lkml.org 
[lkml]   [2019]   [Oct]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.19 029/114] power: supply: sbs-battery: only return health when battery present
Date
From: Michael Nosthoff <committed@heine.so>

commit fe55e770327363304c4111423e6f7ff3c650136d upstream.

when the battery is set to sbs-mode and no gpio detection is enabled
"health" is always returning a value even when the battery is not present.
All other fields return "not present".
This leads to a scenario where the driver is constantly switching between
"present" and "not present" state. This generates a lot of constant
traffic on the i2c.

This commit changes the response of "health" to an error when the battery
is not responding leading to a consistent "not present" state.

Fixes: 76b16f4cdfb8 ("power: supply: sbs-battery: don't assume MANUFACTURER_DATA formats")
Cc: <stable@vger.kernel.org>
Signed-off-by: Michael Nosthoff <committed@heine.so>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Tested-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/power/supply/sbs-battery.c | 25 ++++++++++++++++---------
1 file changed, 16 insertions(+), 9 deletions(-)

--- a/drivers/power/supply/sbs-battery.c
+++ b/drivers/power/supply/sbs-battery.c
@@ -323,17 +323,22 @@ static int sbs_get_battery_presence_and_
{
int ret;

- if (psp == POWER_SUPPLY_PROP_PRESENT) {
- /* Dummy command; if it succeeds, battery is present. */
- ret = sbs_read_word_data(client, sbs_data[REG_STATUS].addr);
- if (ret < 0)
- val->intval = 0; /* battery disconnected */
- else
- val->intval = 1; /* battery present */
- } else { /* POWER_SUPPLY_PROP_HEALTH */
+ /* Dummy command; if it succeeds, battery is present. */
+ ret = sbs_read_word_data(client, sbs_data[REG_STATUS].addr);
+
+ if (ret < 0) { /* battery not present*/
+ if (psp == POWER_SUPPLY_PROP_PRESENT) {
+ val->intval = 0;
+ return 0;
+ }
+ return ret;
+ }
+
+ if (psp == POWER_SUPPLY_PROP_PRESENT)
+ val->intval = 1; /* battery present */
+ else /* POWER_SUPPLY_PROP_HEALTH */
/* SBS spec doesn't have a general health command. */
val->intval = POWER_SUPPLY_HEALTH_UNKNOWN;
- }

return 0;
}
@@ -635,6 +640,8 @@ static int sbs_get_property(struct power
else
ret = sbs_get_battery_presence_and_health(client, psp,
val);
+
+ /* this can only be true if no gpio is used */
if (psp == POWER_SUPPLY_PROP_PRESENT)
return 0;
break;

\
 
 \ /
  Last update: 2019-10-10 10:59    [W:0.477 / U:1.340 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site