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1da177e4 LT |
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 | ||
1da177e4 LT |
54 | /* |
55 | * Per-touchscreen data. | |
56 | */ | |
57 | ||
58 | struct mtouch { | |
eca1ed19 | 59 | struct input_dev *dev; |
1da177e4 LT |
60 | struct serio *serio; |
61 | int idx; | |
62 | unsigned char data[MTOUCH_MAX_LENGTH]; | |
63 | char phys[32]; | |
64 | }; | |
65 | ||
7d12e780 | 66 | static void mtouch_process_format_tablet(struct mtouch *mtouch) |
1da177e4 | 67 | { |
eca1ed19 | 68 | struct input_dev *dev = mtouch->dev; |
1da177e4 LT |
69 | |
70 | if (MTOUCH_FORMAT_TABLET_LENGTH == ++mtouch->idx) { | |
1da177e4 LT |
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 | ||
7d12e780 | 80 | static void mtouch_process_response(struct mtouch *mtouch) |
1da177e4 LT |
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, | |
7d12e780 | 92 | unsigned char data, unsigned int flags) |
1da177e4 LT |
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]) | |
7d12e780 | 99 | mtouch_process_format_tablet(mtouch); |
1da177e4 | 100 | else if (MTOUCH_RESPONSE_BEGIN_BYTE == mtouch->data[0]) |
7d12e780 | 101 | mtouch_process_response(mtouch); |
1da177e4 LT |
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 | ||
eca1ed19 DT |
116 | input_get_device(mtouch->dev); |
117 | input_unregister_device(mtouch->dev); | |
1da177e4 LT |
118 | serio_close(serio); |
119 | serio_set_drvdata(serio, NULL); | |
eca1ed19 | 120 | input_put_device(mtouch->dev); |
1da177e4 LT |
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; | |
eca1ed19 | 133 | struct input_dev *input_dev; |
1da177e4 LT |
134 | int err; |
135 | ||
eca1ed19 DT |
136 | mtouch = kzalloc(sizeof(struct mtouch), GFP_KERNEL); |
137 | input_dev = input_allocate_device(); | |
138 | if (!mtouch || !input_dev) { | |
139 | err = -ENOMEM; | |
52c1f570 | 140 | goto fail1; |
eca1ed19 | 141 | } |
1da177e4 LT |
142 | |
143 | mtouch->serio = serio; | |
eca1ed19 | 144 | mtouch->dev = input_dev; |
a21466cc | 145 | snprintf(mtouch->phys, sizeof(mtouch->phys), "%s/input0", serio->phys); |
1da177e4 | 146 | |
eca1ed19 DT |
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; | |
a5394fb0 | 153 | input_dev->dev.parent = &serio->dev; |
7b19ada2 JS |
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); | |
eca1ed19 DT |
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); | |
1da177e4 LT |
158 | |
159 | serio_set_drvdata(serio, mtouch); | |
160 | ||
161 | err = serio_open(serio, drv); | |
eca1ed19 | 162 | if (err) |
52c1f570 | 163 | goto fail2; |
1da177e4 | 164 | |
52c1f570 DT |
165 | err = input_register_device(mtouch->dev); |
166 | if (err) | |
167 | goto fail3; | |
1da177e4 LT |
168 | |
169 | return 0; | |
eca1ed19 | 170 | |
52c1f570 DT |
171 | fail3: serio_close(serio); |
172 | fail2: serio_set_drvdata(serio, NULL); | |
173 | fail1: input_free_device(input_dev); | |
eca1ed19 DT |
174 | kfree(mtouch); |
175 | return err; | |
1da177e4 LT |
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 | ||
65ac9f7a | 205 | module_serio_driver(mtouch_drv); |