*
* 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
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
+#include <linux/slab.h>
#include <linux/workqueue.h>
#include <asm/gpio.h>
u8 new_level;
u8 can_sleep;
u8 active_low;
+ u8 blinking;
+ int (*platform_gpio_blink_set)(unsigned gpio, int state,
+ unsigned long *delay_on, unsigned long *delay_off);
};
static void gpio_led_work(struct work_struct *work)
struct gpio_led_data *led_dat =
container_of(work, struct gpio_led_data, work);
- gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level);
+ if (led_dat->blinking) {
+ led_dat->platform_gpio_blink_set(led_dat->gpio,
+ led_dat->new_level,
+ NULL, NULL);
+ led_dat->blinking = 0;
+ } else
+ gpio_set_value_cansleep(led_dat->gpio, led_dat->new_level);
}
static void gpio_led_set(struct led_classdev *led_cdev,
if (led_dat->active_low)
level = !level;
- /* setting GPIOs with I2C/etc requires a preemptible task context */
+ /* Setting GPIOs with I2C/etc requires a task context, and we don't
+ * seem to have a reliable way to know if we're already in one; so
+ * let's just assume the worst.
+ */
if (led_dat->can_sleep) {
- if (preempt_count()) {
- led_dat->new_level = level;
- schedule_work(&led_dat->work);
+ led_dat->new_level = level;
+ schedule_work(&led_dat->work);
+ } else {
+ if (led_dat->blinking) {
+ led_dat->platform_gpio_blink_set(led_dat->gpio, level,
+ NULL, NULL);
+ led_dat->blinking = 0;
} else
- gpio_set_value_cansleep(led_dat->gpio, level);
- } else
- gpio_set_value(led_dat->gpio, level);
+ gpio_set_value(led_dat->gpio, level);
+ }
+}
+
+static int gpio_blink_set(struct led_classdev *led_cdev,
+ unsigned long *delay_on, unsigned long *delay_off)
+{
+ struct gpio_led_data *led_dat =
+ container_of(led_cdev, struct gpio_led_data, cdev);
+
+ led_dat->blinking = 1;
+ return led_dat->platform_gpio_blink_set(led_dat->gpio, GPIO_LED_BLINK,
+ 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, int, unsigned long *, unsigned long *))
+{
+ int ret, state;
+
+ led_dat->gpio = -1;
+
+ /* skip leds that aren't available */
+ if (!gpio_is_valid(template->gpio)) {
+ printk(KERN_INFO "Skipping unavailable LED gpio %d (%s)\n",
+ template->gpio, template->name);
+ return 0;
+ }
+
+ 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;
+ led_dat->blinking = 0;
+ 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;
+ if (template->default_state == LEDS_GPIO_DEFSTATE_KEEP)
+ state = !!gpio_get_value(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;
+ if (!template->retain_state_suspended)
+ led_dat->cdev.flags |= LED_CORE_SUSPENDRESUME;
+
+ ret = gpio_direction_output(led_dat->gpio, led_dat->active_low ^ state);
+ 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)
+{
+ if (!gpio_is_valid(led->gpio))
+ return;
+ led_classdev_unregister(&led->cdev);
+ cancel_work_sync(&led->work);
+ gpio_free(led->gpio);
}
-static int __init gpio_led_probe(struct platform_device *pdev)
+#ifdef CONFIG_LEDS_GPIO_PLATFORM
+static int __devinit 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];
-
- 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;
- led_dat->cdev.brightness_set = gpio_led_set;
- led_dat->cdev.brightness = cur_led->active_low ? LED_FULL : LED_OFF;
-
- ret = gpio_request(led_dat->gpio, led_dat->cdev.name);
+ ret = create_gpio_led(&pdata->leds[i], &leds_data[i],
+ &pdev->dev, pdata->gpio_blink_set);
if (ret < 0)
goto err;
-
- gpio_direction_output(led_dat->gpio, led_dat->active_low);
-
- ret = led_classdev_register(&pdev->dev, &led_dat->cdev);
- if (ret < 0) {
- gpio_free(led_dat->gpio);
- goto err;
- }
-
- INIT_WORK(&led_dat->work, gpio_led_work);
}
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);
- gpio_free(leds_data[i].gpio);
- }
- }
+ for (i = i - 1; i >= 0; i--)
+ delete_gpio_led(&leds_data[i]);
- flush_scheduled_work();
kfree(leds_data);
return ret;
}
-static int __exit gpio_led_remove(struct platform_device *pdev)
+static int __devexit gpio_led_remove(struct platform_device *pdev)
{
int i;
struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
leds_data = platform_get_drvdata(pdev);
- for (i = 0; i < pdata->num_leds; i++) {
- led_classdev_unregister(&leds_data[i].cdev);
- gpio_free(leds_data[i].gpio);
- }
-
+ for (i = 0; i < pdata->num_leds; i++)
+ delete_gpio_led(&leds_data[i]);
+
kfree(leds_data);
return 0;
}
-#ifdef CONFIG_PM
-static int gpio_led_suspend(struct platform_device *pdev, pm_message_t state)
+static struct platform_driver gpio_led_driver = {
+ .probe = gpio_led_probe,
+ .remove = __devexit_p(gpio_led_remove),
+ .driver = {
+ .name = "leds-gpio",
+ .owner = THIS_MODULE,
+ },
+};
+
+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 gpio_led_platform_data *pdata = pdev->dev.platform_data;
- struct gpio_led_data *leds_data;
- int i;
-
- leds_data = platform_get_drvdata(pdev);
+ struct device_node *np = ofdev->dev.of_node, *child;
+ 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;
- for (i = 0; i < pdata->num_leds; i++)
- led_classdev_suspend(&leds_data[i].cdev);
+ for_each_child_of_node(np, child) {
+ struct gpio_led led = {};
+ enum of_gpio_flags flags;
+ const char *state;
+
+ 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);
+ state = of_get_property(child, "default-state", NULL);
+ if (state) {
+ if (!strcmp(state, "keep"))
+ led.default_state = LEDS_GPIO_DEFSTATE_KEEP;
+ else if(!strcmp(state, "on"))
+ led.default_state = LEDS_GPIO_DEFSTATE_ON;
+ else
+ led.default_state = LEDS_GPIO_DEFSTATE_OFF;
+ }
+
+ 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 gpio_led_resume(struct platform_device *pdev)
+static int __devexit of_gpio_leds_remove(struct of_device *ofdev)
{
- struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
- struct gpio_led_data *leds_data;
+ struct gpio_led_of_platform_data *pdata = dev_get_drvdata(&ofdev->dev);
int i;
- leds_data = platform_get_drvdata(pdev);
-
for (i = 0; i < pdata->num_leds; i++)
- led_classdev_resume(&leds_data[i].cdev);
+ delete_gpio_led(&pdata->led_data[i]);
+
+ kfree(pdata);
+
+ dev_set_drvdata(&ofdev->dev, NULL);
return 0;
}
-#else
-#define gpio_led_suspend NULL
-#define gpio_led_resume NULL
-#endif
-static struct platform_driver gpio_led_driver = {
- .remove = __exit_p(gpio_led_remove),
- .suspend = gpio_led_suspend,
- .resume = gpio_led_resume,
- .driver = {
- .name = "leds-gpio",
- .owner = THIS_MODULE,
+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,
+ .of_match_table = of_gpio_leds_match,
},
+ .probe = of_gpio_leds_probe,
+ .remove = __devexit_p(of_gpio_leds_remove),
};
+#endif
static int __init gpio_led_init(void)
{
- return platform_driver_probe(&gpio_led_driver, gpio_led_probe);
+ int ret;
+
+#ifdef CONFIG_LEDS_GPIO_PLATFORM
+ ret = platform_driver_register(&gpio_led_driver);
+ if (ret)
+ return ret;
+#endif
+#ifdef CONFIG_LEDS_GPIO_OF
+ ret = of_register_platform_driver(&of_gpio_leds_driver);
+#endif
+#ifdef CONFIG_LEDS_GPIO_PLATFORM
+ if (ret)
+ platform_driver_unregister(&gpio_led_driver);
+#endif
+
+ return ret;
}
static void __exit gpio_led_exit(void)
{
+#ifdef CONFIG_LEDS_GPIO_PLATFORM
platform_driver_unregister(&gpio_led_driver);
+#endif
+#ifdef CONFIG_LEDS_GPIO_OF
+ of_unregister_platform_driver(&of_gpio_leds_driver);
+#endif
}
module_init(gpio_led_init);
module_exit(gpio_led_exit);
-MODULE_AUTHOR("Raphael Assenat <raph@8d.com>");
+MODULE_AUTHOR("Raphael Assenat <raph@8d.com>, Trent Piepho <tpiepho@freescale.com>");
MODULE_DESCRIPTION("GPIO LED driver");
MODULE_LICENSE("GPL");
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff