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24#include <linux/device.h>
25#include <linux/init.h>
26#include <linux/module.h>
27#include <sound/core.h>
28#include <sound/info.h>
29#include <sound/seq_device.h>
30#include <sound/seq_kernel.h>
31#include <sound/initval.h>
32#include <linux/kmod.h>
33#include <linux/slab.h>
34#include <linux/mutex.h>
35
36MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
37MODULE_DESCRIPTION("ALSA sequencer device management");
38MODULE_LICENSE("GPL");
39
40
41
42
43static int snd_seq_bus_match(struct device *dev, struct device_driver *drv)
44{
45 struct snd_seq_device *sdev = to_seq_dev(dev);
46 struct snd_seq_driver *sdrv = to_seq_drv(drv);
47
48 return strcmp(sdrv->id, sdev->id) == 0 &&
49 sdrv->argsize == sdev->argsize;
50}
51
52static struct bus_type snd_seq_bus_type = {
53 .name = "snd_seq",
54 .match = snd_seq_bus_match,
55};
56
57
58
59
60#ifdef CONFIG_SND_PROC_FS
61static struct snd_info_entry *info_entry;
62
63static int print_dev_info(struct device *dev, void *data)
64{
65 struct snd_seq_device *sdev = to_seq_dev(dev);
66 struct snd_info_buffer *buffer = data;
67
68 snd_iprintf(buffer, "snd-%s,%s,%d\n", sdev->id,
69 dev->driver ? "loaded" : "empty",
70 dev->driver ? 1 : 0);
71 return 0;
72}
73
74static void snd_seq_device_info(struct snd_info_entry *entry,
75 struct snd_info_buffer *buffer)
76{
77 bus_for_each_dev(&snd_seq_bus_type, NULL, buffer, print_dev_info);
78}
79#endif
80
81
82
83
84
85#ifdef CONFIG_MODULES
86
87static atomic_t snd_seq_in_init = ATOMIC_INIT(1);
88
89static int request_seq_drv(struct device *dev, void *data)
90{
91 struct snd_seq_device *sdev = to_seq_dev(dev);
92
93 if (!dev->driver)
94 request_module("snd-%s", sdev->id);
95 return 0;
96}
97
98static void autoload_drivers(struct work_struct *work)
99{
100
101 if (atomic_inc_return(&snd_seq_in_init) == 1)
102 bus_for_each_dev(&snd_seq_bus_type, NULL, NULL,
103 request_seq_drv);
104 atomic_dec(&snd_seq_in_init);
105}
106
107static DECLARE_WORK(autoload_work, autoload_drivers);
108
109static void queue_autoload_drivers(void)
110{
111 schedule_work(&autoload_work);
112}
113
114void snd_seq_autoload_init(void)
115{
116 atomic_dec(&snd_seq_in_init);
117#ifdef CONFIG_SND_SEQUENCER_MODULE
118
119 queue_autoload_drivers();
120#endif
121}
122EXPORT_SYMBOL(snd_seq_autoload_init);
123
124void snd_seq_autoload_exit(void)
125{
126 atomic_inc(&snd_seq_in_init);
127}
128EXPORT_SYMBOL(snd_seq_autoload_exit);
129
130void snd_seq_device_load_drivers(void)
131{
132 queue_autoload_drivers();
133 flush_work(&autoload_work);
134}
135EXPORT_SYMBOL(snd_seq_device_load_drivers);
136
137static inline void cancel_autoload_drivers(void)
138{
139 cancel_work_sync(&autoload_work);
140}
141#else
142static inline void queue_autoload_drivers(void)
143{
144}
145
146static inline void cancel_autoload_drivers(void)
147{
148}
149#endif
150
151
152
153
154static int snd_seq_device_dev_free(struct snd_device *device)
155{
156 struct snd_seq_device *dev = device->device_data;
157
158 cancel_autoload_drivers();
159 put_device(&dev->dev);
160 return 0;
161}
162
163static int snd_seq_device_dev_register(struct snd_device *device)
164{
165 struct snd_seq_device *dev = device->device_data;
166 int err;
167
168 err = device_add(&dev->dev);
169 if (err < 0)
170 return err;
171 if (!dev->dev.driver)
172 queue_autoload_drivers();
173 return 0;
174}
175
176static int snd_seq_device_dev_disconnect(struct snd_device *device)
177{
178 struct snd_seq_device *dev = device->device_data;
179
180 device_del(&dev->dev);
181 return 0;
182}
183
184static void snd_seq_dev_release(struct device *dev)
185{
186 struct snd_seq_device *sdev = to_seq_dev(dev);
187
188 if (sdev->private_free)
189 sdev->private_free(sdev);
190 kfree(sdev);
191}
192
193
194
195
196
197
198
199
200int snd_seq_device_new(struct snd_card *card, int device, const char *id,
201 int argsize, struct snd_seq_device **result)
202{
203 struct snd_seq_device *dev;
204 int err;
205 static const struct snd_device_ops dops = {
206 .dev_free = snd_seq_device_dev_free,
207 .dev_register = snd_seq_device_dev_register,
208 .dev_disconnect = snd_seq_device_dev_disconnect,
209 };
210
211 if (result)
212 *result = NULL;
213
214 if (snd_BUG_ON(!id))
215 return -EINVAL;
216
217 dev = kzalloc(sizeof(*dev) + argsize, GFP_KERNEL);
218 if (!dev)
219 return -ENOMEM;
220
221
222 dev->card = card;
223 dev->device = device;
224 dev->id = id;
225 dev->argsize = argsize;
226
227 device_initialize(&dev->dev);
228 dev->dev.parent = &card->card_dev;
229 dev->dev.bus = &snd_seq_bus_type;
230 dev->dev.release = snd_seq_dev_release;
231 dev_set_name(&dev->dev, "%s-%d-%d", dev->id, card->number, device);
232
233
234 err = snd_device_new(card, SNDRV_DEV_SEQUENCER, dev, &dops);
235 if (err < 0) {
236 put_device(&dev->dev);
237 return err;
238 }
239
240 if (result)
241 *result = dev;
242
243 return 0;
244}
245EXPORT_SYMBOL(snd_seq_device_new);
246
247
248
249
250int __snd_seq_driver_register(struct snd_seq_driver *drv, struct module *mod)
251{
252 if (WARN_ON(!drv->driver.name || !drv->id))
253 return -EINVAL;
254 drv->driver.bus = &snd_seq_bus_type;
255 drv->driver.owner = mod;
256 return driver_register(&drv->driver);
257}
258EXPORT_SYMBOL_GPL(__snd_seq_driver_register);
259
260void snd_seq_driver_unregister(struct snd_seq_driver *drv)
261{
262 driver_unregister(&drv->driver);
263}
264EXPORT_SYMBOL_GPL(snd_seq_driver_unregister);
265
266
267
268
269
270static int __init seq_dev_proc_init(void)
271{
272#ifdef CONFIG_SND_PROC_FS
273 info_entry = snd_info_create_module_entry(THIS_MODULE, "drivers",
274 snd_seq_root);
275 if (info_entry == NULL)
276 return -ENOMEM;
277 info_entry->content = SNDRV_INFO_CONTENT_TEXT;
278 info_entry->c.text.read = snd_seq_device_info;
279 if (snd_info_register(info_entry) < 0) {
280 snd_info_free_entry(info_entry);
281 return -ENOMEM;
282 }
283#endif
284 return 0;
285}
286
287static int __init alsa_seq_device_init(void)
288{
289 int err;
290
291 err = bus_register(&snd_seq_bus_type);
292 if (err < 0)
293 return err;
294 err = seq_dev_proc_init();
295 if (err < 0)
296 bus_unregister(&snd_seq_bus_type);
297 return err;
298}
299
300static void __exit alsa_seq_device_exit(void)
301{
302#ifdef CONFIG_MODULES
303 cancel_work_sync(&autoload_work);
304#endif
305#ifdef CONFIG_SND_PROC_FS
306 snd_info_free_entry(info_entry);
307#endif
308 bus_unregister(&snd_seq_bus_type);
309}
310
311subsys_initcall(alsa_seq_device_init)
312module_exit(alsa_seq_device_exit)
313