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/*
* Copyright (c) 2025, sakumisu
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <nuttx/kmalloc.h>
#include <nuttx/mutex.h>
#include <nuttx/semaphore.h>
#include "usbh_core.h"
#include "usbh_cdc_acm.h"
#include <nuttx/mm/circbuf.h>
#define DEV_FORMAT "/dev/ttyACM%d"
#ifndef CONFIG_USBHOST_CDCACM_RXBUFSIZE
#define CONFIG_USBHOST_CDCACM_RXBUFSIZE 512
#endif
#ifndef CONFIG_USBHOST_CDCACM_TXBUFSIZE
#define CONFIG_USBHOST_CDCACM_TXBUFSIZE 512
#endif
struct usbhost_serial_s {
struct circbuf_s circ;
__attribute__((aligned(32))) uint8_t cache_rxbuffer[CONFIG_USBHOST_CDCACM_RXBUFSIZE];
__attribute__((aligned(32))) uint8_t cache_txbuffer[CONFIG_USBHOST_CDCACM_TXBUFSIZE];
};
static int nuttx_errorcode(int error)
{
int err = 0;
switch (error) {
case -USB_ERR_NOMEM:
err = -EIO;
break;
case -USB_ERR_INVAL:
err = -EINVAL;
break;
case -USB_ERR_NODEV:
err = -ENODEV;
break;
case -USB_ERR_NOTCONN:
err = -ENOTCONN;
break;
case -USB_ERR_NOTSUPP:
err = -EIO;
break;
case -USB_ERR_BUSY:
err = -EBUSY;
break;
case -USB_ERR_RANGE:
err = -ERANGE;
break;
case -USB_ERR_STALL:
err = -EPERM;
break;
case -USB_ERR_NAK:
err = -EAGAIN;
break;
case -USB_ERR_DT:
err = -EIO;
break;
case -USB_ERR_IO:
err = -EIO;
break;
case -USB_ERR_SHUTDOWN:
err = -ESHUTDOWN;
break;
case -USB_ERR_TIMEOUT:
err = -ETIMEDOUT;
break;
default:
break;
}
return err;
}
/* Character driver methods */
static int usbhost_open(FAR struct file *filep);
static int usbhost_close(FAR struct file *filep);
static ssize_t usbhost_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
static ssize_t usbhost_write(FAR struct file *filep,
FAR const char *buffer, size_t buflen);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct file_operations g_usbhostops = {
usbhost_open, /* open */
usbhost_close, /* close */
usbhost_read, /* read */
usbhost_write, /* write */
NULL, /* seek */
NULL, /* ioctl */
NULL, /* mmap */
NULL, /* truncate */
NULL /* poll */
};
static int usbhost_open(FAR struct file *filep)
{
struct usbh_cdc_acm *cdc_acm_class;
FAR struct inode *inode = filep->f_inode;
DEBUGASSERT(inode->i_private);
cdc_acm_class = (struct usbh_cdc_acm *)inode->i_private;
if (cdc_acm_class->hport && cdc_acm_class->hport->connected) {
return OK;
} else {
return -ENODEV;
}
}
static int usbhost_close(FAR struct file *filep)
{
FAR struct inode *inode = filep->f_inode;
DEBUGASSERT(inode->i_private);
return 0;
}
static ssize_t usbhost_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
struct usbh_cdc_acm *cdc_acm_class;
FAR struct inode *inode = filep->f_inode;
struct usbhost_serial_s *serial;
__attribute__((aligned(32))) uint8_t cache_tempbuffer[512];
int ret;
DEBUGASSERT(inode->i_private || cdc_acm_class->user_data);
cdc_acm_class = (struct usbh_cdc_acm *)inode->i_private;
serial = cdc_acm_class->user_data;
while (circbuf_used(&serial->circ) == 0) {
ret = usbh_cdc_acm_bulk_in_transfer(cdc_acm_class, cache_tempbuffer, cdc_acm_class->bulkin->wMaxPacketSize, 0xffffffff);
if (ret < 0) {
return nuttx_errorcode(ret);
}
#if defined(CONFIG_ARCH_DCACHE) && !defined(CONFIG_USB_DCACHE_ENABLE)
up_invalidate_dcache((uintptr_t)cache_tempbuffer, (uintptr_t)(cache_tempbuffer + cdc_acm_class->bulkin->wMaxPacketSize));
#endif
circbuf_overwrite(&serial->circ, cache_tempbuffer, USB_ALIGN_UP(ret, 64));
}
return circbuf_read(&serial->circ, buffer, buflen);
}
static ssize_t usbhost_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen)
{
struct usbh_cdc_acm *cdc_acm_class;
FAR struct inode *inode = filep->f_inode;
struct usbhost_serial_s *serial;
int ret;
DEBUGASSERT(inode->i_private || cdc_acm_class->user_data);
cdc_acm_class = (struct usbh_cdc_acm *)inode->i_private;
serial = cdc_acm_class->user_data;
#ifdef CONFIG_ARCH_DCACHE
uint32_t write_len = 0;
while (write_len < buflen) {
uint32_t len = buflen - write_len;
if (len > CONFIG_USBHOST_CDCACM_TXBUFSIZE) {
len = CONFIG_USBHOST_CDCACM_TXBUFSIZE;
}
memcpy(serial->cache_txbuffer, buffer + write_len, len);
#ifndef CONFIG_USB_DCACHE_ENABLE
up_clean_dcache((uintptr_t)serial->cache_txbuffer, (uintptr_t)(serial->cache_txbuffer + USB_ALIGN_UP(len, 64)));
#endif
ret = usbh_cdc_acm_bulk_out_transfer(cdc_acm_class, serial->cache_txbuffer, len, 0xffffffff);
if (ret < 0) {
return nuttx_errorcode(ret);
} else {
write_len += len;
}
}
return buflen;
#else
ret = usbh_cdc_acm_bulk_out_transfer(cdc_acm_class, (uint8_t *)buffer, buflen, 0xffffffff);
if (ret < 0) {
return nuttx_errorcode(ret);
} else {
return buflen;
}
#endif
}
void usbh_cdc_acm_run(struct usbh_cdc_acm *cdc_acm_class)
{
char devname[32];
struct usbhost_serial_s *serial;
snprintf(devname, CONFIG_USBHOST_DEV_NAMELEN, DEV_FORMAT, cdc_acm_class->minor);
serial = kmm_malloc(sizeof(struct usbhost_serial_s));
DEBUGASSERT(serial);
memset(serial, 0, sizeof(struct usbhost_serial_s));
circbuf_init(&serial->circ, serial->cache_rxbuffer, CONFIG_USBHOST_CDCACM_RXBUFSIZE);
cdc_acm_class->user_data = serial;
struct cdc_line_coding linecoding;
linecoding.dwDTERate = 115200;
linecoding.bDataBits = 8;
linecoding.bParityType = 0;
linecoding.bCharFormat = 0;
usbh_cdc_acm_set_line_coding(cdc_acm_class, &linecoding);
usbh_cdc_acm_set_line_state(cdc_acm_class, true, false);
register_driver(devname, &g_usbhostops, 0666, cdc_acm_class);
}
void usbh_cdc_acm_stop(struct usbh_cdc_acm *cdc_acm_class)
{
char devname[32];
struct usbhost_serial_s *serial;
snprintf(devname, CONFIG_USBHOST_DEV_NAMELEN, DEV_FORMAT, cdc_acm_class->minor);
unregister_driver(devname);
serial = cdc_acm_class->user_data;
kmm_free(serial);
}
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