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Commit 4427a9f3 authored by Phani Kumar Uppalapati's avatar Phani Kumar Uppalapati Committed by Gerrit - the friendly Code Review server
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ASoC: wsa881x: Add support to expose wsa881x codec version 



Create wsa881x module and version info entry to expose
the chipset ID and version information of wsa881x audio
codec. Clients can use this information to identify codec
and its version which in turn can be used to access its
registers.

Change-Id: If1931585f16dffad50179ebd608a9f9999c8fe74
Signed-off-by: default avatarPhani Kumar Uppalapati <phaniu@codeaurora.org>
parent dab09558

sound/soc/codecs/wsa881x.c

+86 −0
Original line number Diff line number Diff line
@@ -89,6 +89,8 @@ struct wsa881x_priv { 
	int clk_cnt;

	struct mutex bg_lock;

	struct mutex res_lock;

	struct snd_info_entry *entry;

	struct snd_info_entry *version_entry;

};



#define SWR_SLV_MAX_REG_ADDR	0x390
@@ -99,6 +101,8 @@ struct wsa881x_priv { 
#define SWR_SLV_WR_BUF_LEN	32

#define SWR_SLV_MAX_DEVICES	2



#define WSA881X_VERSION_ENTRY_SIZE 27



static struct wsa881x_priv *dbgwsa881x;

static struct dentry *debugfs_wsa881x_dent;

static struct dentry *debugfs_peek;
@@ -139,6 +143,88 @@ static int get_parameters(char *buf, u32 *param1, int num_of_par) 
	return 0;

}



static ssize_t wsa881x_codec_version_read(struct snd_info_entry *entry,

			       void *file_private_data, struct file *file,

			       char __user *buf, size_t count, loff_t pos)

{

	struct wsa881x_priv *wsa881x;

	char buffer[WSA881X_VERSION_ENTRY_SIZE];

	int len;



	wsa881x = (struct wsa881x_priv *) entry->private_data;

	if (!wsa881x) {

		pr_err("%s: wsa881x priv is null\n", __func__);

		return -EINVAL;

	}



	len = snprintf(buffer, sizeof(buffer), "WSA881X-SOUNDWIRE_1_0\n");



	return simple_read_from_buffer(buf, count, &pos, buffer, len);

}



static struct snd_info_entry_ops wsa881x_codec_info_ops = {

	.read = wsa881x_codec_version_read,

};



/*

 * wsa881x_codec_info_create_codec_entry - creates wsa881x module

 * @codec_root: The parent directory

 * @codec: Codec instance

 *

 * Creates wsa881x module and version entry under the given

 * parent directory.

 *

 * Return: 0 on success or negative error code on failure.

 */

int wsa881x_codec_info_create_codec_entry(struct snd_info_entry *codec_root,

					  struct snd_soc_codec *codec)

{

	struct snd_info_entry *version_entry;

	struct wsa881x_priv *wsa881x;

	struct snd_soc_card *card;

	char name[80];



	if (!codec_root || !codec)

		return -EINVAL;



	wsa881x = snd_soc_codec_get_drvdata(codec);

	card = codec->component.card;

	snprintf(name, sizeof(name), "%s.%x", "wsa881x",

		 (u32)wsa881x->swr_slave->addr);



	wsa881x->entry = snd_register_module_info(codec_root->module,

						  (const char *)name,

						  codec_root);

	if (!wsa881x->entry) {

		dev_dbg(codec->dev, "%s: failed to create wsa881x entry\n",

			__func__);

		return -ENOMEM;

	}



	version_entry = snd_info_create_card_entry(card->snd_card,

						   "version",

						   wsa881x->entry);

	if (!version_entry) {

		dev_dbg(codec->dev, "%s: failed to create wsa881x version entry\n",

			__func__);

		return -ENOMEM;

	}



	version_entry->private_data = wsa881x;

	version_entry->size = WSA881X_VERSION_ENTRY_SIZE;

	version_entry->content = SNDRV_INFO_CONTENT_DATA;

	version_entry->c.ops = &wsa881x_codec_info_ops;



	if (snd_info_register(version_entry) < 0) {

		snd_info_free_entry(version_entry);

		return -ENOMEM;

	}

	wsa881x->version_entry = version_entry;



	return 0;

}

EXPORT_SYMBOL(wsa881x_codec_info_create_codec_entry);



static bool is_swr_slv_reg_readable(int reg)

{

	bool ret = true;

sound/soc/codecs/wsa881x.h

+4 −1
Original line number Diff line number Diff line
@@ -15,6 +15,7 @@ 


#include <linux/regmap.h>

#include <sound/soc.h>

#include <sound/info.h>

#include "wsa881x-registers.h"



#define WSA881X_MAX_SWR_PORTS   4
@@ -25,5 +26,7 @@ extern int wsa881x_set_channel_map(struct snd_soc_codec *codec, u8 *port, 


extern const u8 wsa881x_reg_readable[WSA881X_CACHE_SIZE];

extern struct regmap_config wsa881x_regmap_config;



extern int wsa881x_codec_info_create_codec_entry(

					struct snd_info_entry *codec_root,

					struct snd_soc_codec *codec);

#endif /* _WSA881X_H */