[ALSA] snd-aoa: add snd-aoa

This large patch adds all of snd-aoa.
Consisting of many modules, it currently replaces snd-powermac
for all layout-id based machines and handles many more (for
example new powerbooks and powermacs with digital output that
previously couldn't be used at all).
It also has support for all layout-IDs that Apple has (judging
from their Info.plist file) but not all are tested.
The driver currently has 2 known regressions over snd-powermac:
 * it doesn't handle powermac 7,2 and 7,3
 * it doesn't have a DRC control on snapper-based machines
I will fix those during the 2.6.18 development cycle.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 399 insertions, 0 deletions

diff --git a/sound/aoa/core/snd-aoa-gpio-feature.c b/sound/aoa/core/snd-aoa-gpio-feature.c
new file mode 100644
index 000000000000..2c6eb7784cc9
--- /dev/null
+++ b/sound/aoa/core/snd-aoa-gpio-feature.c
@@ -0,0 +1,399 @@
+/*
+ * 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;
+        u32 *reg;
+        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 = 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 = (u32 *)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 = (u32 *)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)
+{
+        *irqptr = -1;
+        if (!np)
+                return;
+        if (np->n_intrs != 1)
+                return;
+        *irqptr = np->intrs[0].line;
+}
+
+/* 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(void *data)
+{
+        struct gpio_notification *notif = data;
+
+        mutex_lock(&notif->mutex);
+        if (notif->notify)
+                notif->notify(notif->data);
+        mutex_unlock(&notif->mutex);
+}
+
+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);
+
+        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_WORK(&rt->headphone_notify.work, ftr_handle_notify,
+                  &rt->headphone_notify);
+        INIT_WORK(&rt->line_in_notify.work, ftr_handle_notify,
+                  &rt->line_in_notify);
+        INIT_WORK(&rt->line_out_notify.work, ftr_handle_notify,
+                  &rt->line_out_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 pt_regs *regs)
+{
+        struct gpio_notification *notif = data;
+
+        schedule_work(&notif->work);
+
+        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 == -1)
+                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);