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/*
* ROHM Semiconductor BD6107 LED Driver
*
* Copyright (C) 2013 Ideas on board SPRL
*
* Contact: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/fb.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/platform_data/bd6107.h>
#include <linux/slab.h>
#define BD6107_PSCNT1 0x00
#define BD6107_PSCNT1_PSCNTREG2 (1 << 2)
#define BD6107_PSCNT1_PSCNTREG1 (1 << 0)
#define BD6107_REGVSET 0x02
#define BD6107_REGVSET_REG1VSET_2_85V (1 << 2)
#define BD6107_REGVSET_REG1VSET_2_80V (0 << 2)
#define BD6107_LEDCNT1 0x03
#define BD6107_LEDCNT1_LEDONOFF2 (1 << 1)
#define BD6107_LEDCNT1_LEDONOFF1 (1 << 0)
#define BD6107_PORTSEL 0x04
#define BD6107_PORTSEL_LEDM(n) (1 << (n))
#define BD6107_RGB1CNT1 0x05
#define BD6107_RGB1CNT2 0x06
#define BD6107_RGB1CNT3 0x07
#define BD6107_RGB1CNT4 0x08
#define BD6107_RGB1CNT5 0x09
#define BD6107_RGB1FLM 0x0a
#define BD6107_RGB2CNT1 0x0b
#define BD6107_RGB2CNT2 0x0c
#define BD6107_RGB2CNT3 0x0d
#define BD6107_RGB2CNT4 0x0e
#define BD6107_RGB2CNT5 0x0f
#define BD6107_RGB2FLM 0x10
#define BD6107_PSCONT3 0x11
#define BD6107_SMMONCNT 0x12
#define BD6107_DCDCCNT 0x13
#define BD6107_IOSEL 0x14
#define BD6107_OUT1 0x15
#define BD6107_OUT2 0x16
#define BD6107_MASK1 0x17
#define BD6107_MASK2 0x18
#define BD6107_FACTOR1 0x19
#define BD6107_FACTOR2 0x1a
#define BD6107_CLRFACT1 0x1b
#define BD6107_CLRFACT2 0x1c
#define BD6107_STATE1 0x1d
#define BD6107_LSIVER 0x1e
#define BD6107_GRPSEL 0x1f
#define BD6107_LEDCNT2 0x20
#define BD6107_LEDCNT3 0x21
#define BD6107_MCURRENT 0x22
#define BD6107_MAINCNT1 0x23
#define BD6107_MAINCNT2 0x24
#define BD6107_SLOPECNT 0x25
#define BD6107_MSLOPE 0x26
#define BD6107_RGBSLOPE 0x27
#define BD6107_TEST 0x29
#define BD6107_SFTRST 0x2a
#define BD6107_SFTRSTGD 0x2b
struct bd6107 {
struct i2c_client *client;
struct backlight_device *backlight;
struct bd6107_platform_data *pdata;
};
static int bd6107_write(struct bd6107 *bd, u8 reg, u8 data)
{
return i2c_smbus_write_byte_data(bd->client, reg, data);
}
static int bd6107_backlight_update_status(struct backlight_device *backlight)
{
struct bd6107 *bd = bl_get_data(backlight);
int brightness = backlight->props.brightness;
if (backlight->props.power != FB_BLANK_UNBLANK ||
backlight->props.fb_blank != FB_BLANK_UNBLANK ||
backlight->props.state & (BL_CORE_SUSPENDED | BL_CORE_FBBLANK))
brightness = 0;
if (brightness) {
bd6107_write(bd, BD6107_PORTSEL, BD6107_PORTSEL_LEDM(2) |
BD6107_PORTSEL_LEDM(1) | BD6107_PORTSEL_LEDM(0));
bd6107_write(bd, BD6107_MAINCNT1, brightness);
bd6107_write(bd, BD6107_LEDCNT1, BD6107_LEDCNT1_LEDONOFF1);
} else {
gpio_set_value(bd->pdata->reset, 0);
msleep(24);
gpio_set_value(bd->pdata->reset, 1);
}
return 0;
}
static int bd6107_backlight_get_brightness(struct backlight_device *backlight)
{
return backlight->props.brightness;
}
static int bd6107_backlight_check_fb(struct backlight_device *backlight,
struct fb_info *info)
{
struct bd6107 *bd = bl_get_data(backlight);
return bd->pdata->fbdev == NULL || bd->pdata->fbdev == info->dev;
}
static const struct backlight_ops bd6107_backlight_ops = {
.options = BL_CORE_SUSPENDRESUME,
.update_status = bd6107_backlight_update_status,
.get_brightness = bd6107_backlight_get_brightness,
.check_fb = bd6107_backlight_check_fb,
};
static int bd6107_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct bd6107_platform_data *pdata = client->dev.platform_data;
struct backlight_device *backlight;
struct backlight_properties props;
struct bd6107 *bd;
int ret;
if (pdata == NULL || !pdata->reset) {
dev_err(&client->dev, "No reset GPIO in platform data\n");
return -EINVAL;
}
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_BYTE_DATA)) {
dev_warn(&client->dev,
"I2C adapter doesn't support I2C_FUNC_SMBUS_BYTE\n");
return -EIO;
}
bd = devm_kzalloc(&client->dev, sizeof(*bd), GFP_KERNEL);
if (!bd)
return -ENOMEM;
bd->client = client;
bd->pdata = pdata;
ret = devm_gpio_request_one(&client->dev, pdata->reset,
GPIOF_DIR_OUT | GPIOF_INIT_LOW, "reset");
if (ret < 0) {
dev_err(&client->dev, "unable to request reset GPIO\n");
return ret;
}
memset(&props, 0, sizeof(props));
props.type = BACKLIGHT_RAW;
props.max_brightness = 128;
props.brightness = clamp_t(unsigned int, pdata->def_value, 0,
props.max_brightness);
backlight = backlight_device_register(dev_name(&client->dev),
&bd->client->dev, bd,
&bd6107_backlight_ops, &props);
if (IS_ERR(backlight)) {
dev_err(&client->dev, "failed to register backlight\n");
return PTR_ERR(backlight);
}
backlight_update_status(backlight);
i2c_set_clientdata(client, backlight);
return 0;
}
static int bd6107_remove(struct i2c_client *client)
{
struct backlight_device *backlight = i2c_get_clientdata(client);
backlight->props.brightness = 0;
backlight_update_status(backlight);
backlight_device_unregister(backlight);
return 0;
}
static const struct i2c_device_id bd6107_ids[] = {
{ "bd6107", 0 },
{ }
};
MODULE_DEVICE_TABLE(i2c, bd6107_ids);
static struct i2c_driver bd6107_driver = {
.driver = {
.name = "bd6107",
},
.probe = bd6107_probe,
.remove = bd6107_remove,
.id_table = bd6107_ids,
};
module_i2c_driver(bd6107_driver);
MODULE_DESCRIPTION("Rohm BD6107 Backlight Driver");
MODULE_AUTHOR("Laurent Pinchart <laurent.pinchart@ideasonboard.com>");
MODULE_LICENSE("GPL");
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