arch/arm/mach-at91/leds.c

   1 /*
   2  * LED driver for Atmel AT91-based boards.
   3  *
   4  *  Copyright (C) SAN People (Pty) Ltd
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10 */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/platform_device.h>
  16
  17 #include <mach/board.h>
  18 #include <mach/gpio.h>
  19
  20
  21 /* ------------------------------------------------------------------------- */
  22
  23 #if defined(CONFIG_NEW_LEDS)
  24
  25 /*
  26  * New cross-platform LED support.
  27  */
  28
  29 static struct gpio_led_platform_data led_data;
  30
  31 static struct platform_device at91_gpio_leds_device = {
  32         .name                   = "leds-gpio",
  33         .id                     = -1,
  34         .dev.platform_data      = &led_data,
  35 };
  36
  37 void __init at91_gpio_leds(struct gpio_led *leds, int nr)
  38 {
  39         int i;
  40
  41         if (!nr)
  42                 return;
  43
  44         for (i = 0; i < nr; i++)
  45                 at91_set_gpio_output(leds[i].gpio, leds[i].active_low);
  46
  47         led_data.leds = leds;
  48         led_data.num_leds = nr;
  49         platform_device_register(&at91_gpio_leds_device);
  50 }
  51
  52 #else
  53 void __init at91_gpio_leds(struct gpio_led *leds, int nr) {}
  54 #endif
  55
  56
  57 /* ------------------------------------------------------------------------- */
  58
  59 #if defined (CONFIG_LEDS_ATMEL_PWM)
  60
  61 /*
  62  * PWM Leds
  63  */
  64
  65 static struct gpio_led_platform_data pwm_led_data;
  66
  67 static struct platform_device at91_pwm_leds_device = {
  68         .name                   = "leds-atmel-pwm",
  69         .id                     = -1,
  70         .dev.platform_data      = &pwm_led_data,
  71 };
  72
  73 void __init at91_pwm_leds(struct gpio_led *leds, int nr)
  74 {
  75         int i;
  76         u32 pwm_mask = 0;
  77
  78         if (!nr)
  79                 return;
  80
  81         for (i = 0; i < nr; i++)
  82                 pwm_mask |= (1 << leds[i].gpio);
  83
  84         pwm_led_data.leds = leds;
  85         pwm_led_data.num_leds = nr;
  86
  87         at91_add_device_pwm(pwm_mask);
  88         platform_device_register(&at91_pwm_leds_device);
  89 }
  90 #else
  91 void __init at91_pwm_leds(struct gpio_led *leds, int nr){}
  92 #endif
  93
  94
  95 /* ------------------------------------------------------------------------- */
  96
  97 #if defined(CONFIG_LEDS)
  98
  99 #include <asm/leds.h>
 100
 101 /*
 102  * Old ARM-specific LED framework; not fully functional when generic time is
 103  * in use.
 104  */
 105
 106 static u8 at91_leds_cpu;
 107 static u8 at91_leds_timer;
 108
 109 static inline void at91_led_on(unsigned int led)
 110 {
 111         at91_set_gpio_value(led, 0);
 112 }
 113
 114 static inline void at91_led_off(unsigned int led)
 115 {
 116         at91_set_gpio_value(led, 1);
 117 }
 118
 119 static inline void at91_led_toggle(unsigned int led)
 120 {
 121         unsigned long is_off = at91_get_gpio_value(led);
 122         if (is_off)
 123                 at91_led_on(led);
 124         else
 125                 at91_led_off(led);
 126 }
 127
 128
 129 /*
 130  * Handle LED events.
 131  */
 132 static void at91_leds_event(led_event_t evt)
 133 {
 134         unsigned long flags;
 135
 136         local_irq_save(flags);
 137
 138         switch(evt) {
 139         case led_start:         /* System startup */
 140                 at91_led_on(at91_leds_cpu);
 141                 break;
 142
 143         case led_stop:          /* System stop / suspend */
 144                 at91_led_off(at91_leds_cpu);
 145                 break;
 146
 147 #ifdef CONFIG_LEDS_TIMER
 148         case led_timer:         /* Every 50 timer ticks */
 149                 at91_led_toggle(at91_leds_timer);
 150                 break;
 151 #endif
 152
 153 #ifdef CONFIG_LEDS_CPU
 154         case led_idle_start:    /* Entering idle state */
 155                 at91_led_off(at91_leds_cpu);
 156                 break;
 157
 158         case led_idle_end:      /* Exit idle state */
 159                 at91_led_on(at91_leds_cpu);
 160                 break;
 161 #endif
 162
 163         default:
 164                 break;
 165         }
 166
 167         local_irq_restore(flags);
 168 }
 169
 170
 171 static int __init leds_init(void)
 172 {
 173         if (!at91_leds_timer || !at91_leds_cpu)
 174                 return -ENODEV;
 175
 176         leds_event = at91_leds_event;
 177
 178         leds_event(led_start);
 179         return 0;
 180 }
 181
 182 __initcall(leds_init);
 183
 184
 185 void __init at91_init_leds(u8 cpu_led, u8 timer_led)
 186 {
 187         /* Enable GPIO to access the LEDs */
 188         at91_set_gpio_output(cpu_led, 1);
 189         at91_set_gpio_output(timer_led, 1);
 190
 191         at91_leds_cpu   = cpu_led;
 192         at91_leds_timer = timer_led;
 193 }
 194
 195 #else
 196 void __init at91_init_leds(u8 cpu_led, u8 timer_led) {}
 197 #endif