2 * Dynapro serial touchscreen driver
4 * Copyright (c) 2009 Tias Guns
5 * Based on the inexio driver (c) Vojtech Pavlik and Dan Streetman and
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License version 2 as published by
13 * the Free Software Foundation.
18 * Copied inexio.c and edited for Dynapro protocol (from retired Xorg module)
21 #include <linux/errno.h>
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/slab.h>
25 #include <linux/input.h>
26 #include <linux/serio.h>
27 #include <linux/init.h>
29 #define DRIVER_DESC "Dynapro serial touchscreen driver"
32 MODULE_DESCRIPTION(DRIVER_DESC);
33 MODULE_LICENSE("GPL");
36 * Definitions & global arrays.
39 #define DYNAPRO_FORMAT_TOUCH_BIT 0x40
40 #define DYNAPRO_FORMAT_LENGTH 3
41 #define DYNAPRO_RESPONSE_BEGIN_BYTE 0x80
43 #define DYNAPRO_MIN_XC 0
44 #define DYNAPRO_MAX_XC 0x3ff
45 #define DYNAPRO_MIN_YC 0
46 #define DYNAPRO_MAX_YC 0x3ff
48 #define DYNAPRO_GET_XC(data) (data[1] | ((data[0] & 0x38) << 4))
49 #define DYNAPRO_GET_YC(data) (data[2] | ((data[0] & 0x07) << 7))
50 #define DYNAPRO_GET_TOUCHED(data) (DYNAPRO_FORMAT_TOUCH_BIT & data[0])
53 * Per-touchscreen data.
57 struct input_dev *dev;
60 unsigned char data[DYNAPRO_FORMAT_LENGTH];
64 static void dynapro_process_data(struct dynapro *pdynapro)
66 struct input_dev *dev = pdynapro->dev;
68 if (DYNAPRO_FORMAT_LENGTH == ++pdynapro->idx) {
69 input_report_abs(dev, ABS_X, DYNAPRO_GET_XC(pdynapro->data));
70 input_report_abs(dev, ABS_Y, DYNAPRO_GET_YC(pdynapro->data));
71 input_report_key(dev, BTN_TOUCH,
72 DYNAPRO_GET_TOUCHED(pdynapro->data));
79 static irqreturn_t dynapro_interrupt(struct serio *serio,
80 unsigned char data, unsigned int flags)
82 struct dynapro *pdynapro = serio_get_drvdata(serio);
84 pdynapro->data[pdynapro->idx] = data;
86 if (DYNAPRO_RESPONSE_BEGIN_BYTE & pdynapro->data[0])
87 dynapro_process_data(pdynapro);
89 dev_dbg(&serio->dev, "unknown/unsynchronized data: %x\n",
95 static void dynapro_disconnect(struct serio *serio)
97 struct dynapro *pdynapro = serio_get_drvdata(serio);
99 input_get_device(pdynapro->dev);
100 input_unregister_device(pdynapro->dev);
102 serio_set_drvdata(serio, NULL);
103 input_put_device(pdynapro->dev);
108 * dynapro_connect() is the routine that is called when someone adds a
109 * new serio device that supports dynapro protocol and registers it as
110 * an input device. This is usually accomplished using inputattach.
113 static int dynapro_connect(struct serio *serio, struct serio_driver *drv)
115 struct dynapro *pdynapro;
116 struct input_dev *input_dev;
119 pdynapro = kzalloc(sizeof(struct dynapro), GFP_KERNEL);
120 input_dev = input_allocate_device();
121 if (!pdynapro || !input_dev) {
126 pdynapro->serio = serio;
127 pdynapro->dev = input_dev;
128 snprintf(pdynapro->phys, sizeof(pdynapro->phys),
129 "%s/input0", serio->phys);
131 input_dev->name = "Dynapro Serial TouchScreen";
132 input_dev->phys = pdynapro->phys;
133 input_dev->id.bustype = BUS_RS232;
134 input_dev->id.vendor = SERIO_DYNAPRO;
135 input_dev->id.product = 0;
136 input_dev->id.version = 0x0001;
137 input_dev->dev.parent = &serio->dev;
138 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
139 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
140 input_set_abs_params(pdynapro->dev, ABS_X,
141 DYNAPRO_MIN_XC, DYNAPRO_MAX_XC, 0, 0);
142 input_set_abs_params(pdynapro->dev, ABS_Y,
143 DYNAPRO_MIN_YC, DYNAPRO_MAX_YC, 0, 0);
145 serio_set_drvdata(serio, pdynapro);
147 err = serio_open(serio, drv);
151 err = input_register_device(pdynapro->dev);
157 fail3: serio_close(serio);
158 fail2: serio_set_drvdata(serio, NULL);
159 fail1: input_free_device(input_dev);
165 * The serio driver structure.
168 static struct serio_device_id dynapro_serio_ids[] = {
171 .proto = SERIO_DYNAPRO,
178 MODULE_DEVICE_TABLE(serio, dynapro_serio_ids);
180 static struct serio_driver dynapro_drv = {
184 .description = DRIVER_DESC,
185 .id_table = dynapro_serio_ids,
186 .interrupt = dynapro_interrupt,
187 .connect = dynapro_connect,
188 .disconnect = dynapro_disconnect,
191 module_serio_driver(dynapro_drv);