mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-06 02:24:14 +08:00
90acca1d54
this is a preparatory patch before the introduction of the sdw_master_type. The SoundWire slave support is slightly modified with the use of a sdw_slave_type, and the uevent handling move to slave.c (since it's not necessary for the master). No functionality change other than moving code around. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com> Acked-by: Jaroslav Kysela <perex@perex.cz> Link: https://lore.kernel.org/r/20200518174322.31561-3-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
237 lines
5.4 KiB
C
237 lines
5.4 KiB
C
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
|
|
// Copyright(c) 2015-17 Intel Corporation.
|
|
|
|
#include <linux/acpi.h>
|
|
#include <linux/of.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);
|
|
}
|
|
|
|
struct device_type sdw_slave_type = {
|
|
.name = "sdw_slave",
|
|
.release = sdw_slave_release,
|
|
.uevent = sdw_slave_uevent,
|
|
};
|
|
|
|
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;
|
|
|
|
if (id->unique_id == SDW_IGNORED_UNIQUE_ID) {
|
|
/* name shall be sdw:link:mfg:part:class */
|
|
dev_set_name(&slave->dev, "sdw:%x:%x:%x:%x",
|
|
bus->link_id, id->mfg_id, id->part_id,
|
|
id->class_id);
|
|
} else {
|
|
/* 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.bus = &sdw_bus_type;
|
|
slave->dev.of_node = of_node_get(to_of_node(fwnode));
|
|
slave->dev.type = &sdw_slave_type;
|
|
slave->bus = bus;
|
|
slave->status = SDW_SLAVE_UNATTACHED;
|
|
init_completion(&slave->enumeration_complete);
|
|
init_completion(&slave->initialization_complete);
|
|
slave->dev_num = 0;
|
|
init_completion(&slave->probe_complete);
|
|
slave->probed = false;
|
|
|
|
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;
|
|
}
|
|
sdw_slave_debugfs_init(slave);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_ACPI)
|
|
|
|
static bool find_slave(struct sdw_bus *bus,
|
|
struct acpi_device *adev,
|
|
struct sdw_slave_id *id)
|
|
{
|
|
unsigned long long addr;
|
|
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 false;
|
|
}
|
|
|
|
/* 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)
|
|
return false;
|
|
|
|
sdw_extract_slave_id(bus, addr, id);
|
|
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
struct acpi_device *adev2, *parent2;
|
|
|
|
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) {
|
|
struct sdw_slave_id id;
|
|
struct sdw_slave_id id2;
|
|
bool ignore_unique_id = true;
|
|
|
|
if (!find_slave(bus, adev, &id))
|
|
continue;
|
|
|
|
/* brute-force O(N^2) search for duplicates */
|
|
parent2 = parent;
|
|
list_for_each_entry(adev2, &parent2->children, node) {
|
|
|
|
if (adev == adev2)
|
|
continue;
|
|
|
|
if (!find_slave(bus, adev2, &id2))
|
|
continue;
|
|
|
|
if (id.sdw_version != id2.sdw_version ||
|
|
id.mfg_id != id2.mfg_id ||
|
|
id.part_id != id2.part_id ||
|
|
id.class_id != id2.class_id)
|
|
continue;
|
|
|
|
if (id.unique_id != id2.unique_id) {
|
|
dev_dbg(bus->dev,
|
|
"Valid unique IDs %x %x for Slave mfg %x part %d\n",
|
|
id.unique_id, id2.unique_id,
|
|
id.mfg_id, id.part_id);
|
|
ignore_unique_id = false;
|
|
} else {
|
|
dev_err(bus->dev,
|
|
"Invalid unique IDs %x %x for Slave mfg %x part %d\n",
|
|
id.unique_id, id2.unique_id,
|
|
id.mfg_id, id.part_id);
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
|
|
if (ignore_unique_id)
|
|
id.unique_id = SDW_IGNORED_UNIQUE_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
|
|
|
|
/*
|
|
* sdw_of_find_slaves() - Find Slave devices in master device tree node
|
|
* @bus: SDW bus instance
|
|
*
|
|
* Scans Master DT node for SDW child Slave devices and registers it.
|
|
*/
|
|
int sdw_of_find_slaves(struct sdw_bus *bus)
|
|
{
|
|
struct device *dev = bus->dev;
|
|
struct device_node *node;
|
|
|
|
for_each_child_of_node(bus->dev->of_node, node) {
|
|
int link_id, ret, len;
|
|
unsigned int sdw_version;
|
|
const char *compat = NULL;
|
|
struct sdw_slave_id id;
|
|
const __be32 *addr;
|
|
|
|
compat = of_get_property(node, "compatible", NULL);
|
|
if (!compat)
|
|
continue;
|
|
|
|
ret = sscanf(compat, "sdw%01x%04hx%04hx%02hhx", &sdw_version,
|
|
&id.mfg_id, &id.part_id, &id.class_id);
|
|
|
|
if (ret != 4) {
|
|
dev_err(dev, "Invalid compatible string found %s\n",
|
|
compat);
|
|
continue;
|
|
}
|
|
|
|
addr = of_get_property(node, "reg", &len);
|
|
if (!addr || (len < 2 * sizeof(u32))) {
|
|
dev_err(dev, "Invalid Link and Instance ID\n");
|
|
continue;
|
|
}
|
|
|
|
link_id = be32_to_cpup(addr++);
|
|
id.unique_id = be32_to_cpup(addr);
|
|
id.sdw_version = sdw_version;
|
|
|
|
/* Check for link_id match */
|
|
if (link_id != bus->link_id)
|
|
continue;
|
|
|
|
sdw_slave_add(bus, &id, of_fwnode_handle(node));
|
|
}
|
|
|
|
return 0;
|
|
}
|