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/mod_devicetable.h>
17 #include <linux/platform_device.h>
18 #include <linux/slab.h>
19 #include <linux/workqueue.h>
20
21 #define USB_ID_DEBOUNCE_MS 5 /* ms */
22
23 struct qcom_usb_extcon_info {
24 struct extcon_dev *edev;
25 int id_irq;
26 int vbus_irq;
27 struct delayed_work wq_detcable;
28 unsigned long debounce_jiffies;
29 };
30
31 static const unsigned int qcom_usb_extcon_cable[] = {
32 EXTCON_USB,
33 EXTCON_USB_HOST,
34 EXTCON_NONE,
35 };
36
qcom_usb_extcon_detect_cable(struct work_struct * work)37 static void qcom_usb_extcon_detect_cable(struct work_struct *work)
38 {
39 bool state = false;
40 int ret;
41 union extcon_property_value val;
42 struct qcom_usb_extcon_info *info = container_of(to_delayed_work(work),
43 struct qcom_usb_extcon_info,
44 wq_detcable);
45
46 if (info->id_irq > 0) {
47 /* check ID and update cable state */
48 ret = irq_get_irqchip_state(info->id_irq,
49 IRQCHIP_STATE_LINE_LEVEL, &state);
50 if (ret)
51 return;
52
53 if (!state) {
54 val.intval = true;
55 extcon_set_property(info->edev, EXTCON_USB_HOST,
56 EXTCON_PROP_USB_SS, val);
57 }
58 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, !state);
59 }
60
61 if (info->vbus_irq > 0) {
62 /* check VBUS and update cable state */
63 ret = irq_get_irqchip_state(info->vbus_irq,
64 IRQCHIP_STATE_LINE_LEVEL, &state);
65 if (ret)
66 return;
67
68 if (state) {
69 val.intval = true;
70 extcon_set_property(info->edev, EXTCON_USB,
71 EXTCON_PROP_USB_SS, val);
72 }
73 extcon_set_state_sync(info->edev, EXTCON_USB, state);
74 }
75 }
76
qcom_usb_irq_handler(int irq,void * dev_id)77 static irqreturn_t qcom_usb_irq_handler(int irq, void *dev_id)
78 {
79 struct qcom_usb_extcon_info *info = dev_id;
80
81 queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
82 info->debounce_jiffies);
83
84 return IRQ_HANDLED;
85 }
86
qcom_usb_extcon_probe(struct platform_device * pdev)87 static int qcom_usb_extcon_probe(struct platform_device *pdev)
88 {
89 struct device *dev = &pdev->dev;
90 struct qcom_usb_extcon_info *info;
91 int ret;
92
93 info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
94 if (!info)
95 return -ENOMEM;
96
97 info->edev = devm_extcon_dev_allocate(dev, qcom_usb_extcon_cable);
98 if (IS_ERR(info->edev)) {
99 dev_err(dev, "failed to allocate extcon device\n");
100 return -ENOMEM;
101 }
102
103 ret = devm_extcon_dev_register(dev, info->edev);
104 if (ret < 0) {
105 dev_err(dev, "failed to register extcon device\n");
106 return ret;
107 }
108
109 ret = extcon_set_property_capability(info->edev,
110 EXTCON_USB, EXTCON_PROP_USB_SS);
111 ret |= extcon_set_property_capability(info->edev,
112 EXTCON_USB_HOST, EXTCON_PROP_USB_SS);
113 if (ret) {
114 dev_err(dev, "failed to register extcon props rc=%d\n",
115 ret);
116 return ret;
117 }
118
119 info->debounce_jiffies = msecs_to_jiffies(USB_ID_DEBOUNCE_MS);
120
121 ret = devm_delayed_work_autocancel(dev, &info->wq_detcable,
122 qcom_usb_extcon_detect_cable);
123 if (ret)
124 return ret;
125
126 info->id_irq = platform_get_irq_byname_optional(pdev, "usb_id");
127 if (info->id_irq > 0) {
128 ret = devm_request_threaded_irq(dev, info->id_irq, NULL,
129 qcom_usb_irq_handler,
130 IRQF_TRIGGER_RISING |
131 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
132 pdev->name, info);
133 if (ret < 0) {
134 dev_err(dev, "failed to request handler for ID IRQ\n");
135 return ret;
136 }
137 }
138
139 info->vbus_irq = platform_get_irq_byname_optional(pdev, "usb_vbus");
140 if (info->vbus_irq > 0) {
141 ret = devm_request_threaded_irq(dev, info->vbus_irq, NULL,
142 qcom_usb_irq_handler,
143 IRQF_TRIGGER_RISING |
144 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
145 pdev->name, info);
146 if (ret < 0) {
147 dev_err(dev, "failed to request handler for VBUS IRQ\n");
148 return ret;
149 }
150 }
151
152 if (info->id_irq < 0 && info->vbus_irq < 0) {
153 dev_err(dev, "ID and VBUS IRQ not found\n");
154 return -EINVAL;
155 }
156
157 platform_set_drvdata(pdev, info);
158 device_init_wakeup(dev, 1);
159
160 /* Perform initial detection */
161 qcom_usb_extcon_detect_cable(&info->wq_detcable.work);
162
163 return 0;
164 }
165
166 #ifdef CONFIG_PM_SLEEP
qcom_usb_extcon_suspend(struct device * dev)167 static int qcom_usb_extcon_suspend(struct device *dev)
168 {
169 struct qcom_usb_extcon_info *info = dev_get_drvdata(dev);
170 int ret = 0;
171
172 if (device_may_wakeup(dev)) {
173 if (info->id_irq > 0)
174 ret = enable_irq_wake(info->id_irq);
175 if (info->vbus_irq > 0)
176 ret = enable_irq_wake(info->vbus_irq);
177 }
178
179 return ret;
180 }
181
qcom_usb_extcon_resume(struct device * dev)182 static int qcom_usb_extcon_resume(struct device *dev)
183 {
184 struct qcom_usb_extcon_info *info = dev_get_drvdata(dev);
185 int ret = 0;
186
187 if (device_may_wakeup(dev)) {
188 if (info->id_irq > 0)
189 ret = disable_irq_wake(info->id_irq);
190 if (info->vbus_irq > 0)
191 ret = disable_irq_wake(info->vbus_irq);
192 }
193
194 return ret;
195 }
196 #endif
197
198 static SIMPLE_DEV_PM_OPS(qcom_usb_extcon_pm_ops,
199 qcom_usb_extcon_suspend, qcom_usb_extcon_resume);
200
201 static const struct of_device_id qcom_usb_extcon_dt_match[] = {
202 { .compatible = "qcom,pm8941-misc", },
203 { }
204 };
205 MODULE_DEVICE_TABLE(of, qcom_usb_extcon_dt_match);
206
207 static struct platform_driver qcom_usb_extcon_driver = {
208 .probe = qcom_usb_extcon_probe,
209 .driver = {
210 .name = "extcon-pm8941-misc",
211 .pm = &qcom_usb_extcon_pm_ops,
212 .of_match_table = qcom_usb_extcon_dt_match,
213 },
214 };
215 module_platform_driver(qcom_usb_extcon_driver);
216
217 MODULE_DESCRIPTION("QCOM USB ID extcon driver");
218 MODULE_AUTHOR("Stephen Boyd <stephen.boyd@linaro.org>");
219 MODULE_LICENSE("GPL v2");
220