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>
177 lines
4 KiB
C
177 lines
4 KiB
C
/*
|
|
* Fujitsu serial touchscreen driver
|
|
*
|
|
* Copyright (c) Dmitry Torokhov <dtor@mail.ru>
|
|
*/
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
#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 "Fujitsu serial touchscreen driver"
|
|
|
|
MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
#define FUJITSU_LENGTH 5
|
|
|
|
/*
|
|
* Per-touchscreen data.
|
|
*/
|
|
struct fujitsu {
|
|
struct input_dev *dev;
|
|
struct serio *serio;
|
|
int idx;
|
|
unsigned char data[FUJITSU_LENGTH];
|
|
char phys[32];
|
|
};
|
|
|
|
/*
|
|
* Decode serial data (5 bytes per packet)
|
|
* First byte
|
|
* 1 C 0 0 R S S S
|
|
* Where C is 1 while in calibration mode (which we don't use)
|
|
* R is 1 when no coordinate corection was done.
|
|
* S are button state
|
|
*/
|
|
static irqreturn_t fujitsu_interrupt(struct serio *serio,
|
|
unsigned char data, unsigned int flags)
|
|
{
|
|
struct fujitsu *fujitsu = serio_get_drvdata(serio);
|
|
struct input_dev *dev = fujitsu->dev;
|
|
|
|
if (fujitsu->idx == 0) {
|
|
/* resync skip until start of frame */
|
|
if ((data & 0xf0) != 0x80)
|
|
return IRQ_HANDLED;
|
|
} else {
|
|
/* resync skip garbage */
|
|
if (data & 0x80) {
|
|
fujitsu->idx = 0;
|
|
return IRQ_HANDLED;
|
|
}
|
|
}
|
|
|
|
fujitsu->data[fujitsu->idx++] = data;
|
|
if (fujitsu->idx == FUJITSU_LENGTH) {
|
|
input_report_abs(dev, ABS_X,
|
|
(fujitsu->data[2] << 7) | fujitsu->data[1]);
|
|
input_report_abs(dev, ABS_Y,
|
|
(fujitsu->data[4] << 7) | fujitsu->data[3]);
|
|
input_report_key(dev, BTN_TOUCH,
|
|
(fujitsu->data[0] & 0x03) != 2);
|
|
input_sync(dev);
|
|
fujitsu->idx = 0;
|
|
}
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
/*
|
|
* fujitsu_disconnect() is the opposite of fujitsu_connect()
|
|
*/
|
|
static void fujitsu_disconnect(struct serio *serio)
|
|
{
|
|
struct fujitsu *fujitsu = serio_get_drvdata(serio);
|
|
|
|
input_get_device(fujitsu->dev);
|
|
input_unregister_device(fujitsu->dev);
|
|
serio_close(serio);
|
|
serio_set_drvdata(serio, NULL);
|
|
input_put_device(fujitsu->dev);
|
|
kfree(fujitsu);
|
|
}
|
|
|
|
/*
|
|
* fujitsu_connect() is the routine that is called when someone adds a
|
|
* new serio device that supports the Fujitsu protocol and registers it
|
|
* as input device.
|
|
*/
|
|
static int fujitsu_connect(struct serio *serio, struct serio_driver *drv)
|
|
{
|
|
struct fujitsu *fujitsu;
|
|
struct input_dev *input_dev;
|
|
int err;
|
|
|
|
fujitsu = kzalloc(sizeof(struct fujitsu), GFP_KERNEL);
|
|
input_dev = input_allocate_device();
|
|
if (!fujitsu || !input_dev) {
|
|
err = -ENOMEM;
|
|
goto fail1;
|
|
}
|
|
|
|
fujitsu->serio = serio;
|
|
fujitsu->dev = input_dev;
|
|
snprintf(fujitsu->phys, sizeof(fujitsu->phys),
|
|
"%s/input0", serio->phys);
|
|
|
|
input_dev->name = "Fujitsu Serial Touchscreen";
|
|
input_dev->phys = fujitsu->phys;
|
|
input_dev->id.bustype = BUS_RS232;
|
|
input_dev->id.vendor = SERIO_FUJITSU;
|
|
input_dev->id.product = 0;
|
|
input_dev->id.version = 0x0100;
|
|
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, 0, 4096, 0, 0);
|
|
input_set_abs_params(input_dev, ABS_Y, 0, 4096, 0, 0);
|
|
serio_set_drvdata(serio, fujitsu);
|
|
|
|
err = serio_open(serio, drv);
|
|
if (err)
|
|
goto fail2;
|
|
|
|
err = input_register_device(fujitsu->dev);
|
|
if (err)
|
|
goto fail3;
|
|
|
|
return 0;
|
|
|
|
fail3:
|
|
serio_close(serio);
|
|
fail2:
|
|
serio_set_drvdata(serio, NULL);
|
|
fail1:
|
|
input_free_device(input_dev);
|
|
kfree(fujitsu);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* The serio driver structure.
|
|
*/
|
|
static const struct serio_device_id fujitsu_serio_ids[] = {
|
|
{
|
|
.type = SERIO_RS232,
|
|
.proto = SERIO_FUJITSU,
|
|
.id = SERIO_ANY,
|
|
.extra = SERIO_ANY,
|
|
},
|
|
{ 0 }
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE(serio, fujitsu_serio_ids);
|
|
|
|
static struct serio_driver fujitsu_drv = {
|
|
.driver = {
|
|
.name = "fujitsu_ts",
|
|
},
|
|
.description = DRIVER_DESC,
|
|
.id_table = fujitsu_serio_ids,
|
|
.interrupt = fujitsu_interrupt,
|
|
.connect = fujitsu_connect,
|
|
.disconnect = fujitsu_disconnect,
|
|
};
|
|
|
|
module_serio_driver(fujitsu_drv);
|