[linux.git] / drivers / extcon / extcon-qcom-spmi-misc.c

/**
 * extcon-qcom-spmi-misc.c - Qualcomm USB extcon driver to support USB ID
 *				detection based on extcon-usb-gpio.c.
 *
 * Copyright (C) 2016 Linaro, Ltd.
 * Stephen Boyd <[email protected]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include <linux/extcon.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/workqueue.h>

#define USB_ID_DEBOUNCE_MS	5	/* ms */

struct qcom_usb_extcon_info {
	struct extcon_dev *edev;
	int irq;
	struct delayed_work wq_detcable;
	unsigned long debounce_jiffies;
};

static const unsigned int qcom_usb_extcon_cable[] = {
	EXTCON_USB_HOST,
	EXTCON_NONE,
};

static void qcom_usb_extcon_detect_cable(struct work_struct *work)
{
	bool id;
	int ret;
	struct qcom_usb_extcon_info *info = container_of(to_delayed_work(work),
						    struct qcom_usb_extcon_info,
						    wq_detcable);

	/* check ID and update cable state */
	ret = irq_get_irqchip_state(info->irq, IRQCHIP_STATE_LINE_LEVEL, &id);
	if (ret)
		return;

	extcon_set_state_sync(info->edev, EXTCON_USB_HOST, !id);
}

static irqreturn_t qcom_usb_irq_handler(int irq, void *dev_id)
{
	struct qcom_usb_extcon_info *info = dev_id;

	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
			   info->debounce_jiffies);

	return IRQ_HANDLED;
}

static int qcom_usb_extcon_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct qcom_usb_extcon_info *info;
	int ret;

	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
	if (!info)
		return -ENOMEM;

	info->edev = devm_extcon_dev_allocate(dev, qcom_usb_extcon_cable);
	if (IS_ERR(info->edev)) {
		dev_err(dev, "failed to allocate extcon device\n");
		return -ENOMEM;
	}

	ret = devm_extcon_dev_register(dev, info->edev);
	if (ret < 0) {
		dev_err(dev, "failed to register extcon device\n");
		return ret;
	}

	info->debounce_jiffies = msecs_to_jiffies(USB_ID_DEBOUNCE_MS);
	INIT_DELAYED_WORK(&info->wq_detcable, qcom_usb_extcon_detect_cable);

	info->irq = platform_get_irq_byname(pdev, "usb_id");
	if (info->irq < 0)
		return info->irq;

	ret = devm_request_threaded_irq(dev, info->irq, NULL,
					qcom_usb_irq_handler,
					IRQF_TRIGGER_RISING |
					IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
					pdev->name, info);
	if (ret < 0) {
		dev_err(dev, "failed to request handler for ID IRQ\n");
		return ret;
	}

	platform_set_drvdata(pdev, info);
	device_init_wakeup(dev, 1);

	/* Perform initial detection */
	qcom_usb_extcon_detect_cable(&info->wq_detcable.work);

	return 0;
}

static int qcom_usb_extcon_remove(struct platform_device *pdev)
{
	struct qcom_usb_extcon_info *info = platform_get_drvdata(pdev);

	cancel_delayed_work_sync(&info->wq_detcable);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int qcom_usb_extcon_suspend(struct device *dev)
{
	struct qcom_usb_extcon_info *info = dev_get_drvdata(dev);
	int ret = 0;

	if (device_may_wakeup(dev))
		ret = enable_irq_wake(info->irq);

	return ret;
}

static int qcom_usb_extcon_resume(struct device *dev)
{
	struct qcom_usb_extcon_info *info = dev_get_drvdata(dev);
	int ret = 0;

	if (device_may_wakeup(dev))
		ret = disable_irq_wake(info->irq);

	return ret;
}
#endif

static SIMPLE_DEV_PM_OPS(qcom_usb_extcon_pm_ops,
			 qcom_usb_extcon_suspend, qcom_usb_extcon_resume);

static const struct of_device_id qcom_usb_extcon_dt_match[] = {
	{ .compatible = "qcom,pm8941-misc", },
	{ }
};
MODULE_DEVICE_TABLE(of, qcom_usb_extcon_dt_match);

static struct platform_driver qcom_usb_extcon_driver = {
	.probe		= qcom_usb_extcon_probe,
	.remove		= qcom_usb_extcon_remove,
	.driver		= {
		.name	= "extcon-pm8941-misc",
		.pm	= &qcom_usb_extcon_pm_ops,
		.of_match_table = qcom_usb_extcon_dt_match,
	},
};
module_platform_driver(qcom_usb_extcon_driver);

MODULE_DESCRIPTION("QCOM USB ID extcon driver");
MODULE_AUTHOR("Stephen Boyd <[email protected]>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
38085c98 SB	1	/**
	2	* extcon-qcom-spmi-misc.c - Qualcomm USB extcon driver to support USB ID
	3	* detection based on extcon-usb-gpio.c.
	4	*
	5	* Copyright (C) 2016 Linaro, Ltd.
	6	* Stephen Boyd <[email protected]>
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*/
	17
	18	#include <linux/extcon.h>
	19	#include <linux/init.h>
	20	#include <linux/interrupt.h>
	21	#include <linux/kernel.h>
	22	#include <linux/module.h>
	23	#include <linux/platform_device.h>
	24	#include <linux/slab.h>
	25	#include <linux/workqueue.h>
	26
	27	#define USB_ID_DEBOUNCE_MS 5 /* ms */
	28
	29	struct qcom_usb_extcon_info {
	30	struct extcon_dev *edev;
	31	int irq;
	32	struct delayed_work wq_detcable;
	33	unsigned long debounce_jiffies;
	34	};
	35
	36	static const unsigned int qcom_usb_extcon_cable[] = {
	37	EXTCON_USB_HOST,
	38	EXTCON_NONE,
	39	};
	40
	41	static void qcom_usb_extcon_detect_cable(struct work_struct *work)
	42	{
	43	bool id;
	44	int ret;
	45	struct qcom_usb_extcon_info *info = container_of(to_delayed_work(work),
	46	struct qcom_usb_extcon_info,
	47	wq_detcable);
	48
	49	/* check ID and update cable state */
	50	ret = irq_get_irqchip_state(info->irq, IRQCHIP_STATE_LINE_LEVEL, &id);
	51	if (ret)
	52	return;
	53
2925d366	54	extcon_set_state_sync(info->edev, EXTCON_USB_HOST, !id);
38085c98 SB	55	}
	56
	57	static irqreturn_t qcom_usb_irq_handler(int irq, void *dev_id)
	58	{
	59	struct qcom_usb_extcon_info *info = dev_id;
	60
	61	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
	62	info->debounce_jiffies);
	63
	64	return IRQ_HANDLED;
	65	}
	66
	67	static int qcom_usb_extcon_probe(struct platform_device *pdev)
	68	{
	69	struct device *dev = &pdev->dev;
	70	struct qcom_usb_extcon_info *info;
	71	int ret;
	72
	73	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
	74	if (!info)
	75	return -ENOMEM;
	76
	77	info->edev = devm_extcon_dev_allocate(dev, qcom_usb_extcon_cable);
	78	if (IS_ERR(info->edev)) {
	79	dev_err(dev, "failed to allocate extcon device\n");
	80	return -ENOMEM;
	81	}
	82
	83	ret = devm_extcon_dev_register(dev, info->edev);
	84	if (ret < 0) {
	85	dev_err(dev, "failed to register extcon device\n");
	86	return ret;
	87	}
	88
	89	info->debounce_jiffies = msecs_to_jiffies(USB_ID_DEBOUNCE_MS);
	90	INIT_DELAYED_WORK(&info->wq_detcable, qcom_usb_extcon_detect_cable);
	91
	92	info->irq = platform_get_irq_byname(pdev, "usb_id");
	93	if (info->irq < 0)
	94	return info->irq;
	95
	96	ret = devm_request_threaded_irq(dev, info->irq, NULL,
	97	qcom_usb_irq_handler,
	98	IRQF_TRIGGER_RISING \|
	99	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	100	pdev->name, info);
	101	if (ret < 0) {
	102	dev_err(dev, "failed to request handler for ID IRQ\n");
	103	return ret;
	104	}
	105
	106	platform_set_drvdata(pdev, info);
	107	device_init_wakeup(dev, 1);
	108
	109	/* Perform initial detection */
	110	qcom_usb_extcon_detect_cable(&info->wq_detcable.work);
	111
	112	return 0;
	113	}
	114
	115	static int qcom_usb_extcon_remove(struct platform_device *pdev)
	116	{
	117	struct qcom_usb_extcon_info *info = platform_get_drvdata(pdev);
	118
119	cancel_delayed_work_sync(&info->wq_detcable);
120
121	return 0;
122	}
123
124	#ifdef CONFIG_PM_SLEEP
125	static int qcom_usb_extcon_suspend(struct device *dev)
126	{
127	struct qcom_usb_extcon_info *info = dev_get_drvdata(dev);
128	int ret = 0;
129
130	if (device_may_wakeup(dev))
131	ret = enable_irq_wake(info->irq);
132
133	return ret;
134	}
135
136	static int qcom_usb_extcon_resume(struct device *dev)
137	{
138	struct qcom_usb_extcon_info *info = dev_get_drvdata(dev);
139	int ret = 0;
140
141	if (device_may_wakeup(dev))
142	ret = disable_irq_wake(info->irq);
143
144	return ret;
145	}
146	#endif
147
148	static SIMPLE_DEV_PM_OPS(qcom_usb_extcon_pm_ops,
149	qcom_usb_extcon_suspend, qcom_usb_extcon_resume);
150
151	static const struct of_device_id qcom_usb_extcon_dt_match[] = {
152	{ .compatible = "qcom,pm8941-misc", },
153	{ }
154	};
155	MODULE_DEVICE_TABLE(of, qcom_usb_extcon_dt_match);
156
157	static struct platform_driver qcom_usb_extcon_driver = {
158	.probe = qcom_usb_extcon_probe,
159	.remove = qcom_usb_extcon_remove,
160	.driver = {
161	.name = "extcon-pm8941-misc",
162	.pm = &qcom_usb_extcon_pm_ops,
163	.of_match_table = qcom_usb_extcon_dt_match,
164	},
165	};
166	module_platform_driver(qcom_usb_extcon_driver);
167
168	MODULE_DESCRIPTION("QCOM USB ID extcon driver");
169	MODULE_AUTHOR("Stephen Boyd <[email protected]>");
170	MODULE_LICENSE("GPL v2");