include/misc.h

   1 /*
   2  * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #ifndef _MISC_H_
   8 #define _MISC_H_
   9
  10 /*
  11  * Read the device to buffer, optional.
  12  *
  13  * @dev: the device
  14  * @offset: offset to read the device
  15  * @buf: pointer to data buffer
  16  * @size: data size in bytes to read the device
  17  * @return: 0 if OK, -ve on error
  18  */
  19 int misc_read(struct udevice *dev, int offset, void *buf, int size);
  20 /*
  21  * Write buffer to the device, optional.
  22  *
  23  * @dev: the device
  24  * @offset: offset to write the device
  25  * @buf: pointer to data buffer
  26  * @size: data size in bytes to write the device
  27  * @return: 0 if OK, -ve on error
  28  */
  29 int misc_write(struct udevice *dev, int offset, void *buf, int size);
  30 /*
  31  * Assert command to the device, optional.
  32  *
  33  * @dev: the device
  34  * @request: command to be sent to the device
  35  * @buf: pointer to buffer related to the request
  36  * @return: 0 if OK, -ve on error
  37  */
  38 int misc_ioctl(struct udevice *dev, unsigned long request, void *buf);
  39
  40 /*
  41  * Send a message to the device and wait for a response.
  42  *
  43  * The caller provides the message type/ID and payload to be sent.
  44  * The callee constructs any message header required, transmits it to the
  45  * target, waits for a response, checks any error code in the response,
  46  * strips any message header from the response, and returns the error code
  47  * (or a parsed version of it) and the response message payload.
  48  *
  49  * @dev: the device.
  50  * @msgid: the message ID/number to send.
  51  * tx_msg: the request/transmit message payload.
  52  * tx_size: the size of the buffer pointed at by tx_msg.
  53  * rx_msg: the buffer to receive the response message payload. May be NULL if
  54  *         the caller only cares about the error code.
  55  * rx_size: the size of the buffer pointed at by rx_msg.
  56  * @return the response message size if OK, -ve on error
  57  */
  58 int misc_call(struct udevice *dev, int msgid, void *tx_msg, int tx_size,
  59               void *rx_msg, int rx_size);
  60
  61 /*
  62  * struct misc_ops - Driver model Misc operations
  63  *
  64  * The uclass interface is implemented by all miscellaneous devices which
  65  * use driver model.
  66  */
  67 struct misc_ops {
  68         /*
  69          * Read the device to buffer, optional.
  70          *
  71          * @dev: the device
  72          * @offset: offset to read the device
  73          * @buf: pointer to data buffer
  74          * @size: data size in bytes to read the device
  75          * @return: 0 if OK, -ve on error
  76          */
  77         int (*read)(struct udevice *dev, int offset, void *buf, int size);
  78         /*
  79          * Write buffer to the device, optional.
  80          *
  81          * @dev: the device
  82          * @offset: offset to write the device
  83          * @buf: pointer to data buffer
  84          * @size: data size in bytes to write the device
  85          * @return: 0 if OK, -ve on error
  86          */
  87         int (*write)(struct udevice *dev, int offset, const void *buf,
  88                      int size);
  89         /*
  90          * Assert command to the device, optional.
  91          *
  92          * @dev: the device
  93          * @request: command to be sent to the device
  94          * @buf: pointer to buffer related to the request
  95          * @return: 0 if OK, -ve on error
  96          */
  97         int (*ioctl)(struct udevice *dev, unsigned long request, void *buf);
  98         /*
  99          * Send a message to the device and wait for a response.
 100          *
 101          * @dev: the device
 102          * @msgid: the message ID/number to send
 103          * tx_msg: the request/transmit message payload
 104          * tx_size: the size of the buffer pointed at by tx_msg
 105          * rx_msg: the buffer to receive the response message payload. May be
 106          *         NULL if the caller only cares about the error code.
 107          * rx_size: the size of the buffer pointed at by rx_msg
 108          * @return the response message size if OK, -ve on error
 109          */
 110         int (*call)(struct udevice *dev, int msgid, void *tx_msg, int tx_size,
 111                     void *rx_msg, int rx_size);
 112 };
 113
 114 #endif  /* _MISC_H_ */