--- /dev/null
+/*
+ * drivers/usb/misc/lvstest.c
+ *
+ * Test pattern generation for Link Layer Validation System Tests
+ *
+ * Copyright (C) 2014 ST Microelectronics
+ * Pratyush Anand <pratyush.anand@st.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/usb.h>
+#include <linux/usb/ch11.h>
+#include <linux/usb/hcd.h>
+#include <linux/usb/phy.h>
+
+struct lvs_rh {
+ /* root hub interface */
+ struct usb_interface *intf;
+ /* if lvs device connected */
+ bool present;
+ /* port no at which lvs device is present */
+ int portnum;
+ /* urb buffer */
+ u8 buffer[8];
+ /* class descriptor */
+ struct usb_hub_descriptor descriptor;
+ /* urb for polling interrupt pipe */
+ struct urb *urb;
+ /* LVS RH work queue */
+ struct workqueue_struct *rh_queue;
+ /* LVH RH work */
+ struct work_struct rh_work;
+ /* RH port status */
+ struct usb_port_status port_status;
+};
+
+static struct usb_device *create_lvs_device(struct usb_interface *intf)
+{
+ struct usb_device *udev, *hdev;
+ struct usb_hcd *hcd;
+ struct lvs_rh *lvs = usb_get_intfdata(intf);
+
+ if (!lvs->present) {
+ dev_err(&intf->dev, "No LVS device is present\n");
+ return NULL;
+ }
+
+ hdev = interface_to_usbdev(intf);
+ hcd = bus_to_hcd(hdev->bus);
+
+ udev = usb_alloc_dev(hdev, hdev->bus, lvs->portnum);
+ if (!udev) {
+ dev_err(&intf->dev, "Could not allocate lvs udev\n");
+ return NULL;
+ }
+ udev->speed = USB_SPEED_SUPER;
+ udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512);
+ usb_set_device_state(udev, USB_STATE_DEFAULT);
+
+ if (hcd->driver->enable_device) {
+ if (hcd->driver->enable_device(hcd, udev) < 0) {
+ dev_err(&intf->dev, "Failed to enable\n");
+ usb_put_dev(udev);
+ return NULL;
+ }
+ }
+
+ return udev;
+}
+
+static void destroy_lvs_device(struct usb_device *udev)
+{
+ struct usb_device *hdev = udev->parent;
+ struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
+
+ if (hcd->driver->free_dev)
+ hcd->driver->free_dev(hcd, udev);
+
+ usb_put_dev(udev);
+}
+
+static int lvs_rh_clear_port_feature(struct usb_device *hdev,
+ int port1, int feature)
+{
+ return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
+ USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
+ NULL, 0, 1000);
+}
+
+static int lvs_rh_set_port_feature(struct usb_device *hdev,
+ int port1, int feature)
+{
+ return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
+ USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
+ NULL, 0, 1000);
+}
+
+static ssize_t u3_entry_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_device *hdev = interface_to_usbdev(intf);
+ struct lvs_rh *lvs = usb_get_intfdata(intf);
+ struct usb_device *udev;
+ int ret;
+
+ udev = create_lvs_device(intf);
+ if (!udev) {
+ dev_err(dev, "failed to create lvs device\n");
+ return -ENOMEM;
+ }
+
+ ret = lvs_rh_set_port_feature(hdev, lvs->portnum,
+ USB_PORT_FEAT_SUSPEND);
+ if (ret < 0)
+ dev_err(dev, "can't issue U3 entry %d\n", ret);
+
+ destroy_lvs_device(udev);
+
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+static DEVICE_ATTR_WO(u3_entry);
+
+static ssize_t u3_exit_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_device *hdev = interface_to_usbdev(intf);
+ struct lvs_rh *lvs = usb_get_intfdata(intf);
+ struct usb_device *udev;
+ int ret;
+
+ udev = create_lvs_device(intf);
+ if (!udev) {
+ dev_err(dev, "failed to create lvs device\n");
+ return -ENOMEM;
+ }
+
+ ret = lvs_rh_clear_port_feature(hdev, lvs->portnum,
+ USB_PORT_FEAT_SUSPEND);
+ if (ret < 0)
+ dev_err(dev, "can't issue U3 exit %d\n", ret);
+
+ destroy_lvs_device(udev);
+
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+static DEVICE_ATTR_WO(u3_exit);
+
+static ssize_t hot_reset_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_device *hdev = interface_to_usbdev(intf);
+ struct lvs_rh *lvs = usb_get_intfdata(intf);
+ int ret;
+
+ ret = lvs_rh_set_port_feature(hdev, lvs->portnum,
+ USB_PORT_FEAT_RESET);
+ if (ret < 0) {
+ dev_err(dev, "can't issue hot reset %d\n", ret);
+ return ret;
+ }
+
+ return count;
+}
+static DEVICE_ATTR_WO(hot_reset);
+
+static ssize_t u2_timeout_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_device *hdev = interface_to_usbdev(intf);
+ struct lvs_rh *lvs = usb_get_intfdata(intf);
+ unsigned long val;
+ int ret;
+
+ ret = kstrtoul(buf, 10, &val);
+ if (ret < 0) {
+ dev_err(dev, "couldn't parse string %d\n", ret);
+ return ret;
+ }
+
+ if (val < 0 || val > 127)
+ return -EINVAL;
+
+ ret = lvs_rh_set_port_feature(hdev, lvs->portnum | (val << 8),
+ USB_PORT_FEAT_U2_TIMEOUT);
+ if (ret < 0) {
+ dev_err(dev, "Error %d while setting U2 timeout %ld\n", ret, val);
+ return ret;
+ }
+
+ return count;
+}
+static DEVICE_ATTR_WO(u2_timeout);
+
+static ssize_t u1_timeout_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_device *hdev = interface_to_usbdev(intf);
+ struct lvs_rh *lvs = usb_get_intfdata(intf);
+ unsigned long val;
+ int ret;
+
+ ret = kstrtoul(buf, 10, &val);
+ if (ret < 0) {
+ dev_err(dev, "couldn't parse string %d\n", ret);
+ return ret;
+ }
+
+ if (val < 0 || val > 127)
+ return -EINVAL;
+
+ ret = lvs_rh_set_port_feature(hdev, lvs->portnum | (val << 8),
+ USB_PORT_FEAT_U1_TIMEOUT);
+ if (ret < 0) {
+ dev_err(dev, "Error %d while setting U1 timeout %ld\n", ret, val);
+ return ret;
+ }
+
+ return count;
+}
+static DEVICE_ATTR_WO(u1_timeout);
+
+static ssize_t get_dev_desc_store(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_interface *intf = to_usb_interface(dev);
+ struct usb_device *udev;
+ struct usb_device_descriptor *descriptor;
+ int ret;
+
+ descriptor = kmalloc(sizeof(*descriptor), GFP_KERNEL);
+ if (!descriptor) {
+ dev_err(dev, "failed to allocate descriptor memory\n");
+ return -ENOMEM;
+ }
+
+ udev = create_lvs_device(intf);
+ if (!udev) {
+ dev_err(dev, "failed to create lvs device\n");
+ ret = -ENOMEM;
+ goto free_desc;
+ }
+
+ ret = usb_control_msg(udev, (PIPE_CONTROL << 30) | USB_DIR_IN,
+ USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, USB_DT_DEVICE << 8,
+ 0, descriptor, sizeof(*descriptor),
+ USB_CTRL_GET_TIMEOUT);
+ if (ret < 0)
+ dev_err(dev, "can't read device descriptor %d\n", ret);
+
+ destroy_lvs_device(udev);
+
+free_desc:
+ kfree(descriptor);
+
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+static DEVICE_ATTR_WO(get_dev_desc);
+
+static struct attribute *lvs_attributes[] = {
+ &dev_attr_get_dev_desc.attr,
+ &dev_attr_u1_timeout.attr,
+ &dev_attr_u2_timeout.attr,
+ &dev_attr_hot_reset.attr,
+ &dev_attr_u3_entry.attr,
+ &dev_attr_u3_exit.attr,
+ NULL
+};
+
+static const struct attribute_group lvs_attr_group = {
+ .attrs = lvs_attributes,
+};
+
+static void lvs_rh_work(struct work_struct *work)
+{
+ struct lvs_rh *lvs = container_of(work, struct lvs_rh, rh_work);
+ struct usb_interface *intf = lvs->intf;
+ struct usb_device *hdev = interface_to_usbdev(intf);
+ struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
+ struct usb_hub_descriptor *descriptor = &lvs->descriptor;
+ struct usb_port_status *port_status = &lvs->port_status;
+ int i, ret = 0;
+ u16 portchange;
+
+ /* Examine each root port */
+ for (i = 1; i <= descriptor->bNbrPorts; i++) {
+ ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
+ USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, i,
+ port_status, sizeof(*port_status), 1000);
+ if (ret < 4)
+ continue;
+
+ portchange = port_status->wPortChange;
+
+ if (portchange & USB_PORT_STAT_C_LINK_STATE)
+ lvs_rh_clear_port_feature(hdev, i,
+ USB_PORT_FEAT_C_PORT_LINK_STATE);
+ if (portchange & USB_PORT_STAT_C_ENABLE)
+ lvs_rh_clear_port_feature(hdev, i,
+ USB_PORT_FEAT_C_ENABLE);
+ if (portchange & USB_PORT_STAT_C_RESET)
+ lvs_rh_clear_port_feature(hdev, i,
+ USB_PORT_FEAT_C_RESET);
+ if (portchange & USB_PORT_STAT_C_BH_RESET)
+ lvs_rh_clear_port_feature(hdev, i,
+ USB_PORT_FEAT_C_BH_PORT_RESET);
+ if (portchange & USB_PORT_STAT_C_CONNECTION) {
+ lvs_rh_clear_port_feature(hdev, i,
+ USB_PORT_FEAT_C_CONNECTION);
+
+ if (port_status->wPortStatus &
+ USB_PORT_STAT_CONNECTION) {
+ lvs->present = true;
+ lvs->portnum = i;
+ if (hcd->phy)
+ usb_phy_notify_connect(hcd->phy,
+ USB_SPEED_SUPER);
+ } else {
+ lvs->present = false;
+ if (hcd->phy)
+ usb_phy_notify_disconnect(hcd->phy,
+ USB_SPEED_SUPER);
+ }
+ break;
+ }
+ }
+
+ ret = usb_submit_urb(lvs->urb, GFP_KERNEL);
+ if (ret != 0 && ret != -ENODEV && ret != -EPERM)
+ dev_err(&intf->dev, "urb resubmit error %d\n", ret);
+}
+
+static void lvs_rh_irq(struct urb *urb)
+{
+ struct lvs_rh *lvs = urb->context;
+
+ queue_work(lvs->rh_queue, &lvs->rh_work);
+}
+
+static int lvs_rh_probe(struct usb_interface *intf,
+ const struct usb_device_id *id)
+{
+ struct usb_device *hdev;
+ struct usb_host_interface *desc;
+ struct usb_endpoint_descriptor *endpoint;
+ struct lvs_rh *lvs;
+ unsigned int pipe;
+ int ret, maxp;
+
+ hdev = interface_to_usbdev(intf);
+ desc = intf->cur_altsetting;
+ endpoint = &desc->endpoint[0].desc;
+
+ /* valid only for SS root hub */
+ if (hdev->descriptor.bDeviceProtocol != USB_HUB_PR_SS || hdev->parent) {
+ dev_err(&intf->dev, "Bind LVS driver with SS root Hub only\n");
+ return -EINVAL;
+ }
+
+ lvs = devm_kzalloc(&intf->dev, sizeof(*lvs), GFP_KERNEL);
+ if (!lvs)
+ return -ENOMEM;
+
+ lvs->intf = intf;
+ usb_set_intfdata(intf, lvs);
+
+ /* how many number of ports this root hub has */
+ ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
+ USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
+ USB_DT_SS_HUB << 8, 0, &lvs->descriptor,
+ USB_DT_SS_HUB_SIZE, USB_CTRL_GET_TIMEOUT);
+ if (ret < (USB_DT_HUB_NONVAR_SIZE + 2)) {
+ dev_err(&hdev->dev, "wrong root hub descriptor read %d\n", ret);
+ return ret;
+ }
+
+ /* submit urb to poll interrupt endpoint */
+ lvs->urb = usb_alloc_urb(0, GFP_KERNEL);
+ if (!lvs->urb) {
+ dev_err(&intf->dev, "couldn't allocate lvs urb\n");
+ return -ENOMEM;
+ }
+
+ lvs->rh_queue = create_singlethread_workqueue("lvs_rh_queue");
+ if (!lvs->rh_queue) {
+ dev_err(&intf->dev, "couldn't create workqueue\n");
+ ret = -ENOMEM;
+ goto free_urb;
+ }
+
+ INIT_WORK(&lvs->rh_work, lvs_rh_work);
+
+ ret = sysfs_create_group(&intf->dev.kobj, &lvs_attr_group);
+ if (ret < 0) {
+ dev_err(&intf->dev, "Failed to create sysfs node %d\n", ret);
+ goto destroy_queue;
+ }
+
+ pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
+ maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
+ usb_fill_int_urb(lvs->urb, hdev, pipe, &lvs->buffer[0], maxp,
+ lvs_rh_irq, lvs, endpoint->bInterval);
+
+ ret = usb_submit_urb(lvs->urb, GFP_KERNEL);
+ if (ret < 0) {
+ dev_err(&intf->dev, "couldn't submit lvs urb %d\n", ret);
+ goto sysfs_remove;
+ }
+
+ return ret;
+
+sysfs_remove:
+ sysfs_remove_group(&intf->dev.kobj, &lvs_attr_group);
+destroy_queue:
+ destroy_workqueue(lvs->rh_queue);
+free_urb:
+ usb_free_urb(lvs->urb);
+ return ret;
+}
+
+static void lvs_rh_disconnect(struct usb_interface *intf)
+{
+ struct lvs_rh *lvs = usb_get_intfdata(intf);
+
+ sysfs_remove_group(&intf->dev.kobj, &lvs_attr_group);
+ destroy_workqueue(lvs->rh_queue);
+ usb_free_urb(lvs->urb);
+}
+
+static struct usb_driver lvs_driver = {
+ .name = "lvs",
+ .probe = lvs_rh_probe,
+ .disconnect = lvs_rh_disconnect,
+};
+
+module_usb_driver(lvs_driver);
+
+MODULE_DESCRIPTION("Link Layer Validation System Driver");
+MODULE_LICENSE("GPL");
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff