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[/] [test_project/] [trunk/] [linux_sd_driver/] [drivers/] [input/] [joystick/] [magellan.c] - Blame information for rev 62

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1 62 marcus.erl
/*
2
 * $Id: magellan.c,v 1.16 2002/01/22 20:28:39 vojtech Exp $
3
 *
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 *  Copyright (c) 1999-2001 Vojtech Pavlik
5
 */
6
 
7
/*
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 * Magellan and Space Mouse 6dof controller driver for Linux
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 */
10
 
11
/*
12
 * This program is free software; you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 2 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program; if not, write to the Free Software
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 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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 *
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 *  Should you need to contact me, the author, you can do so either by
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 * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
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 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
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 */
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/input.h>
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#include <linux/serio.h>
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#include <linux/init.h>
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#define DRIVER_DESC     "Magellan and SpaceMouse 6dof controller driver"
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MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
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MODULE_DESCRIPTION(DRIVER_DESC);
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MODULE_LICENSE("GPL");
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/*
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 * Definitions & global arrays.
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 */
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#define MAGELLAN_MAX_LENGTH     32
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static int magellan_buttons[] = { BTN_0, BTN_1, BTN_2, BTN_3, BTN_4, BTN_5, BTN_6, BTN_7, BTN_8 };
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static int magellan_axes[] = { ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ };
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53
/*
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 * Per-Magellan data.
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 */
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struct magellan {
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        struct input_dev *dev;
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        int idx;
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        unsigned char data[MAGELLAN_MAX_LENGTH];
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        char phys[32];
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};
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/*
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 * magellan_crunch_nibbles() verifies that the bytes sent from the Magellan
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 * have correct upper nibbles for the lower ones, if not, the packet will
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 * be thrown away. It also strips these upper halves to simplify further
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 * processing.
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 */
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static int magellan_crunch_nibbles(unsigned char *data, int count)
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{
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        static unsigned char nibbles[16] = "0AB3D56GH9:K<MN?";
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        do {
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                if (data[count] == nibbles[data[count] & 0xf])
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                        data[count] = data[count] & 0xf;
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                else
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                        return -1;
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        } while (--count);
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        return 0;
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}
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static void magellan_process_packet(struct magellan* magellan)
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{
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        struct input_dev *dev = magellan->dev;
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        unsigned char *data = magellan->data;
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        int i, t;
90
 
91
        if (!magellan->idx) return;
92
 
93
        switch (magellan->data[0]) {
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                case 'd':                               /* Axis data */
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                        if (magellan->idx != 25) return;
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                        if (magellan_crunch_nibbles(data, 24)) return;
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                        for (i = 0; i < 6; i++)
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                                input_report_abs(dev, magellan_axes[i],
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                                        (data[(i << 2) + 1] << 12 | data[(i << 2) + 2] << 8 |
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                                         data[(i << 2) + 3] <<  4 | data[(i << 2) + 4]) - 32768);
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                        break;
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                case 'k':                               /* Button data */
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                        if (magellan->idx != 4) return;
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                        if (magellan_crunch_nibbles(data, 3)) return;
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                        t = (data[1] << 1) | (data[2] << 5) | data[3];
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                        for (i = 0; i < 9; i++) input_report_key(dev, magellan_buttons[i], (t >> i) & 1);
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                        break;
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        }
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        input_sync(dev);
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}
114
 
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static irqreturn_t magellan_interrupt(struct serio *serio,
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                unsigned char data, unsigned int flags)
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{
118
        struct magellan* magellan = serio_get_drvdata(serio);
119
 
120
        if (data == '\r') {
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                magellan_process_packet(magellan);
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                magellan->idx = 0;
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        } else {
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                if (magellan->idx < MAGELLAN_MAX_LENGTH)
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                        magellan->data[magellan->idx++] = data;
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        }
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        return IRQ_HANDLED;
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}
129
 
130
/*
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 * magellan_disconnect() is the opposite of magellan_connect()
132
 */
133
 
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static void magellan_disconnect(struct serio *serio)
135
{
136
        struct magellan* magellan = serio_get_drvdata(serio);
137
 
138
        serio_close(serio);
139
        serio_set_drvdata(serio, NULL);
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        input_unregister_device(magellan->dev);
141
        kfree(magellan);
142
}
143
 
144
/*
145
 * magellan_connect() is the routine that is called when someone adds a
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 * new serio device that supports Magellan protocol and registers it as
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 * an input device.
148
 */
149
 
150
static int magellan_connect(struct serio *serio, struct serio_driver *drv)
151
{
152
        struct magellan *magellan;
153
        struct input_dev *input_dev;
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        int err = -ENOMEM;
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        int i;
156
 
157
        magellan = kzalloc(sizeof(struct magellan), GFP_KERNEL);
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        input_dev = input_allocate_device();
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        if (!magellan || !input_dev)
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                goto fail1;
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162
        magellan->dev = input_dev;
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        snprintf(magellan->phys, sizeof(magellan->phys), "%s/input0", serio->phys);
164
 
165
        input_dev->name = "LogiCad3D Magellan / SpaceMouse";
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        input_dev->phys = magellan->phys;
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        input_dev->id.bustype = BUS_RS232;
168
        input_dev->id.vendor = SERIO_MAGELLAN;
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        input_dev->id.product = 0x0001;
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        input_dev->id.version = 0x0100;
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        input_dev->dev.parent = &serio->dev;
172
 
173
        input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
174
 
175
        for (i = 0; i < 9; i++)
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                set_bit(magellan_buttons[i], input_dev->keybit);
177
 
178
        for (i = 0; i < 6; i++)
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                input_set_abs_params(input_dev, magellan_axes[i], -360, 360, 0, 0);
180
 
181
        serio_set_drvdata(serio, magellan);
182
 
183
        err = serio_open(serio, drv);
184
        if (err)
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                goto fail2;
186
 
187
        err = input_register_device(magellan->dev);
188
        if (err)
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                goto fail3;
190
 
191
        return 0;
192
 
193
 fail3: serio_close(serio);
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 fail2: serio_set_drvdata(serio, NULL);
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 fail1: input_free_device(input_dev);
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        kfree(magellan);
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        return err;
198
}
199
 
200
/*
201
 * The serio driver structure.
202
 */
203
 
204
static struct serio_device_id magellan_serio_ids[] = {
205
        {
206
                .type   = SERIO_RS232,
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                .proto  = SERIO_MAGELLAN,
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                .id     = SERIO_ANY,
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                .extra  = SERIO_ANY,
210
        },
211
        { 0 }
212
};
213
 
214
MODULE_DEVICE_TABLE(serio, magellan_serio_ids);
215
 
216
static struct serio_driver magellan_drv = {
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        .driver         = {
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                .name   = "magellan",
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        },
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        .description    = DRIVER_DESC,
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        .id_table       = magellan_serio_ids,
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        .interrupt      = magellan_interrupt,
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        .connect        = magellan_connect,
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        .disconnect     = magellan_disconnect,
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};
226
 
227
/*
228
 * The functions for inserting/removing us as a module.
229
 */
230
 
231
static int __init magellan_init(void)
232
{
233
        return serio_register_driver(&magellan_drv);
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);

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