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LibrePilot/flight/pios/stm32f4xx/pios_usb_hid.c

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/**
******************************************************************************
* @addtogroup PIOS PIOS Core hardware abstraction layer
* @{
* @addtogroup PIOS_USB_HID USB COM Functions
* @brief PIOS USB COM implementation for HID interfaces
* @notes This implements serial emulation over HID reports
* @{
*
* @file pios_usb_hid.c
* @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2010.
* @brief USB COM functions (STM32 dependent code)
* @see The GNU Public License (GPL) Version 3
*
*****************************************************************************/
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <pios.h>
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#ifdef PIOS_INCLUDE_USB_HID
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#include <pios_usb_hid_priv.h>
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#include "pios_usb_board_data.h" /* PIOS_BOARD_*_DATA_LENGTH */
#include <pios_usbhook.h> /* PIOS_USBHOOK_* */
#include <pios_delay.h>
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static void PIOS_USB_HID_RegisterTxCallback(uint32_t usbhid_id, pios_com_callback tx_out_cb, uint32_t context);
static void PIOS_USB_HID_RegisterRxCallback(uint32_t usbhid_id, pios_com_callback rx_in_cb, uint32_t context);
static void PIOS_USB_HID_TxStart(uint32_t usbhid_id, uint16_t tx_bytes_avail);
static void PIOS_USB_HID_RxStart(uint32_t usbhid_id, uint16_t rx_bytes_avail);
static uint32_t PIOS_USB_HID_Available(uint32_t usbhid_id);
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const struct pios_com_driver pios_usb_hid_com_driver = {
.tx_start = PIOS_USB_HID_TxStart,
.rx_start = PIOS_USB_HID_RxStart,
.bind_tx_cb = PIOS_USB_HID_RegisterTxCallback,
.bind_rx_cb = PIOS_USB_HID_RegisterRxCallback,
.available = PIOS_USB_HID_Available,
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};
enum pios_usb_hid_dev_magic {
PIOS_USB_HID_DEV_MAGIC = 0xAA00BB00,
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};
struct pios_usb_hid_dev {
enum pios_usb_hid_dev_magic magic;
const struct pios_usb_hid_cfg *cfg;
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uint32_t lower_id;
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pios_com_callback rx_in_cb;
uint32_t rx_in_context;
pios_com_callback tx_out_cb;
uint32_t tx_out_context;
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bool usb_if_enabled;
uint8_t rx_packet_buffer[PIOS_USB_BOARD_HID_DATA_LENGTH] __attribute__((aligned(4)));
volatile bool rx_active;
uint8_t tx_packet_buffer[PIOS_USB_BOARD_HID_DATA_LENGTH] __attribute__((aligned(4)));
volatile bool tx_active;
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uint32_t rx_dropped;
uint32_t rx_oversize;
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};
static bool PIOS_USB_HID_validate(struct pios_usb_hid_dev *usb_hid_dev)
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{
return usb_hid_dev && (usb_hid_dev->magic == PIOS_USB_HID_DEV_MAGIC);
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}
#if defined(PIOS_INCLUDE_FREERTOS)
static struct pios_usb_hid_dev *PIOS_USB_HID_alloc(void)
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{
struct pios_usb_hid_dev *usb_hid_dev;
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usb_hid_dev = (struct pios_usb_hid_dev *)pios_malloc(sizeof(struct pios_usb_hid_dev));
if (!usb_hid_dev) {
return NULL;
}
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memset(usb_hid_dev, 0, sizeof(struct pios_usb_hid_dev));
usb_hid_dev->magic = PIOS_USB_HID_DEV_MAGIC;
return usb_hid_dev;
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}
#else
static struct pios_usb_hid_dev pios_usb_hid_devs[PIOS_USB_HID_MAX_DEVS];
static uint8_t pios_usb_hid_num_devs;
static struct pios_usb_hid_dev *PIOS_USB_HID_alloc(void)
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{
struct pios_usb_hid_dev *usb_hid_dev;
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if (pios_usb_hid_num_devs >= PIOS_USB_HID_MAX_DEVS) {
return NULL;
}
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usb_hid_dev = &pios_usb_hid_devs[pios_usb_hid_num_devs++];
memset(usb_hid_dev, 0, sizeof(struct pios_usb_hid_dev));
usb_hid_dev->magic = PIOS_USB_HID_DEV_MAGIC;
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return usb_hid_dev;
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}
#endif /* if defined(PIOS_INCLUDE_FREERTOS) */
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static void PIOS_USB_HID_IF_Init(uint32_t usb_hid_id);
static void PIOS_USB_HID_IF_DeInit(uint32_t usb_hid_id);
static bool PIOS_USB_HID_IF_Setup(uint32_t usb_hid_id, struct usb_setup_request *req);
static void PIOS_USB_HID_IF_CtrlDataOut(uint32_t usb_hid_id, const struct usb_setup_request *req);
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static struct pios_usb_ifops usb_hid_ifops = {
.init = PIOS_USB_HID_IF_Init,
.deinit = PIOS_USB_HID_IF_DeInit,
.setup = PIOS_USB_HID_IF_Setup,
.ctrl_data_out = PIOS_USB_HID_IF_CtrlDataOut,
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};
static bool PIOS_USB_HID_EP_IN_Callback(uint32_t usb_hid_id, uint8_t epnum, uint16_t len);
static bool PIOS_USB_HID_EP_OUT_Callback(uint32_t usb_hid_id, uint8_t epnum, uint16_t len);
int32_t PIOS_USB_HID_Init(uint32_t *usbhid_id, const struct pios_usb_hid_cfg *cfg, uint32_t lower_id)
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{
PIOS_Assert(usbhid_id);
PIOS_Assert(cfg);
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struct pios_usb_hid_dev *usb_hid_dev;
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usb_hid_dev = (struct pios_usb_hid_dev *)PIOS_USB_HID_alloc();
if (!usb_hid_dev) {
goto out_fail;
}
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/* Bind the configuration to the device instance */
usb_hid_dev->cfg = cfg;
usb_hid_dev->lower_id = lower_id;
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/* Rx and Tx are not active yet */
usb_hid_dev->rx_active = false;
usb_hid_dev->tx_active = false;
/* Register class specific interface callbacks with the USBHOOK layer */
usb_hid_dev->usb_if_enabled = false;
PIOS_USBHOOK_RegisterIfOps(cfg->data_if, &usb_hid_ifops, (uint32_t)usb_hid_dev);
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*usbhid_id = (uint32_t)usb_hid_dev;
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return 0;
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out_fail:
return -1;
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}
static struct pios_usbhook_descriptor hid_desc;
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void PIOS_USB_HID_RegisterHidDescriptor(const uint8_t *desc, uint16_t length)
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{
hid_desc.descriptor = desc;
hid_desc.length = length;
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}
static struct pios_usbhook_descriptor hid_report_desc;
void PIOS_USB_HID_RegisterHidReport(const uint8_t *desc, uint16_t length)
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{
hid_report_desc.descriptor = desc;
hid_report_desc.length = length;
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}
static bool PIOS_USB_HID_SendReport(struct pios_usb_hid_dev *usb_hid_dev)
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{
uint16_t bytes_to_tx;
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if (!usb_hid_dev->tx_out_cb) {
return false;
}
READ_MEMORY_BARRIER();
bool need_yield = false;
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#ifdef PIOS_USB_BOARD_BL_HID_HAS_NO_LENGTH_BYTE
bytes_to_tx = (usb_hid_dev->tx_out_cb)(usb_hid_dev->tx_out_context,
&usb_hid_dev->tx_packet_buffer[1],
sizeof(usb_hid_dev->tx_packet_buffer) - 1,
NULL,
&need_yield);
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#else
bytes_to_tx = (usb_hid_dev->tx_out_cb)(usb_hid_dev->tx_out_context,
&usb_hid_dev->tx_packet_buffer[2],
sizeof(usb_hid_dev->tx_packet_buffer) - 2,
NULL,
&need_yield);
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#endif
if (bytes_to_tx == 0) {
return false;
}
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/*
* Mark this endpoint as being tx active _before_ actually transmitting
* to make sure we don't race with the Tx completion interrupt
*/
usb_hid_dev->tx_active = true;
/* Always set type as report ID */
usb_hid_dev->tx_packet_buffer[0] = 1;
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#ifdef PIOS_USB_BOARD_BL_HID_HAS_NO_LENGTH_BYTE
PIOS_USBHOOK_EndpointTx(usb_hid_dev->cfg->data_tx_ep,
usb_hid_dev->tx_packet_buffer,
sizeof(usb_hid_dev->tx_packet_buffer));
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#else
usb_hid_dev->tx_packet_buffer[1] = bytes_to_tx;
PIOS_USBHOOK_EndpointTx(usb_hid_dev->cfg->data_tx_ep,
usb_hid_dev->tx_packet_buffer,
sizeof(usb_hid_dev->tx_packet_buffer));
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#endif
#if defined(PIOS_INCLUDE_FREERTOS)
if (need_yield) {
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vPortYield();
}
#endif /* PIOS_INCLUDE_FREERTOS */
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return true;
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}
static void PIOS_USB_HID_RxStart(uint32_t usbhid_id, uint16_t rx_bytes_avail)
{
struct pios_usb_hid_dev *usb_hid_dev = (struct pios_usb_hid_dev *)usbhid_id;
bool valid = PIOS_USB_HID_validate(usb_hid_dev);
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PIOS_Assert(valid);
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/* Make sure this USB interface has been initialized */
if (!usb_hid_dev->usb_if_enabled) {
return;
}
if (!PIOS_USB_CheckAvailable(usb_hid_dev->lower_id)) {
return;
}
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// If endpoint was stalled and there is now space make it valid
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#ifdef PIOS_USB_BOARD_BL_HID_HAS_NO_LENGTH_BYTE
uint16_t max_payload_length = PIOS_USB_BOARD_HID_DATA_LENGTH - 1;
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#else
uint16_t max_payload_length = PIOS_USB_BOARD_HID_DATA_LENGTH - 2;
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#endif
if (!usb_hid_dev->rx_active && (rx_bytes_avail >= max_payload_length)) {
PIOS_USBHOOK_EndpointRx(usb_hid_dev->cfg->data_rx_ep,
usb_hid_dev->rx_packet_buffer,
sizeof(usb_hid_dev->rx_packet_buffer));
usb_hid_dev->rx_active = true;
}
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}
static void PIOS_USB_HID_TxStart(uint32_t usbhid_id, __attribute__((unused)) uint16_t tx_bytes_avail)
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{
struct pios_usb_hid_dev *usb_hid_dev = (struct pios_usb_hid_dev *)usbhid_id;
bool valid = PIOS_USB_HID_validate(usb_hid_dev);
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PIOS_Assert(valid);
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/* Make sure this USB interface has been initialized */
if (!usb_hid_dev->usb_if_enabled) {
return;
}
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if (!PIOS_USB_CheckAvailable(usb_hid_dev->lower_id)) {
return;
}
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if (!usb_hid_dev->tx_active) {
/* Transmitter is not currently active, send a report */
PIOS_USB_HID_SendReport(usb_hid_dev);
}
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}
static void PIOS_USB_HID_RegisterRxCallback(uint32_t usbhid_id, pios_com_callback rx_in_cb, uint32_t context)
{
struct pios_usb_hid_dev *usb_hid_dev = (struct pios_usb_hid_dev *)usbhid_id;
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bool valid = PIOS_USB_HID_validate(usb_hid_dev);
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PIOS_Assert(valid);
/*
* Order is important in these assignments since ISR uses _cb
* field to determine if it's ok to dereference _cb and _context
*/
usb_hid_dev->rx_in_context = context;
WRITE_MEMORY_BARRIER();
usb_hid_dev->rx_in_cb = rx_in_cb;
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}
static void PIOS_USB_HID_RegisterTxCallback(uint32_t usbhid_id, pios_com_callback tx_out_cb, uint32_t context)
{
struct pios_usb_hid_dev *usb_hid_dev = (struct pios_usb_hid_dev *)usbhid_id;
bool valid = PIOS_USB_HID_validate(usb_hid_dev);
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PIOS_Assert(valid);
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/*
* Order is important in these assignments since ISR uses _cb
* field to determine if it's ok to dereference _cb and _context
*/
usb_hid_dev->tx_out_context = context;
WRITE_MEMORY_BARRIER();
usb_hid_dev->tx_out_cb = tx_out_cb;
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}
static void PIOS_USB_HID_IF_Init(uint32_t usb_hid_id)
{
struct pios_usb_hid_dev *usb_hid_dev = (struct pios_usb_hid_dev *)usb_hid_id;
if (!PIOS_USB_HID_validate(usb_hid_dev)) {
return;
}
/* Register endpoint specific callbacks with the USBHOOK layer */
PIOS_USBHOOK_RegisterEpInCallback(usb_hid_dev->cfg->data_tx_ep,
sizeof(usb_hid_dev->tx_packet_buffer),
PIOS_USB_HID_EP_IN_Callback,
(uint32_t)usb_hid_dev);
PIOS_USBHOOK_RegisterEpOutCallback(usb_hid_dev->cfg->data_rx_ep,
sizeof(usb_hid_dev->rx_packet_buffer),
PIOS_USB_HID_EP_OUT_Callback,
(uint32_t)usb_hid_dev);
usb_hid_dev->usb_if_enabled = true;
usb_hid_dev->tx_active = false;
usb_hid_dev->rx_active = false;
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}
static void PIOS_USB_HID_IF_DeInit(uint32_t usb_hid_id)
{
struct pios_usb_hid_dev *usb_hid_dev = (struct pios_usb_hid_dev *)usb_hid_id;
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if (!PIOS_USB_HID_validate(usb_hid_dev)) {
return;
}
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/* DeRegister endpoint specific callbacks with the USBHOOK layer */
usb_hid_dev->usb_if_enabled = false;
usb_hid_dev->tx_active = false;
usb_hid_dev->rx_active = false;
PIOS_USBHOOK_DeRegisterEpInCallback(usb_hid_dev->cfg->data_tx_ep);
PIOS_USBHOOK_DeRegisterEpOutCallback(usb_hid_dev->cfg->data_rx_ep);
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}
static uint8_t hid_protocol;
static uint8_t hid_altset;
struct hid_idle_msg {
uint8_t idle_period;
uint8_t report_id;
};
static struct hid_idle_msg hid_idle;
static uint8_t dummy_report[2];
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static bool PIOS_USB_HID_IF_Setup(uint32_t usb_hid_id, struct usb_setup_request *req)
{
struct pios_usb_hid_dev *usb_hid_dev = (struct pios_usb_hid_dev *)usb_hid_id;
if (!PIOS_USB_HID_validate(usb_hid_dev)) {
return false;
}
/* Make sure this is a request for an interface we know about */
uint8_t ifnum = req->wIndex & 0xFF;
if (ifnum != usb_hid_dev->cfg->data_if) {
return false;
}
switch (req->bmRequestType & (USB_REQ_TYPE_MASK | USB_REQ_RECIPIENT_MASK)) {
case (USB_REQ_TYPE_STANDARD | USB_REQ_RECIPIENT_INTERFACE):
switch (req->bRequest) {
case USB_REQ_GET_DESCRIPTOR:
switch (req->wValue >> 8) {
case USB_DESC_TYPE_REPORT:
PIOS_USBHOOK_CtrlTx(hid_report_desc.descriptor,
MIN(hid_report_desc.length, req->wLength));
break;
case USB_DESC_TYPE_HID:
PIOS_USBHOOK_CtrlTx(hid_desc.descriptor,
MIN(hid_desc.length, req->wLength));
break;
default:
/* Unhandled descriptor request */
return false;
break;
}
break;
case USB_REQ_GET_INTERFACE:
PIOS_USBHOOK_CtrlTx(&hid_altset, 1);
break;
case USB_REQ_SET_INTERFACE:
hid_altset = (uint8_t)(req->wValue);
break;
default:
/* Unhandled standard request */
return false;
break;
}
break;
case (USB_REQ_TYPE_CLASS | USB_REQ_RECIPIENT_INTERFACE):
switch (req->bRequest) {
case USB_HID_REQ_SET_PROTOCOL:
hid_protocol = (uint8_t)(req->wValue);
break;
case USB_HID_REQ_SET_IDLE:
/* Idle rates are currently ignored but decoded for debugging */
hid_idle.idle_period = req->wValue & 0xFF00 >> 8;
hid_idle.report_id = req->wValue & 0x00FF;
break;
case USB_HID_REQ_GET_PROTOCOL:
PIOS_USBHOOK_CtrlTx(&hid_protocol, 1);
break;
case USB_HID_REQ_GET_REPORT:
/* Give back a dummy input report */
dummy_report[0] = req->wValue & 0xFF; /* Report ID */
dummy_report[1] = 0x00; /* dummy value */
PIOS_USBHOOK_CtrlTx(dummy_report,
MIN(sizeof(dummy_report), req->wLength));
break;
default:
/* Unhandled class request */
return false;
break;
}
break;
default:
/* Unhandled request */
return false;
}
return true;
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}
static void PIOS_USB_HID_IF_CtrlDataOut(__attribute__((unused)) uint32_t usb_hid_id, __attribute__((unused)) const struct usb_setup_request *req)
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{
/* HID devices don't have any OUT data stages on the control endpoint */
PIOS_Assert(0);
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}
/**
* @brief Callback used to indicate a transmission from device INto host completed
* Checks if any data remains, pads it into HID packet and sends.
*/
static bool PIOS_USB_HID_EP_IN_Callback(uint32_t usb_hid_id, __attribute__((unused)) uint8_t epnum, __attribute__((unused)) uint16_t len)
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{
struct pios_usb_hid_dev *usb_hid_dev = (struct pios_usb_hid_dev *)usb_hid_id;
if (!PIOS_USB_HID_validate(usb_hid_dev)) {
return false;
}
if (PIOS_USB_CheckAvailable(usb_hid_dev->lower_id) &&
PIOS_USB_HID_SendReport(usb_hid_dev)) {
/* More data has been queued, leave tx_active set to true */
return true;
} else {
/* Nothing new sent, transmitter is now inactive */
usb_hid_dev->tx_active = false;
return false;
}
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}
/**
* EP1 OUT Callback Routine
*/
static bool PIOS_USB_HID_EP_OUT_Callback(uint32_t usb_hid_id, __attribute__((unused)) uint8_t epnum, uint16_t len)
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{
struct pios_usb_hid_dev *usb_hid_dev = (struct pios_usb_hid_dev *)usb_hid_id;
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if (!PIOS_USB_HID_validate(usb_hid_dev)) {
return false;
}
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if (len > sizeof(usb_hid_dev->rx_packet_buffer)) {
len = sizeof(usb_hid_dev->rx_packet_buffer);
}
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if (!usb_hid_dev->rx_in_cb) {
/* No Rx call back registered, disable the receiver */
usb_hid_dev->rx_active = false;
return false;
}
READ_MEMORY_BARRIER();
/* The first byte is report ID (not checked), the second byte is the valid data length */
uint16_t headroom;
bool need_yield = false;
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#ifdef PIOS_USB_BOARD_BL_HID_HAS_NO_LENGTH_BYTE
(usb_hid_dev->rx_in_cb)(usb_hid_dev->rx_in_context,
&usb_hid_dev->rx_packet_buffer[1],
len - 1,
&headroom,
&need_yield);
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#else
(usb_hid_dev->rx_in_cb)(usb_hid_dev->rx_in_context,
&usb_hid_dev->rx_packet_buffer[2],
usb_hid_dev->rx_packet_buffer[1],
&headroom,
&need_yield);
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#endif
#ifdef PIOS_USB_BOARD_BL_HID_HAS_NO_LENGTH_BYTE
uint16_t max_payload_length = PIOS_USB_BOARD_HID_DATA_LENGTH - 1;
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#else
uint16_t max_payload_length = PIOS_USB_BOARD_HID_DATA_LENGTH - 2;
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#endif
bool rc;
if (headroom >= max_payload_length) {
/* We have room for a maximum length message */
PIOS_USBHOOK_EndpointRx(usb_hid_dev->cfg->data_rx_ep,
usb_hid_dev->rx_packet_buffer,
sizeof(usb_hid_dev->rx_packet_buffer));
rc = true;
} else {
/* Not enough room left for a message, apply backpressure */
usb_hid_dev->rx_active = false;
rc = false;
}
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#if defined(PIOS_INCLUDE_FREERTOS)
if (need_yield) {
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vPortYield();
}
#endif /* PIOS_INCLUDE_FREERTOS */
return rc;
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}
static uint32_t PIOS_USB_HID_Available(uint32_t usbhid_id)
{
return PIOS_USB_CheckAvailable(usbhid_id) ? COM_AVAILABLE_RXTX : COM_AVAILABLE_NONE;
}
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#endif /* PIOS_INCLUDE_USB_HID */