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4003dff4 RK |
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 | #include <linux/init.h> | |
24 | ||
25 | #define DRIVER_DESC "Touchright serial touchscreen driver" | |
26 | ||
27 | MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>"); | |
28 | MODULE_DESCRIPTION(DRIVER_DESC); | |
29 | MODULE_LICENSE("GPL"); | |
30 | ||
31 | /* | |
32 | * Definitions & global arrays. | |
33 | */ | |
34 | ||
35 | #define TR_FORMAT_TOUCH_BIT 0x01 | |
36 | #define TR_FORMAT_STATUS_BYTE 0x40 | |
37 | #define TR_FORMAT_STATUS_MASK ~TR_FORMAT_TOUCH_BIT | |
38 | ||
39 | #define TR_LENGTH 5 | |
40 | ||
41 | #define TR_MIN_XC 0 | |
42 | #define TR_MAX_XC 0x1ff | |
43 | #define TR_MIN_YC 0 | |
44 | #define TR_MAX_YC 0x1ff | |
45 | ||
46 | /* | |
47 | * Per-touchscreen data. | |
48 | */ | |
49 | ||
50 | struct tr { | |
51 | struct input_dev *dev; | |
52 | struct serio *serio; | |
53 | int idx; | |
54 | unsigned char data[TR_LENGTH]; | |
55 | char phys[32]; | |
56 | }; | |
57 | ||
58 | static irqreturn_t tr_interrupt(struct serio *serio, | |
7d12e780 | 59 | unsigned char data, unsigned int flags) |
4003dff4 RK |
60 | { |
61 | struct tr *tr = serio_get_drvdata(serio); | |
62 | struct input_dev *dev = tr->dev; | |
63 | ||
64 | tr->data[tr->idx] = data; | |
65 | ||
66 | if ((tr->data[0] & TR_FORMAT_STATUS_MASK) == TR_FORMAT_STATUS_BYTE) { | |
67 | if (++tr->idx == TR_LENGTH) { | |
4003dff4 RK |
68 | input_report_abs(dev, ABS_X, |
69 | (tr->data[1] << 5) | (tr->data[2] >> 1)); | |
70 | input_report_abs(dev, ABS_Y, | |
71 | (tr->data[3] << 5) | (tr->data[4] >> 1)); | |
72 | input_report_key(dev, BTN_TOUCH, | |
73 | tr->data[0] & TR_FORMAT_TOUCH_BIT); | |
74 | input_sync(dev); | |
75 | tr->idx = 0; | |
76 | } | |
77 | } | |
78 | ||
79 | return IRQ_HANDLED; | |
80 | } | |
81 | ||
82 | /* | |
83 | * tr_disconnect() is the opposite of tr_connect() | |
84 | */ | |
85 | ||
86 | static void tr_disconnect(struct serio *serio) | |
87 | { | |
88 | struct tr *tr = serio_get_drvdata(serio); | |
89 | ||
90 | input_get_device(tr->dev); | |
91 | input_unregister_device(tr->dev); | |
92 | serio_close(serio); | |
93 | serio_set_drvdata(serio, NULL); | |
94 | input_put_device(tr->dev); | |
95 | kfree(tr); | |
96 | } | |
97 | ||
98 | /* | |
99 | * tr_connect() is the routine that is called when someone adds a | |
100 | * new serio device that supports the Touchright protocol and registers it as | |
101 | * an input device. | |
102 | */ | |
103 | ||
104 | static int tr_connect(struct serio *serio, struct serio_driver *drv) | |
105 | { | |
106 | struct tr *tr; | |
107 | struct input_dev *input_dev; | |
108 | int err; | |
109 | ||
110 | tr = kzalloc(sizeof(struct tr), GFP_KERNEL); | |
111 | input_dev = input_allocate_device(); | |
112 | if (!tr || !input_dev) { | |
113 | err = -ENOMEM; | |
114 | goto fail1; | |
115 | } | |
116 | ||
117 | tr->serio = serio; | |
118 | tr->dev = input_dev; | |
119 | snprintf(tr->phys, sizeof(tr->phys), "%s/input0", serio->phys); | |
120 | ||
4003dff4 RK |
121 | input_dev->name = "Touchright Serial TouchScreen"; |
122 | input_dev->phys = tr->phys; | |
123 | input_dev->id.bustype = BUS_RS232; | |
124 | input_dev->id.vendor = SERIO_TOUCHRIGHT; | |
125 | input_dev->id.product = 0; | |
126 | input_dev->id.version = 0x0100; | |
127 | input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); | |
128 | input_dev->keybit[LONG(BTN_TOUCH)] = BIT(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 | /* | |
179 | * The functions for inserting/removing us as a module. | |
180 | */ | |
181 | ||
182 | static int __init tr_init(void) | |
183 | { | |
153a9df0 | 184 | return serio_register_driver(&tr_drv); |
4003dff4 RK |
185 | } |
186 | ||
187 | static void __exit tr_exit(void) | |
188 | { | |
189 | serio_unregister_driver(&tr_drv); | |
190 | } | |
191 | ||
192 | module_init(tr_init); | |
193 | module_exit(tr_exit); |