arch/arm/mach-omap1/leds-osk.c

   1 /*
   2  * linux/arch/arm/mach-omap1/leds-osk.c
   3  *
   4  * LED driver for OSK, and optionally Mistral QVGA, boards
   5  */
   6 #include <linux/init.h>
   7 #include <linux/workqueue.h>
   8 #include <linux/i2c/tps65010.h>
   9
  10 #include <asm/hardware.h>
  11 #include <asm/leds.h>
  12 #include <asm/system.h>
  13
  14 #include <asm/arch/gpio.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
  38 static void tps_work(struct work_struct *unused)
  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
  64 static DECLARE_WORK(work, tps_work);
  65
  66 #ifdef  CONFIG_OMAP_OSK_MISTRAL
  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
 129 #ifdef  CONFIG_OMAP_OSK_MISTRAL
 130
 131         case led_timer:
 132                 hw_led_state ^= TIMER_LED;
 133                 mistral_setled();
 134                 break;
 135
 136         case led_idle_start:    /* idle == off */
 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;
 145
 146 #endif  /* CONFIG_OMAP_OSK_MISTRAL */
 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 }