ar71xx: add LED driver for the RB750

[openwrt.git] / target / linux / ar71xx / files / drivers / leds / leds-rb750.c

diff --git a/target/linux/ar71xx/files/drivers/leds/leds-rb750.c b/target/linux/ar71xx/files/drivers/leds/leds-rb750.c
new file mode 100644 (file)
index 0000000..2e60647
--- /dev/null
+++ b/target/linux/ar71xx/files/drivers/leds/leds-rb750.c
@@ -0,0 +1,140 @@
+/*
+ * LED driver for the RouterBOARD 750
+ *
+ * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * 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 <asm/mach-ar71xx/mach-rb750.h>
+
+#define DRV_NAME       "leds-rb750"
+
+struct rb750_led_dev {
+       struct led_classdev     cdev;
+       u32                     mask;
+       int                     active_low;
+};
+
+struct rb750_led_drvdata {
+       struct rb750_led_dev    *led_devs;
+       int                     num_leds;
+};
+
+static inline struct rb750_led_dev *to_rbled(struct led_classdev *led_cdev)
+{
+       return (struct rb750_led_dev *)container_of(led_cdev,
+               struct rb750_led_dev, cdev);
+}
+
+static void rb750_led_brightness_set(struct led_classdev *led_cdev,
+                                    enum led_brightness value)
+{
+       struct rb750_led_dev *rbled = to_rbled(led_cdev);
+       int level;
+
+       level = (value == LED_OFF) ? 0 : 1;
+       level ^= rbled->active_low;
+
+       if (level)
+               rb750_latch_change(0, rbled->mask);
+       else
+               rb750_latch_change(rbled->mask, 0);
+}
+
+static int __devinit rb750_led_probe(struct platform_device *pdev)
+{
+       struct rb750_led_platform_data *pdata;
+       struct rb750_led_drvdata *drvdata;
+       int ret = 0;
+       int i;
+
+       pdata = pdev->dev.platform_data;
+       if (!pdata)
+               return -EINVAL;
+
+       drvdata = kzalloc(sizeof(struct rb750_led_drvdata) +
+                         sizeof(struct rb750_led_dev) * pdata->num_leds,
+                         GFP_KERNEL);
+       if (!drvdata)
+               return -ENOMEM;
+
+       drvdata->num_leds = pdata->num_leds;
+       drvdata->led_devs = (struct rb750_led_dev *) &drvdata[1];
+
+       for (i = 0; i < drvdata->num_leds; i++) {
+               struct rb750_led_dev *rbled = &drvdata->led_devs[i];
+               struct rb750_led_data *led_data = &pdata->leds[i];
+
+               rbled->cdev.name = led_data->name;
+               rbled->cdev.default_trigger = led_data->default_trigger;
+               rbled->cdev.brightness_set = rb750_led_brightness_set;
+               rbled->cdev.brightness = LED_OFF;
+
+               rbled->mask = led_data->mask;
+               rbled->active_low = !!led_data->active_low;
+
+               ret = led_classdev_register(&pdev->dev, &rbled->cdev);
+               if (ret)
+                       goto err;
+       }
+
+       platform_set_drvdata(pdev, drvdata);
+       return 0;
+
+ err:
+       for (i = i - 1; i >= 0; i--)
+               led_classdev_unregister(&drvdata->led_devs[i].cdev);
+
+       kfree(drvdata);
+       return ret;
+}
+
+static int __devexit rb750_led_remove(struct platform_device *pdev)
+{
+       struct rb750_led_drvdata *drvdata;
+       int i;
+
+       drvdata = platform_get_drvdata(pdev);
+       for (i = 0; i < drvdata->num_leds; i++)
+               led_classdev_unregister(&drvdata->led_devs[i].cdev);
+
+       kfree(drvdata);
+       return 0;
+}
+
+static struct platform_driver rb750_led_driver = {
+       .probe          = rb750_led_probe,
+       .remove         = __devexit_p(rb750_led_remove),
+       .driver         = {
+               .name   = DRV_NAME,
+               .owner  = THIS_MODULE,
+       },
+};
+
+MODULE_ALIAS("platform:leds-rb750");
+
+static int __init rb750_led_init(void)
+{
+       return platform_driver_register(&rb750_led_driver);
+}
+
+static void __exit rb750_led_exit(void)
+{
+       platform_driver_unregister(&rb750_led_driver);
+}
+
+module_init(rb750_led_init);
+module_exit(rb750_led_exit);
+
+MODULE_DESCRIPTION(DRV_NAME);
+MODULE_DESCRIPTION("LED driver for the RouterBOARD 750");
+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
+MODULE_LICENSE("GPL v2");