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ef53a115 MCC |
1 | /* ir-register.c - handle IR scancode->keycode tables |
2 | * | |
3 | * Copyright (C) 2009 by Mauro Carvalho Chehab <mchehab@redhat.com> | |
4 | */ | |
5 | ||
6 | #include <linux/usb/input.h> | |
7 | ||
8 | #include <media/ir-common.h> | |
9 | ||
10 | /** | |
11 | * ir_getkeycode() - get a keycode at the evdev scancode ->keycode table | |
12 | * @dev: the struct input_dev device descriptor | |
13 | * @scancode: the desired scancode | |
14 | * @keycode: the keycode to be retorned. | |
15 | * | |
16 | * This routine is used to handle evdev EVIOCGKEY ioctl. | |
17 | * If the key is not found, returns -EINVAL, otherwise, returns 0. | |
18 | */ | |
19 | static int ir_getkeycode(struct input_dev *dev, | |
20 | int scancode, int *keycode) | |
21 | { | |
22 | int i; | |
23 | struct ir_scancode_table *rc_tab = input_get_drvdata(dev); | |
24 | struct ir_scancode *keymap = rc_tab->scan; | |
25 | ||
26 | /* See if we can match the raw key code. */ | |
27 | for (i = 0; i < rc_tab->size; i++) | |
28 | if (keymap[i].scancode == scancode) { | |
29 | *keycode = keymap[i].keycode; | |
30 | return 0; | |
31 | } | |
32 | ||
33 | /* | |
34 | * If is there extra space, returns KEY_RESERVED, | |
35 | * otherwise, input core won't let ir_setkeycode | |
36 | * to work | |
37 | */ | |
38 | for (i = 0; i < rc_tab->size; i++) | |
39 | if (keymap[i].keycode == KEY_RESERVED || | |
40 | keymap[i].keycode == KEY_UNKNOWN) { | |
41 | *keycode = KEY_RESERVED; | |
42 | return 0; | |
43 | } | |
44 | ||
45 | return -EINVAL; | |
46 | } | |
47 | ||
48 | /** | |
49 | * ir_setkeycode() - set a keycode at the evdev scancode ->keycode table | |
50 | * @dev: the struct input_dev device descriptor | |
51 | * @scancode: the desired scancode | |
52 | * @keycode: the keycode to be retorned. | |
53 | * | |
54 | * This routine is used to handle evdev EVIOCSKEY ioctl. | |
55 | * There's one caveat here: how can we increase the size of the table? | |
56 | * If the key is not found, returns -EINVAL, otherwise, returns 0. | |
57 | */ | |
58 | static int ir_setkeycode(struct input_dev *dev, | |
59 | int scancode, int keycode) | |
60 | { | |
61 | int i; | |
62 | struct ir_scancode_table *rc_tab = input_get_drvdata(dev); | |
63 | struct ir_scancode *keymap = rc_tab->scan; | |
64 | ||
65 | /* Search if it is replacing an existing keycode */ | |
66 | for (i = 0; i < rc_tab->size; i++) | |
67 | if (keymap[i].scancode == scancode) { | |
68 | keymap[i].keycode = keycode; | |
69 | return 0; | |
70 | } | |
71 | ||
72 | /* Search if is there a clean entry. If so, use it */ | |
73 | for (i = 0; i < rc_tab->size; i++) | |
74 | if (keymap[i].keycode == KEY_RESERVED || | |
75 | keymap[i].keycode == KEY_UNKNOWN) { | |
76 | keymap[i].scancode = scancode; | |
77 | keymap[i].keycode = keycode; | |
78 | return 0; | |
79 | } | |
80 | ||
81 | /* | |
82 | * FIXME: Currently, it is not possible to increase the size of | |
83 | * scancode table. For it to happen, one possibility | |
84 | * would be to allocate a table with key_map_size + 1, | |
85 | * copying data, appending the new key on it, and freeing | |
86 | * the old one - or maybe just allocating some spare space | |
87 | */ | |
88 | ||
89 | return -EINVAL; | |
90 | } | |
91 | ||
92 | /** | |
93 | * ir_g_keycode_from_table() - gets the keycode that corresponds to a scancode | |
94 | * @rc_tab: the ir_scancode_table with the keymap to be used | |
95 | * @scancode: the scancode that we're seeking | |
96 | * | |
97 | * This routine is used by the input routines when a key is pressed at the | |
98 | * IR. The scancode is received and needs to be converted into a keycode. | |
99 | * If the key is not found, it returns KEY_UNKNOWN. Otherwise, returns the | |
100 | * corresponding keycode from the table. | |
101 | */ | |
102 | u32 ir_g_keycode_from_table(struct input_dev *dev, u32 scancode) | |
103 | { | |
104 | int i; | |
105 | struct ir_scancode_table *rc_tab = input_get_drvdata(dev); | |
106 | struct ir_scancode *keymap = rc_tab->scan; | |
107 | ||
108 | for (i = 0; i < rc_tab->size; i++) | |
109 | if (keymap[i].scancode == scancode) { | |
110 | IR_dprintk(1, "%s: scancode 0x%04x keycode 0x%02x\n", | |
111 | dev->name, scancode, keymap[i].keycode); | |
112 | ||
113 | return keymap[i].keycode; | |
114 | } | |
115 | ||
116 | printk(KERN_INFO "%s: unknown key for scancode 0x%04x\n", | |
117 | dev->name, scancode); | |
118 | ||
119 | return KEY_UNKNOWN; | |
120 | } | |
121 | EXPORT_SYMBOL_GPL(ir_g_keycode_from_table); | |
122 | ||
123 | /** | |
124 | * ir_set_keycode_table() - sets the IR keycode table and add the handlers | |
125 | * for keymap table get/set | |
126 | * @input_dev: the struct input_dev descriptor of the device | |
127 | * @rc_tab: the struct ir_scancode_table table of scancode/keymap | |
128 | * | |
129 | * This routine is used to initialize the input infrastructure to work with | |
130 | * an IR. It requires that the caller initializes the input_dev struct with | |
131 | * some fields: name, | |
132 | */ | |
133 | int ir_set_keycode_table(struct input_dev *input_dev, | |
134 | struct ir_scancode_table *rc_tab) | |
135 | { | |
136 | struct ir_scancode *keymap = rc_tab->scan; | |
137 | int i; | |
138 | ||
139 | if (rc_tab->scan == NULL || !rc_tab->size) | |
140 | return -EINVAL; | |
141 | ||
142 | /* set the bits for the keys */ | |
143 | IR_dprintk(1, "key map size: %d\n", rc_tab->size); | |
144 | for (i = 0; i < rc_tab->size; i++) { | |
145 | IR_dprintk(1, "#%d: setting bit for keycode 0x%04x\n", | |
146 | i, keymap[i].keycode); | |
147 | set_bit(keymap[i].keycode, input_dev->keybit); | |
148 | } | |
149 | ||
150 | input_dev->getkeycode = ir_getkeycode; | |
151 | input_dev->setkeycode = ir_setkeycode; | |
152 | input_set_drvdata(input_dev, rc_tab); | |
153 | ||
154 | return 0; | |
155 | } | |
156 | EXPORT_SYMBOL_GPL(ir_set_keycode_table); |