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 26 #include <linux/kernel.h> 27 #include <linux/module.h> 28 #include <linux/slab.h> 29 #include <linux/input.h> 30 #include <linux/serio.h> 31 32 #define DRIVER_DESC "Gravis Stinger gamepad driver" 33 34 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 35 MODULE_DESCRIPTION(DRIVER_DESC); 36 MODULE_LICENSE("GPL"); 37 38 /* 39 * Constants. 40 */ 41 42 #define STINGER_MAX_LENGTH 8 43 44 /* 45 * Per-Stinger data. 46 */ 47 48 struct stinger { 49 struct input_dev *dev; 50 int idx; 51 unsigned char data[STINGER_MAX_LENGTH]; 52 char phys[32]; 53 }; 54 55 /* 56 * stinger_process_packet() decodes packets the driver receives from the 57 * Stinger. It updates the data accordingly. 58 */ 59 60 static void stinger_process_packet(struct stinger *stinger) 61 { 62 struct input_dev *dev = stinger->dev; 63 unsigned char *data = stinger->data; 64 65 if (!stinger->idx) return; 66 67 input_report_key(dev, BTN_A, ((data[0] & 0x20) >> 5)); 68 input_report_key(dev, BTN_B, ((data[0] & 0x10) >> 4)); 69 input_report_key(dev, BTN_C, ((data[0] & 0x08) >> 3)); 70 input_report_key(dev, BTN_X, ((data[0] & 0x04) >> 2)); 71 input_report_key(dev, BTN_Y, ((data[3] & 0x20) >> 5)); 72 input_report_key(dev, BTN_Z, ((data[3] & 0x10) >> 4)); 73 input_report_key(dev, BTN_TL, ((data[3] & 0x08) >> 3)); 74 input_report_key(dev, BTN_TR, ((data[3] & 0x04) >> 2)); 75 input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1)); 76 input_report_key(dev, BTN_START, (data[3] & 0x01)); 77 78 input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6)); 79 input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F)); 80 81 input_sync(dev); 82 83 return; 84 } 85 86 /* 87 * stinger_interrupt() is called by the low level driver when characters 88 * are ready for us. We then buffer them for further processing, or call the 89 * packet processing routine. 90 */ 91 92 static irqreturn_t stinger_interrupt(struct serio *serio, 93 unsigned char data, unsigned int flags) 94 { 95 struct stinger *stinger = serio_get_drvdata(serio); 96 97 /* All Stinger packets are 4 bytes */ 98 99 if (stinger->idx < STINGER_MAX_LENGTH) 100 stinger->data[stinger->idx++] = data; 101 102 if (stinger->idx == 4) { 103 stinger_process_packet(stinger); 104 stinger->idx = 0; 105 } 106 107 return IRQ_HANDLED; 108 } 109 110 /* 111 * stinger_disconnect() is the opposite of stinger_connect() 112 */ 113 114 static void stinger_disconnect(struct serio *serio) 115 { 116 struct stinger *stinger = serio_get_drvdata(serio); 117 118 serio_close(serio); 119 serio_set_drvdata(serio, NULL); 120 input_unregister_device(stinger->dev); 121 kfree(stinger); 122 } 123 124 /* 125 * stinger_connect() is the routine that is called when someone adds a 126 * new serio device that supports Stinger protocol and registers it as 127 * an input device. 128 */ 129 130 static int stinger_connect(struct serio *serio, struct serio_driver *drv) 131 { 132 struct stinger *stinger; 133 struct input_dev *input_dev; 134 int err = -ENOMEM; 135 136 stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL); 137 input_dev = input_allocate_device(); 138 if (!stinger || !input_dev) 139 goto fail1; 140 141 stinger->dev = input_dev; 142 snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys); 143 144 input_dev->name = "Gravis Stinger"; 145 input_dev->phys = stinger->phys; 146 input_dev->id.bustype = BUS_RS232; 147 input_dev->id.vendor = SERIO_STINGER; 148 input_dev->id.product = 0x0001; 149 input_dev->id.version = 0x0100; 150 input_dev->dev.parent = &serio->dev; 151 152 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); 153 input_dev->keybit[BIT_WORD(BTN_A)] = BIT_MASK(BTN_A) | BIT_MASK(BTN_B) | 154 BIT_MASK(BTN_C) | BIT_MASK(BTN_X) | BIT_MASK(BTN_Y) | 155 BIT_MASK(BTN_Z) | BIT_MASK(BTN_TL) | BIT_MASK(BTN_TR) | 156 BIT_MASK(BTN_START) | BIT_MASK(BTN_SELECT); 157 input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4); 158 input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4); 159 160 serio_set_drvdata(serio, stinger); 161 162 err = serio_open(serio, drv); 163 if (err) 164 goto fail2; 165 166 err = input_register_device(stinger->dev); 167 if (err) 168 goto fail3; 169 170 return 0; 171 172 fail3: serio_close(serio); 173 fail2: serio_set_drvdata(serio, NULL); 174 fail1: input_free_device(input_dev); 175 kfree(stinger); 176 return err; 177 } 178 179 /* 180 * The serio driver structure. 181 */ 182 183 static const struct serio_device_id stinger_serio_ids[] = { 184 { 185 .type = SERIO_RS232, 186 .proto = SERIO_STINGER, 187 .id = SERIO_ANY, 188 .extra = SERIO_ANY, 189 }, 190 { 0 } 191 }; 192 193 MODULE_DEVICE_TABLE(serio, stinger_serio_ids); 194 195 static struct serio_driver stinger_drv = { 196 .driver = { 197 .name = "stinger", 198 }, 199 .description = DRIVER_DESC, 200 .id_table = stinger_serio_ids, 201 .interrupt = stinger_interrupt, 202 .connect = stinger_connect, 203 .disconnect = stinger_disconnect, 204 }; 205 206 module_serio_driver(stinger_drv); 207