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ac1dc6b2 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
08a0a4f9 SS |
2 | /* |
3 | * Maxim Integrated MAX3355 USB OTG chip extcon driver | |
4 | * | |
5 | * Copyright (C) 2014-2015 Cogent Embedded, Inc. | |
6 | * Author: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> | |
08a0a4f9 SS |
7 | */ |
8 | ||
176aa360 | 9 | #include <linux/extcon-provider.h> |
08a0a4f9 SS |
10 | #include <linux/gpio/consumer.h> |
11 | #include <linux/interrupt.h> | |
12 | #include <linux/module.h> | |
c9c159b2 | 13 | #include <linux/mod_devicetable.h> |
08a0a4f9 SS |
14 | #include <linux/platform_device.h> |
15 | ||
16 | struct max3355_data { | |
17 | struct extcon_dev *edev; | |
18 | struct gpio_desc *id_gpiod; | |
19 | struct gpio_desc *shdn_gpiod; | |
20 | }; | |
21 | ||
22 | static const unsigned int max3355_cable[] = { | |
23 | EXTCON_USB, | |
24 | EXTCON_USB_HOST, | |
25 | EXTCON_NONE, | |
26 | }; | |
27 | ||
28 | static irqreturn_t max3355_id_irq(int irq, void *dev_id) | |
29 | { | |
30 | struct max3355_data *data = dev_id; | |
31 | int id = gpiod_get_value_cansleep(data->id_gpiod); | |
32 | ||
33 | if (id) { | |
34 | /* | |
35 | * ID = 1 means USB HOST cable detached. | |
36 | * As we don't have event for USB peripheral cable attached, | |
37 | * we simulate USB peripheral attach here. | |
38 | */ | |
8670b459 CC |
39 | extcon_set_state_sync(data->edev, EXTCON_USB_HOST, false); |
40 | extcon_set_state_sync(data->edev, EXTCON_USB, true); | |
08a0a4f9 SS |
41 | } else { |
42 | /* | |
43 | * ID = 0 means USB HOST cable attached. | |
44 | * As we don't have event for USB peripheral cable detached, | |
45 | * we simulate USB peripheral detach here. | |
46 | */ | |
8670b459 CC |
47 | extcon_set_state_sync(data->edev, EXTCON_USB, false); |
48 | extcon_set_state_sync(data->edev, EXTCON_USB_HOST, true); | |
08a0a4f9 SS |
49 | } |
50 | ||
51 | return IRQ_HANDLED; | |
52 | } | |
53 | ||
54 | static int max3355_probe(struct platform_device *pdev) | |
55 | { | |
56 | struct max3355_data *data; | |
57 | struct gpio_desc *gpiod; | |
58 | int irq, err; | |
59 | ||
60 | data = devm_kzalloc(&pdev->dev, sizeof(struct max3355_data), | |
61 | GFP_KERNEL); | |
62 | if (!data) | |
63 | return -ENOMEM; | |
64 | ||
65 | gpiod = devm_gpiod_get(&pdev->dev, "id", GPIOD_IN); | |
66 | if (IS_ERR(gpiod)) { | |
67 | dev_err(&pdev->dev, "failed to get ID_OUT GPIO\n"); | |
68 | return PTR_ERR(gpiod); | |
69 | } | |
70 | data->id_gpiod = gpiod; | |
71 | ||
72 | gpiod = devm_gpiod_get(&pdev->dev, "maxim,shdn", GPIOD_OUT_HIGH); | |
73 | if (IS_ERR(gpiod)) { | |
74 | dev_err(&pdev->dev, "failed to get SHDN# GPIO\n"); | |
75 | return PTR_ERR(gpiod); | |
76 | } | |
77 | data->shdn_gpiod = gpiod; | |
78 | ||
79 | data->edev = devm_extcon_dev_allocate(&pdev->dev, max3355_cable); | |
80 | if (IS_ERR(data->edev)) { | |
81 | dev_err(&pdev->dev, "failed to allocate extcon device\n"); | |
82 | return PTR_ERR(data->edev); | |
83 | } | |
84 | ||
85 | err = devm_extcon_dev_register(&pdev->dev, data->edev); | |
86 | if (err < 0) { | |
87 | dev_err(&pdev->dev, "failed to register extcon device\n"); | |
88 | return err; | |
89 | } | |
90 | ||
91 | irq = gpiod_to_irq(data->id_gpiod); | |
92 | if (irq < 0) { | |
93 | dev_err(&pdev->dev, "failed to translate ID_OUT GPIO to IRQ\n"); | |
94 | return irq; | |
95 | } | |
96 | ||
97 | err = devm_request_threaded_irq(&pdev->dev, irq, NULL, max3355_id_irq, | |
98 | IRQF_ONESHOT | IRQF_NO_SUSPEND | | |
99 | IRQF_TRIGGER_RISING | | |
100 | IRQF_TRIGGER_FALLING, | |
101 | pdev->name, data); | |
102 | if (err < 0) { | |
103 | dev_err(&pdev->dev, "failed to request ID_OUT IRQ\n"); | |
104 | return err; | |
105 | } | |
106 | ||
107 | platform_set_drvdata(pdev, data); | |
108 | ||
109 | /* Perform initial detection */ | |
110 | max3355_id_irq(irq, data); | |
111 | ||
112 | return 0; | |
113 | } | |
114 | ||
115 | static int max3355_remove(struct platform_device *pdev) | |
116 | { | |
117 | struct max3355_data *data = platform_get_drvdata(pdev); | |
118 | ||
119 | gpiod_set_value_cansleep(data->shdn_gpiod, 0); | |
120 | ||
121 | return 0; | |
122 | } | |
123 | ||
124 | static const struct of_device_id max3355_match_table[] = { | |
125 | { .compatible = "maxim,max3355", }, | |
126 | { } | |
127 | }; | |
128 | MODULE_DEVICE_TABLE(of, max3355_match_table); | |
129 | ||
130 | static struct platform_driver max3355_driver = { | |
131 | .probe = max3355_probe, | |
132 | .remove = max3355_remove, | |
133 | .driver = { | |
134 | .name = "extcon-max3355", | |
135 | .of_match_table = max3355_match_table, | |
136 | }, | |
137 | }; | |
138 | ||
139 | module_platform_driver(max3355_driver); | |
140 | ||
141 | MODULE_AUTHOR("Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>"); | |
142 | MODULE_DESCRIPTION("Maxim MAX3355 extcon driver"); | |
143 | MODULE_LICENSE("GPL v2"); |