drivers/extcon/extcon-qcom-spmi-misc.c

   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(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(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");