@@ -12859,6 +12859,13 @@ T: git git://linuxtv.org/media_tree.git
F: Documentation/devicetree/bindings/media/i2c/ov9650.txt
F: drivers/media/i2c/ov9650.c
+ONBOARD USB HUB DRIVER
+M: Matthias Kaehlcke <mka@chromium.org>
+L: linux-usb@vger.kernel.org
+S: Maintained
+F: Documentation/devicetree/bindings/usb/onboard_usb_hub.yaml
+F: drivers/usb/misc/onboard_usb_hub.c
+
ONENAND FLASH DRIVER
M: Kyungmin Park <kyungmin.park@samsung.com>
L: linux-mtd@lists.infradead.org
@@ -275,3 +275,20 @@ config USB_CHAOSKEY
To compile this driver as a module, choose M here: the
module will be called chaoskey.
+
+config USB_ONBOARD_HUB
+ tristate "Onboard USB hub support"
+ depends on OF || COMPILE_TEST
+ help
+ Say Y here if you want to support discrete onboard USB hubs that
+ don't require an additional control bus for initialization, but
+ need some nontrivial form of initialization, such as enabling a
+ power regulator. An example for such a hub is the Realtek
+ RTS5411.
+
+ The driver can be configured to turn off the power of the hub
+ during system suspend. This may reduce power consumption while
+ the system is suspended.
+
+ To compile this driver as a module, choose M here: the
+ module will be called onboard_usb_hub.
@@ -31,3 +31,4 @@ obj-$(CONFIG_USB_CHAOSKEY) += chaoskey.o
obj-$(CONFIG_USB_SISUSBVGA) += sisusbvga/
obj-$(CONFIG_USB_LINK_LAYER_TEST) += lvstest.o
+obj-$(CONFIG_USB_ONBOARD_HUB) += onboard_usb_hub.o
new file mode 100644
@@ -0,0 +1,371 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for onboard USB hubs
+ *
+ * Copyright (c) 2020, Google LLC
+ */
+
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/regulator/consumer.h>
+#include <linux/suspend.h>
+#include <linux/usb.h>
+#include <linux/usb/hcd.h>
+
+/************************** Platform driver **************************/
+
+struct udev_node {
+ struct usb_device *udev;
+ struct list_head list;
+};
+
+struct onboard_hub {
+ struct regulator *vdd;
+ struct device *dev;
+ bool power_off_in_suspend;
+ bool is_powered_on;
+ bool going_away;
+ struct list_head udev_list;
+ struct mutex lock;
+};
+
+static int onboard_hub_power_on(struct onboard_hub *hub)
+{
+ int err;
+
+ err = regulator_enable(hub->vdd);
+ if (err) {
+ dev_err(hub->dev, "failed to enable regulator: %d\n", err);
+ return err;
+ }
+
+ hub->is_powered_on = true;
+
+ return 0;
+}
+
+static int onboard_hub_power_off(struct onboard_hub *hub)
+{
+ int err;
+
+ err = regulator_disable(hub->vdd);
+ if (err) {
+ dev_err(hub->dev, "failed to enable regulator: %d\n", err);
+ return err;
+ }
+
+ hub->is_powered_on = false;
+
+ return 0;
+}
+
+static int __maybe_unused onboard_hub_suspend(struct device *dev)
+{
+ struct onboard_hub *hub = dev_get_drvdata(dev);
+ struct udev_node *node;
+ bool power_off;
+ int rc = 0;
+
+ if (!hub->power_off_in_suspend)
+ return 0;
+
+ power_off = true;
+
+ mutex_lock(&hub->lock);
+
+ list_for_each_entry(node, &hub->udev_list, list) {
+ if (!device_may_wakeup(node->udev->bus->controller))
+ continue;
+
+ if (usb_wakeup_enabled_descendants(node->udev)) {
+ power_off = false;
+ break;
+ }
+ }
+
+ mutex_unlock(&hub->lock);
+
+ if (power_off)
+ rc = onboard_hub_power_off(hub);
+
+ return rc;
+}
+
+static int __maybe_unused onboard_hub_resume(struct device *dev)
+{
+ struct onboard_hub *hub = dev_get_drvdata(dev);
+ int rc = 0;
+
+ if (!hub->is_powered_on)
+ rc = onboard_hub_power_on(hub);
+
+ return rc;
+}
+
+static int onboard_hub_add_usbdev(struct onboard_hub *hub, struct usb_device *udev)
+{
+ struct udev_node *node;
+ int ret = 0;
+
+ mutex_lock(&hub->lock);
+
+ if (hub->going_away) {
+ ret = -EINVAL;
+ goto unlock;
+ }
+
+ node = devm_kzalloc(hub->dev, sizeof(*node), GFP_KERNEL);
+ if (!node) {
+ ret = -ENOMEM;
+ goto unlock;
+ }
+
+ node->udev = udev;
+
+ list_add(&node->list, &hub->udev_list);
+
+unlock:
+ mutex_unlock(&hub->lock);
+
+ return ret;
+}
+
+static void onboard_hub_remove_usbdev(struct onboard_hub *hub, struct usb_device *udev)
+{
+ struct udev_node *node;
+
+ mutex_lock(&hub->lock);
+
+ list_for_each_entry(node, &hub->udev_list, list) {
+ if (node->udev == udev) {
+ list_del(&node->list);
+ break;
+ }
+ }
+
+ mutex_unlock(&hub->lock);
+}
+
+static ssize_t power_off_in_suspend_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct onboard_hub *hub = dev_get_drvdata(dev);
+
+ return sprintf(buf, "%d\n", hub->power_off_in_suspend);
+}
+
+static ssize_t power_off_in_suspend_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct onboard_hub *hub = dev_get_drvdata(dev);
+ bool val;
+ int ret;
+
+ ret = kstrtobool(buf, &val);
+ if (ret < 0)
+ return ret;
+
+ hub->power_off_in_suspend = val;
+
+ return count;
+}
+static DEVICE_ATTR_RW(power_off_in_suspend);
+
+static struct attribute *onboard_hub_sysfs_entries[] = {
+ &dev_attr_power_off_in_suspend.attr,
+ NULL,
+};
+
+static const struct attribute_group onboard_hub_sysfs_group = {
+ .attrs = onboard_hub_sysfs_entries,
+};
+
+static int onboard_hub_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct onboard_hub *hub;
+ int err;
+
+ hub = devm_kzalloc(dev, sizeof(*hub), GFP_KERNEL);
+ if (!hub)
+ return -ENOMEM;
+
+ hub->vdd = devm_regulator_get(dev, "vdd");
+ if (IS_ERR(hub->vdd))
+ return PTR_ERR(hub->vdd);
+
+ hub->dev = dev;
+ mutex_init(&hub->lock);
+ INIT_LIST_HEAD(&hub->udev_list);
+
+ dev_set_drvdata(dev, hub);
+
+ err = devm_device_add_group(dev, &onboard_hub_sysfs_group);
+ if (err) {
+ dev_err(dev, "failed to create sysfs entries: %d\n", err);
+ return err;
+ }
+
+ return onboard_hub_power_on(hub);
+}
+
+static int onboard_hub_remove(struct platform_device *pdev)
+{
+ struct onboard_hub *hub = dev_get_drvdata(&pdev->dev);
+ struct udev_node *node;
+ struct usb_device *udev;
+
+ hub->going_away = true;
+
+ mutex_lock(&hub->lock);
+
+ /* unbind the USB devices to avoid dangling references to this device */
+ while (!list_empty(&hub->udev_list)) {
+ node = list_first_entry(&hub->udev_list, struct udev_node, list);
+ udev = node->udev;
+
+ /*
+ * Unbinding the driver will call onboard_hub_remove_usbdev(),
+ * which acquires hub->lock. We must release the lock first.
+ */
+ get_device(&udev->dev);
+ mutex_unlock(&hub->lock);
+ device_release_driver(&udev->dev);
+ put_device(&udev->dev);
+ mutex_lock(&hub->lock);
+ }
+
+ mutex_unlock(&hub->lock);
+
+ return onboard_hub_power_off(hub);
+}
+
+static const struct of_device_id onboard_hub_match[] = {
+ { .compatible = "onboard-usb-hub" },
+ { .compatible = "realtek,rts5411" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, onboard_hub_match);
+
+static SIMPLE_DEV_PM_OPS(onboard_hub_pm_ops, onboard_hub_suspend, onboard_hub_resume);
+
+static struct platform_driver onboard_hub_driver = {
+ .probe = onboard_hub_probe,
+ .remove = onboard_hub_remove,
+
+ .driver = {
+ .name = "onboard-usb-hub",
+ .of_match_table = onboard_hub_match,
+ .pm = pm_ptr(&onboard_hub_pm_ops),
+ },
+};
+
+/************************** USB driver **************************/
+
+#define VENDOR_ID_REALTEK 0x0bda
+
+static struct onboard_hub *_find_onboard_hub(struct device *dev)
+{
+ const phandle *ph;
+ struct device_node *np;
+ struct platform_device *pdev;
+
+ ph = of_get_property(dev->of_node, "hub", NULL);
+ if (!ph) {
+ dev_err(dev, "failed to read 'hub' property\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ np = of_find_node_by_phandle(be32_to_cpu(*ph));
+ if (!np) {
+ dev_err(dev, "failed find device node for onboard hub\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ pdev = of_find_device_by_node(np);
+ of_node_put(np);
+ if (!pdev)
+ return ERR_PTR(-EPROBE_DEFER);
+
+ put_device(&pdev->dev);
+
+ return dev_get_drvdata(&pdev->dev);
+}
+
+static int onboard_hub_usbdev_probe(struct usb_device *udev)
+{
+ struct device *dev = &udev->dev;
+ struct onboard_hub *hub;
+
+ /* ignore supported hubs without device tree node */
+ if (!dev->of_node)
+ return -ENODEV;
+
+ hub = _find_onboard_hub(dev);
+ if (IS_ERR(hub))
+ return PTR_ERR(hub);
+
+ dev_set_drvdata(dev, hub);
+
+ return onboard_hub_add_usbdev(hub, udev);
+}
+
+static void onboard_hub_usbdev_disconnect(struct usb_device *udev)
+{
+ struct onboard_hub *hub = dev_get_drvdata(&udev->dev);
+
+ onboard_hub_remove_usbdev(hub, udev);
+}
+
+static const struct usb_device_id onboard_hub_id_table[] = {
+ { USB_DEVICE(VENDOR_ID_REALTEK, 0x0411) }, /* RTS5411 USB 3.0 */
+ { USB_DEVICE(VENDOR_ID_REALTEK, 0x5411) }, /* RTS5411 USB 2.0 */
+ {},
+};
+
+MODULE_DEVICE_TABLE(usb, onboard_hub_id_table);
+
+static struct usb_device_driver onboard_hub_usbdev_driver = {
+
+ .name = "onboard-usb-hub",
+ .probe = onboard_hub_usbdev_probe,
+ .disconnect = onboard_hub_usbdev_disconnect,
+ .generic_subclass = 1,
+ .supports_autosuspend = 1,
+ .id_table = onboard_hub_id_table,
+};
+
+/************************** Driver (de)registration **************************/
+
+static int __init onboard_hub_init(void)
+{
+ int ret;
+
+ ret = platform_driver_register(&onboard_hub_driver);
+ if (ret)
+ return ret;
+
+ ret = usb_register_device_driver(&onboard_hub_usbdev_driver, THIS_MODULE);
+ if (ret)
+ platform_driver_unregister(&onboard_hub_driver);
+
+ return ret;
+}
+module_init(onboard_hub_init);
+
+static void __exit onboard_hub_exit(void)
+{
+ usb_deregister_device_driver(&onboard_hub_usbdev_driver);
+ platform_driver_unregister(&onboard_hub_driver);
+}
+module_exit(onboard_hub_exit);
+
+MODULE_AUTHOR("Matthias Kaehlcke <mka@chromium.org>");
+MODULE_DESCRIPTION("Driver for discrete onboard USB hubs");
+MODULE_LICENSE("GPL v2");