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145 lines
3.3 KiB
C
145 lines
3.3 KiB
C
/*
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* LED driver for the RouterBOARD 750
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*
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* Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/leds.h>
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#include <linux/slab.h>
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#include <asm/mach-ath79/mach-rb750.h>
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#define DRV_NAME "leds-rb750"
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struct rb750_led_dev {
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struct led_classdev cdev;
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u32 mask;
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int active_low;
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void (*latch_change)(u32 clear, u32 set);
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};
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struct rb750_led_drvdata {
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struct rb750_led_dev *led_devs;
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int num_leds;
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};
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static inline struct rb750_led_dev *to_rbled(struct led_classdev *led_cdev)
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{
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return (struct rb750_led_dev *)container_of(led_cdev,
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struct rb750_led_dev, cdev);
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}
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static void rb750_led_brightness_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct rb750_led_dev *rbled = to_rbled(led_cdev);
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int level;
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level = (value == LED_OFF) ? 0 : 1;
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level ^= rbled->active_low;
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if (level)
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rbled->latch_change(0, rbled->mask);
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else
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rbled->latch_change(rbled->mask, 0);
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}
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static int rb750_led_probe(struct platform_device *pdev)
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{
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struct rb750_led_platform_data *pdata;
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struct rb750_led_drvdata *drvdata;
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int ret = 0;
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int i;
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pdata = pdev->dev.platform_data;
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if (!pdata)
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return -EINVAL;
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drvdata = kzalloc(sizeof(struct rb750_led_drvdata) +
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sizeof(struct rb750_led_dev) * pdata->num_leds,
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GFP_KERNEL);
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if (!drvdata)
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return -ENOMEM;
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drvdata->num_leds = pdata->num_leds;
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drvdata->led_devs = (struct rb750_led_dev *) &drvdata[1];
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for (i = 0; i < drvdata->num_leds; i++) {
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struct rb750_led_dev *rbled = &drvdata->led_devs[i];
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struct rb750_led_data *led_data = &pdata->leds[i];
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rbled->cdev.name = led_data->name;
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rbled->cdev.default_trigger = led_data->default_trigger;
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rbled->cdev.brightness_set = rb750_led_brightness_set;
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rbled->cdev.brightness = LED_OFF;
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rbled->mask = led_data->mask;
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rbled->active_low = !!led_data->active_low;
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rbled->latch_change = pdata->latch_change;
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ret = led_classdev_register(&pdev->dev, &rbled->cdev);
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if (ret)
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goto err;
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}
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platform_set_drvdata(pdev, drvdata);
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return 0;
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err:
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for (i = i - 1; i >= 0; i--)
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led_classdev_unregister(&drvdata->led_devs[i].cdev);
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kfree(drvdata);
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return ret;
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}
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static int rb750_led_remove(struct platform_device *pdev)
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{
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struct rb750_led_drvdata *drvdata;
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int i;
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drvdata = platform_get_drvdata(pdev);
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for (i = 0; i < drvdata->num_leds; i++)
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led_classdev_unregister(&drvdata->led_devs[i].cdev);
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kfree(drvdata);
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return 0;
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}
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static struct platform_driver rb750_led_driver = {
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.probe = rb750_led_probe,
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.remove = rb750_led_remove,
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.driver = {
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.name = DRV_NAME,
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.owner = THIS_MODULE,
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},
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};
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MODULE_ALIAS("platform:leds-rb750");
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static int __init rb750_led_init(void)
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{
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return platform_driver_register(&rb750_led_driver);
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}
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static void __exit rb750_led_exit(void)
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{
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platform_driver_unregister(&rb750_led_driver);
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}
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module_init(rb750_led_init);
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module_exit(rb750_led_exit);
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MODULE_DESCRIPTION(DRV_NAME);
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MODULE_DESCRIPTION("LED driver for the RouterBOARD 750");
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MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
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MODULE_LICENSE("GPL v2");
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