There are many Link Layer Tests which needs host to generate specific
traffic. This driver provides a way to do that.
For root hub n there would be different sysfs nodes corresponding to
each specific traffic generation case. For example:
1. To issue "Get Device descriptor" command for TD.7.06:
echo 1 > /sys/devices/platform/lvstestdev.n.auto/get_dev_desc
2. To set U1 timeout to 127 for TD.7.18
echo 127 > /sys/devices/platform/lvstestdev.n.auto/u1_timeout
3. To set U2 timeout to 0 for TD.7.18
echo 0 > /sys/devices/platform/lvstestdev.n.auto/u2_timeout
4. To issue "Hot Reset" for TD.7.29
echo 1 > /sys/devices/platform/lvstestdev.n.auto/hot_reset
Signed-off-by: Pratyush Anand <pratyush.anand@xxxxxx>
---
.../ABI/testing/sysfs-devices-platform-lvstestdev | 32 ++++
drivers/usb/misc/Kconfig | 6 +
drivers/usb/misc/Makefile | 1 +
drivers/usb/misc/lvstestdev.c | 171 +++++++++++++++++++++
4 files changed, 210 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-devices-platform-lvstestdev
create mode 100644 drivers/usb/misc/lvstestdev.c
diff --git a/Documentation/ABI/testing/sysfs-devices-platform-lvstestdev b/Documentation/ABI/testing/sysfs-devices-platform-lvstestdev
new file mode 100644
index 0000000..49f5871
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-devices-platform-lvstestdev
@@ -0,0 +1,32 @@
+Link Layer Validation Device is a standard device for testing of Super
+Speed Link Layer tests.
+
+What: /sys/devices/platform/lvstestdev.n.auto/get_dev_desc
+Date: March 2014
+Contact: Pratyush Anand <pratyush.anand@xxxxxx>
+Description:
+ Write 1 to this node to issue "Get Device Descriptor"
+ for Link Layer Validation device. It is needed for TD.7.06.
+
+What: /sys/devices/platform/lvstestdev.n.auto/u1_timeout
+Date: March 2014
+Contact: Pratyush Anand <pratyush.anand@xxxxxx>
+Description:
+ Set "U1 timeout" for the downstream port where Link Layer
+ Validation device is connected. It is needed for TD.7.18,
+ TD.7.19, TD.7.20 and TD.7.21.
+
+What: /sys/devices/platform/lvstestdev.n.auto/u2_timeout
+Date: March 2014
+Contact: Pratyush Anand <pratyush.anand@xxxxxx>
+Description:
+ Set "U2 timeout" for the downstream port where Link Layer
+ Validation device is connected. It is needed for TD.7.18,
+ TD.7.19, TD.7.20 and TD.7.21.
+
+What: /sys/devices/platform/lvstestdev.n.auto/hot_reset
+Date: March 2014
+Contact: Pratyush Anand <pratyush.anand@xxxxxx>
+Description:
+ Write 1 to this node to issue "Reset" for Link Layer Validation
+ device. It is needed for TD.7.29, TD.7.31, TD.7.34 and TD.7.35.
diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig
index a51e7d6..6ef1f81 100644
--- a/drivers/usb/misc/Kconfig
+++ b/drivers/usb/misc/Kconfig
@@ -235,3 +235,9 @@ config USB_HSIC_USB3503
depends on I2C
help
This option enables support for SMSC USB3503 HSIC to USB 2.0 Driver.
+
+config USB_LINK_LAYER_TEST
+ tristate "USB Link Layer Test driver"
+ help
+ This driver is for generating specific traffic for Super Speed Link
+ Layer Test Device.
diff --git a/drivers/usb/misc/Makefile b/drivers/usb/misc/Makefile
index 3e1bd70..6995c82 100644
--- a/drivers/usb/misc/Makefile
+++ b/drivers/usb/misc/Makefile
@@ -29,3 +29,4 @@ obj-$(CONFIG_USB_YUREX) += yurex.o
obj-$(CONFIG_USB_HSIC_USB3503) += usb3503.o
obj-$(CONFIG_USB_SISUSBVGA) += sisusbvga/
+obj-$(CONFIG_USB_LINK_LAYER_TEST) += lvstestdev.o
diff --git a/drivers/usb/misc/lvstestdev.c b/drivers/usb/misc/lvstestdev.c
new file mode 100644
index 0000000..58027a6
--- /dev/null
+++ b/drivers/usb/misc/lvstestdev.c
@@ -0,0 +1,171 @@
+/*
+ * drivers/usb/misc/lvstestdev.c
+ *
+ * Test pattern generation for Link Layer Validation System Tests
+ *
+ * Copyright (C) 2014 ST Microelectronics
+ * Pratyush Anand <pratyush.anand@xxxxxx>
+ *
+ * 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/usb.h>
+#include <linux/usb/ch11.h>
+
+static ssize_t issue_hot_reset(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_device **pudev = dev_get_platdata(dev);
+ struct usb_device *udev = *pudev;
+ unsigned long val = simple_strtoul(buf, NULL, 10);
+ int ret;
+
+ if (val != 1)
+ return -EINVAL;
+
+ ret = usb_control_msg(udev->parent, usb_sndctrlpipe(udev->parent, 0),
+ USB_REQ_SET_FEATURE, USB_RT_PORT, USB_PORT_FEAT_RESET,
+ udev->portnum, NULL, 0, 1000);
+ if (ret < 0) {
+ dev_err(dev, "can't issue hot reset %d\n", ret);
+ return ret;
+ }
+
+ return count;
+}
+static DEVICE_ATTR(hot_reset, S_IWUSR, NULL, issue_hot_reset);
+
+static ssize_t issue_u2_timeout(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_device **pudev = dev_get_platdata(dev);
+ struct usb_device *udev = *pudev;
+ unsigned long val = simple_strtoul(buf, NULL, 10);
+ int ret;
+
+ if (val != 0 && val != 0x7F)
+ return -EINVAL;
+
+ ret = usb_control_msg(udev->parent, usb_sndctrlpipe(udev->parent, 0),
+ USB_REQ_SET_FEATURE, USB_RT_PORT, USB_PORT_FEAT_U2_TIMEOUT,
+ udev->portnum | (((val) & 0xff) << 8), NULL, 0, 1000);
+ if (ret < 0) {
+ dev_err(dev, "can't set u2 Timeout %d\n", ret);
+ return ret;
+ }
+
+ return count;
+}
+static DEVICE_ATTR(u2_timeout, S_IWUSR, NULL, issue_u2_timeout);
+
+static ssize_t issue_u1_timeout(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_device **pudev = dev_get_platdata(dev);
+ struct usb_device *udev = *pudev;
+ unsigned long val = simple_strtoul(buf, NULL, 10);
+ int ret;
+
+ if (val != 0 && val != 0x7F)
+ return -EINVAL;
+
+ ret = usb_control_msg(udev->parent, usb_sndctrlpipe(udev->parent, 0),
+ USB_REQ_SET_FEATURE, USB_RT_PORT, USB_PORT_FEAT_U1_TIMEOUT,
+ udev->portnum | (((val) & 0xff) << 8), NULL, 0, 1000);
+ if (ret < 0) {
+ dev_err(dev, "can't set U1 Timeout %d\n", ret);
+ return ret;
+ }
+
+ return count;
+}
+static DEVICE_ATTR(u1_timeout, S_IWUSR, NULL, issue_u1_timeout);
+
+static ssize_t issue_get_device_descriptor(struct device *dev,
+ struct device_attribute *attr, const char *buf, size_t count)
+{
+ struct usb_device **pudev = dev_get_platdata(dev);
+ struct usb_device *udev = *pudev;
+ unsigned long val = simple_strtoul(buf, NULL, 10);
+ int ret;
+
+ if (val != 1)
+ return -EINVAL;
+
+ ret = usb_control_msg(udev, (PIPE_CONTROL << 30) | USB_DIR_IN,
+ USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, USB_DT_DEVICE << 8,
+ 0, &udev->descriptor, sizeof(udev->descriptor),
+ USB_CTRL_GET_TIMEOUT);
+ if (ret < 0) {
+ dev_err(dev, "can't read device descriptor %d\n", ret);
+ return ret;
+ }
+
+ return count;
+}
+static DEVICE_ATTR(get_dev_desc, S_IWUSR, NULL, issue_get_device_descriptor);
+
+static struct attribute *lvstestdev_attributes[] = {
+ &dev_attr_get_dev_desc.attr,
+ &dev_attr_u1_timeout.attr,
+ &dev_attr_u2_timeout.attr,
+ &dev_attr_hot_reset.attr,
+ NULL
+};
+
+static const struct attribute_group lvstestdev_attr_group = {
+ .attrs = lvstestdev_attributes,
+};
+
+static int
+lvstestdev_probe(struct platform_device *pdev)
+{
+ struct usb_device **pudev;
+ int ret;
+
+ pudev = dev_get_platdata(&pdev->dev);
+ if (!pudev) {
+ dev_err(&pdev->dev, "No udev with this device\n");
+ return -EINVAL;
+ }
+
+ ret = sysfs_create_group(&pdev->dev.kobj, &lvstestdev_attr_group);
+
+ return 0;
+}
+
+static int lvstestdev_remove(struct platform_device *pdev)
+{
+ sysfs_remove_group(&pdev->dev.kobj, &lvstestdev_attr_group);
+
+ return 0;
+}
+
+static struct platform_driver lvstestdev_driver = {
+ .probe = lvstestdev_probe,
+ .remove = lvstestdev_remove,
+ .driver = {
+ .name = "lvstestdev",
+ },
+};
+
+static int __init lvstestdev_init(void)
+{
+ return platform_driver_register(&lvstestdev_driver);
+}
+module_init(lvstestdev_init);
+
+static void __exit lvstestdev_exit(void)
+{
+ platform_driver_unregister(&lvstestdev_driver);
+}
+module_exit(lvstestdev_exit);
+
+MODULE_DESCRIPTION("Link Layer Validation System Test Driver");
+MODULE_LICENSE("GPL");
--
1.8.1.2
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