diff options
Diffstat (limited to 'drivers/leds/leds-s3c24xx.c')
| -rw-r--r-- | drivers/leds/leds-s3c24xx.c | 127 |
1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/leds/leds-s3c24xx.c b/drivers/leds/leds-s3c24xx.c new file mode 100644 index 000000000..83641a7b2 --- /dev/null +++ b/drivers/leds/leds-s3c24xx.c @@ -0,0 +1,127 @@ +/* drivers/leds/leds-s3c24xx.c + * + * (c) 2006 Simtec Electronics + * http://armlinux.simtec.co.uk/ + * Ben Dooks <ben@simtec.co.uk> + * + * S3C24XX - LEDs GPIO driver + * + * 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/platform_device.h> +#include <linux/leds.h> +#include <linux/gpio.h> +#include <linux/slab.h> +#include <linux/module.h> +#include <linux/platform_data/leds-s3c24xx.h> + +#include <mach/regs-gpio.h> +#include <plat/gpio-cfg.h> + +/* our context */ + +struct s3c24xx_gpio_led { + struct led_classdev cdev; + struct s3c24xx_led_platdata *pdata; +}; + +static inline struct s3c24xx_gpio_led *pdev_to_gpio(struct platform_device *dev) +{ + return platform_get_drvdata(dev); +} + +static inline struct s3c24xx_gpio_led *to_gpio(struct led_classdev *led_cdev) +{ + return container_of(led_cdev, struct s3c24xx_gpio_led, cdev); +} + +static void s3c24xx_led_set(struct led_classdev *led_cdev, + enum led_brightness value) +{ + struct s3c24xx_gpio_led *led = to_gpio(led_cdev); + struct s3c24xx_led_platdata *pd = led->pdata; + int state = (value ? 1 : 0) ^ (pd->flags & S3C24XX_LEDF_ACTLOW); + + /* there will be a short delay between setting the output and + * going from output to input when using tristate. */ + + gpio_set_value(pd->gpio, state); + + if (pd->flags & S3C24XX_LEDF_TRISTATE) { + if (value) + gpio_direction_output(pd->gpio, state); + else + gpio_direction_input(pd->gpio); + } +} + +static int s3c24xx_led_remove(struct platform_device *dev) +{ + struct s3c24xx_gpio_led *led = pdev_to_gpio(dev); + + led_classdev_unregister(&led->cdev); + + return 0; +} + +static int s3c24xx_led_probe(struct platform_device *dev) +{ + struct s3c24xx_led_platdata *pdata = dev_get_platdata(&dev->dev); + struct s3c24xx_gpio_led *led; + int ret; + + led = devm_kzalloc(&dev->dev, sizeof(struct s3c24xx_gpio_led), + GFP_KERNEL); + if (!led) + return -ENOMEM; + + platform_set_drvdata(dev, led); + + led->cdev.brightness_set = s3c24xx_led_set; + led->cdev.default_trigger = pdata->def_trigger; + led->cdev.name = pdata->name; + led->cdev.flags |= LED_CORE_SUSPENDRESUME; + + led->pdata = pdata; + + ret = devm_gpio_request(&dev->dev, pdata->gpio, "S3C24XX_LED"); + if (ret < 0) + return ret; + + /* no point in having a pull-up if we are always driving */ + + s3c_gpio_setpull(pdata->gpio, S3C_GPIO_PULL_NONE); + + if (pdata->flags & S3C24XX_LEDF_TRISTATE) + gpio_direction_input(pdata->gpio); + else + gpio_direction_output(pdata->gpio, + pdata->flags & S3C24XX_LEDF_ACTLOW ? 1 : 0); + + /* register our new led device */ + + ret = led_classdev_register(&dev->dev, &led->cdev); + if (ret < 0) + dev_err(&dev->dev, "led_classdev_register failed\n"); + + return ret; +} + +static struct platform_driver s3c24xx_led_driver = { + .probe = s3c24xx_led_probe, + .remove = s3c24xx_led_remove, + .driver = { + .name = "s3c24xx_led", + }, +}; + +module_platform_driver(s3c24xx_led_driver); + +MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>"); +MODULE_DESCRIPTION("S3C24XX LED driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:s3c24xx_led"); |