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127 lines
3.1 KiB
127 lines
3.1 KiB
/* 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 *pdev_to_gpio(struct platform_device *dev) |
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{ |
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return platform_get_drvdata(dev); |
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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_remove(struct platform_device *dev) |
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{ |
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struct s3c24xx_gpio_led *led = pdev_to_gpio(dev); |
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led_classdev_unregister(&led->cdev); |
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return 0; |
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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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platform_set_drvdata(dev, led); |
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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 = 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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.remove = s3c24xx_led_remove, |
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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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