492 lines
12 KiB
C
492 lines
12 KiB
C
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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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* This file is licensed under the terms of the GNU General Public
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* License version 2. This program is licensed "as is" without any
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* warranty of any kind, whether express or implied.
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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 < 0 || 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 < 0 || 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);
|
||
|
|
|
||
|
|
if (le16_to_cpu(port_status->wPortStatus) &
|
||
|
|
USB_PORT_STAT_CONNECTION) {
|
||
|
|
lvs->present = true;
|
||
|
|
lvs->portnum = i;
|
||
|
|
if (hcd->usb_phy)
|
||
|
|
usb_phy_notify_connect(hcd->usb_phy,
|
||
|
|
USB_SPEED_SUPER);
|
||
|
|
} else {
|
||
|
|
lvs->present = false;
|
||
|
|
if (hcd->usb_phy)
|
||
|
|
usb_phy_notify_disconnect(hcd->usb_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;
|
||
|
|
|
||
|
|
schedule_work(&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;
|
||
|
|
|
||
|
|
if (desc->desc.bNumEndpoints < 1)
|
||
|
|
return -ENODEV;
|
||
|
|
|
||
|
|
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 < 0 ? ret : -EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* submit urb to poll interrupt endpoint */
|
||
|
|
lvs->urb = usb_alloc_urb(0, GFP_KERNEL);
|
||
|
|
if (!lvs->urb)
|
||
|
|
return -ENOMEM;
|
||
|
|
|
||
|
|
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 free_urb;
|
||
|
|
}
|
||
|
|
|
||
|
|
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);
|
||
|
|
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);
|
||
|
|
usb_poison_urb(lvs->urb); /* used in scheduled work */
|
||
|
|
flush_work(&lvs->rh_work);
|
||
|
|
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");
|