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416912a1 DD |
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> | |
416912a1 DD |
13 | #include <linux/phy.h> |
14 | #include <linux/mdio-mux.h> | |
33df10e2 | 15 | #include <linux/gpio/consumer.h> |
416912a1 | 16 | |
441e0026 | 17 | #define DRV_VERSION "1.1" |
416912a1 DD |
18 | #define DRV_DESCRIPTION "GPIO controlled MDIO bus multiplexer driver" |
19 | ||
416912a1 | 20 | struct mdio_mux_gpio_state { |
33df10e2 | 21 | struct gpio_descs *gpios; |
416912a1 DD |
22 | void *mux_handle; |
23 | }; | |
24 | ||
25 | static int mdio_mux_gpio_switch_fn(int current_child, int desired_child, | |
26 | void *data) | |
27 | { | |
416912a1 | 28 | struct mdio_mux_gpio_state *s = data; |
33df10e2 RI |
29 | int values[s->gpios->ndescs]; |
30 | unsigned int n; | |
416912a1 DD |
31 | |
32 | if (current_child == desired_child) | |
33 | return 0; | |
34 | ||
33df10e2 | 35 | for (n = 0; n < s->gpios->ndescs; n++) |
441e0026 | 36 | values[n] = (desired_child >> n) & 1; |
33df10e2 | 37 | |
3fff99bc RI |
38 | gpiod_set_array_value_cansleep(s->gpios->ndescs, s->gpios->desc, |
39 | values); | |
416912a1 DD |
40 | |
41 | return 0; | |
42 | } | |
43 | ||
633d1594 | 44 | static int mdio_mux_gpio_probe(struct platform_device *pdev) |
416912a1 | 45 | { |
416912a1 | 46 | struct mdio_mux_gpio_state *s; |
416912a1 DD |
47 | int r; |
48 | ||
416912a1 DD |
49 | s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL); |
50 | if (!s) | |
51 | return -ENOMEM; | |
52 | ||
33df10e2 RI |
53 | s->gpios = gpiod_get_array(&pdev->dev, NULL, GPIOD_OUT_LOW); |
54 | if (IS_ERR(s->gpios)) | |
55 | return PTR_ERR(s->gpios); | |
416912a1 DD |
56 | |
57 | r = mdio_mux_init(&pdev->dev, | |
58 | mdio_mux_gpio_switch_fn, &s->mux_handle, s); | |
59 | ||
33df10e2 RI |
60 | if (r != 0) { |
61 | gpiod_put_array(s->gpios); | |
62 | return r; | |
416912a1 | 63 | } |
33df10e2 RI |
64 | |
65 | pdev->dev.platform_data = s; | |
66 | return 0; | |
416912a1 DD |
67 | } |
68 | ||
633d1594 | 69 | static int mdio_mux_gpio_remove(struct platform_device *pdev) |
416912a1 | 70 | { |
1b0e53a8 | 71 | struct mdio_mux_gpio_state *s = dev_get_platdata(&pdev->dev); |
416912a1 | 72 | mdio_mux_uninit(s->mux_handle); |
33df10e2 | 73 | gpiod_put_array(s->gpios); |
416912a1 DD |
74 | return 0; |
75 | } | |
76 | ||
d8a7dadb | 77 | static const struct of_device_id mdio_mux_gpio_match[] = { |
416912a1 DD |
78 | { |
79 | .compatible = "mdio-mux-gpio", | |
80 | }, | |
81 | { | |
82 | /* Legacy compatible property. */ | |
83 | .compatible = "cavium,mdio-mux-sn74cbtlv3253", | |
84 | }, | |
85 | {}, | |
86 | }; | |
87 | MODULE_DEVICE_TABLE(of, mdio_mux_gpio_match); | |
88 | ||
89 | static struct platform_driver mdio_mux_gpio_driver = { | |
90 | .driver = { | |
91 | .name = "mdio-mux-gpio", | |
416912a1 DD |
92 | .of_match_table = mdio_mux_gpio_match, |
93 | }, | |
94 | .probe = mdio_mux_gpio_probe, | |
633d1594 | 95 | .remove = mdio_mux_gpio_remove, |
416912a1 DD |
96 | }; |
97 | ||
98 | module_platform_driver(mdio_mux_gpio_driver); | |
99 | ||
100 | MODULE_DESCRIPTION(DRV_DESCRIPTION); | |
101 | MODULE_VERSION(DRV_VERSION); | |
102 | MODULE_AUTHOR("David Daney"); | |
103 | MODULE_LICENSE("GPL"); |