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 usbhs_priv *priv = usbhsg_gpriv_to_priv(gpriv);
struct device *dev = usbhsg_gpriv_to_dev(gpriv);
unsigned long flags;
usbhsg_pipe_disable(uep);
dev_dbg(dev, "set halt %d (pipe %d)\n",
halt, usbhs_pipe_number(pipe));
/******************** spin lock ********************/
usbhs_lock(priv, flags);
if (halt)
usbhs_pipe_stall(pipe);
else
usbhs_pipe_disable(pipe);
if (halt && wedge)
usbhsg_status_set(gpriv, USBHSG_STATUS_WEDGE);
else
usbhsg_status_clr(gpriv, USBHSG_STATUS_WEDGE);
usbhs_unlock(priv, flags);
/******************** spin unlock ******************/
return 0;
}
static int usbhsg_pipe_disable(struct usbhsg_uep *uep)
{
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
struct usbhsg_request *ureq;
int disable = 0;
/*
********* assume under spin lock *********
*/
usbhs_fifo_disable(pipe);
/*
* disable pipe irq
*/
usbhsg_irq_empty_ctrl(uep, disable);
usbhsg_irq_ready_ctrl(uep, disable);
while (1) {
ureq = usbhsg_queue_get(uep);
if (!ureq)
break;
usbhsg_queue_pop(uep, ureq, -ECONNRESET);
}
return 0;
}
/*
* USB_TYPE handler
*/
static int usbhsg_recip_run_handle(struct usbhs_priv *priv,
struct usbhsg_recip_handle *handler,
struct usb_ctrlrequest *ctrl)
{
struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
struct device *dev = usbhsg_gpriv_to_dev(gpriv);
struct usbhsg_uep *uep;
struct usbhs_pipe *pipe;
int recip = ctrl->bRequestType & USB_RECIP_MASK;
int nth = le16_to_cpu(ctrl->wIndex) & USB_ENDPOINT_NUMBER_MASK;
int ret;
int (*func)(struct usbhs_priv *priv, struct usbhsg_uep *uep,
struct usb_ctrlrequest *ctrl);
char *msg;
uep = usbhsg_gpriv_to_nth_uep(gpriv, nth);
pipe = usbhsg_uep_to_pipe(uep);
if (!pipe) {
dev_err(dev, "wrong recip request\n");
ret = -EINVAL;
goto usbhsg_recip_run_handle_end;
}
switch (recip) {
case USB_RECIP_DEVICE:
msg = "DEVICE";
func = handler->device;
break;
case USB_RECIP_INTERFACE:
msg = "INTERFACE";
func = handler->interface;
break;
case USB_RECIP_ENDPOINT:
msg = "ENDPOINT";
func = handler->endpoint;
break;
default:
dev_warn(dev, "unsupported RECIP(%d)\n", recip);
func = NULL;
ret = -EINVAL;
}
if (func) {
unsigned long flags;
dev_dbg(dev, "%s (pipe %d :%s)\n", handler->name, nth, msg);
/******************** spin lock ********************/
usbhs_lock(priv, flags);
ret = func(priv, uep, ctrl);
usbhs_unlock(priv, flags);
/******************** spin unlock ******************/
}
usbhsg_recip_run_handle_end:
usbhs_pkt_start(pipe);
return ret;
}
static int usbhsg_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
{
struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
usbhs_pkt_pop(pipe, usbhsg_ureq_to_pkt(ureq));
usbhsg_queue_pop(uep, ureq, -ECONNRESET);
return 0;
}
/*
* USB_TYPE_STANDARD / clear feature functions
*/
static int usbhsg_recip_handler_std_control_done(struct usbhs_priv *priv,
struct usbhsg_uep *uep,
struct usb_ctrlrequest *ctrl)
{
struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
usbhs_dcp_control_transfer_done(pipe);
return 0;
}
static int usbhsg_recip_handler_std_set_endpoint(struct usbhs_priv *priv,
struct usbhsg_uep *uep,
struct usb_ctrlrequest *ctrl)
{
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
usbhs_pipe_stall(pipe);
usbhsg_recip_handler_std_control_done(priv, uep, ctrl);
return 0;
}
static int usbhsg_try_run_receive_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 maxp;
int remainder, recv;
int is_done = 0;
/*
********* assume under spin lock *********
*/
maxp = usbhs_pipe_get_maxpacket(pipe);
buf = req->buf + req->actual;
remainder = req->length - req->actual;
recv = usbhs_fifo_read(pipe, buf, remainder);
/*
* recv < 0 : pipe busy
* recv >= 0 : receive data
*
* recv <= max_packet
*/
if (recv < 0)
return -EBUSY;
/* update parameters */
req->actual += recv;
if ((recv == remainder) || /* receive all data */
(recv < maxp)) /* short packet */
is_done = 1;
dev_dbg(dev, " recv %d (%d/ %d/ %d/ %d)\n",
usbhs_pipe_number(pipe),
remainder, recv, is_done, req->zero);
/* read all data ? */
if (is_done) {
int disable = 0;
uep->handler->irq_mask(uep, disable);
usbhs_fifo_disable(pipe);
usbhsg_queue_pop(uep, ureq, 0);
}
return 0;
}
/*
* 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);
dev_dbg(dev, "pipe %d : queue pop\n", usbhs_pipe_number(pipe));
ureq->req.status = status;
usb_gadget_giveback_request(&uep->ep, &ureq->req);
}
static int usbhsg_prepare_send_packet(struct usbhsg_uep *uep,
struct usbhsg_request *ureq)
{
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
/*
********* assume under spin lock *********
*/
usbhs_fifo_prepare_write(pipe);
usbhsg_try_run_send_packet(uep, ureq);
return 0;
}
/*
* handler function
*/
static int usbhsg_try_run_ctrl_stage_end(struct usbhsg_uep *uep,
struct usbhsg_request *ureq)
{
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
/*
********* assume under spin lock *********
*/
usbhs_dcp_control_transfer_done(pipe);
usbhsg_queue_pop(uep, ureq, 0);
return 0;
}
/*
*
* usb_dcp_ops
*
*/
static int usbhsg_pipe_disable(struct usbhsg_uep *uep)
{
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
struct usbhs_pkt *pkt;
usbhs_pipe_disable(pipe);
while (1) {
pkt = usbhs_pkt_pop(pipe, NULL);
if (!pkt)
break;
}
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_ep_disable(struct usb_ep *ep)
{
struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
if (!pipe)
return -EINVAL;
usbhsg_pipe_disable(uep);
usbhs_pipe_free(pipe);
uep->pipe->mod_private = NULL;
uep->pipe = NULL;
return 0;
}
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;
}
/*
*
* usb_dcp_ops
*
*/
static int usbhsg_pipe_disable(struct usbhsg_uep *uep)
{
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
struct usbhs_pkt *pkt;
while (1) {
pkt = usbhs_pkt_pop(pipe, NULL);
if (!pkt)
break;
usbhsg_queue_pop(uep, usbhsg_pkt_to_ureq(pkt), -ECONNRESET);
}
usbhs_pipe_disable(pipe);
return 0;
}
static int usbhsg_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
{
struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
if (pipe)
usbhs_pkt_pop(pipe, usbhsg_ureq_to_pkt(ureq));
/*
* To dequeue a request, this driver should call the usbhsg_queue_pop()
* even if the pipe is NULL.
*/
usbhsg_queue_pop(uep, ureq, -ECONNRESET);
return 0;
}
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;
}
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;
}
/*
* 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);
}
/*
* 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;
}
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);
}
static int usbhsg_ep_dequeue(struct usb_ep *ep, struct usb_request *req)
{
struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
struct usbhsg_request *ureq = usbhsg_req_to_ureq(req);
struct usbhs_pipe *pipe;
unsigned long flags;
spin_lock_irqsave(&uep->lock, flags);
pipe = usbhsg_uep_to_pipe(uep);
if (pipe)
usbhs_pkt_pop(pipe, usbhsg_ureq_to_pkt(ureq));
/*
* To dequeue a request, this driver should call the usbhsg_queue_pop()
* even if the pipe is NULL.
*/
usbhsg_queue_pop(uep, ureq, -ECONNRESET);
spin_unlock_irqrestore(&uep->lock, flags);
return 0;
}
static int usbhsg_ep_disable(struct usb_ep *ep)
{
struct usbhsg_uep *uep = usbhsg_ep_to_uep(ep);
struct usbhs_pipe *pipe;
unsigned long flags;
spin_lock_irqsave(&uep->lock, flags);
pipe = usbhsg_uep_to_pipe(uep);
if (!pipe)
goto out;
usbhsg_pipe_disable(uep);
usbhs_pipe_free(pipe);
uep->pipe->mod_private = NULL;
uep->pipe = NULL;
out:
spin_unlock_irqrestore(&uep->lock, flags);
return 0;
}
static int usbhsg_prepare_receive_packet(struct usbhsg_uep *uep,
struct usbhsg_request *ureq)
{
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(uep);
int enable = 1;
int ret;
/*
********* assume under spin lock *********
*/
ret = usbhs_fifo_prepare_read(pipe);
if (ret < 0)
return ret;
/*
* data will be read in interrupt handler
*/
uep->handler->irq_mask(uep, enable);
return ret;
}
static void __usbhsg_recip_send_status(struct usbhsg_gpriv *gpriv,
unsigned short status)
{
struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
struct device *dev = usbhsg_gpriv_to_dev(gpriv);
struct usb_request *req;
unsigned short *buf;
/* alloc new usb_request for recip */
req = usb_ep_alloc_request(&dcp->ep, GFP_ATOMIC);
if (!req) {
dev_err(dev, "recip request allocation fail\n");
return;
}
/* alloc recip data buffer */
buf = kmalloc(sizeof(*buf), GFP_ATOMIC);
if (!buf) {
usb_ep_free_request(&dcp->ep, req);
dev_err(dev, "recip data allocation fail\n");
return;
}
/* recip data is status */
*buf = cpu_to_le16(status);
/* allocated usb_request/buffer will be freed */
req->complete = __usbhsg_recip_send_complete;
req->buf = buf;
req->length = sizeof(*buf);
req->zero = 0;
/* push packet */
pipe->handler = &usbhs_fifo_pio_push_handler;
usbhsg_queue_push(dcp, usbhsg_req_to_ureq(req));
}
static int usbhsg_irq_ctrl_stage(struct usbhs_priv *priv,
struct usbhs_irq_state *irq_state)
{
struct usbhsg_gpriv *gpriv = usbhsg_priv_to_gpriv(priv);
struct usbhsg_uep *dcp = usbhsg_gpriv_to_dcp(gpriv);
struct usbhs_pipe *pipe = usbhsg_uep_to_pipe(dcp);
struct device *dev = usbhsg_gpriv_to_dev(gpriv);
struct usb_ctrlrequest ctrl;
struct usbhsg_recip_handle *recip_handler = NULL;
int stage = usbhs_status_get_ctrl_stage(irq_state);
int ret = 0;
dev_dbg(dev, "stage = %d\n", stage);
/*
* see Manual
*
* "Operation"
* - "Interrupt Function"
* - "Control Transfer Stage Transition Interrupt"
* - Fig. "Control Transfer Stage Transitions"
*/
switch (stage) {
case READ_DATA_STAGE:
dcp->handler = &usbhsg_handler_send_ctrl;
break;
case WRITE_DATA_STAGE:
dcp->handler = &usbhsg_handler_recv_ctrl;
break;
case NODATA_STATUS_STAGE:
dcp->handler = &usbhsg_handler_ctrl_stage_end;
break;
default:
return ret;
}
/*
* get usb request
*/
usbhs_usbreq_get_val(priv, &ctrl);
switch (ctrl.bRequestType & USB_TYPE_MASK) {
case USB_TYPE_STANDARD:
switch (ctrl.bRequest) {
case USB_REQ_CLEAR_FEATURE:
recip_handler = &req_clear_feature;
break;
}
}
/*
* setup stage / run recip
*/
if (recip_handler)
ret = usbhsg_recip_run_handle(priv, recip_handler, &ctrl);
else
ret = gpriv->driver->setup(&gpriv->gadget, &ctrl);
if (ret < 0)
usbhs_fifo_stall(pipe);
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;
}
