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