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Subject[PATCH 1/1] APM-EMULATION: apm_get_power_status() should be NULL on init [was: Advice on battery support]
APM-EMULATION: apm_get_power_status() should be NULL on init.

Signed-off-by: Rodolfo Giometti <>

If the function apm_get_info() do like this:

static int apm_get_info(char *buf, char **start, off_t fpos, int length)
struct apm_power_info info;
char *units;
int ret;
info.ac_line_status = 0xff;
info.battery_status = 0xff;
info.battery_flag = 0xff;
info.battery_life = -1;
info.time = -1;
info.units = -1;

if (apm_get_power_status)
we shouldn't set:

static void __apm_get_power_status(struct apm_power_info *info)
void (*apm_get_power_status)(struct apm_power_info *) = __apm_get_power_status;

otherwise the check is not needed. Furthermore setting the function to
NULL signals that the apm-emulation layer is not already assigned (I
found this very useful for my apm-emulation battery_class support).
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