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>
22 #include <sound/core.h>
23 #include <sound/pcm.h>
38 static void free_substream(struct snd_usb_substream *subs)
40 struct list_head *p, *n;
42 if (!subs->num_formats)
43 return; /* not initialized */
44 list_for_each_safe(p, n, &subs->fmt_list) {
45 struct audioformat *fp = list_entry(p, struct audioformat, list);
46 kfree(fp->rate_table);
49 kfree(subs->rate_list.list);
54 * free a usb stream instance
56 static void snd_usb_audio_stream_free(struct snd_usb_stream *stream)
58 free_substream(&stream->substream[0]);
59 free_substream(&stream->substream[1]);
60 list_del(&stream->list);
64 static void snd_usb_audio_pcm_free(struct snd_pcm *pcm)
66 struct snd_usb_stream *stream = pcm->private_data;
69 snd_usb_audio_stream_free(stream);
75 * add this endpoint to the chip instance.
76 * if a stream with the same endpoint already exists, append to it.
77 * if not, create a new pcm stream.
79 int snd_usb_add_audio_endpoint(struct snd_usb_audio *chip, int stream, struct audioformat *fp)
82 struct snd_usb_stream *as;
83 struct snd_usb_substream *subs;
87 list_for_each(p, &chip->pcm_list) {
88 as = list_entry(p, struct snd_usb_stream, list);
89 if (as->fmt_type != fp->fmt_type)
91 subs = &as->substream[stream];
94 if (subs->endpoint == fp->endpoint) {
95 list_add_tail(&fp->list, &subs->fmt_list);
97 subs->formats |= fp->formats;
101 /* look for an empty stream */
102 list_for_each(p, &chip->pcm_list) {
103 as = list_entry(p, struct snd_usb_stream, list);
104 if (as->fmt_type != fp->fmt_type)
106 subs = &as->substream[stream];
109 err = snd_pcm_new_stream(as->pcm, stream, 1);
112 snd_usb_init_substream(as, stream, fp);
116 /* create a new pcm */
117 as = kzalloc(sizeof(*as), GFP_KERNEL);
120 as->pcm_index = chip->pcm_devs;
122 as->fmt_type = fp->fmt_type;
123 err = snd_pcm_new(chip->card, "USB Audio", chip->pcm_devs,
124 stream == SNDRV_PCM_STREAM_PLAYBACK ? 1 : 0,
125 stream == SNDRV_PCM_STREAM_PLAYBACK ? 0 : 1,
132 pcm->private_data = as;
133 pcm->private_free = snd_usb_audio_pcm_free;
135 if (chip->pcm_devs > 0)
136 sprintf(pcm->name, "USB Audio #%d", chip->pcm_devs);
138 strcpy(pcm->name, "USB Audio");
140 snd_usb_init_substream(as, stream, fp);
142 list_add(&as->list, &chip->pcm_list);
145 snd_usb_proc_pcm_format_add(as);
150 int snd_usb_parse_audio_endpoints(struct snd_usb_audio *chip, int iface_no)
152 struct usb_device *dev;
153 struct usb_interface *iface;
154 struct usb_host_interface *alts;
155 struct usb_interface_descriptor *altsd;
156 int i, altno, err, stream;
157 int format = 0, num_channels = 0;
158 struct audioformat *fp = NULL;
159 unsigned char *fmt, *csep;
164 /* parse the interface's altsettings */
165 iface = usb_ifnum_to_if(dev, iface_no);
167 num = iface->num_altsetting;
170 * Dallas DS4201 workaround: It presents 5 altsettings, but the last
171 * one misses syncpipe, and does not produce any sound.
173 if (chip->usb_id == USB_ID(0x04fa, 0x4201))
176 for (i = 0; i < num; i++) {
177 alts = &iface->altsetting[i];
178 altsd = get_iface_desc(alts);
179 protocol = altsd->bInterfaceProtocol;
180 /* skip invalid one */
181 if ((altsd->bInterfaceClass != USB_CLASS_AUDIO &&
182 altsd->bInterfaceClass != USB_CLASS_VENDOR_SPEC) ||
183 (altsd->bInterfaceSubClass != USB_SUBCLASS_AUDIOSTREAMING &&
184 altsd->bInterfaceSubClass != USB_SUBCLASS_VENDOR_SPEC) ||
185 altsd->bNumEndpoints < 1 ||
186 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) == 0)
188 /* must be isochronous */
189 if ((get_endpoint(alts, 0)->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) !=
190 USB_ENDPOINT_XFER_ISOC)
192 /* check direction */
193 stream = (get_endpoint(alts, 0)->bEndpointAddress & USB_DIR_IN) ?
194 SNDRV_PCM_STREAM_CAPTURE : SNDRV_PCM_STREAM_PLAYBACK;
195 altno = altsd->bAlternateSetting;
197 if (snd_usb_apply_interface_quirk(chip, iface_no, altno))
200 /* get audio formats */
202 case UAC_VERSION_1: {
203 struct uac_as_header_descriptor_v1 *as =
204 snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
207 snd_printk(KERN_ERR "%d:%u:%d : UAC_AS_GENERAL descriptor not found\n",
208 dev->devnum, iface_no, altno);
212 if (as->bLength < sizeof(*as)) {
213 snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_AS_GENERAL desc\n",
214 dev->devnum, iface_no, altno);
218 format = le16_to_cpu(as->wFormatTag); /* remember the format value */
222 case UAC_VERSION_2: {
223 struct uac_as_header_descriptor_v2 *as =
224 snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_AS_GENERAL);
227 snd_printk(KERN_ERR "%d:%u:%d : UAC_AS_GENERAL descriptor not found\n",
228 dev->devnum, iface_no, altno);
232 if (as->bLength < sizeof(*as)) {
233 snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_AS_GENERAL desc\n",
234 dev->devnum, iface_no, altno);
238 num_channels = as->bNrChannels;
239 format = le32_to_cpu(as->bmFormats);
245 snd_printk(KERN_ERR "%d:%u:%d : unknown interface protocol %04x\n",
246 dev->devnum, iface_no, altno, protocol);
250 /* get format type */
251 fmt = snd_usb_find_csint_desc(alts->extra, alts->extralen, NULL, UAC_FORMAT_TYPE);
253 snd_printk(KERN_ERR "%d:%u:%d : no UAC_FORMAT_TYPE desc\n",
254 dev->devnum, iface_no, altno);
257 if (((protocol == UAC_VERSION_1) && (fmt[0] < 8)) ||
258 ((protocol == UAC_VERSION_2) && (fmt[0] != 6))) {
259 snd_printk(KERN_ERR "%d:%u:%d : invalid UAC_FORMAT_TYPE desc\n",
260 dev->devnum, iface_no, altno);
265 * Blue Microphones workaround: The last altsetting is identical
266 * with the previous one, except for a larger packet size, but
267 * is actually a mislabeled two-channel setting; ignore it.
269 if (fmt[4] == 1 && fmt[5] == 2 && altno == 2 && num == 3 &&
270 fp && fp->altsetting == 1 && fp->channels == 1 &&
271 fp->formats == SNDRV_PCM_FMTBIT_S16_LE &&
272 protocol == UAC_VERSION_1 &&
273 le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize) ==
277 csep = snd_usb_find_desc(alts->endpoint[0].extra, alts->endpoint[0].extralen, NULL, USB_DT_CS_ENDPOINT);
278 /* Creamware Noah has this descriptor after the 2nd endpoint */
279 if (!csep && altsd->bNumEndpoints >= 2)
280 csep = snd_usb_find_desc(alts->endpoint[1].extra, alts->endpoint[1].extralen, NULL, USB_DT_CS_ENDPOINT);
281 if (!csep || csep[0] < 7 || csep[2] != UAC_EP_GENERAL) {
282 snd_printk(KERN_WARNING "%d:%u:%d : no or invalid"
283 " class specific endpoint descriptor\n",
284 dev->devnum, iface_no, altno);
288 fp = kzalloc(sizeof(*fp), GFP_KERNEL);
290 snd_printk(KERN_ERR "cannot malloc\n");
294 fp->iface = iface_no;
295 fp->altsetting = altno;
297 fp->endpoint = get_endpoint(alts, 0)->bEndpointAddress;
298 fp->ep_attr = get_endpoint(alts, 0)->bmAttributes;
299 fp->datainterval = snd_usb_parse_datainterval(chip, alts);
300 fp->maxpacksize = le16_to_cpu(get_endpoint(alts, 0)->wMaxPacketSize);
301 /* num_channels is only set for v2 interfaces */
302 fp->channels = num_channels;
303 if (snd_usb_get_speed(dev) == USB_SPEED_HIGH)
304 fp->maxpacksize = (((fp->maxpacksize >> 11) & 3) + 1)
305 * (fp->maxpacksize & 0x7ff);
306 fp->attributes = csep ? csep[3] : 0;
308 /* some quirks for attributes here */
310 switch (chip->usb_id) {
311 case USB_ID(0x0a92, 0x0053): /* AudioTrak Optoplay */
312 /* Optoplay sets the sample rate attribute although
313 * it seems not supporting it in fact.
315 fp->attributes &= ~UAC_EP_CS_ATTR_SAMPLE_RATE;
317 case USB_ID(0x041e, 0x3020): /* Creative SB Audigy 2 NX */
318 case USB_ID(0x0763, 0x2003): /* M-Audio Audiophile USB */
319 /* doesn't set the sample rate attribute, but supports it */
320 fp->attributes |= UAC_EP_CS_ATTR_SAMPLE_RATE;
322 case USB_ID(0x047f, 0x0ca1): /* plantronics headset */
323 case USB_ID(0x077d, 0x07af): /* Griffin iMic (note that there is
324 an older model 77d:223) */
326 * plantronics headset and Griffin iMic have set adaptive-in
327 * although it's really not...
329 fp->ep_attr &= ~USB_ENDPOINT_SYNCTYPE;
330 if (stream == SNDRV_PCM_STREAM_PLAYBACK)
331 fp->ep_attr |= USB_ENDPOINT_SYNC_ADAPTIVE;
333 fp->ep_attr |= USB_ENDPOINT_SYNC_SYNC;
337 /* ok, let's parse further... */
338 if (snd_usb_parse_audio_format(chip, fp, format, fmt, stream, alts) < 0) {
339 kfree(fp->rate_table);
344 snd_printdd(KERN_INFO "%d:%u:%d: add audio endpoint %#x\n", dev->devnum, iface_no, altno, fp->endpoint);
345 err = snd_usb_add_audio_endpoint(chip, stream, fp);
347 kfree(fp->rate_table);
351 /* try to set the interface... */
352 usb_set_interface(chip->dev, iface_no, altno);
353 snd_usb_init_pitch(chip, iface_no, alts, fp);
354 snd_usb_init_sample_rate(chip, iface_no, alts, fp, fp->rate_max);