hello,
because I could not change the excessive lcd brightness of my laptop
under openbsd I started searching for... this article
http://www.linux.it/~malattia/wiki/index.php/Sony-laptop
was the inspiration and I wrote this humble basic driver.
here it works well and I think it should also work for others
vaio laptops (or at least for vaios that have SBRT/GBRT acpi methods.
...
acpidock at acpi0 not configured
acpisnc0 at acpi0: SNC_
...
usage:
sysctl -w hw.brightness=0..8
giovanni
diff -ruN sys.orig/arch/i386/conf/GENERIC sys/arch/i386/conf/GENERIC
--- sys.orig/arch/i386/conf/GENERIC Fri Apr 27 11:03:35 2007
+++ sys/arch/i386/conf/GENERIC Sat Apr 28 09:22:37 2007
@@ -59,7 +59,7 @@
pci* at mainbus0
#option ACPIVERBOSE
-#option ACPI_ENABLE
+option ACPI_ENABLE
acpi0 at mainbus? disable
#acpitimer* at acpi?
@@ -72,6 +72,7 @@
acpiec* at acpi? disable
acpiprt* at acpi?
#acpitz* at acpi?
+acpisnc* at acpi? # sony notebook controller
option PCIVERBOSE
option EISAVERBOSE
diff -ruN sys.orig/dev/acpi/acpi.c sys/dev/acpi/acpi.c
--- sys.orig/dev/acpi/acpi.c Fri Apr 27 10:46:22 2007
+++ sys/dev/acpi/acpi.c Sat Apr 28 08:57:53 2007
@@ -65,6 +65,7 @@
void acpi_foundec(struct aml_node *, void *);
void acpi_foundtmp(struct aml_node *, void *);
void acpi_inidev(struct aml_node *, void *);
+void acpi_foundsnc(struct aml_node *, void *);
int acpi_loadtables(struct acpi_softc *, struct acpi_rsdp *);
void acpi_load_table(paddr_t, size_t, acpi_qhead_t *);
@@ -573,6 +574,9 @@
/* attach docks */
aml_find_node(aml_root.child, "_DCK", acpi_founddock, sc);
+ /* attach sony notebook control */
+ aml_find_node(aml_root.child, "GBRT", acpi_foundsnc, sc);
+
/* create list of devices we want to query when APM come in */
SLIST_INIT(&sc->sc_ac);
SLIST_INIT(&sc->sc_bat);
@@ -1718,4 +1722,24 @@
config_found(self, &aaa, acpi_print);
}
+
+void
+acpi_foundsnc(struct aml_node *node, void *arg)
+{
+ struct acpi_softc *sc = (struct acpi_softc *)arg;
+ struct device *self = (struct device *)arg;
+ const char *dev;
+ struct acpi_attach_args aaa;
+
+ dnprintf(10, "found snc entry: %s\n", node->parent->name);
+ memset(&aaa, 0, sizeof(aaa));
+ aaa.aaa_iot = sc->sc_iot;
+ aaa.aaa_memt = sc->sc_memt;
+ aaa.aaa_node = node->parent;
+ aaa.aaa_dev = dev;
+ aaa.aaa_name = "acpisnc";
+
+ config_found(self, &aaa, acpi_print);
+}
+
#endif /* SMALL_KERNEL */
diff -ruN sys.orig/dev/acpi/acpidev.h sys/dev/acpi/acpidev.h
--- sys.orig/dev/acpi/acpidev.h Fri Apr 27 10:46:22 2007
+++ sys/dev/acpi/acpidev.h Sat Apr 28 07:33:48 2007
@@ -311,5 +311,14 @@
#define ACPIDOCK_EVENT_INSERT 0
#define ACPIDOCK_EVENT_EJECT 3
+struct acpisnc_softc {
+ struct device sc_dev;
+
+ bus_space_tag_t sc_iot;
+ bus_space_handle_t sc_ioh;
+
+ struct acpi_softc *sc_acpi;
+ struct aml_node *sc_devnode;
+};
#endif /* __DEV_ACPI_ACPIDEV_H__ */
diff -ruN sys.orig/dev/acpi/acpisnc.c sys/dev/acpi/acpisnc.c
--- sys.orig/dev/acpi/acpisnc.c Thu Jan 1 01:00:00 1970
+++ sys/dev/acpi/acpisnc.c Sat Apr 28 15:14:59 2007
@@ -0,0 +1,89 @@
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/device.h>
+#include <sys/malloc.h>
+#include <sys/sysctl.h>
+
+#include <machine/bus.h>
+
+#include <dev/acpi/acpireg.h>
+#include <dev/acpi/acpivar.h>
+#include <dev/acpi/acpidev.h>
+#include <dev/acpi/amltypes.h>
+#include <dev/acpi/dsdt.h>
+
+extern int brtlevel;
+
+int acpisnc_match(struct device *, void *, void *);
+void acpisnc_attach(struct device *, struct device *, void *);
+void brightness(int*);
+
+static struct acpisnc_softc *sc;
+
+struct cfattach acpisnc_ca = {
+ sizeof(struct acpisnc_softc), acpisnc_match, acpisnc_attach
+};
+
+struct cfdriver acpisnc_cd = {
+ NULL, "acpisnc", DV_DULL
+};
+
+int
+acpisnc_match(struct device *parent, void *match, void *aux)
+{
+ struct acpi_attach_args *aaa = aux;
+ struct cfdata *cf = match;
+
+ /* sanity */
+ if (aaa->aaa_name == NULL ||
+ strcmp(aaa->aaa_name, cf->cf_driver->cd_name) != 0 ||
+ aaa->aaa_table != NULL)
+ return (0);
+
+ return (1);
+}
+
+void
+acpisnc_attach(struct device *parent, struct device *self, void *aux)
+{
+ sc = (struct acpisnc_softc *)self;
+ struct acpi_attach_args *aa = aux;
+ struct aml_value res;
+
+ sc->sc_acpi = (struct acpi_softc *)parent;
+ sc->sc_devnode = aa->aaa_node->child;
+
+ printf(": %s\n", sc->sc_devnode->parent->name);
+
+ /* read GBRT i.e default stored brighteness level */
+ if (aml_evalname(sc->sc_acpi, sc->sc_devnode, "GBRT", 0, NULL,
&res)) {
+ dnprintf(10, "%s: error reading current brightness", DEVNAME(sc));
+ goto err;
+ }
+
+ brtlevel = aml_val2int(&res);
+ brt_set = brightness;
+
+err:
+ aml_freevalue(&res);
+}
+
+void
+brightness(int *val) {
+
+ struct aml_value res;
+
+ if (*val > 8)
+ *val = 8;
+ if (*val < 0)
+ *val = 0;
+
+ memset(&res, 0, sizeof(res));
+ res.type = AML_OBJTYPE_INTEGER;
+ res.v_integer = *val;
+
+ if (aml_evalname(sc->sc_acpi, sc->sc_devnode, "SBRT", 1, &res, NULL))
+ printf("error settings current brightness to %d\n", *val);
+
+ aml_freevalue(&res);
+}
diff -ruN sys.orig/dev/acpi/files.acpi sys/dev/acpi/files.acpi
--- sys.orig/dev/acpi/files.acpi Fri Apr 27 10:46:22 2007
+++ sys/dev/acpi/files.acpi Sat Apr 28 07:35:45 2007
@@ -66,3 +66,8 @@
attach acpidock at acpi
file dev/acpi/acpidock.c acpidock
+# sony notebook controller
+device acpisnc
+attach acpisnc at acpi
+file dev/acpi/acpisnc.c acpisnc
+
diff -ruN sys.orig/kern/kern_sysctl.c sys/kern/kern_sysctl.c
--- sys.orig/kern/kern_sysctl.c Fri Apr 27 10:46:55 2007
+++ sys/kern/kern_sysctl.c Sat Apr 28 07:48:53 2007
@@ -107,6 +107,9 @@
void (*cpu_setperf)(int);
int perflevel = 100;
+int brtlevel = 1;
+void (*brt_set)(int*);
+
/*
* Lock to avoid too many processes vslocking a large amount of memory
* at the same time.
@@ -605,6 +608,15 @@
if (err)
return err;
return (sysctl_rdint(oldp, oldlenp, newp, cpuspeed));
+ case HW_SETBRT:
+ if (!brt_set)
+ return (EOPNOTSUPP);
+ err = sysctl_int(oldp, oldlenp, newp, newlen, &brtlevel);
+ if (err)
+ return err;
+ if (newp)
+ brt_set(&brtlevel);
+ return (0);
case HW_SETPERF:
if (!cpu_setperf)
return (EOPNOTSUPP);
diff -ruN sys.orig/sys/sysctl.h sys/sys/sysctl.h
--- sys.orig/sys/sysctl.h Fri Apr 27 10:47:11 2007
+++ sys/sys/sysctl.h Sat Apr 28 07:50:36 2007
@@ -552,7 +552,8 @@
#define HW_VERSION 16 /* string: hardware version */
#define HW_SERIALNO 17 /* string: hardware serial number */
#define HW_UUID 18 /* string: universal unique id */
-#define HW_MAXID 19 /* number of valid hw ids */
+#define HW_SETBRT 19 /* set LCD brightness */
+#define HW_MAXID 20 /* number of valid hw ids */
#define CTL_HW_NAMES { \
{ 0, 0 }, \
@@ -574,6 +575,7 @@
{ "version", CTLTYPE_STRING }, \
{ "serialno", CTLTYPE_STRING }, \
{ "uuid", CTLTYPE_STRING }, \
+ { "brightness", CTLTYPE_INT }, \
}
/*
@@ -724,6 +726,7 @@
extern int (*cpu_cpuspeed)(int *);
extern void (*cpu_setperf)(int);
+extern void (*brt_set)(int*);
int bpf_sysctl(int *, u_int, void *, size_t *, void *, size_t);
