OPAL has its own list of return codes. The patch provides a translation
of such codes in errnos for the opal_sensor_read call.
Signed-off-by: Cédric Le Goater <c...@fr.ibm.com>
---
arch/powerpc/platforms/powernv/opal-sensor.c | 37 ++++++++++++++++++++++++++-
1 file changed, 36 insertions(+), 1 deletion(-)
Index: linux.git/arch/powerpc/platforms/powernv/opal-sensor.c
===================================================================
--- linux.git.orig/arch/powerpc/platforms/powernv/opal-sensor.c
+++ linux.git/arch/powerpc/platforms/powernv/opal-sensor.c
@@ -26,6 +26,38 @@
static DEFINE_MUTEX(opal_sensor_mutex);
+
+/*
+ * opal_sensor_read() return codes
+ *
+ * OPAL_PARAMETER - invalid sensor handler
+ * OPAL_UNSUPPORTED - plateform does not support reading sensors.
+ *
+ * in case of communication with the FSP on IBM systems
+ *
+ * OPAL_ASYNC_COMPLETION - a request was sent and an async completion will
+ * be triggered with the @token argument
+ * OPAL_PARTIAL - the request completed but the data returned is invalid
+ * OPAL_BUSY_EVENT - a previous request is still pending
+ * OPAL_NO_MEM - allocation failed
+ * OPAL_INTERNAL_ERROR - communication failure with the FSP
+ * OPAL_HARDWARE - FSP is not available
+ */
+static int convert_opal_code(int ret)
+{
+ switch (ret) {
+ case OPAL_SUCCESS: return 0;
+ case OPAL_PARAMETER: return -EINVAL;
+ case OPAL_UNSUPPORTED: return -ENOSYS;
+ case OPAL_ASYNC_COMPLETION: return -EAGAIN;
+ case OPAL_BUSY_EVENT: return -EBUSY;
+ case OPAL_NO_MEM: return -ENOMEM;
+ case OPAL_HARDWARE: return -ENOENT;
+ case OPAL_INTERNAL_ERROR: return -EIO;
+ default: return -EIO;
+ }
+}
+
/*
* This will return sensor information to driver based on the requested sensor
* handle. A handle is an opaque id for the powernv, read by the driver from
the
@@ -46,8 +78,10 @@ int opal_get_sensor_data(u32 sensor_hndl
mutex_lock(&opal_sensor_mutex);
ret = opal_sensor_read(sensor_hndl, token, &data);
- if (ret != OPAL_ASYNC_COMPLETION)
+ if (ret != OPAL_ASYNC_COMPLETION) {
+ ret = convert_opal_code(ret);
goto out_token;
+ }
ret = opal_async_wait_response(token, &msg);
if (ret) {
@@ -58,6 +92,7 @@ int opal_get_sensor_data(u32 sensor_hndl
*sensor_data = be32_to_cpu(data);
ret = be64_to_cpu(msg.params[1]);
+ ret = convert_opal_code(ret);
out_token:
mutex_unlock(&opal_sensor_mutex);
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