Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 1 | /* |
Rama Krishna Phani A | ba71704 | 2016-12-09 20:31:49 +0530 | [diff] [blame] | 2 | * Copyright (c) 2012-2016, The Linux Foundation. All rights reserved. |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License version 2 and |
| 6 | * only version 2 as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/bitops.h> |
| 15 | #include <linux/completion.h> |
| 16 | #include <linux/delay.h> |
| 17 | #include <linux/err.h> |
| 18 | #include <linux/iio/iio.h> |
| 19 | #include <linux/interrupt.h> |
| 20 | #include <linux/kernel.h> |
Ivan T. Ivanov | 937125a | 2015-04-17 17:51:08 +0300 | [diff] [blame] | 21 | #include <linux/math64.h> |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 22 | #include <linux/module.h> |
| 23 | #include <linux/of.h> |
| 24 | #include <linux/platform_device.h> |
| 25 | #include <linux/regmap.h> |
| 26 | #include <linux/slab.h> |
| 27 | #include <linux/log2.h> |
| 28 | |
| 29 | #include <dt-bindings/iio/qcom,spmi-vadc.h> |
| 30 | |
| 31 | /* VADC register and bit definitions */ |
| 32 | #define VADC_REVISION2 0x1 |
| 33 | #define VADC_REVISION2_SUPPORTED_VADC 1 |
| 34 | |
| 35 | #define VADC_PERPH_TYPE 0x4 |
| 36 | #define VADC_PERPH_TYPE_ADC 8 |
| 37 | |
| 38 | #define VADC_PERPH_SUBTYPE 0x5 |
| 39 | #define VADC_PERPH_SUBTYPE_VADC 1 |
| 40 | |
| 41 | #define VADC_STATUS1 0x8 |
| 42 | #define VADC_STATUS1_OP_MODE 4 |
| 43 | #define VADC_STATUS1_REQ_STS BIT(1) |
| 44 | #define VADC_STATUS1_EOC BIT(0) |
| 45 | #define VADC_STATUS1_REQ_STS_EOC_MASK 0x3 |
| 46 | |
| 47 | #define VADC_MODE_CTL 0x40 |
| 48 | #define VADC_OP_MODE_SHIFT 3 |
| 49 | #define VADC_OP_MODE_NORMAL 0 |
| 50 | #define VADC_AMUX_TRIM_EN BIT(1) |
| 51 | #define VADC_ADC_TRIM_EN BIT(0) |
| 52 | |
| 53 | #define VADC_EN_CTL1 0x46 |
| 54 | #define VADC_EN_CTL1_SET BIT(7) |
| 55 | |
| 56 | #define VADC_ADC_CH_SEL_CTL 0x48 |
| 57 | |
| 58 | #define VADC_ADC_DIG_PARAM 0x50 |
| 59 | #define VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT 2 |
| 60 | |
| 61 | #define VADC_HW_SETTLE_DELAY 0x51 |
| 62 | |
| 63 | #define VADC_CONV_REQ 0x52 |
| 64 | #define VADC_CONV_REQ_SET BIT(7) |
| 65 | |
| 66 | #define VADC_FAST_AVG_CTL 0x5a |
| 67 | #define VADC_FAST_AVG_EN 0x5b |
| 68 | #define VADC_FAST_AVG_EN_SET BIT(7) |
| 69 | |
| 70 | #define VADC_ACCESS 0xd0 |
| 71 | #define VADC_ACCESS_DATA 0xa5 |
| 72 | |
| 73 | #define VADC_PERH_RESET_CTL3 0xda |
| 74 | #define VADC_FOLLOW_WARM_RB BIT(2) |
| 75 | |
| 76 | #define VADC_DATA 0x60 /* 16 bits */ |
| 77 | |
| 78 | #define VADC_CONV_TIME_MIN_US 2000 |
| 79 | #define VADC_CONV_TIME_MAX_US 2100 |
| 80 | |
| 81 | /* Min ADC code represents 0V */ |
| 82 | #define VADC_MIN_ADC_CODE 0x6000 |
| 83 | /* Max ADC code represents full-scale range of 1.8V */ |
| 84 | #define VADC_MAX_ADC_CODE 0xa800 |
| 85 | |
| 86 | #define VADC_ABSOLUTE_RANGE_UV 625000 |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 87 | #define VADC_RATIOMETRIC_RANGE 1800 |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 88 | |
| 89 | #define VADC_DEF_PRESCALING 0 /* 1:1 */ |
| 90 | #define VADC_DEF_DECIMATION 0 /* 512 */ |
| 91 | #define VADC_DEF_HW_SETTLE_TIME 0 /* 0 us */ |
| 92 | #define VADC_DEF_AVG_SAMPLES 0 /* 1 sample */ |
| 93 | #define VADC_DEF_CALIB_TYPE VADC_CALIB_ABSOLUTE |
| 94 | |
| 95 | #define VADC_DECIMATION_MIN 512 |
| 96 | #define VADC_DECIMATION_MAX 4096 |
| 97 | |
| 98 | #define VADC_HW_SETTLE_DELAY_MAX 10000 |
| 99 | #define VADC_AVG_SAMPLES_MAX 512 |
| 100 | |
| 101 | #define KELVINMIL_CELSIUSMIL 273150 |
| 102 | |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 103 | #define PMI_CHG_SCALE_1 -138890 |
| 104 | #define PMI_CHG_SCALE_2 391750000000 |
| 105 | |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 106 | #define VADC_CHAN_MIN VADC_USBIN |
| 107 | #define VADC_CHAN_MAX VADC_LR_MUX3_BUF_PU1_PU2_XO_THERM |
| 108 | |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 109 | /** |
| 110 | * struct vadc_map_pt - Map the graph representation for ADC channel |
| 111 | * @x: Represent the ADC digitized code. |
| 112 | * @y: Represent the physical data which can be temperature, voltage, |
| 113 | * resistance. |
| 114 | */ |
| 115 | struct vadc_map_pt { |
| 116 | s32 x; |
| 117 | s32 y; |
| 118 | }; |
| 119 | |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 120 | /* |
| 121 | * VADC_CALIB_ABSOLUTE: uses the 625mV and 1.25V as reference channels. |
| 122 | * VADC_CALIB_RATIOMETRIC: uses the reference voltage (1.8V) and GND for |
| 123 | * calibration. |
| 124 | */ |
| 125 | enum vadc_calibration { |
| 126 | VADC_CALIB_ABSOLUTE = 0, |
| 127 | VADC_CALIB_RATIOMETRIC |
| 128 | }; |
| 129 | |
| 130 | /** |
| 131 | * struct vadc_linear_graph - Represent ADC characteristics. |
| 132 | * @dy: numerator slope to calculate the gain. |
| 133 | * @dx: denominator slope to calculate the gain. |
| 134 | * @gnd: A/D word of the ground reference used for the channel. |
| 135 | * |
| 136 | * Each ADC device has different offset and gain parameters which are |
| 137 | * computed to calibrate the device. |
| 138 | */ |
| 139 | struct vadc_linear_graph { |
| 140 | s32 dy; |
| 141 | s32 dx; |
| 142 | s32 gnd; |
| 143 | }; |
| 144 | |
| 145 | /** |
| 146 | * struct vadc_prescale_ratio - Represent scaling ratio for ADC input. |
| 147 | * @num: the inverse numerator of the gain applied to the input channel. |
| 148 | * @den: the inverse denominator of the gain applied to the input channel. |
| 149 | */ |
| 150 | struct vadc_prescale_ratio { |
| 151 | u32 num; |
| 152 | u32 den; |
| 153 | }; |
| 154 | |
| 155 | /** |
| 156 | * struct vadc_channel_prop - VADC channel property. |
| 157 | * @channel: channel number, refer to the channel list. |
| 158 | * @calibration: calibration type. |
| 159 | * @decimation: sampling rate supported for the channel. |
| 160 | * @prescale: channel scaling performed on the input signal. |
| 161 | * @hw_settle_time: the time between AMUX being configured and the |
| 162 | * start of conversion. |
| 163 | * @avg_samples: ability to provide single result from the ADC |
| 164 | * that is an average of multiple measurements. |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 165 | * @scale_fn: Represents the scaling function to convert voltage |
| 166 | * physical units desired by the client for the channel. |
| 167 | * Referenced from enum vadc_scale_fn_type. |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 168 | */ |
| 169 | struct vadc_channel_prop { |
| 170 | unsigned int channel; |
| 171 | enum vadc_calibration calibration; |
| 172 | unsigned int decimation; |
| 173 | unsigned int prescale; |
| 174 | unsigned int hw_settle_time; |
| 175 | unsigned int avg_samples; |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 176 | unsigned int scale_fn; |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 177 | }; |
| 178 | |
| 179 | /** |
| 180 | * struct vadc_priv - VADC private structure. |
| 181 | * @regmap: pointer to struct regmap. |
| 182 | * @dev: pointer to struct device. |
| 183 | * @base: base address for the ADC peripheral. |
| 184 | * @nchannels: number of VADC channels. |
| 185 | * @chan_props: array of VADC channel properties. |
| 186 | * @iio_chans: array of IIO channels specification. |
| 187 | * @are_ref_measured: are reference points measured. |
| 188 | * @poll_eoc: use polling instead of interrupt. |
| 189 | * @complete: VADC result notification after interrupt is received. |
| 190 | * @graph: store parameters for calibration. |
| 191 | * @lock: ADC lock for access to the peripheral. |
| 192 | */ |
| 193 | struct vadc_priv { |
| 194 | struct regmap *regmap; |
| 195 | struct device *dev; |
| 196 | u16 base; |
| 197 | unsigned int nchannels; |
| 198 | struct vadc_channel_prop *chan_props; |
| 199 | struct iio_chan_spec *iio_chans; |
| 200 | bool are_ref_measured; |
| 201 | bool poll_eoc; |
| 202 | struct completion complete; |
| 203 | struct vadc_linear_graph graph[2]; |
| 204 | struct mutex lock; |
| 205 | }; |
| 206 | |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 207 | /** |
| 208 | * struct vadc_scale_fn - Scaling function prototype |
| 209 | * @scale: Function pointer to one of the scaling functions |
| 210 | * which takes the adc properties, channel properties, |
| 211 | * and returns the physical result. |
| 212 | */ |
| 213 | struct vadc_scale_fn { |
| 214 | int (*scale)(struct vadc_priv *, const struct vadc_channel_prop *, |
| 215 | u16, int *); |
| 216 | }; |
| 217 | |
| 218 | /** |
| 219 | * enum vadc_scale_fn_type - Scaling function to convert ADC code to |
| 220 | * physical scaled units for the channel. |
| 221 | * SCALE_DEFAULT: Default scaling to convert raw adc code to voltage (uV). |
| 222 | * SCALE_THERM_100K_PULLUP: Returns temperature in millidegC. |
| 223 | * Uses a mapping table with 100K pullup. |
| 224 | * SCALE_PMIC_THERM: Returns result in milli degree's Centigrade. |
| 225 | * SCALE_XOTHERM: Returns XO thermistor voltage in millidegC. |
| 226 | * SCALE_PMI_CHG_TEMP: Conversion for PMI CHG temp |
| 227 | */ |
| 228 | enum vadc_scale_fn_type { |
| 229 | SCALE_DEFAULT = 0, |
| 230 | SCALE_THERM_100K_PULLUP, |
| 231 | SCALE_PMIC_THERM, |
| 232 | SCALE_XOTHERM, |
| 233 | SCALE_PMI_CHG_TEMP, |
| 234 | }; |
| 235 | |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 236 | static const struct vadc_prescale_ratio vadc_prescale_ratios[] = { |
| 237 | {.num = 1, .den = 1}, |
| 238 | {.num = 1, .den = 3}, |
| 239 | {.num = 1, .den = 4}, |
| 240 | {.num = 1, .den = 6}, |
| 241 | {.num = 1, .den = 20}, |
| 242 | {.num = 1, .den = 8}, |
| 243 | {.num = 10, .den = 81}, |
| 244 | {.num = 1, .den = 10} |
| 245 | }; |
| 246 | |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 247 | /* Voltage to temperature */ |
| 248 | static const struct vadc_map_pt adcmap_100k_104ef_104fb[] = { |
| 249 | {1758, -40}, |
| 250 | {1742, -35}, |
| 251 | {1719, -30}, |
| 252 | {1691, -25}, |
| 253 | {1654, -20}, |
| 254 | {1608, -15}, |
| 255 | {1551, -10}, |
| 256 | {1483, -5}, |
| 257 | {1404, 0}, |
| 258 | {1315, 5}, |
| 259 | {1218, 10}, |
| 260 | {1114, 15}, |
| 261 | {1007, 20}, |
| 262 | {900, 25}, |
| 263 | {795, 30}, |
| 264 | {696, 35}, |
| 265 | {605, 40}, |
| 266 | {522, 45}, |
| 267 | {448, 50}, |
| 268 | {383, 55}, |
| 269 | {327, 60}, |
| 270 | {278, 65}, |
| 271 | {237, 70}, |
| 272 | {202, 75}, |
| 273 | {172, 80}, |
| 274 | {146, 85}, |
| 275 | {125, 90}, |
| 276 | {107, 95}, |
| 277 | {92, 100}, |
| 278 | {79, 105}, |
| 279 | {68, 110}, |
| 280 | {59, 115}, |
| 281 | {51, 120}, |
| 282 | {44, 125} |
| 283 | }; |
| 284 | |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 285 | static int vadc_read(struct vadc_priv *vadc, u16 offset, u8 *data) |
| 286 | { |
| 287 | return regmap_bulk_read(vadc->regmap, vadc->base + offset, data, 1); |
| 288 | } |
| 289 | |
| 290 | static int vadc_write(struct vadc_priv *vadc, u16 offset, u8 data) |
| 291 | { |
| 292 | return regmap_write(vadc->regmap, vadc->base + offset, data); |
| 293 | } |
| 294 | |
| 295 | static int vadc_reset(struct vadc_priv *vadc) |
| 296 | { |
| 297 | u8 data; |
| 298 | int ret; |
| 299 | |
| 300 | ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA); |
| 301 | if (ret) |
| 302 | return ret; |
| 303 | |
| 304 | ret = vadc_read(vadc, VADC_PERH_RESET_CTL3, &data); |
| 305 | if (ret) |
| 306 | return ret; |
| 307 | |
| 308 | ret = vadc_write(vadc, VADC_ACCESS, VADC_ACCESS_DATA); |
| 309 | if (ret) |
| 310 | return ret; |
| 311 | |
| 312 | data |= VADC_FOLLOW_WARM_RB; |
| 313 | |
| 314 | return vadc_write(vadc, VADC_PERH_RESET_CTL3, data); |
| 315 | } |
| 316 | |
| 317 | static int vadc_set_state(struct vadc_priv *vadc, bool state) |
| 318 | { |
| 319 | return vadc_write(vadc, VADC_EN_CTL1, state ? VADC_EN_CTL1_SET : 0); |
| 320 | } |
| 321 | |
| 322 | static void vadc_show_status(struct vadc_priv *vadc) |
| 323 | { |
| 324 | u8 mode, sta1, chan, dig, en, req; |
| 325 | int ret; |
| 326 | |
| 327 | ret = vadc_read(vadc, VADC_MODE_CTL, &mode); |
| 328 | if (ret) |
| 329 | return; |
| 330 | |
| 331 | ret = vadc_read(vadc, VADC_ADC_DIG_PARAM, &dig); |
| 332 | if (ret) |
| 333 | return; |
| 334 | |
| 335 | ret = vadc_read(vadc, VADC_ADC_CH_SEL_CTL, &chan); |
| 336 | if (ret) |
| 337 | return; |
| 338 | |
| 339 | ret = vadc_read(vadc, VADC_CONV_REQ, &req); |
| 340 | if (ret) |
| 341 | return; |
| 342 | |
| 343 | ret = vadc_read(vadc, VADC_STATUS1, &sta1); |
| 344 | if (ret) |
| 345 | return; |
| 346 | |
| 347 | ret = vadc_read(vadc, VADC_EN_CTL1, &en); |
| 348 | if (ret) |
| 349 | return; |
| 350 | |
| 351 | dev_err(vadc->dev, |
| 352 | "mode:%02x en:%02x chan:%02x dig:%02x req:%02x sta1:%02x\n", |
| 353 | mode, en, chan, dig, req, sta1); |
| 354 | } |
| 355 | |
| 356 | static int vadc_configure(struct vadc_priv *vadc, |
| 357 | struct vadc_channel_prop *prop) |
| 358 | { |
| 359 | u8 decimation, mode_ctrl; |
| 360 | int ret; |
| 361 | |
| 362 | /* Mode selection */ |
| 363 | mode_ctrl = (VADC_OP_MODE_NORMAL << VADC_OP_MODE_SHIFT) | |
| 364 | VADC_ADC_TRIM_EN | VADC_AMUX_TRIM_EN; |
| 365 | ret = vadc_write(vadc, VADC_MODE_CTL, mode_ctrl); |
| 366 | if (ret) |
| 367 | return ret; |
| 368 | |
| 369 | /* Channel selection */ |
| 370 | ret = vadc_write(vadc, VADC_ADC_CH_SEL_CTL, prop->channel); |
| 371 | if (ret) |
| 372 | return ret; |
| 373 | |
| 374 | /* Digital parameter setup */ |
| 375 | decimation = prop->decimation << VADC_ADC_DIG_DEC_RATIO_SEL_SHIFT; |
| 376 | ret = vadc_write(vadc, VADC_ADC_DIG_PARAM, decimation); |
| 377 | if (ret) |
| 378 | return ret; |
| 379 | |
| 380 | /* HW settle time delay */ |
| 381 | ret = vadc_write(vadc, VADC_HW_SETTLE_DELAY, prop->hw_settle_time); |
| 382 | if (ret) |
| 383 | return ret; |
| 384 | |
| 385 | ret = vadc_write(vadc, VADC_FAST_AVG_CTL, prop->avg_samples); |
| 386 | if (ret) |
| 387 | return ret; |
| 388 | |
| 389 | if (prop->avg_samples) |
| 390 | ret = vadc_write(vadc, VADC_FAST_AVG_EN, VADC_FAST_AVG_EN_SET); |
| 391 | else |
| 392 | ret = vadc_write(vadc, VADC_FAST_AVG_EN, 0); |
| 393 | |
| 394 | return ret; |
| 395 | } |
| 396 | |
| 397 | static int vadc_poll_wait_eoc(struct vadc_priv *vadc, unsigned int interval_us) |
| 398 | { |
| 399 | unsigned int count, retry; |
| 400 | u8 sta1; |
| 401 | int ret; |
| 402 | |
| 403 | retry = interval_us / VADC_CONV_TIME_MIN_US; |
| 404 | |
| 405 | for (count = 0; count < retry; count++) { |
| 406 | ret = vadc_read(vadc, VADC_STATUS1, &sta1); |
| 407 | if (ret) |
| 408 | return ret; |
| 409 | |
| 410 | sta1 &= VADC_STATUS1_REQ_STS_EOC_MASK; |
| 411 | if (sta1 == VADC_STATUS1_EOC) |
| 412 | return 0; |
| 413 | |
| 414 | usleep_range(VADC_CONV_TIME_MIN_US, VADC_CONV_TIME_MAX_US); |
| 415 | } |
| 416 | |
| 417 | vadc_show_status(vadc); |
| 418 | |
| 419 | return -ETIMEDOUT; |
| 420 | } |
| 421 | |
| 422 | static int vadc_read_result(struct vadc_priv *vadc, u16 *data) |
| 423 | { |
| 424 | int ret; |
| 425 | |
| 426 | ret = regmap_bulk_read(vadc->regmap, vadc->base + VADC_DATA, data, 2); |
| 427 | if (ret) |
| 428 | return ret; |
| 429 | |
| 430 | *data = clamp_t(u16, *data, VADC_MIN_ADC_CODE, VADC_MAX_ADC_CODE); |
| 431 | |
| 432 | return 0; |
| 433 | } |
| 434 | |
| 435 | static struct vadc_channel_prop *vadc_get_channel(struct vadc_priv *vadc, |
| 436 | unsigned int num) |
| 437 | { |
| 438 | unsigned int i; |
| 439 | |
| 440 | for (i = 0; i < vadc->nchannels; i++) |
| 441 | if (vadc->chan_props[i].channel == num) |
| 442 | return &vadc->chan_props[i]; |
| 443 | |
| 444 | dev_dbg(vadc->dev, "no such channel %02x\n", num); |
| 445 | |
| 446 | return NULL; |
| 447 | } |
| 448 | |
| 449 | static int vadc_do_conversion(struct vadc_priv *vadc, |
| 450 | struct vadc_channel_prop *prop, u16 *data) |
| 451 | { |
| 452 | unsigned int timeout; |
| 453 | int ret; |
| 454 | |
| 455 | mutex_lock(&vadc->lock); |
| 456 | |
| 457 | ret = vadc_configure(vadc, prop); |
| 458 | if (ret) |
| 459 | goto unlock; |
| 460 | |
| 461 | if (!vadc->poll_eoc) |
| 462 | reinit_completion(&vadc->complete); |
| 463 | |
| 464 | ret = vadc_set_state(vadc, true); |
| 465 | if (ret) |
| 466 | goto unlock; |
| 467 | |
| 468 | ret = vadc_write(vadc, VADC_CONV_REQ, VADC_CONV_REQ_SET); |
| 469 | if (ret) |
| 470 | goto err_disable; |
| 471 | |
| 472 | timeout = BIT(prop->avg_samples) * VADC_CONV_TIME_MIN_US * 2; |
| 473 | |
| 474 | if (vadc->poll_eoc) { |
| 475 | ret = vadc_poll_wait_eoc(vadc, timeout); |
| 476 | } else { |
| 477 | ret = wait_for_completion_timeout(&vadc->complete, timeout); |
| 478 | if (!ret) { |
| 479 | ret = -ETIMEDOUT; |
| 480 | goto err_disable; |
| 481 | } |
| 482 | |
| 483 | /* Double check conversion status */ |
| 484 | ret = vadc_poll_wait_eoc(vadc, VADC_CONV_TIME_MIN_US); |
| 485 | if (ret) |
| 486 | goto err_disable; |
| 487 | } |
| 488 | |
| 489 | ret = vadc_read_result(vadc, data); |
| 490 | |
| 491 | err_disable: |
| 492 | vadc_set_state(vadc, false); |
| 493 | if (ret) |
| 494 | dev_err(vadc->dev, "conversion failed\n"); |
| 495 | unlock: |
| 496 | mutex_unlock(&vadc->lock); |
| 497 | return ret; |
| 498 | } |
| 499 | |
| 500 | static int vadc_measure_ref_points(struct vadc_priv *vadc) |
| 501 | { |
| 502 | struct vadc_channel_prop *prop; |
| 503 | u16 read_1, read_2; |
| 504 | int ret; |
| 505 | |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 506 | vadc->graph[VADC_CALIB_RATIOMETRIC].dx = VADC_RATIOMETRIC_RANGE; |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 507 | vadc->graph[VADC_CALIB_ABSOLUTE].dx = VADC_ABSOLUTE_RANGE_UV; |
| 508 | |
| 509 | prop = vadc_get_channel(vadc, VADC_REF_1250MV); |
| 510 | ret = vadc_do_conversion(vadc, prop, &read_1); |
| 511 | if (ret) |
| 512 | goto err; |
| 513 | |
| 514 | /* Try with buffered 625mV channel first */ |
| 515 | prop = vadc_get_channel(vadc, VADC_SPARE1); |
| 516 | if (!prop) |
| 517 | prop = vadc_get_channel(vadc, VADC_REF_625MV); |
| 518 | |
| 519 | ret = vadc_do_conversion(vadc, prop, &read_2); |
| 520 | if (ret) |
| 521 | goto err; |
| 522 | |
| 523 | if (read_1 == read_2) { |
| 524 | ret = -EINVAL; |
| 525 | goto err; |
| 526 | } |
| 527 | |
| 528 | vadc->graph[VADC_CALIB_ABSOLUTE].dy = read_1 - read_2; |
| 529 | vadc->graph[VADC_CALIB_ABSOLUTE].gnd = read_2; |
| 530 | |
| 531 | /* Ratiometric calibration */ |
| 532 | prop = vadc_get_channel(vadc, VADC_VDD_VADC); |
| 533 | ret = vadc_do_conversion(vadc, prop, &read_1); |
| 534 | if (ret) |
| 535 | goto err; |
| 536 | |
| 537 | prop = vadc_get_channel(vadc, VADC_GND_REF); |
| 538 | ret = vadc_do_conversion(vadc, prop, &read_2); |
| 539 | if (ret) |
| 540 | goto err; |
| 541 | |
| 542 | if (read_1 == read_2) { |
| 543 | ret = -EINVAL; |
| 544 | goto err; |
| 545 | } |
| 546 | |
| 547 | vadc->graph[VADC_CALIB_RATIOMETRIC].dy = read_1 - read_2; |
| 548 | vadc->graph[VADC_CALIB_RATIOMETRIC].gnd = read_2; |
| 549 | err: |
| 550 | if (ret) |
| 551 | dev_err(vadc->dev, "measure reference points failed\n"); |
| 552 | |
| 553 | return ret; |
| 554 | } |
| 555 | |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 556 | static int vadc_map_voltage_temp(const struct vadc_map_pt *pts, |
| 557 | u32 tablesize, s32 input, s64 *output) |
| 558 | { |
| 559 | bool descending = 1; |
| 560 | u32 i = 0; |
| 561 | |
| 562 | if (!pts) |
| 563 | return -EINVAL; |
| 564 | |
| 565 | /* Check if table is descending or ascending */ |
| 566 | if (tablesize > 1) { |
| 567 | if (pts[0].x < pts[1].x) |
| 568 | descending = 0; |
| 569 | } |
| 570 | |
| 571 | while (i < tablesize) { |
| 572 | if ((descending) && (pts[i].x < input)) { |
| 573 | /* table entry is less than measured*/ |
| 574 | /* value and table is descending, stop */ |
| 575 | break; |
| 576 | } else if ((!descending) && |
| 577 | (pts[i].x > input)) { |
| 578 | /* table entry is greater than measured*/ |
| 579 | /*value and table is ascending, stop */ |
| 580 | break; |
| 581 | } |
| 582 | i++; |
| 583 | } |
| 584 | |
| 585 | if (i == 0) { |
| 586 | *output = pts[0].y; |
| 587 | } else if (i == tablesize) { |
| 588 | *output = pts[tablesize - 1].y; |
| 589 | } else { |
| 590 | /* result is between search_index and search_index-1 */ |
| 591 | /* interpolate linearly */ |
| 592 | *output = (((s32)((pts[i].y - pts[i - 1].y) * |
| 593 | (input - pts[i - 1].x)) / |
| 594 | (pts[i].x - pts[i - 1].x)) + |
| 595 | pts[i - 1].y); |
| 596 | } |
| 597 | |
| 598 | return 0; |
| 599 | } |
| 600 | |
Rama Krishna Phani A | ba71704 | 2016-12-09 20:31:49 +0530 | [diff] [blame] | 601 | static void vadc_scale_calib(struct vadc_priv *vadc, u16 adc_code, |
| 602 | const struct vadc_channel_prop *prop, |
| 603 | s64 *scale_voltage) |
| 604 | { |
| 605 | *scale_voltage = (adc_code - |
| 606 | vadc->graph[prop->calibration].gnd); |
| 607 | *scale_voltage *= vadc->graph[prop->calibration].dx; |
| 608 | *scale_voltage = div64_s64(*scale_voltage, |
| 609 | vadc->graph[prop->calibration].dy); |
| 610 | if (prop->calibration == VADC_CALIB_ABSOLUTE) |
| 611 | *scale_voltage += |
| 612 | vadc->graph[prop->calibration].dx; |
| 613 | |
| 614 | if (*scale_voltage < 0) |
| 615 | *scale_voltage = 0; |
| 616 | } |
| 617 | |
| 618 | static int vadc_scale_volt(struct vadc_priv *vadc, |
| 619 | const struct vadc_channel_prop *prop, u16 adc_code, |
| 620 | int *result_uv) |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 621 | { |
| 622 | const struct vadc_prescale_ratio *prescale; |
Rama Krishna Phani A | ba71704 | 2016-12-09 20:31:49 +0530 | [diff] [blame] | 623 | s64 voltage = 0, result = 0; |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 624 | |
Rama Krishna Phani A | ba71704 | 2016-12-09 20:31:49 +0530 | [diff] [blame] | 625 | vadc_scale_calib(vadc, adc_code, prop, &voltage); |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 626 | |
| 627 | prescale = &vadc_prescale_ratios[prop->prescale]; |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 628 | voltage = voltage * prescale->den; |
Rama Krishna Phani A | ba71704 | 2016-12-09 20:31:49 +0530 | [diff] [blame] | 629 | result = div64_s64(voltage, prescale->num); |
| 630 | *result_uv = result; |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 631 | |
Rama Krishna Phani A | ba71704 | 2016-12-09 20:31:49 +0530 | [diff] [blame] | 632 | return 0; |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 633 | } |
| 634 | |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 635 | static int vadc_scale_therm(struct vadc_priv *vadc, |
| 636 | const struct vadc_channel_prop *prop, u16 adc_code, |
| 637 | int *result_mdec) |
| 638 | { |
| 639 | s64 voltage = 0, result = 0; |
| 640 | |
| 641 | vadc_scale_calib(vadc, adc_code, prop, &voltage); |
| 642 | |
| 643 | if (prop->calibration == VADC_CALIB_ABSOLUTE) |
| 644 | voltage /= 1000; |
| 645 | |
| 646 | vadc_map_voltage_temp(adcmap_100k_104ef_104fb, |
| 647 | ARRAY_SIZE(adcmap_100k_104ef_104fb), |
| 648 | voltage, &result); |
| 649 | result *= 1000; |
| 650 | *result_mdec = result; |
| 651 | |
| 652 | return 0; |
| 653 | } |
| 654 | |
| 655 | static int vadc_scale_die_temp(struct vadc_priv *vadc, |
| 656 | const struct vadc_channel_prop *prop, |
| 657 | u16 adc_code, int *result_mdec) |
| 658 | { |
| 659 | const struct vadc_prescale_ratio *prescale; |
| 660 | s64 voltage = 0; |
| 661 | |
| 662 | vadc_scale_calib(vadc, adc_code, prop, &voltage); |
| 663 | |
| 664 | if (voltage > 0) { |
| 665 | prescale = &vadc_prescale_ratios[prop->prescale]; |
| 666 | voltage = voltage * prescale->den; |
| 667 | voltage /= (prescale->num * 2); |
| 668 | } else { |
| 669 | voltage = 0; |
| 670 | } |
| 671 | |
| 672 | voltage -= KELVINMIL_CELSIUSMIL; |
| 673 | *result_mdec = voltage; |
| 674 | |
| 675 | return 0; |
| 676 | } |
| 677 | |
| 678 | static int vadc_scale_chg_temp(struct vadc_priv *vadc, |
| 679 | const struct vadc_channel_prop *prop, |
| 680 | u16 adc_code, int *result_mdec) |
| 681 | { |
| 682 | const struct vadc_prescale_ratio *prescale; |
| 683 | s64 voltage = 0, result = 0; |
| 684 | |
| 685 | vadc_scale_calib(vadc, adc_code, prop, &voltage); |
| 686 | |
| 687 | prescale = &vadc_prescale_ratios[prop->prescale]; |
| 688 | voltage = voltage * prescale->den; |
| 689 | voltage = div64_s64(voltage, prescale->num); |
| 690 | voltage = ((PMI_CHG_SCALE_1) * (voltage * 2)); |
| 691 | voltage = (voltage + PMI_CHG_SCALE_2); |
| 692 | result = div64_s64(voltage, 1000000); |
| 693 | *result_mdec = result; |
| 694 | |
| 695 | return 0; |
| 696 | } |
| 697 | |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 698 | static int vadc_decimation_from_dt(u32 value) |
| 699 | { |
| 700 | if (!is_power_of_2(value) || value < VADC_DECIMATION_MIN || |
| 701 | value > VADC_DECIMATION_MAX) |
| 702 | return -EINVAL; |
| 703 | |
| 704 | return __ffs64(value / VADC_DECIMATION_MIN); |
| 705 | } |
| 706 | |
| 707 | static int vadc_prescaling_from_dt(u32 num, u32 den) |
| 708 | { |
| 709 | unsigned int pre; |
| 710 | |
| 711 | for (pre = 0; pre < ARRAY_SIZE(vadc_prescale_ratios); pre++) |
| 712 | if (vadc_prescale_ratios[pre].num == num && |
| 713 | vadc_prescale_ratios[pre].den == den) |
| 714 | break; |
| 715 | |
| 716 | if (pre == ARRAY_SIZE(vadc_prescale_ratios)) |
| 717 | return -EINVAL; |
| 718 | |
| 719 | return pre; |
| 720 | } |
| 721 | |
| 722 | static int vadc_hw_settle_time_from_dt(u32 value) |
| 723 | { |
| 724 | if ((value <= 1000 && value % 100) || (value > 1000 && value % 2000)) |
| 725 | return -EINVAL; |
| 726 | |
| 727 | if (value <= 1000) |
| 728 | value /= 100; |
| 729 | else |
| 730 | value = value / 2000 + 10; |
| 731 | |
| 732 | return value; |
| 733 | } |
| 734 | |
| 735 | static int vadc_avg_samples_from_dt(u32 value) |
| 736 | { |
| 737 | if (!is_power_of_2(value) || value > VADC_AVG_SAMPLES_MAX) |
| 738 | return -EINVAL; |
| 739 | |
| 740 | return __ffs64(value); |
| 741 | } |
| 742 | |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 743 | static struct vadc_scale_fn scale_fn[] = { |
| 744 | [SCALE_DEFAULT] = {vadc_scale_volt}, |
| 745 | [SCALE_THERM_100K_PULLUP] = {vadc_scale_therm}, |
| 746 | [SCALE_PMIC_THERM] = {vadc_scale_die_temp}, |
| 747 | [SCALE_XOTHERM] = {vadc_scale_therm}, |
| 748 | [SCALE_PMI_CHG_TEMP] = {vadc_scale_chg_temp}, |
| 749 | }; |
| 750 | |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 751 | static int vadc_read_raw(struct iio_dev *indio_dev, |
| 752 | struct iio_chan_spec const *chan, int *val, int *val2, |
| 753 | long mask) |
| 754 | { |
| 755 | struct vadc_priv *vadc = iio_priv(indio_dev); |
| 756 | struct vadc_channel_prop *prop; |
| 757 | u16 adc_code; |
| 758 | int ret; |
| 759 | |
| 760 | switch (mask) { |
| 761 | case IIO_CHAN_INFO_PROCESSED: |
| 762 | prop = &vadc->chan_props[chan->address]; |
| 763 | ret = vadc_do_conversion(vadc, prop, &adc_code); |
| 764 | if (ret) |
| 765 | break; |
| 766 | |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 767 | scale_fn[prop->scale_fn].scale(vadc, prop, adc_code, val); |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 768 | |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 769 | return IIO_VAL_INT; |
| 770 | case IIO_CHAN_INFO_RAW: |
| 771 | prop = &vadc->chan_props[chan->address]; |
| 772 | ret = vadc_do_conversion(vadc, prop, &adc_code); |
| 773 | if (ret) |
| 774 | break; |
| 775 | |
Rama Krishna Phani A | ba71704 | 2016-12-09 20:31:49 +0530 | [diff] [blame] | 776 | *val = (int)adc_code; |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 777 | return IIO_VAL_INT; |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 778 | default: |
| 779 | ret = -EINVAL; |
| 780 | break; |
| 781 | } |
| 782 | |
| 783 | return ret; |
| 784 | } |
| 785 | |
| 786 | static int vadc_of_xlate(struct iio_dev *indio_dev, |
| 787 | const struct of_phandle_args *iiospec) |
| 788 | { |
| 789 | struct vadc_priv *vadc = iio_priv(indio_dev); |
| 790 | unsigned int i; |
| 791 | |
| 792 | for (i = 0; i < vadc->nchannels; i++) |
| 793 | if (vadc->iio_chans[i].channel == iiospec->args[0]) |
| 794 | return i; |
| 795 | |
| 796 | return -EINVAL; |
| 797 | } |
| 798 | |
| 799 | static const struct iio_info vadc_info = { |
| 800 | .read_raw = vadc_read_raw, |
| 801 | .of_xlate = vadc_of_xlate, |
| 802 | .driver_module = THIS_MODULE, |
| 803 | }; |
| 804 | |
| 805 | struct vadc_channels { |
| 806 | const char *datasheet_name; |
| 807 | unsigned int prescale_index; |
| 808 | enum iio_chan_type type; |
| 809 | long info_mask; |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 810 | unsigned int scale_fn; |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 811 | }; |
| 812 | |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 813 | #define VADC_CHAN(_dname, _type, _mask, _pre, _scale) \ |
| 814 | [VADC_##_dname] = { \ |
| 815 | .datasheet_name = __stringify(_dname), \ |
| 816 | .prescale_index = _pre, \ |
| 817 | .type = _type, \ |
| 818 | .info_mask = _mask, \ |
| 819 | .scale_fn = _scale \ |
| 820 | }, \ |
| 821 | |
| 822 | #define VADC_NO_CHAN(_dname, _type, _mask, _pre) \ |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 823 | [VADC_##_dname] = { \ |
| 824 | .datasheet_name = __stringify(_dname), \ |
| 825 | .prescale_index = _pre, \ |
| 826 | .type = _type, \ |
| 827 | .info_mask = _mask \ |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 828 | }, |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 829 | |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 830 | #define VADC_CHAN_TEMP(_dname, _pre, _scale) \ |
| 831 | VADC_CHAN(_dname, IIO_TEMP, \ |
| 832 | BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED), \ |
| 833 | _pre, _scale) \ |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 834 | |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 835 | #define VADC_CHAN_VOLT(_dname, _pre, _scale) \ |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 836 | VADC_CHAN(_dname, IIO_VOLTAGE, \ |
Rama Krishna Phani A | ba71704 | 2016-12-09 20:31:49 +0530 | [diff] [blame] | 837 | BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_PROCESSED),\ |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 838 | _pre, _scale) \ |
| 839 | |
| 840 | #define VADC_CHAN_NO_SCALE(_dname, _pre) \ |
| 841 | VADC_NO_CHAN(_dname, IIO_VOLTAGE, \ |
| 842 | BIT(IIO_CHAN_INFO_RAW), \ |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 843 | _pre) \ |
| 844 | |
| 845 | /* |
| 846 | * The array represents all possible ADC channels found in the supported PMICs. |
| 847 | * Every index in the array is equal to the channel number per datasheet. The |
| 848 | * gaps in the array should be treated as reserved channels. |
| 849 | */ |
| 850 | static const struct vadc_channels vadc_chans[] = { |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 851 | VADC_CHAN_VOLT(USBIN, 4, SCALE_DEFAULT) |
| 852 | VADC_CHAN_VOLT(DCIN, 4, SCALE_DEFAULT) |
| 853 | VADC_CHAN_NO_SCALE(VCHG_SNS, 3) |
| 854 | VADC_CHAN_NO_SCALE(SPARE1_03, 1) |
| 855 | VADC_CHAN_NO_SCALE(USB_ID_MV, 1) |
| 856 | VADC_CHAN_VOLT(VCOIN, 1, SCALE_DEFAULT) |
| 857 | VADC_CHAN_NO_SCALE(VBAT_SNS, 1) |
| 858 | VADC_CHAN_VOLT(VSYS, 1, SCALE_DEFAULT) |
| 859 | VADC_CHAN_TEMP(DIE_TEMP, 0, SCALE_PMIC_THERM) |
| 860 | VADC_CHAN_VOLT(REF_625MV, 0, SCALE_DEFAULT) |
| 861 | VADC_CHAN_VOLT(REF_1250MV, 0, SCALE_DEFAULT) |
| 862 | VADC_CHAN_NO_SCALE(CHG_TEMP, 0) |
| 863 | VADC_CHAN_NO_SCALE(SPARE1, 0) |
| 864 | VADC_CHAN_TEMP(SPARE2, 0, SCALE_PMI_CHG_TEMP) |
| 865 | VADC_CHAN_VOLT(GND_REF, 0, SCALE_DEFAULT) |
| 866 | VADC_CHAN_VOLT(VDD_VADC, 0, SCALE_DEFAULT) |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 867 | |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 868 | VADC_CHAN_NO_SCALE(P_MUX1_1_1, 0) |
| 869 | VADC_CHAN_NO_SCALE(P_MUX2_1_1, 0) |
| 870 | VADC_CHAN_NO_SCALE(P_MUX3_1_1, 0) |
| 871 | VADC_CHAN_NO_SCALE(P_MUX4_1_1, 0) |
| 872 | VADC_CHAN_NO_SCALE(P_MUX5_1_1, 0) |
| 873 | VADC_CHAN_NO_SCALE(P_MUX6_1_1, 0) |
| 874 | VADC_CHAN_NO_SCALE(P_MUX7_1_1, 0) |
| 875 | VADC_CHAN_NO_SCALE(P_MUX8_1_1, 0) |
| 876 | VADC_CHAN_NO_SCALE(P_MUX9_1_1, 0) |
| 877 | VADC_CHAN_NO_SCALE(P_MUX10_1_1, 0) |
| 878 | VADC_CHAN_NO_SCALE(P_MUX11_1_1, 0) |
| 879 | VADC_CHAN_NO_SCALE(P_MUX12_1_1, 0) |
| 880 | VADC_CHAN_NO_SCALE(P_MUX13_1_1, 0) |
| 881 | VADC_CHAN_NO_SCALE(P_MUX14_1_1, 0) |
| 882 | VADC_CHAN_NO_SCALE(P_MUX15_1_1, 0) |
| 883 | VADC_CHAN_NO_SCALE(P_MUX16_1_1, 0) |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 884 | |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 885 | VADC_CHAN_NO_SCALE(P_MUX1_1_3, 1) |
| 886 | VADC_CHAN_NO_SCALE(P_MUX2_1_3, 1) |
| 887 | VADC_CHAN_NO_SCALE(P_MUX3_1_3, 1) |
| 888 | VADC_CHAN_NO_SCALE(P_MUX4_1_3, 1) |
| 889 | VADC_CHAN_NO_SCALE(P_MUX5_1_3, 1) |
| 890 | VADC_CHAN_NO_SCALE(P_MUX6_1_3, 1) |
| 891 | VADC_CHAN_NO_SCALE(P_MUX7_1_3, 1) |
| 892 | VADC_CHAN_NO_SCALE(P_MUX8_1_3, 1) |
| 893 | VADC_CHAN_NO_SCALE(P_MUX9_1_3, 1) |
| 894 | VADC_CHAN_NO_SCALE(P_MUX10_1_3, 1) |
| 895 | VADC_CHAN_NO_SCALE(P_MUX11_1_3, 1) |
| 896 | VADC_CHAN_NO_SCALE(P_MUX12_1_3, 1) |
| 897 | VADC_CHAN_NO_SCALE(P_MUX13_1_3, 1) |
| 898 | VADC_CHAN_NO_SCALE(P_MUX14_1_3, 1) |
| 899 | VADC_CHAN_NO_SCALE(P_MUX15_1_3, 1) |
| 900 | VADC_CHAN_NO_SCALE(P_MUX16_1_3, 1) |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 901 | |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 902 | VADC_CHAN_NO_SCALE(LR_MUX1_BAT_THERM, 0) |
| 903 | VADC_CHAN_NO_SCALE(LR_MUX2_BAT_ID, 0) |
| 904 | VADC_CHAN_NO_SCALE(LR_MUX3_XO_THERM, 0) |
| 905 | VADC_CHAN_NO_SCALE(LR_MUX4_AMUX_THM1, 0) |
| 906 | VADC_CHAN_NO_SCALE(LR_MUX5_AMUX_THM2, 0) |
| 907 | VADC_CHAN_NO_SCALE(LR_MUX6_AMUX_THM3, 0) |
| 908 | VADC_CHAN_NO_SCALE(LR_MUX7_HW_ID, 0) |
| 909 | VADC_CHAN_NO_SCALE(LR_MUX8_AMUX_THM4, 0) |
| 910 | VADC_CHAN_NO_SCALE(LR_MUX9_AMUX_THM5, 0) |
| 911 | VADC_CHAN_NO_SCALE(LR_MUX10_USB_ID, 0) |
| 912 | VADC_CHAN_NO_SCALE(AMUX_PU1, 0) |
| 913 | VADC_CHAN_NO_SCALE(AMUX_PU2, 0) |
| 914 | VADC_CHAN_NO_SCALE(LR_MUX3_BUF_XO_THERM, 0) |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 915 | |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 916 | VADC_CHAN_NO_SCALE(LR_MUX1_PU1_BAT_THERM, 0) |
| 917 | VADC_CHAN_NO_SCALE(LR_MUX2_PU1_BAT_ID, 0) |
| 918 | VADC_CHAN_NO_SCALE(LR_MUX3_PU1_XO_THERM, 0) |
| 919 | VADC_CHAN_TEMP(LR_MUX4_PU1_AMUX_THM1, 0, SCALE_THERM_100K_PULLUP) |
| 920 | VADC_CHAN_TEMP(LR_MUX5_PU1_AMUX_THM2, 0, SCALE_THERM_100K_PULLUP) |
| 921 | VADC_CHAN_TEMP(LR_MUX6_PU1_AMUX_THM3, 0, SCALE_THERM_100K_PULLUP) |
| 922 | VADC_CHAN_NO_SCALE(LR_MUX7_PU1_AMUX_HW_ID, 0) |
| 923 | VADC_CHAN_TEMP(LR_MUX8_PU1_AMUX_THM4, 0, SCALE_THERM_100K_PULLUP) |
| 924 | VADC_CHAN_TEMP(LR_MUX9_PU1_AMUX_THM5, 0, SCALE_THERM_100K_PULLUP) |
| 925 | VADC_CHAN_NO_SCALE(LR_MUX10_PU1_AMUX_USB_ID, 0) |
| 926 | VADC_CHAN_TEMP(LR_MUX3_BUF_PU1_XO_THERM, 0, SCALE_XOTHERM) |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 927 | |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 928 | VADC_CHAN_NO_SCALE(LR_MUX1_PU2_BAT_THERM, 0) |
| 929 | VADC_CHAN_NO_SCALE(LR_MUX2_PU2_BAT_ID, 0) |
| 930 | VADC_CHAN_NO_SCALE(LR_MUX3_PU2_XO_THERM, 0) |
| 931 | VADC_CHAN_NO_SCALE(LR_MUX4_PU2_AMUX_THM1, 0) |
| 932 | VADC_CHAN_NO_SCALE(LR_MUX5_PU2_AMUX_THM2, 0) |
| 933 | VADC_CHAN_NO_SCALE(LR_MUX6_PU2_AMUX_THM3, 0) |
| 934 | VADC_CHAN_NO_SCALE(LR_MUX7_PU2_AMUX_HW_ID, 0) |
| 935 | VADC_CHAN_NO_SCALE(LR_MUX8_PU2_AMUX_THM4, 0) |
| 936 | VADC_CHAN_NO_SCALE(LR_MUX9_PU2_AMUX_THM5, 0) |
| 937 | VADC_CHAN_NO_SCALE(LR_MUX10_PU2_AMUX_USB_ID, 0) |
| 938 | VADC_CHAN_NO_SCALE(LR_MUX3_BUF_PU2_XO_THERM, 0) |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 939 | |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 940 | VADC_CHAN_NO_SCALE(LR_MUX1_PU1_PU2_BAT_THERM, 0) |
| 941 | VADC_CHAN_NO_SCALE(LR_MUX2_PU1_PU2_BAT_ID, 0) |
| 942 | VADC_CHAN_NO_SCALE(LR_MUX3_PU1_PU2_XO_THERM, 0) |
| 943 | VADC_CHAN_NO_SCALE(LR_MUX4_PU1_PU2_AMUX_THM1, 0) |
| 944 | VADC_CHAN_NO_SCALE(LR_MUX5_PU1_PU2_AMUX_THM2, 0) |
| 945 | VADC_CHAN_NO_SCALE(LR_MUX6_PU1_PU2_AMUX_THM3, 0) |
| 946 | VADC_CHAN_NO_SCALE(LR_MUX7_PU1_PU2_AMUX_HW_ID, 0) |
| 947 | VADC_CHAN_NO_SCALE(LR_MUX8_PU1_PU2_AMUX_THM4, 0) |
| 948 | VADC_CHAN_NO_SCALE(LR_MUX9_PU1_PU2_AMUX_THM5, 0) |
| 949 | VADC_CHAN_NO_SCALE(LR_MUX10_PU1_PU2_AMUX_USB_ID, 0) |
| 950 | VADC_CHAN_NO_SCALE(LR_MUX3_BUF_PU1_PU2_XO_THERM, 0) |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 951 | }; |
| 952 | |
| 953 | static int vadc_get_dt_channel_data(struct device *dev, |
| 954 | struct vadc_channel_prop *prop, |
| 955 | struct device_node *node) |
| 956 | { |
| 957 | const char *name = node->name; |
| 958 | u32 chan, value, varr[2]; |
| 959 | int ret; |
| 960 | |
| 961 | ret = of_property_read_u32(node, "reg", &chan); |
| 962 | if (ret) { |
| 963 | dev_err(dev, "invalid channel number %s\n", name); |
| 964 | return ret; |
| 965 | } |
| 966 | |
| 967 | if (chan > VADC_CHAN_MAX || chan < VADC_CHAN_MIN) { |
| 968 | dev_err(dev, "%s invalid channel number %d\n", name, chan); |
| 969 | return -EINVAL; |
| 970 | } |
| 971 | |
| 972 | /* the channel has DT description */ |
| 973 | prop->channel = chan; |
| 974 | |
| 975 | ret = of_property_read_u32(node, "qcom,decimation", &value); |
| 976 | if (!ret) { |
| 977 | ret = vadc_decimation_from_dt(value); |
| 978 | if (ret < 0) { |
| 979 | dev_err(dev, "%02x invalid decimation %d\n", |
| 980 | chan, value); |
| 981 | return ret; |
| 982 | } |
| 983 | prop->decimation = ret; |
| 984 | } else { |
| 985 | prop->decimation = VADC_DEF_DECIMATION; |
| 986 | } |
| 987 | |
| 988 | ret = of_property_read_u32_array(node, "qcom,pre-scaling", varr, 2); |
| 989 | if (!ret) { |
| 990 | ret = vadc_prescaling_from_dt(varr[0], varr[1]); |
| 991 | if (ret < 0) { |
| 992 | dev_err(dev, "%02x invalid pre-scaling <%d %d>\n", |
| 993 | chan, varr[0], varr[1]); |
| 994 | return ret; |
| 995 | } |
| 996 | prop->prescale = ret; |
| 997 | } else { |
| 998 | prop->prescale = vadc_chans[prop->channel].prescale_index; |
| 999 | } |
| 1000 | |
| 1001 | ret = of_property_read_u32(node, "qcom,hw-settle-time", &value); |
| 1002 | if (!ret) { |
| 1003 | ret = vadc_hw_settle_time_from_dt(value); |
| 1004 | if (ret < 0) { |
| 1005 | dev_err(dev, "%02x invalid hw-settle-time %d us\n", |
| 1006 | chan, value); |
| 1007 | return ret; |
| 1008 | } |
| 1009 | prop->hw_settle_time = ret; |
| 1010 | } else { |
| 1011 | prop->hw_settle_time = VADC_DEF_HW_SETTLE_TIME; |
| 1012 | } |
| 1013 | |
| 1014 | ret = of_property_read_u32(node, "qcom,avg-samples", &value); |
| 1015 | if (!ret) { |
| 1016 | ret = vadc_avg_samples_from_dt(value); |
| 1017 | if (ret < 0) { |
| 1018 | dev_err(dev, "%02x invalid avg-samples %d\n", |
| 1019 | chan, value); |
| 1020 | return ret; |
| 1021 | } |
| 1022 | prop->avg_samples = ret; |
| 1023 | } else { |
| 1024 | prop->avg_samples = VADC_DEF_AVG_SAMPLES; |
| 1025 | } |
| 1026 | |
| 1027 | if (of_property_read_bool(node, "qcom,ratiometric")) |
| 1028 | prop->calibration = VADC_CALIB_RATIOMETRIC; |
| 1029 | else |
| 1030 | prop->calibration = VADC_CALIB_ABSOLUTE; |
| 1031 | |
| 1032 | dev_dbg(dev, "%02x name %s\n", chan, name); |
| 1033 | |
| 1034 | return 0; |
| 1035 | } |
| 1036 | |
| 1037 | static int vadc_get_dt_data(struct vadc_priv *vadc, struct device_node *node) |
| 1038 | { |
| 1039 | const struct vadc_channels *vadc_chan; |
| 1040 | struct iio_chan_spec *iio_chan; |
| 1041 | struct vadc_channel_prop prop; |
| 1042 | struct device_node *child; |
| 1043 | unsigned int index = 0; |
| 1044 | int ret; |
| 1045 | |
| 1046 | vadc->nchannels = of_get_available_child_count(node); |
| 1047 | if (!vadc->nchannels) |
| 1048 | return -EINVAL; |
| 1049 | |
| 1050 | vadc->iio_chans = devm_kcalloc(vadc->dev, vadc->nchannels, |
| 1051 | sizeof(*vadc->iio_chans), GFP_KERNEL); |
| 1052 | if (!vadc->iio_chans) |
| 1053 | return -ENOMEM; |
| 1054 | |
| 1055 | vadc->chan_props = devm_kcalloc(vadc->dev, vadc->nchannels, |
| 1056 | sizeof(*vadc->chan_props), GFP_KERNEL); |
| 1057 | if (!vadc->chan_props) |
| 1058 | return -ENOMEM; |
| 1059 | |
| 1060 | iio_chan = vadc->iio_chans; |
| 1061 | |
| 1062 | for_each_available_child_of_node(node, child) { |
| 1063 | ret = vadc_get_dt_channel_data(vadc->dev, &prop, child); |
Julia Lawall | d4c65fe | 2015-11-18 23:04:13 +0100 | [diff] [blame] | 1064 | if (ret) { |
| 1065 | of_node_put(child); |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 1066 | return ret; |
Julia Lawall | d4c65fe | 2015-11-18 23:04:13 +0100 | [diff] [blame] | 1067 | } |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 1068 | |
Rama Krishna Phani A | 7c271ee | 2016-12-09 20:31:50 +0530 | [diff] [blame^] | 1069 | prop.scale_fn = vadc_chans[prop.channel].scale_fn; |
Stanimir Varbanov | 0917de9 | 2015-01-20 12:15:22 +0200 | [diff] [blame] | 1070 | vadc->chan_props[index] = prop; |
| 1071 | |
| 1072 | vadc_chan = &vadc_chans[prop.channel]; |
| 1073 | |
| 1074 | iio_chan->channel = prop.channel; |
| 1075 | iio_chan->datasheet_name = vadc_chan->datasheet_name; |
| 1076 | iio_chan->info_mask_separate = vadc_chan->info_mask; |
| 1077 | iio_chan->type = vadc_chan->type; |
| 1078 | iio_chan->indexed = 1; |
| 1079 | iio_chan->address = index++; |
| 1080 | |
| 1081 | iio_chan++; |
| 1082 | } |
| 1083 | |
| 1084 | /* These channels are mandatory, they are used as reference points */ |
| 1085 | if (!vadc_get_channel(vadc, VADC_REF_1250MV)) { |
| 1086 | dev_err(vadc->dev, "Please define 1.25V channel\n"); |
| 1087 | return -ENODEV; |
| 1088 | } |
| 1089 | |
| 1090 | if (!vadc_get_channel(vadc, VADC_REF_625MV)) { |
| 1091 | dev_err(vadc->dev, "Please define 0.625V channel\n"); |
| 1092 | return -ENODEV; |
| 1093 | } |
| 1094 | |
| 1095 | if (!vadc_get_channel(vadc, VADC_VDD_VADC)) { |
| 1096 | dev_err(vadc->dev, "Please define VDD channel\n"); |
| 1097 | return -ENODEV; |
| 1098 | } |
| 1099 | |
| 1100 | if (!vadc_get_channel(vadc, VADC_GND_REF)) { |
| 1101 | dev_err(vadc->dev, "Please define GND channel\n"); |
| 1102 | return -ENODEV; |
| 1103 | } |
| 1104 | |
| 1105 | return 0; |
| 1106 | } |
| 1107 | |
| 1108 | static irqreturn_t vadc_isr(int irq, void *dev_id) |
| 1109 | { |
| 1110 | struct vadc_priv *vadc = dev_id; |
| 1111 | |
| 1112 | complete(&vadc->complete); |
| 1113 | |
| 1114 | return IRQ_HANDLED; |
| 1115 | } |
| 1116 | |
| 1117 | static int vadc_check_revision(struct vadc_priv *vadc) |
| 1118 | { |
| 1119 | u8 val; |
| 1120 | int ret; |
| 1121 | |
| 1122 | ret = vadc_read(vadc, VADC_PERPH_TYPE, &val); |
| 1123 | if (ret) |
| 1124 | return ret; |
| 1125 | |
| 1126 | if (val < VADC_PERPH_TYPE_ADC) { |
| 1127 | dev_err(vadc->dev, "%d is not ADC\n", val); |
| 1128 | return -ENODEV; |
| 1129 | } |
| 1130 | |
| 1131 | ret = vadc_read(vadc, VADC_PERPH_SUBTYPE, &val); |
| 1132 | if (ret) |
| 1133 | return ret; |
| 1134 | |
| 1135 | if (val < VADC_PERPH_SUBTYPE_VADC) { |
| 1136 | dev_err(vadc->dev, "%d is not VADC\n", val); |
| 1137 | return -ENODEV; |
| 1138 | } |
| 1139 | |
| 1140 | ret = vadc_read(vadc, VADC_REVISION2, &val); |
| 1141 | if (ret) |
| 1142 | return ret; |
| 1143 | |
| 1144 | if (val < VADC_REVISION2_SUPPORTED_VADC) { |
| 1145 | dev_err(vadc->dev, "revision %d not supported\n", val); |
| 1146 | return -ENODEV; |
| 1147 | } |
| 1148 | |
| 1149 | return 0; |
| 1150 | } |
| 1151 | |
| 1152 | static int vadc_probe(struct platform_device *pdev) |
| 1153 | { |
| 1154 | struct device_node *node = pdev->dev.of_node; |
| 1155 | struct device *dev = &pdev->dev; |
| 1156 | struct iio_dev *indio_dev; |
| 1157 | struct vadc_priv *vadc; |
| 1158 | struct regmap *regmap; |
| 1159 | int ret, irq_eoc; |
| 1160 | u32 reg; |
| 1161 | |
| 1162 | regmap = dev_get_regmap(dev->parent, NULL); |
| 1163 | if (!regmap) |
| 1164 | return -ENODEV; |
| 1165 | |
| 1166 | ret = of_property_read_u32(node, "reg", ®); |
| 1167 | if (ret < 0) |
| 1168 | return ret; |
| 1169 | |
| 1170 | indio_dev = devm_iio_device_alloc(dev, sizeof(*vadc)); |
| 1171 | if (!indio_dev) |
| 1172 | return -ENOMEM; |
| 1173 | |
| 1174 | vadc = iio_priv(indio_dev); |
| 1175 | vadc->regmap = regmap; |
| 1176 | vadc->dev = dev; |
| 1177 | vadc->base = reg; |
| 1178 | vadc->are_ref_measured = false; |
| 1179 | init_completion(&vadc->complete); |
| 1180 | mutex_init(&vadc->lock); |
| 1181 | |
| 1182 | ret = vadc_check_revision(vadc); |
| 1183 | if (ret) |
| 1184 | return ret; |
| 1185 | |
| 1186 | ret = vadc_get_dt_data(vadc, node); |
| 1187 | if (ret) |
| 1188 | return ret; |
| 1189 | |
| 1190 | irq_eoc = platform_get_irq(pdev, 0); |
| 1191 | if (irq_eoc < 0) { |
| 1192 | if (irq_eoc == -EPROBE_DEFER || irq_eoc == -EINVAL) |
| 1193 | return irq_eoc; |
| 1194 | vadc->poll_eoc = true; |
| 1195 | } else { |
| 1196 | ret = devm_request_irq(dev, irq_eoc, vadc_isr, 0, |
| 1197 | "spmi-vadc", vadc); |
| 1198 | if (ret) |
| 1199 | return ret; |
| 1200 | } |
| 1201 | |
| 1202 | ret = vadc_reset(vadc); |
| 1203 | if (ret) { |
| 1204 | dev_err(dev, "reset failed\n"); |
| 1205 | return ret; |
| 1206 | } |
| 1207 | |
| 1208 | ret = vadc_measure_ref_points(vadc); |
| 1209 | if (ret) |
| 1210 | return ret; |
| 1211 | |
| 1212 | indio_dev->dev.parent = dev; |
| 1213 | indio_dev->dev.of_node = node; |
| 1214 | indio_dev->name = pdev->name; |
| 1215 | indio_dev->modes = INDIO_DIRECT_MODE; |
| 1216 | indio_dev->info = &vadc_info; |
| 1217 | indio_dev->channels = vadc->iio_chans; |
| 1218 | indio_dev->num_channels = vadc->nchannels; |
| 1219 | |
| 1220 | return devm_iio_device_register(dev, indio_dev); |
| 1221 | } |
| 1222 | |
| 1223 | static const struct of_device_id vadc_match_table[] = { |
| 1224 | { .compatible = "qcom,spmi-vadc" }, |
| 1225 | { } |
| 1226 | }; |
| 1227 | MODULE_DEVICE_TABLE(of, vadc_match_table); |
| 1228 | |
| 1229 | static struct platform_driver vadc_driver = { |
| 1230 | .driver = { |
| 1231 | .name = "qcom-spmi-vadc", |
| 1232 | .of_match_table = vadc_match_table, |
| 1233 | }, |
| 1234 | .probe = vadc_probe, |
| 1235 | }; |
| 1236 | module_platform_driver(vadc_driver); |
| 1237 | |
| 1238 | MODULE_ALIAS("platform:qcom-spmi-vadc"); |
| 1239 | MODULE_DESCRIPTION("Qualcomm SPMI PMIC voltage ADC driver"); |
| 1240 | MODULE_LICENSE("GPL v2"); |
| 1241 | MODULE_AUTHOR("Stanimir Varbanov <svarbanov@mm-sol.com>"); |
| 1242 | MODULE_AUTHOR("Ivan T. Ivanov <iivanov@mm-sol.com>"); |