default or selected kernelversion does not have config value CONFIG_BATTERY_TOSA.
Result is shown for kernelversion 6.9.9

Sharp SL-6000 (tosa) battery

modulename: tosa_battery.ko

configname: CONFIG_BATTERY_TOSA

Linux Kernel Configuration
└─>Device Drivers
└─>Power supply class support
└─>Sharp SL-6000 (tosa) battery
In linux kernel since version 2.6.27 (release Date: 2008-10-09)  
Say Y to enable support for the battery on the Sharp Zaurus
SL-6000 (tosa) models.

source code:
drivers/power/supply/tosa_battery.c