1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) 1999-2001 Vojtech Pavlik 4 */ 5 6 /* 7 * Creative Labs Blaster GamePad Cobra driver for Linux 8 */ 9 10 /* 11 */ 12 13 #include <linux/kernel.h> 14 #include <linux/module.h> 15 #include <linux/slab.h> 16 #include <linux/gameport.h> 17 #include <linux/input.h> 18 #include <linux/jiffies.h> 19 20 #define DRIVER_DESC "Creative Labs Blaster GamePad Cobra driver" 21 22 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 23 MODULE_DESCRIPTION(DRIVER_DESC); 24 MODULE_LICENSE("GPL"); 25 26 #define COBRA_MAX_STROBE 45 /* 45 us max wait for first strobe */ 27 #define COBRA_LENGTH 36 28 29 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 }; 30 31 struct cobra { 32 struct gameport *gameport; 33 struct input_dev *dev[2]; 34 int reads; 35 int bads; 36 unsigned char exists; 37 char phys[2][32]; 38 }; 39 40 static unsigned char cobra_read_packet(struct gameport *gameport, unsigned int *data) 41 { 42 unsigned long flags; 43 unsigned char u, v, w; 44 __u64 buf[2]; 45 int r[2], t[2]; 46 int i, j, ret; 47 48 int strobe = gameport_time(gameport, COBRA_MAX_STROBE); 49 50 for (i = 0; i < 2; i++) { 51 r[i] = buf[i] = 0; 52 t[i] = COBRA_MAX_STROBE; 53 } 54 55 local_irq_save(flags); 56 57 u = gameport_read(gameport); 58 59 do { 60 t[0]--; t[1]--; 61 v = gameport_read(gameport); 62 for (i = 0, w = u ^ v; i < 2 && w; i++, w >>= 2) 63 if (w & 0x30) { 64 if ((w & 0x30) < 0x30 && r[i] < COBRA_LENGTH && t[i] > 0) { 65 buf[i] |= (__u64)((w >> 5) & 1) << r[i]++; 66 t[i] = strobe; 67 u = v; 68 } else t[i] = 0; 69 } 70 } while (t[0] > 0 || t[1] > 0); 71 72 local_irq_restore(flags); 73 74 ret = 0; 75 76 for (i = 0; i < 2; i++) { 77 78 if (r[i] != COBRA_LENGTH) continue; 79 80 for (j = 0; j < COBRA_LENGTH && (buf[i] & 0x04104107f) ^ 0x041041040; j++) 81 buf[i] = (buf[i] >> 1) | ((__u64)(buf[i] & 1) << (COBRA_LENGTH - 1)); 82 83 if (j < COBRA_LENGTH) ret |= (1 << i); 84 85 data[i] = ((buf[i] >> 7) & 0x000001f) | ((buf[i] >> 8) & 0x00003e0) 86 | ((buf[i] >> 9) & 0x0007c00) | ((buf[i] >> 10) & 0x00f8000) 87 | ((buf[i] >> 11) & 0x1f00000); 88 89 } 90 91 return ret; 92 } 93 94 static void cobra_poll(struct gameport *gameport) 95 { 96 struct cobra *cobra = gameport_get_drvdata(gameport); 97 struct input_dev *dev; 98 unsigned int data[2]; 99 int i, j, r; 100 101 cobra->reads++; 102 103 if ((r = cobra_read_packet(gameport, data)) != cobra->exists) { 104 cobra->bads++; 105 return; 106 } 107 108 for (i = 0; i < 2; i++) 109 if (cobra->exists & r & (1 << i)) { 110 111 dev = cobra->dev[i]; 112 113 input_report_abs(dev, ABS_X, ((data[i] >> 4) & 1) - ((data[i] >> 3) & 1)); 114 input_report_abs(dev, ABS_Y, ((data[i] >> 2) & 1) - ((data[i] >> 1) & 1)); 115 116 for (j = 0; cobra_btn[j]; j++) 117 input_report_key(dev, cobra_btn[j], data[i] & (0x20 << j)); 118 119 input_sync(dev); 120 121 } 122 } 123 124 static int cobra_open(struct input_dev *dev) 125 { 126 struct cobra *cobra = input_get_drvdata(dev); 127 128 gameport_start_polling(cobra->gameport); 129 return 0; 130 } 131 132 static void cobra_close(struct input_dev *dev) 133 { 134 struct cobra *cobra = input_get_drvdata(dev); 135 136 gameport_stop_polling(cobra->gameport); 137 } 138 139 static int cobra_connect(struct gameport *gameport, struct gameport_driver *drv) 140 { 141 struct cobra *cobra; 142 struct input_dev *input_dev; 143 unsigned int data[2]; 144 int i, j; 145 int err; 146 147 cobra = kzalloc(sizeof(struct cobra), GFP_KERNEL); 148 if (!cobra) 149 return -ENOMEM; 150 151 cobra->gameport = gameport; 152 153 gameport_set_drvdata(gameport, cobra); 154 155 err = gameport_open(gameport, drv, GAMEPORT_MODE_RAW); 156 if (err) 157 goto fail1; 158 159 cobra->exists = cobra_read_packet(gameport, data); 160 161 for (i = 0; i < 2; i++) 162 if ((cobra->exists >> i) & data[i] & 1) { 163 printk(KERN_WARNING "cobra.c: Device %d on %s has the Ext bit set. ID is: %d" 164 " Contact vojtech@ucw.cz\n", i, gameport->phys, (data[i] >> 2) & 7); 165 cobra->exists &= ~(1 << i); 166 } 167 168 if (!cobra->exists) { 169 err = -ENODEV; 170 goto fail2; 171 } 172 173 gameport_set_poll_handler(gameport, cobra_poll); 174 gameport_set_poll_interval(gameport, 20); 175 176 for (i = 0; i < 2; i++) { 177 if (~(cobra->exists >> i) & 1) 178 continue; 179 180 cobra->dev[i] = input_dev = input_allocate_device(); 181 if (!input_dev) { 182 err = -ENOMEM; 183 goto fail3; 184 } 185 186 snprintf(cobra->phys[i], sizeof(cobra->phys[i]), 187 "%s/input%d", gameport->phys, i); 188 189 input_dev->name = "Creative Labs Blaster GamePad Cobra"; 190 input_dev->phys = cobra->phys[i]; 191 input_dev->id.bustype = BUS_GAMEPORT; 192 input_dev->id.vendor = GAMEPORT_ID_VENDOR_CREATIVE; 193 input_dev->id.product = 0x0008; 194 input_dev->id.version = 0x0100; 195 input_dev->dev.parent = &gameport->dev; 196 197 input_set_drvdata(input_dev, cobra); 198 199 input_dev->open = cobra_open; 200 input_dev->close = cobra_close; 201 202 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 203 input_set_abs_params(input_dev, ABS_X, -1, 1, 0, 0); 204 input_set_abs_params(input_dev, ABS_Y, -1, 1, 0, 0); 205 for (j = 0; cobra_btn[j]; j++) 206 set_bit(cobra_btn[j], input_dev->keybit); 207 208 err = input_register_device(cobra->dev[i]); 209 if (err) 210 goto fail4; 211 } 212 213 return 0; 214 215 fail4: input_free_device(cobra->dev[i]); 216 fail3: while (--i >= 0) 217 if (cobra->dev[i]) 218 input_unregister_device(cobra->dev[i]); 219 fail2: gameport_close(gameport); 220 fail1: gameport_set_drvdata(gameport, NULL); 221 kfree(cobra); 222 return err; 223 } 224 225 static void cobra_disconnect(struct gameport *gameport) 226 { 227 struct cobra *cobra = gameport_get_drvdata(gameport); 228 int i; 229 230 for (i = 0; i < 2; i++) 231 if ((cobra->exists >> i) & 1) 232 input_unregister_device(cobra->dev[i]); 233 gameport_close(gameport); 234 gameport_set_drvdata(gameport, NULL); 235 kfree(cobra); 236 } 237 238 static struct gameport_driver cobra_drv = { 239 .driver = { 240 .name = "cobra", 241 }, 242 .description = DRIVER_DESC, 243 .connect = cobra_connect, 244 .disconnect = cobra_disconnect, 245 }; 246 247 module_gameport_driver(cobra_drv); 248