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/rwsem.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 /* semaphore for syncing access to slot structure */
115 struct rw_semaphore sem;
117 /* buffer for incoming packets */
118 struct dvb_ringbuffer rx_buffer;
120 /* timer used during various states of the slot */
121 unsigned long timeout;
124 /* Private CA-interface information */
125 struct dvb_ca_private {
127 /* pointer back to the public data structure */
128 struct dvb_ca_en50221 *pub;
131 struct dvb_device *dvbdev;
133 /* Flags describing the interface (DVB_CA_FLAG_*) */
136 /* number of slots supported by this CA interface */
137 unsigned int slot_count;
139 /* information on each slot */
140 struct dvb_ca_slot *slot_info;
142 /* wait queues for read() and write() operations */
143 wait_queue_head_t wait_queue;
145 /* PID of the monitoring thread */
148 /* Wait queue used when shutting thread down */
149 wait_queue_head_t thread_queue;
151 /* Flag indicating when thread should exit */
154 /* Flag indicating if the CA device is open */
157 /* Flag indicating the thread should wake up now */
158 unsigned int wakeup:1;
160 /* Delay the main thread should use */
163 /* Slot to start looking for data to read from in the next user-space read operation */
167 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca);
168 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount);
169 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount);
173 * Safely find needle in haystack.
175 * @param haystack Buffer to look in.
176 * @param hlen Number of bytes in haystack.
177 * @param needle Buffer to find.
178 * @param nlen Number of bytes in needle.
179 * @return Pointer into haystack needle was found at, or NULL if not found.
181 static u8 *findstr(u8 * haystack, int hlen, u8 * needle, int nlen)
188 for (i = 0; i <= hlen - nlen; i++) {
189 if (!strncmp(haystack + i, needle, nlen))
198 /* ******************************************************************************** */
199 /* EN50221 physical interface functions */
205 static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot)
212 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) {
213 return (atomic_read(&ca->slot_info[slot].camchange_count) != 0);
217 slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open);
219 cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0;
220 cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0;
222 int cam_present_old = (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE);
223 cam_changed = (cam_present_now != cam_present_old);
227 if (!cam_present_now) {
228 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
230 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED;
232 atomic_set(&ca->slot_info[slot].camchange_count, 1);
234 if ((ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) &&
235 (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) {
236 // move to validate state if reset is completed
237 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
246 * Wait for flags to become set on the STATUS register on a CAM interface,
247 * checking for errors and timeout.
249 * @param ca CA instance.
250 * @param slot Slot on interface.
251 * @param waitfor Flags to wait for.
252 * @param timeout_ms Timeout in milliseconds.
254 * @return 0 on success, nonzero on error.
256 static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot,
257 u8 waitfor, int timeout_hz)
259 unsigned long timeout;
262 dprintk("%s\n", __FUNCTION__);
264 /* loop until timeout elapsed */
266 timeout = jiffies + timeout_hz;
268 /* read the status and check for error */
269 int res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
273 /* if we got the flags, it was successful! */
275 dprintk("%s succeeded timeout:%lu\n", __FUNCTION__, jiffies - start);
279 /* check for timeout */
280 if (time_after(jiffies, timeout)) {
288 dprintk("%s failed timeout:%lu\n", __FUNCTION__, jiffies - start);
290 /* if we get here, we've timed out */
296 * Initialise the link layer connection to a CAM.
298 * @param ca CA instance.
299 * @param slot Slot id.
301 * @return 0 on success, nonzero on failure.
303 static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot)
309 dprintk("%s\n", __FUNCTION__);
311 /* we'll be determining these during this function */
312 ca->slot_info[slot].da_irq_supported = 0;
314 /* set the host link buffer size temporarily. it will be overwritten with the
315 * real negotiated size later. */
316 ca->slot_info[slot].link_buf_size = 2;
318 /* read the buffer size from the CAM */
319 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SR)) != 0)
321 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ / 10)) != 0)
323 if ((ret = dvb_ca_en50221_read_data(ca, slot, buf, 2)) != 2)
325 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
328 /* store it, and choose the minimum of our buffer and the CAM's buffer size */
329 buf_size = (buf[0] << 8) | buf[1];
330 if (buf_size > HOST_LINK_BUF_SIZE)
331 buf_size = HOST_LINK_BUF_SIZE;
332 ca->slot_info[slot].link_buf_size = buf_size;
333 buf[0] = buf_size >> 8;
334 buf[1] = buf_size & 0xff;
335 dprintk("Chosen link buffer size of %i\n", buf_size);
337 /* write the buffer size to the CAM */
338 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SW)) != 0)
340 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10)) != 0)
342 if ((ret = dvb_ca_en50221_write_data(ca, slot, buf, 2)) != 2)
344 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
352 * Read a tuple from attribute memory.
354 * @param ca CA instance.
355 * @param slot Slot id.
356 * @param address Address to read from. Updated.
357 * @param tupleType Tuple id byte. Updated.
358 * @param tupleLength Tuple length. Updated.
359 * @param tuple Dest buffer for tuple (must be 256 bytes). Updated.
361 * @return 0 on success, nonzero on error.
363 static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot,
364 int *address, int *tupleType, int *tupleLength, u8 * tuple)
369 int _address = *address;
371 /* grab the next tuple length and type */
372 if ((_tupleType = ca->pub->read_attribute_mem(ca->pub, slot, _address)) < 0)
374 if (_tupleType == 0xff) {
375 dprintk("END OF CHAIN TUPLE type:0x%x\n", _tupleType);
377 *tupleType = _tupleType;
381 if ((_tupleLength = ca->pub->read_attribute_mem(ca->pub, slot, _address + 2)) < 0)
385 dprintk("TUPLE type:0x%x length:%i\n", _tupleType, _tupleLength);
387 /* read in the whole tuple */
388 for (i = 0; i < _tupleLength; i++) {
389 tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, _address + (i * 2));
390 dprintk(" 0x%02x: 0x%02x %c\n",
392 ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.');
394 _address += (_tupleLength * 2);
397 *tupleType = _tupleType;
398 *tupleLength = _tupleLength;
405 * Parse attribute memory of a CAM module, extracting Config register, and checking
406 * it is a DVB CAM module.
408 * @param ca CA instance.
409 * @param slot Slot id.
411 * @return 0 on success, <0 on failure.
413 static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot)
422 int got_cftableentry = 0;
431 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
433 if (tupleType != 0x1D)
440 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
442 if (tupleType != 0x1C)
449 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
451 if (tupleType != 0x15)
457 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
458 &tupleLength, tuple)) < 0)
460 if (tupleType != 0x20)
462 if (tupleLength != 4)
464 manfid = (tuple[1] << 8) | tuple[0];
465 devid = (tuple[3] << 8) | tuple[2];
470 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
471 &tupleLength, tuple)) < 0)
473 if (tupleType != 0x1A)
478 /* extract the configbase */
480 if (tupleLength < (3 + rasz + 14))
482 ca->slot_info[slot].config_base = 0;
483 for (i = 0; i < rasz + 1; i++) {
484 ca->slot_info[slot].config_base |= (tuple[2 + i] << (8 * i));
487 /* check it contains the correct DVB string */
488 dvb_str = findstr(tuple, tupleLength, "DVB_CI_V", 8);
491 if (tupleLength < ((dvb_str - (char *) tuple) + 12))
494 /* is it a version we support? */
495 if (strncmp(dvb_str + 8, "1.00", 4)) {
496 printk("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n",
497 ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9], dvb_str[10], dvb_str[11]);
501 /* process the CFTABLE_ENTRY tuples, and any after those */
502 while ((!end_chain) && (address < 0x1000)) {
503 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
504 &tupleLength, tuple)) < 0)
507 case 0x1B: // CISTPL_CFTABLE_ENTRY
508 if (tupleLength < (2 + 11 + 17))
511 /* if we've already parsed one, just use it */
512 if (got_cftableentry)
515 /* get the config option */
516 ca->slot_info[slot].config_option = tuple[0] & 0x3f;
518 /* OK, check it contains the correct strings */
519 if ((findstr(tuple, tupleLength, "DVB_HOST", 8) == NULL) ||
520 (findstr(tuple, tupleLength, "DVB_CI_MODULE", 13) == NULL))
523 got_cftableentry = 1;
526 case 0x14: // CISTPL_NO_LINK
529 case 0xFF: // CISTPL_END
533 default: /* Unknown tuple type - just skip this tuple and move to the next one */
534 dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n", tupleType,
540 if ((address > 0x1000) || (!got_cftableentry))
543 dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n",
544 manfid, devid, ca->slot_info[slot].config_base, ca->slot_info[slot].config_option);
552 * Set CAM's configoption correctly.
554 * @param ca CA instance.
555 * @param slot Slot containing the CAM.
557 static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot)
561 dprintk("%s\n", __FUNCTION__);
563 /* set the config option */
564 ca->pub->write_attribute_mem(ca->pub, slot,
565 ca->slot_info[slot].config_base,
566 ca->slot_info[slot].config_option);
569 configoption = ca->pub->read_attribute_mem(ca->pub, slot, ca->slot_info[slot].config_base);
570 dprintk("Set configoption 0x%x, read configoption 0x%x\n",
571 ca->slot_info[slot].config_option, configoption & 0x3f);
580 * This function talks to an EN50221 CAM control interface. It reads a buffer of
581 * data from the CAM. The data can either be stored in a supplied buffer, or
582 * automatically be added to the slot's rx_buffer.
584 * @param ca CA instance.
585 * @param slot Slot to read from.
586 * @param ebuf If non-NULL, the data will be written to this buffer. If NULL,
587 * the data will be added into the buffering system as a normal fragment.
588 * @param ecount Size of ebuf. Ignored if ebuf is NULL.
590 * @return Number of bytes read, or < 0 on error
592 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount)
596 u8 buf[HOST_LINK_BUF_SIZE];
599 dprintk("%s\n", __FUNCTION__);
601 /* check if we have space for a link buf in the rx_buffer */
605 down_read(&ca->slot_info[slot].sem);
606 if (ca->slot_info[slot].rx_buffer.data == NULL) {
607 up_read(&ca->slot_info[slot].sem);
611 buf_free = dvb_ringbuffer_free(&ca->slot_info[slot].rx_buffer);
612 up_read(&ca->slot_info[slot].sem);
614 if (buf_free < (ca->slot_info[slot].link_buf_size + DVB_RINGBUFFER_PKTHDRSIZE)) {
620 /* check if there is data available */
621 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
623 if (!(status & STATUSREG_DA)) {
629 /* read the amount of data */
630 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH)) < 0)
632 bytes_read = status << 8;
633 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW)) < 0)
635 bytes_read |= status;
637 /* check it will fit */
639 if (bytes_read > ca->slot_info[slot].link_buf_size) {
640 printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n",
641 ca->dvbdev->adapter->num, bytes_read, ca->slot_info[slot].link_buf_size);
642 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
646 if (bytes_read < 2) {
647 printk("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n",
648 ca->dvbdev->adapter->num);
649 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
654 if (bytes_read > ecount) {
655 printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n",
656 ca->dvbdev->adapter->num);
662 /* fill the buffer */
663 for (i = 0; i < bytes_read; i++) {
664 /* read byte and check */
665 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_DATA)) < 0)
668 /* OK, store it in the buffer */
672 /* check for read error (RE should now be 0) */
673 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
675 if (status & STATUSREG_RE) {
676 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
681 /* OK, add it to the receive buffer, or copy into external buffer if supplied */
683 down_read(&ca->slot_info[slot].sem);
684 if (ca->slot_info[slot].rx_buffer.data == NULL) {
685 up_read(&ca->slot_info[slot].sem);
689 dvb_ringbuffer_pkt_write(&ca->slot_info[slot].rx_buffer, buf, bytes_read);
690 up_read(&ca->slot_info[slot].sem);
692 memcpy(ebuf, buf, bytes_read);
695 dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot,
696 buf[0], (buf[1] & 0x80) == 0, bytes_read);
698 /* wake up readers when a last_fragment is received */
699 if ((buf[1] & 0x80) == 0x00) {
700 wake_up_interruptible(&ca->wait_queue);
710 * This function talks to an EN50221 CAM control interface. It writes a buffer of data
713 * @param ca CA instance.
714 * @param slot Slot to write to.
715 * @param ebuf The data in this buffer is treated as a complete link-level packet to
717 * @param count Size of ebuf.
719 * @return Number of bytes written, or < 0 on error.
721 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * buf, int bytes_write)
726 dprintk("%s\n", __FUNCTION__);
730 if (bytes_write > ca->slot_info[slot].link_buf_size)
733 /* check if interface is actually waiting for us to read from it, or if a read is in progress */
734 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
736 if (status & (STATUSREG_DA | STATUSREG_RE)) {
742 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
743 IRQEN | CMDREG_HC)) != 0)
746 /* check if interface is still free */
747 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
749 if (!(status & STATUSREG_FR)) {
750 /* it wasn't free => try again later */
755 /* send the amount of data */
756 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, bytes_write >> 8)) != 0)
758 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW,
759 bytes_write & 0xff)) != 0)
762 /* send the buffer */
763 for (i = 0; i < bytes_write; i++) {
764 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, buf[i])) != 0)
768 /* check for write error (WE should now be 0) */
769 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
771 if (status & STATUSREG_WE) {
772 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
776 status = bytes_write;
778 dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot,
779 buf[0], (buf[1] & 0x80) == 0, bytes_write);
782 ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
787 EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq);
791 /* ******************************************************************************** */
792 /* EN50221 higher level functions */
796 * A CAM has been removed => shut it down.
798 * @param ca CA instance.
799 * @param slot Slot to shut down.
801 static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot)
803 dprintk("%s\n", __FUNCTION__);
805 down_write(&ca->slot_info[slot].sem);
806 ca->pub->slot_shutdown(ca->pub, slot);
807 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
808 vfree(ca->slot_info[slot].rx_buffer.data);
809 ca->slot_info[slot].rx_buffer.data = NULL;
810 up_write(&ca->slot_info[slot].sem);
812 /* need to wake up all processes to check if they're now
813 trying to write to a defunct CAM */
814 wake_up_interruptible(&ca->wait_queue);
816 dprintk("Slot %i shutdown\n", slot);
821 EXPORT_SYMBOL(dvb_ca_en50221_camready_irq);
825 * A CAMCHANGE IRQ has occurred.
827 * @param ca CA instance.
828 * @param slot Slot concerned.
829 * @param change_type One of the DVB_CA_CAMCHANGE_* values.
831 void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot, int change_type)
833 struct dvb_ca_private *ca = pubca->private;
835 dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type);
837 switch (change_type) {
838 case DVB_CA_EN50221_CAMCHANGE_REMOVED:
839 case DVB_CA_EN50221_CAMCHANGE_INSERTED:
846 ca->slot_info[slot].camchange_type = change_type;
847 atomic_inc(&ca->slot_info[slot].camchange_count);
848 dvb_ca_en50221_thread_wakeup(ca);
850 EXPORT_SYMBOL(dvb_ca_en50221_frda_irq);
854 * A CAMREADY IRQ has occurred.
856 * @param ca CA instance.
857 * @param slot Slot concerned.
859 void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot)
861 struct dvb_ca_private *ca = pubca->private;
863 dprintk("CAMREADY IRQ slot:%i\n", slot);
865 if (ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) {
866 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
867 dvb_ca_en50221_thread_wakeup(ca);
873 * An FR or DA IRQ has occurred.
875 * @param ca CA instance.
876 * @param slot Slot concerned.
878 void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot)
880 struct dvb_ca_private *ca = pubca->private;
883 dprintk("FR/DA IRQ slot:%i\n", slot);
885 switch (ca->slot_info[slot].slot_state) {
886 case DVB_CA_SLOTSTATE_LINKINIT:
887 flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS);
888 if (flags & STATUSREG_DA) {
889 dprintk("CAM supports DA IRQ\n");
890 ca->slot_info[slot].da_irq_supported = 1;
894 case DVB_CA_SLOTSTATE_RUNNING:
896 dvb_ca_en50221_read_data(ca, slot, NULL, 0);
903 /* ******************************************************************************** */
904 /* EN50221 thread functions */
907 * Wake up the DVB CA thread
909 * @param ca CA instance.
911 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca)
914 dprintk("%s\n", __FUNCTION__);
918 wake_up_interruptible(&ca->thread_queue);
922 * Used by the CA thread to determine if an early wakeup is necessary
924 * @param ca CA instance.
926 static int dvb_ca_en50221_thread_should_wakeup(struct dvb_ca_private *ca)
940 * Update the delay used by the thread.
942 * @param ca CA instance.
944 static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca)
947 int curdelay = 100000000;
950 for (slot = 0; slot < ca->slot_count; slot++) {
951 switch (ca->slot_info[slot].slot_state) {
953 case DVB_CA_SLOTSTATE_NONE:
954 case DVB_CA_SLOTSTATE_INVALID:
956 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) {
961 case DVB_CA_SLOTSTATE_UNINITIALISED:
962 case DVB_CA_SLOTSTATE_WAITREADY:
963 case DVB_CA_SLOTSTATE_VALIDATE:
964 case DVB_CA_SLOTSTATE_WAITFR:
965 case DVB_CA_SLOTSTATE_LINKINIT:
969 case DVB_CA_SLOTSTATE_RUNNING:
971 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) {
975 if ((!ca->slot_info[slot].da_irq_supported) ||
976 (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA))) {
983 if (delay < curdelay)
987 ca->delay = curdelay;
993 * Kernel thread which monitors CA slots for CAM changes, and performs data transfers.
995 static int dvb_ca_en50221_thread(void *data)
997 struct dvb_ca_private *ca = data;
1005 dprintk("%s\n", __FUNCTION__);
1007 /* setup kernel thread */
1008 snprintf(name, sizeof(name), "kdvb-ca-%i:%i", ca->dvbdev->adapter->num, ca->dvbdev->id);
1012 sigfillset(¤t->blocked);
1015 /* choose the correct initial delay */
1016 dvb_ca_en50221_thread_update_delay(ca);
1020 /* sleep for a bit */
1022 flags = wait_event_interruptible_timeout(ca->thread_queue,
1023 dvb_ca_en50221_thread_should_wakeup(ca),
1025 if ((flags == -ERESTARTSYS) || ca->exit) {
1026 /* got signal or quitting */
1032 /* go through all the slots processing them */
1033 for (slot = 0; slot < ca->slot_count; slot++) {
1035 // check the cam status + deal with CAMCHANGEs
1036 while (dvb_ca_en50221_check_camstatus(ca, slot)) {
1037 /* clear down an old CI slot if necessary */
1038 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE)
1039 dvb_ca_en50221_slot_shutdown(ca, slot);
1041 /* if a CAM is NOW present, initialise it */
1042 if (ca->slot_info[slot].camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) {
1043 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_UNINITIALISED;
1046 /* we've handled one CAMCHANGE */
1047 dvb_ca_en50221_thread_update_delay(ca);
1048 atomic_dec(&ca->slot_info[slot].camchange_count);
1051 // CAM state machine
1052 switch (ca->slot_info[slot].slot_state) {
1053 case DVB_CA_SLOTSTATE_NONE:
1054 case DVB_CA_SLOTSTATE_INVALID:
1058 case DVB_CA_SLOTSTATE_UNINITIALISED:
1059 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITREADY;
1060 ca->pub->slot_reset(ca->pub, slot);
1061 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1064 case DVB_CA_SLOTSTATE_WAITREADY:
1065 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1066 printk("dvb_ca adaptor %d: PC card did not respond :(\n",
1067 ca->dvbdev->adapter->num);
1068 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1069 dvb_ca_en50221_thread_update_delay(ca);
1072 // no other action needed; will automatically change state when ready
1075 case DVB_CA_SLOTSTATE_VALIDATE:
1076 if (dvb_ca_en50221_parse_attributes(ca, slot)
1078 printk("dvb_ca adapter %d: Invalid PC card inserted :(\n",
1079 ca->dvbdev->adapter->num);
1080 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1081 dvb_ca_en50221_thread_update_delay(ca);
1084 if (dvb_ca_en50221_set_configoption(ca, slot) != 0) {
1085 printk("dvb_ca adapter %d: Unable to initialise CAM :(\n",
1086 ca->dvbdev->adapter->num);
1087 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1088 dvb_ca_en50221_thread_update_delay(ca);
1091 if (ca->pub->write_cam_control(ca->pub, slot,
1092 CTRLIF_COMMAND, CMDREG_RS) != 0) {
1093 printk("dvb_ca adapter %d: Unable to reset CAM IF\n",
1094 ca->dvbdev->adapter->num);
1095 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1096 dvb_ca_en50221_thread_update_delay(ca);
1099 dprintk("DVB CAM validated successfully\n");
1101 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1102 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITFR;
1106 case DVB_CA_SLOTSTATE_WAITFR:
1107 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1108 printk("dvb_ca adapter %d: DVB CAM did not respond :(\n",
1109 ca->dvbdev->adapter->num);
1110 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1111 dvb_ca_en50221_thread_update_delay(ca);
1115 flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
1116 if (flags & STATUSREG_FR) {
1117 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
1122 case DVB_CA_SLOTSTATE_LINKINIT:
1123 if (dvb_ca_en50221_link_init(ca, slot) != 0) {
1124 printk("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n", ca->dvbdev->adapter->num);
1125 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1126 dvb_ca_en50221_thread_update_delay(ca);
1130 rxbuf = vmalloc(RX_BUFFER_SIZE);
1131 if (rxbuf == NULL) {
1132 printk("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n", ca->dvbdev->adapter->num);
1133 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1134 dvb_ca_en50221_thread_update_delay(ca);
1137 down_write(&ca->slot_info[slot].sem);
1138 dvb_ringbuffer_init(&ca->slot_info[slot].rx_buffer, rxbuf, RX_BUFFER_SIZE);
1139 up_write(&ca->slot_info[slot].sem);
1141 ca->pub->slot_ts_enable(ca->pub, slot);
1142 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_RUNNING;
1143 dvb_ca_en50221_thread_update_delay(ca);
1144 printk("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n", ca->dvbdev->adapter->num);
1147 case DVB_CA_SLOTSTATE_RUNNING:
1151 // no need to poll if the CAM supports IRQs
1152 if (ca->slot_info[slot].da_irq_supported)
1157 while ((status = dvb_ca_en50221_read_data(ca, slot, NULL, 0)) > 0) {
1161 /* if a CAMCHANGE occurred at some point, do not do any more processing of this slot */
1162 if (dvb_ca_en50221_check_camstatus(ca, slot)) {
1163 // we dont want to sleep on the next iteration so we can handle the cam change
1168 /* check if we've hit our limit this time */
1169 if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) {
1170 // dont sleep; there is likely to be more data to read
1183 wake_up_interruptible(&ca->thread_queue);
1189 /* ******************************************************************************** */
1190 /* EN50221 IO interface functions */
1193 * Real ioctl implementation.
1194 * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them.
1196 * @param inode Inode concerned.
1197 * @param file File concerned.
1198 * @param cmd IOCTL command.
1199 * @param arg Associated argument.
1201 * @return 0 on success, <0 on error.
1203 static int dvb_ca_en50221_io_do_ioctl(struct inode *inode, struct file *file,
1204 unsigned int cmd, void *parg)
1206 struct dvb_device *dvbdev = file->private_data;
1207 struct dvb_ca_private *ca = dvbdev->priv;
1211 dprintk("%s\n", __FUNCTION__);
1215 for (slot = 0; slot < ca->slot_count; slot++) {
1216 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) {
1217 dvb_ca_en50221_slot_shutdown(ca, slot);
1218 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)
1219 dvb_ca_en50221_camchange_irq(ca->pub,
1221 DVB_CA_EN50221_CAMCHANGE_INSERTED);
1224 ca->next_read_slot = 0;
1225 dvb_ca_en50221_thread_wakeup(ca);
1229 struct ca_caps *caps = parg;
1231 caps->slot_num = ca->slot_count;
1232 caps->slot_type = CA_CI_LINK;
1233 caps->descr_num = 0;
1234 caps->descr_type = 0;
1238 case CA_GET_SLOT_INFO: {
1239 struct ca_slot_info *info = parg;
1241 if ((info->num > ca->slot_count) || (info->num < 0))
1244 info->type = CA_CI_LINK;
1246 if ((ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_NONE)
1247 && (ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_INVALID)) {
1248 info->flags = CA_CI_MODULE_PRESENT;
1250 if (ca->slot_info[info->num].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1251 info->flags |= CA_CI_MODULE_READY;
1266 * Wrapper for ioctl implementation.
1268 * @param inode Inode concerned.
1269 * @param file File concerned.
1270 * @param cmd IOCTL command.
1271 * @param arg Associated argument.
1273 * @return 0 on success, <0 on error.
1275 static int dvb_ca_en50221_io_ioctl(struct inode *inode, struct file *file,
1276 unsigned int cmd, unsigned long arg)
1278 return dvb_usercopy(inode, file, cmd, arg, dvb_ca_en50221_io_do_ioctl);
1283 * Implementation of write() syscall.
1285 * @param file File structure.
1286 * @param buf Source buffer.
1287 * @param count Size of source buffer.
1288 * @param ppos Position in file (ignored).
1290 * @return Number of bytes read, or <0 on error.
1292 static ssize_t dvb_ca_en50221_io_write(struct file *file,
1293 const char __user * buf, size_t count, loff_t * ppos)
1295 struct dvb_device *dvbdev = file->private_data;
1296 struct dvb_ca_private *ca = dvbdev->priv;
1297 u8 slot, connection_id;
1299 char fragbuf[HOST_LINK_BUF_SIZE];
1302 unsigned long timeout;
1305 dprintk("%s\n", __FUNCTION__);
1307 /* Incoming packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1311 /* extract slot & connection id */
1312 if (copy_from_user(&slot, buf, 1))
1314 if (copy_from_user(&connection_id, buf + 1, 1))
1319 /* check if the slot is actually running */
1320 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1323 /* fragment the packets & store in the buffer */
1324 while (fragpos < count) {
1325 fraglen = ca->slot_info[slot].link_buf_size - 2;
1326 if ((count - fragpos) < fraglen)
1327 fraglen = count - fragpos;
1329 fragbuf[0] = connection_id;
1330 fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00;
1331 if ((status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen)) != 0)
1334 timeout = jiffies + HZ / 2;
1336 while (!time_after(jiffies, timeout)) {
1337 /* check the CAM hasn't been removed/reset in the meantime */
1338 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) {
1343 status = dvb_ca_en50221_write_data(ca, slot, fragbuf, fraglen + 2);
1344 if (status == (fraglen + 2)) {
1348 if (status != -EAGAIN)
1368 * Condition for waking up in dvb_ca_en50221_io_read_condition
1370 static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca, int *result, int *_slot)
1376 int connection_id = -1;
1380 slot = ca->next_read_slot;
1381 while ((slot_count < ca->slot_count) && (!found)) {
1382 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1385 down_read(&ca->slot_info[slot].sem);
1387 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1388 up_read(&ca->slot_info[slot].sem);
1392 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1394 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2, 0);
1395 if (connection_id == -1)
1396 connection_id = hdr[0];
1397 if ((hdr[0] == connection_id) && ((hdr[1] & 0x80) == 0)) {
1403 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1407 up_read(&ca->slot_info[slot].sem);
1410 slot = (slot + 1) % ca->slot_count;
1414 ca->next_read_slot = slot;
1420 * Implementation of read() syscall.
1422 * @param file File structure.
1423 * @param buf Destination buffer.
1424 * @param count Size of destination buffer.
1425 * @param ppos Position in file (ignored).
1427 * @return Number of bytes read, or <0 on error.
1429 static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user * buf,
1430 size_t count, loff_t * ppos)
1432 struct dvb_device *dvbdev = file->private_data;
1433 struct dvb_ca_private *ca = dvbdev->priv;
1438 int connection_id = -1;
1440 int last_fragment = 0;
1445 dprintk("%s\n", __FUNCTION__);
1447 /* Outgoing packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1451 /* wait for some data */
1452 if ((status = dvb_ca_en50221_io_read_condition(ca, &result, &slot)) == 0) {
1454 /* if we're in nonblocking mode, exit immediately */
1455 if (file->f_flags & O_NONBLOCK)
1456 return -EWOULDBLOCK;
1458 /* wait for some data */
1459 status = wait_event_interruptible(ca->wait_queue,
1460 dvb_ca_en50221_io_read_condition
1461 (ca, &result, &slot));
1463 if ((status < 0) || (result < 0)) {
1469 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1473 printk("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n", ca->dvbdev->adapter->num);
1478 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2, 0);
1479 if (connection_id == -1)
1480 connection_id = hdr[0];
1481 if (hdr[0] == connection_id) {
1482 if (pktlen < count) {
1483 if ((pktlen + fraglen - 2) > count) {
1484 fraglen = count - pktlen;
1489 if ((status = dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 2,
1490 buf + pktlen, fraglen, 1)) < 0) {
1496 if ((hdr[1] & 0x80) == 0)
1501 idx2 = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1503 dvb_ringbuffer_pkt_dispose(&ca->slot_info[slot].rx_buffer, idx);
1506 } while (!last_fragment);
1509 hdr[1] = connection_id;
1510 if ((status = copy_to_user(buf, hdr, 2)) != 0)
1515 up_read(&ca->slot_info[slot].sem);
1521 * Implementation of file open syscall.
1523 * @param inode Inode concerned.
1524 * @param file File concerned.
1526 * @return 0 on success, <0 on failure.
1528 static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file)
1530 struct dvb_device *dvbdev = file->private_data;
1531 struct dvb_ca_private *ca = dvbdev->priv;
1535 dprintk("%s\n", __FUNCTION__);
1537 if (!try_module_get(ca->pub->owner))
1540 err = dvb_generic_open(inode, file);
1544 for (i = 0; i < ca->slot_count; i++) {
1546 if (ca->slot_info[i].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1547 down_write(&ca->slot_info[i].sem);
1548 if (ca->slot_info[i].rx_buffer.data != NULL) {
1549 dvb_ringbuffer_flush(&ca->slot_info[i].rx_buffer);
1551 up_write(&ca->slot_info[i].sem);
1556 dvb_ca_en50221_thread_update_delay(ca);
1557 dvb_ca_en50221_thread_wakeup(ca);
1564 * Implementation of file close syscall.
1566 * @param inode Inode concerned.
1567 * @param file File concerned.
1569 * @return 0 on success, <0 on failure.
1571 static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file)
1573 struct dvb_device *dvbdev = file->private_data;
1574 struct dvb_ca_private *ca = dvbdev->priv;
1577 dprintk("%s\n", __FUNCTION__);
1579 /* mark the CA device as closed */
1581 dvb_ca_en50221_thread_update_delay(ca);
1583 err = dvb_generic_release(inode, file);
1585 module_put(ca->pub->owner);
1592 * Implementation of poll() syscall.
1594 * @param file File concerned.
1595 * @param wait poll wait table.
1597 * @return Standard poll mask.
1599 static unsigned int dvb_ca_en50221_io_poll(struct file *file, poll_table * wait)
1601 struct dvb_device *dvbdev = file->private_data;
1602 struct dvb_ca_private *ca = dvbdev->priv;
1603 unsigned int mask = 0;
1607 dprintk("%s\n", __FUNCTION__);
1609 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1610 up_read(&ca->slot_info[slot].sem);
1614 /* if there is something, return now */
1618 /* wait for something to happen */
1619 poll_wait(file, &ca->wait_queue, wait);
1621 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1622 up_read(&ca->slot_info[slot].sem);
1628 EXPORT_SYMBOL(dvb_ca_en50221_init);
1631 static struct file_operations dvb_ca_fops = {
1632 .owner = THIS_MODULE,
1633 .read = dvb_ca_en50221_io_read,
1634 .write = dvb_ca_en50221_io_write,
1635 .ioctl = dvb_ca_en50221_io_ioctl,
1636 .open = dvb_ca_en50221_io_open,
1637 .release = dvb_ca_en50221_io_release,
1638 .poll = dvb_ca_en50221_io_poll,
1641 static struct dvb_device dvbdev_ca = {
1646 .fops = &dvb_ca_fops,
1650 /* ******************************************************************************** */
1651 /* Initialisation/shutdown functions */
1655 * Initialise a new DVB CA EN50221 interface device.
1657 * @param dvb_adapter DVB adapter to attach the new CA device to.
1658 * @param ca The dvb_ca instance.
1659 * @param flags Flags describing the CA device (DVB_CA_FLAG_*).
1660 * @param slot_count Number of slots supported.
1662 * @return 0 on success, nonzero on failure
1664 int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter,
1665 struct dvb_ca_en50221 *pubca, int flags, int slot_count)
1668 struct dvb_ca_private *ca = NULL;
1671 dprintk("%s\n", __FUNCTION__);
1676 /* initialise the system data */
1678 (struct dvb_ca_private *) kmalloc(sizeof(struct dvb_ca_private),
1679 GFP_KERNEL)) == NULL) {
1683 memset(ca, 0, sizeof(struct dvb_ca_private));
1686 ca->slot_count = slot_count;
1687 if ((ca->slot_info = kmalloc(sizeof(struct dvb_ca_slot) * slot_count, GFP_KERNEL)) == NULL) {
1691 memset(ca->slot_info, 0, sizeof(struct dvb_ca_slot) * slot_count);
1692 init_waitqueue_head(&ca->wait_queue);
1694 init_waitqueue_head(&ca->thread_queue);
1698 ca->next_read_slot = 0;
1699 pubca->private = ca;
1701 /* register the DVB device */
1702 ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, DVB_DEVICE_CA);
1706 /* now initialise each slot */
1707 for (i = 0; i < slot_count; i++) {
1708 memset(&ca->slot_info[i], 0, sizeof(struct dvb_ca_slot));
1709 ca->slot_info[i].slot_state = DVB_CA_SLOTSTATE_NONE;
1710 atomic_set(&ca->slot_info[i].camchange_count, 0);
1711 ca->slot_info[i].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
1712 init_rwsem(&ca->slot_info[i].sem);
1715 if (signal_pending(current)) {
1721 /* create a kthread for monitoring this CA device */
1723 ret = kernel_thread(dvb_ca_en50221_thread, ca, 0);
1726 printk("dvb_ca_init: failed to start kernel_thread (%d)\n", ret);
1729 ca->thread_pid = ret;
1734 if (ca->dvbdev != NULL)
1735 dvb_unregister_device(ca->dvbdev);
1736 kfree(ca->slot_info);
1739 pubca->private = NULL;
1742 EXPORT_SYMBOL(dvb_ca_en50221_release);
1747 * Release a DVB CA EN50221 interface device.
1749 * @param ca_dev The dvb_device_t instance for the CA device.
1750 * @param ca The associated dvb_ca instance.
1752 void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca)
1754 struct dvb_ca_private *ca = pubca->private;
1757 dprintk("%s\n", __FUNCTION__);
1759 /* shutdown the thread if there was one */
1760 if (ca->thread_pid) {
1761 if (kill_proc(ca->thread_pid, 0, 1) == -ESRCH) {
1762 printk("dvb_ca_release adapter %d: thread PID %d already died\n",
1763 ca->dvbdev->adapter->num, ca->thread_pid);
1767 dvb_ca_en50221_thread_wakeup(ca);
1768 wait_event_interruptible(ca->thread_queue, ca->thread_pid == 0);
1772 for (i = 0; i < ca->slot_count; i++) {
1773 dvb_ca_en50221_slot_shutdown(ca, i);
1775 kfree(ca->slot_info);
1776 dvb_unregister_device(ca->dvbdev);
1778 pubca->private = NULL;