Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame] | 1 | /** |
| 2 | * opt3001.c - Texas Instruments OPT3001 Light Sensor |
| 3 | * |
| 4 | * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com |
| 5 | * |
| 6 | * Author: Andreas Dannenberg <dannenberg@ti.com> |
| 7 | * Based on previous work from: Felipe Balbi <balbi@ti.com> |
| 8 | * |
| 9 | * This program is free software: you can redistribute it and/or modify it |
| 10 | * under the terms of the GNU General Public License version 2 of the License |
| 11 | * as published by the Free Software Foundation. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 14 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 15 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 16 | * more details. |
| 17 | */ |
| 18 | |
| 19 | #include <linux/bitops.h> |
| 20 | #include <linux/delay.h> |
| 21 | #include <linux/device.h> |
| 22 | #include <linux/i2c.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/irq.h> |
| 25 | #include <linux/kernel.h> |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/mutex.h> |
| 28 | #include <linux/slab.h> |
| 29 | #include <linux/types.h> |
| 30 | |
| 31 | #include <linux/iio/events.h> |
| 32 | #include <linux/iio/iio.h> |
| 33 | #include <linux/iio/sysfs.h> |
| 34 | |
| 35 | #define OPT3001_RESULT 0x00 |
| 36 | #define OPT3001_CONFIGURATION 0x01 |
| 37 | #define OPT3001_LOW_LIMIT 0x02 |
| 38 | #define OPT3001_HIGH_LIMIT 0x03 |
| 39 | #define OPT3001_MANUFACTURER_ID 0x7e |
| 40 | #define OPT3001_DEVICE_ID 0x7f |
| 41 | |
| 42 | #define OPT3001_CONFIGURATION_RN_MASK (0xf << 12) |
| 43 | #define OPT3001_CONFIGURATION_RN_AUTO (0xc << 12) |
| 44 | |
| 45 | #define OPT3001_CONFIGURATION_CT BIT(11) |
| 46 | |
| 47 | #define OPT3001_CONFIGURATION_M_MASK (3 << 9) |
| 48 | #define OPT3001_CONFIGURATION_M_SHUTDOWN (0 << 9) |
| 49 | #define OPT3001_CONFIGURATION_M_SINGLE (1 << 9) |
| 50 | #define OPT3001_CONFIGURATION_M_CONTINUOUS (2 << 9) /* also 3 << 9 */ |
| 51 | |
| 52 | #define OPT3001_CONFIGURATION_OVF BIT(8) |
| 53 | #define OPT3001_CONFIGURATION_CRF BIT(7) |
| 54 | #define OPT3001_CONFIGURATION_FH BIT(6) |
| 55 | #define OPT3001_CONFIGURATION_FL BIT(5) |
| 56 | #define OPT3001_CONFIGURATION_L BIT(4) |
| 57 | #define OPT3001_CONFIGURATION_POL BIT(3) |
| 58 | #define OPT3001_CONFIGURATION_ME BIT(2) |
| 59 | |
| 60 | #define OPT3001_CONFIGURATION_FC_MASK (3 << 0) |
| 61 | |
| 62 | /* The end-of-conversion enable is located in the low-limit register */ |
| 63 | #define OPT3001_LOW_LIMIT_EOC_ENABLE 0xc000 |
| 64 | |
| 65 | #define OPT3001_REG_EXPONENT(n) ((n) >> 12) |
| 66 | #define OPT3001_REG_MANTISSA(n) ((n) & 0xfff) |
| 67 | |
| 68 | /* |
| 69 | * Time to wait for conversion result to be ready. The device datasheet |
| 70 | * worst-case max value is 880ms. Add some slack to be on the safe side. |
| 71 | */ |
| 72 | #define OPT3001_RESULT_READY_TIMEOUT msecs_to_jiffies(1000) |
| 73 | |
| 74 | struct opt3001 { |
| 75 | struct i2c_client *client; |
| 76 | struct device *dev; |
| 77 | |
| 78 | struct mutex lock; |
| 79 | u16 ok_to_ignore_lock:1; |
| 80 | u16 result_ready:1; |
| 81 | wait_queue_head_t result_ready_queue; |
| 82 | u16 result; |
| 83 | |
| 84 | u32 int_time; |
| 85 | u32 mode; |
| 86 | |
| 87 | u16 high_thresh_mantissa; |
| 88 | u16 low_thresh_mantissa; |
| 89 | |
| 90 | u8 high_thresh_exp; |
| 91 | u8 low_thresh_exp; |
| 92 | }; |
| 93 | |
| 94 | struct opt3001_scale { |
| 95 | int val; |
| 96 | int val2; |
| 97 | }; |
| 98 | |
| 99 | static const struct opt3001_scale opt3001_scales[] = { |
| 100 | { |
| 101 | .val = 40, |
| 102 | .val2 = 950000, |
| 103 | }, |
| 104 | { |
| 105 | .val = 81, |
| 106 | .val2 = 900000, |
| 107 | }, |
| 108 | { |
| 109 | .val = 163, |
| 110 | .val2 = 800000, |
| 111 | }, |
| 112 | { |
| 113 | .val = 327, |
| 114 | .val2 = 600000, |
| 115 | }, |
| 116 | { |
| 117 | .val = 655, |
| 118 | .val2 = 200000, |
| 119 | }, |
| 120 | { |
| 121 | .val = 1310, |
| 122 | .val2 = 400000, |
| 123 | }, |
| 124 | { |
| 125 | .val = 2620, |
| 126 | .val2 = 800000, |
| 127 | }, |
| 128 | { |
| 129 | .val = 5241, |
| 130 | .val2 = 600000, |
| 131 | }, |
| 132 | { |
| 133 | .val = 10483, |
| 134 | .val2 = 200000, |
| 135 | }, |
| 136 | { |
| 137 | .val = 20966, |
| 138 | .val2 = 400000, |
| 139 | }, |
| 140 | { |
| 141 | .val = 83865, |
| 142 | .val2 = 600000, |
| 143 | }, |
| 144 | }; |
| 145 | |
| 146 | static int opt3001_find_scale(const struct opt3001 *opt, int val, |
| 147 | int val2, u8 *exponent) |
| 148 | { |
| 149 | int i; |
| 150 | |
| 151 | for (i = 0; i < ARRAY_SIZE(opt3001_scales); i++) { |
| 152 | const struct opt3001_scale *scale = &opt3001_scales[i]; |
| 153 | |
| 154 | /* |
| 155 | * Combine the integer and micro parts for comparison |
| 156 | * purposes. Use milli lux precision to avoid 32-bit integer |
| 157 | * overflows. |
| 158 | */ |
| 159 | if ((val * 1000 + val2 / 1000) <= |
| 160 | (scale->val * 1000 + scale->val2 / 1000)) { |
| 161 | *exponent = i; |
| 162 | return 0; |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | return -EINVAL; |
| 167 | } |
| 168 | |
| 169 | static void opt3001_to_iio_ret(struct opt3001 *opt, u8 exponent, |
| 170 | u16 mantissa, int *val, int *val2) |
| 171 | { |
| 172 | int lux; |
| 173 | |
| 174 | lux = 10 * (mantissa << exponent); |
| 175 | *val = lux / 1000; |
| 176 | *val2 = (lux - (*val * 1000)) * 1000; |
| 177 | } |
| 178 | |
| 179 | static void opt3001_set_mode(struct opt3001 *opt, u16 *reg, u16 mode) |
| 180 | { |
| 181 | *reg &= ~OPT3001_CONFIGURATION_M_MASK; |
| 182 | *reg |= mode; |
| 183 | opt->mode = mode; |
| 184 | } |
| 185 | |
| 186 | static IIO_CONST_ATTR_INT_TIME_AVAIL("0.1 0.8"); |
| 187 | |
| 188 | static struct attribute *opt3001_attributes[] = { |
| 189 | &iio_const_attr_integration_time_available.dev_attr.attr, |
| 190 | NULL |
| 191 | }; |
| 192 | |
| 193 | static const struct attribute_group opt3001_attribute_group = { |
| 194 | .attrs = opt3001_attributes, |
| 195 | }; |
| 196 | |
| 197 | static const struct iio_event_spec opt3001_event_spec[] = { |
| 198 | { |
| 199 | .type = IIO_EV_TYPE_THRESH, |
| 200 | .dir = IIO_EV_DIR_RISING, |
| 201 | .mask_separate = BIT(IIO_EV_INFO_VALUE) | |
| 202 | BIT(IIO_EV_INFO_ENABLE), |
| 203 | }, |
| 204 | { |
| 205 | .type = IIO_EV_TYPE_THRESH, |
| 206 | .dir = IIO_EV_DIR_FALLING, |
| 207 | .mask_separate = BIT(IIO_EV_INFO_VALUE) | |
| 208 | BIT(IIO_EV_INFO_ENABLE), |
| 209 | }, |
| 210 | }; |
| 211 | |
| 212 | static const struct iio_chan_spec opt3001_channels[] = { |
| 213 | { |
| 214 | .type = IIO_LIGHT, |
| 215 | .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | |
| 216 | BIT(IIO_CHAN_INFO_INT_TIME), |
| 217 | .event_spec = opt3001_event_spec, |
| 218 | .num_event_specs = ARRAY_SIZE(opt3001_event_spec), |
| 219 | }, |
| 220 | IIO_CHAN_SOFT_TIMESTAMP(1), |
| 221 | }; |
| 222 | |
| 223 | static int opt3001_get_lux(struct opt3001 *opt, int *val, int *val2) |
| 224 | { |
| 225 | int ret; |
| 226 | u16 mantissa; |
| 227 | u16 reg; |
| 228 | u8 exponent; |
| 229 | u16 value; |
| 230 | |
| 231 | /* |
| 232 | * Enable the end-of-conversion interrupt mechanism. Note that doing |
| 233 | * so will overwrite the low-level limit value however we will restore |
| 234 | * this value later on. |
| 235 | */ |
| 236 | ret = i2c_smbus_write_word_swapped(opt->client, OPT3001_LOW_LIMIT, |
| 237 | OPT3001_LOW_LIMIT_EOC_ENABLE); |
| 238 | if (ret < 0) { |
| 239 | dev_err(opt->dev, "failed to write register %02x\n", |
| 240 | OPT3001_LOW_LIMIT); |
| 241 | return ret; |
| 242 | } |
| 243 | |
| 244 | /* Reset data-ready indicator flag (will be set in the IRQ routine) */ |
| 245 | opt->result_ready = false; |
| 246 | |
| 247 | /* Allow IRQ to access the device despite lock being set */ |
| 248 | opt->ok_to_ignore_lock = true; |
| 249 | |
| 250 | /* Configure for single-conversion mode and start a new conversion */ |
| 251 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_CONFIGURATION); |
| 252 | if (ret < 0) { |
| 253 | dev_err(opt->dev, "failed to read register %02x\n", |
| 254 | OPT3001_CONFIGURATION); |
| 255 | goto err; |
| 256 | } |
| 257 | |
| 258 | reg = ret; |
| 259 | opt3001_set_mode(opt, ®, OPT3001_CONFIGURATION_M_SINGLE); |
| 260 | |
| 261 | ret = i2c_smbus_write_word_swapped(opt->client, OPT3001_CONFIGURATION, |
| 262 | reg); |
| 263 | if (ret < 0) { |
| 264 | dev_err(opt->dev, "failed to write register %02x\n", |
| 265 | OPT3001_CONFIGURATION); |
| 266 | goto err; |
| 267 | } |
| 268 | |
| 269 | /* Wait for the IRQ to indicate the conversion is complete */ |
| 270 | ret = wait_event_timeout(opt->result_ready_queue, opt->result_ready, |
| 271 | OPT3001_RESULT_READY_TIMEOUT); |
| 272 | |
| 273 | err: |
| 274 | /* Disallow IRQ to access the device while lock is active */ |
| 275 | opt->ok_to_ignore_lock = false; |
| 276 | |
| 277 | if (ret == 0) |
| 278 | return -ETIMEDOUT; |
| 279 | else if (ret < 0) |
| 280 | return ret; |
| 281 | |
| 282 | /* |
| 283 | * Disable the end-of-conversion interrupt mechanism by restoring the |
| 284 | * low-level limit value (clearing OPT3001_LOW_LIMIT_EOC_ENABLE). Note |
| 285 | * that selectively clearing those enable bits would affect the actual |
| 286 | * limit value due to bit-overlap and therefore can't be done. |
| 287 | */ |
| 288 | value = (opt->low_thresh_exp << 12) | opt->low_thresh_mantissa; |
| 289 | ret = i2c_smbus_write_word_swapped(opt->client, OPT3001_LOW_LIMIT, |
| 290 | value); |
| 291 | if (ret < 0) { |
| 292 | dev_err(opt->dev, "failed to write register %02x\n", |
| 293 | OPT3001_LOW_LIMIT); |
| 294 | return ret; |
| 295 | } |
| 296 | |
| 297 | exponent = OPT3001_REG_EXPONENT(opt->result); |
| 298 | mantissa = OPT3001_REG_MANTISSA(opt->result); |
| 299 | |
| 300 | opt3001_to_iio_ret(opt, exponent, mantissa, val, val2); |
| 301 | |
| 302 | return IIO_VAL_INT_PLUS_MICRO; |
| 303 | } |
| 304 | |
| 305 | static int opt3001_get_int_time(struct opt3001 *opt, int *val, int *val2) |
| 306 | { |
| 307 | *val = 0; |
| 308 | *val2 = opt->int_time; |
| 309 | |
| 310 | return IIO_VAL_INT_PLUS_MICRO; |
| 311 | } |
| 312 | |
| 313 | static int opt3001_set_int_time(struct opt3001 *opt, int time) |
| 314 | { |
| 315 | int ret; |
| 316 | u16 reg; |
| 317 | |
| 318 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_CONFIGURATION); |
| 319 | if (ret < 0) { |
| 320 | dev_err(opt->dev, "failed to read register %02x\n", |
| 321 | OPT3001_CONFIGURATION); |
| 322 | return ret; |
| 323 | } |
| 324 | |
| 325 | reg = ret; |
| 326 | |
| 327 | switch (time) { |
| 328 | case 100000: |
| 329 | reg &= ~OPT3001_CONFIGURATION_CT; |
| 330 | opt->int_time = 100000; |
| 331 | break; |
| 332 | case 800000: |
| 333 | reg |= OPT3001_CONFIGURATION_CT; |
| 334 | opt->int_time = 800000; |
| 335 | break; |
| 336 | default: |
| 337 | return -EINVAL; |
| 338 | } |
| 339 | |
| 340 | return i2c_smbus_write_word_swapped(opt->client, OPT3001_CONFIGURATION, |
| 341 | reg); |
| 342 | } |
| 343 | |
| 344 | static int opt3001_read_raw(struct iio_dev *iio, |
| 345 | struct iio_chan_spec const *chan, int *val, int *val2, |
| 346 | long mask) |
| 347 | { |
| 348 | struct opt3001 *opt = iio_priv(iio); |
| 349 | int ret; |
| 350 | |
| 351 | if (opt->mode == OPT3001_CONFIGURATION_M_CONTINUOUS) |
| 352 | return -EBUSY; |
| 353 | |
| 354 | if (chan->type != IIO_LIGHT) |
| 355 | return -EINVAL; |
| 356 | |
| 357 | mutex_lock(&opt->lock); |
| 358 | |
| 359 | switch (mask) { |
| 360 | case IIO_CHAN_INFO_PROCESSED: |
| 361 | ret = opt3001_get_lux(opt, val, val2); |
| 362 | break; |
| 363 | case IIO_CHAN_INFO_INT_TIME: |
| 364 | ret = opt3001_get_int_time(opt, val, val2); |
| 365 | break; |
| 366 | default: |
| 367 | ret = -EINVAL; |
| 368 | } |
| 369 | |
| 370 | mutex_unlock(&opt->lock); |
| 371 | |
| 372 | return ret; |
| 373 | } |
| 374 | |
| 375 | static int opt3001_write_raw(struct iio_dev *iio, |
| 376 | struct iio_chan_spec const *chan, int val, int val2, |
| 377 | long mask) |
| 378 | { |
| 379 | struct opt3001 *opt = iio_priv(iio); |
| 380 | int ret; |
| 381 | |
| 382 | if (opt->mode == OPT3001_CONFIGURATION_M_CONTINUOUS) |
| 383 | return -EBUSY; |
| 384 | |
| 385 | if (chan->type != IIO_LIGHT) |
| 386 | return -EINVAL; |
| 387 | |
| 388 | if (mask != IIO_CHAN_INFO_INT_TIME) |
| 389 | return -EINVAL; |
| 390 | |
| 391 | if (val != 0) |
| 392 | return -EINVAL; |
| 393 | |
| 394 | mutex_lock(&opt->lock); |
| 395 | ret = opt3001_set_int_time(opt, val2); |
| 396 | mutex_unlock(&opt->lock); |
| 397 | |
| 398 | return ret; |
| 399 | } |
| 400 | |
| 401 | static int opt3001_read_event_value(struct iio_dev *iio, |
| 402 | const struct iio_chan_spec *chan, enum iio_event_type type, |
| 403 | enum iio_event_direction dir, enum iio_event_info info, |
| 404 | int *val, int *val2) |
| 405 | { |
| 406 | struct opt3001 *opt = iio_priv(iio); |
| 407 | int ret = IIO_VAL_INT_PLUS_MICRO; |
| 408 | |
| 409 | mutex_lock(&opt->lock); |
| 410 | |
| 411 | switch (dir) { |
| 412 | case IIO_EV_DIR_RISING: |
| 413 | opt3001_to_iio_ret(opt, opt->high_thresh_exp, |
| 414 | opt->high_thresh_mantissa, val, val2); |
| 415 | break; |
| 416 | case IIO_EV_DIR_FALLING: |
| 417 | opt3001_to_iio_ret(opt, opt->low_thresh_exp, |
| 418 | opt->low_thresh_mantissa, val, val2); |
| 419 | break; |
| 420 | default: |
| 421 | ret = -EINVAL; |
| 422 | } |
| 423 | |
| 424 | mutex_unlock(&opt->lock); |
| 425 | |
| 426 | return ret; |
| 427 | } |
| 428 | |
| 429 | static int opt3001_write_event_value(struct iio_dev *iio, |
| 430 | const struct iio_chan_spec *chan, enum iio_event_type type, |
| 431 | enum iio_event_direction dir, enum iio_event_info info, |
| 432 | int val, int val2) |
| 433 | { |
| 434 | struct opt3001 *opt = iio_priv(iio); |
| 435 | int ret; |
| 436 | |
| 437 | u16 mantissa; |
| 438 | u16 value; |
| 439 | u16 reg; |
| 440 | |
| 441 | u8 exponent; |
| 442 | |
| 443 | if (val < 0) |
| 444 | return -EINVAL; |
| 445 | |
| 446 | mutex_lock(&opt->lock); |
| 447 | |
| 448 | ret = opt3001_find_scale(opt, val, val2, &exponent); |
| 449 | if (ret < 0) { |
| 450 | dev_err(opt->dev, "can't find scale for %d.%06u\n", val, val2); |
| 451 | goto err; |
| 452 | } |
| 453 | |
| 454 | mantissa = (((val * 1000) + (val2 / 1000)) / 10) >> exponent; |
| 455 | value = (exponent << 12) | mantissa; |
| 456 | |
| 457 | switch (dir) { |
| 458 | case IIO_EV_DIR_RISING: |
| 459 | reg = OPT3001_HIGH_LIMIT; |
| 460 | opt->high_thresh_mantissa = mantissa; |
| 461 | opt->high_thresh_exp = exponent; |
| 462 | break; |
| 463 | case IIO_EV_DIR_FALLING: |
| 464 | reg = OPT3001_LOW_LIMIT; |
| 465 | opt->low_thresh_mantissa = mantissa; |
| 466 | opt->low_thresh_exp = exponent; |
| 467 | break; |
| 468 | default: |
| 469 | ret = -EINVAL; |
| 470 | goto err; |
| 471 | } |
| 472 | |
| 473 | ret = i2c_smbus_write_word_swapped(opt->client, reg, value); |
| 474 | if (ret < 0) { |
| 475 | dev_err(opt->dev, "failed to write register %02x\n", reg); |
| 476 | goto err; |
| 477 | } |
| 478 | |
| 479 | err: |
| 480 | mutex_unlock(&opt->lock); |
| 481 | |
| 482 | return ret; |
| 483 | } |
| 484 | |
| 485 | static int opt3001_read_event_config(struct iio_dev *iio, |
| 486 | const struct iio_chan_spec *chan, enum iio_event_type type, |
| 487 | enum iio_event_direction dir) |
| 488 | { |
| 489 | struct opt3001 *opt = iio_priv(iio); |
| 490 | |
| 491 | return opt->mode == OPT3001_CONFIGURATION_M_CONTINUOUS; |
| 492 | } |
| 493 | |
| 494 | static int opt3001_write_event_config(struct iio_dev *iio, |
| 495 | const struct iio_chan_spec *chan, enum iio_event_type type, |
| 496 | enum iio_event_direction dir, int state) |
| 497 | { |
| 498 | struct opt3001 *opt = iio_priv(iio); |
| 499 | int ret; |
| 500 | u16 mode; |
| 501 | u16 reg; |
| 502 | |
| 503 | if (state && opt->mode == OPT3001_CONFIGURATION_M_CONTINUOUS) |
| 504 | return 0; |
| 505 | |
| 506 | if (!state && opt->mode == OPT3001_CONFIGURATION_M_SHUTDOWN) |
| 507 | return 0; |
| 508 | |
| 509 | mutex_lock(&opt->lock); |
| 510 | |
| 511 | mode = state ? OPT3001_CONFIGURATION_M_CONTINUOUS |
| 512 | : OPT3001_CONFIGURATION_M_SHUTDOWN; |
| 513 | |
| 514 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_CONFIGURATION); |
| 515 | if (ret < 0) { |
| 516 | dev_err(opt->dev, "failed to read register %02x\n", |
| 517 | OPT3001_CONFIGURATION); |
| 518 | goto err; |
| 519 | } |
| 520 | |
| 521 | reg = ret; |
| 522 | opt3001_set_mode(opt, ®, mode); |
| 523 | |
| 524 | ret = i2c_smbus_write_word_swapped(opt->client, OPT3001_CONFIGURATION, |
| 525 | reg); |
| 526 | if (ret < 0) { |
| 527 | dev_err(opt->dev, "failed to write register %02x\n", |
| 528 | OPT3001_CONFIGURATION); |
| 529 | goto err; |
| 530 | } |
| 531 | |
| 532 | err: |
| 533 | mutex_unlock(&opt->lock); |
| 534 | |
| 535 | return ret; |
| 536 | } |
| 537 | |
| 538 | static const struct iio_info opt3001_info = { |
| 539 | .driver_module = THIS_MODULE, |
| 540 | .attrs = &opt3001_attribute_group, |
| 541 | .read_raw = opt3001_read_raw, |
| 542 | .write_raw = opt3001_write_raw, |
| 543 | .read_event_value = opt3001_read_event_value, |
| 544 | .write_event_value = opt3001_write_event_value, |
| 545 | .read_event_config = opt3001_read_event_config, |
| 546 | .write_event_config = opt3001_write_event_config, |
| 547 | }; |
| 548 | |
| 549 | static int opt3001_read_id(struct opt3001 *opt) |
| 550 | { |
| 551 | char manufacturer[2]; |
| 552 | u16 device_id; |
| 553 | int ret; |
| 554 | |
| 555 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_MANUFACTURER_ID); |
| 556 | if (ret < 0) { |
| 557 | dev_err(opt->dev, "failed to read register %02x\n", |
| 558 | OPT3001_MANUFACTURER_ID); |
| 559 | return ret; |
| 560 | } |
| 561 | |
| 562 | manufacturer[0] = ret >> 8; |
| 563 | manufacturer[1] = ret & 0xff; |
| 564 | |
| 565 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_DEVICE_ID); |
| 566 | if (ret < 0) { |
| 567 | dev_err(opt->dev, "failed to read register %02x\n", |
| 568 | OPT3001_DEVICE_ID); |
| 569 | return ret; |
| 570 | } |
| 571 | |
| 572 | device_id = ret; |
| 573 | |
| 574 | dev_info(opt->dev, "Found %c%c OPT%04x\n", manufacturer[0], |
| 575 | manufacturer[1], device_id); |
| 576 | |
| 577 | return 0; |
| 578 | } |
| 579 | |
| 580 | static int opt3001_configure(struct opt3001 *opt) |
| 581 | { |
| 582 | int ret; |
| 583 | u16 reg; |
| 584 | |
| 585 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_CONFIGURATION); |
| 586 | if (ret < 0) { |
| 587 | dev_err(opt->dev, "failed to read register %02x\n", |
| 588 | OPT3001_CONFIGURATION); |
| 589 | return ret; |
| 590 | } |
| 591 | |
| 592 | reg = ret; |
| 593 | |
| 594 | /* Enable automatic full-scale setting mode */ |
| 595 | reg &= ~OPT3001_CONFIGURATION_RN_MASK; |
| 596 | reg |= OPT3001_CONFIGURATION_RN_AUTO; |
| 597 | |
| 598 | /* Reflect status of the device's integration time setting */ |
| 599 | if (reg & OPT3001_CONFIGURATION_CT) |
| 600 | opt->int_time = 800000; |
| 601 | else |
| 602 | opt->int_time = 100000; |
| 603 | |
| 604 | /* Ensure device is in shutdown initially */ |
| 605 | opt3001_set_mode(opt, ®, OPT3001_CONFIGURATION_M_SHUTDOWN); |
| 606 | |
| 607 | /* Configure for latched window-style comparison operation */ |
| 608 | reg |= OPT3001_CONFIGURATION_L; |
| 609 | reg &= ~OPT3001_CONFIGURATION_POL; |
| 610 | reg &= ~OPT3001_CONFIGURATION_ME; |
| 611 | reg &= ~OPT3001_CONFIGURATION_FC_MASK; |
| 612 | |
| 613 | ret = i2c_smbus_write_word_swapped(opt->client, OPT3001_CONFIGURATION, |
| 614 | reg); |
| 615 | if (ret < 0) { |
| 616 | dev_err(opt->dev, "failed to write register %02x\n", |
| 617 | OPT3001_CONFIGURATION); |
| 618 | return ret; |
| 619 | } |
| 620 | |
| 621 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_LOW_LIMIT); |
| 622 | if (ret < 0) { |
| 623 | dev_err(opt->dev, "failed to read register %02x\n", |
| 624 | OPT3001_LOW_LIMIT); |
| 625 | return ret; |
| 626 | } |
| 627 | |
| 628 | opt->low_thresh_mantissa = OPT3001_REG_MANTISSA(ret); |
| 629 | opt->low_thresh_exp = OPT3001_REG_EXPONENT(ret); |
| 630 | |
| 631 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_HIGH_LIMIT); |
| 632 | if (ret < 0) { |
| 633 | dev_err(opt->dev, "failed to read register %02x\n", |
| 634 | OPT3001_HIGH_LIMIT); |
| 635 | return ret; |
| 636 | } |
| 637 | |
| 638 | opt->high_thresh_mantissa = OPT3001_REG_MANTISSA(ret); |
| 639 | opt->high_thresh_exp = OPT3001_REG_EXPONENT(ret); |
| 640 | |
| 641 | return 0; |
| 642 | } |
| 643 | |
| 644 | static irqreturn_t opt3001_irq(int irq, void *_iio) |
| 645 | { |
| 646 | struct iio_dev *iio = _iio; |
| 647 | struct opt3001 *opt = iio_priv(iio); |
| 648 | int ret; |
| 649 | |
| 650 | if (!opt->ok_to_ignore_lock) |
| 651 | mutex_lock(&opt->lock); |
| 652 | |
| 653 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_CONFIGURATION); |
| 654 | if (ret < 0) { |
| 655 | dev_err(opt->dev, "failed to read register %02x\n", |
| 656 | OPT3001_CONFIGURATION); |
| 657 | goto out; |
| 658 | } |
| 659 | |
| 660 | if ((ret & OPT3001_CONFIGURATION_M_MASK) == |
| 661 | OPT3001_CONFIGURATION_M_CONTINUOUS) { |
| 662 | if (ret & OPT3001_CONFIGURATION_FH) |
| 663 | iio_push_event(iio, |
| 664 | IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0, |
| 665 | IIO_EV_TYPE_THRESH, |
| 666 | IIO_EV_DIR_RISING), |
| 667 | iio_get_time_ns()); |
| 668 | if (ret & OPT3001_CONFIGURATION_FL) |
| 669 | iio_push_event(iio, |
| 670 | IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0, |
| 671 | IIO_EV_TYPE_THRESH, |
| 672 | IIO_EV_DIR_FALLING), |
| 673 | iio_get_time_ns()); |
| 674 | } else if (ret & OPT3001_CONFIGURATION_CRF) { |
| 675 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_RESULT); |
| 676 | if (ret < 0) { |
| 677 | dev_err(opt->dev, "failed to read register %02x\n", |
| 678 | OPT3001_RESULT); |
| 679 | goto out; |
| 680 | } |
| 681 | opt->result = ret; |
| 682 | opt->result_ready = true; |
| 683 | wake_up(&opt->result_ready_queue); |
| 684 | } |
| 685 | |
| 686 | out: |
| 687 | if (!opt->ok_to_ignore_lock) |
| 688 | mutex_unlock(&opt->lock); |
| 689 | |
| 690 | return IRQ_HANDLED; |
| 691 | } |
| 692 | |
| 693 | static int opt3001_probe(struct i2c_client *client, |
| 694 | const struct i2c_device_id *id) |
| 695 | { |
| 696 | struct device *dev = &client->dev; |
| 697 | |
| 698 | struct iio_dev *iio; |
| 699 | struct opt3001 *opt; |
| 700 | int irq = client->irq; |
| 701 | int ret; |
| 702 | |
| 703 | iio = devm_iio_device_alloc(dev, sizeof(*opt)); |
| 704 | if (!iio) |
| 705 | return -ENOMEM; |
| 706 | |
| 707 | opt = iio_priv(iio); |
| 708 | opt->client = client; |
| 709 | opt->dev = dev; |
| 710 | |
| 711 | mutex_init(&opt->lock); |
| 712 | init_waitqueue_head(&opt->result_ready_queue); |
| 713 | i2c_set_clientdata(client, iio); |
| 714 | |
| 715 | ret = opt3001_read_id(opt); |
| 716 | if (ret) |
| 717 | return ret; |
| 718 | |
| 719 | ret = opt3001_configure(opt); |
| 720 | if (ret) |
| 721 | return ret; |
| 722 | |
| 723 | iio->name = client->name; |
| 724 | iio->channels = opt3001_channels; |
| 725 | iio->num_channels = ARRAY_SIZE(opt3001_channels); |
| 726 | iio->dev.parent = dev; |
| 727 | iio->modes = INDIO_DIRECT_MODE; |
| 728 | iio->info = &opt3001_info; |
| 729 | |
| 730 | ret = devm_iio_device_register(dev, iio); |
| 731 | if (ret) { |
| 732 | dev_err(dev, "failed to register IIO device\n"); |
| 733 | return ret; |
| 734 | } |
| 735 | |
| 736 | ret = request_threaded_irq(irq, NULL, opt3001_irq, |
| 737 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
| 738 | "opt3001", iio); |
| 739 | if (ret) { |
| 740 | dev_err(dev, "failed to request IRQ #%d\n", irq); |
| 741 | return ret; |
| 742 | } |
| 743 | |
| 744 | return 0; |
| 745 | } |
| 746 | |
| 747 | static int opt3001_remove(struct i2c_client *client) |
| 748 | { |
| 749 | struct iio_dev *iio = i2c_get_clientdata(client); |
| 750 | struct opt3001 *opt = iio_priv(iio); |
| 751 | int ret; |
| 752 | u16 reg; |
| 753 | |
| 754 | free_irq(client->irq, iio); |
| 755 | |
| 756 | ret = i2c_smbus_read_word_swapped(opt->client, OPT3001_CONFIGURATION); |
| 757 | if (ret < 0) { |
| 758 | dev_err(opt->dev, "failed to read register %02x\n", |
| 759 | OPT3001_CONFIGURATION); |
| 760 | return ret; |
| 761 | } |
| 762 | |
| 763 | reg = ret; |
| 764 | opt3001_set_mode(opt, ®, OPT3001_CONFIGURATION_M_SHUTDOWN); |
| 765 | |
| 766 | ret = i2c_smbus_write_word_swapped(opt->client, OPT3001_CONFIGURATION, |
| 767 | reg); |
| 768 | if (ret < 0) { |
| 769 | dev_err(opt->dev, "failed to write register %02x\n", |
| 770 | OPT3001_CONFIGURATION); |
| 771 | return ret; |
| 772 | } |
| 773 | |
| 774 | return 0; |
| 775 | } |
| 776 | |
| 777 | static const struct i2c_device_id opt3001_id[] = { |
| 778 | { "opt3001", 0 }, |
| 779 | { } /* Terminating Entry */ |
| 780 | }; |
| 781 | MODULE_DEVICE_TABLE(i2c, opt3001_id); |
| 782 | |
| 783 | static const struct of_device_id opt3001_of_match[] = { |
| 784 | { .compatible = "ti,opt3001" }, |
| 785 | { } |
| 786 | }; |
| 787 | |
| 788 | static struct i2c_driver opt3001_driver = { |
| 789 | .probe = opt3001_probe, |
| 790 | .remove = opt3001_remove, |
| 791 | .id_table = opt3001_id, |
| 792 | |
| 793 | .driver = { |
| 794 | .name = "opt3001", |
| 795 | .of_match_table = of_match_ptr(opt3001_of_match), |
| 796 | }, |
| 797 | }; |
| 798 | |
| 799 | module_i2c_driver(opt3001_driver); |
| 800 | |
| 801 | MODULE_LICENSE("GPL v2"); |
| 802 | MODULE_AUTHOR("Andreas Dannenberg <dannenberg@ti.com>"); |
| 803 | MODULE_DESCRIPTION("Texas Instruments OPT3001 Light Sensor Driver"); |