371 lines
11 KiB
C
371 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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// Copyright (c) 2025 Šerif Rami <ramiserifpersia@gmail.com>
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#include "us144mkii.h"
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/**
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* fpo_init_pattern() - Generates a packet distribution pattern.
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* @size: The number of elements in the pattern array (e.g., 8).
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* @pattern_array: Pointer to the array to be populated.
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* @initial_value: The base value to initialize each element with.
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* @target_sum: The desired sum of all elements in the final array.
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*
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* This function initializes an array with a base value and then iteratively
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* adjusts the elements to match a target sum, distributing the difference
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* as evenly as possible.
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*/
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static void fpo_init_pattern(unsigned int size, unsigned int *pattern_array,
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unsigned int initial_value, int target_sum)
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{
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int diff, i;
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if (!size)
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return;
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for (i = 0; i < size; ++i)
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pattern_array[i] = initial_value;
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diff = target_sum - (size * initial_value);
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for (i = 0; i < abs(diff); ++i) {
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if (diff > 0)
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pattern_array[i]++;
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else
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pattern_array[i]--;
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}
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}
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const struct snd_pcm_hardware tascam_pcm_hw = {
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.info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
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SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP_VALID |
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SNDRV_PCM_INFO_PAUSE | SNDRV_PCM_INFO_RESUME),
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.formats = SNDRV_PCM_FMTBIT_S24_3LE,
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.rates = (SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 |
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SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000),
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.rate_min = 44100,
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.rate_max = 96000,
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.channels_min = NUM_CHANNELS,
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.channels_max = NUM_CHANNELS,
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.buffer_bytes_max = 1024 * 1024,
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.period_bytes_min = 48 * BYTES_PER_FRAME,
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.period_bytes_max = 1024 * BYTES_PER_FRAME,
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.periods_min = 2,
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.periods_max = 1024,
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};
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void process_playback_routing_us144mkii(struct tascam_card *tascam,
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const u8 *src_buffer, u8 *dst_buffer,
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size_t frames)
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{
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size_t f;
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const u8 *src_12, *src_34;
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u8 *dst_line, *dst_digital;
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for (f = 0; f < frames; ++f) {
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src_12 = src_buffer + f * BYTES_PER_FRAME;
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src_34 = src_12 + (2 * BYTES_PER_SAMPLE);
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dst_line = dst_buffer + f * BYTES_PER_FRAME;
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dst_digital = dst_line + (2 * BYTES_PER_SAMPLE);
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/* LINE OUTPUTS (ch1/2 on device) */
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if (tascam->line_out_source == 0) /* "ch1 and ch2" */
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memcpy(dst_line, src_12, 2 * BYTES_PER_SAMPLE);
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else /* "ch3 and ch4" */
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memcpy(dst_line, src_34, 2 * BYTES_PER_SAMPLE);
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/* DIGITAL OUTPUTS (ch3/4 on device) */
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if (tascam->digital_out_source == 0) /* "ch1 and ch2" */
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memcpy(dst_digital, src_12, 2 * BYTES_PER_SAMPLE);
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else /* "ch3 and ch4" */
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memcpy(dst_digital, src_34, 2 * BYTES_PER_SAMPLE);
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}
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}
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void process_capture_routing_us144mkii(struct tascam_card *tascam,
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const s32 *decoded_block,
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s32 *routed_block)
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{
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int f;
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const s32 *src_frame;
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s32 *dst_frame;
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for (f = 0; f < FRAMES_PER_DECODE_BLOCK; f++) {
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src_frame = decoded_block + (f * DECODED_CHANNELS_PER_FRAME);
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dst_frame = routed_block + (f * DECODED_CHANNELS_PER_FRAME);
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/* ch1 and ch2 Source */
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if (tascam->capture_12_source == 0) { /* analog inputs */
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dst_frame[0] = src_frame[0]; /* Analog L */
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dst_frame[1] = src_frame[1]; /* Analog R */
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} else { /* digital inputs */
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dst_frame[0] = src_frame[2]; /* Digital L */
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dst_frame[1] = src_frame[3]; /* Digital R */
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}
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/* ch3 and ch4 Source */
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if (tascam->capture_34_source == 0) { /* analog inputs */
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dst_frame[2] = src_frame[0]; /* Analog L (Duplicate) */
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dst_frame[3] = src_frame[1]; /* Analog R (Duplicate) */
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} else { /* digital inputs */
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dst_frame[2] = src_frame[2]; /* Digital L */
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dst_frame[3] = src_frame[3]; /* Digital R */
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}
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}
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}
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int us144mkii_configure_device_for_rate(struct tascam_card *tascam, int rate)
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{
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struct usb_device *dev = tascam->dev;
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u8 *rate_payload_buf __free(kfree) = NULL;
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u16 rate_vendor_wValue;
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int err = 0;
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const u8 *current_payload_src;
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static const u8 payload_44100[] = { 0x44, 0xac, 0x00 };
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static const u8 payload_48000[] = { 0x80, 0xbb, 0x00 };
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static const u8 payload_88200[] = { 0x88, 0x58, 0x01 };
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static const u8 payload_96000[] = { 0x00, 0x77, 0x01 };
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switch (rate) {
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case 44100:
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current_payload_src = payload_44100;
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rate_vendor_wValue = REG_ADDR_RATE_44100;
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break;
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case 48000:
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current_payload_src = payload_48000;
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rate_vendor_wValue = REG_ADDR_RATE_48000;
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break;
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case 88200:
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current_payload_src = payload_88200;
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rate_vendor_wValue = REG_ADDR_RATE_88200;
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break;
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case 96000:
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current_payload_src = payload_96000;
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rate_vendor_wValue = REG_ADDR_RATE_96000;
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break;
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default:
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dev_err(&dev->dev,
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"Unsupported sample rate %d for configuration\n", rate);
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return -EINVAL;
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}
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rate_payload_buf = kmemdup(current_payload_src, 3, GFP_KERNEL);
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if (!rate_payload_buf)
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return -ENOMEM;
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dev_info(&dev->dev, "Configuring device for %d Hz\n", rate);
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err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
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VENDOR_REQ_MODE_CONTROL, RT_H2D_VENDOR_DEV,
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MODE_VAL_CONFIG, 0x0000, NULL, 0,
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USB_CTRL_TIMEOUT_MS);
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if (err < 0)
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goto fail;
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err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
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RT_H2D_CLASS_EP, UAC_SAMPLING_FREQ_CONTROL,
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EP_AUDIO_IN, rate_payload_buf, 3,
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USB_CTRL_TIMEOUT_MS);
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if (err < 0)
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goto fail;
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err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), UAC_SET_CUR,
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RT_H2D_CLASS_EP, UAC_SAMPLING_FREQ_CONTROL,
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EP_AUDIO_OUT, rate_payload_buf, 3,
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USB_CTRL_TIMEOUT_MS);
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if (err < 0)
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goto fail;
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err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
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VENDOR_REQ_REGISTER_WRITE, RT_H2D_VENDOR_DEV,
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REG_ADDR_UNKNOWN_0D, REG_VAL_ENABLE, NULL, 0,
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USB_CTRL_TIMEOUT_MS);
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if (err < 0)
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goto fail;
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err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
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VENDOR_REQ_REGISTER_WRITE, RT_H2D_VENDOR_DEV,
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REG_ADDR_UNKNOWN_0E, REG_VAL_ENABLE, NULL, 0,
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USB_CTRL_TIMEOUT_MS);
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if (err < 0)
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goto fail;
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err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
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VENDOR_REQ_REGISTER_WRITE, RT_H2D_VENDOR_DEV,
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REG_ADDR_UNKNOWN_0F, REG_VAL_ENABLE, NULL, 0,
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USB_CTRL_TIMEOUT_MS);
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if (err < 0)
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goto fail;
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err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
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VENDOR_REQ_REGISTER_WRITE, RT_H2D_VENDOR_DEV,
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rate_vendor_wValue, REG_VAL_ENABLE, NULL, 0,
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USB_CTRL_TIMEOUT_MS);
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if (err < 0)
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goto fail;
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err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
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VENDOR_REQ_REGISTER_WRITE, RT_H2D_VENDOR_DEV,
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REG_ADDR_UNKNOWN_11, REG_VAL_ENABLE, NULL, 0,
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USB_CTRL_TIMEOUT_MS);
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if (err < 0)
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goto fail;
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err = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
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VENDOR_REQ_MODE_CONTROL, RT_H2D_VENDOR_DEV,
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MODE_VAL_STREAM_START, 0x0000, NULL, 0,
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USB_CTRL_TIMEOUT_MS);
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if (err < 0)
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goto fail;
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return 0;
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fail:
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dev_err(&dev->dev,
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"Device configuration failed at rate %d with error %d\n", rate,
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err);
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return err;
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}
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int tascam_pcm_hw_params(struct snd_pcm_substream *substream,
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struct snd_pcm_hw_params *params)
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{
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struct tascam_card *tascam = snd_pcm_substream_chip(substream);
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int err;
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unsigned int rate = params_rate(params);
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
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tascam->fpo.sample_rate_khz = rate / 1000;
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tascam->fpo.base_feedback_value = tascam->fpo.sample_rate_khz;
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tascam->fpo.feedback_offset = 2;
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tascam->fpo.current_index = 0;
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tascam->fpo.previous_index = 0;
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tascam->fpo.sync_locked = false;
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unsigned int initial_value = tascam->fpo.sample_rate_khz / 8;
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for (int i = 0; i < 5; i++) {
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int target_sum = tascam->fpo.sample_rate_khz -
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tascam->fpo.feedback_offset + i;
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fpo_init_pattern(8, tascam->fpo.full_frame_patterns[i],
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initial_value, target_sum);
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}
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}
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if (tascam->current_rate != rate) {
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err = us144mkii_configure_device_for_rate(tascam, rate);
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if (err < 0) {
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tascam->current_rate = 0;
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return err;
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}
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tascam->current_rate = rate;
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}
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return 0;
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}
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int tascam_pcm_hw_free(struct snd_pcm_substream *substream)
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{
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return 0;
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}
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int tascam_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
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{
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struct tascam_card *tascam = snd_pcm_substream_chip(substream);
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int err = 0;
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int i;
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bool do_start = false;
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bool do_stop = false;
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scoped_guard(spinlock_irqsave, &tascam->lock) {
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switch (cmd) {
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case SNDRV_PCM_TRIGGER_START:
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case SNDRV_PCM_TRIGGER_RESUME:
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if (!atomic_read(&tascam->playback_active)) {
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atomic_set(&tascam->playback_active, 1);
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atomic_set(&tascam->capture_active, 1);
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do_start = true;
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}
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break;
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case SNDRV_PCM_TRIGGER_STOP:
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case SNDRV_PCM_TRIGGER_SUSPEND:
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case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
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if (atomic_read(&tascam->playback_active)) {
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atomic_set(&tascam->playback_active, 0);
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atomic_set(&tascam->capture_active, 0);
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do_stop = true;
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}
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break;
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default:
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err = -EINVAL;
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break;
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}
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}
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if (do_start) {
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if (atomic_read(&tascam->active_urbs) > 0) {
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dev_warn(tascam->card->dev,
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"Cannot start, URBs still active.\n");
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return -EAGAIN;
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}
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for (i = 0; i < NUM_FEEDBACK_URBS; i++) {
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usb_get_urb(tascam->feedback_urbs[i]);
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usb_anchor_urb(tascam->feedback_urbs[i],
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&tascam->feedback_anchor);
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err = usb_submit_urb(tascam->feedback_urbs[i],
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GFP_ATOMIC);
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if (err < 0) {
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usb_unanchor_urb(tascam->feedback_urbs[i]);
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usb_put_urb(tascam->feedback_urbs[i]);
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atomic_dec(&tascam->active_urbs);
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goto start_rollback;
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}
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atomic_inc(&tascam->active_urbs);
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}
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for (i = 0; i < NUM_PLAYBACK_URBS; i++) {
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usb_get_urb(tascam->playback_urbs[i]);
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usb_anchor_urb(tascam->playback_urbs[i],
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&tascam->playback_anchor);
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err = usb_submit_urb(tascam->playback_urbs[i],
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GFP_ATOMIC);
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if (err < 0) {
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usb_unanchor_urb(tascam->playback_urbs[i]);
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usb_put_urb(tascam->playback_urbs[i]);
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atomic_dec(&tascam->active_urbs);
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goto start_rollback;
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}
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atomic_inc(&tascam->active_urbs);
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}
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for (i = 0; i < NUM_CAPTURE_URBS; i++) {
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usb_get_urb(tascam->capture_urbs[i]);
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usb_anchor_urb(tascam->capture_urbs[i],
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&tascam->capture_anchor);
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err = usb_submit_urb(tascam->capture_urbs[i],
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GFP_ATOMIC);
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if (err < 0) {
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usb_unanchor_urb(tascam->capture_urbs[i]);
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usb_put_urb(tascam->capture_urbs[i]);
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atomic_dec(&tascam->active_urbs);
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goto start_rollback;
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}
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atomic_inc(&tascam->active_urbs);
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}
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return 0;
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start_rollback:
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dev_err(tascam->card->dev,
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"Failed to submit URBs to start stream: %d\n", err);
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do_stop = true;
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}
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if (do_stop)
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schedule_work(&tascam->stop_work);
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return err;
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}
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int tascam_init_pcm(struct snd_pcm *pcm)
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{
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struct tascam_card *tascam = pcm->private_data;
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snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &tascam_playback_ops);
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snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &tascam_capture_ops);
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snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS,
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tascam->dev->dev.parent, 64 * 1024,
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tascam_pcm_hw.buffer_bytes_max);
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return 0;
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}
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