saa6752hs.c

linux内核源码

				return -ERANGE;
			if (new > MPEG_PID_MAX)
				new = MPEG_PID_MAX;
			params->ts_pid_video = new;
			break;
		case V4L2_CID_MPEG_STREAM_PID_PCR:
			old = params->ts_pid_pcr;
			if (set && new > MPEG_PID_MAX)
				return -ERANGE;
			if (new > MPEG_PID_MAX)
				new = MPEG_PID_MAX;
			params->ts_pid_pcr = new;
			break;
		case V4L2_CID_MPEG_AUDIO_ENCODING:
			old = V4L2_MPEG_AUDIO_ENCODING_LAYER_2;
			if (set && new != old)
				return -ERANGE;
			new = old;
			break;
		case V4L2_CID_MPEG_AUDIO_L2_BITRATE:
			old = params->au_l2_bitrate;
			if (set && new != V4L2_MPEG_AUDIO_L2_BITRATE_256K &&
				   new != V4L2_MPEG_AUDIO_L2_BITRATE_384K)
				return -ERANGE;
			if (new <= V4L2_MPEG_AUDIO_L2_BITRATE_256K)
				new = V4L2_MPEG_AUDIO_L2_BITRATE_256K;
			else
				new = V4L2_MPEG_AUDIO_L2_BITRATE_384K;
			params->au_l2_bitrate = new;
			break;
		case V4L2_CID_MPEG_AUDIO_SAMPLING_FREQ:
			old = V4L2_MPEG_AUDIO_SAMPLING_FREQ_48000;
			if (set && new != old)
				return -ERANGE;
			new = old;
			break;
		case V4L2_CID_MPEG_VIDEO_ENCODING:
			old = V4L2_MPEG_VIDEO_ENCODING_MPEG_2;
			if (set && new != old)
				return -ERANGE;
			new = old;
			break;
		case V4L2_CID_MPEG_VIDEO_ASPECT:
			old = params->vi_aspect;
			if (set && new != V4L2_MPEG_VIDEO_ASPECT_16x9 &&
				   new != V4L2_MPEG_VIDEO_ASPECT_4x3)
				return -ERANGE;
			if (new != V4L2_MPEG_VIDEO_ASPECT_16x9)
				new = V4L2_MPEG_VIDEO_ASPECT_4x3;
			params->vi_aspect = new;
			break;
		case V4L2_CID_MPEG_VIDEO_BITRATE:
			old = params->vi_bitrate * 1000;
			new = 1000 * (new / 1000);
			if (set && new > MPEG_VIDEO_TARGET_BITRATE_MAX * 1000)
				return -ERANGE;
			if (new > MPEG_VIDEO_TARGET_BITRATE_MAX * 1000)
				new = MPEG_VIDEO_TARGET_BITRATE_MAX * 1000;
			params->vi_bitrate = new / 1000;
			break;
		case V4L2_CID_MPEG_VIDEO_BITRATE_PEAK:
			old = params->vi_bitrate_peak * 1000;
			new = 1000 * (new / 1000);
			if (set && new > MPEG_VIDEO_TARGET_BITRATE_MAX * 1000)
				return -ERANGE;
			if (new > MPEG_VIDEO_TARGET_BITRATE_MAX * 1000)
				new = MPEG_VIDEO_TARGET_BITRATE_MAX * 1000;
			params->vi_bitrate_peak = new / 1000;
			break;
		case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
			old = params->vi_bitrate_mode;
			params->vi_bitrate_mode = new;
			break;
		default:
			return -EINVAL;
	}
	if (cmd == VIDIOC_G_EXT_CTRLS)
		ctrl->value = old;
	else
		ctrl->value = new;
	return 0;
}

static int saa6752hs_init(struct i2c_client* client)
{
	unsigned char buf[9], buf2[4];
	struct saa6752hs_state *h;
	u32 crc;
	unsigned char localPAT[256];
	unsigned char localPMT[256];

	h = i2c_get_clientdata(client);

	/* Set video format - must be done first as it resets other settings */
	buf[0] = 0x41;
	buf[1] = h->video_format;
	i2c_master_send(client, buf, 2);

	/* Set number of lines in input signal */
	buf[0] = 0x40;
	buf[1] = 0x00;
	if (h->standard & V4L2_STD_525_60)
		buf[1] = 0x01;
	i2c_master_send(client, buf, 2);

	/* set bitrate */
	saa6752hs_set_bitrate(client, &h->params);

	/* Set GOP structure {3, 13} */
	buf[0] = 0x72;
	buf[1] = 0x03;
	buf[2] = 0x0D;
	i2c_master_send(client,buf,3);

	/* Set minimum Q-scale {4} */
	buf[0] = 0x82;
	buf[1] = 0x04;
	i2c_master_send(client,buf,2);

	/* Set maximum Q-scale {12} */
	buf[0] = 0x83;
	buf[1] = 0x0C;
	i2c_master_send(client,buf,2);

	/* Set Output Protocol */
	buf[0] = 0xD0;
	buf[1] = 0x81;
	i2c_master_send(client,buf,2);

	/* Set video output stream format {TS} */
	buf[0] = 0xB0;
	buf[1] = 0x05;
	i2c_master_send(client,buf,2);

	/* compute PAT */
	memcpy(localPAT, PAT, sizeof(PAT));
	localPAT[17] = 0xe0 | ((h->params.ts_pid_pmt >> 8) & 0x0f);
	localPAT[18] = h->params.ts_pid_pmt & 0xff;
	crc = crc32_be(~0, &localPAT[7], sizeof(PAT) - 7 - 4);
	localPAT[sizeof(PAT) - 4] = (crc >> 24) & 0xFF;
	localPAT[sizeof(PAT) - 3] = (crc >> 16) & 0xFF;
	localPAT[sizeof(PAT) - 2] = (crc >> 8) & 0xFF;
	localPAT[sizeof(PAT) - 1] = crc & 0xFF;

	/* compute PMT */
	memcpy(localPMT, PMT, sizeof(PMT));
	localPMT[3] = 0x40 | ((h->params.ts_pid_pmt >> 8) & 0x0f);
	localPMT[4] = h->params.ts_pid_pmt & 0xff;
	localPMT[15] = 0xE0 | ((h->params.ts_pid_pcr >> 8) & 0x0F);
	localPMT[16] = h->params.ts_pid_pcr & 0xFF;
	localPMT[20] = 0xE0 | ((h->params.ts_pid_video >> 8) & 0x0F);
	localPMT[21] = h->params.ts_pid_video & 0xFF;
	localPMT[25] = 0xE0 | ((h->params.ts_pid_audio >> 8) & 0x0F);
	localPMT[26] = h->params.ts_pid_audio & 0xFF;
	crc = crc32_be(~0, &localPMT[7], sizeof(PMT) - 7 - 4);
	localPMT[sizeof(PMT) - 4] = (crc >> 24) & 0xFF;
	localPMT[sizeof(PMT) - 3] = (crc >> 16) & 0xFF;
	localPMT[sizeof(PMT) - 2] = (crc >> 8) & 0xFF;
	localPMT[sizeof(PMT) - 1] = crc & 0xFF;

	/* Set Audio PID */
	buf[0] = 0xC1;
	buf[1] = (h->params.ts_pid_audio >> 8) & 0xFF;
	buf[2] = h->params.ts_pid_audio & 0xFF;
	i2c_master_send(client,buf,3);

	/* Set Video PID */
	buf[0] = 0xC0;
	buf[1] = (h->params.ts_pid_video >> 8) & 0xFF;
	buf[2] = h->params.ts_pid_video & 0xFF;
	i2c_master_send(client,buf,3);

	/* Set PCR PID */
	buf[0] = 0xC4;
	buf[1] = (h->params.ts_pid_pcr >> 8) & 0xFF;
	buf[2] = h->params.ts_pid_pcr & 0xFF;
	i2c_master_send(client,buf,3);

	/* Send SI tables */
	i2c_master_send(client,localPAT,sizeof(PAT));
	i2c_master_send(client,localPMT,sizeof(PMT));

	/* mute then unmute audio. This removes buzzing artefacts */
	buf[0] = 0xa4;
	buf[1] = 1;
	i2c_master_send(client, buf, 2);
	buf[1] = 0;
	i2c_master_send(client, buf, 2);

	/* start it going */
	saa6752hs_chip_command(client, SAA6752HS_COMMAND_START);

	/* readout current state */
	buf[0] = 0xE1;
	buf[1] = 0xA7;
	buf[2] = 0xFE;
	buf[3] = 0x82;
	buf[4] = 0xB0;
	i2c_master_send(client, buf, 5);
	i2c_master_recv(client, buf2, 4);

	/* change aspect ratio */
	buf[0] = 0xE0;
	buf[1] = 0xA7;
	buf[2] = 0xFE;
	buf[3] = 0x82;
	buf[4] = 0xB0;
	buf[5] = buf2[0];
	switch(h->params.vi_aspect) {
	case V4L2_MPEG_VIDEO_ASPECT_16x9:
		buf[6] = buf2[1] | 0x40;
		break;
	case V4L2_MPEG_VIDEO_ASPECT_4x3:
	default:
		buf[6] = buf2[1] & 0xBF;
		break;
		break;
	}
	buf[7] = buf2[2];
	buf[8] = buf2[3];
	i2c_master_send(client, buf, 9);

	return 0;
}

static int saa6752hs_attach(struct i2c_adapter *adap, int addr, int kind)
{
	struct saa6752hs_state *h;


	if (NULL == (h = kzalloc(sizeof(*h), GFP_KERNEL)))
		return -ENOMEM;
	h->client = client_template;
	h->params = param_defaults;
	h->client.adapter = adap;
	h->client.addr = addr;

	/* Assume 625 input lines */
	h->standard = 0;

	i2c_set_clientdata(&h->client, h);
	i2c_attach_client(&h->client);

	v4l_info(&h->client,"saa6752hs: chip found @ 0x%x\n", addr<<1);

	return 0;
}

static int saa6752hs_probe(struct i2c_adapter *adap)
{
	if (adap->class & I2C_CLASS_TV_ANALOG)
		return i2c_probe(adap, &addr_data, saa6752hs_attach);
	return 0;
}

static int saa6752hs_detach(struct i2c_client *client)
{
	struct saa6752hs_state *h;

	h = i2c_get_clientdata(client);
	i2c_detach_client(client);
	kfree(h);
	return 0;
}

static int
saa6752hs_command(struct i2c_client *client, unsigned int cmd, void *arg)
{
	struct saa6752hs_state *h = i2c_get_clientdata(client);
	struct v4l2_ext_controls *ctrls = arg;
	struct saa6752hs_mpeg_params params;
	int err = 0;
	int i;

	switch (cmd) {
	case VIDIOC_S_EXT_CTRLS:
		if (ctrls->ctrl_class != V4L2_CTRL_CLASS_MPEG)
			return -EINVAL;
		if (ctrls->count == 0) {
			/* apply settings and start encoder */
			saa6752hs_init(client);
			break;
		}
		/* fall through */
	case VIDIOC_TRY_EXT_CTRLS:
	case VIDIOC_G_EXT_CTRLS:
		if (ctrls->ctrl_class != V4L2_CTRL_CLASS_MPEG)
			return -EINVAL;
		params = h->params;
		for (i = 0; i < ctrls->count; i++) {
			if ((err = handle_ctrl(&params, ctrls->controls + i, cmd))) {
				ctrls->error_idx = i;
				return err;
			}
		}
		h->params = params;
		break;
	case VIDIOC_G_FMT:
	{
	   struct v4l2_format *f = arg;

	   if (h->video_format == SAA6752HS_VF_UNKNOWN)
		   h->video_format = SAA6752HS_VF_D1;
	   f->fmt.pix.width =
		   v4l2_format_table[h->video_format].fmt.pix.width;
	   f->fmt.pix.height =
		   v4l2_format_table[h->video_format].fmt.pix.height;
	   break ;
	}
	case VIDIOC_S_FMT:
	{
		struct v4l2_format *f = arg;

		saa6752hs_set_subsampling(client, f);
		break;
	}
	case VIDIOC_S_STD:
		h->standard = *((v4l2_std_id *) arg);
		break;
	default:
		/* nothing */
		break;
	}

	return err;
}

/* ----------------------------------------------------------------------- */

static struct i2c_driver driver = {
	.driver = {
		.name   = "saa6752hs",
	},
	.id             = I2C_DRIVERID_SAA6752HS,
	.attach_adapter = saa6752hs_probe,
	.detach_client  = saa6752hs_detach,
	.command        = saa6752hs_command,
};

static struct i2c_client client_template =
{
	.name       = "saa6752hs",
	.driver     = &driver,
};

static int __init saa6752hs_init_module(void)
{
	return i2c_add_driver(&driver);
}

static void __exit saa6752hs_cleanup_module(void)
{
	i2c_del_driver(&driver);
}

module_init(saa6752hs_init_module);
module_exit(saa6752hs_cleanup_module);

/*
 * Overrides for Emacs so that we follow Linus's tabbing style.
 * ---------------------------------------------------------------------------
 * Local variables:
 * c-basic-offset: 8
 * End:
 */