/* * Empiatech em28x1 audio extension * * Copyright (C) 2006 Markus Rechberger * * 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 //#include #include #include "em28xx.h" static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; static int em28xx_cmd(struct em28xx *dev, int cmd,int arg); #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,16) static int snd_pcm_alloc_vmalloc_buffer(snd_pcm_substream_t *subs, size_t size) #else static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, size_t size) #endif { #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,16) snd_pcm_runtime_t *runtime = subs->runtime; #else struct snd_pcm_runtime *runtime = subs->runtime; #endif 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; } #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,16) static snd_pcm_hardware_t snd_em28xx_hw_capture = { #else static struct snd_pcm_hardware snd_em28xx_hw_capture = { #endif .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, }; #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,16) static int snd_em28xx_capture_open(snd_pcm_substream_t *substream) #else static int snd_em28xx_capture_open(struct snd_pcm_substream *substream) #endif { int ret = 0; int mode; struct em28xx *dev = snd_pcm_substream_chip(substream); #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,16) snd_pcm_runtime_t *runtime = substream->runtime; #else struct snd_pcm_runtime *runtime = substream->runtime; #endif printk("opening radio device and trying to acquire exclusive lock\n"); switch(dev->mode){ case TUNER_STUB_DVBC_TV: case TUNER_STUB_DVBT_TV: case TUNER_STUB_ATSC_TV: /* digital has no support for analog audio */ if (ret != 0 ) { printk("device is already in use by DVB-T\n"); return -EINVAL; } else { struct v4l2_tuner tuner; printk("switching device to FM mode\n"); mode = TUNER_STUB_RADIO; memset(&tuner, 0x0, sizeof(struct v4l2_tuner)); tuner.type = V4L2_TUNER_RADIO; /* enable GPIO for analog TV */ dev->em28xx_gpio_control(dev, EM28XX_MODE, (void*)mode); dev->mode = mode; /* upload firmware */ tuner_run_cmd(dev->tobj, TUNER_CMD_INIT, (void*)mode); /* required for devices which have kerneldriver dependencies */ // em28xx_config(dev); // em28xx_config_i2c(dev); /* this is moreover to switch the decoder to FM */ em28xx_i2c_call_clients(dev, VIDIOC_S_TUNER, &tuner); dev->em28xx_write_regs(dev, 0x0f, "\x87", 1); ret = dev->em28xx_acquire(dev, EM28XX_RADIO, 1); em28xx_i2c_call_clients(dev, VIDIOC_INT_RESET, 0); /* TODO switch to FM mode */ printk("em28xx-audio: %d mode\n", mode); tuner_run_cmd(dev->tobj, TUNER_CMD_G_MODE, &mode); printk("retrieved mode from tuner: %d\n",mode); } break; case TUNER_STUB_ANALOG_TV: printk("em28xx-audio: device is currently in analog TV mode\n"); /* unmute by default */ dev->em28xx_write_regs(dev, 0x0f, "\x87", 1); break; case TUNER_STUB_RADIO: /* check current mode and put a hard lock onto it */ printk("em28xx-audio: device is currently in analogue FM mode\n"); /* unmute by default here */ dev->em28xx_write_regs(dev, 0x0f, "\x87", 1); ret = dev->em28xx_acquire(dev, EM28XX_RADIO, 1); if ( ret == 0 ) printk("device is locked in fmradio mode now\n"); break; default: printk("em28xx-audio: unhandled mode %d\n", dev->mode); } 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); printk("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; } #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,16) static int snd_em28xx_pcm_close(snd_pcm_substream_t *substream) #else static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream) #endif { struct em28xx *dev = snd_pcm_substream_chip(substream); int amode = 0; dev->adev->users--; /* decrease audio reference */ switch(dev->mode) { case TUNER_STUB_ANALOG_TV: amode = EM28XX_VIDEO; break; case TUNER_STUB_RADIO: amode = EM28XX_RADIO; break; default: printk("invalid mode: %d\n",dev->mode); break; } dev->em28xx_acquire(dev, amode, 0); if(dev->adev->users == 0 && dev->adev->shutdown == 1) { printk("audio users: %d\n",dev->adev->users); printk("disabling audio stream!\n"); dev->adev->shutdown = 0; printk("released lock\n"); em28xx_cmd(dev,EM28XX_CAPTURE_STREAM_EN,0); } return 0; } #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,16) static int snd_em28xx_hw_capture_params(snd_pcm_substream_t *substream, snd_pcm_hw_params_t *hw_params) #else static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) #endif { unsigned int channels, rate, format; int ret; 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; } #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,16) static int snd_em28xx_hw_capture_free(snd_pcm_substream_t *substream) #else static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream) #endif { struct em28xx *dev = snd_pcm_substream_chip(substream); if(dev->adev->capture_stream==STREAM_ON){ em28xx_cmd(dev,EM28XX_CAPTURE_STREAM_EN,0); } return 0; } #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,16) static int snd_em28xx_prepare(snd_pcm_substream_t *substream) #else static int snd_em28xx_prepare(struct snd_pcm_substream *substream) #endif { return 0; } #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,16) static int snd_em28xx_capture_trigger(snd_pcm_substream_t *substream, int cmd) #else static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream, int cmd) #endif { struct em28xx *dev = snd_pcm_substream_chip(substream); 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; } } #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19) static void em28xx_audio_isocirq(struct urb *urb, struct pt_regs *regs) #else static void em28xx_audio_isocirq(struct urb *urb) #endif { struct em28xx *dev=urb->context; int i; unsigned int oldptr; unsigned long flags; int period_elapsed = 0; int status; unsigned char *cp; unsigned int stride; #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,16) snd_pcm_substream_t *substream; snd_pcm_runtime_t *runtime; #else struct snd_pcm_substream *substream; struct snd_pcm_runtime *runtime; #endif if(dev->adev->capture_pcm_substream){ substream=dev->adev->capture_pcm_substream; runtime=substream->runtime; stride = runtime->frame_bits >> 3; for(i=0;inumber_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; spin_lock_irqsave(&dev->adev->slock, flags); oldptr = dev->adev->hwptr_done_capture; 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; } spin_unlock_irqrestore(&dev->adev->slock, flags); if(oldptr + length >= runtime->buffer_size){ unsigned int cnt = runtime->buffer_size-oldptr-1; memcpy(runtime->dma_area+oldptr*stride, cp , cnt*stride); memcpy(runtime->dma_area, cp + cnt, length*stride - cnt*stride); } else { memcpy(runtime->dma_area+oldptr*stride, cp, length*stride); } } if(period_elapsed){ snd_pcm_period_elapsed(substream); } } urb->status = 0; if(dev->adev->shutdown) return; if((status = usb_submit_urb(urb, GFP_ATOMIC))){ em28xx_errdev("resubmit of audio urb failed (error=%i)\n", status); } return; } static int em28xx_isoc_audio_deinit(struct em28xx *dev) { int i; for(i=0;iadev->urb[i]); usb_free_urb(dev->adev->urb[i]); dev->adev->urb[i]=NULL; } return 0; } static int em28xx_init_audio_isoc(struct em28xx *dev) { int i; int errCode; const int sb_size=EM28XX_NUM_AUDIO_PACKETS * EM28XX_AUDIO_MAX_PACKET_SIZE; for(i=0;iadev->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){ 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; jiso_frame_desc[j].offset = k; urb->iso_frame_desc[j].length=EM28XX_AUDIO_MAX_PACKET_SIZE; } dev->adev->urb[i]=urb; } else { return -ENOMEM; } } for(i=0;iadev->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) { 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("An underrun occured very likely... ignoring it\n"); } return 0; default: return -EINVAL; } } #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,16) static snd_pcm_uframes_t snd_em28xx_capture_pointer(snd_pcm_substream_t *substream) #else static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream *substream) #endif { 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; } #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,16) static struct page *snd_pcm_get_vmalloc_page(snd_pcm_substream_t *subs, unsigned long offset) #else static struct page *snd_pcm_get_vmalloc_page(struct snd_pcm_substream *subs, unsigned long offset) #endif { void *pageptr = subs->runtime->dma_area + offset; return vmalloc_to_page(pageptr); } #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,16) static snd_pcm_ops_t snd_em28xx_pcm_capture = { #else static struct snd_pcm_ops snd_em28xx_pcm_capture = { #endif .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; #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,16) snd_pcm_t *pcm; snd_card_t *card; #else struct snd_pcm *pcm; struct snd_card *card; #endif static int devnr; int ret; int err; printk("em28xx-audio.c: probing for em28x1 non standard usbaudio\n"); printk("em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n"); adev=kzalloc(sizeof(*adev),GFP_KERNEL); if(!adev){ printk("em28xx-audio.c: out of memory\n"); return -1; } card = snd_card_new(index[devnr], "Em28xx Audio", THIS_MODULE,0); if(card==NULL){ kfree(adev); return -ENOMEM; } spin_lock_init(&adev->slock); ret=snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm); 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"); if((err = snd_card_register(card))<0){ snd_card_free(card); return -ENOMEM; } adev->sndcard=card; adev->udev=dev->udev; dev->adev=adev; return 0; } static int em28xx_audio_fini(struct em28xx *dev) { if(dev==NULL) return 0; if(dev->adev){ snd_card_free(dev->adev->sndcard); kfree(dev->adev); dev->adev=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) { request_module("em28xx"); request_module("tuner"); 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_DESCRIPTION("Em28xx Audio driver"); module_init(em28xx_alsa_register); module_exit(em28xx_alsa_unregister);