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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 | ||
f6fc5049 MCC |
10 | #define IR_TAB_MIN_SIZE 32 |
11 | ||
12 | /** | |
13 | * ir_roundup_tablesize() - gets an optimum value for the table size | |
14 | * @n_elems: minimum number of entries to store keycodes | |
15 | * | |
16 | * This routine is used to choose the keycode table size. | |
17 | * | |
18 | * In order to have some empty space for new keycodes, | |
19 | * and knowing in advance that kmalloc allocates only power of two | |
20 | * segments, it optimizes the allocated space to have some spare space | |
21 | * for those new keycodes by using the maximum number of entries that | |
22 | * will be effectively be allocated by kmalloc. | |
23 | * In order to reduce the quantity of table resizes, it has a minimum | |
24 | * table size of IR_TAB_MIN_SIZE. | |
25 | */ | |
26 | int ir_roundup_tablesize(int n_elems) | |
27 | { | |
28 | size_t size; | |
29 | ||
30 | if (n_elems < IR_TAB_MIN_SIZE) | |
31 | n_elems = IR_TAB_MIN_SIZE; | |
32 | ||
33 | /* | |
34 | * As kmalloc only allocates sizes of power of two, get as | |
35 | * much entries as possible for the allocated memory segment | |
36 | */ | |
37 | size = roundup_pow_of_two(n_elems * sizeof(struct ir_scancode)); | |
38 | n_elems = size / sizeof(struct ir_scancode); | |
39 | ||
40 | return n_elems; | |
41 | } | |
42 | ||
43 | /** | |
44 | * ir_copy_table() - copies a keytable, discarding the unused entries | |
45 | * @destin: destin table | |
46 | * @origin: origin table | |
47 | * | |
48 | * Copies all entries where the keycode is not KEY_UNKNOWN/KEY_RESERVED | |
49 | */ | |
50 | ||
51 | int ir_copy_table(struct ir_scancode_table *destin, | |
52 | const struct ir_scancode_table *origin) | |
53 | { | |
54 | int i, j = 0; | |
55 | ||
56 | for (i = 0; i < origin->size; i++) { | |
57 | if (origin->scan[i].keycode != KEY_UNKNOWN && | |
58 | origin->scan[i].keycode != KEY_RESERVED) { | |
59 | memcpy(&destin->scan[j], &origin->scan[i], | |
60 | sizeof(struct ir_scancode)); | |
61 | j++; | |
62 | } | |
63 | } | |
64 | destin->size = j; | |
65 | ||
66 | IR_dprintk(1, "Copied %d scancodes to the new keycode table\n", j); | |
67 | ||
68 | return 0; | |
69 | } | |
70 | ||
71 | ||
ef53a115 MCC |
72 | /** |
73 | * ir_getkeycode() - get a keycode at the evdev scancode ->keycode table | |
74 | * @dev: the struct input_dev device descriptor | |
75 | * @scancode: the desired scancode | |
76 | * @keycode: the keycode to be retorned. | |
77 | * | |
78 | * This routine is used to handle evdev EVIOCGKEY ioctl. | |
79 | * If the key is not found, returns -EINVAL, otherwise, returns 0. | |
80 | */ | |
81 | static int ir_getkeycode(struct input_dev *dev, | |
82 | int scancode, int *keycode) | |
83 | { | |
84 | int i; | |
85 | struct ir_scancode_table *rc_tab = input_get_drvdata(dev); | |
86 | struct ir_scancode *keymap = rc_tab->scan; | |
87 | ||
88 | /* See if we can match the raw key code. */ | |
89 | for (i = 0; i < rc_tab->size; i++) | |
90 | if (keymap[i].scancode == scancode) { | |
91 | *keycode = keymap[i].keycode; | |
92 | return 0; | |
93 | } | |
94 | ||
95 | /* | |
96 | * If is there extra space, returns KEY_RESERVED, | |
97 | * otherwise, input core won't let ir_setkeycode | |
98 | * to work | |
99 | */ | |
100 | for (i = 0; i < rc_tab->size; i++) | |
101 | if (keymap[i].keycode == KEY_RESERVED || | |
102 | keymap[i].keycode == KEY_UNKNOWN) { | |
103 | *keycode = KEY_RESERVED; | |
104 | return 0; | |
105 | } | |
106 | ||
107 | return -EINVAL; | |
108 | } | |
109 | ||
110 | /** | |
111 | * ir_setkeycode() - set a keycode at the evdev scancode ->keycode table | |
112 | * @dev: the struct input_dev device descriptor | |
113 | * @scancode: the desired scancode | |
114 | * @keycode: the keycode to be retorned. | |
115 | * | |
116 | * This routine is used to handle evdev EVIOCSKEY ioctl. | |
117 | * There's one caveat here: how can we increase the size of the table? | |
118 | * If the key is not found, returns -EINVAL, otherwise, returns 0. | |
119 | */ | |
120 | static int ir_setkeycode(struct input_dev *dev, | |
121 | int scancode, int keycode) | |
122 | { | |
123 | int i; | |
124 | struct ir_scancode_table *rc_tab = input_get_drvdata(dev); | |
125 | struct ir_scancode *keymap = rc_tab->scan; | |
126 | ||
127 | /* Search if it is replacing an existing keycode */ | |
128 | for (i = 0; i < rc_tab->size; i++) | |
129 | if (keymap[i].scancode == scancode) { | |
130 | keymap[i].keycode = keycode; | |
131 | return 0; | |
132 | } | |
133 | ||
134 | /* Search if is there a clean entry. If so, use it */ | |
135 | for (i = 0; i < rc_tab->size; i++) | |
136 | if (keymap[i].keycode == KEY_RESERVED || | |
137 | keymap[i].keycode == KEY_UNKNOWN) { | |
138 | keymap[i].scancode = scancode; | |
139 | keymap[i].keycode = keycode; | |
140 | return 0; | |
141 | } | |
142 | ||
143 | /* | |
144 | * FIXME: Currently, it is not possible to increase the size of | |
145 | * scancode table. For it to happen, one possibility | |
146 | * would be to allocate a table with key_map_size + 1, | |
147 | * copying data, appending the new key on it, and freeing | |
148 | * the old one - or maybe just allocating some spare space | |
149 | */ | |
150 | ||
151 | return -EINVAL; | |
152 | } | |
153 | ||
154 | /** | |
155 | * ir_g_keycode_from_table() - gets the keycode that corresponds to a scancode | |
156 | * @rc_tab: the ir_scancode_table with the keymap to be used | |
157 | * @scancode: the scancode that we're seeking | |
158 | * | |
159 | * This routine is used by the input routines when a key is pressed at the | |
160 | * IR. The scancode is received and needs to be converted into a keycode. | |
161 | * If the key is not found, it returns KEY_UNKNOWN. Otherwise, returns the | |
162 | * corresponding keycode from the table. | |
163 | */ | |
164 | u32 ir_g_keycode_from_table(struct input_dev *dev, u32 scancode) | |
165 | { | |
166 | int i; | |
167 | struct ir_scancode_table *rc_tab = input_get_drvdata(dev); | |
168 | struct ir_scancode *keymap = rc_tab->scan; | |
169 | ||
170 | for (i = 0; i < rc_tab->size; i++) | |
171 | if (keymap[i].scancode == scancode) { | |
172 | IR_dprintk(1, "%s: scancode 0x%04x keycode 0x%02x\n", | |
173 | dev->name, scancode, keymap[i].keycode); | |
174 | ||
175 | return keymap[i].keycode; | |
176 | } | |
177 | ||
178 | printk(KERN_INFO "%s: unknown key for scancode 0x%04x\n", | |
179 | dev->name, scancode); | |
180 | ||
181 | return KEY_UNKNOWN; | |
182 | } | |
ef53a115 MCC |
183 | |
184 | /** | |
185 | * ir_set_keycode_table() - sets the IR keycode table and add the handlers | |
186 | * for keymap table get/set | |
187 | * @input_dev: the struct input_dev descriptor of the device | |
188 | * @rc_tab: the struct ir_scancode_table table of scancode/keymap | |
189 | * | |
190 | * This routine is used to initialize the input infrastructure to work with | |
191 | * an IR. It requires that the caller initializes the input_dev struct with | |
192 | * some fields: name, | |
193 | */ | |
194 | int ir_set_keycode_table(struct input_dev *input_dev, | |
195 | struct ir_scancode_table *rc_tab) | |
196 | { | |
197 | struct ir_scancode *keymap = rc_tab->scan; | |
198 | int i; | |
199 | ||
200 | if (rc_tab->scan == NULL || !rc_tab->size) | |
201 | return -EINVAL; | |
202 | ||
203 | /* set the bits for the keys */ | |
204 | IR_dprintk(1, "key map size: %d\n", rc_tab->size); | |
205 | for (i = 0; i < rc_tab->size; i++) { | |
206 | IR_dprintk(1, "#%d: setting bit for keycode 0x%04x\n", | |
207 | i, keymap[i].keycode); | |
208 | set_bit(keymap[i].keycode, input_dev->keybit); | |
209 | } | |
210 | ||
211 | input_dev->getkeycode = ir_getkeycode; | |
212 | input_dev->setkeycode = ir_setkeycode; | |
213 | input_set_drvdata(input_dev, rc_tab); | |
214 | ||
215 | return 0; | |
216 | } | |
f6fc5049 MCC |
217 | |
218 | void ir_input_free(struct input_dev *dev) | |
219 | { | |
220 | struct ir_scancode_table *rc_tab = input_get_drvdata(dev); | |
221 | ||
222 | IR_dprintk(1, "Freed keycode table\n"); | |
223 | ||
224 | rc_tab->size = 0; | |
225 | kfree(rc_tab->scan); | |
226 | rc_tab->scan = NULL; | |
227 | } | |
228 | EXPORT_SYMBOL_GPL(ir_input_free); | |
229 |