Add config_ep_by_speed() to configure the endpoint according to the gadget speed. Using this function will spare the FDs from handling the endpoint chosen descriptor.
Signed-off-by: Tatyana Brokhman <[email protected]> --- drivers/usb/gadget/composite.c | 85 +++++++++++++++++++++++++++++++++++++++ drivers/usb/gadget/epautoconf.c | 1 + include/linux/usb/composite.h | 3 + include/linux/usb/gadget.h | 3 + 4 files changed, 92 insertions(+), 0 deletions(-) diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index 5cbb1a4..1c6bd66 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -74,6 +74,91 @@ MODULE_PARM_DESC(iSerialNumber, "SerialNumber string"); static char composite_manufacturer[50]; /*-------------------------------------------------------------------------*/ +/** + * next_ep_desc() - advance to the next EP descriptor + * @t: currect pointer within descriptor array + * + * Return: next EP descriptor or NULL + * + * Iterate over @t until either EP descriptor found or + * NULL (that indicates end of list) encountered + */ +static struct usb_descriptor_header** +next_ep_desc(struct usb_descriptor_header **t) +{ + for (; *t; t++) { + if ((*t)->bDescriptorType == USB_DT_ENDPOINT) + return t; + } + return NULL; +} + +/* + * for_each_ep_desc()- iterate over endpoint descriptors in the + * descriptors list + * @start: pointer within descriptor array. + * @ep_desc: endpoint descriptor to use as the loop cursor + */ +#define for_each_ep_desc(start, ep_desc) \ + for (ep_desc = next_ep_desc(start); \ + ep_desc; ep_desc = next_ep_desc(ep_desc+1)) + +/** + * config_ep_by_speed() - configures the given endpoint + * according to gadget speed. + * @g: pointer to the gadget + * @f: usb function + * @_ep: the endpoint to configure + * + * Return: error code, 0 on success + * + * This function chooses the right descriptors for a given + * endpoint according to gadget speed and saves it in the + * endpoint desc field. If the endpoint already has a descriptor + * assigned to it - overwrites it with currently corresponding + * descriptor. The endpoint maxpacket field is updated according + * to the chosen descriptor. + * Note: the supplied function should hold all the descriptors + * for supported speeds + */ +int config_ep_by_speed(struct usb_gadget *g, + struct usb_function *f, + struct usb_ep *_ep) +{ + struct usb_endpoint_descriptor *chosen_desc = NULL; + struct usb_descriptor_header **speed_desc = NULL; + + struct usb_descriptor_header **d_spd; /* cursor for speed desc */ + + if (!g || !f || !_ep) + return -EIO; + + /* select desired speed */ + switch (g->speed) { + case USB_SPEED_HIGH: + if (gadget_is_dualspeed(g)) { + speed_desc = f->hs_descriptors; + break; + } + /* else: fall through */ + default: + speed_desc = f->descriptors; + } + /* find descriptors */ + for_each_ep_desc(speed_desc, d_spd) { + chosen_desc = (struct usb_endpoint_descriptor *)*d_spd; + if (chosen_desc->bEndpointAddress == _ep->address) + goto ep_found; + } + return -EIO; + +ep_found: + /* commit results */ + _ep->maxpacket = le16_to_cpu(chosen_desc->wMaxPacketSize); + _ep->desc = chosen_desc; + + return 0; +} /** * usb_add_function() - add a function to a configuration diff --git a/drivers/usb/gadget/epautoconf.c b/drivers/usb/gadget/epautoconf.c index 9b7360f..0022d44 100644 --- a/drivers/usb/gadget/epautoconf.c +++ b/drivers/usb/gadget/epautoconf.c @@ -191,6 +191,7 @@ ep_matches ( size = 64; desc->wMaxPacketSize = cpu_to_le16(size); } + ep->address = desc->bEndpointAddress; return 1; } diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h index b78cba4..2014d6b 100644 --- a/include/linux/usb/composite.h +++ b/include/linux/usb/composite.h @@ -145,6 +145,9 @@ int usb_function_activate(struct usb_function *); int usb_interface_id(struct usb_configuration *, struct usb_function *); +int config_ep_by_speed(struct usb_gadget *g, struct usb_function *f, + struct usb_ep *_ep); + /** * ep_choose - select descriptor endpoint at current device speed * @g: gadget, connected and running at some speed diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h index 5c4c30c..8015ceb 100644 --- a/include/linux/usb/gadget.h +++ b/include/linux/usb/gadget.h @@ -132,6 +132,8 @@ struct usb_ep_ops { * value can sometimes be reduced (hardware allowing), according to * the endpoint descriptor used to configure the endpoint. * @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. * @@ -146,6 +148,7 @@ struct usb_ep { const struct usb_ep_ops *ops; struct list_head ep_list; unsigned maxpacket:16; + u8 address; const struct usb_endpoint_descriptor *desc; }; -- 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. -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
