Add support for reporting Source and Sink Capabilities
Power Data Object (PDO) property. These are reported by USB
Power Delivery (PD) capable power sources.
Signed-off-by: Prashant Malani <pmalani@xxxxxxxxxxxx>
---
Documentation/ABI/testing/sysfs-class-power | 30 +++++++++++++++++++++
drivers/power/supply/power_supply_sysfs.c | 18 ++++++++++++-
include/linux/power_supply.h | 5 ++++
3 files changed, 52 insertions(+), 1 deletion(-)
diff --git a/Documentation/ABI/testing/sysfs-class-power b/Documentation/ABI/testing/sysfs-class-power
index ca830c6cd809..90d4198e6dfb 100644
--- a/Documentation/ABI/testing/sysfs-class-power
+++ b/Documentation/ABI/testing/sysfs-class-power
@@ -562,6 +562,36 @@ Description:
"Unknown", "SDP", "DCP", "CDP", "ACA", "C", "PD",
"PD_DRP", "PD_PPS", "BrickID"
+What: /sys/class/power_supply/<supply_name>/source_cap_pdos
+Date: September 2021
+Contact: linux-pm@xxxxxxxxxxxxxxx
+Description:
+ Reports the Source Capabilities Power Data Objects (PDO) reported by the USB
+ PD-capable power source. 13 PDOs are listed. PDOs 1-7 represent the Source Caps
+ for devices which only support Standard Power Range (SPR), whereas PDOs 8-13
+ are for Extended Power Range (EPR) capable sources.
+ NOTE: The EPR Source Caps message is a superset of the Source Cap message, so on
+ SPR-only sources, PDOs 8-13 will be 0.
+
+ Access: Read-Only
+
+ Valid values: Represented as a list of 13 32-bit PDO objects in hexadecimal format.
+
+What: /sys/class/power_supply/<supply_name>/sink_cap_pdos
+Date: September 2021
+Contact: linux-pm@xxxxxxxxxxxxxxx
+Description:
+ Reports the Sink Capabilities Power Data Objects (PDO) reported by the USB
+ PD-capable power source. 13 PDOs are listed. PDOs 1-7 represent the Sink Caps
+ for devices which only support Standard Power Range (SPR), whereas PDOs 8-13
+ are for Extended Power Range (EPR) capable sinks.
+ NOTE: The EPR Sink Caps message is a superset of the Sink Cap message, so on
+ SPR-only sinks, PDOs 8-13 will be 0.
+
+ Access: Read-Only
+
+ Valid values: Represented as a list of 13 32-bit PDO objects in hexadecimal format.
+
**Device Specific Properties**
What: /sys/class/power/ds2760-battery.*/charge_now
diff --git a/drivers/power/supply/power_supply_sysfs.c b/drivers/power/supply/power_supply_sysfs.c
index c3d7cbcd4fad..9d17d3376949 100644
--- a/drivers/power/supply/power_supply_sysfs.c
+++ b/drivers/power/supply/power_supply_sysfs.c
@@ -211,6 +211,9 @@ static struct power_supply_attr power_supply_attrs[] = {
POWER_SUPPLY_ATTR(MODEL_NAME),
POWER_SUPPLY_ATTR(MANUFACTURER),
POWER_SUPPLY_ATTR(SERIAL_NUMBER),
+ /* Array properties */
+ POWER_SUPPLY_ATTR(SINK_CAP_PDOS),
+ POWER_SUPPLY_ATTR(SOURCE_CAP_PDOS),
};
static struct attribute *
@@ -267,7 +270,11 @@ static ssize_t power_supply_show_property(struct device *dev,
struct power_supply *psy = dev_get_drvdata(dev);
struct power_supply_attr *ps_attr = to_ps_attr(attr);
enum power_supply_property psp = dev_attr_psp(attr);
- union power_supply_propval value;
+ union power_supply_propval value = {
+ .pdos = {0}
+ };
+ size_t count;
+ int i;
if (psp == POWER_SUPPLY_PROP_TYPE) {
value.intval = psy->desc->type;
@@ -299,6 +306,15 @@ static ssize_t power_supply_show_property(struct device *dev,
case POWER_SUPPLY_PROP_MODEL_NAME ... POWER_SUPPLY_PROP_SERIAL_NUMBER:
ret = sprintf(buf, "%s\n", value.strval);
break;
+ case POWER_SUPPLY_PROP_SINK_CAP_PDOS:
+ case POWER_SUPPLY_PROP_SOURCE_CAP_PDOS:
+ ret = 0;
+ for (i = 0; i < PDO_MAX_OBJECTS; i++) {
+ count = sprintf(buf, "0x%08x\n", value.pdos[i]);
+ buf += count;
+ ret += count;
+ }
+ break;
default:
ret = sprintf(buf, "%d\n", value.intval);
}
diff --git a/include/linux/power_supply.h b/include/linux/power_supply.h
index 9ca1f120a211..a53c8fa4c1c9 100644
--- a/include/linux/power_supply.h
+++ b/include/linux/power_supply.h
@@ -17,6 +17,7 @@
#include <linux/leds.h>
#include <linux/spinlock.h>
#include <linux/notifier.h>
+#include <linux/usb/pd.h>
/*
* All voltages, currents, charges, energies, time and temperatures in uV,
@@ -171,6 +172,9 @@ enum power_supply_property {
POWER_SUPPLY_PROP_MODEL_NAME,
POWER_SUPPLY_PROP_MANUFACTURER,
POWER_SUPPLY_PROP_SERIAL_NUMBER,
+ /* Array properties */
+ POWER_SUPPLY_PROP_SINK_CAP_PDOS,
+ POWER_SUPPLY_PROP_SOURCE_CAP_PDOS,
};
enum power_supply_type {
@@ -209,6 +213,7 @@ enum power_supply_notifier_events {
union power_supply_propval {
int intval;
const char *strval;
+ u32 pdos[PDO_MAX_OBJECTS];
};
struct device_node;
--
2.33.0.153.gba50c8fa24-goog
