| /* |
| * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include <linux/gfp.h> |
| #include <linux/init.h> |
| #include <linux/ratelimit.h> |
| #include <linux/usb.h> |
| #include <linux/usb/audio.h> |
| #include <linux/slab.h> |
| |
| #include <sound/core.h> |
| #include <sound/pcm.h> |
| #include <sound/pcm_params.h> |
| |
| #include "usbaudio.h" |
| #include "helper.h" |
| #include "card.h" |
| #include "endpoint.h" |
| #include "pcm.h" |
| #include "quirks.h" |
| |
| #define EP_FLAG_RUNNING 1 |
| #define EP_FLAG_STOPPING 2 |
| |
| /* |
| * snd_usb_endpoint is a model that abstracts everything related to an |
| * USB endpoint and its streaming. |
| * |
| * There are functions to activate and deactivate the streaming URBs and |
| * optional callbacks to let the pcm logic handle the actual content of the |
| * packets for playback and record. Thus, the bus streaming and the audio |
| * handlers are fully decoupled. |
| * |
| * There are two different types of endpoints in audio applications. |
| * |
| * SND_USB_ENDPOINT_TYPE_DATA handles full audio data payload for both |
| * inbound and outbound traffic. |
| * |
| * SND_USB_ENDPOINT_TYPE_SYNC endpoints are for inbound traffic only and |
| * expect the payload to carry Q10.14 / Q16.16 formatted sync information |
| * (3 or 4 bytes). |
| * |
| * Each endpoint has to be configured prior to being used by calling |
| * snd_usb_endpoint_set_params(). |
| * |
| * The model incorporates a reference counting, so that multiple users |
| * can call snd_usb_endpoint_start() and snd_usb_endpoint_stop(), and |
| * only the first user will effectively start the URBs, and only the last |
| * one to stop it will tear the URBs down again. |
| */ |
| |
| /* |
| * convert a sampling rate into our full speed format (fs/1000 in Q16.16) |
| * this will overflow at approx 524 kHz |
| */ |
| static inline unsigned get_usb_full_speed_rate(unsigned int rate) |
| { |
| return ((rate << 13) + 62) / 125; |
| } |
| |
| /* |
| * convert a sampling rate into USB high speed format (fs/8000 in Q16.16) |
| * this will overflow at approx 4 MHz |
| */ |
| static inline unsigned get_usb_high_speed_rate(unsigned int rate) |
| { |
| return ((rate << 10) + 62) / 125; |
| } |
| |
| /* |
| * release a urb data |
| */ |
| static void release_urb_ctx(struct snd_urb_ctx *u) |
| { |
| if (u->buffer_size) |
| usb_free_coherent(u->ep->chip->dev, u->buffer_size, |
| u->urb->transfer_buffer, |
| u->urb->transfer_dma); |
| usb_free_urb(u->urb); |
| u->urb = NULL; |
| } |
| |
| static const char *usb_error_string(int err) |
| { |
| switch (err) { |
| case -ENODEV: |
| return "no device"; |
| case -ENOENT: |
| return "endpoint not enabled"; |
| case -EPIPE: |
| return "endpoint stalled"; |
| case -ENOSPC: |
| return "not enough bandwidth"; |
| case -ESHUTDOWN: |
| return "device disabled"; |
| case -EHOSTUNREACH: |
| return "device suspended"; |
| case -EINVAL: |
| case -EAGAIN: |
| case -EFBIG: |
| case -EMSGSIZE: |
| return "internal error"; |
| default: |
| return "unknown error"; |
| } |
| } |
| |
| /** |
| * snd_usb_endpoint_implicit_feedback_sink: Report endpoint usage type |
| * |
| * @ep: The snd_usb_endpoint |
| * |
| * Determine whether an endpoint is driven by an implicit feedback |
| * data endpoint source. |
| */ |
| int snd_usb_endpoint_implicit_feedback_sink(struct snd_usb_endpoint *ep) |
| { |
| return ep->sync_master && |
| ep->sync_master->type == SND_USB_ENDPOINT_TYPE_DATA && |
| ep->type == SND_USB_ENDPOINT_TYPE_DATA && |
| usb_pipeout(ep->pipe); |
| } |
| |
| /* |
| * For streaming based on information derived from sync endpoints, |
| * prepare_outbound_urb_sizes() will call next_packet_size() to |
| * determine the number of samples to be sent in the next packet. |
| * |
| * For implicit feedback, next_packet_size() is unused. |
| */ |
| int snd_usb_endpoint_next_packet_size(struct snd_usb_endpoint *ep) |
| { |
| unsigned long flags; |
| int ret; |
| |
| if (ep->fill_max) |
| return ep->maxframesize; |
| |
| spin_lock_irqsave(&ep->lock, flags); |
| ep->phase = (ep->phase & 0xffff) |
| + (ep->freqm << ep->datainterval); |
| ret = min(ep->phase >> 16, ep->maxframesize); |
| spin_unlock_irqrestore(&ep->lock, flags); |
| |
| return ret; |
| } |
| |
| static void retire_outbound_urb(struct snd_usb_endpoint *ep, |
| struct snd_urb_ctx *urb_ctx) |
| { |
| if (ep->retire_data_urb) |
| ep->retire_data_urb(ep->data_subs, urb_ctx->urb); |
| } |
| |
| static void retire_inbound_urb(struct snd_usb_endpoint *ep, |
| struct snd_urb_ctx *urb_ctx) |
| { |
| struct urb *urb = urb_ctx->urb; |
| |
| if (unlikely(ep->skip_packets > 0)) { |
| ep->skip_packets--; |
| return; |
| } |
| |
| if (ep->sync_slave) |
| snd_usb_handle_sync_urb(ep->sync_slave, ep, urb); |
| |
| if (ep->retire_data_urb) |
| ep->retire_data_urb(ep->data_subs, urb); |
| } |
| |
| /* |
| * Prepare a PLAYBACK urb for submission to the bus. |
| */ |
| static void prepare_outbound_urb(struct snd_usb_endpoint *ep, |
| struct snd_urb_ctx *ctx) |
| { |
| int i; |
| struct urb *urb = ctx->urb; |
| unsigned char *cp = urb->transfer_buffer; |
| |
| urb->dev = ep->chip->dev; /* we need to set this at each time */ |
| |
| switch (ep->type) { |
| case SND_USB_ENDPOINT_TYPE_DATA: |
| if (ep->prepare_data_urb) { |
| ep->prepare_data_urb(ep->data_subs, urb); |
| } else { |
| /* no data provider, so send silence */ |
| unsigned int offs = 0; |
| for (i = 0; i < ctx->packets; ++i) { |
| int counts; |
| |
| if (ctx->packet_size[i]) |
| counts = ctx->packet_size[i]; |
| else |
| counts = snd_usb_endpoint_next_packet_size(ep); |
| |
| urb->iso_frame_desc[i].offset = offs * ep->stride; |
| urb->iso_frame_desc[i].length = counts * ep->stride; |
| offs += counts; |
| } |
| |
| urb->number_of_packets = ctx->packets; |
| urb->transfer_buffer_length = offs * ep->stride; |
| memset(urb->transfer_buffer, ep->silence_value, |
| offs * ep->stride); |
| } |
| break; |
| |
| case SND_USB_ENDPOINT_TYPE_SYNC: |
| if (snd_usb_get_speed(ep->chip->dev) >= USB_SPEED_HIGH) { |
| /* |
| * fill the length and offset of each urb descriptor. |
| * the fixed 12.13 frequency is passed as 16.16 through the pipe. |
| */ |
| urb->iso_frame_desc[0].length = 4; |
| urb->iso_frame_desc[0].offset = 0; |
| cp[0] = ep->freqn; |
| cp[1] = ep->freqn >> 8; |
| cp[2] = ep->freqn >> 16; |
| cp[3] = ep->freqn >> 24; |
| } else { |
| /* |
| * fill the length and offset of each urb descriptor. |
| * the fixed 10.14 frequency is passed through the pipe. |
| */ |
| urb->iso_frame_desc[0].length = 3; |
| urb->iso_frame_desc[0].offset = 0; |
| cp[0] = ep->freqn >> 2; |
| cp[1] = ep->freqn >> 10; |
| cp[2] = ep->freqn >> 18; |
| } |
| |
| break; |
| } |
| } |
| |
| /* |
| * Prepare a CAPTURE or SYNC urb for submission to the bus. |
| */ |
| static inline void prepare_inbound_urb(struct snd_usb_endpoint *ep, |
| struct snd_urb_ctx *urb_ctx) |
| { |
| int i, offs; |
| struct urb *urb = urb_ctx->urb; |
| |
| urb->dev = ep->chip->dev; /* we need to set this at each time */ |
| |
| switch (ep->type) { |
| case SND_USB_ENDPOINT_TYPE_DATA: |
| offs = 0; |
| for (i = 0; i < urb_ctx->packets; i++) { |
| urb->iso_frame_desc[i].offset = offs; |
| urb->iso_frame_desc[i].length = ep->curpacksize; |
| offs += ep->curpacksize; |
| } |
| |
| urb->transfer_buffer_length = offs; |
| urb->number_of_packets = urb_ctx->packets; |
| break; |
| |
| case SND_USB_ENDPOINT_TYPE_SYNC: |
| urb->iso_frame_desc[0].length = min(4u, ep->syncmaxsize); |
| urb->iso_frame_desc[0].offset = 0; |
| break; |
| } |
| } |
| |
| /* |
| * Send output urbs that have been prepared previously. URBs are dequeued |
| * from ep->ready_playback_urbs and in case there there aren't any available |
| * or there are no packets that have been prepared, this function does |
| * nothing. |
| * |
| * The reason why the functionality of sending and preparing URBs is separated |
| * is that host controllers don't guarantee the order in which they return |
| * inbound and outbound packets to their submitters. |
| * |
| * This function is only used for implicit feedback endpoints. For endpoints |
| * driven by dedicated sync endpoints, URBs are immediately re-submitted |
| * from their completion handler. |
| */ |
| static void queue_pending_output_urbs(struct snd_usb_endpoint *ep) |
| { |
| while (test_bit(EP_FLAG_RUNNING, &ep->flags)) { |
| |
| unsigned long flags; |
| struct snd_usb_packet_info *uninitialized_var(packet); |
| struct snd_urb_ctx *ctx = NULL; |
| struct urb *urb; |
| int err, i; |
| |
| spin_lock_irqsave(&ep->lock, flags); |
| if (ep->next_packet_read_pos != ep->next_packet_write_pos) { |
| packet = ep->next_packet + ep->next_packet_read_pos; |
| ep->next_packet_read_pos++; |
| ep->next_packet_read_pos %= MAX_URBS; |
| |
| /* take URB out of FIFO */ |
| if (!list_empty(&ep->ready_playback_urbs)) |
| ctx = list_first_entry(&ep->ready_playback_urbs, |
| struct snd_urb_ctx, ready_list); |
| } |
| spin_unlock_irqrestore(&ep->lock, flags); |
| |
| if (ctx == NULL) |
| return; |
| |
| list_del_init(&ctx->ready_list); |
| urb = ctx->urb; |
| |
| /* copy over the length information */ |
| for (i = 0; i < packet->packets; i++) |
| ctx->packet_size[i] = packet->packet_size[i]; |
| |
| /* call the data handler to fill in playback data */ |
| prepare_outbound_urb(ep, ctx); |
| |
| err = usb_submit_urb(ctx->urb, GFP_ATOMIC); |
| if (err < 0) |
| usb_audio_err(ep->chip, |
| "Unable to submit urb #%d: %d (urb %p)\n", |
| ctx->index, err, ctx->urb); |
| else |
| set_bit(ctx->index, &ep->active_mask); |
| } |
| } |
| |
| /* |
| * complete callback for urbs |
| */ |
| static void snd_complete_urb(struct urb *urb) |
| { |
| struct snd_urb_ctx *ctx = urb->context; |
| struct snd_usb_endpoint *ep = ctx->ep; |
| struct snd_pcm_substream *substream; |
| unsigned long flags; |
| int err; |
| |
| if (unlikely(urb->status == -ENOENT || /* unlinked */ |
| urb->status == -ENODEV || /* device removed */ |
| urb->status == -ECONNRESET || /* unlinked */ |
| urb->status == -ESHUTDOWN)) /* device disabled */ |
| goto exit_clear; |
| /* device disconnected */ |
| if (unlikely(atomic_read(&ep->chip->shutdown))) |
| goto exit_clear; |
| |
| if (usb_pipeout(ep->pipe)) { |
| retire_outbound_urb(ep, ctx); |
| /* can be stopped during retire callback */ |
| if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags))) |
| goto exit_clear; |
| |
| if (snd_usb_endpoint_implicit_feedback_sink(ep)) { |
| spin_lock_irqsave(&ep->lock, flags); |
| list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs); |
| spin_unlock_irqrestore(&ep->lock, flags); |
| queue_pending_output_urbs(ep); |
| |
| goto exit_clear; |
| } |
| |
| prepare_outbound_urb(ep, ctx); |
| } else { |
| retire_inbound_urb(ep, ctx); |
| /* can be stopped during retire callback */ |
| if (unlikely(!test_bit(EP_FLAG_RUNNING, &ep->flags))) |
| goto exit_clear; |
| |
| prepare_inbound_urb(ep, ctx); |
| } |
| |
| err = usb_submit_urb(urb, GFP_ATOMIC); |
| if (err == 0) |
| return; |
| |
| usb_audio_err(ep->chip, "cannot submit urb (err = %d)\n", err); |
| if (ep->data_subs && ep->data_subs->pcm_substream) { |
| substream = ep->data_subs->pcm_substream; |
| snd_pcm_stop_xrun(substream); |
| } |
| |
| exit_clear: |
| clear_bit(ctx->index, &ep->active_mask); |
| } |
| |
| /** |
| * snd_usb_add_endpoint: Add an endpoint to an USB audio chip |
| * |
| * @chip: The chip |
| * @alts: The USB host interface |
| * @ep_num: The number of the endpoint to use |
| * @direction: SNDRV_PCM_STREAM_PLAYBACK or SNDRV_PCM_STREAM_CAPTURE |
| * @type: SND_USB_ENDPOINT_TYPE_DATA or SND_USB_ENDPOINT_TYPE_SYNC |
| * |
| * If the requested endpoint has not been added to the given chip before, |
| * a new instance is created. Otherwise, a pointer to the previoulsy |
| * created instance is returned. In case of any error, NULL is returned. |
| * |
| * New endpoints will be added to chip->ep_list and must be freed by |
| * calling snd_usb_endpoint_free(). |
| * |
| * For SND_USB_ENDPOINT_TYPE_SYNC, the caller needs to guarantee that |
| * bNumEndpoints > 1 beforehand. |
| */ |
| struct snd_usb_endpoint *snd_usb_add_endpoint(struct snd_usb_audio *chip, |
| struct usb_host_interface *alts, |
| int ep_num, int direction, int type) |
| { |
| struct snd_usb_endpoint *ep; |
| int is_playback = direction == SNDRV_PCM_STREAM_PLAYBACK; |
| |
| if (WARN_ON(!alts)) |
| return NULL; |
| |
| mutex_lock(&chip->mutex); |
| |
| list_for_each_entry(ep, &chip->ep_list, list) { |
| if (ep->ep_num == ep_num && |
| ep->iface == alts->desc.bInterfaceNumber && |
| ep->altsetting == alts->desc.bAlternateSetting) { |
| usb_audio_dbg(ep->chip, |
| "Re-using EP %x in iface %d,%d @%p\n", |
| ep_num, ep->iface, ep->altsetting, ep); |
| goto __exit_unlock; |
| } |
| } |
| |
| usb_audio_dbg(chip, "Creating new %s %s endpoint #%x\n", |
| is_playback ? "playback" : "capture", |
| type == SND_USB_ENDPOINT_TYPE_DATA ? "data" : "sync", |
| ep_num); |
| |
| ep = kzalloc(sizeof(*ep), GFP_KERNEL); |
| if (!ep) |
| goto __exit_unlock; |
| |
| ep->chip = chip; |
| spin_lock_init(&ep->lock); |
| ep->type = type; |
| ep->ep_num = ep_num; |
| ep->iface = alts->desc.bInterfaceNumber; |
| ep->altsetting = alts->desc.bAlternateSetting; |
| INIT_LIST_HEAD(&ep->ready_playback_urbs); |
| ep_num &= USB_ENDPOINT_NUMBER_MASK; |
| |
| if (is_playback) |
| ep->pipe = usb_sndisocpipe(chip->dev, ep_num); |
| else |
| ep->pipe = usb_rcvisocpipe(chip->dev, ep_num); |
| |
| if (type == SND_USB_ENDPOINT_TYPE_SYNC) { |
| if (get_endpoint(alts, 1)->bLength >= USB_DT_ENDPOINT_AUDIO_SIZE && |
| get_endpoint(alts, 1)->bRefresh >= 1 && |
| get_endpoint(alts, 1)->bRefresh <= 9) |
| ep->syncinterval = get_endpoint(alts, 1)->bRefresh; |
| else if (snd_usb_get_speed(chip->dev) == USB_SPEED_FULL) |
| ep->syncinterval = 1; |
| else if (get_endpoint(alts, 1)->bInterval >= 1 && |
| get_endpoint(alts, 1)->bInterval <= 16) |
| ep->syncinterval = get_endpoint(alts, 1)->bInterval - 1; |
| else |
| ep->syncinterval = 3; |
| |
| ep->syncmaxsize = le16_to_cpu(get_endpoint(alts, 1)->wMaxPacketSize); |
| |
| if (chip->usb_id == USB_ID(0x0644, 0x8038) /* TEAC UD-H01 */ && |
| ep->syncmaxsize == 4) |
| ep->udh01_fb_quirk = 1; |
| } |
| |
| list_add_tail(&ep->list, &chip->ep_list); |
| |
| __exit_unlock: |
| mutex_unlock(&chip->mutex); |
| |
| return ep; |
| } |
| |
| /* |
| * wait until all urbs are processed. |
| */ |
| static int wait_clear_urbs(struct snd_usb_endpoint *ep) |
| { |
| unsigned long end_time = jiffies + msecs_to_jiffies(1000); |
| int alive; |
| |
| do { |
| alive = bitmap_weight(&ep->active_mask, ep->nurbs); |
| if (!alive) |
| break; |
| |
| schedule_timeout_uninterruptible(1); |
| } while (time_before(jiffies, end_time)); |
| |
| if (alive) |
| usb_audio_err(ep->chip, |
| "timeout: still %d active urbs on EP #%x\n", |
| alive, ep->ep_num); |
| clear_bit(EP_FLAG_STOPPING, &ep->flags); |
| |
| return 0; |
| } |
| |
| /* sync the pending stop operation; |
| * this function itself doesn't trigger the stop operation |
| */ |
| void snd_usb_endpoint_sync_pending_stop(struct snd_usb_endpoint *ep) |
| { |
| if (ep && test_bit(EP_FLAG_STOPPING, &ep->flags)) |
| wait_clear_urbs(ep); |
| } |
| |
| /* |
| * unlink active urbs. |
| */ |
| static int deactivate_urbs(struct snd_usb_endpoint *ep, bool force) |
| { |
| unsigned int i; |
| |
| if (!force && atomic_read(&ep->chip->shutdown)) /* to be sure... */ |
| return -EBADFD; |
| |
| clear_bit(EP_FLAG_RUNNING, &ep->flags); |
| |
| INIT_LIST_HEAD(&ep->ready_playback_urbs); |
| ep->next_packet_read_pos = 0; |
| ep->next_packet_write_pos = 0; |
| |
| for (i = 0; i < ep->nurbs; i++) { |
| if (test_bit(i, &ep->active_mask)) { |
| if (!test_and_set_bit(i, &ep->unlink_mask)) { |
| struct urb *u = ep->urb[i].urb; |
| usb_unlink_urb(u); |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * release an endpoint's urbs |
| */ |
| static void release_urbs(struct snd_usb_endpoint *ep, int force) |
| { |
| int i; |
| |
| /* route incoming urbs to nirvana */ |
| ep->retire_data_urb = NULL; |
| ep->prepare_data_urb = NULL; |
| |
| /* stop urbs */ |
| deactivate_urbs(ep, force); |
| wait_clear_urbs(ep); |
| |
| for (i = 0; i < ep->nurbs; i++) |
| release_urb_ctx(&ep->urb[i]); |
| |
| if (ep->syncbuf) |
| usb_free_coherent(ep->chip->dev, SYNC_URBS * 4, |
| ep->syncbuf, ep->sync_dma); |
| |
| ep->syncbuf = NULL; |
| ep->nurbs = 0; |
| } |
| |
| /* |
| * configure a data endpoint |
| */ |
| static int data_ep_set_params(struct snd_usb_endpoint *ep, |
| snd_pcm_format_t pcm_format, |
| unsigned int channels, |
| unsigned int period_bytes, |
| unsigned int frames_per_period, |
| unsigned int periods_per_buffer, |
| struct audioformat *fmt, |
| struct snd_usb_endpoint *sync_ep) |
| { |
| unsigned int maxsize, minsize, packs_per_ms, max_packs_per_urb; |
| unsigned int max_packs_per_period, urbs_per_period, urb_packs; |
| unsigned int max_urbs, i; |
| int frame_bits = snd_pcm_format_physical_width(pcm_format) * channels; |
| |
| if (pcm_format == SNDRV_PCM_FORMAT_DSD_U16_LE && fmt->dsd_dop) { |
| /* |
| * When operating in DSD DOP mode, the size of a sample frame |
| * in hardware differs from the actual physical format width |
| * because we need to make room for the DOP markers. |
| */ |
| frame_bits += channels << 3; |
| } |
| |
| ep->datainterval = fmt->datainterval; |
| ep->stride = frame_bits >> 3; |
| ep->silence_value = pcm_format == SNDRV_PCM_FORMAT_U8 ? 0x80 : 0; |
| |
| /* assume max. frequency is 25% higher than nominal */ |
| ep->freqmax = ep->freqn + (ep->freqn >> 2); |
| maxsize = ((ep->freqmax + 0xffff) * (frame_bits >> 3)) |
| >> (16 - ep->datainterval); |
| /* but wMaxPacketSize might reduce this */ |
| if (ep->maxpacksize && ep->maxpacksize < maxsize) { |
| /* whatever fits into a max. size packet */ |
| maxsize = ep->maxpacksize; |
| ep->freqmax = (maxsize / (frame_bits >> 3)) |
| << (16 - ep->datainterval); |
| } |
| |
| if (ep->fill_max) |
| ep->curpacksize = ep->maxpacksize; |
| else |
| ep->curpacksize = maxsize; |
| |
| if (snd_usb_get_speed(ep->chip->dev) != USB_SPEED_FULL) { |
| packs_per_ms = 8 >> ep->datainterval; |
| max_packs_per_urb = MAX_PACKS_HS; |
| } else { |
| packs_per_ms = 1; |
| max_packs_per_urb = MAX_PACKS; |
| } |
| if (sync_ep && !snd_usb_endpoint_implicit_feedback_sink(ep)) |
| max_packs_per_urb = min(max_packs_per_urb, |
| 1U << sync_ep->syncinterval); |
| max_packs_per_urb = max(1u, max_packs_per_urb >> ep->datainterval); |
| |
| /* |
| * Capture endpoints need to use small URBs because there's no way |
| * to tell in advance where the next period will end, and we don't |
| * want the next URB to complete much after the period ends. |
| * |
| * Playback endpoints with implicit sync much use the same parameters |
| * as their corresponding capture endpoint. |
| */ |
| if (usb_pipein(ep->pipe) || |
| snd_usb_endpoint_implicit_feedback_sink(ep)) { |
| |
| urb_packs = packs_per_ms; |
| /* |
| * Wireless devices can poll at a max rate of once per 4ms. |
| * For dataintervals less than 5, increase the packet count to |
| * allow the host controller to use bursting to fill in the |
| * gaps. |
| */ |
| if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_WIRELESS) { |
| int interval = ep->datainterval; |
| while (interval < 5) { |
| urb_packs <<= 1; |
| ++interval; |
| } |
| } |
| /* make capture URBs <= 1 ms and smaller than a period */ |
| urb_packs = min(max_packs_per_urb, urb_packs); |
| while (urb_packs > 1 && urb_packs * maxsize >= period_bytes) |
| urb_packs >>= 1; |
| ep->nurbs = MAX_URBS; |
| |
| /* |
| * Playback endpoints without implicit sync are adjusted so that |
| * a period fits as evenly as possible in the smallest number of |
| * URBs. The total number of URBs is adjusted to the size of the |
| * ALSA buffer, subject to the MAX_URBS and MAX_QUEUE limits. |
| */ |
| } else { |
| /* determine how small a packet can be */ |
| minsize = (ep->freqn >> (16 - ep->datainterval)) * |
| (frame_bits >> 3); |
| /* with sync from device, assume it can be 12% lower */ |
| if (sync_ep) |
| minsize -= minsize >> 3; |
| minsize = max(minsize, 1u); |
| |
| /* how many packets will contain an entire ALSA period? */ |
| max_packs_per_period = DIV_ROUND_UP(period_bytes, minsize); |
| |
| /* how many URBs will contain a period? */ |
| urbs_per_period = DIV_ROUND_UP(max_packs_per_period, |
| max_packs_per_urb); |
| /* how many packets are needed in each URB? */ |
| urb_packs = DIV_ROUND_UP(max_packs_per_period, urbs_per_period); |
| |
| /* limit the number of frames in a single URB */ |
| ep->max_urb_frames = DIV_ROUND_UP(frames_per_period, |
| urbs_per_period); |
| |
| /* try to use enough URBs to contain an entire ALSA buffer */ |
| max_urbs = min((unsigned) MAX_URBS, |
| MAX_QUEUE * packs_per_ms / urb_packs); |
| ep->nurbs = min(max_urbs, urbs_per_period * periods_per_buffer); |
| } |
| |
| /* allocate and initialize data urbs */ |
| for (i = 0; i < ep->nurbs; i++) { |
| struct snd_urb_ctx *u = &ep->urb[i]; |
| u->index = i; |
| u->ep = ep; |
| u->packets = urb_packs; |
| u->buffer_size = maxsize * u->packets; |
| |
| if (fmt->fmt_type == UAC_FORMAT_TYPE_II) |
| u->packets++; /* for transfer delimiter */ |
| u->urb = usb_alloc_urb(u->packets, GFP_KERNEL); |
| if (!u->urb) |
| goto out_of_memory; |
| |
| u->urb->transfer_buffer = |
| usb_alloc_coherent(ep->chip->dev, u->buffer_size, |
| GFP_KERNEL, &u->urb->transfer_dma); |
| if (!u->urb->transfer_buffer) |
| goto out_of_memory; |
| u->urb->pipe = ep->pipe; |
| u->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
| u->urb->interval = 1 << ep->datainterval; |
| u->urb->context = u; |
| u->urb->complete = snd_complete_urb; |
| INIT_LIST_HEAD(&u->ready_list); |
| } |
| |
| return 0; |
| |
| out_of_memory: |
| release_urbs(ep, 0); |
| return -ENOMEM; |
| } |
| |
| /* |
| * configure a sync endpoint |
| */ |
| static int sync_ep_set_params(struct snd_usb_endpoint *ep) |
| { |
| int i; |
| |
| ep->syncbuf = usb_alloc_coherent(ep->chip->dev, SYNC_URBS * 4, |
| GFP_KERNEL, &ep->sync_dma); |
| if (!ep->syncbuf) |
| return -ENOMEM; |
| |
| for (i = 0; i < SYNC_URBS; i++) { |
| struct snd_urb_ctx *u = &ep->urb[i]; |
| u->index = i; |
| u->ep = ep; |
| u->packets = 1; |
| u->urb = usb_alloc_urb(1, GFP_KERNEL); |
| if (!u->urb) |
| goto out_of_memory; |
| u->urb->transfer_buffer = ep->syncbuf + i * 4; |
| u->urb->transfer_dma = ep->sync_dma + i * 4; |
| u->urb->transfer_buffer_length = 4; |
| u->urb->pipe = ep->pipe; |
| u->urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP; |
| u->urb->number_of_packets = 1; |
| u->urb->interval = 1 << ep->syncinterval; |
| u->urb->context = u; |
| u->urb->complete = snd_complete_urb; |
| } |
| |
| ep->nurbs = SYNC_URBS; |
| |
| return 0; |
| |
| out_of_memory: |
| release_urbs(ep, 0); |
| return -ENOMEM; |
| } |
| |
| /** |
| * snd_usb_endpoint_set_params: configure an snd_usb_endpoint |
| * |
| * @ep: the snd_usb_endpoint to configure |
| * @pcm_format: the audio fomat. |
| * @channels: the number of audio channels. |
| * @period_bytes: the number of bytes in one alsa period. |
| * @period_frames: the number of frames in one alsa period. |
| * @buffer_periods: the number of periods in one alsa buffer. |
| * @rate: the frame rate. |
| * @fmt: the USB audio format information |
| * @sync_ep: the sync endpoint to use, if any |
| * |
| * Determine the number of URBs to be used on this endpoint. |
| * An endpoint must be configured before it can be started. |
| * An endpoint that is already running can not be reconfigured. |
| */ |
| int snd_usb_endpoint_set_params(struct snd_usb_endpoint *ep, |
| snd_pcm_format_t pcm_format, |
| unsigned int channels, |
| unsigned int period_bytes, |
| unsigned int period_frames, |
| unsigned int buffer_periods, |
| unsigned int rate, |
| struct audioformat *fmt, |
| struct snd_usb_endpoint *sync_ep) |
| { |
| int err; |
| |
| if (ep->use_count != 0) { |
| usb_audio_warn(ep->chip, |
| "Unable to change format on ep #%x: already in use\n", |
| ep->ep_num); |
| return -EBUSY; |
| } |
| |
| /* release old buffers, if any */ |
| release_urbs(ep, 0); |
| |
| ep->datainterval = fmt->datainterval; |
| ep->maxpacksize = fmt->maxpacksize; |
| ep->fill_max = !!(fmt->attributes & UAC_EP_CS_ATTR_FILL_MAX); |
| |
| if (snd_usb_get_speed(ep->chip->dev) == USB_SPEED_FULL) |
| ep->freqn = get_usb_full_speed_rate(rate); |
| else |
| ep->freqn = get_usb_high_speed_rate(rate); |
| |
| /* calculate the frequency in 16.16 format */ |
| ep->freqm = ep->freqn; |
| ep->freqshift = INT_MIN; |
| |
| ep->phase = 0; |
| |
| switch (ep->type) { |
| case SND_USB_ENDPOINT_TYPE_DATA: |
| err = data_ep_set_params(ep, pcm_format, channels, |
| period_bytes, period_frames, |
| buffer_periods, fmt, sync_ep); |
| break; |
| case SND_USB_ENDPOINT_TYPE_SYNC: |
| err = sync_ep_set_params(ep); |
| break; |
| default: |
| err = -EINVAL; |
| } |
| |
| usb_audio_dbg(ep->chip, |
| "Setting params for ep #%x (type %d, %d urbs), ret=%d\n", |
| ep->ep_num, ep->type, ep->nurbs, err); |
| |
| return err; |
| } |
| |
| /** |
| * snd_usb_endpoint_start: start an snd_usb_endpoint |
| * |
| * @ep: the endpoint to start |
| * @can_sleep: flag indicating whether the operation is executed in |
| * non-atomic context |
| * |
| * A call to this function will increment the use count of the endpoint. |
| * In case it is not already running, the URBs for this endpoint will be |
| * submitted. Otherwise, this function does nothing. |
| * |
| * Must be balanced to calls of snd_usb_endpoint_stop(). |
| * |
| * Returns an error if the URB submission failed, 0 in all other cases. |
| */ |
| int snd_usb_endpoint_start(struct snd_usb_endpoint *ep, bool can_sleep) |
| { |
| int err; |
| unsigned int i; |
| |
| if (atomic_read(&ep->chip->shutdown)) |
| return -EBADFD; |
| |
| /* already running? */ |
| if (++ep->use_count != 1) |
| return 0; |
| |
| /* just to be sure */ |
| deactivate_urbs(ep, false); |
| if (can_sleep) |
| wait_clear_urbs(ep); |
| |
| ep->active_mask = 0; |
| ep->unlink_mask = 0; |
| ep->phase = 0; |
| |
| snd_usb_endpoint_start_quirk(ep); |
| |
| /* |
| * If this endpoint has a data endpoint as implicit feedback source, |
| * don't start the urbs here. Instead, mark them all as available, |
| * wait for the record urbs to return and queue the playback urbs |
| * from that context. |
| */ |
| |
| set_bit(EP_FLAG_RUNNING, &ep->flags); |
| |
| if (snd_usb_endpoint_implicit_feedback_sink(ep)) { |
| for (i = 0; i < ep->nurbs; i++) { |
| struct snd_urb_ctx *ctx = ep->urb + i; |
| list_add_tail(&ctx->ready_list, &ep->ready_playback_urbs); |
| } |
| |
| return 0; |
| } |
| |
| for (i = 0; i < ep->nurbs; i++) { |
| struct urb *urb = ep->urb[i].urb; |
| |
| if (snd_BUG_ON(!urb)) |
| goto __error; |
| |
| if (usb_pipeout(ep->pipe)) { |
| prepare_outbound_urb(ep, urb->context); |
| } else { |
| prepare_inbound_urb(ep, urb->context); |
| } |
| |
| err = usb_submit_urb(urb, GFP_ATOMIC); |
| if (err < 0) { |
| usb_audio_err(ep->chip, |
| "cannot submit urb %d, error %d: %s\n", |
| i, err, usb_error_string(err)); |
| goto __error; |
| } |
| set_bit(i, &ep->active_mask); |
| } |
| |
| return 0; |
| |
| __error: |
| clear_bit(EP_FLAG_RUNNING, &ep->flags); |
| ep->use_count--; |
| deactivate_urbs(ep, false); |
| return -EPIPE; |
| } |
| |
| /** |
| * snd_usb_endpoint_stop: stop an snd_usb_endpoint |
| * |
| * @ep: the endpoint to stop (may be NULL) |
| * |
| * A call to this function will decrement the use count of the endpoint. |
| * In case the last user has requested the endpoint stop, the URBs will |
| * actually be deactivated. |
| * |
| * Must be balanced to calls of snd_usb_endpoint_start(). |
| * |
| * The caller needs to synchronize the pending stop operation via |
| * snd_usb_endpoint_sync_pending_stop(). |
| */ |
| void snd_usb_endpoint_stop(struct snd_usb_endpoint *ep) |
| { |
| if (!ep) |
| return; |
| |
| if (snd_BUG_ON(ep->use_count == 0)) |
| return; |
| |
| if (--ep->use_count == 0) { |
| deactivate_urbs(ep, false); |
| ep->data_subs = NULL; |
| ep->sync_slave = NULL; |
| ep->retire_data_urb = NULL; |
| ep->prepare_data_urb = NULL; |
| set_bit(EP_FLAG_STOPPING, &ep->flags); |
| } |
| } |
| |
| /** |
| * snd_usb_endpoint_deactivate: deactivate an snd_usb_endpoint |
| * |
| * @ep: the endpoint to deactivate |
| * |
| * If the endpoint is not currently in use, this functions will |
| * deactivate its associated URBs. |
| * |
| * In case of any active users, this functions does nothing. |
| */ |
| void snd_usb_endpoint_deactivate(struct snd_usb_endpoint *ep) |
| { |
| if (!ep) |
| return; |
| |
| if (ep->use_count != 0) |
| return; |
| |
| deactivate_urbs(ep, true); |
| wait_clear_urbs(ep); |
| } |
| |
| /** |
| * snd_usb_endpoint_release: Tear down an snd_usb_endpoint |
| * |
| * @ep: the endpoint to release |
| * |
| * This function does not care for the endpoint's use count but will tear |
| * down all the streaming URBs immediately. |
| */ |
| void snd_usb_endpoint_release(struct snd_usb_endpoint *ep) |
| { |
| release_urbs(ep, 1); |
| } |
| |
| /** |
| * snd_usb_endpoint_free: Free the resources of an snd_usb_endpoint |
| * |
| * @ep: the endpoint to free |
| * |
| * This free all resources of the given ep. |
| */ |
| void snd_usb_endpoint_free(struct snd_usb_endpoint *ep) |
| { |
| kfree(ep); |
| } |
| |
| /** |
| * snd_usb_handle_sync_urb: parse an USB sync packet |
| * |
| * @ep: the endpoint to handle the packet |
| * @sender: the sending endpoint |
| * @urb: the received packet |
| * |
| * This function is called from the context of an endpoint that received |
| * the packet and is used to let another endpoint object handle the payload. |
| */ |
| void snd_usb_handle_sync_urb(struct snd_usb_endpoint *ep, |
| struct snd_usb_endpoint *sender, |
| const struct urb *urb) |
| { |
| int shift; |
| unsigned int f; |
| unsigned long flags; |
| |
| snd_BUG_ON(ep == sender); |
| |
| /* |
| * In case the endpoint is operating in implicit feedback mode, prepare |
| * a new outbound URB that has the same layout as the received packet |
| * and add it to the list of pending urbs. queue_pending_output_urbs() |
| * will take care of them later. |
| */ |
| if (snd_usb_endpoint_implicit_feedback_sink(ep) && |
| ep->use_count != 0) { |
| |
| /* implicit feedback case */ |
| int i, bytes = 0; |
| struct snd_urb_ctx *in_ctx; |
| struct snd_usb_packet_info *out_packet; |
| |
| in_ctx = urb->context; |
| |
| /* Count overall packet size */ |
| for (i = 0; i < in_ctx->packets; i++) |
| if (urb->iso_frame_desc[i].status == 0) |
| bytes += urb->iso_frame_desc[i].actual_length; |
| |
| /* |
| * skip empty packets. At least M-Audio's Fast Track Ultra stops |
| * streaming once it received a 0-byte OUT URB |
| */ |
| if (bytes == 0) |
| return; |
| |
| spin_lock_irqsave(&ep->lock, flags); |
| out_packet = ep->next_packet + ep->next_packet_write_pos; |
| |
| /* |
| * Iterate through the inbound packet and prepare the lengths |
| * for the output packet. The OUT packet we are about to send |
| * will have the same amount of payload bytes per stride as the |
| * IN packet we just received. Since the actual size is scaled |
| * by the stride, use the sender stride to calculate the length |
| * in case the number of channels differ between the implicitly |
| * fed-back endpoint and the synchronizing endpoint. |
| */ |
| |
| out_packet->packets = in_ctx->packets; |
| for (i = 0; i < in_ctx->packets; i++) { |
| if (urb->iso_frame_desc[i].status == 0) |
| out_packet->packet_size[i] = |
| urb->iso_frame_desc[i].actual_length / sender->stride; |
| else |
| out_packet->packet_size[i] = 0; |
| } |
| |
| ep->next_packet_write_pos++; |
| ep->next_packet_write_pos %= MAX_URBS; |
| spin_unlock_irqrestore(&ep->lock, flags); |
| queue_pending_output_urbs(ep); |
| |
| return; |
| } |
| |
| /* |
| * process after playback sync complete |
| * |
| * Full speed devices report feedback values in 10.14 format as samples |
| * per frame, high speed devices in 16.16 format as samples per |
| * microframe. |
| * |
| * Because the Audio Class 1 spec was written before USB 2.0, many high |
| * speed devices use a wrong interpretation, some others use an |
| * entirely different format. |
| * |
| * Therefore, we cannot predict what format any particular device uses |
| * and must detect it automatically. |
| */ |
| |
| if (urb->iso_frame_desc[0].status != 0 || |
| urb->iso_frame_desc[0].actual_length < 3) |
| return; |
| |
| f = le32_to_cpup(urb->transfer_buffer); |
| if (urb->iso_frame_desc[0].actual_length == 3) |
| f &= 0x00ffffff; |
| else |
| f &= 0x0fffffff; |
| |
| if (f == 0) |
| return; |
| |
| if (unlikely(sender->udh01_fb_quirk)) { |
| /* |
| * The TEAC UD-H01 firmware sometimes changes the feedback value |
| * by +/- 0x1.0000. |
| */ |
| if (f < ep->freqn - 0x8000) |
| f += 0x10000; |
| else if (f > ep->freqn + 0x8000) |
| f -= 0x10000; |
| } else if (unlikely(ep->freqshift == INT_MIN)) { |
| /* |
| * The first time we see a feedback value, determine its format |
| * by shifting it left or right until it matches the nominal |
| * frequency value. This assumes that the feedback does not |
| * differ from the nominal value more than +50% or -25%. |
| */ |
| shift = 0; |
| while (f < ep->freqn - ep->freqn / 4) { |
| f <<= 1; |
| shift++; |
| } |
| while (f > ep->freqn + ep->freqn / 2) { |
| f >>= 1; |
| shift--; |
| } |
| ep->freqshift = shift; |
| } else if (ep->freqshift >= 0) |
| f <<= ep->freqshift; |
| else |
| f >>= -ep->freqshift; |
| |
| if (likely(f >= ep->freqn - ep->freqn / 8 && f <= ep->freqmax)) { |
| /* |
| * If the frequency looks valid, set it. |
| * This value is referred to in prepare_playback_urb(). |
| */ |
| spin_lock_irqsave(&ep->lock, flags); |
| ep->freqm = f; |
| spin_unlock_irqrestore(&ep->lock, flags); |
| } else { |
| /* |
| * Out of range; maybe the shift value is wrong. |
| * Reset it so that we autodetect again the next time. |
| */ |
| ep->freqshift = INT_MIN; |
| } |
| } |
| |