[linux-2.6-block.git] / drivers / extcon / extcon-qcom-spmi-misc.c

// SPDX-License-Identifier: GPL-2.0-only
/**
 * 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 <stephen.boyd@linaro.org>
 */

#include <linux/extcon-provider.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/mod_devicetable.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 <stephen.boyd@linaro.org>");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
1802d0be	1	// SPDX-License-Identifier: GPL-2.0-only
38085c98 SB	2	/**
	3	* extcon-qcom-spmi-misc.c - Qualcomm USB extcon driver to support USB ID
	4	* detection based on extcon-usb-gpio.c.
	5	*
	6	* Copyright (C) 2016 Linaro, Ltd.
	7	* Stephen Boyd <stephen.boyd@linaro.org>
38085c98 SB	8	*/
38085c98 SB	9
176aa360	10	#include <linux/extcon-provider.h>
38085c98 SB	11	#include <linux/init.h>
	12	#include <linux/interrupt.h>
	13	#include <linux/kernel.h>
	14	#include <linux/module.h>
ac316725	15	#include <linux/mod_devicetable.h>
38085c98 SB	16	#include <linux/platform_device.h>
	17	#include <linux/slab.h>
	18	#include <linux/workqueue.h>
	19
	20	#define USB_ID_DEBOUNCE_MS 5 /* ms */
	21
	22	struct qcom_usb_extcon_info {
	23	struct extcon_dev *edev;
	24	int irq;
	25	struct delayed_work wq_detcable;
	26	unsigned long debounce_jiffies;
	27	};
	28
	29	static const unsigned int qcom_usb_extcon_cable[] = {
	30	EXTCON_USB_HOST,
	31	EXTCON_NONE,
	32	};
	33
	34	static void qcom_usb_extcon_detect_cable(struct work_struct *work)
	35	{
	36	bool id;
	37	int ret;
	38	struct qcom_usb_extcon_info *info = container_of(to_delayed_work(work),
	39	struct qcom_usb_extcon_info,
	40	wq_detcable);
	41
	42	/* check ID and update cable state */
	43	ret = irq_get_irqchip_state(info->irq, IRQCHIP_STATE_LINE_LEVEL, &id);
	44	if (ret)
	45	return;
	46
2925d366	47	extcon_set_state_sync(info->edev, EXTCON_USB_HOST, !id);
38085c98 SB	48	}
	49
	50	static irqreturn_t qcom_usb_irq_handler(int irq, void *dev_id)
	51	{
	52	struct qcom_usb_extcon_info *info = dev_id;
	53
	54	queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
	55	info->debounce_jiffies);
	56
	57	return IRQ_HANDLED;
	58	}
	59
	60	static int qcom_usb_extcon_probe(struct platform_device *pdev)
	61	{
	62	struct device *dev = &pdev->dev;
	63	struct qcom_usb_extcon_info *info;
	64	int ret;
	65
	66	info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
	67	if (!info)
	68	return -ENOMEM;
	69
	70	info->edev = devm_extcon_dev_allocate(dev, qcom_usb_extcon_cable);
	71	if (IS_ERR(info->edev)) {
	72	dev_err(dev, "failed to allocate extcon device\n");
	73	return -ENOMEM;
	74	}
	75
	76	ret = devm_extcon_dev_register(dev, info->edev);
	77	if (ret < 0) {
	78	dev_err(dev, "failed to register extcon device\n");
	79	return ret;
	80	}
	81
	82	info->debounce_jiffies = msecs_to_jiffies(USB_ID_DEBOUNCE_MS);
	83	INIT_DELAYED_WORK(&info->wq_detcable, qcom_usb_extcon_detect_cable);
	84
	85	info->irq = platform_get_irq_byname(pdev, "usb_id");
	86	if (info->irq < 0)
	87	return info->irq;
	88
	89	ret = devm_request_threaded_irq(dev, info->irq, NULL,
	90	qcom_usb_irq_handler,
	91	IRQF_TRIGGER_RISING \|
	92	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	93	pdev->name, info);
	94	if (ret < 0) {
	95	dev_err(dev, "failed to request handler for ID IRQ\n");
	96	return ret;
	97	}
	98
	99	platform_set_drvdata(pdev, info);
	100	device_init_wakeup(dev, 1);
	101
	102	/* Perform initial detection */
	103	qcom_usb_extcon_detect_cable(&info->wq_detcable.work);
	104
	105	return 0;
	106	}
	107
	108	static int qcom_usb_extcon_remove(struct platform_device *pdev)
	109	{
	110	struct qcom_usb_extcon_info *info = platform_get_drvdata(pdev);
	111
112	cancel_delayed_work_sync(&info->wq_detcable);
113
114	return 0;
115	}
116
117	#ifdef CONFIG_PM_SLEEP
118	static int qcom_usb_extcon_suspend(struct device *dev)
119	{
120	struct qcom_usb_extcon_info *info = dev_get_drvdata(dev);
121	int ret = 0;
122
123	if (device_may_wakeup(dev))
124	ret = enable_irq_wake(info->irq);
125
126	return ret;
127	}
128
129	static int qcom_usb_extcon_resume(struct device *dev)
130	{
131	struct qcom_usb_extcon_info *info = dev_get_drvdata(dev);
132	int ret = 0;
133
134	if (device_may_wakeup(dev))
135	ret = disable_irq_wake(info->irq);
136
137	return ret;
138	}
139	#endif
140
141	static SIMPLE_DEV_PM_OPS(qcom_usb_extcon_pm_ops,
142	qcom_usb_extcon_suspend, qcom_usb_extcon_resume);
143
144	static const struct of_device_id qcom_usb_extcon_dt_match[] = {
145	{ .compatible = "qcom,pm8941-misc", },
146	{ }
147	};
148	MODULE_DEVICE_TABLE(of, qcom_usb_extcon_dt_match);
149
150	static struct platform_driver qcom_usb_extcon_driver = {
151	.probe = qcom_usb_extcon_probe,
152	.remove = qcom_usb_extcon_remove,
153	.driver = {
154	.name = "extcon-pm8941-misc",
155	.pm = &qcom_usb_extcon_pm_ops,
156	.of_match_table = qcom_usb_extcon_dt_match,
157	},
158	};
159	module_platform_driver(qcom_usb_extcon_driver);
160
161	MODULE_DESCRIPTION("QCOM USB ID extcon driver");
162	MODULE_AUTHOR("Stephen Boyd <stephen.boyd@linaro.org>");
163	MODULE_LICENSE("GPL v2");