services: tlp: Add config variables for battery charging.

* gnu/services/pm.scm (tlp-configuration): Add start-charge-thresh-bat0,
stop-charge-thresh-bat0, start-charge-thresh-bat1, stop-charge-thresh-bat1.
* doc/guix.texi (Power Management Services): Document them.

Signed-off-by: Ricardo Wurmus <rekado@elephly.net>

1 files changed, 16 insertions, 0 deletions

diff --git a/gnu/services/pm.scm b/gnu/services/pm.scm
index d91f2b69ce7..3da3c0b961e 100644
--- a/gnu/services/pm.scm
+++ b/gnu/services/pm.scm
@@ -253,6 +253,22 @@ default, performance, powersave.")
    (string "powersave")
    "Same as @code{pcie-aspm-ac} but on BAT mode.")
 
+  (start-charge-thresh-bat0
+   (maybe-non-negative-integer 'disabled)
+   "Percentage when battery 0 should begin charging.")
+
+  (stop-charge-thresh-bat0
+   (maybe-non-negative-integer 'disabled)
+   "Percentage when battery 0 should stop charging.")
+
+  (start-charge-thresh-bat1
+   (maybe-non-negative-integer 'disabled)
+   "Percentage when battery 1 should begin charging.")
+
+  (stop-charge-thresh-bat1
+   (maybe-non-negative-integer 'disabled)
+   "Percentage when battery 1 should stop charging.")
+
   (radeon-power-profile-on-ac
    (string "high")
    "Radeon graphics clock speed level.  Alternatives are