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liblights: Scale brightness if necessary

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Change-Id: Ia9fdbe0c0f709e8e2e16f9cd2fb757c6f53e7c50
This commit is contained in:
Christopher N. Hesse 2016-12-05 22:11:55 +01:00
parent ae27148492
commit f3c6a42a21
2 changed files with 62 additions and 0 deletions
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1
liblights/include/samsung_lights.h
View file

@ -25,6 +25,7 @@
* device tree.
*/
#define PANEL_BRIGHTNESS_NODE "/sys/class/backlight/panel/brightness"
#define PANEL_MAX_BRIGHTNESS_NODE "/sys/class/backlight/panel/max_brightness"
#define BUTTON_BRIGHTNESS_NODE "/sys/class/sec/sec_touchkey/brightness"
#define LED_BLINK_NODE "/sys/class/sec/led/led_blink"

61
liblights/lights.c
View file

@ -35,14 +35,21 @@
#define COLOR_MASK 0x00ffffff
#define MAX_INPUT_BRIGHTNESS 255
static pthread_once_t g_init = PTHREAD_ONCE_INIT;
static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
struct backlight_config {
int cur_brightness, max_brightness;
};
struct led_config {
unsigned int color;
int delay_on, delay_off;
};
static struct backlight_config g_backlight; // For panel backlight
static struct led_config g_leds[3]; // For battery, notifications, and attention.
static int g_cur_led = -1; // Presently showing LED of the above.
@ -51,6 +58,38 @@ void init_g_lock(void)
pthread_mutex_init(&g_lock, NULL);
}
static int read_int(char const *path)
{
int fd, len;
int num_bytes = 10;
char buf[11];
int retval;
fd = open(path, O_RDONLY);
if (fd < 0) {
ALOGE("%s: failed to open %s\n", __func__, path);
goto fail;
}
len = read(fd, buf, num_bytes - 1);
if (len < 0) {
ALOGE("%s: failed to read from %s\n", __func__, path);
goto fail;
}
buf[len] = '\0';
close(fd);
// no endptr, decimal base
retval = strtol(buf, NULL, 10);
return retval == 0 ? -1 : retval;
fail:
if (fd >= 0)
close(fd);
return -1;
}
static int write_int(char const *path, int value)
{
int fd;
@ -112,9 +151,23 @@ static int set_light_backlight(struct light_device_t *dev __unused,
{
int err = 0;
int brightness = rgb_to_brightness(state);
int max_brightness = g_backlight.max_brightness;
/*
* If our max panel brightness is > 255, apply linear scaling across the
* accepted range.
*/
if (max_brightness > MAX_INPUT_BRIGHTNESS) {
int old_brightness = brightness;
brightness = brightness * max_brightness / MAX_INPUT_BRIGHTNESS;
ALOGV("%s: scaling brightness %d => %d\n", __func__,
old_brightness, brightness);
}
pthread_mutex_lock(&g_lock);
err = write_int(PANEL_BRIGHTNESS_NODE, brightness);
if (err == 0)
g_backlight.cur_brightness = brightness;
pthread_mutex_unlock(&g_lock);
return err;
@ -306,6 +359,14 @@ static int open_lights(const struct hw_module_t *module, char const *name,
else
return -EINVAL;
int max_brightness = read_int(PANEL_MAX_BRIGHTNESS_NODE);
if (max_brightness < 0) {
ALOGE("%s: failed to read max panel brightness, fallback to 255!",
__func__);
max_brightness = 255;
}
g_backlight.max_brightness = max_brightness;
pthread_once(&g_init, init_g_lock);
struct light_device_t *dev = malloc(sizeof(struct light_device_t));