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Merge branch 'main' into wip-capture

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serifpersia 2025-07-17 22:53:25 +02:00 committed by GitHub
parent 2b6fe98021 8259275c9e
commit 507fb082ef
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1 changed files with 140 additions and 129 deletions
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us144mkii.c
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@ -18,6 +18,11 @@ MODULE_LICENSE("GPL v2");
#define DRIVER_NAME "us144mkii" #define DRIVER_NAME "us144mkii"
#define DRIVER_VERSION "1.5" #define DRIVER_VERSION "1.5"
/*
* TODO:
* - Implement MIDI IN/OUT.
*/
/* --- Module Parameters --- */ /* --- Module Parameters --- */
static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
@ -90,21 +95,11 @@ struct tascam_card {
struct snd_card *card; struct snd_card *card;
struct snd_pcm *pcm; struct snd_pcm *pcm;
/* Playback stream */
struct snd_pcm_substream *playback_substream; struct snd_pcm_substream *playback_substream;
struct urb *playback_urbs[NUM_PLAYBACK_URBS]; struct urb *playback_urbs[NUM_PLAYBACK_URBS];
size_t playback_urb_alloc_size; size_t playback_urb_alloc_size;
struct urb *feedback_urbs[NUM_FEEDBACK_URBS];
size_t feedback_urb_alloc_size;
atomic_t playback_active;
u64 playback_frames_consumed;
snd_pcm_uframes_t driver_playback_pos;
u64 last_period_pos;
/* Capture stream */
struct snd_pcm_substream *capture_substream; struct snd_pcm_substream *capture_substream;
struct urb *capture_urbs[NUM_CAPTURE_URBS];
size_t capture_urb_alloc_size;
atomic_t capture_active; atomic_t capture_active;
snd_pcm_uframes_t driver_capture_pos; snd_pcm_uframes_t driver_capture_pos;
u64 capture_frames_processed; u64 capture_frames_processed;
@ -114,9 +109,11 @@ struct tascam_card {
volatile size_t capture_ring_buffer_write_ptr; volatile size_t capture_ring_buffer_write_ptr;
u8 *capture_decode_raw_block; u8 *capture_decode_raw_block;
s32 *capture_decode_dst_block; s32 *capture_decode_dst_block;
struct work_struct capture_work; // For deferred processing struct work_struct capture_work;
struct urb *feedback_urbs[NUM_FEEDBACK_URBS];
size_t feedback_urb_alloc_size;
/* Shared state & Routing Matrix */
spinlock_t lock; spinlock_t lock;
atomic_t active_urbs; atomic_t active_urbs;
int current_rate; int current_rate;
@ -133,6 +130,13 @@ struct tascam_card {
unsigned int feedback_consecutive_errors; unsigned int feedback_consecutive_errors;
unsigned int feedback_urb_skip_count; unsigned int feedback_urb_skip_count;
u64 playback_frames_consumed;
snd_pcm_uframes_t driver_playback_pos;
u64 last_period_pos;
u64 capture_frames_produced;
u64 last_capture_period_pos;
const unsigned int (*feedback_patterns)[8]; const unsigned int (*feedback_patterns)[8];
unsigned int feedback_base_value; unsigned int feedback_base_value;
unsigned int feedback_max_value; unsigned int feedback_max_value;
@ -152,6 +156,14 @@ static int tascam_suspend(struct usb_interface *intf, pm_message_t message);
static int tascam_resume(struct usb_interface *intf); static int tascam_resume(struct usb_interface *intf);
/* --- Sysfs Attribute for Driver Version --- */ /* --- Sysfs Attribute for Driver Version --- */
/**
* driver_version_show - Sysfs callback to show the driver version.
* @dev: The device structure.
* @attr: The device attribute structure.
* @buf: The buffer to write the version string into.
*
* Returns: The number of bytes written.
*/
static ssize_t driver_version_show(struct device *dev, static ssize_t driver_version_show(struct device *dev,
struct device_attribute *attr, char *buf) struct device_attribute *attr, char *buf)
{ {
@ -159,6 +171,7 @@ static ssize_t driver_version_show(struct device *dev,
} }
static DEVICE_ATTR_RO(driver_version); static DEVICE_ATTR_RO(driver_version);
/* --- ALSA Control Definitions --- */
/* --- ALSA Control Definitions --- */ /* --- ALSA Control Definitions --- */
static const char * const latency_profile_texts[] = {"Low", "Normal", "High"}; static const char * const latency_profile_texts[] = {"Low", "Normal", "High"};
static const char * const playback_source_texts[] = {"Playback 1-2", "Playback 3-4"}; static const char * const playback_source_texts[] = {"Playback 1-2", "Playback 3-4"};
@ -166,13 +179,13 @@ static const char * const capture_source_texts[] = {"Analog In", "Digital In"};
static int tascam_latency_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) static int tascam_latency_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{ {
uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED; uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
uinfo->count = 1; uinfo->count = 1;
uinfo->value.enumerated.items = 3; uinfo->value.enumerated.items = 3;
if (uinfo->value.enumerated.item >= 3) if (uinfo->value.enumerated.item >= 3)
uinfo->value.enumerated.item = 2; uinfo->value.enumerated.item = 2;
strcpy(uinfo->value.enumerated.name, latency_profile_texts[uinfo->value.enumerated.item]); strcpy(uinfo->value.enumerated.name, latency_profile_texts[uinfo->value.enumerated.item]);
return 0; return 0;
} }
static int tascam_latency_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) static int tascam_latency_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
@ -198,19 +211,19 @@ static int tascam_latency_put(struct snd_kcontrol *kcontrol, struct snd_ctl_elem
} }
static const struct snd_kcontrol_new tascam_latency_control = { static const struct snd_kcontrol_new tascam_latency_control = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = "Latency Profile", .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = "Latency Profile",
.info = tascam_latency_info, .get = tascam_latency_get, .put = tascam_latency_put, .info = tascam_latency_info, .get = tascam_latency_get, .put = tascam_latency_put,
}; };
static int tascam_playback_source_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) static int tascam_playback_source_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{ {
uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED; uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
uinfo->count = 1; uinfo->count = 1;
uinfo->value.enumerated.items = 2; uinfo->value.enumerated.items = 2;
if (uinfo->value.enumerated.item >= 2) if (uinfo->value.enumerated.item >= 2)
uinfo->value.enumerated.item = 1; uinfo->value.enumerated.item = 1;
strcpy(uinfo->value.enumerated.name, playback_source_texts[uinfo->value.enumerated.item]); strcpy(uinfo->value.enumerated.name, playback_source_texts[uinfo->value.enumerated.item]);
return 0; return 0;
} }
static int tascam_line_out_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) static int tascam_line_out_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
@ -232,8 +245,8 @@ static int tascam_line_out_put(struct snd_kcontrol *kcontrol, struct snd_ctl_ele
} }
static const struct snd_kcontrol_new tascam_line_out_control = { static const struct snd_kcontrol_new tascam_line_out_control = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = "Line Out Source", .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = "Line Out Source",
.info = tascam_playback_source_info, .get = tascam_line_out_get, .put = tascam_line_out_put, .info = tascam_playback_source_info, .get = tascam_line_out_get, .put = tascam_line_out_put,
}; };
static int tascam_digital_out_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) static int tascam_digital_out_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
@ -255,19 +268,19 @@ static int tascam_digital_out_put(struct snd_kcontrol *kcontrol, struct snd_ctl_
} }
static const struct snd_kcontrol_new tascam_digital_out_control = { static const struct snd_kcontrol_new tascam_digital_out_control = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = "Digital Out Source", .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = "Digital Out Source",
.info = tascam_playback_source_info, .get = tascam_digital_out_get, .put = tascam_digital_out_put, .info = tascam_playback_source_info, .get = tascam_digital_out_get, .put = tascam_digital_out_put,
}; };
static int tascam_capture_source_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) static int tascam_capture_source_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{ {
uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED; uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
uinfo->count = 1; uinfo->count = 1;
uinfo->value.enumerated.items = 2; uinfo->value.enumerated.items = 2;
if (uinfo->value.enumerated.item >= 2) if (uinfo->value.enumerated.item >= 2)
uinfo->value.enumerated.item = 1; uinfo->value.enumerated.item = 1;
strcpy(uinfo->value.enumerated.name, capture_source_texts[uinfo->value.enumerated.item]); strcpy(uinfo->value.enumerated.name, capture_source_texts[uinfo->value.enumerated.item]);
return 0; return 0;
} }
static int tascam_capture_12_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) static int tascam_capture_12_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
@ -289,8 +302,8 @@ static int tascam_capture_12_put(struct snd_kcontrol *kcontrol, struct snd_ctl_e
} }
static const struct snd_kcontrol_new tascam_capture_12_control = { static const struct snd_kcontrol_new tascam_capture_12_control = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = "Capture 1-2 Source", .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = "Capture 1-2 Source",
.info = tascam_capture_source_info, .get = tascam_capture_12_get, .put = tascam_capture_12_put, .info = tascam_capture_source_info, .get = tascam_capture_12_get, .put = tascam_capture_12_put,
}; };
static int tascam_capture_34_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) static int tascam_capture_34_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
@ -312,10 +325,19 @@ static int tascam_capture_34_put(struct snd_kcontrol *kcontrol, struct snd_ctl_e
} }
static const struct snd_kcontrol_new tascam_capture_34_control = { static const struct snd_kcontrol_new tascam_capture_34_control = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = "Capture 3-4 Source", .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = "Capture 3-4 Source",
.info = tascam_capture_source_info, .get = tascam_capture_34_get, .put = tascam_capture_34_put, .info = tascam_capture_source_info, .get = tascam_capture_34_get, .put = tascam_capture_34_put,
}; };
/**
* tascam_samplerate_info - ALSA control info callback for the sample rate.
* @kcontrol: The kcontrol instance.
* @uinfo: The user control element info structure to fill.
*
* Provides information about the read-only sample rate control.
*
* Returns: 0 on success.
*/
static int tascam_samplerate_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo) static int tascam_samplerate_info(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_info *uinfo)
{ {
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER; uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
@ -325,6 +347,17 @@ static int tascam_samplerate_info(struct snd_kcontrol *kcontrol, struct snd_ctl_
return 0; return 0;
} }
/**
* tascam_samplerate_get - ALSA control get callback for the sample rate.
* @kcontrol: The kcontrol instance.
* @ucontrol: The user control element value structure to fill.
*
* Reports the current sample rate of the device. It first checks the driver's
* internal state. If no stream is active, it queries the device directly via
* a USB control message.
*
* Returns: 0 on success, or a negative error code on failure.
*/
static int tascam_samplerate_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol) static int tascam_samplerate_get(struct snd_kcontrol *kcontrol, struct snd_ctl_elem_value *ucontrol)
{ {
struct tascam_card *tascam = (struct tascam_card *)snd_kcontrol_chip(kcontrol); struct tascam_card *tascam = (struct tascam_card *)snd_kcontrol_chip(kcontrol);
@ -550,54 +583,26 @@ error:
return -ENOMEM; return -ENOMEM;
} }
static int tascam_playback_open(struct snd_pcm_substream *substream) static int tascam_pcm_open(struct snd_pcm_substream *substream)
{ {
struct tascam_card *tascam = snd_pcm_substream_chip(substream); struct tascam_card *tascam = snd_pcm_substream_chip(substream);
int err = 0; struct snd_pcm_runtime *runtime = substream->runtime;
int err;
substream->runtime->hw = tascam_pcm_hw; runtime->hw = tascam_pcm_hw;
tascam->playback_substream = substream; tascam->playback_substream = substream;
atomic_set(&tascam->playback_active, 0); atomic_set(&tascam->playback_active, 0);
if (!tascam->capture_substream) {
err = tascam_alloc_urbs(tascam); err = tascam_alloc_urbs(tascam);
if (err < 0) if (err < 0)
return err; return err;
}
return 0; return 0;
} }
static int tascam_capture_open(struct snd_pcm_substream *substream) static int tascam_pcm_close(struct snd_pcm_substream *substream)
{ {
struct tascam_card *tascam = snd_pcm_substream_chip(substream); struct tascam_card *tascam = snd_pcm_substream_chip(substream);
int err = 0;
substream->runtime->hw = tascam_pcm_hw;
tascam->capture_substream = substream;
atomic_set(&tascam->capture_active, 0);
if (!tascam->playback_substream) {
err = tascam_alloc_urbs(tascam);
if (err < 0)
return err;
}
return 0;
}
static int tascam_playback_close(struct snd_pcm_substream *substream)
{
struct tascam_card *tascam = snd_pcm_substream_chip(substream);
tascam->playback_substream = NULL;
if (!tascam->capture_substream)
tascam_free_urbs(tascam);
return 0;
}
static int tascam_capture_close(struct snd_pcm_substream *substream)
{
struct tascam_card *tascam = snd_pcm_substream_chip(substream);
tascam->capture_substream = NULL;
if (!tascam->playback_substream)
tascam_free_urbs(tascam); tascam_free_urbs(tascam);
return 0; return 0;
} }
@ -680,7 +685,7 @@ static int tascam_pcm_hw_params(struct snd_pcm_substream *substream,
if (err < 0) if (err < 0)
return err; return err;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { /* Set rate-dependent feedback patterns and values */
switch (rate) { switch (rate) {
case 44100: case 44100:
tascam->feedback_patterns = patterns_44khz; tascam->feedback_patterns = patterns_44khz;
@ -701,16 +706,14 @@ static int tascam_pcm_hw_params(struct snd_pcm_substream *substream,
default: default:
return -EINVAL; return -EINVAL;
} }
}
if (tascam->current_rate != rate) { /* Always re-configure hardware to ensure it's in a clean state */
err = us144mkii_configure_device_for_rate(tascam, rate); err = us144mkii_configure_device_for_rate(tascam, rate);
if (err < 0) { if (err < 0) {
tascam->current_rate = 0; tascam->current_rate = 0;
return err; return err;
} }
tascam->current_rate = rate; tascam->current_rate = rate;
}
return 0; return 0;
} }
@ -720,7 +723,7 @@ static int tascam_pcm_hw_free(struct snd_pcm_substream *substream)
return snd_pcm_lib_free_pages(substream); return snd_pcm_lib_free_pages(substream);
} }
static int tascam_playback_prepare(struct snd_pcm_substream *substream) static int tascam_pcm_prepare(struct snd_pcm_substream *substream)
{ {
struct tascam_card *tascam = snd_pcm_substream_chip(substream); struct tascam_card *tascam = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime; struct snd_pcm_runtime *runtime = substream->runtime;
@ -729,6 +732,7 @@ static int tascam_playback_prepare(struct snd_pcm_substream *substream)
size_t total_bytes_in_urb; size_t total_bytes_in_urb;
unsigned int feedback_packets; unsigned int feedback_packets;
/* Reset driver state for the new stream */
tascam->driver_playback_pos = 0; tascam->driver_playback_pos = 0;
tascam->playback_frames_consumed = 0; tascam->playback_frames_consumed = 0;
tascam->last_period_pos = 0; tascam->last_period_pos = 0;
@ -738,10 +742,12 @@ static int tascam_playback_prepare(struct snd_pcm_substream *substream)
tascam->feedback_consecutive_errors = 0; tascam->feedback_consecutive_errors = 0;
tascam->feedback_urb_skip_count = NUM_FEEDBACK_URBS; tascam->feedback_urb_skip_count = NUM_FEEDBACK_URBS;
/* Initialize feedback accumulator with nominal values */
nominal_frames_per_packet = runtime->rate / 8000; nominal_frames_per_packet = runtime->rate / 8000;
for (i = 0; i < FEEDBACK_ACCUMULATOR_SIZE; i++) for (i = 0; i < FEEDBACK_ACCUMULATOR_SIZE; i++)
tascam->feedback_accumulator_pattern[i] = nominal_frames_per_packet; tascam->feedback_accumulator_pattern[i] = nominal_frames_per_packet;
/* Validate and apply latency profile */
switch (tascam->latency_profile) { switch (tascam->latency_profile) {
case 0: feedback_packets = 1; break; /* Low */ case 0: feedback_packets = 1; break; /* Low */
case 1: feedback_packets = 2; break; /* Normal */ case 1: feedback_packets = 2; break; /* Normal */
@ -749,9 +755,11 @@ static int tascam_playback_prepare(struct snd_pcm_substream *substream)
default: feedback_packets = 2; default: feedback_packets = 2;
} }
/* Configure Feedback URBs */
for (i = 0; i < NUM_FEEDBACK_URBS; i++) { for (i = 0; i < NUM_FEEDBACK_URBS; i++) {
struct urb *f_urb = tascam->feedback_urbs[i]; struct urb *f_urb = tascam->feedback_urbs[i];
int j; int j;
f_urb->number_of_packets = feedback_packets; f_urb->number_of_packets = feedback_packets;
f_urb->transfer_buffer_length = feedback_packets * FEEDBACK_PACKET_SIZE; f_urb->transfer_buffer_length = feedback_packets * FEEDBACK_PACKET_SIZE;
for (j = 0; j < feedback_packets; j++) { for (j = 0; j < feedback_packets; j++) {
@ -760,11 +768,13 @@ static int tascam_playback_prepare(struct snd_pcm_substream *substream)
} }
} }
/* Configure Playback URBs */
nominal_bytes_per_packet = nominal_frames_per_packet * BYTES_PER_FRAME; nominal_bytes_per_packet = nominal_frames_per_packet * BYTES_PER_FRAME;
total_bytes_in_urb = nominal_bytes_per_packet * PLAYBACK_URB_PACKETS; total_bytes_in_urb = nominal_bytes_per_packet * PLAYBACK_URB_PACKETS;
for (u = 0; u < NUM_PLAYBACK_URBS; u++) { for (u = 0; u < NUM_PLAYBACK_URBS; u++) {
struct urb *urb = tascam->playback_urbs[u]; struct urb *urb = tascam->playback_urbs[u];
memset(urb->transfer_buffer, 0, tascam->playback_urb_alloc_size); memset(urb->transfer_buffer, 0, tascam->playback_urb_alloc_size);
urb->transfer_buffer_length = total_bytes_in_urb; urb->transfer_buffer_length = total_bytes_in_urb;
urb->number_of_packets = PLAYBACK_URB_PACKETS; urb->number_of_packets = PLAYBACK_URB_PACKETS;
@ -873,7 +883,7 @@ start_rollback:
return err; return err;
} }
static snd_pcm_uframes_t tascam_playback_pointer(struct snd_pcm_substream *substream) static snd_pcm_uframes_t tascam_pcm_pointer(struct snd_pcm_substream *substream)
{ {
struct tascam_card *tascam = snd_pcm_substream_chip(substream); struct tascam_card *tascam = snd_pcm_substream_chip(substream);
struct snd_pcm_runtime *runtime = substream->runtime; struct snd_pcm_runtime *runtime = substream->runtime;
@ -965,6 +975,7 @@ static void playback_urb_complete(struct urb *urb)
spin_lock_irqsave(&tascam->lock, flags); spin_lock_irqsave(&tascam->lock, flags);
/* Phase 1: Populate the isochronous frame descriptors from the accumulator. */
for (i = 0; i < urb->number_of_packets; i++) { for (i = 0; i < urb->number_of_packets; i++) {
unsigned int frames_for_packet; unsigned int frames_for_packet;
size_t bytes_for_packet; size_t bytes_for_packet;
@ -983,12 +994,15 @@ static void playback_urb_complete(struct urb *urb)
} }
urb->transfer_buffer_length = total_bytes_for_urb; urb->transfer_buffer_length = total_bytes_for_urb;
/* Phase 2: Atomically update the driver's position. */
offset_frames = tascam->driver_playback_pos; offset_frames = tascam->driver_playback_pos;
frames_to_copy = bytes_to_frames(runtime, total_bytes_for_urb); frames_to_copy = bytes_to_frames(runtime, total_bytes_for_urb);
tascam->driver_playback_pos = (offset_frames + frames_to_copy) % runtime->buffer_size; tascam->driver_playback_pos = (offset_frames + frames_to_copy) % runtime->buffer_size;
/* --- End of Critical Section --- */
spin_unlock_irqrestore(&tascam->lock, flags); spin_unlock_irqrestore(&tascam->lock, flags);
/* Phase 3: Perform the data copy OUTSIDE the lock. */
if (total_bytes_for_urb > 0) { if (total_bytes_for_urb > 0) {
int f; int f;
src_buf = runtime->dma_area; src_buf = runtime->dma_area;
@ -1063,6 +1077,7 @@ static void feedback_urb_complete(struct urb *urb)
spin_lock_irqsave(&tascam->lock, flags); spin_lock_irqsave(&tascam->lock, flags);
/* Hybrid Sync: Initial blind period for hardware to settle. */
if (tascam->feedback_urb_skip_count > 0) { if (tascam->feedback_urb_skip_count > 0) {
tascam->feedback_urb_skip_count--; tascam->feedback_urb_skip_count--;
goto unlock_and_continue; goto unlock_and_continue;
@ -1229,21 +1244,11 @@ static void tascam_capture_work_handler(struct work_struct *work)
return; return;
} }
while (atomic_read(&tascam->capture_active)) { if (runtime->period_size > 0) {
size_t write_ptr, read_ptr, available_data; u64 current_period = div_u64(tascam->playback_frames_consumed, runtime->period_size);
bool can_process; if (current_period > tascam->last_period_pos) {
tascam->last_period_pos = current_period;
spin_lock_irqsave(&tascam->lock, flags); playback_period_elapsed = true;
write_ptr = tascam->capture_ring_buffer_write_ptr;
read_ptr = tascam->capture_ring_buffer_read_ptr;
available_data = (write_ptr >= read_ptr) ? (write_ptr - read_ptr) : (CAPTURE_RING_BUFFER_SIZE - read_ptr + write_ptr);
can_process = (available_data >= RAW_BYTES_PER_DECODE_BLOCK);
if (can_process) {
size_t i;
for (i = 0; i < RAW_BYTES_PER_DECODE_BLOCK; i++)
raw_block[i] = tascam->capture_ring_buffer[(read_ptr + i) % CAPTURE_RING_BUFFER_SIZE];
tascam->capture_ring_buffer_read_ptr = (read_ptr + RAW_BYTES_PER_DECODE_BLOCK) % CAPTURE_RING_BUFFER_SIZE;
} }
spin_unlock_irqrestore(&tascam->lock, flags); spin_unlock_irqrestore(&tascam->lock, flags);
@ -1332,11 +1337,14 @@ static void capture_urb_complete(struct urb *urb)
schedule_work(&tascam->capture_work); schedule_work(&tascam->capture_work);
} }
urb->dev = tascam->dev;
ret = usb_submit_urb(urb, GFP_ATOMIC); ret = usb_submit_urb(urb, GFP_ATOMIC);
if (ret < 0) if (ret < 0)
dev_err_ratelimited(tascam->card->dev, "Failed to resubmit capture URB: %d\n", ret); dev_err_ratelimited(tascam->card->dev, "Failed to resubmit feedback URB: %d\n", ret);
} }
static int tascam_create_pcm(struct tascam_card *tascam) static int tascam_create_pcm(struct tascam_card *tascam)
{ {
struct snd_pcm *pcm; struct snd_pcm *pcm;
@ -1406,6 +1414,7 @@ static int tascam_resume(struct usb_interface *intf)
dev = tascam->dev; dev = tascam->dev;
dev_info(&intf->dev, "Resuming and re-initializing device...\n"); dev_info(&intf->dev, "Resuming and re-initializing device...\n");
/* Re-establish alternate settings for both interfaces */
err = usb_set_interface(dev, 0, 1); err = usb_set_interface(dev, 0, 1);
if (err < 0) { if (err < 0) {
dev_err(&intf->dev, "Resume: Set Alt Setting on Intf 0 failed: %d\n", err); dev_err(&intf->dev, "Resume: Set Alt Setting on Intf 0 failed: %d\n", err);
@ -1417,6 +1426,7 @@ static int tascam_resume(struct usb_interface *intf)
return err; return err;
} }
/* Re-configure the device for the last used sample rate. */
if (tascam->current_rate > 0) { if (tascam->current_rate > 0) {
dev_info(&intf->dev, "Restoring sample rate to %d Hz\n", tascam->current_rate); dev_info(&intf->dev, "Restoring sample rate to %d Hz\n", tascam->current_rate);
err = us144mkii_configure_device_for_rate(tascam, tascam->current_rate); err = us144mkii_configure_device_for_rate(tascam, tascam->current_rate);
@ -1479,7 +1489,7 @@ static int tascam_probe(struct usb_interface *intf, const struct usb_device_id *
tascam->digital_out_source = 1; tascam->digital_out_source = 1;
tascam->capture_12_source = 0; tascam->capture_12_source = 0;
tascam->capture_34_source = 1; tascam->capture_34_source = 1;
tascam->current_rate = 0; tascam->current_rate = 0; /* Not known until hw_params */
strscpy(card->driver, DRIVER_NAME, sizeof(card->driver)); strscpy(card->driver, DRIVER_NAME, sizeof(card->driver));
strscpy(card->shortname, "TASCAM US-144MKII", sizeof(card->shortname)); strscpy(card->shortname, "TASCAM US-144MKII", sizeof(card->shortname));
@ -1583,6 +1593,7 @@ static void tascam_disconnect(struct usb_interface *intf)
tascam->iface1 = NULL; tascam->iface1 = NULL;
} }
/* Decrement the device index to allow the next probe to use this slot. */
if (dev_idx > 0) if (dev_idx > 0)
dev_idx--; dev_idx--;