On Thu, Aug 11, 2022 at 08:26:37AM +0000, Wilken Gottwalt wrote:
> Add reporting if the PSU is running in single or multi rail mode via
> ocpmode debugfs entry. Also update the documentation and driver comments
> accordingly.
>
> Signed-off-by: Wilken Gottwalt <wilken.gottwalt@xxxxxxxxxx>
Applied to hwmon-next.
Thanks,
Guenter
> ---
> Changes in v3:
> - added more explanations in the driver
>
> Changes in v2:
> - fixed spelling issues in commit message
> ---
> Documentation/hwmon/corsair-psu.rst | 5 +++--
> drivers/hwmon/corsair-psu.c | 29 ++++++++++++++++++++++++++++-
> 2 files changed, 31 insertions(+), 3 deletions(-)
>
> diff --git a/Documentation/hwmon/corsair-psu.rst b/Documentation/hwmon/corsair-psu.rst
> index e8378e7a1d8c..c3a76305c587 100644
> --- a/Documentation/hwmon/corsair-psu.rst
> +++ b/Documentation/hwmon/corsair-psu.rst
> @@ -86,8 +86,9 @@ Debugfs entries
> ---------------
>
> ======================= ========================================================
> -uptime Current uptime of the psu
> +ocpmode Single or multi rail mode of the PCIe power connectors
> +product Product name of the psu
> +uptime Session uptime of the psu
> uptime_total Total uptime of the psu
> vendor Vendor name of the psu
> -product Product name of the psu
> ======================= ========================================================
> diff --git a/drivers/hwmon/corsair-psu.c b/drivers/hwmon/corsair-psu.c
> index 14389fd7afb8..c99e4c6afc2d 100644
> --- a/drivers/hwmon/corsair-psu.c
> +++ b/drivers/hwmon/corsair-psu.c
> @@ -55,6 +55,7 @@
> #define SECONDS_PER_DAY (SECONDS_PER_HOUR * 24)
> #define RAIL_COUNT 3 /* 3v3 + 5v + 12v */
> #define TEMP_COUNT 2
> +#define OCP_MULTI_RAIL 0x02
>
> #define PSU_CMD_SELECT_RAIL 0x00 /* expects length 2 */
> #define PSU_CMD_RAIL_VOLTS_HCRIT 0x40 /* the rest of the commands expect length 3 */
> @@ -71,9 +72,10 @@
> #define PSU_CMD_RAIL_WATTS 0x96
> #define PSU_CMD_VEND_STR 0x99
> #define PSU_CMD_PROD_STR 0x9A
> -#define PSU_CMD_TOTAL_WATTS 0xEE
> #define PSU_CMD_TOTAL_UPTIME 0xD1
> #define PSU_CMD_UPTIME 0xD2
> +#define PSU_CMD_OCPMODE 0xD8
> +#define PSU_CMD_TOTAL_WATTS 0xEE
> #define PSU_CMD_INIT 0xFE
>
> #define L_IN_VOLTS "v_in"
> @@ -268,6 +270,7 @@ static int corsairpsu_get_value(struct corsairpsu_data *priv, u8 cmd, u8 rail, l
> break;
> case PSU_CMD_TOTAL_UPTIME:
> case PSU_CMD_UPTIME:
> + case PSU_CMD_OCPMODE:
> *val = tmp;
> break;
> default:
> @@ -660,6 +663,29 @@ static int product_show(struct seq_file *seqf, void *unused)
> }
> DEFINE_SHOW_ATTRIBUTE(product);
>
> +static int ocpmode_show(struct seq_file *seqf, void *unused)
> +{
> + struct corsairpsu_data *priv = seqf->private;
> + long val;
> + int ret;
> +
> + /*
> + * The rail mode is switchable on the fly. The RAW interface can be used for this. But it
> + * will not be included here, because I consider it somewhat dangerous for the health of the
> + * PSU. The returned value can be a bogus one, if the PSU is in the process of switching and
> + * getting of the value itself can also fail during this. Because of this every other value
> + * than OCP_MULTI_RAIL can be considered as "single rail".
> + */
> + ret = corsairpsu_get_value(priv, PSU_CMD_OCPMODE, 0, &val);
> + if (ret < 0)
> + seq_puts(seqf, "N/A\n");
> + else
> + seq_printf(seqf, "%s\n", (val == OCP_MULTI_RAIL) ? "multi rail" : "single rail");
> +
> + return 0;
> +}
> +DEFINE_SHOW_ATTRIBUTE(ocpmode);
> +
> static void corsairpsu_debugfs_init(struct corsairpsu_data *priv)
> {
> char name[32];
> @@ -671,6 +697,7 @@ static void corsairpsu_debugfs_init(struct corsairpsu_data *priv)
> debugfs_create_file("uptime_total", 0444, priv->debugfs, priv, &uptime_total_fops);
> debugfs_create_file("vendor", 0444, priv->debugfs, priv, &vendor_fops);
> debugfs_create_file("product", 0444, priv->debugfs, priv, &product_fops);
> + debugfs_create_file("ocpmode", 0444, priv->debugfs, priv, &ocpmode_fops);
> }
>
> #else
