1 /* 2 * $Id: cobra.c,v 1.19 2002/01/22 20:26:52 vojtech Exp $ 3 * 4 * Copyright (c) 1999-2001 Vojtech Pavlik 5 */ 6 7 /* 8 * Creative Labs Blaster GamePad Cobra driver for Linux 9 */ 10 11 /* 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25 * 26 * Should you need to contact me, the author, you can do so either by 27 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: 28 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic 29 */ 30 31 #include <linux/kernel.h> 32 #include <linux/module.h> 33 #include <linux/slab.h> 34 #include <linux/init.h> 35 #include <linux/gameport.h> 36 #include <linux/input.h> 37 38 #define DRIVER_DESC "Creative Labs Blaster GamePad Cobra driver" 39 40 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 41 MODULE_DESCRIPTION(DRIVER_DESC); 42 MODULE_LICENSE("GPL"); 43 44 #define COBRA_MAX_STROBE 45 /* 45 us max wait for first strobe */ 45 #define COBRA_LENGTH 36 46 47 static int cobra_btn[] = { BTN_START, BTN_SELECT, BTN_TL, BTN_TR, BTN_X, BTN_Y, BTN_Z, BTN_A, BTN_B, BTN_C, BTN_TL2, BTN_TR2, 0 }; 48 49 struct cobra { 50 struct gameport *gameport; 51 struct input_dev *dev[2]; 52 int reads; 53 int bads; 54 unsigned char exists; 55 char phys[2][32]; 56 }; 57 58 static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data) 59 { 60 unsigned long flags; 61 unsigned char u, v, w; 62 __u64 buf[2]; 63 int r[2], t[2]; 64 int i, j, ret; 65 66 int strobe = gameport_time(gameport, COBRA_MAX_STROBE); 67 68 for (i = 0; i < 2; i++) { 69 r[i] = buf[i] = 0; 70 t[i] = COBRA_MAX_STROBE; 71 } 72 73 local_irq_save(flags); 74 75 u = gameport_read(gameport); 76 77 do { 78 t[0]--; t[1]--; 79 v = gameport_read(gameport); 80 for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2) 81 if (w & 0x30) { 82 if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) { 83 buf[i] |= (__u64)((w >> 5) & 1) << r[i]++; 84 t[i] = strobe; 85 u = v; 86 } else t[i] = 0; 87 } 88 } while (t[0] > 0 || t[1] > 0); 89 90 local_irq_restore(flags); 91 92 ret = 0; 93 94 for (i = 0; i < 2; i++) { 95 96 if (r[i] != COBRA_LENGTH) continue; 97 98 for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++) 99 buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1)); 100 101 if (j < COBRA_LENGTH) ret |= (1 << i); 102 103 data[i] = ((buf[i] >> 7) & 0x000001f) | ((buf[i] >> 8) & 0x00003e0) 104 | ((buf[i] >> 9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000) 105 | ((buf[i] >> 11) & 0x1f00000); 106 107 } 108 109 return ret; 110 } 111 112 static void cobra_poll(struct gameport *gameport) 113 { 114 struct cobra *cobra = gameport_get_drvdata(gameport); 115 struct input_dev *dev; 116 unsigned int data[2]; 117 int i, j, r; 118 119 cobra->reads++; 120 121 if ((r = cobra_read_packet(gameport, data)) != cobra->exists) { 122 cobra->bads++; 123 return; 124 } 125 126 for (i = 0; i < 2; i++) 127 if (cobra->exists & r & (1 << i)) { 128 129 dev = cobra->dev[i]; 130 131 input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1)); 132 input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1)); 133 134 for (j = 0; cobra_btn[j]; j++) 135 input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j)); 136 137 input_sync(dev); 138 139 } 140 } 141 142 static int cobra_open(struct input_dev *dev) 143 { 144 struct cobra *cobra = dev->private; 145 146 gameport_start_polling(cobra->gameport); 147 return 0; 148 } 149 150 static void cobra_close(struct input_dev *dev) 151 { 152 struct cobra *cobra = dev->private; 153 154 gameport_stop_polling(cobra->gameport); 155 } 156 157 static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv) 158 { 159 struct cobra *cobra; 160 struct input_dev *input_dev; 161 unsigned int data[2]; 162 int i, j; 163 int err; 164 165 cobra = kzalloc(sizeof(struct cobra), GFP_KERNEL); 166 if (!cobra) 167 return -ENOMEM; 168 169 cobra->gameport = gameport; 170 171 gameport_set_drvdata(gameport, cobra); 172 173 err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW); 174 if (err) 175 goto fail1; 176 177 cobra->exists = cobra_read_packet(gameport, data); 178 179 for (i = 0; i < 2; i++) 180 if ((cobra->exists >> i) & data[i] & 1) { 181 printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d" 182 " Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7); 183 cobra->exists &= ~(1 << i); 184 } 185 186 if (!cobra->exists) { 187 err = -ENODEV; 188 goto fail2; 189 } 190 191 gameport_set_poll_handler(gameport, cobra_poll); 192 gameport_set_poll_interval(gameport, 20); 193 194 for (i = 0; i < 2; i++) { 195 if (~(cobra->exists >> i) & 1) 196 continue; 197 198 cobra->dev[i] = input_dev = input_allocate_device(); 199 if (!input_dev) { 200 err = -ENOMEM; 201 goto fail3; 202 } 203 204 sprintf(cobra->phys[i], "%s/input%d", gameport->phys, i); 205 206 input_dev->name = "Creative Labs Blaster GamePad Cobra"; 207 input_dev->phys = cobra->phys[i]; 208 input_dev->id.bustype = BUS_GAMEPORT; 209 input_dev->id.vendor = GAMEPORT_ID_VENDOR_CREATIVE; 210 input_dev->id.product = 0x0008; 211 input_dev->id.version = 0x0100; 212 input_dev->cdev.dev = &gameport->dev; 213 input_dev->private = cobra; 214 215 input_dev->open = cobra_open; 216 input_dev->close = cobra_close; 217 218 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); 219 input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0); 220 input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0); 221 for (j = 0; cobra_btn[j]; j++) 222 set_bit(cobra_btn[j], input_dev->keybit); 223 224 input_register_device(cobra->dev[i]); 225 } 226 227 return 0; 228 229 fail3: for (i = 0; i < 2; i++) 230 if (cobra->dev[i]) 231 input_unregister_device(cobra->dev[i]); 232 fail2: gameport_close(gameport); 233 fail1: gameport_set_drvdata(gameport, NULL); 234 kfree(cobra); 235 return err; 236 } 237 238 static void cobra_disconnect(struct gameport *gameport) 239 { 240 struct cobra *cobra = gameport_get_drvdata(gameport); 241 int i; 242 243 for (i = 0; i < 2; i++) 244 if ((cobra->exists >> i) & 1) 245 input_unregister_device(cobra->dev[i]); 246 gameport_close(gameport); 247 gameport_set_drvdata(gameport, NULL); 248 kfree(cobra); 249 } 250 251 static struct gameport_driver cobra_drv = { 252 .driver = { 253 .name = "cobra", 254 }, 255 .description = DRIVER_DESC, 256 .connect = cobra_connect, 257 .disconnect = cobra_disconnect, 258 }; 259 260 static int __init cobra_init(void) 261 { 262 gameport_register_driver(&cobra_drv); 263 return 0; 264 } 265 266 static void __exit cobra_exit(void) 267 { 268 gameport_unregister_driver(&cobra_drv); 269 } 270 271 module_init(cobra_init); 272 module_exit(cobra_exit); 273