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3cadd2d9 RL |
1 | /* |
2 | * iNexio serial touchscreen driver | |
3 | * | |
4 | * Copyright (c) 2008 Richard Lemon | |
5 | * Based on the mtouch driver (c) Vojtech Pavlik and Dan Streetman | |
6 | * | |
7 | */ | |
8 | ||
9 | /* | |
10 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms of the GNU General Public License version 2 as published by | |
12 | * the Free Software Foundation. | |
13 | */ | |
14 | ||
15 | /* | |
16 | * 2008/06/19 Richard Lemon <richard@codelemon.com> | |
17 | * Copied mtouch.c and edited for iNexio protocol | |
18 | */ | |
19 | ||
20 | #include <linux/errno.h> | |
21 | #include <linux/kernel.h> | |
22 | #include <linux/module.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/input.h> | |
25 | #include <linux/serio.h> | |
3cadd2d9 RL |
26 | |
27 | #define DRIVER_DESC "iNexio serial touchscreen driver" | |
28 | ||
29 | MODULE_AUTHOR("Richard Lemon <richard@codelemon.com>"); | |
30 | MODULE_DESCRIPTION(DRIVER_DESC); | |
31 | MODULE_LICENSE("GPL"); | |
32 | ||
33 | /* | |
34 | * Definitions & global arrays. | |
35 | */ | |
36 | ||
37 | #define INEXIO_FORMAT_TOUCH_BIT 0x01 | |
38 | #define INEXIO_FORMAT_LENGTH 5 | |
39 | #define INEXIO_RESPONSE_BEGIN_BYTE 0x80 | |
40 | ||
41 | /* todo: check specs for max length of all responses */ | |
42 | #define INEXIO_MAX_LENGTH 16 | |
43 | ||
44 | #define INEXIO_MIN_XC 0 | |
45 | #define INEXIO_MAX_XC 0x3fff | |
46 | #define INEXIO_MIN_YC 0 | |
47 | #define INEXIO_MAX_YC 0x3fff | |
48 | ||
49 | #define INEXIO_GET_XC(data) (((data[1])<<7) | data[2]) | |
50 | #define INEXIO_GET_YC(data) (((data[3])<<7) | data[4]) | |
51 | #define INEXIO_GET_TOUCHED(data) (INEXIO_FORMAT_TOUCH_BIT & data[0]) | |
52 | ||
53 | /* | |
54 | * Per-touchscreen data. | |
55 | */ | |
56 | ||
57 | struct inexio { | |
58 | struct input_dev *dev; | |
59 | struct serio *serio; | |
60 | int idx; | |
61 | unsigned char data[INEXIO_MAX_LENGTH]; | |
62 | char phys[32]; | |
63 | }; | |
64 | ||
65 | static void inexio_process_data(struct inexio *pinexio) | |
66 | { | |
67 | struct input_dev *dev = pinexio->dev; | |
68 | ||
69 | if (INEXIO_FORMAT_LENGTH == ++pinexio->idx) { | |
70 | input_report_abs(dev, ABS_X, INEXIO_GET_XC(pinexio->data)); | |
71 | input_report_abs(dev, ABS_Y, INEXIO_GET_YC(pinexio->data)); | |
72 | input_report_key(dev, BTN_TOUCH, INEXIO_GET_TOUCHED(pinexio->data)); | |
73 | input_sync(dev); | |
74 | ||
75 | pinexio->idx = 0; | |
76 | } | |
77 | } | |
78 | ||
79 | static irqreturn_t inexio_interrupt(struct serio *serio, | |
80 | unsigned char data, unsigned int flags) | |
81 | { | |
82 | struct inexio* pinexio = serio_get_drvdata(serio); | |
83 | ||
84 | pinexio->data[pinexio->idx] = data; | |
85 | ||
86 | if (INEXIO_RESPONSE_BEGIN_BYTE&pinexio->data[0]) | |
87 | inexio_process_data(pinexio); | |
88 | else | |
89 | printk(KERN_DEBUG "inexio.c: unknown/unsynchronized data from device, byte %x\n",pinexio->data[0]); | |
90 | ||
91 | return IRQ_HANDLED; | |
92 | } | |
93 | ||
94 | /* | |
95 | * inexio_disconnect() is the opposite of inexio_connect() | |
96 | */ | |
97 | ||
98 | static void inexio_disconnect(struct serio *serio) | |
99 | { | |
100 | struct inexio* pinexio = serio_get_drvdata(serio); | |
101 | ||
102 | input_get_device(pinexio->dev); | |
103 | input_unregister_device(pinexio->dev); | |
104 | serio_close(serio); | |
105 | serio_set_drvdata(serio, NULL); | |
106 | input_put_device(pinexio->dev); | |
107 | kfree(pinexio); | |
108 | } | |
109 | ||
110 | /* | |
111 | * inexio_connect() is the routine that is called when someone adds a | |
112 | * new serio device that supports iNexio protocol and registers it as | |
113 | * an input device. This is usually accomplished using inputattach. | |
114 | */ | |
115 | ||
116 | static int inexio_connect(struct serio *serio, struct serio_driver *drv) | |
117 | { | |
118 | struct inexio *pinexio; | |
119 | struct input_dev *input_dev; | |
120 | int err; | |
121 | ||
122 | pinexio = kzalloc(sizeof(struct inexio), GFP_KERNEL); | |
123 | input_dev = input_allocate_device(); | |
124 | if (!pinexio || !input_dev) { | |
125 | err = -ENOMEM; | |
126 | goto fail1; | |
127 | } | |
128 | ||
129 | pinexio->serio = serio; | |
130 | pinexio->dev = input_dev; | |
131 | snprintf(pinexio->phys, sizeof(pinexio->phys), "%s/input0", serio->phys); | |
132 | ||
133 | input_dev->name = "iNexio Serial TouchScreen"; | |
134 | input_dev->phys = pinexio->phys; | |
135 | input_dev->id.bustype = BUS_RS232; | |
136 | input_dev->id.vendor = SERIO_INEXIO; | |
137 | input_dev->id.product = 0; | |
138 | input_dev->id.version = 0x0001; | |
139 | input_dev->dev.parent = &serio->dev; | |
140 | input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS); | |
141 | input_dev->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH); | |
142 | input_set_abs_params(pinexio->dev, ABS_X, INEXIO_MIN_XC, INEXIO_MAX_XC, 0, 0); | |
143 | input_set_abs_params(pinexio->dev, ABS_Y, INEXIO_MIN_YC, INEXIO_MAX_YC, 0, 0); | |
144 | ||
145 | serio_set_drvdata(serio, pinexio); | |
146 | ||
147 | err = serio_open(serio, drv); | |
148 | if (err) | |
149 | goto fail2; | |
150 | ||
151 | err = input_register_device(pinexio->dev); | |
152 | if (err) | |
153 | goto fail3; | |
154 | ||
155 | return 0; | |
156 | ||
157 | fail3: serio_close(serio); | |
158 | fail2: serio_set_drvdata(serio, NULL); | |
159 | fail1: input_free_device(input_dev); | |
160 | kfree(pinexio); | |
161 | return err; | |
162 | } | |
163 | ||
164 | /* | |
165 | * The serio driver structure. | |
166 | */ | |
167 | ||
168 | static struct serio_device_id inexio_serio_ids[] = { | |
169 | { | |
170 | .type = SERIO_RS232, | |
171 | .proto = SERIO_INEXIO, | |
172 | .id = SERIO_ANY, | |
173 | .extra = SERIO_ANY, | |
174 | }, | |
175 | { 0 } | |
176 | }; | |
177 | ||
178 | MODULE_DEVICE_TABLE(serio, inexio_serio_ids); | |
179 | ||
180 | static struct serio_driver inexio_drv = { | |
181 | .driver = { | |
182 | .name = "inexio", | |
183 | }, | |
184 | .description = DRIVER_DESC, | |
185 | .id_table = inexio_serio_ids, | |
186 | .interrupt = inexio_interrupt, | |
187 | .connect = inexio_connect, | |
188 | .disconnect = inexio_disconnect, | |
189 | }; | |
190 | ||
65ac9f7a | 191 | module_serio_driver(inexio_drv); |