leds: Add IPAQ h1940 LEDs support

This patch adds the support for the IPAQ h1940 leds.

In order to create the amber led (used for the battery charging), the red and
green leds are set to the same default trigger. Due to hardware limitations,
the blue led can only be set in blinking mode.

Signed-off-by: Arnaud Patard <arnaud.patard@rtp-net.org>
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>

3 files changed, 170 insertions, 0 deletions

diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 7399ba791116..383d297f328a 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -82,6 +82,12 @@ config LEDS_WRAP
         help
           This option enables support for the PCEngines WRAP programmable LEDs.
 
+config LEDS_H1940
+        tristate "LED Support for iPAQ H1940 device"
+        depends LEDS_CLASS && ARCH_H1940
+        help
+          This option enables support for the LEDs on the h1940.
+
 comment "LED Triggers"
 
 config LEDS_TRIGGERS
diff --git a/drivers/leds/Makefile b/drivers/leds/Makefile
index 500de3dc962a..377fe709216d 100644
--- a/drivers/leds/Makefile
+++ b/drivers/leds/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_LEDS_S3C24XX)		+= leds-s3c24xx.o
 obj-$(CONFIG_LEDS_AMS_DELTA)            += leds-ams-delta.o
 obj-$(CONFIG_LEDS_NET48XX)              += leds-net48xx.o
 obj-$(CONFIG_LEDS_WRAP)                 += leds-wrap.o
+obj-$(CONFIG_LEDS_H1940)                += leds-h1940.o
 
 # LED Triggers
 obj-$(CONFIG_LEDS_TRIGGER_TIMER)        += ledtrig-timer.o
diff --git a/drivers/leds/leds-h1940.c b/drivers/leds/leds-h1940.c
new file mode 100644
index 000000000000..1d49d2ade557
--- /dev/null
+++ b/drivers/leds/leds-h1940.c
@@ -0,0 +1,163 @@
+/*
+ * drivers/leds/h1940-leds.c
+ * Copyright (c) Arnaud Patard <arnaud.patard@rtp-net.org>
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file COPYING in the main directory of this archive for
+ * more details.
+ *
+ * H1940 leds driver
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/delay.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/leds.h>
+#include <asm/arch/regs-gpio.h>
+#include <asm/hardware.h>
+#include <asm/arch/h1940-latch.h>
+
+/*
+ * Green led.
+ */
+void h1940_greenled_set(struct led_classdev *led_dev, enum led_brightness value)
+{
+        switch (value) {
+                case LED_HALF:
+                        h1940_latch_control(0,H1940_LATCH_LED_FLASH);
+                        s3c2410_gpio_setpin(S3C2410_GPA7,1);
+                        break;
+                case LED_FULL:
+                        h1940_latch_control(0,H1940_LATCH_LED_GREEN);
+                        s3c2410_gpio_setpin(S3C2410_GPA7,1);
+                        break;
+                default:
+                case LED_OFF:
+                        h1940_latch_control(H1940_LATCH_LED_FLASH,0);
+                        h1940_latch_control(H1940_LATCH_LED_GREEN,0);
+                        s3c2410_gpio_setpin(S3C2410_GPA7,0);
+                        break;
+        }
+}
+
+static struct led_classdev h1940_greenled = {
+        .name                   = "h1940:green",
+        .brightness_set         = h1940_greenled_set,
+        .default_trigger        = "h1940-charger",
+};
+
+/*
+ * Red led.
+ */
+void h1940_redled_set(struct led_classdev *led_dev, enum led_brightness value)
+{
+        switch (value) {
+                case LED_HALF:
+                        h1940_latch_control(0,H1940_LATCH_LED_FLASH);
+                        s3c2410_gpio_setpin(S3C2410_GPA1,1);
+                        break;
+                case LED_FULL:
+                        h1940_latch_control(0,H1940_LATCH_LED_RED);
+                        s3c2410_gpio_setpin(S3C2410_GPA1,1);
+                        break;
+                default:
+                case LED_OFF:
+                        h1940_latch_control(H1940_LATCH_LED_FLASH,0);
+                        h1940_latch_control(H1940_LATCH_LED_RED,0);
+                        s3c2410_gpio_setpin(S3C2410_GPA1,0);
+                        break;
+        }
+}
+
+static struct led_classdev h1940_redled = {
+        .name                   = "h1940:red",
+        .brightness_set         = h1940_redled_set,
+        .default_trigger        = "h1940-charger",
+};
+
+/*
+ * Blue led.
+ * (it can only be blue flashing led)
+ */
+void h1940_blueled_set(struct led_classdev *led_dev, enum led_brightness value)
+{
+        if (value) {
+                /* flashing Blue */
+                h1940_latch_control(0,H1940_LATCH_LED_FLASH);
+                s3c2410_gpio_setpin(S3C2410_GPA3,1);
+        } else {
+                h1940_latch_control(H1940_LATCH_LED_FLASH,0);
+                s3c2410_gpio_setpin(S3C2410_GPA3,0);
+        }
+
+}
+
+static struct led_classdev h1940_blueled = {
+        .name                   = "h1940:blue",
+        .brightness_set         = h1940_blueled_set,
+        .default_trigger        = "h1940-bluetooth",
+};
+
+static int __init h1940leds_probe(struct platform_device *pdev)
+{
+        int ret;
+
+        ret = led_classdev_register(&pdev->dev, &h1940_greenled);
+        if (ret)
+                goto err_green;
+
+        ret = led_classdev_register(&pdev->dev, &h1940_redled);
+        if (ret)
+                goto err_red;
+
+        ret = led_classdev_register(&pdev->dev, &h1940_blueled);
+        if (ret)
+                goto err_blue;
+
+        return 0;
+
+err_blue:
+        led_classdev_unregister(&h1940_redled);
+err_red:
+        led_classdev_unregister(&h1940_greenled);
+err_green:
+        return ret;
+}
+
+static int h1940leds_remove(struct platform_device *pdev)
+{
+        led_classdev_unregister(&h1940_greenled);
+        led_classdev_unregister(&h1940_redled);
+        led_classdev_unregister(&h1940_blueled);
+        return 0;
+}
+
+
+static struct platform_driver h1940leds_driver = {
+        .driver         = {
+                .name   = "h1940-leds",
+        },
+        .probe          = h1940leds_probe,
+        .remove         = h1940leds_remove,
+};
+
+
+static int __init h1940leds_init(void)
+{
+        return platform_driver_register(&h1940leds_driver);
+}
+
+static void __exit h1940leds_exit(void)
+{
+        platform_driver_unregister(&h1940leds_driver);
+}
+
+module_init(h1940leds_init);
+module_exit(h1940leds_exit);
+
+MODULE_AUTHOR("Arnaud Patard <arnaud.patard@rtp-net.org>");
+MODULE_DESCRIPTION("LED driver for the iPAQ H1940");
+MODULE_LICENSE("GPL");