This is a general driver for LM3509 backlight chip of TI. LM3509 is High Efficiency Boost for White LEDs and/or OLED Displays with Dual Current Sinks. This driver supports OLED/White LED select, brightness control and sub/main control. The datasheet can be found at http://www.ti.com/product/lm3509. Signed-off-by: Patrick Gansterer <paroga@xxxxxxxxxx> --- drivers/video/backlight/Kconfig | 7 + drivers/video/backlight/Makefile | 1 + drivers/video/backlight/lm3509_bl.c | 247 ++++++++++++++++++++++++++++ 3 files changed, 255 insertions(+) create mode 100644 drivers/video/backlight/lm3509_bl.c diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index ea2d0d69bd8c..96ad5dc584b6 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -366,6 +366,13 @@ config BACKLIGHT_AAT2870 If you have a AnalogicTech AAT2870 say Y to enable the backlight driver. +config BACKLIGHT_LM3509 + tristate "Backlight Driver for LM3509" + depends on I2C + select REGMAP_I2C + help + This supports TI LM3509 Backlight Driver + config BACKLIGHT_LM3630A tristate "Backlight Driver for LM3630A" depends on I2C && PWM diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index 06966cb20459..51a4ac5d0530 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -35,6 +35,7 @@ obj-$(CONFIG_BACKLIGHT_HP700) += jornada720_bl.o obj-$(CONFIG_BACKLIGHT_IPAQ_MICRO) += ipaq_micro_bl.o obj-$(CONFIG_BACKLIGHT_KTD253) += ktd253-backlight.o obj-$(CONFIG_BACKLIGHT_KTZ8866) += ktz8866.o +obj-$(CONFIG_BACKLIGHT_LM3509) += lm3509_bl.o obj-$(CONFIG_BACKLIGHT_LM3533) += lm3533_bl.o obj-$(CONFIG_BACKLIGHT_LM3630A) += lm3630a_bl.o obj-$(CONFIG_BACKLIGHT_LM3639) += lm3639_bl.o diff --git a/drivers/video/backlight/lm3509_bl.c b/drivers/video/backlight/lm3509_bl.c new file mode 100644 index 000000000000..977145374641 --- /dev/null +++ b/drivers/video/backlight/lm3509_bl.c @@ -0,0 +1,247 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +#include <linux/backlight.h> +#include <linux/delay.h> +#include <linux/gpio/consumer.h> +#include <linux/i2c.h> +#include <linux/module.h> +#include <linux/regmap.h> + +#define LM3509_NAME "lm3509_bl" + +#define LM3509_DEF_BRIGHTNESS 0x12 +#define LM3509_MAX_BRIGHTNESS 0x1F + +#define REG_GP 0x10 +#define REG_BMAIN 0xA0 +#define REG_BSUB 0xB0 +#define REG_MAX 0xFF + +enum { + REG_GP_ENM_BIT = 0, + REG_GP_ENS_BIT, + REG_GP_UNI_BIT, + REG_GP_RMP0_BIT, + REG_GP_RMP1_BIT, + REG_GP_OLED_BIT, +}; + +struct lm3509_bl { + struct regmap *regmap; + struct backlight_device *bl_main; + struct backlight_device *bl_sub; + struct gpio_desc *reset_gpio; +}; + +static void lm3509_reset(struct lm3509_bl *data) +{ + if (data->reset_gpio) { + gpiod_set_value(data->reset_gpio, 1); + udelay(1); + gpiod_set_value(data->reset_gpio, 0); + udelay(10); + } +} + +static int lm3509_update_status(struct backlight_device *bl, + unsigned int en_mask, unsigned int br_reg) +{ + struct lm3509_bl *data = bl_get_data(bl); + int ret; + bool en; + + ret = regmap_write(data->regmap, br_reg, bl->props.brightness); + if (ret < 0) + return ret; + + en = bl->props.power <= FB_BLANK_NORMAL; + return regmap_update_bits(data->regmap, REG_GP, en_mask, + en ? en_mask : 0); +} + +static int lm3509_main_update_status(struct backlight_device *bl) +{ + return lm3509_update_status(bl, BIT(REG_GP_ENM_BIT), REG_BMAIN); +} + +static const struct backlight_ops lm3509_main_ops = { + .options = BL_CORE_SUSPENDRESUME, + .update_status = lm3509_main_update_status, +}; + +static int lm3509_sub_update_status(struct backlight_device *bl) +{ + return lm3509_update_status(bl, BIT(REG_GP_ENS_BIT), REG_BSUB); +} + +static const struct backlight_ops lm3509_sub_ops = { + .options = BL_CORE_SUSPENDRESUME, + .update_status = lm3509_sub_update_status, +}; + +static struct backlight_device *lm3509_backlight_register( + struct device *dev, const char *name_suffix, struct lm3509_bl *data, + const struct backlight_ops *ops, int brightness, int max_brightness) + +{ + struct backlight_device *bd; + struct backlight_properties props; + char name[64]; + + memset(&props, 0, sizeof(props)); + props.type = BACKLIGHT_RAW; + props.brightness = brightness; + props.max_brightness = max_brightness; + props.power = brightness > 0 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN; + + snprintf(name, sizeof(name), "lm3509-%s-%s", dev_name(dev), + name_suffix); + + bd = devm_backlight_device_register(dev, name, dev, data, ops, &props); + if (bd) + backlight_update_status(bd); + + return bd; +} + +static const struct regmap_config lm3509_regmap = { + .reg_bits = 8, + .val_bits = 8, + .max_register = REG_MAX, +}; + +static int lm3509_probe(struct i2c_client *client) +{ + struct lm3509_bl *data; + struct device *dev = &client->dev; + int ret; + bool unison_mode = false; + bool oled_mode = false; + unsigned int reg_gp_val = 0; + u32 rate_of_change = 0; + u32 brightness = LM3509_DEF_BRIGHTNESS; + u32 max_brightness = LM3509_MAX_BRIGHTNESS; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { + dev_err(dev, "fail : i2c functionality check\n"); + return -EOPNOTSUPP; + } + + data = devm_kzalloc(dev, sizeof(struct lm3509_bl), GFP_KERNEL); + if (!data) + return -ENOMEM; + + data->regmap = devm_regmap_init_i2c(client, &lm3509_regmap); + if (IS_ERR(data->regmap)) { + dev_err(dev, "fail : allocate register map\n"); + return PTR_ERR(data->regmap); + } + i2c_set_clientdata(client, data); + + data->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); + if (IS_ERR(data->reset_gpio)) { + ret = PTR_ERR(data->reset_gpio); + if (ret != -EPROBE_DEFER) + dev_err(dev, "fail : get reset GPIO: %d\n", ret); + return ret; + } + + lm3509_reset(data); + + of_property_read_u32(dev->of_node, "default-brightness", &brightness); + of_property_read_u32(dev->of_node, "max-brightness", &max_brightness); + unison_mode = of_property_read_bool(dev->of_node, "ti,unison-mode"); + oled_mode = of_property_read_bool(dev->of_node, "ti,oled-mode"); + + if (!of_property_read_u32(dev->of_node, + "ti,brightness-rate-of-change-us", + &rate_of_change)) { + switch (rate_of_change) { + case 51: + reg_gp_val = 0; + break; + case 13000: + reg_gp_val = BIT(REG_GP_RMP1_BIT); + break; + case 26000: + reg_gp_val = BIT(REG_GP_RMP0_BIT); + break; + case 52000: + reg_gp_val = BIT(REG_GP_RMP0_BIT) | + BIT(REG_GP_RMP1_BIT); + break; + default: + dev_warn(dev, "invalid rate of change %u\n", + rate_of_change); + break; + } + } + + if (unison_mode) + reg_gp_val |= BIT(REG_GP_UNI_BIT); + if (oled_mode) + reg_gp_val |= BIT(REG_GP_OLED_BIT); + + ret = regmap_write(data->regmap, REG_GP, reg_gp_val); + if (ret < 0) + return ret; + + max_brightness = min_t(u32, max_brightness, LM3509_MAX_BRIGHTNESS); + brightness = min_t(u32, brightness, max_brightness); + + data->bl_main = lm3509_backlight_register(dev, "main", data, + &lm3509_main_ops, brightness, + max_brightness); + if (IS_ERR(data->bl_main)) { + dev_err(dev, "fail : register main backlight\n"); + return PTR_ERR(data->bl_main); + } + + if (!unison_mode) { + data->bl_sub = lm3509_backlight_register(dev, "sub", data, + &lm3509_sub_ops, + brightness, + max_brightness); + if (IS_ERR(data->bl_sub)) { + dev_err(dev, "fail : register secondary backlight\n"); + return PTR_ERR(data->bl_sub); + } + } + + return 0; +} + +static void lm3509_remove(struct i2c_client *client) +{ + struct lm3509_bl *data = i2c_get_clientdata(client); + + regmap_write(data->regmap, REG_GP, 0x00); +} + +static const struct i2c_device_id lm3509_id[] = { { LM3509_NAME, 0 }, {} }; + +MODULE_DEVICE_TABLE(i2c, lm3509_id); + +static const struct of_device_id lm3509_match_table[] = { + { + .compatible = "ti,lm3509", + }, + {}, +}; + +MODULE_DEVICE_TABLE(of, lm3509_match_table); + +static struct i2c_driver lm3509_i2c_driver = { + .driver = { + .name = LM3509_NAME, + .of_match_table = lm3509_match_table, + }, + .probe = lm3509_probe, + .remove = lm3509_remove, + .id_table = lm3509_id, +}; + +module_i2c_driver(lm3509_i2c_driver); + +MODULE_DESCRIPTION("Texas Instruments Backlight driver for LM3509"); +MODULE_AUTHOR("Patrick Gansterer <paroga@xxxxxxxxxx>"); +MODULE_LICENSE("GPL"); -- 2.44.0
