mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Arvind Yadav](/assets/img/avatar_default.png)
serio_device_id are not supposed to change at runtime. All functions working with serio_device_id provided by <linux/serio.h> work with const serio_device_id. So mark the non-const structs as const. Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
191 lines
4.5 KiB
C
191 lines
4.5 KiB
C
/*
|
|
* iNexio serial touchscreen driver
|
|
*
|
|
* Copyright (c) 2008 Richard Lemon
|
|
* Based on the mtouch driver (c) Vojtech Pavlik and Dan Streetman
|
|
*
|
|
*/
|
|
|
|
/*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License version 2 as published by
|
|
* the Free Software Foundation.
|
|
*/
|
|
|
|
/*
|
|
* 2008/06/19 Richard Lemon <richard@codelemon.com>
|
|
* Copied mtouch.c and edited for iNexio protocol
|
|
*/
|
|
|
|
#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 "iNexio serial touchscreen driver"
|
|
|
|
MODULE_AUTHOR("Richard Lemon <richard@codelemon.com>");
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
/*
|
|
* Definitions & global arrays.
|
|
*/
|
|
|
|
#define INEXIO_FORMAT_TOUCH_BIT 0x01
|
|
#define INEXIO_FORMAT_LENGTH 5
|
|
#define INEXIO_RESPONSE_BEGIN_BYTE 0x80
|
|
|
|
/* todo: check specs for max length of all responses */
|
|
#define INEXIO_MAX_LENGTH 16
|
|
|
|
#define INEXIO_MIN_XC 0
|
|
#define INEXIO_MAX_XC 0x3fff
|
|
#define INEXIO_MIN_YC 0
|
|
#define INEXIO_MAX_YC 0x3fff
|
|
|
|
#define INEXIO_GET_XC(data) (((data[1])<<7) | data[2])
|
|
#define INEXIO_GET_YC(data) (((data[3])<<7) | data[4])
|
|
#define INEXIO_GET_TOUCHED(data) (INEXIO_FORMAT_TOUCH_BIT & data[0])
|
|
|
|
/*
|
|
* Per-touchscreen data.
|
|
*/
|
|
|
|
struct inexio {
|
|
struct input_dev *dev;
|
|
struct serio *serio;
|
|
int idx;
|
|
unsigned char data[INEXIO_MAX_LENGTH];
|
|
char phys[32];
|
|
};
|
|
|
|
static void inexio_process_data(struct inexio *pinexio)
|
|
{
|
|
struct input_dev *dev = pinexio->dev;
|
|
|
|
if (INEXIO_FORMAT_LENGTH == ++pinexio->idx) {
|
|
input_report_abs(dev, ABS_X, INEXIO_GET_XC(pinexio->data));
|
|
input_report_abs(dev, ABS_Y, INEXIO_GET_YC(pinexio->data));
|
|
input_report_key(dev, BTN_TOUCH, INEXIO_GET_TOUCHED(pinexio->data));
|
|
input_sync(dev);
|
|
|
|
pinexio->idx = 0;
|
|
}
|
|
}
|
|
|
|
static irqreturn_t inexio_interrupt(struct serio *serio,
|
|
unsigned char data, unsigned int flags)
|
|
{
|
|
struct inexio* pinexio = serio_get_drvdata(serio);
|
|
|
|
pinexio->data[pinexio->idx] = data;
|
|
|
|
if (INEXIO_RESPONSE_BEGIN_BYTE&pinexio->data[0])
|
|
inexio_process_data(pinexio);
|
|
else
|
|
printk(KERN_DEBUG "inexio.c: unknown/unsynchronized data from device, byte %x\n",pinexio->data[0]);
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* inexio_disconnect() is the opposite of inexio_connect()
|
|
*/
|
|
|
|
static void inexio_disconnect(struct serio *serio)
|
|
{
|
|
struct inexio* pinexio = serio_get_drvdata(serio);
|
|
|
|
input_get_device(pinexio->dev);
|
|
input_unregister_device(pinexio->dev);
|
|
serio_close(serio);
|
|
serio_set_drvdata(serio, NULL);
|
|
input_put_device(pinexio->dev);
|
|
kfree(pinexio);
|
|
}
|
|
|
|
/*
|
|
* inexio_connect() is the routine that is called when someone adds a
|
|
* new serio device that supports iNexio protocol and registers it as
|
|
* an input device. This is usually accomplished using inputattach.
|
|
*/
|
|
|
|
static int inexio_connect(struct serio *serio, struct serio_driver *drv)
|
|
{
|
|
struct inexio *pinexio;
|
|
struct input_dev *input_dev;
|
|
int err;
|
|
|
|
pinexio = kzalloc(sizeof(struct inexio), GFP_KERNEL);
|
|
input_dev = input_allocate_device();
|
|
if (!pinexio || !input_dev) {
|
|
err = -ENOMEM;
|
|
goto fail1;
|
|
}
|
|
|
|
pinexio->serio = serio;
|
|
pinexio->dev = input_dev;
|
|
snprintf(pinexio->phys, sizeof(pinexio->phys), "%s/input0", serio->phys);
|
|
|
|
input_dev->name = "iNexio Serial TouchScreen";
|
|
input_dev->phys = pinexio->phys;
|
|
input_dev->id.bustype = BUS_RS232;
|
|
input_dev->id.vendor = SERIO_INEXIO;
|
|
input_dev->id.product = 0;
|
|
input_dev->id.version = 0x0001;
|
|
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(pinexio->dev, ABS_X, INEXIO_MIN_XC, INEXIO_MAX_XC, 0, 0);
|
|
input_set_abs_params(pinexio->dev, ABS_Y, INEXIO_MIN_YC, INEXIO_MAX_YC, 0, 0);
|
|
|
|
serio_set_drvdata(serio, pinexio);
|
|
|
|
err = serio_open(serio, drv);
|
|
if (err)
|
|
goto fail2;
|
|
|
|
err = input_register_device(pinexio->dev);
|
|
if (err)
|
|
goto fail3;
|
|
|
|
return 0;
|
|
|
|
fail3: serio_close(serio);
|
|
fail2: serio_set_drvdata(serio, NULL);
|
|
fail1: input_free_device(input_dev);
|
|
kfree(pinexio);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* The serio driver structure.
|
|
*/
|
|
|
|
static const struct serio_device_id inexio_serio_ids[] = {
|
|
{
|
|
.type = SERIO_RS232,
|
|
.proto = SERIO_INEXIO,
|
|
.id = SERIO_ANY,
|
|
.extra = SERIO_ANY,
|
|
},
|
|
{ 0 }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(serio, inexio_serio_ids);
|
|
|
|
static struct serio_driver inexio_drv = {
|
|
.driver = {
|
|
.name = "inexio",
|
|
},
|
|
.description = DRIVER_DESC,
|
|
.id_table = inexio_serio_ids,
|
|
.interrupt = inexio_interrupt,
|
|
.connect = inexio_connect,
|
|
.disconnect = inexio_disconnect,
|
|
};
|
|
|
|
module_serio_driver(inexio_drv);
|