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 	unsigned int override_op_c22;
37 	u8 op_c22_read;
38 	u8 op_c22_write;
39 };
40 
41 int mdiobb_read(struct mii_bus *bus, int phy, int reg);
42 int mdiobb_write(struct mii_bus *bus, int phy, int reg, u16 val);
43 
44 /* The returned bus is not yet registered with the phy layer. */
45 struct mii_bus *alloc_mdio_bitbang(struct mdiobb_ctrl *ctrl);
46 
47 /* The bus must already have been unregistered. */
48 void free_mdio_bitbang(struct mii_bus *bus);
49 
50 #endif
51