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11ea3173 RK |
1 | /* |
2 | * Touchwindow 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 | /* | |
18 | * 2005/02/19 Rick Koch: | |
19 | * The Touchwindow I used is made by Edmark Corp. and | |
20 | * constantly outputs a stream of 0's unless it is touched. | |
21 | * It then outputs 3 bytes: X, Y, and a copy of Y. | |
22 | */ | |
23 | ||
24 | #include <linux/errno.h> | |
25 | #include <linux/kernel.h> | |
26 | #include <linux/module.h> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/input.h> | |
29 | #include <linux/serio.h> | |
11ea3173 RK |
30 | |
31 | #define DRIVER_DESC "Touchwindow serial touchscreen driver" | |
32 | ||
33 | MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>"); | |
34 | MODULE_DESCRIPTION(DRIVER_DESC); | |
35 | MODULE_LICENSE("GPL"); | |
36 | ||
37 | /* | |
38 | * Definitions & global arrays. | |
39 | */ | |
40 | ||
41 | #define TW_LENGTH 3 | |
42 | ||
43 | #define TW_MIN_XC 0 | |
44 | #define TW_MAX_XC 0xff | |
45 | #define TW_MIN_YC 0 | |
46 | #define TW_MAX_YC 0xff | |
47 | ||
48 | /* | |
49 | * Per-touchscreen data. | |
50 | */ | |
51 | ||
52 | struct tw { | |
53 | struct input_dev *dev; | |
54 | struct serio *serio; | |
55 | int idx; | |
56 | int touched; | |
57 | unsigned char data[TW_LENGTH]; | |
58 | char phys[32]; | |
59 | }; | |
60 | ||
61 | static irqreturn_t tw_interrupt(struct serio *serio, | |
7d12e780 | 62 | unsigned char data, unsigned int flags) |
11ea3173 RK |
63 | { |
64 | struct tw *tw = serio_get_drvdata(serio); | |
65 | struct input_dev *dev = tw->dev; | |
66 | ||
67 | if (data) { /* touch */ | |
68 | tw->touched = 1; | |
69 | tw->data[tw->idx++] = data; | |
70 | /* verify length and that the two Y's are the same */ | |
71 | if (tw->idx == TW_LENGTH && tw->data[1] == tw->data[2]) { | |
11ea3173 RK |
72 | input_report_abs(dev, ABS_X, tw->data[0]); |
73 | input_report_abs(dev, ABS_Y, tw->data[1]); | |
74 | input_report_key(dev, BTN_TOUCH, 1); | |
75 | input_sync(dev); | |
76 | tw->idx = 0; | |
77 | } | |
78 | } else if (tw->touched) { /* untouch */ | |
79 | input_report_key(dev, BTN_TOUCH, 0); | |
80 | input_sync(dev); | |
81 | tw->idx = 0; | |
82 | tw->touched = 0; | |
83 | } | |
84 | ||
85 | return IRQ_HANDLED; | |
86 | } | |
87 | ||
88 | /* | |
89 | * tw_disconnect() is the opposite of tw_connect() | |
90 | */ | |
91 | ||
92 | static void tw_disconnect(struct serio *serio) | |
93 | { | |
94 | struct tw *tw = serio_get_drvdata(serio); | |
95 | ||
96 | input_get_device(tw->dev); | |
97 | input_unregister_device(tw->dev); | |
98 | serio_close(serio); | |
99 | serio_set_drvdata(serio, NULL); | |
100 | input_put_device(tw->dev); | |
101 | kfree(tw); | |
102 | } | |
103 | ||
104 | /* | |
105 | * tw_connect() is the routine that is called when someone adds a | |
106 | * new serio device that supports the Touchwin protocol and registers it as | |
107 | * an input device. | |
108 | */ | |
109 | ||
110 | static int tw_connect(struct serio *serio, struct serio_driver *drv) | |
111 | { | |
112 | struct tw *tw; | |
113 | struct input_dev *input_dev; | |
114 | int err; | |
115 | ||
116 | tw = kzalloc(sizeof(struct tw), GFP_KERNEL); | |
117 | input_dev = input_allocate_device(); | |
118 | if (!tw || !input_dev) { | |
119 | err = -ENOMEM; | |
120 | goto fail1; | |
121 | } | |
122 | ||
123 | tw->serio = serio; | |
124 | tw->dev = input_dev; | |
125 | snprintf(tw->phys, sizeof(tw->phys), "%s/input0", serio->phys); | |
126 | ||
11ea3173 RK |
127 | input_dev->name = "Touchwindow Serial TouchScreen"; |
128 | input_dev->phys = tw->phys; | |
129 | input_dev->id.bustype = BUS_RS232; | |
130 | input_dev->id.vendor = SERIO_TOUCHWIN; | |
131 | input_dev->id.product = 0; | |
132 | input_dev->id.version = 0x0100; | |
a5394fb0 | 133 | input_dev->dev.parent = &serio->dev; |
7b19ada2 JS |
134 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
135 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
11ea3173 RK |
136 | input_set_abs_params(tw->dev, ABS_X, TW_MIN_XC, TW_MAX_XC, 0, 0); |
137 | input_set_abs_params(tw->dev, ABS_Y, TW_MIN_YC, TW_MAX_YC, 0, 0); | |
138 | ||
139 | serio_set_drvdata(serio, tw); | |
140 | ||
141 | err = serio_open(serio, drv); | |
142 | if (err) | |
143 | goto fail2; | |
144 | ||
145 | err = input_register_device(tw->dev); | |
146 | if (err) | |
147 | goto fail3; | |
148 | ||
149 | return 0; | |
150 | ||
151 | fail3: serio_close(serio); | |
152 | fail2: serio_set_drvdata(serio, NULL); | |
153 | fail1: input_free_device(input_dev); | |
154 | kfree(tw); | |
155 | return err; | |
156 | } | |
157 | ||
158 | /* | |
159 | * The serio driver structure. | |
160 | */ | |
161 | ||
162 | static struct serio_device_id tw_serio_ids[] = { | |
163 | { | |
164 | .type = SERIO_RS232, | |
165 | .proto = SERIO_TOUCHWIN, | |
166 | .id = SERIO_ANY, | |
167 | .extra = SERIO_ANY, | |
168 | }, | |
169 | { 0 } | |
170 | }; | |
171 | ||
172 | MODULE_DEVICE_TABLE(serio, tw_serio_ids); | |
173 | ||
174 | static struct serio_driver tw_drv = { | |
175 | .driver = { | |
176 | .name = "touchwin", | |
177 | }, | |
178 | .description = DRIVER_DESC, | |
179 | .id_table = tw_serio_ids, | |
180 | .interrupt = tw_interrupt, | |
181 | .connect = tw_connect, | |
182 | .disconnect = tw_disconnect, | |
183 | }; | |
184 | ||
65ac9f7a | 185 | module_serio_driver(tw_drv); |