111 lines
2.7 KiB
C
111 lines
2.7 KiB
C
/* drivers/leds/leds-s3c24xx.c
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*
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* (c) 2006 Simtec Electronics
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* http://armlinux.simtec.co.uk/
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* Ben Dooks <ben@simtec.co.uk>
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*
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* S3C24XX - LEDs GPIO driver
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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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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/leds.h>
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#include <linux/gpio.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/platform_data/leds-s3c24xx.h>
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#include <mach/regs-gpio.h>
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#include <plat/gpio-cfg.h>
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/* our context */
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struct s3c24xx_gpio_led {
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struct led_classdev cdev;
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struct s3c24xx_led_platdata *pdata;
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};
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static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev)
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{
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return container_of(led_cdev, struct s3c24xx_gpio_led, cdev);
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}
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static void s3c24xx_led_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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struct s3c24xx_gpio_led *led = to_gpio(led_cdev);
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struct s3c24xx_led_platdata *pd = led->pdata;
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int state = (value ? 1 : 0) ^ (pd->flags & S3C24XX_LEDF_ACTLOW);
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/* there will be a short delay between setting the output and
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* going from output to input when using tristate. */
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gpio_set_value(pd->gpio, state);
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if (pd->flags & S3C24XX_LEDF_TRISTATE) {
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if (value)
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gpio_direction_output(pd->gpio, state);
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else
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gpio_direction_input(pd->gpio);
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}
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}
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static int s3c24xx_led_probe(struct platform_device *dev)
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{
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struct s3c24xx_led_platdata *pdata = dev_get_platdata(&dev->dev);
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struct s3c24xx_gpio_led *led;
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int ret;
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led = devm_kzalloc(&dev->dev, sizeof(struct s3c24xx_gpio_led),
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GFP_KERNEL);
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if (!led)
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return -ENOMEM;
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led->cdev.brightness_set = s3c24xx_led_set;
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led->cdev.default_trigger = pdata->def_trigger;
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led->cdev.name = pdata->name;
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led->cdev.flags |= LED_CORE_SUSPENDRESUME;
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led->pdata = pdata;
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ret = devm_gpio_request(&dev->dev, pdata->gpio, "S3C24XX_LED");
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if (ret < 0)
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return ret;
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/* no point in having a pull-up if we are always driving */
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s3c_gpio_setpull(pdata->gpio, S3C_GPIO_PULL_NONE);
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if (pdata->flags & S3C24XX_LEDF_TRISTATE)
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gpio_direction_input(pdata->gpio);
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else
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gpio_direction_output(pdata->gpio,
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pdata->flags & S3C24XX_LEDF_ACTLOW ? 1 : 0);
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/* register our new led device */
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ret = devm_led_classdev_register(&dev->dev, &led->cdev);
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if (ret < 0)
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dev_err(&dev->dev, "led_classdev_register failed\n");
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return ret;
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}
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static struct platform_driver s3c24xx_led_driver = {
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.probe = s3c24xx_led_probe,
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.driver = {
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.name = "s3c24xx_led",
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},
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};
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module_platform_driver(s3c24xx_led_driver);
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MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
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MODULE_DESCRIPTION("S3C24XX LED driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:s3c24xx_led");
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