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/drivers/input/touchscreen/inexio.c

http://github.com/mirrors/linux
C | 186 lines | 120 code | 37 blank | 29 comment | 7 complexity | 6de1a9b2e93fafd32d3d97f8499be9c6 MD5 | raw file
  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * iNexio serial touchscreen driver
  4 *
  5 * Copyright (c) 2008 Richard Lemon
  6 * Based on the mtouch driver (c) Vojtech Pavlik and Dan Streetman
  7 */
  8
  9
 10/*
 11 * 2008/06/19 Richard Lemon <richard@codelemon.com>
 12 *   Copied mtouch.c and edited for iNexio protocol
 13 */
 14
 15#include <linux/errno.h>
 16#include <linux/kernel.h>
 17#include <linux/module.h>
 18#include <linux/slab.h>
 19#include <linux/input.h>
 20#include <linux/serio.h>
 21
 22#define DRIVER_DESC	"iNexio serial touchscreen driver"
 23
 24MODULE_AUTHOR("Richard Lemon <richard@codelemon.com>");
 25MODULE_DESCRIPTION(DRIVER_DESC);
 26MODULE_LICENSE("GPL");
 27
 28/*
 29 * Definitions & global arrays.
 30 */
 31
 32#define INEXIO_FORMAT_TOUCH_BIT 0x01
 33#define INEXIO_FORMAT_LENGTH 5
 34#define INEXIO_RESPONSE_BEGIN_BYTE 0x80
 35
 36/* todo: check specs for max length of all responses */
 37#define INEXIO_MAX_LENGTH 16
 38
 39#define INEXIO_MIN_XC 0
 40#define INEXIO_MAX_XC 0x3fff
 41#define INEXIO_MIN_YC 0
 42#define INEXIO_MAX_YC 0x3fff
 43
 44#define INEXIO_GET_XC(data) (((data[1])<<7) | data[2])
 45#define INEXIO_GET_YC(data) (((data[3])<<7) | data[4])
 46#define INEXIO_GET_TOUCHED(data) (INEXIO_FORMAT_TOUCH_BIT & data[0])
 47
 48/*
 49 * Per-touchscreen data.
 50 */
 51
 52struct inexio {
 53	struct input_dev *dev;
 54	struct serio *serio;
 55	int idx;
 56	unsigned char data[INEXIO_MAX_LENGTH];
 57	char phys[32];
 58};
 59
 60static void inexio_process_data(struct inexio *pinexio)
 61{
 62	struct input_dev *dev = pinexio->dev;
 63
 64	if (INEXIO_FORMAT_LENGTH == ++pinexio->idx) {
 65		input_report_abs(dev, ABS_X, INEXIO_GET_XC(pinexio->data));
 66		input_report_abs(dev, ABS_Y, INEXIO_GET_YC(pinexio->data));
 67		input_report_key(dev, BTN_TOUCH, INEXIO_GET_TOUCHED(pinexio->data));
 68		input_sync(dev);
 69
 70		pinexio->idx = 0;
 71	}
 72}
 73
 74static irqreturn_t inexio_interrupt(struct serio *serio,
 75		unsigned char data, unsigned int flags)
 76{
 77	struct inexio *pinexio = serio_get_drvdata(serio);
 78
 79	pinexio->data[pinexio->idx] = data;
 80
 81	if (INEXIO_RESPONSE_BEGIN_BYTE&pinexio->data[0])
 82		inexio_process_data(pinexio);
 83	else
 84		printk(KERN_DEBUG "inexio.c: unknown/unsynchronized data from device, byte %x\n",pinexio->data[0]);
 85
 86	return IRQ_HANDLED;
 87}
 88
 89/*
 90 * inexio_disconnect() is the opposite of inexio_connect()
 91 */
 92
 93static void inexio_disconnect(struct serio *serio)
 94{
 95	struct inexio *pinexio = serio_get_drvdata(serio);
 96
 97	input_get_device(pinexio->dev);
 98	input_unregister_device(pinexio->dev);
 99	serio_close(serio);
100	serio_set_drvdata(serio, NULL);
101	input_put_device(pinexio->dev);
102	kfree(pinexio);
103}
104
105/*
106 * inexio_connect() is the routine that is called when someone adds a
107 * new serio device that supports iNexio protocol and registers it as
108 * an input device. This is usually accomplished using inputattach.
109 */
110
111static int inexio_connect(struct serio *serio, struct serio_driver *drv)
112{
113	struct inexio *pinexio;
114	struct input_dev *input_dev;
115	int err;
116
117	pinexio = kzalloc(sizeof(struct inexio), GFP_KERNEL);
118	input_dev = input_allocate_device();
119	if (!pinexio || !input_dev) {
120		err = -ENOMEM;
121		goto fail1;
122	}
123
124	pinexio->serio = serio;
125	pinexio->dev = input_dev;
126	snprintf(pinexio->phys, sizeof(pinexio->phys), "%s/input0", serio->phys);
127
128	input_dev->name = "iNexio Serial TouchScreen";
129	input_dev->phys = pinexio->phys;
130	input_dev->id.bustype = BUS_RS232;
131	input_dev->id.vendor = SERIO_INEXIO;
132	input_dev->id.product = 0;
133	input_dev->id.version = 0x0001;
134	input_dev->dev.parent = &serio->dev;
135	input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
136	input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
137	input_set_abs_params(pinexio->dev, ABS_X, INEXIO_MIN_XC, INEXIO_MAX_XC, 0, 0);
138	input_set_abs_params(pinexio->dev, ABS_Y, INEXIO_MIN_YC, INEXIO_MAX_YC, 0, 0);
139
140	serio_set_drvdata(serio, pinexio);
141
142	err = serio_open(serio, drv);
143	if (err)
144		goto fail2;
145
146	err = input_register_device(pinexio->dev);
147	if (err)
148		goto fail3;
149
150	return 0;
151
152 fail3:	serio_close(serio);
153 fail2:	serio_set_drvdata(serio, NULL);
154 fail1:	input_free_device(input_dev);
155	kfree(pinexio);
156	return err;
157}
158
159/*
160 * The serio driver structure.
161 */
162
163static const struct serio_device_id inexio_serio_ids[] = {
164	{
165		.type	= SERIO_RS232,
166		.proto	= SERIO_INEXIO,
167		.id	= SERIO_ANY,
168		.extra	= SERIO_ANY,
169	},
170	{ 0 }
171};
172
173MODULE_DEVICE_TABLE(serio, inexio_serio_ids);
174
175static struct serio_driver inexio_drv = {
176	.driver		= {
177		.name	= "inexio",
178	},
179	.description	= DRIVER_DESC,
180	.id_table	= inexio_serio_ids,
181	.interrupt	= inexio_interrupt,
182	.connect	= inexio_connect,
183	.disconnect	= inexio_disconnect,
184};
185
186module_serio_driver(inexio_drv);