+++ /dev/null
-/* -----------------------------------------------------------------------------
- * Copyright (c) 2011 Ozmo Inc
- * Released under the GNU General Public License Version 2 (GPLv2).
- *
- * This file provides protocol independent part of the implementation of the USB
- * service for a PD.
- * The implementation of this service is split into two parts the first of which
- * is protocol independent and the second contains protocol specific details.
- * This split is to allow alternative protocols to be defined.
- * The implementation of this service uses ozhcd.c to implement a USB HCD.
- * -----------------------------------------------------------------------------
- */
-
-#include <linux/module.h>
-#include <linux/timer.h>
-#include <linux/sched.h>
-#include <linux/netdevice.h>
-#include <linux/errno.h>
-#include <linux/input.h>
-#include <asm/unaligned.h>
-#include "ozdbg.h"
-#include "ozprotocol.h"
-#include "ozeltbuf.h"
-#include "ozpd.h"
-#include "ozproto.h"
-#include "ozusbif.h"
-#include "ozhcd.h"
-#include "ozusbsvc.h"
-
-/*
- * This is called once when the driver is loaded to initialise the USB service.
- * Context: process
- */
-int oz_usb_init(void)
-{
- return oz_hcd_init();
-}
-
-/*
- * This is called once when the driver is unloaded to terminate the USB service.
- * Context: process
- */
-void oz_usb_term(void)
-{
- oz_hcd_term();
-}
-
-/*
- * 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]);
- old_ctx = pd->app_ctx[OZ_APPID_USB];
- if (old_ctx == NULL)
- pd->app_ctx[OZ_APPID_USB] = usb_ctx;
- oz_usb_get(pd->app_ctx[OZ_APPID_USB]);
- spin_unlock_bh(&pd->app_lock[OZ_APPID_USB]);
- 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]);
- pd->app_ctx[OZ_APPID_USB] = NULL;
- spin_unlock_bh(&pd->app_lock[OZ_APPID_USB]);
- oz_usb_put(usb_ctx);
- rc = -1;
- }
- }
- oz_usb_put(usb_ctx);
- return rc;
-}
-
-/*
- * 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]);
- usb_ctx = (struct oz_usb_ctx *) pd->app_ctx[OZ_APPID_USB];
- pd->app_ctx[OZ_APPID_USB] = NULL;
- spin_unlock_bh(&pd->app_lock[OZ_APPID_USB]);
- 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);
- }
-}
-
-/*
- * This increments the reference count of the context area for a specific PD.
- * This ensures this context area does not disappear while still in use.
- * Context: softirq
- */
-void oz_usb_get(void *hpd)
-{
- struct oz_usb_ctx *usb_ctx = (struct oz_usb_ctx *)hpd;
-
- atomic_inc(&usb_ctx->ref_count);
-}
-
-/*
- * 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
- */
-int oz_usb_heartbeat(struct oz_pd *pd)
-{
- struct oz_usb_ctx *usb_ctx;
- int rc = 0;
-
- spin_lock_bh(&pd->app_lock[OZ_APPID_USB]);
- usb_ctx = (struct oz_usb_ctx *) pd->app_ctx[OZ_APPID_USB];
- if (usb_ctx)
- oz_usb_get(usb_ctx);
- spin_unlock_bh(&pd->app_lock[OZ_APPID_USB]);
- if (usb_ctx == NULL)
- return rc;
- if (usb_ctx->stopped)
- goto done;
- if (usb_ctx->hport)
- if (oz_hcd_heartbeat(usb_ctx->hport))
- rc = 1;
-done:
- oz_usb_put(usb_ctx);
- return rc;
-}
-
-/*
- * 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;
-}
-
-/*
- * Context: softirq or process
- */
-void oz_usb_request_heartbeat(void *hpd)
-{
- struct oz_usb_ctx *usb_ctx = (struct oz_usb_ctx *)hpd;
-
- if (usb_ctx && usb_ctx->pd)
- oz_pd_request_heartbeat(usb_ctx->pd);
-}
Code Review / kvmfornfv.git / blobdiff