- 根目录:
- drivers
- usb
- gadget
- f_midi.c
/*
* f_midi.c -- USB MIDI class function driver
*
* Copyright (C) 2006 Thumtronics Pty Ltd.
* Developed for Thumtronics by Grey Innovation
* Ben Williamson <ben.williamson@greyinnovation.com>
*
* Rewritten for the composite framework
* Copyright (C) 2011 Daniel Mack <zonque@gmail.com>
*
* Based on drivers/usb/gadget/f_audio.c,
* Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
* Copyright (C) 2008 Analog Devices, Inc
*
* and drivers/usb/gadget/midi.c,
* Copyright (C) 2006 Thumtronics Pty Ltd.
* Ben Williamson <ben.williamson@greyinnovation.com>
*
* Licensed under the GPL-2 or later.
*/
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/rawmidi.h>
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
#include <linux/usb/audio.h>
#include <linux/usb/midi.h>
MODULE_AUTHOR("Ben Williamson");
MODULE_LICENSE("GPL v2");
static const char f_midi_shortname[] = "f_midi";
static const char f_midi_longname[] = "MIDI Gadget";
/*
* We can only handle 16 cables on one single endpoint, as cable numbers are
* stored in 4-bit fields. And as the interface currently only holds one
* single endpoint, this is the maximum number of ports we can allow.
*/
#define MAX_PORTS 16
/*
* This is a gadget, and the IN/OUT naming is from the host's perspective.
* USB -> OUT endpoint -> rawmidi
* USB <- IN endpoint <- rawmidi
*/
struct gmidi_in_port {
struct f_midi *midi;
int active;
uint8_t cable;
uint8_t state;
#define STATE_UNKNOWN 0
#define STATE_1PARAM 1
#define STATE_2PARAM_1 2
#define STATE_2PARAM_2 3
#define STATE_SYSEX_0 4
#define STATE_SYSEX_1 5
#define STATE_SYSEX_2 6
uint8_t data[2];
};
struct midi_alsa_config {
int card;
int device;
};
struct f_midi {
struct usb_function func;
struct usb_gadget *gadget;
struct usb_ep *in_ep, *out_ep;
struct snd_card *card;
struct snd_rawmidi *rmidi;
struct snd_rawmidi_substream *in_substream[MAX_PORTS];
struct snd_rawmidi_substream *out_substream[MAX_PORTS];
struct gmidi_in_port *in_port[MAX_PORTS];
unsigned long out_triggered;
struct tasklet_struct tasklet;
unsigned int in_ports;
unsigned int out_ports;
int index;
char *id;
unsigned int buflen, qlen;
};
static inline struct f_midi *func_to_midi(struct usb_function *f)
{
return container_of(f, struct f_midi, func);
}
static void f_midi_transmit(struct f_midi *midi, struct usb_request *req);
DECLARE_UAC_AC_HEADER_DESCRIPTOR(1);
DECLARE_USB_MIDI_OUT_JACK_DESCRIPTOR(1);
DECLARE_USB_MS_ENDPOINT_DESCRIPTOR(16);
/* B.3.1 Standard AC Interface Descriptor */
static struct usb_interface_descriptor ac_interface_desc /* __initdata */ = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
/* .bInterfaceNumber = DYNAMIC */
/* .bNumEndpoints = DYNAMIC */
.bInterfaceClass = USB_CLASS_AUDIO,
.bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
/* .iInterface = DYNAMIC */
};
/* B.3.2 Class-Specific AC Interface Descriptor */
static struct uac1_ac_header_descriptor_1 ac_header_desc /* __initdata */ = {
.bLength = UAC_DT_AC_HEADER_SIZE(1),
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = USB_MS_HEADER,
.bcdADC = cpu_to_le16(0x0100),
.wTotalLength = cpu_to_le16(UAC_DT_AC_HEADER_SIZE(1)),
.bInCollection = 1,
/* .baInterfaceNr = DYNAMIC */
};
/* B.4.1 Standard MS Interface Descriptor */
static struct usb_interface_descriptor ms_interface_desc /* __initdata */ = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
/* .bInterfaceNumber = DYNAMIC */
.bNumEndpoints = 2,
.bInterfaceClass = USB_CLASS_AUDIO,
.bInterfaceSubClass = USB_SUBCLASS_MIDISTREAMING,
/* .iInterface = DYNAMIC */
};
/* B.4.2 Class-Specific MS Interface Descriptor */
static struct usb_ms_header_descriptor ms_header_desc /* __initdata */ = {
.bLength = USB_DT_MS_HEADER_SIZE,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = USB_MS_HEADER,
.bcdMSC = cpu_to_le16(0x0100),
/* .wTotalLength = DYNAMIC */
};
/* B.5.1 Standard Bulk OUT Endpoint Descriptor */
static struct usb_endpoint_descriptor bulk_out_desc = {
.bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
/* B.5.2 Class-specific MS Bulk OUT Endpoint Descriptor */
static struct usb_ms_endpoint_descriptor_16 ms_out_desc = {
/* .bLength = DYNAMIC */
.bDescriptorType = USB_DT_CS_ENDPOINT,
.bDescriptorSubtype = USB_MS_GENERAL,
/* .bNumEmbMIDIJack = DYNAMIC */
/* .baAssocJackID = DYNAMIC */
};
/* B.6.1 Standard Bulk IN Endpoint Descriptor */
static struct usb_endpoint_descriptor bulk_in_desc = {
.bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN,
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
/* B.6.2 Class-specific MS Bulk IN Endpoint Descriptor */
static struct usb_ms_endpoint_descriptor_16 ms_in_desc = {
/* .bLength = DYNAMIC */
.bDescriptorType = USB_DT_CS_ENDPOINT,
.bDescriptorSubtype = USB_MS_GENERAL,
/* .bNumEmbMIDIJack = DYNAMIC */
/* .baAssocJackID = DYNAMIC */
};
/* string IDs are assigned dynamically */
#define STRING_FUNC_IDX 0
static struct usb_string midi_string_defs[] = {
[STRING_FUNC_IDX].s = "MIDI function",
{ } /* end of list */
};
static struct usb_gadget_strings midi_stringtab = {
.language = 0x0409, /* en-us */
.strings = midi_string_defs,
};
static struct usb_gadget_strings *midi_strings[] = {
&midi_stringtab,
NULL,
};
static struct usb_request *midi_alloc_ep_req(struct usb_ep *ep, unsigned length)
{
struct usb_request *req;
req = usb_ep_alloc_request(ep, GFP_ATOMIC);
if (req) {
req->length = length;
req->buf = kmalloc(length, GFP_ATOMIC);
if (!req->buf) {
usb_ep_free_request(ep, req);
req = NULL;
}
}
return req;
}
static void midi_free_ep_req(struct usb_ep *ep, struct usb_request *req)
{
kfree(req->buf);
usb_ep_free_request(ep, req);
}
static const uint8_t f_midi_cin_length[] = {
0, 0, 2, 3, 3, 1, 2, 3, 3, 3, 3, 3, 2, 2, 3, 1
};
/*
* Receives a chunk of MIDI data.
*/
static void f_midi_read_data(struct usb_ep *ep, int cable,
uint8_t *data, int length)
{
struct f_midi *midi = ep->driver_data;
struct snd_rawmidi_substream *substream = midi->out_substream[cable];
if (!substream)
/* Nobody is listening - throw it on the floor. */
return;
if (!test_bit(cable, &midi->out_triggered))
return;
snd_rawmidi_receive(substream, data, length);
}
static void f_midi_handle_out_data(struct usb_ep *ep, struct usb_request *req)
{
unsigned int i;
u8 *buf = req->buf;
for (i = 0; i + 3 < req->actual; i += 4)
if (buf[i] != 0) {
int cable = buf[i] >> 4;
int length = f_midi_cin_length[buf[i] & 0x0f];
f_midi_read_data(ep, cable, &buf[i + 1], length);
}
}
static void
f_midi_complete(struct usb_ep *ep, struct usb_request *req)
{
struct f_midi *midi = ep->driver_data;
struct usb_composite_dev *cdev = midi->func.config->cdev;
int status = req->status;
switch (status) {
case 0: /* normal completion */
if (ep == midi->out_ep) {
/* We received stuff. req is queued again, below */
f_midi_handle_out_data(ep, req);
} else if (ep == midi->in_ep) {
/* Our transmit completed. See if there's more to go.
* f_midi_transmit eats req, don't queue it again. */
f_midi_transmit(midi, req);
return;
}
break;
/* this endpoint is normally active while we're configured */
case -ECONNABORTED: /* hardware forced ep reset */
case -ECONNRESET: /* request dequeued */
case -ESHUTDOWN: /* disconnect from host */
VDBG(cdev, "%s gone (%d), %d/%d\n", ep->name, status,
req->actual, req->length);
if (ep == midi->out_ep)
f_midi_handle_out_data(ep, req);
midi_free_ep_req(ep, req);
return;
case -EOVERFLOW: /* buffer overrun on read means that
* we didn't provide a big enough buffer.
*/
default:
DBG(cdev, "%s complete --> %d, %d/%d\n", ep->name,
status, req->actual, req->length);
break;
case -EREMOTEIO: /* short read */
break;
}
status = usb_ep_queue(ep, req, GFP_ATOMIC);
if (status) {
ERROR(cdev, "kill %s: resubmit %d bytes --> %d\n",
ep->name, req->length, status);
usb_ep_set_halt(ep);
/* FIXME recover later ... somehow */
}
}
static int f_midi_start_ep(struct f_midi *midi,
struct usb_function *f,
struct usb_ep *ep)
{
int err;
struct usb_composite_dev *cdev = f->config->cdev;
if (ep->driver_data)
usb_ep_disable(ep);
err = config_ep_by_speed(midi->gadget, f, ep);
if (err) {
ERROR(cdev, "can't configure %s: %d\n", ep->name, err);
return err;
}
err = usb_ep_enable(ep);
if (err) {
ERROR(cdev, "can't start %s: %d\n", ep->name, err);
return err;
}
ep->driver_data = midi;
return 0;
}
static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
{
struct f_midi *midi = func_to_midi(f);
struct usb_composite_dev *cdev = f->config->cdev;
unsigned i;
int err;
err = f_midi_start_ep(midi, f, midi->in_ep);
if (err)
return err;
err = f_midi_start_ep(midi, f, midi->out_ep);
if (err)
return err;
if (midi->out_ep->driver_data)
usb_ep_disable(midi->out_ep);
err = config_ep_by_speed(midi->gadget, f, midi->out_ep);
if (err) {
ERROR(cdev, "can't configure %s: %d\n",
midi->out_ep->name, err);
return err;
}
err = usb_ep_enable(midi->out_ep);
if (err) {
ERROR(cdev, "can't start %s: %d\n",
midi->out_ep->name, err);
return err;
}
midi->out_ep->driver_data = midi;
/* allocate a bunch of read buffers and queue them all at once. */
for (i = 0; i < midi->qlen && err == 0; i++) {
struct usb_request *req =
midi_alloc_ep_req(midi->out_ep, midi->buflen);
if (req == NULL)
return -ENOMEM;
req->complete = f_midi_complete;
err = usb_ep_queue(midi->out_ep, req, GFP_ATOMIC);
if (err) {
ERROR(midi, "%s queue req: %d\n",
midi->out_ep->name, err);
}
}
return 0;
}
static void f_midi_disable(struct usb_function *f)
{
struct f_midi *midi = func_to_midi(f);
struct usb_composite_dev *cdev = f->config->cdev;
DBG(cdev, "disable\n");
/*
* just disable endpoints, forcing completion of pending i/o.
* all our completion handlers free their requests in this case.
*/
usb_ep_disable(midi->in_ep);
usb_ep_disable(midi->out_ep);
}
static void f_midi_unbind(struct usb_configuration *c, struct usb_function *f)
{
struct usb_composite_dev *cdev = f->config->cdev;
struct f_midi *midi = func_to_midi(f);
struct snd_card *card;
DBG(cdev, "unbind\n");
/* just to be sure */
f_midi_disable(f);
card = midi->card;
midi->card = NULL;
if (card)
snd_card_free_when_closed(card);
kfree(midi->id);
midi->id = NULL;
usb_free_all_descriptors(f);
kfree(midi);
}
static int f_midi_snd_free(struct snd_device *device)
{
return 0;
}
static void f_midi_transmit_packet(struct usb_request *req, uint8_t p0,
uint8_t p1, uint8_t p2, uint8_t p3)
{
unsigned length = req->length;
u8 *buf = (u8 *)req->buf + length;
buf[0] = p0;
buf[1] = p1;
buf[2] = p2;
buf[3] = p3;
req->length = length + 4;
}
/*
* Converts MIDI commands to USB MIDI packets.
*/
static void f_midi_transmit_byte(struct usb_request *req,
struct gmidi_in_port *port, uint8_t b)
{
uint8_t p0 = port->cable << 4;
if (b >= 0xf8) {
f_midi_transmit_packet(req, p0 | 0x0f, b, 0, 0);
} else if (b >= 0xf0) {
switch (b) {
case 0xf0:
port->data[0] = b;
port->state = STATE_SYSEX_1;
break;
case 0xf1:
case 0xf3:
port->data[0] = b;
port->state = STATE_1PARAM;
break;
case 0xf2:
port->data[0] = b;
port->state = STATE_2PARAM_1;
break;
case 0xf4:
case 0xf5:
port->state = STATE_UNKNOWN;
break;
case 0xf6:
f_midi_transmit_packet(req, p0 | 0x05, 0xf6, 0, 0);
port->state = STATE_UNKNOWN;
break;
case 0xf7:
switch (port->state) {
case STATE_SYSEX_0:
f_midi_transmit_packet(req,
p0 | 0x05, 0xf7, 0, 0);
break;
case STATE_SYSEX_1:
f_midi_transmit_packet(req,
p0 | 0x06, port->data[0], 0xf7, 0);
break;
case STATE_SYSEX_2:
f_midi_transmit_packet(req,
p0 | 0x07, port->data[0],
port->data[1], 0xf7);
break;
}
port->state = STATE_UNKNOWN;
break;
}
} else if (b >= 0x80) {
port->data[0] = b;
if (b >= 0xc0 && b <= 0xdf)
port->state = STATE_1PARAM;
else
port->state = STATE_2PARAM_1;
} else { /* b < 0x80 */
switch (port->state) {
case STATE_1PARAM:
if (port->data[0] < 0xf0) {
p0 |= port->data[0] >> 4;
} else {
p0 |= 0x02;
port->state = STATE_UNKNOWN;
}
f_midi_transmit_packet(req, p0, port->data[0], b, 0);
break;
case STATE_2PARAM_1:
port->data[1] = b;
port->state = STATE_2PARAM_2;
break;
case STATE_2PARAM_2:
if (port->data[0] < 0xf0) {
p0 |= port->data[0] >> 4;
port->state = STATE_2PARAM_1;
} else {
p0 |= 0x03;
port->state = STATE_UNKNOWN;
}
f_midi_transmit_packet(req,
p0, port->data[0], port->data[1], b);
break;
case STATE_SYSEX_0:
port->data[0] = b;
port->state = STATE_SYSEX_1;
break;
case STATE_SYSEX_1:
port->data[1] = b;
port->state = STATE_SYSEX_2;
break;
case STATE_SYSEX_2:
f_midi_transmit_packet(req,
p0 | 0x04, port->data[0], port->data[1], b);
port->state = STATE_SYSEX_0;
break;
}
}
}
static void f_midi_transmit(struct f_midi *midi, struct usb_request *req)
{
struct usb_ep *ep = midi->in_ep;
int i;
if (!ep)
return;
if (!req)
req = midi_alloc_ep_req(ep, midi->buflen);
if (!req) {
ERROR(midi, "gmidi_transmit: midi_alloc_ep_request failed\n");
return;
}
req->length = 0;
req->complete = f_midi_complete;
for (i = 0; i < MAX_PORTS; i++) {
struct gmidi_in_port *port = midi->in_port[i];
struct snd_rawmidi_substream *substream = midi->in_substream[i];
if (!port || !port->active || !substream)
continue;
while (req->length + 3 < midi->buflen) {
uint8_t b;
if (snd_rawmidi_transmit(substream, &b, 1) != 1) {
port->active = 0;
break;
}
f_midi_transmit_byte(req, port, b);
}
}
if (req->length > 0)
usb_ep_queue(ep, req, GFP_ATOMIC);
else
midi_free_ep_req(ep, req);
}
static void f_midi_in_tasklet(unsigned long data)
{
struct f_midi *midi = (struct f_midi *) data;
f_midi_transmit(midi, NULL);
}
static int f_midi_in_open(struct snd_rawmidi_substream *substream)
{
struct f_midi *midi = substream->rmidi->private_data;
if (!midi->in_port[substream->number])
return -EINVAL;
VDBG(midi, "%s()\n", __func__);
midi->in_substream[substream->number] = substream;
midi->in_port[substream->number]->state = STATE_UNKNOWN;
return 0;
}
static int f_midi_in_close(struct snd_rawmidi_substream *substream)
{
struct f_midi *midi = substream->rmidi->private_data;
VDBG(midi, "%s()\n", __func__);
return 0;
}
static void f_midi_in_trigger(struct snd_rawmidi_substream *substream, int up)
{
struct f_midi *midi = substream->rmidi->private_data;
if (!midi->in_port[substream->number])
return;
VDBG(midi, "%s() %d\n", __func__, up);
midi->in_port[substream->number]->active = up;
if (up)
tasklet_hi_schedule(&midi->tasklet);
}
static int f_midi_out_open(struct snd_rawmidi_substream *substream)
{
struct f_midi *midi = substream->rmidi->private_data;
if (substream->number >= MAX_PORTS)
return -EINVAL;
VDBG(midi, "%s()\n", __func__);
midi->out_substream[substream->number] = substream;
return 0;
}
static int f_midi_out_close(struct snd_rawmidi_substream *substream)
{
struct f_midi *midi = substream->rmidi->private_data;
VDBG(midi, "%s()\n", __func__);
return 0;
}
static void f_midi_out_trigger(struct snd_rawmidi_substream *substream, int up)
{
struct f_midi *midi = substream->rmidi->private_data;
VDBG(midi, "%s()\n", __func__);
if (up)
set_bit(substream->number, &midi->out_triggered);
else
clear_bit(substream->number, &midi->out_triggered);
}
static struct snd_rawmidi_ops gmidi_in_ops = {
.open = f_midi_in_open,
.close = f_midi_in_close,
.trigger = f_midi_in_trigger,
};
static struct snd_rawmidi_ops gmidi_out_ops = {
.open = f_midi_out_open,
.close = f_midi_out_close,
.trigger = f_midi_out_trigger
};
/* register as a sound "card" */
static int f_midi_register_card(struct f_midi *midi)
{
struct snd_card *card;
struct snd_rawmidi *rmidi;
int err;
static struct snd_device_ops ops = {
.dev_free = f_midi_snd_free,
};
err = snd_card_create(midi->index, midi->id, THIS_MODULE, 0, &card);
if (err < 0) {
ERROR(midi, "snd_card_create() failed\n");
goto fail;
}
midi->card = card;
err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, midi, &ops);
if (err < 0) {
ERROR(midi, "snd_device_new() failed: error %d\n", err);
goto fail;
}
strcpy(card->driver, f_midi_longname);
strcpy(card->longname, f_midi_longname);
strcpy(card->shortname, f_midi_shortname);
/* Set up rawmidi */
snd_component_add(card, "MIDI");
err = snd_rawmidi_new(card, card->longname, 0,
midi->out_ports, midi->in_ports, &rmidi);
if (err < 0) {
ERROR(midi, "snd_rawmidi_new() failed: error %d\n", err);
goto fail;
}
midi->rmidi = rmidi;
strcpy(rmidi->name, card->shortname);
rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
SNDRV_RAWMIDI_INFO_INPUT |
SNDRV_RAWMIDI_INFO_DUPLEX;
rmidi->private_data = midi;
/*
* Yes, rawmidi OUTPUT = USB IN, and rawmidi INPUT = USB OUT.
* It's an upside-down world being a gadget.
*/
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &gmidi_in_ops);
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &gmidi_out_ops);
snd_card_set_dev(card, &midi->gadget->dev);
/* register it - we're ready to go */
err = snd_card_register(card);
if (err < 0) {
ERROR(midi, "snd_card_register() failed\n");
goto fail;
}
VDBG(midi, "%s() finished ok\n", __func__);
return 0;
fail:
if (midi->card) {
snd_card_free(midi->card);
midi->card = NULL;
}
return err;
}
/* MIDI function driver setup/binding */
static int /* __init */
f_midi_bind(struct usb_configuration *c, struct usb_function *f)
{
struct usb_descriptor_header **midi_function;
struct usb_midi_in_jack_descriptor jack_in_ext_desc[MAX_PORTS];
struct usb_midi_in_jack_descriptor jack_in_emb_desc[MAX_PORTS];
struct usb_midi_out_jack_descriptor_1 jack_out_ext_desc[MAX_PORTS];
struct usb_midi_out_jack_descriptor_1 jack_out_emb_desc[MAX_PORTS];
struct usb_composite_dev *cdev = c->cdev;
struct f_midi *midi = func_to_midi(f);
int status, n, jack = 1, i = 0;
/* maybe allocate device-global string ID */
if (midi_string_defs[0].id == 0) {
status = usb_string_id(c->cdev);
if (status < 0)
goto fail;
midi_string_defs[0].id = status;
}
/* We have two interfaces, AudioControl and MIDIStreaming */
status = usb_interface_id(c, f);
if (status < 0)
goto fail;
ac_interface_desc.bInterfaceNumber = status;
status = usb_interface_id(c, f);
if (status < 0)
goto fail;
ms_interface_desc.bInterfaceNumber = status;
ac_header_desc.baInterfaceNr[0] = status;
status = -ENODEV;
/* allocate instance-specific endpoints */
midi->in_ep = usb_ep_autoconfig(cdev->gadget, &bulk_in_desc);
if (!midi->in_ep)
goto fail;
midi->in_ep->driver_data = cdev; /* claim */
midi->out_ep = usb_ep_autoconfig(cdev->gadget, &bulk_out_desc);
if (!midi->out_ep)
goto fail;
midi->out_ep->driver_data = cdev; /* claim */
/* allocate temporary function list */
midi_function = kcalloc((MAX_PORTS * 4) + 9, sizeof(*midi_function),
GFP_KERNEL);
if (!midi_function) {
status = -ENOMEM;
goto fail;
}
/*
* construct the function's descriptor set. As the number of
* input and output MIDI ports is configurable, we have to do
* it that way.
*/
/* add the headers - these are always the same */
midi_function[i++] = (struct usb_descriptor_header *) &ac_interface_desc;
midi_function[i++] = (struct usb_descriptor_header *) &ac_header_desc;
midi_function[i++] = (struct usb_descriptor_header *) &ms_interface_desc;
/* calculate the header's wTotalLength */
n = USB_DT_MS_HEADER_SIZE
+ (midi->in_ports + midi->out_ports) *
(USB_DT_MIDI_IN_SIZE + USB_DT_MIDI_OUT_SIZE(1));
ms_header_desc.wTotalLength = cpu_to_le16(n);
midi_function[i++] = (struct usb_descriptor_header *) &ms_header_desc;
/* configure the external IN jacks, each linked to an embedded OUT jack */
for (n = 0; n < midi->in_ports; n++) {
struct usb_midi_in_jack_descriptor *in_ext = &jack_in_ext_desc[n];
struct usb_midi_out_jack_descriptor_1 *out_emb = &jack_out_emb_desc[n];
in_ext->bLength = USB_DT_MIDI_IN_SIZE;
in_ext->bDescriptorType = USB_DT_CS_INTERFACE;
in_ext->bDescriptorSubtype = USB_MS_MIDI_IN_JACK;
in_ext->bJackType = USB_MS_EXTERNAL;
in_ext->bJackID = jack++;
in_ext->iJack = 0;
midi_function[i++] = (struct usb_descriptor_header *) in_ext;
out_emb->bLength = USB_DT_MIDI_OUT_SIZE(1);
out_emb->bDescriptorType = USB_DT_CS_INTERFACE;
out_emb->bDescriptorSubtype = USB_MS_MIDI_OUT_JACK;
out_emb->bJackType = USB_MS_EMBEDDED;
out_emb->bJackID = jack++;
out_emb->bNrInputPins = 1;
out_emb->pins[0].baSourcePin = 1;
out_emb->pins[0].baSourceID = in_ext->bJackID;
out_emb->iJack = 0;
midi_function[i++] = (struct usb_descriptor_header *) out_emb;
/* link it to the endpoint */
ms_in_desc.baAssocJackID[n] = out_emb->bJackID;
}
/* configure the external OUT jacks, each linked to an embedded IN jack */
for (n = 0; n < midi->out_ports; n++) {
struct usb_midi_in_jack_descriptor *in_emb = &jack_in_emb_desc[n];
struct usb_midi_out_jack_descriptor_1 *out_ext = &jack_out_ext_desc[n];
in_emb->bLength = USB_DT_MIDI_IN_SIZE;
in_emb->bDescriptorType = USB_DT_CS_INTERFACE;
in_emb->bDescriptorSubtype = USB_MS_MIDI_IN_JACK;
in_emb->bJackType = USB_MS_EMBEDDED;
in_emb->bJackID = jack++;
in_emb->iJack = 0;
midi_function[i++] = (struct usb_descriptor_header *) in_emb;
out_ext->bLength = USB_DT_MIDI_OUT_SIZE(1);
out_ext->bDescriptorType = USB_DT_CS_INTERFACE;
out_ext->bDescriptorSubtype = USB_MS_MIDI_OUT_JACK;
out_ext->bJackType = USB_MS_EXTERNAL;
out_ext->bJackID = jack++;
out_ext->bNrInputPins = 1;
out_ext->iJack = 0;
out_ext->pins[0].baSourceID = in_emb->bJackID;
out_ext->pins[0].baSourcePin = 1;
midi_function[i++] = (struct usb_descriptor_header *) out_ext;
/* link it to the endpoint */
ms_out_desc.baAssocJackID[n] = in_emb->bJackID;
}
/* configure the endpoint descriptors ... */
ms_out_desc.bLength = USB_DT_MS_ENDPOINT_SIZE(midi->in_ports);
ms_out_desc.bNumEmbMIDIJack = midi->in_ports;
ms_in_desc.bLength = USB_DT_MS_ENDPOINT_SIZE(midi->out_ports);
ms_in_desc.bNumEmbMIDIJack = midi->out_ports;
/* ... and add them to the list */
midi_function[i++] = (struct usb_descriptor_header *) &bulk_out_desc;
midi_function[i++] = (struct usb_descriptor_header *) &ms_out_desc;
midi_function[i++] = (struct usb_descriptor_header *) &bulk_in_desc;
midi_function[i++] = (struct usb_descriptor_header *) &ms_in_desc;
midi_function[i++] = NULL;
/*
* support all relevant hardware speeds... we expect that when
* hardware is dual speed, all bulk-capable endpoints work at
* both speeds
*/
/* copy descriptors, and track endpoint copies */
f->fs_descriptors = usb_copy_descriptors(midi_function);
if (!f->fs_descriptors)
goto fail_f_midi;
if (gadget_is_dualspeed(c->cdev->gadget)) {
bulk_in_desc.wMaxPacketSize = cpu_to_le16(512);
bulk_out_desc.wMaxPacketSize = cpu_to_le16(512);
f->hs_descriptors = usb_copy_descriptors(midi_function);
if (!f->hs_descriptors)
goto fail_f_midi;
}
kfree(midi_function);
return 0;
fail_f_midi:
kfree(midi_function);
usb_free_descriptors(f->hs_descriptors);
fail:
/* we might as well release our claims on endpoints */
if (midi->out_ep)
midi->out_ep->driver_data = NULL;
if (midi->in_ep)
midi->in_ep->driver_data = NULL;
ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
return status;
}
/**
* f_midi_bind_config - add USB MIDI function to a configuration
* @c: the configuration to supcard the USB audio function
* @index: the soundcard index to use for the ALSA device creation
* @id: the soundcard id to use for the ALSA device creation
* @buflen: the buffer length to use
* @qlen the number of read requests to pre-allocate
* Context: single threaded during gadget setup
*
* Returns zero on success, else negative errno.
*/
int /* __init */ f_midi_bind_config(struct usb_configuration *c,
int index, char *id,
unsigned int in_ports,
unsigned int out_ports,
unsigned int buflen,
unsigned int qlen,
struct midi_alsa_config* config)
{
struct f_midi *midi;
int status, i;
if (config) {
config->card = -1;
config->device = -1;
}
/* sanity check */
if (in_ports > MAX_PORTS || out_ports > MAX_PORTS)
return -EINVAL;
/* allocate and initialize one new instance */
midi = kzalloc(sizeof *midi, GFP_KERNEL);
if (!midi) {
status = -ENOMEM;
goto fail;
}
for (i = 0; i < in_ports; i++) {
struct gmidi_in_port *port = kzalloc(sizeof(*port), GFP_KERNEL);
if (!port) {
status = -ENOMEM;
goto setup_fail;
}
port->midi = midi;
port->active = 0;
port->cable = i;
midi->in_port[i] = port;
}
midi->gadget = c->cdev->gadget;
tasklet_init(&midi->tasklet, f_midi_in_tasklet, (unsigned long) midi);
/* set up ALSA midi devices */
midi->id = kstrdup(id, GFP_KERNEL);
midi->index = index;
midi->buflen = buflen;
midi->qlen = qlen;
midi->in_ports = in_ports;
midi->out_ports = out_ports;
status = f_midi_register_card(midi);
if (status < 0)
goto setup_fail;
midi->func.name = "gmidi function";
midi->func.strings = midi_strings;
midi->func.bind = f_midi_bind;
midi->func.unbind = f_midi_unbind;
midi->func.set_alt = f_midi_set_alt;
midi->func.disable = f_midi_disable;
status = usb_add_function(c, &midi->func);
if (status)
goto setup_fail;
if (config) {
config->card = midi->rmidi->card->number;
config->device = midi->rmidi->device;
}
return 0;
setup_fail:
for (--i; i >= 0; i--)
kfree(midi->in_port[i]);
kfree(midi);
fail:
return status;
}