| Revision | 1b56f57da510b43bd2c9c9f77e88e793b672186b (tree) |
|---|---|
| Time | 2013-02-28 02:06:49 |
| Author | Chih-Wei Huang <cwhuang@linu...> |
| Commiter | Chih-Wei Huang |
search brightness under /sys/class/backlight automatically
| @@ -18,6 +18,8 @@ | ||
| 18 | 18 | |
| 19 | 19 | #include <cutils/log.h> |
| 20 | 20 | |
| 21 | +#include <sys/types.h> | |
| 22 | +#include <dirent.h> | |
| 21 | 23 | #include <stdint.h> |
| 22 | 24 | #include <string.h> |
| 23 | 25 | #include <unistd.h> |
| @@ -39,9 +41,6 @@ char const*const LLP_BRIGHTNESS_FILE = "backlight.brightness_file"; | ||
| 39 | 41 | char const*const LLP_MAX_BRIGHTNESS_FILE = "backlight.max_brightness_file"; |
| 40 | 42 | char const*const LLP_MAX_BRIGHTNESS = "backlight.max_brightness"; |
| 41 | 43 | |
| 42 | -char const*const DEF_LLP_BRIGHTNESS_FILE = "/sys/class/backlight/acpi_video0/brightness"; | |
| 43 | -char const*const DEF_LLP_MAX_BRIGHTNESS_FILE = "/sys/class/backlight/acpi_video0/max_brightness"; | |
| 44 | - | |
| 45 | 44 | void init_globals(void) |
| 46 | 45 | { |
| 47 | 46 | pthread_mutex_init(&g_lock, NULL); |
| @@ -110,6 +109,44 @@ static int close_lights(struct light_device_t *dev) | ||
| 110 | 109 | return 0; |
| 111 | 110 | } |
| 112 | 111 | |
| 112 | +static int check_backlight_file(char const* name, char* path) | |
| 113 | +{ | |
| 114 | + int ret; | |
| 115 | + if (access(name, F_OK)) { | |
| 116 | + ret = 0; | |
| 117 | + } else { | |
| 118 | + ALOGD("Detect %s", name); | |
| 119 | + strcpy(path, name); | |
| 120 | + ret = 1; // found | |
| 121 | + } | |
| 122 | + return ret; | |
| 123 | +} | |
| 124 | + | |
| 125 | +static int find_backlight_file(char const* file, char* path) | |
| 126 | +{ | |
| 127 | + int ret; | |
| 128 | + char name[PATH_MAX]; | |
| 129 | + const char* dirname = "/sys/class/backlight"; | |
| 130 | + | |
| 131 | + // Check acpi_video0 first. It seems to work in most cases. | |
| 132 | + snprintf(name, PATH_MAX, "%s/acpi_video0/%s", dirname, file); | |
| 133 | + if (!(ret = check_backlight_file(name, path))) { | |
| 134 | + DIR* dir = opendir(dirname); | |
| 135 | + if (dir != NULL) { | |
| 136 | + struct dirent* de; | |
| 137 | + while ((de = readdir(dir))) { | |
| 138 | + if (de->d_name[0] != '.') { | |
| 139 | + snprintf(name, PATH_MAX, "%s/%s/%s", dirname, de->d_name, file); | |
| 140 | + if ((ret = check_backlight_file(name, path))) { | |
| 141 | + break; | |
| 142 | + } | |
| 143 | + } | |
| 144 | + } | |
| 145 | + closedir(dir); | |
| 146 | + } | |
| 147 | + } | |
| 148 | + return ret; | |
| 149 | +} | |
| 113 | 150 | |
| 114 | 151 | static int open_lights(const struct hw_module_t* module, char const* name, struct hw_device_t** device) |
| 115 | 152 | { |
| @@ -125,10 +162,11 @@ static int open_lights(const struct hw_module_t* module, char const* name, struc | ||
| 125 | 162 | return -EINVAL; |
| 126 | 163 | } |
| 127 | 164 | } else { |
| 128 | - if (property_get(LLP_MAX_BRIGHTNESS_FILE, max_b_file, DEF_LLP_MAX_BRIGHTNESS_FILE)) { | |
| 165 | + if (property_get(LLP_MAX_BRIGHTNESS_FILE, max_b_file, NULL) || | |
| 166 | + find_backlight_file("max_brightness", max_b_file)) { | |
| 129 | 167 | max_brightness = read_int(max_b_file); |
| 130 | 168 | } else { |
| 131 | - ALOGE("%s system property not set", LLP_MAX_BRIGHTNESS_FILE); | |
| 169 | + ALOGE("Unable to detect max_brightness. Try to set %s", LLP_MAX_BRIGHTNESS_FILE); | |
| 132 | 170 | return -EINVAL; |
| 133 | 171 | } |
| 134 | 172 | } |
| @@ -136,7 +174,8 @@ static int open_lights(const struct hw_module_t* module, char const* name, struc | ||
| 136 | 174 | if (max_brightness < 1) { |
| 137 | 175 | max_brightness = 255; |
| 138 | 176 | } |
| 139 | - if (!property_get(LLP_BRIGHTNESS_FILE, brightness_file, DEF_LLP_BRIGHTNESS_FILE)) { | |
| 177 | + if (!property_get(LLP_BRIGHTNESS_FILE, brightness_file, NULL) && | |
| 178 | + !find_backlight_file("brightness", brightness_file)) { | |
| 140 | 179 | ALOGE("%s system property not set", LLP_BRIGHTNESS_FILE); |
| 141 | 180 | return -EINVAL; |
| 142 | 181 | } |
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