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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* Line 6 Linux USB driver
*
* Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
*/
#ifndef DRIVER_H
#define DRIVER_H
#include <linux/usb.h>
#include <linux/mutex.h>
#include <linux/kfifo.h>
#include <sound/core.h>
#include "midi.h"
/* USB 1.1 speed configuration */
#define USB_LOW_INTERVALS_PER_SECOND 1000
#define USB_LOW_ISO_BUFFERS 2
/* USB 2.0+ speed configuration */
#define USB_HIGH_INTERVALS_PER_SECOND 8000
#define USB_HIGH_ISO_BUFFERS 16
/* Fallback USB interval and max packet size values */
#define LINE6_FALLBACK_INTERVAL 10
#define LINE6_FALLBACK_MAXPACKETSIZE 16
#define LINE6_TIMEOUT 1000
#define LINE6_BUFSIZE_LISTEN 64
#define LINE6_MIDI_MESSAGE_MAXLEN 256
#define LINE6_RAW_MESSAGES_MAXCOUNT_ORDER 7
/* 4k packets are common, BUFSIZE * MAXCOUNT should be bigger... */
#define LINE6_RAW_MESSAGES_MAXCOUNT (1 << LINE6_RAW_MESSAGES_MAXCOUNT_ORDER)
#if LINE6_BUFSIZE_LISTEN > 65535
#error "Use dynamic fifo instead"
#endif
/*
Line 6 MIDI control commands
*/
#define LINE6_PARAM_CHANGE 0xb0
#define LINE6_PROGRAM_CHANGE 0xc0
#define LINE6_SYSEX_BEGIN 0xf0
#define LINE6_SYSEX_END 0xf7
#define LINE6_RESET 0xff
/*
MIDI channel for messages initiated by the host
(and eventually echoed back by the device)
*/
#define LINE6_CHANNEL_HOST 0x00
/*
MIDI channel for messages initiated by the device
*/
#define LINE6_CHANNEL_DEVICE 0x02
#define LINE6_CHANNEL_UNKNOWN 5 /* don't know yet what this is good for */
#define LINE6_CHANNEL_MASK 0x0f
extern const unsigned char line6_midi_id[3];
#define SYSEX_DATA_OFS (sizeof(line6_midi_id) + 3)
#define SYSEX_EXTRA_SIZE (sizeof(line6_midi_id) + 4)
/*
Common properties of Line 6 devices.
*/
struct line6_properties {
/* Card id string (maximum 16 characters).
* This can be used to address the device in ALSA programs as
* "default:CARD=<id>"
*/
const char *id;
/* Card short name (maximum 32 characters) */
const char *name;
/* Bit vector defining this device's capabilities in line6usb driver */
int capabilities;
int altsetting;
unsigned int ctrl_if;
unsigned int ep_ctrl_r;
unsigned int ep_ctrl_w;
unsigned int ep_audio_r;
unsigned int ep_audio_w;
};
/* Capability bits */
enum {
/* device supports settings parameter via USB */
LINE6_CAP_CONTROL = 1 << 0,
/* device supports PCM input/output via USB */
LINE6_CAP_PCM = 1 << 1,
/* device supports hardware monitoring */
LINE6_CAP_HWMON = 1 << 2,
/* device requires output data when input is read */
LINE6_CAP_IN_NEEDS_OUT = 1 << 3,
/* device uses raw MIDI via USB (data endpoints) */
LINE6_CAP_CONTROL_MIDI = 1 << 4,
/* device provides low-level information */
LINE6_CAP_CONTROL_INFO = 1 << 5,
/* device provides hardware monitoring volume control */
LINE6_CAP_HWMON_CTL = 1 << 6,
};
/*
Common data shared by all Line 6 devices.
Corresponds to a pair of USB endpoints.
*/
struct usb_line6 {
/* USB device */
struct usb_device *usbdev;
/* Properties */
const struct line6_properties *properties;
/* Interval for data USB packets */
int interval;
/* ...for isochronous transfers framing */
int intervals_per_second;
/* Number of isochronous URBs used for frame transfers */
int iso_buffers;
/* Maximum size of data USB packet */
int max_packet_size;
/* Device representing the USB interface */
struct device *ifcdev;
/* Line 6 sound card data structure.
* Each device has at least MIDI or PCM.
*/
struct snd_card *card;
/* Line 6 PCM device data structure */
struct snd_line6_pcm *line6pcm;
/* Line 6 MIDI device data structure */
struct snd_line6_midi *line6midi;
/* URB for listening to POD data endpoint */
struct urb *urb_listen;
/* Buffer for incoming data from POD data endpoint */
unsigned char *buffer_listen;
/* Buffer for message to be processed, generated from MIDI layer */
unsigned char *buffer_message;
/* Length of message to be processed, generated from MIDI layer */
int message_length;
/* Circular buffer for non-MIDI control messages */
struct {
struct mutex read_lock;
wait_queue_head_t wait_queue;
unsigned int active:1;
unsigned int nonblock:1;
STRUCT_KFIFO_REC_2(LINE6_BUFSIZE_LISTEN * LINE6_RAW_MESSAGES_MAXCOUNT)
fifo;
} messages;
/* Work for delayed PCM startup */
struct delayed_work startup_work;
/* If MIDI is supported, buffer_message contains the pre-processed data;
* otherwise the data is only in urb_listen (buffer_incoming).
*/
void (*process_message)(struct usb_line6 *);
void (*disconnect)(struct usb_line6 *line6);
void (*startup)(struct usb_line6 *line6);
};
extern char *line6_alloc_sysex_buffer(struct usb_line6 *line6, int code1,
int code2, int size);
extern int line6_read_data(struct usb_line6 *line6, unsigned address,
void *data, unsigned datalen);
extern int line6_read_serial_number(struct usb_line6 *line6,
u32 *serial_number);
extern int line6_send_raw_message(struct usb_line6 *line6,
const char *buffer, int size);
extern int line6_send_raw_message_async(struct usb_line6 *line6,
const char *buffer, int size);
extern int line6_send_sysex_message(struct usb_line6 *line6,
const char *buffer, int size);
extern ssize_t line6_set_raw(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count);
extern int line6_version_request_async(struct usb_line6 *line6);
extern int line6_write_data(struct usb_line6 *line6, unsigned address,
void *data, unsigned datalen);
int line6_probe(struct usb_interface *interface,
const struct usb_device_id *id,
const char *driver_name,
const struct line6_properties *properties,
int (*private_init)(struct usb_line6 *, const struct usb_device_id *id),
size_t data_size);
void line6_disconnect(struct usb_interface *interface);
#ifdef CONFIG_PM
int line6_suspend(struct usb_interface *interface, pm_message_t message);
int line6_resume(struct usb_interface *interface);
#endif
#endif
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