From dbb50c7a9949506f750d59d9ba4d58f0ce8ccd42 Mon Sep 17 00:00:00 2001 From: Bard Liao Date: Tue, 19 May 2020 01:43:20 +0800 Subject: soundwire: bus: add unique bus id Adding an unique id for each bus. Suggested-by: Vinod Koul Signed-off-by: Bard Liao Acked-by: Jaroslav Kysela Link: https://lore.kernel.org/r/20200518174322.31561-4-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul --- drivers/soundwire/bus.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'drivers/soundwire/bus.c') diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index a8072791d6b8..03d72fa3c190 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -9,6 +9,19 @@ #include #include "bus.h" +static DEFINE_IDA(sdw_ida); + +static int sdw_get_id(struct sdw_bus *bus) +{ + int rc = ida_alloc(&sdw_ida, GFP_KERNEL); + + if (rc < 0) + return rc; + + bus->id = rc; + return 0; +} + /** * sdw_bus_master_add() - add a bus Master instance * @bus: bus instance @@ -29,6 +42,12 @@ int sdw_bus_master_add(struct sdw_bus *bus, struct device *parent, return -ENODEV; } + ret = sdw_get_id(bus); + if (ret) { + dev_err(bus->dev, "Failed to get bus id\n"); + return ret; + } + if (!bus->ops) { dev_err(bus->dev, "SoundWire Bus ops are not set\n"); return -EINVAL; @@ -144,6 +163,7 @@ void sdw_bus_master_delete(struct sdw_bus *bus) device_for_each_child(bus->dev, NULL, sdw_delete_slave); sdw_bus_debugfs_exit(bus); + ida_free(&sdw_ida, bus->id); } EXPORT_SYMBOL(sdw_bus_master_delete); -- cgit v1.2.3