cregit-Linux how code gets into the kernel

Release 4.11 drivers/input/touchscreen/gunze.c

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

/*
 * Gunze AHL-51S touchscreen 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/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/serio.h>


#define DRIVER_DESC	"Gunze AHL-51S touchscreen driver"

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

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

/*
 * Definitions & global arrays.
 */


#define	GUNZE_MAX_LENGTH	10

/*
 * Per-touchscreen data.
 */


struct gunze {
	
struct input_dev *dev;
	
struct serio *serio;
	
int idx;
	
unsigned char data[GUNZE_MAX_LENGTH];
	
char phys[32];
};


static void gunze_process_packet(struct gunze* gunze) { struct input_dev *dev = gunze->dev; if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' || (gunze->data[0] != 'T' && gunze->data[0] != 'R')) { printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data); return; } input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10)); input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10)); input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T'); input_sync(dev); }

Contributors

PersonTokensPropCommitsCommitProp
Vojtech Pavlik13297.78%375.00%
Dmitry Torokhov32.22%125.00%
Total135100.00%4100.00%


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

Contributors

PersonTokensPropCommitsCommitProp
Vojtech Pavlik6790.54%133.33%
Andrew Morton45.41%133.33%
Dmitry Torokhov34.05%133.33%
Total74100.00%3100.00%

/* * gunze_disconnect() is the opposite of gunze_connect() */
static void gunze_disconnect(struct serio *serio) { struct gunze *gunze = serio_get_drvdata(serio); input_get_device(gunze->dev); input_unregister_device(gunze->dev); serio_close(serio); serio_set_drvdata(serio, NULL); input_put_device(gunze->dev); kfree(gunze); }

Contributors

PersonTokensPropCommitsCommitProp
Vojtech Pavlik3559.32%133.33%
Dmitry Torokhov2440.68%266.67%
Total59100.00%3100.00%

/* * gunze_connect() is the routine that is called when someone adds a * new serio device that supports Gunze protocol and registers it as * an input device. */
static int gunze_connect(struct serio *serio, struct serio_driver *drv) { struct gunze *gunze; struct input_dev *input_dev; int err; gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL); input_dev = input_allocate_device(); if (!gunze || !input_dev) { err = -ENOMEM; goto fail1; } gunze->serio = serio; gunze->dev = input_dev; snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys); input_dev->name = "Gunze AHL-51S TouchScreen"; input_dev->phys = gunze->phys; input_dev->id.bustype = BUS_RS232; input_dev->id.vendor = SERIO_GUNZE; input_dev->id.product = 0x0051; 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_TOUCH)] = BIT_MASK(BTN_TOUCH); input_set_abs_params(input_dev, ABS_X, 24, 1000, 0, 0); input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0); serio_set_drvdata(serio, gunze); err = serio_open(serio, drv); if (err) goto fail2; err = input_register_device(gunze->dev); if (err) goto fail3; return 0; fail3: serio_close(serio); fail2: serio_set_drvdata(serio, NULL); fail1: input_free_device(input_dev); kfree(gunze); return err; }

Contributors

PersonTokensPropCommitsCommitProp
Dmitry Torokhov19968.86%866.67%
Vojtech Pavlik8629.76%325.00%
Jiri Slaby41.38%18.33%
Total289100.00%12100.00%

/* * The serio driver structure. */ static struct serio_device_id gunze_serio_ids[] = { { .type = SERIO_RS232, .proto = SERIO_GUNZE, .id = SERIO_ANY, .extra = SERIO_ANY, }, { 0 } }; MODULE_DEVICE_TABLE(serio, gunze_serio_ids); static struct serio_driver gunze_drv = { .driver = { .name = "gunze", }, .description = DRIVER_DESC, .id_table = gunze_serio_ids, .interrupt = gunze_interrupt, .connect = gunze_connect, .disconnect = gunze_disconnect, }; module_serio_driver(gunze_drv);

Overall Contributors

PersonTokensPropCommitsCommitProp
Vojtech Pavlik41457.10%525.00%
Dmitry Torokhov30041.38%1155.00%
Andrew Morton40.55%15.00%
Jiri Slaby40.55%15.00%
Axel Lin20.28%15.00%
Adrian Bunk10.14%15.00%
Total725100.00%20100.00%
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