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Date: Fri, 27 Nov 2015 11:59:13 +0100
From: Robert Baldyga <r.baldyga@...sung.com>
To: balbi@...com
Cc: gregkh@...uxfoundation.org, andrzej.p@...sung.com,
m.szyprowski@...sung.com, b.zolnierkie@...sung.com,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
Robert Baldyga <r.baldyga@...sung.com>
Subject: [PATCH v2 19/29] usb: gadget: f_loopback: convert to new API
Generate descriptors in new format and attach them to USB function in
prep_descs(). Change set_alt() implementation and implement clear_alt()
operation. Remove unnecessary boilerplate code.
Call usb_config_do_bind() in legacy gadget zero, because it uses
usb_add_config_only() instead of usb_add_config() and prepares
configuration manually.
Signed-off-by: Robert Baldyga <r.baldyga@...sung.com>
---
drivers/usb/gadget/function/f_loopback.c | 162 ++++++-------------------------
drivers/usb/gadget/legacy/zero.c | 3 +
2 files changed, 33 insertions(+), 132 deletions(-)
diff --git a/drivers/usb/gadget/function/f_loopback.c b/drivers/usb/gadget/function/f_loopback.c
index 7d1fa10..14ba8a9 100644
--- a/drivers/usb/gadget/function/f_loopback.c
+++ b/drivers/usb/gadget/function/f_loopback.c
@@ -76,13 +76,6 @@ static struct usb_endpoint_descriptor fs_loop_sink_desc = {
.bmAttributes = USB_ENDPOINT_XFER_BULK,
};
-static struct usb_descriptor_header *fs_loopback_descs[] = {
- (struct usb_descriptor_header *) &loopback_intf,
- (struct usb_descriptor_header *) &fs_loop_sink_desc,
- (struct usb_descriptor_header *) &fs_loop_source_desc,
- NULL,
-};
-
/* high speed support: */
static struct usb_endpoint_descriptor hs_loop_source_desc = {
@@ -101,13 +94,6 @@ static struct usb_endpoint_descriptor hs_loop_sink_desc = {
.wMaxPacketSize = cpu_to_le16(512),
};
-static struct usb_descriptor_header *hs_loopback_descs[] = {
- (struct usb_descriptor_header *) &loopback_intf,
- (struct usb_descriptor_header *) &hs_loop_source_desc,
- (struct usb_descriptor_header *) &hs_loop_sink_desc,
- NULL,
-};
-
/* super speed support: */
static struct usb_endpoint_descriptor ss_loop_source_desc = {
@@ -142,14 +128,17 @@ static struct usb_ss_ep_comp_descriptor ss_loop_sink_comp_desc = {
.wBytesPerInterval = 0,
};
-static struct usb_descriptor_header *ss_loopback_descs[] = {
- (struct usb_descriptor_header *) &loopback_intf,
- (struct usb_descriptor_header *) &ss_loop_source_desc,
- (struct usb_descriptor_header *) &ss_loop_source_comp_desc,
- (struct usb_descriptor_header *) &ss_loop_sink_desc,
- (struct usb_descriptor_header *) &ss_loop_sink_comp_desc,
- NULL,
-};
+USB_COMPOSITE_ENDPOINT(ep_source, &fs_loop_source_desc, &hs_loop_source_desc,
+ &ss_loop_source_desc, &ss_loop_source_comp_desc);
+USB_COMPOSITE_ENDPOINT(ep_sink, &fs_loop_sink_desc, &hs_loop_sink_desc,
+ &ss_loop_sink_desc, &ss_loop_sink_comp_desc);
+
+USB_COMPOSITE_ALTSETTING(altset0, &loopback_intf, &ep_source, &ep_sink);
+
+USB_COMPOSITE_INTERFACE(intf0, &altset0);
+
+USB_COMPOSITE_DESCRIPTORS(loopback_descs, &intf0);
+
/* function-specific strings: */
@@ -170,18 +159,10 @@ static struct usb_gadget_strings *loopback_strings[] = {
/*-------------------------------------------------------------------------*/
-static int loopback_bind(struct usb_configuration *c, struct usb_function *f)
+static int loopback_prep_descs(struct usb_function *f)
{
- struct usb_composite_dev *cdev = c->cdev;
- struct f_loopback *loop = func_to_loop(f);
- int id;
- int ret;
-
- /* allocate interface ID(s) */
- id = usb_interface_id(c, f);
- if (id < 0)
- return id;
- loopback_intf.bInterfaceNumber = id;
+ struct usb_composite_dev *cdev = f->config->cdev;
+ int id;
id = usb_string_id(cdev);
if (id < 0)
@@ -189,40 +170,7 @@ static int loopback_bind(struct usb_configuration *c, struct usb_function *f)
strings_loopback[0].id = id;
loopback_intf.iInterface = id;
- /* allocate endpoints */
-
- loop->in_ep = usb_ep_autoconfig(cdev->gadget, &fs_loop_source_desc);
- if (!loop->in_ep) {
-autoconf_fail:
- ERROR(cdev, "%s: can't autoconfigure on %s\n",
- f->name, cdev->gadget->name);
- return -ENODEV;
- }
-
- loop->out_ep = usb_ep_autoconfig(cdev->gadget, &fs_loop_sink_desc);
- if (!loop->out_ep)
- goto autoconf_fail;
-
- /* support high speed hardware */
- hs_loop_source_desc.bEndpointAddress =
- fs_loop_source_desc.bEndpointAddress;
- hs_loop_sink_desc.bEndpointAddress = fs_loop_sink_desc.bEndpointAddress;
-
- /* support super speed hardware */
- ss_loop_source_desc.bEndpointAddress =
- fs_loop_source_desc.bEndpointAddress;
- ss_loop_sink_desc.bEndpointAddress = fs_loop_sink_desc.bEndpointAddress;
-
- ret = usb_assign_descriptors(f, fs_loopback_descs, hs_loopback_descs,
- ss_loopback_descs);
- if (ret)
- return ret;
-
- DBG(cdev, "%s speed %s: IN/%s, OUT/%s\n",
- (gadget_is_superspeed(c->cdev->gadget) ? "super" :
- (gadget_is_dualspeed(c->cdev->gadget) ? "dual" : "full")),
- f->name, loop->in_ep->name, loop->out_ep->name);
- return 0;
+ return usb_function_set_descs(f, &loopback_descs);
}
static void lb_free_func(struct usb_function *f)
@@ -235,7 +183,6 @@ static void lb_free_func(struct usb_function *f)
opts->refcnt--;
mutex_unlock(&opts->lock);
- usb_free_all_descriptors(f);
kfree(func_to_loop(f));
}
@@ -285,15 +232,6 @@ static void loopback_complete(struct usb_ep *ep, struct usb_request *req)
}
}
-static void disable_loopback(struct f_loopback *loop)
-{
- struct usb_composite_dev *cdev;
-
- cdev = loop->function.config->cdev;
- disable_endpoints(cdev, loop->in_ep, loop->out_ep, NULL, NULL);
- VDBG(cdev, "%s disabled\n", loop->function.name);
-}
-
static inline struct usb_request *lb_alloc_ep_req(struct usb_ep *ep, int len)
{
struct f_loopback *loop = ep->driver_data;
@@ -348,70 +286,30 @@ fail:
return result;
}
-static int enable_endpoint(struct usb_composite_dev *cdev,
- struct f_loopback *loop, struct usb_ep *ep)
-{
- int result;
-
- result = config_ep_by_speed(cdev->gadget, &(loop->function), ep);
- if (result)
- goto out;
-
- result = usb_ep_enable(ep);
- if (result < 0)
- goto out;
- ep->driver_data = loop;
- result = 0;
-
-out:
- return result;
-}
-
-static int
-enable_loopback(struct usb_composite_dev *cdev, struct f_loopback *loop)
-{
- int result = 0;
-
- result = enable_endpoint(cdev, loop, loop->in_ep);
- if (result)
- goto out;
-
- result = enable_endpoint(cdev, loop, loop->out_ep);
- if (result)
- goto disable_in;
-
- result = alloc_requests(cdev, loop);
- if (result)
- goto disable_out;
-
- DBG(cdev, "%s enabled\n", loop->function.name);
- return 0;
-
-disable_out:
- usb_ep_disable(loop->out_ep);
-disable_in:
- usb_ep_disable(loop->in_ep);
-out:
- return result;
-}
-
static int loopback_set_alt(struct usb_function *f,
unsigned intf, unsigned alt)
{
struct f_loopback *loop = func_to_loop(f);
struct usb_composite_dev *cdev = f->config->cdev;
- /* we know alt is zero */
- disable_loopback(loop);
- return enable_loopback(cdev, loop);
+ loop->in_ep = usb_function_get_ep(f, intf, 0);
+ if (!loop->in_ep)
+ return -ENODEV;
+ loop->in_ep->driver_data = loop;
+
+ loop->out_ep = usb_function_get_ep(f, intf, 1);
+ if (!loop->out_ep)
+ return -ENODEV;
+ loop->out_ep->driver_data = loop;
+
+ return alloc_requests(cdev, loop);
}
-static void loopback_disable(struct usb_function *f)
+static void loopback_clear_alt(struct usb_function *f,
+ unsigned intf, unsigned alt)
{
struct f_loopback *loop = func_to_loop(f);
- disable_loopback(loop);
-
free_ep_req(loop->out_ep, loop->out_req);
usb_ep_free_request(loop->in_ep, loop->in_req);
}
@@ -437,9 +335,9 @@ static struct usb_function *loopback_alloc(struct usb_function_instance *fi)
loop->qlen = 32;
loop->function.name = "loopback";
- loop->function.bind = loopback_bind;
+ loop->function.prep_descs = loopback_prep_descs;
loop->function.set_alt = loopback_set_alt;
- loop->function.disable = loopback_disable;
+ loop->function.clear_alt = loopback_clear_alt;
loop->function.strings = loopback_strings;
loop->function.free_func = lb_free_func;
diff --git a/drivers/usb/gadget/legacy/zero.c b/drivers/usb/gadget/legacy/zero.c
index 6adfc88..781ca94 100644
--- a/drivers/usb/gadget/legacy/zero.c
+++ b/drivers/usb/gadget/legacy/zero.c
@@ -378,6 +378,9 @@ static int zero_bind(struct usb_composite_dev *cdev)
status = usb_add_function(&loopback_driver, func_lb);
if (status)
goto err_free_otg_desc;
+ status = usb_config_do_bind(&loopback_driver);
+ if (status)
+ goto err_free_otg_desc;
usb_ep_autoconfig_reset(cdev->gadget);
usb_composite_overwrite_options(cdev, &coverwrite);
--
1.9.1
--
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