cregit-Linux how code gets into the kernel

Release 4.14 drivers/input/joystick/stinger.c

/*
 *  Copyright (c) 2000-2001 Vojtech Pavlik
 *  Copyright (c) 2000 Mark Fletcher
 */

/*
 * Gravis Stinger gamepad driver for Linux
 */

/*
 * This program is free warftware; 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	"Gravis Stinger gamepad driver"

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

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

/*
 * Constants.
 */


#define STINGER_MAX_LENGTH 8

/*
 * Per-Stinger data.
 */


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

/*
 * stinger_process_packet() decodes packets the driver receives from the
 * Stinger. It updates the data accordingly.
 */


static void stinger_process_packet(struct stinger *stinger) { struct input_dev *dev = stinger->dev; unsigned char *data = stinger->data; if (!stinger->idx) return; input_report_key(dev, BTN_A, ((data[0] & 0x20) >> 5)); input_report_key(dev, BTN_B, ((data[0] & 0x10) >> 4)); input_report_key(dev, BTN_C, ((data[0] & 0x08) >> 3)); input_report_key(dev, BTN_X, ((data[0] & 0x04) >> 2)); input_report_key(dev, BTN_Y, ((data[3] & 0x20) >> 5)); input_report_key(dev, BTN_Z, ((data[3] & 0x10) >> 4)); input_report_key(dev, BTN_TL, ((data[3] & 0x08) >> 3)); input_report_key(dev, BTN_TR, ((data[3] & 0x04) >> 2)); input_report_key(dev, BTN_SELECT, ((data[3] & 0x02) >> 1)); input_report_key(dev, BTN_START, (data[3] & 0x01)); input_report_abs(dev, ABS_X, (data[1] & 0x3F) - ((data[0] & 0x01) << 6)); input_report_abs(dev, ABS_Y, ((data[0] & 0x02) << 5) - (data[2] & 0x3F)); input_sync(dev); return; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds29298.32%266.67%
Vojtech Pavlik51.68%133.33%
Total297100.00%3100.00%

/* * stinger_interrupt() is called by the low level driver when characters * are ready for us. We then buffer them for further processing, or call the * packet processing routine. */
static irqreturn_t stinger_interrupt(struct serio *serio, unsigned char data, unsigned int flags) { struct stinger *stinger = serio_get_drvdata(serio); /* All Stinger packets are 4 bytes */ if (stinger->idx < STINGER_MAX_LENGTH) stinger->data[stinger->idx++] = data; if (stinger->idx == 4) { stinger_process_packet(stinger); stinger->idx = 0; } return IRQ_HANDLED; }

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds6790.54%133.33%
Andrew Morton45.41%133.33%
Dmitry Torokhov34.05%133.33%
Total74100.00%3100.00%

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

Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds2862.22%133.33%
Dmitry Torokhov1737.78%266.67%
Total45100.00%3100.00%

/* * stinger_connect() is the routine that is called when someone adds a * new serio device that supports Stinger protocol and registers it as * an input device. */
static int stinger_connect(struct serio *serio, struct serio_driver *drv) { struct stinger *stinger; struct input_dev *input_dev; int err = -ENOMEM; stinger = kmalloc(sizeof(struct stinger), GFP_KERNEL); input_dev = input_allocate_device(); if (!stinger || !input_dev) goto fail1; stinger->dev = input_dev; snprintf(stinger->phys, sizeof(stinger->phys), "%s/serio0", serio->phys); input_dev->name = "Gravis Stinger"; input_dev->phys = stinger->phys; input_dev->id.bustype = BUS_RS232; input_dev->id.vendor = SERIO_STINGER; 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); input_dev->keybit[BIT_WORD(BTN_A)] = BIT_MASK(BTN_A) | BIT_MASK(BTN_B) | BIT_MASK(BTN_C) | BIT_MASK(BTN_X) | BIT_MASK(BTN_Y) | BIT_MASK(BTN_Z) | BIT_MASK(BTN_TL) | BIT_MASK(BTN_TR) | BIT_MASK(BTN_START) | BIT_MASK(BTN_SELECT); input_set_abs_params(input_dev, ABS_X, -64, 64, 0, 4); input_set_abs_params(input_dev, ABS_Y, -64, 64, 0, 4); serio_set_drvdata(serio, stinger); err = serio_open(serio, drv); if (err) goto fail2; err = input_register_device(stinger->dev); if (err) goto fail3; return 0; fail3: serio_close(serio); fail2: serio_set_drvdata(serio, NULL); fail1: input_free_device(input_dev); kfree(stinger); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov18456.44%763.64%
Linus Torvalds12438.04%19.09%
Jiri Slaby133.99%19.09%
Vojtech Pavlik51.53%218.18%
Total326100.00%11100.00%

/* * The serio driver structure. */ static const struct serio_device_id stinger_serio_ids[] = { { .type = SERIO_RS232, .proto = SERIO_STINGER, .id = SERIO_ANY, .extra = SERIO_ANY, }, { 0 } }; MODULE_DEVICE_TABLE(serio, stinger_serio_ids); static struct serio_driver stinger_drv = { .driver = { .name = "stinger", }, .description = DRIVER_DESC, .id_table = stinger_serio_ids, .interrupt = stinger_interrupt, .connect = stinger_connect, .disconnect = stinger_disconnect, }; module_serio_driver(stinger_drv);

Overall Contributors

PersonTokensPropCommitsCommitProp
Linus Torvalds57263.20%210.00%
Dmitry Torokhov27530.39%945.00%
Vojtech Pavlik374.09%420.00%
Jiri Slaby131.44%15.00%
Andrew Morton40.44%15.00%
Axel Lin20.22%15.00%
Adrian Bunk10.11%15.00%
Arvind Yadav10.11%15.00%
Total905100.00%20100.00%
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