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From: Guenter Roeck <linux@roeck-us.net>
To: Peter Rosin <peda@axentia.se>, linux-kernel@vger.kernel.org
Cc: Wolfram Sang <wsa@the-dreams.de>,
	Ken Chen <chen.kenyy@inventec.com>,
	joel@jms.id.au, linux-i2c@vger.kernel.org
Subject: Re: [PATCH 2/3] i2c: mux: pca9541: namespace cleanup
Date: Tue, 20 Mar 2018 06:20:37 -0700	[thread overview]
Message-ID: <e92c5457-20fd-1e6e-ab59-5ff53e647e89@roeck-us.net> (raw)
In-Reply-To: <20180320093200.19179-3-peda@axentia.se>

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@axentia.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.
> 

  reply	other threads:[~2018-03-20 13:20 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-20  6:19 [PATCH linux dev-4.16 v2] i2c: muxes: pca9641: new driver Ken Chen
2018-03-20  6:34 ` Joel Stanley
2018-03-20  9:31 ` Peter Rosin
2018-03-20  9:31   ` [PATCH 1/3] i2c: mux: pca9541: use the BIT macro Peter Rosin
2018-03-20 13:18     ` Guenter Roeck
2018-03-20 23:25     ` Vladimir Zapolskiy
2018-03-20  9:31   ` [PATCH 2/3] i2c: mux: pca9541: namespace cleanup Peter Rosin
2018-03-20 13:20     ` Guenter Roeck [this message]
2018-03-20 21:48       ` Peter Rosin
2018-03-20 21:57         ` Guenter Roeck
2018-03-20 23:24     ` Vladimir Zapolskiy
2018-03-21  5:53       ` Peter Rosin
2018-03-21  6:54         ` Vladimir Zapolskiy
2018-03-21  7:35           ` Peter Rosin
2018-03-20  9:32   ` [PATCH 3/3] i2c: mux: pca9541: prepare for PCA9641 support Peter Rosin
2018-03-20 13:22     ` Guenter Roeck
2018-03-20 23:17     ` Vladimir Zapolskiy
2018-03-21  1:19       ` Guenter Roeck
2018-03-21  7:01         ` Vladimir Zapolskiy
2018-03-21  8:09           ` Peter Rosin
2018-03-21  7:05     ` Vladimir Zapolskiy
2018-04-11  9:37   ` [PATCH linux dev-4.16 v2] i2c: muxes: pca9641: new driver Peter Rosin
2018-04-13  6:59     ` ChenKenYY 陳永營 TAO
2018-04-13  7:27       ` Peter Rosin
2018-04-16  7:37         ` ChenKenYY 陳永營 TAO

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