diff options
Diffstat (limited to 'arch/arm/mach-shark/leds.c')
| -rw-r--r-- | arch/arm/mach-shark/leds.c | 214 |
1 files changed, 83 insertions, 131 deletions
diff --git a/arch/arm/mach-shark/leds.c b/arch/arm/mach-shark/leds.c index 25609076921..081c778a10a 100644 --- a/arch/arm/mach-shark/leds.c +++ b/arch/arm/mach-shark/leds.c @@ -1,165 +1,117 @@ /* - * arch/arm/mach-shark/leds.c - * by Alexander Schulz - * - * derived from: - * arch/arm/kernel/leds-footbridge.c - * Copyright (C) 1998-1999 Russell King - * * DIGITAL Shark LED control routines. * - * The leds use is as follows: - * - Green front - toggles state every 50 timer interrupts - * - Amber front - Unused, this is a dual color led (Amber/Green) - * - Amber back - On if system is not idle + * Driver for the 3 user LEDs found on the Shark + * Based on Versatile and RealView machine LED code * - * Changelog: + * License terms: GNU General Public License (GPL) version 2 + * Author: Bryan Wu <bryan.wu@canonical.com> */ #include <linux/kernel.h> -#include <linux/module.h> #include <linux/init.h> -#include <linux/spinlock.h> -#include <linux/ioport.h> #include <linux/io.h> +#include <linux/ioport.h> +#include <linux/slab.h> +#include <linux/leds.h> -#include <asm/leds.h> - -#define LED_STATE_ENABLED 1 -#define LED_STATE_CLAIMED 2 - -#define SEQUOIA_LED_GREEN (1<<6) -#define SEQUOIA_LED_AMBER (1<<5) -#define SEQUOIA_LED_BACK (1<<7) +#include <asm/mach-types.h> -static char led_state; -static short hw_led_state; -static short saved_state; +#if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS) +struct shark_led { + struct led_classdev cdev; + u8 mask; +}; -static DEFINE_RAW_SPINLOCK(leds_lock); +/* + * The triggers lines up below will only be used if the + * LED triggers are compiled in. + */ +static const struct { + const char *name; + const char *trigger; +} shark_leds[] = { + { "shark:amber0", "default-on", }, /* Bit 5 */ + { "shark:green", "heartbeat", }, /* Bit 6 */ + { "shark:amber1", "cpu0" }, /* Bit 7 */ +}; -short sequoia_read(int addr) { - outw(addr,0x24); - return inw(0x26); +static u16 led_reg_read(void) +{ + outw(0x09, 0x24); + return inw(0x26); } -void sequoia_write(short value,short addr) { - outw(addr,0x24); - outw(value,0x26); +static void led_reg_write(u16 value) +{ + outw(0x09, 0x24); + outw(value, 0x26); } -static void sequoia_leds_event(led_event_t evt) +static void shark_led_set(struct led_classdev *cdev, + enum led_brightness b) { - unsigned long flags; - - raw_spin_lock_irqsave(&leds_lock, flags); - - hw_led_state = sequoia_read(0x09); - - switch (evt) { - case led_start: - hw_led_state |= SEQUOIA_LED_GREEN; - hw_led_state |= SEQUOIA_LED_AMBER; -#ifdef CONFIG_LEDS_CPU - hw_led_state |= SEQUOIA_LED_BACK; -#else - hw_led_state &= ~SEQUOIA_LED_BACK; -#endif - led_state |= LED_STATE_ENABLED; - break; - - case led_stop: - hw_led_state &= ~SEQUOIA_LED_BACK; - hw_led_state |= SEQUOIA_LED_GREEN; - hw_led_state |= SEQUOIA_LED_AMBER; - led_state &= ~LED_STATE_ENABLED; - break; - - case led_claim: - led_state |= LED_STATE_CLAIMED; - saved_state = hw_led_state; - hw_led_state &= ~SEQUOIA_LED_BACK; - hw_led_state |= SEQUOIA_LED_GREEN; - hw_led_state |= SEQUOIA_LED_AMBER; - break; + struct shark_led *led = container_of(cdev, + struct shark_led, cdev); + u16 reg = led_reg_read(); - case led_release: - led_state &= ~LED_STATE_CLAIMED; - hw_led_state = saved_state; - break; + if (b != LED_OFF) + reg |= led->mask; + else + reg &= ~led->mask; -#ifdef CONFIG_LEDS_TIMER - case led_timer: - if (!(led_state & LED_STATE_CLAIMED)) - hw_led_state ^= SEQUOIA_LED_GREEN; - break; -#endif + led_reg_write(reg); +} -#ifdef CONFIG_LEDS_CPU - case led_idle_start: - if (!(led_state & LED_STATE_CLAIMED)) - hw_led_state &= ~SEQUOIA_LED_BACK; - break; +static enum led_brightness shark_led_get(struct led_classdev *cdev) +{ + struct shark_led *led = container_of(cdev, + struct shark_led, cdev); + u16 reg = led_reg_read(); - case led_idle_end: - if (!(led_state & LED_STATE_CLAIMED)) - hw_led_state |= SEQUOIA_LED_BACK; - break; -#endif + return (reg & led->mask) ? LED_FULL : LED_OFF; +} - case led_green_on: - if (led_state & LED_STATE_CLAIMED) - hw_led_state &= ~SEQUOIA_LED_GREEN; - break; +static int __init shark_leds_init(void) +{ + int i; + u16 reg; - case led_green_off: - if (led_state & LED_STATE_CLAIMED) - hw_led_state |= SEQUOIA_LED_GREEN; - break; + if (!machine_is_shark()) + return -ENODEV; - case led_amber_on: - if (led_state & LED_STATE_CLAIMED) - hw_led_state &= ~SEQUOIA_LED_AMBER; - break; + for (i = 0; i < ARRAY_SIZE(shark_leds); i++) { + struct shark_led *led; - case led_amber_off: - if (led_state & LED_STATE_CLAIMED) - hw_led_state |= SEQUOIA_LED_AMBER; - break; + led = kzalloc(sizeof(*led), GFP_KERNEL); + if (!led) + break; - case led_red_on: - if (led_state & LED_STATE_CLAIMED) - hw_led_state |= SEQUOIA_LED_BACK; - break; + led->cdev.name = shark_leds[i].name; + led->cdev.brightness_set = shark_led_set; + led->cdev.brightness_get = shark_led_get; + led->cdev.default_trigger = shark_leds[i].trigger; - case led_red_off: - if (led_state & LED_STATE_CLAIMED) - hw_led_state &= ~SEQUOIA_LED_BACK; - break; + /* Count in 5 bits offset */ + led->mask = BIT(i + 5); - default: - break; + if (led_classdev_register(NULL, &led->cdev) < 0) { + kfree(led); + break; + } } - if (led_state & LED_STATE_ENABLED) - sequoia_write(hw_led_state,0x09); - - raw_spin_unlock_irqrestore(&leds_lock, flags); -} - -static int __init leds_init(void) -{ - extern void (*leds_event)(led_event_t); - short temp; - - leds_event = sequoia_leds_event; - /* Make LEDs independent of power-state */ - request_region(0x24,4,"sequoia"); - temp = sequoia_read(0x09); - temp |= 1<<10; - sequoia_write(temp,0x09); - leds_event(led_start); + request_region(0x24, 4, "led_reg"); + reg = led_reg_read(); + reg |= 1 << 10; + led_reg_write(reg); + return 0; } -__initcall(leds_init); +/* + * Since we may have triggers on any subsystem, defer registration + * until after subsystem_init. + */ +fs_initcall(shark_leds_init); +#endif |