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firmware: arm_scmi: fetch and store sensor scale

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In preparation for dealing with scales within the SCMI HWMON driver,
fetch and store the sensor unit scale into the scmi_sensor_info
structure. In order to simplify computations for upper layer, take care
of sign extending the scale to a full 8-bit signed value.

Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
[sudeep.holla: update bitfield values as per specification]
Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>
This commit is contained in:
Florian Fainelli 2019-05-08 11:46:34 -07:00 committed by Sudeep Holla
parent c0759b9b5d
commit 0b673b6486
2 changed files with 7 additions and 0 deletions
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6
drivers/firmware/arm_scmi/sensors.c
View File

@ -34,6 +34,8 @@ struct scmi_msg_resp_sensor_description {
__le32 attributes_high;
#define SENSOR_TYPE(x) ((x) & 0xff)
#define SENSOR_SCALE(x) (((x) >> 11) & 0x1f)
#define SENSOR_SCALE_SIGN BIT(4)
#define SENSOR_SCALE_EXTEND GENMASK(7, 5)
#define SENSOR_UPDATE_SCALE(x) (((x) >> 22) & 0x1f)
#define SENSOR_UPDATE_BASE(x) (((x) >> 27) & 0x1f)
u8 name[SCMI_MAX_STR_SIZE];
@ -140,6 +142,10 @@ static int scmi_sensor_description_get(const struct scmi_handle *handle,
s = &si->sensors[desc_index + cnt];
s->id = le32_to_cpu(buf->desc[cnt].id);
s->type = SENSOR_TYPE(attrh);
s->scale = SENSOR_SCALE(attrh);
/* Sign extend to a full s8 */
if (s->scale & SENSOR_SCALE_SIGN)
s->scale |= SENSOR_SCALE_EXTEND;
strlcpy(s->name, buf->desc[cnt].name, SCMI_MAX_STR_SIZE);
}

1
include/linux/scmi_protocol.h
View File

@ -144,6 +144,7 @@ struct scmi_power_ops {
struct scmi_sensor_info {
u32 id;
u8 type;
s8 scale;
char name[SCMI_MAX_STR_SIZE];
};