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saa7110.c
资源名称：linux-2.4.20.tar.gz　[点击查看]
上传用户：jlfgdled
上传日期：2013-04-10
资源大小：33168k
文件大小：11k
源码类别：

Linux/Unix编程

开发平台：

Unix_Linux

saa7110.c：源码内容
  1. /*
  2.     saa7110 - Philips SAA7110(A) video decoder driver
  4.     Copyright (C) 1998 Pauline Middelink <middelin@polyware.nl>
  6.     This program is free software; you can redistribute it and/or modify
  7.     it under the terms of the GNU General Public License as published by
  8.     the Free Software Foundation; either version 2 of the License, or
  9.     (at your option) any later version.
  11.     This program is distributed in the hope that it will be useful,
  12.     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14.     GNU General Public License for more details.
  16.     You should have received a copy of the GNU General Public License
  17.     along with this program; if not, write to the Free Software
  18.     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19. */
  21. #include <linux/module.h>
  22. #include <linux/init.h>
  23. #include <linux/types.h>
  24. #include <linux/delay.h>
  25. #include <linux/slab.h>
  26. #include <asm/io.h>
  27. #include <asm/uaccess.h>
  29. #include <linux/i2c-old.h>
  30. #include <linux/videodev.h>
  31. #include "linux/video_decoder.h"
  33. #define DEBUG(x...) /* remove when no long debugging */
  35. #define SAA7110_MAX_INPUT 9 /* 6 CVBS, 3 SVHS */
  36. #define SAA7110_MAX_OUTPUT 0 /* its a decoder only */
  38. #define I2C_SAA7110 0x9C /* or 0x9E */
  40. #define I2C_DELAY 10 /* 10 us or 100khz */
  42. struct saa7110 {
  43. struct i2c_bus *bus;
  44. int addr;
  45. unsigned char reg[36];
  47. int norm;
  48. int input;
  49. int enable;
  50. int bright;
  51. int contrast;
  52. int hue;
  53. int sat;
  54. };
  56. /* ----------------------------------------------------------------------- */
  57. /* I2C support functions    */
  58. /* ----------------------------------------------------------------------- */
  59. static
  60. int saa7110_write(struct saa7110 *decoder, unsigned char subaddr, unsigned char data)
  61. {
  62. int ack;
  64. LOCK_I2C_BUS(decoder->bus);
  65. i2c_start(decoder->bus);
  66. i2c_sendbyte(decoder->bus, decoder->addr, I2C_DELAY);
  67. i2c_sendbyte(decoder->bus, subaddr, I2C_DELAY);
  68. ack = i2c_sendbyte(decoder->bus, data, I2C_DELAY);
  69. i2c_stop(decoder->bus);
  70. decoder->reg[subaddr] = data;
  71. UNLOCK_I2C_BUS(decoder->bus);
  72. return ack;
  73. }
  75. static
  76. int saa7110_write_block(struct saa7110* decoder, unsigned const char *data, unsigned int len)
  77. {
  78. unsigned subaddr = *data;
  80. LOCK_I2C_BUS(decoder->bus);
  81.         i2c_start(decoder->bus);
  82.         i2c_sendbyte(decoder->bus,decoder->addr,I2C_DELAY);
  83. while (len-- > 0) {
  84.                 if (i2c_sendbyte(decoder->bus,*data,0)) {
  85.                         i2c_stop(decoder->bus);
  86.                         UNLOCK_I2C_BUS(decoder->bus);
  87.                         return -EAGAIN;
  88.                 }
  89. decoder->reg[subaddr++] = *data++;
  90.         }
  91. i2c_stop(decoder->bus);
  92. UNLOCK_I2C_BUS(decoder->bus);
  94. return 0;
  95. }
  97. static
  98. int saa7110_read(struct saa7110* decoder)
  99. {
  100. int data;
  102. LOCK_I2C_BUS(decoder->bus);
  103. i2c_start(decoder->bus);
  104. i2c_sendbyte(decoder->bus, decoder->addr, I2C_DELAY);
  105. i2c_start(decoder->bus);
  106. i2c_sendbyte(decoder->bus, decoder->addr | 1, I2C_DELAY);
  107. data = i2c_readbyte(decoder->bus, 1);
  108. i2c_stop(decoder->bus);
  109. UNLOCK_I2C_BUS(decoder->bus);
  110. return data;
  111. }
  113. /* ----------------------------------------------------------------------- */
  114. /* SAA7110 functions    */
  115. /* ----------------------------------------------------------------------- */
  116. static
  117. int saa7110_selmux(struct i2c_device *device, int chan)
  118. {
  119. static const unsigned char modes[9][8] = {
  120. /* mode 0 */ { 0x00, 0xD9, 0x17, 0x40, 0x03, 0x44, 0x75, 0x16 },
  121. /* mode 1 */ { 0x00, 0xD8, 0x17, 0x40, 0x03, 0x44, 0x75, 0x16 },
  122. /* mode 2 */ { 0x00, 0xBA, 0x07, 0x91, 0x03, 0x60, 0xB5, 0x05 },
  123. /* mode 3 */ { 0x00, 0xB8, 0x07, 0x91, 0x03, 0x60, 0xB5, 0x05 },
  124. /* mode 4 */ { 0x00, 0x7C, 0x07, 0xD2, 0x83, 0x60, 0xB5, 0x03 },
  125. /* mode 5 */ { 0x00, 0x78, 0x07, 0xD2, 0x83, 0x60, 0xB5, 0x03 },
  126. /* mode 6 */ { 0x80, 0x59, 0x17, 0x42, 0xA3, 0x44, 0x75, 0x12 },
  127. /* mode 7 */ { 0x80, 0x9A, 0x17, 0xB1, 0x13, 0x60, 0xB5, 0x14 },
  128. /* mode 8 */ { 0x80, 0x3C, 0x27, 0xC1, 0x23, 0x44, 0x75, 0x21 } };
  129. struct saa7110* decoder = device->data;
  130. const unsigned char* ptr = modes[chan];
  132. saa7110_write(decoder,0x06,ptr[0]); /* Luminance control */
  133. saa7110_write(decoder,0x20,ptr[1]); /* Analog Control #1 */
  134. saa7110_write(decoder,0x21,ptr[2]); /* Analog Control #2 */
  135. saa7110_write(decoder,0x22,ptr[3]); /* Mixer Control #1 */
  136. saa7110_write(decoder,0x2C,ptr[4]); /* Mixer Control #2 */
  137. saa7110_write(decoder,0x30,ptr[5]); /* ADCs gain control */
  138. saa7110_write(decoder,0x31,ptr[6]); /* Mixer Control #3 */
  139. saa7110_write(decoder,0x21,ptr[7]); /* Analog Control #2 */
  141. return 0;
  142. }
  144. static
  145. int determine_norm(struct i2c_device* dev)
  146. {
  147. struct saa7110* decoder = dev->data;
  148. int status;
  150. /* mode changed, start automatic detection */
  151. status = saa7110_read(decoder);
  152. if ((status & 3) == 0) {
  153. saa7110_write(decoder,0x06,0x80);
  154. if (status & 0x20) {
  155. DEBUG(printk(KERN_INFO "%s: norm=bw60n",dev->name));
  156. saa7110_write(decoder,0x2E,0x81);
  157. return VIDEO_MODE_NTSC;
  158. }
  159. DEBUG(printk(KERN_INFO "%s: norm=bw50n",dev->name));
  160. saa7110_write(decoder,0x2E,0x9A);
  161. return VIDEO_MODE_PAL;
  162. }
  164. saa7110_write(decoder,0x06,0x00);
  165. if (status & 0x20) { /* 60Hz */
  166. DEBUG(printk(KERN_INFO "%s: norm=ntscn",dev->name));
  167. saa7110_write(decoder,0x0D,0x06);
  168. saa7110_write(decoder,0x11,0x2C);
  169. saa7110_write(decoder,0x2E,0x81);
  170. return VIDEO_MODE_NTSC;
  171. }
  173. /* 50Hz -> PAL/SECAM */
  174. saa7110_write(decoder,0x0D,0x06);
  175. saa7110_write(decoder,0x11,0x59);
  176. saa7110_write(decoder,0x2E,0x9A);
  178. mdelay(150); /* pause 150 ms */
  180. status = saa7110_read(decoder);
  181. if ((status & 0x03) == 0x01) {
  182. DEBUG(printk(KERN_INFO "%s: norm=secamn",dev->name));
  183. saa7110_write(decoder,0x0D,0x07);
  184. return VIDEO_MODE_SECAM;
  185. }
  186. DEBUG(printk(KERN_INFO "%s: norm=paln",dev->name));
  187. return VIDEO_MODE_PAL;
  188. }
  190. static
  191. int saa7110_attach(struct i2c_device *device)
  192. {
  193. static const unsigned char initseq[] = {
  194.      0, 0x4C, 0x3C, 0x0D, 0xEF, 0xBD, 0xF0, 0x00, 0x00,
  195. 0xF8, 0xF8, 0x60, 0x60, 0x00, 0x06, 0x18, 0x90,
  196. 0x00, 0x2C, 0x40, 0x46, 0x42, 0x1A, 0xFF, 0xDA,
  197. 0xF0, 0x8B, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  198. 0xD9, 0x17, 0x40, 0x41, 0x80, 0x41, 0x80, 0x4F,
  199. 0xFE, 0x01, 0xCF, 0x0F, 0x03, 0x01, 0x81, 0x03,
  200. 0x40, 0x75, 0x01, 0x8C, 0x03};
  201. struct saa7110* decoder;
  202. int rv;
  204. device->data = decoder = kmalloc(sizeof(struct saa7110), GFP_KERNEL);
  205. if (device->data == 0)
  206. return -ENOMEM;
  208. MOD_INC_USE_COUNT;
  210. /* clear our private data */
  211. memset(decoder, 0, sizeof(struct saa7110));
  212. strcpy(device->name, "saa7110");
  213. decoder->bus = device->bus;
  214. decoder->addr = device->addr;
  215. decoder->norm = VIDEO_MODE_PAL;
  216. decoder->input = 0;
  217. decoder->enable = 1;
  218. decoder->bright = 32768;
  219. decoder->contrast = 32768;
  220. decoder->hue = 32768;
  221. decoder->sat = 32768;
  223. rv = saa7110_write_block(decoder, initseq, sizeof(initseq));
  224. if (rv < 0)
  225. printk(KERN_ERR "%s_attach: init status %dn", device->name, rv);
  226. else {
  227. saa7110_write(decoder,0x21,0x16);
  228. saa7110_write(decoder,0x0D,0x04);
  229. DEBUG(printk(KERN_INFO "%s_attach: chip version %xn", device->name, saa7110_read(decoder)));
  230. saa7110_write(decoder,0x0D,0x06);
  231. }
  233. /* setup and implicit mode 0 select has been performed */
  234. return 0;
  235. }
  237. static
  238. int saa7110_detach(struct i2c_device *device)
  239. {
  240. struct saa7110* decoder = device->data;
  242. DEBUG(printk(KERN_INFO "%s_detachn",device->name));
  244. /* stop further output */
  245. saa7110_write(decoder,0x0E,0x00);
  247. kfree(device->data);
  249. MOD_DEC_USE_COUNT;
  250. return 0;
  251. }
  253. static
  254. int saa7110_command(struct i2c_device *device, unsigned int cmd, void *arg)
  255. {
  256. struct saa7110* decoder = device->data;
  257. int v;
  259. switch (cmd) {
  260.  case DECODER_GET_CAPABILITIES:
  261. {
  262. struct video_decoder_capability *dc = arg;
  263. dc->flags = VIDEO_DECODER_PAL
  264.   | VIDEO_DECODER_NTSC
  265.   | VIDEO_DECODER_SECAM
  266.   | VIDEO_DECODER_AUTO
  267.   | VIDEO_DECODER_CCIR;
  268. dc->inputs = SAA7110_MAX_INPUT;
  269. dc->outputs = SAA7110_MAX_OUTPUT;
  270. }
  271. break;
  273.  case DECODER_GET_STATUS:
  274. {
  275. struct saa7110* decoder = device->data;
  276. int status;
  277. int res = 0;
  279. status = i2c_read(device->bus,device->addr|1);
  280. if (status & 0x40)
  281. res |= DECODER_STATUS_GOOD;
  282. if (status & 0x03)
  283. res |= DECODER_STATUS_COLOR;
  285. switch (decoder->norm) {
  286.  case VIDEO_MODE_NTSC:
  287. res |= DECODER_STATUS_NTSC;
  288. break;
  289.  case VIDEO_MODE_PAL:
  290. res |= DECODER_STATUS_PAL;
  291. break;
  292.  case VIDEO_MODE_SECAM:
  293. res |= DECODER_STATUS_SECAM;
  294. break;
  295. }
  296. *(int*)arg = res;
  297. }
  298. break;
  300.  case DECODER_SET_NORM:
  301. v = *(int*)arg;
  302. if (decoder->norm != v) {
  303. decoder->norm = v;
  304. saa7110_write(decoder, 0x06, 0x00);
  305. switch (v) {
  306.  case VIDEO_MODE_NTSC:
  307. saa7110_write(decoder, 0x0D, 0x06);
  308. saa7110_write(decoder, 0x11, 0x2C);
  309. saa7110_write(decoder, 0x30, 0x81);
  310. saa7110_write(decoder, 0x2A, 0xDF);
  311. break;
  312.  case VIDEO_MODE_PAL:
  313. saa7110_write(decoder, 0x0D, 0x06);
  314. saa7110_write(decoder, 0x11, 0x59);
  315. saa7110_write(decoder, 0x2E, 0x9A);
  316. break;
  317.  case VIDEO_MODE_SECAM:
  318. saa7110_write(decoder, 0x0D, 0x07);
  319. saa7110_write(decoder, 0x11, 0x59);
  320. saa7110_write(decoder, 0x2E, 0x9A);
  321. break;
  322.  case VIDEO_MODE_AUTO:
  323. *(int*)arg = determine_norm(device);
  324. break;
  325.  default:
  326. return -EPERM;
  327. }
  328. }
  329. break;
  331.  case DECODER_SET_INPUT:
  332. v = *(int*)arg;
  333. if (v<0 || v>SAA7110_MAX_INPUT)
  334. return -EINVAL;
  335. if (decoder->input != v) {
  336. decoder->input = v;
  337. saa7110_selmux(device, v);
  338. }
  339. break;
  341.  case DECODER_SET_OUTPUT:
  342. v = *(int*)arg;
  343. /* not much choice of outputs */
  344. if (v != 0)
  345. return -EINVAL;
  346. break;
  348.  case DECODER_ENABLE_OUTPUT:
  349. v = *(int*)arg;
  350. if (decoder->enable != v) {
  351. decoder->enable = v;
  352. saa7110_write(decoder,0x0E, v ? 0x18 : 0x00);
  353. }
  354. break;
  356.  case DECODER_SET_PICTURE:
  357. {
  358. struct video_picture *pic = arg;
  360. if (decoder->bright != pic->brightness) {
  361. /* We want 0 to 255 we get 0-65535 */
  362. decoder->bright = pic->brightness;
  363. saa7110_write(decoder, 0x19, decoder->bright >> 8);
  364. }
  365. if (decoder->contrast != pic->contrast) {
  366. /* We want 0 to 127 we get 0-65535 */
  367. decoder->contrast = pic->contrast;
  368. saa7110_write(decoder, 0x13, decoder->contrast >> 9);
  369. }
  370. if (decoder->sat != pic->colour) {
  371. /* We want 0 to 127 we get 0-65535 */
  372. decoder->sat = pic->colour;
  373. saa7110_write(decoder, 0x12, decoder->sat >> 9);
  374. }
  375. if (decoder->hue != pic->hue) {
  376. /* We want -128 to 127 we get 0-65535 */
  377. decoder->hue = pic->hue;
  378. saa7110_write(decoder, 0x07, (decoder->hue>>8)-128);
  379. }
  380. }
  381. break;
  383.  case DECODER_DUMP:
  384. for (v=0; v<34; v+=16) {
  385. int j;
  386. DEBUG(printk(KERN_INFO "%s: %03xn",device->name,v));
  387. for (j=0; j<16; j++) {
  388. DEBUG(printk(KERN_INFO " %02x",decoder->reg[v+j]));
  389. }
  390. DEBUG(printk(KERN_INFO "n"));
  391. }
  392. break;
  394.  default:
  395. DEBUG(printk(KERN_INFO "unknown saa7110_command??(%d)n",cmd));
  396. return -EINVAL;
  397. }
  398. return 0;
  399. }
  401. /* ----------------------------------------------------------------------- */
  403. static struct i2c_driver i2c_driver_saa7110 =
  404. {
  405. "saa7110", /* name */
  407. I2C_DRIVERID_VIDEODECODER, /* in i2c.h */
  408. I2C_SAA7110, I2C_SAA7110+1, /* Addr range */
  410. saa7110_attach,
  411. saa7110_detach,
  412. saa7110_command
  413. };
  415. EXPORT_NO_SYMBOLS;
  417. static int saa7110_init(void)
  418. {
  419. return i2c_register_driver(&i2c_driver_saa7110);
  420. }
  422. static void saa7110_exit(void)
  423. {
  424. i2c_unregister_driver(&i2c_driver_saa7110);
  425. }
  428. module_init(saa7110_init);
  429. module_exit(saa7110_exit);
  430. MODULE_LICENSE("GPL");