1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) ST-Ericsson SA 2010 4 * 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 * Author: M'boumba Cedric Madianga 9 * Author: Linus Walleij <linus.walleij@linaro.org> 10 * 11 * AB8500 General Purpose ADC driver. The AB8500 uses reference voltages: 12 * VinVADC, and VADC relative to GND to do its job. It monitors main and backup 13 * battery voltages, AC (mains) voltage, USB cable voltage, as well as voltages 14 * representing the temperature of the chip die and battery, accessory 15 * detection by resistance measurements using relative voltages and GSM burst 16 * information. 17 * 18 * Some of the voltages are measured on external pins on the IC, such as 19 * battery temperature or "ADC aux" 1 and 2. Other voltages are internal rails 20 * from other parts of the ASIC such as main charger voltage, main and battery 21 * backup voltage or USB VBUS voltage. For this reason drivers for other 22 * parts of the system are required to obtain handles to the ADC to do work 23 * for them and the IIO driver provides arbitration among these consumers. 24 */ 25 #include <linux/init.h> 26 #include <linux/bits.h> 27 #include <linux/iio/iio.h> 28 #include <linux/iio/sysfs.h> 29 #include <linux/device.h> 30 #include <linux/interrupt.h> 31 #include <linux/spinlock.h> 32 #include <linux/delay.h> 33 #include <linux/pm_runtime.h> 34 #include <linux/platform_device.h> 35 #include <linux/completion.h> 36 #include <linux/regulator/consumer.h> 37 #include <linux/random.h> 38 #include <linux/err.h> 39 #include <linux/slab.h> 40 #include <linux/mfd/abx500.h> 41 #include <linux/mfd/abx500/ab8500.h> 42 43 /* GPADC register offsets and bit definitions */ 44 45 #define AB8500_GPADC_CTRL1_REG 0x00 46 /* GPADC control register 1 bits */ 47 #define AB8500_GPADC_CTRL1_DISABLE 0x00 48 #define AB8500_GPADC_CTRL1_ENABLE BIT(0) 49 #define AB8500_GPADC_CTRL1_TRIG_ENA BIT(1) 50 #define AB8500_GPADC_CTRL1_START_SW_CONV BIT(2) 51 #define AB8500_GPADC_CTRL1_BTEMP_PULL_UP BIT(3) 52 /* 0 = use rising edge, 1 = use falling edge */ 53 #define AB8500_GPADC_CTRL1_TRIG_EDGE BIT(4) 54 /* 0 = use VTVOUT, 1 = use VRTC as pull-up supply for battery temp NTC */ 55 #define AB8500_GPADC_CTRL1_PUPSUPSEL BIT(5) 56 #define AB8500_GPADC_CTRL1_BUF_ENA BIT(6) 57 #define AB8500_GPADC_CTRL1_ICHAR_ENA BIT(7) 58 59 #define AB8500_GPADC_CTRL2_REG 0x01 60 #define AB8500_GPADC_CTRL3_REG 0x02 61 /* 62 * GPADC control register 2 and 3 bits 63 * the bit layout is the same for SW and HW conversion set-up 64 */ 65 #define AB8500_GPADC_CTRL2_AVG_1 0x00 66 #define AB8500_GPADC_CTRL2_AVG_4 BIT(5) 67 #define AB8500_GPADC_CTRL2_AVG_8 BIT(6) 68 #define AB8500_GPADC_CTRL2_AVG_16 (BIT(5) | BIT(6)) 69 70 enum ab8500_gpadc_channel { 71 AB8500_GPADC_CHAN_UNUSED = 0x00, 72 AB8500_GPADC_CHAN_BAT_CTRL = 0x01, 73 AB8500_GPADC_CHAN_BAT_TEMP = 0x02, 74 /* This is not used on AB8505 */ 75 AB8500_GPADC_CHAN_MAIN_CHARGER = 0x03, 76 AB8500_GPADC_CHAN_ACC_DET_1 = 0x04, 77 AB8500_GPADC_CHAN_ACC_DET_2 = 0x05, 78 AB8500_GPADC_CHAN_ADC_AUX_1 = 0x06, 79 AB8500_GPADC_CHAN_ADC_AUX_2 = 0x07, 80 AB8500_GPADC_CHAN_VBAT_A = 0x08, 81 AB8500_GPADC_CHAN_VBUS = 0x09, 82 AB8500_GPADC_CHAN_MAIN_CHARGER_CURRENT = 0x0a, 83 AB8500_GPADC_CHAN_USB_CHARGER_CURRENT = 0x0b, 84 AB8500_GPADC_CHAN_BACKUP_BAT = 0x0c, 85 /* Only on AB8505 */ 86 AB8505_GPADC_CHAN_DIE_TEMP = 0x0d, 87 AB8500_GPADC_CHAN_ID = 0x0e, 88 AB8500_GPADC_CHAN_INTERNAL_TEST_1 = 0x0f, 89 AB8500_GPADC_CHAN_INTERNAL_TEST_2 = 0x10, 90 AB8500_GPADC_CHAN_INTERNAL_TEST_3 = 0x11, 91 /* FIXME: Applicable to all ASIC variants? */ 92 AB8500_GPADC_CHAN_XTAL_TEMP = 0x12, 93 AB8500_GPADC_CHAN_VBAT_TRUE_MEAS = 0x13, 94 /* FIXME: Doesn't seem to work with pure AB8500 */ 95 AB8500_GPADC_CHAN_BAT_CTRL_AND_IBAT = 0x1c, 96 AB8500_GPADC_CHAN_VBAT_MEAS_AND_IBAT = 0x1d, 97 AB8500_GPADC_CHAN_VBAT_TRUE_MEAS_AND_IBAT = 0x1e, 98 AB8500_GPADC_CHAN_BAT_TEMP_AND_IBAT = 0x1f, 99 /* 100 * Virtual channel used only for ibat conversion to ampere. 101 * Battery current conversion (ibat) cannot be requested as a 102 * single conversion but it is always requested in combination 103 * with other input requests. 104 */ 105 AB8500_GPADC_CHAN_IBAT_VIRTUAL = 0xFF, 106 }; 107 108 #define AB8500_GPADC_AUTO_TIMER_REG 0x03 109 110 #define AB8500_GPADC_STAT_REG 0x04 111 #define AB8500_GPADC_STAT_BUSY BIT(0) 112 113 #define AB8500_GPADC_MANDATAL_REG 0x05 114 #define AB8500_GPADC_MANDATAH_REG 0x06 115 #define AB8500_GPADC_AUTODATAL_REG 0x07 116 #define AB8500_GPADC_AUTODATAH_REG 0x08 117 #define AB8500_GPADC_MUX_CTRL_REG 0x09 118 #define AB8540_GPADC_MANDATA2L_REG 0x09 119 #define AB8540_GPADC_MANDATA2H_REG 0x0A 120 #define AB8540_GPADC_APEAAX_REG 0x10 121 #define AB8540_GPADC_APEAAT_REG 0x11 122 #define AB8540_GPADC_APEAAM_REG 0x12 123 #define AB8540_GPADC_APEAAH_REG 0x13 124 #define AB8540_GPADC_APEAAL_REG 0x14 125 126 /* 127 * OTP register offsets 128 * Bank : 0x15 129 */ 130 #define AB8500_GPADC_CAL_1 0x0F 131 #define AB8500_GPADC_CAL_2 0x10 132 #define AB8500_GPADC_CAL_3 0x11 133 #define AB8500_GPADC_CAL_4 0x12 134 #define AB8500_GPADC_CAL_5 0x13 135 #define AB8500_GPADC_CAL_6 0x14 136 #define AB8500_GPADC_CAL_7 0x15 137 /* New calibration for 8540 */ 138 #define AB8540_GPADC_OTP4_REG_7 0x38 139 #define AB8540_GPADC_OTP4_REG_6 0x39 140 #define AB8540_GPADC_OTP4_REG_5 0x3A 141 142 #define AB8540_GPADC_DIS_ZERO 0x00 143 #define AB8540_GPADC_EN_VBIAS_XTAL_TEMP 0x02 144 145 /* GPADC constants from AB8500 spec, UM0836 */ 146 #define AB8500_ADC_RESOLUTION 1024 147 #define AB8500_ADC_CH_BTEMP_MIN 0 148 #define AB8500_ADC_CH_BTEMP_MAX 1350 149 #define AB8500_ADC_CH_DIETEMP_MIN 0 150 #define AB8500_ADC_CH_DIETEMP_MAX 1350 151 #define AB8500_ADC_CH_CHG_V_MIN 0 152 #define AB8500_ADC_CH_CHG_V_MAX 20030 153 #define AB8500_ADC_CH_ACCDET2_MIN 0 154 #define AB8500_ADC_CH_ACCDET2_MAX 2500 155 #define AB8500_ADC_CH_VBAT_MIN 2300 156 #define AB8500_ADC_CH_VBAT_MAX 4800 157 #define AB8500_ADC_CH_CHG_I_MIN 0 158 #define AB8500_ADC_CH_CHG_I_MAX 1500 159 #define AB8500_ADC_CH_BKBAT_MIN 0 160 #define AB8500_ADC_CH_BKBAT_MAX 3200 161 162 /* GPADC constants from AB8540 spec */ 163 #define AB8500_ADC_CH_IBAT_MIN (-6000) /* mA range measured by ADC for ibat */ 164 #define AB8500_ADC_CH_IBAT_MAX 6000 165 #define AB8500_ADC_CH_IBAT_MIN_V (-60) /* mV range measured by ADC for ibat */ 166 #define AB8500_ADC_CH_IBAT_MAX_V 60 167 #define AB8500_GPADC_IBAT_VDROP_L (-56) /* mV */ 168 #define AB8500_GPADC_IBAT_VDROP_H 56 169 170 /* This is used to not lose precision when dividing to get gain and offset */ 171 #define AB8500_GPADC_CALIB_SCALE 1000 172 /* 173 * Number of bits shift used to not lose precision 174 * when dividing to get ibat gain. 175 */ 176 #define AB8500_GPADC_CALIB_SHIFT_IBAT 20 177 178 /* Time in ms before disabling regulator */ 179 #define AB8500_GPADC_AUTOSUSPEND_DELAY 1 180 181 #define AB8500_GPADC_CONVERSION_TIME 500 /* ms */ 182 183 enum ab8500_cal_channels { 184 AB8500_CAL_VMAIN = 0, 185 AB8500_CAL_BTEMP, 186 AB8500_CAL_VBAT, 187 AB8500_CAL_IBAT, 188 AB8500_CAL_NR, 189 }; 190 191 /** 192 * struct ab8500_adc_cal_data - Table for storing gain and offset for the 193 * calibrated ADC channels 194 * @gain: Gain of the ADC channel 195 * @offset: Offset of the ADC channel 196 * @otp_calib_hi: Calibration from OTP 197 * @otp_calib_lo: Calibration from OTP 198 */ 199 struct ab8500_adc_cal_data { 200 s64 gain; 201 s64 offset; 202 u16 otp_calib_hi; 203 u16 otp_calib_lo; 204 }; 205 206 /** 207 * struct ab8500_gpadc_chan_info - per-channel GPADC info 208 * @name: name of the channel 209 * @id: the internal AB8500 ID number for the channel 210 * @hardware_control: indicate that we want to use hardware ADC control 211 * on this channel, the default is software ADC control. Hardware control 212 * is normally only used to test the battery voltage during GSM bursts 213 * and needs a hardware trigger on the GPADCTrig pin of the ASIC. 214 * @falling_edge: indicate that we want to trigger on falling edge 215 * rather than rising edge, rising edge is the default 216 * @avg_sample: how many samples to average: must be 1, 4, 8 or 16. 217 * @trig_timer: how long to wait for the trigger, in 32kHz periods: 218 * 0 .. 255 periods 219 */ 220 struct ab8500_gpadc_chan_info { 221 const char *name; 222 u8 id; 223 bool hardware_control; 224 bool falling_edge; 225 u8 avg_sample; 226 u8 trig_timer; 227 }; 228 229 /** 230 * struct ab8500_gpadc - AB8500 GPADC device information 231 * @dev: pointer to the containing device 232 * @ab8500: pointer to the parent AB8500 device 233 * @chans: internal per-channel information container 234 * @nchans: number of channels 235 * @complete: pointer to the completion that indicates 236 * the completion of an gpadc conversion cycle 237 * @vddadc: pointer to the regulator supplying VDDADC 238 * @irq_sw: interrupt number that is used by gpadc for software ADC conversion 239 * @irq_hw: interrupt number that is used by gpadc for hardware ADC conversion 240 * @cal_data: array of ADC calibration data structs 241 */ 242 struct ab8500_gpadc { 243 struct device *dev; 244 struct ab8500 *ab8500; 245 struct ab8500_gpadc_chan_info *chans; 246 unsigned int nchans; 247 struct completion complete; 248 struct regulator *vddadc; 249 int irq_sw; 250 int irq_hw; 251 struct ab8500_adc_cal_data cal_data[AB8500_CAL_NR]; 252 }; 253 254 static struct ab8500_gpadc_chan_info * 255 ab8500_gpadc_get_channel(struct ab8500_gpadc *gpadc, u8 chan) 256 { 257 struct ab8500_gpadc_chan_info *ch; 258 int i; 259 260 for (i = 0; i < gpadc->nchans; i++) { 261 ch = &gpadc->chans[i]; 262 if (ch->id == chan) 263 break; 264 } 265 if (i == gpadc->nchans) 266 return NULL; 267 268 return ch; 269 } 270 271 /** 272 * ab8500_gpadc_ad_to_voltage() - Convert a raw ADC value to a voltage 273 * @gpadc: GPADC instance 274 * @ch: the sampled channel this raw value is coming from 275 * @ad_value: the raw value 276 */ 277 static int ab8500_gpadc_ad_to_voltage(struct ab8500_gpadc *gpadc, 278 enum ab8500_gpadc_channel ch, 279 int ad_value) 280 { 281 int res; 282 283 switch (ch) { 284 case AB8500_GPADC_CHAN_MAIN_CHARGER: 285 /* No calibration data available: just interpolate */ 286 if (!gpadc->cal_data[AB8500_CAL_VMAIN].gain) { 287 res = AB8500_ADC_CH_CHG_V_MIN + (AB8500_ADC_CH_CHG_V_MAX - 288 AB8500_ADC_CH_CHG_V_MIN) * ad_value / 289 AB8500_ADC_RESOLUTION; 290 break; 291 } 292 /* Here we can use calibration */ 293 res = (int) (ad_value * gpadc->cal_data[AB8500_CAL_VMAIN].gain + 294 gpadc->cal_data[AB8500_CAL_VMAIN].offset) / AB8500_GPADC_CALIB_SCALE; 295 break; 296 297 case AB8500_GPADC_CHAN_BAT_CTRL: 298 case AB8500_GPADC_CHAN_BAT_TEMP: 299 case AB8500_GPADC_CHAN_ACC_DET_1: 300 case AB8500_GPADC_CHAN_ADC_AUX_1: 301 case AB8500_GPADC_CHAN_ADC_AUX_2: 302 case AB8500_GPADC_CHAN_XTAL_TEMP: 303 /* No calibration data available: just interpolate */ 304 if (!gpadc->cal_data[AB8500_CAL_BTEMP].gain) { 305 res = AB8500_ADC_CH_BTEMP_MIN + (AB8500_ADC_CH_BTEMP_MAX - 306 AB8500_ADC_CH_BTEMP_MIN) * ad_value / 307 AB8500_ADC_RESOLUTION; 308 break; 309 } 310 /* Here we can use calibration */ 311 res = (int) (ad_value * gpadc->cal_data[AB8500_CAL_BTEMP].gain + 312 gpadc->cal_data[AB8500_CAL_BTEMP].offset) / AB8500_GPADC_CALIB_SCALE; 313 break; 314 315 case AB8500_GPADC_CHAN_VBAT_A: 316 case AB8500_GPADC_CHAN_VBAT_TRUE_MEAS: 317 /* No calibration data available: just interpolate */ 318 if (!gpadc->cal_data[AB8500_CAL_VBAT].gain) { 319 res = AB8500_ADC_CH_VBAT_MIN + (AB8500_ADC_CH_VBAT_MAX - 320 AB8500_ADC_CH_VBAT_MIN) * ad_value / 321 AB8500_ADC_RESOLUTION; 322 break; 323 } 324 /* Here we can use calibration */ 325 res = (int) (ad_value * gpadc->cal_data[AB8500_CAL_VBAT].gain + 326 gpadc->cal_data[AB8500_CAL_VBAT].offset) / AB8500_GPADC_CALIB_SCALE; 327 break; 328 329 case AB8505_GPADC_CHAN_DIE_TEMP: 330 res = AB8500_ADC_CH_DIETEMP_MIN + 331 (AB8500_ADC_CH_DIETEMP_MAX - AB8500_ADC_CH_DIETEMP_MIN) * ad_value / 332 AB8500_ADC_RESOLUTION; 333 break; 334 335 case AB8500_GPADC_CHAN_ACC_DET_2: 336 res = AB8500_ADC_CH_ACCDET2_MIN + 337 (AB8500_ADC_CH_ACCDET2_MAX - AB8500_ADC_CH_ACCDET2_MIN) * ad_value / 338 AB8500_ADC_RESOLUTION; 339 break; 340 341 case AB8500_GPADC_CHAN_VBUS: 342 res = AB8500_ADC_CH_CHG_V_MIN + 343 (AB8500_ADC_CH_CHG_V_MAX - AB8500_ADC_CH_CHG_V_MIN) * ad_value / 344 AB8500_ADC_RESOLUTION; 345 break; 346 347 case AB8500_GPADC_CHAN_MAIN_CHARGER_CURRENT: 348 case AB8500_GPADC_CHAN_USB_CHARGER_CURRENT: 349 res = AB8500_ADC_CH_CHG_I_MIN + 350 (AB8500_ADC_CH_CHG_I_MAX - AB8500_ADC_CH_CHG_I_MIN) * ad_value / 351 AB8500_ADC_RESOLUTION; 352 break; 353 354 case AB8500_GPADC_CHAN_BACKUP_BAT: 355 res = AB8500_ADC_CH_BKBAT_MIN + 356 (AB8500_ADC_CH_BKBAT_MAX - AB8500_ADC_CH_BKBAT_MIN) * ad_value / 357 AB8500_ADC_RESOLUTION; 358 break; 359 360 case AB8500_GPADC_CHAN_IBAT_VIRTUAL: 361 /* No calibration data available: just interpolate */ 362 if (!gpadc->cal_data[AB8500_CAL_IBAT].gain) { 363 res = AB8500_ADC_CH_IBAT_MIN + (AB8500_ADC_CH_IBAT_MAX - 364 AB8500_ADC_CH_IBAT_MIN) * ad_value / 365 AB8500_ADC_RESOLUTION; 366 break; 367 } 368 /* Here we can use calibration */ 369 res = (int) (ad_value * gpadc->cal_data[AB8500_CAL_IBAT].gain + 370 gpadc->cal_data[AB8500_CAL_IBAT].offset) 371 >> AB8500_GPADC_CALIB_SHIFT_IBAT; 372 break; 373 374 default: 375 dev_err(gpadc->dev, 376 "unknown channel ID: %d, not possible to convert\n", 377 ch); 378 res = -EINVAL; 379 break; 380 381 } 382 383 return res; 384 } 385 386 static int ab8500_gpadc_read(struct ab8500_gpadc *gpadc, 387 const struct ab8500_gpadc_chan_info *ch, 388 int *ibat) 389 { 390 int ret; 391 int looplimit = 0; 392 unsigned long completion_timeout; 393 u8 val; 394 u8 low_data, high_data, low_data2, high_data2; 395 u8 ctrl1; 396 u8 ctrl23; 397 unsigned int delay_min = 0; 398 unsigned int delay_max = 0; 399 u8 data_low_addr, data_high_addr; 400 401 if (!gpadc) 402 return -ENODEV; 403 404 /* check if conversion is supported */ 405 if ((gpadc->irq_sw <= 0) && !ch->hardware_control) 406 return -ENOTSUPP; 407 if ((gpadc->irq_hw <= 0) && ch->hardware_control) 408 return -ENOTSUPP; 409 410 /* Enable vddadc by grabbing PM runtime */ 411 pm_runtime_get_sync(gpadc->dev); 412 413 /* Check if ADC is not busy, lock and proceed */ 414 do { 415 ret = abx500_get_register_interruptible(gpadc->dev, 416 AB8500_GPADC, AB8500_GPADC_STAT_REG, &val); 417 if (ret < 0) 418 goto out; 419 if (!(val & AB8500_GPADC_STAT_BUSY)) 420 break; 421 msleep(20); 422 } while (++looplimit < 10); 423 if (looplimit >= 10 && (val & AB8500_GPADC_STAT_BUSY)) { 424 dev_err(gpadc->dev, "gpadc_conversion: GPADC busy"); 425 ret = -EINVAL; 426 goto out; 427 } 428 429 /* Enable GPADC */ 430 ctrl1 = AB8500_GPADC_CTRL1_ENABLE; 431 432 /* Select the channel source and set average samples */ 433 switch (ch->avg_sample) { 434 case 1: 435 ctrl23 = ch->id | AB8500_GPADC_CTRL2_AVG_1; 436 break; 437 case 4: 438 ctrl23 = ch->id | AB8500_GPADC_CTRL2_AVG_4; 439 break; 440 case 8: 441 ctrl23 = ch->id | AB8500_GPADC_CTRL2_AVG_8; 442 break; 443 default: 444 ctrl23 = ch->id | AB8500_GPADC_CTRL2_AVG_16; 445 break; 446 } 447 448 if (ch->hardware_control) { 449 ret = abx500_set_register_interruptible(gpadc->dev, 450 AB8500_GPADC, AB8500_GPADC_CTRL3_REG, ctrl23); 451 ctrl1 |= AB8500_GPADC_CTRL1_TRIG_ENA; 452 if (ch->falling_edge) 453 ctrl1 |= AB8500_GPADC_CTRL1_TRIG_EDGE; 454 } else { 455 ret = abx500_set_register_interruptible(gpadc->dev, 456 AB8500_GPADC, AB8500_GPADC_CTRL2_REG, ctrl23); 457 } 458 if (ret < 0) { 459 dev_err(gpadc->dev, 460 "gpadc_conversion: set avg samples failed\n"); 461 goto out; 462 } 463 464 /* 465 * Enable ADC, buffering, select rising edge and enable ADC path 466 * charging current sense if it needed, ABB 3.0 needs some special 467 * treatment too. 468 */ 469 switch (ch->id) { 470 case AB8500_GPADC_CHAN_MAIN_CHARGER_CURRENT: 471 case AB8500_GPADC_CHAN_USB_CHARGER_CURRENT: 472 ctrl1 |= AB8500_GPADC_CTRL1_BUF_ENA | 473 AB8500_GPADC_CTRL1_ICHAR_ENA; 474 break; 475 case AB8500_GPADC_CHAN_BAT_TEMP: 476 if (!is_ab8500_2p0_or_earlier(gpadc->ab8500)) { 477 ctrl1 |= AB8500_GPADC_CTRL1_BUF_ENA | 478 AB8500_GPADC_CTRL1_BTEMP_PULL_UP; 479 /* 480 * Delay might be needed for ABB8500 cut 3.0, if not, 481 * remove when hardware will be available 482 */ 483 delay_min = 1000; /* Delay in micro seconds */ 484 delay_max = 10000; /* large range optimises sleepmode */ 485 break; 486 } 487 fallthrough; 488 default: 489 ctrl1 |= AB8500_GPADC_CTRL1_BUF_ENA; 490 break; 491 } 492 493 /* Write configuration to control register 1 */ 494 ret = abx500_set_register_interruptible(gpadc->dev, 495 AB8500_GPADC, AB8500_GPADC_CTRL1_REG, ctrl1); 496 if (ret < 0) { 497 dev_err(gpadc->dev, 498 "gpadc_conversion: set Control register failed\n"); 499 goto out; 500 } 501 502 if (delay_min != 0) 503 usleep_range(delay_min, delay_max); 504 505 if (ch->hardware_control) { 506 /* Set trigger delay timer */ 507 ret = abx500_set_register_interruptible(gpadc->dev, 508 AB8500_GPADC, AB8500_GPADC_AUTO_TIMER_REG, 509 ch->trig_timer); 510 if (ret < 0) { 511 dev_err(gpadc->dev, 512 "gpadc_conversion: trig timer failed\n"); 513 goto out; 514 } 515 completion_timeout = 2 * HZ; 516 data_low_addr = AB8500_GPADC_AUTODATAL_REG; 517 data_high_addr = AB8500_GPADC_AUTODATAH_REG; 518 } else { 519 /* Start SW conversion */ 520 ret = abx500_mask_and_set_register_interruptible(gpadc->dev, 521 AB8500_GPADC, AB8500_GPADC_CTRL1_REG, 522 AB8500_GPADC_CTRL1_START_SW_CONV, 523 AB8500_GPADC_CTRL1_START_SW_CONV); 524 if (ret < 0) { 525 dev_err(gpadc->dev, 526 "gpadc_conversion: start s/w conv failed\n"); 527 goto out; 528 } 529 completion_timeout = msecs_to_jiffies(AB8500_GPADC_CONVERSION_TIME); 530 data_low_addr = AB8500_GPADC_MANDATAL_REG; 531 data_high_addr = AB8500_GPADC_MANDATAH_REG; 532 } 533 534 /* Wait for completion of conversion */ 535 if (!wait_for_completion_timeout(&gpadc->complete, 536 completion_timeout)) { 537 dev_err(gpadc->dev, 538 "timeout didn't receive GPADC conv interrupt\n"); 539 ret = -EINVAL; 540 goto out; 541 } 542 543 /* Read the converted RAW data */ 544 ret = abx500_get_register_interruptible(gpadc->dev, 545 AB8500_GPADC, data_low_addr, &low_data); 546 if (ret < 0) { 547 dev_err(gpadc->dev, 548 "gpadc_conversion: read low data failed\n"); 549 goto out; 550 } 551 552 ret = abx500_get_register_interruptible(gpadc->dev, 553 AB8500_GPADC, data_high_addr, &high_data); 554 if (ret < 0) { 555 dev_err(gpadc->dev, 556 "gpadc_conversion: read high data failed\n"); 557 goto out; 558 } 559 560 /* Check if double conversion is required */ 561 if ((ch->id == AB8500_GPADC_CHAN_BAT_CTRL_AND_IBAT) || 562 (ch->id == AB8500_GPADC_CHAN_VBAT_MEAS_AND_IBAT) || 563 (ch->id == AB8500_GPADC_CHAN_VBAT_TRUE_MEAS_AND_IBAT) || 564 (ch->id == AB8500_GPADC_CHAN_BAT_TEMP_AND_IBAT)) { 565 566 if (ch->hardware_control) { 567 /* not supported */ 568 ret = -ENOTSUPP; 569 dev_err(gpadc->dev, 570 "gpadc_conversion: only SW double conversion supported\n"); 571 goto out; 572 } else { 573 /* Read the converted RAW data 2 */ 574 ret = abx500_get_register_interruptible(gpadc->dev, 575 AB8500_GPADC, AB8540_GPADC_MANDATA2L_REG, 576 &low_data2); 577 if (ret < 0) { 578 dev_err(gpadc->dev, 579 "gpadc_conversion: read sw low data 2 failed\n"); 580 goto out; 581 } 582 583 ret = abx500_get_register_interruptible(gpadc->dev, 584 AB8500_GPADC, AB8540_GPADC_MANDATA2H_REG, 585 &high_data2); 586 if (ret < 0) { 587 dev_err(gpadc->dev, 588 "gpadc_conversion: read sw high data 2 failed\n"); 589 goto out; 590 } 591 if (ibat != NULL) { 592 *ibat = (high_data2 << 8) | low_data2; 593 } else { 594 dev_warn(gpadc->dev, 595 "gpadc_conversion: ibat not stored\n"); 596 } 597 598 } 599 } 600 601 /* Disable GPADC */ 602 ret = abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC, 603 AB8500_GPADC_CTRL1_REG, AB8500_GPADC_CTRL1_DISABLE); 604 if (ret < 0) { 605 dev_err(gpadc->dev, "gpadc_conversion: disable gpadc failed\n"); 606 goto out; 607 } 608 609 /* This eventually drops the regulator */ 610 pm_runtime_mark_last_busy(gpadc->dev); 611 pm_runtime_put_autosuspend(gpadc->dev); 612 613 return (high_data << 8) | low_data; 614 615 out: 616 /* 617 * It has shown to be needed to turn off the GPADC if an error occurs, 618 * otherwise we might have problem when waiting for the busy bit in the 619 * GPADC status register to go low. In V1.1 there wait_for_completion 620 * seems to timeout when waiting for an interrupt.. Not seen in V2.0 621 */ 622 (void) abx500_set_register_interruptible(gpadc->dev, AB8500_GPADC, 623 AB8500_GPADC_CTRL1_REG, AB8500_GPADC_CTRL1_DISABLE); 624 pm_runtime_put(gpadc->dev); 625 dev_err(gpadc->dev, 626 "gpadc_conversion: Failed to AD convert channel %d\n", ch->id); 627 628 return ret; 629 } 630 631 /** 632 * ab8500_bm_gpadcconvend_handler() - isr for gpadc conversion completion 633 * @irq: irq number 634 * @data: pointer to the data passed during request irq 635 * 636 * This is a interrupt service routine for gpadc conversion completion. 637 * Notifies the gpadc completion is completed and the converted raw value 638 * can be read from the registers. 639 * Returns IRQ status(IRQ_HANDLED) 640 */ 641 static irqreturn_t ab8500_bm_gpadcconvend_handler(int irq, void *data) 642 { 643 struct ab8500_gpadc *gpadc = data; 644 645 complete(&gpadc->complete); 646 647 return IRQ_HANDLED; 648 } 649 650 static int otp_cal_regs[] = { 651 AB8500_GPADC_CAL_1, 652 AB8500_GPADC_CAL_2, 653 AB8500_GPADC_CAL_3, 654 AB8500_GPADC_CAL_4, 655 AB8500_GPADC_CAL_5, 656 AB8500_GPADC_CAL_6, 657 AB8500_GPADC_CAL_7, 658 }; 659 660 static int otp4_cal_regs[] = { 661 AB8540_GPADC_OTP4_REG_7, 662 AB8540_GPADC_OTP4_REG_6, 663 AB8540_GPADC_OTP4_REG_5, 664 }; 665 666 static void ab8500_gpadc_read_calibration_data(struct ab8500_gpadc *gpadc) 667 { 668 int i; 669 int ret[ARRAY_SIZE(otp_cal_regs)]; 670 u8 gpadc_cal[ARRAY_SIZE(otp_cal_regs)]; 671 int ret_otp4[ARRAY_SIZE(otp4_cal_regs)]; 672 u8 gpadc_otp4[ARRAY_SIZE(otp4_cal_regs)]; 673 int vmain_high, vmain_low; 674 int btemp_high, btemp_low; 675 int vbat_high, vbat_low; 676 int ibat_high, ibat_low; 677 s64 V_gain, V_offset, V2A_gain, V2A_offset; 678 679 /* First we read all OTP registers and store the error code */ 680 for (i = 0; i < ARRAY_SIZE(otp_cal_regs); i++) { 681 ret[i] = abx500_get_register_interruptible(gpadc->dev, 682 AB8500_OTP_EMUL, otp_cal_regs[i], &gpadc_cal[i]); 683 if (ret[i] < 0) { 684 /* Continue anyway: maybe the other registers are OK */ 685 dev_err(gpadc->dev, "%s: read otp reg 0x%02x failed\n", 686 __func__, otp_cal_regs[i]); 687 } else { 688 /* Put this in the entropy pool as device-unique */ 689 add_device_randomness(&ret[i], sizeof(ret[i])); 690 } 691 } 692 693 /* 694 * The ADC calibration data is stored in OTP registers. 695 * The layout of the calibration data is outlined below and a more 696 * detailed description can be found in UM0836 697 * 698 * vm_h/l = vmain_high/low 699 * bt_h/l = btemp_high/low 700 * vb_h/l = vbat_high/low 701 * 702 * Data bits 8500/9540: 703 * | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 704 * |.......|.......|.......|.......|.......|.......|.......|....... 705 * | | vm_h9 | vm_h8 706 * |.......|.......|.......|.......|.......|.......|.......|....... 707 * | | vm_h7 | vm_h6 | vm_h5 | vm_h4 | vm_h3 | vm_h2 708 * |.......|.......|.......|.......|.......|.......|.......|....... 709 * | vm_h1 | vm_h0 | vm_l4 | vm_l3 | vm_l2 | vm_l1 | vm_l0 | bt_h9 710 * |.......|.......|.......|.......|.......|.......|.......|....... 711 * | bt_h8 | bt_h7 | bt_h6 | bt_h5 | bt_h4 | bt_h3 | bt_h2 | bt_h1 712 * |.......|.......|.......|.......|.......|.......|.......|....... 713 * | bt_h0 | bt_l4 | bt_l3 | bt_l2 | bt_l1 | bt_l0 | vb_h9 | vb_h8 714 * |.......|.......|.......|.......|.......|.......|.......|....... 715 * | vb_h7 | vb_h6 | vb_h5 | vb_h4 | vb_h3 | vb_h2 | vb_h1 | vb_h0 716 * |.......|.......|.......|.......|.......|.......|.......|....... 717 * | vb_l5 | vb_l4 | vb_l3 | vb_l2 | vb_l1 | vb_l0 | 718 * |.......|.......|.......|.......|.......|.......|.......|....... 719 * 720 * Data bits 8540: 721 * OTP2 722 * | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 723 * |.......|.......|.......|.......|.......|.......|.......|....... 724 * | 725 * |.......|.......|.......|.......|.......|.......|.......|....... 726 * | vm_h9 | vm_h8 | vm_h7 | vm_h6 | vm_h5 | vm_h4 | vm_h3 | vm_h2 727 * |.......|.......|.......|.......|.......|.......|.......|....... 728 * | vm_h1 | vm_h0 | vm_l4 | vm_l3 | vm_l2 | vm_l1 | vm_l0 | bt_h9 729 * |.......|.......|.......|.......|.......|.......|.......|....... 730 * | bt_h8 | bt_h7 | bt_h6 | bt_h5 | bt_h4 | bt_h3 | bt_h2 | bt_h1 731 * |.......|.......|.......|.......|.......|.......|.......|....... 732 * | bt_h0 | bt_l4 | bt_l3 | bt_l2 | bt_l1 | bt_l0 | vb_h9 | vb_h8 733 * |.......|.......|.......|.......|.......|.......|.......|....... 734 * | vb_h7 | vb_h6 | vb_h5 | vb_h4 | vb_h3 | vb_h2 | vb_h1 | vb_h0 735 * |.......|.......|.......|.......|.......|.......|.......|....... 736 * | vb_l5 | vb_l4 | vb_l3 | vb_l2 | vb_l1 | vb_l0 | 737 * |.......|.......|.......|.......|.......|.......|.......|....... 738 * 739 * Data bits 8540: 740 * OTP4 741 * | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 742 * |.......|.......|.......|.......|.......|.......|.......|....... 743 * | | ib_h9 | ib_h8 | ib_h7 744 * |.......|.......|.......|.......|.......|.......|.......|....... 745 * | ib_h6 | ib_h5 | ib_h4 | ib_h3 | ib_h2 | ib_h1 | ib_h0 | ib_l5 746 * |.......|.......|.......|.......|.......|.......|.......|....... 747 * | ib_l4 | ib_l3 | ib_l2 | ib_l1 | ib_l0 | 748 * 749 * 750 * Ideal output ADC codes corresponding to injected input voltages 751 * during manufacturing is: 752 * 753 * vmain_high: Vin = 19500mV / ADC ideal code = 997 754 * vmain_low: Vin = 315mV / ADC ideal code = 16 755 * btemp_high: Vin = 1300mV / ADC ideal code = 985 756 * btemp_low: Vin = 21mV / ADC ideal code = 16 757 * vbat_high: Vin = 4700mV / ADC ideal code = 982 758 * vbat_low: Vin = 2380mV / ADC ideal code = 33 759 */ 760 761 if (is_ab8540(gpadc->ab8500)) { 762 /* Calculate gain and offset for VMAIN if all reads succeeded*/ 763 if (!(ret[1] < 0 || ret[2] < 0)) { 764 vmain_high = (((gpadc_cal[1] & 0xFF) << 2) | 765 ((gpadc_cal[2] & 0xC0) >> 6)); 766 vmain_low = ((gpadc_cal[2] & 0x3E) >> 1); 767 768 gpadc->cal_data[AB8500_CAL_VMAIN].otp_calib_hi = 769 (u16)vmain_high; 770 gpadc->cal_data[AB8500_CAL_VMAIN].otp_calib_lo = 771 (u16)vmain_low; 772 773 gpadc->cal_data[AB8500_CAL_VMAIN].gain = AB8500_GPADC_CALIB_SCALE * 774 (19500 - 315) / (vmain_high - vmain_low); 775 gpadc->cal_data[AB8500_CAL_VMAIN].offset = AB8500_GPADC_CALIB_SCALE * 776 19500 - (AB8500_GPADC_CALIB_SCALE * (19500 - 315) / 777 (vmain_high - vmain_low)) * vmain_high; 778 } else { 779 gpadc->cal_data[AB8500_CAL_VMAIN].gain = 0; 780 } 781 782 /* Read IBAT calibration Data */ 783 for (i = 0; i < ARRAY_SIZE(otp4_cal_regs); i++) { 784 ret_otp4[i] = abx500_get_register_interruptible( 785 gpadc->dev, AB8500_OTP_EMUL, 786 otp4_cal_regs[i], &gpadc_otp4[i]); 787 if (ret_otp4[i] < 0) 788 dev_err(gpadc->dev, 789 "%s: read otp4 reg 0x%02x failed\n", 790 __func__, otp4_cal_regs[i]); 791 } 792 793 /* Calculate gain and offset for IBAT if all reads succeeded */ 794 if (!(ret_otp4[0] < 0 || ret_otp4[1] < 0 || ret_otp4[2] < 0)) { 795 ibat_high = (((gpadc_otp4[0] & 0x07) << 7) | 796 ((gpadc_otp4[1] & 0xFE) >> 1)); 797 ibat_low = (((gpadc_otp4[1] & 0x01) << 5) | 798 ((gpadc_otp4[2] & 0xF8) >> 3)); 799 800 gpadc->cal_data[AB8500_CAL_IBAT].otp_calib_hi = 801 (u16)ibat_high; 802 gpadc->cal_data[AB8500_CAL_IBAT].otp_calib_lo = 803 (u16)ibat_low; 804 805 V_gain = ((AB8500_GPADC_IBAT_VDROP_H - AB8500_GPADC_IBAT_VDROP_L) 806 << AB8500_GPADC_CALIB_SHIFT_IBAT) / (ibat_high - ibat_low); 807 808 V_offset = (AB8500_GPADC_IBAT_VDROP_H << AB8500_GPADC_CALIB_SHIFT_IBAT) - 809 (((AB8500_GPADC_IBAT_VDROP_H - AB8500_GPADC_IBAT_VDROP_L) << 810 AB8500_GPADC_CALIB_SHIFT_IBAT) / (ibat_high - ibat_low)) 811 * ibat_high; 812 /* 813 * Result obtained is in mV (at a scale factor), 814 * we need to calculate gain and offset to get mA 815 */ 816 V2A_gain = (AB8500_ADC_CH_IBAT_MAX - AB8500_ADC_CH_IBAT_MIN)/ 817 (AB8500_ADC_CH_IBAT_MAX_V - AB8500_ADC_CH_IBAT_MIN_V); 818 V2A_offset = ((AB8500_ADC_CH_IBAT_MAX_V * AB8500_ADC_CH_IBAT_MIN - 819 AB8500_ADC_CH_IBAT_MAX * AB8500_ADC_CH_IBAT_MIN_V) 820 << AB8500_GPADC_CALIB_SHIFT_IBAT) 821 / (AB8500_ADC_CH_IBAT_MAX_V - AB8500_ADC_CH_IBAT_MIN_V); 822 823 gpadc->cal_data[AB8500_CAL_IBAT].gain = 824 V_gain * V2A_gain; 825 gpadc->cal_data[AB8500_CAL_IBAT].offset = 826 V_offset * V2A_gain + V2A_offset; 827 } else { 828 gpadc->cal_data[AB8500_CAL_IBAT].gain = 0; 829 } 830 } else { 831 /* Calculate gain and offset for VMAIN if all reads succeeded */ 832 if (!(ret[0] < 0 || ret[1] < 0 || ret[2] < 0)) { 833 vmain_high = (((gpadc_cal[0] & 0x03) << 8) | 834 ((gpadc_cal[1] & 0x3F) << 2) | 835 ((gpadc_cal[2] & 0xC0) >> 6)); 836 vmain_low = ((gpadc_cal[2] & 0x3E) >> 1); 837 838 gpadc->cal_data[AB8500_CAL_VMAIN].otp_calib_hi = 839 (u16)vmain_high; 840 gpadc->cal_data[AB8500_CAL_VMAIN].otp_calib_lo = 841 (u16)vmain_low; 842 843 gpadc->cal_data[AB8500_CAL_VMAIN].gain = AB8500_GPADC_CALIB_SCALE * 844 (19500 - 315) / (vmain_high - vmain_low); 845 846 gpadc->cal_data[AB8500_CAL_VMAIN].offset = AB8500_GPADC_CALIB_SCALE * 847 19500 - (AB8500_GPADC_CALIB_SCALE * (19500 - 315) / 848 (vmain_high - vmain_low)) * vmain_high; 849 } else { 850 gpadc->cal_data[AB8500_CAL_VMAIN].gain = 0; 851 } 852 } 853 854 /* Calculate gain and offset for BTEMP if all reads succeeded */ 855 if (!(ret[2] < 0 || ret[3] < 0 || ret[4] < 0)) { 856 btemp_high = (((gpadc_cal[2] & 0x01) << 9) | 857 (gpadc_cal[3] << 1) | ((gpadc_cal[4] & 0x80) >> 7)); 858 btemp_low = ((gpadc_cal[4] & 0x7C) >> 2); 859 860 gpadc->cal_data[AB8500_CAL_BTEMP].otp_calib_hi = (u16)btemp_high; 861 gpadc->cal_data[AB8500_CAL_BTEMP].otp_calib_lo = (u16)btemp_low; 862 863 gpadc->cal_data[AB8500_CAL_BTEMP].gain = 864 AB8500_GPADC_CALIB_SCALE * (1300 - 21) / (btemp_high - btemp_low); 865 gpadc->cal_data[AB8500_CAL_BTEMP].offset = AB8500_GPADC_CALIB_SCALE * 1300 - 866 (AB8500_GPADC_CALIB_SCALE * (1300 - 21) / (btemp_high - btemp_low)) 867 * btemp_high; 868 } else { 869 gpadc->cal_data[AB8500_CAL_BTEMP].gain = 0; 870 } 871 872 /* Calculate gain and offset for VBAT if all reads succeeded */ 873 if (!(ret[4] < 0 || ret[5] < 0 || ret[6] < 0)) { 874 vbat_high = (((gpadc_cal[4] & 0x03) << 8) | gpadc_cal[5]); 875 vbat_low = ((gpadc_cal[6] & 0xFC) >> 2); 876 877 gpadc->cal_data[AB8500_CAL_VBAT].otp_calib_hi = (u16)vbat_high; 878 gpadc->cal_data[AB8500_CAL_VBAT].otp_calib_lo = (u16)vbat_low; 879 880 gpadc->cal_data[AB8500_CAL_VBAT].gain = AB8500_GPADC_CALIB_SCALE * 881 (4700 - 2380) / (vbat_high - vbat_low); 882 gpadc->cal_data[AB8500_CAL_VBAT].offset = AB8500_GPADC_CALIB_SCALE * 4700 - 883 (AB8500_GPADC_CALIB_SCALE * (4700 - 2380) / 884 (vbat_high - vbat_low)) * vbat_high; 885 } else { 886 gpadc->cal_data[AB8500_CAL_VBAT].gain = 0; 887 } 888 } 889 890 static int ab8500_gpadc_read_raw(struct iio_dev *indio_dev, 891 struct iio_chan_spec const *chan, 892 int *val, int *val2, long mask) 893 { 894 struct ab8500_gpadc *gpadc = iio_priv(indio_dev); 895 const struct ab8500_gpadc_chan_info *ch; 896 int raw_val; 897 int processed; 898 899 ch = ab8500_gpadc_get_channel(gpadc, chan->address); 900 if (!ch) { 901 dev_err(gpadc->dev, "no such channel %lu\n", 902 chan->address); 903 return -EINVAL; 904 } 905 906 raw_val = ab8500_gpadc_read(gpadc, ch, NULL); 907 if (raw_val < 0) 908 return raw_val; 909 910 if (mask == IIO_CHAN_INFO_RAW) { 911 *val = raw_val; 912 return IIO_VAL_INT; 913 } 914 915 if (mask == IIO_CHAN_INFO_PROCESSED) { 916 processed = ab8500_gpadc_ad_to_voltage(gpadc, ch->id, raw_val); 917 if (processed < 0) 918 return processed; 919 920 /* Return millivolt or milliamps or millicentigrades */ 921 *val = processed; 922 return IIO_VAL_INT; 923 } 924 925 return -EINVAL; 926 } 927 928 static int ab8500_gpadc_fwnode_xlate(struct iio_dev *indio_dev, 929 const struct fwnode_reference_args *iiospec) 930 { 931 int i; 932 933 for (i = 0; i < indio_dev->num_channels; i++) 934 if (indio_dev->channels[i].channel == iiospec->args[0]) 935 return i; 936 937 return -EINVAL; 938 } 939 940 static const struct iio_info ab8500_gpadc_info = { 941 .fwnode_xlate = ab8500_gpadc_fwnode_xlate, 942 .read_raw = ab8500_gpadc_read_raw, 943 }; 944 945 static int ab8500_gpadc_runtime_suspend(struct device *dev) 946 { 947 struct iio_dev *indio_dev = dev_get_drvdata(dev); 948 struct ab8500_gpadc *gpadc = iio_priv(indio_dev); 949 950 regulator_disable(gpadc->vddadc); 951 952 return 0; 953 } 954 955 static int ab8500_gpadc_runtime_resume(struct device *dev) 956 { 957 struct iio_dev *indio_dev = dev_get_drvdata(dev); 958 struct ab8500_gpadc *gpadc = iio_priv(indio_dev); 959 int ret; 960 961 ret = regulator_enable(gpadc->vddadc); 962 if (ret) 963 dev_err(dev, "Failed to enable vddadc: %d\n", ret); 964 965 return ret; 966 } 967 968 /** 969 * ab8500_gpadc_parse_channel() - process devicetree channel configuration 970 * @dev: pointer to containing device 971 * @fwnode: fw node for the channel to configure 972 * @ch: channel info to fill in 973 * @iio_chan: IIO channel specification to fill in 974 * 975 * The devicetree will set up the channel for use with the specific device, 976 * and define usage for things like AUX GPADC inputs more precisely. 977 */ 978 static int ab8500_gpadc_parse_channel(struct device *dev, 979 struct fwnode_handle *fwnode, 980 struct ab8500_gpadc_chan_info *ch, 981 struct iio_chan_spec *iio_chan) 982 { 983 const char *name = fwnode_get_name(fwnode); 984 u32 chan; 985 int ret; 986 987 ret = fwnode_property_read_u32(fwnode, "reg", &chan); 988 if (ret) { 989 dev_err(dev, "invalid channel number %s\n", name); 990 return ret; 991 } 992 if (chan > AB8500_GPADC_CHAN_BAT_TEMP_AND_IBAT) { 993 dev_err(dev, "%s channel number out of range %d\n", name, chan); 994 return -EINVAL; 995 } 996 997 iio_chan->channel = chan; 998 iio_chan->datasheet_name = name; 999 iio_chan->indexed = 1; 1000 iio_chan->address = chan; 1001 iio_chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 1002 BIT(IIO_CHAN_INFO_PROCESSED); 1003 /* Most are voltages (also temperatures), some are currents */ 1004 if ((chan == AB8500_GPADC_CHAN_MAIN_CHARGER_CURRENT) || 1005 (chan == AB8500_GPADC_CHAN_USB_CHARGER_CURRENT)) 1006 iio_chan->type = IIO_CURRENT; 1007 else 1008 iio_chan->type = IIO_VOLTAGE; 1009 1010 ch->id = chan; 1011 1012 /* Sensible defaults */ 1013 ch->avg_sample = 16; 1014 ch->hardware_control = false; 1015 ch->falling_edge = false; 1016 ch->trig_timer = 0; 1017 1018 return 0; 1019 } 1020 1021 /** 1022 * ab8500_gpadc_parse_channels() - Parse the GPADC channels from DT 1023 * @gpadc: the GPADC to configure the channels for 1024 * @chans: the IIO channels we parsed 1025 * @nchans: the number of IIO channels we parsed 1026 */ 1027 static int ab8500_gpadc_parse_channels(struct ab8500_gpadc *gpadc, 1028 struct iio_chan_spec **chans_parsed, 1029 unsigned int *nchans_parsed) 1030 { 1031 struct fwnode_handle *child; 1032 struct ab8500_gpadc_chan_info *ch; 1033 struct iio_chan_spec *iio_chans; 1034 unsigned int nchans; 1035 int i; 1036 1037 nchans = device_get_child_node_count(gpadc->dev); 1038 if (!nchans) { 1039 dev_err(gpadc->dev, "no channel children\n"); 1040 return -ENODEV; 1041 } 1042 dev_info(gpadc->dev, "found %d ADC channels\n", nchans); 1043 1044 iio_chans = devm_kcalloc(gpadc->dev, nchans, 1045 sizeof(*iio_chans), GFP_KERNEL); 1046 if (!iio_chans) 1047 return -ENOMEM; 1048 1049 gpadc->chans = devm_kcalloc(gpadc->dev, nchans, 1050 sizeof(*gpadc->chans), GFP_KERNEL); 1051 if (!gpadc->chans) 1052 return -ENOMEM; 1053 1054 i = 0; 1055 device_for_each_child_node(gpadc->dev, child) { 1056 struct iio_chan_spec *iio_chan; 1057 int ret; 1058 1059 ch = &gpadc->chans[i]; 1060 iio_chan = &iio_chans[i]; 1061 1062 ret = ab8500_gpadc_parse_channel(gpadc->dev, child, ch, 1063 iio_chan); 1064 if (ret) { 1065 fwnode_handle_put(child); 1066 return ret; 1067 } 1068 i++; 1069 } 1070 gpadc->nchans = nchans; 1071 *chans_parsed = iio_chans; 1072 *nchans_parsed = nchans; 1073 1074 return 0; 1075 } 1076 1077 static int ab8500_gpadc_probe(struct platform_device *pdev) 1078 { 1079 struct ab8500_gpadc *gpadc; 1080 struct iio_dev *indio_dev; 1081 struct device *dev = &pdev->dev; 1082 struct iio_chan_spec *iio_chans; 1083 unsigned int n_iio_chans; 1084 int ret; 1085 1086 indio_dev = devm_iio_device_alloc(dev, sizeof(*gpadc)); 1087 if (!indio_dev) 1088 return -ENOMEM; 1089 1090 platform_set_drvdata(pdev, indio_dev); 1091 gpadc = iio_priv(indio_dev); 1092 1093 gpadc->dev = dev; 1094 gpadc->ab8500 = dev_get_drvdata(dev->parent); 1095 1096 ret = ab8500_gpadc_parse_channels(gpadc, &iio_chans, &n_iio_chans); 1097 if (ret) 1098 return ret; 1099 1100 gpadc->irq_sw = platform_get_irq_byname(pdev, "SW_CONV_END"); 1101 if (gpadc->irq_sw < 0) 1102 return gpadc->irq_sw; 1103 1104 if (is_ab8500(gpadc->ab8500)) { 1105 gpadc->irq_hw = platform_get_irq_byname(pdev, "HW_CONV_END"); 1106 if (gpadc->irq_hw < 0) 1107 return gpadc->irq_hw; 1108 } else { 1109 gpadc->irq_hw = 0; 1110 } 1111 1112 /* Initialize completion used to notify completion of conversion */ 1113 init_completion(&gpadc->complete); 1114 1115 /* Request interrupts */ 1116 ret = devm_request_threaded_irq(dev, gpadc->irq_sw, NULL, 1117 ab8500_bm_gpadcconvend_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT, 1118 "ab8500-gpadc-sw", gpadc); 1119 if (ret < 0) { 1120 dev_err(dev, 1121 "failed to request sw conversion irq %d\n", 1122 gpadc->irq_sw); 1123 return ret; 1124 } 1125 1126 if (gpadc->irq_hw) { 1127 ret = devm_request_threaded_irq(dev, gpadc->irq_hw, NULL, 1128 ab8500_bm_gpadcconvend_handler, IRQF_NO_SUSPEND | IRQF_ONESHOT, 1129 "ab8500-gpadc-hw", gpadc); 1130 if (ret < 0) { 1131 dev_err(dev, 1132 "Failed to request hw conversion irq: %d\n", 1133 gpadc->irq_hw); 1134 return ret; 1135 } 1136 } 1137 1138 /* The VTVout LDO used to power the AB8500 GPADC */ 1139 gpadc->vddadc = devm_regulator_get(dev, "vddadc"); 1140 if (IS_ERR(gpadc->vddadc)) 1141 return dev_err_probe(dev, PTR_ERR(gpadc->vddadc), 1142 "failed to get vddadc\n"); 1143 1144 ret = regulator_enable(gpadc->vddadc); 1145 if (ret) { 1146 dev_err(dev, "failed to enable vddadc: %d\n", ret); 1147 return ret; 1148 } 1149 1150 /* Enable runtime PM */ 1151 pm_runtime_get_noresume(dev); 1152 pm_runtime_set_active(dev); 1153 pm_runtime_enable(dev); 1154 pm_runtime_set_autosuspend_delay(dev, AB8500_GPADC_AUTOSUSPEND_DELAY); 1155 pm_runtime_use_autosuspend(dev); 1156 1157 ab8500_gpadc_read_calibration_data(gpadc); 1158 1159 pm_runtime_put(dev); 1160 1161 indio_dev->name = "ab8500-gpadc"; 1162 indio_dev->modes = INDIO_DIRECT_MODE; 1163 indio_dev->info = &ab8500_gpadc_info; 1164 indio_dev->channels = iio_chans; 1165 indio_dev->num_channels = n_iio_chans; 1166 1167 ret = devm_iio_device_register(dev, indio_dev); 1168 if (ret) 1169 goto out_dis_pm; 1170 1171 return 0; 1172 1173 out_dis_pm: 1174 pm_runtime_get_sync(dev); 1175 pm_runtime_put_noidle(dev); 1176 pm_runtime_disable(dev); 1177 regulator_disable(gpadc->vddadc); 1178 1179 return ret; 1180 } 1181 1182 static int ab8500_gpadc_remove(struct platform_device *pdev) 1183 { 1184 struct iio_dev *indio_dev = platform_get_drvdata(pdev); 1185 struct ab8500_gpadc *gpadc = iio_priv(indio_dev); 1186 1187 pm_runtime_get_sync(gpadc->dev); 1188 pm_runtime_put_noidle(gpadc->dev); 1189 pm_runtime_disable(gpadc->dev); 1190 regulator_disable(gpadc->vddadc); 1191 1192 return 0; 1193 } 1194 1195 static DEFINE_RUNTIME_DEV_PM_OPS(ab8500_gpadc_pm_ops, 1196 ab8500_gpadc_runtime_suspend, 1197 ab8500_gpadc_runtime_resume, NULL); 1198 1199 static struct platform_driver ab8500_gpadc_driver = { 1200 .probe = ab8500_gpadc_probe, 1201 .remove = ab8500_gpadc_remove, 1202 .driver = { 1203 .name = "ab8500-gpadc", 1204 .pm = pm_ptr(&ab8500_gpadc_pm_ops), 1205 }, 1206 }; 1207 builtin_platform_driver(ab8500_gpadc_driver); 1208