aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorAndrew Victor <linux@maxim.org.za>2008-04-15 21:13:33 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-04-17 15:58:25 +0100
commitfdb72fd84c26438a7dd754a1cc74890aca7f1b77 (patch)
treed3cfa375d72baf7fb4491eadb364428e8dfb56ab
parentLinux 2.6.25-rc7 (diff)
downloadlinux-dev-fdb72fd84c26438a7dd754a1cc74890aca7f1b77.tar.xz
linux-dev-fdb72fd84c26438a7dd754a1cc74890aca7f1b77.zip
[ARM] 4981/1: [KS8695] Simple LED driver
Simple gpio-connected LED driver for KS8695 platforms. (Based on old AT91 LED driver) Signed-off-by: Andrew Victor <linux@maxim.org.za> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
-rw-r--r--arch/arm/mach-ks8695/Makefile3
-rw-r--r--arch/arm/mach-ks8695/devices.c21
-rw-r--r--arch/arm/mach-ks8695/leds.c94
-rw-r--r--include/asm-arm/arch-ks8695/devices.h5
4 files changed, 123 insertions, 0 deletions
diff --git a/arch/arm/mach-ks8695/Makefile b/arch/arm/mach-ks8695/Makefile
index 730a3af12c98..ade42b73afbb 100644
--- a/arch/arm/mach-ks8695/Makefile
+++ b/arch/arm/mach-ks8695/Makefile
@@ -11,5 +11,8 @@ obj- :=
# PCI support is optional
obj-$(CONFIG_PCI) += pci.o
+# LEDs
+obj-$(CONFIG_LEDS) += leds.o
+
# Board-specific support
obj-$(CONFIG_MACH_KS8695) += board-micrel.o
diff --git a/arch/arm/mach-ks8695/devices.c b/arch/arm/mach-ks8695/devices.c
index 386593f8ac65..3db2ec61d06f 100644
--- a/arch/arm/mach-ks8695/devices.c
+++ b/arch/arm/mach-ks8695/devices.c
@@ -176,6 +176,27 @@ static void __init ks8695_add_device_watchdog(void) {}
#endif
+/* --------------------------------------------------------------------
+ * LEDs
+ * -------------------------------------------------------------------- */
+
+#if defined(CONFIG_LEDS)
+short ks8695_leds_cpu = -1;
+short ks8695_leds_timer = -1;
+
+void __init ks8695_init_leds(u8 cpu_led, u8 timer_led)
+{
+ /* Enable GPIO to access the LEDs */
+ gpio_direction_output(cpu_led, 1);
+ gpio_direction_output(timer_led, 1);
+
+ ks8695_leds_cpu = cpu_led;
+ ks8695_leds_timer = timer_led;
+}
+#else
+void __init ks8695_init_leds(u8 cpu_led, u8 timer_led) {}
+#endif
+
/* -------------------------------------------------------------------- */
/*
diff --git a/arch/arm/mach-ks8695/leds.c b/arch/arm/mach-ks8695/leds.c
new file mode 100644
index 000000000000..d61762ae50d8
--- /dev/null
+++ b/arch/arm/mach-ks8695/leds.c
@@ -0,0 +1,94 @@
+/*
+ * LED driver for KS8695-based boards.
+ *
+ * Copyright (C) Andrew Victor
+ *
+ * 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/module.h>
+#include <linux/init.h>
+
+#include <asm/mach-types.h>
+#include <asm/leds.h>
+#include <asm/arch/devices.h>
+#include <asm/arch/gpio.h>
+
+
+static inline void ks8695_led_on(unsigned int led)
+{
+ gpio_set_value(led, 0);
+}
+
+static inline void ks8695_led_off(unsigned int led)
+{
+ gpio_set_value(led, 1);
+}
+
+static inline void ks8695_led_toggle(unsigned int led)
+{
+ unsigned long is_off = gpio_get_value(led);
+ if (is_off)
+ ks8695_led_on(led);
+ else
+ ks8695_led_off(led);
+}
+
+
+/*
+ * Handle LED events.
+ */
+static void ks8695_leds_event(led_event_t evt)
+{
+ unsigned long flags;
+
+ local_irq_save(flags);
+
+ switch(evt) {
+ case led_start: /* System startup */
+ ks8695_led_on(ks8695_leds_cpu);
+ break;
+
+ case led_stop: /* System stop / suspend */
+ ks8695_led_off(ks8695_leds_cpu);
+ break;
+
+#ifdef CONFIG_LEDS_TIMER
+ case led_timer: /* Every 50 timer ticks */
+ ks8695_led_toggle(ks8695_leds_timer);
+ break;
+#endif
+
+#ifdef CONFIG_LEDS_CPU
+ case led_idle_start: /* Entering idle state */
+ ks8695_led_off(ks8695_leds_cpu);
+ break;
+
+ case led_idle_end: /* Exit idle state */
+ ks8695_led_on(ks8695_leds_cpu);
+ break;
+#endif
+
+ default:
+ break;
+ }
+
+ local_irq_restore(flags);
+}
+
+
+static int __init leds_init(void)
+{
+ if ((ks8695_leds_timer == -1) || (ks8695_leds_cpu == -1))
+ return -ENODEV;
+
+ leds_event = ks8695_leds_event;
+
+ leds_event(led_start);
+ return 0;
+}
+
+__initcall(leds_init);
diff --git a/include/asm-arm/arch-ks8695/devices.h b/include/asm-arm/arch-ks8695/devices.h
index b0364dce463f..7ad2c656e162 100644
--- a/include/asm-arm/arch-ks8695/devices.h
+++ b/include/asm-arm/arch-ks8695/devices.h
@@ -18,6 +18,11 @@ extern void __init ks8695_add_device_wan(void);
extern void __init ks8695_add_device_lan(void);
extern void __init ks8695_add_device_hpna(void);
+ /* LEDs */
+extern short ks8695_leds_cpu;
+extern short ks8695_leds_timer;
+extern void __init ks8695_init_leds(u8 cpu_led, u8 timer_led);
+
/* PCI */
#define KS8695_MODE_PCI 0
#define KS8695_MODE_MINIPCI 1