Since we want an explicit support for the SoundWire Master device, add the definitions, following the Grey Bus example.
Open: do we need to set a variable when dealing with the master uevent?
Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- drivers/soundwire/Makefile | 2 +- drivers/soundwire/bus_type.c | 16 +++--- drivers/soundwire/master.c | 78 ++++++++++++++++++++++++++++++ include/linux/soundwire/sdw.h | 35 ++++++++++++++ include/linux/soundwire/sdw_type.h | 9 ++++ 5 files changed, 133 insertions(+), 7 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 5df095f4e12f..cf33f63773f0 100644 --- a/drivers/soundwire/bus_type.c +++ b/drivers/soundwire/bus_type.c @@ -49,21 +49,25 @@ int sdw_slave_modalias(const struct sdw_slave *slave, char *buf, size_t size)
static int sdw_uevent(struct device *dev, struct kobj_uevent_env *env) { + struct sdw_master_device *md; struct sdw_slave *slave; char modalias[32];
- if (is_sdw_slave(dev)) { + if (is_sdw_md(dev)) { + md = to_sdw_master_device(dev); + /* TODO: do we need to call add_uevent_var() ? */ + } else if (is_sdw_slave(dev)) { slave = to_sdw_slave_device(dev); + + sdw_slave_modalias(slave, modalias, sizeof(modalias)); + + if (add_uevent_var(env, "MODALIAS=%s", modalias)) + return -ENOMEM; } else { dev_warn(dev, "uevent for unknown Soundwire type\n"); return -EINVAL; }
- sdw_slave_modalias(slave, modalias, sizeof(modalias)); - - if (add_uevent_var(env, "MODALIAS=%s", modalias)) - return -ENOMEM; - return 0; }
diff --git a/drivers/soundwire/master.c b/drivers/soundwire/master.c new file mode 100644 index 000000000000..d9d09759b9c3 --- /dev/null +++ b/drivers/soundwire/master.c @@ -0,0 +1,78 @@ +// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) +// 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 ssize_t bus_id_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct sdw_master_device *md = to_sdw_master_device(dev); + + return sprintf(buf, "%d\n", md->link_id); +} +static DEVICE_ATTR_RO(bus_id); + +static struct attribute *bus_attrs[] = { + &dev_attr_bus_id.attr, + NULL +}; +ATTRIBUTE_GROUPS(bus); + +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.groups = bus_groups; + 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 md; +} +EXPORT_SYMBOL(sdw_md_add); diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index f004de91ce24..6289924b0336 100644 --- a/include/linux/soundwire/sdw.h +++ b/include/linux/soundwire/sdw.h @@ -564,6 +564,16 @@ 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; /* core does not touch */ +}; + +#define to_sdw_master_device(d) \ + container_of(d, struct sdw_master_device, dev) + struct sdw_driver { const char *name;
@@ -578,6 +588,26 @@ struct sdw_driver { struct device_driver driver; };
+struct sdw_md_driver { + /* initializations and allocations */ + int (*probe)(struct sdw_master_device *md, void *link_ctx); + /* hardware enablement, all clock/power dependencies are available */ + int (*startup)(struct sdw_master_device *md); + /* hardware disabled */ + int (*shutdown)(struct sdw_master_device *md); + /* free all resources */ + int (*remove)(struct sdw_master_device *md); + /* + * 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 + */ + 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) } @@ -767,6 +797,11 @@ 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..463d6d018d56 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_md(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)