[deliverable/linux.git] / drivers / input / touchscreen / elo.c

/*
 * 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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Elo serial touchscreen driver
	3	*
	4	* Copyright (c) 2004 Vojtech Pavlik
	5	*/
	6
	7	/*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License version 2 as published by
	10	* the Free Software Foundation.
	11	*/
	12
	13	/*
	14	* This driver can handle serial Elo touchscreens using either the Elo standard
	15	* 'E271-2210' 10-byte protocol, Elo legacy 'E281A-4002' 6-byte protocol, Elo
	16	* legacy 'E271-140' 4-byte protocol and Elo legacy 'E261-280' 3-byte protocol.
	17	*/
	18
	19	#include <linux/errno.h>
	20	#include <linux/kernel.h>
	21	#include <linux/module.h>
	22	#include <linux/slab.h>
	23	#include <linux/input.h>
	24	#include <linux/serio.h>
	25	#include <linux/init.h>
	26
	27	#define DRIVER_DESC "Elo serial touchscreen driver"
	28
	29	MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
	30	MODULE_DESCRIPTION(DRIVER_DESC);
	31	MODULE_LICENSE("GPL");
	32
	33	/*
	34	* Definitions & global arrays.
	35	*/
	36
	37	#define ELO_MAX_LENGTH 10
	38
1da177e4 LT	39	/*
	40	* Per-touchscreen data.
	41	*/
	42
	43	struct elo {
eca1ed19	44	struct input_dev *dev;
1da177e4 LT	45	struct serio *serio;
	46	int id;
	47	int idx;
	48	unsigned char csum;
	49	unsigned char data[ELO_MAX_LENGTH];
	50	char phys[32];
	51	};
	52
	53	static void elo_process_data_10(struct elo* elo, unsigned char data, struct pt_regs *regs)
	54	{
eca1ed19	55	struct input_dev *dev = elo->dev;
1da177e4 LT	56
	57	elo->csum += elo->data[elo->idx] = data;
	58
	59	switch (elo->idx++) {
	60
	61	case 0:
	62	if (data != 'U') {
	63	elo->idx = 0;
	64	elo->csum = 0;
	65	}
	66	break;
	67
	68	case 1:
	69	if (data != 'T') {
	70	elo->idx = 0;
	71	elo->csum = 0;
	72	}
	73	break;
	74
	75	case 9:
	76	if (elo->csum) {
	77	input_regs(dev, regs);
	78	input_report_abs(dev, ABS_X, (elo->data[4] << 8) \| elo->data[3]);
	79	input_report_abs(dev, ABS_Y, (elo->data[6] << 8) \| elo->data[5]);
	80	input_report_abs(dev, ABS_PRESSURE, (elo->data[8] << 8) \| elo->data[7]);
eca1ed19	81	input_report_key(dev, BTN_TOUCH, elo->data[8] \|\| elo->data[7]);
1da177e4 LT	82	input_sync(dev);
	83	}
	84	elo->idx = 0;
	85	elo->csum = 0;
	86	break;
	87	}
	88	}
	89
	90	static void elo_process_data_6(struct elo* elo, unsigned char data, struct pt_regs *regs)
	91	{
eca1ed19	92	struct input_dev *dev = elo->dev;
1da177e4 LT	93
	94	elo->data[elo->idx] = data;
	95
	96	switch (elo->idx++) {
	97
	98	case 0: if ((data & 0xc0) != 0xc0) elo->idx = 0; break;
	99	case 1: if ((data & 0xc0) != 0x80) elo->idx = 0; break;
	100	case 2: if ((data & 0xc0) != 0x40) elo->idx = 0; break;
	101
	102	case 3:
	103	if (data & 0xc0) {
	104	elo->idx = 0;
	105	break;
	106	}
	107
	108	input_regs(dev, regs);
	109	input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) \| (elo->data[1] & 0x3f));
	110	input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) \| (elo->data[3] & 0x3f));
	111
	112	if (elo->id == 2) {
	113	input_report_key(dev, BTN_TOUCH, 1);
	114	input_sync(dev);
	115	elo->idx = 0;
	116	}
	117
	118	break;
	119
	120	case 4:
	121	if (data) {
	122	input_sync(dev);
	123	elo->idx = 0;
	124	}
	125	break;
	126
	127	case 5:
	128	if ((data & 0xf0) == 0) {
	129	input_report_abs(dev, ABS_PRESSURE, elo->data[5]);
eca1ed19	130	input_report_key(dev, BTN_TOUCH, !!elo->data[5]);
1da177e4 LT	131	}
	132	input_sync(dev);
	133	elo->idx = 0;
	134	break;
	135	}
	136	}
	137
	138	static void elo_process_data_3(struct elo* elo, unsigned char data, struct pt_regs *regs)
	139	{
eca1ed19	140	struct input_dev *dev = elo->dev;
1da177e4 LT	141
	142	elo->data[elo->idx] = data;
	143
	144	switch (elo->idx++) {
	145
	146	case 0:
	147	if ((data & 0x7f) != 0x01)
	148	elo->idx = 0;
	149	break;
	150	case 2:
	151	input_regs(dev, regs);
	152	input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80));
	153	input_report_abs(dev, ABS_X, elo->data[1]);
	154	input_report_abs(dev, ABS_Y, elo->data[2]);
	155	input_sync(dev);
	156	elo->idx = 0;
	157	break;
	158	}
	159	}
	160
	161	static irqreturn_t elo_interrupt(struct serio *serio,
	162	unsigned char data, unsigned int flags, struct pt_regs *regs)
	163	{
	164	struct elo* elo = serio_get_drvdata(serio);
	165
	166	switch(elo->id) {
	167	case 0:
	168	elo_process_data_10(elo, data, regs);
	169	break;
	170
	171	case 1:
	172	case 2:
	173	elo_process_data_6(elo, data, regs);
	174	break;
	175
	176	case 3:
	177	elo_process_data_3(elo, data, regs);
	178	break;
	179	}
	180
	181	return IRQ_HANDLED;
	182	}
	183
	184	/*
	185	* elo_disconnect() is the opposite of elo_connect()
	186	*/
	187
	188	static void elo_disconnect(struct serio *serio)
	189	{
	190	struct elo* elo = serio_get_drvdata(serio);
	191
eca1ed19	192	input_unregister_device(elo->dev);
1da177e4 LT	193	serio_close(serio);
	194	serio_set_drvdata(serio, NULL);
	195	kfree(elo);
	196	}
	197
	198	/*
	199	* elo_connect() is the routine that is called when someone adds a
	200	* new serio device that supports Gunze protocol and registers it as
	201	* an input device.
	202	*/
	203
	204	static int elo_connect(struct serio serio, struct serio_driver drv)
	205	{
	206	struct elo *elo;
eca1ed19	207	struct input_dev *input_dev;
1da177e4 LT	208	int err;
1da177e4 LT	209
eca1ed19 DT	210	elo = kzalloc(sizeof(struct elo), GFP_KERNEL);
	211	input_dev = input_allocate_device();
	212	if (!elo \|\| !input_dev) {
	213	err = -ENOMEM;
	214	goto fail;
	215	}
1da177e4	216
eca1ed19 DT	217	elo->serio = serio;
	218	elo->id = serio->id.id;
	219	elo->dev = input_dev;
	220	snprintf(elo->phys, sizeof(elo->phys), "%s/input0", serio->phys);
1da177e4	221
eca1ed19 DT	222	input_dev->private = elo;
	223	input_dev->name = "Elo Serial TouchScreen";
	224	input_dev->phys = elo->phys;
	225	input_dev->id.bustype = BUS_RS232;
	226	input_dev->id.vendor = SERIO_ELO;
	227	input_dev->id.product = elo->id;
	228	input_dev->id.version = 0x0100;
	229	input_dev->cdev.dev = &serio->dev;
1da177e4	230
eca1ed19 DT	231	input_dev->evbit[0] = BIT(EV_KEY) \| BIT(EV_ABS);
eca1ed19 DT	232	input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
1da177e4 LT	233
	234	switch (elo->id) {
	235
	236	case 0: /* 10-byte protocol */
eca1ed19 DT	237	input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
	238	input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
	239	input_set_abs_params(input_dev, ABS_PRESSURE, 0, 255, 0, 0);
1da177e4	240	break;
de1b963a	241
1da177e4	242	case 1: /* 6-byte protocol */
eca1ed19	243	input_set_abs_params(input_dev, ABS_PRESSURE, 0, 15, 0, 0);
1da177e4 LT	244
1da177e4 LT	245	case 2: /* 4-byte protocol */
eca1ed19 DT	246	input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
eca1ed19 DT	247	input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
1da177e4 LT	248	break;
	249
	250	case 3: /* 3-byte protocol */
eca1ed19 DT	251	input_set_abs_params(input_dev, ABS_X, 0, 255, 0, 0);
eca1ed19 DT	252	input_set_abs_params(input_dev, ABS_Y, 0, 255, 0, 0);
1da177e4 LT	253	break;
	254	}
	255
1da177e4 LT	256	serio_set_drvdata(serio, elo);
	257
	258	err = serio_open(serio, drv);
eca1ed19 DT	259	if (err)
eca1ed19 DT	260	goto fail;
1da177e4	261
eca1ed19	262	input_register_device(elo->dev);
1da177e4	263	return 0;
eca1ed19 DT	264
	265	fail: serio_set_drvdata(serio, NULL);
	266	input_free_device(input_dev);
	267	kfree(elo);
	268	return err;
1da177e4 LT	269	}
	270
	271	/*
	272	* The serio driver structure.
	273	*/
	274
	275	static struct serio_device_id elo_serio_ids[] = {
	276	{
	277	.type = SERIO_RS232,
	278	.proto = SERIO_ELO,
	279	.id = SERIO_ANY,
	280	.extra = SERIO_ANY,
	281	},
	282	{ 0 }
	283	};
	284
	285	MODULE_DEVICE_TABLE(serio, elo_serio_ids);
	286
	287	static struct serio_driver elo_drv = {
	288	.driver = {
	289	.name = "elo",
	290	},
	291	.description = DRIVER_DESC,
	292	.id_table = elo_serio_ids,
	293	.interrupt = elo_interrupt,
	294	.connect = elo_connect,
	295	.disconnect = elo_disconnect,
	296	};
	297
	298	/*
	299	* The functions for inserting/removing us as a module.
	300	*/
	301
	302	static int __init elo_init(void)
	303	{
	304	serio_register_driver(&elo_drv);
	305	return 0;
	306	}
	307
	308	static void __exit elo_exit(void)
	309	{
	310	serio_unregister_driver(&elo_drv);
	311	}
	312
	313	module_init(elo_init);
	314	module_exit(elo_exit);