Add OMAP PowerHAL

Based on the OMAP PowerHAL from omapzoom.org.

Change-Id: Ibc6c6779c9004dc442db436f8b68cbb191b16662

2 files changed, 269 insertions, 0 deletions

diff --git a/libpower/Android.mk b/libpower/Android.mk
new file mode 100644
index 0000000..c6fb0f7
--- /dev/null
+++ b/libpower/Android.mk
@@ -0,0 +1,29 @@
+#
+# Copyright 2016 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)
+
+include $(CLEAR_VARS)
+
+LOCAL_MODULE := power.omap4
+LOCAL_MODULE_PATH := $(TARGET_OUT_SHARED_LIBRARIES)/hw
+LOCAL_SRC_FILES := power.c
+LOCAL_SHARED_LIBRARIES := liblog
+LOCAL_MODULE_TAGS := optional
+
+LOCAL_CFLAGS := -Wall -Werror
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/libpower/power.c b/libpower/power.c
new file mode 100644
index 0000000..bb481e7
--- /dev/null
+++ b/libpower/power.c
@@ -0,0 +1,240 @@
+/*
+ * 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.
+ */
+#include <errno.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#define LOG_TAG "TI OMAP PowerHAL"
+#include <utils/Log.h>
+
+#include <hardware/hardware.h>
+#include <hardware/power.h>
+
+#define CPUFREQ_INTERACTIVE "/sys/devices/system/cpu/cpufreq/interactive/"
+#define CPUFREQ_CPU0 "/sys/devices/system/cpu/cpu0/cpufreq/"
+#define BOOSTPULSE_PATH (CPUFREQ_INTERACTIVE "boostpulse")
+
+#define MAX_FREQ_NUMBER 10
+#define NOM_FREQ_INDEX 2
+
+static int freq_num;
+static char *freq_list[MAX_FREQ_NUMBER];
+static char *max_freq, *nom_freq;
+
+struct omap_power_module {
+    struct power_module base;
+    pthread_mutex_t lock;
+    int boostpulse_fd;
+    int boostpulse_warned;
+    int inited;
+};
+
+static int str_to_tokens(char *str, char **token, int max_token_idx)
+{
+    char *pos, *start_pos = str;
+    char *token_pos;
+    int token_idx = 0;
+
+    if (!str || !token || !max_token_idx)
+        return 0;
+
+    do {
+        token_pos = strtok_r(start_pos, " \t\r\n", &pos);
+
+        if (token_pos)
+            token[token_idx++] = strdup(token_pos);
+        start_pos = NULL;
+    } while (token_pos && token_idx < max_token_idx);
+
+    return token_idx;
+}
+
+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 sysfs_read(char *path, char *s, int s_size)
+{
+    char buf[80];
+    int len;
+    int fd;
+
+    if (!path || !s || !s_size)
+        return -1;
+
+    fd = open(path, O_RDONLY);
+    if (fd < 0) {
+        strerror_r(errno, buf, sizeof(buf));
+        ALOGE("Error opening %s: %s\n", path, buf);
+        return fd;
+    }
+
+    len = read(fd, s, s_size-1);
+    if (len < 0) {
+        strerror_r(errno, buf, sizeof(buf));
+        ALOGE("Error reading from %s: %s\n", path, buf);
+    } else {
+        s[len] = '\0';
+    }
+
+    close(fd);
+    return len;
+}
+
+static void omap_power_init(struct power_module *module)
+{
+    struct omap_power_module *omap_device =
+                                   (struct omap_power_module *) module;
+    int tmp;
+    char freq_buf[MAX_FREQ_NUMBER*10];
+
+    tmp = sysfs_read(CPUFREQ_CPU0 "scaling_available_frequencies",
+                                                   freq_buf, sizeof(freq_buf));
+    if (tmp <= 0)
+        return;
+
+    freq_num = str_to_tokens(freq_buf, freq_list, MAX_FREQ_NUMBER);
+    if (!freq_num)
+        return;
+
+    max_freq = freq_list[freq_num - 1];
+    tmp = (NOM_FREQ_INDEX > freq_num) ? freq_num : NOM_FREQ_INDEX;
+    nom_freq = freq_list[tmp - 1];
+
+    sysfs_write(CPUFREQ_INTERACTIVE "timer_rate", "20000");
+    sysfs_write(CPUFREQ_INTERACTIVE "min_sample_time","60000");
+    sysfs_write(CPUFREQ_INTERACTIVE "hispeed_freq", nom_freq);
+    sysfs_write(CPUFREQ_INTERACTIVE "go_hispeed_load", "50");
+    sysfs_write(CPUFREQ_INTERACTIVE "above_hispeed_delay", "100000");
+
+    ALOGI("Initialized successfully");
+    omap_device->inited = 1;
+}
+
+static int boostpulse_open(struct omap_power_module *omap_device)
+{
+    char buf[80];
+
+    pthread_mutex_lock(&omap_device->lock);
+
+    if (omap_device->boostpulse_fd < 0) {
+        omap_device->boostpulse_fd = open(BOOSTPULSE_PATH, O_WRONLY);
+
+        if (omap_device->boostpulse_fd < 0) {
+            if (!omap_device->boostpulse_warned) {
+                strerror_r(errno, buf, sizeof(buf));
+                ALOGE("Error opening %s: %s\n", BOOSTPULSE_PATH, buf);
+                omap_device->boostpulse_warned = 1;
+            }
+        }
+    }
+
+    pthread_mutex_unlock(&omap_device->lock);
+    return omap_device->boostpulse_fd;
+}
+
+static void omap_power_set_interactive(struct power_module *module,
+                                               int on)
+{
+    struct omap_power_module *omap_device =
+                                   (struct omap_power_module *) module;
+
+    if (!omap_device->inited)
+        return;
+
+    /*
+     * Lower maximum frequency when screen is off.  CPU 0 and 1 share a
+     * cpufreq policy.
+     */
+
+    sysfs_write(CPUFREQ_CPU0 "scaling_max_freq", on ? max_freq : nom_freq);
+}
+
+static void omap_power_hint(struct power_module *module,
+                                    power_hint_t hint, void *data __unused)
+{
+    struct omap_power_module *omap_device =
+            (struct omap_power_module *) module;
+    char buf[80];
+    int len;
+
+    if (!omap_device->inited)
+        return;
+
+    switch (hint) {
+    case POWER_HINT_INTERACTION:
+        if (boostpulse_open(omap_device) >= 0) {
+            len = write(omap_device->boostpulse_fd, "1", 1);
+
+            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 struct hw_module_methods_t power_module_methods = {
+    .open = NULL,
+};
+
+struct omap_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 = "OMAP Power HAL",
+            .author = "The Android Open Source Project",
+            .methods = &power_module_methods,
+        },
+
+       .init = omap_power_init,
+       .setInteractive = omap_power_set_interactive,
+       .powerHint = omap_power_hint,
+    },
+
+    .lock = PTHREAD_MUTEX_INITIALIZER,
+    .boostpulse_fd = -1,
+    .boostpulse_warned = 0,
+};