Add cdc-acm related implementation of thor protocol

Thor protocol "emulates" cdc-acm class. This commit adds
some helper functions which are required to properly
setup communication on cdc-acm protocol level.

Change-Id: Iffb79c813f97bc3f3c4260f6fd713d0ea4d99353
Signed-off-by: Krzysztof Opasiak <k.opasiak@samsung.com>

2 files changed, 115 insertions, 0 deletions

diff --git a/libthor/thor_acm.c b/libthor/thor_acm.c
new file mode 100644
index 0000000..69eae53
--- /dev/null
+++ b/libthor/thor_acm.c
@@ -0,0 +1,113 @@
+/*
+ * libthor - Tizen Thor communication protocol
+ *
+ * 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 <sys/types.h>
+#include <stdio.h>
+#include <endian.h>
+#ifdef __linux__
+#include <linux/usb/cdc.h>
+#else
+#include <stdint.h>
+
+#ifdef __APPLE__
+#include <libkern/OSByteOrder.h>
+
+#define htole32(x) OSSwapHostToLittleInt32(x)
+#endif
+
+struct usb_cdc_line_coding {
+	uint32_t	dwDTERate; /* little endian */
+	uint8_t	bCharFormat;
+#define USB_CDC_1_STOP_BITS			0
+
+	uint8_t	bParityType;
+#define USB_CDC_NO_PARITY			0
+
+	uint8_t	bDataBits;
+} __attribute__ ((packed));
+
+#define USB_CDC_REQ_SET_LINE_CODING		0x20
+#define USB_CDC_REQ_SET_CONTROL_LINE_STATE	0x22
+#endif
+
+#include <libusb-1.0/libusb.h>
+
+#include "thor_internal.h"
+
+static int acm_set_control_line_state(struct thor_device_handle *th, int state)
+{
+	int ret;
+
+	ret = libusb_control_transfer(th->devh,
+				      LIBUSB_REQUEST_TYPE_CLASS |
+				      LIBUSB_RECIPIENT_INTERFACE,
+				      USB_CDC_REQ_SET_CONTROL_LINE_STATE,
+				      state ? 0x3 : 0,
+				      (uint16_t)th->control_interface_id,
+				      NULL,
+				      0,
+				      DEFAULT_TIMEOUT);
+
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int acm_set_line_coding(struct thor_device_handle *th)
+{
+	struct usb_cdc_line_coding default_thor_line_coding = {
+		.dwDTERate = htole32(9600),
+		.bCharFormat = USB_CDC_1_STOP_BITS,
+		.bParityType = USB_CDC_NO_PARITY,
+		.bDataBits = 8,
+	};
+	int ret;
+
+	ret = libusb_control_transfer(th->devh,
+				      LIBUSB_REQUEST_TYPE_CLASS |
+				      LIBUSB_RECIPIENT_INTERFACE,
+				      USB_CDC_REQ_SET_LINE_CODING,
+				      0,
+				      (uint16_t)th->control_interface_id,
+				      (unsigned char *)&default_thor_line_coding,
+				      sizeof(default_thor_line_coding),
+				      DEFAULT_TIMEOUT);
+
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+
+int t_acm_prepare_device(struct thor_device_handle *th)
+{
+	int ret;
+
+	ret = acm_set_control_line_state(th, 0);
+	if (ret < 0)
+		return ret;
+
+	ret = acm_set_line_coding(th);
+	if (ret < 0)
+		return ret;
+
+	ret = acm_set_control_line_state(th, 1);
+
+	return ret;
+}
+
diff --git a/libthor/thor_internal.h b/libthor/thor_internal.h
index 20085b4..70ccfd4 100644
--- a/libthor/thor_internal.h
+++ b/libthor/thor_internal.h
@@ -65,5 +65,7 @@ int t_usb_find_device(struct thor_device_id *dev_id, int wait,
 
 void t_usb_close_device(struct thor_device_handle *th);
 
+int t_acm_prepare_device(struct thor_device_handle *th);
+
 #endif /* THOR_INTERNAL_H__ */