[ndctl,2/4] ndctl: add ndctl_encode_smart_temperature()

Commit Message

Verma, Vishal L Feb. 8, 2018, 9:04 p.m. UTC

This provides for encoding of a human-readable temperature value into
the format expected by the smart command

Cc: Dan Williams <[e-mail]>
Signed-off-by: Vishal Verma <[e-mail]>
---
 ndctl/lib/libndctl.c   | 16 ++++++++++++++++
 ndctl/lib/libndctl.sym |  1 +
 ndctl/libndctl.h       |  1 +
 3 files changed, 18 insertions(+)

Patch

diff --git a/ndctl/lib/libndctl.c b/ndctl/lib/libndctl.c
index 4119a2e..ed5a65b 100644
--- a/ndctl/lib/libndctl.c
+++ b/ndctl/lib/libndctl.c
@@ -87,6 +87,22 @@  NDCTL_EXPORT double ndctl_decode_smart_temperature(unsigned int temp)
 	return t;
 }
 
+NDCTL_EXPORT unsigned int ndctl_encode_smart_temperature(double temp)
+{
+	bool negative = false;
+	unsigned int t;
+
+	if  (temp < 0) {
+		negative = true;
+		temp *= -1;
+	}
+	t = temp;
+	t *= 16;
+	if (negative)
+		t |= (1 << 15);
+	return t;
+}
+
 struct ndctl_ctx;
 
 /**
diff --git a/ndctl/lib/libndctl.sym b/ndctl/lib/libndctl.sym
index c160847..e7f9675 100644
--- a/ndctl/lib/libndctl.sym
+++ b/ndctl/lib/libndctl.sym
@@ -322,6 +322,7 @@  global:
 	ndctl_cmd_smart_threshold_set_ctrl_temperature;
 	ndctl_cmd_smart_threshold_set_spares;
 	ndctl_decode_smart_temperature;
+	ndctl_encode_smart_temperature;
 	ndctl_dimm_cmd_new_smart_inject;
 	ndctl_cmd_smart_inject_media_temperature;
 	ndctl_cmd_smart_inject_spares;
diff --git a/ndctl/libndctl.h b/ndctl/libndctl.h
index bd33d39..6091ff3 100644
--- a/ndctl/libndctl.h
+++ b/ndctl/libndctl.h
@@ -76,6 +76,7 @@  size_t ndctl_min_namespace_size(void);
 size_t ndctl_sizeof_namespace_index(void);
 size_t ndctl_sizeof_namespace_label(void);
 double ndctl_decode_smart_temperature(unsigned int temp);
+unsigned int ndctl_encode_smart_temperature(double temp);
 
 struct ndctl_ctx;
 struct ndctl_ctx *ndctl_ref(struct ndctl_ctx *ctx);