[linux-2.6-block.git] / drivers / soundwire / slave.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
Commit	Line	Data
7c3cd189 VK	1	// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
	2	// Copyright(c) 2015-17 Intel Corporation.
	3
	4	#include <linux/acpi.h>
	5	#include <linux/soundwire/sdw.h>
	6	#include <linux/soundwire/sdw_type.h>
	7	#include "bus.h"
	8
	9	static void sdw_slave_release(struct device *dev)
	10	{
	11	struct sdw_slave *slave = dev_to_sdw_dev(dev);
	12
	13	kfree(slave);
	14	}
	15
	16	static int sdw_slave_add(struct sdw_bus *bus,
	17	struct sdw_slave_id id, struct fwnode_handle fwnode)
	18	{
	19	struct sdw_slave *slave;
	20	int ret;
	21
	22	slave = kzalloc(sizeof(*slave), GFP_KERNEL);
	23	if (!slave)
	24	return -ENOMEM;
	25
	26	/* Initialize data structure */
	27	memcpy(&slave->id, id, sizeof(*id));
	28	slave->dev.parent = bus->dev;
	29	slave->dev.fwnode = fwnode;
	30
	31	/* name shall be sdw:link:mfg:part:class:unique */
	32	dev_set_name(&slave->dev, "sdw:%x:%x:%x:%x:%x",
	33	bus->link_id, id->mfg_id, id->part_id,
	34	id->class_id, id->unique_id);
	35
	36	slave->dev.release = sdw_slave_release;
	37	slave->dev.bus = &sdw_bus_type;
	38	slave->bus = bus;
	39	slave->status = SDW_SLAVE_UNATTACHED;
	40	slave->dev_num = 0;
	41
	42	mutex_lock(&bus->bus_lock);
	43	list_add_tail(&slave->node, &bus->slaves);
	44	mutex_unlock(&bus->bus_lock);
	45
	46	ret = device_register(&slave->dev);
	47	if (ret) {
	48	dev_err(bus->dev, "Failed to add slave: ret %d\n", ret);
	49
	50	/*
	51	* On err, don't free but drop ref as this will be freed
	52	* when release method is invoked.
	53	*/
	54	mutex_lock(&bus->bus_lock);
	55	list_del(&slave->node);
	56	mutex_unlock(&bus->bus_lock);
	57	put_device(&slave->dev);
	58	}
	59
	60	return ret;
	61	}
	62
	63	#if IS_ENABLED(CONFIG_ACPI)
	64	/*
65	* sdw_acpi_find_slaves() - Find Slave devices in Master ACPI node
66	* @bus: SDW bus instance
67	*
68	* Scans Master ACPI node for SDW child Slave devices and registers it.
69	*/
70	int sdw_acpi_find_slaves(struct sdw_bus *bus)
71	{
72	struct acpi_device adev, parent;
73
74	parent = ACPI_COMPANION(bus->dev);
75	if (!parent) {
76	dev_err(bus->dev, "Can't find parent for acpi bind\n");
77	return -ENODEV;
78	}
79
80	list_for_each_entry(adev, &parent->children, node) {
81	unsigned long long addr;
82	struct sdw_slave_id id;
83	unsigned int link_id;
84	acpi_status status;
85
86	status = acpi_evaluate_integer(adev->handle,
87	METHOD_NAME__ADR, NULL, &addr);
88
89	if (ACPI_FAILURE(status)) {
90	dev_err(bus->dev, "_ADR resolution failed: %x\n",
91	status);
92	return status;
93	}
94
95	/* Extract link id from ADR, Bit 51 to 48 (included) */
96	link_id = (addr >> 48) & GENMASK(3, 0);
97
98	/* Check for link_id match */
99	if (link_id != bus->link_id)
100	continue;
101
102	sdw_extract_slave_id(bus, addr, &id);
103
104	/*
105	* don't error check for sdw_slave_add as we want to continue
106	* adding Slaves
107	*/
108	sdw_slave_add(bus, &id, acpi_fwnode_handle(adev));
109	}
110
111	return 0;
112	}
113
114	#endif