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greybus: es2: add support for greybus cport flags 

Add support for Greybus CPort flags that are sent to the bridge through
a new USB vendor request when enabling a CPort as part of connection
establishment.

Currently the Greybus control and high-priority connection flags are
recognised and forwarded to APBA.

Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Johan Hovold 2016-06-22 11:42:05 +02:00 committed by Greg Kroah-Hartman
parent 3094f94773
commit 74ec7598b5
2 changed files with 52 additions and 0 deletions
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42
drivers/staging/greybus/es2.c
View File

@ -607,6 +607,47 @@ static void es2_cport_release(struct gb_host_device *hd, u16 cport_id)
ida_simple_remove(&hd->cport_id_map, cport_id);
}
static int cport_enable(struct gb_host_device *hd, u16 cport_id,
unsigned long flags)
{
struct es2_ap_dev *es2 = hd_to_es2(hd);
struct usb_device *udev = es2->usb_dev;
struct gb_apb_request_cport_flags *req;
int ret;
req = kzalloc(sizeof(*req), GFP_KERNEL);
if (!req)
return -ENOMEM;
if (flags & GB_CONNECTION_FLAG_CONTROL)
req->flags |= GB_APB_CPORT_FLAG_CONTROL;
if (flags & GB_CONNECTION_FLAG_HIGH_PRIO)
req->flags |= GB_APB_CPORT_FLAG_HIGH_PRIO;
dev_dbg(&hd->dev, "%s - cport = %u, flags = %02x\n", __func__,
cport_id, req->flags);
ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
GB_APB_REQUEST_CPORT_FLAGS,
USB_DIR_OUT | USB_TYPE_VENDOR |
USB_RECIP_INTERFACE, cport_id, 0,
req, sizeof(*req), ES2_TIMEOUT);
if (ret != sizeof(*req)) {
dev_err(&udev->dev, "failed to set cport flags for port %d\n",
cport_id);
if (ret >= 0)
ret = -EIO;
goto out;
}
ret = 0;
out:
kfree(req);
return ret;
}
static int cport_disable(struct gb_host_device *hd, u16 cport_id)
{
int retval;
@ -799,6 +840,7 @@ static struct gb_hd_driver es2_driver = {
.message_cancel = message_cancel,
.cport_allocate = es2_cport_allocate,
.cport_release = es2_cport_release,
.cport_enable = cport_enable,
.cport_disable = cport_disable,
.latency_tag_enable = latency_tag_enable,
.latency_tag_disable = latency_tag_disable,

10
drivers/staging/greybus/greybus_protocols.h
View File

@ -225,6 +225,16 @@ struct gb_control_timesync_get_last_event_response {
#define REQUEST_TIMESYNC_AUTHORITATIVE 0x0f
#define REQUEST_TIMESYNC_GET_LAST_EVENT 0x10
/* requests to set Greybus CPort flags */
#define GB_APB_REQUEST_CPORT_FLAGS 0x11
struct gb_apb_request_cport_flags {
u32 flags;
#define GB_APB_CPORT_FLAG_CONTROL 0x01
#define GB_APB_CPORT_FLAG_HIGH_PRIO 0x02
} __packed;
/* Firmware Download Protocol */
/* Request Types */