2 * Penmount serial touchscreen driver
4 * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
6 * Based on ELO driver (drivers/input/touchscreen/elo.c)
7 * Copyright (c) 2004 Vojtech Pavlik
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
13 * by the Free Software Foundation.
16 #include <linux/errno.h>
17 #include <linux/kernel.h>
18 #include <linux/module.h>
19 #include <linux/slab.h>
20 #include <linux/input.h>
21 #include <linux/serio.h>
22 #include <linux/init.h>
24 #define DRIVER_DESC "Penmount serial touchscreen driver"
26 MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
27 MODULE_DESCRIPTION(DRIVER_DESC);
28 MODULE_LICENSE("GPL");
31 * Definitions & global arrays.
34 #define PM_MAX_LENGTH 5
37 * Per-touchscreen data.
41 struct input_dev *dev;
44 unsigned char data[PM_MAX_LENGTH];
48 static irqreturn_t pm_interrupt(struct serio *serio,
49 unsigned char data, unsigned int flags)
51 struct pm *pm = serio_get_drvdata(serio);
52 struct input_dev *dev = pm->dev;
54 pm->data[pm->idx] = data;
56 if (pm->data[0] & 0x80) {
57 if (PM_MAX_LENGTH == ++pm->idx) {
58 input_report_abs(dev, ABS_X, pm->data[2] * 128 + pm->data[1]);
59 input_report_abs(dev, ABS_Y, pm->data[4] * 128 + pm->data[3]);
60 input_report_key(dev, BTN_TOUCH, !!(pm->data[0] & 0x40));
70 * pm_disconnect() is the opposite of pm_connect()
73 static void pm_disconnect(struct serio *serio)
75 struct pm *pm = serio_get_drvdata(serio);
77 input_get_device(pm->dev);
78 input_unregister_device(pm->dev);
80 serio_set_drvdata(serio, NULL);
81 input_put_device(pm->dev);
86 * pm_connect() is the routine that is called when someone adds a
87 * new serio device that supports Gunze protocol and registers it as
91 static int pm_connect(struct serio *serio, struct serio_driver *drv)
94 struct input_dev *input_dev;
97 pm = kzalloc(sizeof(struct pm), GFP_KERNEL);
98 input_dev = input_allocate_device();
99 if (!pm || !input_dev) {
106 snprintf(pm->phys, sizeof(pm->phys), "%s/input0", serio->phys);
108 input_dev->private = pm;
109 input_dev->name = "Penmount Serial TouchScreen";
110 input_dev->phys = pm->phys;
111 input_dev->id.bustype = BUS_RS232;
112 input_dev->id.vendor = SERIO_PENMOUNT;
113 input_dev->id.product = 0;
114 input_dev->id.version = 0x0100;
115 input_dev->cdev.dev = &serio->dev;
117 input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS);
118 input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH);
119 input_set_abs_params(pm->dev, ABS_X, 0, 0x3ff, 0, 0);
120 input_set_abs_params(pm->dev, ABS_Y, 0, 0x3ff, 0, 0);
122 serio_set_drvdata(serio, pm);
124 err = serio_open(serio, drv);
128 err = input_register_device(pm->dev);
134 fail3: serio_close(serio);
135 fail2: serio_set_drvdata(serio, NULL);
136 fail1: input_free_device(input_dev);
142 * The serio driver structure.
145 static struct serio_device_id pm_serio_ids[] = {
148 .proto = SERIO_PENMOUNT,
155 MODULE_DEVICE_TABLE(serio, pm_serio_ids);
157 static struct serio_driver pm_drv = {
159 .name = "penmountlpc",
161 .description = DRIVER_DESC,
162 .id_table = pm_serio_ids,
163 .interrupt = pm_interrupt,
164 .connect = pm_connect,
165 .disconnect = pm_disconnect,
169 * The functions for inserting/removing us as a module.
172 static int __init pm_init(void)
174 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);