-LED connected to GPIO
+LEDs connected to GPIO lines
Required properties:
-- compatible : should be "gpio-led".
-- label : (optional) the label for this LED. If omitted, the label is
+- compatible : should be "gpio-leds".
+
+Each LED is represented as a sub-node of the gpio-leds device. Each
+node's name represents the name of the corresponding LED.
+
+LED sub-node properties:
+- gpios : Should specify the LED's GPIO, see "Specifying GPIO information
+ for devices" in Documentation/powerpc/booting-without-of.txt. Active
+ low LEDs should be indicated using flags in the GPIO specifier.
+- label : (optional) The label for this LED. If omitted, the label is
taken from the node name (excluding the unit address).
-- gpios : should specify LED GPIO.
+- linux,default-trigger : (optional) This parameter, if present, is a
+ string defining the trigger assigned to the LED. Current triggers are:
+ "backlight" - LED will act as a back-light, controlled by the framebuffer
+ system
+ "default-on" - LED will turn on
+ "heartbeat" - LED "double" flashes at a load average based rate
+ "ide-disk" - LED indicates disk activity
+ "timer" - LED flashes at a fixed, configurable rate
-Example:
+Examples:
-led@0 {
- compatible = "gpio-led";
- label = "hdd";
- gpios = <&mcu_pio 0 1>;
+leds {
+ compatible = "gpio-leds";
+ hdd {
+ label = "IDE Activity";
+ gpios = <&mcu_pio 0 1>; /* Active low */
+ linux,default-trigger = "ide-disk";
+ };
};
+
+run-control {
+ compatible = "gpio-leds";
+ red {
+ gpios = <&mpc8572 6 0>;
+ };
+ green {
+ gpios = <&mpc8572 7 0>;
+ };
+}
*
* Copyright (C) 2007 8D Technologies inc.
* Raphael Assenat <raph@8d.com>
+ * Copyright (C) 2008 Freescale Semiconductor, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
return led_dat->platform_gpio_blink_set(led_dat->gpio, delay_on, delay_off);
}
+static int __devinit create_gpio_led(const struct gpio_led *template,
+ struct gpio_led_data *led_dat, struct device *parent,
+ int (*blink_set)(unsigned, unsigned long *, unsigned long *))
+{
+ int ret;
+
+ ret = gpio_request(template->gpio, template->name);
+ if (ret < 0)
+ return ret;
+
+ led_dat->cdev.name = template->name;
+ led_dat->cdev.default_trigger = template->default_trigger;
+ led_dat->gpio = template->gpio;
+ led_dat->can_sleep = gpio_cansleep(template->gpio);
+ led_dat->active_low = template->active_low;
+ if (blink_set) {
+ led_dat->platform_gpio_blink_set = blink_set;
+ led_dat->cdev.blink_set = gpio_blink_set;
+ }
+ led_dat->cdev.brightness_set = gpio_led_set;
+ led_dat->cdev.brightness = LED_OFF;
+ led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
+
+ ret = gpio_direction_output(led_dat->gpio, led_dat->active_low);
+ if (ret < 0)
+ goto err;
+
+ INIT_WORK(&led_dat->work, gpio_led_work);
+
+ ret = led_classdev_register(parent, &led_dat->cdev);
+ if (ret < 0)
+ goto err;
+
+ return 0;
+err:
+ gpio_free(led_dat->gpio);
+ return ret;
+}
+
+static void delete_gpio_led(struct gpio_led_data *led)
+{
+ led_classdev_unregister(&led->cdev);
+ cancel_work_sync(&led->work);
+ gpio_free(led->gpio);
+}
+
+#ifdef CONFIG_LEDS_GPIO_PLATFORM
static int gpio_led_probe(struct platform_device *pdev)
{
struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
- struct gpio_led *cur_led;
- struct gpio_led_data *leds_data, *led_dat;
+ struct gpio_led_data *leds_data;
int i, ret = 0;
if (!pdata)
return -ENOMEM;
for (i = 0; i < pdata->num_leds; i++) {
- cur_led = &pdata->leds[i];
- led_dat = &leds_data[i];
-
- ret = gpio_request(cur_led->gpio, cur_led->name);
+ ret = create_gpio_led(&pdata->leds[i], &leds_data[i],
+ &pdev->dev, pdata->gpio_blink_set);
if (ret < 0)
goto err;
-
- led_dat->cdev.name = cur_led->name;
- led_dat->cdev.default_trigger = cur_led->default_trigger;
- led_dat->gpio = cur_led->gpio;
- led_dat->can_sleep = gpio_cansleep(cur_led->gpio);
- led_dat->active_low = cur_led->active_low;
- if (pdata->gpio_blink_set) {
- led_dat->platform_gpio_blink_set = pdata->gpio_blink_set;
- led_dat->cdev.blink_set = gpio_blink_set;
- }
- led_dat->cdev.brightness_set = gpio_led_set;
- led_dat->cdev.brightness = LED_OFF;
- led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
-
- gpio_direction_output(led_dat->gpio, led_dat->active_low);
-
- INIT_WORK(&led_dat->work, gpio_led_work);
-
- ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
- if (ret < 0) {
- gpio_free(led_dat->gpio);
- goto err;
- }
}
platform_set_drvdata(pdev, leds_data);
return 0;
err:
- if (i > 0) {
- for (i = i - 1; i >= 0; i--) {
- led_classdev_unregister(&leds_data[i].cdev);
- cancel_work_sync(&leds_data[i].work);
- gpio_free(leds_data[i].gpio);
- }
- }
+ for (i = i - 1; i >= 0; i--)
+ delete_gpio_led(&leds_data[i]);
kfree(leds_data);
leds_data = platform_get_drvdata(pdev);
- for (i = 0; i < pdata->num_leds; i++) {
- led_classdev_unregister(&leds_data[i].cdev);
- cancel_work_sync(&leds_data[i].work);
- gpio_free(leds_data[i].gpio);
- }
+ for (i = 0; i < pdata->num_leds; i++)
+ delete_gpio_led(&leds_data[i]);
kfree(leds_data);
module_init(gpio_led_init);
module_exit(gpio_led_exit);
-MODULE_AUTHOR("Raphael Assenat <raph@8d.com>");
+MODULE_ALIAS("platform:leds-gpio");
+#endif /* CONFIG_LEDS_GPIO_PLATFORM */
+
+/* Code to create from OpenFirmware platform devices */
+#ifdef CONFIG_LEDS_GPIO_OF
+#include <linux/of_platform.h>
+#include <linux/of_gpio.h>
+
+struct gpio_led_of_platform_data {
+ int num_leds;
+ struct gpio_led_data led_data[];
+};
+
+static int __devinit of_gpio_leds_probe(struct of_device *ofdev,
+ const struct of_device_id *match)
+{
+ struct device_node *np = ofdev->node, *child;
+ struct gpio_led led;
+ struct gpio_led_of_platform_data *pdata;
+ int count = 0, ret;
+
+ /* count LEDs defined by this device, so we know how much to allocate */
+ for_each_child_of_node(np, child)
+ count++;
+ if (!count)
+ return 0; /* or ENODEV? */
+
+ pdata = kzalloc(sizeof(*pdata) + sizeof(struct gpio_led_data) * count,
+ GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ memset(&led, 0, sizeof(led));
+ for_each_child_of_node(np, child) {
+ enum of_gpio_flags flags;
+
+ led.gpio = of_get_gpio_flags(child, 0, &flags);
+ led.active_low = flags & OF_GPIO_ACTIVE_LOW;
+ led.name = of_get_property(child, "label", NULL) ? : child->name;
+ led.default_trigger =
+ of_get_property(child, "linux,default-trigger", NULL);
+
+ ret = create_gpio_led(&led, &pdata->led_data[pdata->num_leds++],
+ &ofdev->dev, NULL);
+ if (ret < 0) {
+ of_node_put(child);
+ goto err;
+ }
+ }
+
+ dev_set_drvdata(&ofdev->dev, pdata);
+
+ return 0;
+
+err:
+ for (count = pdata->num_leds - 2; count >= 0; count--)
+ delete_gpio_led(&pdata->led_data[count]);
+
+ kfree(pdata);
+
+ return ret;
+}
+
+static int __devexit of_gpio_leds_remove(struct of_device *ofdev)
+{
+ struct gpio_led_of_platform_data *pdata = dev_get_drvdata(&ofdev->dev);
+ int i;
+
+ for (i = 0; i < pdata->num_leds; i++)
+ delete_gpio_led(&pdata->led_data[i]);
+
+ kfree(pdata);
+
+ dev_set_drvdata(&ofdev->dev, NULL);
+
+ return 0;
+}
+
+static const struct of_device_id of_gpio_leds_match[] = {
+ { .compatible = "gpio-leds", },
+ {},
+};
+
+static struct of_platform_driver of_gpio_leds_driver = {
+ .driver = {
+ .name = "of_gpio_leds",
+ .owner = THIS_MODULE,
+ },
+ .match_table = of_gpio_leds_match,
+ .probe = of_gpio_leds_probe,
+ .remove = __devexit_p(of_gpio_leds_remove),
+};
+
+static int __init of_gpio_leds_init(void)
+{
+ return of_register_platform_driver(&of_gpio_leds_driver);
+}
+module_init(of_gpio_leds_init);
+
+static void __exit of_gpio_leds_exit(void)
+{
+ of_unregister_platform_driver(&of_gpio_leds_driver);
+}
+module_exit(of_gpio_leds_exit);
+#endif
+
+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");
projects / firefly-linux-kernel-4.4.55.git / commitdiff