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
6 * Copyright (C) 2011, 2012 Cavium, Inc.
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>
17 #define DRV_VERSION "1.1"
18 #define DRV_DESCRIPTION "GPIO controlled MDIO bus multiplexer driver"
20 struct mdio_mux_gpio_state {
21 struct gpio_descs *gpios;
25 static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
28 struct mdio_mux_gpio_state *s = data;
29 int values[s->gpios->ndescs];
32 if (current_child == desired_child)
35 for (n = 0; n < s->gpios->ndescs; n++)
36 values[n] = (desired_child >> n) & 1;
38 gpiod_set_array_cansleep(s->gpios->ndescs, s->gpios->desc, values);
43 static int mdio_mux_gpio_probe(struct platform_device *pdev)
45 struct mdio_mux_gpio_state *s;
48 s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
52 s->gpios = gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW);
54 return PTR_ERR(s->gpios);
56 r = mdio_mux_init(&pdev->dev,
57 mdio_mux_gpio_switch_fn, &s->mux_handle, s);
60 gpiod_put_array(s->gpios);
64 pdev->dev.platform_data = s;
68 static int mdio_mux_gpio_remove(struct platform_device *pdev)
70 struct mdio_mux_gpio_state *s = dev_get_platdata(&pdev->dev);
71 mdio_mux_uninit(s->mux_handle);
72 gpiod_put_array(s->gpios);
76 static const struct of_device_id mdio_mux_gpio_match[] = {
78 .compatible = "mdio-mux-gpio",
81 /* Legacy compatible property. */
82 .compatible = "cavium,mdio-mux-sn74cbtlv3253",
86 MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match);
88 static struct platform_driver mdio_mux_gpio_driver = {
90 .name = "mdio-mux-gpio",
91 .of_match_table = mdio_mux_gpio_match,
93 .probe = mdio_mux_gpio_probe,
94 .remove = mdio_mux_gpio_remove,
97 module_platform_driver(mdio_mux_gpio_driver);
99 MODULE_DESCRIPTION(DRV_DESCRIPTION);
100 MODULE_VERSION(DRV_VERSION);
101 MODULE_AUTHOR("David Daney");
102 MODULE_LICENSE("GPL");