1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2016 Robert Jarzmik <robert.jarzmik@free.fr>
6 #include <linux/module.h>
7 #include <linux/bitops.h>
9 #include <linux/device.h>
10 #include <linux/idr.h>
11 #include <linux/list.h>
12 #include <linux/mutex.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>
22 #include "ac97_core.h"
25 * Protects ac97_controllers and each ac97_controller structure.
27 static DEFINE_MUTEX(ac97_controllers_mutex);
28 static DEFINE_IDR(ac97_adapter_idr);
29 static LIST_HEAD(ac97_controllers);
31 static struct bus_type ac97_bus_type;
33 static inline struct ac97_controller*
34 to_ac97_controller(struct device *ac97_adapter)
36 return container_of(ac97_adapter, struct ac97_controller, adap);
39 static int ac97_unbound_ctrl_write(struct ac97_controller *adrv, int slot,
40 unsigned short reg, unsigned short val)
45 static int ac97_unbound_ctrl_read(struct ac97_controller *adrv, int slot,
51 static const struct ac97_controller_ops ac97_unbound_ctrl_ops = {
52 .write = ac97_unbound_ctrl_write,
53 .read = ac97_unbound_ctrl_read,
56 static struct ac97_controller ac97_unbound_ctrl = {
57 .ops = &ac97_unbound_ctrl_ops,
60 static struct ac97_codec_device *
61 ac97_codec_find(struct ac97_controller *ac97_ctrl, unsigned int codec_num)
63 if (codec_num >= AC97_BUS_MAX_CODECS)
64 return ERR_PTR(-EINVAL);
66 return ac97_ctrl->codecs[codec_num];
69 static struct device_node *
70 ac97_of_get_child_device(struct ac97_controller *ac97_ctrl, int idx,
71 unsigned int vendor_id)
73 struct device_node *node;
75 char compat[] = "ac97,0000,0000";
77 snprintf(compat, sizeof(compat), "ac97,%04x,%04x",
78 vendor_id >> 16, vendor_id & 0xffff);
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))
90 static void ac97_codec_release(struct device *dev)
92 struct ac97_codec_device *adev;
93 struct ac97_controller *ac97_ctrl;
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);
102 static int ac97_codec_add(struct ac97_controller *ac97_ctrl, int idx,
103 unsigned int vendor_id)
105 struct ac97_codec_device *codec;
108 codec = kzalloc(sizeof(*codec), GFP_KERNEL);
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;
117 codec->ac97_ctrl = ac97_ctrl;
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,
124 ret = device_add(&codec->dev);
126 put_device(&codec->dev);
133 unsigned int snd_ac97_bus_scan_one(struct ac97_controller *adrv,
134 unsigned int codec_num)
136 unsigned short vid1, vid2;
139 ret = adrv->ops->read(adrv, codec_num, AC97_VENDOR_ID1);
140 vid1 = (ret & 0xffff);
144 ret = adrv->ops->read(adrv, codec_num, AC97_VENDOR_ID2);
145 vid2 = (ret & 0xffff);
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);
154 static int ac97_bus_scan(struct ac97_controller *ac97_ctrl)
157 unsigned int vendor_id;
159 for (i = 0; i < AC97_BUS_MAX_CODECS; i++) {
160 if (ac97_codec_find(ac97_ctrl, i))
162 if (!(ac97_ctrl->slots_available & BIT(i)))
164 vendor_id = snd_ac97_bus_scan_one(ac97_ctrl, i);
168 ret = ac97_codec_add(ac97_ctrl, i, vendor_id);
175 static int ac97_bus_reset(struct ac97_controller *ac97_ctrl)
177 ac97_ctrl->ops->reset(ac97_ctrl);
183 * snd_ac97_codec_driver_register - register an AC97 codec driver
184 * @dev: AC97 driver codec to register
186 * Register an AC97 codec driver to the ac97 bus driver, aka. the AC97 digital
189 * Returns 0 on success or error code
191 int snd_ac97_codec_driver_register(struct ac97_codec_driver *drv)
193 drv->driver.bus = &ac97_bus_type;
194 return driver_register(&drv->driver);
196 EXPORT_SYMBOL_GPL(snd_ac97_codec_driver_register);
199 * snd_ac97_codec_driver_unregister - unregister an AC97 codec driver
200 * @dev: AC97 codec driver to unregister
202 * Unregister a previously registered ac97 codec driver.
204 void snd_ac97_codec_driver_unregister(struct ac97_codec_driver *drv)
206 driver_unregister(&drv->driver);
208 EXPORT_SYMBOL_GPL(snd_ac97_codec_driver_unregister);
211 * snd_ac97_codec_get_platdata - get platform_data
212 * @adev: the ac97 codec device
214 * For legacy platforms, in order to have platform_data in codec drivers
215 * available, while ac97 device are auto-created upon probe, this retrieves the
216 * platdata which was setup on ac97 controller registration.
218 * Returns the platform data pointer
220 void *snd_ac97_codec_get_platdata(const struct ac97_codec_device *adev)
222 struct ac97_controller *ac97_ctrl = adev->ac97_ctrl;
224 return ac97_ctrl->codecs_pdata[adev->num];
226 EXPORT_SYMBOL_GPL(snd_ac97_codec_get_platdata);
228 static void ac97_ctrl_codecs_unregister(struct ac97_controller *ac97_ctrl)
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);
239 static ssize_t cold_reset_store(struct device *dev,
240 struct device_attribute *attr, const char *buf,
243 struct ac97_controller *ac97_ctrl;
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);
251 static DEVICE_ATTR_WO(cold_reset);
253 static ssize_t warm_reset_store(struct device *dev,
254 struct device_attribute *attr, const char *buf,
257 struct ac97_controller *ac97_ctrl;
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);
268 static DEVICE_ATTR_WO(warm_reset);
270 static struct attribute *ac97_controller_device_attrs[] = {
271 &dev_attr_cold_reset.attr,
272 &dev_attr_warm_reset.attr,
276 static const struct attribute_group ac97_adapter_attr_group = {
277 .name = "ac97_operations",
278 .attrs = ac97_controller_device_attrs,
281 static const struct attribute_group *ac97_adapter_groups[] = {
282 &ac97_adapter_attr_group,
286 static void ac97_del_adapter(struct ac97_controller *ac97_ctrl)
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);
293 device_unregister(&ac97_ctrl->adap);
296 static void ac97_adapter_release(struct device *dev)
298 struct ac97_controller *ac97_ctrl;
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));
306 static const struct device_type ac97_adapter_type = {
307 .groups = ac97_adapter_groups,
308 .release = ac97_adapter_release,
311 static int ac97_add_adapter(struct ac97_controller *ac97_ctrl)
315 mutex_lock(&ac97_controllers_mutex);
316 ret = idr_alloc(&ac97_adapter_idr, ac97_ctrl, 0, 0, GFP_KERNEL);
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);
324 put_device(&ac97_ctrl->adap);
327 list_add(&ac97_ctrl->controllers, &ac97_controllers);
328 mutex_unlock(&ac97_controllers_mutex);
331 dev_dbg(&ac97_ctrl->adap, "adapter registered by %s\n",
332 dev_name(ac97_ctrl->parent));
337 * snd_ac97_controller_register - register an ac97 controller
338 * @ops: the ac97 bus operations
339 * @dev: the device providing the ac97 DC function
340 * @slots_available: mask of the ac97 codecs that can be scanned and probed
341 * bit0 => codec 0, bit1 => codec 1 ... bit 3 => codec 3
343 * Register a digital controller which can control up to 4 ac97 codecs. This is
344 * the controller side of the AC97 AC-link, while the slave side are the codecs.
346 * Returns a valid controller upon success, negative pointer value upon error
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)
352 struct ac97_controller *ac97_ctrl;
355 ac97_ctrl = kzalloc(sizeof(*ac97_ctrl), GFP_KERNEL);
357 return ERR_PTR(-ENOMEM);
359 for (i = 0; i < AC97_BUS_MAX_CODECS && codecs_pdata; i++)
360 ac97_ctrl->codecs_pdata[i] = codecs_pdata[i];
362 ac97_ctrl->ops = ops;
363 ac97_ctrl->slots_available = slots_available;
364 ac97_ctrl->parent = dev;
365 ret = ac97_add_adapter(ac97_ctrl);
369 ac97_bus_reset(ac97_ctrl);
370 ac97_bus_scan(ac97_ctrl);
377 EXPORT_SYMBOL_GPL(snd_ac97_controller_register);
380 * snd_ac97_controller_unregister - unregister an ac97 controller
381 * @ac97_ctrl: the device previously provided to ac97_controller_register()
384 void snd_ac97_controller_unregister(struct ac97_controller *ac97_ctrl)
386 ac97_del_adapter(ac97_ctrl);
388 EXPORT_SYMBOL_GPL(snd_ac97_controller_unregister);
391 static int ac97_pm_runtime_suspend(struct device *dev)
393 struct ac97_codec_device *codec = to_ac97_device(dev);
394 int ret = pm_generic_runtime_suspend(dev);
396 if (ret == 0 && dev->driver) {
397 if (pm_runtime_is_irq_safe(dev))
398 clk_disable(codec->clk);
400 clk_disable_unprepare(codec->clk);
406 static int ac97_pm_runtime_resume(struct device *dev)
408 struct ac97_codec_device *codec = to_ac97_device(dev);
412 if (pm_runtime_is_irq_safe(dev))
413 ret = clk_enable(codec->clk);
415 ret = clk_prepare_enable(codec->clk);
420 return pm_generic_runtime_resume(dev);
422 #endif /* CONFIG_PM */
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,
432 ac97_pm_runtime_suspend,
433 ac97_pm_runtime_resume,
437 static int ac97_get_enable_clk(struct ac97_codec_device *adev)
441 adev->clk = clk_get(&adev->dev, "ac97_clk");
442 if (IS_ERR(adev->clk))
443 return PTR_ERR(adev->clk);
445 ret = clk_prepare_enable(adev->clk);
452 static void ac97_put_disable_clk(struct ac97_codec_device *adev)
454 clk_disable_unprepare(adev->clk);
458 static ssize_t vendor_id_show(struct device *dev,
459 struct device_attribute *attr, char *buf)
461 struct ac97_codec_device *codec = to_ac97_device(dev);
463 return sysfs_emit(buf, "%08x", codec->vendor_id);
465 DEVICE_ATTR_RO(vendor_id);
467 static struct attribute *ac97_dev_attrs[] = {
468 &dev_attr_vendor_id.attr,
471 ATTRIBUTE_GROUPS(ac97_dev);
473 static int ac97_bus_match(struct device *dev, struct device_driver *drv)
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;
480 if (adev->vendor_id == 0x0 || adev->vendor_id == 0xffffffff)
484 if (ac97_ids_match(id[i].id, adev->vendor_id, id[i].mask))
486 } while (id[i++].id);
491 static int ac97_bus_probe(struct device *dev)
493 struct ac97_codec_device *adev = to_ac97_device(dev);
494 struct ac97_codec_driver *adrv = to_ac97_driver(dev->driver);
497 ret = ac97_get_enable_clk(adev);
501 pm_runtime_get_noresume(dev);
502 pm_runtime_set_active(dev);
503 pm_runtime_enable(dev);
505 ret = adrv->probe(adev);
509 pm_runtime_disable(dev);
510 pm_runtime_set_suspended(dev);
511 pm_runtime_put_noidle(dev);
512 ac97_put_disable_clk(adev);
517 static void ac97_bus_remove(struct device *dev)
519 struct ac97_codec_device *adev = to_ac97_device(dev);
520 struct ac97_codec_driver *adrv = to_ac97_driver(dev->driver);
523 ret = pm_runtime_resume_and_get(dev);
528 pm_runtime_put_noidle(dev);
529 ac97_put_disable_clk(adev);
531 pm_runtime_disable(dev);
534 static struct bus_type ac97_bus_type = {
536 .dev_groups = ac97_dev_groups,
537 .match = ac97_bus_match,
539 .probe = ac97_bus_probe,
540 .remove = ac97_bus_remove,
543 static int __init ac97_bus_init(void)
545 return bus_register(&ac97_bus_type);
547 subsys_initcall(ac97_bus_init);
549 static void __exit ac97_bus_exit(void)
551 bus_unregister(&ac97_bus_type);
553 module_exit(ac97_bus_exit);
555 MODULE_LICENSE("GPL");
556 MODULE_AUTHOR("Robert Jarzmik <robert.jarzmik@free.fr>");