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Date:   Wed, 6 Dec 2017 11:43:30 +0200
From:   Marcus Wolf <marcus.wolf@...rthome-wolf.de>
To:     Simon Sandström <simon@...anor.nu>,
        gregkh@...uxfoundation.org
Cc:     linux@...f-Entwicklungen.de, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 09/11] staging: pi433: Combine all
 rf69_set_amplifier_x()



Am 06.12.2017 um 00:08 schrieb Simon Sandström:
> Replaces the functions rf69_set_amplifier_1, _2, _3 with two
> functions: rf69_enable_amplifier(dev, amp_mask) and
> rf69_disable_amplifier(dev, amp_mask).
> 
> Signed-off-by: Simon Sandström <simon@...anor.nu>
> ---
>   drivers/staging/pi433/pi433_if.c |  6 +++---
>   drivers/staging/pi433/rf69.c     | 46 ++++------------------------------------
>   drivers/staging/pi433/rf69.h     |  8 ++-----
>   3 files changed, 9 insertions(+), 51 deletions(-)
> 
> diff --git a/drivers/staging/pi433/pi433_if.c b/drivers/staging/pi433/pi433_if.c
> index 3b4170b9ba94..688d0cf00782 100644
> --- a/drivers/staging/pi433/pi433_if.c
> +++ b/drivers/staging/pi433/pi433_if.c
> @@ -1126,9 +1126,9 @@ static int pi433_probe(struct spi_device *spi)
>   	/* setup the radio module */
>   	SET_CHECKED(rf69_set_mode		(spi, standby));
>   	SET_CHECKED(rf69_set_data_mode		(spi, DATAMODUL_MODE_PACKET));
> -	SET_CHECKED(rf69_set_amplifier_0	(spi, OPTION_ON));
> -	SET_CHECKED(rf69_set_amplifier_1	(spi, OPTION_OFF));
> -	SET_CHECKED(rf69_set_amplifier_2	(spi, OPTION_OFF));
> +	SET_CHECKED(rf69_enable_amplifier(spi, MASK_PALEVEL_PA0));
> +	SET_CHECKED(rf69_disable_amplifier(spi, MASK_PALEVEL_PA1));
> +	SET_CHECKED(rf69_disable_amplifier(spi, MASK_PALEVEL_PA2));
>   	SET_CHECKED(rf69_set_output_power_level	(spi, 13));
>   	SET_CHECKED(rf69_set_antenna_impedance	(spi, fiftyOhm));
>   
> diff --git a/drivers/staging/pi433/rf69.c b/drivers/staging/pi433/rf69.c
> index 4c9eb97978ef..c97c65ea8acd 100644
> --- a/drivers/staging/pi433/rf69.c
> +++ b/drivers/staging/pi433/rf69.c
> @@ -262,52 +262,14 @@ int rf69_set_frequency(struct spi_device *spi, u32 frequency)
>   	return 0;
>   }
>   
> -int rf69_set_amplifier_0(struct spi_device *spi,
> -			 enum option_on_off option_on_off)
> +int rf69_enable_amplifier(struct spi_device *spi, u8 amplifier_mask)
>   {
> -	#ifdef DEBUG
> -		dev_dbg(&spi->dev, "set: amp #0");
> -	#endif
> -
> -	switch (option_on_off) {
> -	case OPTION_ON:  return WRITE_REG(REG_PALEVEL, (READ_REG(REG_PALEVEL) |  MASK_PALEVEL_PA0));
> -	case OPTION_OFF: return WRITE_REG(REG_PALEVEL, (READ_REG(REG_PALEVEL) & ~MASK_PALEVEL_PA0));
> -	default:
> -		dev_dbg(&spi->dev, "set: illegal input param");
> -		return -EINVAL;
> -	}
> -}
> -
> -int rf69_set_amplifier_1(struct spi_device *spi,
> -			 enum option_on_off option_on_off)
> -{
> -	#ifdef DEBUG
> -		dev_dbg(&spi->dev, "set: amp #1");
> -	#endif
> -
> -	switch (option_on_off) {
> -	case OPTION_ON:  return WRITE_REG(REG_PALEVEL, (READ_REG(REG_PALEVEL) |  MASK_PALEVEL_PA1));
> -	case OPTION_OFF: return WRITE_REG(REG_PALEVEL, (READ_REG(REG_PALEVEL) & ~MASK_PALEVEL_PA1));
> -	default:
> -		dev_dbg(&spi->dev, "set: illegal input param");
> -		return -EINVAL;
> -	}
> +	return WRITE_REG(REG_PALEVEL, (READ_REG(REG_PALEVEL) | amplifier_mask));
>   }
>   
> -int rf69_set_amplifier_2(struct spi_device *spi,
> -			 enum option_on_off option_on_off)
> +int rf69_disable_amplifier(struct spi_device *spi, u8 amplifier_mask)
>   {
> -	#ifdef DEBUG
> -		dev_dbg(&spi->dev, "set: amp #2");
> -	#endif
> -
> -	switch (option_on_off) {
> -	case OPTION_ON:	 return WRITE_REG(REG_PALEVEL, (READ_REG(REG_PALEVEL) |  MASK_PALEVEL_PA2));
> -	case OPTION_OFF: return WRITE_REG(REG_PALEVEL, (READ_REG(REG_PALEVEL) & ~MASK_PALEVEL_PA2));
> -	default:
> -		dev_dbg(&spi->dev, "set: illegal input param");
> -		return -EINVAL;
> -	}
> +	return WRITE_REG(REG_PALEVEL, (READ_REG(REG_PALEVEL) & ~amplifier_mask));
>   }
>   
>   int rf69_set_output_power_level(struct spi_device *spi, u8 powerLevel)
> diff --git a/drivers/staging/pi433/rf69.h b/drivers/staging/pi433/rf69.h
> index 18296b4502f3..ba25ab6aeae7 100644
> --- a/drivers/staging/pi433/rf69.h
> +++ b/drivers/staging/pi433/rf69.h
> @@ -33,12 +33,8 @@ int rf69_set_modulation_shaping(struct spi_device *spi, enum mod_shaping mod_sha
>   int rf69_set_bit_rate(struct spi_device *spi, u16 bitRate);
>   int rf69_set_deviation(struct spi_device *spi, u32 deviation);
>   int rf69_set_frequency(struct spi_device *spi, u32 frequency);
> -int rf69_set_amplifier_0(struct spi_device *spi,
> -			 enum option_on_off option_on_off);
> -int rf69_set_amplifier_1(struct spi_device *spi,
> -			 enum option_on_off option_on_off);
> -int rf69_set_amplifier_2(struct spi_device *spi,
> -			 enum option_on_off option_on_off);
> +int rf69_enable_amplifier(struct spi_device *spi, u8 amplifier_mask);
> +int rf69_disable_amplifier(struct spi_device *spi, u8 amplifier_mask);
>   int rf69_set_output_power_level(struct spi_device *spi, u8 powerLevel);
>   int rf69_set_pa_ramp(struct spi_device *spi, enum paRamp paRamp);
>   int rf69_set_antenna_impedance(struct spi_device *spi, enum antennaImpedance antennaImpedance);
> 

Hi Simon,

I am sorry. I don't like that.

You expand to two functions, to get the luxury of having an enable and a 
disable function.
On the other hand, you colapse from 3 function - one for each amp - to a 
single, taking the amp number as argument.

Although I don't see the big benefit, in programming theory this might 
be a better solution.
But the old implementation reflects the hardware and the datasheet, 
since the chip does not have a register to enable and a register to 
disable, taking the amp number, but the chip has three bits, saying on 
or off.
For someone, not reading the code as a "novel", but work with it, he for 
sure will read the datasheet. Then the new construction will be 
uncomfortable for him.

I tried to reflect the chip in every function I wrote. And the DEFINES 
in rf69.h are (almost) exactly named, as the you'll find the namings in 
the datasheet. That eases working with such a complex chip a lot.

Sorry,

Marcus

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