[PATCH] S3C24XX GPIO LED support

GPIO LED support for Samsung S3C24XX SoC series processors.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Acked-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 199 insertions, 0 deletions

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 2c4f20b7f021..88565becb877 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -59,6 +59,13 @@ config LEDS_TOSA
           This option enables support for the LEDs on Sharp Zaurus
           SL-6000 series.
 
+config LEDS_S3C24XX
+        tristate "LED Support for Samsung S3C24XX GPIO LEDs"
+        depends on LEDS_CLASS && ARCH_S3C2410
+        help
+          This option enables support for LEDs connected to GPIO lines
+          on Samsung S3C24XX series CPUs, such as the S3C2410 and S3C2440.
+
 config LEDS_TRIGGER_TIMER
         tristate "LED Timer Trigger"
         depends LEDS_TRIGGERS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 40699d3cabbf..40f042633bf5 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_LEDS_LOCOMO)		+= leds-locomo.o
 obj-$(CONFIG_LEDS_SPITZ)                += leds-spitz.o
 obj-$(CONFIG_LEDS_IXP4XX)               += leds-ixp4xx-gpio.o
 obj-$(CONFIG_LEDS_TOSA)                 += leds-tosa.o
+obj-$(CONFIG_LEDS_S3C24XX)              += leds-s3c24xx.o
 
 # LED Triggers
 obj-$(CONFIG_LEDS_TRIGGER_TIMER)        += ledtrig-timer.o
diff --git a/drivers/leds/leds-s3c24xx.c b/drivers/leds/leds-s3c24xx.c
new file mode 100644
index 000000000000..650cf72dc675
--- /dev/null
+++ b/drivers/leds/leds-s3c24xx.c
@@ -0,0 +1,163 @@
+/* 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/config.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/leds.h>
+
+#include <asm/arch/hardware.h>
+#include <asm/arch/regs-gpio.h>
+#include <asm/arch/leds-gpio.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;
+
+        /* there will be a sort delay between setting the output and
+         * going from output to input when using tristate. */
+
+        s3c2410_gpio_setpin(pd->gpio, (value ? 1 : 0) ^
+                            (pd->flags & S3C24XX_LEDF_ACTLOW));
+
+        if (pd->flags & S3C24XX_LEDF_TRISTATE)
+                s3c2410_gpio_cfgpin(pd->gpio,
+                                    value ? S3C2410_GPIO_OUTPUT : S3C2410_GPIO_INPUT);
+
+}
+
+static int s3c24xx_led_remove(struct platform_device *dev)
+{
+        struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);
+
+        led_classdev_unregister(&led->cdev);
+        kfree(led);
+
+        return 0;
+}
+
+static int s3c24xx_led_probe(struct platform_device *dev)
+{
+        struct s3c24xx_led_platdata *pdata = dev->dev.platform_data;
+        struct s3c24xx_gpio_led *led;
+        int ret;
+
+        led = kzalloc(sizeof(struct s3c24xx_gpio_led), GFP_KERNEL);
+        if (led == NULL) {
+                dev_err(&dev->dev, "No memory for device\n");
+                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->pdata = pdata;
+
+        /* no point in having a pull-up if we are always driving */
+
+        if (pdata->flags & S3C24XX_LEDF_TRISTATE) {
+                s3c2410_gpio_setpin(pdata->gpio, 0);
+                s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_INPUT);
+        } else {
+                s3c2410_gpio_pullup(pdata->gpio, 0);
+                s3c2410_gpio_setpin(pdata->gpio, 0);
+                s3c2410_gpio_cfgpin(pdata->gpio, S3C2410_GPIO_OUTPUT);
+        }
+
+        /* 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");
+                goto exit_err1;
+        }
+
+        return 0;
+
+ exit_err1:
+        kfree(led);
+        return ret;
+}
+
+
+#ifdef CONFIG_PM
+static int s3c24xx_led_suspend(struct platform_device *dev, pm_message_t state)
+{
+        struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);
+
+        led_classdev_suspend(&led->cdev);
+        return 0;
+}
+
+static int s3c24xx_led_resume(struct platform_device *dev)
+{
+        struct s3c24xx_gpio_led *led = pdev_to_gpio(dev);
+
+        led_classdev_resume(&led->cdev);
+        return 0;
+}
+#else
+#define s3c24xx_led_suspend NULL
+#define s3c24xx_led_resume NULL
+#endif
+
+static struct platform_driver s3c24xx_led_driver = {
+        .probe          = s3c24xx_led_probe,
+        .remove         = s3c24xx_led_remove,
+        .suspend        = s3c24xx_led_suspend,
+        .resume         = s3c24xx_led_resume,
+        .driver         = {
+                .name           = "s3c24xx_led",
+                .owner          = THIS_MODULE,
+        },
+};
+
+static int __init s3c24xx_led_init(void)
+{
+        return platform_driver_register(&s3c24xx_led_driver);
+}
+
+static void __exit s3c24xx_led_exit(void)
+{
+        platform_driver_unregister(&s3c24xx_led_driver);
+}
+
+module_init(s3c24xx_led_init);
+module_exit(s3c24xx_led_exit);
+
+MODULE_AUTHOR("Ben Dooks <ben@simtec.co.uk>");
+MODULE_DESCRIPTION("S3C24XX LED driver");
+MODULE_LICENSE("GPL");
diff --git a/include/asm-arm/arch-s3c2410/leds-gpio.h b/include/asm-arm/arch-s3c2410/leds-gpio.h
new file mode 100644
index 000000000000..f07ed040622b
--- /dev/null
+++ b/include/asm-arm/arch-s3c2410/leds-gpio.h
@@ -0,0 +1,28 @@
+/* linux/include/asm-arm/arch-s3c2410/leds-gpio.h
+ *
+ * (c) 2006 Simtec Electronics
+ *      http://armlinux.simtec.co.uk/
+ *      Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C24XX - LEDs GPIO connector
+ *
+ * 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.
+*/
+
+#ifndef __ASM_ARCH_LEDSGPIO_H
+#define __ASM_ARCH_LEDSGPIO_H "leds-gpio.h"
+
+#define S3C24XX_LEDF_ACTLOW     (1<<0)          /* LED is on when GPIO low */
+#define S3C24XX_LEDF_TRISTATE   (1<<1)          /* tristate to turn off */
+
+struct s3c24xx_led_platdata {
+        unsigned int             gpio;
+        unsigned int             flags;
+
+        char                    *name;
+        char                    *def_trigger;
+};
+
+#endif /* __ASM_ARCH_LEDSGPIO_H */