12e914516SFlavio Suligoi // SPDX-License-Identifier: GPL-2.0-or-later
22e914516SFlavio Suligoi /*
32e914516SFlavio Suligoi * Driver for MPS MP3309C White LED driver with I2C interface
42e914516SFlavio Suligoi *
52e914516SFlavio Suligoi * This driver support both analog (by I2C commands) and PWM dimming control
62e914516SFlavio Suligoi * modes.
72e914516SFlavio Suligoi *
82e914516SFlavio Suligoi * Copyright (C) 2023 ASEM Srl
92e914516SFlavio Suligoi * Author: Flavio Suligoi <f.suligoi@asem.it>
102e914516SFlavio Suligoi *
112e914516SFlavio Suligoi * Based on pwm_bl.c
122e914516SFlavio Suligoi */
132e914516SFlavio Suligoi
142e914516SFlavio Suligoi #include <linux/backlight.h>
152e914516SFlavio Suligoi #include <linux/delay.h>
162e914516SFlavio Suligoi #include <linux/gpio/consumer.h>
172e914516SFlavio Suligoi #include <linux/i2c.h>
18b54c828bSAndy Shevchenko #include <linux/mod_devicetable.h>
19b54c828bSAndy Shevchenko #include <linux/property.h>
202e914516SFlavio Suligoi #include <linux/pwm.h>
212e914516SFlavio Suligoi #include <linux/regmap.h>
222e914516SFlavio Suligoi
232e914516SFlavio Suligoi #define REG_I2C_0 0x00
242e914516SFlavio Suligoi #define REG_I2C_1 0x01
252e914516SFlavio Suligoi
262e914516SFlavio Suligoi #define REG_I2C_0_EN 0x80
272e914516SFlavio Suligoi #define REG_I2C_0_D0 0x40
282e914516SFlavio Suligoi #define REG_I2C_0_D1 0x20
292e914516SFlavio Suligoi #define REG_I2C_0_D2 0x10
302e914516SFlavio Suligoi #define REG_I2C_0_D3 0x08
312e914516SFlavio Suligoi #define REG_I2C_0_D4 0x04
322e914516SFlavio Suligoi #define REG_I2C_0_RSRV1 0x02
332e914516SFlavio Suligoi #define REG_I2C_0_RSRV2 0x01
342e914516SFlavio Suligoi
352e914516SFlavio Suligoi #define REG_I2C_1_RSRV1 0x80
362e914516SFlavio Suligoi #define REG_I2C_1_DIMS 0x40
372e914516SFlavio Suligoi #define REG_I2C_1_SYNC 0x20
382e914516SFlavio Suligoi #define REG_I2C_1_OVP0 0x10
392e914516SFlavio Suligoi #define REG_I2C_1_OVP1 0x08
402e914516SFlavio Suligoi #define REG_I2C_1_VOS 0x04
412e914516SFlavio Suligoi #define REG_I2C_1_LEDO 0x02
422e914516SFlavio Suligoi #define REG_I2C_1_OTP 0x01
432e914516SFlavio Suligoi
442e914516SFlavio Suligoi #define ANALOG_I2C_NUM_LEVELS 32 /* 0..31 */
452e914516SFlavio Suligoi #define ANALOG_I2C_REG_MASK 0x7c
462e914516SFlavio Suligoi
472e914516SFlavio Suligoi #define MP3309C_PWM_DEFAULT_NUM_LEVELS 256 /* 0..255 */
482e914516SFlavio Suligoi
492e914516SFlavio Suligoi enum mp3309c_status_value {
502e914516SFlavio Suligoi FIRST_POWER_ON,
512e914516SFlavio Suligoi BACKLIGHT_OFF,
522e914516SFlavio Suligoi BACKLIGHT_ON,
532e914516SFlavio Suligoi };
542e914516SFlavio Suligoi
552e914516SFlavio Suligoi enum mp3309c_dimming_mode_value {
562e914516SFlavio Suligoi DIMMING_PWM,
572e914516SFlavio Suligoi DIMMING_ANALOG_I2C,
582e914516SFlavio Suligoi };
592e914516SFlavio Suligoi
602e914516SFlavio Suligoi struct mp3309c_platform_data {
612e914516SFlavio Suligoi unsigned int max_brightness;
622e914516SFlavio Suligoi unsigned int default_brightness;
632e914516SFlavio Suligoi unsigned int *levels;
642e914516SFlavio Suligoi u8 dimming_mode;
652e914516SFlavio Suligoi u8 over_voltage_protection;
662e914516SFlavio Suligoi bool sync_mode;
672e914516SFlavio Suligoi u8 status;
682e914516SFlavio Suligoi };
692e914516SFlavio Suligoi
702e914516SFlavio Suligoi struct mp3309c_chip {
712e914516SFlavio Suligoi struct device *dev;
722e914516SFlavio Suligoi struct mp3309c_platform_data *pdata;
732e914516SFlavio Suligoi struct backlight_device *bl;
742e914516SFlavio Suligoi struct gpio_desc *enable_gpio;
752e914516SFlavio Suligoi struct regmap *regmap;
762e914516SFlavio Suligoi struct pwm_device *pwmd;
772e914516SFlavio Suligoi };
782e914516SFlavio Suligoi
792e914516SFlavio Suligoi static const struct regmap_config mp3309c_regmap = {
802e914516SFlavio Suligoi .name = "mp3309c_regmap",
812e914516SFlavio Suligoi .reg_bits = 8,
822e914516SFlavio Suligoi .reg_stride = 1,
832e914516SFlavio Suligoi .val_bits = 8,
842e914516SFlavio Suligoi .max_register = REG_I2C_1,
852e914516SFlavio Suligoi };
862e914516SFlavio Suligoi
mp3309c_enable_device(struct mp3309c_chip * chip)872e914516SFlavio Suligoi static int mp3309c_enable_device(struct mp3309c_chip *chip)
882e914516SFlavio Suligoi {
892e914516SFlavio Suligoi u8 reg_val;
902e914516SFlavio Suligoi int ret;
912e914516SFlavio Suligoi
922e914516SFlavio Suligoi /* I2C register #0 - Device enable */
932e914516SFlavio Suligoi ret = regmap_update_bits(chip->regmap, REG_I2C_0, REG_I2C_0_EN,
942e914516SFlavio Suligoi REG_I2C_0_EN);
952e914516SFlavio Suligoi if (ret)
962e914516SFlavio Suligoi return ret;
972e914516SFlavio Suligoi
982e914516SFlavio Suligoi /*
992e914516SFlavio Suligoi * I2C register #1 - Set working mode:
1002e914516SFlavio Suligoi * - enable/disable synchronous mode
1012e914516SFlavio Suligoi * - set overvoltage protection (OVP)
1022e914516SFlavio Suligoi */
1032e914516SFlavio Suligoi reg_val = 0x00;
1042e914516SFlavio Suligoi if (chip->pdata->sync_mode)
1052e914516SFlavio Suligoi reg_val |= REG_I2C_1_SYNC;
1062e914516SFlavio Suligoi reg_val |= chip->pdata->over_voltage_protection;
1072e914516SFlavio Suligoi ret = regmap_write(chip->regmap, REG_I2C_1, reg_val);
1082e914516SFlavio Suligoi if (ret)
1092e914516SFlavio Suligoi return ret;
1102e914516SFlavio Suligoi
1112e914516SFlavio Suligoi return 0;
1122e914516SFlavio Suligoi }
1132e914516SFlavio Suligoi
mp3309c_bl_update_status(struct backlight_device * bl)1142e914516SFlavio Suligoi static int mp3309c_bl_update_status(struct backlight_device *bl)
1152e914516SFlavio Suligoi {
1162e914516SFlavio Suligoi struct mp3309c_chip *chip = bl_get_data(bl);
1172e914516SFlavio Suligoi int brightness = backlight_get_brightness(bl);
1182e914516SFlavio Suligoi struct pwm_state pwmstate;
1192e914516SFlavio Suligoi unsigned int analog_val, bits_val;
1202e914516SFlavio Suligoi int i, ret;
1212e914516SFlavio Suligoi
1222e914516SFlavio Suligoi if (chip->pdata->dimming_mode == DIMMING_PWM) {
1232e914516SFlavio Suligoi /*
1242e914516SFlavio Suligoi * PWM control mode
1252e914516SFlavio Suligoi */
1262e914516SFlavio Suligoi pwm_get_state(chip->pwmd, &pwmstate);
1272e914516SFlavio Suligoi pwm_set_relative_duty_cycle(&pwmstate,
1282e914516SFlavio Suligoi chip->pdata->levels[brightness],
1292e914516SFlavio Suligoi chip->pdata->levels[chip->pdata->max_brightness]);
1302e914516SFlavio Suligoi pwmstate.enabled = true;
131601eedb0SSean Young ret = pwm_apply_might_sleep(chip->pwmd, &pwmstate);
1322e914516SFlavio Suligoi if (ret)
1332e914516SFlavio Suligoi return ret;
1342e914516SFlavio Suligoi
1352e914516SFlavio Suligoi switch (chip->pdata->status) {
1362e914516SFlavio Suligoi case FIRST_POWER_ON:
1372e914516SFlavio Suligoi case BACKLIGHT_OFF:
1382e914516SFlavio Suligoi /*
1392e914516SFlavio Suligoi * After 20ms of low pwm signal level, the chip turns
1402e914516SFlavio Suligoi * off automatically. In this case, before enabling the
1412e914516SFlavio Suligoi * chip again, we must wait about 10ms for pwm signal to
1422e914516SFlavio Suligoi * stabilize.
1432e914516SFlavio Suligoi */
1442e914516SFlavio Suligoi if (brightness > 0) {
1452e914516SFlavio Suligoi msleep(10);
1462e914516SFlavio Suligoi mp3309c_enable_device(chip);
1472e914516SFlavio Suligoi chip->pdata->status = BACKLIGHT_ON;
1482e914516SFlavio Suligoi } else {
1492e914516SFlavio Suligoi chip->pdata->status = BACKLIGHT_OFF;
1502e914516SFlavio Suligoi }
1512e914516SFlavio Suligoi break;
1522e914516SFlavio Suligoi case BACKLIGHT_ON:
1532e914516SFlavio Suligoi if (brightness == 0)
1542e914516SFlavio Suligoi chip->pdata->status = BACKLIGHT_OFF;
1552e914516SFlavio Suligoi break;
1562e914516SFlavio Suligoi }
1572e914516SFlavio Suligoi } else {
1582e914516SFlavio Suligoi /*
1592e914516SFlavio Suligoi * Analog (by I2C command) control mode
1602e914516SFlavio Suligoi *
1612e914516SFlavio Suligoi * The first time, before setting brightness, we must enable the
1622e914516SFlavio Suligoi * device
1632e914516SFlavio Suligoi */
1642e914516SFlavio Suligoi if (chip->pdata->status == FIRST_POWER_ON)
1652e914516SFlavio Suligoi mp3309c_enable_device(chip);
1662e914516SFlavio Suligoi
1672e914516SFlavio Suligoi /*
1682e914516SFlavio Suligoi * Dimming mode I2C command (fixed dimming range 0..31)
1692e914516SFlavio Suligoi *
1702e914516SFlavio Suligoi * The 5 bits of the dimming analog value D4..D0 is allocated
1712e914516SFlavio Suligoi * in the I2C register #0, in the following way:
1722e914516SFlavio Suligoi *
1732e914516SFlavio Suligoi * +--+--+--+--+--+--+--+--+
1742e914516SFlavio Suligoi * |EN|D0|D1|D2|D3|D4|XX|XX|
1752e914516SFlavio Suligoi * +--+--+--+--+--+--+--+--+
1762e914516SFlavio Suligoi */
1772e914516SFlavio Suligoi analog_val = brightness;
1782e914516SFlavio Suligoi bits_val = 0;
1792e914516SFlavio Suligoi for (i = 0; i <= 5; i++)
1802e914516SFlavio Suligoi bits_val += ((analog_val >> i) & 0x01) << (6 - i);
1812e914516SFlavio Suligoi ret = regmap_update_bits(chip->regmap, REG_I2C_0,
1822e914516SFlavio Suligoi ANALOG_I2C_REG_MASK, bits_val);
1832e914516SFlavio Suligoi if (ret)
1842e914516SFlavio Suligoi return ret;
1852e914516SFlavio Suligoi
1862e914516SFlavio Suligoi if (brightness > 0)
1872e914516SFlavio Suligoi chip->pdata->status = BACKLIGHT_ON;
1882e914516SFlavio Suligoi else
1892e914516SFlavio Suligoi chip->pdata->status = BACKLIGHT_OFF;
1902e914516SFlavio Suligoi }
1912e914516SFlavio Suligoi
1922e914516SFlavio Suligoi return 0;
1932e914516SFlavio Suligoi }
1942e914516SFlavio Suligoi
1952e914516SFlavio Suligoi static const struct backlight_ops mp3309c_bl_ops = {
1962e914516SFlavio Suligoi .update_status = mp3309c_bl_update_status,
1972e914516SFlavio Suligoi };
1982e914516SFlavio Suligoi
mp3309c_parse_fwnode(struct mp3309c_chip * chip,struct mp3309c_platform_data * pdata)199b54c828bSAndy Shevchenko static int mp3309c_parse_fwnode(struct mp3309c_chip *chip,
2002e914516SFlavio Suligoi struct mp3309c_platform_data *pdata)
2012e914516SFlavio Suligoi {
2022e914516SFlavio Suligoi int ret, i;
203e962f13bSDan Carpenter unsigned int tmp_value;
204b54c828bSAndy Shevchenko struct device *dev = chip->dev;
205e962f13bSDan Carpenter int num_levels;
2062e914516SFlavio Suligoi
207ee7f026aSAndy Shevchenko if (!dev_fwnode(dev))
208ee7f026aSAndy Shevchenko return dev_err_probe(dev, -ENODEV, "failed to get firmware node\n");
2092e914516SFlavio Suligoi
2102e914516SFlavio Suligoi /*
2112e914516SFlavio Suligoi * Dimming mode: the MP3309C provides two dimming control mode:
2122e914516SFlavio Suligoi *
2132e914516SFlavio Suligoi * - PWM mode
2142e914516SFlavio Suligoi * - Analog by I2C control mode (default)
2152e914516SFlavio Suligoi *
2162e914516SFlavio Suligoi * I2C control mode is assumed as default but, if the pwms property is
2172e914516SFlavio Suligoi * found in the backlight node, the mode switches to PWM mode.
2182e914516SFlavio Suligoi */
2192e914516SFlavio Suligoi pdata->dimming_mode = DIMMING_ANALOG_I2C;
220b54c828bSAndy Shevchenko if (device_property_present(dev, "pwms")) {
221d37831e0SAndy Shevchenko chip->pwmd = devm_pwm_get(dev, NULL);
2222e914516SFlavio Suligoi if (IS_ERR(chip->pwmd))
223d37831e0SAndy Shevchenko return dev_err_probe(dev, PTR_ERR(chip->pwmd), "error getting pwm data\n");
2242e914516SFlavio Suligoi pdata->dimming_mode = DIMMING_PWM;
2252e914516SFlavio Suligoi pwm_apply_args(chip->pwmd);
2262e914516SFlavio Suligoi }
2272e914516SFlavio Suligoi
2282e914516SFlavio Suligoi /*
2292e914516SFlavio Suligoi * In I2C control mode the dimming levels (0..31) are fixed by the
2302e914516SFlavio Suligoi * hardware, while in PWM control mode they can be chosen by the user,
2312e914516SFlavio Suligoi * to allow nonlinear mappings.
2322e914516SFlavio Suligoi */
2332e914516SFlavio Suligoi if (pdata->dimming_mode == DIMMING_ANALOG_I2C) {
2342e914516SFlavio Suligoi /*
2352e914516SFlavio Suligoi * Analog (by I2C commands) control mode: fixed 0..31 brightness
2362e914516SFlavio Suligoi * levels
2372e914516SFlavio Suligoi */
2382e914516SFlavio Suligoi num_levels = ANALOG_I2C_NUM_LEVELS;
2392e914516SFlavio Suligoi
2402e914516SFlavio Suligoi /* Enable GPIO used in I2C dimming mode only */
241d37831e0SAndy Shevchenko chip->enable_gpio = devm_gpiod_get(dev, "enable", GPIOD_OUT_HIGH);
2422e914516SFlavio Suligoi if (IS_ERR(chip->enable_gpio))
243d37831e0SAndy Shevchenko return dev_err_probe(dev, PTR_ERR(chip->enable_gpio),
2442e914516SFlavio Suligoi "error getting enable gpio\n");
2452e914516SFlavio Suligoi } else {
2462e914516SFlavio Suligoi /*
2472e914516SFlavio Suligoi * PWM control mode: check for brightness level in DT
2482e914516SFlavio Suligoi */
249b54c828bSAndy Shevchenko if (device_property_present(dev, "brightness-levels")) {
2502e914516SFlavio Suligoi /* Read brightness levels from DT */
251b54c828bSAndy Shevchenko num_levels = device_property_count_u32(dev, "brightness-levels");
2522e914516SFlavio Suligoi if (num_levels < 2)
2532e914516SFlavio Suligoi return -EINVAL;
2542e914516SFlavio Suligoi } else {
2552e914516SFlavio Suligoi /* Use default brightness levels */
2562e914516SFlavio Suligoi num_levels = MP3309C_PWM_DEFAULT_NUM_LEVELS;
2572e914516SFlavio Suligoi }
2582e914516SFlavio Suligoi }
2592e914516SFlavio Suligoi
2602e914516SFlavio Suligoi /* Fill brightness levels array */
261d37831e0SAndy Shevchenko pdata->levels = devm_kcalloc(dev, num_levels, sizeof(*pdata->levels), GFP_KERNEL);
2622e914516SFlavio Suligoi if (!pdata->levels)
2632e914516SFlavio Suligoi return -ENOMEM;
264b54c828bSAndy Shevchenko if (device_property_present(dev, "brightness-levels")) {
265b54c828bSAndy Shevchenko ret = device_property_read_u32_array(dev, "brightness-levels",
266b54c828bSAndy Shevchenko pdata->levels, num_levels);
2672e914516SFlavio Suligoi if (ret < 0)
2682e914516SFlavio Suligoi return ret;
2692e914516SFlavio Suligoi } else {
2702e914516SFlavio Suligoi for (i = 0; i < num_levels; i++)
2712e914516SFlavio Suligoi pdata->levels[i] = i;
2722e914516SFlavio Suligoi }
2732e914516SFlavio Suligoi
2742e914516SFlavio Suligoi pdata->max_brightness = num_levels - 1;
2752e914516SFlavio Suligoi
276b54c828bSAndy Shevchenko ret = device_property_read_u32(dev, "default-brightness", &pdata->default_brightness);
2772e914516SFlavio Suligoi if (ret)
2782e914516SFlavio Suligoi pdata->default_brightness = pdata->max_brightness;
2792e914516SFlavio Suligoi if (pdata->default_brightness > pdata->max_brightness) {
280ee7f026aSAndy Shevchenko dev_err_probe(dev, -ERANGE, "default brightness exceeds max brightness\n");
2812e914516SFlavio Suligoi pdata->default_brightness = pdata->max_brightness;
2822e914516SFlavio Suligoi }
2832e914516SFlavio Suligoi
2842e914516SFlavio Suligoi /*
2852e914516SFlavio Suligoi * Over-voltage protection (OVP)
2862e914516SFlavio Suligoi *
2872e914516SFlavio Suligoi * This (optional) property values are:
2882e914516SFlavio Suligoi *
2892e914516SFlavio Suligoi * - 13.5V
2902e914516SFlavio Suligoi * - 24V
2912e914516SFlavio Suligoi * - 35.5V (hardware default setting)
2922e914516SFlavio Suligoi *
2932e914516SFlavio Suligoi * If missing, the default value for OVP is 35.5V
2942e914516SFlavio Suligoi */
2952e914516SFlavio Suligoi pdata->over_voltage_protection = REG_I2C_1_OVP1;
296b54c828bSAndy Shevchenko ret = device_property_read_u32(dev, "mps,overvoltage-protection-microvolt", &tmp_value);
297b54c828bSAndy Shevchenko if (!ret) {
2982e914516SFlavio Suligoi switch (tmp_value) {
2992e914516SFlavio Suligoi case 13500000:
3002e914516SFlavio Suligoi pdata->over_voltage_protection = 0x00;
3012e914516SFlavio Suligoi break;
3022e914516SFlavio Suligoi case 24000000:
3032e914516SFlavio Suligoi pdata->over_voltage_protection = REG_I2C_1_OVP0;
3042e914516SFlavio Suligoi break;
3052e914516SFlavio Suligoi case 35500000:
3062e914516SFlavio Suligoi pdata->over_voltage_protection = REG_I2C_1_OVP1;
3072e914516SFlavio Suligoi break;
3082e914516SFlavio Suligoi default:
3092e914516SFlavio Suligoi return -EINVAL;
3102e914516SFlavio Suligoi }
3112e914516SFlavio Suligoi }
3122e914516SFlavio Suligoi
3132e914516SFlavio Suligoi /* Synchronous (default) and non-synchronous mode */
314b54c828bSAndy Shevchenko pdata->sync_mode = !device_property_read_bool(dev, "mps,no-sync-mode");
3152e914516SFlavio Suligoi
3162e914516SFlavio Suligoi return 0;
3172e914516SFlavio Suligoi }
3182e914516SFlavio Suligoi
mp3309c_probe(struct i2c_client * client)3192e914516SFlavio Suligoi static int mp3309c_probe(struct i2c_client *client)
3202e914516SFlavio Suligoi {
321ee7f026aSAndy Shevchenko struct device *dev = &client->dev;
322ee7f026aSAndy Shevchenko struct mp3309c_platform_data *pdata = dev_get_platdata(dev);
3232e914516SFlavio Suligoi struct mp3309c_chip *chip;
3242e914516SFlavio Suligoi struct backlight_properties props;
3252e914516SFlavio Suligoi struct pwm_state pwmstate;
3262e914516SFlavio Suligoi int ret;
3272e914516SFlavio Suligoi
328ee7f026aSAndy Shevchenko if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
329ee7f026aSAndy Shevchenko return dev_err_probe(dev, -EOPNOTSUPP, "failed to check i2c functionality\n");
3302e914516SFlavio Suligoi
331d37831e0SAndy Shevchenko chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
3322e914516SFlavio Suligoi if (!chip)
3332e914516SFlavio Suligoi return -ENOMEM;
3342e914516SFlavio Suligoi
335d37831e0SAndy Shevchenko chip->dev = dev;
3362e914516SFlavio Suligoi
3372e914516SFlavio Suligoi chip->regmap = devm_regmap_init_i2c(client, &mp3309c_regmap);
3382e914516SFlavio Suligoi if (IS_ERR(chip->regmap))
339d37831e0SAndy Shevchenko return dev_err_probe(dev, PTR_ERR(chip->regmap),
3402e914516SFlavio Suligoi "failed to allocate register map\n");
3412e914516SFlavio Suligoi
3422e914516SFlavio Suligoi i2c_set_clientdata(client, chip);
3432e914516SFlavio Suligoi
3442e914516SFlavio Suligoi if (!pdata) {
345d37831e0SAndy Shevchenko pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
3462e914516SFlavio Suligoi if (!pdata)
3472e914516SFlavio Suligoi return -ENOMEM;
3482e914516SFlavio Suligoi
349b54c828bSAndy Shevchenko ret = mp3309c_parse_fwnode(chip, pdata);
3502e914516SFlavio Suligoi if (ret)
3512e914516SFlavio Suligoi return ret;
3522e914516SFlavio Suligoi }
3532e914516SFlavio Suligoi chip->pdata = pdata;
3542e914516SFlavio Suligoi
3552e914516SFlavio Suligoi /* Backlight properties */
3567ee6478dSDaniel Thompson memset(&props, 0, sizeof(struct backlight_properties));
3572e914516SFlavio Suligoi props.brightness = pdata->default_brightness;
3582e914516SFlavio Suligoi props.max_brightness = pdata->max_brightness;
3592e914516SFlavio Suligoi props.scale = BACKLIGHT_SCALE_LINEAR;
3602e914516SFlavio Suligoi props.type = BACKLIGHT_RAW;
361*c2d9c493SThomas Zimmermann props.power = BACKLIGHT_POWER_ON;
362d37831e0SAndy Shevchenko chip->bl = devm_backlight_device_register(dev, "mp3309c", dev, chip,
3632e914516SFlavio Suligoi &mp3309c_bl_ops, &props);
3642e914516SFlavio Suligoi if (IS_ERR(chip->bl))
365d37831e0SAndy Shevchenko return dev_err_probe(dev, PTR_ERR(chip->bl),
3662e914516SFlavio Suligoi "error registering backlight device\n");
3672e914516SFlavio Suligoi
3682e914516SFlavio Suligoi /* In PWM dimming mode, enable pwm device */
3692e914516SFlavio Suligoi if (chip->pdata->dimming_mode == DIMMING_PWM) {
3702e914516SFlavio Suligoi pwm_init_state(chip->pwmd, &pwmstate);
3712e914516SFlavio Suligoi pwm_set_relative_duty_cycle(&pwmstate,
3722e914516SFlavio Suligoi chip->pdata->default_brightness,
3732e914516SFlavio Suligoi chip->pdata->max_brightness);
3742e914516SFlavio Suligoi pwmstate.enabled = true;
375601eedb0SSean Young ret = pwm_apply_might_sleep(chip->pwmd, &pwmstate);
3762e914516SFlavio Suligoi if (ret)
377d37831e0SAndy Shevchenko return dev_err_probe(dev, ret, "error setting pwm device\n");
3782e914516SFlavio Suligoi }
3792e914516SFlavio Suligoi
3802e914516SFlavio Suligoi chip->pdata->status = FIRST_POWER_ON;
3812e914516SFlavio Suligoi backlight_update_status(chip->bl);
3822e914516SFlavio Suligoi
3832e914516SFlavio Suligoi return 0;
3842e914516SFlavio Suligoi }
3852e914516SFlavio Suligoi
mp3309c_remove(struct i2c_client * client)3862e914516SFlavio Suligoi static void mp3309c_remove(struct i2c_client *client)
3872e914516SFlavio Suligoi {
3882e914516SFlavio Suligoi struct mp3309c_chip *chip = i2c_get_clientdata(client);
3892e914516SFlavio Suligoi struct backlight_device *bl = chip->bl;
3902e914516SFlavio Suligoi
391*c2d9c493SThomas Zimmermann bl->props.power = BACKLIGHT_POWER_OFF;
3922e914516SFlavio Suligoi bl->props.brightness = 0;
3932e914516SFlavio Suligoi backlight_update_status(chip->bl);
3942e914516SFlavio Suligoi }
3952e914516SFlavio Suligoi
3962e914516SFlavio Suligoi static const struct of_device_id mp3309c_match_table[] = {
3972e914516SFlavio Suligoi { .compatible = "mps,mp3309c", },
3982e914516SFlavio Suligoi { },
3992e914516SFlavio Suligoi };
4002e914516SFlavio Suligoi MODULE_DEVICE_TABLE(of, mp3309c_match_table);
4012e914516SFlavio Suligoi
4022e914516SFlavio Suligoi static const struct i2c_device_id mp3309c_id[] = {
403bfd35877SUwe Kleine-König { "mp3309c" },
4042e914516SFlavio Suligoi { }
4052e914516SFlavio Suligoi };
4062e914516SFlavio Suligoi MODULE_DEVICE_TABLE(i2c, mp3309c_id);
4072e914516SFlavio Suligoi
4082e914516SFlavio Suligoi static struct i2c_driver mp3309c_i2c_driver = {
4092e914516SFlavio Suligoi .driver = {
4102e914516SFlavio Suligoi .name = KBUILD_MODNAME,
4112e914516SFlavio Suligoi .of_match_table = mp3309c_match_table,
4122e914516SFlavio Suligoi },
4132e914516SFlavio Suligoi .probe = mp3309c_probe,
4142e914516SFlavio Suligoi .remove = mp3309c_remove,
4152e914516SFlavio Suligoi .id_table = mp3309c_id,
4162e914516SFlavio Suligoi };
4172e914516SFlavio Suligoi
4182e914516SFlavio Suligoi module_i2c_driver(mp3309c_i2c_driver);
4192e914516SFlavio Suligoi
4202e914516SFlavio Suligoi MODULE_DESCRIPTION("Backlight Driver for MPS MP3309C");
4212e914516SFlavio Suligoi MODULE_AUTHOR("Flavio Suligoi <f.suligoi@asem.it>");
4222e914516SFlavio Suligoi MODULE_LICENSE("GPL");
423