1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (C) 2021 Joe Sandom <joe.g.sandom@gmail.com> 4 * 5 * Datasheet: https://ams.com/tsl25911#tab/documents 6 * 7 * Device driver for the TAOS TSL2591. This is a very-high sensitivity 8 * light-to-digital converter that transforms light intensity into a digital 9 * signal. 10 */ 11 12 #include <linux/bitfield.h> 13 #include <linux/debugfs.h> 14 #include <linux/delay.h> 15 #include <linux/i2c.h> 16 #include <linux/interrupt.h> 17 #include <linux/iopoll.h> 18 #include <linux/kernel.h> 19 #include <linux/module.h> 20 #include <linux/mutex.h> 21 #include <linux/pm_runtime.h> 22 #include <linux/sysfs.h> 23 24 #include <asm/unaligned.h> 25 26 #include <linux/iio/events.h> 27 #include <linux/iio/iio.h> 28 #include <linux/iio/sysfs.h> 29 30 /* ADC integration time, field value to time in ms */ 31 #define TSL2591_FVAL_TO_MSEC(x) (((x) + 1) * 100) 32 /* ADC integration time, field value to time in seconds */ 33 #define TSL2591_FVAL_TO_SEC(x) ((x) + 1) 34 /* ADC integration time, time in seconds to field value */ 35 #define TSL2591_SEC_TO_FVAL(x) ((x) - 1) 36 37 /* TSL2591 register set */ 38 #define TSL2591_ENABLE 0x00 39 #define TSL2591_CONTROL 0x01 40 #define TSL2591_AILTL 0x04 41 #define TSL2591_AILTH 0x05 42 #define TSL2591_AIHTL 0x06 43 #define TSL2591_AIHTH 0x07 44 #define TSL2591_NP_AILTL 0x08 45 #define TSL2591_NP_AILTH 0x09 46 #define TSL2591_NP_AIHTL 0x0A 47 #define TSL2591_NP_AIHTH 0x0B 48 #define TSL2591_PERSIST 0x0C 49 #define TSL2591_PACKAGE_ID 0x11 50 #define TSL2591_DEVICE_ID 0x12 51 #define TSL2591_STATUS 0x13 52 #define TSL2591_C0_DATAL 0x14 53 #define TSL2591_C0_DATAH 0x15 54 #define TSL2591_C1_DATAL 0x16 55 #define TSL2591_C1_DATAH 0x17 56 57 /* TSL2591 command register definitions */ 58 #define TSL2591_CMD_NOP 0xA0 59 #define TSL2591_CMD_SF_INTSET 0xE4 60 #define TSL2591_CMD_SF_CALS_I 0xE5 61 #define TSL2591_CMD_SF_CALS_NPI 0xE7 62 #define TSL2591_CMD_SF_CNP_ALSI 0xEA 63 64 /* TSL2591 enable register definitions */ 65 #define TSL2591_PWR_ON 0x01 66 #define TSL2591_PWR_OFF 0x00 67 #define TSL2591_ENABLE_ALS 0x02 68 #define TSL2591_ENABLE_ALS_INT 0x10 69 #define TSL2591_ENABLE_SLEEP_INT 0x40 70 #define TSL2591_ENABLE_NP_INT 0x80 71 72 /* TSL2591 control register definitions */ 73 #define TSL2591_CTRL_ALS_INTEGRATION_100MS 0x00 74 #define TSL2591_CTRL_ALS_INTEGRATION_200MS 0x01 75 #define TSL2591_CTRL_ALS_INTEGRATION_300MS 0x02 76 #define TSL2591_CTRL_ALS_INTEGRATION_400MS 0x03 77 #define TSL2591_CTRL_ALS_INTEGRATION_500MS 0x04 78 #define TSL2591_CTRL_ALS_INTEGRATION_600MS 0x05 79 #define TSL2591_CTRL_ALS_LOW_GAIN 0x00 80 #define TSL2591_CTRL_ALS_MED_GAIN 0x10 81 #define TSL2591_CTRL_ALS_HIGH_GAIN 0x20 82 #define TSL2591_CTRL_ALS_MAX_GAIN 0x30 83 #define TSL2591_CTRL_SYS_RESET 0x80 84 85 /* TSL2591 persist register definitions */ 86 #define TSL2591_PRST_ALS_INT_CYCLE_0 0x00 87 #define TSL2591_PRST_ALS_INT_CYCLE_ANY 0x01 88 #define TSL2591_PRST_ALS_INT_CYCLE_2 0x02 89 #define TSL2591_PRST_ALS_INT_CYCLE_3 0x03 90 #define TSL2591_PRST_ALS_INT_CYCLE_5 0x04 91 #define TSL2591_PRST_ALS_INT_CYCLE_10 0x05 92 #define TSL2591_PRST_ALS_INT_CYCLE_15 0x06 93 #define TSL2591_PRST_ALS_INT_CYCLE_20 0x07 94 #define TSL2591_PRST_ALS_INT_CYCLE_25 0x08 95 #define TSL2591_PRST_ALS_INT_CYCLE_30 0x09 96 #define TSL2591_PRST_ALS_INT_CYCLE_35 0x0A 97 #define TSL2591_PRST_ALS_INT_CYCLE_40 0x0B 98 #define TSL2591_PRST_ALS_INT_CYCLE_45 0x0C 99 #define TSL2591_PRST_ALS_INT_CYCLE_50 0x0D 100 #define TSL2591_PRST_ALS_INT_CYCLE_55 0x0E 101 #define TSL2591_PRST_ALS_INT_CYCLE_60 0x0F 102 #define TSL2591_PRST_ALS_INT_CYCLE_MAX (BIT(4) - 1) 103 104 /* TSL2591 PID register mask */ 105 #define TSL2591_PACKAGE_ID_MASK GENMASK(5, 4) 106 107 /* TSL2591 ID register mask */ 108 #define TSL2591_DEVICE_ID_MASK GENMASK(7, 0) 109 110 /* TSL2591 status register masks */ 111 #define TSL2591_STS_ALS_VALID_MASK BIT(0) 112 #define TSL2591_STS_ALS_INT_MASK BIT(4) 113 #define TSL2591_STS_NPERS_INT_MASK BIT(5) 114 #define TSL2591_STS_VAL_HIGH_MASK BIT(0) 115 116 /* TSL2591 constant values */ 117 #define TSL2591_PACKAGE_ID_VAL 0x00 118 #define TSL2591_DEVICE_ID_VAL 0x50 119 120 /* Power off suspend delay time MS */ 121 #define TSL2591_POWER_OFF_DELAY_MS 2000 122 123 /* TSL2591 default values */ 124 #define TSL2591_DEFAULT_ALS_INT_TIME TSL2591_CTRL_ALS_INTEGRATION_300MS 125 #define TSL2591_DEFAULT_ALS_GAIN TSL2591_CTRL_ALS_MED_GAIN 126 #define TSL2591_DEFAULT_ALS_PERSIST TSL2591_PRST_ALS_INT_CYCLE_ANY 127 #define TSL2591_DEFAULT_ALS_LOWER_THRESH 100 128 #define TSL2591_DEFAULT_ALS_UPPER_THRESH 1500 129 130 /* TSL2591 number of data registers */ 131 #define TSL2591_NUM_DATA_REGISTERS 4 132 133 /* TSL2591 number of valid status reads on ADC complete */ 134 #define TSL2591_ALS_STS_VALID_COUNT 10 135 136 /* TSL2591 delay period between polls when checking for ALS valid flag */ 137 #define TSL2591_DELAY_PERIOD_US 10000 138 139 /* TSL2591 maximum values */ 140 #define TSL2591_MAX_ALS_INT_TIME_MS 600 141 #define TSL2591_ALS_MAX_VALUE (BIT(16) - 1) 142 143 /* 144 * LUX calculations; 145 * AGAIN values from Adafruit's TSL2591 Arduino library 146 * https://github.com/adafruit/Adafruit_TSL2591_Library 147 */ 148 #define TSL2591_CTRL_ALS_LOW_GAIN_MULTIPLIER 1 149 #define TSL2591_CTRL_ALS_MED_GAIN_MULTIPLIER 25 150 #define TSL2591_CTRL_ALS_HIGH_GAIN_MULTIPLIER 428 151 #define TSL2591_CTRL_ALS_MAX_GAIN_MULTIPLIER 9876 152 #define TSL2591_LUX_COEFFICIENT 408 153 154 struct tsl2591_als_settings { 155 u16 als_lower_thresh; 156 u16 als_upper_thresh; 157 u8 als_int_time; 158 u8 als_persist; 159 u8 als_gain; 160 }; 161 162 struct tsl2591_chip { 163 struct tsl2591_als_settings als_settings; 164 struct i2c_client *client; 165 /* 166 * Keep als_settings in sync with hardware state 167 * and ensure multiple readers are serialized. 168 */ 169 struct mutex als_mutex; 170 bool events_enabled; 171 }; 172 173 /* 174 * Period table is ALS persist cycle x integration time setting 175 * Integration times: 100ms, 200ms, 300ms, 400ms, 500ms, 600ms 176 * ALS cycles: 1, 2, 3, 5, 10, 20, 25, 30, 35, 40, 45, 50, 55, 60 177 */ 178 static const char * const tsl2591_als_period_list[] = { 179 "0.1 0.2 0.3 0.5 1.0 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0", 180 "0.2 0.4 0.6 1.0 2.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0 12.0", 181 "0.3 0.6 0.9 1.5 3.0 6.0 7.5 9.0 10.5 12.0 13.5 15.0 16.5 18.0", 182 "0.4 0.8 1.2 2.0 4.0 8.0 10.0 12.0 14.0 16.0 18.0 20.0 22.0 24.0", 183 "0.5 1.0 1.5 2.5 5.0 10.0 12.5 15.0 17.5 20.0 22.5 25.0 27.5 30.0", 184 "0.6 1.2 1.8 3.0 6.0 12.0 15.0 18.0 21.0 24.0 27.0 30.0 33.0 36.0", 185 }; 186 187 static const int tsl2591_int_time_available[] = { 188 1, 2, 3, 4, 5, 6, 189 }; 190 191 static const int tsl2591_calibscale_available[] = { 192 1, 25, 428, 9876, 193 }; 194 195 static int tsl2591_set_als_lower_threshold(struct tsl2591_chip *chip, 196 u16 als_lower_threshold); 197 static int tsl2591_set_als_upper_threshold(struct tsl2591_chip *chip, 198 u16 als_upper_threshold); 199 200 static int tsl2591_gain_to_multiplier(const u8 als_gain) 201 { 202 switch (als_gain) { 203 case TSL2591_CTRL_ALS_LOW_GAIN: 204 return TSL2591_CTRL_ALS_LOW_GAIN_MULTIPLIER; 205 case TSL2591_CTRL_ALS_MED_GAIN: 206 return TSL2591_CTRL_ALS_MED_GAIN_MULTIPLIER; 207 case TSL2591_CTRL_ALS_HIGH_GAIN: 208 return TSL2591_CTRL_ALS_HIGH_GAIN_MULTIPLIER; 209 case TSL2591_CTRL_ALS_MAX_GAIN: 210 return TSL2591_CTRL_ALS_MAX_GAIN_MULTIPLIER; 211 default: 212 return -EINVAL; 213 } 214 } 215 216 static int tsl2591_multiplier_to_gain(const u32 multiplier) 217 { 218 switch (multiplier) { 219 case TSL2591_CTRL_ALS_LOW_GAIN_MULTIPLIER: 220 return TSL2591_CTRL_ALS_LOW_GAIN; 221 case TSL2591_CTRL_ALS_MED_GAIN_MULTIPLIER: 222 return TSL2591_CTRL_ALS_MED_GAIN; 223 case TSL2591_CTRL_ALS_HIGH_GAIN_MULTIPLIER: 224 return TSL2591_CTRL_ALS_HIGH_GAIN; 225 case TSL2591_CTRL_ALS_MAX_GAIN_MULTIPLIER: 226 return TSL2591_CTRL_ALS_MAX_GAIN; 227 default: 228 return -EINVAL; 229 } 230 } 231 232 static int tsl2591_persist_cycle_to_lit(const u8 als_persist) 233 { 234 switch (als_persist) { 235 case TSL2591_PRST_ALS_INT_CYCLE_ANY: 236 return 1; 237 case TSL2591_PRST_ALS_INT_CYCLE_2: 238 return 2; 239 case TSL2591_PRST_ALS_INT_CYCLE_3: 240 return 3; 241 case TSL2591_PRST_ALS_INT_CYCLE_5: 242 return 5; 243 case TSL2591_PRST_ALS_INT_CYCLE_10: 244 return 10; 245 case TSL2591_PRST_ALS_INT_CYCLE_15: 246 return 15; 247 case TSL2591_PRST_ALS_INT_CYCLE_20: 248 return 20; 249 case TSL2591_PRST_ALS_INT_CYCLE_25: 250 return 25; 251 case TSL2591_PRST_ALS_INT_CYCLE_30: 252 return 30; 253 case TSL2591_PRST_ALS_INT_CYCLE_35: 254 return 35; 255 case TSL2591_PRST_ALS_INT_CYCLE_40: 256 return 40; 257 case TSL2591_PRST_ALS_INT_CYCLE_45: 258 return 45; 259 case TSL2591_PRST_ALS_INT_CYCLE_50: 260 return 50; 261 case TSL2591_PRST_ALS_INT_CYCLE_55: 262 return 55; 263 case TSL2591_PRST_ALS_INT_CYCLE_60: 264 return 60; 265 default: 266 return -EINVAL; 267 } 268 } 269 270 static int tsl2591_persist_lit_to_cycle(const u8 als_persist) 271 { 272 switch (als_persist) { 273 case 1: 274 return TSL2591_PRST_ALS_INT_CYCLE_ANY; 275 case 2: 276 return TSL2591_PRST_ALS_INT_CYCLE_2; 277 case 3: 278 return TSL2591_PRST_ALS_INT_CYCLE_3; 279 case 5: 280 return TSL2591_PRST_ALS_INT_CYCLE_5; 281 case 10: 282 return TSL2591_PRST_ALS_INT_CYCLE_10; 283 case 15: 284 return TSL2591_PRST_ALS_INT_CYCLE_15; 285 case 20: 286 return TSL2591_PRST_ALS_INT_CYCLE_20; 287 case 25: 288 return TSL2591_PRST_ALS_INT_CYCLE_25; 289 case 30: 290 return TSL2591_PRST_ALS_INT_CYCLE_30; 291 case 35: 292 return TSL2591_PRST_ALS_INT_CYCLE_35; 293 case 40: 294 return TSL2591_PRST_ALS_INT_CYCLE_40; 295 case 45: 296 return TSL2591_PRST_ALS_INT_CYCLE_45; 297 case 50: 298 return TSL2591_PRST_ALS_INT_CYCLE_50; 299 case 55: 300 return TSL2591_PRST_ALS_INT_CYCLE_55; 301 case 60: 302 return TSL2591_PRST_ALS_INT_CYCLE_60; 303 default: 304 return -EINVAL; 305 } 306 } 307 308 static int tsl2591_compatible_int_time(struct tsl2591_chip *chip, 309 const u32 als_integration_time) 310 { 311 switch (als_integration_time) { 312 case TSL2591_CTRL_ALS_INTEGRATION_100MS: 313 case TSL2591_CTRL_ALS_INTEGRATION_200MS: 314 case TSL2591_CTRL_ALS_INTEGRATION_300MS: 315 case TSL2591_CTRL_ALS_INTEGRATION_400MS: 316 case TSL2591_CTRL_ALS_INTEGRATION_500MS: 317 case TSL2591_CTRL_ALS_INTEGRATION_600MS: 318 return 0; 319 default: 320 return -EINVAL; 321 } 322 } 323 324 static int tsl2591_als_time_to_fval(const u32 als_integration_time) 325 { 326 int i; 327 328 for (i = 0; i < ARRAY_SIZE(tsl2591_int_time_available); i++) { 329 if (als_integration_time == tsl2591_int_time_available[i]) 330 return TSL2591_SEC_TO_FVAL(als_integration_time); 331 } 332 333 return -EINVAL; 334 } 335 336 static int tsl2591_compatible_gain(struct tsl2591_chip *chip, const u8 als_gain) 337 { 338 switch (als_gain) { 339 case TSL2591_CTRL_ALS_LOW_GAIN: 340 case TSL2591_CTRL_ALS_MED_GAIN: 341 case TSL2591_CTRL_ALS_HIGH_GAIN: 342 case TSL2591_CTRL_ALS_MAX_GAIN: 343 return 0; 344 default: 345 return -EINVAL; 346 } 347 } 348 349 static int tsl2591_compatible_als_persist_cycle(struct tsl2591_chip *chip, 350 const u32 als_persist) 351 { 352 switch (als_persist) { 353 case TSL2591_PRST_ALS_INT_CYCLE_ANY: 354 case TSL2591_PRST_ALS_INT_CYCLE_2: 355 case TSL2591_PRST_ALS_INT_CYCLE_3: 356 case TSL2591_PRST_ALS_INT_CYCLE_5: 357 case TSL2591_PRST_ALS_INT_CYCLE_10: 358 case TSL2591_PRST_ALS_INT_CYCLE_15: 359 case TSL2591_PRST_ALS_INT_CYCLE_20: 360 case TSL2591_PRST_ALS_INT_CYCLE_25: 361 case TSL2591_PRST_ALS_INT_CYCLE_30: 362 case TSL2591_PRST_ALS_INT_CYCLE_35: 363 case TSL2591_PRST_ALS_INT_CYCLE_40: 364 case TSL2591_PRST_ALS_INT_CYCLE_45: 365 case TSL2591_PRST_ALS_INT_CYCLE_50: 366 case TSL2591_PRST_ALS_INT_CYCLE_55: 367 case TSL2591_PRST_ALS_INT_CYCLE_60: 368 return 0; 369 default: 370 return -EINVAL; 371 } 372 } 373 374 static int tsl2591_check_als_valid(struct i2c_client *client) 375 { 376 int ret; 377 378 ret = i2c_smbus_read_byte_data(client, TSL2591_CMD_NOP | TSL2591_STATUS); 379 if (ret < 0) { 380 dev_err(&client->dev, "Failed to read register\n"); 381 return -EINVAL; 382 } 383 384 return FIELD_GET(TSL2591_STS_ALS_VALID_MASK, ret); 385 } 386 387 static int tsl2591_wait_adc_complete(struct tsl2591_chip *chip) 388 { 389 struct tsl2591_als_settings settings = chip->als_settings; 390 struct i2c_client *client = chip->client; 391 int delay; 392 int val; 393 int ret; 394 395 delay = TSL2591_FVAL_TO_MSEC(settings.als_int_time); 396 if (!delay) 397 return -EINVAL; 398 399 /* 400 * Sleep for ALS integration time to allow enough time or an ADC read 401 * cycle to complete. Check status after delay for ALS valid. 402 */ 403 msleep(delay); 404 405 /* Check for status ALS valid flag for up to 100ms */ 406 ret = readx_poll_timeout(tsl2591_check_als_valid, client, 407 val, val == TSL2591_STS_VAL_HIGH_MASK, 408 TSL2591_DELAY_PERIOD_US, 409 TSL2591_DELAY_PERIOD_US * TSL2591_ALS_STS_VALID_COUNT); 410 if (ret) 411 dev_err(&client->dev, "Timed out waiting for valid ALS data\n"); 412 413 return ret; 414 } 415 416 /* 417 * tsl2591_read_channel_data - Reads raw channel data and calculates lux 418 * 419 * Formula for lux calculation; 420 * Derived from Adafruit's TSL2591 library 421 * Link: https://github.com/adafruit/Adafruit_TSL2591_Library 422 * Counts Per Lux (CPL) = (ATIME_ms * AGAIN) / LUX DF 423 * lux = ((C0DATA - C1DATA) * (1 - (C1DATA / C0DATA))) / CPL 424 * 425 * Scale values to get more representative value of lux i.e. 426 * lux = ((C0DATA - C1DATA) * (1000 - ((C1DATA * 1000) / C0DATA))) / CPL 427 * 428 * Channel 0 = IR + Visible 429 * Channel 1 = IR only 430 */ 431 static int tsl2591_read_channel_data(struct iio_dev *indio_dev, 432 struct iio_chan_spec const *chan, 433 int *val, int *val2) 434 { 435 struct tsl2591_chip *chip = iio_priv(indio_dev); 436 struct tsl2591_als_settings *settings = &chip->als_settings; 437 struct i2c_client *client = chip->client; 438 u8 als_data[TSL2591_NUM_DATA_REGISTERS]; 439 int counts_per_lux, int_time_fval, gain_multi, lux; 440 u16 als_ch0, als_ch1; 441 int ret; 442 443 ret = tsl2591_wait_adc_complete(chip); 444 if (ret < 0) { 445 dev_err(&client->dev, "No data available. Err: %d\n", ret); 446 return ret; 447 } 448 449 ret = i2c_smbus_read_i2c_block_data(client, 450 TSL2591_CMD_NOP | TSL2591_C0_DATAL, 451 sizeof(als_data), als_data); 452 if (ret < 0) { 453 dev_err(&client->dev, "Failed to read data bytes"); 454 return ret; 455 } 456 457 als_ch0 = get_unaligned_le16(&als_data[0]); 458 als_ch1 = get_unaligned_le16(&als_data[2]); 459 460 switch (chan->type) { 461 case IIO_INTENSITY: 462 if (chan->channel2 == IIO_MOD_LIGHT_BOTH) 463 *val = als_ch0; 464 else if (chan->channel2 == IIO_MOD_LIGHT_IR) 465 *val = als_ch1; 466 else 467 return -EINVAL; 468 break; 469 case IIO_LIGHT: 470 gain_multi = tsl2591_gain_to_multiplier(settings->als_gain); 471 if (gain_multi < 0) { 472 dev_err(&client->dev, "Invalid multiplier"); 473 return gain_multi; 474 } 475 476 int_time_fval = TSL2591_FVAL_TO_MSEC(settings->als_int_time); 477 /* Calculate counts per lux value */ 478 counts_per_lux = (int_time_fval * gain_multi) / TSL2591_LUX_COEFFICIENT; 479 480 dev_dbg(&client->dev, "Counts Per Lux: %d\n", counts_per_lux); 481 482 /* Calculate lux value */ 483 lux = ((als_ch0 - als_ch1) * 484 (1000 - ((als_ch1 * 1000) / als_ch0))) / counts_per_lux; 485 486 dev_dbg(&client->dev, "Raw lux calculation: %d\n", lux); 487 488 /* Divide by 1000 to get real lux value before scaling */ 489 *val = lux / 1000; 490 491 /* Get the decimal part of lux reading */ 492 *val2 = (lux - (*val * 1000)) * 1000; 493 494 break; 495 default: 496 return -EINVAL; 497 } 498 499 return 0; 500 } 501 502 static int tsl2591_set_als_gain_int_time(struct tsl2591_chip *chip) 503 { 504 struct tsl2591_als_settings als_settings = chip->als_settings; 505 struct i2c_client *client = chip->client; 506 int ret; 507 508 ret = i2c_smbus_write_byte_data(client, 509 TSL2591_CMD_NOP | TSL2591_CONTROL, 510 als_settings.als_int_time | als_settings.als_gain); 511 if (ret) 512 dev_err(&client->dev, "Failed to set als gain & int time\n"); 513 514 return ret; 515 } 516 517 static int tsl2591_set_als_lower_threshold(struct tsl2591_chip *chip, 518 u16 als_lower_threshold) 519 { 520 struct tsl2591_als_settings als_settings = chip->als_settings; 521 struct i2c_client *client = chip->client; 522 u16 als_upper_threshold; 523 u8 als_lower_l; 524 u8 als_lower_h; 525 int ret; 526 527 chip->als_settings.als_lower_thresh = als_lower_threshold; 528 529 /* 530 * Lower threshold should not be greater or equal to upper. 531 * If this is the case, then assert upper threshold to new lower 532 * threshold + 1 to avoid ordering issues when setting thresholds. 533 */ 534 if (als_lower_threshold >= als_settings.als_upper_thresh) { 535 als_upper_threshold = als_lower_threshold + 1; 536 tsl2591_set_als_upper_threshold(chip, als_upper_threshold); 537 } 538 539 als_lower_l = als_lower_threshold; 540 als_lower_h = als_lower_threshold >> 8; 541 542 ret = i2c_smbus_write_byte_data(client, 543 TSL2591_CMD_NOP | TSL2591_AILTL, 544 als_lower_l); 545 if (ret) { 546 dev_err(&client->dev, "Failed to set als lower threshold\n"); 547 return ret; 548 } 549 550 ret = i2c_smbus_write_byte_data(client, 551 TSL2591_CMD_NOP | TSL2591_AILTH, 552 als_lower_h); 553 if (ret) { 554 dev_err(&client->dev, "Failed to set als lower threshold\n"); 555 return ret; 556 } 557 558 return 0; 559 } 560 561 static int tsl2591_set_als_upper_threshold(struct tsl2591_chip *chip, 562 u16 als_upper_threshold) 563 { 564 struct tsl2591_als_settings als_settings = chip->als_settings; 565 struct i2c_client *client = chip->client; 566 u16 als_lower_threshold; 567 u8 als_upper_l; 568 u8 als_upper_h; 569 int ret; 570 571 if (als_upper_threshold > TSL2591_ALS_MAX_VALUE) 572 return -EINVAL; 573 574 chip->als_settings.als_upper_thresh = als_upper_threshold; 575 576 /* 577 * Upper threshold should not be less than lower. If this 578 * is the case, then assert lower threshold to new upper 579 * threshold - 1 to avoid ordering issues when setting thresholds. 580 */ 581 if (als_upper_threshold < als_settings.als_lower_thresh) { 582 als_lower_threshold = als_upper_threshold - 1; 583 tsl2591_set_als_lower_threshold(chip, als_lower_threshold); 584 } 585 586 als_upper_l = als_upper_threshold; 587 als_upper_h = als_upper_threshold >> 8; 588 589 ret = i2c_smbus_write_byte_data(client, 590 TSL2591_CMD_NOP | TSL2591_AIHTL, 591 als_upper_l); 592 if (ret) { 593 dev_err(&client->dev, "Failed to set als upper threshold\n"); 594 return ret; 595 } 596 597 ret = i2c_smbus_write_byte_data(client, 598 TSL2591_CMD_NOP | TSL2591_AIHTH, 599 als_upper_h); 600 if (ret) { 601 dev_err(&client->dev, "Failed to set als upper threshold\n"); 602 return ret; 603 } 604 605 return 0; 606 } 607 608 static int tsl2591_set_als_persist_cycle(struct tsl2591_chip *chip, 609 u8 als_persist) 610 { 611 struct i2c_client *client = chip->client; 612 int ret; 613 614 ret = i2c_smbus_write_byte_data(client, 615 TSL2591_CMD_NOP | TSL2591_PERSIST, 616 als_persist); 617 if (ret) 618 dev_err(&client->dev, "Failed to set als persist cycle\n"); 619 620 chip->als_settings.als_persist = als_persist; 621 622 return ret; 623 } 624 625 static int tsl2591_set_power_state(struct tsl2591_chip *chip, u8 state) 626 { 627 struct i2c_client *client = chip->client; 628 int ret; 629 630 ret = i2c_smbus_write_byte_data(client, 631 TSL2591_CMD_NOP | TSL2591_ENABLE, 632 state); 633 if (ret) 634 dev_err(&client->dev, 635 "Failed to set the power state to %#04x\n", state); 636 637 return ret; 638 } 639 640 static ssize_t tsl2591_in_illuminance_period_available_show(struct device *dev, 641 struct device_attribute *attr, 642 char *buf) 643 { 644 struct iio_dev *indio_dev = dev_to_iio_dev(dev); 645 struct tsl2591_chip *chip = iio_priv(indio_dev); 646 647 return sysfs_emit(buf, "%s\n", 648 tsl2591_als_period_list[chip->als_settings.als_int_time]); 649 } 650 651 static IIO_DEVICE_ATTR_RO(tsl2591_in_illuminance_period_available, 0); 652 653 static struct attribute *tsl2591_event_attrs_ctrl[] = { 654 &iio_dev_attr_tsl2591_in_illuminance_period_available.dev_attr.attr, 655 NULL 656 }; 657 658 static const struct attribute_group tsl2591_event_attribute_group = { 659 .attrs = tsl2591_event_attrs_ctrl, 660 }; 661 662 static const struct iio_event_spec tsl2591_events[] = { 663 { 664 .type = IIO_EV_TYPE_THRESH, 665 .dir = IIO_EV_DIR_RISING, 666 .mask_separate = BIT(IIO_EV_INFO_VALUE), 667 }, { 668 .type = IIO_EV_TYPE_THRESH, 669 .dir = IIO_EV_DIR_FALLING, 670 .mask_separate = BIT(IIO_EV_INFO_VALUE), 671 }, { 672 .type = IIO_EV_TYPE_THRESH, 673 .dir = IIO_EV_DIR_EITHER, 674 .mask_separate = BIT(IIO_EV_INFO_PERIOD) | 675 BIT(IIO_EV_INFO_ENABLE), 676 }, 677 }; 678 679 static const struct iio_chan_spec tsl2591_channels[] = { 680 { 681 .type = IIO_INTENSITY, 682 .modified = 1, 683 .channel2 = IIO_MOD_LIGHT_IR, 684 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 685 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) | 686 BIT(IIO_CHAN_INFO_CALIBSCALE), 687 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME) | 688 BIT(IIO_CHAN_INFO_CALIBSCALE) 689 }, 690 { 691 .type = IIO_INTENSITY, 692 .modified = 1, 693 .channel2 = IIO_MOD_LIGHT_BOTH, 694 .event_spec = tsl2591_events, 695 .num_event_specs = ARRAY_SIZE(tsl2591_events), 696 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), 697 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) | 698 BIT(IIO_CHAN_INFO_CALIBSCALE), 699 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME) | 700 BIT(IIO_CHAN_INFO_CALIBSCALE) 701 }, 702 { 703 .type = IIO_LIGHT, 704 .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), 705 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME) | 706 BIT(IIO_CHAN_INFO_CALIBSCALE), 707 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME) | 708 BIT(IIO_CHAN_INFO_CALIBSCALE) 709 }, 710 }; 711 712 static int tsl2591_read_raw(struct iio_dev *indio_dev, 713 struct iio_chan_spec const *chan, 714 int *val, int *val2, long mask) 715 { 716 struct tsl2591_chip *chip = iio_priv(indio_dev); 717 struct i2c_client *client = chip->client; 718 int ret; 719 720 pm_runtime_get_sync(&client->dev); 721 722 mutex_lock(&chip->als_mutex); 723 724 switch (mask) { 725 case IIO_CHAN_INFO_RAW: 726 if (chan->type != IIO_INTENSITY) { 727 ret = -EINVAL; 728 goto err_unlock; 729 } 730 731 ret = tsl2591_read_channel_data(indio_dev, chan, val, val2); 732 if (ret < 0) 733 goto err_unlock; 734 735 ret = IIO_VAL_INT; 736 break; 737 case IIO_CHAN_INFO_PROCESSED: 738 if (chan->type != IIO_LIGHT) { 739 ret = -EINVAL; 740 goto err_unlock; 741 } 742 743 ret = tsl2591_read_channel_data(indio_dev, chan, val, val2); 744 if (ret < 0) 745 break; 746 747 ret = IIO_VAL_INT_PLUS_MICRO; 748 break; 749 case IIO_CHAN_INFO_INT_TIME: 750 if (chan->type != IIO_INTENSITY) { 751 ret = -EINVAL; 752 goto err_unlock; 753 } 754 755 *val = TSL2591_FVAL_TO_SEC(chip->als_settings.als_int_time); 756 ret = IIO_VAL_INT; 757 break; 758 case IIO_CHAN_INFO_CALIBSCALE: 759 if (chan->type != IIO_INTENSITY) { 760 ret = -EINVAL; 761 goto err_unlock; 762 } 763 764 *val = tsl2591_gain_to_multiplier(chip->als_settings.als_gain); 765 ret = IIO_VAL_INT; 766 break; 767 default: 768 ret = -EINVAL; 769 break; 770 } 771 772 err_unlock: 773 mutex_unlock(&chip->als_mutex); 774 775 pm_runtime_mark_last_busy(&client->dev); 776 pm_runtime_put_autosuspend(&client->dev); 777 778 return ret; 779 } 780 781 static int tsl2591_write_raw(struct iio_dev *indio_dev, 782 struct iio_chan_spec const *chan, 783 int val, int val2, long mask) 784 { 785 struct tsl2591_chip *chip = iio_priv(indio_dev); 786 int int_time; 787 int gain; 788 int ret; 789 790 mutex_lock(&chip->als_mutex); 791 792 switch (mask) { 793 case IIO_CHAN_INFO_INT_TIME: 794 int_time = tsl2591_als_time_to_fval(val); 795 if (int_time < 0) { 796 ret = int_time; 797 goto err_unlock; 798 } 799 ret = tsl2591_compatible_int_time(chip, int_time); 800 if (ret < 0) 801 goto err_unlock; 802 803 chip->als_settings.als_int_time = int_time; 804 break; 805 case IIO_CHAN_INFO_CALIBSCALE: 806 gain = tsl2591_multiplier_to_gain(val); 807 if (gain < 0) { 808 ret = gain; 809 goto err_unlock; 810 } 811 ret = tsl2591_compatible_gain(chip, gain); 812 if (ret < 0) 813 goto err_unlock; 814 815 chip->als_settings.als_gain = gain; 816 break; 817 default: 818 ret = -EINVAL; 819 goto err_unlock; 820 } 821 822 ret = tsl2591_set_als_gain_int_time(chip); 823 824 err_unlock: 825 mutex_unlock(&chip->als_mutex); 826 return ret; 827 } 828 829 static int tsl2591_read_available(struct iio_dev *indio_dev, 830 struct iio_chan_spec const *chan, 831 const int **vals, int *type, int *length, 832 long mask) 833 { 834 switch (mask) { 835 case IIO_CHAN_INFO_INT_TIME: 836 *length = ARRAY_SIZE(tsl2591_int_time_available); 837 *vals = tsl2591_int_time_available; 838 *type = IIO_VAL_INT; 839 return IIO_AVAIL_LIST; 840 841 case IIO_CHAN_INFO_CALIBSCALE: 842 *length = ARRAY_SIZE(tsl2591_calibscale_available); 843 *vals = tsl2591_calibscale_available; 844 *type = IIO_VAL_INT; 845 return IIO_AVAIL_LIST; 846 default: 847 return -EINVAL; 848 } 849 } 850 851 static int tsl2591_read_event_value(struct iio_dev *indio_dev, 852 const struct iio_chan_spec *chan, 853 enum iio_event_type type, 854 enum iio_event_direction dir, 855 enum iio_event_info info, int *val, 856 int *val2) 857 { 858 struct tsl2591_chip *chip = iio_priv(indio_dev); 859 struct i2c_client *client = chip->client; 860 int als_persist, int_time, period; 861 int ret; 862 863 mutex_lock(&chip->als_mutex); 864 865 switch (info) { 866 case IIO_EV_INFO_VALUE: 867 switch (dir) { 868 case IIO_EV_DIR_RISING: 869 *val = chip->als_settings.als_upper_thresh; 870 break; 871 case IIO_EV_DIR_FALLING: 872 *val = chip->als_settings.als_lower_thresh; 873 break; 874 default: 875 ret = -EINVAL; 876 goto err_unlock; 877 } 878 ret = IIO_VAL_INT; 879 break; 880 case IIO_EV_INFO_PERIOD: 881 ret = i2c_smbus_read_byte_data(client, 882 TSL2591_CMD_NOP | TSL2591_PERSIST); 883 if (ret <= 0 || ret > TSL2591_PRST_ALS_INT_CYCLE_MAX) 884 goto err_unlock; 885 886 als_persist = tsl2591_persist_cycle_to_lit(ret); 887 int_time = TSL2591_FVAL_TO_MSEC(chip->als_settings.als_int_time); 888 period = als_persist * (int_time * MSEC_PER_SEC); 889 890 *val = period / USEC_PER_SEC; 891 *val2 = period % USEC_PER_SEC; 892 893 ret = IIO_VAL_INT_PLUS_MICRO; 894 break; 895 default: 896 ret = -EINVAL; 897 break; 898 } 899 900 err_unlock: 901 mutex_unlock(&chip->als_mutex); 902 return ret; 903 } 904 905 static int tsl2591_write_event_value(struct iio_dev *indio_dev, 906 const struct iio_chan_spec *chan, 907 enum iio_event_type type, 908 enum iio_event_direction dir, 909 enum iio_event_info info, int val, 910 int val2) 911 { 912 struct tsl2591_chip *chip = iio_priv(indio_dev); 913 int period, int_time, als_persist; 914 int ret; 915 916 if (val < 0 || val2 < 0) 917 return -EINVAL; 918 919 mutex_lock(&chip->als_mutex); 920 921 switch (info) { 922 case IIO_EV_INFO_VALUE: 923 if (val > TSL2591_ALS_MAX_VALUE) { 924 ret = -EINVAL; 925 goto err_unlock; 926 } 927 928 switch (dir) { 929 case IIO_EV_DIR_RISING: 930 ret = tsl2591_set_als_upper_threshold(chip, val); 931 if (ret < 0) 932 goto err_unlock; 933 break; 934 case IIO_EV_DIR_FALLING: 935 ret = tsl2591_set_als_lower_threshold(chip, val); 936 if (ret < 0) 937 goto err_unlock; 938 break; 939 default: 940 ret = -EINVAL; 941 goto err_unlock; 942 } 943 break; 944 case IIO_EV_INFO_PERIOD: 945 int_time = TSL2591_FVAL_TO_MSEC(chip->als_settings.als_int_time); 946 947 period = ((val * MSEC_PER_SEC) + 948 (val2 / MSEC_PER_SEC)) / int_time; 949 950 als_persist = tsl2591_persist_lit_to_cycle(period); 951 if (als_persist < 0) { 952 ret = -EINVAL; 953 goto err_unlock; 954 } 955 956 ret = tsl2591_compatible_als_persist_cycle(chip, als_persist); 957 if (ret < 0) 958 goto err_unlock; 959 960 ret = tsl2591_set_als_persist_cycle(chip, als_persist); 961 if (ret < 0) 962 goto err_unlock; 963 break; 964 default: 965 ret = -EINVAL; 966 break; 967 } 968 969 err_unlock: 970 mutex_unlock(&chip->als_mutex); 971 return ret; 972 } 973 974 static int tsl2591_read_event_config(struct iio_dev *indio_dev, 975 const struct iio_chan_spec *chan, 976 enum iio_event_type type, 977 enum iio_event_direction dir) 978 { 979 struct tsl2591_chip *chip = iio_priv(indio_dev); 980 981 return chip->events_enabled; 982 } 983 984 static int tsl2591_write_event_config(struct iio_dev *indio_dev, 985 const struct iio_chan_spec *chan, 986 enum iio_event_type type, 987 enum iio_event_direction dir, 988 int state) 989 { 990 struct tsl2591_chip *chip = iio_priv(indio_dev); 991 struct i2c_client *client = chip->client; 992 993 if (state && !chip->events_enabled) { 994 chip->events_enabled = true; 995 pm_runtime_get_sync(&client->dev); 996 } else if (!state && chip->events_enabled) { 997 chip->events_enabled = false; 998 pm_runtime_mark_last_busy(&client->dev); 999 pm_runtime_put_autosuspend(&client->dev); 1000 } 1001 1002 return 0; 1003 } 1004 1005 static const struct iio_info tsl2591_info = { 1006 .event_attrs = &tsl2591_event_attribute_group, 1007 .read_raw = tsl2591_read_raw, 1008 .write_raw = tsl2591_write_raw, 1009 .read_avail = tsl2591_read_available, 1010 .read_event_value = tsl2591_read_event_value, 1011 .write_event_value = tsl2591_write_event_value, 1012 .read_event_config = tsl2591_read_event_config, 1013 .write_event_config = tsl2591_write_event_config, 1014 }; 1015 1016 static const struct iio_info tsl2591_info_no_irq = { 1017 .read_raw = tsl2591_read_raw, 1018 .write_raw = tsl2591_write_raw, 1019 .read_avail = tsl2591_read_available, 1020 }; 1021 1022 static int tsl2591_suspend(struct device *dev) 1023 { 1024 struct iio_dev *indio_dev = dev_get_drvdata(dev); 1025 struct tsl2591_chip *chip = iio_priv(indio_dev); 1026 int ret; 1027 1028 mutex_lock(&chip->als_mutex); 1029 ret = tsl2591_set_power_state(chip, TSL2591_PWR_OFF); 1030 mutex_unlock(&chip->als_mutex); 1031 1032 return ret; 1033 } 1034 1035 static int tsl2591_resume(struct device *dev) 1036 { 1037 int power_state = TSL2591_PWR_ON | TSL2591_ENABLE_ALS; 1038 struct iio_dev *indio_dev = dev_get_drvdata(dev); 1039 struct tsl2591_chip *chip = iio_priv(indio_dev); 1040 int ret; 1041 1042 if (chip->events_enabled) 1043 power_state |= TSL2591_ENABLE_ALS_INT; 1044 1045 mutex_lock(&chip->als_mutex); 1046 ret = tsl2591_set_power_state(chip, power_state); 1047 mutex_unlock(&chip->als_mutex); 1048 1049 return ret; 1050 } 1051 1052 static DEFINE_RUNTIME_DEV_PM_OPS(tsl2591_pm_ops, tsl2591_suspend, 1053 tsl2591_resume, NULL); 1054 1055 static irqreturn_t tsl2591_event_handler(int irq, void *private) 1056 { 1057 struct iio_dev *dev_info = private; 1058 struct tsl2591_chip *chip = iio_priv(dev_info); 1059 struct i2c_client *client = chip->client; 1060 1061 if (!chip->events_enabled) 1062 return IRQ_NONE; 1063 1064 iio_push_event(dev_info, 1065 IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0, 1066 IIO_EV_TYPE_THRESH, 1067 IIO_EV_DIR_EITHER), 1068 iio_get_time_ns(dev_info)); 1069 1070 /* Clear ALS irq */ 1071 i2c_smbus_write_byte(client, TSL2591_CMD_SF_CALS_NPI); 1072 1073 return IRQ_HANDLED; 1074 } 1075 1076 static int tsl2591_load_defaults(struct tsl2591_chip *chip) 1077 { 1078 int ret; 1079 1080 chip->als_settings.als_int_time = TSL2591_DEFAULT_ALS_INT_TIME; 1081 chip->als_settings.als_gain = TSL2591_DEFAULT_ALS_GAIN; 1082 chip->als_settings.als_lower_thresh = TSL2591_DEFAULT_ALS_LOWER_THRESH; 1083 chip->als_settings.als_upper_thresh = TSL2591_DEFAULT_ALS_UPPER_THRESH; 1084 1085 ret = tsl2591_set_als_gain_int_time(chip); 1086 if (ret < 0) 1087 return ret; 1088 1089 ret = tsl2591_set_als_persist_cycle(chip, TSL2591_DEFAULT_ALS_PERSIST); 1090 if (ret < 0) 1091 return ret; 1092 1093 ret = tsl2591_set_als_lower_threshold(chip, TSL2591_DEFAULT_ALS_LOWER_THRESH); 1094 if (ret < 0) 1095 return ret; 1096 1097 ret = tsl2591_set_als_upper_threshold(chip, TSL2591_DEFAULT_ALS_UPPER_THRESH); 1098 if (ret < 0) 1099 return ret; 1100 1101 return 0; 1102 } 1103 1104 static void tsl2591_chip_off(void *data) 1105 { 1106 struct iio_dev *indio_dev = data; 1107 struct tsl2591_chip *chip = iio_priv(indio_dev); 1108 struct i2c_client *client = chip->client; 1109 1110 pm_runtime_disable(&client->dev); 1111 pm_runtime_set_suspended(&client->dev); 1112 pm_runtime_put_noidle(&client->dev); 1113 1114 tsl2591_set_power_state(chip, TSL2591_PWR_OFF); 1115 } 1116 1117 static int tsl2591_probe(struct i2c_client *client) 1118 { 1119 struct tsl2591_chip *chip; 1120 struct iio_dev *indio_dev; 1121 int ret; 1122 1123 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { 1124 dev_err(&client->dev, 1125 "I2C smbus byte data functionality is not supported\n"); 1126 return -EOPNOTSUPP; 1127 } 1128 1129 indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*chip)); 1130 if (!indio_dev) 1131 return -ENOMEM; 1132 1133 chip = iio_priv(indio_dev); 1134 chip->client = client; 1135 i2c_set_clientdata(client, indio_dev); 1136 1137 if (client->irq) { 1138 ret = devm_request_threaded_irq(&client->dev, client->irq, 1139 NULL, tsl2591_event_handler, 1140 IRQF_TRIGGER_FALLING | IRQF_ONESHOT, 1141 "tsl2591_irq", indio_dev); 1142 if (ret) { 1143 dev_err_probe(&client->dev, ret, "IRQ request error\n"); 1144 return -EINVAL; 1145 } 1146 indio_dev->info = &tsl2591_info; 1147 } else { 1148 indio_dev->info = &tsl2591_info_no_irq; 1149 } 1150 1151 mutex_init(&chip->als_mutex); 1152 1153 ret = i2c_smbus_read_byte_data(client, 1154 TSL2591_CMD_NOP | TSL2591_DEVICE_ID); 1155 if (ret < 0) { 1156 dev_err(&client->dev, 1157 "Failed to read the device ID register\n"); 1158 return ret; 1159 } 1160 ret = FIELD_GET(TSL2591_DEVICE_ID_MASK, ret); 1161 if (ret != TSL2591_DEVICE_ID_VAL) { 1162 dev_err(&client->dev, "Device ID: %#04x unknown\n", ret); 1163 return -EINVAL; 1164 } 1165 1166 indio_dev->channels = tsl2591_channels; 1167 indio_dev->num_channels = ARRAY_SIZE(tsl2591_channels); 1168 indio_dev->modes = INDIO_DIRECT_MODE; 1169 indio_dev->name = chip->client->name; 1170 chip->events_enabled = false; 1171 1172 pm_runtime_enable(&client->dev); 1173 pm_runtime_set_autosuspend_delay(&client->dev, 1174 TSL2591_POWER_OFF_DELAY_MS); 1175 pm_runtime_use_autosuspend(&client->dev); 1176 1177 /* 1178 * Add chip off to automatically managed path and disable runtime 1179 * power management. This ensures that the chip power management 1180 * is handled correctly on driver remove. tsl2591_chip_off() must be 1181 * added to the managed path after pm runtime is enabled and before 1182 * any error exit paths are met to ensure we're not left in a state 1183 * of pm runtime not being disabled properly. 1184 */ 1185 ret = devm_add_action_or_reset(&client->dev, tsl2591_chip_off, 1186 indio_dev); 1187 if (ret < 0) 1188 return -EINVAL; 1189 1190 ret = tsl2591_load_defaults(chip); 1191 if (ret < 0) { 1192 dev_err(&client->dev, "Failed to load sensor defaults\n"); 1193 return -EINVAL; 1194 } 1195 1196 ret = i2c_smbus_write_byte(client, TSL2591_CMD_SF_CALS_NPI); 1197 if (ret < 0) { 1198 dev_err(&client->dev, "Failed to clear als irq\n"); 1199 return -EINVAL; 1200 } 1201 1202 return devm_iio_device_register(&client->dev, indio_dev); 1203 } 1204 1205 static const struct of_device_id tsl2591_of_match[] = { 1206 { .compatible = "amstaos,tsl2591"}, 1207 {} 1208 }; 1209 MODULE_DEVICE_TABLE(of, tsl2591_of_match); 1210 1211 static struct i2c_driver tsl2591_driver = { 1212 .driver = { 1213 .name = "tsl2591", 1214 .pm = pm_ptr(&tsl2591_pm_ops), 1215 .of_match_table = tsl2591_of_match, 1216 }, 1217 .probe_new = tsl2591_probe 1218 }; 1219 module_i2c_driver(tsl2591_driver); 1220 1221 MODULE_AUTHOR("Joe Sandom <joe.g.sandom@gmail.com>"); 1222 MODULE_DESCRIPTION("TAOS tsl2591 ambient light sensor driver"); 1223 MODULE_LICENSE("GPL"); 1224