diff options
Diffstat (limited to 'drivers/soundwire/master.c')
-rw-r--r-- | drivers/soundwire/master.c | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/drivers/soundwire/master.c b/drivers/soundwire/master.c new file mode 100644 index 000000000000..6be0a027def7 --- /dev/null +++ b/drivers/soundwire/master.c @@ -0,0 +1,81 @@ +// SPDX-License-Identifier: GPL-2.0-only +// Copyright(c) 2019-2020 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_master_device_release(struct device *dev) +{ + struct sdw_master_device *md = dev_to_sdw_master_device(dev); + + kfree(md); +} + +struct device_type sdw_master_type = { + .name = "soundwire_master", + .release = sdw_master_device_release, +}; + +/** + * sdw_master_device_add() - create a Linux Master Device representation. + * @bus: SDW bus instance + * @parent: parent device + * @fwnode: firmware node handle + */ +int sdw_master_device_add(struct sdw_bus *bus, struct device *parent, + struct fwnode_handle *fwnode) +{ + struct sdw_master_device *md; + int ret; + + if (!parent) + return -EINVAL; + + md = kzalloc(sizeof(*md), GFP_KERNEL); + if (!md) + return -ENOMEM; + + md->dev.bus = &sdw_bus_type; + md->dev.type = &sdw_master_type; + md->dev.parent = parent; + md->dev.of_node = parent->of_node; + md->dev.fwnode = fwnode; + md->dev.dma_mask = parent->dma_mask; + + dev_set_name(&md->dev, "sdw-master-%d", bus->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); + goto device_register_err; + } + + /* add shortcuts to improve code readability/compactness */ + md->bus = bus; + bus->dev = &md->dev; + bus->md = md; + +device_register_err: + return ret; +} + +/** + * sdw_master_device_del() - delete a Linux Master Device representation. + * @bus: bus handle + * + * This function is the dual of sdw_master_device_add() + */ +int sdw_master_device_del(struct sdw_bus *bus) +{ + device_unregister(bus->dev); + + return 0; +} |