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/drivers/misc/bh1770glc.c

http://github.com/mirrors/linux
C | 1393 lines | 1051 code | 218 blank | 124 comment | 106 complexity | 8f538f54c04090755904f68bbe0b073c MD5 | raw file
   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * This file is part of the ROHM BH1770GLC / OSRAM SFH7770 sensor driver.
   4 * Chip is combined proximity and ambient light sensor.
   5 *
   6 * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
   7 *
   8 * Contact: Samu Onkalo <samu.p.onkalo@nokia.com>
   9 */
  10
  11#include <linux/kernel.h>
  12#include <linux/module.h>
  13#include <linux/i2c.h>
  14#include <linux/interrupt.h>
  15#include <linux/mutex.h>
  16#include <linux/platform_data/bh1770glc.h>
  17#include <linux/regulator/consumer.h>
  18#include <linux/pm_runtime.h>
  19#include <linux/workqueue.h>
  20#include <linux/delay.h>
  21#include <linux/wait.h>
  22#include <linux/slab.h>
  23
  24#define BH1770_ALS_CONTROL	0x80 /* ALS operation mode control */
  25#define BH1770_PS_CONTROL	0x81 /* PS operation mode control */
  26#define BH1770_I_LED		0x82 /* active LED and LED1, LED2 current */
  27#define BH1770_I_LED3		0x83 /* LED3 current setting */
  28#define BH1770_ALS_PS_MEAS	0x84 /* Forced mode trigger */
  29#define BH1770_PS_MEAS_RATE	0x85 /* PS meas. rate at stand alone mode */
  30#define BH1770_ALS_MEAS_RATE	0x86 /* ALS meas. rate at stand alone mode */
  31#define BH1770_PART_ID		0x8a /* Part number and revision ID */
  32#define BH1770_MANUFACT_ID	0x8b /* Manufacturerer ID */
  33#define BH1770_ALS_DATA_0	0x8c /* ALS DATA low byte */
  34#define BH1770_ALS_DATA_1	0x8d /* ALS DATA high byte */
  35#define BH1770_ALS_PS_STATUS	0x8e /* Measurement data and int status */
  36#define BH1770_PS_DATA_LED1	0x8f /* PS data from LED1 */
  37#define BH1770_PS_DATA_LED2	0x90 /* PS data from LED2 */
  38#define BH1770_PS_DATA_LED3	0x91 /* PS data from LED3 */
  39#define BH1770_INTERRUPT	0x92 /* Interrupt setting */
  40#define BH1770_PS_TH_LED1	0x93 /* PS interrupt threshold for LED1 */
  41#define BH1770_PS_TH_LED2	0x94 /* PS interrupt threshold for LED2 */
  42#define BH1770_PS_TH_LED3	0x95 /* PS interrupt threshold for LED3 */
  43#define BH1770_ALS_TH_UP_0	0x96 /* ALS upper threshold low byte */
  44#define BH1770_ALS_TH_UP_1	0x97 /* ALS upper threshold high byte */
  45#define BH1770_ALS_TH_LOW_0	0x98 /* ALS lower threshold low byte */
  46#define BH1770_ALS_TH_LOW_1	0x99 /* ALS lower threshold high byte */
  47
  48/* MANUFACT_ID */
  49#define BH1770_MANUFACT_ROHM	0x01
  50#define BH1770_MANUFACT_OSRAM	0x03
  51
  52/* PART_ID */
  53#define BH1770_PART		0x90
  54#define BH1770_PART_MASK	0xf0
  55#define BH1770_REV_MASK		0x0f
  56#define BH1770_REV_SHIFT	0
  57#define BH1770_REV_0		0x00
  58#define BH1770_REV_1		0x01
  59
  60/* Operating modes for both */
  61#define BH1770_STANDBY		0x00
  62#define BH1770_FORCED		0x02
  63#define BH1770_STANDALONE	0x03
  64#define BH1770_SWRESET		(0x01 << 2)
  65
  66#define BH1770_PS_TRIG_MEAS	(1 << 0)
  67#define BH1770_ALS_TRIG_MEAS	(1 << 1)
  68
  69/* Interrupt control */
  70#define BH1770_INT_OUTPUT_MODE	(1 << 3) /* 0 = latched */
  71#define BH1770_INT_POLARITY	(1 << 2) /* 1 = active high */
  72#define BH1770_INT_ALS_ENA	(1 << 1)
  73#define BH1770_INT_PS_ENA	(1 << 0)
  74
  75/* Interrupt status */
  76#define BH1770_INT_LED1_DATA	(1 << 0)
  77#define BH1770_INT_LED1_INT	(1 << 1)
  78#define BH1770_INT_LED2_DATA	(1 << 2)
  79#define BH1770_INT_LED2_INT	(1 << 3)
  80#define BH1770_INT_LED3_DATA	(1 << 4)
  81#define BH1770_INT_LED3_INT	(1 << 5)
  82#define BH1770_INT_LEDS_INT	((1 << 1) | (1 << 3) | (1 << 5))
  83#define BH1770_INT_ALS_DATA	(1 << 6)
  84#define BH1770_INT_ALS_INT	(1 << 7)
  85
  86/* Led channels */
  87#define BH1770_LED1		0x00
  88
  89#define BH1770_DISABLE		0
  90#define BH1770_ENABLE		1
  91#define BH1770_PROX_CHANNELS	1
  92
  93#define BH1770_LUX_DEFAULT_RATE	1 /* Index to lux rate table */
  94#define BH1770_PROX_DEFAULT_RATE 1 /* Direct HW value =~ 50Hz */
  95#define BH1770_PROX_DEF_RATE_THRESH 6 /* Direct HW value =~ 5 Hz */
  96#define BH1770_STARTUP_DELAY	50
  97#define BH1770_RESET_TIME	10
  98#define BH1770_TIMEOUT		2100 /* Timeout in 2.1 seconds */
  99
 100#define BH1770_LUX_RANGE	65535
 101#define BH1770_PROX_RANGE	255
 102#define BH1770_COEF_SCALER	1024
 103#define BH1770_CALIB_SCALER	8192
 104#define BH1770_LUX_NEUTRAL_CALIB_VALUE (1 * BH1770_CALIB_SCALER)
 105#define BH1770_LUX_DEF_THRES	1000
 106#define BH1770_PROX_DEF_THRES	70
 107#define BH1770_PROX_DEF_ABS_THRES   100
 108#define BH1770_DEFAULT_PERSISTENCE  10
 109#define BH1770_PROX_MAX_PERSISTENCE 50
 110#define BH1770_LUX_GA_SCALE	16384
 111#define BH1770_LUX_CF_SCALE	2048 /* CF ChipFactor */
 112#define BH1770_NEUTRAL_CF	BH1770_LUX_CF_SCALE
 113#define BH1770_LUX_CORR_SCALE	4096
 114
 115#define PROX_ABOVE_THRESHOLD	1
 116#define PROX_BELOW_THRESHOLD	0
 117
 118#define PROX_IGNORE_LUX_LIMIT	500
 119
 120struct bh1770_chip {
 121	struct bh1770_platform_data	*pdata;
 122	char				chipname[10];
 123	u8				revision;
 124	struct i2c_client		*client;
 125	struct regulator_bulk_data	regs[2];
 126	struct mutex			mutex; /* avoid parallel access */
 127	wait_queue_head_t		wait;
 128
 129	bool			int_mode_prox;
 130	bool			int_mode_lux;
 131	struct delayed_work	prox_work;
 132	u32	lux_cf; /* Chip specific factor */
 133	u32	lux_ga;
 134	u32	lux_calib;
 135	int	lux_rate_index;
 136	u32	lux_corr;
 137	u16	lux_data_raw;
 138	u16	lux_threshold_hi;
 139	u16	lux_threshold_lo;
 140	u16	lux_thres_hi_onchip;
 141	u16	lux_thres_lo_onchip;
 142	bool	lux_wait_result;
 143
 144	int	prox_enable_count;
 145	u16	prox_coef;
 146	u16	prox_const;
 147	int	prox_rate;
 148	int	prox_rate_threshold;
 149	u8	prox_persistence;
 150	u8	prox_persistence_counter;
 151	u8	prox_data;
 152	u8	prox_threshold;
 153	u8	prox_threshold_hw;
 154	bool	prox_force_update;
 155	u8	prox_abs_thres;
 156	u8	prox_led;
 157};
 158
 159static const char reg_vcc[] = "Vcc";
 160static const char reg_vleds[] = "Vleds";
 161
 162/*
 163 * Supported stand alone rates in ms from chip data sheet
 164 * {10, 20, 30, 40, 70, 100, 200, 500, 1000, 2000};
 165 */
 166static const s16 prox_rates_hz[] = {100, 50, 33, 25, 14, 10, 5, 2};
 167static const s16 prox_rates_ms[] = {10, 20, 30, 40, 70, 100, 200, 500};
 168
 169/*
 170 * Supported stand alone rates in ms from chip data sheet
 171 * {100, 200, 500, 1000, 2000};
 172 */
 173static const s16 lux_rates_hz[] = {10, 5, 2, 1, 0};
 174
 175/*
 176 * interrupt control functions are called while keeping chip->mutex
 177 * excluding module probe / remove
 178 */
 179static inline int bh1770_lux_interrupt_control(struct bh1770_chip *chip,
 180					int lux)
 181{
 182	chip->int_mode_lux = lux;
 183	/* Set interrupt modes, interrupt active low, latched */
 184	return i2c_smbus_write_byte_data(chip->client,
 185					BH1770_INTERRUPT,
 186					(lux << 1) | chip->int_mode_prox);
 187}
 188
 189static inline int bh1770_prox_interrupt_control(struct bh1770_chip *chip,
 190					int ps)
 191{
 192	chip->int_mode_prox = ps;
 193	return i2c_smbus_write_byte_data(chip->client,
 194					BH1770_INTERRUPT,
 195					(chip->int_mode_lux << 1) | (ps << 0));
 196}
 197
 198/* chip->mutex is always kept here */
 199static int bh1770_lux_rate(struct bh1770_chip *chip, int rate_index)
 200{
 201	/* sysfs may call this when the chip is powered off */
 202	if (pm_runtime_suspended(&chip->client->dev))
 203		return 0;
 204
 205	/* Proper proximity response needs fastest lux rate (100ms) */
 206	if (chip->prox_enable_count)
 207		rate_index = 0;
 208
 209	return i2c_smbus_write_byte_data(chip->client,
 210					BH1770_ALS_MEAS_RATE,
 211					rate_index);
 212}
 213
 214static int bh1770_prox_rate(struct bh1770_chip *chip, int mode)
 215{
 216	int rate;
 217
 218	rate = (mode == PROX_ABOVE_THRESHOLD) ?
 219		chip->prox_rate_threshold : chip->prox_rate;
 220
 221	return i2c_smbus_write_byte_data(chip->client,
 222					BH1770_PS_MEAS_RATE,
 223					rate);
 224}
 225
 226/* InfraredLED is controlled by the chip during proximity scanning */
 227static inline int bh1770_led_cfg(struct bh1770_chip *chip)
 228{
 229	/* LED cfg, current for leds 1 and 2 */
 230	return i2c_smbus_write_byte_data(chip->client,
 231					BH1770_I_LED,
 232					(BH1770_LED1 << 6) |
 233					(BH1770_LED_5mA << 3) |
 234					chip->prox_led);
 235}
 236
 237/*
 238 * Following two functions converts raw ps values from HW to normalized
 239 * values. Purpose is to compensate differences between different sensor
 240 * versions and variants so that result means about the same between
 241 * versions.
 242 */
 243static inline u8 bh1770_psraw_to_adjusted(struct bh1770_chip *chip, u8 psraw)
 244{
 245	u16 adjusted;
 246	adjusted = (u16)(((u32)(psraw + chip->prox_const) * chip->prox_coef) /
 247		BH1770_COEF_SCALER);
 248	if (adjusted > BH1770_PROX_RANGE)
 249		adjusted = BH1770_PROX_RANGE;
 250	return adjusted;
 251}
 252
 253static inline u8 bh1770_psadjusted_to_raw(struct bh1770_chip *chip, u8 ps)
 254{
 255	u16 raw;
 256
 257	raw = (((u32)ps * BH1770_COEF_SCALER) / chip->prox_coef);
 258	if (raw > chip->prox_const)
 259		raw = raw - chip->prox_const;
 260	else
 261		raw = 0;
 262	return raw;
 263}
 264
 265/*
 266 * Following two functions converts raw lux values from HW to normalized
 267 * values. Purpose is to compensate differences between different sensor
 268 * versions and variants so that result means about the same between
 269 * versions. Chip->mutex is kept when this is called.
 270 */
 271static int bh1770_prox_set_threshold(struct bh1770_chip *chip)
 272{
 273	u8 tmp = 0;
 274
 275	/* sysfs may call this when the chip is powered off */
 276	if (pm_runtime_suspended(&chip->client->dev))
 277		return 0;
 278
 279	tmp = bh1770_psadjusted_to_raw(chip, chip->prox_threshold);
 280	chip->prox_threshold_hw = tmp;
 281
 282	return	i2c_smbus_write_byte_data(chip->client, BH1770_PS_TH_LED1,
 283					tmp);
 284}
 285
 286static inline u16 bh1770_lux_raw_to_adjusted(struct bh1770_chip *chip, u16 raw)
 287{
 288	u32 lux;
 289	lux = ((u32)raw * chip->lux_corr) / BH1770_LUX_CORR_SCALE;
 290	return min(lux, (u32)BH1770_LUX_RANGE);
 291}
 292
 293static inline u16 bh1770_lux_adjusted_to_raw(struct bh1770_chip *chip,
 294					u16 adjusted)
 295{
 296	return (u32)adjusted * BH1770_LUX_CORR_SCALE / chip->lux_corr;
 297}
 298
 299/* chip->mutex is kept when this is called */
 300static int bh1770_lux_update_thresholds(struct bh1770_chip *chip,
 301					u16 threshold_hi, u16 threshold_lo)
 302{
 303	u8 data[4];
 304	int ret;
 305
 306	/* sysfs may call this when the chip is powered off */
 307	if (pm_runtime_suspended(&chip->client->dev))
 308		return 0;
 309
 310	/*
 311	 * Compensate threshold values with the correction factors if not
 312	 * set to minimum or maximum.
 313	 * Min & max values disables interrupts.
 314	 */
 315	if (threshold_hi != BH1770_LUX_RANGE && threshold_hi != 0)
 316		threshold_hi = bh1770_lux_adjusted_to_raw(chip, threshold_hi);
 317
 318	if (threshold_lo != BH1770_LUX_RANGE && threshold_lo != 0)
 319		threshold_lo = bh1770_lux_adjusted_to_raw(chip, threshold_lo);
 320
 321	if (chip->lux_thres_hi_onchip == threshold_hi &&
 322	    chip->lux_thres_lo_onchip == threshold_lo)
 323		return 0;
 324
 325	chip->lux_thres_hi_onchip = threshold_hi;
 326	chip->lux_thres_lo_onchip = threshold_lo;
 327
 328	data[0] = threshold_hi;
 329	data[1] = threshold_hi >> 8;
 330	data[2] = threshold_lo;
 331	data[3] = threshold_lo >> 8;
 332
 333	ret = i2c_smbus_write_i2c_block_data(chip->client,
 334					BH1770_ALS_TH_UP_0,
 335					ARRAY_SIZE(data),
 336					data);
 337	return ret;
 338}
 339
 340static int bh1770_lux_get_result(struct bh1770_chip *chip)
 341{
 342	u16 data;
 343	int ret;
 344
 345	ret = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_DATA_0);
 346	if (ret < 0)
 347		return ret;
 348
 349	data = ret & 0xff;
 350	ret = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_DATA_1);
 351	if (ret < 0)
 352		return ret;
 353
 354	chip->lux_data_raw = data | ((ret & 0xff) << 8);
 355
 356	return 0;
 357}
 358
 359/* Calculate correction value which contains chip and device specific parts */
 360static u32 bh1770_get_corr_value(struct bh1770_chip *chip)
 361{
 362	u32 tmp;
 363	/* Impact of glass attenuation correction */
 364	tmp = (BH1770_LUX_CORR_SCALE * chip->lux_ga) / BH1770_LUX_GA_SCALE;
 365	/* Impact of chip factor correction */
 366	tmp = (tmp * chip->lux_cf) / BH1770_LUX_CF_SCALE;
 367	/* Impact of Device specific calibration correction */
 368	tmp = (tmp * chip->lux_calib) / BH1770_CALIB_SCALER;
 369	return tmp;
 370}
 371
 372static int bh1770_lux_read_result(struct bh1770_chip *chip)
 373{
 374	bh1770_lux_get_result(chip);
 375	return bh1770_lux_raw_to_adjusted(chip, chip->lux_data_raw);
 376}
 377
 378/*
 379 * Chip on / off functions are called while keeping mutex except probe
 380 * or remove phase
 381 */
 382static int bh1770_chip_on(struct bh1770_chip *chip)
 383{
 384	int ret = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
 385					chip->regs);
 386	if (ret < 0)
 387		return ret;
 388
 389	usleep_range(BH1770_STARTUP_DELAY, BH1770_STARTUP_DELAY * 2);
 390
 391	/* Reset the chip */
 392	i2c_smbus_write_byte_data(chip->client, BH1770_ALS_CONTROL,
 393				BH1770_SWRESET);
 394	usleep_range(BH1770_RESET_TIME, BH1770_RESET_TIME * 2);
 395
 396	/*
 397	 * ALS is started always since proximity needs als results
 398	 * for realibility estimation.
 399	 * Let's assume dark until the first ALS measurement is ready.
 400	 */
 401	chip->lux_data_raw = 0;
 402	chip->prox_data = 0;
 403	ret = i2c_smbus_write_byte_data(chip->client,
 404					BH1770_ALS_CONTROL, BH1770_STANDALONE);
 405
 406	/* Assume reset defaults */
 407	chip->lux_thres_hi_onchip = BH1770_LUX_RANGE;
 408	chip->lux_thres_lo_onchip = 0;
 409
 410	return ret;
 411}
 412
 413static void bh1770_chip_off(struct bh1770_chip *chip)
 414{
 415	i2c_smbus_write_byte_data(chip->client,
 416					BH1770_INTERRUPT, BH1770_DISABLE);
 417	i2c_smbus_write_byte_data(chip->client,
 418				BH1770_ALS_CONTROL, BH1770_STANDBY);
 419	i2c_smbus_write_byte_data(chip->client,
 420				BH1770_PS_CONTROL, BH1770_STANDBY);
 421	regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
 422}
 423
 424/* chip->mutex is kept when this is called */
 425static int bh1770_prox_mode_control(struct bh1770_chip *chip)
 426{
 427	if (chip->prox_enable_count) {
 428		chip->prox_force_update = true; /* Force immediate update */
 429
 430		bh1770_lux_rate(chip, chip->lux_rate_index);
 431		bh1770_prox_set_threshold(chip);
 432		bh1770_led_cfg(chip);
 433		bh1770_prox_rate(chip, PROX_BELOW_THRESHOLD);
 434		bh1770_prox_interrupt_control(chip, BH1770_ENABLE);
 435		i2c_smbus_write_byte_data(chip->client,
 436					BH1770_PS_CONTROL, BH1770_STANDALONE);
 437	} else {
 438		chip->prox_data = 0;
 439		bh1770_lux_rate(chip, chip->lux_rate_index);
 440		bh1770_prox_interrupt_control(chip, BH1770_DISABLE);
 441		i2c_smbus_write_byte_data(chip->client,
 442					BH1770_PS_CONTROL, BH1770_STANDBY);
 443	}
 444	return 0;
 445}
 446
 447/* chip->mutex is kept when this is called */
 448static int bh1770_prox_read_result(struct bh1770_chip *chip)
 449{
 450	int ret;
 451	bool above;
 452	u8 mode;
 453
 454	ret = i2c_smbus_read_byte_data(chip->client, BH1770_PS_DATA_LED1);
 455	if (ret < 0)
 456		goto out;
 457
 458	if (ret > chip->prox_threshold_hw)
 459		above = true;
 460	else
 461		above = false;
 462
 463	/*
 464	 * when ALS levels goes above limit, proximity result may be
 465	 * false proximity. Thus ignore the result. With real proximity
 466	 * there is a shadow causing low als levels.
 467	 */
 468	if (chip->lux_data_raw > PROX_IGNORE_LUX_LIMIT)
 469		ret = 0;
 470
 471	chip->prox_data = bh1770_psraw_to_adjusted(chip, ret);
 472
 473	/* Strong proximity level or force mode requires immediate response */
 474	if (chip->prox_data >= chip->prox_abs_thres ||
 475	    chip->prox_force_update)
 476		chip->prox_persistence_counter = chip->prox_persistence;
 477
 478	chip->prox_force_update = false;
 479
 480	/* Persistence filttering to reduce false proximity events */
 481	if (likely(above)) {
 482		if (chip->prox_persistence_counter < chip->prox_persistence) {
 483			chip->prox_persistence_counter++;
 484			ret = -ENODATA;
 485		} else {
 486			mode = PROX_ABOVE_THRESHOLD;
 487			ret = 0;
 488		}
 489	} else {
 490		chip->prox_persistence_counter = 0;
 491		mode = PROX_BELOW_THRESHOLD;
 492		chip->prox_data = 0;
 493		ret = 0;
 494	}
 495
 496	/* Set proximity detection rate based on above or below value */
 497	if (ret == 0) {
 498		bh1770_prox_rate(chip, mode);
 499		sysfs_notify(&chip->client->dev.kobj, NULL, "prox0_raw");
 500	}
 501out:
 502	return ret;
 503}
 504
 505static int bh1770_detect(struct bh1770_chip *chip)
 506{
 507	struct i2c_client *client = chip->client;
 508	s32 ret;
 509	u8 manu, part;
 510
 511	ret = i2c_smbus_read_byte_data(client, BH1770_MANUFACT_ID);
 512	if (ret < 0)
 513		goto error;
 514	manu = (u8)ret;
 515
 516	ret = i2c_smbus_read_byte_data(client, BH1770_PART_ID);
 517	if (ret < 0)
 518		goto error;
 519	part = (u8)ret;
 520
 521	chip->revision = (part & BH1770_REV_MASK) >> BH1770_REV_SHIFT;
 522	chip->prox_coef = BH1770_COEF_SCALER;
 523	chip->prox_const = 0;
 524	chip->lux_cf = BH1770_NEUTRAL_CF;
 525
 526	if ((manu == BH1770_MANUFACT_ROHM) &&
 527	    ((part & BH1770_PART_MASK) == BH1770_PART)) {
 528		snprintf(chip->chipname, sizeof(chip->chipname), "BH1770GLC");
 529		return 0;
 530	}
 531
 532	if ((manu == BH1770_MANUFACT_OSRAM) &&
 533	    ((part & BH1770_PART_MASK) == BH1770_PART)) {
 534		snprintf(chip->chipname, sizeof(chip->chipname), "SFH7770");
 535		/* Values selected by comparing different versions */
 536		chip->prox_coef = 819; /* 0.8 * BH1770_COEF_SCALER */
 537		chip->prox_const = 40;
 538		return 0;
 539	}
 540
 541	ret = -ENODEV;
 542error:
 543	dev_dbg(&client->dev, "BH1770 or SFH7770 not found\n");
 544
 545	return ret;
 546}
 547
 548/*
 549 * This work is re-scheduled at every proximity interrupt.
 550 * If this work is running, it means that there hasn't been any
 551 * proximity interrupt in time. Situation is handled as no-proximity.
 552 * It would be nice to have low-threshold interrupt or interrupt
 553 * when measurement and hi-threshold are both 0. But neither of those exists.
 554 * This is a workaroud for missing HW feature.
 555 */
 556
 557static void bh1770_prox_work(struct work_struct *work)
 558{
 559	struct bh1770_chip *chip =
 560		container_of(work, struct bh1770_chip, prox_work.work);
 561
 562	mutex_lock(&chip->mutex);
 563	bh1770_prox_read_result(chip);
 564	mutex_unlock(&chip->mutex);
 565}
 566
 567/* This is threaded irq handler */
 568static irqreturn_t bh1770_irq(int irq, void *data)
 569{
 570	struct bh1770_chip *chip = data;
 571	int status;
 572	int rate = 0;
 573
 574	mutex_lock(&chip->mutex);
 575	status = i2c_smbus_read_byte_data(chip->client, BH1770_ALS_PS_STATUS);
 576
 577	/* Acknowledge interrupt by reading this register */
 578	i2c_smbus_read_byte_data(chip->client, BH1770_INTERRUPT);
 579
 580	/*
 581	 * Check if there is fresh data available for als.
 582	 * If this is the very first data, update thresholds after that.
 583	 */
 584	if (status & BH1770_INT_ALS_DATA) {
 585		bh1770_lux_get_result(chip);
 586		if (unlikely(chip->lux_wait_result)) {
 587			chip->lux_wait_result = false;
 588			wake_up(&chip->wait);
 589			bh1770_lux_update_thresholds(chip,
 590						chip->lux_threshold_hi,
 591						chip->lux_threshold_lo);
 592		}
 593	}
 594
 595	/* Disable interrupt logic to guarantee acknowledgement */
 596	i2c_smbus_write_byte_data(chip->client, BH1770_INTERRUPT,
 597				  (0 << 1) | (0 << 0));
 598
 599	if ((status & BH1770_INT_ALS_INT))
 600		sysfs_notify(&chip->client->dev.kobj, NULL, "lux0_input");
 601
 602	if (chip->int_mode_prox && (status & BH1770_INT_LEDS_INT)) {
 603		rate = prox_rates_ms[chip->prox_rate_threshold];
 604		bh1770_prox_read_result(chip);
 605	}
 606
 607	/* Re-enable interrupt logic */
 608	i2c_smbus_write_byte_data(chip->client, BH1770_INTERRUPT,
 609				  (chip->int_mode_lux << 1) |
 610				  (chip->int_mode_prox << 0));
 611	mutex_unlock(&chip->mutex);
 612
 613	/*
 614	 * Can't cancel work while keeping mutex since the work uses the
 615	 * same mutex.
 616	 */
 617	if (rate) {
 618		/*
 619		 * Simulate missing no-proximity interrupt 50ms after the
 620		 * next expected interrupt time.
 621		 */
 622		cancel_delayed_work_sync(&chip->prox_work);
 623		schedule_delayed_work(&chip->prox_work,
 624				msecs_to_jiffies(rate + 50));
 625	}
 626	return IRQ_HANDLED;
 627}
 628
 629static ssize_t bh1770_power_state_store(struct device *dev,
 630				      struct device_attribute *attr,
 631				      const char *buf, size_t count)
 632{
 633	struct bh1770_chip *chip =  dev_get_drvdata(dev);
 634	unsigned long value;
 635	ssize_t ret;
 636
 637	ret = kstrtoul(buf, 0, &value);
 638	if (ret)
 639		return ret;
 640
 641	mutex_lock(&chip->mutex);
 642	if (value) {
 643		pm_runtime_get_sync(dev);
 644
 645		ret = bh1770_lux_rate(chip, chip->lux_rate_index);
 646		if (ret < 0) {
 647			pm_runtime_put(dev);
 648			goto leave;
 649		}
 650
 651		ret = bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
 652		if (ret < 0) {
 653			pm_runtime_put(dev);
 654			goto leave;
 655		}
 656
 657		/* This causes interrupt after the next measurement cycle */
 658		bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
 659					BH1770_LUX_DEF_THRES);
 660		/* Inform that we are waiting for a result from ALS */
 661		chip->lux_wait_result = true;
 662		bh1770_prox_mode_control(chip);
 663	} else if (!pm_runtime_suspended(dev)) {
 664		pm_runtime_put(dev);
 665	}
 666	ret = count;
 667leave:
 668	mutex_unlock(&chip->mutex);
 669	return ret;
 670}
 671
 672static ssize_t bh1770_power_state_show(struct device *dev,
 673				   struct device_attribute *attr, char *buf)
 674{
 675	return sprintf(buf, "%d\n", !pm_runtime_suspended(dev));
 676}
 677
 678static ssize_t bh1770_lux_result_show(struct device *dev,
 679				   struct device_attribute *attr, char *buf)
 680{
 681	struct bh1770_chip *chip =  dev_get_drvdata(dev);
 682	ssize_t ret;
 683	long timeout;
 684
 685	if (pm_runtime_suspended(dev))
 686		return -EIO; /* Chip is not enabled at all */
 687
 688	timeout = wait_event_interruptible_timeout(chip->wait,
 689					!chip->lux_wait_result,
 690					msecs_to_jiffies(BH1770_TIMEOUT));
 691	if (!timeout)
 692		return -EIO;
 693
 694	mutex_lock(&chip->mutex);
 695	ret = sprintf(buf, "%d\n", bh1770_lux_read_result(chip));
 696	mutex_unlock(&chip->mutex);
 697
 698	return ret;
 699}
 700
 701static ssize_t bh1770_lux_range_show(struct device *dev,
 702				   struct device_attribute *attr, char *buf)
 703{
 704	return sprintf(buf, "%d\n", BH1770_LUX_RANGE);
 705}
 706
 707static ssize_t bh1770_prox_enable_store(struct device *dev,
 708				      struct device_attribute *attr,
 709				      const char *buf, size_t count)
 710{
 711	struct bh1770_chip *chip =  dev_get_drvdata(dev);
 712	unsigned long value;
 713	int ret;
 714
 715	ret = kstrtoul(buf, 0, &value);
 716	if (ret)
 717		return ret;
 718
 719	mutex_lock(&chip->mutex);
 720	/* Assume no proximity. Sensor will tell real state soon */
 721	if (!chip->prox_enable_count)
 722		chip->prox_data = 0;
 723
 724	if (value)
 725		chip->prox_enable_count++;
 726	else if (chip->prox_enable_count > 0)
 727		chip->prox_enable_count--;
 728	else
 729		goto leave;
 730
 731	/* Run control only when chip is powered on */
 732	if (!pm_runtime_suspended(dev))
 733		bh1770_prox_mode_control(chip);
 734leave:
 735	mutex_unlock(&chip->mutex);
 736	return count;
 737}
 738
 739static ssize_t bh1770_prox_enable_show(struct device *dev,
 740				   struct device_attribute *attr, char *buf)
 741{
 742	struct bh1770_chip *chip =  dev_get_drvdata(dev);
 743	ssize_t len;
 744
 745	mutex_lock(&chip->mutex);
 746	len = sprintf(buf, "%d\n", chip->prox_enable_count);
 747	mutex_unlock(&chip->mutex);
 748	return len;
 749}
 750
 751static ssize_t bh1770_prox_result_show(struct device *dev,
 752				   struct device_attribute *attr, char *buf)
 753{
 754	struct bh1770_chip *chip =  dev_get_drvdata(dev);
 755	ssize_t ret;
 756
 757	mutex_lock(&chip->mutex);
 758	if (chip->prox_enable_count && !pm_runtime_suspended(dev))
 759		ret = sprintf(buf, "%d\n", chip->prox_data);
 760	else
 761		ret = -EIO;
 762	mutex_unlock(&chip->mutex);
 763	return ret;
 764}
 765
 766static ssize_t bh1770_prox_range_show(struct device *dev,
 767				   struct device_attribute *attr, char *buf)
 768{
 769	return sprintf(buf, "%d\n", BH1770_PROX_RANGE);
 770}
 771
 772static ssize_t bh1770_get_prox_rate_avail(struct device *dev,
 773				   struct device_attribute *attr, char *buf)
 774{
 775	int i;
 776	int pos = 0;
 777	for (i = 0; i < ARRAY_SIZE(prox_rates_hz); i++)
 778		pos += sprintf(buf + pos, "%d ", prox_rates_hz[i]);
 779	sprintf(buf + pos - 1, "\n");
 780	return pos;
 781}
 782
 783static ssize_t bh1770_get_prox_rate_above(struct device *dev,
 784				   struct device_attribute *attr, char *buf)
 785{
 786	struct bh1770_chip *chip =  dev_get_drvdata(dev);
 787	return sprintf(buf, "%d\n", prox_rates_hz[chip->prox_rate_threshold]);
 788}
 789
 790static ssize_t bh1770_get_prox_rate_below(struct device *dev,
 791				   struct device_attribute *attr, char *buf)
 792{
 793	struct bh1770_chip *chip =  dev_get_drvdata(dev);
 794	return sprintf(buf, "%d\n", prox_rates_hz[chip->prox_rate]);
 795}
 796
 797static int bh1770_prox_rate_validate(int rate)
 798{
 799	int i;
 800
 801	for (i = 0; i < ARRAY_SIZE(prox_rates_hz) - 1; i++)
 802		if (rate >= prox_rates_hz[i])
 803			break;
 804	return i;
 805}
 806
 807static ssize_t bh1770_set_prox_rate_above(struct device *dev,
 808					struct device_attribute *attr,
 809					const char *buf, size_t count)
 810{
 811	struct bh1770_chip *chip =  dev_get_drvdata(dev);
 812	unsigned long value;
 813	int ret;
 814
 815	ret = kstrtoul(buf, 0, &value);
 816	if (ret)
 817		return ret;
 818
 819	mutex_lock(&chip->mutex);
 820	chip->prox_rate_threshold = bh1770_prox_rate_validate(value);
 821	mutex_unlock(&chip->mutex);
 822	return count;
 823}
 824
 825static ssize_t bh1770_set_prox_rate_below(struct device *dev,
 826					struct device_attribute *attr,
 827					const char *buf, size_t count)
 828{
 829	struct bh1770_chip *chip =  dev_get_drvdata(dev);
 830	unsigned long value;
 831	int ret;
 832
 833	ret = kstrtoul(buf, 0, &value);
 834	if (ret)
 835		return ret;
 836
 837	mutex_lock(&chip->mutex);
 838	chip->prox_rate = bh1770_prox_rate_validate(value);
 839	mutex_unlock(&chip->mutex);
 840	return count;
 841}
 842
 843static ssize_t bh1770_get_prox_thres(struct device *dev,
 844				   struct device_attribute *attr, char *buf)
 845{
 846	struct bh1770_chip *chip =  dev_get_drvdata(dev);
 847	return sprintf(buf, "%d\n", chip->prox_threshold);
 848}
 849
 850static ssize_t bh1770_set_prox_thres(struct device *dev,
 851				      struct device_attribute *attr,
 852				      const char *buf, size_t count)
 853{
 854	struct bh1770_chip *chip =  dev_get_drvdata(dev);
 855	unsigned long value;
 856	int ret;
 857
 858	ret = kstrtoul(buf, 0, &value);
 859	if (ret)
 860		return ret;
 861
 862	if (value > BH1770_PROX_RANGE)
 863		return -EINVAL;
 864
 865	mutex_lock(&chip->mutex);
 866	chip->prox_threshold = value;
 867	ret = bh1770_prox_set_threshold(chip);
 868	mutex_unlock(&chip->mutex);
 869	if (ret < 0)
 870		return ret;
 871	return count;
 872}
 873
 874static ssize_t bh1770_prox_persistence_show(struct device *dev,
 875				 struct device_attribute *attr, char *buf)
 876{
 877	struct bh1770_chip *chip = dev_get_drvdata(dev);
 878
 879	return sprintf(buf, "%u\n", chip->prox_persistence);
 880}
 881
 882static ssize_t bh1770_prox_persistence_store(struct device *dev,
 883				struct device_attribute *attr,
 884				const char *buf, size_t len)
 885{
 886	struct bh1770_chip *chip = dev_get_drvdata(dev);
 887	unsigned long value;
 888	int ret;
 889
 890	ret = kstrtoul(buf, 0, &value);
 891	if (ret)
 892		return ret;
 893
 894	if (value > BH1770_PROX_MAX_PERSISTENCE)
 895		return -EINVAL;
 896
 897	chip->prox_persistence = value;
 898
 899	return len;
 900}
 901
 902static ssize_t bh1770_prox_abs_thres_show(struct device *dev,
 903				 struct device_attribute *attr, char *buf)
 904{
 905	struct bh1770_chip *chip = dev_get_drvdata(dev);
 906	return sprintf(buf, "%u\n", chip->prox_abs_thres);
 907}
 908
 909static ssize_t bh1770_prox_abs_thres_store(struct device *dev,
 910				struct device_attribute *attr,
 911				const char *buf, size_t len)
 912{
 913	struct bh1770_chip *chip = dev_get_drvdata(dev);
 914	unsigned long value;
 915	int ret;
 916
 917	ret = kstrtoul(buf, 0, &value);
 918	if (ret)
 919		return ret;
 920
 921	if (value > BH1770_PROX_RANGE)
 922		return -EINVAL;
 923
 924	chip->prox_abs_thres = value;
 925
 926	return len;
 927}
 928
 929static ssize_t bh1770_chip_id_show(struct device *dev,
 930				   struct device_attribute *attr, char *buf)
 931{
 932	struct bh1770_chip *chip =  dev_get_drvdata(dev);
 933	return sprintf(buf, "%s rev %d\n", chip->chipname, chip->revision);
 934}
 935
 936static ssize_t bh1770_lux_calib_default_show(struct device *dev,
 937				 struct device_attribute *attr, char *buf)
 938{
 939	return sprintf(buf, "%u\n", BH1770_CALIB_SCALER);
 940}
 941
 942static ssize_t bh1770_lux_calib_show(struct device *dev,
 943				 struct device_attribute *attr, char *buf)
 944{
 945	struct bh1770_chip *chip = dev_get_drvdata(dev);
 946	ssize_t len;
 947
 948	mutex_lock(&chip->mutex);
 949	len = sprintf(buf, "%u\n", chip->lux_calib);
 950	mutex_unlock(&chip->mutex);
 951	return len;
 952}
 953
 954static ssize_t bh1770_lux_calib_store(struct device *dev,
 955				  struct device_attribute *attr,
 956				  const char *buf, size_t len)
 957{
 958	struct bh1770_chip *chip = dev_get_drvdata(dev);
 959	unsigned long value;
 960	u32 old_calib;
 961	u32 new_corr;
 962	int ret;
 963
 964	ret = kstrtoul(buf, 0, &value);
 965	if (ret)
 966		return ret;
 967
 968	mutex_lock(&chip->mutex);
 969	old_calib = chip->lux_calib;
 970	chip->lux_calib = value;
 971	new_corr = bh1770_get_corr_value(chip);
 972	if (new_corr == 0) {
 973		chip->lux_calib = old_calib;
 974		mutex_unlock(&chip->mutex);
 975		return -EINVAL;
 976	}
 977	chip->lux_corr = new_corr;
 978	/* Refresh thresholds on HW after changing correction value */
 979	bh1770_lux_update_thresholds(chip, chip->lux_threshold_hi,
 980				chip->lux_threshold_lo);
 981
 982	mutex_unlock(&chip->mutex);
 983
 984	return len;
 985}
 986
 987static ssize_t bh1770_get_lux_rate_avail(struct device *dev,
 988				   struct device_attribute *attr, char *buf)
 989{
 990	int i;
 991	int pos = 0;
 992	for (i = 0; i < ARRAY_SIZE(lux_rates_hz); i++)
 993		pos += sprintf(buf + pos, "%d ", lux_rates_hz[i]);
 994	sprintf(buf + pos - 1, "\n");
 995	return pos;
 996}
 997
 998static ssize_t bh1770_get_lux_rate(struct device *dev,
 999				   struct device_attribute *attr, char *buf)
1000{
1001	struct bh1770_chip *chip =  dev_get_drvdata(dev);
1002	return sprintf(buf, "%d\n", lux_rates_hz[chip->lux_rate_index]);
1003}
1004
1005static ssize_t bh1770_set_lux_rate(struct device *dev,
1006				      struct device_attribute *attr,
1007				      const char *buf, size_t count)
1008{
1009	struct bh1770_chip *chip =  dev_get_drvdata(dev);
1010	unsigned long rate_hz;
1011	int ret, i;
1012
1013	ret = kstrtoul(buf, 0, &rate_hz);
1014	if (ret)
1015		return ret;
1016
1017	for (i = 0; i < ARRAY_SIZE(lux_rates_hz) - 1; i++)
1018		if (rate_hz >= lux_rates_hz[i])
1019			break;
1020
1021	mutex_lock(&chip->mutex);
1022	chip->lux_rate_index = i;
1023	ret = bh1770_lux_rate(chip, i);
1024	mutex_unlock(&chip->mutex);
1025
1026	if (ret < 0)
1027		return ret;
1028
1029	return count;
1030}
1031
1032static ssize_t bh1770_get_lux_thresh_above(struct device *dev,
1033				   struct device_attribute *attr, char *buf)
1034{
1035	struct bh1770_chip *chip =  dev_get_drvdata(dev);
1036	return sprintf(buf, "%d\n", chip->lux_threshold_hi);
1037}
1038
1039static ssize_t bh1770_get_lux_thresh_below(struct device *dev,
1040				   struct device_attribute *attr, char *buf)
1041{
1042	struct bh1770_chip *chip =  dev_get_drvdata(dev);
1043	return sprintf(buf, "%d\n", chip->lux_threshold_lo);
1044}
1045
1046static ssize_t bh1770_set_lux_thresh(struct bh1770_chip *chip, u16 *target,
1047				const char *buf)
1048{
1049	unsigned long thresh;
1050	int ret;
1051
1052	ret = kstrtoul(buf, 0, &thresh);
1053	if (ret)
1054		return ret;
1055
1056	if (thresh > BH1770_LUX_RANGE)
1057		return -EINVAL;
1058
1059	mutex_lock(&chip->mutex);
1060	*target = thresh;
1061	/*
1062	 * Don't update values in HW if we are still waiting for
1063	 * first interrupt to come after device handle open call.
1064	 */
1065	if (!chip->lux_wait_result)
1066		ret = bh1770_lux_update_thresholds(chip,
1067						chip->lux_threshold_hi,
1068						chip->lux_threshold_lo);
1069	mutex_unlock(&chip->mutex);
1070	return ret;
1071
1072}
1073
1074static ssize_t bh1770_set_lux_thresh_above(struct device *dev,
1075				  struct device_attribute *attr,
1076				  const char *buf, size_t len)
1077{
1078	struct bh1770_chip *chip =  dev_get_drvdata(dev);
1079	int ret = bh1770_set_lux_thresh(chip, &chip->lux_threshold_hi, buf);
1080	if (ret < 0)
1081		return ret;
1082	return len;
1083}
1084
1085static ssize_t bh1770_set_lux_thresh_below(struct device *dev,
1086				  struct device_attribute *attr,
1087				  const char *buf, size_t len)
1088{
1089	struct bh1770_chip *chip =  dev_get_drvdata(dev);
1090	int ret = bh1770_set_lux_thresh(chip, &chip->lux_threshold_lo, buf);
1091	if (ret < 0)
1092		return ret;
1093	return len;
1094}
1095
1096static DEVICE_ATTR(prox0_raw_en, S_IRUGO | S_IWUSR, bh1770_prox_enable_show,
1097						bh1770_prox_enable_store);
1098static DEVICE_ATTR(prox0_thresh_above1_value, S_IRUGO | S_IWUSR,
1099						bh1770_prox_abs_thres_show,
1100						bh1770_prox_abs_thres_store);
1101static DEVICE_ATTR(prox0_thresh_above0_value, S_IRUGO | S_IWUSR,
1102						bh1770_get_prox_thres,
1103						bh1770_set_prox_thres);
1104static DEVICE_ATTR(prox0_raw, S_IRUGO, bh1770_prox_result_show, NULL);
1105static DEVICE_ATTR(prox0_sensor_range, S_IRUGO, bh1770_prox_range_show, NULL);
1106static DEVICE_ATTR(prox0_thresh_above_count, S_IRUGO | S_IWUSR,
1107						bh1770_prox_persistence_show,
1108						bh1770_prox_persistence_store);
1109static DEVICE_ATTR(prox0_rate_above, S_IRUGO | S_IWUSR,
1110						bh1770_get_prox_rate_above,
1111						bh1770_set_prox_rate_above);
1112static DEVICE_ATTR(prox0_rate_below, S_IRUGO | S_IWUSR,
1113						bh1770_get_prox_rate_below,
1114						bh1770_set_prox_rate_below);
1115static DEVICE_ATTR(prox0_rate_avail, S_IRUGO, bh1770_get_prox_rate_avail, NULL);
1116
1117static DEVICE_ATTR(lux0_calibscale, S_IRUGO | S_IWUSR, bh1770_lux_calib_show,
1118						bh1770_lux_calib_store);
1119static DEVICE_ATTR(lux0_calibscale_default, S_IRUGO,
1120						bh1770_lux_calib_default_show,
1121						NULL);
1122static DEVICE_ATTR(lux0_input, S_IRUGO, bh1770_lux_result_show, NULL);
1123static DEVICE_ATTR(lux0_sensor_range, S_IRUGO, bh1770_lux_range_show, NULL);
1124static DEVICE_ATTR(lux0_rate, S_IRUGO | S_IWUSR, bh1770_get_lux_rate,
1125						bh1770_set_lux_rate);
1126static DEVICE_ATTR(lux0_rate_avail, S_IRUGO, bh1770_get_lux_rate_avail, NULL);
1127static DEVICE_ATTR(lux0_thresh_above_value, S_IRUGO | S_IWUSR,
1128						bh1770_get_lux_thresh_above,
1129						bh1770_set_lux_thresh_above);
1130static DEVICE_ATTR(lux0_thresh_below_value, S_IRUGO | S_IWUSR,
1131						bh1770_get_lux_thresh_below,
1132						bh1770_set_lux_thresh_below);
1133static DEVICE_ATTR(chip_id, S_IRUGO, bh1770_chip_id_show, NULL);
1134static DEVICE_ATTR(power_state, S_IRUGO | S_IWUSR, bh1770_power_state_show,
1135						 bh1770_power_state_store);
1136
1137
1138static struct attribute *sysfs_attrs[] = {
1139	&dev_attr_lux0_calibscale.attr,
1140	&dev_attr_lux0_calibscale_default.attr,
1141	&dev_attr_lux0_input.attr,
1142	&dev_attr_lux0_sensor_range.attr,
1143	&dev_attr_lux0_rate.attr,
1144	&dev_attr_lux0_rate_avail.attr,
1145	&dev_attr_lux0_thresh_above_value.attr,
1146	&dev_attr_lux0_thresh_below_value.attr,
1147	&dev_attr_prox0_raw.attr,
1148	&dev_attr_prox0_sensor_range.attr,
1149	&dev_attr_prox0_raw_en.attr,
1150	&dev_attr_prox0_thresh_above_count.attr,
1151	&dev_attr_prox0_rate_above.attr,
1152	&dev_attr_prox0_rate_below.attr,
1153	&dev_attr_prox0_rate_avail.attr,
1154	&dev_attr_prox0_thresh_above0_value.attr,
1155	&dev_attr_prox0_thresh_above1_value.attr,
1156	&dev_attr_chip_id.attr,
1157	&dev_attr_power_state.attr,
1158	NULL
1159};
1160
1161static const struct attribute_group bh1770_attribute_group = {
1162	.attrs = sysfs_attrs
1163};
1164
1165static int bh1770_probe(struct i2c_client *client,
1166				const struct i2c_device_id *id)
1167{
1168	struct bh1770_chip *chip;
1169	int err;
1170
1171	chip = devm_kzalloc(&client->dev, sizeof *chip, GFP_KERNEL);
1172	if (!chip)
1173		return -ENOMEM;
1174
1175	i2c_set_clientdata(client, chip);
1176	chip->client  = client;
1177
1178	mutex_init(&chip->mutex);
1179	init_waitqueue_head(&chip->wait);
1180	INIT_DELAYED_WORK(&chip->prox_work, bh1770_prox_work);
1181
1182	if (client->dev.platform_data == NULL) {
1183		dev_err(&client->dev, "platform data is mandatory\n");
1184		return -EINVAL;
1185	}
1186
1187	chip->pdata		= client->dev.platform_data;
1188	chip->lux_calib		= BH1770_LUX_NEUTRAL_CALIB_VALUE;
1189	chip->lux_rate_index	= BH1770_LUX_DEFAULT_RATE;
1190	chip->lux_threshold_lo	= BH1770_LUX_DEF_THRES;
1191	chip->lux_threshold_hi	= BH1770_LUX_DEF_THRES;
1192
1193	if (chip->pdata->glass_attenuation == 0)
1194		chip->lux_ga = BH1770_NEUTRAL_GA;
1195	else
1196		chip->lux_ga = chip->pdata->glass_attenuation;
1197
1198	chip->prox_threshold	= BH1770_PROX_DEF_THRES;
1199	chip->prox_led		= chip->pdata->led_def_curr;
1200	chip->prox_abs_thres	= BH1770_PROX_DEF_ABS_THRES;
1201	chip->prox_persistence	= BH1770_DEFAULT_PERSISTENCE;
1202	chip->prox_rate_threshold = BH1770_PROX_DEF_RATE_THRESH;
1203	chip->prox_rate		= BH1770_PROX_DEFAULT_RATE;
1204	chip->prox_data		= 0;
1205
1206	chip->regs[0].supply = reg_vcc;
1207	chip->regs[1].supply = reg_vleds;
1208
1209	err = devm_regulator_bulk_get(&client->dev,
1210				      ARRAY_SIZE(chip->regs), chip->regs);
1211	if (err < 0) {
1212		dev_err(&client->dev, "Cannot get regulators\n");
1213		return err;
1214	}
1215
1216	err = regulator_bulk_enable(ARRAY_SIZE(chip->regs),
1217				chip->regs);
1218	if (err < 0) {
1219		dev_err(&client->dev, "Cannot enable regulators\n");
1220		return err;
1221	}
1222
1223	usleep_range(BH1770_STARTUP_DELAY, BH1770_STARTUP_DELAY * 2);
1224	err = bh1770_detect(chip);
1225	if (err < 0)
1226		goto fail0;
1227
1228	/* Start chip */
1229	bh1770_chip_on(chip);
1230	pm_runtime_set_active(&client->dev);
1231	pm_runtime_enable(&client->dev);
1232
1233	chip->lux_corr = bh1770_get_corr_value(chip);
1234	if (chip->lux_corr == 0) {
1235		dev_err(&client->dev, "Improper correction values\n");
1236		err = -EINVAL;
1237		goto fail0;
1238	}
1239
1240	if (chip->pdata->setup_resources) {
1241		err = chip->pdata->setup_resources();
1242		if (err) {
1243			err = -EINVAL;
1244			goto fail0;
1245		}
1246	}
1247
1248	err = sysfs_create_group(&chip->client->dev.kobj,
1249				&bh1770_attribute_group);
1250	if (err < 0) {
1251		dev_err(&chip->client->dev, "Sysfs registration failed\n");
1252		goto fail1;
1253	}
1254
1255	/*
1256	 * Chip needs level triggered interrupt to work. However,
1257	 * level triggering doesn't work always correctly with power
1258	 * management. Select both
1259	 */
1260	err = request_threaded_irq(client->irq, NULL,
1261				bh1770_irq,
1262				IRQF_TRIGGER_FALLING | IRQF_ONESHOT |
1263				IRQF_TRIGGER_LOW,
1264				"bh1770", chip);
1265	if (err) {
1266		dev_err(&client->dev, "could not get IRQ %d\n",
1267			client->irq);
1268		goto fail2;
1269	}
1270	regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
1271	return err;
1272fail2:
1273	sysfs_remove_group(&chip->client->dev.kobj,
1274			&bh1770_attribute_group);
1275fail1:
1276	if (chip->pdata->release_resources)
1277		chip->pdata->release_resources();
1278fail0:
1279	regulator_bulk_disable(ARRAY_SIZE(chip->regs), chip->regs);
1280	return err;
1281}
1282
1283static int bh1770_remove(struct i2c_client *client)
1284{
1285	struct bh1770_chip *chip = i2c_get_clientdata(client);
1286
1287	free_irq(client->irq, chip);
1288
1289	sysfs_remove_group(&chip->client->dev.kobj,
1290			&bh1770_attribute_group);
1291
1292	if (chip->pdata->release_resources)
1293		chip->pdata->release_resources();
1294
1295	cancel_delayed_work_sync(&chip->prox_work);
1296
1297	if (!pm_runtime_suspended(&client->dev))
1298		bh1770_chip_off(chip);
1299
1300	pm_runtime_disable(&client->dev);
1301	pm_runtime_set_suspended(&client->dev);
1302
1303	return 0;
1304}
1305
1306#ifdef CONFIG_PM_SLEEP
1307static int bh1770_suspend(struct device *dev)
1308{
1309	struct i2c_client *client = to_i2c_client(dev);
1310	struct bh1770_chip *chip = i2c_get_clientdata(client);
1311
1312	bh1770_chip_off(chip);
1313
1314	return 0;
1315}
1316
1317static int bh1770_resume(struct device *dev)
1318{
1319	struct i2c_client *client = to_i2c_client(dev);
1320	struct bh1770_chip *chip = i2c_get_clientdata(client);
1321	int ret = 0;
1322
1323	bh1770_chip_on(chip);
1324
1325	if (!pm_runtime_suspended(dev)) {
1326		/*
1327		 * If we were enabled at suspend time, it is expected
1328		 * everything works nice and smoothly
1329		 */
1330		ret = bh1770_lux_rate(chip, chip->lux_rate_index);
1331		ret |= bh1770_lux_interrupt_control(chip, BH1770_ENABLE);
1332
1333		/* This causes interrupt after the next measurement cycle */
1334		bh1770_lux_update_thresholds(chip, BH1770_LUX_DEF_THRES,
1335					BH1770_LUX_DEF_THRES);
1336		/* Inform that we are waiting for a result from ALS */
1337		chip->lux_wait_result = true;
1338		bh1770_prox_mode_control(chip);
1339	}
1340	return ret;
1341}
1342#endif
1343
1344#ifdef CONFIG_PM
1345static int bh1770_runtime_suspend(struct device *dev)
1346{
1347	struct i2c_client *client = to_i2c_client(dev);
1348	struct bh1770_chip *chip = i2c_get_clientdata(client);
1349
1350	bh1770_chip_off(chip);
1351
1352	return 0;
1353}
1354
1355static int bh1770_runtime_resume(struct device *dev)
1356{
1357	struct i2c_client *client = to_i2c_client(dev);
1358	struct bh1770_chip *chip = i2c_get_clientdata(client);
1359
1360	bh1770_chip_on(chip);
1361
1362	return 0;
1363}
1364#endif
1365
1366static const struct i2c_device_id bh1770_id[] = {
1367	{"bh1770glc", 0 },
1368	{"sfh7770", 0 },
1369	{}
1370};
1371
1372MODULE_DEVICE_TABLE(i2c, bh1770_id);
1373
1374static const struct dev_pm_ops bh1770_pm_ops = {
1375	SET_SYSTEM_SLEEP_PM_OPS(bh1770_suspend, bh1770_resume)
1376	SET_RUNTIME_PM_OPS(bh1770_runtime_suspend, bh1770_runtime_resume, NULL)
1377};
1378
1379static struct i2c_driver bh1770_driver = {
1380	.driver	 = {
1381		.name	= "bh1770glc",
1382		.pm	= &bh1770_pm_ops,
1383	},
1384	.probe	  = bh1770_probe,
1385	.remove	  = bh1770_remove,
1386	.id_table = bh1770_id,
1387};
1388
1389module_i2c_driver(bh1770_driver);
1390
1391MODULE_DESCRIPTION("BH1770GLC / SFH7770 combined ALS and proximity sensor");
1392MODULE_AUTHOR("Samu Onkalo, Nokia Corporation");
1393MODULE_LICENSE("GPL v2");