Merge remote-tracking branch 'extcon/extcon-next'

[deliverable/linux.git] / drivers / extcon / extcon-qcom-spmi-misc.c

diff --git a/drivers/extcon/extcon-qcom-spmi-misc.c b/drivers/extcon/extcon-qcom-spmi-misc.c
new file mode 100644 (file)
index 0000000..ca957a5
--- /dev/null
+++ b/drivers/extcon/extcon-qcom-spmi-misc.c
@@ -0,0 +1,170 @@
+/**
+ * extcon-qcom-spmi-misc.c - Qualcomm USB extcon driver to support USB ID
+ *                             detection based on extcon-usb-gpio.c.
+ *
+ * Copyright (C) 2016 Linaro, Ltd.
+ * Stephen Boyd <stephen.boyd@linaro.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/extcon.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/workqueue.h>
+
+#define USB_ID_DEBOUNCE_MS     5       /* ms */
+
+struct qcom_usb_extcon_info {
+       struct extcon_dev *edev;
+       int irq;
+       struct delayed_work wq_detcable;
+       unsigned long debounce_jiffies;
+};
+
+static const unsigned int qcom_usb_extcon_cable[] = {
+       EXTCON_USB_HOST,
+       EXTCON_NONE,
+};
+
+static void qcom_usb_extcon_detect_cable(struct work_struct *work)
+{
+       bool id;
+       int ret;
+       struct qcom_usb_extcon_info *info = container_of(to_delayed_work(work),
+                                                   struct qcom_usb_extcon_info,
+                                                   wq_detcable);
+
+       /* check ID and update cable state */
+       ret = irq_get_irqchip_state(info->irq, IRQCHIP_STATE_LINE_LEVEL, &id);
+       if (ret)
+               return;
+
+       extcon_set_state(info->edev, EXTCON_USB_HOST, !id);
+}
+
+static irqreturn_t qcom_usb_irq_handler(int irq, void *dev_id)
+{
+       struct qcom_usb_extcon_info *info = dev_id;
+
+       queue_delayed_work(system_power_efficient_wq, &info->wq_detcable,
+                          info->debounce_jiffies);
+
+       return IRQ_HANDLED;
+}
+
+static int qcom_usb_extcon_probe(struct platform_device *pdev)
+{
+       struct device *dev = &pdev->dev;
+       struct qcom_usb_extcon_info *info;
+       int ret;
+
+       info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
+       if (!info)
+               return -ENOMEM;
+
+       info->edev = devm_extcon_dev_allocate(dev, qcom_usb_extcon_cable);
+       if (IS_ERR(info->edev)) {
+               dev_err(dev, "failed to allocate extcon device\n");
+               return -ENOMEM;
+       }
+
+       ret = devm_extcon_dev_register(dev, info->edev);
+       if (ret < 0) {
+               dev_err(dev, "failed to register extcon device\n");
+               return ret;
+       }
+
+       info->debounce_jiffies = msecs_to_jiffies(USB_ID_DEBOUNCE_MS);
+       INIT_DELAYED_WORK(&info->wq_detcable, qcom_usb_extcon_detect_cable);
+
+       info->irq = platform_get_irq_byname(pdev, "usb_id");
+       if (info->irq < 0)
+               return info->irq;
+
+       ret = devm_request_threaded_irq(dev, info->irq, NULL,
+                                       qcom_usb_irq_handler,
+                                       IRQF_TRIGGER_RISING |
+                                       IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
+                                       pdev->name, info);
+       if (ret < 0) {
+               dev_err(dev, "failed to request handler for ID IRQ\n");
+               return ret;
+       }
+
+       platform_set_drvdata(pdev, info);
+       device_init_wakeup(dev, 1);
+
+       /* Perform initial detection */
+       qcom_usb_extcon_detect_cable(&info->wq_detcable.work);
+
+       return 0;
+}
+
+static int qcom_usb_extcon_remove(struct platform_device *pdev)
+{
+       struct qcom_usb_extcon_info *info = platform_get_drvdata(pdev);
+
+       cancel_delayed_work_sync(&info->wq_detcable);
+
+       return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int qcom_usb_extcon_suspend(struct device *dev)
+{
+       struct qcom_usb_extcon_info *info = dev_get_drvdata(dev);
+       int ret = 0;
+
+       if (device_may_wakeup(dev))
+               ret = enable_irq_wake(info->irq);
+
+       return ret;
+}
+
+static int qcom_usb_extcon_resume(struct device *dev)
+{
+       struct qcom_usb_extcon_info *info = dev_get_drvdata(dev);
+       int ret = 0;
+
+       if (device_may_wakeup(dev))
+               ret = disable_irq_wake(info->irq);
+
+       return ret;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(qcom_usb_extcon_pm_ops,
+                        qcom_usb_extcon_suspend, qcom_usb_extcon_resume);
+
+static const struct of_device_id qcom_usb_extcon_dt_match[] = {
+       { .compatible = "qcom,pm8941-misc", },
+       { }
+};
+MODULE_DEVICE_TABLE(of, qcom_usb_extcon_dt_match);
+
+static struct platform_driver qcom_usb_extcon_driver = {
+       .probe          = qcom_usb_extcon_probe,
+       .remove         = qcom_usb_extcon_remove,
+       .driver         = {
+               .name   = "extcon-pm8941-misc",
+               .pm     = &qcom_usb_extcon_pm_ops,
+               .of_match_table = qcom_usb_extcon_dt_match,
+       },
+};
+module_platform_driver(qcom_usb_extcon_driver);
+
+MODULE_DESCRIPTION("QCOM USB ID extcon driver");
+MODULE_AUTHOR("Stephen Boyd <stephen.boyd@linaro.org>");
+MODULE_LICENSE("GPL v2");