summaryrefslogtreecommitdiffstats
path: root/arch/arm/mach-omap/leds-osk.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-omap/leds-osk.c')
-rw-r--r--arch/arm/mach-omap/leds-osk.c198
1 files changed, 198 insertions, 0 deletions
diff --git a/arch/arm/mach-omap/leds-osk.c b/arch/arm/mach-omap/leds-osk.c
new file mode 100644
index 000000000000..f5177f430793
--- /dev/null
+++ b/arch/arm/mach-omap/leds-osk.c
@@ -0,0 +1,198 @@
+/*
+ * linux/arch/arm/mach-omap/leds-osk.c
+ *
+ * LED driver for OSK, and optionally Mistral QVGA, boards
+ */
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/workqueue.h>
+
+#include <asm/hardware.h>
+#include <asm/leds.h>
+#include <asm/system.h>
+
+#include <asm/arch/gpio.h>
+#include <asm/arch/tps65010.h>
+
+#include "leds.h"
+
+
+#define LED_STATE_ENABLED (1 << 0)
+#define LED_STATE_CLAIMED (1 << 1)
+static u8 led_state;
+
+#define GREEN_LED (1 << 0) /* TPS65010 LED1 */
+#define AMBER_LED (1 << 1) /* TPS65010 LED2 */
+#define RED_LED (1 << 2) /* TPS65010 GPIO2 */
+#define TIMER_LED (1 << 3) /* Mistral board */
+#define IDLE_LED (1 << 4) /* Mistral board */
+static u8 hw_led_state;
+
+
+/* TPS65010 leds are changed using i2c -- from a task context.
+ * Using one of these for the "idle" LED would be impractical...
+ */
+#define TPS_LEDS (GREEN_LED | RED_LED | AMBER_LED)
+
+static u8 tps_leds_change;
+
+static void tps_work(void *unused)
+{
+ for (;;) {
+ u8 leds;
+
+ local_irq_disable();
+ leds = tps_leds_change;
+ tps_leds_change = 0;
+ local_irq_enable();
+
+ if (!leds)
+ break;
+
+ /* careful: the set_led() value is on/off/blink */
+ if (leds & GREEN_LED)
+ tps65010_set_led(LED1, !!(hw_led_state & GREEN_LED));
+ if (leds & AMBER_LED)
+ tps65010_set_led(LED2, !!(hw_led_state & AMBER_LED));
+
+ /* the gpio led doesn't have that issue */
+ if (leds & RED_LED)
+ tps65010_set_gpio_out_value(GPIO2,
+ !(hw_led_state & RED_LED));
+ }
+}
+
+static DECLARE_WORK(work, tps_work, NULL);
+
+#ifdef CONFIG_FB_OMAP
+
+/* For now, all system indicators require the Mistral board, since that
+ * LED can be manipulated without a task context. This LED is either red,
+ * or green, but not both; it can't give the full "disco led" effect.
+ */
+
+#define GPIO_LED_RED 3
+#define GPIO_LED_GREEN OMAP_MPUIO(4)
+
+static void mistral_setled(void)
+{
+ int red = 0;
+ int green = 0;
+
+ if (hw_led_state & TIMER_LED)
+ red = 1;
+ else if (hw_led_state & IDLE_LED)
+ green = 1;
+ // else both sides are disabled
+
+ omap_set_gpio_dataout(GPIO_LED_GREEN, green);
+ omap_set_gpio_dataout(GPIO_LED_RED, red);
+}
+
+#endif
+
+void osk_leds_event(led_event_t evt)
+{
+ unsigned long flags;
+ u16 leds;
+
+ local_irq_save(flags);
+
+ if (!(led_state & LED_STATE_ENABLED) && evt != led_start)
+ goto done;
+
+ leds = hw_led_state;
+ switch (evt) {
+ case led_start:
+ led_state |= LED_STATE_ENABLED;
+ hw_led_state = 0;
+ leds = ~0;
+ break;
+
+ case led_halted:
+ case led_stop:
+ led_state &= ~LED_STATE_ENABLED;
+ hw_led_state = 0;
+ // NOTE: work may still be pending!!
+ break;
+
+ case led_claim:
+ led_state |= LED_STATE_CLAIMED;
+ hw_led_state = 0;
+ leds = ~0;
+ break;
+
+ case led_release:
+ led_state &= ~LED_STATE_CLAIMED;
+ hw_led_state = 0;
+ break;
+
+#ifdef CONFIG_FB_OMAP
+
+#ifdef CONFIG_LEDS_TIMER
+ case led_timer:
+ hw_led_state ^= TIMER_LED;
+ mistral_setled();
+ break;
+#endif
+
+#ifdef CONFIG_LEDS_CPU
+ case led_idle_start:
+ hw_led_state |= IDLE_LED;
+ mistral_setled();
+ break;
+
+ case led_idle_end:
+ hw_led_state &= ~IDLE_LED;
+ mistral_setled();
+ break;
+#endif
+
+#endif /* CONFIG_FB_OMAP */
+
+ /* "green" == tps LED1 (leftmost, normally power-good)
+ * works only with DC adapter, not on battery power!
+ */
+ case led_green_on:
+ if (led_state & LED_STATE_CLAIMED)
+ hw_led_state |= GREEN_LED;
+ break;
+ case led_green_off:
+ if (led_state & LED_STATE_CLAIMED)
+ hw_led_state &= ~GREEN_LED;
+ break;
+
+ /* "amber" == tps LED2 (middle) */
+ case led_amber_on:
+ if (led_state & LED_STATE_CLAIMED)
+ hw_led_state |= AMBER_LED;
+ break;
+ case led_amber_off:
+ if (led_state & LED_STATE_CLAIMED)
+ hw_led_state &= ~AMBER_LED;
+ break;
+
+ /* "red" == LED on tps gpio3 (rightmost) */
+ case led_red_on:
+ if (led_state & LED_STATE_CLAIMED)
+ hw_led_state |= RED_LED;
+ break;
+ case led_red_off:
+ if (led_state & LED_STATE_CLAIMED)
+ hw_led_state &= ~RED_LED;
+ break;
+
+ default:
+ break;
+ }
+
+ leds ^= hw_led_state;
+ leds &= TPS_LEDS;
+ if (leds && (led_state & LED_STATE_CLAIMED)) {
+ tps_leds_change |= leds;
+ schedule_work(&work);
+ }
+
+done:
+ local_irq_restore(flags);
+}
OpenPOWER on IntegriCloud