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.
24 * To obtain the license, point your browser to
25 * http://www.gnu.org/copyleft/gpl.html
28 #define pr_fmt(fmt) "dvb_ca_en50221: " fmt
30 #include <linux/errno.h>
31 #include <linux/slab.h>
32 #include <linux/list.h>
33 #include <linux/module.h>
34 #include <linux/vmalloc.h>
35 #include <linux/delay.h>
36 #include <linux/spinlock.h>
37 #include <linux/sched/signal.h>
38 #include <linux/kthread.h>
40 #include <media/dvb_ca_en50221.h>
41 #include <media/dvb_ringbuffer.h>
43 static int dvb_ca_en50221_debug;
45 module_param_named(cam_debug, dvb_ca_en50221_debug, int, 0644);
46 MODULE_PARM_DESC(cam_debug, "enable verbose debug messages");
48 #define dprintk(fmt, arg...) do { \
49 if (dvb_ca_en50221_debug) \
50 printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg);\
53 #define INIT_TIMEOUT_SECS 10
55 #define HOST_LINK_BUF_SIZE 0x200
57 #define RX_BUFFER_SIZE 65535
59 #define MAX_RX_PACKETS_PER_ITERATION 10
62 #define CTRLIF_COMMAND 1
63 #define CTRLIF_STATUS 1
64 #define CTRLIF_SIZE_LOW 2
65 #define CTRLIF_SIZE_HIGH 3
67 #define CMDREG_HC 1 /* Host control */
68 #define CMDREG_SW 2 /* Size write */
69 #define CMDREG_SR 4 /* Size read */
70 #define CMDREG_RS 8 /* Reset interface */
71 #define CMDREG_FRIE 0x40 /* Enable FR interrupt */
72 #define CMDREG_DAIE 0x80 /* Enable DA interrupt */
73 #define IRQEN (CMDREG_DAIE)
75 #define STATUSREG_RE 1 /* read error */
76 #define STATUSREG_WE 2 /* write error */
77 #define STATUSREG_FR 0x40 /* module free */
78 #define STATUSREG_DA 0x80 /* data available */
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
89 /* Information on a CA slot */
91 /* current state of the CAM */
94 /* mutex used for serializing access to one CI slot */
95 struct mutex slot_lock;
97 /* Number of CAMCHANGES that have occurred since last processing */
98 atomic_t camchange_count;
100 /* Type of last CAMCHANGE */
103 /* base address of CAM config */
106 /* value to write into Config Control register */
109 /* if 1, the CAM supports DA IRQs */
110 u8 da_irq_supported:1;
112 /* size of the buffer to use when talking to the CAM */
115 /* buffer for incoming packets */
116 struct dvb_ringbuffer rx_buffer;
118 /* timer used during various states of the slot */
119 unsigned long timeout;
122 /* Private CA-interface information */
123 struct dvb_ca_private {
124 struct kref refcount;
126 /* pointer back to the public data structure */
127 struct dvb_ca_en50221 *pub;
130 struct dvb_device *dvbdev;
132 /* Flags describing the interface (DVB_CA_FLAG_*) */
135 /* number of slots supported by this CA interface */
136 unsigned int slot_count;
138 /* information on each slot */
139 struct dvb_ca_slot *slot_info;
141 /* wait queues for read() and write() operations */
142 wait_queue_head_t wait_queue;
144 /* PID of the monitoring thread */
145 struct task_struct *thread;
147 /* Flag indicating if the CA device is open */
150 /* Flag indicating the thread should wake up now */
151 unsigned int wakeup:1;
153 /* Delay the main thread should use */
157 * Slot to start looking for data to read from in the next user-space
162 /* mutex serializing ioctls */
163 struct mutex ioctl_mutex;
166 static void dvb_ca_private_free(struct dvb_ca_private *ca)
170 dvb_free_device(ca->dvbdev);
171 for (i = 0; i < ca->slot_count; i++)
172 vfree(ca->slot_info[i].rx_buffer.data);
174 kfree(ca->slot_info);
178 static void dvb_ca_private_release(struct kref *ref)
180 struct dvb_ca_private *ca;
182 ca = container_of(ref, struct dvb_ca_private, refcount);
183 dvb_ca_private_free(ca);
186 static void dvb_ca_private_get(struct dvb_ca_private *ca)
188 kref_get(&ca->refcount);
191 static void dvb_ca_private_put(struct dvb_ca_private *ca)
193 kref_put(&ca->refcount, dvb_ca_private_release);
196 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca);
197 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot,
198 u8 *ebuf, int ecount);
199 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot,
200 u8 *ebuf, int ecount);
203 * Safely find needle in haystack.
205 * @haystack: Buffer to look in.
206 * @hlen: Number of bytes in haystack.
207 * @needle: Buffer to find.
208 * @nlen: Number of bytes in needle.
209 * return: Pointer into haystack needle was found at, or NULL if not found.
211 static char *findstr(char *haystack, int hlen, char *needle, int nlen)
218 for (i = 0; i <= hlen - nlen; i++) {
219 if (!strncmp(haystack + i, needle, nlen))
226 /* ************************************************************************** */
227 /* EN50221 physical interface functions */
230 * dvb_ca_en50221_check_camstatus - Check CAM status.
232 static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot)
234 struct dvb_ca_slot *sl = &ca->slot_info[slot];
240 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)
241 return (atomic_read(&sl->camchange_count) != 0);
244 slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open);
246 cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0;
247 cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0;
249 int cam_present_old = (sl->slot_state != DVB_CA_SLOTSTATE_NONE);
251 cam_changed = (cam_present_now != cam_present_old);
255 if (!cam_present_now)
256 sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
258 sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED;
259 atomic_set(&sl->camchange_count, 1);
261 if ((sl->slot_state == DVB_CA_SLOTSTATE_WAITREADY) &&
262 (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) {
263 /* move to validate state if reset is completed */
264 sl->slot_state = DVB_CA_SLOTSTATE_VALIDATE;
272 * dvb_ca_en50221_wait_if_status - Wait for flags to become set on the STATUS
273 * register on a CAM interface, checking for errors and timeout.
276 * @slot: Slot on interface.
277 * @waitfor: Flags to wait for.
278 * @timeout_hz: Timeout in milliseconds.
280 * return: 0 on success, nonzero on error.
282 static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot,
283 u8 waitfor, int timeout_hz)
285 unsigned long timeout;
288 dprintk("%s\n", __func__);
290 /* loop until timeout elapsed */
292 timeout = jiffies + timeout_hz;
296 /* read the status and check for error */
297 res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
301 /* if we got the flags, it was successful! */
303 dprintk("%s succeeded timeout:%lu\n",
304 __func__, jiffies - start);
308 /* check for timeout */
309 if (time_after(jiffies, timeout))
313 usleep_range(1000, 1100);
316 dprintk("%s failed timeout:%lu\n", __func__, jiffies - start);
318 /* if we get here, we've timed out */
323 * dvb_ca_en50221_link_init - Initialise the link layer connection to a CAM.
328 * return: 0 on success, nonzero on failure.
330 static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot)
332 struct dvb_ca_slot *sl = &ca->slot_info[slot];
337 dprintk("%s\n", __func__);
339 /* we'll be determining these during this function */
340 sl->da_irq_supported = 0;
343 * set the host link buffer size temporarily. it will be overwritten
344 * with the real negotiated size later.
346 sl->link_buf_size = 2;
348 /* read the buffer size from the CAM */
349 ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
353 ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ);
356 ret = dvb_ca_en50221_read_data(ca, slot, buf, 2);
359 ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
364 * store it, and choose the minimum of our buffer and the CAM's buffer
367 buf_size = (buf[0] << 8) | buf[1];
368 if (buf_size > HOST_LINK_BUF_SIZE)
369 buf_size = HOST_LINK_BUF_SIZE;
370 sl->link_buf_size = buf_size;
371 buf[0] = buf_size >> 8;
372 buf[1] = buf_size & 0xff;
373 dprintk("Chosen link buffer size of %i\n", buf_size);
375 /* write the buffer size to the CAM */
376 ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
380 ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10);
383 ret = dvb_ca_en50221_write_data(ca, slot, buf, 2);
386 ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
395 * dvb_ca_en50221_read_tuple - Read a tuple from attribute memory.
399 * @address: Address to read from. Updated.
400 * @tuple_type: Tuple id byte. Updated.
401 * @tuple_length: Tuple length. Updated.
402 * @tuple: Dest buffer for tuple (must be 256 bytes). Updated.
404 * return: 0 on success, nonzero on error.
406 static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot,
407 int *address, int *tuple_type,
408 int *tuple_length, u8 *tuple)
413 int _address = *address;
415 /* grab the next tuple length and type */
416 _tuple_type = ca->pub->read_attribute_mem(ca->pub, slot, _address);
419 if (_tuple_type == 0xff) {
420 dprintk("END OF CHAIN TUPLE type:0x%x\n", _tuple_type);
422 *tuple_type = _tuple_type;
426 _tuple_length = ca->pub->read_attribute_mem(ca->pub, slot,
428 if (_tuple_length < 0)
429 return _tuple_length;
432 dprintk("TUPLE type:0x%x length:%i\n", _tuple_type, _tuple_length);
434 /* read in the whole tuple */
435 for (i = 0; i < _tuple_length; i++) {
436 tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot,
438 dprintk(" 0x%02x: 0x%02x %c\n",
440 ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.');
442 _address += (_tuple_length * 2);
445 *tuple_type = _tuple_type;
446 *tuple_length = _tuple_length;
452 * dvb_ca_en50221_parse_attributes - Parse attribute memory of a CAM module,
453 * extracting Config register, and checking it is a DVB CAM module.
458 * return: 0 on success, <0 on failure.
460 static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot)
462 struct dvb_ca_slot *sl;
470 int got_cftableentry = 0;
476 /* CISTPL_DEVICE_0A */
477 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
478 &tuple_length, tuple);
481 if (tuple_type != 0x1D)
484 /* CISTPL_DEVICE_0C */
485 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
486 &tuple_length, tuple);
489 if (tuple_type != 0x1C)
493 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
494 &tuple_length, tuple);
497 if (tuple_type != 0x15)
501 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
502 &tuple_length, tuple);
505 if (tuple_type != 0x20)
507 if (tuple_length != 4)
509 manfid = (tuple[1] << 8) | tuple[0];
510 devid = (tuple[3] << 8) | tuple[2];
513 status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
514 &tuple_length, tuple);
517 if (tuple_type != 0x1A)
519 if (tuple_length < 3)
522 /* extract the configbase */
524 if (tuple_length < (3 + rasz + 14))
526 sl = &ca->slot_info[slot];
528 for (i = 0; i < rasz + 1; i++)
529 sl->config_base |= (tuple[2 + i] << (8 * i));
531 /* check it contains the correct DVB string */
532 dvb_str = findstr((char *)tuple, tuple_length, "DVB_CI_V", 8);
535 if (tuple_length < ((dvb_str - (char *)tuple) + 12))
538 /* is it a version we support? */
539 if (strncmp(dvb_str + 8, "1.00", 4)) {
540 pr_err("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n",
541 ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9],
542 dvb_str[10], dvb_str[11]);
546 /* process the CFTABLE_ENTRY tuples, and any after those */
547 while ((!end_chain) && (address < 0x1000)) {
548 status = dvb_ca_en50221_read_tuple(ca, slot, &address,
549 &tuple_type, &tuple_length,
553 switch (tuple_type) {
554 case 0x1B: /* CISTPL_CFTABLE_ENTRY */
555 if (tuple_length < (2 + 11 + 17))
558 /* if we've already parsed one, just use it */
559 if (got_cftableentry)
562 /* get the config option */
563 sl->config_option = tuple[0] & 0x3f;
565 /* OK, check it contains the correct strings */
566 if (!findstr((char *)tuple, tuple_length,
568 !findstr((char *)tuple, tuple_length,
569 "DVB_CI_MODULE", 13))
572 got_cftableentry = 1;
575 case 0x14: /* CISTPL_NO_LINK */
578 case 0xFF: /* CISTPL_END */
582 default: /* Unknown tuple type - just skip this tuple */
583 dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n",
584 tuple_type, tuple_length);
589 if ((address > 0x1000) || (!got_cftableentry))
592 dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n",
593 manfid, devid, sl->config_base, sl->config_option);
600 * dvb_ca_en50221_set_configoption - Set CAM's configoption correctly.
603 * @slot: Slot containing the CAM.
605 static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot)
607 struct dvb_ca_slot *sl = &ca->slot_info[slot];
610 dprintk("%s\n", __func__);
612 /* set the config option */
613 ca->pub->write_attribute_mem(ca->pub, slot, sl->config_base,
617 configoption = ca->pub->read_attribute_mem(ca->pub, slot,
619 dprintk("Set configoption 0x%x, read configoption 0x%x\n",
620 sl->config_option, configoption & 0x3f);
627 * dvb_ca_en50221_read_data - This function talks to an EN50221 CAM control
628 * interface. It reads a buffer of data from the CAM. The data can either
629 * be stored in a supplied buffer, or automatically be added to the slot's
633 * @slot: Slot to read from.
634 * @ebuf: If non-NULL, the data will be written to this buffer. If NULL,
635 * the data will be added into the buffering system as a normal
637 * @ecount: Size of ebuf. Ignored if ebuf is NULL.
639 * return: Number of bytes read, or < 0 on error
641 static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot,
642 u8 *ebuf, int ecount)
644 struct dvb_ca_slot *sl = &ca->slot_info[slot];
647 u8 buf[HOST_LINK_BUF_SIZE];
650 dprintk("%s\n", __func__);
652 /* check if we have space for a link buf in the rx_buffer */
656 if (!sl->rx_buffer.data) {
660 buf_free = dvb_ringbuffer_free(&sl->rx_buffer);
662 if (buf_free < (sl->link_buf_size +
663 DVB_RINGBUFFER_PKTHDRSIZE)) {
669 if (ca->pub->read_data &&
670 (sl->slot_state != DVB_CA_SLOTSTATE_LINKINIT)) {
672 status = ca->pub->read_data(ca->pub, slot, buf,
675 status = ca->pub->read_data(ca->pub, slot, buf, ecount);
682 /* check if there is data available */
683 status = ca->pub->read_cam_control(ca->pub, slot,
687 if (!(status & STATUSREG_DA)) {
693 /* read the amount of data */
694 status = ca->pub->read_cam_control(ca->pub, slot,
698 bytes_read = status << 8;
699 status = ca->pub->read_cam_control(ca->pub, slot,
703 bytes_read |= status;
705 /* check it will fit */
707 if (bytes_read > sl->link_buf_size) {
708 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n",
709 ca->dvbdev->adapter->num, bytes_read,
711 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT;
715 if (bytes_read < 2) {
716 pr_err("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n",
717 ca->dvbdev->adapter->num);
718 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT;
723 if (bytes_read > ecount) {
724 pr_err("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n",
725 ca->dvbdev->adapter->num);
731 /* fill the buffer */
732 for (i = 0; i < bytes_read; i++) {
733 /* read byte and check */
734 status = ca->pub->read_cam_control(ca->pub, slot,
739 /* OK, store it in the buffer */
743 /* check for read error (RE should now be 0) */
744 status = ca->pub->read_cam_control(ca->pub, slot,
748 if (status & STATUSREG_RE) {
749 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT;
756 * OK, add it to the receive buffer, or copy into external buffer if
760 if (!sl->rx_buffer.data) {
764 dvb_ringbuffer_pkt_write(&sl->rx_buffer, buf, bytes_read);
766 memcpy(ebuf, buf, bytes_read);
769 dprintk("Received 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_read);
772 /* wake up readers when a last_fragment is received */
773 if ((buf[1] & 0x80) == 0x00)
774 wake_up_interruptible(&ca->wait_queue);
783 * dvb_ca_en50221_write_data - This function talks to an EN50221 CAM control
784 * interface. It writes a buffer of data to a CAM.
787 * @slot: Slot to write to.
788 * @buf: The data in this buffer is treated as a complete link-level packet to
790 * @bytes_write: Size of ebuf.
792 * return: Number of bytes written, or < 0 on error.
794 static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot,
795 u8 *buf, int bytes_write)
797 struct dvb_ca_slot *sl = &ca->slot_info[slot];
801 dprintk("%s\n", __func__);
804 if (bytes_write > sl->link_buf_size)
807 if (ca->pub->write_data &&
808 (sl->slot_state != DVB_CA_SLOTSTATE_LINKINIT))
809 return ca->pub->write_data(ca->pub, slot, buf, bytes_write);
812 * it is possible we are dealing with a single buffer implementation,
813 * thus if there is data available for read or if there is even a read
814 * already in progress, we do nothing but awake the kernel thread to
815 * process the data if necessary.
817 status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
820 if (status & (STATUSREG_DA | STATUSREG_RE)) {
821 if (status & STATUSREG_DA)
822 dvb_ca_en50221_thread_wakeup(ca);
829 status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
834 /* check if interface is still free */
835 status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
838 if (!(status & STATUSREG_FR)) {
839 /* it wasn't free => try again later */
845 * It may need some time for the CAM to settle down, or there might
846 * be a race condition between the CAM, writing HC and our last
847 * check for DA. This happens, if the CAM asserts DA, just after
848 * checking DA before we are setting HC. In this case it might be
849 * a bug in the CAM to keep the FR bit, the lower layer/HW
850 * communication requires a longer timeout or the CAM needs more
851 * time internally. But this happens in reality!
852 * We need to read the status from the HW again and do the same
853 * we did for the previous check for DA
855 status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
859 if (status & (STATUSREG_DA | STATUSREG_RE)) {
860 if (status & STATUSREG_DA)
861 dvb_ca_en50221_thread_wakeup(ca);
867 /* send the amount of data */
868 status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH,
872 status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW,
877 /* send the buffer */
878 for (i = 0; i < bytes_write; i++) {
879 status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA,
885 /* check for write error (WE should now be 0) */
886 status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
889 if (status & STATUSREG_WE) {
890 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT;
894 status = bytes_write;
896 dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot,
897 buf[0], (buf[1] & 0x80) == 0, bytes_write);
900 ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
906 /* ************************************************************************** */
907 /* EN50221 higher level functions */
910 * dvb_ca_en50221_slot_shutdown - A CAM has been removed => shut it down.
913 * @slot: Slot to shut down.
915 static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot)
917 dprintk("%s\n", __func__);
919 ca->pub->slot_shutdown(ca->pub, slot);
920 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
923 * need to wake up all processes to check if they're now trying to
924 * write to a defunct CAM
926 wake_up_interruptible(&ca->wait_queue);
928 dprintk("Slot %i shutdown\n", slot);
935 * dvb_ca_en50221_camchange_irq - A CAMCHANGE IRQ has occurred.
937 * @pubca: CA instance.
938 * @slot: Slot concerned.
939 * @change_type: One of the DVB_CA_CAMCHANGE_* values.
941 void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot,
944 struct dvb_ca_private *ca = pubca->private;
945 struct dvb_ca_slot *sl = &ca->slot_info[slot];
947 dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type);
949 switch (change_type) {
950 case DVB_CA_EN50221_CAMCHANGE_REMOVED:
951 case DVB_CA_EN50221_CAMCHANGE_INSERTED:
958 sl->camchange_type = change_type;
959 atomic_inc(&sl->camchange_count);
960 dvb_ca_en50221_thread_wakeup(ca);
962 EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq);
965 * dvb_ca_en50221_camready_irq - A CAMREADY IRQ has occurred.
967 * @pubca: CA instance.
968 * @slot: Slot concerned.
970 void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot)
972 struct dvb_ca_private *ca = pubca->private;
973 struct dvb_ca_slot *sl = &ca->slot_info[slot];
975 dprintk("CAMREADY IRQ slot:%i\n", slot);
977 if (sl->slot_state == DVB_CA_SLOTSTATE_WAITREADY) {
978 sl->slot_state = DVB_CA_SLOTSTATE_VALIDATE;
979 dvb_ca_en50221_thread_wakeup(ca);
982 EXPORT_SYMBOL(dvb_ca_en50221_camready_irq);
985 * dvb_ca_en50221_frda_irq - An FR or DA IRQ has occurred.
987 * @pubca: CA instance.
988 * @slot: Slot concerned.
990 void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot)
992 struct dvb_ca_private *ca = pubca->private;
993 struct dvb_ca_slot *sl = &ca->slot_info[slot];
996 dprintk("FR/DA IRQ slot:%i\n", slot);
998 switch (sl->slot_state) {
999 case DVB_CA_SLOTSTATE_LINKINIT:
1000 flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS);
1001 if (flags & STATUSREG_DA) {
1002 dprintk("CAM supports DA IRQ\n");
1003 sl->da_irq_supported = 1;
1007 case DVB_CA_SLOTSTATE_RUNNING:
1009 dvb_ca_en50221_thread_wakeup(ca);
1013 EXPORT_SYMBOL(dvb_ca_en50221_frda_irq);
1015 /* ************************************************************************** */
1016 /* EN50221 thread functions */
1019 * Wake up the DVB CA thread
1023 static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca)
1025 dprintk("%s\n", __func__);
1029 wake_up_process(ca->thread);
1033 * Update the delay used by the thread.
1037 static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca)
1040 int curdelay = 100000000;
1044 * Beware of too high polling frequency, because one polling
1045 * call might take several hundred milliseconds until timeout!
1047 for (slot = 0; slot < ca->slot_count; slot++) {
1048 struct dvb_ca_slot *sl = &ca->slot_info[slot];
1050 switch (sl->slot_state) {
1052 case DVB_CA_SLOTSTATE_NONE:
1053 delay = HZ * 60; /* 60s */
1054 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
1055 delay = HZ * 5; /* 5s */
1057 case DVB_CA_SLOTSTATE_INVALID:
1058 delay = HZ * 60; /* 60s */
1059 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
1060 delay = HZ / 10; /* 100ms */
1063 case DVB_CA_SLOTSTATE_UNINITIALISED:
1064 case DVB_CA_SLOTSTATE_WAITREADY:
1065 case DVB_CA_SLOTSTATE_VALIDATE:
1066 case DVB_CA_SLOTSTATE_WAITFR:
1067 case DVB_CA_SLOTSTATE_LINKINIT:
1068 delay = HZ / 10; /* 100ms */
1071 case DVB_CA_SLOTSTATE_RUNNING:
1072 delay = HZ * 60; /* 60s */
1073 if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE))
1074 delay = HZ / 10; /* 100ms */
1076 if ((!sl->da_irq_supported) ||
1077 (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA)))
1078 delay = HZ / 10; /* 100ms */
1083 if (delay < curdelay)
1087 ca->delay = curdelay;
1091 * Poll if the CAM is gone.
1094 * @slot: Slot to process.
1095 * return:: 0 .. no change
1096 * 1 .. CAM state changed
1099 static int dvb_ca_en50221_poll_cam_gone(struct dvb_ca_private *ca, int slot)
1105 * we need this extra check for annoying interfaces like the
1108 if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) &&
1109 (ca->pub->poll_slot_status)) {
1110 status = ca->pub->poll_slot_status(ca->pub, slot, 0);
1112 DVB_CA_EN50221_POLL_CAM_PRESENT)) {
1113 ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE;
1114 dvb_ca_en50221_thread_update_delay(ca);
1122 * Thread state machine for one CA slot to perform the data transfer.
1125 * @slot: Slot to process.
1127 static void dvb_ca_en50221_thread_state_machine(struct dvb_ca_private *ca,
1130 struct dvb_ca_slot *sl = &ca->slot_info[slot];
1135 mutex_lock(&sl->slot_lock);
1137 /* check the cam status + deal with CAMCHANGEs */
1138 while (dvb_ca_en50221_check_camstatus(ca, slot)) {
1139 /* clear down an old CI slot if necessary */
1140 if (sl->slot_state != DVB_CA_SLOTSTATE_NONE)
1141 dvb_ca_en50221_slot_shutdown(ca, slot);
1143 /* if a CAM is NOW present, initialise it */
1144 if (sl->camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED)
1145 sl->slot_state = DVB_CA_SLOTSTATE_UNINITIALISED;
1147 /* we've handled one CAMCHANGE */
1148 dvb_ca_en50221_thread_update_delay(ca);
1149 atomic_dec(&sl->camchange_count);
1152 /* CAM state machine */
1153 switch (sl->slot_state) {
1154 case DVB_CA_SLOTSTATE_NONE:
1155 case DVB_CA_SLOTSTATE_INVALID:
1156 /* no action needed */
1159 case DVB_CA_SLOTSTATE_UNINITIALISED:
1160 sl->slot_state = DVB_CA_SLOTSTATE_WAITREADY;
1161 ca->pub->slot_reset(ca->pub, slot);
1162 sl->timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1165 case DVB_CA_SLOTSTATE_WAITREADY:
1166 if (time_after(jiffies, sl->timeout)) {
1167 pr_err("dvb_ca adaptor %d: PC card did not respond :(\n",
1168 ca->dvbdev->adapter->num);
1169 sl->slot_state = DVB_CA_SLOTSTATE_INVALID;
1170 dvb_ca_en50221_thread_update_delay(ca);
1174 * no other action needed; will automatically change state when
1179 case DVB_CA_SLOTSTATE_VALIDATE:
1180 if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) {
1181 if (dvb_ca_en50221_poll_cam_gone(ca, slot))
1184 pr_err("dvb_ca adapter %d: Invalid PC card inserted :(\n",
1185 ca->dvbdev->adapter->num);
1186 sl->slot_state = DVB_CA_SLOTSTATE_INVALID;
1187 dvb_ca_en50221_thread_update_delay(ca);
1190 if (dvb_ca_en50221_set_configoption(ca, slot) != 0) {
1191 pr_err("dvb_ca adapter %d: Unable to initialise CAM :(\n",
1192 ca->dvbdev->adapter->num);
1193 sl->slot_state = DVB_CA_SLOTSTATE_INVALID;
1194 dvb_ca_en50221_thread_update_delay(ca);
1197 if (ca->pub->write_cam_control(ca->pub, slot,
1200 pr_err("dvb_ca adapter %d: Unable to reset CAM IF\n",
1201 ca->dvbdev->adapter->num);
1202 sl->slot_state = DVB_CA_SLOTSTATE_INVALID;
1203 dvb_ca_en50221_thread_update_delay(ca);
1206 dprintk("DVB CAM validated successfully\n");
1208 sl->timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
1209 sl->slot_state = DVB_CA_SLOTSTATE_WAITFR;
1213 case DVB_CA_SLOTSTATE_WAITFR:
1214 if (time_after(jiffies, sl->timeout)) {
1215 pr_err("dvb_ca adapter %d: DVB CAM did not respond :(\n",
1216 ca->dvbdev->adapter->num);
1217 sl->slot_state = DVB_CA_SLOTSTATE_INVALID;
1218 dvb_ca_en50221_thread_update_delay(ca);
1222 flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
1223 if (flags & STATUSREG_FR) {
1224 sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT;
1229 case DVB_CA_SLOTSTATE_LINKINIT:
1230 if (dvb_ca_en50221_link_init(ca, slot) != 0) {
1231 if (dvb_ca_en50221_poll_cam_gone(ca, slot))
1234 pr_err("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n",
1235 ca->dvbdev->adapter->num);
1236 sl->slot_state = DVB_CA_SLOTSTATE_UNINITIALISED;
1237 dvb_ca_en50221_thread_update_delay(ca);
1241 if (!sl->rx_buffer.data) {
1242 rxbuf = vmalloc(RX_BUFFER_SIZE);
1244 pr_err("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n",
1245 ca->dvbdev->adapter->num);
1246 sl->slot_state = DVB_CA_SLOTSTATE_INVALID;
1247 dvb_ca_en50221_thread_update_delay(ca);
1250 dvb_ringbuffer_init(&sl->rx_buffer, rxbuf,
1254 ca->pub->slot_ts_enable(ca->pub, slot);
1255 sl->slot_state = DVB_CA_SLOTSTATE_RUNNING;
1256 dvb_ca_en50221_thread_update_delay(ca);
1257 pr_info("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n",
1258 ca->dvbdev->adapter->num);
1261 case DVB_CA_SLOTSTATE_RUNNING:
1265 /* poll slots for data */
1267 while (dvb_ca_en50221_read_data(ca, slot, NULL, 0) > 0) {
1272 * if a CAMCHANGE occurred at some point, do not do any
1273 * more processing of this slot
1275 if (dvb_ca_en50221_check_camstatus(ca, slot)) {
1277 * we don't want to sleep on the next iteration
1278 * so we can handle the cam change
1284 /* check if we've hit our limit this time */
1285 if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) {
1287 * don't sleep; there is likely to be more data
1297 mutex_unlock(&sl->slot_lock);
1301 * Kernel thread which monitors CA slots for CAM changes, and performs data
1304 static int dvb_ca_en50221_thread(void *data)
1306 struct dvb_ca_private *ca = data;
1309 dprintk("%s\n", __func__);
1311 /* choose the correct initial delay */
1312 dvb_ca_en50221_thread_update_delay(ca);
1315 while (!kthread_should_stop()) {
1316 /* sleep for a bit */
1318 set_current_state(TASK_INTERRUPTIBLE);
1319 schedule_timeout(ca->delay);
1320 if (kthread_should_stop())
1325 /* go through all the slots processing them */
1326 for (slot = 0; slot < ca->slot_count; slot++)
1327 dvb_ca_en50221_thread_state_machine(ca, slot);
1333 /* ************************************************************************** */
1334 /* EN50221 IO interface functions */
1337 * Real ioctl implementation.
1338 * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them.
1340 * @file: File concerned.
1341 * @cmd: IOCTL command.
1342 * @parg: Associated argument.
1344 * return: 0 on success, <0 on error.
1346 static int dvb_ca_en50221_io_do_ioctl(struct file *file,
1347 unsigned int cmd, void *parg)
1349 struct dvb_device *dvbdev = file->private_data;
1350 struct dvb_ca_private *ca = dvbdev->priv;
1354 dprintk("%s\n", __func__);
1356 if (mutex_lock_interruptible(&ca->ioctl_mutex))
1357 return -ERESTARTSYS;
1361 for (slot = 0; slot < ca->slot_count; slot++) {
1362 struct dvb_ca_slot *sl = &ca->slot_info[slot];
1364 mutex_lock(&sl->slot_lock);
1365 if (sl->slot_state != DVB_CA_SLOTSTATE_NONE) {
1366 dvb_ca_en50221_slot_shutdown(ca, slot);
1367 if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)
1368 dvb_ca_en50221_camchange_irq(ca->pub,
1370 DVB_CA_EN50221_CAMCHANGE_INSERTED);
1372 mutex_unlock(&sl->slot_lock);
1374 ca->next_read_slot = 0;
1375 dvb_ca_en50221_thread_wakeup(ca);
1379 struct ca_caps *caps = parg;
1381 caps->slot_num = ca->slot_count;
1382 caps->slot_type = CA_CI_LINK;
1383 caps->descr_num = 0;
1384 caps->descr_type = 0;
1388 case CA_GET_SLOT_INFO: {
1389 struct ca_slot_info *info = parg;
1390 struct dvb_ca_slot *sl;
1393 if ((slot > ca->slot_count) || (slot < 0)) {
1398 info->type = CA_CI_LINK;
1400 sl = &ca->slot_info[slot];
1401 if ((sl->slot_state != DVB_CA_SLOTSTATE_NONE) &&
1402 (sl->slot_state != DVB_CA_SLOTSTATE_INVALID)) {
1403 info->flags = CA_CI_MODULE_PRESENT;
1405 if (sl->slot_state == DVB_CA_SLOTSTATE_RUNNING)
1406 info->flags |= CA_CI_MODULE_READY;
1416 mutex_unlock(&ca->ioctl_mutex);
1421 * Wrapper for ioctl implementation.
1423 * @file: File concerned.
1424 * @cmd: IOCTL command.
1425 * @arg: Associated argument.
1427 * return: 0 on success, <0 on error.
1429 static long dvb_ca_en50221_io_ioctl(struct file *file,
1430 unsigned int cmd, unsigned long arg)
1432 return dvb_usercopy(file, cmd, arg, dvb_ca_en50221_io_do_ioctl);
1436 * Implementation of write() syscall.
1438 * @file: File structure.
1439 * @buf: Source buffer.
1440 * @count: Size of source buffer.
1441 * @ppos: Position in file (ignored).
1443 * return: Number of bytes read, or <0 on error.
1445 static ssize_t dvb_ca_en50221_io_write(struct file *file,
1446 const char __user *buf, size_t count,
1449 struct dvb_device *dvbdev = file->private_data;
1450 struct dvb_ca_private *ca = dvbdev->priv;
1451 struct dvb_ca_slot *sl;
1452 u8 slot, connection_id;
1454 u8 fragbuf[HOST_LINK_BUF_SIZE];
1457 unsigned long timeout;
1460 dprintk("%s\n", __func__);
1463 * Incoming packet has a 2 byte header.
1464 * hdr[0] = slot_id, hdr[1] = connection_id
1469 /* extract slot & connection id */
1470 if (copy_from_user(&slot, buf, 1))
1472 if (copy_from_user(&connection_id, buf + 1, 1))
1477 if (slot >= ca->slot_count)
1479 sl = &ca->slot_info[slot];
1481 /* check if the slot is actually running */
1482 if (sl->slot_state != DVB_CA_SLOTSTATE_RUNNING)
1485 /* fragment the packets & store in the buffer */
1486 while (fragpos < count) {
1487 fraglen = sl->link_buf_size - 2;
1490 if (fraglen > HOST_LINK_BUF_SIZE - 2)
1491 fraglen = HOST_LINK_BUF_SIZE - 2;
1492 if ((count - fragpos) < fraglen)
1493 fraglen = count - fragpos;
1495 fragbuf[0] = connection_id;
1496 fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00;
1497 status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen);
1503 timeout = jiffies + HZ / 2;
1505 while (!time_after(jiffies, timeout)) {
1507 * check the CAM hasn't been removed/reset in the
1510 if (sl->slot_state != DVB_CA_SLOTSTATE_RUNNING) {
1515 mutex_lock(&sl->slot_lock);
1516 status = dvb_ca_en50221_write_data(ca, slot, fragbuf,
1518 mutex_unlock(&sl->slot_lock);
1519 if (status == (fraglen + 2)) {
1523 if (status != -EAGAIN)
1526 usleep_range(1000, 1100);
1542 * Condition for waking up in dvb_ca_en50221_io_read_condition
1544 static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca,
1545 int *result, int *_slot)
1551 int connection_id = -1;
1555 slot = ca->next_read_slot;
1556 while ((slot_count < ca->slot_count) && (!found)) {
1557 struct dvb_ca_slot *sl = &ca->slot_info[slot];
1559 if (sl->slot_state != DVB_CA_SLOTSTATE_RUNNING)
1562 if (!sl->rx_buffer.data)
1565 idx = dvb_ringbuffer_pkt_next(&sl->rx_buffer, -1, &fraglen);
1567 dvb_ringbuffer_pkt_read(&sl->rx_buffer, idx, 0, hdr, 2);
1568 if (connection_id == -1)
1569 connection_id = hdr[0];
1570 if ((hdr[0] == connection_id) &&
1571 ((hdr[1] & 0x80) == 0)) {
1577 idx = dvb_ringbuffer_pkt_next(&sl->rx_buffer, idx,
1582 slot = (slot + 1) % ca->slot_count;
1586 ca->next_read_slot = slot;
1591 * Implementation of read() syscall.
1593 * @file: File structure.
1594 * @buf: Destination buffer.
1595 * @count: Size of destination buffer.
1596 * @ppos: Position in file (ignored).
1598 * return: Number of bytes read, or <0 on error.
1600 static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user *buf,
1601 size_t count, loff_t *ppos)
1603 struct dvb_device *dvbdev = file->private_data;
1604 struct dvb_ca_private *ca = dvbdev->priv;
1605 struct dvb_ca_slot *sl;
1610 int connection_id = -1;
1612 int last_fragment = 0;
1617 dprintk("%s\n", __func__);
1620 * Outgoing packet has a 2 byte header.
1621 * hdr[0] = slot_id, hdr[1] = connection_id
1626 /* wait for some data */
1627 status = dvb_ca_en50221_io_read_condition(ca, &result, &slot);
1629 /* if we're in nonblocking mode, exit immediately */
1630 if (file->f_flags & O_NONBLOCK)
1631 return -EWOULDBLOCK;
1633 /* wait for some data */
1634 status = wait_event_interruptible(ca->wait_queue,
1635 dvb_ca_en50221_io_read_condition
1636 (ca, &result, &slot));
1638 if ((status < 0) || (result < 0)) {
1644 sl = &ca->slot_info[slot];
1645 idx = dvb_ringbuffer_pkt_next(&sl->rx_buffer, -1, &fraglen);
1649 pr_err("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n",
1650 ca->dvbdev->adapter->num);
1655 dvb_ringbuffer_pkt_read(&sl->rx_buffer, idx, 0, hdr, 2);
1656 if (connection_id == -1)
1657 connection_id = hdr[0];
1658 if (hdr[0] == connection_id) {
1659 if (pktlen < count) {
1660 if ((pktlen + fraglen - 2) > count)
1661 fraglen = count - pktlen;
1666 dvb_ringbuffer_pkt_read_user(&sl->rx_buffer,
1676 if ((hdr[1] & 0x80) == 0)
1681 idx2 = dvb_ringbuffer_pkt_next(&sl->rx_buffer, idx, &fraglen);
1683 dvb_ringbuffer_pkt_dispose(&sl->rx_buffer, idx);
1686 } while (!last_fragment);
1689 hdr[1] = connection_id;
1690 status = copy_to_user(buf, hdr, 2);
1702 * Implementation of file open syscall.
1704 * @inode: Inode concerned.
1705 * @file: File concerned.
1707 * return: 0 on success, <0 on failure.
1709 static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file)
1711 struct dvb_device *dvbdev = file->private_data;
1712 struct dvb_ca_private *ca = dvbdev->priv;
1716 dprintk("%s\n", __func__);
1718 if (!try_module_get(ca->pub->owner))
1721 err = dvb_generic_open(inode, file);
1723 module_put(ca->pub->owner);
1727 for (i = 0; i < ca->slot_count; i++) {
1728 struct dvb_ca_slot *sl = &ca->slot_info[i];
1730 if (sl->slot_state == DVB_CA_SLOTSTATE_RUNNING) {
1731 if (!sl->rx_buffer.data) {
1733 * it is safe to call this here without locks
1734 * because ca->open == 0. Data is not read in
1737 dvb_ringbuffer_flush(&sl->rx_buffer);
1743 dvb_ca_en50221_thread_update_delay(ca);
1744 dvb_ca_en50221_thread_wakeup(ca);
1746 dvb_ca_private_get(ca);
1752 * Implementation of file close syscall.
1754 * @inode: Inode concerned.
1755 * @file: File concerned.
1757 * return: 0 on success, <0 on failure.
1759 static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file)
1761 struct dvb_device *dvbdev = file->private_data;
1762 struct dvb_ca_private *ca = dvbdev->priv;
1765 dprintk("%s\n", __func__);
1767 /* mark the CA device as closed */
1769 dvb_ca_en50221_thread_update_delay(ca);
1771 err = dvb_generic_release(inode, file);
1773 module_put(ca->pub->owner);
1775 dvb_ca_private_put(ca);
1781 * Implementation of poll() syscall.
1783 * @file: File concerned.
1784 * @wait: poll wait table.
1786 * return: Standard poll mask.
1788 static __poll_t dvb_ca_en50221_io_poll(struct file *file, poll_table *wait)
1790 struct dvb_device *dvbdev = file->private_data;
1791 struct dvb_ca_private *ca = dvbdev->priv;
1796 dprintk("%s\n", __func__);
1798 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1)
1801 /* if there is something, return now */
1805 /* wait for something to happen */
1806 poll_wait(file, &ca->wait_queue, wait);
1808 if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1)
1814 static const struct file_operations dvb_ca_fops = {
1815 .owner = THIS_MODULE,
1816 .read = dvb_ca_en50221_io_read,
1817 .write = dvb_ca_en50221_io_write,
1818 .unlocked_ioctl = dvb_ca_en50221_io_ioctl,
1819 .open = dvb_ca_en50221_io_open,
1820 .release = dvb_ca_en50221_io_release,
1821 .poll = dvb_ca_en50221_io_poll,
1822 .llseek = noop_llseek,
1825 static const struct dvb_device dvbdev_ca = {
1830 #if defined(CONFIG_MEDIA_CONTROLLER_DVB)
1831 .name = "dvb-ca-en50221",
1833 .fops = &dvb_ca_fops,
1836 /* ************************************************************************** */
1837 /* Initialisation/shutdown functions */
1840 * Initialise a new DVB CA EN50221 interface device.
1842 * @dvb_adapter: DVB adapter to attach the new CA device to.
1843 * @pubca: The dvb_ca instance.
1844 * @flags: Flags describing the CA device (DVB_CA_FLAG_*).
1845 * @slot_count: Number of slots supported.
1847 * return: 0 on success, nonzero on failure
1849 int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter,
1850 struct dvb_ca_en50221 *pubca, int flags, int slot_count)
1853 struct dvb_ca_private *ca = NULL;
1856 dprintk("%s\n", __func__);
1861 /* initialise the system data */
1862 ca = kzalloc(sizeof(*ca), GFP_KERNEL);
1867 kref_init(&ca->refcount);
1870 ca->slot_count = slot_count;
1871 ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot),
1873 if (!ca->slot_info) {
1877 init_waitqueue_head(&ca->wait_queue);
1880 ca->next_read_slot = 0;
1881 pubca->private = ca;
1883 /* register the DVB device */
1884 ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca,
1887 goto free_slot_info;
1889 /* now initialise each slot */
1890 for (i = 0; i < slot_count; i++) {
1891 struct dvb_ca_slot *sl = &ca->slot_info[i];
1893 memset(sl, 0, sizeof(struct dvb_ca_slot));
1894 sl->slot_state = DVB_CA_SLOTSTATE_NONE;
1895 atomic_set(&sl->camchange_count, 0);
1896 sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
1897 mutex_init(&sl->slot_lock);
1900 mutex_init(&ca->ioctl_mutex);
1902 if (signal_pending(current)) {
1904 goto unregister_device;
1908 /* create a kthread for monitoring this CA device */
1909 ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i",
1910 ca->dvbdev->adapter->num, ca->dvbdev->id);
1911 if (IS_ERR(ca->thread)) {
1912 ret = PTR_ERR(ca->thread);
1913 pr_err("dvb_ca_init: failed to start kernel_thread (%d)\n",
1915 goto unregister_device;
1920 dvb_unregister_device(ca->dvbdev);
1922 kfree(ca->slot_info);
1926 pubca->private = NULL;
1929 EXPORT_SYMBOL(dvb_ca_en50221_init);
1932 * Release a DVB CA EN50221 interface device.
1934 * @pubca: The associated dvb_ca instance.
1936 void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca)
1938 struct dvb_ca_private *ca = pubca->private;
1941 dprintk("%s\n", __func__);
1943 /* shutdown the thread if there was one */
1944 kthread_stop(ca->thread);
1946 for (i = 0; i < ca->slot_count; i++)
1947 dvb_ca_en50221_slot_shutdown(ca, i);
1949 dvb_remove_device(ca->dvbdev);
1950 dvb_ca_private_put(ca);
1951 pubca->private = NULL;
1953 EXPORT_SYMBOL(dvb_ca_en50221_release);