248 lines
6.1 KiB
C
248 lines
6.1 KiB
C
/*
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* Line6 Linux USB driver - 0.9.1beta
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*
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* Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation, version 2.
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*
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*/
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#include <linux/slab.h>
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#include "audio.h"
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#include "driver.h"
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#include "variax.h"
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#define VARIAX_OFFSET_ACTIVATE 7
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/*
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This message is sent by the device during initialization and identifies
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the connected guitar version.
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*/
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static const char variax_init_version[] = {
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0xf0, 0x7e, 0x7f, 0x06, 0x02, 0x00, 0x01, 0x0c,
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0x07, 0x00, 0x00, 0x00
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};
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/*
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This message is the last one sent by the device during initialization.
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*/
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static const char variax_init_done[] = {
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0xf0, 0x00, 0x01, 0x0c, 0x07, 0x00, 0x6b
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};
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static const char variax_activate[] = {
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0xf0, 0x00, 0x01, 0x0c, 0x07, 0x00, 0x2a, 0x01,
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0xf7
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};
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/* forward declarations: */
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static void variax_startup2(unsigned long data);
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static void variax_startup4(unsigned long data);
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static void variax_startup5(unsigned long data);
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static void variax_activate_async(struct usb_line6_variax *variax, int a)
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{
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variax->buffer_activate[VARIAX_OFFSET_ACTIVATE] = a;
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line6_send_raw_message_async(&variax->line6, variax->buffer_activate,
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sizeof(variax_activate));
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}
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/*
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Variax startup procedure.
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This is a sequence of functions with special requirements (e.g., must
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not run immediately after initialization, must not run in interrupt
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context). After the last one has finished, the device is ready to use.
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*/
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static void variax_startup1(struct usb_line6_variax *variax)
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{
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CHECK_STARTUP_PROGRESS(variax->startup_progress, VARIAX_STARTUP_INIT);
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/* delay startup procedure: */
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line6_start_timer(&variax->startup_timer1, VARIAX_STARTUP_DELAY1,
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variax_startup2, (unsigned long)variax);
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}
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static void variax_startup2(unsigned long data)
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{
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struct usb_line6_variax *variax = (struct usb_line6_variax *)data;
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struct usb_line6 *line6 = &variax->line6;
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/* schedule another startup procedure until startup is complete: */
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if (variax->startup_progress >= VARIAX_STARTUP_LAST)
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return;
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variax->startup_progress = VARIAX_STARTUP_VERSIONREQ;
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line6_start_timer(&variax->startup_timer1, VARIAX_STARTUP_DELAY1,
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variax_startup2, (unsigned long)variax);
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/* request firmware version: */
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line6_version_request_async(line6);
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}
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static void variax_startup3(struct usb_line6_variax *variax)
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{
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CHECK_STARTUP_PROGRESS(variax->startup_progress, VARIAX_STARTUP_WAIT);
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/* delay startup procedure: */
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line6_start_timer(&variax->startup_timer2, VARIAX_STARTUP_DELAY3,
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variax_startup4, (unsigned long)variax);
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}
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static void variax_startup4(unsigned long data)
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{
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struct usb_line6_variax *variax = (struct usb_line6_variax *)data;
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CHECK_STARTUP_PROGRESS(variax->startup_progress,
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VARIAX_STARTUP_ACTIVATE);
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/* activate device: */
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variax_activate_async(variax, 1);
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line6_start_timer(&variax->startup_timer2, VARIAX_STARTUP_DELAY4,
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variax_startup5, (unsigned long)variax);
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}
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static void variax_startup5(unsigned long data)
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{
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struct usb_line6_variax *variax = (struct usb_line6_variax *)data;
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CHECK_STARTUP_PROGRESS(variax->startup_progress,
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VARIAX_STARTUP_WORKQUEUE);
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/* schedule work for global work queue: */
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schedule_work(&variax->startup_work);
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}
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static void variax_startup6(struct work_struct *work)
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{
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struct usb_line6_variax *variax =
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container_of(work, struct usb_line6_variax, startup_work);
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CHECK_STARTUP_PROGRESS(variax->startup_progress, VARIAX_STARTUP_SETUP);
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/* ALSA audio interface: */
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line6_register_audio(&variax->line6);
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}
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/*
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Process a completely received message.
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*/
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void line6_variax_process_message(struct usb_line6_variax *variax)
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{
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const unsigned char *buf = variax->line6.buffer_message;
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switch (buf[0]) {
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case LINE6_PARAM_CHANGE | LINE6_CHANNEL_HOST:
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break;
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case LINE6_PROGRAM_CHANGE | LINE6_CHANNEL_DEVICE:
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case LINE6_PROGRAM_CHANGE | LINE6_CHANNEL_HOST:
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break;
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case LINE6_RESET:
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dev_info(variax->line6.ifcdev, "VARIAX reset\n");
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break;
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case LINE6_SYSEX_BEGIN:
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if (memcmp(buf + 1, variax_init_version + 1,
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sizeof(variax_init_version) - 1) == 0) {
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variax_startup3(variax);
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} else if (memcmp(buf + 1, variax_init_done + 1,
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sizeof(variax_init_done) - 1) == 0) {
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/* notify of complete initialization: */
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variax_startup4((unsigned long)variax);
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}
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break;
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case LINE6_SYSEX_END:
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break;
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default:
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dev_dbg(variax->line6.ifcdev,
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"Variax: unknown message %02X\n", buf[0]);
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}
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}
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/*
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Variax destructor.
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*/
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static void variax_destruct(struct usb_interface *interface)
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{
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struct usb_line6_variax *variax = usb_get_intfdata(interface);
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if (variax == NULL)
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return;
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line6_cleanup_audio(&variax->line6);
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del_timer(&variax->startup_timer1);
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del_timer(&variax->startup_timer2);
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cancel_work_sync(&variax->startup_work);
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kfree(variax->buffer_activate);
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}
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/*
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Try to init workbench device.
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*/
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static int variax_try_init(struct usb_interface *interface,
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struct usb_line6_variax *variax)
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{
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int err;
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init_timer(&variax->startup_timer1);
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init_timer(&variax->startup_timer2);
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INIT_WORK(&variax->startup_work, variax_startup6);
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if ((interface == NULL) || (variax == NULL))
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return -ENODEV;
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/* initialize USB buffers: */
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variax->buffer_activate = kmemdup(variax_activate,
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sizeof(variax_activate), GFP_KERNEL);
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if (variax->buffer_activate == NULL) {
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dev_err(&interface->dev, "Out of memory\n");
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return -ENOMEM;
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}
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/* initialize audio system: */
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err = line6_init_audio(&variax->line6);
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if (err < 0)
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return err;
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/* initialize MIDI subsystem: */
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err = line6_init_midi(&variax->line6);
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if (err < 0)
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return err;
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/* initiate startup procedure: */
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variax_startup1(variax);
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return 0;
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}
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/*
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Init workbench device (and clean up in case of failure).
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*/
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int line6_variax_init(struct usb_interface *interface,
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struct usb_line6_variax *variax)
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{
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int err = variax_try_init(interface, variax);
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if (err < 0)
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variax_destruct(interface);
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return err;
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}
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/*
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Workbench device disconnected.
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*/
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void line6_variax_disconnect(struct usb_interface *interface)
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{
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if (interface == NULL)
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return;
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variax_destruct(interface);
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}
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