Commit 67b60aad authored by Chris Pascoe's avatar Chris Pascoe Committed by Mauro Carvalho Chehab
Browse files

V4L/DVB (5215): Experimental support for signal strength/BER/uncorrectable count 



After studying many hours worth of register dumps of MT352 and ZL10353 fed
with identically damaged RF signals I have made an educated guess at which
registers contain the AGC level, bit error rate and uncorrectable error
count values.
Implement the IOCTLs that return these values to userspace.

Signed-off-by: default avatarChris Pascoe <c.pascoe@itee.uq.edu.au>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@infradead.org>
parent 90060d32

drivers/media/dvb/frontends/zl10353.c

+36 −0
Original line number Diff line number Diff line
@@ -213,6 +213,29 @@ static int zl10353_read_status(struct dvb_frontend *fe, fe_status_t *status) 
	return 0;

}



static int zl10353_read_ber(struct dvb_frontend *fe, u32 *ber)

{

	struct zl10353_state *state = fe->demodulator_priv;



	*ber = zl10353_read_register(state, 0x11) << 16 |

	       zl10353_read_register(state, 0x12) << 8 |

	       zl10353_read_register(state, 0x13);



	return 0;

}



static int zl10353_read_signal_strength(struct dvb_frontend *fe, u16 *strength)

{

	struct zl10353_state *state = fe->demodulator_priv;



	u16 signal = zl10353_read_register(state, 0x0a) << 10 |

		     zl10353_read_register(state, 0x0b) << 2 | 3;



	*strength = ~signal;



	return 0;

}



static int zl10353_read_snr(struct dvb_frontend *fe, u16 *snr)

{

	struct zl10353_state *state = fe->demodulator_priv;
@@ -227,6 +250,16 @@ static int zl10353_read_snr(struct dvb_frontend *fe, u16 *snr) 
	return 0;

}



static int zl10353_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)

{

	struct zl10353_state *state = fe->demodulator_priv;



	*ucblocks = zl10353_read_register(state, 0x14) << 8 |

		    zl10353_read_register(state, 0x15);



	return 0;

}



static int zl10353_get_tune_settings(struct dvb_frontend *fe,

				     struct dvb_frontend_tune_settings

					 *fe_tune_settings)
@@ -325,7 +358,10 @@ static struct dvb_frontend_ops zl10353_ops = { 
	.get_tune_settings = zl10353_get_tune_settings,



	.read_status = zl10353_read_status,

	.read_ber = zl10353_read_ber,

	.read_signal_strength = zl10353_read_signal_strength,

	.read_snr = zl10353_read_snr,

	.read_ucblocks = zl10353_read_ucblocks,

};



module_param(debug_regs, int, 0644);

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