drivers/input/touchscreen/elo.c - linux/kernel/git/mellanox/linux - Git at Google

 /*
  * Elo serial touchscreen driver
  *
  * Copyright (c) 2004 Vojtech Pavlik
  */

 /*
  * 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.
  */

 /*
  * This driver can handle serial Elo touchscreens using either the Elo standard
  * 'E271-2210' 10-byte protocol, Elo legacy 'E281A-4002' 6-byte protocol, Elo
  * legacy 'E271-140' 4-byte protocol and Elo legacy 'E261-280' 3-byte 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>
 #include <linux/init.h>

 #define DRIVER_DESC	"Elo serial touchscreen driver"

 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
 MODULE_DESCRIPTION(DRIVER_DESC);
 MODULE_LICENSE("GPL");

 /*
  * Definitions & global arrays.
  */

 #define	ELO_MAX_LENGTH	10

 /*
  * Per-touchscreen data.
  */

 struct elo {
 	struct input_dev *dev;
 	struct serio *serio;
 	int id;
 	int idx;
 	unsigned char csum;
 	unsigned char data[ELO_MAX_LENGTH];
 	char phys[32];
 };

 static void elo_process_data_10(struct elo* elo, unsigned char data, struct pt_regs *regs)
 {
 	struct input_dev *dev = elo->dev;

 	elo->csum += elo->data[elo->idx] = data;

 	switch (elo->idx++) {

 		case 0:
 			if (data != 'U') {
 				elo->idx = 0;
 				elo->csum = 0;
 			}
 			break;

 		case 1:
 			if (data != 'T') {
 				elo->idx = 0;
 				elo->csum = 0;
 			}
 			break;

 		case 9:
 			if (elo->csum) {
 				input_regs(dev, regs);
 				input_report_abs(dev, ABS_X, (elo->data[4] << 8) | elo->data[3]);
 				input_report_abs(dev, ABS_Y, (elo->data[6] << 8) | elo->data[5]);
 				input_report_abs(dev, ABS_PRESSURE, (elo->data[8] << 8) | elo->data[7]);
 				input_report_key(dev, BTN_TOUCH, elo->data[8] || elo->data[7]);
 				input_sync(dev);
 			}
 			elo->idx = 0;
 			elo->csum = 0;
 			break;
 	}
 }

 static void elo_process_data_6(struct elo* elo, unsigned char data, struct pt_regs *regs)
 {
 	struct input_dev *dev = elo->dev;

 	elo->data[elo->idx] = data;

 	switch (elo->idx++) {

 		case 0: if ((data & 0xc0) != 0xc0) elo->idx = 0; break;
 		case 1: if ((data & 0xc0) != 0x80) elo->idx = 0; break;
 		case 2: if ((data & 0xc0) != 0x40) elo->idx = 0; break;

 		case 3:
 			if (data & 0xc0) {
 				elo->idx = 0;
 				break;
 			}

 			input_regs(dev, regs);
 			input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) | (elo->data[1] & 0x3f));
 			input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) | (elo->data[3] & 0x3f));

 			if (elo->id == 2) {
 				input_report_key(dev, BTN_TOUCH, 1);
 				input_sync(dev);
 				elo->idx = 0;
 			}

 			break;

 		case 4:
 			if (data) {
 				input_sync(dev);
 				elo->idx = 0;
 			}
 			break;

 		case 5:
 			if ((data & 0xf0) == 0) {
 				input_report_abs(dev, ABS_PRESSURE, elo->data[5]);
 				input_report_key(dev, BTN_TOUCH, !!elo->data[5]);
 			}
 			input_sync(dev);
 			elo->idx = 0;
 			break;
 	}
 }

 static void elo_process_data_3(struct elo* elo, unsigned char data, struct pt_regs *regs)
 {
 	struct input_dev *dev = elo->dev;

 	elo->data[elo->idx] = data;

 	switch (elo->idx++) {

 		case 0:
 			if ((data & 0x7f) != 0x01)
 				elo->idx = 0;
 			break;
 		case 2:
 			input_regs(dev, regs);
 			input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80));
 			input_report_abs(dev, ABS_X, elo->data[1]);
 			input_report_abs(dev, ABS_Y, elo->data[2]);
 			input_sync(dev);
 			elo->idx = 0;
 			break;
 	}
 }

 static irqreturn_t elo_interrupt(struct serio *serio,
 		unsigned char data, unsigned int flags, struct pt_regs *regs)
 {
 	struct elo* elo = serio_get_drvdata(serio);

 	switch(elo->id) {
 		case 0:
 			elo_process_data_10(elo, data, regs);
 			break;

 		case 1:
 		case 2:
 			elo_process_data_6(elo, data, regs);
 			break;

 		case 3:
 			elo_process_data_3(elo, data, regs);
 			break;
 	}

 	return IRQ_HANDLED;
 }

 /*
  * elo_disconnect() is the opposite of elo_connect()
  */

 static void elo_disconnect(struct serio *serio)
 {
 	struct elo* elo = serio_get_drvdata(serio);

 	input_unregister_device(elo->dev);
 	serio_close(serio);
 	serio_set_drvdata(serio, NULL);
 	kfree(elo);
 }

 /*
  * elo_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 elo_connect(struct serio *serio, struct serio_driver *drv)
 {
 	struct elo *elo;
 	struct input_dev *input_dev;
 	int err;

 	elo = kzalloc(sizeof(struct elo), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!elo || !input_dev) {
 		err = -ENOMEM;
 		goto fail;
 	}

 	elo->serio = serio;
 	elo->id = serio->id.id;
 	elo->dev = input_dev;
 	snprintf(elo->phys, sizeof(elo->phys), "%s/input0", serio->phys);

 	input_dev->private = elo;
 	input_dev->name = "Elo Serial TouchScreen";
 	input_dev->phys = elo->phys;
 	input_dev->id.bustype = BUS_RS232;
 	input_dev->id.vendor = SERIO_ELO;
 	input_dev->id.product = elo->id;
 	input_dev->id.version = 0x0100;
 	input_dev->cdev.dev = &serio->dev;

 	input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
 	input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);

 	switch (elo->id) {

 		case 0: /* 10-byte protocol */
 			input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
 			input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
 			input_set_abs_params(input_dev, ABS_PRESSURE, 0, 255, 0, 0);
 			break;

 		case 1: /* 6-byte protocol */
 			input_set_abs_params(input_dev, ABS_PRESSURE, 0, 15, 0, 0);

 		case 2: /* 4-byte protocol */
 			input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
 			input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
 			break;

 		case 3: /* 3-byte protocol */
 			input_set_abs_params(input_dev, ABS_X, 0, 255, 0, 0);
 			input_set_abs_params(input_dev, ABS_Y, 0, 255, 0, 0);
 			break;
 	}

 	serio_set_drvdata(serio, elo);

 	err = serio_open(serio, drv);
 	if (err)
 		goto fail;

 	input_register_device(elo->dev);
 	return 0;

  fail:	serio_set_drvdata(serio, NULL);
 	input_free_device(input_dev);
 	kfree(elo);
 	return err;
 }

 /*
  * The serio driver structure.
  */

 static struct serio_device_id elo_serio_ids[] = {
 	{
 		.type	= SERIO_RS232,
 		.proto	= SERIO_ELO,
 		.id	= SERIO_ANY,
 		.extra	= SERIO_ANY,
 	},
 	{ 0 }
 };

 MODULE_DEVICE_TABLE(serio, elo_serio_ids);

 static struct serio_driver elo_drv = {
 	.driver		= {
 		.name	= "elo",
 	},
 	.description	= DRIVER_DESC,
 	.id_table	= elo_serio_ids,
 	.interrupt	= elo_interrupt,
 	.connect	= elo_connect,
 	.disconnect	= elo_disconnect,
 };

 /*
  * The functions for inserting/removing us as a module.
  */

 static int __init elo_init(void)
 {
 	serio_register_driver(&elo_drv);
 	return 0;
 }

 static void __exit elo_exit(void)
 {
 	serio_unregister_driver(&elo_drv);
 }

 module_init(elo_init);
 module_exit(elo_exit);
	/*
	* Elo serial touchscreen driver
	*
	* Copyright (c) 2004 Vojtech Pavlik
	*/

	/*
	* 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.
	*/

	/*
	* This driver can handle serial Elo touchscreens using either the Elo standard
	* 'E271-2210' 10-byte protocol, Elo legacy 'E281A-4002' 6-byte protocol, Elo
	* legacy 'E271-140' 4-byte protocol and Elo legacy 'E261-280' 3-byte 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>
	#include <linux/init.h>

	#define DRIVER_DESC "Elo serial touchscreen driver"

	MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
	MODULE_DESCRIPTION(DRIVER_DESC);
	MODULE_LICENSE("GPL");

	/*
	* Definitions & global arrays.
	*/

	#define ELO_MAX_LENGTH 10

	/*
	* Per-touchscreen data.
	*/

	struct elo {
	struct input_dev *dev;
	struct serio *serio;
	int id;
	int idx;
	unsigned char csum;
	unsigned char data[ELO_MAX_LENGTH];
	char phys[32];
	};

	static void elo_process_data_10(struct elo* elo, unsigned char data, struct pt_regs *regs)
	{
	struct input_dev *dev = elo->dev;

	elo->csum += elo->data[elo->idx] = data;

	switch (elo->idx++) {

	case 0:
	if (data != 'U') {
	elo->idx = 0;
	elo->csum = 0;
	}
	break;

	case 1:
	if (data != 'T') {
	elo->idx = 0;
	elo->csum = 0;
	}
	break;

	case 9:
	if (elo->csum) {
	input_regs(dev, regs);
	input_report_abs(dev, ABS_X, (elo->data[4] << 8) \| elo->data[3]);
	input_report_abs(dev, ABS_Y, (elo->data[6] << 8) \| elo->data[5]);
	input_report_abs(dev, ABS_PRESSURE, (elo->data[8] << 8) \| elo->data[7]);
	input_report_key(dev, BTN_TOUCH, elo->data[8] \|\| elo->data[7]);
	input_sync(dev);
	}
	elo->idx = 0;
	elo->csum = 0;
	break;
	}
	}

	static void elo_process_data_6(struct elo* elo, unsigned char data, struct pt_regs *regs)
	{
	struct input_dev *dev = elo->dev;

	elo->data[elo->idx] = data;

	switch (elo->idx++) {

	case 0: if ((data & 0xc0) != 0xc0) elo->idx = 0; break;
	case 1: if ((data & 0xc0) != 0x80) elo->idx = 0; break;
	case 2: if ((data & 0xc0) != 0x40) elo->idx = 0; break;

	case 3:
	if (data & 0xc0) {
	elo->idx = 0;
	break;
	}

	input_regs(dev, regs);
	input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) \| (elo->data[1] & 0x3f));
	input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) \| (elo->data[3] & 0x3f));

	if (elo->id == 2) {
	input_report_key(dev, BTN_TOUCH, 1);
	input_sync(dev);
	elo->idx = 0;
	}

	break;

	case 4:
	if (data) {
	input_sync(dev);
	elo->idx = 0;
	}
	break;

	case 5:
	if ((data & 0xf0) == 0) {
	input_report_abs(dev, ABS_PRESSURE, elo->data[5]);
	input_report_key(dev, BTN_TOUCH, !!elo->data[5]);
	}
	input_sync(dev);
	elo->idx = 0;
	break;
	}
	}

	static void elo_process_data_3(struct elo* elo, unsigned char data, struct pt_regs *regs)
	{
	struct input_dev *dev = elo->dev;

	elo->data[elo->idx] = data;

	switch (elo->idx++) {

	case 0:
	if ((data & 0x7f) != 0x01)
	elo->idx = 0;
	break;
	case 2:
	input_regs(dev, regs);
	input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80));
	input_report_abs(dev, ABS_X, elo->data[1]);
	input_report_abs(dev, ABS_Y, elo->data[2]);
	input_sync(dev);
	elo->idx = 0;
	break;
	}
	}

	static irqreturn_t elo_interrupt(struct serio *serio,
	unsigned char data, unsigned int flags, struct pt_regs *regs)
	{
	struct elo* elo = serio_get_drvdata(serio);

	switch(elo->id) {
	case 0:
	elo_process_data_10(elo, data, regs);
	break;

	case 1:
	case 2:
	elo_process_data_6(elo, data, regs);
	break;

	case 3:
	elo_process_data_3(elo, data, regs);
	break;
	}

	return IRQ_HANDLED;
	}

	/*
	* elo_disconnect() is the opposite of elo_connect()
	*/

	static void elo_disconnect(struct serio *serio)
	{
	struct elo* elo = serio_get_drvdata(serio);

	input_unregister_device(elo->dev);
	serio_close(serio);
	serio_set_drvdata(serio, NULL);
	kfree(elo);
	}

	/*
	* elo_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 elo_connect(struct serio serio, struct serio_driver drv)
	{
	struct elo *elo;
	struct input_dev *input_dev;
	int err;

	elo = kzalloc(sizeof(struct elo), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!elo \|\| !input_dev) {
	err = -ENOMEM;
	goto fail;
	}

	elo->serio = serio;
	elo->id = serio->id.id;
	elo->dev = input_dev;
	snprintf(elo->phys, sizeof(elo->phys), "%s/input0", serio->phys);

	input_dev->private = elo;
	input_dev->name = "Elo Serial TouchScreen";
	input_dev->phys = elo->phys;
	input_dev->id.bustype = BUS_RS232;
	input_dev->id.vendor = SERIO_ELO;
	input_dev->id.product = elo->id;
	input_dev->id.version = 0x0100;
	input_dev->cdev.dev = &serio->dev;

	input_dev->evbit[0] = BIT(EV_KEY) \| BIT(EV_ABS);
	input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);

	switch (elo->id) {

	case 0: /* 10-byte protocol */
	input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
	input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
	input_set_abs_params(input_dev, ABS_PRESSURE, 0, 255, 0, 0);
	break;

	case 1: /* 6-byte protocol */
	input_set_abs_params(input_dev, ABS_PRESSURE, 0, 15, 0, 0);

	case 2: /* 4-byte protocol */
	input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
	input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
	break;

	case 3: /* 3-byte protocol */
	input_set_abs_params(input_dev, ABS_X, 0, 255, 0, 0);
	input_set_abs_params(input_dev, ABS_Y, 0, 255, 0, 0);
	break;
	}

	serio_set_drvdata(serio, elo);

	err = serio_open(serio, drv);
	if (err)
	goto fail;

	input_register_device(elo->dev);
	return 0;

	fail: serio_set_drvdata(serio, NULL);
	input_free_device(input_dev);
	kfree(elo);
	return err;
	}

	/*
	* The serio driver structure.
	*/

	static struct serio_device_id elo_serio_ids[] = {
	{
	.type = SERIO_RS232,
	.proto = SERIO_ELO,
	.id = SERIO_ANY,
	.extra = SERIO_ANY,
	},
	{ 0 }
	};

	MODULE_DEVICE_TABLE(serio, elo_serio_ids);

	static struct serio_driver elo_drv = {
	.driver = {
	.name = "elo",
	},
	.description = DRIVER_DESC,
	.id_table = elo_serio_ids,
	.interrupt = elo_interrupt,
	.connect = elo_connect,
	.disconnect = elo_disconnect,
	};

	/*
	* The functions for inserting/removing us as a module.
	*/

	static int __init elo_init(void)
	{
	serio_register_driver(&elo_drv);
	return 0;
	}

	static void __exit elo_exit(void)
	{
	serio_unregister_driver(&elo_drv);
	}

	module_init(elo_init);
	module_exit(elo_exit);