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 #include <linux/jiffies.h> 38 39 #define DRIVER_DESC "Creative Labs Blaster GamePad Cobra driver" 40 41 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 42 MODULE_DESCRIPTION(DRIVER_DESC); 43 MODULE_LICENSE("GPL"); 44 45 #define COBRA_MAX_STROBE 45 /* 45 us max wait for first strobe */ 46 #define COBRA_LENGTH 36 47 48 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 }; 49 50 struct cobra { 51 struct gameport *gameport; 52 struct input_dev *dev[2]; 53 int reads; 54 int bads; 55 unsigned char exists; 56 char phys[2][32]; 57 }; 58 59 static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data) 60 { 61 unsigned long flags; 62 unsigned char u, v, w; 63 __u64 buf[2]; 64 int r[2], t[2]; 65 int i, j, ret; 66 67 int strobe = gameport_time(gameport, COBRA_MAX_STROBE); 68 69 for (i = 0; i < 2; i++) { 70 r[i] = buf[i] = 0; 71 t[i] = COBRA_MAX_STROBE; 72 } 73 74 local_irq_save(flags); 75 76 u = gameport_read(gameport); 77 78 do { 79 t[0]--; t[1]--; 80 v = gameport_read(gameport); 81 for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2) 82 if (w & 0x30) { 83 if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) { 84 buf[i] |= (__u64)((w >> 5) & 1) << r[i]++; 85 t[i] = strobe; 86 u = v; 87 } else t[i] = 0; 88 } 89 } while (t[0] > 0 || t[1] > 0); 90 91 local_irq_restore(flags); 92 93 ret = 0; 94 95 for (i = 0; i < 2; i++) { 96 97 if (r[i] != COBRA_LENGTH) continue; 98 99 for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++) 100 buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1)); 101 102 if (j < COBRA_LENGTH) ret |= (1 << i); 103 104 data[i] = ((buf[i] >> 7) & 0x000001f) | ((buf[i] >> 8) & 0x00003e0) 105 | ((buf[i] >> 9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000) 106 | ((buf[i] >> 11) & 0x1f00000); 107 108 } 109 110 return ret; 111 } 112 113 static void cobra_poll(struct gameport *gameport) 114 { 115 struct cobra *cobra = gameport_get_drvdata(gameport); 116 struct input_dev *dev; 117 unsigned int data[2]; 118 int i, j, r; 119 120 cobra->reads++; 121 122 if ((r = cobra_read_packet(gameport, data)) != cobra->exists) { 123 cobra->bads++; 124 return; 125 } 126 127 for (i = 0; i < 2; i++) 128 if (cobra->exists & r & (1 << i)) { 129 130 dev = cobra->dev[i]; 131 132 input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1)); 133 input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1)); 134 135 for (j = 0; cobra_btn[j]; j++) 136 input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j)); 137 138 input_sync(dev); 139 140 } 141 } 142 143 static int cobra_open(struct input_dev *dev) 144 { 145 struct cobra *cobra = dev->private; 146 147 gameport_start_polling(cobra->gameport); 148 return 0; 149 } 150 151 static void cobra_close(struct input_dev *dev) 152 { 153 struct cobra *cobra = dev->private; 154 155 gameport_stop_polling(cobra->gameport); 156 } 157 158 static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv) 159 { 160 struct cobra *cobra; 161 struct input_dev *input_dev; 162 unsigned int data[2]; 163 int i, j; 164 int err; 165 166 cobra = kzalloc(sizeof(struct cobra), GFP_KERNEL); 167 if (!cobra) 168 return -ENOMEM; 169 170 cobra->gameport = gameport; 171 172 gameport_set_drvdata(gameport, cobra); 173 174 err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW); 175 if (err) 176 goto fail1; 177 178 cobra->exists = cobra_read_packet(gameport, data); 179 180 for (i = 0; i < 2; i++) 181 if ((cobra->exists >> i) & data[i] & 1) { 182 printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d" 183 " Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7); 184 cobra->exists &= ~(1 << i); 185 } 186 187 if (!cobra->exists) { 188 err = -ENODEV; 189 goto fail2; 190 } 191 192 gameport_set_poll_handler(gameport, cobra_poll); 193 gameport_set_poll_interval(gameport, 20); 194 195 for (i = 0; i < 2; i++) { 196 if (~(cobra->exists >> i) & 1) 197 continue; 198 199 cobra->dev[i] = input_dev = input_allocate_device(); 200 if (!input_dev) { 201 err = -ENOMEM; 202 goto fail3; 203 } 204 205 sprintf(cobra->phys[i], "%s/input%d", gameport->phys, i); 206 207 input_dev->name = "Creative Labs Blaster GamePad Cobra"; 208 input_dev->phys = cobra->phys[i]; 209 input_dev->id.bustype = BUS_GAMEPORT; 210 input_dev->id.vendor = GAMEPORT_ID_VENDOR_CREATIVE; 211 input_dev->id.product = 0x0008; 212 input_dev->id.version = 0x0100; 213 input_dev->cdev.dev = &gameport->dev; 214 input_dev->private = cobra; 215 216 input_dev->open = cobra_open; 217 input_dev->close = cobra_close; 218 219 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); 220 input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0); 221 input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0); 222 for (j = 0; cobra_btn[j]; j++) 223 set_bit(cobra_btn[j], input_dev->keybit); 224 225 input_register_device(cobra->dev[i]); 226 } 227 228 return 0; 229 230 fail3: for (i = 0; i < 2; i++) 231 if (cobra->dev[i]) 232 input_unregister_device(cobra->dev[i]); 233 fail2: gameport_close(gameport); 234 fail1: gameport_set_drvdata(gameport, NULL); 235 kfree(cobra); 236 return err; 237 } 238 239 static void cobra_disconnect(struct gameport *gameport) 240 { 241 struct cobra *cobra = gameport_get_drvdata(gameport); 242 int i; 243 244 for (i = 0; i < 2; i++) 245 if ((cobra->exists >> i) & 1) 246 input_unregister_device(cobra->dev[i]); 247 gameport_close(gameport); 248 gameport_set_drvdata(gameport, NULL); 249 kfree(cobra); 250 } 251 252 static struct gameport_driver cobra_drv = { 253 .driver = { 254 .name = "cobra", 255 }, 256 .description = DRIVER_DESC, 257 .connect = cobra_connect, 258 .disconnect = cobra_disconnect, 259 }; 260 261 static int __init cobra_init(void) 262 { 263 gameport_register_driver(&cobra_drv); 264 return 0; 265 } 266 267 static void __exit cobra_exit(void) 268 { 269 gameport_unregister_driver(&cobra_drv); 270 } 271 272 module_init(cobra_init); 273 module_exit(cobra_exit); 274