This source file includes following definitions.
- to_ac97_controller
- ac97_unbound_ctrl_write
- ac97_unbound_ctrl_read
- ac97_codec_find
- ac97_of_get_child_device
- ac97_codec_release
- ac97_codec_add
- snd_ac97_bus_scan_one
- ac97_bus_scan
- ac97_bus_reset
- snd_ac97_codec_driver_register
- snd_ac97_codec_driver_unregister
- snd_ac97_codec_get_platdata
- ac97_ctrl_codecs_unregister
- cold_reset_store
- warm_reset_store
- ac97_del_adapter
- ac97_adapter_release
- ac97_add_adapter
- snd_ac97_controller_register
- snd_ac97_controller_unregister
- ac97_pm_runtime_suspend
- ac97_pm_runtime_resume
- ac97_get_enable_clk
- ac97_put_disable_clk
- vendor_id_show
- ac97_bus_match
- ac97_bus_probe
- ac97_bus_remove
- ac97_bus_init
- ac97_bus_exit
1
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5
6 #include <linux/module.h>
7 #include <linux/bitops.h>
8 #include <linux/clk.h>
9 #include <linux/device.h>
10 #include <linux/idr.h>
11 #include <linux/list.h>
12 #include <linux/mutex.h>
13 #include <linux/of.h>
14 #include <linux/pm.h>
15 #include <linux/pm_runtime.h>
16 #include <linux/slab.h>
17 #include <linux/sysfs.h>
18 #include <sound/ac97/codec.h>
19 #include <sound/ac97/controller.h>
20 #include <sound/ac97/regs.h>
21
22 #include "ac97_core.h"
23
24
25
26
27 static DEFINE_MUTEX(ac97_controllers_mutex);
28 static DEFINE_IDR(ac97_adapter_idr);
29 static LIST_HEAD(ac97_controllers);
30
31 static struct bus_type ac97_bus_type;
32
33 static inline struct ac97_controller*
34 to_ac97_controller(struct device *ac97_adapter)
35 {
36 return container_of(ac97_adapter, struct ac97_controller, adap);
37 }
38
39 static int ac97_unbound_ctrl_write(struct ac97_controller *adrv, int slot,
40 unsigned short reg, unsigned short val)
41 {
42 return -ENODEV;
43 }
44
45 static int ac97_unbound_ctrl_read(struct ac97_controller *adrv, int slot,
46 unsigned short reg)
47 {
48 return -ENODEV;
49 }
50
51 static const struct ac97_controller_ops ac97_unbound_ctrl_ops = {
52 .write = ac97_unbound_ctrl_write,
53 .read = ac97_unbound_ctrl_read,
54 };
55
56 static struct ac97_controller ac97_unbound_ctrl = {
57 .ops = &ac97_unbound_ctrl_ops,
58 };
59
60 static struct ac97_codec_device *
61 ac97_codec_find(struct ac97_controller *ac97_ctrl, unsigned int codec_num)
62 {
63 if (codec_num >= AC97_BUS_MAX_CODECS)
64 return ERR_PTR(-EINVAL);
65
66 return ac97_ctrl->codecs[codec_num];
67 }
68
69 static struct device_node *
70 ac97_of_get_child_device(struct ac97_controller *ac97_ctrl, int idx,
71 unsigned int vendor_id)
72 {
73 struct device_node *node;
74 u32 reg;
75 char compat[] = "ac97,0000,0000";
76
77 snprintf(compat, sizeof(compat), "ac97,%04x,%04x",
78 vendor_id >> 16, vendor_id & 0xffff);
79
80 for_each_child_of_node(ac97_ctrl->parent->of_node, node) {
81 if ((idx != of_property_read_u32(node, "reg", ®)) ||
82 !of_device_is_compatible(node, compat))
83 continue;
84 return node;
85 }
86
87 return NULL;
88 }
89
90 static void ac97_codec_release(struct device *dev)
91 {
92 struct ac97_codec_device *adev;
93 struct ac97_controller *ac97_ctrl;
94
95 adev = to_ac97_device(dev);
96 ac97_ctrl = adev->ac97_ctrl;
97 ac97_ctrl->codecs[adev->num] = NULL;
98 of_node_put(dev->of_node);
99 kfree(adev);
100 }
101
102 static int ac97_codec_add(struct ac97_controller *ac97_ctrl, int idx,
103 unsigned int vendor_id)
104 {
105 struct ac97_codec_device *codec;
106 int ret;
107
108 codec = kzalloc(sizeof(*codec), GFP_KERNEL);
109 if (!codec)
110 return -ENOMEM;
111 ac97_ctrl->codecs[idx] = codec;
112 codec->vendor_id = vendor_id;
113 codec->dev.release = ac97_codec_release;
114 codec->dev.bus = &ac97_bus_type;
115 codec->dev.parent = &ac97_ctrl->adap;
116 codec->num = idx;
117 codec->ac97_ctrl = ac97_ctrl;
118
119 device_initialize(&codec->dev);
120 dev_set_name(&codec->dev, "%s:%u", dev_name(ac97_ctrl->parent), idx);
121 codec->dev.of_node = ac97_of_get_child_device(ac97_ctrl, idx,
122 vendor_id);
123
124 ret = device_add(&codec->dev);
125 if (ret) {
126 put_device(&codec->dev);
127 return ret;
128 }
129
130 return 0;
131 }
132
133 unsigned int snd_ac97_bus_scan_one(struct ac97_controller *adrv,
134 unsigned int codec_num)
135 {
136 unsigned short vid1, vid2;
137 int ret;
138
139 ret = adrv->ops->read(adrv, codec_num, AC97_VENDOR_ID1);
140 vid1 = (ret & 0xffff);
141 if (ret < 0)
142 return 0;
143
144 ret = adrv->ops->read(adrv, codec_num, AC97_VENDOR_ID2);
145 vid2 = (ret & 0xffff);
146 if (ret < 0)
147 return 0;
148
149 dev_dbg(&adrv->adap, "%s(codec_num=%u): vendor_id=0x%08x\n",
150 __func__, codec_num, AC97_ID(vid1, vid2));
151 return AC97_ID(vid1, vid2);
152 }
153
154 static int ac97_bus_scan(struct ac97_controller *ac97_ctrl)
155 {
156 int ret, i;
157 unsigned int vendor_id;
158
159 for (i = 0; i < AC97_BUS_MAX_CODECS; i++) {
160 if (ac97_codec_find(ac97_ctrl, i))
161 continue;
162 if (!(ac97_ctrl->slots_available & BIT(i)))
163 continue;
164 vendor_id = snd_ac97_bus_scan_one(ac97_ctrl, i);
165 if (!vendor_id)
166 continue;
167
168 ret = ac97_codec_add(ac97_ctrl, i, vendor_id);
169 if (ret < 0)
170 return ret;
171 }
172 return 0;
173 }
174
175 static int ac97_bus_reset(struct ac97_controller *ac97_ctrl)
176 {
177 ac97_ctrl->ops->reset(ac97_ctrl);
178
179 return 0;
180 }
181
182
183
184
185
186
187
188
189
190
191 int snd_ac97_codec_driver_register(struct ac97_codec_driver *drv)
192 {
193 drv->driver.bus = &ac97_bus_type;
194 return driver_register(&drv->driver);
195 }
196 EXPORT_SYMBOL_GPL(snd_ac97_codec_driver_register);
197
198
199
200
201
202
203
204 void snd_ac97_codec_driver_unregister(struct ac97_codec_driver *drv)
205 {
206 driver_unregister(&drv->driver);
207 }
208 EXPORT_SYMBOL_GPL(snd_ac97_codec_driver_unregister);
209
210
211
212
213
214
215
216
217
218
219
220 void *snd_ac97_codec_get_platdata(const struct ac97_codec_device *adev)
221 {
222 struct ac97_controller *ac97_ctrl = adev->ac97_ctrl;
223
224 return ac97_ctrl->codecs_pdata[adev->num];
225 }
226 EXPORT_SYMBOL_GPL(snd_ac97_codec_get_platdata);
227
228 static void ac97_ctrl_codecs_unregister(struct ac97_controller *ac97_ctrl)
229 {
230 int i;
231
232 for (i = 0; i < AC97_BUS_MAX_CODECS; i++)
233 if (ac97_ctrl->codecs[i]) {
234 ac97_ctrl->codecs[i]->ac97_ctrl = &ac97_unbound_ctrl;
235 device_unregister(&ac97_ctrl->codecs[i]->dev);
236 }
237 }
238
239 static ssize_t cold_reset_store(struct device *dev,
240 struct device_attribute *attr, const char *buf,
241 size_t len)
242 {
243 struct ac97_controller *ac97_ctrl;
244
245 mutex_lock(&ac97_controllers_mutex);
246 ac97_ctrl = to_ac97_controller(dev);
247 ac97_ctrl->ops->reset(ac97_ctrl);
248 mutex_unlock(&ac97_controllers_mutex);
249 return len;
250 }
251 static DEVICE_ATTR_WO(cold_reset);
252
253 static ssize_t warm_reset_store(struct device *dev,
254 struct device_attribute *attr, const char *buf,
255 size_t len)
256 {
257 struct ac97_controller *ac97_ctrl;
258
259 if (!dev)
260 return -ENODEV;
261
262 mutex_lock(&ac97_controllers_mutex);
263 ac97_ctrl = to_ac97_controller(dev);
264 ac97_ctrl->ops->warm_reset(ac97_ctrl);
265 mutex_unlock(&ac97_controllers_mutex);
266 return len;
267 }
268 static DEVICE_ATTR_WO(warm_reset);
269
270 static struct attribute *ac97_controller_device_attrs[] = {
271 &dev_attr_cold_reset.attr,
272 &dev_attr_warm_reset.attr,
273 NULL
274 };
275
276 static struct attribute_group ac97_adapter_attr_group = {
277 .name = "ac97_operations",
278 .attrs = ac97_controller_device_attrs,
279 };
280
281 static const struct attribute_group *ac97_adapter_groups[] = {
282 &ac97_adapter_attr_group,
283 NULL,
284 };
285
286 static void ac97_del_adapter(struct ac97_controller *ac97_ctrl)
287 {
288 mutex_lock(&ac97_controllers_mutex);
289 ac97_ctrl_codecs_unregister(ac97_ctrl);
290 list_del(&ac97_ctrl->controllers);
291 mutex_unlock(&ac97_controllers_mutex);
292
293 device_unregister(&ac97_ctrl->adap);
294 }
295
296 static void ac97_adapter_release(struct device *dev)
297 {
298 struct ac97_controller *ac97_ctrl;
299
300 ac97_ctrl = to_ac97_controller(dev);
301 idr_remove(&ac97_adapter_idr, ac97_ctrl->nr);
302 dev_dbg(&ac97_ctrl->adap, "adapter unregistered by %s\n",
303 dev_name(ac97_ctrl->parent));
304 }
305
306 static const struct device_type ac97_adapter_type = {
307 .groups = ac97_adapter_groups,
308 .release = ac97_adapter_release,
309 };
310
311 static int ac97_add_adapter(struct ac97_controller *ac97_ctrl)
312 {
313 int ret;
314
315 mutex_lock(&ac97_controllers_mutex);
316 ret = idr_alloc(&ac97_adapter_idr, ac97_ctrl, 0, 0, GFP_KERNEL);
317 ac97_ctrl->nr = ret;
318 if (ret >= 0) {
319 dev_set_name(&ac97_ctrl->adap, "ac97-%d", ret);
320 ac97_ctrl->adap.type = &ac97_adapter_type;
321 ac97_ctrl->adap.parent = ac97_ctrl->parent;
322 ret = device_register(&ac97_ctrl->adap);
323 if (ret)
324 put_device(&ac97_ctrl->adap);
325 }
326 if (!ret)
327 list_add(&ac97_ctrl->controllers, &ac97_controllers);
328 mutex_unlock(&ac97_controllers_mutex);
329
330 if (!ret)
331 dev_dbg(&ac97_ctrl->adap, "adapter registered by %s\n",
332 dev_name(ac97_ctrl->parent));
333 return ret;
334 }
335
336
337
338
339
340
341
342
343
344
345
346
347
348 struct ac97_controller *snd_ac97_controller_register(
349 const struct ac97_controller_ops *ops, struct device *dev,
350 unsigned short slots_available, void **codecs_pdata)
351 {
352 struct ac97_controller *ac97_ctrl;
353 int ret, i;
354
355 ac97_ctrl = kzalloc(sizeof(*ac97_ctrl), GFP_KERNEL);
356 if (!ac97_ctrl)
357 return ERR_PTR(-ENOMEM);
358
359 for (i = 0; i < AC97_BUS_MAX_CODECS && codecs_pdata; i++)
360 ac97_ctrl->codecs_pdata[i] = codecs_pdata[i];
361
362 ac97_ctrl->ops = ops;
363 ac97_ctrl->slots_available = slots_available;
364 ac97_ctrl->parent = dev;
365 ret = ac97_add_adapter(ac97_ctrl);
366
367 if (ret)
368 goto err;
369 ac97_bus_reset(ac97_ctrl);
370 ac97_bus_scan(ac97_ctrl);
371
372 return ac97_ctrl;
373 err:
374 kfree(ac97_ctrl);
375 return ERR_PTR(ret);
376 }
377 EXPORT_SYMBOL_GPL(snd_ac97_controller_register);
378
379
380
381
382
383
384 void snd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl)
385 {
386 ac97_del_adapter(ac97_ctrl);
387 }
388 EXPORT_SYMBOL_GPL(snd_ac97_controller_unregister);
389
390 #ifdef CONFIG_PM
391 static int ac97_pm_runtime_suspend(struct device *dev)
392 {
393 struct ac97_codec_device *codec = to_ac97_device(dev);
394 int ret = pm_generic_runtime_suspend(dev);
395
396 if (ret == 0 && dev->driver) {
397 if (pm_runtime_is_irq_safe(dev))
398 clk_disable(codec->clk);
399 else
400 clk_disable_unprepare(codec->clk);
401 }
402
403 return ret;
404 }
405
406 static int ac97_pm_runtime_resume(struct device *dev)
407 {
408 struct ac97_codec_device *codec = to_ac97_device(dev);
409 int ret;
410
411 if (dev->driver) {
412 if (pm_runtime_is_irq_safe(dev))
413 ret = clk_enable(codec->clk);
414 else
415 ret = clk_prepare_enable(codec->clk);
416 if (ret)
417 return ret;
418 }
419
420 return pm_generic_runtime_resume(dev);
421 }
422 #endif
423
424 static const struct dev_pm_ops ac97_pm = {
425 .suspend = pm_generic_suspend,
426 .resume = pm_generic_resume,
427 .freeze = pm_generic_freeze,
428 .thaw = pm_generic_thaw,
429 .poweroff = pm_generic_poweroff,
430 .restore = pm_generic_restore,
431 SET_RUNTIME_PM_OPS(
432 ac97_pm_runtime_suspend,
433 ac97_pm_runtime_resume,
434 NULL)
435 };
436
437 static int ac97_get_enable_clk(struct ac97_codec_device *adev)
438 {
439 int ret;
440
441 adev->clk = clk_get(&adev->dev, "ac97_clk");
442 if (IS_ERR(adev->clk))
443 return PTR_ERR(adev->clk);
444
445 ret = clk_prepare_enable(adev->clk);
446 if (ret)
447 clk_put(adev->clk);
448
449 return ret;
450 }
451
452 static void ac97_put_disable_clk(struct ac97_codec_device *adev)
453 {
454 clk_disable_unprepare(adev->clk);
455 clk_put(adev->clk);
456 }
457
458 static ssize_t vendor_id_show(struct device *dev,
459 struct device_attribute *attr, char *buf)
460 {
461 struct ac97_codec_device *codec = to_ac97_device(dev);
462
463 return sprintf(buf, "%08x", codec->vendor_id);
464 }
465 DEVICE_ATTR_RO(vendor_id);
466
467 static struct attribute *ac97_dev_attrs[] = {
468 &dev_attr_vendor_id.attr,
469 NULL,
470 };
471 ATTRIBUTE_GROUPS(ac97_dev);
472
473 static int ac97_bus_match(struct device *dev, struct device_driver *drv)
474 {
475 struct ac97_codec_device *adev = to_ac97_device(dev);
476 struct ac97_codec_driver *adrv = to_ac97_driver(drv);
477 const struct ac97_id *id = adrv->id_table;
478 int i = 0;
479
480 if (adev->vendor_id == 0x0 || adev->vendor_id == 0xffffffff)
481 return false;
482
483 do {
484 if (ac97_ids_match(id[i].id, adev->vendor_id, id[i].mask))
485 return true;
486 } while (id[i++].id);
487
488 return false;
489 }
490
491 static int ac97_bus_probe(struct device *dev)
492 {
493 struct ac97_codec_device *adev = to_ac97_device(dev);
494 struct ac97_codec_driver *adrv = to_ac97_driver(dev->driver);
495 int ret;
496
497 ret = ac97_get_enable_clk(adev);
498 if (ret)
499 return ret;
500
501 pm_runtime_get_noresume(dev);
502 pm_runtime_set_active(dev);
503 pm_runtime_enable(dev);
504
505 ret = adrv->probe(adev);
506 if (ret == 0)
507 return 0;
508
509 pm_runtime_disable(dev);
510 pm_runtime_set_suspended(dev);
511 pm_runtime_put_noidle(dev);
512 ac97_put_disable_clk(adev);
513
514 return ret;
515 }
516
517 static int ac97_bus_remove(struct device *dev)
518 {
519 struct ac97_codec_device *adev = to_ac97_device(dev);
520 struct ac97_codec_driver *adrv = to_ac97_driver(dev->driver);
521 int ret;
522
523 ret = pm_runtime_get_sync(dev);
524 if (ret < 0)
525 return ret;
526
527 ret = adrv->remove(adev);
528 pm_runtime_put_noidle(dev);
529 if (ret == 0)
530 ac97_put_disable_clk(adev);
531
532 pm_runtime_disable(dev);
533
534 return ret;
535 }
536
537 static struct bus_type ac97_bus_type = {
538 .name = "ac97bus",
539 .dev_groups = ac97_dev_groups,
540 .match = ac97_bus_match,
541 .pm = &ac97_pm,
542 .probe = ac97_bus_probe,
543 .remove = ac97_bus_remove,
544 };
545
546 static int __init ac97_bus_init(void)
547 {
548 return bus_register(&ac97_bus_type);
549 }
550 subsys_initcall(ac97_bus_init);
551
552 static void __exit ac97_bus_exit(void)
553 {
554 bus_unregister(&ac97_bus_type);
555 }
556 module_exit(ac97_bus_exit);
557
558 MODULE_LICENSE("GPL");
559 MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");