2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 #include <linux/init.h>
19 #include <linux/usb.h>
20 #include <linux/usb/audio.h>
21 #include <linux/usb/audio-v2.h>
23 #include <sound/core.h>
24 #include <sound/pcm.h>
39 static void free_substream(struct snd_usb_substream *subs)
41 struct list_head *p, *n;
43 if (!subs->num_formats)
44 return; /* not initialized */
45 list_for_each_safe(p, n, &subs->fmt_list) {
46 struct audioformat *fp = list_entry(p, struct audioformat, list);
47 kfree(fp->rate_table);
50 kfree(subs->rate_list.list);
55 * free a usb stream instance
57 static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
59 free_substream(&stream->substream[0]);
60 free_substream(&stream->substream[1]);
61 list_del(&stream->list);
65 static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
67 struct snd_usb_stream *stream = pcm->private_data;
70 snd_usb_audio_stream_free(stream);
76 * add this endpoint to the chip instance.
77 * if a stream with the same endpoint already exists, append to it.
78 * if not, create a new pcm stream.
80 int snd_usb_add_audio_endpoint(struct snd_usb_audio *chip, int stream, struct audioformat *fp)
83 struct snd_usb_stream *as;
84 struct snd_usb_substream *subs;
88 list_for_each(p, &chip->pcm_list) {
89 as = list_entry(p, struct snd_usb_stream, list);
90 if (as->fmt_type != fp->fmt_type)
92 subs = &as->substream[stream];
95 if (subs->endpoint == fp->endpoint) {
96 list_add_tail(&fp->list, &subs->fmt_list);
98 subs->formats |= fp->formats;
102 /* look for an empty stream */
103 list_for_each(p, &chip->pcm_list) {
104 as = list_entry(p, struct snd_usb_stream, list);
105 if (as->fmt_type != fp->fmt_type)
107 subs = &as->substream[stream];
110 err = snd_pcm_new_stream(as->pcm, stream, 1);
113 snd_usb_init_substream(as, stream, fp);
117 /* create a new pcm */
118 as = kzalloc(sizeof(*as), GFP_KERNEL);
121 as->pcm_index = chip->pcm_devs;
123 as->fmt_type = fp->fmt_type;
124 err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
125 stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
126 stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
133 pcm->private_data = as;
134 pcm->private_free = snd_usb_audio_pcm_free;
136 if (chip->pcm_devs > 0)
137 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
139 strcpy(pcm->name, "USB Audio");
141 snd_usb_init_substream(as, stream, fp);
143 list_add(&as->list, &chip->pcm_list);
146 snd_usb_proc_pcm_format_add(as);
151 int snd_usb_parse_audio_endpoints(struct snd_usb_audio *chip, int iface_no)
153 struct usb_device *dev;
154 struct usb_interface *iface;
155 struct usb_host_interface *alts;
156 struct usb_interface_descriptor *altsd;
157 int i, altno, err, stream;
158 int format = 0, num_channels = 0;
159 struct audioformat *fp = NULL;
160 unsigned char *fmt, *csep;
165 /* parse the interface's altsettings */
166 iface = usb_ifnum_to_if(dev, iface_no);
168 num = iface->num_altsetting;
171 * Dallas DS4201 workaround: It presents 5 altsettings, but the last
172 * one misses syncpipe, and does not produce any sound.
174 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
177 for (i = 0; i < num; i++) {
178 alts = &iface->altsetting[i];
179 altsd = get_iface_desc(alts);
180 protocol = altsd->bInterfaceProtocol;
181 /* skip invalid one */
182 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
183 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
184 (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
185 altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC) ||
186 altsd->bNumEndpoints < 1 ||
187 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
189 /* must be isochronous */
190 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
191 USB_ENDPOINT_XFER_ISOC)
193 /* check direction */
194 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
195 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
196 altno = altsd->bAlternateSetting;
198 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
201 /* get audio formats */
203 case UAC_VERSION_1: {
204 struct uac_as_header_descriptor_v1 *as =
205 snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
208 snd_printk(KERN_ERR "%d:%u:%d : UAC_AS_GENERAL descriptor not found\n",
209 dev->devnum, iface_no, altno);
213 if (as->bLength < sizeof(*as)) {
214 snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_AS_GENERAL desc\n",
215 dev->devnum, iface_no, altno);
219 format = le16_to_cpu(as->wFormatTag); /* remember the format value */
223 case UAC_VERSION_2: {
224 struct uac_as_header_descriptor_v2 *as =
225 snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
228 snd_printk(KERN_ERR "%d:%u:%d : UAC_AS_GENERAL descriptor not found\n",
229 dev->devnum, iface_no, altno);
233 if (as->bLength < sizeof(*as)) {
234 snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_AS_GENERAL desc\n",
235 dev->devnum, iface_no, altno);
239 num_channels = as->bNrChannels;
240 format = le32_to_cpu(as->bmFormats);
246 snd_printk(KERN_ERR "%d:%u:%d : unknown interface protocol %04x\n",
247 dev->devnum, iface_no, altno, protocol);
251 /* get format type */
252 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_FORMAT_TYPE);
254 snd_printk(KERN_ERR "%d:%u:%d : no UAC_FORMAT_TYPE desc\n",
255 dev->devnum, iface_no, altno);
258 if (((protocol == UAC_VERSION_1) && (fmt[0] < 8)) ||
259 ((protocol == UAC_VERSION_2) && (fmt[0] != 6))) {
260 snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_FORMAT_TYPE desc\n",
261 dev->devnum, iface_no, altno);
266 * Blue Microphones workaround: The last altsetting is identical
267 * with the previous one, except for a larger packet size, but
268 * is actually a mislabeled two-channel setting; ignore it.
270 if (fmt[4] == 1 && fmt[5] == 2 && altno == 2 && num == 3 &&
271 fp && fp->altsetting == 1 && fp->channels == 1 &&
272 fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
273 protocol == UAC_VERSION_1 &&
274 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
278 csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
279 /* Creamware Noah has this descriptor after the 2nd endpoint */
280 if (!csep && altsd->bNumEndpoints >= 2)
281 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
282 if (!csep || csep[0] < 7 || csep[2] != UAC_EP_GENERAL) {
283 snd_printk(KERN_WARNING "%d:%u:%d : no or invalid"
284 " class specific endpoint descriptor\n",
285 dev->devnum, iface_no, altno);
289 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
291 snd_printk(KERN_ERR "cannot malloc\n");
295 fp->iface = iface_no;
296 fp->altsetting = altno;
298 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
299 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
300 fp->datainterval = snd_usb_parse_datainterval(chip, alts);
301 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
302 /* num_channels is only set for v2 interfaces */
303 fp->channels = num_channels;
304 if (snd_usb_get_speed(dev) == USB_SPEED_HIGH)
305 fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
306 * (fp->maxpacksize & 0x7ff);
307 fp->attributes = csep ? csep[3] : 0;
309 /* some quirks for attributes here */
311 switch (chip->usb_id) {
312 case USB_ID(0x0a92, 0x0053): /* AudioTrak Optoplay */
313 /* Optoplay sets the sample rate attribute although
314 * it seems not supporting it in fact.
316 fp->attributes &= ~UAC_EP_CS_ATTR_SAMPLE_RATE;
318 case USB_ID(0x041e, 0x3020): /* Creative SB Audigy 2 NX */
319 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
320 /* doesn't set the sample rate attribute, but supports it */
321 fp->attributes |= UAC_EP_CS_ATTR_SAMPLE_RATE;
323 case USB_ID(0x047f, 0x0ca1): /* plantronics headset */
324 case USB_ID(0x077d, 0x07af): /* Griffin iMic (note that there is
325 an older model 77d:223) */
327 * plantronics headset and Griffin iMic have set adaptive-in
328 * although it's really not...
330 fp->ep_attr &= ~USB_ENDPOINT_SYNCTYPE;
331 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
332 fp->ep_attr |= USB_ENDPOINT_SYNC_ADAPTIVE;
334 fp->ep_attr |= USB_ENDPOINT_SYNC_SYNC;
338 /* ok, let's parse further... */
339 if (snd_usb_parse_audio_format(chip, fp, format, fmt, stream, alts) < 0) {
340 kfree(fp->rate_table);
345 snd_printdd(KERN_INFO "%d:%u:%d: add audio endpoint %#x\n", dev->devnum, iface_no, altno, fp->endpoint);
346 err = snd_usb_add_audio_endpoint(chip, stream, fp);
348 kfree(fp->rate_table);
352 /* try to set the interface... */
353 usb_set_interface(chip->dev, iface_no, altno);
354 snd_usb_init_pitch(chip, iface_no, alts, fp);
355 snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max);