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1802d0be | 1 | // SPDX-License-Identifier: GPL-2.0-only |
e52817fa RQ |
2 | /** |
3 | * drivers/extcon/extcon-usb-gpio.c - USB GPIO extcon driver | |
4 | * | |
5 | * Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com | |
6 | * Author: Roger Quadros <rogerq@ti.com> | |
e52817fa RQ |
7 | */ |
8 | ||
176aa360 | 9 | #include <linux/extcon-provider.h> |
92b7cb5d | 10 | #include <linux/gpio.h> |
638f958b | 11 | #include <linux/gpio/consumer.h> |
e52817fa RQ |
12 | #include <linux/init.h> |
13 | #include <linux/interrupt.h> | |
14 | #include <linux/irq.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/of_gpio.h> | |
18 | #include <linux/platform_device.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/workqueue.h> | |
bcb7440e | 21 | #include <linux/pinctrl/consumer.h> |
e52817fa RQ |
22 | |
23 | #define USB_GPIO_DEBOUNCE_MS 20 /* ms */ | |
24 | ||
25 | struct usb_extcon_info { | |
26 | struct device *dev; | |
27 | struct extcon_dev *edev; | |
28 | ||
29 | struct gpio_desc *id_gpiod; | |
541332a1 | 30 | struct gpio_desc *vbus_gpiod; |
e52817fa | 31 | int id_irq; |
541332a1 | 32 | int vbus_irq; |
e52817fa RQ |
33 | |
34 | unsigned long debounce_jiffies; | |
35 | struct delayed_work wq_detcable; | |
36 | }; | |
37 | ||
73b6ecdb | 38 | static const unsigned int usb_extcon_cable[] = { |
2a9de9c0 CC |
39 | EXTCON_USB, |
40 | EXTCON_USB_HOST, | |
41 | EXTCON_NONE, | |
e52817fa RQ |
42 | }; |
43 | ||
541332a1 RQ |
44 | /* |
45 | * "USB" = VBUS and "USB-HOST" = !ID, so we have: | |
46 | * Both "USB" and "USB-HOST" can't be set as active at the | |
47 | * same time so if "USB-HOST" is active (i.e. ID is 0) we keep "USB" inactive | |
48 | * even if VBUS is on. | |
49 | * | |
50 | * State | ID | VBUS | |
51 | * ---------------------------------------- | |
52 | * [1] USB | H | H | |
53 | * [2] none | H | L | |
54 | * [3] USB-HOST | L | H | |
55 | * [4] USB-HOST | L | L | |
56 | * | |
57 | * In case we have only one of these signals: | |
58 | * - VBUS only - we want to distinguish between [1] and [2], so ID is always 1. | |
59 | * - ID only - we want to distinguish between [1] and [4], so VBUS = ID. | |
60 | */ | |
e52817fa RQ |
61 | static void usb_extcon_detect_cable(struct work_struct *work) |
62 | { | |
541332a1 | 63 | int id, vbus; |
e52817fa RQ |
64 | struct usb_extcon_info *info = container_of(to_delayed_work(work), |
65 | struct usb_extcon_info, | |
66 | wq_detcable); | |
67 | ||
541332a1 RQ |
68 | /* check ID and VBUS and update cable state */ |
69 | id = info->id_gpiod ? | |
70 | gpiod_get_value_cansleep(info->id_gpiod) : 1; | |
71 | vbus = info->vbus_gpiod ? | |
72 | gpiod_get_value_cansleep(info->vbus_gpiod) : id; | |
73 | ||
74 | /* at first we clean states which are no longer active */ | |
75 | if (id) | |
8670b459 | 76 | extcon_set_state_sync(info->edev, EXTCON_USB_HOST, false); |
541332a1 | 77 | if (!vbus) |
8670b459 | 78 | extcon_set_state_sync(info->edev, EXTCON_USB, false); |
541332a1 RQ |
79 | |
80 | if (!id) { | |
8670b459 | 81 | extcon_set_state_sync(info->edev, EXTCON_USB_HOST, true); |
541332a1 RQ |
82 | } else { |
83 | if (vbus) | |
84 | extcon_set_state_sync(info->edev, EXTCON_USB, true); | |
e52817fa RQ |
85 | } |
86 | } | |
87 | ||
88 | static irqreturn_t usb_irq_handler(int irq, void *dev_id) | |
89 | { | |
90 | struct usb_extcon_info *info = dev_id; | |
91 | ||
92 | queue_delayed_work(system_power_efficient_wq, &info->wq_detcable, | |
93 | info->debounce_jiffies); | |
94 | ||
95 | return IRQ_HANDLED; | |
96 | } | |
97 | ||
98 | static int usb_extcon_probe(struct platform_device *pdev) | |
99 | { | |
100 | struct device *dev = &pdev->dev; | |
101 | struct device_node *np = dev->of_node; | |
102 | struct usb_extcon_info *info; | |
103 | int ret; | |
104 | ||
366380cd | 105 | if (!np) |
e52817fa RQ |
106 | return -EINVAL; |
107 | ||
108 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); | |
109 | if (!info) | |
110 | return -ENOMEM; | |
111 | ||
112 | info->dev = dev; | |
541332a1 RQ |
113 | info->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id", GPIOD_IN); |
114 | info->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus", | |
115 | GPIOD_IN); | |
116 | ||
117 | if (!info->id_gpiod && !info->vbus_gpiod) { | |
118 | dev_err(dev, "failed to get gpios\n"); | |
119 | return -ENODEV; | |
e52817fa RQ |
120 | } |
121 | ||
541332a1 RQ |
122 | if (IS_ERR(info->id_gpiod)) |
123 | return PTR_ERR(info->id_gpiod); | |
124 | ||
125 | if (IS_ERR(info->vbus_gpiod)) | |
126 | return PTR_ERR(info->vbus_gpiod); | |
127 | ||
bc1aabad RB |
128 | info->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable); |
129 | if (IS_ERR(info->edev)) { | |
130 | dev_err(dev, "failed to allocate extcon device\n"); | |
131 | return -ENOMEM; | |
132 | } | |
133 | ||
134 | ret = devm_extcon_dev_register(dev, info->edev); | |
135 | if (ret < 0) { | |
136 | dev_err(dev, "failed to register extcon device\n"); | |
137 | return ret; | |
138 | } | |
139 | ||
541332a1 RQ |
140 | if (info->id_gpiod) |
141 | ret = gpiod_set_debounce(info->id_gpiod, | |
142 | USB_GPIO_DEBOUNCE_MS * 1000); | |
143 | if (!ret && info->vbus_gpiod) | |
144 | ret = gpiod_set_debounce(info->vbus_gpiod, | |
145 | USB_GPIO_DEBOUNCE_MS * 1000); | |
146 | ||
e52817fa RQ |
147 | if (ret < 0) |
148 | info->debounce_jiffies = msecs_to_jiffies(USB_GPIO_DEBOUNCE_MS); | |
149 | ||
150 | INIT_DELAYED_WORK(&info->wq_detcable, usb_extcon_detect_cable); | |
151 | ||
541332a1 RQ |
152 | if (info->id_gpiod) { |
153 | info->id_irq = gpiod_to_irq(info->id_gpiod); | |
154 | if (info->id_irq < 0) { | |
155 | dev_err(dev, "failed to get ID IRQ\n"); | |
156 | return info->id_irq; | |
157 | } | |
158 | ||
159 | ret = devm_request_threaded_irq(dev, info->id_irq, NULL, | |
160 | usb_irq_handler, | |
161 | IRQF_TRIGGER_RISING | | |
162 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
163 | pdev->name, info); | |
164 | if (ret < 0) { | |
165 | dev_err(dev, "failed to request handler for ID IRQ\n"); | |
166 | return ret; | |
167 | } | |
e52817fa RQ |
168 | } |
169 | ||
541332a1 RQ |
170 | if (info->vbus_gpiod) { |
171 | info->vbus_irq = gpiod_to_irq(info->vbus_gpiod); | |
172 | if (info->vbus_irq < 0) { | |
173 | dev_err(dev, "failed to get VBUS IRQ\n"); | |
174 | return info->vbus_irq; | |
175 | } | |
176 | ||
177 | ret = devm_request_threaded_irq(dev, info->vbus_irq, NULL, | |
178 | usb_irq_handler, | |
179 | IRQF_TRIGGER_RISING | | |
180 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
181 | pdev->name, info); | |
182 | if (ret < 0) { | |
183 | dev_err(dev, "failed to request handler for VBUS IRQ\n"); | |
184 | return ret; | |
185 | } | |
e52817fa RQ |
186 | } |
187 | ||
e52817fa | 188 | platform_set_drvdata(pdev, info); |
98fd0792 | 189 | device_set_wakeup_capable(&pdev->dev, true); |
e52817fa RQ |
190 | |
191 | /* Perform initial detection */ | |
192 | usb_extcon_detect_cable(&info->wq_detcable.work); | |
193 | ||
194 | return 0; | |
195 | } | |
196 | ||
197 | static int usb_extcon_remove(struct platform_device *pdev) | |
198 | { | |
199 | struct usb_extcon_info *info = platform_get_drvdata(pdev); | |
200 | ||
201 | cancel_delayed_work_sync(&info->wq_detcable); | |
12bd0f32 GS |
202 | device_init_wakeup(&pdev->dev, false); |
203 | ||
e52817fa RQ |
204 | return 0; |
205 | } | |
206 | ||
207 | #ifdef CONFIG_PM_SLEEP | |
208 | static int usb_extcon_suspend(struct device *dev) | |
209 | { | |
210 | struct usb_extcon_info *info = dev_get_drvdata(dev); | |
211 | int ret = 0; | |
212 | ||
541332a1 RQ |
213 | if (device_may_wakeup(dev)) { |
214 | if (info->id_gpiod) { | |
215 | ret = enable_irq_wake(info->id_irq); | |
216 | if (ret) | |
217 | return ret; | |
218 | } | |
219 | if (info->vbus_gpiod) { | |
220 | ret = enable_irq_wake(info->vbus_irq); | |
221 | if (ret) { | |
222 | if (info->id_gpiod) | |
223 | disable_irq_wake(info->id_irq); | |
224 | ||
225 | return ret; | |
226 | } | |
227 | } | |
228 | } | |
229 | ||
e52817fa RQ |
230 | /* |
231 | * We don't want to process any IRQs after this point | |
232 | * as GPIOs used behind I2C subsystem might not be | |
233 | * accessible until resume completes. So disable IRQ. | |
234 | */ | |
541332a1 RQ |
235 | if (info->id_gpiod) |
236 | disable_irq(info->id_irq); | |
237 | if (info->vbus_gpiod) | |
238 | disable_irq(info->vbus_irq); | |
e52817fa | 239 | |
bcb7440e PC |
240 | if (!device_may_wakeup(dev)) |
241 | pinctrl_pm_select_sleep_state(dev); | |
242 | ||
e52817fa RQ |
243 | return ret; |
244 | } | |
245 | ||
246 | static int usb_extcon_resume(struct device *dev) | |
247 | { | |
248 | struct usb_extcon_info *info = dev_get_drvdata(dev); | |
249 | int ret = 0; | |
250 | ||
bcb7440e PC |
251 | if (!device_may_wakeup(dev)) |
252 | pinctrl_pm_select_default_state(dev); | |
253 | ||
541332a1 RQ |
254 | if (device_may_wakeup(dev)) { |
255 | if (info->id_gpiod) { | |
256 | ret = disable_irq_wake(info->id_irq); | |
257 | if (ret) | |
258 | return ret; | |
259 | } | |
260 | if (info->vbus_gpiod) { | |
261 | ret = disable_irq_wake(info->vbus_irq); | |
262 | if (ret) { | |
263 | if (info->id_gpiod) | |
264 | enable_irq_wake(info->id_irq); | |
265 | ||
266 | return ret; | |
267 | } | |
268 | } | |
269 | } | |
270 | ||
271 | if (info->id_gpiod) | |
272 | enable_irq(info->id_irq); | |
273 | if (info->vbus_gpiod) | |
274 | enable_irq(info->vbus_irq); | |
275 | ||
8680b4d1 RQ |
276 | queue_delayed_work(system_power_efficient_wq, |
277 | &info->wq_detcable, 0); | |
e52817fa RQ |
278 | |
279 | return ret; | |
280 | } | |
281 | #endif | |
282 | ||
283 | static SIMPLE_DEV_PM_OPS(usb_extcon_pm_ops, | |
284 | usb_extcon_suspend, usb_extcon_resume); | |
285 | ||
34825e51 | 286 | static const struct of_device_id usb_extcon_dt_match[] = { |
e52817fa RQ |
287 | { .compatible = "linux,extcon-usb-gpio", }, |
288 | { /* sentinel */ } | |
289 | }; | |
290 | MODULE_DEVICE_TABLE(of, usb_extcon_dt_match); | |
291 | ||
058b6659 LB |
292 | static const struct platform_device_id usb_extcon_platform_ids[] = { |
293 | { .name = "extcon-usb-gpio", }, | |
294 | { /* sentinel */ } | |
295 | }; | |
296 | MODULE_DEVICE_TABLE(platform, usb_extcon_platform_ids); | |
297 | ||
e52817fa RQ |
298 | static struct platform_driver usb_extcon_driver = { |
299 | .probe = usb_extcon_probe, | |
300 | .remove = usb_extcon_remove, | |
301 | .driver = { | |
302 | .name = "extcon-usb-gpio", | |
303 | .pm = &usb_extcon_pm_ops, | |
304 | .of_match_table = usb_extcon_dt_match, | |
305 | }, | |
058b6659 | 306 | .id_table = usb_extcon_platform_ids, |
e52817fa RQ |
307 | }; |
308 | ||
309 | module_platform_driver(usb_extcon_driver); | |
310 | ||
311 | MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>"); | |
312 | MODULE_DESCRIPTION("USB GPIO extcon driver"); | |
313 | MODULE_LICENSE("GPL v2"); |