soundwire: bus: add callbacks for device_number allocation

Rather than add logic in the core for vendor-specific usages, add
callbacks for vendor-specific device_number allocation and release.

This patch only moves the existing IDA-based allocator used only by
Intel to the intel_auxdevice.c file and does not change the
functionality. Follow-up patches will extend the behavior by modifying
the Intel callbacks.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20230731091333.3593132-3-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

2 files changed, 23 insertions, 10 deletions

diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c
index bdd0fed45a8d..0e1e4bedc708 100644
--- a/drivers/soundwire/bus.c
+++ b/drivers/soundwire/bus.c
@@ -12,7 +12,6 @@
 #include "sysfs_local.h"
 
 static DEFINE_IDA(sdw_bus_ida);
-static DEFINE_IDA(sdw_peripheral_ida);
 
 static int sdw_get_id(struct sdw_bus *bus)
 {
@@ -168,8 +167,8 @@ static int sdw_delete_slave(struct device *dev, void *data)
 
 	if (slave->dev_num) { /* clear dev_num if assigned */
 		clear_bit(slave->dev_num, bus->assigned);
-		if (bus->dev_num_ida_min)
-			ida_free(&sdw_peripheral_ida, slave->dev_num);
+		if (bus->ops && bus->ops->put_device_num)
+			bus->ops->put_device_num(bus, slave);
 	}
 	list_del_init(&slave->node);
 	mutex_unlock(&bus->bus_lock);
@@ -710,16 +709,15 @@ EXPORT_SYMBOL(sdw_compare_devid);
 /* called with bus_lock held */
 static int sdw_get_device_num(struct sdw_slave *slave)
 {
+	struct sdw_bus *bus = slave->bus;
 	int bit;
 
-	if (slave->bus->dev_num_ida_min) {
-		bit = ida_alloc_range(&sdw_peripheral_ida,
-				      slave->bus->dev_num_ida_min, SDW_MAX_DEVICES,
-				      GFP_KERNEL);
+	if (bus->ops && bus->ops->get_device_num) {
+		bit = bus->ops->get_device_num(bus, slave);
 		if (bit < 0)
 			goto err;
 	} else {
-		bit = find_first_zero_bit(slave->bus->assigned, SDW_MAX_DEVICES);
+		bit = find_first_zero_bit(bus->assigned, SDW_MAX_DEVICES);
 		if (bit == SDW_MAX_DEVICES) {
 			bit = -ENODEV;
 			goto err;
@@ -730,7 +728,7 @@ static int sdw_get_device_num(struct sdw_slave *slave)
 	 * Do not update dev_num in Slave data structure here,
 	 * Update once program dev_num is successful
 	 */
-	set_bit(bit, slave->bus->assigned);
+	set_bit(bit, bus->assigned);
 
 err:
 	return bit;
diff --git a/drivers/soundwire/intel_auxdevice.c b/drivers/soundwire/intel_auxdevice.c
index 3e7ca4a4964a..65cb3e7b7d25 100644
--- a/drivers/soundwire/intel_auxdevice.c
+++ b/drivers/soundwire/intel_auxdevice.c
@@ -125,6 +125,20 @@ static int intel_prop_read(struct sdw_bus *bus)
 	return 0;
 }
 
+static DEFINE_IDA(intel_peripheral_ida);
+
+static int intel_get_device_num_ida(struct sdw_bus *bus, struct sdw_slave *slave)
+{
+	return ida_alloc_range(&intel_peripheral_ida,
+			       INTEL_DEV_NUM_IDA_MIN, SDW_MAX_DEVICES,
+			       GFP_KERNEL);
+}
+
+static void intel_put_device_num_ida(struct sdw_bus *bus, struct sdw_slave *slave)
+{
+	return ida_free(&intel_peripheral_ida, slave->dev_num);
+}
+
 static struct sdw_master_ops sdw_intel_ops = {
 	.read_prop = intel_prop_read,
 	.override_adr = sdw_dmi_override_adr,
@@ -134,6 +148,8 @@ static struct sdw_master_ops sdw_intel_ops = {
 	.pre_bank_switch = generic_pre_bank_switch,
 	.post_bank_switch = generic_post_bank_switch,
 	.read_ping_status = cdns_read_ping_status,
+	.get_device_num =  intel_get_device_num_ida,
+	.put_device_num = intel_put_device_num_ida,
 	.new_peripheral_assigned = generic_new_peripheral_assigned,
 };
 
@@ -167,7 +183,6 @@ static int intel_link_probe(struct auxiliary_device *auxdev,
 	cdns->msg_count = 0;
 
 	bus->link_id = auxdev->id;
-	bus->dev_num_ida_min = INTEL_DEV_NUM_IDA_MIN;
 	bus->clk_stop_timeout = 1;
 
 	sdw_cdns_probe(cdns);