From fe7ec23a11a58dcaf5c1b03b837b662837020876 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Pawe=C5=82=20Szewczyk?= <p.szewczyk@samsung.com>
Date: Thu, 28 Jan 2016 17:22:01 +0100
Subject: [PATCH] usbhost: Add API for opening device
MIME-Version: 1.0
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Change-Id: If2cf9e117edb6ff35c5a8541c656999e1de03187
Signed-off-by: Paweł Szewczyk <p.szewczyk@samsung.com>
---
 src/deviced/dd-usbhost.h | 17 +++++++++++++
 src/libdeviced/usbhost.c | 36 +++++++++++++++++++++++++++
 src/usbhost/usb-host.c   | 65 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 118 insertions(+)

diff --git a/src/deviced/dd-usbhost.h b/src/deviced/dd-usbhost.h
index 424469b..eff38b0 100644
--- a/src/deviced/dd-usbhost.h
+++ b/src/deviced/dd-usbhost.h
@@ -248,6 +248,23 @@ int unmount_usb_storage(char *path);
  */
 int format_usb_storage(char *path);
 
+/**
+ * @par Description:
+ *      This API is used to open usb device \n
+ * @param[in] path path to device
+ * @return 0 on success, negative error code if failed
+ * @par Example
+ * @code
+ * ...
+ *
+ * r = open_usb_device(path, &fd);
+ * if (r < 0)
+ * 	printf("failed to open device");
+ *
+ * ...
+ * @endcode
+ */
+int open_usb_device(char *path, int *fd);
 
 /**
  * @} // end of CAPI_SYSTEM_DEVICED_USBHOST_MODULE
diff --git a/src/libdeviced/usbhost.c b/src/libdeviced/usbhost.c
index ad5104a..747be17 100644
--- a/src/libdeviced/usbhost.c
+++ b/src/libdeviced/usbhost.c
@@ -27,6 +27,7 @@
 
 #define ARRAY_SIZE(array) (sizeof(array) / sizeof(array[0]))
 
+#define METHOD_OPEN_DEVICE                "OpenDevice"
 #define METHOD_REQUEST_STORAGE_INFO_ALL   "StorageInfoAll"
 #define METHOD_REQUEST_STORAGE_MOUNT      "StorageMount"
 #define METHOD_REQUEST_STORAGE_UNMOUNT    "StorageUnmount"
@@ -252,3 +253,38 @@ API int format_usb_storage(char *path)
 	return dbus_method_sync(DEVICED_BUS_NAME, DEVICED_PATH_USBHOST,
 			DEVICED_INTERFACE_USBHOST, METHOD_REQUEST_STORAGE_FORMAT, "s", param);
 }
+
+API int open_usb_device(char *path, int *fd)
+{
+	DBusMessage *reply;
+	DBusError err;
+	int ret, rfd;
+	dbus_bool_t result;
+
+	if (!fd || !path)
+		return -EINVAL;
+
+	dbus_error_init(&err);
+
+	reply = dbus_method_sync_with_reply(DEVICED_BUS_NAME,
+			DEVICED_PATH_USBHOST,
+			DEVICED_INTERFACE_USBHOST,
+			METHOD_OPEN_DEVICE,
+			"s", &path);
+
+	if (!reply) {
+		_E("Unable to send USB device request");
+		return -1;
+	}
+
+	result = dbus_message_get_args(reply, &err, DBUS_TYPE_INT32, &ret, DBUS_TYPE_UNIX_FD, &rfd, DBUS_TYPE_INVALID);
+	if (!result) {
+		_E("Failed to get arguments: %s", err.message);
+		return -1;
+	}
+
+	if (ret >= 0)
+		*fd = rfd;
+
+	return ret;
+}
diff --git a/src/usbhost/usb-host.c b/src/usbhost/usb-host.c
index 9fead6c..248f249 100644
--- a/src/usbhost/usb-host.c
+++ b/src/usbhost/usb-host.c
@@ -448,10 +448,75 @@ static struct uevent_handler uh = {
 	.uevent_func = uevent_usbhost_handler,
 };
 
+enum policy_value {
+	POLICY_ALLOW,
+	POLICY_DENY,
+};
+
+static int get_policy_value(const char *path)
+{
+	/* TODO */
+
+	return POLICY_ALLOW;
+}
+
+static DBusMessage *open_device(E_DBus_Object *obj, DBusMessage *msg)
+{
+	DBusMessageIter iter;
+	DBusMessage *reply;
+	DBusError err;
+	dbus_bool_t dbus_ret;
+	int ret = 0, fd = -1;
+	const char *path;
+	struct device d;
+
+	dbus_error_init(&err);
+
+	dbus_ret = dbus_message_get_args(msg, &err, DBUS_TYPE_STRING, &path);
+	if (!dbus_ret) {
+		_E("Unable to get arguments from message: %s", err.message);
+		ret = -EINVAL;
+		goto out;
+	}
+
+	reply = dbus_message_new_method_return(msg);
+	if (!reply) {
+		_E("Cannot allocate memory for message");
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	ret = get_policy_value(path);
+	switch (ret) {
+	case POLICY_ALLOW:
+		fd = open(path, O_RDWR);
+		if (fd < 0) {
+			ret = -errno;
+			_E("Unable to open file (%s): %m", path);
+		} else
+			ret = 0;
+		break;
+	case POLICY_DENY:
+		ret = -EACCES;
+		break;
+	default:
+		/* ret has error code */
+		break;
+	}
+
+out:
+	dbus_message_iter_init_append(reply, &iter);
+	dbus_message_iter_append_basic(&iter, DBUS_TYPE_INT32, &ret);
+	dbus_message_iter_append_basic(&iter, DBUS_TYPE_UNIX_FD, &fd);
+
+	return reply;
+}
+
 static const struct edbus_method edbus_methods[] = {
 	{ "PrintDeviceList",   NULL,           NULL, print_device_list }, /* for debugging */
 	{ "GetDeviceList",      "i", "a(siiiiisss)", get_device_list },
 	{ "GetDeviceListCount", "i",            "i", get_device_list_count },
+	{ "OpenDevice",         "s",           "ih", open_device },
 };
 
 static int booting_done(void *data)
-- 
2.7.4