This is basic lm3533 driver only with bank A and backlight cell support.
Tested-by: Andreas Westman Dorcsak hedmoo@yahoo.com # LG P880 T30 Tested-by: Svyatoslav Ryhel clamor95@gmail.com # LG P895 T30 Signed-off-by: Svyatoslav Ryhel clamor95@gmail.com Reviewed-by: Simon Glass sjg@chromium.org --- drivers/video/Kconfig | 9 +++ drivers/video/Makefile | 1 + drivers/video/lm3533_backlight.c | 134 +++++++++++++++++++++++++++++++ 3 files changed, 144 insertions(+) create mode 100644 drivers/video/lm3533_backlight.c
diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig index 334d64c948..60048ad86a 100644 --- a/drivers/video/Kconfig +++ b/drivers/video/Kconfig @@ -606,6 +606,15 @@ config ATMEL_HLCD help HLCDC supports video output to an attached LCD panel.
+config BACKLIGHT_LM3533 + bool "Backlight Driver for LM3533" + depends on BACKLIGHT + select DM_I2C + help + Say Y to enable the backlight driver for National Semiconductor / TI + LM3533 Lighting Power chip. Only Bank A is supported as for now. + Supported backlight level range is from 2 to 255 with step of 1. + source "drivers/video/ti/Kconfig"
source "drivers/video/exynos/Kconfig" diff --git a/drivers/video/Makefile b/drivers/video/Makefile index 4d75771745..05fb063105 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -28,6 +28,7 @@ obj-$(CONFIG_VIDEO_LOGO) += u_boot_logo.o
endif
+obj-$(CONFIG_BACKLIGHT_LM3533) += lm3533_backlight.o obj-${CONFIG_EXYNOS_FB} += exynos/ obj-${CONFIG_VIDEO_ROCKCHIP} += rockchip/ obj-${CONFIG_VIDEO_STM32} += stm32/ diff --git a/drivers/video/lm3533_backlight.c b/drivers/video/lm3533_backlight.c new file mode 100644 index 0000000000..00297a09b7 --- /dev/null +++ b/drivers/video/lm3533_backlight.c @@ -0,0 +1,134 @@ +// 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), +};