;
3115                 goto error;
3116         }
3117
3118         priv = hw->priv;
3119         priv->hw = hw;
3120         priv->spi = spi_device;
3121         hw->parent = &spi_device->dev;
3122         spin_lock_init(&priv->lock);
3123         priv->async_tx_pending = false;
3124         priv->hw_registered = false;
3125         priv->sync_up = 0;
3126         priv->sync_down = 0;
3127         priv->promiscuous = false;
3128         priv->retries = 0;
3129         init_completion(&priv->ca8210_is_awake);
3130         init_completion(&priv->spi_transfer_complete);
3131         init_completion(&priv->sync_exchange_complete);
3132         spi_set_drvdata(priv->spi, priv);
3133         if (IS_ENABLED(CONFIG_IEEE802154_CA8210_DEBUGFS)) {
3134                 cascoda_api_upstream = ca8210_test_int_driver_write;
3135                 ca8210_test_interface_init(priv);
3136         } else {
3137                 cascoda_api_upstream = NULL;
3138         }
3139         ca8210_hw_setup(hw);
3140         ieee802154_random_extended_addr(&hw->phy->perm_extended_addr);
3141
3142         pdata = kmalloc(sizeof(*pdata), GFP_KERNEL);
3143         if (!pdata) {
3144                 ret = -ENOMEM;
3145                 goto error;
3146         }
3147
3148         ret = ca8210_get_platform_data(priv->spi, pdata);
3149         if (ret) {
3150                 dev_crit(&spi_device->dev, "ca8210_get_platform_data failed\n");
3151                 goto error;
3152         }
3153         priv->spi->dev.platform_data = pdata;
3154
3155         ret = ca8210_dev_com_init(priv);
3156         if (ret) {
3157                 dev_crit(&spi_device->dev, "ca8210_dev_com_init failed\n");
3158                 goto error;
3159         }
3160         ret = ca8210_reset_init(priv->spi);
3161         if (ret) {
3162                 dev_crit(&spi_device->dev, "ca8210_reset_init failed\n");
3163                 goto error;
3164         }
3165
3166         ret = ca8210_interrupt_init(priv->spi);
3167         if (ret) {
3168                 dev_crit(&spi_device->dev, "ca8210_interrupt_init failed\n");
3169                 goto error;
3170         }
3171
3172         msleep(100);
3173
3174         ca8210_reset_send(priv->spi, 1);
3175
3176         ret = tdme_chipinit(priv->spi);
3177         if (ret) {
3178                 dev_crit(&spi_device->dev, "tdme_chipinit failed\n");
3179                 goto error;
3180         }
3181
3182         if (pdata->extclockenable) {
3183                 ret = ca8210_config_extern_clk(pdata, priv->spi, 1);
3184                 if (ret) {
3185                         dev_crit(
3186                                 &spi_device->dev,
3187                                 "ca8210_config_extern_clk failed\n"
3188                         );
3189                         goto error;
3190                 }
3191                 ret = ca8210_register_ext_clock(priv->spi);
3192                 if (ret) {
3193                         dev_crit(
3194                                 &spi_device->dev,
3195                                 "ca8210_register_ext_clock failed\n"
3196                         );
3197                         goto error;
3198                 }
3199         }
3200
3201         ret = ieee802154_register_hw(hw);
3202         if (ret) {
3203                 dev_crit(&spi_device->dev, "ieee802154_register_hw failed\n");
3204                 goto error;
3205         }
3206         priv->hw_registered = true;
3207
3208         return 0;
3209 error:
3210         msleep(100); /* wait for pending spi transfers to complete */
3211         ca8210_remove(spi_device);
3212         return link_to_linux_err(ret);
3213 }
3214
3215 static const struct of_device_id ca8210_of_ids[] = {
3216         {.compatible = "cascoda,ca8210", },
3217         {},
3218 };
3219 MODULE_DEVICE_TABLE(of, ca8210_of_ids);
3220
3221 static struct spi_driver ca8210_spi_driver = {
3222         .driver = {
3223                 .name =                 DRIVER_NAME,
3224                 .owner =                THIS_MODULE,
3225                 .of_match_table =       of_match_ptr(ca8210_of_ids),
3226         },
3227         .probe  =                       ca8210_probe,
3228         .remove =                       ca8210_remove
3229 };
3230
3231 module_spi_driver(ca8210_spi_driver);
3232
3233 MODULE_AUTHOR("Harry Morris <h.morris@cascoda.com>");
3234 MODULE_DESCRIPTION("CA-8210 SoftMAC driver");
3235 MODULE_LICENSE("Dual BSD/GPL");
3236 MODULE_VERSION("1.0");