drivers/mfd/ab8500-gpadc.c

   1 /*
   2  * Copyright (C) ST-Ericsson SA 2010
   3  *
   4  * License Terms: GNU General Public License v2
   5  * Author: Arun R Murthy <arun.murthy@stericsson.com>
   6  * Author: Daniel Willerud <daniel.willerud@stericsson.com>
   7  * Author: Johan Palsson <johan.palsson@stericsson.com>
   8  */
   9 #include <linux/init.h>
  10 #include <linux/module.h>
  11 #include <linux/device.h>
  12 #include <linux/interrupt.h>
  13 #include <linux/spinlock.h>
  14 #include <linux/delay.h>
  15 #include <linux/pm_runtime.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/completion.h>
  18 #include <linux/regulator/consumer.h>
  19 #include <linux/err.h>
  20 #include <linux/slab.h>
  21 #include <linux/list.h>
  22 #include <linux/mfd/abx500.h>
  23 #include <linux/mfd/abx500/ab8500.h>
  24 #include <linux/mfd/abx500/ab8500-gpadc.h>
  25
  26 /*
  27  * GPADC register offsets
  28  * Bank : 0x0A
  29  */
  30 #define AB8500_GPADC_CTRL1_REG          0x00
  31 #define AB8500_GPADC_CTRL2_REG          0x01
  32 #define AB8500_GPADC_CTRL3_REG          0x02
  33 #define AB8500_GPADC_AUTO_TIMER_REG     0x03
  34 #define AB8500_GPADC_STAT_REG           0x04
  35 #define AB8500_GPADC_MANDATAL_REG       0x05
  36 #define AB8500_GPADC_MANDATAH_REG       0x06
  37 #define AB8500_GPADC_AUTODATAL_REG      0x07
  38 #define AB8500_GPADC_AUTODATAH_REG      0x08
  39 #define AB8500_GPADC_MUX_CTRL_REG       0x09
  40 #define AB8540_GPADC_MANDATA2L_REG      0x09
  41 #define AB8540_GPADC_MANDATA2H_REG      0x0A
  42 #define AB8540_GPADC_APEAAX_REG         0x10
  43 #define AB8540_GPADC_APEAAT_REG         0x11
  44 #define AB8540_GPADC_APEAAM_REG         0x12
  45 #define AB8540_GPADC_APEAAH_REG         0x13
  46 #define AB8540_GPADC_APEAAL_REG         0x14
  47
  48 /*
  49  * OTP register offsets
  50  * Bank : 0x15
  51  */
  52 #define AB8500_GPADC_CAL_1      0x0F
  53 #define AB8500_GPADC_CAL_2      0x10
  54 #define AB8500_GPADC_CAL_3      0x11
  55 #define AB8500_GPADC_CAL_4      0x12
  56 #define AB8500_GPADC_CAL_5      0x13
  57 #define AB8500_GPADC_CAL_6      0x14
  58 #define AB8500_GPADC_CAL_7      0x15
  59 /* New calibration for 8540 */
  60 #define AB8540_GPADC_OTP4_REG_7 0x38
  61 #define AB8540_GPADC_OTP4_REG_6 0x39
  62 #define AB8540_GPADC_OTP4_REG_5 0x3A
  63
  64 /* gpadc constants */
  65 #define EN_VINTCORE12           0x04
  66 #define EN_VTVOUT               0x02
  67 #define EN_GPADC                0x01
  68 #define DIS_GPADC               0x00
  69 #define AVG_1                   0x00
  70 #define AVG_4                   0x20
  71 #define AVG_8                   0x40
  72 #define AVG_16                  0x60
  73 #define ADC_SW_CONV             0x04
  74 #define EN_ICHAR                0x80
  75 #define BTEMP_PULL_UP           0x08
  76 #define EN_BUF                  0x40
  77 #define DIS_ZERO                0x00
  78 #define GPADC_BUSY              0x01
  79 #define EN_FALLING              0x10
  80 #define EN_TRIG_EDGE            0x02
  81 #define EN_VBIAS_XTAL_TEMP      0x02
  82
  83 /* GPADC constants from AB8500 spec, UM0836 */
  84 #define ADC_RESOLUTION          1024
  85 #define ADC_CH_BTEMP_MIN        0
  86 #define ADC_CH_BTEMP_MAX        1350
  87 #define ADC_CH_DIETEMP_MIN      0
  88 #define ADC_CH_DIETEMP_MAX      1350
  89 #define ADC_CH_CHG_V_MIN        0
  90 #define ADC_CH_CHG_V_MAX        20030
  91 #define ADC_CH_ACCDET2_MIN      0
  92 #define ADC_CH_ACCDET2_MAX      2500
  93 #define ADC_CH_VBAT_MIN         2300
  94 #define ADC_CH_VBAT_MAX         4800
  95 #define ADC_CH_CHG_I_MIN        0
  96 #define ADC_CH_CHG_I_MAX        1500
  97 #define ADC_CH_BKBAT_MIN        0
  98 #define ADC_CH_BKBAT_MAX        3200
  99
 100 /* GPADC constants from AB8540 spec */
 101 #define ADC_CH_IBAT_MIN         (-6000) /* mA range measured by ADC for ibat */
 102 #define ADC_CH_IBAT_MAX         6000
 103 #define ADC_CH_IBAT_MIN_V       (-60)   /* mV range measured by ADC for ibat */
 104 #define ADC_CH_IBAT_MAX_V       60
 105 #define IBAT_VDROP_L            (-56)  /* mV */
 106 #define IBAT_VDROP_H            56
 107
 108 /* This is used to not lose precision when dividing to get gain and offset */
 109 #define CALIB_SCALE             1000
 110 /*
 111  * Number of bits shift used to not lose precision
 112  * when dividing to get ibat gain.
 113  */
 114 #define CALIB_SHIFT_IBAT        20
 115
 116 /* Time in ms before disabling regulator */
 117 #define GPADC_AUDOSUSPEND_DELAY         1
 118
 119 #define CONVERSION_TIME                 500 /* ms */
 120
 121 enum cal_channels {
 122         ADC_INPUT_VMAIN = 0,
 123         ADC_INPUT_BTEMP,
 124         ADC_INPUT_VBAT,
 125         ADC_INPUT_IBAT,
 126         NBR_CAL_INPUTS,
 127 };
 128
 129 /**
 130  * struct adc_cal_data - Table for storing gain and offset for the calibrated
 131  * ADC channels
 132  * @gain:               Gain of the ADC channel
 133  * @offset:             Offset of the ADC channel
 134  */
 135 struct adc_cal_data {
 136         s64 gain;
 137         s64 offset;
 138         u16 otp_calib_hi;
 139         u16 otp_calib_lo;
 140 };
 141
 142 /**
 143  * struct ab8500_gpadc - AB8500 GPADC device information
 144  * @dev:                        pointer to the struct device
 145  * @node:                       a list of AB8500 GPADCs, hence prepared for
 146                                 reentrance
 147  * @parent:                     pointer to the struct ab8500
 148  * @ab8500_gpadc_complete:      pointer to the struct completion, to indicate
 149  *                              the completion of gpadc conversion
 150  * @ab8500_gpadc_lock:          structure of type mutex
 151  * @regu:                       pointer to the struct regulator
 152  * @irq_sw:                     interrupt number that is used by gpadc for Sw
 153  *                              conversion
 154  * @irq_hw:                     interrupt number that is used by gpadc for Hw
 155  *                              conversion
 156  * @cal_data                    array of ADC calibration data structs
 157  */
 158 struct ab8500_gpadc {
 159         struct device *dev;
 160         struct list_head node;
 161         struct ab8500 *parent;
 162         struct completion ab8500_gpadc_complete;
 163         struct mutex ab8500_gpadc_lock;
 164         struct regulator *regu;
 165         int irq_sw;
 166         int irq_hw;
 167         struct adc_cal_data cal_data[NBR_CAL_INPUTS];
 168 };
 169
 170 static LIST_HEAD(ab8500_gpadc_list);
 171
 172 /**
 173  * ab8500_gpadc_get() - returns a reference to the primary AB8500 GPADC
 174  * (i.e. the first GPADC in the instance list)
 175  */
 176 struct ab8500_gpadc *ab8500_gpadc_get(char *name)
 177 {
 178         struct ab8500_gpadc *gpadc;
 179
 180         list_for_each_entry(gpadc, &ab8500_gpadc_list, node) {
 181                 if (!strcmp(name, dev_name(gpadc->dev)))
 182                         return gpadc;
 183         }
 184
 185         return ERR_PTR(-ENOENT);
 186 }
 187 EXPORT_SYMBOL(ab8500_gpadc_get);
 188
 189 /**
 190  * ab8500_gpadc_ad_to_voltage() - Convert a raw ADC value to a voltage
 191  */
 192 int ab8500_gpadc_ad_to_voltage(struct ab8500_gpadc *gpadc, u8 channel,
 193         int ad_value)
 194 {
 195         int res;
 196
 197         switch (channel) {
 198         case MAIN_CHARGER_V:
 199                 /* For some reason we don't have calibrated data */
 200                 if (!gpadc->cal_data[ADC_INPUT_VMAIN].gain) {
 201                         res = ADC_CH_CHG_V_MIN + (ADC_CH_CHG_V_MAX -
 202                                 ADC_CH_CHG_V_MIN) * ad_value /
 203                                 ADC_RESOLUTION;
 204                         break;
 205                 }
 206                 /* Here we can use the calibrated data */
 207                 res = (int) (ad_value * gpadc->cal_data[ADC_INPUT_VMAIN].gain +
 208                         gpadc->cal_data[ADC_INPUT_VMAIN].offset) / CALIB_SCALE;
 209                 break;
 210
 211         case XTAL_TEMP:
 212         case BAT_CTRL:
 213         case BTEMP_BALL:
 214         case ACC_DETECT1:
 215         case ADC_AUX1:
 216         case ADC_AUX2:
 217                 /* For some reason we don't have calibrated data */
 218                 if (!gpadc->cal_data[ADC_INPUT_BTEMP].gain) {
 219                         res = ADC_CH_BTEMP_MIN + (ADC_CH_BTEMP_MAX -
 220                                 ADC_CH_BTEMP_MIN) * ad_value /
 221                                 ADC_RESOLUTION;
 222                         break;
 223                 }
 224                 /* Here we can use the calibrated data */
 225                 res = (int) (ad_value * gpadc->cal_data[ADC_INPUT_BTEMP].gain +
 226                         gpadc->cal_data[ADC_INPUT_BTEMP].offset) / CALIB_SCALE;
 227                 break;
 228
 229         case MAIN_BAT_V:
 230         case VBAT_TRUE_MEAS:
 231                 /* For some reason we don't have calibrated data */
 232                 if (!gpadc->cal_data[ADC_INPUT_VBAT].gain) {
 233                         res = ADC_CH_VBAT_MIN + (ADC_CH_VBAT_MAX -
 234                                 ADC_CH_VBAT_MIN) * ad_value /
 235                                 ADC_RESOLUTION;
 236                         break;
 237                 }
 238                 /* Here we can use the calibrated data */
 239                 res = (int) (ad_value * gpadc->cal_data[ADC_INPUT_VBAT].gain +
 240                         gpadc->cal_data[ADC_INPUT_VBAT].offset) / CALIB_SCALE;
 241                 break;
 242
 243         case DIE_TEMP:
 244                 res = ADC_CH_DIETEMP_MIN +
 245                         (ADC_CH_DIETEMP_MAX - ADC_CH_DIETEMP_MIN) * ad_value /
 246                         ADC_RESOLUTION;
 247                 break;
 248
 249         case ACC_DETECT2:
 250                 res = ADC_CH_ACCDET2_MIN +
 251                         (ADC_CH_ACCDET2_MAX - ADC_CH_ACCDET2_MIN) * ad_value /
 252                         ADC_RESOLUTION;
 253                 break;
 254
 255         case VBUS_V:
 256                 res = ADC_CH_CHG_V_MIN +
 257                         (ADC_CH_CHG_V_MAX - ADC_CH_CHG_V_MIN) * ad_value /
 258                         ADC_RESOLUTION;
 259                 break;
 260
 261         case MAIN_CHARGER_C:
 262         case USB_CHARGER_C:
 263                 res = ADC_CH_CHG_I_MIN +
 264                         (ADC_CH_CHG_I_MAX - ADC_CH_CHG_I_MIN) * ad_value /
 265                         ADC_RESOLUTION;
 266                 break;
 267
 268         case BK_BAT_V:
 269                 res = ADC_CH_BKBAT_MIN +
 270                         (ADC_CH_BKBAT_MAX - ADC_CH_BKBAT_MIN) * ad_value /
 271                         ADC_RESOLUTION;
 272                 break;
 273
 274         case IBAT_VIRTUAL_CHANNEL:
 275                 /* For some reason we don't have calibrated data */
 276                 if (!gpadc->cal_data[ADC_INPUT_IBAT].gain) {
 277                         res = ADC_CH_IBAT_MIN + (ADC_CH_IBAT_MAX -
 278                                 ADC_CH_IBAT_MIN) * ad_value /
 279                                 ADC_RESOLUTION;
 280                         break;
 281                 }
 282                 /* Here we can use the calibrated data */
 283                 res = (int) (ad_value * gpadc->cal_data[ADC_INPUT_IBAT].gain +
 284                                 gpadc->cal_data[ADC_INPUT_IBAT].offset)
 285                                 >> CALIB_SHIFT_IBAT;
 286                 break;
 287
 288         default:
 289                 dev_err(gpadc->dev,
 290                         "unknown channel, not possible to convert\n");
 291                 res = -EINVAL;
 292                 break;
 293
 294         }
 295         return res;
 296 }
 297 EXPORT_SYMBOL(ab8500_gpadc_ad_to_voltage);
 298
 299 /**
 300  * ab8500_gpadc_sw_hw_convert() - gpadc conversion
 301  * @channel:    analog channel to be converted to digital data
 302  * @avg_sample:  number of ADC sample to average
 303  * @trig_egde:  selected ADC trig edge
 304  * @trig_timer: selected ADC trigger delay timer
 305  * @conv_type: selected conversion type (HW or SW conversion)
 306  *
 307  * This function converts the selected analog i/p to digital
 308  * data.
 309  */
 310 int ab8500_gpadc_sw_hw_convert(struct ab8500_gpadc *gpadc, u8 channel,
 311                 u8 avg_sample, u8 trig_edge, u8 trig_timer, u8 conv_type)
 312 {
 313         int ad_value;
 314         int voltage;
 315
 316         ad_value = ab8500_gpadc_read_raw(gpadc, channel, avg_sample,
 317                         trig_edge, trig_timer, conv_type);
 318
 319         /* On failure retry a second time */
 320         if (ad_value < 0)
 321                 ad_value = ab8500_gpadc_read_raw(gpadc, channel, avg_sample,
 322                         trig_edge, trig_timer, conv_type);
 323         if (ad_value < 0) {
 324                 dev_err(gpadc->dev, "GPADC raw value failed ch: %d\n",
 325                                 channel);
 326                 return ad_value;
 327         }
 328
 329         voltage = ab8500_gpadc_ad_to_voltage(gpadc, channel, ad_value);
 330         if (voltage < 0)
 331                 dev_err(gpadc->dev,
 332                         "GPADC to voltage conversion failed ch: %d AD: 0x%x\n",
 333                         channel, ad_value);
 334
 335         return voltage;
 336 }
 337 EXPORT_SYMBOL(ab8500_gpadc_sw_hw_convert);
 338
 339 /**
 340  * ab8500_gpadc_read_raw() - gpadc read
 341  * @channel:    analog channel to be read
 342  * @avg_sample:  number of ADC sample to average
 343  * @trig_edge:  selected trig edge
 344  * @trig_timer: selected ADC trigger delay timer
 345  * @conv_type: selected conversion type (HW or SW conversion)
 346  *
 347  * This function obtains the raw ADC value for an hardware conversion,
 348  * this then needs to be converted by calling ab8500_gpadc_ad_to_voltage()
 349  */
 350 int ab8500_gpadc_read_raw(struct ab8500_gpadc *gpadc, u8 channel,
 351                 u8 avg_sample, u8 trig_edge, u8 trig_timer, u8 conv_type)
 352 {
 353         return ab8500_gpadc_double_read_raw(gpadc, channel, avg_sample,
 354                                             trig_edge, trig_timer, conv_type,
 355                                             NULL);
 356 }
 357
 358 int ab8500_gpadc_double_read_raw(struct ab8500_gpadc *gpadc, u8 channel,
 359                 u8 avg_sample, u8 trig_edge, u8 trig_timer, u8 conv_type,
 360                 int *ibat)
 361 {
 362         int ret;
 363         int looplimit = 0;
 364         unsigned long completion_timeout;
 365         u8 val, low_data, high_data, low_data2, high_data2;
 366         u8 val_reg1 = 0;
 367         unsigned int delay_min = 0;
 368         unsigned int delay_max = 0;
 369         u8 data_low_addr, data_high_addr;
 370
 371         if (!gpadc)
 372                 return -ENODEV;
 373
 374         /* check if convertion is supported */
 375         if ((gpadc->irq_sw < 0) && (conv_type == ADC_SW))
 376                 return -ENOTSUPP;
 377         if ((gpadc->irq_hw < 0) && (conv_type == ADC_HW))
 378                 return -ENOTSUPP;
 379
 380         mutex_lock(&gpadc->ab8500_gpadc_lock);
 381         /* Enable VTVout LDO this is required for GPADC */
 382         pm_runtime_get_sync(gpadc->dev);
 383
 384         /* Check if ADC is not busy, lock and proceed */
 385         do {
 386                 ret = abx500_get_register_interruptible(gpadc->dev,
 387                         AB8500_GPADC, AB8500_GPADC_STAT_REG, &val);
 388                 if (ret < 0)
 389                         goto out;
 390                 if (!(val & GPADC_BUSY))
 391                         break;
 392                 msleep(20);
 393         } while (++looplimit < 10);
 394         if (looplimit >= 10 && (val & GPADC_BUSY)) {
 395                 dev_err(gpadc->dev, "gpadc_conversion: GPADC busy");
 396                 ret = -EINVAL;
 397                 goto out;
 398         }
 399
 400         /* Enable GPADC */
 401         val_reg1 |= EN_GPADC;
 402
 403         /* Select the channel source and set average samples */
 404         switch (avg_sample) {
 405         case SAMPLE_1:
 406                 val = channel | AVG_1;
 407                 break;
 408         case SAMPLE_4:
 409                 val = channel | AVG_4;
 410                 break;
 411         case SAMPLE_8:
 412                 val = channel | AVG_8;
 413                 break;
 414         default:
 415                 val = channel | AVG_16;
 416                 break;
 417         }
 418
 419         if (conv_type == ADC_HW) {
 420                 ret = abx500_set_register_interruptible(gpadc->dev,
 421                                 AB8500_GPADC, AB8500_GPADC_CTRL3_REG, val);
 422                 val_reg1 |= EN_TRIG_EDGE;
 423                 if (trig_edge)
 424                         val_reg1 |= EN_FALLING;
 425         } else
 426                 ret = abx500_set_register_interruptible(gpadc->dev,
 427                                 AB8500_GPADC, AB8500_GPADC_CTRL2_REG, val);
 428         if (ret < 0) {
 429                 dev_err(gpadc->dev,
 430                         "gpadc_conversion: set avg samples failed\n");
 431                 goto out;
 432         }
 433
 434         /*
 435          * Enable ADC, buffering, select rising edge and enable ADC path
 436          * charging current sense if it needed, ABB 3.0 needs some special
 437          * treatment too.
 438          */
 439         switch (channel) {
 440         case MAIN_CHARGER_C:
 441         case USB_CHARGER_C:
 442                 val_reg1 |= EN_BUF | EN_ICHAR;
 443                 break;
 444         case BTEMP_BALL:
 445                 if (!is_ab8500_2p0_or_earlier(gpadc->parent)) {
 446                         val_reg1 |= EN_BUF | BTEMP_PULL_UP;
 447                         /*
 448                         * Delay might be needed for ABB8500 cut 3.0, if not,
 449                         * remove when hardware will be availible
 450                         */
 451                         delay_min = 1000; /* Delay in micro seconds */
 452                         delay_max = 10000; /* large range optimises sleepmode */
 453                         break;
 454                 }
 455                 /* Intentional fallthrough */
 456         default:
 457                 val_reg1 |= EN_BUF;
 458                 break;
 459         }
 460
 461         /* Write configuration to register */
 462         ret = abx500_set_register_interruptible(gpadc->dev,
 463                 AB8500_GPADC, AB8500_GPADC_CTRL1_REG, val_reg1);
 464         if (ret < 0) {
 465                 dev_err(gpadc->dev,
 466                         "gpadc_conversion: set Control register failed\n");
 467                 goto out;
 468         }
 469
 470         if (delay_min != 0)
 471                 usleep_range(delay_min, delay_max);
 472
 473         if (conv_type == ADC_HW) {
 474                 /* Set trigger delay timer */
 475                 ret = abx500_set_register_interruptible(gpadc->dev,
 476                         AB8500_GPADC, AB8500_GPADC_AUTO_TIMER_REG, trig_timer);
 477                 if (ret < 0) {
 478                         dev_err(gpadc->dev,
 479                                 "gpadc_conversion: trig timer failed\n");
 480                         goto out;
 481                 }
 482                 completion_timeout = 2 * HZ;
 483                 data_low_addr = AB8500_GPADC_AUTODATAL_REG;
 484                 data_high_addr = AB8500_GPADC_AUTODATAH_REG;
 485         } else {
 486                 /* Start SW conversion */
 487                 ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
 488                         AB8500_GPADC, AB8500_GPADC_CTRL1_REG,
 489                         ADC_SW_CONV, ADC_SW_CONV);
 490                 if (ret < 0) {
 491                         dev_err(gpadc->dev,
 492                                 "gpadc_conversion: start s/w conv failed\n");
 493                         goto out;
 494                 }
 495                 completion_timeout = msecs_to_jiffies(CONVERSION_TIME);
 496                 data_low_addr = AB8500_GPADC_MANDATAL_REG;
 497                 data_high_addr = AB8500_GPADC_MANDATAH_REG;
 498         }
 499
 500         /* wait for completion of conversion */
 501         if (!wait_for_completion_timeout(&gpadc->ab8500_gpadc_complete,
 502                         completion_timeout)) {
 503                 dev_err(gpadc->dev,
 504                         "timeout didn't receive GPADC conv interrupt\n");
 505                 ret = -EINVAL;
 506                 goto out;
 507         }
 508
 509         /* Read the converted RAW data */
 510         ret = abx500_get_register_interruptible(gpadc->dev,
 511                         AB8500_GPADC, data_low_addr, &low_data);
 512         if (ret < 0) {
 513                 dev_err(gpadc->dev, "gpadc_conversion: read low data failed\n");
 514                 goto out;
 515         }
 516
 517         ret = abx500_get_register_interruptible(gpadc->dev,
 518                 AB8500_GPADC, data_high_addr, &high_data);
 519         if (ret < 0) {
 520                 dev_err(gpadc->dev, "gpadc_conversion: read high data failed\n");
 521                 goto out;
 522         }
 523
 524         /* Check if double convertion is required */
 525         if ((channel == BAT_CTRL_AND_IBAT) ||
 526                         (channel == VBAT_MEAS_AND_IBAT) ||
 527                         (channel == VBAT_TRUE_MEAS_AND_IBAT) ||
 528                         (channel == BAT_TEMP_AND_IBAT)) {
 529
 530                 if (conv_type == ADC_HW) {
 531                         /* not supported */
 532                         ret = -ENOTSUPP;
 533                         dev_err(gpadc->dev,
 534                                 "gpadc_conversion: only SW double conversion supported\n");
 535                         goto out;
 536                 } else {
 537                         /* Read the converted RAW data 2 */
 538                         ret = abx500_get_register_interruptible(gpadc->dev,
 539                                 AB8500_GPADC, AB8540_GPADC_MANDATA2L_REG,
 540                                 &low_data2);
 541                         if (ret < 0) {
 542                                 dev_err(gpadc->dev,
 543                                         "gpadc_conversion: read sw low data 2 failed\n");
 544                                 goto out;
 545                         }
 546
 547                         ret = abx500_get_register_interruptible(gpadc->dev,
 548                                 AB8500_GPADC, AB8540_GPADC_MANDATA2H_REG,
 549                                 &high_data2);
 550                         if (ret < 0) {
 551                                 dev_err(gpadc->dev,
 552                                         "gpadc_conversion: read sw high data 2 failed\n");
 553                                 goto out;
 554                         }
 555                         if (ibat != NULL) {
 556                                 *ibat = (high_data2 << 8) | low_data2;
 557                         } else {
 558                                 dev_warn(gpadc->dev,
 559                                         "gpadc_conversion: ibat not stored\n");
 560                         }
 561
 562                 }
 563         }
 564
 565         /* Disable GPADC */
 566         ret = abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
 567                 AB8500_GPADC_CTRL1_REG, DIS_GPADC);
 568         if (ret < 0) {
 569                 dev_err(gpadc->dev, "gpadc_conversion: disable gpadc failed\n");
 570                 goto out;
 571         }
 572
 573         /* Disable VTVout LDO this is required for GPADC */
 574         pm_runtime_mark_last_busy(gpadc->dev);
 575         pm_runtime_put_autosuspend(gpadc->dev);
 576
 577         mutex_unlock(&gpadc->ab8500_gpadc_lock);
 578
 579         return (high_data << 8) | low_data;
 580
 581 out:
 582         /*
 583          * It has shown to be needed to turn off the GPADC if an error occurs,
 584          * otherwise we might have problem when waiting for the busy bit in the
 585          * GPADC status register to go low. In V1.1 there wait_for_completion
 586          * seems to timeout when waiting for an interrupt.. Not seen in V2.0
 587          */
 588         (void) abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
 589                 AB8500_GPADC_CTRL1_REG, DIS_GPADC);
 590         pm_runtime_put(gpadc->dev);
 591         mutex_unlock(&gpadc->ab8500_gpadc_lock);
 592         dev_err(gpadc->dev,
 593                 "gpadc_conversion: Failed to AD convert channel %d\n", channel);
 594         return ret;
 595 }
 596 EXPORT_SYMBOL(ab8500_gpadc_read_raw);
 597
 598 /**
 599  * ab8500_bm_gpadcconvend_handler() - isr for gpadc conversion completion
 600  * @irq:        irq number
 601  * @data:       pointer to the data passed during request irq
 602  *
 603  * This is a interrupt service routine for gpadc conversion completion.
 604  * Notifies the gpadc completion is completed and the converted raw value
 605  * can be read from the registers.
 606  * Returns IRQ status(IRQ_HANDLED)
 607  */
 608 static irqreturn_t ab8500_bm_gpadcconvend_handler(int irq, void *_gpadc)
 609 {
 610         struct ab8500_gpadc *gpadc = _gpadc;
 611
 612         complete(&gpadc->ab8500_gpadc_complete);
 613
 614         return IRQ_HANDLED;
 615 }
 616
 617 static int otp_cal_regs[] = {
 618         AB8500_GPADC_CAL_1,
 619         AB8500_GPADC_CAL_2,
 620         AB8500_GPADC_CAL_3,
 621         AB8500_GPADC_CAL_4,
 622         AB8500_GPADC_CAL_5,
 623         AB8500_GPADC_CAL_6,
 624         AB8500_GPADC_CAL_7,
 625 };
 626
 627 static int otp4_cal_regs[] = {
 628         AB8540_GPADC_OTP4_REG_7,
 629         AB8540_GPADC_OTP4_REG_6,
 630         AB8540_GPADC_OTP4_REG_5,
 631 };
 632
 633 static void ab8500_gpadc_read_calibration_data(struct ab8500_gpadc *gpadc)
 634 {
 635         int i;
 636         int ret[ARRAY_SIZE(otp_cal_regs)];
 637         u8 gpadc_cal[ARRAY_SIZE(otp_cal_regs)];
 638         int ret_otp4[ARRAY_SIZE(otp4_cal_regs)];
 639         u8 gpadc_otp4[ARRAY_SIZE(otp4_cal_regs)];
 640         int vmain_high, vmain_low;
 641         int btemp_high, btemp_low;
 642         int vbat_high, vbat_low;
 643         int ibat_high, ibat_low;
 644         s64 V_gain, V_offset, V2A_gain, V2A_offset;
 645         struct ab8500 *ab8500;
 646
 647         ab8500 = gpadc->parent;
 648
 649         /* First we read all OTP registers and store the error code */
 650         for (i = 0; i < ARRAY_SIZE(otp_cal_regs); i++) {
 651                 ret[i] = abx500_get_register_interruptible(gpadc->dev,
 652                         AB8500_OTP_EMUL, otp_cal_regs[i],  &gpadc_cal[i]);
 653                 if (ret[i] < 0)
 654                         dev_err(gpadc->dev, "%s: read otp reg 0x%02x failed\n",
 655                                 __func__, otp_cal_regs[i]);
 656         }
 657
 658         /*
 659          * The ADC calibration data is stored in OTP registers.
 660          * The layout of the calibration data is outlined below and a more
 661          * detailed description can be found in UM0836
 662          *
 663          * vm_h/l = vmain_high/low
 664          * bt_h/l = btemp_high/low
 665          * vb_h/l = vbat_high/low
 666          *
 667          * Data bits 8500/9540:
 668          * | 7     | 6     | 5     | 4     | 3     | 2     | 1     | 0
 669          * |.......|.......|.......|.......|.......|.......|.......|.......
 670          * |                                               | vm_h9 | vm_h8
 671          * |.......|.......|.......|.......|.......|.......|.......|.......
 672          * |               | vm_h7 | vm_h6 | vm_h5 | vm_h4 | vm_h3 | vm_h2
 673          * |.......|.......|.......|.......|.......|.......|.......|.......
 674          * | vm_h1 | vm_h0 | vm_l4 | vm_l3 | vm_l2 | vm_l1 | vm_l0 | bt_h9
 675          * |.......|.......|.......|.......|.......|.......|.......|.......
 676          * | bt_h8 | bt_h7 | bt_h6 | bt_h5 | bt_h4 | bt_h3 | bt_h2 | bt_h1
 677          * |.......|.......|.......|.......|.......|.......|.......|.......
 678          * | bt_h0 | bt_l4 | bt_l3 | bt_l2 | bt_l1 | bt_l0 | vb_h9 | vb_h8
 679          * |.......|.......|.......|.......|.......|.......|.......|.......
 680          * | vb_h7 | vb_h6 | vb_h5 | vb_h4 | vb_h3 | vb_h2 | vb_h1 | vb_h0
 681          * |.......|.......|.......|.......|.......|.......|.......|.......
 682          * | vb_l5 | vb_l4 | vb_l3 | vb_l2 | vb_l1 | vb_l0 |
 683          * |.......|.......|.......|.......|.......|.......|.......|.......
 684          *
 685          * Data bits 8540:
 686          * OTP2
 687          * | 7     | 6     | 5     | 4     | 3     | 2     | 1     | 0
 688          * |.......|.......|.......|.......|.......|.......|.......|.......
 689          * |
 690          * |.......|.......|.......|.......|.......|.......|.......|.......
 691          * | vm_h9 | vm_h8 | vm_h7 | vm_h6 | vm_h5 | vm_h4 | vm_h3 | vm_h2
 692          * |.......|.......|.......|.......|.......|.......|.......|.......
 693          * | vm_h1 | vm_h0 | vm_l4 | vm_l3 | vm_l2 | vm_l1 | vm_l0 | bt_h9
 694          * |.......|.......|.......|.......|.......|.......|.......|.......
 695          * | bt_h8 | bt_h7 | bt_h6 | bt_h5 | bt_h4 | bt_h3 | bt_h2 | bt_h1
 696          * |.......|.......|.......|.......|.......|.......|.......|.......
 697          * | bt_h0 | bt_l4 | bt_l3 | bt_l2 | bt_l1 | bt_l0 | vb_h9 | vb_h8
 698          * |.......|.......|.......|.......|.......|.......|.......|.......
 699          * | vb_h7 | vb_h6 | vb_h5 | vb_h4 | vb_h3 | vb_h2 | vb_h1 | vb_h0
 700          * |.......|.......|.......|.......|.......|.......|.......|.......
 701          * | vb_l5 | vb_l4 | vb_l3 | vb_l2 | vb_l1 | vb_l0 |
 702          * |.......|.......|.......|.......|.......|.......|.......|.......
 703          *
 704          * Data bits 8540:
 705          * OTP4
 706          * | 7     | 6     | 5     | 4     | 3     | 2     | 1     | 0
 707          * |.......|.......|.......|.......|.......|.......|.......|.......
 708          * |                                       | ib_h9 | ib_h8 | ib_h7
 709          * |.......|.......|.......|.......|.......|.......|.......|.......
 710          * | ib_h6 | ib_h5 | ib_h4 | ib_h3 | ib_h2 | ib_h1 | ib_h0 | ib_l5
 711          * |.......|.......|.......|.......|.......|.......|.......|.......
 712          * | ib_l4 | ib_l3 | ib_l2 | ib_l1 | ib_l0 |
 713          *
 714          *
 715          * Ideal output ADC codes corresponding to injected input voltages
 716          * during manufacturing is:
 717          *
 718          * vmain_high: Vin = 19500mV / ADC ideal code = 997
 719          * vmain_low:  Vin = 315mV   / ADC ideal code = 16
 720          * btemp_high: Vin = 1300mV  / ADC ideal code = 985
 721          * btemp_low:  Vin = 21mV    / ADC ideal code = 16
 722          * vbat_high:  Vin = 4700mV  / ADC ideal code = 982
 723          * vbat_low:   Vin = 2380mV  / ADC ideal code = 33
 724          */
 725
 726         if (is_ab8540(ab8500)) {
 727                 /* Calculate gain and offset for VMAIN if all reads succeeded*/
 728                 if (!(ret[1] < 0 || ret[2] < 0)) {
 729                         vmain_high = (((gpadc_cal[1] & 0xFF) << 2) |
 730                                 ((gpadc_cal[2] & 0xC0) >> 6));
 731                         vmain_low = ((gpadc_cal[2] & 0x3E) >> 1);
 732
 733                         gpadc->cal_data[ADC_INPUT_VMAIN].otp_calib_hi =
 734                                 (u16)vmain_high;
 735                         gpadc->cal_data[ADC_INPUT_VMAIN].otp_calib_lo =
 736                                 (u16)vmain_low;
 737
 738                         gpadc->cal_data[ADC_INPUT_VMAIN].gain = CALIB_SCALE *
 739                                 (19500 - 315) / (vmain_high - vmain_low);
 740                         gpadc->cal_data[ADC_INPUT_VMAIN].offset = CALIB_SCALE *
 741                                 19500 - (CALIB_SCALE * (19500 - 315) /
 742                                 (vmain_high - vmain_low)) * vmain_high;
 743                 } else {
 744                 gpadc->cal_data[ADC_INPUT_VMAIN].gain = 0;
 745                 }
 746
 747                 /* Read IBAT calibration Data */
 748                 for (i = 0; i < ARRAY_SIZE(otp4_cal_regs); i++) {
 749                         ret_otp4[i] = abx500_get_register_interruptible(
 750                                         gpadc->dev, AB8500_OTP_EMUL,
 751                                         otp4_cal_regs[i],  &gpadc_otp4[i]);
 752                         if (ret_otp4[i] < 0)
 753                                 dev_err(gpadc->dev,
 754                                         "%s: read otp4 reg 0x%02x failed\n",
 755                                         __func__, otp4_cal_regs[i]);
 756                 }
 757
 758                 /* Calculate gain and offset for IBAT if all reads succeeded */
 759                 if (!(ret_otp4[0] < 0 || ret_otp4[1] < 0 || ret_otp4[2] < 0)) {
 760                         ibat_high = (((gpadc_otp4[0] & 0x07) << 7) |
 761                                 ((gpadc_otp4[1] & 0xFE) >> 1));
 762                         ibat_low = (((gpadc_otp4[1] & 0x01) << 5) |
 763                                 ((gpadc_otp4[2] & 0xF8) >> 3));
 764
 765                         gpadc->cal_data[ADC_INPUT_IBAT].otp_calib_hi =
 766                                 (u16)ibat_high;
 767                         gpadc->cal_data[ADC_INPUT_IBAT].otp_calib_lo =
 768                                 (u16)ibat_low;
 769
 770                         V_gain = ((IBAT_VDROP_H - IBAT_VDROP_L)
 771                                 << CALIB_SHIFT_IBAT) / (ibat_high - ibat_low);
 772
 773                         V_offset = (IBAT_VDROP_H << CALIB_SHIFT_IBAT) -
 774                                 (((IBAT_VDROP_H - IBAT_VDROP_L) <<
 775                                 CALIB_SHIFT_IBAT) / (ibat_high - ibat_low))
 776                                 * ibat_high;
 777                         /*
 778                          * Result obtained is in mV (at a scale factor),
 779                          * we need to calculate gain and offset to get mA
 780                          */
 781                         V2A_gain = (ADC_CH_IBAT_MAX - ADC_CH_IBAT_MIN)/
 782                                 (ADC_CH_IBAT_MAX_V - ADC_CH_IBAT_MIN_V);
 783                         V2A_offset = ((ADC_CH_IBAT_MAX_V * ADC_CH_IBAT_MIN -
 784                                 ADC_CH_IBAT_MAX * ADC_CH_IBAT_MIN_V)
 785                                 << CALIB_SHIFT_IBAT)
 786                                 / (ADC_CH_IBAT_MAX_V - ADC_CH_IBAT_MIN_V);
 787
 788                         gpadc->cal_data[ADC_INPUT_IBAT].gain =
 789                                 V_gain * V2A_gain;
 790                         gpadc->cal_data[ADC_INPUT_IBAT].offset =
 791                                 V_offset * V2A_gain + V2A_offset;
 792                 } else {
 793                         gpadc->cal_data[ADC_INPUT_IBAT].gain = 0;
 794                 }
 795
 796                 dev_dbg(gpadc->dev, "IBAT gain %llu offset %llu\n",
 797                         gpadc->cal_data[ADC_INPUT_IBAT].gain,
 798                         gpadc->cal_data[ADC_INPUT_IBAT].offset);
 799         } else {
 800                 /* Calculate gain and offset for VMAIN if all reads succeeded */
 801                 if (!(ret[0] < 0 || ret[1] < 0 || ret[2] < 0)) {
 802                         vmain_high = (((gpadc_cal[0] & 0x03) << 8) |
 803                                 ((gpadc_cal[1] & 0x3F) << 2) |
 804                                 ((gpadc_cal[2] & 0xC0) >> 6));
 805                         vmain_low = ((gpadc_cal[2] & 0x3E) >> 1);
 806
 807                         gpadc->cal_data[ADC_INPUT_VMAIN].otp_calib_hi =
 808                                 (u16)vmain_high;
 809                         gpadc->cal_data[ADC_INPUT_VMAIN].otp_calib_lo =
 810                                 (u16)vmain_low;
 811
 812                         gpadc->cal_data[ADC_INPUT_VMAIN].gain = CALIB_SCALE *
 813                                 (19500 - 315) / (vmain_high - vmain_low);
 814
 815                         gpadc->cal_data[ADC_INPUT_VMAIN].offset = CALIB_SCALE *
 816                                 19500 - (CALIB_SCALE * (19500 - 315) /
 817                                 (vmain_high - vmain_low)) * vmain_high;
 818                 } else {
 819                         gpadc->cal_data[ADC_INPUT_VMAIN].gain = 0;
 820                 }
 821         }
 822
 823         /* Calculate gain and offset for BTEMP if all reads succeeded */
 824         if (!(ret[2] < 0 || ret[3] < 0 || ret[4] < 0)) {
 825                 btemp_high = (((gpadc_cal[2] & 0x01) << 9) |
 826                         (gpadc_cal[3] << 1) | ((gpadc_cal[4] & 0x80) >> 7));
 827                 btemp_low = ((gpadc_cal[4] & 0x7C) >> 2);
 828
 829                 gpadc->cal_data[ADC_INPUT_BTEMP].otp_calib_hi = (u16)btemp_high;
 830                 gpadc->cal_data[ADC_INPUT_BTEMP].otp_calib_lo = (u16)btemp_low;
 831
 832                 gpadc->cal_data[ADC_INPUT_BTEMP].gain =
 833                         CALIB_SCALE * (1300 - 21) / (btemp_high - btemp_low);
 834                 gpadc->cal_data[ADC_INPUT_BTEMP].offset = CALIB_SCALE * 1300 -
 835                         (CALIB_SCALE * (1300 - 21) / (btemp_high - btemp_low))
 836                         * btemp_high;
 837         } else {
 838                 gpadc->cal_data[ADC_INPUT_BTEMP].gain = 0;
 839         }
 840
 841         /* Calculate gain and offset for VBAT if all reads succeeded */
 842         if (!(ret[4] < 0 || ret[5] < 0 || ret[6] < 0)) {
 843                 vbat_high = (((gpadc_cal[4] & 0x03) << 8) | gpadc_cal[5]);
 844                 vbat_low = ((gpadc_cal[6] & 0xFC) >> 2);
 845
 846                 gpadc->cal_data[ADC_INPUT_VBAT].otp_calib_hi = (u16)vbat_high;
 847                 gpadc->cal_data[ADC_INPUT_VBAT].otp_calib_lo = (u16)vbat_low;
 848
 849                 gpadc->cal_data[ADC_INPUT_VBAT].gain = CALIB_SCALE *
 850                         (4700 - 2380) / (vbat_high - vbat_low);
 851                 gpadc->cal_data[ADC_INPUT_VBAT].offset = CALIB_SCALE * 4700 -
 852                         (CALIB_SCALE * (4700 - 2380) /
 853                         (vbat_high - vbat_low)) * vbat_high;
 854         } else {
 855                 gpadc->cal_data[ADC_INPUT_VBAT].gain = 0;
 856         }
 857
 858         dev_dbg(gpadc->dev, "VMAIN gain %llu offset %llu\n",
 859                 gpadc->cal_data[ADC_INPUT_VMAIN].gain,
 860                 gpadc->cal_data[ADC_INPUT_VMAIN].offset);
 861
 862         dev_dbg(gpadc->dev, "BTEMP gain %llu offset %llu\n",
 863                 gpadc->cal_data[ADC_INPUT_BTEMP].gain,
 864                 gpadc->cal_data[ADC_INPUT_BTEMP].offset);
 865
 866         dev_dbg(gpadc->dev, "VBAT gain %llu offset %llu\n",
 867                 gpadc->cal_data[ADC_INPUT_VBAT].gain,
 868                 gpadc->cal_data[ADC_INPUT_VBAT].offset);
 869 }
 870
 871 #ifdef CONFIG_PM
 872 static int ab8500_gpadc_runtime_suspend(struct device *dev)
 873 {
 874         struct ab8500_gpadc *gpadc = dev_get_drvdata(dev);
 875
 876         regulator_disable(gpadc->regu);
 877         return 0;
 878 }
 879
 880 static int ab8500_gpadc_runtime_resume(struct device *dev)
 881 {
 882         struct ab8500_gpadc *gpadc = dev_get_drvdata(dev);
 883         int ret;
 884
 885         ret = regulator_enable(gpadc->regu);
 886         if (ret)
 887                 dev_err(dev, "Failed to enable vtvout LDO: %d\n", ret);
 888         return ret;
 889 }
 890 #endif
 891
 892 #ifdef CONFIG_PM_SLEEP
 893 static int ab8500_gpadc_suspend(struct device *dev)
 894 {
 895         struct ab8500_gpadc *gpadc = dev_get_drvdata(dev);
 896
 897         mutex_lock(&gpadc->ab8500_gpadc_lock);
 898
 899         pm_runtime_get_sync(dev);
 900
 901         regulator_disable(gpadc->regu);
 902         return 0;
 903 }
 904
 905 static int ab8500_gpadc_resume(struct device *dev)
 906 {
 907         struct ab8500_gpadc *gpadc = dev_get_drvdata(dev);
 908         int ret;
 909
 910         ret = regulator_enable(gpadc->regu);
 911         if (ret)
 912                 dev_err(dev, "Failed to enable vtvout LDO: %d\n", ret);
 913
 914         pm_runtime_mark_last_busy(gpadc->dev);
 915         pm_runtime_put_autosuspend(gpadc->dev);
 916
 917         mutex_unlock(&gpadc->ab8500_gpadc_lock);
 918         return ret;
 919 }
 920 #endif
 921
 922 static int ab8500_gpadc_probe(struct platform_device *pdev)
 923 {
 924         int ret = 0;
 925         struct ab8500_gpadc *gpadc;
 926
 927         gpadc = devm_kzalloc(&pdev->dev,
 928                              sizeof(struct ab8500_gpadc), GFP_KERNEL);
 929         if (!gpadc)
 930                 return -ENOMEM;
 931
 932         gpadc->irq_sw = platform_get_irq_byname(pdev, "SW_CONV_END");
 933         if (gpadc->irq_sw < 0)
 934                 dev_err(gpadc->dev, "failed to get platform sw_conv_end irq\n");
 935
 936         gpadc->irq_hw = platform_get_irq_byname(pdev, "HW_CONV_END");
 937         if (gpadc->irq_hw < 0)
 938                 dev_err(gpadc->dev, "failed to get platform hw_conv_end irq\n");
 939
 940         gpadc->dev = &pdev->dev;
 941         gpadc->parent = dev_get_drvdata(pdev->dev.parent);
 942         mutex_init(&gpadc->ab8500_gpadc_lock);
 943
 944         /* Initialize completion used to notify completion of conversion */
 945         init_completion(&gpadc->ab8500_gpadc_complete);
 946
 947         /* Register interrupts */
 948         if (gpadc->irq_sw >= 0) {
 949                 ret = request_threaded_irq(gpadc->irq_sw, NULL,
 950                         ab8500_bm_gpadcconvend_handler,
 951                         IRQF_NO_SUSPEND | IRQF_SHARED | IRQF_ONESHOT,
 952                         "ab8500-gpadc-sw",
 953                         gpadc);
 954                 if (ret < 0) {
 955                         dev_err(gpadc->dev,
 956                                 "Failed to register interrupt irq: %d\n",
 957                                 gpadc->irq_sw);
 958                         goto fail;
 959                 }
 960         }
 961
 962         if (gpadc->irq_hw >= 0) {
 963                 ret = request_threaded_irq(gpadc->irq_hw, NULL,
 964                         ab8500_bm_gpadcconvend_handler,
 965                         IRQF_NO_SUSPEND | IRQF_SHARED | IRQF_ONESHOT,
 966                         "ab8500-gpadc-hw",
 967                         gpadc);
 968                 if (ret < 0) {
 969                         dev_err(gpadc->dev,
 970                                 "Failed to register interrupt irq: %d\n",
 971                                 gpadc->irq_hw);
 972                         goto fail_irq;
 973                 }
 974         }
 975
 976         /* VTVout LDO used to power up ab8500-GPADC */
 977         gpadc->regu = devm_regulator_get(&pdev->dev, "vddadc");
 978         if (IS_ERR(gpadc->regu)) {
 979                 ret = PTR_ERR(gpadc->regu);
 980                 dev_err(gpadc->dev, "failed to get vtvout LDO\n");
 981                 goto fail_irq;
 982         }
 983
 984         platform_set_drvdata(pdev, gpadc);
 985
 986         ret = regulator_enable(gpadc->regu);
 987         if (ret) {
 988                 dev_err(gpadc->dev, "Failed to enable vtvout LDO: %d\n", ret);
 989                 goto fail_enable;
 990         }
 991
 992         pm_runtime_set_autosuspend_delay(gpadc->dev, GPADC_AUDOSUSPEND_DELAY);
 993         pm_runtime_use_autosuspend(gpadc->dev);
 994         pm_runtime_set_active(gpadc->dev);
 995         pm_runtime_enable(gpadc->dev);
 996
 997         ab8500_gpadc_read_calibration_data(gpadc);
 998         list_add_tail(&gpadc->node, &ab8500_gpadc_list);
 999         dev_dbg(gpadc->dev, "probe success\n");
1000
1001         return 0;
1002
1003 fail_enable:
1004 fail_irq:
1005         free_irq(gpadc->irq_sw, gpadc);
1006         free_irq(gpadc->irq_hw, gpadc);
1007 fail:
1008         return ret;
1009 }
1010
1011 static int ab8500_gpadc_remove(struct platform_device *pdev)
1012 {
1013         struct ab8500_gpadc *gpadc = platform_get_drvdata(pdev);
1014
1015         /* remove this gpadc entry from the list */
1016         list_del(&gpadc->node);
1017         /* remove interrupt  - completion of Sw ADC conversion */
1018         if (gpadc->irq_sw >= 0)
1019                 free_irq(gpadc->irq_sw, gpadc);
1020         if (gpadc->irq_hw >= 0)
1021                 free_irq(gpadc->irq_hw, gpadc);
1022
1023         pm_runtime_get_sync(gpadc->dev);
1024         pm_runtime_disable(gpadc->dev);
1025
1026         regulator_disable(gpadc->regu);
1027
1028         pm_runtime_set_suspended(gpadc->dev);
1029
1030         pm_runtime_put_noidle(gpadc->dev);
1031
1032         return 0;
1033 }
1034
1035 static const struct dev_pm_ops ab8500_gpadc_pm_ops = {
1036         SET_RUNTIME_PM_OPS(ab8500_gpadc_runtime_suspend,
1037                            ab8500_gpadc_runtime_resume,
1038                            NULL)
1039         SET_SYSTEM_SLEEP_PM_OPS(ab8500_gpadc_suspend,
1040                                 ab8500_gpadc_resume)
1041
1042 };
1043
1044 static struct platform_driver ab8500_gpadc_driver = {
1045         .probe = ab8500_gpadc_probe,
1046         .remove = ab8500_gpadc_remove,
1047         .driver = {
1048                 .name = "ab8500-gpadc",
1049                 .pm = &ab8500_gpadc_pm_ops,
1050         },
1051 };
1052
1053 static int __init ab8500_gpadc_init(void)
1054 {
1055         return platform_driver_register(&ab8500_gpadc_driver);
1056 }
1057
1058 static void __exit ab8500_gpadc_exit(void)
1059 {
1060         platform_driver_unregister(&ab8500_gpadc_driver);
1061 }
1062
1063 /**
1064  * ab8540_gpadc_get_otp() - returns OTP values
1065  *
1066  */
1067 void ab8540_gpadc_get_otp(struct ab8500_gpadc *gpadc,
1068                         u16 *vmain_l, u16 *vmain_h, u16 *btemp_l, u16 *btemp_h,
1069                         u16 *vbat_l, u16 *vbat_h, u16 *ibat_l, u16 *ibat_h)
1070 {
1071         *vmain_l = gpadc->cal_data[ADC_INPUT_VMAIN].otp_calib_lo;
1072         *vmain_h = gpadc->cal_data[ADC_INPUT_VMAIN].otp_calib_hi;
1073         *btemp_l = gpadc->cal_data[ADC_INPUT_BTEMP].otp_calib_lo;
1074         *btemp_h = gpadc->cal_data[ADC_INPUT_BTEMP].otp_calib_hi;
1075         *vbat_l  = gpadc->cal_data[ADC_INPUT_VBAT].otp_calib_lo;
1076         *vbat_h  = gpadc->cal_data[ADC_INPUT_VBAT].otp_calib_hi;
1077         *ibat_l  = gpadc->cal_data[ADC_INPUT_IBAT].otp_calib_lo;
1078         *ibat_h  = gpadc->cal_data[ADC_INPUT_IBAT].otp_calib_hi;
1079 }
1080
1081 subsys_initcall_sync(ab8500_gpadc_init);
1082 module_exit(ab8500_gpadc_exit);
1083
1084 MODULE_LICENSE("GPL v2");
1085 MODULE_AUTHOR("Arun R Murthy");
1086 MODULE_AUTHOR("Daniel Willerud");
1087 MODULE_AUTHOR("Johan Palsson");
1088 MODULE_AUTHOR("M'boumba Cedric Madianga");
1089 MODULE_ALIAS("platform:ab8500_gpadc");
1090 MODULE_DESCRIPTION("AB8500 GPADC driver");