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Linux/drivers/input/touchscreen/gunze.c

  1 /*
  2  *  Copyright (c) 2000-2001 Vojtech Pavlik
  3  */
  4 
  5 /*
  6  * Gunze AHL-51S touchscreen driver for Linux
  7  */
  8 
  9 /*
 10  * This program is free software; you can redistribute it and/or modify
 11  * it under the terms of the GNU General Public License as published by
 12  * the Free Software Foundation; either version 2 of the License, or
 13  * (at your option) any later version.
 14  *
 15  * This program is distributed in the hope that it will be useful,
 16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 18  * GNU General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public License
 21  * along with this program; if not, write to the Free Software
 22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 23  *
 24  * Should you need to contact me, the author, you can do so either by
 25  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
 26  * Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
 27  */
 28 
 29 #include <linux/errno.h>
 30 #include <linux/kernel.h>
 31 #include <linux/module.h>
 32 #include <linux/slab.h>
 33 #include <linux/input.h>
 34 #include <linux/serio.h>
 35 
 36 #define DRIVER_DESC     "Gunze AHL-51S touchscreen driver"
 37 
 38 MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>");
 39 MODULE_DESCRIPTION(DRIVER_DESC);
 40 MODULE_LICENSE("GPL");
 41 
 42 /*
 43  * Definitions & global arrays.
 44  */
 45 
 46 #define GUNZE_MAX_LENGTH        10
 47 
 48 /*
 49  * Per-touchscreen data.
 50  */
 51 
 52 struct gunze {
 53         struct input_dev *dev;
 54         struct serio *serio;
 55         int idx;
 56         unsigned char data[GUNZE_MAX_LENGTH];
 57         char phys[32];
 58 };
 59 
 60 static void gunze_process_packet(struct gunze* gunze)
 61 {
 62         struct input_dev *dev = gunze->dev;
 63 
 64         if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' ||
 65                 (gunze->data[0] != 'T' && gunze->data[0] != 'R')) {
 66                 printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data);
 67                 return;
 68         }
 69 
 70         input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10));
 71         input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10));
 72         input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T');
 73         input_sync(dev);
 74 }
 75 
 76 static irqreturn_t gunze_interrupt(struct serio *serio,
 77                 unsigned char data, unsigned int flags)
 78 {
 79         struct gunze* gunze = serio_get_drvdata(serio);
 80 
 81         if (data == '\r') {
 82                 gunze_process_packet(gunze);
 83                 gunze->idx = 0;
 84         } else {
 85                 if (gunze->idx < GUNZE_MAX_LENGTH)
 86                         gunze->data[gunze->idx++] = data;
 87         }
 88         return IRQ_HANDLED;
 89 }
 90 
 91 /*
 92  * gunze_disconnect() is the opposite of gunze_connect()
 93  */
 94 
 95 static void gunze_disconnect(struct serio *serio)
 96 {
 97         struct gunze *gunze = serio_get_drvdata(serio);
 98 
 99         input_get_device(gunze->dev);
100         input_unregister_device(gunze->dev);
101         serio_close(serio);
102         serio_set_drvdata(serio, NULL);
103         input_put_device(gunze->dev);
104         kfree(gunze);
105 }
106 
107 /*
108  * gunze_connect() is the routine that is called when someone adds a
109  * new serio device that supports Gunze protocol and registers it as
110  * an input device.
111  */
112 
113 static int gunze_connect(struct serio *serio, struct serio_driver *drv)
114 {
115         struct gunze *gunze;
116         struct input_dev *input_dev;
117         int err;
118 
119         gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL);
120         input_dev = input_allocate_device();
121         if (!gunze || !input_dev) {
122                 err = -ENOMEM;
123                 goto fail1;
124         }
125 
126         gunze->serio = serio;
127         gunze->dev = input_dev;
128         snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys);
129 
130         input_dev->name = "Gunze AHL-51S TouchScreen";
131         input_dev->phys = gunze->phys;
132         input_dev->id.bustype = BUS_RS232;
133         input_dev->id.vendor = SERIO_GUNZE;
134         input_dev->id.product = 0x0051;
135         input_dev->id.version = 0x0100;
136         input_dev->dev.parent = &serio->dev;
137         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
138         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
139         input_set_abs_params(input_dev, ABS_X, 24, 1000, 0, 0);
140         input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0);
141 
142         serio_set_drvdata(serio, gunze);
143 
144         err = serio_open(serio, drv);
145         if (err)
146                 goto fail2;
147 
148         err = input_register_device(gunze->dev);
149         if (err)
150                 goto fail3;
151 
152         return 0;
153 
154  fail3: serio_close(serio);
155  fail2: serio_set_drvdata(serio, NULL);
156  fail1: input_free_device(input_dev);
157         kfree(gunze);
158         return err;
159 }
160 
161 /*
162  * The serio driver structure.
163  */
164 
165 static struct serio_device_id gunze_serio_ids[] = {
166         {
167                 .type   = SERIO_RS232,
168                 .proto  = SERIO_GUNZE,
169                 .id     = SERIO_ANY,
170                 .extra  = SERIO_ANY,
171         },
172         { 0 }
173 };
174 
175 MODULE_DEVICE_TABLE(serio, gunze_serio_ids);
176 
177 static struct serio_driver gunze_drv = {
178         .driver         = {
179                 .name   = "gunze",
180         },
181         .description    = DRIVER_DESC,
182         .id_table       = gunze_serio_ids,
183         .interrupt      = gunze_interrupt,
184         .connect        = gunze_connect,
185         .disconnect     = gunze_disconnect,
186 };
187 
188 module_serio_driver(gunze_drv);
189 

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