cregit-Linux how code gets into the kernel

Release 4.11 drivers/input/joystick/magellan.c

/*
 *  Copyright (c) 1999-2001 Vojtech Pavlik
 */

/*
 * Magellan and Space Mouse 6dof controller 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@ucw.cz>, or by paper mail:
 * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/serio.h>


#define DRIVER_DESC	"Magellan and SpaceMouse 6dof controller driver"

MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");

MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

/*
 * Definitions & global arrays.
 */


#define	MAGELLAN_MAX_LENGTH	32


static int magellan_buttons[] = { BTN_0, BTN_1, BTN_2, BTN_3, BTN_4, BTN_5, BTN_6, BTN_7, BTN_8 };

static int magellan_axes[] = { ABS_X, ABS_Y, ABS_Z, ABS_RX, ABS_RY, ABS_RZ };

/*
 * Per-Magellan data.
 */


struct magellan {
	
struct input_dev *dev;
	
int idx;
	
unsigned char data[MAGELLAN_MAX_LENGTH];
	
char phys[32];
};

/*
 * magellan_crunch_nibbles() verifies that the bytes sent from the Magellan
 * have correct upper nibbles for the lower ones, if not, the packet will
 * be thrown away. It also strips these upper halves to simplify further
 * processing.
 */


static int magellan_crunch_nibbles(unsigned char *data, int count) { static unsigned char nibbles[16] = "0AB3D56GH9:K<MN?"; do { if (data[count] == nibbles[data[count] & 0xf]) data[count] = data[count] & 0xf; else return -1; } while (--count); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)70100.00%1100.00%
Total70100.00%1100.00%


static void magellan_process_packet(struct magellan* magellan) { struct input_dev *dev = magellan->dev; unsigned char *data = magellan->data; int i, t; if (!magellan->idx) return; switch (magellan->data[0]) { case 'd': /* Axis data */ if (magellan->idx != 25) return; if (magellan_crunch_nibbles(data, 24)) return; for (i = 0; i < 6; i++) input_report_abs(dev, magellan_axes[i], (data[(i << 2) + 1] << 12 | data[(i << 2) + 2] << 8 | data[(i << 2) + 3] << 4 | data[(i << 2) + 4]) - 32768); break; case 'k': /* Button data */ if (magellan->idx != 4) return; if (magellan_crunch_nibbles(data, 3)) return; t = (data[1] << 1) | (data[2] << 5) | data[3]; for (i = 0; i < 9; i++) input_report_key(dev, magellan_buttons[i], (t >> i) & 1); break; } input_sync(dev); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)23497.91%150.00%
Vojtech Pavlik52.09%150.00%
Total239100.00%2100.00%


static irqreturn_t magellan_interrupt(struct serio *serio, unsigned char data, unsigned int flags) { struct magellan* magellan = serio_get_drvdata(serio); if (data == '\r') { magellan_process_packet(magellan); magellan->idx = 0; } else { if (magellan->idx < MAGELLAN_MAX_LENGTH) magellan->data[magellan->idx++] = data; } return IRQ_HANDLED; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)6790.54%133.33%
Andrew Morton45.41%133.33%
Dmitry Torokhov34.05%133.33%
Total74100.00%3100.00%

/* * magellan_disconnect() is the opposite of magellan_connect() */
static void magellan_disconnect(struct serio *serio) { struct magellan* magellan = serio_get_drvdata(serio); serio_close(serio); serio_set_drvdata(serio, NULL); input_unregister_device(magellan->dev); kfree(magellan); }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)2862.22%133.33%
Dmitry Torokhov1737.78%266.67%
Total45100.00%3100.00%

/* * magellan_connect() is the routine that is called when someone adds a * new serio device that supports Magellan protocol and registers it as * an input device. */
static int magellan_connect(struct serio *serio, struct serio_driver *drv) { struct magellan *magellan; struct input_dev *input_dev; int err = -ENOMEM; int i; magellan = kzalloc(sizeof(struct magellan), GFP_KERNEL); input_dev = input_allocate_device(); if (!magellan || !input_dev) goto fail1; magellan->dev = input_dev; snprintf(magellan->phys, sizeof(magellan->phys), "%s/input0", serio->phys); input_dev->name = "LogiCad3D Magellan / SpaceMouse"; input_dev->phys = magellan->phys; input_dev->id.bustype = BUS_RS232; input_dev->id.vendor = SERIO_MAGELLAN; input_dev->id.product = 0x0001; input_dev->id.version = 0x0100; input_dev->dev.parent = &serio->dev; input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); for (i = 0; i < 9; i++) set_bit(magellan_buttons[i], input_dev->keybit); for (i = 0; i < 6; i++) input_set_abs_params(input_dev, magellan_axes[i], -360, 360, 0, 0); serio_set_drvdata(serio, magellan); err = serio_open(serio, drv); if (err) goto fail2; err = input_register_device(magellan->dev); if (err) goto fail3; return 0; fail3: serio_close(serio); fail2: serio_set_drvdata(serio, NULL); fail1: input_free_device(input_dev); kfree(magellan); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov17559.52%763.64%
Linus Torvalds (pre-git)11338.44%19.09%
Vojtech Pavlik41.36%218.18%
Jiri Slaby20.68%19.09%
Total294100.00%11100.00%

/* * The serio driver structure. */ static struct serio_device_id magellan_serio_ids[] = { { .type = SERIO_RS232, .proto = SERIO_MAGELLAN, .id = SERIO_ANY, .extra = SERIO_ANY, }, { 0 } }; MODULE_DEVICE_TABLE(serio, magellan_serio_ids); static struct serio_driver magellan_drv = { .driver = { .name = "magellan", }, .description = DRIVER_DESC, .id_table = magellan_serio_ids, .interrupt = magellan_interrupt, .connect = magellan_connect, .disconnect = magellan_disconnect, }; module_serio_driver(magellan_drv);

Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds (pre-git)61566.34%15.00%
Dmitry Torokhov26728.80%1050.00%
Vojtech Pavlik353.78%420.00%
Andrew Morton40.43%15.00%
Axel Lin20.22%15.00%
Jiri Slaby20.22%15.00%
Linus Torvalds10.11%15.00%
Adrian Bunk10.11%15.00%
Total927100.00%20100.00%
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