Orange Pi5 kernel

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Dynapro serial touchscreen driver
 *
 * Copyright (c) 2009 Tias Guns
 * Based on the inexio driver (c) Vojtech Pavlik and Dan Streetman and
 * Richard Lemon
 */
 
 
/*
 * 2009/09/19 Tias Guns <tias@ulyssis.org>
 *   Copied inexio.c and edited for Dynapro protocol (from retired Xorg module)
 */
 
#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	"Dynapro serial touchscreen driver"
 
MODULE_AUTHOR("Tias Guns <tias@ulyssis.org>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
 
/*
 * Definitions & global arrays.
 */
 
#define DYNAPRO_FORMAT_TOUCH_BIT 0x40
#define DYNAPRO_FORMAT_LENGTH 3
#define DYNAPRO_RESPONSE_BEGIN_BYTE 0x80
 
#define DYNAPRO_MIN_XC 0
#define DYNAPRO_MAX_XC 0x3ff
#define DYNAPRO_MIN_YC 0
#define DYNAPRO_MAX_YC 0x3ff
 
#define DYNAPRO_GET_XC(data) (data[1] | ((data[0] & 0x38) << 4))
#define DYNAPRO_GET_YC(data) (data[2] | ((data[0] & 0x07) << 7))
#define DYNAPRO_GET_TOUCHED(data) (DYNAPRO_FORMAT_TOUCH_BIT & data[0])
 
/*
 * Per-touchscreen data.
 */
 
struct dynapro {
<------>struct input_dev *dev;
<------>struct serio *serio;
<------>int idx;
<------>unsigned char data[DYNAPRO_FORMAT_LENGTH];
<------>char phys[32];
};
 
static void dynapro_process_data(struct dynapro *pdynapro)
{
<------>struct input_dev *dev = pdynapro->dev;
 
<------>if (DYNAPRO_FORMAT_LENGTH == ++pdynapro->idx) {
<------><------>input_report_abs(dev, ABS_X, DYNAPRO_GET_XC(pdynapro->data));
<------><------>input_report_abs(dev, ABS_Y, DYNAPRO_GET_YC(pdynapro->data));
<------><------>input_report_key(dev, BTN_TOUCH,
<------><------><------><------> DYNAPRO_GET_TOUCHED(pdynapro->data));
<------><------>input_sync(dev);
 
<------><------>pdynapro->idx = 0;
<------>}
}
 
static irqreturn_t dynapro_interrupt(struct serio *serio,
<------><------>unsigned char data, unsigned int flags)
{
<------>struct dynapro *pdynapro = serio_get_drvdata(serio);
 
<------>pdynapro->data[pdynapro->idx] = data;
 
<------>if (DYNAPRO_RESPONSE_BEGIN_BYTE & pdynapro->data[0])
<------><------>dynapro_process_data(pdynapro);
<------>else
<------><------>dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n",
<------><------><------>pdynapro->data[0]);
 
<------>return IRQ_HANDLED;
}
 
static void dynapro_disconnect(struct serio *serio)
{
<------>struct dynapro *pdynapro = serio_get_drvdata(serio);
 
<------>input_get_device(pdynapro->dev);
<------>input_unregister_device(pdynapro->dev);
<------>serio_close(serio);
<------>serio_set_drvdata(serio, NULL);
<------>input_put_device(pdynapro->dev);
<------>kfree(pdynapro);
}
 
/*
 * dynapro_connect() is the routine that is called when someone adds a
 * new serio device that supports dynapro protocol and registers it as
 * an input device. This is usually accomplished using inputattach.
 */
 
static int dynapro_connect(struct serio *serio, struct serio_driver *drv)
{
<------>struct dynapro *pdynapro;
<------>struct input_dev *input_dev;
<------>int err;
 
<------>pdynapro = kzalloc(sizeof(struct dynapro), GFP_KERNEL);
<------>input_dev = input_allocate_device();
<------>if (!pdynapro || !input_dev) {
<------><------>err = -ENOMEM;
<------><------>goto fail1;
<------>}
 
<------>pdynapro->serio = serio;
<------>pdynapro->dev = input_dev;
<------>snprintf(pdynapro->phys, sizeof(pdynapro->phys),
<------><------> "%s/input0", serio->phys);
 
<------>input_dev->name = "Dynapro Serial TouchScreen";
<------>input_dev->phys = pdynapro->phys;
<------>input_dev->id.bustype = BUS_RS232;
<------>input_dev->id.vendor = SERIO_DYNAPRO;
<------>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(pdynapro->dev, ABS_X,
<------><------><------>     DYNAPRO_MIN_XC, DYNAPRO_MAX_XC, 0, 0);
<------>input_set_abs_params(pdynapro->dev, ABS_Y,
<------><------><------>     DYNAPRO_MIN_YC, DYNAPRO_MAX_YC, 0, 0);
 
<------>serio_set_drvdata(serio, pdynapro);
 
<------>err = serio_open(serio, drv);
<------>if (err)
<------><------>goto fail2;
 
<------>err = input_register_device(pdynapro->dev);
<------>if (err)
<------><------>goto fail3;
 
<------>return 0;
 
 fail3:	serio_close(serio);
 fail2:	serio_set_drvdata(serio, NULL);
 fail1:	input_free_device(input_dev);
<------>kfree(pdynapro);
<------>return err;
}
 
/*
 * The serio driver structure.
 */
 
static const struct serio_device_id dynapro_serio_ids[] = {
<------>{
<------><------>.type	= SERIO_RS232,
<------><------>.proto	= SERIO_DYNAPRO,
<------><------>.id	= SERIO_ANY,
<------><------>.extra	= SERIO_ANY,
<------>},
<------>{ 0 }
};
 
MODULE_DEVICE_TABLE(serio, dynapro_serio_ids);
 
static struct serio_driver dynapro_drv = {
<------>.driver		= {
<------><------>.name	= "dynapro",
<------>},
<------>.description	= DRIVER_DESC,
<------>.id_table	= dynapro_serio_ids,
<------>.interrupt	= dynapro_interrupt,
<------>.connect	= dynapro_connect,
<------>.disconnect	= dynapro_disconnect,
};
 
module_serio_driver(dynapro_drv);