drivers/iio/adc/palmas_gpadc.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * palmas-adc.c -- TI PALMAS GPADC.
   4  *
   5  * Copyright (c) 2013, NVIDIA Corporation. All rights reserved.
   6  *
   7  * Author: Pradeep Goudagunta <pgoudagunta@nvidia.com>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/err.h>
  12 #include <linux/irq.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/slab.h>
  16 #include <linux/delay.h>
  17 #include <linux/i2c.h>
  18 #include <linux/pm.h>
  19 #include <linux/mfd/palmas.h>
  20 #include <linux/completion.h>
  21 #include <linux/of.h>
  22 #include <linux/of_device.h>
  23 #include <linux/iio/events.h>
  24 #include <linux/iio/iio.h>
  25 #include <linux/iio/machine.h>
  26 #include <linux/iio/driver.h>
  27
  28 #define MOD_NAME "palmas-gpadc"
  29 #define PALMAS_ADC_CONVERSION_TIMEOUT   (msecs_to_jiffies(5000))
  30 #define PALMAS_TO_BE_CALCULATED 0
  31 #define PALMAS_GPADC_TRIMINVALID        -1
  32
  33 struct palmas_gpadc_info {
  34 /* calibration codes and regs */
  35         int x1; /* lower ideal code */
  36         int x2; /* higher ideal code */
  37         int v1; /* expected lower volt reading */
  38         int v2; /* expected higher volt reading */
  39         u8 trim1_reg;   /* register number for lower trim */
  40         u8 trim2_reg;   /* register number for upper trim */
  41         int gain;       /* calculated from above (after reading trim regs) */
  42         int offset;     /* calculated from above (after reading trim regs) */
  43         int gain_error; /* calculated from above (after reading trim regs) */
  44         bool is_uncalibrated;   /* if channel has calibration data */
  45 };
  46
  47 #define PALMAS_ADC_INFO(_chan, _x1, _x2, _v1, _v2, _t1, _t2, _is_uncalibrated) \
  48         [PALMAS_ADC_CH_##_chan] = { \
  49                 .x1 = _x1, \
  50                 .x2 = _x2, \
  51                 .v1 = _v1, \
  52                 .v2 = _v2, \
  53                 .gain = PALMAS_TO_BE_CALCULATED, \
  54                 .offset = PALMAS_TO_BE_CALCULATED, \
  55                 .gain_error = PALMAS_TO_BE_CALCULATED, \
  56                 .trim1_reg = PALMAS_GPADC_TRIM##_t1, \
  57                 .trim2_reg = PALMAS_GPADC_TRIM##_t2,  \
  58                 .is_uncalibrated = _is_uncalibrated \
  59         }
  60
  61 static struct palmas_gpadc_info palmas_gpadc_info[] = {
  62         PALMAS_ADC_INFO(IN0, 2064, 3112, 630, 950, 1, 2, false),
  63         PALMAS_ADC_INFO(IN1, 2064, 3112, 630, 950, 1, 2, false),
  64         PALMAS_ADC_INFO(IN2, 2064, 3112, 1260, 1900, 3, 4, false),
  65         PALMAS_ADC_INFO(IN3, 2064, 3112, 630, 950, 1, 2, false),
  66         PALMAS_ADC_INFO(IN4, 2064, 3112, 630, 950, 1, 2, false),
  67         PALMAS_ADC_INFO(IN5, 2064, 3112, 630, 950, 1, 2, false),
  68         PALMAS_ADC_INFO(IN6, 2064, 3112, 2520, 3800, 5, 6, false),
  69         PALMAS_ADC_INFO(IN7, 2064, 3112, 2520, 3800, 7, 8, false),
  70         PALMAS_ADC_INFO(IN8, 2064, 3112, 3150, 4750, 9, 10, false),
  71         PALMAS_ADC_INFO(IN9, 2064, 3112, 5670, 8550, 11, 12, false),
  72         PALMAS_ADC_INFO(IN10, 2064, 3112, 3465, 5225, 13, 14, false),
  73         PALMAS_ADC_INFO(IN11, 0, 0, 0, 0, INVALID, INVALID, true),
  74         PALMAS_ADC_INFO(IN12, 0, 0, 0, 0, INVALID, INVALID, true),
  75         PALMAS_ADC_INFO(IN13, 0, 0, 0, 0, INVALID, INVALID, true),
  76         PALMAS_ADC_INFO(IN14, 2064, 3112, 3645, 5225, 15, 16, false),
  77         PALMAS_ADC_INFO(IN15, 0, 0, 0, 0, INVALID, INVALID, true),
  78 };
  79
  80 struct palmas_adc_event {
  81         bool enabled;
  82         int channel;
  83         enum iio_event_direction direction;
  84 };
  85
  86 struct palmas_gpadc_thresholds {
  87         int high;
  88         int low;
  89 };
  90
  91 /*
  92  * struct palmas_gpadc - the palmas_gpadc structure
  93  * @ch0_current:        channel 0 current source setting
  94  *                      0: 0 uA
  95  *                      1: 5 uA
  96  *                      2: 15 uA
  97  *                      3: 20 uA
  98  * @ch3_current:        channel 0 current source setting
  99  *                      0: 0 uA
 100  *                      1: 10 uA
 101  *                      2: 400 uA
 102  *                      3: 800 uA
 103  * @extended_delay:     enable the gpadc extended delay mode
 104  * @auto_conversion_period:     define the auto_conversion_period
 105  * @lock:       Lock to protect the device state during a potential concurrent
 106  *              read access from userspace. Reading a raw value requires a sequence
 107  *              of register writes, then a wait for a completion callback,
 108  *              and finally a register read, during which userspace could issue
 109  *              another read request. This lock protects a read access from
 110  *              ocurring before another one has finished.
 111  *
 112  * This is the palmas_gpadc structure to store run-time information
 113  * and pointers for this driver instance.
 114  */
 115 struct palmas_gpadc {
 116         struct device                   *dev;
 117         struct palmas                   *palmas;
 118         u8                              ch0_current;
 119         u8                              ch3_current;
 120         bool                            extended_delay;
 121         int                             irq;
 122         int                             irq_auto_0;
 123         int                             irq_auto_1;
 124         struct palmas_gpadc_info        *adc_info;
 125         struct completion               conv_completion;
 126         struct palmas_adc_event         event0;
 127         struct palmas_adc_event         event1;
 128         struct palmas_gpadc_thresholds  thresholds[PALMAS_ADC_CH_MAX];
 129         int                             auto_conversion_period;
 130         struct mutex                    lock;
 131 };
 132
 133 static struct palmas_adc_event *palmas_gpadc_get_event(struct palmas_gpadc *adc,
 134                                                        int adc_chan,
 135                                                        enum iio_event_direction dir)
 136 {
 137         if (adc_chan == adc->event0.channel && dir == adc->event0.direction)
 138                 return &adc->event0;
 139
 140         if (adc_chan == adc->event1.channel && dir == adc->event1.direction)
 141                 return &adc->event1;
 142
 143         return NULL;
 144 }
 145
 146 static bool palmas_gpadc_channel_is_freerunning(struct palmas_gpadc *adc,
 147                                                 int adc_chan)
 148 {
 149         return palmas_gpadc_get_event(adc, adc_chan, IIO_EV_DIR_RISING) ||
 150                 palmas_gpadc_get_event(adc, adc_chan, IIO_EV_DIR_FALLING);
 151 }
 152
 153 /*
 154  * GPADC lock issue in AUTO mode.
 155  * Impact: In AUTO mode, GPADC conversion can be locked after disabling AUTO
 156  *         mode feature.
 157  * Details:
 158  *      When the AUTO mode is the only conversion mode enabled, if the AUTO
 159  *      mode feature is disabled with bit GPADC_AUTO_CTRL.  AUTO_CONV1_EN = 0
 160  *      or bit GPADC_AUTO_CTRL.  AUTO_CONV0_EN = 0 during a conversion, the
 161  *      conversion mechanism can be seen as locked meaning that all following
 162  *      conversion will give 0 as a result.  Bit GPADC_STATUS.GPADC_AVAILABLE
 163  *      will stay at 0 meaning that GPADC is busy.  An RT conversion can unlock
 164  *      the GPADC.
 165  *
 166  * Workaround(s):
 167  *      To avoid the lock mechanism, the workaround to follow before any stop
 168  *      conversion request is:
 169  *      Force the GPADC state machine to be ON by using the GPADC_CTRL1.
 170  *              GPADC_FORCE bit = 1
 171  *      Shutdown the GPADC AUTO conversion using
 172  *              GPADC_AUTO_CTRL.SHUTDOWN_CONV[01] = 0.
 173  *      After 100us, force the GPADC state machine to be OFF by using the
 174  *              GPADC_CTRL1.  GPADC_FORCE bit = 0
 175  */
 176
 177 static int palmas_disable_auto_conversion(struct palmas_gpadc *adc)
 178 {
 179         int ret;
 180
 181         ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
 182                         PALMAS_GPADC_CTRL1,
 183                         PALMAS_GPADC_CTRL1_GPADC_FORCE,
 184                         PALMAS_GPADC_CTRL1_GPADC_FORCE);
 185         if (ret < 0) {
 186                 dev_err(adc->dev, "GPADC_CTRL1 update failed: %d\n", ret);
 187                 return ret;
 188         }
 189
 190         ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
 191                         PALMAS_GPADC_AUTO_CTRL,
 192                         PALMAS_GPADC_AUTO_CTRL_SHUTDOWN_CONV1 |
 193                         PALMAS_GPADC_AUTO_CTRL_SHUTDOWN_CONV0,
 194                         0);
 195         if (ret < 0) {
 196                 dev_err(adc->dev, "AUTO_CTRL update failed: %d\n", ret);
 197                 return ret;
 198         }
 199
 200         udelay(100);
 201
 202         ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
 203                         PALMAS_GPADC_CTRL1,
 204                         PALMAS_GPADC_CTRL1_GPADC_FORCE, 0);
 205         if (ret < 0)
 206                 dev_err(adc->dev, "GPADC_CTRL1 update failed: %d\n", ret);
 207
 208         return ret;
 209 }
 210
 211 static irqreturn_t palmas_gpadc_irq(int irq, void *data)
 212 {
 213         struct palmas_gpadc *adc = data;
 214
 215         complete(&adc->conv_completion);
 216
 217         return IRQ_HANDLED;
 218 }
 219
 220 static irqreturn_t palmas_gpadc_irq_auto(int irq, void *data)
 221 {
 222         struct iio_dev *indio_dev = data;
 223         struct palmas_gpadc *adc = iio_priv(indio_dev);
 224         struct palmas_adc_event *ev;
 225
 226         dev_dbg(adc->dev, "Threshold interrupt %d occurs\n", irq);
 227         palmas_disable_auto_conversion(adc);
 228
 229         ev = (irq == adc->irq_auto_0) ? &adc->event0 : &adc->event1;
 230         if (ev->channel != -1) {
 231                 enum iio_event_direction dir;
 232                 u64 code;
 233
 234                 dir = ev->direction;
 235                 code = IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, ev->channel,
 236                                             IIO_EV_TYPE_THRESH, dir);
 237                 iio_push_event(indio_dev, code, iio_get_time_ns(indio_dev));
 238         }
 239
 240         return IRQ_HANDLED;
 241 }
 242
 243 static int palmas_gpadc_start_mask_interrupt(struct palmas_gpadc *adc,
 244                                                 bool mask)
 245 {
 246         int ret;
 247
 248         if (!mask)
 249                 ret = palmas_update_bits(adc->palmas, PALMAS_INTERRUPT_BASE,
 250                                         PALMAS_INT3_MASK,
 251                                         PALMAS_INT3_MASK_GPADC_EOC_SW, 0);
 252         else
 253                 ret = palmas_update_bits(adc->palmas, PALMAS_INTERRUPT_BASE,
 254                                         PALMAS_INT3_MASK,
 255                                         PALMAS_INT3_MASK_GPADC_EOC_SW,
 256                                         PALMAS_INT3_MASK_GPADC_EOC_SW);
 257         if (ret < 0)
 258                 dev_err(adc->dev, "GPADC INT MASK update failed: %d\n", ret);
 259
 260         return ret;
 261 }
 262
 263 static int palmas_gpadc_enable(struct palmas_gpadc *adc, int adc_chan,
 264                                int enable)
 265 {
 266         unsigned int mask, val;
 267         int ret;
 268
 269         if (enable) {
 270                 val = (adc->extended_delay
 271                         << PALMAS_GPADC_RT_CTRL_EXTEND_DELAY_SHIFT);
 272                 ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
 273                                         PALMAS_GPADC_RT_CTRL,
 274                                         PALMAS_GPADC_RT_CTRL_EXTEND_DELAY, val);
 275                 if (ret < 0) {
 276                         dev_err(adc->dev, "RT_CTRL update failed: %d\n", ret);
 277                         return ret;
 278                 }
 279
 280                 mask = (PALMAS_GPADC_CTRL1_CURRENT_SRC_CH0_MASK |
 281                         PALMAS_GPADC_CTRL1_CURRENT_SRC_CH3_MASK |
 282                         PALMAS_GPADC_CTRL1_GPADC_FORCE);
 283                 val = (adc->ch0_current
 284                         << PALMAS_GPADC_CTRL1_CURRENT_SRC_CH0_SHIFT);
 285                 val |= (adc->ch3_current
 286                         << PALMAS_GPADC_CTRL1_CURRENT_SRC_CH3_SHIFT);
 287                 val |= PALMAS_GPADC_CTRL1_GPADC_FORCE;
 288                 ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
 289                                 PALMAS_GPADC_CTRL1, mask, val);
 290                 if (ret < 0) {
 291                         dev_err(adc->dev,
 292                                 "Failed to update current setting: %d\n", ret);
 293                         return ret;
 294                 }
 295
 296                 mask = (PALMAS_GPADC_SW_SELECT_SW_CONV0_SEL_MASK |
 297                         PALMAS_GPADC_SW_SELECT_SW_CONV_EN);
 298                 val = (adc_chan | PALMAS_GPADC_SW_SELECT_SW_CONV_EN);
 299                 ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
 300                                 PALMAS_GPADC_SW_SELECT, mask, val);
 301                 if (ret < 0) {
 302                         dev_err(adc->dev, "SW_SELECT update failed: %d\n", ret);
 303                         return ret;
 304                 }
 305         } else {
 306                 ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
 307                                 PALMAS_GPADC_SW_SELECT, 0);
 308                 if (ret < 0)
 309                         dev_err(adc->dev, "SW_SELECT write failed: %d\n", ret);
 310
 311                 ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
 312                                 PALMAS_GPADC_CTRL1,
 313                                 PALMAS_GPADC_CTRL1_GPADC_FORCE, 0);
 314                 if (ret < 0) {
 315                         dev_err(adc->dev, "CTRL1 update failed: %d\n", ret);
 316                         return ret;
 317                 }
 318         }
 319
 320         return ret;
 321 }
 322
 323 static int palmas_gpadc_read_prepare(struct palmas_gpadc *adc, int adc_chan)
 324 {
 325         int ret;
 326
 327         if (palmas_gpadc_channel_is_freerunning(adc, adc_chan))
 328                 return 0; /* ADC already running */
 329
 330         ret = palmas_gpadc_enable(adc, adc_chan, true);
 331         if (ret < 0)
 332                 return ret;
 333
 334         return palmas_gpadc_start_mask_interrupt(adc, 0);
 335 }
 336
 337 static void palmas_gpadc_read_done(struct palmas_gpadc *adc, int adc_chan)
 338 {
 339         palmas_gpadc_start_mask_interrupt(adc, 1);
 340         palmas_gpadc_enable(adc, adc_chan, false);
 341 }
 342
 343 static int palmas_gpadc_calibrate(struct palmas_gpadc *adc, int adc_chan)
 344 {
 345         int k;
 346         int d1;
 347         int d2;
 348         int ret;
 349         int gain;
 350         int x1 =  adc->adc_info[adc_chan].x1;
 351         int x2 =  adc->adc_info[adc_chan].x2;
 352         int v1 = adc->adc_info[adc_chan].v1;
 353         int v2 = adc->adc_info[adc_chan].v2;
 354
 355         ret = palmas_read(adc->palmas, PALMAS_TRIM_GPADC_BASE,
 356                                 adc->adc_info[adc_chan].trim1_reg, &d1);
 357         if (ret < 0) {
 358                 dev_err(adc->dev, "TRIM read failed: %d\n", ret);
 359                 goto scrub;
 360         }
 361
 362         ret = palmas_read(adc->palmas, PALMAS_TRIM_GPADC_BASE,
 363                                 adc->adc_info[adc_chan].trim2_reg, &d2);
 364         if (ret < 0) {
 365                 dev_err(adc->dev, "TRIM read failed: %d\n", ret);
 366                 goto scrub;
 367         }
 368
 369         /* gain error calculation */
 370         k = (1000 + (1000 * (d2 - d1)) / (x2 - x1));
 371
 372         /* gain calculation */
 373         gain = ((v2 - v1) * 1000) / (x2 - x1);
 374
 375         adc->adc_info[adc_chan].gain_error = k;
 376         adc->adc_info[adc_chan].gain = gain;
 377         /* offset Calculation */
 378         adc->adc_info[adc_chan].offset = (d1 * 1000) - ((k - 1000) * x1);
 379
 380 scrub:
 381         return ret;
 382 }
 383
 384 static int palmas_gpadc_start_conversion(struct palmas_gpadc *adc, int adc_chan)
 385 {
 386         unsigned int val;
 387         int ret;
 388
 389         if (palmas_gpadc_channel_is_freerunning(adc, adc_chan)) {
 390                 int event = (adc_chan == adc->event0.channel) ? 0 : 1;
 391                 unsigned int reg = (event == 0) ?
 392                         PALMAS_GPADC_AUTO_CONV0_LSB :
 393                         PALMAS_GPADC_AUTO_CONV1_LSB;
 394
 395                 ret = palmas_bulk_read(adc->palmas, PALMAS_GPADC_BASE,
 396                                         reg, &val, 2);
 397                 if (ret < 0) {
 398                         dev_err(adc->dev, "AUTO_CONV%x_LSB read failed: %d\n",
 399                                 event, ret);
 400                         return ret;
 401                 }
 402         } else {
 403                 init_completion(&adc->conv_completion);
 404                 ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
 405                                         PALMAS_GPADC_SW_SELECT,
 406                                         PALMAS_GPADC_SW_SELECT_SW_START_CONV0,
 407                                         PALMAS_GPADC_SW_SELECT_SW_START_CONV0);
 408                 if (ret < 0) {
 409                         dev_err(adc->dev, "SELECT_SW_START write failed: %d\n", ret);
 410                         return ret;
 411                 }
 412
 413                 ret = wait_for_completion_timeout(&adc->conv_completion,
 414                                         PALMAS_ADC_CONVERSION_TIMEOUT);
 415                 if (ret == 0) {
 416                         dev_err(adc->dev, "conversion not completed\n");
 417                         return -ETIMEDOUT;
 418                 }
 419
 420                 ret = palmas_bulk_read(adc->palmas, PALMAS_GPADC_BASE,
 421                                         PALMAS_GPADC_SW_CONV0_LSB, &val, 2);
 422                 if (ret < 0) {
 423                         dev_err(adc->dev, "SW_CONV0_LSB read failed: %d\n", ret);
 424                         return ret;
 425                 }
 426         }
 427
 428         ret = val & 0xFFF;
 429
 430         return ret;
 431 }
 432
 433 static int palmas_gpadc_get_calibrated_code(struct palmas_gpadc *adc,
 434                                                 int adc_chan, int val)
 435 {
 436         if (!adc->adc_info[adc_chan].is_uncalibrated)
 437                 val  = (val*1000 - adc->adc_info[adc_chan].offset) /
 438                                         adc->adc_info[adc_chan].gain_error;
 439
 440         if (val < 0) {
 441                 if (val < -10)
 442                         dev_err(adc->dev, "Mismatch with calibration var = %d\n", val);
 443                 return 0;
 444         }
 445
 446         val = (val * adc->adc_info[adc_chan].gain) / 1000;
 447
 448         return val;
 449 }
 450
 451 /*
 452  * The high and low threshold values are calculated based on the advice given
 453  * in TI Application Report SLIA087A, "Guide to Using the GPADC in PS65903x,
 454  * TPS65917-Q1, TPS65919-Q1, and TPS65916 Devices". This document recommend
 455  * taking ADC tolerances into account and is based on the device integral non-
 456  * linearity (INL), offset error and gain error:
 457  *
 458  *   raw high threshold = (ideal threshold + INL) * gain error + offset error
 459  *
 460  * The gain error include both gain error, as specified in the datasheet, and
 461  * the gain error drift. These paramenters vary depending on device and whether
 462  * the the channel is calibrated (trimmed) or not.
 463  */
 464 static int palmas_gpadc_threshold_with_tolerance(int val, const int INL,
 465                                                  const int gain_error,
 466                                                  const int offset_error)
 467 {
 468         val = ((val + INL) * (1000 + gain_error)) / 1000 + offset_error;
 469
 470         return clamp(val, 0, 0xFFF);
 471 }
 472
 473 /*
 474  * The values below are taken from the datasheet of TWL6035, TWL6037.
 475  * todo: get max INL, gain error, and offset error from OF.
 476  */
 477 static int palmas_gpadc_get_high_threshold_raw(struct palmas_gpadc *adc,
 478                                                struct palmas_adc_event *ev)
 479 {
 480         const int adc_chan = ev->channel;
 481         int val = adc->thresholds[adc_chan].high;
 482         /* integral nonlinearity, measured in LSB */
 483         const int max_INL = 2;
 484         /* measured in LSB */
 485         int max_offset_error;
 486         /* 0.2% when calibrated */
 487         int max_gain_error = 2;
 488
 489         val = (val * 1000) / adc->adc_info[adc_chan].gain;
 490
 491         if (adc->adc_info[adc_chan].is_uncalibrated) {
 492                 /* 2% worse */
 493                 max_gain_error += 20;
 494                 max_offset_error = 36;
 495         } else {
 496                 val = (val * adc->adc_info[adc_chan].gain_error +
 497                        adc->adc_info[adc_chan].offset) /
 498                         1000;
 499                 max_offset_error = 2;
 500         }
 501
 502         return palmas_gpadc_threshold_with_tolerance(val,
 503                                                      max_INL,
 504                                                      max_gain_error,
 505                                                      max_offset_error);
 506 }
 507
 508 /*
 509  * The values below are taken from the datasheet of TWL6035, TWL6037.
 510  * todo: get min INL, gain error, and offset error from OF.
 511  */
 512 static int palmas_gpadc_get_low_threshold_raw(struct palmas_gpadc *adc,
 513                                               struct palmas_adc_event *ev)
 514 {
 515         const int adc_chan = ev->channel;
 516         int val = adc->thresholds[adc_chan].low;
 517         /* integral nonlinearity, measured in LSB */
 518         const int min_INL = -2;
 519         /* measured in LSB */
 520         int min_offset_error;
 521         /* -0.6% when calibrated */
 522         int min_gain_error = -6;
 523
 524         val = (val * 1000) / adc->adc_info[adc_chan].gain;
 525
 526         if (adc->adc_info[adc_chan].is_uncalibrated) {
 527                 /* 2% worse */
 528                 min_gain_error -= 20;
 529                 min_offset_error = -36;
 530         } else {
 531                 val = (val * adc->adc_info[adc_chan].gain_error -
 532                        adc->adc_info[adc_chan].offset) /
 533                         1000;
 534                 min_offset_error = -2;
 535         }
 536
 537         return palmas_gpadc_threshold_with_tolerance(val,
 538                                                      min_INL,
 539                                                      min_gain_error,
 540                                                      min_offset_error);
 541 }
 542
 543 static int palmas_gpadc_read_raw(struct iio_dev *indio_dev,
 544         struct iio_chan_spec const *chan, int *val, int *val2, long mask)
 545 {
 546         struct  palmas_gpadc *adc = iio_priv(indio_dev);
 547         int adc_chan = chan->channel;
 548         int ret = 0;
 549
 550         if (adc_chan >= PALMAS_ADC_CH_MAX)
 551                 return -EINVAL;
 552
 553         mutex_lock(&adc->lock);
 554
 555         switch (mask) {
 556         case IIO_CHAN_INFO_RAW:
 557         case IIO_CHAN_INFO_PROCESSED:
 558                 ret = palmas_gpadc_read_prepare(adc, adc_chan);
 559                 if (ret < 0)
 560                         goto out;
 561
 562                 ret = palmas_gpadc_start_conversion(adc, adc_chan);
 563                 if (ret < 0) {
 564                         dev_err(adc->dev,
 565                         "ADC start conversion failed\n");
 566                         goto out;
 567                 }
 568
 569                 if (mask == IIO_CHAN_INFO_PROCESSED)
 570                         ret = palmas_gpadc_get_calibrated_code(
 571                                                         adc, adc_chan, ret);
 572
 573                 *val = ret;
 574
 575                 ret = IIO_VAL_INT;
 576                 goto out;
 577         }
 578
 579         mutex_unlock(&adc->lock);
 580         return ret;
 581
 582 out:
 583         palmas_gpadc_read_done(adc, adc_chan);
 584         mutex_unlock(&adc->lock);
 585
 586         return ret;
 587 }
 588
 589 static int palmas_gpadc_read_event_config(struct iio_dev *indio_dev,
 590                                           const struct iio_chan_spec *chan,
 591                                           enum iio_event_type type,
 592                                           enum iio_event_direction dir)
 593 {
 594         struct palmas_gpadc *adc = iio_priv(indio_dev);
 595         int adc_chan = chan->channel;
 596         int ret = 0;
 597
 598         if (adc_chan >= PALMAS_ADC_CH_MAX || type != IIO_EV_TYPE_THRESH)
 599                 return -EINVAL;
 600
 601         mutex_lock(&adc->lock);
 602
 603         if (palmas_gpadc_get_event(adc, adc_chan, dir))
 604                 ret = 1;
 605
 606         mutex_unlock(&adc->lock);
 607
 608         return ret;
 609 }
 610
 611 static int palmas_adc_configure_events(struct palmas_gpadc *adc);
 612 static int palmas_adc_reset_events(struct palmas_gpadc *adc);
 613
 614 static int palmas_gpadc_reconfigure_event_channels(struct palmas_gpadc *adc)
 615 {
 616         return (adc->event0.enabled || adc->event1.enabled) ?
 617                 palmas_adc_configure_events(adc) :
 618                 palmas_adc_reset_events(adc);
 619 }
 620
 621 static int palmas_gpadc_enable_event_config(struct palmas_gpadc *adc,
 622                                             const struct iio_chan_spec *chan,
 623                                             enum iio_event_direction dir)
 624 {
 625         struct palmas_adc_event *ev;
 626         int adc_chan = chan->channel;
 627
 628         if (palmas_gpadc_get_event(adc, adc_chan, dir))
 629                 /* already enabled */
 630                 return 0;
 631
 632         if (adc->event0.channel == -1) {
 633                 ev = &adc->event0;
 634         } else if (adc->event1.channel == -1) {
 635                 /* event0 has to be the lowest channel */
 636                 if (adc_chan < adc->event0.channel) {
 637                         adc->event1 = adc->event0;
 638                         ev = &adc->event0;
 639                 } else {
 640                         ev = &adc->event1;
 641                 }
 642         } else { /* both AUTO channels already in use */
 643                 dev_warn(adc->dev, "event0 - %d, event1 - %d\n",
 644                          adc->event0.channel, adc->event1.channel);
 645                 return -EBUSY;
 646         }
 647
 648         ev->enabled = true;
 649         ev->channel = adc_chan;
 650         ev->direction = dir;
 651
 652         return palmas_gpadc_reconfigure_event_channels(adc);
 653 }
 654
 655 static int palmas_gpadc_disable_event_config(struct palmas_gpadc *adc,
 656                                              const struct iio_chan_spec *chan,
 657                                              enum iio_event_direction dir)
 658 {
 659         int adc_chan = chan->channel;
 660         struct palmas_adc_event *ev = palmas_gpadc_get_event(adc, adc_chan, dir);
 661
 662         if (!ev)
 663                 return 0;
 664
 665         if (ev == &adc->event0) {
 666                 adc->event0 = adc->event1;
 667                 ev = &adc->event1;
 668         }
 669
 670         ev->enabled = false;
 671         ev->channel = -1;
 672         ev->direction = IIO_EV_DIR_NONE;
 673
 674         return palmas_gpadc_reconfigure_event_channels(adc);
 675 }
 676
 677 static int palmas_gpadc_write_event_config(struct iio_dev *indio_dev,
 678                                            const struct iio_chan_spec *chan,
 679                                            enum iio_event_type type,
 680                                            enum iio_event_direction dir,
 681                                            int state)
 682 {
 683         struct palmas_gpadc *adc = iio_priv(indio_dev);
 684         int adc_chan = chan->channel;
 685         int ret;
 686
 687         if (adc_chan >= PALMAS_ADC_CH_MAX || type != IIO_EV_TYPE_THRESH)
 688                 return -EINVAL;
 689
 690         mutex_lock(&adc->lock);
 691
 692         if (state)
 693                 ret = palmas_gpadc_enable_event_config(adc, chan, dir);
 694         else
 695                 ret = palmas_gpadc_disable_event_config(adc, chan, dir);
 696
 697         mutex_unlock(&adc->lock);
 698
 699         return ret;
 700 }
 701
 702 static int palmas_gpadc_read_event_value(struct iio_dev *indio_dev,
 703                                          const struct iio_chan_spec *chan,
 704                                          enum iio_event_type type,
 705                                          enum iio_event_direction dir,
 706                                          enum iio_event_info info,
 707                                          int *val, int *val2)
 708 {
 709         struct palmas_gpadc *adc = iio_priv(indio_dev);
 710         int adc_chan = chan->channel;
 711         int ret;
 712
 713         if (adc_chan >= PALMAS_ADC_CH_MAX || type != IIO_EV_TYPE_THRESH)
 714                 return -EINVAL;
 715
 716         mutex_lock(&adc->lock);
 717
 718         switch (info) {
 719         case IIO_EV_INFO_VALUE:
 720                 *val = (dir == IIO_EV_DIR_RISING) ?
 721                         adc->thresholds[adc_chan].high :
 722                         adc->thresholds[adc_chan].low;
 723                 ret = IIO_VAL_INT;
 724                 break;
 725         default:
 726                 ret = -EINVAL;
 727                 break;
 728         }
 729
 730         mutex_unlock(&adc->lock);
 731
 732         return ret;
 733 }
 734
 735 static int palmas_gpadc_write_event_value(struct iio_dev *indio_dev,
 736                                           const struct iio_chan_spec *chan,
 737                                           enum iio_event_type type,
 738                                           enum iio_event_direction dir,
 739                                           enum iio_event_info info,
 740                                           int val, int val2)
 741 {
 742         struct palmas_gpadc *adc = iio_priv(indio_dev);
 743         int adc_chan = chan->channel;
 744         int old;
 745         int ret;
 746
 747         if (adc_chan >= PALMAS_ADC_CH_MAX || type != IIO_EV_TYPE_THRESH)
 748                 return -EINVAL;
 749
 750         mutex_lock(&adc->lock);
 751         switch (info) {
 752         case IIO_EV_INFO_VALUE:
 753                 if (val < 0 || val > 0xFFF) {
 754                         ret = -EINVAL;
 755                         goto out_unlock;
 756                 }
 757                 if (dir == IIO_EV_DIR_RISING) {
 758                         old = adc->thresholds[adc_chan].high;
 759                         adc->thresholds[adc_chan].high = val;
 760                 } else {
 761                         old = adc->thresholds[adc_chan].low;
 762                         adc->thresholds[adc_chan].low = val;
 763                 }
 764                 ret = 0;
 765                 break;
 766         default:
 767                 ret = -EINVAL;
 768                 goto out_unlock;
 769         }
 770
 771         if (val != old && palmas_gpadc_get_event(adc, adc_chan, dir))
 772                 ret = palmas_gpadc_reconfigure_event_channels(adc);
 773
 774 out_unlock:
 775         mutex_unlock(&adc->lock);
 776
 777         return ret;
 778 }
 779
 780 static const struct iio_info palmas_gpadc_iio_info = {
 781         .read_raw = palmas_gpadc_read_raw,
 782         .read_event_config = palmas_gpadc_read_event_config,
 783         .write_event_config = palmas_gpadc_write_event_config,
 784         .read_event_value = palmas_gpadc_read_event_value,
 785         .write_event_value = palmas_gpadc_write_event_value,
 786 };
 787
 788 static const struct iio_event_spec palmas_gpadc_events[] = {
 789         {
 790                 .type = IIO_EV_TYPE_THRESH,
 791                 .dir = IIO_EV_DIR_RISING,
 792                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 793                                 BIT(IIO_EV_INFO_ENABLE),
 794         }, {
 795                 .type = IIO_EV_TYPE_THRESH,
 796                 .dir = IIO_EV_DIR_FALLING,
 797                 .mask_separate = BIT(IIO_EV_INFO_VALUE) |
 798                                 BIT(IIO_EV_INFO_ENABLE),
 799         },
 800 };
 801
 802 #define PALMAS_ADC_CHAN_IIO(chan, _type, chan_info)     \
 803 {                                                       \
 804         .datasheet_name = PALMAS_DATASHEET_NAME(chan),  \
 805         .type = _type,                                  \
 806         .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |  \
 807                         BIT(chan_info),                 \
 808         .indexed = 1,                                   \
 809         .channel = PALMAS_ADC_CH_##chan,                \
 810         .event_spec = palmas_gpadc_events,              \
 811         .num_event_specs = ARRAY_SIZE(palmas_gpadc_events)      \
 812 }
 813
 814 static const struct iio_chan_spec palmas_gpadc_iio_channel[] = {
 815         PALMAS_ADC_CHAN_IIO(IN0, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 816         PALMAS_ADC_CHAN_IIO(IN1, IIO_TEMP, IIO_CHAN_INFO_RAW),
 817         PALMAS_ADC_CHAN_IIO(IN2, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 818         PALMAS_ADC_CHAN_IIO(IN3, IIO_TEMP, IIO_CHAN_INFO_RAW),
 819         PALMAS_ADC_CHAN_IIO(IN4, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 820         PALMAS_ADC_CHAN_IIO(IN5, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 821         PALMAS_ADC_CHAN_IIO(IN6, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 822         PALMAS_ADC_CHAN_IIO(IN7, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 823         PALMAS_ADC_CHAN_IIO(IN8, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 824         PALMAS_ADC_CHAN_IIO(IN9, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 825         PALMAS_ADC_CHAN_IIO(IN10, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 826         PALMAS_ADC_CHAN_IIO(IN11, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 827         PALMAS_ADC_CHAN_IIO(IN12, IIO_TEMP, IIO_CHAN_INFO_RAW),
 828         PALMAS_ADC_CHAN_IIO(IN13, IIO_TEMP, IIO_CHAN_INFO_RAW),
 829         PALMAS_ADC_CHAN_IIO(IN14, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 830         PALMAS_ADC_CHAN_IIO(IN15, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 831 };
 832
 833 static int palmas_gpadc_get_adc_dt_data(struct platform_device *pdev,
 834         struct palmas_gpadc_platform_data **gpadc_pdata)
 835 {
 836         struct device_node *np = pdev->dev.of_node;
 837         struct palmas_gpadc_platform_data *gp_data;
 838         int ret;
 839         u32 pval;
 840
 841         gp_data = devm_kzalloc(&pdev->dev, sizeof(*gp_data), GFP_KERNEL);
 842         if (!gp_data)
 843                 return -ENOMEM;
 844
 845         ret = of_property_read_u32(np, "ti,channel0-current-microamp", &pval);
 846         if (!ret)
 847                 gp_data->ch0_current = pval;
 848
 849         ret = of_property_read_u32(np, "ti,channel3-current-microamp", &pval);
 850         if (!ret)
 851                 gp_data->ch3_current = pval;
 852
 853         gp_data->extended_delay = of_property_read_bool(np,
 854                                         "ti,enable-extended-delay");
 855
 856         *gpadc_pdata = gp_data;
 857
 858         return 0;
 859 }
 860
 861 static void palmas_gpadc_reset(void *data)
 862 {
 863         struct palmas_gpadc *adc = data;
 864         if (adc->event0.enabled || adc->event1.enabled)
 865                 palmas_adc_reset_events(adc);
 866 }
 867
 868 static int palmas_gpadc_probe(struct platform_device *pdev)
 869 {
 870         struct palmas_gpadc *adc;
 871         struct palmas_platform_data *pdata;
 872         struct palmas_gpadc_platform_data *gpadc_pdata = NULL;
 873         struct iio_dev *indio_dev;
 874         int ret, i;
 875
 876         pdata = dev_get_platdata(pdev->dev.parent);
 877
 878         if (pdata && pdata->gpadc_pdata)
 879                 gpadc_pdata = pdata->gpadc_pdata;
 880
 881         if (!gpadc_pdata && pdev->dev.of_node) {
 882                 ret = palmas_gpadc_get_adc_dt_data(pdev, &gpadc_pdata);
 883                 if (ret < 0)
 884                         return ret;
 885         }
 886         if (!gpadc_pdata)
 887                 return -EINVAL;
 888
 889         indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*adc));
 890         if (!indio_dev) {
 891                 dev_err(&pdev->dev, "iio_device_alloc failed\n");
 892                 return -ENOMEM;
 893         }
 894
 895         adc = iio_priv(indio_dev);
 896         adc->dev = &pdev->dev;
 897         adc->palmas = dev_get_drvdata(pdev->dev.parent);
 898         adc->adc_info = palmas_gpadc_info;
 899
 900         mutex_init(&adc->lock);
 901
 902         init_completion(&adc->conv_completion);
 903         platform_set_drvdata(pdev, indio_dev);
 904
 905         adc->auto_conversion_period = gpadc_pdata->auto_conversion_period_ms;
 906         adc->irq = palmas_irq_get_virq(adc->palmas, PALMAS_GPADC_EOC_SW_IRQ);
 907         if (adc->irq < 0)
 908                 return dev_err_probe(adc->dev, adc->irq, "get virq failed\n");
 909
 910         ret = devm_request_threaded_irq(&pdev->dev, adc->irq, NULL,
 911                                         palmas_gpadc_irq,
 912                                         IRQF_ONESHOT, dev_name(adc->dev),
 913                                         adc);
 914         if (ret < 0)
 915                 return dev_err_probe(adc->dev, ret,
 916                                      "request irq %d failed\n", adc->irq);
 917
 918         adc->irq_auto_0 = platform_get_irq(pdev, 1);
 919         if (adc->irq_auto_0 < 0)
 920                 return dev_err_probe(adc->dev, adc->irq_auto_0,
 921                                      "get auto0 irq failed\n");
 922
 923         ret = devm_request_threaded_irq(&pdev->dev, adc->irq_auto_0, NULL,
 924                                         palmas_gpadc_irq_auto, IRQF_ONESHOT,
 925                                         "palmas-adc-auto-0", indio_dev);
 926         if (ret < 0)
 927                 return dev_err_probe(adc->dev, ret,
 928                                      "request auto0 irq %d failed\n",
 929                                      adc->irq_auto_0);
 930
 931         adc->irq_auto_1 = platform_get_irq(pdev, 2);
 932         if (adc->irq_auto_1 < 0)
 933                 return dev_err_probe(adc->dev, adc->irq_auto_1,
 934                                      "get auto1 irq failed\n");
 935
 936         ret = devm_request_threaded_irq(&pdev->dev, adc->irq_auto_1, NULL,
 937                                         palmas_gpadc_irq_auto, IRQF_ONESHOT,
 938                                         "palmas-adc-auto-1", indio_dev);
 939         if (ret < 0)
 940                 return dev_err_probe(adc->dev, ret,
 941                                      "request auto1 irq %d failed\n",
 942                                      adc->irq_auto_1);
 943
 944         adc->event0.enabled = false;
 945         adc->event0.channel = -1;
 946         adc->event0.direction = IIO_EV_DIR_NONE;
 947         adc->event1.enabled = false;
 948         adc->event1.channel = -1;
 949         adc->event1.direction = IIO_EV_DIR_NONE;
 950
 951         /* set the current source 0 (value 0/5/15/20 uA => 0..3) */
 952         if (gpadc_pdata->ch0_current <= 1)
 953                 adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_0;
 954         else if (gpadc_pdata->ch0_current <= 5)
 955                 adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_5;
 956         else if (gpadc_pdata->ch0_current <= 15)
 957                 adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_15;
 958         else
 959                 adc->ch0_current = PALMAS_ADC_CH0_CURRENT_SRC_20;
 960
 961         /* set the current source 3 (value 0/10/400/800 uA => 0..3) */
 962         if (gpadc_pdata->ch3_current <= 1)
 963                 adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_0;
 964         else if (gpadc_pdata->ch3_current <= 10)
 965                 adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_10;
 966         else if (gpadc_pdata->ch3_current <= 400)
 967                 adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_400;
 968         else
 969                 adc->ch3_current = PALMAS_ADC_CH3_CURRENT_SRC_800;
 970
 971         adc->extended_delay = gpadc_pdata->extended_delay;
 972
 973         indio_dev->name = MOD_NAME;
 974         indio_dev->info = &palmas_gpadc_iio_info;
 975         indio_dev->modes = INDIO_DIRECT_MODE;
 976         indio_dev->channels = palmas_gpadc_iio_channel;
 977         indio_dev->num_channels = ARRAY_SIZE(palmas_gpadc_iio_channel);
 978
 979         ret = devm_iio_device_register(&pdev->dev, indio_dev);
 980         if (ret < 0)
 981                 return dev_err_probe(adc->dev, ret,
 982                                      "iio_device_register() failed\n");
 983
 984         device_set_wakeup_capable(&pdev->dev, 1);
 985         for (i = 0; i < PALMAS_ADC_CH_MAX; i++) {
 986                 if (!(adc->adc_info[i].is_uncalibrated))
 987                         palmas_gpadc_calibrate(adc, i);
 988         }
 989
 990         ret = devm_add_action(&pdev->dev, palmas_gpadc_reset, adc);
 991         if (ret)
 992                 return ret;
 993
 994         return 0;
 995 }
 996
 997 static int palmas_adc_configure_events(struct palmas_gpadc *adc)
 998 {
 999         int adc_period, conv;
1000         int i;
1001         int ch0 = 0, ch1 = 0;
1002         int thres;
1003         int ret;
1004
1005         adc_period = adc->auto_conversion_period;
1006         for (i = 0; i < 16; ++i) {
1007                 if (((1000 * (1 << i)) / 32) >= adc_period)
1008                         break;
1009         }
1010         if (i > 0)
1011                 i--;
1012         adc_period = i;
1013         ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
1014                         PALMAS_GPADC_AUTO_CTRL,
1015                         PALMAS_GPADC_AUTO_CTRL_COUNTER_CONV_MASK,
1016                         adc_period);
1017         if (ret < 0) {
1018                 dev_err(adc->dev, "AUTO_CTRL write failed: %d\n", ret);
1019                 return ret;
1020         }
1021
1022         conv = 0;
1023         if (adc->event0.enabled) {
1024                 struct palmas_adc_event *ev = &adc->event0;
1025                 int polarity;
1026
1027                 ch0 = ev->channel;
1028                 conv |= PALMAS_GPADC_AUTO_CTRL_AUTO_CONV0_EN;
1029                 switch (ev->direction) {
1030                 case IIO_EV_DIR_RISING:
1031                         thres = palmas_gpadc_get_high_threshold_raw(adc, ev);
1032                         polarity = 0;
1033                         break;
1034                 case IIO_EV_DIR_FALLING:
1035                         thres = palmas_gpadc_get_low_threshold_raw(adc, ev);
1036                         polarity = PALMAS_GPADC_THRES_CONV0_MSB_THRES_CONV0_POL;
1037                         break;
1038                 default:
1039                         return -EINVAL;
1040                 }
1041
1042                 ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
1043                                 PALMAS_GPADC_THRES_CONV0_LSB, thres & 0xFF);
1044                 if (ret < 0) {
1045                         dev_err(adc->dev,
1046                                 "THRES_CONV0_LSB write failed: %d\n", ret);
1047                         return ret;
1048                 }
1049
1050                 ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
1051                                 PALMAS_GPADC_THRES_CONV0_MSB,
1052                                 ((thres >> 8) & 0xF) | polarity);
1053                 if (ret < 0) {
1054                         dev_err(adc->dev,
1055                                 "THRES_CONV0_MSB write failed: %d\n", ret);
1056                         return ret;
1057                 }
1058         }
1059
1060         if (adc->event1.enabled) {
1061                 struct palmas_adc_event *ev = &adc->event1;
1062                 int polarity;
1063
1064                 ch1 = ev->channel;
1065                 conv |= PALMAS_GPADC_AUTO_CTRL_AUTO_CONV1_EN;
1066                 switch (ev->direction) {
1067                 case IIO_EV_DIR_RISING:
1068                         thres = palmas_gpadc_get_high_threshold_raw(adc, ev);
1069                         polarity = 0;
1070                         break;
1071                 case IIO_EV_DIR_FALLING:
1072                         thres = palmas_gpadc_get_low_threshold_raw(adc, ev);
1073                         polarity = PALMAS_GPADC_THRES_CONV1_MSB_THRES_CONV1_POL;
1074                         break;
1075                 default:
1076                         return -EINVAL;
1077                 }
1078
1079                 ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
1080                                 PALMAS_GPADC_THRES_CONV1_LSB, thres & 0xFF);
1081                 if (ret < 0) {
1082                         dev_err(adc->dev,
1083                                 "THRES_CONV1_LSB write failed: %d\n", ret);
1084                         return ret;
1085                 }
1086
1087                 ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
1088                                 PALMAS_GPADC_THRES_CONV1_MSB,
1089                                 ((thres >> 8) & 0xF) | polarity);
1090                 if (ret < 0) {
1091                         dev_err(adc->dev,
1092                                 "THRES_CONV1_MSB write failed: %d\n", ret);
1093                         return ret;
1094                 }
1095         }
1096
1097         ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
1098                         PALMAS_GPADC_AUTO_SELECT, (ch1 << 4) | ch0);
1099         if (ret < 0) {
1100                 dev_err(adc->dev, "AUTO_SELECT write failed: %d\n", ret);
1101                 return ret;
1102         }
1103
1104         ret = palmas_update_bits(adc->palmas, PALMAS_GPADC_BASE,
1105                         PALMAS_GPADC_AUTO_CTRL,
1106                         PALMAS_GPADC_AUTO_CTRL_AUTO_CONV1_EN |
1107                         PALMAS_GPADC_AUTO_CTRL_AUTO_CONV0_EN, conv);
1108         if (ret < 0)
1109                 dev_err(adc->dev, "AUTO_CTRL write failed: %d\n", ret);
1110
1111         return ret;
1112 }
1113
1114 static int palmas_adc_reset_events(struct palmas_gpadc *adc)
1115 {
1116         int ret;
1117
1118         ret = palmas_write(adc->palmas, PALMAS_GPADC_BASE,
1119                         PALMAS_GPADC_AUTO_SELECT, 0);
1120         if (ret < 0) {
1121                 dev_err(adc->dev, "AUTO_SELECT write failed: %d\n", ret);
1122                 return ret;
1123         }
1124
1125         ret = palmas_disable_auto_conversion(adc);
1126         if (ret < 0)
1127                 dev_err(adc->dev, "Disable auto conversion failed: %d\n", ret);
1128
1129         return ret;
1130 }
1131
1132 static int palmas_gpadc_suspend(struct device *dev)
1133 {
1134         struct iio_dev *indio_dev = dev_get_drvdata(dev);
1135         struct palmas_gpadc *adc = iio_priv(indio_dev);
1136
1137         if (!device_may_wakeup(dev))
1138                 return 0;
1139
1140         if (adc->event0.enabled)
1141                 enable_irq_wake(adc->irq_auto_0);
1142
1143         if (adc->event1.enabled)
1144                 enable_irq_wake(adc->irq_auto_1);
1145
1146         return 0;
1147 }
1148
1149 static int palmas_gpadc_resume(struct device *dev)
1150 {
1151         struct iio_dev *indio_dev = dev_get_drvdata(dev);
1152         struct palmas_gpadc *adc = iio_priv(indio_dev);
1153
1154         if (!device_may_wakeup(dev))
1155                 return 0;
1156
1157         if (adc->event0.enabled)
1158                 disable_irq_wake(adc->irq_auto_0);
1159
1160         if (adc->event1.enabled)
1161                 disable_irq_wake(adc->irq_auto_1);
1162
1163         return 0;
1164 };
1165
1166 static DEFINE_SIMPLE_DEV_PM_OPS(palmas_pm_ops, palmas_gpadc_suspend,
1167                                 palmas_gpadc_resume);
1168
1169 static const struct of_device_id of_palmas_gpadc_match_tbl[] = {
1170         { .compatible = "ti,palmas-gpadc", },
1171         { /* end */ }
1172 };
1173 MODULE_DEVICE_TABLE(of, of_palmas_gpadc_match_tbl);
1174
1175 static struct platform_driver palmas_gpadc_driver = {
1176         .probe = palmas_gpadc_probe,
1177         .driver = {
1178                 .name = MOD_NAME,
1179                 .pm = pm_sleep_ptr(&palmas_pm_ops),
1180                 .of_match_table = of_palmas_gpadc_match_tbl,
1181         },
1182 };
1183 module_platform_driver(palmas_gpadc_driver);
1184
1185 MODULE_DESCRIPTION("palmas GPADC driver");
1186 MODULE_AUTHOR("Pradeep Goudagunta<pgoudagunta@nvidia.com>");
1187 MODULE_ALIAS("platform:palmas-gpadc");
1188 MODULE_LICENSE("GPL v2");