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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2025 Ion Agorria <ion@agorria.com>
*/
#define LOG_CATEGORY UCLASS_PANEL_BACKLIGHT
#include <backlight.h>
#include <dm.h>
#include <i2c.h>
#include <log.h>
#include <linux/err.h>
#include <asm/gpio.h>
#include <power/regulator.h>
#define CMC623_I2C_REG_SELBANK 0x00
#define CMC623_I2C_REG_PWMCTRL 0xb4
#define CMC623_I2C_REG_REGMASK 0x28
#define CMC623_BL_MIN_BRIGHTNESS 0
#define CMC623_BL_DEF_BRIGHTNESS 50
#define CMC623_BL_MAX_BRIGHTNESS 100
struct cmc623_backlight_priv {
struct gpio_desc enable_gpio;
};
static int cmc623_backlight_enable(struct udevice *dev)
{
struct cmc623_backlight_priv *priv = dev_get_priv(dev);
if (dm_gpio_is_valid(&priv->enable_gpio))
dm_gpio_set_value(&priv->enable_gpio, 1);
return 0;
}
static int cmc623_i2c_write(struct udevice *dev, u8 reg, u16 value)
{
u8 data[2];
data[0] = (value >> 8) & 0xff;
data[1] = value & 0xff;
return dm_i2c_write(dev->parent, reg, data, 2);
}
static int cmc623_backlight_set_brightness(struct udevice *dev, int percent)
{
int ret;
u16 brightness;
if (percent == BACKLIGHT_DEFAULT)
percent = CMC623_BL_DEF_BRIGHTNESS;
if (percent < CMC623_BL_MIN_BRIGHTNESS)
percent = CMC623_BL_MIN_BRIGHTNESS;
if (percent > CMC623_BL_MAX_BRIGHTNESS)
percent = CMC623_BL_MAX_BRIGHTNESS;
brightness = 0x4000 | (percent << 4);
ret = cmc623_i2c_write(dev, CMC623_I2C_REG_SELBANK, 0x0000);
if (ret) {
log_debug("%s: error at CMC623_I2C_REG_SELBANK (%d)\n",
__func__, ret);
return ret;
}
ret = cmc623_i2c_write(dev, CMC623_I2C_REG_PWMCTRL, brightness);
if (ret) {
log_debug("%s: error at CMC623_I2C_REG_PWMCTRL (%d)\n",
__func__, ret);
return ret;
}
ret = cmc623_i2c_write(dev, CMC623_I2C_REG_REGMASK, 0x0000);
if (ret) {
log_debug("%s: error at CMC623_I2C_REG_REGMASK (%d)\n",
__func__, ret);
return ret;
}
return 0;
}
static int cmc623_backlight_of_to_plat(struct udevice *dev)
{
struct cmc623_backlight_priv *priv = dev_get_priv(dev);
gpio_request_by_name(dev, "enable-gpios", 0,
&priv->enable_gpio, GPIOD_IS_OUT);
return 0;
}
static int cmc623_backlight_probe(struct udevice *dev)
{
if (device_get_uclass_id(dev->parent) != UCLASS_VIDEO_BRIDGE)
return -EPROTONOSUPPORT;
return 0;
}
static const struct backlight_ops cmc623_backlight_ops = {
.enable = cmc623_backlight_enable,
.set_brightness = cmc623_backlight_set_brightness,
};
static const struct udevice_id cmc623_backlight_ids[] = {
{ .compatible = "samsung,cmc623-backlight" },
{ }
};
U_BOOT_DRIVER(cmc623_backlight) = {
.name = "cmc623_backlight",
.id = UCLASS_PANEL_BACKLIGHT,
.of_match = cmc623_backlight_ids,
.of_to_plat = cmc623_backlight_of_to_plat,
.probe = cmc623_backlight_probe,
.ops = &cmc623_backlight_ops,
.priv_auto = sizeof(struct cmc623_backlight_priv),
};
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