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