ref: 35e098ab338ace63bb8e789f4b25e919d7353668
parent: 9b7ed2484d9f956762b2822f1223ec1f505410cf
author: qwx <qwx@sciops.net>
date: Mon Aug 15 15:55:16 EDT 2022
br: rewrite using sigrid's and ori's ideas
--- a/bin/br
+++ b/bin/br
@@ -1,14 +1,85 @@
#!/bin/rc
-# SBLC_PWM_CTL2: bytes 15:0, range 0 (off) to v>>16 (full)
-
-if(! ~ $#* 1){- echo usage: $0 factor
- exit 'usage'
+rfork e
+if(! ~ $#* 1 || {test $1 -lt 0 || test $1 -gt 100}){+ echo usage: $0 [percent]
+ exit usage >[1=2]
}
-v=`{seg -Lr igfxmmio 0x400000 0xc8254}-if(~ $#v 0)
- exit 'no such named segment'
-v=`{echo 'v='$v'; v & ~0xffff | ((v>>16) / '$1')' | pc -n}-if(! ~ $#v 1)
- exit 'invalid factor'
-seg -Lw igfxmmio 0x400000 0x48254 $v
+pci | awk -v 'fac='$1 '
+function pipe(cmd, v){+ cmd | getline v
+ close(cmd)
+ return v
+}
+BEGIN{+ # intel graphics
+ vid["8086"] = "igfx"
+ # gm15 (doesn't work on t43p)
+ did["8086/2592","r"] = "0x61254"; did["8086/2592","w"] = "0x61254"
+ # gm45
+ did["8086/27ae","r"] = "0x61254"; did["8086/27ae","w"] = "0x61254"
+ did["8086/27a2","r"] = "0x61254"; did["8086/27a2","w"] = "0x61254"
+ # gm965
+ did["8086/29a2","r"] = "0x61254"; did["8086/29a2","w"] = "0x61254"
+ did["8086/2a02","r"] = "0x61254"; did["8086/2a02","w"] = "0x61254"
+ did["8086/2a42","r"] = "0x61254"; did["8086/2a42","w"] = "0x61254"
+ did["8086/a011","r"] = "0x61254"; did["8086/a011","w"] = "0x61254"
+ # sandy bridge
+ did["8086/0046","r"] = "0xc8254"; did["8086/0046","w"] = "0x48254"
+ did["8086/0102","r"] = "0xc8254"; did["8086/0102","w"] = "0xc8254"
+ # works on x220, not on w520
+ did["8086/0126","r"] = "0xc8254"; did["8086/0126","w"] = "0x48254"
+ # ivy bridge
+ did["8086/0152","r"] = "0x48254"; did["8086/0152","w"] = "0x48254"
+ did["8086/0166","r"] = "0x48254"; did["8086/0166","w"] = "0x48254"
+ # haswell
+ did["8086/0412","r"] = "0xc8254"; did["8086/0412","w"] = "0x48254"
+ did["8086/041a","r"] = "0xc8254"; did["8086/041a","w"] = "0x48254"
+ did["8086/0a06","r"] = "0xc8254"; did["8086/0a06","w"] = "0x48254"
+ did["8086/0a16","r"] = "0xc8254"; did["8086/0a16","w"] = "0x48254"
+ did["8086/0a26","r"] = "0xc8254"; did["8086/0a26","w"] = "0x48254"
+ # broadwell
+ did["8086/1616","r"] = "0xc8254"; did["8086/1616","w"] = "0xc8254"
+ # skylake
+ did["8086/1916","r"] = "0xc8254"; did["8086/1916","w"] = "0xc8254"
+ # kaby lake (not working)
+ did["8086/3ea0","r"] = "0xc8254"; did["8086/1916","w"] = "0xc8254"
+ # gemini lake (not working)
+ did["8086/3185","r"] = "0xc8254"; did["8086/3185","w"] = "0xc8254"
+}
+$2 == "vid" && dev == ""{+ split($4, id, "/")
+ if(vid[id[1]] == ""){+ print "unsupported vendor", id[1] >"/fd/2"
+ next
+ }
+ if(did[$4,"r"] == ""){+ print "unsupported device", id[2] ">/fd/2"
+ next
+ }
+ type = vid[id[1]]
+ dev = $4
+ mem = $7
+}
+function igfxpwm(){+ if(system("echo type igfx >/dev/vgactl") != 0){+ print "unsupported device", $4 >"/fd/2"
+ exit "attach failed"
+ }
+ r = pipe("seg -Lr igfxmmio " mem " " did[dev,"r"])+ v = pipe("echo \''" r " & ~0xffff | ((" r ">>16) * " fac " / 100)\'' | pc -n")+ if(system("seg -Lw igfxmmio " mem " " did[dev,"w"] " " v) != 0)+ exit "write failed"
+}
+END{+ if(dev == ""){+ print "no known devices" >"/fd/2"
+ exit "no known devices"
+ }
+ if(type == "igfx")
+ igfxpwm()
+ else{+ print "no known devices" >"/fd/2"
+ exit "no known devices"
+ }
+}
+'