Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Tony Lindgren | 7c38cf0 | 2005-09-08 23:07:38 +0100 | [diff] [blame] | 2 | * linux/arch/arm/mach-omap1/leds-osk.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * LED driver for OSK, and optionally Mistral QVGA, boards |
| 5 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | #include <linux/init.h> |
| 7 | #include <linux/workqueue.h> |
| 8 | |
| 9 | #include <asm/hardware.h> |
| 10 | #include <asm/leds.h> |
| 11 | #include <asm/system.h> |
| 12 | |
| 13 | #include <asm/arch/gpio.h> |
| 14 | #include <asm/arch/tps65010.h> |
| 15 | |
| 16 | #include "leds.h" |
| 17 | |
| 18 | |
| 19 | #define LED_STATE_ENABLED (1 << 0) |
| 20 | #define LED_STATE_CLAIMED (1 << 1) |
| 21 | static u8 led_state; |
| 22 | |
| 23 | #define GREEN_LED (1 << 0) /* TPS65010 LED1 */ |
| 24 | #define AMBER_LED (1 << 1) /* TPS65010 LED2 */ |
| 25 | #define RED_LED (1 << 2) /* TPS65010 GPIO2 */ |
| 26 | #define TIMER_LED (1 << 3) /* Mistral board */ |
| 27 | #define IDLE_LED (1 << 4) /* Mistral board */ |
| 28 | static u8 hw_led_state; |
| 29 | |
| 30 | |
| 31 | /* TPS65010 leds are changed using i2c -- from a task context. |
| 32 | * Using one of these for the "idle" LED would be impractical... |
| 33 | */ |
| 34 | #define TPS_LEDS (GREEN_LED | RED_LED | AMBER_LED) |
| 35 | |
| 36 | static u8 tps_leds_change; |
| 37 | |
David Howells | 6d5aefb | 2006-12-05 19:36:26 +0000 | [diff] [blame] | 38 | static void tps_work(struct work_struct *unused) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | { |
| 40 | for (;;) { |
| 41 | u8 leds; |
| 42 | |
| 43 | local_irq_disable(); |
| 44 | leds = tps_leds_change; |
| 45 | tps_leds_change = 0; |
| 46 | local_irq_enable(); |
| 47 | |
| 48 | if (!leds) |
| 49 | break; |
| 50 | |
| 51 | /* careful: the set_led() value is on/off/blink */ |
| 52 | if (leds & GREEN_LED) |
| 53 | tps65010_set_led(LED1, !!(hw_led_state & GREEN_LED)); |
| 54 | if (leds & AMBER_LED) |
| 55 | tps65010_set_led(LED2, !!(hw_led_state & AMBER_LED)); |
| 56 | |
| 57 | /* the gpio led doesn't have that issue */ |
| 58 | if (leds & RED_LED) |
| 59 | tps65010_set_gpio_out_value(GPIO2, |
| 60 | !(hw_led_state & RED_LED)); |
| 61 | } |
| 62 | } |
| 63 | |
David Howells | 6d5aefb | 2006-12-05 19:36:26 +0000 | [diff] [blame] | 64 | static DECLARE_WORK(work, tps_work); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | |
Tony Lindgren | 7c38cf0 | 2005-09-08 23:07:38 +0100 | [diff] [blame] | 66 | #ifdef CONFIG_OMAP_OSK_MISTRAL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
| 68 | /* For now, all system indicators require the Mistral board, since that |
| 69 | * LED can be manipulated without a task context. This LED is either red, |
| 70 | * or green, but not both; it can't give the full "disco led" effect. |
| 71 | */ |
| 72 | |
| 73 | #define GPIO_LED_RED 3 |
| 74 | #define GPIO_LED_GREEN OMAP_MPUIO(4) |
| 75 | |
| 76 | static void mistral_setled(void) |
| 77 | { |
| 78 | int red = 0; |
| 79 | int green = 0; |
| 80 | |
| 81 | if (hw_led_state & TIMER_LED) |
| 82 | red = 1; |
| 83 | else if (hw_led_state & IDLE_LED) |
| 84 | green = 1; |
| 85 | // else both sides are disabled |
| 86 | |
| 87 | omap_set_gpio_dataout(GPIO_LED_GREEN, green); |
| 88 | omap_set_gpio_dataout(GPIO_LED_RED, red); |
| 89 | } |
| 90 | |
| 91 | #endif |
| 92 | |
| 93 | void osk_leds_event(led_event_t evt) |
| 94 | { |
| 95 | unsigned long flags; |
| 96 | u16 leds; |
| 97 | |
| 98 | local_irq_save(flags); |
| 99 | |
| 100 | if (!(led_state & LED_STATE_ENABLED) && evt != led_start) |
| 101 | goto done; |
| 102 | |
| 103 | leds = hw_led_state; |
| 104 | switch (evt) { |
| 105 | case led_start: |
| 106 | led_state |= LED_STATE_ENABLED; |
| 107 | hw_led_state = 0; |
| 108 | leds = ~0; |
| 109 | break; |
| 110 | |
| 111 | case led_halted: |
| 112 | case led_stop: |
| 113 | led_state &= ~LED_STATE_ENABLED; |
| 114 | hw_led_state = 0; |
| 115 | // NOTE: work may still be pending!! |
| 116 | break; |
| 117 | |
| 118 | case led_claim: |
| 119 | led_state |= LED_STATE_CLAIMED; |
| 120 | hw_led_state = 0; |
| 121 | leds = ~0; |
| 122 | break; |
| 123 | |
| 124 | case led_release: |
| 125 | led_state &= ~LED_STATE_CLAIMED; |
| 126 | hw_led_state = 0; |
| 127 | break; |
| 128 | |
Tony Lindgren | 7c38cf0 | 2005-09-08 23:07:38 +0100 | [diff] [blame] | 129 | #ifdef CONFIG_OMAP_OSK_MISTRAL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | case led_timer: |
| 132 | hw_led_state ^= TIMER_LED; |
| 133 | mistral_setled(); |
| 134 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | case led_idle_start: |
| 137 | hw_led_state |= IDLE_LED; |
| 138 | mistral_setled(); |
| 139 | break; |
| 140 | |
| 141 | case led_idle_end: |
| 142 | hw_led_state &= ~IDLE_LED; |
| 143 | mistral_setled(); |
| 144 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
Tony Lindgren | 7c38cf0 | 2005-09-08 23:07:38 +0100 | [diff] [blame] | 146 | #endif /* CONFIG_OMAP_OSK_MISTRAL */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | |
| 148 | /* "green" == tps LED1 (leftmost, normally power-good) |
| 149 | * works only with DC adapter, not on battery power! |
| 150 | */ |
| 151 | case led_green_on: |
| 152 | if (led_state & LED_STATE_CLAIMED) |
| 153 | hw_led_state |= GREEN_LED; |
| 154 | break; |
| 155 | case led_green_off: |
| 156 | if (led_state & LED_STATE_CLAIMED) |
| 157 | hw_led_state &= ~GREEN_LED; |
| 158 | break; |
| 159 | |
| 160 | /* "amber" == tps LED2 (middle) */ |
| 161 | case led_amber_on: |
| 162 | if (led_state & LED_STATE_CLAIMED) |
| 163 | hw_led_state |= AMBER_LED; |
| 164 | break; |
| 165 | case led_amber_off: |
| 166 | if (led_state & LED_STATE_CLAIMED) |
| 167 | hw_led_state &= ~AMBER_LED; |
| 168 | break; |
| 169 | |
| 170 | /* "red" == LED on tps gpio3 (rightmost) */ |
| 171 | case led_red_on: |
| 172 | if (led_state & LED_STATE_CLAIMED) |
| 173 | hw_led_state |= RED_LED; |
| 174 | break; |
| 175 | case led_red_off: |
| 176 | if (led_state & LED_STATE_CLAIMED) |
| 177 | hw_led_state &= ~RED_LED; |
| 178 | break; |
| 179 | |
| 180 | default: |
| 181 | break; |
| 182 | } |
| 183 | |
| 184 | leds ^= hw_led_state; |
| 185 | leds &= TPS_LEDS; |
| 186 | if (leds && (led_state & LED_STATE_CLAIMED)) { |
| 187 | tps_leds_change |= leds; |
| 188 | schedule_work(&work); |
| 189 | } |
| 190 | |
| 191 | done: |
| 192 | local_irq_restore(flags); |
| 193 | } |