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platform/chrome: wilco_ec: Add version sysfs entries 

Add the ability to extract version information from the EC.

Example Output:
$ cd /sys/bus/platform/devices/GOOG000C:00
$ tail build_date build_revision version model_number
==> build_date <==
04/25/19

==> build_revision <==
d2592cae0

==> version <==
00.00.14

==> model_number <==
08B6

Signed-off-by: Raul E Rangel <rrangel@chromium.org>
Reviewed-by: Nick Crews <ncrews@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
This commit is contained in:
Raul E Rangel 2019-06-03 12:16:49 -06:00 committed by Enric Balletbo i Serra
parent 1210d1e6ba
commit 79e3f1d3db
2 changed files with 110 additions and 0 deletions
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31
Documentation/ABI/testing/sysfs-platform-wilco-ec
View File

@ -7,3 +7,34 @@ Description:
want to run their device headless or with a dock.
Input should be parseable by kstrtou8() to 0 or 1.
What: /sys/bus/platform/devices/GOOG000C\:00/build_date
Date: May 2019
KernelVersion: 5.3
Description:
Display Wilco Embedded Controller firmware build date.
Output will a MM/DD/YY string.
What: /sys/bus/platform/devices/GOOG000C\:00/build_revision
Date: May 2019
KernelVersion: 5.3
Description:
Display Wilco Embedded Controller build revision.
Output will a version string be similar to the example below:
d2592cae0
What: /sys/bus/platform/devices/GOOG000C\:00/model_number
Date: May 2019
KernelVersion: 5.3
Description:
Display Wilco Embedded Controller model number.
Output will a version string be similar to the example below:
08B6
What: /sys/bus/platform/devices/GOOG000C\:00/version
Date: May 2019
KernelVersion: 5.3
Description:
Display Wilco Embedded Controller firmware version.
The format of the string is x.y.z. Where x is major, y is minor
and z is the build number. For example: 95.00.06

79
drivers/platform/chrome/wilco_ec/sysfs.c
View File

@ -23,6 +23,25 @@ struct boot_on_ac_request {
u8 reserved7;
} __packed;
#define CMD_EC_INFO 0x38
enum get_ec_info_op {
CMD_GET_EC_LABEL = 0,
CMD_GET_EC_REV = 1,
CMD_GET_EC_MODEL = 2,
CMD_GET_EC_BUILD_DATE = 3,
};
struct get_ec_info_req {
u8 cmd; /* Always CMD_EC_INFO */
u8 reserved;
u8 op; /* One of enum get_ec_info_op */
} __packed;
struct get_ec_info_resp {
u8 reserved[2];
char value[9]; /* __nonstring: might not be null terminated */
} __packed;
static ssize_t boot_on_ac_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
@ -57,8 +76,68 @@ static ssize_t boot_on_ac_store(struct device *dev,
static DEVICE_ATTR_WO(boot_on_ac);
static ssize_t get_info(struct device *dev, char *buf, enum get_ec_info_op op)
{
struct wilco_ec_device *ec = dev_get_drvdata(dev);
struct get_ec_info_req req = { .cmd = CMD_EC_INFO, .op = op };
struct get_ec_info_resp resp;
int ret;
struct wilco_ec_message msg = {
.type = WILCO_EC_MSG_LEGACY,
.request_data = &req,
.request_size = sizeof(req),
.response_data = &resp,
.response_size = sizeof(resp),
};
ret = wilco_ec_mailbox(ec, &msg);
if (ret < 0)
return ret;
return scnprintf(buf, PAGE_SIZE, "%.*s\n", (int)sizeof(resp.value),
(char *)&resp.value);
}
static ssize_t version_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
return get_info(dev, buf, CMD_GET_EC_LABEL);
}
static DEVICE_ATTR_RO(version);
static ssize_t build_revision_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return get_info(dev, buf, CMD_GET_EC_REV);
}
static DEVICE_ATTR_RO(build_revision);
static ssize_t build_date_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return get_info(dev, buf, CMD_GET_EC_BUILD_DATE);
}
static DEVICE_ATTR_RO(build_date);
static ssize_t model_number_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
return get_info(dev, buf, CMD_GET_EC_MODEL);
}
static DEVICE_ATTR_RO(model_number);
static struct attribute *wilco_dev_attrs[] = {
&dev_attr_boot_on_ac.attr,
&dev_attr_build_date.attr,
&dev_attr_build_revision.attr,
&dev_attr_model_number.attr,
&dev_attr_version.attr,
NULL,
};