sound/usb/line6/driver.h

   1 /*
   2  * Line 6 Linux USB driver
   3  *
   4  * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
   5  *
   6  *      This program is free software; you can redistribute it and/or
   7  *      modify it under the terms of the GNU General Public License as
   8  *      published by the Free Software Foundation, version 2.
   9  *
  10  */
  11
  12 #ifndef DRIVER_H
  13 #define DRIVER_H
  14
  15 #include <linux/usb.h>
  16 #include <linux/mutex.h>
  17 #include <linux/kfifo.h>
  18 #include <sound/core.h>
  19
  20 #include "midi.h"
  21
  22 /* USB 1.1 speed configuration */
  23 #define USB_LOW_INTERVALS_PER_SECOND 1000
  24 #define USB_LOW_ISO_BUFFERS 2
  25
  26 /* USB 2.0+ speed configuration */
  27 #define USB_HIGH_INTERVALS_PER_SECOND 8000
  28 #define USB_HIGH_ISO_BUFFERS 16
  29
  30 /* Fallback USB interval and max packet size values */
  31 #define LINE6_FALLBACK_INTERVAL 10
  32 #define LINE6_FALLBACK_MAXPACKETSIZE 16
  33
  34 #define LINE6_TIMEOUT 1
  35 #define LINE6_BUFSIZE_LISTEN 64
  36 #define LINE6_MIDI_MESSAGE_MAXLEN 256
  37
  38 #define LINE6_RAW_MESSAGES_MAXCOUNT_ORDER 7
  39 /* 4k packets are common, BUFSIZE * MAXCOUNT should be bigger... */
  40 #define LINE6_RAW_MESSAGES_MAXCOUNT (1 << LINE6_RAW_MESSAGES_MAXCOUNT_ORDER)
  41
  42
  43 #if LINE6_BUFSIZE_LISTEN > 65535
  44 #error "Use dynamic fifo instead"
  45 #endif
  46
  47 /*
  48         Line 6 MIDI control commands
  49 */
  50 #define LINE6_PARAM_CHANGE   0xb0
  51 #define LINE6_PROGRAM_CHANGE 0xc0
  52 #define LINE6_SYSEX_BEGIN    0xf0
  53 #define LINE6_SYSEX_END      0xf7
  54 #define LINE6_RESET          0xff
  55
  56 /*
  57         MIDI channel for messages initiated by the host
  58         (and eventually echoed back by the device)
  59 */
  60 #define LINE6_CHANNEL_HOST   0x00
  61
  62 /*
  63         MIDI channel for messages initiated by the device
  64 */
  65 #define LINE6_CHANNEL_DEVICE 0x02
  66
  67 #define LINE6_CHANNEL_UNKNOWN 5 /* don't know yet what this is good for */
  68
  69 #define LINE6_CHANNEL_MASK 0x0f
  70
  71 #define CHECK_STARTUP_PROGRESS(x, n)    \
  72 do {                                    \
  73         if ((x) >= (n))                 \
  74                 return;                 \
  75         x = (n);                        \
  76 } while (0)
  77
  78 extern const unsigned char line6_midi_id[3];
  79
  80 static const int SYSEX_DATA_OFS = sizeof(line6_midi_id) + 3;
  81 static const int SYSEX_EXTRA_SIZE = sizeof(line6_midi_id) + 4;
  82
  83 /*
  84          Common properties of Line 6 devices.
  85 */
  86 struct line6_properties {
  87         /* Card id string (maximum 16 characters).
  88          * This can be used to address the device in ALSA programs as
  89          * "default:CARD=<id>"
  90          */
  91         const char *id;
  92
  93         /* Card short name (maximum 32 characters) */
  94         const char *name;
  95
  96         /* Bit vector defining this device's capabilities in line6usb driver */
  97         int capabilities;
  98
  99         int altsetting;
 100
 101         unsigned int ctrl_if;
 102         unsigned int ep_ctrl_r;
 103         unsigned int ep_ctrl_w;
 104         unsigned int ep_audio_r;
 105         unsigned int ep_audio_w;
 106 };
 107
 108 /* Capability bits */
 109 enum {
 110         /* device supports settings parameter via USB */
 111         LINE6_CAP_CONTROL =     1 << 0,
 112         /* device supports PCM input/output via USB */
 113         LINE6_CAP_PCM =         1 << 1,
 114         /* device supports hardware monitoring */
 115         LINE6_CAP_HWMON =       1 << 2,
 116         /* device requires output data when input is read */
 117         LINE6_CAP_IN_NEEDS_OUT = 1 << 3,
 118         /* device uses raw MIDI via USB (data endpoints) */
 119         LINE6_CAP_CONTROL_MIDI = 1 << 4,
 120         /* device provides low-level information */
 121         LINE6_CAP_CONTROL_INFO = 1 << 5,
 122 };
 123
 124 /*
 125          Common data shared by all Line 6 devices.
 126          Corresponds to a pair of USB endpoints.
 127 */
 128 struct usb_line6 {
 129         /* USB device */
 130         struct usb_device *usbdev;
 131
 132         /* Properties */
 133         const struct line6_properties *properties;
 134
 135         /* Interval for data USB packets */
 136         int interval;
 137         /* ...for isochronous transfers framing */
 138         int intervals_per_second;
 139
 140         /* Number of isochronous URBs used for frame transfers */
 141         int iso_buffers;
 142
 143         /* Maximum size of data USB packet */
 144         int max_packet_size;
 145
 146         /* Device representing the USB interface */
 147         struct device *ifcdev;
 148
 149         /* Line 6 sound card data structure.
 150          * Each device has at least MIDI or PCM.
 151          */
 152         struct snd_card *card;
 153
 154         /* Line 6 PCM device data structure */
 155         struct snd_line6_pcm *line6pcm;
 156
 157         /* Line 6 MIDI device data structure */
 158         struct snd_line6_midi *line6midi;
 159
 160         /* URB for listening to POD data endpoint */
 161         struct urb *urb_listen;
 162
 163         /* Buffer for incoming data from POD data endpoint */
 164         unsigned char *buffer_listen;
 165
 166         /* Buffer for message to be processed, generated from MIDI layer */
 167         unsigned char *buffer_message;
 168
 169         /* Length of message to be processed, generated from MIDI layer  */
 170         int message_length;
 171
 172         /* Circular buffer for non-MIDI control messages */
 173         struct {
 174                 struct mutex read_lock;
 175                 wait_queue_head_t wait_queue;
 176                 unsigned int active:1;
 177                 STRUCT_KFIFO_REC_2(LINE6_BUFSIZE_LISTEN * LINE6_RAW_MESSAGES_MAXCOUNT)
 178                         fifo;
 179         } messages;
 180
 181         /* If MIDI is supported, buffer_message contains the pre-processed data;
 182          * otherwise the data is only in urb_listen (buffer_incoming).
 183          */
 184         void (*process_message)(struct usb_line6 *);
 185         void (*disconnect)(struct usb_line6 *line6);
 186 };
 187
 188 extern char *line6_alloc_sysex_buffer(struct usb_line6 *line6, int code1,
 189                                       int code2, int size);
 190 extern int line6_read_data(struct usb_line6 *line6, unsigned address,
 191                            void *data, unsigned datalen);
 192 extern int line6_read_serial_number(struct usb_line6 *line6,
 193                                     u32 *serial_number);
 194 extern int line6_send_raw_message_async(struct usb_line6 *line6,
 195                                         const char *buffer, int size);
 196 extern int line6_send_sysex_message(struct usb_line6 *line6,
 197                                     const char *buffer, int size);
 198 extern ssize_t line6_set_raw(struct device *dev, struct device_attribute *attr,
 199                              const char *buf, size_t count);
 200 extern void line6_start_timer(struct timer_list *timer, unsigned long msecs,
 201                               void (*function)(struct timer_list *t));
 202 extern int line6_version_request_async(struct usb_line6 *line6);
 203 extern int line6_write_data(struct usb_line6 *line6, unsigned address,
 204                             void *data, unsigned datalen);
 205
 206 int line6_probe(struct usb_interface *interface,
 207                 const struct usb_device_id *id,
 208                 const char *driver_name,
 209                 const struct line6_properties *properties,
 210                 int (*private_init)(struct usb_line6 *, const struct usb_device_id *id),
 211                 size_t data_size);
 212
 213 void line6_disconnect(struct usb_interface *interface);
 214
 215 #ifdef CONFIG_PM
 216 int line6_suspend(struct usb_interface *interface, pm_message_t message);
 217 int line6_resume(struct usb_interface *interface);
 218 #endif
 219
 220 #endif