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Message-Id: <1290084457-26422-1-git-send-email-tlinder@codeaurora.org>
Date: Thu, 18 Nov 2010 14:47:36 +0200
From: Tatyana Brokhman <tlinder@...eaurora.org>
To: gregkh@...e.de
Cc: linux-usb@...r.kernel.org, linux-arm-msm@...r.kernel.org,
Tatyana Brokhman <tlinder@...eaurora.org>,
David Brownell <dbrownell@...rs.sourceforge.net>,
linux-kernel@...r.kernel.org
Subject: [PATCH v4 2/4] usb gadget: Configure endpoint according to gadget speed.
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 <tlinder@...eaurora.org>
---
drivers/usb/gadget/composite.c | 76 +++++++++++++++++++++++++++++++++++++++
drivers/usb/gadget/epautoconf.c | 1 +
include/linux/usb/composite.h | 21 +++++++++++
include/linux/usb/gadget.h | 3 ++
4 files changed, 101 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 7b5cc16..99fb27d 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -74,6 +74,82 @@ 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;
+}
+
+/**
+ * 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 in 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 choosen 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 (d_spd = next_ep_desc(speed_desc); d_spd;
+ d_spd = next_ep_desc(d_spd+1)) {
+ chosen_desc = (struct usb_endpoint_descriptor *)*d_spd;
+ if (chosen_desc->bEndpointAddress == _ep->bEndpointAddress)
+ 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 8a83248..84ce0fa 100644
--- a/drivers/usb/gadget/epautoconf.c
+++ b/drivers/usb/gadget/epautoconf.c
@@ -184,6 +184,7 @@ ep_matches (
size = 64;
desc->wMaxPacketSize = cpu_to_le16(size);
}
+ ep->bEndpointAddress = desc->bEndpointAddress;
return 1;
}
diff --git a/include/linux/usb/composite.h b/include/linux/usb/composite.h
index 3d29a7d..b0c78cd 100644
--- a/include/linux/usb/composite.h
+++ b/include/linux/usb/composite.h
@@ -138,6 +138,27 @@ int usb_function_activate(struct usb_function *);
int usb_interface_id(struct usb_configuration *, struct usb_function *);
/**
+ * 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 in 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 choosen 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);
+
+/**
* ep_choose - select descriptor endpoint at current device speed
* @g: gadget, connected and running at some speed
* @hs: descriptor to use for high speed operation
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 937c8fa..f1c8256 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.
+ * @bEndpointAddress: 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 bEndpointAddress;
const struct usb_endpoint_descriptor *desc;
};
--
1.6.3.3
--
Sent by an employee of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.
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