2 * dvb_ca.c: generic DVB functions for EN50221 CAM interfaces
4 * Copyright (C) 2004 Andrew de Quincey
6 * Parts of this file were based on sources as follows:
8 * Copyright (C) 2003 Ralph Metzler <rjkm@metzlerbros.de>
12 * Copyright (C) 1999-2002 Ralph Metzler
13 * & Marcus Metzler for convergence integrated media GmbH
15 * This program is free software; you can redistribute it and/or
16 * modify it under the terms of the GNU General Public License
17 * as published by the Free Software Foundation; either version 2
18 * of the License, or (at your option) any later version.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
28 * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
31 #include <linux/errno.h>
32 #include <linux/slab.h>
33 #include <linux/list.h>
34 #include <linux/module.h>
35 #include <linux/moduleparam.h>
36 #include <linux/vmalloc.h>
37 #include <linux/delay.h>
38 #include <linux/spinlock.h>
39 #include <linux/sched.h>
41 #include "dvb_ca_en50221.h"
42 #include "dvb_ringbuffer.h"
44 static int dvb_ca_en50221_debug;
46 module_param_named(cam_debug, dvb_ca_en50221_debug, int, 0644);
47 MODULE_PARM_DESC(cam_debug, "enable verbose debug messages");
49 #define dprintk if (dvb_ca_en50221_debug) printk
51 #define INIT_TIMEOUT_SECS 10
53 #define HOST_LINK_BUF_SIZE 0x200
55 #define RX_BUFFER_SIZE 65535
57 #define MAX_RX_PACKETS_PER_ITERATION 10
60 #define CTRLIF_COMMAND 1
61 #define CTRLIF_STATUS 1
62 #define CTRLIF_SIZE_LOW 2
63 #define CTRLIF_SIZE_HIGH 3
65 #define CMDREG_HC 1 /* Host control */
66 #define CMDREG_SW 2 /* Size write */
67 #define CMDREG_SR 4 /* Size read */
68 #define CMDREG_RS 8 /* Reset interface */
69 #define CMDREG_FRIE 0x40 /* Enable FR interrupt */
70 #define CMDREG_DAIE 0x80 /* Enable DA interrupt */
71 #define IRQEN (CMDREG_DAIE)
73 #define STATUSREG_RE 1 /* read error */
74 #define STATUSREG_WE 2 /* write error */
75 #define STATUSREG_FR 0x40 /* module free */
76 #define STATUSREG_DA 0x80 /* data available */
77 #define STATUSREG_TXERR (STATUSREG_RE|STATUSREG_WE) /* general transfer error */
80 #define DVB_CA_SLOTSTATE_NONE 0
81 #define DVB_CA_SLOTSTATE_UNINITIALISED 1
82 #define DVB_CA_SLOTSTATE_RUNNING 2
83 #define DVB_CA_SLOTSTATE_INVALID 3
84 #define DVB_CA_SLOTSTATE_WAITREADY 4
85 #define DVB_CA_SLOTSTATE_VALIDATE 5
86 #define DVB_CA_SLOTSTATE_WAITFR 6
87 #define DVB_CA_SLOTSTATE_LINKINIT 7
90 /* Information on a CA slot */
93 /* current state of the CAM */
96 /* Number of CAMCHANGES that have occurred since last processing */
97 atomic_t camchange_count;
99 /* Type of last CAMCHANGE */
102 /* base address of CAM config */
105 /* value to write into Config Control register */
108 /* if 1, the CAM supports DA IRQs */
109 u8 da_irq_supported:1;
111 /* size of the buffer to use when talking to the CAM */
114 /* buffer for incoming packets */
115 struct dvb_ringbuffer rx_buffer;
117 /* timer used during various states of the slot */
118 unsigned long timeout;
121 /* Private CA-interface information */
122 struct dvb_ca_private {
124 /* pointer back to the public data structure */
125 struct dvb_ca_en50221 *pub;
128 struct dvb_device *dvbdev;
130 /* Flags describing the interface (DVB_CA_FLAG_*) */
133 /* number of slots supported by this CA interface */
134 unsigned int slot_count;
136 /* information on each slot */
137 struct dvb_ca_slot *slot_info;
139 /* wait queues for read() and write() operations */
140 wait_queue_head_t wait_queue;
142 /* PID of the monitoring thread */
145 /* Wait queue used when shutting thread down */
146 wait_queue_head_t thread_queue;
148 /* Flag indicating when thread should exit */
151 /* Flag indicating if the CA device is open */
154 /* Flag indicating the thread should wake up now */
155 unsigned int wakeup:1;
157 /* Delay the main thread should use */
160 /* Slot to start looking for data to read from in the next user-space read operation */
164 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca);
165 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount);
166 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount);
170 * Safely find needle in haystack.
172 * @param haystack Buffer to look in.
173 * @param hlen Number of bytes in haystack.
174 * @param needle Buffer to find.
175 * @param nlen Number of bytes in needle.
176 * @return Pointer into haystack needle was found at, or NULL if not found.
178 static u8 *findstr(u8 * haystack, int hlen, u8 * needle, int nlen)
185 for (i = 0; i <= hlen - nlen; i++) {
186 if (!strncmp(haystack + i, needle, nlen))
195 /* ******************************************************************************** */
196 /* EN50221 physical interface functions */
202 static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot)
209 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) {
210 return (atomic_read(&ca->slot_info[slot].camchange_count) != 0);
214 slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open);
216 cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0;
217 cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0;
219 int cam_present_old = (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE);
220 cam_changed = (cam_present_now != cam_present_old);
224 if (!cam_present_now) {
225 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
227 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED;
229 atomic_set(&ca->slot_info[slot].camchange_count, 1);
231 if ((ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) &&
232 (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) {
233 // move to validate state if reset is completed
234 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
243 * Wait for flags to become set on the STATUS register on a CAM interface,
244 * checking for errors and timeout.
246 * @param ca CA instance.
247 * @param slot Slot on interface.
248 * @param waitfor Flags to wait for.
249 * @param timeout_ms Timeout in milliseconds.
251 * @return 0 on success, nonzero on error.
253 static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot,
254 u8 waitfor, int timeout_hz)
256 unsigned long timeout;
259 dprintk("%s\n", __FUNCTION__);
261 /* loop until timeout elapsed */
263 timeout = jiffies + timeout_hz;
265 /* read the status and check for error */
266 int res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
270 /* if we got the flags, it was successful! */
272 dprintk("%s succeeded timeout:%lu\n", __FUNCTION__, jiffies - start);
276 /* check for timeout */
277 if (time_after(jiffies, timeout)) {
285 dprintk("%s failed timeout:%lu\n", __FUNCTION__, jiffies - start);
287 /* if we get here, we've timed out */
293 * Initialise the link layer connection to a CAM.
295 * @param ca CA instance.
296 * @param slot Slot id.
298 * @return 0 on success, nonzero on failure.
300 static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot)
306 dprintk("%s\n", __FUNCTION__);
308 /* we'll be determining these during this function */
309 ca->slot_info[slot].da_irq_supported = 0;
311 /* set the host link buffer size temporarily. it will be overwritten with the
312 * real negotiated size later. */
313 ca->slot_info[slot].link_buf_size = 2;
315 /* read the buffer size from the CAM */
316 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SR)) != 0)
318 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ / 10)) != 0)
320 if ((ret = dvb_ca_en50221_read_data(ca, slot, buf, 2)) != 2)
322 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
325 /* store it, and choose the minimum of our buffer and the CAM's buffer size */
326 buf_size = (buf[0] << 8) | buf[1];
327 if (buf_size > HOST_LINK_BUF_SIZE)
328 buf_size = HOST_LINK_BUF_SIZE;
329 ca->slot_info[slot].link_buf_size = buf_size;
330 buf[0] = buf_size >> 8;
331 buf[1] = buf_size & 0xff;
332 dprintk("Chosen link buffer size of %i\n", buf_size);
334 /* write the buffer size to the CAM */
335 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SW)) != 0)
337 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10)) != 0)
339 if ((ret = dvb_ca_en50221_write_data(ca, slot, buf, 2)) != 2)
341 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
349 * Read a tuple from attribute memory.
351 * @param ca CA instance.
352 * @param slot Slot id.
353 * @param address Address to read from. Updated.
354 * @param tupleType Tuple id byte. Updated.
355 * @param tupleLength Tuple length. Updated.
356 * @param tuple Dest buffer for tuple (must be 256 bytes). Updated.
358 * @return 0 on success, nonzero on error.
360 static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot,
361 int *address, int *tupleType, int *tupleLength, u8 * tuple)
366 int _address = *address;
368 /* grab the next tuple length and type */
369 if ((_tupleType = ca->pub->read_attribute_mem(ca->pub, slot, _address)) < 0)
371 if (_tupleType == 0xff) {
372 dprintk("END OF CHAIN TUPLE type:0x%x\n", _tupleType);
374 *tupleType = _tupleType;
378 if ((_tupleLength = ca->pub->read_attribute_mem(ca->pub, slot, _address + 2)) < 0)
382 dprintk("TUPLE type:0x%x length:%i\n", _tupleType, _tupleLength);
384 /* read in the whole tuple */
385 for (i = 0; i < _tupleLength; i++) {
386 tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, _address + (i * 2));
387 dprintk(" 0x%02x: 0x%02x %c\n",
389 ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.');
391 _address += (_tupleLength * 2);
394 *tupleType = _tupleType;
395 *tupleLength = _tupleLength;
402 * Parse attribute memory of a CAM module, extracting Config register, and checking
403 * it is a DVB CAM module.
405 * @param ca CA instance.
406 * @param slot Slot id.
408 * @return 0 on success, <0 on failure.
410 static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot)
419 int got_cftableentry = 0;
428 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
430 if (tupleType != 0x1D)
437 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
439 if (tupleType != 0x1C)
446 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
448 if (tupleType != 0x15)
454 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
455 &tupleLength, tuple)) < 0)
457 if (tupleType != 0x20)
459 if (tupleLength != 4)
461 manfid = (tuple[1] << 8) | tuple[0];
462 devid = (tuple[3] << 8) | tuple[2];
467 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
468 &tupleLength, tuple)) < 0)
470 if (tupleType != 0x1A)
475 /* extract the configbase */
477 if (tupleLength < (3 + rasz + 14))
479 ca->slot_info[slot].config_base = 0;
480 for (i = 0; i < rasz + 1; i++) {
481 ca->slot_info[slot].config_base |= (tuple[2 + i] << (8 * i));
484 /* check it contains the correct DVB string */
485 dvb_str = findstr(tuple, tupleLength, "DVB_CI_V", 8);
488 if (tupleLength < ((dvb_str - (char *) tuple) + 12))
491 /* is it a version we support? */
492 if (strncmp(dvb_str + 8, "1.00", 4)) {
493 printk("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n",
494 ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9], dvb_str[10], dvb_str[11]);
498 /* process the CFTABLE_ENTRY tuples, and any after those */
499 while ((!end_chain) && (address < 0x1000)) {
500 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
501 &tupleLength, tuple)) < 0)
504 case 0x1B: // CISTPL_CFTABLE_ENTRY
505 if (tupleLength < (2 + 11 + 17))
508 /* if we've already parsed one, just use it */
509 if (got_cftableentry)
512 /* get the config option */
513 ca->slot_info[slot].config_option = tuple[0] & 0x3f;
515 /* OK, check it contains the correct strings */
516 if ((findstr(tuple, tupleLength, "DVB_HOST", 8) == NULL) ||
517 (findstr(tuple, tupleLength, "DVB_CI_MODULE", 13) == NULL))
520 got_cftableentry = 1;
523 case 0x14: // CISTPL_NO_LINK
526 case 0xFF: // CISTPL_END
530 default: /* Unknown tuple type - just skip this tuple and move to the next one */
531 dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n", tupleType,
537 if ((address > 0x1000) || (!got_cftableentry))
540 dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n",
541 manfid, devid, ca->slot_info[slot].config_base, ca->slot_info[slot].config_option);
549 * Set CAM's configoption correctly.
551 * @param ca CA instance.
552 * @param slot Slot containing the CAM.
554 static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot)
558 dprintk("%s\n", __FUNCTION__);
560 /* set the config option */
561 ca->pub->write_attribute_mem(ca->pub, slot,
562 ca->slot_info[slot].config_base,
563 ca->slot_info[slot].config_option);
566 configoption = ca->pub->read_attribute_mem(ca->pub, slot, ca->slot_info[slot].config_base);
567 dprintk("Set configoption 0x%x, read configoption 0x%x\n",
568 ca->slot_info[slot].config_option, configoption & 0x3f);
577 * This function talks to an EN50221 CAM control interface. It reads a buffer of
578 * data from the CAM. The data can either be stored in a supplied buffer, or
579 * automatically be added to the slot's rx_buffer.
581 * @param ca CA instance.
582 * @param slot Slot to read from.
583 * @param ebuf If non-NULL, the data will be written to this buffer. If NULL,
584 * the data will be added into the buffering system as a normal fragment.
585 * @param ecount Size of ebuf. Ignored if ebuf is NULL.
587 * @return Number of bytes read, or < 0 on error
589 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount)
593 u8 buf[HOST_LINK_BUF_SIZE];
596 dprintk("%s\n", __FUNCTION__);
598 /* check if we have space for a link buf in the rx_buffer */
602 if (ca->slot_info[slot].rx_buffer.data == NULL) {
606 buf_free = dvb_ringbuffer_free(&ca->slot_info[slot].rx_buffer);
608 if (buf_free < (ca->slot_info[slot].link_buf_size + DVB_RINGBUFFER_PKTHDRSIZE)) {
614 /* check if there is data available */
615 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
617 if (!(status & STATUSREG_DA)) {
623 /* read the amount of data */
624 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH)) < 0)
626 bytes_read = status << 8;
627 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW)) < 0)
629 bytes_read |= status;
631 /* check it will fit */
633 if (bytes_read > ca->slot_info[slot].link_buf_size) {
634 printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n",
635 ca->dvbdev->adapter->num, bytes_read, ca->slot_info[slot].link_buf_size);
636 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
640 if (bytes_read < 2) {
641 printk("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n",
642 ca->dvbdev->adapter->num);
643 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
648 if (bytes_read > ecount) {
649 printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n",
650 ca->dvbdev->adapter->num);
656 /* fill the buffer */
657 for (i = 0; i < bytes_read; i++) {
658 /* read byte and check */
659 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_DATA)) < 0)
662 /* OK, store it in the buffer */
666 /* check for read error (RE should now be 0) */
667 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
669 if (status & STATUSREG_RE) {
670 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
675 /* OK, add it to the receive buffer, or copy into external buffer if supplied */
677 if (ca->slot_info[slot].rx_buffer.data == NULL) {
681 dvb_ringbuffer_pkt_write(&ca->slot_info[slot].rx_buffer, buf, bytes_read);
683 memcpy(ebuf, buf, bytes_read);
686 dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot,
687 buf[0], (buf[1] & 0x80) == 0, bytes_read);
689 /* wake up readers when a last_fragment is received */
690 if ((buf[1] & 0x80) == 0x00) {
691 wake_up_interruptible(&ca->wait_queue);
701 * This function talks to an EN50221 CAM control interface. It writes a buffer of data
704 * @param ca CA instance.
705 * @param slot Slot to write to.
706 * @param ebuf The data in this buffer is treated as a complete link-level packet to
708 * @param count Size of ebuf.
710 * @return Number of bytes written, or < 0 on error.
712 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * buf, int bytes_write)
717 dprintk("%s\n", __FUNCTION__);
721 if (bytes_write > ca->slot_info[slot].link_buf_size)
724 /* check if interface is actually waiting for us to read from it, or if a read is in progress */
725 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
727 if (status & (STATUSREG_DA | STATUSREG_RE)) {
733 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
734 IRQEN | CMDREG_HC)) != 0)
737 /* check if interface is still free */
738 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
740 if (!(status & STATUSREG_FR)) {
741 /* it wasn't free => try again later */
746 /* send the amount of data */
747 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, bytes_write >> 8)) != 0)
749 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW,
750 bytes_write & 0xff)) != 0)
753 /* send the buffer */
754 for (i = 0; i < bytes_write; i++) {
755 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, buf[i])) != 0)
759 /* check for write error (WE should now be 0) */
760 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
762 if (status & STATUSREG_WE) {
763 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
767 status = bytes_write;
769 dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot,
770 buf[0], (buf[1] & 0x80) == 0, bytes_write);
773 ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
778 EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq);
782 /* ******************************************************************************** */
783 /* EN50221 higher level functions */
787 * A CAM has been removed => shut it down.
789 * @param ca CA instance.
790 * @param slot Slot to shut down.
792 static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot)
794 dprintk("%s\n", __FUNCTION__);
796 ca->pub->slot_shutdown(ca->pub, slot);
797 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
799 /* need to wake up all processes to check if they're now
800 trying to write to a defunct CAM */
801 wake_up_interruptible(&ca->wait_queue);
803 dprintk("Slot %i shutdown\n", slot);
808 EXPORT_SYMBOL(dvb_ca_en50221_camready_irq);
812 * A CAMCHANGE IRQ has occurred.
814 * @param ca CA instance.
815 * @param slot Slot concerned.
816 * @param change_type One of the DVB_CA_CAMCHANGE_* values.
818 void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot, int change_type)
820 struct dvb_ca_private *ca = pubca->private;
822 dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type);
824 switch (change_type) {
825 case DVB_CA_EN50221_CAMCHANGE_REMOVED:
826 case DVB_CA_EN50221_CAMCHANGE_INSERTED:
833 ca->slot_info[slot].camchange_type = change_type;
834 atomic_inc(&ca->slot_info[slot].camchange_count);
835 dvb_ca_en50221_thread_wakeup(ca);
837 EXPORT_SYMBOL(dvb_ca_en50221_frda_irq);
841 * A CAMREADY IRQ has occurred.
843 * @param ca CA instance.
844 * @param slot Slot concerned.
846 void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot)
848 struct dvb_ca_private *ca = pubca->private;
850 dprintk("CAMREADY IRQ slot:%i\n", slot);
852 if (ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) {
853 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
854 dvb_ca_en50221_thread_wakeup(ca);
860 * An FR or DA IRQ has occurred.
862 * @param ca CA instance.
863 * @param slot Slot concerned.
865 void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot)
867 struct dvb_ca_private *ca = pubca->private;
870 dprintk("FR/DA IRQ slot:%i\n", slot);
872 switch (ca->slot_info[slot].slot_state) {
873 case DVB_CA_SLOTSTATE_LINKINIT:
874 flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS);
875 if (flags & STATUSREG_DA) {
876 dprintk("CAM supports DA IRQ\n");
877 ca->slot_info[slot].da_irq_supported = 1;
881 case DVB_CA_SLOTSTATE_RUNNING:
883 dvb_ca_en50221_thread_wakeup(ca);
890 /* ******************************************************************************** */
891 /* EN50221 thread functions */
894 * Wake up the DVB CA thread
896 * @param ca CA instance.
898 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca)
901 dprintk("%s\n", __FUNCTION__);
905 wake_up_interruptible(&ca->thread_queue);
909 * Used by the CA thread to determine if an early wakeup is necessary
911 * @param ca CA instance.
913 static int dvb_ca_en50221_thread_should_wakeup(struct dvb_ca_private *ca)
927 * Update the delay used by the thread.
929 * @param ca CA instance.
931 static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca)
934 int curdelay = 100000000;
937 for (slot = 0; slot < ca->slot_count; slot++) {
938 switch (ca->slot_info[slot].slot_state) {
940 case DVB_CA_SLOTSTATE_NONE:
941 case DVB_CA_SLOTSTATE_INVALID:
943 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) {
948 case DVB_CA_SLOTSTATE_UNINITIALISED:
949 case DVB_CA_SLOTSTATE_WAITREADY:
950 case DVB_CA_SLOTSTATE_VALIDATE:
951 case DVB_CA_SLOTSTATE_WAITFR:
952 case DVB_CA_SLOTSTATE_LINKINIT:
956 case DVB_CA_SLOTSTATE_RUNNING:
958 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) {
962 if ((!ca->slot_info[slot].da_irq_supported) ||
963 (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA))) {
970 if (delay < curdelay)
974 ca->delay = curdelay;
980 * Kernel thread which monitors CA slots for CAM changes, and performs data transfers.
982 static int dvb_ca_en50221_thread(void *data)
984 struct dvb_ca_private *ca = data;
992 dprintk("%s\n", __FUNCTION__);
994 /* setup kernel thread */
995 snprintf(name, sizeof(name), "kdvb-ca-%i:%i", ca->dvbdev->adapter->num, ca->dvbdev->id);
999 sigfillset(¤t->blocked);
1002 /* choose the correct initial delay */
1003 dvb_ca_en50221_thread_update_delay(ca);
1007 /* sleep for a bit */
1009 flags = wait_event_interruptible_timeout(ca->thread_queue,
1010 dvb_ca_en50221_thread_should_wakeup(ca),
1012 if ((flags == -ERESTARTSYS) || ca->exit) {
1013 /* got signal or quitting */
1019 /* go through all the slots processing them */
1020 for (slot = 0; slot < ca->slot_count; slot++) {
1022 // check the cam status + deal with CAMCHANGEs
1023 while (dvb_ca_en50221_check_camstatus(ca, slot)) {
1024 /* clear down an old CI slot if necessary */
1025 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE)
1026 dvb_ca_en50221_slot_shutdown(ca, slot);
1028 /* if a CAM is NOW present, initialise it */
1029 if (ca->slot_info[slot].camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) {
1030 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_UNINITIALISED;
1033 /* we've handled one CAMCHANGE */
1034 dvb_ca_en50221_thread_update_delay(ca);
1035 atomic_dec(&ca->slot_info[slot].camchange_count);
1038 // CAM state machine
1039 switch (ca->slot_info[slot].slot_state) {
1040 case DVB_CA_SLOTSTATE_NONE:
1041 case DVB_CA_SLOTSTATE_INVALID:
1045 case DVB_CA_SLOTSTATE_UNINITIALISED:
1046 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITREADY;
1047 ca->pub->slot_reset(ca->pub, slot);
1048 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1051 case DVB_CA_SLOTSTATE_WAITREADY:
1052 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1053 printk("dvb_ca adaptor %d: PC card did not respond :(\n",
1054 ca->dvbdev->adapter->num);
1055 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1056 dvb_ca_en50221_thread_update_delay(ca);
1059 // no other action needed; will automatically change state when ready
1062 case DVB_CA_SLOTSTATE_VALIDATE:
1063 if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) {
1064 /* we need this extra check for annoying interfaces like the budget-av */
1065 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1066 (ca->pub->poll_slot_status)) {
1067 int status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1068 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1069 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1070 dvb_ca_en50221_thread_update_delay(ca);
1075 printk("dvb_ca adapter %d: Invalid PC card inserted :(\n",
1076 ca->dvbdev->adapter->num);
1077 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1078 dvb_ca_en50221_thread_update_delay(ca);
1081 if (dvb_ca_en50221_set_configoption(ca, slot) != 0) {
1082 printk("dvb_ca adapter %d: Unable to initialise CAM :(\n",
1083 ca->dvbdev->adapter->num);
1084 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1085 dvb_ca_en50221_thread_update_delay(ca);
1088 if (ca->pub->write_cam_control(ca->pub, slot,
1089 CTRLIF_COMMAND, CMDREG_RS) != 0) {
1090 printk("dvb_ca adapter %d: Unable to reset CAM IF\n",
1091 ca->dvbdev->adapter->num);
1092 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1093 dvb_ca_en50221_thread_update_delay(ca);
1096 dprintk("DVB CAM validated successfully\n");
1098 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1099 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITFR;
1103 case DVB_CA_SLOTSTATE_WAITFR:
1104 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1105 printk("dvb_ca adapter %d: DVB CAM did not respond :(\n",
1106 ca->dvbdev->adapter->num);
1107 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1108 dvb_ca_en50221_thread_update_delay(ca);
1112 flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
1113 if (flags & STATUSREG_FR) {
1114 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
1119 case DVB_CA_SLOTSTATE_LINKINIT:
1120 if (dvb_ca_en50221_link_init(ca, slot) != 0) {
1121 /* we need this extra check for annoying interfaces like the budget-av */
1122 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1123 (ca->pub->poll_slot_status)) {
1124 int status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1125 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1126 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1127 dvb_ca_en50221_thread_update_delay(ca);
1132 printk("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n", ca->dvbdev->adapter->num);
1133 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1134 dvb_ca_en50221_thread_update_delay(ca);
1138 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1139 rxbuf = vmalloc(RX_BUFFER_SIZE);
1140 if (rxbuf == NULL) {
1141 printk("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n", ca->dvbdev->adapter->num);
1142 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1143 dvb_ca_en50221_thread_update_delay(ca);
1146 dvb_ringbuffer_init(&ca->slot_info[slot].rx_buffer, rxbuf, RX_BUFFER_SIZE);
1149 ca->pub->slot_ts_enable(ca->pub, slot);
1150 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_RUNNING;
1151 dvb_ca_en50221_thread_update_delay(ca);
1152 printk("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n", ca->dvbdev->adapter->num);
1155 case DVB_CA_SLOTSTATE_RUNNING:
1159 // poll slots for data
1161 while ((status = dvb_ca_en50221_read_data(ca, slot, NULL, 0)) > 0) {
1165 /* if a CAMCHANGE occurred at some point, do not do any more processing of this slot */
1166 if (dvb_ca_en50221_check_camstatus(ca, slot)) {
1167 // we dont want to sleep on the next iteration so we can handle the cam change
1172 /* check if we've hit our limit this time */
1173 if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) {
1174 // dont sleep; there is likely to be more data to read
1187 wake_up_interruptible(&ca->thread_queue);
1193 /* ******************************************************************************** */
1194 /* EN50221 IO interface functions */
1197 * Real ioctl implementation.
1198 * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them.
1200 * @param inode Inode concerned.
1201 * @param file File concerned.
1202 * @param cmd IOCTL command.
1203 * @param arg Associated argument.
1205 * @return 0 on success, <0 on error.
1207 static int dvb_ca_en50221_io_do_ioctl(struct inode *inode, struct file *file,
1208 unsigned int cmd, void *parg)
1210 struct dvb_device *dvbdev = file->private_data;
1211 struct dvb_ca_private *ca = dvbdev->priv;
1215 dprintk("%s\n", __FUNCTION__);
1219 for (slot = 0; slot < ca->slot_count; slot++) {
1220 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) {
1221 dvb_ca_en50221_slot_shutdown(ca, slot);
1222 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)
1223 dvb_ca_en50221_camchange_irq(ca->pub,
1225 DVB_CA_EN50221_CAMCHANGE_INSERTED);
1228 ca->next_read_slot = 0;
1229 dvb_ca_en50221_thread_wakeup(ca);
1233 struct ca_caps *caps = parg;
1235 caps->slot_num = ca->slot_count;
1236 caps->slot_type = CA_CI_LINK;
1237 caps->descr_num = 0;
1238 caps->descr_type = 0;
1242 case CA_GET_SLOT_INFO: {
1243 struct ca_slot_info *info = parg;
1245 if ((info->num > ca->slot_count) || (info->num < 0))
1248 info->type = CA_CI_LINK;
1250 if ((ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_NONE)
1251 && (ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_INVALID)) {
1252 info->flags = CA_CI_MODULE_PRESENT;
1254 if (ca->slot_info[info->num].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1255 info->flags |= CA_CI_MODULE_READY;
1270 * Wrapper for ioctl implementation.
1272 * @param inode Inode concerned.
1273 * @param file File concerned.
1274 * @param cmd IOCTL command.
1275 * @param arg Associated argument.
1277 * @return 0 on success, <0 on error.
1279 static int dvb_ca_en50221_io_ioctl(struct inode *inode, struct file *file,
1280 unsigned int cmd, unsigned long arg)
1282 return dvb_usercopy(inode, file, cmd, arg, dvb_ca_en50221_io_do_ioctl);
1287 * Implementation of write() syscall.
1289 * @param file File structure.
1290 * @param buf Source buffer.
1291 * @param count Size of source buffer.
1292 * @param ppos Position in file (ignored).
1294 * @return Number of bytes read, or <0 on error.
1296 static ssize_t dvb_ca_en50221_io_write(struct file *file,
1297 const char __user * buf, size_t count, loff_t * ppos)
1299 struct dvb_device *dvbdev = file->private_data;
1300 struct dvb_ca_private *ca = dvbdev->priv;
1301 u8 slot, connection_id;
1303 char fragbuf[HOST_LINK_BUF_SIZE];
1306 unsigned long timeout;
1309 dprintk("%s\n", __FUNCTION__);
1311 /* Incoming packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1315 /* extract slot & connection id */
1316 if (copy_from_user(&slot, buf, 1))
1318 if (copy_from_user(&connection_id, buf + 1, 1))
1323 /* check if the slot is actually running */
1324 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1327 /* fragment the packets & store in the buffer */
1328 while (fragpos < count) {
1329 fraglen = ca->slot_info[slot].link_buf_size - 2;
1330 if ((count - fragpos) < fraglen)
1331 fraglen = count - fragpos;
1333 fragbuf[0] = connection_id;
1334 fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00;
1335 if ((status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen)) != 0)
1338 timeout = jiffies + HZ / 2;
1340 while (!time_after(jiffies, timeout)) {
1341 /* check the CAM hasn't been removed/reset in the meantime */
1342 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) {
1347 status = dvb_ca_en50221_write_data(ca, slot, fragbuf, fraglen + 2);
1348 if (status == (fraglen + 2)) {
1352 if (status != -EAGAIN)
1372 * Condition for waking up in dvb_ca_en50221_io_read_condition
1374 static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca,
1375 int *result, int *_slot)
1381 int connection_id = -1;
1385 slot = ca->next_read_slot;
1386 while ((slot_count < ca->slot_count) && (!found)) {
1387 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1390 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1394 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1396 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2, 0);
1397 if (connection_id == -1)
1398 connection_id = hdr[0];
1399 if ((hdr[0] == connection_id) && ((hdr[1] & 0x80) == 0)) {
1405 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1409 slot = (slot + 1) % ca->slot_count;
1413 ca->next_read_slot = slot;
1419 * Implementation of read() syscall.
1421 * @param file File structure.
1422 * @param buf Destination buffer.
1423 * @param count Size of destination buffer.
1424 * @param ppos Position in file (ignored).
1426 * @return Number of bytes read, or <0 on error.
1428 static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user * buf,
1429 size_t count, loff_t * ppos)
1431 struct dvb_device *dvbdev = file->private_data;
1432 struct dvb_ca_private *ca = dvbdev->priv;
1437 int connection_id = -1;
1439 int last_fragment = 0;
1444 dprintk("%s\n", __FUNCTION__);
1446 /* Outgoing packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1450 /* wait for some data */
1451 if ((status = dvb_ca_en50221_io_read_condition(ca, &result, &slot)) == 0) {
1453 /* if we're in nonblocking mode, exit immediately */
1454 if (file->f_flags & O_NONBLOCK)
1455 return -EWOULDBLOCK;
1457 /* wait for some data */
1458 status = wait_event_interruptible(ca->wait_queue,
1459 dvb_ca_en50221_io_read_condition
1460 (ca, &result, &slot));
1462 if ((status < 0) || (result < 0)) {
1468 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1472 printk("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n", ca->dvbdev->adapter->num);
1477 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2, 0);
1478 if (connection_id == -1)
1479 connection_id = hdr[0];
1480 if (hdr[0] == connection_id) {
1481 if (pktlen < count) {
1482 if ((pktlen + fraglen - 2) > count) {
1483 fraglen = count - pktlen;
1488 if ((status = dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 2,
1489 buf + pktlen, fraglen, 1)) < 0) {
1495 if ((hdr[1] & 0x80) == 0)
1500 idx2 = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1502 dvb_ringbuffer_pkt_dispose(&ca->slot_info[slot].rx_buffer, idx);
1505 } while (!last_fragment);
1508 hdr[1] = connection_id;
1509 if ((status = copy_to_user(buf, hdr, 2)) != 0)
1519 * Implementation of file open syscall.
1521 * @param inode Inode concerned.
1522 * @param file File concerned.
1524 * @return 0 on success, <0 on failure.
1526 static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file)
1528 struct dvb_device *dvbdev = file->private_data;
1529 struct dvb_ca_private *ca = dvbdev->priv;
1533 dprintk("%s\n", __FUNCTION__);
1535 if (!try_module_get(ca->pub->owner))
1538 err = dvb_generic_open(inode, file);
1542 for (i = 0; i < ca->slot_count; i++) {
1544 if (ca->slot_info[i].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1545 if (ca->slot_info[i].rx_buffer.data != NULL) {
1546 /* it is safe to call this here without locks because
1547 * ca->open == 0. Data is not read in this case */
1548 dvb_ringbuffer_flush(&ca->slot_info[i].rx_buffer);
1554 dvb_ca_en50221_thread_update_delay(ca);
1555 dvb_ca_en50221_thread_wakeup(ca);
1562 * Implementation of file close syscall.
1564 * @param inode Inode concerned.
1565 * @param file File concerned.
1567 * @return 0 on success, <0 on failure.
1569 static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file)
1571 struct dvb_device *dvbdev = file->private_data;
1572 struct dvb_ca_private *ca = dvbdev->priv;
1575 dprintk("%s\n", __FUNCTION__);
1577 /* mark the CA device as closed */
1579 dvb_ca_en50221_thread_update_delay(ca);
1581 err = dvb_generic_release(inode, file);
1583 module_put(ca->pub->owner);
1590 * Implementation of poll() syscall.
1592 * @param file File concerned.
1593 * @param wait poll wait table.
1595 * @return Standard poll mask.
1597 static unsigned int dvb_ca_en50221_io_poll(struct file *file, poll_table * wait)
1599 struct dvb_device *dvbdev = file->private_data;
1600 struct dvb_ca_private *ca = dvbdev->priv;
1601 unsigned int mask = 0;
1605 dprintk("%s\n", __FUNCTION__);
1607 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1611 /* if there is something, return now */
1615 /* wait for something to happen */
1616 poll_wait(file, &ca->wait_queue, wait);
1618 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1624 EXPORT_SYMBOL(dvb_ca_en50221_init);
1627 static struct file_operations dvb_ca_fops = {
1628 .owner = THIS_MODULE,
1629 .read = dvb_ca_en50221_io_read,
1630 .write = dvb_ca_en50221_io_write,
1631 .ioctl = dvb_ca_en50221_io_ioctl,
1632 .open = dvb_ca_en50221_io_open,
1633 .release = dvb_ca_en50221_io_release,
1634 .poll = dvb_ca_en50221_io_poll,
1637 static struct dvb_device dvbdev_ca = {
1642 .fops = &dvb_ca_fops,
1646 /* ******************************************************************************** */
1647 /* Initialisation/shutdown functions */
1651 * Initialise a new DVB CA EN50221 interface device.
1653 * @param dvb_adapter DVB adapter to attach the new CA device to.
1654 * @param ca The dvb_ca instance.
1655 * @param flags Flags describing the CA device (DVB_CA_FLAG_*).
1656 * @param slot_count Number of slots supported.
1658 * @return 0 on success, nonzero on failure
1660 int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter,
1661 struct dvb_ca_en50221 *pubca, int flags, int slot_count)
1664 struct dvb_ca_private *ca = NULL;
1667 dprintk("%s\n", __FUNCTION__);
1672 /* initialise the system data */
1673 if ((ca = kzalloc(sizeof(struct dvb_ca_private), GFP_KERNEL)) == NULL) {
1679 ca->slot_count = slot_count;
1680 if ((ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot), GFP_KERNEL)) == NULL) {
1684 init_waitqueue_head(&ca->wait_queue);
1686 init_waitqueue_head(&ca->thread_queue);
1690 ca->next_read_slot = 0;
1691 pubca->private = ca;
1693 /* register the DVB device */
1694 ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, DVB_DEVICE_CA);
1698 /* now initialise each slot */
1699 for (i = 0; i < slot_count; i++) {
1700 memset(&ca->slot_info[i], 0, sizeof(struct dvb_ca_slot));
1701 ca->slot_info[i].slot_state = DVB_CA_SLOTSTATE_NONE;
1702 atomic_set(&ca->slot_info[i].camchange_count, 0);
1703 ca->slot_info[i].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
1706 if (signal_pending(current)) {
1712 /* create a kthread for monitoring this CA device */
1714 ret = kernel_thread(dvb_ca_en50221_thread, ca, 0);
1717 printk("dvb_ca_init: failed to start kernel_thread (%d)\n", ret);
1720 ca->thread_pid = ret;
1725 if (ca->dvbdev != NULL)
1726 dvb_unregister_device(ca->dvbdev);
1727 kfree(ca->slot_info);
1730 pubca->private = NULL;
1733 EXPORT_SYMBOL(dvb_ca_en50221_release);
1738 * Release a DVB CA EN50221 interface device.
1740 * @param ca_dev The dvb_device_t instance for the CA device.
1741 * @param ca The associated dvb_ca instance.
1743 void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca)
1745 struct dvb_ca_private *ca = pubca->private;
1748 dprintk("%s\n", __FUNCTION__);
1750 /* shutdown the thread if there was one */
1751 if (ca->thread_pid) {
1752 if (kill_proc(ca->thread_pid, 0, 1) == -ESRCH) {
1753 printk("dvb_ca_release adapter %d: thread PID %d already died\n",
1754 ca->dvbdev->adapter->num, ca->thread_pid);
1758 dvb_ca_en50221_thread_wakeup(ca);
1759 wait_event_interruptible(ca->thread_queue, ca->thread_pid == 0);
1763 for (i = 0; i < ca->slot_count; i++) {
1764 dvb_ca_en50221_slot_shutdown(ca, i);
1765 vfree(ca->slot_info[i].rx_buffer.data);
1767 kfree(ca->slot_info);
1768 dvb_unregister_device(ca->dvbdev);
1770 pubca->private = NULL;