1/*
  2 * This file is subject to the terms and conditions of the GNU General Public
  3 * License.  See the file "COPYING" in the main directory of this archive
  4 * for more details.
  5 *
  6 * Copyright (C) 2011, 2012 Cavium, Inc.
  7 */
  8
  9#include <linux/platform_device.h>
 10#include <linux/device.h>
 11#include <linux/of_mdio.h>
 12#include <linux/module.h>
 13#include <linux/phy.h>
 14#include <linux/mdio-mux.h>
 15#include <linux/gpio/consumer.h>
 16
 17#define DRV_VERSION "1.1"
 18#define DRV_DESCRIPTION "GPIO controlled MDIO bus multiplexer driver"
 19
 20struct mdio_mux_gpio_state {
 21	struct gpio_descs *gpios;
 22	void *mux_handle;
 23};
 24
 25static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
 26				   void *data)
 27{
 28	struct mdio_mux_gpio_state *s = data;
 29	int values[s->gpios->ndescs];
 30	unsigned int n;
 31
 32	if (current_child == desired_child)
 33		return 0;
 34
 35	for (n = 0; n < s->gpios->ndescs; n++)
 36		values[n] = (desired_child >> n) & 1;
 37
 38	gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
 39				       values);
 40
 41	return 0;
 42}
 43
 44static int mdio_mux_gpio_probe(struct platform_device *pdev)
 45{
 46	struct mdio_mux_gpio_state *s;
 
 47	int r;
 48
 
 
 
 
 49	s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
 50	if (!s)
 51		return -ENOMEM;
 52
 53	s->gpios = gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW);
 54	if (IS_ERR(s->gpios))
 55		return PTR_ERR(s->gpios);
 56
 57	r = mdio_mux_init(&pdev->dev, pdev->dev.of_node,
 58			  mdio_mux_gpio_switch_fn, &s->mux_handle, s, NULL);
 59
 60	if (r != 0) {
 61		gpiod_put_array(s->gpios);
 62		return r;
 63	}
 64
 65	pdev->dev.platform_data = s;
 66	return 0;
 67}
 68
 69static int mdio_mux_gpio_remove(struct platform_device *pdev)
 70{
 71	struct mdio_mux_gpio_state *s = dev_get_platdata(&pdev->dev);
 72	mdio_mux_uninit(s->mux_handle);
 73	gpiod_put_array(s->gpios);
 74	return 0;
 75}
 76
 77static const struct of_device_id mdio_mux_gpio_match[] = {
 78	{
 79		.compatible = "mdio-mux-gpio",
 80	},
 81	{
 82		/* Legacy compatible property. */
 83		.compatible = "cavium,mdio-mux-sn74cbtlv3253",
 84	},
 85	{},
 86};
 87MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match);
 88
 89static struct platform_driver mdio_mux_gpio_driver = {
 90	.driver = {
 91		.name		= "mdio-mux-gpio",
 92		.of_match_table = mdio_mux_gpio_match,
 93	},
 94	.probe		= mdio_mux_gpio_probe,
 95	.remove		= mdio_mux_gpio_remove,
 96};
 97
 98module_platform_driver(mdio_mux_gpio_driver);
 99
100MODULE_DESCRIPTION(DRV_DESCRIPTION);
101MODULE_VERSION(DRV_VERSION);
102MODULE_AUTHOR("David Daney");
103MODULE_LICENSE("GPL");

 1// SPDX-License-Identifier: GPL-2.0
 2/*
 
 
 
 
 3 * Copyright (C) 2011, 2012 Cavium, Inc.
 4 */
 5
 6#include <linux/platform_device.h>
 7#include <linux/device.h>
 8#include <linux/of_mdio.h>
 9#include <linux/module.h>
10#include <linux/phy.h>
11#include <linux/mdio-mux.h>
12#include <linux/gpio/consumer.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(s->gpios->ndescs, s->gpios->desc,
34				       s->gpios->info, 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(&pdev->dev, NULL, GPIOD_OUT_LOW);
46	if (IS_ERR(gpios))
47		return PTR_ERR(gpios);
48
49	s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
50	if (!s)
51		return -ENOMEM;
52
53	s->gpios = gpios;
 
 
54
55	r = mdio_mux_init(&pdev->dev, pdev->dev.of_node,
56			  mdio_mux_gpio_switch_fn, &s->mux_handle, s, NULL);
57
58	if (r != 0)
 
59		return r;
 
60
61	pdev->dev.platform_data = s;
62	return 0;
63}
64
65static int mdio_mux_gpio_remove(struct platform_device *pdev)
66{
67	struct mdio_mux_gpio_state *s = dev_get_platdata(&pdev->dev);
68	mdio_mux_uninit(s->mux_handle);
 
69	return 0;
70}
71
72static const struct of_device_id mdio_mux_gpio_match[] = {
73	{
74		.compatible = "mdio-mux-gpio",
75	},
76	{
77		/* Legacy compatible property. */
78		.compatible = "cavium,mdio-mux-sn74cbtlv3253",
79	},
80	{},
81};
82MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match);
83
84static struct platform_driver mdio_mux_gpio_driver = {
85	.driver = {
86		.name		= "mdio-mux-gpio",
87		.of_match_table = mdio_mux_gpio_match,
88	},
89	.probe		= mdio_mux_gpio_probe,
90	.remove		= mdio_mux_gpio_remove,
91};
92
93module_platform_driver(mdio_mux_gpio_driver);
94
95MODULE_DESCRIPTION(DRV_DESCRIPTION);
96MODULE_VERSION(DRV_VERSION);
97MODULE_AUTHOR("David Daney");
98MODULE_LICENSE("GPL v2");