From f87135f56cb266e031f5ec081dfbde7e43f55e80 Mon Sep 17 00:00:00 2001 From: Clemens Ladisch Date: Sun, 20 Nov 2005 14:06:59 +0100 Subject: [ALSA] dynamic minors (3/6): store device-specific object pointers dynamically Instead of storing the pointers to the device-specific structures in an array, put them into the struct snd_minor, and look them up dynamically. This makes the device type modules independent of the minor number encoding. Signed-off-by: Clemens Ladisch --- sound/core/pcm.c | 118 ++++++++++++++++++++++++++++++------------------------- 1 file changed, 65 insertions(+), 53 deletions(-) (limited to 'sound/core/pcm.c') diff --git a/sound/core/pcm.c b/sound/core/pcm.c index 2bc5f69ec2a..95036c83de4 100644 --- a/sound/core/pcm.c +++ b/sound/core/pcm.c @@ -33,7 +33,7 @@ MODULE_AUTHOR("Jaroslav Kysela , Abramo Bagnara card == card && pcm->device == device) + return pcm; + } + return NULL; +} + static int snd_pcm_control_ioctl(struct snd_card *card, struct snd_ctl_file *control, unsigned int cmd, unsigned long arg) { - unsigned int tmp; - - tmp = card->number * SNDRV_PCM_DEVICES; switch (cmd) { case SNDRV_CTL_IOCTL_PCM_NEXT_DEVICE: { @@ -57,14 +67,16 @@ static int snd_pcm_control_ioctl(struct snd_card *card, if (get_user(device, (int __user *)arg)) return -EFAULT; + down(®ister_mutex); device = device < 0 ? 0 : device + 1; while (device < SNDRV_PCM_DEVICES) { - if (snd_pcm_devices[tmp + device]) + if (snd_pcm_search(card, device)) break; device++; } if (device == SNDRV_PCM_DEVICES) device = -1; + up(®ister_mutex); if (put_user(device, (int __user *)arg)) return -EFAULT; return 0; @@ -77,31 +89,44 @@ static int snd_pcm_control_ioctl(struct snd_card *card, struct snd_pcm *pcm; struct snd_pcm_str *pstr; struct snd_pcm_substream *substream; + int err; + info = (struct snd_pcm_info __user *)arg; if (get_user(device, &info->device)) return -EFAULT; - if (device >= SNDRV_PCM_DEVICES) - return -ENXIO; - pcm = snd_pcm_devices[tmp + device]; - if (pcm == NULL) - return -ENXIO; if (get_user(stream, &info->stream)) return -EFAULT; if (stream < 0 || stream > 1) return -EINVAL; - pstr = &pcm->streams[stream]; - if (pstr->substream_count == 0) - return -ENOENT; if (get_user(subdevice, &info->subdevice)) return -EFAULT; - if (subdevice >= pstr->substream_count) - return -ENXIO; - for (substream = pstr->substream; substream; substream = substream->next) + down(®ister_mutex); + pcm = snd_pcm_search(card, device); + if (pcm == NULL) { + err = -ENXIO; + goto _error; + } + pstr = &pcm->streams[stream]; + if (pstr->substream_count == 0) { + err = -ENOENT; + goto _error; + } + if (subdevice >= pstr->substream_count) { + err = -ENXIO; + goto _error; + } + for (substream = pstr->substream; substream; + substream = substream->next) if (substream->number == (int)subdevice) break; - if (substream == NULL) - return -ENXIO; - return snd_pcm_info_user(substream, info); + if (substream == NULL) { + err = -ENXIO; + goto _error; + } + err = snd_pcm_info_user(substream, info); + _error: + up(®ister_mutex); + return err; } case SNDRV_CTL_IOCTL_PCM_PREFER_SUBDEVICE: { @@ -865,8 +890,7 @@ void snd_pcm_release_substream(struct snd_pcm_substream *substream) static int snd_pcm_dev_register(struct snd_device *device) { - int idx, cidx, err; - unsigned short minor; + int cidx, err; struct snd_pcm_substream *substream; struct list_head *list; char str[16]; @@ -874,12 +898,11 @@ static int snd_pcm_dev_register(struct snd_device *device) snd_assert(pcm != NULL && device != NULL, return -ENXIO); down(®ister_mutex); - idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device; - if (snd_pcm_devices[idx]) { + if (snd_pcm_search(pcm->card, pcm->device)) { up(®ister_mutex); return -EBUSY; } - snd_pcm_devices[idx] = pcm; + list_add_tail(&pcm->list, &snd_pcm_devices); for (cidx = 0; cidx < 2; cidx++) { int devtype = -1; if (pcm->streams[cidx].substream == NULL) @@ -887,20 +910,19 @@ static int snd_pcm_dev_register(struct snd_device *device) switch (cidx) { case SNDRV_PCM_STREAM_PLAYBACK: sprintf(str, "pcmC%iD%ip", pcm->card->number, pcm->device); - minor = SNDRV_MINOR_PCM_PLAYBACK + idx; devtype = SNDRV_DEVICE_TYPE_PCM_PLAYBACK; break; case SNDRV_PCM_STREAM_CAPTURE: sprintf(str, "pcmC%iD%ic", pcm->card->number, pcm->device); - minor = SNDRV_MINOR_PCM_CAPTURE + idx; devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE; break; } if ((err = snd_register_device(devtype, pcm->card, pcm->device, - &snd_pcm_f_ops[cidx], str)) < 0) + &snd_pcm_f_ops[cidx], + pcm, str)) < 0) { - snd_pcm_devices[idx] = NULL; + list_del(&pcm->list); up(®ister_mutex); return err; } @@ -921,11 +943,10 @@ static int snd_pcm_dev_disconnect(struct snd_device *device) struct snd_pcm *pcm = device->device_data; struct list_head *list; struct snd_pcm_substream *substream; - int idx, cidx; + int cidx; down(®ister_mutex); - idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device; - snd_pcm_devices[idx] = NULL; + list_del_init(&pcm->list); for (cidx = 0; cidx < 2; cidx++) for (substream = pcm->streams[cidx].substream; substream; substream = substream->next) if (substream->runtime) @@ -941,15 +962,14 @@ static int snd_pcm_dev_disconnect(struct snd_device *device) static int snd_pcm_dev_unregister(struct snd_device *device) { - int idx, cidx, devtype; + int cidx, devtype; struct snd_pcm_substream *substream; struct list_head *list; struct snd_pcm *pcm = device->device_data; snd_assert(pcm != NULL, return -ENXIO); down(®ister_mutex); - idx = (pcm->card->number * SNDRV_PCM_DEVICES) + pcm->device; - snd_pcm_devices[idx] = NULL; + list_del(&pcm->list); for (cidx = 0; cidx < 2; cidx++) { devtype = -1; switch (cidx) { @@ -975,24 +995,19 @@ static int snd_pcm_dev_unregister(struct snd_device *device) int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree) { - int idx; + struct list_head *p; snd_assert(notify != NULL && notify->n_register != NULL && notify->n_unregister != NULL, return -EINVAL); down(®ister_mutex); if (nfree) { list_del(¬ify->list); - for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) { - if (snd_pcm_devices[idx] == NULL) - continue; - notify->n_unregister(snd_pcm_devices[idx]); - } + list_for_each(p, &snd_pcm_devices) + notify->n_unregister(list_entry(p, + struct snd_pcm, list)); } else { list_add_tail(¬ify->list, &snd_pcm_notify_list); - for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) { - if (snd_pcm_devices[idx] == NULL) - continue; - notify->n_register(snd_pcm_devices[idx]); - } + list_for_each(p, &snd_pcm_devices) + notify->n_register(list_entry(p, struct snd_pcm, list)); } up(®ister_mutex); return 0; @@ -1005,16 +1020,14 @@ int snd_pcm_notify(struct snd_pcm_notify *notify, int nfree) static void snd_pcm_proc_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) { - int idx; + struct list_head *p; struct snd_pcm *pcm; down(®ister_mutex); - for (idx = 0; idx < SNDRV_CARDS * SNDRV_PCM_DEVICES; idx++) { - pcm = snd_pcm_devices[idx]; - if (pcm == NULL) - continue; - snd_iprintf(buffer, "%02i-%02i: %s : %s", idx / SNDRV_PCM_DEVICES, - idx % SNDRV_PCM_DEVICES, pcm->id, pcm->name); + list_for_each(p, &snd_pcm_devices) { + pcm = list_entry(p, struct snd_pcm, list); + snd_iprintf(buffer, "%02i-%02i: %s : %s", + pcm->card->number, pcm->device, pcm->id, pcm->name); if (pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream) snd_iprintf(buffer, " : playback %i", pcm->streams[SNDRV_PCM_STREAM_PLAYBACK].substream_count); @@ -1063,7 +1076,6 @@ static void __exit alsa_pcm_exit(void) module_init(alsa_pcm_init) module_exit(alsa_pcm_exit) -EXPORT_SYMBOL(snd_pcm_devices); EXPORT_SYMBOL(snd_pcm_new); EXPORT_SYMBOL(snd_pcm_new_stream); EXPORT_SYMBOL(snd_pcm_notify); -- cgit v1.2.3-18-g5258