/*
* This is called when the USB service is started or resumed for a PD.
* Context: softirq
*/
int oz_usb_start(struct oz_pd *pd, int resume)
{
int rc = 0;
struct oz_usb_ctx *usb_ctx;
struct oz_usb_ctx *old_ctx;
if (resume) {
oz_dbg(ON, "USB service resumed\n");
return 0;
}
oz_dbg(ON, "USB service started\n");
/* Create a USB context in case we need one. If we find the PD already
* has a USB context then we will destroy it.
*/
usb_ctx = kzalloc(sizeof(struct oz_usb_ctx), GFP_ATOMIC);
if (usb_ctx == NULL)
return -ENOMEM;
atomic_set(&usb_ctx->ref_count, 1);
usb_ctx->pd = pd;
usb_ctx->stopped = 0;
/* Install the USB context if the PD doesn't already have one.
* If it does already have one then destroy the one we have just
* created.
*/
spin_lock_bh(&pd->app_lock[OZ_APPID_USB-1]);
old_ctx = pd->app_ctx[OZ_APPID_USB-1];
if (old_ctx == NULL)
pd->app_ctx[OZ_APPID_USB-1] = usb_ctx;
oz_usb_get(pd->app_ctx[OZ_APPID_USB-1]);
spin_unlock_bh(&pd->app_lock[OZ_APPID_USB-1]);
if (old_ctx) {
oz_dbg(ON, "Already have USB context\n");
kfree(usb_ctx);
usb_ctx = old_ctx;
} else if (usb_ctx) {
/* Take a reference to the PD. This will be released when
* the USB context is destroyed.
*/
oz_pd_get(pd);
}
/* If we already had a USB context and had obtained a port from
* the USB HCD then just reset the port. If we didn't have a port
* then report the arrival to the USB HCD so we get one.
*/
if (usb_ctx->hport) {
oz_hcd_pd_reset(usb_ctx, usb_ctx->hport);
} else {
usb_ctx->hport = oz_hcd_pd_arrived(usb_ctx);
if (usb_ctx->hport == NULL) {
oz_dbg(ON, "USB hub returned null port\n");
spin_lock_bh(&pd->app_lock[OZ_APPID_USB-1]);
pd->app_ctx[OZ_APPID_USB-1] = NULL;
spin_unlock_bh(&pd->app_lock[OZ_APPID_USB-1]);
oz_usb_put(usb_ctx);
rc = -1;
}
}
oz_usb_put(usb_ctx);
return rc;
}
/*
* This decrements the reference count of the context area for a specific PD
* and destroys the context area if the reference count becomes zero.
* Context: irq or process
*/
void oz_usb_put(void *hpd)
{
struct oz_usb_ctx *usb_ctx = (struct oz_usb_ctx *)hpd;
if (atomic_dec_and_test(&usb_ctx->ref_count)) {
oz_dbg(ON, "Dealloc USB context\n");
oz_pd_put(usb_ctx->pd);
kfree(usb_ctx);
}
}
/*
* Context: softirq or process
*/
void oz_pd_stop(struct oz_pd *pd)
{
u16 stop_apps;
oz_dbg(ON, "oz_pd_stop() State = 0x%x\n", pd->state);
oz_pd_indicate_farewells(pd);
oz_polling_lock_bh();
stop_apps = pd->total_apps;
pd->total_apps = 0;
pd->paused_apps = 0;
oz_polling_unlock_bh();
oz_services_stop(pd, stop_apps, 0);
oz_polling_lock_bh();
oz_pd_set_state(pd, OZ_PD_S_STOPPED);
/* Remove from PD list.*/
list_del(&pd->link);
oz_polling_unlock_bh();
oz_dbg(ON, "pd ref count = %d\n", atomic_read(&pd->ref_count));
oz_pd_put(pd);
}
/*
* Context: softirq
*/
int oz_usb_get_desc_req(void *hpd, u8 req_id, u8 req_type, u8 desc_type,
u8 index, u16 windex, int offset, int len)
{
struct oz_usb_ctx *usb_ctx = (struct oz_usb_ctx *)hpd;
struct oz_pd *pd = usb_ctx->pd;
struct oz_elt *elt;
struct oz_get_desc_req *body;
struct oz_elt_buf *eb = &pd->elt_buff;
struct oz_elt_info *ei = oz_elt_info_alloc(&pd->elt_buff);
oz_dbg(ON, " req_type = 0x%x\n", req_type);
oz_dbg(ON, " desc_type = 0x%x\n", desc_type);
oz_dbg(ON, " index = 0x%x\n", index);
oz_dbg(ON, " windex = 0x%x\n", windex);
oz_dbg(ON, " offset = 0x%x\n", offset);
oz_dbg(ON, " len = 0x%x\n", len);
if (len > 200)
len = 200;
if (ei == NULL)
return -1;
elt = (struct oz_elt *)ei->data;
elt->length = sizeof(struct oz_get_desc_req);
body = (struct oz_get_desc_req *)(elt+1);
body->type = OZ_GET_DESC_REQ;
body->req_id = req_id;
put_unaligned(cpu_to_le16(offset), &body->offset);
put_unaligned(cpu_to_le16(len), &body->size);
body->req_type = req_type;
body->desc_type = desc_type;
body->w_index = windex;
body->index = index;
return oz_usb_submit_elt(eb, ei, usb_ctx, 0, 0);
}
/*
* Context: softirq or process
*/
struct oz_elt_info *oz_elt_info_alloc(struct oz_elt_buf *buf)
{
struct oz_elt_info *ei;
spin_lock_bh(&buf->lock);
if (buf->free_elts && buf->elt_pool) {
ei = container_of(buf->elt_pool, struct oz_elt_info, link);
buf->elt_pool = ei->link.next;
buf->free_elts--;
spin_unlock_bh(&buf->lock);
if (ei->magic != OZ_ELT_INFO_MAGIC_FREE) {
oz_dbg(ON, "%s: ei with bad magic: 0x%x\n",
__func__, ei->magic);
}
} else {
/*
* This is called when the USB service is stopped or paused for a PD.
* Context: softirq or process
*/
void oz_usb_stop(struct oz_pd *pd, int pause)
{
struct oz_usb_ctx *usb_ctx;
if (pause) {
oz_dbg(ON, "USB service paused\n");
return;
}
spin_lock_bh(&pd->app_lock[OZ_APPID_USB-1]);
usb_ctx = (struct oz_usb_ctx *)pd->app_ctx[OZ_APPID_USB-1];
pd->app_ctx[OZ_APPID_USB-1] = NULL;
spin_unlock_bh(&pd->app_lock[OZ_APPID_USB-1]);
if (usb_ctx) {
struct timespec ts, now;
getnstimeofday(&ts);
oz_dbg(ON, "USB service stopping...\n");
usb_ctx->stopped = 1;
/* At this point the reference count on the usb context should
* be 2 - one from when we created it and one from the hcd
* which claims a reference. Since stopped = 1 no one else
* should get in but someone may already be in. So wait
* until they leave but timeout after 1 second.
*/
while ((atomic_read(&usb_ctx->ref_count) > 2)) {
getnstimeofday(&now);
/*Approx 1 Sec. this is not perfect calculation*/
if (now.tv_sec != ts.tv_sec)
break;
}
oz_dbg(ON, "USB service stopped\n");
oz_hcd_pd_departed(usb_ctx->hport);
/* Release the reference taken in oz_usb_start.
*/
oz_usb_put(usb_ctx);
}
}
/*
* Context: softirq
*/
int oz_usb_stream_create(void *hpd, u8 ep_num)
{
struct oz_usb_ctx *usb_ctx = (struct oz_usb_ctx *)hpd;
struct oz_pd *pd = usb_ctx->pd;
oz_dbg(ON, "%s: (0x%x)\n", __func__, ep_num);
if (pd->mode & OZ_F_ISOC_NO_ELTS) {
oz_isoc_stream_create(pd, ep_num);
} else {
oz_pd_get(pd);
if (oz_elt_stream_create(&pd->elt_buff, ep_num,
4*pd->max_tx_size)) {
oz_pd_put(pd);
return -1;
}
}
return 0;
}
/*
* Context: softirq
*/
int oz_usb_stream_delete(void *hpd, u8 ep_num)
{
struct oz_usb_ctx *usb_ctx = (struct oz_usb_ctx *)hpd;
if (usb_ctx) {
struct oz_pd *pd = usb_ctx->pd;
if (pd) {
oz_dbg(ON, "%s: (0x%x)\n", __func__, ep_num);
if (pd->mode & OZ_F_ISOC_NO_ELTS) {
oz_isoc_stream_delete(pd, ep_num);
} else {
if (oz_elt_stream_delete(&pd->elt_buff, ep_num))
return -1;
oz_pd_put(pd);
}
}
}
return 0;
}
