linux-kernel - Re: [PATCH v4 1/1] iio: common: cros_ec

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Date:   Tue, 16 Jul 2019 10:56:38 +0200
From:   Fabien Lahoudere <fabien.lahoudere@...labora.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     gwendal@...omium.org, egranata@...omium.org, kernel@...labora.com,
        Nick Vaccaro <nvaccaro@...omium.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>, linux-iio@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/1] iio: common: cros_ec_sensors: determine protocol
 version

Le dimanche 14 juillet 2019 à 17:19 +0100, Jonathan Cameron a écrit :
> On Tue,  2 Jul 2019 10:49:38 +0200
> Fabien Lahoudere <fabien.lahoudere@...labora.com> wrote:
> 
> > This patch adds a function to determine which version of the
> > protocol is used to communicate with EC.
> > 
> > Signed-off-by: Fabien Lahoudere <fabien.lahoudere@...labora.com>
> > Signed-off-by: Nick Vaccaro <nvaccaro@...omium.org>
> > Reviewed-by: Gwendal Grignou <gwendal@...omium.org>
> > Tested-by: Gwendal Grignou <gwendal@...omium.org>
> > Acked-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
> There are so many different series flying around for this driver that
> I have given up trying to figure out if I should be picking some of
> them up.  I'll ack them on the assumption they'll all go together,
> but feel free to ping me if you want me to pick some of them up
> through IIO.
> 

Yes sorry for all that confusing series.
Enric wanted this patch first and it is independant of others, so feel
free to pick it. Others patcheshave been sent separately.

Thanks

> Acked-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> 
> Thanks,
> 
> Jonathan
> 
> > ---
> >  .../cros_ec_sensors/cros_ec_sensors_core.c    | 36
> > ++++++++++++++++++-
> >  1 file changed, 35 insertions(+), 1 deletion(-)
> > 
> > diff --git
> > a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> > b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> > index 130362ca421b..81111af8a167 100644
> > --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> > +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> > @@ -25,6 +25,31 @@ static char *cros_ec_loc[] = {
> >  	[MOTIONSENSE_LOC_MAX] = "unknown",
> >  };
> >  
> > +static int cros_ec_get_host_cmd_version_mask(struct cros_ec_device
> > *ec_dev,
> > +					     u16 cmd_offset, u16 cmd,
> > u32 *mask)
> > +{
> > +	int ret;
> > +	struct {
> > +		struct cros_ec_command msg;
> > +		union {
> > +			struct ec_params_get_cmd_versions params;
> > +			struct ec_response_get_cmd_versions resp;
> > +		};
> > +	} __packed buf = {
> > +		.msg = {
> > +			.command = EC_CMD_GET_CMD_VERSIONS +
> > cmd_offset,
> > +			.insize = sizeof(struct
> > ec_response_get_cmd_versions),
> > +			.outsize = sizeof(struct
> > ec_params_get_cmd_versions)
> > +			},
> > +		.params = {.cmd = cmd}
> > +	};
> > +
> > +	ret = cros_ec_cmd_xfer_status(ec_dev, &buf.msg);
> > +	if (ret >= 0)
> > +		*mask = buf.resp.version_mask;
> > +	return ret;
> > +}
> > +
> >  int cros_ec_sensors_core_init(struct platform_device *pdev,
> >  			      struct iio_dev *indio_dev,
> >  			      bool physical_device)
> > @@ -33,6 +58,8 @@ int cros_ec_sensors_core_init(struct
> > platform_device *pdev,
> >  	struct cros_ec_sensors_core_state *state = iio_priv(indio_dev);
> >  	struct cros_ec_dev *ec = dev_get_drvdata(pdev->dev.parent);
> >  	struct cros_ec_sensor_platform *sensor_platform =
> > dev_get_platdata(dev);
> > +	u32 ver_mask;
> > +	int ret;
> >  
> >  	platform_set_drvdata(pdev, indio_dev);
> >  
> > @@ -47,8 +74,15 @@ int cros_ec_sensors_core_init(struct
> > platform_device *pdev,
> >  
> >  	mutex_init(&state->cmd_lock);
> >  
> > +	ret = cros_ec_get_host_cmd_version_mask(state->ec,
> > +						ec->cmd_offset,
> > +						EC_CMD_MOTION_SENSE_CMD
> > ,
> > +						&ver_mask);
> > +	if (ret < 0)
> > +		return ret;
> > +
> >  	/* Set up the host command structure. */
> > -	state->msg->version = 2;
> > +	state->msg->version = fls(ver_mask) - 1;
> >  	state->msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
> >  	state->msg->outsize = sizeof(struct ec_params_motion_sense);
> >