1// SPDX-License-Identifier: GPL-2.0-only 2/* 3 * ROHM Colour Sensor driver for 4 * - BU27008 RGBC sensor 5 * - BU27010 RGBC + Flickering sensor 6 * 7 * Copyright (c) 2023, ROHM Semiconductor. 8 */ 9 10#include <linux/bitfield.h> 11#include <linux/bitops.h> 12#include <linux/device.h> 13#include <linux/i2c.h> 14#include <linux/interrupt.h> 15#include <linux/module.h> 16#include <linux/property.h> 17#include <linux/regmap.h> 18#include <linux/regulator/consumer.h> 19#include <linux/units.h> 20 21#include <linux/iio/iio.h> 22#include <linux/iio/iio-gts-helper.h> 23#include <linux/iio/trigger.h> 24#include <linux/iio/trigger_consumer.h> 25#include <linux/iio/triggered_buffer.h> 26 27/* 28 * A word about register address and mask definitions. 29 * 30 * At a quick glance to the data-sheet register tables, the BU27010 has all the 31 * registers that the BU27008 has. On top of that the BU27010 adds couple of new 32 * ones. 33 * 34 * So, all definitions BU27008_REG_* are there also for BU27010 but none of the 35 * BU27010_REG_* are present on BU27008. This makes sense as BU27010 just adds 36 * some features (Flicker FIFO, more power control) on top of the BU27008. 37 * 38 * Unfortunately, some of the wheel has been re-invented. Even though the names 39 * of the registers have stayed the same, pretty much all of the functionality 40 * provided by the registers has changed place. Contents of all MODE_CONTROL 41 * registers on BU27008 and BU27010 are different. 42 * 43 * Chip-specific mapping from register addresses/bits to functionality is done 44 * in bu27_chip_data structures. 45 */ 46#define BU27008_REG_SYSTEM_CONTROL 0x40 47#define BU27008_MASK_SW_RESET BIT(7) 48#define BU27008_MASK_PART_ID GENMASK(5, 0) 49#define BU27008_ID 0x1a 50#define BU27008_REG_MODE_CONTROL1 0x41 51#define BU27008_MASK_MEAS_MODE GENMASK(2, 0) 52#define BU27008_MASK_CHAN_SEL GENMASK(3, 2) 53 54#define BU27008_REG_MODE_CONTROL2 0x42 55#define BU27008_MASK_RGBC_GAIN GENMASK(7, 3) 56#define BU27008_MASK_IR_GAIN_LO GENMASK(2, 0) 57#define BU27008_SHIFT_IR_GAIN 3 58 59#define BU27008_REG_MODE_CONTROL3 0x43 60#define BU27008_MASK_VALID BIT(7) 61#define BU27008_MASK_INT_EN BIT(1) 62#define BU27008_INT_EN BU27008_MASK_INT_EN 63#define BU27008_INT_DIS 0 64#define BU27008_MASK_MEAS_EN BIT(0) 65#define BU27008_MEAS_EN BIT(0) 66#define BU27008_MEAS_DIS 0 67 68#define BU27008_REG_DATA0_LO 0x50 69#define BU27008_REG_DATA1_LO 0x52 70#define BU27008_REG_DATA2_LO 0x54 71#define BU27008_REG_DATA3_LO 0x56 72#define BU27008_REG_DATA3_HI 0x57 73#define BU27008_REG_MANUFACTURER_ID 0x92 74#define BU27008_REG_MAX BU27008_REG_MANUFACTURER_ID 75 76/* BU27010 specific definitions */ 77 78#define BU27010_MASK_SW_RESET BIT(7) 79#define BU27010_ID 0x1b 80#define BU27010_REG_POWER 0x3e 81#define BU27010_MASK_POWER BIT(0) 82 83#define BU27010_REG_RESET 0x3f 84#define BU27010_MASK_RESET BIT(0) 85#define BU27010_RESET_RELEASE BU27010_MASK_RESET 86 87#define BU27010_MASK_MEAS_EN BIT(1) 88 89#define BU27010_MASK_CHAN_SEL GENMASK(7, 6) 90#define BU27010_MASK_MEAS_MODE GENMASK(5, 4) 91#define BU27010_MASK_RGBC_GAIN GENMASK(3, 0) 92 93#define BU27010_MASK_DATA3_GAIN GENMASK(7, 6) 94#define BU27010_MASK_DATA2_GAIN GENMASK(5, 4) 95#define BU27010_MASK_DATA1_GAIN GENMASK(3, 2) 96#define BU27010_MASK_DATA0_GAIN GENMASK(1, 0) 97 98#define BU27010_MASK_FLC_MODE BIT(7) 99#define BU27010_MASK_FLC_GAIN GENMASK(4, 0) 100 101#define BU27010_REG_MODE_CONTROL4 0x44 102/* If flicker is ever to be supported the IRQ must be handled as a field */ 103#define BU27010_IRQ_DIS_ALL GENMASK(1, 0) 104#define BU27010_DRDY_EN BIT(0) 105#define BU27010_MASK_INT_SEL GENMASK(1, 0) 106 107#define BU27010_REG_MODE_CONTROL5 0x45 108#define BU27010_MASK_RGB_VALID BIT(7) 109#define BU27010_MASK_FLC_VALID BIT(6) 110#define BU27010_MASK_WAIT_EN BIT(3) 111#define BU27010_MASK_FIFO_EN BIT(2) 112#define BU27010_MASK_RGB_EN BIT(1) 113#define BU27010_MASK_FLC_EN BIT(0) 114 115#define BU27010_REG_DATA_FLICKER_LO 0x56 116#define BU27010_MASK_DATA_FLICKER_HI GENMASK(2, 0) 117#define BU27010_REG_FLICKER_COUNT 0x5a 118#define BU27010_REG_FIFO_LEVEL_LO 0x5b 119#define BU27010_MASK_FIFO_LEVEL_HI BIT(0) 120#define BU27010_REG_FIFO_DATA_LO 0x5d 121#define BU27010_REG_FIFO_DATA_HI 0x5e 122#define BU27010_MASK_FIFO_DATA_HI GENMASK(2, 0) 123#define BU27010_REG_MANUFACTURER_ID 0x92 124#define BU27010_REG_MAX BU27010_REG_MANUFACTURER_ID 125 126/** 127 * enum bu27008_chan_type - BU27008 channel types 128 * @BU27008_RED: Red channel. Always via data0. 129 * @BU27008_GREEN: Green channel. Always via data1. 130 * @BU27008_BLUE: Blue channel. Via data2 (when used). 131 * @BU27008_CLEAR: Clear channel. Via data2 or data3 (when used). 132 * @BU27008_IR: IR channel. Via data3 (when used). 133 * @BU27008_NUM_CHANS: Number of channel types. 134 */ 135enum bu27008_chan_type { 136 BU27008_RED, 137 BU27008_GREEN, 138 BU27008_BLUE, 139 BU27008_CLEAR, 140 BU27008_IR, 141 BU27008_NUM_CHANS 142}; 143 144/** 145 * enum bu27008_chan - BU27008 physical data channel 146 * @BU27008_DATA0: Always red. 147 * @BU27008_DATA1: Always green. 148 * @BU27008_DATA2: Blue or clear. 149 * @BU27008_DATA3: IR or clear. 150 * @BU27008_NUM_HW_CHANS: Number of physical channels 151 */ 152enum bu27008_chan { 153 BU27008_DATA0, 154 BU27008_DATA1, 155 BU27008_DATA2, 156 BU27008_DATA3, 157 BU27008_NUM_HW_CHANS 158}; 159 160/* We can always measure red and green at same time */ 161#define ALWAYS_SCANNABLE (BIT(BU27008_RED) | BIT(BU27008_GREEN)) 162 163/* We use these data channel configs. Ensure scan_masks below follow them too */ 164#define BU27008_BLUE2_CLEAR3 0x0 /* buffer is R, G, B, C */ 165#define BU27008_CLEAR2_IR3 0x1 /* buffer is R, G, C, IR */ 166#define BU27008_BLUE2_IR3 0x2 /* buffer is R, G, B, IR */ 167 168static const unsigned long bu27008_scan_masks[] = { 169 /* buffer is R, G, B, C */ 170 ALWAYS_SCANNABLE | BIT(BU27008_BLUE) | BIT(BU27008_CLEAR), 171 /* buffer is R, G, C, IR */ 172 ALWAYS_SCANNABLE | BIT(BU27008_CLEAR) | BIT(BU27008_IR), 173 /* buffer is R, G, B, IR */ 174 ALWAYS_SCANNABLE | BIT(BU27008_BLUE) | BIT(BU27008_IR), 175 0 176}; 177 178/* 179 * Available scales with gain 1x - 1024x, timings 55, 100, 200, 400 mS 180 * Time impacts to gain: 1x, 2x, 4x, 8x. 181 * 182 * => Max total gain is HWGAIN * gain by integration time (8 * 1024) = 8192 183 * 184 * Max amplification is (HWGAIN * MAX integration-time multiplier) 1024 * 8 185 * = 8192. With NANO scale we get rid of accuracy loss when we start with the 186 * scale 16.0 for HWGAIN1, INT-TIME 55 mS. This way the nano scale for MAX 187 * total gain 8192 will be 1953125 188 */ 189#define BU27008_SCALE_1X 16 190 191/* 192 * On BU27010 available scales with gain 1x - 4096x, 193 * timings 55, 100, 200, 400 mS. Time impacts to gain: 1x, 2x, 4x, 8x. 194 * 195 * => Max total gain is HWGAIN * gain by integration time (8 * 4096) 196 * 197 * Using NANO precision for scale we must use scale 64x corresponding gain 1x 198 * to avoid precision loss. 199 */ 200#define BU27010_SCALE_1X 64 201 202/* See the data sheet for the "Gain Setting" table */ 203#define BU27008_GSEL_1X 0x00 204#define BU27008_GSEL_4X 0x08 205#define BU27008_GSEL_8X 0x09 206#define BU27008_GSEL_16X 0x0a 207#define BU27008_GSEL_32X 0x0b 208#define BU27008_GSEL_64X 0x0c 209#define BU27008_GSEL_256X 0x18 210#define BU27008_GSEL_512X 0x19 211#define BU27008_GSEL_1024X 0x1a 212 213static const struct iio_gain_sel_pair bu27008_gains[] = { 214 GAIN_SCALE_GAIN(1, BU27008_GSEL_1X), 215 GAIN_SCALE_GAIN(4, BU27008_GSEL_4X), 216 GAIN_SCALE_GAIN(8, BU27008_GSEL_8X), 217 GAIN_SCALE_GAIN(16, BU27008_GSEL_16X), 218 GAIN_SCALE_GAIN(32, BU27008_GSEL_32X), 219 GAIN_SCALE_GAIN(64, BU27008_GSEL_64X), 220 GAIN_SCALE_GAIN(256, BU27008_GSEL_256X), 221 GAIN_SCALE_GAIN(512, BU27008_GSEL_512X), 222 GAIN_SCALE_GAIN(1024, BU27008_GSEL_1024X), 223}; 224 225static const struct iio_gain_sel_pair bu27008_gains_ir[] = { 226 GAIN_SCALE_GAIN(2, BU27008_GSEL_1X), 227 GAIN_SCALE_GAIN(4, BU27008_GSEL_4X), 228 GAIN_SCALE_GAIN(8, BU27008_GSEL_8X), 229 GAIN_SCALE_GAIN(16, BU27008_GSEL_16X), 230 GAIN_SCALE_GAIN(32, BU27008_GSEL_32X), 231 GAIN_SCALE_GAIN(64, BU27008_GSEL_64X), 232 GAIN_SCALE_GAIN(256, BU27008_GSEL_256X), 233 GAIN_SCALE_GAIN(512, BU27008_GSEL_512X), 234 GAIN_SCALE_GAIN(1024, BU27008_GSEL_1024X), 235}; 236 237#define BU27010_GSEL_1X 0x00 /* 000000 */ 238#define BU27010_GSEL_4X 0x08 /* 001000 */ 239#define BU27010_GSEL_16X 0x09 /* 001001 */ 240#define BU27010_GSEL_64X 0x0e /* 001110 */ 241#define BU27010_GSEL_256X 0x1e /* 011110 */ 242#define BU27010_GSEL_1024X 0x2e /* 101110 */ 243#define BU27010_GSEL_4096X 0x3f /* 111111 */ 244 245static const struct iio_gain_sel_pair bu27010_gains[] = { 246 GAIN_SCALE_GAIN(1, BU27010_GSEL_1X), 247 GAIN_SCALE_GAIN(4, BU27010_GSEL_4X), 248 GAIN_SCALE_GAIN(16, BU27010_GSEL_16X), 249 GAIN_SCALE_GAIN(64, BU27010_GSEL_64X), 250 GAIN_SCALE_GAIN(256, BU27010_GSEL_256X), 251 GAIN_SCALE_GAIN(1024, BU27010_GSEL_1024X), 252 GAIN_SCALE_GAIN(4096, BU27010_GSEL_4096X), 253}; 254 255static const struct iio_gain_sel_pair bu27010_gains_ir[] = { 256 GAIN_SCALE_GAIN(2, BU27010_GSEL_1X), 257 GAIN_SCALE_GAIN(4, BU27010_GSEL_4X), 258 GAIN_SCALE_GAIN(16, BU27010_GSEL_16X), 259 GAIN_SCALE_GAIN(64, BU27010_GSEL_64X), 260 GAIN_SCALE_GAIN(256, BU27010_GSEL_256X), 261 GAIN_SCALE_GAIN(1024, BU27010_GSEL_1024X), 262 GAIN_SCALE_GAIN(4096, BU27010_GSEL_4096X), 263}; 264 265#define BU27008_MEAS_MODE_100MS 0x00 266#define BU27008_MEAS_MODE_55MS 0x01 267#define BU27008_MEAS_MODE_200MS 0x02 268#define BU27008_MEAS_MODE_400MS 0x04 269 270#define BU27010_MEAS_MODE_100MS 0x00 271#define BU27010_MEAS_MODE_55MS 0x03 272#define BU27010_MEAS_MODE_200MS 0x01 273#define BU27010_MEAS_MODE_400MS 0x02 274 275#define BU27008_MEAS_TIME_MAX_MS 400 276 277static const struct iio_itime_sel_mul bu27008_itimes[] = { 278 GAIN_SCALE_ITIME_US(400000, BU27008_MEAS_MODE_400MS, 8), 279 GAIN_SCALE_ITIME_US(200000, BU27008_MEAS_MODE_200MS, 4), 280 GAIN_SCALE_ITIME_US(100000, BU27008_MEAS_MODE_100MS, 2), 281 GAIN_SCALE_ITIME_US(55000, BU27008_MEAS_MODE_55MS, 1), 282}; 283 284static const struct iio_itime_sel_mul bu27010_itimes[] = { 285 GAIN_SCALE_ITIME_US(400000, BU27010_MEAS_MODE_400MS, 8), 286 GAIN_SCALE_ITIME_US(200000, BU27010_MEAS_MODE_200MS, 4), 287 GAIN_SCALE_ITIME_US(100000, BU27010_MEAS_MODE_100MS, 2), 288 GAIN_SCALE_ITIME_US(55000, BU27010_MEAS_MODE_55MS, 1), 289}; 290 291/* 292 * All the RGBC channels share the same gain. 293 * IR gain can be fine-tuned from the gain set for the RGBC by 2 bit, but this 294 * would yield quite complex gain setting. Especially since not all bit 295 * compinations are supported. And in any case setting GAIN for RGBC will 296 * always also change the IR-gain. 297 * 298 * On top of this, the selector '0' which corresponds to hw-gain 1X on RGBC, 299 * corresponds to gain 2X on IR. Rest of the selctors correspond to same gains 300 * though. This, however, makes it not possible to use shared gain for all 301 * RGBC and IR settings even though they are all changed at the one go. 302 */ 303#define BU27008_CHAN(color, data, separate_avail) \ 304{ \ 305 .type = IIO_INTENSITY, \ 306 .modified = 1, \ 307 .channel2 = IIO_MOD_LIGHT_##color, \ 308 .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ 309 BIT(IIO_CHAN_INFO_SCALE), \ 310 .info_mask_separate_available = (separate_avail), \ 311 .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_INT_TIME), \ 312 .info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_INT_TIME), \ 313 .address = BU27008_REG_##data##_LO, \ 314 .scan_index = BU27008_##color, \ 315 .scan_type = { \ 316 .sign = 'u', \ 317 .realbits = 16, \ 318 .storagebits = 16, \ 319 .endianness = IIO_LE, \ 320 }, \ 321} 322 323/* For raw reads we always configure DATA3 for CLEAR */ 324static const struct iio_chan_spec bu27008_channels[] = { 325 BU27008_CHAN(RED, DATA0, BIT(IIO_CHAN_INFO_SCALE)), 326 BU27008_CHAN(GREEN, DATA1, BIT(IIO_CHAN_INFO_SCALE)), 327 BU27008_CHAN(BLUE, DATA2, BIT(IIO_CHAN_INFO_SCALE)), 328 BU27008_CHAN(CLEAR, DATA2, BIT(IIO_CHAN_INFO_SCALE)), 329 /* 330 * We don't allow setting scale for IR (because of shared gain bits). 331 * Hence we don't advertise available ones either. 332 */ 333 BU27008_CHAN(IR, DATA3, 0), 334 IIO_CHAN_SOFT_TIMESTAMP(BU27008_NUM_CHANS), 335}; 336 337struct bu27008_data; 338 339struct bu27_chip_data { 340 const char *name; 341 int (*chip_init)(struct bu27008_data *data); 342 int (*get_gain_sel)(struct bu27008_data *data, int *sel); 343 int (*write_gain_sel)(struct bu27008_data *data, int sel); 344 const struct regmap_config *regmap_cfg; 345 const struct iio_gain_sel_pair *gains; 346 const struct iio_gain_sel_pair *gains_ir; 347 const struct iio_itime_sel_mul *itimes; 348 int num_gains; 349 int num_gains_ir; 350 int num_itimes; 351 int scale1x; 352 353 int drdy_en_reg; 354 int drdy_en_mask; 355 int meas_en_reg; 356 int meas_en_mask; 357 int valid_reg; 358 int chan_sel_reg; 359 int chan_sel_mask; 360 int int_time_mask; 361 u8 part_id; 362}; 363 364struct bu27008_data { 365 const struct bu27_chip_data *cd; 366 struct regmap *regmap; 367 struct iio_trigger *trig; 368 struct device *dev; 369 struct iio_gts gts; 370 struct iio_gts gts_ir; 371 int irq; 372 373 /* 374 * Prevent changing gain/time config when scale is read/written. 375 * Similarly, protect the integration_time read/change sequence. 376 * Prevent changing gain/time when data is read. 377 */ 378 struct mutex mutex; 379}; 380 381static const struct regmap_range bu27008_volatile_ranges[] = { 382 { 383 .range_min = BU27008_REG_SYSTEM_CONTROL, /* SWRESET */ 384 .range_max = BU27008_REG_SYSTEM_CONTROL, 385 }, { 386 .range_min = BU27008_REG_MODE_CONTROL3, /* VALID */ 387 .range_max = BU27008_REG_MODE_CONTROL3, 388 }, { 389 .range_min = BU27008_REG_DATA0_LO, /* DATA */ 390 .range_max = BU27008_REG_DATA3_HI, 391 }, 392}; 393 394static const struct regmap_range bu27010_volatile_ranges[] = { 395 { 396 .range_min = BU27010_REG_RESET, /* RSTB */ 397 .range_max = BU27008_REG_SYSTEM_CONTROL, /* RESET */ 398 }, { 399 .range_min = BU27010_REG_MODE_CONTROL5, /* VALID bits */ 400 .range_max = BU27010_REG_MODE_CONTROL5, 401 }, { 402 .range_min = BU27008_REG_DATA0_LO, 403 .range_max = BU27010_REG_FIFO_DATA_HI, 404 }, 405}; 406 407static const struct regmap_access_table bu27008_volatile_regs = { 408 .yes_ranges = &bu27008_volatile_ranges[0], 409 .n_yes_ranges = ARRAY_SIZE(bu27008_volatile_ranges), 410}; 411 412static const struct regmap_access_table bu27010_volatile_regs = { 413 .yes_ranges = &bu27010_volatile_ranges[0], 414 .n_yes_ranges = ARRAY_SIZE(bu27010_volatile_ranges), 415}; 416 417static const struct regmap_range bu27008_read_only_ranges[] = { 418 { 419 .range_min = BU27008_REG_DATA0_LO, 420 .range_max = BU27008_REG_DATA3_HI, 421 }, { 422 .range_min = BU27008_REG_MANUFACTURER_ID, 423 .range_max = BU27008_REG_MANUFACTURER_ID, 424 }, 425}; 426 427static const struct regmap_range bu27010_read_only_ranges[] = { 428 { 429 .range_min = BU27008_REG_DATA0_LO, 430 .range_max = BU27010_REG_FIFO_DATA_HI, 431 }, { 432 .range_min = BU27010_REG_MANUFACTURER_ID, 433 .range_max = BU27010_REG_MANUFACTURER_ID, 434 } 435}; 436 437static const struct regmap_access_table bu27008_ro_regs = { 438 .no_ranges = &bu27008_read_only_ranges[0], 439 .n_no_ranges = ARRAY_SIZE(bu27008_read_only_ranges), 440}; 441 442static const struct regmap_access_table bu27010_ro_regs = { 443 .no_ranges = &bu27010_read_only_ranges[0], 444 .n_no_ranges = ARRAY_SIZE(bu27010_read_only_ranges), 445}; 446 447static const struct regmap_config bu27008_regmap = { 448 .reg_bits = 8, 449 .val_bits = 8, 450 .max_register = BU27008_REG_MAX, 451 .cache_type = REGCACHE_RBTREE, 452 .volatile_table = &bu27008_volatile_regs, 453 .wr_table = &bu27008_ro_regs, 454 /* 455 * All register writes are serialized by the mutex which protects the 456 * scale setting/getting. This is needed because scale is combined by 457 * gain and integration time settings and we need to ensure those are 458 * not read / written when scale is being computed. 459 * 460 * As a result of this serializing, we don't need regmap locking. Note, 461 * this is not true if we add any configurations which are not 462 * serialized by the mutex and which may need for example a protected 463 * read-modify-write cycle (eg. regmap_update_bits()). Please, revise 464 * this when adding features to the driver. 465 */ 466 .disable_locking = true, 467}; 468 469static const struct regmap_config bu27010_regmap = { 470 .reg_bits = 8, 471 .val_bits = 8, 472 473 .max_register = BU27010_REG_MAX, 474 .cache_type = REGCACHE_RBTREE, 475 .volatile_table = &bu27010_volatile_regs, 476 .wr_table = &bu27010_ro_regs, 477 .disable_locking = true, 478}; 479 480static int bu27008_write_gain_sel(struct bu27008_data *data, int sel) 481{ 482 int regval; 483 484 regval = FIELD_PREP(BU27008_MASK_RGBC_GAIN, sel); 485 486 /* 487 * We do always set also the LOW bits of IR-gain because othervice we 488 * would risk resulting an invalid GAIN register value. 489 * 490 * We could allow setting separate gains for RGBC and IR when the 491 * values were such that HW could support both gain settings. 492 * Eg, when the shared bits were same for both gain values. 493 * 494 * This, however, has a negligible benefit compared to the increased 495 * software complexity when we would need to go through the gains 496 * for both channels separately when the integration time changes. 497 * This would end up with nasty logic for computing gain values for 498 * both channels - and rejecting them if shared bits changed. 499 * 500 * We should then build the logic by guessing what a user prefers. 501 * RGBC or IR gains correctly set while other jumps to odd value? 502 * Maybe look-up a value where both gains are somehow optimized 503 * <what this somehow is, is ATM unknown to us>. Or maybe user would 504 * expect us to reject changes when optimal gains can't be set to both 505 * channels w/given integration time. At best that would result 506 * solution that works well for a very specific subset of 507 * configurations but causes unexpected corner-cases. 508 * 509 * So, we keep it simple. Always set same selector to IR and RGBC. 510 * We disallow setting IR (as I expect that most of the users are 511 * interested in RGBC). This way we can show the user that the scales 512 * for RGBC and IR channels are different (1X Vs 2X with sel 0) while 513 * still keeping the operation deterministic. 514 */ 515 regval |= FIELD_PREP(BU27008_MASK_IR_GAIN_LO, sel); 516 517 return regmap_update_bits(data->regmap, BU27008_REG_MODE_CONTROL2, 518 BU27008_MASK_RGBC_GAIN, regval); 519} 520 521static int bu27010_write_gain_sel(struct bu27008_data *data, int sel) 522{ 523 unsigned int regval; 524 int ret, chan_selector; 525 526 /* 527 * Gain 'selector' is composed of two registers. Selector is 6bit value, 528 * 4 high bits being the RGBC gain fieild in MODE_CONTROL1 register and 529 * two low bits being the channel specific gain in MODE_CONTROL2. 530 * 531 * Let's take the 4 high bits of whole 6 bit selector, and prepare 532 * the MODE_CONTROL1 value (RGBC gain part). 533 */ 534 regval = FIELD_PREP(BU27010_MASK_RGBC_GAIN, (sel >> 2)); 535 536 ret = regmap_update_bits(data->regmap, BU27008_REG_MODE_CONTROL1, 537 BU27010_MASK_RGBC_GAIN, regval); 538 if (ret) 539 return ret; 540 541 /* 542 * Two low two bits of the selector must be written for all 4 543 * channels in the MODE_CONTROL2 register. Copy these two bits for 544 * all channels. 545 */ 546 chan_selector = sel & GENMASK(1, 0); 547 548 regval = FIELD_PREP(BU27010_MASK_DATA0_GAIN, chan_selector); 549 regval |= FIELD_PREP(BU27010_MASK_DATA1_GAIN, chan_selector); 550 regval |= FIELD_PREP(BU27010_MASK_DATA2_GAIN, chan_selector); 551 regval |= FIELD_PREP(BU27010_MASK_DATA3_GAIN, chan_selector); 552 553 return regmap_write(data->regmap, BU27008_REG_MODE_CONTROL2, regval); 554} 555 556static int bu27008_get_gain_sel(struct bu27008_data *data, int *sel) 557{ 558 int ret; 559 560 /* 561 * If we always "lock" the gain selectors for all channels to prevent 562 * unsupported configs, then it does not matter which channel is used 563 * we can just return selector from any of them. 564 * 565 * This, however is not true if we decide to support only 4X and 16X 566 * and then individual gains for channels. Currently this is not the 567 * case. 568 * 569 * If we some day decide to support individual gains, then we need to 570 * have channel information here. 571 */ 572 573 ret = regmap_read(data->regmap, BU27008_REG_MODE_CONTROL2, sel); 574 if (ret) 575 return ret; 576 577 *sel = FIELD_GET(BU27008_MASK_RGBC_GAIN, *sel); 578 579 return 0; 580} 581 582static int bu27010_get_gain_sel(struct bu27008_data *data, int *sel) 583{ 584 int ret, tmp; 585 586 /* 587 * We always "lock" the gain selectors for all channels to prevent 588 * unsupported configs. It does not matter which channel is used 589 * we can just return selector from any of them. 590 * 591 * Read the channel0 gain. 592 */ 593 ret = regmap_read(data->regmap, BU27008_REG_MODE_CONTROL2, sel); 594 if (ret) 595 return ret; 596 597 *sel = FIELD_GET(BU27010_MASK_DATA0_GAIN, *sel); 598 599 /* Read the shared gain */ 600 ret = regmap_read(data->regmap, BU27008_REG_MODE_CONTROL1, &tmp); 601 if (ret) 602 return ret; 603 604 /* 605 * The gain selector is made as a combination of common RGBC gain and 606 * the channel specific gain. The channel specific gain forms the low 607 * bits of selector and RGBC gain is appended right after it. 608 * 609 * Compose the selector from channel0 gain and shared RGBC gain. 610 */ 611 *sel |= FIELD_GET(BU27010_MASK_RGBC_GAIN, tmp) << fls(BU27010_MASK_DATA0_GAIN); 612 613 return ret; 614} 615 616static int bu27008_chip_init(struct bu27008_data *data) 617{ 618 int ret; 619 620 ret = regmap_write_bits(data->regmap, BU27008_REG_SYSTEM_CONTROL, 621 BU27008_MASK_SW_RESET, BU27008_MASK_SW_RESET); 622 if (ret) 623 return dev_err_probe(data->dev, ret, "Sensor reset failed\n"); 624 625 /* 626 * The data-sheet does not tell how long performing the IC reset takes. 627 * However, the data-sheet says the minimum time it takes the IC to be 628 * able to take inputs after power is applied, is 100 uS. I'd assume 629 * > 1 mS is enough. 630 */ 631 msleep(1); 632 633 ret = regmap_reinit_cache(data->regmap, data->cd->regmap_cfg); 634 if (ret) 635 dev_err(data->dev, "Failed to reinit reg cache\n"); 636 637 return ret; 638} 639 640static int bu27010_chip_init(struct bu27008_data *data) 641{ 642 int ret; 643 644 ret = regmap_write_bits(data->regmap, BU27008_REG_SYSTEM_CONTROL, 645 BU27010_MASK_SW_RESET, BU27010_MASK_SW_RESET); 646 if (ret) 647 return dev_err_probe(data->dev, ret, "Sensor reset failed\n"); 648 649 msleep(1); 650 651 /* Power ON*/ 652 ret = regmap_write_bits(data->regmap, BU27010_REG_POWER, 653 BU27010_MASK_POWER, BU27010_MASK_POWER); 654 if (ret) 655 return dev_err_probe(data->dev, ret, "Sensor power-on failed\n"); 656 657 msleep(1); 658 659 /* Release blocks from reset */ 660 ret = regmap_write_bits(data->regmap, BU27010_REG_RESET, 661 BU27010_MASK_RESET, BU27010_RESET_RELEASE); 662 if (ret) 663 return dev_err_probe(data->dev, ret, "Sensor powering failed\n"); 664 665 msleep(1); 666 667 /* 668 * The IRQ enabling on BU27010 is done in a peculiar way. The IRQ 669 * enabling is not a bit mask where individual IRQs could be enabled but 670 * a field which values are: 671 * 00 => IRQs disabled 672 * 01 => Data-ready (RGBC/IR) 673 * 10 => Data-ready (flicker) 674 * 11 => Flicker FIFO 675 * 676 * So, only one IRQ can be enabled at a time and enabling for example 677 * flicker FIFO would automagically disable data-ready IRQ. 678 * 679 * Currently the driver does not support the flicker. Hence, we can 680 * just treat the RGBC data-ready as single bit which can be enabled / 681 * disabled. This works for as long as the second bit in the field 682 * stays zero. Here we ensure it gets zeroed. 683 */ 684 return regmap_clear_bits(data->regmap, BU27010_REG_MODE_CONTROL4, 685 BU27010_IRQ_DIS_ALL); 686} 687 688static const struct bu27_chip_data bu27010_chip = { 689 .name = "bu27010", 690 .chip_init = bu27010_chip_init, 691 .get_gain_sel = bu27010_get_gain_sel, 692 .write_gain_sel = bu27010_write_gain_sel, 693 .regmap_cfg = &bu27010_regmap, 694 .gains = &bu27010_gains[0], 695 .gains_ir = &bu27010_gains_ir[0], 696 .itimes = &bu27010_itimes[0], 697 .num_gains = ARRAY_SIZE(bu27010_gains), 698 .num_gains_ir = ARRAY_SIZE(bu27010_gains_ir), 699 .num_itimes = ARRAY_SIZE(bu27010_itimes), 700 .scale1x = BU27010_SCALE_1X, 701 .drdy_en_reg = BU27010_REG_MODE_CONTROL4, 702 .drdy_en_mask = BU27010_DRDY_EN, 703 .meas_en_reg = BU27010_REG_MODE_CONTROL5, 704 .meas_en_mask = BU27010_MASK_MEAS_EN, 705 .valid_reg = BU27010_REG_MODE_CONTROL5, 706 .chan_sel_reg = BU27008_REG_MODE_CONTROL1, 707 .chan_sel_mask = BU27010_MASK_CHAN_SEL, 708 .int_time_mask = BU27010_MASK_MEAS_MODE, 709 .part_id = BU27010_ID, 710}; 711 712static const struct bu27_chip_data bu27008_chip = { 713 .name = "bu27008", 714 .chip_init = bu27008_chip_init, 715 .get_gain_sel = bu27008_get_gain_sel, 716 .write_gain_sel = bu27008_write_gain_sel, 717 .regmap_cfg = &bu27008_regmap, 718 .gains = &bu27008_gains[0], 719 .gains_ir = &bu27008_gains_ir[0], 720 .itimes = &bu27008_itimes[0], 721 .num_gains = ARRAY_SIZE(bu27008_gains), 722 .num_gains_ir = ARRAY_SIZE(bu27008_gains_ir), 723 .num_itimes = ARRAY_SIZE(bu27008_itimes), 724 .scale1x = BU27008_SCALE_1X, 725 .drdy_en_reg = BU27008_REG_MODE_CONTROL3, 726 .drdy_en_mask = BU27008_MASK_INT_EN, 727 .valid_reg = BU27008_REG_MODE_CONTROL3, 728 .meas_en_reg = BU27008_REG_MODE_CONTROL3, 729 .meas_en_mask = BU27008_MASK_MEAS_EN, 730 .chan_sel_reg = BU27008_REG_MODE_CONTROL3, 731 .chan_sel_mask = BU27008_MASK_CHAN_SEL, 732 .int_time_mask = BU27008_MASK_MEAS_MODE, 733 .part_id = BU27008_ID, 734}; 735 736#define BU27008_MAX_VALID_RESULT_WAIT_US 50000 737#define BU27008_VALID_RESULT_WAIT_QUANTA_US 1000 738 739static int bu27008_chan_read_data(struct bu27008_data *data, int reg, int *val) 740{ 741 int ret, valid; 742 __le16 tmp; 743 744 ret = regmap_read_poll_timeout(data->regmap, data->cd->valid_reg, 745 valid, (valid & BU27008_MASK_VALID), 746 BU27008_VALID_RESULT_WAIT_QUANTA_US, 747 BU27008_MAX_VALID_RESULT_WAIT_US); 748 if (ret) 749 return ret; 750 751 ret = regmap_bulk_read(data->regmap, reg, &tmp, sizeof(tmp)); 752 if (ret) 753 dev_err(data->dev, "Reading channel data failed\n"); 754 755 *val = le16_to_cpu(tmp); 756 757 return ret; 758} 759 760static int bu27008_get_gain(struct bu27008_data *data, struct iio_gts *gts, int *gain) 761{ 762 int ret, sel; 763 764 ret = data->cd->get_gain_sel(data, &sel); 765 if (ret) 766 return ret; 767 768 ret = iio_gts_find_gain_by_sel(gts, sel); 769 if (ret < 0) { 770 dev_err(data->dev, "unknown gain value 0x%x\n", sel); 771 return ret; 772 } 773 774 *gain = ret; 775 776 return 0; 777} 778 779static int bu27008_set_gain(struct bu27008_data *data, int gain) 780{ 781 int ret; 782 783 ret = iio_gts_find_sel_by_gain(&data->gts, gain); 784 if (ret < 0) 785 return ret; 786 787 return data->cd->write_gain_sel(data, ret); 788} 789 790static int bu27008_get_int_time_sel(struct bu27008_data *data, int *sel) 791{ 792 int ret, val; 793 794 ret = regmap_read(data->regmap, BU27008_REG_MODE_CONTROL1, &val); 795 if (ret) 796 return ret; 797 798 val &= data->cd->int_time_mask; 799 val >>= ffs(data->cd->int_time_mask) - 1; 800 801 *sel = val; 802 803 return 0; 804} 805 806static int bu27008_set_int_time_sel(struct bu27008_data *data, int sel) 807{ 808 sel <<= ffs(data->cd->int_time_mask) - 1; 809 810 return regmap_update_bits(data->regmap, BU27008_REG_MODE_CONTROL1, 811 data->cd->int_time_mask, sel); 812} 813 814static int bu27008_get_int_time_us(struct bu27008_data *data) 815{ 816 int ret, sel; 817 818 ret = bu27008_get_int_time_sel(data, &sel); 819 if (ret) 820 return ret; 821 822 return iio_gts_find_int_time_by_sel(&data->gts, sel); 823} 824 825static int _bu27008_get_scale(struct bu27008_data *data, bool ir, int *val, 826 int *val2) 827{ 828 struct iio_gts *gts; 829 int gain, ret; 830 831 if (ir) 832 gts = &data->gts_ir; 833 else 834 gts = &data->gts; 835 836 ret = bu27008_get_gain(data, gts, &gain); 837 if (ret) 838 return ret; 839 840 ret = bu27008_get_int_time_us(data); 841 if (ret < 0) 842 return ret; 843 844 return iio_gts_get_scale(gts, gain, ret, val, val2); 845} 846 847static int bu27008_get_scale(struct bu27008_data *data, bool ir, int *val, 848 int *val2) 849{ 850 int ret; 851 852 mutex_lock(&data->mutex); 853 ret = _bu27008_get_scale(data, ir, val, val2); 854 mutex_unlock(&data->mutex); 855 856 return ret; 857} 858 859static int bu27008_set_int_time(struct bu27008_data *data, int time) 860{ 861 int ret; 862 863 ret = iio_gts_find_sel_by_int_time(&data->gts, time); 864 if (ret < 0) 865 return ret; 866 867 return bu27008_set_int_time_sel(data, ret); 868} 869 870/* Try to change the time so that the scale is maintained */ 871static int bu27008_try_set_int_time(struct bu27008_data *data, int int_time_new) 872{ 873 int ret, old_time_sel, new_time_sel, old_gain, new_gain; 874 875 mutex_lock(&data->mutex); 876 877 ret = bu27008_get_int_time_sel(data, &old_time_sel); 878 if (ret < 0) 879 goto unlock_out; 880 881 if (!iio_gts_valid_time(&data->gts, int_time_new)) { 882 dev_dbg(data->dev, "Unsupported integration time %u\n", 883 int_time_new); 884 885 ret = -EINVAL; 886 goto unlock_out; 887 } 888 889 /* If we already use requested time, then we're done */ 890 new_time_sel = iio_gts_find_sel_by_int_time(&data->gts, int_time_new); 891 if (new_time_sel == old_time_sel) 892 goto unlock_out; 893 894 ret = bu27008_get_gain(data, &data->gts, &old_gain); 895 if (ret) 896 goto unlock_out; 897 898 ret = iio_gts_find_new_gain_sel_by_old_gain_time(&data->gts, old_gain, 899 old_time_sel, new_time_sel, &new_gain); 900 if (ret) { 901 int scale1, scale2; 902 bool ok; 903 904 _bu27008_get_scale(data, false, &scale1, &scale2); 905 dev_dbg(data->dev, 906 "Can't support time %u with current scale %u %u\n", 907 int_time_new, scale1, scale2); 908 909 if (new_gain < 0) 910 goto unlock_out; 911 912 /* 913 * If caller requests for integration time change and we 914 * can't support the scale - then the caller should be 915 * prepared to 'pick up the pieces and deal with the 916 * fact that the scale changed'. 917 */ 918 ret = iio_find_closest_gain_low(&data->gts, new_gain, &ok); 919 if (!ok) 920 dev_dbg(data->dev, "optimal gain out of range\n"); 921 922 if (ret < 0) { 923 dev_dbg(data->dev, 924 "Total gain increase. Risk of saturation"); 925 ret = iio_gts_get_min_gain(&data->gts); 926 if (ret < 0) 927 goto unlock_out; 928 } 929 new_gain = ret; 930 dev_dbg(data->dev, "scale changed, new gain %u\n", new_gain); 931 } 932 933 ret = bu27008_set_gain(data, new_gain); 934 if (ret) 935 goto unlock_out; 936 937 ret = bu27008_set_int_time(data, int_time_new); 938 939unlock_out: 940 mutex_unlock(&data->mutex); 941 942 return ret; 943} 944 945static int bu27008_meas_set(struct bu27008_data *data, bool enable) 946{ 947 if (enable) 948 return regmap_set_bits(data->regmap, data->cd->meas_en_reg, 949 data->cd->meas_en_mask); 950 return regmap_clear_bits(data->regmap, data->cd->meas_en_reg, 951 data->cd->meas_en_mask); 952} 953 954static int bu27008_chan_cfg(struct bu27008_data *data, 955 struct iio_chan_spec const *chan) 956{ 957 int chan_sel; 958 959 if (chan->scan_index == BU27008_BLUE) 960 chan_sel = BU27008_BLUE2_CLEAR3; 961 else 962 chan_sel = BU27008_CLEAR2_IR3; 963 964 /* 965 * prepare bitfield for channel sel. The FIELD_PREP works only when 966 * mask is constant. In our case the mask is assigned based on the 967 * chip type. Hence the open-coded FIELD_PREP here. We don't bother 968 * zeroing the irrelevant bits though - update_bits takes care of that. 969 */ 970 chan_sel <<= ffs(data->cd->chan_sel_mask) - 1; 971 972 return regmap_update_bits(data->regmap, data->cd->chan_sel_reg, 973 BU27008_MASK_CHAN_SEL, chan_sel); 974} 975 976static int bu27008_read_one(struct bu27008_data *data, struct iio_dev *idev, 977 struct iio_chan_spec const *chan, int *val, int *val2) 978{ 979 int ret, int_time; 980 981 ret = bu27008_chan_cfg(data, chan); 982 if (ret) 983 return ret; 984 985 ret = bu27008_meas_set(data, true); 986 if (ret) 987 return ret; 988 989 ret = bu27008_get_int_time_us(data); 990 if (ret < 0) 991 int_time = BU27008_MEAS_TIME_MAX_MS; 992 else 993 int_time = ret / USEC_PER_MSEC; 994 995 msleep(int_time); 996 997 ret = bu27008_chan_read_data(data, chan->address, val); 998 if (!ret) 999 ret = IIO_VAL_INT; 1000 1001 if (bu27008_meas_set(data, false)) 1002 dev_warn(data->dev, "measurement disabling failed\n"); 1003 1004 return ret; 1005} 1006 1007static int bu27008_read_raw(struct iio_dev *idev, 1008 struct iio_chan_spec const *chan, 1009 int *val, int *val2, long mask) 1010{ 1011 struct bu27008_data *data = iio_priv(idev); 1012 int busy, ret; 1013 1014 switch (mask) { 1015 case IIO_CHAN_INFO_RAW: 1016 busy = iio_device_claim_direct_mode(idev); 1017 if (busy) 1018 return -EBUSY; 1019 1020 mutex_lock(&data->mutex); 1021 ret = bu27008_read_one(data, idev, chan, val, val2); 1022 mutex_unlock(&data->mutex); 1023 1024 iio_device_release_direct_mode(idev); 1025 1026 return ret; 1027 1028 case IIO_CHAN_INFO_SCALE: 1029 ret = bu27008_get_scale(data, chan->scan_index == BU27008_IR, 1030 val, val2); 1031 if (ret) 1032 return ret; 1033 1034 return IIO_VAL_INT_PLUS_NANO; 1035 1036 case IIO_CHAN_INFO_INT_TIME: 1037 ret = bu27008_get_int_time_us(data); 1038 if (ret < 0) 1039 return ret; 1040 1041 *val = 0; 1042 *val2 = ret; 1043 1044 return IIO_VAL_INT_PLUS_MICRO; 1045 1046 default: 1047 return -EINVAL; 1048 } 1049} 1050 1051/* Called if the new scale could not be supported with existing int-time */ 1052static int bu27008_try_find_new_time_gain(struct bu27008_data *data, int val, 1053 int val2, int *gain_sel) 1054{ 1055 int i, ret, new_time_sel; 1056 1057 for (i = 0; i < data->gts.num_itime; i++) { 1058 new_time_sel = data->gts.itime_table[i].sel; 1059 ret = iio_gts_find_gain_sel_for_scale_using_time(&data->gts, 1060 new_time_sel, val, val2, gain_sel); 1061 if (!ret) 1062 break; 1063 } 1064 if (i == data->gts.num_itime) { 1065 dev_err(data->dev, "Can't support scale %u %u\n", val, val2); 1066 1067 return -EINVAL; 1068 } 1069 1070 return bu27008_set_int_time_sel(data, new_time_sel); 1071} 1072 1073static int bu27008_set_scale(struct bu27008_data *data, 1074 struct iio_chan_spec const *chan, 1075 int val, int val2) 1076{ 1077 int ret, gain_sel, time_sel; 1078 1079 if (chan->scan_index == BU27008_IR) 1080 return -EINVAL; 1081 1082 mutex_lock(&data->mutex); 1083 1084 ret = bu27008_get_int_time_sel(data, &time_sel); 1085 if (ret < 0) 1086 goto unlock_out; 1087 1088 ret = iio_gts_find_gain_sel_for_scale_using_time(&data->gts, time_sel, 1089 val, val2, &gain_sel); 1090 if (ret) { 1091 ret = bu27008_try_find_new_time_gain(data, val, val2, &gain_sel); 1092 if (ret) 1093 goto unlock_out; 1094 1095 } 1096 ret = data->cd->write_gain_sel(data, gain_sel); 1097 1098unlock_out: 1099 mutex_unlock(&data->mutex); 1100 1101 return ret; 1102} 1103 1104static int bu27008_write_raw_get_fmt(struct iio_dev *indio_dev, 1105 struct iio_chan_spec const *chan, 1106 long mask) 1107{ 1108 1109 switch (mask) { 1110 case IIO_CHAN_INFO_SCALE: 1111 return IIO_VAL_INT_PLUS_NANO; 1112 case IIO_CHAN_INFO_INT_TIME: 1113 return IIO_VAL_INT_PLUS_MICRO; 1114 default: 1115 return -EINVAL; 1116 } 1117} 1118 1119static int bu27008_write_raw(struct iio_dev *idev, 1120 struct iio_chan_spec const *chan, 1121 int val, int val2, long mask) 1122{ 1123 struct bu27008_data *data = iio_priv(idev); 1124 int ret; 1125 1126 /* 1127 * Do not allow changing scale when measurement is ongoing as doing so 1128 * could make values in the buffer inconsistent. 1129 */ 1130 ret = iio_device_claim_direct_mode(idev); 1131 if (ret) 1132 return ret; 1133 1134 switch (mask) { 1135 case IIO_CHAN_INFO_SCALE: 1136 ret = bu27008_set_scale(data, chan, val, val2); 1137 break; 1138 case IIO_CHAN_INFO_INT_TIME: 1139 if (val) { 1140 ret = -EINVAL; 1141 break; 1142 } 1143 ret = bu27008_try_set_int_time(data, val2); 1144 break; 1145 default: 1146 ret = -EINVAL; 1147 break; 1148 } 1149 iio_device_release_direct_mode(idev); 1150 1151 return ret; 1152} 1153 1154static int bu27008_read_avail(struct iio_dev *idev, 1155 struct iio_chan_spec const *chan, const int **vals, 1156 int *type, int *length, long mask) 1157{ 1158 struct bu27008_data *data = iio_priv(idev); 1159 1160 switch (mask) { 1161 case IIO_CHAN_INFO_INT_TIME: 1162 return iio_gts_avail_times(&data->gts, vals, type, length); 1163 case IIO_CHAN_INFO_SCALE: 1164 if (chan->channel2 == IIO_MOD_LIGHT_IR) 1165 return iio_gts_all_avail_scales(&data->gts_ir, vals, 1166 type, length); 1167 return iio_gts_all_avail_scales(&data->gts, vals, type, length); 1168 default: 1169 return -EINVAL; 1170 } 1171} 1172 1173static int bu27008_update_scan_mode(struct iio_dev *idev, 1174 const unsigned long *scan_mask) 1175{ 1176 struct bu27008_data *data = iio_priv(idev); 1177 int chan_sel; 1178 1179 /* Configure channel selection */ 1180 if (test_bit(BU27008_BLUE, idev->active_scan_mask)) { 1181 if (test_bit(BU27008_CLEAR, idev->active_scan_mask)) 1182 chan_sel = BU27008_BLUE2_CLEAR3; 1183 else 1184 chan_sel = BU27008_BLUE2_IR3; 1185 } else { 1186 chan_sel = BU27008_CLEAR2_IR3; 1187 } 1188 1189 chan_sel <<= ffs(data->cd->chan_sel_mask) - 1; 1190 1191 return regmap_update_bits(data->regmap, data->cd->chan_sel_reg, 1192 data->cd->chan_sel_mask, chan_sel); 1193} 1194 1195static const struct iio_info bu27008_info = { 1196 .read_raw = &bu27008_read_raw, 1197 .write_raw = &bu27008_write_raw, 1198 .write_raw_get_fmt = &bu27008_write_raw_get_fmt, 1199 .read_avail = &bu27008_read_avail, 1200 .update_scan_mode = bu27008_update_scan_mode, 1201 .validate_trigger = iio_validate_own_trigger, 1202}; 1203 1204static int bu27008_trigger_set_state(struct iio_trigger *trig, bool state) 1205{ 1206 struct bu27008_data *data = iio_trigger_get_drvdata(trig); 1207 int ret; 1208 1209 1210 if (state) 1211 ret = regmap_set_bits(data->regmap, data->cd->drdy_en_reg, 1212 data->cd->drdy_en_mask); 1213 else 1214 ret = regmap_clear_bits(data->regmap, data->cd->drdy_en_reg, 1215 data->cd->drdy_en_mask); 1216 if (ret) 1217 dev_err(data->dev, "Failed to set trigger state\n"); 1218 1219 return ret; 1220} 1221 1222static void bu27008_trigger_reenable(struct iio_trigger *trig) 1223{ 1224 struct bu27008_data *data = iio_trigger_get_drvdata(trig); 1225 1226 enable_irq(data->irq); 1227} 1228 1229static const struct iio_trigger_ops bu27008_trigger_ops = { 1230 .set_trigger_state = bu27008_trigger_set_state, 1231 .reenable = bu27008_trigger_reenable, 1232}; 1233 1234static irqreturn_t bu27008_trigger_handler(int irq, void *p) 1235{ 1236 struct iio_poll_func *pf = p; 1237 struct iio_dev *idev = pf->indio_dev; 1238 struct bu27008_data *data = iio_priv(idev); 1239 struct { 1240 __le16 chan[BU27008_NUM_HW_CHANS]; 1241 s64 ts __aligned(8); 1242 } raw; 1243 int ret, dummy; 1244 1245 memset(&raw, 0, sizeof(raw)); 1246 1247 /* 1248 * After some measurements, it seems reading the 1249 * BU27008_REG_MODE_CONTROL3 debounces the IRQ line 1250 */ 1251 ret = regmap_read(data->regmap, data->cd->valid_reg, &dummy); 1252 if (ret < 0) 1253 goto err_read; 1254 1255 ret = regmap_bulk_read(data->regmap, BU27008_REG_DATA0_LO, &raw.chan, 1256 sizeof(raw.chan)); 1257 if (ret < 0) 1258 goto err_read; 1259 1260 iio_push_to_buffers_with_timestamp(idev, &raw, pf->timestamp); 1261err_read: 1262 iio_trigger_notify_done(idev->trig); 1263 1264 return IRQ_HANDLED; 1265} 1266 1267static int bu27008_buffer_preenable(struct iio_dev *idev) 1268{ 1269 struct bu27008_data *data = iio_priv(idev); 1270 1271 return bu27008_meas_set(data, true); 1272} 1273 1274static int bu27008_buffer_postdisable(struct iio_dev *idev) 1275{ 1276 struct bu27008_data *data = iio_priv(idev); 1277 1278 return bu27008_meas_set(data, false); 1279} 1280 1281static const struct iio_buffer_setup_ops bu27008_buffer_ops = { 1282 .preenable = bu27008_buffer_preenable, 1283 .postdisable = bu27008_buffer_postdisable, 1284}; 1285 1286static irqreturn_t bu27008_data_rdy_poll(int irq, void *private) 1287{ 1288 /* 1289 * The BU27008 keeps IRQ asserted until we read the VALID bit from 1290 * a register. We need to keep the IRQ disabled until then. 1291 */ 1292 disable_irq_nosync(irq); 1293 iio_trigger_poll(private); 1294 1295 return IRQ_HANDLED; 1296} 1297 1298static int bu27008_setup_trigger(struct bu27008_data *data, struct iio_dev *idev) 1299{ 1300 struct iio_trigger *itrig; 1301 char *name; 1302 int ret; 1303 1304 ret = devm_iio_triggered_buffer_setup(data->dev, idev, 1305 &iio_pollfunc_store_time, 1306 bu27008_trigger_handler, 1307 &bu27008_buffer_ops); 1308 if (ret) 1309 return dev_err_probe(data->dev, ret, 1310 "iio_triggered_buffer_setup_ext FAIL\n"); 1311 1312 itrig = devm_iio_trigger_alloc(data->dev, "%sdata-rdy-dev%d", 1313 idev->name, iio_device_id(idev)); 1314 if (!itrig) 1315 return -ENOMEM; 1316 1317 data->trig = itrig; 1318 1319 itrig->ops = &bu27008_trigger_ops; 1320 iio_trigger_set_drvdata(itrig, data); 1321 1322 name = devm_kasprintf(data->dev, GFP_KERNEL, "%s-bu27008", 1323 dev_name(data->dev)); 1324 1325 ret = devm_request_irq(data->dev, data->irq, 1326 &bu27008_data_rdy_poll, 1327 0, name, itrig); 1328 if (ret) 1329 return dev_err_probe(data->dev, ret, "Could not request IRQ\n"); 1330 1331 ret = devm_iio_trigger_register(data->dev, itrig); 1332 if (ret) 1333 return dev_err_probe(data->dev, ret, 1334 "Trigger registration failed\n"); 1335 1336 /* set default trigger */ 1337 idev->trig = iio_trigger_get(itrig); 1338 1339 return 0; 1340} 1341 1342static int bu27008_probe(struct i2c_client *i2c) 1343{ 1344 struct device *dev = &i2c->dev; 1345 struct bu27008_data *data; 1346 struct regmap *regmap; 1347 unsigned int part_id, reg; 1348 struct iio_dev *idev; 1349 int ret; 1350 1351 idev = devm_iio_device_alloc(dev, sizeof(*data)); 1352 if (!idev) 1353 return -ENOMEM; 1354 1355 ret = devm_regulator_get_enable(dev, "vdd"); 1356 if (ret) 1357 return dev_err_probe(dev, ret, "Failed to get regulator\n"); 1358 1359 data = iio_priv(idev); 1360 1361 data->cd = device_get_match_data(&i2c->dev); 1362 if (!data->cd) 1363 return -ENODEV; 1364 1365 regmap = devm_regmap_init_i2c(i2c, data->cd->regmap_cfg); 1366 if (IS_ERR(regmap)) 1367 return dev_err_probe(dev, PTR_ERR(regmap), 1368 "Failed to initialize Regmap\n"); 1369 1370 1371 ret = regmap_read(regmap, BU27008_REG_SYSTEM_CONTROL, ®); 1372 if (ret) 1373 return dev_err_probe(dev, ret, "Failed to access sensor\n"); 1374 1375 part_id = FIELD_GET(BU27008_MASK_PART_ID, reg); 1376 1377 if (part_id != data->cd->part_id) 1378 dev_warn(dev, "unknown device 0x%x\n", part_id); 1379 1380 ret = devm_iio_init_iio_gts(dev, data->cd->scale1x, 0, data->cd->gains, 1381 data->cd->num_gains, data->cd->itimes, 1382 data->cd->num_itimes, &data->gts); 1383 if (ret) 1384 return ret; 1385 1386 ret = devm_iio_init_iio_gts(dev, data->cd->scale1x, 0, data->cd->gains_ir, 1387 data->cd->num_gains_ir, data->cd->itimes, 1388 data->cd->num_itimes, &data->gts_ir); 1389 if (ret) 1390 return ret; 1391 1392 mutex_init(&data->mutex); 1393 data->regmap = regmap; 1394 data->dev = dev; 1395 data->irq = i2c->irq; 1396 1397 idev->channels = bu27008_channels; 1398 idev->num_channels = ARRAY_SIZE(bu27008_channels); 1399 idev->name = data->cd->name; 1400 idev->info = &bu27008_info; 1401 idev->modes = INDIO_DIRECT_MODE; 1402 idev->available_scan_masks = bu27008_scan_masks; 1403 1404 ret = data->cd->chip_init(data); 1405 if (ret) 1406 return ret; 1407 1408 if (i2c->irq) { 1409 ret = bu27008_setup_trigger(data, idev); 1410 if (ret) 1411 return ret; 1412 } else { 1413 dev_info(dev, "No IRQ, buffered mode disabled\n"); 1414 } 1415 1416 ret = devm_iio_device_register(dev, idev); 1417 if (ret) 1418 return dev_err_probe(dev, ret, 1419 "Unable to register iio device\n"); 1420 1421 return 0; 1422} 1423 1424static const struct of_device_id bu27008_of_match[] = { 1425 { .compatible = "rohm,bu27008", .data = &bu27008_chip }, 1426 { .compatible = "rohm,bu27010", .data = &bu27010_chip }, 1427 { } 1428}; 1429MODULE_DEVICE_TABLE(of, bu27008_of_match); 1430 1431static struct i2c_driver bu27008_i2c_driver = { 1432 .driver = { 1433 .name = "bu27008", 1434 .of_match_table = bu27008_of_match, 1435 .probe_type = PROBE_PREFER_ASYNCHRONOUS, 1436 }, 1437 .probe = bu27008_probe, 1438}; 1439module_i2c_driver(bu27008_i2c_driver); 1440 1441MODULE_DESCRIPTION("ROHM BU27008 and BU27010 colour sensor driver"); 1442MODULE_AUTHOR("Matti Vaittinen <matti.vaittinen@fi.rohmeurope.com>"); 1443MODULE_LICENSE("GPL"); 1444MODULE_IMPORT_NS(IIO_GTS_HELPER); 1445