[linux-2.6-block.git] / drivers / input / touchscreen / penmount.c

/*
 * Penmount serial touchscreen driver
 *
 * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
 * Copyright (c) 2011 John Sung <penmount.touch@gmail.com>
 *
 * Based on ELO driver (drivers/input/touchscreen/elo.c)
 * 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.
 */

#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/serio.h>

#define DRIVER_DESC	"PenMount serial touchscreen driver"

MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
MODULE_AUTHOR("John Sung <penmount.touch@gmail.com>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

/*
 * Definitions & global arrays.
 */

#define	PM_MAX_LENGTH	6
#define	PM_MAX_MTSLOT	16
#define	PM_3000_MTSLOT	2
#define	PM_6250_MTSLOT	12

/*
 * Multi-touch slot
 */

struct mt_slot {
	unsigned short x, y;
	bool active; /* is the touch valid? */
};

/*
 * Per-touchscreen data.
 */

struct pm {
	struct input_dev *dev;
	struct serio *serio;
	int idx;
	unsigned char data[PM_MAX_LENGTH];
	char phys[32];
	unsigned char packetsize;
	unsigned char maxcontacts;
	struct mt_slot slots[PM_MAX_MTSLOT];
	void (*parse_packet)(struct pm *);
};

/*
 * pm_mtevent() sends mt events and also emulates pointer movement
 */

static void pm_mtevent(struct pm *pm, struct input_dev *input)
{
	int i;

	for (i = 0; i < pm->maxcontacts; ++i) {
		input_mt_slot(input, i);
		input_mt_report_slot_state(input, MT_TOOL_FINGER,
				pm->slots[i].active);
		if (pm->slots[i].active) {
			input_event(input, EV_ABS, ABS_MT_POSITION_X, pm->slots[i].x);
			input_event(input, EV_ABS, ABS_MT_POSITION_Y, pm->slots[i].y);
		}
	}

	input_mt_report_pointer_emulation(input, true);
	input_sync(input);
}

/*
 * pm_checkpacket() checks if data packet is valid
 */

static bool pm_checkpacket(unsigned char *packet)
{
	int total = 0;
	int i;

	for (i = 0; i < 5; i++)
		total += packet[i];

	return packet[5] == (unsigned char)~(total & 0xff);
}

static void pm_parse_9000(struct pm *pm)
{
	struct input_dev *dev = pm->dev;

	if ((pm->data[0] & 0x80) && pm->packetsize == ++pm->idx) {
		input_report_abs(dev, ABS_X, pm->data[1] * 128 + pm->data[2]);
		input_report_abs(dev, ABS_Y, pm->data[3] * 128 + pm->data[4]);
		input_report_key(dev, BTN_TOUCH, !!(pm->data[0] & 0x40));
		input_sync(dev);
		pm->idx = 0;
	}
}

static void pm_parse_6000(struct pm *pm)
{
	struct input_dev *dev = pm->dev;

	if ((pm->data[0] & 0xbf) == 0x30 && pm->packetsize == ++pm->idx) {
		if (pm_checkpacket(pm->data)) {
			input_report_abs(dev, ABS_X,
					pm->data[2] * 256 + pm->data[1]);
			input_report_abs(dev, ABS_Y,
					pm->data[4] * 256 + pm->data[3]);
			input_report_key(dev, BTN_TOUCH, pm->data[0] & 0x40);
			input_sync(dev);
		}
		pm->idx = 0;
	}
}

static void pm_parse_3000(struct pm *pm)
{
	struct input_dev *dev = pm->dev;

	if ((pm->data[0] & 0xce) == 0x40 && pm->packetsize == ++pm->idx) {
		if (pm_checkpacket(pm->data)) {
			int slotnum = pm->data[0] & 0x0f;
			pm->slots[slotnum].active = pm->data[0] & 0x30;
			pm->slots[slotnum].x = pm->data[2] * 256 + pm->data[1];
			pm->slots[slotnum].y = pm->data[4] * 256 + pm->data[3];
			pm_mtevent(pm, dev);
		}
		pm->idx = 0;
	}
}

static void pm_parse_6250(struct pm *pm)
{
	struct input_dev *dev = pm->dev;

	if ((pm->data[0] & 0xb0) == 0x30 && pm->packetsize == ++pm->idx) {
		if (pm_checkpacket(pm->data)) {
			int slotnum = pm->data[0] & 0x0f;
			pm->slots[slotnum].active = pm->data[0] & 0x40;
			pm->slots[slotnum].x = pm->data[2] * 256 + pm->data[1];
			pm->slots[slotnum].y = pm->data[4] * 256 + pm->data[3];
			pm_mtevent(pm, dev);
		}
		pm->idx = 0;
	}
}

static irqreturn_t pm_interrupt(struct serio *serio,
		unsigned char data, unsigned int flags)
{
	struct pm *pm = serio_get_drvdata(serio);

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

	pm->parse_packet(pm);

	return IRQ_HANDLED;
}

/*
 * pm_disconnect() is the opposite of pm_connect()
 */

static void pm_disconnect(struct serio *serio)
{
	struct pm *pm = serio_get_drvdata(serio);

	serio_close(serio);

	input_unregister_device(pm->dev);
	kfree(pm);

	serio_set_drvdata(serio, NULL);
}

/*
 * pm_connect() is the routine that is called when someone adds a
 * new serio device that supports PenMount protocol and registers it as
 * an input device.
 */

static int pm_connect(struct serio *serio, struct serio_driver *drv)
{
	struct pm *pm;
	struct input_dev *input_dev;
	int max_x, max_y;
	int err;

	pm = kzalloc(sizeof(struct pm), GFP_KERNEL);
	input_dev = input_allocate_device();
	if (!pm || !input_dev) {
		err = -ENOMEM;
		goto fail1;
	}

	pm->serio = serio;
	pm->dev = input_dev;
	snprintf(pm->phys, sizeof(pm->phys), "%s/input0", serio->phys);
	pm->maxcontacts = 1;

	input_dev->name = "PenMount Serial TouchScreen";
	input_dev->phys = pm->phys;
	input_dev->id.bustype = BUS_RS232;
	input_dev->id.vendor = SERIO_PENMOUNT;
	input_dev->id.product = 0;
	input_dev->id.version = 0x0100;
	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);

	switch (serio->id.id) {
	default:
	case 0:
		pm->packetsize = 5;
		pm->parse_packet = pm_parse_9000;
		input_dev->id.product = 0x9000;
		max_x = max_y = 0x3ff;
		break;

	case 1:
		pm->packetsize = 6;
		pm->parse_packet = pm_parse_6000;
		input_dev->id.product = 0x6000;
		max_x = max_y = 0x3ff;
		break;

	case 2:
		pm->packetsize = 6;
		pm->parse_packet = pm_parse_3000;
		input_dev->id.product = 0x3000;
		max_x = max_y = 0x7ff;
		pm->maxcontacts = PM_3000_MTSLOT;
		break;

	case 3:
		pm->packetsize = 6;
		pm->parse_packet = pm_parse_6250;
		input_dev->id.product = 0x6250;
		max_x = max_y = 0x3ff;
		pm->maxcontacts = PM_6250_MTSLOT;
		break;
	}

	input_set_abs_params(pm->dev, ABS_X, 0, max_x, 0, 0);
	input_set_abs_params(pm->dev, ABS_Y, 0, max_y, 0, 0);

	if (pm->maxcontacts > 1) {
		input_mt_init_slots(pm->dev, pm->maxcontacts, 0);
		input_set_abs_params(pm->dev,
				     ABS_MT_POSITION_X, 0, max_x, 0, 0);
		input_set_abs_params(pm->dev,
				     ABS_MT_POSITION_Y, 0, max_y, 0, 0);
	}

	serio_set_drvdata(serio, pm);

	err = serio_open(serio, drv);
	if (err)
		goto fail2;

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

	return 0;

 fail3:	serio_close(serio);
 fail2:	serio_set_drvdata(serio, NULL);
 fail1:	input_free_device(input_dev);
	kfree(pm);
	return err;
}

/*
 * The serio driver structure.
 */

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

MODULE_DEVICE_TABLE(serio, pm_serio_ids);

static struct serio_driver pm_drv = {
	.driver		= {
		.name	= "serio-penmount",
	},
	.description	= DRIVER_DESC,
	.id_table	= pm_serio_ids,
	.interrupt	= pm_interrupt,
	.connect	= pm_connect,
	.disconnect	= pm_disconnect,
};

module_serio_driver(pm_drv);
Commit	Line	Data
ee479999 RK	1	/*
	2	* Penmount serial touchscreen driver
	3	*
	4	* Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
21ae508b	5	* Copyright (c) 2011 John Sung <penmount.touch@gmail.com>
ee479999 RK	6	*
	7	* Based on ELO driver (drivers/input/touchscreen/elo.c)
	8	* Copyright (c) 2004 Vojtech Pavlik
	9	*/
	10
	11	/*
	12	* This program is free software; you can redistribute it and/or modify it
	13	* under the terms of the GNU General Public License version 2 as published
	14	* by the Free Software Foundation.
	15	*/
	16
	17	#include <linux/errno.h>
	18	#include <linux/kernel.h>
	19	#include <linux/module.h>
	20	#include <linux/slab.h>
	21	#include <linux/input.h>
90aba7d8	22	#include <linux/input/mt.h>
ee479999	23	#include <linux/serio.h>
ee479999	24
21ae508b	25	#define DRIVER_DESC "PenMount serial touchscreen driver"
ee479999 RK	26
ee479999 RK	27	MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
21ae508b	28	MODULE_AUTHOR("John Sung <penmount.touch@gmail.com>");
ee479999 RK	29	MODULE_DESCRIPTION(DRIVER_DESC);
	30	MODULE_LICENSE("GPL");
	31
	32	/*
	33	* Definitions & global arrays.
	34	*/
	35
c42e2e40	36	#define PM_MAX_LENGTH 6
90aba7d8 JS	37	#define PM_MAX_MTSLOT 16
90aba7d8 JS	38	#define PM_3000_MTSLOT 2
bd8f6d2e	39	#define PM_6250_MTSLOT 12
90aba7d8 JS	40
	41	/*
	42	* Multi-touch slot
	43	*/
	44
	45	struct mt_slot {
	46	unsigned short x, y;
	47	bool active; /* is the touch valid? */
	48	};
ee479999 RK	49
	50	/*
	51	* Per-touchscreen data.
	52	*/
	53
	54	struct pm {
	55	struct input_dev *dev;
	56	struct serio *serio;
	57	int idx;
	58	unsigned char data[PM_MAX_LENGTH];
	59	char phys[32];
c42e2e40	60	unsigned char packetsize;
90aba7d8 JS	61	unsigned char maxcontacts;
90aba7d8 JS	62	struct mt_slot slots[PM_MAX_MTSLOT];
98b013eb	63	void (parse_packet)(struct pm );
ee479999 RK	64	};
ee479999 RK	65
90aba7d8 JS	66	/*
	67	* pm_mtevent() sends mt events and also emulates pointer movement
	68	*/
	69
	70	static void pm_mtevent(struct pm pm, struct input_dev input)
	71	{
	72	int i;
	73
	74	for (i = 0; i < pm->maxcontacts; ++i) {
	75	input_mt_slot(input, i);
	76	input_mt_report_slot_state(input, MT_TOOL_FINGER,
	77	pm->slots[i].active);
	78	if (pm->slots[i].active) {
	79	input_event(input, EV_ABS, ABS_MT_POSITION_X, pm->slots[i].x);
	80	input_event(input, EV_ABS, ABS_MT_POSITION_Y, pm->slots[i].y);
	81	}
	82	}
	83
	84	input_mt_report_pointer_emulation(input, true);
	85	input_sync(input);
	86	}
	87
c42e2e40 JS	88	/*
	89	* pm_checkpacket() checks if data packet is valid
	90	*/
	91
	92	static bool pm_checkpacket(unsigned char *packet)
	93	{
	94	int total = 0;
	95	int i;
	96
	97	for (i = 0; i < 5; i++)
	98	total += packet[i];
	99
	100	return packet[5] == (unsigned char)~(total & 0xff);
	101	}
	102
98b013eb	103	static void pm_parse_9000(struct pm *pm)
ee479999	104	{
ee479999 RK	105	struct input_dev *dev = pm->dev;
ee479999 RK	106
98b013eb DT	107	if ((pm->data[0] & 0x80) && pm->packetsize == ++pm->idx) {
	108	input_report_abs(dev, ABS_X, pm->data[1] * 128 + pm->data[2]);
	109	input_report_abs(dev, ABS_Y, pm->data[3] * 128 + pm->data[4]);
	110	input_report_key(dev, BTN_TOUCH, !!(pm->data[0] & 0x40));
	111	input_sync(dev);
	112	pm->idx = 0;
	113	}
	114	}
ee479999	115
98b013eb DT	116	static void pm_parse_6000(struct pm *pm)
	117	{
	118	struct input_dev *dev = pm->dev;
c42e2e40	119
98b013eb DT	120	if ((pm->data[0] & 0xbf) == 0x30 && pm->packetsize == ++pm->idx) {
	121	if (pm_checkpacket(pm->data)) {
	122	input_report_abs(dev, ABS_X,
	123	pm->data[2] * 256 + pm->data[1]);
	124	input_report_abs(dev, ABS_Y,
	125	pm->data[4] * 256 + pm->data[3]);
	126	input_report_key(dev, BTN_TOUCH, pm->data[0] & 0x40);
	127	input_sync(dev);
ee479999	128	}
98b013eb DT	129	pm->idx = 0;
	130	}
	131	}
	132
	133	static void pm_parse_3000(struct pm *pm)
	134	{
	135	struct input_dev *dev = pm->dev;
90aba7d8	136
98b013eb DT	137	if ((pm->data[0] & 0xce) == 0x40 && pm->packetsize == ++pm->idx) {
	138	if (pm_checkpacket(pm->data)) {
	139	int slotnum = pm->data[0] & 0x0f;
	140	pm->slots[slotnum].active = pm->data[0] & 0x30;
	141	pm->slots[slotnum].x = pm->data[2] * 256 + pm->data[1];
	142	pm->slots[slotnum].y = pm->data[4] * 256 + pm->data[3];
	143	pm_mtevent(pm, dev);
90aba7d8	144	}
98b013eb DT	145	pm->idx = 0;
	146	}
	147	}
	148
	149	static void pm_parse_6250(struct pm *pm)
	150	{
	151	struct input_dev *dev = pm->dev;
bd8f6d2e	152
98b013eb DT	153	if ((pm->data[0] & 0xb0) == 0x30 && pm->packetsize == ++pm->idx) {
	154	if (pm_checkpacket(pm->data)) {
	155	int slotnum = pm->data[0] & 0x0f;
	156	pm->slots[slotnum].active = pm->data[0] & 0x40;
	157	pm->slots[slotnum].x = pm->data[2] * 256 + pm->data[1];
	158	pm->slots[slotnum].y = pm->data[4] * 256 + pm->data[3];
	159	pm_mtevent(pm, dev);
bd8f6d2e	160	}
98b013eb	161	pm->idx = 0;
ee479999	162	}
98b013eb DT	163	}
	164
	165	static irqreturn_t pm_interrupt(struct serio *serio,
	166	unsigned char data, unsigned int flags)
	167	{
	168	struct pm *pm = serio_get_drvdata(serio);
	169
	170	pm->data[pm->idx] = data;
	171
	172	pm->parse_packet(pm);
ee479999 RK	173
	174	return IRQ_HANDLED;
	175	}
	176
	177	/*
	178	* pm_disconnect() is the opposite of pm_connect()
	179	*/
	180
	181	static void pm_disconnect(struct serio *serio)
	182	{
	183	struct pm *pm = serio_get_drvdata(serio);
	184
ee479999	185	serio_close(serio);
c3a01ba9 DT	186
c3a01ba9 DT	187	input_unregister_device(pm->dev);
ee479999	188	kfree(pm);
c3a01ba9 DT	189
c3a01ba9 DT	190	serio_set_drvdata(serio, NULL);
ee479999 RK	191	}
	192
	193	/*
	194	* pm_connect() is the routine that is called when someone adds a
21ae508b	195	* new serio device that supports PenMount protocol and registers it as
ee479999 RK	196	* an input device.
	197	*/
	198
	199	static int pm_connect(struct serio serio, struct serio_driver drv)
	200	{
	201	struct pm *pm;
	202	struct input_dev *input_dev;
90aba7d8	203	int max_x, max_y;
ee479999 RK	204	int err;
	205
	206	pm = kzalloc(sizeof(struct pm), GFP_KERNEL);
	207	input_dev = input_allocate_device();
	208	if (!pm \|\| !input_dev) {
	209	err = -ENOMEM;
	210	goto fail1;
	211	}
	212
	213	pm->serio = serio;
	214	pm->dev = input_dev;
	215	snprintf(pm->phys, sizeof(pm->phys), "%s/input0", serio->phys);
90aba7d8	216	pm->maxcontacts = 1;
ee479999	217
21ae508b	218	input_dev->name = "PenMount Serial TouchScreen";
ee479999 RK	219	input_dev->phys = pm->phys;
	220	input_dev->id.bustype = BUS_RS232;
	221	input_dev->id.vendor = SERIO_PENMOUNT;
	222	input_dev->id.product = 0;
	223	input_dev->id.version = 0x0100;
a5394fb0	224	input_dev->dev.parent = &serio->dev;
ee479999	225
90aba7d8 JS	226	input_dev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_ABS);
90aba7d8 JS	227	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
c42e2e40 JS	228
	229	switch (serio->id.id) {
	230	default:
	231	case 0:
	232	pm->packetsize = 5;
98b013eb	233	pm->parse_packet = pm_parse_9000;
c42e2e40	234	input_dev->id.product = 0x9000;
90aba7d8	235	max_x = max_y = 0x3ff;
c42e2e40 JS	236	break;
	237
	238	case 1:
	239	pm->packetsize = 6;
98b013eb	240	pm->parse_packet = pm_parse_6000;
c42e2e40	241	input_dev->id.product = 0x6000;
90aba7d8 JS	242	max_x = max_y = 0x3ff;
	243	break;
	244
	245	case 2:
	246	pm->packetsize = 6;
98b013eb	247	pm->parse_packet = pm_parse_3000;
90aba7d8 JS	248	input_dev->id.product = 0x3000;
	249	max_x = max_y = 0x7ff;
	250	pm->maxcontacts = PM_3000_MTSLOT;
c42e2e40	251	break;
bd8f6d2e JS	252
	253	case 3:
	254	pm->packetsize = 6;
98b013eb	255	pm->parse_packet = pm_parse_6250;
bd8f6d2e JS	256	input_dev->id.product = 0x6250;
	257	max_x = max_y = 0x3ff;
	258	pm->maxcontacts = PM_6250_MTSLOT;
	259	break;
c42e2e40	260	}
90aba7d8 JS	261
	262	input_set_abs_params(pm->dev, ABS_X, 0, max_x, 0, 0);
	263	input_set_abs_params(pm->dev, ABS_Y, 0, max_y, 0, 0);
	264
	265	if (pm->maxcontacts > 1) {
b4adbbef	266	input_mt_init_slots(pm->dev, pm->maxcontacts, 0);
90aba7d8 JS	267	input_set_abs_params(pm->dev,
	268	ABS_MT_POSITION_X, 0, max_x, 0, 0);
	269	input_set_abs_params(pm->dev,
	270	ABS_MT_POSITION_Y, 0, max_y, 0, 0);
	271	}
ee479999 RK	272
	273	serio_set_drvdata(serio, pm);
	274
	275	err = serio_open(serio, drv);
	276	if (err)
	277	goto fail2;
	278
	279	err = input_register_device(pm->dev);
	280	if (err)
	281	goto fail3;
	282
	283	return 0;
	284
	285	fail3: serio_close(serio);
	286	fail2: serio_set_drvdata(serio, NULL);
	287	fail1: input_free_device(input_dev);
	288	kfree(pm);
	289	return err;
	290	}
	291
	292	/*
	293	* The serio driver structure.
	294	*/
	295
	296	static struct serio_device_id pm_serio_ids[] = {
	297	{
	298	.type = SERIO_RS232,
	299	.proto = SERIO_PENMOUNT,
	300	.id = SERIO_ANY,
	301	.extra = SERIO_ANY,
	302	},
	303	{ 0 }
	304	};
	305
	306	MODULE_DEVICE_TABLE(serio, pm_serio_ids);
	307
	308	static struct serio_driver pm_drv = {
	309	.driver = {
21ae508b	310	.name = "serio-penmount",
ee479999 RK	311	},
	312	.description = DRIVER_DESC,
	313	.id_table = pm_serio_ids,
	314	.interrupt = pm_interrupt,
	315	.connect = pm_connect,
	316	.disconnect = pm_disconnect,
	317	};
	318
65ac9f7a	319	module_serio_driver(pm_drv);