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/of.h>
6 #include <linux/soundwire/sdw.h>
7 #include <linux/soundwire/sdw_type.h>
8 #include <sound/sdca.h>
9 #include "bus.h"
10 #include "sysfs_local.h"
11
sdw_slave_release(struct device * dev)12 static void sdw_slave_release(struct device *dev)
13 {
14 struct sdw_slave *slave = dev_to_sdw_dev(dev);
15
16 of_node_put(slave->dev.of_node);
17 mutex_destroy(&slave->sdw_dev_lock);
18 kfree(slave);
19 }
20
21 const struct device_type sdw_slave_type = {
22 .name = "sdw_slave",
23 .release = sdw_slave_release,
24 .uevent = sdw_slave_uevent,
25 };
26 EXPORT_SYMBOL_GPL(sdw_slave_type);
27
sdw_slave_add(struct sdw_bus * bus,struct sdw_slave_id * id,struct fwnode_handle * fwnode)28 int sdw_slave_add(struct sdw_bus *bus,
29 struct sdw_slave_id *id, struct fwnode_handle *fwnode)
30 {
31 struct sdw_slave *slave;
32 int ret;
33 int i;
34
35 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
36 if (!slave)
37 return -ENOMEM;
38
39 /* Initialize data structure */
40 memcpy(&slave->id, id, sizeof(*id));
41 slave->dev.parent = bus->dev;
42 slave->dev.fwnode = fwnode;
43
44 if (id->unique_id == SDW_IGNORED_UNIQUE_ID) {
45 /* name shall be sdw:ctrl:link:mfg:part:class */
46 dev_set_name(&slave->dev, "sdw:%01x:%01x:%04x:%04x:%02x",
47 bus->controller_id, bus->link_id, id->mfg_id, id->part_id,
48 id->class_id);
49 } else {
50 /* name shall be sdw:ctrl:link:mfg:part:class:unique */
51 dev_set_name(&slave->dev, "sdw:%01x:%01x:%04x:%04x:%02x:%01x",
52 bus->controller_id, bus->link_id, id->mfg_id, id->part_id,
53 id->class_id, id->unique_id);
54 }
55
56 slave->dev.bus = &sdw_bus_type;
57 slave->dev.of_node = of_node_get(to_of_node(fwnode));
58 slave->dev.type = &sdw_slave_type;
59 slave->dev.groups = sdw_slave_status_attr_groups;
60 slave->bus = bus;
61 slave->status = SDW_SLAVE_UNATTACHED;
62 init_completion(&slave->enumeration_complete);
63 init_completion(&slave->initialization_complete);
64 slave->dev_num = 0;
65 slave->probed = false;
66 slave->first_interrupt_done = false;
67 mutex_init(&slave->sdw_dev_lock);
68
69 for (i = 0; i < SDW_MAX_PORTS; i++)
70 init_completion(&slave->port_ready[i]);
71
72 mutex_lock(&bus->bus_lock);
73 list_add_tail(&slave->node, &bus->slaves);
74 mutex_unlock(&bus->bus_lock);
75
76 /*
77 * The Soundwire driver probe may optionally register SDCA
78 * sub-devices, one per Function. This means the information
79 * on the SDCA revision and the number/type of Functions need
80 * to be extracted from platform firmware before the SoundWire
81 * driver probe, and as a consequence before the SoundWire
82 * device_register() below.
83 */
84 sdca_lookup_interface_revision(slave);
85 sdca_lookup_functions(slave);
86
87 ret = device_register(&slave->dev);
88 if (ret) {
89 dev_err(bus->dev, "Failed to add slave: ret %d\n", ret);
90
91 /*
92 * On err, don't free but drop ref as this will be freed
93 * when release method is invoked.
94 */
95 mutex_lock(&bus->bus_lock);
96 list_del(&slave->node);
97 mutex_unlock(&bus->bus_lock);
98 put_device(&slave->dev);
99
100 return ret;
101 }
102 sdw_slave_debugfs_init(slave);
103
104 return ret;
105 }
106 EXPORT_SYMBOL(sdw_slave_add);
107
108 #if IS_ENABLED(CONFIG_ACPI)
109
find_slave(struct sdw_bus * bus,struct acpi_device * adev,struct sdw_slave_id * id)110 static bool find_slave(struct sdw_bus *bus,
111 struct acpi_device *adev,
112 struct sdw_slave_id *id)
113 {
114 unsigned int link_id;
115 u64 addr;
116 int ret;
117
118 ret = acpi_get_local_u64_address(adev->handle, &addr);
119 if (ret < 0)
120 return false;
121
122 if (bus->ops->override_adr)
123 addr = bus->ops->override_adr(bus, addr);
124
125 if (!addr)
126 return false;
127
128 /* Extract link id from ADR, Bit 51 to 48 (included) */
129 link_id = SDW_DISCO_LINK_ID(addr);
130
131 /* Check for link_id match */
132 if (link_id != bus->link_id)
133 return false;
134
135 sdw_extract_slave_id(bus, addr, id);
136
137 return true;
138 }
139
140 struct sdw_acpi_child_walk_data {
141 struct sdw_bus *bus;
142 struct acpi_device *adev;
143 struct sdw_slave_id id;
144 bool ignore_unique_id;
145 };
146
sdw_acpi_check_duplicate(struct acpi_device * adev,void * data)147 static int sdw_acpi_check_duplicate(struct acpi_device *adev, void *data)
148 {
149 struct sdw_acpi_child_walk_data *cwd = data;
150 struct sdw_bus *bus = cwd->bus;
151 struct sdw_slave_id id;
152
153 if (adev == cwd->adev)
154 return 0;
155
156 if (!find_slave(bus, adev, &id))
157 return 0;
158
159 if (cwd->id.sdw_version != id.sdw_version || cwd->id.mfg_id != id.mfg_id ||
160 cwd->id.part_id != id.part_id || cwd->id.class_id != id.class_id)
161 return 0;
162
163 if (cwd->id.unique_id != id.unique_id) {
164 dev_dbg(bus->dev,
165 "Valid unique IDs 0x%x 0x%x for Slave mfg_id 0x%04x, part_id 0x%04x\n",
166 cwd->id.unique_id, id.unique_id, cwd->id.mfg_id,
167 cwd->id.part_id);
168 cwd->ignore_unique_id = false;
169 return 0;
170 }
171
172 dev_err(bus->dev,
173 "Invalid unique IDs 0x%x 0x%x for Slave mfg_id 0x%04x, part_id 0x%04x\n",
174 cwd->id.unique_id, id.unique_id, cwd->id.mfg_id, cwd->id.part_id);
175 return -ENODEV;
176 }
177
sdw_acpi_find_one(struct acpi_device * adev,void * data)178 static int sdw_acpi_find_one(struct acpi_device *adev, void *data)
179 {
180 struct sdw_bus *bus = data;
181 struct sdw_acpi_child_walk_data cwd = {
182 .bus = bus,
183 .adev = adev,
184 .ignore_unique_id = true,
185 };
186 int ret;
187
188 if (!find_slave(bus, adev, &cwd.id))
189 return 0;
190
191 /* Brute-force O(N^2) search for duplicates. */
192 ret = acpi_dev_for_each_child(ACPI_COMPANION(bus->dev),
193 sdw_acpi_check_duplicate, &cwd);
194 if (ret)
195 return ret;
196
197 if (cwd.ignore_unique_id)
198 cwd.id.unique_id = SDW_IGNORED_UNIQUE_ID;
199
200 /* Ignore errors and continue. */
201 sdw_slave_add(bus, &cwd.id, acpi_fwnode_handle(adev));
202 return 0;
203 }
204
205 /*
206 * sdw_acpi_find_slaves() - Find Slave devices in Master ACPI node
207 * @bus: SDW bus instance
208 *
209 * Scans Master ACPI node for SDW child Slave devices and registers it.
210 */
sdw_acpi_find_slaves(struct sdw_bus * bus)211 int sdw_acpi_find_slaves(struct sdw_bus *bus)
212 {
213 struct acpi_device *parent;
214
215 parent = ACPI_COMPANION(bus->dev);
216 if (!parent) {
217 dev_err(bus->dev, "Can't find parent for acpi bind\n");
218 return -ENODEV;
219 }
220
221 return acpi_dev_for_each_child(parent, sdw_acpi_find_one, bus);
222 }
223
224 #endif
225
226 /*
227 * sdw_of_find_slaves() - Find Slave devices in master device tree node
228 * @bus: SDW bus instance
229 *
230 * Scans Master DT node for SDW child Slave devices and registers it.
231 */
sdw_of_find_slaves(struct sdw_bus * bus)232 int sdw_of_find_slaves(struct sdw_bus *bus)
233 {
234 struct device *dev = bus->dev;
235 struct device_node *node;
236
237 for_each_child_of_node(bus->dev->of_node, node) {
238 int link_id, ret, len;
239 unsigned int sdw_version;
240 const char *compat = NULL;
241 struct sdw_slave_id id;
242 const __be32 *addr;
243
244 compat = of_get_property(node, "compatible", NULL);
245 if (!compat)
246 continue;
247
248 ret = sscanf(compat, "sdw%01x%04hx%04hx%02hhx", &sdw_version,
249 &id.mfg_id, &id.part_id, &id.class_id);
250
251 if (ret != 4) {
252 dev_err(dev, "Invalid compatible string found %s\n",
253 compat);
254 continue;
255 }
256
257 addr = of_get_property(node, "reg", &len);
258 if (!addr || (len < 2 * sizeof(u32))) {
259 dev_err(dev, "Invalid Link and Instance ID\n");
260 continue;
261 }
262
263 link_id = be32_to_cpup(addr++);
264 id.unique_id = be32_to_cpup(addr);
265 id.sdw_version = sdw_version;
266
267 /* Check for link_id match */
268 if (link_id != bus->link_id)
269 continue;
270
271 sdw_slave_add(bus, &id, of_fwnode_handle(node));
272 }
273
274 return 0;
275 }
276
of_sdw_find_device_by_node(struct device_node * np)277 struct device *of_sdw_find_device_by_node(struct device_node *np)
278 {
279 return bus_find_device_by_of_node(&sdw_bus_type, np);
280 }
281 EXPORT_SYMBOL_GPL(of_sdw_find_device_by_node);
282
283 MODULE_IMPORT_NS("SND_SOC_SDCA");
284