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 #define LOG_CATEGORY UCLASS_USB_GADGET_GENERIC
   8
   9 #include <common.h>
  10 #include <dm.h>
  11 #include <dm/device-internal.h>
  12 #include <linux/usb/gadget.h>
  13
  14 #if CONFIG_IS_ENABLED(DM_USB_GADGET)
  15 #define MAX_UDC_DEVICES 4
  16 static struct udevice *dev_array[MAX_UDC_DEVICES];
  17 int usb_gadget_initialize(int index)
  18 {
  19         int ret;
  20         struct udevice *dev = NULL;
  21
  22         if (index < 0 || index >= ARRAY_SIZE(dev_array))
  23                 return -EINVAL;
  24         if (dev_array[index])
  25                 return 0;
  26         ret = uclass_get_device_by_seq(UCLASS_USB_GADGET_GENERIC, index, &dev);
  27         if (!dev || ret) {
  28                 ret = uclass_get_device(UCLASS_USB_GADGET_GENERIC, index, &dev);
  29                 if (!dev || ret) {
  30                         pr_err("No USB device found\n");
  31                         return -ENODEV;
  32                 }
  33         }
  34         dev_array[index] = dev;
  35         return 0;
  36 }
  37
  38 int usb_gadget_release(int index)
  39 {
  40 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
  41         int ret;
  42         if (index < 0 || index >= ARRAY_SIZE(dev_array))
  43                 return -EINVAL;
  44
  45         ret = device_remove(dev_array[index], DM_REMOVE_NORMAL);
  46         if (!ret)
  47                 dev_array[index] = NULL;
  48         return ret;
  49 #else
  50         return -ENOSYS;
  51 #endif
  52 }
  53
  54 int usb_gadget_handle_interrupts(int index)
  55 {
  56         if (index < 0 || index >= ARRAY_SIZE(dev_array))
  57                 return -EINVAL;
  58         return dm_usb_gadget_handle_interrupts(dev_array[index]);
  59 }
  60 #endif
  61
  62 UCLASS_DRIVER(usb_gadget_generic) = {
  63         .id             = UCLASS_USB_GADGET_GENERIC,
  64         .name           = "usb",
  65         .flags          = DM_UC_FLAG_SEQ_ALIAS,
  66 };