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1802d0be | 1 | // SPDX-License-Identifier: GPL-2.0-only |
38b1a3c6 | 2 | /* |
e52817fa RQ |
3 | * drivers/extcon/extcon-usb-gpio.c - USB GPIO extcon driver |
4 | * | |
f6dfb3c9 | 5 | * Copyright (C) 2015 Texas Instruments Incorporated - https://www.ti.com |
e52817fa | 6 | * Author: Roger Quadros <rogerq@ti.com> |
e52817fa RQ |
7 | */ |
8 | ||
176aa360 | 9 | #include <linux/extcon-provider.h> |
638f958b | 10 | #include <linux/gpio/consumer.h> |
e52817fa RQ |
11 | #include <linux/init.h> |
12 | #include <linux/interrupt.h> | |
13 | #include <linux/irq.h> | |
14 | #include <linux/kernel.h> | |
15 | #include <linux/module.h> | |
e52817fa RQ |
16 | #include <linux/platform_device.h> |
17 | #include <linux/slab.h> | |
18 | #include <linux/workqueue.h> | |
bcb7440e | 19 | #include <linux/pinctrl/consumer.h> |
57869c11 | 20 | #include <linux/mod_devicetable.h> |
e52817fa RQ |
21 | |
22 | #define USB_GPIO_DEBOUNCE_MS 20 /* ms */ | |
23 | ||
24 | struct usb_extcon_info { | |
25 | struct device *dev; | |
26 | struct extcon_dev *edev; | |
27 | ||
28 | struct gpio_desc *id_gpiod; | |
541332a1 | 29 | struct gpio_desc *vbus_gpiod; |
e52817fa | 30 | int id_irq; |
541332a1 | 31 | int vbus_irq; |
e52817fa RQ |
32 | |
33 | unsigned long debounce_jiffies; | |
34 | struct delayed_work wq_detcable; | |
35 | }; | |
36 | ||
73b6ecdb | 37 | static const unsigned int usb_extcon_cable[] = { |
2a9de9c0 CC |
38 | EXTCON_USB, |
39 | EXTCON_USB_HOST, | |
40 | EXTCON_NONE, | |
e52817fa RQ |
41 | }; |
42 | ||
541332a1 RQ |
43 | /* |
44 | * "USB" = VBUS and "USB-HOST" = !ID, so we have: | |
45 | * Both "USB" and "USB-HOST" can't be set as active at the | |
46 | * same time so if "USB-HOST" is active (i.e. ID is 0) we keep "USB" inactive | |
47 | * even if VBUS is on. | |
48 | * | |
49 | * State | ID | VBUS | |
50 | * ---------------------------------------- | |
51 | * [1] USB | H | H | |
52 | * [2] none | H | L | |
53 | * [3] USB-HOST | L | H | |
54 | * [4] USB-HOST | L | L | |
55 | * | |
56 | * In case we have only one of these signals: | |
57 | * - VBUS only - we want to distinguish between [1] and [2], so ID is always 1. | |
58 | * - ID only - we want to distinguish between [1] and [4], so VBUS = ID. | |
59 | */ | |
e52817fa RQ |
60 | static void usb_extcon_detect_cable(struct work_struct *work) |
61 | { | |
541332a1 | 62 | int id, vbus; |
e52817fa RQ |
63 | struct usb_extcon_info *info = container_of(to_delayed_work(work), |
64 | struct usb_extcon_info, | |
65 | wq_detcable); | |
66 | ||
541332a1 RQ |
67 | /* check ID and VBUS and update cable state */ |
68 | id = info->id_gpiod ? | |
69 | gpiod_get_value_cansleep(info->id_gpiod) : 1; | |
70 | vbus = info->vbus_gpiod ? | |
71 | gpiod_get_value_cansleep(info->vbus_gpiod) : id; | |
72 | ||
73 | /* at first we clean states which are no longer active */ | |
74 | if (id) | |
8670b459 | 75 | extcon_set_state_sync(info->edev, EXTCON_USB_HOST, false); |
541332a1 | 76 | if (!vbus) |
8670b459 | 77 | extcon_set_state_sync(info->edev, EXTCON_USB, false); |
541332a1 RQ |
78 | |
79 | if (!id) { | |
8670b459 | 80 | extcon_set_state_sync(info->edev, EXTCON_USB_HOST, true); |
541332a1 RQ |
81 | } else { |
82 | if (vbus) | |
83 | extcon_set_state_sync(info->edev, EXTCON_USB, true); | |
e52817fa RQ |
84 | } |
85 | } | |
86 | ||
87 | static irqreturn_t usb_irq_handler(int irq, void *dev_id) | |
88 | { | |
89 | struct usb_extcon_info *info = dev_id; | |
90 | ||
91 | queue_delayed_work(system_power_efficient_wq, &info->wq_detcable, | |
92 | info->debounce_jiffies); | |
93 | ||
94 | return IRQ_HANDLED; | |
95 | } | |
96 | ||
97 | static int usb_extcon_probe(struct platform_device *pdev) | |
98 | { | |
99 | struct device *dev = &pdev->dev; | |
100 | struct device_node *np = dev->of_node; | |
101 | struct usb_extcon_info *info; | |
102 | int ret; | |
103 | ||
366380cd | 104 | if (!np) |
e52817fa RQ |
105 | return -EINVAL; |
106 | ||
107 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); | |
108 | if (!info) | |
109 | return -ENOMEM; | |
110 | ||
111 | info->dev = dev; | |
541332a1 RQ |
112 | info->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id", GPIOD_IN); |
113 | info->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus", | |
114 | GPIOD_IN); | |
115 | ||
116 | if (!info->id_gpiod && !info->vbus_gpiod) { | |
117 | dev_err(dev, "failed to get gpios\n"); | |
118 | return -ENODEV; | |
e52817fa RQ |
119 | } |
120 | ||
541332a1 RQ |
121 | if (IS_ERR(info->id_gpiod)) |
122 | return PTR_ERR(info->id_gpiod); | |
123 | ||
124 | if (IS_ERR(info->vbus_gpiod)) | |
125 | return PTR_ERR(info->vbus_gpiod); | |
126 | ||
bc1aabad RB |
127 | info->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable); |
128 | if (IS_ERR(info->edev)) { | |
129 | dev_err(dev, "failed to allocate extcon device\n"); | |
130 | return -ENOMEM; | |
131 | } | |
132 | ||
133 | ret = devm_extcon_dev_register(dev, info->edev); | |
134 | if (ret < 0) { | |
135 | dev_err(dev, "failed to register extcon device\n"); | |
136 | return ret; | |
137 | } | |
138 | ||
541332a1 RQ |
139 | if (info->id_gpiod) |
140 | ret = gpiod_set_debounce(info->id_gpiod, | |
141 | USB_GPIO_DEBOUNCE_MS * 1000); | |
142 | if (!ret && info->vbus_gpiod) | |
143 | ret = gpiod_set_debounce(info->vbus_gpiod, | |
144 | USB_GPIO_DEBOUNCE_MS * 1000); | |
145 | ||
e52817fa RQ |
146 | if (ret < 0) |
147 | info->debounce_jiffies = msecs_to_jiffies(USB_GPIO_DEBOUNCE_MS); | |
148 | ||
149 | INIT_DELAYED_WORK(&info->wq_detcable, usb_extcon_detect_cable); | |
150 | ||
541332a1 RQ |
151 | if (info->id_gpiod) { |
152 | info->id_irq = gpiod_to_irq(info->id_gpiod); | |
153 | if (info->id_irq < 0) { | |
154 | dev_err(dev, "failed to get ID IRQ\n"); | |
155 | return info->id_irq; | |
156 | } | |
157 | ||
158 | ret = devm_request_threaded_irq(dev, info->id_irq, NULL, | |
159 | usb_irq_handler, | |
160 | IRQF_TRIGGER_RISING | | |
161 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
162 | pdev->name, info); | |
163 | if (ret < 0) { | |
164 | dev_err(dev, "failed to request handler for ID IRQ\n"); | |
165 | return ret; | |
166 | } | |
e52817fa RQ |
167 | } |
168 | ||
541332a1 RQ |
169 | if (info->vbus_gpiod) { |
170 | info->vbus_irq = gpiod_to_irq(info->vbus_gpiod); | |
171 | if (info->vbus_irq < 0) { | |
172 | dev_err(dev, "failed to get VBUS IRQ\n"); | |
173 | return info->vbus_irq; | |
174 | } | |
175 | ||
176 | ret = devm_request_threaded_irq(dev, info->vbus_irq, NULL, | |
177 | usb_irq_handler, | |
178 | IRQF_TRIGGER_RISING | | |
179 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
180 | pdev->name, info); | |
181 | if (ret < 0) { | |
182 | dev_err(dev, "failed to request handler for VBUS IRQ\n"); | |
183 | return ret; | |
184 | } | |
e52817fa RQ |
185 | } |
186 | ||
e52817fa | 187 | platform_set_drvdata(pdev, info); |
98fd0792 | 188 | device_set_wakeup_capable(&pdev->dev, true); |
e52817fa RQ |
189 | |
190 | /* Perform initial detection */ | |
191 | usb_extcon_detect_cable(&info->wq_detcable.work); | |
192 | ||
193 | return 0; | |
194 | } | |
195 | ||
196 | static int usb_extcon_remove(struct platform_device *pdev) | |
197 | { | |
198 | struct usb_extcon_info *info = platform_get_drvdata(pdev); | |
199 | ||
200 | cancel_delayed_work_sync(&info->wq_detcable); | |
12bd0f32 GS |
201 | device_init_wakeup(&pdev->dev, false); |
202 | ||
e52817fa RQ |
203 | return 0; |
204 | } | |
205 | ||
206 | #ifdef CONFIG_PM_SLEEP | |
207 | static int usb_extcon_suspend(struct device *dev) | |
208 | { | |
209 | struct usb_extcon_info *info = dev_get_drvdata(dev); | |
210 | int ret = 0; | |
211 | ||
541332a1 RQ |
212 | if (device_may_wakeup(dev)) { |
213 | if (info->id_gpiod) { | |
214 | ret = enable_irq_wake(info->id_irq); | |
215 | if (ret) | |
216 | return ret; | |
217 | } | |
218 | if (info->vbus_gpiod) { | |
219 | ret = enable_irq_wake(info->vbus_irq); | |
220 | if (ret) { | |
221 | if (info->id_gpiod) | |
222 | disable_irq_wake(info->id_irq); | |
223 | ||
224 | return ret; | |
225 | } | |
226 | } | |
227 | } | |
228 | ||
bcb7440e PC |
229 | if (!device_may_wakeup(dev)) |
230 | pinctrl_pm_select_sleep_state(dev); | |
231 | ||
e52817fa RQ |
232 | return ret; |
233 | } | |
234 | ||
235 | static int usb_extcon_resume(struct device *dev) | |
236 | { | |
237 | struct usb_extcon_info *info = dev_get_drvdata(dev); | |
238 | int ret = 0; | |
239 | ||
bcb7440e PC |
240 | if (!device_may_wakeup(dev)) |
241 | pinctrl_pm_select_default_state(dev); | |
242 | ||
541332a1 RQ |
243 | if (device_may_wakeup(dev)) { |
244 | if (info->id_gpiod) { | |
245 | ret = disable_irq_wake(info->id_irq); | |
246 | if (ret) | |
247 | return ret; | |
248 | } | |
249 | if (info->vbus_gpiod) { | |
250 | ret = disable_irq_wake(info->vbus_irq); | |
251 | if (ret) { | |
252 | if (info->id_gpiod) | |
253 | enable_irq_wake(info->id_irq); | |
254 | ||
255 | return ret; | |
256 | } | |
257 | } | |
258 | } | |
259 | ||
8680b4d1 RQ |
260 | queue_delayed_work(system_power_efficient_wq, |
261 | &info->wq_detcable, 0); | |
e52817fa RQ |
262 | |
263 | return ret; | |
264 | } | |
265 | #endif | |
266 | ||
267 | static SIMPLE_DEV_PM_OPS(usb_extcon_pm_ops, | |
268 | usb_extcon_suspend, usb_extcon_resume); | |
269 | ||
34825e51 | 270 | static const struct of_device_id usb_extcon_dt_match[] = { |
e52817fa RQ |
271 | { .compatible = "linux,extcon-usb-gpio", }, |
272 | { /* sentinel */ } | |
273 | }; | |
274 | MODULE_DEVICE_TABLE(of, usb_extcon_dt_match); | |
275 | ||
058b6659 LB |
276 | static const struct platform_device_id usb_extcon_platform_ids[] = { |
277 | { .name = "extcon-usb-gpio", }, | |
278 | { /* sentinel */ } | |
279 | }; | |
280 | MODULE_DEVICE_TABLE(platform, usb_extcon_platform_ids); | |
281 | ||
e52817fa RQ |
282 | static struct platform_driver usb_extcon_driver = { |
283 | .probe = usb_extcon_probe, | |
284 | .remove = usb_extcon_remove, | |
285 | .driver = { | |
286 | .name = "extcon-usb-gpio", | |
287 | .pm = &usb_extcon_pm_ops, | |
288 | .of_match_table = usb_extcon_dt_match, | |
289 | }, | |
058b6659 | 290 | .id_table = usb_extcon_platform_ids, |
e52817fa RQ |
291 | }; |
292 | ||
293 | module_platform_driver(usb_extcon_driver); | |
294 | ||
295 | MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>"); | |
296 | MODULE_DESCRIPTION("USB GPIO extcon driver"); | |
297 | MODULE_LICENSE("GPL v2"); |