1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * Copyright (c) 2013 Google, Inc 4 * 5 * (C) Copyright 2012 6 * Pavel Herrmann <morpheus.ibis@gmail.com> 7 */ 8 9 #ifndef _DM_UCLASS_INTERNAL_H 10 #define _DM_UCLASS_INTERNAL_H 11 12 #include <dm/ofnode.h> 13 14 /** 15 * uclass_get_device_tail() - handle the end of a get_device call 16 * 17 * This handles returning an error or probing a device as needed. 18 * 19 * @dev: Device that needs to be probed 20 * @ret: Error to return. If non-zero then the device is not probed 21 * @devp: Returns the value of 'dev' if there is no error 22 * @return ret, if non-zero, else the result of the device_probe() call 23 */ 24 int uclass_get_device_tail(struct udevice *dev, int ret, struct udevice **devp); 25 26 /** 27 * dev_get_uclass_index() - Get uclass and index of device 28 * @dev: - in - Device that we want the uclass/index of 29 * @ucp: - out - A pointer to the uclass the device belongs to 30 * 31 * The device is not prepared for use - this is an internal function. 32 * 33 * @return the index of the device in the uclass list or -ENODEV if not found. 34 */ 35 int dev_get_uclass_index(struct udevice *dev, struct uclass **ucp); 36 37 /** 38 * uclass_find_device() - Return n-th child of uclass 39 * @id: Id number of the uclass 40 * @index: Position of the child in uclass's list 41 * #devp: Returns pointer to device, or NULL on error 42 * 43 * The device is not prepared for use - this is an internal function. 44 * The function uclass_get_device_tail() can be used to probe the device. 45 * 46 * @return the uclass pointer of a child at the given index or 47 * return NULL on error. 48 */ 49 int uclass_find_device(enum uclass_id id, int index, struct udevice **devp); 50 51 /** 52 * uclass_find_first_device() - Return the first device in a uclass 53 * @id: Id number of the uclass 54 * #devp: Returns pointer to device, or NULL on error 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_first_device(enum uclass_id id, struct udevice **devp); 62 63 /** 64 * uclass_find_next_device() - Return the next device in a uclass 65 * @devp: On entry, pointer to device to lookup. On exit, returns pointer 66 * to the next device in the same uclass, or NULL if none 67 * 68 * The device is not prepared for use - this is an internal function. 69 * The function uclass_get_device_tail() can be used to probe the device. 70 * 71 * @return 0 if OK (found or not found), -1 on error 72 */ 73 int uclass_find_next_device(struct udevice **devp); 74 75 /** 76 * uclass_find_device_by_name() - Find uclass device based on ID and name 77 * 78 * This searches for a device with the exactly given name. 79 * 80 * The device is NOT probed, it is merely returned. 81 * 82 * @id: ID to look up 83 * @name: name of a device to find 84 * @devp: Returns pointer to device (the first one with the name) 85 * @return 0 if OK, -ve on error 86 */ 87 int uclass_find_device_by_name(enum uclass_id id, const char *name, 88 struct udevice **devp); 89 90 /** 91 * uclass_find_device_by_seq() - Find uclass device based on ID and sequence 92 * 93 * This searches for a device with the given seq or req_seq. 94 * 95 * For seq, if an active device has this sequence it will be returned. 96 * If there is no such device then this will return -ENODEV. 97 * 98 * For req_seq, if a device (whether activated or not) has this req_seq 99 * value, that device will be returned. This is a strong indication that 100 * the device will receive that sequence when activated. 101 * 102 * The device is NOT probed, it is merely returned. 103 * 104 * @id: ID to look up 105 * @seq_or_req_seq: Sequence number to find (0=first) 106 * @find_req_seq: true to find req_seq, false to find seq 107 * @devp: Returns pointer to device (there is only one per for each seq) 108 * @return 0 if OK, -ve on error 109 */ 110 int uclass_find_device_by_seq(enum uclass_id id, int seq_or_req_seq, 111 bool find_req_seq, struct udevice **devp); 112 113 /** 114 * uclass_find_device_by_of_offset() - Find a uclass device by device tree node 115 * 116 * This searches the devices in the uclass for one attached to the given 117 * device tree node. 118 * 119 * The device is NOT probed, it is merely returned. 120 * 121 * @id: ID to look up 122 * @node: Device tree offset to search for (if -ve then -ENODEV is returned) 123 * @devp: Returns pointer to device (there is only one for each node) 124 * @return 0 if OK, -ve on error 125 */ 126 int uclass_find_device_by_of_offset(enum uclass_id id, int node, 127 struct udevice **devp); 128 129 /** 130 * uclass_find_device_by_of_node() - Find a uclass device by device tree node 131 * 132 * This searches the devices in the uclass for one attached to the given 133 * device tree node. 134 * 135 * The device is NOT probed, it is merely returned. 136 * 137 * @id: ID to look up 138 * @node: Device tree offset to search for (if NULL then -ENODEV is returned) 139 * @devp: Returns pointer to device (there is only one for each node) 140 * @return 0 if OK, -ve on error 141 */ 142 int uclass_find_device_by_ofnode(enum uclass_id id, ofnode node, 143 struct udevice **devp); 144 145 /** 146 * uclass_bind_device() - Associate device with a uclass 147 * 148 * Connect the device into uclass's list of devices. 149 * 150 * @dev: Pointer to the device 151 * #return 0 on success, -ve on error 152 */ 153 int uclass_bind_device(struct udevice *dev); 154 155 /** 156 * uclass_unbind_device() - Deassociate device with a uclass 157 * 158 * Disconnect the device from uclass's list of devices. 159 * 160 * @dev: Pointer to the device 161 * #return 0 on success, -ve on error 162 */ 163 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE) 164 int uclass_unbind_device(struct udevice *dev); 165 #else 166 static inline int uclass_unbind_device(struct udevice *dev) { return 0; } 167 #endif 168 169 /** 170 * uclass_pre_probe_device() - Deal with a device that is about to be probed 171 * 172 * Perform any pre-processing that is needed by the uclass before it can be 173 * probed. This includes the uclass' pre-probe() method and the parent 174 * uclass' child_pre_probe() method. 175 * 176 * @dev: Pointer to the device 177 * #return 0 on success, -ve on error 178 */ 179 int uclass_pre_probe_device(struct udevice *dev); 180 181 /** 182 * uclass_post_probe_device() - Deal with a device that has just been probed 183 * 184 * Perform any post-processing of a probed device that is needed by the 185 * uclass. 186 * 187 * @dev: Pointer to the device 188 * #return 0 on success, -ve on error 189 */ 190 int uclass_post_probe_device(struct udevice *dev); 191 192 /** 193 * uclass_pre_remove_device() - Handle a device which is about to be removed 194 * 195 * Perform any pre-processing of a device that is about to be removed. 196 * 197 * @dev: Pointer to the device 198 * #return 0 on success, -ve on error 199 */ 200 #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE) 201 int uclass_pre_remove_device(struct udevice *dev); 202 #else 203 static inline int uclass_pre_remove_device(struct udevice *dev) { return 0; } 204 #endif 205 206 /** 207 * uclass_find() - Find uclass by its id 208 * 209 * @id: Id to serach for 210 * @return pointer to uclass, or NULL if not found 211 */ 212 struct uclass *uclass_find(enum uclass_id key); 213 214 /** 215 * uclass_destroy() - Destroy a uclass 216 * 217 * Destroy a uclass and all its devices 218 * 219 * @uc: uclass to destroy 220 * @return 0 on success, -ve on error 221 */ 222 int uclass_destroy(struct uclass *uc); 223 224 #endif 225