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Linux/drivers/input/joystick/magellan.c

  1 /*
  2  *  Copyright (c) 1999-2001 Vojtech Pavlik
  3  */
  4 
  5 /*
  6  * Magellan and Space Mouse 6dof controller driver for Linux
  7  */
  8 
  9 /*
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License as published by
 12  * the Free Software Foundation; either version 2 of the License, or
 13  * (at your option) any later version.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18  * GNU General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public License
 21  * along with this program; if not, write to the Free Software
 22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 23  *
 24  *  Should you need to contact me, the author, you can do so either by
 25  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
 26  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 27  */
 28 
 29 #include <linux/kernel.h>
 30 #include <linux/module.h>
 31 #include <linux/slab.h>
 32 #include <linux/input.h>
 33 #include <linux/serio.h>
 34 
 35 #define DRIVER_DESC     "Magellan and SpaceMouse 6dof controller driver"
 36 
 37 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
 38 MODULE_DESCRIPTION(DRIVER_DESC);
 39 MODULE_LICENSE("GPL");
 40 
 41 /*
 42  * Definitions & global arrays.
 43  */
 44 
 45 #define MAGELLAN_MAX_LENGTH     32
 46 
 47 static int magellan_buttons[] = { BTN_0, BTN_1, BTN_2, BTN_3, BTN_4, BTN_5, BTN_6, BTN_7, BTN_8 };
 48 static int magellan_axes[] = { ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ };
 49 
 50 /*
 51  * Per-Magellan data.
 52  */
 53 
 54 struct magellan {
 55         struct input_dev *dev;
 56         int idx;
 57         unsigned char data[MAGELLAN_MAX_LENGTH];
 58         char phys[32];
 59 };
 60 
 61 /*
 62  * magellan_crunch_nibbles() verifies that the bytes sent from the Magellan
 63  * have correct upper nibbles for the lower ones, if not, the packet will
 64  * be thrown away. It also strips these upper halves to simplify further
 65  * processing.
 66  */
 67 
 68 static int magellan_crunch_nibbles(unsigned char *data, int count)
 69 {
 70         static unsigned char nibbles[16] = "0AB3D56GH9:K<MN?";
 71 
 72         do {
 73                 if (data[count] == nibbles[data[count] & 0xf])
 74                         data[count] = data[count] & 0xf;
 75                 else
 76                         return -1;
 77         } while (--count);
 78 
 79         return 0;
 80 }
 81 
 82 static void magellan_process_packet(struct magellan* magellan)
 83 {
 84         struct input_dev *dev = magellan->dev;
 85         unsigned char *data = magellan->data;
 86         int i, t;
 87 
 88         if (!magellan->idx) return;
 89 
 90         switch (magellan->data[0]) {
 91 
 92                 case 'd':                               /* Axis data */
 93                         if (magellan->idx != 25) return;
 94                         if (magellan_crunch_nibbles(data, 24)) return;
 95                         for (i = 0; i < 6; i++)
 96                                 input_report_abs(dev, magellan_axes[i],
 97                                         (data[(i << 2) + 1] << 12 | data[(i << 2) + 2] << 8 |
 98                                          data[(i << 2) + 3] <<  4 | data[(i << 2) + 4]) - 32768);
 99                         break;
100 
101                 case 'k':                               /* Button data */
102                         if (magellan->idx != 4) return;
103                         if (magellan_crunch_nibbles(data, 3)) return;
104                         t = (data[1] << 1) | (data[2] << 5) | data[3];
105                         for (i = 0; i < 9; i++) input_report_key(dev, magellan_buttons[i], (t >> i) & 1);
106                         break;
107         }
108 
109         input_sync(dev);
110 }
111 
112 static irqreturn_t magellan_interrupt(struct serio *serio,
113                 unsigned char data, unsigned int flags)
114 {
115         struct magellan* magellan = serio_get_drvdata(serio);
116 
117         if (data == '\r') {
118                 magellan_process_packet(magellan);
119                 magellan->idx = 0;
120         } else {
121                 if (magellan->idx < MAGELLAN_MAX_LENGTH)
122                         magellan->data[magellan->idx++] = data;
123         }
124         return IRQ_HANDLED;
125 }
126 
127 /*
128  * magellan_disconnect() is the opposite of magellan_connect()
129  */
130 
131 static void magellan_disconnect(struct serio *serio)
132 {
133         struct magellan* magellan = serio_get_drvdata(serio);
134 
135         serio_close(serio);
136         serio_set_drvdata(serio, NULL);
137         input_unregister_device(magellan->dev);
138         kfree(magellan);
139 }
140 
141 /*
142  * magellan_connect() is the routine that is called when someone adds a
143  * new serio device that supports Magellan protocol and registers it as
144  * an input device.
145  */
146 
147 static int magellan_connect(struct serio *serio, struct serio_driver *drv)
148 {
149         struct magellan *magellan;
150         struct input_dev *input_dev;
151         int err = -ENOMEM;
152         int i;
153 
154         magellan = kzalloc(sizeof(struct magellan), GFP_KERNEL);
155         input_dev = input_allocate_device();
156         if (!magellan || !input_dev)
157                 goto fail1;
158 
159         magellan->dev = input_dev;
160         snprintf(magellan->phys, sizeof(magellan->phys), "%s/input0", serio->phys);
161 
162         input_dev->name = "LogiCad3D Magellan / SpaceMouse";
163         input_dev->phys = magellan->phys;
164         input_dev->id.bustype = BUS_RS232;
165         input_dev->id.vendor = SERIO_MAGELLAN;
166         input_dev->id.product = 0x0001;
167         input_dev->id.version = 0x0100;
168         input_dev->dev.parent = &serio->dev;
169 
170         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
171 
172         for (i = 0; i < 9; i++)
173                 set_bit(magellan_buttons[i], input_dev->keybit);
174 
175         for (i = 0; i < 6; i++)
176                 input_set_abs_params(input_dev, magellan_axes[i], -360, 360, 0, 0);
177 
178         serio_set_drvdata(serio, magellan);
179 
180         err = serio_open(serio, drv);
181         if (err)
182                 goto fail2;
183 
184         err = input_register_device(magellan->dev);
185         if (err)
186                 goto fail3;
187 
188         return 0;
189 
190  fail3: serio_close(serio);
191  fail2: serio_set_drvdata(serio, NULL);
192  fail1: input_free_device(input_dev);
193         kfree(magellan);
194         return err;
195 }
196 
197 /*
198  * The serio driver structure.
199  */
200 
201 static struct serio_device_id magellan_serio_ids[] = {
202         {
203                 .type   = SERIO_RS232,
204                 .proto  = SERIO_MAGELLAN,
205                 .id     = SERIO_ANY,
206                 .extra  = SERIO_ANY,
207         },
208         { 0 }
209 };
210 
211 MODULE_DEVICE_TABLE(serio, magellan_serio_ids);
212 
213 static struct serio_driver magellan_drv = {
214         .driver         = {
215                 .name   = "magellan",
216         },
217         .description    = DRIVER_DESC,
218         .id_table       = magellan_serio_ids,
219         .interrupt      = magellan_interrupt,
220         .connect        = magellan_connect,
221         .disconnect     = magellan_disconnect,
222 };
223 
224 module_serio_driver(magellan_drv);
225 

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