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motu.c
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motu.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* MOTU midi express 128 driver
* Code based on the Behringer BCD2000 driver
*
* Copyright (C) 2014 vampirefrog ([email protected])
* touched 2022 lost-bit ([email protected])
* support for micro express & micro lite added
*/
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/bitmap.h>
#include <linux/usb.h>
#include <linux/usb/audio.h>
#include <linux/version.h>
#include <linux/spinlock.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/rawmidi.h>
#define PREFIX "snd-motu: "
#define BUFSIZE 128
#define NUM_ISO 4
typedef enum
{
express_128,micro_express,micro_lite,express_xt
} en_motu_devices;
static const struct usb_device_id id_table[] = {
{ USB_DEVICE(0x07fd, 0x0001) },
{ },
};
struct motu_in_port {
struct snd_rawmidi_substream *substream;
unsigned char last_cmd;
unsigned char cmd_bytes_remaining;
unsigned char buf[64];
unsigned int buf_len;
unsigned int buf_send_len; // how much of the buffer can be sent
};
struct motu_out_port {
struct snd_rawmidi_substream *substream;
};
#define N_MBUF 64
struct motufifo
{
unsigned char mbuf[N_MBUF];
unsigned int p_in,p_out;
unsigned char last_cmd;
unsigned int rd_bytes;
unsigned int missing_bytes;
unsigned int buf_len;
unsigned int buf_send_len;
unsigned int cmd_len;
unsigned int remaining;
};
struct motu {
struct usb_device *dev;
struct snd_card *card;
struct usb_interface *intf;
int card_index;
int midi_out_active;
struct snd_rawmidi *rmidi;
struct motu_in_port in_ports[9];
struct motu_out_port out_ports[9];
unsigned char counter;
unsigned char midi_in_buf[BUFSIZE];
unsigned char midi_out_buf[BUFSIZE];
struct urb *midi_out_urb;
struct urb *midi_in_urb;
struct usb_anchor anchor;
en_motu_devices motu_type;
int n_ports_in;
int n_ports_out;
int last_out_port;
int last_in_port;
int in_state;
struct motufifo mfifo[9];
spinlock_t spinlock;
};
static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
static DEFINE_MUTEX(devices_mutex);
static DECLARE_BITMAP(devices_used, SNDRV_CARDS);
static struct usb_driver motu_driver;
#ifdef CONFIG_SND_DEBUG
static void motu_dump_buffer(const char *prefix, const char *buf, int len) {
print_hex_dump(KERN_DEBUG, prefix,
DUMP_PREFIX_NONE, 16, 1,
buf, len, false);
}
#else
static void motu_dump_buffer(const char *prefix, const char *buf, int len) {}
#endif
static int motu_midi_input_open(struct snd_rawmidi_substream *substream)
{
return 0;
}
static int motu_midi_input_close(struct snd_rawmidi_substream *substream)
{
return 0;
}
/* (de)register midi substream from client */
static void motu_midi_input_trigger(struct snd_rawmidi_substream *substream, int up) {
struct motu *motu = substream->rmidi->private_data;
if(substream->number >= motu->n_ports_in)
return;
motu->in_ports[substream->number].substream = up ? substream : NULL;
}
static int get_cmd_num_bytes(unsigned char b) {
static const int num_bytes[] = {
/* 8x */ 3,
/* 9x */ 3,
/* Ax */ 3,
/* Bx */ 3,
/* Cx */ 2,
/* Dx */ 2,
/* Ex */ 3,
};
static const int fx_bytes[] = {
/* F0 */ -1,
/* F1 */ 2,
/* F2 */ 1,
/* F3 */ 2,
/* F4 */ -1,
/* F5 */ -1,
/* F6 */ 1,
/* F7 */ 1,
/* F8 */ 1,
/* F9 */ 1,
/* FA */ 1,
/* FB */ 1,
/* FC */ 1,
/* FD */ -1,
/* FE */ 1,
/* FF */ 1,
};
if(b >= 0xf0)
return fx_bytes[b & 0x0f];
if(b >= 0x80)
return num_bytes[(b >> 4) - 8];
return -1;
}
static void motu_in_port_append_byte(struct motu *motu, int port, unsigned char b) {
if(motu->in_ports[port].buf_len < sizeof(motu->in_ports[port].buf))
motu->in_ports[port].buf[motu->in_ports[port].buf_len++] = b;
}
static void motu_in_port_write_byte(struct motu *motu, int port, unsigned char b) {
int num_bytes;
struct motu_in_port *in_port;
in_port = &motu->in_ports[port];
num_bytes = get_cmd_num_bytes(b) - 1;
if(num_bytes == 0) {
in_port->last_cmd = 0;
in_port->cmd_bytes_remaining = 0;
motu_in_port_append_byte(motu, port, b);
in_port->buf_send_len = in_port->buf_len;
} else if(num_bytes > 0) {
in_port->last_cmd = b;
in_port->cmd_bytes_remaining = num_bytes;
in_port->buf_send_len = in_port->buf_len;
motu_in_port_append_byte(motu, port, b);
} else if(in_port->last_cmd > 0) {
if(in_port->cmd_bytes_remaining <= 0) {
in_port->buf_send_len = in_port->buf_len;
motu_in_port_append_byte(motu, port, in_port->last_cmd);
num_bytes = get_cmd_num_bytes(in_port->last_cmd) - 1;
in_port->cmd_bytes_remaining = num_bytes;
}
in_port->cmd_bytes_remaining--;
motu_in_port_append_byte(motu, port, b);
if(in_port->cmd_bytes_remaining == 0) {
in_port->buf_send_len = in_port->buf_len;
}
} else {
// in a normal stream, this shouldn't be reached
motu_in_port_append_byte(motu, port, b);
in_port->buf_send_len = in_port->buf_len;
}
}
static int motu_in_port_get_buf_size(struct motu *motu, int port) {
if(motu->in_ports[port].buf_len <= motu->in_ports[port].buf_send_len)
return motu->in_ports[port].buf_len;
return motu->in_ports[port].buf_send_len;
}
static void motu_in_port_flush(struct motu *motu, int port) {
if(motu->in_ports[port].buf_send_len == 0)
return;
// Example:
// Note ON: 90 40 7f (Channel 1, note 40, velocity 127)
if(motu->in_ports[port].buf_len > motu->in_ports[port].buf_send_len) {
memcpy(motu->in_ports[port].buf, motu->in_ports[port].buf + motu->in_ports[port].buf_send_len, motu->in_ports[port].buf_len - motu->in_ports[port].buf_send_len);
}
motu->in_ports[port].buf_len -= motu->in_ports[port].buf_send_len;
motu->in_ports[port].buf_send_len = 0;
}
static void motu_midi_handle_input_prot1(struct motu *motu, const unsigned char *buf, unsigned int buf_len) {
struct snd_rawmidi_substream *midi_receive_substream;
int i, p;
// parsing state machine
int in_data = 0;
uint8_t mask = 0;
uint8_t chan = 0;
motu_dump_buffer(PREFIX "received from device: ", buf, buf_len);
if (buf_len < 2)
return;
for(i = 2; i < buf_len; i++) {
if(in_data) {
for(; chan < 8 && mask != 0; chan++) {
if((mask & 1) != 0) {
motu_in_port_write_byte(motu, chan, buf[i]);
mask >>= 1;
chan++;
break;
}
mask >>= 1;
}
if(mask == 0) {
in_data = 0;
}
} else {
in_data = 1;
chan = 0;
mask = buf[i];
if(mask == 0) {
in_data = 0;
}
}
}
for(p = 0; p < 8; p++) {
int len = motu_in_port_get_buf_size(motu, p);
if(len > 0) {
motu_dump_buffer(PREFIX "sending to userspace: ", motu->in_ports[p].buf, len);
if(motu->in_ports[p].substream) {
midi_receive_substream = READ_ONCE(motu->in_ports[p].substream);
if(midi_receive_substream != 0) {
snd_rawmidi_receive(midi_receive_substream, motu->in_ports[p].buf, len);
}
}
motu_in_port_flush(motu, p);
}
}
}
static void motu_midi_handle_input_prot2(struct motu *motu, const unsigned char *buf, unsigned int buf_len) {
struct snd_rawmidi_substream *midi_receive_substream;
int i;
// ignore 1st byte
i = 1;
while(i < buf_len)
{
switch(motu->in_state)
{
case 0 :
if(buf[i] == 0xF5)
motu->in_state = 1;
break;
case 1 : // desired port
if(buf[i] != 0xFF)
{
motu->last_in_port = buf[i];
motu->in_ports[motu->last_in_port].buf_len = 0;
motu->in_state = 2;
}
break;
case 2 : // data section
if(buf[i] != 0xFF)
{
if((buf[i] & 0x80) == 0)
{
motu->in_ports[motu->last_in_port].buf[motu->in_ports[motu->last_in_port].buf_len++] =
motu->in_ports[motu->last_in_port].last_cmd;
}
else
{
motu->in_ports[motu->last_in_port].last_cmd = buf[i];
}
motu->in_ports[motu->last_in_port].buf[motu->in_ports[motu->last_in_port].buf_len++] = buf[i];
switch(motu->in_ports[motu->last_in_port].last_cmd)
{
case 0xF5 :
motu->in_state = 1;
break;
case 0xF0 :
motu->in_state = 4; // special command
break;
default :
if(buf[i] < 0xF0)
motu->in_ports[motu->last_in_port].cmd_bytes_remaining = get_cmd_num_bytes(motu->in_ports[motu->last_in_port].last_cmd);
else
motu->in_ports[motu->last_in_port].cmd_bytes_remaining = 3;
motu->in_state = 3;
break;
}
}
break;
case 3 :
case 4 :
if(buf[i] != 0xFF)
{
motu->in_ports[motu->last_in_port].buf[motu->in_ports[motu->last_in_port].buf_len++] = buf[i];
if(((motu->in_state == 3) && (motu->in_ports[motu->last_in_port].buf_len == motu->in_ports[motu->last_in_port].cmd_bytes_remaining)) ||
((motu->in_state == 4) && (buf[i] == 0xF7)))
{
if(motu->in_ports[motu->last_in_port].substream)
{
midi_receive_substream = READ_ONCE(motu->in_ports[motu->last_in_port].substream);
if(midi_receive_substream != 0)
{
snd_rawmidi_receive(midi_receive_substream,motu->in_ports[motu->last_in_port].buf,motu->in_ports[motu->last_in_port].buf_len);
}
}
motu->in_ports[motu->last_in_port].buf_len = 0;
motu->in_state = 2;
}
}
break;
} /* switch */
i++;
}
} /* motu_midi_handle_input_prot2 */
static void motu_midi_send_prot1(struct motu *motu)
{
int ret, p, i, mask, bit;
struct snd_rawmidi_substream *midi_out_substream;
int lens[8];
unsigned char bufs[8][3];
int outlen = 2;
motu->midi_out_buf[0] = motu->counter++;
motu->midi_out_buf[1] = 0;
for(p = 0; p < motu->n_ports_out; p++) {
lens[p] = 0;
midi_out_substream = READ_ONCE(motu->out_ports[p].substream);
if (!midi_out_substream)
continue;
lens[p] = snd_rawmidi_transmit(midi_out_substream, bufs[p], 3);
if (lens[p] < 0)
dev_err(&motu->dev->dev, "%s: snd_rawmidi_transmit error %d\n", __func__, lens[p]);
}
for(i = 0; i < 3; i++) {
mask = 0;
for(p = 0, bit = 1; p < motu->n_ports_out; p++, bit <<= 1) {
if(lens[p] > i) mask |= bit;
}
if(mask == 0) {
motu->midi_out_active = 0;
break;
}
if(outlen < sizeof(motu->midi_out_buf) / sizeof(motu->midi_out_buf[0]))
motu->midi_out_buf[outlen++] = mask;
for(p = 0; p < motu->n_ports_out; p++) {
if(lens[p] > i && outlen < sizeof(motu->midi_out_buf) / sizeof(motu->midi_out_buf[0]))
motu->midi_out_buf[outlen++] = bufs[p][i];
}
}
if(outlen <= 2)
return;
if(outlen < sizeof(motu->midi_out_buf) / sizeof(motu->midi_out_buf[0]))
motu->midi_out_buf[outlen++] = 0;
if(outlen < sizeof(motu->midi_out_buf) / sizeof(motu->midi_out_buf[0]))
motu->midi_out_buf[outlen++] = 0;
/* set payload length */
motu->midi_out_urb->transfer_buffer_length = outlen;
motu_dump_buffer(PREFIX "sending to device: ", motu->midi_out_buf, outlen);
/* send packet to the MOTU */
ret = usb_submit_urb(motu->midi_out_urb, GFP_ATOMIC);
if (ret < 0)
dev_err(&motu->dev->dev, PREFIX
"%s (%p): usb_submit_urb() failed, ret=%d, outlen=%d\n",
__func__, midi_out_substream, ret, outlen);
else
motu->midi_out_active = 1;
}
static void mfifo_in(struct motu *motu,int port,unsigned char *buf,int len)
{
int i;
for(i=0; i<len; i++)
{
motu->mfifo[port].mbuf[motu->mfifo[port].p_in] = buf[i];
motu->mfifo[port].p_in++;
if(motu->mfifo[port].p_in >= N_MBUF)
motu->mfifo[port].p_in = 0;
motu->mfifo[port].buf_len++;
if(buf[i] & 0x80) // command
{
switch(buf[i])
{
case 0xF0 : // sysex command
motu->mfifo[port].cmd_len = 0;
break;
case 0xF7 : // end sysex
motu->mfifo[port].cmd_len = 0;
motu->mfifo[port].buf_send_len = motu->mfifo[port].buf_len;
break;
default :
motu->mfifo[port].cmd_len = get_cmd_num_bytes(buf[i]) - 1;
motu->mfifo[port].remaining = motu->mfifo[port].cmd_len;
break;
}
}
else if(motu->mfifo[port].cmd_len)
{
if(motu->mfifo[port].remaining == 0)
motu->mfifo[port].remaining = motu->mfifo[port].cmd_len;
motu->mfifo[port].remaining--;
if(motu->mfifo[port].remaining == 0)
{
motu->mfifo[port].buf_send_len = motu->mfifo[port].buf_len;
}
}
}
return;
} /* mfifo_in */
static void motu_midi_send_prot2(struct motu *motu)
{
int ret, p, i,j,k;
struct snd_rawmidi_substream *midi_out_substream;
int lens[9];
unsigned char bufs[9][12];
uint8_t state;
int out_count, out_offset;
for(p = 0; p < motu->n_ports_out; p++) {
lens[p] = 0;
midi_out_substream = READ_ONCE(motu->out_ports[p].substream);
if (!midi_out_substream)
continue;
lens[p] = snd_rawmidi_transmit(midi_out_substream, bufs[p], 3);
mfifo_in(motu,p,bufs[p],lens[p]);
if (lens[p] < 0)
dev_err(&motu->dev->dev, "%s: snd_rawmidi_transmit error %d\n", __func__, lens[p]);
}
i = 0;
state = 0;
k = 0;
for(p=0; p<motu->n_ports_out; p++)
{
while(motu->mfifo[p].buf_send_len)
{
if(p != motu->last_out_port)
{
if(k < 10) // dont split channel-change
{
motu->midi_out_buf[i++] = 0xF5;
motu->midi_out_buf[i++] = p;
k += 2;
motu->last_out_port = p;
if((motu->mfifo[p].mbuf[motu->mfifo[p].p_out] & 0x80) == 0)
{
motu->midi_out_buf[i++] = motu->mfifo[p].last_cmd;
k++;
}
}
else
{
while(k < 12)
{
motu->midi_out_buf[i++] = 0xFF;
k++;
}
}
}
else
{
if(motu->mfifo[p].mbuf[motu->mfifo[p].p_out] & 0x80)
motu->mfifo[p].last_cmd = motu->mfifo[p].mbuf[motu->mfifo[p].p_out];
motu->midi_out_buf[i++] =
motu->mfifo[p].mbuf[motu->mfifo[p].p_out];
motu->mfifo[p].p_out++;
if(motu->mfifo[p].p_out >= N_MBUF)
motu->mfifo[p].p_out = 0;
motu->mfifo[p].buf_len--;
motu->mfifo[p].buf_send_len--;
k++;
}
if(k == 12)
{
motu->midi_out_buf[i++] = 1;
motu->midi_out_buf[i++] = 0;
k = 0;
}
}
}
j = 0;
if(i)
{
if(k)
{
// fill rest
while(k < 12)
{
motu->midi_out_buf[i++] = 0xFF;
k++;
}
motu->midi_out_buf[i++] = 1;
motu->midi_out_buf[i++] = 0;
}
out_count = i;
out_offset = 0;
k = 0;
while(out_count > 0)
{
if(out_count > 14)
j = 14;
else
j = out_count;
if(k < NUM_ISO)
{
motu->midi_out_urb->iso_frame_desc[k].offset = out_offset;
motu->midi_out_urb->iso_frame_desc[k].length = j;
motu->midi_out_urb->iso_frame_desc[k].status = 0;
k++;
}
out_offset += j;
out_count -= j;
}
motu->midi_out_urb->number_of_packets = k;
motu_dump_buffer(PREFIX "sending to device : ", motu->midi_out_buf, i);
/* send packet to the MOTU */
ret = usb_submit_urb(motu->midi_out_urb, GFP_ATOMIC);
if (ret < 0)
dev_err(&motu->dev->dev, PREFIX
"%s (%p): usb_submit_urb() failed, ret=%d, outlen=%d\n",
__func__, midi_out_substream, ret, i);
else
motu->midi_out_active = 1;
}
} /* motu_midi_send_prot2 */
static int motu_midi_output_open(struct snd_rawmidi_substream *substream)
{
return 0;
}
static int motu_midi_output_close(struct snd_rawmidi_substream *substream)
{
struct motu *motu = substream->rmidi->private_data;
if (motu->midi_out_active) {
usb_kill_urb(motu->midi_out_urb);
motu->midi_out_active = 0;
}
return 0;
}
/* (de)register midi substream from client */
static void motu_midi_output_trigger(struct snd_rawmidi_substream *substream,
int up)
{
struct motu *motu;
unsigned long flags;
if(substream == NULL)
return;
if(substream->rmidi == NULL)
return;
if(substream->rmidi->private_data == NULL)
return;
motu = substream->rmidi->private_data;
spin_lock_irqsave(&motu->spinlock,flags);
if (up) {
motu->out_ports[substream->number].substream = substream;
/* check if there is data userspace wants to send */
if (!motu->midi_out_active)
{
switch(motu->motu_type)
{
case express_128 :
case micro_lite :
motu_midi_send_prot1(motu);
break;
case micro_express :
case express_xt :
motu_midi_send_prot2(motu);
break;
}
}
} else {
motu->out_ports[substream->number].substream = NULL;
}
spin_unlock_irqrestore(&motu->spinlock,flags);
}
static void motu_output_complete(struct urb *urb)
{
struct motu *motu;
unsigned long flags;
if (urb->status)
dev_warn(&urb->dev->dev,
PREFIX "output urb->status: %d\n", urb->status);
if (urb->status == -ESHUTDOWN)
return;
motu = urb->context;
spin_lock_irqsave(&motu->spinlock,flags);
motu->midi_out_active = 0;
/* check if there is more data userspace wants to send */
switch(motu->motu_type)
{
case express_128 :
case micro_lite :
motu_midi_send_prot1(motu);
break;
case micro_express :
case express_xt :
motu_midi_send_prot2(motu);
break;
}
spin_unlock_irqrestore(&motu->spinlock,flags);
}
static void motu_input_complete(struct urb *urb)
{
int ret;
struct motu *motu = urb->context;
if (urb->status)
dev_warn(&urb->dev->dev,
PREFIX "input urb->status: %i\n", urb->status);
if (!motu || urb->status == -ESHUTDOWN)
return;
if (urb->actual_length > 0) {
switch(motu->motu_type)
{
case express_128 :
case micro_lite :
motu_midi_handle_input_prot1(motu, urb->transfer_buffer, urb->actual_length);
break;
case micro_express :
case express_xt :
motu_midi_handle_input_prot2(motu, urb->transfer_buffer, urb->actual_length);
break;
}
}
/* return URB to device */
ret = usb_submit_urb(motu->midi_in_urb, GFP_ATOMIC);
if (ret < 0)
dev_err(&motu->dev->dev, PREFIX
"%s: usb_submit_urb() failed, ret=%d\n",
__func__, ret);
}
static const struct snd_rawmidi_ops motu_midi_output = {
.open = motu_midi_output_open,
.close = motu_midi_output_close,
.trigger = motu_midi_output_trigger,
};
static const struct snd_rawmidi_ops motu_midi_input = {
.open = motu_midi_input_open,
.close = motu_midi_input_close,
.trigger = motu_midi_input_trigger,
};
static void motu_init_device(struct motu *motu) {
int ret;
init_usb_anchor(&motu->anchor);
usb_anchor_urb(motu->midi_out_urb, &motu->anchor);
usb_anchor_urb(motu->midi_in_urb, &motu->anchor);
motu->midi_out_active = 0;
/* pass URB to device to enable button and controller events */
ret = usb_submit_urb(motu->midi_in_urb, GFP_KERNEL);
if (ret < 0)
dev_err(&motu->dev->dev, PREFIX
"%s: usb_submit_urb() in failed, ret=%d: ",
__func__, ret);
/* ensure initialization is finished */
usb_wait_anchor_empty_timeout(&motu->anchor, 1000);
}
static int motu_init_midi(struct motu *motu)
{
int ret;
struct snd_rawmidi *rmidi;
ret = snd_rawmidi_new(
motu->card,
motu->card->shortname,
0,
motu->n_ports_out, /* output */
motu->n_ports_in, /* input */
&rmidi
);
if (ret < 0)
return ret;
strncpy(rmidi->name, motu->card->shortname, sizeof(rmidi->name));
rmidi->info_flags = SNDRV_RAWMIDI_INFO_DUPLEX;
rmidi->private_data = motu;
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT;
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &motu_midi_output);
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT;
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &motu_midi_input);
motu->rmidi = rmidi;
usb_set_interface(motu->dev, 1, 2);
motu->midi_in_urb = usb_alloc_urb(0, GFP_KERNEL);
switch(motu->motu_type)
{
case express_128 :
case micro_lite :
motu->midi_out_urb = usb_alloc_urb(0, GFP_KERNEL);
break;
case micro_express :
case express_xt :
motu->midi_out_urb = usb_alloc_urb(NUM_ISO, GFP_KERNEL);
break;
}
if (!motu->midi_in_urb || !motu->midi_out_urb) {
dev_err(&motu->dev->dev, PREFIX "usb_alloc_urb failed\n");
return -ENOMEM;
}
usb_fill_int_urb(motu->midi_in_urb, motu->dev,
usb_rcvintpipe(motu->dev, 0x81),
motu->midi_in_buf, BUFSIZE,
motu_input_complete, motu, 1);
if((motu->motu_type == express_128) || (motu->motu_type == micro_lite))
{
usb_fill_int_urb(motu->midi_out_urb, motu->dev,
usb_sndintpipe(motu->dev, 0x02),
motu->midi_out_buf, BUFSIZE,
motu_output_complete, motu, 1);
}
else if((motu->motu_type == micro_express) || (motu->motu_type == express_xt))
{
motu->midi_out_urb->dev = motu->dev;
motu->midi_out_urb->pipe = usb_sndisocpipe(motu->dev,0x02);
motu->midi_out_urb->transfer_flags = URB_ISO_ASAP;
motu->midi_out_urb->transfer_buffer = motu->midi_out_buf;
motu->midi_out_urb->transfer_buffer_length = BUFSIZE;
motu->midi_out_urb->complete = motu_output_complete;
motu->midi_out_urb->context = motu;
motu->midi_out_urb->start_frame = 0;
motu->midi_out_urb->number_of_packets = 1;
motu->midi_out_urb->iso_frame_desc[0].offset = 0;
motu->midi_out_urb->iso_frame_desc[0].length = BUFSIZE;
motu->midi_out_urb->interval = 1;
}
#if LINUX_VERSION_CODE >= KERNEL_VERSION(5,0,0)
/* sanity checks of EPs before actually submitting */
if (usb_urb_ep_type_check(motu->midi_in_urb) ||
usb_urb_ep_type_check(motu->midi_out_urb)) {
dev_err(&motu->dev->dev, "invalid MIDI EP\n");
return -EINVAL;
}
#endif
motu_init_device(motu);
return 0;
}
static void motu_free_usb_related_resources(struct motu *motu,
struct usb_interface *interface)
{
/* usb_kill_urb not necessary, urb is aborted automatically */
usb_free_urb(motu->midi_out_urb);
usb_free_urb(motu->midi_in_urb);
if (motu->intf) {
usb_set_intfdata(motu->intf, NULL);
motu->intf = NULL;
}
}
static int motu_probe(struct usb_interface *interface,
const struct usb_device_id *usb_id)
{
struct snd_card *card;
struct motu *motu;
unsigned int card_index;
char usb_path[32];
int err, i;
struct usb_device *usbdev;
char str[64];
mutex_lock(&devices_mutex);
for (card_index = 0; card_index < SNDRV_CARDS; ++card_index)
if (!test_bit(card_index, devices_used))
break;
if (card_index >= SNDRV_CARDS) {
mutex_unlock(&devices_mutex);
return -ENOENT;
}
usbdev = interface_to_usbdev(interface);
if(usb_string(usbdev,usbdev->descriptor.iProduct,str,sizeof(str)) <= 0)
{
mutex_unlock(&devices_mutex);
return -ENODEV;
}
if((interface->altsetting->desc.bInterfaceNumber != 1) ||
((usbdev->descriptor.bDeviceSubClass != 3) &&
(usbdev->descriptor.bDeviceSubClass != 1))) {
mutex_unlock(&devices_mutex);
return -ENOENT;
}
err = snd_card_new(&interface->dev, index[card_index], id[card_index],
THIS_MODULE, sizeof(*motu), &card);
if (err < 0) {
mutex_unlock(&devices_mutex);
return err;
}
motu = card->private_data;
motu->dev = usbdev;
motu->card = card;
motu->card_index = card_index;
motu->intf = interface;
// check iProduct doesn't help: micro lite is 2; micro express also
switch(usbdev->descriptor.bDeviceSubClass)
{
case 1 : // micro express
if(usbdev->actconfig->desc.bConfigurationValue != 1)
{
usb_driver_set_configuration(usbdev,1);
return -ENODEV;
}
usb_set_interface(usbdev,0,0);
if(strstr(str,"Micro Express"))
{
motu->motu_type = micro_express;
motu->n_ports_in = 5; // 0 is dead for the moment
motu->n_ports_out = 7; // 0 is all
motu->last_out_port = -1;
motu->last_in_port = -1;
motu->in_state = 0;
}
else
{
motu->motu_type = express_xt;
motu->n_ports_in = 9; // 0 is dead for the moment
motu->n_ports_out = 9; // 0 is all
motu->last_out_port = -1;
motu->last_in_port = -1;
motu->in_state = 0;
}
break;
case 3 : // express 128
if(strstr(str,"micro lite"))
{
motu->motu_type = micro_lite;
motu->n_ports_in = 5;
motu->n_ports_out = 5;
}
else
{
motu->motu_type = express_128;
motu->n_ports_in = 8;
motu->n_ports_out = 8;
}
break;
default :
mutex_unlock(&devices_mutex);
return -ENODEV;
break;
}
spin_lock_init(&motu->spinlock);
// Do I need to initialize this to zero? Or is it already zeroed by snd_card_new()?
for(i = 0; i < 9; i++) {
motu->in_ports[i].substream = 0;
motu->in_ports[i].last_cmd = 0;
motu->in_ports[i].cmd_bytes_remaining = 0;
motu->out_ports[i].substream = 0;
}
snd_card_set_dev(card, &interface->dev);
strncpy(card->driver, "snd-motu", sizeof(card->driver));
snprintf(card->shortname, sizeof(card->shortname), "MOTU %s", str);
usb_make_path(motu->dev, usb_path, sizeof(usb_path));
snprintf(motu->card->longname, sizeof(motu->card->longname),
"MOTU midi %s at %s",str,usb_path);
err = motu_init_midi(motu);
if (err < 0)
goto probe_error;
err = snd_card_register(card);
if (err < 0)
goto probe_error;
usb_set_intfdata(interface, motu);
set_bit(card_index, devices_used);
mutex_unlock(&devices_mutex);
return 0;
probe_error:
dev_info(&motu->dev->dev, PREFIX "error during probing");
motu_free_usb_related_resources(motu, interface);
snd_card_free(card);