1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2 // Copyright(c) 2015-17 Intel Corporation.
4 #include <linux/acpi.h>
6 #include <linux/soundwire/sdw.h>
7 #include <linux/soundwire/sdw_type.h>
10 static void sdw_slave_release(struct device *dev)
12 struct sdw_slave *slave = dev_to_sdw_dev(dev);
17 struct device_type sdw_slave_type = {
19 .release = sdw_slave_release,
20 .uevent = sdw_slave_uevent,
23 int sdw_slave_add(struct sdw_bus *bus,
24 struct sdw_slave_id *id, struct fwnode_handle *fwnode)
26 struct sdw_slave *slave;
30 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
34 /* Initialize data structure */
35 memcpy(&slave->id, id, sizeof(*id));
36 slave->dev.parent = bus->dev;
37 slave->dev.fwnode = fwnode;
39 if (id->unique_id == SDW_IGNORED_UNIQUE_ID) {
40 /* name shall be sdw:link:mfg:part:class */
41 dev_set_name(&slave->dev, "sdw:%x:%x:%x:%x",
42 bus->link_id, id->mfg_id, id->part_id,
45 /* name shall be sdw:link:mfg:part:class:unique */
46 dev_set_name(&slave->dev, "sdw:%x:%x:%x:%x:%x",
47 bus->link_id, id->mfg_id, id->part_id,
48 id->class_id, id->unique_id);
51 slave->dev.bus = &sdw_bus_type;
52 slave->dev.of_node = of_node_get(to_of_node(fwnode));
53 slave->dev.type = &sdw_slave_type;
55 slave->status = SDW_SLAVE_UNATTACHED;
56 init_completion(&slave->enumeration_complete);
57 init_completion(&slave->initialization_complete);
59 init_completion(&slave->probe_complete);
60 slave->probed = false;
61 slave->first_interrupt_done = false;
63 for (i = 0; i < SDW_MAX_PORTS; i++)
64 init_completion(&slave->port_ready[i]);
66 mutex_lock(&bus->bus_lock);
67 list_add_tail(&slave->node, &bus->slaves);
68 mutex_unlock(&bus->bus_lock);
70 ret = device_register(&slave->dev);
72 dev_err(bus->dev, "Failed to add slave: ret %d\n", ret);
75 * On err, don't free but drop ref as this will be freed
76 * when release method is invoked.
78 mutex_lock(&bus->bus_lock);
79 list_del(&slave->node);
80 mutex_unlock(&bus->bus_lock);
81 put_device(&slave->dev);
85 sdw_slave_debugfs_init(slave);
90 #if IS_ENABLED(CONFIG_ACPI)
92 static bool find_slave(struct sdw_bus *bus,
93 struct acpi_device *adev,
94 struct sdw_slave_id *id)
96 unsigned long long addr;
100 status = acpi_evaluate_integer(adev->handle,
101 METHOD_NAME__ADR, NULL, &addr);
103 if (ACPI_FAILURE(status)) {
104 dev_err(bus->dev, "_ADR resolution failed: %x\n",
109 /* Extract link id from ADR, Bit 51 to 48 (included) */
110 link_id = SDW_DISCO_LINK_ID(addr);
112 /* Check for link_id match */
113 if (link_id != bus->link_id)
116 sdw_extract_slave_id(bus, addr, id);
122 * sdw_acpi_find_slaves() - Find Slave devices in Master ACPI node
123 * @bus: SDW bus instance
125 * Scans Master ACPI node for SDW child Slave devices and registers it.
127 int sdw_acpi_find_slaves(struct sdw_bus *bus)
129 struct acpi_device *adev, *parent;
130 struct acpi_device *adev2, *parent2;
132 parent = ACPI_COMPANION(bus->dev);
134 dev_err(bus->dev, "Can't find parent for acpi bind\n");
138 list_for_each_entry(adev, &parent->children, node) {
139 struct sdw_slave_id id;
140 struct sdw_slave_id id2;
141 bool ignore_unique_id = true;
143 if (!find_slave(bus, adev, &id))
146 /* brute-force O(N^2) search for duplicates */
148 list_for_each_entry(adev2, &parent2->children, node) {
153 if (!find_slave(bus, adev2, &id2))
156 if (id.sdw_version != id2.sdw_version ||
157 id.mfg_id != id2.mfg_id ||
158 id.part_id != id2.part_id ||
159 id.class_id != id2.class_id)
162 if (id.unique_id != id2.unique_id) {
164 "Valid unique IDs %x %x for Slave mfg %x part %d\n",
165 id.unique_id, id2.unique_id,
166 id.mfg_id, id.part_id);
167 ignore_unique_id = false;
170 "Invalid unique IDs %x %x for Slave mfg %x part %d\n",
171 id.unique_id, id2.unique_id,
172 id.mfg_id, id.part_id);
177 if (ignore_unique_id)
178 id.unique_id = SDW_IGNORED_UNIQUE_ID;
181 * don't error check for sdw_slave_add as we want to continue
184 sdw_slave_add(bus, &id, acpi_fwnode_handle(adev));
193 * sdw_of_find_slaves() - Find Slave devices in master device tree node
194 * @bus: SDW bus instance
196 * Scans Master DT node for SDW child Slave devices and registers it.
198 int sdw_of_find_slaves(struct sdw_bus *bus)
200 struct device *dev = bus->dev;
201 struct device_node *node;
203 for_each_child_of_node(bus->dev->of_node, node) {
204 int link_id, ret, len;
205 unsigned int sdw_version;
206 const char *compat = NULL;
207 struct sdw_slave_id id;
210 compat = of_get_property(node, "compatible", NULL);
214 ret = sscanf(compat, "sdw%01x%04hx%04hx%02hhx", &sdw_version,
215 &id.mfg_id, &id.part_id, &id.class_id);
218 dev_err(dev, "Invalid compatible string found %s\n",
223 addr = of_get_property(node, "reg", &len);
224 if (!addr || (len < 2 * sizeof(u32))) {
225 dev_err(dev, "Invalid Link and Instance ID\n");
229 link_id = be32_to_cpup(addr++);
230 id.unique_id = be32_to_cpup(addr);
231 id.sdw_version = sdw_version;
233 /* Check for link_id match */
234 if (link_id != bus->link_id)
237 sdw_slave_add(bus, &id, of_fwnode_handle(node));