[deliverable/linux.git] / arch / arm / mach-shark / leds.c

/*
 * DIGITAL Shark LED control routines.
 *
 * Driver for the 3 user LEDs found on the Shark
 * Based on Versatile and RealView machine LED code
 *
 * License terms: GNU General Public License (GPL) version 2
 * Author: Bryan Wu <bryan.wu@canonical.com>
 */
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/slab.h>
#include <linux/leds.h>

#include <asm/mach-types.h>

#if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS)
struct shark_led {
	struct led_classdev cdev;
	u8 mask;
};

/*
 * 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 */
};

static u16 led_reg_read(void)
{
	outw(0x09, 0x24);
	return inw(0x26);
}

static void led_reg_write(u16 value)
{
	outw(0x09, 0x24);
	outw(value, 0x26);
}

static void shark_led_set(struct led_classdev *cdev,
			      enum led_brightness b)
{
	struct shark_led *led = container_of(cdev,
						 struct shark_led, cdev);
	u16 reg = led_reg_read();

	if (b != LED_OFF)
		reg |= led->mask;
	else
		reg &= ~led->mask;

	led_reg_write(reg);
}

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();

	return (reg & led->mask) ? LED_FULL : LED_OFF;
}

static int __init shark_leds_init(void)
{
	int i;
	u16 reg;

	if (!machine_is_shark())
		return -ENODEV;

	for (i = 0; i < ARRAY_SIZE(shark_leds); i++) {
		struct shark_led *led;

		led = kzalloc(sizeof(*led), GFP_KERNEL);
		if (!led)
			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;

		/* Count in 5 bits offset */
		led->mask = BIT(i + 5);

		if (led_classdev_register(NULL, &led->cdev) < 0) {
			kfree(led);
			break;
		}
	}

	/* Make LEDs independent of power-state */
	request_region(0x24, 4, "led_reg");
	reg = led_reg_read();
	reg |= 1 << 10;
	led_reg_write(reg);

	return 0;
}

/*
 * Since we may have triggers on any subsystem, defer registration
 * until after subsystem_init.
 */
fs_initcall(shark_leds_init);
#endif
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* DIGITAL Shark LED control routines.
1da177e4 LT	3	*
408a4b2e BW	4	* Driver for the 3 user LEDs found on the Shark
408a4b2e BW	5	* Based on Versatile and RealView machine LED code
1da177e4	6	*
408a4b2e BW	7	* License terms: GNU General Public License (GPL) version 2
408a4b2e BW	8	* Author: Bryan Wu <bryan.wu@canonical.com>
1da177e4	9	*/
1da177e4	10	#include <linux/kernel.h>
1da177e4	11	#include <linux/init.h>
fced80c7	12	#include <linux/io.h>
408a4b2e BW	13	#include <linux/ioport.h>
	14	#include <linux/slab.h>
	15	#include <linux/leds.h>
1da177e4	16
408a4b2e	17	#include <asm/mach-types.h>
1da177e4	18
408a4b2e BW	19	#if defined(CONFIG_NEW_LEDS) && defined(CONFIG_LEDS_CLASS)
	20	struct shark_led {
	21	struct led_classdev cdev;
	22	u8 mask;
	23	};
eab184c2	24
408a4b2e BW	25	/*
	26	* The triggers lines up below will only be used if the
	27	* LED triggers are compiled in.
	28	*/
	29	static const struct {
	30	const char *name;
	31	const char *trigger;
	32	} shark_leds[] = {
	33	{ "shark:amber0", "default-on", }, /* Bit 5 */
	34	{ "shark:green", "heartbeat", }, /* Bit 6 */
	35	{ "shark:amber1", "cpu0" }, /* Bit 7 */
	36	};
	37
	38	static u16 led_reg_read(void)
	39	{
	40	outw(0x09, 0x24);
	41	return inw(0x26);
	42	}
eab184c2	43
408a4b2e BW	44	static void led_reg_write(u16 value)
	45	{
	46	outw(0x09, 0x24);
	47	outw(value, 0x26);
	48	}
1da177e4	49
408a4b2e BW	50	static void shark_led_set(struct led_classdev *cdev,
	51	enum led_brightness b)
	52	{
	53	struct shark_led *led = container_of(cdev,
	54	struct shark_led, cdev);
	55	u16 reg = led_reg_read();
1da177e4	56
408a4b2e BW	57	if (b != LED_OFF)
	58	reg \|= led->mask;
	59	else
	60	reg &= ~led->mask;
1da177e4	61
408a4b2e	62	led_reg_write(reg);
1da177e4 LT	63	}
1da177e4 LT	64
408a4b2e	65	static enum led_brightness shark_led_get(struct led_classdev *cdev)
1da177e4	66	{
408a4b2e BW	67	struct shark_led *led = container_of(cdev,
	68	struct shark_led, cdev);
	69	u16 reg = led_reg_read();
1da177e4	70
408a4b2e BW	71	return (reg & led->mask) ? LED_FULL : LED_OFF;
408a4b2e BW	72	}
1da177e4	73
408a4b2e BW	74	static int __init shark_leds_init(void)
	75	{
	76	int i;
	77	u16 reg;
1da177e4	78
408a4b2e BW	79	if (!machine_is_shark())
408a4b2e BW	80	return -ENODEV;
1da177e4	81
408a4b2e BW	82	for (i = 0; i < ARRAY_SIZE(shark_leds); i++) {
408a4b2e BW	83	struct shark_led *led;
1da177e4	84
408a4b2e BW	85	led = kzalloc(sizeof(*led), GFP_KERNEL);
	86	if (!led)
	87	break;
1da177e4	88
408a4b2e BW	89	led->cdev.name = shark_leds[i].name;
	90	led->cdev.brightness_set = shark_led_set;
	91	led->cdev.brightness_get = shark_led_get;
	92	led->cdev.default_trigger = shark_leds[i].trigger;
1da177e4	93
408a4b2e BW	94	/* Count in 5 bits offset */
408a4b2e BW	95	led->mask = BIT(i + 5);
1da177e4	96
408a4b2e BW	97	if (led_classdev_register(NULL, &led->cdev) < 0) {
	98	kfree(led);
	99	break;
	100	}
	101	}
1da177e4 LT	102
1da177e4 LT	103	/* Make LEDs independent of power-state */
408a4b2e BW	104	request_region(0x24, 4, "led_reg");
	105	reg = led_reg_read();
	106	reg \|= 1 << 10;
	107	led_reg_write(reg);
	108
1da177e4 LT	109	return 0;
	110	}
	111
408a4b2e BW	112	/*
	113	* Since we may have triggers on any subsystem, defer registration
	114	* until after subsystem_init.
	115	*/
	116	fs_initcall(shark_leds_init);
	117	#endif