This patch adds support for usb role swap via sysfs "role".
For example:
1) Connect a usb cable using 2 Salvator-X boards.
- For A-Device, the cable is connected to CN11 (USB3.0 ch0).
- For B-Device, the cable is connected to CN9 (USB2.0 ch0).
2) On A-Device, you input the following command:
# echo peripheral > /sys/devices/platform/soc/ee020000.usb/role
3) On B-Device, you input the following command:
# echo host > /sys/devices/platform/soc/ee080200.usb-phy/role
Then, the A-Device acts as a peripheral and the B-Device acts as
a host. Please note that A-Device must input the following command
if you want the board to act as a host again.
# echo host > /sys/devices/platform/soc/ee020000.usb/role
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
---
Changes from v3:
- Revise the doc about "What" from "<udc-name>" to "<renesas_usb3's name>".
- Rebase the latest Felipe's usb.git / testing/next branch.
.../ABI/testing/sysfs-platform-renesas_usb3 | 15 ++++++
drivers/usb/gadget/udc/renesas_usb3.c | 56 ++++++++++++++++++++++
2 files changed, 71 insertions(+)
create mode 100644 Documentation/ABI/testing/sysfs-platform-renesas_usb3
diff --git a/Documentation/ABI/testing/sysfs-platform-renesas_usb3 b/Documentation/ABI/testing/sysfs-platform-renesas_usb3
new file mode 100644
index 0000000..5621c15
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-platform-renesas_usb3
@@ -0,0 +1,15 @@
+What: /sys/devices/platform/<renesas_usb3's name>/role
+Date: March 2017
+KernelVersion: 4.13
+Contact: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
+Description:
+ This file can be read and write.
+ The file can show/change the drd mode of usb.
+
+ Write the following string to change the mode:
+ "host" - switching mode from peripheral to host.
+ "peripheral" - switching mode from host to peripheral.
+
+ Read the file, then it shows the following strings:
+ "host" - The mode is host now.
+ "peripheral" - The mode is peripheral now.
diff --git a/drivers/usb/gadget/udc/renesas_usb3.c b/drivers/usb/gadget/udc/renesas_usb3.c
index a1e79fc..5a2d845 100644
--- a/drivers/usb/gadget/udc/renesas_usb3.c
+++ b/drivers/usb/gadget/udc/renesas_usb3.c
@@ -372,6 +372,11 @@ static void usb3_disable_pipe_irq(struct renesas_usb3 *usb3, int num)
usb3_clear_bit(usb3, USB_INT_2_PIPE(num), USB3_USB_INT_ENA_2);
}
+static bool usb3_is_host(struct renesas_usb3 *usb3)
+{
+ return !(usb3_read(usb3, USB3_DRD_CON) & DRD_CON_PERI_CON);
+}
+
static void usb3_init_axi_bridge(struct renesas_usb3 *usb3)
{
/* Set AXI_INT */
@@ -576,8 +581,14 @@ static void usb3_vbus_out(struct renesas_usb3 *usb3, bool enable)
static void usb3_mode_config(struct renesas_usb3 *usb3, bool host, bool a_dev)
{
+ unsigned long flags;
+
+ spin_lock_irqsave(&usb3->lock, flags);
usb3_set_mode(usb3, host);
usb3_vbus_out(usb3, a_dev);
+ if (!host && a_dev) /* for A-Peripheral */
+ usb3_connect(usb3);
+ spin_unlock_irqrestore(&usb3->lock, flags);
}
static bool usb3_is_a_device(struct renesas_usb3 *usb3)
@@ -1837,11 +1848,49 @@ static int renesas_usb3_set_selfpowered(struct usb_gadget *gadget, int is_self)
.set_selfpowered = renesas_usb3_set_selfpowered,
};
+static ssize_t role_store(struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct renesas_usb3 *usb3 = dev_get_drvdata(dev);
+ bool new_mode_is_host;
+
+ if (!usb3->driver)
+ return -ENODEV;
+
+ if (!strncmp(buf, "host", strlen("host")))
+ new_mode_is_host = true;
+ else if (!strncmp(buf, "peripheral", strlen("peripheral")))
+ new_mode_is_host = false;
+ else
+ return -EINVAL;
+
+ if (new_mode_is_host == usb3_is_host(usb3))
+ return -EINVAL;
+
+ usb3_mode_config(usb3, new_mode_is_host, usb3_is_a_device(usb3));
+
+ return count;
+}
+
+static ssize_t role_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct renesas_usb3 *usb3 = dev_get_drvdata(dev);
+
+ if (!usb3->driver)
+ return -ENODEV;
+
+ return sprintf(buf, "%s\n", usb3_is_host(usb3) ? "host" : "peripheral");
+}
+static DEVICE_ATTR_RW(role);
+
/*------- platform_driver ------------------------------------------------*/
static int renesas_usb3_remove(struct platform_device *pdev)
{
struct renesas_usb3 *usb3 = platform_get_drvdata(pdev);
+ device_remove_file(&pdev->dev, &dev_attr_role);
+
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);
@@ -2044,6 +2093,10 @@ static int renesas_usb3_probe(struct platform_device *pdev)
if (ret < 0)
goto err_add_udc;
+ ret = device_create_file(&pdev->dev, &dev_attr_role);
+ if (ret < 0)
+ goto err_dev_create;
+
usb3->workaround_for_vbus = priv->workaround_for_vbus;
pm_runtime_enable(&pdev->dev);
@@ -2053,6 +2106,9 @@ static int renesas_usb3_probe(struct platform_device *pdev)
return 0;
+err_dev_create:
+ usb_del_gadget_udc(&usb3->gadget);
+
err_add_udc:
__renesas_usb3_ep_free_request(usb3->ep0_req);
--
1.9.1
