greybus: audio: Use greybus connection device for codec registration

Use GB Audio mgmt, data protocol ids to register codec module with
GB protocol. And in response to mgmt->connection_init(), register
GB codec driver with ASoC.

Now, using msm8994  machine to register DAI link dynamically on
codec insertion.

ToDos:
- snd_soc_register_codec() uses driver->name to identify device id.
  However, for GB device, .driver{} is not yet populated by GB core.
  Thus, defining dummy structure within codec driver. This should
  come from GB core itself.
  Even existing .driver{} may cause problem in case of multiple
  modules inserted or inserted at a different slot.
- Fix logic for gbcodec->dais & gbcodec->dailinks. Current
  implementation contains some hard coded data with assumption of
  count=1.
- Evaluate definition of 'gbaudio_dailink.be_id' in case of multiple
  DAI links.

Signed-off-by: Vaibhav Agarwal <vaibhav.agarwal@linaro.org>
Signed-off-by: Mark Greer <mgreer@animalcreek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

2 files changed, 432 insertions, 35 deletions

diff --git a/drivers/staging/greybus/audio_codec.c b/drivers/staging/greybus/audio_codec.c
index 826604ae64df..fd94042d3f33 100644
--- a/drivers/staging/greybus/audio_codec.c
+++ b/drivers/staging/greybus/audio_codec.c
@@ -5,10 +5,20 @@
  *
  * Released under the GPLv2 only.
  */
+#include <linux/kernel.h>
 #include <linux/module.h>
+#include <sound/soc.h>
+#include <sound/pcm_params.h>
+#include <sound/msm-dynamic-dailink.h>
 
 #include "audio_codec.h"
 
+#define GB_AUDIO_MGMT_DRIVER_NAME	"gb_audio_mgmt"
+#define GB_AUDIO_DATA_DRIVER_NAME	"gb_audio_data"
+
+static DEFINE_MUTEX(gb_codec_list_lock);
+static LIST_HEAD(gb_codec_list);
+
 static int gbcodec_event_spk(struct snd_soc_dapm_widget *w,
 					struct snd_kcontrol *k, int event)
 {
@@ -190,10 +200,7 @@ static struct snd_soc_dai_driver gbcodec_dai = {
 
 static int gbcodec_probe(struct snd_soc_codec *codec)
 {
-	struct gbaudio_codec_info *gbcodec = snd_soc_codec_get_drvdata(codec);
-
-	gbcodec->codec = codec;
-
+	/* Empty function for now */
 	return 0;
 }
 
@@ -263,53 +270,412 @@ static struct snd_soc_codec_driver soc_codec_dev_gbcodec = {
 	.num_dapm_routes = ARRAY_SIZE(gbcodec_dapm_routes),
 };
 
-static int gbaudio_codec_probe(struct platform_device *pdev)
+/*
+ * GB codec DAI link related
+ */
+static struct snd_soc_dai_link gbaudio_dailink = {
+	.name = "PRI_MI2S_RX",
+	.stream_name = "Primary MI2S Playback",
+	.platform_name = "msm-pcm-routing",
+	.cpu_dai_name = "msm-dai-q6-mi2s.0",
+	.no_pcm = 1,
+	.be_id = 34,
+};
+
+static void gbaudio_remove_dailinks(struct gbaudio_codec_info *gbcodec)
+{
+	int i;
+
+	for (i = 0; i < gbcodec->num_dai_links; i++) {
+		dev_dbg(gbcodec->dev, "Remove %s: DAI link\n",
+			gbcodec->dailink_name[i]);
+		devm_kfree(gbcodec->dev, gbcodec->dailink_name[i]);
+		gbcodec->dailink_name[i] = NULL;
+	}
+	gbcodec->num_dai_links = 0;
+}
+
+static int gbaudio_add_dailinks(struct gbaudio_codec_info *gbcodec)
+{
+	int ret, i;
+	char *dai_link_name;
+	struct snd_soc_dai_link *dai;
+	struct device *dev = gbcodec->dev;
+
+	dai = &gbaudio_dailink;
+	dai->codec_name = gbcodec->name;
+
+	/* FIXME
+	 * allocate memory for DAI links based on count.
+	 * currently num_dai_links=1, so using static struct
+	 */
+	gbcodec->num_dai_links = 1;
+
+	for (i = 0; i < gbcodec->num_dai_links; i++) {
+		gbcodec->dailink_name[i] = dai_link_name =
+			devm_kzalloc(dev, NAME_SIZE, GFP_KERNEL);
+		snprintf(dai_link_name, NAME_SIZE, "GB %d.%d PRI_MI2S_RX",
+			 gbcodec->dev_id, i);
+		dai->name = dai_link_name;
+		dai->codec_dai_name = gbcodec->dais[i].name;
+	}
+
+	ret = msm8994_add_dailink("msm8994-tomtom-mtp-snd-card", dai, 1);
+	if (ret) {
+		dev_err(dev, "%d:Error while adding DAI link\n", ret);
+		goto err_dai_link;
+	}
+
+	return ret;
+
+err_dai_link:
+	gbcodec->num_dai_links = i;
+	gbaudio_remove_dailinks(gbcodec);
+	return ret;
+}
+
+/*
+ * gb_snd management functions
+ */
+static struct gbaudio_codec_info *gbaudio_find_codec(struct device *dev,
+						     int dev_id)
+{
+	struct gbaudio_codec_info *tmp, *ret;
+
+	mutex_lock(&gb_codec_list_lock);
+	list_for_each_entry_safe(ret, tmp, &gb_codec_list, list) {
+		dev_dbg(dev, "%d:device found\n", ret->dev_id);
+		if (ret->dev_id == dev_id) {
+			mutex_unlock(&gb_codec_list_lock);
+			return ret;
+		}
+	}
+	mutex_unlock(&gb_codec_list_lock);
+	return NULL;
+}
+
+static struct gbaudio_codec_info *gbaudio_get_codec(struct device *dev,
+						    int dev_id)
+{
+	struct gbaudio_codec_info *gbcodec;
+
+	gbcodec = gbaudio_find_codec(dev, dev_id);
+	if (gbcodec)
+		return gbcodec;
+
+	gbcodec = devm_kzalloc(dev, sizeof(*gbcodec), GFP_KERNEL);
+	if (!gbcodec)
+		return NULL;
+
+	mutex_init(&gbcodec->lock);
+	INIT_LIST_HEAD(&gbcodec->dai_list);
+	gbcodec->dev_id = dev_id;
+	dev_set_drvdata(dev, gbcodec);
+	gbcodec->dev = dev;
+	strlcpy(gbcodec->name, dev_name(dev), NAME_SIZE);
+
+	mutex_lock(&gb_codec_list_lock);
+	list_add(&gbcodec->list, &gb_codec_list);
+	mutex_unlock(&gb_codec_list_lock);
+	dev_dbg(dev, "%d:%s Added to codec list\n", gbcodec->dev_id,
+		gbcodec->name);
+
+	return gbcodec;
+}
+
+static void gbaudio_free_codec(struct device *dev,
+			       struct gbaudio_codec_info *gbcodec)
+{
+	mutex_lock(&gb_codec_list_lock);
+	if (!gbcodec->mgmt_connection &&
+			list_empty(&gbcodec->dai_list)) {
+		list_del(&gbcodec->list);
+		mutex_unlock(&gb_codec_list_lock);
+		dev_set_drvdata(dev, NULL);
+		devm_kfree(dev, gbcodec);
+	} else {
+		mutex_unlock(&gb_codec_list_lock);
+	}
+}
+
+/*
+ * This is the basic hook get things initialized and registered w/ gb
+ */
+
+/*
+ * GB codec module driver ops
+ */
+struct device_driver gb_codec_driver = {
+	.name = "1-8",
+	.owner = THIS_MODULE,
+};
+
+static int gbaudio_codec_probe(struct gb_connection *connection)
 {
 	int ret;
 	struct gbaudio_codec_info *gbcodec;
-	char dai_name[NAME_SIZE];
+	struct device *dev = &connection->bundle->dev;
+	int dev_id = connection->bundle->id;
 
-	gbcodec = devm_kzalloc(&pdev->dev, sizeof(struct gbaudio_codec_info),
-			       GFP_KERNEL);
+	dev_dbg(dev, "Add device:%d:%s\n", dev_id, dev_name(dev));
+	/* get gbcodec data */
+	gbcodec = gbaudio_get_codec(dev, dev_id);
 	if (!gbcodec)
 		return -ENOMEM;
-	platform_set_drvdata(pdev, gbcodec);
 
-	snprintf(dai_name, NAME_SIZE, "%s.%d", "gbcodec_pcm", pdev->id);
-	gbcodec_dai.name = dai_name;
+	gbcodec->mgmt_connection = connection;
+
+	/* update DAI info */
+	gbcodec->dais = &gbcodec_dai;
+	/* FIXME */
+	dev->driver = &gb_codec_driver;
+
+	/* register codec */
+	ret = snd_soc_register_codec(dev, &soc_codec_dev_gbcodec,
+				     gbcodec->dais, 1);
+	if (ret) {
+		dev_err(dev, "%d:Failed to register codec\n", ret);
+		goto base_error;
+	}
+
+	/* update DAI links in response to this codec */
+	ret = gbaudio_add_dailinks(gbcodec);
+	if (ret) {
+		dev_err(dev, "%d: Failed to add DAI links\n", ret);
+		goto codec_reg_error;
+	}
+
+	/* set registered flag */
+	mutex_lock(&gbcodec->lock);
+	gbcodec->codec_registered = 1;
 
-	ret = snd_soc_register_codec(&pdev->dev, &soc_codec_dev_gbcodec,
-				     &gbcodec_dai, 1);
-	if (!ret)
-		gbcodec->registered = 1;
+	mutex_unlock(&gbcodec->lock);
 
 	return ret;
+
+codec_reg_error:
+	snd_soc_unregister_codec(dev);
+base_error:
+	dev->driver = NULL;
+	gbcodec->mgmt_connection = NULL;
+	return ret;
 }
 
-static const struct of_device_id gbcodec_of_match[] = {
-	{ .compatible = "greybus,codec", },
-	{},
+static void gbaudio_codec_remove(struct gb_connection *connection)
+{
+	struct gbaudio_codec_info *gbcodec;
+	struct device *dev = &connection->bundle->dev;
+	int dev_id = connection->bundle->id;
+
+	dev_dbg(dev, "Remove device:%d:%s\n", dev_id, dev_name(dev));
+
+	/* get gbcodec data */
+	gbcodec = gbaudio_find_codec(dev, dev_id);
+	if (!gbcodec)
+		return;
+
+	msm8994_remove_dailink("msm8994-tomtom-mtp-snd-card", &gbaudio_dailink,
+			       1);
+	gbaudio_remove_dailinks(gbcodec);
+
+	snd_soc_unregister_codec(dev);
+	dev->driver = NULL;
+	gbcodec->mgmt_connection = NULL;
+	mutex_lock(&gbcodec->lock);
+	gbcodec->codec_registered = 0;
+	mutex_unlock(&gbcodec->lock);
+	gbaudio_free_codec(dev, gbcodec);
+}
+
+static int gbaudio_codec_report_event_recv(u8 type, struct gb_operation *op)
+{
+	struct gb_connection *connection = op->connection;
+	struct gb_audio_streaming_event_request *req = op->request->payload;
+
+	dev_warn(&connection->bundle->dev,
+		 "Audio Event received: cport: %u, event: %u\n",
+		 req->data_cport, req->event);
+
+	return 0;
+}
+
+static struct gb_protocol gb_audio_mgmt_protocol = {
+	.name			= GB_AUDIO_MGMT_DRIVER_NAME,
+	.id			= GREYBUS_PROTOCOL_AUDIO_MGMT,
+	.major			= 0,
+	.minor			= 1,
+	.connection_init	= gbaudio_codec_probe,
+	.connection_exit	= gbaudio_codec_remove,
+	.request_recv		= gbaudio_codec_report_event_recv,
 };
 
-static int gbaudio_codec_remove(struct platform_device *pdev)
+static struct gbaudio_dai *gbaudio_allocate_dai(struct gbaudio_codec_info *gb,
+					 int data_cport,
+					 struct gb_connection *connection,
+					 const char *name)
+{
+	struct gbaudio_dai *dai;
+
+	mutex_lock(&gb->lock);
+	dai = devm_kzalloc(gb->dev, sizeof(*dai), GFP_KERNEL);
+	if (!dai) {
+		dev_err(gb->dev, "%s:DAI Malloc failure\n", name);
+		mutex_unlock(&gb->lock);
+		return NULL;
+	}
+
+	dai->data_cport = data_cport;
+	dai->connection = connection;
+
+	/* update name */
+	if (name)
+		strlcpy(dai->name, name, NAME_SIZE);
+	list_add(&dai->list, &gb->dai_list);
+	dev_dbg(gb->dev, "%d:%s: DAI added\n", data_cport, dai->name);
+	mutex_unlock(&gb->lock);
+
+	return dai;
+}
+
+struct gbaudio_dai *gbaudio_add_dai(struct gbaudio_codec_info *gbcodec,
+				    int data_cport,
+				    struct gb_connection *connection,
+				    const char *name)
+{
+	struct gbaudio_dai *dai, *_dai;
+
+	/* FIXME need to take care for multiple DAIs */
+	mutex_lock(&gbcodec->lock);
+	if (list_empty(&gbcodec->dai_list)) {
+		mutex_unlock(&gbcodec->lock);
+		return gbaudio_allocate_dai(gbcodec, data_cport, connection,
+					    name);
+	}
+
+	list_for_each_entry_safe(dai, _dai, &gbcodec->dai_list, list) {
+		if (dai->data_cport == data_cport) {
+			if (connection)
+				dai->connection = connection;
+
+			if (name)
+				strlcpy(dai->name, name, NAME_SIZE);
+			dev_dbg(gbcodec->dev, "%d:%s: DAI updated\n",
+				data_cport, dai->name);
+			mutex_unlock(&gbcodec->lock);
+			return dai;
+		}
+	}
+
+	dev_err(gbcodec->dev, "%s:DAI not found\n", name);
+	mutex_unlock(&gbcodec->lock);
+	return NULL;
+}
+
+static int gbaudio_dai_probe(struct gb_connection *connection)
 {
-	snd_soc_unregister_codec(&pdev->dev);
+	struct gbaudio_dai *dai;
+	struct device *dev = &connection->bundle->dev;
+	int dev_id = connection->bundle->id;
+	struct gbaudio_codec_info *gbcodec = dev_get_drvdata(dev);
+
+	dev_dbg(dev, "Add DAI device:%d:%s\n", dev_id, dev_name(dev));
+
+	/* get gbcodec data */
+	gbcodec = gbaudio_get_codec(dev, dev_id);
+	if (!gbcodec)
+		return -ENOMEM;
+
+	/* add/update dai_list*/
+	dai = gbaudio_add_dai(gbcodec, connection->intf_cport_id, connection,
+			       NULL);
+	if (!dai)
+		return -ENOMEM;
+
+	/* update dai_added count */
+	mutex_lock(&gbcodec->lock);
+	gbcodec->dai_added++;
+	mutex_unlock(&gbcodec->lock);
 
 	return 0;
 }
 
-static struct platform_driver gbaudio_codec_driver = {
-	.driver = {
-		.name = "gbaudio-codec",
-		.owner = THIS_MODULE,
-		.of_match_table = gbcodec_of_match,
-	},
-	.probe = gbaudio_codec_probe,
-	.remove   = gbaudio_codec_remove,
+static void gbaudio_dai_remove(struct gb_connection *connection)
+{
+	struct device *dev = &connection->bundle->dev;
+	int dev_id = connection->bundle->id;
+	struct gbaudio_codec_info *gbcodec;
+
+	dev_dbg(dev, "Remove DAI device:%d:%s\n", dev_id, dev_name(dev));
+
+	/* get gbcodec data */
+	gbcodec = gbaudio_find_codec(dev, dev_id);
+	if (!gbcodec)
+		return;
+
+	/* inform uevent to above layers */
+	mutex_lock(&gbcodec->lock);
+	/* update dai_added count */
+	gbcodec->dai_added--;
+	mutex_unlock(&gbcodec->lock);
+
+	gbaudio_free_codec(dev, gbcodec);
+}
+
+static int gbaudio_dai_report_event_recv(u8 type, struct gb_operation *op)
+{
+	struct gb_connection *connection = op->connection;
+
+	dev_warn(&connection->bundle->dev, "Audio Event received\n");
+
+	return 0;
+}
+
+static struct gb_protocol gb_audio_data_protocol = {
+	.name			= GB_AUDIO_DATA_DRIVER_NAME,
+	.id			= GREYBUS_PROTOCOL_AUDIO_DATA,
+	.major			= 0,
+	.minor			= 1,
+	.connection_init	= gbaudio_dai_probe,
+	.connection_exit	= gbaudio_dai_remove,
+	.request_recv		= gbaudio_dai_report_event_recv,
 };
-module_platform_driver(gbaudio_codec_driver);
 
-MODULE_DESCRIPTION("Greybus Audio virtual codec driver");
+/*
+ * This is the basic hook get things initialized and registered w/ gb
+ */
+
+static int __init gb_audio_protocol_init(void)
+{
+	int err;
+
+	err = gb_protocol_register(&gb_audio_mgmt_protocol);
+	if (err) {
+		pr_err("Can't register i2s mgmt protocol driver: %d\n", -err);
+		return err;
+	}
+
+	err = gb_protocol_register(&gb_audio_data_protocol);
+	if (err) {
+		pr_err("Can't register Audio protocol driver: %d\n", -err);
+		goto err_unregister_audio_mgmt;
+	}
+
+	return 0;
+
+err_unregister_audio_mgmt:
+	gb_protocol_deregister(&gb_audio_mgmt_protocol);
+	return err;
+}
+module_init(gb_audio_protocol_init);
+
+static void __exit gb_audio_protocol_exit(void)
+{
+	gb_protocol_deregister(&gb_audio_data_protocol);
+	gb_protocol_deregister(&gb_audio_mgmt_protocol);
+}
+module_exit(gb_audio_protocol_exit);
+
+MODULE_DESCRIPTION("Greybus Audio codec driver");
 MODULE_AUTHOR("Vaibhav Agarwal <vaibhav.agarwal@linaro.org>");
 MODULE_LICENSE("GPL v2");
 MODULE_ALIAS("platform:gbaudio-codec");
diff --git a/drivers/staging/greybus/audio_codec.h b/drivers/staging/greybus/audio_codec.h
index f8597b3de808..39bd995719c2 100644
--- a/drivers/staging/greybus/audio_codec.h
+++ b/drivers/staging/greybus/audio_codec.h
@@ -15,6 +15,7 @@
 #include "greybus_protocols.h"
 
 #define NAME_SIZE	32
+#define MAX_DAIS	2	/* APB1, APB2 */
 
 enum {
 	APB1_PCM = 0,
@@ -67,24 +68,54 @@ static const u8 gbcodec_reg_defaults[GBCODEC_REG_COUNT] = {
 	GBCODEC_APB2_MUX_REG_DEFAULT,
 };
 
+struct gbaudio_dai {
+	__le16 data_cport;
+	char name[NAME_SIZE];
+	struct gb_connection *connection;
+	struct list_head list;
+};
+
 struct gbaudio_codec_info {
+	/* module info */
+	int dev_id;	/* check if it should be bundle_id/hd_cport_id */
+	int vid;
+	int pid;
+	int slot;
+	int type;
+	int dai_added;
+	int codec_registered;
+	char vstr[NAME_SIZE];
+	char pstr[NAME_SIZE];
+	struct list_head list;
+	char name[NAME_SIZE];
+
+	/* soc related data */
 	struct snd_soc_codec *codec;
-
-	bool usable;
+	struct device *dev;
 	u8 reg[GBCODEC_REG_COUNT];
-	int registered;
 
+	/* dai_link related */
+	char card_name[NAME_SIZE];
+	char *dailink_name[MAX_DAIS];
+	int num_dai_links;
+
+	/* topology related */
+	struct gb_connection *mgmt_connection;
+	int num_dais;
 	int num_kcontrols;
 	int num_dapm_widgets;
 	int num_dapm_routes;
 	struct snd_kcontrol_new *kctls;
 	struct snd_soc_dapm_widget *widgets;
 	struct snd_soc_dapm_route *routes;
+	struct snd_soc_dai_driver *dais;
+
+	/* lists */
+	struct list_head dai_list;
 	struct mutex lock;
 };
 
-extern int gb_audio_gb_get_topology(struct gb_connection *connection,
-				    struct gb_audio_topology **topology);
+/* protocol related */
 extern int gb_audio_gb_get_control(struct gb_connection *connection,
 				   uint8_t control_id, uint8_t index,
 				   struct gb_audio_ctl_elem_value *value);