// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* some helper function for simple DVB cards which simply DMA the
* complete transport stream and let the computer sort everything else
* (i.e. we are using the software demux, ...). Also uses vb2
* to manage DMA buffers.
*
* (c) 2004 Gerd Knorr <[email protected]> [SUSE Labs]
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <media/videobuf2-dvb.h>
/* ------------------------------------------------------------------ */
MODULE_AUTHOR("Gerd Knorr <[email protected]> [SuSE Labs]");
MODULE_DESCRIPTION("Videobuf2 helper library for simple DVB cards");
MODULE_LICENSE("GPL");
/* ------------------------------------------------------------------ */
static int dvb_fnc(struct vb2_buffer *vb, void *priv)
{
struct vb2_dvb *dvb = priv;
dvb_dmx_swfilter(&dvb->demux, vb2_plane_vaddr(vb, 0),
vb2_get_plane_payload(vb, 0));
return 0;
}
static int vb2_dvb_start_feed(struct dvb_demux_feed *feed)
{
struct dvb_demux *demux = feed->demux;
struct vb2_dvb *dvb = demux->priv;
int rc = 0;
if (!demux->dmx.frontend)
return -EINVAL;
mutex_lock(&dvb->lock);
dvb->nfeeds++;
if (!dvb->dvbq.threadio) {
rc = vb2_thread_start(&dvb->dvbq, dvb_fnc, dvb, dvb->name);
if (rc)
dvb->nfeeds--;
}
if (!rc)
rc = dvb->nfeeds;
mutex_unlock(&dvb->lock);
return rc;
}
static int vb2_dvb_stop_feed(struct dvb_demux_feed *feed)
{
struct dvb_demux *demux = feed->demux;
struct vb2_dvb *dvb = demux->priv;
int err = 0;
mutex_lock(&dvb->lock);
dvb->nfeeds--;
if (0 == dvb->nfeeds)
err = vb2_thread_stop(&dvb->dvbq);
mutex_unlock(&dvb->lock);
return err;
}
static int vb2_dvb_register_adapter(struct vb2_dvb_frontends *fe,
struct module *module,
void *adapter_priv,
struct device *device,
struct media_device *mdev,
char *adapter_name,
short *adapter_nr,
int mfe_shared)
{
int result;
mutex_init(&fe->lock);
/* register adapter */
result = dvb_register_adapter(&fe->adapter, adapter_name, module,
device, adapter_nr);
if (result < 0) {
pr_warn("%s: dvb_register_adapter failed (errno = %d)\n",
adapter_name, result);
}
fe->adapter.priv = adapter_priv;
fe->adapter.mfe_shared = mfe_shared;
#ifdef CONFIG_MEDIA_CONTROLLER_DVB
if (mdev)
fe->adapter.mdev = mdev;
#endif
return result;
}
static int vb2_dvb_register_frontend(struct dvb_adapter *adapter,
struct vb2_dvb *dvb)
{
int result;
/* register frontend */
result = dvb_register_frontend(adapter, dvb->frontend);
if (result < 0) {
pr_warn("%s: dvb_register_frontend failed (errno = %d)\n",
dvb->name, result);
goto fail_frontend;
}
/* register demux stuff */
dvb->demux.dmx.capabilities =
DMX_TS_FILTERING | DMX_SECTION_FILTERING |
DMX_MEMORY_BASED_FILTERING;
dvb->demux.priv = dvb;
dvb->demux.filternum = 256;
dvb->demux.feednum = 256;
dvb->demux.start_feed = vb2_dvb_start_feed;
dvb->demux.stop_feed = vb2_dvb_stop_feed;
result = dvb_dmx_init(&dvb->demux);
if (result < 0) {
pr_warn("%s: dvb_dmx_init failed (errno = %d)\n",
dvb->name, result);
goto fail_dmx;
}
dvb->dmxdev.filternum = 256;
dvb->dmxdev.demux = &dvb->demux.dmx;
dvb->dmxdev.capabilities = 0;
result = dvb_dmxdev_init(&dvb->dmxdev, adapter);
if (result < 0) {
pr_warn("%s: dvb_dmxdev_init failed (errno = %d)\n",
dvb->name, result);
goto fail_dmxdev;
}
dvb->fe_hw.source = DMX_FRONTEND_0;
result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);
if (result < 0) {
pr_warn("%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",
dvb->name, result);
goto fail_fe_hw;
}
dvb->fe_mem.source = DMX_MEMORY_FE;
result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);
if (result < 0) {
pr_warn("%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",
dvb->name, result);
goto fail_fe_mem;
}
result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);
if (result < 0) {
pr_warn("%s: connect_frontend failed (errno = %d)\n",
dvb->name, result);
goto fail_fe_conn;
}
/* register network adapter */
result = dvb_net_init(adapter, &dvb->net, &dvb->demux.dmx);
if (result < 0) {
pr_warn("%s: dvb_net_init failed (errno = %d)\n",
dvb->name, result);
goto fail_fe_conn;
}
return 0;
fail_fe_conn:
dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);
fail_fe_mem:
dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);
fail_fe_hw:
dvb_dmxdev_release(&dvb->dmxdev);
fail_dmxdev:
dvb_dmx_release(&dvb->demux);
fail_dmx:
dvb_unregister_frontend(dvb->frontend);
fail_frontend:
dvb_frontend_detach(dvb->frontend);
dvb->frontend = NULL;
return result;
}
/* ------------------------------------------------------------------ */
/* Register a single adapter and one or more frontends */
int vb2_dvb_register_bus(struct vb2_dvb_frontends *f,
struct module *module,
void *adapter_priv,
struct device *device,
struct media_device *mdev,
short *adapter_nr,
int mfe_shared)
{
struct list_head *list, *q;
struct vb2_dvb_frontend *fe;
int res;
fe = vb2_dvb_get_frontend(f, 1);
if (!fe) {
pr_warn("Unable to register the adapter which has no frontends\n");
return -EINVAL;
}
/* Bring up the adapter */
res = vb2_dvb_register_adapter(f, module, adapter_priv, device, mdev,
fe->dvb.name, adapter_nr, mfe_shared);
if (res < 0) {
pr_warn("vb2_dvb_register_adapter failed (errno = %d)\n", res);
return res;
}
/* Attach all of the frontends to the adapter */
mutex_lock(&f->lock);
list_for_each_safe(list, q, &f->felist) {
fe = list_entry(list, struct vb2_dvb_frontend, felist);
res = vb2_dvb_register_frontend(&f->adapter, &fe->dvb);
if (res < 0) {
pr_warn("%s: vb2_dvb_register_frontend failed (errno = %d)\n",
fe->dvb.name, res);
goto err;
}
res = dvb_create_media_graph(&f->adapter, false);
if (res < 0)
goto err;
}
mutex_unlock(&f->lock);
return 0;
err:
mutex_unlock(&f->lock);
vb2_dvb_unregister_bus(f);
return res;
}
EXPORT_SYMBOL(vb2_dvb_register_bus);
void vb2_dvb_unregister_bus(struct vb2_dvb_frontends *f)
{
vb2_dvb_dealloc_frontends(f);
dvb_unregister_adapter(&f->adapter);
}
EXPORT_SYMBOL(vb2_dvb_unregister_bus);
struct vb2_dvb_frontend *vb2_dvb_get_frontend(
struct vb2_dvb_frontends *f, int id)
{
struct list_head *list, *q;
struct vb2_dvb_frontend *fe, *ret = NULL;
mutex_lock(&f->lock);
list_for_each_safe(list, q, &f->felist) {
fe = list_entry(list, struct vb2_dvb_frontend, felist);
if (fe->id == id) {
ret = fe;
break;
}
}
mutex_unlock(&f->lock);
return ret;
}
EXPORT_SYMBOL(vb2_dvb_get_frontend);
int vb2_dvb_find_frontend(struct vb2_dvb_frontends *f,
struct dvb_frontend *p)
{
struct list_head *list, *q;
struct vb2_dvb_frontend *fe = NULL;
int ret = 0;
mutex_lock(&f->lock);
list_for_each_safe(list, q, &f->felist) {
fe = list_entry(list, struct vb2_dvb_frontend, felist);
if (fe->dvb.frontend == p) {
ret = fe->id;
break;
}
}
mutex_unlock(&f->lock);
return ret;
}
EXPORT_SYMBOL(vb2_dvb_find_frontend);
struct vb2_dvb_frontend *vb2_dvb_alloc_frontend(
struct vb2_dvb_frontends *f, int id)
{
struct vb2_dvb_frontend *fe;
fe = kzalloc(sizeof(struct vb2_dvb_frontend), GFP_KERNEL);
if (fe == NULL)
return NULL;
fe->id = id;
mutex_init(&fe->dvb.lock);
mutex_lock(&f->lock);
list_add_tail(&fe->felist, &f->felist);
mutex_unlock(&f->lock);
return fe;
}
EXPORT_SYMBOL(vb2_dvb_alloc_frontend);
void vb2_dvb_dealloc_frontends(struct vb2_dvb_frontends *f)
{
struct list_head *list, *q;
struct vb2_dvb_frontend *fe;
mutex_lock(&f->lock);
list_for_each_safe(list, q, &f->felist) {
fe = list_entry(list, struct vb2_dvb_frontend, felist);
if (fe->dvb.net.dvbdev) {
dvb_net_release(&fe->dvb.net);
fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
&fe->dvb.fe_mem);
fe->dvb.demux.dmx.remove_frontend(&fe->dvb.demux.dmx,
&fe->dvb.fe_hw);
dvb_dmxdev_release(&fe->dvb.dmxdev);
dvb_dmx_release(&fe->dvb.demux);
dvb_unregister_frontend(fe->dvb.frontend);
}
if (fe->dvb.frontend)
/* always allocated, may have been reset */
dvb_frontend_detach(fe->dvb.frontend);
list_del(list); /* remove list entry */
kfree(fe); /* free frontend allocation */
}
mutex_unlock(&f->lock);
}
EXPORT_SYMBOL(vb2_dvb_dealloc_frontends);
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