mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 10:40:15 +02:00
7c3cd189b8
A Master adds a SoundWire bus instance which scans the firmware provided for device description. In this patch we scan ACPI namespaces and create SoundWire Slave devices based on ACPI description Signed-off-by: Sanyog Kale <sanyog.r.kale@intel.com> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Acked-By: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Reviewed-by: Takashi Iwai <tiwai@suse.de> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Vinod Koul <vinod.koul@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
114 lines
2.6 KiB
C
114 lines
2.6 KiB
C
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
|
|
// Copyright(c) 2015-17 Intel Corporation.
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/soundwire/sdw.h>
|
|
#include <linux/soundwire/sdw_type.h>
|
|
#include "bus.h"
|
|
|
|
static void sdw_slave_release(struct device *dev)
|
|
{
|
|
struct sdw_slave *slave = dev_to_sdw_dev(dev);
|
|
|
|
kfree(slave);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_ACPI)
|
|
/*
|
|
* sdw_acpi_find_slaves() - Find Slave devices in Master ACPI node
|
|
* @bus: SDW bus instance
|
|
*
|
|
* Scans Master ACPI node for SDW child Slave devices and registers it.
|
|
*/
|
|
int sdw_acpi_find_slaves(struct sdw_bus *bus)
|
|
{
|
|
struct acpi_device *adev, *parent;
|
|
|
|
parent = ACPI_COMPANION(bus->dev);
|
|
if (!parent) {
|
|
dev_err(bus->dev, "Can't find parent for acpi bind\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
list_for_each_entry(adev, &parent->children, node) {
|
|
unsigned long long addr;
|
|
struct sdw_slave_id id;
|
|
unsigned int link_id;
|
|
acpi_status status;
|
|
|
|
status = acpi_evaluate_integer(adev->handle,
|
|
METHOD_NAME__ADR, NULL, &addr);
|
|
|
|
if (ACPI_FAILURE(status)) {
|
|
dev_err(bus->dev, "_ADR resolution failed: %x\n",
|
|
status);
|
|
return status;
|
|
}
|
|
|
|
/* Extract link id from ADR, Bit 51 to 48 (included) */
|
|
link_id = (addr >> 48) & GENMASK(3, 0);
|
|
|
|
/* Check for link_id match */
|
|
if (link_id != bus->link_id)
|
|
continue;
|
|
|
|
sdw_extract_slave_id(bus, addr, &id);
|
|
|
|
/*
|
|
* don't error check for sdw_slave_add as we want to continue
|
|
* adding Slaves
|
|
*/
|
|
sdw_slave_add(bus, &id, acpi_fwnode_handle(adev));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif
|