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Linux/drivers/input/touchscreen/touchwin.c

  1 /*
  2  * Touchwindow serial touchscreen driver
  3  *
  4  * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com>
  5  *
  6  * Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c)
  7  * Copyright (c) 2004 Vojtech Pavlik
  8  * and Dan Streetman <ddstreet@ieee.org>
  9  */
 10 
 11 /*
 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.
 15  */
 16 
 17 /*
 18  * 2005/02/19 Rick Koch:
 19  *   The Touchwindow I used is made by Edmark Corp. and
 20  *   constantly outputs a stream of 0's unless it is touched.
 21  *   It then outputs 3 bytes: X, Y, and a copy of Y.
 22  */
 23 
 24 #include <linux/errno.h>
 25 #include <linux/kernel.h>
 26 #include <linux/module.h>
 27 #include <linux/slab.h>
 28 #include <linux/input.h>
 29 #include <linux/serio.h>
 30 
 31 #define DRIVER_DESC     "Touchwindow serial touchscreen driver"
 32 
 33 MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
 34 MODULE_DESCRIPTION(DRIVER_DESC);
 35 MODULE_LICENSE("GPL");
 36 
 37 /*
 38  * Definitions & global arrays.
 39  */
 40 
 41 #define TW_LENGTH 3
 42 
 43 #define TW_MIN_XC 0
 44 #define TW_MAX_XC 0xff
 45 #define TW_MIN_YC 0
 46 #define TW_MAX_YC 0xff
 47 
 48 /*
 49  * Per-touchscreen data.
 50  */
 51 
 52 struct tw {
 53         struct input_dev *dev;
 54         struct serio *serio;
 55         int idx;
 56         int touched;
 57         unsigned char data[TW_LENGTH];
 58         char phys[32];
 59 };
 60 
 61 static irqreturn_t tw_interrupt(struct serio *serio,
 62                 unsigned char data, unsigned int flags)
 63 {
 64         struct tw *tw = serio_get_drvdata(serio);
 65         struct input_dev *dev = tw->dev;
 66 
 67         if (data) {             /* touch */
 68                 tw->touched = 1;
 69                 tw->data[tw->idx++] = data;
 70                 /* verify length and that the two Y's are the same */
 71                 if (tw->idx == TW_LENGTH && tw->data[1] == tw->data[2]) {
 72                         input_report_abs(dev, ABS_X, tw->data[0]);
 73                         input_report_abs(dev, ABS_Y, tw->data[1]);
 74                         input_report_key(dev, BTN_TOUCH, 1);
 75                         input_sync(dev);
 76                         tw->idx = 0;
 77                 }
 78         } else if (tw->touched) {       /* untouch */
 79                 input_report_key(dev, BTN_TOUCH, 0);
 80                 input_sync(dev);
 81                 tw->idx = 0;
 82                 tw->touched = 0;
 83         }
 84 
 85         return IRQ_HANDLED;
 86 }
 87 
 88 /*
 89  * tw_disconnect() is the opposite of tw_connect()
 90  */
 91 
 92 static void tw_disconnect(struct serio *serio)
 93 {
 94         struct tw *tw = serio_get_drvdata(serio);
 95 
 96         input_get_device(tw->dev);
 97         input_unregister_device(tw->dev);
 98         serio_close(serio);
 99         serio_set_drvdata(serio, NULL);
100         input_put_device(tw->dev);
101         kfree(tw);
102 }
103 
104 /*
105  * tw_connect() is the routine that is called when someone adds a
106  * new serio device that supports the Touchwin protocol and registers it as
107  * an input device.
108  */
109 
110 static int tw_connect(struct serio *serio, struct serio_driver *drv)
111 {
112         struct tw *tw;
113         struct input_dev *input_dev;
114         int err;
115 
116         tw = kzalloc(sizeof(struct tw), GFP_KERNEL);
117         input_dev = input_allocate_device();
118         if (!tw || !input_dev) {
119                 err = -ENOMEM;
120                 goto fail1;
121         }
122 
123         tw->serio = serio;
124         tw->dev = input_dev;
125         snprintf(tw->phys, sizeof(tw->phys), "%s/input0", serio->phys);
126 
127         input_dev->name = "Touchwindow Serial TouchScreen";
128         input_dev->phys = tw->phys;
129         input_dev->id.bustype = BUS_RS232;
130         input_dev->id.vendor = SERIO_TOUCHWIN;
131         input_dev->id.product = 0;
132         input_dev->id.version = 0x0100;
133         input_dev->dev.parent = &serio->dev;
134         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
135         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
136         input_set_abs_params(tw->dev, ABS_X, TW_MIN_XC, TW_MAX_XC, 0, 0);
137         input_set_abs_params(tw->dev, ABS_Y, TW_MIN_YC, TW_MAX_YC, 0, 0);
138 
139         serio_set_drvdata(serio, tw);
140 
141         err = serio_open(serio, drv);
142         if (err)
143                 goto fail2;
144 
145         err = input_register_device(tw->dev);
146         if (err)
147                 goto fail3;
148 
149         return 0;
150 
151  fail3: serio_close(serio);
152  fail2: serio_set_drvdata(serio, NULL);
153  fail1: input_free_device(input_dev);
154         kfree(tw);
155         return err;
156 }
157 
158 /*
159  * The serio driver structure.
160  */
161 
162 static struct serio_device_id tw_serio_ids[] = {
163         {
164                 .type   = SERIO_RS232,
165                 .proto  = SERIO_TOUCHWIN,
166                 .id     = SERIO_ANY,
167                 .extra  = SERIO_ANY,
168         },
169         { 0 }
170 };
171 
172 MODULE_DEVICE_TABLE(serio, tw_serio_ids);
173 
174 static struct serio_driver tw_drv = {
175         .driver         = {
176                 .name   = "touchwin",
177         },
178         .description    = DRIVER_DESC,
179         .id_table       = tw_serio_ids,
180         .interrupt      = tw_interrupt,
181         .connect        = tw_connect,
182         .disconnect     = tw_disconnect,
183 };
184 
185 module_serio_driver(tw_drv);
186 

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