412 lines
10 KiB
C
412 lines
10 KiB
C
/*
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* Apple Onboard Audio feature call GPIO control
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*
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* Copyright 2006 Johannes Berg <johannes@sipsolutions.net>
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*
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* GPL v2, can be found in COPYING.
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*
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* This file contains the GPIO control routines for
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* direct (through feature calls) access to the GPIO
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* registers.
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*/
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#include <asm/pmac_feature.h>
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#include <linux/interrupt.h>
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#include "../aoa.h"
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/* TODO: these are 20 global variables
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* that aren't used on most machines...
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* Move them into a dynamically allocated
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* structure and use that.
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*/
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/* these are the GPIO numbers (register addresses as offsets into
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* the GPIO space) */
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static int headphone_mute_gpio;
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static int amp_mute_gpio;
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static int lineout_mute_gpio;
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static int hw_reset_gpio;
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static int lineout_detect_gpio;
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static int headphone_detect_gpio;
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static int linein_detect_gpio;
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/* see the SWITCH_GPIO macro */
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static int headphone_mute_gpio_activestate;
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static int amp_mute_gpio_activestate;
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static int lineout_mute_gpio_activestate;
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static int hw_reset_gpio_activestate;
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static int lineout_detect_gpio_activestate;
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static int headphone_detect_gpio_activestate;
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static int linein_detect_gpio_activestate;
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/* node pointers that we save when getting the GPIO number
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* to get the interrupt later */
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static struct device_node *lineout_detect_node;
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static struct device_node *linein_detect_node;
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static struct device_node *headphone_detect_node;
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static int lineout_detect_irq;
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static int linein_detect_irq;
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static int headphone_detect_irq;
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static struct device_node *get_gpio(char *name,
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char *altname,
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int *gpioptr,
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int *gpioactiveptr)
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{
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struct device_node *np, *gpio;
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u32 *reg;
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const char *audio_gpio;
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*gpioptr = -1;
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/* check if we can get it the easy way ... */
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np = of_find_node_by_name(NULL, name);
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if (!np) {
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/* some machines have only gpioX/extint-gpioX nodes,
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* and an audio-gpio property saying what it is ...
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* So what we have to do is enumerate all children
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* of the gpio node and check them all. */
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gpio = of_find_node_by_name(NULL, "gpio");
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if (!gpio)
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return NULL;
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while ((np = of_get_next_child(gpio, np))) {
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audio_gpio = get_property(np, "audio-gpio", NULL);
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if (!audio_gpio)
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continue;
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if (strcmp(audio_gpio, name) == 0)
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break;
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if (altname && (strcmp(audio_gpio, altname) == 0))
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break;
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}
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/* still not found, assume not there */
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if (!np)
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return NULL;
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}
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reg = (u32 *)get_property(np, "reg", NULL);
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if (!reg)
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return NULL;
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*gpioptr = *reg;
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/* this is a hack, usually the GPIOs 'reg' property
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* should have the offset based from the GPIO space
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* which is at 0x50, but apparently not always... */
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if (*gpioptr < 0x50)
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*gpioptr += 0x50;
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reg = (u32 *)get_property(np, "audio-gpio-active-state", NULL);
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if (!reg)
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/* Apple seems to default to 1, but
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* that doesn't seem right at least on most
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* machines. So until proven that the opposite
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* is necessary, we default to 0
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* (which, incidentally, snd-powermac also does...) */
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*gpioactiveptr = 0;
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else
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*gpioactiveptr = *reg;
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return np;
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}
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static void get_irq(struct device_node * np, int *irqptr)
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{
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if (np)
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*irqptr = irq_of_parse_and_map(np, 0);
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else
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*irqptr = NO_IRQ;
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}
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/* 0x4 is outenable, 0x1 is out, thus 4 or 5 */
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#define SWITCH_GPIO(name, v, on) \
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(((v)&~1) | ((on)? \
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(name##_gpio_activestate==0?4:5): \
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(name##_gpio_activestate==0?5:4)))
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#define FTR_GPIO(name, bit) \
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static void ftr_gpio_set_##name(struct gpio_runtime *rt, int on)\
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{ \
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int v; \
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\
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if (unlikely(!rt)) return; \
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\
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if (name##_mute_gpio < 0) \
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return; \
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\
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v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, \
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name##_mute_gpio, \
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0); \
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\
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/* muted = !on... */ \
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v = SWITCH_GPIO(name##_mute, v, !on); \
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\
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pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, \
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name##_mute_gpio, v); \
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\
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rt->implementation_private &= ~(1<<bit); \
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rt->implementation_private |= (!!on << bit); \
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} \
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static int ftr_gpio_get_##name(struct gpio_runtime *rt) \
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{ \
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if (unlikely(!rt)) return 0; \
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return (rt->implementation_private>>bit)&1; \
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}
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FTR_GPIO(headphone, 0);
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FTR_GPIO(amp, 1);
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FTR_GPIO(lineout, 2);
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static void ftr_gpio_set_hw_reset(struct gpio_runtime *rt, int on)
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{
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int v;
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if (unlikely(!rt)) return;
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if (hw_reset_gpio < 0)
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return;
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v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL,
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hw_reset_gpio, 0);
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v = SWITCH_GPIO(hw_reset, v, on);
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pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL,
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hw_reset_gpio, v);
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}
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static void ftr_gpio_all_amps_off(struct gpio_runtime *rt)
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{
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int saved;
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if (unlikely(!rt)) return;
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saved = rt->implementation_private;
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ftr_gpio_set_headphone(rt, 0);
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ftr_gpio_set_amp(rt, 0);
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ftr_gpio_set_lineout(rt, 0);
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rt->implementation_private = saved;
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}
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static void ftr_gpio_all_amps_restore(struct gpio_runtime *rt)
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{
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int s;
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if (unlikely(!rt)) return;
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s = rt->implementation_private;
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ftr_gpio_set_headphone(rt, (s>>0)&1);
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ftr_gpio_set_amp(rt, (s>>1)&1);
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ftr_gpio_set_lineout(rt, (s>>2)&1);
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}
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static void ftr_handle_notify(void *data)
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{
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struct gpio_notification *notif = data;
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mutex_lock(¬if->mutex);
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if (notif->notify)
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notif->notify(notif->data);
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mutex_unlock(¬if->mutex);
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}
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static void gpio_enable_dual_edge(int gpio)
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{
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int v;
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if (gpio == -1)
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return;
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v = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
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v |= 0x80; /* enable dual edge */
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pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, gpio, v);
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}
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static void ftr_gpio_init(struct gpio_runtime *rt)
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{
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get_gpio("headphone-mute", NULL,
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&headphone_mute_gpio,
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&headphone_mute_gpio_activestate);
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get_gpio("amp-mute", NULL,
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&_mute_gpio,
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&_mute_gpio_activestate);
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get_gpio("lineout-mute", NULL,
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&lineout_mute_gpio,
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&lineout_mute_gpio_activestate);
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get_gpio("hw-reset", "audio-hw-reset",
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&hw_reset_gpio,
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&hw_reset_gpio_activestate);
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headphone_detect_node = get_gpio("headphone-detect", NULL,
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&headphone_detect_gpio,
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&headphone_detect_gpio_activestate);
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/* go Apple, and thanks for giving these different names
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* across the board... */
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lineout_detect_node = get_gpio("lineout-detect", "line-output-detect",
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&lineout_detect_gpio,
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&lineout_detect_gpio_activestate);
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linein_detect_node = get_gpio("linein-detect", "line-input-detect",
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&linein_detect_gpio,
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&linein_detect_gpio_activestate);
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gpio_enable_dual_edge(headphone_detect_gpio);
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gpio_enable_dual_edge(lineout_detect_gpio);
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gpio_enable_dual_edge(linein_detect_gpio);
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get_irq(headphone_detect_node, &headphone_detect_irq);
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get_irq(lineout_detect_node, &lineout_detect_irq);
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get_irq(linein_detect_node, &linein_detect_irq);
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ftr_gpio_all_amps_off(rt);
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rt->implementation_private = 0;
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INIT_WORK(&rt->headphone_notify.work, ftr_handle_notify,
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&rt->headphone_notify);
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INIT_WORK(&rt->line_in_notify.work, ftr_handle_notify,
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&rt->line_in_notify);
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INIT_WORK(&rt->line_out_notify.work, ftr_handle_notify,
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&rt->line_out_notify);
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mutex_init(&rt->headphone_notify.mutex);
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mutex_init(&rt->line_in_notify.mutex);
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mutex_init(&rt->line_out_notify.mutex);
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}
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static void ftr_gpio_exit(struct gpio_runtime *rt)
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{
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ftr_gpio_all_amps_off(rt);
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rt->implementation_private = 0;
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if (rt->headphone_notify.notify)
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free_irq(headphone_detect_irq, &rt->headphone_notify);
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if (rt->line_in_notify.gpio_private)
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free_irq(linein_detect_irq, &rt->line_in_notify);
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if (rt->line_out_notify.gpio_private)
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free_irq(lineout_detect_irq, &rt->line_out_notify);
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cancel_delayed_work(&rt->headphone_notify.work);
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cancel_delayed_work(&rt->line_in_notify.work);
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cancel_delayed_work(&rt->line_out_notify.work);
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flush_scheduled_work();
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mutex_destroy(&rt->headphone_notify.mutex);
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mutex_destroy(&rt->line_in_notify.mutex);
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mutex_destroy(&rt->line_out_notify.mutex);
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}
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static irqreturn_t ftr_handle_notify_irq(int xx,
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void *data,
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struct pt_regs *regs)
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{
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struct gpio_notification *notif = data;
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schedule_work(¬if->work);
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return IRQ_HANDLED;
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}
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static int ftr_set_notify(struct gpio_runtime *rt,
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enum notify_type type,
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notify_func_t notify,
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void *data)
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{
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struct gpio_notification *notif;
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notify_func_t old;
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int irq;
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char *name;
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int err = -EBUSY;
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switch (type) {
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case AOA_NOTIFY_HEADPHONE:
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notif = &rt->headphone_notify;
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name = "headphone-detect";
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irq = headphone_detect_irq;
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break;
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case AOA_NOTIFY_LINE_IN:
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notif = &rt->line_in_notify;
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name = "linein-detect";
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irq = linein_detect_irq;
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break;
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case AOA_NOTIFY_LINE_OUT:
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notif = &rt->line_out_notify;
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name = "lineout-detect";
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irq = lineout_detect_irq;
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break;
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default:
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return -EINVAL;
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}
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if (irq == NO_IRQ)
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return -ENODEV;
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mutex_lock(¬if->mutex);
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old = notif->notify;
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if (!old && !notify) {
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err = 0;
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goto out_unlock;
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}
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if (old && notify) {
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if (old == notify && notif->data == data)
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err = 0;
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goto out_unlock;
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}
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if (old && !notify)
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free_irq(irq, notif);
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if (!old && notify) {
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err = request_irq(irq, ftr_handle_notify_irq, 0, name, notif);
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if (err)
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goto out_unlock;
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}
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notif->notify = notify;
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notif->data = data;
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err = 0;
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out_unlock:
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mutex_unlock(¬if->mutex);
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return err;
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}
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static int ftr_get_detect(struct gpio_runtime *rt,
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enum notify_type type)
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{
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int gpio, ret, active;
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switch (type) {
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case AOA_NOTIFY_HEADPHONE:
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gpio = headphone_detect_gpio;
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active = headphone_detect_gpio_activestate;
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break;
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case AOA_NOTIFY_LINE_IN:
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gpio = linein_detect_gpio;
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active = linein_detect_gpio_activestate;
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break;
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case AOA_NOTIFY_LINE_OUT:
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gpio = lineout_detect_gpio;
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active = lineout_detect_gpio_activestate;
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break;
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default:
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return -EINVAL;
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}
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if (gpio == -1)
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return -ENODEV;
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ret = pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, gpio, 0);
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if (ret < 0)
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return ret;
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return ((ret >> 1) & 1) == active;
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}
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static struct gpio_methods methods = {
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.init = ftr_gpio_init,
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.exit = ftr_gpio_exit,
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.all_amps_off = ftr_gpio_all_amps_off,
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.all_amps_restore = ftr_gpio_all_amps_restore,
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.set_headphone = ftr_gpio_set_headphone,
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.set_speakers = ftr_gpio_set_amp,
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.set_lineout = ftr_gpio_set_lineout,
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.set_hw_reset = ftr_gpio_set_hw_reset,
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.get_headphone = ftr_gpio_get_headphone,
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.get_speakers = ftr_gpio_get_amp,
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.get_lineout = ftr_gpio_get_lineout,
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.set_notify = ftr_set_notify,
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.get_detect = ftr_get_detect,
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};
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struct gpio_methods *ftr_gpio_methods = &methods;
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EXPORT_SYMBOL_GPL(ftr_gpio_methods);
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