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Message-ID: <20110411141404.GC4018@linutronix.de>
Date: Mon, 11 Apr 2011 16:14:04 +0200
From: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To: Tatyana Brokhman <tlinder@...eaurora.org>
Cc: gregkh@...e.de, linux-arm-msm@...r.kernel.org, balbi@...com,
ablay@...eaurora.org,
"open list:USB GADGET/PERIPH..." <linux-usb@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH/RESEND 3/5 v4] usb: Configure endpoint according to
gadget speed.
* Tatyana Brokhman | 2011-03-23 10:04:04 [+0200]:
>diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
>index c2251c4..fb7e488 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
^it
>+ * 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)) {
this might look better if you would something like the list_for_each()
macro.
>+ 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/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
>+ */
You have the same comment (including the same typo) here and in the .c.
Please use only on (in the .c file) as they will go async.
>+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 500ae91..0387aba 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.
> *
Sebastian
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