ANDROID: Add Android support

* Add Android.bp makefile to build rmtfs for AOSP.
* libudev is not supported on AOSP so read
  /sys/class/rmtfs sysfs entries directly.

Signed-off-by: Amit Pundir <amit.pundir@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>

Android.bp

@@ -0,0 +1,13 @@
+cc_binary {
+    name: "rmtfs",
+    vendor: true,
+    srcs: [
+        "qmi_rmtfs.c",
+        "rmtfs.c",
+        "rproc.c",
+        "sharedmem.c",
+        "storage.c",
+        "util.c",
+    ],
+    shared_libs: ["libqrtr"],
+}

sharedmem.c

@@ -4,7 +4,11 @@
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
+#ifndef ANDROID
 #include <libudev.h>
+#else
+#include <sys/endian.h>
+#endif
 #include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -22,6 +26,8 @@ struct rmtfs_mem {
 	int fd;
 };
 
+#ifndef ANDROID
+
 static int parse_hex_sysattr(struct udev_device *dev, const char *name,
 			     uint64_t *value)
 {
@@ -191,6 +197,65 @@ err_close_fd:
 	return -saved_errno;
 }
 
+#else
+
+#define PAGE_SIZE 4096
+
+static int rmtfs_mem_open_rfsa(struct rmtfs_mem *rmem, int client_id)
+{
+	int saved_errno;
+	int fd;
+	char path[PATH_MAX];
+	char val[PAGE_SIZE];
+	char *endptr;
+
+	errno = 0;
+
+	snprintf(path, sizeof(path), "/sys/class/rmtfs/qcom_rmtfs_mem%d/phys_addr", client_id);
+	fd = open(path, O_RDONLY);
+	if (fd < 0) {
+		saved_errno = errno;
+		fprintf(stderr, "failed to open %s: %s\n", path, strerror(errno));
+		return -saved_errno;
+	}
+	read(fd, val, sizeof(val));
+	rmem->address = strtoull(val, &endptr, 16);
+	if ((rmem->address == ULLONG_MAX && errno == ERANGE) || endptr == val) {
+		saved_errno = errno;
+		goto err_close_fd;
+	}
+	close(fd);
+
+	snprintf(path, sizeof(path), "/sys/class/rmtfs/qcom_rmtfs_mem%d/size", client_id);
+	fd = open(path, O_RDONLY);
+	if (fd < 0) {
+		saved_errno = errno;
+		fprintf(stderr, "failed to open %s: %s\n", path, strerror(errno));
+		return -saved_errno;
+	}
+	read(fd, val, sizeof(val));
+	rmem->size = strtoull(val, &endptr, 16);
+	if ((rmem->size == ULLONG_MAX && errno == ERANGE) || endptr == val) {
+		saved_errno = errno;
+		goto err_close_fd;
+	}
+	close(fd);
+
+	return 0;
+
+err_close_fd:
+	close(fd);
+	return -saved_errno;
+}
+
+static int rmtfs_mem_open_uio(struct rmtfs_mem *rmem, int client_id)
+{
+	fprintf(stderr, "uio access is not supported on ANDROID yet\n");
+	return -EINVAL;
+}
+
+#endif
+
 struct rmtfs_mem *rmtfs_mem_open(void)
 {
 	struct rmtfs_mem *rmem;

storage.c

@@ -11,7 +11,11 @@
 #define MAX_CALLERS 10
 #define STORAGE_MAX_SIZE (16 * 1024 * 1024)
 
+#ifndef ANDROID
 #define BY_PARTLABEL_PATH "/dev/disk/by-partlabel"
+#else
+#define BY_PARTLABEL_PATH "/dev/block/by-name"
+#endif
 
 #define MIN(x, y) ((x) < (y) ? (x) : (y))