[PATCH] pmac: Improve sleep code of tumbler driver

This patch improves the behaviour of the "tumbler/snapper" driver used on
newer PowerMacs during sleep.  It properly set the HW mutes to shut down
amplifiers and does an analog shutdown of the codec.  That might improve
power consumption during sleep on a number of machines.
Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

sound/ppc/tumbler.c

@@ -94,12 +94,17 @@ typedef struct pmac_tumbler_t {
 	pmac_gpio_t hp_detect;
 	int headphone_irq;
 	unsigned int master_vol[2];
+	unsigned int save_master_switch[2];
 	unsigned int master_switch[2];
 	unsigned int mono_vol[VOL_IDX_LAST_MONO];
 	unsigned int mix_vol[VOL_IDX_LAST_MIX][2]; /* stereo volumes for tas3004 */
 	int drc_range;
 	int drc_enable;
 	int capture_source;
+	int anded_reset;
+	int auto_mute_notify;
+	int reset_on_sleep;
+	u8  acs;
 } pmac_tumbler_t;
 
 
@@ -654,7 +659,8 @@ static int snapper_put_mix(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *ucont
 
 
 /*
- * mute switches
+ * mute switches. FIXME: Turn that into software mute when both outputs are muted
+ * to avoid codec reset on ibook M7
  */
 
 enum { TUMBLER_MUTE_HP, TUMBLER_MUTE_AMP };
@@ -696,8 +702,11 @@ static int snapper_set_capture_source(pmac_tumbler_t *mix)
 {
 	if (! mix->i2c.client)
 		return -ENODEV;
-	return i2c_smbus_write_byte_data(mix->i2c.client, TAS_REG_ACS,
-					 mix->capture_source ? 2 : 0);
+	if (mix->capture_source)
+		mix->acs = mix->acs |= 2;
+	else
+		mix->acs &= ~2;
+	return i2c_smbus_write_byte_data(mix->i2c.client, TAS_REG_ACS, mix->acs);
 }
 
 static int snapper_info_capture_source(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *uinfo)
@@ -855,8 +864,7 @@ static void check_mute(pmac_t *chip, pmac_gpio_t *gp, int val, int do_notify, sn
 
 static struct work_struct device_change;
 
-static void
-device_change_handler(void *self)
+static void device_change_handler(void *self)
 {
 	pmac_t *chip = (pmac_t*) self;
 	pmac_tumbler_t *mix;
@@ -865,6 +873,33 @@ device_change_handler(void *self)
 		return;
 
 	mix = chip->mixer_data;
+	snd_assert(mix, return);
+
+	if (tumbler_detect_headphone(chip)) {
+		/* mute speaker */
+		check_mute(chip, &mix->hp_mute, 0, mix->auto_mute_notify,
+			   chip->master_sw_ctl);
+		if (mix->anded_reset)
+			big_mdelay(10);
+		check_mute(chip, &mix->amp_mute, 1, mix->auto_mute_notify,
+			   chip->speaker_sw_ctl);
+		mix->drc_enable = 0;
+	} else {
+		/* unmute speaker */
+		check_mute(chip, &mix->amp_mute, 0, mix->auto_mute_notify,
+			   chip->speaker_sw_ctl);
+		if (mix->anded_reset)
+			big_mdelay(10);
+		check_mute(chip, &mix->hp_mute, 1, mix->auto_mute_notify,
+			   chip->master_sw_ctl);
+		mix->drc_enable = 1;
+	}
+	if (mix->auto_mute_notify) {
+		snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
+				       &chip->hp_detect_ctl->id);
+		snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
+			       &chip->drc_sw_ctl->id);
+	}
 
 	/* first set the DRC so the speaker do not explode -ReneR */
 	if (chip->model == PMAC_TUMBLER)
@@ -879,31 +914,11 @@ device_change_handler(void *self)
 static void tumbler_update_automute(pmac_t *chip, int do_notify)
 {
 	if (chip->auto_mute) {
-		pmac_tumbler_t *mix = chip->mixer_data;
+		pmac_tumbler_t *mix;
+		mix = chip->mixer_data;
 		snd_assert(mix, return);
-		if (tumbler_detect_headphone(chip)) {
-			/* mute speaker */
-			check_mute(chip, &mix->amp_mute, 1, do_notify, chip->speaker_sw_ctl);
-			check_mute(chip, &mix->hp_mute, 0, do_notify, chip->master_sw_ctl);
-			mix->drc_enable = 0;
-
-		} else {
-			/* unmute speaker */
-			check_mute(chip, &mix->amp_mute, 0, do_notify, chip->speaker_sw_ctl);
-			check_mute(chip, &mix->hp_mute, 1, do_notify, chip->master_sw_ctl);
-			mix->drc_enable = 1;
-		}
-		if (do_notify) {
-			snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
-				       &chip->hp_detect_ctl->id);
-			snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
-			               &chip->drc_sw_ctl->id);
-		}
-
-		/* finally we need to schedule an update of the mixer values
-		   (master and DRC are enough for now) -ReneR */
+		mix->auto_mute_notify = do_notify;
 		schedule_work(&device_change);
-
 	}
 }
 #endif /* PMAC_SUPPORT_AUTOMUTE */
@@ -1002,15 +1017,53 @@ static void tumbler_reset_audio(pmac_t *chip)
 {
 	pmac_tumbler_t *mix = chip->mixer_data;
 
-	write_audio_gpio(&mix->audio_reset, 0);
-	big_mdelay(200);
-	write_audio_gpio(&mix->audio_reset, 1);
-	big_mdelay(100);
-	write_audio_gpio(&mix->audio_reset, 0);
-	big_mdelay(100);
+	if (mix->anded_reset) {
+		write_audio_gpio(&mix->hp_mute, 0);
+		write_audio_gpio(&mix->amp_mute, 0);
+		big_mdelay(200);
+		write_audio_gpio(&mix->hp_mute, 1);
+		write_audio_gpio(&mix->amp_mute, 1);
+		big_mdelay(100);
+		write_audio_gpio(&mix->hp_mute, 0);
+		write_audio_gpio(&mix->amp_mute, 0);
+		big_mdelay(100);
+	} else {
+		write_audio_gpio(&mix->audio_reset, 0);
+		big_mdelay(200);
+		write_audio_gpio(&mix->audio_reset, 1);
+		big_mdelay(100);
+		write_audio_gpio(&mix->audio_reset, 0);
+		big_mdelay(100);
+	}
 }
 
 #ifdef CONFIG_PMAC_PBOOK
+/* suspend mixer */
+static void tumbler_suspend(pmac_t *chip)
+{
+	pmac_tumbler_t *mix = chip->mixer_data;
+
+	if (mix->headphone_irq >= 0)
+		disable_irq(mix->headphone_irq);
+	mix->save_master_switch[0] = mix->master_switch[0];
+	mix->save_master_switch[1] = mix->master_switch[1];
+	mix->master_switch[0] = mix->master_switch[1] = 0;
+	tumbler_set_master_volume(mix);
+	if (!mix->anded_reset) {
+		write_audio_gpio(&mix->amp_mute, 1);
+		write_audio_gpio(&mix->hp_mute, 1);
+	}
+	if (chip->model == PMAC_SNAPPER) {
+		mix->acs |= 1;
+		i2c_smbus_write_byte_data(mix->i2c.client, TAS_REG_ACS, mix->acs);
+	}
+	if (mix->anded_reset) {
+		write_audio_gpio(&mix->amp_mute, 1);
+		write_audio_gpio(&mix->hp_mute, 1);
+	} else
+		write_audio_gpio(&mix->audio_reset, 1);
+}
+
 /* resume mixer */
 static void tumbler_resume(pmac_t *chip)
 {
@@ -1018,6 +1071,9 @@ static void tumbler_resume(pmac_t *chip)
 
 	snd_assert(mix, return);
 
+	mix->acs &= ~1;
+	mix->master_switch[0] = mix->save_master_switch[0];
+	mix->master_switch[1] = mix->save_master_switch[1];
 	tumbler_reset_audio(chip);
 	if (mix->i2c.client && mix->i2c.init_client) {
 		if (mix->i2c.init_client(&mix->i2c) < 0)
@@ -1041,6 +1097,8 @@ static void tumbler_resume(pmac_t *chip)
 	tumbler_set_master_volume(mix);
 	if (chip->update_automute)
 		chip->update_automute(chip, 0);
+	if (mix->headphone_irq >= 0)
+		enable_irq(mix->headphone_irq);
 }
 #endif
 
@@ -1103,7 +1161,7 @@ int __init snd_pmac_tumbler_init(pmac_t *chip)
 	int i, err;
 	pmac_tumbler_t *mix;
 	u32 *paddr;
-	struct device_node *tas_node;
+	struct device_node *tas_node, *np;
 	char *chipname;
 
 #ifdef CONFIG_KMOD
@@ -1119,7 +1177,18 @@ int __init snd_pmac_tumbler_init(pmac_t *chip)
 
 	chip->mixer_data = mix;
 	chip->mixer_free = tumbler_cleanup;
-
+	mix->anded_reset = 0;
+	mix->reset_on_sleep = 1;
+
+	for (np = chip->node->child; np; np = np->sibling) {
+		if (!strcmp(np->name, "sound")) {
+			if (get_property(np, "has-anded-reset", NULL))
+				mix->anded_reset = 1;
+			if (get_property(np, "layout-id", NULL))
+				mix->reset_on_sleep = 0;
+			break;
+		}
+	}
 	if ((err = tumbler_init(chip)) < 0)
 		return err;
 
@@ -1178,6 +1247,7 @@ int __init snd_pmac_tumbler_init(pmac_t *chip)
 		return err;
 
 #ifdef CONFIG_PMAC_PBOOK
+	chip->suspend = tumbler_suspend;
 	chip->resume = tumbler_resume;
 #endif