firmware: arm_scpi: Extend to support sensors

ARM System Control Processor (SCP) provides an API to query and use
the sensors available in the system. Extend the SCPI driver to support
 sensor messages.

Signed-off-by: Punit Agrawal <punit.agrawal@arm.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>

diff --git a/drivers/firmware/arm_scpi.c b/drivers/firmware/arm_scpi.c
index cb75c750ca540f105c77a42c3eb8a758f352a149..6174db80c66361d2046a3548c6f5b14d36f8c999 100644 (file)
--- a/drivers/firmware/arm_scpi.c
+++ b/drivers/firmware/arm_scpi.c
@@ -219,6 +219,21 @@ struct dvfs_set {
        u8 index;
 } __packed;
 
+struct sensor_capabilities {
+       __le16 sensors;
+} __packed;
+
+struct _scpi_sensor_info {
+       __le16 sensor_id;
+       u8 class;
+       u8 trigger_type;
+       char name[20];
+};
+
+struct sensor_value {
+       __le32 val;
+} __packed;
+
 static struct scpi_drvinfo *scpi_info;
 
 static int scpi_linux_errmap[SCPI_ERR_MAX] = {
@@ -481,6 +496,48 @@ static struct scpi_dvfs_info *scpi_dvfs_get_info(u8 domain)
        return info;
 }
 
+static int scpi_sensor_get_capability(u16 *sensors)
+{
+       struct sensor_capabilities cap_buf;
+       int ret;
+
+       ret = scpi_send_message(SCPI_CMD_SENSOR_CAPABILITIES, NULL, 0, &cap_buf,
+                               sizeof(cap_buf));
+       if (!ret)
+               *sensors = le16_to_cpu(cap_buf.sensors);
+
+       return ret;
+}
+
+static int scpi_sensor_get_info(u16 sensor_id, struct scpi_sensor_info *info)
+{
+       __le16 id = cpu_to_le16(sensor_id);
+       struct _scpi_sensor_info _info;
+       int ret;
+
+       ret = scpi_send_message(SCPI_CMD_SENSOR_INFO, &id, sizeof(id),
+                               &_info, sizeof(_info));
+       if (!ret) {
+               memcpy(info, &_info, sizeof(*info));
+               info->sensor_id = le16_to_cpu(_info.sensor_id);
+       }
+
+       return ret;
+}
+
+int scpi_sensor_get_value(u16 sensor, u32 *val)
+{
+       struct sensor_value buf;
+       int ret;
+
+       ret = scpi_send_message(SCPI_CMD_SENSOR_VALUE, &sensor, sizeof(sensor),
+                               &buf, sizeof(buf));
+       if (!ret)
+               *val = le32_to_cpu(buf.val);
+
+       return ret;
+}
+
 static struct scpi_ops scpi_ops = {
        .get_version = scpi_get_version,
        .clk_get_range = scpi_clk_get_range,
@@ -489,6 +546,9 @@ static struct scpi_ops scpi_ops = {
        .dvfs_get_idx = scpi_dvfs_get_idx,
        .dvfs_set_idx = scpi_dvfs_set_idx,
        .dvfs_get_info = scpi_dvfs_get_info,
+       .sensor_get_capability = scpi_sensor_get_capability,
+       .sensor_get_info = scpi_sensor_get_info,
+       .sensor_get_value = scpi_sensor_get_value,
 };
 
 struct scpi_ops *get_scpi_ops(void)

diff --git a/include/linux/scpi_protocol.h b/include/linux/scpi_protocol.h
index e7169cd54e1976441e1f68dd8b57d8ad5247a1b5..80af3cd35ae4edf30dc05e1148cf8ee75033fcb3 100644 (file)
--- a/include/linux/scpi_protocol.h
+++ b/include/linux/scpi_protocol.h
@@ -28,6 +28,20 @@ struct scpi_dvfs_info {
        struct scpi_opp *opps;
 };
 
+enum scpi_sensor_class {
+       TEMPERATURE,
+       VOLTAGE,
+       CURRENT,
+       POWER,
+};
+
+struct scpi_sensor_info {
+       u16 sensor_id;
+       u8 class;
+       u8 trigger_type;
+       char name[20];
+} __packed;
+
 /**
  * struct scpi_ops - represents the various operations provided
  *     by SCP through SCPI message protocol
@@ -52,6 +66,9 @@ struct scpi_ops {
        int (*dvfs_get_idx)(u8);
        int (*dvfs_set_idx)(u8, u8);
        struct scpi_dvfs_info *(*dvfs_get_info)(u8);
+       int (*sensor_get_capability)(u16 *sensors);
+       int (*sensor_get_info)(u16 sensor_id, struct scpi_sensor_info *);
+       int (*sensor_get_value)(u16, u32 *);
 };
 
 #if IS_ENABLED(CONFIG_ARM_SCPI_PROTOCOL)