drivers/input/misc/iqs626a.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Azoteq IQS626A Capacitive Touch Controller
   4  *
   5  * Copyright (C) 2020 Jeff LaBundy <jeff@labundy.com>
   6  *
   7  * This driver registers up to 2 input devices: one representing capacitive or
   8  * inductive keys as well as Hall-effect switches, and one for a trackpad that
   9  * can express various gestures.
  10  */
  11
  12 #include <linux/bits.h>
  13 #include <linux/completion.h>
  14 #include <linux/delay.h>
  15 #include <linux/device.h>
  16 #include <linux/err.h>
  17 #include <linux/i2c.h>
  18 #include <linux/input.h>
  19 #include <linux/input/touchscreen.h>
  20 #include <linux/interrupt.h>
  21 #include <linux/kernel.h>
  22 #include <linux/mod_devicetable.h>
  23 #include <linux/module.h>
  24 #include <linux/property.h>
  25 #include <linux/regmap.h>
  26 #include <linux/slab.h>
  27
  28 #define IQS626_VER_INFO                         0x00
  29 #define IQS626_VER_INFO_PROD_NUM                0x51
  30
  31 #define IQS626_SYS_FLAGS                        0x02
  32 #define IQS626_SYS_FLAGS_SHOW_RESET             BIT(15)
  33 #define IQS626_SYS_FLAGS_IN_ATI                 BIT(12)
  34 #define IQS626_SYS_FLAGS_PWR_MODE_MASK          GENMASK(9, 8)
  35 #define IQS626_SYS_FLAGS_PWR_MODE_SHIFT         8
  36
  37 #define IQS626_HALL_OUTPUT                      0x23
  38
  39 #define IQS626_SYS_SETTINGS                     0x80
  40 #define IQS626_SYS_SETTINGS_CLK_DIV             BIT(15)
  41 #define IQS626_SYS_SETTINGS_ULP_AUTO            BIT(14)
  42 #define IQS626_SYS_SETTINGS_DIS_AUTO            BIT(13)
  43 #define IQS626_SYS_SETTINGS_PWR_MODE_MASK       GENMASK(12, 11)
  44 #define IQS626_SYS_SETTINGS_PWR_MODE_SHIFT      11
  45 #define IQS626_SYS_SETTINGS_PWR_MODE_MAX        3
  46 #define IQS626_SYS_SETTINGS_ULP_UPDATE_MASK     GENMASK(10, 8)
  47 #define IQS626_SYS_SETTINGS_ULP_UPDATE_SHIFT    8
  48 #define IQS626_SYS_SETTINGS_ULP_UPDATE_MAX      7
  49 #define IQS626_SYS_SETTINGS_EVENT_MODE          BIT(5)
  50 #define IQS626_SYS_SETTINGS_EVENT_MODE_LP       BIT(4)
  51 #define IQS626_SYS_SETTINGS_REDO_ATI            BIT(2)
  52 #define IQS626_SYS_SETTINGS_ACK_RESET           BIT(0)
  53
  54 #define IQS626_MISC_A_ATI_BAND_DISABLE          BIT(7)
  55 #define IQS626_MISC_A_TPx_LTA_UPDATE_MASK       GENMASK(6, 4)
  56 #define IQS626_MISC_A_TPx_LTA_UPDATE_SHIFT      4
  57 #define IQS626_MISC_A_TPx_LTA_UPDATE_MAX        7
  58 #define IQS626_MISC_A_ATI_LP_ONLY               BIT(3)
  59 #define IQS626_MISC_A_GPIO3_SELECT_MASK         GENMASK(2, 0)
  60 #define IQS626_MISC_A_GPIO3_SELECT_MAX          7
  61
  62 #define IQS626_EVENT_MASK_SYS                   BIT(6)
  63 #define IQS626_EVENT_MASK_GESTURE               BIT(3)
  64 #define IQS626_EVENT_MASK_DEEP                  BIT(2)
  65 #define IQS626_EVENT_MASK_TOUCH                 BIT(1)
  66 #define IQS626_EVENT_MASK_PROX                  BIT(0)
  67
  68 #define IQS626_RATE_NP_MS_MAX                   255
  69 #define IQS626_RATE_LP_MS_MAX                   255
  70 #define IQS626_RATE_ULP_MS_MAX                  4080
  71 #define IQS626_TIMEOUT_PWR_MS_MAX               130560
  72 #define IQS626_TIMEOUT_LTA_MS_MAX               130560
  73
  74 #define IQS626_MISC_B_RESEED_UI_SEL_MASK        GENMASK(7, 6)
  75 #define IQS626_MISC_B_RESEED_UI_SEL_SHIFT       6
  76 #define IQS626_MISC_B_RESEED_UI_SEL_MAX         3
  77 #define IQS626_MISC_B_THRESH_EXTEND             BIT(5)
  78 #define IQS626_MISC_B_TRACKING_UI_ENABLE        BIT(4)
  79 #define IQS626_MISC_B_TPx_SWIPE                 BIT(3)
  80 #define IQS626_MISC_B_RESEED_OFFSET             BIT(2)
  81 #define IQS626_MISC_B_FILT_STR_TPx              GENMASK(1, 0)
  82
  83 #define IQS626_THRESH_SWIPE_MAX                 255
  84 #define IQS626_TIMEOUT_TAP_MS_MAX               4080
  85 #define IQS626_TIMEOUT_SWIPE_MS_MAX             4080
  86
  87 #define IQS626_CHx_ENG_0_MEAS_CAP_SIZE          BIT(7)
  88 #define IQS626_CHx_ENG_0_RX_TERM_VSS            BIT(5)
  89 #define IQS626_CHx_ENG_0_LINEARIZE              BIT(4)
  90 #define IQS626_CHx_ENG_0_DUAL_DIR               BIT(3)
  91 #define IQS626_CHx_ENG_0_FILT_DISABLE           BIT(2)
  92 #define IQS626_CHx_ENG_0_ATI_MODE_MASK          GENMASK(1, 0)
  93 #define IQS626_CHx_ENG_0_ATI_MODE_MAX           3
  94
  95 #define IQS626_CHx_ENG_1_CCT_HIGH_1             BIT(7)
  96 #define IQS626_CHx_ENG_1_CCT_HIGH_0             BIT(6)
  97 #define IQS626_CHx_ENG_1_PROJ_BIAS_MASK         GENMASK(5, 4)
  98 #define IQS626_CHx_ENG_1_PROJ_BIAS_SHIFT        4
  99 #define IQS626_CHx_ENG_1_PROJ_BIAS_MAX          3
 100 #define IQS626_CHx_ENG_1_CCT_ENABLE             BIT(3)
 101 #define IQS626_CHx_ENG_1_SENSE_FREQ_MASK        GENMASK(2, 1)
 102 #define IQS626_CHx_ENG_1_SENSE_FREQ_SHIFT       1
 103 #define IQS626_CHx_ENG_1_SENSE_FREQ_MAX         3
 104 #define IQS626_CHx_ENG_1_ATI_BAND_TIGHTEN       BIT(0)
 105
 106 #define IQS626_CHx_ENG_2_LOCAL_CAP_MASK         GENMASK(7, 6)
 107 #define IQS626_CHx_ENG_2_LOCAL_CAP_SHIFT        6
 108 #define IQS626_CHx_ENG_2_LOCAL_CAP_MAX          3
 109 #define IQS626_CHx_ENG_2_LOCAL_CAP_ENABLE       BIT(5)
 110 #define IQS626_CHx_ENG_2_SENSE_MODE_MASK        GENMASK(3, 0)
 111 #define IQS626_CHx_ENG_2_SENSE_MODE_MAX         15
 112
 113 #define IQS626_CHx_ENG_3_TX_FREQ_MASK           GENMASK(5, 4)
 114 #define IQS626_CHx_ENG_3_TX_FREQ_SHIFT          4
 115 #define IQS626_CHx_ENG_3_TX_FREQ_MAX            3
 116 #define IQS626_CHx_ENG_3_INV_LOGIC              BIT(0)
 117
 118 #define IQS626_CHx_ENG_4_RX_TERM_VREG           BIT(6)
 119 #define IQS626_CHx_ENG_4_CCT_LOW_1              BIT(5)
 120 #define IQS626_CHx_ENG_4_CCT_LOW_0              BIT(4)
 121 #define IQS626_CHx_ENG_4_COMP_DISABLE           BIT(1)
 122 #define IQS626_CHx_ENG_4_STATIC_ENABLE          BIT(0)
 123
 124 #define IQS626_TPx_ATI_BASE_MIN                 45
 125 #define IQS626_TPx_ATI_BASE_MAX                 300
 126 #define IQS626_CHx_ATI_BASE_MASK                GENMASK(7, 6)
 127 #define IQS626_CHx_ATI_BASE_75                  0x00
 128 #define IQS626_CHx_ATI_BASE_100                 0x40
 129 #define IQS626_CHx_ATI_BASE_150                 0x80
 130 #define IQS626_CHx_ATI_BASE_200                 0xC0
 131 #define IQS626_CHx_ATI_TARGET_MASK              GENMASK(5, 0)
 132 #define IQS626_CHx_ATI_TARGET_MAX               2016
 133
 134 #define IQS626_CHx_THRESH_MAX                   255
 135 #define IQS626_CHx_HYST_DEEP_MASK               GENMASK(7, 4)
 136 #define IQS626_CHx_HYST_DEEP_SHIFT              4
 137 #define IQS626_CHx_HYST_TOUCH_MASK              GENMASK(3, 0)
 138 #define IQS626_CHx_HYST_MAX                     15
 139
 140 #define IQS626_FILT_STR_NP_TPx_MASK             GENMASK(7, 6)
 141 #define IQS626_FILT_STR_NP_TPx_SHIFT            6
 142 #define IQS626_FILT_STR_LP_TPx_MASK             GENMASK(5, 4)
 143 #define IQS626_FILT_STR_LP_TPx_SHIFT            4
 144
 145 #define IQS626_FILT_STR_NP_CNT_MASK             GENMASK(7, 6)
 146 #define IQS626_FILT_STR_NP_CNT_SHIFT            6
 147 #define IQS626_FILT_STR_LP_CNT_MASK             GENMASK(5, 4)
 148 #define IQS626_FILT_STR_LP_CNT_SHIFT            4
 149 #define IQS626_FILT_STR_NP_LTA_MASK             GENMASK(3, 2)
 150 #define IQS626_FILT_STR_NP_LTA_SHIFT            2
 151 #define IQS626_FILT_STR_LP_LTA_MASK             GENMASK(1, 0)
 152 #define IQS626_FILT_STR_MAX                     3
 153
 154 #define IQS626_ULP_PROJ_ENABLE                  BIT(4)
 155 #define IQS626_GEN_WEIGHT_MAX                   255
 156
 157 #define IQS626_MAX_REG                          0xFF
 158
 159 #define IQS626_NUM_CH_TP_3                      9
 160 #define IQS626_NUM_CH_TP_2                      6
 161 #define IQS626_NUM_CH_GEN                       3
 162 #define IQS626_NUM_CRx_TX                       8
 163
 164 #define IQS626_PWR_MODE_POLL_SLEEP_US           50000
 165 #define IQS626_PWR_MODE_POLL_TIMEOUT_US         500000
 166
 167 #define iqs626_irq_wait()                       usleep_range(350, 400)
 168
 169 enum iqs626_ch_id {
 170         IQS626_CH_ULP_0,
 171         IQS626_CH_TP_2,
 172         IQS626_CH_TP_3,
 173         IQS626_CH_GEN_0,
 174         IQS626_CH_GEN_1,
 175         IQS626_CH_GEN_2,
 176         IQS626_CH_HALL,
 177 };
 178
 179 enum iqs626_rx_inactive {
 180         IQS626_RX_INACTIVE_VSS,
 181         IQS626_RX_INACTIVE_FLOAT,
 182         IQS626_RX_INACTIVE_VREG,
 183 };
 184
 185 enum iqs626_st_offs {
 186         IQS626_ST_OFFS_PROX,
 187         IQS626_ST_OFFS_DIR,
 188         IQS626_ST_OFFS_TOUCH,
 189         IQS626_ST_OFFS_DEEP,
 190 };
 191
 192 enum iqs626_th_offs {
 193         IQS626_TH_OFFS_PROX,
 194         IQS626_TH_OFFS_TOUCH,
 195         IQS626_TH_OFFS_DEEP,
 196 };
 197
 198 enum iqs626_event_id {
 199         IQS626_EVENT_PROX_DN,
 200         IQS626_EVENT_PROX_UP,
 201         IQS626_EVENT_TOUCH_DN,
 202         IQS626_EVENT_TOUCH_UP,
 203         IQS626_EVENT_DEEP_DN,
 204         IQS626_EVENT_DEEP_UP,
 205 };
 206
 207 enum iqs626_gesture_id {
 208         IQS626_GESTURE_FLICK_X_POS,
 209         IQS626_GESTURE_FLICK_X_NEG,
 210         IQS626_GESTURE_FLICK_Y_POS,
 211         IQS626_GESTURE_FLICK_Y_NEG,
 212         IQS626_GESTURE_TAP,
 213         IQS626_GESTURE_HOLD,
 214         IQS626_NUM_GESTURES,
 215 };
 216
 217 struct iqs626_event_desc {
 218         const char *name;
 219         enum iqs626_st_offs st_offs;
 220         enum iqs626_th_offs th_offs;
 221         bool dir_up;
 222         u8 mask;
 223 };
 224
 225 static const struct iqs626_event_desc iqs626_events[] = {
 226         [IQS626_EVENT_PROX_DN] = {
 227                 .name = "event-prox",
 228                 .st_offs = IQS626_ST_OFFS_PROX,
 229                 .th_offs = IQS626_TH_OFFS_PROX,
 230                 .mask = IQS626_EVENT_MASK_PROX,
 231         },
 232         [IQS626_EVENT_PROX_UP] = {
 233                 .name = "event-prox-alt",
 234                 .st_offs = IQS626_ST_OFFS_PROX,
 235                 .th_offs = IQS626_TH_OFFS_PROX,
 236                 .dir_up = true,
 237                 .mask = IQS626_EVENT_MASK_PROX,
 238         },
 239         [IQS626_EVENT_TOUCH_DN] = {
 240                 .name = "event-touch",
 241                 .st_offs = IQS626_ST_OFFS_TOUCH,
 242                 .th_offs = IQS626_TH_OFFS_TOUCH,
 243                 .mask = IQS626_EVENT_MASK_TOUCH,
 244         },
 245         [IQS626_EVENT_TOUCH_UP] = {
 246                 .name = "event-touch-alt",
 247                 .st_offs = IQS626_ST_OFFS_TOUCH,
 248                 .th_offs = IQS626_TH_OFFS_TOUCH,
 249                 .dir_up = true,
 250                 .mask = IQS626_EVENT_MASK_TOUCH,
 251         },
 252         [IQS626_EVENT_DEEP_DN] = {
 253                 .name = "event-deep",
 254                 .st_offs = IQS626_ST_OFFS_DEEP,
 255                 .th_offs = IQS626_TH_OFFS_DEEP,
 256                 .mask = IQS626_EVENT_MASK_DEEP,
 257         },
 258         [IQS626_EVENT_DEEP_UP] = {
 259                 .name = "event-deep-alt",
 260                 .st_offs = IQS626_ST_OFFS_DEEP,
 261                 .th_offs = IQS626_TH_OFFS_DEEP,
 262                 .dir_up = true,
 263                 .mask = IQS626_EVENT_MASK_DEEP,
 264         },
 265 };
 266
 267 struct iqs626_ver_info {
 268         u8 prod_num;
 269         u8 sw_num;
 270         u8 hw_num;
 271         u8 padding;
 272 } __packed;
 273
 274 struct iqs626_flags {
 275         __be16 system;
 276         u8 gesture;
 277         u8 padding_a;
 278         u8 states[4];
 279         u8 ref_active;
 280         u8 padding_b;
 281         u8 comp_min;
 282         u8 comp_max;
 283         u8 trackpad_x;
 284         u8 trackpad_y;
 285 } __packed;
 286
 287 struct iqs626_ch_reg_ulp {
 288         u8 thresh[2];
 289         u8 hyst;
 290         u8 filter;
 291         u8 engine[2];
 292         u8 ati_target;
 293         u8 padding;
 294         __be16 ati_comp;
 295         u8 rx_enable;
 296         u8 tx_enable;
 297 } __packed;
 298
 299 struct iqs626_ch_reg_tp {
 300         u8 thresh;
 301         u8 ati_base;
 302         __be16 ati_comp;
 303 } __packed;
 304
 305 struct iqs626_tp_grp_reg {
 306         u8 hyst;
 307         u8 ati_target;
 308         u8 engine[2];
 309         struct iqs626_ch_reg_tp ch_reg_tp[IQS626_NUM_CH_TP_3];
 310 } __packed;
 311
 312 struct iqs626_ch_reg_gen {
 313         u8 thresh[3];
 314         u8 padding;
 315         u8 hyst;
 316         u8 ati_target;
 317         __be16 ati_comp;
 318         u8 engine[5];
 319         u8 filter;
 320         u8 rx_enable;
 321         u8 tx_enable;
 322         u8 assoc_select;
 323         u8 assoc_weight;
 324 } __packed;
 325
 326 struct iqs626_ch_reg_hall {
 327         u8 engine;
 328         u8 thresh;
 329         u8 hyst;
 330         u8 ati_target;
 331         __be16 ati_comp;
 332 } __packed;
 333
 334 struct iqs626_sys_reg {
 335         __be16 general;
 336         u8 misc_a;
 337         u8 event_mask;
 338         u8 active;
 339         u8 reseed;
 340         u8 rate_np;
 341         u8 rate_lp;
 342         u8 rate_ulp;
 343         u8 timeout_pwr;
 344         u8 timeout_rdy;
 345         u8 timeout_lta;
 346         u8 misc_b;
 347         u8 thresh_swipe;
 348         u8 timeout_tap;
 349         u8 timeout_swipe;
 350         u8 redo_ati;
 351         u8 padding;
 352         struct iqs626_ch_reg_ulp ch_reg_ulp;
 353         struct iqs626_tp_grp_reg tp_grp_reg;
 354         struct iqs626_ch_reg_gen ch_reg_gen[IQS626_NUM_CH_GEN];
 355         struct iqs626_ch_reg_hall ch_reg_hall;
 356 } __packed;
 357
 358 struct iqs626_channel_desc {
 359         const char *name;
 360         int num_ch;
 361         u8 active;
 362         bool events[ARRAY_SIZE(iqs626_events)];
 363 };
 364
 365 static const struct iqs626_channel_desc iqs626_channels[] = {
 366         [IQS626_CH_ULP_0] = {
 367                 .name = "ulp-0",
 368                 .num_ch = 1,
 369                 .active = BIT(0),
 370                 .events = {
 371                         [IQS626_EVENT_PROX_DN] = true,
 372                         [IQS626_EVENT_PROX_UP] = true,
 373                         [IQS626_EVENT_TOUCH_DN] = true,
 374                         [IQS626_EVENT_TOUCH_UP] = true,
 375                 },
 376         },
 377         [IQS626_CH_TP_2] = {
 378                 .name = "trackpad-3x2",
 379                 .num_ch = IQS626_NUM_CH_TP_2,
 380                 .active = BIT(1),
 381                 .events = {
 382                         [IQS626_EVENT_TOUCH_DN] = true,
 383                 },
 384         },
 385         [IQS626_CH_TP_3] = {
 386                 .name = "trackpad-3x3",
 387                 .num_ch = IQS626_NUM_CH_TP_3,
 388                 .active = BIT(2) | BIT(1),
 389                 .events = {
 390                         [IQS626_EVENT_TOUCH_DN] = true,
 391                 },
 392         },
 393         [IQS626_CH_GEN_0] = {
 394                 .name = "generic-0",
 395                 .num_ch = 1,
 396                 .active = BIT(4),
 397                 .events = {
 398                         [IQS626_EVENT_PROX_DN] = true,
 399                         [IQS626_EVENT_PROX_UP] = true,
 400                         [IQS626_EVENT_TOUCH_DN] = true,
 401                         [IQS626_EVENT_TOUCH_UP] = true,
 402                         [IQS626_EVENT_DEEP_DN] = true,
 403                         [IQS626_EVENT_DEEP_UP] = true,
 404                 },
 405         },
 406         [IQS626_CH_GEN_1] = {
 407                 .name = "generic-1",
 408                 .num_ch = 1,
 409                 .active = BIT(5),
 410                 .events = {
 411                         [IQS626_EVENT_PROX_DN] = true,
 412                         [IQS626_EVENT_PROX_UP] = true,
 413                         [IQS626_EVENT_TOUCH_DN] = true,
 414                         [IQS626_EVENT_TOUCH_UP] = true,
 415                         [IQS626_EVENT_DEEP_DN] = true,
 416                         [IQS626_EVENT_DEEP_UP] = true,
 417                 },
 418         },
 419         [IQS626_CH_GEN_2] = {
 420                 .name = "generic-2",
 421                 .num_ch = 1,
 422                 .active = BIT(6),
 423                 .events = {
 424                         [IQS626_EVENT_PROX_DN] = true,
 425                         [IQS626_EVENT_PROX_UP] = true,
 426                         [IQS626_EVENT_TOUCH_DN] = true,
 427                         [IQS626_EVENT_TOUCH_UP] = true,
 428                         [IQS626_EVENT_DEEP_DN] = true,
 429                         [IQS626_EVENT_DEEP_UP] = true,
 430                 },
 431         },
 432         [IQS626_CH_HALL] = {
 433                 .name = "hall",
 434                 .num_ch = 1,
 435                 .active = BIT(7),
 436                 .events = {
 437                         [IQS626_EVENT_TOUCH_DN] = true,
 438                         [IQS626_EVENT_TOUCH_UP] = true,
 439                 },
 440         },
 441 };
 442
 443 struct iqs626_private {
 444         struct i2c_client *client;
 445         struct regmap *regmap;
 446         struct iqs626_sys_reg sys_reg;
 447         struct completion ati_done;
 448         struct input_dev *keypad;
 449         struct input_dev *trackpad;
 450         struct touchscreen_properties prop;
 451         unsigned int kp_type[ARRAY_SIZE(iqs626_channels)]
 452                             [ARRAY_SIZE(iqs626_events)];
 453         unsigned int kp_code[ARRAY_SIZE(iqs626_channels)]
 454                             [ARRAY_SIZE(iqs626_events)];
 455         unsigned int tp_code[IQS626_NUM_GESTURES];
 456         unsigned int suspend_mode;
 457 };
 458
 459 static noinline_for_stack int
 460 iqs626_parse_events(struct iqs626_private *iqs626,
 461                     struct fwnode_handle *ch_node, enum iqs626_ch_id ch_id)
 462 {
 463         struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
 464         struct i2c_client *client = iqs626->client;
 465         struct fwnode_handle *ev_node;
 466         const char *ev_name;
 467         u8 *thresh, *hyst;
 468         unsigned int val;
 469         int i;
 470
 471         switch (ch_id) {
 472         case IQS626_CH_ULP_0:
 473                 thresh = sys_reg->ch_reg_ulp.thresh;
 474                 hyst = &sys_reg->ch_reg_ulp.hyst;
 475                 break;
 476
 477         case IQS626_CH_TP_2:
 478         case IQS626_CH_TP_3:
 479                 thresh = &sys_reg->tp_grp_reg.ch_reg_tp[0].thresh;
 480                 hyst = &sys_reg->tp_grp_reg.hyst;
 481                 break;
 482
 483         case IQS626_CH_GEN_0:
 484         case IQS626_CH_GEN_1:
 485         case IQS626_CH_GEN_2:
 486                 i = ch_id - IQS626_CH_GEN_0;
 487                 thresh = sys_reg->ch_reg_gen[i].thresh;
 488                 hyst = &sys_reg->ch_reg_gen[i].hyst;
 489                 break;
 490
 491         case IQS626_CH_HALL:
 492                 thresh = &sys_reg->ch_reg_hall.thresh;
 493                 hyst = &sys_reg->ch_reg_hall.hyst;
 494                 break;
 495
 496         default:
 497                 return -EINVAL;
 498         }
 499
 500         for (i = 0; i < ARRAY_SIZE(iqs626_events); i++) {
 501                 if (!iqs626_channels[ch_id].events[i])
 502                         continue;
 503
 504                 if (ch_id == IQS626_CH_TP_2 || ch_id == IQS626_CH_TP_3) {
 505                         /*
 506                          * Trackpad touch events are simply described under the
 507                          * trackpad child node.
 508                          */
 509                         ev_node = fwnode_handle_get(ch_node);
 510                 } else {
 511                         ev_name = iqs626_events[i].name;
 512                         ev_node = fwnode_get_named_child_node(ch_node, ev_name);
 513                         if (!ev_node)
 514                                 continue;
 515
 516                         if (!fwnode_property_read_u32(ev_node, "linux,code",
 517                                                       &val)) {
 518                                 iqs626->kp_code[ch_id][i] = val;
 519
 520                                 if (fwnode_property_read_u32(ev_node,
 521                                                              "linux,input-type",
 522                                                              &val)) {
 523                                         if (ch_id == IQS626_CH_HALL)
 524                                                 val = EV_SW;
 525                                         else
 526                                                 val = EV_KEY;
 527                                 }
 528
 529                                 if (val != EV_KEY && val != EV_SW) {
 530                                         dev_err(&client->dev,
 531                                                 "Invalid input type: %u\n",
 532                                                 val);
 533                                         fwnode_handle_put(ev_node);
 534                                         return -EINVAL;
 535                                 }
 536
 537                                 iqs626->kp_type[ch_id][i] = val;
 538
 539                                 sys_reg->event_mask &= ~iqs626_events[i].mask;
 540                         }
 541                 }
 542
 543                 if (!fwnode_property_read_u32(ev_node, "azoteq,hyst", &val)) {
 544                         if (val > IQS626_CHx_HYST_MAX) {
 545                                 dev_err(&client->dev,
 546                                         "Invalid %s channel hysteresis: %u\n",
 547                                         fwnode_get_name(ch_node), val);
 548                                 fwnode_handle_put(ev_node);
 549                                 return -EINVAL;
 550                         }
 551
 552                         if (i == IQS626_EVENT_DEEP_DN ||
 553                             i == IQS626_EVENT_DEEP_UP) {
 554                                 *hyst &= ~IQS626_CHx_HYST_DEEP_MASK;
 555                                 *hyst |= (val << IQS626_CHx_HYST_DEEP_SHIFT);
 556                         } else if (i == IQS626_EVENT_TOUCH_DN ||
 557                                    i == IQS626_EVENT_TOUCH_UP) {
 558                                 *hyst &= ~IQS626_CHx_HYST_TOUCH_MASK;
 559                                 *hyst |= val;
 560                         }
 561                 }
 562
 563                 if (ch_id != IQS626_CH_TP_2 && ch_id != IQS626_CH_TP_3 &&
 564                     !fwnode_property_read_u32(ev_node, "azoteq,thresh", &val)) {
 565                         if (val > IQS626_CHx_THRESH_MAX) {
 566                                 dev_err(&client->dev,
 567                                         "Invalid %s channel threshold: %u\n",
 568                                         fwnode_get_name(ch_node), val);
 569                                 fwnode_handle_put(ev_node);
 570                                 return -EINVAL;
 571                         }
 572
 573                         if (ch_id == IQS626_CH_HALL)
 574                                 *thresh = val;
 575                         else
 576                                 *(thresh + iqs626_events[i].th_offs) = val;
 577                 }
 578
 579                 fwnode_handle_put(ev_node);
 580         }
 581
 582         return 0;
 583 }
 584
 585 static noinline_for_stack int
 586 iqs626_parse_ati_target(struct iqs626_private *iqs626,
 587                         struct fwnode_handle *ch_node, enum iqs626_ch_id ch_id)
 588 {
 589         struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
 590         struct i2c_client *client = iqs626->client;
 591         unsigned int val;
 592         u8 *ati_target;
 593         int i;
 594
 595         switch (ch_id) {
 596         case IQS626_CH_ULP_0:
 597                 ati_target = &sys_reg->ch_reg_ulp.ati_target;
 598                 break;
 599
 600         case IQS626_CH_TP_2:
 601         case IQS626_CH_TP_3:
 602                 ati_target = &sys_reg->tp_grp_reg.ati_target;
 603                 break;
 604
 605         case IQS626_CH_GEN_0:
 606         case IQS626_CH_GEN_1:
 607         case IQS626_CH_GEN_2:
 608                 i = ch_id - IQS626_CH_GEN_0;
 609                 ati_target = &sys_reg->ch_reg_gen[i].ati_target;
 610                 break;
 611
 612         case IQS626_CH_HALL:
 613                 ati_target = &sys_reg->ch_reg_hall.ati_target;
 614                 break;
 615
 616         default:
 617                 return -EINVAL;
 618         }
 619
 620         if (!fwnode_property_read_u32(ch_node, "azoteq,ati-target", &val)) {
 621                 if (val > IQS626_CHx_ATI_TARGET_MAX) {
 622                         dev_err(&client->dev,
 623                                 "Invalid %s channel ATI target: %u\n",
 624                                 fwnode_get_name(ch_node), val);
 625                         return -EINVAL;
 626                 }
 627
 628                 *ati_target &= ~IQS626_CHx_ATI_TARGET_MASK;
 629                 *ati_target |= (val / 32);
 630         }
 631
 632         if (ch_id != IQS626_CH_TP_2 && ch_id != IQS626_CH_TP_3 &&
 633             !fwnode_property_read_u32(ch_node, "azoteq,ati-base", &val)) {
 634                 switch (val) {
 635                 case 75:
 636                         val = IQS626_CHx_ATI_BASE_75;
 637                         break;
 638
 639                 case 100:
 640                         val = IQS626_CHx_ATI_BASE_100;
 641                         break;
 642
 643                 case 150:
 644                         val = IQS626_CHx_ATI_BASE_150;
 645                         break;
 646
 647                 case 200:
 648                         val = IQS626_CHx_ATI_BASE_200;
 649                         break;
 650
 651                 default:
 652                         dev_err(&client->dev,
 653                                 "Invalid %s channel ATI base: %u\n",
 654                                 fwnode_get_name(ch_node), val);
 655                         return -EINVAL;
 656                 }
 657
 658                 *ati_target &= ~IQS626_CHx_ATI_BASE_MASK;
 659                 *ati_target |= val;
 660         }
 661
 662         return 0;
 663 }
 664
 665 static int iqs626_parse_pins(struct iqs626_private *iqs626,
 666                              struct fwnode_handle *ch_node,
 667                              const char *propname, u8 *enable)
 668 {
 669         struct i2c_client *client = iqs626->client;
 670         unsigned int val[IQS626_NUM_CRx_TX];
 671         int error, count, i;
 672
 673         if (!fwnode_property_present(ch_node, propname))
 674                 return 0;
 675
 676         count = fwnode_property_count_u32(ch_node, propname);
 677         if (count > IQS626_NUM_CRx_TX) {
 678                 dev_err(&client->dev,
 679                         "Too many %s channel CRX/TX pins present\n",
 680                         fwnode_get_name(ch_node));
 681                 return -EINVAL;
 682         } else if (count < 0) {
 683                 dev_err(&client->dev,
 684                         "Failed to count %s channel CRX/TX pins: %d\n",
 685                         fwnode_get_name(ch_node), count);
 686                 return count;
 687         }
 688
 689         error = fwnode_property_read_u32_array(ch_node, propname, val, count);
 690         if (error) {
 691                 dev_err(&client->dev,
 692                         "Failed to read %s channel CRX/TX pins: %d\n",
 693                         fwnode_get_name(ch_node), error);
 694                 return error;
 695         }
 696
 697         *enable = 0;
 698
 699         for (i = 0; i < count; i++) {
 700                 if (val[i] >= IQS626_NUM_CRx_TX) {
 701                         dev_err(&client->dev,
 702                                 "Invalid %s channel CRX/TX pin: %u\n",
 703                                 fwnode_get_name(ch_node), val[i]);
 704                         return -EINVAL;
 705                 }
 706
 707                 *enable |= BIT(val[i]);
 708         }
 709
 710         return 0;
 711 }
 712
 713 static int iqs626_parse_trackpad(struct iqs626_private *iqs626,
 714                                  struct fwnode_handle *ch_node,
 715                                  enum iqs626_ch_id ch_id)
 716 {
 717         struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
 718         struct i2c_client *client = iqs626->client;
 719         u8 *hyst = &sys_reg->tp_grp_reg.hyst;
 720         int error, count, i;
 721         unsigned int val;
 722
 723         if (!fwnode_property_read_u32(ch_node, "azoteq,lta-update", &val)) {
 724                 if (val > IQS626_MISC_A_TPx_LTA_UPDATE_MAX) {
 725                         dev_err(&client->dev,
 726                                 "Invalid %s channel update rate: %u\n",
 727                                 fwnode_get_name(ch_node), val);
 728                         return -EINVAL;
 729                 }
 730
 731                 sys_reg->misc_a &= ~IQS626_MISC_A_TPx_LTA_UPDATE_MASK;
 732                 sys_reg->misc_a |= (val << IQS626_MISC_A_TPx_LTA_UPDATE_SHIFT);
 733         }
 734
 735         if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-trackpad",
 736                                       &val)) {
 737                 if (val > IQS626_FILT_STR_MAX) {
 738                         dev_err(&client->dev,
 739                                 "Invalid %s channel filter strength: %u\n",
 740                                 fwnode_get_name(ch_node), val);
 741                         return -EINVAL;
 742                 }
 743
 744                 sys_reg->misc_b &= ~IQS626_MISC_B_FILT_STR_TPx;
 745                 sys_reg->misc_b |= val;
 746         }
 747
 748         if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-np-cnt",
 749                                       &val)) {
 750                 if (val > IQS626_FILT_STR_MAX) {
 751                         dev_err(&client->dev,
 752                                 "Invalid %s channel filter strength: %u\n",
 753                                 fwnode_get_name(ch_node), val);
 754                         return -EINVAL;
 755                 }
 756
 757                 *hyst &= ~IQS626_FILT_STR_NP_TPx_MASK;
 758                 *hyst |= (val << IQS626_FILT_STR_NP_TPx_SHIFT);
 759         }
 760
 761         if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-lp-cnt",
 762                                       &val)) {
 763                 if (val > IQS626_FILT_STR_MAX) {
 764                         dev_err(&client->dev,
 765                                 "Invalid %s channel filter strength: %u\n",
 766                                 fwnode_get_name(ch_node), val);
 767                         return -EINVAL;
 768                 }
 769
 770                 *hyst &= ~IQS626_FILT_STR_LP_TPx_MASK;
 771                 *hyst |= (val << IQS626_FILT_STR_LP_TPx_SHIFT);
 772         }
 773
 774         for (i = 0; i < iqs626_channels[ch_id].num_ch; i++) {
 775                 u8 *ati_base = &sys_reg->tp_grp_reg.ch_reg_tp[i].ati_base;
 776                 u8 *thresh = &sys_reg->tp_grp_reg.ch_reg_tp[i].thresh;
 777                 struct fwnode_handle *tc_node;
 778                 char tc_name[10];
 779
 780                 snprintf(tc_name, sizeof(tc_name), "channel-%d", i);
 781
 782                 tc_node = fwnode_get_named_child_node(ch_node, tc_name);
 783                 if (!tc_node)
 784                         continue;
 785
 786                 if (!fwnode_property_read_u32(tc_node, "azoteq,ati-base",
 787                                               &val)) {
 788                         if (val < IQS626_TPx_ATI_BASE_MIN ||
 789                             val > IQS626_TPx_ATI_BASE_MAX) {
 790                                 dev_err(&client->dev,
 791                                         "Invalid %s %s ATI base: %u\n",
 792                                         fwnode_get_name(ch_node), tc_name, val);
 793                                 fwnode_handle_put(tc_node);
 794                                 return -EINVAL;
 795                         }
 796
 797                         *ati_base = val - IQS626_TPx_ATI_BASE_MIN;
 798                 }
 799
 800                 if (!fwnode_property_read_u32(tc_node, "azoteq,thresh",
 801                                               &val)) {
 802                         if (val > IQS626_CHx_THRESH_MAX) {
 803                                 dev_err(&client->dev,
 804                                         "Invalid %s %s threshold: %u\n",
 805                                         fwnode_get_name(ch_node), tc_name, val);
 806                                 fwnode_handle_put(tc_node);
 807                                 return -EINVAL;
 808                         }
 809
 810                         *thresh = val;
 811                 }
 812
 813                 fwnode_handle_put(tc_node);
 814         }
 815
 816         if (!fwnode_property_present(ch_node, "linux,keycodes"))
 817                 return 0;
 818
 819         count = fwnode_property_count_u32(ch_node, "linux,keycodes");
 820         if (count > IQS626_NUM_GESTURES) {
 821                 dev_err(&client->dev, "Too many keycodes present\n");
 822                 return -EINVAL;
 823         } else if (count < 0) {
 824                 dev_err(&client->dev, "Failed to count keycodes: %d\n", count);
 825                 return count;
 826         }
 827
 828         error = fwnode_property_read_u32_array(ch_node, "linux,keycodes",
 829                                                iqs626->tp_code, count);
 830         if (error) {
 831                 dev_err(&client->dev, "Failed to read keycodes: %d\n", error);
 832                 return error;
 833         }
 834
 835         sys_reg->misc_b &= ~IQS626_MISC_B_TPx_SWIPE;
 836         if (fwnode_property_present(ch_node, "azoteq,gesture-swipe"))
 837                 sys_reg->misc_b |= IQS626_MISC_B_TPx_SWIPE;
 838
 839         if (!fwnode_property_read_u32(ch_node, "azoteq,timeout-tap-ms",
 840                                       &val)) {
 841                 if (val > IQS626_TIMEOUT_TAP_MS_MAX) {
 842                         dev_err(&client->dev,
 843                                 "Invalid %s channel timeout: %u\n",
 844                                 fwnode_get_name(ch_node), val);
 845                         return -EINVAL;
 846                 }
 847
 848                 sys_reg->timeout_tap = val / 16;
 849         }
 850
 851         if (!fwnode_property_read_u32(ch_node, "azoteq,timeout-swipe-ms",
 852                                       &val)) {
 853                 if (val > IQS626_TIMEOUT_SWIPE_MS_MAX) {
 854                         dev_err(&client->dev,
 855                                 "Invalid %s channel timeout: %u\n",
 856                                 fwnode_get_name(ch_node), val);
 857                         return -EINVAL;
 858                 }
 859
 860                 sys_reg->timeout_swipe = val / 16;
 861         }
 862
 863         if (!fwnode_property_read_u32(ch_node, "azoteq,thresh-swipe",
 864                                       &val)) {
 865                 if (val > IQS626_THRESH_SWIPE_MAX) {
 866                         dev_err(&client->dev,
 867                                 "Invalid %s channel threshold: %u\n",
 868                                 fwnode_get_name(ch_node), val);
 869                         return -EINVAL;
 870                 }
 871
 872                 sys_reg->thresh_swipe = val;
 873         }
 874
 875         sys_reg->event_mask &= ~IQS626_EVENT_MASK_GESTURE;
 876
 877         return 0;
 878 }
 879
 880 static noinline_for_stack int
 881 iqs626_parse_channel(struct iqs626_private *iqs626,
 882                      struct fwnode_handle *ch_node, enum iqs626_ch_id ch_id)
 883 {
 884         struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
 885         struct i2c_client *client = iqs626->client;
 886         u8 *engine, *filter, *rx_enable, *tx_enable;
 887         u8 *assoc_select, *assoc_weight;
 888         unsigned int val;
 889         int error, i;
 890
 891         switch (ch_id) {
 892         case IQS626_CH_ULP_0:
 893                 engine = sys_reg->ch_reg_ulp.engine;
 894                 break;
 895
 896         case IQS626_CH_TP_2:
 897         case IQS626_CH_TP_3:
 898                 engine = sys_reg->tp_grp_reg.engine;
 899                 break;
 900
 901         case IQS626_CH_GEN_0:
 902         case IQS626_CH_GEN_1:
 903         case IQS626_CH_GEN_2:
 904                 i = ch_id - IQS626_CH_GEN_0;
 905                 engine = sys_reg->ch_reg_gen[i].engine;
 906                 break;
 907
 908         case IQS626_CH_HALL:
 909                 engine = &sys_reg->ch_reg_hall.engine;
 910                 break;
 911
 912         default:
 913                 return -EINVAL;
 914         }
 915
 916         error = iqs626_parse_ati_target(iqs626, ch_node, ch_id);
 917         if (error)
 918                 return error;
 919
 920         error = iqs626_parse_events(iqs626, ch_node, ch_id);
 921         if (error)
 922                 return error;
 923
 924         if (!fwnode_property_present(ch_node, "azoteq,ati-exclude"))
 925                 sys_reg->redo_ati |= iqs626_channels[ch_id].active;
 926
 927         if (!fwnode_property_present(ch_node, "azoteq,reseed-disable"))
 928                 sys_reg->reseed |= iqs626_channels[ch_id].active;
 929
 930         *engine |= IQS626_CHx_ENG_0_MEAS_CAP_SIZE;
 931         if (fwnode_property_present(ch_node, "azoteq,meas-cap-decrease"))
 932                 *engine &= ~IQS626_CHx_ENG_0_MEAS_CAP_SIZE;
 933
 934         *engine |= IQS626_CHx_ENG_0_RX_TERM_VSS;
 935         if (!fwnode_property_read_u32(ch_node, "azoteq,rx-inactive", &val)) {
 936                 switch (val) {
 937                 case IQS626_RX_INACTIVE_VSS:
 938                         break;
 939
 940                 case IQS626_RX_INACTIVE_FLOAT:
 941                         *engine &= ~IQS626_CHx_ENG_0_RX_TERM_VSS;
 942                         if (ch_id == IQS626_CH_GEN_0 ||
 943                             ch_id == IQS626_CH_GEN_1 ||
 944                             ch_id == IQS626_CH_GEN_2)
 945                                 *(engine + 4) &= ~IQS626_CHx_ENG_4_RX_TERM_VREG;
 946                         break;
 947
 948                 case IQS626_RX_INACTIVE_VREG:
 949                         if (ch_id == IQS626_CH_GEN_0 ||
 950                             ch_id == IQS626_CH_GEN_1 ||
 951                             ch_id == IQS626_CH_GEN_2) {
 952                                 *engine &= ~IQS626_CHx_ENG_0_RX_TERM_VSS;
 953                                 *(engine + 4) |= IQS626_CHx_ENG_4_RX_TERM_VREG;
 954                                 break;
 955                         }
 956                         fallthrough;
 957
 958                 default:
 959                         dev_err(&client->dev,
 960                                 "Invalid %s channel CRX pin termination: %u\n",
 961                                 fwnode_get_name(ch_node), val);
 962                         return -EINVAL;
 963                 }
 964         }
 965
 966         *engine &= ~IQS626_CHx_ENG_0_LINEARIZE;
 967         if (fwnode_property_present(ch_node, "azoteq,linearize"))
 968                 *engine |= IQS626_CHx_ENG_0_LINEARIZE;
 969
 970         *engine &= ~IQS626_CHx_ENG_0_DUAL_DIR;
 971         if (fwnode_property_present(ch_node, "azoteq,dual-direction"))
 972                 *engine |= IQS626_CHx_ENG_0_DUAL_DIR;
 973
 974         *engine &= ~IQS626_CHx_ENG_0_FILT_DISABLE;
 975         if (fwnode_property_present(ch_node, "azoteq,filt-disable"))
 976                 *engine |= IQS626_CHx_ENG_0_FILT_DISABLE;
 977
 978         if (!fwnode_property_read_u32(ch_node, "azoteq,ati-mode", &val)) {
 979                 if (val > IQS626_CHx_ENG_0_ATI_MODE_MAX) {
 980                         dev_err(&client->dev,
 981                                 "Invalid %s channel ATI mode: %u\n",
 982                                 fwnode_get_name(ch_node), val);
 983                         return -EINVAL;
 984                 }
 985
 986                 *engine &= ~IQS626_CHx_ENG_0_ATI_MODE_MASK;
 987                 *engine |= val;
 988         }
 989
 990         if (ch_id == IQS626_CH_HALL)
 991                 return 0;
 992
 993         *(engine + 1) &= ~IQS626_CHx_ENG_1_CCT_ENABLE;
 994         if (!fwnode_property_read_u32(ch_node, "azoteq,cct-increase",
 995                                       &val) && val) {
 996                 unsigned int orig_val = val--;
 997
 998                 /*
 999                  * In the case of the generic channels, the charge cycle time
1000                  * field doubles in size and straddles two separate registers.
1001                  */
1002                 if (ch_id == IQS626_CH_GEN_0 ||
1003                     ch_id == IQS626_CH_GEN_1 ||
1004                     ch_id == IQS626_CH_GEN_2) {
1005                         *(engine + 4) &= ~IQS626_CHx_ENG_4_CCT_LOW_1;
1006                         if (val & BIT(1))
1007                                 *(engine + 4) |= IQS626_CHx_ENG_4_CCT_LOW_1;
1008
1009                         *(engine + 4) &= ~IQS626_CHx_ENG_4_CCT_LOW_0;
1010                         if (val & BIT(0))
1011                                 *(engine + 4) |= IQS626_CHx_ENG_4_CCT_LOW_0;
1012
1013                         val >>= 2;
1014                 }
1015
1016                 if (val & ~GENMASK(1, 0)) {
1017                         dev_err(&client->dev,
1018                                 "Invalid %s channel charge cycle time: %u\n",
1019                                 fwnode_get_name(ch_node), orig_val);
1020                         return -EINVAL;
1021                 }
1022
1023                 *(engine + 1) &= ~IQS626_CHx_ENG_1_CCT_HIGH_1;
1024                 if (val & BIT(1))
1025                         *(engine + 1) |= IQS626_CHx_ENG_1_CCT_HIGH_1;
1026
1027                 *(engine + 1) &= ~IQS626_CHx_ENG_1_CCT_HIGH_0;
1028                 if (val & BIT(0))
1029                         *(engine + 1) |= IQS626_CHx_ENG_1_CCT_HIGH_0;
1030
1031                 *(engine + 1) |= IQS626_CHx_ENG_1_CCT_ENABLE;
1032         }
1033
1034         if (!fwnode_property_read_u32(ch_node, "azoteq,proj-bias", &val)) {
1035                 if (val > IQS626_CHx_ENG_1_PROJ_BIAS_MAX) {
1036                         dev_err(&client->dev,
1037                                 "Invalid %s channel bias current: %u\n",
1038                                 fwnode_get_name(ch_node), val);
1039                         return -EINVAL;
1040                 }
1041
1042                 *(engine + 1) &= ~IQS626_CHx_ENG_1_PROJ_BIAS_MASK;
1043                 *(engine + 1) |= (val << IQS626_CHx_ENG_1_PROJ_BIAS_SHIFT);
1044         }
1045
1046         if (!fwnode_property_read_u32(ch_node, "azoteq,sense-freq", &val)) {
1047                 if (val > IQS626_CHx_ENG_1_SENSE_FREQ_MAX) {
1048                         dev_err(&client->dev,
1049                                 "Invalid %s channel sensing frequency: %u\n",
1050                                 fwnode_get_name(ch_node), val);
1051                         return -EINVAL;
1052                 }
1053
1054                 *(engine + 1) &= ~IQS626_CHx_ENG_1_SENSE_FREQ_MASK;
1055                 *(engine + 1) |= (val << IQS626_CHx_ENG_1_SENSE_FREQ_SHIFT);
1056         }
1057
1058         *(engine + 1) &= ~IQS626_CHx_ENG_1_ATI_BAND_TIGHTEN;
1059         if (fwnode_property_present(ch_node, "azoteq,ati-band-tighten"))
1060                 *(engine + 1) |= IQS626_CHx_ENG_1_ATI_BAND_TIGHTEN;
1061
1062         if (ch_id == IQS626_CH_TP_2 || ch_id == IQS626_CH_TP_3)
1063                 return iqs626_parse_trackpad(iqs626, ch_node, ch_id);
1064
1065         if (ch_id == IQS626_CH_ULP_0) {
1066                 sys_reg->ch_reg_ulp.hyst &= ~IQS626_ULP_PROJ_ENABLE;
1067                 if (fwnode_property_present(ch_node, "azoteq,proj-enable"))
1068                         sys_reg->ch_reg_ulp.hyst |= IQS626_ULP_PROJ_ENABLE;
1069
1070                 filter = &sys_reg->ch_reg_ulp.filter;
1071
1072                 rx_enable = &sys_reg->ch_reg_ulp.rx_enable;
1073                 tx_enable = &sys_reg->ch_reg_ulp.tx_enable;
1074         } else {
1075                 i = ch_id - IQS626_CH_GEN_0;
1076                 filter = &sys_reg->ch_reg_gen[i].filter;
1077
1078                 rx_enable = &sys_reg->ch_reg_gen[i].rx_enable;
1079                 tx_enable = &sys_reg->ch_reg_gen[i].tx_enable;
1080         }
1081
1082         if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-np-cnt",
1083                                       &val)) {
1084                 if (val > IQS626_FILT_STR_MAX) {
1085                         dev_err(&client->dev,
1086                                 "Invalid %s channel filter strength: %u\n",
1087                                 fwnode_get_name(ch_node), val);
1088                         return -EINVAL;
1089                 }
1090
1091                 *filter &= ~IQS626_FILT_STR_NP_CNT_MASK;
1092                 *filter |= (val << IQS626_FILT_STR_NP_CNT_SHIFT);
1093         }
1094
1095         if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-lp-cnt",
1096                                       &val)) {
1097                 if (val > IQS626_FILT_STR_MAX) {
1098                         dev_err(&client->dev,
1099                                 "Invalid %s channel filter strength: %u\n",
1100                                 fwnode_get_name(ch_node), val);
1101                         return -EINVAL;
1102                 }
1103
1104                 *filter &= ~IQS626_FILT_STR_LP_CNT_MASK;
1105                 *filter |= (val << IQS626_FILT_STR_LP_CNT_SHIFT);
1106         }
1107
1108         if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-np-lta",
1109                                       &val)) {
1110                 if (val > IQS626_FILT_STR_MAX) {
1111                         dev_err(&client->dev,
1112                                 "Invalid %s channel filter strength: %u\n",
1113                                 fwnode_get_name(ch_node), val);
1114                         return -EINVAL;
1115                 }
1116
1117                 *filter &= ~IQS626_FILT_STR_NP_LTA_MASK;
1118                 *filter |= (val << IQS626_FILT_STR_NP_LTA_SHIFT);
1119         }
1120
1121         if (!fwnode_property_read_u32(ch_node, "azoteq,filt-str-lp-lta",
1122                                       &val)) {
1123                 if (val > IQS626_FILT_STR_MAX) {
1124                         dev_err(&client->dev,
1125                                 "Invalid %s channel filter strength: %u\n",
1126                                 fwnode_get_name(ch_node), val);
1127                         return -EINVAL;
1128                 }
1129
1130                 *filter &= ~IQS626_FILT_STR_LP_LTA_MASK;
1131                 *filter |= val;
1132         }
1133
1134         error = iqs626_parse_pins(iqs626, ch_node, "azoteq,rx-enable",
1135                                   rx_enable);
1136         if (error)
1137                 return error;
1138
1139         error = iqs626_parse_pins(iqs626, ch_node, "azoteq,tx-enable",
1140                                   tx_enable);
1141         if (error)
1142                 return error;
1143
1144         if (ch_id == IQS626_CH_ULP_0)
1145                 return 0;
1146
1147         *(engine + 2) &= ~IQS626_CHx_ENG_2_LOCAL_CAP_ENABLE;
1148         if (!fwnode_property_read_u32(ch_node, "azoteq,local-cap-size",
1149                                       &val) && val) {
1150                 unsigned int orig_val = val--;
1151
1152                 if (val > IQS626_CHx_ENG_2_LOCAL_CAP_MAX) {
1153                         dev_err(&client->dev,
1154                                 "Invalid %s channel local cap. size: %u\n",
1155                                 fwnode_get_name(ch_node), orig_val);
1156                         return -EINVAL;
1157                 }
1158
1159                 *(engine + 2) &= ~IQS626_CHx_ENG_2_LOCAL_CAP_MASK;
1160                 *(engine + 2) |= (val << IQS626_CHx_ENG_2_LOCAL_CAP_SHIFT);
1161
1162                 *(engine + 2) |= IQS626_CHx_ENG_2_LOCAL_CAP_ENABLE;
1163         }
1164
1165         if (!fwnode_property_read_u32(ch_node, "azoteq,sense-mode", &val)) {
1166                 if (val > IQS626_CHx_ENG_2_SENSE_MODE_MAX) {
1167                         dev_err(&client->dev,
1168                                 "Invalid %s channel sensing mode: %u\n",
1169                                 fwnode_get_name(ch_node), val);
1170                         return -EINVAL;
1171                 }
1172
1173                 *(engine + 2) &= ~IQS626_CHx_ENG_2_SENSE_MODE_MASK;
1174                 *(engine + 2) |= val;
1175         }
1176
1177         if (!fwnode_property_read_u32(ch_node, "azoteq,tx-freq", &val)) {
1178                 if (val > IQS626_CHx_ENG_3_TX_FREQ_MAX) {
1179                         dev_err(&client->dev,
1180                                 "Invalid %s channel excitation frequency: %u\n",
1181                                 fwnode_get_name(ch_node), val);
1182                         return -EINVAL;
1183                 }
1184
1185                 *(engine + 3) &= ~IQS626_CHx_ENG_3_TX_FREQ_MASK;
1186                 *(engine + 3) |= (val << IQS626_CHx_ENG_3_TX_FREQ_SHIFT);
1187         }
1188
1189         *(engine + 3) &= ~IQS626_CHx_ENG_3_INV_LOGIC;
1190         if (fwnode_property_present(ch_node, "azoteq,invert-enable"))
1191                 *(engine + 3) |= IQS626_CHx_ENG_3_INV_LOGIC;
1192
1193         *(engine + 4) &= ~IQS626_CHx_ENG_4_COMP_DISABLE;
1194         if (fwnode_property_present(ch_node, "azoteq,comp-disable"))
1195                 *(engine + 4) |= IQS626_CHx_ENG_4_COMP_DISABLE;
1196
1197         *(engine + 4) &= ~IQS626_CHx_ENG_4_STATIC_ENABLE;
1198         if (fwnode_property_present(ch_node, "azoteq,static-enable"))
1199                 *(engine + 4) |= IQS626_CHx_ENG_4_STATIC_ENABLE;
1200
1201         i = ch_id - IQS626_CH_GEN_0;
1202         assoc_select = &sys_reg->ch_reg_gen[i].assoc_select;
1203         assoc_weight = &sys_reg->ch_reg_gen[i].assoc_weight;
1204
1205         *assoc_select = 0;
1206         if (!fwnode_property_present(ch_node, "azoteq,assoc-select"))
1207                 return 0;
1208
1209         for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
1210                 if (fwnode_property_match_string(ch_node, "azoteq,assoc-select",
1211                                                  iqs626_channels[i].name) < 0)
1212                         continue;
1213
1214                 *assoc_select |= iqs626_channels[i].active;
1215         }
1216
1217         if (fwnode_property_read_u32(ch_node, "azoteq,assoc-weight", &val))
1218                 return 0;
1219
1220         if (val > IQS626_GEN_WEIGHT_MAX) {
1221                 dev_err(&client->dev,
1222                         "Invalid %s channel associated weight: %u\n",
1223                         fwnode_get_name(ch_node), val);
1224                 return -EINVAL;
1225         }
1226
1227         *assoc_weight = val;
1228
1229         return 0;
1230 }
1231
1232 static int iqs626_parse_prop(struct iqs626_private *iqs626)
1233 {
1234         struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
1235         struct i2c_client *client = iqs626->client;
1236         struct fwnode_handle *ch_node;
1237         unsigned int val;
1238         int error, i;
1239         u16 general;
1240
1241         if (!device_property_read_u32(&client->dev, "azoteq,suspend-mode",
1242                                       &val)) {
1243                 if (val > IQS626_SYS_SETTINGS_PWR_MODE_MAX) {
1244                         dev_err(&client->dev, "Invalid suspend mode: %u\n",
1245                                 val);
1246                         return -EINVAL;
1247                 }
1248
1249                 iqs626->suspend_mode = val;
1250         }
1251
1252         error = regmap_raw_read(iqs626->regmap, IQS626_SYS_SETTINGS, sys_reg,
1253                                 sizeof(*sys_reg));
1254         if (error)
1255                 return error;
1256
1257         general = be16_to_cpu(sys_reg->general);
1258         general &= IQS626_SYS_SETTINGS_ULP_UPDATE_MASK;
1259
1260         if (device_property_present(&client->dev, "azoteq,clk-div"))
1261                 general |= IQS626_SYS_SETTINGS_CLK_DIV;
1262
1263         if (device_property_present(&client->dev, "azoteq,ulp-enable"))
1264                 general |= IQS626_SYS_SETTINGS_ULP_AUTO;
1265
1266         if (!device_property_read_u32(&client->dev, "azoteq,ulp-update",
1267                                       &val)) {
1268                 if (val > IQS626_SYS_SETTINGS_ULP_UPDATE_MAX) {
1269                         dev_err(&client->dev, "Invalid update rate: %u\n", val);
1270                         return -EINVAL;
1271                 }
1272
1273                 general &= ~IQS626_SYS_SETTINGS_ULP_UPDATE_MASK;
1274                 general |= (val << IQS626_SYS_SETTINGS_ULP_UPDATE_SHIFT);
1275         }
1276
1277         sys_reg->misc_a &= ~IQS626_MISC_A_ATI_BAND_DISABLE;
1278         if (device_property_present(&client->dev, "azoteq,ati-band-disable"))
1279                 sys_reg->misc_a |= IQS626_MISC_A_ATI_BAND_DISABLE;
1280
1281         sys_reg->misc_a &= ~IQS626_MISC_A_ATI_LP_ONLY;
1282         if (device_property_present(&client->dev, "azoteq,ati-lp-only"))
1283                 sys_reg->misc_a |= IQS626_MISC_A_ATI_LP_ONLY;
1284
1285         if (!device_property_read_u32(&client->dev, "azoteq,gpio3-select",
1286                                       &val)) {
1287                 if (val > IQS626_MISC_A_GPIO3_SELECT_MAX) {
1288                         dev_err(&client->dev, "Invalid GPIO3 selection: %u\n",
1289                                 val);
1290                         return -EINVAL;
1291                 }
1292
1293                 sys_reg->misc_a &= ~IQS626_MISC_A_GPIO3_SELECT_MASK;
1294                 sys_reg->misc_a |= val;
1295         }
1296
1297         if (!device_property_read_u32(&client->dev, "azoteq,reseed-select",
1298                                       &val)) {
1299                 if (val > IQS626_MISC_B_RESEED_UI_SEL_MAX) {
1300                         dev_err(&client->dev, "Invalid reseed selection: %u\n",
1301                                 val);
1302                         return -EINVAL;
1303                 }
1304
1305                 sys_reg->misc_b &= ~IQS626_MISC_B_RESEED_UI_SEL_MASK;
1306                 sys_reg->misc_b |= (val << IQS626_MISC_B_RESEED_UI_SEL_SHIFT);
1307         }
1308
1309         sys_reg->misc_b &= ~IQS626_MISC_B_THRESH_EXTEND;
1310         if (device_property_present(&client->dev, "azoteq,thresh-extend"))
1311                 sys_reg->misc_b |= IQS626_MISC_B_THRESH_EXTEND;
1312
1313         sys_reg->misc_b &= ~IQS626_MISC_B_TRACKING_UI_ENABLE;
1314         if (device_property_present(&client->dev, "azoteq,tracking-enable"))
1315                 sys_reg->misc_b |= IQS626_MISC_B_TRACKING_UI_ENABLE;
1316
1317         sys_reg->misc_b &= ~IQS626_MISC_B_RESEED_OFFSET;
1318         if (device_property_present(&client->dev, "azoteq,reseed-offset"))
1319                 sys_reg->misc_b |= IQS626_MISC_B_RESEED_OFFSET;
1320
1321         if (!device_property_read_u32(&client->dev, "azoteq,rate-np-ms",
1322                                       &val)) {
1323                 if (val > IQS626_RATE_NP_MS_MAX) {
1324                         dev_err(&client->dev, "Invalid report rate: %u\n", val);
1325                         return -EINVAL;
1326                 }
1327
1328                 sys_reg->rate_np = val;
1329         }
1330
1331         if (!device_property_read_u32(&client->dev, "azoteq,rate-lp-ms",
1332                                       &val)) {
1333                 if (val > IQS626_RATE_LP_MS_MAX) {
1334                         dev_err(&client->dev, "Invalid report rate: %u\n", val);
1335                         return -EINVAL;
1336                 }
1337
1338                 sys_reg->rate_lp = val;
1339         }
1340
1341         if (!device_property_read_u32(&client->dev, "azoteq,rate-ulp-ms",
1342                                       &val)) {
1343                 if (val > IQS626_RATE_ULP_MS_MAX) {
1344                         dev_err(&client->dev, "Invalid report rate: %u\n", val);
1345                         return -EINVAL;
1346                 }
1347
1348                 sys_reg->rate_ulp = val / 16;
1349         }
1350
1351         if (!device_property_read_u32(&client->dev, "azoteq,timeout-pwr-ms",
1352                                       &val)) {
1353                 if (val > IQS626_TIMEOUT_PWR_MS_MAX) {
1354                         dev_err(&client->dev, "Invalid timeout: %u\n", val);
1355                         return -EINVAL;
1356                 }
1357
1358                 sys_reg->timeout_pwr = val / 512;
1359         }
1360
1361         if (!device_property_read_u32(&client->dev, "azoteq,timeout-lta-ms",
1362                                       &val)) {
1363                 if (val > IQS626_TIMEOUT_LTA_MS_MAX) {
1364                         dev_err(&client->dev, "Invalid timeout: %u\n", val);
1365                         return -EINVAL;
1366                 }
1367
1368                 sys_reg->timeout_lta = val / 512;
1369         }
1370
1371         sys_reg->event_mask = ~((u8)IQS626_EVENT_MASK_SYS);
1372         sys_reg->redo_ati = 0;
1373
1374         sys_reg->reseed = 0;
1375         sys_reg->active = 0;
1376
1377         for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
1378                 ch_node = device_get_named_child_node(&client->dev,
1379                                                       iqs626_channels[i].name);
1380                 if (!ch_node)
1381                         continue;
1382
1383                 error = iqs626_parse_channel(iqs626, ch_node, i);
1384                 fwnode_handle_put(ch_node);
1385                 if (error)
1386                         return error;
1387
1388                 sys_reg->active |= iqs626_channels[i].active;
1389         }
1390
1391         general |= IQS626_SYS_SETTINGS_EVENT_MODE;
1392
1393         /*
1394          * Enable streaming during normal-power mode if the trackpad is used to
1395          * report raw coordinates instead of gestures. In that case, the device
1396          * returns to event mode during low-power mode.
1397          */
1398         if (sys_reg->active & iqs626_channels[IQS626_CH_TP_2].active &&
1399             sys_reg->event_mask & IQS626_EVENT_MASK_GESTURE)
1400                 general |= IQS626_SYS_SETTINGS_EVENT_MODE_LP;
1401
1402         general |= IQS626_SYS_SETTINGS_REDO_ATI;
1403         general |= IQS626_SYS_SETTINGS_ACK_RESET;
1404
1405         sys_reg->general = cpu_to_be16(general);
1406
1407         error = regmap_raw_write(iqs626->regmap, IQS626_SYS_SETTINGS,
1408                                  &iqs626->sys_reg, sizeof(iqs626->sys_reg));
1409         if (error)
1410                 return error;
1411
1412         iqs626_irq_wait();
1413
1414         return 0;
1415 }
1416
1417 static int iqs626_input_init(struct iqs626_private *iqs626)
1418 {
1419         struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
1420         struct i2c_client *client = iqs626->client;
1421         int error, i, j;
1422
1423         iqs626->keypad = devm_input_allocate_device(&client->dev);
1424         if (!iqs626->keypad)
1425                 return -ENOMEM;
1426
1427         iqs626->keypad->keycodemax = ARRAY_SIZE(iqs626->kp_code);
1428         iqs626->keypad->keycode = iqs626->kp_code;
1429         iqs626->keypad->keycodesize = sizeof(**iqs626->kp_code);
1430
1431         iqs626->keypad->name = "iqs626a_keypad";
1432         iqs626->keypad->id.bustype = BUS_I2C;
1433
1434         for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
1435                 if (!(sys_reg->active & iqs626_channels[i].active))
1436                         continue;
1437
1438                 for (j = 0; j < ARRAY_SIZE(iqs626_events); j++) {
1439                         if (!iqs626->kp_type[i][j])
1440                                 continue;
1441
1442                         input_set_capability(iqs626->keypad,
1443                                              iqs626->kp_type[i][j],
1444                                              iqs626->kp_code[i][j]);
1445                 }
1446         }
1447
1448         if (!(sys_reg->active & iqs626_channels[IQS626_CH_TP_2].active))
1449                 return 0;
1450
1451         iqs626->trackpad = devm_input_allocate_device(&client->dev);
1452         if (!iqs626->trackpad)
1453                 return -ENOMEM;
1454
1455         iqs626->trackpad->keycodemax = ARRAY_SIZE(iqs626->tp_code);
1456         iqs626->trackpad->keycode = iqs626->tp_code;
1457         iqs626->trackpad->keycodesize = sizeof(*iqs626->tp_code);
1458
1459         iqs626->trackpad->name = "iqs626a_trackpad";
1460         iqs626->trackpad->id.bustype = BUS_I2C;
1461
1462         /*
1463          * Present the trackpad as a traditional pointing device if no gestures
1464          * have been mapped to a keycode.
1465          */
1466         if (sys_reg->event_mask & IQS626_EVENT_MASK_GESTURE) {
1467                 u8 tp_mask = iqs626_channels[IQS626_CH_TP_3].active;
1468
1469                 input_set_capability(iqs626->trackpad, EV_KEY, BTN_TOUCH);
1470                 input_set_abs_params(iqs626->trackpad, ABS_Y, 0, 255, 0, 0);
1471
1472                 if ((sys_reg->active & tp_mask) == tp_mask)
1473                         input_set_abs_params(iqs626->trackpad,
1474                                              ABS_X, 0, 255, 0, 0);
1475                 else
1476                         input_set_abs_params(iqs626->trackpad,
1477                                              ABS_X, 0, 128, 0, 0);
1478
1479                 touchscreen_parse_properties(iqs626->trackpad, false,
1480                                              &iqs626->prop);
1481         } else {
1482                 for (i = 0; i < IQS626_NUM_GESTURES; i++)
1483                         if (iqs626->tp_code[i] != KEY_RESERVED)
1484                                 input_set_capability(iqs626->trackpad, EV_KEY,
1485                                                      iqs626->tp_code[i]);
1486         }
1487
1488         error = input_register_device(iqs626->trackpad);
1489         if (error)
1490                 dev_err(&client->dev, "Failed to register trackpad: %d\n",
1491                         error);
1492
1493         return error;
1494 }
1495
1496 static int iqs626_report(struct iqs626_private *iqs626)
1497 {
1498         struct iqs626_sys_reg *sys_reg = &iqs626->sys_reg;
1499         struct i2c_client *client = iqs626->client;
1500         struct iqs626_flags flags;
1501         __le16 hall_output;
1502         int error, i, j;
1503         u8 state;
1504         u8 *dir_mask = &flags.states[IQS626_ST_OFFS_DIR];
1505
1506         error = regmap_raw_read(iqs626->regmap, IQS626_SYS_FLAGS, &flags,
1507                                 sizeof(flags));
1508         if (error) {
1509                 dev_err(&client->dev, "Failed to read device status: %d\n",
1510                         error);
1511                 return error;
1512         }
1513
1514         /*
1515          * The device resets itself if its own watchdog bites, which can happen
1516          * in the event of an I2C communication error. In this case, the device
1517          * asserts a SHOW_RESET interrupt and all registers must be restored.
1518          */
1519         if (be16_to_cpu(flags.system) & IQS626_SYS_FLAGS_SHOW_RESET) {
1520                 dev_err(&client->dev, "Unexpected device reset\n");
1521
1522                 error = regmap_raw_write(iqs626->regmap, IQS626_SYS_SETTINGS,
1523                                          sys_reg, sizeof(*sys_reg));
1524                 if (error)
1525                         dev_err(&client->dev,
1526                                 "Failed to re-initialize device: %d\n", error);
1527
1528                 return error;
1529         }
1530
1531         if (be16_to_cpu(flags.system) & IQS626_SYS_FLAGS_IN_ATI)
1532                 return 0;
1533
1534         /*
1535          * Unlike the ULP or generic channels, the Hall channel does not have a
1536          * direction flag. Instead, the direction (i.e. magnet polarity) can be
1537          * derived based on the sign of the 2's complement differential output.
1538          */
1539         if (sys_reg->active & iqs626_channels[IQS626_CH_HALL].active) {
1540                 error = regmap_raw_read(iqs626->regmap, IQS626_HALL_OUTPUT,
1541                                         &hall_output, sizeof(hall_output));
1542                 if (error) {
1543                         dev_err(&client->dev,
1544                                 "Failed to read Hall output: %d\n", error);
1545                         return error;
1546                 }
1547
1548                 *dir_mask &= ~iqs626_channels[IQS626_CH_HALL].active;
1549                 if (le16_to_cpu(hall_output) < 0x8000)
1550                         *dir_mask |= iqs626_channels[IQS626_CH_HALL].active;
1551         }
1552
1553         for (i = 0; i < ARRAY_SIZE(iqs626_channels); i++) {
1554                 if (!(sys_reg->active & iqs626_channels[i].active))
1555                         continue;
1556
1557                 for (j = 0; j < ARRAY_SIZE(iqs626_events); j++) {
1558                         if (!iqs626->kp_type[i][j])
1559                                 continue;
1560
1561                         state = flags.states[iqs626_events[j].st_offs];
1562                         state &= iqs626_events[j].dir_up ? *dir_mask
1563                                                          : ~(*dir_mask);
1564                         state &= iqs626_channels[i].active;
1565
1566                         input_event(iqs626->keypad, iqs626->kp_type[i][j],
1567                                     iqs626->kp_code[i][j], !!state);
1568                 }
1569         }
1570
1571         input_sync(iqs626->keypad);
1572
1573         /*
1574          * The following completion signals that ATI has finished, any initial
1575          * switch states have been reported and the keypad can be registered.
1576          */
1577         complete_all(&iqs626->ati_done);
1578
1579         if (!(sys_reg->active & iqs626_channels[IQS626_CH_TP_2].active))
1580                 return 0;
1581
1582         if (sys_reg->event_mask & IQS626_EVENT_MASK_GESTURE) {
1583                 state = flags.states[IQS626_ST_OFFS_TOUCH];
1584                 state &= iqs626_channels[IQS626_CH_TP_2].active;
1585
1586                 input_report_key(iqs626->trackpad, BTN_TOUCH, state);
1587
1588                 if (state)
1589                         touchscreen_report_pos(iqs626->trackpad, &iqs626->prop,
1590                                                flags.trackpad_x,
1591                                                flags.trackpad_y, false);
1592         } else {
1593                 for (i = 0; i < IQS626_NUM_GESTURES; i++)
1594                         input_report_key(iqs626->trackpad, iqs626->tp_code[i],
1595                                          flags.gesture & BIT(i));
1596
1597                 if (flags.gesture & GENMASK(IQS626_GESTURE_TAP, 0)) {
1598                         input_sync(iqs626->trackpad);
1599
1600                         /*
1601                          * Momentary gestures are followed by a complementary
1602                          * release cycle so as to emulate a full keystroke.
1603                          */
1604                         for (i = 0; i < IQS626_GESTURE_HOLD; i++)
1605                                 input_report_key(iqs626->trackpad,
1606                                                  iqs626->tp_code[i], 0);
1607                 }
1608         }
1609
1610         input_sync(iqs626->trackpad);
1611
1612         return 0;
1613 }
1614
1615 static irqreturn_t iqs626_irq(int irq, void *context)
1616 {
1617         struct iqs626_private *iqs626 = context;
1618
1619         if (iqs626_report(iqs626))
1620                 return IRQ_NONE;
1621
1622         /*
1623          * The device does not deassert its interrupt (RDY) pin until shortly
1624          * after receiving an I2C stop condition; the following delay ensures
1625          * the interrupt handler does not return before this time.
1626          */
1627         iqs626_irq_wait();
1628
1629         return IRQ_HANDLED;
1630 }
1631
1632 static const struct regmap_config iqs626_regmap_config = {
1633         .reg_bits = 8,
1634         .val_bits = 16,
1635         .max_register = IQS626_MAX_REG,
1636 };
1637
1638 static int iqs626_probe(struct i2c_client *client)
1639 {
1640         struct iqs626_ver_info ver_info;
1641         struct iqs626_private *iqs626;
1642         int error;
1643
1644         iqs626 = devm_kzalloc(&client->dev, sizeof(*iqs626), GFP_KERNEL);
1645         if (!iqs626)
1646                 return -ENOMEM;
1647
1648         i2c_set_clientdata(client, iqs626);
1649         iqs626->client = client;
1650
1651         iqs626->regmap = devm_regmap_init_i2c(client, &iqs626_regmap_config);
1652         if (IS_ERR(iqs626->regmap)) {
1653                 error = PTR_ERR(iqs626->regmap);
1654                 dev_err(&client->dev, "Failed to initialize register map: %d\n",
1655                         error);
1656                 return error;
1657         }
1658
1659         init_completion(&iqs626->ati_done);
1660
1661         error = regmap_raw_read(iqs626->regmap, IQS626_VER_INFO, &ver_info,
1662                                 sizeof(ver_info));
1663         if (error)
1664                 return error;
1665
1666         if (ver_info.prod_num != IQS626_VER_INFO_PROD_NUM) {
1667                 dev_err(&client->dev, "Unrecognized product number: 0x%02X\n",
1668                         ver_info.prod_num);
1669                 return -EINVAL;
1670         }
1671
1672         error = iqs626_parse_prop(iqs626);
1673         if (error)
1674                 return error;
1675
1676         error = iqs626_input_init(iqs626);
1677         if (error)
1678                 return error;
1679
1680         error = devm_request_threaded_irq(&client->dev, client->irq,
1681                                           NULL, iqs626_irq, IRQF_ONESHOT,
1682                                           client->name, iqs626);
1683         if (error) {
1684                 dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
1685                 return error;
1686         }
1687
1688         if (!wait_for_completion_timeout(&iqs626->ati_done,
1689                                          msecs_to_jiffies(2000))) {
1690                 dev_err(&client->dev, "Failed to complete ATI\n");
1691                 return -ETIMEDOUT;
1692         }
1693
1694         /*
1695          * The keypad may include one or more switches and is not registered
1696          * until ATI is complete and the initial switch states are read.
1697          */
1698         error = input_register_device(iqs626->keypad);
1699         if (error)
1700                 dev_err(&client->dev, "Failed to register keypad: %d\n", error);
1701
1702         return error;
1703 }
1704
1705 static int iqs626_suspend(struct device *dev)
1706 {
1707         struct iqs626_private *iqs626 = dev_get_drvdata(dev);
1708         struct i2c_client *client = iqs626->client;
1709         unsigned int val;
1710         int error;
1711
1712         if (!iqs626->suspend_mode)
1713                 return 0;
1714
1715         disable_irq(client->irq);
1716
1717         /*
1718          * Automatic power mode switching must be disabled before the device is
1719          * forced into any particular power mode. In this case, the device will
1720          * transition into normal-power mode.
1721          */
1722         error = regmap_update_bits(iqs626->regmap, IQS626_SYS_SETTINGS,
1723                                    IQS626_SYS_SETTINGS_DIS_AUTO, ~0);
1724         if (error)
1725                 goto err_irq;
1726
1727         /*
1728          * The following check ensures the device has completed its transition
1729          * into normal-power mode before a manual mode switch is performed.
1730          */
1731         error = regmap_read_poll_timeout(iqs626->regmap, IQS626_SYS_FLAGS, val,
1732                                         !(val & IQS626_SYS_FLAGS_PWR_MODE_MASK),
1733                                          IQS626_PWR_MODE_POLL_SLEEP_US,
1734                                          IQS626_PWR_MODE_POLL_TIMEOUT_US);
1735         if (error)
1736                 goto err_irq;
1737
1738         error = regmap_update_bits(iqs626->regmap, IQS626_SYS_SETTINGS,
1739                                    IQS626_SYS_SETTINGS_PWR_MODE_MASK,
1740                                    iqs626->suspend_mode <<
1741                                    IQS626_SYS_SETTINGS_PWR_MODE_SHIFT);
1742         if (error)
1743                 goto err_irq;
1744
1745         /*
1746          * This last check ensures the device has completed its transition into
1747          * the desired power mode to prevent any spurious interrupts from being
1748          * triggered after iqs626_suspend has already returned.
1749          */
1750         error = regmap_read_poll_timeout(iqs626->regmap, IQS626_SYS_FLAGS, val,
1751                                          (val & IQS626_SYS_FLAGS_PWR_MODE_MASK)
1752                                          == (iqs626->suspend_mode <<
1753                                              IQS626_SYS_FLAGS_PWR_MODE_SHIFT),
1754                                          IQS626_PWR_MODE_POLL_SLEEP_US,
1755                                          IQS626_PWR_MODE_POLL_TIMEOUT_US);
1756
1757 err_irq:
1758         iqs626_irq_wait();
1759         enable_irq(client->irq);
1760
1761         return error;
1762 }
1763
1764 static int iqs626_resume(struct device *dev)
1765 {
1766         struct iqs626_private *iqs626 = dev_get_drvdata(dev);
1767         struct i2c_client *client = iqs626->client;
1768         unsigned int val;
1769         int error;
1770
1771         if (!iqs626->suspend_mode)
1772                 return 0;
1773
1774         disable_irq(client->irq);
1775
1776         error = regmap_update_bits(iqs626->regmap, IQS626_SYS_SETTINGS,
1777                                    IQS626_SYS_SETTINGS_PWR_MODE_MASK, 0);
1778         if (error)
1779                 goto err_irq;
1780
1781         /*
1782          * This check ensures the device has returned to normal-power mode
1783          * before automatic power mode switching is re-enabled.
1784          */
1785         error = regmap_read_poll_timeout(iqs626->regmap, IQS626_SYS_FLAGS, val,
1786                                         !(val & IQS626_SYS_FLAGS_PWR_MODE_MASK),
1787                                          IQS626_PWR_MODE_POLL_SLEEP_US,
1788                                          IQS626_PWR_MODE_POLL_TIMEOUT_US);
1789         if (error)
1790                 goto err_irq;
1791
1792         error = regmap_update_bits(iqs626->regmap, IQS626_SYS_SETTINGS,
1793                                    IQS626_SYS_SETTINGS_DIS_AUTO, 0);
1794         if (error)
1795                 goto err_irq;
1796
1797         /*
1798          * This step reports any events that may have been "swallowed" as a
1799          * result of polling PWR_MODE (which automatically acknowledges any
1800          * pending interrupts).
1801          */
1802         error = iqs626_report(iqs626);
1803
1804 err_irq:
1805         iqs626_irq_wait();
1806         enable_irq(client->irq);
1807
1808         return error;
1809 }
1810
1811 static DEFINE_SIMPLE_DEV_PM_OPS(iqs626_pm, iqs626_suspend, iqs626_resume);
1812
1813 static const struct of_device_id iqs626_of_match[] = {
1814         { .compatible = "azoteq,iqs626a" },
1815         { }
1816 };
1817 MODULE_DEVICE_TABLE(of, iqs626_of_match);
1818
1819 static struct i2c_driver iqs626_i2c_driver = {
1820         .driver = {
1821                 .name = "iqs626a",
1822                 .of_match_table = iqs626_of_match,
1823                 .pm = pm_sleep_ptr(&iqs626_pm),
1824         },
1825         .probe = iqs626_probe,
1826 };
1827 module_i2c_driver(iqs626_i2c_driver);
1828
1829 MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
1830 MODULE_DESCRIPTION("Azoteq IQS626A Capacitive Touch Controller");
1831 MODULE_LICENSE("GPL");