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linux/drivers/usb/gadget/function/f_midi2.c
Michael Grzeschik d9c61bb33f usb: gadget: function: move u_f.h to include/linux/usb/func_utils.h 
We move the func_utils.h header to include/linux/usb to be
able to compile function drivers outside of the
drivers/usb/gadget/function directory.

Signed-off-by: Michael Grzeschik <m.grzeschik@pengutronix.de>
Link: https://lore.kernel.org/r/20240116-ml-topic-u9p-v12-1-9a27de5160e0@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-09-03 09:57:08 +02:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* f_midi2.c -- USB MIDI 2.0 class function driver
*/
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/ump.h>
#include <sound/ump_msg.h>
#include <sound/ump_convert.h>
#include <linux/usb/ch9.h>
#include <linux/usb/func_utils.h>
#include <linux/usb/gadget.h>
#include <linux/usb/audio.h>
#include <linux/usb/midi-v2.h>
#include "u_midi2.h"
struct f_midi2;
struct f_midi2_ep;
struct f_midi2_usb_ep;
/* Context for each USB request */
struct f_midi2_req_ctx {
struct f_midi2_usb_ep *usb_ep; /* belonging USB EP */
unsigned int index; /* array index: 0-31 */
struct usb_request *req; /* assigned request */
};
/* Resources for a USB Endpoint */
struct f_midi2_usb_ep {
struct f_midi2 *card; /* belonging card */
struct f_midi2_ep *ep; /* belonging UMP EP (optional) */
struct usb_ep *usb_ep; /* assigned USB EP */
void (*complete)(struct usb_ep *usb_ep, struct usb_request *req);
unsigned long free_reqs; /* bitmap for unused requests */
unsigned int num_reqs; /* number of allocated requests */
struct f_midi2_req_ctx *reqs; /* request context array */
};
/* Resources for UMP Function Block (and USB Group Terminal Block) */
struct f_midi2_block {
struct f_midi2_block_info info; /* FB info, copied from configfs */
struct snd_ump_block *fb; /* assigned FB */
unsigned int gtb_id; /* assigned GTB id */
unsigned int string_id; /* assigned string id */
};
/* Temporary buffer for altset 0 MIDI 1.0 handling */
struct f_midi2_midi1_port {
unsigned int pending; /* pending bytes on the input buffer */
u8 buf[32]; /* raw MIDI 1.0 byte input */
u8 state; /* running status */
u8 data[2]; /* rendered USB MIDI 1.0 packet data */
};
/* MIDI 1.0 message states */
enum {
STATE_INITIAL = 0, /* pseudo state */
STATE_1PARAM,
STATE_2PARAM_1,
STATE_2PARAM_2,
STATE_SYSEX_0,
STATE_SYSEX_1,
STATE_SYSEX_2,
STATE_REAL_TIME,
STATE_FINISHED, /* pseudo state */
};
/* Resources for UMP Endpoint */
struct f_midi2_ep {
struct snd_ump_endpoint *ump; /* assigned UMP EP */
struct f_midi2 *card; /* belonging MIDI 2.0 device */
struct f_midi2_ep_info info; /* UMP EP info, copied from configfs */
unsigned int num_blks; /* number of FBs */
struct f_midi2_block blks[SNDRV_UMP_MAX_BLOCKS]; /* UMP FBs */
struct f_midi2_usb_ep ep_in; /* USB MIDI EP-in */
struct f_midi2_usb_ep ep_out; /* USB MIDI EP-out */
u8 in_group_to_cable[SNDRV_UMP_MAX_GROUPS]; /* map to cable; 1-based! */
};
/* indices for USB strings */
enum {
STR_IFACE = 0,
STR_GTB1 = 1,
};
/* 1-based GTB id to string id */
#define gtb_to_str_id(id) (STR_GTB1 + (id) - 1)
/* mapping from MIDI 1.0 cable to UMP group */
struct midi1_cable_mapping {
struct f_midi2_ep *ep;
unsigned char block;
unsigned char group;
};
/* operation mode */
enum {
MIDI_OP_MODE_UNSET, /* no altset set yet */
MIDI_OP_MODE_MIDI1, /* MIDI 1.0 (altset 0) is used */
MIDI_OP_MODE_MIDI2, /* MIDI 2.0 (altset 1) is used */
};
/* Resources for MIDI 2.0 Device */
struct f_midi2 {
struct usb_function func;
struct usb_gadget *gadget;
struct snd_card *card;
/* MIDI 1.0 in/out USB EPs */
struct f_midi2_usb_ep midi1_ep_in;
struct f_midi2_usb_ep midi1_ep_out;
/* number of MIDI 1.0 I/O cables */
unsigned int num_midi1_in;
unsigned int num_midi1_out;
/* conversion for MIDI 1.0 EP-in */
struct f_midi2_midi1_port midi1_port[MAX_CABLES];
/* conversion for MIDI 1.0 EP-out */
struct ump_cvt_to_ump midi1_ump_cvt;
/* mapping between cables and UMP groups */
struct midi1_cable_mapping in_cable_mapping[MAX_CABLES];
struct midi1_cable_mapping out_cable_mapping[MAX_CABLES];
int midi_if; /* USB MIDI interface number */
int operation_mode; /* current operation mode */
spinlock_t queue_lock;
struct f_midi2_card_info info; /* card info, copied from configfs */
unsigned int num_eps;
struct f_midi2_ep midi2_eps[MAX_UMP_EPS];
unsigned int total_blocks; /* total number of blocks of all EPs */
struct usb_string *string_defs;
struct usb_string *strings;
};
#define func_to_midi2(f) container_of(f, struct f_midi2, func)
/* convert from MIDI protocol number (1 or 2) to SNDRV_UMP_EP_INFO_PROTO_* */
#define to_ump_protocol(v) (((v) & 3) << 8)
/* get EP name string */
static const char *ump_ep_name(const struct f_midi2_ep *ep)
{
return ep->info.ep_name ? ep->info.ep_name : "MIDI 2.0 Gadget";
}
/* get EP product ID string */
static const char *ump_product_id(const struct f_midi2_ep *ep)
{
return ep->info.product_id ? ep->info.product_id : "Unique Product ID";
}
/* get FB name string */
static const char *ump_fb_name(const struct f_midi2_block_info *info)
{
return info->name ? info->name : "MIDI 2.0 Gadget I/O";
}
/*
* USB Descriptor Definitions
*/
/* GTB header descriptor */
static struct usb_ms20_gr_trm_block_header_descriptor gtb_header_desc = {
.bLength = sizeof(gtb_header_desc),
.bDescriptorType = USB_DT_CS_GR_TRM_BLOCK,
.bDescriptorSubtype = USB_MS_GR_TRM_BLOCK_HEADER,
.wTotalLength = __cpu_to_le16(0x12), // to be filled
};
/* GTB descriptor template: most items are replaced dynamically */
static struct usb_ms20_gr_trm_block_descriptor gtb_desc = {
.bLength = sizeof(gtb_desc),
.bDescriptorType = USB_DT_CS_GR_TRM_BLOCK,
.bDescriptorSubtype = USB_MS_GR_TRM_BLOCK,
.bGrpTrmBlkID = 0x01,
.bGrpTrmBlkType = USB_MS_GR_TRM_BLOCK_TYPE_BIDIRECTIONAL,
.nGroupTrm = 0x00,
.nNumGroupTrm = 1,
.iBlockItem = 0,
.bMIDIProtocol = USB_MS_MIDI_PROTO_1_0_64,
.wMaxInputBandwidth = 0,
.wMaxOutputBandwidth = 0,
};
DECLARE_USB_MIDI_OUT_JACK_DESCRIPTOR(1);
DECLARE_USB_MS_ENDPOINT_DESCRIPTOR(16);
DECLARE_UAC_AC_HEADER_DESCRIPTOR(1);
DECLARE_USB_MS20_ENDPOINT_DESCRIPTOR(32);
#define EP_MAX_PACKET_INT 8
/* Audio Control Interface */
static struct usb_interface_descriptor midi2_audio_if_desc = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 0, // to be filled
.bNumEndpoints = 0,
.bInterfaceClass = USB_CLASS_AUDIO,
.bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
.bInterfaceProtocol = 0,
.iInterface = 0,
};
static struct uac1_ac_header_descriptor_1 midi2_audio_class_desc = {
.bLength = 0x09,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = 0x01,
.bcdADC = __cpu_to_le16(0x0100),
.wTotalLength = __cpu_to_le16(0x0009),
.bInCollection = 0x01,
.baInterfaceNr = { 0x01 }, // to be filled
};
/* MIDI 1.0 Streaming Interface (altset 0) */
static struct usb_interface_descriptor midi2_midi1_if_desc = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 0, // to be filled
.bAlternateSetting = 0,
.bNumEndpoints = 2, // to be filled
.bInterfaceClass = USB_CLASS_AUDIO,
.bInterfaceSubClass = USB_SUBCLASS_MIDISTREAMING,
.bInterfaceProtocol = 0,
.iInterface = 0, // to be filled
};
static struct usb_ms_header_descriptor midi2_midi1_class_desc = {
.bLength = 0x07,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = USB_MS_HEADER,
.bcdMSC = __cpu_to_le16(0x0100),
.wTotalLength = __cpu_to_le16(0x41), // to be calculated
};
/* MIDI 1.0 EP OUT */
static struct usb_endpoint_descriptor midi2_midi1_ep_out_desc = {
.bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_OUT | 0, // set up dynamically
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static struct usb_ss_ep_comp_descriptor midi2_midi1_ep_out_ss_comp_desc = {
.bLength = sizeof(midi2_midi1_ep_out_ss_comp_desc),
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
};
static struct usb_ms_endpoint_descriptor_16 midi2_midi1_ep_out_class_desc = {
.bLength = 0x05, // to be filled
.bDescriptorType = USB_DT_CS_ENDPOINT,
.bDescriptorSubtype = USB_MS_GENERAL,
.bNumEmbMIDIJack = 1,
.baAssocJackID = { 0x01 },
};
/* MIDI 1.0 EP IN */
static struct usb_endpoint_descriptor midi2_midi1_ep_in_desc = {
.bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
.bDescriptorType = USB_DT_ENDPOINT,
.bEndpointAddress = USB_DIR_IN | 0, // set up dynamically
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
static struct usb_ss_ep_comp_descriptor midi2_midi1_ep_in_ss_comp_desc = {
.bLength = sizeof(midi2_midi1_ep_in_ss_comp_desc),
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
};
static struct usb_ms_endpoint_descriptor_16 midi2_midi1_ep_in_class_desc = {
.bLength = 0x05, // to be filled
.bDescriptorType = USB_DT_CS_ENDPOINT,
.bDescriptorSubtype = USB_MS_GENERAL,
.bNumEmbMIDIJack = 1,
.baAssocJackID = { 0x03 },
};
/* MIDI 2.0 Streaming Interface (altset 1) */
static struct usb_interface_descriptor midi2_midi2_if_desc = {
.bLength = USB_DT_INTERFACE_SIZE,
.bDescriptorType = USB_DT_INTERFACE,
.bInterfaceNumber = 0, // to be filled
.bAlternateSetting = 1,
.bNumEndpoints = 2, // to be filled
.bInterfaceClass = USB_CLASS_AUDIO,
.bInterfaceSubClass = USB_SUBCLASS_MIDISTREAMING,
.bInterfaceProtocol = 0,
.iInterface = 0, // to be filled
};
static struct usb_ms_header_descriptor midi2_midi2_class_desc = {
.bLength = 0x07,
.bDescriptorType = USB_DT_CS_INTERFACE,
.bDescriptorSubtype = USB_MS_HEADER,
.bcdMSC = __cpu_to_le16(0x0200),
.wTotalLength = __cpu_to_le16(0x07),
};
/* MIDI 2.0 EP OUT */
static struct usb_endpoint_descriptor midi2_midi2_ep_out_desc[MAX_UMP_EPS];
static struct usb_ss_ep_comp_descriptor midi2_midi2_ep_out_ss_comp_desc = {
.bLength = sizeof(midi2_midi1_ep_out_ss_comp_desc),
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
};
static struct usb_ms20_endpoint_descriptor_32 midi2_midi2_ep_out_class_desc[MAX_UMP_EPS];
/* MIDI 2.0 EP IN */
static struct usb_endpoint_descriptor midi2_midi2_ep_in_desc[MAX_UMP_EPS];
static struct usb_ss_ep_comp_descriptor midi2_midi2_ep_in_ss_comp_desc = {
.bLength = sizeof(midi2_midi2_ep_in_ss_comp_desc),
.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
};
static struct usb_ms20_endpoint_descriptor_32 midi2_midi2_ep_in_class_desc[MAX_UMP_EPS];
/* Arrays of descriptors to be created */
static void *midi2_audio_descs[] = {
&midi2_audio_if_desc,
&midi2_audio_class_desc,
NULL
};
static void *midi2_midi1_descs[] = {
&midi2_midi1_if_desc,
&midi2_midi1_class_desc,
NULL
};
static void *midi2_midi1_ep_out_descs[] = {
&midi2_midi1_ep_out_desc,
&midi2_midi1_ep_out_class_desc,
NULL
};
static void *midi2_midi1_ep_in_descs[] = {
&midi2_midi1_ep_in_desc,
&midi2_midi1_ep_in_class_desc,
NULL
};
static void *midi2_midi1_ep_out_ss_descs[] = {
&midi2_midi1_ep_out_desc,
&midi2_midi1_ep_out_ss_comp_desc,
&midi2_midi1_ep_out_class_desc,
NULL
};
static void *midi2_midi1_ep_in_ss_descs[] = {
&midi2_midi1_ep_in_desc,
&midi2_midi1_ep_in_ss_comp_desc,
&midi2_midi1_ep_in_class_desc,
NULL
};
static void *midi2_midi2_descs[] = {
&midi2_midi2_if_desc,
&midi2_midi2_class_desc,
NULL
};
/*
* USB request handling
*/
/* get an empty request for the given EP */
static struct usb_request *get_empty_request(struct f_midi2_usb_ep *usb_ep)
{
struct usb_request *req = NULL;
unsigned long flags;
int index;
spin_lock_irqsave(&usb_ep->card->queue_lock, flags);
if (!usb_ep->free_reqs)
goto unlock;
index = find_first_bit(&usb_ep->free_reqs, usb_ep->num_reqs);
if (index >= usb_ep->num_reqs)
goto unlock;
req = usb_ep->reqs[index].req;
if (!req)
goto unlock;
clear_bit(index, &usb_ep->free_reqs);
req->length = 0;
unlock:
spin_unlock_irqrestore(&usb_ep->card->queue_lock, flags);
return req;
}
/* put the empty request back */
static void put_empty_request(struct usb_request *req)
{
struct f_midi2_req_ctx *ctx = req->context;
unsigned long flags;
spin_lock_irqsave(&ctx->usb_ep->card->queue_lock, flags);
set_bit(ctx->index, &ctx->usb_ep->free_reqs);
spin_unlock_irqrestore(&ctx->usb_ep->card->queue_lock, flags);
}
/*
* UMP v1.1 Stream message handling
*/
/* queue a request to UMP EP; request is either queued or freed after this */
static int queue_request_ep_raw(struct usb_request *req)
{
struct f_midi2_req_ctx *ctx = req->context;
int err;
req->complete = ctx->usb_ep->complete;
err = usb_ep_queue(ctx->usb_ep->usb_ep, req, GFP_ATOMIC);
if (err) {
put_empty_request(req);
return err;
}
return 0;
}
/* queue a request with endianness conversion */
static int queue_request_ep_in(struct usb_request *req)
{
/* UMP packets have to be converted to little-endian */
cpu_to_le32_array((u32 *)req->buf, req->length >> 2);
return queue_request_ep_raw(req);
}
/* reply a UMP packet via EP-in */
static int reply_ep_in(struct f_midi2_ep *ep, const void *buf, int len)
{
struct f_midi2_usb_ep *usb_ep = &ep->ep_in;
struct usb_request *req;
req = get_empty_request(usb_ep);
if (!req)
return -ENOSPC;
req->length = len;
memcpy(req->buf, buf, len);
return queue_request_ep_in(req);
}
/* reply a UMP stream EP info */
static void reply_ump_stream_ep_info(struct f_midi2_ep *ep)
{
struct snd_ump_stream_msg_ep_info rep = {
.type = UMP_MSG_TYPE_STREAM,
.status = UMP_STREAM_MSG_STATUS_EP_INFO,
.ump_version_major = 0x01,
.ump_version_minor = 0x01,
.num_function_blocks = ep->num_blks,
.static_function_block = !!ep->card->info.static_block,
.protocol = (UMP_STREAM_MSG_EP_INFO_CAP_MIDI1 |
UMP_STREAM_MSG_EP_INFO_CAP_MIDI2) >> 8,
};
reply_ep_in(ep, &rep, sizeof(rep));
}
/* reply a UMP EP device info */
static void reply_ump_stream_ep_device(struct f_midi2_ep *ep)
{
struct snd_ump_stream_msg_devince_info rep = {
.type = UMP_MSG_TYPE_STREAM,
.status = UMP_STREAM_MSG_STATUS_DEVICE_INFO,
.manufacture_id = ep->info.manufacturer,
.family_lsb = ep->info.family & 0xff,
.family_msb = (ep->info.family >> 8) & 0xff,
.model_lsb = ep->info.model & 0xff,
.model_msb = (ep->info.model >> 8) & 0xff,
.sw_revision = ep->info.sw_revision,
};
reply_ep_in(ep, &rep, sizeof(rep));
}
#define UMP_STREAM_PKT_BYTES 16 /* UMP stream packet size = 16 bytes*/
#define UMP_STREAM_EP_STR_OFF 2 /* offset of name string for EP info */
#define UMP_STREAM_FB_STR_OFF 3 /* offset of name string for FB info */
/* Helper to replay a string */
static void reply_ump_stream_string(struct f_midi2_ep *ep, const u8 *name,
unsigned int type, unsigned int extra,
unsigned int start_ofs)
{
struct f_midi2_usb_ep *usb_ep = &ep->ep_in;
struct f_midi2 *midi2 = ep->card;
struct usb_request *req;
unsigned int pos;
u32 *buf;
if (!*name)
return;
req = get_empty_request(usb_ep);
if (!req)
return;
buf = (u32 *)req->buf;
pos = start_ofs;
for (;;) {
if (pos == start_ofs) {
memset(buf, 0, UMP_STREAM_PKT_BYTES);
buf[0] = ump_stream_compose(type, 0) | extra;
}
buf[pos / 4] |= *name++ << ((3 - (pos % 4)) * 8);
if (!*name) {
if (req->length)
buf[0] |= UMP_STREAM_MSG_FORMAT_END << 26;
req->length += UMP_STREAM_PKT_BYTES;
break;
}
if (++pos == UMP_STREAM_PKT_BYTES) {
if (!req->length)
buf[0] |= UMP_STREAM_MSG_FORMAT_START << 26;
else
buf[0] |= UMP_STREAM_MSG_FORMAT_CONTINUE << 26;
req->length += UMP_STREAM_PKT_BYTES;
if (midi2->info.req_buf_size - req->length < UMP_STREAM_PKT_BYTES)
break;
buf += 4;
pos = start_ofs;
}
}
if (req->length)
queue_request_ep_in(req);
else
put_empty_request(req);
}
/* Reply a UMP EP name string */
static void reply_ump_stream_ep_name(struct f_midi2_ep *ep)
{
reply_ump_stream_string(ep, ump_ep_name(ep),
UMP_STREAM_MSG_STATUS_EP_NAME, 0,
UMP_STREAM_EP_STR_OFF);
}
/* Reply a UMP EP product ID string */
static void reply_ump_stream_ep_pid(struct f_midi2_ep *ep)
{
reply_ump_stream_string(ep, ump_product_id(ep),
UMP_STREAM_MSG_STATUS_PRODUCT_ID, 0,
UMP_STREAM_EP_STR_OFF);
}
/* Reply a UMP EP stream config */
static void reply_ump_stream_ep_config(struct f_midi2_ep *ep)
{
struct snd_ump_stream_msg_stream_cfg rep = {
.type = UMP_MSG_TYPE_STREAM,
.status = UMP_STREAM_MSG_STATUS_STREAM_CFG,
};
if (ep->info.protocol == 2)
rep.protocol = UMP_STREAM_MSG_EP_INFO_CAP_MIDI2 >> 8;
else
rep.protocol = UMP_STREAM_MSG_EP_INFO_CAP_MIDI1 >> 8;
reply_ep_in(ep, &rep, sizeof(rep));
}
/* Reply a UMP FB info */
static void reply_ump_stream_fb_info(struct f_midi2_ep *ep, int blk)
{
struct f_midi2_block_info *b = &ep->blks[blk].info;
struct snd_ump_stream_msg_fb_info rep = {
.type = UMP_MSG_TYPE_STREAM,
.status = UMP_STREAM_MSG_STATUS_FB_INFO,
.active = !!b->active,
.function_block_id = blk,
.ui_hint = b->ui_hint,
.midi_10 = b->is_midi1,
.direction = b->direction,
.first_group = b->first_group,
.num_groups = b->num_groups,
.midi_ci_version = b->midi_ci_version,
.sysex8_streams = b->sysex8_streams,
};
reply_ep_in(ep, &rep, sizeof(rep));
}
/* Reply a FB name string */
static void reply_ump_stream_fb_name(struct f_midi2_ep *ep, unsigned int blk)
{
reply_ump_stream_string(ep, ump_fb_name(&ep->blks[blk].info),
UMP_STREAM_MSG_STATUS_FB_NAME, blk << 8,
UMP_STREAM_FB_STR_OFF);
}
/* Process a UMP Stream message */
static void process_ump_stream_msg(struct f_midi2_ep *ep, const u32 *data)
{
struct f_midi2 *midi2 = ep->card;
unsigned int format, status, blk;
format = ump_stream_message_format(*data);
status = ump_stream_message_status(*data);
switch (status) {
case UMP_STREAM_MSG_STATUS_EP_DISCOVERY:
if (format)
return; // invalid
if (data[1] & UMP_STREAM_MSG_REQUEST_EP_INFO)
reply_ump_stream_ep_info(ep);
if (data[1] & UMP_STREAM_MSG_REQUEST_DEVICE_INFO)
reply_ump_stream_ep_device(ep);
if (data[1] & UMP_STREAM_MSG_REQUEST_EP_NAME)
reply_ump_stream_ep_name(ep);
if (data[1] & UMP_STREAM_MSG_REQUEST_PRODUCT_ID)
reply_ump_stream_ep_pid(ep);
if (data[1] & UMP_STREAM_MSG_REQUEST_STREAM_CFG)
reply_ump_stream_ep_config(ep);
return;
case UMP_STREAM_MSG_STATUS_STREAM_CFG_REQUEST:
if (*data & UMP_STREAM_MSG_EP_INFO_CAP_MIDI2) {
ep->info.protocol = 2;
DBG(midi2, "Switching Protocol to MIDI2\n");
} else {
ep->info.protocol = 1;
DBG(midi2, "Switching Protocol to MIDI1\n");
}
snd_ump_switch_protocol(ep->ump, to_ump_protocol(ep->info.protocol));
reply_ump_stream_ep_config(ep);
return;
case UMP_STREAM_MSG_STATUS_FB_DISCOVERY:
if (format)
return; // invalid
blk = (*data >> 8) & 0xff;
if (blk == 0xff) {
/* inquiry for all blocks */
for (blk = 0; blk < ep->num_blks; blk++) {
if (*data & UMP_STREAM_MSG_REQUEST_FB_INFO)
reply_ump_stream_fb_info(ep, blk);
if (*data & UMP_STREAM_MSG_REQUEST_FB_NAME)
reply_ump_stream_fb_name(ep, blk);
}
} else if (blk < ep->num_blks) {
/* only the specified block */
if (*data & UMP_STREAM_MSG_REQUEST_FB_INFO)
reply_ump_stream_fb_info(ep, blk);
if (*data & UMP_STREAM_MSG_REQUEST_FB_NAME)
reply_ump_stream_fb_name(ep, blk);
}
return;
}
}
/* Process UMP messages included in a USB request */
static void process_ump(struct f_midi2_ep *ep, const struct usb_request *req)
{
const u32 *data = (u32 *)req->buf;
int len = req->actual >> 2;
const u32 *in_buf = ep->ump->input_buf;
for (; len > 0; len--, data++) {
if (snd_ump_receive_ump_val(ep->ump, *data) <= 0)
continue;
if (ump_message_type(*in_buf) == UMP_MSG_TYPE_STREAM)
process_ump_stream_msg(ep, in_buf);
}
}
/*
* MIDI 2.0 UMP USB request handling
*/
/* complete handler for UMP EP-out requests */
static void f_midi2_ep_out_complete(struct usb_ep *usb_ep,
struct usb_request *req)
{
struct f_midi2_req_ctx *ctx = req->context;
struct f_midi2_ep *ep = ctx->usb_ep->ep;
struct f_midi2 *midi2 = ep->card;
int status = req->status;
if (status) {
DBG(midi2, "%s complete error %d: %d/%d\n",
usb_ep->name, status, req->actual, req->length);
goto error;
}
/* convert to UMP packet in native endianness */
le32_to_cpu_array((u32 *)req->buf, req->actual >> 2);
if (midi2->info.process_ump)
process_ump(ep, req);
snd_ump_receive(ep->ump, req->buf, req->actual & ~3);
if (midi2->operation_mode != MIDI_OP_MODE_MIDI2)
goto error;
if (queue_request_ep_raw(req))
goto error;
return;
error:
put_empty_request(req);
}
/* Transmit UMP packets received from user-space to the gadget */
static void process_ump_transmit(struct f_midi2_ep *ep)
{
struct f_midi2_usb_ep *usb_ep = &ep->ep_in;
struct f_midi2 *midi2 = ep->card;
struct usb_request *req;
int len;
if (!usb_ep->usb_ep->enabled)
return;
for (;;) {
req = get_empty_request(usb_ep);
if (!req)
break;
len = snd_ump_transmit(ep->ump, (u32 *)req->buf,
midi2->info.req_buf_size);
if (len <= 0) {
put_empty_request(req);
break;
}
req->length = len;
if (queue_request_ep_in(req) < 0)
break;
}
}
/* Complete handler for UMP EP-in requests */
static void f_midi2_ep_in_complete(struct usb_ep *usb_ep,
struct usb_request *req)
{
struct f_midi2_req_ctx *ctx = req->context;
struct f_midi2_ep *ep = ctx->usb_ep->ep;
struct f_midi2 *midi2 = ep->card;
int status = req->status;
put_empty_request(req);
if (status) {
DBG(midi2, "%s complete error %d: %d/%d\n",
usb_ep->name, status, req->actual, req->length);
return;
}
process_ump_transmit(ep);
}
/*
* MIDI1 (altset 0) USB request handling
*/
/* process one MIDI byte -- copied from f_midi.c
*
* fill the packet or request if needed
* returns true if the request became empty (queued)
*/
static bool process_midi1_byte(struct f_midi2 *midi2, u8 cable, u8 b,
struct usb_request **req_p)
{
struct f_midi2_midi1_port *port = &midi2->midi1_port[cable];
u8 p[4] = { cable << 4, 0, 0, 0 };
int next_state = STATE_INITIAL;
struct usb_request *req = *req_p;
switch (b) {
case 0xf8 ... 0xff:
/* System Real-Time Messages */
p[0] |= 0x0f;
p[1] = b;
next_state = port->state;
port->state = STATE_REAL_TIME;
break;
case 0xf7:
/* End of SysEx */
switch (port->state) {
case STATE_SYSEX_0:
p[0] |= 0x05;
p[1] = 0xf7;
next_state = STATE_FINISHED;
break;
case STATE_SYSEX_1:
p[0] |= 0x06;
p[1] = port->data[0];
p[2] = 0xf7;
next_state = STATE_FINISHED;
break;
case STATE_SYSEX_2:
p[0] |= 0x07;
p[1] = port->data[0];
p[2] = port->data[1];
p[3] = 0xf7;
next_state = STATE_FINISHED;
break;
default:
/* Ignore byte */
next_state = port->state;
port->state = STATE_INITIAL;
}
break;
case 0xf0 ... 0xf6:
/* System Common Messages */
port->data[0] = port->data[1] = 0;
port->state = STATE_INITIAL;
switch (b) {
case 0xf0:
port->data[0] = b;
port->data[1] = 0;
next_state = STATE_SYSEX_1;
break;
case 0xf1:
case 0xf3:
port->data[0] = b;
next_state = STATE_1PARAM;
break;
case 0xf2:
port->data[0] = b;
next_state = STATE_2PARAM_1;
break;
case 0xf4:
case 0xf5:
next_state = STATE_INITIAL;
break;
case 0xf6:
p[0] |= 0x05;
p[1] = 0xf6;
next_state = STATE_FINISHED;
break;
}
break;
case 0x80 ... 0xef:
/*
* Channel Voice Messages, Channel Mode Messages
* and Control Change Messages.
*/
port->data[0] = b;
port->data[1] = 0;
port->state = STATE_INITIAL;
if (b >= 0xc0 && b <= 0xdf)
next_state = STATE_1PARAM;
else
next_state = STATE_2PARAM_1;
break;
case 0x00 ... 0x7f:
/* Message parameters */
switch (port->state) {
case STATE_1PARAM:
if (port->data[0] < 0xf0)
p[0] |= port->data[0] >> 4;
else
p[0] |= 0x02;
p[1] = port->data[0];
p[2] = b;
/* This is to allow Running State Messages */
next_state = STATE_1PARAM;
break;
case STATE_2PARAM_1:
port->data[1] = b;
next_state = STATE_2PARAM_2;
break;
case STATE_2PARAM_2:
if (port->data[0] < 0xf0)
p[0] |= port->data[0] >> 4;
else
p[0] |= 0x03;
p[1] = port->data[0];
p[2] = port->data[1];
p[3] = b;
/* This is to allow Running State Messages */
next_state = STATE_2PARAM_1;
break;
case STATE_SYSEX_0:
port->data[0] = b;
next_state = STATE_SYSEX_1;
break;
case STATE_SYSEX_1:
port->data[1] = b;
next_state = STATE_SYSEX_2;
break;
case STATE_SYSEX_2:
p[0] |= 0x04;
p[1] = port->data[0];
p[2] = port->data[1];
p[3] = b;
next_state = STATE_SYSEX_0;
break;
}
break;
}
/* States where we have to write into the USB request */
if (next_state == STATE_FINISHED ||
port->state == STATE_SYSEX_2 ||
port->state == STATE_1PARAM ||
port->state == STATE_2PARAM_2 ||
port->state == STATE_REAL_TIME) {
memcpy(req->buf + req->length, p, sizeof(p));
req->length += sizeof(p);
if (next_state == STATE_FINISHED) {
next_state = STATE_INITIAL;
port->data[0] = port->data[1] = 0;
}
if (midi2->info.req_buf_size - req->length <= 4) {
queue_request_ep_raw(req);
*req_p = NULL;
return true;
}
}
port->state = next_state;
return false;
}
/* process all pending MIDI bytes in the internal buffer;
* returns true if the request gets empty
* returns false if all have been processed
*/
static bool process_midi1_pending_buf(struct f_midi2 *midi2,
struct usb_request **req_p)
{
unsigned int cable, c;
for (cable = 0; cable < midi2->num_midi1_in; cable++) {
struct f_midi2_midi1_port *port = &midi2->midi1_port[cable];
if (!port->pending)
continue;
for (c = 0; c < port->pending; c++) {
if (process_midi1_byte(midi2, cable, port->buf[c],
req_p)) {
port->pending -= c;
if (port->pending)
memmove(port->buf, port->buf + c,
port->pending);
return true;
}
}
port->pending = 0;
}
return false;
}
/* fill the MIDI bytes onto the temporary buffer
*/
static void fill_midi1_pending_buf(struct f_midi2 *midi2, u8 cable, u8 *buf,
unsigned int size)
{
struct f_midi2_midi1_port *port = &midi2->midi1_port[cable];
if (port->pending + size > sizeof(port->buf))
return;
memcpy(port->buf + port->pending, buf, size);
port->pending += size;
}
/* try to process data given from the associated UMP stream */
static void process_midi1_transmit(struct f_midi2 *midi2)
{
struct f_midi2_usb_ep *usb_ep = &midi2->midi1_ep_in;
struct f_midi2_ep *ep = &midi2->midi2_eps[0];
struct usb_request *req = NULL;
/* 12 is the largest outcome (4 MIDI1 cmds) for a single UMP packet */
unsigned char outbuf[12];
unsigned char group, cable;
int len, size;
u32 ump;
if (!usb_ep->usb_ep || !usb_ep->usb_ep->enabled)
return;
for (;;) {
if (!req) {
req = get_empty_request(usb_ep);
if (!req)
break;
}
if (process_midi1_pending_buf(midi2, &req))
continue;
len = snd_ump_transmit(ep->ump, &ump, 4);
if (len <= 0)
break;
if (snd_ump_receive_ump_val(ep->ump, ump) <= 0)
continue;
size = snd_ump_convert_from_ump(ep->ump->input_buf, outbuf,
&group);
if (size <= 0)
continue;
cable = ep->in_group_to_cable[group];
if (!cable)
continue;
cable--; /* to 0-base */
fill_midi1_pending_buf(midi2, cable, outbuf, size);
}
if (req) {
if (req->length)
queue_request_ep_raw(req);
else
put_empty_request(req);
}
}
/* complete handler for MIDI1 EP-in requests */
static void f_midi2_midi1_ep_in_complete(struct usb_ep *usb_ep,
struct usb_request *req)
{
struct f_midi2_req_ctx *ctx = req->context;
struct f_midi2 *midi2 = ctx->usb_ep->card;
int status = req->status;
put_empty_request(req);
if (status) {
DBG(midi2, "%s complete error %d: %d/%d\n",
usb_ep->name, status, req->actual, req->length);
return;
}
process_midi1_transmit(midi2);
}
/* complete handler for MIDI1 EP-out requests */
static void f_midi2_midi1_ep_out_complete(struct usb_ep *usb_ep,
struct usb_request *req)
{
struct f_midi2_req_ctx *ctx = req->context;
struct f_midi2 *midi2 = ctx->usb_ep->card;
struct f_midi2_ep *ep;
struct ump_cvt_to_ump *cvt = &midi2->midi1_ump_cvt;
static const u8 midi1_packet_bytes[16] = {
0, 0, 2, 3, 3, 1, 2, 3, 3, 3, 3, 3, 2, 2, 3, 1
};
unsigned int group, cable, bytes, c, len;
int status = req->status;
const u8 *buf = req->buf;
if (status) {
DBG(midi2, "%s complete error %d: %d/%d\n",
usb_ep->name, status, req->actual, req->length);
goto error;
}
len = req->actual >> 2;
for (; len; len--, buf += 4) {
cable = *buf >> 4;
ep = midi2->out_cable_mapping[cable].ep;
if (!ep)
continue;
group = midi2->out_cable_mapping[cable].group;
bytes = midi1_packet_bytes[*buf & 0x0f];
for (c = 0; c < bytes; c++) {
snd_ump_convert_to_ump(cvt, group,
to_ump_protocol(ep->info.protocol),
buf[c + 1]);
if (cvt->ump_bytes) {
snd_ump_receive(ep->ump, cvt->ump,
cvt->ump_bytes);
cvt->ump_bytes = 0;
}
}
}
if (midi2->operation_mode != MIDI_OP_MODE_MIDI1)
goto error;
if (queue_request_ep_raw(req))
goto error;
return;
error:
put_empty_request(req);
}
/*
* Common EP handling helpers
*/
/* Start MIDI EP */
static int f_midi2_start_ep(struct f_midi2_usb_ep *usb_ep,
struct usb_function *fn)
{
int err;
if (!usb_ep->usb_ep)
return 0;
usb_ep_disable(usb_ep->usb_ep);
err = config_ep_by_speed(usb_ep->card->gadget, fn, usb_ep->usb_ep);
if (err)
return err;
return usb_ep_enable(usb_ep->usb_ep);
}
/* Drop pending requests */
static void f_midi2_drop_reqs(struct f_midi2_usb_ep *usb_ep)
{
int i;
if (!usb_ep->usb_ep || !usb_ep->num_reqs)
return;
for (i = 0; i < usb_ep->num_reqs; i++) {
if (!test_bit(i, &usb_ep->free_reqs) && usb_ep->reqs[i].req) {
usb_ep_dequeue(usb_ep->usb_ep, usb_ep->reqs[i].req);
set_bit(i, &usb_ep->free_reqs);
}
}
}
/* Allocate requests for the given EP */
static int f_midi2_alloc_ep_reqs(struct f_midi2_usb_ep *usb_ep)
{
struct f_midi2 *midi2 = usb_ep->card;
int i;
if (!usb_ep->usb_ep)
return 0;
if (!usb_ep->reqs)
return -EINVAL;
for (i = 0; i < midi2->info.num_reqs; i++) {
if (usb_ep->reqs[i].req)
continue;
usb_ep->reqs[i].req = alloc_ep_req(usb_ep->usb_ep,
midi2->info.req_buf_size);
if (!usb_ep->reqs[i].req)
return -ENOMEM;
usb_ep->reqs[i].req->context = &usb_ep->reqs[i];
}
return 0;
}
/* Free allocated requests */
static void f_midi2_free_ep_reqs(struct f_midi2_usb_ep *usb_ep)
{
struct f_midi2 *midi2 = usb_ep->card;
int i;
for (i = 0; i < midi2->info.num_reqs; i++) {
if (!usb_ep->reqs[i].req)
continue;
free_ep_req(usb_ep->usb_ep, usb_ep->reqs[i].req);
usb_ep->reqs[i].req = NULL;
}
}
/* Initialize EP */
static int f_midi2_init_ep(struct f_midi2 *midi2, struct f_midi2_ep *ep,
struct f_midi2_usb_ep *usb_ep,
void *desc,
void (*complete)(struct usb_ep *usb_ep,
struct usb_request *req))
{
int i;
usb_ep->card = midi2;
usb_ep->ep = ep;
usb_ep->usb_ep = usb_ep_autoconfig(midi2->gadget, desc);
if (!usb_ep->usb_ep)
return -ENODEV;
usb_ep->complete = complete;
usb_ep->reqs = kcalloc(midi2->info.num_reqs, sizeof(*usb_ep->reqs),
GFP_KERNEL);
if (!usb_ep->reqs)
return -ENOMEM;
for (i = 0; i < midi2->info.num_reqs; i++) {
usb_ep->reqs[i].index = i;
usb_ep->reqs[i].usb_ep = usb_ep;
set_bit(i, &usb_ep->free_reqs);
usb_ep->num_reqs++;
}
return 0;
}
/* Free EP */
static void f_midi2_free_ep(struct f_midi2_usb_ep *usb_ep)
{
f_midi2_drop_reqs(usb_ep);
f_midi2_free_ep_reqs(usb_ep);
kfree(usb_ep->reqs);
usb_ep->num_reqs = 0;
usb_ep->free_reqs = 0;
usb_ep->reqs = NULL;
}
/* Queue requests for EP-out at start */
static void f_midi2_queue_out_reqs(struct f_midi2_usb_ep *usb_ep)
{
int i, err;
if (!usb_ep->usb_ep)
return;
for (i = 0; i < usb_ep->num_reqs; i++) {
if (!test_bit(i, &usb_ep->free_reqs) || !usb_ep->reqs[i].req)
continue;
usb_ep->reqs[i].req->complete = usb_ep->complete;
err = usb_ep_queue(usb_ep->usb_ep, usb_ep->reqs[i].req,
GFP_ATOMIC);
if (!err)
clear_bit(i, &usb_ep->free_reqs);
}
}
/*
* Gadget Function callbacks
*/
/* stop both IN and OUT EPs */
static void f_midi2_stop_eps(struct f_midi2_usb_ep *ep_in,
struct f_midi2_usb_ep *ep_out)
{
f_midi2_drop_reqs(ep_in);
f_midi2_drop_reqs(ep_out);
f_midi2_free_ep_reqs(ep_in);
f_midi2_free_ep_reqs(ep_out);
}
/* start/queue both IN and OUT EPs */
static int f_midi2_start_eps(struct f_midi2_usb_ep *ep_in,
struct f_midi2_usb_ep *ep_out,
struct usb_function *fn)
{
int err;
err = f_midi2_start_ep(ep_in, fn);
if (err)
return err;
err = f_midi2_start_ep(ep_out, fn);
if (err)
return err;
err = f_midi2_alloc_ep_reqs(ep_in);
if (err)
return err;
err = f_midi2_alloc_ep_reqs(ep_out);
if (err)
return err;
f_midi2_queue_out_reqs(ep_out);
return 0;
}
/* gadget function set_alt callback */
static int f_midi2_set_alt(struct usb_function *fn, unsigned int intf,
unsigned int alt)
{
struct f_midi2 *midi2 = func_to_midi2(fn);
struct f_midi2_ep *ep;
int i, op_mode, err;
if (intf != midi2->midi_if || alt > 1)
return 0;
if (alt == 0)
op_mode = MIDI_OP_MODE_MIDI1;
else if (alt == 1)
op_mode = MIDI_OP_MODE_MIDI2;
else
op_mode = MIDI_OP_MODE_UNSET;
if (midi2->operation_mode == op_mode)
return 0;
midi2->operation_mode = op_mode;
if (op_mode != MIDI_OP_MODE_MIDI1)
f_midi2_stop_eps(&midi2->midi1_ep_in, &midi2->midi1_ep_out);
if (op_mode != MIDI_OP_MODE_MIDI2) {
for (i = 0; i < midi2->num_eps; i++) {
ep = &midi2->midi2_eps[i];
f_midi2_stop_eps(&ep->ep_in, &ep->ep_out);
}
}
if (op_mode == MIDI_OP_MODE_MIDI1)
return f_midi2_start_eps(&midi2->midi1_ep_in,
&midi2->midi1_ep_out, fn);
if (op_mode == MIDI_OP_MODE_MIDI2) {
for (i = 0; i < midi2->num_eps; i++) {
ep = &midi2->midi2_eps[i];
err = f_midi2_start_eps(&ep->ep_in, &ep->ep_out, fn);
if (err)
return err;
}
}
return 0;
}
/* gadget function get_alt callback */
static int f_midi2_get_alt(struct usb_function *fn, unsigned int intf)
{
struct f_midi2 *midi2 = func_to_midi2(fn);
if (intf == midi2->midi_if &&
midi2->operation_mode == MIDI_OP_MODE_MIDI2)
return 1;
return 0;
}
/* convert UMP direction to USB MIDI 2.0 direction */
static unsigned int ump_to_usb_dir(unsigned int ump_dir)
{
switch (ump_dir) {
case SNDRV_UMP_DIR_INPUT:
return USB_MS_GR_TRM_BLOCK_TYPE_INPUT_ONLY;
case SNDRV_UMP_DIR_OUTPUT:
return USB_MS_GR_TRM_BLOCK_TYPE_OUTPUT_ONLY;
default:
return USB_MS_GR_TRM_BLOCK_TYPE_BIDIRECTIONAL;
}
}
/* assign GTB descriptors (for the given request) */
static void assign_block_descriptors(struct f_midi2 *midi2,
struct usb_request *req,
int max_len)
{
struct usb_ms20_gr_trm_block_header_descriptor header;
struct usb_ms20_gr_trm_block_descriptor *desc;
struct f_midi2_block_info *b;
struct f_midi2_ep *ep;
int i, blk, len;
char *data;
len = sizeof(gtb_header_desc) + sizeof(gtb_desc) * midi2->total_blocks;
if (WARN_ON(len > midi2->info.req_buf_size))
return;
header = gtb_header_desc;
header.wTotalLength = cpu_to_le16(len);
if (max_len < len) {
len = min_t(int, len, sizeof(header));
memcpy(req->buf, &header, len);
req->length = len;
req->zero = len < max_len;
return;
}
memcpy(req->buf, &header, sizeof(header));
data = req->buf + sizeof(header);
for (i = 0; i < midi2->num_eps; i++) {
ep = &midi2->midi2_eps[i];
for (blk = 0; blk < ep->num_blks; blk++) {
b = &ep->blks[blk].info;
desc = (struct usb_ms20_gr_trm_block_descriptor *)data;
*desc = gtb_desc;
desc->bGrpTrmBlkID = ep->blks[blk].gtb_id;
desc->bGrpTrmBlkType = ump_to_usb_dir(b->direction);
desc->nGroupTrm = b->first_group;
desc->nNumGroupTrm = b->num_groups;
desc->iBlockItem = ep->blks[blk].string_id;
if (ep->info.protocol == 2)
desc->bMIDIProtocol = USB_MS_MIDI_PROTO_2_0;
else
desc->bMIDIProtocol = USB_MS_MIDI_PROTO_1_0_128;
if (b->is_midi1 == 2) {
desc->wMaxInputBandwidth = cpu_to_le16(1);
desc->wMaxOutputBandwidth = cpu_to_le16(1);
}
data += sizeof(*desc);
}
}
req->length = len;
req->zero = len < max_len;
}
/* gadget function setup callback: handle GTB requests */
static int f_midi2_setup(struct usb_function *fn,
const struct usb_ctrlrequest *ctrl)
{
struct f_midi2 *midi2 = func_to_midi2(fn);
struct usb_composite_dev *cdev = fn->config->cdev;
struct usb_request *req = cdev->req;
u16 value, length;
if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_STANDARD ||
ctrl->bRequest != USB_REQ_GET_DESCRIPTOR)
return -EOPNOTSUPP;
value = le16_to_cpu(ctrl->wValue);
length = le16_to_cpu(ctrl->wLength);
if ((value >> 8) != USB_DT_CS_GR_TRM_BLOCK)
return -EOPNOTSUPP;
/* handle only altset 1 */
if ((value & 0xff) != 1)
return -EOPNOTSUPP;
assign_block_descriptors(midi2, req, length);
return usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
}
/* gadget function disable callback */
static void f_midi2_disable(struct usb_function *fn)
{
struct f_midi2 *midi2 = func_to_midi2(fn);
midi2->operation_mode = MIDI_OP_MODE_UNSET;
}
/*
* ALSA UMP ops: most of them are NOPs, only trigger for write is needed
*/
static int f_midi2_ump_open(struct snd_ump_endpoint *ump, int dir)
{
return 0;
}
static void f_midi2_ump_close(struct snd_ump_endpoint *ump, int dir)
{
}
static void f_midi2_ump_trigger(struct snd_ump_endpoint *ump, int dir, int up)
{
struct f_midi2_ep *ep = ump->private_data;
struct f_midi2 *midi2 = ep->card;
if (up && dir == SNDRV_RAWMIDI_STREAM_OUTPUT) {
switch (midi2->operation_mode) {
case MIDI_OP_MODE_MIDI1:
process_midi1_transmit(midi2);
break;
case MIDI_OP_MODE_MIDI2:
process_ump_transmit(ep);
break;
}
}
}
static void f_midi2_ump_drain(struct snd_ump_endpoint *ump, int dir)
{
}
static const struct snd_ump_ops f_midi2_ump_ops = {
.open = f_midi2_ump_open,
.close = f_midi2_ump_close,
.trigger = f_midi2_ump_trigger,
.drain = f_midi2_ump_drain,
};
/*
* "Operation Mode" control element
*/
static int f_midi2_operation_mode_info(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_info *uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->count = 1;
uinfo->value.integer.min = MIDI_OP_MODE_UNSET;
uinfo->value.integer.max = MIDI_OP_MODE_MIDI2;
return 0;
}
static int f_midi2_operation_mode_get(struct snd_kcontrol *kcontrol,
struct snd_ctl_elem_value *ucontrol)
{
struct f_midi2 *midi2 = snd_kcontrol_chip(kcontrol);
ucontrol->value.integer.value[0] = midi2->operation_mode;
return 0;
}
static const struct snd_kcontrol_new operation_mode_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_RAWMIDI,
.name = "Operation Mode",
.access = SNDRV_CTL_ELEM_ACCESS_READ | SNDRV_CTL_ELEM_ACCESS_VOLATILE,
.info = f_midi2_operation_mode_info,
.get = f_midi2_operation_mode_get,
};
/*
* ALSA UMP instance creation / deletion
*/
static void f_midi2_free_card(struct f_midi2 *midi2)
{
if (midi2->card) {
snd_card_free_when_closed(midi2->card);
midi2->card = NULL;
}
}
/* use a reverse direction for the gadget host */
static int reverse_dir(int dir)
{
if (!dir || dir == SNDRV_UMP_DIR_BIDIRECTION)
return dir;
return (dir == SNDRV_UMP_DIR_OUTPUT) ?
SNDRV_UMP_DIR_INPUT : SNDRV_UMP_DIR_OUTPUT;
}
static int f_midi2_create_card(struct f_midi2 *midi2)
{
struct snd_card *card;
struct snd_ump_endpoint *ump;
struct f_midi2_ep *ep;
int i, id, blk, err;
__be32 sw;
err = snd_card_new(&midi2->gadget->dev, -1, NULL, THIS_MODULE, 0,
&card);
if (err < 0)
return err;
midi2->card = card;
strcpy(card->driver, "f_midi2");
strcpy(card->shortname, "MIDI 2.0 Gadget");
strcpy(card->longname, "MIDI 2.0 Gadget");
id = 0;
for (i = 0; i < midi2->num_eps; i++) {
ep = &midi2->midi2_eps[i];
err = snd_ump_endpoint_new(card, "MIDI 2.0 Gadget", id,
1, 1, &ump);
if (err < 0)
goto error;
id++;
ep->ump = ump;
ump->no_process_stream = true;
ump->private_data = ep;
ump->ops = &f_midi2_ump_ops;
if (midi2->info.static_block)
ump->info.flags |= SNDRV_UMP_EP_INFO_STATIC_BLOCKS;
ump->info.protocol_caps = (ep->info.protocol_caps & 3) << 8;
ump->info.protocol = to_ump_protocol(ep->info.protocol);
ump->info.version = 0x0101;
ump->info.family_id = ep->info.family;
ump->info.model_id = ep->info.model;
ump->info.manufacturer_id = ep->info.manufacturer & 0xffffff;
sw = cpu_to_be32(ep->info.sw_revision);
memcpy(ump->info.sw_revision, &sw, 4);
strscpy(ump->info.name, ump_ep_name(ep),
sizeof(ump->info.name));
strscpy(ump->info.product_id, ump_product_id(ep),
sizeof(ump->info.product_id));
strscpy(ump->core.name, ump->info.name, sizeof(ump->core.name));
for (blk = 0; blk < ep->num_blks; blk++) {
const struct f_midi2_block_info *b = &ep->blks[blk].info;
struct snd_ump_block *fb;
err = snd_ump_block_new(ump, blk,
reverse_dir(b->direction),
b->first_group, b->num_groups,
&ep->blks[blk].fb);
if (err < 0)
goto error;
fb = ep->blks[blk].fb;
fb->info.active = !!b->active;
fb->info.midi_ci_version = b->midi_ci_version;
fb->info.ui_hint = reverse_dir(b->ui_hint);
fb->info.sysex8_streams = b->sysex8_streams;
fb->info.flags |= b->is_midi1;
strscpy(fb->info.name, ump_fb_name(b),
sizeof(fb->info.name));
}
}
for (i = 0; i < midi2->num_eps; i++) {
err = snd_ump_attach_legacy_rawmidi(midi2->midi2_eps[i].ump,
"Legacy MIDI", id);
if (err < 0)
goto error;
id++;
}
err = snd_ctl_add(card, snd_ctl_new1(&operation_mode_ctl, midi2));
if (err < 0)
goto error;
err = snd_card_register(card);
if (err < 0)
goto error;
return 0;
error:
f_midi2_free_card(midi2);
return err;
}
/*
* Creation of USB descriptors
*/
struct f_midi2_usb_config {
struct usb_descriptor_header **list;
unsigned int size;
unsigned int alloc;
/* MIDI 1.0 jacks */
unsigned char jack_in, jack_out, jack_id;
struct usb_midi_in_jack_descriptor jack_ins[MAX_CABLES];
struct usb_midi_out_jack_descriptor_1 jack_outs[MAX_CABLES];
};
static int append_config(struct f_midi2_usb_config *config, void *d)
{
unsigned int size;
void *buf;
if (config->size + 2 >= config->alloc) {
size = config->size + 16;
buf = krealloc(config->list, size * sizeof(void *), GFP_KERNEL);
if (!buf)
return -ENOMEM;
config->list = buf;
config->alloc = size;
}
config->list[config->size] = d;
config->size++;
config->list[config->size] = NULL;
return 0;
}
static int append_configs(struct f_midi2_usb_config *config, void **d)
{
int err;
for (; *d; d++) {
err = append_config(config, *d);
if (err)
return err;
}
return 0;
}
static int append_midi1_in_jack(struct f_midi2 *midi2,
struct f_midi2_usb_config *config,
struct midi1_cable_mapping *map,
unsigned int type)
{
struct usb_midi_in_jack_descriptor *jack =
&config->jack_ins[config->jack_in++];
int id = ++config->jack_id;
int err;
jack->bLength = 0x06;
jack->bDescriptorType = USB_DT_CS_INTERFACE;
jack->bDescriptorSubtype = USB_MS_MIDI_IN_JACK;
jack->bJackType = type;
jack->bJackID = id;
/* use the corresponding block name as jack name */
if (map->ep)
jack->iJack = map->ep->blks[map->block].string_id;
err = append_config(config, jack);
if (err < 0)
return err;
return id;
}
static int append_midi1_out_jack(struct f_midi2 *midi2,
struct f_midi2_usb_config *config,
struct midi1_cable_mapping *map,
unsigned int type, unsigned int source)
{
struct usb_midi_out_jack_descriptor_1 *jack =
&config->jack_outs[config->jack_out++];
int id = ++config->jack_id;
int err;
jack->bLength = 0x09;
jack->bDescriptorType = USB_DT_CS_INTERFACE;
jack->bDescriptorSubtype = USB_MS_MIDI_OUT_JACK;
jack->bJackType = type;
jack->bJackID = id;
jack->bNrInputPins = 1;
jack->pins[0].baSourceID = source;
jack->pins[0].baSourcePin = 0x01;
/* use the corresponding block name as jack name */
if (map->ep)
jack->iJack = map->ep->blks[map->block].string_id;
err = append_config(config, jack);
if (err < 0)
return err;
return id;
}
static int f_midi2_create_usb_configs(struct f_midi2 *midi2,
struct f_midi2_usb_config *config,
int speed)
{
void **midi1_in_eps, **midi1_out_eps;
int i, jack, total;
int err;
switch (speed) {
default:
case USB_SPEED_HIGH:
midi2_midi1_ep_out_desc.wMaxPacketSize = cpu_to_le16(512);
midi2_midi1_ep_in_desc.wMaxPacketSize = cpu_to_le16(512);
for (i = 0; i < midi2->num_eps; i++)
midi2_midi2_ep_out_desc[i].wMaxPacketSize =
cpu_to_le16(512);
fallthrough;
case USB_SPEED_FULL:
midi1_in_eps = midi2_midi1_ep_in_descs;
midi1_out_eps = midi2_midi1_ep_out_descs;
break;
case USB_SPEED_SUPER:
midi2_midi1_ep_out_desc.wMaxPacketSize = cpu_to_le16(1024);
midi2_midi1_ep_in_desc.wMaxPacketSize = cpu_to_le16(1024);
for (i = 0; i < midi2->num_eps; i++)
midi2_midi2_ep_out_desc[i].wMaxPacketSize =
cpu_to_le16(1024);
midi1_in_eps = midi2_midi1_ep_in_ss_descs;
midi1_out_eps = midi2_midi1_ep_out_ss_descs;
break;
}
err = append_configs(config, midi2_audio_descs);
if (err < 0)
return err;
if (midi2->num_midi1_in && midi2->num_midi1_out)
midi2_midi1_if_desc.bNumEndpoints = 2;
else
midi2_midi1_if_desc.bNumEndpoints = 1;
err = append_configs(config, midi2_midi1_descs);
if (err < 0)
return err;
total = USB_DT_MS_HEADER_SIZE;
if (midi2->num_midi1_out) {
midi2_midi1_ep_out_class_desc.bLength =
USB_DT_MS_ENDPOINT_SIZE(midi2->num_midi1_out);
total += midi2_midi1_ep_out_class_desc.bLength;
midi2_midi1_ep_out_class_desc.bNumEmbMIDIJack =
midi2->num_midi1_out;
total += midi2->num_midi1_out *
(USB_DT_MIDI_IN_SIZE + USB_DT_MIDI_OUT_SIZE(1));
for (i = 0; i < midi2->num_midi1_out; i++) {
jack = append_midi1_in_jack(midi2, config,
&midi2->in_cable_mapping[i],
USB_MS_EMBEDDED);
if (jack < 0)
return jack;
midi2_midi1_ep_out_class_desc.baAssocJackID[i] = jack;
jack = append_midi1_out_jack(midi2, config,
&midi2->in_cable_mapping[i],
USB_MS_EXTERNAL, jack);
if (jack < 0)
return jack;
}
}
if (midi2->num_midi1_in) {
midi2_midi1_ep_in_class_desc.bLength =
USB_DT_MS_ENDPOINT_SIZE(midi2->num_midi1_in);
total += midi2_midi1_ep_in_class_desc.bLength;
midi2_midi1_ep_in_class_desc.bNumEmbMIDIJack =
midi2->num_midi1_in;
total += midi2->num_midi1_in *
(USB_DT_MIDI_IN_SIZE + USB_DT_MIDI_OUT_SIZE(1));
for (i = 0; i < midi2->num_midi1_in; i++) {
jack = append_midi1_in_jack(midi2, config,
&midi2->out_cable_mapping[i],
USB_MS_EXTERNAL);
if (jack < 0)
return jack;
jack = append_midi1_out_jack(midi2, config,
&midi2->out_cable_mapping[i],
USB_MS_EMBEDDED, jack);
if (jack < 0)
return jack;
midi2_midi1_ep_in_class_desc.baAssocJackID[i] = jack;
}
}
midi2_midi1_class_desc.wTotalLength = cpu_to_le16(total);
if (midi2->num_midi1_out) {
err = append_configs(config, midi1_out_eps);
if (err < 0)
return err;
}
if (midi2->num_midi1_in) {
err = append_configs(config, midi1_in_eps);
if (err < 0)
return err;
}
err = append_configs(config, midi2_midi2_descs);
if (err < 0)
return err;
for (i = 0; i < midi2->num_eps; i++) {
err = append_config(config, &midi2_midi2_ep_out_desc[i]);
if (err < 0)
return err;
if (speed == USB_SPEED_SUPER || speed == USB_SPEED_SUPER_PLUS) {
err = append_config(config, &midi2_midi2_ep_out_ss_comp_desc);
if (err < 0)
return err;
}
err = append_config(config, &midi2_midi2_ep_out_class_desc[i]);
if (err < 0)
return err;
err = append_config(config, &midi2_midi2_ep_in_desc[i]);
if (err < 0)
return err;
if (speed == USB_SPEED_SUPER || speed == USB_SPEED_SUPER_PLUS) {
err = append_config(config, &midi2_midi2_ep_in_ss_comp_desc);
if (err < 0)
return err;
}
err = append_config(config, &midi2_midi2_ep_in_class_desc[i]);
if (err < 0)
return err;
}
return 0;
}
static void f_midi2_free_usb_configs(struct f_midi2_usb_config *config)
{
kfree(config->list);
memset(config, 0, sizeof(*config));
}
/* as we use the static descriptors for simplicity, serialize bind call */
static DEFINE_MUTEX(f_midi2_desc_mutex);
/* fill MIDI2 EP class-specific descriptor */
static void fill_midi2_class_desc(struct f_midi2_ep *ep,
struct usb_ms20_endpoint_descriptor_32 *cdesc)
{
int blk;
cdesc->bLength = USB_DT_MS20_ENDPOINT_SIZE(ep->num_blks);
cdesc->bDescriptorType = USB_DT_CS_ENDPOINT;
cdesc->bDescriptorSubtype = USB_MS_GENERAL_2_0;
cdesc->bNumGrpTrmBlock = ep->num_blks;
for (blk = 0; blk < ep->num_blks; blk++)
cdesc->baAssoGrpTrmBlkID[blk] = ep->blks[blk].gtb_id;
}
/* initialize MIDI2 EP-in */
static int f_midi2_init_midi2_ep_in(struct f_midi2 *midi2, int index)
{
struct f_midi2_ep *ep = &midi2->midi2_eps[index];
struct usb_endpoint_descriptor *desc = &midi2_midi2_ep_in_desc[index];
desc->bLength = USB_DT_ENDPOINT_SIZE;
desc->bDescriptorType = USB_DT_ENDPOINT;
desc->bEndpointAddress = USB_DIR_IN;
desc->bmAttributes = USB_ENDPOINT_XFER_INT;
desc->wMaxPacketSize = cpu_to_le16(EP_MAX_PACKET_INT);
desc->bInterval = 1;
fill_midi2_class_desc(ep, &midi2_midi2_ep_in_class_desc[index]);
return f_midi2_init_ep(midi2, ep, &ep->ep_in, desc,
f_midi2_ep_in_complete);
}
/* initialize MIDI2 EP-out */
static int f_midi2_init_midi2_ep_out(struct f_midi2 *midi2, int index)
{
struct f_midi2_ep *ep = &midi2->midi2_eps[index];
struct usb_endpoint_descriptor *desc = &midi2_midi2_ep_out_desc[index];
desc->bLength = USB_DT_ENDPOINT_SIZE;
desc->bDescriptorType = USB_DT_ENDPOINT;
desc->bEndpointAddress = USB_DIR_OUT;
desc->bmAttributes = USB_ENDPOINT_XFER_BULK;
fill_midi2_class_desc(ep, &midi2_midi2_ep_out_class_desc[index]);
return f_midi2_init_ep(midi2, ep, &ep->ep_out, desc,
f_midi2_ep_out_complete);
}
/* gadget function bind callback */
static int f_midi2_bind(struct usb_configuration *c, struct usb_function *f)
{
struct usb_composite_dev *cdev = c->cdev;
struct f_midi2 *midi2 = func_to_midi2(f);
struct f_midi2_ep *ep;
struct f_midi2_usb_config config = {};
struct usb_gadget_strings string_fn = {
.language = 0x0409, /* en-us */
.strings = midi2->string_defs,
};
struct usb_gadget_strings *strings[] = {
&string_fn,
NULL,
};
int i, blk, status;
midi2->gadget = cdev->gadget;
midi2->operation_mode = MIDI_OP_MODE_UNSET;
status = f_midi2_create_card(midi2);
if (status < 0)
goto fail_register;
/* maybe allocate device-global string ID */
midi2->strings = usb_gstrings_attach(c->cdev, strings,
midi2->total_blocks + 1);
if (IS_ERR(midi2->strings)) {
status = PTR_ERR(midi2->strings);
goto fail_string;
}
mutex_lock(&f_midi2_desc_mutex);
midi2_midi1_if_desc.iInterface = midi2->strings[STR_IFACE].id;
midi2_midi2_if_desc.iInterface = midi2->strings[STR_IFACE].id;
for (i = 0; i < midi2->num_eps; i++) {
ep = &midi2->midi2_eps[i];
for (blk = 0; blk < ep->num_blks; blk++)
ep->blks[blk].string_id =
midi2->strings[gtb_to_str_id(ep->blks[blk].gtb_id)].id;
}
midi2_midi2_if_desc.bNumEndpoints = midi2->num_eps * 2;
/* audio interface */
status = usb_interface_id(c, f);
if (status < 0)
goto fail;
midi2_audio_if_desc.bInterfaceNumber = status;
/* MIDI streaming */
status = usb_interface_id(c, f);
if (status < 0)
goto fail;
midi2->midi_if = status;
midi2_midi1_if_desc.bInterfaceNumber = status;
midi2_midi2_if_desc.bInterfaceNumber = status;
midi2_audio_class_desc.baInterfaceNr[0] = status;
/* allocate instance-specific endpoints */
if (midi2->midi2_eps[0].blks[0].info.direction != SNDRV_UMP_DIR_OUTPUT) {
status = f_midi2_init_ep(midi2, NULL, &midi2->midi1_ep_in,
&midi2_midi1_ep_in_desc,
f_midi2_midi1_ep_in_complete);
if (status)
goto fail;
}
if (midi2->midi2_eps[0].blks[0].info.direction != SNDRV_UMP_DIR_INPUT) {
status = f_midi2_init_ep(midi2, NULL, &midi2->midi1_ep_out,
&midi2_midi1_ep_out_desc,
f_midi2_midi1_ep_out_complete);
if (status)
goto fail;
}
for (i = 0; i < midi2->num_eps; i++) {
status = f_midi2_init_midi2_ep_in(midi2, i);
if (status)
goto fail;
status = f_midi2_init_midi2_ep_out(midi2, i);
if (status)
goto fail;
}
status = f_midi2_create_usb_configs(midi2, &config, USB_SPEED_FULL);
if (status < 0)
goto fail;
f->fs_descriptors = usb_copy_descriptors(config.list);
if (!f->fs_descriptors) {
status = -ENOMEM;
goto fail;
}
f_midi2_free_usb_configs(&config);
status = f_midi2_create_usb_configs(midi2, &config, USB_SPEED_HIGH);
if (status < 0)
goto fail;
f->hs_descriptors = usb_copy_descriptors(config.list);
if (!f->hs_descriptors) {
status = -ENOMEM;
goto fail;
}
f_midi2_free_usb_configs(&config);
status = f_midi2_create_usb_configs(midi2, &config, USB_SPEED_SUPER);
if (status < 0)
goto fail;
f->ss_descriptors = usb_copy_descriptors(config.list);
if (!f->ss_descriptors) {
status = -ENOMEM;
goto fail;
}
f_midi2_free_usb_configs(&config);
mutex_unlock(&f_midi2_desc_mutex);
return 0;
fail:
f_midi2_free_usb_configs(&config);
mutex_unlock(&f_midi2_desc_mutex);
usb_free_all_descriptors(f);
fail_string:
f_midi2_free_card(midi2);
fail_register:
ERROR(midi2, "%s: can't bind, err %d\n", f->name, status);
return status;
}
/* gadget function unbind callback */
static void f_midi2_unbind(struct usb_configuration *c, struct usb_function *f)
{
struct f_midi2 *midi2 = func_to_midi2(f);
int i;
f_midi2_free_card(midi2);
f_midi2_free_ep(&midi2->midi1_ep_in);
f_midi2_free_ep(&midi2->midi1_ep_out);
for (i = 0; i < midi2->num_eps; i++) {
f_midi2_free_ep(&midi2->midi2_eps[i].ep_in);
f_midi2_free_ep(&midi2->midi2_eps[i].ep_out);
}
usb_free_all_descriptors(f);
}
/*
* ConfigFS interface
*/
/* type conversion helpers */
static inline struct f_midi2_opts *to_f_midi2_opts(struct config_item *item)
{
return container_of(to_config_group(item), struct f_midi2_opts,
func_inst.group);
}
static inline struct f_midi2_ep_opts *
to_f_midi2_ep_opts(struct config_item *item)
{
return container_of(to_config_group(item), struct f_midi2_ep_opts,
group);
}
static inline struct f_midi2_block_opts *
to_f_midi2_block_opts(struct config_item *item)
{
return container_of(to_config_group(item), struct f_midi2_block_opts,
group);
}
/* trim the string to be usable for EP and FB name strings */
static void make_name_string(char *s)
{
char *p;
p = strchr(s, '\n');
if (p)
*p = 0;
p = s + strlen(s);
for (; p > s && isspace(*p); p--)
*p = 0;
}
/* configfs helpers: generic show/store for unisnged int */
static ssize_t f_midi2_opts_uint_show(struct f_midi2_opts *opts,
u32 val, const char *format, char *page)
{
int result;
mutex_lock(&opts->lock);
result = sprintf(page, format, val);
mutex_unlock(&opts->lock);
return result;
}
static ssize_t f_midi2_opts_uint_store(struct f_midi2_opts *opts,
u32 *valp, u32 minval, u32 maxval,
const char *page, size_t len)
{
int ret;
u32 val;
mutex_lock(&opts->lock);
if (opts->refcnt) {
ret = -EBUSY;
goto end;
}
ret = kstrtou32(page, 0, &val);
if (ret)
goto end;
if (val < minval || val > maxval) {
ret = -EINVAL;
goto end;
}
*valp = val;
ret = len;
end:
mutex_unlock(&opts->lock);
return ret;
}
/* generic store for bool */
static ssize_t f_midi2_opts_bool_store(struct f_midi2_opts *opts,
bool *valp, const char *page, size_t len)
{
int ret;
bool val;
mutex_lock(&opts->lock);
if (opts->refcnt) {
ret = -EBUSY;
goto end;
}
ret = kstrtobool(page, &val);
if (ret)
goto end;
*valp = val;
ret = len;
end:
mutex_unlock(&opts->lock);
return ret;
}
/* generic show/store for string */
static ssize_t f_midi2_opts_str_show(struct f_midi2_opts *opts,
const char *str, char *page)
{
int result = 0;
mutex_lock(&opts->lock);
if (str)
result = scnprintf(page, PAGE_SIZE, "%s\n", str);
mutex_unlock(&opts->lock);
return result;
}
static ssize_t f_midi2_opts_str_store(struct f_midi2_opts *opts,
const char **strp, size_t maxlen,
const char *page, size_t len)
{
char *c;
int ret;
mutex_lock(&opts->lock);
if (opts->refcnt) {
ret = -EBUSY;
goto end;
}
c = kstrndup(page, min(len, maxlen), GFP_KERNEL);
if (!c) {
ret = -ENOMEM;
goto end;
}
kfree(*strp);
make_name_string(c);
*strp = c;
ret = len;
end:
mutex_unlock(&opts->lock);
return ret;
}
/*
* Definitions for UMP Block config
*/
/* define an uint option for block */
#define F_MIDI2_BLOCK_OPT(name, format, minval, maxval) \
static ssize_t f_midi2_block_opts_##name##_show(struct config_item *item,\
char *page) \
{ \
struct f_midi2_block_opts *opts = to_f_midi2_block_opts(item); \
return f_midi2_opts_uint_show(opts->ep->opts, opts->info.name, \
format "\n", page); \
} \
\
static ssize_t f_midi2_block_opts_##name##_store(struct config_item *item,\
const char *page, size_t len) \
{ \
struct f_midi2_block_opts *opts = to_f_midi2_block_opts(item); \
return f_midi2_opts_uint_store(opts->ep->opts, &opts->info.name,\
minval, maxval, page, len); \
} \
\
CONFIGFS_ATTR(f_midi2_block_opts_, name)
/* define a boolean option for block */
#define F_MIDI2_BLOCK_BOOL_OPT(name) \
static ssize_t f_midi2_block_opts_##name##_show(struct config_item *item,\
char *page) \
{ \
struct f_midi2_block_opts *opts = to_f_midi2_block_opts(item); \
return f_midi2_opts_uint_show(opts->ep->opts, opts->info.name, \
"%u\n", page); \
} \
\
static ssize_t f_midi2_block_opts_##name##_store(struct config_item *item,\
const char *page, size_t len) \
{ \
struct f_midi2_block_opts *opts = to_f_midi2_block_opts(item); \
return f_midi2_opts_bool_store(opts->ep->opts, &opts->info.name,\
page, len); \
} \
\
CONFIGFS_ATTR(f_midi2_block_opts_, name)
F_MIDI2_BLOCK_OPT(direction, "0x%x", 1, 3);
F_MIDI2_BLOCK_OPT(first_group, "0x%x", 0, 15);
F_MIDI2_BLOCK_OPT(num_groups, "0x%x", 1, 16);
F_MIDI2_BLOCK_OPT(midi1_first_group, "0x%x", 0, 15);
F_MIDI2_BLOCK_OPT(midi1_num_groups, "0x%x", 0, 16);
F_MIDI2_BLOCK_OPT(ui_hint, "0x%x", 0, 3);
F_MIDI2_BLOCK_OPT(midi_ci_version, "%u", 0, 1);
F_MIDI2_BLOCK_OPT(sysex8_streams, "%u", 0, 255);
F_MIDI2_BLOCK_OPT(is_midi1, "%u", 0, 2);
F_MIDI2_BLOCK_BOOL_OPT(active);
static ssize_t f_midi2_block_opts_name_show(struct config_item *item,
char *page)
{
struct f_midi2_block_opts *opts = to_f_midi2_block_opts(item);
return f_midi2_opts_str_show(opts->ep->opts, opts->info.name, page);
}
static ssize_t f_midi2_block_opts_name_store(struct config_item *item,
const char *page, size_t len)
{
struct f_midi2_block_opts *opts = to_f_midi2_block_opts(item);
return f_midi2_opts_str_store(opts->ep->opts, &opts->info.name, 128,
page, len);
}
CONFIGFS_ATTR(f_midi2_block_opts_, name);
static struct configfs_attribute *f_midi2_block_attrs[] = {
&f_midi2_block_opts_attr_direction,
&f_midi2_block_opts_attr_first_group,
&f_midi2_block_opts_attr_num_groups,
&f_midi2_block_opts_attr_midi1_first_group,
&f_midi2_block_opts_attr_midi1_num_groups,
&f_midi2_block_opts_attr_ui_hint,
&f_midi2_block_opts_attr_midi_ci_version,
&f_midi2_block_opts_attr_sysex8_streams,
&f_midi2_block_opts_attr_is_midi1,
&f_midi2_block_opts_attr_active,
&f_midi2_block_opts_attr_name,
NULL,
};
static void f_midi2_block_opts_release(struct config_item *item)
{
struct f_midi2_block_opts *opts = to_f_midi2_block_opts(item);
kfree(opts->info.name);
kfree(opts);
}
static struct configfs_item_operations f_midi2_block_item_ops = {
.release = f_midi2_block_opts_release,
};
static const struct config_item_type f_midi2_block_type = {
.ct_item_ops = &f_midi2_block_item_ops,
.ct_attrs = f_midi2_block_attrs,
.ct_owner = THIS_MODULE,
};
/* create a f_midi2_block_opts instance for the given block number */
static int f_midi2_block_opts_create(struct f_midi2_ep_opts *ep_opts,
unsigned int blk,
struct f_midi2_block_opts **block_p)
{
struct f_midi2_block_opts *block_opts;
int ret = 0;
mutex_lock(&ep_opts->opts->lock);
if (ep_opts->opts->refcnt || ep_opts->blks[blk]) {
ret = -EBUSY;
goto out;
}
block_opts = kzalloc(sizeof(*block_opts), GFP_KERNEL);
if (!block_opts) {
ret = -ENOMEM;
goto out;
}
block_opts->ep = ep_opts;
block_opts->id = blk;
/* set up the default values */
block_opts->info.direction = SNDRV_UMP_DIR_BIDIRECTION;
block_opts->info.first_group = 0;
block_opts->info.num_groups = 1;
block_opts->info.ui_hint = SNDRV_UMP_BLOCK_UI_HINT_BOTH;
block_opts->info.active = 1;
ep_opts->blks[blk] = block_opts;
*block_p = block_opts;
out:
mutex_unlock(&ep_opts->opts->lock);
return ret;
}
/* make_group callback for a block */
static struct config_group *
f_midi2_opts_block_make(struct config_group *group, const char *name)
{
struct f_midi2_ep_opts *ep_opts;
struct f_midi2_block_opts *block_opts;
unsigned int blk;
int ret;
if (strncmp(name, "block.", 6))
return ERR_PTR(-EINVAL);
ret = kstrtouint(name + 6, 10, &blk);
if (ret)
return ERR_PTR(ret);
ep_opts = to_f_midi2_ep_opts(&group->cg_item);
if (blk >= SNDRV_UMP_MAX_BLOCKS)
return ERR_PTR(-EINVAL);
if (ep_opts->blks[blk])
return ERR_PTR(-EBUSY);
ret = f_midi2_block_opts_create(ep_opts, blk, &block_opts);
if (ret)
return ERR_PTR(ret);
config_group_init_type_name(&block_opts->group, name,
&f_midi2_block_type);
return &block_opts->group;
}
/* drop_item callback for a block */
static void
f_midi2_opts_block_drop(struct config_group *group, struct config_item *item)
{
struct f_midi2_block_opts *block_opts = to_f_midi2_block_opts(item);
mutex_lock(&block_opts->ep->opts->lock);
block_opts->ep->blks[block_opts->id] = NULL;
mutex_unlock(&block_opts->ep->opts->lock);
config_item_put(item);
}
/*
* Definitions for UMP Endpoint config
*/
/* define an uint option for EP */
#define F_MIDI2_EP_OPT(name, format, minval, maxval) \
static ssize_t f_midi2_ep_opts_##name##_show(struct config_item *item, \
char *page) \
{ \
struct f_midi2_ep_opts *opts = to_f_midi2_ep_opts(item); \
return f_midi2_opts_uint_show(opts->opts, opts->info.name, \
format "\n", page); \
} \
\
static ssize_t f_midi2_ep_opts_##name##_store(struct config_item *item, \
const char *page, size_t len)\
{ \
struct f_midi2_ep_opts *opts = to_f_midi2_ep_opts(item); \
return f_midi2_opts_uint_store(opts->opts, &opts->info.name, \
minval, maxval, page, len); \
} \
\
CONFIGFS_ATTR(f_midi2_ep_opts_, name)
/* define a string option for EP */
#define F_MIDI2_EP_STR_OPT(name, maxlen) \
static ssize_t f_midi2_ep_opts_##name##_show(struct config_item *item, \
char *page) \
{ \
struct f_midi2_ep_opts *opts = to_f_midi2_ep_opts(item); \
return f_midi2_opts_str_show(opts->opts, opts->info.name, page);\
} \
\
static ssize_t f_midi2_ep_opts_##name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
struct f_midi2_ep_opts *opts = to_f_midi2_ep_opts(item); \
return f_midi2_opts_str_store(opts->opts, &opts->info.name, maxlen,\
page, len); \
} \
\
CONFIGFS_ATTR(f_midi2_ep_opts_, name)
F_MIDI2_EP_OPT(protocol, "0x%x", 1, 2);
F_MIDI2_EP_OPT(protocol_caps, "0x%x", 1, 3);
F_MIDI2_EP_OPT(manufacturer, "0x%x", 0, 0xffffff);
F_MIDI2_EP_OPT(family, "0x%x", 0, 0xffff);
F_MIDI2_EP_OPT(model, "0x%x", 0, 0xffff);
F_MIDI2_EP_OPT(sw_revision, "0x%x", 0, 0xffffffff);
F_MIDI2_EP_STR_OPT(ep_name, 128);
F_MIDI2_EP_STR_OPT(product_id, 128);
static struct configfs_attribute *f_midi2_ep_attrs[] = {
&f_midi2_ep_opts_attr_protocol,
&f_midi2_ep_opts_attr_protocol_caps,
&f_midi2_ep_opts_attr_ep_name,
&f_midi2_ep_opts_attr_product_id,
&f_midi2_ep_opts_attr_manufacturer,
&f_midi2_ep_opts_attr_family,
&f_midi2_ep_opts_attr_model,
&f_midi2_ep_opts_attr_sw_revision,
NULL,
};
static void f_midi2_ep_opts_release(struct config_item *item)
{
struct f_midi2_ep_opts *opts = to_f_midi2_ep_opts(item);
kfree(opts->info.ep_name);
kfree(opts->info.product_id);
kfree(opts);
}
static struct configfs_item_operations f_midi2_ep_item_ops = {
.release = f_midi2_ep_opts_release,
};
static struct configfs_group_operations f_midi2_ep_group_ops = {
.make_group = f_midi2_opts_block_make,
.drop_item = f_midi2_opts_block_drop,
};
static const struct config_item_type f_midi2_ep_type = {
.ct_item_ops = &f_midi2_ep_item_ops,
.ct_group_ops = &f_midi2_ep_group_ops,
.ct_attrs = f_midi2_ep_attrs,
.ct_owner = THIS_MODULE,
};
/* create a f_midi2_ep_opts instance */
static int f_midi2_ep_opts_create(struct f_midi2_opts *opts,
unsigned int index,
struct f_midi2_ep_opts **ep_p)
{
struct f_midi2_ep_opts *ep_opts;
ep_opts = kzalloc(sizeof(*ep_opts), GFP_KERNEL);
if (!ep_opts)
return -ENOMEM;
ep_opts->opts = opts;
ep_opts->index = index;
/* set up the default values */
ep_opts->info.protocol = 2;
ep_opts->info.protocol_caps = 3;
opts->eps[index] = ep_opts;
*ep_p = ep_opts;
return 0;
}
/* make_group callback for an EP */
static struct config_group *
f_midi2_opts_ep_make(struct config_group *group, const char *name)
{
struct f_midi2_opts *opts;
struct f_midi2_ep_opts *ep_opts;
unsigned int index;
int ret;
if (strncmp(name, "ep.", 3))
return ERR_PTR(-EINVAL);
ret = kstrtouint(name + 3, 10, &index);
if (ret)
return ERR_PTR(ret);
opts = to_f_midi2_opts(&group->cg_item);
if (index >= MAX_UMP_EPS)
return ERR_PTR(-EINVAL);
if (opts->eps[index])
return ERR_PTR(-EBUSY);
ret = f_midi2_ep_opts_create(opts, index, &ep_opts);
if (ret)
return ERR_PTR(ret);
config_group_init_type_name(&ep_opts->group, name, &f_midi2_ep_type);
return &ep_opts->group;
}
/* drop_item callback for an EP */
static void
f_midi2_opts_ep_drop(struct config_group *group, struct config_item *item)
{
struct f_midi2_ep_opts *ep_opts = to_f_midi2_ep_opts(item);
mutex_lock(&ep_opts->opts->lock);
ep_opts->opts->eps[ep_opts->index] = NULL;
mutex_unlock(&ep_opts->opts->lock);
config_item_put(item);
}
/*
* Definitions for card config
*/
/* define a bool option for card */
#define F_MIDI2_BOOL_OPT(name) \
static ssize_t f_midi2_opts_##name##_show(struct config_item *item, \
char *page) \
{ \
struct f_midi2_opts *opts = to_f_midi2_opts(item); \
return f_midi2_opts_uint_show(opts, opts->info.name, \
"%u\n", page); \
} \
\
static ssize_t f_midi2_opts_##name##_store(struct config_item *item, \
const char *page, size_t len) \
{ \
struct f_midi2_opts *opts = to_f_midi2_opts(item); \
return f_midi2_opts_bool_store(opts, &opts->info.name, \
page, len); \
} \
\
CONFIGFS_ATTR(f_midi2_opts_, name)
F_MIDI2_BOOL_OPT(process_ump);
F_MIDI2_BOOL_OPT(static_block);
static ssize_t f_midi2_opts_iface_name_show(struct config_item *item,
char *page)
{
struct f_midi2_opts *opts = to_f_midi2_opts(item);
return f_midi2_opts_str_show(opts, opts->info.iface_name, page);
}
static ssize_t f_midi2_opts_iface_name_store(struct config_item *item,
const char *page, size_t len)
{
struct f_midi2_opts *opts = to_f_midi2_opts(item);
return f_midi2_opts_str_store(opts, &opts->info.iface_name, 128,
page, len);
}
CONFIGFS_ATTR(f_midi2_opts_, iface_name);
static struct configfs_attribute *f_midi2_attrs[] = {
&f_midi2_opts_attr_process_ump,
&f_midi2_opts_attr_static_block,
&f_midi2_opts_attr_iface_name,
NULL
};
static void f_midi2_opts_release(struct config_item *item)
{
struct f_midi2_opts *opts = to_f_midi2_opts(item);
usb_put_function_instance(&opts->func_inst);
}
static struct configfs_item_operations f_midi2_item_ops = {
.release = f_midi2_opts_release,
};
static struct configfs_group_operations f_midi2_group_ops = {
.make_group = f_midi2_opts_ep_make,
.drop_item = f_midi2_opts_ep_drop,
};
static const struct config_item_type f_midi2_func_type = {
.ct_item_ops = &f_midi2_item_ops,
.ct_group_ops = &f_midi2_group_ops,
.ct_attrs = f_midi2_attrs,
.ct_owner = THIS_MODULE,
};
static void f_midi2_free_inst(struct usb_function_instance *f)
{
struct f_midi2_opts *opts;
opts = container_of(f, struct f_midi2_opts, func_inst);
kfree(opts->info.iface_name);
kfree(opts);
}
/* gadget alloc_inst */
static struct usb_function_instance *f_midi2_alloc_inst(void)
{
struct f_midi2_opts *opts;
struct f_midi2_ep_opts *ep_opts;
struct f_midi2_block_opts *block_opts;
int ret;
opts = kzalloc(sizeof(*opts), GFP_KERNEL);
if (!opts)
return ERR_PTR(-ENOMEM);
mutex_init(&opts->lock);
opts->func_inst.free_func_inst = f_midi2_free_inst;
opts->info.process_ump = true;
opts->info.static_block = true;
opts->info.num_reqs = 32;
opts->info.req_buf_size = 512;
/* create the default ep */
ret = f_midi2_ep_opts_create(opts, 0, &ep_opts);
if (ret) {
kfree(opts);
return ERR_PTR(ret);
}
/* create the default block */
ret = f_midi2_block_opts_create(ep_opts, 0, &block_opts);
if (ret) {
kfree(ep_opts);
kfree(opts);
return ERR_PTR(ret);
}
/* set up the default MIDI1 (that is mandatory) */
block_opts->info.midi1_num_groups = 1;
config_group_init_type_name(&opts->func_inst.group, "",
&f_midi2_func_type);
config_group_init_type_name(&ep_opts->group, "ep.0",
&f_midi2_ep_type);
configfs_add_default_group(&ep_opts->group, &opts->func_inst.group);
config_group_init_type_name(&block_opts->group, "block.0",
&f_midi2_block_type);
configfs_add_default_group(&block_opts->group, &ep_opts->group);
return &opts->func_inst;
}
static void do_f_midi2_free(struct f_midi2 *midi2, struct f_midi2_opts *opts)
{
mutex_lock(&opts->lock);
--opts->refcnt;
mutex_unlock(&opts->lock);
kfree(midi2->string_defs);
kfree(midi2);
}
static void f_midi2_free(struct usb_function *f)
{
do_f_midi2_free(func_to_midi2(f),
container_of(f->fi, struct f_midi2_opts, func_inst));
}
/* verify the parameters set up via configfs;
* return the number of EPs or a negative error
*/
static int verify_parameters(struct f_midi2_opts *opts)
{
int i, j, num_eps, num_blks;
struct f_midi2_ep_info *ep;
struct f_midi2_block_info *bp;
for (num_eps = 0; num_eps < MAX_UMP_EPS && opts->eps[num_eps];
num_eps++)
;
if (!num_eps) {
pr_err("f_midi2: No EP is defined\n");
return -EINVAL;
}
num_blks = 0;
for (i = 0; i < num_eps; i++) {
ep = &opts->eps[i]->info;
if (!(ep->protocol_caps & ep->protocol)) {
pr_err("f_midi2: Invalid protocol 0x%x (caps 0x%x) for EP %d\n",
ep->protocol, ep->protocol_caps, i);
return -EINVAL;
}
for (j = 0; j < SNDRV_UMP_MAX_BLOCKS && opts->eps[i]->blks[j];
j++, num_blks++) {
bp = &opts->eps[i]->blks[j]->info;
if (bp->first_group + bp->num_groups > SNDRV_UMP_MAX_GROUPS) {
pr_err("f_midi2: Invalid group definitions for block %d:%d\n",
i, j);
return -EINVAL;
}
if (bp->midi1_num_groups) {
if (bp->midi1_first_group < bp->first_group ||
bp->midi1_first_group + bp->midi1_num_groups >
bp->first_group + bp->num_groups) {
pr_err("f_midi2: Invalid MIDI1 group definitions for block %d:%d\n",
i, j);
return -EINVAL;
}
}
}
}
if (!num_blks) {
pr_err("f_midi2: No block is defined\n");
return -EINVAL;
}
return num_eps;
}
/* fill mapping between MIDI 1.0 cable and UMP EP/group */
static void fill_midi1_cable_mapping(struct f_midi2 *midi2,
struct f_midi2_ep *ep,
int blk)
{
const struct f_midi2_block_info *binfo = &ep->blks[blk].info;
struct midi1_cable_mapping *map;
int i, group;
if (!binfo->midi1_num_groups)
return;
if (binfo->direction != SNDRV_UMP_DIR_OUTPUT) {
group = binfo->midi1_first_group;
map = midi2->in_cable_mapping + midi2->num_midi1_in;
for (i = 0; i < binfo->midi1_num_groups; i++, group++, map++) {
if (midi2->num_midi1_in >= MAX_CABLES)
break;
map->ep = ep;
map->block = blk;
map->group = group;
midi2->num_midi1_in++;
/* store 1-based cable number */
ep->in_group_to_cable[group] = midi2->num_midi1_in;
}
}
if (binfo->direction != SNDRV_UMP_DIR_INPUT) {
group = binfo->midi1_first_group;
map = midi2->out_cable_mapping + midi2->num_midi1_out;
for (i = 0; i < binfo->midi1_num_groups; i++, group++, map++) {
if (midi2->num_midi1_out >= MAX_CABLES)
break;
map->ep = ep;
map->block = blk;
map->group = group;
midi2->num_midi1_out++;
}
}
}
/* gadget alloc callback */
static struct usb_function *f_midi2_alloc(struct usb_function_instance *fi)
{
struct f_midi2 *midi2;
struct f_midi2_opts *opts;
struct f_midi2_ep *ep;
struct f_midi2_block *bp;
int i, num_eps, blk;
midi2 = kzalloc(sizeof(*midi2), GFP_KERNEL);
if (!midi2)
return ERR_PTR(-ENOMEM);
opts = container_of(fi, struct f_midi2_opts, func_inst);
mutex_lock(&opts->lock);
num_eps = verify_parameters(opts);
if (num_eps < 0) {
mutex_unlock(&opts->lock);
kfree(midi2);
return ERR_PTR(num_eps);
}
++opts->refcnt;
mutex_unlock(&opts->lock);
spin_lock_init(&midi2->queue_lock);
midi2->func.name = "midi2_func";
midi2->func.bind = f_midi2_bind;
midi2->func.unbind = f_midi2_unbind;
midi2->func.get_alt = f_midi2_get_alt;
midi2->func.set_alt = f_midi2_set_alt;
midi2->func.setup = f_midi2_setup;
midi2->func.disable = f_midi2_disable;
midi2->func.free_func = f_midi2_free;
midi2->info = opts->info;
midi2->num_eps = num_eps;
for (i = 0; i < num_eps; i++) {
ep = &midi2->midi2_eps[i];
ep->info = opts->eps[i]->info;
ep->card = midi2;
for (blk = 0; blk < SNDRV_UMP_MAX_BLOCKS &&
opts->eps[i]->blks[blk]; blk++) {
bp = &ep->blks[blk];
ep->num_blks++;
bp->info = opts->eps[i]->blks[blk]->info;
bp->gtb_id = ++midi2->total_blocks;
}
}
midi2->string_defs = kcalloc(midi2->total_blocks + 1,
sizeof(*midi2->string_defs), GFP_KERNEL);
if (!midi2->string_defs) {
do_f_midi2_free(midi2, opts);
return ERR_PTR(-ENOMEM);
}
if (opts->info.iface_name && *opts->info.iface_name)
midi2->string_defs[STR_IFACE].s = opts->info.iface_name;
else
midi2->string_defs[STR_IFACE].s = ump_ep_name(&midi2->midi2_eps[0]);
for (i = 0; i < midi2->num_eps; i++) {
ep = &midi2->midi2_eps[i];
for (blk = 0; blk < ep->num_blks; blk++) {
bp = &ep->blks[blk];
midi2->string_defs[gtb_to_str_id(bp->gtb_id)].s =
ump_fb_name(&bp->info);
fill_midi1_cable_mapping(midi2, ep, blk);
}
}
if (!midi2->num_midi1_in && !midi2->num_midi1_out) {
pr_err("f_midi2: MIDI1 definition is missing\n");
do_f_midi2_free(midi2, opts);
return ERR_PTR(-EINVAL);
}
return &midi2->func;
}
DECLARE_USB_FUNCTION_INIT(midi2, f_midi2_alloc_inst, f_midi2_alloc);
MODULE_DESCRIPTION("USB MIDI 2.0 class function driver");
MODULE_LICENSE("GPL");
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