| /* |
| * Empiatech em28x1 audio extension |
| * |
| * Copyright (C) 2006 Markus Rechberger <mrechberger@gmail.com> |
| * |
| * Copyright (C) 2007-2016 Mauro Carvalho Chehab |
| * - Port to work with the in-kernel driver |
| * - Cleanups, fixes, alsa-controls, etc. |
| * |
| * 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. |
| */ |
| |
| #include "em28xx.h" |
| |
| #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/module.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 <sound/tlv.h> |
| #include <sound/ac97_codec.h> |
| #include <media/v4l2-common.h> |
| |
| static int debug; |
| module_param(debug, int, 0644); |
| MODULE_PARM_DESC(debug, "activates debug info"); |
| |
| #define EM28XX_MAX_AUDIO_BUFS 5 |
| #define EM28XX_MIN_AUDIO_PACKETS 64 |
| |
| #define dprintk(fmt, arg...) do { \ |
| if (debug) \ |
| dev_printk(KERN_DEBUG, &dev->intf->dev, \ |
| "video: %s: " fmt, __func__, ## arg); \ |
| } while (0) |
| |
| static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; |
| |
| static int em28xx_deinit_isoc_audio(struct em28xx *dev) |
| { |
| int i; |
| |
| dprintk("Stopping isoc\n"); |
| for (i = 0; i < dev->adev.num_urb; i++) { |
| struct urb *urb = dev->adev.urb[i]; |
| |
| if (!irqs_disabled()) |
| usb_kill_urb(urb); |
| else |
| usb_unlink_urb(urb); |
| } |
| |
| 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->disconnected) { |
| dprintk("device disconnected while streaming. URB status=%d.\n", |
| urb->status); |
| atomic_set(&dev->adev.stream_started, 0); |
| return; |
| } |
| |
| switch (urb->status) { |
| case 0: /* success */ |
| case -ETIMEDOUT: /* NAK */ |
| break; |
| case -ECONNRESET: /* kill */ |
| case -ENOENT: |
| case -ESHUTDOWN: |
| return; |
| default: /* error */ |
| dprintk("urb completition error %d.\n", urb->status); |
| break; |
| } |
| |
| if (atomic_read(&dev->adev.stream_started) == 0) |
| return; |
| |
| 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; |
| |
| status = usb_submit_urb(urb, GFP_ATOMIC); |
| if (status < 0) |
| dev_err(&dev->intf->dev, |
| "resubmit of audio urb failed (error=%i)\n", |
| status); |
| return; |
| } |
| |
| static int em28xx_init_audio_isoc(struct em28xx *dev) |
| { |
| int i, errCode; |
| |
| dprintk("Starting isoc transfers\n"); |
| |
| /* Start streaming */ |
| for (i = 0; i < dev->adev.num_urb; i++) { |
| memset(dev->adev.transfer_buffer[i], 0x80, |
| dev->adev.urb[i]->transfer_buffer_length); |
| |
| errCode = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); |
| if (errCode) { |
| dev_err(&dev->intf->dev, |
| "submit of audio urb failed (error=%i)\n", |
| errCode); |
| em28xx_deinit_isoc_audio(dev); |
| atomic_set(&dev->adev.stream_started, 0); |
| return errCode; |
| } |
| |
| } |
| |
| return 0; |
| } |
| |
| static int snd_pcm_alloc_vmalloc_buffer(struct snd_pcm_substream *subs, |
| size_t size) |
| { |
| struct em28xx *dev = snd_pcm_substream_chip(subs); |
| struct snd_pcm_runtime *runtime = subs->runtime; |
| |
| dprintk("Allocating 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_BATCH | |
| SNDRV_PCM_INFO_MMAP_VALID, |
| |
| .formats = SNDRV_PCM_FMTBIT_S16_LE, |
| |
| .rates = SNDRV_PCM_RATE_48000, |
| |
| .rate_min = 48000, |
| .rate_max = 48000, |
| .channels_min = 2, |
| .channels_max = 2, |
| .buffer_bytes_max = 62720 * 8, /* just about the value in usbaudio.c */ |
| |
| /* |
| * The period is 12.288 bytes. Allow a 10% of variation along its |
| * value, in order to avoid overruns/underruns due to some clock |
| * drift. |
| * |
| * FIXME: This period assumes 64 packets, and a 48000 PCM rate. |
| * Calculate it dynamically. |
| */ |
| .period_bytes_min = 11059, |
| .period_bytes_max = 13516, |
| |
| .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 nonblock, ret = 0; |
| |
| if (!dev) { |
| pr_err("em28xx-audio: BUG: em28xx can't find device struct. Can't proceed with open\n"); |
| return -ENODEV; |
| } |
| |
| if (dev->disconnected) |
| return -ENODEV; |
| |
| dprintk("opening device and trying to acquire exclusive lock\n"); |
| |
| nonblock = !!(substream->f_flags & O_NONBLOCK); |
| if (nonblock) { |
| if (!mutex_trylock(&dev->lock)) |
| return -EAGAIN; |
| } else |
| mutex_lock(&dev->lock); |
| |
| runtime->hw = snd_em28xx_hw_capture; |
| |
| if (dev->adev.users == 0) { |
| if (dev->alt == 0 || dev->is_audio_only) { |
| struct usb_device *udev = interface_to_usbdev(dev->intf); |
| |
| if (dev->is_audio_only) |
| /* audio is on a separate interface */ |
| dev->alt = 1; |
| else |
| /* audio is on the same interface as video */ |
| dev->alt = 7; |
| /* |
| * FIXME: The intention seems to be to select |
| * the alt setting with the largest |
| * wMaxPacketSize for the video endpoint. |
| * At least dev->alt should be used instead, but |
| * we should probably not touch it at all if it |
| * is already >0, because wMaxPacketSize of the |
| * audio endpoints seems to be the same for all. |
| */ |
| dprintk("changing alternate number on interface %d to %d\n", |
| dev->ifnum, dev->alt); |
| usb_set_interface(udev, dev->ifnum, dev->alt); |
| } |
| |
| /* Sets volume, mute, etc */ |
| dev->mute = 0; |
| ret = em28xx_audio_analog_set(dev); |
| if (ret < 0) |
| goto err; |
| } |
| |
| kref_get(&dev->ref); |
| dev->adev.users++; |
| mutex_unlock(&dev->lock); |
| |
| /* Dynamically adjust the period size */ |
| snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); |
| snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES, |
| dev->adev.period * 95 / 100, |
| dev->adev.period * 105 / 100); |
| |
| dev->adev.capture_pcm_substream = substream; |
| |
| return 0; |
| err: |
| mutex_unlock(&dev->lock); |
| |
| dev_err(&dev->intf->dev, |
| "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); |
| |
| dprintk("closing device\n"); |
| |
| dev->mute = 1; |
| mutex_lock(&dev->lock); |
| dev->adev.users--; |
| if (atomic_read(&dev->adev.stream_started) > 0) { |
| atomic_set(&dev->adev.stream_started, 0); |
| schedule_work(&dev->adev.wq_trigger); |
| } |
| |
| em28xx_audio_analog_set(dev); |
| if (substream->runtime->dma_area) { |
| dprintk("freeing\n"); |
| vfree(substream->runtime->dma_area); |
| substream->runtime->dma_area = NULL; |
| } |
| mutex_unlock(&dev->lock); |
| kref_put(&dev->ref, em28xx_free_device); |
| |
| return 0; |
| } |
| |
| static int snd_em28xx_hw_capture_params(struct snd_pcm_substream *substream, |
| struct snd_pcm_hw_params *hw_params) |
| { |
| int ret; |
| struct em28xx *dev = snd_pcm_substream_chip(substream); |
| |
| if (dev->disconnected) |
| return -ENODEV; |
| |
| dprintk("Setting capture parameters\n"); |
| |
| ret = snd_pcm_alloc_vmalloc_buffer(substream, |
| params_buffer_bytes(hw_params)); |
| if (ret < 0) |
| return ret; |
| #if 0 |
| /* 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 */ |
| unsigned int channels, rate, format; |
| |
| format = params_format(hw_params); |
| rate = params_rate(hw_params); |
| channels = params_channels(hw_params); |
| #endif |
| |
| return 0; |
| } |
| |
| static int snd_em28xx_hw_capture_free(struct snd_pcm_substream *substream) |
| { |
| struct em28xx *dev = snd_pcm_substream_chip(substream); |
| struct em28xx_audio *adev = &dev->adev; |
| |
| dprintk("Stop capture, if needed\n"); |
| |
| if (atomic_read(&adev->stream_started) > 0) { |
| atomic_set(&adev->stream_started, 0); |
| schedule_work(&adev->wq_trigger); |
| } |
| |
| return 0; |
| } |
| |
| static int snd_em28xx_prepare(struct snd_pcm_substream *substream) |
| { |
| struct em28xx *dev = snd_pcm_substream_chip(substream); |
| |
| if (dev->disconnected) |
| return -ENODEV; |
| |
| dev->adev.hwptr_done_capture = 0; |
| dev->adev.capture_transfer_done = 0; |
| |
| return 0; |
| } |
| |
| static void audio_trigger(struct work_struct *work) |
| { |
| struct em28xx_audio *adev = |
| container_of(work, struct em28xx_audio, wq_trigger); |
| struct em28xx *dev = container_of(adev, struct em28xx, adev); |
| |
| if (atomic_read(&adev->stream_started)) { |
| dprintk("starting capture"); |
| em28xx_init_audio_isoc(dev); |
| } else { |
| dprintk("stopping capture"); |
| em28xx_deinit_isoc_audio(dev); |
| } |
| } |
| |
| static int snd_em28xx_capture_trigger(struct snd_pcm_substream *substream, |
| int cmd) |
| { |
| struct em28xx *dev = snd_pcm_substream_chip(substream); |
| int retval = 0; |
| |
| if (dev->disconnected) |
| return -ENODEV; |
| |
| switch (cmd) { |
| case SNDRV_PCM_TRIGGER_PAUSE_RELEASE: /* fall through */ |
| case SNDRV_PCM_TRIGGER_RESUME: /* fall through */ |
| case SNDRV_PCM_TRIGGER_START: |
| atomic_set(&dev->adev.stream_started, 1); |
| break; |
| case SNDRV_PCM_TRIGGER_PAUSE_PUSH: /* fall through */ |
| case SNDRV_PCM_TRIGGER_SUSPEND: /* fall through */ |
| case SNDRV_PCM_TRIGGER_STOP: |
| atomic_set(&dev->adev.stream_started, 0); |
| break; |
| default: |
| retval = -EINVAL; |
| } |
| schedule_work(&dev->adev.wq_trigger); |
| return retval; |
| } |
| |
| static snd_pcm_uframes_t snd_em28xx_capture_pointer(struct snd_pcm_substream |
| *substream) |
| { |
| unsigned long flags; |
| struct em28xx *dev; |
| snd_pcm_uframes_t hwptr_done; |
| |
| dev = snd_pcm_substream_chip(substream); |
| if (dev->disconnected) |
| return SNDRV_PCM_POS_XRUN; |
| |
| spin_lock_irqsave(&dev->adev.slock, flags); |
| hwptr_done = dev->adev.hwptr_done_capture; |
| spin_unlock_irqrestore(&dev->adev.slock, flags); |
| |
| 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); |
| } |
| |
| /* |
| * AC97 volume control support |
| */ |
| static int em28xx_vol_info(struct snd_kcontrol *kcontrol, |
| struct snd_ctl_elem_info *info) |
| { |
| struct em28xx *dev = snd_kcontrol_chip(kcontrol); |
| |
| if (dev->disconnected) |
| return -ENODEV; |
| |
| info->type = SNDRV_CTL_ELEM_TYPE_INTEGER; |
| info->count = 2; |
| info->value.integer.min = 0; |
| info->value.integer.max = 0x1f; |
| |
| return 0; |
| } |
| |
| static int em28xx_vol_put(struct snd_kcontrol *kcontrol, |
| struct snd_ctl_elem_value *value) |
| { |
| struct em28xx *dev = snd_kcontrol_chip(kcontrol); |
| struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; |
| u16 val = (0x1f - (value->value.integer.value[0] & 0x1f)) | |
| (0x1f - (value->value.integer.value[1] & 0x1f)) << 8; |
| int nonblock = 0; |
| int rc; |
| |
| if (dev->disconnected) |
| return -ENODEV; |
| |
| if (substream) |
| nonblock = !!(substream->f_flags & O_NONBLOCK); |
| if (nonblock) { |
| if (!mutex_trylock(&dev->lock)) |
| return -EAGAIN; |
| } else |
| mutex_lock(&dev->lock); |
| rc = em28xx_read_ac97(dev, kcontrol->private_value); |
| if (rc < 0) |
| goto err; |
| |
| val |= rc & 0x8000; /* Preserve the mute flag */ |
| |
| rc = em28xx_write_ac97(dev, kcontrol->private_value, val); |
| if (rc < 0) |
| goto err; |
| |
| dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n", |
| (val & 0x8000) ? "muted " : "", |
| 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), |
| val, (int)kcontrol->private_value); |
| |
| err: |
| mutex_unlock(&dev->lock); |
| return rc; |
| } |
| |
| static int em28xx_vol_get(struct snd_kcontrol *kcontrol, |
| struct snd_ctl_elem_value *value) |
| { |
| struct em28xx *dev = snd_kcontrol_chip(kcontrol); |
| struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; |
| int nonblock = 0; |
| int val; |
| |
| if (dev->disconnected) |
| return -ENODEV; |
| |
| if (substream) |
| nonblock = !!(substream->f_flags & O_NONBLOCK); |
| if (nonblock) { |
| if (!mutex_trylock(&dev->lock)) |
| return -EAGAIN; |
| } else |
| mutex_lock(&dev->lock); |
| val = em28xx_read_ac97(dev, kcontrol->private_value); |
| mutex_unlock(&dev->lock); |
| if (val < 0) |
| return val; |
| |
| dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n", |
| (val & 0x8000) ? "muted " : "", |
| 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), |
| val, (int)kcontrol->private_value); |
| |
| value->value.integer.value[0] = 0x1f - (val & 0x1f); |
| value->value.integer.value[1] = 0x1f - ((val << 8) & 0x1f); |
| |
| return 0; |
| } |
| |
| static int em28xx_vol_put_mute(struct snd_kcontrol *kcontrol, |
| struct snd_ctl_elem_value *value) |
| { |
| struct em28xx *dev = snd_kcontrol_chip(kcontrol); |
| u16 val = value->value.integer.value[0]; |
| struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; |
| int nonblock = 0; |
| int rc; |
| |
| if (dev->disconnected) |
| return -ENODEV; |
| |
| if (substream) |
| nonblock = !!(substream->f_flags & O_NONBLOCK); |
| if (nonblock) { |
| if (!mutex_trylock(&dev->lock)) |
| return -EAGAIN; |
| } else |
| mutex_lock(&dev->lock); |
| rc = em28xx_read_ac97(dev, kcontrol->private_value); |
| if (rc < 0) |
| goto err; |
| |
| if (val) |
| rc &= 0x1f1f; |
| else |
| rc |= 0x8000; |
| |
| rc = em28xx_write_ac97(dev, kcontrol->private_value, rc); |
| if (rc < 0) |
| goto err; |
| |
| dprintk("%sleft vol %d, right vol %d (0x%04x) to ac97 volume control 0x%04x\n", |
| (val & 0x8000) ? "muted " : "", |
| 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), |
| val, (int)kcontrol->private_value); |
| |
| err: |
| mutex_unlock(&dev->lock); |
| return rc; |
| } |
| |
| static int em28xx_vol_get_mute(struct snd_kcontrol *kcontrol, |
| struct snd_ctl_elem_value *value) |
| { |
| struct em28xx *dev = snd_kcontrol_chip(kcontrol); |
| struct snd_pcm_substream *substream = dev->adev.capture_pcm_substream; |
| int nonblock = 0; |
| int val; |
| |
| if (dev->disconnected) |
| return -ENODEV; |
| |
| if (substream) |
| nonblock = !!(substream->f_flags & O_NONBLOCK); |
| if (nonblock) { |
| if (!mutex_trylock(&dev->lock)) |
| return -EAGAIN; |
| } else |
| mutex_lock(&dev->lock); |
| val = em28xx_read_ac97(dev, kcontrol->private_value); |
| mutex_unlock(&dev->lock); |
| if (val < 0) |
| return val; |
| |
| if (val & 0x8000) |
| value->value.integer.value[0] = 0; |
| else |
| value->value.integer.value[0] = 1; |
| |
| dprintk("%sleft vol %d, right vol %d (0x%04x) from ac97 volume control 0x%04x\n", |
| (val & 0x8000) ? "muted " : "", |
| 0x1f - ((val >> 8) & 0x1f), 0x1f - (val & 0x1f), |
| val, (int)kcontrol->private_value); |
| |
| return 0; |
| } |
| |
| static const DECLARE_TLV_DB_SCALE(em28xx_db_scale, -3450, 150, 0); |
| |
| static int em28xx_cvol_new(struct snd_card *card, struct em28xx *dev, |
| char *name, int id) |
| { |
| int err; |
| char ctl_name[44]; |
| struct snd_kcontrol *kctl; |
| struct snd_kcontrol_new tmp; |
| |
| memset(&tmp, 0, sizeof(tmp)); |
| tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER, |
| tmp.private_value = id, |
| tmp.name = ctl_name, |
| |
| /* Add Mute Control */ |
| sprintf(ctl_name, "%s Switch", name); |
| tmp.get = em28xx_vol_get_mute; |
| tmp.put = em28xx_vol_put_mute; |
| tmp.info = snd_ctl_boolean_mono_info; |
| kctl = snd_ctl_new1(&tmp, dev); |
| err = snd_ctl_add(card, kctl); |
| if (err < 0) |
| return err; |
| dprintk("Added control %s for ac97 volume control 0x%04x\n", |
| ctl_name, id); |
| |
| memset(&tmp, 0, sizeof(tmp)); |
| tmp.iface = SNDRV_CTL_ELEM_IFACE_MIXER, |
| tmp.private_value = id, |
| tmp.name = ctl_name, |
| |
| /* Add Volume Control */ |
| sprintf(ctl_name, "%s Volume", name); |
| tmp.get = em28xx_vol_get; |
| tmp.put = em28xx_vol_put; |
| tmp.info = em28xx_vol_info; |
| tmp.tlv.p = em28xx_db_scale, |
| kctl = snd_ctl_new1(&tmp, dev); |
| err = snd_ctl_add(card, kctl); |
| if (err < 0) |
| return err; |
| dprintk("Added control %s for ac97 volume control 0x%04x\n", |
| ctl_name, id); |
| |
| return 0; |
| } |
| |
| /* |
| * register/unregister code and data |
| */ |
| static const 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 void em28xx_audio_free_urb(struct em28xx *dev) |
| { |
| struct usb_device *udev = interface_to_usbdev(dev->intf); |
| int i; |
| |
| for (i = 0; i < dev->adev.num_urb; i++) { |
| struct urb *urb = dev->adev.urb[i]; |
| |
| if (!urb) |
| continue; |
| |
| usb_free_coherent(udev, urb->transfer_buffer_length, |
| dev->adev.transfer_buffer[i], |
| urb->transfer_dma); |
| |
| usb_free_urb(urb); |
| } |
| kfree(dev->adev.urb); |
| kfree(dev->adev.transfer_buffer); |
| dev->adev.num_urb = 0; |
| } |
| |
| /* high bandwidth multiplier, as encoded in highspeed endpoint descriptors */ |
| static int em28xx_audio_ep_packet_size(struct usb_device *udev, |
| struct usb_endpoint_descriptor *e) |
| { |
| int size = le16_to_cpu(e->wMaxPacketSize); |
| |
| if (udev->speed == USB_SPEED_HIGH) |
| return (size & 0x7ff) * (1 + (((size) >> 11) & 0x03)); |
| |
| return size & 0x7ff; |
| } |
| |
| static int em28xx_audio_urb_init(struct em28xx *dev) |
| { |
| struct usb_interface *intf; |
| struct usb_endpoint_descriptor *e, *ep = NULL; |
| struct usb_device *udev = interface_to_usbdev(dev->intf); |
| int i, ep_size, interval, num_urb, npackets; |
| int urb_size, bytes_per_transfer; |
| u8 alt; |
| |
| if (dev->ifnum) |
| alt = 1; |
| else |
| alt = 7; |
| |
| intf = usb_ifnum_to_if(udev, dev->ifnum); |
| |
| if (intf->num_altsetting <= alt) { |
| dev_err(&dev->intf->dev, "alt %d doesn't exist on interface %d\n", |
| dev->ifnum, alt); |
| return -ENODEV; |
| } |
| |
| for (i = 0; i < intf->altsetting[alt].desc.bNumEndpoints; i++) { |
| e = &intf->altsetting[alt].endpoint[i].desc; |
| if (!usb_endpoint_dir_in(e)) |
| continue; |
| if (e->bEndpointAddress == EM28XX_EP_AUDIO) { |
| ep = e; |
| break; |
| } |
| } |
| |
| if (!ep) { |
| dev_err(&dev->intf->dev, "Couldn't find an audio endpoint"); |
| return -ENODEV; |
| } |
| |
| ep_size = em28xx_audio_ep_packet_size(udev, ep); |
| interval = 1 << (ep->bInterval - 1); |
| |
| dev_info(&dev->intf->dev, |
| "Endpoint 0x%02x %s on intf %d alt %d interval = %d, size %d\n", |
| EM28XX_EP_AUDIO, usb_speed_string(udev->speed), |
| dev->ifnum, alt, interval, ep_size); |
| |
| /* Calculate the number and size of URBs to better fit the audio samples */ |
| |
| /* |
| * Estimate the number of bytes per DMA transfer. |
| * |
| * This is given by the bit rate (for now, only 48000 Hz) multiplied |
| * by 2 channels and 2 bytes/sample divided by the number of microframe |
| * intervals and by the microframe rate (125 us) |
| */ |
| bytes_per_transfer = DIV_ROUND_UP(48000 * 2 * 2, 125 * interval); |
| |
| /* |
| * Estimate the number of transfer URBs. Don't let it go past the |
| * maximum number of URBs that is known to be supported by the device. |
| */ |
| num_urb = DIV_ROUND_UP(bytes_per_transfer, ep_size); |
| if (num_urb > EM28XX_MAX_AUDIO_BUFS) |
| num_urb = EM28XX_MAX_AUDIO_BUFS; |
| |
| /* |
| * Now that we know the number of bytes per transfer and the number of |
| * URBs, estimate the typical size of an URB, in order to adjust the |
| * minimal number of packets. |
| */ |
| urb_size = bytes_per_transfer / num_urb; |
| |
| /* |
| * Now, calculate the amount of audio packets to be filled on each |
| * URB. In order to preserve the old behaviour, use a minimal |
| * threshold for this value. |
| */ |
| npackets = EM28XX_MIN_AUDIO_PACKETS; |
| if (urb_size > ep_size * npackets) |
| npackets = DIV_ROUND_UP(urb_size, ep_size); |
| |
| dev_info(&dev->intf->dev, |
| "Number of URBs: %d, with %d packets and %d size\n", |
| num_urb, npackets, urb_size); |
| |
| /* Estimate the bytes per period */ |
| dev->adev.period = urb_size * npackets; |
| |
| /* Allocate space to store the number of URBs to be used */ |
| |
| dev->adev.transfer_buffer = kcalloc(num_urb, |
| sizeof(*dev->adev.transfer_buffer), |
| GFP_ATOMIC); |
| if (!dev->adev.transfer_buffer) { |
| return -ENOMEM; |
| } |
| |
| dev->adev.urb = kcalloc(num_urb, sizeof(*dev->adev.urb), GFP_ATOMIC); |
| if (!dev->adev.urb) { |
| kfree(dev->adev.transfer_buffer); |
| return -ENOMEM; |
| } |
| |
| /* Alloc memory for each URB and for each transfer buffer */ |
| dev->adev.num_urb = num_urb; |
| for (i = 0; i < num_urb; i++) { |
| struct urb *urb; |
| int j, k; |
| void *buf; |
| |
| urb = usb_alloc_urb(npackets, GFP_ATOMIC); |
| if (!urb) { |
| em28xx_audio_free_urb(dev); |
| return -ENOMEM; |
| } |
| dev->adev.urb[i] = urb; |
| |
| buf = usb_alloc_coherent(udev, npackets * ep_size, GFP_ATOMIC, |
| &urb->transfer_dma); |
| if (!buf) { |
| dev_err(&dev->intf->dev, |
| "usb_alloc_coherent failed!\n"); |
| em28xx_audio_free_urb(dev); |
| return -ENOMEM; |
| } |
| dev->adev.transfer_buffer[i] = buf; |
| |
| urb->dev = udev; |
| urb->context = dev; |
| urb->pipe = usb_rcvisocpipe(udev, EM28XX_EP_AUDIO); |
| urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; |
| urb->transfer_buffer = buf; |
| urb->interval = interval; |
| urb->complete = em28xx_audio_isocirq; |
| urb->number_of_packets = npackets; |
| urb->transfer_buffer_length = ep_size * npackets; |
| |
| for (j = k = 0; j < npackets; j++, k += ep_size) { |
| urb->iso_frame_desc[j].offset = k; |
| urb->iso_frame_desc[j].length = ep_size; |
| } |
| } |
| |
| return 0; |
| } |
| |
| static int em28xx_audio_init(struct em28xx *dev) |
| { |
| struct em28xx_audio *adev = &dev->adev; |
| struct usb_device *udev = interface_to_usbdev(dev->intf); |
| struct snd_pcm *pcm; |
| struct snd_card *card; |
| static int devnr; |
| int err; |
| |
| if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) { |
| /* 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; |
| } |
| |
| dev_info(&dev->intf->dev, "Binding audio extension\n"); |
| |
| kref_get(&dev->ref); |
| |
| dev_info(&dev->intf->dev, |
| "em28xx-audio.c: Copyright (C) 2006 Markus Rechberger\n"); |
| dev_info(&dev->intf->dev, |
| "em28xx-audio.c: Copyright (C) 2007-2016 Mauro Carvalho Chehab\n"); |
| |
| err = snd_card_new(&dev->intf->dev, index[devnr], "Em28xx Audio", |
| THIS_MODULE, 0, &card); |
| if (err < 0) |
| return err; |
| |
| spin_lock_init(&adev->slock); |
| adev->sndcard = card; |
| adev->udev = udev; |
| |
| err = snd_pcm_new(card, "Em28xx Audio", 0, 0, 1, &pcm); |
| if (err < 0) |
| goto card_free; |
| |
| 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, "Em28xx-Audio"); |
| strcpy(card->shortname, "Em28xx Audio"); |
| strcpy(card->longname, "Empia Em28xx Audio"); |
| |
| INIT_WORK(&adev->wq_trigger, audio_trigger); |
| |
| if (dev->audio_mode.ac97 != EM28XX_NO_AC97) { |
| em28xx_cvol_new(card, dev, "Video", AC97_VIDEO); |
| em28xx_cvol_new(card, dev, "Line In", AC97_LINE); |
| em28xx_cvol_new(card, dev, "Phone", AC97_PHONE); |
| em28xx_cvol_new(card, dev, "Microphone", AC97_MIC); |
| em28xx_cvol_new(card, dev, "CD", AC97_CD); |
| em28xx_cvol_new(card, dev, "AUX", AC97_AUX); |
| em28xx_cvol_new(card, dev, "PCM", AC97_PCM); |
| |
| em28xx_cvol_new(card, dev, "Master", AC97_MASTER); |
| em28xx_cvol_new(card, dev, "Line", AC97_HEADPHONE); |
| em28xx_cvol_new(card, dev, "Mono", AC97_MASTER_MONO); |
| em28xx_cvol_new(card, dev, "LFE", AC97_CENTER_LFE_MASTER); |
| em28xx_cvol_new(card, dev, "Surround", AC97_SURROUND_MASTER); |
| } |
| |
| err = em28xx_audio_urb_init(dev); |
| if (err) |
| goto card_free; |
| |
| err = snd_card_register(card); |
| if (err < 0) |
| goto urb_free; |
| |
| dev_info(&dev->intf->dev, "Audio extension successfully initialized\n"); |
| return 0; |
| |
| urb_free: |
| em28xx_audio_free_urb(dev); |
| |
| card_free: |
| snd_card_free(card); |
| adev->sndcard = NULL; |
| |
| return err; |
| } |
| |
| static int em28xx_audio_fini(struct em28xx *dev) |
| { |
| if (dev == NULL) |
| return 0; |
| |
| if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) { |
| /* 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; |
| } |
| |
| dev_info(&dev->intf->dev, "Closing audio extension\n"); |
| |
| if (dev->adev.sndcard) { |
| snd_card_disconnect(dev->adev.sndcard); |
| flush_work(&dev->adev.wq_trigger); |
| |
| em28xx_audio_free_urb(dev); |
| |
| snd_card_free(dev->adev.sndcard); |
| dev->adev.sndcard = NULL; |
| } |
| |
| kref_put(&dev->ref, em28xx_free_device); |
| return 0; |
| } |
| |
| static int em28xx_audio_suspend(struct em28xx *dev) |
| { |
| if (dev == NULL) |
| return 0; |
| |
| if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) |
| return 0; |
| |
| dev_info(&dev->intf->dev, "Suspending audio extension\n"); |
| em28xx_deinit_isoc_audio(dev); |
| atomic_set(&dev->adev.stream_started, 0); |
| return 0; |
| } |
| |
| static int em28xx_audio_resume(struct em28xx *dev) |
| { |
| if (dev == NULL) |
| return 0; |
| |
| if (dev->usb_audio_type != EM28XX_USB_AUDIO_VENDOR) |
| return 0; |
| |
| dev_info(&dev->intf->dev, "Resuming audio extension\n"); |
| /* Nothing to do other than schedule_work() ?? */ |
| schedule_work(&dev->adev.wq_trigger); |
| return 0; |
| } |
| |
| static struct em28xx_ops audio_ops = { |
| .id = EM28XX_AUDIO, |
| .name = "Em28xx Audio Extension", |
| .init = em28xx_audio_init, |
| .fini = em28xx_audio_fini, |
| .suspend = em28xx_audio_suspend, |
| .resume = em28xx_audio_resume, |
| }; |
| |
| 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 <mrechberger@gmail.com>"); |
| MODULE_AUTHOR("Mauro Carvalho Chehab"); |
| MODULE_DESCRIPTION(DRIVER_DESC " - audio interface"); |
| MODULE_VERSION(EM28XX_VERSION); |
| |
| module_init(em28xx_alsa_register); |
| module_exit(em28xx_alsa_unregister); |