1 /* 2 * $Id: magellan.c,v 1.16 2002/01/22 20:28:39 vojtech Exp $ 3 * 4 * Copyright (c) 1999-2001 Vojtech Pavlik 5 */ 6 7 /* 8 * Magellan and Space Mouse 6dof controller driver for Linux 9 */ 10 11 /* 12 * This program is free software; you can redistribute it and/or modify 13 * it under the terms of the GNU General Public License as published by 14 * the Free Software Foundation; either version 2 of the License, or 15 * (at your option) any later version. 16 * 17 * This program is distributed in the hope that it will be useful, 18 * but WITHOUT ANY WARRANTY; without even the implied warranty of 19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 * GNU General Public License for more details. 21 * 22 * You should have received a copy of the GNU General Public License 23 * along with this program; if not, write to the Free Software 24 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 25 * 26 * Should you need to contact me, the author, you can do so either by 27 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail: 28 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic 29 */ 30 31 #include <linux/kernel.h> 32 #include <linux/module.h> 33 #include <linux/slab.h> 34 #include <linux/input.h> 35 #include <linux/serio.h> 36 #include <linux/init.h> 37 38 #define DRIVER_DESC "Magellan and SpaceMouse 6dof controller driver" 39 40 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); 41 MODULE_DESCRIPTION(DRIVER_DESC); 42 MODULE_LICENSE("GPL"); 43 44 /* 45 * Definitions & global arrays. 46 */ 47 48 #define MAGELLAN_MAX_LENGTH 32 49 50 static int magellan_buttons[] = { BTN_0, BTN_1, BTN_2, BTN_3, BTN_4, BTN_5, BTN_6, BTN_7, BTN_8 }; 51 static int magellan_axes[] = { ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ }; 52 53 /* 54 * Per-Magellan data. 55 */ 56 57 struct magellan { 58 struct input_dev *dev; 59 int idx; 60 unsigned char data[MAGELLAN_MAX_LENGTH]; 61 char phys[32]; 62 }; 63 64 /* 65 * magellan_crunch_nibbles() verifies that the bytes sent from the Magellan 66 * have correct upper nibbles for the lower ones, if not, the packet will 67 * be thrown away. It also strips these upper halves to simplify further 68 * processing. 69 */ 70 71 static int magellan_crunch_nibbles(unsigned char *data, int count) 72 { 73 static unsigned char nibbles[16] = "0AB3D56GH9:K<MN?"; 74 75 do { 76 if (data[count] == nibbles[data[count] & 0xf]) 77 data[count] = data[count] & 0xf; 78 else 79 return -1; 80 } while (--count); 81 82 return 0; 83 } 84 85 static void magellan_process_packet(struct magellan* magellan, struct pt_regs *regs) 86 { 87 struct input_dev *dev = magellan->dev; 88 unsigned char *data = magellan->data; 89 int i, t; 90 91 if (!magellan->idx) return; 92 93 input_regs(dev, regs); 94 95 switch (magellan->data[0]) { 96 97 case 'd': /* Axis data */ 98 if (magellan->idx != 25) return; 99 if (magellan_crunch_nibbles(data, 24)) return; 100 for (i = 0; i < 6; i++) 101 input_report_abs(dev, magellan_axes[i], 102 (data[(i << 2) + 1] << 12 | data[(i << 2) + 2] << 8 | 103 data[(i << 2) + 3] << 4 | data[(i << 2) + 4]) - 32768); 104 break; 105 106 case 'k': /* Button data */ 107 if (magellan->idx != 4) return; 108 if (magellan_crunch_nibbles(data, 3)) return; 109 t = (data[1] << 1) | (data[2] << 5) | data[3]; 110 for (i = 0; i < 9; i++) input_report_key(dev, magellan_buttons[i], (t >> i) & 1); 111 break; 112 } 113 114 input_sync(dev); 115 } 116 117 static irqreturn_t magellan_interrupt(struct serio *serio, 118 unsigned char data, unsigned int flags, struct pt_regs *regs) 119 { 120 struct magellan* magellan = serio_get_drvdata(serio); 121 122 if (data == '\r') { 123 magellan_process_packet(magellan, regs); 124 magellan->idx = 0; 125 } else { 126 if (magellan->idx < MAGELLAN_MAX_LENGTH) 127 magellan->data[magellan->idx++] = data; 128 } 129 return IRQ_HANDLED; 130 } 131 132 /* 133 * magellan_disconnect() is the opposite of magellan_connect() 134 */ 135 136 static void magellan_disconnect(struct serio *serio) 137 { 138 struct magellan* magellan = serio_get_drvdata(serio); 139 140 serio_close(serio); 141 serio_set_drvdata(serio, NULL); 142 input_unregister_device(magellan->dev); 143 kfree(magellan); 144 } 145 146 /* 147 * magellan_connect() is the routine that is called when someone adds a 148 * new serio device that supports Magellan protocol and registers it as 149 * an input device. 150 */ 151 152 static int magellan_connect(struct serio *serio, struct serio_driver *drv) 153 { 154 struct magellan *magellan; 155 struct input_dev *input_dev; 156 int err = -ENOMEM; 157 int i; 158 159 magellan = kzalloc(sizeof(struct magellan), GFP_KERNEL); 160 input_dev = input_allocate_device(); 161 if (!magellan || !input_dev) 162 goto fail; 163 164 magellan->dev = input_dev; 165 snprintf(magellan->phys, sizeof(magellan->phys), "%s/input0", serio->phys); 166 167 input_dev->name = "LogiCad3D Magellan / SpaceMouse"; 168 input_dev->phys = magellan->phys; 169 input_dev->id.bustype = BUS_RS232; 170 input_dev->id.vendor = SERIO_MAGELLAN; 171 input_dev->id.product = 0x0001; 172 input_dev->id.version = 0x0100; 173 input_dev->cdev.dev = &serio->dev; 174 input_dev->private = magellan; 175 176 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); 177 178 for (i = 0; i < 9; i++) 179 set_bit(magellan_buttons[i], input_dev->keybit); 180 181 for (i = 0; i < 6; i++) 182 input_set_abs_params(input_dev, magellan_axes[i], -360, 360, 0, 0); 183 184 serio_set_drvdata(serio, magellan); 185 186 err = serio_open(serio, drv); 187 if (err) 188 goto fail; 189 190 input_register_device(magellan->dev); 191 return 0; 192 193 fail: serio_set_drvdata(serio, NULL); 194 input_free_device(input_dev); 195 kfree(magellan); 196 return err; 197 } 198 199 /* 200 * The serio driver structure. 201 */ 202 203 static struct serio_device_id magellan_serio_ids[] = { 204 { 205 .type = SERIO_RS232, 206 .proto = SERIO_MAGELLAN, 207 .id = SERIO_ANY, 208 .extra = SERIO_ANY, 209 }, 210 { 0 } 211 }; 212 213 MODULE_DEVICE_TABLE(serio, magellan_serio_ids); 214 215 static struct serio_driver magellan_drv = { 216 .driver = { 217 .name = "magellan", 218 }, 219 .description = DRIVER_DESC, 220 .id_table = magellan_serio_ids, 221 .interrupt = magellan_interrupt, 222 .connect = magellan_connect, 223 .disconnect = magellan_disconnect, 224 }; 225 226 /* 227 * The functions for inserting/removing us as a module. 228 */ 229 230 static int __init magellan_init(void) 231 { 232 serio_register_driver(&magellan_drv); 233 return 0; 234 } 235 236 static void __exit magellan_exit(void) 237 { 238 serio_unregister_driver(&magellan_drv); 239 } 240 241 module_init(magellan_init); 242 module_exit(magellan_exit); 243