projects / mirror_ubuntu-bionic-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * arch/arm/kernel/leds-shark.c | |
| 3 | * by Alexander Schulz | |
| 4 | * | |
| 5 | * derived from: | |
| 6 | * arch/arm/kernel/leds-footbridge.c | |
| 7 | * Copyright (C) 1998-1999 Russell King | |
| 8 | * | |
| 9 | * DIGITAL Shark LED control routines. | |
| 10 | * | |
| 11 | * The leds use is as follows: | |
| 12 | * - Green front - toggles state every 50 timer interrupts | |
| 13 | * - Amber front - Unused, this is a dual color led (Amber/Green) | |
| 14 | * - Amber back - On if system is not idle | |
| 15 | * | |
| 16 | * Changelog: | |
| 17 | */ | |
| 18 | #include <linux/config.h> | |
| 19 | #include <linux/kernel.h> | |
| 20 | #include <linux/module.h> | |
| 21 | #include <linux/init.h> | |
| 22 | #include <linux/spinlock.h> | |
| 23 | #include <linux/ioport.h> | |
| 24 | ||
| 25 | #include <asm/hardware.h> | |
| 26 | #include <asm/leds.h> | |
| 27 | #include <asm/io.h> | |
| 28 | #include <asm/system.h> | |
| 29 | ||
| 30 | #define LED_STATE_ENABLED 1 | |
| 31 | #define LED_STATE_CLAIMED 2 | |
| 32 | static char led_state; | |
| 33 | static short hw_led_state; | |
| 34 | static short saved_state; | |
| 35 | ||
| 36 | static DEFINE_SPINLOCK(leds_lock); | |
| 37 | ||
| 38 | short sequoia_read(int addr) { | |
| 39 | outw(addr,0x24); | |
| 40 | return inw(0x26); | |
| 41 | } | |
| 42 | ||
| 43 | void sequoia_write(short value,short addr) { | |
| 44 | outw(addr,0x24); | |
| 45 | outw(value,0x26); | |
| 46 | } | |
| 47 | ||
| 48 | static void sequoia_leds_event(led_event_t evt) | |
| 49 | { | |
| 50 | unsigned long flags; | |
| 51 | ||
| 52 | spin_lock_irqsave(&leds_lock, flags); | |
| 53 | ||
| 54 | hw_led_state = sequoia_read(0x09); | |
| 55 | ||
| 56 | switch (evt) { | |
| 57 | case led_start: | |
| 58 | hw_led_state |= SEQUOIA_LED_GREEN; | |
| 59 | hw_led_state |= SEQUOIA_LED_AMBER; | |
| 60 | #ifdef CONFIG_LEDS_CPU | |
| 61 | hw_led_state |= SEQUOIA_LED_BACK; | |
| 62 | #else | |
| 63 | hw_led_state &= ~SEQUOIA_LED_BACK; | |
| 64 | #endif | |
| 65 | led_state |= LED_STATE_ENABLED; | |
| 66 | break; | |
| 67 | ||
| 68 | case led_stop: | |
| 69 | hw_led_state &= ~SEQUOIA_LED_BACK; | |
| 70 | hw_led_state |= SEQUOIA_LED_GREEN; | |
| 71 | hw_led_state |= SEQUOIA_LED_AMBER; | |
| 72 | led_state &= ~LED_STATE_ENABLED; | |
| 73 | break; | |
| 74 | ||
| 75 | case led_claim: | |
| 76 | led_state |= LED_STATE_CLAIMED; | |
| 77 | saved_state = hw_led_state; | |
| 78 | hw_led_state &= ~SEQUOIA_LED_BACK; | |
| 79 | hw_led_state |= SEQUOIA_LED_GREEN; | |
| 80 | hw_led_state |= SEQUOIA_LED_AMBER; | |
| 81 | break; | |
| 82 | ||
| 83 | case led_release: | |
| 84 | led_state &= ~LED_STATE_CLAIMED; | |
| 85 | hw_led_state = saved_state; | |
| 86 | break; | |
| 87 | ||
| 88 | #ifdef CONFIG_LEDS_TIMER | |
| 89 | case led_timer: | |
| 90 | if (!(led_state & LED_STATE_CLAIMED)) | |
| 91 | hw_led_state ^= SEQUOIA_LED_GREEN; | |
| 92 | break; | |
| 93 | #endif | |
| 94 | ||
| 95 | #ifdef CONFIG_LEDS_CPU | |
| 96 | case led_idle_start: | |
| 97 | if (!(led_state & LED_STATE_CLAIMED)) | |
| 98 | hw_led_state &= ~SEQUOIA_LED_BACK; | |
| 99 | break; | |
| 100 | ||
| 101 | case led_idle_end: | |
| 102 | if (!(led_state & LED_STATE_CLAIMED)) | |
| 103 | hw_led_state |= SEQUOIA_LED_BACK; | |
| 104 | break; | |
| 105 | #endif | |
| 106 | ||
| 107 | case led_green_on: | |
| 108 | if (led_state & LED_STATE_CLAIMED) | |
| 109 | hw_led_state &= ~SEQUOIA_LED_GREEN; | |
| 110 | break; | |
| 111 | ||
| 112 | case led_green_off: | |
| 113 | if (led_state & LED_STATE_CLAIMED) | |
| 114 | hw_led_state |= SEQUOIA_LED_GREEN; | |
| 115 | break; | |
| 116 | ||
| 117 | case led_amber_on: | |
| 118 | if (led_state & LED_STATE_CLAIMED) | |
| 119 | hw_led_state &= ~SEQUOIA_LED_AMBER; | |
| 120 | break; | |
| 121 | ||
| 122 | case led_amber_off: | |
| 123 | if (led_state & LED_STATE_CLAIMED) | |
| 124 | hw_led_state |= SEQUOIA_LED_AMBER; | |
| 125 | break; | |
| 126 | ||
| 127 | case led_red_on: | |
| 128 | if (led_state & LED_STATE_CLAIMED) | |
| 129 | hw_led_state |= SEQUOIA_LED_BACK; | |
| 130 | break; | |
| 131 | ||
| 132 | case led_red_off: | |
| 133 | if (led_state & LED_STATE_CLAIMED) | |
| 134 | hw_led_state &= ~SEQUOIA_LED_BACK; | |
| 135 | break; | |
| 136 | ||
| 137 | default: | |
| 138 | break; | |
| 139 | } | |
| 140 | ||
| 141 | if (led_state & LED_STATE_ENABLED) | |
| 142 | sequoia_write(hw_led_state,0x09); | |
| 143 | ||
| 144 | spin_unlock_irqrestore(&leds_lock, flags); | |
| 145 | } | |
| 146 | ||
| 147 | static int __init leds_init(void) | |
| 148 | { | |
| 149 | extern void (*leds_event)(led_event_t); | |
| 150 | short temp; | |
| 151 | ||
| 152 | leds_event = sequoia_leds_event; | |
| 153 | ||
| 154 | /* Make LEDs independent of power-state */ | |
| 155 | request_region(0x24,4,"sequoia"); | |
| 156 | temp = sequoia_read(0x09); | |
| 157 | temp |= 1<<10; | |
| 158 | sequoia_write(temp,0x09); | |
| 159 | leds_event(led_start); | |
| 160 | return 0; | |
| 161 | } | |
| 162 | ||
| 163 | __initcall(leds_init); |