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SubjectRe: [PATCH v2] platform/chrome: wilco_ec: Add version sysfs entries
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Nick,

On 3/6/19 20:16, Raul E Rangel wrote:
> 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>

Can I get your rb here?

Thanks,
Enric

> ---
> This patch is rebased on chromeos-platform/for-next. It was originally
> developed on the chromiumos 4.19 kernel which has the following patch
> applied: https://lore.kernel.org/patchwork/patch/1062995/. That patch is
> not currently upstream.
>
> Changes in v2:
> - Removed version directory
> - Renamed label to version
> - Sorted documentation
>
> .../ABI/testing/sysfs-platform-wilco-ec | 31 ++++++++
> drivers/platform/chrome/wilco_ec/sysfs.c | 79 +++++++++++++++++++
> 2 files changed, 110 insertions(+)
>
> diff --git a/Documentation/ABI/testing/sysfs-platform-wilco-ec b/Documentation/ABI/testing/sysfs-platform-wilco-ec
> index 8e5d6eee44db2..8827a734f9331 100644
> --- a/Documentation/ABI/testing/sysfs-platform-wilco-ec
> +++ b/Documentation/ABI/testing/sysfs-platform-wilco-ec
> @@ -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
> diff --git a/drivers/platform/chrome/wilco_ec/sysfs.c b/drivers/platform/chrome/wilco_ec/sysfs.c
> index f84f0480460ae..3b86a21005d3e 100644
> --- a/drivers/platform/chrome/wilco_ec/sysfs.c
> +++ b/drivers/platform/chrome/wilco_ec/sysfs.c
> @@ -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,
> };
>
>

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