greybus: audio: Add Greybus Audio Device Class Protocol helper routines

Add helper routines to make communicating with audio modules easier.
Signed-off-by: Mark Greer <mgreer@animalcreek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/Makefile

@@ -30,6 +30,7 @@ gb-hid-y := hid.o
 gb-es2-y := es2.o
 gb-arche-y := arche-platform.o arche-apb-ctrl.o
 gb-audio-codec-y := audio_codec.o
+gb-audio-gb-y := audio_gb.o
 gb-camera-y := camera.o
 
 obj-m += greybus.o
@@ -44,6 +45,7 @@ obj-m += gb-es2.o
 obj-m += gb-arche.o
 obj-m += gb-audio-codec.o
 obj-m += gb-camera.o
+obj-m += gb-audio-gb.o
 
 KERNELVER		?= $(shell uname -r)
 KERNELDIR 		?= /lib/modules/$(KERNELVER)/build

drivers/staging/greybus/audio.h

@@ -13,6 +13,9 @@
 
 #include <sound/soc.h>
 
+#include "greybus.h"
+#include "greybus_protocols.h"
+
 #define NAME_SIZE	32
 
 enum {
@@ -82,5 +85,42 @@ struct gbaudio_codec_info {
 	struct mutex lock;
 };
 
+extern int gb_audio_gb_get_topology(struct gb_connection *connection,
+				    struct gb_audio_topology **topology);
+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);
+extern int gb_audio_gb_set_control(struct gb_connection *connection,
+				   uint8_t control_id, uint8_t index,
+				   struct gb_audio_ctl_elem_value *value);
+extern int gb_audio_gb_enable_widget(struct gb_connection *connection,
+				     uint8_t widget_id);
+extern int gb_audio_gb_disable_widget(struct gb_connection *connection,
+				      uint8_t widget_id);
+extern int gb_audio_gb_get_pcm(struct gb_connection *connection,
+			       uint16_t data_cport, uint32_t *format,
+			       uint32_t *rate, uint8_t *channels,
+			       uint8_t *sig_bits);
+extern int gb_audio_gb_set_pcm(struct gb_connection *connection,
+			       uint16_t data_cport, uint32_t format,
+			       uint32_t rate, uint8_t channels,
+			       uint8_t sig_bits);
+extern int gb_audio_gb_set_tx_data_size(struct gb_connection *connection,
+					uint16_t data_cport, uint16_t size);
+extern int gb_audio_gb_get_tx_delay(struct gb_connection *connection,
+				    uint16_t data_cport, uint32_t *delay);
+extern int gb_audio_gb_activate_tx(struct gb_connection *connection,
+				   uint16_t data_cport);
+extern int gb_audio_gb_deactivate_tx(struct gb_connection *connection,
+				     uint16_t data_cport);
+extern int gb_audio_gb_set_rx_data_size(struct gb_connection *connection,
+					uint16_t data_cport, uint16_t size);
+extern int gb_audio_gb_get_rx_delay(struct gb_connection *connection,
+				    uint16_t data_cport, uint32_t *delay);
+extern int gb_audio_gb_activate_rx(struct gb_connection *connection,
+				   uint16_t data_cport);
+extern int gb_audio_gb_deactivate_rx(struct gb_connection *connection,
+				     uint16_t data_cport);
+
 #endif /* __KERNEL__ */
 #endif /* __LINUX_GBAUDIO_H */

drivers/staging/greybus/audio_gb.c

+/*
+ * Greybus Audio Device Class Protocol helpers
+ *
+ * Copyright 2015-2016 Google Inc.
+ *
+ * Released under the GPLv2 only.
+ */
+
+#include "greybus.h"
+#include "greybus_protocols.h"
+#include "operation.h"
+
+/* TODO: Split into separate calls */
+int gb_audio_gb_get_topology(struct gb_connection *connection,
+			     struct gb_audio_topology **topology)
+{
+	struct gb_audio_get_topology_size_response size_resp;
+	struct gb_audio_topology *topo;
+	uint16_t size;
+	int ret;
+
+	ret = gb_operation_sync(connection, GB_AUDIO_TYPE_GET_TOPOLOGY_SIZE,
+				NULL, 0, &size_resp, sizeof(size_resp));
+	if (ret)
+		return ret;
+
+	size = le16_to_cpu(size_resp.size);
+	if (size < sizeof(*topo))
+		return -ENODATA;
+
+	topo = kzalloc(size, GFP_KERNEL);
+	if (!topo)
+		return -ENOMEM;
+
+	ret = gb_operation_sync(connection, GB_AUDIO_TYPE_GET_TOPOLOGY, NULL, 0,
+				topo, size);
+	if (ret) {
+		kfree(topo);
+		return ret;
+	}
+
+	*topology = topo;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(gb_audio_gb_get_topology);
+
+int gb_audio_gb_get_control(struct gb_connection *connection,
+			    uint8_t control_id, uint8_t index,
+			    struct gb_audio_ctl_elem_value *value)
+{
+	struct gb_audio_get_control_request req;
+	struct gb_audio_get_control_response resp;
+	int ret;
+
+	req.control_id = control_id;
+	req.index = index;
+
+	ret = gb_operation_sync(connection, GB_AUDIO_TYPE_GET_CONTROL,
+				&req, sizeof(req), &resp, sizeof(resp));
+	if (ret)
+		return ret;
+
+	memcpy(value, &resp.value, sizeof(*value));
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(gb_audio_gb_get_control);
+
+int gb_audio_gb_set_control(struct gb_connection *connection,
+			    uint8_t control_id, uint8_t index,
+			    struct gb_audio_ctl_elem_value *value)
+{
+	struct gb_audio_set_control_request req;
+
+	req.control_id = control_id;
+	req.index = index;
+	memcpy(&req.value, value, sizeof(req.value));
+
+	return gb_operation_sync(connection, GB_AUDIO_TYPE_SET_CONTROL,
+				 &req, sizeof(req), NULL, 0);
+}
+EXPORT_SYMBOL_GPL(gb_audio_gb_set_control);
+
+int gb_audio_gb_enable_widget(struct gb_connection *connection,
+			      uint8_t widget_id)
+{
+	struct gb_audio_enable_widget_request req;
+
+	req.widget_id = widget_id;
+
+	return gb_operation_sync(connection, GB_AUDIO_TYPE_ENABLE_WIDGET,
+				 &req, sizeof(req), NULL, 0);
+}
+EXPORT_SYMBOL_GPL(gb_audio_gb_enable_widget);
+
+int gb_audio_gb_disable_widget(struct gb_connection *connection,
+			       uint8_t widget_id)
+{
+	struct gb_audio_disable_widget_request req;
+
+	req.widget_id = widget_id;
+
+	return gb_operation_sync(connection, GB_AUDIO_TYPE_DISABLE_WIDGET,
+				 &req, sizeof(req), NULL, 0);
+}
+EXPORT_SYMBOL_GPL(gb_audio_gb_disable_widget);
+
+int gb_audio_gb_get_pcm(struct gb_connection *connection, uint16_t data_cport,
+			uint32_t *format, uint32_t *rate, uint8_t *channels,
+			uint8_t *sig_bits)
+{
+	struct gb_audio_get_pcm_request req;
+	struct gb_audio_get_pcm_response resp;
+	int ret;
+
+	req.data_cport = cpu_to_le16(data_cport);
+
+	ret = gb_operation_sync(connection, GB_AUDIO_TYPE_GET_PCM,
+				&req, sizeof(req), &resp, sizeof(resp));
+	if (ret)
+		return ret;
+
+	*format = le32_to_cpu(resp.format);
+	*rate = le32_to_cpu(resp.rate);
+	*channels = resp.channels;
+	*sig_bits = resp.sig_bits;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(gb_audio_gb_get_pcm);
+
+int gb_audio_gb_set_pcm(struct gb_connection *connection, uint16_t data_cport,
+			uint32_t format, uint32_t rate, uint8_t channels,
+			uint8_t sig_bits)
+{
+	struct gb_audio_set_pcm_request req;
+
+	req.data_cport = cpu_to_le16(data_cport);
+	req.format = cpu_to_le32(format);
+	req.rate = cpu_to_le32(rate);
+	req.channels = channels;
+	req.sig_bits = sig_bits;
+
+	return gb_operation_sync(connection, GB_AUDIO_TYPE_SET_PCM,
+				 &req, sizeof(req), NULL, 0);
+}
+EXPORT_SYMBOL_GPL(gb_audio_gb_set_pcm);
+
+int gb_audio_gb_set_tx_data_size(struct gb_connection *connection,
+				 uint16_t data_cport, uint16_t size)
+{
+	struct gb_audio_set_tx_data_size_request req;
+
+	req.data_cport = cpu_to_le16(data_cport);
+	req.size = cpu_to_le16(size);
+
+	return gb_operation_sync(connection, GB_AUDIO_TYPE_SET_TX_DATA_SIZE,
+				 &req, sizeof(req), NULL, 0);
+}
+EXPORT_SYMBOL_GPL(gb_audio_gb_set_tx_data_size);
+
+int gb_audio_gb_get_tx_delay(struct gb_connection *connection,
+			     uint16_t data_cport, uint32_t *delay)
+{
+	struct gb_audio_get_tx_delay_request req;
+	struct gb_audio_get_tx_delay_response resp;
+	int ret;
+
+	req.data_cport = cpu_to_le16(data_cport);
+
+	ret = gb_operation_sync(connection, GB_AUDIO_TYPE_GET_TX_DELAY,
+				&req, sizeof(req), &resp, sizeof(resp));
+	if (ret)
+		return ret;
+
+	*delay = le32_to_cpu(resp.delay);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(gb_audio_gb_get_tx_delay);
+
+int gb_audio_gb_activate_tx(struct gb_connection *connection,
+			    uint16_t data_cport)
+{
+	struct gb_audio_activate_tx_request req;
+
+	req.data_cport = cpu_to_le16(data_cport);
+
+	return gb_operation_sync(connection, GB_AUDIO_TYPE_ACTIVATE_TX,
+				 &req, sizeof(req), NULL, 0);
+}
+EXPORT_SYMBOL_GPL(gb_audio_gb_activate_tx);
+
+int gb_audio_gb_deactivate_tx(struct gb_connection *connection,
+			      uint16_t data_cport)
+{
+	struct gb_audio_deactivate_tx_request req;
+
+	req.data_cport = cpu_to_le16(data_cport);
+
+	return gb_operation_sync(connection, GB_AUDIO_TYPE_DEACTIVATE_TX,
+				 &req, sizeof(req), NULL, 0);
+}
+EXPORT_SYMBOL_GPL(gb_audio_gb_deactivate_tx);
+
+int gb_audio_gb_set_rx_data_size(struct gb_connection *connection,
+				 uint16_t data_cport, uint16_t size)
+{
+	struct gb_audio_set_rx_data_size_request req;
+
+	req.data_cport = cpu_to_le16(data_cport);
+	req.size = cpu_to_le16(size);
+
+	return gb_operation_sync(connection, GB_AUDIO_TYPE_SET_RX_DATA_SIZE,
+				 &req, sizeof(req), NULL, 0);
+}
+EXPORT_SYMBOL_GPL(gb_audio_gb_set_rx_data_size);
+
+int gb_audio_gb_get_rx_delay(struct gb_connection *connection,
+			     uint16_t data_cport, uint32_t *delay)
+{
+	struct gb_audio_get_rx_delay_request req;
+	struct gb_audio_get_rx_delay_response resp;
+	int ret;
+
+	req.data_cport = cpu_to_le16(data_cport);
+
+	ret = gb_operation_sync(connection, GB_AUDIO_TYPE_GET_RX_DELAY,
+				&req, sizeof(req), &resp, sizeof(resp));
+	if (ret)
+		return ret;
+
+	*delay = le32_to_cpu(resp.delay);
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(gb_audio_gb_get_rx_delay);
+
+int gb_audio_gb_activate_rx(struct gb_connection *connection,
+			    uint16_t data_cport)
+{
+	struct gb_audio_activate_rx_request req;
+
+	req.data_cport = cpu_to_le16(data_cport);
+
+	return gb_operation_sync(connection, GB_AUDIO_TYPE_ACTIVATE_RX,
+				 &req, sizeof(req), NULL, 0);
+}
+EXPORT_SYMBOL_GPL(gb_audio_gb_activate_rx);
+
+int gb_audio_gb_deactivate_rx(struct gb_connection *connection,
+			      uint16_t data_cport)
+{
+	struct gb_audio_deactivate_rx_request req;
+
+	req.data_cport = cpu_to_le16(data_cport);
+
+	return gb_operation_sync(connection, GB_AUDIO_TYPE_DEACTIVATE_RX,
+				 &req, sizeof(req), NULL, 0);
+}
+EXPORT_SYMBOL_GPL(gb_audio_gb_deactivate_rx);
+
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("greybus:audio-gb");
+MODULE_DESCRIPTION("Greybus Audio Device Class Protocol library");
+MODULE_AUTHOR("Mark Greer <mgreer@animalcreek.com>");