kernel/drivers/iio/adc/twl6030-gpadc.c

   1 /*
   2  * TWL6030 GPADC module driver
   3  *
   4  * Copyright (C) 2009-2013 Texas Instruments Inc.
   5  * Nishant Kamat <nskamat@ti.com>
   6  * Balaji T K <balajitk@ti.com>
   7  * Graeme Gregory <gg@slimlogic.co.uk>
   8  * Girish S Ghongdemath <girishsg@ti.com>
   9  * Ambresh K <ambresh@ti.com>
  10  * Oleksandr Kozaruk <oleksandr.kozaruk@ti.com
  11  *
  12  * Based on twl4030-madc.c
  13  * Copyright (C) 2008 Nokia Corporation
  14  * Mikko Ylinen <mikko.k.ylinen@nokia.com>
  15  *
  16  * This program is free software; you can redistribute it and/or
  17  * modify it under the terms of the GNU General Public License
  18  * version 2 as published by the Free Software Foundation.
  19  *
  20  * This program is distributed in the hope that it will be useful, but
  21  * WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  23  * General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  28  * 02110-1301 USA
  29  *
  30  */
  31 #include <linux/interrupt.h>
  32 #include <linux/kernel.h>
  33 #include <linux/module.h>
  34 #include <linux/platform_device.h>
  35 #include <linux/of_platform.h>
  36 #include <linux/i2c/twl.h>
  37 #include <linux/iio/iio.h>
  38 #include <linux/iio/sysfs.h>
  39
  40 #define DRIVER_NAME             "twl6030_gpadc"
  41
  42 /*
  43  * twl6030 per TRM has 17 channels, and twl6032 has 19 channels
  44  * 2 test network channels are not used,
  45  * 2 die temperature channels are not used either, as it is not
  46  * defined how to convert ADC value to temperature
  47  */
  48 #define TWL6030_GPADC_USED_CHANNELS             13
  49 #define TWL6030_GPADC_MAX_CHANNELS              15
  50 #define TWL6032_GPADC_USED_CHANNELS             15
  51 #define TWL6032_GPADC_MAX_CHANNELS              19
  52 #define TWL6030_GPADC_NUM_TRIM_REGS             16
  53
  54 #define TWL6030_GPADC_CTRL_P1                   0x05
  55
  56 #define TWL6032_GPADC_GPSELECT_ISB              0x07
  57 #define TWL6032_GPADC_CTRL_P1                   0x08
  58
  59 #define TWL6032_GPADC_GPCH0_LSB                 0x0d
  60 #define TWL6032_GPADC_GPCH0_MSB                 0x0e
  61
  62 #define TWL6030_GPADC_CTRL_P1_SP1               BIT(3)
  63
  64 #define TWL6030_GPADC_GPCH0_LSB                 (0x29)
  65
  66 #define TWL6030_GPADC_RT_SW1_EOC_MASK           BIT(5)
  67
  68 #define TWL6030_GPADC_TRIM1                     0xCD
  69
  70 #define TWL6030_REG_TOGGLE1                     0x90
  71 #define TWL6030_GPADCS                          BIT(1)
  72 #define TWL6030_GPADCR                          BIT(0)
  73
  74 /**
  75  * struct twl6030_chnl_calib - channel calibration
  76  * @gain:               slope coefficient for ideal curve
  77  * @gain_error:         gain error
  78  * @offset_error:       offset of the real curve
  79  */
  80 struct twl6030_chnl_calib {
  81         s32 gain;
  82         s32 gain_error;
  83         s32 offset_error;
  84 };
  85
  86 /**
  87  * struct twl6030_ideal_code - GPADC calibration parameters
  88  * GPADC is calibrated in two points: close to the beginning and
  89  * to the and of the measurable input range
  90  *
  91  * @channel:    channel number
  92  * @code1:      ideal code for the input at the beginning
  93  * @code2:      ideal code for at the end of the range
  94  * @volt1:      voltage input at the beginning(low voltage)
  95  * @volt2:      voltage input at the end(high voltage)
  96  */
  97 struct twl6030_ideal_code {
  98         int channel;
  99         u16 code1;
 100         u16 code2;
 101         u16 volt1;
 102         u16 volt2;
 103 };
 104
 105 struct twl6030_gpadc_data;
 106
 107 /**
 108  * struct twl6030_gpadc_platform_data - platform specific data
 109  * @nchannels:          number of GPADC channels
 110  * @iio_channels:       iio channels
 111  * @twl6030_ideal:      pointer to calibration parameters
 112  * @start_conversion:   pointer to ADC start conversion function
 113  * @channel_to_reg      pointer to ADC function to convert channel to
 114  *                      register address for reading conversion result
 115  * @calibrate:          pointer to calibration function
 116  */
 117 struct twl6030_gpadc_platform_data {
 118         const int nchannels;
 119         const struct iio_chan_spec *iio_channels;
 120         const struct twl6030_ideal_code *ideal;
 121         int (*start_conversion)(int channel);
 122         u8 (*channel_to_reg)(int channel);
 123         int (*calibrate)(struct twl6030_gpadc_data *gpadc);
 124 };
 125
 126 /**
 127  * struct twl6030_gpadc_data - GPADC data
 128  * @dev:                device pointer
 129  * @lock:               mutual exclusion lock for the structure
 130  * @irq_complete:       completion to signal end of conversion
 131  * @twl6030_cal_tbl:    pointer to calibration data for each
 132  *                      channel with gain error and offset
 133  * @pdata:              pointer to device specific data
 134  */
 135 struct twl6030_gpadc_data {
 136         struct device   *dev;
 137         struct mutex    lock;
 138         struct completion       irq_complete;
 139         struct twl6030_chnl_calib       *twl6030_cal_tbl;
 140         const struct twl6030_gpadc_platform_data *pdata;
 141 };
 142
 143 /*
 144  * channels 11, 12, 13, 15 and 16 have no calibration data
 145  * calibration offset is same for channels 1, 3, 4, 5
 146  *
 147  * The data is taken from GPADC_TRIM registers description.
 148  * GPADC_TRIM registers keep difference between the code measured
 149  * at volt1 and volt2 input voltages and corresponding code1 and code2
 150  */
 151 static const struct twl6030_ideal_code
 152         twl6030_ideal[TWL6030_GPADC_USED_CHANNELS] = {
 153         [0] = { /* ch 0, external, battery type, resistor value */
 154                 .channel = 0,
 155                 .code1 = 116,
 156                 .code2 = 745,
 157                 .volt1 = 141,
 158                 .volt2 = 910,
 159         },
 160         [1] = { /* ch 1, external, battery temperature, NTC resistor value */
 161                 .channel = 1,
 162                 .code1 = 82,
 163                 .code2 = 900,
 164                 .volt1 = 100,
 165                 .volt2 = 1100,
 166         },
 167         [2] = { /* ch 2, external, audio accessory/general purpose */
 168                 .channel = 2,
 169                 .code1 = 55,
 170                 .code2 = 818,
 171                 .volt1 = 101,
 172                 .volt2 = 1499,
 173         },
 174         [3] = { /* ch 3, external, general purpose */
 175                 .channel = 3,
 176                 .code1 = 82,
 177                 .code2 = 900,
 178                 .volt1 = 100,
 179                 .volt2 = 1100,
 180         },
 181         [4] = { /* ch 4, external, temperature measurement/general purpose */
 182                 .channel = 4,
 183                 .code1 = 82,
 184                 .code2 = 900,
 185                 .volt1 = 100,
 186                 .volt2 = 1100,
 187         },
 188         [5] = { /* ch 5, external, general purpose */
 189                 .channel = 5,
 190                 .code1 = 82,
 191                 .code2 = 900,
 192                 .volt1 = 100,
 193                 .volt2 = 1100,
 194         },
 195         [6] = { /* ch 6, external, general purpose */
 196                 .channel = 6,
 197                 .code1 = 82,
 198                 .code2 = 900,
 199                 .volt1 = 100,
 200                 .volt2 = 1100,
 201         },
 202         [7] = { /* ch 7, internal, main battery */
 203                 .channel = 7,
 204                 .code1 = 614,
 205                 .code2 = 941,
 206                 .volt1 = 3001,
 207                 .volt2 = 4599,
 208         },
 209         [8] = { /* ch 8, internal, backup battery */
 210                 .channel = 8,
 211                 .code1 = 82,
 212                 .code2 = 688,
 213                 .volt1 = 501,
 214                 .volt2 = 4203,
 215         },
 216         [9] = { /* ch 9, internal, external charger input */
 217                 .channel = 9,
 218                 .code1 = 182,
 219                 .code2 = 818,
 220                 .volt1 = 2001,
 221                 .volt2 = 8996,
 222         },
 223         [10] = { /* ch 10, internal, VBUS */
 224                 .channel = 10,
 225                 .code1 = 149,
 226                 .code2 = 818,
 227                 .volt1 = 1001,
 228                 .volt2 = 5497,
 229         },
 230         [11] = { /* ch 11, internal, VBUS charging current */
 231                 .channel = 11,
 232         },
 233                 /* ch 12, internal, Die temperature */
 234                 /* ch 13, internal, Die temperature */
 235         [12] = { /* ch 14, internal, USB ID line */
 236                 .channel = 14,
 237                 .code1 = 48,
 238                 .code2 = 714,
 239                 .volt1 = 323,
 240                 .volt2 = 4800,
 241         },
 242 };
 243
 244 static const struct twl6030_ideal_code
 245                         twl6032_ideal[TWL6032_GPADC_USED_CHANNELS] = {
 246         [0] = { /* ch 0, external, battery type, resistor value */
 247                 .channel = 0,
 248                 .code1 = 1441,
 249                 .code2 = 3276,
 250                 .volt1 = 440,
 251                 .volt2 = 1000,
 252         },
 253         [1] = { /* ch 1, external, battery temperature, NTC resistor value */
 254                 .channel = 1,
 255                 .code1 = 1441,
 256                 .code2 = 3276,
 257                 .volt1 = 440,
 258                 .volt2 = 1000,
 259         },
 260         [2] = { /* ch 2, external, audio accessory/general purpose */
 261                 .channel = 2,
 262                 .code1 = 1441,
 263                 .code2 = 3276,
 264                 .volt1 = 660,
 265                 .volt2 = 1500,
 266         },
 267         [3] = { /* ch 3, external, temperature with external diode/general
 268                                                                 purpose */
 269                 .channel = 3,
 270                 .code1 = 1441,
 271                 .code2 = 3276,
 272                 .volt1 = 440,
 273                 .volt2 = 1000,
 274         },
 275         [4] = { /* ch 4, external, temperature measurement/general purpose */
 276                 .channel = 4,
 277                 .code1 = 1441,
 278                 .code2 = 3276,
 279                 .volt1 = 440,
 280                 .volt2 = 1000,
 281         },
 282         [5] = { /* ch 5, external, general purpose */
 283                 .channel = 5,
 284                 .code1 = 1441,
 285                 .code2 = 3276,
 286                 .volt1 = 440,
 287                 .volt2 = 1000,
 288         },
 289         [6] = { /* ch 6, external, general purpose */
 290                 .channel = 6,
 291                 .code1 = 1441,
 292                 .code2 = 3276,
 293                 .volt1 = 440,
 294                 .volt2 = 1000,
 295         },
 296         [7] = { /* ch7, internal, system supply */
 297                 .channel = 7,
 298                 .code1 = 1441,
 299                 .code2 = 3276,
 300                 .volt1 = 2200,
 301                 .volt2 = 5000,
 302         },
 303         [8] = { /* ch8, internal, backup battery */
 304                 .channel = 8,
 305                 .code1 = 1441,
 306                 .code2 = 3276,
 307                 .volt1 = 2200,
 308                 .volt2 = 5000,
 309         },
 310         [9] = { /* ch 9, internal, external charger input */
 311                 .channel = 9,
 312                 .code1 = 1441,
 313                 .code2 = 3276,
 314                 .volt1 = 3960,
 315                 .volt2 = 9000,
 316         },
 317         [10] = { /* ch10, internal, VBUS */
 318                 .channel = 10,
 319                 .code1 = 150,
 320                 .code2 = 751,
 321                 .volt1 = 1000,
 322                 .volt2 = 5000,
 323         },
 324         [11] = { /* ch 11, internal, VBUS DC-DC output current */
 325                 .channel = 11,
 326                 .code1 = 1441,
 327                 .code2 = 3276,
 328                 .volt1 = 660,
 329                 .volt2 = 1500,
 330         },
 331                 /* ch 12, internal, Die temperature */
 332                 /* ch 13, internal, Die temperature */
 333         [12] = { /* ch 14, internal, USB ID line */
 334                 .channel = 14,
 335                 .code1 = 1441,
 336                 .code2 = 3276,
 337                 .volt1 = 2420,
 338                 .volt2 = 5500,
 339         },
 340                 /* ch 15, internal, test network */
 341                 /* ch 16, internal, test network */
 342         [13] = { /* ch 17, internal, battery charging current */
 343                 .channel = 17,
 344         },
 345         [14] = { /* ch 18, internal, battery voltage */
 346                 .channel = 18,
 347                 .code1 = 1441,
 348                 .code2 = 3276,
 349                 .volt1 = 2200,
 350                 .volt2 = 5000,
 351         },
 352 };
 353
 354 static inline int twl6030_gpadc_write(u8 reg, u8 val)
 355 {
 356         return twl_i2c_write_u8(TWL6030_MODULE_GPADC, val, reg);
 357 }
 358
 359 static inline int twl6030_gpadc_read(u8 reg, u8 *val)
 360 {
 361
 362         return twl_i2c_read(TWL6030_MODULE_GPADC, val, reg, 2);
 363 }
 364
 365 static int twl6030_gpadc_enable_irq(u8 mask)
 366 {
 367         int ret;
 368
 369         ret = twl6030_interrupt_unmask(mask, REG_INT_MSK_LINE_B);
 370         if (ret < 0)
 371                 return ret;
 372
 373         ret = twl6030_interrupt_unmask(mask, REG_INT_MSK_STS_B);
 374
 375         return ret;
 376 }
 377
 378 static void twl6030_gpadc_disable_irq(u8 mask)
 379 {
 380         twl6030_interrupt_mask(mask, REG_INT_MSK_LINE_B);
 381         twl6030_interrupt_mask(mask, REG_INT_MSK_STS_B);
 382 }
 383
 384 static irqreturn_t twl6030_gpadc_irq_handler(int irq, void *indio_dev)
 385 {
 386         struct twl6030_gpadc_data *gpadc = iio_priv(indio_dev);
 387
 388         complete(&gpadc->irq_complete);
 389
 390         return IRQ_HANDLED;
 391 }
 392
 393 static int twl6030_start_conversion(int channel)
 394 {
 395         return twl6030_gpadc_write(TWL6030_GPADC_CTRL_P1,
 396                                         TWL6030_GPADC_CTRL_P1_SP1);
 397 }
 398
 399 static int twl6032_start_conversion(int channel)
 400 {
 401         int ret;
 402
 403         ret = twl6030_gpadc_write(TWL6032_GPADC_GPSELECT_ISB, channel);
 404         if (ret)
 405                 return ret;
 406
 407         return twl6030_gpadc_write(TWL6032_GPADC_CTRL_P1,
 408                                                 TWL6030_GPADC_CTRL_P1_SP1);
 409 }
 410
 411 static u8 twl6030_channel_to_reg(int channel)
 412 {
 413         return TWL6030_GPADC_GPCH0_LSB + 2 * channel;
 414 }
 415
 416 static u8 twl6032_channel_to_reg(int channel)
 417 {
 418         /*
 419          * for any prior chosen channel, when the conversion is ready
 420          * the result is avalable in GPCH0_LSB, GPCH0_MSB.
 421          */
 422
 423         return TWL6032_GPADC_GPCH0_LSB;
 424 }
 425
 426 static int twl6030_gpadc_lookup(const struct twl6030_ideal_code *ideal,
 427                 int channel, int size)
 428 {
 429         int i;
 430
 431         for (i = 0; i < size; i++)
 432                 if (ideal[i].channel == channel)
 433                         break;
 434
 435         return i;
 436 }
 437
 438 static int twl6030_channel_calibrated(const struct twl6030_gpadc_platform_data
 439                 *pdata, int channel)
 440 {
 441         const struct twl6030_ideal_code *ideal = pdata->ideal;
 442         int i;
 443
 444         i = twl6030_gpadc_lookup(ideal, channel, pdata->nchannels);
 445         /* not calibrated channels have 0 in all structure members */
 446         return pdata->ideal[i].code2;
 447 }
 448
 449 static int twl6030_gpadc_make_correction(struct twl6030_gpadc_data *gpadc,
 450                 int channel, int raw_code)
 451 {
 452         const struct twl6030_ideal_code *ideal = gpadc->pdata->ideal;
 453         int corrected_code;
 454         int i;
 455
 456         i = twl6030_gpadc_lookup(ideal, channel, gpadc->pdata->nchannels);
 457         corrected_code = ((raw_code * 1000) -
 458                 gpadc->twl6030_cal_tbl[i].offset_error) /
 459                 gpadc->twl6030_cal_tbl[i].gain_error;
 460
 461         return corrected_code;
 462 }
 463
 464 static int twl6030_gpadc_get_raw(struct twl6030_gpadc_data *gpadc,
 465                 int channel, int *res)
 466 {
 467         u8 reg = gpadc->pdata->channel_to_reg(channel);
 468         __le16 val;
 469         int raw_code;
 470         int ret;
 471
 472         ret = twl6030_gpadc_read(reg, (u8 *)&val);
 473         if (ret) {
 474                 dev_dbg(gpadc->dev, "unable to read register 0x%X\n", reg);
 475                 return ret;
 476         }
 477
 478         raw_code = le16_to_cpu(val);
 479         dev_dbg(gpadc->dev, "GPADC raw code: %d", raw_code);
 480
 481         if (twl6030_channel_calibrated(gpadc->pdata, channel))
 482                 *res = twl6030_gpadc_make_correction(gpadc, channel, raw_code);
 483         else
 484                 *res = raw_code;
 485
 486         return ret;
 487 }
 488
 489 static int twl6030_gpadc_get_processed(struct twl6030_gpadc_data *gpadc,
 490                 int channel, int *val)
 491 {
 492         const struct twl6030_ideal_code *ideal = gpadc->pdata->ideal;
 493         int corrected_code;
 494         int channel_value;
 495         int i;
 496         int ret;
 497
 498         ret = twl6030_gpadc_get_raw(gpadc, channel, &corrected_code);
 499         if (ret)
 500                 return ret;
 501
 502         i = twl6030_gpadc_lookup(ideal, channel, gpadc->pdata->nchannels);
 503         channel_value = corrected_code *
 504                         gpadc->twl6030_cal_tbl[i].gain;
 505
 506         /* Shift back into mV range */
 507         channel_value /= 1000;
 508
 509         dev_dbg(gpadc->dev, "GPADC corrected code: %d", corrected_code);
 510         dev_dbg(gpadc->dev, "GPADC value: %d", channel_value);
 511
 512         *val = channel_value;
 513
 514         return ret;
 515 }
 516
 517 static int twl6030_gpadc_read_raw(struct iio_dev *indio_dev,
 518                              const struct iio_chan_spec *chan,
 519                              int *val, int *val2, long mask)
 520 {
 521         struct twl6030_gpadc_data *gpadc = iio_priv(indio_dev);
 522         int ret;
 523         long timeout;
 524
 525         mutex_lock(&gpadc->lock);
 526
 527         ret = gpadc->pdata->start_conversion(chan->channel);
 528         if (ret) {
 529                 dev_err(gpadc->dev, "failed to start conversion\n");
 530                 goto err;
 531         }
 532         /* wait for conversion to complete */
 533         timeout = wait_for_completion_interruptible_timeout(
 534                                 &gpadc->irq_complete, msecs_to_jiffies(5000));
 535         if (timeout == 0) {
 536                 ret = -ETIMEDOUT;
 537                 goto err;
 538         } else if (timeout < 0) {
 539                 ret = -EINTR;
 540                 goto err;
 541         }
 542
 543         switch (mask) {
 544         case IIO_CHAN_INFO_RAW:
 545                 ret = twl6030_gpadc_get_raw(gpadc, chan->channel, val);
 546                 ret = ret ? -EIO : IIO_VAL_INT;
 547                 break;
 548
 549         case IIO_CHAN_INFO_PROCESSED:
 550                 ret = twl6030_gpadc_get_processed(gpadc, chan->channel, val);
 551                 ret = ret ? -EIO : IIO_VAL_INT;
 552                 break;
 553
 554         default:
 555                 break;
 556         }
 557 err:
 558         mutex_unlock(&gpadc->lock);
 559
 560         return ret;
 561 }
 562
 563 /*
 564  * The GPADC channels are calibrated using a two point calibration method.
 565  * The channels measured with two known values: volt1 and volt2, and
 566  * ideal corresponding output codes are known: code1, code2.
 567  * The difference(d1, d2) between ideal and measured codes stored in trim
 568  * registers.
 569  * The goal is to find offset and gain of the real curve for each calibrated
 570  * channel.
 571  * gain: k = 1 + ((d2 - d1) / (x2 - x1))
 572  * offset: b = d1 + (k - 1) * x1
 573  */
 574 static void twl6030_calibrate_channel(struct twl6030_gpadc_data *gpadc,
 575                 int channel, int d1, int d2)
 576 {
 577         int b, k, gain, x1, x2, i;
 578         const struct twl6030_ideal_code *ideal = gpadc->pdata->ideal;
 579
 580         i = twl6030_gpadc_lookup(ideal, channel, gpadc->pdata->nchannels);
 581
 582         /* Gain */
 583         gain = ((ideal[i].volt2 - ideal[i].volt1) * 1000) /
 584                 (ideal[i].code2 - ideal[i].code1);
 585
 586         x1 = ideal[i].code1;
 587         x2 = ideal[i].code2;
 588
 589         /* k - real curve gain */
 590         k = 1000 + (((d2 - d1) * 1000) / (x2 - x1));
 591
 592         /* b - offset of the real curve gain */
 593         b = (d1 * 1000) - (k - 1000) * x1;
 594
 595         gpadc->twl6030_cal_tbl[i].gain = gain;
 596         gpadc->twl6030_cal_tbl[i].gain_error = k;
 597         gpadc->twl6030_cal_tbl[i].offset_error = b;
 598
 599         dev_dbg(gpadc->dev, "GPADC d1   for Chn: %d = %d\n", channel, d1);
 600         dev_dbg(gpadc->dev, "GPADC d2   for Chn: %d = %d\n", channel, d2);
 601         dev_dbg(gpadc->dev, "GPADC x1   for Chn: %d = %d\n", channel, x1);
 602         dev_dbg(gpadc->dev, "GPADC x2   for Chn: %d = %d\n", channel, x2);
 603         dev_dbg(gpadc->dev, "GPADC Gain for Chn: %d = %d\n", channel, gain);
 604         dev_dbg(gpadc->dev, "GPADC k    for Chn: %d = %d\n", channel, k);
 605         dev_dbg(gpadc->dev, "GPADC b    for Chn: %d = %d\n", channel, b);
 606 }
 607
 608 static inline int twl6030_gpadc_get_trim_offset(s8 d)
 609 {
 610         /*
 611          * XXX NOTE!
 612          * bit 0 - sign, bit 7 - reserved, 6..1 - trim value
 613          * though, the documentation states that trim value
 614          * is absolute value, the correct conversion results are
 615          * obtained if the value is interpreted as 2's complement.
 616          */
 617         __u32 temp = ((d & 0x7f) >> 1) | ((d & 1) << 6);
 618
 619         return sign_extend32(temp, 6);
 620 }
 621
 622 static int twl6030_calibration(struct twl6030_gpadc_data *gpadc)
 623 {
 624         int ret;
 625         int chn;
 626         u8 trim_regs[TWL6030_GPADC_NUM_TRIM_REGS];
 627         s8 d1, d2;
 628
 629         /*
 630          * for calibration two measurements have been performed at
 631          * factory, for some channels, during the production test and
 632          * have been stored in registers. This two stored values are
 633          * used to correct the measurements. The values represent
 634          * offsets for the given input from the output on ideal curve.
 635          */
 636         ret = twl_i2c_read(TWL6030_MODULE_ID2, trim_regs,
 637                         TWL6030_GPADC_TRIM1, TWL6030_GPADC_NUM_TRIM_REGS);
 638         if (ret < 0) {
 639                 dev_err(gpadc->dev, "calibration failed\n");
 640                 return ret;
 641         }
 642
 643         for (chn = 0; chn < TWL6030_GPADC_MAX_CHANNELS; chn++) {
 644
 645                 switch (chn) {
 646                 case 0:
 647                         d1 = trim_regs[0];
 648                         d2 = trim_regs[1];
 649                         break;
 650                 case 1:
 651                 case 3:
 652                 case 4:
 653                 case 5:
 654                 case 6:
 655                         d1 = trim_regs[4];
 656                         d2 = trim_regs[5];
 657                         break;
 658                 case 2:
 659                         d1 = trim_regs[12];
 660                         d2 = trim_regs[13];
 661                         break;
 662                 case 7:
 663                         d1 = trim_regs[6];
 664                         d2 = trim_regs[7];
 665                         break;
 666                 case 8:
 667                         d1 = trim_regs[2];
 668                         d2 = trim_regs[3];
 669                         break;
 670                 case 9:
 671                         d1 = trim_regs[8];
 672                         d2 = trim_regs[9];
 673                         break;
 674                 case 10:
 675                         d1 = trim_regs[10];
 676                         d2 = trim_regs[11];
 677                         break;
 678                 case 14:
 679                         d1 = trim_regs[14];
 680                         d2 = trim_regs[15];
 681                         break;
 682                 default:
 683                         continue;
 684                 }
 685
 686                 d1 = twl6030_gpadc_get_trim_offset(d1);
 687                 d2 = twl6030_gpadc_get_trim_offset(d2);
 688
 689                 twl6030_calibrate_channel(gpadc, chn, d1, d2);
 690         }
 691
 692         return 0;
 693 }
 694
 695 static int twl6032_get_trim_value(u8 *trim_regs, unsigned int reg0,
 696                 unsigned int reg1, unsigned int mask0, unsigned int mask1,
 697                 unsigned int shift0)
 698 {
 699         int val;
 700
 701         val = (trim_regs[reg0] & mask0) << shift0;
 702         val |= (trim_regs[reg1] & mask1) >> 1;
 703         if (trim_regs[reg1] & 0x01)
 704                 val = -val;
 705
 706         return val;
 707 }
 708
 709 static int twl6032_calibration(struct twl6030_gpadc_data *gpadc)
 710 {
 711         int chn, d1 = 0, d2 = 0, temp;
 712         u8 trim_regs[TWL6030_GPADC_NUM_TRIM_REGS];
 713         int ret;
 714
 715         ret = twl_i2c_read(TWL6030_MODULE_ID2, trim_regs,
 716                         TWL6030_GPADC_TRIM1, TWL6030_GPADC_NUM_TRIM_REGS);
 717         if (ret < 0) {
 718                 dev_err(gpadc->dev, "calibration failed\n");
 719                 return ret;
 720         }
 721
 722         /*
 723          * Loop to calculate the value needed for returning voltages from
 724          * GPADC not values.
 725          *
 726          * gain is calculated to 3 decimal places fixed point.
 727          */
 728         for (chn = 0; chn < TWL6032_GPADC_MAX_CHANNELS; chn++) {
 729
 730                 switch (chn) {
 731                 case 0:
 732                 case 1:
 733                 case 2:
 734                 case 3:
 735                 case 4:
 736                 case 5:
 737                 case 6:
 738                 case 11:
 739                 case 14:
 740                         d1 = twl6032_get_trim_value(trim_regs, 2, 0, 0x1f,
 741                                                                 0x06, 2);
 742                         d2 = twl6032_get_trim_value(trim_regs, 3, 1, 0x3f,
 743                                                                 0x06, 2);
 744                         break;
 745                 case 8:
 746                         temp = twl6032_get_trim_value(trim_regs, 2, 0, 0x1f,
 747                                                                 0x06, 2);
 748                         d1 = temp + twl6032_get_trim_value(trim_regs, 7, 6,
 749                                                                 0x18, 0x1E, 1);
 750
 751                         temp = twl6032_get_trim_value(trim_regs, 3, 1, 0x3F,
 752                                                                 0x06, 2);
 753                         d2 = temp + twl6032_get_trim_value(trim_regs, 9, 7,
 754                                                                 0x1F, 0x06, 2);
 755                         break;
 756                 case 9:
 757                         temp = twl6032_get_trim_value(trim_regs, 2, 0, 0x1f,
 758                                                                 0x06, 2);
 759                         d1 = temp + twl6032_get_trim_value(trim_regs, 13, 11,
 760                                                                 0x18, 0x1E, 1);
 761
 762                         temp = twl6032_get_trim_value(trim_regs, 3, 1, 0x3f,
 763                                                                 0x06, 2);
 764                         d2 = temp + twl6032_get_trim_value(trim_regs, 15, 13,
 765                                                                 0x1F, 0x06, 1);
 766                         break;
 767                 case 10:
 768                         d1 = twl6032_get_trim_value(trim_regs, 10, 8, 0x0f,
 769                                                                 0x0E, 3);
 770                         d2 = twl6032_get_trim_value(trim_regs, 14, 12, 0x0f,
 771                                                                 0x0E, 3);
 772                         break;
 773                 case 7:
 774                 case 18:
 775                         temp = twl6032_get_trim_value(trim_regs, 2, 0, 0x1f,
 776                                                                 0x06, 2);
 777
 778                         d1 = (trim_regs[4] & 0x7E) >> 1;
 779                         if (trim_regs[4] & 0x01)
 780                                 d1 = -d1;
 781                         d1 += temp;
 782
 783                         temp = twl6032_get_trim_value(trim_regs, 3, 1, 0x3f,
 784                                                                 0x06, 2);
 785
 786                         d2 = (trim_regs[5] & 0xFE) >> 1;
 787                         if (trim_regs[5] & 0x01)
 788                                 d2 = -d2;
 789
 790                         d2 += temp;
 791                         break;
 792                 default:
 793                         /* No data for other channels */
 794                         continue;
 795                 }
 796
 797                 twl6030_calibrate_channel(gpadc, chn, d1, d2);
 798         }
 799
 800         return 0;
 801 }
 802
 803 #define TWL6030_GPADC_CHAN(chn, _type, chan_info) {     \
 804         .type = _type,                                  \
 805         .channel = chn,                                 \
 806         .info_mask_separate = BIT(chan_info),           \
 807         .indexed = 1,                                   \
 808 }
 809
 810 static const struct iio_chan_spec twl6030_gpadc_iio_channels[] = {
 811         TWL6030_GPADC_CHAN(0, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 812         TWL6030_GPADC_CHAN(1, IIO_TEMP, IIO_CHAN_INFO_RAW),
 813         TWL6030_GPADC_CHAN(2, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 814         TWL6030_GPADC_CHAN(3, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 815         TWL6030_GPADC_CHAN(4, IIO_TEMP, IIO_CHAN_INFO_RAW),
 816         TWL6030_GPADC_CHAN(5, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 817         TWL6030_GPADC_CHAN(6, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 818         TWL6030_GPADC_CHAN(7, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 819         TWL6030_GPADC_CHAN(8, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 820         TWL6030_GPADC_CHAN(9, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 821         TWL6030_GPADC_CHAN(10, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 822         TWL6030_GPADC_CHAN(11, IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
 823         TWL6030_GPADC_CHAN(14, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 824 };
 825
 826 static const struct iio_chan_spec twl6032_gpadc_iio_channels[] = {
 827         TWL6030_GPADC_CHAN(0, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 828         TWL6030_GPADC_CHAN(1, IIO_TEMP, IIO_CHAN_INFO_RAW),
 829         TWL6030_GPADC_CHAN(2, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 830         TWL6030_GPADC_CHAN(3, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 831         TWL6030_GPADC_CHAN(4, IIO_TEMP, IIO_CHAN_INFO_RAW),
 832         TWL6030_GPADC_CHAN(5, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 833         TWL6030_GPADC_CHAN(6, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 834         TWL6030_GPADC_CHAN(7, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 835         TWL6030_GPADC_CHAN(8, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 836         TWL6030_GPADC_CHAN(9, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 837         TWL6030_GPADC_CHAN(10, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 838         TWL6030_GPADC_CHAN(11, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 839         TWL6030_GPADC_CHAN(14, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 840         TWL6030_GPADC_CHAN(17, IIO_VOLTAGE, IIO_CHAN_INFO_RAW),
 841         TWL6030_GPADC_CHAN(18, IIO_VOLTAGE, IIO_CHAN_INFO_PROCESSED),
 842 };
 843
 844 static const struct iio_info twl6030_gpadc_iio_info = {
 845         .read_raw = &twl6030_gpadc_read_raw,
 846         .driver_module = THIS_MODULE,
 847 };
 848
 849 static const struct twl6030_gpadc_platform_data twl6030_pdata = {
 850         .iio_channels = twl6030_gpadc_iio_channels,
 851         .nchannels = TWL6030_GPADC_USED_CHANNELS,
 852         .ideal = twl6030_ideal,
 853         .start_conversion = twl6030_start_conversion,
 854         .channel_to_reg = twl6030_channel_to_reg,
 855         .calibrate = twl6030_calibration,
 856 };
 857
 858 static const struct twl6030_gpadc_platform_data twl6032_pdata = {
 859         .iio_channels = twl6032_gpadc_iio_channels,
 860         .nchannels = TWL6032_GPADC_USED_CHANNELS,
 861         .ideal = twl6032_ideal,
 862         .start_conversion = twl6032_start_conversion,
 863         .channel_to_reg = twl6032_channel_to_reg,
 864         .calibrate = twl6032_calibration,
 865 };
 866
 867 static const struct of_device_id of_twl6030_match_tbl[] = {
 868         {
 869                 .compatible = "ti,twl6030-gpadc",
 870                 .data = &twl6030_pdata,
 871         },
 872         {
 873                 .compatible = "ti,twl6032-gpadc",
 874                 .data = &twl6032_pdata,
 875         },
 876         { /* end */ }
 877 };
 878
 879 static int twl6030_gpadc_probe(struct platform_device *pdev)
 880 {
 881         struct device *dev = &pdev->dev;
 882         struct twl6030_gpadc_data *gpadc;
 883         const struct twl6030_gpadc_platform_data *pdata;
 884         const struct of_device_id *match;
 885         struct iio_dev *indio_dev;
 886         int irq;
 887         int ret;
 888
 889         match = of_match_device(of_twl6030_match_tbl, dev);
 890         if (!match)
 891                 return -EINVAL;
 892
 893         pdata = match->data;
 894
 895         indio_dev = devm_iio_device_alloc(dev, sizeof(*gpadc));
 896         if (!indio_dev)
 897                 return -ENOMEM;
 898
 899         gpadc = iio_priv(indio_dev);
 900
 901         gpadc->twl6030_cal_tbl = devm_kzalloc(dev,
 902                                         sizeof(*gpadc->twl6030_cal_tbl) *
 903                                         pdata->nchannels, GFP_KERNEL);
 904         if (!gpadc->twl6030_cal_tbl)
 905                 return -ENOMEM;
 906
 907         gpadc->dev = dev;
 908         gpadc->pdata = pdata;
 909
 910         platform_set_drvdata(pdev, indio_dev);
 911         mutex_init(&gpadc->lock);
 912         init_completion(&gpadc->irq_complete);
 913
 914         ret = pdata->calibrate(gpadc);
 915         if (ret < 0) {
 916                 dev_err(&pdev->dev, "failed to read calibration registers\n");
 917                 return ret;
 918         }
 919
 920         irq = platform_get_irq(pdev, 0);
 921         if (irq < 0) {
 922                 dev_err(&pdev->dev, "failed to get irq\n");
 923                 return irq;
 924         }
 925
 926         ret = devm_request_threaded_irq(dev, irq, NULL,
 927                                 twl6030_gpadc_irq_handler,
 928                                 IRQF_ONESHOT, "twl6030_gpadc", indio_dev);
 929
 930         ret = twl6030_gpadc_enable_irq(TWL6030_GPADC_RT_SW1_EOC_MASK);
 931         if (ret < 0) {
 932                 dev_err(&pdev->dev, "failed to enable GPADC interrupt\n");
 933                 return ret;
 934         }
 935
 936         ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, TWL6030_GPADCS,
 937                                         TWL6030_REG_TOGGLE1);
 938         if (ret < 0) {
 939                 dev_err(&pdev->dev, "failed to enable GPADC module\n");
 940                 return ret;
 941         }
 942
 943         indio_dev->name = DRIVER_NAME;
 944         indio_dev->dev.parent = dev;
 945         indio_dev->info = &twl6030_gpadc_iio_info;
 946         indio_dev->modes = INDIO_DIRECT_MODE;
 947         indio_dev->channels = pdata->iio_channels;
 948         indio_dev->num_channels = pdata->nchannels;
 949
 950         return iio_device_register(indio_dev);
 951 }
 952
 953 static int twl6030_gpadc_remove(struct platform_device *pdev)
 954 {
 955         struct iio_dev *indio_dev = platform_get_drvdata(pdev);
 956
 957         twl6030_gpadc_disable_irq(TWL6030_GPADC_RT_SW1_EOC_MASK);
 958         iio_device_unregister(indio_dev);
 959
 960         return 0;
 961 }
 962
 963 #ifdef CONFIG_PM_SLEEP
 964 static int twl6030_gpadc_suspend(struct device *pdev)
 965 {
 966         int ret;
 967
 968         ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, TWL6030_GPADCR,
 969                                 TWL6030_REG_TOGGLE1);
 970         if (ret)
 971                 dev_err(pdev, "error resetting GPADC (%d)!\n", ret);
 972
 973         return 0;
 974 };
 975
 976 static int twl6030_gpadc_resume(struct device *pdev)
 977 {
 978         int ret;
 979
 980         ret = twl_i2c_write_u8(TWL6030_MODULE_ID1, TWL6030_GPADCS,
 981                                 TWL6030_REG_TOGGLE1);
 982         if (ret)
 983                 dev_err(pdev, "error setting GPADC (%d)!\n", ret);
 984
 985         return 0;
 986 };
 987 #endif
 988
 989 static SIMPLE_DEV_PM_OPS(twl6030_gpadc_pm_ops, twl6030_gpadc_suspend,
 990                                         twl6030_gpadc_resume);
 991
 992 static struct platform_driver twl6030_gpadc_driver = {
 993         .probe          = twl6030_gpadc_probe,
 994         .remove         = twl6030_gpadc_remove,
 995         .driver         = {
 996                 .name   = DRIVER_NAME,
 997                 .pm     = &twl6030_gpadc_pm_ops,
 998                 .of_match_table = of_twl6030_match_tbl,
 999         },
1000 };
1001
1002 module_platform_driver(twl6030_gpadc_driver);
1003
1004 MODULE_ALIAS("platform:" DRIVER_NAME);
1005 MODULE_AUTHOR("Balaji T K <balajitk@ti.com>");
1006 MODULE_AUTHOR("Graeme Gregory <gg@slimlogic.co.uk>");
1007 MODULE_AUTHOR("Oleksandr Kozaruk <oleksandr.kozaruk@ti.com");
1008 MODULE_DESCRIPTION("twl6030 ADC driver");
1009 MODULE_LICENSE("GPL");