sound/aoa/core/snd-aoa-gpio-feature.c - maze/linux - Git at Google

 /*
  * Apple Onboard Audio feature call GPIO control
  *
  * Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
  *
  * GPL v2, can be found in COPYING.
  *
  * This file contains the GPIO control routines for
  * direct (through feature calls) access to the GPIO
  * registers.
  */

 #include <asm/pmac_feature.h>
 #include <linux/interrupt.h>
 #include "../aoa.h"

 /* TODO: these are 20 global variables
  * that aren't used on most machines...
  * Move them into a dynamically allocated
  * structure and use that.
  */

 /* these are the GPIO numbers (register addresses as offsets into
  * the GPIO space) */
 static int headphone_mute_gpio;
 static int amp_mute_gpio;
 static int lineout_mute_gpio;
 static int hw_reset_gpio;
 static int lineout_detect_gpio;
 static int headphone_detect_gpio;
 static int linein_detect_gpio;

 /* see the SWITCH_GPIO macro */
 static int headphone_mute_gpio_activestate;
 static int amp_mute_gpio_activestate;
 static int lineout_mute_gpio_activestate;
 static int hw_reset_gpio_activestate;
 static int lineout_detect_gpio_activestate;
 static int headphone_detect_gpio_activestate;
 static int linein_detect_gpio_activestate;

 /* node pointers that we save when getting the GPIO number
  * to get the interrupt later */
 static struct device_node *lineout_detect_node;
 static struct device_node *linein_detect_node;
 static struct device_node *headphone_detect_node;

 static int lineout_detect_irq;
 static int linein_detect_irq;
 static int headphone_detect_irq;

 static struct device_node *get_gpio(char *name,
 				    char *altname,
 				    int *gpioptr,
 				    int *gpioactiveptr)
 {
 	struct device_node *np, *gpio;
 	const u32 *reg;
 	const char *audio_gpio;

 	*gpioptr = -1;

 	/* check if we can get it the easy way ... */
 	np = of_find_node_by_name(NULL, name);
 	if (!np) {
 		/* some machines have only gpioX/extint-gpioX nodes,
 		 * and an audio-gpio property saying what it is ...
 		 * So what we have to do is enumerate all children
 		 * of the gpio node and check them all. */
 		gpio = of_find_node_by_name(NULL, "gpio");
 		if (!gpio)
 			return NULL;
 		while ((np = of_get_next_child(gpio, np))) {
 			audio_gpio = of_get_property(np, "audio-gpio", NULL);
 			if (!audio_gpio)
 				continue;
 			if (strcmp(audio_gpio, name) == 0)
 				break;
 			if (altname && (strcmp(audio_gpio, altname) == 0))
 				break;
 		}
 		/* still not found, assume not there */
 		if (!np)
 			return NULL;
 	}

 	reg = of_get_property(np, "reg", NULL);
 	if (!reg)
 		return NULL;

 	*gpioptr = *reg;

 	/* this is a hack, usually the GPIOs 'reg' property
 	 * should have the offset based from the GPIO space
 	 * which is at 0x50, but apparently not always... */
 	if (*gpioptr < 0x50)
 		*gpioptr += 0x50;

 	reg = of_get_property(np, "audio-gpio-active-state", NULL);
 	if (!reg)
 		/* Apple seems to default to 1, but
 		 * that doesn't seem right at least on most
 		 * machines. So until proven that the opposite
 		 * is necessary, we default to 0
 		 * (which, incidentally, snd-powermac also does...) */
 		*gpioactiveptr = 0;
 	else
 		*gpioactiveptr = *reg;

 	return np;
 }

 static void get_irq(struct device_node * np, int *irqptr)
 {
 	if (np)
 		*irqptr = irq_of_parse_and_map(np, 0);
 	else
 		*irqptr = NO_IRQ;
 }

 /* 0x4 is outenable, 0x1 is out, thus 4 or 5 */
 #define SWITCH_GPIO(name, v, on)				\
 	(((v)&~1) | ((on)?					\
 			(name##_gpio_activestate==0?4:5):	\
 			(name##_gpio_activestate==0?5:4)))

 #define FTR_GPIO(name, bit)					\
 static void ftr_gpio_set_##name(struct gpio_runtime *rt, int on)\
 {								\
 	int v;							\
 								\
 	if (unlikely(!rt)) return;				\
 								\
 	if (name##_mute_gpio < 0)				\
 		return;						\
 								\
 	v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,		\
 			      name##_mute_gpio,			\
 			      0);				\
 								\
 	/* muted = !on... */					\
 	v = SWITCH_GPIO(name##_mute, v, !on);			\
 								\
 	pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,		\
 			  name##_mute_gpio, v);			\
 								\
 	rt->implementation_private &= ~(1<<bit);		\
 	rt->implementation_private |= (!!on << bit);		\
 }								\
 static int ftr_gpio_get_##name(struct gpio_runtime *rt)		\
 {								\
 	if (unlikely(!rt)) return 0;				\
 	return (rt->implementation_private>>bit)&1;		\
 }

 FTR_GPIO(headphone, 0);
 FTR_GPIO(amp, 1);
 FTR_GPIO(lineout, 2);

 static void ftr_gpio_set_hw_reset(struct gpio_runtime *rt, int on)
 {
 	int v;

 	if (unlikely(!rt)) return;
 	if (hw_reset_gpio < 0)
 		return;

 	v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,
 			      hw_reset_gpio, 0);
 	v = SWITCH_GPIO(hw_reset, v, on);
 	pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,
 			  hw_reset_gpio, v);
 }

 static void ftr_gpio_all_amps_off(struct gpio_runtime *rt)
 {
 	int saved;

 	if (unlikely(!rt)) return;
 	saved = rt->implementation_private;
 	ftr_gpio_set_headphone(rt, 0);
 	ftr_gpio_set_amp(rt, 0);
 	ftr_gpio_set_lineout(rt, 0);
 	rt->implementation_private = saved;
 }

 static void ftr_gpio_all_amps_restore(struct gpio_runtime *rt)
 {
 	int s;

 	if (unlikely(!rt)) return;
 	s = rt->implementation_private;
 	ftr_gpio_set_headphone(rt, (s>>0)&1);
 	ftr_gpio_set_amp(rt, (s>>1)&1);
 	ftr_gpio_set_lineout(rt, (s>>2)&1);
 }

 static void ftr_handle_notify(struct work_struct *work)
 {
 	struct gpio_notification *notif =
 		container_of(work, struct gpio_notification, work.work);

 	mutex_lock(&notif->mutex);
 	if (notif->notify)
 		notif->notify(notif->data);
 	mutex_unlock(&notif->mutex);
 }

 static void gpio_enable_dual_edge(int gpio)
 {
 	int v;

 	if (gpio == -1)
 		return;
 	v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
 	v |= 0x80; /* enable dual edge */
 	pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, gpio, v);
 }

 static void ftr_gpio_init(struct gpio_runtime *rt)
 {
 	get_gpio("headphone-mute", NULL,
 		 &headphone_mute_gpio,
 		 &headphone_mute_gpio_activestate);
 	get_gpio("amp-mute", NULL,
 		 &amp_mute_gpio,
 		 &amp_mute_gpio_activestate);
 	get_gpio("lineout-mute", NULL,
 		 &lineout_mute_gpio,
 		 &lineout_mute_gpio_activestate);
 	get_gpio("hw-reset", "audio-hw-reset",
 		 &hw_reset_gpio,
 		 &hw_reset_gpio_activestate);

 	headphone_detect_node = get_gpio("headphone-detect", NULL,
 					 &headphone_detect_gpio,
 					 &headphone_detect_gpio_activestate);
 	/* go Apple, and thanks for giving these different names
 	 * across the board... */
 	lineout_detect_node = get_gpio("lineout-detect", "line-output-detect",
 				       &lineout_detect_gpio,
 				       &lineout_detect_gpio_activestate);
 	linein_detect_node = get_gpio("linein-detect", "line-input-detect",
 				      &linein_detect_gpio,
 				      &linein_detect_gpio_activestate);

 	gpio_enable_dual_edge(headphone_detect_gpio);
 	gpio_enable_dual_edge(lineout_detect_gpio);
 	gpio_enable_dual_edge(linein_detect_gpio);

 	get_irq(headphone_detect_node, &headphone_detect_irq);
 	get_irq(lineout_detect_node, &lineout_detect_irq);
 	get_irq(linein_detect_node, &linein_detect_irq);

 	ftr_gpio_all_amps_off(rt);
 	rt->implementation_private = 0;
 	INIT_DELAYED_WORK(&rt->headphone_notify.work, ftr_handle_notify);
 	INIT_DELAYED_WORK(&rt->line_in_notify.work, ftr_handle_notify);
 	INIT_DELAYED_WORK(&rt->line_out_notify.work, ftr_handle_notify);
 	mutex_init(&rt->headphone_notify.mutex);
 	mutex_init(&rt->line_in_notify.mutex);
 	mutex_init(&rt->line_out_notify.mutex);
 }

 static void ftr_gpio_exit(struct gpio_runtime *rt)
 {
 	ftr_gpio_all_amps_off(rt);
 	rt->implementation_private = 0;
 	if (rt->headphone_notify.notify)
 		free_irq(headphone_detect_irq, &rt->headphone_notify);
 	if (rt->line_in_notify.gpio_private)
 		free_irq(linein_detect_irq, &rt->line_in_notify);
 	if (rt->line_out_notify.gpio_private)
 		free_irq(lineout_detect_irq, &rt->line_out_notify);
 	cancel_delayed_work(&rt->headphone_notify.work);
 	cancel_delayed_work(&rt->line_in_notify.work);
 	cancel_delayed_work(&rt->line_out_notify.work);
 	flush_scheduled_work();
 	mutex_destroy(&rt->headphone_notify.mutex);
 	mutex_destroy(&rt->line_in_notify.mutex);
 	mutex_destroy(&rt->line_out_notify.mutex);
 }

 static irqreturn_t ftr_handle_notify_irq(int xx, void *data)
 {
 	struct gpio_notification *notif = data;

 	schedule_delayed_work(&notif->work, 0);

 	return IRQ_HANDLED;
 }

 static int ftr_set_notify(struct gpio_runtime *rt,
 			  enum notify_type type,
 			  notify_func_t notify,
 			  void *data)
 {
 	struct gpio_notification *notif;
 	notify_func_t old;
 	int irq;
 	char *name;
 	int err = -EBUSY;

 	switch (type) {
 	case AOA_NOTIFY_HEADPHONE:
 		notif = &rt->headphone_notify;
 		name = "headphone-detect";
 		irq = headphone_detect_irq;
 		break;
 	case AOA_NOTIFY_LINE_IN:
 		notif = &rt->line_in_notify;
 		name = "linein-detect";
 		irq = linein_detect_irq;
 		break;
 	case AOA_NOTIFY_LINE_OUT:
 		notif = &rt->line_out_notify;
 		name = "lineout-detect";
 		irq = lineout_detect_irq;
 		break;
 	default:
 		return -EINVAL;
 	}

 	if (irq == NO_IRQ)
 		return -ENODEV;

 	mutex_lock(&notif->mutex);

 	old = notif->notify;

 	if (!old && !notify) {
 		err = 0;
 		goto out_unlock;
 	}

 	if (old && notify) {
 		if (old == notify && notif->data == data)
 			err = 0;
 		goto out_unlock;
 	}

 	if (old && !notify)
 		free_irq(irq, notif);

 	if (!old && notify) {
 		err = request_irq(irq, ftr_handle_notify_irq, 0, name, notif);
 		if (err)
 			goto out_unlock;
 	}

 	notif->notify = notify;
 	notif->data = data;

 	err = 0;
  out_unlock:
 	mutex_unlock(&notif->mutex);
 	return err;
 }

 static int ftr_get_detect(struct gpio_runtime *rt,
 			  enum notify_type type)
 {
 	int gpio, ret, active;

 	switch (type) {
 	case AOA_NOTIFY_HEADPHONE:
 		gpio = headphone_detect_gpio;
 		active = headphone_detect_gpio_activestate;
 		break;
 	case AOA_NOTIFY_LINE_IN:
 		gpio = linein_detect_gpio;
 		active = linein_detect_gpio_activestate;
 		break;
 	case AOA_NOTIFY_LINE_OUT:
 		gpio = lineout_detect_gpio;
 		active = lineout_detect_gpio_activestate;
 		break;
 	default:
 		return -EINVAL;
 	}

 	if (gpio == -1)
 		return -ENODEV;

 	ret = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
 	if (ret < 0)
 		return ret;
 	return ((ret >> 1) & 1) == active;
 }

 static struct gpio_methods methods = {
 	.init			= ftr_gpio_init,
 	.exit			= ftr_gpio_exit,
 	.all_amps_off		= ftr_gpio_all_amps_off,
 	.all_amps_restore	= ftr_gpio_all_amps_restore,
 	.set_headphone		= ftr_gpio_set_headphone,
 	.set_speakers		= ftr_gpio_set_amp,
 	.set_lineout		= ftr_gpio_set_lineout,
 	.set_hw_reset		= ftr_gpio_set_hw_reset,
 	.get_headphone		= ftr_gpio_get_headphone,
 	.get_speakers		= ftr_gpio_get_amp,
 	.get_lineout		= ftr_gpio_get_lineout,
 	.set_notify		= ftr_set_notify,
 	.get_detect		= ftr_get_detect,
 };

 struct gpio_methods *ftr_gpio_methods = &methods;
 EXPORT_SYMBOL_GPL(ftr_gpio_methods);
	/*
	* Apple Onboard Audio feature call GPIO control
	*
	* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
	*
	* GPL v2, can be found in COPYING.
	*
	* This file contains the GPIO control routines for
	* direct (through feature calls) access to the GPIO
	* registers.
	*/

	#include <asm/pmac_feature.h>
	#include <linux/interrupt.h>
	#include "../aoa.h"

	/* TODO: these are 20 global variables
	* that aren't used on most machines...
	* Move them into a dynamically allocated
	* structure and use that.
	*/

	/* these are the GPIO numbers (register addresses as offsets into
	* the GPIO space) */
	static int headphone_mute_gpio;
	static int amp_mute_gpio;
	static int lineout_mute_gpio;
	static int hw_reset_gpio;
	static int lineout_detect_gpio;
	static int headphone_detect_gpio;
	static int linein_detect_gpio;

	/* see the SWITCH_GPIO macro */
	static int headphone_mute_gpio_activestate;
	static int amp_mute_gpio_activestate;
	static int lineout_mute_gpio_activestate;
	static int hw_reset_gpio_activestate;
	static int lineout_detect_gpio_activestate;
	static int headphone_detect_gpio_activestate;
	static int linein_detect_gpio_activestate;

	/* node pointers that we save when getting the GPIO number
	* to get the interrupt later */
	static struct device_node *lineout_detect_node;
	static struct device_node *linein_detect_node;
	static struct device_node *headphone_detect_node;

	static int lineout_detect_irq;
	static int linein_detect_irq;
	static int headphone_detect_irq;

	static struct device_node get_gpio(char name,
	char *altname,
	int *gpioptr,
	int *gpioactiveptr)
	{
	struct device_node np, gpio;
	const u32 *reg;
	const char *audio_gpio;

	*gpioptr = -1;

	/* check if we can get it the easy way ... */
	np = of_find_node_by_name(NULL, name);
	if (!np) {
	/* some machines have only gpioX/extint-gpioX nodes,
	* and an audio-gpio property saying what it is ...
	* So what we have to do is enumerate all children
	* of the gpio node and check them all. */
	gpio = of_find_node_by_name(NULL, "gpio");
	if (!gpio)
	return NULL;
	while ((np = of_get_next_child(gpio, np))) {
	audio_gpio = of_get_property(np, "audio-gpio", NULL);
	if (!audio_gpio)
	continue;
	if (strcmp(audio_gpio, name) == 0)
	break;
	if (altname && (strcmp(audio_gpio, altname) == 0))
	break;
	}
	/* still not found, assume not there */
	if (!np)
	return NULL;
	}

	reg = of_get_property(np, "reg", NULL);
	if (!reg)
	return NULL;

	gpioptr = reg;

	/* this is a hack, usually the GPIOs 'reg' property
	* should have the offset based from the GPIO space
	* which is at 0x50, but apparently not always... */
	if (*gpioptr < 0x50)
	*gpioptr += 0x50;

	reg = of_get_property(np, "audio-gpio-active-state", NULL);
	if (!reg)
	/* Apple seems to default to 1, but
	* that doesn't seem right at least on most
	* machines. So until proven that the opposite
	* is necessary, we default to 0
	* (which, incidentally, snd-powermac also does...) */
	*gpioactiveptr = 0;
	else
	gpioactiveptr = reg;

	return np;
	}

	static void get_irq(struct device_node * np, int *irqptr)
	{
	if (np)
	*irqptr = irq_of_parse_and_map(np, 0);
	else
	*irqptr = NO_IRQ;
	}

	/* 0x4 is outenable, 0x1 is out, thus 4 or 5 */
	#define SWITCH_GPIO(name, v, on) \
	(((v)&~1) \| ((on)? \
	(name##_gpio_activestate==0?4:5): \
	(name##_gpio_activestate==0?5:4)))

	#define FTR_GPIO(name, bit) \
	static void ftr_gpio_set_##name(struct gpio_runtime *rt, int on)\
	{ \
	int v; \
	\
	if (unlikely(!rt)) return; \
	\
	if (name##_mute_gpio < 0) \
	return; \
	\
	v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, \
	name##_mute_gpio, \
	0); \
	\
	/* muted = !on... */ \
	v = SWITCH_GPIO(name##_mute, v, !on); \
	\
	pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, \
	name##_mute_gpio, v); \
	\
	rt->implementation_private &= ~(1<<bit); \
	rt->implementation_private \|= (!!on << bit); \
	} \
	static int ftr_gpio_get_##name(struct gpio_runtime *rt) \
	{ \
	if (unlikely(!rt)) return 0; \
	return (rt->implementation_private>>bit)&1; \
	}

	FTR_GPIO(headphone, 0);
	FTR_GPIO(amp, 1);
	FTR_GPIO(lineout, 2);

	static void ftr_gpio_set_hw_reset(struct gpio_runtime *rt, int on)
	{
	int v;

	if (unlikely(!rt)) return;
	if (hw_reset_gpio < 0)
	return;

	v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,
	hw_reset_gpio, 0);
	v = SWITCH_GPIO(hw_reset, v, on);
	pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,
	hw_reset_gpio, v);
	}

	static void ftr_gpio_all_amps_off(struct gpio_runtime *rt)
	{
	int saved;

	if (unlikely(!rt)) return;
	saved = rt->implementation_private;
	ftr_gpio_set_headphone(rt, 0);
	ftr_gpio_set_amp(rt, 0);
	ftr_gpio_set_lineout(rt, 0);
	rt->implementation_private = saved;
	}

	static void ftr_gpio_all_amps_restore(struct gpio_runtime *rt)
	{
	int s;

	if (unlikely(!rt)) return;
	s = rt->implementation_private;
	ftr_gpio_set_headphone(rt, (s>>0)&1);
	ftr_gpio_set_amp(rt, (s>>1)&1);
	ftr_gpio_set_lineout(rt, (s>>2)&1);
	}

	static void ftr_handle_notify(struct work_struct *work)
	{
	struct gpio_notification *notif =
	container_of(work, struct gpio_notification, work.work);

	mutex_lock(&notif->mutex);
	if (notif->notify)
	notif->notify(notif->data);
	mutex_unlock(&notif->mutex);
	}

	static void gpio_enable_dual_edge(int gpio)
	{
	int v;

	if (gpio == -1)
	return;
	v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
	v \|= 0x80; /* enable dual edge */
	pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, gpio, v);
	}

	static void ftr_gpio_init(struct gpio_runtime *rt)
	{
	get_gpio("headphone-mute", NULL,
	&headphone_mute_gpio,
	&headphone_mute_gpio_activestate);
	get_gpio("amp-mute", NULL,
	&amp_mute_gpio,
	&amp_mute_gpio_activestate);
	get_gpio("lineout-mute", NULL,
	&lineout_mute_gpio,
	&lineout_mute_gpio_activestate);
	get_gpio("hw-reset", "audio-hw-reset",
	&hw_reset_gpio,
	&hw_reset_gpio_activestate);

	headphone_detect_node = get_gpio("headphone-detect", NULL,
	&headphone_detect_gpio,
	&headphone_detect_gpio_activestate);
	/* go Apple, and thanks for giving these different names
	* across the board... */
	lineout_detect_node = get_gpio("lineout-detect", "line-output-detect",
	&lineout_detect_gpio,
	&lineout_detect_gpio_activestate);
	linein_detect_node = get_gpio("linein-detect", "line-input-detect",
	&linein_detect_gpio,
	&linein_detect_gpio_activestate);

	gpio_enable_dual_edge(headphone_detect_gpio);
	gpio_enable_dual_edge(lineout_detect_gpio);
	gpio_enable_dual_edge(linein_detect_gpio);

	get_irq(headphone_detect_node, &headphone_detect_irq);
	get_irq(lineout_detect_node, &lineout_detect_irq);
	get_irq(linein_detect_node, &linein_detect_irq);

	ftr_gpio_all_amps_off(rt);
	rt->implementation_private = 0;
	INIT_DELAYED_WORK(&rt->headphone_notify.work, ftr_handle_notify);
	INIT_DELAYED_WORK(&rt->line_in_notify.work, ftr_handle_notify);
	INIT_DELAYED_WORK(&rt->line_out_notify.work, ftr_handle_notify);
	mutex_init(&rt->headphone_notify.mutex);
	mutex_init(&rt->line_in_notify.mutex);
	mutex_init(&rt->line_out_notify.mutex);
	}

	static void ftr_gpio_exit(struct gpio_runtime *rt)
	{
	ftr_gpio_all_amps_off(rt);
	rt->implementation_private = 0;
	if (rt->headphone_notify.notify)
	free_irq(headphone_detect_irq, &rt->headphone_notify);
	if (rt->line_in_notify.gpio_private)
	free_irq(linein_detect_irq, &rt->line_in_notify);
	if (rt->line_out_notify.gpio_private)
	free_irq(lineout_detect_irq, &rt->line_out_notify);
	cancel_delayed_work(&rt->headphone_notify.work);
	cancel_delayed_work(&rt->line_in_notify.work);
	cancel_delayed_work(&rt->line_out_notify.work);
	flush_scheduled_work();
	mutex_destroy(&rt->headphone_notify.mutex);
	mutex_destroy(&rt->line_in_notify.mutex);
	mutex_destroy(&rt->line_out_notify.mutex);
	}

	static irqreturn_t ftr_handle_notify_irq(int xx, void *data)
	{
	struct gpio_notification *notif = data;

	schedule_delayed_work(&notif->work, 0);

	return IRQ_HANDLED;
	}

	static int ftr_set_notify(struct gpio_runtime *rt,
	enum notify_type type,
	notify_func_t notify,
	void *data)
	{
	struct gpio_notification *notif;
	notify_func_t old;
	int irq;
	char *name;
	int err = -EBUSY;

	switch (type) {
	case AOA_NOTIFY_HEADPHONE:
	notif = &rt->headphone_notify;
	name = "headphone-detect";
	irq = headphone_detect_irq;
	break;
	case AOA_NOTIFY_LINE_IN:
	notif = &rt->line_in_notify;
	name = "linein-detect";
	irq = linein_detect_irq;
	break;
	case AOA_NOTIFY_LINE_OUT:
	notif = &rt->line_out_notify;
	name = "lineout-detect";
	irq = lineout_detect_irq;
	break;
	default:
	return -EINVAL;
	}

	if (irq == NO_IRQ)
	return -ENODEV;

	mutex_lock(&notif->mutex);

	old = notif->notify;

	if (!old && !notify) {
	err = 0;
	goto out_unlock;
	}

	if (old && notify) {
	if (old == notify && notif->data == data)
	err = 0;
	goto out_unlock;
	}

	if (old && !notify)
	free_irq(irq, notif);

	if (!old && notify) {
	err = request_irq(irq, ftr_handle_notify_irq, 0, name, notif);
	if (err)
	goto out_unlock;
	}

	notif->notify = notify;
	notif->data = data;

	err = 0;
	out_unlock:
	mutex_unlock(&notif->mutex);
	return err;
	}

	static int ftr_get_detect(struct gpio_runtime *rt,
	enum notify_type type)
	{
	int gpio, ret, active;

	switch (type) {
	case AOA_NOTIFY_HEADPHONE:
	gpio = headphone_detect_gpio;
	active = headphone_detect_gpio_activestate;
	break;
	case AOA_NOTIFY_LINE_IN:
	gpio = linein_detect_gpio;
	active = linein_detect_gpio_activestate;
	break;
	case AOA_NOTIFY_LINE_OUT:
	gpio = lineout_detect_gpio;
	active = lineout_detect_gpio_activestate;
	break;
	default:
	return -EINVAL;
	}

	if (gpio == -1)
	return -ENODEV;

	ret = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
	if (ret < 0)
	return ret;
	return ((ret >> 1) & 1) == active;
	}

	static struct gpio_methods methods = {
	.init = ftr_gpio_init,
	.exit = ftr_gpio_exit,
	.all_amps_off = ftr_gpio_all_amps_off,
	.all_amps_restore = ftr_gpio_all_amps_restore,
	.set_headphone = ftr_gpio_set_headphone,
	.set_speakers = ftr_gpio_set_amp,
	.set_lineout = ftr_gpio_set_lineout,
	.set_hw_reset = ftr_gpio_set_hw_reset,
	.get_headphone = ftr_gpio_get_headphone,
	.get_speakers = ftr_gpio_get_amp,
	.get_lineout = ftr_gpio_get_lineout,
	.set_notify = ftr_set_notify,
	.get_detect = ftr_get_detect,
	};

	struct gpio_methods *ftr_gpio_methods = &methods;
	EXPORT_SYMBOL_GPL(ftr_gpio_methods);