1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * Copyright (C) 2015 Thomas Chou <thomas@wytron.com.tw>
10 * misc_read() - Read the device to buffer, optional.
12 * @offset: offset to read the device
13 * @buf: pointer to data buffer
14 * @size: data size in bytes to read the device
16 * Return: number of bytes read if OK (may be 0 if EOF), -ve on error
18 int misc_read(struct udevice *dev, int offset, void *buf, int size);
21 * misc_write() - Write buffer to the device, optional.
23 * @offset: offset to write the device
24 * @buf: pointer to data buffer
25 * @size: data size in bytes to write the device
27 * Return: number of bytes written if OK (may be < @size), -ve on error
29 int misc_write(struct udevice *dev, int offset, void *buf, int size);
32 * misc_ioctl() - Assert command to the device, optional.
34 * @request: command to be sent to the device
35 * @buf: pointer to buffer related to the request
37 * Return: 0 if OK, -ve on error
39 int misc_ioctl(struct udevice *dev, unsigned long request, void *buf);
42 * misc_call() - Send a message to the device and wait for a response.
44 * @msgid: the message ID/number to send.
45 * @tx_msg: the request/transmit message payload.
46 * @tx_size: the size of the buffer pointed at by tx_msg.
47 * @rx_msg: the buffer to receive the response message payload. May be NULL if
48 * the caller only cares about the error code.
49 * @rx_size: the size of the buffer pointed at by rx_msg.
51 * The caller provides the message type/ID and payload to be sent.
52 * The callee constructs any message header required, transmits it to the
53 * target, waits for a response, checks any error code in the response,
54 * strips any message header from the response, and returns the error code
55 * (or a parsed version of it) and the response message payload.
57 * Return: the response message size if OK, -ve on error
59 int misc_call(struct udevice *dev, int msgid, void *tx_msg, int tx_size,
60 void *rx_msg, int rx_size);
63 * misc_set_enabled() - Enable or disable a device.
64 * @dev: the device to enable or disable.
65 * @val: the flag that tells the driver to either enable or disable the device.
67 * The semantics of "disable" and "enable" should be understood here as
68 * activating or deactivating the device's primary function, hence a "disabled"
69 * device should be dormant, but still answer to commands and queries.
71 * A probed device may start in a disabled or enabled state, depending on the
72 * driver and hardware.
74 * Return: -ve on error, 0 if the previous state was "disabled", 1 if the
75 * previous state was "enabled"
77 int misc_set_enabled(struct udevice *dev, bool val);
80 * struct misc_ops - Driver model Misc operations
82 * The uclass interface is implemented by all miscellaneous devices which
87 * Read the device to buffer, optional.
89 * @offset: offset to read the device
90 * @buf: pointer to data buffer
91 * @size: data size in bytes to read the device
93 * Return: number of bytes read if OK (may be 0 if EOF), -ve on error
95 int (*read)(struct udevice *dev, int offset, void *buf, int size);
98 * Write buffer to the device, optional.
100 * @offset: offset to write the device
101 * @buf: pointer to data buffer
102 * @size: data size in bytes to write the device
104 * Return: number of bytes written if OK (may be < @size), -ve on error
106 int (*write)(struct udevice *dev, int offset, const void *buf,
109 * Assert command to the device, optional.
111 * @request: command to be sent to the device
112 * @buf: pointer to buffer related to the request
114 * Return: 0 if OK, -ve on error
116 int (*ioctl)(struct udevice *dev, unsigned long request, void *buf);
119 * Send a message to the device and wait for a response.
121 * @msgid: the message ID/number to send
122 * @tx_msg: the request/transmit message payload
123 * @tx_size: the size of the buffer pointed at by tx_msg
124 * @rx_msg: the buffer to receive the response message payload. May be
125 * NULL if the caller only cares about the error code.
126 * @rx_size: the size of the buffer pointed at by rx_msg
128 * Return: the response message size if OK, -ve on error
130 int (*call)(struct udevice *dev, int msgid, void *tx_msg, int tx_size,
131 void *rx_msg, int rx_size);
133 * Enable or disable a device, optional.
134 * @dev: the device to enable.
135 * @val: the flag that tells the driver to either enable or disable the
138 * Return: -ve on error, 0 if the previous state was "disabled", 1 if
139 * the previous state was "enabled"
141 int (*set_enabled)(struct udevice *dev, bool val);
144 #endif /* _MISC_H_ */