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-rw-r--r--Documentation/devicetree/bindings/video/backlight/gpio-backlight.txt16
-rw-r--r--drivers/video/backlight/backlight.c2
-rw-r--r--drivers/video/backlight/gpio_backlight.c58
-rw-r--r--drivers/video/backlight/lm3639_bl.c17
4 files changed, 75 insertions, 18 deletions
diff --git a/Documentation/devicetree/bindings/video/backlight/gpio-backlight.txt b/Documentation/devicetree/bindings/video/backlight/gpio-backlight.txt
new file mode 100644
index 000000000000..321be6640533
--- /dev/null
+++ b/Documentation/devicetree/bindings/video/backlight/gpio-backlight.txt
@@ -0,0 +1,16 @@
+gpio-backlight bindings
+
+Required properties:
+ - compatible: "gpio-backlight"
+ - gpios: describes the gpio that is used for enabling/disabling the backlight.
+ refer to bindings/gpio/gpio.txt for more details.
+
+Optional properties:
+ - default-on: enable the backlight at boot.
+
+Example:
+ backlight {
+ compatible = "gpio-backlight";
+ gpios = <&gpio3 4 GPIO_ACTIVE_HIGH>;
+ default-on;
+ };
diff --git a/drivers/video/backlight/backlight.c b/drivers/video/backlight/backlight.c
index 27d3cf255e78..bd2172c2d650 100644
--- a/drivers/video/backlight/backlight.c
+++ b/drivers/video/backlight/backlight.c
@@ -347,7 +347,7 @@ struct backlight_device *backlight_device_register(const char *name,
rc = device_register(&new_bd->dev);
if (rc) {
- kfree(new_bd);
+ put_device(&new_bd->dev);
return ERR_PTR(rc);
}
diff --git a/drivers/video/backlight/gpio_backlight.c b/drivers/video/backlight/gpio_backlight.c
index 81fb12770c2a..a2eba12e1cb7 100644
--- a/drivers/video/backlight/gpio_backlight.c
+++ b/drivers/video/backlight/gpio_backlight.c
@@ -13,6 +13,8 @@
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
#include <linux/platform_data/gpio_backlight.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
@@ -23,6 +25,7 @@ struct gpio_backlight {
int gpio;
int active;
+ int def_value;
};
static int gpio_backlight_update_status(struct backlight_device *bl)
@@ -60,6 +63,29 @@ static const struct backlight_ops gpio_backlight_ops = {
.check_fb = gpio_backlight_check_fb,
};
+static int gpio_backlight_probe_dt(struct platform_device *pdev,
+ struct gpio_backlight *gbl)
+{
+ struct device_node *np = pdev->dev.of_node;
+ enum of_gpio_flags gpio_flags;
+
+ gbl->gpio = of_get_gpio_flags(np, 0, &gpio_flags);
+
+ if (!gpio_is_valid(gbl->gpio)) {
+ if (gbl->gpio != -EPROBE_DEFER) {
+ dev_err(&pdev->dev,
+ "Error: The gpios parameter is missing or invalid.\n");
+ }
+ return gbl->gpio;
+ }
+
+ gbl->active = (gpio_flags & OF_GPIO_ACTIVE_LOW) ? 0 : 1;
+
+ gbl->def_value = of_property_read_bool(np, "default-on");
+
+ return 0;
+}
+
static int gpio_backlight_probe(struct platform_device *pdev)
{
struct gpio_backlight_platform_data *pdata =
@@ -67,10 +93,12 @@ static int gpio_backlight_probe(struct platform_device *pdev)
struct backlight_properties props;
struct backlight_device *bl;
struct gpio_backlight *gbl;
+ struct device_node *np = pdev->dev.of_node;
int ret;
- if (!pdata) {
- dev_err(&pdev->dev, "failed to find platform data\n");
+ if (!pdata && !np) {
+ dev_err(&pdev->dev,
+ "failed to find platform data or device tree node.\n");
return -ENODEV;
}
@@ -79,14 +107,22 @@ static int gpio_backlight_probe(struct platform_device *pdev)
return -ENOMEM;
gbl->dev = &pdev->dev;
- gbl->fbdev = pdata->fbdev;
- gbl->gpio = pdata->gpio;
- gbl->active = pdata->active_low ? 0 : 1;
+
+ if (np) {
+ ret = gpio_backlight_probe_dt(pdev, gbl);
+ if (ret)
+ return ret;
+ } else {
+ gbl->fbdev = pdata->fbdev;
+ gbl->gpio = pdata->gpio;
+ gbl->active = pdata->active_low ? 0 : 1;
+ gbl->def_value = pdata->def_value;
+ }
ret = devm_gpio_request_one(gbl->dev, gbl->gpio, GPIOF_DIR_OUT |
(gbl->active ? GPIOF_INIT_LOW
: GPIOF_INIT_HIGH),
- pdata->name);
+ pdata ? pdata->name : "backlight");
if (ret < 0) {
dev_err(&pdev->dev, "unable to request GPIO\n");
return ret;
@@ -103,17 +139,25 @@ static int gpio_backlight_probe(struct platform_device *pdev)
return PTR_ERR(bl);
}
- bl->props.brightness = pdata->def_value;
+ bl->props.brightness = gbl->def_value;
backlight_update_status(bl);
platform_set_drvdata(pdev, bl);
return 0;
}
+#ifdef CONFIG_OF
+static struct of_device_id gpio_backlight_of_match[] = {
+ { .compatible = "gpio-backlight" },
+ { /* sentinel */ }
+};
+#endif
+
static struct platform_driver gpio_backlight_driver = {
.driver = {
.name = "gpio-backlight",
.owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(gpio_backlight_of_match),
},
.probe = gpio_backlight_probe,
};
diff --git a/drivers/video/backlight/lm3639_bl.c b/drivers/video/backlight/lm3639_bl.c
index 6fd60adf922e..5f36808d214f 100644
--- a/drivers/video/backlight/lm3639_bl.c
+++ b/drivers/video/backlight/lm3639_bl.c
@@ -349,8 +349,9 @@ static int lm3639_probe(struct i2c_client *client,
props.brightness = pdata->init_brt_led;
props.max_brightness = pdata->max_brt_led;
pchip->bled =
- backlight_device_register("lm3639_bled", pchip->dev, pchip,
- &lm3639_bled_ops, &props);
+ devm_backlight_device_register(pchip->dev, "lm3639_bled",
+ pchip->dev, pchip, &lm3639_bled_ops,
+ &props);
if (IS_ERR(pchip->bled)) {
dev_err(&client->dev, "fail : backlight register\n");
ret = PTR_ERR(pchip->bled);
@@ -360,7 +361,7 @@ static int lm3639_probe(struct i2c_client *client,
ret = device_create_file(&(pchip->bled->dev), &dev_attr_bled_mode);
if (ret < 0) {
dev_err(&client->dev, "failed : add sysfs entries\n");
- goto err_bled_mode;
+ goto err_out;
}
/* flash */
@@ -391,8 +392,6 @@ err_torch:
led_classdev_unregister(&pchip->cdev_flash);
err_flash:
device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode);
-err_bled_mode:
- backlight_device_unregister(pchip->bled);
err_out:
return ret;
}
@@ -407,10 +406,8 @@ static int lm3639_remove(struct i2c_client *client)
led_classdev_unregister(&pchip->cdev_torch);
if (&pchip->cdev_flash)
led_classdev_unregister(&pchip->cdev_flash);
- if (pchip->bled) {
+ if (pchip->bled)
device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode);
- backlight_device_unregister(pchip->bled);
- }
return 0;
}
@@ -432,6 +429,6 @@ static struct i2c_driver lm3639_i2c_driver = {
module_i2c_driver(lm3639_i2c_driver);
MODULE_DESCRIPTION("Texas Instruments Backlight+Flash LED driver for LM3639");
-MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
-MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
+MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
+MODULE_AUTHOR("Ldd Mlp <ldd-mlp@list.ti.com>");
MODULE_LICENSE("GPL v2");

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