include/dm/uclass-internal.h

   1 /*
   2  * Copyright (c) 2013 Google, Inc
   3  *
   4  * (C) Copyright 2012
   5  * Pavel Herrmann <morpheus.ibis@gmail.com>
   6  *
   7  * SPDX-License-Identifier:     GPL-2.0+
   8  */
   9
  10 #ifndef _DM_UCLASS_INTERNAL_H
  11 #define _DM_UCLASS_INTERNAL_H
  12
  13 /**
  14  * uclass_get_device_tail() - handle the end of a get_device call
  15  *
  16  * This handles returning an error or probing a device as needed.
  17  *
  18  * @dev: Device that needs to be probed
  19  * @ret: Error to return. If non-zero then the device is not probed
  20  * @devp: Returns the value of 'dev' if there is no error
  21  * @return ret, if non-zero, else the result of the device_probe() call
  22  */
  23 int uclass_get_device_tail(struct udevice *dev, int ret, struct udevice **devp);
  24
  25 /**
  26  * uclass_find_device() - Return n-th child of uclass
  27  * @id:         Id number of the uclass
  28  * @index:      Position of the child in uclass's list
  29  * #devp:       Returns pointer to device, or NULL on error
  30  *
  31  * The device is not prepared for use - this is an internal function.
  32  * The function uclass_get_device_tail() can be used to probe the device.
  33  *
  34  * @return the uclass pointer of a child at the given index or
  35  * return NULL on error.
  36  */
  37 int uclass_find_device(enum uclass_id id, int index, struct udevice **devp);
  38
  39 /**
  40  * uclass_find_first_device() - Return the first device in a uclass
  41  * @id:         Id number of the uclass
  42  * #devp:       Returns pointer to device, or NULL on error
  43  *
  44  * The device is not prepared for use - this is an internal function.
  45  * The function uclass_get_device_tail() can be used to probe the device.
  46  *
  47  * @return 0 if OK (found or not found), -1 on error
  48  */
  49 int uclass_find_first_device(enum uclass_id id, struct udevice **devp);
  50
  51 /**
  52  * uclass_find_next_device() - Return the next device in a uclass
  53  * @devp: On entry, pointer to device to lookup. On exit, returns pointer
  54  * to the next device in the same uclass, or NULL if none
  55  *
  56  * The device is not prepared for use - this is an internal function.
  57  * The function uclass_get_device_tail() can be used to probe the device.
  58  *
  59  * @return 0 if OK (found or not found), -1 on error
  60  */
  61 int uclass_find_next_device(struct udevice **devp);
  62
  63 /**
  64  * uclass_find_device_by_name() - Find uclass device based on ID and name
  65  *
  66  * This searches for a device with the exactly given name.
  67  *
  68  * The device is NOT probed, it is merely returned.
  69  *
  70  * @id: ID to look up
  71  * @name: name of a device to find
  72  * @devp: Returns pointer to device (the first one with the name)
  73  * @return 0 if OK, -ve on error
  74  */
  75 int uclass_find_device_by_name(enum uclass_id id, const char *name,
  76                                struct udevice **devp);
  77
  78 /**
  79  * uclass_find_device_by_seq() - Find uclass device based on ID and sequence
  80  *
  81  * This searches for a device with the given seq or req_seq.
  82  *
  83  * For seq, if an active device has this sequence it will be returned.
  84  * If there is no such device then this will return -ENODEV.
  85  *
  86  * For req_seq, if a device (whether activated or not) has this req_seq
  87  * value, that device will be returned. This is a strong indication that
  88  * the device will receive that sequence when activated.
  89  *
  90  * The device is NOT probed, it is merely returned.
  91  *
  92  * @id: ID to look up
  93  * @seq_or_req_seq: Sequence number to find (0=first)
  94  * @find_req_seq: true to find req_seq, false to find seq
  95  * @devp: Returns pointer to device (there is only one per for each seq)
  96  * @return 0 if OK, -ve on error
  97  */
  98 int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq,
  99                               bool find_req_seq, struct udevice **devp);
 100
 101 /**
 102  * uclass_bind_device() - Associate device with a uclass
 103  *
 104  * Connect the device into uclass's list of devices.
 105  *
 106  * @dev:        Pointer to the device
 107  * #return 0 on success, -ve on error
 108  */
 109 int uclass_bind_device(struct udevice *dev);
 110
 111 /**
 112  * uclass_unbind_device() - Deassociate device with a uclass
 113  *
 114  * Disconnect the device from uclass's list of devices.
 115  *
 116  * @dev:        Pointer to the device
 117  * #return 0 on success, -ve on error
 118  */
 119 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
 120 int uclass_unbind_device(struct udevice *dev);
 121 #else
 122 static inline int uclass_unbind_device(struct udevice *dev) { return 0; }
 123 #endif
 124
 125 /**
 126  * uclass_pre_probe_device() - Deal with a device that is about to be probed
 127  *
 128  * Perform any pre-processing that is needed by the uclass before it can be
 129  * probed. This includes the uclass' pre-probe() method and the parent
 130  * uclass' child_pre_probe() method.
 131  *
 132  * @dev:        Pointer to the device
 133  * #return 0 on success, -ve on error
 134  */
 135 int uclass_pre_probe_device(struct udevice *dev);
 136
 137 /**
 138  * uclass_post_probe_device() - Deal with a device that has just been probed
 139  *
 140  * Perform any post-processing of a probed device that is needed by the
 141  * uclass.
 142  *
 143  * @dev:        Pointer to the device
 144  * #return 0 on success, -ve on error
 145  */
 146 int uclass_post_probe_device(struct udevice *dev);
 147
 148 /**
 149  * uclass_pre_remove_device() - Handle a device which is about to be removed
 150  *
 151  * Perform any pre-processing of a device that is about to be removed.
 152  *
 153  * @dev:        Pointer to the device
 154  * #return 0 on success, -ve on error
 155  */
 156 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
 157 int uclass_pre_remove_device(struct udevice *dev);
 158 #else
 159 static inline int uclass_pre_remove_device(struct udevice *dev) { return 0; }
 160 #endif
 161
 162 /**
 163  * uclass_find() - Find uclass by its id
 164  *
 165  * @id:         Id to serach for
 166  * @return pointer to uclass, or NULL if not found
 167  */
 168 struct uclass *uclass_find(enum uclass_id key);
 169
 170 /**
 171  * uclass_destroy() - Destroy a uclass
 172  *
 173  * Destroy a uclass and all its devices
 174  *
 175  * @uc: uclass to destroy
 176  * @return 0 on success, -ve on error
 177  */
 178 int uclass_destroy(struct uclass *uc);
 179
 180 #endif