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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2022 Svyatoslav Ryhel <clamor95@gmail.com>
*/
#define LOG_CATEGORY UCLASS_PANEL_BACKLIGHT
#include <backlight.h>
#include <common.h>
#include <dm.h>
#include <i2c.h>
#include <log.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <asm/gpio.h>
#define LM3533_BL_MIN_BRIGHTNESS 0x02
#define LM3533_BL_MAX_BRIGHTNESS 0xFF
#define LM3533_SINK_OUTPUT_CONFIG_1 0x10
#define LM3533_CONTROL_BANK_A_PWM 0x14
#define LM3533_CONTROL_BANK_AB_BRIGHTNESS 0x1A
#define LM3533_CONTROL_BANK_A_FULLSCALE_CURRENT 0x1F
#define LM3533_CONTROL_BANK_ENABLE 0x27
#define LM3533_OVP_FREQUENCY_PWM_POLARITY 0x2C
#define LM3533_BRIGHTNESS_REGISTER_A 0x40
struct lm3533_backlight_priv {
struct gpio_desc enable_gpio;
u32 def_bl_lvl;
};
static int lm3533_backlight_enable(struct udevice *dev)
{
struct lm3533_backlight_priv *priv = dev_get_priv(dev);
int ret;
dm_gpio_set_value(&priv->enable_gpio, 1);
mdelay(5);
/* HVLED 1 & 2 are controlled by Bank A */
ret = dm_i2c_reg_write(dev, LM3533_SINK_OUTPUT_CONFIG_1, 0x00);
if (ret)
return ret;
/* PWM input is disabled for CABC */
ret = dm_i2c_reg_write(dev, LM3533_CONTROL_BANK_A_PWM, 0x00);
if (ret)
return ret;
/* Linear & Control Bank A is configured for register Current control */
ret = dm_i2c_reg_write(dev, LM3533_CONTROL_BANK_AB_BRIGHTNESS, 0x02);
if (ret)
return ret;
/* Full-Scale Current (20.2mA) */
ret = dm_i2c_reg_write(dev, LM3533_CONTROL_BANK_A_FULLSCALE_CURRENT, 0x13);
if (ret)
return ret;
/* Control Bank A is enable */
ret = dm_i2c_reg_write(dev, LM3533_CONTROL_BANK_ENABLE, 0x01);
if (ret)
return ret;
ret = dm_i2c_reg_write(dev, LM3533_OVP_FREQUENCY_PWM_POLARITY, 0x0A);
if (ret)
return ret;
return 0;
}
static int lm3533_backlight_set_brightness(struct udevice *dev, int percent)
{
struct lm3533_backlight_priv *priv = dev_get_priv(dev);
int ret;
if (percent == BACKLIGHT_DEFAULT)
percent = priv->def_bl_lvl;
if (percent < LM3533_BL_MIN_BRIGHTNESS)
percent = LM3533_BL_MIN_BRIGHTNESS;
if (percent > LM3533_BL_MAX_BRIGHTNESS)
percent = LM3533_BL_MAX_BRIGHTNESS;
/* Set brightness level */
ret = dm_i2c_reg_write(dev, LM3533_BRIGHTNESS_REGISTER_A,
percent);
if (ret)
return ret;
return 0;
}
static int lm3533_backlight_probe(struct udevice *dev)
{
struct lm3533_backlight_priv *priv = dev_get_priv(dev);
int ret;
if (device_get_uclass_id(dev->parent) != UCLASS_I2C)
return -EPROTONOSUPPORT;
ret = gpio_request_by_name(dev, "enable-gpios", 0,
&priv->enable_gpio, GPIOD_IS_OUT);
if (ret) {
log_err("Could not decode enable-gpios (%d)\n", ret);
return ret;
}
priv->def_bl_lvl = dev_read_u32_default(dev, "default-brightness-level",
LM3533_BL_MAX_BRIGHTNESS);
return 0;
}
static const struct backlight_ops lm3533_backlight_ops = {
.enable = lm3533_backlight_enable,
.set_brightness = lm3533_backlight_set_brightness,
};
static const struct udevice_id lm3533_backlight_ids[] = {
{ .compatible = "ti,lm3533" },
{ }
};
U_BOOT_DRIVER(lm3533_backlight) = {
.name = "lm3533_backlight",
.id = UCLASS_PANEL_BACKLIGHT,
.of_match = lm3533_backlight_ids,
.probe = lm3533_backlight_probe,
.ops = &lm3533_backlight_ops,
.priv_auto = sizeof(struct lm3533_backlight_priv),
};
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