On 10/11/17 11:49, Vinod Koul wrote:
A Master registers with SoundWire bus and scans the firmware provided
for device description. In this patch we scan the ACPI namespaces and
create the SoundWire Slave devices based on the ACPI description
Signed-off-by: Sanyog Kale <sanyog.r.kale@xxxxxxxxx>
Signed-off-by: Vinod Koul <vinod.koul@xxxxxxxxx>
---
drivers/soundwire/Makefile | 2 +-
drivers/soundwire/bus.c | 163 +++++++++++++++++++++++++++++++++++++++
drivers/soundwire/bus.h | 20 +++++
drivers/soundwire/slave.c | 172 ++++++++++++++++++++++++++++++++++++++++++
include/linux/soundwire/sdw.h | 11 +++
5 files changed, 367 insertions(+), 1 deletion(-)
create mode 100644 drivers/soundwire/bus.c
create mode 100644 drivers/soundwire/slave.c
diff --git a/drivers/soundwire/Makefile b/drivers/soundwire/Makefile
index d1281def7662..c875e434f8b3 100644
--- a/drivers/soundwire/Makefile
+++ b/drivers/soundwire/Makefile
@@ -3,5 +3,5 @@
#
#Bus Objs
-soundwire-bus-objs := bus_type.o
+soundwire-bus-objs := bus_type.o bus.o slave.o
+
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/pm_runtime.h>
Does this belong to this patch.
+#include <linux/soundwire/sdw.h>
+#include "bus.h"
+
+/**
+ * sdw_add_bus_master: add a bus Master instance
+ *
+ * @bus: bus instance
+ *
+ * Initializes the bus instance, read properties and create child
+ * devices.
+ */
+int sdw_add_bus_master(struct sdw_bus *bus)
+{
+ int ret;
+
+ if (!bus->dev) {
+ pr_err("SoundWire bus has no device");
+ return -ENODEV;
+ }
+
+ mutex_init(&bus->bus_lock);
+ INIT_LIST_HEAD(&bus->slaves);
+
+ /*
+ * Enumeration device number and broadcast device number are
+ * not used for assignment so mask these and other higher bits
+ */
+
+ /* Set higher order bits */
+ *bus->assigned = ~GENMASK(SDW_BROADCAST_DEV_NUM, SDW_ENUM_DEV_NUM);
Can't we use ida for this.
This would also cut down code added for allocating dev_num.
+
+ /* Set device number and broadcast device number */
+ set_bit(SDW_ENUM_DEV_NUM, bus->assigned);
+ set_bit(SDW_BROADCAST_DEV_NUM, bus->assigned);
+ return 0;
+}
+EXPORT_SYMBOL(sdw_add_bus_master);
+
+static int sdw_delete_slave(struct device *dev, void *data)
+{
+ struct sdw_slave *slave = dev_to_sdw_dev(dev);
+ struct sdw_bus *bus = slave->bus;
+
+ mutex_lock(&bus->bus_lock);
+
+ if (slave->dev_num) /* clear dev_num if assigned */
+ clear_bit(slave->dev_num, bus->assigned);
+
+ list_del_init(&slave->node);
+ mutex_unlock(&bus->bus_lock);
+
+ device_unregister(dev);
+ return 0;
+}
+
+void sdw_delete_bus_master(struct sdw_bus *bus)
+{
+ device_for_each_child(bus->dev, NULL, sdw_delete_slave);
+}
+EXPORT_SYMBOL(sdw_delete_bus_master);
No kerneldoc..??
+
diff --git a/drivers/soundwire/slave.c b/drivers/soundwire/slave.c
new file mode 100644
index 000000000000..4bf2a6cf732c
--- /dev/null
+++ b/drivers/soundwire/slave.c
+
+#include <linux/acpi.h>
+#include <linux/init.h>
+#include <linux/soundwire/sdw.h>
+#include "bus.h"
+
+}
+
+static int sdw_slave_add(struct sdw_bus *bus,
+ struct sdw_slave_id *id, struct fwnode_handle *fwnode)
+{
+ struct sdw_slave *slave;
+ int ret;
+
+ slave = kzalloc(sizeof(*slave), GFP_KERNEL);
+ if (!slave)
+ return -ENOMEM;
+
+ /* Initialize data structure */
+ memcpy(&slave->id, id, sizeof(*id));
+ slave->dev.parent = bus->dev;
+ slave->dev.fwnode = fwnode;
+
+ /* name shall be sdw:link:mfg:part:class:unique */
+ dev_set_name(&slave->dev, "sdw:%x:%x:%x:%x:%x",
+ bus->link_id, id->mfg_id, id->part_id,
+ id->class_id, id->unique_id);
+
+ slave->dev.release = sdw_slave_release;
+ slave->dev.bus = &sdw_bus_type;
+ slave->bus = bus;
+ slave->status = SDW_SLAVE_UNATTACHED;
+ slave->dev_num = 0;
+
+ mutex_lock(&bus->bus_lock);
+ list_add_tail(&slave->node, &bus->slaves);
+ mutex_unlock(&bus->bus_lock);
+
+ ret = device_register(&slave->dev);
+ if (ret) {
+ dev_err(bus->dev, "Failed to add slave: ret %d\n", ret);
+
+ /*
+ * On err, don't free but drop ref as this will be freed
+ * when release method is invoked.
+ */
+ mutex_lock(&bus->bus_lock);
+ list_del(&slave->node);
+ mutex_unlock(&bus->bus_lock);
+ put_device(&slave->dev);
+ return ret;
remove this line and ..
+ }
+
+ return 0;
return ret;
+
+#endif
+
+#if IS_ENABLED(CONFIG_OF)
+int sdw_of_find_slaves(struct sdw_bus *bus)
+{
+ /* placeholder now, fill on OF support */
+ return -ENOTSUPP;
+}
+#endif
We should probably remove this dummy function, and add this
functionality later.
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