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zephyr/usb/class/cdc_acm.c

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/*******************************************************************************
*
* Copyright(c) 2015,2016 Intel Corporation.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************/
/**
* @file
* @brief CDC ACM device class driver
*
* Driver for USB CDC ACM device class driver
*/
#include <nanokernel.h>
#include <init.h>
#include <uart.h>
#include <string.h>
#include <misc/byteorder.h>
#include "cdc_acm.h"
#include "usb_device.h"
#include "usb_common.h"
#ifndef CONFIG_UART_INTERRUPT_DRIVEN
#error "CONFIG_UART_INTERRUPT_DRIVEN must be set for CDC ACM driver"
#endif
/* definitions */
#define SYS_LOG_LEVEL CONFIG_SYS_LOG_USB_CDC_ACM_LEVEL
#include <misc/sys_log.h>
#define DEV_DATA(dev) \
((struct cdc_acm_dev_data_t * const)(dev)->driver_data)
static struct uart_driver_api cdc_acm_driver_api;
/* 115200bps, no parity, 1 stop bit, 8bit char */
#define CDC_ACM_DEFAUL_BAUDRATE {sys_cpu_to_le32(115200), 0, 0, 8}
/* Size of the internal buffer used for storing received data */
#define CDC_ACM_BUFFER_SIZE (2 * CDC_BULK_EP_MPS)
/* Misc. macros */
#define LOW_BYTE(x) ((x) & 0xFF)
#define HIGH_BYTE(x) ((x) >> 8)
struct device *cdc_acm_dev;
/* Device data structure */
struct cdc_acm_dev_data_t {
/* USB device status code */
enum usb_dc_status_code usb_status;
/* Callback function pointer */
uart_irq_callback_t cb;
/* Tx ready status. Signals when */
uint8_t tx_ready;
uint8_t rx_ready; /* Rx ready status */
uint8_t tx_irq_ena; /* Tx interrupt enable status */
uint8_t rx_irq_ena; /* Rx interrupt enable status */
uint8_t rx_buf[CDC_ACM_BUFFER_SIZE];/* Internal Rx buffer */
uint32_t rx_buf_head; /* Head of the internal Rx buffer */
uint32_t rx_buf_tail; /* Tail of the internal Rx buffer */
/* Interface data buffer */
uint8_t interface_data[CDC_CLASS_REQ_MAX_DATA_SIZE];
/* CDC ACM line coding properties. LE order */
struct cdc_acm_line_coding line_coding;
/* CDC ACM line state bitmap, DTE side */
uint8_t line_state;
/* CDC ACM serial state bitmap, DCE side */
uint8_t serial_state;
/* CDC ACM notification sent status */
uint8_t notification_sent;
};
/* Structure representing the global USB description */
static const uint8_t cdc_acm_usb_description[] = {
/* Device descriptor */
USB_DEVICE_DESC_SIZE, /* Descriptor size */
USB_DEVICE_DESC, /* Descriptor type */
LOW_BYTE(USB_1_1),
HIGH_BYTE(USB_1_1), /* USB version in BCD format */
COMMUNICATION_DEVICE_CLASS, /* Class */
0x00, /* SubClass - Interface specific */
0x00, /* Protocol - Interface specific */
MAX_PACKET_SIZE0, /* Max Packet Size */
LOW_BYTE(CDC_VENDOR_ID),
HIGH_BYTE(CDC_VENDOR_ID), /* Vendor Id */
LOW_BYTE(CDC_PRODUCT_ID),
HIGH_BYTE(CDC_PRODUCT_ID), /* Product Id */
LOW_BYTE(BCDDEVICE_RELNUM),
HIGH_BYTE(BCDDEVICE_RELNUM), /* Device Release Number */
/* Index of Manufacturer String Descriptor */
0x01,
/* Index of Product String Descriptor */
0x02,
/* Index of Serial Number String Descriptor */
0x03,
CDC_NUM_CONF, /* Number of Possible Configuration */
/* Configuration descriptor */
USB_CONFIGURATION_DESC_SIZE, /* Descriptor size */
USB_CONFIGURATION_DESC, /* Descriptor type */
/* Total length in bytes of data returned */
LOW_BYTE(CDC_CONF_SIZE),
HIGH_BYTE(CDC_CONF_SIZE),
CDC_NUM_ITF, /* Number of interfaces */
0x01, /* Configuration value */
0x00, /* Index of the Configuration string */
USB_CONFIGURATION_ATTRIBUTES, /* Attributes */
MAX_LOW_POWER, /* Max power consumption */
/* Interface descriptor */
USB_INTERFACE_DESC_SIZE, /* Descriptor size */
USB_INTERFACE_DESC, /* Descriptor type */
0x00, /* Interface index */
0x00, /* Alternate setting */
CDC1_NUM_EP, /* Number of Endpoints */
COMMUNICATION_DEVICE_CLASS, /* Class */
ACM_SUBCLASS, /* SubClass */
V25TER_PROTOCOL, /* Protocol */
/* Index of the Interface String Descriptor */
0x00,
/* Header Functional Descriptor */
USB_HFUNC_DESC_SIZE, /* Descriptor size */
CS_INTERFACE, /* Descriptor type */
USB_HFUNC_SUBDESC, /* Descriptor SubType */
LOW_BYTE(USB_1_1),
HIGH_BYTE(USB_1_1), /* CDC Device Release Number */
/* Call Management Functional Descriptor */
USB_CMFUNC_DESC_SIZE, /* Descriptor size */
CS_INTERFACE, /* Descriptor type */
USB_CMFUNC_SUBDESC, /* Descriptor SubType */
0x00, /* Capabilities */
0x01, /* Data Interface */
/* ACM Functional Descriptor */
USB_ACMFUNC_DESC_SIZE, /* Descriptor size */
CS_INTERFACE, /* Descriptor type */
USB_ACMFUNC_SUBDESC, /* Descriptor SubType */
/* Capabilities - Device supports the request combination of:
* Set_Line_Coding,
* Set_Control_Line_State,
* Get_Line_Coding
* and the notification Serial_State
*/
0x02,
/* Union Functional Descriptor */
USB_UFUNC_DESC_SIZE, /* Descriptor size */
CS_INTERFACE, /* Descriptor type */
USB_UFUNC_SUBDESC, /* Descriptor SubType */
0x00, /* Master Interface */
0x01, /* Slave Interface */
/* Endpoint INT */
USB_ENDPOINT_DESC_SIZE, /* Descriptor size */
USB_ENDPOINT_DESC, /* Descriptor type */
CDC_ENDP_INT, /* Endpoint address */
USB_DC_EP_INTERRUPT, /* Attributes */
LOW_BYTE(CDC_INTERRUPT_EP_MPS),
HIGH_BYTE(CDC_INTERRUPT_EP_MPS),/* Max packet size */
0x0A, /* Interval */
/* Interface descriptor */
USB_INTERFACE_DESC_SIZE, /* Descriptor size */
USB_INTERFACE_DESC, /* Descriptor type */
0x01, /* Interface index */
0x00, /* Alternate setting */
CDC2_NUM_EP, /* Number of Endpoints */
COMMUNICATION_DEVICE_CLASS_DATA,/* Class */
0x00, /* SubClass */
0x00, /* Protocol */
/* Index of the Interface String Descriptor */
0x00,
/* First Endpoint IN */
USB_ENDPOINT_DESC_SIZE, /* Descriptor size */
USB_ENDPOINT_DESC, /* Descriptor type */
CDC_ENDP_IN, /* Endpoint address */
USB_DC_EP_BULK, /* Attributes */
LOW_BYTE(CDC_BULK_EP_MPS),
HIGH_BYTE(CDC_BULK_EP_MPS), /* Max packet size */
0x00, /* Interval */
/* Second Endpoint OUT */
USB_ENDPOINT_DESC_SIZE, /* Descriptor size */
USB_ENDPOINT_DESC, /* Descriptor type */
CDC_ENDP_OUT, /* Endpoint address */
USB_DC_EP_BULK, /* Attributes */
LOW_BYTE(CDC_BULK_EP_MPS),
HIGH_BYTE(CDC_BULK_EP_MPS), /* Max packet size */
0x00, /* Interval */
/* String descriptor language, only one, so min size 4 bytes.
* 0x0409 English(US) language code used
*/
USB_STRING_DESC_SIZE, /* Descriptor size */
USB_STRING_DESC, /* Descriptor type */
0x09,
0x04,
/* Manufacturer String Descriptor "Intel" */
0x0C,
USB_STRING_DESC,
'I', 0, 'n', 0, 't', 0, 'e', 0, 'l', 0,
/* Product String Descriptor "CDC-ACM" */
0x10,
USB_STRING_DESC,
'C', 0, 'D', 0, 'C', 0, '-', 0, 'A', 0, 'C', 0, 'M', 0,
/* Serial Number String Descriptor "00.01" */
0x0C,
USB_STRING_DESC,
'0', 0, '0', 0, '.', 0, '0', 0, '1', 0,
};
/**
* @brief Handler called for Class requests not handled by the USB stack.
*
* @param pSetup Information about the request to execute.
* @param len Size of the buffer.
* @param data Buffer containing the request result.
*
* @return 0 on success, negative errno code on fail.
*/
int cdc_acm_class_handle_req(struct usb_setup_packet *pSetup,
int32_t *len, uint8_t **data)
{
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(cdc_acm_dev);
switch (pSetup->bRequest) {
case CDC_SET_LINE_CODING:
memcpy(&dev_data->line_coding,
*data, sizeof(dev_data->line_coding));
SYS_LOG_DBG("\nCDC_SET_LINE_CODING %d %d %d %d",
sys_le32_to_cpu(dev_data->line_coding.dwDTERate),
dev_data->line_coding.bCharFormat,
dev_data->line_coding.bParityType,
dev_data->line_coding.bDataBits);
break;
case CDC_SET_CONTROL_LINE_STATE:
dev_data->line_state = (uint8_t)sys_le16_to_cpu(pSetup->wValue);
SYS_LOG_DBG("CDC_SET_CONTROL_LINE_STATE 0x%x",
dev_data->line_state);
break;
case CDC_GET_LINE_CODING:
*data = (uint8_t *)(&dev_data->line_coding);
*len = sizeof(dev_data->line_coding);
SYS_LOG_DBG("\nCDC_GET_LINE_CODING %d %d %d %d",
sys_le32_to_cpu(dev_data->line_coding.dwDTERate),
dev_data->line_coding.bCharFormat,
dev_data->line_coding.bParityType,
dev_data->line_coding.bDataBits);
break;
default:
SYS_LOG_DBG("CDC ACM request 0x%x, value 0x%x",
pSetup->bRequest, pSetup->wValue);
return -EINVAL;
}
return 0;
}
/**
* @brief EP Bulk IN handler, used to send data to the Host
*
* @param ep Endpoint address.
* @param ep_status Endpoint status code.
*
* @return N/A.
*/
static void cdc_acm_bulk_in(uint8_t ep, enum usb_dc_ep_cb_status_code ep_status)
{
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(cdc_acm_dev);
dev_data->tx_ready = 1;
/* Call callback only if tx irq ena */
if (dev_data->cb && dev_data->tx_irq_ena)
dev_data->cb(cdc_acm_dev);
}
/**
* @brief EP Bulk OUT handler, used to read the data received from the Host
*
* @param ep Endpoint address.
* @param ep_status Endpoint status code.
*
* @return N/A.
*/
static void cdc_acm_bulk_out(uint8_t ep,
enum usb_dc_ep_cb_status_code ep_status)
{
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(cdc_acm_dev);
uint32_t bytes_to_read, i, j, buf_head;
uint8_t tmp_buf[4];
/* Check how many bytes were received */
usb_read(ep, NULL, 0, &bytes_to_read);
buf_head = dev_data->rx_buf_head;
/*
* Quark SE USB controller is always storing data
* in the FIFOs per 32-bit words.
*/
for (i = 0; i < bytes_to_read; i += 4) {
usb_read(ep, tmp_buf, 4, NULL);
for (j = 0; j < 4; j++) {
if (i + j == bytes_to_read) {
/* We read all the data */
break;
}
if (((buf_head + 1) % CDC_ACM_BUFFER_SIZE) ==
dev_data->rx_buf_tail) {
/* FIFO full, discard data */
SYS_LOG_ERR("CDC buffer full!");
} else {
dev_data->rx_buf[buf_head] = tmp_buf[j];
buf_head = (buf_head + 1) % CDC_ACM_BUFFER_SIZE;
}
}
}
dev_data->rx_buf_head = buf_head;
dev_data->rx_ready = 1;
/* Call callback only if rx irq ena */
if (dev_data->cb && dev_data->rx_irq_ena)
dev_data->cb(cdc_acm_dev);
}
/**
* @brief EP Interrupt handler
*
* @param ep Endpoint address.
* @param ep_status Endpoint status code.
*
* @return N/A.
*/
static void cdc_acm_int_in(uint8_t ep, enum usb_dc_ep_cb_status_code ep_status)
{
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(cdc_acm_dev);
dev_data->notification_sent = 1;
SYS_LOG_DBG("CDC_IntIN EP[%x]\r", ep);
}
/**
* @brief Callback used to know the USB connection status
*
* @param status USB device status code.
*
* @return N/A.
*/
static void cdc_acm_dev_status_cb(enum usb_dc_status_code status)
{
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(cdc_acm_dev);
/* Store the new status */
dev_data->usb_status = status;
/* Check the USB status and do needed action if required */
switch (status) {
case USB_DC_ERROR:
SYS_LOG_DBG("USB device error");
break;
case USB_DC_RESET:
SYS_LOG_DBG("USB device reset detected");
break;
case USB_DC_CONNECTED:
SYS_LOG_DBG("USB device connected");
break;
case USB_DC_CONFIGURED:
SYS_LOG_DBG("USB device configured");
break;
case USB_DC_DISCONNECTED:
SYS_LOG_DBG("USB device disconnected");
break;
case USB_DC_SUSPEND:
SYS_LOG_DBG("USB device supended");
break;
case USB_DC_RESUME:
SYS_LOG_DBG("USB device resumed");
break;
case USB_DC_UNKNOWN:
default:
SYS_LOG_DBG("USB unknown state");
break;
}
}
/* Describe EndPoints configuration */
static struct usb_ep_cfg_data cdc_acm_ep_data[] = {
{
.ep_cb = cdc_acm_int_in,
.ep_addr = CDC_ENDP_INT
},
{
.ep_cb = cdc_acm_bulk_out,
.ep_addr = CDC_ENDP_OUT
},
{
.ep_cb = cdc_acm_bulk_in,
.ep_addr = CDC_ENDP_IN
}
};
/* Configuration of the CDC-ACM Device send to the USB Driver */
static struct usb_cfg_data cdc_acm_config = {
.usb_device_description = cdc_acm_usb_description,
.cb_usb_status = cdc_acm_dev_status_cb,
.interface = {
.class_handler = cdc_acm_class_handle_req,
.custom_handler = NULL,
.payload_data = NULL,
},
.num_endpoints = CDC1_NUM_EP + CDC2_NUM_EP,
.endpoint = cdc_acm_ep_data
};
/**
* @brief Set the baud rate
*
* This routine set the given baud rate for the UART.
*
* @param dev CDC ACM device struct.
* @param baudrate Baud rate.
*
* @return N/A.
*/
static void cdc_acm_baudrate_set(struct device *dev, uint32_t baudrate)
{
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(dev);
dev_data->line_coding.dwDTERate = sys_cpu_to_le32(baudrate);
}
/**
* @brief Initialize UART channel
*
* This routine is called to reset the chip in a quiescent state.
* It is assumed that this function is called only once per UART.
*
* @param dev CDC ACM device struct.
*
* @return 0 allways.
*/
static int cdc_acm_init(struct device *dev)
{
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(dev);
int ret;
cdc_acm_config.interface.payload_data = dev_data->interface_data;
cdc_acm_dev = dev;
/* Initialize the USB driver with the right configuration */
ret = usb_set_config(&cdc_acm_config);
if (ret < 0) {
SYS_LOG_ERR("Failed to config USB");
return ret;
}
/* Enable USB driver */
ret = usb_enable(&cdc_acm_config);
if (ret < 0) {
SYS_LOG_ERR("Failed to enable USB");
return ret;
}
dev->driver_api = &cdc_acm_driver_api;
return 0;
}
/**
* @brief Fill FIFO with data
*
* @param dev CDC ACM device struct.
* @param tx_data Data to transmit.
* @param len Number of bytes to send.
*
* @return Number of bytes sent.
*/
static int cdc_acm_fifo_fill(struct device *dev,
const uint8_t *tx_data, int len)
{
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(dev);
uint32_t bytes_written = 0;
if (dev_data->usb_status != USB_DC_CONFIGURED)
return 0;
dev_data->tx_ready = 0;
usb_write(CDC_ENDP_IN, tx_data, len, &bytes_written);
return bytes_written;
}
/**
* @brief Read data from FIFO
*
* @param dev CDC ACM device struct.
* @param rx_data Pointer to data container.
* @param size Container size.
*
* @return Number of bytes read.
*/
static int cdc_acm_fifo_read(struct device *dev, uint8_t *rx_data,
const int size)
{
uint32_t avail_data, bytes_read, i;
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(dev);
avail_data = (CDC_ACM_BUFFER_SIZE + dev_data->rx_buf_head -
dev_data->rx_buf_tail) % CDC_ACM_BUFFER_SIZE;
if (avail_data > size)
bytes_read = size;
else
bytes_read = avail_data;
for (i = 0; i < bytes_read; i++)
rx_data[i] = dev_data->rx_buf[(dev_data->rx_buf_tail + i) %
CDC_ACM_BUFFER_SIZE];
dev_data->rx_buf_tail = (dev_data->rx_buf_tail + bytes_read) %
CDC_ACM_BUFFER_SIZE;
if (dev_data->rx_buf_tail == dev_data->rx_buf_head) {
/* Buffer empty */
dev_data->rx_ready = 0;
}
return bytes_read;
}
/**
* @brief Enable TX interrupt
*
* @param dev CDC ACM device struct.
*
* @return N/A.
*/
static void cdc_acm_irq_tx_enable(struct device *dev)
{
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(dev);
dev_data->tx_irq_ena = 1;
}
/**
* @brief Disable TX interrupt
*
* @param dev CDC ACM device struct.
*
* @return N/A.
*/
static void cdc_acm_irq_tx_disable(struct device *dev)
{
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(dev);
dev_data->tx_irq_ena = 0;
}
/**
* @brief Check if Tx IRQ has been raised
*
* @param dev CDC ACM device struct.
*
* @return 1 if a Tx IRQ is pending, 0 otherwise.
*/
static int cdc_acm_irq_tx_ready(struct device *dev)
{
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(dev);
if (dev_data->tx_ready) {
dev_data->tx_ready = 0;
return 1;
}
return 0;
}
/**
* @brief Enable RX interrupt
*
* @param dev CDC ACM device struct.
*
* @return N/A
*/
static void cdc_acm_irq_rx_enable(struct device *dev)
{
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(dev);
dev_data->rx_irq_ena = 1;
}
/**
* @brief Disable RX interrupt
*
* @param dev CDC ACM device struct.
*
* @return N/A.
*/
static void cdc_acm_irq_rx_disable(struct device *dev)
{
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(dev);
dev_data->rx_irq_ena = 0;
}
/**
* @brief Check if Rx IRQ has been raised
*
* @param dev CDC ACM device struct.
*
* @return 1 if an IRQ is ready, 0 otherwise.
*/
static int cdc_acm_irq_rx_ready(struct device *dev)
{
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(dev);
if (dev_data->rx_ready) {
dev_data->rx_ready = 0;
return 1;
}
return 0;
}
/**
* @brief Check if Tx or Rx IRQ is pending
*
* @param dev CDC ACM device struct.
*
* @return 1 if a Tx or Rx IRQ is pending, 0 otherwise.
*/
static int cdc_acm_irq_is_pending(struct device *dev)
{
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(dev);
if (dev_data->tx_ready || dev_data->rx_ready)
return 1;
return 0;
}
/**
* @brief Update IRQ status
*
* @param dev CDC ACM device struct.
*
* @return Always 1
*/
static int cdc_acm_irq_update(struct device *dev)
{
return 1;
}
/**
* @brief Set the callback function pointer for IRQ.
*
* @param dev CDC ACM device struct.
* @param cb Callback function pointer.
*
* @return N/A
*/
static void cdc_acm_irq_callback_set(struct device *dev,
uart_irq_callback_t cb)
{
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(dev);
dev_data->cb = cb;
}
#ifdef CONFIG_UART_LINE_CTRL
/**
* @brief Send serial line state notification to the Host
*
* This routine sends asynchronous notification of UART status
* on the interrupt endpoint
*
* @param dev CDC ACM device struct.
* @param ep_status Endpoint status code.
*
* @return N/A.
*/
static int cdc_acm_send_notification(struct device *dev, uint16_t serial_state)
{
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(dev);
struct cdc_acm_notification notification;
uint32_t cnt = 0;
notification.bmRequestType = 0xA1;
notification.bNotificationType = 0x20;
notification.wValue = 0;
notification.wIndex = 0;
notification.wLength = sys_cpu_to_le16(sizeof(serial_state));
notification.data = sys_cpu_to_le16(serial_state);
dev_data->notification_sent = 0;
usb_write(CDC_ENDP_INT, (const uint8_t *)&notification,
sizeof(notification), NULL);
/* Wait for notification to be sent */
while (!((volatile uint8_t)dev_data->notification_sent)) {
sys_thread_busy_wait(1);
if (++cnt > CDC_CONTROL_SERIAL_STATE_TIMEOUT_US) {
SYS_LOG_DBG("CDC ACM notification timeout!");
return -EIO;
}
}
return 0;
}
/**
* @brief Manipulate line control for UART.
*
* @param dev CDC ACM device struct
* @param ctrl The line control to be manipulated
* @param val Value to set the line control
*
* @return 0 if successful, failed otherwise.
*/
static int cdc_acm_line_ctrl_set(struct device *dev,
uint32_t ctrl, uint32_t val)
{
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(dev);
switch (ctrl) {
case LINE_CTRL_BAUD_RATE:
cdc_acm_baudrate_set(dev, val);
return 0;
case LINE_CTRL_DCD:
dev_data->serial_state &= ~CDC_CONTROL_SERIAL_STATE_DCD;
if (val)
dev_data->serial_state |= CDC_CONTROL_SERIAL_STATE_DCD;
cdc_acm_send_notification(dev, CDC_CONTROL_SERIAL_STATE_DCD);
return 0;
case LINE_CTRL_DSR:
dev_data->serial_state &= ~CDC_CONTROL_SERIAL_STATE_DSR;
if (val)
dev_data->serial_state |= CDC_CONTROL_SERIAL_STATE_DSR;
cdc_acm_send_notification(dev, dev_data->serial_state);
return 0;
default:
return -ENODEV;
}
return -ENOTSUP;
}
/**
* @brief Manipulate line control for UART.
*
* @param dev CDC ACM device struct
* @param ctrl The line control to be manipulated
* @param val Value to set the line control
*
* @return 0 if successful, failed otherwise.
*/
static int cdc_acm_line_ctrl_get(struct device *dev,
uint32_t ctrl, uint32_t *val)
{
struct cdc_acm_dev_data_t * const dev_data = DEV_DATA(dev);
switch (ctrl) {
case LINE_CTRL_BAUD_RATE:
*val = sys_le32_to_cpu(dev_data->line_coding.dwDTERate);
return 0;
case LINE_CTRL_RTS:
*val =
(dev_data->line_state & CDC_CONTROL_LINE_STATE_RTS) ? 1 : 0;
return 0;
case LINE_CTRL_DTR:
*val =
(dev_data->line_state & CDC_CONTROL_LINE_STATE_DTR) ? 1 : 0;
return 0;
}
return -ENOTSUP;
}
#endif /* CONFIG_UART_LINE_CTRL */
/*
* @brief Poll the device for input.
*
* @return -ENOTSUP Since underlying USB device controller always uses
* interrupts, polled mode UART APIs are not implemented for the UART interface
* exported by CDC ACM driver. Apps should use fifo_read API instead.
*/
static int cdc_acm_poll_in(struct device *dev, unsigned char *c)
{
return -ENOTSUP;
}
/*
* @brief Output a character in polled mode.
*
* @return 0 Since it is not supported. See the comments of
* cdc_acm_poll_in() for details. Apps should use fifo_fill API instead.
*/
static unsigned char cdc_acm_poll_out(struct device *dev,
unsigned char c)
{
return 0;
}
static struct uart_driver_api cdc_acm_driver_api = {
.poll_in = cdc_acm_poll_in,
.poll_out = cdc_acm_poll_out,
.fifo_fill = cdc_acm_fifo_fill,
.fifo_read = cdc_acm_fifo_read,
.irq_tx_enable = cdc_acm_irq_tx_enable,
.irq_tx_disable = cdc_acm_irq_tx_disable,
.irq_tx_ready = cdc_acm_irq_tx_ready,
.irq_rx_enable = cdc_acm_irq_rx_enable,
.irq_rx_disable = cdc_acm_irq_rx_disable,
.irq_rx_ready = cdc_acm_irq_rx_ready,
.irq_is_pending = cdc_acm_irq_is_pending,
.irq_update = cdc_acm_irq_update,
.irq_callback_set = cdc_acm_irq_callback_set,
#ifdef CONFIG_UART_LINE_CTRL
.line_ctrl_set = cdc_acm_line_ctrl_set,
.line_ctrl_get = cdc_acm_line_ctrl_get,
#endif /* CONFIG_UART_LINE_CTRL */
};
static struct cdc_acm_dev_data_t cdc_acm_dev_data = {
.usb_status = USB_DC_UNKNOWN,
.line_coding = CDC_ACM_DEFAUL_BAUDRATE,
};
DEVICE_INIT(cdc_acm, CONFIG_CDC_ACM_PORT_NAME, &cdc_acm_init,
&cdc_acm_dev_data, NULL,
APPLICATION, CONFIG_KERNEL_INIT_PRIORITY_DEVICE);
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