1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * Touchright serial touchscreen driver |
4 | * |
5 | * Copyright (c) 2006 Rick Koch <n1gp@hotmail.com> |
6 | * |
7 | * Based on MicroTouch driver (drivers/input/touchscreen/mtouch.c) |
8 | * Copyright (c) 2004 Vojtech Pavlik |
9 | * and Dan Streetman <ddstreet@ieee.org> |
10 | */ |
11 | |
12 | |
13 | #include <linux/errno.h> |
14 | #include <linux/kernel.h> |
15 | #include <linux/module.h> |
16 | #include <linux/slab.h> |
17 | #include <linux/input.h> |
18 | #include <linux/serio.h> |
19 | |
20 | #define DRIVER_DESC "Touchright serial touchscreen driver" |
21 | |
22 | MODULE_AUTHOR("Rick Koch <n1gp@hotmail.com>" ); |
23 | MODULE_DESCRIPTION(DRIVER_DESC); |
24 | MODULE_LICENSE("GPL" ); |
25 | |
26 | /* |
27 | * Definitions & global arrays. |
28 | */ |
29 | |
30 | #define TR_FORMAT_TOUCH_BIT 0x01 |
31 | #define TR_FORMAT_STATUS_BYTE 0x40 |
32 | #define TR_FORMAT_STATUS_MASK ~TR_FORMAT_TOUCH_BIT |
33 | |
34 | #define TR_LENGTH 5 |
35 | |
36 | #define TR_MIN_XC 0 |
37 | #define TR_MAX_XC 0x1ff |
38 | #define TR_MIN_YC 0 |
39 | #define TR_MAX_YC 0x1ff |
40 | |
41 | /* |
42 | * Per-touchscreen data. |
43 | */ |
44 | |
45 | struct tr { |
46 | struct input_dev *dev; |
47 | struct serio *serio; |
48 | int idx; |
49 | unsigned char data[TR_LENGTH]; |
50 | char phys[32]; |
51 | }; |
52 | |
53 | static irqreturn_t tr_interrupt(struct serio *serio, |
54 | unsigned char data, unsigned int flags) |
55 | { |
56 | struct tr *tr = serio_get_drvdata(serio); |
57 | struct input_dev *dev = tr->dev; |
58 | |
59 | tr->data[tr->idx] = data; |
60 | |
61 | if ((tr->data[0] & TR_FORMAT_STATUS_MASK) == TR_FORMAT_STATUS_BYTE) { |
62 | if (++tr->idx == TR_LENGTH) { |
63 | input_report_abs(dev, ABS_X, |
64 | value: (tr->data[1] << 5) | (tr->data[2] >> 1)); |
65 | input_report_abs(dev, ABS_Y, |
66 | value: (tr->data[3] << 5) | (tr->data[4] >> 1)); |
67 | input_report_key(dev, BTN_TOUCH, |
68 | value: tr->data[0] & TR_FORMAT_TOUCH_BIT); |
69 | input_sync(dev); |
70 | tr->idx = 0; |
71 | } |
72 | } |
73 | |
74 | return IRQ_HANDLED; |
75 | } |
76 | |
77 | /* |
78 | * tr_disconnect() is the opposite of tr_connect() |
79 | */ |
80 | |
81 | static void tr_disconnect(struct serio *serio) |
82 | { |
83 | struct tr *tr = serio_get_drvdata(serio); |
84 | |
85 | input_get_device(dev: tr->dev); |
86 | input_unregister_device(tr->dev); |
87 | serio_close(serio); |
88 | serio_set_drvdata(serio, NULL); |
89 | input_put_device(dev: tr->dev); |
90 | kfree(objp: tr); |
91 | } |
92 | |
93 | /* |
94 | * tr_connect() is the routine that is called when someone adds a |
95 | * new serio device that supports the Touchright protocol and registers it as |
96 | * an input device. |
97 | */ |
98 | |
99 | static int tr_connect(struct serio *serio, struct serio_driver *drv) |
100 | { |
101 | struct tr *tr; |
102 | struct input_dev *input_dev; |
103 | int err; |
104 | |
105 | tr = kzalloc(size: sizeof(struct tr), GFP_KERNEL); |
106 | input_dev = input_allocate_device(); |
107 | if (!tr || !input_dev) { |
108 | err = -ENOMEM; |
109 | goto fail1; |
110 | } |
111 | |
112 | tr->serio = serio; |
113 | tr->dev = input_dev; |
114 | snprintf(buf: tr->phys, size: sizeof(tr->phys), fmt: "%s/input0" , serio->phys); |
115 | |
116 | input_dev->name = "Touchright Serial TouchScreen" ; |
117 | input_dev->phys = tr->phys; |
118 | input_dev->id.bustype = BUS_RS232; |
119 | input_dev->id.vendor = SERIO_TOUCHRIGHT; |
120 | input_dev->id.product = 0; |
121 | input_dev->id.version = 0x0100; |
122 | input_dev->dev.parent = &serio->dev; |
123 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); |
124 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); |
125 | input_set_abs_params(dev: tr->dev, ABS_X, TR_MIN_XC, TR_MAX_XC, fuzz: 0, flat: 0); |
126 | input_set_abs_params(dev: tr->dev, ABS_Y, TR_MIN_YC, TR_MAX_YC, fuzz: 0, flat: 0); |
127 | |
128 | serio_set_drvdata(serio, data: tr); |
129 | |
130 | err = serio_open(serio, drv); |
131 | if (err) |
132 | goto fail2; |
133 | |
134 | err = input_register_device(tr->dev); |
135 | if (err) |
136 | goto fail3; |
137 | |
138 | return 0; |
139 | |
140 | fail3: serio_close(serio); |
141 | fail2: serio_set_drvdata(serio, NULL); |
142 | fail1: input_free_device(dev: input_dev); |
143 | kfree(objp: tr); |
144 | return err; |
145 | } |
146 | |
147 | /* |
148 | * The serio driver structure. |
149 | */ |
150 | |
151 | static const struct serio_device_id tr_serio_ids[] = { |
152 | { |
153 | .type = SERIO_RS232, |
154 | .proto = SERIO_TOUCHRIGHT, |
155 | .id = SERIO_ANY, |
156 | .extra = SERIO_ANY, |
157 | }, |
158 | { 0 } |
159 | }; |
160 | |
161 | MODULE_DEVICE_TABLE(serio, tr_serio_ids); |
162 | |
163 | static struct serio_driver tr_drv = { |
164 | .driver = { |
165 | .name = "touchright" , |
166 | }, |
167 | .description = DRIVER_DESC, |
168 | .id_table = tr_serio_ids, |
169 | .interrupt = tr_interrupt, |
170 | .connect = tr_connect, |
171 | .disconnect = tr_disconnect, |
172 | }; |
173 | |
174 | module_serio_driver(tr_drv); |
175 | |