diff options
Diffstat (limited to 'drivers/media/video/em28xx/em28xx-audio.c')
| -rw-r--r-- | drivers/media/video/em28xx/em28xx-audio.c | 474 |
1 files changed, 474 insertions, 0 deletions
diff --git a/drivers/media/video/em28xx/em28xx-audio.c b/drivers/media/video/em28xx/em28xx-audio.c new file mode 100644 index 000000000000..e1e1eda517a7 --- /dev/null +++ b/drivers/media/video/em28xx/em28xx-audio.c @@ -0,0 +1,474 @@ +/* + * Empiatech em28x1 audio extension + * + * Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com> + * + * 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 <linux/kernel.h> +#include <linux/usb.h> +#include <linux/init.h> +#include <linux/sound.h> +#include <linux/spinlock.h> +#include <linux/soundcard.h> +#include <linux/slab.h> +#include <linux/vmalloc.h> +#include <linux/proc_fs.h> +#include <linux/moduleparam.h> +#include <sound/driver.h> +#include <sound/core.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/info.h> +#include <sound/initval.h> +#include <sound/control.h> +//#include <linux/video_decoder.h> +//#include <media/tuner.h> +#include <media/v4l2-common.h> +#include "em28xx.h" + +static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; +static int em28xx_cmd(struct em28xx *dev, int cmd,int arg); + + +static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, size_t size) +{ + struct snd_pcm_runtime *runtime = subs->runtime; + 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) +{ + int ret = 0; + int mode; + struct em28xx *dev = snd_pcm_substream_chip(substream); + struct snd_pcm_runtime *runtime = substream->runtime; + 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; +} + +static int snd_em28xx_pcm_close(struct snd_pcm_substream *substream) +{ + 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; +} + +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; + 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); + 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); + 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 void em28xx_audio_isocirq(struct urb *urb) +{ + 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; + 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; + + 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;i<EM28XX_AUDIO_BUFS;i++){ + usb_kill_urb(dev->adev->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;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){ + 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; + } else { + return -ENOMEM; + } + } + 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) +{ + 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; + } +} + +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; + struct snd_pcm *pcm; + struct snd_card *card; + 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 <mrechberger@gmail.com>"); +MODULE_DESCRIPTION("Em28xx Audio driver"); + +module_init(em28xx_alsa_register); +module_exit(em28xx_alsa_unregister); |