1 #ifndef __LINUX_MDIO_BITBANG_H
2 #define __LINUX_MDIO_BITBANG_H
3 
4 #include <linux/phy.h>
5 
6 struct module;
7 
8 struct mdiobb_ctrl;
9 
10 struct mdiobb_ops {
11 	struct module *owner;
12 
13 	/* Set the Management Data Clock high if level is one,
14 	 * low if level is zero.
15 	 */
16 	void (*set_mdc)(struct mdiobb_ctrl *ctrl, int level);
17 
18 	/* Configure the Management Data I/O pin as an input if
19 	 * "output" is zero, or an output if "output" is one.
20 	 */
21 	void (*set_mdio_dir)(struct mdiobb_ctrl *ctrl, int output);
22 
23 	/* Set the Management Data I/O pin high if value is one,
24 	 * low if "value" is zero.  This may only be called
25 	 * when the MDIO pin is configured as an output.
26 	 */
27 	void (*set_mdio_data)(struct mdiobb_ctrl *ctrl, int value);
28 
29 	/* Retrieve the state Management Data I/O pin. */
30 	int (*get_mdio_data)(struct mdiobb_ctrl *ctrl);
31 };
32 
33 struct mdiobb_ctrl {
34 	const struct mdiobb_ops *ops;
35 	/* reset callback */
36 	int (*reset)(struct mii_bus *bus);
37 };
38 
39 /* The returned bus is not yet registered with the phy layer. */
40 struct mii_bus *alloc_mdio_bitbang(struct mdiobb_ctrl *ctrl);
41 
42 /* The bus must already have been unregistered. */
43 void free_mdio_bitbang(struct mii_bus *bus);
44 
45 #endif
46