pios_usb.c

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/*
 * 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, see <http://www.gnu.org/licenses/>
 */

/* Project Includes */
#include "pios.h"
#include "usb_lib.h"
#include "pios_usb_board_data.h"
#include "stm32f10x.h"

#include "pios_usb.h"
#include "pios_usb_priv.h"

#if defined(PIOS_INCLUDE_USB_HID)

/* Rx/Tx status */
static bool transfer_possible = false;

/* USB activity detection */
static volatile bool sof_seen_since_reset = false;

enum pios_usb_dev_magic {
        PIOS_USB_DEV_MAGIC = 0x17365904,
};

struct pios_usb_dev {
        enum pios_usb_dev_magic     magic;
        const struct pios_usb_cfg * cfg;
};

static int32_t PIOS_USB_validate(struct pios_usb_dev * usb_dev)
{
        if(usb_dev == NULL)
                return -1;

        if (usb_dev->magic != PIOS_USB_DEV_MAGIC)
                return -1;

        return 0;
}

static struct pios_usb_dev * PIOS_USB_alloc(void)
{
        struct pios_usb_dev * usb_dev;

        usb_dev = (struct pios_usb_dev *)PIOS_malloc(sizeof(*usb_dev));
        if (!usb_dev) return(NULL);

        usb_dev->magic = PIOS_USB_DEV_MAGIC;
        return(usb_dev);
}

static uintptr_t pios_usb_com_id;
int32_t PIOS_USB_Init(uintptr_t * usb_id, const struct pios_usb_cfg * cfg)
{
        PIOS_Assert(usb_id);
        PIOS_Assert(cfg);

        struct pios_usb_dev * usb_dev;

        usb_dev = (struct pios_usb_dev *) PIOS_USB_alloc();
        if (!usb_dev) goto out_fail;

        /* Bind the configuration to the device instance */
        usb_dev->cfg = cfg;

        PIOS_USB_Reenumerate();

        /*
         * This is a horrible hack to make this available to
         * the interrupt callbacks.  This should go away ASAP.
         */
        pios_usb_com_id = (uintptr_t) usb_dev;

        /* Enable the USB Interrupts */
        NVIC_Init((NVIC_InitTypeDef*)&usb_dev->cfg->irq.init);

        /* Select USBCLK source */
        RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_1Div5);
        /* Enable the USB clock */
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_USB, ENABLE);

        USB_Init();
        USB_SIL_Init();

        *usb_id = (uintptr_t) usb_dev;

        return 0;               /* No error */

out_fail:
        return(-1);
}

int32_t PIOS_USB_ChangeConnectionState(bool Connected)
{
        // In all cases: re-initialise USB HID driver
        if (Connected) {
                transfer_possible = true;

                //TODO: Check SetEPRxValid(ENDP1);

#if defined(USB_LED_ON)
                USB_LED_ON;     // turn the USB led on
#endif
        } else {
                // Cable disconnected: disable transfers
                transfer_possible = false;

#if defined(USB_LED_OFF)
                USB_LED_OFF;    // turn the USB led off
#endif
        }

        return 0;
}

int32_t PIOS_USB_Reenumerate()
{
        /* Force USB reset and power-down (this will also release the USB pins for direct GPIO control) */
        _SetCNTR(CNTR_FRES | CNTR_PDWN);

        /* Using a "dirty" method to force a re-enumeration: */
        /* Force DPM (Pin PA12) low for ca. 10 mS before USB Tranceiver will be enabled */
        /* This overrules the external Pull-Up at PA12, and at least Windows & MacOS will enumerate again */
        GPIO_InitTypeDef GPIO_InitStructure;
        GPIO_StructInit(&GPIO_InitStructure);
        GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12;
        GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
        GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
        GPIO_Init(GPIOA, &GPIO_InitStructure);

        PIOS_DELAY_WaitmS(50);

        /* Release power-down, still hold reset */
        _SetCNTR(CNTR_PDWN);
        PIOS_DELAY_WaituS(5);

        /* CNTR_FRES = 0 */
        _SetCNTR(0);

        /* Clear pending interrupts */
        _SetISTR(0);

        /* Configure USB clock */
        /* USBCLK = PLLCLK / 1.5 */
        RCC_USBCLKConfig(RCC_USBCLKSource_PLLCLK_1Div5);
        /* Enable USB clock */
        RCC_APB1PeriphClockCmd(RCC_APB1Periph_USB, ENABLE);

        return 0;
}

bool PIOS_USB_CableConnected(uintptr_t id)
{
        struct pios_usb_dev * usb_dev = (struct pios_usb_dev *) pios_usb_com_id;

        if (PIOS_USB_validate(usb_dev) != 0)
                return false;

        if (usb_dev->cfg->vsense.gpio != NULL)
                return GPIO_ReadInputDataBit(usb_dev->cfg->vsense.gpio, usb_dev->cfg->vsense.init.GPIO_Pin) == Bit_SET;

        return sof_seen_since_reset;
}

bool PIOS_USB_HaveVSense(uintptr_t id)
{
        struct pios_usb_dev * usb_dev = (struct pios_usb_dev *) pios_usb_com_id;

        if (PIOS_USB_validate(usb_dev) != 0)
                return false;

        return usb_dev->cfg->vsense.gpio != NULL;
}

bool PIOS_USB_CheckAvailable(uintptr_t id)
{
        struct pios_usb_dev * usb_dev = (struct pios_usb_dev *) pios_usb_com_id;

        if (PIOS_USB_validate(usb_dev) != 0)
                return false;

        return PIOS_USB_CableConnected(id) && transfer_possible;
}

void SOF_Callback(void)
{
        sof_seen_since_reset = true;
}

void SUSP_Callback(void)
{
        sof_seen_since_reset = false;
}

#endif