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a9049e0c AL |
1 | /* Framework for MDIO devices, other than PHYs. |
2 | * | |
3 | * Copyright (c) 2016 Andrew Lunn <andrew@lunn.ch> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License as published by the | |
7 | * Free Software Foundation; either version 2 of the License, or (at your | |
8 | * option) any later version. | |
9 | * | |
10 | */ | |
11 | ||
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt | |
13 | ||
14 | #include <linux/errno.h> | |
15 | #include <linux/init.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/kernel.h> | |
18 | #include <linux/mdio.h> | |
19 | #include <linux/mii.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/phy.h> | |
22 | #include <linux/slab.h> | |
23 | #include <linux/string.h> | |
24 | #include <linux/unistd.h> | |
25 | ||
26 | void mdio_device_free(struct mdio_device *mdiodev) | |
27 | { | |
28 | put_device(&mdiodev->dev); | |
29 | } | |
30 | EXPORT_SYMBOL(mdio_device_free); | |
31 | ||
32 | static void mdio_device_release(struct device *dev) | |
33 | { | |
34 | kfree(to_mdio_device(dev)); | |
35 | } | |
36 | ||
37 | struct mdio_device *mdio_device_create(struct mii_bus *bus, int addr) | |
38 | { | |
39 | struct mdio_device *mdiodev; | |
40 | ||
41 | /* We allocate the device, and initialize the default values */ | |
42 | mdiodev = kzalloc(sizeof(*mdiodev), GFP_KERNEL); | |
43 | if (!mdiodev) | |
44 | return ERR_PTR(-ENOMEM); | |
45 | ||
46 | mdiodev->dev.release = mdio_device_release; | |
47 | mdiodev->dev.parent = &bus->dev; | |
48 | mdiodev->dev.bus = &mdio_bus_type; | |
49 | mdiodev->bus = bus; | |
50 | mdiodev->addr = addr; | |
51 | ||
52 | dev_set_name(&mdiodev->dev, PHY_ID_FMT, bus->id, addr); | |
53 | ||
54 | device_initialize(&mdiodev->dev); | |
55 | ||
56 | return mdiodev; | |
57 | } | |
58 | EXPORT_SYMBOL(mdio_device_create); | |
59 | ||
60 | /** | |
61 | * mdio_device_register - Register the mdio device on the MDIO bus | |
62 | * @mdiodev: mdio_device structure to be added to the MDIO bus | |
63 | */ | |
64 | int mdio_device_register(struct mdio_device *mdiodev) | |
65 | { | |
66 | int err; | |
67 | ||
68 | dev_info(&mdiodev->dev, "mdio_device_register\n"); | |
69 | ||
70 | err = mdiobus_register_device(mdiodev); | |
71 | if (err) | |
72 | return err; | |
73 | ||
74 | err = device_add(&mdiodev->dev); | |
75 | if (err) { | |
76 | pr_err("MDIO %d failed to add\n", mdiodev->addr); | |
77 | goto out; | |
78 | } | |
79 | ||
80 | return 0; | |
81 | ||
82 | out: | |
83 | mdiobus_unregister_device(mdiodev); | |
84 | return err; | |
85 | } | |
86 | EXPORT_SYMBOL(mdio_device_register); | |
87 | ||
88 | /** | |
89 | * mdio_device_remove - Remove a previously registered mdio device from the | |
90 | * MDIO bus | |
91 | * @mdiodev: mdio_device structure to remove | |
92 | * | |
93 | * This doesn't free the mdio_device itself, it merely reverses the effects | |
94 | * of mdio_device_register(). Use mdio_device_free() to free the device | |
95 | * after calling this function. | |
96 | */ | |
97 | void mdio_device_remove(struct mdio_device *mdiodev) | |
98 | { | |
99 | device_del(&mdiodev->dev); | |
100 | mdiobus_unregister_device(mdiodev); | |
101 | } | |
102 | EXPORT_SYMBOL(mdio_device_remove); | |
103 | ||
104 | /** | |
105 | * mdio_probe - probe an MDIO device | |
106 | * @dev: device to probe | |
107 | * | |
108 | * Description: Take care of setting up the mdio_device structure | |
109 | * and calling the driver to probe the device. | |
110 | */ | |
111 | static int mdio_probe(struct device *dev) | |
112 | { | |
113 | struct mdio_device *mdiodev = to_mdio_device(dev); | |
114 | struct device_driver *drv = mdiodev->dev.driver; | |
115 | struct mdio_driver *mdiodrv = to_mdio_driver(drv); | |
116 | int err = 0; | |
117 | ||
118 | if (mdiodrv->probe) | |
119 | err = mdiodrv->probe(mdiodev); | |
120 | ||
121 | return err; | |
122 | } | |
123 | ||
124 | static int mdio_remove(struct device *dev) | |
125 | { | |
126 | struct mdio_device *mdiodev = to_mdio_device(dev); | |
127 | struct device_driver *drv = mdiodev->dev.driver; | |
128 | struct mdio_driver *mdiodrv = to_mdio_driver(drv); | |
129 | ||
130 | if (mdiodrv->remove) | |
131 | mdiodrv->remove(mdiodev); | |
132 | ||
133 | return 0; | |
134 | } | |
135 | ||
136 | /** | |
137 | * mdio_driver_register - register an mdio_driver with the MDIO layer | |
138 | * @new_driver: new mdio_driver to register | |
139 | */ | |
140 | int mdio_driver_register(struct mdio_driver *drv) | |
141 | { | |
142 | struct mdio_driver_common *mdiodrv = &drv->mdiodrv; | |
143 | int retval; | |
144 | ||
145 | pr_info("mdio_driver_register: %s\n", mdiodrv->driver.name); | |
146 | ||
147 | mdiodrv->driver.bus = &mdio_bus_type; | |
148 | mdiodrv->driver.probe = mdio_probe; | |
149 | mdiodrv->driver.remove = mdio_remove; | |
150 | ||
151 | retval = driver_register(&mdiodrv->driver); | |
152 | if (retval) { | |
153 | pr_err("%s: Error %d in registering driver\n", | |
154 | mdiodrv->driver.name, retval); | |
155 | ||
156 | return retval; | |
157 | } | |
158 | ||
159 | return 0; | |
160 | } | |
161 | EXPORT_SYMBOL(mdio_driver_register); | |
162 | ||
163 | void mdio_driver_unregister(struct mdio_driver *drv) | |
164 | { | |
165 | struct mdio_driver_common *mdiodrv = &drv->mdiodrv; | |
166 | ||
167 | driver_unregister(&mdiodrv->driver); | |
168 | } | |
169 | EXPORT_SYMBOL(mdio_driver_unregister); |