// SPDX-License-Identifier: GPL-2.0 // (c) 2025 serifpersia #include #include #include #include #include #include #include #include #include MODULE_AUTHOR("serifpersia"); MODULE_DESCRIPTION("ALSA Driver for TASCAM US-144MKII"); MODULE_LICENSE("GPL"); MODULE_VERSION("1.4"); #define DRIVER_NAME "us144mkii" /* --- LATENCY CONTROL PANEL --- */ /* * Set the desired latency profile by its index. * This setting is static and applies to all sample rates. * * Cheatsheet: * Index | Profile | Feedback Interval * ------|---------|-------------------- * 0 | Lowest | ~5ms * 1 | Low | ~1ms * 2 | Normal | ~2ms * 3 | High | ~5ms * 4 | Highest | ~5ms */ #define LATENCY_PROFILE_INDEX 2 /* Default to Normal */ /* --- Internal Latency Configuration - Do not edit --- */ static const unsigned int latency_profile_packets[] = { 5, 1, 2, 5, 5 }; #if LATENCY_PROFILE_INDEX < 0 || LATENCY_PROFILE_INDEX >= 5 #error "Invalid LATENCY_PROFILE_INDEX. Please choose a value from 0 to 4." #endif #define CURRENT_LATENCY_PACKETS latency_profile_packets[LATENCY_PROFILE_INDEX] #define TASCAM_VID 0x0644 #define TASCAM_PID 0x8020 #define EP_AUDIO_OUT 0x02 #define EP_PLAYBACK_FEEDBACK 0x81 #define EP_CAPTURE_DATA 0x86 #define RT_H2D_CLASS_EP 0x22 #define RT_H2D_VENDOR_DEV 0x40 #define RT_D2H_VENDOR_DEV 0xc0 #define UAC_SET_CUR 0x01 #define UAC_SAMPLING_FREQ_CONTROL 0x0100 #define VENDOR_REQ_REGISTER_WRITE 65 #define VENDOR_REQ_MODE_CONTROL 73 #define NUM_PLAYBACK_URBS 8 #define NUM_FEEDBACK_URBS 4 #define BYTES_PER_SAMPLE 3 #define DEVICE_CHANNELS 4 #define DEVICE_BYTES_PER_FRAME (DEVICE_CHANNELS * BYTES_PER_SAMPLE) #define MAX_SUPPORTED_RATE 96000 #define USB_CTRL_TIMEOUT_MS 1000 #define PLAYBACK_URB_ISO_PACKETS 40 #define FEEDBACK_PACKET_SIZE 3 #define FEEDBACK_ACCUMULATOR_SIZE 128 static const unsigned int patterns_48khz[5][8] = { {5, 6, 6, 6, 5, 6, 6, 6}, {5, 6, 6, 6, 6, 6, 6, 6}, {6, 6, 6, 6, 6, 6, 6, 6}, {7, 6, 6, 6, 6, 6, 6, 6}, {7, 6, 6, 6, 7, 6, 6, 6} }; static const unsigned int patterns_96khz[5][8] = { {11, 12, 12, 12, 11, 12, 12, 12}, {11, 12, 12, 12, 12, 12, 12, 12}, {12, 12, 12, 12, 12, 12, 12, 12}, {13, 12, 12, 12, 12, 12, 12, 12}, {13, 12, 12, 12, 13, 12, 12, 12} }; static const unsigned int patterns_88khz[5][8] = { {10, 11, 11, 11, 10, 11, 11, 11}, {10, 11, 11, 11, 11, 11, 11, 11}, {11, 11, 11, 11, 11, 11, 11, 11}, {12, 11, 11, 11, 11, 11, 11, 11}, {12, 11, 11, 11, 12, 11, 11, 11} }; static const unsigned int patterns_44khz[5][8] = { {5, 5, 5, 6, 5, 5, 5, 6}, {5, 5, 6, 5, 5, 6, 5, 6}, {5, 6, 5, 6, 5, 6, 5, 6}, {6, 5, 6, 6, 5, 6, 5, 6}, {6, 6, 6, 5, 6, 6, 6, 5} }; static struct usb_driver tascam_alsa_driver; struct tascam_card { struct usb_device *dev; struct usb_interface *iface0; struct usb_interface *iface1; struct snd_card *card; struct snd_pcm *pcm; struct snd_pcm_substream *playback_substream; struct urb *playback_urbs[NUM_PLAYBACK_URBS]; size_t playback_urb_alloc_size; struct urb *feedback_urbs[NUM_FEEDBACK_URBS]; size_t feedback_urb_alloc_size; spinlock_t lock; atomic_t playback_active; atomic_t feedback_active; unsigned int feedback_accumulator_pattern[FEEDBACK_ACCUMULATOR_SIZE]; unsigned int feedback_pattern_out_idx; unsigned int feedback_pattern_in_idx; snd_pcm_uframes_t driver_playback_pos; snd_pcm_uframes_t playback_frames_consumed; const unsigned int (*feedback_patterns)[8]; unsigned int feedback_base_value; unsigned int feedback_max_value; unsigned int feedback_urb_skip_count; }; static int tascam_pcm_open(struct snd_pcm_substream *substream); static int tascam_pcm_close(struct snd_pcm_substream *substream); static int tascam_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params); static int tascam_pcm_hw_free(struct snd_pcm_substream *substream); static int tascam_pcm_prepare(struct snd_pcm_substream *substream); static int tascam_pcm_trigger(struct snd_pcm_substream *substream, int cmd); static snd_pcm_uframes_t tascam_pcm_pointer(struct snd_pcm_substream *substream); static void playback_urb_complete(struct urb *urb); static void feedback_urb_complete(struct urb *urb); static int us144mkii_configure_device_for_rate(struct tascam_card *tascam, int rate); // TODO: Fix DAW crashing when using this device static const struct snd_pcm_hardware tascam_pcm_hw = { .info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME), .formats = SNDRV_PCM_FMTBIT_S24_3LE, .rates = (SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000), .rate_min = 44100, .rate_max = 96000, .channels_min = 2, .channels_max = 2, .buffer_bytes_max = 1024 * 1024, .period_bytes_min = 64, .period_bytes_max = 64 * 1024, .periods_min = 2, .periods_max = 1024, }; static struct snd_pcm_ops tascam_playback_ops = { .open = tascam_pcm_open, .close = tascam_pcm_close, .ioctl = snd_pcm_lib_ioctl, .hw_params = tascam_pcm_hw_params, .hw_free = tascam_pcm_hw_free, .prepare = tascam_pcm_prepare, .trigger = tascam_pcm_trigger, .pointer = tascam_pcm_pointer, }; static int tascam_capture_open_stub(struct snd_pcm_substream *substream) { return -ENODEV; } static int tascam_capture_close_stub(struct snd_pcm_substream *substream) { return 0; } static struct snd_pcm_ops tascam_capture_ops = { .open = tascam_capture_open_stub, .close = tascam_capture_close_stub, }; static void tascam_card_private_free(struct snd_card *card) { struct tascam_card *tascam = card->private_data; if (tascam && tascam->dev) { usb_put_dev(tascam->dev); tascam->dev = NULL; } } static int us144mkii_configure_device_for_rate(struct tascam_card *tascam, int rate) { struct usb_device *dev = tascam->dev; u8 *rate_payload_buf; u16 rate_vendor_wValue; int err = 0; static const u8 payload_44100[] = {0x44, 0xac, 0x00}; static const u8 payload_48000[] = {0x80, 0xbb, 0x00}; static const u8 payload_88200[] = {0x88, 0x58, 0x01}; static const u8 payload_96000[] = {0x00, 0x77, 0x01}; const u8 *current_payload_src; rate_payload_buf = kmalloc(3, GFP_KERNEL); if (!rate_payload_buf) return -ENOMEM; switch (rate) { case 44100: current_payload_src = payload_44100; rate_vendor_wValue = 0x1000; break; case 48000: current_payload_src = payload_48000; rate_vendor_wValue = 0x1002; break; case 88200: current_payload_src = payload_88200; rate_vendor_wValue = 0x1008; break; case 96000: current_payload_src = payload_96000; rate_vendor_wValue = 0x100a; break; default: dev_err(&dev->dev, "Unsupported sample rate %d for configuration\n", rate); kfree(rate_payload_buf); return -EINVAL; } memcpy(rate_payload_buf, current_payload_src, 3); err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), VENDOR_REQ_MODE_CONTROL, RT_H2D_VENDOR_DEV, 0x0010, 0x0000, NULL, 0, USB_CTRL_TIMEOUT_MS); if (err < 0) { goto cleanup_buf; } err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR, RT_H2D_CLASS_EP, UAC_SAMPLING_FREQ_CONTROL, EP_CAPTURE_DATA, rate_payload_buf, 3, USB_CTRL_TIMEOUT_MS); if (err < 0) { goto cleanup_buf; } err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR, RT_H2D_CLASS_EP, UAC_SAMPLING_FREQ_CONTROL, EP_AUDIO_OUT, rate_payload_buf, 3, USB_CTRL_TIMEOUT_MS); if (err < 0) { goto cleanup_buf; } err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), VENDOR_REQ_REGISTER_WRITE, RT_H2D_VENDOR_DEV, 0x0d04, 0x0101, NULL, 0, USB_CTRL_TIMEOUT_MS); if (err < 0) { goto cleanup_buf; } err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), VENDOR_REQ_REGISTER_WRITE, RT_H2D_VENDOR_DEV, 0x0e00, 0x0101, NULL, 0, USB_CTRL_TIMEOUT_MS); if (err < 0) { goto cleanup_buf; } err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), VENDOR_REQ_REGISTER_WRITE, RT_H2D_VENDOR_DEV, 0x0f00, 0x0101, NULL, 0, USB_CTRL_TIMEOUT_MS); if (err < 0) { goto cleanup_buf; } err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), VENDOR_REQ_REGISTER_WRITE, RT_H2D_VENDOR_DEV, rate_vendor_wValue, 0x0101, NULL, 0, USB_CTRL_TIMEOUT_MS); if (err < 0) { goto cleanup_buf; } err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), VENDOR_REQ_REGISTER_WRITE, RT_H2D_VENDOR_DEV, 0x110b, 0x0101, NULL, 0, USB_CTRL_TIMEOUT_MS); if (err < 0) { goto cleanup_buf; } err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), VENDOR_REQ_MODE_CONTROL, RT_H2D_VENDOR_DEV, 0x0030, 0x0000, NULL, 0, USB_CTRL_TIMEOUT_MS); if (err < 0) { goto cleanup_buf; } cleanup_buf: kfree(rate_payload_buf); return err; } static int tascam_probe(struct usb_interface *intf, const struct usb_device_id *id) { struct usb_device *dev = interface_to_usbdev(intf); struct tascam_card *tascam; struct snd_card *card; struct snd_pcm *pcm; int err; u8 *handshake_buf; if (intf->cur_altsetting->desc.bInterfaceNumber != 0) return -ENODEV; err = snd_card_new(&intf->dev, -1, "US144MKII", THIS_MODULE, sizeof(struct tascam_card), &card); if (err < 0) { dev_err(&intf->dev, "Failed to create snd_card: %d\n", err); return err; } tascam = card->private_data; tascam->card = card; tascam->dev = usb_get_dev(dev); tascam->iface0 = intf; card->private_free = tascam_card_private_free; usb_set_intfdata(intf, tascam); spin_lock_init(&tascam->lock); atomic_set(&tascam->playback_active, 0); atomic_set(&tascam->feedback_active, 0); strscpy(card->driver, DRIVER_NAME, sizeof(card->driver)); strscpy(card->shortname, "TASCAM US-144MKII", sizeof(card->shortname)); snprintf(card->longname, sizeof(card->longname), "%s (VID:%04X PID:%04X) at %s IF%d", "TASCAM US-144MKII", le16_to_cpu(dev->descriptor.idVendor), le16_to_cpu(dev->descriptor.idProduct), dev->bus->bus_name, intf->cur_altsetting->desc.bInterfaceNumber); tascam->iface1 = usb_ifnum_to_if(dev, 1); if (!tascam->iface1) { dev_err(&intf->dev, "Interface 1 not found.\n"); err = -ENODEV; goto free_card_obj; } err = usb_driver_claim_interface(&tascam_alsa_driver, tascam->iface1, tascam); if (err < 0) { dev_err(&intf->dev, "Could not claim interface 1: %d\n", err); tascam->iface1 = NULL; goto free_card_obj; } err = usb_set_interface(dev, 0, 1); if (err < 0) { dev_err(&intf->dev, "Set Alt Setting on Intf 0 failed: %d\n", err); goto release_iface1_and_free_card; } err = usb_set_interface(dev, 1, 1); if (err < 0) { dev_err(&intf->dev, "Set Alt Setting on Intf 1 failed: %d\n", err); goto release_iface1_and_free_card; } handshake_buf = kmalloc(1, GFP_KERNEL); if (!handshake_buf) { err = -ENOMEM; goto release_iface1_and_free_card; } err = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), VENDOR_REQ_MODE_CONTROL, RT_D2H_VENDOR_DEV, 0x0000, 0x0000, handshake_buf, 1, USB_CTRL_TIMEOUT_MS); if (err < 0) { dev_warn(&intf->dev, "Handshake read failed: %d (continuing)\n", err); } else if (err == 1 && handshake_buf[0] == 0x12) { dev_info(&intf->dev, "Handshake successful (response 0x12).\n"); } else { dev_warn(&intf->dev, "Handshake: expected 0x12, got 0x%02x (len %d) (continuing)\n", handshake_buf[0], err); } kfree(handshake_buf); handshake_buf = NULL; err = us144mkii_configure_device_for_rate(tascam, 48000); if (err < 0) { dev_err(&intf->dev, "Initial device configuration for 48kHz failed: %d\n", err); goto release_iface1_and_free_card; } err = snd_pcm_new(card, "US144MKII PCM", 0, 1, 1, &pcm); if (err < 0) { dev_err(&intf->dev, "Failed to create snd_pcm: %d\n", err); goto release_iface1_and_free_card; } tascam->pcm = pcm; snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &tascam_playback_ops); snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &tascam_capture_ops); pcm->private_data = tascam; strscpy(pcm->name, "US-144MKII Audio", sizeof(pcm->name)); snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS, usb_ifnum_to_if(dev,0)->dev.parent, 64 * 1024, tascam_pcm_hw.buffer_bytes_max); err = snd_card_register(card); if (err < 0) { dev_err(&intf->dev, "Failed to register snd_card: %d\n", err); goto release_iface1_and_free_card; } dev_info(&intf->dev, "%s: TASCAM US-144MKII ALSA driver initialized.\n", card->longname); return 0; release_iface1_and_free_card: if (tascam->iface1) { usb_driver_release_interface(&tascam_alsa_driver, tascam->iface1); tascam->iface1 = NULL; } free_card_obj: snd_card_free(card); return err; } static void tascam_disconnect(struct usb_interface *intf) { struct tascam_card *tascam = usb_get_intfdata(intf); if (!tascam) return; if (intf == tascam->iface0) { atomic_set(&tascam->playback_active, 0); atomic_set(&tascam->feedback_active, 0); snd_card_disconnect(tascam->card); if (tascam->iface1) { usb_driver_release_interface(&tascam_alsa_driver, tascam->iface1); tascam->iface1 = NULL; } snd_card_free_when_closed(tascam->card); } } static void playback_urb_complete(struct urb *urb) { struct tascam_card *tascam = urb->context; struct snd_pcm_substream *substream; struct snd_pcm_runtime *runtime; unsigned long flags; int ret, i, f; char *urb_buf_ptr = urb->transfer_buffer; size_t alsa_frame_bytes; if (urb->status == -ENOENT || urb->status == -ECONNRESET || urb->status == -ESHUTDOWN) return; if (!tascam || !atomic_read(&tascam->playback_active)) return; substream = tascam->playback_substream; if (!substream) return; runtime = substream->runtime; if (!runtime) return; alsa_frame_bytes = runtime->frame_bits / 8; spin_lock_irqsave(&tascam->lock, flags); for (i = 0; i < PLAYBACK_URB_ISO_PACKETS; i++) { unsigned int frames_for_packet; size_t bytes_for_packet; frames_for_packet = tascam->feedback_accumulator_pattern[tascam->feedback_pattern_out_idx]; tascam->feedback_pattern_out_idx = (tascam->feedback_pattern_out_idx + 1) % FEEDBACK_ACCUMULATOR_SIZE; for (f = 0; f < frames_for_packet; f++) { size_t alsa_pos_bytes = frames_to_bytes(runtime, tascam->driver_playback_pos); char *alsa_frame_ptr = runtime->dma_area + alsa_pos_bytes; memcpy(urb_buf_ptr, alsa_frame_ptr, alsa_frame_bytes); memset(urb_buf_ptr + alsa_frame_bytes, 0, alsa_frame_bytes); urb_buf_ptr += DEVICE_BYTES_PER_FRAME; tascam->driver_playback_pos++; if (tascam->driver_playback_pos >= runtime->buffer_size) tascam->driver_playback_pos = 0; } bytes_for_packet = frames_for_packet * DEVICE_BYTES_PER_FRAME; urb->iso_frame_desc[i].offset = (urb_buf_ptr - (char *)urb->transfer_buffer) - bytes_for_packet; urb->iso_frame_desc[i].length = bytes_for_packet; } spin_unlock_irqrestore(&tascam->lock, flags); urb->transfer_buffer_length = urb_buf_ptr - (char *)urb->transfer_buffer; if (atomic_read(&tascam->playback_active)) { urb->dev = tascam->dev; ret = usb_submit_urb(urb, GFP_ATOMIC); if (ret < 0) dev_err_ratelimited(tascam->card->dev, "Failed to resubmit playback URB: %d\n", ret); } } static void feedback_urb_complete(struct urb *urb) { struct tascam_card *tascam = urb->context; struct snd_pcm_substream *substream; struct snd_pcm_runtime *runtime; unsigned long flags; int ret, i, p; unsigned int frames_consumed_in_urb = 0; if (urb->status == -ENOENT || urb->status == -ECONNRESET || urb->status == -ESHUTDOWN) return; if (!tascam || !atomic_read(&tascam->feedback_active)) return; substream = tascam->playback_substream; if (!substream) return; runtime = substream->runtime; if (!runtime) return; spin_lock_irqsave(&tascam->lock, flags); if (tascam->feedback_urb_skip_count > 0) { tascam->feedback_urb_skip_count--; spin_unlock_irqrestore(&tascam->lock, flags); goto resubmit; } spin_unlock_irqrestore(&tascam->lock, flags); if (urb->status != 0) goto resubmit; spin_lock_irqsave(&tascam->lock, flags); for (p = 0; p < urb->number_of_packets; p++) { u8 feedback_value; const unsigned int *pattern; int pattern_index; unsigned int frames_this_ms = 0; if (urb->iso_frame_desc[p].actual_length < 1) continue; feedback_value = *((u8 *)urb->transfer_buffer + urb->iso_frame_desc[p].offset); if (feedback_value >= tascam->feedback_base_value && feedback_value <= tascam->feedback_max_value) { pattern_index = feedback_value - tascam->feedback_base_value; pattern = tascam->feedback_patterns[pattern_index]; } else { pattern_index = 2; pattern = tascam->feedback_patterns[pattern_index]; } for (i = 0; i < 8; i++) { unsigned int in_idx = (tascam->feedback_pattern_in_idx + i) % FEEDBACK_ACCUMULATOR_SIZE; tascam->feedback_accumulator_pattern[in_idx] = pattern[i]; frames_this_ms += pattern[i]; } tascam->feedback_pattern_in_idx = (tascam->feedback_pattern_in_idx + 8) % FEEDBACK_ACCUMULATOR_SIZE; frames_consumed_in_urb += frames_this_ms; } tascam->playback_frames_consumed += frames_consumed_in_urb; if (tascam->playback_frames_consumed >= runtime->buffer_size) tascam->playback_frames_consumed %= runtime->buffer_size; spin_unlock_irqrestore(&tascam->lock, flags); snd_pcm_period_elapsed(substream); resubmit: if (atomic_read(&tascam->feedback_active)) { urb->dev = tascam->dev; ret = usb_submit_urb(urb, GFP_ATOMIC); if (ret < 0) dev_err_ratelimited(tascam->card->dev, "Failed to resubmit feedback URB: %d\n", ret); } } static int tascam_pcm_trigger(struct snd_pcm_substream *substream, int cmd) { struct tascam_card *tascam = snd_pcm_substream_chip(substream); unsigned long flags; int err = 0; int i; bool start_streaming = false; spin_lock_irqsave(&tascam->lock, flags); switch (cmd) { case SNDRV_PCM_TRIGGER_START: case SNDRV_PCM_TRIGGER_RESUME: if (!atomic_read(&tascam->playback_active)) { atomic_set(&tascam->playback_active, 1); atomic_set(&tascam->feedback_active, 1); start_streaming = true; } break; case SNDRV_PCM_TRIGGER_STOP: case SNDRV_PCM_TRIGGER_SUSPEND: case SNDRV_PCM_TRIGGER_PAUSE_PUSH: atomic_set(&tascam->playback_active, 0); atomic_set(&tascam->feedback_active, 0); break; default: err = -EINVAL; break; } spin_unlock_irqrestore(&tascam->lock, flags); if (err < 0) return err; if (start_streaming) { for (i = 0; i < NUM_PLAYBACK_URBS; i++) { err = usb_submit_urb(tascam->playback_urbs[i], GFP_ATOMIC); if (err < 0) goto stop_and_kill; } for (i = 0; i < NUM_FEEDBACK_URBS; i++) { err = usb_submit_urb(tascam->feedback_urbs[i], GFP_ATOMIC); if (err < 0) goto stop_and_kill; } } else { stop_and_kill: if (start_streaming) { atomic_set(&tascam->playback_active, 0); atomic_set(&tascam->feedback_active, 0); } for (i = 0; i < NUM_PLAYBACK_URBS; i++) usb_kill_urb(tascam->playback_urbs[i]); for (i = 0; i < NUM_FEEDBACK_URBS; i++) usb_kill_urb(tascam->feedback_urbs[i]); } return err; } static snd_pcm_uframes_t tascam_pcm_pointer(struct snd_pcm_substream *substream) { struct tascam_card *tascam = snd_pcm_substream_chip(substream); return tascam->playback_frames_consumed; } static int tascam_pcm_prepare(struct snd_pcm_substream *substream) { struct tascam_card *tascam = snd_pcm_substream_chip(substream); struct snd_pcm_runtime *runtime = substream->runtime; unsigned long flags; int i, u; size_t nominal_frames_per_packet; size_t nominal_bytes_per_packet; size_t total_bytes_in_urb; spin_lock_irqsave(&tascam->lock, flags); tascam->driver_playback_pos = 0; tascam->playback_frames_consumed = 0; tascam->feedback_pattern_in_idx = 0; tascam->feedback_pattern_out_idx = 0; tascam->feedback_urb_skip_count = NUM_FEEDBACK_URBS * 2; nominal_frames_per_packet = runtime->rate / 8000; for (i = 0; i < FEEDBACK_ACCUMULATOR_SIZE; i++) tascam->feedback_accumulator_pattern[i] = nominal_frames_per_packet; nominal_bytes_per_packet = nominal_frames_per_packet * DEVICE_BYTES_PER_FRAME; total_bytes_in_urb = nominal_bytes_per_packet * PLAYBACK_URB_ISO_PACKETS; if (total_bytes_in_urb > tascam->playback_urb_alloc_size) { dev_err(tascam->card->dev, "Prepare: Nominal URB size %zu > allocated %zu\n", total_bytes_in_urb, tascam->playback_urb_alloc_size); spin_unlock_irqrestore(&tascam->lock, flags); return -EINVAL; } for (u = 0; u < NUM_PLAYBACK_URBS; u++) { struct urb *urb = tascam->playback_urbs[u]; memset(urb->transfer_buffer, 0, total_bytes_in_urb); urb->transfer_buffer_length = total_bytes_in_urb; for (i = 0; i < PLAYBACK_URB_ISO_PACKETS; i++) { urb->iso_frame_desc[i].offset = i * nominal_bytes_per_packet; urb->iso_frame_desc[i].length = nominal_bytes_per_packet; } } spin_unlock_irqrestore(&tascam->lock, flags); return 0; } static int tascam_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params) { struct tascam_card *tascam = snd_pcm_substream_chip(substream); int err; unsigned int rate = params_rate(params); switch (rate) { case 44100: tascam->feedback_patterns = patterns_44khz; tascam->feedback_base_value = 42; tascam->feedback_max_value = 46; break; case 48000: tascam->feedback_patterns = patterns_48khz; tascam->feedback_base_value = 46; tascam->feedback_max_value = 50; break; case 88200: tascam->feedback_patterns = patterns_88khz; tascam->feedback_base_value = 86; tascam->feedback_max_value = 90; break; case 96000: tascam->feedback_patterns = patterns_96khz; tascam->feedback_base_value = 94; tascam->feedback_max_value = 98; break; default: dev_err(tascam->card->dev, "Unsupported sample rate for feedback: %u\n", rate); return -EINVAL; } err = us144mkii_configure_device_for_rate(tascam, rate); if (err < 0) { dev_err(tascam->card->dev, "Failed to set hardware rate to %u: %d\n", rate, err); return err; } return snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(params)); } static int tascam_pcm_hw_free(struct snd_pcm_substream *substream) { return snd_pcm_lib_free_pages(substream); } static int tascam_pcm_open(struct snd_pcm_substream *substream) { struct tascam_card *tascam = snd_pcm_substream_chip(substream); struct snd_pcm_runtime *runtime = substream->runtime; int i, j; size_t max_frames_per_packet, max_packet_size; runtime->hw = tascam_pcm_hw; tascam->playback_substream = substream; atomic_set(&tascam->playback_active, 0); atomic_set(&tascam->feedback_active, 0); max_frames_per_packet = (MAX_SUPPORTED_RATE / 8000) + 2; max_packet_size = max_frames_per_packet * DEVICE_BYTES_PER_FRAME; tascam->playback_urb_alloc_size = max_packet_size * PLAYBACK_URB_ISO_PACKETS; if (tascam->playback_urb_alloc_size == 0) { dev_err(tascam->card->dev, "Calculated playback_urb_alloc_size is zero.\n"); return -EINVAL; } for (i = 0; i < NUM_PLAYBACK_URBS; i++) { struct urb *urb = usb_alloc_urb(PLAYBACK_URB_ISO_PACKETS, GFP_KERNEL); if (!urb) goto error_free_urbs; tascam->playback_urbs[i] = urb; urb->transfer_buffer = usb_alloc_coherent(tascam->dev, tascam->playback_urb_alloc_size, GFP_KERNEL, &urb->transfer_dma); if (!urb->transfer_buffer) { goto error_free_urbs; } urb->dev = tascam->dev; urb->pipe = usb_sndisocpipe(tascam->dev, EP_AUDIO_OUT); urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; urb->interval = 1; urb->context = tascam; urb->complete = playback_urb_complete; urb->number_of_packets = PLAYBACK_URB_ISO_PACKETS; } tascam->feedback_urb_alloc_size = FEEDBACK_PACKET_SIZE * CURRENT_LATENCY_PACKETS; for (i = 0; i < NUM_FEEDBACK_URBS; i++) { struct urb *f_urb = usb_alloc_urb(CURRENT_LATENCY_PACKETS, GFP_KERNEL); if (!f_urb) goto error_free_urbs; tascam->feedback_urbs[i] = f_urb; f_urb->transfer_buffer = usb_alloc_coherent(tascam->dev, tascam->feedback_urb_alloc_size, GFP_KERNEL, &f_urb->transfer_dma); if (!f_urb->transfer_buffer) goto error_free_urbs; f_urb->dev = tascam->dev; f_urb->pipe = usb_rcvisocpipe(tascam->dev, EP_PLAYBACK_FEEDBACK); f_urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; f_urb->interval = 4; f_urb->context = tascam; f_urb->complete = feedback_urb_complete; f_urb->number_of_packets = CURRENT_LATENCY_PACKETS; f_urb->transfer_buffer_length = tascam->feedback_urb_alloc_size; for (j = 0; j < CURRENT_LATENCY_PACKETS; j++) { f_urb->iso_frame_desc[j].offset = j * FEEDBACK_PACKET_SIZE; f_urb->iso_frame_desc[j].length = FEEDBACK_PACKET_SIZE; } } return 0; error_free_urbs: for (i = 0; i < NUM_FEEDBACK_URBS; i++) { if (tascam->feedback_urbs[i]) { usb_free_coherent(tascam->dev, tascam->feedback_urb_alloc_size, tascam->feedback_urbs[i]->transfer_buffer, tascam->feedback_urbs[i]->transfer_dma); usb_free_urb(tascam->feedback_urbs[i]); tascam->feedback_urbs[i] = NULL; } } for (i = 0; i < NUM_PLAYBACK_URBS; i++) { if (tascam->playback_urbs[i]) { usb_free_coherent(tascam->dev, tascam->playback_urb_alloc_size, tascam->playback_urbs[i]->transfer_buffer, tascam->playback_urbs[i]->transfer_dma); usb_free_urb(tascam->playback_urbs[i]); tascam->playback_urbs[i] = NULL; } } return -ENOMEM; } static int tascam_pcm_close(struct snd_pcm_substream *substream) { struct tascam_card *tascam = snd_pcm_substream_chip(substream); int i; atomic_set(&tascam->playback_active, 0); atomic_set(&tascam->feedback_active, 0); for (i = 0; i < NUM_PLAYBACK_URBS; i++) { if (tascam->playback_urbs[i]) { usb_kill_urb(tascam->playback_urbs[i]); usb_free_coherent(tascam->dev, tascam->playback_urb_alloc_size, tascam->playback_urbs[i]->transfer_buffer, tascam->playback_urbs[i]->transfer_dma); usb_free_urb(tascam->playback_urbs[i]); tascam->playback_urbs[i] = NULL; } } for (i = 0; i < NUM_FEEDBACK_URBS; i++) { if (tascam->feedback_urbs[i]) { usb_kill_urb(tascam->feedback_urbs[i]); usb_free_coherent(tascam->dev, tascam->feedback_urb_alloc_size, tascam->feedback_urbs[i]->transfer_buffer, tascam->feedback_urbs[i]->transfer_dma); usb_free_urb(tascam->feedback_urbs[i]); tascam->feedback_urbs[i] = NULL; } } tascam->playback_substream = NULL; return 0; } static const struct usb_device_id tascam_id_table[] = { { USB_DEVICE(TASCAM_VID, TASCAM_PID) }, { } }; MODULE_DEVICE_TABLE(usb, tascam_id_table); static struct usb_driver tascam_alsa_driver = { .name = DRIVER_NAME, .probe = tascam_probe, .disconnect = tascam_disconnect, .id_table = tascam_id_table, }; module_usb_driver(tascam_alsa_driver);