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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 | ||
176aa360 | 17 | #include <linux/extcon-provider.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> | |
27 | #include <linux/slab.h> | |
28 | #include <linux/workqueue.h> | |
bcb7440e | 29 | #include <linux/pinctrl/consumer.h> |
e52817fa RQ |
30 | |
31 | #define USB_GPIO_DEBOUNCE_MS 20 /* ms */ | |
32 | ||
33 | struct usb_extcon_info { | |
34 | struct device *dev; | |
35 | struct extcon_dev *edev; | |
36 | ||
37 | struct gpio_desc *id_gpiod; | |
541332a1 | 38 | struct gpio_desc *vbus_gpiod; |
e52817fa | 39 | int id_irq; |
541332a1 | 40 | int vbus_irq; |
e52817fa RQ |
41 | |
42 | unsigned long debounce_jiffies; | |
43 | struct delayed_work wq_detcable; | |
44 | }; | |
45 | ||
73b6ecdb | 46 | static const unsigned int usb_extcon_cable[] = { |
2a9de9c0 CC |
47 | EXTCON_USB, |
48 | EXTCON_USB_HOST, | |
49 | EXTCON_NONE, | |
e52817fa RQ |
50 | }; |
51 | ||
541332a1 RQ |
52 | /* |
53 | * "USB" = VBUS and "USB-HOST" = !ID, so we have: | |
54 | * Both "USB" and "USB-HOST" can't be set as active at the | |
55 | * same time so if "USB-HOST" is active (i.e. ID is 0) we keep "USB" inactive | |
56 | * even if VBUS is on. | |
57 | * | |
58 | * State | ID | VBUS | |
59 | * ---------------------------------------- | |
60 | * [1] USB | H | H | |
61 | * [2] none | H | L | |
62 | * [3] USB-HOST | L | H | |
63 | * [4] USB-HOST | L | L | |
64 | * | |
65 | * In case we have only one of these signals: | |
66 | * - VBUS only - we want to distinguish between [1] and [2], so ID is always 1. | |
67 | * - ID only - we want to distinguish between [1] and [4], so VBUS = ID. | |
68 | */ | |
e52817fa RQ |
69 | static void usb_extcon_detect_cable(struct work_struct *work) |
70 | { | |
541332a1 | 71 | int id, vbus; |
e52817fa RQ |
72 | struct usb_extcon_info *info = container_of(to_delayed_work(work), |
73 | struct usb_extcon_info, | |
74 | wq_detcable); | |
75 | ||
541332a1 RQ |
76 | /* check ID and VBUS and update cable state */ |
77 | id = info->id_gpiod ? | |
78 | gpiod_get_value_cansleep(info->id_gpiod) : 1; | |
79 | vbus = info->vbus_gpiod ? | |
80 | gpiod_get_value_cansleep(info->vbus_gpiod) : id; | |
81 | ||
82 | /* at first we clean states which are no longer active */ | |
83 | if (id) | |
8670b459 | 84 | extcon_set_state_sync(info->edev, EXTCON_USB_HOST, false); |
541332a1 | 85 | if (!vbus) |
8670b459 | 86 | extcon_set_state_sync(info->edev, EXTCON_USB, false); |
541332a1 RQ |
87 | |
88 | if (!id) { | |
8670b459 | 89 | extcon_set_state_sync(info->edev, EXTCON_USB_HOST, true); |
541332a1 RQ |
90 | } else { |
91 | if (vbus) | |
92 | extcon_set_state_sync(info->edev, EXTCON_USB, true); | |
e52817fa RQ |
93 | } |
94 | } | |
95 | ||
96 | static irqreturn_t usb_irq_handler(int irq, void *dev_id) | |
97 | { | |
98 | struct usb_extcon_info *info = dev_id; | |
99 | ||
100 | queue_delayed_work(system_power_efficient_wq, &info->wq_detcable, | |
101 | info->debounce_jiffies); | |
102 | ||
103 | return IRQ_HANDLED; | |
104 | } | |
105 | ||
106 | static int usb_extcon_probe(struct platform_device *pdev) | |
107 | { | |
108 | struct device *dev = &pdev->dev; | |
109 | struct device_node *np = dev->of_node; | |
110 | struct usb_extcon_info *info; | |
111 | int ret; | |
112 | ||
366380cd | 113 | if (!np) |
e52817fa RQ |
114 | return -EINVAL; |
115 | ||
116 | info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL); | |
117 | if (!info) | |
118 | return -ENOMEM; | |
119 | ||
120 | info->dev = dev; | |
541332a1 RQ |
121 | info->id_gpiod = devm_gpiod_get_optional(&pdev->dev, "id", GPIOD_IN); |
122 | info->vbus_gpiod = devm_gpiod_get_optional(&pdev->dev, "vbus", | |
123 | GPIOD_IN); | |
124 | ||
125 | if (!info->id_gpiod && !info->vbus_gpiod) { | |
126 | dev_err(dev, "failed to get gpios\n"); | |
127 | return -ENODEV; | |
e52817fa RQ |
128 | } |
129 | ||
541332a1 RQ |
130 | if (IS_ERR(info->id_gpiod)) |
131 | return PTR_ERR(info->id_gpiod); | |
132 | ||
133 | if (IS_ERR(info->vbus_gpiod)) | |
134 | return PTR_ERR(info->vbus_gpiod); | |
135 | ||
bc1aabad RB |
136 | info->edev = devm_extcon_dev_allocate(dev, usb_extcon_cable); |
137 | if (IS_ERR(info->edev)) { | |
138 | dev_err(dev, "failed to allocate extcon device\n"); | |
139 | return -ENOMEM; | |
140 | } | |
141 | ||
142 | ret = devm_extcon_dev_register(dev, info->edev); | |
143 | if (ret < 0) { | |
144 | dev_err(dev, "failed to register extcon device\n"); | |
145 | return ret; | |
146 | } | |
147 | ||
541332a1 RQ |
148 | if (info->id_gpiod) |
149 | ret = gpiod_set_debounce(info->id_gpiod, | |
150 | USB_GPIO_DEBOUNCE_MS * 1000); | |
151 | if (!ret && info->vbus_gpiod) | |
152 | ret = gpiod_set_debounce(info->vbus_gpiod, | |
153 | USB_GPIO_DEBOUNCE_MS * 1000); | |
154 | ||
e52817fa RQ |
155 | if (ret < 0) |
156 | info->debounce_jiffies = msecs_to_jiffies(USB_GPIO_DEBOUNCE_MS); | |
157 | ||
158 | INIT_DELAYED_WORK(&info->wq_detcable, usb_extcon_detect_cable); | |
159 | ||
541332a1 RQ |
160 | if (info->id_gpiod) { |
161 | info->id_irq = gpiod_to_irq(info->id_gpiod); | |
162 | if (info->id_irq < 0) { | |
163 | dev_err(dev, "failed to get ID IRQ\n"); | |
164 | return info->id_irq; | |
165 | } | |
166 | ||
167 | ret = devm_request_threaded_irq(dev, info->id_irq, NULL, | |
168 | usb_irq_handler, | |
169 | IRQF_TRIGGER_RISING | | |
170 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
171 | pdev->name, info); | |
172 | if (ret < 0) { | |
173 | dev_err(dev, "failed to request handler for ID IRQ\n"); | |
174 | return ret; | |
175 | } | |
e52817fa RQ |
176 | } |
177 | ||
541332a1 RQ |
178 | if (info->vbus_gpiod) { |
179 | info->vbus_irq = gpiod_to_irq(info->vbus_gpiod); | |
180 | if (info->vbus_irq < 0) { | |
181 | dev_err(dev, "failed to get VBUS IRQ\n"); | |
182 | return info->vbus_irq; | |
183 | } | |
184 | ||
185 | ret = devm_request_threaded_irq(dev, info->vbus_irq, NULL, | |
186 | usb_irq_handler, | |
187 | IRQF_TRIGGER_RISING | | |
188 | IRQF_TRIGGER_FALLING | IRQF_ONESHOT, | |
189 | pdev->name, info); | |
190 | if (ret < 0) { | |
191 | dev_err(dev, "failed to request handler for VBUS IRQ\n"); | |
192 | return ret; | |
193 | } | |
e52817fa RQ |
194 | } |
195 | ||
e52817fa | 196 | platform_set_drvdata(pdev, info); |
98fd0792 | 197 | device_set_wakeup_capable(&pdev->dev, true); |
e52817fa RQ |
198 | |
199 | /* Perform initial detection */ | |
200 | usb_extcon_detect_cable(&info->wq_detcable.work); | |
201 | ||
202 | return 0; | |
203 | } | |
204 | ||
205 | static int usb_extcon_remove(struct platform_device *pdev) | |
206 | { | |
207 | struct usb_extcon_info *info = platform_get_drvdata(pdev); | |
208 | ||
209 | cancel_delayed_work_sync(&info->wq_detcable); | |
12bd0f32 GS |
210 | device_init_wakeup(&pdev->dev, false); |
211 | ||
e52817fa RQ |
212 | return 0; |
213 | } | |
214 | ||
215 | #ifdef CONFIG_PM_SLEEP | |
216 | static int usb_extcon_suspend(struct device *dev) | |
217 | { | |
218 | struct usb_extcon_info *info = dev_get_drvdata(dev); | |
219 | int ret = 0; | |
220 | ||
541332a1 RQ |
221 | if (device_may_wakeup(dev)) { |
222 | if (info->id_gpiod) { | |
223 | ret = enable_irq_wake(info->id_irq); | |
224 | if (ret) | |
225 | return ret; | |
226 | } | |
227 | if (info->vbus_gpiod) { | |
228 | ret = enable_irq_wake(info->vbus_irq); | |
229 | if (ret) { | |
230 | if (info->id_gpiod) | |
231 | disable_irq_wake(info->id_irq); | |
232 | ||
233 | return ret; | |
234 | } | |
235 | } | |
236 | } | |
237 | ||
e52817fa RQ |
238 | /* |
239 | * We don't want to process any IRQs after this point | |
240 | * as GPIOs used behind I2C subsystem might not be | |
241 | * accessible until resume completes. So disable IRQ. | |
242 | */ | |
541332a1 RQ |
243 | if (info->id_gpiod) |
244 | disable_irq(info->id_irq); | |
245 | if (info->vbus_gpiod) | |
246 | disable_irq(info->vbus_irq); | |
e52817fa | 247 | |
bcb7440e PC |
248 | if (!device_may_wakeup(dev)) |
249 | pinctrl_pm_select_sleep_state(dev); | |
250 | ||
e52817fa RQ |
251 | return ret; |
252 | } | |
253 | ||
254 | static int usb_extcon_resume(struct device *dev) | |
255 | { | |
256 | struct usb_extcon_info *info = dev_get_drvdata(dev); | |
257 | int ret = 0; | |
258 | ||
bcb7440e PC |
259 | if (!device_may_wakeup(dev)) |
260 | pinctrl_pm_select_default_state(dev); | |
261 | ||
541332a1 RQ |
262 | if (device_may_wakeup(dev)) { |
263 | if (info->id_gpiod) { | |
264 | ret = disable_irq_wake(info->id_irq); | |
265 | if (ret) | |
266 | return ret; | |
267 | } | |
268 | if (info->vbus_gpiod) { | |
269 | ret = disable_irq_wake(info->vbus_irq); | |
270 | if (ret) { | |
271 | if (info->id_gpiod) | |
272 | enable_irq_wake(info->id_irq); | |
273 | ||
274 | return ret; | |
275 | } | |
276 | } | |
277 | } | |
278 | ||
279 | if (info->id_gpiod) | |
280 | enable_irq(info->id_irq); | |
281 | if (info->vbus_gpiod) | |
282 | enable_irq(info->vbus_irq); | |
283 | ||
8680b4d1 RQ |
284 | queue_delayed_work(system_power_efficient_wq, |
285 | &info->wq_detcable, 0); | |
e52817fa RQ |
286 | |
287 | return ret; | |
288 | } | |
289 | #endif | |
290 | ||
291 | static SIMPLE_DEV_PM_OPS(usb_extcon_pm_ops, | |
292 | usb_extcon_suspend, usb_extcon_resume); | |
293 | ||
34825e51 | 294 | static const struct of_device_id usb_extcon_dt_match[] = { |
e52817fa RQ |
295 | { .compatible = "linux,extcon-usb-gpio", }, |
296 | { /* sentinel */ } | |
297 | }; | |
298 | MODULE_DEVICE_TABLE(of, usb_extcon_dt_match); | |
299 | ||
058b6659 LB |
300 | static const struct platform_device_id usb_extcon_platform_ids[] = { |
301 | { .name = "extcon-usb-gpio", }, | |
302 | { /* sentinel */ } | |
303 | }; | |
304 | MODULE_DEVICE_TABLE(platform, usb_extcon_platform_ids); | |
305 | ||
e52817fa RQ |
306 | static struct platform_driver usb_extcon_driver = { |
307 | .probe = usb_extcon_probe, | |
308 | .remove = usb_extcon_remove, | |
309 | .driver = { | |
310 | .name = "extcon-usb-gpio", | |
311 | .pm = &usb_extcon_pm_ops, | |
312 | .of_match_table = usb_extcon_dt_match, | |
313 | }, | |
058b6659 | 314 | .id_table = usb_extcon_platform_ids, |
e52817fa RQ |
315 | }; |
316 | ||
317 | module_platform_driver(usb_extcon_driver); | |
318 | ||
319 | MODULE_AUTHOR("Roger Quadros <rogerq@ti.com>"); | |
320 | MODULE_DESCRIPTION("USB GPIO extcon driver"); | |
321 | MODULE_LICENSE("GPL v2"); |