1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * HD audio Component Binding Interface
4 *
5 * Copyright (C) 2021, 2023 Cirrus Logic, Inc. and
6 * Cirrus Logic International Semiconductor Ltd.
7 */
8
9 #include <linux/acpi.h>
10 #include <linux/component.h>
11 #include <linux/module.h>
12 #include <linux/slab.h>
13 #include <sound/hda_codec.h>
14 #include "hda_component.h"
15 #include "hda_local.h"
16
17 #ifdef CONFIG_ACPI
hda_component_acpi_device_notify(struct hda_component_parent * parent,acpi_handle handle,u32 event,void * data)18 void hda_component_acpi_device_notify(struct hda_component_parent *parent,
19 acpi_handle handle, u32 event, void *data)
20 {
21 struct hda_component *comp;
22 int i;
23
24 mutex_lock(&parent->mutex);
25 for (i = 0; i < ARRAY_SIZE(parent->comps); i++) {
26 comp = hda_component_from_index(parent, i);
27 if (comp->dev && comp->acpi_notify)
28 comp->acpi_notify(acpi_device_handle(comp->adev), event, comp->dev);
29 }
30 mutex_unlock(&parent->mutex);
31 }
32 EXPORT_SYMBOL_NS_GPL(hda_component_acpi_device_notify, "SND_HDA_SCODEC_COMPONENT");
33
hda_component_manager_bind_acpi_notifications(struct hda_codec * cdc,struct hda_component_parent * parent,acpi_notify_handler handler,void * data)34 int hda_component_manager_bind_acpi_notifications(struct hda_codec *cdc,
35 struct hda_component_parent *parent,
36 acpi_notify_handler handler, void *data)
37 {
38 bool support_notifications = false;
39 struct acpi_device *adev;
40 struct hda_component *comp;
41 int ret;
42 int i;
43
44 adev = parent->comps[0].adev;
45 if (!acpi_device_handle(adev))
46 return 0;
47
48 for (i = 0; i < ARRAY_SIZE(parent->comps); i++) {
49 comp = hda_component_from_index(parent, i);
50 support_notifications = support_notifications ||
51 comp->acpi_notifications_supported;
52 }
53
54 if (support_notifications) {
55 ret = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
56 handler, data);
57 if (ret < 0) {
58 codec_warn(cdc, "Failed to install notify handler: %d\n", ret);
59 return 0;
60 }
61
62 codec_dbg(cdc, "Notify handler installed\n");
63 }
64
65 return 0;
66 }
67 EXPORT_SYMBOL_NS_GPL(hda_component_manager_bind_acpi_notifications, "SND_HDA_SCODEC_COMPONENT");
68
hda_component_manager_unbind_acpi_notifications(struct hda_codec * cdc,struct hda_component_parent * parent,acpi_notify_handler handler)69 void hda_component_manager_unbind_acpi_notifications(struct hda_codec *cdc,
70 struct hda_component_parent *parent,
71 acpi_notify_handler handler)
72 {
73 struct acpi_device *adev;
74 int ret;
75
76 adev = parent->comps[0].adev;
77 if (!acpi_device_handle(adev))
78 return;
79
80 ret = acpi_remove_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY, handler);
81 if (ret < 0)
82 codec_warn(cdc, "Failed to uninstall notify handler: %d\n", ret);
83 }
84 EXPORT_SYMBOL_NS_GPL(hda_component_manager_unbind_acpi_notifications, "SND_HDA_SCODEC_COMPONENT");
85 #endif /* ifdef CONFIG_ACPI */
86
hda_component_manager_playback_hook(struct hda_component_parent * parent,int action)87 void hda_component_manager_playback_hook(struct hda_component_parent *parent, int action)
88 {
89 struct hda_component *comp;
90 int i;
91
92 mutex_lock(&parent->mutex);
93 for (i = 0; i < ARRAY_SIZE(parent->comps); i++) {
94 comp = hda_component_from_index(parent, i);
95 if (comp->dev && comp->pre_playback_hook)
96 comp->pre_playback_hook(comp->dev, action);
97 }
98 for (i = 0; i < ARRAY_SIZE(parent->comps); i++) {
99 comp = hda_component_from_index(parent, i);
100 if (comp->dev && comp->playback_hook)
101 comp->playback_hook(comp->dev, action);
102 }
103 for (i = 0; i < ARRAY_SIZE(parent->comps); i++) {
104 comp = hda_component_from_index(parent, i);
105 if (comp->dev && comp->post_playback_hook)
106 comp->post_playback_hook(comp->dev, action);
107 }
108 mutex_unlock(&parent->mutex);
109 }
110 EXPORT_SYMBOL_NS_GPL(hda_component_manager_playback_hook, "SND_HDA_SCODEC_COMPONENT");
111
112 struct hda_scodec_match {
113 const char *bus;
114 const char *hid;
115 const char *match_str;
116 int index;
117 };
118
119 /* match the device name in a slightly relaxed manner */
hda_comp_match_dev_name(struct device * dev,void * data)120 static int hda_comp_match_dev_name(struct device *dev, void *data)
121 {
122 struct hda_scodec_match *p = data;
123 const char *d = dev_name(dev);
124 int n = strlen(p->bus);
125 char tmp[32];
126
127 /* check the bus name */
128 if (strncmp(d, p->bus, n))
129 return 0;
130 /* skip the bus number */
131 if (isdigit(d[n]))
132 n++;
133 /* the rest must be exact matching */
134 snprintf(tmp, sizeof(tmp), p->match_str, p->hid, p->index);
135 return !strcmp(d + n, tmp);
136 }
137
hda_component_manager_bind(struct hda_codec * cdc,struct hda_component_parent * parent)138 int hda_component_manager_bind(struct hda_codec *cdc,
139 struct hda_component_parent *parent)
140 {
141 int ret;
142
143 /* Init shared and component specific data */
144 memset(parent->comps, 0, sizeof(parent->comps));
145
146 mutex_lock(&parent->mutex);
147 ret = component_bind_all(hda_codec_dev(cdc), parent);
148 mutex_unlock(&parent->mutex);
149
150 return ret;
151 }
152 EXPORT_SYMBOL_NS_GPL(hda_component_manager_bind, "SND_HDA_SCODEC_COMPONENT");
153
hda_component_manager_init(struct hda_codec * cdc,struct hda_component_parent * parent,int count,const char * bus,const char * hid,const char * match_str,const struct component_master_ops * ops)154 int hda_component_manager_init(struct hda_codec *cdc,
155 struct hda_component_parent *parent, int count,
156 const char *bus, const char *hid,
157 const char *match_str,
158 const struct component_master_ops *ops)
159 {
160 struct device *dev = hda_codec_dev(cdc);
161 struct component_match *match = NULL;
162 struct hda_scodec_match *sm;
163 int ret, i;
164
165 if (parent->codec) {
166 codec_err(cdc, "Component binding already created (SSID: %x)\n",
167 cdc->core.subsystem_id);
168 return -EINVAL;
169 }
170 parent->codec = cdc;
171
172 mutex_init(&parent->mutex);
173
174 for (i = 0; i < count; i++) {
175 sm = devm_kmalloc(dev, sizeof(*sm), GFP_KERNEL);
176 if (!sm)
177 return -ENOMEM;
178
179 sm->bus = bus;
180 sm->hid = hid;
181 sm->match_str = match_str;
182 sm->index = i;
183 component_match_add(dev, &match, hda_comp_match_dev_name, sm);
184 }
185
186 ret = component_master_add_with_match(dev, ops, match);
187 if (ret)
188 codec_err(cdc, "Fail to register component aggregator %d\n", ret);
189
190 return ret;
191 }
192 EXPORT_SYMBOL_NS_GPL(hda_component_manager_init, "SND_HDA_SCODEC_COMPONENT");
193
hda_component_manager_free(struct hda_component_parent * parent,const struct component_master_ops * ops)194 void hda_component_manager_free(struct hda_component_parent *parent,
195 const struct component_master_ops *ops)
196 {
197 struct device *dev;
198
199 if (!parent->codec)
200 return;
201
202 dev = hda_codec_dev(parent->codec);
203
204 component_master_del(dev, ops);
205
206 parent->codec = NULL;
207 }
208 EXPORT_SYMBOL_NS_GPL(hda_component_manager_free, "SND_HDA_SCODEC_COMPONENT");
209
210 MODULE_DESCRIPTION("HD Audio component binding library");
211 MODULE_AUTHOR("Richard Fitzgerald <rf@opensource.cirrus.com>");
212 MODULE_LICENSE("GPL");
213