linux-kernel - Re: [PATCH 2/3] i2c: mux: pca9541: namespace cleanup

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Message-ID: <e92c5457-20fd-1e6e-ab59-5ff53e647e89@roeck-us.net>
Date:   Tue, 20 Mar 2018 06:20:37 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Peter Rosin <peda@...ntia.se>, linux-kernel@...r.kernel.org
Cc:     Wolfram Sang <wsa@...-dreams.de>,
        Ken Chen <chen.kenyy@...entec.com>, joel@....id.au,
        linux-i2c@...r.kernel.org
Subject: Re: [PATCH 2/3] i2c: mux: pca9541: namespace cleanup

On 03/20/2018 02:31 AM, Peter Rosin wrote:
> In preparation for PCA9641 support, convert the mybus and busoff macros
> to functions, and in the process prefix them with pca9541_. Also prefix
> remaining chip specific macros with PCA9541_.
> 
> Signed-off-by: Peter Rosin <peda@...ntia.se>
> ---
>   drivers/i2c/muxes/i2c-mux-pca9541.c | 26 +++++++++++++++++++-------
>   1 file changed, 19 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/i2c/muxes/i2c-mux-pca9541.c b/drivers/i2c/muxes/i2c-mux-pca9541.c
> index ad168125d23d..47685eb4e0e9 100644
> --- a/drivers/i2c/muxes/i2c-mux-pca9541.c
> +++ b/drivers/i2c/muxes/i2c-mux-pca9541.c
> @@ -59,10 +59,8 @@
>   #define PCA9541_ISTAT_MYTEST	BIT(6)
>   #define PCA9541_ISTAT_NMYTEST	BIT(7)
>   
> -#define BUSON		(PCA9541_CTL_BUSON | PCA9541_CTL_NBUSON)
> -#define MYBUS		(PCA9541_CTL_MYBUS | PCA9541_CTL_NMYBUS)
> -#define mybus(x)	(!((x) & MYBUS) || ((x) & MYBUS) == MYBUS)
> -#define busoff(x)	(!((x) & BUSON) || ((x) & BUSON) == BUSON)
> +#define PCA9541_BUSON	(PCA9541_CTL_BUSON | PCA9541_CTL_NBUSON)
> +#define PCA9541_MYBUS	(PCA9541_CTL_MYBUS | PCA9541_CTL_NMYBUS)
>   
>   /* arbitration timeouts, in jiffies */
>   #define ARB_TIMEOUT	(HZ / 8)	/* 125 ms until forcing bus ownership */
> @@ -93,6 +91,20 @@ static const struct of_device_id pca9541_of_match[] = {
>   MODULE_DEVICE_TABLE(of, pca9541_of_match);
>   #endif
>   
> +static int pca9541_mybus(int ctl)

bool ?

> +{
> +	if (!(ctl & PCA9541_MYBUS))
> +		return 1;

true ?

> +	return (ctl & PCA9541_MYBUS) == PCA9541_MYBUS;
> +}
> +
> +static int pca9541_busoff(int ctl)

bool ?

> +{
> +	if (!(ctl & PCA9541_BUSON))
> +		return 1;

true ?

> +	return (ctl & PCA9541_BUSON) == PCA9541_BUSON;
> +}
> +
>   /*
>    * Write to chip register. Don't use i2c_transfer()/i2c_smbus_xfer()
>    * as they will try to lock the adapter a second time.
> @@ -181,7 +193,7 @@ static void pca9541_release_bus(struct i2c_client *client)
>   	int reg;
>   
>   	reg = pca9541_reg_read(client, PCA9541_CONTROL);
> -	if (reg >= 0 && !busoff(reg) && mybus(reg))
> +	if (reg >= 0 && !pca9541_busoff(reg) && pca9541_mybus(reg))
>   		pca9541_reg_write(client, PCA9541_CONTROL,
>   				  (reg & PCA9541_CTL_NBUSON) >> 1);
>   }
> @@ -233,7 +245,7 @@ static int pca9541_arbitrate(struct i2c_client *client)
>   	if (reg < 0)
>   		return reg;
>   
> -	if (busoff(reg)) {
> +	if (pca9541_busoff(reg)) {
>   		int istat;
>   		/*
>   		 * Bus is off. Request ownership or turn it on unless
> @@ -258,7 +270,7 @@ static int pca9541_arbitrate(struct i2c_client *client)
>   			 */
>   			data->select_timeout = SELECT_DELAY_LONG * 2;
>   		}
> -	} else if (mybus(reg)) {
> +	} else if (pca9541_mybus(reg)) {
>   		/*
>   		 * Bus is on, and we own it. We are done with acquisition.
>   		 * Reset NTESTON and BUSINIT, then return success.
>