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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 "bus.h"
9
10static void sdw_slave_release(struct device *dev)
11{
12 struct sdw_slave *slave = dev_to_sdw_dev(dev);
13
14 kfree(slave);
15}
16
17struct device_type sdw_slave_type = {
18 .name = "sdw_slave",
19 .release = sdw_slave_release,
20 .uevent = sdw_slave_uevent,
21};
22
23static int sdw_slave_add(struct sdw_bus *bus,
24 struct sdw_slave_id *id, struct fwnode_handle *fwnode)
25{
26 struct sdw_slave *slave;
27 int ret;
28
29 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
30 if (!slave)
31 return -ENOMEM;
32
33 /* Initialize data structure */
34 memcpy(&slave->id, id, sizeof(*id));
35 slave->dev.parent = bus->dev;
36 slave->dev.fwnode = fwnode;
37
38 if (id->unique_id == SDW_IGNORED_UNIQUE_ID) {
39 /* name shall be sdw:link:mfg:part:class */
40 dev_set_name(&slave->dev, "sdw:%x:%x:%x:%x",
41 bus->link_id, id->mfg_id, id->part_id,
42 id->class_id);
43 } else {
44 /* name shall be sdw:link:mfg:part:class:unique */
45 dev_set_name(&slave->dev, "sdw:%x:%x:%x:%x:%x",
46 bus->link_id, id->mfg_id, id->part_id,
47 id->class_id, id->unique_id);
48 }
49
50 slave->dev.bus = &sdw_bus_type;
51 slave->dev.of_node = of_node_get(to_of_node(fwnode));
52 slave->dev.type = &sdw_slave_type;
53 slave->bus = bus;
54 slave->status = SDW_SLAVE_UNATTACHED;
55 init_completion(&slave->enumeration_complete);
56 init_completion(&slave->initialization_complete);
57 slave->dev_num = 0;
58 init_completion(&slave->probe_complete);
59 slave->probed = false;
60
61 mutex_lock(&bus->bus_lock);
62 list_add_tail(&slave->node, &bus->slaves);
63 mutex_unlock(&bus->bus_lock);
64
65 ret = device_register(&slave->dev);
66 if (ret) {
67 dev_err(bus->dev, "Failed to add slave: ret %d\n", ret);
68
69 /*
70 * On err, don't free but drop ref as this will be freed
71 * when release method is invoked.
72 */
73 mutex_lock(&bus->bus_lock);
74 list_del(&slave->node);
75 mutex_unlock(&bus->bus_lock);
76 put_device(&slave->dev);
77
78 return ret;
79 }
80 sdw_slave_debugfs_init(slave);
81
82 return ret;
83}
84
85#if IS_ENABLED(CONFIG_ACPI)
86
87static bool find_slave(struct sdw_bus *bus,
88 struct acpi_device *adev,
89 struct sdw_slave_id *id)
90{
91 unsigned long long addr;
92 unsigned int link_id;
93 acpi_status status;
94
95 status = acpi_evaluate_integer(adev->handle,
96 METHOD_NAME__ADR, NULL, &addr);
97
98 if (ACPI_FAILURE(status)) {
99 dev_err(bus->dev, "_ADR resolution failed: %x\n",
100 status);
101 return false;
102 }
103
104 /* Extract link id from ADR, Bit 51 to 48 (included) */
105 link_id = (addr >> 48) & GENMASK(3, 0);
106
107 /* Check for link_id match */
108 if (link_id != bus->link_id)
109 return false;
110
111 sdw_extract_slave_id(bus, addr, id);
112
113 return true;
114}
115
116/*
117 * sdw_acpi_find_slaves() - Find Slave devices in Master ACPI node
118 * @bus: SDW bus instance
119 *
120 * Scans Master ACPI node for SDW child Slave devices and registers it.
121 */
122int sdw_acpi_find_slaves(struct sdw_bus *bus)
123{
124 struct acpi_device *adev, *parent;
125 struct acpi_device *adev2, *parent2;
126
127 parent = ACPI_COMPANION(bus->dev);
128 if (!parent) {
129 dev_err(bus->dev, "Can't find parent for acpi bind\n");
130 return -ENODEV;
131 }
132
133 list_for_each_entry(adev, &parent->children, node) {
134 struct sdw_slave_id id;
135 struct sdw_slave_id id2;
136 bool ignore_unique_id = true;
137
138 if (!find_slave(bus, adev, &id))
139 continue;
140
141 /* brute-force O(N^2) search for duplicates */
142 parent2 = parent;
143 list_for_each_entry(adev2, &parent2->children, node) {
144
145 if (adev == adev2)
146 continue;
147
148 if (!find_slave(bus, adev2, &id2))
149 continue;
150
151 if (id.sdw_version != id2.sdw_version ||
152 id.mfg_id != id2.mfg_id ||
153 id.part_id != id2.part_id ||
154 id.class_id != id2.class_id)
155 continue;
156
157 if (id.unique_id != id2.unique_id) {
158 dev_dbg(bus->dev,
159 "Valid unique IDs %x %x for Slave mfg %x part %d\n",
160 id.unique_id, id2.unique_id,
161 id.mfg_id, id.part_id);
162 ignore_unique_id = false;
163 } else {
164 dev_err(bus->dev,
165 "Invalid unique IDs %x %x for Slave mfg %x part %d\n",
166 id.unique_id, id2.unique_id,
167 id.mfg_id, id.part_id);
168 return -ENODEV;
169 }
170 }
171
172 if (ignore_unique_id)
173 id.unique_id = SDW_IGNORED_UNIQUE_ID;
174
175 /*
176 * don't error check for sdw_slave_add as we want to continue
177 * adding Slaves
178 */
179 sdw_slave_add(bus, &id, acpi_fwnode_handle(adev));
180 }
181
182 return 0;
183}
184
185#endif
186
187/*
188 * sdw_of_find_slaves() - Find Slave devices in master device tree node
189 * @bus: SDW bus instance
190 *
191 * Scans Master DT node for SDW child Slave devices and registers it.
192 */
193int sdw_of_find_slaves(struct sdw_bus *bus)
194{
195 struct device *dev = bus->dev;
196 struct device_node *node;
197
198 for_each_child_of_node(bus->dev->of_node, node) {
199 int link_id, ret, len;
200 unsigned int sdw_version;
201 const char *compat = NULL;
202 struct sdw_slave_id id;
203 const __be32 *addr;
204
205 compat = of_get_property(node, "compatible", NULL);
206 if (!compat)
207 continue;
208
209 ret = sscanf(compat, "sdw%01x%04hx%04hx%02hhx", &sdw_version,
210 &id.mfg_id, &id.part_id, &id.class_id);
211
212 if (ret != 4) {
213 dev_err(dev, "Invalid compatible string found %s\n",
214 compat);
215 continue;
216 }
217
218 addr = of_get_property(node, "reg", &len);
219 if (!addr || (len < 2 * sizeof(u32))) {
220 dev_err(dev, "Invalid Link and Instance ID\n");
221 continue;
222 }
223
224 link_id = be32_to_cpup(addr++);
225 id.unique_id = be32_to_cpup(addr);
226 id.sdw_version = sdw_version;
227
228 /* Check for link_id match */
229 if (link_id != bus->link_id)
230 continue;
231
232 sdw_slave_add(bus, &id, of_fwnode_handle(node));
233 }
234
235 return 0;
236}
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 "bus.h"
9#include "sysfs_local.h"
10
11static void sdw_slave_release(struct device *dev)
12{
13 struct sdw_slave *slave = dev_to_sdw_dev(dev);
14
15 kfree(slave);
16}
17
18struct device_type sdw_slave_type = {
19 .name = "sdw_slave",
20 .release = sdw_slave_release,
21 .uevent = sdw_slave_uevent,
22};
23
24int sdw_slave_add(struct sdw_bus *bus,
25 struct sdw_slave_id *id, struct fwnode_handle *fwnode)
26{
27 struct sdw_slave *slave;
28 int ret;
29 int i;
30
31 slave = kzalloc(sizeof(*slave), GFP_KERNEL);
32 if (!slave)
33 return -ENOMEM;
34
35 /* Initialize data structure */
36 memcpy(&slave->id, id, sizeof(*id));
37 slave->dev.parent = bus->dev;
38 slave->dev.fwnode = fwnode;
39
40 if (id->unique_id == SDW_IGNORED_UNIQUE_ID) {
41 /* name shall be sdw:link:mfg:part:class */
42 dev_set_name(&slave->dev, "sdw:%01x:%04x:%04x:%02x",
43 bus->link_id, id->mfg_id, id->part_id,
44 id->class_id);
45 } else {
46 /* name shall be sdw:link:mfg:part:class:unique */
47 dev_set_name(&slave->dev, "sdw:%01x:%04x:%04x:%02x:%01x",
48 bus->link_id, id->mfg_id, id->part_id,
49 id->class_id, id->unique_id);
50 }
51
52 slave->dev.bus = &sdw_bus_type;
53 slave->dev.of_node = of_node_get(to_of_node(fwnode));
54 slave->dev.type = &sdw_slave_type;
55 slave->dev.groups = sdw_slave_status_attr_groups;
56 slave->bus = bus;
57 slave->status = SDW_SLAVE_UNATTACHED;
58 init_completion(&slave->enumeration_complete);
59 init_completion(&slave->initialization_complete);
60 slave->dev_num = 0;
61 init_completion(&slave->probe_complete);
62 slave->probed = false;
63 slave->first_interrupt_done = false;
64
65 for (i = 0; i < SDW_MAX_PORTS; i++)
66 init_completion(&slave->port_ready[i]);
67
68 mutex_lock(&bus->bus_lock);
69 list_add_tail(&slave->node, &bus->slaves);
70 mutex_unlock(&bus->bus_lock);
71
72 ret = device_register(&slave->dev);
73 if (ret) {
74 dev_err(bus->dev, "Failed to add slave: ret %d\n", ret);
75
76 /*
77 * On err, don't free but drop ref as this will be freed
78 * when release method is invoked.
79 */
80 mutex_lock(&bus->bus_lock);
81 list_del(&slave->node);
82 mutex_unlock(&bus->bus_lock);
83 put_device(&slave->dev);
84
85 return ret;
86 }
87 sdw_slave_debugfs_init(slave);
88
89 return ret;
90}
91EXPORT_SYMBOL(sdw_slave_add);
92
93#if IS_ENABLED(CONFIG_ACPI)
94
95static bool find_slave(struct sdw_bus *bus,
96 struct acpi_device *adev,
97 struct sdw_slave_id *id)
98{
99 u64 addr;
100 unsigned int link_id;
101 acpi_status status;
102
103 status = acpi_evaluate_integer(adev->handle,
104 METHOD_NAME__ADR, NULL, &addr);
105
106 if (ACPI_FAILURE(status)) {
107 dev_err(bus->dev, "_ADR resolution failed: %x\n",
108 status);
109 return false;
110 }
111
112 if (bus->ops->override_adr)
113 addr = bus->ops->override_adr(bus, addr);
114
115 if (!addr)
116 return false;
117
118 /* Extract link id from ADR, Bit 51 to 48 (included) */
119 link_id = SDW_DISCO_LINK_ID(addr);
120
121 /* Check for link_id match */
122 if (link_id != bus->link_id)
123 return false;
124
125 sdw_extract_slave_id(bus, addr, id);
126
127 return true;
128}
129
130/*
131 * sdw_acpi_find_slaves() - Find Slave devices in Master ACPI node
132 * @bus: SDW bus instance
133 *
134 * Scans Master ACPI node for SDW child Slave devices and registers it.
135 */
136int sdw_acpi_find_slaves(struct sdw_bus *bus)
137{
138 struct acpi_device *adev, *parent;
139 struct acpi_device *adev2, *parent2;
140
141 parent = ACPI_COMPANION(bus->dev);
142 if (!parent) {
143 dev_err(bus->dev, "Can't find parent for acpi bind\n");
144 return -ENODEV;
145 }
146
147 list_for_each_entry(adev, &parent->children, node) {
148 struct sdw_slave_id id;
149 struct sdw_slave_id id2;
150 bool ignore_unique_id = true;
151
152 if (!find_slave(bus, adev, &id))
153 continue;
154
155 /* brute-force O(N^2) search for duplicates */
156 parent2 = parent;
157 list_for_each_entry(adev2, &parent2->children, node) {
158
159 if (adev == adev2)
160 continue;
161
162 if (!find_slave(bus, adev2, &id2))
163 continue;
164
165 if (id.sdw_version != id2.sdw_version ||
166 id.mfg_id != id2.mfg_id ||
167 id.part_id != id2.part_id ||
168 id.class_id != id2.class_id)
169 continue;
170
171 if (id.unique_id != id2.unique_id) {
172 dev_dbg(bus->dev,
173 "Valid unique IDs 0x%x 0x%x for Slave mfg_id 0x%04x, part_id 0x%04x\n",
174 id.unique_id, id2.unique_id, id.mfg_id, id.part_id);
175 ignore_unique_id = false;
176 } else {
177 dev_err(bus->dev,
178 "Invalid unique IDs 0x%x 0x%x for Slave mfg_id 0x%04x, part_id 0x%04x\n",
179 id.unique_id, id2.unique_id, id.mfg_id, id.part_id);
180 return -ENODEV;
181 }
182 }
183
184 if (ignore_unique_id)
185 id.unique_id = SDW_IGNORED_UNIQUE_ID;
186
187 /*
188 * don't error check for sdw_slave_add as we want to continue
189 * adding Slaves
190 */
191 sdw_slave_add(bus, &id, acpi_fwnode_handle(adev));
192 }
193
194 return 0;
195}
196
197#endif
198
199/*
200 * sdw_of_find_slaves() - Find Slave devices in master device tree node
201 * @bus: SDW bus instance
202 *
203 * Scans Master DT node for SDW child Slave devices and registers it.
204 */
205int sdw_of_find_slaves(struct sdw_bus *bus)
206{
207 struct device *dev = bus->dev;
208 struct device_node *node;
209
210 for_each_child_of_node(bus->dev->of_node, node) {
211 int link_id, ret, len;
212 unsigned int sdw_version;
213 const char *compat = NULL;
214 struct sdw_slave_id id;
215 const __be32 *addr;
216
217 compat = of_get_property(node, "compatible", NULL);
218 if (!compat)
219 continue;
220
221 ret = sscanf(compat, "sdw%01x%04hx%04hx%02hhx", &sdw_version,
222 &id.mfg_id, &id.part_id, &id.class_id);
223
224 if (ret != 4) {
225 dev_err(dev, "Invalid compatible string found %s\n",
226 compat);
227 continue;
228 }
229
230 addr = of_get_property(node, "reg", &len);
231 if (!addr || (len < 2 * sizeof(u32))) {
232 dev_err(dev, "Invalid Link and Instance ID\n");
233 continue;
234 }
235
236 link_id = be32_to_cpup(addr++);
237 id.unique_id = be32_to_cpup(addr);
238 id.sdw_version = sdw_version;
239
240 /* Check for link_id match */
241 if (link_id != bus->link_id)
242 continue;
243
244 sdw_slave_add(bus, &id, of_fwnode_handle(node));
245 }
246
247 return 0;
248}