1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * extcon-qcom-spmi-misc.c - Qualcomm USB extcon driver to support USB ID
  4 *			and VBUS detection based on extcon-usb-gpio.c.
  5 *
  6 * Copyright (C) 2016 Linaro, Ltd.
  7 * Stephen Boyd <stephen.boyd@linaro.org>
  8 */
  9
 10#include <linux/devm-helpers.h>
 11#include <linux/extcon-provider.h>
 12#include <linux/init.h>
 13#include <linux/interrupt.h>
 14#include <linux/kernel.h>
 15#include <linux/module.h>
 16#include <linux/mod_devicetable.h>
 17#include <linux/platform_device.h>
 18#include <linux/slab.h>
 19#include <linux/workqueue.h>
 20
 21#define USB_ID_DEBOUNCE_MS	5	/* ms */
 22
 23struct qcom_usb_extcon_info {
 24	struct extcon_dev *edev;
 25	int id_irq;
 26	int vbus_irq;
 27	struct delayed_work wq_detcable;
 28	unsigned long debounce_jiffies;
 29};
 30
 31static const unsigned int qcom_usb_extcon_cable[] = {
 32	EXTCON_USB,
 33	EXTCON_USB_HOST,
 34	EXTCON_NONE,
 35};
 36
 37static void qcom_usb_extcon_detect_cable(struct work_struct *work)
 38{
 39	bool state = false;
 40	int ret;
 41	union extcon_property_value val;
 42	struct qcom_usb_extcon_info *info = container_of(to_delayed_work(work),
 43						    struct qcom_usb_extcon_info,
 44						    wq_detcable);
 45
 46	if (info->id_irq > 0) {
 47		/* check ID and update cable state */
 48		ret = irq_get_irqchip_state(info->id_irq,
 49				IRQCHIP_STATE_LINE_LEVEL, &state);
 50		if (ret)
 51			return;
 52
 53		if (!state) {
 54			val.intval = true;
 55			extcon_set_property(info->edev, EXTCON_USB_HOST,
 56						EXTCON_PROP_USB_SS, val);
 57		}
 58		extcon_set_state_sync(info->edev, EXTCON_USB_HOST, !state);
 59	}
 60
 61	if (info->vbus_irq > 0) {
 62		/* check VBUS and update cable state */
 63		ret = irq_get_irqchip_state(info->vbus_irq,
 64				IRQCHIP_STATE_LINE_LEVEL, &state);
 65		if (ret)
 66			return;
 67
 68		if (state) {
 69			val.intval = true;
 70			extcon_set_property(info->edev, EXTCON_USB,
 71						EXTCON_PROP_USB_SS, val);
 72		}
 73		extcon_set_state_sync(info->edev, EXTCON_USB, state);
 74	}
 75}
 76
 77static irqreturn_t qcom_usb_irq_handler(int irq, void *dev_id)
 78{
 79	struct qcom_usb_extcon_info *info = dev_id;
 80
 81	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
 82			   info->debounce_jiffies);
 83
 84	return IRQ_HANDLED;
 85}
 86
 87static int qcom_usb_extcon_probe(struct platform_device *pdev)
 88{
 89	struct device *dev = &pdev->dev;
 90	struct qcom_usb_extcon_info *info;
 91	int ret;
 92
 93	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
 94	if (!info)
 95		return -ENOMEM;
 96
 97	info->edev = devm_extcon_dev_allocate(dev, qcom_usb_extcon_cable);
 98	if (IS_ERR(info->edev)) {
 99		dev_err(dev, "failed to allocate extcon device\n");
100		return -ENOMEM;
101	}
102
103	ret = devm_extcon_dev_register(dev, info->edev);
104	if (ret < 0) {
105		dev_err(dev, "failed to register extcon device\n");
106		return ret;
107	}
108
109	ret = extcon_set_property_capability(info->edev,
110			EXTCON_USB, EXTCON_PROP_USB_SS);
111	ret |= extcon_set_property_capability(info->edev,
112			EXTCON_USB_HOST, EXTCON_PROP_USB_SS);
113	if (ret) {
114		dev_err(dev, "failed to register extcon props rc=%d\n",
115						ret);
116		return ret;
117	}
118
119	info->debounce_jiffies = msecs_to_jiffies(USB_ID_DEBOUNCE_MS);
120
121	ret = devm_delayed_work_autocancel(dev, &info->wq_detcable,
122					   qcom_usb_extcon_detect_cable);
123	if (ret)
124		return ret;
125
126	info->id_irq = platform_get_irq_byname_optional(pdev, "usb_id");
127	if (info->id_irq > 0) {
128		ret = devm_request_threaded_irq(dev, info->id_irq, NULL,
129					qcom_usb_irq_handler,
130					IRQF_TRIGGER_RISING |
131					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
132					pdev->name, info);
133		if (ret < 0) {
134			dev_err(dev, "failed to request handler for ID IRQ\n");
135			return ret;
136		}
137	}
138
139	info->vbus_irq = platform_get_irq_byname_optional(pdev, "usb_vbus");
140	if (info->vbus_irq > 0) {
141		ret = devm_request_threaded_irq(dev, info->vbus_irq, NULL,
142					qcom_usb_irq_handler,
143					IRQF_TRIGGER_RISING |
144					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
145					pdev->name, info);
146		if (ret < 0) {
147			dev_err(dev, "failed to request handler for VBUS IRQ\n");
148			return ret;
149		}
150	}
151
152	if (info->id_irq < 0 && info->vbus_irq < 0) {
153		dev_err(dev, "ID and VBUS IRQ not found\n");
154		return -EINVAL;
155	}
156
157	platform_set_drvdata(pdev, info);
158	device_init_wakeup(dev, 1);
159
160	/* Perform initial detection */
161	qcom_usb_extcon_detect_cable(&info->wq_detcable.work);
162
163	return 0;
164}
165
166#ifdef CONFIG_PM_SLEEP
167static int qcom_usb_extcon_suspend(struct device *dev)
168{
169	struct qcom_usb_extcon_info *info = dev_get_drvdata(dev);
170	int ret = 0;
171
172	if (device_may_wakeup(dev)) {
173		if (info->id_irq > 0)
174			ret = enable_irq_wake(info->id_irq);
175		if (info->vbus_irq > 0)
176			ret = enable_irq_wake(info->vbus_irq);
177	}
178
179	return ret;
180}
181
182static int qcom_usb_extcon_resume(struct device *dev)
183{
184	struct qcom_usb_extcon_info *info = dev_get_drvdata(dev);
185	int ret = 0;
186
187	if (device_may_wakeup(dev)) {
188		if (info->id_irq > 0)
189			ret = disable_irq_wake(info->id_irq);
190		if (info->vbus_irq > 0)
191			ret = disable_irq_wake(info->vbus_irq);
192	}
193
194	return ret;
195}
196#endif
197
198static SIMPLE_DEV_PM_OPS(qcom_usb_extcon_pm_ops,
199			 qcom_usb_extcon_suspend, qcom_usb_extcon_resume);
200
201static const struct of_device_id qcom_usb_extcon_dt_match[] = {
202	{ .compatible = "qcom,pm8941-misc", },
203	{ }
204};
205MODULE_DEVICE_TABLE(of, qcom_usb_extcon_dt_match);
206
207static struct platform_driver qcom_usb_extcon_driver = {
208	.probe		= qcom_usb_extcon_probe,
209	.driver		= {
210		.name	= "extcon-pm8941-misc",
211		.pm	= &qcom_usb_extcon_pm_ops,
212		.of_match_table = qcom_usb_extcon_dt_match,
213	},
214};
215module_platform_driver(qcom_usb_extcon_driver);
216
217MODULE_DESCRIPTION("QCOM USB ID extcon driver");
218MODULE_AUTHOR("Stephen Boyd <stephen.boyd@linaro.org>");
219MODULE_LICENSE("GPL v2");