[discuss] getting acpi batteries and ac devices

[Alexander Pyhalov]

Hello.

I'm trying to get a list of acpi batteries and ac devices on the 
notebook.
I see them in /devices/pseudo:
$ ls -ld /devices/pseudo/acpi_drv\@0*
drwxr-xr-x 2 root sys       2 Dec 23  2014 /devices/pseudo/acpi_drv@0
crw-rw-rw- 1 root sys 3,  512 Dec 23 11:32 
/devices/pseudo/acpi_drv@0:ac0
crw-rw-rw- 1 root sys 3,  256 Dec 23 11:32 
/devices/pseudo/acpi_drv@0:battery0
crw-rw-rw- 1 root sys 3, 1280 Dec 23 11:34 
/devices/pseudo/acpi_drv@0:hotkey

But when I try to do it in C, I fail. The attached program shows only

In acpi_drv
/pseudo/acpi_drv@0
is_laptop=0

(no /dev/pseudo/acpi_drv@0:* as I would expected). What am I doing 
wrong?
--
System Administrator of Southern Federal University Computer Center
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#include <stdio.h>
#include <libdevinfo.h>
#include <limits.h>
#include <fcntl.h>
#include <sys/acpi_drv.h>

#define DEVFS_PREFIX "/devices"

static int
find_acpi_drv(di_node_t node, void *arg)
{
     int *pfound;

     pfound = (int *) arg;
     *pfound = 0;
     char * dn=di_driver_name(node);
     if (dn && !strcmp("acpi_drv",dn)) {
        di_devlink_handle_t devlink_hdl;
        di_minor_t minor;

	printf("In acpi_drv\n");
        puts(di_devfs_path(node));

        if ((devlink_hdl = di_devlink_init(NULL, 0)) == NULL) {
                printf("Can't init devlink_hdl");
                return DI_WALK_CONTINUE;
        }

        minor = DI_MINOR_NIL;
	while ((minor = di_minor_next(node, minor)) != DI_MINOR_NIL) {
            char *dp;
            char fdp[PATH_MAX];
            int fd;
            int pow;

            puts("In minor loop");
            dp=di_devfs_path(node);
            if (!dp) {
                printf("Couldn't get path for acpi_drv device");
                di_devlink_fini(&devlink_hdl);
                continue;
            }

            sprintf(fdp,"%s%s:%s",DEVFS_PREFIX,dp,di_minor_name(minor));
	    printf("fdp=%s\n", fdp);
            di_devfs_path_free(dp);
	}
        di_devlink_fini(&devlink_hdl);
     }
     return DI_WALK_CONTINUE;
}

int
up_native_is_laptop()
{
     int found;

     di_node_t root_node;

     errno = 0;
     if((root_node = di_init("/", DINFOSUBTREE)) == DI_NODE_NIL) {
           perror("di_init() failed");
           return 0;
     }
     di_walk_node(root_node, DI_WALK_CLDFIRST, &found, find_acpi_drv);
     di_fini(root_node);
     return found;
}

int
main()
{
     printf("is_laptop=%d\n", up_native_is_laptop());
     return 0;
}