1 /* 2 * STMicroelectronics pressures driver 3 * 4 * Copyright 2013 STMicroelectronics Inc. 5 * 6 * Denis Ciocca <denis.ciocca@st.com> 7 * 8 * Licensed under the GPL-2. 9 */ 10 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/slab.h> 14 #include <linux/errno.h> 15 #include <linux/types.h> 16 #include <linux/mutex.h> 17 #include <linux/interrupt.h> 18 #include <linux/i2c.h> 19 #include <linux/gpio.h> 20 #include <linux/irq.h> 21 #include <linux/delay.h> 22 #include <linux/iio/iio.h> 23 #include <linux/iio/sysfs.h> 24 #include <linux/iio/trigger.h> 25 #include <linux/iio/buffer.h> 26 #include <asm/unaligned.h> 27 28 #include <linux/iio/common/st_sensors.h> 29 #include "st_pressure.h" 30 31 #define ST_PRESS_LSB_PER_MBAR 4096UL 32 #define ST_PRESS_KPASCAL_NANO_SCALE (100000000UL / \ 33 ST_PRESS_LSB_PER_MBAR) 34 #define ST_PRESS_LSB_PER_CELSIUS 480UL 35 #define ST_PRESS_CELSIUS_NANO_SCALE (1000000000UL / \ 36 ST_PRESS_LSB_PER_CELSIUS) 37 #define ST_PRESS_NUMBER_DATA_CHANNELS 1 38 39 /* FULLSCALE */ 40 #define ST_PRESS_FS_AVL_1260MB 1260 41 42 #define ST_PRESS_1_OUT_XL_ADDR 0x28 43 #define ST_TEMP_1_OUT_L_ADDR 0x2b 44 45 /* CUSTOM VALUES FOR LPS331AP SENSOR */ 46 #define ST_PRESS_LPS331AP_WAI_EXP 0xbb 47 #define ST_PRESS_LPS331AP_ODR_ADDR 0x20 48 #define ST_PRESS_LPS331AP_ODR_MASK 0x70 49 #define ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL 0x01 50 #define ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL 0x05 51 #define ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL 0x06 52 #define ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL 0x07 53 #define ST_PRESS_LPS331AP_PW_ADDR 0x20 54 #define ST_PRESS_LPS331AP_PW_MASK 0x80 55 #define ST_PRESS_LPS331AP_FS_ADDR 0x23 56 #define ST_PRESS_LPS331AP_FS_MASK 0x30 57 #define ST_PRESS_LPS331AP_FS_AVL_1260_VAL 0x00 58 #define ST_PRESS_LPS331AP_FS_AVL_1260_GAIN ST_PRESS_KPASCAL_NANO_SCALE 59 #define ST_PRESS_LPS331AP_FS_AVL_TEMP_GAIN ST_PRESS_CELSIUS_NANO_SCALE 60 #define ST_PRESS_LPS331AP_BDU_ADDR 0x20 61 #define ST_PRESS_LPS331AP_BDU_MASK 0x04 62 #define ST_PRESS_LPS331AP_DRDY_IRQ_ADDR 0x22 63 #define ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK 0x04 64 #define ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK 0x20 65 #define ST_PRESS_LPS331AP_IHL_IRQ_ADDR 0x22 66 #define ST_PRESS_LPS331AP_IHL_IRQ_MASK 0x80 67 #define ST_PRESS_LPS331AP_MULTIREAD_BIT true 68 #define ST_PRESS_LPS331AP_TEMP_OFFSET 42500 69 70 /* CUSTOM VALUES FOR LPS001WP SENSOR */ 71 #define ST_PRESS_LPS001WP_WAI_EXP 0xba 72 #define ST_PRESS_LPS001WP_ODR_ADDR 0x20 73 #define ST_PRESS_LPS001WP_ODR_MASK 0x30 74 #define ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL 0x01 75 #define ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL 0x02 76 #define ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL 0x03 77 #define ST_PRESS_LPS001WP_PW_ADDR 0x20 78 #define ST_PRESS_LPS001WP_PW_MASK 0x40 79 #define ST_PRESS_LPS001WP_BDU_ADDR 0x20 80 #define ST_PRESS_LPS001WP_BDU_MASK 0x04 81 #define ST_PRESS_LPS001WP_MULTIREAD_BIT true 82 #define ST_PRESS_LPS001WP_OUT_L_ADDR 0x28 83 #define ST_TEMP_LPS001WP_OUT_L_ADDR 0x2a 84 85 /* CUSTOM VALUES FOR LPS25H SENSOR */ 86 #define ST_PRESS_LPS25H_WAI_EXP 0xbd 87 #define ST_PRESS_LPS25H_ODR_ADDR 0x20 88 #define ST_PRESS_LPS25H_ODR_MASK 0x70 89 #define ST_PRESS_LPS25H_ODR_AVL_1HZ_VAL 0x01 90 #define ST_PRESS_LPS25H_ODR_AVL_7HZ_VAL 0x02 91 #define ST_PRESS_LPS25H_ODR_AVL_13HZ_VAL 0x03 92 #define ST_PRESS_LPS25H_ODR_AVL_25HZ_VAL 0x04 93 #define ST_PRESS_LPS25H_PW_ADDR 0x20 94 #define ST_PRESS_LPS25H_PW_MASK 0x80 95 #define ST_PRESS_LPS25H_FS_ADDR 0x00 96 #define ST_PRESS_LPS25H_FS_MASK 0x00 97 #define ST_PRESS_LPS25H_FS_AVL_1260_VAL 0x00 98 #define ST_PRESS_LPS25H_FS_AVL_1260_GAIN ST_PRESS_KPASCAL_NANO_SCALE 99 #define ST_PRESS_LPS25H_FS_AVL_TEMP_GAIN ST_PRESS_CELSIUS_NANO_SCALE 100 #define ST_PRESS_LPS25H_BDU_ADDR 0x20 101 #define ST_PRESS_LPS25H_BDU_MASK 0x04 102 #define ST_PRESS_LPS25H_DRDY_IRQ_ADDR 0x23 103 #define ST_PRESS_LPS25H_DRDY_IRQ_INT1_MASK 0x01 104 #define ST_PRESS_LPS25H_DRDY_IRQ_INT2_MASK 0x10 105 #define ST_PRESS_LPS25H_IHL_IRQ_ADDR 0x22 106 #define ST_PRESS_LPS25H_IHL_IRQ_MASK 0x80 107 #define ST_PRESS_LPS25H_MULTIREAD_BIT true 108 #define ST_PRESS_LPS25H_TEMP_OFFSET 42500 109 #define ST_PRESS_LPS25H_OUT_XL_ADDR 0x28 110 #define ST_TEMP_LPS25H_OUT_L_ADDR 0x2b 111 112 static const struct iio_chan_spec st_press_1_channels[] = { 113 { 114 .type = IIO_PRESSURE, 115 .channel2 = IIO_NO_MOD, 116 .address = ST_PRESS_1_OUT_XL_ADDR, 117 .scan_index = ST_SENSORS_SCAN_X, 118 .scan_type = { 119 .sign = 'u', 120 .realbits = 24, 121 .storagebits = 24, 122 .endianness = IIO_LE, 123 }, 124 .info_mask_separate = 125 BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE), 126 .modified = 0, 127 }, 128 { 129 .type = IIO_TEMP, 130 .channel2 = IIO_NO_MOD, 131 .address = ST_TEMP_1_OUT_L_ADDR, 132 .scan_index = -1, 133 .scan_type = { 134 .sign = 'u', 135 .realbits = 16, 136 .storagebits = 16, 137 .endianness = IIO_LE, 138 }, 139 .info_mask_separate = 140 BIT(IIO_CHAN_INFO_RAW) | 141 BIT(IIO_CHAN_INFO_SCALE) | 142 BIT(IIO_CHAN_INFO_OFFSET), 143 .modified = 0, 144 }, 145 IIO_CHAN_SOFT_TIMESTAMP(1) 146 }; 147 148 static const struct iio_chan_spec st_press_lps001wp_channels[] = { 149 { 150 .type = IIO_PRESSURE, 151 .channel2 = IIO_NO_MOD, 152 .address = ST_PRESS_LPS001WP_OUT_L_ADDR, 153 .scan_index = ST_SENSORS_SCAN_X, 154 .scan_type = { 155 .sign = 'u', 156 .realbits = 16, 157 .storagebits = 16, 158 .endianness = IIO_LE, 159 }, 160 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 161 .modified = 0, 162 }, 163 { 164 .type = IIO_TEMP, 165 .channel2 = IIO_NO_MOD, 166 .address = ST_TEMP_LPS001WP_OUT_L_ADDR, 167 .scan_index = -1, 168 .scan_type = { 169 .sign = 'u', 170 .realbits = 16, 171 .storagebits = 16, 172 .endianness = IIO_LE, 173 }, 174 .info_mask_separate = 175 BIT(IIO_CHAN_INFO_RAW) | 176 BIT(IIO_CHAN_INFO_OFFSET), 177 .modified = 0, 178 }, 179 IIO_CHAN_SOFT_TIMESTAMP(1) 180 }; 181 182 static const struct st_sensor_settings st_press_sensors_settings[] = { 183 { 184 .wai = ST_PRESS_LPS331AP_WAI_EXP, 185 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS, 186 .sensors_supported = { 187 [0] = LPS331AP_PRESS_DEV_NAME, 188 }, 189 .ch = (struct iio_chan_spec *)st_press_1_channels, 190 .num_ch = ARRAY_SIZE(st_press_1_channels), 191 .odr = { 192 .addr = ST_PRESS_LPS331AP_ODR_ADDR, 193 .mask = ST_PRESS_LPS331AP_ODR_MASK, 194 .odr_avl = { 195 { 1, ST_PRESS_LPS331AP_ODR_AVL_1HZ_VAL, }, 196 { 7, ST_PRESS_LPS331AP_ODR_AVL_7HZ_VAL, }, 197 { 13, ST_PRESS_LPS331AP_ODR_AVL_13HZ_VAL, }, 198 { 25, ST_PRESS_LPS331AP_ODR_AVL_25HZ_VAL, }, 199 }, 200 }, 201 .pw = { 202 .addr = ST_PRESS_LPS331AP_PW_ADDR, 203 .mask = ST_PRESS_LPS331AP_PW_MASK, 204 .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE, 205 .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE, 206 }, 207 .fs = { 208 .addr = ST_PRESS_LPS331AP_FS_ADDR, 209 .mask = ST_PRESS_LPS331AP_FS_MASK, 210 .fs_avl = { 211 [0] = { 212 .num = ST_PRESS_FS_AVL_1260MB, 213 .value = ST_PRESS_LPS331AP_FS_AVL_1260_VAL, 214 .gain = ST_PRESS_LPS331AP_FS_AVL_1260_GAIN, 215 .gain2 = ST_PRESS_LPS331AP_FS_AVL_TEMP_GAIN, 216 }, 217 }, 218 }, 219 .bdu = { 220 .addr = ST_PRESS_LPS331AP_BDU_ADDR, 221 .mask = ST_PRESS_LPS331AP_BDU_MASK, 222 }, 223 .drdy_irq = { 224 .addr = ST_PRESS_LPS331AP_DRDY_IRQ_ADDR, 225 .mask_int1 = ST_PRESS_LPS331AP_DRDY_IRQ_INT1_MASK, 226 .mask_int2 = ST_PRESS_LPS331AP_DRDY_IRQ_INT2_MASK, 227 .addr_ihl = ST_PRESS_LPS331AP_IHL_IRQ_ADDR, 228 .mask_ihl = ST_PRESS_LPS331AP_IHL_IRQ_MASK, 229 }, 230 .multi_read_bit = ST_PRESS_LPS331AP_MULTIREAD_BIT, 231 .bootime = 2, 232 }, 233 { 234 .wai = ST_PRESS_LPS001WP_WAI_EXP, 235 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS, 236 .sensors_supported = { 237 [0] = LPS001WP_PRESS_DEV_NAME, 238 }, 239 .ch = (struct iio_chan_spec *)st_press_lps001wp_channels, 240 .num_ch = ARRAY_SIZE(st_press_lps001wp_channels), 241 .odr = { 242 .addr = ST_PRESS_LPS001WP_ODR_ADDR, 243 .mask = ST_PRESS_LPS001WP_ODR_MASK, 244 .odr_avl = { 245 { 1, ST_PRESS_LPS001WP_ODR_AVL_1HZ_VAL, }, 246 { 7, ST_PRESS_LPS001WP_ODR_AVL_7HZ_VAL, }, 247 { 13, ST_PRESS_LPS001WP_ODR_AVL_13HZ_VAL, }, 248 }, 249 }, 250 .pw = { 251 .addr = ST_PRESS_LPS001WP_PW_ADDR, 252 .mask = ST_PRESS_LPS001WP_PW_MASK, 253 .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE, 254 .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE, 255 }, 256 .fs = { 257 .addr = 0, 258 }, 259 .bdu = { 260 .addr = ST_PRESS_LPS001WP_BDU_ADDR, 261 .mask = ST_PRESS_LPS001WP_BDU_MASK, 262 }, 263 .drdy_irq = { 264 .addr = 0, 265 }, 266 .multi_read_bit = ST_PRESS_LPS001WP_MULTIREAD_BIT, 267 .bootime = 2, 268 }, 269 { 270 .wai = ST_PRESS_LPS25H_WAI_EXP, 271 .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS, 272 .sensors_supported = { 273 [0] = LPS25H_PRESS_DEV_NAME, 274 }, 275 .ch = (struct iio_chan_spec *)st_press_1_channels, 276 .num_ch = ARRAY_SIZE(st_press_1_channels), 277 .odr = { 278 .addr = ST_PRESS_LPS25H_ODR_ADDR, 279 .mask = ST_PRESS_LPS25H_ODR_MASK, 280 .odr_avl = { 281 { 1, ST_PRESS_LPS25H_ODR_AVL_1HZ_VAL, }, 282 { 7, ST_PRESS_LPS25H_ODR_AVL_7HZ_VAL, }, 283 { 13, ST_PRESS_LPS25H_ODR_AVL_13HZ_VAL, }, 284 { 25, ST_PRESS_LPS25H_ODR_AVL_25HZ_VAL, }, 285 }, 286 }, 287 .pw = { 288 .addr = ST_PRESS_LPS25H_PW_ADDR, 289 .mask = ST_PRESS_LPS25H_PW_MASK, 290 .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE, 291 .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE, 292 }, 293 .fs = { 294 .addr = ST_PRESS_LPS25H_FS_ADDR, 295 .mask = ST_PRESS_LPS25H_FS_MASK, 296 .fs_avl = { 297 [0] = { 298 .num = ST_PRESS_FS_AVL_1260MB, 299 .value = ST_PRESS_LPS25H_FS_AVL_1260_VAL, 300 .gain = ST_PRESS_LPS25H_FS_AVL_1260_GAIN, 301 .gain2 = ST_PRESS_LPS25H_FS_AVL_TEMP_GAIN, 302 }, 303 }, 304 }, 305 .bdu = { 306 .addr = ST_PRESS_LPS25H_BDU_ADDR, 307 .mask = ST_PRESS_LPS25H_BDU_MASK, 308 }, 309 .drdy_irq = { 310 .addr = ST_PRESS_LPS25H_DRDY_IRQ_ADDR, 311 .mask_int1 = ST_PRESS_LPS25H_DRDY_IRQ_INT1_MASK, 312 .mask_int2 = ST_PRESS_LPS25H_DRDY_IRQ_INT2_MASK, 313 .addr_ihl = ST_PRESS_LPS25H_IHL_IRQ_ADDR, 314 .mask_ihl = ST_PRESS_LPS25H_IHL_IRQ_MASK, 315 }, 316 .multi_read_bit = ST_PRESS_LPS25H_MULTIREAD_BIT, 317 .bootime = 2, 318 }, 319 }; 320 321 static int st_press_write_raw(struct iio_dev *indio_dev, 322 struct iio_chan_spec const *ch, 323 int val, 324 int val2, 325 long mask) 326 { 327 int err; 328 329 switch (mask) { 330 case IIO_CHAN_INFO_SAMP_FREQ: 331 if (val2) 332 return -EINVAL; 333 mutex_lock(&indio_dev->mlock); 334 err = st_sensors_set_odr(indio_dev, val); 335 mutex_unlock(&indio_dev->mlock); 336 return err; 337 default: 338 return -EINVAL; 339 } 340 } 341 342 static int st_press_read_raw(struct iio_dev *indio_dev, 343 struct iio_chan_spec const *ch, int *val, 344 int *val2, long mask) 345 { 346 int err; 347 struct st_sensor_data *press_data = iio_priv(indio_dev); 348 349 switch (mask) { 350 case IIO_CHAN_INFO_RAW: 351 err = st_sensors_read_info_raw(indio_dev, ch, val); 352 if (err < 0) 353 goto read_error; 354 355 return IIO_VAL_INT; 356 case IIO_CHAN_INFO_SCALE: 357 *val = 0; 358 359 switch (ch->type) { 360 case IIO_PRESSURE: 361 *val2 = press_data->current_fullscale->gain; 362 break; 363 case IIO_TEMP: 364 *val2 = press_data->current_fullscale->gain2; 365 break; 366 default: 367 err = -EINVAL; 368 goto read_error; 369 } 370 371 return IIO_VAL_INT_PLUS_NANO; 372 case IIO_CHAN_INFO_OFFSET: 373 switch (ch->type) { 374 case IIO_TEMP: 375 *val = 425; 376 *val2 = 10; 377 break; 378 default: 379 err = -EINVAL; 380 goto read_error; 381 } 382 383 return IIO_VAL_FRACTIONAL; 384 case IIO_CHAN_INFO_SAMP_FREQ: 385 *val = press_data->odr; 386 return IIO_VAL_INT; 387 default: 388 return -EINVAL; 389 } 390 391 read_error: 392 return err; 393 } 394 395 static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL(); 396 397 static struct attribute *st_press_attributes[] = { 398 &iio_dev_attr_sampling_frequency_available.dev_attr.attr, 399 NULL, 400 }; 401 402 static const struct attribute_group st_press_attribute_group = { 403 .attrs = st_press_attributes, 404 }; 405 406 static const struct iio_info press_info = { 407 .driver_module = THIS_MODULE, 408 .attrs = &st_press_attribute_group, 409 .read_raw = &st_press_read_raw, 410 .write_raw = &st_press_write_raw, 411 .debugfs_reg_access = &st_sensors_debugfs_reg_access, 412 }; 413 414 #ifdef CONFIG_IIO_TRIGGER 415 static const struct iio_trigger_ops st_press_trigger_ops = { 416 .owner = THIS_MODULE, 417 .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE, 418 }; 419 #define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops) 420 #else 421 #define ST_PRESS_TRIGGER_OPS NULL 422 #endif 423 424 int st_press_common_probe(struct iio_dev *indio_dev) 425 { 426 struct st_sensor_data *press_data = iio_priv(indio_dev); 427 int irq = press_data->get_irq_data_ready(indio_dev); 428 int err; 429 430 indio_dev->modes = INDIO_DIRECT_MODE; 431 indio_dev->info = &press_info; 432 mutex_init(&press_data->tb.buf_lock); 433 434 st_sensors_power_enable(indio_dev); 435 436 err = st_sensors_check_device_support(indio_dev, 437 ARRAY_SIZE(st_press_sensors_settings), 438 st_press_sensors_settings); 439 if (err < 0) 440 return err; 441 442 press_data->num_data_channels = ST_PRESS_NUMBER_DATA_CHANNELS; 443 press_data->multiread_bit = press_data->sensor_settings->multi_read_bit; 444 indio_dev->channels = press_data->sensor_settings->ch; 445 indio_dev->num_channels = press_data->sensor_settings->num_ch; 446 447 if (press_data->sensor_settings->fs.addr != 0) 448 press_data->current_fullscale = 449 (struct st_sensor_fullscale_avl *) 450 &press_data->sensor_settings->fs.fs_avl[0]; 451 452 press_data->odr = press_data->sensor_settings->odr.odr_avl[0].hz; 453 454 /* Some devices don't support a data ready pin. */ 455 if (!press_data->dev->platform_data && 456 press_data->sensor_settings->drdy_irq.addr) 457 press_data->dev->platform_data = 458 (struct st_sensors_platform_data *)&default_press_pdata; 459 460 err = st_sensors_init_sensor(indio_dev, press_data->dev->platform_data); 461 if (err < 0) 462 return err; 463 464 err = st_press_allocate_ring(indio_dev); 465 if (err < 0) 466 return err; 467 468 if (irq > 0) { 469 err = st_sensors_allocate_trigger(indio_dev, 470 ST_PRESS_TRIGGER_OPS); 471 if (err < 0) 472 goto st_press_probe_trigger_error; 473 } 474 475 err = iio_device_register(indio_dev); 476 if (err) 477 goto st_press_device_register_error; 478 479 dev_info(&indio_dev->dev, "registered pressure sensor %s\n", 480 indio_dev->name); 481 482 return err; 483 484 st_press_device_register_error: 485 if (irq > 0) 486 st_sensors_deallocate_trigger(indio_dev); 487 st_press_probe_trigger_error: 488 st_press_deallocate_ring(indio_dev); 489 490 return err; 491 } 492 EXPORT_SYMBOL(st_press_common_probe); 493 494 void st_press_common_remove(struct iio_dev *indio_dev) 495 { 496 struct st_sensor_data *press_data = iio_priv(indio_dev); 497 498 st_sensors_power_disable(indio_dev); 499 500 iio_device_unregister(indio_dev); 501 if (press_data->get_irq_data_ready(indio_dev) > 0) 502 st_sensors_deallocate_trigger(indio_dev); 503 504 st_press_deallocate_ring(indio_dev); 505 } 506 EXPORT_SYMBOL(st_press_common_remove); 507 508 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); 509 MODULE_DESCRIPTION("STMicroelectronics pressures driver"); 510 MODULE_LICENSE("GPL v2"); 511