Function: battery-linux-proc-apm

battery-linux-proc-apm is a byte-compiled function defined in battery.el.gz.

Signature

(battery-linux-proc-apm)

Documentation

Get APM status information from Linux (the kernel).

This function works only with the new /proc/apm format introduced in Linux version 1.3.58.

The following %-sequences are provided:
%v Linux driver version
%V APM BIOS version
%I APM BIOS status (verbose)
%L AC line status (verbose)
%B Battery status (verbose)
%b Battery status, empty means high, - means low,
   ! means critical, and + means charging
%p Battery load percentage
%s Remaining time (to charge or discharge) in seconds
%m Remaining time (to charge or discharge) in minutes
%h Remaining time (to charge or discharge) in hours
%t Remaining time (to charge or discharge) in the form h:min

Source Code

;; Defined in /usr/src/emacs/lisp/battery.el.gz
(defun battery-linux-proc-apm ()
  "Get APM status information from Linux (the kernel).
This function works only with the new `/proc/apm' format introduced
in Linux version 1.3.58.

The following %-sequences are provided:
%v Linux driver version
%V APM BIOS version
%I APM BIOS status (verbose)
%L AC line status (verbose)
%B Battery status (verbose)
%b Battery status, empty means high, `-' means low,
   `!' means critical, and `+' means charging
%p Battery load percentage
%s Remaining time (to charge or discharge) in seconds
%m Remaining time (to charge or discharge) in minutes
%h Remaining time (to charge or discharge) in hours
%t Remaining time (to charge or discharge) in the form `h:min'"
  (let ( driver-version bios-version bios-interface line-status
         battery-status battery-status-symbol load-percentage
         seconds minutes hours remaining-time tem )
    (with-temp-buffer
      (ignore-errors (insert-file-contents "/proc/apm"))
      (when (re-search-forward (rx battery--linux-proc-apm) nil t)
	(setq driver-version (match-string 1))
	(setq bios-version (match-string 2))
	(setq tem (string-to-number (match-string 3) 16))
        (if (zerop (logand tem 2))
	    (setq bios-interface "not supported")
	  (setq bios-interface "enabled")
          (cond ((/= (logand tem 16) 0) (setq bios-interface "disabled"))
                ((/= (logand tem 32) 0) (setq bios-interface "disengaged")))
	  (setq tem (string-to-number (match-string 4) 16))
	  (cond ((= tem 0) (setq line-status "off-line"))
		((= tem 1) (setq line-status "on-line"))
		((= tem 2) (setq line-status "on backup")))
          (unless (= (string-to-number (match-string 6) 16) 255)
	    (setq tem (string-to-number (match-string 5) 16))
	    (cond ((= tem 0) (setq battery-status "high"
				   battery-status-symbol ""))
		  ((= tem 1) (setq battery-status "low"
				   battery-status-symbol "-"))
		  ((= tem 2) (setq battery-status "critical"
				   battery-status-symbol "!"))
		  ((= tem 3) (setq battery-status "charging"
				   battery-status-symbol "+")))
	    (setq load-percentage (match-string 7))
	    (setq seconds (string-to-number (match-string 8)))
	    (and (string-equal (match-string 9) "min")
		 (setq seconds (* 60 seconds)))
	    (setq minutes (/ seconds 60)
		  hours (/ seconds 3600))
	    (setq remaining-time
                  (format "%d:%02d" hours (% minutes 60)))))))
    (list (cons ?v (or driver-version "N/A"))
	  (cons ?V (or bios-version "N/A"))
	  (cons ?I (or bios-interface "N/A"))
	  (cons ?L (or line-status "N/A"))
	  (cons ?B (or battery-status "N/A"))
	  (cons ?b (or battery-status-symbol ""))
	  (cons ?p (or load-percentage "N/A"))
          (cons ?s (if seconds (number-to-string seconds) "N/A"))
          (cons ?m (if minutes (number-to-string minutes) "N/A"))
          (cons ?h (if hours (number-to-string hours) "N/A"))
	  (cons ?t (or remaining-time "N/A")))))