linux-kernel - Re: [PATCH] staging: pi433: change (struct pi433_tx_cfg)->bit

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Date:   Tue, 14 Feb 2023 20:24:36 +1100
From:   Jacob Bai <jacob.bai.au@...il.com>
To:     Deepak R Varma <drv@...lo.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
        error27@...il.com
Subject: Re: [PATCH] staging: pi433: change (struct pi433_tx_cfg)->bit_rate
 to be a u32

On Tue, Feb 14, 2023 at 01:28:20PM +0530, Deepak R Varma wrote:
> On Tue, Feb 14, 2023 at 05:33:46PM +1100, Jacob Bai wrote:
> > Based on the TODO file and datasheet of pi433, the maximum bit rate for
> > transmitter is 300kbps when modulation been set to FSK. Hence, the size
> > should be u32 rather than u16.
> 
> Hi Jacob,
> This change was already discussed recently. Please check the following link and
> all the responses to this thread:
> 
> https://lore.kernel.org/all/Y9h42l%2F8EcPqn63x@combine-ThinkPad-S1-Yoga/
> 
> Thanks,
> ./drv
Thanks Deepak and Dan!

Regards,
Jacob
> 
> > 
> > Signed-off-by: Jacob Bai <jacob.bai.au@...il.com>
> > ---
> >  drivers/staging/pi433/Documentation/pi433.txt | 3 ++-
> >  drivers/staging/pi433/pi433_if.h              | 2 +-
> >  drivers/staging/pi433/rf69.c                  | 4 ++--
> >  drivers/staging/pi433/rf69.h                  | 2 +-
> >  4 files changed, 6 insertions(+), 5 deletions(-)
> > 
> > diff --git a/drivers/staging/pi433/Documentation/pi433.txt b/drivers/staging/pi433/Documentation/pi433.txt
> > index 4a0d34b4ad37..b34d8e9f6d53 100644
> > --- a/drivers/staging/pi433/Documentation/pi433.txt
> > +++ b/drivers/staging/pi433/Documentation/pi433.txt
> > @@ -78,7 +78,8 @@ rf params:
> >  		Allowed values: 433050000...434790000
> >  	bit_rate
> >  		bit rate used for transmission.
> > -		Allowed values: #####
> > +		Allowed values when FSK: 1200...300000
> > +		Allowed values when OOK: 1200...32768
> >  	dev_frequency
> >  		frequency deviation in case of FSK.
> >  		Allowed values: 600...500000
> > diff --git a/drivers/staging/pi433/pi433_if.h b/drivers/staging/pi433/pi433_if.h
> > index 25ee0b77a32c..1f8ffaf02d99 100644
> > --- a/drivers/staging/pi433/pi433_if.h
> > +++ b/drivers/staging/pi433/pi433_if.h
> > @@ -51,7 +51,7 @@ enum option_on_off {
> >  #define PI433_TX_CFG_IOCTL_NR	0
> >  struct pi433_tx_cfg {
> >  	__u32			frequency;
> > -	__u16			bit_rate;
> > +	__u32			bit_rate;
> >  	__u32			dev_frequency;
> >  	enum modulation		modulation;
> >  	enum mod_shaping	mod_shaping;
> > diff --git a/drivers/staging/pi433/rf69.c b/drivers/staging/pi433/rf69.c
> > index 8c7fab6a46bb..0b90ca004dd6 100644
> > --- a/drivers/staging/pi433/rf69.c
> > +++ b/drivers/staging/pi433/rf69.c
> > @@ -185,7 +185,7 @@ int rf69_set_modulation_shaping(struct spi_device *spi,
> >  	}
> >  }
> >  
> > -int rf69_set_bit_rate(struct spi_device *spi, u16 bit_rate)
> > +int rf69_set_bit_rate(struct spi_device *spi, u32 bit_rate)
> >  {
> >  	int retval;
> >  	u32 bit_rate_reg;
> > @@ -201,7 +201,7 @@ int rf69_set_bit_rate(struct spi_device *spi, u16 bit_rate)
> >  	}
> >  
> >  	// check input value
> > -	if (bit_rate < 1200 || (mod == OOK && bit_rate > 32768)) {
> > +	if (bit_rate < 1200 || bit_rate > 300000 || (mod == OOK && bit_rate > 32768)) {
> >  		dev_dbg(&spi->dev, "setBitRate: illegal input param\n");
> >  		return -EINVAL;
> >  	}
> > diff --git a/drivers/staging/pi433/rf69.h b/drivers/staging/pi433/rf69.h
> > index 78fa0b8bab8b..46a1fb2d5329 100644
> > --- a/drivers/staging/pi433/rf69.h
> > +++ b/drivers/staging/pi433/rf69.h
> > @@ -24,7 +24,7 @@ int rf69_set_data_mode(struct spi_device *spi, u8 data_mode);
> >  int rf69_set_modulation(struct spi_device *spi, enum modulation modulation);
> >  int rf69_set_modulation_shaping(struct spi_device *spi,
> >  				enum mod_shaping mod_shaping);
> > -int rf69_set_bit_rate(struct spi_device *spi, u16 bit_rate);
> > +int rf69_set_bit_rate(struct spi_device *spi, u32 bit_rate);
> >  int rf69_set_deviation(struct spi_device *spi, u32 deviation);
> >  int rf69_set_frequency(struct spi_device *spi, u32 frequency);
> >  int rf69_enable_amplifier(struct spi_device *spi, u8 amplifier_mask);
> > -- 
> > 2.34.1
> > 
> > 
> 
>