1 /* 2 * Copyright (c) 2000-2001 Vojtech Pavlik 3 * Copyright (c) 2000 Mark Fletcher 4 */ 5 6 /* 7 * Gravis Stinger gamepad driver for Linux 8 */ 9 10 /* 11 * This program is free warftware; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 24 * 25 * Should you need to contact me, the author, you can do so either by 26 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: 27 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic 28 */ 29 30 #include <linux/kernel.h> 31 #include <linux/module.h> 32 #include <linux/slab.h> 33 #include <linux/input.h> 34 #include <linux/serio.h> 35 #include <linux/init.h> 36 37 #define DRIVER_DESC "Gravis Stinger gamepad driver" 38 39 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 40 MODULE_DESCRIPTION(DRIVER_DESC); 41 MODULE_LICENSE("GPL"); 42 43 /* 44 * Constants. 45 */ 46 47 #define STINGER_MAX_LENGTH 8 48 49 /* 50 * Per-Stinger data. 51 */ 52 53 struct stinger { 54 struct input_dev *dev; 55 int idx; 56 unsigned char data[STINGER_MAX_LENGTH]; 57 char phys[32]; 58 }; 59 60 /* 61 * stinger_process_packet() decodes packets the driver receives from the 62 * Stinger. It updates the data accordingly. 63 */ 64 65 static void stinger_process_packet(struct stinger *stinger) 66 { 67 struct input_dev *dev = stinger->dev; 68 unsigned char *data = stinger->data; 69 70 if (!stinger->idx) return; 71 72 input_report_key(dev, BTN_A, ((data[0] & 0x20) >> 5)); 73 input_report_key(dev, BTN_B, ((data[0] & 0x10) >> 4)); 74 input_report_key(dev, BTN_C, ((data[0] & 0x08) >> 3)); 75 input_report_key(dev, BTN_X, ((data[0] & 0x04) >> 2)); 76 input_report_key(dev, BTN_Y, ((data[3] & 0x20) >> 5)); 77 input_report_key(dev, BTN_Z, ((data[3] & 0x10) >> 4)); 78 input_report_key(dev, BTN_TL, ((data[3] & 0x08) >> 3)); 79 input_report_key(dev, BTN_TR, ((data[3] & 0x04) >> 2)); 80 input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1)); 81 input_report_key(dev, BTN_START, (data[3] & 0x01)); 82 83 input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6)); 84 input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F)); 85 86 input_sync(dev); 87 88 return; 89 } 90 91 /* 92 * stinger_interrupt() is called by the low level driver when characters 93 * are ready for us. We then buffer them for further processing, or call the 94 * packet processing routine. 95 */ 96 97 static irqreturn_t stinger_interrupt(struct serio *serio, 98 unsigned char data, unsigned int flags) 99 { 100 struct stinger *stinger = serio_get_drvdata(serio); 101 102 /* All Stinger packets are 4 bytes */ 103 104 if (stinger->idx < STINGER_MAX_LENGTH) 105 stinger->data[stinger->idx++] = data; 106 107 if (stinger->idx == 4) { 108 stinger_process_packet(stinger); 109 stinger->idx = 0; 110 } 111 112 return IRQ_HANDLED; 113 } 114 115 /* 116 * stinger_disconnect() is the opposite of stinger_connect() 117 */ 118 119 static void stinger_disconnect(struct serio *serio) 120 { 121 struct stinger *stinger = serio_get_drvdata(serio); 122 123 serio_close(serio); 124 serio_set_drvdata(serio, NULL); 125 input_unregister_device(stinger->dev); 126 kfree(stinger); 127 } 128 129 /* 130 * stinger_connect() is the routine that is called when someone adds a 131 * new serio device that supports Stinger protocol and registers it as 132 * an input device. 133 */ 134 135 static int stinger_connect(struct serio *serio, struct serio_driver *drv) 136 { 137 struct stinger *stinger; 138 struct input_dev *input_dev; 139 int err = -ENOMEM; 140 141 stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL); 142 input_dev = input_allocate_device(); 143 if (!stinger || !input_dev) 144 goto fail1; 145 146 stinger->dev = input_dev; 147 snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys); 148 149 input_dev->name = "Gravis Stinger"; 150 input_dev->phys = stinger->phys; 151 input_dev->id.bustype = BUS_RS232; 152 input_dev->id.vendor = SERIO_STINGER; 153 input_dev->id.product = 0x0001; 154 input_dev->id.version = 0x0100; 155 input_dev->dev.parent = &serio->dev; 156 157 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 158 input_dev->keybit[BIT_WORD(BTN_A)] = BIT_MASK(BTN_A) | BIT_MASK(BTN_B) | 159 BIT_MASK(BTN_C) | BIT_MASK(BTN_X) | BIT_MASK(BTN_Y) | 160 BIT_MASK(BTN_Z) | BIT_MASK(BTN_TL) | BIT_MASK(BTN_TR) | 161 BIT_MASK(BTN_START) | BIT_MASK(BTN_SELECT); 162 input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4); 163 input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4); 164 165 serio_set_drvdata(serio, stinger); 166 167 err = serio_open(serio, drv); 168 if (err) 169 goto fail2; 170 171 err = input_register_device(stinger->dev); 172 if (err) 173 goto fail3; 174 175 return 0; 176 177 fail3: serio_close(serio); 178 fail2: serio_set_drvdata(serio, NULL); 179 fail1: 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 return serio_register_driver(&stinger_drv); 218 } 219 220 static void __exit stinger_exit(void) 221 { 222 serio_unregister_driver(&stinger_drv); 223 } 224 225 module_init(stinger_init); 226 module_exit(stinger_exit); 227