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Laurent Pincharthorms
Laurent Pinchart
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horms
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backlight: Add ROHM BD6107 backlight driver
The BD6107 is a multi-purpose 10 channels LED driver for the mobile market. Only the main channel is supported by this driver. Signed-off-by: Laurent Pinchart <[email protected]> Acked-by: Jingoo Han <[email protected]> Signed-off-by: Simon Horman <[email protected]>
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‎drivers/video/backlight/Kconfig

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@@ -438,6 +438,12 @@ config BACKLIGHT_LV5207LP
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help
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If you have a Sanyo LV5207LP say Y to enable the backlight driver.
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config BACKLIGHT_BD6107
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tristate "Rohm BD6107 Backlight"
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depends on I2C
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help
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If you have a Rohm BD6107 say Y to enable the backlight driver.
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endif # BACKLIGHT_CLASS_DEVICE
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endif # BACKLIGHT_LCD_SUPPORT

‎drivers/video/backlight/Makefile

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@@ -26,6 +26,7 @@ obj-$(CONFIG_BACKLIGHT_ADP8870) += adp8870_bl.o
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obj-$(CONFIG_BACKLIGHT_APPLE) += apple_bl.o
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obj-$(CONFIG_BACKLIGHT_AS3711) += as3711_bl.o
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obj-$(CONFIG_BACKLIGHT_ATMEL_PWM) += atmel-pwm-bl.o
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obj-$(CONFIG_BACKLIGHT_BD6107) += bd6107.o
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obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o
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obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o
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obj-$(CONFIG_BACKLIGHT_DA903X) += da903x_bl.o

‎drivers/video/backlight/bd6107.c

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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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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.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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};
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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->props.brightness;
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if (backlight->props.power != FB_BLANK_UNBLANK ||
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backlight->props.fb_blank != FB_BLANK_UNBLANK ||
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backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
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brightness = 0;
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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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gpio_set_value(bd->pdata->reset, 0);
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msleep(24);
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gpio_set_value(bd->pdata->reset, 1);
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}
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return 0;
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}
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static int bd6107_backlight_get_brightness(struct backlight_device *backlight)
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{
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return backlight->props.brightness;
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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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.get_brightness = bd6107_backlight_get_brightness,
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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 = client->dev.platform_data;
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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 || !pdata->reset) {
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dev_err(&client->dev, "No reset GPIO in 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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ret = devm_gpio_request_one(&client->dev, pdata->reset,
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GPIOF_DIR_OUT | GPIOF_INIT_LOW, "reset");
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if (ret < 0) {
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dev_err(&client->dev, "unable to request reset GPIO\n");
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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 = backlight_device_register(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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backlight_device_unregister(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");

‎include/linux/platform_data/bd6107.h

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/*
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* bd6107.h - Rohm BD6107 LEDs Driver
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __BD6107_H__
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#define __BD6107_H__
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struct device;
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struct bd6107_platform_data {
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struct device *fbdev;
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int reset; /* Reset GPIO */
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unsigned int def_value;
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};
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#endif

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