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Subject[PATCH v5 08/17] soundwire: add initial definitions for sdw_master_device
Date
Since we want an explicit support for the SoundWire Master device, add
the definitions, following the Greybus example of a 'Host Device'.

A parent (such as the Intel audio controller) would use sdw_md_add()
to create the device, passing a driver as a parameter. The
sdw_md_release() would be called when put_device() is invoked by the
parent. We use the shortcut 'md' for 'master device' to avoid very
long function names.

The 'Master Device' driver exposes interfaces for
probe/startup/shutdown/remove and a placeholder for autonomous clock
stop support (when the bus control is handed over to a lower-power
solution, typically in D0ix modes).

Module namespace support is added in a separate patch.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
drivers/soundwire/Makefile | 2 +-
drivers/soundwire/bus_type.c | 5 ++-
drivers/soundwire/master.c | 63 ++++++++++++++++++++++++++++++
include/linux/soundwire/sdw.h | 38 ++++++++++++++++++
include/linux/soundwire/sdw_type.h | 9 +++++
5 files changed, 115 insertions(+), 2 deletions(-)
create mode 100644 drivers/soundwire/master.c

diff --git a/drivers/soundwire/Makefile b/drivers/soundwire/Makefile
index 563894e5ecaf..89b29819dd3a 100644
--- a/drivers/soundwire/Makefile
+++ b/drivers/soundwire/Makefile
@@ -4,7 +4,7 @@
#

#Bus Objs
-soundwire-bus-objs := bus_type.o bus.o slave.o mipi_disco.o stream.o
+soundwire-bus-objs := bus_type.o bus.o master.o slave.o mipi_disco.o stream.o
obj-$(CONFIG_SOUNDWIRE) += soundwire-bus.o

ifdef CONFIG_DEBUG_FS
diff --git a/drivers/soundwire/bus_type.c b/drivers/soundwire/bus_type.c
index 605bc7ae57a8..2e4e8c2e629f 100644
--- a/drivers/soundwire/bus_type.c
+++ b/drivers/soundwire/bus_type.c
@@ -66,7 +66,10 @@ int sdw_uevent(struct device *dev, struct kobj_uevent_env *env)
* callback is set to use this function for a
* different device type (e.g. Master or Monitor)
*/
- dev_err(dev, "uevent for unknown Soundwire type\n");
+ if (is_sdw_master_device(dev))
+ dev_err(dev, "uevent for SoundWire Master type\n");
+ else
+ dev_err(dev, "uevent for unknown Soundwire type\n");
return -EINVAL;
}

diff --git a/drivers/soundwire/master.c b/drivers/soundwire/master.c
new file mode 100644
index 000000000000..b018c561708e
--- /dev/null
+++ b/drivers/soundwire/master.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: (GPL-2.0)
+// Copyright(c) 2019 Intel Corporation.
+
+#include <linux/device.h>
+#include <linux/acpi.h>
+#include <linux/soundwire/sdw.h>
+#include <linux/soundwire/sdw_type.h>
+#include "bus.h"
+
+static void sdw_md_release(struct device *dev)
+{
+ struct sdw_master_device *md = to_sdw_master_device(dev);
+
+ kfree(md);
+}
+
+struct device_type sdw_md_type = {
+ .name = "soundwire_master",
+ .release = sdw_md_release,
+};
+
+struct sdw_master_device *sdw_md_add(struct sdw_md_driver *driver,
+ struct device *parent,
+ struct fwnode_handle *fwnode,
+ int link_id)
+{
+ struct sdw_master_device *md;
+ int ret;
+
+ if (!driver->probe) {
+ dev_err(parent, "mandatory probe callback missing\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ md = kzalloc(sizeof(*md), GFP_KERNEL);
+ if (!md)
+ return ERR_PTR(-ENOMEM);
+
+ md->link_id = link_id;
+
+ md->driver = driver;
+
+ md->dev.parent = parent;
+ md->dev.fwnode = fwnode;
+ md->dev.bus = &sdw_bus_type;
+ md->dev.type = &sdw_md_type;
+ md->dev.dma_mask = md->dev.parent->dma_mask;
+ dev_set_name(&md->dev, "sdw-master-%d", md->link_id);
+
+ ret = device_register(&md->dev);
+ if (ret) {
+ dev_err(parent, "Failed to add master: ret %d\n", ret);
+ /*
+ * On err, don't free but drop ref as this will be freed
+ * when release method is invoked.
+ */
+ put_device(&md->dev);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ return md;
+}
+EXPORT_SYMBOL_GPL(sdw_md_add);
diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h
index 5b1180f1e6b5..f73c355de5e5 100644
--- a/include/linux/soundwire/sdw.h
+++ b/include/linux/soundwire/sdw.h
@@ -585,6 +585,16 @@ struct sdw_slave {
#define to_sdw_slave_device(d) \
container_of(d, struct sdw_slave, dev)

+struct sdw_master_device {
+ struct device dev;
+ int link_id;
+ struct sdw_md_driver *driver;
+ void *pdata;
+};
+
+#define to_sdw_master_device(d) \
+ container_of(d, struct sdw_master_device, dev)
+
struct sdw_driver {
const char *name;

@@ -599,6 +609,29 @@ struct sdw_driver {
struct device_driver driver;
};

+/**
+ * struct sdw_md_driver - SoundWire 'Master Device' driver
+ *
+ * @probe: initializations and allocation (hardware may not be enabled yet)
+ * @startup: initialization handled after the hardware is enabled, all
+ * clock/power dependencies are available
+ * @shutdown: cleanups before hardware is disabled (optional)
+ * @free: free all remaining resources
+ * @autonomous_clock_stop_enable: enable/disable driver control while
+ * in clock-stop mode, typically in always-on/D0ix modes. When the driver
+ * yields control, another entity in the system (typically firmware
+ * running on an always-on microprocessor) is responsible to tracking
+ * Slave-initiated wakes
+ */
+struct sdw_md_driver {
+ int (*probe)(struct sdw_master_device *md, void *link_ctx);
+ int (*startup)(struct sdw_master_device *md);
+ int (*shutdown)(struct sdw_master_device *md);
+ int (*remove)(struct sdw_master_device *md);
+ int (*autonomous_clock_stop_enable)(struct sdw_master_device *md,
+ bool state);
+};
+
#define SDW_SLAVE_ENTRY(_mfg_id, _part_id, _drv_data) \
{ .mfg_id = (_mfg_id), .part_id = (_part_id), \
.driver_data = (unsigned long)(_drv_data) }
@@ -788,6 +821,11 @@ struct sdw_bus {
int sdw_add_bus_master(struct sdw_bus *bus);
void sdw_delete_bus_master(struct sdw_bus *bus);

+struct sdw_master_device *sdw_md_add(struct sdw_md_driver *driver,
+ struct device *parent,
+ struct fwnode_handle *fwnode,
+ int link_id);
+
/**
* sdw_port_config: Master or Slave Port configuration
*
diff --git a/include/linux/soundwire/sdw_type.h b/include/linux/soundwire/sdw_type.h
index c681b3426478..a2a5ea7843a6 100644
--- a/include/linux/soundwire/sdw_type.h
+++ b/include/linux/soundwire/sdw_type.h
@@ -6,15 +6,24 @@

extern struct bus_type sdw_bus_type;
extern struct device_type sdw_slave_type;
+extern struct device_type sdw_md_type;

static inline int is_sdw_slave(const struct device *dev)
{
return dev->type == &sdw_slave_type;
}

+static inline int is_sdw_master_device(const struct device *dev)
+{
+ return dev->type == &sdw_md_type;
+}
+
#define to_sdw_slave_driver(_drv) \
container_of(_drv, struct sdw_driver, driver)

+#define to_sdw_md_driver(_drv) \
+ container_of(_drv, struct sdw_md_driver, driver)
+
#define sdw_register_slave_driver(drv) \
__sdw_register_slave_driver(drv, THIS_MODULE)

--
2.20.1
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