1 files changed, 199 insertions, 0 deletions

diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
new file mode 100644
index 000000000000..47d90db280ce
--- /dev/null
+++ b/drivers/leds/leds-gpio.c
@@ -0,0 +1,199 @@
+/*
+ * LEDs driver for GPIOs
+ *
+ * Copyright (C) 2007 8D Technologies inc.
+ * Raphael Assenat <raph@8d.com>
+ *
+ * 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
+ * published by the Free Software Foundation.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+#include <linux/workqueue.h>
+
+#include <asm/gpio.h>
+
+struct gpio_led_data {
+        struct led_classdev cdev;
+        unsigned gpio;
+        struct work_struct work;
+        u8 new_level;
+        u8 can_sleep;
+        u8 active_low;
+};
+
+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);
+}
+
+static void gpio_led_set(struct led_classdev *led_cdev,
+        enum led_brightness value)
+{
+        struct gpio_led_data *led_dat =
+                container_of(led_cdev, struct gpio_led_data, cdev);
+        int level;
+
+        if (value == LED_OFF)
+                level = 0;
+        else
+                level = 1;
+
+        if (led_dat->active_low)
+                level = !level;
+
+        /* setting GPIOs with I2C/etc requires a preemptible task context */
+        if (led_dat->can_sleep) {
+                if (preempt_count()) {
+                        led_dat->new_level = level;
+                        schedule_work(&led_dat->work);
+                } else
+                        gpio_set_value_cansleep(led_dat->gpio, level);
+        } else
+                gpio_set_value(led_dat->gpio, level);
+}
+
+static int __init 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;
+        int i, ret = 0;
+
+        if (!pdata)
+                return -EBUSY;
+
+        leds_data = kzalloc(sizeof(struct gpio_led_data) * pdata->num_leds,
+                                GFP_KERNEL);
+        if (!leds_data)
+                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);
+                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);
+                }
+        }
+
+        flush_scheduled_work();
+        kfree(leds_data);
+
+        return ret;
+}
+
+static int __exit gpio_led_remove(struct platform_device *pdev)
+{
+        int i;
+        struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
+        struct gpio_led_data *leds_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);
+        }
+        
+        kfree(leds_data);
+
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int gpio_led_suspend(struct platform_device *pdev, pm_message_t state)
+{
+        struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
+        struct gpio_led_data *leds_data;
+        int i;
+        
+        leds_data = platform_get_drvdata(pdev);
+
+        for (i = 0; i < pdata->num_leds; i++)
+                led_classdev_suspend(&leds_data[i].cdev);
+
+        return 0;
+}
+
+static int gpio_led_resume(struct platform_device *pdev)
+{
+        struct gpio_led_platform_data *pdata = pdev->dev.platform_data;
+        struct gpio_led_data *leds_data;
+        int i;
+
+        leds_data = platform_get_drvdata(pdev);
+
+        for (i = 0; i < pdata->num_leds; i++)
+                led_classdev_resume(&leds_data[i].cdev);
+
+        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 int __init gpio_led_init(void)
+{
+        return platform_driver_probe(&gpio_led_driver, gpio_led_probe);
+}
+
+static void __exit gpio_led_exit(void)
+{
+        platform_driver_unregister(&gpio_led_driver);
+}
+
+module_init(gpio_led_init);
+module_exit(gpio_led_exit);
+
+MODULE_AUTHOR("Raphael Assenat <raph@8d.com>");
+MODULE_DESCRIPTION("GPIO LED driver");
+MODULE_LICENSE("GPL");