LM3695 has 2 backlight strings and 11 bit dimming is supported. Common backlight driver is controlled by TI LMU backlight driver. Only LM3695 specific code is implemented here. Cc: Jingoo Han <jingoohan1@xxxxxxxxx> Cc: Lee Jones <lee.jones@xxxxxxxxxx> Cc: linux-kernel@xxxxxxxxxxxxxxx Signed-off-by: Milo Kim <milo.kim@xxxxxx> --- drivers/video/backlight/Kconfig | 8 ++++ drivers/video/backlight/Makefile | 1 + drivers/video/backlight/lm3695_bl.c | 91 +++++++++++++++++++++++++++++++++++++ 3 files changed, 100 insertions(+) create mode 100644 drivers/video/backlight/lm3695_bl.c diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index e3c4adb..c1dc908 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -426,6 +426,14 @@ config BACKLIGHT_LM3633 Up to 3 backlight strings and 11 bit dimming is supported. PWM brightness control is also supported. +config BACKLIGHT_LM3695 + tristate "Backlight driver for TI LM3695" + depends on BACKLIGHT_CLASS_DEVICE && MFD_TI_LMU + select TI_LMU_BACKLIGHT + help + Say Y to enable the backlight driver for TI LM3695. + Up to 2 backlight strings and 11 bit dimming is supported. + config TI_LMU_BACKLIGHT tristate "Backlight driver for TI LMU" depends on BACKLIGHT_LM3532 || BACKLIGHT_LM3631 || \ diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index 364b854..af20285 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -43,6 +43,7 @@ obj-$(CONFIG_BACKLIGHT_LM3631) += lm3631_bl.o obj-$(CONFIG_BACKLIGHT_LM3632) += lm3632_bl.o obj-$(CONFIG_BACKLIGHT_LM3633) += lm3633_bl.o obj-$(CONFIG_BACKLIGHT_LM3639) += lm3639_bl.o +obj-$(CONFIG_BACKLIGHT_LM3695) += lm3695_bl.o obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.o obj-$(CONFIG_BACKLIGHT_LP855X) += lp855x_bl.o obj-$(CONFIG_BACKLIGHT_LP8788) += lp8788_bl.o diff --git a/drivers/video/backlight/lm3695_bl.c b/drivers/video/backlight/lm3695_bl.c new file mode 100644 index 0000000..fe47d00 --- /dev/null +++ b/drivers/video/backlight/lm3695_bl.c @@ -0,0 +1,91 @@ +/* + * TI LM3695 Backlight Driver + * + * Copyright 2015 Texas Instruments + * + * Author: Milo Kim <milo.kim@xxxxxx> + * + * 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/delay.h> +#include <linux/kernel.h> +#include <linux/mfd/ti-lmu.h> +#include <linux/mfd/ti-lmu-register.h> +#include <linux/module.h> + +#include "ti-lmu-backlight.h" + +#define LM3695_FULL_STRINGS (LMU_HVLED1 | LMU_HVLED2) +#define LM3695_MAX_BRIGHTNESS 2047 + +static int lm3695_bl_enable(struct ti_lmu_bl *lmu_bl, int enable) +{ + int ret; + + ret = ti_lmu_update_bits(lmu_bl->chip->lmu, LM3695_REG_GP, + LM3695_BL_EN_MASK, enable); + if (ret) + return ret; + + /* Wait time for brightness register wake up */ + usleep_range(600, 700); + + return 0; +} + +static int lm3695_bl_set_brightness(struct ti_lmu_bl *lmu_bl, int brightness) +{ + u8 data; + int ret; + + data = brightness & LM3695_BRT_LSB_MASK; + ret = ti_lmu_update_bits(lmu_bl->chip->lmu, LM3695_REG_BRT_LSB, + LM3695_BRT_LSB_MASK, data); + if (ret) + return ret; + + data = (brightness >> LM3695_BRT_MSB_SHIFT) & 0xFF; + return ti_lmu_write_byte(lmu_bl->chip->lmu, LM3695_REG_BRT_MSB, + data); +} + +static int lm3695_bl_init(struct ti_lmu_bl_chip *chip) +{ + return ti_lmu_update_bits(chip->lmu, LM3695_REG_GP, + LM3695_BRT_RW_MASK, LM3695_BRT_RW_MASK); +} + +static int lm3695_bl_configure(struct ti_lmu_bl *lmu_bl) +{ + u8 val; + + if (lmu_bl->bl_string == LM3695_FULL_STRINGS) + val = LM3695_BL_TWO_STRINGS; + else + val = LM3695_BL_ONE_STRING; + + return ti_lmu_update_bits(lmu_bl->chip->lmu, LM3695_REG_GP, + LM3695_BL_STRING_MASK, val); +} + +static const struct ti_lmu_bl_ops lm3695_lmu_ops = { + .init = lm3695_bl_init, + .configure = lm3695_bl_configure, + .update_brightness = lm3695_bl_set_brightness, + .bl_enable = lm3695_bl_enable, + .max_brightness = LM3695_MAX_BRIGHTNESS, +}; + +/* LM3695 backlight of_device_id */ +TI_LMU_BL_OF_DEVICE(lm3695, "ti,lm3695-backlight"); + +/* LM3695 backlight platform driver */ +TI_LMU_BL_PLATFORM_DRIVER(lm3695, "lm3695-backlight"); + +MODULE_DESCRIPTION("TI LM3695 Backlight Driver"); +MODULE_AUTHOR("Milo Kim"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:lm3695-backlight"); -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html