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Release 4.8 sound/aoa/core/gpio-feature.c

Directory: sound/aoa/core
/*
 * 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 <linux/of_irq.h>
#include <linux/interrupt.h>
#include <asm/pmac_feature.h>
#include "../aoa.h"

/* TODO: these are lots of 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 master_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 master_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; }

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

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/* 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); FTR_GPIO(master, 3);
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); }

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static struct gpio_methods methods;
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); if (methods.set_master) ftr_gpio_set_master(rt, 0); rt->implementation_private = saved; }

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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); if (methods.set_master) ftr_gpio_set_master(rt, (s>>3)&1); }

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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); }

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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); }

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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); if (get_gpio("master-mute", NULL, &master_mute_gpio, &master_mute_gpio_activestate)) { methods.set_master = ftr_gpio_set_master; methods.get_master = ftr_gpio_get_master; } 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); }

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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_sync(&rt->headphone_notify.work); cancel_delayed_work_sync(&rt->line_in_notify.work); cancel_delayed_work_sync(&rt->line_out_notify.work); mutex_destroy(&rt->headphone_notify.mutex); mutex_destroy(&rt->line_in_notify.mutex); mutex_destroy(&rt->line_out_notify.mutex); }

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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; }

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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; }

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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; }

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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);

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Directory: sound/aoa/core
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