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platform/chrome: cros_ec_proto: Convert EC error codes to Linux error codes

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The EC reports a variety of error codes. Most of those, with the exception
of EC_RES_INVALID_VERSION, are converted to -EPROTO. As result, the actual
EC error code gets lost. Introduce cros_ec_map_error() to map EC error
codes to Linux error codes, and use it in cros_ec_cmd_xfer_status() to
report more meaningful errors to the caller. With this change, callers of
cros_ec_cmd_xfer_status() can implement a more distinguished action without
having to rely on the EC error code. At the same time, debugging is improved
in situations where the Linux error code is reported to userspace and/or in
the kernel log.

Cc: Gwendal Grignou <gwendal@chromium.org>
Cc: Yu-Hsuan Hsu <yuhsuan@chromium.org>
Cc: Prashant Malani <pmalani@chromium.org>
Cc: Brian Norris <briannorris@chromium.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
This commit is contained in:
Guenter Roeck 2020-08-22 08:08:56 -07:00 committed by Enric Balletbo i Serra
parent b4e452b5e9
commit 0d080459e8
1 changed files with 46 additions and 11 deletions
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57
drivers/platform/chrome/cros_ec_proto.c
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@ -15,6 +15,43 @@
#define EC_COMMAND_RETRIES 50
static const int cros_ec_error_map[] = {
[EC_RES_INVALID_COMMAND] = -EOPNOTSUPP,
[EC_RES_ERROR] = -EIO,
[EC_RES_INVALID_PARAM] = -EINVAL,
[EC_RES_ACCESS_DENIED] = -EACCES,
[EC_RES_INVALID_RESPONSE] = -EPROTO,
[EC_RES_INVALID_VERSION] = -ENOPROTOOPT,
[EC_RES_INVALID_CHECKSUM] = -EBADMSG,
[EC_RES_IN_PROGRESS] = -EINPROGRESS,
[EC_RES_UNAVAILABLE] = -ENODATA,
[EC_RES_TIMEOUT] = -ETIMEDOUT,
[EC_RES_OVERFLOW] = -EOVERFLOW,
[EC_RES_INVALID_HEADER] = -EBADR,
[EC_RES_REQUEST_TRUNCATED] = -EBADR,
[EC_RES_RESPONSE_TOO_BIG] = -EFBIG,
[EC_RES_BUS_ERROR] = -EFAULT,
[EC_RES_BUSY] = -EBUSY,
[EC_RES_INVALID_HEADER_VERSION] = -EBADMSG,
[EC_RES_INVALID_HEADER_CRC] = -EBADMSG,
[EC_RES_INVALID_DATA_CRC] = -EBADMSG,
[EC_RES_DUP_UNAVAILABLE] = -ENODATA,
};
static int cros_ec_map_error(uint32_t result)
{
int ret = 0;
if (result != EC_RES_SUCCESS) {
if (result < ARRAY_SIZE(cros_ec_error_map) && cros_ec_error_map[result])
ret = cros_ec_error_map[result];
else
ret = -EPROTO;
}
return ret;
}
static int prepare_packet(struct cros_ec_device *ec_dev,
struct cros_ec_command *msg)
{
@ -579,26 +616,24 @@ static int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev,
*
* Return:
* >=0 - The number of bytes transferred
* -ENOPROTOOPT - Operation not supported
* -EPROTO - Protocol error
* <0 - Linux error code
*/
int cros_ec_cmd_xfer_status(struct cros_ec_device *ec_dev,
struct cros_ec_command *msg)
{
int ret;
int ret, mapped;
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_INVALID_VERSION) {
dev_dbg(ec_dev->dev, "Command invalid version (err:%d)\n",
msg->result);
return -ENOPROTOOPT;
} else if (msg->result != EC_RES_SUCCESS) {
dev_dbg(ec_dev->dev, "Command result (err: %d)\n", msg->result);
return -EPROTO;
return ret;
}
mapped = cros_ec_map_error(msg->result);
if (mapped) {
dev_dbg(ec_dev->dev, "Command result (err: %d [%d])\n",
msg->result, mapped);
ret = mapped;
}
return ret;
}
EXPORT_SYMBOL(cros_ec_cmd_xfer_status);