Merge "ALSA: core: Expose sound card online/offline state" into msm-4.8 (f93ad4cf) · Commits · e / devices / android_kernel_fairphone_FP3

include/sound/core.h

+5 −0

Original line number	Diff line number	Diff line
		@@ -135,6 +135,9 @@ struct snd_card {
		struct device card_dev; /* cardX object for sysfs */
		const struct attribute_group dev_groups[4]; / assigned sysfs attr */
		bool registered; /* card_dev is registered? */
		int offline; /* if this sound card is offline */
		unsigned long offline_change;
		wait_queue_head_t offline_poll_wait;

		#ifdef CONFIG_PM
		unsigned int power_state; /* power state */
		@@ -266,6 +269,8 @@ int snd_component_add(struct snd_card card, const char component);
		int snd_card_file_add(struct snd_card card, struct file file);
		int snd_card_file_remove(struct snd_card card, struct file file);
		#define snd_card_unref(card) put_device(&(card)->card_dev)
		void snd_card_change_online_state(struct snd_card *card, int online);
		bool snd_card_is_online_state(struct snd_card *card);

		#define snd_card_set_dev(card, devptr) ((card)->dev = (devptr))

include/sound/soc.h

+2 −1

Original line number	Diff line number	Diff line
		@@ -575,12 +575,13 @@ int snd_soc_update_bits_locked(struct snd_soc_codec *codec,
		int snd_soc_test_bits(struct snd_soc_codec *codec, unsigned int reg,
		unsigned int mask, unsigned int value);

		void snd_soc_card_change_online_state(struct snd_soc_card *soc_card,
		int online);
		#ifdef CONFIG_SND_SOC_AC97_BUS
		struct snd_ac97 snd_soc_alloc_ac97_codec(struct snd_soc_codec codec);
		struct snd_ac97 snd_soc_new_ac97_codec(struct snd_soc_codec codec,
		unsigned int id, unsigned int id_mask);
		void snd_soc_free_ac97_codec(struct snd_ac97 *ac97);

		int snd_soc_set_ac97_ops(struct snd_ac97_bus_ops *ops);
		int snd_soc_set_ac97_ops_of_reset(struct snd_ac97_bus_ops *ops,
		struct platform_device *pdev);

sound/core/init.c

+74 −1

Original line number	Diff line number	Diff line
		@@ -58,6 +58,8 @@ static char *slots[SNDRV_CARDS];
		module_param_array(slots, charp, NULL, 0444);
		MODULE_PARM_DESC(slots, "Module names assigned to the slots.");

		#define SND_CARD_STATE_MAX_LEN 16

		/* return non-zero if the given index is reserved for the given
		* module via slots option
		*/
		@@ -107,9 +109,39 @@ static void snd_card_id_read(struct snd_info_entry *entry,
		snd_iprintf(buffer, "%s\n", entry->card->id);
		}

		static ssize_t snd_card_state_read(struct snd_info_entry *entry,
		void file_private_data, struct file file,
		char __user *buf, size_t count, loff_t pos)
		{
		int len;
		char buffer[SND_CARD_STATE_MAX_LEN];

		/* make sure offline is updated prior to wake up */
		rmb();
		len = snprintf(buffer, sizeof(buffer), "%s\n",
		entry->card->offline ? "OFFLINE" : "ONLINE");
		return simple_read_from_buffer(buf, count, &pos, buffer, len);
		}

		static unsigned int snd_card_state_poll(struct snd_info_entry *entry,
		void private_data, struct file file,
		poll_table *wait)
		{
		poll_wait(file, &entry->card->offline_poll_wait, wait);
		if (xchg(&entry->card->offline_change, 0))
		return POLLIN \| POLLPRI \| POLLRDNORM;
		else
		return 0;
		}

		static struct snd_info_entry_ops snd_card_state_proc_ops = {
		.read = snd_card_state_read,
		.poll = snd_card_state_poll,
		};

		static int init_info_for_card(struct snd_card *card)
		{
		struct snd_info_entry *entry;
		struct snd_info_entry entry, entry_state;

		entry = snd_info_create_card_entry(card, "id", card->proc_root);
		if (!entry) {
		@@ -119,6 +151,17 @@ static int init_info_for_card(struct snd_card *card)
		entry->c.text.read = snd_card_id_read;
		card->proc_id = entry;

		entry_state = snd_info_create_card_entry(card, "state",
		card->proc_root);
		if (!entry_state) {
		dev_dbg(card->dev, "unable to create card entry state\n");
		card->proc_id = NULL;
		return -ENOMEM;
		}
		entry_state->size = SND_CARD_STATE_MAX_LEN;
		entry_state->content = SNDRV_INFO_CONTENT_DATA;
		entry_state->c.ops = &snd_card_state_proc_ops;

		return snd_info_card_register(card);
		}
		#else /* !CONFIG_SND_PROC_FS */
		@@ -258,6 +301,7 @@ int snd_card_new(struct device parent, int idx, const char xid,
		init_waitqueue_head(&card->power_sleep);
		#endif

		init_waitqueue_head(&card->offline_poll_wait);
		device_initialize(&card->card_dev);
		card->card_dev.parent = parent;
		card->card_dev.class = sound_class;
		@@ -975,6 +1019,35 @@ int snd_card_file_remove(struct snd_card card, struct file file)

		EXPORT_SYMBOL(snd_card_file_remove);

		/**
		* snd_card_change_online_state - mark card's online/offline state
		* @card: Card to mark
		* @online: whether online of offline
		*
		* Mutes the DAI DAC.
		*/
		void snd_card_change_online_state(struct snd_card *card, int online)
		{
		snd_printd("snd card %s state change %d -> %d\n",
		card->shortname, !card->offline, online);
		card->offline = !online;
		/* make sure offline is updated prior to wake up */
		wmb();
		xchg(&card->offline_change, 1);
		wake_up_interruptible(&card->offline_poll_wait);
		}
		EXPORT_SYMBOL(snd_card_change_online_state);

		/**
		* snd_card_is_online_state - return true if card is online state
		* @card: Card to query
		*/
		bool snd_card_is_online_state(struct snd_card *card)
		{
		return !card->offline;
		}
		EXPORT_SYMBOL(snd_card_is_online_state);

		#ifdef CONFIG_PM
		/**
		* snd_power_wait - wait until the power-state is changed.

sound/soc/soc-core.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -3301,6 +3301,17 @@ static int snd_soc_codec_set_bias_level(struct snd_soc_dapm_context *dapm,
		return codec->driver->set_bias_level(codec, level);
		}

		/**
		* snd_soc_card_change_online_state - Mark if soc card is online/offline
		*
		* @soc_card : soc_card to mark
		*/
		void snd_soc_card_change_online_state(struct snd_soc_card *soc_card, int online)
		{
		snd_card_change_online_state(soc_card->snd_card, online);
		}
		EXPORT_SYMBOL(snd_soc_card_change_online_state);

		/**
		* snd_soc_register_codec - Register a codec with the ASoC core
		*

sound/soc/soc-io.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -195,9 +195,14 @@ EXPORT_SYMBOL_GPL(snd_soc_component_test_bits);

		unsigned int snd_soc_read(struct snd_soc_codec *codec, unsigned int reg)
		{
		struct snd_card *snd_card = codec->component.card->snd_card;
		unsigned int val;
		int ret;

		if (unlikely(!snd_card_is_online_state(snd_card))) {
		dev_err(codec->dev, "read 0x%02x while offline\n", reg);
		return -ENODEV;
		}
		ret = snd_soc_component_read(&codec->component, reg, &val);
		if (ret < 0)
		return -1;
		@@ -209,6 +214,12 @@ EXPORT_SYMBOL_GPL(snd_soc_read);
		int snd_soc_write(struct snd_soc_codec *codec, unsigned int reg,
		unsigned int val)
		{
		struct snd_card *snd_card = codec->component.card->snd_card;

		if (unlikely(!snd_card_is_online_state(snd_card))) {
		dev_err(codec->dev, "write 0x%02x while offline\n", reg);
		return -ENODEV;
		}
		return snd_soc_component_write(&codec->component, reg, val);
		}
		EXPORT_SYMBOL_GPL(snd_soc_write);