diff options
Diffstat (limited to 'drivers/media/usb/em28xx/em28xx-audio.c')
| -rw-r--r-- | drivers/media/usb/em28xx/em28xx-audio.c | 1070 |
1 files changed, 1070 insertions, 0 deletions
diff --git a/drivers/media/usb/em28xx/em28xx-audio.c b/drivers/media/usb/em28xx/em28xx-audio.c new file mode 100644 index 000000000..8e799ae1d --- /dev/null +++ b/drivers/media/usb/em28xx/em28xx-audio.c @@ -0,0 +1,1070 @@ +// SPDX-License-Identifier: GPL-2.0+ +// +// 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 completion 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); +} + +static int em28xx_init_audio_isoc(struct em28xx *dev) +{ + int i, err; + + 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); + + err = usb_submit_urb(dev->adev.urb[i], GFP_ATOMIC); + if (err) { + dev_err(&dev->intf->dev, + "submit of audio urb failed (error=%i)\n", + err); + em28xx_deinit_isoc_audio(dev); + atomic_set(&dev->adev.stream_started, 0); + return err; + } + } + + 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 const 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 || dev->is_audio_only) { + struct usb_device *udev; + + 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) + 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) + 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) + 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 v2"); +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); |