Hi
On Sun, Apr 16, 2017 at 10:56 PM, Emmanuel Dreyfus wrote:
> I already asked the question hidden at the end of another message [1]:
> can we power-cycle a USB port? My understanding is that we have no way
> of doing it from userland, but what about from kernel? Even if the capability
> is hardware-dependent, it would be nice to have an ioctl to power off/power
> on a USB port.
There is a patch using sysctl.
Regards,
--
Kimihiro Nonaka
uhub(4): Add port power control sysctl node.
diff --git a/sys/dev/usb/uhub.c b/sys/dev/usb/uhub.c
index e5a9a13d710..33d3004ed5a 100644
--- a/sys/dev/usb/uhub.c
+++ b/sys/dev/usb/uhub.c
@@ -116,6 +116,8 @@ struct uhub_softc {
int sc_explorepending;
u_char sc_running;
+
+ struct sysctllog*sc_clog;
};
#define UHUB_IS_HIGH_SPEED(sc) \
@@ -127,7 +129,8 @@ struct uhub_softc {
Static usbd_status uhub_explore(struct usbd_device *);
Static void uhub_intr(struct usbd_xfer *, void *, usbd_status);
-
+Static int uhub_sysctl_port_power(SYSCTLFN_PROTO);
+Static int uhub_sysctl_port_reset(SYSCTLFN_PROTO);
/*
* We need two attachment points:
@@ -261,6 +264,8 @@ uhub_attach(device_t parent, device_t self, void *aux)
struct usbd_interface *iface;
usb_endpoint_descriptor_t *ed;
struct usbd_tt *tts = NULL;
+ const struct sysctlnode *rnode, *cnode, *node;
+ int error;
UHUBHIST_FUNC(); UHUBHIST_CALLED();
@@ -458,6 +463,58 @@ uhub_attach(device_t parent, device_t self, void *aux)
if (dev->ud_powersrc->up_parent != NULL)
usbd_delay_ms(dev, pwrdly);
+ /* Port power */
+ if ((dev->ud_hub->uh_hubdesc.wHubCharacteristics[0] & UHD_PWR) >=
+ UHD_PWR_NO_SWITCH)
+ goto sysctl_done;
+ if ((error = sysctl_createv(&sc->sc_clog, 0, NULL, &rnode,
+ CTLFLAG_PERMANENT, CTLTYPE_NODE, "uhub",
+ SYSCTL_DESCR("uhub global controls"),
+ NULL, 0, NULL, 0, CTL_HW, CTL_CREATE, CTL_EOL)) != 0) {
+ aprint_normal_dev(sc->sc_dev,
+ "couldn't create uhub global sysctl node\n");
+ goto sysctl_done;
+ }
+ if ((error = sysctl_createv(&sc->sc_clog, 0, &rnode, &rnode,
+ 0, CTLTYPE_NODE, device_xname(self),
+ SYSCTL_DESCR("per uhub controls"),
+ NULL, 0, NULL, 0, CTL_CREATE, CTL_EOL)) != 0) {
+ aprint_normal_dev(sc->sc_dev,
+ "couldn't create uhub sysctl node\n");
+ goto sysctl_done;
+ }
+ for (port = 1; port <= nports; port++) {
+ char buf[8];
+ snprintf(buf, sizeof(buf), "port%d", port);
+ if ((error = sysctl_createv(&sc->sc_clog, 0, &rnode, &cnode,
+ 0, CTLTYPE_NODE, buf,
+ SYSCTL_DESCR("uhub port controls"),
+ NULL, 0, NULL, 0, port, CTL_EOL)) != 0) {
+ aprint_normal_dev(sc->sc_dev,
+ "couldn't create uhub port sysctl node\n");
+ goto sysctl_done;
+ }
+ if ((error = sysctl_createv(&sc->sc_clog, 0, &cnode, &node,
+ CTLFLAG_READWRITE, CTLTYPE_INT, "power",
+ SYSCTL_DESCR("uhub port power control"),
+ uhub_sysctl_port_power, 0, (void *)sc, 0,
+ CTL_CREATE, CTL_EOL)) != 0) {
+ aprint_normal_dev(sc->sc_dev,
+ "couldn't create uhub port power sysctl node\n");
+ goto sysctl_done;
+ }
+ if ((error = sysctl_createv(&sc->sc_clog, 0, &cnode, &node,
+ CTLFLAG_READWRITE, CTLTYPE_INT, "reset",
+ SYSCTL_DESCR("uhub port reset control"),
+ uhub_sysctl_port_reset, 0, (void *)sc, 0,
+ CTL_CREATE, CTL_EOL)) != 0) {
+ aprint_normal_dev(sc->sc_dev,
+ "couldn't create uhub port reset sysctl node\n");
+ goto sysctl_done;
+ }
+ }
+sysctl_done:
+
/* The usual exploration will finish the setup. */
sc->sc_running = 1;
@@ -468,6 +525,7 @@ uhub_attach(device_t parent, device_t self, void *aux)
return;
bad:
+ sysctl_teardown(&sc->sc_clog);
if (sc->sc_status)
kmem_free(sc->sc_status, sc->sc_statuslen);
if (sc->sc_statuspend)
@@ -822,6 +880,8 @@ uhub_detach(device_t self, int flags)
/* XXXSMP usb */
KERNEL_LOCK(1, curlwp);
+ sysctl_teardown(&sc->sc_clog);
+
