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 DECLARE_BITMAP(values, BITS_PER_TYPE(desired_child));
31 if (current_child == desired_child)
34 values[0] = desired_child;
36 gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
37 s->gpios->info, values);
42 static int mdio_mux_gpio_probe(struct platform_device *pdev)
44 struct mdio_mux_gpio_state *s;
45 struct gpio_descs *gpios;
48 gpios = gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW);
50 return PTR_ERR(gpios);
52 s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
54 gpiod_put_array(gpios);
60 r = mdio_mux_init(&pdev->dev, pdev->dev.of_node,
61 mdio_mux_gpio_switch_fn, &s->mux_handle, s, NULL);
64 gpiod_put_array(s->gpios);
68 pdev->dev.platform_data = s;
72 static int mdio_mux_gpio_remove(struct platform_device *pdev)
74 struct mdio_mux_gpio_state *s = dev_get_platdata(&pdev->dev);
75 mdio_mux_uninit(s->mux_handle);
76 gpiod_put_array(s->gpios);
80 static const struct of_device_id mdio_mux_gpio_match[] = {
82 .compatible = "mdio-mux-gpio",
85 /* Legacy compatible property. */
86 .compatible = "cavium,mdio-mux-sn74cbtlv3253",
90 MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match);
92 static struct platform_driver mdio_mux_gpio_driver = {
94 .name = "mdio-mux-gpio",
95 .of_match_table = mdio_mux_gpio_match,
97 .probe = mdio_mux_gpio_probe,
98 .remove = mdio_mux_gpio_remove,
101 module_platform_driver(mdio_mux_gpio_driver);
103 MODULE_DESCRIPTION(DRV_DESCRIPTION);
104 MODULE_VERSION(DRV_VERSION);
105 MODULE_AUTHOR("David Daney");
106 MODULE_LICENSE("GPL");