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 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 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 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 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 } 181 182 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