// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
// Copyright(c) 2015-17 Intel Corporation.
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/mod_devicetable.h>
#include <linux/pm_runtime.h>
#include <linux/soundwire/sdw_registers.h>
#include <linux/soundwire/sdw.h>
#include "bus.h"
#include "sysfs_local.h"
static DEFINE_IDA(sdw_ida);
static int sdw_get_id(struct sdw_bus *bus)
{
int rc = ida_alloc(&sdw_ida, GFP_KERNEL);
if (rc < 0)
return rc;
bus->id = rc;
return 0;
}
/**
* sdw_bus_master_add() - add a bus Master instance
* @bus: bus instance
* @parent: parent device
* @fwnode: firmware node handle
*
* Initializes the bus instance, read properties and create child
* devices.
*/
int sdw_bus_master_add(struct sdw_bus *bus, struct device *parent,
struct fwnode_handle *fwnode)
{
struct sdw_master_prop *prop = NULL;
int ret;
if (!parent) {
pr_err("SoundWire parent device is not set\n");
return -ENODEV;
}
ret = sdw_get_id(bus);
if (ret) {
dev_err(parent, "Failed to get bus id\n");
return ret;
}
ret = sdw_master_device_add(bus, parent, fwnode);
if (ret) {
dev_err(parent, "Failed to add master device at link %d\n",
bus->link_id);
return ret;
}
if (!bus->ops) {
dev_err(bus->dev, "SoundWire Bus ops are not set\n");
return -EINVAL;
}
mutex_init(&bus->msg_lock);
mutex_init(&bus->bus_lock);
INIT_LIST_HEAD(&bus->slaves);
INIT_LIST_HEAD(&bus->m_rt_list);
/*
* Initialize multi_link flag
* TODO: populate this flag by reading property from FW node
*/
bus->multi_link = false;
if (bus->ops->read_prop) {
ret = bus->ops->read_prop(bus);
if (ret < 0) {
dev_err(bus->dev,
"Bus read properties failed:%d\n", ret);
return ret;
}
}
sdw_bus_debugfs_init(bus);
/*
* Device numbers in SoundWire are 0 through 15. Enumeration device
* number (0), Broadcast device number (15), Group numbers (12 and
* 13) and Master device number (14) are not used
| 