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1 | /* |
2 | * MicroTouch (3M) serial touchscreen driver |
3 | * |
4 | * Copyright (c) 2004 Vojtech Pavlik |
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 by |
10 | * the Free Software Foundation. |
11 | */ |
12 | |
13 | /* |
14 | * 2005/02/19 Dan Streetman <ddstreet@ieee.org> |
15 | * Copied elo.c and edited for MicroTouch protocol |
16 | */ |
17 | |
18 | #include <linux/errno.h> |
19 | #include <linux/kernel.h> |
20 | #include <linux/module.h> |
21 | #include <linux/slab.h> |
22 | #include <linux/input.h> |
23 | #include <linux/serio.h> |
24 | #include <linux/init.h> |
25 | |
26 | #define DRIVER_DESC "MicroTouch serial touchscreen driver" |
27 | |
28 | MODULE_AUTHOR("Vojtech Pavlik <vojtech@ucw.cz>"); |
29 | MODULE_DESCRIPTION(DRIVER_DESC); |
30 | MODULE_LICENSE("GPL"); |
31 | |
32 | /* |
33 | * Definitions & global arrays. |
34 | */ |
35 | |
36 | #define MTOUCH_FORMAT_TABLET_STATUS_BIT 0x80 |
37 | #define MTOUCH_FORMAT_TABLET_TOUCH_BIT 0x40 |
38 | #define MTOUCH_FORMAT_TABLET_LENGTH 5 |
39 | #define MTOUCH_RESPONSE_BEGIN_BYTE 0x01 |
40 | #define MTOUCH_RESPONSE_END_BYTE 0x0d |
41 | |
42 | /* todo: check specs for max length of all responses */ |
43 | #define MTOUCH_MAX_LENGTH 16 |
44 | |
45 | #define MTOUCH_MIN_XC 0 |
46 | #define MTOUCH_MAX_XC 0x3fff |
47 | #define MTOUCH_MIN_YC 0 |
48 | #define MTOUCH_MAX_YC 0x3fff |
49 | |
50 | #define MTOUCH_GET_XC(data) (((data[2])<<7) | data[1]) |
51 | #define MTOUCH_GET_YC(data) (((data[4])<<7) | data[3]) |
52 | #define MTOUCH_GET_TOUCHED(data) (MTOUCH_FORMAT_TABLET_TOUCH_BIT & data[0]) |
53 | |
54 | /* |
55 | * Per-touchscreen data. |
56 | */ |
57 | |
58 | struct mtouch { |
59 | struct input_dev *dev; |
60 | struct serio *serio; |
61 | int idx; |
62 | unsigned char data[MTOUCH_MAX_LENGTH]; |
63 | char phys[32]; |
64 | }; |
65 | |
66 | static void mtouch_process_format_tablet(struct mtouch *mtouch) |
67 | { |
68 | struct input_dev *dev = mtouch->dev; |
69 | |
70 | if (MTOUCH_FORMAT_TABLET_LENGTH == ++mtouch->idx) { |
71 | input_report_abs(dev, ABS_X, MTOUCH_GET_XC(mtouch->data)); |
72 | input_report_abs(dev, ABS_Y, MTOUCH_MAX_YC - MTOUCH_GET_YC(mtouch->data)); |
73 | input_report_key(dev, BTN_TOUCH, MTOUCH_GET_TOUCHED(mtouch->data)); |
74 | input_sync(dev); |
75 | |
76 | mtouch->idx = 0; |
77 | } |
78 | } |
79 | |
80 | static void mtouch_process_response(struct mtouch *mtouch) |
81 | { |
82 | if (MTOUCH_RESPONSE_END_BYTE == mtouch->data[mtouch->idx++]) { |
83 | /* FIXME - process response */ |
84 | mtouch->idx = 0; |
85 | } else if (MTOUCH_MAX_LENGTH == mtouch->idx) { |
86 | printk(KERN_ERR "mtouch.c: too many response bytes\n"); |
87 | mtouch->idx = 0; |
88 | } |
89 | } |
90 | |
91 | static irqreturn_t mtouch_interrupt(struct serio *serio, |
92 | unsigned char data, unsigned int flags) |
93 | { |
94 | struct mtouch* mtouch = serio_get_drvdata(serio); |
95 | |
96 | mtouch->data[mtouch->idx] = data; |
97 | |
98 | if (MTOUCH_FORMAT_TABLET_STATUS_BIT & mtouch->data[0]) |
99 | mtouch_process_format_tablet(mtouch); |
100 | else if (MTOUCH_RESPONSE_BEGIN_BYTE == mtouch->data[0]) |
101 | mtouch_process_response(mtouch); |
102 | else |
103 | printk(KERN_DEBUG "mtouch.c: unknown/unsynchronized data from device, byte %x\n",mtouch->data[0]); |
104 | |
105 | return IRQ_HANDLED; |
106 | } |
107 | |
108 | /* |
109 | * mtouch_disconnect() is the opposite of mtouch_connect() |
110 | */ |
111 | |
112 | static void mtouch_disconnect(struct serio *serio) |
113 | { |
114 | struct mtouch* mtouch = serio_get_drvdata(serio); |
115 | |
116 | input_get_device(mtouch->dev); |
117 | input_unregister_device(mtouch->dev); |
118 | serio_close(serio); |
119 | serio_set_drvdata(serio, NULL); |
120 | input_put_device(mtouch->dev); |
121 | kfree(mtouch); |
122 | } |
123 | |
124 | /* |
125 | * mtouch_connect() is the routine that is called when someone adds a |
126 | * new serio device that supports MicroTouch (Format Tablet) protocol and registers it as |
127 | * an input device. |
128 | */ |
129 | |
130 | static int mtouch_connect(struct serio *serio, struct serio_driver *drv) |
131 | { |
132 | struct mtouch *mtouch; |
133 | struct input_dev *input_dev; |
134 | int err; |
135 | |
136 | mtouch = kzalloc(sizeof(struct mtouch), GFP_KERNEL); |
137 | input_dev = input_allocate_device(); |
138 | if (!mtouch || !input_dev) { |
139 | err = -ENOMEM; |
140 | goto fail1; |
141 | } |
142 | |
143 | mtouch->serio = serio; |
144 | mtouch->dev = input_dev; |
145 | snprintf(mtouch->phys, sizeof(mtouch->phys), "%s/input0", serio->phys); |
146 | |
147 | input_dev->name = "MicroTouch Serial TouchScreen"; |
148 | input_dev->phys = mtouch->phys; |
149 | input_dev->id.bustype = BUS_RS232; |
150 | input_dev->id.vendor = SERIO_MICROTOUCH; |
151 | input_dev->id.product = 0; |
152 | input_dev->id.version = 0x0100; |
153 | input_dev->dev.parent = &serio->dev; |
154 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
155 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
156 | input_set_abs_params(mtouch->dev, ABS_X, MTOUCH_MIN_XC, MTOUCH_MAX_XC, 0, 0); |
157 | input_set_abs_params(mtouch->dev, ABS_Y, MTOUCH_MIN_YC, MTOUCH_MAX_YC, 0, 0); |
158 | |
159 | serio_set_drvdata(serio, mtouch); |
160 | |
161 | err = serio_open(serio, drv); |
162 | if (err) |
163 | goto fail2; |
164 | |
165 | err = input_register_device(mtouch->dev); |
166 | if (err) |
167 | goto fail3; |
168 | |
169 | return 0; |
170 | |
171 | fail3: serio_close(serio); |
172 | fail2: serio_set_drvdata(serio, NULL); |
173 | fail1: input_free_device(input_dev); |
174 | kfree(mtouch); |
175 | return err; |
176 | } |
177 | |
178 | /* |
179 | * The serio driver structure. |
180 | */ |
181 | |
182 | static struct serio_device_id mtouch_serio_ids[] = { |
183 | { |
184 | .type = SERIO_RS232, |
185 | .proto = SERIO_MICROTOUCH, |
186 | .id = SERIO_ANY, |
187 | .extra = SERIO_ANY, |
188 | }, |
189 | { 0 } |
190 | }; |
191 | |
192 | MODULE_DEVICE_TABLE(serio, mtouch_serio_ids); |
193 | |
194 | static struct serio_driver mtouch_drv = { |
195 | .driver = { |
196 | .name = "mtouch", |
197 | }, |
198 | .description = DRIVER_DESC, |
199 | .id_table = mtouch_serio_ids, |
200 | .interrupt = mtouch_interrupt, |
201 | .connect = mtouch_connect, |
202 | .disconnect = mtouch_disconnect, |
203 | }; |
204 | |
205 | module_serio_driver(mtouch_drv); |
206 |
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