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Commit 7679ba7b authored by Michael Hunold's avatar Michael Hunold Committed by Linus Torvalds
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[PATCH] DVB: Add EN50221 cam support to dvb-core 

 - [DVB] add generic functions for EN50221 CAM interfaces
parent 2b7f4a04
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drivers/media/dvb/dvb-core/Makefile
View file @ 7679ba7b
......@@ -3,6 +3,7 @@
#
dvb-core-objs = dvbdev.o dmxdev.o dvb_demux.o dvb_filter.o \
dvb_functions.o dvb_frontend.o dvb_i2c.o dvb_net.o dvb_ksyms.o dvb_ringbuffer.o
dvb_ca_en50221.o dvb_functions.o dvb_frontend.o \
dvb_i2c.o dvb_net.o dvb_ksyms.o dvb_ringbuffer.o
obj-$(CONFIG_DVB_CORE) += dvb-core.o
drivers/media/dvb/dvb-core/dvb_ca_en50221.c 0 → 100644
View file @ 7679ba7b
/*
* dvb_ca.c: generic DVB functions for EN50221 CAM interfaces
*
* Copyright (C) 2004 Andrew de Quincey
*
* Parts of this file were based on sources as follows:
*
* Copyright (C) 2003 Ralph Metzler <rjkm@metzlerbros.de>
*
* based on code:
*
* Copyright (C) 1999-2002 Ralph Metzler
* & Marcus Metzler for convergence integrated media GmbH
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
* Or, point your browser to http://www.gnu.org/copyleft/gpl.html
*/
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <asm/semaphore.h>
#include <asm/atomic.h>
#include "dvb_ca_en50221.h"
#include "dvb_functions.h"
#include "dvb_ringbuffer.h"
static int dvb_ca_en50221_debug = 0;
#define dprintk if (dvb_ca_en50221_debug) printk
#define INIT_TIMEOUT_SECS 5
#define HOST_LINK_BUF_SIZE 0x200
#define RX_BUFFER_SIZE 65535
#define MAX_RX_PACKETS_PER_ITERATION 10
#define CTRLIF_DATA 0
#define CTRLIF_COMMAND 1
#define CTRLIF_STATUS 1
#define CTRLIF_SIZE_LOW 2
#define CTRLIF_SIZE_HIGH 3
#define CMDREG_HC 1 /* Host control */
#define CMDREG_SW 2 /* Size write */
#define CMDREG_SR 4 /* Size read */
#define CMDREG_RS 8 /* Reset interface */
#define CMDREG_FRIE 0x40 /* Enable FR interrupt */
#define CMDREG_DAIE 0x80 /* Enable DA interrupt */
#define IRQEN (CMDREG_DAIE)
#define STATUSREG_RE 1 /* read error */
#define STATUSREG_WE 2 /* write error */
#define STATUSREG_FR 0x40 /* module free */
#define STATUSREG_DA 0x80 /* data available */
#define STATUSREG_TXERR (STATUSREG_RE|STATUSREG_WE) /* general transfer error */
#define DVB_CA_SLOTSTATE_NONE 0
#define DVB_CA_SLOTSTATE_UNINITIALISED 1
#define DVB_CA_SLOTSTATE_RUNNING 2
#define DVB_CA_SLOTSTATE_INVALID 3
#define DVB_CA_SLOTSTATE_WAITREADY 4
#define DVB_CA_SLOTSTATE_VALIDATE 5
#define DVB_CA_SLOTSTATE_WAITFR 6
#define DVB_CA_SLOTSTATE_LINKINIT 7
/* Information on a CA slot */
struct dvb_ca_slot {
/* current state of the CAM */
int slot_state;
/* Number of CAMCHANGES that have occurred since last processing */
atomic_t camchange_count;
/* Type of last CAMCHANGE */
int camchange_type;
/* base address of CAM config */
u32 config_base;
/* value to write into Config Control register */
u8 config_option;
/* if 1, the CAM supports DA IRQs */
u8 da_irq_supported:1;
/* size of the buffer to use when talking to the CAM */
int link_buf_size;
/* semaphore for syncing access to slot structure */
struct semaphore sem;
/* buffer for incoming packets */
struct dvb_ringbuffer rx_buffer;
/* timer used during various states of the slot */
unsigned long timeout;
};
/* Private CA-interface information */
struct dvb_ca_private {
/* pointer back to the public data structure */
struct dvb_ca_en50221* pub;
/* the DVB device */
struct dvb_device *dvbdev;
/* Flags describing the interface (DVB_CA_FLAG_*) */
u32 flags;
/* number of slots supported by this CA interface */
unsigned int slot_count;
/* information on each slot */
struct dvb_ca_slot* slot_info;
/* wait queues for read() and write() operations */
wait_queue_head_t wait_queue;
/* PID of the monitoring thread */
pid_t thread_pid;
/* Wait queue used when shutting thread down */
wait_queue_head_t thread_queue;
/* Flag indicating when thread should exit */
int exit:1;
/* Flag indicating if the CA device is open */
int open:1;
/* Flag indicating the thread should wake up now */
int wakeup:1;
/* Delay the main thread should use */
unsigned long delay;
/* Slot to start looking for data to read from in the next user-space read operation */
int next_read_slot;
};
static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private* ca);
static int dvb_ca_en50221_read_data(struct dvb_ca_private* ca, int slot, u8* ebuf, int ecount);
static int dvb_ca_en50221_write_data(struct dvb_ca_private* ca, int slot, u8* ebuf, int ecount);
/**
* Safely find needle in haystack.
*
* @param haystack Buffer to look in.
* @param hlen Number of bytes in haystack.
* @param needle Buffer to find.
* @param nlen Number of bytes in needle.
* @return Pointer into haystack needle was found at, or NULL if not found.
*/
static u8* findstr(u8* haystack, int hlen, u8* needle, int nlen)
{
int i;
if (hlen < nlen) return NULL;
for(i=0; i<= hlen - nlen; i++) {
if (!strncmp(haystack+i, needle, nlen)) return haystack+i;
}
return NULL;
}
/* ******************************************************************************** */
/* EN50221 physical interface functions */
/**
* Check CAM status.
*/
static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private* ca, int slot)
{
int slot_status;
int status;
int cam_present_now;
int cam_changed;
/* IRQ mode */
if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) {
return (atomic_read(&ca->slot_info[slot].camchange_count) != 0);
}
/* poll mode */
if ((status = down_interruptible(&ca->slot_info[slot].sem)) != 0) return status;
slot_status = ca->pub->poll_slot_status(ca->pub, slot);
up(&ca->slot_info[slot].sem);
cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1: 0;
cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1: 0;
if (!cam_changed) {
int cam_present_old = (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE);
cam_changed = (cam_present_now != cam_present_old);
}
if (cam_changed) {
if (!cam_present_now) {
ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
} else {
ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED;
}
atomic_set(&ca->slot_info[slot].camchange_count, 1);
} else {
if ((ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) &&
(slot_status & DVB_CA_EN50221_POLL_CAM_READY)) {
// move to validate state if reset is completed
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
}
}
return cam_changed;
}
/**
* Wait for flags to become set on the STATUS register on a CAM interface,
* checking for errors and timeout.
*
* @param ca CA instance.
* @param slot Slot on interface.
* @param waitfor Flags to wait for.
* @param timeout_ms Timeout in milliseconds.
*
* @return 0 on success, nonzero on error.
*/
static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private* ca, int slot, u8 waitfor, int timeout_hz)
{
unsigned long timeout;
unsigned long start;
dprintk ("%s\n", __FUNCTION__);
/* loop until timeout elapsed */
start = jiffies;
timeout = jiffies + timeout_hz;
while(1) {
/* read the status and check for error */
int res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
if (res < 0) return -EIO;
/* if we got the flags, it was successful! */
if (res & waitfor) {
dprintk("%s succeeded timeout:%lu\n", __FUNCTION__, jiffies - start);
return 0;
}
/* check for timeout */
if (time_after(jiffies, timeout)) {
break;
}
/* wait for a bit */
dvb_delay(1);
}
dprintk("%s failed timeout:%lu\n", __FUNCTION__, jiffies - start);
/* if we get here, we've timed out */
return -ETIMEDOUT;
}
/**
* Initialise the link layer connection to a CAM.
*
* @param ca CA instance.
* @param slot Slot id.
*
* @return 0 on success, nonzero on failure.
*/
static int dvb_ca_en50221_link_init(struct dvb_ca_private* ca, int slot)
{
int ret;
int buf_size;
u8 buf[2];
dprintk ("%s\n", __FUNCTION__);
/* we'll be determining these during this function */
ca->slot_info[slot].da_irq_supported = 0;
/* reset the link interface. Note CAM IRQs are disabled */
if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, CMDREG_RS)) != 0) return ret;
if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ/10)) != 0) return ret;
/* set the host link buffer size temporarily. it will be overwritten with the
* real negotiated size later. */
ca->slot_info[slot].link_buf_size = 2;
/* read the buffer size from the CAM */
if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SR)) != 0) return ret;
if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ/10)) != 0) return ret;
if ((ret = dvb_ca_en50221_read_data(ca, slot, buf, 2)) != 2) return -EIO;
if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0) return ret;
/* store it, and choose the minimum of our buffer and the CAM's buffer size */
buf_size = (buf[0] << 8) | buf[1];
if (buf_size > HOST_LINK_BUF_SIZE) buf_size = HOST_LINK_BUF_SIZE;
ca->slot_info[slot].link_buf_size = buf_size;
buf[0] = buf_size >> 8;
buf[1] = buf_size & 0xff;
dprintk("Chosen link buffer size of %i\n", buf_size);
/* write the buffer size to the CAM */
if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SW)) != 0) return ret;
if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ/10)) != 0) return ret;
if ((ret = dvb_ca_en50221_write_data(ca, slot, buf, 2)) != 2) return -EIO;
if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0) return ret;
/* success */
return 0;
}
/**
* Read a tuple from attribute memory.
*
* @param ca CA instance.
* @param slot Slot id.
* @param address Address to read from. Updated.
* @param tupleType Tuple id byte. Updated.
* @param tupleLength Tuple length. Updated.
* @param tuple Dest buffer for tuple (must be 256 bytes). Updated.
*
* @return 0 on success, nonzero on error.
*/
static int dvb_ca_en50221_read_tuple(struct dvb_ca_private* ca, int slot,
int* address, int* tupleType, int* tupleLength, u8* tuple)
{
int i;
int _tupleType;
int _tupleLength;
int _address = *address;
/* grab the next tuple length and type */
if ((_tupleType = ca->pub->read_attribute_mem(ca->pub, slot, _address)) < 0) return _tupleType;
if ((_tupleLength = ca->pub->read_attribute_mem(ca->pub, slot, _address+2)) < 0) return _tupleLength;
_address += 4;
dprintk("TUPLE type:0x%x length:%i\n", _tupleType, _tupleLength);
/* read in the whole tuple */
for(i=0; i< _tupleLength; i++) {
tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, _address + (i*2));
dprintk(" 0x%02x: 0x%02x %c\n", i, tuple[i] & 0xff, ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.');
}
_address += (_tupleLength*2);
// success
*tupleType = _tupleType;
*tupleLength = _tupleLength;
*address = _address;
return 0;
}
/**
* Parse attribute memory of a CAM module, extracting Config register, and checking
* it is a DVB CAM module.
*
* @param ca CA instance.
* @param slot Slot id.
*
* @return 0 on success, <0 on failure.
*/
static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private* ca, int slot)
{
int address = 0;
int tupleLength;
int tupleType;
u8 tuple[257];
char* dvb_str;
int rasz;
int status;
int got_cftableentry = 0;
int end_chain = 0;
int i;
u16 manfid = 0;
u16 devid = 0;
// CISTPL_DEVICE_0A
if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) return status;
if (tupleType != 0x1D) return -EINVAL;
// CISTPL_DEVICE_0C
if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) return status;
if (tupleType != 0x1C) return -EINVAL;
// CISTPL_VERS_1
if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) return status;
if (tupleType != 0x15) return -EINVAL;
// CISTPL_MANFID
if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) return status;
if (tupleType != 0x20) return -EINVAL;
if (tupleLength != 4) return -EINVAL;
manfid = (tuple[1] << 8) | tuple[0];
devid = (tuple[3] << 8) | tuple[2];
// CISTPL_CONFIG
if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) return status;
if (tupleType != 0x1A) return -EINVAL;
if (tupleLength < 3) return -EINVAL;
/* extract the configbase */
rasz = tuple[0] & 3;
if (tupleLength < (3 + rasz + 14)) return -EINVAL;
ca->slot_info[slot].config_base = 0;
for(i=0; i< rasz+1; i++) {
ca->slot_info[slot].config_base |= (tuple[2+i] << (8*i));
}
/* check it contains the correct DVB string */
dvb_str = findstr(tuple, tupleLength, "DVB_CI_V", 8);
if (dvb_str == NULL) return -EINVAL;
if (tupleLength < ((dvb_str - (char*) tuple) + 12)) return -EINVAL;
/* is it a version we support? */
if (strncmp(dvb_str + 8, "1.00", 4)) {
printk("dvb_ca: Unsupported DVB CAM module version %c%c%c%c\n",
dvb_str[8], dvb_str[9], dvb_str[10], dvb_str[11]);
return -EINVAL;
}
/* process the CFTABLE_ENTRY tuples, and any after those */
while((!end_chain) && (address < 0x1000)) {
if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) return status;
switch(tupleType) {
case 0x1B: // CISTPL_CFTABLE_ENTRY
if (tupleLength < (2+11+17)) break;
/* if we've already parsed one, just use it */
if (got_cftableentry) break;
/* get the config option */
ca->slot_info[slot].config_option = tuple[0] & 0x3f;
/* OK, check it contains the correct strings */
if ((findstr(tuple, tupleLength, "DVB_HOST", 8) == NULL) ||
(findstr(tuple, tupleLength, "DVB_CI_MODULE", 13) == NULL)) break;
got_cftableentry = 1;
break;
case 0x14: // CISTPL_NO_LINK
break;
case 0xFF: // CISTPL_END
end_chain = 1;
break;
default: /* Unknown tuple type - just skip this tuple and move to the next one */
dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n", tupleType, tupleLength);
break;
}
}
if ((address > 0x1000) || (!got_cftableentry)) return -EINVAL;
dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n",
manfid, devid,
ca->slot_info[slot].config_base,
ca->slot_info[slot].config_option);
// success!
return 0;
}
/**
* Set CAM's configoption correctly.
*
* @param ca CA instance.
* @param slot Slot containing the CAM.
*/
static int dvb_ca_en50221_set_configoption(struct dvb_ca_private* ca, int slot)
{
int configoption;
dprintk ("%s\n", __FUNCTION__);
/* set the config option */
ca->pub->write_attribute_mem(ca->pub, slot, ca->slot_info[slot].config_base, ca->slot_info[slot].config_option);
/* check it */
configoption = ca->pub->read_attribute_mem(ca->pub, slot, ca->slot_info[slot].config_base);
dprintk("Set configoption 0x%x, read configoption 0x%x\n",
ca->slot_info[slot].config_option, configoption & 0x3f);
/* fine! */
return 0;
}
/**
* This function talks to an EN50221 CAM control interface. It reads a buffer of
* data from the CAM. The data can either be stored in a supplied buffer, or
* automatically be added to the slot's rx_buffer.
*
* @param ca CA instance.
* @param slot Slot to read from.
* @param ebuf If non-NULL, the data will be written to this buffer. If NULL,
* the data will be added into the buffering system as a normal fragment.
* @param ecount Size of ebuf. Ignored if ebuf is NULL.
*
* @return Number of bytes read, or < 0 on error
*/
static int dvb_ca_en50221_read_data(struct dvb_ca_private* ca, int slot, u8* ebuf, int ecount)
{
int bytes_read;
int status;
u8 buf[HOST_LINK_BUF_SIZE];
int i;
dprintk ("%s\n", __FUNCTION__);
/* acquire the slot */
if ((status = down_interruptible(&ca->slot_info[slot].sem)) != 0) return status;
/* check if we have space for a link buf in the rx_buffer */
if (ebuf == NULL) {
if (dvb_ringbuffer_free(&ca->slot_info[slot].rx_buffer) <
(ca->slot_info[slot].link_buf_size + DVB_RINGBUFFER_PKTHDRSIZE)) {
status = -EAGAIN;
goto exit;
}
}
/* reset the interface if there's been a tx error */
if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) goto exit;
if (status & STATUSREG_TXERR) {
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
status = -EIO;
goto exit;
}
if (!(status & STATUSREG_DA)) {
/* no data */
status = 0;
goto exit;
}
/* read the amount of data */
if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH)) < 0) goto exit;
bytes_read = status << 8;
if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW)) < 0) goto exit;
bytes_read |= status;
/* check it will fit */
if (ebuf == NULL) {
if (bytes_read > ca->slot_info[slot].link_buf_size) {
printk("dvb_ca: CAM tried to send a buffer larger than the link buffer size!\n");
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
status = -EIO;
goto exit;
}
if (bytes_read < 2) {
printk("dvb_ca: CAM sent a buffer that was less than 2 bytes!\n");
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
status = -EIO;
goto exit;
}
} else {
if (bytes_read > ecount) {
printk("dvb_ca: CAM tried to send a buffer larger than the ecount size!\n");
status = -EIO;
goto exit;
}
}
/* fill the buffer */
for(i=0; i < bytes_read; i++) {
/* read byte and check */
if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_DATA)) < 0) goto exit;
/* OK, store it in the buffer */
buf[i] = status;
}
/* check for read error (RE should now go to 0) */
if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) goto exit;
if (status & STATUSREG_RE) {
status = -EIO;
goto exit;
}
/* OK, add it to the receive buffer, or copy into external buffer if supplied */
if (ebuf == NULL) {
dvb_ringbuffer_pkt_write(&ca->slot_info[slot].rx_buffer, buf, bytes_read, 0);
} else {
memcpy(ebuf, buf, bytes_read);
}
/* wake up readers when a last_fragment is received */
if ((buf[1] & 0x80) == 0x00) {
wake_up_interruptible(&ca->wait_queue);
}
status = bytes_read;
exit:
up(&ca->slot_info[slot].sem);
return status;
}
/**
* This function talks to an EN50221 CAM control interface. It writes a buffer of data
* to a CAM.
*
* @param ca CA instance.
* @param slot Slot to write to.
* @param ebuf The data in this buffer is treated as a complete link-level packet to
* be written.
* @param count Size of ebuf.
*
* @return Number of bytes written, or < 0 on error.
*/
static int dvb_ca_en50221_write_data(struct dvb_ca_private* ca, int slot, u8* buf, int bytes_write)
{
int status;
int i;
dprintk ("%s\n", __FUNCTION__);
// sanity check
if (bytes_write > ca->slot_info[slot].link_buf_size) return -EINVAL;
/* acquire the slot */
if ((status = down_interruptible(&ca->slot_info[slot].sem)) != 0) return status;
/* reset the interface if there's been a tx error */
if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) goto exitnowrite;
if (status & STATUSREG_TXERR) {
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
status = -EIO;
goto exitnowrite;
}
/* check if interface is actually waiting for us to read from it */
if (status & STATUSREG_DA) {
status = -EAGAIN;
goto exitnowrite;
}
/* OK, set HC bit */
if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_HC)) != 0) goto exit;
/* check if interface is still free */
if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) goto exit;
if (!(status & STATUSREG_FR)) {
/* it wasn't free => try again later */
status = -EAGAIN;
goto exit;
}
/* send the amount of data */
if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, bytes_write >> 8)) != 0) goto exit;
if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW, bytes_write & 0xff)) != 0) goto exit;
/* send the buffer */
for(i=0; i < bytes_write; i++) {
if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, buf[i])) != 0) goto exit;
}
/* check for write error (WE should now be 0) */
if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) goto exit;
if (status & STATUSREG_WE) {
status = -EIO;
goto exit;
}
status = bytes_write;
exit:
ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
exitnowrite:
up(&ca->slot_info[slot].sem);
return status;
}
/* ******************************************************************************** */
/* EN50221 higher level functions */
/**
* A CAM has been removed => shut it down.
*
* @param ca CA instance.
* @param slot Slot to shut down.
*/
static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private* ca, int slot)
{
int status;
dprintk ("%s\n", __FUNCTION__);
if ((status = down_interruptible(&ca->slot_info[slot].sem)) != 0) return status;
ca->pub->slot_shutdown(ca->pub, slot);
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
if (ca->slot_info[slot].rx_buffer.data) vfree(ca->slot_info[slot].rx_buffer.data);
ca->slot_info[slot].rx_buffer.data = NULL;
up(&ca->slot_info[slot].sem);
/* need to wake up all processes to check if they're now
trying to write to a defunct CAM */
wake_up_interruptible(&ca->wait_queue);
dprintk("Slot %i shutdown\n", slot);
/* success */
return 0;
}
/**
* A CAMCHANGE IRQ has occurred.
*
* @param ca CA instance.
* @param slot Slot concerned.
* @param change_type One of the DVB_CA_CAMCHANGE_* values.
*/
void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221* pubca, int slot, int change_type)
{
struct dvb_ca_private* ca = (struct dvb_ca_private*) pubca->private;
dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type);
switch(change_type) {
case DVB_CA_EN50221_CAMCHANGE_REMOVED:
case DVB_CA_EN50221_CAMCHANGE_INSERTED:
break;
default:
return;
}
ca->slot_info[slot].camchange_type = change_type;
atomic_inc(&ca->slot_info[slot].camchange_count);
dvb_ca_en50221_thread_wakeup(ca);
}
/**
* A CAMREADY IRQ has occurred.
*
* @param ca CA instance.
* @param slot Slot concerned.
*/
void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221* pubca, int slot)
{
struct dvb_ca_private* ca = (struct dvb_ca_private*) pubca->private;
dprintk("CAMREADY IRQ slot:%i\n", slot);
if (ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) {
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
dvb_ca_en50221_thread_wakeup(ca);
}
}
/**
* An FR or DA IRQ has occurred.
*
* @param ca CA instance.
* @param slot Slot concerned.
*/
void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221* pubca, int slot)
{
struct dvb_ca_private* ca = (struct dvb_ca_private*) pubca->private;
int flags;
dprintk("FR/DA IRQ slot:%i\n", slot);
switch(ca->slot_info[slot].slot_state) {
case DVB_CA_SLOTSTATE_LINKINIT:
flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS);
if (flags & STATUSREG_DA) {
dprintk("CAM supports DA IRQ\n");
ca->slot_info[slot].da_irq_supported = 1;
}
break;
case DVB_CA_SLOTSTATE_RUNNING:
flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS);
if (flags & STATUSREG_DA) {
dvb_ca_en50221_thread_wakeup(ca);
}
break;
}
}
/* ******************************************************************************** */
/* EN50221 thread functions */
/**
* Wake up the DVB CA thread
*
* @param ca CA instance.
*/
static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private* ca)
{
dprintk ("%s\n", __FUNCTION__);
ca->wakeup = 1;
mb();
wake_up_interruptible(&ca->thread_queue);
}
/**
* Used by the CA thread to determine if an early wakeup is necessary
*
* @param ca CA instance.
*/
static int dvb_ca_en50221_thread_should_wakeup(struct dvb_ca_private* ca)
{
if (ca->wakeup) {
ca->wakeup = 0;
return 1;
}
if (ca->exit) return 1;
return 0;
}
/**
* Update the delay used by the thread.
*
* @param ca CA instance.
*/
static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private* ca)
{
int delay;
int curdelay = 100000000;
int slot;
for(slot=0; slot < ca->slot_count; slot++) {
switch(ca->slot_info[slot].slot_state) {
default:
case DVB_CA_SLOTSTATE_NONE:
case DVB_CA_SLOTSTATE_INVALID:
delay = HZ*60;
if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) {
delay = HZ/10;
}
break;
case DVB_CA_SLOTSTATE_UNINITIALISED:
case DVB_CA_SLOTSTATE_WAITREADY:
case DVB_CA_SLOTSTATE_VALIDATE:
case DVB_CA_SLOTSTATE_WAITFR:
case DVB_CA_SLOTSTATE_LINKINIT:
delay = HZ/10;
break;
case DVB_CA_SLOTSTATE_RUNNING:
delay = HZ*60;
if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) {
delay = HZ/10;
}
if (ca->open) {
if ((!ca->slot_info[slot].da_irq_supported) ||
(!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA))) {
delay = HZ/100;
}
}
break;
}
if (delay < curdelay) curdelay = delay;
}
ca->delay = curdelay;
}
/**
* Kernel thread which monitors CA slots for CAM changes, and performs data transfers.
*/
static int dvb_ca_en50221_thread(void* data)
{
struct dvb_ca_private *ca = (struct dvb_ca_private*) data;
char name[15];
int slot;
int flags;
int pktcount;
void* rxbuf;
dprintk ("%s\n", __FUNCTION__);
/* setup kernel thread */
snprintf(name, sizeof(name), "kdvb-ca-%i:%i", ca->dvbdev->adapter->num, ca->dvbdev->id);
dvb_kernel_thread_setup(name);
/* choose the correct initial delay */
dvb_ca_en50221_thread_update_delay(ca);
/* main loop */
while(!ca->exit) {
/* sleep for a bit */
if (!ca->wakeup) {
flags = wait_event_interruptible_timeout(ca->thread_queue, dvb_ca_en50221_thread_should_wakeup(ca), ca->delay);
if ((flags == -ERESTARTSYS) || ca->exit) {
/* got signal or quitting */
break;
}
}
ca->wakeup = 0;
/* go through all the slots processing them */
for(slot=0; slot < ca->slot_count; slot++) {
// check the cam status + deal with CAMCHANGEs
while(dvb_ca_en50221_check_camstatus(ca, slot)) {
/* clear down an old CI slot if necessary */
if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) dvb_ca_en50221_slot_shutdown(ca, slot);
/* if a CAM is NOW present, initialise it */
if (ca->slot_info[slot].camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) {
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_UNINITIALISED;
}
/* we've handled one CAMCHANGE */
dvb_ca_en50221_thread_update_delay(ca);
atomic_dec(&ca->slot_info[slot].camchange_count);
}
// CAM state machine
switch(ca->slot_info[slot].slot_state) {
case DVB_CA_SLOTSTATE_NONE:
case DVB_CA_SLOTSTATE_INVALID:
// no action needed
break;
case DVB_CA_SLOTSTATE_UNINITIALISED:
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITREADY;
ca->pub->slot_reset(ca->pub, slot);
ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
break;
case DVB_CA_SLOTSTATE_WAITREADY:
if (time_after(jiffies, ca->slot_info[slot].timeout)) {
printk("dvb_ca: PC card did not respond :(\n");
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
dvb_ca_en50221_thread_update_delay(ca);
break;
}
// no other action needed; will automatically change state when ready
break;
case DVB_CA_SLOTSTATE_VALIDATE:
if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) {
printk("dvb_ca: Invalid PC card inserted :(\n");
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
dvb_ca_en50221_thread_update_delay(ca);
break;
}
if (dvb_ca_en50221_set_configoption(ca, slot) != 0) {
printk("dvb_ca: Unable to initialise CAM :(\n");
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
dvb_ca_en50221_thread_update_delay(ca);
break;
}
dprintk("DVB CAM validated successfully\n");
ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITFR;
ca->wakeup = 1;
break;
case DVB_CA_SLOTSTATE_WAITFR:
if (time_after(jiffies, ca->slot_info[slot].timeout)) {
printk("dvb_ca: DVB CAM did not respond :(\n");
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
dvb_ca_en50221_thread_update_delay(ca);
break;
}
flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
if (flags & STATUSREG_FR) {
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
ca->wakeup = 1;
}
break;
case DVB_CA_SLOTSTATE_LINKINIT:
if (dvb_ca_en50221_link_init(ca, slot) != 0) {
printk("dvb_ca: DVB CAM link initialisation failed :(\n");
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
dvb_ca_en50221_thread_update_delay(ca);
break;
}
rxbuf = vmalloc(RX_BUFFER_SIZE);
if (rxbuf == NULL) {
printk("dvb_ca: Unable to allocate CAM rx buffer :(\n");
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
dvb_ca_en50221_thread_update_delay(ca);
break;
}
dvb_ringbuffer_init(&ca->slot_info[slot].rx_buffer, rxbuf, RX_BUFFER_SIZE);
ca->pub->slot_ts_enable(ca->pub, slot);
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_RUNNING;
dvb_ca_en50221_thread_update_delay(ca);
printk("dvb_ca: DVB CAM detected and initialised successfully\n");
break;
case DVB_CA_SLOTSTATE_RUNNING:
if (!ca->open) break;
pktcount = 0;
while(dvb_ca_en50221_read_data(ca, slot, NULL, 0) > 0) {
if (!ca->open) break;
/* if a CAMCHANGE occurred at some point, do not do any more processing of this slot */
if (dvb_ca_en50221_check_camstatus(ca, slot)) {
// we dont want to sleep on the next iteration so we can handle the cam change
ca->wakeup = 1;
break;
}
/* check if we've hit our limit this time */
if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) {
// dont sleep; there is likely to be more data to read
ca->wakeup = 1;
break;
}
}
break;
}
}
}
/* completed */
ca->thread_pid = 0;
mb();
wake_up_interruptible (&ca->thread_queue);
return 0;
}
/* ******************************************************************************** */
/* EN50221 IO interface functions */
/**
* Real ioctl implementation.
* NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them.
*
* @param inode Inode concerned.
* @param file File concerned.
* @param cmd IOCTL command.
* @param arg Associated argument.
*
* @return 0 on success, <0 on error.
*/
static int dvb_ca_en50221_io_do_ioctl(struct inode *inode, struct file *file, unsigned int cmd, void *parg)
{
struct dvb_device* dvbdev=(struct dvb_device*) file->private_data;
struct dvb_ca_private* ca = (struct dvb_ca_private*) dvbdev->priv;
int err=0;
int slot;
dprintk ("%s\n", __FUNCTION__);
switch (cmd) {
case CA_RESET:
for(slot = 0; slot < ca->slot_count; slot++) {
if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) {
dvb_ca_en50221_slot_shutdown(ca, slot);
if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)
dvb_ca_en50221_camchange_irq(ca->pub, slot, DVB_CA_EN50221_CAMCHANGE_INSERTED);
}
}
ca->next_read_slot = 0;
dvb_ca_en50221_thread_wakeup(ca);
break;
case CA_GET_CAP:
{
struct ca_caps *caps = (struct ca_caps*) parg;
caps->slot_num=ca->slot_count;
caps->slot_type=CA_CI_LINK;
caps->descr_num=0;
caps->descr_type=0;
break;
}
case CA_GET_SLOT_INFO:
{
struct ca_slot_info *info=(struct ca_slot_info *)parg;
if ((info->num > ca->slot_count) || (info->num < 0))
return -EINVAL;
info->type = CA_CI_LINK;
info->flags = 0;
if ((ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_NONE) &&
(ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_INVALID)) {
info->flags = CA_CI_MODULE_PRESENT;
}
if (ca->slot_info[info->num].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
info->flags |= CA_CI_MODULE_READY;
}
break;
}
default:
err=-EINVAL;
break;
}
return err;
}
/**
* Wrapper for ioctl implementation.
*
* @param inode Inode concerned.
* @param file File concerned.
* @param cmd IOCTL command.
* @param arg Associated argument.
*
* @return 0 on success, <0 on error.
*/
static int dvb_ca_en50221_io_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{
return dvb_usercopy(inode, file, cmd, arg, dvb_ca_en50221_io_do_ioctl);
}
/**
* Implementation of write() syscall.
*
* @param file File structure.
* @param buf Source buffer.
* @param count Size of source buffer.
* @param ppos Position in file (ignored).
*
* @return Number of bytes read, or <0 on error.
*/
static ssize_t dvb_ca_en50221_io_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
{
struct dvb_device *dvbdev=(struct dvb_device *) file->private_data;
struct dvb_ca_private *ca=(struct dvb_ca_private*) dvbdev->priv;
u8 slot, connection_id;
int status;
char fragbuf[HOST_LINK_BUF_SIZE];
int fragpos = 0;
int fraglen;
unsigned long timeout;
int written;
dprintk ("%s\n", __FUNCTION__);
/* Incoming packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
if (count < 2) return -EINVAL;
/* extract slot & connection id */
if (copy_from_user(&slot, buf, 1)) return -EFAULT;
if (copy_from_user(&connection_id, buf+1, 1)) return -EFAULT;
buf+=2;
count-=2;
/* check if the slot is actually running */
if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) return -EINVAL;
/* fragment the packets & store in the buffer */
while(fragpos < count) {
fraglen = ca->slot_info[slot].link_buf_size - 2;
if ((count - fragpos) < fraglen) fraglen = count - fragpos;
fragbuf[0] = connection_id;
fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00;
if ((status = copy_from_user(fragbuf+2, buf+fragpos, fraglen)) != 0) goto exit;
timeout = jiffies + HZ/2;
written = 0;
while(!time_after(jiffies, timeout)) {
status = dvb_ca_en50221_write_data(ca, slot, fragbuf, fraglen+2);
if (status == (fraglen+2)) {
written = 1;
break;
}
if (status != -EAGAIN) goto exit;
dvb_delay(1);
}
if (!written) {
status = -EIO;
goto exit;
}
fragpos += fraglen;
}
status = count + 2;
exit:
return status;
}
/**
* Condition for waking up in dvb_ca_en50221_io_read_condition
*/
static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private* ca, int* result, int* _slot)
{
int slot;
int slot_count = 0;
int idx;
int fraglen;
int connection_id = -1;
int found = 0;
u8 hdr[2];
slot = ca->next_read_slot;
while((slot_count < ca->slot_count) && (!found)) {
if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) goto nextslot;
if ((*result = down_interruptible(&ca->slot_info[slot].sem)) != 0) return 1;
idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
while(idx != -1) {
dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2, 0);
if (connection_id == -1) connection_id = hdr[0];
if ((hdr[0] == connection_id) && ((hdr[1] & 0x80) == 0)) {
*_slot = slot;
found = 1;
break;
}
idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
}
if (!found) up(&ca->slot_info[slot].sem);
nextslot:
slot = (slot + 1) % ca->slot_count;
slot_count++;
}
ca->next_read_slot = slot;
return found;
}
/**
* Implementation of read() syscall.
*
* @param file File structure.
* @param buf Destination buffer.
* @param count Size of destination buffer.
* @param ppos Position in file (ignored).
*
* @return Number of bytes read, or <0 on error.
*/
static ssize_t dvb_ca_en50221_io_read(struct file *file, char *buf, size_t count, loff_t *ppos)
{
struct dvb_device *dvbdev=(struct dvb_device *) file->private_data;
struct dvb_ca_private *ca=(struct dvb_ca_private*) dvbdev->priv;
int status;
int result = 0;
u8 hdr[2];
int slot;
int connection_id = -1;
size_t idx, idx2;
int last_fragment = 0;
size_t fraglen;
int pktlen;
int dispose = 0;
dprintk ("%s\n", __FUNCTION__);
/* Outgoing packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
if (count < 2) return -EINVAL;
/* wait for some data */
if ((status = dvb_ca_en50221_io_read_condition(ca, &result, &slot)) == 0) {
/* if we're in nonblocking mode, exit immediately */
if (file->f_flags & O_NONBLOCK) return -EWOULDBLOCK;
/* wait for some data */
status = wait_event_interruptible(ca->wait_queue, dvb_ca_en50221_io_read_condition(ca, &result, &slot));
}
if ((status < 0) || (result < 0)) {
if (result) return result;
return status;
}
idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
pktlen = 2;
do {
if (idx == -1) {
printk("dvb_ca: BUG: read packet ended before last_fragment encountered\n");
status = -EIO;
goto exit;
}
dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2, 0);
if (connection_id == -1) connection_id = hdr[0];
if (hdr[0] == connection_id) {
if (pktlen < count) {
if ((pktlen + fraglen - 2) > count) {
fraglen = count - pktlen;
} else {
fraglen -= 2;
}
if ((status = dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 2, buf + pktlen, fraglen, 1)) < 0) {
goto exit;
}
pktlen += fraglen;
}
if ((hdr[1] & 0x80) == 0) last_fragment = 1;
dispose = 1;
}
idx2 = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
if (dispose) dvb_ringbuffer_pkt_dispose(&ca->slot_info[slot].rx_buffer, idx);
idx = idx2;
dispose = 0;
} while (!last_fragment);
hdr[0] = slot;
hdr[1] = connection_id;
if ((status = copy_to_user(buf, hdr, 2)) != 0) goto exit;
status = pktlen;
exit:
up(&ca->slot_info[slot].sem);
return status;
}
/**
* Implementation of file open syscall.
*
* @param inode Inode concerned.
* @param file File concerned.
*
* @return 0 on success, <0 on failure.
*/
static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file)
{
struct dvb_device *dvbdev = (struct dvb_device *) file->private_data;
struct dvb_ca_private *ca = (struct dvb_ca_private*) dvbdev->priv;
int err;
int i;
dprintk ("%s\n", __FUNCTION__);
err=dvb_generic_open(inode, file);
if (err<0)
return err;
for(i=0; i< ca->slot_count; i++) {
if (ca->slot_info[i].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
dvb_ringbuffer_flush(&ca->slot_info[i].rx_buffer);
}
}
ca->open = 1;
dvb_ca_en50221_thread_update_delay(ca);
dvb_ca_en50221_thread_wakeup(ca);
return 0;
}
/**
* Implementation of file close syscall.
*
* @param inode Inode concerned.
* @param file File concerned.
*
* @return 0 on success, <0 on failure.
*/
static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file)
{
struct dvb_device *dvbdev=(struct dvb_device *) file->private_data;
struct dvb_ca_private *ca=(struct dvb_ca_private*) dvbdev->priv;
int err;
dprintk ("%s\n", __FUNCTION__);
/* mark the CA device as closed */
ca->open = 0;
dvb_ca_en50221_thread_update_delay(ca);
err=dvb_generic_release(inode, file);
if (err<0)
return err;
return 0;
}
/**
* Implementation of poll() syscall.
*
* @param file File concerned.
* @param wait poll wait table.
*
* @return Standard poll mask.
*/
static unsigned int dvb_ca_en50221_io_poll(struct file *file, poll_table *wait)
{
struct dvb_device* dvbdev = (struct dvb_device*) file->private_data;
struct dvb_ca_private* ca = (struct dvb_ca_private*) dvbdev->priv;
unsigned int mask=0;
int slot;
int result = 0;
dprintk ("%s\n", __FUNCTION__);
if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
up(&ca->slot_info[slot].sem);
mask |= POLLIN;
}
/* if there is something, return now */
if (mask) return mask;
/* wait for something to happen */
poll_wait(file, &ca->wait_queue, wait);
if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
up(&ca->slot_info[slot].sem);
mask |= POLLIN;
}
return mask;
}
static struct file_operations dvb_ca_fops = {
owner: THIS_MODULE,
read: dvb_ca_en50221_io_read,
write: dvb_ca_en50221_io_write,
ioctl: dvb_ca_en50221_io_ioctl,
open: dvb_ca_en50221_io_open,
release: dvb_ca_en50221_io_release,
poll: dvb_ca_en50221_io_poll,
};
static struct dvb_device dvbdev_ca = {
priv: 0,
users: 1,
readers: 1,
writers: 1,
fops: &dvb_ca_fops,
};
/* ******************************************************************************** */
/* Initialisation/shutdown functions */
/**
* Initialise a new DVB CA EN50221 interface device.
*
* @param dvb_adapter DVB adapter to attach the new CA device to.
* @param ca The dvb_ca instance.
* @param flags Flags describing the CA device (DVB_CA_FLAG_*).
* @param slot_count Number of slots supported.
*
* @return 0 on success, nonzero on failure
*/
int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter, struct dvb_ca_en50221* pubca, int flags, int slot_count)
{
int ret;
struct dvb_ca_private* ca = NULL;
int i;
dprintk ("%s\n", __FUNCTION__);
if (slot_count < 1) return -EINVAL;
/* initialise the system data */
if ((ca = (struct dvb_ca_private*) kmalloc(sizeof(struct dvb_ca_private), GFP_KERNEL)) == NULL) {
ret = -ENOMEM;
goto error;
}
memset(ca, 0, sizeof(struct dvb_ca_private));
ca->pub = pubca;
ca->flags = flags;
ca->slot_count = slot_count;
if ((ca->slot_info = kmalloc(sizeof(struct dvb_ca_slot) * slot_count, GFP_KERNEL)) == NULL) {
ret = -ENOMEM;
goto error;
}
memset(ca->slot_info, 0, sizeof(struct dvb_ca_slot) * slot_count);
init_waitqueue_head(&ca->wait_queue);
ca->thread_pid = 0;
init_waitqueue_head(&ca->thread_queue);
ca->exit = 0;
ca->open = 0;
ca->wakeup = 0;
ca->next_read_slot = 0;
pubca->private = ca;
/* register the DVB device */
ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, DVB_DEVICE_CA);
if (ret) goto error;
/* now initialise each slot */
for(i=0; i< slot_count; i++) {
memset(&ca->slot_info[i], 0, sizeof(struct dvb_ca_slot));
ca->slot_info[i].slot_state = DVB_CA_SLOTSTATE_NONE;
atomic_set(&ca->slot_info[i].camchange_count, 0);
ca->slot_info[i].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
init_MUTEX(&ca->slot_info[i].sem);
}
if (signal_pending(current)) {
ret = -EINTR;
goto error;
}
mb();
/* create a kthread for monitoring this CA device */
ret = kernel_thread (dvb_ca_en50221_thread, ca, 0);
if (ret < 0) {
printk("dvb_ca_init: failed to start kernel_thread (%d)\n", ret);
goto error;
}
ca->thread_pid = ret;
return 0;
error:
if (ca != NULL) {
if (ca->dvbdev != NULL) dvb_unregister_device(ca->dvbdev);
if (ca->slot_info != NULL) kfree(ca->slot_info);
kfree(ca);
}
pubca->private = NULL;
return ret;
}
/**
* Release a DVB CA EN50221 interface device.
*
* @param ca_dev The dvb_device_t instance for the CA device.
* @param ca The associated dvb_ca instance.
*/
void dvb_ca_en50221_release(struct dvb_ca_en50221* pubca)
{
struct dvb_ca_private* ca = (struct dvb_ca_private*) pubca->private;
int i;
dprintk ("%s\n", __FUNCTION__);
/* shutdown the thread if there was one */
if (ca->thread_pid) {
if (kill_proc(ca->thread_pid, 0, 1) == -ESRCH) {
printk("dvb_ca_release: thread PID %d already died\n", ca->thread_pid);
} else {
ca->exit = 1;
mb();
dvb_ca_en50221_thread_wakeup(ca);
wait_event_interruptible(ca->thread_queue, ca->thread_pid == 0);
}
}
for(i=0; i< ca->slot_count; i++) {
dvb_ca_en50221_slot_shutdown(ca, i);
}
kfree(ca->slot_info);
dvb_unregister_device(ca->dvbdev);
kfree(ca);
pubca->private = NULL;
}
MODULE_PARM(dvb_ca_en50221_debug,"i");
MODULE_PARM_DESC(dvb_ca_en50221_debug, "enable verbose debug messages");
drivers/media/dvb/dvb-core/dvb_ca_en50221.h 0 → 100644
View file @ 7679ba7b
/*
* dvb_ca.h: generic DVB functions for EN50221 CA interfaces
*
* Copyright (C) 2004 Andrew de Quincey
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation; either version 2.1
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef _DVB_CA_EN50221_H_
#define _DVB_CA_EN50221_H_
#include <linux/list.h>
#include <linux/dvb/ca.h>
#include "dvbdev.h"
#define DVB_CA_EN50221_POLL_CAM_PRESENT 1
#define DVB_CA_EN50221_POLL_CAM_CHANGED 2
#define DVB_CA_EN50221_POLL_CAM_READY 4
#define DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE 1
#define DVB_CA_EN50221_FLAG_IRQ_FR 2
#define DVB_CA_EN50221_FLAG_IRQ_DA 4
#define DVB_CA_EN50221_CAMCHANGE_REMOVED 0
#define DVB_CA_EN50221_CAMCHANGE_INSERTED 1
/* Structure describing a CA interface */
struct dvb_ca_en50221 {
/* functions for accessing attribute memory on the CAM */
int (*read_attribute_mem)(struct dvb_ca_en50221* ca, int slot, int address);
int (*write_attribute_mem)(struct dvb_ca_en50221* ca, int slot, int address, u8 value);
/* functions for accessing the control interface on the CAM */
int (*read_cam_control)(struct dvb_ca_en50221* ca, int slot, u8 address);
int (*write_cam_control)(struct dvb_ca_en50221* ca, int slot, u8 address, u8 value);
/* Functions for controlling slots */
int (*slot_reset)(struct dvb_ca_en50221* ca, int slot);
int (*slot_shutdown)(struct dvb_ca_en50221* ca, int slot);
int (*slot_ts_enable)(struct dvb_ca_en50221* ca, int slot);
/*
* Poll slot status.
* Only necessary if DVB_CA_FLAG_EN50221_IRQ_CAMCHANGE is not set
*/
int (*poll_slot_status)(struct dvb_ca_en50221* ca, int slot);
/* private data, used by caller */
void* data;
/* Opaque data used by the dvb_ca core. Do not modify! */
void* private;
};
/* ******************************************************************************** */
/* Functions for reporting IRQ events */
/**
* A CAMCHANGE IRQ has occurred.
*
* @param ca CA instance.
* @param slot Slot concerned.
* @param change_type One of the DVB_CA_CAMCHANGE_* values
*/
void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221* pubca, int slot, int change_type);
/**
* A CAMREADY IRQ has occurred.
*
* @param ca CA instance.
* @param slot Slot concerned.
*/
void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221* pubca, int slot);
/**
* An FR or a DA IRQ has occurred.
*
* @param ca CA instance.
* @param slot Slot concerned.
*/
void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221* ca, int slot);
/* ******************************************************************************** */
/* Initialisation/shutdown functions */
/**
* Initialise a new DVB CA device.
*
* @param dvb_adapter DVB adapter to attach the new CA device to.
* @param ca The dvb_ca instance.
* @param flags Flags describing the CA device (DVB_CA_EN50221_FLAG_*).
* @param slot_count Number of slots supported.
*
* @return 0 on success, nonzero on failure
*/
extern int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter, struct dvb_ca_en50221* ca, int flags, int slot_count);
/**
* Release a DVB CA device.
*
* @param ca The associated dvb_ca instance.
*/
extern void dvb_ca_en50221_release(struct dvb_ca_en50221* ca);
#endif
drivers/media/dvb/dvb-core/dvb_ksyms.c
View file @ 7679ba7b
......@@ -10,6 +10,7 @@
#include "dvb_frontend.h"
#include "dvb_net.h"
#include "dvb_filter.h"
#include "dvb_ca_en50221.h"
EXPORT_SYMBOL(dvb_dmxdev_init);
EXPORT_SYMBOL(dvb_dmxdev_release);
......@@ -49,3 +50,8 @@ EXPORT_SYMBOL(dvb_filter_pes2ts_init);
EXPORT_SYMBOL(dvb_filter_pes2ts);
EXPORT_SYMBOL(dvb_filter_get_ac3info);
EXPORT_SYMBOL(dvb_ca_en50221_init);
EXPORT_SYMBOL(dvb_ca_en50221_release);
EXPORT_SYMBOL(dvb_ca_en50221_frda_irq);
EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq);
EXPORT_SYMBOL(dvb_ca_en50221_camready_irq);
drivers/media/dvb/dvb-core/dvb_ringbuffer.c
View file @ 7679ba7b
......@@ -3,9 +3,10 @@
* dvb_ringbuffer.c: ring buffer implementation for the dvb driver
*
* Copyright (C) 2003 Oliver Endriss
* Copyright (C) 2004 Andrew de Quincey
*
* based on code originally found in av7110.c:
* Copyright (C) 1999-2002 Ralph Metzler
* based on code originally found in av7110.c & dvb_ci.c:
* Copyright (C) 1999-2003 Ralph Metzler
* & Marcus Metzler for convergence integrated media GmbH
*
* This program is free software; you can redistribute it and/or
......@@ -24,6 +25,8 @@
*/
#define __KERNEL_SYSCALLS__
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
......@@ -33,6 +36,8 @@
#include "dvb_ringbuffer.h"
#define PKT_READY 0
#define PKT_DISPOSED 1
void dvb_ringbuffer_init(struct dvb_ringbuffer *rbuf, void *data, size_t len)
......@@ -158,6 +163,109 @@ ssize_t dvb_ringbuffer_write(struct dvb_ringbuffer *rbuf, const u8 *buf,
return len;
}
ssize_t dvb_ringbuffer_pkt_write(struct dvb_ringbuffer *rbuf, u8* buf, size_t len, int usermem)
{
int status;
ssize_t oldpwrite = rbuf->pwrite;
DVB_RINGBUFFER_WRITE_BYTE(rbuf, len >> 8);
DVB_RINGBUFFER_WRITE_BYTE(rbuf, len & 0xff);
DVB_RINGBUFFER_WRITE_BYTE(rbuf, PKT_READY);
status = dvb_ringbuffer_write(rbuf, buf, len, usermem);
if (status < 0) rbuf->pwrite = oldpwrite;
return status;
}
ssize_t dvb_ringbuffer_pkt_read(struct dvb_ringbuffer *rbuf, size_t idx,
int offset, u8* buf, size_t len, int usermem)
{
size_t todo;
size_t split;
size_t pktlen;
pktlen = rbuf->data[idx] << 8;
pktlen |= rbuf->data[(idx + 1) % rbuf->size];
if (offset > pktlen) return -EINVAL;
if ((offset + len) > pktlen) len = pktlen - offset;
idx = (idx + DVB_RINGBUFFER_PKTHDRSIZE + offset) % rbuf->size;
todo = len;
split = ((idx + len) > rbuf->size) ? rbuf->size - idx : 0;
if (split > 0) {
if (!usermem)
memcpy(buf, rbuf->data+idx, split);
else
if (copy_to_user(buf, rbuf->data+idx, split))
return -EFAULT;
buf += split;
todo -= split;
idx = 0;
}
if (!usermem)
memcpy(buf, rbuf->data+idx, todo);
else
if (copy_to_user(buf, rbuf->data+idx, todo))
return -EFAULT;
return len;
}
void dvb_ringbuffer_pkt_dispose(struct dvb_ringbuffer *rbuf, size_t idx)
{
size_t pktlen;
rbuf->data[(idx + 2) % rbuf->size] = PKT_DISPOSED;
// clean up disposed packets
while(dvb_ringbuffer_avail(rbuf) > DVB_RINGBUFFER_PKTHDRSIZE) {
if (DVB_RINGBUFFER_PEEK(rbuf, 2) == PKT_DISPOSED) {
pktlen = DVB_RINGBUFFER_PEEK(rbuf, 0) << 8;
pktlen |= DVB_RINGBUFFER_PEEK(rbuf, 1);
DVB_RINGBUFFER_SKIP(rbuf, pktlen + DVB_RINGBUFFER_PKTHDRSIZE);
} else {
// first packet is not disposed, so we stop cleaning now
break;
}
}
}
ssize_t dvb_ringbuffer_pkt_next(struct dvb_ringbuffer *rbuf, size_t idx, size_t* pktlen)
{
int consumed;
int curpktlen;
int curpktstatus;
if (idx == -1) {
idx = rbuf->pread;
} else {
curpktlen = rbuf->data[idx] << 8;
curpktlen |= rbuf->data[(idx + 1) % rbuf->size];
idx = (idx + curpktlen + DVB_RINGBUFFER_PKTHDRSIZE) % rbuf->size;
}
consumed = (idx - rbuf->pread) % rbuf->size;
while((dvb_ringbuffer_avail(rbuf) - consumed) > DVB_RINGBUFFER_PKTHDRSIZE) {
curpktlen = rbuf->data[idx] << 8;
curpktlen |= rbuf->data[(idx + 1) % rbuf->size];
curpktstatus = rbuf->data[(idx + 2) % rbuf->size];
if (curpktstatus == PKT_READY) {
*pktlen = curpktlen;
return idx;
}
consumed += curpktlen + DVB_RINGBUFFER_PKTHDRSIZE;
idx = (idx + curpktlen + DVB_RINGBUFFER_PKTHDRSIZE) % rbuf->size;
}
// no packets available
return -1;
}
EXPORT_SYMBOL(dvb_ringbuffer_init);
EXPORT_SYMBOL(dvb_ringbuffer_empty);
......@@ -167,3 +275,7 @@ EXPORT_SYMBOL(dvb_ringbuffer_flush);
EXPORT_SYMBOL(dvb_ringbuffer_flush_spinlock_wakeup);
EXPORT_SYMBOL(dvb_ringbuffer_read);
EXPORT_SYMBOL(dvb_ringbuffer_write);
EXPORT_SYMBOL(dvb_ringbuffer_pkt_write);
EXPORT_SYMBOL(dvb_ringbuffer_pkt_read);
EXPORT_SYMBOL(dvb_ringbuffer_pkt_dispose);
EXPORT_SYMBOL(dvb_ringbuffer_pkt_next);
drivers/media/dvb/dvb-core/dvb_ringbuffer.h
View file @ 7679ba7b
......@@ -3,9 +3,10 @@
* dvb_ringbuffer.h: ring buffer implementation for the dvb driver
*
* Copyright (C) 2003 Oliver Endriss
* Copyright (C) 2004 Andrew de Quincey
*
* based on code originally found in av7110.c:
* Copyright (C) 1999-2002 Ralph Metzler & Marcus Metzler
* based on code originally found in av7110.c & dvb_ci.c:
* Copyright (C) 1999-2003 Ralph Metzler & Marcus Metzler
* for convergence integrated media GmbH
*
* This program is free software; you can redistribute it and/or
......@@ -39,6 +40,8 @@ struct dvb_ringbuffer {
spinlock_t lock;
};
#define DVB_RINGBUFFER_PKTHDRSIZE 3
/*
** Notes:
......@@ -120,4 +123,52 @@ extern ssize_t dvb_ringbuffer_read(struct dvb_ringbuffer *rbuf, u8 *buf,
extern ssize_t dvb_ringbuffer_write(struct dvb_ringbuffer *rbuf, const u8 *buf,
size_t len, int usermem);
/**
* Write a packet into the ringbuffer.
*
* <rbuf> Ringbuffer to write to.
* <buf> Buffer to write.
* <len> Length of buffer (currently limited to 65535 bytes max).
* <usermem> Set to 1 if <buf> is in userspace.
* returns Number of bytes written, or -EFAULT, -ENOMEM, -EVINAL.
*/
extern ssize_t dvb_ringbuffer_pkt_write(struct dvb_ringbuffer *rbuf, u8* buf,
size_t len, int usermem);
/**
* Read from a packet in the ringbuffer. Note: unlike dvb_ringbuffer_read(), this
* does NOT update the read pointer in the ringbuffer. You must use
* dvb_ringbuffer_pkt_dispose() to mark a packet as no longer required.
*
* <rbuf> Ringbuffer concerned.
* <idx> Packet index as returned by dvb_ringbuffer_pkt_next().
* <offset> Offset into packet to read from.
* <buf> Destination buffer for data.
* <len> Size of destination buffer.
* <usermem> Set to 1 if <buf> is in userspace.
* returns Number of bytes read, or -EFAULT.
*/
extern ssize_t dvb_ringbuffer_pkt_read(struct dvb_ringbuffer *rbuf, size_t idx,
int offset, u8* buf, size_t len, int usermem);
/**
* Dispose of a packet in the ring buffer.
*
* <rbuf> Ring buffer concerned.
* <idx> Packet index as returned by dvb_ringbuffer_pkt_next().
*/
extern void dvb_ringbuffer_pkt_dispose(struct dvb_ringbuffer *rbuf, size_t idx);
/**
* Get the index of the next packet in a ringbuffer.
*
* <rbuf> Ringbuffer concerned.
* <idx> Previous packet index, or -1 to return the first packet index.
* <pktlen> On success, will be updated to contain the length of the packet in bytes.
* returns Packet index (if >=0), or -1 if no packets available.
*/
extern ssize_t dvb_ringbuffer_pkt_next(struct dvb_ringbuffer *rbuf, size_t idx, size_t* pktlen);
#endif /* _DVB_RINGBUFFER_H_ */
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