1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (C) 2011, 2012 Cavium, Inc.
4 */
5
6#include <linux/device.h>
7#include <linux/gpio/consumer.h>
8#include <linux/mdio-mux.h>
9#include <linux/module.h>
10#include <linux/of_mdio.h>
11#include <linux/phy.h>
12#include <linux/platform_device.h>
13
14#define DRV_VERSION "1.1"
15#define DRV_DESCRIPTION "GPIO controlled MDIO bus multiplexer driver"
16
17struct mdio_mux_gpio_state {
18 struct gpio_descs *gpios;
19 void *mux_handle;
20};
21
22static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
23 void *data)
24{
25 struct mdio_mux_gpio_state *s = data;
26 DECLARE_BITMAP(values, BITS_PER_TYPE(desired_child));
27
28 if (current_child == desired_child)
29 return 0;
30
31 values[0] = desired_child;
32
33 gpiod_set_array_value_cansleep(array_size: s->gpios->ndescs, desc_array: s->gpios->desc,
34 array_info: s->gpios->info, value_bitmap: values);
35
36 return 0;
37}
38
39static int mdio_mux_gpio_probe(struct platform_device *pdev)
40{
41 struct mdio_mux_gpio_state *s;
42 struct gpio_descs *gpios;
43 int r;
44
45 gpios = devm_gpiod_get_array(dev: &pdev->dev, NULL, flags: GPIOD_OUT_LOW);
46 if (IS_ERR(ptr: gpios))
47 return PTR_ERR(ptr: gpios);
48
49 s = devm_kzalloc(dev: &pdev->dev, size: sizeof(*s), GFP_KERNEL);
50 if (!s)
51 return -ENOMEM;
52
53 s->gpios = gpios;
54
55 r = mdio_mux_init(dev: &pdev->dev, mux_node: pdev->dev.of_node,
56 switch_fn: mdio_mux_gpio_switch_fn, mux_handle: &s->mux_handle, data: s, NULL);
57
58 if (r != 0)
59 return r;
60
61 pdev->dev.platform_data = s;
62 return 0;
63}
64
65static void mdio_mux_gpio_remove(struct platform_device *pdev)
66{
67 struct mdio_mux_gpio_state *s = dev_get_platdata(dev: &pdev->dev);
68 mdio_mux_uninit(mux_handle: s->mux_handle);
69}
70
71static const struct of_device_id mdio_mux_gpio_match[] = {
72 {
73 .compatible = "mdio-mux-gpio",
74 },
75 {
76 /* Legacy compatible property. */
77 .compatible = "cavium,mdio-mux-sn74cbtlv3253",
78 },
79 {},
80};
81MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match);
82
83static struct platform_driver mdio_mux_gpio_driver = {
84 .driver = {
85 .name = "mdio-mux-gpio",
86 .of_match_table = mdio_mux_gpio_match,
87 },
88 .probe = mdio_mux_gpio_probe,
89 .remove_new = mdio_mux_gpio_remove,
90};
91
92module_platform_driver(mdio_mux_gpio_driver);
93
94MODULE_DESCRIPTION(DRV_DESCRIPTION);
95MODULE_VERSION(DRV_VERSION);
96MODULE_AUTHOR("David Daney");
97MODULE_LICENSE("GPL v2");
98

source code of linux/drivers/net/mdio/mdio-mux-gpio.c