[PATCH] ppc32: add sound support for Mac Mini

This patch applies on top of my previous g5 related sound patches and adds
support for the Mac Mini to the PowerMac Alsa driver.

However, I haven't found any kind of HW support for volume control on this
machine.  If it exist, it's well hidden.  That means that you probably want
to make sure you use software with the ability to do soft volume control,
or use Alsa 0.9 pre-release with the softvol plugin.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 380 insertions, 0 deletions

diff --git a/sound/ppc/toonie.c b/sound/ppc/toonie.c
new file mode 100644
index 000000000000..0f909193b4fb
--- /dev/null
+++ b/sound/ppc/toonie.c
@@ -0,0 +1,380 @@
+/*
+ * Mac Mini "toonie" mixer control
+ *
+ * Copyright (c) 2005 by Benjamin Herrenschmidt <benh@kernel.crashing.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <sound/driver.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/i2c-dev.h>
+#include <linux/kmod.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <sound/core.h>
+#include <asm/io.h>
+#include <asm/irq.h>
+#include <asm/machdep.h>
+#include <asm/pmac_feature.h>
+#include "pmac.h"
+
+#undef DEBUG
+
+#ifdef DEBUG
+#define DBG(fmt...) printk(fmt)
+#else
+#define DBG(fmt...)
+#endif
+
+struct pmac_gpio {
+        unsigned int addr;
+        u8 active_val;
+        u8 inactive_val;
+        u8 active_state;
+};
+
+struct pmac_toonie
+{
+        struct pmac_gpio        hp_detect_gpio;
+        struct pmac_gpio        hp_mute_gpio;
+        struct pmac_gpio        amp_mute_gpio;
+        int                     hp_detect_irq;
+        int                     auto_mute_notify;
+        struct work_struct      detect_work;
+};
+
+
+/*
+ * gpio access
+ */
+#define do_gpio_write(gp, val) \
+        pmac_call_feature(PMAC_FTR_WRITE_GPIO, NULL, (gp)->addr, val)
+#define do_gpio_read(gp) \
+        pmac_call_feature(PMAC_FTR_READ_GPIO, NULL, (gp)->addr, 0)
+#define tumbler_gpio_free(gp) /* NOP */
+
+static void write_audio_gpio(struct pmac_gpio *gp, int active)
+{
+        if (! gp->addr)
+                return;
+        active = active ? gp->active_val : gp->inactive_val;
+        do_gpio_write(gp, active);
+        DBG("(I) gpio %x write %d\n", gp->addr, active);
+}
+
+static int check_audio_gpio(struct pmac_gpio *gp)
+{
+        int ret;
+
+        if (! gp->addr)
+                return 0;
+
+        ret = do_gpio_read(gp);
+
+        return (ret & 0xd) == (gp->active_val & 0xd);
+}
+
+static int read_audio_gpio(struct pmac_gpio *gp)
+{
+        int ret;
+        if (! gp->addr)
+                return 0;
+        ret = ((do_gpio_read(gp) & 0x02) !=0);
+        return ret == gp->active_state;
+}
+
+
+enum { TOONIE_MUTE_HP, TOONIE_MUTE_AMP };
+
+static int toonie_get_mute_switch(snd_kcontrol_t *kcontrol,
+                                  snd_ctl_elem_value_t *ucontrol)
+{
+        pmac_t *chip = snd_kcontrol_chip(kcontrol);
+        struct pmac_toonie *mix = chip->mixer_data;
+        struct pmac_gpio *gp;
+
+        if (mix == NULL)
+                return -ENODEV;
+        switch(kcontrol->private_value) {
+        case TOONIE_MUTE_HP:
+                gp = &mix->hp_mute_gpio;
+                break;
+        case TOONIE_MUTE_AMP:
+                gp = &mix->amp_mute_gpio;
+                break;
+        default:
+                return -EINVAL;;
+        }
+        ucontrol->value.integer.value[0] = !check_audio_gpio(gp);
+        return 0;
+}
+
+static int toonie_put_mute_switch(snd_kcontrol_t *kcontrol,
+                                   snd_ctl_elem_value_t *ucontrol)
+{
+        pmac_t *chip = snd_kcontrol_chip(kcontrol);
+        struct pmac_toonie *mix = chip->mixer_data;
+        struct pmac_gpio *gp;
+        int val;
+
+        if (chip->update_automute && chip->auto_mute)
+                return 0; /* don't touch in the auto-mute mode */
+
+        if (mix == NULL)
+                return -ENODEV;
+
+        switch(kcontrol->private_value) {
+        case TOONIE_MUTE_HP:
+                gp = &mix->hp_mute_gpio;
+                break;
+        case TOONIE_MUTE_AMP:
+                gp = &mix->amp_mute_gpio;
+                break;
+        default:
+                return -EINVAL;;
+        }
+        val = ! check_audio_gpio(gp);
+        if (val != ucontrol->value.integer.value[0]) {
+                write_audio_gpio(gp, ! ucontrol->value.integer.value[0]);
+                return 1;
+        }
+        return 0;
+}
+
+static snd_kcontrol_new_t toonie_hp_sw __initdata = {
+        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+        .name = "Headphone Playback Switch",
+        .info = snd_pmac_boolean_mono_info,
+        .get = toonie_get_mute_switch,
+        .put = toonie_put_mute_switch,
+        .private_value = TOONIE_MUTE_HP,
+};
+static snd_kcontrol_new_t toonie_speaker_sw __initdata = {
+        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+        .name = "PC Speaker Playback Switch",
+        .info = snd_pmac_boolean_mono_info,
+        .get = toonie_get_mute_switch,
+        .put = toonie_put_mute_switch,
+        .private_value = TOONIE_MUTE_AMP,
+};
+
+/*
+ * auto-mute stuffs
+ */
+static int toonie_detect_headphone(pmac_t *chip)
+{
+        struct pmac_toonie *mix = chip->mixer_data;
+        int detect = 0;
+
+        if (mix->hp_detect_gpio.addr)
+                detect |= read_audio_gpio(&mix->hp_detect_gpio);
+        return detect;
+}
+
+static void toonie_check_mute(pmac_t *chip, struct pmac_gpio *gp, int val,
+                              int do_notify, snd_kcontrol_t *sw)
+{
+        if (check_audio_gpio(gp) != val) {
+                write_audio_gpio(gp, val);
+                if (do_notify)
+                        snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
+                                       &sw->id);
+        }
+}
+
+static void toonie_detect_handler(void *self)
+{
+        pmac_t *chip = (pmac_t*) self;
+        struct pmac_toonie *mix;
+        int headphone;
+
+        if (!chip)
+                return;
+
+        mix = chip->mixer_data;
+        snd_assert(mix, return);
+
+        headphone = toonie_detect_headphone(chip);
+
+        DBG("headphone: %d, lineout: %d\n", headphone, lineout);
+
+        if (headphone) {
+                /* unmute headphone/lineout & mute speaker */
+                toonie_check_mute(chip, &mix->hp_mute_gpio, 0,
+                                  mix->auto_mute_notify, chip->master_sw_ctl);
+                toonie_check_mute(chip, &mix->amp_mute_gpio, 1,
+                                  mix->auto_mute_notify, chip->speaker_sw_ctl);
+        } else {
+                /* unmute speaker, mute others */
+                toonie_check_mute(chip, &mix->amp_mute_gpio, 0,
+                                  mix->auto_mute_notify, chip->speaker_sw_ctl);
+                toonie_check_mute(chip, &mix->hp_mute_gpio, 1,
+                                  mix->auto_mute_notify, chip->master_sw_ctl);
+        }
+        if (mix->auto_mute_notify) {
+                snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
+                                       &chip->hp_detect_ctl->id);
+        }
+}
+
+static void toonie_update_automute(pmac_t *chip, int do_notify)
+{
+        if (chip->auto_mute) {
+                struct pmac_toonie *mix;
+                mix = chip->mixer_data;
+                snd_assert(mix, return);
+                mix->auto_mute_notify = do_notify;
+                schedule_work(&mix->detect_work);
+        }
+}
+
+/* interrupt - headphone plug changed */
+static irqreturn_t toonie_hp_intr(int irq, void *devid, struct pt_regs *regs)
+{
+        pmac_t *chip = devid;
+
+        if (chip->update_automute && chip->initialized) {
+                chip->update_automute(chip, 1);
+                return IRQ_HANDLED;
+        }
+        return IRQ_NONE;
+}
+
+/* look for audio gpio device */
+static int find_audio_gpio(const char *name, const char *platform,
+                           struct pmac_gpio *gp)
+{
+        struct device_node *np;
+        u32 *base, addr;
+
+        if (! (np = find_devices("gpio")))
+                return -ENODEV;
+
+        for (np = np->child; np; np = np->sibling) {
+                char *property = get_property(np, "audio-gpio", NULL);
+                if (property && strcmp(property, name) == 0)
+                        break;
+                if (device_is_compatible(np, name))
+                        break;
+        }
+        if (np == NULL)
+                return -ENODEV;
+
+        base = (u32 *)get_property(np, "AAPL,address", NULL);
+        if (! base) {
+                base = (u32 *)get_property(np, "reg", NULL);
+                if (!base) {
+                        DBG("(E) cannot find address for device %s !\n", device);
+                        snd_printd("cannot find address for device %s\n", device);
+                        return -ENODEV;
+                }
+                addr = *base;
+                if (addr < 0x50)
+                        addr += 0x50;
+        } else
+                addr = *base;
+
+        gp->addr = addr & 0x0000ffff;
+
+        /* Try to find the active state, default to 0 ! */
+        base = (u32 *)get_property(np, "audio-gpio-active-state", NULL);
+        if (base) {
+                gp->active_state = *base;
+                gp->active_val = (*base) ? 0x5 : 0x4;
+                gp->inactive_val = (*base) ? 0x4 : 0x5;
+        } else {
+                u32 *prop = NULL;
+                gp->active_state = 0;
+                gp->active_val = 0x4;
+                gp->inactive_val = 0x5;
+                /* Here are some crude hacks to extract the GPIO polarity and
+                 * open collector informations out of the do-platform script
+                 * as we don't yet have an interpreter for these things
+                 */
+                if (platform)
+                        prop = (u32 *)get_property(np, platform, NULL);
+                if (prop) {
+                        if (prop[3] == 0x9 && prop[4] == 0x9) {
+                                gp->active_val = 0xd;
+                                gp->inactive_val = 0xc;
+                        }
+                        if (prop[3] == 0x1 && prop[4] == 0x1) {
+                                gp->active_val = 0x5;
+                                gp->inactive_val = 0x4;
+                        }
+                }
+        }
+
+        DBG("(I) GPIO device %s found, offset: %x, active state: %d !\n",
+            device, gp->addr, gp->active_state);
+
+        return (np->n_intrs > 0) ? np->intrs[0].line : 0;
+}
+
+static void toonie_cleanup(pmac_t *chip)
+{
+        struct pmac_toonie *mix = chip->mixer_data;
+        if (! mix)
+                return;
+        if (mix->hp_detect_irq >= 0)
+                free_irq(mix->hp_detect_irq, chip);
+        kfree(mix);
+        chip->mixer_data = NULL;
+}
+
+int snd_pmac_toonie_init(pmac_t *chip)
+{
+        struct pmac_toonie *mix;
+
+        mix = kmalloc(sizeof(*mix), GFP_KERNEL);
+        if (! mix)
+                return -ENOMEM;
+
+        chip->mixer_data = mix;
+        chip->mixer_free = toonie_cleanup;
+
+        find_audio_gpio("headphone-mute", NULL, &mix->hp_mute_gpio);
+        find_audio_gpio("amp-mute", NULL, &mix->amp_mute_gpio);
+        mix->hp_detect_irq = find_audio_gpio("headphone-detect",
+                                             NULL, &mix->hp_detect_gpio);
+
+        strcpy(chip->card->mixername, "PowerMac Toonie");
+
+        chip->master_sw_ctl = snd_ctl_new1(&toonie_hp_sw, chip);
+        snd_ctl_add(chip->card, chip->master_sw_ctl);
+
+        chip->speaker_sw_ctl = snd_ctl_new1(&toonie_speaker_sw, chip);
+        snd_ctl_add(chip->card, chip->speaker_sw_ctl);
+
+        INIT_WORK(&mix->detect_work, toonie_detect_handler, (void *)chip);
+
+        if (mix->hp_detect_irq >= 0) {
+                snd_pmac_add_automute(chip);
+
+                chip->detect_headphone = toonie_detect_headphone;
+                chip->update_automute = toonie_update_automute;
+                toonie_update_automute(chip, 0);
+
+                if (request_irq(mix->hp_detect_irq, toonie_hp_intr, 0,
+                                "Sound Headphone Detection", chip) < 0)
+                        mix->hp_detect_irq = -1;
+        }
+
+        return 0;
+}
+