[PATCH V4 04/13] soundwire: amd: implement function to extract slave information

[Vijendar Mukunda <Vijendar.Mukunda@xxxxxxx>]

Implement function to extract slaves information connected on the bus.
This information is required during machine select logic.
This function will be called from machine select logic code.

Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@xxxxxxx>
---
 drivers/soundwire/amd_init.c      | 43 +++++++++++++++++++++++++++++++
 include/linux/soundwire/sdw_amd.h |  2 ++
 2 files changed, 45 insertions(+)

diff --git a/drivers/soundwire/amd_init.c b/drivers/soundwire/amd_init.c
index 699391d9acba..46a0538d7fc7 100644
--- a/drivers/soundwire/amd_init.c
+++ b/drivers/soundwire/amd_init.c
@@ -142,6 +142,49 @@ void sdw_amd_exit(struct sdw_amd_ctx *ctx)
 }
 EXPORT_SYMBOL_NS(sdw_amd_exit, SOUNDWIRE_AMD_INIT);
 
+int sdw_amd_get_slave_info(struct sdw_amd_ctx *ctx)
+{
+	struct amd_sdw_manager *amd_manager;
+	struct sdw_bus *bus;
+	struct sdw_slave *slave;
+	struct list_head *node;
+	int index;
+	int i = 0;
+	int num_slaves = 0;
+
+	for (index = 0; index < ctx->count; index++) {
+		if (!(ctx->link_mask & BIT(index)))
+			continue;
+		amd_manager = dev_get_drvdata(&ctx->pdev[index]->dev);
+		if (!amd_manager)
+			return -ENODEV;
+		bus = &amd_manager->bus;
+		/* Calculate number of slaves */
+		list_for_each(node, &bus->slaves)
+			num_slaves++;
+	}
+
+	ctx->ids = kcalloc(num_slaves, sizeof(*ctx->ids), GFP_KERNEL);
+	if (!ctx->ids)
+		return -ENOMEM;
+	ctx->num_slaves = num_slaves;
+	for (index = 0; index < ctx->count; index++) {
+		if (!(ctx->link_mask & BIT(index)))
+			continue;
+		amd_manager = dev_get_drvdata(&ctx->pdev[index]->dev);
+		if (amd_manager) {
+			bus = &amd_manager->bus;
+			list_for_each_entry(slave, &bus->slaves, node) {
+				ctx->ids[i].id = slave->id;
+				ctx->ids[i].link_id = bus->link_id;
+				i++;
+			}
+		}
+	}
+	return 0;
+}
+EXPORT_SYMBOL_NS(sdw_amd_get_slave_info, SOUNDWIRE_AMD_INIT);
+
 MODULE_AUTHOR("Vijendar.Mukunda@xxxxxxx");
 MODULE_DESCRIPTION("AMD SoundWire Init Library");
 MODULE_LICENSE("Dual BSD/GPL");
diff --git a/include/linux/soundwire/sdw_amd.h b/include/linux/soundwire/sdw_amd.h
index 54735fa49759..9103772c2497 100644
--- a/include/linux/soundwire/sdw_amd.h
+++ b/include/linux/soundwire/sdw_amd.h
@@ -170,5 +170,7 @@ int sdw_amd_probe(struct sdw_amd_res *res, struct sdw_amd_ctx **ctx);
 
 void sdw_amd_exit(struct sdw_amd_ctx *ctx);
 
+int sdw_amd_get_slave_info(struct sdw_amd_ctx *ctx);
+
 int amd_sdw_scan_controller(struct sdw_amd_acpi_info *info);
 #endif
-- 
2.34.1