linux-kernel - Re: [PATCH 1/4] hwmon: (occ) Add sysfs entry for IPS (Idle Power Saver) status

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Date:   Wed, 16 Feb 2022 06:10:31 +0000
From:   Joel Stanley <joel@....id.au>
To:     Eddie James <eajames@...ux.ibm.com>
Cc:     linux-hwmon@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Jean Delvare <jdelvare@...e.com>,
        Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH 1/4] hwmon: (occ) Add sysfs entry for IPS (Idle Power
 Saver) status

On Tue, 15 Feb 2022 at 15:11, Eddie James <eajames@...ux.ibm.com> wrote:
>
> BMC control applications need to check the Idle Power Saver status
> byte returned by the OCC poll response, so export it in sysfs with
> the other OCC-specific data.
>
> Signed-off-by: Eddie James <eajames@...ux.ibm.com>

Reviewed-by: Joel Stanley <joel@....id.au>

> ---
>  drivers/hwmon/occ/common.h |  1 +
>  drivers/hwmon/occ/sysfs.c  | 11 +++++++++++
>  2 files changed, 12 insertions(+)
>
> diff --git a/drivers/hwmon/occ/common.h b/drivers/hwmon/occ/common.h
> index 5020117be740..a88c66d36e38 100644
> --- a/drivers/hwmon/occ/common.h
> +++ b/drivers/hwmon/occ/common.h
> @@ -119,6 +119,7 @@ struct occ {
>         u8 prev_stat;
>         u8 prev_ext_stat;
>         u8 prev_occs_present;
> +       u8 prev_ips_status;
>  };
>
>  int occ_setup(struct occ *occ, const char *name);
> diff --git a/drivers/hwmon/occ/sysfs.c b/drivers/hwmon/occ/sysfs.c
> index 03b16abef67f..6dc69c9aa4c2 100644
> --- a/drivers/hwmon/occ/sysfs.c
> +++ b/drivers/hwmon/occ/sysfs.c
> @@ -63,6 +63,9 @@ static ssize_t occ_sysfs_show(struct device *dev,
>                 else
>                         val = 1;
>                 break;
> +       case 8:
> +               val = header->ips_status;
> +               break;
>         default:
>                 return -EINVAL;
>         }
> @@ -88,6 +91,7 @@ static SENSOR_DEVICE_ATTR(occ_mem_throttle, 0444, occ_sysfs_show, NULL, 4);
>  static SENSOR_DEVICE_ATTR(occ_quick_pwr_drop, 0444, occ_sysfs_show, NULL, 5);
>  static SENSOR_DEVICE_ATTR(occ_state, 0444, occ_sysfs_show, NULL, 6);
>  static SENSOR_DEVICE_ATTR(occs_present, 0444, occ_sysfs_show, NULL, 7);
> +static SENSOR_DEVICE_ATTR(occ_ips_status, 0444, occ_sysfs_show, NULL, 8);
>  static DEVICE_ATTR_RO(occ_error);
>
>  static struct attribute *occ_attributes[] = {
> @@ -99,6 +103,7 @@ static struct attribute *occ_attributes[] = {
>         &sensor_dev_attr_occ_quick_pwr_drop.dev_attr.attr,
>         &sensor_dev_attr_occ_state.dev_attr.attr,
>         &sensor_dev_attr_occs_present.dev_attr.attr,
> +       &sensor_dev_attr_occ_ips_status.dev_attr.attr,
>         &dev_attr_occ_error.attr,
>         NULL
>  };
> @@ -162,6 +167,11 @@ void occ_sysfs_poll_done(struct occ *occ)
>                 sysfs_notify(&occ->bus_dev->kobj, NULL, name);
>         }
>
> +       if (header->ips_status != occ->prev_ips_status) {
> +               name = sensor_dev_attr_occ_ips_status.dev_attr.attr.name;
> +               sysfs_notify(&occ->bus_dev->kobj, NULL, name);
> +       }
> +
>         if (occ->error && occ->error != occ->prev_error) {
>                 name = dev_attr_occ_error.attr.name;
>                 sysfs_notify(&occ->bus_dev->kobj, NULL, name);
> @@ -174,6 +184,7 @@ void occ_sysfs_poll_done(struct occ *occ)
>         occ->prev_stat = header->status;
>         occ->prev_ext_stat = header->ext_status;
>         occ->prev_occs_present = header->occs_present;
> +       occ->prev_ips_status = header->ips_status;
>  }
>
>  int occ_setup_sysfs(struct occ *occ)
> --
> 2.27.0
>