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@@ -0,0 +1,672 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * USB CDC serial (ACM) function driver
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+ *
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+ * Copyright (C) 2003 Al Borchers (alborchers@steinerpoint.com)
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+ * Copyright (C) 2008 by David Brownell
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+ * Copyright (C) 2008 by Nokia Corporation
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+ * Copyright (C) 2009 by Samsung Electronics
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+ * Copyright (c) 2021, Linaro Ltd <loic.poulain@linaro.org>
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+ */
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+
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+#include <circbuf.h>
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+#include <common.h>
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+#include <console.h>
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+#include <errno.h>
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+#include <g_dnl.h>
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+#include <malloc.h>
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+#include <memalign.h>
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+#include <stdio_dev.h>
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+#include <version.h>
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+#include <watchdog.h>
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+
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+#include <linux/usb/ch9.h>
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+#include <linux/usb/gadget.h>
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+#include <linux/usb/composite.h>
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+#include <linux/usb/cdc.h>
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+
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+#define REQ_SIZE_MAX 512
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+
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+struct f_acm {
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+ int ctrl_id;
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+ int data_id;
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+
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+ struct usb_ep *ep_in;
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+ struct usb_ep *ep_out;
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+ struct usb_ep *ep_notify;
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+
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+ struct usb_request *req_in;
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+ struct usb_request *req_out;
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+
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+ bool connected;
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+ bool tx_on;
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+
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+ circbuf_t rx_buf;
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+ circbuf_t tx_buf;
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+
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+ struct usb_function usb_function;
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+
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+ struct usb_cdc_line_coding line_coding;
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+ u16 handshake_bits;
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+#define ACM_CTRL_RTS BIT(1) /* unused with full duplex */
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+#define ACM_CTRL_DTR BIT(0) /* host is ready for data r/w */
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+
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+ int controller_index;
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+};
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+
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+static struct f_acm *default_acm_function;
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+
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+static inline struct f_acm *func_to_acm(struct usb_function *f)
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+{
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+ return container_of(f, struct f_acm, usb_function);
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+}
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+
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+static inline struct f_acm *stdio_to_acm(struct stdio_dev *s)
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+{
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+ /* stdio dev is cloned on registration, do not use container_of */
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+ return s->priv;
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+}
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+
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+static struct usb_interface_assoc_descriptor
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+acm_iad_descriptor = {
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+ .bLength = sizeof(acm_iad_descriptor),
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+ .bDescriptorType = USB_DT_INTERFACE_ASSOCIATION,
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+ .bFirstInterface = 0,
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+ .bInterfaceCount = 2, // control + data
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+ .bFunctionClass = USB_CLASS_COMM,
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+ .bFunctionSubClass = USB_CDC_SUBCLASS_ACM,
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+ .bFunctionProtocol = USB_CDC_ACM_PROTO_AT_V25TER,
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+};
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+
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+static struct usb_interface_descriptor acm_control_intf_desc = {
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+ .bLength = USB_DT_INTERFACE_SIZE,
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+ .bDescriptorType = USB_DT_INTERFACE,
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+ .bNumEndpoints = 1,
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+ .bInterfaceClass = USB_CLASS_COMM,
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+ .bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
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+ .bInterfaceProtocol = USB_CDC_ACM_PROTO_AT_V25TER,
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+};
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+
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+static struct usb_interface_descriptor acm_data_intf_desc = {
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+ .bLength = sizeof(acm_data_intf_desc),
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+ .bDescriptorType = USB_DT_INTERFACE,
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+ .bNumEndpoints = 2,
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+ .bInterfaceClass = USB_CLASS_CDC_DATA,
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+};
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+
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+static struct usb_cdc_header_desc acm_header_desc = {
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+ .bLength = sizeof(acm_header_desc),
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+ .bDescriptorType = USB_DT_CS_INTERFACE,
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+ .bDescriptorSubType = USB_CDC_HEADER_TYPE,
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+ .bcdCDC = __constant_cpu_to_le16(0x0110),
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+};
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+
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+static struct usb_cdc_call_mgmt_descriptor acm_call_mgmt_desc = {
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+ .bLength = sizeof(acm_call_mgmt_desc),
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+ .bDescriptorType = USB_DT_CS_INTERFACE,
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+ .bDescriptorSubType = USB_CDC_CALL_MANAGEMENT_TYPE,
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+ .bmCapabilities = 0,
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+ .bDataInterface = 0x01,
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+};
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+
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+static struct usb_cdc_acm_descriptor acm_desc = {
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+ .bLength = sizeof(acm_desc),
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+ .bDescriptorType = USB_DT_CS_INTERFACE,
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+ .bDescriptorSubType = USB_CDC_ACM_TYPE,
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+ .bmCapabilities = USB_CDC_CAP_LINE,
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+};
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+
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+static struct usb_cdc_union_desc acm_union_desc = {
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+ .bLength = sizeof(acm_union_desc),
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+ .bDescriptorType = USB_DT_CS_INTERFACE,
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+ .bDescriptorSubType = USB_CDC_UNION_TYPE,
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+ .bMasterInterface0 = 0x00,
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+ .bSlaveInterface0 = 0x01,
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+};
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+
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+static struct usb_endpoint_descriptor acm_fs_notify_desc = {
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+ .bLength = USB_DT_ENDPOINT_SIZE,
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+ .bDescriptorType = USB_DT_ENDPOINT,
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+ .bEndpointAddress = 3 | USB_DIR_IN,
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+ .bmAttributes = USB_ENDPOINT_XFER_INT,
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+ .wMaxPacketSize = __constant_cpu_to_le16(64),
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+ .bInterval = 32,
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+};
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+
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+static struct usb_endpoint_descriptor acm_fs_in_desc = {
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+ .bLength = USB_DT_ENDPOINT_SIZE,
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+ .bDescriptorType = USB_DT_ENDPOINT,
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+ .bEndpointAddress = USB_DIR_IN,
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+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
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+};
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+
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+static struct usb_endpoint_descriptor acm_fs_out_desc = {
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+ .bLength = USB_DT_ENDPOINT_SIZE,
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+ .bDescriptorType = USB_DT_ENDPOINT,
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+ .bEndpointAddress = USB_DIR_OUT,
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+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
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+};
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+
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+static struct usb_descriptor_header *acm_fs_function[] = {
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+ (struct usb_descriptor_header *)&acm_iad_descriptor,
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+ (struct usb_descriptor_header *)&acm_control_intf_desc,
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+ (struct usb_descriptor_header *)&acm_header_desc,
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+ (struct usb_descriptor_header *)&acm_call_mgmt_desc,
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+ (struct usb_descriptor_header *)&acm_desc,
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+ (struct usb_descriptor_header *)&acm_union_desc,
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+ (struct usb_descriptor_header *)&acm_fs_notify_desc,
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+ (struct usb_descriptor_header *)&acm_data_intf_desc,
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+ (struct usb_descriptor_header *)&acm_fs_in_desc,
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+ (struct usb_descriptor_header *)&acm_fs_out_desc,
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+ NULL,
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+};
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+
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+static struct usb_endpoint_descriptor acm_hs_notify_desc = {
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+ .bLength = USB_DT_ENDPOINT_SIZE,
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+ .bDescriptorType = USB_DT_ENDPOINT,
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+ .bmAttributes = USB_ENDPOINT_XFER_INT,
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+ .wMaxPacketSize = __constant_cpu_to_le16(64),
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+ .bInterval = 11,
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+};
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+
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+static struct usb_endpoint_descriptor acm_hs_in_desc = {
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+ .bLength = USB_DT_ENDPOINT_SIZE,
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+ .bDescriptorType = USB_DT_ENDPOINT,
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+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
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+ .wMaxPacketSize = __constant_cpu_to_le16(512),
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+};
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+
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+static struct usb_endpoint_descriptor acm_hs_out_desc = {
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+ .bLength = USB_DT_ENDPOINT_SIZE,
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+ .bDescriptorType = USB_DT_ENDPOINT,
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+ .bmAttributes = USB_ENDPOINT_XFER_BULK,
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+ .wMaxPacketSize = __constant_cpu_to_le16(512),
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+};
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+
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+static struct usb_descriptor_header *acm_hs_function[] = {
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+ (struct usb_descriptor_header *)&acm_iad_descriptor,
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+ (struct usb_descriptor_header *)&acm_control_intf_desc,
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+ (struct usb_descriptor_header *)&acm_header_desc,
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+ (struct usb_descriptor_header *)&acm_call_mgmt_desc,
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+ (struct usb_descriptor_header *)&acm_desc,
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+ (struct usb_descriptor_header *)&acm_union_desc,
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+ (struct usb_descriptor_header *)&acm_hs_notify_desc,
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+ (struct usb_descriptor_header *)&acm_data_intf_desc,
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+ (struct usb_descriptor_header *)&acm_hs_in_desc,
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+ (struct usb_descriptor_header *)&acm_hs_out_desc,
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+ NULL,
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+};
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+
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+static inline struct usb_endpoint_descriptor *
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+ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *hs,
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+ struct usb_endpoint_descriptor *fs)
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+{
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+ if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH)
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+ return hs;
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+ return fs;
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+}
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+
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+static int acm_bind(struct usb_configuration *c, struct usb_function *f)
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+{
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+ struct usb_gadget *gadget = c->cdev->gadget;
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+ struct f_acm *f_acm = func_to_acm(f);
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+ struct usb_ep *ep;
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+ int id;
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+
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+ id = usb_interface_id(c, f);
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+ if (id < 0)
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+ return id;
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+
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+ acm_iad_descriptor.bFirstInterface = id;
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+ acm_control_intf_desc.bInterfaceNumber = id;
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+ acm_union_desc.bMasterInterface0 = id;
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+
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+ f_acm->ctrl_id = id;
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+
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+ id = usb_interface_id(c, f);
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+ if (id < 0)
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+ return id;
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+
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+ acm_data_intf_desc.bInterfaceNumber = id;
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+ acm_union_desc.bSlaveInterface0 = id;
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+ acm_call_mgmt_desc.bDataInterface = id;
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+
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+ f_acm->data_id = id;
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+
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+ /* allocate instance-specific endpoints */
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+ ep = usb_ep_autoconfig(gadget, &acm_fs_in_desc);
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+ if (!ep)
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+ return -ENODEV;
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+
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+ f_acm->ep_in = ep;
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+
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+ ep = usb_ep_autoconfig(gadget, &acm_fs_out_desc);
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+ if (!ep)
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+ return -ENODEV;
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+
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+ f_acm->ep_out = ep;
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+
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+ ep = usb_ep_autoconfig(gadget, &acm_fs_notify_desc);
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+ if (!ep)
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+ return -ENODEV;
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+
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+ f_acm->ep_notify = ep;
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+
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+ if (gadget_is_dualspeed(gadget)) {
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+ /* Assume endpoint addresses are the same for both speeds */
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+ acm_hs_in_desc.bEndpointAddress = acm_fs_in_desc.bEndpointAddress;
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+ acm_hs_out_desc.bEndpointAddress = acm_fs_out_desc.bEndpointAddress;
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+ acm_hs_notify_desc.bEndpointAddress = acm_fs_notify_desc.bEndpointAddress;
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+ }
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+
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+ return 0;
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+}
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+
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+static void acm_unbind(struct usb_configuration *c, struct usb_function *f)
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+{
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+ struct f_acm *f_acm = func_to_acm(f);
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+
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+ if (default_acm_function == f_acm)
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+ default_acm_function = NULL;
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+
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+ buf_free(&f_acm->rx_buf);
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+ buf_free(&f_acm->tx_buf);
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+
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+ free(f_acm);
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+}
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+
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+static void acm_notify_complete(struct usb_ep *ep, struct usb_request *req)
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+{
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+ /* nothing to do */
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+}
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+
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+static void acm_tx_complete(struct usb_ep *ep, struct usb_request *req)
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+{
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+ struct f_acm *f_acm = req->context;
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+
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+ f_acm->tx_on = true;
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+}
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+
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+static void acm_rx_complete(struct usb_ep *ep, struct usb_request *req)
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+{
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+ struct f_acm *f_acm = req->context;
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+
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+ buf_push(&f_acm->rx_buf, req->buf, req->actual);
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+
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+ /* Queue RX req again */
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+ req->actual = 0;
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+ usb_ep_queue(ep, req, 0);
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+}
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+
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+static struct usb_request *acm_start_ep(struct usb_ep *ep, void *complete_cb,
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+ void *context)
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+{
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+ struct usb_request *req;
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+
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+ req = usb_ep_alloc_request(ep, 0);
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+ if (!req)
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+ return NULL;
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+
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+ req->length = REQ_SIZE_MAX;
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+ req->buf = memalign(CONFIG_SYS_CACHELINE_SIZE, REQ_SIZE_MAX);
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+ if (!req->buf) {
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+ usb_ep_free_request(ep, req);
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+ return NULL;
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+ }
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+
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+ memset(req->buf, 0, req->length);
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+ req->complete = complete_cb;
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+ req->context = context;
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+
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+ return req;
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+}
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+
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+static int acm_start_data(struct f_acm *f_acm, struct usb_gadget *gadget)
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+{
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+ const struct usb_endpoint_descriptor *d;
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+ int ret;
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+
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+ /* EP IN */
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+ d = ep_desc(gadget, &acm_hs_in_desc, &acm_fs_in_desc);
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+ ret = usb_ep_enable(f_acm->ep_in, d);
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+ if (ret)
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+ return ret;
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+
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+ f_acm->req_in = acm_start_ep(f_acm->ep_in, acm_tx_complete, f_acm);
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+
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+ /* EP OUT */
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+ d = ep_desc(gadget, &acm_hs_out_desc, &acm_fs_out_desc);
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+ ret = usb_ep_enable(f_acm->ep_out, d);
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+ if (ret)
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+ return ret;
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+
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+ f_acm->req_out = acm_start_ep(f_acm->ep_out, acm_rx_complete, f_acm);
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+
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+ /* Start OUT transfer (EP OUT) */
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+ ret = usb_ep_queue(f_acm->ep_out, f_acm->req_out, 0);
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+ if (ret)
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+ return ret;
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+
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+ return 0;
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+}
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+
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+static int acm_start_ctrl(struct f_acm *f_acm, struct usb_gadget *gadget)
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+{
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+ const struct usb_endpoint_descriptor *d;
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+
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+ usb_ep_disable(f_acm->ep_notify);
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+
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+ d = ep_desc(gadget, &acm_hs_notify_desc, &acm_fs_notify_desc);
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+ usb_ep_enable(f_acm->ep_notify, d);
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+
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+ acm_start_ep(f_acm->ep_notify, acm_notify_complete, f_acm);
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+
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+ return 0;
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+}
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+
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+static int acm_set_alt(struct usb_function *f, unsigned int intf, unsigned int alt)
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+{
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+ struct usb_gadget *gadget = f->config->cdev->gadget;
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+ struct f_acm *f_acm = func_to_acm(f);
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+
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+ if (intf == f_acm->ctrl_id) {
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+ return acm_start_ctrl(f_acm, gadget);
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+ } else if (intf == f_acm->data_id) {
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+ acm_start_data(f_acm, gadget);
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+ f_acm->connected = true;
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+ f_acm->tx_on = true;
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+ return 0;
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+ }
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+
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+ return -EINVAL;
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+}
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+
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+static int acm_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
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+{
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+ struct usb_gadget *gadget = f->config->cdev->gadget;
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+ struct usb_request *req = f->config->cdev->req;
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+ u16 w_index = le16_to_cpu(ctrl->wIndex);
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+ u16 w_value = le16_to_cpu(ctrl->wValue);
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|
|
+ u16 w_length = le16_to_cpu(ctrl->wLength);
|
|
|
+ struct f_acm *f_acm = func_to_acm(f);
|
|
|
+ int value = -1;
|
|
|
+
|
|
|
+ switch ((ctrl->bRequestType << 8) | ctrl->bRequest) {
|
|
|
+ case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
|
|
|
+ | USB_CDC_REQ_SET_LINE_CODING:
|
|
|
+ /* SET_LINE_CODING */
|
|
|
+
|
|
|
+ if (w_length != sizeof(f_acm->line_coding) || w_index != f_acm->ctrl_id)
|
|
|
+ goto invalid;
|
|
|
+
|
|
|
+ value = w_length;
|
|
|
+
|
|
|
+ memcpy(&f_acm->line_coding, req->buf, value);
|
|
|
+
|
|
|
+ break;
|
|
|
+ case ((USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
|
|
|
+ | USB_CDC_REQ_GET_LINE_CODING:
|
|
|
+ /* GET_LINE_CODING */
|
|
|
+
|
|
|
+ if (w_length != sizeof(f_acm->line_coding) || w_index != f_acm->ctrl_id)
|
|
|
+ goto invalid;
|
|
|
+
|
|
|
+ value = w_length;
|
|
|
+
|
|
|
+ memcpy(req->buf, &f_acm->line_coding, value);
|
|
|
+
|
|
|
+ break;
|
|
|
+ case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
|
|
|
+ | USB_CDC_REQ_SET_CONTROL_LINE_STATE:
|
|
|
+ /* SET_CONTROL_LINE_STATE */
|
|
|
+
|
|
|
+ if (w_index != f_acm->ctrl_id)
|
|
|
+ goto invalid;
|
|
|
+
|
|
|
+ value = 0;
|
|
|
+
|
|
|
+ f_acm->handshake_bits = w_value;
|
|
|
+
|
|
|
+ break;
|
|
|
+ default:
|
|
|
+invalid:
|
|
|
+ printf("invalid control req%02x.%02x v%04x i%04x l%d\n",
|
|
|
+ ctrl->bRequestType, ctrl->bRequest, w_value, w_index,
|
|
|
+ w_length);
|
|
|
+ }
|
|
|
+
|
|
|
+ /* respond with data transfer or status phase? */
|
|
|
+ if (value >= 0) {
|
|
|
+ req->zero = 0;
|
|
|
+ req->length = value;
|
|
|
+ usb_ep_queue(gadget->ep0, req, GFP_ATOMIC);
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static void acm_disable(struct usb_function *f)
|
|
|
+{
|
|
|
+ struct f_acm *f_acm = func_to_acm(f);
|
|
|
+
|
|
|
+ usb_ep_disable(f_acm->ep_out);
|
|
|
+ usb_ep_disable(f_acm->ep_in);
|
|
|
+ usb_ep_disable(f_acm->ep_notify);
|
|
|
+
|
|
|
+ if (f_acm->req_out) {
|
|
|
+ free(f_acm->req_out->buf);
|
|
|
+ usb_ep_free_request(f_acm->ep_out, f_acm->req_out);
|
|
|
+ f_acm->req_out = NULL;
|
|
|
+ }
|
|
|
+
|
|
|
+ if (f_acm->req_in) {
|
|
|
+ free(f_acm->req_in->buf);
|
|
|
+ usb_ep_free_request(f_acm->ep_in, f_acm->req_in);
|
|
|
+ f_acm->req_in = NULL;
|
|
|
+ }
|
|
|
+}
|
|
|
+
|
|
|
+/* static strings, in UTF-8 */
|
|
|
+static struct usb_string acm_string_defs[] = {
|
|
|
+ [0].s = "CDC Abstract Control Model (ACM)",
|
|
|
+ [1].s = "CDC ACM Data",
|
|
|
+ [2].s = "CDC Serial",
|
|
|
+ { } /* end of list */
|
|
|
+};
|
|
|
+
|
|
|
+static struct usb_gadget_strings acm_string_table = {
|
|
|
+ .language = 0x0409, /* en-us */
|
|
|
+ .strings = acm_string_defs,
|
|
|
+};
|
|
|
+
|
|
|
+static struct usb_gadget_strings *acm_strings[] = {
|
|
|
+ &acm_string_table,
|
|
|
+ NULL,
|
|
|
+};
|
|
|
+
|
|
|
+static void __acm_tx(struct f_acm *f_acm)
|
|
|
+{
|
|
|
+ int len, ret;
|
|
|
+
|
|
|
+ do {
|
|
|
+ usb_gadget_handle_interrupts(f_acm->controller_index);
|
|
|
+
|
|
|
+ if (!(f_acm->handshake_bits & ACM_CTRL_DTR))
|
|
|
+ break;
|
|
|
+
|
|
|
+ if (!f_acm->tx_on)
|
|
|
+ continue;
|
|
|
+
|
|
|
+ len = buf_pop(&f_acm->tx_buf, f_acm->req_in->buf, REQ_SIZE_MAX);
|
|
|
+ if (!len)
|
|
|
+ break;
|
|
|
+
|
|
|
+ f_acm->req_in->length = len;
|
|
|
+
|
|
|
+ ret = usb_ep_queue(f_acm->ep_in, f_acm->req_in, 0);
|
|
|
+ if (ret)
|
|
|
+ break;
|
|
|
+
|
|
|
+ f_acm->tx_on = false;
|
|
|
+
|
|
|
+ /* Do not reset the watchdog, if TX is stuck there is probably
|
|
|
+ * a real issue.
|
|
|
+ */
|
|
|
+ } while (1);
|
|
|
+}
|
|
|
+
|
|
|
+static bool acm_connected(struct stdio_dev *dev)
|
|
|
+{
|
|
|
+ struct f_acm *f_acm = stdio_to_acm(dev);
|
|
|
+
|
|
|
+ /* give a chance to process udc irq */
|
|
|
+ usb_gadget_handle_interrupts(f_acm->controller_index);
|
|
|
+
|
|
|
+ return f_acm->connected;
|
|
|
+}
|
|
|
+
|
|
|
+static int acm_add(struct usb_configuration *c)
|
|
|
+{
|
|
|
+ struct f_acm *f_acm;
|
|
|
+ int status;
|
|
|
+
|
|
|
+ f_acm = calloc(1, sizeof(*f_acm));
|
|
|
+ if (!f_acm)
|
|
|
+ return -ENOMEM;
|
|
|
+
|
|
|
+ f_acm->usb_function.name = "f_acm";
|
|
|
+ f_acm->usb_function.bind = acm_bind;
|
|
|
+ f_acm->usb_function.unbind = acm_unbind;
|
|
|
+ f_acm->usb_function.set_alt = acm_set_alt;
|
|
|
+ f_acm->usb_function.disable = acm_disable;
|
|
|
+ f_acm->usb_function.strings = acm_strings;
|
|
|
+ f_acm->usb_function.descriptors = acm_fs_function;
|
|
|
+ f_acm->usb_function.hs_descriptors = acm_hs_function;
|
|
|
+ f_acm->usb_function.setup = acm_setup;
|
|
|
+ f_acm->controller_index = 0;
|
|
|
+
|
|
|
+ status = usb_add_function(c, &f_acm->usb_function);
|
|
|
+ if (status) {
|
|
|
+ free(f_acm);
|
|
|
+ return status;
|
|
|
+ }
|
|
|
+
|
|
|
+ buf_init(&f_acm->rx_buf, 2048);
|
|
|
+ buf_init(&f_acm->tx_buf, 2048);
|
|
|
+
|
|
|
+ if (!default_acm_function)
|
|
|
+ default_acm_function = f_acm;
|
|
|
+
|
|
|
+ return status;
|
|
|
+}
|
|
|
+
|
|
|
+DECLARE_GADGET_BIND_CALLBACK(usb_serial_acm, acm_add);
|
|
|
+
|
|
|
+/* STDIO */
|
|
|
+static int acm_stdio_tstc(struct stdio_dev *dev)
|
|
|
+{
|
|
|
+ struct f_acm *f_acm = stdio_to_acm(dev);
|
|
|
+
|
|
|
+ usb_gadget_handle_interrupts(f_acm->controller_index);
|
|
|
+
|
|
|
+ return (f_acm->rx_buf.size > 0);
|
|
|
+}
|
|
|
+
|
|
|
+static int acm_stdio_getc(struct stdio_dev *dev)
|
|
|
+{
|
|
|
+ struct f_acm *f_acm = stdio_to_acm(dev);
|
|
|
+ char c;
|
|
|
+
|
|
|
+ /* Wait for a character to arrive. */
|
|
|
+ while (!acm_stdio_tstc(dev))
|
|
|
+ WATCHDOG_RESET();
|
|
|
+
|
|
|
+ buf_pop(&f_acm->rx_buf, &c, 1);
|
|
|
+
|
|
|
+ return c;
|
|
|
+}
|
|
|
+
|
|
|
+static void acm_stdio_putc(struct stdio_dev *dev, const char c)
|
|
|
+{
|
|
|
+ struct f_acm *f_acm = stdio_to_acm(dev);
|
|
|
+
|
|
|
+ if (c == '\n')
|
|
|
+ buf_push(&f_acm->tx_buf, "\r", 1);
|
|
|
+
|
|
|
+ buf_push(&f_acm->tx_buf, &c, 1);
|
|
|
+
|
|
|
+ if (!f_acm->connected)
|
|
|
+ return;
|
|
|
+
|
|
|
+ __acm_tx(f_acm);
|
|
|
+}
|
|
|
+
|
|
|
+static void acm_stdio_puts(struct stdio_dev *dev, const char *str)
|
|
|
+{
|
|
|
+ struct f_acm *f_acm = stdio_to_acm(dev);
|
|
|
+
|
|
|
+ while (*str) {
|
|
|
+ if (*str == '\n')
|
|
|
+ buf_push(&f_acm->tx_buf, "\r", 1);
|
|
|
+
|
|
|
+ buf_push(&f_acm->tx_buf, str++, 1);
|
|
|
+ }
|
|
|
+
|
|
|
+ if (!f_acm->connected)
|
|
|
+ return;
|
|
|
+
|
|
|
+ __acm_tx(f_acm);
|
|
|
+}
|
|
|
+
|
|
|
+static int acm_stdio_start(struct stdio_dev *dev)
|
|
|
+{
|
|
|
+ int ret;
|
|
|
+
|
|
|
+ if (dev->priv) { /* function already exist */
|
|
|
+ return 0;
|
|
|
+ }
|
|
|
+
|
|
|
+ ret = g_dnl_register("usb_serial_acm");
|
|
|
+ if (ret)
|
|
|
+ return ret;
|
|
|
+
|
|
|
+ if (default_acm_function)
|
|
|
+ dev->priv = default_acm_function;
|
|
|
+ else
|
|
|
+ return -ENODEV;
|
|
|
+
|
|
|
+ while (!acm_connected(dev)) {
|
|
|
+ if (ctrlc())
|
|
|
+ return -ECANCELED;
|
|
|
+
|
|
|
+ WATCHDOG_RESET();
|
|
|
+ }
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+static int acm_stdio_stop(struct stdio_dev *dev)
|
|
|
+{
|
|
|
+ g_dnl_unregister();
|
|
|
+ g_dnl_clear_detach();
|
|
|
+
|
|
|
+ return 0;
|
|
|
+}
|
|
|
+
|
|
|
+int drv_usbacm_init(void)
|
|
|
+{
|
|
|
+ struct stdio_dev stdio;
|
|
|
+
|
|
|
+ strcpy(stdio.name, "usbacm");
|
|
|
+ stdio.flags = DEV_FLAGS_INPUT | DEV_FLAGS_OUTPUT;
|
|
|
+ stdio.tstc = acm_stdio_tstc;
|
|
|
+ stdio.getc = acm_stdio_getc;
|
|
|
+ stdio.putc = acm_stdio_putc;
|
|
|
+ stdio.puts = acm_stdio_puts;
|
|
|
+ stdio.start = acm_stdio_start;
|
|
|
+ stdio.stop = acm_stdio_stop;
|
|
|
+ stdio.priv = NULL;
|
|
|
+ stdio.ext = 0;
|
|
|
+
|
|
|
+ return stdio_register(&stdio);
|
|
|
+}
|