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/drivers/input/touchscreen/inexio.c

https://bitbucket.org/ndreys/linux-sunxi
C | 207 lines | 130 code | 40 blank | 37 comment | 7 complexity | ea273490a93d38220cb7f541dd25bdc4 MD5 | raw file
Possible License(s): GPL-2.0, LGPL-2.0, AGPL-1.0
  1/*
  2 * iNexio serial touchscreen driver
  3 *
  4 * Copyright (c) 2008 Richard Lemon
  5 * Based on the mtouch driver (c) Vojtech Pavlik and Dan Streetman
  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 * 2008/06/19 Richard Lemon <richard@codelemon.com>
 17 *   Copied mtouch.c and edited for iNexio 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>
 26#include <linux/init.h>
 27
 28#define DRIVER_DESC	"iNexio serial touchscreen driver"
 29
 30MODULE_AUTHOR("Richard Lemon <richard@codelemon.com>");
 31MODULE_DESCRIPTION(DRIVER_DESC);
 32MODULE_LICENSE("GPL");
 33
 34/*
 35 * Definitions & global arrays.
 36 */
 37
 38#define INEXIO_FORMAT_TOUCH_BIT 0x01
 39#define INEXIO_FORMAT_LENGTH 5
 40#define INEXIO_RESPONSE_BEGIN_BYTE 0x80
 41
 42/* todo: check specs for max length of all responses */
 43#define INEXIO_MAX_LENGTH 16
 44
 45#define INEXIO_MIN_XC 0
 46#define INEXIO_MAX_XC 0x3fff
 47#define INEXIO_MIN_YC 0
 48#define INEXIO_MAX_YC 0x3fff
 49
 50#define INEXIO_GET_XC(data) (((data[1])<<7) | data[2])
 51#define INEXIO_GET_YC(data) (((data[3])<<7) | data[4])
 52#define INEXIO_GET_TOUCHED(data) (INEXIO_FORMAT_TOUCH_BIT & data[0])
 53
 54/*
 55 * Per-touchscreen data.
 56 */
 57
 58struct inexio {
 59	struct input_dev *dev;
 60	struct serio *serio;
 61	int idx;
 62	unsigned char data[INEXIO_MAX_LENGTH];
 63	char phys[32];
 64};
 65
 66static void inexio_process_data(struct inexio *pinexio)
 67{
 68	struct input_dev *dev = pinexio->dev;
 69
 70	if (INEXIO_FORMAT_LENGTH == ++pinexio->idx) {
 71		input_report_abs(dev, ABS_X, INEXIO_GET_XC(pinexio->data));
 72		input_report_abs(dev, ABS_Y, INEXIO_GET_YC(pinexio->data));
 73		input_report_key(dev, BTN_TOUCH, INEXIO_GET_TOUCHED(pinexio->data));
 74		input_sync(dev);
 75
 76		pinexio->idx = 0;
 77	}
 78}
 79
 80static irqreturn_t inexio_interrupt(struct serio *serio,
 81		unsigned char data, unsigned int flags)
 82{
 83	struct inexio* pinexio = serio_get_drvdata(serio);
 84
 85	pinexio->data[pinexio->idx] = data;
 86
 87	if (INEXIO_RESPONSE_BEGIN_BYTE&pinexio->data[0])
 88		inexio_process_data(pinexio);
 89	else
 90		printk(KERN_DEBUG "inexio.c: unknown/unsynchronized data from device, byte %x\n",pinexio->data[0]);
 91
 92	return IRQ_HANDLED;
 93}
 94
 95/*
 96 * inexio_disconnect() is the opposite of inexio_connect()
 97 */
 98
 99static void inexio_disconnect(struct serio *serio)
100{
101	struct inexio* pinexio = serio_get_drvdata(serio);
102
103	input_get_device(pinexio->dev);
104	input_unregister_device(pinexio->dev);
105	serio_close(serio);
106	serio_set_drvdata(serio, NULL);
107	input_put_device(pinexio->dev);
108	kfree(pinexio);
109}
110
111/*
112 * inexio_connect() is the routine that is called when someone adds a
113 * new serio device that supports iNexio protocol and registers it as
114 * an input device. This is usually accomplished using inputattach.
115 */
116
117static int inexio_connect(struct serio *serio, struct serio_driver *drv)
118{
119	struct inexio *pinexio;
120	struct input_dev *input_dev;
121	int err;
122
123	pinexio = kzalloc(sizeof(struct inexio), GFP_KERNEL);
124	input_dev = input_allocate_device();
125	if (!pinexio || !input_dev) {
126		err = -ENOMEM;
127		goto fail1;
128	}
129
130	pinexio->serio = serio;
131	pinexio->dev = input_dev;
132	snprintf(pinexio->phys, sizeof(pinexio->phys), "%s/input0", serio->phys);
133
134	input_dev->name = "iNexio Serial TouchScreen";
135	input_dev->phys = pinexio->phys;
136	input_dev->id.bustype = BUS_RS232;
137	input_dev->id.vendor = SERIO_INEXIO;
138	input_dev->id.product = 0;
139	input_dev->id.version = 0x0001;
140	input_dev->dev.parent = &serio->dev;
141	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
142	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
143	input_set_abs_params(pinexio->dev, ABS_X, INEXIO_MIN_XC, INEXIO_MAX_XC, 0, 0);
144	input_set_abs_params(pinexio->dev, ABS_Y, INEXIO_MIN_YC, INEXIO_MAX_YC, 0, 0);
145
146	serio_set_drvdata(serio, pinexio);
147
148	err = serio_open(serio, drv);
149	if (err)
150		goto fail2;
151
152	err = input_register_device(pinexio->dev);
153	if (err)
154		goto fail3;
155
156	return 0;
157
158 fail3:	serio_close(serio);
159 fail2:	serio_set_drvdata(serio, NULL);
160 fail1:	input_free_device(input_dev);
161	kfree(pinexio);
162	return err;
163}
164
165/*
166 * The serio driver structure.
167 */
168
169static struct serio_device_id inexio_serio_ids[] = {
170	{
171		.type	= SERIO_RS232,
172		.proto	= SERIO_INEXIO,
173		.id	= SERIO_ANY,
174		.extra	= SERIO_ANY,
175	},
176	{ 0 }
177};
178
179MODULE_DEVICE_TABLE(serio, inexio_serio_ids);
180
181static struct serio_driver inexio_drv = {
182	.driver		= {
183		.name	= "inexio",
184	},
185	.description	= DRIVER_DESC,
186	.id_table	= inexio_serio_ids,
187	.interrupt	= inexio_interrupt,
188	.connect	= inexio_connect,
189	.disconnect	= inexio_disconnect,
190};
191
192/*
193 * The functions for inserting/removing us as a module.
194 */
195
196static int __init inexio_init(void)
197{
198	return serio_register_driver(&inexio_drv);
199}
200
201static void __exit inexio_exit(void)
202{
203	serio_unregister_driver(&inexio_drv);
204}
205
206module_init(inexio_init);
207module_exit(inexio_exit);