[PATCH 4.7 098/143] mfd: cros_ec: Add cros_ec_cmd_xfer_status() helper
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2016-09-05 16:54:42
Also in:
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4.7-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tomeu Vizoso <redacted> commit 9798ac6d32c1a32d6d92d853ff507d2d39c4300c upstream. 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 <redacted> Reviewed-by: Benson Leung <bleung@chromium.org> Signed-off-by: Brian Norris <briannorris@chromium.org> Acked-by: Lee Jones <redacted> Tested-by: Enric Balletbo i Serra <redacted> Signed-off-by: Thierry Reding <redacted> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/platform/chrome/cros_ec_proto.c | 17 +++++++++++++++++ include/linux/mfd/cros_ec.h | 15 +++++++++++++++ 2 files changed, 32 insertions(+)
--- a/drivers/platform/chrome/cros_ec_proto.c
+++ b/drivers/platform/chrome/cros_ec_proto.c@@ -380,3 +380,20 @@ int cros_ec_cmd_xfer(struct cros_ec_devi return ret; } EXPORT_SYMBOL(cros_ec_cmd_xfer); + +int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev, + struct cros_ec_command *msg) +{ + int ret; + + 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 != EC_RES_SUCCESS) { + dev_dbg(ec_dev->dev, "Command result (err: %d)\n", msg->result); + return -EPROTO; + } + + return ret; +} +EXPORT_SYMBOL(cros_ec_cmd_xfer_status); --- a/include/linux/mfd/cros_ec.h +++ b/include/linux/mfd/cros_ec.h
@@ -226,6 +226,21 @@ int cros_ec_cmd_xfer(struct cros_ec_devi 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 success + * 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.