cx88-tvaudio.c

底层驱动开发

		{ AUD_DEEMPH1_G0,	0x0D80 },
		{ AUD_DEEMPH1_A0,	0x6262 },
		{ AUD_DEEMPH1_B0,	0x1C29 },
		{ AUD_DEEMPH1_A1,	0x3FC66},
		{ AUD_DEEMPH1_B1,	0x399A},

		{ AUD_POLYPH80SCALEFAC,	0x0003},
		{ /* end of list */ },
	};
	static const struct rlist fm_deemph_75[] = {
		{ AUD_DEEMPH0_G0,	0x091B },
		{ AUD_DEEMPH0_A0,	0x6B68 },
		{ AUD_DEEMPH0_B0,	0x11EC },
		{ AUD_DEEMPH0_A1,	0x3FC66},
		{ AUD_DEEMPH0_B1,	0x399A },

		{ AUD_DEEMPH1_G0,	0x0AA0 },
		{ AUD_DEEMPH1_A0,	0x6B68 },
		{ AUD_DEEMPH1_B0,	0x11EC },
		{ AUD_DEEMPH1_A1,	0x3FC66},
		{ AUD_DEEMPH1_B1,	0x399A},

		{ AUD_POLYPH80SCALEFAC,	0x0003},
		{ /* end of list */ },
	};

	/* It is enough to leave default values? */
	static const struct rlist fm_no_deemph[] = {

		{ AUD_POLYPH80SCALEFAC,	0x0003},
		{ /* end of list */ },
	};

	dprintk("%s (status: unknown)\n",__FUNCTION__);
	set_audio_start(core, SEL_FMRADIO);

	switch (deemph)
	{
		case FM_NO_DEEMPH:
			set_audio_registers(core, fm_no_deemph);
			break;

		case FM_DEEMPH_50:
			set_audio_registers(core, fm_deemph_50);
			break;

		case FM_DEEMPH_75:
			set_audio_registers(core, fm_deemph_75);
			break;
	}

	set_audio_finish(core, EN_FMRADIO_AUTO_STEREO);
}

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

void cx88_set_tvaudio(struct cx88_core *core)
{
	switch (core->tvaudio) {
	case WW_BTSC:
		set_audio_standard_BTSC(core, 0, EN_BTSC_AUTO_STEREO);
		break;
	case WW_NICAM_BGDKL:
		set_audio_standard_NICAM_L(core,0);
		break;
	case WW_NICAM_I:
		set_audio_standard_PAL_I(core,0);
		break;
	case WW_A2_BG:
	case WW_A2_DK:
	case WW_A2_M:
	set_audio_standard_A2(core, EN_A2_FORCE_MONO1);
		break;
	case WW_EIAJ:
		set_audio_standard_EIAJ(core);
		break;
	case WW_FM:
		set_audio_standard_FM(core,FM_NO_DEEMPH);
		break;
	case WW_SYSTEM_L_AM:
		set_audio_standard_NICAM_L(core, 1);
		break;
	case WW_NONE:
	default:
		printk("%s/0: unknown tv audio mode [%d]\n",
		core->name, core->tvaudio);
		break;
	}
	return;
}

void cx88_newstation(struct cx88_core *core)
{
	core->audiomode_manual = UNSET;

	switch (core->tvaudio) {
	case WW_SYSTEM_L_AM:
		/* try nicam ... */
		core->audiomode_current = V4L2_TUNER_MODE_STEREO;
		set_audio_standard_NICAM_L(core, 1);
		break;
	}
}

void cx88_get_stereo(struct cx88_core *core, struct v4l2_tuner *t)
{
	static char *m[] = {"stereo", "dual mono", "mono", "sap"};
	static char *p[] = {"no pilot", "pilot c1", "pilot c2", "?"};
	u32 reg,mode,pilot;

	reg   = cx_read(AUD_STATUS);
	mode  = reg & 0x03;
	pilot = (reg >> 2) & 0x03;

	if (core->astat != reg)
		dprintk("AUD_STATUS: 0x%x [%s/%s] ctl=%s\n",
			reg, m[mode], p[pilot],
			aud_ctl_names[cx_read(AUD_CTL) & 63]);
	core->astat = reg;

/* TODO
       Reading from AUD_STATUS is not enough
       for auto-detecting sap/dual-fm/nicam.
       Add some code here later.
*/

# if 0
	t->capability = V4L2_TUNER_CAP_STEREO | V4L2_TUNER_CAP_SAP |
		V4L2_TUNER_CAP_LANG1 | V4L2_TUNER_CAP_LANG2;
	t->rxsubchans = V4L2_TUNER_SUB_MONO;
	t->audmode    = V4L2_TUNER_MODE_MONO;

	switch (core->tvaudio) {
	case WW_BTSC:
		t->capability = V4L2_TUNER_CAP_STEREO |
			V4L2_TUNER_CAP_SAP;
		t->rxsubchans = V4L2_TUNER_SUB_STEREO;
		if (1 == pilot) {
			/* SAP */
			t->rxsubchans |= V4L2_TUNER_SUB_SAP;
		}
		break;
	case WW_A2_BG:
	case WW_A2_DK:
	case WW_A2_M:
		if (1 == pilot) {
			/* stereo */
			t->rxsubchans = V4L2_TUNER_SUB_MONO | V4L2_TUNER_SUB_STEREO;
			if (0 == mode)
				t->audmode = V4L2_TUNER_MODE_STEREO;
		}
		if (2 == pilot) {
			/* dual language -- FIXME */
			t->rxsubchans = V4L2_TUNER_SUB_LANG1 | V4L2_TUNER_SUB_LANG2;
			t->audmode = V4L2_TUNER_MODE_LANG1;
		}
		break;
	case WW_NICAM_BGDKL:
		if (0 == mode) {
			t->audmode = V4L2_TUNER_MODE_STEREO;
			t->rxsubchans |= V4L2_TUNER_SUB_STEREO;
		}
		break;
	case WW_SYSTEM_L_AM:
		if (0x0 == mode && !(cx_read(AUD_INIT) & 0x04)) {
			t->audmode = V4L2_TUNER_MODE_STEREO;
			t->rxsubchans |= V4L2_TUNER_SUB_STEREO;
		}
		break ;
	default:
		/* nothing */
		break;
	}
# endif
	return;
}

void cx88_set_stereo(struct cx88_core *core, u32 mode, int manual)
{
	u32 ctl  = UNSET;
	u32 mask = UNSET;

	if (manual) {
		core->audiomode_manual = mode;
	} else {
		if (UNSET != core->audiomode_manual)
			return;
	}
	core->audiomode_current = mode;

	switch (core->tvaudio) {
	case WW_BTSC:
		switch (mode) {
		case V4L2_TUNER_MODE_MONO:
			set_audio_standard_BTSC(core, 0, EN_BTSC_FORCE_MONO);
			break;
		case V4L2_TUNER_MODE_LANG1:
			set_audio_standard_BTSC(core, 0, EN_BTSC_AUTO_STEREO);
			break;
		case V4L2_TUNER_MODE_LANG2:
			set_audio_standard_BTSC(core, 1, EN_BTSC_FORCE_SAP);
			break;
		case V4L2_TUNER_MODE_STEREO:
			set_audio_standard_BTSC(core, 0, EN_BTSC_FORCE_STEREO);
			break;
		}
		break;
	case WW_A2_BG:
	case WW_A2_DK:
	case WW_A2_M:
		switch (mode) {
		case V4L2_TUNER_MODE_MONO:
		case V4L2_TUNER_MODE_LANG1:
		set_audio_standard_A2(core, EN_A2_FORCE_MONO1);
			break;
		case V4L2_TUNER_MODE_LANG2:
		set_audio_standard_A2(core, EN_A2_FORCE_MONO2);
			break;
		case V4L2_TUNER_MODE_STEREO:
		set_audio_standard_A2(core, EN_A2_FORCE_STEREO);
			break;
		}
		break;
	case WW_NICAM_BGDKL:
		switch (mode) {
		case V4L2_TUNER_MODE_MONO:
			ctl  = EN_NICAM_FORCE_MONO1;
			mask = 0x3f;
			break;
		case V4L2_TUNER_MODE_LANG1:
			ctl  = EN_NICAM_AUTO_MONO2;
			mask = 0x3f;
			break;
		case V4L2_TUNER_MODE_STEREO:
			ctl  = EN_NICAM_FORCE_STEREO | EN_DMTRX_LR;
			mask = 0x93f;
			break;
		}
		break;
	case WW_SYSTEM_L_AM:
		switch (mode) {
		case V4L2_TUNER_MODE_MONO:
		case V4L2_TUNER_MODE_LANG1:  /* FIXME */
			set_audio_standard_NICAM_L(core, 0);
			break;
		case V4L2_TUNER_MODE_STEREO:
			set_audio_standard_NICAM_L(core, 1);
			break;
		}
		break;
	case WW_NICAM_I:
		switch (mode) {
		case V4L2_TUNER_MODE_MONO:
		case V4L2_TUNER_MODE_LANG1:
			set_audio_standard_PAL_I(core, 0);
			break;
		case V4L2_TUNER_MODE_STEREO:
			set_audio_standard_PAL_I(core, 1);
			break;
		}
		break;
	case WW_FM:
		switch (mode) {
		case V4L2_TUNER_MODE_MONO:
			ctl  = EN_FMRADIO_FORCE_MONO;
			mask = 0x3f;
			break;
		case V4L2_TUNER_MODE_STEREO:
			ctl  = EN_FMRADIO_AUTO_STEREO;
			mask = 0x3f;
			break;
		}
		break;
	}

	if (UNSET != ctl) {
		dprintk("cx88_set_stereo: mask 0x%x, ctl 0x%x "
			"[status=0x%x,ctl=0x%x,vol=0x%x]\n",
			mask, ctl, cx_read(AUD_STATUS),
			cx_read(AUD_CTL), cx_sread(SHADOW_AUD_VOL_CTL));
		cx_andor(AUD_CTL, mask, ctl);
	}
	return;
}

int cx88_audio_thread(void *data)
{
	struct cx88_core *core = data;
	struct v4l2_tuner t;
	u32 mode = 0;

	dprintk("cx88: tvaudio thread started\n");
	for (;;) {
		msleep_interruptible(1000);
		if (kthread_should_stop())
			break;

		/* just monitor the audio status for now ... */
		memset(&t,0,sizeof(t));
		cx88_get_stereo(core,&t);

		if (UNSET != core->audiomode_manual)
			/* manually set, don't do anything. */
			continue;

		/* monitor signal */
		if (t.rxsubchans & V4L2_TUNER_SUB_STEREO)
			mode = V4L2_TUNER_MODE_STEREO;
		else
			mode = V4L2_TUNER_MODE_MONO;
		if (mode == core->audiomode_current)
			continue;

		/* automatically switch to best available mode */
		cx88_set_stereo(core, mode, 0);
	}

	dprintk("cx88: tvaudio thread exiting\n");
	return 0;
}

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

EXPORT_SYMBOL(cx88_set_tvaudio);
EXPORT_SYMBOL(cx88_newstation);
EXPORT_SYMBOL(cx88_set_stereo);
EXPORT_SYMBOL(cx88_get_stereo);
EXPORT_SYMBOL(cx88_audio_thread);

/*
 * Local variables:
 * c-basic-offset: 8
 * End:
 * kate: eol "unix"; indent-width 3; remove-trailing-space on; replace-trailing-space-save on; tab-width 8; replace-tabs off; space-indent off; mixed-indent off
 */