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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 <fcntl.h>
#include "usbd_core.h"
#include "usbd_cdc_acm.h"
#include <nuttx/mm/circbuf.h>
#ifndef CONFIG_USBDEV_CDCACM_RXBUFSIZE
#define CONFIG_USBDEV_CDCACM_RXBUFSIZE 512
#endif
#ifndef CONFIG_USBDEV_CDCACM_TXBUFSIZE
#define CONFIG_USBDEV_CDCACM_TXBUFSIZE 512
#endif
USB_NOCACHE_RAM_SECTION struct usbdev_serial_s {
char name[16];
struct circbuf_s circ;
uint8_t inep;
uint8_t outep;
struct usbd_interface ctrl_intf;
struct usbd_interface data_intf;
__attribute__((aligned(32))) uint8_t cache_tempbuffer[512];
__attribute__((aligned(32))) uint8_t cache_rxbuffer[CONFIG_USBDEV_CDCACM_RXBUFSIZE];
__attribute__((aligned(32))) uint8_t cache_txbuffer[CONFIG_USBDEV_CDCACM_TXBUFSIZE];
};
struct usbdev_serial_ep_s {
uint32_t rxlen;
int error;
sem_t txdone_sem;
sem_t rxdone_sem;
bool used;
};
struct usbdev_serial_s *g_usb_cdcacm_serial[8] = { 0 };
struct usbdev_serial_ep_s g_usb_cdcacm_serial_ep[2][8] = { 0 };
void usbd_cdc_acm_bulk_out(uint8_t busid, uint8_t ep, uint32_t nbytes)
{
g_usb_cdcacm_serial_ep[0][ep & 0x0f].error = 0;
g_usb_cdcacm_serial_ep[0][ep & 0x0f].rxlen = nbytes;
nxsem_post(&g_usb_cdcacm_serial_ep[0][ep & 0x0f].rxdone_sem);
}
void usbd_cdc_acm_bulk_in(uint8_t busid, uint8_t ep, uint32_t nbytes)
{
if ((nbytes % usbd_get_ep_mps(busid, ep)) == 0 && nbytes) {
/* send zlp */
usbd_ep_start_write(busid, ep, NULL, 0);
} else {
nxsem_post(&g_usb_cdcacm_serial_ep[1][ep & 0x0f].txdone_sem);
}
}
/* Character driver methods */
static int usbdev_open(FAR struct file *filep);
static int usbdev_close(FAR struct file *filep);
static ssize_t usbdev_read(FAR struct file *filep, FAR char *buffer,
size_t buflen);
static ssize_t usbdev_write(FAR struct file *filep,
FAR const char *buffer, size_t buflen);
/****************************************************************************
* Private Data
****************************************************************************/
static const struct file_operations g_usbdevops = {
usbdev_open, /* open */
usbdev_close, /* close */
usbdev_read, /* read */
usbdev_write, /* write */
NULL, /* seek */
NULL, /* ioctl */
NULL, /* mmap */
NULL, /* truncate */
NULL /* poll */
};
static int usbdev_open(FAR struct file *filep)
{
FAR struct inode *inode = filep->f_inode;
DEBUGASSERT(inode->i_private);
if (usb_device_is_configured(0)) {
return OK;
} else {
return -ENODEV;
}
}
static int usbdev_close(FAR struct file *filep)
{
FAR struct inode *inode = filep->f_inode;
DEBUGASSERT(inode->i_private);
if (!usb_device_is_configured(0)) {
return -ENODEV;
}
return 0;
}
static ssize_t usbdev_read(FAR struct file *filep, FAR char *buffer,
size_t buflen)
{
FAR struct inode *inode = filep->f_inode;
struct usbdev_serial_s *serial;
int ret;
DEBUGASSERT(inode->i_private);
serial = (struct usbdev_serial_s *)inode->i_private;
if (!usb_device_is_configured(0)) {
return -ENODEV;
}
while (circbuf_used(&serial->circ) == 0) {
nxsem_reset(&g_usb_cdcacm_serial_ep[0][serial->outep & 0x0f].rxdone_sem, 0);
usbd_ep_start_read(0, serial->outep, serial->cache_tempbuffer, usbd_get_ep_mps(0, serial->outep));
ret = nxsem_wait(&g_usb_cdcacm_serial_ep[0][serial->outep & 0x0f].rxdone_sem);
if (ret < 0) {
return ret;
}
if (g_usb_cdcacm_serial_ep[0][serial->outep & 0x0f].error < 0) {
return g_usb_cdcacm_serial_ep[0][serial->outep & 0x0f].error;
}
#if defined(CONFIG_ARCH_DCACHE) && !defined(CONFIG_USB_DCACHE_ENABLE)
up_invalidate_dcache((uintptr_t)serial->cache_tempbuffer, (uintptr_t)(serial->cache_tempbuffer + USB_ALIGN_UP(g_usb_cdcacm_serial_ep[0][serial->outep & 0x0f].rxlen, 64)));
#endif
circbuf_overwrite(&serial->circ, serial->cache_tempbuffer, g_usb_cdcacm_serial_ep[0][serial->outep & 0x0f].rxlen);
}
return circbuf_read(&serial->circ, buffer, buflen);
}
static ssize_t usbdev_write(FAR struct file *filep, FAR const char *buffer,
size_t buflen)
{
FAR struct inode *inode = filep->f_inode;
struct usbdev_serial_s *serial;
int ret;
DEBUGASSERT(inode->i_private);
serial = (struct usbdev_serial_s *)inode->i_private;
if (!usb_device_is_configured(0)) {
return -ENODEV;
}
#ifdef CONFIG_ARCH_DCACHE
uint32_t write_len = 0;
while (write_len < buflen) {
uint32_t len = buflen - write_len;
if (len > CONFIG_USBDEV_CDCACM_TXBUFSIZE) {
len = CONFIG_USBDEV_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
nxsem_reset(&g_usb_cdcacm_serial_ep[0][serial->inep & 0x0f].txdone_sem, 0);
usbd_ep_start_write(0, serial->inep, serial->cache_txbuffer, len);
ret = nxsem_wait(&g_usb_cdcacm_serial_ep[0][serial->inep & 0x0f].txdone_sem);
if (ret < 0) {
return ret;
} else {
if (g_usb_cdcacm_serial_ep[1][serial->inep & 0x0f].error < 0) {
return g_usb_cdcacm_serial_ep[1][serial->inep & 0x0f].error;
}
write_len += len;
}
}
return buflen;
#else
nxsem_reset(&g_usb_cdcacm_serial_ep[0][outep & 0x0f].txdone_sem, 0);
usbd_ep_start_write(0, serial->inep, buffer, buflen);
ret = nxsem_wait(&g_usb_cdcacm_serial_ep[0][outep & 0x0f].txdone_sem);
if (ret < 0) {
return ret;
} else {
if (g_usb_cdcacm_serial_ep[1][serial->inep & 0x0f].error < 0) {
return g_usb_cdcacm_serial_ep[1][serial->inep & 0x0f].error;
}
return buflen;
}
#endif
}
static struct usbd_endpoint cdc_out_ep[8] = { 0 };
static struct usbd_endpoint cdc_in_ep[8] = { 0 };
static void cdcacm_notify_handler(uint8_t busid, uint8_t event, void *arg)
{
switch (event) {
case USBD_EVENT_RESET:
break;
case USBD_EVENT_DISCONNECTED:
for (size_t i = 0; i < 8; i++) {
if (g_usb_cdcacm_serial_ep[0][i & 0x0f].used) {
g_usb_cdcacm_serial_ep[0][i & 0x0f].error = -ESHUTDOWN;
nxsem_post(&g_usb_cdcacm_serial_ep[0][i & 0x0f].rxdone_sem);
}
if (g_usb_cdcacm_serial_ep[1][i & 0x0f].used) {
g_usb_cdcacm_serial_ep[1][i & 0x0f].error = -ESHUTDOWN;
nxsem_post(&g_usb_cdcacm_serial_ep[1][i & 0x0f].txdone_sem);
}
}
break;
case USBD_EVENT_CONFIGURED:
for (size_t i = 0; i < 8; i++) {
if (g_usb_cdcacm_serial_ep[0][i & 0x0f].used) {
g_usb_cdcacm_serial_ep[0][i & 0x0f].error = 0;
nxsem_post(&g_usb_cdcacm_serial_ep[0][i & 0x0f].rxdone_sem);
}
if (g_usb_cdcacm_serial_ep[1][i & 0x0f].used) {
g_usb_cdcacm_serial_ep[1][i & 0x0f].error = 0;
nxsem_post(&g_usb_cdcacm_serial_ep[1][i & 0x0f].txdone_sem);
}
}
break;
default:
break;
}
}
void usbd_cdcacm_init(uint8_t busid, uint8_t id, const char *path, uint8_t outep, uint8_t inep)
{
g_usb_cdcacm_serial[id] = kmm_malloc(sizeof(struct usbdev_serial_s));
DEBUGASSERT(g_usb_cdcacm_serial[id]);
memset(g_usb_cdcacm_serial[id], 0, sizeof(struct usbdev_serial_s));
strncpy(g_usb_cdcacm_serial[id]->name, path, sizeof(g_usb_cdcacm_serial[id]->name) - 1);
circbuf_init(&g_usb_cdcacm_serial[id]->circ, g_usb_cdcacm_serial[id]->cache_rxbuffer, CONFIG_USBDEV_CDCACM_RXBUFSIZE);
nxsem_init(&g_usb_cdcacm_serial_ep[0][outep & 0x0f].rxdone_sem, 0, 0);
nxsem_init(&g_usb_cdcacm_serial_ep[1][inep & 0x0f].txdone_sem, 0, 0);
g_usb_cdcacm_serial_ep[0][outep & 0x0f].used = true;
g_usb_cdcacm_serial_ep[1][inep & 0x0f].used = true;
usbd_add_interface(busid, usbd_cdc_acm_init_intf(busid, &g_usb_cdcacm_serial[id]->ctrl_intf));
usbd_add_interface(busid, usbd_cdc_acm_init_intf(busid, &g_usb_cdcacm_serial[id]->data_intf));
g_usb_cdcacm_serial[id]->ctrl_intf.notify_handler = cdcacm_notify_handler;
g_usb_cdcacm_serial[id]->outep = outep;
g_usb_cdcacm_serial[id]->inep = inep;
cdc_out_ep[id].ep_addr = outep;
cdc_out_ep[id].ep_cb = usbd_cdc_acm_bulk_out;
cdc_in_ep[id].ep_addr = inep;
cdc_in_ep[id].ep_cb = usbd_cdc_acm_bulk_in;
usbd_add_endpoint(busid, &cdc_out_ep[id]);
usbd_add_endpoint(busid, &cdc_in_ep[id]);
register_driver(path, &g_usbdevops, 0666, g_usb_cdcacm_serial[id]);
}
void usbd_cdcacm_deinit(uint8_t busid, uint8_t id)
{
unregister_driver(g_usb_cdcacm_serial[id]->name);
kmm_free(g_usb_cdcacm_serial[id]);
}
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