summaryrefslogtreecommitdiffstats
path: root/drivers/extcon/extcon-qcom-spmi-misc.c
blob: ca957a5f4291228a77c85b65cf08f0fb690bf522 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
/**
 * 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>
 *
 * 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(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");