lkml.org 
[lkml]   [2019]   [Jul]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] power/supply: ingenic-battery: Don't change scale if there's only one
Date
The ADC in the JZ4740 can work either in high-precision mode with a 2.5V
range, or in low-precision mode with a 7.5V range. The code in place in
this driver will select the proper scale according to the maximum
voltage of the battery.

The JZ4770 however only has one mode, with a 6.6V range. If only one
scale is available, there's no need to change it (and nothing to change
it to), and trying to do so will fail with -EINVAL.

Fixes commit fb24ccfbe1e0 ("power: supply: add Ingenic JZ47xx battery
driver.")

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Cc: stable@vger.kernel.org
---
drivers/power/supply/ingenic-battery.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/power/supply/ingenic-battery.c b/drivers/power/supply/ingenic-battery.c
index 35816d4b3012..5a53057b4f64 100644
--- a/drivers/power/supply/ingenic-battery.c
+++ b/drivers/power/supply/ingenic-battery.c
@@ -80,6 +80,10 @@ static int ingenic_battery_set_scale(struct ingenic_battery *bat)
if (ret != IIO_AVAIL_LIST || scale_type != IIO_VAL_FRACTIONAL_LOG2)
return -EINVAL;

+ /* Only one (fractional) entry - nothing to change */
+ if (scale_len == 2)
+ return 0;
+
max_mV = bat->info.voltage_max_design_uv / 1000;

for (i = 0; i < scale_len; i += 2) {
--
2.21.0.593.g511ec345e18
\
 
 \ /
  Last update: 2019-07-23 04:46    [W:0.053 / U:9.056 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site