linux/drivers/input/misc/iqs269a.c
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   1// SPDX-License-Identifier: GPL-2.0+
   2/*
   3 * Azoteq IQS269A Capacitive Touch Controller
   4 *
   5 * Copyright (C) 2020 Jeff LaBundy <jeff@labundy.com>
   6 *
   7 * This driver registers up to 3 input devices: one representing capacitive or
   8 * inductive keys as well as Hall-effect switches, and one for each of the two
   9 * axial sliders presented by the device.
  10 */
  11
  12#include <linux/delay.h>
  13#include <linux/device.h>
  14#include <linux/err.h>
  15#include <linux/i2c.h>
  16#include <linux/input.h>
  17#include <linux/interrupt.h>
  18#include <linux/kernel.h>
  19#include <linux/module.h>
  20#include <linux/mutex.h>
  21#include <linux/of_device.h>
  22#include <linux/property.h>
  23#include <linux/regmap.h>
  24#include <linux/slab.h>
  25
  26#define IQS269_VER_INFO                         0x00
  27#define IQS269_VER_INFO_PROD_NUM                0x4F
  28
  29#define IQS269_SYS_FLAGS                        0x02
  30#define IQS269_SYS_FLAGS_SHOW_RESET             BIT(15)
  31#define IQS269_SYS_FLAGS_PWR_MODE_MASK          GENMASK(12, 11)
  32#define IQS269_SYS_FLAGS_PWR_MODE_SHIFT         11
  33#define IQS269_SYS_FLAGS_IN_ATI                 BIT(10)
  34
  35#define IQS269_CHx_COUNTS                       0x08
  36
  37#define IQS269_SLIDER_X                         0x30
  38
  39#define IQS269_CAL_DATA_A                       0x35
  40#define IQS269_CAL_DATA_A_HALL_BIN_L_MASK       GENMASK(15, 12)
  41#define IQS269_CAL_DATA_A_HALL_BIN_L_SHIFT      12
  42#define IQS269_CAL_DATA_A_HALL_BIN_R_MASK       GENMASK(11, 8)
  43#define IQS269_CAL_DATA_A_HALL_BIN_R_SHIFT      8
  44
  45#define IQS269_SYS_SETTINGS                     0x80
  46#define IQS269_SYS_SETTINGS_CLK_DIV             BIT(15)
  47#define IQS269_SYS_SETTINGS_ULP_AUTO            BIT(14)
  48#define IQS269_SYS_SETTINGS_DIS_AUTO            BIT(13)
  49#define IQS269_SYS_SETTINGS_PWR_MODE_MASK       GENMASK(12, 11)
  50#define IQS269_SYS_SETTINGS_PWR_MODE_SHIFT      11
  51#define IQS269_SYS_SETTINGS_PWR_MODE_MAX        3
  52#define IQS269_SYS_SETTINGS_ULP_UPDATE_MASK     GENMASK(10, 8)
  53#define IQS269_SYS_SETTINGS_ULP_UPDATE_SHIFT    8
  54#define IQS269_SYS_SETTINGS_ULP_UPDATE_MAX      7
  55#define IQS269_SYS_SETTINGS_RESEED_OFFSET       BIT(6)
  56#define IQS269_SYS_SETTINGS_EVENT_MODE          BIT(5)
  57#define IQS269_SYS_SETTINGS_EVENT_MODE_LP       BIT(4)
  58#define IQS269_SYS_SETTINGS_REDO_ATI            BIT(2)
  59#define IQS269_SYS_SETTINGS_ACK_RESET           BIT(0)
  60
  61#define IQS269_FILT_STR_LP_LTA_MASK             GENMASK(7, 6)
  62#define IQS269_FILT_STR_LP_LTA_SHIFT            6
  63#define IQS269_FILT_STR_LP_CNT_MASK             GENMASK(5, 4)
  64#define IQS269_FILT_STR_LP_CNT_SHIFT            4
  65#define IQS269_FILT_STR_NP_LTA_MASK             GENMASK(3, 2)
  66#define IQS269_FILT_STR_NP_LTA_SHIFT            2
  67#define IQS269_FILT_STR_NP_CNT_MASK             GENMASK(1, 0)
  68#define IQS269_FILT_STR_MAX                     3
  69
  70#define IQS269_EVENT_MASK_SYS                   BIT(6)
  71#define IQS269_EVENT_MASK_DEEP                  BIT(2)
  72#define IQS269_EVENT_MASK_TOUCH                 BIT(1)
  73#define IQS269_EVENT_MASK_PROX                  BIT(0)
  74
  75#define IQS269_RATE_NP_MS_MAX                   255
  76#define IQS269_RATE_LP_MS_MAX                   255
  77#define IQS269_RATE_ULP_MS_MAX                  4080
  78#define IQS269_TIMEOUT_PWR_MS_MAX               130560
  79#define IQS269_TIMEOUT_LTA_MS_MAX               130560
  80
  81#define IQS269_MISC_A_ATI_BAND_DISABLE          BIT(15)
  82#define IQS269_MISC_A_ATI_LP_ONLY               BIT(14)
  83#define IQS269_MISC_A_ATI_BAND_TIGHTEN          BIT(13)
  84#define IQS269_MISC_A_FILT_DISABLE              BIT(12)
  85#define IQS269_MISC_A_GPIO3_SELECT_MASK         GENMASK(10, 8)
  86#define IQS269_MISC_A_GPIO3_SELECT_SHIFT        8
  87#define IQS269_MISC_A_DUAL_DIR                  BIT(6)
  88#define IQS269_MISC_A_TX_FREQ_MASK              GENMASK(5, 4)
  89#define IQS269_MISC_A_TX_FREQ_SHIFT             4
  90#define IQS269_MISC_A_TX_FREQ_MAX               3
  91#define IQS269_MISC_A_GLOBAL_CAP_SIZE           BIT(0)
  92
  93#define IQS269_MISC_B_RESEED_UI_SEL_MASK        GENMASK(7, 6)
  94#define IQS269_MISC_B_RESEED_UI_SEL_SHIFT       6
  95#define IQS269_MISC_B_RESEED_UI_SEL_MAX         3
  96#define IQS269_MISC_B_TRACKING_UI_ENABLE        BIT(4)
  97#define IQS269_MISC_B_FILT_STR_SLIDER           GENMASK(1, 0)
  98
  99#define IQS269_CHx_SETTINGS                     0x8C
 100
 101#define IQS269_CHx_ENG_A_MEAS_CAP_SIZE          BIT(15)
 102#define IQS269_CHx_ENG_A_RX_GND_INACTIVE        BIT(13)
 103#define IQS269_CHx_ENG_A_LOCAL_CAP_SIZE         BIT(12)
 104#define IQS269_CHx_ENG_A_ATI_MODE_MASK          GENMASK(9, 8)
 105#define IQS269_CHx_ENG_A_ATI_MODE_SHIFT         8
 106#define IQS269_CHx_ENG_A_ATI_MODE_MAX           3
 107#define IQS269_CHx_ENG_A_INV_LOGIC              BIT(7)
 108#define IQS269_CHx_ENG_A_PROJ_BIAS_MASK         GENMASK(6, 5)
 109#define IQS269_CHx_ENG_A_PROJ_BIAS_SHIFT        5
 110#define IQS269_CHx_ENG_A_PROJ_BIAS_MAX          3
 111#define IQS269_CHx_ENG_A_SENSE_MODE_MASK        GENMASK(3, 0)
 112#define IQS269_CHx_ENG_A_SENSE_MODE_MAX         15
 113
 114#define IQS269_CHx_ENG_B_LOCAL_CAP_ENABLE       BIT(13)
 115#define IQS269_CHx_ENG_B_SENSE_FREQ_MASK        GENMASK(10, 9)
 116#define IQS269_CHx_ENG_B_SENSE_FREQ_SHIFT       9
 117#define IQS269_CHx_ENG_B_SENSE_FREQ_MAX         3
 118#define IQS269_CHx_ENG_B_STATIC_ENABLE          BIT(8)
 119#define IQS269_CHx_ENG_B_ATI_BASE_MASK          GENMASK(7, 6)
 120#define IQS269_CHx_ENG_B_ATI_BASE_75            0x00
 121#define IQS269_CHx_ENG_B_ATI_BASE_100           0x40
 122#define IQS269_CHx_ENG_B_ATI_BASE_150           0x80
 123#define IQS269_CHx_ENG_B_ATI_BASE_200           0xC0
 124#define IQS269_CHx_ENG_B_ATI_TARGET_MASK        GENMASK(5, 0)
 125#define IQS269_CHx_ENG_B_ATI_TARGET_MAX         2016
 126
 127#define IQS269_CHx_WEIGHT_MAX                   255
 128#define IQS269_CHx_THRESH_MAX                   255
 129#define IQS269_CHx_HYST_DEEP_MASK               GENMASK(7, 4)
 130#define IQS269_CHx_HYST_DEEP_SHIFT              4
 131#define IQS269_CHx_HYST_TOUCH_MASK              GENMASK(3, 0)
 132#define IQS269_CHx_HYST_MAX                     15
 133
 134#define IQS269_CHx_HALL_INACTIVE                6
 135#define IQS269_CHx_HALL_ACTIVE                  7
 136
 137#define IQS269_HALL_PAD_R                       BIT(0)
 138#define IQS269_HALL_PAD_L                       BIT(1)
 139#define IQS269_HALL_PAD_INV                     BIT(6)
 140
 141#define IQS269_HALL_UI                          0xF5
 142#define IQS269_HALL_UI_ENABLE                   BIT(15)
 143
 144#define IQS269_MAX_REG                          0xFF
 145
 146#define IQS269_NUM_CH                           8
 147#define IQS269_NUM_SL                           2
 148
 149#define IQS269_ATI_POLL_SLEEP_US                (iqs269->delay_mult * 10000)
 150#define IQS269_ATI_POLL_TIMEOUT_US              (iqs269->delay_mult * 500000)
 151#define IQS269_ATI_STABLE_DELAY_MS              (iqs269->delay_mult * 150)
 152
 153#define IQS269_PWR_MODE_POLL_SLEEP_US           IQS269_ATI_POLL_SLEEP_US
 154#define IQS269_PWR_MODE_POLL_TIMEOUT_US         IQS269_ATI_POLL_TIMEOUT_US
 155
 156#define iqs269_irq_wait()                       usleep_range(100, 150)
 157
 158enum iqs269_local_cap_size {
 159        IQS269_LOCAL_CAP_SIZE_0,
 160        IQS269_LOCAL_CAP_SIZE_GLOBAL_ONLY,
 161        IQS269_LOCAL_CAP_SIZE_GLOBAL_0pF5,
 162};
 163
 164enum iqs269_st_offs {
 165        IQS269_ST_OFFS_PROX,
 166        IQS269_ST_OFFS_DIR,
 167        IQS269_ST_OFFS_TOUCH,
 168        IQS269_ST_OFFS_DEEP,
 169};
 170
 171enum iqs269_th_offs {
 172        IQS269_TH_OFFS_PROX,
 173        IQS269_TH_OFFS_TOUCH,
 174        IQS269_TH_OFFS_DEEP,
 175};
 176
 177enum iqs269_event_id {
 178        IQS269_EVENT_PROX_DN,
 179        IQS269_EVENT_PROX_UP,
 180        IQS269_EVENT_TOUCH_DN,
 181        IQS269_EVENT_TOUCH_UP,
 182        IQS269_EVENT_DEEP_DN,
 183        IQS269_EVENT_DEEP_UP,
 184};
 185
 186struct iqs269_switch_desc {
 187        unsigned int code;
 188        bool enabled;
 189};
 190
 191struct iqs269_event_desc {
 192        const char *name;
 193        enum iqs269_st_offs st_offs;
 194        enum iqs269_th_offs th_offs;
 195        bool dir_up;
 196        u8 mask;
 197};
 198
 199static const struct iqs269_event_desc iqs269_events[] = {
 200        [IQS269_EVENT_PROX_DN] = {
 201                .name = "event-prox",
 202                .st_offs = IQS269_ST_OFFS_PROX,
 203                .th_offs = IQS269_TH_OFFS_PROX,
 204                .mask = IQS269_EVENT_MASK_PROX,
 205        },
 206        [IQS269_EVENT_PROX_UP] = {
 207                .name = "event-prox-alt",
 208                .st_offs = IQS269_ST_OFFS_PROX,
 209                .th_offs = IQS269_TH_OFFS_PROX,
 210                .dir_up = true,
 211                .mask = IQS269_EVENT_MASK_PROX,
 212        },
 213        [IQS269_EVENT_TOUCH_DN] = {
 214                .name = "event-touch",
 215                .st_offs = IQS269_ST_OFFS_TOUCH,
 216                .th_offs = IQS269_TH_OFFS_TOUCH,
 217                .mask = IQS269_EVENT_MASK_TOUCH,
 218        },
 219        [IQS269_EVENT_TOUCH_UP] = {
 220                .name = "event-touch-alt",
 221                .st_offs = IQS269_ST_OFFS_TOUCH,
 222                .th_offs = IQS269_TH_OFFS_TOUCH,
 223                .dir_up = true,
 224                .mask = IQS269_EVENT_MASK_TOUCH,
 225        },
 226        [IQS269_EVENT_DEEP_DN] = {
 227                .name = "event-deep",
 228                .st_offs = IQS269_ST_OFFS_DEEP,
 229                .th_offs = IQS269_TH_OFFS_DEEP,
 230                .mask = IQS269_EVENT_MASK_DEEP,
 231        },
 232        [IQS269_EVENT_DEEP_UP] = {
 233                .name = "event-deep-alt",
 234                .st_offs = IQS269_ST_OFFS_DEEP,
 235                .th_offs = IQS269_TH_OFFS_DEEP,
 236                .dir_up = true,
 237                .mask = IQS269_EVENT_MASK_DEEP,
 238        },
 239};
 240
 241struct iqs269_ver_info {
 242        u8 prod_num;
 243        u8 sw_num;
 244        u8 hw_num;
 245        u8 padding;
 246} __packed;
 247
 248struct iqs269_sys_reg {
 249        __be16 general;
 250        u8 active;
 251        u8 filter;
 252        u8 reseed;
 253        u8 event_mask;
 254        u8 rate_np;
 255        u8 rate_lp;
 256        u8 rate_ulp;
 257        u8 timeout_pwr;
 258        u8 timeout_rdy;
 259        u8 timeout_lta;
 260        __be16 misc_a;
 261        __be16 misc_b;
 262        u8 blocking;
 263        u8 padding;
 264        u8 slider_select[IQS269_NUM_SL];
 265        u8 timeout_tap;
 266        u8 timeout_swipe;
 267        u8 thresh_swipe;
 268        u8 redo_ati;
 269} __packed;
 270
 271struct iqs269_ch_reg {
 272        u8 rx_enable;
 273        u8 tx_enable;
 274        __be16 engine_a;
 275        __be16 engine_b;
 276        __be16 ati_comp;
 277        u8 thresh[3];
 278        u8 hyst;
 279        u8 assoc_select;
 280        u8 assoc_weight;
 281} __packed;
 282
 283struct iqs269_flags {
 284        __be16 system;
 285        u8 gesture;
 286        u8 padding;
 287        u8 states[4];
 288} __packed;
 289
 290struct iqs269_private {
 291        struct i2c_client *client;
 292        struct regmap *regmap;
 293        struct mutex lock;
 294        struct iqs269_switch_desc switches[ARRAY_SIZE(iqs269_events)];
 295        struct iqs269_ch_reg ch_reg[IQS269_NUM_CH];
 296        struct iqs269_sys_reg sys_reg;
 297        struct input_dev *keypad;
 298        struct input_dev *slider[IQS269_NUM_SL];
 299        unsigned int keycode[ARRAY_SIZE(iqs269_events) * IQS269_NUM_CH];
 300        unsigned int suspend_mode;
 301        unsigned int delay_mult;
 302        unsigned int ch_num;
 303        bool hall_enable;
 304        bool ati_current;
 305};
 306
 307static int iqs269_ati_mode_set(struct iqs269_private *iqs269,
 308                               unsigned int ch_num, unsigned int mode)
 309{
 310        u16 engine_a;
 311
 312        if (ch_num >= IQS269_NUM_CH)
 313                return -EINVAL;
 314
 315        if (mode > IQS269_CHx_ENG_A_ATI_MODE_MAX)
 316                return -EINVAL;
 317
 318        mutex_lock(&iqs269->lock);
 319
 320        engine_a = be16_to_cpu(iqs269->ch_reg[ch_num].engine_a);
 321
 322        engine_a &= ~IQS269_CHx_ENG_A_ATI_MODE_MASK;
 323        engine_a |= (mode << IQS269_CHx_ENG_A_ATI_MODE_SHIFT);
 324
 325        iqs269->ch_reg[ch_num].engine_a = cpu_to_be16(engine_a);
 326        iqs269->ati_current = false;
 327
 328        mutex_unlock(&iqs269->lock);
 329
 330        return 0;
 331}
 332
 333static int iqs269_ati_mode_get(struct iqs269_private *iqs269,
 334                               unsigned int ch_num, unsigned int *mode)
 335{
 336        u16 engine_a;
 337
 338        if (ch_num >= IQS269_NUM_CH)
 339                return -EINVAL;
 340
 341        mutex_lock(&iqs269->lock);
 342        engine_a = be16_to_cpu(iqs269->ch_reg[ch_num].engine_a);
 343        mutex_unlock(&iqs269->lock);
 344
 345        engine_a &= IQS269_CHx_ENG_A_ATI_MODE_MASK;
 346        *mode = (engine_a >> IQS269_CHx_ENG_A_ATI_MODE_SHIFT);
 347
 348        return 0;
 349}
 350
 351static int iqs269_ati_base_set(struct iqs269_private *iqs269,
 352                               unsigned int ch_num, unsigned int base)
 353{
 354        u16 engine_b;
 355
 356        if (ch_num >= IQS269_NUM_CH)
 357                return -EINVAL;
 358
 359        switch (base) {
 360        case 75:
 361                base = IQS269_CHx_ENG_B_ATI_BASE_75;
 362                break;
 363
 364        case 100:
 365                base = IQS269_CHx_ENG_B_ATI_BASE_100;
 366                break;
 367
 368        case 150:
 369                base = IQS269_CHx_ENG_B_ATI_BASE_150;
 370                break;
 371
 372        case 200:
 373                base = IQS269_CHx_ENG_B_ATI_BASE_200;
 374                break;
 375
 376        default:
 377                return -EINVAL;
 378        }
 379
 380        mutex_lock(&iqs269->lock);
 381
 382        engine_b = be16_to_cpu(iqs269->ch_reg[ch_num].engine_b);
 383
 384        engine_b &= ~IQS269_CHx_ENG_B_ATI_BASE_MASK;
 385        engine_b |= base;
 386
 387        iqs269->ch_reg[ch_num].engine_b = cpu_to_be16(engine_b);
 388        iqs269->ati_current = false;
 389
 390        mutex_unlock(&iqs269->lock);
 391
 392        return 0;
 393}
 394
 395static int iqs269_ati_base_get(struct iqs269_private *iqs269,
 396                               unsigned int ch_num, unsigned int *base)
 397{
 398        u16 engine_b;
 399
 400        if (ch_num >= IQS269_NUM_CH)
 401                return -EINVAL;
 402
 403        mutex_lock(&iqs269->lock);
 404        engine_b = be16_to_cpu(iqs269->ch_reg[ch_num].engine_b);
 405        mutex_unlock(&iqs269->lock);
 406
 407        switch (engine_b & IQS269_CHx_ENG_B_ATI_BASE_MASK) {
 408        case IQS269_CHx_ENG_B_ATI_BASE_75:
 409                *base = 75;
 410                return 0;
 411
 412        case IQS269_CHx_ENG_B_ATI_BASE_100:
 413                *base = 100;
 414                return 0;
 415
 416        case IQS269_CHx_ENG_B_ATI_BASE_150:
 417                *base = 150;
 418                return 0;
 419
 420        case IQS269_CHx_ENG_B_ATI_BASE_200:
 421                *base = 200;
 422                return 0;
 423
 424        default:
 425                return -EINVAL;
 426        }
 427}
 428
 429static int iqs269_ati_target_set(struct iqs269_private *iqs269,
 430                                 unsigned int ch_num, unsigned int target)
 431{
 432        u16 engine_b;
 433
 434        if (ch_num >= IQS269_NUM_CH)
 435                return -EINVAL;
 436
 437        if (target > IQS269_CHx_ENG_B_ATI_TARGET_MAX)
 438                return -EINVAL;
 439
 440        mutex_lock(&iqs269->lock);
 441
 442        engine_b = be16_to_cpu(iqs269->ch_reg[ch_num].engine_b);
 443
 444        engine_b &= ~IQS269_CHx_ENG_B_ATI_TARGET_MASK;
 445        engine_b |= target / 32;
 446
 447        iqs269->ch_reg[ch_num].engine_b = cpu_to_be16(engine_b);
 448        iqs269->ati_current = false;
 449
 450        mutex_unlock(&iqs269->lock);
 451
 452        return 0;
 453}
 454
 455static int iqs269_ati_target_get(struct iqs269_private *iqs269,
 456                                 unsigned int ch_num, unsigned int *target)
 457{
 458        u16 engine_b;
 459
 460        if (ch_num >= IQS269_NUM_CH)
 461                return -EINVAL;
 462
 463        mutex_lock(&iqs269->lock);
 464        engine_b = be16_to_cpu(iqs269->ch_reg[ch_num].engine_b);
 465        mutex_unlock(&iqs269->lock);
 466
 467        *target = (engine_b & IQS269_CHx_ENG_B_ATI_TARGET_MASK) * 32;
 468
 469        return 0;
 470}
 471
 472static int iqs269_parse_mask(const struct fwnode_handle *fwnode,
 473                             const char *propname, u8 *mask)
 474{
 475        unsigned int val[IQS269_NUM_CH];
 476        int count, error, i;
 477
 478        count = fwnode_property_count_u32(fwnode, propname);
 479        if (count < 0)
 480                return 0;
 481
 482        if (count > IQS269_NUM_CH)
 483                return -EINVAL;
 484
 485        error = fwnode_property_read_u32_array(fwnode, propname, val, count);
 486        if (error)
 487                return error;
 488
 489        *mask = 0;
 490
 491        for (i = 0; i < count; i++) {
 492                if (val[i] >= IQS269_NUM_CH)
 493                        return -EINVAL;
 494
 495                *mask |= BIT(val[i]);
 496        }
 497
 498        return 0;
 499}
 500
 501static int iqs269_parse_chan(struct iqs269_private *iqs269,
 502                             const struct fwnode_handle *ch_node)
 503{
 504        struct i2c_client *client = iqs269->client;
 505        struct fwnode_handle *ev_node;
 506        struct iqs269_ch_reg *ch_reg;
 507        u16 engine_a, engine_b;
 508        unsigned int reg, val;
 509        int error, i;
 510
 511        error = fwnode_property_read_u32(ch_node, "reg", &reg);
 512        if (error) {
 513                dev_err(&client->dev, "Failed to read channel number: %d\n",
 514                        error);
 515                return error;
 516        } else if (reg >= IQS269_NUM_CH) {
 517                dev_err(&client->dev, "Invalid channel number: %u\n", reg);
 518                return -EINVAL;
 519        }
 520
 521        iqs269->sys_reg.active |= BIT(reg);
 522        if (!fwnode_property_present(ch_node, "azoteq,reseed-disable"))
 523                iqs269->sys_reg.reseed |= BIT(reg);
 524
 525        if (fwnode_property_present(ch_node, "azoteq,blocking-enable"))
 526                iqs269->sys_reg.blocking |= BIT(reg);
 527
 528        if (fwnode_property_present(ch_node, "azoteq,slider0-select"))
 529                iqs269->sys_reg.slider_select[0] |= BIT(reg);
 530
 531        if (fwnode_property_present(ch_node, "azoteq,slider1-select"))
 532                iqs269->sys_reg.slider_select[1] |= BIT(reg);
 533
 534        ch_reg = &iqs269->ch_reg[reg];
 535
 536        error = regmap_raw_read(iqs269->regmap,
 537                                IQS269_CHx_SETTINGS + reg * sizeof(*ch_reg) / 2,
 538                                ch_reg, sizeof(*ch_reg));
 539        if (error)
 540                return error;
 541
 542        error = iqs269_parse_mask(ch_node, "azoteq,rx-enable",
 543                                  &ch_reg->rx_enable);
 544        if (error) {
 545                dev_err(&client->dev, "Invalid channel %u RX enable mask: %d\n",
 546                        reg, error);
 547                return error;
 548        }
 549
 550        error = iqs269_parse_mask(ch_node, "azoteq,tx-enable",
 551                                  &ch_reg->tx_enable);
 552        if (error) {
 553                dev_err(&client->dev, "Invalid channel %u TX enable mask: %d\n",
 554                        reg, error);
 555                return error;
 556        }
 557
 558        engine_a = be16_to_cpu(ch_reg->engine_a);
 559        engine_b = be16_to_cpu(ch_reg->engine_b);
 560
 561        engine_a |= IQS269_CHx_ENG_A_MEAS_CAP_SIZE;
 562        if (fwnode_property_present(ch_node, "azoteq,meas-cap-decrease"))
 563                engine_a &= ~IQS269_CHx_ENG_A_MEAS_CAP_SIZE;
 564
 565        engine_a |= IQS269_CHx_ENG_A_RX_GND_INACTIVE;
 566        if (fwnode_property_present(ch_node, "azoteq,rx-float-inactive"))
 567                engine_a &= ~IQS269_CHx_ENG_A_RX_GND_INACTIVE;
 568
 569        engine_a &= ~IQS269_CHx_ENG_A_LOCAL_CAP_SIZE;
 570        engine_b &= ~IQS269_CHx_ENG_B_LOCAL_CAP_ENABLE;
 571        if (!fwnode_property_read_u32(ch_node, "azoteq,local-cap-size", &val)) {
 572                switch (val) {
 573                case IQS269_LOCAL_CAP_SIZE_0:
 574                        break;
 575
 576                case IQS269_LOCAL_CAP_SIZE_GLOBAL_0pF5:
 577                        engine_a |= IQS269_CHx_ENG_A_LOCAL_CAP_SIZE;
 578                        fallthrough;
 579
 580                case IQS269_LOCAL_CAP_SIZE_GLOBAL_ONLY:
 581                        engine_b |= IQS269_CHx_ENG_B_LOCAL_CAP_ENABLE;
 582                        break;
 583
 584                default:
 585                        dev_err(&client->dev,
 586                                "Invalid channel %u local cap. size: %u\n", reg,
 587                                val);
 588                        return -EINVAL;
 589                }
 590        }
 591
 592        engine_a &= ~IQS269_CHx_ENG_A_INV_LOGIC;
 593        if (fwnode_property_present(ch_node, "azoteq,invert-enable"))
 594                engine_a |= IQS269_CHx_ENG_A_INV_LOGIC;
 595
 596        if (!fwnode_property_read_u32(ch_node, "azoteq,proj-bias", &val)) {
 597                if (val > IQS269_CHx_ENG_A_PROJ_BIAS_MAX) {
 598                        dev_err(&client->dev,
 599                                "Invalid channel %u bias current: %u\n", reg,
 600                                val);
 601                        return -EINVAL;
 602                }
 603
 604                engine_a &= ~IQS269_CHx_ENG_A_PROJ_BIAS_MASK;
 605                engine_a |= (val << IQS269_CHx_ENG_A_PROJ_BIAS_SHIFT);
 606        }
 607
 608        if (!fwnode_property_read_u32(ch_node, "azoteq,sense-mode", &val)) {
 609                if (val > IQS269_CHx_ENG_A_SENSE_MODE_MAX) {
 610                        dev_err(&client->dev,
 611                                "Invalid channel %u sensing mode: %u\n", reg,
 612                                val);
 613                        return -EINVAL;
 614                }
 615
 616                engine_a &= ~IQS269_CHx_ENG_A_SENSE_MODE_MASK;
 617                engine_a |= val;
 618        }
 619
 620        if (!fwnode_property_read_u32(ch_node, "azoteq,sense-freq", &val)) {
 621                if (val > IQS269_CHx_ENG_B_SENSE_FREQ_MAX) {
 622                        dev_err(&client->dev,
 623                                "Invalid channel %u sensing frequency: %u\n",
 624                                reg, val);
 625                        return -EINVAL;
 626                }
 627
 628                engine_b &= ~IQS269_CHx_ENG_B_SENSE_FREQ_MASK;
 629                engine_b |= (val << IQS269_CHx_ENG_B_SENSE_FREQ_SHIFT);
 630        }
 631
 632        engine_b &= ~IQS269_CHx_ENG_B_STATIC_ENABLE;
 633        if (fwnode_property_present(ch_node, "azoteq,static-enable"))
 634                engine_b |= IQS269_CHx_ENG_B_STATIC_ENABLE;
 635
 636        ch_reg->engine_a = cpu_to_be16(engine_a);
 637        ch_reg->engine_b = cpu_to_be16(engine_b);
 638
 639        if (!fwnode_property_read_u32(ch_node, "azoteq,ati-mode", &val)) {
 640                error = iqs269_ati_mode_set(iqs269, reg, val);
 641                if (error) {
 642                        dev_err(&client->dev,
 643                                "Invalid channel %u ATI mode: %u\n", reg, val);
 644                        return error;
 645                }
 646        }
 647
 648        if (!fwnode_property_read_u32(ch_node, "azoteq,ati-base", &val)) {
 649                error = iqs269_ati_base_set(iqs269, reg, val);
 650                if (error) {
 651                        dev_err(&client->dev,
 652                                "Invalid channel %u ATI base: %u\n", reg, val);
 653                        return error;
 654                }
 655        }
 656
 657        if (!fwnode_property_read_u32(ch_node, "azoteq,ati-target", &val)) {
 658                error = iqs269_ati_target_set(iqs269, reg, val);
 659                if (error) {
 660                        dev_err(&client->dev,
 661                                "Invalid channel %u ATI target: %u\n", reg,
 662                                val);
 663                        return error;
 664                }
 665        }
 666
 667        error = iqs269_parse_mask(ch_node, "azoteq,assoc-select",
 668                                  &ch_reg->assoc_select);
 669        if (error) {
 670                dev_err(&client->dev, "Invalid channel %u association: %d\n",
 671                        reg, error);
 672                return error;
 673        }
 674
 675        if (!fwnode_property_read_u32(ch_node, "azoteq,assoc-weight", &val)) {
 676                if (val > IQS269_CHx_WEIGHT_MAX) {
 677                        dev_err(&client->dev,
 678                                "Invalid channel %u associated weight: %u\n",
 679                                reg, val);
 680                        return -EINVAL;
 681                }
 682
 683                ch_reg->assoc_weight = val;
 684        }
 685
 686        for (i = 0; i < ARRAY_SIZE(iqs269_events); i++) {
 687                ev_node = fwnode_get_named_child_node(ch_node,
 688                                                      iqs269_events[i].name);
 689                if (!ev_node)
 690                        continue;
 691
 692                if (!fwnode_property_read_u32(ev_node, "azoteq,thresh", &val)) {
 693                        if (val > IQS269_CHx_THRESH_MAX) {
 694                                dev_err(&client->dev,
 695                                        "Invalid channel %u threshold: %u\n",
 696                                        reg, val);
 697                                return -EINVAL;
 698                        }
 699
 700                        ch_reg->thresh[iqs269_events[i].th_offs] = val;
 701                }
 702
 703                if (!fwnode_property_read_u32(ev_node, "azoteq,hyst", &val)) {
 704                        u8 *hyst = &ch_reg->hyst;
 705
 706                        if (val > IQS269_CHx_HYST_MAX) {
 707                                dev_err(&client->dev,
 708                                        "Invalid channel %u hysteresis: %u\n",
 709                                        reg, val);
 710                                return -EINVAL;
 711                        }
 712
 713                        if (i == IQS269_EVENT_DEEP_DN ||
 714                            i == IQS269_EVENT_DEEP_UP) {
 715                                *hyst &= ~IQS269_CHx_HYST_DEEP_MASK;
 716                                *hyst |= (val << IQS269_CHx_HYST_DEEP_SHIFT);
 717                        } else if (i == IQS269_EVENT_TOUCH_DN ||
 718                                   i == IQS269_EVENT_TOUCH_UP) {
 719                                *hyst &= ~IQS269_CHx_HYST_TOUCH_MASK;
 720                                *hyst |= val;
 721                        }
 722                }
 723
 724                if (fwnode_property_read_u32(ev_node, "linux,code", &val))
 725                        continue;
 726
 727                switch (reg) {
 728                case IQS269_CHx_HALL_ACTIVE:
 729                        if (iqs269->hall_enable) {
 730                                iqs269->switches[i].code = val;
 731                                iqs269->switches[i].enabled = true;
 732                        }
 733                        fallthrough;
 734
 735                case IQS269_CHx_HALL_INACTIVE:
 736                        if (iqs269->hall_enable)
 737                                break;
 738                        fallthrough;
 739
 740                default:
 741                        iqs269->keycode[i * IQS269_NUM_CH + reg] = val;
 742                }
 743
 744                iqs269->sys_reg.event_mask &= ~iqs269_events[i].mask;
 745        }
 746
 747        return 0;
 748}
 749
 750static int iqs269_parse_prop(struct iqs269_private *iqs269)
 751{
 752        struct iqs269_sys_reg *sys_reg = &iqs269->sys_reg;
 753        struct i2c_client *client = iqs269->client;
 754        struct fwnode_handle *ch_node;
 755        u16 general, misc_a, misc_b;
 756        unsigned int val;
 757        int error;
 758
 759        iqs269->hall_enable = device_property_present(&client->dev,
 760                                                      "azoteq,hall-enable");
 761
 762        if (!device_property_read_u32(&client->dev, "azoteq,suspend-mode",
 763                                      &val)) {
 764                if (val > IQS269_SYS_SETTINGS_PWR_MODE_MAX) {
 765                        dev_err(&client->dev, "Invalid suspend mode: %u\n",
 766                                val);
 767                        return -EINVAL;
 768                }
 769
 770                iqs269->suspend_mode = val;
 771        }
 772
 773        error = regmap_raw_read(iqs269->regmap, IQS269_SYS_SETTINGS, sys_reg,
 774                                sizeof(*sys_reg));
 775        if (error)
 776                return error;
 777
 778        if (!device_property_read_u32(&client->dev, "azoteq,filt-str-lp-lta",
 779                                      &val)) {
 780                if (val > IQS269_FILT_STR_MAX) {
 781                        dev_err(&client->dev, "Invalid filter strength: %u\n",
 782                                val);
 783                        return -EINVAL;
 784                }
 785
 786                sys_reg->filter &= ~IQS269_FILT_STR_LP_LTA_MASK;
 787                sys_reg->filter |= (val << IQS269_FILT_STR_LP_LTA_SHIFT);
 788        }
 789
 790        if (!device_property_read_u32(&client->dev, "azoteq,filt-str-lp-cnt",
 791                                      &val)) {
 792                if (val > IQS269_FILT_STR_MAX) {
 793                        dev_err(&client->dev, "Invalid filter strength: %u\n",
 794                                val);
 795                        return -EINVAL;
 796                }
 797
 798                sys_reg->filter &= ~IQS269_FILT_STR_LP_CNT_MASK;
 799                sys_reg->filter |= (val << IQS269_FILT_STR_LP_CNT_SHIFT);
 800        }
 801
 802        if (!device_property_read_u32(&client->dev, "azoteq,filt-str-np-lta",
 803                                      &val)) {
 804                if (val > IQS269_FILT_STR_MAX) {
 805                        dev_err(&client->dev, "Invalid filter strength: %u\n",
 806                                val);
 807                        return -EINVAL;
 808                }
 809
 810                sys_reg->filter &= ~IQS269_FILT_STR_NP_LTA_MASK;
 811                sys_reg->filter |= (val << IQS269_FILT_STR_NP_LTA_SHIFT);
 812        }
 813
 814        if (!device_property_read_u32(&client->dev, "azoteq,filt-str-np-cnt",
 815                                      &val)) {
 816                if (val > IQS269_FILT_STR_MAX) {
 817                        dev_err(&client->dev, "Invalid filter strength: %u\n",
 818                                val);
 819                        return -EINVAL;
 820                }
 821
 822                sys_reg->filter &= ~IQS269_FILT_STR_NP_CNT_MASK;
 823                sys_reg->filter |= val;
 824        }
 825
 826        if (!device_property_read_u32(&client->dev, "azoteq,rate-np-ms",
 827                                      &val)) {
 828                if (val > IQS269_RATE_NP_MS_MAX) {
 829                        dev_err(&client->dev, "Invalid report rate: %u\n", val);
 830                        return -EINVAL;
 831                }
 832
 833                sys_reg->rate_np = val;
 834        }
 835
 836        if (!device_property_read_u32(&client->dev, "azoteq,rate-lp-ms",
 837                                      &val)) {
 838                if (val > IQS269_RATE_LP_MS_MAX) {
 839                        dev_err(&client->dev, "Invalid report rate: %u\n", val);
 840                        return -EINVAL;
 841                }
 842
 843                sys_reg->rate_lp = val;
 844        }
 845
 846        if (!device_property_read_u32(&client->dev, "azoteq,rate-ulp-ms",
 847                                      &val)) {
 848                if (val > IQS269_RATE_ULP_MS_MAX) {
 849                        dev_err(&client->dev, "Invalid report rate: %u\n", val);
 850                        return -EINVAL;
 851                }
 852
 853                sys_reg->rate_ulp = val / 16;
 854        }
 855
 856        if (!device_property_read_u32(&client->dev, "azoteq,timeout-pwr-ms",
 857                                      &val)) {
 858                if (val > IQS269_TIMEOUT_PWR_MS_MAX) {
 859                        dev_err(&client->dev, "Invalid timeout: %u\n", val);
 860                        return -EINVAL;
 861                }
 862
 863                sys_reg->timeout_pwr = val / 512;
 864        }
 865
 866        if (!device_property_read_u32(&client->dev, "azoteq,timeout-lta-ms",
 867                                      &val)) {
 868                if (val > IQS269_TIMEOUT_LTA_MS_MAX) {
 869                        dev_err(&client->dev, "Invalid timeout: %u\n", val);
 870                        return -EINVAL;
 871                }
 872
 873                sys_reg->timeout_lta = val / 512;
 874        }
 875
 876        misc_a = be16_to_cpu(sys_reg->misc_a);
 877        misc_b = be16_to_cpu(sys_reg->misc_b);
 878
 879        misc_a &= ~IQS269_MISC_A_ATI_BAND_DISABLE;
 880        if (device_property_present(&client->dev, "azoteq,ati-band-disable"))
 881                misc_a |= IQS269_MISC_A_ATI_BAND_DISABLE;
 882
 883        misc_a &= ~IQS269_MISC_A_ATI_LP_ONLY;
 884        if (device_property_present(&client->dev, "azoteq,ati-lp-only"))
 885                misc_a |= IQS269_MISC_A_ATI_LP_ONLY;
 886
 887        misc_a &= ~IQS269_MISC_A_ATI_BAND_TIGHTEN;
 888        if (device_property_present(&client->dev, "azoteq,ati-band-tighten"))
 889                misc_a |= IQS269_MISC_A_ATI_BAND_TIGHTEN;
 890
 891        misc_a &= ~IQS269_MISC_A_FILT_DISABLE;
 892        if (device_property_present(&client->dev, "azoteq,filt-disable"))
 893                misc_a |= IQS269_MISC_A_FILT_DISABLE;
 894
 895        if (!device_property_read_u32(&client->dev, "azoteq,gpio3-select",
 896                                      &val)) {
 897                if (val >= IQS269_NUM_CH) {
 898                        dev_err(&client->dev, "Invalid GPIO3 selection: %u\n",
 899                                val);
 900                        return -EINVAL;
 901                }
 902
 903                misc_a &= ~IQS269_MISC_A_GPIO3_SELECT_MASK;
 904                misc_a |= (val << IQS269_MISC_A_GPIO3_SELECT_SHIFT);
 905        }
 906
 907        misc_a &= ~IQS269_MISC_A_DUAL_DIR;
 908        if (device_property_present(&client->dev, "azoteq,dual-direction"))
 909                misc_a |= IQS269_MISC_A_DUAL_DIR;
 910
 911        if (!device_property_read_u32(&client->dev, "azoteq,tx-freq", &val)) {
 912                if (val > IQS269_MISC_A_TX_FREQ_MAX) {
 913                        dev_err(&client->dev,
 914                                "Invalid excitation frequency: %u\n", val);
 915                        return -EINVAL;
 916                }
 917
 918                misc_a &= ~IQS269_MISC_A_TX_FREQ_MASK;
 919                misc_a |= (val << IQS269_MISC_A_TX_FREQ_SHIFT);
 920        }
 921
 922        misc_a &= ~IQS269_MISC_A_GLOBAL_CAP_SIZE;
 923        if (device_property_present(&client->dev, "azoteq,global-cap-increase"))
 924                misc_a |= IQS269_MISC_A_GLOBAL_CAP_SIZE;
 925
 926        if (!device_property_read_u32(&client->dev, "azoteq,reseed-select",
 927                                      &val)) {
 928                if (val > IQS269_MISC_B_RESEED_UI_SEL_MAX) {
 929                        dev_err(&client->dev, "Invalid reseed selection: %u\n",
 930                                val);
 931                        return -EINVAL;
 932                }
 933
 934                misc_b &= ~IQS269_MISC_B_RESEED_UI_SEL_MASK;
 935                misc_b |= (val << IQS269_MISC_B_RESEED_UI_SEL_SHIFT);
 936        }
 937
 938        misc_b &= ~IQS269_MISC_B_TRACKING_UI_ENABLE;
 939        if (device_property_present(&client->dev, "azoteq,tracking-enable"))
 940                misc_b |= IQS269_MISC_B_TRACKING_UI_ENABLE;
 941
 942        if (!device_property_read_u32(&client->dev, "azoteq,filt-str-slider",
 943                                      &val)) {
 944                if (val > IQS269_FILT_STR_MAX) {
 945                        dev_err(&client->dev, "Invalid filter strength: %u\n",
 946                                val);
 947                        return -EINVAL;
 948                }
 949
 950                misc_b &= ~IQS269_MISC_B_FILT_STR_SLIDER;
 951                misc_b |= val;
 952        }
 953
 954        sys_reg->misc_a = cpu_to_be16(misc_a);
 955        sys_reg->misc_b = cpu_to_be16(misc_b);
 956
 957        sys_reg->active = 0;
 958        sys_reg->reseed = 0;
 959
 960        sys_reg->blocking = 0;
 961
 962        sys_reg->slider_select[0] = 0;
 963        sys_reg->slider_select[1] = 0;
 964
 965        sys_reg->event_mask = ~((u8)IQS269_EVENT_MASK_SYS);
 966
 967        device_for_each_child_node(&client->dev, ch_node) {
 968                error = iqs269_parse_chan(iqs269, ch_node);
 969                if (error) {
 970                        fwnode_handle_put(ch_node);
 971                        return error;
 972                }
 973        }
 974
 975        /*
 976         * Volunteer all active channels to participate in ATI when REDO-ATI is
 977         * manually triggered.
 978         */
 979        sys_reg->redo_ati = sys_reg->active;
 980
 981        general = be16_to_cpu(sys_reg->general);
 982
 983        if (device_property_present(&client->dev, "azoteq,clk-div")) {
 984                general |= IQS269_SYS_SETTINGS_CLK_DIV;
 985                iqs269->delay_mult = 4;
 986        } else {
 987                general &= ~IQS269_SYS_SETTINGS_CLK_DIV;
 988                iqs269->delay_mult = 1;
 989        }
 990
 991        /*
 992         * Configure the device to automatically switch between normal and low-
 993         * power modes as a function of sensing activity. Ultra-low-power mode,
 994         * if enabled, is reserved for suspend.
 995         */
 996        general &= ~IQS269_SYS_SETTINGS_ULP_AUTO;
 997        general &= ~IQS269_SYS_SETTINGS_DIS_AUTO;
 998        general &= ~IQS269_SYS_SETTINGS_PWR_MODE_MASK;
 999
1000        if (!device_property_read_u32(&client->dev, "azoteq,ulp-update",
1001                                      &val)) {
1002                if (val > IQS269_SYS_SETTINGS_ULP_UPDATE_MAX) {
1003                        dev_err(&client->dev, "Invalid update rate: %u\n", val);
1004                        return -EINVAL;
1005                }
1006
1007                general &= ~IQS269_SYS_SETTINGS_ULP_UPDATE_MASK;
1008                general |= (val << IQS269_SYS_SETTINGS_ULP_UPDATE_SHIFT);
1009        }
1010
1011        general &= ~IQS269_SYS_SETTINGS_RESEED_OFFSET;
1012        if (device_property_present(&client->dev, "azoteq,reseed-offset"))
1013                general |= IQS269_SYS_SETTINGS_RESEED_OFFSET;
1014
1015        general |= IQS269_SYS_SETTINGS_EVENT_MODE;
1016
1017        /*
1018         * As per the datasheet, enable streaming during normal-power mode if
1019         * either slider is in use. In that case, the device returns to event
1020         * mode during low-power mode.
1021         */
1022        if (sys_reg->slider_select[0] || sys_reg->slider_select[1])
1023                general |= IQS269_SYS_SETTINGS_EVENT_MODE_LP;
1024
1025        general |= IQS269_SYS_SETTINGS_REDO_ATI;
1026        general |= IQS269_SYS_SETTINGS_ACK_RESET;
1027
1028        sys_reg->general = cpu_to_be16(general);
1029
1030        return 0;
1031}
1032
1033static int iqs269_dev_init(struct iqs269_private *iqs269)
1034{
1035        struct iqs269_sys_reg *sys_reg = &iqs269->sys_reg;
1036        struct iqs269_ch_reg *ch_reg;
1037        unsigned int val;
1038        int error, i;
1039
1040        mutex_lock(&iqs269->lock);
1041
1042        error = regmap_update_bits(iqs269->regmap, IQS269_HALL_UI,
1043                                   IQS269_HALL_UI_ENABLE,
1044                                   iqs269->hall_enable ? ~0 : 0);
1045        if (error)
1046                goto err_mutex;
1047
1048        for (i = 0; i < IQS269_NUM_CH; i++) {
1049                if (!(sys_reg->active & BIT(i)))
1050                        continue;
1051
1052                ch_reg = &iqs269->ch_reg[i];
1053
1054                error = regmap_raw_write(iqs269->regmap,
1055                                         IQS269_CHx_SETTINGS + i *
1056                                         sizeof(*ch_reg) / 2, ch_reg,
1057                                         sizeof(*ch_reg));
1058                if (error)
1059                        goto err_mutex;
1060        }
1061
1062        /*
1063         * The REDO-ATI and ATI channel selection fields must be written in the
1064         * same block write, so every field between registers 0x80 through 0x8B
1065         * (inclusive) must be written as well.
1066         */
1067        error = regmap_raw_write(iqs269->regmap, IQS269_SYS_SETTINGS, sys_reg,
1068                                 sizeof(*sys_reg));
1069        if (error)
1070                goto err_mutex;
1071
1072        error = regmap_read_poll_timeout(iqs269->regmap, IQS269_SYS_FLAGS, val,
1073                                        !(val & IQS269_SYS_FLAGS_IN_ATI),
1074                                         IQS269_ATI_POLL_SLEEP_US,
1075                                         IQS269_ATI_POLL_TIMEOUT_US);
1076        if (error)
1077                goto err_mutex;
1078
1079        msleep(IQS269_ATI_STABLE_DELAY_MS);
1080        iqs269->ati_current = true;
1081
1082err_mutex:
1083        mutex_unlock(&iqs269->lock);
1084
1085        return error;
1086}
1087
1088static int iqs269_input_init(struct iqs269_private *iqs269)
1089{
1090        struct i2c_client *client = iqs269->client;
1091        struct iqs269_flags flags;
1092        unsigned int sw_code, keycode;
1093        int error, i, j;
1094        u8 dir_mask, state;
1095
1096        iqs269->keypad = devm_input_allocate_device(&client->dev);
1097        if (!iqs269->keypad)
1098                return -ENOMEM;
1099
1100        iqs269->keypad->keycodemax = ARRAY_SIZE(iqs269->keycode);
1101        iqs269->keypad->keycode = iqs269->keycode;
1102        iqs269->keypad->keycodesize = sizeof(*iqs269->keycode);
1103
1104        iqs269->keypad->name = "iqs269a_keypad";
1105        iqs269->keypad->id.bustype = BUS_I2C;
1106
1107        if (iqs269->hall_enable) {
1108                error = regmap_raw_read(iqs269->regmap, IQS269_SYS_FLAGS,
1109                                        &flags, sizeof(flags));
1110                if (error) {
1111                        dev_err(&client->dev,
1112                                "Failed to read initial status: %d\n", error);
1113                        return error;
1114                }
1115        }
1116
1117        for (i = 0; i < ARRAY_SIZE(iqs269_events); i++) {
1118                dir_mask = flags.states[IQS269_ST_OFFS_DIR];
1119                if (!iqs269_events[i].dir_up)
1120                        dir_mask = ~dir_mask;
1121
1122                state = flags.states[iqs269_events[i].st_offs] & dir_mask;
1123
1124                sw_code = iqs269->switches[i].code;
1125
1126                for (j = 0; j < IQS269_NUM_CH; j++) {
1127                        keycode = iqs269->keycode[i * IQS269_NUM_CH + j];
1128
1129                        /*
1130                         * Hall-effect sensing repurposes a pair of dedicated
1131                         * channels, only one of which reports events.
1132                         */
1133                        switch (j) {
1134                        case IQS269_CHx_HALL_ACTIVE:
1135                                if (iqs269->hall_enable &&
1136                                    iqs269->switches[i].enabled) {
1137                                        input_set_capability(iqs269->keypad,
1138                                                             EV_SW, sw_code);
1139                                        input_report_switch(iqs269->keypad,
1140                                                            sw_code,
1141                                                            state & BIT(j));
1142                                }
1143                                fallthrough;
1144
1145                        case IQS269_CHx_HALL_INACTIVE:
1146                                if (iqs269->hall_enable)
1147                                        continue;
1148                                fallthrough;
1149
1150                        default:
1151                                if (keycode != KEY_RESERVED)
1152                                        input_set_capability(iqs269->keypad,
1153                                                             EV_KEY, keycode);
1154                        }
1155                }
1156        }
1157
1158        input_sync(iqs269->keypad);
1159
1160        error = input_register_device(iqs269->keypad);
1161        if (error) {
1162                dev_err(&client->dev, "Failed to register keypad: %d\n", error);
1163                return error;
1164        }
1165
1166        for (i = 0; i < IQS269_NUM_SL; i++) {
1167                if (!iqs269->sys_reg.slider_select[i])
1168                        continue;
1169
1170                iqs269->slider[i] = devm_input_allocate_device(&client->dev);
1171                if (!iqs269->slider[i])
1172                        return -ENOMEM;
1173
1174                iqs269->slider[i]->name = i ? "iqs269a_slider_1"
1175                                            : "iqs269a_slider_0";
1176                iqs269->slider[i]->id.bustype = BUS_I2C;
1177
1178                input_set_capability(iqs269->slider[i], EV_KEY, BTN_TOUCH);
1179                input_set_abs_params(iqs269->slider[i], ABS_X, 0, 255, 0, 0);
1180
1181                error = input_register_device(iqs269->slider[i]);
1182                if (error) {
1183                        dev_err(&client->dev,
1184                                "Failed to register slider %d: %d\n", i, error);
1185                        return error;
1186                }
1187        }
1188
1189        return 0;
1190}
1191
1192static int iqs269_report(struct iqs269_private *iqs269)
1193{
1194        struct i2c_client *client = iqs269->client;
1195        struct iqs269_flags flags;
1196        unsigned int sw_code, keycode;
1197        int error, i, j;
1198        u8 slider_x[IQS269_NUM_SL];
1199        u8 dir_mask, state;
1200
1201        error = regmap_raw_read(iqs269->regmap, IQS269_SYS_FLAGS, &flags,
1202                                sizeof(flags));
1203        if (error) {
1204                dev_err(&client->dev, "Failed to read device status: %d\n",
1205                        error);
1206                return error;
1207        }
1208
1209        /*
1210         * The device resets itself if its own watchdog bites, which can happen
1211         * in the event of an I2C communication error. In this case, the device
1212         * asserts a SHOW_RESET interrupt and all registers must be restored.
1213         */
1214        if (be16_to_cpu(flags.system) & IQS269_SYS_FLAGS_SHOW_RESET) {
1215                dev_err(&client->dev, "Unexpected device reset\n");
1216
1217                error = iqs269_dev_init(iqs269);
1218                if (error)
1219                        dev_err(&client->dev,
1220                                "Failed to re-initialize device: %d\n", error);
1221
1222                return error;
1223        }
1224
1225        error = regmap_raw_read(iqs269->regmap, IQS269_SLIDER_X, slider_x,
1226                                sizeof(slider_x));
1227        if (error) {
1228                dev_err(&client->dev, "Failed to read slider position: %d\n",
1229                        error);
1230                return error;
1231        }
1232
1233        for (i = 0; i < IQS269_NUM_SL; i++) {
1234                if (!iqs269->sys_reg.slider_select[i])
1235                        continue;
1236
1237                /*
1238                 * Report BTN_TOUCH if any channel that participates in the
1239                 * slider is in a state of touch.
1240                 */
1241                if (flags.states[IQS269_ST_OFFS_TOUCH] &
1242                    iqs269->sys_reg.slider_select[i]) {
1243                        input_report_key(iqs269->slider[i], BTN_TOUCH, 1);
1244                        input_report_abs(iqs269->slider[i], ABS_X, slider_x[i]);
1245                } else {
1246                        input_report_key(iqs269->slider[i], BTN_TOUCH, 0);
1247                }
1248
1249                input_sync(iqs269->slider[i]);
1250        }
1251
1252        for (i = 0; i < ARRAY_SIZE(iqs269_events); i++) {
1253                dir_mask = flags.states[IQS269_ST_OFFS_DIR];
1254                if (!iqs269_events[i].dir_up)
1255                        dir_mask = ~dir_mask;
1256
1257                state = flags.states[iqs269_events[i].st_offs] & dir_mask;
1258
1259                sw_code = iqs269->switches[i].code;
1260
1261                for (j = 0; j < IQS269_NUM_CH; j++) {
1262                        keycode = iqs269->keycode[i * IQS269_NUM_CH + j];
1263
1264                        switch (j) {
1265                        case IQS269_CHx_HALL_ACTIVE:
1266                                if (iqs269->hall_enable &&
1267                                    iqs269->switches[i].enabled)
1268                                        input_report_switch(iqs269->keypad,
1269                                                            sw_code,
1270                                                            state & BIT(j));
1271                                fallthrough;
1272
1273                        case IQS269_CHx_HALL_INACTIVE:
1274                                if (iqs269->hall_enable)
1275                                        continue;
1276                                fallthrough;
1277
1278                        default:
1279                                input_report_key(iqs269->keypad, keycode,
1280                                                 state & BIT(j));
1281                        }
1282                }
1283        }
1284
1285        input_sync(iqs269->keypad);
1286
1287        return 0;
1288}
1289
1290static irqreturn_t iqs269_irq(int irq, void *context)
1291{
1292        struct iqs269_private *iqs269 = context;
1293
1294        if (iqs269_report(iqs269))
1295                return IRQ_NONE;
1296
1297        /*
1298         * The device does not deassert its interrupt (RDY) pin until shortly
1299         * after receiving an I2C stop condition; the following delay ensures
1300         * the interrupt handler does not return before this time.
1301         */
1302        iqs269_irq_wait();
1303
1304        return IRQ_HANDLED;
1305}
1306
1307static ssize_t counts_show(struct device *dev,
1308                           struct device_attribute *attr, char *buf)
1309{
1310        struct iqs269_private *iqs269 = dev_get_drvdata(dev);
1311        struct i2c_client *client = iqs269->client;
1312        __le16 counts;
1313        int error;
1314
1315        if (!iqs269->ati_current || iqs269->hall_enable)
1316                return -EPERM;
1317
1318        /*
1319         * Unsolicited I2C communication prompts the device to assert its RDY
1320         * pin, so disable the interrupt line until the operation is finished
1321         * and RDY has been deasserted.
1322         */
1323        disable_irq(client->irq);
1324
1325        error = regmap_raw_read(iqs269->regmap,
1326                                IQS269_CHx_COUNTS + iqs269->ch_num * 2,
1327                                &counts, sizeof(counts));
1328
1329        iqs269_irq_wait();
1330        enable_irq(client->irq);
1331
1332        if (error)
1333                return error;
1334
1335        return scnprintf(buf, PAGE_SIZE, "%u\n", le16_to_cpu(counts));
1336}
1337
1338static ssize_t hall_bin_show(struct device *dev,
1339                             struct device_attribute *attr, char *buf)
1340{
1341        struct iqs269_private *iqs269 = dev_get_drvdata(dev);
1342        struct i2c_client *client = iqs269->client;
1343        unsigned int val;
1344        int error;
1345
1346        disable_irq(client->irq);
1347
1348        error = regmap_read(iqs269->regmap, IQS269_CAL_DATA_A, &val);
1349
1350        iqs269_irq_wait();
1351        enable_irq(client->irq);
1352
1353        if (error)
1354                return error;
1355
1356        switch (iqs269->ch_reg[IQS269_CHx_HALL_ACTIVE].rx_enable &
1357                iqs269->ch_reg[IQS269_CHx_HALL_INACTIVE].rx_enable) {
1358        case IQS269_HALL_PAD_R:
1359                val &= IQS269_CAL_DATA_A_HALL_BIN_R_MASK;
1360                val >>= IQS269_CAL_DATA_A_HALL_BIN_R_SHIFT;
1361                break;
1362
1363        case IQS269_HALL_PAD_L:
1364                val &= IQS269_CAL_DATA_A_HALL_BIN_L_MASK;
1365                val >>= IQS269_CAL_DATA_A_HALL_BIN_L_SHIFT;
1366                break;
1367
1368        default:
1369                return -EINVAL;
1370        }
1371
1372        return scnprintf(buf, PAGE_SIZE, "%u\n", val);
1373}
1374
1375static ssize_t hall_enable_show(struct device *dev,
1376                                struct device_attribute *attr, char *buf)
1377{
1378        struct iqs269_private *iqs269 = dev_get_drvdata(dev);
1379
1380        return scnprintf(buf, PAGE_SIZE, "%u\n", iqs269->hall_enable);
1381}
1382
1383static ssize_t hall_enable_store(struct device *dev,
1384                                 struct device_attribute *attr, const char *buf,
1385                                 size_t count)
1386{
1387        struct iqs269_private *iqs269 = dev_get_drvdata(dev);
1388        unsigned int val;
1389        int error;
1390
1391        error = kstrtouint(buf, 10, &val);
1392        if (error)
1393                return error;
1394
1395        mutex_lock(&iqs269->lock);
1396
1397        iqs269->hall_enable = val;
1398        iqs269->ati_current = false;
1399
1400        mutex_unlock(&iqs269->lock);
1401
1402        return count;
1403}
1404
1405static ssize_t ch_number_show(struct device *dev,
1406                              struct device_attribute *attr, char *buf)
1407{
1408        struct iqs269_private *iqs269 = dev_get_drvdata(dev);
1409
1410        return scnprintf(buf, PAGE_SIZE, "%u\n", iqs269->ch_num);
1411}
1412
1413static ssize_t ch_number_store(struct device *dev,
1414                               struct device_attribute *attr, const char *buf,
1415                               size_t count)
1416{
1417        struct iqs269_private *iqs269 = dev_get_drvdata(dev);
1418        unsigned int val;
1419        int error;
1420
1421        error = kstrtouint(buf, 10, &val);
1422        if (error)
1423                return error;
1424
1425        if (val >= IQS269_NUM_CH)
1426                return -EINVAL;
1427
1428        iqs269->ch_num = val;
1429
1430        return count;
1431}
1432
1433static ssize_t rx_enable_show(struct device *dev,
1434                              struct device_attribute *attr, char *buf)
1435{
1436        struct iqs269_private *iqs269 = dev_get_drvdata(dev);
1437
1438        return scnprintf(buf, PAGE_SIZE, "%u\n",
1439                         iqs269->ch_reg[iqs269->ch_num].rx_enable);
1440}
1441
1442static ssize_t rx_enable_store(struct device *dev,
1443                               struct device_attribute *attr, const char *buf,
1444                               size_t count)
1445{
1446        struct iqs269_private *iqs269 = dev_get_drvdata(dev);
1447        unsigned int val;
1448        int error;
1449
1450        error = kstrtouint(buf, 10, &val);
1451        if (error)
1452                return error;
1453
1454        if (val > 0xFF)
1455                return -EINVAL;
1456
1457        mutex_lock(&iqs269->lock);
1458
1459        iqs269->ch_reg[iqs269->ch_num].rx_enable = val;
1460        iqs269->ati_current = false;
1461
1462        mutex_unlock(&iqs269->lock);
1463
1464        return count;
1465}
1466
1467static ssize_t ati_mode_show(struct device *dev,
1468                             struct device_attribute *attr, char *buf)
1469{
1470        struct iqs269_private *iqs269 = dev_get_drvdata(dev);
1471        unsigned int val;
1472        int error;
1473
1474        error = iqs269_ati_mode_get(iqs269, iqs269->ch_num, &val);
1475        if (error)
1476                return error;
1477
1478        return scnprintf(buf, PAGE_SIZE, "%u\n", val);
1479}
1480
1481static ssize_t ati_mode_store(struct device *dev,
1482                              struct device_attribute *attr, const char *buf,
1483                              size_t count)
1484{
1485        struct iqs269_private *iqs269 = dev_get_drvdata(dev);
1486        unsigned int val;
1487        int error;
1488
1489        error = kstrtouint(buf, 10, &val);
1490        if (error)
1491                return error;
1492
1493        error = iqs269_ati_mode_set(iqs269, iqs269->ch_num, val);
1494        if (error)
1495                return error;
1496
1497        return count;
1498}
1499
1500static ssize_t ati_base_show(struct device *dev,
1501                             struct device_attribute *attr, char *buf)
1502{
1503        struct iqs269_private *iqs269 = dev_get_drvdata(dev);
1504        unsigned int val;
1505        int error;
1506
1507        error = iqs269_ati_base_get(iqs269, iqs269->ch_num, &val);
1508        if (error)
1509                return error;
1510
1511        return scnprintf(buf, PAGE_SIZE, "%u\n", val);
1512}
1513
1514static ssize_t ati_base_store(struct device *dev,
1515                              struct device_attribute *attr, const char *buf,
1516                              size_t count)
1517{
1518        struct iqs269_private *iqs269 = dev_get_drvdata(dev);
1519        unsigned int val;
1520        int error;
1521
1522        error = kstrtouint(buf, 10, &val);
1523        if (error)
1524                return error;
1525
1526        error = iqs269_ati_base_set(iqs269, iqs269->ch_num, val);
1527        if (error)
1528                return error;
1529
1530        return count;
1531}
1532
1533static ssize_t ati_target_show(struct device *dev,
1534                               struct device_attribute *attr, char *buf)
1535{
1536        struct iqs269_private *iqs269 = dev_get_drvdata(dev);
1537        unsigned int val;
1538        int error;
1539
1540        error = iqs269_ati_target_get(iqs269, iqs269->ch_num, &val);
1541        if (error)
1542                return error;
1543
1544        return scnprintf(buf, PAGE_SIZE, "%u\n", val);
1545}
1546
1547static ssize_t ati_target_store(struct device *dev,
1548                                struct device_attribute *attr, const char *buf,
1549                                size_t count)
1550{
1551        struct iqs269_private *iqs269 = dev_get_drvdata(dev);
1552        unsigned int val;
1553        int error;
1554
1555        error = kstrtouint(buf, 10, &val);
1556        if (error)
1557                return error;
1558
1559        error = iqs269_ati_target_set(iqs269, iqs269->ch_num, val);
1560        if (error)
1561                return error;
1562
1563        return count;
1564}
1565
1566static ssize_t ati_trigger_show(struct device *dev,
1567                                struct device_attribute *attr, char *buf)
1568{
1569        struct iqs269_private *iqs269 = dev_get_drvdata(dev);
1570
1571        return scnprintf(buf, PAGE_SIZE, "%u\n", iqs269->ati_current);
1572}
1573
1574static ssize_t ati_trigger_store(struct device *dev,
1575                                 struct device_attribute *attr, const char *buf,
1576                                 size_t count)
1577{
1578        struct iqs269_private *iqs269 = dev_get_drvdata(dev);
1579        struct i2c_client *client = iqs269->client;
1580        unsigned int val;
1581        int error;
1582
1583        error = kstrtouint(buf, 10, &val);
1584        if (error)
1585                return error;
1586
1587        if (!val)
1588                return count;
1589
1590        disable_irq(client->irq);
1591
1592        error = iqs269_dev_init(iqs269);
1593
1594        iqs269_irq_wait();
1595        enable_irq(client->irq);
1596
1597        if (error)
1598                return error;
1599
1600        return count;
1601}
1602
1603static DEVICE_ATTR_RO(counts);
1604static DEVICE_ATTR_RO(hall_bin);
1605static DEVICE_ATTR_RW(hall_enable);
1606static DEVICE_ATTR_RW(ch_number);
1607static DEVICE_ATTR_RW(rx_enable);
1608static DEVICE_ATTR_RW(ati_mode);
1609static DEVICE_ATTR_RW(ati_base);
1610static DEVICE_ATTR_RW(ati_target);
1611static DEVICE_ATTR_RW(ati_trigger);
1612
1613static struct attribute *iqs269_attrs[] = {
1614        &dev_attr_counts.attr,
1615        &dev_attr_hall_bin.attr,
1616        &dev_attr_hall_enable.attr,
1617        &dev_attr_ch_number.attr,
1618        &dev_attr_rx_enable.attr,
1619        &dev_attr_ati_mode.attr,
1620        &dev_attr_ati_base.attr,
1621        &dev_attr_ati_target.attr,
1622        &dev_attr_ati_trigger.attr,
1623        NULL,
1624};
1625
1626static const struct attribute_group iqs269_attr_group = {
1627        .attrs = iqs269_attrs,
1628};
1629
1630static const struct regmap_config iqs269_regmap_config = {
1631        .reg_bits = 8,
1632        .val_bits = 16,
1633        .max_register = IQS269_MAX_REG,
1634};
1635
1636static int iqs269_probe(struct i2c_client *client)
1637{
1638        struct iqs269_ver_info ver_info;
1639        struct iqs269_private *iqs269;
1640        int error;
1641
1642        iqs269 = devm_kzalloc(&client->dev, sizeof(*iqs269), GFP_KERNEL);
1643        if (!iqs269)
1644                return -ENOMEM;
1645
1646        i2c_set_clientdata(client, iqs269);
1647        iqs269->client = client;
1648
1649        iqs269->regmap = devm_regmap_init_i2c(client, &iqs269_regmap_config);
1650        if (IS_ERR(iqs269->regmap)) {
1651                error = PTR_ERR(iqs269->regmap);
1652                dev_err(&client->dev, "Failed to initialize register map: %d\n",
1653                        error);
1654                return error;
1655        }
1656
1657        mutex_init(&iqs269->lock);
1658
1659        error = regmap_raw_read(iqs269->regmap, IQS269_VER_INFO, &ver_info,
1660                                sizeof(ver_info));
1661        if (error)
1662                return error;
1663
1664        if (ver_info.prod_num != IQS269_VER_INFO_PROD_NUM) {
1665                dev_err(&client->dev, "Unrecognized product number: 0x%02X\n",
1666                        ver_info.prod_num);
1667                return -EINVAL;
1668        }
1669
1670        error = iqs269_parse_prop(iqs269);
1671        if (error)
1672                return error;
1673
1674        error = iqs269_dev_init(iqs269);
1675        if (error) {
1676                dev_err(&client->dev, "Failed to initialize device: %d\n",
1677                        error);
1678                return error;
1679        }
1680
1681        error = iqs269_input_init(iqs269);
1682        if (error)
1683                return error;
1684
1685        error = devm_request_threaded_irq(&client->dev, client->irq,
1686                                          NULL, iqs269_irq, IRQF_ONESHOT,
1687                                          client->name, iqs269);
1688        if (error) {
1689                dev_err(&client->dev, "Failed to request IRQ: %d\n", error);
1690                return error;
1691        }
1692
1693        error = devm_device_add_group(&client->dev, &iqs269_attr_group);
1694        if (error)
1695                dev_err(&client->dev, "Failed to add attributes: %d\n", error);
1696
1697        return error;
1698}
1699
1700static int __maybe_unused iqs269_suspend(struct device *dev)
1701{
1702        struct iqs269_private *iqs269 = dev_get_drvdata(dev);
1703        struct i2c_client *client = iqs269->client;
1704        unsigned int val;
1705        int error;
1706
1707        if (!iqs269->suspend_mode)
1708                return 0;
1709
1710        disable_irq(client->irq);
1711
1712        /*
1713         * Automatic power mode switching must be disabled before the device is
1714         * forced into any particular power mode. In this case, the device will
1715         * transition into normal-power mode.
1716         */
1717        error = regmap_update_bits(iqs269->regmap, IQS269_SYS_SETTINGS,
1718                                   IQS269_SYS_SETTINGS_DIS_AUTO, ~0);
1719        if (error)
1720                goto err_irq;
1721
1722        /*
1723         * The following check ensures the device has completed its transition
1724         * into normal-power mode before a manual mode switch is performed.
1725         */
1726        error = regmap_read_poll_timeout(iqs269->regmap, IQS269_SYS_FLAGS, val,
1727                                        !(val & IQS269_SYS_FLAGS_PWR_MODE_MASK),
1728                                         IQS269_PWR_MODE_POLL_SLEEP_US,
1729                                         IQS269_PWR_MODE_POLL_TIMEOUT_US);
1730        if (error)
1731                goto err_irq;
1732
1733        error = regmap_update_bits(iqs269->regmap, IQS269_SYS_SETTINGS,
1734                                   IQS269_SYS_SETTINGS_PWR_MODE_MASK,
1735                                   iqs269->suspend_mode <<
1736                                   IQS269_SYS_SETTINGS_PWR_MODE_SHIFT);
1737        if (error)
1738                goto err_irq;
1739
1740        /*
1741         * This last check ensures the device has completed its transition into
1742         * the desired power mode to prevent any spurious interrupts from being
1743         * triggered after iqs269_suspend has already returned.
1744         */
1745        error = regmap_read_poll_timeout(iqs269->regmap, IQS269_SYS_FLAGS, val,
1746                                         (val & IQS269_SYS_FLAGS_PWR_MODE_MASK)
1747                                         == (iqs269->suspend_mode <<
1748                                             IQS269_SYS_FLAGS_PWR_MODE_SHIFT),
1749                                         IQS269_PWR_MODE_POLL_SLEEP_US,
1750                                         IQS269_PWR_MODE_POLL_TIMEOUT_US);
1751
1752err_irq:
1753        iqs269_irq_wait();
1754        enable_irq(client->irq);
1755
1756        return error;
1757}
1758
1759static int __maybe_unused iqs269_resume(struct device *dev)
1760{
1761        struct iqs269_private *iqs269 = dev_get_drvdata(dev);
1762        struct i2c_client *client = iqs269->client;
1763        unsigned int val;
1764        int error;
1765
1766        if (!iqs269->suspend_mode)
1767                return 0;
1768
1769        disable_irq(client->irq);
1770
1771        error = regmap_update_bits(iqs269->regmap, IQS269_SYS_SETTINGS,
1772                                   IQS269_SYS_SETTINGS_PWR_MODE_MASK, 0);
1773        if (error)
1774                goto err_irq;
1775
1776        /*
1777         * This check ensures the device has returned to normal-power mode
1778         * before automatic power mode switching is re-enabled.
1779         */
1780        error = regmap_read_poll_timeout(iqs269->regmap, IQS269_SYS_FLAGS, val,
1781                                        !(val & IQS269_SYS_FLAGS_PWR_MODE_MASK),
1782                                         IQS269_PWR_MODE_POLL_SLEEP_US,
1783                                         IQS269_PWR_MODE_POLL_TIMEOUT_US);
1784        if (error)
1785                goto err_irq;
1786
1787        error = regmap_update_bits(iqs269->regmap, IQS269_SYS_SETTINGS,
1788                                   IQS269_SYS_SETTINGS_DIS_AUTO, 0);
1789        if (error)
1790                goto err_irq;
1791
1792        /*
1793         * This step reports any events that may have been "swallowed" as a
1794         * result of polling PWR_MODE (which automatically acknowledges any
1795         * pending interrupts).
1796         */
1797        error = iqs269_report(iqs269);
1798
1799err_irq:
1800        iqs269_irq_wait();
1801        enable_irq(client->irq);
1802
1803        return error;
1804}
1805
1806static SIMPLE_DEV_PM_OPS(iqs269_pm, iqs269_suspend, iqs269_resume);
1807
1808static const struct of_device_id iqs269_of_match[] = {
1809        { .compatible = "azoteq,iqs269a" },
1810        { }
1811};
1812MODULE_DEVICE_TABLE(of, iqs269_of_match);
1813
1814static struct i2c_driver iqs269_i2c_driver = {
1815        .driver = {
1816                .name = "iqs269a",
1817                .of_match_table = iqs269_of_match,
1818                .pm = &iqs269_pm,
1819        },
1820        .probe_new = iqs269_probe,
1821};
1822module_i2c_driver(iqs269_i2c_driver);
1823
1824MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
1825MODULE_DESCRIPTION("Azoteq IQS269A Capacitive Touch Controller");
1826MODULE_LICENSE("GPL");
1827
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