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 <[email protected]> --- .../ABI/testing/sysfs-platform-renesas_usb3 | 15 +++++ drivers/usb/gadget/udc/renesas_usb3.c | 77 ++++++++++++++++++++++ 2 files changed, 92 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..1f63190 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-platform-renesas_usb3 @@ -0,0 +1,15 @@ +What: /sys/devices/platform/<udc-name>/role +Date: March 2017 +KernelVersion: 4.13 +Contact: Yoshihiro Shimoda <[email protected]> +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 3f04e57..5a4cd85 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 */ @@ -568,12 +573,29 @@ static void usb3_mode_a_host(struct renesas_usb3 *usb3) usb3_set_bit(usb3, DRD_CON_VBOUT, USB3_DRD_CON); } +static void usb3_mode_a_peri(struct renesas_usb3 *usb3) +{ + unsigned long flags; + + spin_lock_irqsave(&usb3->lock, flags); + usb3_set_bit(usb3, DRD_CON_PERI_CON, USB3_DRD_CON); + usb3_set_bit(usb3, DRD_CON_VBOUT, USB3_DRD_CON); + usb3_connect(usb3); + spin_unlock_irqrestore(&usb3->lock, flags); +} + static void usb3_mode_b_peri(struct renesas_usb3 *usb3) { usb3_set_bit(usb3, DRD_CON_PERI_CON, USB3_DRD_CON); usb3_clear_bit(usb3, DRD_CON_VBOUT, USB3_DRD_CON); } +static void usb3_mode_b_host(struct renesas_usb3 *usb3) +{ + usb3_clear_bit(usb3, DRD_CON_PERI_CON, USB3_DRD_CON); + usb3_clear_bit(usb3, DRD_CON_VBOUT, USB3_DRD_CON); +} + static bool usb3_is_a_device(struct renesas_usb3 *usb3) { return !(usb3_read(usb3, USB3_USB_OTG_STA) & USB_OTG_IDMON); @@ -1831,11 +1853,59 @@ 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; + + if (new_mode_is_host) { + if (usb3_is_a_device(usb3)) + usb3_mode_a_host(usb3); + else + usb3_mode_b_host(usb3); + } else { + if (usb3_is_a_device(usb3)) + usb3_mode_a_peri(usb3); + else + usb3_mode_b_peri(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); @@ -2038,6 +2108,10 @@ 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); @@ -2047,6 +2121,9 @@ 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
