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- /*
- * 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/module.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>
- #include "u_f.h"
- #include "u_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 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 = {
- .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 = {
- .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 = {
- .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 = {
- .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 inline struct usb_request *midi_alloc_ep_req(struct usb_ep *ep,
- unsigned length)
- {
- return alloc_ep_req(ep, length, length);
- }
- 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);
- 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;
- 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;
- /* For Control Device interface we do nothing */
- if (intf == 0)
- return 0;
- 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;
- 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,
- max_t(unsigned, midi->buflen,
- bulk_out_desc.wMaxPacketSize));
- 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);
- free_ep_req(midi->out_ep, req);
- }
- }
- 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 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, "%s: alloc_ep_request failed\n", __func__);
- 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 && ep->enabled) {
- int err;
- err = usb_ep_queue(ep, req, GFP_ATOMIC);
- if (err < 0)
- ERROR(midi, "%s queue req: %d\n",
- midi->in_ep->name, err);
- } else {
- 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
- };
- static inline void f_midi_unregister_card(struct f_midi *midi)
- {
- if (midi->card) {
- snd_card_free(midi->card);
- midi->card = NULL;
- }
- }
- /* 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_new(&midi->gadget->dev, midi->index, midi->id,
- THIS_MODULE, 0, &card);
- if (err < 0) {
- ERROR(midi, "snd_card_new() 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);
- /* 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:
- f_midi_unregister_card(midi);
- return err;
- }
- /* MIDI function driver setup/binding */
- static int 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);
- struct usb_string *us;
- int status, n, jack = 1, i = 0;
- midi->gadget = cdev->gadget;
- tasklet_init(&midi->tasklet, f_midi_in_tasklet, (unsigned long) midi);
- status = f_midi_register_card(midi);
- if (status < 0)
- goto fail_register;
- /* maybe allocate device-global string ID */
- us = usb_gstrings_attach(c->cdev, midi_strings,
- ARRAY_SIZE(midi_string_defs));
- if (IS_ERR(us)) {
- status = PTR_ERR(us);
- goto fail;
- }
- ac_interface_desc.iInterface = us[STRING_FUNC_IDX].id;
- /* 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->out_ep = usb_ep_autoconfig(cdev->gadget, &bulk_out_desc);
- if (!midi->out_ep)
- goto fail;
- /* 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:
- f_midi_unregister_card(midi);
- fail_register:
- ERROR(cdev, "%s: can't bind, err %d\n", f->name, status);
- return status;
- }
- static inline struct f_midi_opts *to_f_midi_opts(struct config_item *item)
- {
- return container_of(to_config_group(item), struct f_midi_opts,
- func_inst.group);
- }
- static void midi_attr_release(struct config_item *item)
- {
- struct f_midi_opts *opts = to_f_midi_opts(item);
- usb_put_function_instance(&opts->func_inst);
- }
- static struct configfs_item_operations midi_item_ops = {
- .release = midi_attr_release,
- };
- #define F_MIDI_OPT(name, test_limit, limit) \
- static ssize_t f_midi_opts_##name##_show(struct config_item *item, char *page) \
- { \
- struct f_midi_opts *opts = to_f_midi_opts(item); \
- int result; \
- \
- mutex_lock(&opts->lock); \
- result = sprintf(page, "%d\n", opts->name); \
- mutex_unlock(&opts->lock); \
- \
- return result; \
- } \
- \
- static ssize_t f_midi_opts_##name##_store(struct config_item *item, \
- const char *page, size_t len) \
- { \
- struct f_midi_opts *opts = to_f_midi_opts(item); \
- int ret; \
- u32 num; \
- \
- mutex_lock(&opts->lock); \
- if (opts->refcnt) { \
- ret = -EBUSY; \
- goto end; \
- } \
- \
- ret = kstrtou32(page, 0, &num); \
- if (ret) \
- goto end; \
- \
- if (test_limit && num > limit) { \
- ret = -EINVAL; \
- goto end; \
- } \
- opts->name = num; \
- ret = len; \
- \
- end: \
- mutex_unlock(&opts->lock); \
- return ret; \
- } \
- \
- CONFIGFS_ATTR(f_midi_opts_, name);
- F_MIDI_OPT(index, true, SNDRV_CARDS);
- F_MIDI_OPT(buflen, false, 0);
- F_MIDI_OPT(qlen, false, 0);
- F_MIDI_OPT(in_ports, true, MAX_PORTS);
- F_MIDI_OPT(out_ports, true, MAX_PORTS);
- static ssize_t f_midi_opts_id_show(struct config_item *item, char *page)
- {
- struct f_midi_opts *opts = to_f_midi_opts(item);
- int result;
- mutex_lock(&opts->lock);
- if (opts->id) {
- result = strlcpy(page, opts->id, PAGE_SIZE);
- } else {
- page[0] = 0;
- result = 0;
- }
- mutex_unlock(&opts->lock);
- return result;
- }
- static ssize_t f_midi_opts_id_store(struct config_item *item,
- const char *page, size_t len)
- {
- struct f_midi_opts *opts = to_f_midi_opts(item);
- int ret;
- char *c;
- mutex_lock(&opts->lock);
- if (opts->refcnt) {
- ret = -EBUSY;
- goto end;
- }
- c = kstrndup(page, len, GFP_KERNEL);
- if (!c) {
- ret = -ENOMEM;
- goto end;
- }
- if (opts->id_allocated)
- kfree(opts->id);
- opts->id = c;
- opts->id_allocated = true;
- ret = len;
- end:
- mutex_unlock(&opts->lock);
- return ret;
- }
- CONFIGFS_ATTR(f_midi_opts_, id);
- static struct configfs_attribute *midi_attrs[] = {
- &f_midi_opts_attr_index,
- &f_midi_opts_attr_buflen,
- &f_midi_opts_attr_qlen,
- &f_midi_opts_attr_in_ports,
- &f_midi_opts_attr_out_ports,
- &f_midi_opts_attr_id,
- NULL,
- };
- static struct config_item_type midi_func_type = {
- .ct_item_ops = &midi_item_ops,
- .ct_attrs = midi_attrs,
- .ct_owner = THIS_MODULE,
- };
- static void f_midi_free_inst(struct usb_function_instance *f)
- {
- struct f_midi_opts *opts;
- opts = container_of(f, struct f_midi_opts, func_inst);
- if (opts->id_allocated)
- kfree(opts->id);
- kfree(opts);
- }
- static struct usb_function_instance *f_midi_alloc_inst(void)
- {
- struct f_midi_opts *opts;
- opts = kzalloc(sizeof(*opts), GFP_KERNEL);
- if (!opts)
- return ERR_PTR(-ENOMEM);
- mutex_init(&opts->lock);
- opts->func_inst.free_func_inst = f_midi_free_inst;
- opts->index = SNDRV_DEFAULT_IDX1;
- opts->id = SNDRV_DEFAULT_STR1;
- opts->buflen = 256;
- opts->qlen = 32;
- opts->in_ports = 1;
- opts->out_ports = 1;
- config_group_init_type_name(&opts->func_inst.group, "",
- &midi_func_type);
- return &opts->func_inst;
- }
- static void f_midi_free(struct usb_function *f)
- {
- struct f_midi *midi;
- struct f_midi_opts *opts;
- int i;
- midi = func_to_midi(f);
- opts = container_of(f->fi, struct f_midi_opts, func_inst);
- kfree(midi->id);
- mutex_lock(&opts->lock);
- for (i = opts->in_ports - 1; i >= 0; --i)
- kfree(midi->in_port[i]);
- kfree(midi);
- --opts->refcnt;
- mutex_unlock(&opts->lock);
- }
- 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(card);
- usb_free_all_descriptors(f);
- }
- static struct usb_function *f_midi_alloc(struct usb_function_instance *fi)
- {
- struct f_midi *midi;
- struct f_midi_opts *opts;
- int status, i;
- opts = container_of(fi, struct f_midi_opts, func_inst);
- mutex_lock(&opts->lock);
- /* sanity check */
- if (opts->in_ports > MAX_PORTS || opts->out_ports > MAX_PORTS) {
- mutex_unlock(&opts->lock);
- return ERR_PTR(-EINVAL);
- }
- /* allocate and initialize one new instance */
- midi = kzalloc(sizeof(*midi), GFP_KERNEL);
- if (!midi) {
- mutex_unlock(&opts->lock);
- return ERR_PTR(-ENOMEM);
- }
- for (i = 0; i < opts->in_ports; i++) {
- struct gmidi_in_port *port = kzalloc(sizeof(*port), GFP_KERNEL);
- if (!port) {
- status = -ENOMEM;
- mutex_unlock(&opts->lock);
- goto setup_fail;
- }
- port->midi = midi;
- port->active = 0;
- port->cable = i;
- midi->in_port[i] = port;
- }
- /* set up ALSA midi devices */
- midi->id = kstrdup(opts->id, GFP_KERNEL);
- if (opts->id && !midi->id) {
- status = -ENOMEM;
- mutex_unlock(&opts->lock);
- goto setup_fail;
- }
- midi->in_ports = opts->in_ports;
- midi->out_ports = opts->out_ports;
- midi->index = opts->index;
- midi->buflen = opts->buflen;
- midi->qlen = opts->qlen;
- ++opts->refcnt;
- mutex_unlock(&opts->lock);
- midi->func.name = "gmidi function";
- 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;
- midi->func.free_func = f_midi_free;
- return &midi->func;
- setup_fail:
- for (--i; i >= 0; i--)
- kfree(midi->in_port[i]);
- kfree(midi);
- return ERR_PTR(status);
- }
- DECLARE_USB_FUNCTION_INIT(midi, f_midi_alloc_inst, f_midi_alloc);
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