Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 1 | /* |
| 2 | * MS5611 pressure and temperature sensor driver |
| 3 | * |
| 4 | * Copyright (c) Tomasz Duszynski <tduszyns@gmail.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License version 2 as |
| 8 | * published by the Free Software Foundation. |
| 9 | * |
| 10 | * Data sheet: |
| 11 | * http://www.meas-spec.com/downloads/MS5611-01BA03.pdf |
Tomasz Duszynski | 9690d81a | 2015-06-23 20:45:48 +0200 | [diff] [blame] | 12 | * http://www.meas-spec.com/downloads/MS5607-02BA03.pdf |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 13 | * |
| 14 | */ |
| 15 | |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/iio/iio.h> |
| 18 | #include <linux/delay.h> |
Grégor Boirie | 3145229 | 2016-02-17 18:52:51 +0100 | [diff] [blame] | 19 | #include <linux/regulator/consumer.h> |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 20 | |
Daniel Baluta | 713bbb4 | 2016-02-03 18:50:38 +0200 | [diff] [blame] | 21 | #include <linux/iio/buffer.h> |
| 22 | #include <linux/iio/triggered_buffer.h> |
| 23 | #include <linux/iio/trigger_consumer.h> |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 24 | #include "ms5611.h" |
| 25 | |
| 26 | static bool ms5611_prom_is_valid(u16 *prom, size_t len) |
| 27 | { |
| 28 | int i, j; |
| 29 | uint16_t crc = 0, crc_orig = prom[7] & 0x000F; |
| 30 | |
| 31 | prom[7] &= 0xFF00; |
| 32 | |
| 33 | for (i = 0; i < len * 2; i++) { |
| 34 | if (i % 2 == 1) |
| 35 | crc ^= prom[i >> 1] & 0x00FF; |
| 36 | else |
| 37 | crc ^= prom[i >> 1] >> 8; |
| 38 | |
| 39 | for (j = 0; j < 8; j++) { |
| 40 | if (crc & 0x8000) |
| 41 | crc = (crc << 1) ^ 0x3000; |
| 42 | else |
| 43 | crc <<= 1; |
| 44 | } |
| 45 | } |
| 46 | |
| 47 | crc = (crc >> 12) & 0x000F; |
| 48 | |
| 49 | return crc_orig != 0x0000 && crc == crc_orig; |
| 50 | } |
| 51 | |
| 52 | static int ms5611_read_prom(struct iio_dev *indio_dev) |
| 53 | { |
| 54 | int ret, i; |
| 55 | struct ms5611_state *st = iio_priv(indio_dev); |
| 56 | |
| 57 | for (i = 0; i < MS5611_PROM_WORDS_NB; i++) { |
Tomasz Duszynski | 9690d81a | 2015-06-23 20:45:48 +0200 | [diff] [blame] | 58 | ret = st->read_prom_word(&indio_dev->dev, |
| 59 | i, &st->chip_info->prom[i]); |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 60 | if (ret < 0) { |
| 61 | dev_err(&indio_dev->dev, |
| 62 | "failed to read prom at %d\n", i); |
| 63 | return ret; |
| 64 | } |
| 65 | } |
| 66 | |
Tomasz Duszynski | 9690d81a | 2015-06-23 20:45:48 +0200 | [diff] [blame] | 67 | if (!ms5611_prom_is_valid(st->chip_info->prom, MS5611_PROM_WORDS_NB)) { |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 68 | dev_err(&indio_dev->dev, "PROM integrity check failed\n"); |
| 69 | return -ENODEV; |
| 70 | } |
| 71 | |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | static int ms5611_read_temp_and_pressure(struct iio_dev *indio_dev, |
| 76 | s32 *temp, s32 *pressure) |
| 77 | { |
| 78 | int ret; |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 79 | struct ms5611_state *st = iio_priv(indio_dev); |
| 80 | |
Tomasz Duszynski | 9690d81a | 2015-06-23 20:45:48 +0200 | [diff] [blame] | 81 | ret = st->read_adc_temp_and_pressure(&indio_dev->dev, temp, pressure); |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 82 | if (ret < 0) { |
| 83 | dev_err(&indio_dev->dev, |
| 84 | "failed to read temperature and pressure\n"); |
| 85 | return ret; |
| 86 | } |
| 87 | |
Tomasz Duszynski | 9690d81a | 2015-06-23 20:45:48 +0200 | [diff] [blame] | 88 | return st->chip_info->temp_and_pressure_compensate(st->chip_info, |
| 89 | temp, pressure); |
| 90 | } |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 91 | |
Tomasz Duszynski | 9690d81a | 2015-06-23 20:45:48 +0200 | [diff] [blame] | 92 | static int ms5611_temp_and_pressure_compensate(struct ms5611_chip_info *chip_info, |
| 93 | s32 *temp, s32 *pressure) |
| 94 | { |
| 95 | s32 t = *temp, p = *pressure; |
| 96 | s64 off, sens, dt; |
| 97 | |
| 98 | dt = t - (chip_info->prom[5] << 8); |
| 99 | off = ((s64)chip_info->prom[2] << 16) + ((chip_info->prom[4] * dt) >> 7); |
| 100 | sens = ((s64)chip_info->prom[1] << 15) + ((chip_info->prom[3] * dt) >> 8); |
| 101 | |
| 102 | t = 2000 + ((chip_info->prom[6] * dt) >> 23); |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 103 | if (t < 2000) { |
| 104 | s64 off2, sens2, t2; |
| 105 | |
| 106 | t2 = (dt * dt) >> 31; |
| 107 | off2 = (5 * (t - 2000) * (t - 2000)) >> 1; |
| 108 | sens2 = off2 >> 1; |
| 109 | |
| 110 | if (t < -1500) { |
| 111 | s64 tmp = (t + 1500) * (t + 1500); |
| 112 | |
| 113 | off2 += 7 * tmp; |
| 114 | sens2 += (11 * tmp) >> 1; |
| 115 | } |
| 116 | |
| 117 | t -= t2; |
| 118 | off -= off2; |
| 119 | sens -= sens2; |
| 120 | } |
| 121 | |
| 122 | *temp = t; |
| 123 | *pressure = (((p * sens) >> 21) - off) >> 15; |
| 124 | |
| 125 | return 0; |
| 126 | } |
| 127 | |
Tomasz Duszynski | 9690d81a | 2015-06-23 20:45:48 +0200 | [diff] [blame] | 128 | static int ms5607_temp_and_pressure_compensate(struct ms5611_chip_info *chip_info, |
| 129 | s32 *temp, s32 *pressure) |
| 130 | { |
| 131 | s32 t = *temp, p = *pressure; |
| 132 | s64 off, sens, dt; |
| 133 | |
| 134 | dt = t - (chip_info->prom[5] << 8); |
| 135 | off = ((s64)chip_info->prom[2] << 17) + ((chip_info->prom[4] * dt) >> 6); |
| 136 | sens = ((s64)chip_info->prom[1] << 16) + ((chip_info->prom[3] * dt) >> 7); |
| 137 | |
| 138 | t = 2000 + ((chip_info->prom[6] * dt) >> 23); |
| 139 | if (t < 2000) { |
Gregor Boirie | ce5b8fc | 2016-02-17 18:52:49 +0100 | [diff] [blame] | 140 | s64 off2, sens2, t2, tmp; |
Tomasz Duszynski | 9690d81a | 2015-06-23 20:45:48 +0200 | [diff] [blame] | 141 | |
| 142 | t2 = (dt * dt) >> 31; |
Gregor Boirie | ce5b8fc | 2016-02-17 18:52:49 +0100 | [diff] [blame] | 143 | tmp = (t - 2000) * (t - 2000); |
| 144 | off2 = (61 * tmp) >> 4; |
| 145 | sens2 = tmp << 1; |
Tomasz Duszynski | 9690d81a | 2015-06-23 20:45:48 +0200 | [diff] [blame] | 146 | |
| 147 | if (t < -1500) { |
Gregor Boirie | ce5b8fc | 2016-02-17 18:52:49 +0100 | [diff] [blame] | 148 | tmp = (t + 1500) * (t + 1500); |
Tomasz Duszynski | 9690d81a | 2015-06-23 20:45:48 +0200 | [diff] [blame] | 149 | off2 += 15 * tmp; |
Gregor Boirie | ce5b8fc | 2016-02-17 18:52:49 +0100 | [diff] [blame] | 150 | sens2 += 8 * tmp; |
Tomasz Duszynski | 9690d81a | 2015-06-23 20:45:48 +0200 | [diff] [blame] | 151 | } |
| 152 | |
| 153 | t -= t2; |
| 154 | off -= off2; |
| 155 | sens -= sens2; |
| 156 | } |
| 157 | |
| 158 | *temp = t; |
| 159 | *pressure = (((p * sens) >> 21) - off) >> 15; |
| 160 | |
| 161 | return 0; |
| 162 | } |
| 163 | |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 164 | static int ms5611_reset(struct iio_dev *indio_dev) |
| 165 | { |
| 166 | int ret; |
| 167 | struct ms5611_state *st = iio_priv(indio_dev); |
| 168 | |
| 169 | ret = st->reset(&indio_dev->dev); |
| 170 | if (ret < 0) { |
| 171 | dev_err(&indio_dev->dev, "failed to reset device\n"); |
| 172 | return ret; |
| 173 | } |
| 174 | |
| 175 | usleep_range(3000, 4000); |
| 176 | |
| 177 | return 0; |
| 178 | } |
| 179 | |
Daniel Baluta | 713bbb4 | 2016-02-03 18:50:38 +0200 | [diff] [blame] | 180 | static irqreturn_t ms5611_trigger_handler(int irq, void *p) |
| 181 | { |
| 182 | struct iio_poll_func *pf = p; |
| 183 | struct iio_dev *indio_dev = pf->indio_dev; |
| 184 | struct ms5611_state *st = iio_priv(indio_dev); |
| 185 | s32 buf[4]; /* s32 (pressure) + s32 (temp) + 2 * s32 (timestamp) */ |
| 186 | int ret; |
| 187 | |
| 188 | mutex_lock(&st->lock); |
| 189 | ret = ms5611_read_temp_and_pressure(indio_dev, &buf[1], &buf[0]); |
| 190 | mutex_unlock(&st->lock); |
| 191 | if (ret < 0) |
| 192 | goto err; |
| 193 | |
| 194 | iio_push_to_buffers_with_timestamp(indio_dev, buf, iio_get_time_ns()); |
| 195 | |
| 196 | err: |
| 197 | iio_trigger_notify_done(indio_dev->trig); |
| 198 | |
| 199 | return IRQ_HANDLED; |
| 200 | } |
| 201 | |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 202 | static int ms5611_read_raw(struct iio_dev *indio_dev, |
| 203 | struct iio_chan_spec const *chan, |
| 204 | int *val, int *val2, long mask) |
| 205 | { |
| 206 | int ret; |
| 207 | s32 temp, pressure; |
| 208 | struct ms5611_state *st = iio_priv(indio_dev); |
| 209 | |
| 210 | switch (mask) { |
| 211 | case IIO_CHAN_INFO_PROCESSED: |
| 212 | mutex_lock(&st->lock); |
| 213 | ret = ms5611_read_temp_and_pressure(indio_dev, |
| 214 | &temp, &pressure); |
| 215 | mutex_unlock(&st->lock); |
| 216 | if (ret < 0) |
| 217 | return ret; |
| 218 | |
| 219 | switch (chan->type) { |
| 220 | case IIO_TEMP: |
| 221 | *val = temp * 10; |
| 222 | return IIO_VAL_INT; |
| 223 | case IIO_PRESSURE: |
| 224 | *val = pressure / 1000; |
| 225 | *val2 = (pressure % 1000) * 1000; |
| 226 | return IIO_VAL_INT_PLUS_MICRO; |
| 227 | default: |
| 228 | return -EINVAL; |
| 229 | } |
Daniel Baluta | 1ad1ce9 | 2016-02-03 18:50:37 +0200 | [diff] [blame] | 230 | case IIO_CHAN_INFO_SCALE: |
| 231 | switch (chan->type) { |
| 232 | case IIO_TEMP: |
| 233 | *val = 10; |
| 234 | return IIO_VAL_INT; |
| 235 | case IIO_PRESSURE: |
| 236 | *val = 0; |
| 237 | *val2 = 1000; |
| 238 | return IIO_VAL_INT_PLUS_MICRO; |
| 239 | default: |
| 240 | return -EINVAL; |
| 241 | } |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 242 | } |
| 243 | |
| 244 | return -EINVAL; |
| 245 | } |
| 246 | |
Daniel Baluta | 713bbb4 | 2016-02-03 18:50:38 +0200 | [diff] [blame] | 247 | static const unsigned long ms5611_scan_masks[] = {0x3, 0}; |
| 248 | |
Tomasz Duszynski | 9690d81a | 2015-06-23 20:45:48 +0200 | [diff] [blame] | 249 | static struct ms5611_chip_info chip_info_tbl[] = { |
| 250 | [MS5611] = { |
| 251 | .temp_and_pressure_compensate = ms5611_temp_and_pressure_compensate, |
| 252 | }, |
| 253 | [MS5607] = { |
| 254 | .temp_and_pressure_compensate = ms5607_temp_and_pressure_compensate, |
| 255 | } |
| 256 | }; |
| 257 | |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 258 | static const struct iio_chan_spec ms5611_channels[] = { |
| 259 | { |
| 260 | .type = IIO_PRESSURE, |
Daniel Baluta | 1ad1ce9 | 2016-02-03 18:50:37 +0200 | [diff] [blame] | 261 | .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | |
| 262 | BIT(IIO_CHAN_INFO_SCALE), |
Daniel Baluta | 713bbb4 | 2016-02-03 18:50:38 +0200 | [diff] [blame] | 263 | .scan_index = 0, |
| 264 | .scan_type = { |
| 265 | .sign = 's', |
| 266 | .realbits = 32, |
| 267 | .storagebits = 32, |
| 268 | .endianness = IIO_CPU, |
| 269 | }, |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 270 | }, |
| 271 | { |
| 272 | .type = IIO_TEMP, |
Daniel Baluta | 1ad1ce9 | 2016-02-03 18:50:37 +0200 | [diff] [blame] | 273 | .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | |
| 274 | BIT(IIO_CHAN_INFO_SCALE), |
Daniel Baluta | 713bbb4 | 2016-02-03 18:50:38 +0200 | [diff] [blame] | 275 | .scan_index = 1, |
| 276 | .scan_type = { |
| 277 | .sign = 's', |
| 278 | .realbits = 32, |
| 279 | .storagebits = 32, |
| 280 | .endianness = IIO_CPU, |
| 281 | }, |
| 282 | }, |
| 283 | IIO_CHAN_SOFT_TIMESTAMP(2), |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 284 | }; |
| 285 | |
| 286 | static const struct iio_info ms5611_info = { |
| 287 | .read_raw = &ms5611_read_raw, |
| 288 | .driver_module = THIS_MODULE, |
| 289 | }; |
| 290 | |
| 291 | static int ms5611_init(struct iio_dev *indio_dev) |
| 292 | { |
| 293 | int ret; |
Grégor Boirie | 3145229 | 2016-02-17 18:52:51 +0100 | [diff] [blame] | 294 | struct regulator *vdd = devm_regulator_get(indio_dev->dev.parent, |
| 295 | "vdd"); |
| 296 | |
| 297 | /* Enable attached regulator if any. */ |
| 298 | if (!IS_ERR(vdd)) { |
| 299 | ret = regulator_enable(vdd); |
| 300 | if (ret) { |
| 301 | dev_err(indio_dev->dev.parent, |
| 302 | "failed to enable Vdd supply: %d\n", ret); |
| 303 | return ret; |
| 304 | } |
| 305 | } |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 306 | |
| 307 | ret = ms5611_reset(indio_dev); |
| 308 | if (ret < 0) |
| 309 | return ret; |
| 310 | |
| 311 | return ms5611_read_prom(indio_dev); |
| 312 | } |
| 313 | |
Grégor Boirie | eac635e | 2016-02-17 18:52:50 +0100 | [diff] [blame] | 314 | int ms5611_probe(struct iio_dev *indio_dev, struct device *dev, |
| 315 | const char *name, int type) |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 316 | { |
| 317 | int ret; |
| 318 | struct ms5611_state *st = iio_priv(indio_dev); |
| 319 | |
| 320 | mutex_init(&st->lock); |
Tomasz Duszynski | 9690d81a | 2015-06-23 20:45:48 +0200 | [diff] [blame] | 321 | st->chip_info = &chip_info_tbl[type]; |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 322 | indio_dev->dev.parent = dev; |
Grégor Boirie | eac635e | 2016-02-17 18:52:50 +0100 | [diff] [blame] | 323 | indio_dev->name = name; |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 324 | indio_dev->info = &ms5611_info; |
| 325 | indio_dev->channels = ms5611_channels; |
| 326 | indio_dev->num_channels = ARRAY_SIZE(ms5611_channels); |
| 327 | indio_dev->modes = INDIO_DIRECT_MODE; |
Daniel Baluta | 713bbb4 | 2016-02-03 18:50:38 +0200 | [diff] [blame] | 328 | indio_dev->available_scan_masks = ms5611_scan_masks; |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 329 | |
| 330 | ret = ms5611_init(indio_dev); |
| 331 | if (ret < 0) |
| 332 | return ret; |
| 333 | |
Daniel Baluta | 713bbb4 | 2016-02-03 18:50:38 +0200 | [diff] [blame] | 334 | ret = iio_triggered_buffer_setup(indio_dev, NULL, |
| 335 | ms5611_trigger_handler, NULL); |
| 336 | if (ret < 0) { |
| 337 | dev_err(dev, "iio triggered buffer setup failed\n"); |
| 338 | return ret; |
| 339 | } |
| 340 | |
| 341 | ret = iio_device_register(indio_dev); |
| 342 | if (ret < 0) { |
| 343 | dev_err(dev, "unable to register iio device\n"); |
| 344 | goto err_buffer_cleanup; |
| 345 | } |
| 346 | |
| 347 | return 0; |
| 348 | |
| 349 | err_buffer_cleanup: |
| 350 | iio_triggered_buffer_cleanup(indio_dev); |
| 351 | |
| 352 | return ret; |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 353 | } |
| 354 | EXPORT_SYMBOL(ms5611_probe); |
| 355 | |
Daniel Baluta | 713bbb4 | 2016-02-03 18:50:38 +0200 | [diff] [blame] | 356 | int ms5611_remove(struct iio_dev *indio_dev) |
| 357 | { |
| 358 | iio_device_unregister(indio_dev); |
| 359 | iio_triggered_buffer_cleanup(indio_dev); |
| 360 | |
| 361 | return 0; |
| 362 | } |
| 363 | EXPORT_SYMBOL(ms5611_remove); |
| 364 | |
Tomasz Duszynski | c0644160a | 2015-03-14 21:29:31 +0100 | [diff] [blame] | 365 | MODULE_AUTHOR("Tomasz Duszynski <tduszyns@gmail.com>"); |
| 366 | MODULE_DESCRIPTION("MS5611 core driver"); |
| 367 | MODULE_LICENSE("GPL v2"); |