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DEFINITIONS
This source file includes following definitions.
- get_gpio
- get_irq
- ftr_gpio_set_hw_reset
- ftr_gpio_all_amps_off
- ftr_gpio_all_amps_restore
- ftr_handle_notify
- gpio_enable_dual_edge
- ftr_gpio_init
- ftr_gpio_exit
- ftr_handle_notify_irq
- ftr_set_notify
- ftr_get_detect
/*
* 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(¬if->mutex);
if (notif->notify)
notif->notify(notif->data);
mutex_unlock(¬if->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,
&_mute_gpio,
&_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(¬if->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(¬if->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(¬if->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);