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path: root/drivers/leds/leds-gpio.c
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Diffstat (limited to 'drivers/leds/leds-gpio.c')
-rw-r--r--drivers/leds/leds-gpio.c106
1 files changed, 48 insertions, 58 deletions
diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
index b0480c8fbcb..57ff20fecf5 100644
--- a/drivers/leds/leds-gpio.c
+++ b/drivers/leds/leds-gpio.c
@@ -11,15 +11,16 @@
*
*/
#include <linux/kernel.h>
-#include <linux/init.h>
#include <linux/platform_device.h>
+#include <linux/gpio.h>
#include <linux/leds.h>
+#include <linux/of.h>
#include <linux/of_platform.h>
#include <linux/of_gpio.h>
#include <linux/slab.h>
#include <linux/workqueue.h>
-
-#include <asm/gpio.h>
+#include <linux/module.h>
+#include <linux/err.h>
struct gpio_led_data {
struct led_classdev cdev;
@@ -90,7 +91,7 @@ static int gpio_blink_set(struct led_classdev *led_cdev,
delay_on, delay_off);
}
-static int __devinit create_gpio_led(const struct gpio_led *template,
+static int create_gpio_led(const struct gpio_led *template,
struct gpio_led_data *led_dat, struct device *parent,
int (*blink_set)(unsigned, int, unsigned long *, unsigned long *))
{
@@ -100,12 +101,12 @@ static int __devinit create_gpio_led(const struct gpio_led *template,
/* skip leds that aren't available */
if (!gpio_is_valid(template->gpio)) {
- printk(KERN_INFO "Skipping unavailable LED gpio %d (%s)\n",
+ dev_info(parent, "Skipping unavailable LED gpio %d (%s)\n",
template->gpio, template->name);
return 0;
}
- ret = gpio_request(template->gpio, template->name);
+ ret = devm_gpio_request(parent, template->gpio, template->name);
if (ret < 0)
return ret;
@@ -121,7 +122,7 @@ static int __devinit create_gpio_led(const struct gpio_led *template,
}
led_dat->cdev.brightness_set = gpio_led_set;
if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP)
- state = !!gpio_get_value(led_dat->gpio) ^ led_dat->active_low;
+ state = !!gpio_get_value_cansleep(led_dat->gpio) ^ led_dat->active_low;
else
state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
led_dat->cdev.brightness = state ? LED_FULL : LED_OFF;
@@ -130,18 +131,15 @@ static int __devinit create_gpio_led(const struct gpio_led *template,
ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state);
if (ret < 0)
- goto err;
-
+ return ret;
+
INIT_WORK(&led_dat->work, gpio_led_work);
ret = led_classdev_register(parent, &led_dat->cdev);
if (ret < 0)
- goto err;
+ return ret;
return 0;
-err:
- gpio_free(led_dat->gpio);
- return ret;
}
static void delete_gpio_led(struct gpio_led_data *led)
@@ -150,7 +148,6 @@ static void delete_gpio_led(struct gpio_led_data *led)
return;
led_classdev_unregister(&led->cdev);
cancel_work_sync(&led->work);
- gpio_free(led->gpio);
}
struct gpio_leds_priv {
@@ -165,24 +162,28 @@ static inline int sizeof_gpio_leds_priv(int num_leds)
}
/* Code to create from OpenFirmware platform devices */
-#ifdef CONFIG_LEDS_GPIO_OF
-static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_device *pdev)
+#ifdef CONFIG_OF_GPIO
+static struct gpio_leds_priv *gpio_leds_create_of(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node, *child;
struct gpio_leds_priv *priv;
- int count = 0, ret;
+ int count, ret;
/* count LEDs in this device, so we know how much to allocate */
- for_each_child_of_node(np, child)
- count++;
+ count = of_get_available_child_count(np);
if (!count)
- return NULL;
+ return ERR_PTR(-ENODEV);
- priv = kzalloc(sizeof_gpio_leds_priv(count), GFP_KERNEL);
+ for_each_available_child_of_node(np, child)
+ if (of_get_gpio(child, 0) == -EPROBE_DEFER)
+ return ERR_PTR(-EPROBE_DEFER);
+
+ priv = devm_kzalloc(&pdev->dev, sizeof_gpio_leds_priv(count),
+ GFP_KERNEL);
if (!priv)
- return NULL;
+ return ERR_PTR(-ENOMEM);
- for_each_child_of_node(np, child) {
+ for_each_available_child_of_node(np, child) {
struct gpio_led led = {};
enum of_gpio_flags flags;
const char *state;
@@ -202,6 +203,9 @@ static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_dev
led.default_state = LEDS_GPIO_DEFSTATE_OFF;
}
+ if (of_get_property(child, "retain-state-suspended", NULL))
+ led.retain_state_suspended = 1;
+
ret = create_gpio_led(&led, &priv->leds[priv->num_leds++],
&pdev->dev, NULL);
if (ret < 0) {
@@ -215,32 +219,34 @@ static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_dev
err:
for (count = priv->num_leds - 2; count >= 0; count--)
delete_gpio_led(&priv->leds[count]);
- kfree(priv);
- return NULL;
+ return ERR_PTR(-ENODEV);
}
static const struct of_device_id of_gpio_leds_match[] = {
{ .compatible = "gpio-leds", },
{},
};
-#else
-static struct gpio_leds_priv * __devinit gpio_leds_create_of(struct platform_device *pdev)
+
+MODULE_DEVICE_TABLE(of, of_gpio_leds_match);
+#else /* CONFIG_OF_GPIO */
+static struct gpio_leds_priv *gpio_leds_create_of(struct platform_device *pdev)
{
- return NULL;
+ return ERR_PTR(-ENODEV);
}
-#define of_gpio_leds_match NULL
-#endif
+#endif /* CONFIG_OF_GPIO */
-static int __devinit gpio_led_probe(struct platform_device *pdev)
+static int gpio_led_probe(struct platform_device *pdev)
{
- struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
+ struct gpio_led_platform_data *pdata = dev_get_platdata(&pdev->dev);
struct gpio_leds_priv *priv;
int i, ret = 0;
+
if (pdata && pdata->num_leds) {
- priv = kzalloc(sizeof_gpio_leds_priv(pdata->num_leds),
- GFP_KERNEL);
+ priv = devm_kzalloc(&pdev->dev,
+ sizeof_gpio_leds_priv(pdata->num_leds),
+ GFP_KERNEL);
if (!priv)
return -ENOMEM;
@@ -253,14 +259,13 @@ static int __devinit gpio_led_probe(struct platform_device *pdev)
/* On failure: unwind the led creations */
for (i = i - 1; i >= 0; i--)
delete_gpio_led(&priv->leds[i]);
- kfree(priv);
return ret;
}
}
} else {
priv = gpio_leds_create_of(pdev);
- if (!priv)
- return -ENODEV;
+ if (IS_ERR(priv))
+ return PTR_ERR(priv);
}
platform_set_drvdata(pdev, priv);
@@ -268,45 +273,30 @@ static int __devinit gpio_led_probe(struct platform_device *pdev)
return 0;
}
-static int __devexit gpio_led_remove(struct platform_device *pdev)
+static int gpio_led_remove(struct platform_device *pdev)
{
- struct gpio_leds_priv *priv = dev_get_drvdata(&pdev->dev);
+ struct gpio_leds_priv *priv = platform_get_drvdata(pdev);
int i;
for (i = 0; i < priv->num_leds; i++)
delete_gpio_led(&priv->leds[i]);
- dev_set_drvdata(&pdev->dev, NULL);
- kfree(priv);
-
return 0;
}
static struct platform_driver gpio_led_driver = {
.probe = gpio_led_probe,
- .remove = __devexit_p(gpio_led_remove),
+ .remove = gpio_led_remove,
.driver = {
.name = "leds-gpio",
.owner = THIS_MODULE,
- .of_match_table = of_gpio_leds_match,
+ .of_match_table = of_match_ptr(of_gpio_leds_match),
},
};
-MODULE_ALIAS("platform:leds-gpio");
-
-static int __init gpio_led_init(void)
-{
- return platform_driver_register(&gpio_led_driver);
-}
-
-static void __exit gpio_led_exit(void)
-{
- platform_driver_unregister(&gpio_led_driver);
-}
-
-module_init(gpio_led_init);
-module_exit(gpio_led_exit);
+module_platform_driver(gpio_led_driver);
MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>");
MODULE_DESCRIPTION("GPIO LED driver");
MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:leds-gpio");
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-13 10:54:51 +0000