[PATCH] LED: add LED device support for locomo devices

Adds an LED driver for LEDs exported by the Sharp LOCOMO chip as found on some
models of Sharp Zaurus.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 103 insertions, 0 deletions

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index f7846b40c84..6099e32985a 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -29,6 +29,13 @@ config LEDS_CORGI
           This option enables support for the LEDs on Sharp Zaurus
           SL-C7x0 series (C700, C750, C760, C860).
 
+config LEDS_LOCOMO
+        tristate "LED Support for Locomo device"
+        depends LEDS_CLASS && SHARP_LOCOMO
+        help
+          This option enables support for the LEDs on Sharp Locomo.
+          Zaurus models SL-5500 and SL-5600.
+
 config LEDS_SPITZ
         tristate "LED Support for the Sharp SL-Cxx00 series"
         depends LEDS_CLASS && PXA_SHARP_Cxx00
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index cb5d0ada6a8..d60e12b8af2 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_LEDS_TRIGGERS)		+= led-triggers.o
 
 # LED Platform Drivers
 obj-$(CONFIG_LEDS_CORGI)                += leds-corgi.o
+obj-$(CONFIG_LEDS_LOCOMO)               += leds-locomo.o
 obj-$(CONFIG_LEDS_SPITZ)                += leds-spitz.o
 
 # LED Triggers
diff --git a/drivers/leds/leds-locomo.c b/drivers/leds/leds-locomo.c
new file mode 100644
index 00000000000..749a86c2adb
--- /dev/null
+++ b/drivers/leds/leds-locomo.c
@@ -0,0 +1,95 @@
+/*
+ * linux/drivers/leds/locomo.c
+ *
+ * Copyright (C) 2005 John Lenz <lenz@cs.wisc.edu>
+ *
+ * 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/device.h>
+#include <linux/leds.h>
+
+#include <asm/hardware.h>
+#include <asm/hardware/locomo.h>
+
+static void locomoled_brightness_set(struct led_classdev *led_cdev,
+                                enum led_brightness value, int offset)
+{
+        struct locomo_dev *locomo_dev = LOCOMO_DEV(led_cdev->class_dev->dev);
+        unsigned long flags;
+
+        local_irq_save(flags);
+        if (value)
+                locomo_writel(LOCOMO_LPT_TOFH, locomo_dev->mapbase + offset);
+        else
+                locomo_writel(LOCOMO_LPT_TOFL, locomo_dev->mapbase + offset);
+        local_irq_restore(flags);
+}
+
+static void locomoled_brightness_set0(struct led_classdev *led_cdev,
+                                enum led_brightness value)
+{
+        locomoled_brightness_set(led_cdev, value, LOCOMO_LPT0);
+}
+
+static void locomoled_brightness_set1(struct led_classdev *led_cdev,
+                                enum led_brightness value)
+{
+        locomoled_brightness_set(led_cdev, value, LOCOMO_LPT1);
+}
+
+static struct led_classdev locomo_led0 = {
+        .name                   = "locomo:amber",
+        .brightness_set         = locomoled_brightness_set0,
+};
+
+static struct led_classdev locomo_led1 = {
+        .name                   = "locomo:green",
+        .brightness_set         = locomoled_brightness_set1,
+};
+
+static int locomoled_probe(struct locomo_dev *ldev)
+{
+        int ret;
+
+        ret = led_classdev_register(&ldev->dev, &locomo_led0);
+        if (ret < 0)
+                return ret;
+
+        ret = led_classdev_register(&ldev->dev, &locomo_led1);
+        if (ret < 0)
+                led_classdev_unregister(&locomo_led0);
+
+        return ret;
+}
+
+static int locomoled_remove(struct locomo_dev *dev)
+{
+        led_classdev_unregister(&locomo_led0);
+        led_classdev_unregister(&locomo_led1);
+        return 0;
+}
+
+static struct locomo_driver locomoled_driver = {
+        .drv = {
+                .name = "locomoled"
+        },
+        .devid  = LOCOMO_DEVID_LED,
+        .probe  = locomoled_probe,
+        .remove = locomoled_remove,
+};
+
+static int __init locomoled_init(void)
+{
+        return locomo_driver_register(&locomoled_driver);
+}
+module_init(locomoled_init);
+
+MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
+MODULE_DESCRIPTION("Locomo LED driver");
+MODULE_LICENSE("GPL");