2 * f_midi.c -- USB MIDI class function driver
4 * Copyright (C) 2006 Thumtronics Pty Ltd.
5 * Developed for Thumtronics by Grey Innovation
6 * Ben Williamson <ben.williamson@greyinnovation.com>
8 * Rewritten for the composite framework
9 * Copyright (C) 2011 Daniel Mack <zonque@gmail.com>
11 * Based on drivers/usb/gadget/f_audio.c,
12 * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
13 * Copyright (C) 2008 Analog Devices, Inc
15 * and drivers/usb/gadget/midi.c,
16 * Copyright (C) 2006 Thumtronics Pty Ltd.
17 * Ben Williamson <ben.williamson@greyinnovation.com>
19 * Licensed under the GPL-2 or later.
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/slab.h>
25 #include <linux/device.h>
27 #include <sound/core.h>
28 #include <sound/initval.h>
29 #include <sound/rawmidi.h>
31 #include <linux/usb/ch9.h>
32 #include <linux/usb/gadget.h>
33 #include <linux/usb/audio.h>
34 #include <linux/usb/midi.h>
39 MODULE_AUTHOR("Ben Williamson");
40 MODULE_LICENSE("GPL v2");
42 static const char f_midi_shortname[] = "f_midi";
43 static const char f_midi_longname[] = "MIDI Gadget";
46 * We can only handle 16 cables on one single endpoint, as cable numbers are
47 * stored in 4-bit fields. And as the interface currently only holds one
48 * single endpoint, this is the maximum number of ports we can allow.
53 * This is a gadget, and the IN/OUT naming is from the host's perspective.
54 * USB -> OUT endpoint -> rawmidi
55 * USB <- IN endpoint <- rawmidi
57 struct gmidi_in_port {
62 #define STATE_UNKNOWN 0
63 #define STATE_1PARAM 1
64 #define STATE_2PARAM_1 2
65 #define STATE_2PARAM_2 3
66 #define STATE_SYSEX_0 4
67 #define STATE_SYSEX_1 5
68 #define STATE_SYSEX_2 6
73 struct usb_function func;
74 struct usb_gadget *gadget;
75 struct usb_ep *in_ep, *out_ep;
76 struct snd_card *card;
77 struct snd_rawmidi *rmidi;
79 struct snd_rawmidi_substream *in_substream[MAX_PORTS];
80 struct snd_rawmidi_substream *out_substream[MAX_PORTS];
81 struct gmidi_in_port *in_port[MAX_PORTS];
83 unsigned long out_triggered;
84 struct tasklet_struct tasklet;
85 unsigned int in_ports;
86 unsigned int out_ports;
89 unsigned int buflen, qlen;
92 static inline struct f_midi *func_to_midi(struct usb_function *f)
94 return container_of(f, struct f_midi, func);
97 static void f_midi_transmit(struct f_midi *midi, struct usb_request *req);
99 DECLARE_UAC_AC_HEADER_DESCRIPTOR(1);
100 DECLARE_USB_MIDI_OUT_JACK_DESCRIPTOR(1);
101 DECLARE_USB_MS_ENDPOINT_DESCRIPTOR(16);
103 /* B.3.1 Standard AC Interface Descriptor */
104 static struct usb_interface_descriptor ac_interface_desc = {
105 .bLength = USB_DT_INTERFACE_SIZE,
106 .bDescriptorType = USB_DT_INTERFACE,
107 /* .bInterfaceNumber = DYNAMIC */
108 /* .bNumEndpoints = DYNAMIC */
109 .bInterfaceClass = USB_CLASS_AUDIO,
110 .bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
111 /* .iInterface = DYNAMIC */
114 /* B.3.2 Class-Specific AC Interface Descriptor */
115 static struct uac1_ac_header_descriptor_1 ac_header_desc = {
116 .bLength = UAC_DT_AC_HEADER_SIZE(1),
117 .bDescriptorType = USB_DT_CS_INTERFACE,
118 .bDescriptorSubtype = USB_MS_HEADER,
119 .bcdADC = cpu_to_le16(0x0100),
120 .wTotalLength = cpu_to_le16(UAC_DT_AC_HEADER_SIZE(1)),
122 /* .baInterfaceNr = DYNAMIC */
125 /* B.4.1 Standard MS Interface Descriptor */
126 static struct usb_interface_descriptor ms_interface_desc = {
127 .bLength = USB_DT_INTERFACE_SIZE,
128 .bDescriptorType = USB_DT_INTERFACE,
129 /* .bInterfaceNumber = DYNAMIC */
131 .bInterfaceClass = USB_CLASS_AUDIO,
132 .bInterfaceSubClass = USB_SUBCLASS_MIDISTREAMING,
133 /* .iInterface = DYNAMIC */
136 /* B.4.2 Class-Specific MS Interface Descriptor */
137 static struct usb_ms_header_descriptor ms_header_desc = {
138 .bLength = USB_DT_MS_HEADER_SIZE,
139 .bDescriptorType = USB_DT_CS_INTERFACE,
140 .bDescriptorSubtype = USB_MS_HEADER,
141 .bcdMSC = cpu_to_le16(0x0100),
142 /* .wTotalLength = DYNAMIC */
145 /* B.5.1 Standard Bulk OUT Endpoint Descriptor */
146 static struct usb_endpoint_descriptor bulk_out_desc = {
147 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
148 .bDescriptorType = USB_DT_ENDPOINT,
149 .bEndpointAddress = USB_DIR_OUT,
150 .bmAttributes = USB_ENDPOINT_XFER_BULK,
153 /* B.5.2 Class-specific MS Bulk OUT Endpoint Descriptor */
154 static struct usb_ms_endpoint_descriptor_16 ms_out_desc = {
155 /* .bLength = DYNAMIC */
156 .bDescriptorType = USB_DT_CS_ENDPOINT,
157 .bDescriptorSubtype = USB_MS_GENERAL,
158 /* .bNumEmbMIDIJack = DYNAMIC */
159 /* .baAssocJackID = DYNAMIC */
162 /* B.6.1 Standard Bulk IN Endpoint Descriptor */
163 static struct usb_endpoint_descriptor bulk_in_desc = {
164 .bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
165 .bDescriptorType = USB_DT_ENDPOINT,
166 .bEndpointAddress = USB_DIR_IN,
167 .bmAttributes = USB_ENDPOINT_XFER_BULK,
170 /* B.6.2 Class-specific MS Bulk IN Endpoint Descriptor */
171 static struct usb_ms_endpoint_descriptor_16 ms_in_desc = {
172 /* .bLength = DYNAMIC */
173 .bDescriptorType = USB_DT_CS_ENDPOINT,
174 .bDescriptorSubtype = USB_MS_GENERAL,
175 /* .bNumEmbMIDIJack = DYNAMIC */
176 /* .baAssocJackID = DYNAMIC */
179 /* string IDs are assigned dynamically */
181 #define STRING_FUNC_IDX 0
183 static struct usb_string midi_string_defs[] = {
184 [STRING_FUNC_IDX].s = "MIDI function",
185 { } /* end of list */
188 static struct usb_gadget_strings midi_stringtab = {
189 .language = 0x0409, /* en-us */
190 .strings = midi_string_defs,
193 static struct usb_gadget_strings *midi_strings[] = {
198 static inline struct usb_request *midi_alloc_ep_req(struct usb_ep *ep,
201 return alloc_ep_req(ep, length, length);
204 static void free_ep_req(struct usb_ep *ep, struct usb_request *req)
207 usb_ep_free_request(ep, req);
210 static const uint8_t f_midi_cin_length[] = {
211 0, 0, 2, 3, 3, 1, 2, 3, 3, 3, 3, 3, 2, 2, 3, 1
215 * Receives a chunk of MIDI data.
217 static void f_midi_read_data(struct usb_ep *ep, int cable,
218 uint8_t *data, int length)
220 struct f_midi *midi = ep->driver_data;
221 struct snd_rawmidi_substream *substream = midi->out_substream[cable];
224 /* Nobody is listening - throw it on the floor. */
227 if (!test_bit(cable, &midi->out_triggered))
230 snd_rawmidi_receive(substream, data, length);
233 static void f_midi_handle_out_data(struct usb_ep *ep, struct usb_request *req)
238 for (i = 0; i + 3 < req->actual; i += 4)
240 int cable = buf[i] >> 4;
241 int length = f_midi_cin_length[buf[i] & 0x0f];
242 f_midi_read_data(ep, cable, &buf[i + 1], length);
247 f_midi_complete(struct usb_ep *ep, struct usb_request *req)
249 struct f_midi *midi = ep->driver_data;
250 struct usb_composite_dev *cdev = midi->func.config->cdev;
251 int status = req->status;
254 case 0: /* normal completion */
255 if (ep == midi->out_ep) {
256 /* We received stuff. req is queued again, below */
257 f_midi_handle_out_data(ep, req);
258 } else if (ep == midi->in_ep) {
259 /* Our transmit completed. See if there's more to go.
260 * f_midi_transmit eats req, don't queue it again. */
261 f_midi_transmit(midi, req);
266 /* this endpoint is normally active while we're configured */
267 case -ECONNABORTED: /* hardware forced ep reset */
268 case -ECONNRESET: /* request dequeued */
269 case -ESHUTDOWN: /* disconnect from host */
270 VDBG(cdev, "%s gone (%d), %d/%d\n", ep->name, status,
271 req->actual, req->length);
272 if (ep == midi->out_ep)
273 f_midi_handle_out_data(ep, req);
275 free_ep_req(ep, req);
278 case -EOVERFLOW: /* buffer overrun on read means that
279 * we didn't provide a big enough buffer.
282 DBG(cdev, "%s complete --> %d, %d/%d\n", ep->name,
283 status, req->actual, req->length);
285 case -EREMOTEIO: /* short read */
289 status = usb_ep_queue(ep, req, GFP_ATOMIC);
291 ERROR(cdev, "kill %s: resubmit %d bytes --> %d\n",
292 ep->name, req->length, status);
294 /* FIXME recover later ... somehow */
298 static int f_midi_start_ep(struct f_midi *midi,
299 struct usb_function *f,
303 struct usb_composite_dev *cdev = f->config->cdev;
308 err = config_ep_by_speed(midi->gadget, f, ep);
310 ERROR(cdev, "can't configure %s: %d\n", ep->name, err);
314 err = usb_ep_enable(ep);
316 ERROR(cdev, "can't start %s: %d\n", ep->name, err);
320 ep->driver_data = midi;
325 static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
327 struct f_midi *midi = func_to_midi(f);
328 struct usb_composite_dev *cdev = f->config->cdev;
332 /* For Control Device interface we do nothing */
336 err = f_midi_start_ep(midi, f, midi->in_ep);
340 err = f_midi_start_ep(midi, f, midi->out_ep);
344 if (midi->out_ep->driver_data)
345 usb_ep_disable(midi->out_ep);
347 err = config_ep_by_speed(midi->gadget, f, midi->out_ep);
349 ERROR(cdev, "can't configure %s: %d\n",
350 midi->out_ep->name, err);
354 err = usb_ep_enable(midi->out_ep);
356 ERROR(cdev, "can't start %s: %d\n",
357 midi->out_ep->name, err);
361 midi->out_ep->driver_data = midi;
363 /* allocate a bunch of read buffers and queue them all at once. */
364 for (i = 0; i < midi->qlen && err == 0; i++) {
365 struct usb_request *req =
366 midi_alloc_ep_req(midi->out_ep, midi->buflen);
370 req->complete = f_midi_complete;
371 err = usb_ep_queue(midi->out_ep, req, GFP_ATOMIC);
373 ERROR(midi, "%s queue req: %d\n",
374 midi->out_ep->name, err);
381 static void f_midi_disable(struct usb_function *f)
383 struct f_midi *midi = func_to_midi(f);
384 struct usb_composite_dev *cdev = f->config->cdev;
386 DBG(cdev, "disable\n");
389 * just disable endpoints, forcing completion of pending i/o.
390 * all our completion handlers free their requests in this case.
392 usb_ep_disable(midi->in_ep);
393 usb_ep_disable(midi->out_ep);
396 static int f_midi_snd_free(struct snd_device *device)
401 static void f_midi_transmit_packet(struct usb_request *req, uint8_t p0,
402 uint8_t p1, uint8_t p2, uint8_t p3)
404 unsigned length = req->length;
405 u8 *buf = (u8 *)req->buf + length;
411 req->length = length + 4;
415 * Converts MIDI commands to USB MIDI packets.
417 static void f_midi_transmit_byte(struct usb_request *req,
418 struct gmidi_in_port *port, uint8_t b)
420 uint8_t p0 = port->cable << 4;
423 f_midi_transmit_packet(req, p0 | 0x0f, b, 0, 0);
424 } else if (b >= 0xf0) {
428 port->state = STATE_SYSEX_1;
433 port->state = STATE_1PARAM;
437 port->state = STATE_2PARAM_1;
441 port->state = STATE_UNKNOWN;
444 f_midi_transmit_packet(req, p0 | 0x05, 0xf6, 0, 0);
445 port->state = STATE_UNKNOWN;
448 switch (port->state) {
450 f_midi_transmit_packet(req,
451 p0 | 0x05, 0xf7, 0, 0);
454 f_midi_transmit_packet(req,
455 p0 | 0x06, port->data[0], 0xf7, 0);
458 f_midi_transmit_packet(req,
459 p0 | 0x07, port->data[0],
460 port->data[1], 0xf7);
463 port->state = STATE_UNKNOWN;
466 } else if (b >= 0x80) {
468 if (b >= 0xc0 && b <= 0xdf)
469 port->state = STATE_1PARAM;
471 port->state = STATE_2PARAM_1;
472 } else { /* b < 0x80 */
473 switch (port->state) {
475 if (port->data[0] < 0xf0) {
476 p0 |= port->data[0] >> 4;
479 port->state = STATE_UNKNOWN;
481 f_midi_transmit_packet(req, p0, port->data[0], b, 0);
485 port->state = STATE_2PARAM_2;
488 if (port->data[0] < 0xf0) {
489 p0 |= port->data[0] >> 4;
490 port->state = STATE_2PARAM_1;
493 port->state = STATE_UNKNOWN;
495 f_midi_transmit_packet(req,
496 p0, port->data[0], port->data[1], b);
500 port->state = STATE_SYSEX_1;
504 port->state = STATE_SYSEX_2;
507 f_midi_transmit_packet(req,
508 p0 | 0x04, port->data[0], port->data[1], b);
509 port->state = STATE_SYSEX_0;
515 static void f_midi_transmit(struct f_midi *midi, struct usb_request *req)
517 struct usb_ep *ep = midi->in_ep;
524 req = midi_alloc_ep_req(ep, midi->buflen);
527 ERROR(midi, "%s: alloc_ep_request failed\n", __func__);
531 req->complete = f_midi_complete;
533 for (i = 0; i < MAX_PORTS; i++) {
534 struct gmidi_in_port *port = midi->in_port[i];
535 struct snd_rawmidi_substream *substream = midi->in_substream[i];
537 if (!port || !port->active || !substream)
540 while (req->length + 3 < midi->buflen) {
542 if (snd_rawmidi_transmit(substream, &b, 1) != 1) {
546 f_midi_transmit_byte(req, port, b);
550 if (req->length > 0) {
553 err = usb_ep_queue(ep, req, GFP_ATOMIC);
555 ERROR(midi, "%s queue req: %d\n",
556 midi->in_ep->name, err);
558 free_ep_req(ep, req);
562 static void f_midi_in_tasklet(unsigned long data)
564 struct f_midi *midi = (struct f_midi *) data;
565 f_midi_transmit(midi, NULL);
568 static int f_midi_in_open(struct snd_rawmidi_substream *substream)
570 struct f_midi *midi = substream->rmidi->private_data;
572 if (!midi->in_port[substream->number])
575 VDBG(midi, "%s()\n", __func__);
576 midi->in_substream[substream->number] = substream;
577 midi->in_port[substream->number]->state = STATE_UNKNOWN;
581 static int f_midi_in_close(struct snd_rawmidi_substream *substream)
583 struct f_midi *midi = substream->rmidi->private_data;
585 VDBG(midi, "%s()\n", __func__);
589 static void f_midi_in_trigger(struct snd_rawmidi_substream *substream, int up)
591 struct f_midi *midi = substream->rmidi->private_data;
593 if (!midi->in_port[substream->number])
596 VDBG(midi, "%s() %d\n", __func__, up);
597 midi->in_port[substream->number]->active = up;
599 tasklet_hi_schedule(&midi->tasklet);
602 static int f_midi_out_open(struct snd_rawmidi_substream *substream)
604 struct f_midi *midi = substream->rmidi->private_data;
606 if (substream->number >= MAX_PORTS)
609 VDBG(midi, "%s()\n", __func__);
610 midi->out_substream[substream->number] = substream;
614 static int f_midi_out_close(struct snd_rawmidi_substream *substream)
616 struct f_midi *midi = substream->rmidi->private_data;
618 VDBG(midi, "%s()\n", __func__);
622 static void f_midi_out_trigger(struct snd_rawmidi_substream *substream, int up)
624 struct f_midi *midi = substream->rmidi->private_data;
626 VDBG(midi, "%s()\n", __func__);
629 set_bit(substream->number, &midi->out_triggered);
631 clear_bit(substream->number, &midi->out_triggered);
634 static struct snd_rawmidi_ops gmidi_in_ops = {
635 .open = f_midi_in_open,
636 .close = f_midi_in_close,
637 .trigger = f_midi_in_trigger,
640 static struct snd_rawmidi_ops gmidi_out_ops = {
641 .open = f_midi_out_open,
642 .close = f_midi_out_close,
643 .trigger = f_midi_out_trigger
646 static inline void f_midi_unregister_card(struct f_midi *midi)
649 snd_card_free(midi->card);
654 /* register as a sound "card" */
655 static int f_midi_register_card(struct f_midi *midi)
657 struct snd_card *card;
658 struct snd_rawmidi *rmidi;
660 static struct snd_device_ops ops = {
661 .dev_free = f_midi_snd_free,
664 err = snd_card_new(&midi->gadget->dev, midi->index, midi->id,
665 THIS_MODULE, 0, &card);
667 ERROR(midi, "snd_card_new() failed\n");
672 err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, midi, &ops);
674 ERROR(midi, "snd_device_new() failed: error %d\n", err);
678 strcpy(card->driver, f_midi_longname);
679 strcpy(card->longname, f_midi_longname);
680 strcpy(card->shortname, f_midi_shortname);
683 snd_component_add(card, "MIDI");
684 err = snd_rawmidi_new(card, card->longname, 0,
685 midi->out_ports, midi->in_ports, &rmidi);
687 ERROR(midi, "snd_rawmidi_new() failed: error %d\n", err);
691 strcpy(rmidi->name, card->shortname);
692 rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
693 SNDRV_RAWMIDI_INFO_INPUT |
694 SNDRV_RAWMIDI_INFO_DUPLEX;
695 rmidi->private_data = midi;
698 * Yes, rawmidi OUTPUT = USB IN, and rawmidi INPUT = USB OUT.
699 * It's an upside-down world being a gadget.
701 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, &gmidi_in_ops);
702 snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, &gmidi_out_ops);
704 /* register it - we're ready to go */
705 err = snd_card_register(card);
707 ERROR(midi, "snd_card_register() failed\n");
711 VDBG(midi, "%s() finished ok\n", __func__);
715 f_midi_unregister_card(midi);
719 /* MIDI function driver setup/binding */
721 static int f_midi_bind(struct usb_configuration *c, struct usb_function *f)
723 struct usb_descriptor_header **midi_function;
724 struct usb_midi_in_jack_descriptor jack_in_ext_desc[MAX_PORTS];
725 struct usb_midi_in_jack_descriptor jack_in_emb_desc[MAX_PORTS];
726 struct usb_midi_out_jack_descriptor_1 jack_out_ext_desc[MAX_PORTS];
727 struct usb_midi_out_jack_descriptor_1 jack_out_emb_desc[MAX_PORTS];
728 struct usb_composite_dev *cdev = c->cdev;
729 struct f_midi *midi = func_to_midi(f);
730 struct usb_string *us;
731 int status, n, jack = 1, i = 0;
733 midi->gadget = cdev->gadget;
734 tasklet_init(&midi->tasklet, f_midi_in_tasklet, (unsigned long) midi);
735 status = f_midi_register_card(midi);
739 /* maybe allocate device-global string ID */
740 us = usb_gstrings_attach(c->cdev, midi_strings,
741 ARRAY_SIZE(midi_string_defs));
743 status = PTR_ERR(us);
746 ac_interface_desc.iInterface = us[STRING_FUNC_IDX].id;
748 /* We have two interfaces, AudioControl and MIDIStreaming */
749 status = usb_interface_id(c, f);
752 ac_interface_desc.bInterfaceNumber = status;
754 status = usb_interface_id(c, f);
757 ms_interface_desc.bInterfaceNumber = status;
758 ac_header_desc.baInterfaceNr[0] = status;
762 /* allocate instance-specific endpoints */
763 midi->in_ep = usb_ep_autoconfig(cdev->gadget, &bulk_in_desc);
766 midi->in_ep->driver_data = cdev; /* claim */
768 midi->out_ep = usb_ep_autoconfig(cdev->gadget, &bulk_out_desc);
771 midi->out_ep->driver_data = cdev; /* claim */
773 /* allocate temporary function list */
774 midi_function = kcalloc((MAX_PORTS * 4) + 9, sizeof(*midi_function),
776 if (!midi_function) {
782 * construct the function's descriptor set. As the number of
783 * input and output MIDI ports is configurable, we have to do
787 /* add the headers - these are always the same */
788 midi_function[i++] = (struct usb_descriptor_header *) &ac_interface_desc;
789 midi_function[i++] = (struct usb_descriptor_header *) &ac_header_desc;
790 midi_function[i++] = (struct usb_descriptor_header *) &ms_interface_desc;
792 /* calculate the header's wTotalLength */
793 n = USB_DT_MS_HEADER_SIZE
794 + (midi->in_ports + midi->out_ports) *
795 (USB_DT_MIDI_IN_SIZE + USB_DT_MIDI_OUT_SIZE(1));
796 ms_header_desc.wTotalLength = cpu_to_le16(n);
798 midi_function[i++] = (struct usb_descriptor_header *) &ms_header_desc;
800 /* configure the external IN jacks, each linked to an embedded OUT jack */
801 for (n = 0; n < midi->in_ports; n++) {
802 struct usb_midi_in_jack_descriptor *in_ext = &jack_in_ext_desc[n];
803 struct usb_midi_out_jack_descriptor_1 *out_emb = &jack_out_emb_desc[n];
805 in_ext->bLength = USB_DT_MIDI_IN_SIZE;
806 in_ext->bDescriptorType = USB_DT_CS_INTERFACE;
807 in_ext->bDescriptorSubtype = USB_MS_MIDI_IN_JACK;
808 in_ext->bJackType = USB_MS_EXTERNAL;
809 in_ext->bJackID = jack++;
811 midi_function[i++] = (struct usb_descriptor_header *) in_ext;
813 out_emb->bLength = USB_DT_MIDI_OUT_SIZE(1);
814 out_emb->bDescriptorType = USB_DT_CS_INTERFACE;
815 out_emb->bDescriptorSubtype = USB_MS_MIDI_OUT_JACK;
816 out_emb->bJackType = USB_MS_EMBEDDED;
817 out_emb->bJackID = jack++;
818 out_emb->bNrInputPins = 1;
819 out_emb->pins[0].baSourcePin = 1;
820 out_emb->pins[0].baSourceID = in_ext->bJackID;
822 midi_function[i++] = (struct usb_descriptor_header *) out_emb;
824 /* link it to the endpoint */
825 ms_in_desc.baAssocJackID[n] = out_emb->bJackID;
828 /* configure the external OUT jacks, each linked to an embedded IN jack */
829 for (n = 0; n < midi->out_ports; n++) {
830 struct usb_midi_in_jack_descriptor *in_emb = &jack_in_emb_desc[n];
831 struct usb_midi_out_jack_descriptor_1 *out_ext = &jack_out_ext_desc[n];
833 in_emb->bLength = USB_DT_MIDI_IN_SIZE;
834 in_emb->bDescriptorType = USB_DT_CS_INTERFACE;
835 in_emb->bDescriptorSubtype = USB_MS_MIDI_IN_JACK;
836 in_emb->bJackType = USB_MS_EMBEDDED;
837 in_emb->bJackID = jack++;
839 midi_function[i++] = (struct usb_descriptor_header *) in_emb;
841 out_ext->bLength = USB_DT_MIDI_OUT_SIZE(1);
842 out_ext->bDescriptorType = USB_DT_CS_INTERFACE;
843 out_ext->bDescriptorSubtype = USB_MS_MIDI_OUT_JACK;
844 out_ext->bJackType = USB_MS_EXTERNAL;
845 out_ext->bJackID = jack++;
846 out_ext->bNrInputPins = 1;
848 out_ext->pins[0].baSourceID = in_emb->bJackID;
849 out_ext->pins[0].baSourcePin = 1;
850 midi_function[i++] = (struct usb_descriptor_header *) out_ext;
852 /* link it to the endpoint */
853 ms_out_desc.baAssocJackID[n] = in_emb->bJackID;
856 /* configure the endpoint descriptors ... */
857 ms_out_desc.bLength = USB_DT_MS_ENDPOINT_SIZE(midi->in_ports);
858 ms_out_desc.bNumEmbMIDIJack = midi->in_ports;
860 ms_in_desc.bLength = USB_DT_MS_ENDPOINT_SIZE(midi->out_ports);
861 ms_in_desc.bNumEmbMIDIJack = midi->out_ports;
863 /* ... and add them to the list */
864 midi_function[i++] = (struct usb_descriptor_header *) &bulk_out_desc;
865 midi_function[i++] = (struct usb_descriptor_header *) &ms_out_desc;
866 midi_function[i++] = (struct usb_descriptor_header *) &bulk_in_desc;
867 midi_function[i++] = (struct usb_descriptor_header *) &ms_in_desc;
868 midi_function[i++] = NULL;
871 * support all relevant hardware speeds... we expect that when
872 * hardware is dual speed, all bulk-capable endpoints work at
875 /* copy descriptors, and track endpoint copies */
876 f->fs_descriptors = usb_copy_descriptors(midi_function);
877 if (!f->fs_descriptors)
880 if (gadget_is_dualspeed(c->cdev->gadget)) {
881 bulk_in_desc.wMaxPacketSize = cpu_to_le16(512);
882 bulk_out_desc.wMaxPacketSize = cpu_to_le16(512);
883 f->hs_descriptors = usb_copy_descriptors(midi_function);
884 if (!f->hs_descriptors)
888 kfree(midi_function);
893 kfree(midi_function);
894 usb_free_descriptors(f->hs_descriptors);
896 f_midi_unregister_card(midi);
898 /* we might as well release our claims on endpoints */
900 midi->out_ep->driver_data = NULL;
902 midi->in_ep->driver_data = NULL;
904 ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
909 static inline struct f_midi_opts *to_f_midi_opts(struct config_item *item)
911 return container_of(to_config_group(item), struct f_midi_opts,
915 CONFIGFS_ATTR_STRUCT(f_midi_opts);
916 CONFIGFS_ATTR_OPS(f_midi_opts);
918 static void midi_attr_release(struct config_item *item)
920 struct f_midi_opts *opts = to_f_midi_opts(item);
922 usb_put_function_instance(&opts->func_inst);
925 static struct configfs_item_operations midi_item_ops = {
926 .release = midi_attr_release,
927 .show_attribute = f_midi_opts_attr_show,
928 .store_attribute = f_midi_opts_attr_store,
931 #define F_MIDI_OPT(name, test_limit, limit) \
932 static ssize_t f_midi_opts_##name##_show(struct f_midi_opts *opts, char *page) \
936 mutex_lock(&opts->lock); \
937 result = sprintf(page, "%d\n", opts->name); \
938 mutex_unlock(&opts->lock); \
943 static ssize_t f_midi_opts_##name##_store(struct f_midi_opts *opts, \
944 const char *page, size_t len) \
949 mutex_lock(&opts->lock); \
950 if (opts->refcnt) { \
955 ret = kstrtou32(page, 0, &num); \
959 if (test_limit && num > limit) { \
967 mutex_unlock(&opts->lock); \
971 static struct f_midi_opts_attribute f_midi_opts_##name = \
972 __CONFIGFS_ATTR(name, S_IRUGO | S_IWUSR, f_midi_opts_##name##_show, \
973 f_midi_opts_##name##_store)
975 F_MIDI_OPT(index, true, SNDRV_CARDS);
976 F_MIDI_OPT(buflen, false, 0);
977 F_MIDI_OPT(qlen, false, 0);
978 F_MIDI_OPT(in_ports, true, MAX_PORTS);
979 F_MIDI_OPT(out_ports, true, MAX_PORTS);
981 static ssize_t f_midi_opts_id_show(struct f_midi_opts *opts, char *page)
985 mutex_lock(&opts->lock);
987 result = strlcpy(page, opts->id, PAGE_SIZE);
993 mutex_unlock(&opts->lock);
998 static ssize_t f_midi_opts_id_store(struct f_midi_opts *opts,
999 const char *page, size_t len)
1004 mutex_lock(&opts->lock);
1010 c = kstrndup(page, len, GFP_KERNEL);
1015 if (opts->id_allocated)
1018 opts->id_allocated = true;
1021 mutex_unlock(&opts->lock);
1025 static struct f_midi_opts_attribute f_midi_opts_id =
1026 __CONFIGFS_ATTR(id, S_IRUGO | S_IWUSR, f_midi_opts_id_show,
1027 f_midi_opts_id_store);
1029 static struct configfs_attribute *midi_attrs[] = {
1030 &f_midi_opts_index.attr,
1031 &f_midi_opts_buflen.attr,
1032 &f_midi_opts_qlen.attr,
1033 &f_midi_opts_in_ports.attr,
1034 &f_midi_opts_out_ports.attr,
1035 &f_midi_opts_id.attr,
1039 static struct config_item_type midi_func_type = {
1040 .ct_item_ops = &midi_item_ops,
1041 .ct_attrs = midi_attrs,
1042 .ct_owner = THIS_MODULE,
1045 static void f_midi_free_inst(struct usb_function_instance *f)
1047 struct f_midi_opts *opts;
1049 opts = container_of(f, struct f_midi_opts, func_inst);
1051 if (opts->id_allocated)
1057 static struct usb_function_instance *f_midi_alloc_inst(void)
1059 struct f_midi_opts *opts;
1061 opts = kzalloc(sizeof(*opts), GFP_KERNEL);
1063 return ERR_PTR(-ENOMEM);
1065 mutex_init(&opts->lock);
1066 opts->func_inst.free_func_inst = f_midi_free_inst;
1067 opts->index = SNDRV_DEFAULT_IDX1;
1068 opts->id = SNDRV_DEFAULT_STR1;
1072 opts->out_ports = 1;
1074 config_group_init_type_name(&opts->func_inst.group, "",
1077 return &opts->func_inst;
1080 static void f_midi_free(struct usb_function *f)
1082 struct f_midi *midi;
1083 struct f_midi_opts *opts;
1086 midi = func_to_midi(f);
1087 opts = container_of(f->fi, struct f_midi_opts, func_inst);
1089 mutex_lock(&opts->lock);
1090 for (i = opts->in_ports - 1; i >= 0; --i)
1091 kfree(midi->in_port[i]);
1094 mutex_unlock(&opts->lock);
1097 static void f_midi_unbind(struct usb_configuration *c, struct usb_function *f)
1099 struct usb_composite_dev *cdev = f->config->cdev;
1100 struct f_midi *midi = func_to_midi(f);
1101 struct snd_card *card;
1103 DBG(cdev, "unbind\n");
1105 /* just to be sure */
1111 snd_card_free(card);
1113 usb_free_all_descriptors(f);
1116 static struct usb_function *f_midi_alloc(struct usb_function_instance *fi)
1118 struct f_midi *midi;
1119 struct f_midi_opts *opts;
1122 opts = container_of(fi, struct f_midi_opts, func_inst);
1124 mutex_lock(&opts->lock);
1126 if (opts->in_ports > MAX_PORTS || opts->out_ports > MAX_PORTS) {
1127 mutex_unlock(&opts->lock);
1128 return ERR_PTR(-EINVAL);
1131 /* allocate and initialize one new instance */
1132 midi = kzalloc(sizeof(*midi), GFP_KERNEL);
1134 mutex_unlock(&opts->lock);
1135 return ERR_PTR(-ENOMEM);
1138 for (i = 0; i < opts->in_ports; i++) {
1139 struct gmidi_in_port *port = kzalloc(sizeof(*port), GFP_KERNEL);
1143 mutex_unlock(&opts->lock);
1150 midi->in_port[i] = port;
1153 /* set up ALSA midi devices */
1154 midi->id = kstrdup(opts->id, GFP_KERNEL);
1155 if (opts->id && !midi->id) {
1157 mutex_unlock(&opts->lock);
1160 midi->in_ports = opts->in_ports;
1161 midi->out_ports = opts->out_ports;
1162 midi->index = opts->index;
1163 midi->buflen = opts->buflen;
1164 midi->qlen = opts->qlen;
1166 mutex_unlock(&opts->lock);
1168 midi->func.name = "gmidi function";
1169 midi->func.bind = f_midi_bind;
1170 midi->func.unbind = f_midi_unbind;
1171 midi->func.set_alt = f_midi_set_alt;
1172 midi->func.disable = f_midi_disable;
1173 midi->func.free_func = f_midi_free;
1178 for (--i; i >= 0; i--)
1179 kfree(midi->in_port[i]);
1181 return ERR_PTR(status);
1184 DECLARE_USB_FUNCTION_INIT(midi, f_midi_alloc_inst, f_midi_alloc);