[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

#define ELO10_LEAD_BYTE		'U'

#define ELO10_TOUCH_PACKET	'T'

/*
 * 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->data[elo->idx] = data;
	switch (elo->idx++) {
		case 0:
			elo->csum = 0xaa;
			if (data != ELO10_LEAD_BYTE) {
				pr_debug("elo: unsynchronized data: 0x%02x\n", data);
				elo->idx = 0;
			}
			break;

		case 9:
			elo->idx = 0;
			if (data != elo->csum) {
				pr_debug("elo: bad checksum: 0x%02x, expected 0x%02x\n",
					 data, elo->csum);
				break;
			}
			if (elo->data[1] != ELO10_TOUCH_PACKET) {
				pr_debug(elo: "unexpected packet: 0x%02x\n", elo->data[1]);
				break;
			}
			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);
			break;
	}
	elo->csum += data;
}

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_get_device(elo->dev);
	input_unregister_device(elo->dev);
	serio_close(serio);
	serio_set_drvdata(serio, NULL);
	input_put_device(elo->dev);
	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 fail1;
	}

	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 fail2;

	err = input_register_device(elo->dev);
	if (err)
		goto fail3;

	return 0;

 fail3: serio_close(serio);
 fail2:	serio_set_drvdata(serio, NULL);
 fail1:	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
1ce316ef SJ	37	#define ELO_MAX_LENGTH 10
	38
	39	#define ELO10_LEAD_BYTE 'U'
	40
	41	#define ELO10_TOUCH_PACKET 'T'
1da177e4	42
1da177e4 LT	43	/*
	44	* Per-touchscreen data.
	45	*/
	46
	47	struct elo {
eca1ed19	48	struct input_dev *dev;
1da177e4 LT	49	struct serio *serio;
	50	int id;
	51	int idx;
	52	unsigned char csum;
	53	unsigned char data[ELO_MAX_LENGTH];
	54	char phys[32];
	55	};
	56
1ce316ef	57	static void elo_process_data_10(struct elo elo, unsigned char data, struct pt_regs regs)
1da177e4	58	{
eca1ed19	59	struct input_dev *dev = elo->dev;
1da177e4	60
1ce316ef	61	elo->data[elo->idx] = data;
1da177e4	62	switch (elo->idx++) {
1da177e4	63	case 0:
1ce316ef SJ	64	elo->csum = 0xaa;
	65	if (data != ELO10_LEAD_BYTE) {
	66	pr_debug("elo: unsynchronized data: 0x%02x\n", data);
1da177e4	67	elo->idx = 0;
1da177e4 LT	68	}
	69	break;
	70
	71	case 9:
1da177e4	72	elo->idx = 0;
1ce316ef SJ	73	if (data != elo->csum) {
	74	pr_debug("elo: bad checksum: 0x%02x, expected 0x%02x\n",
	75	data, elo->csum);
	76	break;
	77	}
	78	if (elo->data[1] != ELO10_TOUCH_PACKET) {
	79	pr_debug(elo: "unexpected packet: 0x%02x\n", elo->data[1]);
	80	break;
	81	}
	82	input_regs(dev, regs);
	83	input_report_abs(dev, ABS_X, (elo->data[4] << 8) \| elo->data[3]);
	84	input_report_abs(dev, ABS_Y, (elo->data[6] << 8) \| elo->data[5]);
	85	input_report_abs(dev, ABS_PRESSURE, (elo->data[8] << 8) \| elo->data[7]);
	86	input_report_key(dev, BTN_TOUCH, elo->data[8] \|\| elo->data[7]);
	87	input_sync(dev);
1da177e4 LT	88	break;
1da177e4 LT	89	}
1ce316ef	90	elo->csum += data;
1da177e4 LT	91	}
1da177e4 LT	92
1ce316ef	93	static void elo_process_data_6(struct elo elo, unsigned char data, struct pt_regs regs)
1da177e4	94	{
eca1ed19	95	struct input_dev *dev = elo->dev;
1da177e4 LT	96
	97	elo->data[elo->idx] = data;
	98
	99	switch (elo->idx++) {
	100
	101	case 0: if ((data & 0xc0) != 0xc0) elo->idx = 0; break;
	102	case 1: if ((data & 0xc0) != 0x80) elo->idx = 0; break;
	103	case 2: if ((data & 0xc0) != 0x40) elo->idx = 0; break;
	104
	105	case 3:
	106	if (data & 0xc0) {
	107	elo->idx = 0;
	108	break;
	109	}
	110
	111	input_regs(dev, regs);
	112	input_report_abs(dev, ABS_X, ((elo->data[0] & 0x3f) << 6) \| (elo->data[1] & 0x3f));
	113	input_report_abs(dev, ABS_Y, ((elo->data[2] & 0x3f) << 6) \| (elo->data[3] & 0x3f));
	114
	115	if (elo->id == 2) {
	116	input_report_key(dev, BTN_TOUCH, 1);
	117	input_sync(dev);
	118	elo->idx = 0;
	119	}
	120
	121	break;
	122
	123	case 4:
	124	if (data) {
	125	input_sync(dev);
	126	elo->idx = 0;
	127	}
	128	break;
	129
	130	case 5:
	131	if ((data & 0xf0) == 0) {
	132	input_report_abs(dev, ABS_PRESSURE, elo->data[5]);
eca1ed19	133	input_report_key(dev, BTN_TOUCH, !!elo->data[5]);
1da177e4 LT	134	}
	135	input_sync(dev);
	136	elo->idx = 0;
	137	break;
	138	}
	139	}
	140
1ce316ef	141	static void elo_process_data_3(struct elo elo, unsigned char data, struct pt_regs regs)
1da177e4	142	{
eca1ed19	143	struct input_dev *dev = elo->dev;
1da177e4 LT	144
	145	elo->data[elo->idx] = data;
	146
	147	switch (elo->idx++) {
	148
	149	case 0:
	150	if ((data & 0x7f) != 0x01)
	151	elo->idx = 0;
	152	break;
	153	case 2:
	154	input_regs(dev, regs);
	155	input_report_key(dev, BTN_TOUCH, !(elo->data[1] & 0x80));
	156	input_report_abs(dev, ABS_X, elo->data[1]);
	157	input_report_abs(dev, ABS_Y, elo->data[2]);
	158	input_sync(dev);
	159	elo->idx = 0;
	160	break;
	161	}
	162	}
	163
	164	static irqreturn_t elo_interrupt(struct serio *serio,
	165	unsigned char data, unsigned int flags, struct pt_regs *regs)
	166	{
1ce316ef	167	struct elo *elo = serio_get_drvdata(serio);
1da177e4 LT	168
	169	switch(elo->id) {
	170	case 0:
	171	elo_process_data_10(elo, data, regs);
	172	break;
	173
	174	case 1:
	175	case 2:
	176	elo_process_data_6(elo, data, regs);
	177	break;
	178
	179	case 3:
	180	elo_process_data_3(elo, data, regs);
	181	break;
	182	}
	183
	184	return IRQ_HANDLED;
	185	}
	186
	187	/*
	188	* elo_disconnect() is the opposite of elo_connect()
	189	*/
	190
	191	static void elo_disconnect(struct serio *serio)
	192	{
6b50d8b8	193	struct elo *elo = serio_get_drvdata(serio);
1da177e4	194
6b50d8b8	195	input_get_device(elo->dev);
eca1ed19	196	input_unregister_device(elo->dev);
1da177e4 LT	197	serio_close(serio);
1da177e4 LT	198	serio_set_drvdata(serio, NULL);
6b50d8b8	199	input_put_device(elo->dev);
1da177e4 LT	200	kfree(elo);
	201	}
	202
	203	/*
	204	* elo_connect() is the routine that is called when someone adds a
	205	* new serio device that supports Gunze protocol and registers it as
	206	* an input device.
	207	*/
	208
	209	static int elo_connect(struct serio serio, struct serio_driver drv)
	210	{
	211	struct elo *elo;
eca1ed19	212	struct input_dev *input_dev;
1da177e4 LT	213	int err;
1da177e4 LT	214
eca1ed19 DT	215	elo = kzalloc(sizeof(struct elo), GFP_KERNEL);
	216	input_dev = input_allocate_device();
	217	if (!elo \|\| !input_dev) {
	218	err = -ENOMEM;
6b50d8b8	219	goto fail1;
eca1ed19	220	}
1da177e4	221
eca1ed19 DT	222	elo->serio = serio;
	223	elo->id = serio->id.id;
	224	elo->dev = input_dev;
	225	snprintf(elo->phys, sizeof(elo->phys), "%s/input0", serio->phys);
1da177e4	226
eca1ed19 DT	227	input_dev->private = elo;
	228	input_dev->name = "Elo Serial TouchScreen";
	229	input_dev->phys = elo->phys;
	230	input_dev->id.bustype = BUS_RS232;
	231	input_dev->id.vendor = SERIO_ELO;
	232	input_dev->id.product = elo->id;
	233	input_dev->id.version = 0x0100;
	234	input_dev->cdev.dev = &serio->dev;
1da177e4	235
eca1ed19 DT	236	input_dev->evbit[0] = BIT(EV_KEY) \| BIT(EV_ABS);
eca1ed19 DT	237	input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
1da177e4 LT	238
	239	switch (elo->id) {
	240
	241	case 0: /* 10-byte protocol */
eca1ed19 DT	242	input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
	243	input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
	244	input_set_abs_params(input_dev, ABS_PRESSURE, 0, 255, 0, 0);
1da177e4	245	break;
de1b963a	246
1da177e4	247	case 1: /* 6-byte protocol */
eca1ed19	248	input_set_abs_params(input_dev, ABS_PRESSURE, 0, 15, 0, 0);
1da177e4 LT	249
1da177e4 LT	250	case 2: /* 4-byte protocol */
eca1ed19 DT	251	input_set_abs_params(input_dev, ABS_X, 96, 4000, 0, 0);
eca1ed19 DT	252	input_set_abs_params(input_dev, ABS_Y, 96, 4000, 0, 0);
1da177e4 LT	253	break;
	254
	255	case 3: /* 3-byte protocol */
eca1ed19 DT	256	input_set_abs_params(input_dev, ABS_X, 0, 255, 0, 0);
eca1ed19 DT	257	input_set_abs_params(input_dev, ABS_Y, 0, 255, 0, 0);
1da177e4 LT	258	break;
	259	}
	260
1da177e4 LT	261	serio_set_drvdata(serio, elo);
	262
	263	err = serio_open(serio, drv);
eca1ed19	264	if (err)
6b50d8b8 DT	265	goto fail2;
	266
	267	err = input_register_device(elo->dev);
	268	if (err)
	269	goto fail3;
1da177e4 LT	270
1da177e4 LT	271	return 0;
eca1ed19	272
6b50d8b8 DT	273	fail3: serio_close(serio);
	274	fail2: serio_set_drvdata(serio, NULL);
	275	fail1: input_free_device(input_dev);
eca1ed19 DT	276	kfree(elo);
eca1ed19 DT	277	return err;
1da177e4 LT	278	}
	279
	280	/*
	281	* The serio driver structure.
	282	*/
	283
	284	static struct serio_device_id elo_serio_ids[] = {
	285	{
	286	.type = SERIO_RS232,
	287	.proto = SERIO_ELO,
	288	.id = SERIO_ANY,
	289	.extra = SERIO_ANY,
	290	},
	291	{ 0 }
	292	};
	293
	294	MODULE_DEVICE_TABLE(serio, elo_serio_ids);
	295
	296	static struct serio_driver elo_drv = {
	297	.driver = {
	298	.name = "elo",
	299	},
	300	.description = DRIVER_DESC,
	301	.id_table = elo_serio_ids,
	302	.interrupt = elo_interrupt,
	303	.connect = elo_connect,
	304	.disconnect = elo_disconnect,
	305	};
	306
	307	/*
	308	* The functions for inserting/removing us as a module.
	309	*/
	310
	311	static int __init elo_init(void)
	312	{
	313	serio_register_driver(&elo_drv);
	314	return 0;
	315	}
	316
	317	static void __exit elo_exit(void)
	318	{
	319	serio_unregister_driver(&elo_drv);
	320	}
	321
	322	module_init(elo_init);
	323	module_exit(elo_exit);