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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Backlight driver for Analog Devices ADP8870 Backlight Devices4 *5 * Copyright 2009-2011 Analog Devices Inc.6 */7 8#include <linux/module.h>9#include <linux/init.h>10#include <linux/errno.h>11#include <linux/pm.h>12#include <linux/platform_device.h>13#include <linux/i2c.h>14#include <linux/fb.h>15#include <linux/backlight.h>16#include <linux/leds.h>17#include <linux/workqueue.h>18#include <linux/slab.h>19 20#include <linux/platform_data/adp8870.h>21#define ADP8870_EXT_FEATURES22#define ADP8870_USE_LEDS23 24 25#define ADP8870_MFDVID 0x00 /* Manufacturer and device ID */26#define ADP8870_MDCR 0x01 /* Device mode and status */27#define ADP8870_INT_STAT 0x02 /* Interrupts status */28#define ADP8870_INT_EN 0x03 /* Interrupts enable */29#define ADP8870_CFGR 0x04 /* Configuration register */30#define ADP8870_BLSEL 0x05 /* Sink enable backlight or independent */31#define ADP8870_PWMLED 0x06 /* PWM Enable Selection Register */32#define ADP8870_BLOFF 0x07 /* Backlight off timeout */33#define ADP8870_BLDIM 0x08 /* Backlight dim timeout */34#define ADP8870_BLFR 0x09 /* Backlight fade in and out rates */35#define ADP8870_BLMX1 0x0A /* Backlight (Brightness Level 1-daylight) maximum current */36#define ADP8870_BLDM1 0x0B /* Backlight (Brightness Level 1-daylight) dim current */37#define ADP8870_BLMX2 0x0C /* Backlight (Brightness Level 2-bright) maximum current */38#define ADP8870_BLDM2 0x0D /* Backlight (Brightness Level 2-bright) dim current */39#define ADP8870_BLMX3 0x0E /* Backlight (Brightness Level 3-office) maximum current */40#define ADP8870_BLDM3 0x0F /* Backlight (Brightness Level 3-office) dim current */41#define ADP8870_BLMX4 0x10 /* Backlight (Brightness Level 4-indoor) maximum current */42#define ADP8870_BLDM4 0x11 /* Backlight (Brightness Level 4-indoor) dim current */43#define ADP8870_BLMX5 0x12 /* Backlight (Brightness Level 5-dark) maximum current */44#define ADP8870_BLDM5 0x13 /* Backlight (Brightness Level 5-dark) dim current */45#define ADP8870_ISCLAW 0x1A /* Independent sink current fade law register */46#define ADP8870_ISCC 0x1B /* Independent sink current control register */47#define ADP8870_ISCT1 0x1C /* Independent Sink Current Timer Register LED[7:5] */48#define ADP8870_ISCT2 0x1D /* Independent Sink Current Timer Register LED[4:1] */49#define ADP8870_ISCF 0x1E /* Independent sink current fade register */50#define ADP8870_ISC1 0x1F /* Independent Sink Current LED1 */51#define ADP8870_ISC2 0x20 /* Independent Sink Current LED2 */52#define ADP8870_ISC3 0x21 /* Independent Sink Current LED3 */53#define ADP8870_ISC4 0x22 /* Independent Sink Current LED4 */54#define ADP8870_ISC5 0x23 /* Independent Sink Current LED5 */55#define ADP8870_ISC6 0x24 /* Independent Sink Current LED6 */56#define ADP8870_ISC7 0x25 /* Independent Sink Current LED7 (Brightness Level 1-daylight) */57#define ADP8870_ISC7_L2 0x26 /* Independent Sink Current LED7 (Brightness Level 2-bright) */58#define ADP8870_ISC7_L3 0x27 /* Independent Sink Current LED7 (Brightness Level 3-office) */59#define ADP8870_ISC7_L4 0x28 /* Independent Sink Current LED7 (Brightness Level 4-indoor) */60#define ADP8870_ISC7_L5 0x29 /* Independent Sink Current LED7 (Brightness Level 5-dark) */61#define ADP8870_CMP_CTL 0x2D /* ALS Comparator Control Register */62#define ADP8870_ALS1_EN 0x2E /* Main ALS comparator level enable */63#define ADP8870_ALS2_EN 0x2F /* Second ALS comparator level enable */64#define ADP8870_ALS1_STAT 0x30 /* Main ALS Comparator Status Register */65#define ADP8870_ALS2_STAT 0x31 /* Second ALS Comparator Status Register */66#define ADP8870_L2TRP 0x32 /* L2 comparator reference */67#define ADP8870_L2HYS 0x33 /* L2 hysteresis */68#define ADP8870_L3TRP 0x34 /* L3 comparator reference */69#define ADP8870_L3HYS 0x35 /* L3 hysteresis */70#define ADP8870_L4TRP 0x36 /* L4 comparator reference */71#define ADP8870_L4HYS 0x37 /* L4 hysteresis */72#define ADP8870_L5TRP 0x38 /* L5 comparator reference */73#define ADP8870_L5HYS 0x39 /* L5 hysteresis */74#define ADP8870_PH1LEVL 0x40 /* First phototransistor ambient light level-low byte register */75#define ADP8870_PH1LEVH 0x41 /* First phototransistor ambient light level-high byte register */76#define ADP8870_PH2LEVL 0x42 /* Second phototransistor ambient light level-low byte register */77#define ADP8870_PH2LEVH 0x43 /* Second phototransistor ambient light level-high byte register */78 79#define ADP8870_MANUFID 0x3 /* Analog Devices AD8870 Manufacturer and device ID */80#define ADP8870_DEVID(x) ((x) & 0xF)81#define ADP8870_MANID(x) ((x) >> 4)82 83/* MDCR Device mode and status */84#define D7ALSEN (1 << 7)85#define INT_CFG (1 << 6)86#define NSTBY (1 << 5)87#define DIM_EN (1 << 4)88#define GDWN_DIS (1 << 3)89#define SIS_EN (1 << 2)90#define CMP_AUTOEN (1 << 1)91#define BLEN (1 << 0)92 93/* ADP8870_ALS1_EN Main ALS comparator level enable */94#define L5_EN (1 << 3)95#define L4_EN (1 << 2)96#define L3_EN (1 << 1)97#define L2_EN (1 << 0)98 99#define CFGR_BLV_SHIFT 3100#define CFGR_BLV_MASK 0x7101#define ADP8870_FLAG_LED_MASK 0xFF102 103#define FADE_VAL(in, out) ((0xF & (in)) | ((0xF & (out)) << 4))104#define BL_CFGR_VAL(law, blv) ((((blv) & CFGR_BLV_MASK) << CFGR_BLV_SHIFT) | ((0x3 & (law)) << 1))105#define ALS_CMPR_CFG_VAL(filt) ((0x7 & (filt)) << 1)106 107struct adp8870_bl {108 struct i2c_client *client;109 struct backlight_device *bl;110 struct adp8870_led *led;111 struct adp8870_backlight_platform_data *pdata;112 struct mutex lock;113 unsigned long cached_daylight_max;114 int id;115 int revid;116 int current_brightness;117};118 119struct adp8870_led {120 struct led_classdev cdev;121 struct work_struct work;122 struct i2c_client *client;123 enum led_brightness new_brightness;124 int id;125 int flags;126};127 128static int adp8870_read(struct i2c_client *client, int reg, uint8_t *val)129{130 int ret;131 132 ret = i2c_smbus_read_byte_data(client, reg);133 if (ret < 0) {134 dev_err(&client->dev, "failed reading at 0x%02x\n", reg);135 return ret;136 }137 138 *val = ret;139 return 0;140}141 142 143static int adp8870_write(struct i2c_client *client, u8 reg, u8 val)144{145 int ret = i2c_smbus_write_byte_data(client, reg, val);146 147 if (ret)148 dev_err(&client->dev, "failed to write\n");149 150 return ret;151}152 153static int adp8870_set_bits(struct i2c_client *client, int reg, uint8_t bit_mask)154{155 struct adp8870_bl *data = i2c_get_clientdata(client);156 uint8_t reg_val;157 int ret;158 159 mutex_lock(&data->lock);160 161 ret = adp8870_read(client, reg, ®_val);162 163 if (!ret && ((reg_val & bit_mask) != bit_mask)) {164 reg_val |= bit_mask;165 ret = adp8870_write(client, reg, reg_val);166 }167 168 mutex_unlock(&data->lock);169 return ret;170}171 172static int adp8870_clr_bits(struct i2c_client *client, int reg, uint8_t bit_mask)173{174 struct adp8870_bl *data = i2c_get_clientdata(client);175 uint8_t reg_val;176 int ret;177 178 mutex_lock(&data->lock);179 180 ret = adp8870_read(client, reg, ®_val);181 182 if (!ret && (reg_val & bit_mask)) {183 reg_val &= ~bit_mask;184 ret = adp8870_write(client, reg, reg_val);185 }186 187 mutex_unlock(&data->lock);188 return ret;189}190 191/*192 * Independent sink / LED193 */194#if defined(ADP8870_USE_LEDS)195static void adp8870_led_work(struct work_struct *work)196{197 struct adp8870_led *led = container_of(work, struct adp8870_led, work);198 199 adp8870_write(led->client, ADP8870_ISC1 + led->id - 1,200 led->new_brightness >> 1);201}202 203static void adp8870_led_set(struct led_classdev *led_cdev,204 enum led_brightness value)205{206 struct adp8870_led *led;207 208 led = container_of(led_cdev, struct adp8870_led, cdev);209 led->new_brightness = value;210 /*211 * Use workqueue for IO since I2C operations can sleep.212 */213 schedule_work(&led->work);214}215 216static int adp8870_led_setup(struct adp8870_led *led)217{218 struct i2c_client *client = led->client;219 int ret = 0;220 221 ret = adp8870_write(client, ADP8870_ISC1 + led->id - 1, 0);222 if (ret)223 return ret;224 225 ret = adp8870_set_bits(client, ADP8870_ISCC, 1 << (led->id - 1));226 if (ret)227 return ret;228 229 if (led->id > 4)230 ret = adp8870_set_bits(client, ADP8870_ISCT1,231 (led->flags & 0x3) << ((led->id - 5) * 2));232 else233 ret = adp8870_set_bits(client, ADP8870_ISCT2,234 (led->flags & 0x3) << ((led->id - 1) * 2));235 236 return ret;237}238 239static int adp8870_led_probe(struct i2c_client *client)240{241 struct adp8870_backlight_platform_data *pdata =242 dev_get_platdata(&client->dev);243 struct adp8870_bl *data = i2c_get_clientdata(client);244 struct adp8870_led *led, *led_dat;245 struct led_info *cur_led;246 int ret, i;247 248 led = devm_kcalloc(&client->dev, pdata->num_leds, sizeof(*led),249 GFP_KERNEL);250 if (led == NULL)251 return -ENOMEM;252 253 ret = adp8870_write(client, ADP8870_ISCLAW, pdata->led_fade_law);254 if (ret)255 return ret;256 257 ret = adp8870_write(client, ADP8870_ISCT1,258 (pdata->led_on_time & 0x3) << 6);259 if (ret)260 return ret;261 262 ret = adp8870_write(client, ADP8870_ISCF,263 FADE_VAL(pdata->led_fade_in, pdata->led_fade_out));264 if (ret)265 return ret;266 267 for (i = 0; i < pdata->num_leds; ++i) {268 cur_led = &pdata->leds[i];269 led_dat = &led[i];270 271 led_dat->id = cur_led->flags & ADP8870_FLAG_LED_MASK;272 273 if (led_dat->id > 7 || led_dat->id < 1) {274 dev_err(&client->dev, "Invalid LED ID %d\n",275 led_dat->id);276 ret = -EINVAL;277 goto err;278 }279 280 if (pdata->bl_led_assign & (1 << (led_dat->id - 1))) {281 dev_err(&client->dev, "LED %d used by Backlight\n",282 led_dat->id);283 ret = -EBUSY;284 goto err;285 }286 287 led_dat->cdev.name = cur_led->name;288 led_dat->cdev.default_trigger = cur_led->default_trigger;289 led_dat->cdev.brightness_set = adp8870_led_set;290 led_dat->cdev.brightness = LED_OFF;291 led_dat->flags = cur_led->flags >> FLAG_OFFT_SHIFT;292 led_dat->client = client;293 led_dat->new_brightness = LED_OFF;294 INIT_WORK(&led_dat->work, adp8870_led_work);295 296 ret = led_classdev_register(&client->dev, &led_dat->cdev);297 if (ret) {298 dev_err(&client->dev, "failed to register LED %d\n",299 led_dat->id);300 goto err;301 }302 303 ret = adp8870_led_setup(led_dat);304 if (ret) {305 dev_err(&client->dev, "failed to write\n");306 i++;307 goto err;308 }309 }310 311 data->led = led;312 313 return 0;314 315 err:316 for (i = i - 1; i >= 0; --i) {317 led_classdev_unregister(&led[i].cdev);318 cancel_work_sync(&led[i].work);319 }320 321 return ret;322}323 324static int adp8870_led_remove(struct i2c_client *client)325{326 struct adp8870_backlight_platform_data *pdata =327 dev_get_platdata(&client->dev);328 struct adp8870_bl *data = i2c_get_clientdata(client);329 int i;330 331 for (i = 0; i < pdata->num_leds; i++) {332 led_classdev_unregister(&data->led[i].cdev);333 cancel_work_sync(&data->led[i].work);334 }335 336 return 0;337}338#else339static int adp8870_led_probe(struct i2c_client *client)340{341 return 0;342}343 344static int adp8870_led_remove(struct i2c_client *client)345{346 return 0;347}348#endif349 350static int adp8870_bl_set(struct backlight_device *bl, int brightness)351{352 struct adp8870_bl *data = bl_get_data(bl);353 struct i2c_client *client = data->client;354 int ret = 0;355 356 if (data->pdata->en_ambl_sens) {357 if ((brightness > 0) && (brightness < ADP8870_MAX_BRIGHTNESS)) {358 /* Disable Ambient Light auto adjust */359 ret = adp8870_clr_bits(client, ADP8870_MDCR,360 CMP_AUTOEN);361 if (ret)362 return ret;363 ret = adp8870_write(client, ADP8870_BLMX1, brightness);364 if (ret)365 return ret;366 } else {367 /*368 * MAX_BRIGHTNESS -> Enable Ambient Light auto adjust369 * restore daylight l1 sysfs brightness370 */371 ret = adp8870_write(client, ADP8870_BLMX1,372 data->cached_daylight_max);373 if (ret)374 return ret;375 376 ret = adp8870_set_bits(client, ADP8870_MDCR,377 CMP_AUTOEN);378 if (ret)379 return ret;380 }381 } else {382 ret = adp8870_write(client, ADP8870_BLMX1, brightness);383 if (ret)384 return ret;385 }386 387 if (data->current_brightness && brightness == 0)388 ret = adp8870_set_bits(client,389 ADP8870_MDCR, DIM_EN);390 else if (data->current_brightness == 0 && brightness)391 ret = adp8870_clr_bits(client,392 ADP8870_MDCR, DIM_EN);393 394 if (!ret)395 data->current_brightness = brightness;396 397 return ret;398}399 400static int adp8870_bl_update_status(struct backlight_device *bl)401{402 return adp8870_bl_set(bl, backlight_get_brightness(bl));403}404 405static int adp8870_bl_get_brightness(struct backlight_device *bl)406{407 struct adp8870_bl *data = bl_get_data(bl);408 409 return data->current_brightness;410}411 412static const struct backlight_ops adp8870_bl_ops = {413 .update_status = adp8870_bl_update_status,414 .get_brightness = adp8870_bl_get_brightness,415};416 417static int adp8870_bl_setup(struct backlight_device *bl)418{419 struct adp8870_bl *data = bl_get_data(bl);420 struct i2c_client *client = data->client;421 struct adp8870_backlight_platform_data *pdata = data->pdata;422 int ret = 0;423 424 ret = adp8870_write(client, ADP8870_BLSEL, ~pdata->bl_led_assign);425 if (ret)426 return ret;427 428 ret = adp8870_write(client, ADP8870_PWMLED, pdata->pwm_assign);429 if (ret)430 return ret;431 432 ret = adp8870_write(client, ADP8870_BLMX1, pdata->l1_daylight_max);433 if (ret)434 return ret;435 436 ret = adp8870_write(client, ADP8870_BLDM1, pdata->l1_daylight_dim);437 if (ret)438 return ret;439 440 if (pdata->en_ambl_sens) {441 data->cached_daylight_max = pdata->l1_daylight_max;442 ret = adp8870_write(client, ADP8870_BLMX2,443 pdata->l2_bright_max);444 if (ret)445 return ret;446 ret = adp8870_write(client, ADP8870_BLDM2,447 pdata->l2_bright_dim);448 if (ret)449 return ret;450 451 ret = adp8870_write(client, ADP8870_BLMX3,452 pdata->l3_office_max);453 if (ret)454 return ret;455 ret = adp8870_write(client, ADP8870_BLDM3,456 pdata->l3_office_dim);457 if (ret)458 return ret;459 460 ret = adp8870_write(client, ADP8870_BLMX4,461 pdata->l4_indoor_max);462 if (ret)463 return ret;464 465 ret = adp8870_write(client, ADP8870_BLDM4,466 pdata->l4_indor_dim);467 if (ret)468 return ret;469 470 ret = adp8870_write(client, ADP8870_BLMX5,471 pdata->l5_dark_max);472 if (ret)473 return ret;474 475 ret = adp8870_write(client, ADP8870_BLDM5,476 pdata->l5_dark_dim);477 if (ret)478 return ret;479 480 ret = adp8870_write(client, ADP8870_L2TRP, pdata->l2_trip);481 if (ret)482 return ret;483 484 ret = adp8870_write(client, ADP8870_L2HYS, pdata->l2_hyst);485 if (ret)486 return ret;487 488 ret = adp8870_write(client, ADP8870_L3TRP, pdata->l3_trip);489 if (ret)490 return ret;491 492 ret = adp8870_write(client, ADP8870_L3HYS, pdata->l3_hyst);493 if (ret)494 return ret;495 496 ret = adp8870_write(client, ADP8870_L4TRP, pdata->l4_trip);497 if (ret)498 return ret;499 500 ret = adp8870_write(client, ADP8870_L4HYS, pdata->l4_hyst);501 if (ret)502 return ret;503 504 ret = adp8870_write(client, ADP8870_L5TRP, pdata->l5_trip);505 if (ret)506 return ret;507 508 ret = adp8870_write(client, ADP8870_L5HYS, pdata->l5_hyst);509 if (ret)510 return ret;511 512 ret = adp8870_write(client, ADP8870_ALS1_EN, L5_EN | L4_EN |513 L3_EN | L2_EN);514 if (ret)515 return ret;516 517 ret = adp8870_write(client, ADP8870_CMP_CTL,518 ALS_CMPR_CFG_VAL(pdata->abml_filt));519 if (ret)520 return ret;521 }522 523 ret = adp8870_write(client, ADP8870_CFGR,524 BL_CFGR_VAL(pdata->bl_fade_law, 0));525 if (ret)526 return ret;527 528 ret = adp8870_write(client, ADP8870_BLFR, FADE_VAL(pdata->bl_fade_in,529 pdata->bl_fade_out));530 if (ret)531 return ret;532 /*533 * ADP8870 Rev0 requires GDWN_DIS bit set534 */535 536 ret = adp8870_set_bits(client, ADP8870_MDCR, BLEN | DIM_EN | NSTBY |537 (data->revid == 0 ? GDWN_DIS : 0));538 539 return ret;540}541 542static ssize_t adp8870_show(struct device *dev, char *buf, int reg)543{544 struct adp8870_bl *data = dev_get_drvdata(dev);545 int error;546 uint8_t reg_val;547 548 mutex_lock(&data->lock);549 error = adp8870_read(data->client, reg, ®_val);550 mutex_unlock(&data->lock);551 552 if (error < 0)553 return error;554 555 return sprintf(buf, "%u\n", reg_val);556}557 558static ssize_t adp8870_store(struct device *dev, const char *buf,559 size_t count, int reg)560{561 struct adp8870_bl *data = dev_get_drvdata(dev);562 unsigned long val;563 int ret;564 565 ret = kstrtoul(buf, 10, &val);566 if (ret)567 return ret;568 569 mutex_lock(&data->lock);570 adp8870_write(data->client, reg, val);571 mutex_unlock(&data->lock);572 573 return count;574}575 576static ssize_t adp8870_bl_l5_dark_max_show(struct device *dev,577 struct device_attribute *attr, char *buf)578{579 return adp8870_show(dev, buf, ADP8870_BLMX5);580}581 582static ssize_t adp8870_bl_l5_dark_max_store(struct device *dev,583 struct device_attribute *attr, const char *buf, size_t count)584{585 return adp8870_store(dev, buf, count, ADP8870_BLMX5);586}587static DEVICE_ATTR(l5_dark_max, 0664, adp8870_bl_l5_dark_max_show,588 adp8870_bl_l5_dark_max_store);589 590 591static ssize_t adp8870_bl_l4_indoor_max_show(struct device *dev,592 struct device_attribute *attr, char *buf)593{594 return adp8870_show(dev, buf, ADP8870_BLMX4);595}596 597static ssize_t adp8870_bl_l4_indoor_max_store(struct device *dev,598 struct device_attribute *attr, const char *buf, size_t count)599{600 return adp8870_store(dev, buf, count, ADP8870_BLMX4);601}602static DEVICE_ATTR(l4_indoor_max, 0664, adp8870_bl_l4_indoor_max_show,603 adp8870_bl_l4_indoor_max_store);604 605 606static ssize_t adp8870_bl_l3_office_max_show(struct device *dev,607 struct device_attribute *attr, char *buf)608{609 return adp8870_show(dev, buf, ADP8870_BLMX3);610}611 612static ssize_t adp8870_bl_l3_office_max_store(struct device *dev,613 struct device_attribute *attr, const char *buf, size_t count)614{615 return adp8870_store(dev, buf, count, ADP8870_BLMX3);616}617 618static DEVICE_ATTR(l3_office_max, 0664, adp8870_bl_l3_office_max_show,619 adp8870_bl_l3_office_max_store);620 621static ssize_t adp8870_bl_l2_bright_max_show(struct device *dev,622 struct device_attribute *attr, char *buf)623{624 return adp8870_show(dev, buf, ADP8870_BLMX2);625}626 627static ssize_t adp8870_bl_l2_bright_max_store(struct device *dev,628 struct device_attribute *attr, const char *buf, size_t count)629{630 return adp8870_store(dev, buf, count, ADP8870_BLMX2);631}632static DEVICE_ATTR(l2_bright_max, 0664, adp8870_bl_l2_bright_max_show,633 adp8870_bl_l2_bright_max_store);634 635static ssize_t adp8870_bl_l1_daylight_max_show(struct device *dev,636 struct device_attribute *attr, char *buf)637{638 return adp8870_show(dev, buf, ADP8870_BLMX1);639}640 641static ssize_t adp8870_bl_l1_daylight_max_store(struct device *dev,642 struct device_attribute *attr, const char *buf, size_t count)643{644 struct adp8870_bl *data = dev_get_drvdata(dev);645 int ret = kstrtoul(buf, 10, &data->cached_daylight_max);646 647 if (ret)648 return ret;649 650 return adp8870_store(dev, buf, count, ADP8870_BLMX1);651}652static DEVICE_ATTR(l1_daylight_max, 0664, adp8870_bl_l1_daylight_max_show,653 adp8870_bl_l1_daylight_max_store);654 655static ssize_t adp8870_bl_l5_dark_dim_show(struct device *dev,656 struct device_attribute *attr, char *buf)657{658 return adp8870_show(dev, buf, ADP8870_BLDM5);659}660 661static ssize_t adp8870_bl_l5_dark_dim_store(struct device *dev,662 struct device_attribute *attr,663 const char *buf, size_t count)664{665 return adp8870_store(dev, buf, count, ADP8870_BLDM5);666}667static DEVICE_ATTR(l5_dark_dim, 0664, adp8870_bl_l5_dark_dim_show,668 adp8870_bl_l5_dark_dim_store);669 670static ssize_t adp8870_bl_l4_indoor_dim_show(struct device *dev,671 struct device_attribute *attr, char *buf)672{673 return adp8870_show(dev, buf, ADP8870_BLDM4);674}675 676static ssize_t adp8870_bl_l4_indoor_dim_store(struct device *dev,677 struct device_attribute *attr,678 const char *buf, size_t count)679{680 return adp8870_store(dev, buf, count, ADP8870_BLDM4);681}682static DEVICE_ATTR(l4_indoor_dim, 0664, adp8870_bl_l4_indoor_dim_show,683 adp8870_bl_l4_indoor_dim_store);684 685 686static ssize_t adp8870_bl_l3_office_dim_show(struct device *dev,687 struct device_attribute *attr, char *buf)688{689 return adp8870_show(dev, buf, ADP8870_BLDM3);690}691 692static ssize_t adp8870_bl_l3_office_dim_store(struct device *dev,693 struct device_attribute *attr,694 const char *buf, size_t count)695{696 return adp8870_store(dev, buf, count, ADP8870_BLDM3);697}698static DEVICE_ATTR(l3_office_dim, 0664, adp8870_bl_l3_office_dim_show,699 adp8870_bl_l3_office_dim_store);700 701static ssize_t adp8870_bl_l2_bright_dim_show(struct device *dev,702 struct device_attribute *attr, char *buf)703{704 return adp8870_show(dev, buf, ADP8870_BLDM2);705}706 707static ssize_t adp8870_bl_l2_bright_dim_store(struct device *dev,708 struct device_attribute *attr,709 const char *buf, size_t count)710{711 return adp8870_store(dev, buf, count, ADP8870_BLDM2);712}713static DEVICE_ATTR(l2_bright_dim, 0664, adp8870_bl_l2_bright_dim_show,714 adp8870_bl_l2_bright_dim_store);715 716static ssize_t adp8870_bl_l1_daylight_dim_show(struct device *dev,717 struct device_attribute *attr, char *buf)718{719 return adp8870_show(dev, buf, ADP8870_BLDM1);720}721 722static ssize_t adp8870_bl_l1_daylight_dim_store(struct device *dev,723 struct device_attribute *attr,724 const char *buf, size_t count)725{726 return adp8870_store(dev, buf, count, ADP8870_BLDM1);727}728static DEVICE_ATTR(l1_daylight_dim, 0664, adp8870_bl_l1_daylight_dim_show,729 adp8870_bl_l1_daylight_dim_store);730 731#ifdef ADP8870_EXT_FEATURES732static ssize_t adp8870_bl_ambient_light_level_show(struct device *dev,733 struct device_attribute *attr, char *buf)734{735 struct adp8870_bl *data = dev_get_drvdata(dev);736 int error;737 uint8_t reg_val;738 uint16_t ret_val;739 740 mutex_lock(&data->lock);741 error = adp8870_read(data->client, ADP8870_PH1LEVL, ®_val);742 if (error < 0) {743 mutex_unlock(&data->lock);744 return error;745 }746 ret_val = reg_val;747 error = adp8870_read(data->client, ADP8870_PH1LEVH, ®_val);748 mutex_unlock(&data->lock);749 750 if (error < 0)751 return error;752 753 /* Return 13-bit conversion value for the first light sensor */754 ret_val += (reg_val & 0x1F) << 8;755 756 return sprintf(buf, "%u\n", ret_val);757}758static DEVICE_ATTR(ambient_light_level, 0444,759 adp8870_bl_ambient_light_level_show, NULL);760 761static ssize_t adp8870_bl_ambient_light_zone_show(struct device *dev,762 struct device_attribute *attr, char *buf)763{764 struct adp8870_bl *data = dev_get_drvdata(dev);765 int error;766 uint8_t reg_val;767 768 mutex_lock(&data->lock);769 error = adp8870_read(data->client, ADP8870_CFGR, ®_val);770 mutex_unlock(&data->lock);771 772 if (error < 0)773 return error;774 775 return sprintf(buf, "%u\n",776 ((reg_val >> CFGR_BLV_SHIFT) & CFGR_BLV_MASK) + 1);777}778 779static ssize_t adp8870_bl_ambient_light_zone_store(struct device *dev,780 struct device_attribute *attr,781 const char *buf, size_t count)782{783 struct adp8870_bl *data = dev_get_drvdata(dev);784 unsigned long val;785 uint8_t reg_val;786 int ret;787 788 ret = kstrtoul(buf, 10, &val);789 if (ret)790 return ret;791 792 if (val == 0) {793 /* Enable automatic ambient light sensing */794 adp8870_set_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);795 } else if ((val > 0) && (val < 6)) {796 /* Disable automatic ambient light sensing */797 adp8870_clr_bits(data->client, ADP8870_MDCR, CMP_AUTOEN);798 799 /* Set user supplied ambient light zone */800 mutex_lock(&data->lock);801 ret = adp8870_read(data->client, ADP8870_CFGR, ®_val);802 if (!ret) {803 reg_val &= ~(CFGR_BLV_MASK << CFGR_BLV_SHIFT);804 reg_val |= (val - 1) << CFGR_BLV_SHIFT;805 adp8870_write(data->client, ADP8870_CFGR, reg_val);806 }807 mutex_unlock(&data->lock);808 }809 810 return count;811}812static DEVICE_ATTR(ambient_light_zone, 0664,813 adp8870_bl_ambient_light_zone_show,814 adp8870_bl_ambient_light_zone_store);815#endif816 817static struct attribute *adp8870_bl_attributes[] = {818 &dev_attr_l5_dark_max.attr,819 &dev_attr_l5_dark_dim.attr,820 &dev_attr_l4_indoor_max.attr,821 &dev_attr_l4_indoor_dim.attr,822 &dev_attr_l3_office_max.attr,823 &dev_attr_l3_office_dim.attr,824 &dev_attr_l2_bright_max.attr,825 &dev_attr_l2_bright_dim.attr,826 &dev_attr_l1_daylight_max.attr,827 &dev_attr_l1_daylight_dim.attr,828#ifdef ADP8870_EXT_FEATURES829 &dev_attr_ambient_light_level.attr,830 &dev_attr_ambient_light_zone.attr,831#endif832 NULL833};834 835static const struct attribute_group adp8870_bl_attr_group = {836 .attrs = adp8870_bl_attributes,837};838 839static int adp8870_probe(struct i2c_client *client)840{841 const struct i2c_device_id *id = i2c_client_get_device_id(client);842 struct backlight_properties props;843 struct backlight_device *bl;844 struct adp8870_bl *data;845 struct adp8870_backlight_platform_data *pdata =846 dev_get_platdata(&client->dev);847 uint8_t reg_val;848 int ret;849 850 if (!i2c_check_functionality(client->adapter,851 I2C_FUNC_SMBUS_BYTE_DATA)) {852 dev_err(&client->dev, "SMBUS Byte Data not Supported\n");853 return -EIO;854 }855 856 if (!pdata) {857 dev_err(&client->dev, "no platform data?\n");858 return -EINVAL;859 }860 861 ret = adp8870_read(client, ADP8870_MFDVID, ®_val);862 if (ret < 0)863 return -EIO;864 865 if (ADP8870_MANID(reg_val) != ADP8870_MANUFID) {866 dev_err(&client->dev, "failed to probe\n");867 return -ENODEV;868 }869 870 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);871 if (data == NULL)872 return -ENOMEM;873 874 data->revid = ADP8870_DEVID(reg_val);875 data->client = client;876 data->pdata = pdata;877 data->id = id->driver_data;878 data->current_brightness = 0;879 i2c_set_clientdata(client, data);880 881 mutex_init(&data->lock);882 883 memset(&props, 0, sizeof(props));884 props.type = BACKLIGHT_RAW;885 props.max_brightness = props.brightness = ADP8870_MAX_BRIGHTNESS;886 bl = devm_backlight_device_register(&client->dev,887 dev_driver_string(&client->dev),888 &client->dev, data, &adp8870_bl_ops, &props);889 if (IS_ERR(bl)) {890 dev_err(&client->dev, "failed to register backlight\n");891 return PTR_ERR(bl);892 }893 894 data->bl = bl;895 896 if (pdata->en_ambl_sens) {897 ret = sysfs_create_group(&bl->dev.kobj,898 &adp8870_bl_attr_group);899 if (ret) {900 dev_err(&client->dev, "failed to register sysfs\n");901 return ret;902 }903 }904 905 ret = adp8870_bl_setup(bl);906 if (ret) {907 ret = -EIO;908 goto out;909 }910 911 backlight_update_status(bl);912 913 dev_info(&client->dev, "Rev.%d Backlight\n", data->revid);914 915 if (pdata->num_leds)916 adp8870_led_probe(client);917 918 return 0;919 920out:921 if (data->pdata->en_ambl_sens)922 sysfs_remove_group(&data->bl->dev.kobj,923 &adp8870_bl_attr_group);924 925 return ret;926}927 928static void adp8870_remove(struct i2c_client *client)929{930 struct adp8870_bl *data = i2c_get_clientdata(client);931 932 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY);933 934 if (data->led)935 adp8870_led_remove(client);936 937 if (data->pdata->en_ambl_sens)938 sysfs_remove_group(&data->bl->dev.kobj,939 &adp8870_bl_attr_group);940}941 942#ifdef CONFIG_PM_SLEEP943static int adp8870_i2c_suspend(struct device *dev)944{945 struct i2c_client *client = to_i2c_client(dev);946 947 adp8870_clr_bits(client, ADP8870_MDCR, NSTBY);948 949 return 0;950}951 952static int adp8870_i2c_resume(struct device *dev)953{954 struct i2c_client *client = to_i2c_client(dev);955 956 adp8870_set_bits(client, ADP8870_MDCR, NSTBY | BLEN);957 958 return 0;959}960#endif961 962static SIMPLE_DEV_PM_OPS(adp8870_i2c_pm_ops, adp8870_i2c_suspend,963 adp8870_i2c_resume);964 965static const struct i2c_device_id adp8870_id[] = {966 { "adp8870" },967 { }968};969MODULE_DEVICE_TABLE(i2c, adp8870_id);970 971static struct i2c_driver adp8870_driver = {972 .driver = {973 .name = KBUILD_MODNAME,974 .pm = &adp8870_i2c_pm_ops,975 },976 .probe = adp8870_probe,977 .remove = adp8870_remove,978 .id_table = adp8870_id,979};980 981module_i2c_driver(adp8870_driver);982 983MODULE_LICENSE("GPL v2");984MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");985MODULE_DESCRIPTION("ADP8870 Backlight driver");986