diff options
Diffstat (limited to 'drivers/char/joystick/spaceball.c')
| -rw-r--r-- | drivers/char/joystick/spaceball.c | 231 |
1 files changed, 231 insertions, 0 deletions
diff --git a/drivers/char/joystick/spaceball.c b/drivers/char/joystick/spaceball.c new file mode 100644 index 000000000..4f5059330 --- /dev/null +++ b/drivers/char/joystick/spaceball.c @@ -0,0 +1,231 @@ +/* + * $Id: spaceball.c,v 1.6 2000/05/29 11:19:51 vojtech Exp $ + * + * Copyright (c) 1999-2000 Vojtech Pavlik + * + * Based on the work of: + * David Thompson + * Joseph Krahn + * + * Sponsored by SuSE + */ + +/* + * SpaceTec SpaceBall 4000 FLX driver for Linux + */ + +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Should you need to contact me, the author, you can do so either by + * e-mail - mail your message to <vojtech@suse.cz>, or by paper mail: + * Vojtech Pavlik, Ucitelska 1576, Prague 8, 182 00 Czech Republic + */ + +#include <linux/kernel.h> +#include <linux/malloc.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/input.h> +#include <linux/serio.h> + +/* + * Constants. + */ + +#define JS_SBALL_MAX_LENGTH 128 +static int spaceball_axes[] = { ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ }; +static char *spaceball_name = "SpaceTec SpaceBall 4000 FLX"; + +/* + * Per-Ball data. + */ + +struct spaceball { + struct input_dev dev; + struct serio *serio; + int idx; + int escape; + unsigned char data[JS_SBALL_MAX_LENGTH]; +}; + +/* + * spaceball_process_packet() decodes packets the driver receives from the + * SpaceBall. + */ + +static void spaceball_process_packet(struct spaceball* spaceball) +{ + struct input_dev *dev = &spaceball->dev; + unsigned char *data = spaceball->data; + int i, d; + + if (spaceball->idx < 2) return; + + switch (spaceball->data[0]) { + + case '@': /* Reset packet */ + spaceball->data[spaceball->idx - 1] = 0; + for (i = 1; i < spaceball->idx && spaceball->data[i] == ' '; i++); + printk(KERN_INFO "input%d: %s [%s] on serio%d\n", + spaceball->dev.number, spaceball_name, spaceball->data + i, spaceball->serio->number); + break; + + case 'D': /* Ball data */ + if (spaceball->idx != 16) return; + for (i = 0; i < 6; i++) { + d = ((data[2 * i + 3] << 8) | data[2 * i + 2]); + input_report_abs(dev, spaceball_axes[i], d - ((d & 0x8000) ? 0x10000 : 0)); + } + break; + + case '.': /* Button data, part2 */ + if (spaceball->idx != 4) return; + input_report_key(dev, BTN_LEFT, data[2] & 1); + input_report_key(dev, BTN_RIGHT, data[2] & 2); + break; + + case '?': /* Error packet */ + spaceball->data[spaceball->idx - 1] = 0; + printk(KERN_ERR "spaceball: Device error. [%s]\n", spaceball->data + 1); + break; + } +} + +/* + * Spaceball 4000 FLX packets all start with a one letter packet-type decriptor, + * and end in 0x0d. It uses '^' as an escape for 0x0d characters which can + * occur in the axis values. ^M, ^Q and ^S all mean 0x0d, depending (I think) + * on whether the axis value is increasing, decreasing, or same as before. + * (I don't see why this is useful). + */ + +static void spaceball_interrupt(struct serio *serio, unsigned char data, unsigned int flags) +{ + struct spaceball *spaceball = serio->private; + + switch (data) { + case 0xd: + if (spaceball->idx) + spaceball_process_packet(spaceball); + spaceball->idx = 0; + spaceball->escape = 0; + return; + case 'M': + case 'Q': + case 'S': + if (spaceball->escape) + data = 0xd; + case '^': + spaceball->escape ^= 1; + default: + if (spaceball->escape) { + printk(KERN_WARNING "spaceball.c: Unknown escaped character: %#x\n", data); + spaceball->escape = 0; + } + if (spaceball->idx < JS_SBALL_MAX_LENGTH) + spaceball->data[spaceball->idx++] = data; + return; + } +} + +/* + * spaceball_disconnect() is the opposite of spaceball_connect() + */ + +static void spaceball_disconnect(struct serio *serio) +{ + struct spaceball* spaceball = serio->private; + input_unregister_device(&spaceball->dev); + serio_close(serio); + kfree(spaceball); +} + +/* + * spaceball_connect() is the routine that is called when someone adds a + * new serio device. It looks for the Magellan, and if found, registers + * it as an input device. + */ + +static void spaceball_connect(struct serio *serio, struct serio_dev *dev) +{ + struct spaceball *spaceball; + int i, t; + + if (serio->type != (SERIO_RS232 | SERIO_SPACEBALL)) + return; + + if (!(spaceball = kmalloc(sizeof(struct spaceball), GFP_KERNEL))) + return; + memset(spaceball, 0, sizeof(struct spaceball)); + + spaceball->dev.evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); + spaceball->dev.keybit[LONG(BTN_LEFT)] = BIT(BTN_LEFT) | BIT(BTN_RIGHT); + + for (i = 0; i < 6; i++) { + t = spaceball_axes[i]; + set_bit(t, spaceball->dev.absbit); + spaceball->dev.absmin[t] = i < 3 ? -10000 : -2000; + spaceball->dev.absmax[t] = i < 3 ? 10000 : 2000; + spaceball->dev.absflat[t] = i < 3 ? 50 : 10; + spaceball->dev.absfuzz[t] = i < 3 ? 12 : 2; + } + + spaceball->serio = serio; + spaceball->dev.private = spaceball; + + spaceball->dev.name = spaceball_name; + spaceball->dev.idbus = BUS_RS232; + spaceball->dev.idvendor = SERIO_SPACEBALL; + spaceball->dev.idproduct = 0x0001; + spaceball->dev.idversion = 0x0100; + + serio->private = spaceball; + + if (serio_open(serio, dev)) { + kfree(spaceball); + return; + } + + input_register_device(&spaceball->dev); +} + +/* + * The serio device structure. + */ + +static struct serio_dev spaceball_dev = { + interrupt: spaceball_interrupt, + connect: spaceball_connect, + disconnect: spaceball_disconnect, +}; + +/* + * The functions for inserting/removing us as a module. + */ + +int __init spaceball_init(void) +{ + serio_register_device(&spaceball_dev); + return 0; +} + +void __exit spaceball_exit(void) +{ + serio_unregister_device(&spaceball_dev); +} + +module_init(spaceball_init); +module_exit(spaceball_exit); |