1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Copyright (c) 2000-2001 Vojtech Pavlik
7 * Gunze AHL-51S touchscreen driver for Linux
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>
20 #define DRIVER_DESC "Gunze AHL-51S touchscreen driver"
23 MODULE_DESCRIPTION(DRIVER_DESC);
24 MODULE_LICENSE("GPL");
27 * Definitions & global arrays.
30 #define GUNZE_MAX_LENGTH 10
33 * Per-touchscreen data.
37 struct input_dev *dev;
40 unsigned char data[GUNZE_MAX_LENGTH];
44 static void gunze_process_packet(struct gunze *gunze)
46 struct input_dev *dev = gunze->dev;
48 if (gunze->idx != GUNZE_MAX_LENGTH || gunze->data[5] != ',' ||
49 (gunze->data[0] != 'T' && gunze->data[0] != 'R')) {
50 printk(KERN_WARNING "gunze.c: bad packet: >%.*s<\n", GUNZE_MAX_LENGTH, gunze->data);
54 input_report_abs(dev, ABS_X, simple_strtoul(gunze->data + 1, NULL, 10));
55 input_report_abs(dev, ABS_Y, 1024 - simple_strtoul(gunze->data + 6, NULL, 10));
56 input_report_key(dev, BTN_TOUCH, gunze->data[0] == 'T');
60 static irqreturn_t gunze_interrupt(struct serio *serio,
61 unsigned char data, unsigned int flags)
63 struct gunze *gunze = serio_get_drvdata(serio);
66 gunze_process_packet(gunze);
69 if (gunze->idx < GUNZE_MAX_LENGTH)
70 gunze->data[gunze->idx++] = data;
76 * gunze_disconnect() is the opposite of gunze_connect()
79 static void gunze_disconnect(struct serio *serio)
81 struct gunze *gunze = serio_get_drvdata(serio);
83 input_get_device(gunze->dev);
84 input_unregister_device(gunze->dev);
86 serio_set_drvdata(serio, NULL);
87 input_put_device(gunze->dev);
92 * gunze_connect() is the routine that is called when someone adds a
93 * new serio device that supports Gunze protocol and registers it as
97 static int gunze_connect(struct serio *serio, struct serio_driver *drv)
100 struct input_dev *input_dev;
103 gunze = kzalloc(sizeof(struct gunze), GFP_KERNEL);
104 input_dev = input_allocate_device();
105 if (!gunze || !input_dev) {
110 gunze->serio = serio;
111 gunze->dev = input_dev;
112 snprintf(gunze->phys, sizeof(serio->phys), "%s/input0", serio->phys);
114 input_dev->name = "Gunze AHL-51S TouchScreen";
115 input_dev->phys = gunze->phys;
116 input_dev->id.bustype = BUS_RS232;
117 input_dev->id.vendor = SERIO_GUNZE;
118 input_dev->id.product = 0x0051;
119 input_dev->id.version = 0x0100;
120 input_dev->dev.parent = &serio->dev;
121 input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
122 input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);
123 input_set_abs_params(input_dev, ABS_X, 24, 1000, 0, 0);
124 input_set_abs_params(input_dev, ABS_Y, 24, 1000, 0, 0);
126 serio_set_drvdata(serio, gunze);
128 err = serio_open(serio, drv);
132 err = input_register_device(gunze->dev);
138 fail3: serio_close(serio);
139 fail2: serio_set_drvdata(serio, NULL);
140 fail1: input_free_device(input_dev);
146 * The serio driver structure.
149 static const struct serio_device_id gunze_serio_ids[] = {
152 .proto = SERIO_GUNZE,
159 MODULE_DEVICE_TABLE(serio, gunze_serio_ids);
161 static struct serio_driver gunze_drv = {
165 .description = DRIVER_DESC,
166 .id_table = gunze_serio_ids,
167 .interrupt = gunze_interrupt,
168 .connect = gunze_connect,
169 .disconnect = gunze_disconnect,
172 module_serio_driver(gunze_drv);