Hi, > From: Felipe Balbi, Sent: Thursday, March 30, 2017 7:37 PM > > Hi, > > Yoshihiro Shimoda <[email protected]> writes: > > 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 | 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..1f63190 > > --- /dev/null > > +++ b/Documentation/ABI/testing/sysfs-platform-renesas_usb3 > > @@ -0,0 +1,15 @@ > > +What: /sys/devices/platform/<udc-name>/role > > I have one question here. This seems to imply that platform devices have > a "role" file which is not true for all platforms devices. I really > don't have a suggestion as to how this could/should be written out, > though :-s
Thank you for the comment. I think that this "<udc-name>" is not good keyword. Also actual name on a R-Car system (like /sys/device/platform/soc/ee020000.usb/role) is not good because this name also seems to imply that platform devices have a "role". So, I will change the "<udc-name>" to "<renesas_usb3's name>" as v4 patch. Since patch 1/3 and 2/3 had merged into your testing/next branch (thanks!), I will do rebase. Best regards, Yoshihiro Shimoda > Greg, any suggestions? > > (keeping patch below for reference only) > > > +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 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 > > > > -- > > To unsubscribe from this list: send the line "unsubscribe linux-usb" in > > the body of a message to [email protected] > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > -- > balbi
