From: Pratyush Anand <pratyush.anand@xxxxxx>
This patch is based on patch "usb: gadget: add isochronous support to
gadget zero" from Paul Zimmerman.
Above patch adds one more interface with Alternate Setting '1'. Now, if
get_alt is not defined then, composite driver always returns alternate
setting '0'. So, implemented get_alt to return correct alternate
settings.
Signed-off-by: Pratyush Anand <pratyush.anand@xxxxxx>
Signed-off-by: Paul Zimmerman <paulz@xxxxxxxxxxxx>
---
drivers/usb/gadget/f_sourcesink.c | 11 +++++++++++
1 files changed, 11 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/gadget/f_sourcesink.c b/drivers/usb/gadget/f_sourcesink.c
index 911e6f3..5c1b68b 100644
--- a/drivers/usb/gadget/f_sourcesink.c
+++ b/drivers/usb/gadget/f_sourcesink.c
@@ -53,6 +53,7 @@ struct f_sourcesink {
struct usb_ep *out_ep;
struct usb_ep *iso_in_ep;
struct usb_ep *iso_out_ep;
+ int cur_alt;
};
static inline struct f_sourcesink *func_to_ss(struct usb_function *f)
@@ -729,6 +730,8 @@ fail3:
}
}
out:
+ ss->cur_alt = alt;
+
DBG(cdev, "%s enabled, alt intf %d\n", ss->function.name, alt);
return result;
}
@@ -744,6 +747,13 @@ static int sourcesink_set_alt(struct usb_function *f,
return enable_source_sink(cdev, ss, alt);
}
+static int sourcesink_get_alt(struct usb_function *f, unsigned intf)
+{
+ struct f_sourcesink *ss = func_to_ss(f);
+
+ return ss->cur_alt;
+}
+
static void sourcesink_disable(struct usb_function *f)
{
struct f_sourcesink *ss = func_to_ss(f);
@@ -767,6 +777,7 @@ static int __init sourcesink_bind_config(struct usb_configuration *c)
ss->function.bind = sourcesink_bind;
ss->function.unbind = sourcesink_unbind;
ss->function.set_alt = sourcesink_set_alt;
+ ss->function.get_alt = sourcesink_get_alt;
ss->function.disable = sourcesink_disable;
status = usb_add_function(c, &ss->function);
--
1.7.1
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