2 * Penmount serial touchscreen driver
4 * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
5 * Copyright (c) 2011 John Sung <penmount.touch@gmail.com>
7 * Based on ELO driver (drivers/input/touchscreen/elo.c)
8 * Copyright (c) 2004 Vojtech Pavlik
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.
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>
22 #include <linux/serio.h>
23 #include <linux/init.h>
25 #define DRIVER_DESC "PenMount serial touchscreen driver"
27 MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
28 MODULE_AUTHOR("John Sung <penmount.touch@gmail.com>");
29 MODULE_DESCRIPTION(DRIVER_DESC);
30 MODULE_LICENSE("GPL");
33 * Definitions & global arrays.
36 #define PM_MAX_LENGTH 6
39 * Per-touchscreen data.
43 struct input_dev *dev;
46 unsigned char data[PM_MAX_LENGTH];
48 unsigned char packetsize;
52 * pm_checkpacket() checks if data packet is valid
55 static bool pm_checkpacket(unsigned char *packet)
60 for (i = 0; i < 5; i++)
63 return packet[5] == (unsigned char)~(total & 0xff);
66 static irqreturn_t pm_interrupt(struct serio *serio,
67 unsigned char data, unsigned int flags)
69 struct pm *pm = serio_get_drvdata(serio);
70 struct input_dev *dev = pm->dev;
72 pm->data[pm->idx] = data;
74 switch (pm->dev->id.product) {
76 if (pm->data[0] & 0x80) {
77 if (pm->packetsize == ++pm->idx) {
78 input_report_abs(dev, ABS_X, pm->data[1] * 128 + pm->data[2]);
79 input_report_abs(dev, ABS_Y, pm->data[3] * 128 + pm->data[4]);
80 input_report_key(dev, BTN_TOUCH, !!(pm->data[0] & 0x40));
88 if ((pm->data[0] & 0xbf) == 0x30) {
89 if (pm->packetsize == ++pm->idx) {
90 if (pm_checkpacket(pm->data)) {
91 input_report_abs(dev, ABS_X,
92 pm->data[2] * 256 + pm->data[1]);
93 input_report_abs(dev, ABS_Y,
94 pm->data[4] * 256 + pm->data[3]);
95 input_report_key(dev, BTN_TOUCH, !!(pm->data[0] & 0x40));
108 * pm_disconnect() is the opposite of pm_connect()
111 static void pm_disconnect(struct serio *serio)
113 struct pm *pm = serio_get_drvdata(serio);
115 input_get_device(pm->dev);
116 input_unregister_device(pm->dev);
118 serio_set_drvdata(serio, NULL);
119 input_put_device(pm->dev);
124 * pm_connect() is the routine that is called when someone adds a
125 * new serio device that supports PenMount protocol and registers it as
129 static int pm_connect(struct serio *serio, struct serio_driver *drv)
132 struct input_dev *input_dev;
135 pm = kzalloc(sizeof(struct pm), GFP_KERNEL);
136 input_dev = input_allocate_device();
137 if (!pm || !input_dev) {
144 snprintf(pm->phys, sizeof(pm->phys), "%s/input0", serio->phys);
146 input_dev->name = "PenMount Serial TouchScreen";
147 input_dev->phys = pm->phys;
148 input_dev->id.bustype = BUS_RS232;
149 input_dev->id.vendor = SERIO_PENMOUNT;
150 input_dev->id.product = 0;
151 input_dev->id.version = 0x0100;
152 input_dev->dev.parent = &serio->dev;
154 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
155 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
156 input_set_abs_params(pm->dev, ABS_X, 0, 0x3ff, 0, 0);
157 input_set_abs_params(pm->dev, ABS_Y, 0, 0x3ff, 0, 0);
159 switch (serio->id.id) {
163 input_dev->id.product = 0x9000;
168 input_dev->id.product = 0x6000;
172 serio_set_drvdata(serio, pm);
174 err = serio_open(serio, drv);
178 err = input_register_device(pm->dev);
184 fail3: serio_close(serio);
185 fail2: serio_set_drvdata(serio, NULL);
186 fail1: input_free_device(input_dev);
192 * The serio driver structure.
195 static struct serio_device_id pm_serio_ids[] = {
198 .proto = SERIO_PENMOUNT,
205 MODULE_DEVICE_TABLE(serio, pm_serio_ids);
207 static struct serio_driver pm_drv = {
209 .name = "serio-penmount",
211 .description = DRIVER_DESC,
212 .id_table = pm_serio_ids,
213 .interrupt = pm_interrupt,
214 .connect = pm_connect,
215 .disconnect = pm_disconnect,
219 * The functions for inserting/removing us as a module.
222 static int __init pm_init(void)
224 return serio_register_driver(&pm_drv);
227 static void __exit pm_exit(void)
229 serio_unregister_driver(&pm_drv);
232 module_init(pm_init);
233 module_exit(pm_exit);