[PATCH 08/14] video: backlight: mt6370: Add Mediatek MT6370 support
ChiaEn Wu
peterwu.pub at gmail.com
Tue May 31 03:28:03 PDT 2022
From: ChiaEn Wu <chiaen_wu at richtek.com>
Add Mediatek MT6370 Backlight support.
Signed-off-by: ChiaEn Wu <chiaen_wu at richtek.com>
---
drivers/video/backlight/Kconfig | 8 +
drivers/video/backlight/Makefile | 1 +
drivers/video/backlight/mt6370-backlight.c | 338 +++++++++++++++++++++
3 files changed, 347 insertions(+)
create mode 100644 drivers/video/backlight/mt6370-backlight.c
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index a003e02e13ce..d9868fbe7488 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -268,6 +268,14 @@ config BACKLIGHT_MAX8925
If you have a LCD backlight connected to the WLED output of MAX8925
WLED output, say Y here to enable this driver.
+config BACKLIGHT_MT6370
+ tristate "Mediatek MT6370 Backlight Driver"
+ depends on MFD_MT6370
+ help
+ Say Y here to enable MT6370 Backlight support.
+ It's commonly used to drive the display WLED. There're 4 channels
+ inisde, and each channel can provide up to 30mA current.
+
config BACKLIGHT_APPLE
tristate "Apple Backlight Driver"
depends on X86 && ACPI
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index cae2c83422ae..e815f3f1deff 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -44,6 +44,7 @@ obj-$(CONFIG_BACKLIGHT_LP855X) += lp855x_bl.o
obj-$(CONFIG_BACKLIGHT_LP8788) += lp8788_bl.o
obj-$(CONFIG_BACKLIGHT_LV5207LP) += lv5207lp.o
obj-$(CONFIG_BACKLIGHT_MAX8925) += max8925_bl.o
+obj-$(CONFIG_BACKLIGHT_MT6370) += mt6370-backlight.o
obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o
obj-$(CONFIG_BACKLIGHT_PANDORA) += pandora_bl.o
obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o
diff --git a/drivers/video/backlight/mt6370-backlight.c b/drivers/video/backlight/mt6370-backlight.c
new file mode 100644
index 000000000000..f8a8d33203ed
--- /dev/null
+++ b/drivers/video/backlight/mt6370-backlight.c
@@ -0,0 +1,338 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/backlight.h>
+#include <linux/bitfield.h>
+#include <linux/bits.h>
+#include <linux/gpio/consumer.h>
+#include <linux/gpio/driver.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define MT6370_REG_DEV_INFO 0x100
+#define MT6370_REG_BL_EN 0x1A0
+#define MT6370_REG_BL_BSTCTRL 0x1A1
+#define MT6370_REG_BL_PWM 0x1A2
+#define MT6370_REG_BL_DIM2 0x1A4
+
+#define MT6370_VENID_MASK GENMASK(7, 4)
+#define MT6370_BL_EXT_EN_MASK BIT(7)
+#define MT6370_BL_EN_MASK BIT(6)
+#define MT6370_BL_CONFIG_MASK BIT(0)
+#define MT6370_BL_CH_MASK GENMASK(5, 2)
+#define MT6370_BL_DIM2_MASK GENMASK(2, 0)
+#define MT6370_BL_DUMMY_6372_MASK GENMASK(2, 0)
+#define MT6370_BL_DIM2_6372_SHIFT 3
+#define MT6370_BL_PWM_EN_MASK BIT(7)
+#define MT6370_BL_PWM_HYS_EN_MASK BIT(2)
+#define MT6370_BL_PWM_HYS_SEL_MASK GENMASK(1, 0)
+#define MT6370_BL_OVP_EN_MASK BIT(7)
+#define MT6370_BL_OVP_SEL_MASK GENMASK(6, 5)
+#define MT6370_BL_OC_EN_MASK BIT(3)
+#define MT6370_BL_OC_SEL_MASK GENMASK(2, 1)
+
+#define MT6370_BL_MAX_BRIGHTNESS 2048
+
+enum {
+ MT6370_VID_COMMON = 0,
+ MT6370_VID_6372,
+ MT6370_VID_MAX,
+};
+
+enum mt6370_prop_type {
+ MT6370_PARSE_TYPE_BOOL = 0,
+ MT6370_PARSE_TYPE_U8,
+ MT6370_PARSE_TYPE_MAX,
+};
+
+struct mt6370_priv {
+ int vid_type;
+ struct backlight_device *bl;
+ struct device *dev;
+ struct gpio_desc *enable_gpio;
+ struct regmap *regmap;
+};
+
+static int mt6370_bl_update_status(struct backlight_device *bl_dev)
+{
+ struct mt6370_priv *priv = bl_get_data(bl_dev);
+ int brightness = backlight_get_brightness(bl_dev);
+ unsigned int enable_val;
+ u8 brightness_val[2];
+ int ret;
+
+ if (brightness) {
+ brightness_val[0] = (brightness - 1) & MT6370_BL_DIM2_MASK;
+ brightness_val[1] = (brightness - 1)
+ >> fls(MT6370_BL_DIM2_MASK);
+
+ if (priv->vid_type == MT6370_VID_6372) {
+ brightness_val[0] <<= MT6370_BL_DIM2_6372_SHIFT;
+ brightness_val[0] |= MT6370_BL_DUMMY_6372_MASK;
+ }
+
+ ret = regmap_raw_write(priv->regmap, MT6370_REG_BL_DIM2,
+ brightness_val, sizeof(brightness_val));
+ if (ret)
+ return ret;
+ }
+
+ if (priv->enable_gpio)
+ gpiod_set_value(priv->enable_gpio, brightness ? 1 : 0);
+
+ enable_val = brightness ? MT6370_BL_EN_MASK : 0;
+ return regmap_update_bits(priv->regmap, MT6370_REG_BL_EN,
+ MT6370_BL_EN_MASK, enable_val);
+}
+
+static int mt6370_bl_get_brightness(struct backlight_device *bl_dev)
+{
+ struct mt6370_priv *priv = bl_get_data(bl_dev);
+ unsigned int enable;
+ u8 brightness_val[2];
+ int brightness, ret;
+
+ ret = regmap_read(priv->regmap, MT6370_REG_BL_EN, &enable);
+ if (ret)
+ return ret;
+
+ if (!(enable & MT6370_BL_EN_MASK))
+ return 0;
+
+ ret = regmap_raw_read(priv->regmap, MT6370_REG_BL_DIM2,
+ brightness_val, sizeof(brightness_val));
+ if (ret)
+ return ret;
+
+ if (priv->vid_type == MT6370_VID_6372)
+ brightness_val[0] >>= MT6370_BL_DIM2_6372_SHIFT;
+
+ brightness = brightness_val[1] << fls(MT6370_BL_DIM2_MASK);
+ brightness += (brightness_val[0] & MT6370_BL_DIM2_MASK);
+
+ return brightness + 1;
+}
+
+static const struct backlight_ops mt6370_bl_ops = {
+ .options = BL_CORE_SUSPENDRESUME,
+ .update_status = mt6370_bl_update_status,
+ .get_brightness = mt6370_bl_get_brightness,
+};
+
+#define MT6370_DT_PROP_DECL(_name, _type, _reg, _mask, _max, _inv) \
+{ \
+ .name = "mediatek,bled-" #_name, \
+ .type = MT6370_PARSE_TYPE_##_type, \
+ .reg = _reg, \
+ .mask = _mask, \
+ .max_val = _max, \
+ .invert = _inv, \
+}
+
+static int mt6370_init_backlight_properties(struct mt6370_priv *priv,
+ struct backlight_properties *props)
+{
+ struct device *dev = priv->dev;
+ u8 prop_val;
+ u32 brightness;
+ unsigned int mask, val;
+ static const struct {
+ char *name;
+ enum mt6370_prop_type type;
+ unsigned int reg;
+ unsigned int mask;
+ u8 max_val;
+ bool invert;
+ } vendor_opt_props[] = {
+ MT6370_DT_PROP_DECL(pwm-enable, BOOL, MT6370_REG_BL_PWM,
+ MT6370_BL_PWM_EN_MASK, 1, false),
+ MT6370_DT_PROP_DECL(pwm-hys-enable, BOOL, MT6370_REG_BL_PWM,
+ MT6370_BL_PWM_HYS_EN_MASK, 1, false),
+ MT6370_DT_PROP_DECL(pwm-hys-sel, U8, MT6370_REG_BL_PWM,
+ MT6370_BL_PWM_HYS_SEL_MASK, 3, false),
+ MT6370_DT_PROP_DECL(ovp-level-sel, U8, MT6370_REG_BL_BSTCTRL,
+ MT6370_BL_OVP_SEL_MASK, 3, false),
+ MT6370_DT_PROP_DECL(ovp-shutdown, BOOL, MT6370_REG_BL_BSTCTRL,
+ MT6370_BL_OVP_EN_MASK, 1, true),
+ MT6370_DT_PROP_DECL(ocp-level-sel, U8, MT6370_REG_BL_BSTCTRL,
+ MT6370_BL_OC_SEL_MASK, 3, false),
+ MT6370_DT_PROP_DECL(ocp-shutdown, BOOL, MT6370_REG_BL_BSTCTRL,
+ MT6370_BL_OC_EN_MASK, 1, true),
+ }, *prop_now;
+ int i, ret;
+
+ /* vendor optional properties */
+ for (i = 0; i < ARRAY_SIZE(vendor_opt_props); i++) {
+ prop_now = vendor_opt_props + i;
+
+ switch (prop_now->type) {
+ case MT6370_PARSE_TYPE_BOOL:
+ if (device_property_read_bool(dev, prop_now->name))
+ val = 1;
+ else
+ val = 0;
+ break;
+ case MT6370_PARSE_TYPE_U8:
+ ret = device_property_read_u8(dev, prop_now->name,
+ &prop_val);
+ /* Property not exist, keep value in default */
+ if (ret)
+ continue;
+
+ val = min_t(u8, prop_val, prop_now->max_val);
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (prop_now->invert)
+ val = prop_now->max_val - val;
+
+ val <<= ffs(prop_now->mask) - 1;
+
+ ret = regmap_update_bits(priv->regmap, prop_now->reg,
+ prop_now->mask, val);
+ if (ret)
+ return ret;
+ }
+
+ /* common properties */
+ ret = device_property_read_u32(dev, "max-brightness", &brightness);
+ if (ret)
+ brightness = MT6370_BL_MAX_BRIGHTNESS;
+
+ props->max_brightness = min_t(u32, brightness,
+ MT6370_BL_MAX_BRIGHTNESS);
+
+ ret = device_property_read_u32(dev, "default-brightness", &brightness);
+ if (ret)
+ brightness = props->max_brightness;
+
+ props->brightness = min_t(u32, brightness, props->max_brightness);
+
+
+ ret = device_property_read_u8(dev, "mediatek,bled-channel-use",
+ &prop_val);
+ if (ret) {
+ dev_err(dev, "mediatek,bled-channel-use DT property missing\n");
+ return ret;
+ }
+
+ if (!prop_val) {
+ dev_err(dev, "No channel specified\n");
+ return -EINVAL;
+ }
+
+ mask = MT6370_BL_EXT_EN_MASK | MT6370_BL_CH_MASK;
+ val = prop_val << (ffs(MT6370_BL_CH_MASK) - 1);
+
+ if (priv->enable_gpio)
+ val |= MT6370_BL_EXT_EN_MASK;
+
+ return regmap_update_bits(priv->regmap, MT6370_REG_BL_EN, mask, val);
+}
+
+static int mt6370_check_vendor_info(struct mt6370_priv *priv)
+{
+ unsigned int dev_info, vid;
+ int ret;
+
+ ret = regmap_read(priv->regmap, MT6370_REG_DEV_INFO, &dev_info);
+ if (ret)
+ return ret;
+
+ vid = FIELD_GET(MT6370_VENID_MASK, dev_info);
+ if (vid == 0x9 || vid == 0xb)
+ priv->vid_type = MT6370_VID_6372;
+ else
+ priv->vid_type = MT6370_VID_COMMON;
+
+ return 0;
+}
+
+static int mt6370_bl_probe(struct platform_device *pdev)
+{
+ struct mt6370_priv *priv;
+ struct backlight_properties props = {
+ .type = BACKLIGHT_RAW,
+ .scale = BACKLIGHT_SCALE_LINEAR,
+ };
+ int ret;
+
+ priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->dev = &pdev->dev;
+
+ priv->regmap = dev_get_regmap(pdev->dev.parent, NULL);
+ if (!priv->regmap) {
+ dev_err(&pdev->dev, "Failed to get regmap\n");
+ return -ENODEV;
+ }
+
+ ret = mt6370_check_vendor_info(priv);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to check vendor info (%d)\n", ret);
+ return ret;
+ }
+
+ priv->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(priv->enable_gpio)) {
+ dev_err(&pdev->dev, "Failed to get 'enable' gpio\n");
+ return PTR_ERR(priv->enable_gpio);
+ }
+
+ ret = mt6370_init_backlight_properties(priv, &props);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to init backlight properties\n");
+ return ret;
+ }
+
+ priv->bl = devm_backlight_device_register(&pdev->dev, pdev->name,
+ &pdev->dev, priv,
+ &mt6370_bl_ops, &props);
+ if (IS_ERR(priv->bl)) {
+ dev_err(&pdev->dev, "Failed to register backlight\n");
+ return PTR_ERR(priv->bl);
+ }
+
+ backlight_update_status(priv->bl);
+ platform_set_drvdata(pdev, priv);
+
+ return 0;
+}
+
+static int mt6370_bl_remove(struct platform_device *pdev)
+{
+ struct mt6370_priv *priv = platform_get_drvdata(pdev);
+ struct backlight_device *bl_dev = priv->bl;
+
+ bl_dev->props.brightness = 0;
+ backlight_update_status(priv->bl);
+
+ return 0;
+}
+
+static const struct of_device_id __maybe_unused mt6370_bl_of_match[] = {
+ { .compatible = "mediatek,mt6370-backlight", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, mt6370_bl_of_match);
+
+static struct platform_driver mt6370_bl_driver = {
+ .driver = {
+ .name = "mt6370-backlight",
+ .of_match_table = mt6370_bl_of_match,
+ },
+ .probe = mt6370_bl_probe,
+ .remove = mt6370_bl_remove,
+};
+module_platform_driver(mt6370_bl_driver);
+
+MODULE_AUTHOR("ChiaEn Wu <chiaen_wu at richtek.com>");
+MODULE_DESCRIPTION("Mediatek MT6370 Backlight Driver");
+MODULE_LICENSE("GPL v2");
--
2.25.1
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