s5pc110: Add Power HAL (userspace CPU boosting)

The majority of this commit is by Steve Kondik for the D2, modified
by Daniel Bateman and me.

Change-Id: Id6c1a1f0c6b39d5d20a765545526c07ad0fc64f6

exynos3/s5pc110/Android.mk

@@ -17,7 +17,7 @@
 ifeq ($(TARGET_BOARD_PLATFORM),s5pc110)
 
 # audio, camera, sensor and light HALs are device specifc
-s5pc110_dirs := libhwcomposer libs3cjpeg libstagefrighthw sec_mm
+s5pc110_dirs := libhwcomposer libs3cjpeg libstagefrighthw sec_mm power
 
 include $(call all-named-subdir-makefiles,$(s5pc110_dirs))
 

exynos3/s5pc110/power/Android.mk

@@ -0,0 +1,27 @@
+# Copyright (C) 2012 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+LOCAL_PATH := $(call my-dir)
+
+# HAL module implemenation stored in
+# hw/<POWERS_HARDWARE_MODULE_ID>.<ro.hardware>.so
+include $(CLEAR_VARS)
+
+LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw
+LOCAL_SHARED_LIBRARIES := liblog libcutils
+LOCAL_SRC_FILES := power.c
+LOCAL_MODULE := power.$(TARGET_BOARD_PLATFORM)
+LOCAL_MODULE_TAGS := optional
+include $(BUILD_SHARED_LIBRARY)

exynos3/s5pc110/power/power.c

@@ -0,0 +1,158 @@
+/*
+ * Copyright (C) 2012 The Android Open Source Project
+ * Copyright (C) 2012 The CyanogenMod Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include <errno.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#define LOG_TAG "PowerHAL"
+#include <cutils/properties.h>
+#include <utils/Log.h>
+
+#include <hardware/hardware.h>
+#include <hardware/power.h>
+
+#define BOOSTPULSE_PATH "/sys/devices/system/cpu/cpufreq/ondemand/boostpulse"
+#define SAMPLING_RATE_ONDEMAND "/sys/devices/system/cpu/cpufreq/ondemand/sampling_rate"
+#define SAMPLING_RATE_SCREEN_ON "40000"
+#define SAMPLING_RATE_SCREEN_OFF "400000"
+
+struct s5pc110_power_module {
+    struct power_module base;
+    pthread_mutex_t lock;
+    int boostpulse_fd;
+    int boostpulse_warned;
+    char sampling_rate_screen_on[PROPERTY_VALUE_MAX];
+    char sampling_rate_screen_off[PROPERTY_VALUE_MAX];
+};
+
+static void sysfs_write(char *path, char *s)
+{
+    char buf[80];
+    int len;
+    int fd = open(path, O_WRONLY);
+
+    if (fd < 0) {
+        strerror_r(errno, buf, sizeof(buf));
+        ALOGE("Error opening %s: %s\n", path, buf);
+        return;
+    }
+
+    len = write(fd, s, strlen(s));
+    if (len < 0) {
+        strerror_r(errno, buf, sizeof(buf));
+        ALOGE("Error writing to %s: %s\n", path, buf);
+    }
+
+    close(fd);
+}
+
+static int boostpulse_open(struct s5pc110_power_module *s5pc110)
+{
+    char buf[80];
+
+    pthread_mutex_lock(&s5pc110->lock);
+
+    if (s5pc110->boostpulse_fd < 0) {
+        s5pc110->boostpulse_fd = open(BOOSTPULSE_PATH, O_WRONLY);
+
+        if (s5pc110->boostpulse_fd < 0) {
+            if (!s5pc110->boostpulse_warned) {
+                strerror_r(errno, buf, sizeof(buf));
+                ALOGE("Error opening %s: %s\n", BOOSTPULSE_PATH, buf);
+                s5pc110->boostpulse_warned = 1;
+            }
+        }
+    }
+
+    pthread_mutex_unlock(&s5pc110->lock);
+    return s5pc110->boostpulse_fd;
+}
+
+static void s5pc110_power_hint(struct power_module *module, power_hint_t hint,
+                            void *data)
+{
+    struct s5pc110_power_module *s5pc110 = (struct s5pc110_power_module *) module;
+    char buf[80];
+    int len;
+    int duration = 1;
+
+    switch (hint) {
+    case POWER_HINT_INTERACTION:
+    case POWER_HINT_CPU_BOOST:
+        if (boostpulse_open(s5pc110) >= 0) {
+            if (data != NULL)
+                duration = (int) data;
+
+            snprintf(buf, sizeof(buf), "%d", duration);
+            len = write(s5pc110->boostpulse_fd, buf, strlen(buf));
+
+            if (len < 0) {
+                strerror_r(errno, buf, sizeof(buf));
+                ALOGE("Error writing to %s: %s\n", BOOSTPULSE_PATH, buf);
+            }
+        }
+        break;
+
+    case POWER_HINT_VSYNC:
+        break;
+
+    default:
+        break;
+    }
+}
+
+static void s5pc110_power_set_interactive(struct power_module *module, int on)
+{
+    struct s5pc110_power_module *s5pc110 = (struct s5pc110_power_module *) module;
+    sysfs_write(SAMPLING_RATE_ONDEMAND,
+            on ? s5pc110->sampling_rate_screen_on : s5pc110->sampling_rate_screen_off);
+}
+
+static void s5pc110_power_init(struct power_module *module)
+{
+    struct s5pc110_power_module *s5pc110 = (struct s5pc110_power_module *) module;
+    property_get("ro.sys.sampling_rate_on", s5pc110->sampling_rate_screen_on, SAMPLING_RATE_SCREEN_ON);
+    property_get("ro.sys.sampling_rate_off", s5pc110->sampling_rate_screen_off, SAMPLING_RATE_SCREEN_OFF);
+    sysfs_write(SAMPLING_RATE_ONDEMAND, s5pc110->sampling_rate_screen_on);
+}
+
+static struct hw_module_methods_t power_module_methods = {
+    .open = NULL,
+};
+
+struct s5pc110_power_module HAL_MODULE_INFO_SYM = {
+    base: {
+        common: {
+            tag: HARDWARE_MODULE_TAG,
+            module_api_version: POWER_MODULE_API_VERSION_0_2,
+            hal_api_version: HARDWARE_HAL_API_VERSION,
+            id: POWER_HARDWARE_MODULE_ID,
+            name: "S5PC110 Power HAL",
+            author: "The Android Open Source Project",
+            methods: &power_module_methods,
+        },
+       init: s5pc110_power_init,
+       setInteractive: s5pc110_power_set_interactive,
+       powerHint: s5pc110_power_hint,
+    },
+
+    lock: PTHREAD_MUTEX_INITIALIZER,
+    boostpulse_fd: -1,
+    boostpulse_warned: 0,
+};