From d9d50c0a2ea16ee03a127b08680907b4bf5c6e60 Mon Sep 17 00:00:00 2001 From: Philippe Simons Date: Sat, 5 Jul 2025 22:56:35 +0200 Subject: [PATCH] Add Silergy SY7758 backlight driver --- drivers/video/backlight/Kconfig | 8 ++ drivers/video/backlight/Makefile | 1 + drivers/video/backlight/sy7758.c | 167 +++++++++++++++++++++++++++++++ 3 files changed, 176 insertions(+) create mode 100644 drivers/video/backlight/sy7758.c diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig index d9374d208cee..35773c0f2a00 100644 --- a/drivers/video/backlight/Kconfig +++ b/drivers/video/backlight/Kconfig @@ -441,6 +441,14 @@ config BACKLIGHT_SKY81452 To compile this driver as a module, choose M here: the module will be called sky81452-backlight +config BACKLIGHT_SY7758 + tristate "Backlight Driver for Silergy SY7758" + depends on I2C + select REGMAP_I2C + help + Say Y to enable the backlight driver for the Silergy SY7758 + backlight controller. + config BACKLIGHT_TPS65217 tristate "TPS65217 Backlight" depends on MFD_TPS65217 diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile index dfbb169bf6ea..b187cd6024ef 100644 --- a/drivers/video/backlight/Makefile +++ b/drivers/video/backlight/Makefile @@ -55,6 +55,7 @@ obj-$(CONFIG_BACKLIGHT_QCOM_WLED) += qcom-wled.o obj-$(CONFIG_BACKLIGHT_RT4831) += rt4831-backlight.o obj-$(CONFIG_BACKLIGHT_SAHARA) += kb3886_bl.o obj-$(CONFIG_BACKLIGHT_SKY81452) += sky81452-backlight.o +obj-$(CONFIG_BACKLIGHT_SY7758) += sy7758.o obj-$(CONFIG_BACKLIGHT_TPS65217) += tps65217_bl.o obj-$(CONFIG_BACKLIGHT_WM831X) += wm831x_bl.o obj-$(CONFIG_BACKLIGHT_ARCXCNN) += arcxcnn_bl.o diff --git a/drivers/video/backlight/sy7758.c b/drivers/video/backlight/sy7758.c new file mode 100644 index 000000000000..7abad41b9641 --- /dev/null +++ b/drivers/video/backlight/sy7758.c @@ -0,0 +1,167 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Backlight driver for the Silergy sy7758 + * + * Copyright (C) 2025 Kancy Joe + */ + +#include +#include +#include +#include +#include +#include +#include + +#define DEFAULT_BRIGHTNESS 1500 +#define MAX_BRIGHTNESS 4080 +#define REG_MAX 0xa9 + +/* reg */ +#define BL_BRT_L 0x10 +#define BL_BRT_H 0x11 + +static DEFINE_MUTEX(sy7758_update_backlight_mutex); + +struct sy7758 { + struct i2c_client *client; + struct regmap *regmap; + bool led_on; +}; + +static void sy7758_init(struct sy7758 *sydev); + +static const struct regmap_config sy7758_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = REG_MAX, +}; + +static int sy7758_write(struct sy7758 *sydev, unsigned int reg, + unsigned int val) +{ + return regmap_write(sydev->regmap, reg, val); +} + +static int sy7758_backlight_update_status(struct backlight_device *backlight_dev) +{ + struct sy7758 *sydev = bl_get_data(backlight_dev); + unsigned int brightness = backlight_get_brightness(backlight_dev); + mutex_lock(&sy7758_update_backlight_mutex); + + if (!sydev->led_on && brightness > 0) { + // Init + sy7758_init(sydev); + sydev->led_on = true; + } else if (brightness == 0) { + sydev->led_on = false; + } + + /* Set brightness */ + sy7758_write(sydev, BL_BRT_L, brightness & 0xf0); + sy7758_write(sydev, BL_BRT_H, (brightness >> 8) & 0xf); + + mutex_unlock(&sy7758_update_backlight_mutex); + return 0; +} + +static const struct backlight_ops sy7758_backlight_ops = { + .options = BL_CORE_SUSPENDRESUME, + .update_status = sy7758_backlight_update_status, +}; + +static void sy7758_init(struct sy7758 *sydev) +{ + sy7758_write(sydev, 0x01, 0x85); + sy7758_write(sydev, 0x10, 0x00); + sy7758_write(sydev, 0x11, 0x00); + sy7758_write(sydev, 0xa5, 0x64); + sy7758_write(sydev, 0xa0, 0x55); + sy7758_write(sydev, 0xa1, 0x9a); + sy7758_write(sydev, 0xa9, 0x80); + sy7758_write(sydev, 0xa2, 0x28); + /* Wait init done */ + msleep(10); + sy7758_write(sydev, 0x10, 0x40); + sy7758_write(sydev, 0x11, 0x01); + // Max brightness + // 0x10: 0xf0 Low + // 0x11: 0x0f High + + // Min brightness + // 0x10: 0x10 Low + // 0x11: 0x00 High + sydev->led_on = true; +} + +static int sy7758_probe(struct i2c_client *client) +{ + struct backlight_device *backlight_dev; + struct backlight_properties props; + struct sy7758 *sydev; + + sydev = devm_kzalloc(&client->dev, sizeof(*sydev), GFP_KERNEL); + if (!sydev) + return -ENOMEM; + + sydev->client = client; + sydev->regmap = devm_regmap_init_i2c(client, &sy7758_regmap_config); + if (IS_ERR(sydev->regmap)) + return dev_err_probe(&client->dev, PTR_ERR(sydev->regmap), "failed to init regmap\n"); + + memset(&props, 0, sizeof(props)); + props.type = BACKLIGHT_RAW; + props.max_brightness = MAX_BRIGHTNESS; + props.brightness = DEFAULT_BRIGHTNESS; + props.scale = BACKLIGHT_SCALE_LINEAR; + + backlight_dev = devm_backlight_device_register(&client->dev, "sy7758-backlight", + &client->dev, sydev, &sy7758_backlight_ops, &props); + if (IS_ERR(backlight_dev)) + return dev_err_probe(&client->dev, PTR_ERR(backlight_dev), + "failed to register backlight device\n"); + + sy7758_init(sydev); + + i2c_set_clientdata(client, backlight_dev); + backlight_update_status(backlight_dev); + + return 0; +} + +static void sy7758_remove(struct i2c_client *client) +{ + struct backlight_device *backlight_dev = i2c_get_clientdata(client); + backlight_dev->props.brightness = 0; + backlight_update_status(backlight_dev); +} + +static const struct i2c_device_id sy7758_ids[] = { + { "sy7758" }, + {} +}; +MODULE_DEVICE_TABLE(i2c, sy7758_ids); + +static const struct of_device_id sy7758_match_table[] = { + { + .compatible = "silergy,sy7758", + }, + {}, +}; +MODULE_DEVICE_TABLE(of, sy7758_match_table); + +static struct i2c_driver sy7758_driver = { + .driver = { + .name = "sy7758", + .of_match_table = sy7758_match_table, + }, + .probe = sy7758_probe, + .remove = sy7758_remove, + .id_table = sy7758_ids, +}; + +module_i2c_driver(sy7758_driver); + +MODULE_DESCRIPTION("Silergy sy7758 Backlight Driver"); +MODULE_AUTHOR("Kancy Joe "); +MODULE_LICENSE("GPL"); -- 2.50.0