1a9770eacSAndrew Lunn // SPDX-License-Identifier: GPL-2.0
2a9770eacSAndrew Lunn /*
3a9770eacSAndrew Lunn * Copyright (C) 2011, 2012 Cavium, Inc.
4a9770eacSAndrew Lunn */
5a9770eacSAndrew Lunn
6a9770eacSAndrew Lunn #include <linux/device.h>
7a9770eacSAndrew Lunn #include <linux/gpio/consumer.h>
8*1bf34366SCalvin Johnson #include <linux/mdio-mux.h>
9*1bf34366SCalvin Johnson #include <linux/module.h>
10*1bf34366SCalvin Johnson #include <linux/of_mdio.h>
11*1bf34366SCalvin Johnson #include <linux/phy.h>
12*1bf34366SCalvin Johnson #include <linux/platform_device.h>
13a9770eacSAndrew Lunn
14a9770eacSAndrew Lunn #define DRV_VERSION "1.1"
15a9770eacSAndrew Lunn #define DRV_DESCRIPTION "GPIO controlled MDIO bus multiplexer driver"
16a9770eacSAndrew Lunn
17a9770eacSAndrew Lunn struct mdio_mux_gpio_state {
18a9770eacSAndrew Lunn struct gpio_descs *gpios;
19a9770eacSAndrew Lunn void *mux_handle;
20a9770eacSAndrew Lunn };
21a9770eacSAndrew Lunn
mdio_mux_gpio_switch_fn(int current_child,int desired_child,void * data)22a9770eacSAndrew Lunn static int mdio_mux_gpio_switch_fn(int current_child, int desired_child,
23a9770eacSAndrew Lunn void *data)
24a9770eacSAndrew Lunn {
25a9770eacSAndrew Lunn struct mdio_mux_gpio_state *s = data;
26a9770eacSAndrew Lunn DECLARE_BITMAP(values, BITS_PER_TYPE(desired_child));
27a9770eacSAndrew Lunn
28a9770eacSAndrew Lunn if (current_child == desired_child)
29a9770eacSAndrew Lunn return 0;
30a9770eacSAndrew Lunn
31a9770eacSAndrew Lunn values[0] = desired_child;
32a9770eacSAndrew Lunn
33a9770eacSAndrew Lunn gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc,
34a9770eacSAndrew Lunn s->gpios->info, values);
35a9770eacSAndrew Lunn
36a9770eacSAndrew Lunn return 0;
37a9770eacSAndrew Lunn }
38a9770eacSAndrew Lunn
mdio_mux_gpio_probe(struct platform_device * pdev)39a9770eacSAndrew Lunn static int mdio_mux_gpio_probe(struct platform_device *pdev)
40a9770eacSAndrew Lunn {
41a9770eacSAndrew Lunn struct mdio_mux_gpio_state *s;
42a9770eacSAndrew Lunn struct gpio_descs *gpios;
43a9770eacSAndrew Lunn int r;
44a9770eacSAndrew Lunn
45a9770eacSAndrew Lunn gpios = devm_gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW);
46a9770eacSAndrew Lunn if (IS_ERR(gpios))
47a9770eacSAndrew Lunn return PTR_ERR(gpios);
48a9770eacSAndrew Lunn
49a9770eacSAndrew Lunn s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL);
50a9770eacSAndrew Lunn if (!s)
51a9770eacSAndrew Lunn return -ENOMEM;
52a9770eacSAndrew Lunn
53a9770eacSAndrew Lunn s->gpios = gpios;
54a9770eacSAndrew Lunn
55a9770eacSAndrew Lunn r = mdio_mux_init(&pdev->dev, pdev->dev.of_node,
56a9770eacSAndrew Lunn mdio_mux_gpio_switch_fn, &s->mux_handle, s, NULL);
57a9770eacSAndrew Lunn
58a9770eacSAndrew Lunn if (r != 0)
59a9770eacSAndrew Lunn return r;
60a9770eacSAndrew Lunn
61a9770eacSAndrew Lunn pdev->dev.platform_data = s;
62a9770eacSAndrew Lunn return 0;
63a9770eacSAndrew Lunn }
64a9770eacSAndrew Lunn
mdio_mux_gpio_remove(struct platform_device * pdev)65a9770eacSAndrew Lunn static int mdio_mux_gpio_remove(struct platform_device *pdev)
66a9770eacSAndrew Lunn {
67a9770eacSAndrew Lunn struct mdio_mux_gpio_state *s = dev_get_platdata(&pdev->dev);
68a9770eacSAndrew Lunn mdio_mux_uninit(s->mux_handle);
69a9770eacSAndrew Lunn return 0;
70a9770eacSAndrew Lunn }
71a9770eacSAndrew Lunn
72a9770eacSAndrew Lunn static const struct of_device_id mdio_mux_gpio_match[] = {
73a9770eacSAndrew Lunn {
74a9770eacSAndrew Lunn .compatible = "mdio-mux-gpio",
75a9770eacSAndrew Lunn },
76a9770eacSAndrew Lunn {
77a9770eacSAndrew Lunn /* Legacy compatible property. */
78a9770eacSAndrew Lunn .compatible = "cavium,mdio-mux-sn74cbtlv3253",
79a9770eacSAndrew Lunn },
80a9770eacSAndrew Lunn {},
81a9770eacSAndrew Lunn };
82a9770eacSAndrew Lunn MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match);
83a9770eacSAndrew Lunn
84a9770eacSAndrew Lunn static struct platform_driver mdio_mux_gpio_driver = {
85a9770eacSAndrew Lunn .driver = {
86a9770eacSAndrew Lunn .name = "mdio-mux-gpio",
87a9770eacSAndrew Lunn .of_match_table = mdio_mux_gpio_match,
88a9770eacSAndrew Lunn },
89a9770eacSAndrew Lunn .probe = mdio_mux_gpio_probe,
90a9770eacSAndrew Lunn .remove = mdio_mux_gpio_remove,
91a9770eacSAndrew Lunn };
92a9770eacSAndrew Lunn
93a9770eacSAndrew Lunn module_platform_driver(mdio_mux_gpio_driver);
94a9770eacSAndrew Lunn
95a9770eacSAndrew Lunn MODULE_DESCRIPTION(DRV_DESCRIPTION);
96a9770eacSAndrew Lunn MODULE_VERSION(DRV_VERSION);
97a9770eacSAndrew Lunn MODULE_AUTHOR("David Daney");
98a9770eacSAndrew Lunn MODULE_LICENSE("GPL v2");
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