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authorLinus Torvalds <torvalds@linux-foundation.org>2021-07-05 22:16:00 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-07-05 22:16:00 +0300
commit3f8b8e7dbd79086ad48fcff33de9399f3da66a69 (patch)
treecb1fbdd3e2c3a58b873bb7dd77ec32efda2f9f17 /drivers
parent463c09d09d426d4dfe1a83e1461e28d6b2d7f66a (diff)
parent1181f2164135d770bdad297290b73d274787389b (diff)
downloadlinux-3f8b8e7dbd79086ad48fcff33de9399f3da66a69.tar.xz
Merge tag 'backlight-next-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight
Pull backlight updates from Lee Jones: "New Drivers: - Add support for Richtek RT4831 Backlight New Device Support: - Add support for Qualcomm PMI8994 WLED Backlight Fix-ups: - Device Tree adaptions to richtek,rt4831-backlight - Trivial spelling, whitespace, etc in Kconfig - Use Atomic PWM API in lm3630a_bl Bug Fixes: - Fix Firmware Node Leak in error path in lm3630a_bl - Fix erroneous return codes in lm3630a_bl" * tag 'backlight-next-5.14' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight: backlight: lm3630a: Convert to atomic PWM API and check for errors backlight: lm3630a: Fix return code of .update_status() callback backlight: Kconfig whitespace and indentation cleanups video: backlight: qcom-wled: Add PMI8994 compatible backlight: rt4831: Adds support for Richtek RT4831 backlight backlight: rt4831: Adds DT binding document for Richtek RT4831 backlight backlight: lm3630a_bl: Put fwnode in error case during ->probe()
Diffstat (limited to 'drivers')
-rw-r--r--drivers/video/backlight/Kconfig30
-rw-r--r--drivers/video/backlight/Makefile1
-rw-r--r--drivers/video/backlight/lm3630a_bl.c54
-rw-r--r--drivers/video/backlight/qcom-wled.c1
-rw-r--r--drivers/video/backlight/rt4831-backlight.c203
5 files changed, 250 insertions, 39 deletions
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index d83c87b902c1..e32694c13da5 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -128,12 +128,12 @@ config LCD_HX8357
If you have a HX-8357 LCD panel, say Y to enable its LCD control
driver.
- config LCD_OTM3225A
- tristate "ORISE Technology OTM3225A support"
- depends on SPI
- help
- If you have a panel based on the OTM3225A controller
- chip then say y to include a driver for it.
+config LCD_OTM3225A
+ tristate "ORISE Technology OTM3225A support"
+ depends on SPI
+ help
+ If you have a panel based on the OTM3225A controller
+ chip then say y to include a driver for it.
endif # LCD_CLASS_DEVICE
@@ -269,11 +269,11 @@ config BACKLIGHT_MAX8925
WLED output, say Y here to enable this driver.
config BACKLIGHT_APPLE
- tristate "Apple Backlight Driver"
- depends on X86 && ACPI
- help
- If you have an Intel-based Apple say Y to enable a driver for its
- backlight.
+ tristate "Apple Backlight Driver"
+ depends on X86 && ACPI
+ help
+ If you have an Intel-based Apple say Y to enable a driver for its
+ backlight.
config BACKLIGHT_TOSA
tristate "Sharp SL-6000 Backlight Driver"
@@ -289,6 +289,14 @@ config BACKLIGHT_QCOM_WLED
If you have the Qualcomm PMIC, say Y to enable a driver for the
WLED block. Currently it supports PM8941 and PMI8998.
+config BACKLIGHT_RT4831
+ tristate "Richtek RT4831 Backlight Driver"
+ depends on MFD_RT4831
+ help
+ This enables support for Richtek RT4831 Backlight driver.
+ It's commonly used to drive the display WLED. There're four channels
+ inisde, and each channel can provide up to 30mA current.
+
config BACKLIGHT_SAHARA
tristate "Tabletkiosk Sahara Touch-iT Backlight Driver"
depends on X86
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index 685f3f1ca4df..cae2c83422ae 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -49,6 +49,7 @@ obj-$(CONFIG_BACKLIGHT_PANDORA) += pandora_bl.o
obj-$(CONFIG_BACKLIGHT_PCF50633) += pcf50633-backlight.o
obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o
obj-$(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_TOSA) += tosa_bl.o
diff --git a/drivers/video/backlight/lm3630a_bl.c b/drivers/video/backlight/lm3630a_bl.c
index e88a2b0e5904..e8b185bb6f5e 100644
--- a/drivers/video/backlight/lm3630a_bl.c
+++ b/drivers/video/backlight/lm3630a_bl.c
@@ -52,6 +52,7 @@ struct lm3630a_chip {
struct gpio_desc *enable_gpio;
struct regmap *regmap;
struct pwm_device *pwmd;
+ struct pwm_state pwmd_state;
};
/* i2c access */
@@ -167,16 +168,19 @@ static int lm3630a_intr_config(struct lm3630a_chip *pchip)
return rval;
}
-static void lm3630a_pwm_ctrl(struct lm3630a_chip *pchip, int br, int br_max)
+static int lm3630a_pwm_ctrl(struct lm3630a_chip *pchip, int br, int br_max)
{
- unsigned int period = pchip->pdata->pwm_period;
- unsigned int duty = br * period / br_max;
+ int err;
- pwm_config(pchip->pwmd, duty, period);
- if (duty)
- pwm_enable(pchip->pwmd);
- else
- pwm_disable(pchip->pwmd);
+ pchip->pwmd_state.period = pchip->pdata->pwm_period;
+
+ err = pwm_set_relative_duty_cycle(&pchip->pwmd_state, br, br_max);
+ if (err)
+ return err;
+
+ pchip->pwmd_state.enabled = pchip->pwmd_state.duty_cycle ? true : false;
+
+ return pwm_apply_state(pchip->pwmd, &pchip->pwmd_state);
}
/* update and get brightness */
@@ -187,11 +191,9 @@ static int lm3630a_bank_a_update_status(struct backlight_device *bl)
enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
/* pwm control */
- if ((pwm_ctrl & LM3630A_PWM_BANK_A) != 0) {
- lm3630a_pwm_ctrl(pchip, bl->props.brightness,
- bl->props.max_brightness);
- return bl->props.brightness;
- }
+ if ((pwm_ctrl & LM3630A_PWM_BANK_A) != 0)
+ return lm3630a_pwm_ctrl(pchip, bl->props.brightness,
+ bl->props.max_brightness);
/* disable sleep */
ret = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
@@ -210,8 +212,8 @@ static int lm3630a_bank_a_update_status(struct backlight_device *bl)
return 0;
out_i2c_err:
- dev_err(pchip->dev, "i2c failed to access\n");
- return bl->props.brightness;
+ dev_err(pchip->dev, "i2c failed to access (%pe)\n", ERR_PTR(ret));
+ return ret;
}
static int lm3630a_bank_a_get_brightness(struct backlight_device *bl)
@@ -264,11 +266,9 @@ static int lm3630a_bank_b_update_status(struct backlight_device *bl)
enum lm3630a_pwm_ctrl pwm_ctrl = pchip->pdata->pwm_ctrl;
/* pwm control */
- if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0) {
- lm3630a_pwm_ctrl(pchip, bl->props.brightness,
- bl->props.max_brightness);
- return bl->props.brightness;
- }
+ if ((pwm_ctrl & LM3630A_PWM_BANK_B) != 0)
+ return lm3630a_pwm_ctrl(pchip, bl->props.brightness,
+ bl->props.max_brightness);
/* disable sleep */
ret = lm3630a_update(pchip, REG_CTRL, 0x80, 0x00);
@@ -287,8 +287,8 @@ static int lm3630a_bank_b_update_status(struct backlight_device *bl)
return 0;
out_i2c_err:
- dev_err(pchip->dev, "i2c failed to access REG_CTRL\n");
- return bl->props.brightness;
+ dev_err(pchip->dev, "i2c failed to access (%pe)\n", ERR_PTR(ret));
+ return ret;
}
static int lm3630a_bank_b_get_brightness(struct backlight_device *bl)
@@ -482,8 +482,10 @@ static int lm3630a_parse_node(struct lm3630a_chip *pchip,
device_for_each_child_node(pchip->dev, node) {
ret = lm3630a_parse_bank(pdata, node, &seen_led_sources);
- if (ret)
+ if (ret) {
+ fwnode_handle_put(node);
return ret;
+ }
}
return ret;
@@ -563,11 +565,7 @@ static int lm3630a_probe(struct i2c_client *client,
return PTR_ERR(pchip->pwmd);
}
- /*
- * FIXME: pwm_apply_args() should be removed when switching to
- * the atomic PWM API.
- */
- pwm_apply_args(pchip->pwmd);
+ pwm_init_state(pchip->pwmd, &pchip->pwmd_state);
}
/* interrupt enable : irq 0 is not allowed */
diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
index 7c02f87c51c2..d094299c2a48 100644
--- a/drivers/video/backlight/qcom-wled.c
+++ b/drivers/video/backlight/qcom-wled.c
@@ -1717,6 +1717,7 @@ static int wled_remove(struct platform_device *pdev)
static const struct of_device_id wled_match_table[] = {
{ .compatible = "qcom,pm8941-wled", .data = (void *)3 },
+ { .compatible = "qcom,pmi8994-wled", .data = (void *)4 },
{ .compatible = "qcom,pmi8998-wled", .data = (void *)4 },
{ .compatible = "qcom,pm660l-wled", .data = (void *)4 },
{ .compatible = "qcom,pm8150l-wled", .data = (void *)5 },
diff --git a/drivers/video/backlight/rt4831-backlight.c b/drivers/video/backlight/rt4831-backlight.c
new file mode 100644
index 000000000000..42155c7d2db1
--- /dev/null
+++ b/drivers/video/backlight/rt4831-backlight.c
@@ -0,0 +1,203 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <dt-bindings/leds/rt4831-backlight.h>
+#include <linux/backlight.h>
+#include <linux/bitops.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+#include <linux/regmap.h>
+
+#define RT4831_REG_BLCFG 0x02
+#define RT4831_REG_BLDIML 0x04
+#define RT4831_REG_ENABLE 0x08
+
+#define RT4831_BLMAX_BRIGHTNESS 2048
+
+#define RT4831_BLOVP_MASK GENMASK(7, 5)
+#define RT4831_BLOVP_SHIFT 5
+#define RT4831_BLPWMEN_MASK BIT(0)
+#define RT4831_BLEN_MASK BIT(4)
+#define RT4831_BLCH_MASK GENMASK(3, 0)
+#define RT4831_BLDIML_MASK GENMASK(2, 0)
+#define RT4831_BLDIMH_MASK GENMASK(10, 3)
+#define RT4831_BLDIMH_SHIFT 3
+
+struct rt4831_priv {
+ struct device *dev;
+ struct regmap *regmap;
+ struct backlight_device *bl;
+};
+
+static int rt4831_bl_update_status(struct backlight_device *bl_dev)
+{
+ struct rt4831_priv *priv = bl_get_data(bl_dev);
+ int brightness = backlight_get_brightness(bl_dev);
+ unsigned int enable = brightness ? RT4831_BLEN_MASK : 0;
+ u8 v[2];
+ int ret;
+
+ if (brightness) {
+ v[0] = (brightness - 1) & RT4831_BLDIML_MASK;
+ v[1] = ((brightness - 1) & RT4831_BLDIMH_MASK) >> RT4831_BLDIMH_SHIFT;
+
+ ret = regmap_raw_write(priv->regmap, RT4831_REG_BLDIML, v, sizeof(v));
+ if (ret)
+ return ret;
+ }
+
+ return regmap_update_bits(priv->regmap, RT4831_REG_ENABLE, RT4831_BLEN_MASK, enable);
+
+}
+
+static int rt4831_bl_get_brightness(struct backlight_device *bl_dev)
+{
+ struct rt4831_priv *priv = bl_get_data(bl_dev);
+ unsigned int val;
+ u8 v[2];
+ int ret;
+
+ ret = regmap_read(priv->regmap, RT4831_REG_ENABLE, &val);
+ if (ret)
+ return ret;
+
+ if (!(val & RT4831_BLEN_MASK))
+ return 0;
+
+ ret = regmap_raw_read(priv->regmap, RT4831_REG_BLDIML, v, sizeof(v));
+ if (ret)
+ return ret;
+
+ ret = (v[1] << RT4831_BLDIMH_SHIFT) + (v[0] & RT4831_BLDIML_MASK) + 1;
+
+ return ret;
+}
+
+static const struct backlight_ops rt4831_bl_ops = {
+ .options = BL_CORE_SUSPENDRESUME,
+ .update_status = rt4831_bl_update_status,
+ .get_brightness = rt4831_bl_get_brightness,
+};
+
+static int rt4831_parse_backlight_properties(struct rt4831_priv *priv,
+ struct backlight_properties *bl_props)
+{
+ struct device *dev = priv->dev;
+ u8 propval;
+ u32 brightness;
+ unsigned int val = 0;
+ int ret;
+
+ /* common properties */
+ ret = device_property_read_u32(dev, "max-brightness", &brightness);
+ if (ret)
+ brightness = RT4831_BLMAX_BRIGHTNESS;
+
+ bl_props->max_brightness = min_t(u32, brightness, RT4831_BLMAX_BRIGHTNESS);
+
+ ret = device_property_read_u32(dev, "default-brightness", &brightness);
+ if (ret)
+ brightness = bl_props->max_brightness;
+
+ bl_props->brightness = min_t(u32, brightness, bl_props->max_brightness);
+
+ /* vendor properties */
+ if (device_property_read_bool(dev, "richtek,pwm-enable"))
+ val = RT4831_BLPWMEN_MASK;
+
+ ret = regmap_update_bits(priv->regmap, RT4831_REG_BLCFG, RT4831_BLPWMEN_MASK, val);
+ if (ret)
+ return ret;
+
+ ret = device_property_read_u8(dev, "richtek,bled-ovp-sel", &propval);
+ if (ret)
+ propval = RT4831_BLOVPLVL_21V;
+
+ propval = min_t(u8, propval, RT4831_BLOVPLVL_29V);
+ ret = regmap_update_bits(priv->regmap, RT4831_REG_BLCFG, RT4831_BLOVP_MASK,
+ propval << RT4831_BLOVP_SHIFT);
+ if (ret)
+ return ret;
+
+ ret = device_property_read_u8(dev, "richtek,channel-use", &propval);
+ if (ret) {
+ dev_err(dev, "richtek,channel-use DT property missing\n");
+ return ret;
+ }
+
+ if (!(propval & RT4831_BLCH_MASK)) {
+ dev_err(dev, "No channel specified\n");
+ return -EINVAL;
+ }
+
+ return regmap_update_bits(priv->regmap, RT4831_REG_ENABLE, RT4831_BLCH_MASK, propval);
+}
+
+static int rt4831_bl_probe(struct platform_device *pdev)
+{
+ struct rt4831_priv *priv;
+ struct backlight_properties bl_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 init regmap\n");
+ return -ENODEV;
+ }
+
+ ret = rt4831_parse_backlight_properties(priv, &bl_props);
+ if (ret) {
+ dev_err(&pdev->dev, "Failed to parse backlight properties\n");
+ return ret;
+ }
+
+ priv->bl = devm_backlight_device_register(&pdev->dev, pdev->name, &pdev->dev, priv,
+ &rt4831_bl_ops, &bl_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 rt4831_bl_remove(struct platform_device *pdev)
+{
+ struct rt4831_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 rt4831_bl_of_match[] = {
+ { .compatible = "richtek,rt4831-backlight", },
+ {}
+};
+MODULE_DEVICE_TABLE(of, rt4831_bl_of_match);
+
+static struct platform_driver rt4831_bl_driver = {
+ .driver = {
+ .name = "rt4831-backlight",
+ .of_match_table = rt4831_bl_of_match,
+ },
+ .probe = rt4831_bl_probe,
+ .remove = rt4831_bl_remove,
+};
+module_platform_driver(rt4831_bl_driver);
+
+MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
+MODULE_LICENSE("GPL v2");