1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_MDIO_BITBANG_H
3 #define __LINUX_MDIO_BITBANG_H
4
5 #include <linux/phy.h>
6
7 struct module;
8
9 struct mdiobb_ctrl;
10
11 struct mdiobb_ops {
12 struct module *owner;
13
14 /* Set the Management Data Clock high if level is one,
15 * low if level is zero.
16 */
17 void (*set_mdc)(struct mdiobb_ctrl *ctrl, int level);
18
19 /* Configure the Management Data I/O pin as an input if
20 * "output" is zero, or an output if "output" is one.
21 */
22 void (*set_mdio_dir)(struct mdiobb_ctrl *ctrl, int output);
23
24 /* Set the Management Data I/O pin high if value is one,
25 * low if "value" is zero. This may only be called
26 * when the MDIO pin is configured as an output.
27 */
28 void (*set_mdio_data)(struct mdiobb_ctrl *ctrl, int value);
29
30 /* Retrieve the state Management Data I/O pin. */
31 int (*get_mdio_data)(struct mdiobb_ctrl *ctrl);
32 };
33
34 struct mdiobb_ctrl {
35 const struct mdiobb_ops *ops;
36 };
37
38 /* The returned bus is not yet registered with the phy layer. */
39 struct mii_bus *alloc_mdio_bitbang(struct mdiobb_ctrl *ctrl);
40
41 /* The bus must already have been unregistered. */
42 void free_mdio_bitbang(struct mii_bus *bus);
43
44 #endif