1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * 3-axis accelerometer driver supporting many Bosch-Sensortec chips 4 * Copyright (c) 2014, Intel Corporation. 5 */ 6 7 #include <linux/module.h> 8 #include <linux/i2c.h> 9 #include <linux/interrupt.h> 10 #include <linux/delay.h> 11 #include <linux/slab.h> 12 #include <linux/acpi.h> 13 #include <linux/pm.h> 14 #include <linux/pm_runtime.h> 15 #include <linux/property.h> 16 #include <linux/iio/iio.h> 17 #include <linux/iio/sysfs.h> 18 #include <linux/iio/buffer.h> 19 #include <linux/iio/events.h> 20 #include <linux/iio/trigger.h> 21 #include <linux/iio/trigger_consumer.h> 22 #include <linux/iio/triggered_buffer.h> 23 #include <linux/regmap.h> 24 #include <linux/regulator/consumer.h> 25 26 #include "bmc150-accel.h" 27 28 #define BMC150_ACCEL_REG_CHIP_ID 0x00 29 30 #define BMC150_ACCEL_REG_INT_STATUS_2 0x0B 31 #define BMC150_ACCEL_ANY_MOTION_MASK 0x07 32 #define BMC150_ACCEL_ANY_MOTION_BIT_X BIT(0) 33 #define BMC150_ACCEL_ANY_MOTION_BIT_Y BIT(1) 34 #define BMC150_ACCEL_ANY_MOTION_BIT_Z BIT(2) 35 #define BMC150_ACCEL_ANY_MOTION_BIT_SIGN BIT(3) 36 37 #define BMC150_ACCEL_REG_PMU_LPW 0x11 38 #define BMC150_ACCEL_PMU_MODE_MASK 0xE0 39 #define BMC150_ACCEL_PMU_MODE_SHIFT 5 40 #define BMC150_ACCEL_PMU_BIT_SLEEP_DUR_MASK 0x17 41 #define BMC150_ACCEL_PMU_BIT_SLEEP_DUR_SHIFT 1 42 43 #define BMC150_ACCEL_REG_PMU_RANGE 0x0F 44 45 #define BMC150_ACCEL_DEF_RANGE_2G 0x03 46 #define BMC150_ACCEL_DEF_RANGE_4G 0x05 47 #define BMC150_ACCEL_DEF_RANGE_8G 0x08 48 #define BMC150_ACCEL_DEF_RANGE_16G 0x0C 49 50 /* Default BW: 125Hz */ 51 #define BMC150_ACCEL_REG_PMU_BW 0x10 52 #define BMC150_ACCEL_DEF_BW 125 53 54 #define BMC150_ACCEL_REG_RESET 0x14 55 #define BMC150_ACCEL_RESET_VAL 0xB6 56 57 #define BMC150_ACCEL_REG_INT_MAP_0 0x19 58 #define BMC150_ACCEL_INT_MAP_0_BIT_INT1_SLOPE BIT(2) 59 60 #define BMC150_ACCEL_REG_INT_MAP_1 0x1A 61 #define BMC150_ACCEL_INT_MAP_1_BIT_INT1_DATA BIT(0) 62 #define BMC150_ACCEL_INT_MAP_1_BIT_INT1_FWM BIT(1) 63 #define BMC150_ACCEL_INT_MAP_1_BIT_INT1_FFULL BIT(2) 64 #define BMC150_ACCEL_INT_MAP_1_BIT_INT2_FFULL BIT(5) 65 #define BMC150_ACCEL_INT_MAP_1_BIT_INT2_FWM BIT(6) 66 #define BMC150_ACCEL_INT_MAP_1_BIT_INT2_DATA BIT(7) 67 68 #define BMC150_ACCEL_REG_INT_MAP_2 0x1B 69 #define BMC150_ACCEL_INT_MAP_2_BIT_INT2_SLOPE BIT(2) 70 71 #define BMC150_ACCEL_REG_INT_RST_LATCH 0x21 72 #define BMC150_ACCEL_INT_MODE_LATCH_RESET 0x80 73 #define BMC150_ACCEL_INT_MODE_LATCH_INT 0x0F 74 #define BMC150_ACCEL_INT_MODE_NON_LATCH_INT 0x00 75 76 #define BMC150_ACCEL_REG_INT_EN_0 0x16 77 #define BMC150_ACCEL_INT_EN_BIT_SLP_X BIT(0) 78 #define BMC150_ACCEL_INT_EN_BIT_SLP_Y BIT(1) 79 #define BMC150_ACCEL_INT_EN_BIT_SLP_Z BIT(2) 80 81 #define BMC150_ACCEL_REG_INT_EN_1 0x17 82 #define BMC150_ACCEL_INT_EN_BIT_DATA_EN BIT(4) 83 #define BMC150_ACCEL_INT_EN_BIT_FFULL_EN BIT(5) 84 #define BMC150_ACCEL_INT_EN_BIT_FWM_EN BIT(6) 85 86 #define BMC150_ACCEL_REG_INT_OUT_CTRL 0x20 87 #define BMC150_ACCEL_INT_OUT_CTRL_INT1_LVL BIT(0) 88 #define BMC150_ACCEL_INT_OUT_CTRL_INT2_LVL BIT(2) 89 90 #define BMC150_ACCEL_REG_INT_5 0x27 91 #define BMC150_ACCEL_SLOPE_DUR_MASK 0x03 92 93 #define BMC150_ACCEL_REG_INT_6 0x28 94 #define BMC150_ACCEL_SLOPE_THRES_MASK 0xFF 95 96 /* Slope duration in terms of number of samples */ 97 #define BMC150_ACCEL_DEF_SLOPE_DURATION 1 98 /* in terms of multiples of g's/LSB, based on range */ 99 #define BMC150_ACCEL_DEF_SLOPE_THRESHOLD 1 100 101 #define BMC150_ACCEL_REG_XOUT_L 0x02 102 103 #define BMC150_ACCEL_MAX_STARTUP_TIME_MS 100 104 105 /* Sleep Duration values */ 106 #define BMC150_ACCEL_SLEEP_500_MICRO 0x05 107 #define BMC150_ACCEL_SLEEP_1_MS 0x06 108 #define BMC150_ACCEL_SLEEP_2_MS 0x07 109 #define BMC150_ACCEL_SLEEP_4_MS 0x08 110 #define BMC150_ACCEL_SLEEP_6_MS 0x09 111 #define BMC150_ACCEL_SLEEP_10_MS 0x0A 112 #define BMC150_ACCEL_SLEEP_25_MS 0x0B 113 #define BMC150_ACCEL_SLEEP_50_MS 0x0C 114 #define BMC150_ACCEL_SLEEP_100_MS 0x0D 115 #define BMC150_ACCEL_SLEEP_500_MS 0x0E 116 #define BMC150_ACCEL_SLEEP_1_SEC 0x0F 117 118 #define BMC150_ACCEL_REG_TEMP 0x08 119 #define BMC150_ACCEL_TEMP_CENTER_VAL 23 120 121 #define BMC150_ACCEL_AXIS_TO_REG(axis) (BMC150_ACCEL_REG_XOUT_L + (axis * 2)) 122 #define BMC150_AUTO_SUSPEND_DELAY_MS 2000 123 124 #define BMC150_ACCEL_REG_FIFO_STATUS 0x0E 125 #define BMC150_ACCEL_REG_FIFO_CONFIG0 0x30 126 #define BMC150_ACCEL_REG_FIFO_CONFIG1 0x3E 127 #define BMC150_ACCEL_REG_FIFO_DATA 0x3F 128 #define BMC150_ACCEL_FIFO_LENGTH 32 129 130 enum bmc150_accel_axis { 131 AXIS_X, 132 AXIS_Y, 133 AXIS_Z, 134 AXIS_MAX, 135 }; 136 137 enum bmc150_power_modes { 138 BMC150_ACCEL_SLEEP_MODE_NORMAL, 139 BMC150_ACCEL_SLEEP_MODE_DEEP_SUSPEND, 140 BMC150_ACCEL_SLEEP_MODE_LPM, 141 BMC150_ACCEL_SLEEP_MODE_SUSPEND = 0x04, 142 }; 143 144 struct bmc150_scale_info { 145 int scale; 146 u8 reg_range; 147 }; 148 149 struct bmc150_accel_chip_info { 150 const char *name; 151 u8 chip_id; 152 const struct iio_chan_spec *channels; 153 int num_channels; 154 const struct bmc150_scale_info scale_table[4]; 155 }; 156 157 static const struct { 158 int val; 159 int val2; 160 u8 bw_bits; 161 } bmc150_accel_samp_freq_table[] = { {15, 620000, 0x08}, 162 {31, 260000, 0x09}, 163 {62, 500000, 0x0A}, 164 {125, 0, 0x0B}, 165 {250, 0, 0x0C}, 166 {500, 0, 0x0D}, 167 {1000, 0, 0x0E}, 168 {2000, 0, 0x0F} }; 169 170 static __maybe_unused const struct { 171 int bw_bits; 172 int msec; 173 } bmc150_accel_sample_upd_time[] = { {0x08, 64}, 174 {0x09, 32}, 175 {0x0A, 16}, 176 {0x0B, 8}, 177 {0x0C, 4}, 178 {0x0D, 2}, 179 {0x0E, 1}, 180 {0x0F, 1} }; 181 182 static const struct { 183 int sleep_dur; 184 u8 reg_value; 185 } bmc150_accel_sleep_value_table[] = { {0, 0}, 186 {500, BMC150_ACCEL_SLEEP_500_MICRO}, 187 {1000, BMC150_ACCEL_SLEEP_1_MS}, 188 {2000, BMC150_ACCEL_SLEEP_2_MS}, 189 {4000, BMC150_ACCEL_SLEEP_4_MS}, 190 {6000, BMC150_ACCEL_SLEEP_6_MS}, 191 {10000, BMC150_ACCEL_SLEEP_10_MS}, 192 {25000, BMC150_ACCEL_SLEEP_25_MS}, 193 {50000, BMC150_ACCEL_SLEEP_50_MS}, 194 {100000, BMC150_ACCEL_SLEEP_100_MS}, 195 {500000, BMC150_ACCEL_SLEEP_500_MS}, 196 {1000000, BMC150_ACCEL_SLEEP_1_SEC} }; 197 198 const struct regmap_config bmc150_regmap_conf = { 199 .reg_bits = 8, 200 .val_bits = 8, 201 .max_register = 0x3f, 202 }; 203 EXPORT_SYMBOL_NS_GPL(bmc150_regmap_conf, "IIO_BMC150"); 204 205 static int bmc150_accel_set_mode(struct bmc150_accel_data *data, 206 enum bmc150_power_modes mode, 207 int dur_us) 208 { 209 struct device *dev = regmap_get_device(data->regmap); 210 int i; 211 int ret; 212 u8 lpw_bits; 213 int dur_val = -1; 214 215 if (dur_us > 0) { 216 for (i = 0; i < ARRAY_SIZE(bmc150_accel_sleep_value_table); 217 ++i) { 218 if (bmc150_accel_sleep_value_table[i].sleep_dur == 219 dur_us) 220 dur_val = 221 bmc150_accel_sleep_value_table[i].reg_value; 222 } 223 } else { 224 dur_val = 0; 225 } 226 227 if (dur_val < 0) 228 return -EINVAL; 229 230 lpw_bits = mode << BMC150_ACCEL_PMU_MODE_SHIFT; 231 lpw_bits |= (dur_val << BMC150_ACCEL_PMU_BIT_SLEEP_DUR_SHIFT); 232 233 dev_dbg(dev, "Set Mode bits %x\n", lpw_bits); 234 235 ret = regmap_write(data->regmap, BMC150_ACCEL_REG_PMU_LPW, lpw_bits); 236 if (ret < 0) { 237 dev_err(dev, "Error writing reg_pmu_lpw\n"); 238 return ret; 239 } 240 241 return 0; 242 } 243 244 static int bmc150_accel_set_bw(struct bmc150_accel_data *data, int val, 245 int val2) 246 { 247 int i; 248 int ret; 249 250 for (i = 0; i < ARRAY_SIZE(bmc150_accel_samp_freq_table); ++i) { 251 if (bmc150_accel_samp_freq_table[i].val == val && 252 bmc150_accel_samp_freq_table[i].val2 == val2) { 253 ret = regmap_write(data->regmap, 254 BMC150_ACCEL_REG_PMU_BW, 255 bmc150_accel_samp_freq_table[i].bw_bits); 256 if (ret < 0) 257 return ret; 258 259 data->bw_bits = 260 bmc150_accel_samp_freq_table[i].bw_bits; 261 return 0; 262 } 263 } 264 265 return -EINVAL; 266 } 267 268 static int bmc150_accel_update_slope(struct bmc150_accel_data *data) 269 { 270 struct device *dev = regmap_get_device(data->regmap); 271 int ret; 272 273 ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_6, 274 data->slope_thres); 275 if (ret < 0) { 276 dev_err(dev, "Error writing reg_int_6\n"); 277 return ret; 278 } 279 280 ret = regmap_update_bits(data->regmap, BMC150_ACCEL_REG_INT_5, 281 BMC150_ACCEL_SLOPE_DUR_MASK, data->slope_dur); 282 if (ret < 0) { 283 dev_err(dev, "Error updating reg_int_5\n"); 284 return ret; 285 } 286 287 dev_dbg(dev, "%x %x\n", data->slope_thres, data->slope_dur); 288 289 return ret; 290 } 291 292 static int bmc150_accel_any_motion_setup(struct bmc150_accel_trigger *t, 293 bool state) 294 { 295 if (state) 296 return bmc150_accel_update_slope(t->data); 297 298 return 0; 299 } 300 301 static int bmc150_accel_get_bw(struct bmc150_accel_data *data, int *val, 302 int *val2) 303 { 304 int i; 305 306 for (i = 0; i < ARRAY_SIZE(bmc150_accel_samp_freq_table); ++i) { 307 if (bmc150_accel_samp_freq_table[i].bw_bits == data->bw_bits) { 308 *val = bmc150_accel_samp_freq_table[i].val; 309 *val2 = bmc150_accel_samp_freq_table[i].val2; 310 return IIO_VAL_INT_PLUS_MICRO; 311 } 312 } 313 314 return -EINVAL; 315 } 316 317 #ifdef CONFIG_PM 318 static int bmc150_accel_get_startup_times(struct bmc150_accel_data *data) 319 { 320 int i; 321 322 for (i = 0; i < ARRAY_SIZE(bmc150_accel_sample_upd_time); ++i) { 323 if (bmc150_accel_sample_upd_time[i].bw_bits == data->bw_bits) 324 return bmc150_accel_sample_upd_time[i].msec; 325 } 326 327 return BMC150_ACCEL_MAX_STARTUP_TIME_MS; 328 } 329 330 static int bmc150_accel_set_power_state(struct bmc150_accel_data *data, bool on) 331 { 332 struct device *dev = regmap_get_device(data->regmap); 333 int ret; 334 335 if (on) 336 ret = pm_runtime_resume_and_get(dev); 337 else 338 ret = pm_runtime_put_autosuspend(dev); 339 if (ret < 0) { 340 dev_err(dev, 341 "Failed: %s for %d\n", __func__, on); 342 return ret; 343 } 344 345 return 0; 346 } 347 #else 348 static int bmc150_accel_set_power_state(struct bmc150_accel_data *data, bool on) 349 { 350 return 0; 351 } 352 #endif 353 354 #ifdef CONFIG_ACPI 355 /* 356 * Support for getting accelerometer information from BOSC0200 ACPI nodes. 357 * 358 * There are 2 variants of the BOSC0200 ACPI node. Some 2-in-1s with 360 degree 359 * hinges declare 2 I2C ACPI-resources for 2 accelerometers, 1 in the display 360 * and 1 in the base of the 2-in-1. On these 2-in-1s the ROMS ACPI object 361 * contains the mount-matrix for the sensor in the display and ROMK contains 362 * the mount-matrix for the sensor in the base. On devices using a single 363 * sensor there is a ROTM ACPI object which contains the mount-matrix. 364 * 365 * Here is an incomplete list of devices known to use 1 of these setups: 366 * 367 * Yoga devices with 2 accelerometers using ROMS + ROMK for the mount-matrices: 368 * Lenovo Thinkpad Yoga 11e 3th gen 369 * Lenovo Thinkpad Yoga 11e 4th gen 370 * 371 * Tablets using a single accelerometer using ROTM for the mount-matrix: 372 * Chuwi Hi8 Pro (CWI513) 373 * Chuwi Vi8 Plus (CWI519) 374 * Chuwi Hi13 375 * Irbis TW90 376 * Jumper EZpad mini 3 377 * Onda V80 plus 378 * Predia Basic Tablet 379 */ 380 static bool bmc150_apply_bosc0200_acpi_orientation(struct device *dev, 381 struct iio_mount_matrix *orientation) 382 { 383 struct iio_dev *indio_dev = dev_get_drvdata(dev); 384 acpi_handle handle = ACPI_HANDLE(dev); 385 char *name, *alt_name, *label; 386 387 if (strcmp(dev_name(dev), "i2c-BOSC0200:base") == 0) { 388 alt_name = "ROMK"; 389 label = "accel-base"; 390 } else { 391 alt_name = "ROMS"; 392 label = "accel-display"; 393 } 394 395 if (acpi_has_method(handle, "ROTM")) { 396 name = "ROTM"; 397 } else if (acpi_has_method(handle, alt_name)) { 398 name = alt_name; 399 indio_dev->label = label; 400 } else { 401 return false; 402 } 403 404 return iio_read_acpi_mount_matrix(dev, orientation, name); 405 } 406 407 static bool bmc150_apply_dual250e_acpi_orientation(struct device *dev, 408 struct iio_mount_matrix *orientation) 409 { 410 struct iio_dev *indio_dev = dev_get_drvdata(dev); 411 412 if (strcmp(dev_name(dev), "i2c-DUAL250E:base") == 0) 413 indio_dev->label = "accel-base"; 414 else 415 indio_dev->label = "accel-display"; 416 417 return false; /* DUAL250E fwnodes have no mount matrix info */ 418 } 419 420 static bool bmc150_apply_acpi_orientation(struct device *dev, 421 struct iio_mount_matrix *orientation) 422 { 423 struct acpi_device *adev = ACPI_COMPANION(dev); 424 425 if (adev && acpi_dev_hid_uid_match(adev, "BOSC0200", NULL)) 426 return bmc150_apply_bosc0200_acpi_orientation(dev, orientation); 427 428 if (adev && acpi_dev_hid_uid_match(adev, "DUAL250E", NULL)) 429 return bmc150_apply_dual250e_acpi_orientation(dev, orientation); 430 431 return false; 432 } 433 #else 434 static bool bmc150_apply_acpi_orientation(struct device *dev, 435 struct iio_mount_matrix *orientation) 436 { 437 return false; 438 } 439 #endif 440 441 struct bmc150_accel_interrupt_info { 442 u8 map_reg; 443 u8 map_bitmask; 444 u8 en_reg; 445 u8 en_bitmask; 446 }; 447 448 static const struct bmc150_accel_interrupt_info 449 bmc150_accel_interrupts_int1[BMC150_ACCEL_INTERRUPTS] = { 450 { /* data ready interrupt */ 451 .map_reg = BMC150_ACCEL_REG_INT_MAP_1, 452 .map_bitmask = BMC150_ACCEL_INT_MAP_1_BIT_INT1_DATA, 453 .en_reg = BMC150_ACCEL_REG_INT_EN_1, 454 .en_bitmask = BMC150_ACCEL_INT_EN_BIT_DATA_EN, 455 }, 456 { /* motion interrupt */ 457 .map_reg = BMC150_ACCEL_REG_INT_MAP_0, 458 .map_bitmask = BMC150_ACCEL_INT_MAP_0_BIT_INT1_SLOPE, 459 .en_reg = BMC150_ACCEL_REG_INT_EN_0, 460 .en_bitmask = BMC150_ACCEL_INT_EN_BIT_SLP_X | 461 BMC150_ACCEL_INT_EN_BIT_SLP_Y | 462 BMC150_ACCEL_INT_EN_BIT_SLP_Z 463 }, 464 { /* fifo watermark interrupt */ 465 .map_reg = BMC150_ACCEL_REG_INT_MAP_1, 466 .map_bitmask = BMC150_ACCEL_INT_MAP_1_BIT_INT1_FWM, 467 .en_reg = BMC150_ACCEL_REG_INT_EN_1, 468 .en_bitmask = BMC150_ACCEL_INT_EN_BIT_FWM_EN, 469 }, 470 }; 471 472 static const struct bmc150_accel_interrupt_info 473 bmc150_accel_interrupts_int2[BMC150_ACCEL_INTERRUPTS] = { 474 { /* data ready interrupt */ 475 .map_reg = BMC150_ACCEL_REG_INT_MAP_1, 476 .map_bitmask = BMC150_ACCEL_INT_MAP_1_BIT_INT2_DATA, 477 .en_reg = BMC150_ACCEL_REG_INT_EN_1, 478 .en_bitmask = BMC150_ACCEL_INT_EN_BIT_DATA_EN, 479 }, 480 { /* motion interrupt */ 481 .map_reg = BMC150_ACCEL_REG_INT_MAP_2, 482 .map_bitmask = BMC150_ACCEL_INT_MAP_2_BIT_INT2_SLOPE, 483 .en_reg = BMC150_ACCEL_REG_INT_EN_0, 484 .en_bitmask = BMC150_ACCEL_INT_EN_BIT_SLP_X | 485 BMC150_ACCEL_INT_EN_BIT_SLP_Y | 486 BMC150_ACCEL_INT_EN_BIT_SLP_Z 487 }, 488 { /* fifo watermark interrupt */ 489 .map_reg = BMC150_ACCEL_REG_INT_MAP_1, 490 .map_bitmask = BMC150_ACCEL_INT_MAP_1_BIT_INT2_FWM, 491 .en_reg = BMC150_ACCEL_REG_INT_EN_1, 492 .en_bitmask = BMC150_ACCEL_INT_EN_BIT_FWM_EN, 493 }, 494 }; 495 496 static void bmc150_accel_interrupts_setup(struct iio_dev *indio_dev, 497 struct bmc150_accel_data *data, int irq) 498 { 499 const struct bmc150_accel_interrupt_info *irq_info = NULL; 500 struct device *dev = regmap_get_device(data->regmap); 501 int i; 502 503 /* 504 * For now we map all interrupts to the same output pin. 505 * However, some boards may have just INT2 (and not INT1) connected, 506 * so we try to detect which IRQ it is based on the interrupt-names. 507 * Without interrupt-names, we assume the irq belongs to INT1. 508 */ 509 irq_info = bmc150_accel_interrupts_int1; 510 if (data->type == BOSCH_BMC156 || 511 irq == fwnode_irq_get_byname(dev_fwnode(dev), "INT2")) 512 irq_info = bmc150_accel_interrupts_int2; 513 514 for (i = 0; i < BMC150_ACCEL_INTERRUPTS; i++) 515 data->interrupts[i].info = &irq_info[i]; 516 } 517 518 static int bmc150_accel_set_interrupt(struct bmc150_accel_data *data, int i, 519 bool state) 520 { 521 struct device *dev = regmap_get_device(data->regmap); 522 struct bmc150_accel_interrupt *intr = &data->interrupts[i]; 523 const struct bmc150_accel_interrupt_info *info = intr->info; 524 int ret; 525 526 /* We do not always have an IRQ */ 527 if (data->irq <= 0) 528 return 0; 529 530 if (state) { 531 if (atomic_inc_return(&intr->users) > 1) 532 return 0; 533 } else { 534 if (atomic_dec_return(&intr->users) > 0) 535 return 0; 536 } 537 538 /* 539 * We will expect the enable and disable to do operation in reverse 540 * order. This will happen here anyway, as our resume operation uses 541 * sync mode runtime pm calls. The suspend operation will be delayed 542 * by autosuspend delay. 543 * So the disable operation will still happen in reverse order of 544 * enable operation. When runtime pm is disabled the mode is always on, 545 * so sequence doesn't matter. 546 */ 547 ret = bmc150_accel_set_power_state(data, state); 548 if (ret < 0) 549 return ret; 550 551 /* map the interrupt to the appropriate pins */ 552 ret = regmap_update_bits(data->regmap, info->map_reg, info->map_bitmask, 553 (state ? info->map_bitmask : 0)); 554 if (ret < 0) { 555 dev_err(dev, "Error updating reg_int_map\n"); 556 goto out_fix_power_state; 557 } 558 559 /* enable/disable the interrupt */ 560 ret = regmap_update_bits(data->regmap, info->en_reg, info->en_bitmask, 561 (state ? info->en_bitmask : 0)); 562 if (ret < 0) { 563 dev_err(dev, "Error updating reg_int_en\n"); 564 goto out_fix_power_state; 565 } 566 567 return 0; 568 569 out_fix_power_state: 570 bmc150_accel_set_power_state(data, false); 571 return ret; 572 } 573 574 static int bmc150_accel_set_scale(struct bmc150_accel_data *data, int val) 575 { 576 struct device *dev = regmap_get_device(data->regmap); 577 int ret, i; 578 579 for (i = 0; i < ARRAY_SIZE(data->chip_info->scale_table); ++i) { 580 if (data->chip_info->scale_table[i].scale == val) { 581 ret = regmap_write(data->regmap, 582 BMC150_ACCEL_REG_PMU_RANGE, 583 data->chip_info->scale_table[i].reg_range); 584 if (ret < 0) { 585 dev_err(dev, "Error writing pmu_range\n"); 586 return ret; 587 } 588 589 data->range = data->chip_info->scale_table[i].reg_range; 590 return 0; 591 } 592 } 593 594 return -EINVAL; 595 } 596 597 static int bmc150_accel_get_temp(struct bmc150_accel_data *data, int *val) 598 { 599 struct device *dev = regmap_get_device(data->regmap); 600 int ret; 601 unsigned int value; 602 603 mutex_lock(&data->mutex); 604 605 ret = regmap_read(data->regmap, BMC150_ACCEL_REG_TEMP, &value); 606 if (ret < 0) { 607 dev_err(dev, "Error reading reg_temp\n"); 608 mutex_unlock(&data->mutex); 609 return ret; 610 } 611 *val = sign_extend32(value, 7); 612 613 mutex_unlock(&data->mutex); 614 615 return IIO_VAL_INT; 616 } 617 618 static int bmc150_accel_get_axis(struct bmc150_accel_data *data, 619 struct iio_chan_spec const *chan, 620 int *val) 621 { 622 struct device *dev = regmap_get_device(data->regmap); 623 int ret; 624 int axis = chan->scan_index; 625 __le16 raw_val; 626 627 mutex_lock(&data->mutex); 628 ret = bmc150_accel_set_power_state(data, true); 629 if (ret < 0) { 630 mutex_unlock(&data->mutex); 631 return ret; 632 } 633 634 ret = regmap_bulk_read(data->regmap, BMC150_ACCEL_AXIS_TO_REG(axis), 635 &raw_val, sizeof(raw_val)); 636 if (ret < 0) { 637 dev_err(dev, "Error reading axis %d\n", axis); 638 bmc150_accel_set_power_state(data, false); 639 mutex_unlock(&data->mutex); 640 return ret; 641 } 642 *val = sign_extend32(le16_to_cpu(raw_val) >> chan->scan_type.shift, 643 chan->scan_type.realbits - 1); 644 ret = bmc150_accel_set_power_state(data, false); 645 mutex_unlock(&data->mutex); 646 if (ret < 0) 647 return ret; 648 649 return IIO_VAL_INT; 650 } 651 652 static int bmc150_accel_read_raw(struct iio_dev *indio_dev, 653 struct iio_chan_spec const *chan, 654 int *val, int *val2, long mask) 655 { 656 struct bmc150_accel_data *data = iio_priv(indio_dev); 657 int ret; 658 659 switch (mask) { 660 case IIO_CHAN_INFO_RAW: 661 switch (chan->type) { 662 case IIO_TEMP: 663 return bmc150_accel_get_temp(data, val); 664 case IIO_ACCEL: 665 if (iio_buffer_enabled(indio_dev)) 666 return -EBUSY; 667 else 668 return bmc150_accel_get_axis(data, chan, val); 669 default: 670 return -EINVAL; 671 } 672 case IIO_CHAN_INFO_OFFSET: 673 if (chan->type == IIO_TEMP) { 674 *val = BMC150_ACCEL_TEMP_CENTER_VAL; 675 return IIO_VAL_INT; 676 } else { 677 return -EINVAL; 678 } 679 case IIO_CHAN_INFO_SCALE: 680 *val = 0; 681 switch (chan->type) { 682 case IIO_TEMP: 683 *val2 = 500000; 684 return IIO_VAL_INT_PLUS_MICRO; 685 case IIO_ACCEL: 686 { 687 int i; 688 const struct bmc150_scale_info *si; 689 int st_size = ARRAY_SIZE(data->chip_info->scale_table); 690 691 for (i = 0; i < st_size; ++i) { 692 si = &data->chip_info->scale_table[i]; 693 if (si->reg_range == data->range) { 694 *val2 = si->scale; 695 return IIO_VAL_INT_PLUS_MICRO; 696 } 697 } 698 return -EINVAL; 699 } 700 default: 701 return -EINVAL; 702 } 703 case IIO_CHAN_INFO_SAMP_FREQ: 704 mutex_lock(&data->mutex); 705 ret = bmc150_accel_get_bw(data, val, val2); 706 mutex_unlock(&data->mutex); 707 return ret; 708 default: 709 return -EINVAL; 710 } 711 } 712 713 static int bmc150_accel_write_raw(struct iio_dev *indio_dev, 714 struct iio_chan_spec const *chan, 715 int val, int val2, long mask) 716 { 717 struct bmc150_accel_data *data = iio_priv(indio_dev); 718 int ret; 719 720 switch (mask) { 721 case IIO_CHAN_INFO_SAMP_FREQ: 722 mutex_lock(&data->mutex); 723 ret = bmc150_accel_set_bw(data, val, val2); 724 mutex_unlock(&data->mutex); 725 break; 726 case IIO_CHAN_INFO_SCALE: 727 if (val) 728 return -EINVAL; 729 730 mutex_lock(&data->mutex); 731 ret = bmc150_accel_set_scale(data, val2); 732 mutex_unlock(&data->mutex); 733 return ret; 734 default: 735 ret = -EINVAL; 736 } 737 738 return ret; 739 } 740 741 static int bmc150_accel_read_event(struct iio_dev *indio_dev, 742 const struct iio_chan_spec *chan, 743 enum iio_event_type type, 744 enum iio_event_direction dir, 745 enum iio_event_info info, 746 int *val, int *val2) 747 { 748 struct bmc150_accel_data *data = iio_priv(indio_dev); 749 750 *val2 = 0; 751 switch (info) { 752 case IIO_EV_INFO_VALUE: 753 *val = data->slope_thres; 754 break; 755 case IIO_EV_INFO_PERIOD: 756 *val = data->slope_dur; 757 break; 758 default: 759 return -EINVAL; 760 } 761 762 return IIO_VAL_INT; 763 } 764 765 static int bmc150_accel_write_event(struct iio_dev *indio_dev, 766 const struct iio_chan_spec *chan, 767 enum iio_event_type type, 768 enum iio_event_direction dir, 769 enum iio_event_info info, 770 int val, int val2) 771 { 772 struct bmc150_accel_data *data = iio_priv(indio_dev); 773 774 if (data->ev_enable_state) 775 return -EBUSY; 776 777 switch (info) { 778 case IIO_EV_INFO_VALUE: 779 data->slope_thres = val & BMC150_ACCEL_SLOPE_THRES_MASK; 780 break; 781 case IIO_EV_INFO_PERIOD: 782 data->slope_dur = val & BMC150_ACCEL_SLOPE_DUR_MASK; 783 break; 784 default: 785 return -EINVAL; 786 } 787 788 return 0; 789 } 790 791 static int bmc150_accel_read_event_config(struct iio_dev *indio_dev, 792 const struct iio_chan_spec *chan, 793 enum iio_event_type type, 794 enum iio_event_direction dir) 795 { 796 struct bmc150_accel_data *data = iio_priv(indio_dev); 797 798 return data->ev_enable_state; 799 } 800 801 static int bmc150_accel_write_event_config(struct iio_dev *indio_dev, 802 const struct iio_chan_spec *chan, 803 enum iio_event_type type, 804 enum iio_event_direction dir, 805 bool state) 806 { 807 struct bmc150_accel_data *data = iio_priv(indio_dev); 808 int ret; 809 810 if (state == data->ev_enable_state) 811 return 0; 812 813 mutex_lock(&data->mutex); 814 815 ret = bmc150_accel_set_interrupt(data, BMC150_ACCEL_INT_ANY_MOTION, 816 state); 817 if (ret < 0) { 818 mutex_unlock(&data->mutex); 819 return ret; 820 } 821 822 data->ev_enable_state = state; 823 mutex_unlock(&data->mutex); 824 825 return 0; 826 } 827 828 static int bmc150_accel_validate_trigger(struct iio_dev *indio_dev, 829 struct iio_trigger *trig) 830 { 831 struct bmc150_accel_data *data = iio_priv(indio_dev); 832 int i; 833 834 for (i = 0; i < BMC150_ACCEL_TRIGGERS; i++) { 835 if (data->triggers[i].indio_trig == trig) 836 return 0; 837 } 838 839 return -EINVAL; 840 } 841 842 static ssize_t bmc150_accel_get_fifo_watermark(struct device *dev, 843 struct device_attribute *attr, 844 char *buf) 845 { 846 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 847 struct bmc150_accel_data *data = iio_priv(indio_dev); 848 int wm; 849 850 mutex_lock(&data->mutex); 851 wm = data->watermark; 852 mutex_unlock(&data->mutex); 853 854 return sysfs_emit(buf, "%d\n", wm); 855 } 856 857 static ssize_t bmc150_accel_get_fifo_state(struct device *dev, 858 struct device_attribute *attr, 859 char *buf) 860 { 861 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 862 struct bmc150_accel_data *data = iio_priv(indio_dev); 863 bool state; 864 865 mutex_lock(&data->mutex); 866 state = data->fifo_mode; 867 mutex_unlock(&data->mutex); 868 869 return sysfs_emit(buf, "%d\n", state); 870 } 871 872 static const struct iio_mount_matrix * 873 bmc150_accel_get_mount_matrix(const struct iio_dev *indio_dev, 874 const struct iio_chan_spec *chan) 875 { 876 struct bmc150_accel_data *data = iio_priv(indio_dev); 877 878 return &data->orientation; 879 } 880 881 static const struct iio_chan_spec_ext_info bmc150_accel_ext_info[] = { 882 IIO_MOUNT_MATRIX(IIO_SHARED_BY_DIR, bmc150_accel_get_mount_matrix), 883 { } 884 }; 885 886 IIO_STATIC_CONST_DEVICE_ATTR(hwfifo_watermark_min, "1"); 887 IIO_STATIC_CONST_DEVICE_ATTR(hwfifo_watermark_max, 888 __stringify(BMC150_ACCEL_FIFO_LENGTH)); 889 static IIO_DEVICE_ATTR(hwfifo_enabled, S_IRUGO, 890 bmc150_accel_get_fifo_state, NULL, 0); 891 static IIO_DEVICE_ATTR(hwfifo_watermark, S_IRUGO, 892 bmc150_accel_get_fifo_watermark, NULL, 0); 893 894 static const struct iio_dev_attr *bmc150_accel_fifo_attributes[] = { 895 &iio_dev_attr_hwfifo_watermark_min, 896 &iio_dev_attr_hwfifo_watermark_max, 897 &iio_dev_attr_hwfifo_watermark, 898 &iio_dev_attr_hwfifo_enabled, 899 NULL, 900 }; 901 902 static int bmc150_accel_set_watermark(struct iio_dev *indio_dev, unsigned val) 903 { 904 struct bmc150_accel_data *data = iio_priv(indio_dev); 905 906 if (val > BMC150_ACCEL_FIFO_LENGTH) 907 val = BMC150_ACCEL_FIFO_LENGTH; 908 909 mutex_lock(&data->mutex); 910 data->watermark = val; 911 mutex_unlock(&data->mutex); 912 913 return 0; 914 } 915 916 /* 917 * We must read at least one full frame in one burst, otherwise the rest of the 918 * frame data is discarded. 919 */ 920 static int bmc150_accel_fifo_transfer(struct bmc150_accel_data *data, 921 char *buffer, int samples) 922 { 923 struct device *dev = regmap_get_device(data->regmap); 924 int sample_length = 3 * 2; 925 int ret; 926 int total_length = samples * sample_length; 927 928 ret = regmap_raw_read(data->regmap, BMC150_ACCEL_REG_FIFO_DATA, 929 buffer, total_length); 930 if (ret) 931 dev_err(dev, 932 "Error transferring data from fifo: %d\n", ret); 933 934 return ret; 935 } 936 937 static int __bmc150_accel_fifo_flush(struct iio_dev *indio_dev, 938 unsigned samples, bool irq) 939 { 940 struct bmc150_accel_data *data = iio_priv(indio_dev); 941 struct device *dev = regmap_get_device(data->regmap); 942 int ret, i; 943 u8 count; 944 u16 buffer[BMC150_ACCEL_FIFO_LENGTH * 3]; 945 int64_t tstamp; 946 uint64_t sample_period; 947 unsigned int val; 948 949 ret = regmap_read(data->regmap, BMC150_ACCEL_REG_FIFO_STATUS, &val); 950 if (ret < 0) { 951 dev_err(dev, "Error reading reg_fifo_status\n"); 952 return ret; 953 } 954 955 count = val & 0x7F; 956 957 if (!count) 958 return 0; 959 960 /* 961 * If we getting called from IRQ handler we know the stored timestamp is 962 * fairly accurate for the last stored sample. Otherwise, if we are 963 * called as a result of a read operation from userspace and hence 964 * before the watermark interrupt was triggered, take a timestamp 965 * now. We can fall anywhere in between two samples so the error in this 966 * case is at most one sample period. 967 */ 968 if (!irq) { 969 data->old_timestamp = data->timestamp; 970 data->timestamp = iio_get_time_ns(indio_dev); 971 } 972 973 /* 974 * Approximate timestamps for each of the sample based on the sampling 975 * frequency, timestamp for last sample and number of samples. 976 * 977 * Note that we can't use the current bandwidth settings to compute the 978 * sample period because the sample rate varies with the device 979 * (e.g. between 31.70ms to 32.20ms for a bandwidth of 15.63HZ). That 980 * small variation adds when we store a large number of samples and 981 * creates significant jitter between the last and first samples in 982 * different batches (e.g. 32ms vs 21ms). 983 * 984 * To avoid this issue we compute the actual sample period ourselves 985 * based on the timestamp delta between the last two flush operations. 986 */ 987 sample_period = (data->timestamp - data->old_timestamp); 988 do_div(sample_period, count); 989 tstamp = data->timestamp - (count - 1) * sample_period; 990 991 if (samples && count > samples) 992 count = samples; 993 994 count = min_t(u8, count, BMC150_ACCEL_FIFO_LENGTH); 995 996 ret = bmc150_accel_fifo_transfer(data, (u8 *)buffer, count); 997 if (ret) 998 return ret; 999 1000 /* 1001 * Ideally we want the IIO core to handle the demux when running in fifo 1002 * mode but not when running in triggered buffer mode. Unfortunately 1003 * this does not seem to be possible, so stick with driver demux for 1004 * now. 1005 */ 1006 for (i = 0; i < count; i++) { 1007 int j, bit; 1008 1009 j = 0; 1010 iio_for_each_active_channel(indio_dev, bit) 1011 memcpy(&data->scan.channels[j++], &buffer[i * 3 + bit], 1012 sizeof(data->scan.channels[0])); 1013 1014 iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, 1015 tstamp); 1016 1017 tstamp += sample_period; 1018 } 1019 1020 return count; 1021 } 1022 1023 static int bmc150_accel_fifo_flush(struct iio_dev *indio_dev, unsigned samples) 1024 { 1025 struct bmc150_accel_data *data = iio_priv(indio_dev); 1026 int ret; 1027 1028 mutex_lock(&data->mutex); 1029 ret = __bmc150_accel_fifo_flush(indio_dev, samples, false); 1030 mutex_unlock(&data->mutex); 1031 1032 return ret; 1033 } 1034 1035 static IIO_CONST_ATTR_SAMP_FREQ_AVAIL( 1036 "15.620000 31.260000 62.50000 125 250 500 1000 2000"); 1037 1038 static struct attribute *bmc150_accel_attributes[] = { 1039 &iio_const_attr_sampling_frequency_available.dev_attr.attr, 1040 NULL, 1041 }; 1042 1043 static const struct attribute_group bmc150_accel_attrs_group = { 1044 .attrs = bmc150_accel_attributes, 1045 }; 1046 1047 static const struct iio_event_spec bmc150_accel_event = { 1048 .type = IIO_EV_TYPE_ROC, 1049 .dir = IIO_EV_DIR_EITHER, 1050 .mask_separate = BIT(IIO_EV_INFO_VALUE) | 1051 BIT(IIO_EV_INFO_ENABLE) | 1052 BIT(IIO_EV_INFO_PERIOD) 1053 }; 1054 1055 #define BMC150_ACCEL_CHANNEL(_axis, bits) { \ 1056 .type = IIO_ACCEL, \ 1057 .modified = 1, \ 1058 .channel2 = IIO_MOD_##_axis, \ 1059 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \ 1060 .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \ 1061 BIT(IIO_CHAN_INFO_SAMP_FREQ), \ 1062 .scan_index = AXIS_##_axis, \ 1063 .scan_type = { \ 1064 .sign = 's', \ 1065 .realbits = (bits), \ 1066 .storagebits = 16, \ 1067 .shift = 16 - (bits), \ 1068 .endianness = IIO_LE, \ 1069 }, \ 1070 .ext_info = bmc150_accel_ext_info, \ 1071 .event_spec = &bmc150_accel_event, \ 1072 .num_event_specs = 1 \ 1073 } 1074 1075 #define BMC150_ACCEL_CHANNELS(bits) { \ 1076 { \ 1077 .type = IIO_TEMP, \ 1078 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ 1079 BIT(IIO_CHAN_INFO_SCALE) | \ 1080 BIT(IIO_CHAN_INFO_OFFSET), \ 1081 .scan_index = -1, \ 1082 }, \ 1083 BMC150_ACCEL_CHANNEL(X, bits), \ 1084 BMC150_ACCEL_CHANNEL(Y, bits), \ 1085 BMC150_ACCEL_CHANNEL(Z, bits), \ 1086 IIO_CHAN_SOFT_TIMESTAMP(3), \ 1087 } 1088 1089 static const struct iio_chan_spec bma222e_accel_channels[] = 1090 BMC150_ACCEL_CHANNELS(8); 1091 static const struct iio_chan_spec bma250e_accel_channels[] = 1092 BMC150_ACCEL_CHANNELS(10); 1093 static const struct iio_chan_spec bmc150_accel_channels[] = 1094 BMC150_ACCEL_CHANNELS(12); 1095 static const struct iio_chan_spec bma280_accel_channels[] = 1096 BMC150_ACCEL_CHANNELS(14); 1097 1098 /* 1099 * The range for the Bosch sensors is typically +-2g/4g/8g/16g, distributed 1100 * over the amount of bits (see above). The scale table can be calculated using 1101 * (range / 2^bits) * g = (range / 2^bits) * 9.80665 m/s^2 1102 * e.g. for +-2g and 12 bits: (4 / 2^12) * 9.80665 m/s^2 = 0.0095768... m/s^2 1103 * Multiply 10^6 and round to get the values listed below. 1104 */ 1105 static const struct bmc150_accel_chip_info bmc150_accel_chip_info_tbl[] = { 1106 { 1107 .name = "BMA222", 1108 .chip_id = 0x03, 1109 .channels = bma222e_accel_channels, 1110 .num_channels = ARRAY_SIZE(bma222e_accel_channels), 1111 .scale_table = { {153229, BMC150_ACCEL_DEF_RANGE_2G}, 1112 {306458, BMC150_ACCEL_DEF_RANGE_4G}, 1113 {612916, BMC150_ACCEL_DEF_RANGE_8G}, 1114 {1225831, BMC150_ACCEL_DEF_RANGE_16G} }, 1115 }, 1116 { 1117 .name = "BMA222E", 1118 .chip_id = 0xF8, 1119 .channels = bma222e_accel_channels, 1120 .num_channels = ARRAY_SIZE(bma222e_accel_channels), 1121 .scale_table = { {153229, BMC150_ACCEL_DEF_RANGE_2G}, 1122 {306458, BMC150_ACCEL_DEF_RANGE_4G}, 1123 {612916, BMC150_ACCEL_DEF_RANGE_8G}, 1124 {1225831, BMC150_ACCEL_DEF_RANGE_16G} }, 1125 }, 1126 { 1127 .name = "BMA250E", 1128 .chip_id = 0xF9, 1129 .channels = bma250e_accel_channels, 1130 .num_channels = ARRAY_SIZE(bma250e_accel_channels), 1131 .scale_table = { {38307, BMC150_ACCEL_DEF_RANGE_2G}, 1132 {76614, BMC150_ACCEL_DEF_RANGE_4G}, 1133 {153229, BMC150_ACCEL_DEF_RANGE_8G}, 1134 {306458, BMC150_ACCEL_DEF_RANGE_16G} }, 1135 }, 1136 { 1137 .name = "BMA253/BMA254/BMA255/BMC150/BMC156/BMI055", 1138 .chip_id = 0xFA, 1139 .channels = bmc150_accel_channels, 1140 .num_channels = ARRAY_SIZE(bmc150_accel_channels), 1141 .scale_table = { {9577, BMC150_ACCEL_DEF_RANGE_2G}, 1142 {19154, BMC150_ACCEL_DEF_RANGE_4G}, 1143 {38307, BMC150_ACCEL_DEF_RANGE_8G}, 1144 {76614, BMC150_ACCEL_DEF_RANGE_16G} }, 1145 }, 1146 { 1147 .name = "BMA280", 1148 .chip_id = 0xFB, 1149 .channels = bma280_accel_channels, 1150 .num_channels = ARRAY_SIZE(bma280_accel_channels), 1151 .scale_table = { {2394, BMC150_ACCEL_DEF_RANGE_2G}, 1152 {4788, BMC150_ACCEL_DEF_RANGE_4G}, 1153 {9577, BMC150_ACCEL_DEF_RANGE_8G}, 1154 {19154, BMC150_ACCEL_DEF_RANGE_16G} }, 1155 }, 1156 }; 1157 1158 static const struct iio_info bmc150_accel_info = { 1159 .attrs = &bmc150_accel_attrs_group, 1160 .read_raw = bmc150_accel_read_raw, 1161 .write_raw = bmc150_accel_write_raw, 1162 .read_event_value = bmc150_accel_read_event, 1163 .write_event_value = bmc150_accel_write_event, 1164 .write_event_config = bmc150_accel_write_event_config, 1165 .read_event_config = bmc150_accel_read_event_config, 1166 }; 1167 1168 static const struct iio_info bmc150_accel_info_fifo = { 1169 .attrs = &bmc150_accel_attrs_group, 1170 .read_raw = bmc150_accel_read_raw, 1171 .write_raw = bmc150_accel_write_raw, 1172 .read_event_value = bmc150_accel_read_event, 1173 .write_event_value = bmc150_accel_write_event, 1174 .write_event_config = bmc150_accel_write_event_config, 1175 .read_event_config = bmc150_accel_read_event_config, 1176 .validate_trigger = bmc150_accel_validate_trigger, 1177 .hwfifo_set_watermark = bmc150_accel_set_watermark, 1178 .hwfifo_flush_to_buffer = bmc150_accel_fifo_flush, 1179 }; 1180 1181 static const unsigned long bmc150_accel_scan_masks[] = { 1182 BIT(AXIS_X) | BIT(AXIS_Y) | BIT(AXIS_Z), 1183 0}; 1184 1185 static irqreturn_t bmc150_accel_trigger_handler(int irq, void *p) 1186 { 1187 struct iio_poll_func *pf = p; 1188 struct iio_dev *indio_dev = pf->indio_dev; 1189 struct bmc150_accel_data *data = iio_priv(indio_dev); 1190 int ret; 1191 1192 mutex_lock(&data->mutex); 1193 ret = regmap_bulk_read(data->regmap, BMC150_ACCEL_REG_XOUT_L, 1194 data->buffer, AXIS_MAX * 2); 1195 mutex_unlock(&data->mutex); 1196 if (ret < 0) 1197 goto err_read; 1198 1199 iio_push_to_buffers_with_timestamp(indio_dev, data->buffer, 1200 pf->timestamp); 1201 err_read: 1202 iio_trigger_notify_done(indio_dev->trig); 1203 1204 return IRQ_HANDLED; 1205 } 1206 1207 static void bmc150_accel_trig_reen(struct iio_trigger *trig) 1208 { 1209 struct bmc150_accel_trigger *t = iio_trigger_get_drvdata(trig); 1210 struct bmc150_accel_data *data = t->data; 1211 struct device *dev = regmap_get_device(data->regmap); 1212 int ret; 1213 1214 /* new data interrupts don't need ack */ 1215 if (t == &t->data->triggers[BMC150_ACCEL_TRIGGER_DATA_READY]) 1216 return; 1217 1218 mutex_lock(&data->mutex); 1219 /* clear any latched interrupt */ 1220 ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH, 1221 BMC150_ACCEL_INT_MODE_LATCH_INT | 1222 BMC150_ACCEL_INT_MODE_LATCH_RESET); 1223 mutex_unlock(&data->mutex); 1224 if (ret < 0) 1225 dev_err(dev, "Error writing reg_int_rst_latch\n"); 1226 } 1227 1228 static int bmc150_accel_trigger_set_state(struct iio_trigger *trig, 1229 bool state) 1230 { 1231 struct bmc150_accel_trigger *t = iio_trigger_get_drvdata(trig); 1232 struct bmc150_accel_data *data = t->data; 1233 int ret; 1234 1235 mutex_lock(&data->mutex); 1236 1237 if (t->enabled == state) { 1238 mutex_unlock(&data->mutex); 1239 return 0; 1240 } 1241 1242 if (t->setup) { 1243 ret = t->setup(t, state); 1244 if (ret < 0) { 1245 mutex_unlock(&data->mutex); 1246 return ret; 1247 } 1248 } 1249 1250 ret = bmc150_accel_set_interrupt(data, t->intr, state); 1251 if (ret < 0) { 1252 mutex_unlock(&data->mutex); 1253 return ret; 1254 } 1255 1256 t->enabled = state; 1257 1258 mutex_unlock(&data->mutex); 1259 1260 return ret; 1261 } 1262 1263 static const struct iio_trigger_ops bmc150_accel_trigger_ops = { 1264 .set_trigger_state = bmc150_accel_trigger_set_state, 1265 .reenable = bmc150_accel_trig_reen, 1266 }; 1267 1268 static int bmc150_accel_handle_roc_event(struct iio_dev *indio_dev) 1269 { 1270 struct bmc150_accel_data *data = iio_priv(indio_dev); 1271 struct device *dev = regmap_get_device(data->regmap); 1272 int dir; 1273 int ret; 1274 unsigned int val; 1275 1276 ret = regmap_read(data->regmap, BMC150_ACCEL_REG_INT_STATUS_2, &val); 1277 if (ret < 0) { 1278 dev_err(dev, "Error reading reg_int_status_2\n"); 1279 return ret; 1280 } 1281 1282 if (val & BMC150_ACCEL_ANY_MOTION_BIT_SIGN) 1283 dir = IIO_EV_DIR_FALLING; 1284 else 1285 dir = IIO_EV_DIR_RISING; 1286 1287 if (val & BMC150_ACCEL_ANY_MOTION_BIT_X) 1288 iio_push_event(indio_dev, 1289 IIO_MOD_EVENT_CODE(IIO_ACCEL, 1290 0, 1291 IIO_MOD_X, 1292 IIO_EV_TYPE_ROC, 1293 dir), 1294 data->timestamp); 1295 1296 if (val & BMC150_ACCEL_ANY_MOTION_BIT_Y) 1297 iio_push_event(indio_dev, 1298 IIO_MOD_EVENT_CODE(IIO_ACCEL, 1299 0, 1300 IIO_MOD_Y, 1301 IIO_EV_TYPE_ROC, 1302 dir), 1303 data->timestamp); 1304 1305 if (val & BMC150_ACCEL_ANY_MOTION_BIT_Z) 1306 iio_push_event(indio_dev, 1307 IIO_MOD_EVENT_CODE(IIO_ACCEL, 1308 0, 1309 IIO_MOD_Z, 1310 IIO_EV_TYPE_ROC, 1311 dir), 1312 data->timestamp); 1313 1314 return ret; 1315 } 1316 1317 static irqreturn_t bmc150_accel_irq_thread_handler(int irq, void *private) 1318 { 1319 struct iio_dev *indio_dev = private; 1320 struct bmc150_accel_data *data = iio_priv(indio_dev); 1321 struct device *dev = regmap_get_device(data->regmap); 1322 bool ack = false; 1323 int ret; 1324 1325 mutex_lock(&data->mutex); 1326 1327 if (data->fifo_mode) { 1328 ret = __bmc150_accel_fifo_flush(indio_dev, 1329 BMC150_ACCEL_FIFO_LENGTH, true); 1330 if (ret > 0) 1331 ack = true; 1332 } 1333 1334 if (data->ev_enable_state) { 1335 ret = bmc150_accel_handle_roc_event(indio_dev); 1336 if (ret > 0) 1337 ack = true; 1338 } 1339 1340 if (ack) { 1341 ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH, 1342 BMC150_ACCEL_INT_MODE_LATCH_INT | 1343 BMC150_ACCEL_INT_MODE_LATCH_RESET); 1344 if (ret) 1345 dev_err(dev, "Error writing reg_int_rst_latch\n"); 1346 1347 ret = IRQ_HANDLED; 1348 } else { 1349 ret = IRQ_NONE; 1350 } 1351 1352 mutex_unlock(&data->mutex); 1353 1354 return ret; 1355 } 1356 1357 static irqreturn_t bmc150_accel_irq_handler(int irq, void *private) 1358 { 1359 struct iio_dev *indio_dev = private; 1360 struct bmc150_accel_data *data = iio_priv(indio_dev); 1361 bool ack = false; 1362 int i; 1363 1364 data->old_timestamp = data->timestamp; 1365 data->timestamp = iio_get_time_ns(indio_dev); 1366 1367 for (i = 0; i < BMC150_ACCEL_TRIGGERS; i++) { 1368 if (data->triggers[i].enabled) { 1369 iio_trigger_poll(data->triggers[i].indio_trig); 1370 ack = true; 1371 break; 1372 } 1373 } 1374 1375 if (data->ev_enable_state || data->fifo_mode) 1376 return IRQ_WAKE_THREAD; 1377 1378 if (ack) 1379 return IRQ_HANDLED; 1380 1381 return IRQ_NONE; 1382 } 1383 1384 static const struct { 1385 int intr; 1386 const char *name; 1387 int (*setup)(struct bmc150_accel_trigger *t, bool state); 1388 } bmc150_accel_triggers[BMC150_ACCEL_TRIGGERS] = { 1389 { 1390 .intr = 0, 1391 .name = "%s-dev%d", 1392 }, 1393 { 1394 .intr = 1, 1395 .name = "%s-any-motion-dev%d", 1396 .setup = bmc150_accel_any_motion_setup, 1397 }, 1398 }; 1399 1400 static void bmc150_accel_unregister_triggers(struct bmc150_accel_data *data, 1401 int from) 1402 { 1403 int i; 1404 1405 for (i = from; i >= 0; i--) { 1406 if (data->triggers[i].indio_trig) { 1407 iio_trigger_unregister(data->triggers[i].indio_trig); 1408 data->triggers[i].indio_trig = NULL; 1409 } 1410 } 1411 } 1412 1413 static int bmc150_accel_triggers_setup(struct iio_dev *indio_dev, 1414 struct bmc150_accel_data *data) 1415 { 1416 struct device *dev = regmap_get_device(data->regmap); 1417 int i, ret; 1418 1419 for (i = 0; i < BMC150_ACCEL_TRIGGERS; i++) { 1420 struct bmc150_accel_trigger *t = &data->triggers[i]; 1421 1422 t->indio_trig = devm_iio_trigger_alloc(dev, 1423 bmc150_accel_triggers[i].name, 1424 indio_dev->name, 1425 iio_device_id(indio_dev)); 1426 if (!t->indio_trig) { 1427 ret = -ENOMEM; 1428 break; 1429 } 1430 1431 t->indio_trig->ops = &bmc150_accel_trigger_ops; 1432 t->intr = bmc150_accel_triggers[i].intr; 1433 t->data = data; 1434 t->setup = bmc150_accel_triggers[i].setup; 1435 iio_trigger_set_drvdata(t->indio_trig, t); 1436 1437 ret = iio_trigger_register(t->indio_trig); 1438 if (ret) 1439 break; 1440 } 1441 1442 if (ret) 1443 bmc150_accel_unregister_triggers(data, i - 1); 1444 1445 return ret; 1446 } 1447 1448 #define BMC150_ACCEL_FIFO_MODE_STREAM 0x80 1449 #define BMC150_ACCEL_FIFO_MODE_FIFO 0x40 1450 #define BMC150_ACCEL_FIFO_MODE_BYPASS 0x00 1451 1452 static int bmc150_accel_fifo_set_mode(struct bmc150_accel_data *data) 1453 { 1454 struct device *dev = regmap_get_device(data->regmap); 1455 u8 reg = BMC150_ACCEL_REG_FIFO_CONFIG1; 1456 int ret; 1457 1458 ret = regmap_write(data->regmap, reg, data->fifo_mode); 1459 if (ret < 0) { 1460 dev_err(dev, "Error writing reg_fifo_config1\n"); 1461 return ret; 1462 } 1463 1464 if (!data->fifo_mode) 1465 return 0; 1466 1467 ret = regmap_write(data->regmap, BMC150_ACCEL_REG_FIFO_CONFIG0, 1468 data->watermark); 1469 if (ret < 0) 1470 dev_err(dev, "Error writing reg_fifo_config0\n"); 1471 1472 return ret; 1473 } 1474 1475 static int bmc150_accel_buffer_preenable(struct iio_dev *indio_dev) 1476 { 1477 struct bmc150_accel_data *data = iio_priv(indio_dev); 1478 1479 return bmc150_accel_set_power_state(data, true); 1480 } 1481 1482 static int bmc150_accel_buffer_postenable(struct iio_dev *indio_dev) 1483 { 1484 struct bmc150_accel_data *data = iio_priv(indio_dev); 1485 int ret = 0; 1486 1487 if (iio_device_get_current_mode(indio_dev) == INDIO_BUFFER_TRIGGERED) 1488 return 0; 1489 1490 mutex_lock(&data->mutex); 1491 1492 if (!data->watermark) 1493 goto out; 1494 1495 ret = bmc150_accel_set_interrupt(data, BMC150_ACCEL_INT_WATERMARK, 1496 true); 1497 if (ret) 1498 goto out; 1499 1500 data->fifo_mode = BMC150_ACCEL_FIFO_MODE_FIFO; 1501 1502 ret = bmc150_accel_fifo_set_mode(data); 1503 if (ret) { 1504 data->fifo_mode = 0; 1505 bmc150_accel_set_interrupt(data, BMC150_ACCEL_INT_WATERMARK, 1506 false); 1507 } 1508 1509 out: 1510 mutex_unlock(&data->mutex); 1511 1512 return ret; 1513 } 1514 1515 static int bmc150_accel_buffer_predisable(struct iio_dev *indio_dev) 1516 { 1517 struct bmc150_accel_data *data = iio_priv(indio_dev); 1518 1519 if (iio_device_get_current_mode(indio_dev) == INDIO_BUFFER_TRIGGERED) 1520 return 0; 1521 1522 mutex_lock(&data->mutex); 1523 1524 if (!data->fifo_mode) 1525 goto out; 1526 1527 bmc150_accel_set_interrupt(data, BMC150_ACCEL_INT_WATERMARK, false); 1528 __bmc150_accel_fifo_flush(indio_dev, BMC150_ACCEL_FIFO_LENGTH, false); 1529 data->fifo_mode = 0; 1530 bmc150_accel_fifo_set_mode(data); 1531 1532 out: 1533 mutex_unlock(&data->mutex); 1534 1535 return 0; 1536 } 1537 1538 static int bmc150_accel_buffer_postdisable(struct iio_dev *indio_dev) 1539 { 1540 struct bmc150_accel_data *data = iio_priv(indio_dev); 1541 1542 return bmc150_accel_set_power_state(data, false); 1543 } 1544 1545 static const struct iio_buffer_setup_ops bmc150_accel_buffer_ops = { 1546 .preenable = bmc150_accel_buffer_preenable, 1547 .postenable = bmc150_accel_buffer_postenable, 1548 .predisable = bmc150_accel_buffer_predisable, 1549 .postdisable = bmc150_accel_buffer_postdisable, 1550 }; 1551 1552 static int bmc150_accel_chip_init(struct bmc150_accel_data *data) 1553 { 1554 struct device *dev = regmap_get_device(data->regmap); 1555 int ret, i; 1556 unsigned int val; 1557 1558 /* 1559 * Reset chip to get it in a known good state. A delay of 1.8ms after 1560 * reset is required according to the data sheets of supported chips. 1561 */ 1562 regmap_write(data->regmap, BMC150_ACCEL_REG_RESET, 1563 BMC150_ACCEL_RESET_VAL); 1564 usleep_range(1800, 2500); 1565 1566 ret = regmap_read(data->regmap, BMC150_ACCEL_REG_CHIP_ID, &val); 1567 if (ret < 0) { 1568 dev_err(dev, "Error: Reading chip id\n"); 1569 return ret; 1570 } 1571 1572 dev_dbg(dev, "Chip Id %x\n", val); 1573 for (i = 0; i < ARRAY_SIZE(bmc150_accel_chip_info_tbl); i++) { 1574 if (bmc150_accel_chip_info_tbl[i].chip_id == val) { 1575 data->chip_info = &bmc150_accel_chip_info_tbl[i]; 1576 break; 1577 } 1578 } 1579 1580 if (!data->chip_info) { 1581 dev_err(dev, "Invalid chip %x\n", val); 1582 return -ENODEV; 1583 } 1584 1585 ret = bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_NORMAL, 0); 1586 if (ret < 0) 1587 return ret; 1588 1589 /* Set Bandwidth */ 1590 ret = bmc150_accel_set_bw(data, BMC150_ACCEL_DEF_BW, 0); 1591 if (ret < 0) 1592 return ret; 1593 1594 /* Set Default Range */ 1595 ret = regmap_write(data->regmap, BMC150_ACCEL_REG_PMU_RANGE, 1596 BMC150_ACCEL_DEF_RANGE_4G); 1597 if (ret < 0) { 1598 dev_err(dev, "Error writing reg_pmu_range\n"); 1599 return ret; 1600 } 1601 1602 data->range = BMC150_ACCEL_DEF_RANGE_4G; 1603 1604 /* Set default slope duration and thresholds */ 1605 data->slope_thres = BMC150_ACCEL_DEF_SLOPE_THRESHOLD; 1606 data->slope_dur = BMC150_ACCEL_DEF_SLOPE_DURATION; 1607 ret = bmc150_accel_update_slope(data); 1608 if (ret < 0) 1609 return ret; 1610 1611 /* Set default as latched interrupts */ 1612 ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH, 1613 BMC150_ACCEL_INT_MODE_LATCH_INT | 1614 BMC150_ACCEL_INT_MODE_LATCH_RESET); 1615 if (ret < 0) { 1616 dev_err(dev, "Error writing reg_int_rst_latch\n"); 1617 return ret; 1618 } 1619 1620 return 0; 1621 } 1622 1623 int bmc150_accel_core_probe(struct device *dev, struct regmap *regmap, int irq, 1624 enum bmc150_type type, const char *name, 1625 bool block_supported) 1626 { 1627 const struct iio_dev_attr **fifo_attrs; 1628 struct bmc150_accel_data *data; 1629 struct iio_dev *indio_dev; 1630 int ret; 1631 1632 indio_dev = devm_iio_device_alloc(dev, sizeof(*data)); 1633 if (!indio_dev) 1634 return -ENOMEM; 1635 1636 data = iio_priv(indio_dev); 1637 dev_set_drvdata(dev, indio_dev); 1638 1639 data->regmap = regmap; 1640 data->type = type; 1641 1642 if (!bmc150_apply_acpi_orientation(dev, &data->orientation)) { 1643 ret = iio_read_mount_matrix(dev, &data->orientation); 1644 if (ret) 1645 return ret; 1646 } 1647 1648 /* 1649 * VDD is the analog and digital domain voltage supply 1650 * VDDIO is the digital I/O voltage supply 1651 */ 1652 data->regulators[0].supply = "vdd"; 1653 data->regulators[1].supply = "vddio"; 1654 ret = devm_regulator_bulk_get(dev, 1655 ARRAY_SIZE(data->regulators), 1656 data->regulators); 1657 if (ret) 1658 return dev_err_probe(dev, ret, "failed to get regulators\n"); 1659 1660 ret = regulator_bulk_enable(ARRAY_SIZE(data->regulators), 1661 data->regulators); 1662 if (ret) { 1663 dev_err(dev, "failed to enable regulators: %d\n", ret); 1664 return ret; 1665 } 1666 /* 1667 * 2ms or 3ms power-on time according to datasheets, let's better 1668 * be safe than sorry and set this delay to 5ms. 1669 */ 1670 msleep(5); 1671 1672 ret = bmc150_accel_chip_init(data); 1673 if (ret < 0) 1674 goto err_disable_regulators; 1675 1676 mutex_init(&data->mutex); 1677 1678 indio_dev->channels = data->chip_info->channels; 1679 indio_dev->num_channels = data->chip_info->num_channels; 1680 indio_dev->name = name ? name : data->chip_info->name; 1681 indio_dev->available_scan_masks = bmc150_accel_scan_masks; 1682 indio_dev->modes = INDIO_DIRECT_MODE; 1683 indio_dev->info = &bmc150_accel_info; 1684 1685 if (block_supported) { 1686 indio_dev->modes |= INDIO_BUFFER_SOFTWARE; 1687 indio_dev->info = &bmc150_accel_info_fifo; 1688 fifo_attrs = bmc150_accel_fifo_attributes; 1689 } else { 1690 fifo_attrs = NULL; 1691 } 1692 1693 ret = iio_triggered_buffer_setup_ext(indio_dev, 1694 &iio_pollfunc_store_time, 1695 bmc150_accel_trigger_handler, 1696 IIO_BUFFER_DIRECTION_IN, 1697 &bmc150_accel_buffer_ops, 1698 fifo_attrs); 1699 if (ret < 0) { 1700 dev_err(dev, "Failed: iio triggered buffer setup\n"); 1701 goto err_disable_regulators; 1702 } 1703 1704 if (irq > 0) { 1705 data->irq = irq; 1706 ret = devm_request_threaded_irq(dev, irq, 1707 bmc150_accel_irq_handler, 1708 bmc150_accel_irq_thread_handler, 1709 IRQF_TRIGGER_RISING, 1710 "bmc150_accel_event", 1711 indio_dev); 1712 if (ret) 1713 goto err_buffer_cleanup; 1714 1715 /* 1716 * Set latched mode interrupt. While certain interrupts are 1717 * non-latched regardless of this settings (e.g. new data) we 1718 * want to use latch mode when we can to prevent interrupt 1719 * flooding. 1720 */ 1721 ret = regmap_write(data->regmap, BMC150_ACCEL_REG_INT_RST_LATCH, 1722 BMC150_ACCEL_INT_MODE_LATCH_RESET); 1723 if (ret < 0) { 1724 dev_err(dev, "Error writing reg_int_rst_latch\n"); 1725 goto err_buffer_cleanup; 1726 } 1727 1728 bmc150_accel_interrupts_setup(indio_dev, data, irq); 1729 1730 ret = bmc150_accel_triggers_setup(indio_dev, data); 1731 if (ret) 1732 goto err_buffer_cleanup; 1733 } 1734 1735 ret = pm_runtime_set_active(dev); 1736 if (ret) 1737 goto err_trigger_unregister; 1738 1739 pm_runtime_enable(dev); 1740 pm_runtime_set_autosuspend_delay(dev, BMC150_AUTO_SUSPEND_DELAY_MS); 1741 pm_runtime_use_autosuspend(dev); 1742 1743 ret = iio_device_register(indio_dev); 1744 if (ret < 0) { 1745 dev_err(dev, "Unable to register iio device\n"); 1746 goto err_pm_cleanup; 1747 } 1748 1749 return 0; 1750 1751 err_pm_cleanup: 1752 pm_runtime_dont_use_autosuspend(dev); 1753 pm_runtime_disable(dev); 1754 err_trigger_unregister: 1755 bmc150_accel_unregister_triggers(data, BMC150_ACCEL_TRIGGERS - 1); 1756 err_buffer_cleanup: 1757 iio_triggered_buffer_cleanup(indio_dev); 1758 err_disable_regulators: 1759 regulator_bulk_disable(ARRAY_SIZE(data->regulators), 1760 data->regulators); 1761 1762 return ret; 1763 } 1764 EXPORT_SYMBOL_NS_GPL(bmc150_accel_core_probe, "IIO_BMC150"); 1765 1766 void bmc150_accel_core_remove(struct device *dev) 1767 { 1768 struct iio_dev *indio_dev = dev_get_drvdata(dev); 1769 struct bmc150_accel_data *data = iio_priv(indio_dev); 1770 1771 iio_device_unregister(indio_dev); 1772 1773 pm_runtime_disable(dev); 1774 pm_runtime_set_suspended(dev); 1775 1776 bmc150_accel_unregister_triggers(data, BMC150_ACCEL_TRIGGERS - 1); 1777 1778 iio_triggered_buffer_cleanup(indio_dev); 1779 1780 mutex_lock(&data->mutex); 1781 bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_DEEP_SUSPEND, 0); 1782 mutex_unlock(&data->mutex); 1783 1784 regulator_bulk_disable(ARRAY_SIZE(data->regulators), 1785 data->regulators); 1786 } 1787 EXPORT_SYMBOL_NS_GPL(bmc150_accel_core_remove, "IIO_BMC150"); 1788 1789 #ifdef CONFIG_PM_SLEEP 1790 static int bmc150_accel_suspend(struct device *dev) 1791 { 1792 struct iio_dev *indio_dev = dev_get_drvdata(dev); 1793 struct bmc150_accel_data *data = iio_priv(indio_dev); 1794 1795 mutex_lock(&data->mutex); 1796 bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_SUSPEND, 0); 1797 mutex_unlock(&data->mutex); 1798 1799 return 0; 1800 } 1801 1802 static int bmc150_accel_resume(struct device *dev) 1803 { 1804 struct iio_dev *indio_dev = dev_get_drvdata(dev); 1805 struct bmc150_accel_data *data = iio_priv(indio_dev); 1806 1807 mutex_lock(&data->mutex); 1808 bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_NORMAL, 0); 1809 bmc150_accel_fifo_set_mode(data); 1810 mutex_unlock(&data->mutex); 1811 1812 if (data->resume_callback) 1813 data->resume_callback(dev); 1814 1815 return 0; 1816 } 1817 #endif 1818 1819 #ifdef CONFIG_PM 1820 static int bmc150_accel_runtime_suspend(struct device *dev) 1821 { 1822 struct iio_dev *indio_dev = dev_get_drvdata(dev); 1823 struct bmc150_accel_data *data = iio_priv(indio_dev); 1824 int ret; 1825 1826 ret = bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_SUSPEND, 0); 1827 if (ret < 0) 1828 return -EAGAIN; 1829 1830 return 0; 1831 } 1832 1833 static int bmc150_accel_runtime_resume(struct device *dev) 1834 { 1835 struct iio_dev *indio_dev = dev_get_drvdata(dev); 1836 struct bmc150_accel_data *data = iio_priv(indio_dev); 1837 int ret; 1838 int sleep_val; 1839 1840 ret = bmc150_accel_set_mode(data, BMC150_ACCEL_SLEEP_MODE_NORMAL, 0); 1841 if (ret < 0) 1842 return ret; 1843 ret = bmc150_accel_fifo_set_mode(data); 1844 if (ret < 0) 1845 return ret; 1846 1847 sleep_val = bmc150_accel_get_startup_times(data); 1848 if (sleep_val < 20) 1849 usleep_range(sleep_val * 1000, 20000); 1850 else 1851 msleep_interruptible(sleep_val); 1852 1853 return 0; 1854 } 1855 #endif 1856 1857 const struct dev_pm_ops bmc150_accel_pm_ops = { 1858 SET_SYSTEM_SLEEP_PM_OPS(bmc150_accel_suspend, bmc150_accel_resume) 1859 SET_RUNTIME_PM_OPS(bmc150_accel_runtime_suspend, 1860 bmc150_accel_runtime_resume, NULL) 1861 }; 1862 EXPORT_SYMBOL_NS_GPL(bmc150_accel_pm_ops, "IIO_BMC150"); 1863 1864 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>"); 1865 MODULE_LICENSE("GPL v2"); 1866 MODULE_DESCRIPTION("BMC150 accelerometer driver"); 1867