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73422392 CN |
1 | /* |
2 | * Sahara TouchIT-213 serial touchscreen driver | |
3 | * | |
4 | * Copyright (c) 2007-2008 Claudio Nieder <private@claudio.ch> | |
5 | * | |
6 | * Based on Touchright driver (drivers/input/touchscreen/touchright.c) | |
7 | * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com> | |
8 | * Copyright (c) 2004 Vojtech Pavlik | |
9 | * and Dan Streetman <ddstreet@ieee.org> | |
10 | */ | |
11 | ||
12 | /* | |
13 | * This program is free software; you can redistribute it and/or modify it | |
14 | * under the terms of the GNU General Public License version 2 as published | |
15 | * by the Free Software Foundation. | |
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> | |
73422392 CN |
24 | |
25 | #define DRIVER_DESC "Sahara TouchIT-213 serial touchscreen driver" | |
26 | ||
27 | MODULE_AUTHOR("Claudio Nieder <private@claudio.ch>"); | |
28 | MODULE_DESCRIPTION(DRIVER_DESC); | |
29 | MODULE_LICENSE("GPL"); | |
30 | ||
31 | /* | |
32 | * Definitions & global arrays. | |
33 | */ | |
34 | ||
35 | /* | |
36 | * Data is received through COM1 at 9600bit/s,8bit,no parity in packets | |
37 | * of 5 byte each. | |
38 | * | |
39 | * +--------+ +--------+ +--------+ +--------+ +--------+ | |
40 | * |1000000p| |0xxxxxxx| |0xxxxxxx| |0yyyyyyy| |0yyyyyyy| | |
41 | * +--------+ +--------+ +--------+ +--------+ +--------+ | |
42 | * MSB LSB MSB LSB | |
43 | * | |
44 | * The value of p is 1 as long as the screen is touched and 0 when | |
45 | * reporting the location where touching stopped, e.g. where the pen was | |
46 | * lifted from the screen. | |
47 | * | |
48 | * When holding the screen in landscape mode as the BIOS text output is | |
49 | * presented, x is the horizontal axis with values growing from left to | |
50 | * right and y is the vertical axis with values growing from top to | |
51 | * bottom. | |
52 | * | |
53 | * When holding the screen in portrait mode with the Sahara logo in its | |
54 | * correct position, x ist the vertical axis with values growing from | |
55 | * top to bottom and y is the horizontal axis with values growing from | |
56 | * right to left. | |
57 | */ | |
58 | ||
59 | #define T213_FORMAT_TOUCH_BIT 0x01 | |
60 | #define T213_FORMAT_STATUS_BYTE 0x80 | |
61 | #define T213_FORMAT_STATUS_MASK ~T213_FORMAT_TOUCH_BIT | |
62 | ||
63 | /* | |
64 | * On my Sahara Touch-IT 213 I have observed x values from 0 to 0x7f0 | |
65 | * and y values from 0x1d to 0x7e9, so the actual measurement is | |
66 | * probably done with an 11 bit precision. | |
67 | */ | |
68 | #define T213_MIN_XC 0 | |
69 | #define T213_MAX_XC 0x07ff | |
70 | #define T213_MIN_YC 0 | |
71 | #define T213_MAX_YC 0x07ff | |
72 | ||
73 | /* | |
74 | * Per-touchscreen data. | |
75 | */ | |
76 | ||
77 | struct touchit213 { | |
78 | struct input_dev *dev; | |
79 | struct serio *serio; | |
80 | int idx; | |
81 | unsigned char csum; | |
82 | unsigned char data[5]; | |
83 | char phys[32]; | |
84 | }; | |
85 | ||
86 | static irqreturn_t touchit213_interrupt(struct serio *serio, | |
87 | unsigned char data, unsigned int flags) | |
88 | { | |
89 | struct touchit213 *touchit213 = serio_get_drvdata(serio); | |
90 | struct input_dev *dev = touchit213->dev; | |
91 | ||
92 | touchit213->data[touchit213->idx] = data; | |
93 | ||
94 | switch (touchit213->idx++) { | |
95 | case 0: | |
96 | if ((touchit213->data[0] & T213_FORMAT_STATUS_MASK) != | |
97 | T213_FORMAT_STATUS_BYTE) { | |
98 | pr_debug("unsynchronized data: 0x%02x\n", data); | |
99 | touchit213->idx = 0; | |
100 | } | |
101 | break; | |
102 | ||
103 | case 4: | |
104 | touchit213->idx = 0; | |
105 | input_report_abs(dev, ABS_X, | |
106 | (touchit213->data[1] << 7) | touchit213->data[2]); | |
107 | input_report_abs(dev, ABS_Y, | |
108 | (touchit213->data[3] << 7) | touchit213->data[4]); | |
109 | input_report_key(dev, BTN_TOUCH, | |
110 | touchit213->data[0] & T213_FORMAT_TOUCH_BIT); | |
111 | input_sync(dev); | |
112 | break; | |
113 | } | |
114 | ||
115 | return IRQ_HANDLED; | |
116 | } | |
117 | ||
118 | /* | |
119 | * touchit213_disconnect() is the opposite of touchit213_connect() | |
120 | */ | |
121 | ||
122 | static void touchit213_disconnect(struct serio *serio) | |
123 | { | |
124 | struct touchit213 *touchit213 = serio_get_drvdata(serio); | |
125 | ||
126 | input_get_device(touchit213->dev); | |
127 | input_unregister_device(touchit213->dev); | |
128 | serio_close(serio); | |
129 | serio_set_drvdata(serio, NULL); | |
130 | input_put_device(touchit213->dev); | |
131 | kfree(touchit213); | |
132 | } | |
133 | ||
134 | /* | |
135 | * touchit213_connect() is the routine that is called when someone adds a | |
136 | * new serio device that supports the Touchright protocol and registers it as | |
137 | * an input device. | |
138 | */ | |
139 | ||
140 | static int touchit213_connect(struct serio *serio, struct serio_driver *drv) | |
141 | { | |
142 | struct touchit213 *touchit213; | |
143 | struct input_dev *input_dev; | |
144 | int err; | |
145 | ||
146 | touchit213 = kzalloc(sizeof(struct touchit213), GFP_KERNEL); | |
147 | input_dev = input_allocate_device(); | |
148 | if (!touchit213 || !input_dev) { | |
149 | err = -ENOMEM; | |
150 | goto fail1; | |
151 | } | |
152 | ||
153 | touchit213->serio = serio; | |
154 | touchit213->dev = input_dev; | |
155 | snprintf(touchit213->phys, sizeof(touchit213->phys), | |
156 | "%s/input0", serio->phys); | |
157 | ||
158 | input_dev->name = "Sahara Touch-iT213 Serial TouchScreen"; | |
159 | input_dev->phys = touchit213->phys; | |
160 | input_dev->id.bustype = BUS_RS232; | |
161 | input_dev->id.vendor = SERIO_TOUCHIT213; | |
162 | input_dev->id.product = 0; | |
163 | input_dev->id.version = 0x0100; | |
164 | input_dev->dev.parent = &serio->dev; | |
165 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); | |
166 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
167 | input_set_abs_params(touchit213->dev, ABS_X, | |
168 | T213_MIN_XC, T213_MAX_XC, 0, 0); | |
169 | input_set_abs_params(touchit213->dev, ABS_Y, | |
170 | T213_MIN_YC, T213_MAX_YC, 0, 0); | |
171 | ||
172 | serio_set_drvdata(serio, touchit213); | |
173 | ||
174 | err = serio_open(serio, drv); | |
175 | if (err) | |
176 | goto fail2; | |
177 | ||
178 | err = input_register_device(touchit213->dev); | |
179 | if (err) | |
180 | goto fail3; | |
181 | ||
182 | return 0; | |
183 | ||
184 | fail3: serio_close(serio); | |
185 | fail2: serio_set_drvdata(serio, NULL); | |
186 | fail1: input_free_device(input_dev); | |
187 | kfree(touchit213); | |
188 | return err; | |
189 | } | |
190 | ||
191 | /* | |
192 | * The serio driver structure. | |
193 | */ | |
194 | ||
195 | static struct serio_device_id touchit213_serio_ids[] = { | |
196 | { | |
197 | .type = SERIO_RS232, | |
198 | .proto = SERIO_TOUCHIT213, | |
199 | .id = SERIO_ANY, | |
200 | .extra = SERIO_ANY, | |
201 | }, | |
202 | { 0 } | |
203 | }; | |
204 | ||
205 | MODULE_DEVICE_TABLE(serio, touchit213_serio_ids); | |
206 | ||
207 | static struct serio_driver touchit213_drv = { | |
208 | .driver = { | |
209 | .name = "touchit213", | |
210 | }, | |
211 | .description = DRIVER_DESC, | |
212 | .id_table = touchit213_serio_ids, | |
213 | .interrupt = touchit213_interrupt, | |
214 | .connect = touchit213_connect, | |
215 | .disconnect = touchit213_disconnect, | |
216 | }; | |
217 | ||
65ac9f7a | 218 | module_serio_driver(touchit213_drv); |