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
  41 /*
  42  * OTP register offsets
  43  * Bank : 0x15
  44  */
  45 #define AB8500_GPADC_CAL_1              0x0F
  46 #define AB8500_GPADC_CAL_2              0x10
  47 #define AB8500_GPADC_CAL_3              0x11
  48 #define AB8500_GPADC_CAL_4              0x12
  49 #define AB8500_GPADC_CAL_5              0x13
  50 #define AB8500_GPADC_CAL_6              0x14
  51 #define AB8500_GPADC_CAL_7              0x15
  52
  53 /* gpadc constants */
  54 #define EN_VINTCORE12                   0x04
  55 #define EN_VTVOUT                       0x02
  56 #define EN_GPADC                        0x01
  57 #define DIS_GPADC                       0x00
  58 #define SW_AVG_16                       0x60
  59 #define ADC_SW_CONV                     0x04
  60 #define EN_ICHAR                        0x80
  61 #define BTEMP_PULL_UP                   0x08
  62 #define EN_BUF                          0x40
  63 #define DIS_ZERO                        0x00
  64 #define GPADC_BUSY                      0x01
  65
  66 /* GPADC constants from AB8500 spec, UM0836 */
  67 #define ADC_RESOLUTION                  1024
  68 #define ADC_CH_BTEMP_MIN                0
  69 #define ADC_CH_BTEMP_MAX                1350
  70 #define ADC_CH_DIETEMP_MIN              0
  71 #define ADC_CH_DIETEMP_MAX              1350
  72 #define ADC_CH_CHG_V_MIN                0
  73 #define ADC_CH_CHG_V_MAX                20030
  74 #define ADC_CH_ACCDET2_MIN              0
  75 #define ADC_CH_ACCDET2_MAX              2500
  76 #define ADC_CH_VBAT_MIN                 2300
  77 #define ADC_CH_VBAT_MAX                 4800
  78 #define ADC_CH_CHG_I_MIN                0
  79 #define ADC_CH_CHG_I_MAX                1500
  80 #define ADC_CH_BKBAT_MIN                0
  81 #define ADC_CH_BKBAT_MAX                3200
  82
  83 /* This is used to not lose precision when dividing to get gain and offset */
  84 #define CALIB_SCALE                     1000
  85
  86 /* Time in ms before disabling regulator */
  87 #define GPADC_AUDOSUSPEND_DELAY         1
  88
  89 #define CONVERSION_TIME                 500 /* ms */
  90
  91 enum cal_channels {
  92         ADC_INPUT_VMAIN = 0,
  93         ADC_INPUT_BTEMP,
  94         ADC_INPUT_VBAT,
  95         NBR_CAL_INPUTS,
  96 };
  97
  98 /**
  99  * struct adc_cal_data - Table for storing gain and offset for the calibrated
 100  * ADC channels
 101  * @gain:               Gain of the ADC channel
 102  * @offset:             Offset of the ADC channel
 103  */
 104 struct adc_cal_data {
 105         u64 gain;
 106         u64 offset;
 107 };
 108
 109 /**
 110  * struct ab8500_gpadc - AB8500 GPADC device information
 111  * @dev:                        pointer to the struct device
 112  * @node:                       a list of AB8500 GPADCs, hence prepared for
 113                                 reentrance
 114  * @parent:                     pointer to the struct ab8500
 115  * @ab8500_gpadc_complete:      pointer to the struct completion, to indicate
 116  *                              the completion of gpadc conversion
 117  * @ab8500_gpadc_lock:          structure of type mutex
 118  * @regu:                       pointer to the struct regulator
 119  * @irq:                        interrupt number that is used by gpadc
 120  * @cal_data                    array of ADC calibration data structs
 121  */
 122 struct ab8500_gpadc {
 123         struct device *dev;
 124         struct list_head node;
 125         struct ab8500 *parent;
 126         struct completion ab8500_gpadc_complete;
 127         struct mutex ab8500_gpadc_lock;
 128         struct regulator *regu;
 129         int irq;
 130         struct adc_cal_data cal_data[NBR_CAL_INPUTS];
 131 };
 132
 133 static LIST_HEAD(ab8500_gpadc_list);
 134
 135 /**
 136  * ab8500_gpadc_get() - returns a reference to the primary AB8500 GPADC
 137  * (i.e. the first GPADC in the instance list)
 138  */
 139 struct ab8500_gpadc *ab8500_gpadc_get(char *name)
 140 {
 141         struct ab8500_gpadc *gpadc;
 142
 143         list_for_each_entry(gpadc, &ab8500_gpadc_list, node) {
 144                 if (!strcmp(name, dev_name(gpadc->dev)))
 145                     return gpadc;
 146         }
 147
 148         return ERR_PTR(-ENOENT);
 149 }
 150 EXPORT_SYMBOL(ab8500_gpadc_get);
 151
 152 /**
 153  * ab8500_gpadc_ad_to_voltage() - Convert a raw ADC value to a voltage
 154  */
 155 int ab8500_gpadc_ad_to_voltage(struct ab8500_gpadc *gpadc, u8 channel,
 156         int ad_value)
 157 {
 158         int res;
 159
 160         switch (channel) {
 161         case MAIN_CHARGER_V:
 162                 /* For some reason we don't have calibrated data */
 163                 if (!gpadc->cal_data[ADC_INPUT_VMAIN].gain) {
 164                         res = ADC_CH_CHG_V_MIN + (ADC_CH_CHG_V_MAX -
 165                                 ADC_CH_CHG_V_MIN) * ad_value /
 166                                 ADC_RESOLUTION;
 167                         break;
 168                 }
 169                 /* Here we can use the calibrated data */
 170                 res = (int) (ad_value * gpadc->cal_data[ADC_INPUT_VMAIN].gain +
 171                         gpadc->cal_data[ADC_INPUT_VMAIN].offset) / CALIB_SCALE;
 172                 break;
 173
 174         case BAT_CTRL:
 175         case BTEMP_BALL:
 176         case ACC_DETECT1:
 177         case ADC_AUX1:
 178         case ADC_AUX2:
 179                 /* For some reason we don't have calibrated data */
 180                 if (!gpadc->cal_data[ADC_INPUT_BTEMP].gain) {
 181                         res = ADC_CH_BTEMP_MIN + (ADC_CH_BTEMP_MAX -
 182                                 ADC_CH_BTEMP_MIN) * ad_value /
 183                                 ADC_RESOLUTION;
 184                         break;
 185                 }
 186                 /* Here we can use the calibrated data */
 187                 res = (int) (ad_value * gpadc->cal_data[ADC_INPUT_BTEMP].gain +
 188                         gpadc->cal_data[ADC_INPUT_BTEMP].offset) / CALIB_SCALE;
 189                 break;
 190
 191         case MAIN_BAT_V:
 192                 /* For some reason we don't have calibrated data */
 193                 if (!gpadc->cal_data[ADC_INPUT_VBAT].gain) {
 194                         res = ADC_CH_VBAT_MIN + (ADC_CH_VBAT_MAX -
 195                                 ADC_CH_VBAT_MIN) * ad_value /
 196                                 ADC_RESOLUTION;
 197                         break;
 198                 }
 199                 /* Here we can use the calibrated data */
 200                 res = (int) (ad_value * gpadc->cal_data[ADC_INPUT_VBAT].gain +
 201                         gpadc->cal_data[ADC_INPUT_VBAT].offset) / CALIB_SCALE;
 202                 break;
 203
 204         case DIE_TEMP:
 205                 res = ADC_CH_DIETEMP_MIN +
 206                         (ADC_CH_DIETEMP_MAX - ADC_CH_DIETEMP_MIN) * ad_value /
 207                         ADC_RESOLUTION;
 208                 break;
 209
 210         case ACC_DETECT2:
 211                 res = ADC_CH_ACCDET2_MIN +
 212                         (ADC_CH_ACCDET2_MAX - ADC_CH_ACCDET2_MIN) * ad_value /
 213                         ADC_RESOLUTION;
 214                 break;
 215
 216         case VBUS_V:
 217                 res = ADC_CH_CHG_V_MIN +
 218                         (ADC_CH_CHG_V_MAX - ADC_CH_CHG_V_MIN) * ad_value /
 219                         ADC_RESOLUTION;
 220                 break;
 221
 222         case MAIN_CHARGER_C:
 223         case USB_CHARGER_C:
 224                 res = ADC_CH_CHG_I_MIN +
 225                         (ADC_CH_CHG_I_MAX - ADC_CH_CHG_I_MIN) * ad_value /
 226                         ADC_RESOLUTION;
 227                 break;
 228
 229         case BK_BAT_V:
 230                 res = ADC_CH_BKBAT_MIN +
 231                         (ADC_CH_BKBAT_MAX - ADC_CH_BKBAT_MIN) * ad_value /
 232                         ADC_RESOLUTION;
 233                 break;
 234
 235         default:
 236                 dev_err(gpadc->dev,
 237                         "unknown channel, not possible to convert\n");
 238                 res = -EINVAL;
 239                 break;
 240
 241         }
 242         return res;
 243 }
 244 EXPORT_SYMBOL(ab8500_gpadc_ad_to_voltage);
 245
 246 /**
 247  * ab8500_gpadc_convert() - gpadc conversion
 248  * @channel:    analog channel to be converted to digital data
 249  *
 250  * This function converts the selected analog i/p to digital
 251  * data.
 252  */
 253 int ab8500_gpadc_convert(struct ab8500_gpadc *gpadc, u8 channel)
 254 {
 255         int ad_value;
 256         int voltage;
 257
 258         ad_value = ab8500_gpadc_read_raw(gpadc, channel);
 259         if (ad_value < 0) {
 260                 dev_err(gpadc->dev, "GPADC raw value failed ch: %d\n", channel);
 261                 return ad_value;
 262         }
 263
 264         voltage = ab8500_gpadc_ad_to_voltage(gpadc, channel, ad_value);
 265
 266         if (voltage < 0)
 267                 dev_err(gpadc->dev, "GPADC to voltage conversion failed ch:"
 268                         " %d AD: 0x%x\n", channel, ad_value);
 269
 270         return voltage;
 271 }
 272 EXPORT_SYMBOL(ab8500_gpadc_convert);
 273
 274 /**
 275  * ab8500_gpadc_read_raw() - gpadc read
 276  * @channel:    analog channel to be read
 277  *
 278  * This function obtains the raw ADC value, this then needs
 279  * to be converted by calling ab8500_gpadc_ad_to_voltage()
 280  */
 281 int ab8500_gpadc_read_raw(struct ab8500_gpadc *gpadc, u8 channel)
 282 {
 283         int ret;
 284         int looplimit = 0;
 285         u8 val, low_data, high_data;
 286
 287         if (!gpadc)
 288                 return -ENODEV;
 289
 290         mutex_lock(&gpadc->ab8500_gpadc_lock);
 291
 292         /* Enable VTVout LDO this is required for GPADC */
 293         pm_runtime_get_sync(gpadc->dev);
 294
 295         /* Check if ADC is not busy, lock and proceed */
 296         do {
 297                 ret = abx500_get_register_interruptible(gpadc->dev,
 298                         AB8500_GPADC, AB8500_GPADC_STAT_REG, &val);
 299                 if (ret < 0)
 300                         goto out;
 301                 if (!(val & GPADC_BUSY))
 302                         break;
 303                 msleep(10);
 304         } while (++looplimit < 10);
 305         if (looplimit >= 10 && (val & GPADC_BUSY)) {
 306                 dev_err(gpadc->dev, "gpadc_conversion: GPADC busy");
 307                 ret = -EINVAL;
 308                 goto out;
 309         }
 310
 311         /* Enable GPADC */
 312         ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
 313                 AB8500_GPADC, AB8500_GPADC_CTRL1_REG, EN_GPADC, EN_GPADC);
 314         if (ret < 0) {
 315                 dev_err(gpadc->dev, "gpadc_conversion: enable gpadc failed\n");
 316                 goto out;
 317         }
 318
 319         /* Select the channel source and set average samples to 16 */
 320         ret = abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
 321                 AB8500_GPADC_CTRL2_REG, (channel | SW_AVG_16));
 322         if (ret < 0) {
 323                 dev_err(gpadc->dev,
 324                         "gpadc_conversion: set avg samples failed\n");
 325                 goto out;
 326         }
 327
 328         /*
 329          * Enable ADC, buffering, select rising edge and enable ADC path
 330          * charging current sense if it needed, ABB 3.0 needs some special
 331          * treatment too.
 332          */
 333         switch (channel) {
 334         case MAIN_CHARGER_C:
 335         case USB_CHARGER_C:
 336                 ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
 337                         AB8500_GPADC, AB8500_GPADC_CTRL1_REG,
 338                         EN_BUF | EN_ICHAR,
 339                         EN_BUF | EN_ICHAR);
 340                 break;
 341         case BTEMP_BALL:
 342                 if (!is_ab8500_2p0_or_earlier(gpadc->parent)) {
 343                         /* Turn on btemp pull-up on ABB 3.0 */
 344                         ret = abx500_mask_and_set_register_interruptible(
 345                                 gpadc->dev,
 346                                 AB8500_GPADC, AB8500_GPADC_CTRL1_REG,
 347                                 EN_BUF | BTEMP_PULL_UP,
 348                                 EN_BUF | BTEMP_PULL_UP);
 349
 350                  /*
 351                   * Delay might be needed for ABB8500 cut 3.0, if not, remove
 352                   * when hardware will be available
 353                   */
 354                         usleep_range(1000, 1000);
 355                         break;
 356                 }
 357                 /* Intentional fallthrough */
 358         default:
 359                 ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
 360                         AB8500_GPADC, AB8500_GPADC_CTRL1_REG, EN_BUF, EN_BUF);
 361                 break;
 362         }
 363         if (ret < 0) {
 364                 dev_err(gpadc->dev,
 365                         "gpadc_conversion: select falling edge failed\n");
 366                 goto out;
 367         }
 368
 369         ret = abx500_mask_and_set_register_interruptible(gpadc->dev,
 370                 AB8500_GPADC, AB8500_GPADC_CTRL1_REG, ADC_SW_CONV, ADC_SW_CONV);
 371         if (ret < 0) {
 372                 dev_err(gpadc->dev,
 373                         "gpadc_conversion: start s/w conversion failed\n");
 374                 goto out;
 375         }
 376         /* wait for completion of conversion */
 377         if (!wait_for_completion_timeout(&gpadc->ab8500_gpadc_complete,
 378                                          msecs_to_jiffies(CONVERSION_TIME))) {
 379                 dev_err(gpadc->dev,
 380                         "timeout: didn't receive GPADC conversion interrupt\n");
 381                 ret = -EINVAL;
 382                 goto out;
 383         }
 384
 385         /* Read the converted RAW data */
 386         ret = abx500_get_register_interruptible(gpadc->dev, AB8500_GPADC,
 387                 AB8500_GPADC_MANDATAL_REG, &low_data);
 388         if (ret < 0) {
 389                 dev_err(gpadc->dev, "gpadc_conversion: read low data failed\n");
 390                 goto out;
 391         }
 392
 393         ret = abx500_get_register_interruptible(gpadc->dev, AB8500_GPADC,
 394                 AB8500_GPADC_MANDATAH_REG, &high_data);
 395         if (ret < 0) {
 396                 dev_err(gpadc->dev,
 397                         "gpadc_conversion: read high data failed\n");
 398                 goto out;
 399         }
 400
 401         /* Disable GPADC */
 402         ret = abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
 403                 AB8500_GPADC_CTRL1_REG, DIS_GPADC);
 404         if (ret < 0) {
 405                 dev_err(gpadc->dev, "gpadc_conversion: disable gpadc failed\n");
 406                 goto out;
 407         }
 408
 409         pm_runtime_mark_last_busy(gpadc->dev);
 410         pm_runtime_put_autosuspend(gpadc->dev);
 411
 412         mutex_unlock(&gpadc->ab8500_gpadc_lock);
 413
 414         return (high_data << 8) | low_data;
 415
 416 out:
 417         /*
 418          * It has shown to be needed to turn off the GPADC if an error occurs,
 419          * otherwise we might have problem when waiting for the busy bit in the
 420          * GPADC status register to go low. In V1.1 there wait_for_completion
 421          * seems to timeout when waiting for an interrupt.. Not seen in V2.0
 422          */
 423         (void) abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC,
 424                 AB8500_GPADC_CTRL1_REG, DIS_GPADC);
 425
 426         pm_runtime_put(gpadc->dev);
 427
 428         mutex_unlock(&gpadc->ab8500_gpadc_lock);
 429         dev_err(gpadc->dev,
 430                 "gpadc_conversion: Failed to AD convert channel %d\n", channel);
 431         return ret;
 432 }
 433 EXPORT_SYMBOL(ab8500_gpadc_read_raw);
 434
 435 /**
 436  * ab8500_bm_gpswadcconvend_handler() - isr for s/w gpadc conversion completion
 437  * @irq:        irq number
 438  * @data:       pointer to the data passed during request irq
 439  *
 440  * This is a interrupt service routine for s/w gpadc conversion completion.
 441  * Notifies the gpadc completion is completed and the converted raw value
 442  * can be read from the registers.
 443  * Returns IRQ status(IRQ_HANDLED)
 444  */
 445 static irqreturn_t ab8500_bm_gpswadcconvend_handler(int irq, void *_gpadc)
 446 {
 447         struct ab8500_gpadc *gpadc = _gpadc;
 448
 449         complete(&gpadc->ab8500_gpadc_complete);
 450
 451         return IRQ_HANDLED;
 452 }
 453
 454 static int otp_cal_regs[] = {
 455         AB8500_GPADC_CAL_1,
 456         AB8500_GPADC_CAL_2,
 457         AB8500_GPADC_CAL_3,
 458         AB8500_GPADC_CAL_4,
 459         AB8500_GPADC_CAL_5,
 460         AB8500_GPADC_CAL_6,
 461         AB8500_GPADC_CAL_7,
 462 };
 463
 464 static void ab8500_gpadc_read_calibration_data(struct ab8500_gpadc *gpadc)
 465 {
 466         int i;
 467         int ret[ARRAY_SIZE(otp_cal_regs)];
 468         u8 gpadc_cal[ARRAY_SIZE(otp_cal_regs)];
 469
 470         int vmain_high, vmain_low;
 471         int btemp_high, btemp_low;
 472         int vbat_high, vbat_low;
 473
 474         /* First we read all OTP registers and store the error code */
 475         for (i = 0; i < ARRAY_SIZE(otp_cal_regs); i++) {
 476                 ret[i] = abx500_get_register_interruptible(gpadc->dev,
 477                         AB8500_OTP_EMUL, otp_cal_regs[i],  &gpadc_cal[i]);
 478                 if (ret[i] < 0)
 479                         dev_err(gpadc->dev, "%s: read otp reg 0x%02x failed\n",
 480                                 __func__, otp_cal_regs[i]);
 481         }
 482
 483         /*
 484          * The ADC calibration data is stored in OTP registers.
 485          * The layout of the calibration data is outlined below and a more
 486          * detailed description can be found in UM0836
 487          *
 488          * vm_h/l = vmain_high/low
 489          * bt_h/l = btemp_high/low
 490          * vb_h/l = vbat_high/low
 491          *
 492          * Data bits:
 493          * | 7     | 6     | 5     | 4     | 3     | 2     | 1     | 0
 494          * |.......|.......|.......|.......|.......|.......|.......|.......
 495          * |                                               | vm_h9 | vm_h8
 496          * |.......|.......|.......|.......|.......|.......|.......|.......
 497          * |               | vm_h7 | vm_h6 | vm_h5 | vm_h4 | vm_h3 | vm_h2
 498          * |.......|.......|.......|.......|.......|.......|.......|.......
 499          * | vm_h1 | vm_h0 | vm_l4 | vm_l3 | vm_l2 | vm_l1 | vm_l0 | bt_h9
 500          * |.......|.......|.......|.......|.......|.......|.......|.......
 501          * | bt_h8 | bt_h7 | bt_h6 | bt_h5 | bt_h4 | bt_h3 | bt_h2 | bt_h1
 502          * |.......|.......|.......|.......|.......|.......|.......|.......
 503          * | bt_h0 | bt_l4 | bt_l3 | bt_l2 | bt_l1 | bt_l0 | vb_h9 | vb_h8
 504          * |.......|.......|.......|.......|.......|.......|.......|.......
 505          * | vb_h7 | vb_h6 | vb_h5 | vb_h4 | vb_h3 | vb_h2 | vb_h1 | vb_h0
 506          * |.......|.......|.......|.......|.......|.......|.......|.......
 507          * | vb_l5 | vb_l4 | vb_l3 | vb_l2 | vb_l1 | vb_l0 |
 508          * |.......|.......|.......|.......|.......|.......|.......|.......
 509          *
 510          *
 511          * Ideal output ADC codes corresponding to injected input voltages
 512          * during manufacturing is:
 513          *
 514          * vmain_high: Vin = 19500mV / ADC ideal code = 997
 515          * vmain_low:  Vin = 315mV   / ADC ideal code = 16
 516          * btemp_high: Vin = 1300mV  / ADC ideal code = 985
 517          * btemp_low:  Vin = 21mV    / ADC ideal code = 16
 518          * vbat_high:  Vin = 4700mV  / ADC ideal code = 982
 519          * vbat_low:   Vin = 2380mV  / ADC ideal code = 33
 520          */
 521
 522         /* Calculate gain and offset for VMAIN if all reads succeeded */
 523         if (!(ret[0] < 0 || ret[1] < 0 || ret[2] < 0)) {
 524                 vmain_high = (((gpadc_cal[0] & 0x03) << 8) |
 525                         ((gpadc_cal[1] & 0x3F) << 2) |
 526                         ((gpadc_cal[2] & 0xC0) >> 6));
 527
 528                 vmain_low = ((gpadc_cal[2] & 0x3E) >> 1);
 529
 530                 gpadc->cal_data[ADC_INPUT_VMAIN].gain = CALIB_SCALE *
 531                         (19500 - 315) / (vmain_high - vmain_low);
 532
 533                 gpadc->cal_data[ADC_INPUT_VMAIN].offset = CALIB_SCALE * 19500 -
 534                         (CALIB_SCALE * (19500 - 315) /
 535                          (vmain_high - vmain_low)) * vmain_high;
 536         } else {
 537                 gpadc->cal_data[ADC_INPUT_VMAIN].gain = 0;
 538         }
 539
 540         /* Calculate gain and offset for BTEMP if all reads succeeded */
 541         if (!(ret[2] < 0 || ret[3] < 0 || ret[4] < 0)) {
 542                 btemp_high = (((gpadc_cal[2] & 0x01) << 9) |
 543                         (gpadc_cal[3] << 1) |
 544                         ((gpadc_cal[4] & 0x80) >> 7));
 545
 546                 btemp_low = ((gpadc_cal[4] & 0x7C) >> 2);
 547
 548                 gpadc->cal_data[ADC_INPUT_BTEMP].gain =
 549                         CALIB_SCALE * (1300 - 21) / (btemp_high - btemp_low);
 550
 551                 gpadc->cal_data[ADC_INPUT_BTEMP].offset = CALIB_SCALE * 1300 -
 552                         (CALIB_SCALE * (1300 - 21) /
 553                         (btemp_high - btemp_low)) * btemp_high;
 554         } else {
 555                 gpadc->cal_data[ADC_INPUT_BTEMP].gain = 0;
 556         }
 557
 558         /* Calculate gain and offset for VBAT if all reads succeeded */
 559         if (!(ret[4] < 0 || ret[5] < 0 || ret[6] < 0)) {
 560                 vbat_high = (((gpadc_cal[4] & 0x03) << 8) | gpadc_cal[5]);
 561                 vbat_low = ((gpadc_cal[6] & 0xFC) >> 2);
 562
 563                 gpadc->cal_data[ADC_INPUT_VBAT].gain = CALIB_SCALE *
 564                         (4700 - 2380) / (vbat_high - vbat_low);
 565
 566                 gpadc->cal_data[ADC_INPUT_VBAT].offset = CALIB_SCALE * 4700 -
 567                         (CALIB_SCALE * (4700 - 2380) /
 568                         (vbat_high - vbat_low)) * vbat_high;
 569         } else {
 570                 gpadc->cal_data[ADC_INPUT_VBAT].gain = 0;
 571         }
 572
 573         dev_dbg(gpadc->dev, "VMAIN gain %llu offset %llu\n",
 574                 gpadc->cal_data[ADC_INPUT_VMAIN].gain,
 575                 gpadc->cal_data[ADC_INPUT_VMAIN].offset);
 576
 577         dev_dbg(gpadc->dev, "BTEMP gain %llu offset %llu\n",
 578                 gpadc->cal_data[ADC_INPUT_BTEMP].gain,
 579                 gpadc->cal_data[ADC_INPUT_BTEMP].offset);
 580
 581         dev_dbg(gpadc->dev, "VBAT gain %llu offset %llu\n",
 582                 gpadc->cal_data[ADC_INPUT_VBAT].gain,
 583                 gpadc->cal_data[ADC_INPUT_VBAT].offset);
 584 }
 585
 586 static int ab8500_gpadc_runtime_suspend(struct device *dev)
 587 {
 588         struct ab8500_gpadc *gpadc = dev_get_drvdata(dev);
 589
 590         regulator_disable(gpadc->regu);
 591         return 0;
 592 }
 593
 594 static int ab8500_gpadc_runtime_resume(struct device *dev)
 595 {
 596         struct ab8500_gpadc *gpadc = dev_get_drvdata(dev);
 597         int ret;
 598
 599         ret = regulator_enable(gpadc->regu);
 600         if (ret)
 601                 dev_err(dev, "Failed to enable vtvout LDO: %d\n", ret);
 602         return ret;
 603 }
 604
 605 static int ab8500_gpadc_runtime_idle(struct device *dev)
 606 {
 607         pm_runtime_suspend(dev);
 608         return 0;
 609 }
 610
 611 static int ab8500_gpadc_probe(struct platform_device *pdev)
 612 {
 613         int ret = 0;
 614         struct ab8500_gpadc *gpadc;
 615
 616         gpadc = kzalloc(sizeof(struct ab8500_gpadc), GFP_KERNEL);
 617         if (!gpadc) {
 618                 dev_err(&pdev->dev, "Error: No memory\n");
 619                 return -ENOMEM;
 620         }
 621
 622         gpadc->irq = platform_get_irq_byname(pdev, "SW_CONV_END");
 623         if (gpadc->irq < 0) {
 624                 dev_err(&pdev->dev, "failed to get platform irq-%d\n",
 625                         gpadc->irq);
 626                 ret = gpadc->irq;
 627                 goto fail;
 628         }
 629
 630         gpadc->dev = &pdev->dev;
 631         gpadc->parent = dev_get_drvdata(pdev->dev.parent);
 632         mutex_init(&gpadc->ab8500_gpadc_lock);
 633
 634         /* Initialize completion used to notify completion of conversion */
 635         init_completion(&gpadc->ab8500_gpadc_complete);
 636
 637         /* Register interrupt  - SwAdcComplete */
 638         ret = request_threaded_irq(gpadc->irq, NULL,
 639                 ab8500_bm_gpswadcconvend_handler,
 640                 IRQF_ONESHOT | IRQF_NO_SUSPEND | IRQF_SHARED,
 641                                 "ab8500-gpadc", gpadc);
 642         if (ret < 0) {
 643                 dev_err(gpadc->dev, "Failed to register interrupt, irq: %d\n",
 644                         gpadc->irq);
 645                 goto fail;
 646         }
 647
 648         /* VTVout LDO used to power up ab8500-GPADC */
 649         gpadc->regu = devm_regulator_get(&pdev->dev, "vddadc");
 650         if (IS_ERR(gpadc->regu)) {
 651                 ret = PTR_ERR(gpadc->regu);
 652                 dev_err(gpadc->dev, "failed to get vtvout LDO\n");
 653                 goto fail_irq;
 654         }
 655
 656         platform_set_drvdata(pdev, gpadc);
 657
 658         ret = regulator_enable(gpadc->regu);
 659         if (ret) {
 660                 dev_err(gpadc->dev, "Failed to enable vtvout LDO: %d\n", ret);
 661                 goto fail_enable;
 662         }
 663
 664         pm_runtime_set_autosuspend_delay(gpadc->dev, GPADC_AUDOSUSPEND_DELAY);
 665         pm_runtime_use_autosuspend(gpadc->dev);
 666         pm_runtime_set_active(gpadc->dev);
 667         pm_runtime_enable(gpadc->dev);
 668
 669         ab8500_gpadc_read_calibration_data(gpadc);
 670         list_add_tail(&gpadc->node, &ab8500_gpadc_list);
 671         dev_dbg(gpadc->dev, "probe success\n");
 672         return 0;
 673
 674 fail_enable:
 675 fail_irq:
 676         free_irq(gpadc->irq, gpadc);
 677 fail:
 678         kfree(gpadc);
 679         gpadc = NULL;
 680         return ret;
 681 }
 682
 683 static int ab8500_gpadc_remove(struct platform_device *pdev)
 684 {
 685         struct ab8500_gpadc *gpadc = platform_get_drvdata(pdev);
 686
 687         /* remove this gpadc entry from the list */
 688         list_del(&gpadc->node);
 689         /* remove interrupt  - completion of Sw ADC conversion */
 690         free_irq(gpadc->irq, gpadc);
 691
 692         pm_runtime_get_sync(gpadc->dev);
 693         pm_runtime_disable(gpadc->dev);
 694
 695         regulator_disable(gpadc->regu);
 696
 697         pm_runtime_set_suspended(gpadc->dev);
 698
 699         pm_runtime_put_noidle(gpadc->dev);
 700
 701         kfree(gpadc);
 702         gpadc = NULL;
 703         return 0;
 704 }
 705
 706 static const struct dev_pm_ops ab8500_gpadc_pm_ops = {
 707         SET_RUNTIME_PM_OPS(ab8500_gpadc_runtime_suspend,
 708                            ab8500_gpadc_runtime_resume,
 709                            ab8500_gpadc_runtime_idle)
 710 };
 711
 712 static struct platform_driver ab8500_gpadc_driver = {
 713         .probe = ab8500_gpadc_probe,
 714         .remove = ab8500_gpadc_remove,
 715         .driver = {
 716                 .name = "ab8500-gpadc",
 717                 .owner = THIS_MODULE,
 718                 .pm = &ab8500_gpadc_pm_ops,
 719         },
 720 };
 721
 722 static int __init ab8500_gpadc_init(void)
 723 {
 724         return platform_driver_register(&ab8500_gpadc_driver);
 725 }
 726
 727 static void __exit ab8500_gpadc_exit(void)
 728 {
 729         platform_driver_unregister(&ab8500_gpadc_driver);
 730 }
 731
 732 subsys_initcall_sync(ab8500_gpadc_init);
 733 module_exit(ab8500_gpadc_exit);
 734
 735 MODULE_LICENSE("GPL v2");
 736 MODULE_AUTHOR("Arun R Murthy, Daniel Willerud, Johan Palsson");
 737 MODULE_ALIAS("platform:ab8500_gpadc");
 738 MODULE_DESCRIPTION("AB8500 GPADC driver");