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