tuner-simple.c

底层驱动开发

{
	unsigned char byte;

	if (1 != i2c_master_recv(c,&byte,1))
		return 0;

	return byte;
}

static int tuner_signal(struct i2c_client *c)
{
	return (tuner_getstatus(c) & TUNER_SIGNAL) << 13;
}

static int tuner_stereo(struct i2c_client *c)
{
	int stereo, status;
	struct tuner *t = i2c_get_clientdata(c);

	status = tuner_getstatus (c);

	switch (t->type) {
        	case TUNER_PHILIPS_FM1216ME_MK3:
    		case TUNER_PHILIPS_FM1236_MK3:
		case TUNER_PHILIPS_FM1256_IH3:
			stereo = ((status & TUNER_SIGNAL) == TUNER_STEREO_MK3);
			break;
		default:
			stereo = status & TUNER_STEREO;
	}

	return stereo;
}


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

static void default_set_tv_freq(struct i2c_client *c, unsigned int freq)
{
	struct tuner *t = i2c_get_clientdata(c);
	u8 config;
	u16 div;
	struct tunertype *tun;
        unsigned char buffer[4];
	int rc;

	tun = &tuners[t->type];
	if (freq < tun->thresh1) {
		config = tun->VHF_L;
		tuner_dbg("tv: VHF lowrange\n");
	} else if (freq < tun->thresh2) {
		config = tun->VHF_H;
		tuner_dbg("tv: VHF high range\n");
	} else {
		config = tun->UHF;
		tuner_dbg("tv: UHF range\n");
	}


	/* tv norm specific stuff for multi-norm tuners */
	switch (t->type) {
	case TUNER_PHILIPS_SECAM: // FI1216MF
		/* 0x01 -> ??? no change ??? */
		/* 0x02 -> PAL BDGHI / SECAM L */
		/* 0x04 -> ??? PAL others / SECAM others ??? */
		config &= ~0x02;
		if (t->std & V4L2_STD_SECAM)
			config |= 0x02;
		break;

	case TUNER_TEMIC_4046FM5:
		config &= ~0x0f;

		if (t->std & V4L2_STD_PAL_BG) {
			config |= TEMIC_SET_PAL_BG;

		} else if (t->std & V4L2_STD_PAL_I) {
			config |= TEMIC_SET_PAL_I;

		} else if (t->std & V4L2_STD_PAL_DK) {
			config |= TEMIC_SET_PAL_DK;

		} else if (t->std & V4L2_STD_SECAM_L) {
			config |= TEMIC_SET_PAL_L;

		}
		break;

	case TUNER_PHILIPS_FQ1216ME:
		config &= ~0x0f;

		if (t->std & (V4L2_STD_PAL_BG|V4L2_STD_PAL_DK)) {
			config |= PHILIPS_SET_PAL_BGDK;

		} else if (t->std & V4L2_STD_PAL_I) {
			config |= PHILIPS_SET_PAL_I;

		} else if (t->std & V4L2_STD_SECAM_L) {
			config |= PHILIPS_SET_PAL_L;

		}
		break;

	case TUNER_PHILIPS_ATSC:
		/* 0x00 -> ATSC antenna input 1 */
		/* 0x01 -> ATSC antenna input 2 */
		/* 0x02 -> NTSC antenna input 1 */
		/* 0x03 -> NTSC antenna input 2 */
		config &= ~0x03;
		if (!(t->std & V4L2_STD_ATSC))
			config |= 2;
		/* FIXME: input */
		break;

	case TUNER_MICROTUNE_4042FI5:
		/* Set the charge pump for fast tuning */
		tun->config |= TUNER_CHARGE_PUMP;
		break;
	}

	/*
	 * Philips FI1216MK2 remark from specification :
	 * for channel selection involving band switching, and to ensure
	 * smooth tuning to the desired channel without causing
	 * unnecessary charge pump action, it is recommended to consider
	 * the difference between wanted channel frequency and the
	 * current channel frequency.  Unnecessary charge pump action
	 * will result in very low tuning voltage which may drive the
	 * oscillator to extreme conditions.
	 *
	 * Progfou: specification says to send config data before
	 * frequency in case (wanted frequency < current frequency).
	 */

	div=freq + tun->IFPCoff;
	if (t->type == TUNER_PHILIPS_SECAM && freq < t->freq) {
		buffer[0] = tun->config;
		buffer[1] = config;
		buffer[2] = (div>>8) & 0x7f;
		buffer[3] = div      & 0xff;
	} else {
		buffer[0] = (div>>8) & 0x7f;
		buffer[1] = div      & 0xff;
		buffer[2] = tun->config;
		buffer[3] = config;
	}
	tuner_dbg("tv 0x%02x 0x%02x 0x%02x 0x%02x\n",
		  buffer[0],buffer[1],buffer[2],buffer[3]);

        if (4 != (rc = i2c_master_send(c,buffer,4)))
		tuner_warn("i2c i/o error: rc == %d (should be 4)\n",rc);

	if (t->type == TUNER_MICROTUNE_4042FI5) {
		// FIXME - this may also work for other tuners
		unsigned long timeout = jiffies + msecs_to_jiffies(1);
		u8 status_byte = 0;

		/* Wait until the PLL locks */
		for (;;) {
			if (time_after(jiffies,timeout))
				return;
			if (1 != (rc = i2c_master_recv(c,&status_byte,1))) {
				tuner_warn("i2c i/o read error: rc == %d (should be 1)\n",rc);
				break;
			}
			if (status_byte & TUNER_PLL_LOCKED)
				break;
			udelay(10);
		}

		/* Set the charge pump for optimized phase noise figure */
		tun->config &= ~TUNER_CHARGE_PUMP;
		buffer[0] = (div>>8) & 0x7f;
		buffer[1] = div      & 0xff;
		buffer[2] = tun->config;
		buffer[3] = config;
		tuner_dbg("tv 0x%02x 0x%02x 0x%02x 0x%02x\n",
		       buffer[0],buffer[1],buffer[2],buffer[3]);

		if (4 != (rc = i2c_master_send(c,buffer,4)))
			tuner_warn("i2c i/o error: rc == %d (should be 4)\n",rc);
	}
}

static void default_set_radio_freq(struct i2c_client *c, unsigned int freq)
{
	struct tunertype *tun;
	struct tuner *t = i2c_get_clientdata(c);
        unsigned char buffer[4];
	unsigned div;
	int rc;

	tun = &tuners[t->type];
	div = (20 * freq / 16000) + (int)(20*10.7); /* IF 10.7 MHz */
	buffer[2] = (tun->config & ~TUNER_RATIO_MASK) | TUNER_RATIO_SELECT_50; /* 50 kHz step */

	switch (t->type) {
	case TUNER_TENA_9533_DI:
	case TUNER_YMEC_TVF_5533MF:
		tuner_dbg ("This tuner doesn't have FM. Most cards has a TEA5767 for FM\n");
		return;
	case TUNER_PHILIPS_FM1216ME_MK3:
	case TUNER_PHILIPS_FM1236_MK3:
	case TUNER_PHILIPS_FMD1216ME_MK3:
		buffer[3] = 0x19;
		break;
	case TUNER_PHILIPS_FM1256_IH3:
		div = (20 * freq) / 16000 + (int)(33.3 * 20);  /* IF 33.3 MHz */
		buffer[3] = 0x19;
		break;
	case TUNER_LG_PAL_FM:
		buffer[3] = 0xa5;
		break;
	case TUNER_MICROTUNE_4049FM5:
		div = (20 * freq) / 16000 + (int)(33.3 * 20); /* IF 33.3 MHz */
		buffer[3] = 0xa4;
		break;
	default:
		buffer[3] = 0xa4;
		break;
	}
        buffer[0] = (div>>8) & 0x7f;
        buffer[1] = div      & 0xff;

	tuner_dbg("radio 0x%02x 0x%02x 0x%02x 0x%02x\n",
	       buffer[0],buffer[1],buffer[2],buffer[3]);

        if (4 != (rc = i2c_master_send(c,buffer,4)))
		tuner_warn("i2c i/o error: rc == %d (should be 4)\n",rc);
}

int default_tuner_init(struct i2c_client *c)
{
	struct tuner *t = i2c_get_clientdata(c);

	tuner_info("type set to %d (%s)\n",
		   t->type, tuners[t->type].name);
	strlcpy(c->name, tuners[t->type].name, sizeof(c->name));

	t->tv_freq    = default_set_tv_freq;
	t->radio_freq = default_set_radio_freq;
	t->has_signal = tuner_signal;
	t->is_stereo  = tuner_stereo;
	t->standby = NULL;

	return 0;
}

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