Messages in this thread Patch in this message | | | Date | Tue, 8 Mar 2016 15:54:16 -0800 | Subject | Re: [PATCH v4 2/6] mfd: cros_ec: Add cros_ec_cmd_xfer_status helper | From | Benson Leung <> |
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Thanks Tomeu! Small nit below, other wise looks good to me.
On Tue, Mar 8, 2016 at 2:35 AM, Tomeu Vizoso <tomeu.vizoso@collabora.com> wrote: > So that callers of cros_ec_cmd_xfer don't have to repeat boilerplate > code when checking for errors from the EC side. > > Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com> > --- > > Changes in v4: None > Changes in v3: None > Changes in v2: None > > drivers/platform/chrome/cros_ec_proto.c | 14 ++++++++++++++ > include/linux/mfd/cros_ec.h | 18 ++++++++++++++++++ > 2 files changed, 32 insertions(+) > > diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c > index c792e116e621..e45d6750bbdf 100644 > --- a/drivers/platform/chrome/cros_ec_proto.c > +++ b/drivers/platform/chrome/cros_ec_proto.c > @@ -472,3 +472,17 @@ int cros_ec_get_next_event(struct cros_ec_device *ec_dev) > return get_keyboard_state_event(ec_dev); > } > EXPORT_SYMBOL(cros_ec_get_next_event); > + > +int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev, > + struct cros_ec_command *msg) > +{ > + int ret = cros_ec_cmd_xfer(ec_dev, msg); > + > + if (ret < 0) > + dev_err(ec_dev->dev, "Command xfer error (err:%d)\n", ret); > + else if (msg->result)
Could you check for if (msg->result != EC_RES_SUCCESS) explicitly?
> + return -EECRESULT - msg->result; > + > + return ret; > +} > +EXPORT_SYMBOL(cros_ec_cmd_xfer_status); > diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h > index 1f88418a36cf..b6961c717209 100644 > --- a/include/linux/mfd/cros_ec.h > +++ b/include/linux/mfd/cros_ec.h > @@ -40,6 +40,9 @@ > #define EC_MAX_REQUEST_OVERHEAD 1 > #define EC_MAX_RESPONSE_OVERHEAD 2 > > +/* ec_command return value for non-success result from EC */ > +#define EECRESULT 1000 > + > /* > * Command interface between EC and AP, for LPC, I2C and SPI interfaces. > */ > @@ -250,6 +253,21 @@ int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev, > struct cros_ec_command *msg); > > /** > + * cros_ec_cmd_xfer_status - Send a command to the ChromeOS EC > + * > + * This function is identical to cros_ec_cmd_xfer, except it returns succes > + * status only if both the command was transmitted successfully and the EC > + * replied with success status. It's not necessary to check msg->result when > + * using this function. > + * > + * @ec_dev: EC device > + * @msg: Message to write > + * @return: Num. of bytes transferred on success, <0 on failure > + */ > +int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev, > + struct cros_ec_command *msg); > + > +/** > * cros_ec_remove - Remove a ChromeOS EC > * > * Call this to deregister a ChromeOS EC, then clean up any private data. > -- > 2.5.0 >
-- Benson Leung Senior Software Engineer, Chrom* OS bleung@chromium.org
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