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Linux/drivers/input/touchscreen/fujitsu_ts.c

  1 /*
  2  * Fujitsu serial touchscreen driver
  3  *
  4  * Copyright (c) Dmitry Torokhov <dtor@mail.ru>
  5  */
  6 
  7 /*
  8  * This program is free software; you can redistribute it and/or modify it
  9  * under the terms of the GNU General Public License version 2 as published
 10  * by the Free Software Foundation.
 11  */
 12 
 13 #include <linux/errno.h>
 14 #include <linux/kernel.h>
 15 #include <linux/module.h>
 16 #include <linux/slab.h>
 17 #include <linux/input.h>
 18 #include <linux/serio.h>
 19 
 20 #define DRIVER_DESC     "Fujitsu serial touchscreen driver"
 21 
 22 MODULE_AUTHOR("Dmitry Torokhov <dtor@mail.ru>");
 23 MODULE_DESCRIPTION(DRIVER_DESC);
 24 MODULE_LICENSE("GPL");
 25 
 26 #define FUJITSU_LENGTH 5
 27 
 28 /*
 29  * Per-touchscreen data.
 30  */
 31 struct fujitsu {
 32         struct input_dev *dev;
 33         struct serio *serio;
 34         int idx;
 35         unsigned char data[FUJITSU_LENGTH];
 36         char phys[32];
 37 };
 38 
 39 /*
 40  * Decode serial data (5 bytes per packet)
 41  * First byte
 42  * 1 C 0 0 R S S S
 43  * Where C is 1 while in calibration mode (which we don't use)
 44  * R is 1 when no coordinate corection was done.
 45  * S are button state
 46  */
 47 static irqreturn_t fujitsu_interrupt(struct serio *serio,
 48                                      unsigned char data, unsigned int flags)
 49 {
 50         struct fujitsu *fujitsu = serio_get_drvdata(serio);
 51         struct input_dev *dev = fujitsu->dev;
 52 
 53         if (fujitsu->idx == 0) {
 54                 /* resync skip until start of frame */
 55                 if ((data & 0xf0) != 0x80)
 56                         return IRQ_HANDLED;
 57         } else {
 58                 /* resync skip garbage */
 59                 if (data & 0x80) {
 60                         fujitsu->idx = 0;
 61                         return IRQ_HANDLED;
 62                 }
 63         }
 64 
 65         fujitsu->data[fujitsu->idx++] = data;
 66         if (fujitsu->idx == FUJITSU_LENGTH) {
 67                 input_report_abs(dev, ABS_X,
 68                                  (fujitsu->data[2] << 7) | fujitsu->data[1]);
 69                 input_report_abs(dev, ABS_Y,
 70                                  (fujitsu->data[4] << 7) | fujitsu->data[3]);
 71                 input_report_key(dev, BTN_TOUCH,
 72                                  (fujitsu->data[0] & 0x03) != 2);
 73                 input_sync(dev);
 74                 fujitsu->idx = 0;
 75         }
 76 
 77         return IRQ_HANDLED;
 78 }
 79 
 80 /*
 81  * fujitsu_disconnect() is the opposite of fujitsu_connect()
 82  */
 83 static void fujitsu_disconnect(struct serio *serio)
 84 {
 85         struct fujitsu *fujitsu = serio_get_drvdata(serio);
 86 
 87         input_get_device(fujitsu->dev);
 88         input_unregister_device(fujitsu->dev);
 89         serio_close(serio);
 90         serio_set_drvdata(serio, NULL);
 91         input_put_device(fujitsu->dev);
 92         kfree(fujitsu);
 93 }
 94 
 95 /*
 96  * fujitsu_connect() is the routine that is called when someone adds a
 97  * new serio device that supports the Fujitsu protocol and registers it
 98  * as input device.
 99  */
100 static int fujitsu_connect(struct serio *serio, struct serio_driver *drv)
101 {
102         struct fujitsu *fujitsu;
103         struct input_dev *input_dev;
104         int err;
105 
106         fujitsu = kzalloc(sizeof(struct fujitsu), GFP_KERNEL);
107         input_dev = input_allocate_device();
108         if (!fujitsu || !input_dev) {
109                 err = -ENOMEM;
110                 goto fail1;
111         }
112 
113         fujitsu->serio = serio;
114         fujitsu->dev = input_dev;
115         snprintf(fujitsu->phys, sizeof(fujitsu->phys),
116                  "%s/input0", serio->phys);
117 
118         input_dev->name = "Fujitsu Serial Touchscreen";
119         input_dev->phys = fujitsu->phys;
120         input_dev->id.bustype = BUS_RS232;
121         input_dev->id.vendor = SERIO_FUJITSU;
122         input_dev->id.product = 0;
123         input_dev->id.version = 0x0100;
124         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
125         input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
126 
127         input_set_abs_params(input_dev, ABS_X, 0, 4096, 0, 0);
128         input_set_abs_params(input_dev, ABS_Y, 0, 4096, 0, 0);
129         serio_set_drvdata(serio, fujitsu);
130 
131         err = serio_open(serio, drv);
132         if (err)
133                 goto fail2;
134 
135         err = input_register_device(fujitsu->dev);
136         if (err)
137                 goto fail3;
138 
139         return 0;
140 
141  fail3:
142         serio_close(serio);
143  fail2:
144         serio_set_drvdata(serio, NULL);
145  fail1:
146         input_free_device(input_dev);
147         kfree(fujitsu);
148         return err;
149 }
150 
151 /*
152  * The serio driver structure.
153  */
154 static struct serio_device_id fujitsu_serio_ids[] = {
155         {
156                 .type   = SERIO_RS232,
157                 .proto  = SERIO_FUJITSU,
158                 .id     = SERIO_ANY,
159                 .extra  = SERIO_ANY,
160         },
161         { 0 }
162 };
163 
164 MODULE_DEVICE_TABLE(serio, fujitsu_serio_ids);
165 
166 static struct serio_driver fujitsu_drv = {
167         .driver         = {
168                 .name   = "fujitsu_ts",
169         },
170         .description    = DRIVER_DESC,
171         .id_table       = fujitsu_serio_ids,
172         .interrupt      = fujitsu_interrupt,
173         .connect        = fujitsu_connect,
174         .disconnect     = fujitsu_disconnect,
175 };
176 
177 module_serio_driver(fujitsu_drv);
178 

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