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Linux/drivers/input/touchscreen/touchright.c

  1 /*
  2  * Touchright 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 #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 
 24 #define DRIVER_DESC     "Touchright serial touchscreen driver"
 25 
 26 MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>");
 27 MODULE_DESCRIPTION(DRIVER_DESC);
 28 MODULE_LICENSE("GPL");
 29 
 30 /*
 31  * Definitions & global arrays.
 32  */
 33 
 34 #define TR_FORMAT_TOUCH_BIT     0x01
 35 #define TR_FORMAT_STATUS_BYTE   0x40
 36 #define TR_FORMAT_STATUS_MASK   ~TR_FORMAT_TOUCH_BIT
 37 
 38 #define TR_LENGTH 5
 39 
 40 #define TR_MIN_XC 0
 41 #define TR_MAX_XC 0x1ff
 42 #define TR_MIN_YC 0
 43 #define TR_MAX_YC 0x1ff
 44 
 45 /*
 46  * Per-touchscreen data.
 47  */
 48 
 49 struct tr {
 50         struct input_dev *dev;
 51         struct serio *serio;
 52         int idx;
 53         unsigned char data[TR_LENGTH];
 54         char phys[32];
 55 };
 56 
 57 static irqreturn_t tr_interrupt(struct serio *serio,
 58                 unsigned char data, unsigned int flags)
 59 {
 60         struct tr *tr = serio_get_drvdata(serio);
 61         struct input_dev *dev = tr->dev;
 62 
 63         tr->data[tr->idx] = data;
 64 
 65         if ((tr->data[0] & TR_FORMAT_STATUS_MASK) == TR_FORMAT_STATUS_BYTE) {
 66                 if (++tr->idx == TR_LENGTH) {
 67                         input_report_abs(dev, ABS_X,
 68                                 (tr->data[1] << 5) | (tr->data[2] >> 1));
 69                         input_report_abs(dev, ABS_Y,
 70                                 (tr->data[3] << 5) | (tr->data[4] >> 1));
 71                         input_report_key(dev, BTN_TOUCH,
 72                                 tr->data[0] & TR_FORMAT_TOUCH_BIT);
 73                         input_sync(dev);
 74                         tr->idx = 0;
 75                 }
 76         }
 77 
 78         return IRQ_HANDLED;
 79 }
 80 
 81 /*
 82  * tr_disconnect() is the opposite of tr_connect()
 83  */
 84 
 85 static void tr_disconnect(struct serio *serio)
 86 {
 87         struct tr *tr = serio_get_drvdata(serio);
 88 
 89         input_get_device(tr->dev);
 90         input_unregister_device(tr->dev);
 91         serio_close(serio);
 92         serio_set_drvdata(serio, NULL);
 93         input_put_device(tr->dev);
 94         kfree(tr);
 95 }
 96 
 97 /*
 98  * tr_connect() is the routine that is called when someone adds a
 99  * new serio device that supports the Touchright protocol and registers it as
100  * an input device.
101  */
102 
103 static int tr_connect(struct serio *serio, struct serio_driver *drv)
104 {
105         struct tr *tr;
106         struct input_dev *input_dev;
107         int err;
108 
109         tr = kzalloc(sizeof(struct tr), GFP_KERNEL);
110         input_dev = input_allocate_device();
111         if (!tr || !input_dev) {
112                 err = -ENOMEM;
113                 goto fail1;
114         }
115 
116         tr->serio = serio;
117         tr->dev = input_dev;
118         snprintf(tr->phys, sizeof(tr->phys), "%s/input0", serio->phys);
119 
120         input_dev->name = "Touchright Serial TouchScreen";
121         input_dev->phys = tr->phys;
122         input_dev->id.bustype = BUS_RS232;
123         input_dev->id.vendor = SERIO_TOUCHRIGHT;
124         input_dev->id.product = 0;
125         input_dev->id.version = 0x0100;
126         input_dev->dev.parent = &serio->dev;
127         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
128         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
129         input_set_abs_params(tr->dev, ABS_X, TR_MIN_XC, TR_MAX_XC, 0, 0);
130         input_set_abs_params(tr->dev, ABS_Y, TR_MIN_YC, TR_MAX_YC, 0, 0);
131 
132         serio_set_drvdata(serio, tr);
133 
134         err = serio_open(serio, drv);
135         if (err)
136                 goto fail2;
137 
138         err = input_register_device(tr->dev);
139         if (err)
140                 goto fail3;
141 
142         return 0;
143 
144  fail3: serio_close(serio);
145  fail2: serio_set_drvdata(serio, NULL);
146  fail1: input_free_device(input_dev);
147         kfree(tr);
148         return err;
149 }
150 
151 /*
152  * The serio driver structure.
153  */
154 
155 static struct serio_device_id tr_serio_ids[] = {
156         {
157                 .type   = SERIO_RS232,
158                 .proto  = SERIO_TOUCHRIGHT,
159                 .id     = SERIO_ANY,
160                 .extra  = SERIO_ANY,
161         },
162         { 0 }
163 };
164 
165 MODULE_DEVICE_TABLE(serio, tr_serio_ids);
166 
167 static struct serio_driver tr_drv = {
168         .driver         = {
169                 .name   = "touchright",
170         },
171         .description    = DRIVER_DESC,
172         .id_table       = tr_serio_ids,
173         .interrupt      = tr_interrupt,
174         .connect        = tr_connect,
175         .disconnect     = tr_disconnect,
176 };
177 
178 module_serio_driver(tr_drv);
179 

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