/* * Empiatech em28x1 audio extension * * Copyright (C) 2006 Markus Rechberger * * Copyright (C) 2007 Mauro Carvalho Chehab * - Port to work with the in-kernel driver * - Several cleanups * * This driver is based on my previous au600 usb pstn audio driver * and inherits all the copyrights * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "em28xx.h" static int debug; module_param(debug, int, 0644); MODULE_PARM_DESC(debug, "activates debug info"); #define dprintk(fmt, arg...) do { \ if (debug) \ printk(KERN_INFO "em28xx-audio %s: " fmt, \ __func__, ##arg); \ } while (0) static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; static int em28xx_isoc_audio_deinit(struct em28xx *dev) { int i; dprintk("Stopping isoc\n"); for (i = 0; i < EM28XX_AUDIO_BUFS; i++) { usb_unlink_urb(dev->adev.urb[i]); usb_free_urb(dev->adev.urb[i]); dev->adev.urb[i] = NULL; } return 0; } static void em28xx_audio_isocirq(struct urb *urb) { struct em28xx *dev = urb->context; int i; unsigned int oldptr; int period_elapsed = 0; int status; unsigned char *cp; unsigned int stride; struct snd_pcm_substream *substream; struct snd_pcm_runtime *runtime; if (dev->adev.capture_pcm_substream) { substream = dev->adev.capture_pcm_substream; runtime = substream->runtime; stride = runtime->frame_bits >> 3; for (i = 0; i < urb->number_of_packets; i++) { int length = urb->iso_frame_desc[i].actual_length / stride; cp = (unsigned char *)urb->transfer_buffer + urb->iso_frame_desc[i].offset; if (!length) continue; oldptr = dev->adev.hwptr_done_capture; if (oldptr + length >= runtime->buffer_size) { unsigned int cnt = runtime->buffer_size - oldptr; memcpy(runtime->dma_area + oldptr * stride, cp, cnt * stride); memcpy(runtime->dma_area, cp + cnt * stride, length * stride - cnt * stride); } else { memcpy(runtime->dma_area + oldptr * stride, cp, length * stride); } snd_pcm_stream_lock(substream); dev->adev.hwptr_done_capture += length; if (dev->adev.hwptr_done_capture >= runtime->buffer_size) dev->adev.hwptr_done_capture -= runtime->buffer_size; dev->adev.capture_transfer_done += length; if (dev->adev.capture_transfer_done >= runtime->period_size) { dev->adev.capture_transfer_done -= runtime->period_size; period_elapsed = 1; } snd_pcm_stream_unlock(substream); } if (period_elapsed) snd_pcm_period_elapsed(substream); } urb->status = 0; if (dev->adev.shutdown) return; status = usb_submit_urb(urb, GFP_ATOMIC); if (status < 0) { em28xx_errdev("resubmit of audio urb failed (error=%i)\n", status); } return; } static int em28xx_init_audio_isoc(struct em28xx *dev) { int i, errCode; const int sb_size = EM28XX_NUM_AUDIO_PACKETS * EM28XX_AUDIO_MAX_PACKET_SIZE; dprintk("Starting isoc transfers\n"); for (i = 0; i < EM28XX_AUDIO_BUFS; i++) { struct urb *urb; int j, k; dev->adev.transfer_buffer[i] = kmalloc(sb_size, GFP_ATOMIC); if (!dev->adev.transfer_buffer[i]) return -ENOMEM; memset(dev->adev.transfer_buffer[i], 0x80, sb_size); urb = usb_alloc_urb(EM28XX_NUM_AUDIO_PACKETS, GFP_ATOMIC); if (!urb) { em28xx_errdev("usb_alloc_urb failed!\n"); for (j = 0; j < i; j++) { usb_free_urb(dev->adev.urb[j]); kfree(dev->adev.transfer_buffer[j]); } return -ENOMEM; } urb->dev = dev->udev; urb->context = dev; urb->pipe = usb_rcvisocpipe(dev->udev, 0x83); urb->transfer_flags = URB_ISO_ASAP; urb->transfer_buffer = dev->adev.transfer_buffer[i]; urb->interval = 1; urb->complete = em28xx_audio_isocirq; urb->number_of_packets = EM28XX_NUM_AUDIO_PACKETS; urb->transfer_buffer_length = sb_size; for (j = k = 0; j < EM28XX_NUM_AUDIO_PACKETS; j++, k += EM28XX_AUDIO_MAX_PACKET_SIZE) { urb->iso_frame_desc[j].offset = k; urb->iso_frame_desc[j].length = EM28XX_AUDIO_MAX_PACKET_SIZE; } dev->adev.urb[i] = urb; } for (i = 0; i < EM28XX_AUDIO_BUFS; i++) { errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); if (errCode) { em28xx_isoc_audio_deinit(dev); return errCode; } } return 0; } static int em28xx_cmd(struct em28xx *dev, int cmd, int arg) { dprintk("%s transfer\n", (dev->adev.capture_stream == STREAM_ON) ? "stop" : "start"); switch (cmd) { case EM28XX_CAPTURE_STREAM_EN: if (dev->adev.capture_stream == STREAM_OFF && arg == 1) { dev->adev.capture_stream = STREAM_ON; em28xx_init_audio_isoc(dev); } else if (dev->adev.capture_stream == STREAM_ON && arg == 0) { dev->adev.capture_stream = STREAM_OFF; em28xx_isoc_audio_deinit(dev); } else { printk(KERN_ERR "An underrun very likely occurred. " "Ignoring it.\n"); } return 0; default: return -EINVAL; } } static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, size_t size) { struct snd_pcm_runtime *runtime = subs->runtime; dprintk("Alocating vbuffer\n"); if (runtime->dma_area) { if (runtime->dma_bytes > size) return 0; vfree(runtime->dma_area); } runtime->dma_area = vmalloc(size); if (!runtime->dma_area) return -ENOMEM; runtime->dma_bytes = size; return 0; } static struct snd_pcm_hardware snd_em28xx_hw_capture = { .info = SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_MMAP_VALID, .formats = SNDRV_PCM_FMTBIT_S16_LE, .rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_KNOT, .rate_min = 48000, .rate_max = 48000, .channels_min = 2, .channels_max = 2, .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */ .period_bytes_min = 64, /* 12544/2, */ .period_bytes_max = 12544, .periods_min = 2, .periods_max = 98, /* 12544, */ }; static int snd_em28xx_capture_open(struct snd_pcm_substream *substream) { struct em28xx *dev = snd_pcm_substream_chip(substream); struct snd_pcm_runtime *runtime = substream->runtime; int ret = 0; dprintk("opening device and trying to acquire exclusive lock\n"); if (!dev) { printk(KERN_ERR "BUG: em28xx can't find device struct." " Can't proceed with open\n"); return -ENODEV; } /* Sets volume, mute, etc */ dev->mute = 0; mutex_lock(&dev->lock); ret = em28xx_audio_analog_set(dev); mutex_unlock(&dev->lock); if (ret < 0) goto err; runtime->hw = snd_em28xx_hw_capture; if (dev->alt == 0 && dev->adev.users == 0) { int errCode; dev->alt = 7; errCode = usb_set_interface(dev->udev, 0, 7); dprintk("changing alternate number to 7\n"); } dev->adev.users++; snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); dev->adev.capture_pcm_substream = substream; runtime->private_data = dev; return 0; err: printk(KERN_ERR "Error while configuring em28xx mixer\n"); return ret; } static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream) { struct em28xx *dev = snd_pcm_substream_chip(substream); dev->adev.users--; dprintk("closing device\n"); dev->mute = 1; mutex_lock(&dev->lock); em28xx_audio_analog_set(dev); mutex_unlock(&dev->lock); if (dev->adev.users == 0 && dev->adev.shutdown == 1) { dprintk("audio users: %d\n", dev->adev.users); dprintk("disabling audio stream!\n"); dev->adev.shutdown = 0; dprintk("released lock\n"); em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0); } return 0; } static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) { unsigned int channels, rate, format; int ret; dprintk("Setting capture parameters\n"); ret = snd_pcm_alloc_vmalloc_buffer(substream, params_buffer_bytes(hw_params)); format = params_format(hw_params); rate = params_rate(hw_params); channels = params_channels(hw_params); /* TODO: set up em28xx audio chip to deliver the correct audio format, current default is 48000hz multiplexed => 96000hz mono which shouldn't matter since analogue TV only supports mono */ return 0; } static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream) { struct em28xx *dev = snd_pcm_substream_chip(substream); dprintk("Stop capture, if needed\n"); if (dev->adev.capture_stream == STREAM_ON) em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 0); return 0; } static int snd_em28xx_prepare(struct snd_pcm_substream *substream) { return 0; } static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream, int cmd) { struct em28xx *dev = snd_pcm_substream_chip(substream); dprintk("Should %s capture\n", (cmd == SNDRV_PCM_TRIGGER_START)? "start": "stop"); switch (cmd) { case SNDRV_PCM_TRIGGER_START: em28xx_cmd(dev, EM28XX_CAPTURE_STREAM_EN, 1); return 0; case SNDRV_PCM_TRIGGER_STOP: dev->adev.shutdown = 1; return 0; default: return -EINVAL; } } static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream *substream) { struct em28xx *dev; snd_pcm_uframes_t hwptr_done; dev = snd_pcm_substream_chip(substream); hwptr_done = dev->adev.hwptr_done_capture; return hwptr_done; } static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, unsigned long offset) { void *pageptr = subs->runtime->dma_area + offset; return vmalloc_to_page(pageptr); } static struct snd_pcm_ops snd_em28xx_pcm_capture = { .open = snd_em28xx_capture_open, .close = snd_em28xx_pcm_close, .ioctl = snd_pcm_lib_ioctl, .hw_params = snd_em28xx_hw_capture_params, .hw_free = snd_em28xx_hw_capture_free, .prepare = snd_em28xx_prepare, .trigger = snd_em28xx_capture_trigger, .pointer = snd_em28xx_capture_pointer, .page = snd_pcm_get_vmalloc_page, }; static int em28xx_audio_init(struct em28xx *dev) { struct em28xx_audio *adev = &dev->adev; struct snd_pcm *pcm; struct snd_card *card; static int devnr; int err; if (dev->has_alsa_audio != 1) { /* This device does not support the extension (in this case the device is expecting the snd-usb-audio module or doesn't have analog audio support at all) */ return 0; } printk(KERN_INFO "em28xx-audio.c: probing for em28x1 " "non standard usbaudio\n"); printk(KERN_INFO "em28xx-audio.c: Copyright (C) 2006 Markus " "Rechberger\n"); err = snd_card_create(index[devnr], "Em28xx Audio", THIS_MODULE, 0, &card); if (err < 0) return err; spin_lock_init(&adev->slock); err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm); if (err < 0) { snd_card_free(card); return err; } snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_em28xx_pcm_capture); pcm->info_flags = 0; pcm->private_data = dev; strcpy(pcm->name, "Empia 28xx Capture"); strcpy(card->driver, "Empia Em28xx Audio"); strcpy(card->shortname, "Em28xx Audio"); strcpy(card->longname, "Empia Em28xx Audio"); err = snd_card_register(card); if (err < 0) { snd_card_free(card); return err; } adev->sndcard = card; adev->udev = dev->udev; return 0; } static int em28xx_audio_fini(struct em28xx *dev) { if (dev == NULL) return 0; if (dev->has_alsa_audio != 1) { /* This device does not support the extension (in this case the device is expecting the snd-usb-audio module or doesn't have analog audio support at all) */ return 0; } if (dev->adev.sndcard) { snd_card_free(dev->adev.sndcard); dev->adev.sndcard = NULL; } return 0; } static struct em28xx_ops audio_ops = { .id = EM28XX_AUDIO, .name = "Em28xx Audio Extension", .init = em28xx_audio_init, .fini = em28xx_audio_fini, }; static int __init em28xx_alsa_register(void) { return em28xx_register_extension(&audio_ops); } static void __exit em28xx_alsa_unregister(void) { em28xx_unregister_extension(&audio_ops); } MODULE_LICENSE("GPL"); MODULE_AUTHOR("Markus Rechberger "); MODULE_AUTHOR("Mauro Carvalho Chehab "); MODULE_DESCRIPTION("Em28xx Audio driver"); module_init(em28xx_alsa_register); module_exit(em28xx_alsa_unregister);