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Date: Wed, 22 Nov 2017 07:23:19 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: eajames@...ux.vnet.ibm.com
Cc: linux-kernel@...r.kernel.org, linux-hwmon@...r.kernel.org,
devicetree@...r.kernel.org, linux-doc@...r.kernel.org,
jdelvare@...e.com, corbet@....net, mark.rutland@....com,
robh+dt@...nel.org, joel@....id.au,
"Edward A. James" <eajames@...ibm.com>
Subject: Re: [v3,10/12] hwmon (occ): Add non-hwmon attributes
On Mon, Nov 20, 2017 at 05:53:39PM -0600, eajames@...ux.vnet.ibm.com wrote:
> From: "Edward A. James" <eajames@...ibm.com>
>
> Create device attributes for additional OCC properties that do not
> belong as hwmon sensors. These provide additional information as to the
> state of the processor and system.
>
... and those attributes should really not be part of the hwmon driver.
> Signed-off-by: Edward A. James <eajames@...ibm.com>
> ---
> drivers/hwmon/occ/common.c | 93 ++++++++++++++++++++++++++++++++++++++++++++++
> drivers/hwmon/occ/common.h | 1 +
> drivers/hwmon/occ/p8_i2c.c | 10 +++++
> drivers/hwmon/occ/p9_sbe.c | 2 +
> 4 files changed, 106 insertions(+)
>
> diff --git a/drivers/hwmon/occ/common.c b/drivers/hwmon/occ/common.c
> index 337f286b..53e3592 100644
> --- a/drivers/hwmon/occ/common.c
> +++ b/drivers/hwmon/occ/common.c
> @@ -24,6 +24,14 @@
>
> #define OCC_FRU_TYPE_VRM 0x3
>
> +/* OCC status bits */
> +#define OCC_STAT_MASTER 0x80
> +#define OCC_STAT_ACTIVE 0x01
> +#define OCC_EXT_STAT_DVFS_OT 0x80
> +#define OCC_EXT_STAT_DVFS_POWER 0x40
> +#define OCC_EXT_STAT_MEM_THROTTLE 0x20
> +#define OCC_EXT_STAT_QUICK_DROP 0x10
> +
> /* OCC sensor type and version definitions */
>
> struct temp_sensor_1 {
> @@ -1108,6 +1116,81 @@ static int occ_setup_sensor_attrs(struct occ *occ)
> return 0;
> }
>
> +static ssize_t occ_show_status(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + int rc;
> + int val = 0;
> + struct occ *occ = dev_get_drvdata(dev);
> + struct occ_poll_response_header *header;
> + struct sensor_device_attribute *sattr = to_sensor_dev_attr(attr);
> +
> + rc = occ_update_response(occ);
> + if (rc)
> + return rc;
> +
> + header = (struct occ_poll_response_header *)occ->resp.data;
> +
> + switch (sattr->index) {
> + case 0:
> + val = (header->status & OCC_STAT_MASTER) ? 1 : 0;
> + break;
> + case 1:
> + val = (header->status & OCC_STAT_ACTIVE) ? 1 : 0;
> + break;
> + case 2:
> + val = (header->ext_status & OCC_EXT_STAT_DVFS_OT) ? 1 : 0;
> + break;
> + case 3:
> + val = (header->ext_status & OCC_EXT_STAT_DVFS_POWER) ? 1 : 0;
> + break;
> + case 4:
> + val = (header->ext_status & OCC_EXT_STAT_MEM_THROTTLE) ? 1 : 0;
> + break;
> + case 5:
> + val = (header->ext_status & OCC_EXT_STAT_QUICK_DROP) ? 1 : 0;
> + break;
> + case 6:
> + val = header->occ_state;
> + break;
> + case 7:
> + if (header->status & OCC_STAT_MASTER)
> + val = hweight8(header->occs_present);
> + else
> + val = 1;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + return snprintf(buf, PAGE_SIZE - 1, "%d\n", val);
> +}
> +
> +static SENSOR_DEVICE_ATTR(occ_master, 0444, occ_show_status, NULL, 0);
> +static SENSOR_DEVICE_ATTR(occ_active, 0444, occ_show_status, NULL, 1);
> +static SENSOR_DEVICE_ATTR(occ_dvfs_ot, 0444, occ_show_status, NULL, 2);
> +static SENSOR_DEVICE_ATTR(occ_dvfs_power, 0444, occ_show_status, NULL, 3);
> +static SENSOR_DEVICE_ATTR(occ_mem_throttle, 0444, occ_show_status, NULL, 4);
> +static SENSOR_DEVICE_ATTR(occ_quick_drop, 0444, occ_show_status, NULL, 5);
> +static SENSOR_DEVICE_ATTR(occ_status, 0444, occ_show_status, NULL, 6);
> +static SENSOR_DEVICE_ATTR(occs_present, 0444, occ_show_status, NULL, 7);
> +
> +static struct attribute *occ_attributes[] = {
> + &sensor_dev_attr_occ_master.dev_attr.attr,
> + &sensor_dev_attr_occ_active.dev_attr.attr,
> + &sensor_dev_attr_occ_dvfs_ot.dev_attr.attr,
> + &sensor_dev_attr_occ_dvfs_power.dev_attr.attr,
> + &sensor_dev_attr_occ_mem_throttle.dev_attr.attr,
> + &sensor_dev_attr_occ_quick_drop.dev_attr.attr,
> + &sensor_dev_attr_occ_status.dev_attr.attr,
> + &sensor_dev_attr_occs_present.dev_attr.attr,
> + NULL
> +};
> +
> +static const struct attribute_group occ_attr_group = {
> + .attrs = occ_attributes,
> +};
> +
> /* only need to do this once at startup, as OCC won't change sensors on us */
> static void occ_parse_poll_response(struct occ *occ)
> {
> @@ -1188,5 +1271,15 @@ int occ_setup(struct occ *occ, const char *name)
> return rc;
> }
>
> + rc = sysfs_create_group(&occ->bus_dev->kobj, &occ_attr_group);
> + if (rc)
> + dev_warn(occ->bus_dev, "failed to create status attrs: %d\n",
> + rc);
> +
> return 0;
> }
> +
> +void occ_shutdown(struct occ *occ)
> +{
> + sysfs_remove_group(&occ->bus_dev->kobj, &occ_attr_group);
> +}
> diff --git a/drivers/hwmon/occ/common.h b/drivers/hwmon/occ/common.h
> index 049c3b4..dc9e06d 100644
> --- a/drivers/hwmon/occ/common.h
> +++ b/drivers/hwmon/occ/common.h
> @@ -110,5 +110,6 @@ struct occ {
> };
>
> int occ_setup(struct occ *occ, const char *name);
> +void occ_shutdown(struct occ *occ);
>
> #endif /* OCC_COMMON_H */
> diff --git a/drivers/hwmon/occ/p8_i2c.c b/drivers/hwmon/occ/p8_i2c.c
> index 8032c0b..d719632 100644
> --- a/drivers/hwmon/occ/p8_i2c.c
> +++ b/drivers/hwmon/occ/p8_i2c.c
> @@ -230,6 +230,15 @@ static int p8_i2c_occ_probe(struct i2c_client *client,
> return occ_setup(occ, "p8_occ");
> }
>
> +static int p8_i2c_occ_remove(struct i2c_client *client)
> +{
> + struct occ *occ = dev_get_drvdata(&client->dev);
> +
> + occ_shutdown(occ);
> +
> + return 0;
> +}
> +
> static const struct of_device_id p8_i2c_occ_of_match[] = {
> { .compatible = "ibm,p8-occ-hwmon" },
> {}
> @@ -243,6 +252,7 @@ static int p8_i2c_occ_probe(struct i2c_client *client,
> .of_match_table = p8_i2c_occ_of_match,
> },
> .probe = p8_i2c_occ_probe,
> + .remove = p8_i2c_occ_remove,
> };
>
> module_i2c_driver(p8_i2c_occ_driver);
> diff --git a/drivers/hwmon/occ/p9_sbe.c b/drivers/hwmon/occ/p9_sbe.c
> index be3a469..7dbe4d5 100644
> --- a/drivers/hwmon/occ/p9_sbe.c
> +++ b/drivers/hwmon/occ/p9_sbe.c
> @@ -135,6 +135,8 @@ static int p9_sbe_occ_remove(struct platform_device *pdev)
> p9_sbe_occ->sbe = NULL;
> p9_sbe_occ_close_client(p9_sbe_occ);
>
> + occ_shutdown(occ);
> +
> return 0;
> }
>
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