From 85b5399df1b081000a0982e6e1234523ca9abf9e Mon Sep 17 00:00:00 2001
From: AnilKumar Chimata <anilc@codeaurora.org>
Date: Thu, 18 Dec 2014 00:27:44 +0530
Subject: cryptfs_hw: Add support for is_hw_fde_enabled routine

Add support for is_hw_fde_enabled routine to get the fde
status based on the chipset.

Change-Id: I7e0e078da6668e347a78de487da44ddc331bd478
(cherry picked from commit 144e832ff3e16af20d3975aeec4a64bf8f80a8a3)
---
 Android.mk   |  4 ++++
 cryptfs_hw.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 cryptfs_hw.h |  1 +
 3 files changed, 62 insertions(+)

diff --git a/Android.mk b/Android.mk
index 1d71c2a..8a475a0 100644
--- a/Android.mk
+++ b/Android.mk
@@ -22,6 +22,10 @@ LOCAL_SHARED_LIBRARIES := $(commonSharedLibraries)
 
 LOCAL_MODULE_OWNER := qcom
 
+ifeq ($(TARGET_SWV8_DISK_ENCRYPTION),true)
+LOCAL_CFLAGS += -DCONFIG_SWV8_DISK_ENCRYPTION
+endif
+
 # USE_ICE_FOR_STORAGE_ENCRYPTION would be true in future if
 # TARGET_USE_EMMC_USE_ICE is set
 ifeq ($(TARGET_USE_UFS_ICE),true)
diff --git a/cryptfs_hw.c b/cryptfs_hw.c
index 6695552..ff06c9f 100755
--- a/cryptfs_hw.c
+++ b/cryptfs_hw.c
@@ -64,6 +64,11 @@
 /* Operations that be performed on HW based device encryption key */
 #define SET_HW_DISK_ENC_KEY 1
 #define UPDATE_HW_DISK_ENC_KEY 2
+#define MAX_DEVICE_ID_LENGTH 4 /* 4 = 3 (MAX_SOC_ID_LENGTH) + 1 */
+
+static unsigned int cpu_id[] = {
+	239, /* MSM8939 SOC ID */
+};
 
 #define QSEECOM_UP_CHECK_COUNT 10
 
@@ -235,6 +240,58 @@ unsigned int is_hw_disk_encryption(const char* encryption_mode)
     return ret;
 }
 
+/*
+ * By default HW FDE is enabled, if the execution comes to
+ * is_hw_fde_enabled() API then for specific device/soc id,
+ * HW FDE is disabled.
+ */
+#ifdef CONFIG_SWV8_DISK_ENCRYPTION
+unsigned int is_hw_fde_enabled(void)
+{
+    unsigned int device_id = -1;
+    unsigned int array_size;
+    unsigned int status = 1;
+    FILE *fd = NULL;
+    unsigned int i;
+    int ret = -1;
+    char buf[MAX_DEVICE_ID_LENGTH];
+
+    fd = fopen("/sys/devices/soc0/soc_id", "r");
+    if (fd) {
+        ret = fread(buf, 1, MAX_DEVICE_ID_LENGTH, fd);
+        fclose(fd);
+    } else {
+        fd = fopen("/sys/devices/system/soc/soc0/id", "r");
+        if (fd) {
+            ret = fread(buf, 1, MAX_DEVICE_ID_LENGTH, fd);
+            fclose(fd);
+        }
+    }
+
+    if (ret > 0) {
+        device_id = atoi(buf);
+    } else {
+        SLOGE("Failed to read device id");
+        return status;
+    }
+
+    array_size = sizeof(cpu_id) / sizeof(cpu_id[0]);
+    for (i = 0; i < array_size; i++) {
+        if (device_id == cpu_id[i]) {
+            status = 0;
+            break;
+        }
+    }
+
+    return status;
+}
+#else
+unsigned int is_hw_fde_enabled(void)
+{
+    return 1;
+}
+#endif
+
 int is_ice_enabled(void)
 {
   char prop_storage[PATH_MAX];
diff --git a/cryptfs_hw.h b/cryptfs_hw.h
index e857c47..9862212 100755
--- a/cryptfs_hw.h
+++ b/cryptfs_hw.h
@@ -37,6 +37,7 @@ int set_hw_device_encryption_key(const char*, const char*);
 int update_hw_device_encryption_key(const char*, const char*, const char*);
 int clear_hw_device_encryption_key();
 unsigned int is_hw_disk_encryption(const char*);
+unsigned int is_hw_fde_enabled(void);
 int is_ice_enabled(void);
 int should_use_keymaster();
 
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