tuna: Power HAL: Add VSYNC power hint -- DO NOT MERGE

Change-Id: I3a0c72e843c4d9c7a9129a35ed8bbee59acb5599
Signed-off-by: Todd Poynor <toddpoynor@google.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/power/power_tuna.c b/power/power_tuna.c
index eb38410..bff028d 100644
--- a/power/power_tuna.c
+++ b/power/power_tuna.c
@@ -34,6 +34,10 @@
 static int sPowerStatefd;
 static const char *pwr_states[] = { "mem", "on" };
 
+#define BOOST_PATH      "/sys/devices/system/cpu/cpufreq/interactive/boost"
+static int boost_fd = -1;
+static int boost_warned;
+
 static void sysfs_write(char *path, char *s)
 {
     char buf[80];
@@ -103,6 +107,37 @@ static void tuna_power_set_interactive(struct power_module *module, int on)
     }
 }
 
+static void tuna_power_hint(struct power_module *module, power_hint_t hint,
+                            void *data)
+{
+    char buf[80];
+    int len;
+
+    switch (hint) {
+    case POWER_HINT_VSYNC:
+        if (boost_fd < 0)
+            boost_fd = open(BOOST_PATH, O_WRONLY);
+
+        if (boost_fd < 0) {
+            if (!boost_warned) {
+                strerror_r(errno, buf, sizeof(buf));
+                ALOGE("Error opening %s: %s\n", BOOST_PATH, buf);
+                boost_warned = 1;
+            }
+            break;
+        }
+
+        len = write(boost_fd, (int) data ? "1" : "0", 1);
+        if (len < 0) {
+            strerror_r(errno, buf, sizeof(buf));
+            ALOGE("Error writing to %s: %s\n", BOOST_PATH, buf);
+        }
+        break;
+
+    default:
+            break;
+    }
+}
 
 static struct hw_module_methods_t power_module_methods = {
     .open = NULL,
@@ -121,4 +156,5 @@ struct power_module HAL_MODULE_INFO_SYM = {
 
     .init = tuna_power_init,
     .setInteractive = tuna_power_set_interactive,
+    .powerHint = tuna_power_hint,
 };