Date: Wed, 21 Sep 2011 22:47:47 -0400 From: Justin Hibbits <jrh29@alumni.cwru.edu> To: FreeBSD PowerPC ML <freebsd-ppc@freebsd.org> Subject: ofw syscons brightness patch Message-ID: <91CC14C1-14F2-41B3-81F1-D90B42F038CA@alumni.cwru.edu>
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Hey guys,
Attached is a patch that adds brightness control to ofw syscons
(dev.sc.0.brightness sysctl). Pretty simple. Comments and tests
requested. Hopefully the listserv doesn't eat the patch.
Thanks,
Justin
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Index: sys/powerpc/ofw/ofw_syscons.c
===================================================================
--- sys/powerpc/ofw/ofw_syscons.c (revision 225715)
+++ sys/powerpc/ofw/ofw_syscons.c (working copy)
@@ -98,7 +98,11 @@
static vi_putc_t ofwfb_putc;
static vi_puts_t ofwfb_puts;
static vi_putm_t ofwfb_putm;
+static int brightness;
+static void ofwfb_set_brightness(int);
+static int ofwfb_set_brightness_sc(SYSCTL_HANDLER_ARGS);
+
static video_switch_t ofwfbvidsw = {
.probe = ofwfb_probe,
.init = ofwfb_init,
@@ -185,6 +189,7 @@
static u_int16_t ofwfb_static_window[ROW*COL];
static struct ofwfb_softc ofwfb_softc;
+static ihandle_t stdout_ih;
static __inline int
ofwfb_background(uint8_t attr)
@@ -399,7 +404,6 @@
{
struct ofwfb_softc *sc;
char name[64];
- ihandle_t ih;
int i, retval;
sc = (struct ofwfb_softc *)adp;
@@ -410,7 +414,7 @@
memset(name, 0, sizeof(name));
OF_package_to_path(sc->sc_node, name, sizeof(name));
- ih = OF_open(name);
+ stdout_ih = OF_open(name);
if (sc->sc_depth == 8) {
/*
@@ -418,7 +422,7 @@
* don't do this by default
*/
for (i = 0; i < 16; i++) {
- OF_call_method("color!", ih, 4, 1,
+ OF_call_method("color!", stdout_ih, 4, 1,
ofwfb_cmap[i].red,
ofwfb_cmap[i].green,
ofwfb_cmap[i].blue,
@@ -965,10 +969,49 @@
static int
ofwfb_scattach(device_t dev)
{
+ struct sysctl_ctx_list *ctx;
+ struct sysctl_oid *tree;
+
+ ctx = device_get_sysctl_ctx(dev);
+ tree = device_get_sysctl_tree(dev);
+
+ SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
+ "brightness", CTLTYPE_INT | CTLFLAG_RW, NULL, 0,
+ ofwfb_set_brightness_sc, "I", "Adjust the brightness of the screen");
+
+ ofwfb_set_brightness(DEFAULT_BRIGHTNESS);
+
return (sc_attach_unit(device_get_unit(dev),
device_get_flags(dev) | SC_AUTODETECT_KBD));
}
+static void ofwfb_set_brightness(int newbright)
+{
+ /* If the backlight is off already, turn it on. */
+ if (newbright < MIN_BRIGHTNESS)
+ if (brightness == 0)
+ newbright = MIN_BRIGHTNESS;
+ else
+ newbright = 0;
+ else if (newbright > MAX_BRIGHTNESS)
+ newbright = MAX_BRIGHTNESS;
+ OF_call_method("set-contrast", stdout_ih, 1, 0, newbright);
+ brightness = newbright;
+}
+
+static int ofwfb_set_brightness_sc(SYSCTL_HANDLER_ARGS)
+{
+ int newbright = brightness;
+ int error;
+
+ error = sysctl_handle_int(oidp, &newbright, 0, req);
+
+ if (error || !req->newptr)
+ return error;
+ ofwfb_set_brightness(newbright);
+ return (0);
+}
+
static device_method_t ofwfb_sc_methods[] = {
DEVMETHOD(device_identify, ofwfb_scidentify),
DEVMETHOD(device_probe, ofwfb_scprobe),
Index: sys/powerpc/ofw/ofw_syscons.h
===================================================================
--- sys/powerpc/ofw/ofw_syscons.h (revision 225715)
+++ sys/powerpc/ofw/ofw_syscons.h (working copy)
@@ -29,6 +29,11 @@
#ifndef _OFW_SYSCONS_H_
#define _OFW_SYSCONS_H_
+#define MIN_BRIGHTNESS 0x34
+#define MAX_BRIGHTNESS 0xFF
+#define DEFAULT_BRIGHTNESS 0x80
+#define STEP_BRIGHTNESS 0x08
+
struct ofwfb_softc {
video_adapter_t sc_va;
struct cdev *sc_si;
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