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 /* 52 * Per-Stinger data. 53 */ 54 55 struct stinger { 56 struct input_dev *dev; 57 int idx; 58 unsigned char data[STINGER_MAX_LENGTH]; 59 char phys[32]; 60 }; 61 62 /* 63 * stinger_process_packet() decodes packets the driver receives from the 64 * Stinger. It updates the data accordingly. 65 */ 66 67 static void stinger_process_packet(struct stinger *stinger, struct pt_regs *regs) 68 { 69 struct input_dev *dev = stinger->dev; 70 unsigned char *data = stinger->data; 71 72 if (!stinger->idx) return; 73 74 input_regs(dev, regs); 75 76 input_report_key(dev, BTN_A, ((data[0] & 0x20) >> 5)); 77 input_report_key(dev, BTN_B, ((data[0] & 0x10) >> 4)); 78 input_report_key(dev, BTN_C, ((data[0] & 0x08) >> 3)); 79 input_report_key(dev, BTN_X, ((data[0] & 0x04) >> 2)); 80 input_report_key(dev, BTN_Y, ((data[3] & 0x20) >> 5)); 81 input_report_key(dev, BTN_Z, ((data[3] & 0x10) >> 4)); 82 input_report_key(dev, BTN_TL, ((data[3] & 0x08) >> 3)); 83 input_report_key(dev, BTN_TR, ((data[3] & 0x04) >> 2)); 84 input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1)); 85 input_report_key(dev, BTN_START, (data[3] & 0x01)); 86 87 input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6)); 88 input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F)); 89 90 input_sync(dev); 91 92 return; 93 } 94 95 /* 96 * stinger_interrupt() is called by the low level driver when characters 97 * are ready for us. We then buffer them for further processing, or call the 98 * packet processing routine. 99 */ 100 101 static irqreturn_t stinger_interrupt(struct serio *serio, 102 unsigned char data, unsigned int flags, struct pt_regs *regs) 103 { 104 struct stinger *stinger = serio_get_drvdata(serio); 105 106 /* All Stinger packets are 4 bytes */ 107 108 if (stinger->idx < STINGER_MAX_LENGTH) 109 stinger->data[stinger->idx++] = data; 110 111 if (stinger->idx == 4) { 112 stinger_process_packet(stinger, regs); 113 stinger->idx = 0; 114 } 115 116 return IRQ_HANDLED; 117 } 118 119 /* 120 * stinger_disconnect() is the opposite of stinger_connect() 121 */ 122 123 static void stinger_disconnect(struct serio *serio) 124 { 125 struct stinger *stinger = serio_get_drvdata(serio); 126 127 serio_close(serio); 128 serio_set_drvdata(serio, NULL); 129 input_unregister_device(stinger->dev); 130 kfree(stinger); 131 } 132 133 /* 134 * stinger_connect() is the routine that is called when someone adds a 135 * new serio device that supports Stinger protocol and registers it as 136 * an input device. 137 */ 138 139 static int stinger_connect(struct serio *serio, struct serio_driver *drv) 140 { 141 struct stinger *stinger; 142 struct input_dev *input_dev; 143 int err = -ENOMEM; 144 145 stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL); 146 input_dev = input_allocate_device(); 147 if (!stinger || !input_dev) 148 goto fail; 149 150 stinger->dev = input_dev; 151 sprintf(stinger->phys, "%s/serio0", serio->phys); 152 153 input_dev->name = "Gravis Stinger"; 154 input_dev->phys = stinger->phys; 155 input_dev->id.bustype = BUS_RS232; 156 input_dev->id.vendor = SERIO_STINGER; 157 input_dev->id.product = 0x0001; 158 input_dev->id.version = 0x0100; 159 input_dev->cdev.dev = &serio->dev; 160 input_dev->private = stinger; 161 162 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); 163 input_dev->keybit[LONG(BTN_A)] = BIT(BTN_A) | BIT(BTN_B) | BIT(BTN_C) | BIT(BTN_X) | 164 BIT(BTN_Y) | BIT(BTN_Z) | BIT(BTN_TL) | BIT(BTN_TR) | 165 BIT(BTN_START) | BIT(BTN_SELECT); 166 input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4); 167 input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4); 168 169 serio_set_drvdata(serio, stinger); 170 171 err = serio_open(serio, drv); 172 if (err) 173 goto fail; 174 175 input_register_device(stinger->dev); 176 return 0; 177 178 fail: serio_set_drvdata(serio, NULL); 179 input_free_device(input_dev); 180 kfree(stinger); 181 return err; 182 } 183 184 /* 185 * The serio driver structure. 186 */ 187 188 static struct serio_device_id stinger_serio_ids[] = { 189 { 190 .type = SERIO_RS232, 191 .proto = SERIO_STINGER, 192 .id = SERIO_ANY, 193 .extra = SERIO_ANY, 194 }, 195 { 0 } 196 }; 197 198 MODULE_DEVICE_TABLE(serio, stinger_serio_ids); 199 200 static struct serio_driver stinger_drv = { 201 .driver = { 202 .name = "stinger", 203 }, 204 .description = DRIVER_DESC, 205 .id_table = stinger_serio_ids, 206 .interrupt = stinger_interrupt, 207 .connect = stinger_connect, 208 .disconnect = stinger_disconnect, 209 }; 210 211 /* 212 * The functions for inserting/removing us as a module. 213 */ 214 215 static int __init stinger_init(void) 216 { 217 serio_register_driver(&stinger_drv); 218 return 0; 219 } 220 221 static void __exit stinger_exit(void) 222 { 223 serio_unregister_driver(&stinger_drv); 224 } 225 226 module_init(stinger_init); 227 module_exit(stinger_exit); 228