* PROSE I/O: Using 9p to enable Application Partitions
http://plan9.escet.urjc.es/iwp9/cready/PROSE_iwp9_2006.pdf
* VirtFS: A Virtualization Aware File System pass-through
- http://goo.gl/3WPDg
+ https://kernel.org/doc/ols/2010/ols2010-pages-109-120.pdf
Usage
=====
mount -t 9p -o trans=virtio <mount_tag> /mnt/9
- where mount_tag is the tag associated by the server to each of the exported
+ where mount_tag is the tag generated by the server to each of the exported
mount points. Each 9P export is seen by the client as a virtio device with an
associated "mount_tag" property. Available mount tags can be
seen by reading /sys/bus/virtio/drivers/9pnet_virtio/virtio<n>/mount_tag files.
+ USBG Usage
+ ==========
+
+ To mount a 9p FS on a USB Host accessible via the gadget at runtime::
+
+ mount -t 9p -o trans=usbg,aname=/path/to/fs <device> /mnt/9
+
+ To mount a 9p FS on a USB Host accessible via the gadget as root filesystem::
+
+ root=<device> rootfstype=9p rootflags=trans=usbg,cache=loose,uname=root,access=0,dfltuid=0,dfltgid=0,aname=/path/to/rootfs
+
+ where <device> is the tag associated by the usb gadget transport.
+ It is defined by the configfs instance name.
+
+ USBG Example
+ ============
+
+ The USB host exports a filesystem, while the gadget on the USB device
+ side makes it mountable.
+
+ Diod (9pfs server) and the forwarder are on the development host, where
+ the root filesystem is actually stored. The gadget is initialized during
+ boot (or later) on the embedded board. Then the forwarder will find it
+ on the USB bus and start forwarding requests.
+
+ In this case the 9p requests come from the device and are handled by the
+ host. The reason is that USB device ports are normally not available on
+ PCs, so a connection in the other direction would not work.
+
+ When using the usbg transport, for now there is no native usb host
+ service capable to handle the requests from the gadget driver. For
+ this we have to use the extra python tool p9_fwd.py from tools/usb.
+
+ Just start the 9pfs capable network server like diod/nfs-ganesha e.g.::
+
+ $ diod -f -n -d 0 -S -l 0.0.0.0:9999 -e $PWD
+
+ Optionaly scan your bus if there are more then one usbg gadgets to find their path::
+
+ $ python $kernel_dir/tools/usb/p9_fwd.py list
+
+ Bus | Addr | Manufacturer | Product | ID | Path
+ --- | ---- | ---------------- | ---------------- | --------- | ----
+ 2 | 67 | unknown | unknown | 1d6b:0109 | 2-1.1.2
+ 2 | 68 | unknown | unknown | 1d6b:0109 | 2-1.1.3
+
+ Then start the python transport::
+
+ $ python $kernel_dir/tools/usb/p9_fwd.py --path 2-1.1.2 connect -p 9999
+
+ After that the gadget driver can be used as described above.
+
+ One use-case is to use it as an alternative to NFS root booting during
+ the development of embedded Linux devices.
+
Options
=======
virtio connect to the next virtio channel available
(from QEMU with trans_virtio module)
rdma connect to a specified RDMA channel
+ usbg connect to a specified usb gadget channel
======== ============================================
uname=name user name to attempt mount as on the remote server. The
* Copyright(c) 2022, Analogix Semiconductor. All rights reserved.
*
*/
+ #include <linux/bitfield.h>
#include <linux/gpio/consumer.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
OCM_RESET);
ret |= anx7411_reg_write(ctx->tcpc_client, ANALOG_CTRL_10, 0x80);
/* Set TCPC to RD and DRP enable */
- cc1 = TCPC_ROLE_CTRL_CC_RD << TCPC_ROLE_CTRL_CC1_SHIFT;
- cc2 = TCPC_ROLE_CTRL_CC_RD << TCPC_ROLE_CTRL_CC2_SHIFT;
+ cc1 = FIELD_PREP(TCPC_ROLE_CTRL_CC1, TCPC_ROLE_CTRL_CC_RD);
+ cc2 = FIELD_PREP(TCPC_ROLE_CTRL_CC2, TCPC_ROLE_CTRL_CC_RD);
ret |= anx7411_reg_write(ctx->tcpc_client, TCPC_ROLE_CTRL,
TCPC_ROLE_CTRL_DRP | cc1 | cc2);
dev_err(dev, "failed to get GPIO IRQ\n");
}
-static enum power_supply_usb_type anx7411_psy_usb_types[] = {
- POWER_SUPPLY_USB_TYPE_C,
- POWER_SUPPLY_USB_TYPE_PD,
- POWER_SUPPLY_USB_TYPE_PD_PPS,
-};
-
static enum power_supply_property anx7411_psy_props[] = {
POWER_SUPPLY_PROP_USB_TYPE,
POWER_SUPPLY_PROP_ONLINE,
psy_desc->name = psy_name;
psy_desc->type = POWER_SUPPLY_TYPE_USB;
- psy_desc->usb_types = anx7411_psy_usb_types;
- psy_desc->num_usb_types = ARRAY_SIZE(anx7411_psy_usb_types);
+ psy_desc->usb_types = BIT(POWER_SUPPLY_USB_TYPE_C) |
+ BIT(POWER_SUPPLY_USB_TYPE_PD) |
+ BIT(POWER_SUPPLY_USB_TYPE_PD_PPS);
psy_desc->properties = anx7411_psy_props;
psy_desc->num_properties = ARRAY_SIZE(anx7411_psy_props);
{.compatible = "analogix,anx7411",},
{},
};
+ MODULE_DEVICE_TABLE(of, anx_match_table);
static struct i2c_driver anx7411_driver = {
.driver = {
POWER_SUPPLY_PROP_ONLINE,
};
-static enum power_supply_usb_type tps6598x_psy_usb_types[] = {
- POWER_SUPPLY_USB_TYPE_C,
- POWER_SUPPLY_USB_TYPE_PD,
-};
-
static const char *tps6598x_psy_name_prefix = "tps6598x-source-psy-";
/*
tps->psy_desc.name = psy_name;
tps->psy_desc.type = POWER_SUPPLY_TYPE_USB;
- tps->psy_desc.usb_types = tps6598x_psy_usb_types;
- tps->psy_desc.num_usb_types = ARRAY_SIZE(tps6598x_psy_usb_types);
+ tps->psy_desc.usb_types = BIT(POWER_SUPPLY_USB_TYPE_C) |
+ BIT(POWER_SUPPLY_USB_TYPE_PD);
tps->psy_desc.properties = tps6598x_psy_props;
tps->psy_desc.num_properties = ARRAY_SIZE(tps6598x_psy_props);
tps->psy_desc.get_property = tps6598x_psy_get_prop;
if (!client->irq)
cancel_delayed_work_sync(&tps->wq_poll);
+ else
+ devm_free_irq(tps->dev, client->irq, tps);
- devm_free_irq(tps->dev, client->irq, tps);
tps6598x_disconnect(tps, 0);
typec_unregister_port(tps->port);
usb_role_switch_put(tps->role_sw);
projects / J-linux.git / commitdiff