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 5
39 * Per-touchscreen data.
43 struct input_dev *dev;
46 unsigned char data[PM_MAX_LENGTH];
50 static irqreturn_t pm_interrupt(struct serio *serio,
51 unsigned char data, unsigned int flags)
53 struct pm *pm = serio_get_drvdata(serio);
54 struct input_dev *dev = pm->dev;
56 pm->data[pm->idx] = data;
58 if (pm->data[0] & 0x80) {
59 if (PM_MAX_LENGTH == ++pm->idx) {
60 input_report_abs(dev, ABS_X, pm->data[1] * 128 + pm->data[2]);
61 input_report_abs(dev, ABS_Y, pm->data[3] * 128 + pm->data[4]);
62 input_report_key(dev, BTN_TOUCH, !!(pm->data[0] & 0x40));
72 * pm_disconnect() is the opposite of pm_connect()
75 static void pm_disconnect(struct serio *serio)
77 struct pm *pm = serio_get_drvdata(serio);
79 input_get_device(pm->dev);
80 input_unregister_device(pm->dev);
82 serio_set_drvdata(serio, NULL);
83 input_put_device(pm->dev);
88 * pm_connect() is the routine that is called when someone adds a
89 * new serio device that supports PenMount protocol and registers it as
93 static int pm_connect(struct serio *serio, struct serio_driver *drv)
96 struct input_dev *input_dev;
99 pm = kzalloc(sizeof(struct pm), GFP_KERNEL);
100 input_dev = input_allocate_device();
101 if (!pm || !input_dev) {
108 snprintf(pm->phys, sizeof(pm->phys), "%s/input0", serio->phys);
110 input_dev->name = "PenMount Serial TouchScreen";
111 input_dev->phys = pm->phys;
112 input_dev->id.bustype = BUS_RS232;
113 input_dev->id.vendor = SERIO_PENMOUNT;
114 input_dev->id.product = 0;
115 input_dev->id.version = 0x0100;
116 input_dev->dev.parent = &serio->dev;
118 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
119 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
120 input_set_abs_params(pm->dev, ABS_X, 0, 0x3ff, 0, 0);
121 input_set_abs_params(pm->dev, ABS_Y, 0, 0x3ff, 0, 0);
123 serio_set_drvdata(serio, pm);
125 err = serio_open(serio, drv);
129 err = input_register_device(pm->dev);
135 fail3: serio_close(serio);
136 fail2: serio_set_drvdata(serio, NULL);
137 fail1: input_free_device(input_dev);
143 * The serio driver structure.
146 static struct serio_device_id pm_serio_ids[] = {
149 .proto = SERIO_PENMOUNT,
156 MODULE_DEVICE_TABLE(serio, pm_serio_ids);
158 static struct serio_driver pm_drv = {
160 .name = "serio-penmount",
162 .description = DRIVER_DESC,
163 .id_table = pm_serio_ids,
164 .interrupt = pm_interrupt,
165 .connect = pm_connect,
166 .disconnect = pm_disconnect,
170 * The functions for inserting/removing us as a module.
173 static int __init pm_init(void)
175 return serio_register_driver(&pm_drv);
178 static void __exit pm_exit(void)
180 serio_unregister_driver(&pm_drv);
183 module_init(pm_init);
184 module_exit(pm_exit);