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usb.c
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usb.c
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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
* libiio - Library for interfacing industrial I/O (IIO) devices
*
* Copyright (C) 2015 - 2020 Analog Devices, Inc.
* Author: Paul Cercueil <[email protected]>
*/
#include "iio-lock.h"
#include "iio-private.h"
#include "iiod-client.h"
#include <ctype.h>
#ifdef __linux__
#include <dirent.h>
#endif
#include <errno.h>
#include <libusb.h>
#include <stdbool.h>
#include <string.h>
#include "debug.h"
#define DEFAULT_TIMEOUT_MS 5000
/* Endpoint for non-streaming operations */
#define EP_OPS 1
#define IIO_INTERFACE_NAME "IIO"
struct iio_usb_ep_couple {
unsigned char addr_in, addr_out;
uint16_t pipe_id;
bool in_use;
struct iio_mutex *lock;
};
struct iiod_client_pdata {
struct iio_usb_ep_couple *ep;
struct iio_mutex *lock;
bool cancelled;
struct libusb_transfer *transfer;
};
struct iio_context_pdata {
libusb_context *ctx;
libusb_device_handle *hdl;
uint16_t intrfc;
struct iiod_client *iiod_client;
/* Lock for endpoint reservation */
struct iio_mutex *ep_lock;
struct iio_usb_ep_couple *io_endpoints;
uint16_t nb_ep_couples;
unsigned int timeout_ms;
struct iiod_client_pdata io_ctx;
};
struct iio_device_pdata {
struct iio_mutex *lock;
bool opened;
struct iiod_client_pdata io_ctx;
};
static const unsigned int libusb_to_errno_codes[] = {
[- LIBUSB_ERROR_INVALID_PARAM] = EINVAL,
[- LIBUSB_ERROR_ACCESS] = EACCES,
[- LIBUSB_ERROR_NO_DEVICE] = ENODEV,
[- LIBUSB_ERROR_NOT_FOUND] = ENXIO,
[- LIBUSB_ERROR_BUSY] = EBUSY,
[- LIBUSB_ERROR_TIMEOUT] = ETIMEDOUT,
[- LIBUSB_ERROR_OVERFLOW] = EIO,
[- LIBUSB_ERROR_PIPE] = EPIPE,
[- LIBUSB_ERROR_INTERRUPTED] = EINTR,
[- LIBUSB_ERROR_NO_MEM] = ENOMEM,
[- LIBUSB_ERROR_NOT_SUPPORTED] = ENOSYS,
};
static unsigned int libusb_to_errno(int error)
{
switch ((enum libusb_error) error) {
case LIBUSB_ERROR_INVALID_PARAM:
case LIBUSB_ERROR_ACCESS:
case LIBUSB_ERROR_NO_DEVICE:
case LIBUSB_ERROR_NOT_FOUND:
case LIBUSB_ERROR_BUSY:
case LIBUSB_ERROR_TIMEOUT:
case LIBUSB_ERROR_PIPE:
case LIBUSB_ERROR_INTERRUPTED:
case LIBUSB_ERROR_NO_MEM:
case LIBUSB_ERROR_NOT_SUPPORTED:
return libusb_to_errno_codes[- (int) error];
case LIBUSB_ERROR_IO:
case LIBUSB_ERROR_OTHER:
case LIBUSB_ERROR_OVERFLOW:
default:
return EIO;
}
}
static int usb_io_context_init(struct iiod_client_pdata *io_ctx)
{
io_ctx->lock = iio_mutex_create();
if (!io_ctx->lock)
return -ENOMEM;
return 0;
}
static void usb_io_context_exit(struct iiod_client_pdata *io_ctx)
{
if (io_ctx->lock) {
iio_mutex_destroy(io_ctx->lock);
io_ctx->lock = NULL;
}
}
static int usb_get_version(const struct iio_context *ctx,
unsigned int *major, unsigned int *minor, char git_tag[8])
{
struct iio_context_pdata *pdata = iio_context_get_pdata(ctx);
return iiod_client_get_version(pdata->iiod_client,
&pdata->io_ctx, major, minor, git_tag);
}
static unsigned int usb_calculate_remote_timeout(unsigned int timeout)
{
/* XXX(pcercuei): We currently hardcode timeout / 2 for the backend used
* by the remote. Is there something better to do here? */
return timeout / 2;
}
#define USB_PIPE_CTRL_TIMEOUT 1000 /* These should not take long */
#define IIO_USD_CMD_RESET_PIPES 0
#define IIO_USD_CMD_OPEN_PIPE 1
#define IIO_USD_CMD_CLOSE_PIPE 2
static int usb_reset_pipes(struct iio_context_pdata *pdata)
{
int ret;
/*
int libusb_control_transfer(libusb_device_handle *devh,
uint8_t bmRequestType,
uint8_t bRequest,
uint16_t wValue,
uint16_t wIndex,
unsigned char *data,
uint16_t wLength,
unsigned int timeout)
*/
ret = libusb_control_transfer(pdata->hdl,
LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_INTERFACE,
IIO_USD_CMD_RESET_PIPES,
0,
pdata->intrfc,
NULL,
0,
USB_PIPE_CTRL_TIMEOUT);
if (ret < 0)
return -(int) libusb_to_errno(ret);
return 0;
}
static int usb_open_pipe(struct iio_context_pdata *pdata, uint16_t pipe_id)
{
int ret;
/*
libusb_device_handle *devh,
uint8_t bmRequestType,
uint8_t bRequest,
uint16_t wValue,
uint16_t wIndex,
unsigned char *data,
uint16_t wLength,
unsigned int timeout)
*/
ret = libusb_control_transfer(
pdata->hdl,
LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_INTERFACE,
IIO_USD_CMD_OPEN_PIPE,
pipe_id,
pdata->intrfc,
NULL,
0,
USB_PIPE_CTRL_TIMEOUT);
if (ret < 0)
return -(int) libusb_to_errno(ret);
return 0;
}
static int usb_close_pipe(struct iio_context_pdata *pdata, uint16_t pipe_id)
{
int ret;
ret = libusb_control_transfer(pdata->hdl, LIBUSB_REQUEST_TYPE_VENDOR |
LIBUSB_RECIPIENT_INTERFACE, IIO_USD_CMD_CLOSE_PIPE,
pipe_id, pdata->intrfc, NULL, 0, USB_PIPE_CTRL_TIMEOUT);
if (ret < 0)
return -(int) libusb_to_errno(ret);
return 0;
}
static int usb_reserve_ep_unlocked(const struct iio_device *dev)
{
struct iio_context_pdata *pdata = iio_context_get_pdata(dev->ctx);
unsigned int i;
for (i = 0; i < pdata->nb_ep_couples; i++) {
struct iio_usb_ep_couple *ep = &pdata->io_endpoints[i];
if (!ep->in_use) {
ep->in_use = true;
dev->pdata->io_ctx.ep = ep;
dev->pdata->lock = ep->lock;
return 0;
}
}
return -EBUSY;
}
static void usb_free_ep_unlocked(const struct iio_device *dev)
{
struct iio_context_pdata *pdata = iio_context_get_pdata(dev->ctx);
unsigned int i;
for (i = 0; i < pdata->nb_ep_couples; i++) {
struct iio_usb_ep_couple *ep = &pdata->io_endpoints[i];
if (ep->lock == dev->pdata->lock) {
ep->in_use = false;
return;
}
}
}
static int usb_open(const struct iio_device *dev,
size_t samples_count, bool cyclic)
{
struct iio_context_pdata *ctx_pdata = iio_context_get_pdata(dev->ctx);
struct iio_device_pdata *pdata = dev->pdata;
int ret = -EBUSY;
iio_mutex_lock(ctx_pdata->ep_lock);
pdata->io_ctx.cancelled = false;
if (pdata->opened)
goto out_unlock;
ret = usb_reserve_ep_unlocked(dev);
if (ret)
goto out_unlock;
ret = usb_open_pipe(ctx_pdata, pdata->io_ctx.ep->pipe_id);
if (ret) {
char err_str[1024];
iio_strerror(-ret, err_str, sizeof(err_str));
IIO_ERROR("Failed to open pipe: %s\n", err_str);
usb_free_ep_unlocked(dev);
goto out_unlock;
}
iio_mutex_lock(pdata->lock);
ret = iiod_client_open_unlocked(ctx_pdata->iiod_client, &pdata->io_ctx,
dev, samples_count, cyclic);
if (!ret) {
unsigned int remote_timeout =
usb_calculate_remote_timeout(ctx_pdata->timeout_ms);
ret = iiod_client_set_timeout(ctx_pdata->iiod_client,
&pdata->io_ctx, remote_timeout);
}
pdata->opened = !ret;
iio_mutex_unlock(pdata->lock);
if (ret) {
usb_close_pipe(ctx_pdata, pdata->io_ctx.ep->pipe_id);
usb_free_ep_unlocked(dev);
}
out_unlock:
iio_mutex_unlock(ctx_pdata->ep_lock);
return ret;
}
static int usb_close(const struct iio_device *dev)
{
struct iio_context_pdata *ctx_pdata = iio_context_get_pdata(dev->ctx);
struct iio_device_pdata *pdata = dev->pdata;
int ret = -EBADF;
iio_mutex_lock(ctx_pdata->ep_lock);
if (!pdata->opened)
goto out_unlock;
iio_mutex_lock(pdata->lock);
ret = iiod_client_close_unlocked(ctx_pdata->iiod_client, &pdata->io_ctx,
dev);
pdata->opened = false;
iio_mutex_unlock(pdata->lock);
usb_close_pipe(ctx_pdata, pdata->io_ctx.ep->pipe_id);
usb_free_ep_unlocked(dev);
out_unlock:
iio_mutex_unlock(ctx_pdata->ep_lock);
return ret;
}
static ssize_t usb_read(const struct iio_device *dev, void *dst, size_t len,
uint32_t *mask, size_t words)
{
struct iio_context_pdata *ctx_pdata = iio_context_get_pdata(dev->ctx);
struct iio_device_pdata *pdata = dev->pdata;
ssize_t ret;
iio_mutex_lock(pdata->lock);
ret = iiod_client_read_unlocked(ctx_pdata->iiod_client,
&pdata->io_ctx, dev, dst, len, mask, words);
iio_mutex_unlock(pdata->lock);
return ret;
}
static ssize_t usb_write(const struct iio_device *dev,
const void *src, size_t len)
{
struct iio_context_pdata *ctx_pdata = iio_context_get_pdata(dev->ctx);
struct iio_device_pdata *pdata = dev->pdata;
ssize_t ret;
iio_mutex_lock(pdata->lock);
ret = iiod_client_write_unlocked(ctx_pdata->iiod_client,
&pdata->io_ctx, dev, src, len);
iio_mutex_unlock(pdata->lock);
return ret;
}
static ssize_t usb_read_dev_attr(const struct iio_device *dev,
const char *attr, char *dst, size_t len, enum iio_attr_type type)
{
struct iio_context_pdata *pdata = iio_context_get_pdata(dev->ctx);
return iiod_client_read_attr(pdata->iiod_client,
&pdata->io_ctx, dev, NULL, attr,
dst, len, type);
}
static ssize_t usb_write_dev_attr(const struct iio_device *dev,
const char *attr, const char *src, size_t len, enum iio_attr_type type)
{
struct iio_context_pdata *pdata = iio_context_get_pdata(dev->ctx);
return iiod_client_write_attr(pdata->iiod_client,
&pdata->io_ctx, dev, NULL, attr,
src, len, type);
}
static ssize_t usb_read_chn_attr(const struct iio_channel *chn,
const char *attr, char *dst, size_t len)
{
struct iio_context_pdata *pdata = iio_context_get_pdata(chn->dev->ctx);
return iiod_client_read_attr(pdata->iiod_client,
&pdata->io_ctx, chn->dev, chn, attr,
dst, len, false);
}
static ssize_t usb_write_chn_attr(const struct iio_channel *chn,
const char *attr, const char *src, size_t len)
{
struct iio_context_pdata *pdata = iio_context_get_pdata(chn->dev->ctx);
return iiod_client_write_attr(pdata->iiod_client,
&pdata->io_ctx, chn->dev, chn, attr,
src, len, false);
}
static int usb_set_kernel_buffers_count(const struct iio_device *dev,
unsigned int nb_blocks)
{
struct iio_context_pdata *pdata = iio_context_get_pdata(dev->ctx);
return iiod_client_set_kernel_buffers_count(pdata->iiod_client,
&pdata->io_ctx, dev, nb_blocks);
}
static int usb_set_timeout(struct iio_context *ctx, unsigned int timeout)
{
struct iio_context_pdata *pdata = iio_context_get_pdata(ctx);
unsigned int remote_timeout = usb_calculate_remote_timeout(timeout);
int ret;
ret = iiod_client_set_timeout(pdata->iiod_client,
&pdata->io_ctx, remote_timeout);
if (!ret)
pdata->timeout_ms = timeout;
return ret;
}
static int usb_get_trigger(const struct iio_device *dev,
const struct iio_device **trigger)
{
struct iio_context_pdata *pdata = iio_context_get_pdata(dev->ctx);
return iiod_client_get_trigger(pdata->iiod_client,
&pdata->io_ctx, dev, trigger);
}
static int usb_set_trigger(const struct iio_device *dev,
const struct iio_device *trigger)
{
struct iio_context_pdata *pdata = iio_context_get_pdata(dev->ctx);
return iiod_client_set_trigger(pdata->iiod_client,
&pdata->io_ctx, dev, trigger);
}
static void usb_shutdown(struct iio_context *ctx)
{
struct iio_context_pdata *pdata = iio_context_get_pdata(ctx);
unsigned int nb_devices = iio_context_get_devices_count(ctx);
unsigned int i;
usb_io_context_exit(&pdata->io_ctx);
for (i = 0; i < nb_devices; i++)
usb_close(iio_context_get_device(ctx, i));
iio_mutex_destroy(pdata->ep_lock);
for (i = 0; i < pdata->nb_ep_couples; i++)
if (pdata->io_endpoints[i].lock)
iio_mutex_destroy(pdata->io_endpoints[i].lock);
free(pdata->io_endpoints);
for (i = 0; i < nb_devices; i++) {
struct iio_device *dev = iio_context_get_device(ctx, i);
usb_io_context_exit(&dev->pdata->io_ctx);
free(dev->pdata);
}
iiod_client_destroy(pdata->iiod_client);
usb_reset_pipes(pdata); /* Close everything */
libusb_close(pdata->hdl);
libusb_exit(pdata->ctx);
}
static int iio_usb_match_interface(const struct libusb_config_descriptor *desc,
struct libusb_device_handle *hdl, unsigned int intrfc)
{
const struct libusb_interface *iface;
unsigned int i;
if (intrfc >= desc->bNumInterfaces)
return -EINVAL;
iface = &desc->interface[intrfc];
for (i = 0; i < (unsigned int) iface->num_altsetting; i++) {
const struct libusb_interface_descriptor *idesc =
&iface->altsetting[i];
char name[64];
int ret;
if (idesc->iInterface == 0)
continue;
ret = libusb_get_string_descriptor_ascii(hdl, idesc->iInterface,
(unsigned char *) name, sizeof(name));
if (ret < 0)
return -(int) libusb_to_errno(ret);
if (!strcmp(name, IIO_INTERFACE_NAME))
return (int) i;
}
return -EPERM;
}
static int iio_usb_match_device(struct libusb_device *dev,
struct libusb_device_handle *hdl,
unsigned int *intrfc)
{
struct libusb_config_descriptor *desc;
unsigned int i;
int ret;
ret = libusb_get_active_config_descriptor(dev, &desc);
if (ret)
return -(int) libusb_to_errno(ret);
for (i = 0, ret = -EPERM; ret == -EPERM &&
i < desc->bNumInterfaces; i++)
ret = iio_usb_match_interface(desc, hdl, i);
libusb_free_config_descriptor(desc);
if (ret < 0)
return ret;
IIO_DEBUG("Found IIO interface on device %u:%u using interface %u\n",
libusb_get_bus_number(dev),
libusb_get_device_address(dev), i - 1);
*intrfc = i - 1;
return ret;
}
static void usb_cancel(const struct iio_device *dev)
{
struct iio_device_pdata *ppdata = dev->pdata;
iio_mutex_lock(ppdata->io_ctx.lock);
if (ppdata->io_ctx.transfer && !ppdata->io_ctx.cancelled)
libusb_cancel_transfer(ppdata->io_ctx.transfer);
ppdata->io_ctx.cancelled = true;
iio_mutex_unlock(ppdata->io_ctx.lock);
}
static const struct iio_backend_ops usb_ops = {
.get_version = usb_get_version,
.open = usb_open,
.close = usb_close,
.read = usb_read,
.write = usb_write,
.read_device_attr = usb_read_dev_attr,
.read_channel_attr = usb_read_chn_attr,
.write_device_attr = usb_write_dev_attr,
.write_channel_attr = usb_write_chn_attr,
.get_trigger = usb_get_trigger,
.set_trigger = usb_set_trigger,
.set_kernel_buffers_count = usb_set_kernel_buffers_count,
.set_timeout = usb_set_timeout,
.shutdown = usb_shutdown,
.cancel = usb_cancel,
};
static void LIBUSB_CALL sync_transfer_cb(struct libusb_transfer *transfer)
{
int *completed = transfer->user_data;
*completed = 1;
}
static int usb_sync_transfer(struct iio_context_pdata *pdata,
struct iiod_client_pdata *io_ctx, unsigned int ep_type,
char *data, size_t len, int *transferred)
{
unsigned char ep;
struct libusb_transfer *transfer = NULL;
int completed = 0;
int ret;
/*
* If the size of the data to transfer is too big, the
* IOCTL_USBFS_SUBMITURB ioctl (called by libusb) might fail with
* errno set to ENOMEM, as the kernel might use contiguous allocation
* for the URB if the driver doesn't support scatter-gather.
* To prevent that, we support URBs of 1 MiB maximum. The iiod-client
* code will handle this properly and ask for a new transfer.
*/
if (len > 1 * 1024 * 1024)
len = 1 * 1024 * 1024;
if (ep_type == LIBUSB_ENDPOINT_IN)
ep = io_ctx->ep->addr_in;
else
ep = io_ctx->ep->addr_out;
/*
* For cancellation support the check whether the buffer has already been
* cancelled and the allocation as well as the assignment of the new
* transfer needs to happen in one atomic step. Otherwise it is possible
* that the cancellation is missed and transfer is not aborted.
*/
iio_mutex_lock(io_ctx->lock);
if (io_ctx->cancelled) {
ret = -EBADF;
goto unlock;
}
transfer = libusb_alloc_transfer(0);
if (!transfer) {
ret = -ENOMEM;
goto unlock;
}
transfer->user_data = &completed;
libusb_fill_bulk_transfer(transfer, pdata->hdl, ep,
(unsigned char *) data, (int) len, sync_transfer_cb,
&completed, pdata->timeout_ms);
transfer->type = LIBUSB_TRANSFER_TYPE_BULK;
ret = libusb_submit_transfer(transfer);
if (ret) {
ret = -(int) libusb_to_errno(ret);
libusb_free_transfer(transfer);
goto unlock;
}
io_ctx->transfer = transfer;
unlock:
iio_mutex_unlock(io_ctx->lock);
if (ret)
return ret;
while (!completed) {
ret = libusb_handle_events_completed(pdata->ctx, &completed);
if (ret < 0) {
if (ret == LIBUSB_ERROR_INTERRUPTED)
continue;
libusb_cancel_transfer(transfer);
continue;
}
}
switch (transfer->status) {
case LIBUSB_TRANSFER_COMPLETED:
*transferred = transfer->actual_length;
ret = 0;
break;
case LIBUSB_TRANSFER_TIMED_OUT:
ret = -ETIMEDOUT;
break;
case LIBUSB_TRANSFER_STALL:
ret = -EPIPE;
break;
case LIBUSB_TRANSFER_NO_DEVICE:
ret = -ENODEV;
break;
case LIBUSB_TRANSFER_CANCELLED:
ret = -EBADF;
break;
default:
ret = -EIO;
break;
}
/* Same as above. This needs to be atomic in regards to usb_cancel(). */
iio_mutex_lock(io_ctx->lock);
io_ctx->transfer = NULL;
iio_mutex_unlock(io_ctx->lock);
libusb_free_transfer(transfer);
return ret;
}
static ssize_t write_data_sync(struct iio_context_pdata *pdata,
struct iiod_client_pdata *ep,
const char *data, size_t len)
{
int transferred, ret;
ret = usb_sync_transfer(pdata, ep, LIBUSB_ENDPOINT_OUT, (char *) data,
len, &transferred);
if (ret)
return ret;
else
return (ssize_t) transferred;
}
static ssize_t read_data_sync(struct iio_context_pdata *pdata,
struct iiod_client_pdata *ep,
char *buf, size_t len)
{
int transferred, ret;
ret = usb_sync_transfer(pdata, ep, LIBUSB_ENDPOINT_IN, buf, len,
&transferred);
if (ret)
return ret;
else
return transferred;
}
static const struct iiod_client_ops usb_iiod_client_ops = {
.write = write_data_sync,
.read = read_data_sync,
.read_line = read_data_sync,
};
static int usb_verify_eps(const struct libusb_interface_descriptor *iface)
{
unsigned int i, eps = iface->bNumEndpoints;
/* Check that we have an even number of endpoints, and that input/output
* endpoints are interleaved */
if (eps < 2 || eps % 2)
return -EINVAL;
for (i = 0; i < eps; i += 2) {
if (!(iface->endpoint[i + 0].bEndpointAddress
& LIBUSB_ENDPOINT_IN))
return -EINVAL;
if (iface->endpoint[i + 1].bEndpointAddress
& LIBUSB_ENDPOINT_IN)
return -EINVAL;
}
return 0;
}
static int usb_populate_context_attrs(struct iio_context *ctx,
libusb_device *dev, libusb_device_handle *hdl)
{
struct iio_context_pdata *pdata = iio_context_get_pdata(ctx);
struct libusb_device_descriptor dev_desc;
char buffer[64];
unsigned int i;
int ret;
char uri[sizeof("usb:127.255.255")];
struct {
const char *attr;
uint8_t idx;
} attrs[3];
libusb_get_device_descriptor(dev, &dev_desc);
attrs[0].attr = "usb,vendor";
attrs[0].idx = dev_desc.iManufacturer;
attrs[1].attr = "usb,product";
attrs[1].idx = dev_desc.iProduct;
attrs[2].attr = "usb,serial";
attrs[2].idx = dev_desc.iSerialNumber;
iio_snprintf(uri, sizeof(uri), "usb:%d.%d.%u",
libusb_get_bus_number(dev), libusb_get_device_address(dev),
(uint8_t)pdata->intrfc);
ret = iio_context_add_attr(ctx, "uri", uri);
if (ret < 0)
return ret;
iio_snprintf(buffer, sizeof(buffer), "%04hx", dev_desc.idVendor);
ret = iio_context_add_attr(ctx, "usb,idVendor", buffer);
if (ret < 0)
return ret;
iio_snprintf(buffer, sizeof(buffer), "%04hx", dev_desc.idProduct);
ret = iio_context_add_attr(ctx, "usb,idProduct", buffer);
if (ret < 0)
return ret;
iio_snprintf(buffer, sizeof(buffer), "%1hhx.%1hhx",
(unsigned char)((dev_desc.bcdUSB >> 8) & 0xf),
(unsigned char)((dev_desc.bcdUSB >> 4) & 0xf));
ret = iio_context_add_attr(ctx, "usb,release", buffer);
if (ret < 0)
return ret;
for (i = 0; i < ARRAY_SIZE(attrs); i++) {
if (attrs[i].idx) {
ret = libusb_get_string_descriptor_ascii(hdl,
attrs[i].idx, (unsigned char *) buffer,
sizeof(buffer));
if (ret < 0)
return -(int) libusb_to_errno(ret);
ret = iio_context_add_attr(ctx, attrs[i].attr, buffer);
if (ret < 0)
return ret;
}
}
#ifdef HAS_LIBUSB_GETVERSION
/*
* libusb_get_version was added 2012-04-17: v1.0.10,
* before LIBUSB_API_VERSION was added - Jan 8, 2014
* so, you can't use that to determine if it is here
*/
{
struct libusb_version const *ver = libusb_get_version();
iio_snprintf(buffer, sizeof(buffer), "%i.%i.%i.%i%s",
ver->major, ver->minor, ver->micro,
ver->nano, ver->rc);
ret = iio_context_add_attr(ctx, "usb,libusb", buffer);
if (ret < 0)
return ret;
}
#endif
return 0;
}
static struct iio_context * usb_create_context(unsigned int bus,
uint16_t address, uint16_t intrfc)
{
libusb_context *usb_ctx;
libusb_device_handle *hdl = NULL;
const struct libusb_interface_descriptor *iface;
libusb_device *usb_dev;
struct libusb_config_descriptor *conf_desc;
libusb_device **device_list;
struct iio_context *ctx;
struct iio_context_pdata *pdata;
char err_str[1024];
uint16_t i;
int ret;
pdata = zalloc(sizeof(*pdata));
if (!pdata) {
IIO_ERROR("Unable to allocate pdata\n");
ret = -ENOMEM;
goto err_set_errno;
}
pdata->ep_lock = iio_mutex_create();
if (!pdata->ep_lock) {
IIO_ERROR("Unable to create mutex\n");
ret = -ENOMEM;
goto err_free_pdata;
}
pdata->iiod_client = iiod_client_new(pdata, &usb_iiod_client_ops);
if (!pdata->iiod_client) {
IIO_ERROR("Unable to create IIOD client\n");
ret = -errno;
goto err_destroy_ep_mutex;
}
ret = libusb_init(&usb_ctx);
if (ret) {
ret = -(int) libusb_to_errno(ret);
IIO_ERROR("Unable to init libusb: %i\n", ret);
goto err_destroy_iiod_client;
}
ret = (int) libusb_get_device_list(usb_ctx, &device_list);
if (ret < 0) {
ret = -(int) libusb_to_errno(ret);
IIO_ERROR("Unable to get usb device list: %i\n", ret);
goto err_libusb_exit;
}
usb_dev = NULL;
for (i = 0; device_list[i]; i++) {
libusb_device *dev = device_list[i];
if (bus == libusb_get_bus_number(dev) &&
address == libusb_get_device_address(dev)) {
usb_dev = dev;
ret = libusb_open(usb_dev, &hdl);
/*
* Workaround for libusb on Windows >= 8.1. A device
* might appear twice in the list with one device being
* bogus and only partially initialized. libusb_open()
* returns LIBUSB_ERROR_NOT_SUPPORTED for such devices,
* which should never happen for normal devices. So if
* we find such a device skip it and keep looking.
*/
if (ret == LIBUSB_ERROR_NOT_SUPPORTED) {
IIO_WARNING("Skipping broken USB device. Please upgrade libusb.\n");
usb_dev = NULL;
continue;
}
break;
}
}
libusb_free_device_list(device_list, true);
if (!usb_dev || !hdl) {
ret = -ENODEV;
goto err_libusb_exit;
}
if (ret) {
ret = -(int) libusb_to_errno(ret);
IIO_ERROR("Unable to open device\n");
goto err_libusb_exit;
}
#if defined(LIBUSB_API_VERSION) && (LIBUSB_API_VERSION >= 0x01000016)
libusb_set_auto_detach_kernel_driver(hdl, true);
#endif
ret = libusb_claim_interface(hdl, intrfc);
if (ret) {
ret = -(int) libusb_to_errno(ret);
iio_strerror(-ret, err_str, sizeof(err_str));
IIO_ERROR("Unable to claim interface %u:%u:%u: %s\n",
bus, address, intrfc, err_str);
goto err_libusb_close;
}
ret = libusb_get_active_config_descriptor(usb_dev, &conf_desc);
if (ret) {
ret = -(int) libusb_to_errno(ret);
iio_strerror(-ret, err_str, sizeof(err_str));
IIO_ERROR("Unable to get config descriptor: %s\n", err_str);
goto err_libusb_close;
}
iface = &conf_desc->interface[intrfc].altsetting[0];
ret = usb_verify_eps(iface);
if (ret) {
IIO_ERROR("Invalid configuration of endpoints\n");
goto err_free_config_descriptor;
}
pdata->nb_ep_couples = iface->bNumEndpoints / 2;
IIO_DEBUG("Found %hu usable i/o endpoint couples\n", pdata->nb_ep_couples);
pdata->io_endpoints = calloc(pdata->nb_ep_couples,
sizeof(*pdata->io_endpoints));
if (!pdata->io_endpoints) {
IIO_ERROR("Unable to allocate endpoints\n");
ret = -ENOMEM;
goto err_free_config_descriptor;
}
for (i = 0; i < pdata->nb_ep_couples; i++) {
struct iio_usb_ep_couple *ep = &pdata->io_endpoints[i];
ep->addr_in = iface->endpoint[i * 2 + 0].bEndpointAddress;
ep->addr_out = iface->endpoint[i * 2 + 1].bEndpointAddress;
ep->pipe_id = i;
IIO_DEBUG("Couple %i with endpoints 0x%x / 0x%x\n", i,
ep->addr_in, ep->addr_out);
ep->lock = iio_mutex_create();
if (!ep->lock) {
IIO_ERROR("Unable to create mutex\n");
ret = -ENOMEM;
goto err_free_endpoints;
}
}
pdata->ctx = usb_ctx;
pdata->hdl = hdl;
pdata->timeout_ms = DEFAULT_TIMEOUT_MS;
pdata->intrfc = intrfc;
ret = usb_io_context_init(&pdata->io_ctx);
if (ret)
goto err_free_endpoints;
/* We reserve the first I/O endpoint couple for global operations */
pdata->io_ctx.ep = &pdata->io_endpoints[0];
pdata->io_ctx.ep->in_use = true;
ret = usb_reset_pipes(pdata);
if (ret) {
iio_strerror(-ret, err_str, sizeof(err_str));
IIO_ERROR("Failed to reset pipes: %s\n", err_str);
goto err_io_context_exit;
}
ret = usb_open_pipe(pdata, 0);
if (ret) {
iio_strerror(-ret, err_str, sizeof(err_str));
IIO_ERROR("Failed to open control pipe: %s\n", err_str);
goto err_io_context_exit;
}
ctx = iiod_client_create_context(pdata->iiod_client, &pdata->io_ctx);
if (!ctx) {
ret = -errno;
goto err_reset_pipes;
}
libusb_free_config_descriptor(conf_desc);
ctx->name = "usb";
ctx->ops = &usb_ops;
ctx->pdata = pdata;