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authorTrent Piepho <tpiepho@impinj.com>2019-01-02 16:00:17 +0000
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2019-01-10 22:27:06 +0100
commitc8c97a4fb52c526be7a78c4c1e61a95cf1c915cc (patch)
treebfe8657eefa93687bf2953d0d8e5f3a6f0099dfa /drivers/rtc/rtc-isl1208.c
parent074b01a51d058f4216b7ce541e96b778aa6af60d (diff)
rtc: isl1208: fix negative digital trim reporting
isl1208_i2c_get_dtr() was returning the dtr value directly, but could also return a negative error code. Negative trimming values, e.g. -20, would get interpreted as an error code, e.g. -ENOTDIR. This patch offsets the dtr value by 100 so it's positive and won't alias an error code. Also fix check that considered a return value of -1 to be success. Cc: Alessandro Zummo <a.zummo@towertech.it> Cc: Alexandre Belloni <alexandre.belloni@bootlin.com> Signed-off-by: Trent Piepho <tpiepho@impinj.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'drivers/rtc/rtc-isl1208.c')
-rw-r--r--drivers/rtc/rtc-isl1208.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/rtc/rtc-isl1208.c b/drivers/rtc/rtc-isl1208.c
index 37ab3e1d25f5..263af3d8cd9f 100644
--- a/drivers/rtc/rtc-isl1208.c
+++ b/drivers/rtc/rtc-isl1208.c
@@ -161,6 +161,7 @@ isl1208_i2c_get_atr(struct i2c_client *client)
return atr;
}
+/* returns adjustment value + 100 */
static int
isl1208_i2c_get_dtr(struct i2c_client *client)
{
@@ -171,7 +172,7 @@ isl1208_i2c_get_dtr(struct i2c_client *client)
/* dtr encodes adjustments of {-60,-40,-20,0,20,40,60} ppm */
dtr = ((dtr & 0x3) * 20) * (dtr & (1 << 2) ? -1 : 1);
- return dtr;
+ return dtr + 100;
}
static int
@@ -248,8 +249,8 @@ isl1208_rtc_proc(struct device *dev, struct seq_file *seq)
(sr & ISL1208_REG_SR_RTCF) ? "bad" : "okay");
dtr = isl1208_i2c_get_dtr(client);
- if (dtr >= 0 - 1)
- seq_printf(seq, "digital_trim\t: %d ppm\n", dtr);
+ if (dtr >= 0)
+ seq_printf(seq, "digital_trim\t: %d ppm\n", dtr - 100);
atr = isl1208_i2c_get_atr(client);
if (atr >= 0)
@@ -637,7 +638,7 @@ isl1208_sysfs_show_dtrim(struct device *dev,
if (dtr < 0)
return dtr;
- return sprintf(buf, "%d ppm\n", dtr);
+ return sprintf(buf, "%d ppm\n", dtr - 100);
}
static DEVICE_ATTR(dtrim, S_IRUGO, isl1208_sysfs_show_dtrim, NULL);