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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>
115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
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// Copyright(c) 2015-17 Intel Corporation.
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#include <linux/acpi.h>
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#include <linux/soundwire/sdw.h>
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#include <linux/soundwire/sdw_type.h>
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#include "bus.h"
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static void sdw_slave_release(struct device *dev)
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{
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struct sdw_slave *slave = dev_to_sdw_dev(dev);
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kfree(slave);
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}
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static int sdw_slave_add(struct sdw_bus *bus,
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struct sdw_slave_id *id, struct fwnode_handle *fwnode)
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{
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struct sdw_slave *slave;
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int ret;
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slave = kzalloc(sizeof(*slave), GFP_KERNEL);
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if (!slave)
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return -ENOMEM;
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/* Initialize data structure */
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memcpy(&slave->id, id, sizeof(*id));
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slave->dev.parent = bus->dev;
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slave->dev.fwnode = fwnode;
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/* name shall be sdw:link:mfg:part:class:unique */
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dev_set_name(&slave->dev, "sdw:%x:%x:%x:%x:%x",
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bus->link_id, id->mfg_id, id->part_id,
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id->class_id, id->unique_id);
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slave->dev.release = sdw_slave_release;
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slave->dev.bus = &sdw_bus_type;
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slave->bus = bus;
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slave->status = SDW_SLAVE_UNATTACHED;
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slave->dev_num = 0;
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mutex_lock(&bus->bus_lock);
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list_add_tail(&slave->node, &bus->slaves);
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mutex_unlock(&bus->bus_lock);
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ret = device_register(&slave->dev);
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if (ret) {
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dev_err(bus->dev, "Failed to add slave: ret %d\n", ret);
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/*
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* On err, don't free but drop ref as this will be freed
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* when release method is invoked.
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*/
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mutex_lock(&bus->bus_lock);
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list_del(&slave->node);
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mutex_unlock(&bus->bus_lock);
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put_device(&slave->dev);
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}
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return ret;
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}
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#if IS_ENABLED(CONFIG_ACPI)
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/*
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* sdw_acpi_find_slaves() - Find Slave devices in Master ACPI node
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* @bus: SDW bus instance
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*
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* Scans Master ACPI node for SDW child Slave devices and registers it.
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*/
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int sdw_acpi_find_slaves(struct sdw_bus *bus)
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{
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struct acpi_device *adev, *parent;
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parent = ACPI_COMPANION(bus->dev);
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if (!parent) {
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dev_err(bus->dev, "Can't find parent for acpi bind\n");
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return -ENODEV;
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}
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list_for_each_entry(adev, &parent->children, node) {
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unsigned long long addr;
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struct sdw_slave_id id;
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unsigned int link_id;
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acpi_status status;
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status = acpi_evaluate_integer(adev->handle,
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METHOD_NAME__ADR, NULL, &addr);
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if (ACPI_FAILURE(status)) {
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dev_err(bus->dev, "_ADR resolution failed: %x\n",
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status);
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return status;
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}
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/* Extract link id from ADR, Bit 51 to 48 (included) */
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link_id = (addr >> 48) & GENMASK(3, 0);
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/* Check for link_id match */
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if (link_id != bus->link_id)
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continue;
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sdw_extract_slave_id(bus, addr, &id);
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/*
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* don't error check for sdw_slave_add as we want to continue
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* adding Slaves
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*/
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sdw_slave_add(bus, &id, acpi_fwnode_handle(adev));
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}
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return 0;
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}
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#endif
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