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207 lines
5.5 KiB
207 lines
5.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* ROHM Semiconductor BD6107 LED Driver |
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* |
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* Copyright (C) 2013 Ideas on board SPRL |
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* |
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* Contact: Laurent Pinchart <[email protected]> |
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*/ |
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#include <linux/backlight.h> |
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#include <linux/delay.h> |
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#include <linux/err.h> |
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#include <linux/fb.h> |
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#include <linux/gpio/consumer.h> |
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#include <linux/i2c.h> |
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#include <linux/module.h> |
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#include <linux/platform_data/bd6107.h> |
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#include <linux/slab.h> |
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#define BD6107_PSCNT1 0x00 |
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#define BD6107_PSCNT1_PSCNTREG2 (1 << 2) |
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#define BD6107_PSCNT1_PSCNTREG1 (1 << 0) |
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#define BD6107_REGVSET 0x02 |
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#define BD6107_REGVSET_REG1VSET_2_85V (1 << 2) |
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#define BD6107_REGVSET_REG1VSET_2_80V (0 << 2) |
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#define BD6107_LEDCNT1 0x03 |
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#define BD6107_LEDCNT1_LEDONOFF2 (1 << 1) |
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#define BD6107_LEDCNT1_LEDONOFF1 (1 << 0) |
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#define BD6107_PORTSEL 0x04 |
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#define BD6107_PORTSEL_LEDM(n) (1 << (n)) |
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#define BD6107_RGB1CNT1 0x05 |
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#define BD6107_RGB1CNT2 0x06 |
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#define BD6107_RGB1CNT3 0x07 |
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#define BD6107_RGB1CNT4 0x08 |
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#define BD6107_RGB1CNT5 0x09 |
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#define BD6107_RGB1FLM 0x0a |
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#define BD6107_RGB2CNT1 0x0b |
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#define BD6107_RGB2CNT2 0x0c |
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#define BD6107_RGB2CNT3 0x0d |
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#define BD6107_RGB2CNT4 0x0e |
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#define BD6107_RGB2CNT5 0x0f |
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#define BD6107_RGB2FLM 0x10 |
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#define BD6107_PSCONT3 0x11 |
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#define BD6107_SMMONCNT 0x12 |
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#define BD6107_DCDCCNT 0x13 |
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#define BD6107_IOSEL 0x14 |
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#define BD6107_OUT1 0x15 |
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#define BD6107_OUT2 0x16 |
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#define BD6107_MASK1 0x17 |
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#define BD6107_MASK2 0x18 |
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#define BD6107_FACTOR1 0x19 |
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#define BD6107_FACTOR2 0x1a |
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#define BD6107_CLRFACT1 0x1b |
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#define BD6107_CLRFACT2 0x1c |
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#define BD6107_STATE1 0x1d |
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#define BD6107_LSIVER 0x1e |
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#define BD6107_GRPSEL 0x1f |
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#define BD6107_LEDCNT2 0x20 |
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#define BD6107_LEDCNT3 0x21 |
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#define BD6107_MCURRENT 0x22 |
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#define BD6107_MAINCNT1 0x23 |
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#define BD6107_MAINCNT2 0x24 |
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#define BD6107_SLOPECNT 0x25 |
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#define BD6107_MSLOPE 0x26 |
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#define BD6107_RGBSLOPE 0x27 |
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#define BD6107_TEST 0x29 |
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#define BD6107_SFTRST 0x2a |
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#define BD6107_SFTRSTGD 0x2b |
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struct bd6107 { |
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struct i2c_client *client; |
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struct backlight_device *backlight; |
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struct bd6107_platform_data *pdata; |
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struct gpio_desc *reset; |
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}; |
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static int bd6107_write(struct bd6107 *bd, u8 reg, u8 data) |
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{ |
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return i2c_smbus_write_byte_data(bd->client, reg, data); |
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} |
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static int bd6107_backlight_update_status(struct backlight_device *backlight) |
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{ |
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struct bd6107 *bd = bl_get_data(backlight); |
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int brightness = backlight_get_brightness(backlight); |
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if (brightness) { |
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bd6107_write(bd, BD6107_PORTSEL, BD6107_PORTSEL_LEDM(2) | |
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BD6107_PORTSEL_LEDM(1) | BD6107_PORTSEL_LEDM(0)); |
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bd6107_write(bd, BD6107_MAINCNT1, brightness); |
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bd6107_write(bd, BD6107_LEDCNT1, BD6107_LEDCNT1_LEDONOFF1); |
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} else { |
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/* Assert the reset line (gpiolib will handle active low) */ |
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gpiod_set_value(bd->reset, 1); |
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msleep(24); |
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gpiod_set_value(bd->reset, 0); |
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} |
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return 0; |
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} |
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static int bd6107_backlight_check_fb(struct backlight_device *backlight, |
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struct fb_info *info) |
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{ |
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struct bd6107 *bd = bl_get_data(backlight); |
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return bd->pdata->fbdev == NULL || bd->pdata->fbdev == info->dev; |
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} |
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static const struct backlight_ops bd6107_backlight_ops = { |
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.options = BL_CORE_SUSPENDRESUME, |
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.update_status = bd6107_backlight_update_status, |
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.check_fb = bd6107_backlight_check_fb, |
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}; |
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static int bd6107_probe(struct i2c_client *client, |
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const struct i2c_device_id *id) |
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{ |
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struct bd6107_platform_data *pdata = dev_get_platdata(&client->dev); |
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struct backlight_device *backlight; |
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struct backlight_properties props; |
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struct bd6107 *bd; |
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int ret; |
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if (pdata == NULL) { |
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dev_err(&client->dev, "No platform data\n"); |
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return -EINVAL; |
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} |
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if (!i2c_check_functionality(client->adapter, |
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I2C_FUNC_SMBUS_BYTE_DATA)) { |
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dev_warn(&client->dev, |
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"I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n"); |
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return -EIO; |
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} |
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bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL); |
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if (!bd) |
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return -ENOMEM; |
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bd->client = client; |
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bd->pdata = pdata; |
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/* |
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* Request the reset GPIO line with GPIOD_OUT_HIGH meaning asserted, |
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* so in the machine descriptor table (or other hardware description), |
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* the line should be flagged as active low so this will assert |
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* the reset. |
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*/ |
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bd->reset = devm_gpiod_get(&client->dev, "reset", GPIOD_OUT_HIGH); |
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if (IS_ERR(bd->reset)) { |
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dev_err(&client->dev, "unable to request reset GPIO\n"); |
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ret = PTR_ERR(bd->reset); |
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return ret; |
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} |
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memset(&props, 0, sizeof(props)); |
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props.type = BACKLIGHT_RAW; |
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props.max_brightness = 128; |
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props.brightness = clamp_t(unsigned int, pdata->def_value, 0, |
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props.max_brightness); |
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backlight = devm_backlight_device_register(&client->dev, |
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dev_name(&client->dev), |
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&bd->client->dev, bd, |
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&bd6107_backlight_ops, &props); |
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if (IS_ERR(backlight)) { |
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dev_err(&client->dev, "failed to register backlight\n"); |
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return PTR_ERR(backlight); |
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} |
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backlight_update_status(backlight); |
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i2c_set_clientdata(client, backlight); |
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return 0; |
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} |
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static int bd6107_remove(struct i2c_client *client) |
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{ |
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struct backlight_device *backlight = i2c_get_clientdata(client); |
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backlight->props.brightness = 0; |
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backlight_update_status(backlight); |
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return 0; |
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} |
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static const struct i2c_device_id bd6107_ids[] = { |
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{ "bd6107", 0 }, |
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{ } |
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}; |
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MODULE_DEVICE_TABLE(i2c, bd6107_ids); |
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static struct i2c_driver bd6107_driver = { |
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.driver = { |
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.name = "bd6107", |
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}, |
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.probe = bd6107_probe, |
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.remove = bd6107_remove, |
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.id_table = bd6107_ids, |
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}; |
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module_i2c_driver(bd6107_driver); |
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MODULE_DESCRIPTION("Rohm BD6107 Backlight Driver"); |
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MODULE_AUTHOR("Laurent Pinchart <[email protected]>"); |
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MODULE_LICENSE("GPL");
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