This patch adds the SuperSpeed functionality to the gadget framework.
Support for new SuperSpeed BOS descriptor was added.
Support for SET_FEATURE and GET_STATUS requests in SuperSpeed mode was
added.
Signed-off-by: Tatyana Brokhman <[email protected]>
---
drivers/usb/gadget/Kconfig | 11 ++
drivers/usb/gadget/composite.c | 253 ++++++++++++++++++++++++++++++++++++---
drivers/usb/gadget/epautoconf.c | 7 +-
include/linux/usb/ch9.h | 2 -
include/linux/usb/composite.h | 16 +++
include/linux/usb/gadget.h | 34 +++++
6 files changed, 301 insertions(+), 22 deletions(-)
diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
index 58456d1..61aa0ff 100644
--- a/drivers/usb/gadget/Kconfig
+++ b/drivers/usb/gadget/Kconfig
@@ -640,6 +640,17 @@ config USB_GADGET_DUALSPEED
Means that gadget drivers should include extra descriptors
and code to handle dual-speed controllers.
+config USB_GADGET_SUPERSPEED
+ boolean "Gadget operating in Super Speed"
+ depends on USB_GADGET
+ depends on USB_GADGET_DUALSPEED
+ help
+ Enabling this feature enables Super Speed support in the Gadget
+ driver. It means that gadget drivers should provide extra (SuperSpeed)
+ descriptors to the host.
+ For composite devices: if SuperSpeed descriptors weren't supplied by
+ the FD, they will be automatically generated with default values.
+
#
# USB Gadget Drivers
#
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 1c6bd66..7738302 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -128,6 +128,9 @@ int config_ep_by_speed(struct usb_gadget *g,
struct usb_endpoint_descriptor *chosen_desc = NULL;
struct usb_descriptor_header **speed_desc = NULL;
+ struct usb_ss_ep_comp_descriptor *comp_desc = NULL;
+ int want_comp_desc = 0;
+
struct usb_descriptor_header **d_spd; /* cursor for speed desc */
if (!g || !f || !_ep)
@@ -135,6 +138,13 @@ int config_ep_by_speed(struct usb_gadget *g,
/* select desired speed */
switch (g->speed) {
+ case USB_SPEED_SUPER:
+ if (gadget_is_superspeed(g)) {
+ speed_desc = f->ss_descriptors;
+ want_comp_desc = 1;
+ break;
+ }
+ /* else: Fall trough */
case USB_SPEED_HIGH:
if (gadget_is_dualspeed(g)) {
speed_desc = f->hs_descriptors;
@@ -156,7 +166,36 @@ ep_found:
/* commit results */
_ep->maxpacket = le16_to_cpu(chosen_desc->wMaxPacketSize);
_ep->desc = chosen_desc;
+ _ep->comp_desc = NULL;
+ _ep->maxburst = 0;
+ _ep->mult = 0;
+ if (!want_comp_desc)
+ return 0;
+ /*
+ * Companion descriptor should follow EP descriptor
+ * USB 3.0 spec, #9.6.7
+ */
+ comp_desc = (struct usb_ss_ep_comp_descriptor *)*(++d_spd);
+ if (!comp_desc ||
+ (comp_desc->bDescriptorType != USB_DT_SS_ENDPOINT_COMP))
+ return -EIO;
+ _ep->comp_desc = comp_desc;
+ if (g->speed == USB_SPEED_SUPER) {
+ switch (usb_endpoint_type(_ep->desc)) {
+ case USB_ENDPOINT_XFER_BULK:
+ case USB_ENDPOINT_XFER_INT:
+ _ep->maxburst = comp_desc->bMaxBurst;
+ break;
+ case USB_ENDPOINT_XFER_ISOC:
+ /* mult: bits 1:0 of bmAttributes */
+ _ep->mult = comp_desc->bmAttributes & 0x3;
+ break;
+ default:
+ /* Do nothing for control endpoints */
+ break;
+ }
+ }
return 0;
}
@@ -208,6 +247,8 @@ int usb_add_function(struct usb_configuration *config,
config->fullspeed = true;
if (!config->highspeed && function->hs_descriptors)
config->highspeed = true;
+ if (!config->superspeed && function->ss_descriptors)
+ config->superspeed = true;
done:
if (value)
@@ -351,10 +392,17 @@ static int config_buf(struct usb_configuration *config,
list_for_each_entry(f, &config->functions, list) {
struct usb_descriptor_header **descriptors;
- if (speed == USB_SPEED_HIGH)
+ switch (speed) {
+ case USB_SPEED_SUPER:
+ descriptors = f->ss_descriptors;
+ break;
+ case USB_SPEED_HIGH:
descriptors = f->hs_descriptors;
- else
+ break;
+ default:
descriptors = f->descriptors;
+ }
+
if (!descriptors)
continue;
status = usb_descriptor_fillbuf(next, len,
@@ -377,9 +425,10 @@ static int config_desc(struct usb_composite_dev *cdev, unsigned w_value)
u8 type = w_value >> 8;
enum usb_device_speed speed = USB_SPEED_UNKNOWN;
- if (gadget_is_dualspeed(gadget)) {
- int hs = 0;
-
+ if (gadget->speed == USB_SPEED_SUPER)
+ speed = gadget->speed;
+ else if (gadget_is_dualspeed(gadget)) {
+ int hs = 0;
if (gadget->speed == USB_SPEED_HIGH)
hs = 1;
if (type == USB_DT_OTHER_SPEED_CONFIG)
@@ -393,13 +442,20 @@ static int config_desc(struct usb_composite_dev *cdev, unsigned w_value)
w_value &= 0xff;
list_for_each_entry(c, &cdev->configs, list) {
/* ignore configs that won't work at this speed */
- if (speed == USB_SPEED_HIGH) {
+ switch (speed) {
+ case USB_SPEED_SUPER:
+ if (!c->superspeed)
+ continue;
+ break;
+ case USB_SPEED_HIGH:
if (!c->highspeed)
continue;
- } else {
+ break;
+ default:
if (!c->fullspeed)
continue;
}
+
if (w_value == 0)
return config_buf(c, speed, cdev->req->buf, type);
w_value--;
@@ -413,16 +469,22 @@ static int count_configs(struct usb_composite_dev *cdev, unsigned type)
struct usb_configuration *c;
unsigned count = 0;
int hs = 0;
+ int ss = 0;
if (gadget_is_dualspeed(gadget)) {
if (gadget->speed == USB_SPEED_HIGH)
hs = 1;
+ if (gadget->speed == USB_SPEED_SUPER)
+ ss = 1;
if (type == USB_DT_DEVICE_QUALIFIER)
hs = !hs;
}
list_for_each_entry(c, &cdev->configs, list) {
/* ignore configs that won't work at this speed */
- if (hs) {
+ if (ss) {
+ if (!c->superspeed)
+ continue;
+ } else if (hs) {
if (!c->highspeed)
continue;
} else {
@@ -434,6 +496,71 @@ static int count_configs(struct usb_composite_dev *cdev, unsigned type)
return count;
}
+/**
+ * bos_desc() - prepares the BOS descriptor.
+ * @cdev: pointer to usb_composite device to generate the bos
+ * descriptor for
+ *
+ * This function generates the BOS (Binary Device Object)
+ * descriptor and its device capabilities descriptors. The BOS
+ * descriptor should be supported by a SuperSpeed device.
+ */
+static int bos_desc(struct usb_composite_dev *cdev)
+{
+ struct usb_ext_cap_descriptor *usb_ext;
+ struct usb_ss_cap_descriptor *ss_cap;
+ struct usb_dcd_config_params dcd_config_params;
+ struct usb_bos_descriptor *bos = cdev->req->buf;
+
+ bos->bLength = USB_DT_BOS_SIZE;
+ bos->bDescriptorType = USB_DT_BOS;
+
+ bos->wTotalLength = cpu_to_le16(USB_DT_BOS_SIZE);
+ bos->bNumDeviceCaps = 0;
+
+ /*
+ * A SuperSpeed device shall include the USB2.0 extension descriptor
+ * and shall support LPM when operating in USB2.0 HS mode.
+ */
+ usb_ext = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
+ bos->bNumDeviceCaps++;
+ le16_add_cpu(&bos->wTotalLength, USB_DT_USB_EXT_CAP_SIZE);
+ usb_ext->bLength = USB_DT_USB_EXT_CAP_SIZE;
+ usb_ext->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
+ usb_ext->bDevCapabilityType = USB_CAP_TYPE_EXT;
+ usb_ext->bmAttributes = cpu_to_le32(USB_LPM_SUPPORT);
+
+ /*
+ * The Superspeed USB Capability descriptor shall be implemented by all
+ * SuperSpeed devices.
+ */
+ ss_cap = cdev->req->buf + le16_to_cpu(bos->wTotalLength);
+ bos->bNumDeviceCaps++;
+ le16_add_cpu(&bos->wTotalLength, USB_DT_USB_SS_CAP_SIZE);
+ ss_cap->bLength = USB_DT_USB_SS_CAP_SIZE;
+ ss_cap->bDescriptorType = USB_DT_DEVICE_CAPABILITY;
+ ss_cap->bDevCapabilityType = USB_SS_CAP_TYPE;
+ ss_cap->bmAttributes = 0; /* LTM is not supported yet */
+ ss_cap->wSpeedSupported = cpu_to_le16(USB_LOW_SPEED_OPERATION |
+ USB_FULL_SPEED_OPERATION |
+ USB_HIGH_SPEED_OPERATION |
+ USB_5GBPS_OPERATION);
+ ss_cap->bFunctionalitySupport = USB_LOW_SPEED_OPERATION;
+
+ /* Get Controller configuration */
+ if (cdev->gadget->ops->get_config_params)
+ cdev->gadget->ops->get_config_params(&dcd_config_params);
+ else {
+ dcd_config_params.bU1devExitLat = USB_DEFULT_U1_DEV_EXIT_LAT;
+ dcd_config_params.bU2DevExitLat =
+ cpu_to_le16(USB_DEFULT_U2_DEV_EXIT_LAT);
+ }
+ ss_cap->bU1devExitLat = dcd_config_params.bU1devExitLat;
+ ss_cap->bU2DevExitLat = dcd_config_params.bU2DevExitLat;
+
+ return le16_to_cpu(bos->wTotalLength);
+}
+
static void device_qual(struct usb_composite_dev *cdev)
{
struct usb_qualifier_descriptor *qual = cdev->req->buf;
@@ -477,20 +604,27 @@ static int set_config(struct usb_composite_dev *cdev,
unsigned power = gadget_is_otg(gadget) ? 8 : 100;
int tmp;
- if (cdev->config)
- reset_config(cdev);
-
if (number) {
list_for_each_entry(c, &cdev->configs, list) {
if (c->bConfigurationValue == number) {
+ /*
+ * We disable the FDs of the previous
+ * configuration only if the new configuration
+ * is a valid one
+ */
+ if (cdev->config)
+ reset_config(cdev);
result = 0;
break;
}
}
if (result < 0)
goto done;
- } else
+ } else { /* Zero configuration value - need to reset the config */
+ if (cdev->config)
+ reset_config(cdev);
result = 0;
+ }
INFO(cdev, "%s speed config #%d: %s\n",
({ char *speed;
@@ -498,6 +632,7 @@ static int set_config(struct usb_composite_dev *cdev,
case USB_SPEED_LOW: speed = "low"; break;
case USB_SPEED_FULL: speed = "full"; break;
case USB_SPEED_HIGH: speed = "high"; break;
+ case USB_SPEED_SUPER: speed = "super"; break;
default: speed = "?"; break;
} ; speed; }), number, c ? c->label : "unconfigured");
@@ -520,10 +655,16 @@ static int set_config(struct usb_composite_dev *cdev,
* function's setup callback instead of the current
* configuration's setup callback.
*/
- if (gadget->speed == USB_SPEED_HIGH)
+ switch (gadget->speed) {
+ case USB_SPEED_SUPER:
+ descriptors = f->ss_descriptors;
+ break;
+ case USB_SPEED_HIGH:
descriptors = f->hs_descriptors;
- else
+ break;
+ default:
descriptors = f->descriptors;
+ }
for (; *descriptors; ++descriptors) {
struct usb_endpoint_descriptor *ep;
@@ -616,8 +757,9 @@ int usb_add_config(struct usb_composite_dev *cdev,
} else {
unsigned i;
- DBG(cdev, "cfg %d/%p speeds:%s%s\n",
+ DBG(cdev, "cfg %d/%p speeds:%s%s%s\n",
config->bConfigurationValue, config,
+ config->superspeed ? " super" : "",
config->highspeed ? " high" : "",
config->fullspeed
? (gadget_is_dualspeed(cdev->gadget)
@@ -896,6 +1038,7 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
struct usb_composite_dev *cdev = get_gadget_data(gadget);
struct usb_request *req = cdev->req;
int value = -EOPNOTSUPP;
+ int status = 0;
u16 w_index = le16_to_cpu(ctrl->wIndex);
u8 intf = w_index & 0xFF;
u16 w_value = le16_to_cpu(ctrl->wValue);
@@ -923,18 +1066,29 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
case USB_DT_DEVICE:
cdev->desc.bNumConfigurations =
count_configs(cdev, USB_DT_DEVICE);
+ cdev->desc.bMaxPacketSize0 =
+ cdev->gadget->ep0->maxpacket;
+ if (gadget_is_superspeed(gadget)) {
+ if (gadget->speed >= USB_SPEED_SUPER)
+ cdev->desc.bcdUSB = cpu_to_le16(0x0300);
+ else
+ cdev->desc.bcdUSB = cpu_to_le16(0x0210);
+ }
+
value = min(w_length, (u16) sizeof cdev->desc);
memcpy(req->buf, &cdev->desc, value);
break;
case USB_DT_DEVICE_QUALIFIER:
- if (!gadget_is_dualspeed(gadget))
+ if (!gadget_is_dualspeed(gadget) ||
+ gadget->speed >= USB_SPEED_SUPER)
break;
device_qual(cdev);
value = min_t(int, w_length,
sizeof(struct usb_qualifier_descriptor));
break;
case USB_DT_OTHER_SPEED_CONFIG:
- if (!gadget_is_dualspeed(gadget))
+ if (!gadget_is_dualspeed(gadget) ||
+ gadget->speed >= USB_SPEED_SUPER)
break;
/* FALLTHROUGH */
case USB_DT_CONFIG:
@@ -948,6 +1102,12 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
if (value >= 0)
value = min(w_length, (u16) value);
break;
+ case USB_DT_BOS:
+ if (gadget_is_superspeed(gadget)) {
+ value = bos_desc(cdev);
+ value = min(w_length, (u16) value);
+ }
+ break;
}
break;
@@ -1015,6 +1175,62 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
*((u8 *)req->buf) = value;
value = min(w_length, (u16) 1);
break;
+
+ /*
+ * USB 3.0 additions:
+ * Function driver should handle get_status request. If such cb
+ * wasn't supplied we respond with default value = 0
+ * Note: function driver should supply such cb only for the first
+ * interface of the function
+ */
+ case USB_REQ_GET_STATUS:
+ if (!gadget_is_superspeed(gadget))
+ goto unknown;
+ if (ctrl->bRequestType != (USB_DIR_IN | USB_RECIP_INTERFACE))
+ goto unknown;
+ value = 2; /* This is the length of the get_status reply */
+ *((__le16 *)req->buf) = 0;
+ if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
+ break;
+ f = cdev->config->interface[intf];
+ if (!f)
+ break;
+ status = f->get_status ? f->get_status(f) : 0;
+ if (status < 0)
+ break;
+ *((__le16 *)req->buf) = cpu_to_le16(status & 0x0000ffff);
+ break;
+ /*
+ * Function drivers should handle SetFeature/ClearFeature
+ * (FUNCTION_SUSPEND) request. function_suspend cb should be supplied
+ * only for the first interface of the function
+ */
+ case USB_REQ_CLEAR_FEATURE:
+ case USB_REQ_SET_FEATURE:
+ if (!gadget_is_superspeed(gadget))
+ goto unknown;
+ if (ctrl->bRequestType != (USB_DIR_OUT | USB_RECIP_INTERFACE))
+ goto unknown;
+ switch (w_value) {
+ case USB_INTRF_FUNC_SUSPEND:
+ if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
+ break;
+ f = cdev->config->interface[intf];
+ if (!f)
+ break;
+ value = 0;
+ if (f->func_suspend)
+ value = f->func_suspend(f, w_index >> 8);
+ if (value < 0) {
+ ERROR(cdev, "func_suspend() returned "
+ "error %d\n", value);
+ value = 0;
+ }
+ break;
+ default:
+ break;
+ }
+ break;
default:
unknown:
VDBG(cdev,
@@ -1378,6 +1594,9 @@ int usb_composite_probe(struct usb_composite_driver *driver,
driver->iProduct = driver->name;
composite_driver.function = (char *) driver->name;
composite_driver.driver.name = driver->name;
+#ifdef CONFIG_USB_GADGET_SUPERSPEED
+ composite_driver.speed = USB_SPEED_SUPER;
+#endif /* CONFIG_USB_GADGET_SUPERSPEED */
composite = driver;
composite_gadget_bind = bind;
diff --git a/drivers/usb/gadget/epautoconf.c b/drivers/usb/gadget/epautoconf.c
index 0022d44..b9e0b6d 100644
--- a/drivers/usb/gadget/epautoconf.c
+++ b/drivers/usb/gadget/epautoconf.c
@@ -142,13 +142,13 @@ ep_matches (
max = 0x7ff & le16_to_cpu(desc->wMaxPacketSize);
switch (type) {
case USB_ENDPOINT_XFER_INT:
- /* INT: limit 64 bytes full speed, 1024 high speed */
+ /* INT: limit 64 bytes full speed, 1024 high/super speed */
if (!gadget->is_dualspeed && max > 64)
return 0;
/* FALLTHROUGH */
case USB_ENDPOINT_XFER_ISOC:
- /* ISO: limit 1023 bytes full speed, 1024 high speed */
+ /* ISO: limit 1023 bytes full speed, 1024 high/super speed */
if (ep->maxpacket < max)
return 0;
if (!gadget->is_dualspeed && max > 1023)
@@ -183,7 +183,8 @@ ep_matches (
}
/* report (variable) full speed bulk maxpacket */
- if (USB_ENDPOINT_XFER_BULK == type) {
+ if ((USB_ENDPOINT_XFER_BULK == type)
+ && (gadget->speed < USB_SPEED_HIGH)) {
int size = ep->maxpacket;
/* min() doesn't work on bitfields with gcc-3.5 */
diff --git a/include/linux/usb/ch9.h b/include/linux/usb/ch9.h
index 0fd3fbd..7654b64 100644
--- a/include/linux/usb/ch9.h
+++ b/include/linux/usb/ch9.h
@@ -142,8 +142,6 @@
#define USB_DEVICE_LTM_ENABLE 50 /* dev may send LTM */
#define USB_INTRF_FUNC_SUSPEND 0 /* function suspend */
-#define USB_INTR_FUNC_SUSPEND_OPT_MASK 0xFF00
-
#define USB_ENDPOINT_HALT 0 /* IN/OUT will STALL */
/* Bit array elements as returned by the USB_REQ_GET_STATUS request. */
diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h
index 99830d6..e28e12f 100644
--- a/include/linux/usb/composite.h
+++ b/include/linux/usb/composite.h
@@ -59,6 +59,12 @@ struct usb_configuration;
* @hs_descriptors: Table of high speed descriptors, using interface and
* string identifiers assigned during @bind(). If this pointer is null,
* the function will not be available at high speed.
+ * @ss_descriptors: Table of super speed descriptors. If
+ * wasnt supplied by the FD during @bind() and
+ * !ss_not_capble, will be generated automaticly with
+ * default values while working in superspeed mode. If this
+ * pointer is null after initiation, the function will not
+ * be available at super speed.
* @config: assigned when @usb_add_function() is called; this is the
* configuration with which this function is associated.
* @bind: Before the gadget can register, all of its functions bind() to the
@@ -77,6 +83,10 @@ struct usb_configuration;
* @setup: Used for interface-specific control requests.
* @suspend: Notifies functions when the host stops sending USB traffic.
* @resume: Notifies functions when the host restarts USB traffic.
+ * @get_status: Returns function status as a reply to
+ * GetStatus() request when the recepient is Interface.
+ * @func_suspend: callback to be called when
+ * SetFeature(FUNCTION_SUSPEND) is reseived
*
* A single USB function uses one or more interfaces, and should in most
* cases support operation at both full and high speeds. Each function is
@@ -106,6 +116,7 @@ struct usb_function {
struct usb_gadget_strings **strings;
struct usb_descriptor_header **descriptors;
struct usb_descriptor_header **hs_descriptors;
+ struct usb_descriptor_header **ss_descriptors;
struct usb_configuration *config;
@@ -132,6 +143,10 @@ struct usb_function {
void (*suspend)(struct usb_function *);
void (*resume)(struct usb_function *);
+ /* USB 3.0 additions */
+ int (*get_status)(struct usb_function *);
+ int (*func_suspend)(struct usb_function *,
+ u8 suspend_opt);
/* private: */
/* internals */
struct list_head list;
@@ -219,6 +234,7 @@ struct usb_configuration {
struct list_head list;
struct list_head functions;
u8 next_interface_id;
+ unsigned superspeed:1;
unsigned highspeed:1;
unsigned fullspeed:1;
struct usb_function *interface[MAX_CONFIG_INTERFACES];
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 318c815..d1b4ee8 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -131,11 +131,15 @@ struct usb_ep_ops {
* @maxpacket:The maximum packet size used on this endpoint. The initial
* value can sometimes be reduced (hardware allowing), according to
* the endpoint descriptor used to configure the endpoint.
+ * @mult: multiplier, 'mult' value for SS Isoc EPs
+ * @maxburst: the maximum number of bursts supported by this EP (for usb3)
* @driver_data:for use by the gadget driver.
* @address: used to identify the endpoint when finding descriptor that
* matches connection speed
* @desc: endpoint descriptor. This pointer is set before the endpoint is
* enabled and remains valid until the endpoint is disabled.
+ * @comp_desc: In case of SuperSpeed support, this is the endpoint companion
+ * descriptor that is used to configure the endpoint
*
* the bus controller driver lists all the general purpose endpoints in
* gadget->ep_list. the control endpoint (gadget->ep0) is not in that list,
@@ -148,8 +152,12 @@ struct usb_ep {
const struct usb_ep_ops *ops;
struct list_head ep_list;
unsigned maxpacket:16;
+ unsigned mult:2;
+ unsigned pad:1;
+ unsigned maxburst:4;
u8 address;
const struct usb_endpoint_descriptor *desc;
+ const struct usb_ss_ep_comp_descriptor *comp_desc;
};
/*-------------------------------------------------------------------------*/
@@ -417,6 +425,14 @@ static inline void usb_ep_fifo_flush(struct usb_ep *ep)
/*-------------------------------------------------------------------------*/
+struct usb_dcd_config_params {
+ __u8 bU1devExitLat; /* U1 Device exit Latency */
+#define USB_DEFULT_U1_DEV_EXIT_LAT 0x01 /* Less then 1 microsec */
+ __le16 bU2DevExitLat; /* U2 Device exit Latency */
+#define USB_DEFULT_U2_DEV_EXIT_LAT 0x1F4 /* Less then 500 microsec */
+};
+
+
struct usb_gadget;
/* the rest of the api to the controller hardware: device operations,
@@ -431,6 +447,7 @@ struct usb_gadget_ops {
int (*pullup) (struct usb_gadget *, int is_on);
int (*ioctl)(struct usb_gadget *,
unsigned code, unsigned long param);
+ void (*get_config_params)(struct usb_dcd_config_params *);
};
/**
@@ -522,6 +539,23 @@ static inline int gadget_is_dualspeed(struct usb_gadget *g)
}
/**
+ * gadget_is_superspeed() - return true if the hardware handles
+ * supperspeed
+ * @g: controller that might support supper speed
+ */
+static inline int gadget_is_superspeed(struct usb_gadget *g)
+{
+#ifdef CONFIG_USB_GADGET_SUPERSPEED
+ /* runtime test would check "g->is_superspeed" ... that might be
+ * useful to work around hardware bugs, but is mostly pointless
+ */
+ return 1;
+#else
+ return 0;
+#endif
+}
+
+/**
* gadget_is_otg - return true iff the hardware is OTG-ready
* @g: controller that might have a Mini-AB connector
*
--
1.7.3.3
--
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
* Tatyana Brokhman | 2011-05-23 09:41:13 [+0300]:
>diff --git a/drivers/usb/gadget/composite.c
>b/drivers/usb/gadget/composite.c
>index 1c6bd66..7738302 100644
>--- a/drivers/usb/gadget/composite.c
>+++ b/drivers/usb/gadget/composite.c
>@@ -1015,6 +1175,62 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
> *((u8 *)req->buf) = value;
> value = min(w_length, (u16) 1);
> break;
>+
>+ /*
>+ * USB 3.0 additions:
>+ * Function driver should handle get_status request. If such cb
>+ * wasn't supplied we respond with default value = 0
>+ * Note: function driver should supply such cb only for the first
>+ * interface of the function
>+ */
>+ case USB_REQ_GET_STATUS:
>+ if (!gadget_is_superspeed(gadget))
>+ goto unknown;
>+ if (ctrl->bRequestType != (USB_DIR_IN | USB_RECIP_INTERFACE))
>+ goto unknown;
>+ value = 2; /* This is the length of the get_status reply */
>+ *((__le16 *)req->buf) = 0;
Mike please correct me if I'm wrong bug this looks like a case for
put_unaligned_le16().
Is someone actually using gadget support on blackfin? I'm asking because
config_buf() (same file, upstream) is using req->buf to build the
descriptors in place and one element is le16 which should be affected.
>+ if (!cdev->config || intf >= MAX_CONFIG_INTERFACES)
>+ break;
>+ f = cdev->config->interface[intf];
>+ if (!f)
>+ break;
>+ status = f->get_status ? f->get_status(f) : 0;
>+ if (status < 0)
>+ break;
>+ *((__le16 *)req->buf) = cpu_to_le16(status & 0x0000ffff);
and here.
>+ break;
Sebastian
On Mon, May 23, 2011 at 08:31, Sebastian Andrzej Siewior wrote:
> * Tatyana Brokhman | 2011-05-23 09:41:13 [+0300]:
>>diff --git a/drivers/usb/gadget/composite.c
>>b/drivers/usb/gadget/composite.c
>>index 1c6bd66..7738302 100644
>>--- a/drivers/usb/gadget/composite.c
>>+++ b/drivers/usb/gadget/composite.c
>>@@ -1015,6 +1175,62 @@ composite_setup(struct usb_gadget *gadget, const struct usb_ctrlrequest *ctrl)
>> *((u8 *)req->buf) = value;
>> value = min(w_length, (u16) 1);
>> break;
>>+
>>+ /*
>>+ * USB 3.0 additions:
>>+ * Function driver should handle get_status request. If such cb
>>+ * wasn't supplied we respond with default value = 0
>>+ * Note: function driver should supply such cb only for the first
>>+ * interface of the function
>>+ */
>>+ case USB_REQ_GET_STATUS:
>>+ if (!gadget_is_superspeed(gadget))
>>+ goto unknown;
>>+ if (ctrl->bRequestType != (USB_DIR_IN | USB_RECIP_INTERFACE))
>>+ goto unknown;
>>+ value = 2; /* This is the length of the get_status reply */
>>+ *((__le16 *)req->buf) = 0;
>
> Mike please correct me if I'm wrong bug this looks like a case for
> put_unaligned_le16().
> Is someone actually using gadget support on blackfin? I'm asking because
> config_buf() (same file, upstream) is using req->buf to build the
> descriptors in place and one element is le16 which should be affected.
yes, we do gadget stuff heavily on Blackfin with a few different
controllers. if things broke, we'd be unhappy ;).
-mike
Hi Sebastian,
> >+ case USB_REQ_GET_STATUS:
> >+ if (!gadget_is_superspeed(gadget))
> >+ goto unknown;
> >+ if (ctrl->bRequestType != (USB_DIR_IN |
> USB_RECIP_INTERFACE))
> >+ goto unknown;
> >+ value = 2; /* This is the length of the get_status
reply
> */
> >+ *((__le16 *)req->buf) = 0;
>
> Mike please correct me if I'm wrong bug this looks like a case for
> put_unaligned_le16().
> Is someone actually using gadget support on blackfin? I'm asking
> because
> config_buf() (same file, upstream) is using req->buf to build the
> descriptors in place and one element is le16 which should be affected.
>
Mike answered that you're right in your observation. I'm not familiar with
blackfin. Could you please elaborate on this? I understand that I need to
use put_unaligned_le16(), will do, but I would like to better understand why
and if there is a way to test this so that blackfin won't be broken.
Best regards,
Tanya Brokhman
Consultant for Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum
On Tue, May 24, 2011 at 01:10, Tanya Brokhman wrote:
>> >+ case USB_REQ_GET_STATUS:
>> >+ if (!gadget_is_superspeed(gadget))
>> >+ goto unknown;
>> >+ if (ctrl->bRequestType != (USB_DIR_IN | USB_RECIP_INTERFACE))
>> >+ goto unknown;
>> >+ value = 2; /* This is the length of the get_status
>> >+ *((__le16 *)req->buf) = 0;
>>
>> Mike please correct me if I'm wrong bug this looks like a case for
>> put_unaligned_le16().
>> Is someone actually using gadget support on blackfin? I'm asking
>> because
>> config_buf() (same file, upstream) is using req->buf to build the
>> descriptors in place and one element is le16 which should be affected.
>
> Mike answered that you're right in your observation. I'm not familiar with
> blackfin. Could you please elaborate on this? I understand that I need to
> use put_unaligned_le16(), will do, but I would like to better understand why
> and if there is a way to test this so that blackfin won't be broken.
not all arches support unaligned accesses. or they do, but it's done
via (non-trivial) exception processing in software. req->buf is of
type void* and so presumably is not guaranteed to be aligned on a 2
byte boundary.
-mike
> >
> > Mike answered that you're right in your observation. I'm not familiar
> with
> > blackfin. Could you please elaborate on this? I understand that I
> need to
> > use put_unaligned_le16(), will do, but I would like to better
> understand why
> > and if there is a way to test this so that blackfin won't be broken.
>
> not all arches support unaligned accesses. or they do, but it's done
> via (non-trivial) exception processing in software. req->buf is of
> type void* and so presumably is not guaranteed to be aligned on a 2
> byte boundary.
> -mike
Thanks for the explanation, Mike! I'll update the patch.
Best regards,
Tanya Brokhman
Consultant for Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum
On Tue, May 24, 2011 at 01:37, Tanya Brokhman wrote:
>> > Mike answered that you're right in your observation. I'm not familiar
>> > with blackfin. Could you please elaborate on this? I understand that
>> > I need to use put_unaligned_le16(), will do, but I would like to better
>> > understand why and if there is a way to test this so that blackfin
>> > won't be broken.
>>
>> not all arches support unaligned accesses. or they do, but it's done
>> via (non-trivial) exception processing in software. req->buf is of
>> type void* and so presumably is not guaranteed to be aligned on a 2
>> byte boundary.
>
> Thanks for the explanation, Mike! I'll update the patch.
also, for arches where unaligned accesses work (like x86), the
unaligned macros will simply expand to direct accesses like the code
you had originally.
-mike