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e52817fa RQ |
1 | /** |
2 | * drivers/extcon/extcon-usb-gpio.c - USB GPIO extcon driver | |
3 | * | |
4 | * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com | |
5 | * Author: Roger Quadros <rogerq@ti.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | */ | |
16 | ||
17 | #include <linux/extcon.h> | |
92b7cb5d | 18 | #include <linux/gpio.h> |
638f958b | 19 | #include <linux/gpio/consumer.h> |
e52817fa RQ |
20 | #include <linux/init.h> |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/irq.h> | |
23 | #include <linux/kernel.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/of_gpio.h> | |
26 | #include <linux/platform_device.h> | |
12bd0f32 | 27 | #include <linux/pm_wakeirq.h> |
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28 | #include <linux/slab.h> |
29 | #include <linux/workqueue.h> | |
942c7924 | 30 | #include <linux/acpi.h> |
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31 | |
32 | #define USB_GPIO_DEBOUNCE_MS 20 /* ms */ | |
33 | ||
34 | struct usb_extcon_info { | |
35 | struct device *dev; | |
36 | struct extcon_dev *edev; | |
37 | ||
38 | struct gpio_desc *id_gpiod; | |
39 | int id_irq; | |
40 | ||
41 | unsigned long debounce_jiffies; | |
42 | struct delayed_work wq_detcable; | |
43 | }; | |
44 | ||
73b6ecdb | 45 | static const unsigned int usb_extcon_cable[] = { |
2a9de9c0 CC |
46 | EXTCON_USB, |
47 | EXTCON_USB_HOST, | |
48 | EXTCON_NONE, | |
e52817fa RQ |
49 | }; |
50 | ||
51 | static void usb_extcon_detect_cable(struct work_struct *work) | |
52 | { | |
53 | int id; | |
54 | struct usb_extcon_info *info = container_of(to_delayed_work(work), | |
55 | struct usb_extcon_info, | |
56 | wq_detcable); | |
57 | ||
58 | /* check ID and update cable state */ | |
59 | id = gpiod_get_value_cansleep(info->id_gpiod); | |
60 | if (id) { | |
61 | /* | |
62 | * ID = 1 means USB HOST cable detached. | |
63 | * As we don't have event for USB peripheral cable attached, | |
64 | * we simulate USB peripheral attach here. | |
65 | */ | |
2a9de9c0 CC |
66 | extcon_set_cable_state_(info->edev, EXTCON_USB_HOST, false); |
67 | extcon_set_cable_state_(info->edev, EXTCON_USB, true); | |
e52817fa RQ |
68 | } else { |
69 | /* | |
70 | * ID = 0 means USB HOST cable attached. | |
71 | * As we don't have event for USB peripheral cable detached, | |
72 | * we simulate USB peripheral detach here. | |
73 | */ | |
2a9de9c0 CC |
74 | extcon_set_cable_state_(info->edev, EXTCON_USB, false); |
75 | extcon_set_cable_state_(info->edev, EXTCON_USB_HOST, true); | |
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76 | } |
77 | } | |
78 | ||
79 | static irqreturn_t usb_irq_handler(int irq, void *dev_id) | |
80 | { | |
81 | struct usb_extcon_info *info = dev_id; | |
82 | ||
83 | queue_delayed_work(system_power_efficient_wq, &info->wq_detcable, | |
84 | info->debounce_jiffies); | |
85 | ||
86 | return IRQ_HANDLED; | |
87 | } | |
88 | ||
89 | static int usb_extcon_probe(struct platform_device *pdev) | |
90 | { | |
91 | struct device *dev = &pdev->dev; | |
92 | struct device_node *np = dev->of_node; | |
93 | struct usb_extcon_info *info; | |
94 | int ret; | |
95 | ||
942c7924 | 96 | if (!np && !ACPI_HANDLE(dev)) |
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97 | return -EINVAL; |
98 | ||
99 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); | |
100 | if (!info) | |
101 | return -ENOMEM; | |
102 | ||
103 | info->dev = dev; | |
35eed7a0 | 104 | info->id_gpiod = devm_gpiod_get(&pdev->dev, "id", GPIOD_IN); |
e52817fa RQ |
105 | if (IS_ERR(info->id_gpiod)) { |
106 | dev_err(dev, "failed to get ID GPIO\n"); | |
107 | return PTR_ERR(info->id_gpiod); | |
108 | } | |
109 | ||
bc1aabad RB |
110 | info->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable); |
111 | if (IS_ERR(info->edev)) { | |
112 | dev_err(dev, "failed to allocate extcon device\n"); | |
113 | return -ENOMEM; | |
114 | } | |
115 | ||
116 | ret = devm_extcon_dev_register(dev, info->edev); | |
117 | if (ret < 0) { | |
118 | dev_err(dev, "failed to register extcon device\n"); | |
119 | return ret; | |
120 | } | |
121 | ||
e52817fa RQ |
122 | ret = gpiod_set_debounce(info->id_gpiod, |
123 | USB_GPIO_DEBOUNCE_MS * 1000); | |
124 | if (ret < 0) | |
125 | info->debounce_jiffies = msecs_to_jiffies(USB_GPIO_DEBOUNCE_MS); | |
126 | ||
127 | INIT_DELAYED_WORK(&info->wq_detcable, usb_extcon_detect_cable); | |
128 | ||
129 | info->id_irq = gpiod_to_irq(info->id_gpiod); | |
130 | if (info->id_irq < 0) { | |
131 | dev_err(dev, "failed to get ID IRQ\n"); | |
132 | return info->id_irq; | |
133 | } | |
134 | ||
135 | ret = devm_request_threaded_irq(dev, info->id_irq, NULL, | |
136 | usb_irq_handler, | |
137 | IRQF_TRIGGER_RISING | | |
138 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
139 | pdev->name, info); | |
140 | if (ret < 0) { | |
141 | dev_err(dev, "failed to request handler for ID IRQ\n"); | |
142 | return ret; | |
143 | } | |
144 | ||
e52817fa | 145 | platform_set_drvdata(pdev, info); |
12bd0f32 GS |
146 | device_init_wakeup(dev, true); |
147 | dev_pm_set_wake_irq(dev, info->id_irq); | |
e52817fa RQ |
148 | |
149 | /* Perform initial detection */ | |
150 | usb_extcon_detect_cable(&info->wq_detcable.work); | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
155 | static int usb_extcon_remove(struct platform_device *pdev) | |
156 | { | |
157 | struct usb_extcon_info *info = platform_get_drvdata(pdev); | |
158 | ||
159 | cancel_delayed_work_sync(&info->wq_detcable); | |
160 | ||
12bd0f32 GS |
161 | dev_pm_clear_wake_irq(&pdev->dev); |
162 | device_init_wakeup(&pdev->dev, false); | |
163 | ||
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164 | return 0; |
165 | } | |
166 | ||
167 | #ifdef CONFIG_PM_SLEEP | |
168 | static int usb_extcon_suspend(struct device *dev) | |
169 | { | |
170 | struct usb_extcon_info *info = dev_get_drvdata(dev); | |
171 | int ret = 0; | |
172 | ||
e52817fa RQ |
173 | /* |
174 | * We don't want to process any IRQs after this point | |
175 | * as GPIOs used behind I2C subsystem might not be | |
176 | * accessible until resume completes. So disable IRQ. | |
177 | */ | |
178 | disable_irq(info->id_irq); | |
179 | ||
180 | return ret; | |
181 | } | |
182 | ||
183 | static int usb_extcon_resume(struct device *dev) | |
184 | { | |
185 | struct usb_extcon_info *info = dev_get_drvdata(dev); | |
186 | int ret = 0; | |
187 | ||
e52817fa | 188 | enable_irq(info->id_irq); |
04c08008 RQ |
189 | if (!device_may_wakeup(dev)) |
190 | queue_delayed_work(system_power_efficient_wq, | |
191 | &info->wq_detcable, 0); | |
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192 | |
193 | return ret; | |
194 | } | |
195 | #endif | |
196 | ||
197 | static SIMPLE_DEV_PM_OPS(usb_extcon_pm_ops, | |
198 | usb_extcon_suspend, usb_extcon_resume); | |
199 | ||
34825e51 | 200 | static const struct of_device_id usb_extcon_dt_match[] = { |
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201 | { .compatible = "linux,extcon-usb-gpio", }, |
202 | { /* sentinel */ } | |
203 | }; | |
204 | MODULE_DEVICE_TABLE(of, usb_extcon_dt_match); | |
205 | ||
058b6659 LB |
206 | static const struct platform_device_id usb_extcon_platform_ids[] = { |
207 | { .name = "extcon-usb-gpio", }, | |
208 | { /* sentinel */ } | |
209 | }; | |
210 | MODULE_DEVICE_TABLE(platform, usb_extcon_platform_ids); | |
211 | ||
e52817fa RQ |
212 | static struct platform_driver usb_extcon_driver = { |
213 | .probe = usb_extcon_probe, | |
214 | .remove = usb_extcon_remove, | |
215 | .driver = { | |
216 | .name = "extcon-usb-gpio", | |
217 | .pm = &usb_extcon_pm_ops, | |
218 | .of_match_table = usb_extcon_dt_match, | |
219 | }, | |
058b6659 | 220 | .id_table = usb_extcon_platform_ids, |
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221 | }; |
222 | ||
223 | module_platform_driver(usb_extcon_driver); | |
224 | ||
225 | MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>"); | |
226 | MODULE_DESCRIPTION("USB GPIO extcon driver"); | |
227 | MODULE_LICENSE("GPL v2"); |