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USB: f_rmnet: Drop DTR on host suspend

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Some Windows hosts are not dropping DTR during suspend, but are
setting DTR as part of resume. Hence, send DTR set to zero to
the Modem when the rmnet interface is suspended.

Change-Id: I9137021e2c4074c71e9142e7dbac2042311b3c4d
Signed-off-by: Chiranjeevi Velempati <cvelempa@codeaurora.org>
This commit is contained in:
Chiranjeevi Velempati
2012-01-24 09:54:11 +05:30
parent 395db38b30
commit e007beddca
1 changed files with 18 additions and 0 deletions
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18
drivers/usb/gadget/f_rmnet.c
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@@ -426,6 +426,23 @@ static void frmnet_unbind(struct usb_configuration *c, struct usb_function *f)
kfree(f->name);
}
static void frmnet_suspend(struct usb_function *f)
{
struct f_rmnet *dev = func_to_rmnet(f);
unsigned port_num;
if (!atomic_read(&dev->online))
return;
/* This is a workaround for a bug in Windows 7/XP hosts in which
* the DTR bit is not set low when going into suspend. Hence force it
* low here when this function driver is suspended.
*/
if (dev->port.notify_modem) {
port_num = rmnet_ports[dev->port_num].ctrl_xport_num;
dev->port.notify_modem(&dev->port, port_num, ~ACM_CTRL_DTR);
}
}
static void frmnet_disable(struct usb_function *f)
{
struct f_rmnet *dev = func_to_rmnet(f);
@@ -937,6 +954,7 @@ static int frmnet_bind_config(struct usb_configuration *c, unsigned portno)
f->disable = frmnet_disable;
f->set_alt = frmnet_set_alt;
f->setup = frmnet_setup;
f->suspend = frmnet_suspend;
dev->port.send_cpkt_response = frmnet_send_cpkt_response;
dev->port.disconnect = frmnet_disconnect;
dev->port.connect = frmnet_connect;