drivers/usb/gadget/udc/udc-uclass.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2018 Texas Instruments Incorporated - http://www.ti.com
   4  * Written by Jean-Jacques Hiblot <jjhiblot@ti.com>
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <dm/device-internal.h>
  10 #include <linux/usb/gadget.h>
  11
  12 #if CONFIG_IS_ENABLED(DM_USB_GADGET)
  13 #define MAX_UDC_DEVICES 4
  14 static struct udevice *dev_array[MAX_UDC_DEVICES];
  15 int usb_gadget_initialize(int index)
  16 {
  17         int ret;
  18         struct udevice *dev = NULL;
  19
  20         if (index < 0 || index >= ARRAY_SIZE(dev_array))
  21                 return -EINVAL;
  22         if (dev_array[index])
  23                 return 0;
  24         ret = uclass_get_device_by_seq(UCLASS_USB_GADGET_GENERIC, index, &dev);
  25         if (!dev || ret) {
  26                 pr_err("No USB device found\n");
  27                 return -ENODEV;
  28         }
  29         dev_array[index] = dev;
  30         return 0;
  31 }
  32
  33 int usb_gadget_release(int index)
  34 {
  35 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
  36         int ret;
  37         if (index < 0 || index >= ARRAY_SIZE(dev_array))
  38                 return -EINVAL;
  39
  40         ret = device_remove(dev_array[index], DM_REMOVE_NORMAL);
  41         if (!ret)
  42                 dev_array[index] = NULL;
  43         return ret;
  44 #else
  45         return -ENOTSUPP;
  46 #endif
  47 }
  48
  49 int usb_gadget_handle_interrupts(int index)
  50 {
  51         if (index < 0 || index >= ARRAY_SIZE(dev_array))
  52                 return -EINVAL;
  53         return dm_usb_gadget_handle_interrupts(dev_array[index]);
  54 }
  55 #endif
  56
  57 UCLASS_DRIVER(usb_gadget_generic) = {
  58         .id             = UCLASS_USB_GADGET_GENERIC,
  59         .name           = "usb",
  60         .flags          = DM_UC_FLAG_SEQ_ALIAS,
  61 };