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linux_dsm_epyc7002/drivers/media/pci/mantis/mantis_dvb.c
Colin Ian King 77d30eab04 media: mantis_dvb: remove redundant initialization to variable result 
The variable result is being initialized with a value that is never read
and it is being updated later with a new value.  The initialization is
redundant and can be removed.

Addresses-Coverity: ("Unused value")

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
2020-05-12 17:32:51 +02:00

291 lines
7.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
/*
Mantis PCI bridge driver
Copyright (C) Manu Abraham (abraham.manu@gmail.com)
*/
#include <linux/kernel.h>
#include <linux/bitops.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/i2c.h>
#include <media/dmxdev.h>
#include <media/dvbdev.h>
#include <media/dvb_demux.h>
#include <media/dvb_frontend.h>
#include <media/dvb_net.h>
#include "mantis_common.h"
#include "mantis_dma.h"
#include "mantis_ca.h"
#include "mantis_ioc.h"
#include "mantis_dvb.h"
DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
int mantis_frontend_power(struct mantis_pci *mantis, enum mantis_power power)
{
struct mantis_hwconfig *config = mantis->hwconfig;
switch (power) {
case POWER_ON:
dprintk(MANTIS_DEBUG, 1, "Power ON");
mantis_gpio_set_bits(mantis, config->power, POWER_ON);
msleep(100);
mantis_gpio_set_bits(mantis, config->power, POWER_ON);
msleep(100);
break;
case POWER_OFF:
dprintk(MANTIS_DEBUG, 1, "Power OFF");
mantis_gpio_set_bits(mantis, config->power, POWER_OFF);
msleep(100);
break;
default:
dprintk(MANTIS_DEBUG, 1, "Unknown state <%02x>", power);
return -1;
}
return 0;
}
EXPORT_SYMBOL_GPL(mantis_frontend_power);
void mantis_frontend_soft_reset(struct mantis_pci *mantis)
{
struct mantis_hwconfig *config = mantis->hwconfig;
dprintk(MANTIS_DEBUG, 1, "Frontend RESET");
mantis_gpio_set_bits(mantis, config->reset, 0);
msleep(100);
mantis_gpio_set_bits(mantis, config->reset, 0);
msleep(100);
mantis_gpio_set_bits(mantis, config->reset, 1);
msleep(100);
mantis_gpio_set_bits(mantis, config->reset, 1);
msleep(100);
return;
}
EXPORT_SYMBOL_GPL(mantis_frontend_soft_reset);
static int mantis_frontend_shutdown(struct mantis_pci *mantis)
{
int err;
mantis_frontend_soft_reset(mantis);
err = mantis_frontend_power(mantis, POWER_OFF);
if (err != 0) {
dprintk(MANTIS_ERROR, 1, "Frontend POWER OFF failed! <%d>", err);
return 1;
}
return 0;
}
static int mantis_dvb_start_feed(struct dvb_demux_feed *dvbdmxfeed)
{
struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
struct mantis_pci *mantis = dvbdmx->priv;
dprintk(MANTIS_DEBUG, 1, "Mantis DVB Start feed");
if (!dvbdmx->dmx.frontend) {
dprintk(MANTIS_DEBUG, 1, "no frontend ?");
return -EINVAL;
}
mantis->feeds++;
dprintk(MANTIS_DEBUG, 1, "mantis start feed, feeds=%d", mantis->feeds);
if (mantis->feeds == 1) {
dprintk(MANTIS_DEBUG, 1, "mantis start feed & dma");
mantis_dma_start(mantis);
tasklet_enable(&mantis->tasklet);
}
return mantis->feeds;
}
static int mantis_dvb_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
{
struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
struct mantis_pci *mantis = dvbdmx->priv;
dprintk(MANTIS_DEBUG, 1, "Mantis DVB Stop feed");
if (!dvbdmx->dmx.frontend) {
dprintk(MANTIS_DEBUG, 1, "no frontend ?");
return -EINVAL;
}
mantis->feeds--;
if (mantis->feeds == 0) {
dprintk(MANTIS_DEBUG, 1, "mantis stop feed and dma");
tasklet_disable(&mantis->tasklet);
mantis_dma_stop(mantis);
}
return 0;
}
int mantis_dvb_init(struct mantis_pci *mantis)
{
struct mantis_hwconfig *config = mantis->hwconfig;
int result;
dprintk(MANTIS_DEBUG, 1, "dvb_register_adapter");
result = dvb_register_adapter(&mantis->dvb_adapter,
"Mantis DVB adapter",
THIS_MODULE,
&mantis->pdev->dev,
adapter_nr);
if (result < 0) {
dprintk(MANTIS_ERROR, 1, "Error registering adapter");
return -ENODEV;
}
mantis->dvb_adapter.priv = mantis;
mantis->demux.dmx.capabilities = DMX_TS_FILTERING |
DMX_SECTION_FILTERING |
DMX_MEMORY_BASED_FILTERING;
mantis->demux.priv = mantis;
mantis->demux.filternum = 256;
mantis->demux.feednum = 256;
mantis->demux.start_feed = mantis_dvb_start_feed;
mantis->demux.stop_feed = mantis_dvb_stop_feed;
mantis->demux.write_to_decoder = NULL;
dprintk(MANTIS_DEBUG, 1, "dvb_dmx_init");
result = dvb_dmx_init(&mantis->demux);
if (result < 0) {
dprintk(MANTIS_ERROR, 1, "dvb_dmx_init failed, ERROR=%d", result);
goto err0;
}
mantis->dmxdev.filternum = 256;
mantis->dmxdev.demux = &mantis->demux.dmx;
mantis->dmxdev.capabilities = 0;
dprintk(MANTIS_DEBUG, 1, "dvb_dmxdev_init");
result = dvb_dmxdev_init(&mantis->dmxdev, &mantis->dvb_adapter);
if (result < 0) {
dprintk(MANTIS_ERROR, 1, "dvb_dmxdev_init failed, ERROR=%d", result);
goto err1;
}
mantis->fe_hw.source = DMX_FRONTEND_0;
result = mantis->demux.dmx.add_frontend(&mantis->demux.dmx, &mantis->fe_hw);
if (result < 0) {
dprintk(MANTIS_ERROR, 1, "dvb_dmx_init failed, ERROR=%d", result);
goto err2;
}
mantis->fe_mem.source = DMX_MEMORY_FE;
result = mantis->demux.dmx.add_frontend(&mantis->demux.dmx, &mantis->fe_mem);
if (result < 0) {
dprintk(MANTIS_ERROR, 1, "dvb_dmx_init failed, ERROR=%d", result);
goto err3;
}
result = mantis->demux.dmx.connect_frontend(&mantis->demux.dmx, &mantis->fe_hw);
if (result < 0) {
dprintk(MANTIS_ERROR, 1, "dvb_dmx_init failed, ERROR=%d", result);
goto err4;
}
dvb_net_init(&mantis->dvb_adapter, &mantis->dvbnet, &mantis->demux.dmx);
tasklet_init(&mantis->tasklet, mantis_dma_xfer, (unsigned long) mantis);
tasklet_disable(&mantis->tasklet);
if (mantis->hwconfig) {
result = config->frontend_init(mantis, mantis->fe);
if (result < 0) {
dprintk(MANTIS_ERROR, 1, "!!! NO Frontends found !!!");
goto err5;
} else {
if (mantis->fe == NULL) {
result = -ENOMEM;
dprintk(MANTIS_ERROR, 1, "FE <NULL>");
goto err5;
}
result = dvb_register_frontend(&mantis->dvb_adapter, mantis->fe);
if (result) {
dprintk(MANTIS_ERROR, 1, "ERROR: Frontend registration failed");
if (mantis->fe->ops.release)
mantis->fe->ops.release(mantis->fe);
mantis->fe = NULL;
goto err5;
}
}
}
return 0;
/* Error conditions .. */
err5:
tasklet_kill(&mantis->tasklet);
dvb_net_release(&mantis->dvbnet);
if (mantis->fe) {
dvb_unregister_frontend(mantis->fe);
dvb_frontend_detach(mantis->fe);
}
err4:
mantis->demux.dmx.remove_frontend(&mantis->demux.dmx, &mantis->fe_mem);
err3:
mantis->demux.dmx.remove_frontend(&mantis->demux.dmx, &mantis->fe_hw);
err2:
dvb_dmxdev_release(&mantis->dmxdev);
err1:
dvb_dmx_release(&mantis->demux);
err0:
dvb_unregister_adapter(&mantis->dvb_adapter);
return result;
}
EXPORT_SYMBOL_GPL(mantis_dvb_init);
int mantis_dvb_exit(struct mantis_pci *mantis)
{
int err;
if (mantis->fe) {
/* mantis_ca_exit(mantis); */
err = mantis_frontend_shutdown(mantis);
if (err != 0)
dprintk(MANTIS_ERROR, 1, "Frontend exit while POWER ON! <%d>", err);
dvb_unregister_frontend(mantis->fe);
dvb_frontend_detach(mantis->fe);
}
tasklet_kill(&mantis->tasklet);
dvb_net_release(&mantis->dvbnet);
mantis->demux.dmx.remove_frontend(&mantis->demux.dmx, &mantis->fe_mem);
mantis->demux.dmx.remove_frontend(&mantis->demux.dmx, &mantis->fe_hw);
dvb_dmxdev_release(&mantis->dmxdev);
dvb_dmx_release(&mantis->demux);
dprintk(MANTIS_DEBUG, 1, "dvb_unregister_adapter");
dvb_unregister_adapter(&mantis->dvb_adapter);
return 0;
}
EXPORT_SYMBOL_GPL(mantis_dvb_exit);
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