[mirror_ubuntu-bionic-kernel.git] / drivers / input / touchscreen / hampshire.c

/*
 * Hampshire serial touchscreen driver
 *
 * Copyright (c) 2010 Adam Bennett
 * Based on the dynapro driver (c) Tias Guns
 *
 */

/*
 * 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.
 */

/*
 * 2010/04/08 Adam Bennett <abennett72@gmail.com>
 *   Copied dynapro.c and edited for Hampshire 4-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>

#define DRIVER_DESC	"Hampshire serial touchscreen driver"

MODULE_AUTHOR("Adam Bennett <abennett72@gmail.com>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

/*
 * Definitions & global arrays.
 */

#define HAMPSHIRE_FORMAT_TOUCH_BIT 0x40
#define HAMPSHIRE_FORMAT_LENGTH 4
#define HAMPSHIRE_RESPONSE_BEGIN_BYTE 0x80

#define HAMPSHIRE_MIN_XC 0
#define HAMPSHIRE_MAX_XC 0x1000
#define HAMPSHIRE_MIN_YC 0
#define HAMPSHIRE_MAX_YC 0x1000

#define HAMPSHIRE_GET_XC(data) (((data[3] & 0x0c) >> 2) | (data[1] << 2) | ((data[0] & 0x38) << 6))
#define HAMPSHIRE_GET_YC(data) ((data[3] & 0x03) | (data[2] << 2) | ((data[0] & 0x07) << 9))
#define HAMPSHIRE_GET_TOUCHED(data) (HAMPSHIRE_FORMAT_TOUCH_BIT & data[0])

/*
 * Per-touchscreen data.
 */

struct hampshire {
	struct input_dev *dev;
	struct serio *serio;
	int idx;
	unsigned char data[HAMPSHIRE_FORMAT_LENGTH];
	char phys[32];
};

static void hampshire_process_data(struct hampshire *phampshire)
{
	struct input_dev *dev = phampshire->dev;

	if (HAMPSHIRE_FORMAT_LENGTH == ++phampshire->idx) {
		input_report_abs(dev, ABS_X, HAMPSHIRE_GET_XC(phampshire->data));
		input_report_abs(dev, ABS_Y, HAMPSHIRE_GET_YC(phampshire->data));
		input_report_key(dev, BTN_TOUCH,
				 HAMPSHIRE_GET_TOUCHED(phampshire->data));
		input_sync(dev);

		phampshire->idx = 0;
	}
}

static irqreturn_t hampshire_interrupt(struct serio *serio,
		unsigned char data, unsigned int flags)
{
	struct hampshire *phampshire = serio_get_drvdata(serio);

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

	if (HAMPSHIRE_RESPONSE_BEGIN_BYTE & phampshire->data[0])
		hampshire_process_data(phampshire);
	else
		dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n",
			phampshire->data[0]);

	return IRQ_HANDLED;
}

static void hampshire_disconnect(struct serio *serio)
{
	struct hampshire *phampshire = serio_get_drvdata(serio);

	input_get_device(phampshire->dev);
	input_unregister_device(phampshire->dev);
	serio_close(serio);
	serio_set_drvdata(serio, NULL);
	input_put_device(phampshire->dev);
	kfree(phampshire);
}

/*
 * hampshire_connect() is the routine that is called when someone adds a
 * new serio device that supports hampshire protocol and registers it as
 * an input device. This is usually accomplished using inputattach.
 */

static int hampshire_connect(struct serio *serio, struct serio_driver *drv)
{
	struct hampshire *phampshire;
	struct input_dev *input_dev;
	int err;

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

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

	input_dev->name = "Hampshire Serial TouchScreen";
	input_dev->phys = phampshire->phys;
	input_dev->id.bustype = BUS_RS232;
	input_dev->id.vendor = SERIO_HAMPSHIRE;
	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(phampshire->dev, ABS_X,
			     HAMPSHIRE_MIN_XC, HAMPSHIRE_MAX_XC, 0, 0);
	input_set_abs_params(phampshire->dev, ABS_Y,
			     HAMPSHIRE_MIN_YC, HAMPSHIRE_MAX_YC, 0, 0);

	serio_set_drvdata(serio, phampshire);

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

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

	return 0;

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

/*
 * The serio driver structure.
 */

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

MODULE_DEVICE_TABLE(serio, hampshire_serio_ids);

static struct serio_driver hampshire_drv = {
	.driver		= {
		.name	= "hampshire",
	},
	.description	= DRIVER_DESC,
	.id_table	= hampshire_serio_ids,
	.interrupt	= hampshire_interrupt,
	.connect	= hampshire_connect,
	.disconnect	= hampshire_disconnect,
};

module_serio_driver(hampshire_drv);
Commit	Line	Data
422dee56 AB	1	/*
	2	* Hampshire serial touchscreen driver
	3	*
	4	* Copyright (c) 2010 Adam Bennett
	5	* Based on the dynapro driver (c) Tias Guns
	6	*
	7	*/
	8
	9	/*
	10	* This program is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License version 2 as published by
	12	* the Free Software Foundation.
	13	*/
	14
	15	/*
	16	* 2010/04/08 Adam Bennett <abennett72@gmail.com>
	17	* Copied dynapro.c and edited for Hampshire 4-byte protocol
	18	*/
	19
	20	#include <linux/errno.h>
	21	#include <linux/kernel.h>
	22	#include <linux/module.h>
	23	#include <linux/slab.h>
	24	#include <linux/input.h>
	25	#include <linux/serio.h>
422dee56 AB	26
	27	#define DRIVER_DESC "Hampshire serial touchscreen driver"
	28
	29	MODULE_AUTHOR("Adam Bennett <abennett72@gmail.com>");
	30	MODULE_DESCRIPTION(DRIVER_DESC);
	31	MODULE_LICENSE("GPL");
	32
	33	/*
	34	* Definitions & global arrays.
	35	*/
	36
	37	#define HAMPSHIRE_FORMAT_TOUCH_BIT 0x40
	38	#define HAMPSHIRE_FORMAT_LENGTH 4
	39	#define HAMPSHIRE_RESPONSE_BEGIN_BYTE 0x80
	40
	41	#define HAMPSHIRE_MIN_XC 0
	42	#define HAMPSHIRE_MAX_XC 0x1000
	43	#define HAMPSHIRE_MIN_YC 0
	44	#define HAMPSHIRE_MAX_YC 0x1000
	45
	46	#define HAMPSHIRE_GET_XC(data) (((data[3] & 0x0c) >> 2) \| (data[1] << 2) \| ((data[0] & 0x38) << 6))
	47	#define HAMPSHIRE_GET_YC(data) ((data[3] & 0x03) \| (data[2] << 2) \| ((data[0] & 0x07) << 9))
	48	#define HAMPSHIRE_GET_TOUCHED(data) (HAMPSHIRE_FORMAT_TOUCH_BIT & data[0])
	49
	50	/*
	51	* Per-touchscreen data.
	52	*/
	53
	54	struct hampshire {
	55	struct input_dev *dev;
	56	struct serio *serio;
	57	int idx;
	58	unsigned char data[HAMPSHIRE_FORMAT_LENGTH];
	59	char phys[32];
	60	};
	61
	62	static void hampshire_process_data(struct hampshire *phampshire)
	63	{
	64	struct input_dev *dev = phampshire->dev;
	65
	66	if (HAMPSHIRE_FORMAT_LENGTH == ++phampshire->idx) {
	67	input_report_abs(dev, ABS_X, HAMPSHIRE_GET_XC(phampshire->data));
	68	input_report_abs(dev, ABS_Y, HAMPSHIRE_GET_YC(phampshire->data));
	69	input_report_key(dev, BTN_TOUCH,
	70	HAMPSHIRE_GET_TOUCHED(phampshire->data));
	71	input_sync(dev);
	72
	73	phampshire->idx = 0;
	74	}
	75	}
	76
	77	static irqreturn_t hampshire_interrupt(struct serio *serio,
	78	unsigned char data, unsigned int flags)
	79	{
	80	struct hampshire *phampshire = serio_get_drvdata(serio);
	81
	82	phampshire->data[phampshire->idx] = data;
	83
	84	if (HAMPSHIRE_RESPONSE_BEGIN_BYTE & phampshire->data[0])
	85	hampshire_process_data(phampshire);
	86	else
	87	dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n",
	88	phampshire->data[0]);
	89
90	return IRQ_HANDLED;
91	}
92
93	static void hampshire_disconnect(struct serio *serio)
94	{
95	struct hampshire *phampshire = serio_get_drvdata(serio);
96
97	input_get_device(phampshire->dev);
98	input_unregister_device(phampshire->dev);
99	serio_close(serio);
100	serio_set_drvdata(serio, NULL);
101	input_put_device(phampshire->dev);
102	kfree(phampshire);
103	}
104
105	/*
106	* hampshire_connect() is the routine that is called when someone adds a
107	* new serio device that supports hampshire protocol and registers it as
108	* an input device. This is usually accomplished using inputattach.
109	*/
110
111	static int hampshire_connect(struct serio serio, struct serio_driver drv)
112	{
113	struct hampshire *phampshire;
114	struct input_dev *input_dev;
115	int err;
116
117	phampshire = kzalloc(sizeof(struct hampshire), GFP_KERNEL);
118	input_dev = input_allocate_device();
119	if (!phampshire \|\| !input_dev) {
120	err = -ENOMEM;
121	goto fail1;
122	}
123
124	phampshire->serio = serio;
125	phampshire->dev = input_dev;
126	snprintf(phampshire->phys, sizeof(phampshire->phys),
127	"%s/input0", serio->phys);
128
129	input_dev->name = "Hampshire Serial TouchScreen";
130	input_dev->phys = phampshire->phys;
131	input_dev->id.bustype = BUS_RS232;
132	input_dev->id.vendor = SERIO_HAMPSHIRE;
133	input_dev->id.product = 0;
134	input_dev->id.version = 0x0001;
135	input_dev->dev.parent = &serio->dev;
136	input_dev->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_ABS);
137	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
138	input_set_abs_params(phampshire->dev, ABS_X,
139	HAMPSHIRE_MIN_XC, HAMPSHIRE_MAX_XC, 0, 0);
140	input_set_abs_params(phampshire->dev, ABS_Y,
141	HAMPSHIRE_MIN_YC, HAMPSHIRE_MAX_YC, 0, 0);
142
143	serio_set_drvdata(serio, phampshire);
144
145	err = serio_open(serio, drv);
146	if (err)
147	goto fail2;
148
149	err = input_register_device(phampshire->dev);
150	if (err)
151	goto fail3;
152
153	return 0;
154
155	fail3: serio_close(serio);
156	fail2: serio_set_drvdata(serio, NULL);
157	fail1: input_free_device(input_dev);
158	kfree(phampshire);
159	return err;
160	}
161
162	/*
163	* The serio driver structure.
164	*/
165
166	static struct serio_device_id hampshire_serio_ids[] = {
167	{
168	.type = SERIO_RS232,
169	.proto = SERIO_HAMPSHIRE,
170	.id = SERIO_ANY,
171	.extra = SERIO_ANY,
172	},
173	{ 0 }
174	};
175
176	MODULE_DEVICE_TABLE(serio, hampshire_serio_ids);
177
178	static struct serio_driver hampshire_drv = {
179	.driver = {
180	.name = "hampshire",
181	},
182	.description = DRIVER_DESC,
183	.id_table = hampshire_serio_ids,
184	.interrupt = hampshire_interrupt,
185	.connect = hampshire_connect,
186	.disconnect = hampshire_disconnect,
187	};
188
65ac9f7a	189	module_serio_driver(hampshire_drv);