dm raid1: switch rh_in_sync to blocking in do_reads
[linux-2.6/mini2440.git] / drivers / media / common / ir-functions.c
blobfcb194135627f9e32bb01f8f33db53e4b2a41fdd
1 /*
3 * some common structs and functions to handle infrared remotes via
4 * input layer ...
6 * (c) 2003 Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include <linux/module.h>
24 #include <linux/moduleparam.h>
25 #include <linux/string.h>
26 #include <linux/jiffies.h>
27 #include <media/ir-common.h>
29 /* -------------------------------------------------------------------------- */
31 MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");
32 MODULE_LICENSE("GPL");
34 static int repeat = 1;
35 module_param(repeat, int, 0444);
36 MODULE_PARM_DESC(repeat,"auto-repeat for IR keys (default: on)");
38 static int debug = 0; /* debug level (0,1,2) */
39 module_param(debug, int, 0644);
41 #define dprintk(level, fmt, arg...) if (debug >= level) \
42 printk(KERN_DEBUG fmt , ## arg)
44 /* -------------------------------------------------------------------------- */
46 static void ir_input_key_event(struct input_dev *dev, struct ir_input_state *ir)
48 if (KEY_RESERVED == ir->keycode) {
49 printk(KERN_INFO "%s: unknown key: key=0x%02x raw=0x%02x down=%d\n",
50 dev->name,ir->ir_key,ir->ir_raw,ir->keypressed);
51 return;
53 dprintk(1,"%s: key event code=%d down=%d\n",
54 dev->name,ir->keycode,ir->keypressed);
55 input_report_key(dev,ir->keycode,ir->keypressed);
56 input_sync(dev);
59 /* -------------------------------------------------------------------------- */
61 void ir_input_init(struct input_dev *dev, struct ir_input_state *ir,
62 int ir_type, IR_KEYTAB_TYPE *ir_codes)
64 int i;
66 ir->ir_type = ir_type;
67 if (ir_codes)
68 memcpy(ir->ir_codes, ir_codes, sizeof(ir->ir_codes));
71 dev->keycode = ir->ir_codes;
72 dev->keycodesize = sizeof(IR_KEYTAB_TYPE);
73 dev->keycodemax = IR_KEYTAB_SIZE;
74 for (i = 0; i < IR_KEYTAB_SIZE; i++)
75 set_bit(ir->ir_codes[i], dev->keybit);
76 clear_bit(0, dev->keybit);
78 set_bit(EV_KEY, dev->evbit);
79 if (repeat)
80 set_bit(EV_REP, dev->evbit);
83 void ir_input_nokey(struct input_dev *dev, struct ir_input_state *ir)
85 if (ir->keypressed) {
86 ir->keypressed = 0;
87 ir_input_key_event(dev,ir);
91 void ir_input_keydown(struct input_dev *dev, struct ir_input_state *ir,
92 u32 ir_key, u32 ir_raw)
94 u32 keycode = IR_KEYCODE(ir->ir_codes, ir_key);
96 if (ir->keypressed && ir->keycode != keycode) {
97 ir->keypressed = 0;
98 ir_input_key_event(dev,ir);
100 if (!ir->keypressed) {
101 ir->ir_key = ir_key;
102 ir->ir_raw = ir_raw;
103 ir->keycode = keycode;
104 ir->keypressed = 1;
105 ir_input_key_event(dev,ir);
109 /* -------------------------------------------------------------------------- */
111 u32 ir_extract_bits(u32 data, u32 mask)
113 int mbit, vbit;
114 u32 value;
116 value = 0;
117 vbit = 0;
118 for (mbit = 0; mbit < 32; mbit++) {
119 if (!(mask & ((u32)1 << mbit)))
120 continue;
121 if (data & ((u32)1 << mbit))
122 value |= (1 << vbit);
123 vbit++;
125 return value;
128 static int inline getbit(u32 *samples, int bit)
130 return (samples[bit/32] & (1 << (31-(bit%32)))) ? 1 : 0;
133 /* sump raw samples for visual debugging ;) */
134 int ir_dump_samples(u32 *samples, int count)
136 int i, bit, start;
138 printk(KERN_DEBUG "ir samples: ");
139 start = 0;
140 for (i = 0; i < count * 32; i++) {
141 bit = getbit(samples,i);
142 if (bit)
143 start = 1;
144 if (0 == start)
145 continue;
146 printk("%s", bit ? "#" : "_");
148 printk("\n");
149 return 0;
152 /* decode raw samples, pulse distance coding used by NEC remotes */
153 int ir_decode_pulsedistance(u32 *samples, int count, int low, int high)
155 int i,last,bit,len;
156 u32 curBit;
157 u32 value;
159 /* find start burst */
160 for (i = len = 0; i < count * 32; i++) {
161 bit = getbit(samples,i);
162 if (bit) {
163 len++;
164 } else {
165 if (len >= 29)
166 break;
167 len = 0;
171 /* start burst to short */
172 if (len < 29)
173 return 0xffffffff;
175 /* find start silence */
176 for (len = 0; i < count * 32; i++) {
177 bit = getbit(samples,i);
178 if (bit) {
179 break;
180 } else {
181 len++;
185 /* silence to short */
186 if (len < 7)
187 return 0xffffffff;
189 /* go decoding */
190 len = 0;
191 last = 1;
192 value = 0; curBit = 1;
193 for (; i < count * 32; i++) {
194 bit = getbit(samples,i);
195 if (last) {
196 if(bit) {
197 continue;
198 } else {
199 len = 1;
201 } else {
202 if (bit) {
203 if (len > (low + high) /2)
204 value |= curBit;
205 curBit <<= 1;
206 if (curBit == 1)
207 break;
208 } else {
209 len++;
212 last = bit;
215 return value;
218 /* decode raw samples, biphase coding, used by rc5 for example */
219 int ir_decode_biphase(u32 *samples, int count, int low, int high)
221 int i,last,bit,len,flips;
222 u32 value;
224 /* find start bit (1) */
225 for (i = 0; i < 32; i++) {
226 bit = getbit(samples,i);
227 if (bit)
228 break;
231 /* go decoding */
232 len = 0;
233 flips = 0;
234 value = 1;
235 for (; i < count * 32; i++) {
236 if (len > high)
237 break;
238 if (flips > 1)
239 break;
240 last = bit;
241 bit = getbit(samples,i);
242 if (last == bit) {
243 len++;
244 continue;
246 if (len < low) {
247 len++;
248 flips++;
249 continue;
251 value <<= 1;
252 value |= bit;
253 flips = 0;
254 len = 1;
256 return value;
259 /* RC5 decoding stuff, moved from bttv-input.c to share it with
260 * saa7134 */
262 /* decode raw bit pattern to RC5 code */
263 u32 ir_rc5_decode(unsigned int code)
265 unsigned int org_code = code;
266 unsigned int pair;
267 unsigned int rc5 = 0;
268 int i;
270 for (i = 0; i < 14; ++i) {
271 pair = code & 0x3;
272 code >>= 2;
274 rc5 <<= 1;
275 switch (pair) {
276 case 0:
277 case 2:
278 break;
279 case 1:
280 rc5 |= 1;
281 break;
282 case 3:
283 dprintk(1, "ir-common: ir_rc5_decode(%x) bad code\n", org_code);
284 return 0;
287 dprintk(1, "ir-common: code=%x, rc5=%x, start=%x, toggle=%x, address=%x, "
288 "instr=%x\n", rc5, org_code, RC5_START(rc5),
289 RC5_TOGGLE(rc5), RC5_ADDR(rc5), RC5_INSTR(rc5));
290 return rc5;
293 void ir_rc5_timer_end(unsigned long data)
295 struct card_ir *ir = (struct card_ir *)data;
296 struct timeval tv;
297 unsigned long current_jiffies, timeout;
298 u32 gap;
299 u32 rc5 = 0;
301 /* get time */
302 current_jiffies = jiffies;
303 do_gettimeofday(&tv);
305 /* avoid overflow with gap >1s */
306 if (tv.tv_sec - ir->base_time.tv_sec > 1) {
307 gap = 200000;
308 } else {
309 gap = 1000000 * (tv.tv_sec - ir->base_time.tv_sec) +
310 tv.tv_usec - ir->base_time.tv_usec;
313 /* signal we're ready to start a new code */
314 ir->active = 0;
316 /* Allow some timer jitter (RC5 is ~24ms anyway so this is ok) */
317 if (gap < 28000) {
318 dprintk(1, "ir-common: spurious timer_end\n");
319 return;
322 if (ir->last_bit < 20) {
323 /* ignore spurious codes (caused by light/other remotes) */
324 dprintk(1, "ir-common: short code: %x\n", ir->code);
325 } else {
326 ir->code = (ir->code << ir->shift_by) | 1;
327 rc5 = ir_rc5_decode(ir->code);
329 /* two start bits? */
330 if (RC5_START(rc5) != ir->start) {
331 dprintk(1, "ir-common: rc5 start bits invalid: %u\n", RC5_START(rc5));
333 /* right address? */
334 } else if (RC5_ADDR(rc5) == ir->addr) {
335 u32 toggle = RC5_TOGGLE(rc5);
336 u32 instr = RC5_INSTR(rc5);
338 /* Good code, decide if repeat/repress */
339 if (toggle != RC5_TOGGLE(ir->last_rc5) ||
340 instr != RC5_INSTR(ir->last_rc5)) {
341 dprintk(1, "ir-common: instruction %x, toggle %x\n", instr,
342 toggle);
343 ir_input_nokey(ir->dev, &ir->ir);
344 ir_input_keydown(ir->dev, &ir->ir, instr,
345 instr);
348 /* Set/reset key-up timer */
349 timeout = current_jiffies + (500 + ir->rc5_key_timeout
350 * HZ) / 1000;
351 mod_timer(&ir->timer_keyup, timeout);
353 /* Save code for repeat test */
354 ir->last_rc5 = rc5;
359 void ir_rc5_timer_keyup(unsigned long data)
361 struct card_ir *ir = (struct card_ir *)data;
363 dprintk(1, "ir-common: key released\n");
364 ir_input_nokey(ir->dev, &ir->ir);
367 EXPORT_SYMBOL_GPL(ir_input_init);
368 EXPORT_SYMBOL_GPL(ir_input_nokey);
369 EXPORT_SYMBOL_GPL(ir_input_keydown);
371 EXPORT_SYMBOL_GPL(ir_extract_bits);
372 EXPORT_SYMBOL_GPL(ir_dump_samples);
373 EXPORT_SYMBOL_GPL(ir_decode_biphase);
374 EXPORT_SYMBOL_GPL(ir_decode_pulsedistance);
376 EXPORT_SYMBOL_GPL(ir_rc5_decode);
377 EXPORT_SYMBOL_GPL(ir_rc5_timer_end);
378 EXPORT_SYMBOL_GPL(ir_rc5_timer_keyup);
381 * Local variables:
382 * c-basic-offset: 8
383 * End: