soundwire: extend SDW_SLAVE_ENTRY

The SoundWire 1.2 specification adds new capabilities that were not
present in previous version, such as the class ID.

To enable support for class drivers, and well as drivers that address
a specific version, all fields of the sdw_device_id structure need to
be exposed. For SoundWire 1.0 and 1.1 devices, a wildcard is used so
class and version information are ignored.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Rander Wang <rander.wang@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20200608205436.2402-4-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/soundwire/bus_type.c

@@ -24,7 +24,11 @@ sdw_get_device_id(struct sdw_slave *slave, struct sdw_driver *drv)
 
 	for (id = drv->id_table; id && id->mfg_id; id++)
 		if (slave->id.mfg_id == id->mfg_id &&
-		    slave->id.part_id == id->part_id)
+		    slave->id.part_id == id->part_id  &&
+		    (!id->sdw_version ||
+		     slave->id.sdw_version == id->sdw_version) &&
+		    (!id->class_id ||
+		     slave->id.class_id == id->class_id))
 			return id;
 
 	return NULL;
@@ -47,10 +51,11 @@ static int sdw_bus_match(struct device *dev, struct device_driver *ddrv)
 
 int sdw_slave_modalias(const struct sdw_slave *slave, char *buf, size_t size)
 {
-	/* modalias is sdw:m<mfg_id>p<part_id> */
+	/* modalias is sdw:m<mfg_id>p<part_id>v<version>c<class_id> */
 
-	return snprintf(buf, size, "sdw:m%04Xp%04X\n",
-			slave->id.mfg_id, slave->id.part_id);
+	return snprintf(buf, size, "sdw:m%04Xp%04Xv%02Xc%02X\n",
+			slave->id.mfg_id, slave->id.part_id,
+			slave->id.sdw_version, slave->id.class_id);
 }
 
 int sdw_slave_uevent(struct device *dev, struct kobj_uevent_env *env)

include/linux/mod_devicetable.h

@@ -251,6 +251,8 @@ struct hda_device_id {
 struct sdw_device_id {
 	__u16 mfg_id;
 	__u16 part_id;
+	__u8  sdw_version;
+	__u8  class_id;
 	kernel_ulong_t driver_data;
 };
 

include/linux/soundwire/sdw.h

@@ -426,8 +426,7 @@ int sdw_slave_read_prop(struct sdw_slave *slave);
  * struct sdw_slave_id - Slave ID
  * @mfg_id: MIPI Manufacturer ID
  * @part_id: Device Part ID
- * @class_id: MIPI Class ID, unused now.
- * Currently a placeholder in MIPI SoundWire Spec
+ * @class_id: MIPI Class ID (defined starting with SoundWire 1.2 spec)
  * @unique_id: Device unique ID
  * @sdw_version: SDW version implemented
  *
@@ -659,10 +658,14 @@ struct sdw_driver {
 	struct device_driver driver;
 };
 
-#define SDW_SLAVE_ENTRY(_mfg_id, _part_id, _drv_data) \
-	{ .mfg_id = (_mfg_id), .part_id = (_part_id), \
+#define SDW_SLAVE_ENTRY_EXT(_mfg_id, _part_id, _version, _c_id, _drv_data) \
+	{ .mfg_id = (_mfg_id), .part_id = (_part_id),		\
+	  .sdw_version = (_version), .class_id = (_c_id),	\
 	  .driver_data = (unsigned long)(_drv_data) }
 
+#define SDW_SLAVE_ENTRY(_mfg_id, _part_id, _drv_data)	\
+	SDW_SLAVE_ENTRY_EXT((_mfg_id), (_part_id), 0, 0, (_drv_data))
+
 int sdw_handle_slave_status(struct sdw_bus *bus,
 			enum sdw_slave_status status[]);
 

scripts/mod/devicetable-offsets.c

@@ -216,6 +216,8 @@ int main(void)
 	DEVID(sdw_device_id);
 	DEVID_FIELD(sdw_device_id, mfg_id);
 	DEVID_FIELD(sdw_device_id, part_id);
+	DEVID_FIELD(sdw_device_id, sdw_version);
+	DEVID_FIELD(sdw_device_id, class_id);
 
 	DEVID(fsl_mc_device_id);
 	DEVID_FIELD(fsl_mc_device_id, vendor);

scripts/mod/file2alias.c

@@ -1258,15 +1258,19 @@ static int do_hda_entry(const char *filename, void *symval, char *alias)
 	return 1;
 }
 
-/* Looks like: sdw:mNpN */
+/* Looks like: sdw:mNpNvNcN */
 static int do_sdw_entry(const char *filename, void *symval, char *alias)
 {
 	DEF_FIELD(symval, sdw_device_id, mfg_id);
 	DEF_FIELD(symval, sdw_device_id, part_id);
+	DEF_FIELD(symval, sdw_device_id, sdw_version);
+	DEF_FIELD(symval, sdw_device_id, class_id);
 
 	strcpy(alias, "sdw:");
 	ADD(alias, "m", mfg_id != 0, mfg_id);
 	ADD(alias, "p", part_id != 0, part_id);
+	ADD(alias, "v", sdw_version != 0, sdw_version);
+	ADD(alias, "c", class_id != 0, class_id);
 
 	add_wildcard(alias);
 	return 1;