1353 строки
33 KiB
C
1353 строки
33 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* f_midi.c -- USB MIDI class function driver
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*
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* Copyright (C) 2006 Thumtronics Pty Ltd.
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* Developed for Thumtronics by Grey Innovation
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* Ben Williamson <ben.williamson@greyinnovation.com>
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*
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* Rewritten for the composite framework
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* Copyright (C) 2011 Daniel Mack <zonque@gmail.com>
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*
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* Based on drivers/usb/gadget/f_audio.c,
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* Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
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* Copyright (C) 2008 Analog Devices, Inc
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*
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* and drivers/usb/gadget/midi.c,
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* Copyright (C) 2006 Thumtronics Pty Ltd.
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* Ben Williamson <ben.williamson@greyinnovation.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/device.h>
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#include <linux/kfifo.h>
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#include <linux/spinlock.h>
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#include <sound/core.h>
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#include <sound/initval.h>
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#include <sound/rawmidi.h>
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#include <linux/usb/ch9.h>
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#include <linux/usb/gadget.h>
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#include <linux/usb/audio.h>
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#include <linux/usb/midi.h>
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#include "u_f.h"
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#include "u_midi.h"
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MODULE_AUTHOR("Ben Williamson");
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MODULE_LICENSE("GPL v2");
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static const char f_midi_shortname[] = "f_midi";
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static const char f_midi_longname[] = "MIDI Gadget";
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/*
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* We can only handle 16 cables on one single endpoint, as cable numbers are
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* stored in 4-bit fields. And as the interface currently only holds one
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* single endpoint, this is the maximum number of ports we can allow.
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*/
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#define MAX_PORTS 16
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/* MIDI message states */
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enum {
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STATE_INITIAL = 0, /* pseudo state */
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STATE_1PARAM,
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STATE_2PARAM_1,
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STATE_2PARAM_2,
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STATE_SYSEX_0,
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STATE_SYSEX_1,
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STATE_SYSEX_2,
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STATE_REAL_TIME,
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STATE_FINISHED, /* pseudo state */
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};
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/*
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* This is a gadget, and the IN/OUT naming is from the host's perspective.
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* USB -> OUT endpoint -> rawmidi
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* USB <- IN endpoint <- rawmidi
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*/
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struct gmidi_in_port {
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struct snd_rawmidi_substream *substream;
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int active;
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uint8_t cable;
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uint8_t state;
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uint8_t data[2];
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};
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struct f_midi {
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struct usb_function func;
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struct usb_gadget *gadget;
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struct usb_ep *in_ep, *out_ep;
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struct snd_card *card;
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struct snd_rawmidi *rmidi;
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u8 ms_id;
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struct snd_rawmidi_substream *out_substream[MAX_PORTS];
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unsigned long out_triggered;
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struct tasklet_struct tasklet;
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unsigned int in_ports;
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unsigned int out_ports;
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int index;
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char *id;
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unsigned int buflen, qlen;
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/* This fifo is used as a buffer ring for pre-allocated IN usb_requests */
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DECLARE_KFIFO_PTR(in_req_fifo, struct usb_request *);
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spinlock_t transmit_lock;
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unsigned int in_last_port;
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unsigned char free_ref;
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struct gmidi_in_port in_ports_array[/* in_ports */];
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};
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static inline struct f_midi *func_to_midi(struct usb_function *f)
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{
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return container_of(f, struct f_midi, func);
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}
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static void f_midi_transmit(struct f_midi *midi);
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static void f_midi_rmidi_free(struct snd_rawmidi *rmidi);
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static void f_midi_free_inst(struct usb_function_instance *f);
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DECLARE_UAC_AC_HEADER_DESCRIPTOR(1);
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DECLARE_USB_MIDI_OUT_JACK_DESCRIPTOR(1);
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DECLARE_USB_MS_ENDPOINT_DESCRIPTOR(16);
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/* B.3.1 Standard AC Interface Descriptor */
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static struct usb_interface_descriptor ac_interface_desc = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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/* .bInterfaceNumber = DYNAMIC */
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/* .bNumEndpoints = DYNAMIC */
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.bInterfaceClass = USB_CLASS_AUDIO,
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.bInterfaceSubClass = USB_SUBCLASS_AUDIOCONTROL,
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/* .iInterface = DYNAMIC */
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};
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/* B.3.2 Class-Specific AC Interface Descriptor */
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static struct uac1_ac_header_descriptor_1 ac_header_desc = {
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.bLength = UAC_DT_AC_HEADER_SIZE(1),
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubtype = USB_MS_HEADER,
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.bcdADC = cpu_to_le16(0x0100),
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.wTotalLength = cpu_to_le16(UAC_DT_AC_HEADER_SIZE(1)),
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.bInCollection = 1,
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/* .baInterfaceNr = DYNAMIC */
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};
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/* B.4.1 Standard MS Interface Descriptor */
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static struct usb_interface_descriptor ms_interface_desc = {
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.bLength = USB_DT_INTERFACE_SIZE,
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.bDescriptorType = USB_DT_INTERFACE,
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/* .bInterfaceNumber = DYNAMIC */
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.bNumEndpoints = 2,
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.bInterfaceClass = USB_CLASS_AUDIO,
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.bInterfaceSubClass = USB_SUBCLASS_MIDISTREAMING,
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/* .iInterface = DYNAMIC */
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};
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/* B.4.2 Class-Specific MS Interface Descriptor */
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static struct usb_ms_header_descriptor ms_header_desc = {
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.bLength = USB_DT_MS_HEADER_SIZE,
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.bDescriptorType = USB_DT_CS_INTERFACE,
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.bDescriptorSubtype = USB_MS_HEADER,
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.bcdMSC = cpu_to_le16(0x0100),
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/* .wTotalLength = DYNAMIC */
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};
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/* B.5.1 Standard Bulk OUT Endpoint Descriptor */
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static struct usb_endpoint_descriptor bulk_out_desc = {
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.bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_OUT,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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};
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static struct usb_ss_ep_comp_descriptor bulk_out_ss_comp_desc = {
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.bLength = sizeof(bulk_out_ss_comp_desc),
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.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
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/* .bMaxBurst = 0, */
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/* .bmAttributes = 0, */
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};
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/* B.5.2 Class-specific MS Bulk OUT Endpoint Descriptor */
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static struct usb_ms_endpoint_descriptor_16 ms_out_desc = {
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/* .bLength = DYNAMIC */
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.bDescriptorType = USB_DT_CS_ENDPOINT,
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.bDescriptorSubtype = USB_MS_GENERAL,
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/* .bNumEmbMIDIJack = DYNAMIC */
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/* .baAssocJackID = DYNAMIC */
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};
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/* B.6.1 Standard Bulk IN Endpoint Descriptor */
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static struct usb_endpoint_descriptor bulk_in_desc = {
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.bLength = USB_DT_ENDPOINT_AUDIO_SIZE,
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.bDescriptorType = USB_DT_ENDPOINT,
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.bEndpointAddress = USB_DIR_IN,
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.bmAttributes = USB_ENDPOINT_XFER_BULK,
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};
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static struct usb_ss_ep_comp_descriptor bulk_in_ss_comp_desc = {
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.bLength = sizeof(bulk_in_ss_comp_desc),
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.bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
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/* .bMaxBurst = 0, */
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/* .bmAttributes = 0, */
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};
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/* B.6.2 Class-specific MS Bulk IN Endpoint Descriptor */
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static struct usb_ms_endpoint_descriptor_16 ms_in_desc = {
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/* .bLength = DYNAMIC */
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.bDescriptorType = USB_DT_CS_ENDPOINT,
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.bDescriptorSubtype = USB_MS_GENERAL,
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/* .bNumEmbMIDIJack = DYNAMIC */
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/* .baAssocJackID = DYNAMIC */
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};
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/* string IDs are assigned dynamically */
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#define STRING_FUNC_IDX 0
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static struct usb_string midi_string_defs[] = {
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[STRING_FUNC_IDX].s = "MIDI function",
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{ } /* end of list */
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};
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static struct usb_gadget_strings midi_stringtab = {
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.language = 0x0409, /* en-us */
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.strings = midi_string_defs,
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};
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static struct usb_gadget_strings *midi_strings[] = {
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&midi_stringtab,
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NULL,
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};
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static inline struct usb_request *midi_alloc_ep_req(struct usb_ep *ep,
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unsigned length)
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{
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return alloc_ep_req(ep, length);
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}
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static const uint8_t f_midi_cin_length[] = {
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0, 0, 2, 3, 3, 1, 2, 3, 3, 3, 3, 3, 2, 2, 3, 1
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};
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/*
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* Receives a chunk of MIDI data.
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*/
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static void f_midi_read_data(struct usb_ep *ep, int cable,
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uint8_t *data, int length)
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{
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struct f_midi *midi = ep->driver_data;
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struct snd_rawmidi_substream *substream = midi->out_substream[cable];
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if (!substream)
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/* Nobody is listening - throw it on the floor. */
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return;
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if (!test_bit(cable, &midi->out_triggered))
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return;
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snd_rawmidi_receive(substream, data, length);
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}
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static void f_midi_handle_out_data(struct usb_ep *ep, struct usb_request *req)
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{
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unsigned int i;
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u8 *buf = req->buf;
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for (i = 0; i + 3 < req->actual; i += 4)
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if (buf[i] != 0) {
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int cable = buf[i] >> 4;
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int length = f_midi_cin_length[buf[i] & 0x0f];
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f_midi_read_data(ep, cable, &buf[i + 1], length);
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}
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}
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static void
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f_midi_complete(struct usb_ep *ep, struct usb_request *req)
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{
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struct f_midi *midi = ep->driver_data;
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struct usb_composite_dev *cdev = midi->func.config->cdev;
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int status = req->status;
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switch (status) {
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case 0: /* normal completion */
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if (ep == midi->out_ep) {
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/* We received stuff. req is queued again, below */
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f_midi_handle_out_data(ep, req);
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} else if (ep == midi->in_ep) {
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/* Our transmit completed. See if there's more to go.
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* f_midi_transmit eats req, don't queue it again. */
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req->length = 0;
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f_midi_transmit(midi);
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return;
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}
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break;
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/* this endpoint is normally active while we're configured */
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case -ECONNABORTED: /* hardware forced ep reset */
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case -ECONNRESET: /* request dequeued */
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case -ESHUTDOWN: /* disconnect from host */
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VDBG(cdev, "%s gone (%d), %d/%d\n", ep->name, status,
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req->actual, req->length);
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if (ep == midi->out_ep) {
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f_midi_handle_out_data(ep, req);
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/* We don't need to free IN requests because it's handled
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* by the midi->in_req_fifo. */
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free_ep_req(ep, req);
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}
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return;
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case -EOVERFLOW: /* buffer overrun on read means that
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* we didn't provide a big enough buffer.
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*/
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default:
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DBG(cdev, "%s complete --> %d, %d/%d\n", ep->name,
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status, req->actual, req->length);
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break;
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case -EREMOTEIO: /* short read */
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break;
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}
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status = usb_ep_queue(ep, req, GFP_ATOMIC);
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if (status) {
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ERROR(cdev, "kill %s: resubmit %d bytes --> %d\n",
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ep->name, req->length, status);
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usb_ep_set_halt(ep);
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/* FIXME recover later ... somehow */
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}
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}
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static void f_midi_drop_out_substreams(struct f_midi *midi)
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{
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unsigned int i;
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for (i = 0; i < midi->in_ports; i++) {
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struct gmidi_in_port *port = midi->in_ports_array + i;
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struct snd_rawmidi_substream *substream = port->substream;
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if (port->active && substream)
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snd_rawmidi_drop_output(substream);
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}
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}
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static int f_midi_start_ep(struct f_midi *midi,
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struct usb_function *f,
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struct usb_ep *ep)
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{
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int err;
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struct usb_composite_dev *cdev = f->config->cdev;
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usb_ep_disable(ep);
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err = config_ep_by_speed(midi->gadget, f, ep);
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if (err) {
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ERROR(cdev, "can't configure %s: %d\n", ep->name, err);
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return err;
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}
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err = usb_ep_enable(ep);
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if (err) {
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ERROR(cdev, "can't start %s: %d\n", ep->name, err);
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return err;
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}
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ep->driver_data = midi;
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return 0;
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}
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static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
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{
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struct f_midi *midi = func_to_midi(f);
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unsigned i;
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int err;
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/* we only set alt for MIDIStreaming interface */
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if (intf != midi->ms_id)
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return 0;
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err = f_midi_start_ep(midi, f, midi->in_ep);
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if (err)
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return err;
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err = f_midi_start_ep(midi, f, midi->out_ep);
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if (err)
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return err;
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/* pre-allocate write usb requests to use on f_midi_transmit. */
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while (kfifo_avail(&midi->in_req_fifo)) {
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struct usb_request *req =
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midi_alloc_ep_req(midi->in_ep, midi->buflen);
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if (req == NULL)
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return -ENOMEM;
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req->length = 0;
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req->complete = f_midi_complete;
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kfifo_put(&midi->in_req_fifo, req);
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}
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/* allocate a bunch of read buffers and queue them all at once. */
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for (i = 0; i < midi->qlen && err == 0; i++) {
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struct usb_request *req =
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midi_alloc_ep_req(midi->out_ep, midi->buflen);
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if (req == NULL)
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return -ENOMEM;
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req->complete = f_midi_complete;
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err = usb_ep_queue(midi->out_ep, req, GFP_ATOMIC);
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if (err) {
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ERROR(midi, "%s: couldn't enqueue request: %d\n",
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midi->out_ep->name, err);
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if (req->buf != NULL)
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free_ep_req(midi->out_ep, req);
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return err;
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}
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}
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return 0;
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}
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static void f_midi_disable(struct usb_function *f)
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{
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struct f_midi *midi = func_to_midi(f);
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struct usb_composite_dev *cdev = f->config->cdev;
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struct usb_request *req = NULL;
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DBG(cdev, "disable\n");
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/*
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* just disable endpoints, forcing completion of pending i/o.
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* all our completion handlers free their requests in this case.
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*/
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usb_ep_disable(midi->in_ep);
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usb_ep_disable(midi->out_ep);
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/* release IN requests */
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while (kfifo_get(&midi->in_req_fifo, &req))
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free_ep_req(midi->in_ep, req);
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f_midi_drop_out_substreams(midi);
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}
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static int f_midi_snd_free(struct snd_device *device)
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{
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return 0;
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}
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/*
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* Converts MIDI commands to USB MIDI packets.
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*/
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static void f_midi_transmit_byte(struct usb_request *req,
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struct gmidi_in_port *port, uint8_t b)
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{
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uint8_t p[4] = { port->cable << 4, 0, 0, 0 };
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uint8_t next_state = STATE_INITIAL;
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switch (b) {
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case 0xf8 ... 0xff:
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/* System Real-Time Messages */
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p[0] |= 0x0f;
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p[1] = b;
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next_state = port->state;
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port->state = STATE_REAL_TIME;
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break;
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case 0xf7:
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/* End of SysEx */
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switch (port->state) {
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case STATE_SYSEX_0:
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p[0] |= 0x05;
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p[1] = 0xf7;
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next_state = STATE_FINISHED;
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break;
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case STATE_SYSEX_1:
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p[0] |= 0x06;
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p[1] = port->data[0];
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p[2] = 0xf7;
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next_state = STATE_FINISHED;
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break;
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case STATE_SYSEX_2:
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p[0] |= 0x07;
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p[1] = port->data[0];
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p[2] = port->data[1];
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p[3] = 0xf7;
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next_state = STATE_FINISHED;
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break;
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default:
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/* Ignore byte */
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next_state = port->state;
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port->state = STATE_INITIAL;
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}
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break;
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case 0xf0 ... 0xf6:
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/* System Common Messages */
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port->data[0] = port->data[1] = 0;
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port->state = STATE_INITIAL;
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switch (b) {
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case 0xf0:
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port->data[0] = b;
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port->data[1] = 0;
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next_state = STATE_SYSEX_1;
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break;
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case 0xf1:
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case 0xf3:
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port->data[0] = b;
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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) {
|
|
|
|
unsigned int length = req->length;
|
|
u8 *buf = (u8 *)req->buf + length;
|
|
|
|
memcpy(buf, p, sizeof(p));
|
|
req->length = length + sizeof(p);
|
|
|
|
if (next_state == STATE_FINISHED) {
|
|
next_state = STATE_INITIAL;
|
|
port->data[0] = port->data[1] = 0;
|
|
}
|
|
}
|
|
|
|
port->state = next_state;
|
|
}
|
|
|
|
static int f_midi_do_transmit(struct f_midi *midi, struct usb_ep *ep)
|
|
{
|
|
struct usb_request *req = NULL;
|
|
unsigned int len, i;
|
|
bool active = false;
|
|
int err;
|
|
|
|
/*
|
|
* We peek the request in order to reuse it if it fails to enqueue on
|
|
* its endpoint
|
|
*/
|
|
len = kfifo_peek(&midi->in_req_fifo, &req);
|
|
if (len != 1) {
|
|
ERROR(midi, "%s: Couldn't get usb request\n", __func__);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* If buffer overrun, then we ignore this transmission.
|
|
* IMPORTANT: This will cause the user-space rawmidi device to block
|
|
* until a) usb requests have been completed or b) snd_rawmidi_write()
|
|
* times out.
|
|
*/
|
|
if (req->length > 0)
|
|
return 0;
|
|
|
|
for (i = midi->in_last_port; i < midi->in_ports; ++i) {
|
|
struct gmidi_in_port *port = midi->in_ports_array + i;
|
|
struct snd_rawmidi_substream *substream = port->substream;
|
|
|
|
if (!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);
|
|
}
|
|
|
|
active = !!port->active;
|
|
if (active)
|
|
break;
|
|
}
|
|
midi->in_last_port = active ? i : 0;
|
|
|
|
if (req->length <= 0)
|
|
goto done;
|
|
|
|
err = usb_ep_queue(ep, req, GFP_ATOMIC);
|
|
if (err < 0) {
|
|
ERROR(midi, "%s failed to queue req: %d\n",
|
|
midi->in_ep->name, err);
|
|
req->length = 0; /* Re-use request next time. */
|
|
} else {
|
|
/* Upon success, put request at the back of the queue. */
|
|
kfifo_skip(&midi->in_req_fifo);
|
|
kfifo_put(&midi->in_req_fifo, req);
|
|
}
|
|
|
|
done:
|
|
return active;
|
|
}
|
|
|
|
static void f_midi_transmit(struct f_midi *midi)
|
|
{
|
|
struct usb_ep *ep = midi->in_ep;
|
|
int ret;
|
|
unsigned long flags;
|
|
|
|
/* We only care about USB requests if IN endpoint is enabled */
|
|
if (!ep || !ep->enabled)
|
|
goto drop_out;
|
|
|
|
spin_lock_irqsave(&midi->transmit_lock, flags);
|
|
|
|
do {
|
|
ret = f_midi_do_transmit(midi, ep);
|
|
if (ret < 0) {
|
|
spin_unlock_irqrestore(&midi->transmit_lock, flags);
|
|
goto drop_out;
|
|
}
|
|
} while (ret);
|
|
|
|
spin_unlock_irqrestore(&midi->transmit_lock, flags);
|
|
|
|
return;
|
|
|
|
drop_out:
|
|
f_midi_drop_out_substreams(midi);
|
|
}
|
|
|
|
static void f_midi_in_tasklet(unsigned long data)
|
|
{
|
|
struct f_midi *midi = (struct f_midi *) data;
|
|
f_midi_transmit(midi);
|
|
}
|
|
|
|
static int f_midi_in_open(struct snd_rawmidi_substream *substream)
|
|
{
|
|
struct f_midi *midi = substream->rmidi->private_data;
|
|
struct gmidi_in_port *port;
|
|
|
|
if (substream->number >= midi->in_ports)
|
|
return -EINVAL;
|
|
|
|
VDBG(midi, "%s()\n", __func__);
|
|
port = midi->in_ports_array + substream->number;
|
|
port->substream = substream;
|
|
port->state = STATE_INITIAL;
|
|
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 (substream->number >= midi->in_ports)
|
|
return;
|
|
|
|
VDBG(midi, "%s() %d\n", __func__, up);
|
|
midi->in_ports_array[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 const struct snd_rawmidi_ops gmidi_in_ops = {
|
|
.open = f_midi_in_open,
|
|
.close = f_midi_in_close,
|
|
.trigger = f_midi_in_trigger,
|
|
};
|
|
|
|
static const 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;
|
|
midi->in_last_port = 0;
|
|
strcpy(rmidi->name, card->shortname);
|
|
rmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT |
|
|
SNDRV_RAWMIDI_INFO_INPUT |
|
|
SNDRV_RAWMIDI_INFO_DUPLEX;
|
|
rmidi->private_data = midi;
|
|
rmidi->private_free = f_midi_rmidi_free;
|
|
midi->free_ref++;
|
|
|
|
/*
|
|
* 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, endpoint_descriptor_index = 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;
|
|
midi->ms_id = 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) + 11, 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 */
|
|
endpoint_descriptor_index = i;
|
|
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;
|
|
}
|
|
|
|
if (gadget_is_superspeed(c->cdev->gadget)) {
|
|
bulk_in_desc.wMaxPacketSize = cpu_to_le16(1024);
|
|
bulk_out_desc.wMaxPacketSize = cpu_to_le16(1024);
|
|
i = endpoint_descriptor_index;
|
|
midi_function[i++] = (struct usb_descriptor_header *)
|
|
&bulk_out_desc;
|
|
midi_function[i++] = (struct usb_descriptor_header *)
|
|
&bulk_out_ss_comp_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 *)
|
|
&bulk_in_ss_comp_desc;
|
|
midi_function[i++] = (struct usb_descriptor_header *)
|
|
&ms_in_desc;
|
|
f->ss_descriptors = usb_copy_descriptors(midi_function);
|
|
if (!f->ss_descriptors)
|
|
goto fail_f_midi;
|
|
}
|
|
|
|
kfree(midi_function);
|
|
|
|
return 0;
|
|
|
|
fail_f_midi:
|
|
kfree(midi_function);
|
|
usb_free_all_descriptors(f);
|
|
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 > 1) { \
|
|
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 > 1) {
|
|
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 const 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;
|
|
bool free = false;
|
|
|
|
opts = container_of(f, struct f_midi_opts, func_inst);
|
|
|
|
mutex_lock(&opts->lock);
|
|
if (!--opts->refcnt) {
|
|
free = true;
|
|
}
|
|
mutex_unlock(&opts->lock);
|
|
|
|
if (free) {
|
|
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 = 512;
|
|
opts->qlen = 32;
|
|
opts->in_ports = 1;
|
|
opts->out_ports = 1;
|
|
opts->refcnt = 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;
|
|
bool free = false;
|
|
|
|
midi = func_to_midi(f);
|
|
opts = container_of(f->fi, struct f_midi_opts, func_inst);
|
|
mutex_lock(&opts->lock);
|
|
if (!--midi->free_ref) {
|
|
kfree(midi->id);
|
|
kfifo_free(&midi->in_req_fifo);
|
|
kfree(midi);
|
|
free = true;
|
|
}
|
|
mutex_unlock(&opts->lock);
|
|
|
|
if (free)
|
|
f_midi_free_inst(&opts->func_inst);
|
|
}
|
|
|
|
static void f_midi_rmidi_free(struct snd_rawmidi *rmidi)
|
|
{
|
|
f_midi_free(rmidi->private_data);
|
|
}
|
|
|
|
static void f_midi_unbind(struct usb_configuration *c, struct usb_function *f)
|
|
{
|
|
struct usb_composite_dev *cdev = f->config->cdev;
|
|
struct f_midi *midi = func_to_midi(f);
|
|
struct snd_card *card;
|
|
|
|
DBG(cdev, "unbind\n");
|
|
|
|
/* just to be sure */
|
|
f_midi_disable(f);
|
|
|
|
card = midi->card;
|
|
midi->card = NULL;
|
|
if (card)
|
|
snd_card_free_when_closed(card);
|
|
|
|
usb_free_all_descriptors(f);
|
|
}
|
|
|
|
static struct usb_function *f_midi_alloc(struct usb_function_instance *fi)
|
|
{
|
|
struct f_midi *midi = NULL;
|
|
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) {
|
|
status = -EINVAL;
|
|
goto setup_fail;
|
|
}
|
|
|
|
/* allocate and initialize one new instance */
|
|
midi = kzalloc(struct_size(midi, in_ports_array, opts->in_ports),
|
|
GFP_KERNEL);
|
|
if (!midi) {
|
|
status = -ENOMEM;
|
|
goto setup_fail;
|
|
}
|
|
|
|
for (i = 0; i < opts->in_ports; i++)
|
|
midi->in_ports_array[i].cable = i;
|
|
|
|
/* set up ALSA midi devices */
|
|
midi->id = kstrdup(opts->id, GFP_KERNEL);
|
|
if (opts->id && !midi->id) {
|
|
status = -ENOMEM;
|
|
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;
|
|
midi->in_last_port = 0;
|
|
midi->free_ref = 1;
|
|
|
|
status = kfifo_alloc(&midi->in_req_fifo, midi->qlen, GFP_KERNEL);
|
|
if (status)
|
|
goto setup_fail;
|
|
|
|
spin_lock_init(&midi->transmit_lock);
|
|
|
|
++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:
|
|
mutex_unlock(&opts->lock);
|
|
kfree(midi);
|
|
return ERR_PTR(status);
|
|
}
|
|
|
|
DECLARE_USB_FUNCTION_INIT(midi, f_midi_alloc_inst, f_midi_alloc);
|