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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 | ||
66 | static void mtouch_process_format_tablet(struct mtouch *mtouch, struct pt_regs *regs) | |
67 | { | |
eca1ed19 | 68 | struct input_dev *dev = mtouch->dev; |
1da177e4 LT |
69 | |
70 | if (MTOUCH_FORMAT_TABLET_LENGTH == ++mtouch->idx) { | |
71 | input_regs(dev, regs); | |
72 | input_report_abs(dev, ABS_X, MTOUCH_GET_XC(mtouch->data)); | |
73 | input_report_abs(dev, ABS_Y, MTOUCH_MAX_YC - MTOUCH_GET_YC(mtouch->data)); | |
74 | input_report_key(dev, BTN_TOUCH, MTOUCH_GET_TOUCHED(mtouch->data)); | |
75 | input_sync(dev); | |
76 | ||
77 | mtouch->idx = 0; | |
78 | } | |
79 | } | |
80 | ||
81 | static void mtouch_process_response(struct mtouch *mtouch, struct pt_regs *regs) | |
82 | { | |
83 | if (MTOUCH_RESPONSE_END_BYTE == mtouch->data[mtouch->idx++]) { | |
84 | /* FIXME - process response */ | |
85 | mtouch->idx = 0; | |
86 | } else if (MTOUCH_MAX_LENGTH == mtouch->idx) { | |
87 | printk(KERN_ERR "mtouch.c: too many response bytes\n"); | |
88 | mtouch->idx = 0; | |
89 | } | |
90 | } | |
91 | ||
92 | static irqreturn_t mtouch_interrupt(struct serio *serio, | |
93 | unsigned char data, unsigned int flags, struct pt_regs *regs) | |
94 | { | |
95 | struct mtouch* mtouch = serio_get_drvdata(serio); | |
96 | ||
97 | mtouch->data[mtouch->idx] = data; | |
98 | ||
99 | if (MTOUCH_FORMAT_TABLET_STATUS_BIT & mtouch->data[0]) | |
100 | mtouch_process_format_tablet(mtouch, regs); | |
101 | else if (MTOUCH_RESPONSE_BEGIN_BYTE == mtouch->data[0]) | |
102 | mtouch_process_response(mtouch, regs); | |
103 | else | |
104 | printk(KERN_DEBUG "mtouch.c: unknown/unsynchronized data from device, byte %x\n",mtouch->data[0]); | |
105 | ||
106 | return IRQ_HANDLED; | |
107 | } | |
108 | ||
109 | /* | |
110 | * mtouch_disconnect() is the opposite of mtouch_connect() | |
111 | */ | |
112 | ||
113 | static void mtouch_disconnect(struct serio *serio) | |
114 | { | |
115 | struct mtouch* mtouch = serio_get_drvdata(serio); | |
116 | ||
eca1ed19 DT |
117 | input_get_device(mtouch->dev); |
118 | input_unregister_device(mtouch->dev); | |
1da177e4 LT |
119 | serio_close(serio); |
120 | serio_set_drvdata(serio, NULL); | |
eca1ed19 | 121 | input_put_device(mtouch->dev); |
1da177e4 LT |
122 | kfree(mtouch); |
123 | } | |
124 | ||
125 | /* | |
126 | * mtouch_connect() is the routine that is called when someone adds a | |
127 | * new serio device that supports MicroTouch (Format Tablet) protocol and registers it as | |
128 | * an input device. | |
129 | */ | |
130 | ||
131 | static int mtouch_connect(struct serio *serio, struct serio_driver *drv) | |
132 | { | |
133 | struct mtouch *mtouch; | |
eca1ed19 | 134 | struct input_dev *input_dev; |
1da177e4 LT |
135 | int err; |
136 | ||
eca1ed19 DT |
137 | mtouch = kzalloc(sizeof(struct mtouch), GFP_KERNEL); |
138 | input_dev = input_allocate_device(); | |
139 | if (!mtouch || !input_dev) { | |
140 | err = -ENOMEM; | |
141 | goto fail; | |
142 | } | |
1da177e4 LT |
143 | |
144 | mtouch->serio = serio; | |
eca1ed19 | 145 | mtouch->dev = input_dev; |
a21466cc | 146 | snprintf(mtouch->phys, sizeof(mtouch->phys), "%s/input0", serio->phys); |
1da177e4 | 147 | |
eca1ed19 DT |
148 | input_dev->private = mtouch; |
149 | input_dev->name = "MicroTouch Serial TouchScreen"; | |
150 | input_dev->phys = mtouch->phys; | |
151 | input_dev->id.bustype = BUS_RS232; | |
152 | input_dev->id.vendor = SERIO_MICROTOUCH; | |
153 | input_dev->id.product = 0; | |
154 | input_dev->id.version = 0x0100; | |
155 | input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_ABS); | |
156 | input_dev->keybit[LONG(BTN_TOUCH)] = BIT(BTN_TOUCH); | |
157 | input_set_abs_params(mtouch->dev, ABS_X, MTOUCH_MIN_XC, MTOUCH_MAX_XC, 0, 0); | |
158 | input_set_abs_params(mtouch->dev, ABS_Y, MTOUCH_MIN_YC, MTOUCH_MAX_YC, 0, 0); | |
1da177e4 LT |
159 | |
160 | serio_set_drvdata(serio, mtouch); | |
161 | ||
162 | err = serio_open(serio, drv); | |
eca1ed19 DT |
163 | if (err) |
164 | goto fail; | |
1da177e4 | 165 | |
eca1ed19 | 166 | input_register_device(mtouch->dev); |
1da177e4 LT |
167 | |
168 | return 0; | |
eca1ed19 DT |
169 | |
170 | fail: serio_set_drvdata(serio, NULL); | |
171 | input_free_device(input_dev); | |
172 | kfree(mtouch); | |
173 | return err; | |
1da177e4 LT |
174 | } |
175 | ||
176 | /* | |
177 | * The serio driver structure. | |
178 | */ | |
179 | ||
180 | static struct serio_device_id mtouch_serio_ids[] = { | |
181 | { | |
182 | .type = SERIO_RS232, | |
183 | .proto = SERIO_MICROTOUCH, | |
184 | .id = SERIO_ANY, | |
185 | .extra = SERIO_ANY, | |
186 | }, | |
187 | { 0 } | |
188 | }; | |
189 | ||
190 | MODULE_DEVICE_TABLE(serio, mtouch_serio_ids); | |
191 | ||
192 | static struct serio_driver mtouch_drv = { | |
193 | .driver = { | |
194 | .name = "mtouch", | |
195 | }, | |
196 | .description = DRIVER_DESC, | |
197 | .id_table = mtouch_serio_ids, | |
198 | .interrupt = mtouch_interrupt, | |
199 | .connect = mtouch_connect, | |
200 | .disconnect = mtouch_disconnect, | |
201 | }; | |
202 | ||
203 | /* | |
204 | * The functions for inserting/removing us as a module. | |
205 | */ | |
206 | ||
207 | static int __init mtouch_init(void) | |
208 | { | |
209 | serio_register_driver(&mtouch_drv); | |
210 | return 0; | |
211 | } | |
212 | ||
213 | static void __exit mtouch_exit(void) | |
214 | { | |
215 | serio_unregister_driver(&mtouch_drv); | |
216 | } | |
217 | ||
218 | module_init(mtouch_init); | |
219 | module_exit(mtouch_exit); |