![Greg Kroah-Hartman](/assets/img/avatar_default.png)
Now that the SPDX tag is in all USB files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Keith Packard <keithp@keithp.com> Cc: Juergen Stuber <starblue@users.sourceforge.net> Cc: Cesar Miquel <miquel@df.uba.ar> Cc: Richard Leitner <richard.leitner@skidata.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
488 lines
12 KiB
C
488 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* drivers/usb/misc/lvstest.c
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*
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* Test pattern generation for Link Layer Validation System Tests
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*
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* Copyright (C) 2014 ST Microelectronics
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* Pratyush Anand <pratyush.anand@gmail.com>
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*/
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/usb.h>
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#include <linux/usb/ch11.h>
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#include <linux/usb/hcd.h>
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#include <linux/usb/phy.h>
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struct lvs_rh {
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/* root hub interface */
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struct usb_interface *intf;
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/* if lvs device connected */
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bool present;
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/* port no at which lvs device is present */
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int portnum;
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/* urb buffer */
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u8 buffer[8];
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/* class descriptor */
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struct usb_hub_descriptor descriptor;
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/* urb for polling interrupt pipe */
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struct urb *urb;
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/* LVH RH work */
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struct work_struct rh_work;
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/* RH port status */
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struct usb_port_status port_status;
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};
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static struct usb_device *create_lvs_device(struct usb_interface *intf)
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{
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struct usb_device *udev, *hdev;
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struct usb_hcd *hcd;
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struct lvs_rh *lvs = usb_get_intfdata(intf);
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if (!lvs->present) {
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dev_err(&intf->dev, "No LVS device is present\n");
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return NULL;
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}
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hdev = interface_to_usbdev(intf);
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hcd = bus_to_hcd(hdev->bus);
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udev = usb_alloc_dev(hdev, hdev->bus, lvs->portnum);
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if (!udev) {
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dev_err(&intf->dev, "Could not allocate lvs udev\n");
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return NULL;
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}
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udev->speed = USB_SPEED_SUPER;
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udev->ep0.desc.wMaxPacketSize = cpu_to_le16(512);
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usb_set_device_state(udev, USB_STATE_DEFAULT);
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if (hcd->driver->enable_device) {
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if (hcd->driver->enable_device(hcd, udev) < 0) {
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dev_err(&intf->dev, "Failed to enable\n");
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usb_put_dev(udev);
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return NULL;
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}
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}
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return udev;
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}
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static void destroy_lvs_device(struct usb_device *udev)
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{
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struct usb_device *hdev = udev->parent;
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struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
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if (hcd->driver->free_dev)
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hcd->driver->free_dev(hcd, udev);
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usb_put_dev(udev);
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}
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static int lvs_rh_clear_port_feature(struct usb_device *hdev,
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int port1, int feature)
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{
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return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
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USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
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NULL, 0, 1000);
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}
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static int lvs_rh_set_port_feature(struct usb_device *hdev,
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int port1, int feature)
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{
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return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
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USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
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NULL, 0, 1000);
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}
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static ssize_t u3_entry_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_device *hdev = interface_to_usbdev(intf);
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struct lvs_rh *lvs = usb_get_intfdata(intf);
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struct usb_device *udev;
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int ret;
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udev = create_lvs_device(intf);
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if (!udev) {
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dev_err(dev, "failed to create lvs device\n");
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return -ENOMEM;
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}
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ret = lvs_rh_set_port_feature(hdev, lvs->portnum,
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USB_PORT_FEAT_SUSPEND);
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if (ret < 0)
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dev_err(dev, "can't issue U3 entry %d\n", ret);
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destroy_lvs_device(udev);
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if (ret < 0)
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return ret;
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return count;
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}
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static DEVICE_ATTR_WO(u3_entry);
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static ssize_t u3_exit_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_device *hdev = interface_to_usbdev(intf);
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struct lvs_rh *lvs = usb_get_intfdata(intf);
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struct usb_device *udev;
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int ret;
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udev = create_lvs_device(intf);
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if (!udev) {
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dev_err(dev, "failed to create lvs device\n");
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return -ENOMEM;
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}
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ret = lvs_rh_clear_port_feature(hdev, lvs->portnum,
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USB_PORT_FEAT_SUSPEND);
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if (ret < 0)
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dev_err(dev, "can't issue U3 exit %d\n", ret);
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destroy_lvs_device(udev);
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if (ret < 0)
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return ret;
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return count;
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}
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static DEVICE_ATTR_WO(u3_exit);
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static ssize_t hot_reset_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_device *hdev = interface_to_usbdev(intf);
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struct lvs_rh *lvs = usb_get_intfdata(intf);
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int ret;
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ret = lvs_rh_set_port_feature(hdev, lvs->portnum,
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USB_PORT_FEAT_RESET);
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if (ret < 0) {
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dev_err(dev, "can't issue hot reset %d\n", ret);
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return ret;
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}
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return count;
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}
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static DEVICE_ATTR_WO(hot_reset);
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static ssize_t warm_reset_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_device *hdev = interface_to_usbdev(intf);
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struct lvs_rh *lvs = usb_get_intfdata(intf);
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int ret;
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ret = lvs_rh_set_port_feature(hdev, lvs->portnum,
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USB_PORT_FEAT_BH_PORT_RESET);
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if (ret < 0) {
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dev_err(dev, "can't issue warm reset %d\n", ret);
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return ret;
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}
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return count;
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}
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static DEVICE_ATTR_WO(warm_reset);
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static ssize_t u2_timeout_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_device *hdev = interface_to_usbdev(intf);
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struct lvs_rh *lvs = usb_get_intfdata(intf);
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unsigned long val;
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int ret;
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ret = kstrtoul(buf, 10, &val);
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if (ret < 0) {
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dev_err(dev, "couldn't parse string %d\n", ret);
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return ret;
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}
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if (val > 127)
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return -EINVAL;
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ret = lvs_rh_set_port_feature(hdev, lvs->portnum | (val << 8),
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USB_PORT_FEAT_U2_TIMEOUT);
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if (ret < 0) {
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dev_err(dev, "Error %d while setting U2 timeout %ld\n", ret, val);
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return ret;
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}
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return count;
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}
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static DEVICE_ATTR_WO(u2_timeout);
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static ssize_t u1_timeout_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_device *hdev = interface_to_usbdev(intf);
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struct lvs_rh *lvs = usb_get_intfdata(intf);
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unsigned long val;
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int ret;
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ret = kstrtoul(buf, 10, &val);
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if (ret < 0) {
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dev_err(dev, "couldn't parse string %d\n", ret);
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return ret;
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}
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if (val > 127)
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return -EINVAL;
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ret = lvs_rh_set_port_feature(hdev, lvs->portnum | (val << 8),
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USB_PORT_FEAT_U1_TIMEOUT);
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if (ret < 0) {
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dev_err(dev, "Error %d while setting U1 timeout %ld\n", ret, val);
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return ret;
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}
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return count;
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}
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static DEVICE_ATTR_WO(u1_timeout);
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static ssize_t get_dev_desc_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_device *udev;
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struct usb_device_descriptor *descriptor;
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int ret;
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descriptor = kmalloc(sizeof(*descriptor), GFP_KERNEL);
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if (!descriptor)
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return -ENOMEM;
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udev = create_lvs_device(intf);
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if (!udev) {
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dev_err(dev, "failed to create lvs device\n");
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ret = -ENOMEM;
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goto free_desc;
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}
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ret = usb_control_msg(udev, (PIPE_CONTROL << 30) | USB_DIR_IN,
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USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, USB_DT_DEVICE << 8,
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0, descriptor, sizeof(*descriptor),
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USB_CTRL_GET_TIMEOUT);
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if (ret < 0)
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dev_err(dev, "can't read device descriptor %d\n", ret);
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destroy_lvs_device(udev);
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free_desc:
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kfree(descriptor);
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if (ret < 0)
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return ret;
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return count;
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}
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static DEVICE_ATTR_WO(get_dev_desc);
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static ssize_t enable_compliance_store(struct device *dev,
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struct device_attribute *attr, const char *buf, size_t count)
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{
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struct usb_interface *intf = to_usb_interface(dev);
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struct usb_device *hdev = interface_to_usbdev(intf);
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struct lvs_rh *lvs = usb_get_intfdata(intf);
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int ret;
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ret = lvs_rh_set_port_feature(hdev,
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lvs->portnum | USB_SS_PORT_LS_COMP_MOD << 3,
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USB_PORT_FEAT_LINK_STATE);
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if (ret < 0) {
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dev_err(dev, "can't enable compliance mode %d\n", ret);
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return ret;
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}
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return count;
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}
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static DEVICE_ATTR_WO(enable_compliance);
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static struct attribute *lvs_attributes[] = {
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&dev_attr_get_dev_desc.attr,
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&dev_attr_u1_timeout.attr,
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&dev_attr_u2_timeout.attr,
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&dev_attr_hot_reset.attr,
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&dev_attr_warm_reset.attr,
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&dev_attr_u3_entry.attr,
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&dev_attr_u3_exit.attr,
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&dev_attr_enable_compliance.attr,
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NULL
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};
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static const struct attribute_group lvs_attr_group = {
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.attrs = lvs_attributes,
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};
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static void lvs_rh_work(struct work_struct *work)
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{
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struct lvs_rh *lvs = container_of(work, struct lvs_rh, rh_work);
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struct usb_interface *intf = lvs->intf;
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struct usb_device *hdev = interface_to_usbdev(intf);
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struct usb_hcd *hcd = bus_to_hcd(hdev->bus);
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struct usb_hub_descriptor *descriptor = &lvs->descriptor;
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struct usb_port_status *port_status = &lvs->port_status;
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int i, ret = 0;
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u16 portchange;
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/* Examine each root port */
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for (i = 1; i <= descriptor->bNbrPorts; i++) {
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ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
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USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, i,
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port_status, sizeof(*port_status), 1000);
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if (ret < 4)
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continue;
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portchange = le16_to_cpu(port_status->wPortChange);
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if (portchange & USB_PORT_STAT_C_LINK_STATE)
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lvs_rh_clear_port_feature(hdev, i,
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USB_PORT_FEAT_C_PORT_LINK_STATE);
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if (portchange & USB_PORT_STAT_C_ENABLE)
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lvs_rh_clear_port_feature(hdev, i,
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USB_PORT_FEAT_C_ENABLE);
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if (portchange & USB_PORT_STAT_C_RESET)
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lvs_rh_clear_port_feature(hdev, i,
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USB_PORT_FEAT_C_RESET);
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if (portchange & USB_PORT_STAT_C_BH_RESET)
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lvs_rh_clear_port_feature(hdev, i,
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USB_PORT_FEAT_C_BH_PORT_RESET);
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if (portchange & USB_PORT_STAT_C_CONNECTION) {
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lvs_rh_clear_port_feature(hdev, i,
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USB_PORT_FEAT_C_CONNECTION);
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if (le16_to_cpu(port_status->wPortStatus) &
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USB_PORT_STAT_CONNECTION) {
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lvs->present = true;
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lvs->portnum = i;
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if (hcd->usb_phy)
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usb_phy_notify_connect(hcd->usb_phy,
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USB_SPEED_SUPER);
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} else {
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lvs->present = false;
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if (hcd->usb_phy)
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usb_phy_notify_disconnect(hcd->usb_phy,
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USB_SPEED_SUPER);
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}
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break;
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}
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}
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ret = usb_submit_urb(lvs->urb, GFP_KERNEL);
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if (ret != 0 && ret != -ENODEV && ret != -EPERM)
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dev_err(&intf->dev, "urb resubmit error %d\n", ret);
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}
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static void lvs_rh_irq(struct urb *urb)
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{
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struct lvs_rh *lvs = urb->context;
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schedule_work(&lvs->rh_work);
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}
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static int lvs_rh_probe(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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struct usb_device *hdev;
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struct usb_host_interface *desc;
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struct usb_endpoint_descriptor *endpoint;
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struct lvs_rh *lvs;
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unsigned int pipe;
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int ret, maxp;
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hdev = interface_to_usbdev(intf);
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desc = intf->cur_altsetting;
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ret = usb_find_int_in_endpoint(desc, &endpoint);
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if (ret)
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return ret;
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/* valid only for SS root hub */
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if (hdev->descriptor.bDeviceProtocol != USB_HUB_PR_SS || hdev->parent) {
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dev_err(&intf->dev, "Bind LVS driver with SS root Hub only\n");
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return -EINVAL;
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}
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lvs = devm_kzalloc(&intf->dev, sizeof(*lvs), GFP_KERNEL);
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if (!lvs)
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return -ENOMEM;
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lvs->intf = intf;
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usb_set_intfdata(intf, lvs);
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/* how many number of ports this root hub has */
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ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
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USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
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USB_DT_SS_HUB << 8, 0, &lvs->descriptor,
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USB_DT_SS_HUB_SIZE, USB_CTRL_GET_TIMEOUT);
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if (ret < (USB_DT_HUB_NONVAR_SIZE + 2)) {
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dev_err(&hdev->dev, "wrong root hub descriptor read %d\n", ret);
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return ret;
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}
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/* submit urb to poll interrupt endpoint */
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lvs->urb = usb_alloc_urb(0, GFP_KERNEL);
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if (!lvs->urb)
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return -ENOMEM;
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INIT_WORK(&lvs->rh_work, lvs_rh_work);
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ret = sysfs_create_group(&intf->dev.kobj, &lvs_attr_group);
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if (ret < 0) {
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dev_err(&intf->dev, "Failed to create sysfs node %d\n", ret);
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goto free_urb;
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}
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pipe = usb_rcvintpipe(hdev, endpoint->bEndpointAddress);
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maxp = usb_maxpacket(hdev, pipe, usb_pipeout(pipe));
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usb_fill_int_urb(lvs->urb, hdev, pipe, &lvs->buffer[0], maxp,
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lvs_rh_irq, lvs, endpoint->bInterval);
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ret = usb_submit_urb(lvs->urb, GFP_KERNEL);
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if (ret < 0) {
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dev_err(&intf->dev, "couldn't submit lvs urb %d\n", ret);
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goto sysfs_remove;
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}
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return ret;
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sysfs_remove:
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sysfs_remove_group(&intf->dev.kobj, &lvs_attr_group);
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free_urb:
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usb_free_urb(lvs->urb);
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return ret;
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}
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static void lvs_rh_disconnect(struct usb_interface *intf)
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{
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struct lvs_rh *lvs = usb_get_intfdata(intf);
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sysfs_remove_group(&intf->dev.kobj, &lvs_attr_group);
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usb_poison_urb(lvs->urb); /* used in scheduled work */
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flush_work(&lvs->rh_work);
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usb_free_urb(lvs->urb);
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}
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static struct usb_driver lvs_driver = {
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.name = "lvs",
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.probe = lvs_rh_probe,
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.disconnect = lvs_rh_disconnect,
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};
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module_usb_driver(lvs_driver);
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MODULE_DESCRIPTION("Link Layer Validation System Driver");
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MODULE_LICENSE("GPL");
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