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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
23struct 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
31static const unsigned int qcom_usb_extcon_cable[] = {
32 EXTCON_USB,
33 EXTCON_USB_HOST,
34 EXTCON_NONE,
35};
36
37static 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
77static 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
87static 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
167static 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
182static 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
198static SIMPLE_DEV_PM_OPS(qcom_usb_extcon_pm_ops,
199 qcom_usb_extcon_suspend, qcom_usb_extcon_resume);
200
201static const struct of_device_id qcom_usb_extcon_dt_match[] = {
202 { .compatible = "qcom,pm8941-misc", },
203 { }
204};
205MODULE_DEVICE_TABLE(of, qcom_usb_extcon_dt_match);
206
207static 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};
215module_platform_driver(qcom_usb_extcon_driver);
216
217MODULE_DESCRIPTION("QCOM USB ID extcon driver");
218MODULE_AUTHOR("Stephen Boyd <stephen.boyd@linaro.org>");
219MODULE_LICENSE("GPL v2");
1/**
2 * extcon-qcom-spmi-misc.c - Qualcomm USB extcon driver to support USB ID
3 * detection based on extcon-usb-gpio.c.
4 *
5 * Copyright (C) 2016 Linaro, Ltd.
6 * Stephen Boyd <stephen.boyd@linaro.org>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
18#include <linux/extcon-provider.h>
19#include <linux/init.h>
20#include <linux/interrupt.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/platform_device.h>
24#include <linux/slab.h>
25#include <linux/workqueue.h>
26
27#define USB_ID_DEBOUNCE_MS 5 /* ms */
28
29struct qcom_usb_extcon_info {
30 struct extcon_dev *edev;
31 int irq;
32 struct delayed_work wq_detcable;
33 unsigned long debounce_jiffies;
34};
35
36static const unsigned int qcom_usb_extcon_cable[] = {
37 EXTCON_USB_HOST,
38 EXTCON_NONE,
39};
40
41static void qcom_usb_extcon_detect_cable(struct work_struct *work)
42{
43 bool id;
44 int ret;
45 struct qcom_usb_extcon_info *info = container_of(to_delayed_work(work),
46 struct qcom_usb_extcon_info,
47 wq_detcable);
48
49 /* check ID and update cable state */
50 ret = irq_get_irqchip_state(info->irq, IRQCHIP_STATE_LINE_LEVEL, &id);
51 if (ret)
52 return;
53
54 extcon_set_state_sync(info->edev, EXTCON_USB_HOST, !id);
55}
56
57static irqreturn_t qcom_usb_irq_handler(int irq, void *dev_id)
58{
59 struct qcom_usb_extcon_info *info = dev_id;
60
61 queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
62 info->debounce_jiffies);
63
64 return IRQ_HANDLED;
65}
66
67static int qcom_usb_extcon_probe(struct platform_device *pdev)
68{
69 struct device *dev = &pdev->dev;
70 struct qcom_usb_extcon_info *info;
71 int ret;
72
73 info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
74 if (!info)
75 return -ENOMEM;
76
77 info->edev = devm_extcon_dev_allocate(dev, qcom_usb_extcon_cable);
78 if (IS_ERR(info->edev)) {
79 dev_err(dev, "failed to allocate extcon device\n");
80 return -ENOMEM;
81 }
82
83 ret = devm_extcon_dev_register(dev, info->edev);
84 if (ret < 0) {
85 dev_err(dev, "failed to register extcon device\n");
86 return ret;
87 }
88
89 info->debounce_jiffies = msecs_to_jiffies(USB_ID_DEBOUNCE_MS);
90 INIT_DELAYED_WORK(&info->wq_detcable, qcom_usb_extcon_detect_cable);
91
92 info->irq = platform_get_irq_byname(pdev, "usb_id");
93 if (info->irq < 0)
94 return info->irq;
95
96 ret = devm_request_threaded_irq(dev, info->irq, NULL,
97 qcom_usb_irq_handler,
98 IRQF_TRIGGER_RISING |
99 IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
100 pdev->name, info);
101 if (ret < 0) {
102 dev_err(dev, "failed to request handler for ID IRQ\n");
103 return ret;
104 }
105
106 platform_set_drvdata(pdev, info);
107 device_init_wakeup(dev, 1);
108
109 /* Perform initial detection */
110 qcom_usb_extcon_detect_cable(&info->wq_detcable.work);
111
112 return 0;
113}
114
115static int qcom_usb_extcon_remove(struct platform_device *pdev)
116{
117 struct qcom_usb_extcon_info *info = platform_get_drvdata(pdev);
118
119 cancel_delayed_work_sync(&info->wq_detcable);
120
121 return 0;
122}
123
124#ifdef CONFIG_PM_SLEEP
125static int qcom_usb_extcon_suspend(struct device *dev)
126{
127 struct qcom_usb_extcon_info *info = dev_get_drvdata(dev);
128 int ret = 0;
129
130 if (device_may_wakeup(dev))
131 ret = enable_irq_wake(info->irq);
132
133 return ret;
134}
135
136static int qcom_usb_extcon_resume(struct device *dev)
137{
138 struct qcom_usb_extcon_info *info = dev_get_drvdata(dev);
139 int ret = 0;
140
141 if (device_may_wakeup(dev))
142 ret = disable_irq_wake(info->irq);
143
144 return ret;
145}
146#endif
147
148static SIMPLE_DEV_PM_OPS(qcom_usb_extcon_pm_ops,
149 qcom_usb_extcon_suspend, qcom_usb_extcon_resume);
150
151static const struct of_device_id qcom_usb_extcon_dt_match[] = {
152 { .compatible = "qcom,pm8941-misc", },
153 { }
154};
155MODULE_DEVICE_TABLE(of, qcom_usb_extcon_dt_match);
156
157static struct platform_driver qcom_usb_extcon_driver = {
158 .probe = qcom_usb_extcon_probe,
159 .remove = qcom_usb_extcon_remove,
160 .driver = {
161 .name = "extcon-pm8941-misc",
162 .pm = &qcom_usb_extcon_pm_ops,
163 .of_match_table = qcom_usb_extcon_dt_match,
164 },
165};
166module_platform_driver(qcom_usb_extcon_driver);
167
168MODULE_DESCRIPTION("QCOM USB ID extcon driver");
169MODULE_AUTHOR("Stephen Boyd <stephen.boyd@linaro.org>");
170MODULE_LICENSE("GPL v2");