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 char* cobra_name = "Creative Labs Blaster GamePad Cobra"; 48 49 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 }; 50 51 struct cobra { 52 struct gameport *gameport; 53 struct input_dev dev[2]; 54 int reads; 55 int bads; 56 unsigned char exists; 57 char phys[2][32]; 58 }; 59 60 static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data) 61 { 62 unsigned long flags; 63 unsigned char u, v, w; 64 __u64 buf[2]; 65 int r[2], t[2]; 66 int i, j, ret; 67 68 int strobe = gameport_time(gameport, COBRA_MAX_STROBE); 69 70 for (i = 0; i < 2; i++) { 71 r[i] = buf[i] = 0; 72 t[i] = COBRA_MAX_STROBE; 73 } 74 75 local_irq_save(flags); 76 77 u = gameport_read(gameport); 78 79 do { 80 t[0]--; t[1]--; 81 v = gameport_read(gameport); 82 for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2) 83 if (w & 0x30) { 84 if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) { 85 buf[i] |= (__u64)((w >> 5) & 1) << r[i]++; 86 t[i] = strobe; 87 u = v; 88 } else t[i] = 0; 89 } 90 } while (t[0] > 0 || t[1] > 0); 91 92 local_irq_restore(flags); 93 94 ret = 0; 95 96 for (i = 0; i < 2; i++) { 97 98 if (r[i] != COBRA_LENGTH) continue; 99 100 for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++) 101 buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1)); 102 103 if (j < COBRA_LENGTH) ret |= (1 << i); 104 105 data[i] = ((buf[i] >> 7) & 0x000001f) | ((buf[i] >> 8) & 0x00003e0) 106 | ((buf[i] >> 9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000) 107 | ((buf[i] >> 11) & 0x1f00000); 108 109 } 110 111 return ret; 112 } 113 114 static void cobra_poll(struct gameport *gameport) 115 { 116 struct cobra *cobra = gameport_get_drvdata(gameport); 117 struct input_dev *dev; 118 unsigned int data[2]; 119 int i, j, r; 120 121 cobra->reads++; 122 123 if ((r = cobra_read_packet(gameport, data)) != cobra->exists) { 124 cobra->bads++; 125 return; 126 } 127 128 for (i = 0; i < 2; i++) 129 if (cobra->exists & r & (1 << i)) { 130 131 dev = cobra->dev + i; 132 133 input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1)); 134 input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1)); 135 136 for (j = 0; cobra_btn[j]; j++) 137 input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j)); 138 139 input_sync(dev); 140 141 } 142 } 143 144 static int cobra_open(struct input_dev *dev) 145 { 146 struct cobra *cobra = dev->private; 147 148 gameport_start_polling(cobra->gameport); 149 return 0; 150 } 151 152 static void cobra_close(struct input_dev *dev) 153 { 154 struct cobra *cobra = dev->private; 155 156 gameport_stop_polling(cobra->gameport); 157 } 158 159 static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv) 160 { 161 struct cobra *cobra; 162 unsigned int data[2]; 163 int i, j; 164 int err; 165 166 if (!(cobra = kcalloc(1, sizeof(struct cobra), GFP_KERNEL))) 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) { 196 197 sprintf(cobra->phys[i], "%s/input%d", gameport->phys, i); 198 199 cobra->dev[i].private = cobra; 200 cobra->dev[i].open = cobra_open; 201 cobra->dev[i].close = cobra_close; 202 203 cobra->dev[i].name = cobra_name; 204 cobra->dev[i].phys = cobra->phys[i]; 205 cobra->dev[i].id.bustype = BUS_GAMEPORT; 206 cobra->dev[i].id.vendor = GAMEPORT_ID_VENDOR_CREATIVE; 207 cobra->dev[i].id.product = 0x0008; 208 cobra->dev[i].id.version = 0x0100; 209 210 cobra->dev[i].evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); 211 212 input_set_abs_params(&cobra->dev[i], ABS_X, -1, 1, 0, 0); 213 input_set_abs_params(&cobra->dev[i], ABS_Y, -1, 1, 0, 0); 214 215 for (j = 0; cobra_btn[j]; j++) 216 set_bit(cobra_btn[j], cobra->dev[i].keybit); 217 218 input_register_device(&cobra->dev[i]); 219 printk(KERN_INFO "input: %s on %s\n", cobra_name, gameport->phys); 220 } 221 222 return 0; 223 224 fail2: gameport_close(gameport); 225 fail1: gameport_set_drvdata(gameport, NULL); 226 kfree(cobra); 227 return err; 228 } 229 230 static void cobra_disconnect(struct gameport *gameport) 231 { 232 struct cobra *cobra = gameport_get_drvdata(gameport); 233 int i; 234 235 for (i = 0; i < 2; i++) 236 if ((cobra->exists >> i) & 1) 237 input_unregister_device(cobra->dev + i); 238 gameport_close(gameport); 239 gameport_set_drvdata(gameport, NULL); 240 kfree(cobra); 241 } 242 243 static struct gameport_driver cobra_drv = { 244 .driver = { 245 .name = "cobra", 246 }, 247 .description = DRIVER_DESC, 248 .connect = cobra_connect, 249 .disconnect = cobra_disconnect, 250 }; 251 252 static int __init cobra_init(void) 253 { 254 gameport_register_driver(&cobra_drv); 255 return 0; 256 } 257 258 static void __exit cobra_exit(void) 259 { 260 gameport_unregister_driver(&cobra_drv); 261 } 262 263 module_init(cobra_init); 264 module_exit(cobra_exit); 265