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 36 #define DRIVER_DESC "Gravis Stinger gamepad driver" 37 38 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 39 MODULE_DESCRIPTION(DRIVER_DESC); 40 MODULE_LICENSE("GPL"); 41 42 /* 43 * Constants. 44 */ 45 46 #define STINGER_MAX_LENGTH 8 47 48 /* 49 * Per-Stinger data. 50 */ 51 52 struct stinger { 53 struct input_dev *dev; 54 int idx; 55 unsigned char data[STINGER_MAX_LENGTH]; 56 char phys[32]; 57 }; 58 59 /* 60 * stinger_process_packet() decodes packets the driver receives from the 61 * Stinger. It updates the data accordingly. 62 */ 63 64 static void stinger_process_packet(struct stinger *stinger) 65 { 66 struct input_dev *dev = stinger->dev; 67 unsigned char *data = stinger->data; 68 69 if (!stinger->idx) return; 70 71 input_report_key(dev, BTN_A, ((data[0] & 0x20) >> 5)); 72 input_report_key(dev, BTN_B, ((data[0] & 0x10) >> 4)); 73 input_report_key(dev, BTN_C, ((data[0] & 0x08) >> 3)); 74 input_report_key(dev, BTN_X, ((data[0] & 0x04) >> 2)); 75 input_report_key(dev, BTN_Y, ((data[3] & 0x20) >> 5)); 76 input_report_key(dev, BTN_Z, ((data[3] & 0x10) >> 4)); 77 input_report_key(dev, BTN_TL, ((data[3] & 0x08) >> 3)); 78 input_report_key(dev, BTN_TR, ((data[3] & 0x04) >> 2)); 79 input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1)); 80 input_report_key(dev, BTN_START, (data[3] & 0x01)); 81 82 input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6)); 83 input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F)); 84 85 input_sync(dev); 86 87 return; 88 } 89 90 /* 91 * stinger_interrupt() is called by the low level driver when characters 92 * are ready for us. We then buffer them for further processing, or call the 93 * packet processing routine. 94 */ 95 96 static irqreturn_t stinger_interrupt(struct serio *serio, 97 unsigned char data, unsigned int flags) 98 { 99 struct stinger *stinger = serio_get_drvdata(serio); 100 101 /* All Stinger packets are 4 bytes */ 102 103 if (stinger->idx < STINGER_MAX_LENGTH) 104 stinger->data[stinger->idx++] = data; 105 106 if (stinger->idx == 4) { 107 stinger_process_packet(stinger); 108 stinger->idx = 0; 109 } 110 111 return IRQ_HANDLED; 112 } 113 114 /* 115 * stinger_disconnect() is the opposite of stinger_connect() 116 */ 117 118 static void stinger_disconnect(struct serio *serio) 119 { 120 struct stinger *stinger = serio_get_drvdata(serio); 121 122 serio_close(serio); 123 serio_set_drvdata(serio, NULL); 124 input_unregister_device(stinger->dev); 125 kfree(stinger); 126 } 127 128 /* 129 * stinger_connect() is the routine that is called when someone adds a 130 * new serio device that supports Stinger protocol and registers it as 131 * an input device. 132 */ 133 134 static int stinger_connect(struct serio *serio, struct serio_driver *drv) 135 { 136 struct stinger *stinger; 137 struct input_dev *input_dev; 138 int err = -ENOMEM; 139 140 stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL); 141 input_dev = input_allocate_device(); 142 if (!stinger || !input_dev) 143 goto fail1; 144 145 stinger->dev = input_dev; 146 snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys); 147 148 input_dev->name = "Gravis Stinger"; 149 input_dev->phys = stinger->phys; 150 input_dev->id.bustype = BUS_RS232; 151 input_dev->id.vendor = SERIO_STINGER; 152 input_dev->id.product = 0x0001; 153 input_dev->id.version = 0x0100; 154 input_dev->dev.parent = &serio->dev; 155 156 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 157 input_dev->keybit[BIT_WORD(BTN_A)] = BIT_MASK(BTN_A) | BIT_MASK(BTN_B) | 158 BIT_MASK(BTN_C) | BIT_MASK(BTN_X) | BIT_MASK(BTN_Y) | 159 BIT_MASK(BTN_Z) | BIT_MASK(BTN_TL) | BIT_MASK(BTN_TR) | 160 BIT_MASK(BTN_START) | BIT_MASK(BTN_SELECT); 161 input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4); 162 input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4); 163 164 serio_set_drvdata(serio, stinger); 165 166 err = serio_open(serio, drv); 167 if (err) 168 goto fail2; 169 170 err = input_register_device(stinger->dev); 171 if (err) 172 goto fail3; 173 174 return 0; 175 176 fail3: serio_close(serio); 177 fail2: serio_set_drvdata(serio, NULL); 178 fail1: input_free_device(input_dev); 179 kfree(stinger); 180 return err; 181 } 182 183 /* 184 * The serio driver structure. 185 */ 186 187 static const struct serio_device_id stinger_serio_ids[] = { 188 { 189 .type = SERIO_RS232, 190 .proto = SERIO_STINGER, 191 .id = SERIO_ANY, 192 .extra = SERIO_ANY, 193 }, 194 { 0 } 195 }; 196 197 MODULE_DEVICE_TABLE(serio, stinger_serio_ids); 198 199 static struct serio_driver stinger_drv = { 200 .driver = { 201 .name = "stinger", 202 }, 203 .description = DRIVER_DESC, 204 .id_table = stinger_serio_ids, 205 .interrupt = stinger_interrupt, 206 .connect = stinger_connect, 207 .disconnect = stinger_disconnect, 208 }; 209 210 module_serio_driver(stinger_drv); 211