1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Line 6 Linux USB driver 4 * 5 * Copyright (C) 2004-2010 Markus Grabner (grabner@icg.tugraz.at) 6 */ 7 8 #include <linux/slab.h> 9 #include <linux/spinlock.h> 10 #include <linux/usb.h> 11 #include <linux/wait.h> 12 #include <linux/module.h> 13 #include <sound/core.h> 14 15 #include "driver.h" 16 17 #define VARIAX_STARTUP_DELAY1 1000 18 #define VARIAX_STARTUP_DELAY3 100 19 #define VARIAX_STARTUP_DELAY4 100 20 21 /* 22 Stages of Variax startup procedure 23 */ 24 enum { 25 VARIAX_STARTUP_VERSIONREQ, 26 VARIAX_STARTUP_ACTIVATE, 27 VARIAX_STARTUP_SETUP, 28 }; 29 30 enum { 31 LINE6_PODXTLIVE_VARIAX, 32 LINE6_VARIAX 33 }; 34 35 struct usb_line6_variax { 36 /* Generic Line 6 USB data */ 37 struct usb_line6 line6; 38 39 /* Buffer for activation code */ 40 unsigned char *buffer_activate; 41 42 /* Current progress in startup procedure */ 43 int startup_progress; 44 }; 45 46 #define line6_to_variax(x) container_of(x, struct usb_line6_variax, line6) 47 48 #define VARIAX_OFFSET_ACTIVATE 7 49 50 /* 51 This message is sent by the device during initialization and identifies 52 the connected guitar version. 53 */ 54 static const char variax_init_version[] = { 55 0xf0, 0x7e, 0x7f, 0x06, 0x02, 0x00, 0x01, 0x0c, 56 0x07, 0x00, 0x00, 0x00 57 }; 58 59 /* 60 This message is the last one sent by the device during initialization. 61 */ 62 static const char variax_init_done[] = { 63 0xf0, 0x00, 0x01, 0x0c, 0x07, 0x00, 0x6b 64 }; 65 66 static const char variax_activate[] = { 67 0xf0, 0x00, 0x01, 0x0c, 0x07, 0x00, 0x2a, 0x01, 68 0xf7 69 }; 70 71 static void variax_activate_async(struct usb_line6_variax *variax, int a) 72 { 73 variax->buffer_activate[VARIAX_OFFSET_ACTIVATE] = a; 74 line6_send_raw_message_async(&variax->line6, variax->buffer_activate, 75 sizeof(variax_activate)); 76 } 77 78 /* 79 Variax startup procedure. 80 This is a sequence of functions with special requirements (e.g., must 81 not run immediately after initialization, must not run in interrupt 82 context). After the last one has finished, the device is ready to use. 83 */ 84 85 static void variax_startup(struct usb_line6 *line6) 86 { 87 struct usb_line6_variax *variax = line6_to_variax(line6); 88 89 switch (variax->startup_progress) { 90 case VARIAX_STARTUP_VERSIONREQ: 91 /* repeat request until getting the response */ 92 schedule_delayed_work(&line6->startup_work, 93 msecs_to_jiffies(VARIAX_STARTUP_DELAY1)); 94 /* request firmware version: */ 95 line6_version_request_async(line6); 96 break; 97 case VARIAX_STARTUP_ACTIVATE: 98 /* activate device: */ 99 variax_activate_async(variax, 1); 100 variax->startup_progress = VARIAX_STARTUP_SETUP; 101 schedule_delayed_work(&line6->startup_work, 102 msecs_to_jiffies(VARIAX_STARTUP_DELAY4)); 103 break; 104 case VARIAX_STARTUP_SETUP: 105 /* ALSA audio interface: */ 106 snd_card_register(variax->line6.card); 107 break; 108 } 109 } 110 111 /* 112 Process a completely received message. 113 */ 114 static void line6_variax_process_message(struct usb_line6 *line6) 115 { 116 struct usb_line6_variax *variax = line6_to_variax(line6); 117 const unsigned char *buf = variax->line6.buffer_message; 118 119 switch (buf[0]) { 120 case LINE6_RESET: 121 dev_info(variax->line6.ifcdev, "VARIAX reset\n"); 122 break; 123 124 case LINE6_SYSEX_BEGIN: 125 if (memcmp(buf + 1, variax_init_version + 1, 126 sizeof(variax_init_version) - 1) == 0) { 127 if (variax->startup_progress >= VARIAX_STARTUP_ACTIVATE) 128 break; 129 variax->startup_progress = VARIAX_STARTUP_ACTIVATE; 130 cancel_delayed_work(&line6->startup_work); 131 schedule_delayed_work(&line6->startup_work, 132 msecs_to_jiffies(VARIAX_STARTUP_DELAY3)); 133 } else if (memcmp(buf + 1, variax_init_done + 1, 134 sizeof(variax_init_done) - 1) == 0) { 135 /* notify of complete initialization: */ 136 if (variax->startup_progress >= VARIAX_STARTUP_SETUP) 137 break; 138 cancel_delayed_work(&line6->startup_work); 139 schedule_delayed_work(&line6->startup_work, 0); 140 } 141 break; 142 } 143 } 144 145 /* 146 Variax destructor. 147 */ 148 static void line6_variax_disconnect(struct usb_line6 *line6) 149 { 150 struct usb_line6_variax *variax = line6_to_variax(line6); 151 152 kfree(variax->buffer_activate); 153 } 154 155 /* 156 Try to init workbench device. 157 */ 158 static int variax_init(struct usb_line6 *line6, 159 const struct usb_device_id *id) 160 { 161 struct usb_line6_variax *variax = line6_to_variax(line6); 162 163 line6->process_message = line6_variax_process_message; 164 line6->disconnect = line6_variax_disconnect; 165 line6->startup = variax_startup; 166 167 /* initialize USB buffers: */ 168 variax->buffer_activate = kmemdup(variax_activate, 169 sizeof(variax_activate), GFP_KERNEL); 170 171 if (variax->buffer_activate == NULL) 172 return -ENOMEM; 173 174 /* initiate startup procedure: */ 175 schedule_delayed_work(&line6->startup_work, 176 msecs_to_jiffies(VARIAX_STARTUP_DELAY1)); 177 return 0; 178 } 179 180 #define LINE6_DEVICE(prod) USB_DEVICE(0x0e41, prod) 181 #define LINE6_IF_NUM(prod, n) USB_DEVICE_INTERFACE_NUMBER(0x0e41, prod, n) 182 183 /* table of devices that work with this driver */ 184 static const struct usb_device_id variax_id_table[] = { 185 { LINE6_IF_NUM(0x4650, 1), .driver_info = LINE6_PODXTLIVE_VARIAX }, 186 { LINE6_DEVICE(0x534d), .driver_info = LINE6_VARIAX }, 187 {} 188 }; 189 190 MODULE_DEVICE_TABLE(usb, variax_id_table); 191 192 static const struct line6_properties variax_properties_table[] = { 193 [LINE6_PODXTLIVE_VARIAX] = { 194 .id = "PODxtLive", 195 .name = "PODxt Live", 196 .capabilities = LINE6_CAP_CONTROL 197 | LINE6_CAP_CONTROL_MIDI, 198 .altsetting = 1, 199 .ep_ctrl_r = 0x86, 200 .ep_ctrl_w = 0x05, 201 .ep_audio_r = 0x82, 202 .ep_audio_w = 0x01, 203 }, 204 [LINE6_VARIAX] = { 205 .id = "Variax", 206 .name = "Variax Workbench", 207 .capabilities = LINE6_CAP_CONTROL 208 | LINE6_CAP_CONTROL_MIDI, 209 .altsetting = 1, 210 .ep_ctrl_r = 0x82, 211 .ep_ctrl_w = 0x01, 212 /* no audio channel */ 213 } 214 }; 215 216 /* 217 Probe USB device. 218 */ 219 static int variax_probe(struct usb_interface *interface, 220 const struct usb_device_id *id) 221 { 222 return line6_probe(interface, id, "Line6-Variax", 223 &variax_properties_table[id->driver_info], 224 variax_init, sizeof(struct usb_line6_variax)); 225 } 226 227 static struct usb_driver variax_driver = { 228 .name = KBUILD_MODNAME, 229 .probe = variax_probe, 230 .disconnect = line6_disconnect, 231 #ifdef CONFIG_PM 232 .suspend = line6_suspend, 233 .resume = line6_resume, 234 .reset_resume = line6_resume, 235 #endif 236 .id_table = variax_id_table, 237 }; 238 239 module_usb_driver(variax_driver); 240 241 MODULE_DESCRIPTION("Variax Workbench USB driver"); 242 MODULE_LICENSE("GPL"); 243