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