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laforge gerrit-no-reply at lists.osmocom.orglaforge has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-ccid-firmware/+/15499
Change subject: add small program to play with how Linux reacts to hubs with many ports
......................................................................
add small program to play with how Linux reacts to hubs with many ports
Change-Id: Ic3d2bec3f55f4d9e13183795c5825723f9427476
---
M ccid/Makefile
A ccid/hub_create_gadget.sh
A ccid/hub_main_functionfs.c
A ccid/hub_remove_gadget.sh
4 files changed, 589 insertions(+), 0 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-ccid-firmware refs/changes/99/15499/1
diff --git a/ccid/Makefile b/ccid/Makefile
index 3258967..0fadd22 100644
--- a/ccid/Makefile
+++ b/ccid/Makefile
@@ -3,6 +3,9 @@
ccid_functionfs: ccid_main_functionfs.o ccid_proto.o ccid_device.o ccid_slot_sim.o
$(CC) $(CFLAGS) -o $@ $^ -lasan -losmocore -ltalloc -laio
+hub_functionfs: hub_main_functionfs.o
+ $(CC) $(CFLAGS) -o $@ $^ -lasan -losmocore -ltalloc -laio
+
%.o: %.c
$(CC) $(CFLAGS) -o $@ -c $^
diff --git a/ccid/hub_create_gadget.sh b/ccid/hub_create_gadget.sh
new file mode 100755
index 0000000..3689c9f
--- /dev/null
+++ b/ccid/hub_create_gadget.sh
@@ -0,0 +1,48 @@
+#!/bin/bash
+
+GADGET_NAME=osmo-hub
+
+
+
+GADGET_CONFIGFS=/sys/kernel/config/usb_gadget
+
+die() {
+ echo ERROR: $1
+ exit 2
+}
+
+modprobe configfs
+modprobe usb_f_fs
+modprobe dummy_hcd is_high_speed=0 is_super_speed=0
+
+[ -d $GADGET_CONFIGFS ] || die "usb_gadget configfs not mounted"
+
+gadgetdir="$GADGET_CONFIGFS/$GADGET_NAME"
+
+# create gadget
+[ -d $gadgetdir ] || mkdir $gadgetdir || die "Cannot create $gadgetdir. Permission problem?"
+set -e -x
+cd $gadgetdir
+echo 0x2342 > idVendor
+echo 0x4200 > idProduct
+echo 0x09 > bDeviceClass
+echo 1 > bDeviceProtocol
+[ -d strings/0x409 ] || mkdir strings/0x409
+echo 2342 > strings/0x409/serialnumber
+echo "sysmocom GmbH" > strings/0x409/manufacturer
+echo "sysmoHUB" > strings/0x409/product
+
+# create config
+[ -d configs/c.1 ] || mkdir configs/c.1
+[ -d configs/c.1/strings/0x409 ] || mkdir configs/c.1/strings/0x409
+echo "sysmoHUB config" > configs/c.1/strings/0x409/configuration
+
+[ -d functions/ffs.usb0 ] || mkdir functions/ffs.usb0
+[ -e configs/c.1/ffs.usb0 ] || ln -s functions/ffs.usb0 configs/c.1
+
+[ -d /dev/ffs-hub ] || mkdir /dev/ffs-hub
+[ -e /dev/ffs-hub/ep0 ] || mount -t functionfs usb0 /dev/ffs-hub/
+
+# enable device, only works after program has opened EP FDs
+#echo dummy_udc.0 > UDC
+
diff --git a/ccid/hub_main_functionfs.c b/ccid/hub_main_functionfs.c
new file mode 100644
index 0000000..c019cde
--- /dev/null
+++ b/ccid/hub_main_functionfs.c
@@ -0,0 +1,505 @@
+
+#include <errno.h>
+#include <stdint.h>
+#include <endian.h>
+#include <signal.h>
+#include <sys/types.h>
+#include <linux/usb/functionfs.h>
+#include <linux/usb/ch11.h>
+
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+#define cpu_to_le16(x) (x)
+#define cpu_to_le32(x) (x)
+#else
+#define cpu_to_le16(x) ((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8))
+#define cpu_to_le32(x) \
+ ((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) | \
+ (((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24))
+#endif
+
+#define le32_to_cpu(x) le32toh(x)
+#define le16_to_cpu(x) le16toh(x)
+
+enum {
+ DUSB,
+};
+
+/***********************************************************************
+ * Actual USB Descriptors
+ ***********************************************************************/
+
+static const struct {
+ struct usb_functionfs_descs_head_v2 header;
+ __le32 fs_count;
+ struct {
+ struct usb_interface_descriptor intf;
+ struct usb_endpoint_descriptor_no_audio ep_int;
+ } __attribute__ ((packed)) fs_descs;
+} __attribute__ ((packed)) descriptors = {
+ .header = {
+ .magic = cpu_to_le32(FUNCTIONFS_DESCRIPTORS_MAGIC_V2),
+ .flags = cpu_to_le32(FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_ALL_CTRL_RECIP),
+ .length = cpu_to_le32(sizeof(descriptors)),
+ },
+ .fs_count = cpu_to_le32(2),
+ .fs_descs = {
+ .intf = {
+ .bLength = sizeof(descriptors.fs_descs.intf),
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bNumEndpoints = 1,
+ .bInterfaceClass = USB_CLASS_HUB,
+ .iInterface = 1,
+ },
+ .ep_int = {
+ .bLength = sizeof(descriptors.fs_descs.ep_int),
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = 1 | USB_DIR_IN,
+ .bmAttributes = USB_ENDPOINT_XFER_INT,
+ .wMaxPacketSize = 64,
+ .bInterval = 12,
+ },
+ },
+};
+
+#define STR_INTERFACE_ "Osmocom USB Hub"
+
+static const struct {
+ struct usb_functionfs_strings_head header;
+ struct {
+ __le16 code;
+ const char str1[sizeof(STR_INTERFACE_)];
+ } __attribute__((packed)) lang0;
+} __attribute__((packed)) strings = {
+ .header = {
+ .magic = cpu_to_le32(FUNCTIONFS_STRINGS_MAGIC),
+ .length = cpu_to_le32(sizeof(strings)),
+ .str_count = cpu_to_le32(1),
+ .lang_count = cpu_to_le32(1),
+ },
+ .lang0 = {
+ cpu_to_le16(0x0409), /* en-us */
+ STR_INTERFACE_,
+ },
+};
+
+
+struct usb2_hub_desc_header {
+ __u8 bDescLength;
+ __u8 bDescriptorType;
+ __u8 bNbrPorts;
+ __le16 wHubCharacteristics;
+ __u8 bPwrOn2PwrGood;
+ __u8 bHubContrCurrent;
+ __u8 data[0];
+};
+
+#define NUM_PORTS 31
+#define HDESC_ARR_BYTES ((NUM_PORTS + 1 + 7) / 8)
+static const struct {
+ struct usb2_hub_desc_header hdr;
+ uint8_t DeviceRemovable[HDESC_ARR_BYTES];
+ uint8_t PortPwrCtrlMask[HDESC_ARR_BYTES];
+} __attribute__ ((packed)) hub_desc = {
+ .hdr = {
+ .bDescLength = sizeof(hub_desc),
+ .bDescriptorType = USB_DT_HUB,
+ .bNbrPorts = NUM_PORTS,
+ .wHubCharacteristics = cpu_to_le16(0x0001),
+ .bPwrOn2PwrGood = 100,
+ .bHubContrCurrent = 0,
+ },
+};
+
+
+/***********************************************************************
+ * USB FunctionFS interface
+ ***********************************************************************/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <assert.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <osmocom/core/select.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/utils.h>
+#include <osmocom/core/application.h>
+#include <osmocom/core/logging.h>
+
+#ifndef FUNCTIONFS_SUPPORTS_POLL
+#include <libaio.h>
+struct aio_help {
+ struct msgb *msg;
+ struct iocb *iocb;
+};
+#endif
+
+/* usb function handle */
+struct ufunc_handle {
+ struct osmo_fd ep0;
+ struct osmo_fd ep_int;
+ struct llist_head ep_int_queue;
+#ifndef FUNCTIONFS_SUPPORTS_POLL
+ struct osmo_fd aio_evfd;
+ io_context_t aio_ctx;
+ struct aio_help aio_int;
+#endif
+};
+
+static int ep_int_cb(struct osmo_fd *ofd, unsigned int what)
+{
+ LOGP(DUSB, LOGL_DEBUG, "%s\n", __func__);
+ return 0;
+}
+
+const struct value_string ffs_evt_type_names[] = {
+ { FUNCTIONFS_BIND, "BIND" },
+ { FUNCTIONFS_UNBIND, "UNBIND" },
+ { FUNCTIONFS_ENABLE, "ENABLE" },
+ { FUNCTIONFS_DISABLE, "DISABLE" },
+ { FUNCTIONFS_SETUP, "SETUP" },
+ { FUNCTIONFS_SUSPEND, "SUSPEND" },
+ { FUNCTIONFS_RESUME, "RESUME" },
+ { 0, NULL }
+};
+
+/* local, stand-alone definition of a USB control request */
+struct _usb_ctrl_req {
+ uint8_t bRequestType;
+ uint8_t bRequest;
+ uint16_t wValue;
+ uint16_t wIndex;
+ uint16_t wLength;
+} __attribute__ ((packed));;
+
+/* class requests from the USB 2.0 hub spec, table 11-15 */
+#define HUB_CLASS_REQ(dir, type, request) ((((dir) | (type)) << 8) | (request))
+/* GetBusState and SetHubDescriptor are optional, omitted */
+#define ClearHubFeature HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_HUB, USB_REQ_CLEAR_FEATURE)
+#define ClearPortFeature HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_PORT, USB_REQ_CLEAR_FEATURE)
+#define GetHubDescriptor HUB_CLASS_REQ(USB_DIR_IN, USB_RT_HUB, USB_REQ_GET_DESCRIPTOR)
+#define GetHubStatus HUB_CLASS_REQ(USB_DIR_IN, USB_RT_HUB, USB_REQ_GET_STATUS)
+#define GetPortStatus HUB_CLASS_REQ(USB_DIR_IN, USB_RT_PORT, USB_REQ_GET_STATUS)
+#define SetHubFeature HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_HUB, USB_REQ_SET_FEATURE)
+#define SetPortFeature HUB_CLASS_REQ(USB_DIR_OUT, USB_RT_PORT, USB_REQ_SET_FEATURE)
+
+static const struct value_string hub_class_spec_req_vals[] = {
+ OSMO_VALUE_STRING(USB_REQ_CLEAR_FEATURE),
+ OSMO_VALUE_STRING(USB_REQ_GET_DESCRIPTOR),
+ OSMO_VALUE_STRING(USB_REQ_GET_STATUS),
+ OSMO_VALUE_STRING(USB_REQ_SET_FEATURE),
+ { 0, NULL }
+};
+
+#define CCID_CTRL_RET_INVALID -1
+#define CCID_CTRL_RET_UNKNOWN -2
+#define CCID_CTRL_RET_OK 0
+
+/*! Handle [class specific] CTRL request. We assume the caller has already verified that the
+ * request was made to the correct interface as well as it is a class-specific request.
+ * \param[in] ci CCID Instance for which CTRL request was received
+ * \param[in] ctrl_req buffer holding the 8 bytes CTRL transfer header
+ * \param[out] data_in data to be returned to the host in the IN transaction (if any)
+ * \returns CCID_CTRL_RET_OK, CCID_CTRL_RET_INVALID or CCID_CTRL_RET_UNKNOWN
+ */
+int hub_handle_ctrl(void *ci, const uint8_t *ctrl_req, const uint8_t **data_in)
+{
+ const struct _usb_ctrl_req *req = (const struct _usb_ctrl_req *) ctrl_req;
+ static uint16_t status[2];
+ int rc;
+
+ LOGP(DUSB, LOGL_NOTICE, "CTRL bmReqT=0x%02X bRequest=%s, wValue=0x%04X, wIndex=0x%04X, wLength=%d\n",
+ req->bRequestType, get_value_string(hub_class_spec_req_vals, req->bRequest),
+ req->wValue, req->wIndex, req->wLength);
+
+ switch (req->bRequestType & 0x7f) {
+ case USB_RT_HUB:
+ switch (req->bRequest) {
+ case USB_REQ_GET_DESCRIPTOR:
+ if (req->wIndex != 0) {
+ LOGP(DUSB, LOGL_ERROR, "GET_DESC wIndex invalid\n");
+ return CCID_CTRL_RET_INVALID;
+ }
+ if (0) // ctrl_req->wValue != FIXME
+ return CCID_CTRL_RET_INVALID;
+ *data_in = (const uint8_t *) &hub_desc;
+ return sizeof(hub_desc);
+ case USB_REQ_CLEAR_FEATURE:
+ switch (req->wValue) {
+ case C_HUB_LOCAL_POWER:
+ case C_HUB_OVER_CURRENT:
+ return CCID_CTRL_RET_OK;
+ }
+ break;
+ case USB_REQ_GET_STATUS:
+ status[0] = cpu_to_le16(HUB_STATUS_LOCAL_POWER);
+ status[1] = cpu_to_le16(0);
+ *data_in = (const uint8_t *) status;
+ return sizeof(status);
+ case USB_REQ_SET_FEATURE:
+ if (req->wValue > 1)
+ return CCID_CTRL_RET_INVALID;
+ return CCID_CTRL_RET_OK;
+ }
+ break;
+ case USB_RT_PORT:
+ switch (req->bRequest) {
+ case USB_REQ_CLEAR_FEATURE:
+ switch (req->wValue) {
+ case USB_PORT_FEAT_CONNECTION:
+ case USB_PORT_FEAT_ENABLE:
+ case USB_PORT_FEAT_SUSPEND:
+ case USB_PORT_FEAT_OVER_CURRENT:
+ case USB_PORT_FEAT_RESET:
+ case USB_PORT_FEAT_L1:
+ case USB_PORT_FEAT_POWER:
+ case USB_PORT_FEAT_LOWSPEED:
+ case USB_PORT_FEAT_C_CONNECTION:
+ case USB_PORT_FEAT_C_ENABLE:
+ case USB_PORT_FEAT_C_SUSPEND:
+ case USB_PORT_FEAT_C_OVER_CURRENT:
+ case USB_PORT_FEAT_C_RESET:
+ case USB_PORT_FEAT_TEST:
+ case USB_PORT_FEAT_C_PORT_L1:
+ return CCID_CTRL_RET_OK;
+ }
+ break;
+ case USB_REQ_GET_STATUS:
+ status[0] = cpu_to_le16(0);
+ status[1] = cpu_to_le16(0);
+ *data_in = (const uint8_t *) status;
+ return sizeof(status);
+ case USB_REQ_SET_FEATURE:
+ //selector = wIndex >> 8
+ //port = wIndex & 0xff
+ return CCID_CTRL_RET_OK;
+ }
+ }
+ return CCID_CTRL_RET_UNKNOWN;
+}
+
+static void handle_setup(int fd, const struct usb_ctrlrequest *setup)
+{
+ const uint8_t *data_in = NULL;
+ int rc;
+
+ LOGP(DUSB, LOGL_NOTICE, "EP0 SETUP bRequestType=0x%02x, bRequest=0x%02x wValue=0x%04x, "
+ "wIndex=0x%04x, wLength=%u\n", setup->bRequestType, setup->bRequest,
+ le16_to_cpu(setup->wValue), le16_to_cpu(setup->wIndex), le16_to_cpu(setup->wLength));
+
+ rc = hub_handle_ctrl(NULL, (const uint8_t *) setup, &data_in);
+ switch (rc) {
+ case CCID_CTRL_RET_INVALID:
+ if (setup->bRequestType & USB_DIR_IN)
+ read(fd, NULL, 0); /* cause stall */
+ else
+ write(fd, NULL, 0); /* cause stall */
+ break;
+ case CCID_CTRL_RET_UNKNOWN:
+ /* FIXME: is this correct behavior? */
+ if (setup->bRequestType & USB_DIR_IN)
+ write(fd, NULL, 0); /* send ZLP */
+ else
+ read(fd, NULL, 0);
+ break;
+ default:
+ if (setup->bRequestType & USB_DIR_IN) {
+ uint16_t len = rc;
+ if (setup->wLength < len)
+ len = setup->wLength;
+ LOGP(DUSB, LOGL_NOTICE, "Writing %u: %s\n", len, osmo_hexdump_nospc(data_in, len));
+ write(fd, data_in, le16_to_cpu(len));
+ } else
+ read(fd, NULL, 0); /* FIXME: control OUT? */
+ break;
+ }
+}
+
+static int ep_0_cb(struct osmo_fd *ofd, unsigned int what)
+{
+ struct ufunc_handle *uh = (struct ufunc_handle *) ofd->data;
+ int rc;
+
+ if (what & BSC_FD_READ) {
+ struct usb_functionfs_event evt;
+ rc = read(ofd->fd, (uint8_t *)&evt, sizeof(evt));
+ if (rc < sizeof(evt))
+ return -23;
+ LOGP(DUSB, LOGL_NOTICE, "EP0 %s\n", get_value_string(ffs_evt_type_names, evt.type));
+ switch (evt.type) {
+ case FUNCTIONFS_ENABLE:
+ //aio_refill_out(uh);
+ break;
+ case FUNCTIONFS_SETUP:
+ handle_setup(ofd->fd, &evt.u.setup);
+ break;
+ }
+
+ }
+ return 0;
+}
+
+#ifndef FUNCTIONFS_SUPPORTS_POLL
+
+/* dequeue the next msgb from ep_int_queue and set up AIO for it */
+static void dequeue_aio_write_int(struct ufunc_handle *uh)
+{
+ struct aio_help *ah = &uh->aio_int;
+ struct msgb *d;
+ int rc;
+
+ if (ah->msg)
+ return;
+
+ d = msgb_dequeue(&uh->ep_int_queue);
+ if (!d)
+ return;
+
+ OSMO_ASSERT(ah->iocb);
+ ah->msg = d;
+ io_prep_pwrite(ah->iocb, uh->ep_int.fd, msgb_data(d), msgb_length(d), 0);
+ io_set_eventfd(ah->iocb, uh->aio_evfd.fd);
+ rc = io_submit(uh->aio_ctx, 1, &ah->iocb);
+ OSMO_ASSERT(rc >= 0);
+}
+
+static int evfd_cb(struct osmo_fd *ofd, unsigned int what)
+{
+ struct ufunc_handle *uh = (struct ufunc_handle *) ofd->data;
+ struct io_event evt[1];
+ struct msgb *msg;
+ uint64_t ev_cnt;
+ int i, rc;
+
+ rc = read(ofd->fd, &ev_cnt, sizeof(ev_cnt));
+ assert(rc == sizeof(ev_cnt));
+
+ rc = io_getevents(uh->aio_ctx, 1, 1, evt, NULL);
+ if (rc <= 0) {
+ LOGP(DUSB, LOGL_ERROR, "error in io_getevents(): %d\n", rc);
+ return rc;
+ }
+
+ for (i = 0; i < rc; i++) {
+ int fd = evt[i].obj->aio_fildes;
+ if (fd == uh->ep_int.fd) {
+ /* interrupt endpoint AIO has completed. This means the IRQ transfer
+ * which we generated has reached the host */
+ LOGP(DUSB, LOGL_DEBUG, "IRQ AIO completed, free()ing msgb\n");
+ msgb_free(uh->aio_int.msg);
+ uh->aio_int.msg = NULL;
+ dequeue_aio_write_int(uh);
+ }
+ }
+ return 0;
+}
+#endif
+
+
+static int ep0_init(struct ufunc_handle *uh)
+{
+ int rc;
+
+ /* open control endpoint and write descriptors to it */
+ rc = open("ep0", O_RDWR);
+ assert(rc >= 0);
+ osmo_fd_setup(&uh->ep0, rc, BSC_FD_READ, &ep_0_cb, uh, 0);
+ osmo_fd_register(&uh->ep0);
+ rc = write(uh->ep0.fd, &descriptors, sizeof(descriptors));
+ if (rc != sizeof(descriptors)) {
+ LOGP(DUSB, LOGL_ERROR, "Cannot write descriptors: %s\n", strerror(errno));
+ return -1;
+ }
+ rc = write(uh->ep0.fd, &strings, sizeof(strings));
+ if (rc != sizeof(strings)) {
+ LOGP(DUSB, LOGL_ERROR, "Cannot write strings: %s\n", strerror(errno));
+ return -1;
+ }
+
+ /* open other endpoint file descriptors */
+ INIT_LLIST_HEAD(&uh->ep_int_queue);
+ rc = open("ep1", O_RDWR);
+ assert(rc >= 0);
+ osmo_fd_setup(&uh->ep_int, rc, 0, &ep_int_cb, uh, 1);
+#ifdef FUNCTIONFS_SUPPORTS_POLL
+ osmo_fd_register(&uh->ep_int);
+#endif
+
+#ifndef FUNCTIONFS_SUPPORTS_POLL
+#include <sys/eventfd.h>
+ /* for some absolutely weird reason, gadgetfs+functionfs don't support
+ * the standard methods of non-blocking I/o (select/poll). We need to
+ * work around using Linux AIO, which is not to be confused with POSIX AIO! */
+
+ memset(&uh->aio_ctx, 0, sizeof(uh->aio_ctx));
+ rc = io_setup(1, &uh->aio_ctx);
+ OSMO_ASSERT(rc >= 0);
+
+ /* create an eventfd, which will be marked readable once some AIO completes */
+ rc = eventfd(0, 0);
+ OSMO_ASSERT(rc >= 0);
+ osmo_fd_setup(&uh->aio_evfd, rc, BSC_FD_READ, &evfd_cb, uh, 0);
+ osmo_fd_register(&uh->aio_evfd);
+
+ uh->aio_int.iocb = malloc(sizeof(struct iocb));
+#endif
+
+ return 0;
+}
+
+static const struct log_info_cat log_info_cat[] = {
+ [DUSB] = {
+ .name = "USB",
+ .description = "USB Transport",
+ .enabled = 1,
+ .loglevel = LOGL_NOTICE,
+ },
+};
+
+static const struct log_info log_info = {
+ .cat = log_info_cat,
+ .num_cat = ARRAY_SIZE(log_info_cat),
+};
+
+static void *tall_main_ctx;
+
+static void signal_handler(int signal)
+{
+ switch (signal) {
+ case SIGUSR1:
+ talloc_report_full(tall_main_ctx, stderr);
+ break;
+ }
+}
+
+
+int main(int argc, char **argv)
+{
+ struct ufunc_handle ufh = (struct ufunc_handle) { 0, };
+ int rc;
+
+ tall_main_ctx = talloc_named_const(NULL, 0, "hub_main_functionfs");
+ msgb_talloc_ctx_init(tall_main_ctx, 0);
+ osmo_init_logging2(tall_main_ctx, &log_info);
+
+ signal(SIGUSR1, &signal_handler);
+
+ if (argc < 2) {
+ fprintf(stderr, "You have to specify the mount-path of the functionfs\n");
+ exit(2);
+ }
+
+ chdir(argv[1]);
+ rc = ep0_init(&ufh);
+ if (rc < 0) {
+ fprintf(stderr, "Error %d\n", rc);
+ exit(1);
+ }
+
+ while (1) {
+ osmo_select_main(0);
+ }
+}
diff --git a/ccid/hub_remove_gadget.sh b/ccid/hub_remove_gadget.sh
new file mode 100755
index 0000000..e206d6f
--- /dev/null
+++ b/ccid/hub_remove_gadget.sh
@@ -0,0 +1,33 @@
+#!/bin/bash
+
+GADGET_NAME=osmo-hub
+
+GADGET_CONFIGFS=/sys/kernel/config/usb_gadget
+
+set -e
+set -x
+
+gadgetdir="$GADGET_CONFIGFS/$GADGET_NAME"
+
+# unmount the endpoints from the filesystem
+umount /dev/ffs-hub
+
+# detach from USB gadget/bus
+echo "" > "$gadgetdir/UDC" || true
+
+# remove function from config
+rm "$gadgetdir/configs/c.1/ffs.usb0"
+
+# remove strings in config
+rmdir "$gadgetdir/configs/c.1/strings/0x409"
+
+# remove config
+rmdir "$gadgetdir/configs/c.1"
+
+# remove function
+rmdir "$gadgetdir/functions/ffs.usb0"
+
+# remove strings in gadget
+rmdir "$gadgetdir/strings/0x409"
+
+rmdir $gadgetdir
--
To view, visit https://gerrit.osmocom.org/c/osmo-ccid-firmware/+/15499
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Gerrit-Project: osmo-ccid-firmware
Gerrit-Branch: master
Gerrit-Change-Id: Ic3d2bec3f55f4d9e13183795c5825723f9427476
Gerrit-Change-Number: 15499
Gerrit-PatchSet: 1
Gerrit-Owner: laforge <laforge at gnumonks.org>
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