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sna: First scan for a backlight associated with the device 

The goal is to find the right interface in a multi-GPU system.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2012-09-07 18:06:25 +01:00
parent 2de7d2d815
commit 7d76eb155e
1 changed files with 108 additions and 17 deletions
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125
src/sna/sna_display.c
View File

@ -318,8 +318,84 @@ has_user_backlight_override(xf86OutputPtr output)
return str;
}
static void
sna_output_backlight_init(xf86OutputPtr output)
static char *
has_device_backlight(xf86OutputPtr output, int *best_type)
{
struct sna_output *sna_output = output->driver_private;
struct sna *sna = to_sna(output->scrn);
struct pci_device *pci = sna->PciInfo;
char path[1024];
char *best_iface = NULL;
DIR *dir;
struct dirent *de;
snprintf(path, sizeof(path),
"/sys/bus/pci/devices/%04x:%02x:%02x.%d/backlight",
pci->domain, pci->bus, pci->dev, pci->func);
DBG(("%s: scanning %s\n", __FUNCTION__, path));
dir = opendir(path);
if (dir == NULL)
return NULL;
while ((de = readdir(dir))) {
char buf[100];
int fd, v;
if (*de->d_name == '.')
continue;
DBG(("%s: %s\n", __FUNCTION__, de->d_name));
snprintf(path, sizeof(path), "%s/%s/type",
BACKLIGHT_CLASS, de->d_name);
v = -1;
fd = open(path, O_RDONLY);
if (fd >= 0) {
v = read(fd, buf, sizeof(buf)-1);
close(fd);
}
if (v > 0) {
while (v > 0 && isspace(buf[v-1]))
v--;
buf[v] = '\0';
if (strcmp(buf, "raw") == 0)
v = RAW;
else if (strcmp(buf, "platform") == 0)
v = PLATFORM;
else if (strcmp(buf, "firmware") == 0)
v = FIRMWARE;
else
v = INT_MAX;
} else
v = INT_MAX;
if (v < *best_type) {
char *copy;
int max;
sna_output->backlight_iface = de->d_name;
max = sna_output_backlight_get_max(output);
sna_output->backlight_iface = NULL;
if (max <= 0)
continue;
copy = strdup(de->d_name);
if (copy) {
free(best_iface);
best_iface = copy;
*best_type = v;
}
}
}
closedir(dir);
return best_iface;
}
static char *
has_backlight(xf86OutputPtr output, int *best_type)
{
static const char *known_interfaces[] = {
"gmux_backlight",
@ -335,21 +411,14 @@ sna_output_backlight_init(xf86OutputPtr output)
"acpi_video0",
"intel_backlight",
};
MessageType from = X_PROBED;
struct sna_output *sna_output = output->driver_private;
char *best_iface;
int best_type;
char *best_iface = NULL;
DIR *dir;
struct dirent *de;
best_type = INT_MAX;
best_iface = has_user_backlight_override(output);
if (best_iface)
goto skip;
dir = opendir(BACKLIGHT_CLASS);
if (dir == NULL)
return;
return NULL;
while ((de = readdir(dir))) {
char path[1024];
@ -394,7 +463,7 @@ sna_output_backlight_init(xf86OutputPtr output)
v += i;
}
if (v < best_type) {
if (v < *best_type) {
char *copy;
int max;
@ -410,16 +479,39 @@ sna_output_backlight_init(xf86OutputPtr output)
if (copy) {
free(best_iface);
best_iface = copy;
best_type = v;
*best_type = v;
}
}
}
closedir(dir);
if (!best_iface)
return;
return best_iface;
}
skip:
static void
sna_output_backlight_init(xf86OutputPtr output)
{
struct sna_output *sna_output = output->driver_private;
MessageType from = X_PROBED;
char *best_iface;
int best_type;
best_type = INT_MAX;
best_iface = has_user_backlight_override(output);
if (best_iface)
goto done;
best_iface = has_device_backlight(output, &best_type);
if (best_iface)
goto done;
best_iface = has_backlight(output, &best_type);
if (best_iface)
goto done;
return;
done:
sna_output->backlight_iface = best_iface;
sna_output->backlight_max = sna_output_backlight_get_max(output);
sna_output->backlight_active_level = sna_output_backlight_get(output);
@ -435,7 +527,6 @@ skip:
sna_output->backlight_iface, best_iface);
}
static void
mode_from_kmode(ScrnInfoPtr scrn,
drmModeModeInfoPtr kmode,