1 /* 2 * $Id: stinger.c,v 1.10 2002/01/22 20:29:31 vojtech Exp $ 3 * 4 * Copyright (c) 2000-2001 Vojtech Pavlik 5 * Copyright (c) 2000 Mark Fletcher 6 */ 7 8 /* 9 * Gravis Stinger gamepad driver for Linux 10 */ 11 12 /* 13 * This program is free warftware; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation; either version 2 of the License, or 16 * (at your option) any later version. 17 * 18 * This program is distributed in the hope that it will be useful, 19 * but WITHOUT ANY WARRANTY; without even the implied warranty of 20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 * GNU General Public License for more details. 22 * 23 * You should have received a copy of the GNU General Public License 24 * along with this program; if not, write to the Free Software 25 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 26 * 27 * Should you need to contact me, the author, you can do so either by 28 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: 29 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic 30 */ 31 32 #include <linux/kernel.h> 33 #include <linux/module.h> 34 #include <linux/slab.h> 35 #include <linux/input.h> 36 #include <linux/serio.h> 37 #include <linux/init.h> 38 39 #define DRIVER_DESC "Gravis Stinger gamepad driver" 40 41 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 42 MODULE_DESCRIPTION(DRIVER_DESC); 43 MODULE_LICENSE("GPL"); 44 45 /* 46 * Constants. 47 */ 48 49 #define STINGER_MAX_LENGTH 8 50 51 static char *stinger_name = "Gravis Stinger"; 52 53 /* 54 * Per-Stinger data. 55 */ 56 57 struct stinger { 58 struct input_dev dev; 59 int idx; 60 unsigned char data[STINGER_MAX_LENGTH]; 61 char phys[32]; 62 }; 63 64 /* 65 * stinger_process_packet() decodes packets the driver receives from the 66 * Stinger. It updates the data accordingly. 67 */ 68 69 static void stinger_process_packet(struct stinger *stinger, struct pt_regs *regs) 70 { 71 struct input_dev *dev = &stinger->dev; 72 unsigned char *data = stinger->data; 73 74 if (!stinger->idx) return; 75 76 input_regs(dev, regs); 77 78 input_report_key(dev, BTN_A, ((data[0] & 0x20) >> 5)); 79 input_report_key(dev, BTN_B, ((data[0] & 0x10) >> 4)); 80 input_report_key(dev, BTN_C, ((data[0] & 0x08) >> 3)); 81 input_report_key(dev, BTN_X, ((data[0] & 0x04) >> 2)); 82 input_report_key(dev, BTN_Y, ((data[3] & 0x20) >> 5)); 83 input_report_key(dev, BTN_Z, ((data[3] & 0x10) >> 4)); 84 input_report_key(dev, BTN_TL, ((data[3] & 0x08) >> 3)); 85 input_report_key(dev, BTN_TR, ((data[3] & 0x04) >> 2)); 86 input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1)); 87 input_report_key(dev, BTN_START, (data[3] & 0x01)); 88 89 input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6)); 90 input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F)); 91 92 input_sync(dev); 93 94 return; 95 } 96 97 /* 98 * stinger_interrupt() is called by the low level driver when characters 99 * are ready for us. We then buffer them for further processing, or call the 100 * packet processing routine. 101 */ 102 103 static irqreturn_t stinger_interrupt(struct serio *serio, 104 unsigned char data, unsigned int flags, struct pt_regs *regs) 105 { 106 struct stinger *stinger = serio_get_drvdata(serio); 107 108 /* All Stinger packets are 4 bytes */ 109 110 if (stinger->idx < STINGER_MAX_LENGTH) 111 stinger->data[stinger->idx++] = data; 112 113 if (stinger->idx == 4) { 114 stinger_process_packet(stinger, regs); 115 stinger->idx = 0; 116 } 117 118 return IRQ_HANDLED; 119 } 120 121 /* 122 * stinger_disconnect() is the opposite of stinger_connect() 123 */ 124 125 static void stinger_disconnect(struct serio *serio) 126 { 127 struct stinger *stinger = serio_get_drvdata(serio); 128 129 input_unregister_device(&stinger->dev); 130 serio_close(serio); 131 serio_set_drvdata(serio, NULL); 132 kfree(stinger); 133 } 134 135 /* 136 * stinger_connect() is the routine that is called when someone adds a 137 * new serio device that supports Stinger protocol and registers it as 138 * an input device. 139 */ 140 141 static int stinger_connect(struct serio *serio, struct serio_driver *drv) 142 { 143 struct stinger *stinger; 144 int i; 145 int err; 146 147 if (!(stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL))) 148 return -ENOMEM; 149 150 memset(stinger, 0, sizeof(struct stinger)); 151 152 stinger->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); 153 stinger->dev.keybit[LONG(BTN_A)] = BIT(BTN_A) | BIT(BTN_B) | BIT(BTN_C) | BIT(BTN_X) | \ 154 BIT(BTN_Y) | BIT(BTN_Z) | BIT(BTN_TL) | BIT(BTN_TR) | \ 155 BIT(BTN_START) | BIT(BTN_SELECT); 156 stinger->dev.absbit[0] = BIT(ABS_X) | BIT(ABS_Y); 157 158 sprintf(stinger->phys, "%s/serio0", serio->phys); 159 160 init_input_dev(&stinger->dev); 161 stinger->dev.name = stinger_name; 162 stinger->dev.phys = stinger->phys; 163 stinger->dev.id.bustype = BUS_RS232; 164 stinger->dev.id.vendor = SERIO_STINGER; 165 stinger->dev.id.product = 0x0001; 166 stinger->dev.id.version = 0x0100; 167 stinger->dev.dev = &serio->dev; 168 169 for (i = 0; i < 2; i++) { 170 stinger->dev.absmax[ABS_X+i] = 64; 171 stinger->dev.absmin[ABS_X+i] = -64; 172 stinger->dev.absflat[ABS_X+i] = 4; 173 } 174 175 stinger->dev.private = stinger; 176 177 serio_set_drvdata(serio, stinger); 178 179 err = serio_open(serio, drv); 180 if (err) { 181 serio_set_drvdata(serio, NULL); 182 kfree(stinger); 183 return err; 184 } 185 186 input_register_device(&stinger->dev); 187 188 printk(KERN_INFO "input: %s on %s\n", stinger_name, serio->phys); 189 190 return 0; 191 } 192 193 /* 194 * The serio driver structure. 195 */ 196 197 static struct serio_device_id stinger_serio_ids[] = { 198 { 199 .type = SERIO_RS232, 200 .proto = SERIO_STINGER, 201 .id = SERIO_ANY, 202 .extra = SERIO_ANY, 203 }, 204 { 0 } 205 }; 206 207 MODULE_DEVICE_TABLE(serio, stinger_serio_ids); 208 209 static struct serio_driver stinger_drv = { 210 .driver = { 211 .name = "stinger", 212 }, 213 .description = DRIVER_DESC, 214 .id_table = stinger_serio_ids, 215 .interrupt = stinger_interrupt, 216 .connect = stinger_connect, 217 .disconnect = stinger_disconnect, 218 }; 219 220 /* 221 * The functions for inserting/removing us as a module. 222 */ 223 224 static int __init stinger_init(void) 225 { 226 serio_register_driver(&stinger_drv); 227 return 0; 228 } 229 230 static void __exit stinger_exit(void) 231 { 232 serio_unregister_driver(&stinger_drv); 233 } 234 235 module_init(stinger_init); 236 module_exit(stinger_exit); 237