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.
>
next prev parent 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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