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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
73422392 CN |
2 | /* |
3 | * Sahara TouchIT-213 serial touchscreen driver | |
4 | * | |
5 | * Copyright (c) 2007-2008 Claudio Nieder <private@claudio.ch> | |
6 | * | |
7 | * Based on Touchright driver (drivers/input/touchscreen/touchright.c) | |
8 | * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com> | |
9 | * Copyright (c) 2004 Vojtech Pavlik | |
10 | * and Dan Streetman <ddstreet@ieee.org> | |
11 | */ | |
12 | ||
73422392 CN |
13 | |
14 | #include <linux/errno.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/input.h> | |
19 | #include <linux/serio.h> | |
73422392 CN |
20 | |
21 | #define DRIVER_DESC "Sahara TouchIT-213 serial touchscreen driver" | |
22 | ||
23 | MODULE_AUTHOR("Claudio Nieder <private@claudio.ch>"); | |
24 | MODULE_DESCRIPTION(DRIVER_DESC); | |
25 | MODULE_LICENSE("GPL"); | |
26 | ||
27 | /* | |
28 | * Definitions & global arrays. | |
29 | */ | |
30 | ||
31 | /* | |
32 | * Data is received through COM1 at 9600bit/s,8bit,no parity in packets | |
33 | * of 5 byte each. | |
34 | * | |
35 | * +--------+ +--------+ +--------+ +--------+ +--------+ | |
36 | * |1000000p| |0xxxxxxx| |0xxxxxxx| |0yyyyyyy| |0yyyyyyy| | |
37 | * +--------+ +--------+ +--------+ +--------+ +--------+ | |
38 | * MSB LSB MSB LSB | |
39 | * | |
40 | * The value of p is 1 as long as the screen is touched and 0 when | |
41 | * reporting the location where touching stopped, e.g. where the pen was | |
42 | * lifted from the screen. | |
43 | * | |
44 | * When holding the screen in landscape mode as the BIOS text output is | |
45 | * presented, x is the horizontal axis with values growing from left to | |
46 | * right and y is the vertical axis with values growing from top to | |
47 | * bottom. | |
48 | * | |
49 | * When holding the screen in portrait mode with the Sahara logo in its | |
50 | * correct position, x ist the vertical axis with values growing from | |
51 | * top to bottom and y is the horizontal axis with values growing from | |
52 | * right to left. | |
53 | */ | |
54 | ||
55 | #define T213_FORMAT_TOUCH_BIT 0x01 | |
56 | #define T213_FORMAT_STATUS_BYTE 0x80 | |
57 | #define T213_FORMAT_STATUS_MASK ~T213_FORMAT_TOUCH_BIT | |
58 | ||
59 | /* | |
60 | * On my Sahara Touch-IT 213 I have observed x values from 0 to 0x7f0 | |
61 | * and y values from 0x1d to 0x7e9, so the actual measurement is | |
62 | * probably done with an 11 bit precision. | |
63 | */ | |
64 | #define T213_MIN_XC 0 | |
65 | #define T213_MAX_XC 0x07ff | |
66 | #define T213_MIN_YC 0 | |
67 | #define T213_MAX_YC 0x07ff | |
68 | ||
69 | /* | |
70 | * Per-touchscreen data. | |
71 | */ | |
72 | ||
73 | struct touchit213 { | |
74 | struct input_dev *dev; | |
75 | struct serio *serio; | |
76 | int idx; | |
77 | unsigned char csum; | |
78 | unsigned char data[5]; | |
79 | char phys[32]; | |
80 | }; | |
81 | ||
82 | static irqreturn_t touchit213_interrupt(struct serio *serio, | |
83 | unsigned char data, unsigned int flags) | |
84 | { | |
85 | struct touchit213 *touchit213 = serio_get_drvdata(serio); | |
86 | struct input_dev *dev = touchit213->dev; | |
87 | ||
88 | touchit213->data[touchit213->idx] = data; | |
89 | ||
90 | switch (touchit213->idx++) { | |
91 | case 0: | |
92 | if ((touchit213->data[0] & T213_FORMAT_STATUS_MASK) != | |
93 | T213_FORMAT_STATUS_BYTE) { | |
94 | pr_debug("unsynchronized data: 0x%02x\n", data); | |
95 | touchit213->idx = 0; | |
96 | } | |
97 | break; | |
98 | ||
99 | case 4: | |
100 | touchit213->idx = 0; | |
101 | input_report_abs(dev, ABS_X, | |
102 | (touchit213->data[1] << 7) | touchit213->data[2]); | |
103 | input_report_abs(dev, ABS_Y, | |
104 | (touchit213->data[3] << 7) | touchit213->data[4]); | |
105 | input_report_key(dev, BTN_TOUCH, | |
106 | touchit213->data[0] & T213_FORMAT_TOUCH_BIT); | |
107 | input_sync(dev); | |
108 | break; | |
109 | } | |
110 | ||
111 | return IRQ_HANDLED; | |
112 | } | |
113 | ||
114 | /* | |
115 | * touchit213_disconnect() is the opposite of touchit213_connect() | |
116 | */ | |
117 | ||
118 | static void touchit213_disconnect(struct serio *serio) | |
119 | { | |
120 | struct touchit213 *touchit213 = serio_get_drvdata(serio); | |
121 | ||
122 | input_get_device(touchit213->dev); | |
123 | input_unregister_device(touchit213->dev); | |
124 | serio_close(serio); | |
125 | serio_set_drvdata(serio, NULL); | |
126 | input_put_device(touchit213->dev); | |
127 | kfree(touchit213); | |
128 | } | |
129 | ||
130 | /* | |
131 | * touchit213_connect() is the routine that is called when someone adds a | |
132 | * new serio device that supports the Touchright protocol and registers it as | |
133 | * an input device. | |
134 | */ | |
135 | ||
136 | static int touchit213_connect(struct serio *serio, struct serio_driver *drv) | |
137 | { | |
138 | struct touchit213 *touchit213; | |
139 | struct input_dev *input_dev; | |
140 | int err; | |
141 | ||
f81d03d4 | 142 | touchit213 = kzalloc(sizeof(*touchit213), GFP_KERNEL); |
73422392 CN |
143 | input_dev = input_allocate_device(); |
144 | if (!touchit213 || !input_dev) { | |
145 | err = -ENOMEM; | |
146 | goto fail1; | |
147 | } | |
148 | ||
149 | touchit213->serio = serio; | |
150 | touchit213->dev = input_dev; | |
151 | snprintf(touchit213->phys, sizeof(touchit213->phys), | |
152 | "%s/input0", serio->phys); | |
153 | ||
154 | input_dev->name = "Sahara Touch-iT213 Serial TouchScreen"; | |
155 | input_dev->phys = touchit213->phys; | |
156 | input_dev->id.bustype = BUS_RS232; | |
157 | input_dev->id.vendor = SERIO_TOUCHIT213; | |
158 | input_dev->id.product = 0; | |
159 | input_dev->id.version = 0x0100; | |
160 | input_dev->dev.parent = &serio->dev; | |
161 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); | |
162 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
163 | input_set_abs_params(touchit213->dev, ABS_X, | |
164 | T213_MIN_XC, T213_MAX_XC, 0, 0); | |
165 | input_set_abs_params(touchit213->dev, ABS_Y, | |
166 | T213_MIN_YC, T213_MAX_YC, 0, 0); | |
167 | ||
168 | serio_set_drvdata(serio, touchit213); | |
169 | ||
170 | err = serio_open(serio, drv); | |
171 | if (err) | |
172 | goto fail2; | |
173 | ||
174 | err = input_register_device(touchit213->dev); | |
175 | if (err) | |
176 | goto fail3; | |
177 | ||
178 | return 0; | |
179 | ||
180 | fail3: serio_close(serio); | |
181 | fail2: serio_set_drvdata(serio, NULL); | |
182 | fail1: input_free_device(input_dev); | |
183 | kfree(touchit213); | |
184 | return err; | |
185 | } | |
186 | ||
187 | /* | |
188 | * The serio driver structure. | |
189 | */ | |
190 | ||
b84704c3 | 191 | static const struct serio_device_id touchit213_serio_ids[] = { |
73422392 CN |
192 | { |
193 | .type = SERIO_RS232, | |
194 | .proto = SERIO_TOUCHIT213, | |
195 | .id = SERIO_ANY, | |
196 | .extra = SERIO_ANY, | |
197 | }, | |
198 | { 0 } | |
199 | }; | |
200 | ||
201 | MODULE_DEVICE_TABLE(serio, touchit213_serio_ids); | |
202 | ||
203 | static struct serio_driver touchit213_drv = { | |
204 | .driver = { | |
205 | .name = "touchit213", | |
206 | }, | |
207 | .description = DRIVER_DESC, | |
208 | .id_table = touchit213_serio_ids, | |
209 | .interrupt = touchit213_interrupt, | |
210 | .connect = touchit213_connect, | |
211 | .disconnect = touchit213_disconnect, | |
212 | }; | |
213 | ||
65ac9f7a | 214 | module_serio_driver(touchit213_drv); |