#include <linux/mm.h>
#include <linux/timer.h>
#include <linux/ctype.h>
+#include <linux/nls.h>
#include <linux/device.h>
#include <linux/scatterlist.h>
#include <linux/usb/quirks.h>
int i;
int urb_flags;
int dma;
+ int use_sg;
if (!io || !dev || !sg
|| usb_pipecontrol(pipe)
if (io->entries <= 0)
return io->entries;
- io->urbs = kmalloc(io->entries * sizeof *io->urbs, mem_flags);
+ if (dev->bus->sg_tablesize > 0) {
+ io->urbs = kmalloc(sizeof *io->urbs, mem_flags);
+ use_sg = true;
+ } else {
+ io->urbs = kmalloc(io->entries * sizeof *io->urbs, mem_flags);
+ use_sg = false;
+ }
if (!io->urbs)
goto nomem;
- urb_flags = URB_NO_INTERRUPT;
+ urb_flags = 0;
if (dma)
urb_flags |= URB_NO_TRANSFER_DMA_MAP;
if (usb_pipein(pipe))
urb_flags |= URB_SHORT_NOT_OK;
- for_each_sg(sg, sg, io->entries, i) {
- unsigned len;
-
- io->urbs[i] = usb_alloc_urb(0, mem_flags);
- if (!io->urbs[i]) {
- io->entries = i;
+ if (use_sg) {
+ io->urbs[0] = usb_alloc_urb(0, mem_flags);
+ if (!io->urbs[0]) {
+ io->entries = 0;
goto nomem;
}
- io->urbs[i]->dev = NULL;
- io->urbs[i]->pipe = pipe;
- io->urbs[i]->interval = period;
- io->urbs[i]->transfer_flags = urb_flags;
-
- io->urbs[i]->complete = sg_complete;
- io->urbs[i]->context = io;
-
- /*
- * Some systems need to revert to PIO when DMA is temporarily
- * unavailable. For their sakes, both transfer_buffer and
- * transfer_dma are set when possible. However this can only
- * work on systems without:
- *
- * - HIGHMEM, since DMA buffers located in high memory are
- * not directly addressable by the CPU for PIO;
- *
- * - IOMMU, since dma_map_sg() is allowed to use an IOMMU to
- * make virtually discontiguous buffers be "dma-contiguous"
- * so that PIO and DMA need diferent numbers of URBs.
- *
- * So when HIGHMEM or IOMMU are in use, transfer_buffer is NULL
- * to prevent stale pointers and to help spot bugs.
- */
- if (dma) {
- io->urbs[i]->transfer_dma = sg_dma_address(sg);
- len = sg_dma_len(sg);
-#if defined(CONFIG_HIGHMEM) || defined(CONFIG_GART_IOMMU)
- io->urbs[i]->transfer_buffer = NULL;
-#else
- io->urbs[i]->transfer_buffer = sg_virt(sg);
-#endif
- } else {
- /* hc may use _only_ transfer_buffer */
- io->urbs[i]->transfer_buffer = sg_virt(sg);
- len = sg->length;
+ io->urbs[0]->dev = NULL;
+ io->urbs[0]->pipe = pipe;
+ io->urbs[0]->interval = period;
+ io->urbs[0]->transfer_flags = urb_flags;
+
+ io->urbs[0]->complete = sg_complete;
+ io->urbs[0]->context = io;
+ /* A length of zero means transfer the whole sg list */
+ io->urbs[0]->transfer_buffer_length = length;
+ if (length == 0) {
+ for_each_sg(sg, sg, io->entries, i) {
+ io->urbs[0]->transfer_buffer_length +=
+ sg_dma_len(sg);
+ }
}
+ io->urbs[0]->sg = io;
+ io->urbs[0]->num_sgs = io->entries;
+ io->entries = 1;
+ } else {
+ urb_flags |= URB_NO_INTERRUPT;
+ for_each_sg(sg, sg, io->entries, i) {
+ unsigned len;
+
+ io->urbs[i] = usb_alloc_urb(0, mem_flags);
+ if (!io->urbs[i]) {
+ io->entries = i;
+ goto nomem;
+ }
+
+ io->urbs[i]->dev = NULL;
+ io->urbs[i]->pipe = pipe;
+ io->urbs[i]->interval = period;
+ io->urbs[i]->transfer_flags = urb_flags;
+
+ io->urbs[i]->complete = sg_complete;
+ io->urbs[i]->context = io;
- if (length) {
- len = min_t(unsigned, len, length);
- length -= len;
- if (length == 0)
- io->entries = i + 1;
+ /*
+ * Some systems need to revert to PIO when DMA is temporarily
+ * unavailable. For their sakes, both transfer_buffer and
+ * transfer_dma are set when possible.
+ *
+ * Note that if IOMMU coalescing occurred, we cannot
+ * trust sg_page anymore, so check if S/G list shrunk.
+ */
+ if (io->nents == io->entries && !PageHighMem(sg_page(sg)))
+ io->urbs[i]->transfer_buffer = sg_virt(sg);
+ else
+ io->urbs[i]->transfer_buffer = NULL;
+
+ if (dma) {
+ io->urbs[i]->transfer_dma = sg_dma_address(sg);
+ len = sg_dma_len(sg);
+ } else {
+ /* hc may use _only_ transfer_buffer */
+ len = sg->length;
+ }
+
+ if (length) {
+ len = min_t(unsigned, len, length);
+ length -= len;
+ if (length == 0)
+ io->entries = i + 1;
+ }
+ io->urbs[i]->transfer_buffer_length = len;
}
- io->urbs[i]->transfer_buffer_length = len;
+ io->urbs[--i]->transfer_flags &= ~URB_NO_INTERRUPT;
}
- io->urbs[--i]->transfer_flags &= ~URB_NO_INTERRUPT;
/* transaction state */
io->count = io->entries;
* could be transferred. That capability is less useful for low or full
* speed interrupt endpoints, which allow at most one packet per millisecond,
* of at most 8 or 64 bytes (respectively).
+ *
+ * It is not necessary to call this function to reserve bandwidth for devices
+ * under an xHCI host controller, as the bandwidth is reserved when the
+ * configuration or interface alt setting is selected.
*/
void usb_sg_wait(struct usb_sg_request *io)
{
return rc;
}
+static int usb_get_langid(struct usb_device *dev, unsigned char *tbuf)
+{
+ int err;
+
+ if (dev->have_langid)
+ return 0;
+
+ if (dev->string_langid < 0)
+ return -EPIPE;
+
+ err = usb_string_sub(dev, 0, 0, tbuf);
+
+ /* If the string was reported but is malformed, default to english
+ * (0x0409) */
+ if (err == -ENODATA || (err > 0 && err < 4)) {
+ dev->string_langid = 0x0409;
+ dev->have_langid = 1;
+ dev_err(&dev->dev,
+ "string descriptor 0 malformed (err = %d), "
+ "defaulting to 0x%04x\n",
+ err, dev->string_langid);
+ return 0;
+ }
+
+ /* In case of all other errors, we assume the device is not able to
+ * deal with strings at all. Set string_langid to -1 in order to
+ * prevent any string to be retrieved from the device */
+ if (err < 0) {
+ dev_err(&dev->dev, "string descriptor 0 read error: %d\n",
+ err);
+ dev->string_langid = -1;
+ return -EPIPE;
+ }
+
+ /* always use the first langid listed */
+ dev->string_langid = tbuf[2] | (tbuf[3] << 8);
+ dev->have_langid = 1;
+ dev_dbg(&dev->dev, "default language 0x%04x\n",
+ dev->string_langid);
+ return 0;
+}
+
/**
- * usb_string - returns ISO 8859-1 version of a string descriptor
+ * usb_string - returns UTF-8 version of a string descriptor
* @dev: the device whose string descriptor is being retrieved
* @index: the number of the descriptor
* @buf: where to put the string
* Context: !in_interrupt ()
*
* This converts the UTF-16LE encoded strings returned by devices, from
- * usb_get_string_descriptor(), to null-terminated ISO-8859-1 encoded ones
- * that are more usable in most kernel contexts. Note that all characters
- * in the chosen descriptor that can't be encoded using ISO-8859-1
- * are converted to the question mark ("?") character, and this function
+ * usb_get_string_descriptor(), to null-terminated UTF-8 encoded ones
+ * that are more usable in most kernel contexts. Note that this function
* chooses strings in the first language supported by the device.
*
- * The ASCII (or, redundantly, "US-ASCII") character set is the seven-bit
- * subset of ISO 8859-1. ISO-8859-1 is the eight-bit subset of Unicode,
- * and is appropriate for use many uses of English and several other
- * Western European languages. (But it doesn't include the "Euro" symbol.)
- *
* This call is synchronous, and may not be used in an interrupt context.
*
* Returns length of the string (>= 0) or usb_control_msg status (< 0).
{
unsigned char *tbuf;
int err;
- unsigned int u, idx;
if (dev->state == USB_STATE_SUSPENDED)
return -EHOSTUNREACH;
if (!tbuf)
return -ENOMEM;
- /* get langid for strings if it's not yet known */
- if (!dev->have_langid) {
- err = usb_string_sub(dev, 0, 0, tbuf);
- if (err < 0) {
- dev_err(&dev->dev,
- "string descriptor 0 read error: %d\n",
- err);
- } else if (err < 4) {
- dev_err(&dev->dev, "string descriptor 0 too short\n");
- } else {
- dev->string_langid = tbuf[2] | (tbuf[3] << 8);
- /* always use the first langid listed */
- dev_dbg(&dev->dev, "default language 0x%04x\n",
- dev->string_langid);
- }
-
- dev->have_langid = 1;
- }
+ err = usb_get_langid(dev, tbuf);
+ if (err < 0)
+ goto errout;
err = usb_string_sub(dev, dev->string_langid, index, tbuf);
if (err < 0)
goto errout;
size--; /* leave room for trailing NULL char in output buffer */
- for (idx = 0, u = 2; u < err; u += 2) {
- if (idx >= size)
- break;
- if (tbuf[u+1]) /* high byte */
- buf[idx++] = '?'; /* non ISO-8859-1 character */
- else
- buf[idx++] = tbuf[u];
- }
- buf[idx] = 0;
- err = idx;
+ err = utf16s_to_utf8s((wchar_t *) &tbuf[2], (err - 2) / 2,
+ UTF16_LITTLE_ENDIAN, buf, size);
+ buf[err] = 0;
if (tbuf[1] != USB_DT_STRING)
dev_dbg(&dev->dev,
}
EXPORT_SYMBOL_GPL(usb_string);
+/* one UTF-8-encoded 16-bit character has at most three bytes */
+#define MAX_USB_STRING_SIZE (127 * 3 + 1)
+
/**
* usb_cache_string - read a string descriptor and cache it for later use
* @udev: the device whose string descriptor is being read
if (index <= 0)
return NULL;
- buf = kmalloc(256, GFP_KERNEL);
+ buf = kmalloc(MAX_USB_STRING_SIZE, GFP_NOIO);
if (buf) {
- len = usb_string(udev, index, buf, 256);
+ len = usb_string(udev, index, buf, MAX_USB_STRING_SIZE);
if (len > 0) {
- smallbuf = kmalloc(++len, GFP_KERNEL);
+ smallbuf = kmalloc(++len, GFP_NOIO);
if (!smallbuf)
return buf;
memcpy(smallbuf, buf, len);
* the copy in usb-storage, for as long as we need two copies.
*/
- /* toggle was reset by the clear */
- usb_settoggle(dev, usb_pipeendpoint(pipe), usb_pipeout(pipe), 0);
+ usb_reset_endpoint(dev, endp);
return 0;
}
}
/**
+ * usb_reset_endpoint - Reset an endpoint's state.
+ * @dev: the device whose endpoint is to be reset
+ * @epaddr: the endpoint's address. Endpoint number for output,
+ * endpoint number + USB_DIR_IN for input
+ *
+ * Resets any host-side endpoint state such as the toggle bit,
+ * sequence number or current window.
+ */
+void usb_reset_endpoint(struct usb_device *dev, unsigned int epaddr)
+{
+ unsigned int epnum = epaddr & USB_ENDPOINT_NUMBER_MASK;
+ struct usb_host_endpoint *ep;
+
+ if (usb_endpoint_out(epaddr))
+ ep = dev->ep_out[epnum];
+ else
+ ep = dev->ep_in[epnum];
+ if (ep)
+ usb_hcd_reset_endpoint(dev, ep);
+}
+EXPORT_SYMBOL_GPL(usb_reset_endpoint);
+
+
+/**
* usb_disable_interface -- Disable all endpoints for an interface
* @dev: the device whose interface is being disabled
* @intf: pointer to the interface descriptor
usb_disable_endpoint(dev, i, true);
usb_disable_endpoint(dev, i + USB_DIR_IN, true);
}
- dev->toggle[0] = dev->toggle[1] = 0;
/* getting rid of interfaces will disconnect
* any drivers bound to them (a key side effect)
* usb_enable_endpoint - Enable an endpoint for USB communications
* @dev: the device whose interface is being enabled
* @ep: the endpoint
- * @reset_toggle: flag to set the endpoint's toggle back to 0
+ * @reset_ep: flag to reset the endpoint state
*
- * Resets the endpoint toggle if asked, and sets dev->ep_{in,out} pointers.
+ * Resets the endpoint state if asked, and sets dev->ep_{in,out} pointers.
* For control endpoints, both the input and output sides are handled.
*/
void usb_enable_endpoint(struct usb_device *dev, struct usb_host_endpoint *ep,
- bool reset_toggle)
+ bool reset_ep)
{
int epnum = usb_endpoint_num(&ep->desc);
int is_out = usb_endpoint_dir_out(&ep->desc);
int is_control = usb_endpoint_xfer_control(&ep->desc);
- if (is_out || is_control) {
- if (reset_toggle)
- usb_settoggle(dev, epnum, 1, 0);
+ if (reset_ep)
+ usb_hcd_reset_endpoint(dev, ep);
+ if (is_out || is_control)
dev->ep_out[epnum] = ep;
- }
- if (!is_out || is_control) {
- if (reset_toggle)
- usb_settoggle(dev, epnum, 0, 0);
+ if (!is_out || is_control)
dev->ep_in[epnum] = ep;
- }
ep->enabled = 1;
}
* usb_enable_interface - Enable all the endpoints for an interface
* @dev: the device whose interface is being enabled
* @intf: pointer to the interface descriptor
- * @reset_toggles: flag to set the endpoints' toggles back to 0
+ * @reset_eps: flag to reset the endpoints' state
*
* Enables all the endpoints for the interface's current altsetting.
*/
void usb_enable_interface(struct usb_device *dev,
- struct usb_interface *intf, bool reset_toggles)
+ struct usb_interface *intf, bool reset_eps)
{
struct usb_host_interface *alt = intf->cur_altsetting;
int i;
for (i = 0; i < alt->desc.bNumEndpoints; ++i)
- usb_enable_endpoint(dev, &alt->endpoint[i], reset_toggles);
+ usb_enable_endpoint(dev, &alt->endpoint[i], reset_eps);
}
/**
{
struct usb_interface *iface;
struct usb_host_interface *alt;
+ struct usb_hcd *hcd = bus_to_hcd(dev->bus);
int ret;
int manual = 0;
unsigned int epaddr;
return -EINVAL;
}
+ /* Make sure we have enough bandwidth for this alternate interface.
+ * Remove the current alt setting and add the new alt setting.
+ */
+ mutex_lock(&hcd->bandwidth_mutex);
+ ret = usb_hcd_alloc_bandwidth(dev, NULL, iface->cur_altsetting, alt);
+ if (ret < 0) {
+ dev_info(&dev->dev, "Not enough bandwidth for altsetting %d\n",
+ alternate);
+ mutex_unlock(&hcd->bandwidth_mutex);
+ return ret;
+ }
+
if (dev->quirks & USB_QUIRK_NO_SET_INTF)
ret = -EPIPE;
else
"manual set_interface for iface %d, alt %d\n",
interface, alternate);
manual = 1;
- } else if (ret < 0)
+ } else if (ret < 0) {
+ /* Re-instate the old alt setting */
+ usb_hcd_alloc_bandwidth(dev, NULL, alt, iface->cur_altsetting);
+ mutex_unlock(&hcd->bandwidth_mutex);
return ret;
+ }
+ mutex_unlock(&hcd->bandwidth_mutex);
/* FIXME drivers shouldn't need to replicate/bugfix the logic here
* when they implement async or easily-killable versions of this or
* This issues a standard SET_CONFIGURATION request to the device using
* the current configuration. The effect is to reset most USB-related
* state in the device, including interface altsettings (reset to zero),
- * endpoint halts (cleared), and data toggle (only for bulk and interrupt
+ * endpoint halts (cleared), and endpoint state (only for bulk and interrupt
* endpoints). Other usbcore state is unchanged, including bindings of
* usb device drivers to interfaces.
*
* (multi-interface) devices. Instead, the driver for each interface may
* use usb_set_interface() on the interfaces it claims. Be careful though;
* some devices don't support the SET_INTERFACE request, and others won't
- * reset all the interface state (notably data toggles). Resetting the whole
+ * reset all the interface state (notably endpoint state). Resetting the whole
* configuration would affect other drivers' interfaces.
*
* The caller must own the device lock.
{
int i, retval;
struct usb_host_config *config;
+ struct usb_hcd *hcd = bus_to_hcd(dev->bus);
if (dev->state == USB_STATE_SUSPENDED)
return -EHOSTUNREACH;
}
config = dev->actconfig;
+ retval = 0;
+ mutex_lock(&hcd->bandwidth_mutex);
+ /* Make sure we have enough bandwidth for each alternate setting 0 */
+ for (i = 0; i < config->desc.bNumInterfaces; i++) {
+ struct usb_interface *intf = config->interface[i];
+ struct usb_host_interface *alt;
+
+ alt = usb_altnum_to_altsetting(intf, 0);
+ if (!alt)
+ alt = &intf->altsetting[0];
+ if (alt != intf->cur_altsetting)
+ retval = usb_hcd_alloc_bandwidth(dev, NULL,
+ intf->cur_altsetting, alt);
+ if (retval < 0)
+ break;
+ }
+ /* If not, reinstate the old alternate settings */
+ if (retval < 0) {
+reset_old_alts:
+ for (; i >= 0; i--) {
+ struct usb_interface *intf = config->interface[i];
+ struct usb_host_interface *alt;
+
+ alt = usb_altnum_to_altsetting(intf, 0);
+ if (!alt)
+ alt = &intf->altsetting[0];
+ if (alt != intf->cur_altsetting)
+ usb_hcd_alloc_bandwidth(dev, NULL,
+ alt, intf->cur_altsetting);
+ }
+ mutex_unlock(&hcd->bandwidth_mutex);
+ return retval;
+ }
retval = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
USB_REQ_SET_CONFIGURATION, 0,
config->desc.bConfigurationValue, 0,
NULL, 0, USB_CTRL_SET_TIMEOUT);
if (retval < 0)
- return retval;
-
- dev->toggle[0] = dev->toggle[1] = 0;
+ goto reset_old_alts;
+ mutex_unlock(&hcd->bandwidth_mutex);
/* re-init hc/hcd interface/endpoint state */
for (i = 0; i < config->desc.bNumInterfaces; i++) {
*
* See usb_queue_reset_device() for more details
*/
-void __usb_queue_reset_device(struct work_struct *ws)
+static void __usb_queue_reset_device(struct work_struct *ws)
{
int rc;
struct usb_interface *iface =
int i, ret;
struct usb_host_config *cp = NULL;
struct usb_interface **new_interfaces = NULL;
+ struct usb_hcd *hcd = bus_to_hcd(dev->bus);
int n, nintf;
if (dev->authorized == 0 || configuration == -1)
if (cp) {
nintf = cp->desc.bNumInterfaces;
new_interfaces = kmalloc(nintf * sizeof(*new_interfaces),
- GFP_KERNEL);
+ GFP_NOIO);
if (!new_interfaces) {
dev_err(&dev->dev, "Out of memory\n");
return -ENOMEM;
for (; n < nintf; ++n) {
new_interfaces[n] = kzalloc(
sizeof(struct usb_interface),
- GFP_KERNEL);
+ GFP_NOIO);
if (!new_interfaces[n]) {
dev_err(&dev->dev, "Out of memory\n");
ret = -ENOMEM;
if (ret)
goto free_interfaces;
+ /* Make sure we have bandwidth (and available HCD resources) for this
+ * configuration. Remove endpoints from the schedule if we're dropping
+ * this configuration to set configuration 0. After this point, the
+ * host controller will not allow submissions to dropped endpoints. If
+ * this call fails, the device state is unchanged.
+ */
+ mutex_lock(&hcd->bandwidth_mutex);
+ ret = usb_hcd_alloc_bandwidth(dev, cp, NULL, NULL);
+ if (ret < 0) {
+ usb_autosuspend_device(dev);
+ mutex_unlock(&hcd->bandwidth_mutex);
+ goto free_interfaces;
+ }
+
/* if it's already configured, clear out old state first.
* getting rid of old interfaces means unbinding their drivers.
*/
dev->actconfig = cp;
if (!cp) {
usb_set_device_state(dev, USB_STATE_ADDRESS);
+ usb_hcd_alloc_bandwidth(dev, NULL, NULL, NULL);
usb_autosuspend_device(dev);
+ mutex_unlock(&hcd->bandwidth_mutex);
goto free_interfaces;
}
+ mutex_unlock(&hcd->bandwidth_mutex);
usb_set_device_state(dev, USB_STATE_CONFIGURED);
/* Initialize the new interface structures and the
* routine gets around the normal restrictions by using a work thread to
* submit the change-config request.
*
- * Returns 0 if the request was succesfully queued, error code otherwise.
+ * Returns 0 if the request was successfully queued, error code otherwise.
* The caller has no way to know whether the queued request will eventually
* succeed.
*/
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff