/*
    ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio

    Licensed under the Apache License, Version 2.0 (the "License");
    you may not use this file except in compliance with the License.
    You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing, software
    distributed under the License is distributed on an "AS IS" BASIS,
    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    See the License for the specific language governing permissions and
    limitations under the License.
*/

#include "ch.h"
#include "hal.h"
#include "test.h"

#include "usb_msc.h"

/*===========================================================================*/
/* USB related stuff.                                                        */
/*===========================================================================*/

/*
 * USB Device Descriptor.
 */
static const uint8_t msc_device_descriptor_data[18] = {
  USB_DESC_DEVICE       (0x0110,        /* bcdUSB (1.1).                    */
                         0x00,          /* bDeviceClass (in interface).     */
                         0x00,          /* bDeviceSubClass.                 */
                         0x00,          /* bDeviceProtocol.                 */
                         0x40,          /* bMaxPacketSize.                  */
                         0x0483,        /* idVendor (ST).                   */
                         0x2004,        /* idProduct.                       */
                         0x0200,        /* bcdDevice.                       */
                         1,             /* iManufacturer.                   */
                         2,             /* iProduct.                        */
                         3,             /* iSerialNumber.                   */
                         1)             /* bNumConfigurations.              */
};

/*
 * Device Descriptor wrapper.
 */
static const USBDescriptor msc_device_descriptor = {
  sizeof msc_device_descriptor_data,
  msc_device_descriptor_data
};

/* Configuration Descriptor tree for a CDC.*/
static const uint8_t msc_configuration_descriptor_data[32] = {
  /* Configuration Descriptor.*/
  USB_DESC_CONFIGURATION(32,            /* wTotalLength.                    */
                         0x01,          /* bNumInterfaces.                  */
                         0x01,          /* bConfigurationValue.             */
                         0,             /* iConfiguration.                  */
                         0xC0,          /* bmAttributes (self powered).     */
                         50),           /* bMaxPower (100mA).               */
  /* Interface Descriptor.*/
  USB_DESC_INTERFACE    (0x00,          /* bInterfaceNumber.                */
                         0x00,          /* bAlternateSetting.               */
                         0x02,          /* bNumEndpoints.                   */
                         0x08,          /* bInterfaceClass (Mass Stprage).  */
                         0x06,          /* bInterfaceSubClass (SCSI
                                           transparent command set, MSCO
                                           chapter 2).                      */
                         0x50,          /* bInterfaceProtocol (Bulk-Only
                                            Mass Storage, MSCO chapter 3).  */
                         4),            /* iInterface.                      */
  /* Endpoint 1 Descriptor.*/
  USB_DESC_ENDPOINT     (MSC_DATA_IN_EP|0x80,   /* bEndpointAddress.        */
                         0x02,          /* bmAttributes (Bulk).             */
                         0x0040,        /* wMaxPacketSize.                  */
                         0x00),         /* bInterval (ignored for bulk).    */
  /* Endpoint 2 Descriptor.*/
  USB_DESC_ENDPOINT     (MSC_DATA_OUT_EP,       /* bEndpointAddress.        */
                         0x02,          /* bmAttributes (Bulk).             */
                         0x0040,        /* wMaxPacketSize.                  */
                         0x00),         /* bInterval (ignored for bulk).    */
};

/*
 * Configuration Descriptor wrapper.
 */
static const USBDescriptor msc_configuration_descriptor = {
  sizeof msc_configuration_descriptor_data,
  msc_configuration_descriptor_data
};

/*
 * U.S. English language identifier.
 */
static const uint8_t msc_string0[] = {
  USB_DESC_BYTE(4),                     /* bLength.                         */
  USB_DESC_BYTE(USB_DESCRIPTOR_STRING), /* bDescriptorType.                 */
  USB_DESC_WORD(0x0409)                 /* wLANGID (U.S. English).          */
};

/*
 * Vendor string.
 */
static const uint8_t msc_string1[] = {
  USB_DESC_BYTE(38),                    /* bLength.                         */
  USB_DESC_BYTE(USB_DESCRIPTOR_STRING), /* bDescriptorType.                 */
  'S', 0, 'T', 0, 'M', 0, 'i', 0, 'c', 0, 'r', 0, 'o', 0, 'e', 0,
  'l', 0, 'e', 0, 'c', 0, 't', 0, 'r', 0, 'o', 0, 'n', 0, 'i', 0,
  'c', 0, 's', 0
};

/*
 * Device Description string.
 */
static const uint8_t msc_string2[] = {
  USB_DESC_BYTE(50),                    /* bLength.                         */
  USB_DESC_BYTE(USB_DESCRIPTOR_STRING), /* bDescriptorType.                 */
  'C', 0, 'h', 0, 'i', 0, 'b', 0, 'i', 0, 'O', 0, 'S', 0, '/', 0,
  'R', 0, 'T', 0, ' ', 0, 'M', 0, 'a', 0, 's', 0, 's', 0, ' ', 0,
  'S', 0, 't', 0, 'o', 0, 'r', 0, 'a', 0, 'g', 0, 'e', 0
};

/*
 * Serial Number string.
 */
static const uint8_t msc_string3[] = {
  USB_DESC_BYTE(8),                     /* bLength.                         */
  USB_DESC_BYTE(USB_DESCRIPTOR_STRING), /* bDescriptorType.                 */
  '0' + CH_KERNEL_MAJOR, 0,
  '0' + CH_KERNEL_MINOR, 0,
  '0' + CH_KERNEL_PATCH, 0
};

/*
 * Interface string.
 */
static const uint8_t msc_string4[] = {
  16,                               /* bLength.                             */
  USB_DESCRIPTOR_STRING,            /* bDescriptorType.                     */
  'S', 0, 'T', 0, ' ', 0, 'M', 0, 'a', 0, 's', 0, 's', 0
};

/*
 * Strings wrappers array.
 */
static const USBDescriptor msc_strings[] = {
  {sizeof msc_string0, msc_string0},
  {sizeof msc_string1, msc_string1},
  {sizeof msc_string2, msc_string2},
  {sizeof msc_string3, msc_string3},
  {sizeof msc_string4, msc_string4}
};

/*
 * Handles the GET_DESCRIPTOR callback. All required descriptors must be
 * handled here.
 */
static const USBDescriptor *get_descriptor(USBDriver *usbp,
                                           uint8_t dtype,
                                           uint8_t dindex,
                                           uint16_t lang) {

  (void)usbp;
  (void)lang;
  switch (dtype) {
  case USB_DESCRIPTOR_DEVICE:
    return &msc_device_descriptor;
  case USB_DESCRIPTOR_CONFIGURATION:
    return &msc_configuration_descriptor;
  case USB_DESCRIPTOR_STRING:
    if (dindex < 5)
      return &msc_strings[dindex];
  }
  return NULL;
}

/*
 * IN EP1 state.
 */
USBInEndpointState ep1state;

/*
 * OUT EP2 state.
 */
USBOutEndpointState ep2state;

/*
 * EP1 initialization structure (IN only).
 */
static const USBEndpointConfig ep1config = {
  USB_EP_MODE_TYPE_BULK | USB_EP_MODE_TRANSACTION,
  mscDataTransmitted,
  NULL,
  0x0040,
  0x0000,
  &ep1state,
  NULL
};

/*
 * EP2 initialization structure (OUT only).
 */
static const USBEndpointConfig ep2config = {
  USB_EP_MODE_TYPE_BULK | USB_EP_MODE_TRANSACTION,
  NULL,
  mscDataReceived,
  0x0000,
  0x0040,
  NULL,
  &ep2state
};

/*
 * Handles the USB driver global events.
 */
static void usb_event(USBDriver *usbp, usbevent_t event) {

  switch (event) {
  case USB_EVENT_RESET:
    return;
  case USB_EVENT_ADDRESS:
    return;
  case USB_EVENT_CONFIGURED:
    /* Enables the endpoints specified into the configuration.
       Note, this callback is invoked from an ISR so I-Class functions
       must be used.*/
    chSysLockFromIsr();
    usbInitEndpointI(usbp, MSC_DATA_IN_EP, &ep1config);
    usbInitEndpointI(usbp, MSC_DATA_OUT_EP, &ep2config);
    chSysUnlockFromIsr();
    return;
  case USB_EVENT_SUSPEND:
    return;
  case USB_EVENT_WAKEUP:
    return;
  case USB_EVENT_STALLED:
    return;
  }
  return;
}

/*
 * Serial over USB driver configuration.
 */
static const USBConfig usbcfg = {
  usb_event,
  get_descriptor,
  mscRequestsHook,
  NULL
};

/*===========================================================================*/
/* Generic code.                                                             */
/*===========================================================================*/

/*
 * Red LED blinker thread, times are in milliseconds.
 */
static WORKING_AREA(waThread1, 128);
static msg_t Thread1(void *arg) {

  (void)arg;
  chRegSetThreadName("blinker");
  while (TRUE) {
    palClearPad(IOPORT3, GPIOC_LED);
    chThdSleepMilliseconds(500);
    palSetPad(IOPORT3, GPIOC_LED);
    chThdSleepMilliseconds(500);
  }
}

/*
 * Application entry point.
 */
int main(void) {

  /*
   * System initializations.
   * - HAL initialization, this also initializes the configured device drivers
   *   and performs the board-specific initializations.
   * - Kernel initialization, the main() function becomes a thread and the
   *   RTOS is active.
   */
  halInit();
  chSysInit();

  /*
   * Activates the USB driver and then the USB bus pull-up on D+.
   */
  usbStart(&USBD1, &usbcfg);
  palClearPad(GPIOC, GPIOC_USB_DISC);

  /*
   * Activates the serial driver 2 using the driver default configuration.
   */
  sdStart(&SD2, NULL);

  /*
   * Creates the blinker thread.
   */
  chThdCreateStatic(waThread1, sizeof(waThread1), NORMALPRIO, Thread1, NULL);

  /*
   * Normal main() thread activity, in this demo it does nothing except
   * sleeping in a loop and check the button state.
   */
  while (TRUE) {
    if (palReadPad(IOPORT1, GPIOA_BUTTON))
      TestThread(&SD2);
    chThdSleepMilliseconds(1000);
  }
}