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/vmalloc.h>
36 #include <linux/delay.h>
37 #include <linux/spinlock.h>
38 #include <linux/sched.h>
39 #include <linux/kthread.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 /* mutex used for serializing access to one CI slot */
97 struct mutex slot_lock;
99 /* Number of CAMCHANGES that have occurred since last processing */
100 atomic_t camchange_count;
102 /* Type of last CAMCHANGE */
105 /* base address of CAM config */
108 /* value to write into Config Control register */
111 /* if 1, the CAM supports DA IRQs */
112 u8 da_irq_supported:1;
114 /* size of the buffer to use when talking to the CAM */
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 */
146 struct task_struct *thread;
148 /* Flag indicating if the CA device is open */
151 /* Flag indicating the thread should wake up now */
152 unsigned int wakeup:1;
154 /* Delay the main thread should use */
157 /* Slot to start looking for data to read from in the next user-space read operation */
161 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca);
162 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount);
163 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount);
167 * Safely find needle in haystack.
169 * @param haystack Buffer to look in.
170 * @param hlen Number of bytes in haystack.
171 * @param needle Buffer to find.
172 * @param nlen Number of bytes in needle.
173 * @return Pointer into haystack needle was found at, or NULL if not found.
175 static char *findstr(char * haystack, int hlen, char * needle, int nlen)
182 for (i = 0; i <= hlen - nlen; i++) {
183 if (!strncmp(haystack + i, needle, nlen))
192 /* ******************************************************************************** */
193 /* EN50221 physical interface functions */
199 static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot)
206 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) {
207 return (atomic_read(&ca->slot_info[slot].camchange_count) != 0);
211 slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open);
213 cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0;
214 cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0;
216 int cam_present_old = (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE);
217 cam_changed = (cam_present_now != cam_present_old);
221 if (!cam_present_now) {
222 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
224 ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED;
226 atomic_set(&ca->slot_info[slot].camchange_count, 1);
228 if ((ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) &&
229 (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) {
230 // move to validate state if reset is completed
231 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
240 * Wait for flags to become set on the STATUS register on a CAM interface,
241 * checking for errors and timeout.
243 * @param ca CA instance.
244 * @param slot Slot on interface.
245 * @param waitfor Flags to wait for.
246 * @param timeout_ms Timeout in milliseconds.
248 * @return 0 on success, nonzero on error.
250 static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot,
251 u8 waitfor, int timeout_hz)
253 unsigned long timeout;
256 dprintk("%s\n", __func__);
258 /* loop until timeout elapsed */
260 timeout = jiffies + timeout_hz;
262 /* read the status and check for error */
263 int res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
267 /* if we got the flags, it was successful! */
269 dprintk("%s succeeded timeout:%lu\n", __func__, jiffies - start);
273 /* check for timeout */
274 if (time_after(jiffies, timeout)) {
282 dprintk("%s failed timeout:%lu\n", __func__, jiffies - start);
284 /* if we get here, we've timed out */
290 * Initialise the link layer connection to a CAM.
292 * @param ca CA instance.
293 * @param slot Slot id.
295 * @return 0 on success, nonzero on failure.
297 static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot)
303 dprintk("%s\n", __func__);
305 /* we'll be determining these during this function */
306 ca->slot_info[slot].da_irq_supported = 0;
308 /* set the host link buffer size temporarily. it will be overwritten with the
309 * real negotiated size later. */
310 ca->slot_info[slot].link_buf_size = 2;
312 /* read the buffer size from the CAM */
313 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SR)) != 0)
315 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ / 10)) != 0)
317 if ((ret = dvb_ca_en50221_read_data(ca, slot, buf, 2)) != 2)
319 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
322 /* store it, and choose the minimum of our buffer and the CAM's buffer size */
323 buf_size = (buf[0] << 8) | buf[1];
324 if (buf_size > HOST_LINK_BUF_SIZE)
325 buf_size = HOST_LINK_BUF_SIZE;
326 ca->slot_info[slot].link_buf_size = buf_size;
327 buf[0] = buf_size >> 8;
328 buf[1] = buf_size & 0xff;
329 dprintk("Chosen link buffer size of %i\n", buf_size);
331 /* write the buffer size to the CAM */
332 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SW)) != 0)
334 if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10)) != 0)
336 if ((ret = dvb_ca_en50221_write_data(ca, slot, buf, 2)) != 2)
338 if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0)
346 * Read a tuple from attribute memory.
348 * @param ca CA instance.
349 * @param slot Slot id.
350 * @param address Address to read from. Updated.
351 * @param tupleType Tuple id byte. Updated.
352 * @param tupleLength Tuple length. Updated.
353 * @param tuple Dest buffer for tuple (must be 256 bytes). Updated.
355 * @return 0 on success, nonzero on error.
357 static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot,
358 int *address, int *tupleType, int *tupleLength, u8 * tuple)
363 int _address = *address;
365 /* grab the next tuple length and type */
366 if ((_tupleType = ca->pub->read_attribute_mem(ca->pub, slot, _address)) < 0)
368 if (_tupleType == 0xff) {
369 dprintk("END OF CHAIN TUPLE type:0x%x\n", _tupleType);
371 *tupleType = _tupleType;
375 if ((_tupleLength = ca->pub->read_attribute_mem(ca->pub, slot, _address + 2)) < 0)
379 dprintk("TUPLE type:0x%x length:%i\n", _tupleType, _tupleLength);
381 /* read in the whole tuple */
382 for (i = 0; i < _tupleLength; i++) {
383 tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, _address + (i * 2));
384 dprintk(" 0x%02x: 0x%02x %c\n",
386 ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.');
388 _address += (_tupleLength * 2);
391 *tupleType = _tupleType;
392 *tupleLength = _tupleLength;
399 * Parse attribute memory of a CAM module, extracting Config register, and checking
400 * it is a DVB CAM module.
402 * @param ca CA instance.
403 * @param slot Slot id.
405 * @return 0 on success, <0 on failure.
407 static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot)
416 int got_cftableentry = 0;
425 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
427 if (tupleType != 0x1D)
434 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
436 if (tupleType != 0x1C)
443 dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0)
445 if (tupleType != 0x15)
451 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
452 &tupleLength, tuple)) < 0)
454 if (tupleType != 0x20)
456 if (tupleLength != 4)
458 manfid = (tuple[1] << 8) | tuple[0];
459 devid = (tuple[3] << 8) | tuple[2];
464 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
465 &tupleLength, tuple)) < 0)
467 if (tupleType != 0x1A)
472 /* extract the configbase */
474 if (tupleLength < (3 + rasz + 14))
476 ca->slot_info[slot].config_base = 0;
477 for (i = 0; i < rasz + 1; i++) {
478 ca->slot_info[slot].config_base |= (tuple[2 + i] << (8 * i));
481 /* check it contains the correct DVB string */
482 dvb_str = findstr((char *)tuple, tupleLength, "DVB_CI_V", 8);
485 if (tupleLength < ((dvb_str - (char *) tuple) + 12))
488 /* is it a version we support? */
489 if (strncmp(dvb_str + 8, "1.00", 4)) {
490 printk("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n",
491 ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9], dvb_str[10], dvb_str[11]);
495 /* process the CFTABLE_ENTRY tuples, and any after those */
496 while ((!end_chain) && (address < 0x1000)) {
497 if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType,
498 &tupleLength, tuple)) < 0)
501 case 0x1B: // CISTPL_CFTABLE_ENTRY
502 if (tupleLength < (2 + 11 + 17))
505 /* if we've already parsed one, just use it */
506 if (got_cftableentry)
509 /* get the config option */
510 ca->slot_info[slot].config_option = tuple[0] & 0x3f;
512 /* OK, check it contains the correct strings */
513 if ((findstr((char *)tuple, tupleLength, "DVB_HOST", 8) == NULL) ||
514 (findstr((char *)tuple, tupleLength, "DVB_CI_MODULE", 13) == NULL))
517 got_cftableentry = 1;
520 case 0x14: // CISTPL_NO_LINK
523 case 0xFF: // CISTPL_END
527 default: /* Unknown tuple type - just skip this tuple and move to the next one */
528 dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n", tupleType,
534 if ((address > 0x1000) || (!got_cftableentry))
537 dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n",
538 manfid, devid, ca->slot_info[slot].config_base, ca->slot_info[slot].config_option);
546 * Set CAM's configoption correctly.
548 * @param ca CA instance.
549 * @param slot Slot containing the CAM.
551 static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot)
555 dprintk("%s\n", __func__);
557 /* set the config option */
558 ca->pub->write_attribute_mem(ca->pub, slot,
559 ca->slot_info[slot].config_base,
560 ca->slot_info[slot].config_option);
563 configoption = ca->pub->read_attribute_mem(ca->pub, slot, ca->slot_info[slot].config_base);
564 dprintk("Set configoption 0x%x, read configoption 0x%x\n",
565 ca->slot_info[slot].config_option, configoption & 0x3f);
574 * This function talks to an EN50221 CAM control interface. It reads a buffer of
575 * data from the CAM. The data can either be stored in a supplied buffer, or
576 * automatically be added to the slot's rx_buffer.
578 * @param ca CA instance.
579 * @param slot Slot to read from.
580 * @param ebuf If non-NULL, the data will be written to this buffer. If NULL,
581 * the data will be added into the buffering system as a normal fragment.
582 * @param ecount Size of ebuf. Ignored if ebuf is NULL.
584 * @return Number of bytes read, or < 0 on error
586 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount)
590 u8 buf[HOST_LINK_BUF_SIZE];
593 dprintk("%s\n", __func__);
595 /* check if we have space for a link buf in the rx_buffer */
599 if (ca->slot_info[slot].rx_buffer.data == NULL) {
603 buf_free = dvb_ringbuffer_free(&ca->slot_info[slot].rx_buffer);
605 if (buf_free < (ca->slot_info[slot].link_buf_size + DVB_RINGBUFFER_PKTHDRSIZE)) {
611 /* check if there is data available */
612 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
614 if (!(status & STATUSREG_DA)) {
620 /* read the amount of data */
621 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH)) < 0)
623 bytes_read = status << 8;
624 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW)) < 0)
626 bytes_read |= status;
628 /* check it will fit */
630 if (bytes_read > ca->slot_info[slot].link_buf_size) {
631 printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n",
632 ca->dvbdev->adapter->num, bytes_read, ca->slot_info[slot].link_buf_size);
633 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
637 if (bytes_read < 2) {
638 printk("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n",
639 ca->dvbdev->adapter->num);
640 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
645 if (bytes_read > ecount) {
646 printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n",
647 ca->dvbdev->adapter->num);
653 /* fill the buffer */
654 for (i = 0; i < bytes_read; i++) {
655 /* read byte and check */
656 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_DATA)) < 0)
659 /* OK, store it in the buffer */
663 /* check for read error (RE should now be 0) */
664 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
666 if (status & STATUSREG_RE) {
667 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
672 /* OK, add it to the receive buffer, or copy into external buffer if supplied */
674 if (ca->slot_info[slot].rx_buffer.data == NULL) {
678 dvb_ringbuffer_pkt_write(&ca->slot_info[slot].rx_buffer, buf, bytes_read);
680 memcpy(ebuf, buf, bytes_read);
683 dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot,
684 buf[0], (buf[1] & 0x80) == 0, bytes_read);
686 /* wake up readers when a last_fragment is received */
687 if ((buf[1] & 0x80) == 0x00) {
688 wake_up_interruptible(&ca->wait_queue);
698 * This function talks to an EN50221 CAM control interface. It writes a buffer of data
701 * @param ca CA instance.
702 * @param slot Slot to write to.
703 * @param ebuf The data in this buffer is treated as a complete link-level packet to
705 * @param count Size of ebuf.
707 * @return Number of bytes written, or < 0 on error.
709 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * buf, int bytes_write)
714 dprintk("%s\n", __func__);
718 if (bytes_write > ca->slot_info[slot].link_buf_size)
721 /* it is possible we are dealing with a single buffer implementation,
722 thus if there is data available for read or if there is even a read
723 already in progress, we do nothing but awake the kernel thread to
724 process the data if necessary. */
725 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
727 if (status & (STATUSREG_DA | STATUSREG_RE)) {
728 if (status & STATUSREG_DA)
729 dvb_ca_en50221_thread_wakeup(ca);
736 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
737 IRQEN | CMDREG_HC)) != 0)
740 /* check if interface is still free */
741 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
743 if (!(status & STATUSREG_FR)) {
744 /* it wasn't free => try again later */
749 /* send the amount of data */
750 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, bytes_write >> 8)) != 0)
752 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW,
753 bytes_write & 0xff)) != 0)
756 /* send the buffer */
757 for (i = 0; i < bytes_write; i++) {
758 if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, buf[i])) != 0)
762 /* check for write error (WE should now be 0) */
763 if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0)
765 if (status & STATUSREG_WE) {
766 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
770 status = bytes_write;
772 dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot,
773 buf[0], (buf[1] & 0x80) == 0, bytes_write);
776 ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
781 EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq);
785 /* ******************************************************************************** */
786 /* EN50221 higher level functions */
790 * A CAM has been removed => shut it down.
792 * @param ca CA instance.
793 * @param slot Slot to shut down.
795 static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot)
797 dprintk("%s\n", __func__);
799 ca->pub->slot_shutdown(ca->pub, slot);
800 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
802 /* need to wake up all processes to check if they're now
803 trying to write to a defunct CAM */
804 wake_up_interruptible(&ca->wait_queue);
806 dprintk("Slot %i shutdown\n", slot);
811 EXPORT_SYMBOL(dvb_ca_en50221_camready_irq);
815 * A CAMCHANGE IRQ has occurred.
817 * @param ca CA instance.
818 * @param slot Slot concerned.
819 * @param change_type One of the DVB_CA_CAMCHANGE_* values.
821 void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot, int change_type)
823 struct dvb_ca_private *ca = pubca->private;
825 dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type);
827 switch (change_type) {
828 case DVB_CA_EN50221_CAMCHANGE_REMOVED:
829 case DVB_CA_EN50221_CAMCHANGE_INSERTED:
836 ca->slot_info[slot].camchange_type = change_type;
837 atomic_inc(&ca->slot_info[slot].camchange_count);
838 dvb_ca_en50221_thread_wakeup(ca);
840 EXPORT_SYMBOL(dvb_ca_en50221_frda_irq);
844 * A CAMREADY IRQ has occurred.
846 * @param ca CA instance.
847 * @param slot Slot concerned.
849 void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot)
851 struct dvb_ca_private *ca = pubca->private;
853 dprintk("CAMREADY IRQ slot:%i\n", slot);
855 if (ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) {
856 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE;
857 dvb_ca_en50221_thread_wakeup(ca);
863 * An FR or DA IRQ has occurred.
865 * @param ca CA instance.
866 * @param slot Slot concerned.
868 void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot)
870 struct dvb_ca_private *ca = pubca->private;
873 dprintk("FR/DA IRQ slot:%i\n", slot);
875 switch (ca->slot_info[slot].slot_state) {
876 case DVB_CA_SLOTSTATE_LINKINIT:
877 flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS);
878 if (flags & STATUSREG_DA) {
879 dprintk("CAM supports DA IRQ\n");
880 ca->slot_info[slot].da_irq_supported = 1;
884 case DVB_CA_SLOTSTATE_RUNNING:
886 dvb_ca_en50221_thread_wakeup(ca);
893 /* ******************************************************************************** */
894 /* EN50221 thread functions */
897 * Wake up the DVB CA thread
899 * @param ca CA instance.
901 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca)
904 dprintk("%s\n", __func__);
908 wake_up_process(ca->thread);
912 * Update the delay used by the thread.
914 * @param ca CA instance.
916 static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca)
919 int curdelay = 100000000;
922 /* Beware of too high polling frequency, because one polling
923 * call might take several hundred milliseconds until timeout!
925 for (slot = 0; slot < ca->slot_count; slot++) {
926 switch (ca->slot_info[slot].slot_state) {
928 case DVB_CA_SLOTSTATE_NONE:
929 delay = HZ * 60; /* 60s */
930 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
931 delay = HZ * 5; /* 5s */
933 case DVB_CA_SLOTSTATE_INVALID:
934 delay = HZ * 60; /* 60s */
935 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
936 delay = HZ / 10; /* 100ms */
939 case DVB_CA_SLOTSTATE_UNINITIALISED:
940 case DVB_CA_SLOTSTATE_WAITREADY:
941 case DVB_CA_SLOTSTATE_VALIDATE:
942 case DVB_CA_SLOTSTATE_WAITFR:
943 case DVB_CA_SLOTSTATE_LINKINIT:
944 delay = HZ / 10; /* 100ms */
947 case DVB_CA_SLOTSTATE_RUNNING:
948 delay = HZ * 60; /* 60s */
949 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
950 delay = HZ / 10; /* 100ms */
952 if ((!ca->slot_info[slot].da_irq_supported) ||
953 (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA)))
954 delay = HZ / 10; /* 100ms */
959 if (delay < curdelay)
963 ca->delay = curdelay;
969 * Kernel thread which monitors CA slots for CAM changes, and performs data transfers.
971 static int dvb_ca_en50221_thread(void *data)
973 struct dvb_ca_private *ca = data;
980 dprintk("%s\n", __func__);
982 /* choose the correct initial delay */
983 dvb_ca_en50221_thread_update_delay(ca);
986 while (!kthread_should_stop()) {
987 /* sleep for a bit */
989 set_current_state(TASK_INTERRUPTIBLE);
990 schedule_timeout(ca->delay);
991 if (kthread_should_stop())
996 /* go through all the slots processing them */
997 for (slot = 0; slot < ca->slot_count; slot++) {
999 mutex_lock(&ca->slot_info[slot].slot_lock);
1001 // check the cam status + deal with CAMCHANGEs
1002 while (dvb_ca_en50221_check_camstatus(ca, slot)) {
1003 /* clear down an old CI slot if necessary */
1004 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE)
1005 dvb_ca_en50221_slot_shutdown(ca, slot);
1007 /* if a CAM is NOW present, initialise it */
1008 if (ca->slot_info[slot].camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) {
1009 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_UNINITIALISED;
1012 /* we've handled one CAMCHANGE */
1013 dvb_ca_en50221_thread_update_delay(ca);
1014 atomic_dec(&ca->slot_info[slot].camchange_count);
1017 // CAM state machine
1018 switch (ca->slot_info[slot].slot_state) {
1019 case DVB_CA_SLOTSTATE_NONE:
1020 case DVB_CA_SLOTSTATE_INVALID:
1024 case DVB_CA_SLOTSTATE_UNINITIALISED:
1025 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITREADY;
1026 ca->pub->slot_reset(ca->pub, slot);
1027 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1030 case DVB_CA_SLOTSTATE_WAITREADY:
1031 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1032 printk("dvb_ca adaptor %d: PC card did not respond :(\n",
1033 ca->dvbdev->adapter->num);
1034 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1035 dvb_ca_en50221_thread_update_delay(ca);
1038 // no other action needed; will automatically change state when ready
1041 case DVB_CA_SLOTSTATE_VALIDATE:
1042 if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) {
1043 /* we need this extra check for annoying interfaces like the budget-av */
1044 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1045 (ca->pub->poll_slot_status)) {
1046 status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1047 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1048 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1049 dvb_ca_en50221_thread_update_delay(ca);
1054 printk("dvb_ca adapter %d: Invalid PC card inserted :(\n",
1055 ca->dvbdev->adapter->num);
1056 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1057 dvb_ca_en50221_thread_update_delay(ca);
1060 if (dvb_ca_en50221_set_configoption(ca, slot) != 0) {
1061 printk("dvb_ca adapter %d: Unable to initialise CAM :(\n",
1062 ca->dvbdev->adapter->num);
1063 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1064 dvb_ca_en50221_thread_update_delay(ca);
1067 if (ca->pub->write_cam_control(ca->pub, slot,
1068 CTRLIF_COMMAND, CMDREG_RS) != 0) {
1069 printk("dvb_ca adapter %d: Unable to reset CAM IF\n",
1070 ca->dvbdev->adapter->num);
1071 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1072 dvb_ca_en50221_thread_update_delay(ca);
1075 dprintk("DVB CAM validated successfully\n");
1077 ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1078 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITFR;
1082 case DVB_CA_SLOTSTATE_WAITFR:
1083 if (time_after(jiffies, ca->slot_info[slot].timeout)) {
1084 printk("dvb_ca adapter %d: DVB CAM did not respond :(\n",
1085 ca->dvbdev->adapter->num);
1086 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1087 dvb_ca_en50221_thread_update_delay(ca);
1091 flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
1092 if (flags & STATUSREG_FR) {
1093 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
1098 case DVB_CA_SLOTSTATE_LINKINIT:
1099 if (dvb_ca_en50221_link_init(ca, slot) != 0) {
1100 /* we need this extra check for annoying interfaces like the budget-av */
1101 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1102 (ca->pub->poll_slot_status)) {
1103 status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1104 if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1105 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1106 dvb_ca_en50221_thread_update_delay(ca);
1111 printk("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n", ca->dvbdev->adapter->num);
1112 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1113 dvb_ca_en50221_thread_update_delay(ca);
1117 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1118 rxbuf = vmalloc(RX_BUFFER_SIZE);
1119 if (rxbuf == NULL) {
1120 printk("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n", ca->dvbdev->adapter->num);
1121 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
1122 dvb_ca_en50221_thread_update_delay(ca);
1125 dvb_ringbuffer_init(&ca->slot_info[slot].rx_buffer, rxbuf, RX_BUFFER_SIZE);
1128 ca->pub->slot_ts_enable(ca->pub, slot);
1129 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_RUNNING;
1130 dvb_ca_en50221_thread_update_delay(ca);
1131 printk("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n", ca->dvbdev->adapter->num);
1134 case DVB_CA_SLOTSTATE_RUNNING:
1138 // poll slots for data
1140 while ((status = dvb_ca_en50221_read_data(ca, slot, NULL, 0)) > 0) {
1144 /* if a CAMCHANGE occurred at some point, do not do any more processing of this slot */
1145 if (dvb_ca_en50221_check_camstatus(ca, slot)) {
1146 // we dont want to sleep on the next iteration so we can handle the cam change
1151 /* check if we've hit our limit this time */
1152 if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) {
1153 // dont sleep; there is likely to be more data to read
1161 mutex_unlock(&ca->slot_info[slot].slot_lock);
1170 /* ******************************************************************************** */
1171 /* EN50221 IO interface functions */
1174 * Real ioctl implementation.
1175 * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them.
1177 * @param inode Inode concerned.
1178 * @param file File concerned.
1179 * @param cmd IOCTL command.
1180 * @param arg Associated argument.
1182 * @return 0 on success, <0 on error.
1184 static int dvb_ca_en50221_io_do_ioctl(struct inode *inode, struct file *file,
1185 unsigned int cmd, void *parg)
1187 struct dvb_device *dvbdev = file->private_data;
1188 struct dvb_ca_private *ca = dvbdev->priv;
1192 dprintk("%s\n", __func__);
1196 for (slot = 0; slot < ca->slot_count; slot++) {
1197 mutex_lock(&ca->slot_info[slot].slot_lock);
1198 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) {
1199 dvb_ca_en50221_slot_shutdown(ca, slot);
1200 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)
1201 dvb_ca_en50221_camchange_irq(ca->pub,
1203 DVB_CA_EN50221_CAMCHANGE_INSERTED);
1205 mutex_unlock(&ca->slot_info[slot].slot_lock);
1207 ca->next_read_slot = 0;
1208 dvb_ca_en50221_thread_wakeup(ca);
1212 struct ca_caps *caps = parg;
1214 caps->slot_num = ca->slot_count;
1215 caps->slot_type = CA_CI_LINK;
1216 caps->descr_num = 0;
1217 caps->descr_type = 0;
1221 case CA_GET_SLOT_INFO: {
1222 struct ca_slot_info *info = parg;
1224 if ((info->num > ca->slot_count) || (info->num < 0))
1227 info->type = CA_CI_LINK;
1229 if ((ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_NONE)
1230 && (ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_INVALID)) {
1231 info->flags = CA_CI_MODULE_PRESENT;
1233 if (ca->slot_info[info->num].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1234 info->flags |= CA_CI_MODULE_READY;
1249 * Wrapper for ioctl implementation.
1251 * @param inode Inode concerned.
1252 * @param file File concerned.
1253 * @param cmd IOCTL command.
1254 * @param arg Associated argument.
1256 * @return 0 on success, <0 on error.
1258 static int dvb_ca_en50221_io_ioctl(struct inode *inode, struct file *file,
1259 unsigned int cmd, unsigned long arg)
1261 return dvb_usercopy(inode, file, cmd, arg, dvb_ca_en50221_io_do_ioctl);
1266 * Implementation of write() syscall.
1268 * @param file File structure.
1269 * @param buf Source buffer.
1270 * @param count Size of source buffer.
1271 * @param ppos Position in file (ignored).
1273 * @return Number of bytes read, or <0 on error.
1275 static ssize_t dvb_ca_en50221_io_write(struct file *file,
1276 const char __user * buf, size_t count, loff_t * ppos)
1278 struct dvb_device *dvbdev = file->private_data;
1279 struct dvb_ca_private *ca = dvbdev->priv;
1280 u8 slot, connection_id;
1282 u8 fragbuf[HOST_LINK_BUF_SIZE];
1285 unsigned long timeout;
1288 dprintk("%s\n", __func__);
1290 /* Incoming packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1294 /* extract slot & connection id */
1295 if (copy_from_user(&slot, buf, 1))
1297 if (copy_from_user(&connection_id, buf + 1, 1))
1302 /* check if the slot is actually running */
1303 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1306 /* fragment the packets & store in the buffer */
1307 while (fragpos < count) {
1308 fraglen = ca->slot_info[slot].link_buf_size - 2;
1309 if ((count - fragpos) < fraglen)
1310 fraglen = count - fragpos;
1312 fragbuf[0] = connection_id;
1313 fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00;
1314 if ((status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen)) != 0)
1317 timeout = jiffies + HZ / 2;
1319 while (!time_after(jiffies, timeout)) {
1320 /* check the CAM hasn't been removed/reset in the meantime */
1321 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) {
1326 mutex_lock(&ca->slot_info[slot].slot_lock);
1327 status = dvb_ca_en50221_write_data(ca, slot, fragbuf, fraglen + 2);
1328 mutex_unlock(&ca->slot_info[slot].slot_lock);
1329 if (status == (fraglen + 2)) {
1333 if (status != -EAGAIN)
1353 * Condition for waking up in dvb_ca_en50221_io_read_condition
1355 static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca,
1356 int *result, int *_slot)
1362 int connection_id = -1;
1366 slot = ca->next_read_slot;
1367 while ((slot_count < ca->slot_count) && (!found)) {
1368 if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING)
1371 if (ca->slot_info[slot].rx_buffer.data == NULL) {
1375 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1377 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2);
1378 if (connection_id == -1)
1379 connection_id = hdr[0];
1380 if ((hdr[0] == connection_id) && ((hdr[1] & 0x80) == 0)) {
1386 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1390 slot = (slot + 1) % ca->slot_count;
1394 ca->next_read_slot = slot;
1400 * Implementation of read() syscall.
1402 * @param file File structure.
1403 * @param buf Destination buffer.
1404 * @param count Size of destination buffer.
1405 * @param ppos Position in file (ignored).
1407 * @return Number of bytes read, or <0 on error.
1409 static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user * buf,
1410 size_t count, loff_t * ppos)
1412 struct dvb_device *dvbdev = file->private_data;
1413 struct dvb_ca_private *ca = dvbdev->priv;
1418 int connection_id = -1;
1420 int last_fragment = 0;
1425 dprintk("%s\n", __func__);
1427 /* Outgoing packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */
1431 /* wait for some data */
1432 if ((status = dvb_ca_en50221_io_read_condition(ca, &result, &slot)) == 0) {
1434 /* if we're in nonblocking mode, exit immediately */
1435 if (file->f_flags & O_NONBLOCK)
1436 return -EWOULDBLOCK;
1438 /* wait for some data */
1439 status = wait_event_interruptible(ca->wait_queue,
1440 dvb_ca_en50221_io_read_condition
1441 (ca, &result, &slot));
1443 if ((status < 0) || (result < 0)) {
1449 idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen);
1453 printk("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n", ca->dvbdev->adapter->num);
1458 dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2);
1459 if (connection_id == -1)
1460 connection_id = hdr[0];
1461 if (hdr[0] == connection_id) {
1462 if (pktlen < count) {
1463 if ((pktlen + fraglen - 2) > count) {
1464 fraglen = count - pktlen;
1469 if ((status = dvb_ringbuffer_pkt_read_user(&ca->slot_info[slot].rx_buffer, idx, 2,
1470 buf + pktlen, fraglen)) < 0) {
1476 if ((hdr[1] & 0x80) == 0)
1481 idx2 = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen);
1483 dvb_ringbuffer_pkt_dispose(&ca->slot_info[slot].rx_buffer, idx);
1486 } while (!last_fragment);
1489 hdr[1] = connection_id;
1490 if ((status = copy_to_user(buf, hdr, 2)) != 0)
1500 * Implementation of file open syscall.
1502 * @param inode Inode concerned.
1503 * @param file File concerned.
1505 * @return 0 on success, <0 on failure.
1507 static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file)
1509 struct dvb_device *dvbdev = file->private_data;
1510 struct dvb_ca_private *ca = dvbdev->priv;
1514 dprintk("%s\n", __func__);
1516 if (!try_module_get(ca->pub->owner))
1519 err = dvb_generic_open(inode, file);
1521 module_put(ca->pub->owner);
1525 for (i = 0; i < ca->slot_count; i++) {
1527 if (ca->slot_info[i].slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1528 if (ca->slot_info[i].rx_buffer.data != NULL) {
1529 /* it is safe to call this here without locks because
1530 * ca->open == 0. Data is not read in this case */
1531 dvb_ringbuffer_flush(&ca->slot_info[i].rx_buffer);
1537 dvb_ca_en50221_thread_update_delay(ca);
1538 dvb_ca_en50221_thread_wakeup(ca);
1545 * Implementation of file close syscall.
1547 * @param inode Inode concerned.
1548 * @param file File concerned.
1550 * @return 0 on success, <0 on failure.
1552 static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file)
1554 struct dvb_device *dvbdev = file->private_data;
1555 struct dvb_ca_private *ca = dvbdev->priv;
1558 dprintk("%s\n", __func__);
1560 /* mark the CA device as closed */
1562 dvb_ca_en50221_thread_update_delay(ca);
1564 err = dvb_generic_release(inode, file);
1566 module_put(ca->pub->owner);
1573 * Implementation of poll() syscall.
1575 * @param file File concerned.
1576 * @param wait poll wait table.
1578 * @return Standard poll mask.
1580 static unsigned int dvb_ca_en50221_io_poll(struct file *file, poll_table * wait)
1582 struct dvb_device *dvbdev = file->private_data;
1583 struct dvb_ca_private *ca = dvbdev->priv;
1584 unsigned int mask = 0;
1588 dprintk("%s\n", __func__);
1590 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1594 /* if there is something, return now */
1598 /* wait for something to happen */
1599 poll_wait(file, &ca->wait_queue, wait);
1601 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) {
1607 EXPORT_SYMBOL(dvb_ca_en50221_init);
1610 static const struct file_operations dvb_ca_fops = {
1611 .owner = THIS_MODULE,
1612 .read = dvb_ca_en50221_io_read,
1613 .write = dvb_ca_en50221_io_write,
1614 .ioctl = dvb_ca_en50221_io_ioctl,
1615 .open = dvb_ca_en50221_io_open,
1616 .release = dvb_ca_en50221_io_release,
1617 .poll = dvb_ca_en50221_io_poll,
1620 static struct dvb_device dvbdev_ca = {
1625 .fops = &dvb_ca_fops,
1629 /* ******************************************************************************** */
1630 /* Initialisation/shutdown functions */
1634 * Initialise a new DVB CA EN50221 interface device.
1636 * @param dvb_adapter DVB adapter to attach the new CA device to.
1637 * @param ca The dvb_ca instance.
1638 * @param flags Flags describing the CA device (DVB_CA_FLAG_*).
1639 * @param slot_count Number of slots supported.
1641 * @return 0 on success, nonzero on failure
1643 int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter,
1644 struct dvb_ca_en50221 *pubca, int flags, int slot_count)
1647 struct dvb_ca_private *ca = NULL;
1650 dprintk("%s\n", __func__);
1655 /* initialise the system data */
1656 if ((ca = kzalloc(sizeof(struct dvb_ca_private), GFP_KERNEL)) == NULL) {
1662 ca->slot_count = slot_count;
1663 if ((ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot), GFP_KERNEL)) == NULL) {
1667 init_waitqueue_head(&ca->wait_queue);
1670 ca->next_read_slot = 0;
1671 pubca->private = ca;
1673 /* register the DVB device */
1674 ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, DVB_DEVICE_CA);
1678 /* now initialise each slot */
1679 for (i = 0; i < slot_count; i++) {
1680 memset(&ca->slot_info[i], 0, sizeof(struct dvb_ca_slot));
1681 ca->slot_info[i].slot_state = DVB_CA_SLOTSTATE_NONE;
1682 atomic_set(&ca->slot_info[i].camchange_count, 0);
1683 ca->slot_info[i].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
1684 mutex_init(&ca->slot_info[i].slot_lock);
1687 if (signal_pending(current)) {
1693 /* create a kthread for monitoring this CA device */
1694 ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i",
1695 ca->dvbdev->adapter->num, ca->dvbdev->id);
1696 if (IS_ERR(ca->thread)) {
1697 ret = PTR_ERR(ca->thread);
1698 printk("dvb_ca_init: failed to start kernel_thread (%d)\n",
1706 if (ca->dvbdev != NULL)
1707 dvb_unregister_device(ca->dvbdev);
1708 kfree(ca->slot_info);
1711 pubca->private = NULL;
1714 EXPORT_SYMBOL(dvb_ca_en50221_release);
1719 * Release a DVB CA EN50221 interface device.
1721 * @param ca_dev The dvb_device_t instance for the CA device.
1722 * @param ca The associated dvb_ca instance.
1724 void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca)
1726 struct dvb_ca_private *ca = pubca->private;
1729 dprintk("%s\n", __func__);
1731 /* shutdown the thread if there was one */
1732 kthread_stop(ca->thread);
1734 for (i = 0; i < ca->slot_count; i++) {
1735 dvb_ca_en50221_slot_shutdown(ca, i);
1736 vfree(ca->slot_info[i].rx_buffer.data);
1738 kfree(ca->slot_info);
1739 dvb_unregister_device(ca->dvbdev);
1741 pubca->private = NULL;