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