static int usbhsg_recip_handler_std_get_device(struct usbhs_priv *priv,
struct usbhsg_uep *uep,
struct usb_ctrlrequest *ctrl)
{
struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
unsigned short status = 0;
if (usbhsg_status_has(gpriv, USBHSG_STATUS_SELF_POWERED))
status = 1 << USB_DEVICE_SELF_POWERED;
__usbhsg_recip_send_status(gpriv, status);
return 0;
}
static int usbhsg_recip_handler_std_get_endpoint(struct usbhs_priv *priv,
struct usbhsg_uep *uep,
struct usb_ctrlrequest *ctrl)
{
struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
unsigned short status = 0;
if (usbhs_pipe_is_stall(pipe))
status = 1 << USB_ENDPOINT_HALT;
__usbhsg_recip_send_status(gpriv, status);
return 0;
}
static int usbhsg_dma_map_ctrl(struct usbhs_pkt *pkt, int map)
{
struct usbhs_pipe *pipe = pkt->pipe;
struct usbhsg_uep *uep = usbhsg_pipe_to_uep(pipe);
struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
struct device *dev = usbhsg_gpriv_to_dev(gpriv);
enum dma_data_direction dir;
dir = usbhs_pipe_is_dir_in(pipe) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
if (map)
return usbhsg_dma_map(dev, pkt, dir);
else
return usbhsg_dma_unmap(dev, pkt, dir);
}
/*
* queue push/pop
*/
static void __usbhsg_queue_pop(struct usbhsg_uep *uep,
struct usbhsg_request *ureq,
int status)
{
struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
struct device *dev = usbhsg_gpriv_to_dev(gpriv);
struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
dev_dbg(dev, "pipe %d : queue pop\n", usbhs_pipe_number(pipe));
ureq->req.status = status;
spin_unlock(usbhs_priv_to_lock(priv));
usb_gadget_giveback_request(&uep->ep, &ureq->req);
spin_lock(usbhs_priv_to_lock(priv));
}
static int __usbhsg_queue_handler(struct usbhsg_uep *uep, int prepare)
{
struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
struct device *dev = usbhsg_gpriv_to_dev(gpriv);
struct usbhsg_request *ureq;
spinlock_t *lock;
unsigned long flags;
int ret = 0;
if (!uep->handler) {
dev_err(dev, "no handler function\n");
return -EIO;
}
/*
* CAUTION [*queue handler*]
*
* This function will be called for start/restart queue operation.
* OTOH the most much worry for USB driver is spinlock nest.
* Specially it are
* - usb_ep_ops :: queue
* - usb_request :: complete
*
* But the caller of this function need not care about spinlock.
* This function is using usbhsg_trylock for it.
* if "is_locked" is 1, this mean this function lock it.
* but if it is 0, this mean it is already under spin lock.
* see also
* CAUTION [*endpoint queue*]
* CAUTION [*request complete*]
*/
/****************** spin try lock *******************/
lock = usbhsg_trylock(gpriv, &flags);
ureq = usbhsg_queue_get(uep);
if (ureq) {
if (prepare)
ret = uep->handler->prepare(uep, ureq);
else
ret = uep->handler->try_run(uep, ureq);
}
usbhsg_unlock(lock, &flags);
/******************** spin unlock ******************/
return ret;
}
static int usbhsg_ep_queue(struct usb_ep *ep, struct usb_request *req,
gfp_t gfp_flags)
{
struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
spinlock_t *lock;
unsigned long flags;
int ret = 0;
/*
* CAUTION [*endpoint queue*]
*
* This function will be called from usb_request :: complete
* or usb driver timing.
* If this function is called from usb_request :: complete,
* it is already under spinlock on this driver.
* but it is called frm usb driver, this function should call spinlock.
*
* This function is using usbshg_trylock to solve this issue.
* if "is_locked" is 1, this mean this function lock it.
* but if it is 0, this mean it is already under spin lock.
* see also
* CAUTION [*queue handler*]
* CAUTION [*request complete*]
*/
/******************** spin lock ********************/
lock = usbhsg_trylock(gpriv, &flags);
/* param check */
if (usbhsg_is_not_connected(gpriv) ||
unlikely(!gpriv->driver) ||
unlikely(!pipe))
ret = -ESHUTDOWN;
else
usbhsg_queue_push(uep, ureq);
usbhsg_unlock(lock, &flags);
/******************** spin unlock ******************/
usbhsg_queue_prepare(uep);
return ret;
}
/*
*
* usb_ep_ops
*
*/
static int usbhsg_ep_enable(struct usb_ep *ep,
const struct usb_endpoint_descriptor *desc)
{
struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
struct usbhs_pipe *pipe;
int ret = -EIO;
/*
* if it already have pipe,
* nothing to do
*/
if (uep->pipe) {
usbhs_pipe_clear(uep->pipe);
usbhs_pipe_sequence_data0(uep->pipe);
return 0;
}
pipe = usbhs_pipe_malloc(priv,
usb_endpoint_type(desc),
usb_endpoint_dir_in(desc));
if (pipe) {
uep->pipe = pipe;
pipe->mod_private = uep;
/* set epnum / maxp */
usbhs_pipe_config_update(pipe, 0,
usb_endpoint_num(desc),
usb_endpoint_maxp(desc));
/*
* usbhs_fifo_dma_push/pop_handler try to
* use dmaengine if possible.
* It will use pio handler if impossible.
*/
if (usb_endpoint_dir_in(desc))
pipe->handler = &usbhs_fifo_dma_push_handler;
else
pipe->handler = &usbhs_fifo_dma_pop_handler;
ret = 0;
}
return ret;
}
static int usbhsg_recip_handler_std_clear_endpoint(struct usbhs_priv *priv,
struct usbhsg_uep *uep,
struct usb_ctrlrequest *ctrl)
{
struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
if (!usbhsg_status_has(gpriv, USBHSG_STATUS_WEDGE)) {
usbhs_pipe_disable(pipe);
usbhs_pipe_clear_sequence(pipe);
usbhs_pipe_enable(pipe);
}
usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
return 0;
}
/*
* queue push/pop
*/
static void usbhsg_queue_push(struct usbhsg_uep *uep,
struct usbhsg_request *ureq)
{
struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
struct device *dev = usbhsg_gpriv_to_dev(gpriv);
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
struct usbhs_pkt *pkt = usbhsg_ureq_to_pkt(ureq);
struct usb_request *req = &ureq->req;
req->actual = 0;
req->status = -EINPROGRESS;
usbhs_pkt_push(pipe, pkt, uep->handler,
req->buf, req->length, req->zero);
dev_dbg(dev, "pipe %d : queue push (%d)\n",
usbhs_pipe_number(pipe),
req->length);
}
static int usbhsg_ep_queue(struct usb_ep *ep, struct usb_request *req,
gfp_t gfp_flags)
{
struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
/* param check */
if (usbhsg_is_not_connected(gpriv) ||
unlikely(!gpriv->driver) ||
unlikely(!pipe))
return -ESHUTDOWN;
usbhsg_queue_push(uep, ureq);
return 0;
}
static int usbhsg_ep_disable(struct usb_ep *ep)
{
struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
spinlock_t *lock;
unsigned long flags;
int ret;
/******************** spin lock ********************/
lock = usbhsg_trylock(gpriv, &flags);
ret = usbhsg_pipe_disable(uep);
usbhsg_unlock(lock, &flags);
/******************** spin unlock ******************/
return ret;
}
/*
* list push/pop
*/
static void usbhsg_queue_push(struct usbhsg_uep *uep,
struct usbhsg_request *ureq)
{
struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
struct device *dev = usbhsg_gpriv_to_dev(gpriv);
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
/*
********* assume under spin lock *********
*/
list_del_init(&ureq->node);
list_add_tail(&ureq->node, &uep->list);
ureq->req.actual = 0;
ureq->req.status = -EINPROGRESS;
dev_dbg(dev, "pipe %d : queue push (%d)\n",
usbhs_pipe_number(pipe),
ureq->req.length);
}
static int __usbhsg_ep_set_halt_wedge(struct usb_ep *ep, int halt, int wedge)
{
struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
struct device *dev = usbhsg_gpriv_to_dev(gpriv);
spinlock_t *lock;
unsigned long flags;
int ret = -EAGAIN;
/*
* see
* CAUTION [*queue handler*]
* CAUTION [*endpoint queue*]
* CAUTION [*request complete*]
*/
/******************** spin lock ********************/
lock = usbhsg_trylock(gpriv, &flags);
if (!usbhsg_queue_get(uep)) {
dev_dbg(dev, "set halt %d (pipe %d)\n",
halt, usbhs_pipe_number(pipe));
if (halt)
usbhs_fifo_stall(pipe);
else
usbhs_fifo_disable(pipe);
if (halt && wedge)
usbhsg_status_set(gpriv, USBHSG_STATUS_WEDGE);
else
usbhsg_status_clr(gpriv, USBHSG_STATUS_WEDGE);
ret = 0;
}
usbhsg_unlock(lock, &flags);
/******************** spin unlock ******************/
return ret;
}
/*
*
* usb_dcp_ops
*
*/
static int usbhsg_dcp_enable(struct usbhsg_uep *uep)
{
struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
struct usbhs_pipe *pipe;
/*
********* assume under spin lock *********
*/
pipe = usbhs_dcp_malloc(priv);
if (!pipe)
return -EIO;
uep->pipe = pipe;
uep->pipe->mod_private = uep;
INIT_LIST_HEAD(&uep->list);
return 0;
}
static void usbhsg_queue_pop(struct usbhsg_uep *uep,
struct usbhsg_request *ureq,
int status)
{
struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
struct device *dev = usbhsg_gpriv_to_dev(gpriv);
/*
********* assume under spin lock *********
*/
/*
* CAUTION [*request complete*]
*
* There is a possibility not to be called in correct order
* if "complete" is called without spinlock.
*
* So, this function assume it is under spinlock,
* and call usb_request :: complete.
*
* But this "complete" will push next usb_request.
* It mean "usb_ep_ops :: queue" which is using spinlock is called
* under spinlock.
*
* To avoid dead-lock, this driver is using usbhsg_trylock.
* CAUTION [*endpoint queue*]
* CAUTION [*queue handler*]
*/
dev_dbg(dev, "pipe %d : queue pop\n", usbhs_pipe_number(pipe));
list_del_init(&ureq->node);
ureq->req.status = status;
ureq->req.complete(&uep->ep, &ureq->req);
/* more request ? */
if (0 == status)
usbhsg_queue_prepare(uep);
}
/*
*
* usb_ep_ops
*
*/
static int usbhsg_ep_enable(struct usb_ep *ep,
const struct usb_endpoint_descriptor *desc)
{
struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
struct usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
struct usbhs_pipe *pipe;
spinlock_t *lock;
unsigned long flags;
int ret = -EIO;
/*
* if it already have pipe,
* nothing to do
*/
if (uep->pipe)
return 0;
/******************** spin lock ********************/
lock = usbhsg_trylock(gpriv, &flags);
pipe = usbhs_pipe_malloc(priv, desc);
if (pipe) {
uep->pipe = pipe;
pipe->mod_private = uep;
INIT_LIST_HEAD(&uep->list);
if (usb_endpoint_dir_in(desc))
uep->handler = &usbhsg_handler_send_packet;
else
uep->handler = &usbhsg_handler_recv_packet;
ret = 0;
}
usbhsg_unlock(lock, &flags);
/******************** spin unlock ******************/
return ret;
}
static int usbhsg_try_run_send_packet(struct usbhsg_uep *uep,
struct usbhsg_request *ureq)
{
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
struct usb_request *req = &ureq->req;
struct usbhsg_gpriv *gpriv = usbhsg_uep_to_gpriv(uep);
struct device *dev = usbhsg_gpriv_to_dev(gpriv);
void *buf;
int remainder, send;
int is_done = 0;
int enable;
int maxp;
/*
********* assume under spin lock *********
*/
maxp = usbhs_pipe_get_maxpacket(pipe);
buf = req->buf + req->actual;
remainder = req->length - req->actual;
send = usbhs_fifo_write(pipe, buf, remainder);
/*
* send < 0 : pipe busy
* send = 0 : send zero packet
* send > 0 : send data
*
* send <= max_packet
*/
if (send > 0)
req->actual += send;
/* send all packet ? */
if (send < remainder)
is_done = 0; /* there are remainder data */
else if (send < maxp)
is_done = 1; /* short packet */
else
is_done = !req->zero; /* send zero packet ? */
dev_dbg(dev, " send %d (%d/ %d/ %d/ %d)\n",
usbhs_pipe_number(pipe),
remainder, send, is_done, req->zero);
/*
* enable interrupt and send again in irq handler
* if it still have remainder data which should be sent.
*/
enable = !is_done;
uep->handler->irq_mask(uep, enable);
/*
* usbhs_fifo_enable execute
* - after callback_update,
* - before queue_pop / stage_end
*/
usbhs_fifo_enable(pipe);
/*
* all data were sent ?
*/
if (is_done) {
/* it care below call in
"function mode" */
if (usbhsg_is_dcp(uep))
usbhs_dcp_control_transfer_done(pipe);
usbhsg_queue_pop(uep, ureq, 0);
}
return 0;
}
