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Subject[PATCH v6 11/13] firmware: arm_scmi: Add Sensor notifications support
Date
Make SCMI Sensor protocol register with the notification core.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Cristian Marussi <cristian.marussi@arm.com>
---
V5 --> V6
- added handle argument to fill_custom_report()
V4 --> V5
- fixed unsual return construct
V3 --> V4
- scmi_event field renamed
V2 --> V3
- added handle awareness
V1 --> V2
- simplified .set_notify_enabled() implementation moving the ALL_SRCIDs
logic out of protocol. ALL_SRCIDs logic is now in charge of the
notification core, together with proper reference counting of enables
- switched to devres protocol-registration
---
drivers/firmware/arm_scmi/sensors.c | 70 +++++++++++++++++++++++++++++
include/linux/scmi_protocol.h | 7 +++
2 files changed, 77 insertions(+)

diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c
index db1b1ab303da..7ffd633ada9a 100644
--- a/drivers/firmware/arm_scmi/sensors.c
+++ b/drivers/firmware/arm_scmi/sensors.c
@@ -6,6 +6,7 @@
*/

#include "common.h"
+#include "notify.h"

enum scmi_sensor_protocol_cmd {
SENSOR_DESCRIPTION_GET = 0x3,
@@ -71,6 +72,12 @@ struct scmi_msg_sensor_reading_get {
#define SENSOR_READ_ASYNC BIT(0)
};

+struct scmi_sensor_trip_notify_payld {
+ __le32 agent_id;
+ __le32 sensor_id;
+ __le32 trip_point_desc;
+};
+
struct sensors_info {
u32 version;
int num_sensors;
@@ -276,6 +283,63 @@ static struct scmi_sensor_ops sensor_ops = {
.reading_get = scmi_sensor_reading_get,
};

+static bool scmi_sensor_set_notify_enabled(const struct scmi_handle *handle,
+ u8 evt_id, u32 src_id, bool enable)
+{
+ int ret;
+
+ ret = scmi_sensor_trip_point_notify(handle, src_id, enable);
+ if (ret)
+ pr_warn("SCMI Notifications - Proto:%X - FAIL_ENABLED - evt[%X] dom[%d] - ret:%d\n",
+ SCMI_PROTOCOL_SENSOR, evt_id, src_id, ret);
+
+ return !ret;
+}
+
+static void *scmi_sensor_fill_custom_report(const struct scmi_handle *handle,
+ u8 evt_id, u64 timestamp,
+ const void *payld, size_t payld_sz,
+ void *report, u32 *src_id)
+{
+ void *rep = NULL;
+
+ switch (evt_id) {
+ case SENSOR_TRIP_POINT_EVENT:
+ {
+ const struct scmi_sensor_trip_notify_payld *p = payld;
+ struct scmi_sensor_trip_point_report *r = report;
+
+ if (sizeof(*p) != payld_sz)
+ break;
+
+ r->timestamp = timestamp;
+ r->agent_id = le32_to_cpu(p->agent_id);
+ r->sensor_id = le32_to_cpu(p->sensor_id);
+ r->trip_point_desc = le32_to_cpu(p->trip_point_desc);
+ *src_id = r->sensor_id;
+ rep = r;
+ break;
+ }
+ default:
+ break;
+ }
+
+ return rep;
+}
+
+static const struct scmi_event sensor_events[] = {
+ {
+ .id = SENSOR_TRIP_POINT_EVENT,
+ .max_payld_sz = 12,
+ .max_report_sz = sizeof(struct scmi_sensor_trip_point_report),
+ },
+};
+
+static const struct scmi_protocol_event_ops sensor_event_ops = {
+ .set_notify_enabled = scmi_sensor_set_notify_enabled,
+ .fill_custom_report = scmi_sensor_fill_custom_report,
+};
+
static int scmi_sensors_protocol_init(struct scmi_handle *handle)
{
u32 version;
@@ -299,6 +363,12 @@ static int scmi_sensors_protocol_init(struct scmi_handle *handle)

scmi_sensor_description_get(handle, sinfo);

+ scmi_register_protocol_events(handle,
+ SCMI_PROTOCOL_SENSOR, PAGE_SIZE,
+ &sensor_event_ops, sensor_events,
+ ARRAY_SIZE(sensor_events),
+ sinfo->num_sensors);
+
sinfo->version = version;
handle->sensor_ops = &sensor_ops;
handle->sensor_priv = sinfo;
diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h
index 70aaf1c86901..0f40ecd0609c 100644
--- a/include/linux/scmi_protocol.h
+++ b/include/linux/scmi_protocol.h
@@ -404,4 +404,11 @@ struct scmi_perf_level_report {
u32 performance_level;
};

+struct scmi_sensor_trip_point_report {
+ ktime_t timestamp;
+ u32 agent_id;
+ u32 sensor_id;
+ u32 trip_point_desc;
+};
+
#endif /* _LINUX_SCMI_PROTOCOL_H */
--
2.17.1
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