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10#include <linux/extcon-provider.h>
11#include <linux/init.h>
12#include <linux/interrupt.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/mod_devicetable.h>
16#include <linux/platform_device.h>
17#include <linux/slab.h>
18#include <linux/workqueue.h>
19
20#define USB_ID_DEBOUNCE_MS 5
21
22struct 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
29static const unsigned int qcom_usb_extcon_cable[] = {
30 EXTCON_USB_HOST,
31 EXTCON_NONE,
32};
33
34static 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
43 ret = irq_get_irqchip_state(info->irq, IRQCHIP_STATE_LINE_LEVEL, &id);
44 if (ret)
45 return;
46
47 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, !id);
48}
49
50static 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
60static 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
103 qcom_usb_extcon_detect_cable(&info->wq_detcable.work);
104
105 return 0;
106}
107
108static 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
118static 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
129static 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
141static SIMPLE_DEV_PM_OPS(qcom_usb_extcon_pm_ops,
142 qcom_usb_extcon_suspend, qcom_usb_extcon_resume);
143
144static const struct of_device_id qcom_usb_extcon_dt_match[] = {
145 { .compatible = "qcom,pm8941-misc", },
146 { }
147};
148MODULE_DEVICE_TABLE(of, qcom_usb_extcon_dt_match);
149
150static 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};
159module_platform_driver(qcom_usb_extcon_driver);
160
161MODULE_DESCRIPTION("QCOM USB ID extcon driver");
162MODULE_AUTHOR("Stephen Boyd <stephen.boyd@linaro.org>");
163MODULE_LICENSE("GPL v2");
164
