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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> | |
4003dff4 RK |
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, | |
7d12e780 | 58 | unsigned char data, unsigned int flags) |
4003dff4 RK |
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) { | |
4003dff4 RK |
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 | ||
4003dff4 RK |
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; | |
a5394fb0 | 126 | input_dev->dev.parent = &serio->dev; |
7b19ada2 JS |
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); | |
4003dff4 RK |
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 | ||
65ac9f7a | 178 | module_serio_driver(tr_drv); |