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liblights: Check for hardware support on HAL open

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Change-Id: I601a987914e1774c9d1d12574f143f19f22b12e9
This commit is contained in:
Christopher N. Hesse 2016-12-31 17:14:47 +01:00
parent 34b8ed06f2
commit a8fe2a112f
1 changed files with 38 additions and 6 deletions
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44
liblights/lights.c
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@ -38,6 +38,15 @@
#define MAX_INPUT_BRIGHTNESS 255
enum component_mask_t {
COMPONENT_BACKLIGHT = 0x1,
COMPONENT_BUTTON_LIGHT = 0x2,
COMPONENT_LED = 0x4,
};
// Assume backlight is always supported
static int hw_components = COMPONENT_BACKLIGHT;
static pthread_once_t g_init = PTHREAD_ONCE_INIT;
static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
@ -54,6 +63,14 @@ 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.
void check_component_support()
{
if (access(BUTTON_BRIGHTNESS_NODE, W_OK) == 0)
hw_components |= COMPONENT_BUTTON_LIGHT;
if (access(LED_BLINK_NODE, W_OK) == 0)
hw_components |= COMPONENT_LED;
}
void init_g_lock(void)
{
pthread_mutex_init(&g_lock, NULL);
@ -287,21 +304,36 @@ static int set_light_leds_attention(struct light_device_t *dev __unused,
static int open_lights(const struct hw_module_t *module, char const *name,
struct hw_device_t **device)
{
int requested_component;
int (*set_light)(struct light_device_t *dev,
struct light_state_t const *state);
if (0 == strcmp(LIGHT_ID_BACKLIGHT, name))
check_component_support();
if (0 == strcmp(LIGHT_ID_BACKLIGHT, name)) {
requested_component = COMPONENT_BACKLIGHT;
set_light = set_light_backlight;
else if (0 == strcmp(LIGHT_ID_BUTTONS, name))
} else if (0 == strcmp(LIGHT_ID_BUTTONS, name)) {
requested_component = COMPONENT_BUTTON_LIGHT;
set_light = set_light_buttons;
else if (0 == strcmp(LIGHT_ID_BATTERY, name))
} else if (0 == strcmp(LIGHT_ID_BATTERY, name)) {
requested_component = COMPONENT_LED;
set_light = set_light_leds_battery;
else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name))
} else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name)) {
requested_component = COMPONENT_LED;
set_light = set_light_leds_notifications;
else if (0 == strcmp(LIGHT_ID_ATTENTION, name))
} else if (0 == strcmp(LIGHT_ID_ATTENTION, name)) {
requested_component = COMPONENT_LED;
set_light = set_light_leds_attention;
else
} else {
return -EINVAL;
}
if ((hw_components & requested_component) == 0) {
ALOGV("%s: component 0x%x not supported by device", __func__,
requested_component);
return -EINVAL;
}
int max_brightness = get_max_panel_brightness();
if (max_brightness < 0) {