ARM: 6235/2: driver for the LEDs found in the later ARM refdesigns

This adds a simple driver supporting the new LED framework with
triggers and all for the RealView and Versatile platforms. The
RealView and Versatile platform drivers were arranged to compile
for all-but-integrator as a side effect since the Integrator has
a different LED driver.

Signed-off-by: Linus Walleij <triad@df.lth.se>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/arch/arm/plat-versatile/Makefile b/arch/arm/plat-versatile/Makefile
index 9b1a66816aa652d97460bca5feafe5ec97069d61..505a8f89601c720ce2471e03f5380a17dcb0e2fc 100644 (file)
--- a/arch/arm/plat-versatile/Makefile
+++ b/arch/arm/plat-versatile/Makefile
@@ -1,4 +1,7 @@
 obj-y  := clock.o
 obj-$(CONFIG_ARM_TIMER_SP804) += timer-sp.o
-obj-$(CONFIG_ARCH_REALVIEW) += sched-clock.o
-obj-$(CONFIG_ARCH_VERSATILE) += sched-clock.o
+# For all but the Integrator, compile these
+ifeq ($(CONFIG_ARCH_INTEGRATOR),)
+obj-y += sched-clock.o
+obj-$(CONFIG_LEDS_CLASS) += leds.o
+endif

diff --git a/arch/arm/plat-versatile/leds.c b/arch/arm/plat-versatile/leds.c
new file mode 100644 (file)
index 0000000..3169fa5
--- /dev/null
+++ b/arch/arm/plat-versatile/leds.c
@@ -0,0 +1,103 @@
+/*
+ * Driver for the 8 user LEDs found on the RealViews and Versatiles
+ * Based on DaVinci's DM365 board code
+ *
+ * License terms: GNU General Public License (GPL) version 2
+ * Author: Linus Walleij <triad@df.lth.se>
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/leds.h>
+
+#include <mach/hardware.h>
+#include <mach/platform.h>
+
+#ifdef VERSATILE_SYS_BASE
+#define LEDREG (__io_address(VERSATILE_SYS_BASE) + VERSATILE_SYS_LED_OFFSET)
+#endif
+
+#ifdef REALVIEW_SYS_BASE
+#define LEDREG (__io_address(REALVIEW_SYS_BASE) + REALVIEW_SYS_LED_OFFSET)
+#endif
+
+struct versatile_led {
+       struct led_classdev     cdev;
+       u8                      mask;
+};
+
+/*
+ * The triggers lines up below will only be used if the
+ * LED triggers are compiled in.
+ */
+static const struct {
+       const char *name;
+       const char *trigger;
+} versatile_leds[] = {
+       { "versatile:0", "heartbeat", },
+       { "versatile:1", "mmc0", },
+       { "versatile:2", },
+       { "versatile:3", },
+       { "versatile:4", },
+       { "versatile:5", },
+       { "versatile:6", },
+       { "versatile:7", },
+};
+
+static void versatile_led_set(struct led_classdev *cdev,
+                             enum led_brightness b)
+{
+       struct versatile_led *led = container_of(cdev,
+                                                struct versatile_led, cdev);
+       u32 reg = readl(LEDREG);
+
+       if (b != LED_OFF)
+               reg |= led->mask;
+       else
+               reg &= ~led->mask;
+       writel(reg, LEDREG);
+}
+
+static enum led_brightness versatile_led_get(struct led_classdev *cdev)
+{
+       struct versatile_led *led = container_of(cdev,
+                                                struct versatile_led, cdev);
+       u32 reg = readl(LEDREG);
+
+       return (reg & led->mask) ? LED_FULL : LED_OFF;
+}
+
+static int __init versatile_leds_init(void)
+{
+       int i;
+
+       /* All ON */
+       writel(0xff, LEDREG);
+       for (i = 0; i < ARRAY_SIZE(versatile_leds); i++) {
+               struct versatile_led *led;
+
+               led = kzalloc(sizeof(*led), GFP_KERNEL);
+               if (!led)
+                       break;
+
+               led->cdev.name = versatile_leds[i].name;
+               led->cdev.brightness_set = versatile_led_set;
+               led->cdev.brightness_get = versatile_led_get;
+               led->cdev.default_trigger = versatile_leds[i].trigger;
+               led->mask = BIT(i);
+
+               if (led_classdev_register(NULL, &led->cdev) < 0) {
+                       kfree(led);
+                       break;
+               }
+       }
+
+       return 0;
+}
+
+/*
+ * Since we may have triggers on any subsystem, defer registration
+ * until after subsystem_init.
+ */
+fs_initcall(versatile_leds_init);