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