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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * extcon-qcom-spmi-misc.c - Qualcomm USB extcon driver to support USB ID4 * 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_SLEEP167static 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#endif197 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");220