drivers/net/phy/sfp.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/acpi.h>
   3 #include <linux/ctype.h>
   4 #include <linux/delay.h>
   5 #include <linux/gpio/consumer.h>
   6 #include <linux/hwmon.h>
   7 #include <linux/i2c.h>
   8 #include <linux/interrupt.h>
   9 #include <linux/jiffies.h>
  10 #include <linux/module.h>
  11 #include <linux/mutex.h>
  12 #include <linux/of.h>
  13 #include <linux/phy.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/rtnetlink.h>
  16 #include <linux/slab.h>
  17 #include <linux/workqueue.h>
  18
  19 #include "mdio-i2c.h"
  20 #include "sfp.h"
  21 #include "swphy.h"
  22
  23 enum {
  24         GPIO_MODDEF0,
  25         GPIO_LOS,
  26         GPIO_TX_FAULT,
  27         GPIO_TX_DISABLE,
  28         GPIO_RATE_SELECT,
  29         GPIO_MAX,
  30
  31         SFP_F_PRESENT = BIT(GPIO_MODDEF0),
  32         SFP_F_LOS = BIT(GPIO_LOS),
  33         SFP_F_TX_FAULT = BIT(GPIO_TX_FAULT),
  34         SFP_F_TX_DISABLE = BIT(GPIO_TX_DISABLE),
  35         SFP_F_RATE_SELECT = BIT(GPIO_RATE_SELECT),
  36
  37         SFP_E_INSERT = 0,
  38         SFP_E_REMOVE,
  39         SFP_E_DEV_ATTACH,
  40         SFP_E_DEV_DETACH,
  41         SFP_E_DEV_DOWN,
  42         SFP_E_DEV_UP,
  43         SFP_E_TX_FAULT,
  44         SFP_E_TX_CLEAR,
  45         SFP_E_LOS_HIGH,
  46         SFP_E_LOS_LOW,
  47         SFP_E_TIMEOUT,
  48
  49         SFP_MOD_EMPTY = 0,
  50         SFP_MOD_ERROR,
  51         SFP_MOD_PROBE,
  52         SFP_MOD_WAITDEV,
  53         SFP_MOD_HPOWER,
  54         SFP_MOD_WAITPWR,
  55         SFP_MOD_PRESENT,
  56
  57         SFP_DEV_DETACHED = 0,
  58         SFP_DEV_DOWN,
  59         SFP_DEV_UP,
  60
  61         SFP_S_DOWN = 0,
  62         SFP_S_FAIL,
  63         SFP_S_WAIT,
  64         SFP_S_INIT,
  65         SFP_S_INIT_PHY,
  66         SFP_S_INIT_TX_FAULT,
  67         SFP_S_WAIT_LOS,
  68         SFP_S_LINK_UP,
  69         SFP_S_TX_FAULT,
  70         SFP_S_REINIT,
  71         SFP_S_TX_DISABLE,
  72 };
  73
  74 static const char  * const mod_state_strings[] = {
  75         [SFP_MOD_EMPTY] = "empty",
  76         [SFP_MOD_ERROR] = "error",
  77         [SFP_MOD_PROBE] = "probe",
  78         [SFP_MOD_WAITDEV] = "waitdev",
  79         [SFP_MOD_HPOWER] = "hpower",
  80         [SFP_MOD_WAITPWR] = "waitpwr",
  81         [SFP_MOD_PRESENT] = "present",
  82 };
  83
  84 static const char *mod_state_to_str(unsigned short mod_state)
  85 {
  86         if (mod_state >= ARRAY_SIZE(mod_state_strings))
  87                 return "Unknown module state";
  88         return mod_state_strings[mod_state];
  89 }
  90
  91 static const char * const dev_state_strings[] = {
  92         [SFP_DEV_DETACHED] = "detached",
  93         [SFP_DEV_DOWN] = "down",
  94         [SFP_DEV_UP] = "up",
  95 };
  96
  97 static const char *dev_state_to_str(unsigned short dev_state)
  98 {
  99         if (dev_state >= ARRAY_SIZE(dev_state_strings))
 100                 return "Unknown device state";
 101         return dev_state_strings[dev_state];
 102 }
 103
 104 static const char * const event_strings[] = {
 105         [SFP_E_INSERT] = "insert",
 106         [SFP_E_REMOVE] = "remove",
 107         [SFP_E_DEV_ATTACH] = "dev_attach",
 108         [SFP_E_DEV_DETACH] = "dev_detach",
 109         [SFP_E_DEV_DOWN] = "dev_down",
 110         [SFP_E_DEV_UP] = "dev_up",
 111         [SFP_E_TX_FAULT] = "tx_fault",
 112         [SFP_E_TX_CLEAR] = "tx_clear",
 113         [SFP_E_LOS_HIGH] = "los_high",
 114         [SFP_E_LOS_LOW] = "los_low",
 115         [SFP_E_TIMEOUT] = "timeout",
 116 };
 117
 118 static const char *event_to_str(unsigned short event)
 119 {
 120         if (event >= ARRAY_SIZE(event_strings))
 121                 return "Unknown event";
 122         return event_strings[event];
 123 }
 124
 125 static const char * const sm_state_strings[] = {
 126         [SFP_S_DOWN] = "down",
 127         [SFP_S_FAIL] = "fail",
 128         [SFP_S_WAIT] = "wait",
 129         [SFP_S_INIT] = "init",
 130         [SFP_S_INIT_PHY] = "init_phy",
 131         [SFP_S_INIT_TX_FAULT] = "init_tx_fault",
 132         [SFP_S_WAIT_LOS] = "wait_los",
 133         [SFP_S_LINK_UP] = "link_up",
 134         [SFP_S_TX_FAULT] = "tx_fault",
 135         [SFP_S_REINIT] = "reinit",
 136         [SFP_S_TX_DISABLE] = "rx_disable",
 137 };
 138
 139 static const char *sm_state_to_str(unsigned short sm_state)
 140 {
 141         if (sm_state >= ARRAY_SIZE(sm_state_strings))
 142                 return "Unknown state";
 143         return sm_state_strings[sm_state];
 144 }
 145
 146 static const char *gpio_of_names[] = {
 147         "mod-def0",
 148         "los",
 149         "tx-fault",
 150         "tx-disable",
 151         "rate-select0",
 152 };
 153
 154 static const enum gpiod_flags gpio_flags[] = {
 155         GPIOD_IN,
 156         GPIOD_IN,
 157         GPIOD_IN,
 158         GPIOD_ASIS,
 159         GPIOD_ASIS,
 160 };
 161
 162 /* t_start_up (SFF-8431) or t_init (SFF-8472) is the time required for a
 163  * non-cooled module to initialise its laser safety circuitry. We wait
 164  * an initial T_WAIT period before we check the tx fault to give any PHY
 165  * on board (for a copper SFP) time to initialise.
 166  */
 167 #define T_WAIT                  msecs_to_jiffies(50)
 168 #define T_START_UP              msecs_to_jiffies(300)
 169 #define T_START_UP_BAD_GPON     msecs_to_jiffies(60000)
 170
 171 /* t_reset is the time required to assert the TX_DISABLE signal to reset
 172  * an indicated TX_FAULT.
 173  */
 174 #define T_RESET_US              10
 175 #define T_FAULT_RECOVER         msecs_to_jiffies(1000)
 176
 177 /* N_FAULT_INIT is the number of recovery attempts at module initialisation
 178  * time. If the TX_FAULT signal is not deasserted after this number of
 179  * attempts at clearing it, we decide that the module is faulty.
 180  * N_FAULT is the same but after the module has initialised.
 181  */
 182 #define N_FAULT_INIT            5
 183 #define N_FAULT                 5
 184
 185 /* T_PHY_RETRY is the time interval between attempts to probe the PHY.
 186  * R_PHY_RETRY is the number of attempts.
 187  */
 188 #define T_PHY_RETRY             msecs_to_jiffies(50)
 189 #define R_PHY_RETRY             12
 190
 191 /* SFP module presence detection is poor: the three MOD DEF signals are
 192  * the same length on the PCB, which means it's possible for MOD DEF 0 to
 193  * connect before the I2C bus on MOD DEF 1/2.
 194  *
 195  * The SFF-8472 specifies t_serial ("Time from power on until module is
 196  * ready for data transmission over the two wire serial bus.") as 300ms.
 197  */
 198 #define T_SERIAL                msecs_to_jiffies(300)
 199 #define T_HPOWER_LEVEL          msecs_to_jiffies(300)
 200 #define T_PROBE_RETRY_INIT      msecs_to_jiffies(100)
 201 #define R_PROBE_RETRY_INIT      10
 202 #define T_PROBE_RETRY_SLOW      msecs_to_jiffies(5000)
 203 #define R_PROBE_RETRY_SLOW      12
 204
 205 /* SFP modules appear to always have their PHY configured for bus address
 206  * 0x56 (which with mdio-i2c, translates to a PHY address of 22).
 207  */
 208 #define SFP_PHY_ADDR    22
 209
 210 struct sff_data {
 211         unsigned int gpios;
 212         bool (*module_supported)(const struct sfp_eeprom_id *id);
 213 };
 214
 215 struct sfp {
 216         struct device *dev;
 217         struct i2c_adapter *i2c;
 218         struct mii_bus *i2c_mii;
 219         struct sfp_bus *sfp_bus;
 220         struct phy_device *mod_phy;
 221         const struct sff_data *type;
 222         u32 max_power_mW;
 223
 224         unsigned int (*get_state)(struct sfp *);
 225         void (*set_state)(struct sfp *, unsigned int);
 226         int (*read)(struct sfp *, bool, u8, void *, size_t);
 227         int (*write)(struct sfp *, bool, u8, void *, size_t);
 228
 229         struct gpio_desc *gpio[GPIO_MAX];
 230         int gpio_irq[GPIO_MAX];
 231
 232         bool need_poll;
 233
 234         struct mutex st_mutex;                  /* Protects state */
 235         unsigned int state_soft_mask;
 236         unsigned int state;
 237         struct delayed_work poll;
 238         struct delayed_work timeout;
 239         struct mutex sm_mutex;                  /* Protects state machine */
 240         unsigned char sm_mod_state;
 241         unsigned char sm_mod_tries_init;
 242         unsigned char sm_mod_tries;
 243         unsigned char sm_dev_state;
 244         unsigned short sm_state;
 245         unsigned char sm_fault_retries;
 246         unsigned char sm_phy_retries;
 247
 248         struct sfp_eeprom_id id;
 249         unsigned int module_power_mW;
 250         unsigned int module_t_start_up;
 251
 252 #if IS_ENABLED(CONFIG_HWMON)
 253         struct sfp_diag diag;
 254         struct delayed_work hwmon_probe;
 255         unsigned int hwmon_tries;
 256         struct device *hwmon_dev;
 257         char *hwmon_name;
 258 #endif
 259
 260 };
 261
 262 static bool sff_module_supported(const struct sfp_eeprom_id *id)
 263 {
 264         return id->base.phys_id == SFF8024_ID_SFF_8472 &&
 265                id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
 266 }
 267
 268 static const struct sff_data sff_data = {
 269         .gpios = SFP_F_LOS | SFP_F_TX_FAULT | SFP_F_TX_DISABLE,
 270         .module_supported = sff_module_supported,
 271 };
 272
 273 static bool sfp_module_supported(const struct sfp_eeprom_id *id)
 274 {
 275         return id->base.phys_id == SFF8024_ID_SFP &&
 276                id->base.phys_ext_id == SFP_PHYS_EXT_ID_SFP;
 277 }
 278
 279 static const struct sff_data sfp_data = {
 280         .gpios = SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT |
 281                  SFP_F_TX_DISABLE | SFP_F_RATE_SELECT,
 282         .module_supported = sfp_module_supported,
 283 };
 284
 285 static const struct of_device_id sfp_of_match[] = {
 286         { .compatible = "sff,sff", .data = &sff_data, },
 287         { .compatible = "sff,sfp", .data = &sfp_data, },
 288         { },
 289 };
 290 MODULE_DEVICE_TABLE(of, sfp_of_match);
 291
 292 static unsigned long poll_jiffies;
 293
 294 static unsigned int sfp_gpio_get_state(struct sfp *sfp)
 295 {
 296         unsigned int i, state, v;
 297
 298         for (i = state = 0; i < GPIO_MAX; i++) {
 299                 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
 300                         continue;
 301
 302                 v = gpiod_get_value_cansleep(sfp->gpio[i]);
 303                 if (v)
 304                         state |= BIT(i);
 305         }
 306
 307         return state;
 308 }
 309
 310 static unsigned int sff_gpio_get_state(struct sfp *sfp)
 311 {
 312         return sfp_gpio_get_state(sfp) | SFP_F_PRESENT;
 313 }
 314
 315 static void sfp_gpio_set_state(struct sfp *sfp, unsigned int state)
 316 {
 317         if (state & SFP_F_PRESENT) {
 318                 /* If the module is present, drive the signals */
 319                 if (sfp->gpio[GPIO_TX_DISABLE])
 320                         gpiod_direction_output(sfp->gpio[GPIO_TX_DISABLE],
 321                                                state & SFP_F_TX_DISABLE);
 322                 if (state & SFP_F_RATE_SELECT)
 323                         gpiod_direction_output(sfp->gpio[GPIO_RATE_SELECT],
 324                                                state & SFP_F_RATE_SELECT);
 325         } else {
 326                 /* Otherwise, let them float to the pull-ups */
 327                 if (sfp->gpio[GPIO_TX_DISABLE])
 328                         gpiod_direction_input(sfp->gpio[GPIO_TX_DISABLE]);
 329                 if (state & SFP_F_RATE_SELECT)
 330                         gpiod_direction_input(sfp->gpio[GPIO_RATE_SELECT]);
 331         }
 332 }
 333
 334 static int sfp_i2c_read(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
 335                         size_t len)
 336 {
 337         struct i2c_msg msgs[2];
 338         u8 bus_addr = a2 ? 0x51 : 0x50;
 339         size_t this_len;
 340         int ret;
 341
 342         msgs[0].addr = bus_addr;
 343         msgs[0].flags = 0;
 344         msgs[0].len = 1;
 345         msgs[0].buf = &dev_addr;
 346         msgs[1].addr = bus_addr;
 347         msgs[1].flags = I2C_M_RD;
 348         msgs[1].len = len;
 349         msgs[1].buf = buf;
 350
 351         while (len) {
 352                 this_len = len;
 353                 if (this_len > 16)
 354                         this_len = 16;
 355
 356                 msgs[1].len = this_len;
 357
 358                 ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
 359                 if (ret < 0)
 360                         return ret;
 361
 362                 if (ret != ARRAY_SIZE(msgs))
 363                         break;
 364
 365                 msgs[1].buf += this_len;
 366                 dev_addr += this_len;
 367                 len -= this_len;
 368         }
 369
 370         return msgs[1].buf - (u8 *)buf;
 371 }
 372
 373 static int sfp_i2c_write(struct sfp *sfp, bool a2, u8 dev_addr, void *buf,
 374         size_t len)
 375 {
 376         struct i2c_msg msgs[1];
 377         u8 bus_addr = a2 ? 0x51 : 0x50;
 378         int ret;
 379
 380         msgs[0].addr = bus_addr;
 381         msgs[0].flags = 0;
 382         msgs[0].len = 1 + len;
 383         msgs[0].buf = kmalloc(1 + len, GFP_KERNEL);
 384         if (!msgs[0].buf)
 385                 return -ENOMEM;
 386
 387         msgs[0].buf[0] = dev_addr;
 388         memcpy(&msgs[0].buf[1], buf, len);
 389
 390         ret = i2c_transfer(sfp->i2c, msgs, ARRAY_SIZE(msgs));
 391
 392         kfree(msgs[0].buf);
 393
 394         if (ret < 0)
 395                 return ret;
 396
 397         return ret == ARRAY_SIZE(msgs) ? len : 0;
 398 }
 399
 400 static int sfp_i2c_configure(struct sfp *sfp, struct i2c_adapter *i2c)
 401 {
 402         struct mii_bus *i2c_mii;
 403         int ret;
 404
 405         if (!i2c_check_functionality(i2c, I2C_FUNC_I2C))
 406                 return -EINVAL;
 407
 408         sfp->i2c = i2c;
 409         sfp->read = sfp_i2c_read;
 410         sfp->write = sfp_i2c_write;
 411
 412         i2c_mii = mdio_i2c_alloc(sfp->dev, i2c);
 413         if (IS_ERR(i2c_mii))
 414                 return PTR_ERR(i2c_mii);
 415
 416         i2c_mii->name = "SFP I2C Bus";
 417         i2c_mii->phy_mask = ~0;
 418
 419         ret = mdiobus_register(i2c_mii);
 420         if (ret < 0) {
 421                 mdiobus_free(i2c_mii);
 422                 return ret;
 423         }
 424
 425         sfp->i2c_mii = i2c_mii;
 426
 427         return 0;
 428 }
 429
 430 /* Interface */
 431 static int sfp_read(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
 432 {
 433         return sfp->read(sfp, a2, addr, buf, len);
 434 }
 435
 436 static int sfp_write(struct sfp *sfp, bool a2, u8 addr, void *buf, size_t len)
 437 {
 438         return sfp->write(sfp, a2, addr, buf, len);
 439 }
 440
 441 static unsigned int sfp_soft_get_state(struct sfp *sfp)
 442 {
 443         unsigned int state = 0;
 444         u8 status;
 445         int ret;
 446
 447         ret = sfp_read(sfp, true, SFP_STATUS, &status, sizeof(status));
 448         if (ret == sizeof(status)) {
 449                 if (status & SFP_STATUS_RX_LOS)
 450                         state |= SFP_F_LOS;
 451                 if (status & SFP_STATUS_TX_FAULT)
 452                         state |= SFP_F_TX_FAULT;
 453         } else {
 454                 dev_err_ratelimited(sfp->dev,
 455                                     "failed to read SFP soft status: %d\n",
 456                                     ret);
 457                 /* Preserve the current state */
 458                 state = sfp->state;
 459         }
 460
 461         return state & sfp->state_soft_mask;
 462 }
 463
 464 static void sfp_soft_set_state(struct sfp *sfp, unsigned int state)
 465 {
 466         u8 status;
 467
 468         if (sfp_read(sfp, true, SFP_STATUS, &status, sizeof(status)) ==
 469                      sizeof(status)) {
 470                 if (state & SFP_F_TX_DISABLE)
 471                         status |= SFP_STATUS_TX_DISABLE_FORCE;
 472                 else
 473                         status &= ~SFP_STATUS_TX_DISABLE_FORCE;
 474
 475                 sfp_write(sfp, true, SFP_STATUS, &status, sizeof(status));
 476         }
 477 }
 478
 479 static void sfp_soft_start_poll(struct sfp *sfp)
 480 {
 481         const struct sfp_eeprom_id *id = &sfp->id;
 482
 483         sfp->state_soft_mask = 0;
 484         if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_DISABLE &&
 485             !sfp->gpio[GPIO_TX_DISABLE])
 486                 sfp->state_soft_mask |= SFP_F_TX_DISABLE;
 487         if (id->ext.enhopts & SFP_ENHOPTS_SOFT_TX_FAULT &&
 488             !sfp->gpio[GPIO_TX_FAULT])
 489                 sfp->state_soft_mask |= SFP_F_TX_FAULT;
 490         if (id->ext.enhopts & SFP_ENHOPTS_SOFT_RX_LOS &&
 491             !sfp->gpio[GPIO_LOS])
 492                 sfp->state_soft_mask |= SFP_F_LOS;
 493
 494         if (sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT) &&
 495             !sfp->need_poll)
 496                 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
 497 }
 498
 499 static void sfp_soft_stop_poll(struct sfp *sfp)
 500 {
 501         sfp->state_soft_mask = 0;
 502 }
 503
 504 static unsigned int sfp_get_state(struct sfp *sfp)
 505 {
 506         unsigned int state = sfp->get_state(sfp);
 507
 508         if (state & SFP_F_PRESENT &&
 509             sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT))
 510                 state |= sfp_soft_get_state(sfp);
 511
 512         return state;
 513 }
 514
 515 static void sfp_set_state(struct sfp *sfp, unsigned int state)
 516 {
 517         sfp->set_state(sfp, state);
 518
 519         if (state & SFP_F_PRESENT &&
 520             sfp->state_soft_mask & SFP_F_TX_DISABLE)
 521                 sfp_soft_set_state(sfp, state);
 522 }
 523
 524 static unsigned int sfp_check(void *buf, size_t len)
 525 {
 526         u8 *p, check;
 527
 528         for (p = buf, check = 0; len; p++, len--)
 529                 check += *p;
 530
 531         return check;
 532 }
 533
 534 /* hwmon */
 535 #if IS_ENABLED(CONFIG_HWMON)
 536 static umode_t sfp_hwmon_is_visible(const void *data,
 537                                     enum hwmon_sensor_types type,
 538                                     u32 attr, int channel)
 539 {
 540         const struct sfp *sfp = data;
 541
 542         switch (type) {
 543         case hwmon_temp:
 544                 switch (attr) {
 545                 case hwmon_temp_min_alarm:
 546                 case hwmon_temp_max_alarm:
 547                 case hwmon_temp_lcrit_alarm:
 548                 case hwmon_temp_crit_alarm:
 549                 case hwmon_temp_min:
 550                 case hwmon_temp_max:
 551                 case hwmon_temp_lcrit:
 552                 case hwmon_temp_crit:
 553                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 554                                 return 0;
 555                         fallthrough;
 556                 case hwmon_temp_input:
 557                 case hwmon_temp_label:
 558                         return 0444;
 559                 default:
 560                         return 0;
 561                 }
 562         case hwmon_in:
 563                 switch (attr) {
 564                 case hwmon_in_min_alarm:
 565                 case hwmon_in_max_alarm:
 566                 case hwmon_in_lcrit_alarm:
 567                 case hwmon_in_crit_alarm:
 568                 case hwmon_in_min:
 569                 case hwmon_in_max:
 570                 case hwmon_in_lcrit:
 571                 case hwmon_in_crit:
 572                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 573                                 return 0;
 574                         fallthrough;
 575                 case hwmon_in_input:
 576                 case hwmon_in_label:
 577                         return 0444;
 578                 default:
 579                         return 0;
 580                 }
 581         case hwmon_curr:
 582                 switch (attr) {
 583                 case hwmon_curr_min_alarm:
 584                 case hwmon_curr_max_alarm:
 585                 case hwmon_curr_lcrit_alarm:
 586                 case hwmon_curr_crit_alarm:
 587                 case hwmon_curr_min:
 588                 case hwmon_curr_max:
 589                 case hwmon_curr_lcrit:
 590                 case hwmon_curr_crit:
 591                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 592                                 return 0;
 593                         fallthrough;
 594                 case hwmon_curr_input:
 595                 case hwmon_curr_label:
 596                         return 0444;
 597                 default:
 598                         return 0;
 599                 }
 600         case hwmon_power:
 601                 /* External calibration of receive power requires
 602                  * floating point arithmetic. Doing that in the kernel
 603                  * is not easy, so just skip it. If the module does
 604                  * not require external calibration, we can however
 605                  * show receiver power, since FP is then not needed.
 606                  */
 607                 if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL &&
 608                     channel == 1)
 609                         return 0;
 610                 switch (attr) {
 611                 case hwmon_power_min_alarm:
 612                 case hwmon_power_max_alarm:
 613                 case hwmon_power_lcrit_alarm:
 614                 case hwmon_power_crit_alarm:
 615                 case hwmon_power_min:
 616                 case hwmon_power_max:
 617                 case hwmon_power_lcrit:
 618                 case hwmon_power_crit:
 619                         if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
 620                                 return 0;
 621                         fallthrough;
 622                 case hwmon_power_input:
 623                 case hwmon_power_label:
 624                         return 0444;
 625                 default:
 626                         return 0;
 627                 }
 628         default:
 629                 return 0;
 630         }
 631 }
 632
 633 static int sfp_hwmon_read_sensor(struct sfp *sfp, int reg, long *value)
 634 {
 635         __be16 val;
 636         int err;
 637
 638         err = sfp_read(sfp, true, reg, &val, sizeof(val));
 639         if (err < 0)
 640                 return err;
 641
 642         *value = be16_to_cpu(val);
 643
 644         return 0;
 645 }
 646
 647 static void sfp_hwmon_to_rx_power(long *value)
 648 {
 649         *value = DIV_ROUND_CLOSEST(*value, 10);
 650 }
 651
 652 static void sfp_hwmon_calibrate(struct sfp *sfp, unsigned int slope, int offset,
 653                                 long *value)
 654 {
 655         if (sfp->id.ext.diagmon & SFP_DIAGMON_EXT_CAL)
 656                 *value = DIV_ROUND_CLOSEST(*value * slope, 256) + offset;
 657 }
 658
 659 static void sfp_hwmon_calibrate_temp(struct sfp *sfp, long *value)
 660 {
 661         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_t_slope),
 662                             be16_to_cpu(sfp->diag.cal_t_offset), value);
 663
 664         if (*value >= 0x8000)
 665                 *value -= 0x10000;
 666
 667         *value = DIV_ROUND_CLOSEST(*value * 1000, 256);
 668 }
 669
 670 static void sfp_hwmon_calibrate_vcc(struct sfp *sfp, long *value)
 671 {
 672         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_v_slope),
 673                             be16_to_cpu(sfp->diag.cal_v_offset), value);
 674
 675         *value = DIV_ROUND_CLOSEST(*value, 10);
 676 }
 677
 678 static void sfp_hwmon_calibrate_bias(struct sfp *sfp, long *value)
 679 {
 680         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txi_slope),
 681                             be16_to_cpu(sfp->diag.cal_txi_offset), value);
 682
 683         *value = DIV_ROUND_CLOSEST(*value, 500);
 684 }
 685
 686 static void sfp_hwmon_calibrate_tx_power(struct sfp *sfp, long *value)
 687 {
 688         sfp_hwmon_calibrate(sfp, be16_to_cpu(sfp->diag.cal_txpwr_slope),
 689                             be16_to_cpu(sfp->diag.cal_txpwr_offset), value);
 690
 691         *value = DIV_ROUND_CLOSEST(*value, 10);
 692 }
 693
 694 static int sfp_hwmon_read_temp(struct sfp *sfp, int reg, long *value)
 695 {
 696         int err;
 697
 698         err = sfp_hwmon_read_sensor(sfp, reg, value);
 699         if (err < 0)
 700                 return err;
 701
 702         sfp_hwmon_calibrate_temp(sfp, value);
 703
 704         return 0;
 705 }
 706
 707 static int sfp_hwmon_read_vcc(struct sfp *sfp, int reg, long *value)
 708 {
 709         int err;
 710
 711         err = sfp_hwmon_read_sensor(sfp, reg, value);
 712         if (err < 0)
 713                 return err;
 714
 715         sfp_hwmon_calibrate_vcc(sfp, value);
 716
 717         return 0;
 718 }
 719
 720 static int sfp_hwmon_read_bias(struct sfp *sfp, int reg, long *value)
 721 {
 722         int err;
 723
 724         err = sfp_hwmon_read_sensor(sfp, reg, value);
 725         if (err < 0)
 726                 return err;
 727
 728         sfp_hwmon_calibrate_bias(sfp, value);
 729
 730         return 0;
 731 }
 732
 733 static int sfp_hwmon_read_tx_power(struct sfp *sfp, int reg, long *value)
 734 {
 735         int err;
 736
 737         err = sfp_hwmon_read_sensor(sfp, reg, value);
 738         if (err < 0)
 739                 return err;
 740
 741         sfp_hwmon_calibrate_tx_power(sfp, value);
 742
 743         return 0;
 744 }
 745
 746 static int sfp_hwmon_read_rx_power(struct sfp *sfp, int reg, long *value)
 747 {
 748         int err;
 749
 750         err = sfp_hwmon_read_sensor(sfp, reg, value);
 751         if (err < 0)
 752                 return err;
 753
 754         sfp_hwmon_to_rx_power(value);
 755
 756         return 0;
 757 }
 758
 759 static int sfp_hwmon_temp(struct sfp *sfp, u32 attr, long *value)
 760 {
 761         u8 status;
 762         int err;
 763
 764         switch (attr) {
 765         case hwmon_temp_input:
 766                 return sfp_hwmon_read_temp(sfp, SFP_TEMP, value);
 767
 768         case hwmon_temp_lcrit:
 769                 *value = be16_to_cpu(sfp->diag.temp_low_alarm);
 770                 sfp_hwmon_calibrate_temp(sfp, value);
 771                 return 0;
 772
 773         case hwmon_temp_min:
 774                 *value = be16_to_cpu(sfp->diag.temp_low_warn);
 775                 sfp_hwmon_calibrate_temp(sfp, value);
 776                 return 0;
 777         case hwmon_temp_max:
 778                 *value = be16_to_cpu(sfp->diag.temp_high_warn);
 779                 sfp_hwmon_calibrate_temp(sfp, value);
 780                 return 0;
 781
 782         case hwmon_temp_crit:
 783                 *value = be16_to_cpu(sfp->diag.temp_high_alarm);
 784                 sfp_hwmon_calibrate_temp(sfp, value);
 785                 return 0;
 786
 787         case hwmon_temp_lcrit_alarm:
 788                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 789                 if (err < 0)
 790                         return err;
 791
 792                 *value = !!(status & SFP_ALARM0_TEMP_LOW);
 793                 return 0;
 794
 795         case hwmon_temp_min_alarm:
 796                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 797                 if (err < 0)
 798                         return err;
 799
 800                 *value = !!(status & SFP_WARN0_TEMP_LOW);
 801                 return 0;
 802
 803         case hwmon_temp_max_alarm:
 804                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 805                 if (err < 0)
 806                         return err;
 807
 808                 *value = !!(status & SFP_WARN0_TEMP_HIGH);
 809                 return 0;
 810
 811         case hwmon_temp_crit_alarm:
 812                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 813                 if (err < 0)
 814                         return err;
 815
 816                 *value = !!(status & SFP_ALARM0_TEMP_HIGH);
 817                 return 0;
 818         default:
 819                 return -EOPNOTSUPP;
 820         }
 821
 822         return -EOPNOTSUPP;
 823 }
 824
 825 static int sfp_hwmon_vcc(struct sfp *sfp, u32 attr, long *value)
 826 {
 827         u8 status;
 828         int err;
 829
 830         switch (attr) {
 831         case hwmon_in_input:
 832                 return sfp_hwmon_read_vcc(sfp, SFP_VCC, value);
 833
 834         case hwmon_in_lcrit:
 835                 *value = be16_to_cpu(sfp->diag.volt_low_alarm);
 836                 sfp_hwmon_calibrate_vcc(sfp, value);
 837                 return 0;
 838
 839         case hwmon_in_min:
 840                 *value = be16_to_cpu(sfp->diag.volt_low_warn);
 841                 sfp_hwmon_calibrate_vcc(sfp, value);
 842                 return 0;
 843
 844         case hwmon_in_max:
 845                 *value = be16_to_cpu(sfp->diag.volt_high_warn);
 846                 sfp_hwmon_calibrate_vcc(sfp, value);
 847                 return 0;
 848
 849         case hwmon_in_crit:
 850                 *value = be16_to_cpu(sfp->diag.volt_high_alarm);
 851                 sfp_hwmon_calibrate_vcc(sfp, value);
 852                 return 0;
 853
 854         case hwmon_in_lcrit_alarm:
 855                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 856                 if (err < 0)
 857                         return err;
 858
 859                 *value = !!(status & SFP_ALARM0_VCC_LOW);
 860                 return 0;
 861
 862         case hwmon_in_min_alarm:
 863                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 864                 if (err < 0)
 865                         return err;
 866
 867                 *value = !!(status & SFP_WARN0_VCC_LOW);
 868                 return 0;
 869
 870         case hwmon_in_max_alarm:
 871                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 872                 if (err < 0)
 873                         return err;
 874
 875                 *value = !!(status & SFP_WARN0_VCC_HIGH);
 876                 return 0;
 877
 878         case hwmon_in_crit_alarm:
 879                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 880                 if (err < 0)
 881                         return err;
 882
 883                 *value = !!(status & SFP_ALARM0_VCC_HIGH);
 884                 return 0;
 885         default:
 886                 return -EOPNOTSUPP;
 887         }
 888
 889         return -EOPNOTSUPP;
 890 }
 891
 892 static int sfp_hwmon_bias(struct sfp *sfp, u32 attr, long *value)
 893 {
 894         u8 status;
 895         int err;
 896
 897         switch (attr) {
 898         case hwmon_curr_input:
 899                 return sfp_hwmon_read_bias(sfp, SFP_TX_BIAS, value);
 900
 901         case hwmon_curr_lcrit:
 902                 *value = be16_to_cpu(sfp->diag.bias_low_alarm);
 903                 sfp_hwmon_calibrate_bias(sfp, value);
 904                 return 0;
 905
 906         case hwmon_curr_min:
 907                 *value = be16_to_cpu(sfp->diag.bias_low_warn);
 908                 sfp_hwmon_calibrate_bias(sfp, value);
 909                 return 0;
 910
 911         case hwmon_curr_max:
 912                 *value = be16_to_cpu(sfp->diag.bias_high_warn);
 913                 sfp_hwmon_calibrate_bias(sfp, value);
 914                 return 0;
 915
 916         case hwmon_curr_crit:
 917                 *value = be16_to_cpu(sfp->diag.bias_high_alarm);
 918                 sfp_hwmon_calibrate_bias(sfp, value);
 919                 return 0;
 920
 921         case hwmon_curr_lcrit_alarm:
 922                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 923                 if (err < 0)
 924                         return err;
 925
 926                 *value = !!(status & SFP_ALARM0_TX_BIAS_LOW);
 927                 return 0;
 928
 929         case hwmon_curr_min_alarm:
 930                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 931                 if (err < 0)
 932                         return err;
 933
 934                 *value = !!(status & SFP_WARN0_TX_BIAS_LOW);
 935                 return 0;
 936
 937         case hwmon_curr_max_alarm:
 938                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 939                 if (err < 0)
 940                         return err;
 941
 942                 *value = !!(status & SFP_WARN0_TX_BIAS_HIGH);
 943                 return 0;
 944
 945         case hwmon_curr_crit_alarm:
 946                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 947                 if (err < 0)
 948                         return err;
 949
 950                 *value = !!(status & SFP_ALARM0_TX_BIAS_HIGH);
 951                 return 0;
 952         default:
 953                 return -EOPNOTSUPP;
 954         }
 955
 956         return -EOPNOTSUPP;
 957 }
 958
 959 static int sfp_hwmon_tx_power(struct sfp *sfp, u32 attr, long *value)
 960 {
 961         u8 status;
 962         int err;
 963
 964         switch (attr) {
 965         case hwmon_power_input:
 966                 return sfp_hwmon_read_tx_power(sfp, SFP_TX_POWER, value);
 967
 968         case hwmon_power_lcrit:
 969                 *value = be16_to_cpu(sfp->diag.txpwr_low_alarm);
 970                 sfp_hwmon_calibrate_tx_power(sfp, value);
 971                 return 0;
 972
 973         case hwmon_power_min:
 974                 *value = be16_to_cpu(sfp->diag.txpwr_low_warn);
 975                 sfp_hwmon_calibrate_tx_power(sfp, value);
 976                 return 0;
 977
 978         case hwmon_power_max:
 979                 *value = be16_to_cpu(sfp->diag.txpwr_high_warn);
 980                 sfp_hwmon_calibrate_tx_power(sfp, value);
 981                 return 0;
 982
 983         case hwmon_power_crit:
 984                 *value = be16_to_cpu(sfp->diag.txpwr_high_alarm);
 985                 sfp_hwmon_calibrate_tx_power(sfp, value);
 986                 return 0;
 987
 988         case hwmon_power_lcrit_alarm:
 989                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
 990                 if (err < 0)
 991                         return err;
 992
 993                 *value = !!(status & SFP_ALARM0_TXPWR_LOW);
 994                 return 0;
 995
 996         case hwmon_power_min_alarm:
 997                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
 998                 if (err < 0)
 999                         return err;
1000
1001                 *value = !!(status & SFP_WARN0_TXPWR_LOW);
1002                 return 0;
1003
1004         case hwmon_power_max_alarm:
1005                 err = sfp_read(sfp, true, SFP_WARN0, &status, sizeof(status));
1006                 if (err < 0)
1007                         return err;
1008
1009                 *value = !!(status & SFP_WARN0_TXPWR_HIGH);
1010                 return 0;
1011
1012         case hwmon_power_crit_alarm:
1013                 err = sfp_read(sfp, true, SFP_ALARM0, &status, sizeof(status));
1014                 if (err < 0)
1015                         return err;
1016
1017                 *value = !!(status & SFP_ALARM0_TXPWR_HIGH);
1018                 return 0;
1019         default:
1020                 return -EOPNOTSUPP;
1021         }
1022
1023         return -EOPNOTSUPP;
1024 }
1025
1026 static int sfp_hwmon_rx_power(struct sfp *sfp, u32 attr, long *value)
1027 {
1028         u8 status;
1029         int err;
1030
1031         switch (attr) {
1032         case hwmon_power_input:
1033                 return sfp_hwmon_read_rx_power(sfp, SFP_RX_POWER, value);
1034
1035         case hwmon_power_lcrit:
1036                 *value = be16_to_cpu(sfp->diag.rxpwr_low_alarm);
1037                 sfp_hwmon_to_rx_power(value);
1038                 return 0;
1039
1040         case hwmon_power_min:
1041                 *value = be16_to_cpu(sfp->diag.rxpwr_low_warn);
1042                 sfp_hwmon_to_rx_power(value);
1043                 return 0;
1044
1045         case hwmon_power_max:
1046                 *value = be16_to_cpu(sfp->diag.rxpwr_high_warn);
1047                 sfp_hwmon_to_rx_power(value);
1048                 return 0;
1049
1050         case hwmon_power_crit:
1051                 *value = be16_to_cpu(sfp->diag.rxpwr_high_alarm);
1052                 sfp_hwmon_to_rx_power(value);
1053                 return 0;
1054
1055         case hwmon_power_lcrit_alarm:
1056                 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
1057                 if (err < 0)
1058                         return err;
1059
1060                 *value = !!(status & SFP_ALARM1_RXPWR_LOW);
1061                 return 0;
1062
1063         case hwmon_power_min_alarm:
1064                 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
1065                 if (err < 0)
1066                         return err;
1067
1068                 *value = !!(status & SFP_WARN1_RXPWR_LOW);
1069                 return 0;
1070
1071         case hwmon_power_max_alarm:
1072                 err = sfp_read(sfp, true, SFP_WARN1, &status, sizeof(status));
1073                 if (err < 0)
1074                         return err;
1075
1076                 *value = !!(status & SFP_WARN1_RXPWR_HIGH);
1077                 return 0;
1078
1079         case hwmon_power_crit_alarm:
1080                 err = sfp_read(sfp, true, SFP_ALARM1, &status, sizeof(status));
1081                 if (err < 0)
1082                         return err;
1083
1084                 *value = !!(status & SFP_ALARM1_RXPWR_HIGH);
1085                 return 0;
1086         default:
1087                 return -EOPNOTSUPP;
1088         }
1089
1090         return -EOPNOTSUPP;
1091 }
1092
1093 static int sfp_hwmon_read(struct device *dev, enum hwmon_sensor_types type,
1094                           u32 attr, int channel, long *value)
1095 {
1096         struct sfp *sfp = dev_get_drvdata(dev);
1097
1098         switch (type) {
1099         case hwmon_temp:
1100                 return sfp_hwmon_temp(sfp, attr, value);
1101         case hwmon_in:
1102                 return sfp_hwmon_vcc(sfp, attr, value);
1103         case hwmon_curr:
1104                 return sfp_hwmon_bias(sfp, attr, value);
1105         case hwmon_power:
1106                 switch (channel) {
1107                 case 0:
1108                         return sfp_hwmon_tx_power(sfp, attr, value);
1109                 case 1:
1110                         return sfp_hwmon_rx_power(sfp, attr, value);
1111                 default:
1112                         return -EOPNOTSUPP;
1113                 }
1114         default:
1115                 return -EOPNOTSUPP;
1116         }
1117 }
1118
1119 static const char *const sfp_hwmon_power_labels[] = {
1120         "TX_power",
1121         "RX_power",
1122 };
1123
1124 static int sfp_hwmon_read_string(struct device *dev,
1125                                  enum hwmon_sensor_types type,
1126                                  u32 attr, int channel, const char **str)
1127 {
1128         switch (type) {
1129         case hwmon_curr:
1130                 switch (attr) {
1131                 case hwmon_curr_label:
1132                         *str = "bias";
1133                         return 0;
1134                 default:
1135                         return -EOPNOTSUPP;
1136                 }
1137                 break;
1138         case hwmon_temp:
1139                 switch (attr) {
1140                 case hwmon_temp_label:
1141                         *str = "temperature";
1142                         return 0;
1143                 default:
1144                         return -EOPNOTSUPP;
1145                 }
1146                 break;
1147         case hwmon_in:
1148                 switch (attr) {
1149                 case hwmon_in_label:
1150                         *str = "VCC";
1151                         return 0;
1152                 default:
1153                         return -EOPNOTSUPP;
1154                 }
1155                 break;
1156         case hwmon_power:
1157                 switch (attr) {
1158                 case hwmon_power_label:
1159                         *str = sfp_hwmon_power_labels[channel];
1160                         return 0;
1161                 default:
1162                         return -EOPNOTSUPP;
1163                 }
1164                 break;
1165         default:
1166                 return -EOPNOTSUPP;
1167         }
1168
1169         return -EOPNOTSUPP;
1170 }
1171
1172 static const struct hwmon_ops sfp_hwmon_ops = {
1173         .is_visible = sfp_hwmon_is_visible,
1174         .read = sfp_hwmon_read,
1175         .read_string = sfp_hwmon_read_string,
1176 };
1177
1178 static u32 sfp_hwmon_chip_config[] = {
1179         HWMON_C_REGISTER_TZ,
1180         0,
1181 };
1182
1183 static const struct hwmon_channel_info sfp_hwmon_chip = {
1184         .type = hwmon_chip,
1185         .config = sfp_hwmon_chip_config,
1186 };
1187
1188 static u32 sfp_hwmon_temp_config[] = {
1189         HWMON_T_INPUT |
1190         HWMON_T_MAX | HWMON_T_MIN |
1191         HWMON_T_MAX_ALARM | HWMON_T_MIN_ALARM |
1192         HWMON_T_CRIT | HWMON_T_LCRIT |
1193         HWMON_T_CRIT_ALARM | HWMON_T_LCRIT_ALARM |
1194         HWMON_T_LABEL,
1195         0,
1196 };
1197
1198 static const struct hwmon_channel_info sfp_hwmon_temp_channel_info = {
1199         .type = hwmon_temp,
1200         .config = sfp_hwmon_temp_config,
1201 };
1202
1203 static u32 sfp_hwmon_vcc_config[] = {
1204         HWMON_I_INPUT |
1205         HWMON_I_MAX | HWMON_I_MIN |
1206         HWMON_I_MAX_ALARM | HWMON_I_MIN_ALARM |
1207         HWMON_I_CRIT | HWMON_I_LCRIT |
1208         HWMON_I_CRIT_ALARM | HWMON_I_LCRIT_ALARM |
1209         HWMON_I_LABEL,
1210         0,
1211 };
1212
1213 static const struct hwmon_channel_info sfp_hwmon_vcc_channel_info = {
1214         .type = hwmon_in,
1215         .config = sfp_hwmon_vcc_config,
1216 };
1217
1218 static u32 sfp_hwmon_bias_config[] = {
1219         HWMON_C_INPUT |
1220         HWMON_C_MAX | HWMON_C_MIN |
1221         HWMON_C_MAX_ALARM | HWMON_C_MIN_ALARM |
1222         HWMON_C_CRIT | HWMON_C_LCRIT |
1223         HWMON_C_CRIT_ALARM | HWMON_C_LCRIT_ALARM |
1224         HWMON_C_LABEL,
1225         0,
1226 };
1227
1228 static const struct hwmon_channel_info sfp_hwmon_bias_channel_info = {
1229         .type = hwmon_curr,
1230         .config = sfp_hwmon_bias_config,
1231 };
1232
1233 static u32 sfp_hwmon_power_config[] = {
1234         /* Transmit power */
1235         HWMON_P_INPUT |
1236         HWMON_P_MAX | HWMON_P_MIN |
1237         HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
1238         HWMON_P_CRIT | HWMON_P_LCRIT |
1239         HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM |
1240         HWMON_P_LABEL,
1241         /* Receive power */
1242         HWMON_P_INPUT |
1243         HWMON_P_MAX | HWMON_P_MIN |
1244         HWMON_P_MAX_ALARM | HWMON_P_MIN_ALARM |
1245         HWMON_P_CRIT | HWMON_P_LCRIT |
1246         HWMON_P_CRIT_ALARM | HWMON_P_LCRIT_ALARM |
1247         HWMON_P_LABEL,
1248         0,
1249 };
1250
1251 static const struct hwmon_channel_info sfp_hwmon_power_channel_info = {
1252         .type = hwmon_power,
1253         .config = sfp_hwmon_power_config,
1254 };
1255
1256 static const struct hwmon_channel_info *sfp_hwmon_info[] = {
1257         &sfp_hwmon_chip,
1258         &sfp_hwmon_vcc_channel_info,
1259         &sfp_hwmon_temp_channel_info,
1260         &sfp_hwmon_bias_channel_info,
1261         &sfp_hwmon_power_channel_info,
1262         NULL,
1263 };
1264
1265 static const struct hwmon_chip_info sfp_hwmon_chip_info = {
1266         .ops = &sfp_hwmon_ops,
1267         .info = sfp_hwmon_info,
1268 };
1269
1270 static void sfp_hwmon_probe(struct work_struct *work)
1271 {
1272         struct sfp *sfp = container_of(work, struct sfp, hwmon_probe.work);
1273         int err, i;
1274
1275         err = sfp_read(sfp, true, 0, &sfp->diag, sizeof(sfp->diag));
1276         if (err < 0) {
1277                 if (sfp->hwmon_tries--) {
1278                         mod_delayed_work(system_wq, &sfp->hwmon_probe,
1279                                          T_PROBE_RETRY_SLOW);
1280                 } else {
1281                         dev_warn(sfp->dev, "hwmon probe failed: %d\n", err);
1282                 }
1283                 return;
1284         }
1285
1286         sfp->hwmon_name = kstrdup(dev_name(sfp->dev), GFP_KERNEL);
1287         if (!sfp->hwmon_name) {
1288                 dev_err(sfp->dev, "out of memory for hwmon name\n");
1289                 return;
1290         }
1291
1292         for (i = 0; sfp->hwmon_name[i]; i++)
1293                 if (hwmon_is_bad_char(sfp->hwmon_name[i]))
1294                         sfp->hwmon_name[i] = '_';
1295
1296         sfp->hwmon_dev = hwmon_device_register_with_info(sfp->dev,
1297                                                          sfp->hwmon_name, sfp,
1298                                                          &sfp_hwmon_chip_info,
1299                                                          NULL);
1300         if (IS_ERR(sfp->hwmon_dev))
1301                 dev_err(sfp->dev, "failed to register hwmon device: %ld\n",
1302                         PTR_ERR(sfp->hwmon_dev));
1303 }
1304
1305 static int sfp_hwmon_insert(struct sfp *sfp)
1306 {
1307         if (sfp->id.ext.sff8472_compliance == SFP_SFF8472_COMPLIANCE_NONE)
1308                 return 0;
1309
1310         if (!(sfp->id.ext.diagmon & SFP_DIAGMON_DDM))
1311                 return 0;
1312
1313         if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
1314                 /* This driver in general does not support address
1315                  * change.
1316                  */
1317                 return 0;
1318
1319         mod_delayed_work(system_wq, &sfp->hwmon_probe, 1);
1320         sfp->hwmon_tries = R_PROBE_RETRY_SLOW;
1321
1322         return 0;
1323 }
1324
1325 static void sfp_hwmon_remove(struct sfp *sfp)
1326 {
1327         cancel_delayed_work_sync(&sfp->hwmon_probe);
1328         if (!IS_ERR_OR_NULL(sfp->hwmon_dev)) {
1329                 hwmon_device_unregister(sfp->hwmon_dev);
1330                 sfp->hwmon_dev = NULL;
1331                 kfree(sfp->hwmon_name);
1332         }
1333 }
1334
1335 static int sfp_hwmon_init(struct sfp *sfp)
1336 {
1337         INIT_DELAYED_WORK(&sfp->hwmon_probe, sfp_hwmon_probe);
1338
1339         return 0;
1340 }
1341
1342 static void sfp_hwmon_exit(struct sfp *sfp)
1343 {
1344         cancel_delayed_work_sync(&sfp->hwmon_probe);
1345 }
1346 #else
1347 static int sfp_hwmon_insert(struct sfp *sfp)
1348 {
1349         return 0;
1350 }
1351
1352 static void sfp_hwmon_remove(struct sfp *sfp)
1353 {
1354 }
1355
1356 static int sfp_hwmon_init(struct sfp *sfp)
1357 {
1358         return 0;
1359 }
1360
1361 static void sfp_hwmon_exit(struct sfp *sfp)
1362 {
1363 }
1364 #endif
1365
1366 /* Helpers */
1367 static void sfp_module_tx_disable(struct sfp *sfp)
1368 {
1369         dev_dbg(sfp->dev, "tx disable %u -> %u\n",
1370                 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 1);
1371         sfp->state |= SFP_F_TX_DISABLE;
1372         sfp_set_state(sfp, sfp->state);
1373 }
1374
1375 static void sfp_module_tx_enable(struct sfp *sfp)
1376 {
1377         dev_dbg(sfp->dev, "tx disable %u -> %u\n",
1378                 sfp->state & SFP_F_TX_DISABLE ? 1 : 0, 0);
1379         sfp->state &= ~SFP_F_TX_DISABLE;
1380         sfp_set_state(sfp, sfp->state);
1381 }
1382
1383 static void sfp_module_tx_fault_reset(struct sfp *sfp)
1384 {
1385         unsigned int state = sfp->state;
1386
1387         if (state & SFP_F_TX_DISABLE)
1388                 return;
1389
1390         sfp_set_state(sfp, state | SFP_F_TX_DISABLE);
1391
1392         udelay(T_RESET_US);
1393
1394         sfp_set_state(sfp, state);
1395 }
1396
1397 /* SFP state machine */
1398 static void sfp_sm_set_timer(struct sfp *sfp, unsigned int timeout)
1399 {
1400         if (timeout)
1401                 mod_delayed_work(system_power_efficient_wq, &sfp->timeout,
1402                                  timeout);
1403         else
1404                 cancel_delayed_work(&sfp->timeout);
1405 }
1406
1407 static void sfp_sm_next(struct sfp *sfp, unsigned int state,
1408                         unsigned int timeout)
1409 {
1410         sfp->sm_state = state;
1411         sfp_sm_set_timer(sfp, timeout);
1412 }
1413
1414 static void sfp_sm_mod_next(struct sfp *sfp, unsigned int state,
1415                             unsigned int timeout)
1416 {
1417         sfp->sm_mod_state = state;
1418         sfp_sm_set_timer(sfp, timeout);
1419 }
1420
1421 static void sfp_sm_phy_detach(struct sfp *sfp)
1422 {
1423         sfp_remove_phy(sfp->sfp_bus);
1424         phy_device_remove(sfp->mod_phy);
1425         phy_device_free(sfp->mod_phy);
1426         sfp->mod_phy = NULL;
1427 }
1428
1429 static int sfp_sm_probe_phy(struct sfp *sfp, bool is_c45)
1430 {
1431         struct phy_device *phy;
1432         int err;
1433
1434         phy = get_phy_device(sfp->i2c_mii, SFP_PHY_ADDR, is_c45);
1435         if (phy == ERR_PTR(-ENODEV))
1436                 return PTR_ERR(phy);
1437         if (IS_ERR(phy)) {
1438                 dev_err(sfp->dev, "mdiobus scan returned %ld\n", PTR_ERR(phy));
1439                 return PTR_ERR(phy);
1440         }
1441
1442         err = phy_device_register(phy);
1443         if (err) {
1444                 phy_device_free(phy);
1445                 dev_err(sfp->dev, "phy_device_register failed: %d\n", err);
1446                 return err;
1447         }
1448
1449         err = sfp_add_phy(sfp->sfp_bus, phy);
1450         if (err) {
1451                 phy_device_remove(phy);
1452                 phy_device_free(phy);
1453                 dev_err(sfp->dev, "sfp_add_phy failed: %d\n", err);
1454                 return err;
1455         }
1456
1457         sfp->mod_phy = phy;
1458
1459         return 0;
1460 }
1461
1462 static void sfp_sm_link_up(struct sfp *sfp)
1463 {
1464         sfp_link_up(sfp->sfp_bus);
1465         sfp_sm_next(sfp, SFP_S_LINK_UP, 0);
1466 }
1467
1468 static void sfp_sm_link_down(struct sfp *sfp)
1469 {
1470         sfp_link_down(sfp->sfp_bus);
1471 }
1472
1473 static void sfp_sm_link_check_los(struct sfp *sfp)
1474 {
1475         unsigned int los = sfp->state & SFP_F_LOS;
1476
1477         /* If neither SFP_OPTIONS_LOS_INVERTED nor SFP_OPTIONS_LOS_NORMAL
1478          * are set, we assume that no LOS signal is available.
1479          */
1480         if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED))
1481                 los ^= SFP_F_LOS;
1482         else if (!(sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL)))
1483                 los = 0;
1484
1485         if (los)
1486                 sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
1487         else
1488                 sfp_sm_link_up(sfp);
1489 }
1490
1491 static bool sfp_los_event_active(struct sfp *sfp, unsigned int event)
1492 {
1493         return (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED) &&
1494                 event == SFP_E_LOS_LOW) ||
1495                (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL) &&
1496                 event == SFP_E_LOS_HIGH);
1497 }
1498
1499 static bool sfp_los_event_inactive(struct sfp *sfp, unsigned int event)
1500 {
1501         return (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_INVERTED) &&
1502                 event == SFP_E_LOS_HIGH) ||
1503                (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_LOS_NORMAL) &&
1504                 event == SFP_E_LOS_LOW);
1505 }
1506
1507 static void sfp_sm_fault(struct sfp *sfp, unsigned int next_state, bool warn)
1508 {
1509         if (sfp->sm_fault_retries && !--sfp->sm_fault_retries) {
1510                 dev_err(sfp->dev,
1511                         "module persistently indicates fault, disabling\n");
1512                 sfp_sm_next(sfp, SFP_S_TX_DISABLE, 0);
1513         } else {
1514                 if (warn)
1515                         dev_err(sfp->dev, "module transmit fault indicated\n");
1516
1517                 sfp_sm_next(sfp, next_state, T_FAULT_RECOVER);
1518         }
1519 }
1520
1521 /* Probe a SFP for a PHY device if the module supports copper - the PHY
1522  * normally sits at I2C bus address 0x56, and may either be a clause 22
1523  * or clause 45 PHY.
1524  *
1525  * Clause 22 copper SFP modules normally operate in Cisco SGMII mode with
1526  * negotiation enabled, but some may be in 1000base-X - which is for the
1527  * PHY driver to determine.
1528  *
1529  * Clause 45 copper SFP+ modules (10G) appear to switch their interface
1530  * mode according to the negotiated line speed.
1531  */
1532 static int sfp_sm_probe_for_phy(struct sfp *sfp)
1533 {
1534         int err = 0;
1535
1536         switch (sfp->id.base.extended_cc) {
1537         case SFF8024_ECC_10GBASE_T_SFI:
1538         case SFF8024_ECC_10GBASE_T_SR:
1539         case SFF8024_ECC_5GBASE_T:
1540         case SFF8024_ECC_2_5GBASE_T:
1541                 err = sfp_sm_probe_phy(sfp, true);
1542                 break;
1543
1544         default:
1545                 if (sfp->id.base.e1000_base_t)
1546                         err = sfp_sm_probe_phy(sfp, false);
1547                 break;
1548         }
1549         return err;
1550 }
1551
1552 static int sfp_module_parse_power(struct sfp *sfp)
1553 {
1554         u32 power_mW = 1000;
1555
1556         if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_POWER_DECL))
1557                 power_mW = 1500;
1558         if (sfp->id.ext.options & cpu_to_be16(SFP_OPTIONS_HIGH_POWER_LEVEL))
1559                 power_mW = 2000;
1560
1561         if (power_mW > sfp->max_power_mW) {
1562                 /* Module power specification exceeds the allowed maximum. */
1563                 if (sfp->id.ext.sff8472_compliance ==
1564                         SFP_SFF8472_COMPLIANCE_NONE &&
1565                     !(sfp->id.ext.diagmon & SFP_DIAGMON_DDM)) {
1566                         /* The module appears not to implement bus address
1567                          * 0xa2, so assume that the module powers up in the
1568                          * indicated mode.
1569                          */
1570                         dev_err(sfp->dev,
1571                                 "Host does not support %u.%uW modules\n",
1572                                 power_mW / 1000, (power_mW / 100) % 10);
1573                         return -EINVAL;
1574                 } else {
1575                         dev_warn(sfp->dev,
1576                                  "Host does not support %u.%uW modules, module left in power mode 1\n",
1577                                  power_mW / 1000, (power_mW / 100) % 10);
1578                         return 0;
1579                 }
1580         }
1581
1582         /* If the module requires a higher power mode, but also requires
1583          * an address change sequence, warn the user that the module may
1584          * not be functional.
1585          */
1586         if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE && power_mW > 1000) {
1587                 dev_warn(sfp->dev,
1588                          "Address Change Sequence not supported but module requires %u.%uW, module may not be functional\n",
1589                          power_mW / 1000, (power_mW / 100) % 10);
1590                 return 0;
1591         }
1592
1593         sfp->module_power_mW = power_mW;
1594
1595         return 0;
1596 }
1597
1598 static int sfp_sm_mod_hpower(struct sfp *sfp, bool enable)
1599 {
1600         u8 val;
1601         int err;
1602
1603         err = sfp_read(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
1604         if (err != sizeof(val)) {
1605                 dev_err(sfp->dev, "Failed to read EEPROM: %d\n", err);
1606                 return -EAGAIN;
1607         }
1608
1609         /* DM7052 reports as a high power module, responds to reads (with
1610          * all bytes 0xff) at 0x51 but does not accept writes.  In any case,
1611          * if the bit is already set, we're already in high power mode.
1612          */
1613         if (!!(val & BIT(0)) == enable)
1614                 return 0;
1615
1616         if (enable)
1617                 val |= BIT(0);
1618         else
1619                 val &= ~BIT(0);
1620
1621         err = sfp_write(sfp, true, SFP_EXT_STATUS, &val, sizeof(val));
1622         if (err != sizeof(val)) {
1623                 dev_err(sfp->dev, "Failed to write EEPROM: %d\n", err);
1624                 return -EAGAIN;
1625         }
1626
1627         if (enable)
1628                 dev_info(sfp->dev, "Module switched to %u.%uW power level\n",
1629                          sfp->module_power_mW / 1000,
1630                          (sfp->module_power_mW / 100) % 10);
1631
1632         return 0;
1633 }
1634
1635 static int sfp_cotsworks_fixup_check(struct sfp *sfp, struct sfp_eeprom_id *id)
1636 {
1637         u8 check;
1638         int err;
1639
1640         if (id->base.phys_id != SFF8024_ID_SFF_8472 ||
1641             id->base.phys_ext_id != SFP_PHYS_EXT_ID_SFP ||
1642             id->base.connector != SFF8024_CONNECTOR_LC) {
1643                 dev_warn(sfp->dev, "Rewriting fiber module EEPROM with corrected values\n");
1644                 id->base.phys_id = SFF8024_ID_SFF_8472;
1645                 id->base.phys_ext_id = SFP_PHYS_EXT_ID_SFP;
1646                 id->base.connector = SFF8024_CONNECTOR_LC;
1647                 err = sfp_write(sfp, false, SFP_PHYS_ID, &id->base, 3);
1648                 if (err != 3) {
1649                         dev_err(sfp->dev, "Failed to rewrite module EEPROM: %d\n", err);
1650                         return err;
1651                 }
1652
1653                 /* Cotsworks modules have been found to require a delay between write operations. */
1654                 mdelay(50);
1655
1656                 /* Update base structure checksum */
1657                 check = sfp_check(&id->base, sizeof(id->base) - 1);
1658                 err = sfp_write(sfp, false, SFP_CC_BASE, &check, 1);
1659                 if (err != 1) {
1660                         dev_err(sfp->dev, "Failed to update base structure checksum in fiber module EEPROM: %d\n", err);
1661                         return err;
1662                 }
1663         }
1664         return 0;
1665 }
1666
1667 static int sfp_sm_mod_probe(struct sfp *sfp, bool report)
1668 {
1669         /* SFP module inserted - read I2C data */
1670         struct sfp_eeprom_id id;
1671         bool cotsworks_sfbg;
1672         bool cotsworks;
1673         u8 check;
1674         int ret;
1675
1676         ret = sfp_read(sfp, false, 0, &id, sizeof(id));
1677         if (ret < 0) {
1678                 if (report)
1679                         dev_err(sfp->dev, "failed to read EEPROM: %d\n", ret);
1680                 return -EAGAIN;
1681         }
1682
1683         if (ret != sizeof(id)) {
1684                 dev_err(sfp->dev, "EEPROM short read: %d\n", ret);
1685                 return -EAGAIN;
1686         }
1687
1688         /* Cotsworks do not seem to update the checksums when they
1689          * do the final programming with the final module part number,
1690          * serial number and date code.
1691          */
1692         cotsworks = !memcmp(id.base.vendor_name, "COTSWORKS       ", 16);
1693         cotsworks_sfbg = !memcmp(id.base.vendor_pn, "SFBG", 4);
1694
1695         /* Cotsworks SFF module EEPROM do not always have valid phys_id,
1696          * phys_ext_id, and connector bytes.  Rewrite SFF EEPROM bytes if
1697          * Cotsworks PN matches and bytes are not correct.
1698          */
1699         if (cotsworks && cotsworks_sfbg) {
1700                 ret = sfp_cotsworks_fixup_check(sfp, &id);
1701                 if (ret < 0)
1702                         return ret;
1703         }
1704
1705         /* Validate the checksum over the base structure */
1706         check = sfp_check(&id.base, sizeof(id.base) - 1);
1707         if (check != id.base.cc_base) {
1708                 if (cotsworks) {
1709                         dev_warn(sfp->dev,
1710                                  "EEPROM base structure checksum failure (0x%02x != 0x%02x)\n",
1711                                  check, id.base.cc_base);
1712                 } else {
1713                         dev_err(sfp->dev,
1714                                 "EEPROM base structure checksum failure: 0x%02x != 0x%02x\n",
1715                                 check, id.base.cc_base);
1716                         print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
1717                                        16, 1, &id, sizeof(id), true);
1718                         return -EINVAL;
1719                 }
1720         }
1721
1722         check = sfp_check(&id.ext, sizeof(id.ext) - 1);
1723         if (check != id.ext.cc_ext) {
1724                 if (cotsworks) {
1725                         dev_warn(sfp->dev,
1726                                  "EEPROM extended structure checksum failure (0x%02x != 0x%02x)\n",
1727                                  check, id.ext.cc_ext);
1728                 } else {
1729                         dev_err(sfp->dev,
1730                                 "EEPROM extended structure checksum failure: 0x%02x != 0x%02x\n",
1731                                 check, id.ext.cc_ext);
1732                         print_hex_dump(KERN_ERR, "sfp EE: ", DUMP_PREFIX_OFFSET,
1733                                        16, 1, &id, sizeof(id), true);
1734                         memset(&id.ext, 0, sizeof(id.ext));
1735                 }
1736         }
1737
1738         sfp->id = id;
1739
1740         dev_info(sfp->dev, "module %.*s %.*s rev %.*s sn %.*s dc %.*s\n",
1741                  (int)sizeof(id.base.vendor_name), id.base.vendor_name,
1742                  (int)sizeof(id.base.vendor_pn), id.base.vendor_pn,
1743                  (int)sizeof(id.base.vendor_rev), id.base.vendor_rev,
1744                  (int)sizeof(id.ext.vendor_sn), id.ext.vendor_sn,
1745                  (int)sizeof(id.ext.datecode), id.ext.datecode);
1746
1747         /* Check whether we support this module */
1748         if (!sfp->type->module_supported(&id)) {
1749                 dev_err(sfp->dev,
1750                         "module is not supported - phys id 0x%02x 0x%02x\n",
1751                         sfp->id.base.phys_id, sfp->id.base.phys_ext_id);
1752                 return -EINVAL;
1753         }
1754
1755         /* If the module requires address swap mode, warn about it */
1756         if (sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)
1757                 dev_warn(sfp->dev,
1758                          "module address swap to access page 0xA2 is not supported.\n");
1759
1760         /* Parse the module power requirement */
1761         ret = sfp_module_parse_power(sfp);
1762         if (ret < 0)
1763                 return ret;
1764
1765         if (!memcmp(id.base.vendor_name, "ALCATELLUCENT   ", 16) &&
1766             !memcmp(id.base.vendor_pn, "3FE46541AA      ", 16))
1767                 sfp->module_t_start_up = T_START_UP_BAD_GPON;
1768         else
1769                 sfp->module_t_start_up = T_START_UP;
1770
1771         return 0;
1772 }
1773
1774 static void sfp_sm_mod_remove(struct sfp *sfp)
1775 {
1776         if (sfp->sm_mod_state > SFP_MOD_WAITDEV)
1777                 sfp_module_remove(sfp->sfp_bus);
1778
1779         sfp_hwmon_remove(sfp);
1780
1781         memset(&sfp->id, 0, sizeof(sfp->id));
1782         sfp->module_power_mW = 0;
1783
1784         dev_info(sfp->dev, "module removed\n");
1785 }
1786
1787 /* This state machine tracks the upstream's state */
1788 static void sfp_sm_device(struct sfp *sfp, unsigned int event)
1789 {
1790         switch (sfp->sm_dev_state) {
1791         default:
1792                 if (event == SFP_E_DEV_ATTACH)
1793                         sfp->sm_dev_state = SFP_DEV_DOWN;
1794                 break;
1795
1796         case SFP_DEV_DOWN:
1797                 if (event == SFP_E_DEV_DETACH)
1798                         sfp->sm_dev_state = SFP_DEV_DETACHED;
1799                 else if (event == SFP_E_DEV_UP)
1800                         sfp->sm_dev_state = SFP_DEV_UP;
1801                 break;
1802
1803         case SFP_DEV_UP:
1804                 if (event == SFP_E_DEV_DETACH)
1805                         sfp->sm_dev_state = SFP_DEV_DETACHED;
1806                 else if (event == SFP_E_DEV_DOWN)
1807                         sfp->sm_dev_state = SFP_DEV_DOWN;
1808                 break;
1809         }
1810 }
1811
1812 /* This state machine tracks the insert/remove state of the module, probes
1813  * the on-board EEPROM, and sets up the power level.
1814  */
1815 static void sfp_sm_module(struct sfp *sfp, unsigned int event)
1816 {
1817         int err;
1818
1819         /* Handle remove event globally, it resets this state machine */
1820         if (event == SFP_E_REMOVE) {
1821                 if (sfp->sm_mod_state > SFP_MOD_PROBE)
1822                         sfp_sm_mod_remove(sfp);
1823                 sfp_sm_mod_next(sfp, SFP_MOD_EMPTY, 0);
1824                 return;
1825         }
1826
1827         /* Handle device detach globally */
1828         if (sfp->sm_dev_state < SFP_DEV_DOWN &&
1829             sfp->sm_mod_state > SFP_MOD_WAITDEV) {
1830                 if (sfp->module_power_mW > 1000 &&
1831                     sfp->sm_mod_state > SFP_MOD_HPOWER)
1832                         sfp_sm_mod_hpower(sfp, false);
1833                 sfp_sm_mod_next(sfp, SFP_MOD_WAITDEV, 0);
1834                 return;
1835         }
1836
1837         switch (sfp->sm_mod_state) {
1838         default:
1839                 if (event == SFP_E_INSERT) {
1840                         sfp_sm_mod_next(sfp, SFP_MOD_PROBE, T_SERIAL);
1841                         sfp->sm_mod_tries_init = R_PROBE_RETRY_INIT;
1842                         sfp->sm_mod_tries = R_PROBE_RETRY_SLOW;
1843                 }
1844                 break;
1845
1846         case SFP_MOD_PROBE:
1847                 /* Wait for T_PROBE_INIT to time out */
1848                 if (event != SFP_E_TIMEOUT)
1849                         break;
1850
1851                 err = sfp_sm_mod_probe(sfp, sfp->sm_mod_tries == 1);
1852                 if (err == -EAGAIN) {
1853                         if (sfp->sm_mod_tries_init &&
1854                            --sfp->sm_mod_tries_init) {
1855                                 sfp_sm_set_timer(sfp, T_PROBE_RETRY_INIT);
1856                                 break;
1857                         } else if (sfp->sm_mod_tries && --sfp->sm_mod_tries) {
1858                                 if (sfp->sm_mod_tries == R_PROBE_RETRY_SLOW - 1)
1859                                         dev_warn(sfp->dev,
1860                                                  "please wait, module slow to respond\n");
1861                                 sfp_sm_set_timer(sfp, T_PROBE_RETRY_SLOW);
1862                                 break;
1863                         }
1864                 }
1865                 if (err < 0) {
1866                         sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0);
1867                         break;
1868                 }
1869
1870                 err = sfp_hwmon_insert(sfp);
1871                 if (err)
1872                         dev_warn(sfp->dev, "hwmon probe failed: %d\n", err);
1873
1874                 sfp_sm_mod_next(sfp, SFP_MOD_WAITDEV, 0);
1875                 fallthrough;
1876         case SFP_MOD_WAITDEV:
1877                 /* Ensure that the device is attached before proceeding */
1878                 if (sfp->sm_dev_state < SFP_DEV_DOWN)
1879                         break;
1880
1881                 /* Report the module insertion to the upstream device */
1882                 err = sfp_module_insert(sfp->sfp_bus, &sfp->id);
1883                 if (err < 0) {
1884                         sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0);
1885                         break;
1886                 }
1887
1888                 /* If this is a power level 1 module, we are done */
1889                 if (sfp->module_power_mW <= 1000)
1890                         goto insert;
1891
1892                 sfp_sm_mod_next(sfp, SFP_MOD_HPOWER, 0);
1893                 fallthrough;
1894         case SFP_MOD_HPOWER:
1895                 /* Enable high power mode */
1896                 err = sfp_sm_mod_hpower(sfp, true);
1897                 if (err < 0) {
1898                         if (err != -EAGAIN) {
1899                                 sfp_module_remove(sfp->sfp_bus);
1900                                 sfp_sm_mod_next(sfp, SFP_MOD_ERROR, 0);
1901                         } else {
1902                                 sfp_sm_set_timer(sfp, T_PROBE_RETRY_INIT);
1903                         }
1904                         break;
1905                 }
1906
1907                 sfp_sm_mod_next(sfp, SFP_MOD_WAITPWR, T_HPOWER_LEVEL);
1908                 break;
1909
1910         case SFP_MOD_WAITPWR:
1911                 /* Wait for T_HPOWER_LEVEL to time out */
1912                 if (event != SFP_E_TIMEOUT)
1913                         break;
1914
1915         insert:
1916                 sfp_sm_mod_next(sfp, SFP_MOD_PRESENT, 0);
1917                 break;
1918
1919         case SFP_MOD_PRESENT:
1920         case SFP_MOD_ERROR:
1921                 break;
1922         }
1923 }
1924
1925 static void sfp_sm_main(struct sfp *sfp, unsigned int event)
1926 {
1927         unsigned long timeout;
1928         int ret;
1929
1930         /* Some events are global */
1931         if (sfp->sm_state != SFP_S_DOWN &&
1932             (sfp->sm_mod_state != SFP_MOD_PRESENT ||
1933              sfp->sm_dev_state != SFP_DEV_UP)) {
1934                 if (sfp->sm_state == SFP_S_LINK_UP &&
1935                     sfp->sm_dev_state == SFP_DEV_UP)
1936                         sfp_sm_link_down(sfp);
1937                 if (sfp->sm_state > SFP_S_INIT)
1938                         sfp_module_stop(sfp->sfp_bus);
1939                 if (sfp->mod_phy)
1940                         sfp_sm_phy_detach(sfp);
1941                 sfp_module_tx_disable(sfp);
1942                 sfp_soft_stop_poll(sfp);
1943                 sfp_sm_next(sfp, SFP_S_DOWN, 0);
1944                 return;
1945         }
1946
1947         /* The main state machine */
1948         switch (sfp->sm_state) {
1949         case SFP_S_DOWN:
1950                 if (sfp->sm_mod_state != SFP_MOD_PRESENT ||
1951                     sfp->sm_dev_state != SFP_DEV_UP)
1952                         break;
1953
1954                 if (!(sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE))
1955                         sfp_soft_start_poll(sfp);
1956
1957                 sfp_module_tx_enable(sfp);
1958
1959                 /* Initialise the fault clearance retries */
1960                 sfp->sm_fault_retries = N_FAULT_INIT;
1961
1962                 /* We need to check the TX_FAULT state, which is not defined
1963                  * while TX_DISABLE is asserted. The earliest we want to do
1964                  * anything (such as probe for a PHY) is 50ms.
1965                  */
1966                 sfp_sm_next(sfp, SFP_S_WAIT, T_WAIT);
1967                 break;
1968
1969         case SFP_S_WAIT:
1970                 if (event != SFP_E_TIMEOUT)
1971                         break;
1972
1973                 if (sfp->state & SFP_F_TX_FAULT) {
1974                         /* Wait up to t_init (SFF-8472) or t_start_up (SFF-8431)
1975                          * from the TX_DISABLE deassertion for the module to
1976                          * initialise, which is indicated by TX_FAULT
1977                          * deasserting.
1978                          */
1979                         timeout = sfp->module_t_start_up;
1980                         if (timeout > T_WAIT)
1981                                 timeout -= T_WAIT;
1982                         else
1983                                 timeout = 1;
1984
1985                         sfp_sm_next(sfp, SFP_S_INIT, timeout);
1986                 } else {
1987                         /* TX_FAULT is not asserted, assume the module has
1988                          * finished initialising.
1989                          */
1990                         goto init_done;
1991                 }
1992                 break;
1993
1994         case SFP_S_INIT:
1995                 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) {
1996                         /* TX_FAULT is still asserted after t_init or
1997                          * or t_start_up, so assume there is a fault.
1998                          */
1999                         sfp_sm_fault(sfp, SFP_S_INIT_TX_FAULT,
2000                                      sfp->sm_fault_retries == N_FAULT_INIT);
2001                 } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) {
2002         init_done:
2003                         sfp->sm_phy_retries = R_PHY_RETRY;
2004                         goto phy_probe;
2005                 }
2006                 break;
2007
2008         case SFP_S_INIT_PHY:
2009                 if (event != SFP_E_TIMEOUT)
2010                         break;
2011         phy_probe:
2012                 /* TX_FAULT deasserted or we timed out with TX_FAULT
2013                  * clear.  Probe for the PHY and check the LOS state.
2014                  */
2015                 ret = sfp_sm_probe_for_phy(sfp);
2016                 if (ret == -ENODEV) {
2017                         if (--sfp->sm_phy_retries) {
2018                                 sfp_sm_next(sfp, SFP_S_INIT_PHY, T_PHY_RETRY);
2019                                 break;
2020                         } else {
2021                                 dev_info(sfp->dev, "no PHY detected\n");
2022                         }
2023                 } else if (ret) {
2024                         sfp_sm_next(sfp, SFP_S_FAIL, 0);
2025                         break;
2026                 }
2027                 if (sfp_module_start(sfp->sfp_bus)) {
2028                         sfp_sm_next(sfp, SFP_S_FAIL, 0);
2029                         break;
2030                 }
2031                 sfp_sm_link_check_los(sfp);
2032
2033                 /* Reset the fault retry count */
2034                 sfp->sm_fault_retries = N_FAULT;
2035                 break;
2036
2037         case SFP_S_INIT_TX_FAULT:
2038                 if (event == SFP_E_TIMEOUT) {
2039                         sfp_module_tx_fault_reset(sfp);
2040                         sfp_sm_next(sfp, SFP_S_INIT, sfp->module_t_start_up);
2041                 }
2042                 break;
2043
2044         case SFP_S_WAIT_LOS:
2045                 if (event == SFP_E_TX_FAULT)
2046                         sfp_sm_fault(sfp, SFP_S_TX_FAULT, true);
2047                 else if (sfp_los_event_inactive(sfp, event))
2048                         sfp_sm_link_up(sfp);
2049                 break;
2050
2051         case SFP_S_LINK_UP:
2052                 if (event == SFP_E_TX_FAULT) {
2053                         sfp_sm_link_down(sfp);
2054                         sfp_sm_fault(sfp, SFP_S_TX_FAULT, true);
2055                 } else if (sfp_los_event_active(sfp, event)) {
2056                         sfp_sm_link_down(sfp);
2057                         sfp_sm_next(sfp, SFP_S_WAIT_LOS, 0);
2058                 }
2059                 break;
2060
2061         case SFP_S_TX_FAULT:
2062                 if (event == SFP_E_TIMEOUT) {
2063                         sfp_module_tx_fault_reset(sfp);
2064                         sfp_sm_next(sfp, SFP_S_REINIT, sfp->module_t_start_up);
2065                 }
2066                 break;
2067
2068         case SFP_S_REINIT:
2069                 if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) {
2070                         sfp_sm_fault(sfp, SFP_S_TX_FAULT, false);
2071                 } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) {
2072                         dev_info(sfp->dev, "module transmit fault recovered\n");
2073                         sfp_sm_link_check_los(sfp);
2074                 }
2075                 break;
2076
2077         case SFP_S_TX_DISABLE:
2078                 break;
2079         }
2080 }
2081
2082 static void sfp_sm_event(struct sfp *sfp, unsigned int event)
2083 {
2084         mutex_lock(&sfp->sm_mutex);
2085
2086         dev_dbg(sfp->dev, "SM: enter %s:%s:%s event %s\n",
2087                 mod_state_to_str(sfp->sm_mod_state),
2088                 dev_state_to_str(sfp->sm_dev_state),
2089                 sm_state_to_str(sfp->sm_state),
2090                 event_to_str(event));
2091
2092         sfp_sm_device(sfp, event);
2093         sfp_sm_module(sfp, event);
2094         sfp_sm_main(sfp, event);
2095
2096         dev_dbg(sfp->dev, "SM: exit %s:%s:%s\n",
2097                 mod_state_to_str(sfp->sm_mod_state),
2098                 dev_state_to_str(sfp->sm_dev_state),
2099                 sm_state_to_str(sfp->sm_state));
2100
2101         mutex_unlock(&sfp->sm_mutex);
2102 }
2103
2104 static void sfp_attach(struct sfp *sfp)
2105 {
2106         sfp_sm_event(sfp, SFP_E_DEV_ATTACH);
2107 }
2108
2109 static void sfp_detach(struct sfp *sfp)
2110 {
2111         sfp_sm_event(sfp, SFP_E_DEV_DETACH);
2112 }
2113
2114 static void sfp_start(struct sfp *sfp)
2115 {
2116         sfp_sm_event(sfp, SFP_E_DEV_UP);
2117 }
2118
2119 static void sfp_stop(struct sfp *sfp)
2120 {
2121         sfp_sm_event(sfp, SFP_E_DEV_DOWN);
2122 }
2123
2124 static int sfp_module_info(struct sfp *sfp, struct ethtool_modinfo *modinfo)
2125 {
2126         /* locking... and check module is present */
2127
2128         if (sfp->id.ext.sff8472_compliance &&
2129             !(sfp->id.ext.diagmon & SFP_DIAGMON_ADDRMODE)) {
2130                 modinfo->type = ETH_MODULE_SFF_8472;
2131                 modinfo->eeprom_len = ETH_MODULE_SFF_8472_LEN;
2132         } else {
2133                 modinfo->type = ETH_MODULE_SFF_8079;
2134                 modinfo->eeprom_len = ETH_MODULE_SFF_8079_LEN;
2135         }
2136         return 0;
2137 }
2138
2139 static int sfp_module_eeprom(struct sfp *sfp, struct ethtool_eeprom *ee,
2140                              u8 *data)
2141 {
2142         unsigned int first, last, len;
2143         int ret;
2144
2145         if (ee->len == 0)
2146                 return -EINVAL;
2147
2148         first = ee->offset;
2149         last = ee->offset + ee->len;
2150         if (first < ETH_MODULE_SFF_8079_LEN) {
2151                 len = min_t(unsigned int, last, ETH_MODULE_SFF_8079_LEN);
2152                 len -= first;
2153
2154                 ret = sfp_read(sfp, false, first, data, len);
2155                 if (ret < 0)
2156                         return ret;
2157
2158                 first += len;
2159                 data += len;
2160         }
2161         if (first < ETH_MODULE_SFF_8472_LEN && last > ETH_MODULE_SFF_8079_LEN) {
2162                 len = min_t(unsigned int, last, ETH_MODULE_SFF_8472_LEN);
2163                 len -= first;
2164                 first -= ETH_MODULE_SFF_8079_LEN;
2165
2166                 ret = sfp_read(sfp, true, first, data, len);
2167                 if (ret < 0)
2168                         return ret;
2169         }
2170         return 0;
2171 }
2172
2173 static const struct sfp_socket_ops sfp_module_ops = {
2174         .attach = sfp_attach,
2175         .detach = sfp_detach,
2176         .start = sfp_start,
2177         .stop = sfp_stop,
2178         .module_info = sfp_module_info,
2179         .module_eeprom = sfp_module_eeprom,
2180 };
2181
2182 static void sfp_timeout(struct work_struct *work)
2183 {
2184         struct sfp *sfp = container_of(work, struct sfp, timeout.work);
2185
2186         rtnl_lock();
2187         sfp_sm_event(sfp, SFP_E_TIMEOUT);
2188         rtnl_unlock();
2189 }
2190
2191 static void sfp_check_state(struct sfp *sfp)
2192 {
2193         unsigned int state, i, changed;
2194
2195         mutex_lock(&sfp->st_mutex);
2196         state = sfp_get_state(sfp);
2197         changed = state ^ sfp->state;
2198         changed &= SFP_F_PRESENT | SFP_F_LOS | SFP_F_TX_FAULT;
2199
2200         for (i = 0; i < GPIO_MAX; i++)
2201                 if (changed & BIT(i))
2202                         dev_dbg(sfp->dev, "%s %u -> %u\n", gpio_of_names[i],
2203                                 !!(sfp->state & BIT(i)), !!(state & BIT(i)));
2204
2205         state |= sfp->state & (SFP_F_TX_DISABLE | SFP_F_RATE_SELECT);
2206         sfp->state = state;
2207
2208         rtnl_lock();
2209         if (changed & SFP_F_PRESENT)
2210                 sfp_sm_event(sfp, state & SFP_F_PRESENT ?
2211                                 SFP_E_INSERT : SFP_E_REMOVE);
2212
2213         if (changed & SFP_F_TX_FAULT)
2214                 sfp_sm_event(sfp, state & SFP_F_TX_FAULT ?
2215                                 SFP_E_TX_FAULT : SFP_E_TX_CLEAR);
2216
2217         if (changed & SFP_F_LOS)
2218                 sfp_sm_event(sfp, state & SFP_F_LOS ?
2219                                 SFP_E_LOS_HIGH : SFP_E_LOS_LOW);
2220         rtnl_unlock();
2221         mutex_unlock(&sfp->st_mutex);
2222 }
2223
2224 static irqreturn_t sfp_irq(int irq, void *data)
2225 {
2226         struct sfp *sfp = data;
2227
2228         sfp_check_state(sfp);
2229
2230         return IRQ_HANDLED;
2231 }
2232
2233 static void sfp_poll(struct work_struct *work)
2234 {
2235         struct sfp *sfp = container_of(work, struct sfp, poll.work);
2236
2237         sfp_check_state(sfp);
2238
2239         if (sfp->state_soft_mask & (SFP_F_LOS | SFP_F_TX_FAULT) ||
2240             sfp->need_poll)
2241                 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
2242 }
2243
2244 static struct sfp *sfp_alloc(struct device *dev)
2245 {
2246         struct sfp *sfp;
2247
2248         sfp = kzalloc(sizeof(*sfp), GFP_KERNEL);
2249         if (!sfp)
2250                 return ERR_PTR(-ENOMEM);
2251
2252         sfp->dev = dev;
2253
2254         mutex_init(&sfp->sm_mutex);
2255         mutex_init(&sfp->st_mutex);
2256         INIT_DELAYED_WORK(&sfp->poll, sfp_poll);
2257         INIT_DELAYED_WORK(&sfp->timeout, sfp_timeout);
2258
2259         sfp_hwmon_init(sfp);
2260
2261         return sfp;
2262 }
2263
2264 static void sfp_cleanup(void *data)
2265 {
2266         struct sfp *sfp = data;
2267
2268         sfp_hwmon_exit(sfp);
2269
2270         cancel_delayed_work_sync(&sfp->poll);
2271         cancel_delayed_work_sync(&sfp->timeout);
2272         if (sfp->i2c_mii) {
2273                 mdiobus_unregister(sfp->i2c_mii);
2274                 mdiobus_free(sfp->i2c_mii);
2275         }
2276         if (sfp->i2c)
2277                 i2c_put_adapter(sfp->i2c);
2278         kfree(sfp);
2279 }
2280
2281 static int sfp_probe(struct platform_device *pdev)
2282 {
2283         const struct sff_data *sff;
2284         struct i2c_adapter *i2c;
2285         char *sfp_irq_name;
2286         struct sfp *sfp;
2287         int err, i;
2288
2289         sfp = sfp_alloc(&pdev->dev);
2290         if (IS_ERR(sfp))
2291                 return PTR_ERR(sfp);
2292
2293         platform_set_drvdata(pdev, sfp);
2294
2295         err = devm_add_action(sfp->dev, sfp_cleanup, sfp);
2296         if (err < 0)
2297                 return err;
2298
2299         sff = sfp->type = &sfp_data;
2300
2301         if (pdev->dev.of_node) {
2302                 struct device_node *node = pdev->dev.of_node;
2303                 const struct of_device_id *id;
2304                 struct device_node *np;
2305
2306                 id = of_match_node(sfp_of_match, node);
2307                 if (WARN_ON(!id))
2308                         return -EINVAL;
2309
2310                 sff = sfp->type = id->data;
2311
2312                 np = of_parse_phandle(node, "i2c-bus", 0);
2313                 if (!np) {
2314                         dev_err(sfp->dev, "missing 'i2c-bus' property\n");
2315                         return -ENODEV;
2316                 }
2317
2318                 i2c = of_find_i2c_adapter_by_node(np);
2319                 of_node_put(np);
2320         } else if (has_acpi_companion(&pdev->dev)) {
2321                 struct acpi_device *adev = ACPI_COMPANION(&pdev->dev);
2322                 struct fwnode_handle *fw = acpi_fwnode_handle(adev);
2323                 struct fwnode_reference_args args;
2324                 struct acpi_handle *acpi_handle;
2325                 int ret;
2326
2327                 ret = acpi_node_get_property_reference(fw, "i2c-bus", 0, &args);
2328                 if (ret || !is_acpi_device_node(args.fwnode)) {
2329                         dev_err(&pdev->dev, "missing 'i2c-bus' property\n");
2330                         return -ENODEV;
2331                 }
2332
2333                 acpi_handle = ACPI_HANDLE_FWNODE(args.fwnode);
2334                 i2c = i2c_acpi_find_adapter_by_handle(acpi_handle);
2335         } else {
2336                 return -EINVAL;
2337         }
2338
2339         if (!i2c)
2340                 return -EPROBE_DEFER;
2341
2342         err = sfp_i2c_configure(sfp, i2c);
2343         if (err < 0) {
2344                 i2c_put_adapter(i2c);
2345                 return err;
2346         }
2347
2348         for (i = 0; i < GPIO_MAX; i++)
2349                 if (sff->gpios & BIT(i)) {
2350                         sfp->gpio[i] = devm_gpiod_get_optional(sfp->dev,
2351                                            gpio_of_names[i], gpio_flags[i]);
2352                         if (IS_ERR(sfp->gpio[i]))
2353                                 return PTR_ERR(sfp->gpio[i]);
2354                 }
2355
2356         sfp->get_state = sfp_gpio_get_state;
2357         sfp->set_state = sfp_gpio_set_state;
2358
2359         /* Modules that have no detect signal are always present */
2360         if (!(sfp->gpio[GPIO_MODDEF0]))
2361                 sfp->get_state = sff_gpio_get_state;
2362
2363         device_property_read_u32(&pdev->dev, "maximum-power-milliwatt",
2364                                  &sfp->max_power_mW);
2365         if (!sfp->max_power_mW)
2366                 sfp->max_power_mW = 1000;
2367
2368         dev_info(sfp->dev, "Host maximum power %u.%uW\n",
2369                  sfp->max_power_mW / 1000, (sfp->max_power_mW / 100) % 10);
2370
2371         /* Get the initial state, and always signal TX disable,
2372          * since the network interface will not be up.
2373          */
2374         sfp->state = sfp_get_state(sfp) | SFP_F_TX_DISABLE;
2375
2376         if (sfp->gpio[GPIO_RATE_SELECT] &&
2377             gpiod_get_value_cansleep(sfp->gpio[GPIO_RATE_SELECT]))
2378                 sfp->state |= SFP_F_RATE_SELECT;
2379         sfp_set_state(sfp, sfp->state);
2380         sfp_module_tx_disable(sfp);
2381         if (sfp->state & SFP_F_PRESENT) {
2382                 rtnl_lock();
2383                 sfp_sm_event(sfp, SFP_E_INSERT);
2384                 rtnl_unlock();
2385         }
2386
2387         for (i = 0; i < GPIO_MAX; i++) {
2388                 if (gpio_flags[i] != GPIOD_IN || !sfp->gpio[i])
2389                         continue;
2390
2391                 sfp->gpio_irq[i] = gpiod_to_irq(sfp->gpio[i]);
2392                 if (!sfp->gpio_irq[i]) {
2393                         sfp->need_poll = true;
2394                         continue;
2395                 }
2396
2397                 sfp_irq_name = devm_kasprintf(sfp->dev, GFP_KERNEL,
2398                                               "%s-%s", dev_name(sfp->dev),
2399                                               gpio_of_names[i]);
2400
2401                 if (!sfp_irq_name)
2402                         return -ENOMEM;
2403
2404                 err = devm_request_threaded_irq(sfp->dev, sfp->gpio_irq[i],
2405                                                 NULL, sfp_irq,
2406                                                 IRQF_ONESHOT |
2407                                                 IRQF_TRIGGER_RISING |
2408                                                 IRQF_TRIGGER_FALLING,
2409                                                 sfp_irq_name, sfp);
2410                 if (err) {
2411                         sfp->gpio_irq[i] = 0;
2412                         sfp->need_poll = true;
2413                 }
2414         }
2415
2416         if (sfp->need_poll)
2417                 mod_delayed_work(system_wq, &sfp->poll, poll_jiffies);
2418
2419         /* We could have an issue in cases no Tx disable pin is available or
2420          * wired as modules using a laser as their light source will continue to
2421          * be active when the fiber is removed. This could be a safety issue and
2422          * we should at least warn the user about that.
2423          */
2424         if (!sfp->gpio[GPIO_TX_DISABLE])
2425                 dev_warn(sfp->dev,
2426                          "No tx_disable pin: SFP modules will always be emitting.\n");
2427
2428         sfp->sfp_bus = sfp_register_socket(sfp->dev, sfp, &sfp_module_ops);
2429         if (!sfp->sfp_bus)
2430                 return -ENOMEM;
2431
2432         return 0;
2433 }
2434
2435 static int sfp_remove(struct platform_device *pdev)
2436 {
2437         struct sfp *sfp = platform_get_drvdata(pdev);
2438
2439         sfp_unregister_socket(sfp->sfp_bus);
2440
2441         rtnl_lock();
2442         sfp_sm_event(sfp, SFP_E_REMOVE);
2443         rtnl_unlock();
2444
2445         return 0;
2446 }
2447
2448 static void sfp_shutdown(struct platform_device *pdev)
2449 {
2450         struct sfp *sfp = platform_get_drvdata(pdev);
2451         int i;
2452
2453         for (i = 0; i < GPIO_MAX; i++) {
2454                 if (!sfp->gpio_irq[i])
2455                         continue;
2456
2457                 devm_free_irq(sfp->dev, sfp->gpio_irq[i], sfp);
2458         }
2459
2460         cancel_delayed_work_sync(&sfp->poll);
2461         cancel_delayed_work_sync(&sfp->timeout);
2462 }
2463
2464 static struct platform_driver sfp_driver = {
2465         .probe = sfp_probe,
2466         .remove = sfp_remove,
2467         .shutdown = sfp_shutdown,
2468         .driver = {
2469                 .name = "sfp",
2470                 .of_match_table = sfp_of_match,
2471         },
2472 };
2473
2474 static int sfp_init(void)
2475 {
2476         poll_jiffies = msecs_to_jiffies(100);
2477
2478         return platform_driver_register(&sfp_driver);
2479 }
2480 module_init(sfp_init);
2481
2482 static void sfp_exit(void)
2483 {
2484         platform_driver_unregister(&sfp_driver);
2485 }
2486 module_exit(sfp_exit);
2487
2488 MODULE_ALIAS("platform:sfp");
2489 MODULE_AUTHOR("Russell King");
2490 MODULE_LICENSE("GPL v2");