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Subject[PATCH 4/9] DVB: Add EN50221 cam support to dvb-core
Date
- [DVB] add generic functions for EN50221 CAM interfaces
diff -urawBN xx-linux-2.6.5/drivers/media/dvb/dvb-core/dvb_ca_en50221.c linux-2.6.5-patched/drivers/media/dvb/dvb-core/dvb_ca_en50221.c
--- xx-linux-2.6.5/drivers/media/dvb/dvb-core/dvb_ca_en50221.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.5-patched/drivers/media/dvb/dvb-core/dvb_ca_en50221.c 2004-04-23 21:51:15.000000000 +0200
@@ -0,0 +1,1628 @@
+/*
+ * 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");
diff -urawBN xx-linux-2.6.5/drivers/media/dvb/dvb-core/dvb_ca_en50221.h linux-2.6.5-patched/drivers/media/dvb/dvb-core/dvb_ca_en50221.h
--- xx-linux-2.6.5/drivers/media/dvb/dvb-core/dvb_ca_en50221.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6.5-patched/drivers/media/dvb/dvb-core/dvb_ca_en50221.h 2004-04-05 14:17:33.000000000 +0200
@@ -0,0 +1,128 @@
+/*
+ * 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
diff -urawBN xx-linux-2.6.5/drivers/media/dvb/dvb-core/dvb_ksyms.c linux-2.6.5-patched/drivers/media/dvb/dvb-core/dvb_ksyms.c
--- xx-linux-2.6.5/drivers/media/dvb/dvb-core/dvb_ksyms.c 2004-01-16 18:25:17.000000000 +0100
+++ linux-2.6.5-patched/drivers/media/dvb/dvb-core/dvb_ksyms.c 2004-04-05 14:17:33.000000000 +0200
@@ -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);
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);
diff -urawBN xx-linux-2.6.5/drivers/media/dvb/dvb-core/dvb_ringbuffer.c linux-2.6.5-patched/drivers/media/dvb/dvb-core/dvb_ringbuffer.c
--- xx-linux-2.6.5/drivers/media/dvb/dvb-core/dvb_ringbuffer.c 2004-03-12 20:31:28.000000000 +0100
+++ linux-2.6.5-patched/drivers/media/dvb/dvb-core/dvb_ringbuffer.c 2004-04-14 12:31:21.000000000 +0200
@@ -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 @@
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_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);
diff -urawBN xx-linux-2.6.5/drivers/media/dvb/dvb-core/dvb_ringbuffer.h linux-2.6.5-patched/drivers/media/dvb/dvb-core/dvb_ringbuffer.h
--- xx-linux-2.6.5/drivers/media/dvb/dvb-core/dvb_ringbuffer.h 2004-01-16 18:25:17.000000000 +0100
+++ linux-2.6.5-patched/drivers/media/dvb/dvb-core/dvb_ringbuffer.h 2004-04-05 14:17:33.000000000 +0200
@@ -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 @@
spinlock_t lock;
};

+#define DVB_RINGBUFFER_PKTHDRSIZE 3
+

/*
** Notes:
@@ -120,4 +123,52 @@
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_ */
diff -urawBN xx-linux-2.6.5/drivers/media/dvb/dvb-core/Makefile linux-2.6.5-patched/drivers/media/dvb/dvb-core/Makefile
--- xx-linux-2.6.5/drivers/media/dvb/dvb-core/Makefile 2003-12-18 03:59:56.000000000 +0100
+++ linux-2.6.5-patched/drivers/media/dvb/dvb-core/Makefile 2004-04-05 14:17:33.000000000 +0200
@@ -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

-
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