1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * sysfs support for HD-audio core device
4 */
5
6 #include <linux/slab.h>
7 #include <linux/sysfs.h>
8 #include <linux/device.h>
9 #include <sound/core.h>
10 #include <sound/hdaudio.h>
11 #include "local.h"
12
13 struct hdac_widget_tree {
14 struct kobject *root;
15 struct kobject *afg;
16 struct kobject **nodes;
17 };
18
19 #define CODEC_ATTR(type) \
20 static ssize_t type##_show(struct device *dev, \
21 struct device_attribute *attr, \
22 char *buf) \
23 { \
24 struct hdac_device *codec = dev_to_hdac_dev(dev); \
25 return sysfs_emit(buf, "0x%x\n", codec->type); \
26 } \
27 static DEVICE_ATTR_RO(type)
28
29 #define CODEC_ATTR_STR(type) \
30 static ssize_t type##_show(struct device *dev, \
31 struct device_attribute *attr, \
32 char *buf) \
33 { \
34 struct hdac_device *codec = dev_to_hdac_dev(dev); \
35 return sysfs_emit(buf, "%s\n", \
36 codec->type ? codec->type : ""); \
37 } \
38 static DEVICE_ATTR_RO(type)
39
40 CODEC_ATTR(type);
41 CODEC_ATTR(vendor_id);
42 CODEC_ATTR(subsystem_id);
43 CODEC_ATTR(revision_id);
44 CODEC_ATTR(afg);
45 CODEC_ATTR(mfg);
46 CODEC_ATTR_STR(vendor_name);
47 CODEC_ATTR_STR(chip_name);
48
49 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
50 char *buf)
51 {
52 return snd_hdac_codec_modalias(dev_to_hdac_dev(dev), buf, 256);
53 }
54 static DEVICE_ATTR_RO(modalias);
55
56 static struct attribute *hdac_dev_attrs[] = {
57 &dev_attr_type.attr,
58 &dev_attr_vendor_id.attr,
59 &dev_attr_subsystem_id.attr,
60 &dev_attr_revision_id.attr,
61 &dev_attr_afg.attr,
62 &dev_attr_mfg.attr,
63 &dev_attr_vendor_name.attr,
64 &dev_attr_chip_name.attr,
65 &dev_attr_modalias.attr,
66 NULL
67 };
68
69 static const struct attribute_group hdac_dev_attr_group = {
70 .attrs = hdac_dev_attrs,
71 };
72
73 const struct attribute_group *hdac_dev_attr_groups[] = {
74 &hdac_dev_attr_group,
75 NULL
76 };
77
78 /*
79 * Widget tree sysfs
80 *
81 * This is a tree showing the attributes of each widget. It appears like
82 * /sys/bus/hdaudioC0D0/widgets/04/caps
83 */
84
85 struct widget_attribute;
86
87 struct widget_attribute {
88 struct attribute attr;
89 ssize_t (*show)(struct hdac_device *codec, hda_nid_t nid,
90 struct widget_attribute *attr, char *buf);
91 ssize_t (*store)(struct hdac_device *codec, hda_nid_t nid,
92 struct widget_attribute *attr,
93 const char *buf, size_t count);
94 };
95
96 static int get_codec_nid(struct kobject *kobj, struct hdac_device **codecp)
97 {
98 struct device *dev = kobj_to_dev(kobj->parent->parent);
99 int nid;
100 ssize_t ret;
101
102 ret = kstrtoint(kobj->name, 16, &nid);
103 if (ret < 0)
104 return ret;
105 *codecp = dev_to_hdac_dev(dev);
106 return nid;
107 }
108
109 static ssize_t widget_attr_show(struct kobject *kobj, struct attribute *attr,
110 char *buf)
111 {
112 struct widget_attribute *wid_attr =
113 container_of(attr, struct widget_attribute, attr);
114 struct hdac_device *codec;
115 int nid;
116
117 if (!wid_attr->show)
118 return -EIO;
119 nid = get_codec_nid(kobj, &codec);
120 if (nid < 0)
121 return nid;
122 return wid_attr->show(codec, nid, wid_attr, buf);
123 }
124
125 static ssize_t widget_attr_store(struct kobject *kobj, struct attribute *attr,
126 const char *buf, size_t count)
127 {
128 struct widget_attribute *wid_attr =
129 container_of(attr, struct widget_attribute, attr);
130 struct hdac_device *codec;
131 int nid;
132
133 if (!wid_attr->store)
134 return -EIO;
135 nid = get_codec_nid(kobj, &codec);
136 if (nid < 0)
137 return nid;
138 return wid_attr->store(codec, nid, wid_attr, buf, count);
139 }
140
141 static const struct sysfs_ops widget_sysfs_ops = {
142 .show = widget_attr_show,
143 .store = widget_attr_store,
144 };
145
146 static void widget_release(struct kobject *kobj)
147 {
148 kfree(kobj);
149 }
150
151 static const struct kobj_type widget_ktype = {
152 .release = widget_release,
153 .sysfs_ops = &widget_sysfs_ops,
154 };
155
156 #define WIDGET_ATTR_RO(_name) \
157 struct widget_attribute wid_attr_##_name = __ATTR_RO(_name)
158 #define WIDGET_ATTR_RW(_name) \
159 struct widget_attribute wid_attr_##_name = __ATTR_RW(_name)
160
161 static ssize_t caps_show(struct hdac_device *codec, hda_nid_t nid,
162 struct widget_attribute *attr, char *buf)
163 {
164 return sysfs_emit(buf, "0x%08x\n", get_wcaps(codec, nid));
165 }
166
167 static ssize_t pin_caps_show(struct hdac_device *codec, hda_nid_t nid,
168 struct widget_attribute *attr, char *buf)
169 {
170 if (get_wcaps_type(get_wcaps(codec, nid)) != AC_WID_PIN)
171 return 0;
172 return sysfs_emit(buf, "0x%08x\n",
173 snd_hdac_read_parm(codec, nid, AC_PAR_PIN_CAP));
174 }
175
176 static ssize_t pin_cfg_show(struct hdac_device *codec, hda_nid_t nid,
177 struct widget_attribute *attr, char *buf)
178 {
179 unsigned int val;
180
181 if (get_wcaps_type(get_wcaps(codec, nid)) != AC_WID_PIN)
182 return 0;
183 if (snd_hdac_read(codec, nid, AC_VERB_GET_CONFIG_DEFAULT, 0, &val))
184 return 0;
185 return sysfs_emit(buf, "0x%08x\n", val);
186 }
187
188 static bool has_pcm_cap(struct hdac_device *codec, hda_nid_t nid)
189 {
190 if (nid == codec->afg || nid == codec->mfg)
191 return true;
192 switch (get_wcaps_type(get_wcaps(codec, nid))) {
193 case AC_WID_AUD_OUT:
194 case AC_WID_AUD_IN:
195 return true;
196 default:
197 return false;
198 }
199 }
200
201 static ssize_t pcm_caps_show(struct hdac_device *codec, hda_nid_t nid,
202 struct widget_attribute *attr, char *buf)
203 {
204 if (!has_pcm_cap(codec, nid))
205 return 0;
206 return sysfs_emit(buf, "0x%08x\n",
207 snd_hdac_read_parm(codec, nid, AC_PAR_PCM));
208 }
209
210 static ssize_t pcm_formats_show(struct hdac_device *codec, hda_nid_t nid,
211 struct widget_attribute *attr, char *buf)
212 {
213 if (!has_pcm_cap(codec, nid))
214 return 0;
215 return sysfs_emit(buf, "0x%08x\n",
216 snd_hdac_read_parm(codec, nid, AC_PAR_STREAM));
217 }
218
219 static ssize_t amp_in_caps_show(struct hdac_device *codec, hda_nid_t nid,
220 struct widget_attribute *attr, char *buf)
221 {
222 if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_IN_AMP))
223 return 0;
224 return sysfs_emit(buf, "0x%08x\n",
225 snd_hdac_read_parm(codec, nid, AC_PAR_AMP_IN_CAP));
226 }
227
228 static ssize_t amp_out_caps_show(struct hdac_device *codec, hda_nid_t nid,
229 struct widget_attribute *attr, char *buf)
230 {
231 if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_OUT_AMP))
232 return 0;
233 return sysfs_emit(buf, "0x%08x\n",
234 snd_hdac_read_parm(codec, nid, AC_PAR_AMP_OUT_CAP));
235 }
236
237 static ssize_t power_caps_show(struct hdac_device *codec, hda_nid_t nid,
238 struct widget_attribute *attr, char *buf)
239 {
240 if (nid != codec->afg && !(get_wcaps(codec, nid) & AC_WCAP_POWER))
241 return 0;
242 return sysfs_emit(buf, "0x%08x\n",
243 snd_hdac_read_parm(codec, nid, AC_PAR_POWER_STATE));
244 }
245
246 static ssize_t gpio_caps_show(struct hdac_device *codec, hda_nid_t nid,
247 struct widget_attribute *attr, char *buf)
248 {
249 return sysfs_emit(buf, "0x%08x\n",
250 snd_hdac_read_parm(codec, nid, AC_PAR_GPIO_CAP));
251 }
252
253 static ssize_t connections_show(struct hdac_device *codec, hda_nid_t nid,
254 struct widget_attribute *attr, char *buf)
255 {
256 hda_nid_t list[32];
257 int i, nconns;
258 ssize_t ret = 0;
259
260 nconns = snd_hdac_get_connections(codec, nid, list, ARRAY_SIZE(list));
261 if (nconns <= 0)
262 return nconns;
263 for (i = 0; i < nconns; i++)
264 ret += sysfs_emit_at(buf, ret, "%s0x%02x", i ? " " : "", list[i]);
265 ret += sysfs_emit_at(buf, ret, "\n");
266 return ret;
267 }
268
269 static WIDGET_ATTR_RO(caps);
270 static WIDGET_ATTR_RO(pin_caps);
271 static WIDGET_ATTR_RO(pin_cfg);
272 static WIDGET_ATTR_RO(pcm_caps);
273 static WIDGET_ATTR_RO(pcm_formats);
274 static WIDGET_ATTR_RO(amp_in_caps);
275 static WIDGET_ATTR_RO(amp_out_caps);
276 static WIDGET_ATTR_RO(power_caps);
277 static WIDGET_ATTR_RO(gpio_caps);
278 static WIDGET_ATTR_RO(connections);
279
280 static struct attribute *widget_node_attrs[] = {
281 &wid_attr_caps.attr,
282 &wid_attr_pin_caps.attr,
283 &wid_attr_pin_cfg.attr,
284 &wid_attr_pcm_caps.attr,
285 &wid_attr_pcm_formats.attr,
286 &wid_attr_amp_in_caps.attr,
287 &wid_attr_amp_out_caps.attr,
288 &wid_attr_power_caps.attr,
289 &wid_attr_connections.attr,
290 NULL,
291 };
292
293 static struct attribute *widget_afg_attrs[] = {
294 &wid_attr_pcm_caps.attr,
295 &wid_attr_pcm_formats.attr,
296 &wid_attr_amp_in_caps.attr,
297 &wid_attr_amp_out_caps.attr,
298 &wid_attr_power_caps.attr,
299 &wid_attr_gpio_caps.attr,
300 NULL,
301 };
302
303 static const struct attribute_group widget_node_group = {
304 .attrs = widget_node_attrs,
305 };
306
307 static const struct attribute_group widget_afg_group = {
308 .attrs = widget_afg_attrs,
309 };
310
311 static void free_widget_node(struct kobject *kobj,
312 const struct attribute_group *group)
313 {
314 if (kobj) {
315 sysfs_remove_group(kobj, group);
316 kobject_put(kobj);
317 }
318 }
319
320 static void widget_tree_free(struct hdac_device *codec)
321 {
322 struct hdac_widget_tree *tree = codec->widgets;
323 struct kobject **p;
324
325 if (!tree)
326 return;
327 free_widget_node(tree->afg, &widget_afg_group);
328 if (tree->nodes) {
329 for (p = tree->nodes; *p; p++)
330 free_widget_node(*p, &widget_node_group);
331 kfree(tree->nodes);
332 }
333 kobject_put(tree->root);
334 kfree(tree);
335 codec->widgets = NULL;
336 }
337
338 static int add_widget_node(struct kobject *parent, hda_nid_t nid,
339 const struct attribute_group *group,
340 struct kobject **res)
341 {
342 struct kobject *kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
343 int err;
344
345 if (!kobj)
346 return -ENOMEM;
347 kobject_init(kobj, &widget_ktype);
348 err = kobject_add(kobj, parent, "%02x", nid);
349 if (err < 0) {
350 kobject_put(kobj);
351 return err;
352 }
353 err = sysfs_create_group(kobj, group);
354 if (err < 0) {
355 kobject_put(kobj);
356 return err;
357 }
358
359 *res = kobj;
360 return 0;
361 }
362
363 static int widget_tree_create(struct hdac_device *codec)
364 {
365 struct hdac_widget_tree *tree;
366 int i, err;
367 hda_nid_t nid;
368
369 tree = codec->widgets = kzalloc(sizeof(*tree), GFP_KERNEL);
370 if (!tree)
371 return -ENOMEM;
372
373 tree->root = kobject_create_and_add("widgets", &codec->dev.kobj);
374 if (!tree->root)
375 return -ENOMEM;
376
377 tree->nodes = kcalloc(codec->num_nodes + 1, sizeof(*tree->nodes),
378 GFP_KERNEL);
379 if (!tree->nodes)
380 return -ENOMEM;
381
382 for (i = 0, nid = codec->start_nid; i < codec->num_nodes; i++, nid++) {
383 err = add_widget_node(tree->root, nid, &widget_node_group,
384 &tree->nodes[i]);
385 if (err < 0)
386 return err;
387 }
388
389 if (codec->afg) {
390 err = add_widget_node(tree->root, codec->afg,
391 &widget_afg_group, &tree->afg);
392 if (err < 0)
393 return err;
394 }
395
396 kobject_uevent(tree->root, KOBJ_CHANGE);
397 return 0;
398 }
399
400 /* call with codec->widget_lock held */
401 int hda_widget_sysfs_init(struct hdac_device *codec)
402 {
403 int err;
404
405 if (codec->widgets)
406 return 0; /* already created */
407
408 err = widget_tree_create(codec);
409 if (err < 0) {
410 widget_tree_free(codec);
411 return err;
412 }
413
414 return 0;
415 }
416
417 /* call with codec->widget_lock held */
418 void hda_widget_sysfs_exit(struct hdac_device *codec)
419 {
420 widget_tree_free(codec);
421 }
422
423 /* call with codec->widget_lock held */
424 int hda_widget_sysfs_reinit(struct hdac_device *codec,
425 hda_nid_t start_nid, int num_nodes)
426 {
427 struct hdac_widget_tree *tree;
428 hda_nid_t end_nid = start_nid + num_nodes;
429 hda_nid_t nid;
430 int i;
431
432 if (!codec->widgets)
433 return 0;
434
435 tree = kmemdup(codec->widgets, sizeof(*tree), GFP_KERNEL);
436 if (!tree)
437 return -ENOMEM;
438
439 tree->nodes = kcalloc(num_nodes + 1, sizeof(*tree->nodes), GFP_KERNEL);
440 if (!tree->nodes) {
441 kfree(tree);
442 return -ENOMEM;
443 }
444
445 /* prune non-existing nodes */
446 for (i = 0, nid = codec->start_nid; i < codec->num_nodes; i++, nid++) {
447 if (nid < start_nid || nid >= end_nid)
448 free_widget_node(codec->widgets->nodes[i],
449 &widget_node_group);
450 }
451
452 /* add new nodes */
453 for (i = 0, nid = start_nid; i < num_nodes; i++, nid++) {
454 if (nid < codec->start_nid || nid >= codec->end_nid)
455 add_widget_node(tree->root, nid, &widget_node_group,
456 &tree->nodes[i]);
457 else
458 tree->nodes[i] =
459 codec->widgets->nodes[nid - codec->start_nid];
460 }
461
462 /* replace with the new tree */
463 kfree(codec->widgets->nodes);
464 kfree(codec->widgets);
465 codec->widgets = tree;
466
467 kobject_uevent(tree->root, KOBJ_CHANGE);
468 return 0;
469 }
470
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.