diff options
Diffstat (limited to 'drivers/media/dvb/dvb-core/dvb_ca_en50221.c')
| -rw-r--r-- | drivers/media/dvb/dvb-core/dvb_ca_en50221.c | 1724 |
1 files changed, 1724 insertions, 0 deletions
diff --git a/drivers/media/dvb/dvb-core/dvb_ca_en50221.c b/drivers/media/dvb/dvb-core/dvb_ca_en50221.c new file mode 100644 index 0000000..98ee167 --- /dev/null +++ b/drivers/media/dvb/dvb-core/dvb_ca_en50221.c @@ -0,0 +1,1724 @@ +/* + * dvb_ca.c: generic DVB functions for EN50221 CAM interfaces + * + * Copyright (C) 2004 Andrew de Quincey + * + * Parts of this file were based on sources as follows: + * + * Copyright (C) 2003 Ralph Metzler <rjkm@metzlerbros.de> + * + * based on code: + * + * Copyright (C) 1999-2002 Ralph Metzler + * & Marcus Metzler for convergence integrated media GmbH + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * Or, point your browser to http://www.gnu.org/copyleft/gpl.html + */ + +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/vmalloc.h> +#include <linux/delay.h> +#include <linux/spinlock.h> +#include <linux/sched.h> +#include <linux/kthread.h> + +#include "dvb_ca_en50221.h" +#include "dvb_ringbuffer.h" + +static int dvb_ca_en50221_debug; + +module_param_named(cam_debug, dvb_ca_en50221_debug, int, 0644); +MODULE_PARM_DESC(cam_debug, "enable verbose debug messages"); + +#define dprintk if (dvb_ca_en50221_debug) printk + +#define INIT_TIMEOUT_SECS 10 + +#define HOST_LINK_BUF_SIZE 0x200 + +#define RX_BUFFER_SIZE 65535 + +#define MAX_RX_PACKETS_PER_ITERATION 10 + +#define CTRLIF_DATA 0 +#define CTRLIF_COMMAND 1 +#define CTRLIF_STATUS 1 +#define CTRLIF_SIZE_LOW 2 +#define CTRLIF_SIZE_HIGH 3 + +#define CMDREG_HC 1 /* Host control */ +#define CMDREG_SW 2 /* Size write */ +#define CMDREG_SR 4 /* Size read */ +#define CMDREG_RS 8 /* Reset interface */ +#define CMDREG_FRIE 0x40 /* Enable FR interrupt */ +#define CMDREG_DAIE 0x80 /* Enable DA interrupt */ +#define IRQEN (CMDREG_DAIE) + +#define STATUSREG_RE 1 /* read error */ +#define STATUSREG_WE 2 /* write error */ +#define STATUSREG_FR 0x40 /* module free */ +#define STATUSREG_DA 0x80 /* data available */ +#define STATUSREG_TXERR (STATUSREG_RE|STATUSREG_WE) /* general transfer error */ + + +#define DVB_CA_SLOTSTATE_NONE 0 +#define DVB_CA_SLOTSTATE_UNINITIALISED 1 +#define DVB_CA_SLOTSTATE_RUNNING 2 +#define DVB_CA_SLOTSTATE_INVALID 3 +#define DVB_CA_SLOTSTATE_WAITREADY 4 +#define DVB_CA_SLOTSTATE_VALIDATE 5 +#define DVB_CA_SLOTSTATE_WAITFR 6 +#define DVB_CA_SLOTSTATE_LINKINIT 7 + + +/* Information on a CA slot */ +struct dvb_ca_slot { + + /* current state of the CAM */ + int slot_state; + + /* Number of CAMCHANGES that have occurred since last processing */ + atomic_t camchange_count; + + /* Type of last CAMCHANGE */ + int camchange_type; + + /* base address of CAM config */ + u32 config_base; + + /* value to write into Config Control register */ + u8 config_option; + + /* if 1, the CAM supports DA IRQs */ + u8 da_irq_supported:1; + + /* size of the buffer to use when talking to the CAM */ + int link_buf_size; + + /* buffer for incoming packets */ + struct dvb_ringbuffer rx_buffer; + + /* timer used during various states of the slot */ + unsigned long timeout; +}; + +/* Private CA-interface information */ +struct dvb_ca_private { + + /* pointer back to the public data structure */ + struct dvb_ca_en50221 *pub; + + /* the DVB device */ + struct dvb_device *dvbdev; + + /* Flags describing the interface (DVB_CA_FLAG_*) */ + u32 flags; + + /* number of slots supported by this CA interface */ + unsigned int slot_count; + + /* information on each slot */ + struct dvb_ca_slot *slot_info; + + /* wait queues for read() and write() operations */ + wait_queue_head_t wait_queue; + + /* PID of the monitoring thread */ + struct task_struct *thread; + + /* Flag indicating if the CA device is open */ + unsigned int open:1; + + /* Flag indicating the thread should wake up now */ + unsigned int wakeup:1; + + /* Delay the main thread should use */ + unsigned long delay; + + /* Slot to start looking for data to read from in the next user-space read operation */ + int next_read_slot; +}; + +static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca); +static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount); +static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount); + + +/** + * Safely find needle in haystack. + * + * @param haystack Buffer to look in. + * @param hlen Number of bytes in haystack. + * @param needle Buffer to find. + * @param nlen Number of bytes in needle. + * @return Pointer into haystack needle was found at, or NULL if not found. + */ +static char *findstr(char * haystack, int hlen, char * needle, int nlen) +{ + int i; + + if (hlen < nlen) + return NULL; + + for (i = 0; i <= hlen - nlen; i++) { + if (!strncmp(haystack + i, needle, nlen)) + return haystack + i; + } + + return NULL; +} + + + +/* ******************************************************************************** */ +/* EN50221 physical interface functions */ + + +/** + * Check CAM status. + */ +static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot) +{ + int slot_status; + int cam_present_now; + int cam_changed; + + /* IRQ mode */ + if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) { + return (atomic_read(&ca->slot_info[slot].camchange_count) != 0); + } + + /* poll mode */ + slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open); + + cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0; + cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0; + if (!cam_changed) { + int cam_present_old = (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE); + cam_changed = (cam_present_now != cam_present_old); + } + + if (cam_changed) { + if (!cam_present_now) { + ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED; + } else { + ca->slot_info[slot].camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED; + } + atomic_set(&ca->slot_info[slot].camchange_count, 1); + } else { + if ((ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) && + (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) { + // move to validate state if reset is completed + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE; + } + } + + return cam_changed; +} + + +/** + * Wait for flags to become set on the STATUS register on a CAM interface, + * checking for errors and timeout. + * + * @param ca CA instance. + * @param slot Slot on interface. + * @param waitfor Flags to wait for. + * @param timeout_ms Timeout in milliseconds. + * + * @return 0 on success, nonzero on error. + */ +static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot, + u8 waitfor, int timeout_hz) +{ + unsigned long timeout; + unsigned long start; + + dprintk("%s\n", __func__); + + /* loop until timeout elapsed */ + start = jiffies; + timeout = jiffies + timeout_hz; + while (1) { + /* read the status and check for error */ + int res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); + if (res < 0) + return -EIO; + + /* if we got the flags, it was successful! */ + if (res & waitfor) { + dprintk("%s succeeded timeout:%lu\n", __func__, jiffies - start); + return 0; + } + + /* check for timeout */ + if (time_after(jiffies, timeout)) { + break; + } + + /* wait for a bit */ + msleep(1); + } + + dprintk("%s failed timeout:%lu\n", __func__, jiffies - start); + + /* if we get here, we've timed out */ + return -ETIMEDOUT; +} + + +/** + * Initialise the link layer connection to a CAM. + * + * @param ca CA instance. + * @param slot Slot id. + * + * @return 0 on success, nonzero on failure. + */ +static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot) +{ + int ret; + int buf_size; + u8 buf[2]; + + dprintk("%s\n", __func__); + + /* we'll be determining these during this function */ + ca->slot_info[slot].da_irq_supported = 0; + + /* set the host link buffer size temporarily. it will be overwritten with the + * real negotiated size later. */ + ca->slot_info[slot].link_buf_size = 2; + + /* read the buffer size from the CAM */ + if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SR)) != 0) + return ret; + if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ / 10)) != 0) + return ret; + if ((ret = dvb_ca_en50221_read_data(ca, slot, buf, 2)) != 2) + return -EIO; + if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0) + return ret; + + /* store it, and choose the minimum of our buffer and the CAM's buffer size */ + buf_size = (buf[0] << 8) | buf[1]; + if (buf_size > HOST_LINK_BUF_SIZE) + buf_size = HOST_LINK_BUF_SIZE; + ca->slot_info[slot].link_buf_size = buf_size; + buf[0] = buf_size >> 8; + buf[1] = buf_size & 0xff; + dprintk("Chosen link buffer size of %i\n", buf_size); + + /* write the buffer size to the CAM */ + if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN | CMDREG_SW)) != 0) + return ret; + if ((ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10)) != 0) + return ret; + if ((ret = dvb_ca_en50221_write_data(ca, slot, buf, 2)) != 2) + return -EIO; + if ((ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN)) != 0) + return ret; + + /* success */ + return 0; +} + +/** + * Read a tuple from attribute memory. + * + * @param ca CA instance. + * @param slot Slot id. + * @param address Address to read from. Updated. + * @param tupleType Tuple id byte. Updated. + * @param tupleLength Tuple length. Updated. + * @param tuple Dest buffer for tuple (must be 256 bytes). Updated. + * + * @return 0 on success, nonzero on error. + */ +static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot, + int *address, int *tupleType, int *tupleLength, u8 * tuple) +{ + int i; + int _tupleType; + int _tupleLength; + int _address = *address; + + /* grab the next tuple length and type */ + if ((_tupleType = ca->pub->read_attribute_mem(ca->pub, slot, _address)) < 0) + return _tupleType; + if (_tupleType == 0xff) { + dprintk("END OF CHAIN TUPLE type:0x%x\n", _tupleType); + *address += 2; + *tupleType = _tupleType; + *tupleLength = 0; + return 0; + } + if ((_tupleLength = ca->pub->read_attribute_mem(ca->pub, slot, _address + 2)) < 0) + return _tupleLength; + _address += 4; + + dprintk("TUPLE type:0x%x length:%i\n", _tupleType, _tupleLength); + + /* read in the whole tuple */ + for (i = 0; i < _tupleLength; i++) { + tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot, _address + (i * 2)); + dprintk(" 0x%02x: 0x%02x %c\n", + i, tuple[i] & 0xff, + ((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.'); + } + _address += (_tupleLength * 2); + + // success + *tupleType = _tupleType; + *tupleLength = _tupleLength; + *address = _address; + return 0; +} + + +/** + * Parse attribute memory of a CAM module, extracting Config register, and checking + * it is a DVB CAM module. + * + * @param ca CA instance. + * @param slot Slot id. + * + * @return 0 on success, <0 on failure. + */ +static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot) +{ + int address = 0; + int tupleLength; + int tupleType; + u8 tuple[257]; + char *dvb_str; + int rasz; + int status; + int got_cftableentry = 0; + int end_chain = 0; + int i; + u16 manfid = 0; + u16 devid = 0; + + + // CISTPL_DEVICE_0A + if ((status = + dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) + return status; + if (tupleType != 0x1D) + return -EINVAL; + + + + // CISTPL_DEVICE_0C + if ((status = + dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) + return status; + if (tupleType != 0x1C) + return -EINVAL; + + + + // CISTPL_VERS_1 + if ((status = + dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, &tupleLength, tuple)) < 0) + return status; + if (tupleType != 0x15) + return -EINVAL; + + + + // CISTPL_MANFID + if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, + &tupleLength, tuple)) < 0) + return status; + if (tupleType != 0x20) + return -EINVAL; + if (tupleLength != 4) + return -EINVAL; + manfid = (tuple[1] << 8) | tuple[0]; + devid = (tuple[3] << 8) | tuple[2]; + + + + // CISTPL_CONFIG + if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, + &tupleLength, tuple)) < 0) + return status; + if (tupleType != 0x1A) + return -EINVAL; + if (tupleLength < 3) + return -EINVAL; + + /* extract the configbase */ + rasz = tuple[0] & 3; + if (tupleLength < (3 + rasz + 14)) + return -EINVAL; + ca->slot_info[slot].config_base = 0; + for (i = 0; i < rasz + 1; i++) { + ca->slot_info[slot].config_base |= (tuple[2 + i] << (8 * i)); + } + + /* check it contains the correct DVB string */ + dvb_str = findstr((char *)tuple, tupleLength, "DVB_CI_V", 8); + if (dvb_str == NULL) + return -EINVAL; + if (tupleLength < ((dvb_str - (char *) tuple) + 12)) + return -EINVAL; + + /* is it a version we support? */ + if (strncmp(dvb_str + 8, "1.00", 4)) { + printk("dvb_ca adapter %d: Unsupported DVB CAM module version %c%c%c%c\n", + ca->dvbdev->adapter->num, dvb_str[8], dvb_str[9], dvb_str[10], dvb_str[11]); + return -EINVAL; + } + + /* process the CFTABLE_ENTRY tuples, and any after those */ + while ((!end_chain) && (address < 0x1000)) { + if ((status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tupleType, + &tupleLength, tuple)) < 0) + return status; + switch (tupleType) { + case 0x1B: // CISTPL_CFTABLE_ENTRY + if (tupleLength < (2 + 11 + 17)) + break; + + /* if we've already parsed one, just use it */ + if (got_cftableentry) + break; + + /* get the config option */ + ca->slot_info[slot].config_option = tuple[0] & 0x3f; + + /* OK, check it contains the correct strings */ + if ((findstr((char *)tuple, tupleLength, "DVB_HOST", 8) == NULL) || + (findstr((char *)tuple, tupleLength, "DVB_CI_MODULE", 13) == NULL)) + break; + + got_cftableentry = 1; + break; + + case 0x14: // CISTPL_NO_LINK + break; + + case 0xFF: // CISTPL_END + end_chain = 1; + break; + + default: /* Unknown tuple type - just skip this tuple and move to the next one */ + dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n", tupleType, + tupleLength); + break; + } + } + + if ((address > 0x1000) || (!got_cftableentry)) + return -EINVAL; + + dprintk("Valid DVB CAM detected MANID:%x DEVID:%x CONFIGBASE:0x%x CONFIGOPTION:0x%x\n", + manfid, devid, ca->slot_info[slot].config_base, ca->slot_info[slot].config_option); + + // success! + return 0; +} + + +/** + * Set CAM's configoption correctly. + * + * @param ca CA instance. + * @param slot Slot containing the CAM. + */ +static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot) +{ + int configoption; + + dprintk("%s\n", __func__); + + /* set the config option */ + ca->pub->write_attribute_mem(ca->pub, slot, + ca->slot_info[slot].config_base, + ca->slot_info[slot].config_option); + + /* check it */ + configoption = ca->pub->read_attribute_mem(ca->pub, slot, ca->slot_info[slot].config_base); + dprintk("Set configoption 0x%x, read configoption 0x%x\n", + ca->slot_info[slot].config_option, configoption & 0x3f); + + /* fine! */ + return 0; + +} + + +/** + * This function talks to an EN50221 CAM control interface. It reads a buffer of + * data from the CAM. The data can either be stored in a supplied buffer, or + * automatically be added to the slot's rx_buffer. + * + * @param ca CA instance. + * @param slot Slot to read from. + * @param ebuf If non-NULL, the data will be written to this buffer. If NULL, + * the data will be added into the buffering system as a normal fragment. + * @param ecount Size of ebuf. Ignored if ebuf is NULL. + * + * @return Number of bytes read, or < 0 on error + */ +static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot, u8 * ebuf, int ecount) +{ + int bytes_read; + int status; + u8 buf[HOST_LINK_BUF_SIZE]; + int i; + + dprintk("%s\n", __func__); + + /* check if we have space for a link buf in the rx_buffer */ + if (ebuf == NULL) { + int buf_free; + + if (ca->slot_info[slot].rx_buffer.data == NULL) { + status = -EIO; + goto exit; + } + buf_free = dvb_ringbuffer_free(&ca->slot_info[slot].rx_buffer); + + if (buf_free < (ca->slot_info[slot].link_buf_size + DVB_RINGBUFFER_PKTHDRSIZE)) { + status = -EAGAIN; + goto exit; + } + } + + /* check if there is data available */ + if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) + goto exit; + if (!(status & STATUSREG_DA)) { + /* no data */ + status = 0; + goto exit; + } + + /* read the amount of data */ + if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH)) < 0) + goto exit; + bytes_read = status << 8; + if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW)) < 0) + goto exit; + bytes_read |= status; + + /* check it will fit */ + if (ebuf == NULL) { + if (bytes_read > ca->slot_info[slot].link_buf_size) { + printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the link buffer size (%i > %i)!\n", + ca->dvbdev->adapter->num, bytes_read, ca->slot_info[slot].link_buf_size); + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; + status = -EIO; + goto exit; + } + if (bytes_read < 2) { + printk("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n", + ca->dvbdev->adapter->num); + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; + status = -EIO; + goto exit; + } + } else { + if (bytes_read > ecount) { + printk("dvb_ca adapter %d: CAM tried to send a buffer larger than the ecount size!\n", + ca->dvbdev->adapter->num); + status = -EIO; + goto exit; + } + } + + /* fill the buffer */ + for (i = 0; i < bytes_read; i++) { + /* read byte and check */ + if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_DATA)) < 0) + goto exit; + + /* OK, store it in the buffer */ + buf[i] = status; + } + + /* check for read error (RE should now be 0) */ + if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) + goto exit; + if (status & STATUSREG_RE) { + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; + status = -EIO; + goto exit; + } + + /* OK, add it to the receive buffer, or copy into external buffer if supplied */ + if (ebuf == NULL) { + if (ca->slot_info[slot].rx_buffer.data == NULL) { + status = -EIO; + goto exit; + } + dvb_ringbuffer_pkt_write(&ca->slot_info[slot].rx_buffer, buf, bytes_read); + } else { + memcpy(ebuf, buf, bytes_read); + } + + dprintk("Received CA packet for slot %i connection id 0x%x last_frag:%i size:0x%x\n", slot, + buf[0], (buf[1] & 0x80) == 0, bytes_read); + + /* wake up readers when a last_fragment is received */ + if ((buf[1] & 0x80) == 0x00) { + wake_up_interruptible(&ca->wait_queue); + } + status = bytes_read; + +exit: + return status; +} + + +/** + * This function talks to an EN50221 CAM control interface. It writes a buffer of data + * to a CAM. + * + * @param ca CA instance. + * @param slot Slot to write to. + * @param ebuf The data in this buffer is treated as a complete link-level packet to + * be written. + * @param count Size of ebuf. + * + * @return Number of bytes written, or < 0 on error. + */ +static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot, u8 * buf, int bytes_write) +{ + int status; + int i; + + dprintk("%s\n", __func__); + + + // sanity check + if (bytes_write > ca->slot_info[slot].link_buf_size) + return -EINVAL; + + /* check if interface is actually waiting for us to read from it, or if a read is in progress */ + if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) + goto exitnowrite; + if (status & (STATUSREG_DA | STATUSREG_RE)) { + status = -EAGAIN; + goto exitnowrite; + } + + /* OK, set HC bit */ + if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, + IRQEN | CMDREG_HC)) != 0) + goto exit; + + /* check if interface is still free */ + if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) + goto exit; + if (!(status & STATUSREG_FR)) { + /* it wasn't free => try again later */ + status = -EAGAIN; + goto exit; + } + + /* send the amount of data */ + if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, bytes_write >> 8)) != 0) + goto exit; + if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW, + bytes_write & 0xff)) != 0) + goto exit; + + /* send the buffer */ + for (i = 0; i < bytes_write; i++) { + if ((status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, buf[i])) != 0) + goto exit; + } + + /* check for write error (WE should now be 0) */ + if ((status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS)) < 0) + goto exit; + if (status & STATUSREG_WE) { + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; + status = -EIO; + goto exit; + } + status = bytes_write; + + dprintk("Wrote CA packet for slot %i, connection id 0x%x last_frag:%i size:0x%x\n", slot, + buf[0], (buf[1] & 0x80) == 0, bytes_write); + +exit: + ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN); + +exitnowrite: + return status; +} +EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq); + + + +/* ******************************************************************************** */ +/* EN50221 higher level functions */ + + +/** + * A CAM has been removed => shut it down. + * + * @param ca CA instance. + * @param slot Slot to shut down. + */ +static int dvb_ca_en50221_slot_shutdown(struct dvb_ca_private *ca, int slot) +{ + dprintk("%s\n", __func__); + + ca->pub->slot_shutdown(ca->pub, slot); + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; + + /* need to wake up all processes to check if they're now + trying to write to a defunct CAM */ + wake_up_interruptible(&ca->wait_queue); + + dprintk("Slot %i shutdown\n", slot); + + /* success */ + return 0; +} +EXPORT_SYMBOL(dvb_ca_en50221_camready_irq); + + +/** + * A CAMCHANGE IRQ has occurred. + * + * @param ca CA instance. + * @param slot Slot concerned. + * @param change_type One of the DVB_CA_CAMCHANGE_* values. + */ +void dvb_ca_en50221_camchange_irq(struct dvb_ca_en50221 *pubca, int slot, int change_type) +{ + struct dvb_ca_private *ca = pubca->private; + + dprintk("CAMCHANGE IRQ slot:%i change_type:%i\n", slot, change_type); + + switch (change_type) { + case DVB_CA_EN50221_CAMCHANGE_REMOVED: + case DVB_CA_EN50221_CAMCHANGE_INSERTED: + break; + + default: + return; + } + + ca->slot_info[slot].camchange_type = change_type; + atomic_inc(&ca->slot_info[slot].camchange_count); + dvb_ca_en50221_thread_wakeup(ca); +} +EXPORT_SYMBOL(dvb_ca_en50221_frda_irq); + + +/** + * A CAMREADY IRQ has occurred. + * + * @param ca CA instance. + * @param slot Slot concerned. + */ +void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot) +{ + struct dvb_ca_private *ca = pubca->private; + + dprintk("CAMREADY IRQ slot:%i\n", slot); + + if (ca->slot_info[slot].slot_state == DVB_CA_SLOTSTATE_WAITREADY) { + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_VALIDATE; + dvb_ca_en50221_thread_wakeup(ca); + } +} + + +/** + * An FR or DA IRQ has occurred. + * + * @param ca CA instance. + * @param slot Slot concerned. + */ +void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot) +{ + struct dvb_ca_private *ca = pubca->private; + int flags; + + dprintk("FR/DA IRQ slot:%i\n", slot); + + switch (ca->slot_info[slot].slot_state) { + case DVB_CA_SLOTSTATE_LINKINIT: + flags = ca->pub->read_cam_control(pubca, slot, CTRLIF_STATUS); + if (flags & STATUSREG_DA) { + dprintk("CAM supports DA IRQ\n"); + ca->slot_info[slot].da_irq_supported = 1; + } + break; + + case DVB_CA_SLOTSTATE_RUNNING: + if (ca->open) + dvb_ca_en50221_thread_wakeup(ca); + break; + } +} + + + +/* ******************************************************************************** */ +/* EN50221 thread functions */ + +/** + * Wake up the DVB CA thread + * + * @param ca CA instance. + */ +static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca) +{ + + dprintk("%s\n", __func__); + + ca->wakeup = 1; + mb(); + wake_up_process(ca->thread); +} + +/** + * Update the delay used by the thread. + * + * @param ca CA instance. + */ +static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca) +{ + int delay; + int curdelay = 100000000; + int slot; + + /* Beware of too high polling frequency, because one polling + * call might take several hundred milliseconds until timeout! + */ + for (slot = 0; slot < ca->slot_count; slot++) { + switch (ca->slot_info[slot].slot_state) { + default: + case DVB_CA_SLOTSTATE_NONE: + delay = HZ * 60; /* 60s */ + if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) + delay = HZ * 5; /* 5s */ + break; + case DVB_CA_SLOTSTATE_INVALID: + delay = HZ * 60; /* 60s */ + if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) + delay = HZ / 10; /* 100ms */ + break; + + case DVB_CA_SLOTSTATE_UNINITIALISED: + case DVB_CA_SLOTSTATE_WAITREADY: + case DVB_CA_SLOTSTATE_VALIDATE: + case DVB_CA_SLOTSTATE_WAITFR: + case DVB_CA_SLOTSTATE_LINKINIT: + delay = HZ / 10; /* 100ms */ + break; + + case DVB_CA_SLOTSTATE_RUNNING: + delay = HZ * 60; /* 60s */ + if (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) + delay = HZ / 10; /* 100ms */ + if (ca->open) { + if ((!ca->slot_info[slot].da_irq_supported) || + (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA))) + delay = HZ / 10; /* 100ms */ + } + break; + } + + if (delay < curdelay) + curdelay = delay; + } + + ca->delay = curdelay; +} + + + +/** + * Kernel thread which monitors CA slots for CAM changes, and performs data transfers. + */ +static int dvb_ca_en50221_thread(void *data) +{ + struct dvb_ca_private *ca = data; + int slot; + int flags; + int status; + int pktcount; + void *rxbuf; + + dprintk("%s\n", __func__); + + /* choose the correct initial delay */ + dvb_ca_en50221_thread_update_delay(ca); + + /* main loop */ + while (!kthread_should_stop()) { + /* sleep for a bit */ + if (!ca->wakeup) { + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout(ca->delay); + if (kthread_should_stop()) + return 0; + } + ca->wakeup = 0; + + /* go through all the slots processing them */ + for (slot = 0; slot < ca->slot_count; slot++) { + + // check the cam status + deal with CAMCHANGEs + while (dvb_ca_en50221_check_camstatus(ca, slot)) { + /* clear down an old CI slot if necessary */ + if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) + dvb_ca_en50221_slot_shutdown(ca, slot); + + /* if a CAM is NOW present, initialise it */ + if (ca->slot_info[slot].camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) { + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_UNINITIALISED; + } + + /* we've handled one CAMCHANGE */ + dvb_ca_en50221_thread_update_delay(ca); + atomic_dec(&ca->slot_info[slot].camchange_count); + } + + // CAM state machine + switch (ca->slot_info[slot].slot_state) { + case DVB_CA_SLOTSTATE_NONE: + case DVB_CA_SLOTSTATE_INVALID: + // no action needed + break; + + case DVB_CA_SLOTSTATE_UNINITIALISED: + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITREADY; + ca->pub->slot_reset(ca->pub, slot); + ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ); + break; + + case DVB_CA_SLOTSTATE_WAITREADY: + if (time_after(jiffies, ca->slot_info[slot].timeout)) { + printk("dvb_ca adaptor %d: PC card did not respond :(\n", + ca->dvbdev->adapter->num); + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; + dvb_ca_en50221_thread_update_delay(ca); + break; + } + // no other action needed; will automatically change state when ready + break; + + case DVB_CA_SLOTSTATE_VALIDATE: + if (dvb_ca_en50221_parse_attributes(ca, slot) != 0) { + /* we need this extra check for annoying interfaces like the budget-av */ + if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) && + (ca->pub->poll_slot_status)) { + status = ca->pub->poll_slot_status(ca->pub, slot, 0); + if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) { + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; + dvb_ca_en50221_thread_update_delay(ca); + break; + } + } + + printk("dvb_ca adapter %d: Invalid PC card inserted :(\n", + ca->dvbdev->adapter->num); + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; + dvb_ca_en50221_thread_update_delay(ca); + break; + } + if (dvb_ca_en50221_set_configoption(ca, slot) != 0) { + printk("dvb_ca adapter %d: Unable to initialise CAM :(\n", + ca->dvbdev->adapter->num); + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; + dvb_ca_en50221_thread_update_delay(ca); + break; + } + if (ca->pub->write_cam_control(ca->pub, slot, + CTRLIF_COMMAND, CMDREG_RS) != 0) { + printk("dvb_ca adapter %d: Unable to reset CAM IF\n", + ca->dvbdev->adapter->num); + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; + dvb_ca_en50221_thread_update_delay(ca); + break; + } + dprintk("DVB CAM validated successfully\n"); + + ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ); + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITFR; + ca->wakeup = 1; + break; + + case DVB_CA_SLOTSTATE_WAITFR: + if (time_after(jiffies, ca->slot_info[slot].timeout)) { + printk("dvb_ca adapter %d: DVB CAM did not respond :(\n", + ca->dvbdev->adapter->num); + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; + dvb_ca_en50221_thread_update_delay(ca); + break; + } + + flags = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); + if (flags & STATUSREG_FR) { + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT; + ca->wakeup = 1; + } + break; + + case DVB_CA_SLOTSTATE_LINKINIT: + if (dvb_ca_en50221_link_init(ca, slot) != 0) { + /* we need this extra check for annoying interfaces like the budget-av */ + if ((!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)) && + (ca->pub->poll_slot_status)) { + status = ca->pub->poll_slot_status(ca->pub, slot, 0); + if (!(status & DVB_CA_EN50221_POLL_CAM_PRESENT)) { + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_NONE; + dvb_ca_en50221_thread_update_delay(ca); + break; + } + } + + printk("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n", ca->dvbdev->adapter->num); + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; + dvb_ca_en50221_thread_update_delay(ca); + break; + } + + if (ca->slot_info[slot].rx_buffer.data == NULL) { + rxbuf = vmalloc(RX_BUFFER_SIZE); + if (rxbuf == NULL) { + printk("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n", ca->dvbdev->adapter->num); + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID; + dvb_ca_en50221_thread_update_delay(ca); + break; + } + dvb_ringbuffer_init(&ca->slot_info[slot].rx_buffer, rxbuf, RX_BUFFER_SIZE); + } + + ca->pub->slot_ts_enable(ca->pub, slot); + ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_RUNNING; + dvb_ca_en50221_thread_update_delay(ca); + printk("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n", ca->dvbdev->adapter->num); + break; + + case DVB_CA_SLOTSTATE_RUNNING: + if (!ca->open) + continue; + + // poll slots for data + pktcount = 0; + while ((status = dvb_ca_en50221_read_data(ca, slot, NULL, 0)) > 0) { + if (!ca->open) + break; + + /* if a CAMCHANGE occurred at some point, do not do any more processing of this slot */ + if (dvb_ca_en50221_check_camstatus(ca, slot)) { + // we dont want to sleep on the next iteration so we can handle the cam change + ca->wakeup = 1; + break; + } + + /* check if we've hit our limit this time */ + if (++pktcount >= MAX_RX_PACKETS_PER_ITERATION) { + // dont sleep; there is likely to be more data to read + ca->wakeup = 1; + break; + } + } + break; + } + } + } + + return 0; +} + + + +/* ******************************************************************************** */ +/* EN50221 IO interface functions */ + +/** + * Real ioctl implementation. + * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them. + * + * @param inode Inode concerned. + * @param file File concerned. + * @param cmd IOCTL command. + * @param arg Associated argument. + * + * @return 0 on success, <0 on error. + */ +static int dvb_ca_en50221_io_do_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, void *parg) +{ + struct dvb_device *dvbdev = file->private_data; + struct dvb_ca_private *ca = dvbdev->priv; + int err = 0; + int slot; + + dprintk("%s\n", __func__); + + switch (cmd) { + case CA_RESET: + for (slot = 0; slot < ca->slot_count; slot++) { + if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE) { + dvb_ca_en50221_slot_shutdown(ca, slot); + if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE) + dvb_ca_en50221_camchange_irq(ca->pub, + slot, + DVB_CA_EN50221_CAMCHANGE_INSERTED); + } + } + ca->next_read_slot = 0; + dvb_ca_en50221_thread_wakeup(ca); + break; + + case CA_GET_CAP: { + struct ca_caps *caps = parg; + + caps->slot_num = ca->slot_count; + caps->slot_type = CA_CI_LINK; + caps->descr_num = 0; + caps->descr_type = 0; + break; + } + + case CA_GET_SLOT_INFO: { + struct ca_slot_info *info = parg; + + if ((info->num > ca->slot_count) || (info->num < 0)) + return -EINVAL; + + info->type = CA_CI_LINK; + info->flags = 0; + if ((ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_NONE) + && (ca->slot_info[info->num].slot_state != DVB_CA_SLOTSTATE_INVALID)) { + info->flags = CA_CI_MODULE_PRESENT; + } + if (ca->slot_info[info->num].slot_state == DVB_CA_SLOTSTATE_RUNNING) { + info->flags |= CA_CI_MODULE_READY; + } + break; + } + + default: + err = -EINVAL; + break; + } + + return err; +} + + +/** + * Wrapper for ioctl implementation. + * + * @param inode Inode concerned. + * @param file File concerned. + * @param cmd IOCTL command. + * @param arg Associated argument. + * + * @return 0 on success, <0 on error. + */ +static int dvb_ca_en50221_io_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + return dvb_usercopy(inode, file, cmd, arg, dvb_ca_en50221_io_do_ioctl); +} + + +/** + * Implementation of write() syscall. + * + * @param file File structure. + * @param buf Source buffer. + * @param count Size of source buffer. + * @param ppos Position in file (ignored). + * + * @return Number of bytes read, or <0 on error. + */ +static ssize_t dvb_ca_en50221_io_write(struct file *file, + const char __user * buf, size_t count, loff_t * ppos) +{ + struct dvb_device *dvbdev = file->private_data; + struct dvb_ca_private *ca = dvbdev->priv; + u8 slot, connection_id; + int status; + u8 fragbuf[HOST_LINK_BUF_SIZE]; + int fragpos = 0; + int fraglen; + unsigned long timeout; + int written; + + dprintk("%s\n", __func__); + + /* Incoming packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */ + if (count < 2) + return -EINVAL; + + /* extract slot & connection id */ + if (copy_from_user(&slot, buf, 1)) + return -EFAULT; + if (copy_from_user(&connection_id, buf + 1, 1)) + return -EFAULT; + buf += 2; + count -= 2; + + /* check if the slot is actually running */ + if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) + return -EINVAL; + + /* fragment the packets & store in the buffer */ + while (fragpos < count) { + fraglen = ca->slot_info[slot].link_buf_size - 2; + if ((count - fragpos) < fraglen) + fraglen = count - fragpos; + + fragbuf[0] = connection_id; + fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00; + if ((status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen)) != 0) + goto exit; + + timeout = jiffies + HZ / 2; + written = 0; + while (!time_after(jiffies, timeout)) { + /* check the CAM hasn't been removed/reset in the meantime */ + if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) { + status = -EIO; + goto exit; + } + + status = dvb_ca_en50221_write_data(ca, slot, fragbuf, fraglen + 2); + if (status == (fraglen + 2)) { + written = 1; + break; + } + if (status != -EAGAIN) + goto exit; + + msleep(1); + } + if (!written) { + status = -EIO; + goto exit; + } + + fragpos += fraglen; + } + status = count + 2; + +exit: + return status; +} + + +/** + * Condition for waking up in dvb_ca_en50221_io_read_condition + */ +static int dvb_ca_en50221_io_read_condition(struct dvb_ca_private *ca, + int *result, int *_slot) +{ + int slot; + int slot_count = 0; + int idx; + size_t fraglen; + int connection_id = -1; + int found = 0; + u8 hdr[2]; + + slot = ca->next_read_slot; + while ((slot_count < ca->slot_count) && (!found)) { + if (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_RUNNING) + goto nextslot; + + if (ca->slot_info[slot].rx_buffer.data == NULL) { + return 0; + } + + idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen); + while (idx != -1) { + dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2); + if (connection_id == -1) + connection_id = hdr[0]; + if ((hdr[0] == connection_id) && ((hdr[1] & 0x80) == 0)) { + *_slot = slot; + found = 1; + break; + } + + idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen); + } + +nextslot: + slot = (slot + 1) % ca->slot_count; + slot_count++; + } + + ca->next_read_slot = slot; + return found; +} + + +/** + * Implementation of read() syscall. + * + * @param file File structure. + * @param buf Destination buffer. + * @param count Size of destination buffer. + * @param ppos Position in file (ignored). + * + * @return Number of bytes read, or <0 on error. + */ +static ssize_t dvb_ca_en50221_io_read(struct file *file, char __user * buf, + size_t count, loff_t * ppos) +{ + struct dvb_device *dvbdev = file->private_data; + struct dvb_ca_private *ca = dvbdev->priv; + int status; + int result = 0; + u8 hdr[2]; + int slot; + int connection_id = -1; + size_t idx, idx2; + int last_fragment = 0; + size_t fraglen; + int pktlen; + int dispose = 0; + + dprintk("%s\n", __func__); + + /* Outgoing packet has a 2 byte header. hdr[0] = slot_id, hdr[1] = connection_id */ + if (count < 2) + return -EINVAL; + + /* wait for some data */ + if ((status = dvb_ca_en50221_io_read_condition(ca, &result, &slot)) == 0) { + + /* if we're in nonblocking mode, exit immediately */ + if (file->f_flags & O_NONBLOCK) + return -EWOULDBLOCK; + + /* wait for some data */ + status = wait_event_interruptible(ca->wait_queue, + dvb_ca_en50221_io_read_condition + (ca, &result, &slot)); + } + if ((status < 0) || (result < 0)) { + if (result) + return result; + return status; + } + + idx = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, -1, &fraglen); + pktlen = 2; + do { + if (idx == -1) { + printk("dvb_ca adapter %d: BUG: read packet ended before last_fragment encountered\n", ca->dvbdev->adapter->num); + status = -EIO; + goto exit; + } + + dvb_ringbuffer_pkt_read(&ca->slot_info[slot].rx_buffer, idx, 0, hdr, 2); + if (connection_id == -1) + connection_id = hdr[0]; + if (hdr[0] == connection_id) { + if (pktlen < count) { + if ((pktlen + fraglen - 2) > count) { + fraglen = count - pktlen; + } else { + fraglen -= 2; + } + + if ((status = dvb_ringbuffer_pkt_read_user(&ca->slot_info[slot].rx_buffer, idx, 2, + buf + pktlen, fraglen)) < 0) { + goto exit; + } + pktlen += fraglen; + } + + if ((hdr[1] & 0x80) == 0) + last_fragment = 1; + dispose = 1; + } + + idx2 = dvb_ringbuffer_pkt_next(&ca->slot_info[slot].rx_buffer, idx, &fraglen); + if (dispose) + dvb_ringbuffer_pkt_dispose(&ca->slot_info[slot].rx_buffer, idx); + idx = idx2; + dispose = 0; + } while (!last_fragment); + + hdr[0] = slot; + hdr[1] = connection_id; + if ((status = copy_to_user(buf, hdr, 2)) != 0) + goto exit; + status = pktlen; + +exit: + return status; +} + + +/** + * Implementation of file open syscall. + * + * @param inode Inode concerned. + * @param file File concerned. + * + * @return 0 on success, <0 on failure. + */ +static int dvb_ca_en50221_io_open(struct inode *inode, struct file *file) +{ + struct dvb_device *dvbdev = file->private_data; + struct dvb_ca_private *ca = dvbdev->priv; + int err; + int i; + + dprintk("%s\n", __func__); + + if (!try_module_get(ca->pub->owner)) + return -EIO; + + err = dvb_generic_open(inode, file); + if (err < 0) { + module_put(ca->pub->owner); + return err; + } + + for (i = 0; i < ca->slot_count; i++) { + + if (ca->slot_info[i].slot_state == DVB_CA_SLOTSTATE_RUNNING) { + if (ca->slot_info[i].rx_buffer.data != NULL) { + /* it is safe to call this here without locks because + * ca->open == 0. Data is not read in this case */ + dvb_ringbuffer_flush(&ca->slot_info[i].rx_buffer); + } + } + } + + ca->open = 1; + dvb_ca_en50221_thread_update_delay(ca); + dvb_ca_en50221_thread_wakeup(ca); + + return 0; +} + + +/** + * Implementation of file close syscall. + * + * @param inode Inode concerned. + * @param file File concerned. + * + * @return 0 on success, <0 on failure. + */ +static int dvb_ca_en50221_io_release(struct inode *inode, struct file *file) +{ + struct dvb_device *dvbdev = file->private_data; + struct dvb_ca_private *ca = dvbdev->priv; + int err; + + dprintk("%s\n", __func__); + + /* mark the CA device as closed */ + ca->open = 0; + dvb_ca_en50221_thread_update_delay(ca); + + err = dvb_generic_release(inode, file); + + module_put(ca->pub->owner); + + return err; +} + + +/** + * Implementation of poll() syscall. + * + * @param file File concerned. + * @param wait poll wait table. + * + * @return Standard poll mask. + */ +static unsigned int dvb_ca_en50221_io_poll(struct file *file, poll_table * wait) +{ + struct dvb_device *dvbdev = file->private_data; + struct dvb_ca_private *ca = dvbdev->priv; + unsigned int mask = 0; + int slot; + int result = 0; + + dprintk("%s\n", __func__); + + if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) { + mask |= POLLIN; + } + + /* if there is something, return now */ + if (mask) + return mask; + + /* wait for something to happen */ + poll_wait(file, &ca->wait_queue, wait); + + if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) { + mask |= POLLIN; + } + + return mask; +} +EXPORT_SYMBOL(dvb_ca_en50221_init); + + +static struct file_operations dvb_ca_fops = { + .owner = THIS_MODULE, + .read = dvb_ca_en50221_io_read, + .write = dvb_ca_en50221_io_write, + .ioctl = dvb_ca_en50221_io_ioctl, + .open = dvb_ca_en50221_io_open, + .release = dvb_ca_en50221_io_release, + .poll = dvb_ca_en50221_io_poll, +}; + +static struct dvb_device dvbdev_ca = { + .priv = NULL, + .users = 1, + .readers = 1, + .writers = 1, + .fops = &dvb_ca_fops, +}; + + +/* ******************************************************************************** */ +/* Initialisation/shutdown functions */ + + +/** + * Initialise a new DVB CA EN50221 interface device. + * + * @param dvb_adapter DVB adapter to attach the new CA device to. + * @param ca The dvb_ca instance. + * @param flags Flags describing the CA device (DVB_CA_FLAG_*). + * @param slot_count Number of slots supported. + * + * @return 0 on success, nonzero on failure + */ +int dvb_ca_en50221_init(struct dvb_adapter *dvb_adapter, + struct dvb_ca_en50221 *pubca, int flags, int slot_count) +{ + int ret; + struct dvb_ca_private *ca = NULL; + int i; + + dprintk("%s\n", __func__); + + if (slot_count < 1) + return -EINVAL; + + /* initialise the system data */ + if ((ca = kzalloc(sizeof(struct dvb_ca_private), GFP_KERNEL)) == NULL) { + ret = -ENOMEM; + goto error; + } + ca->pub = pubca; + ca->flags = flags; + ca->slot_count = slot_count; + if ((ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot), GFP_KERNEL)) == NULL) { + ret = -ENOMEM; + goto error; + } + init_waitqueue_head(&ca->wait_queue); + ca->open = 0; + ca->wakeup = 0; + ca->next_read_slot = 0; + pubca->private = ca; + + /* register the DVB device */ + ret = dvb_register_device(dvb_adapter, &ca->dvbdev, &dvbdev_ca, ca, DVB_DEVICE_CA); + if (ret) + goto error; + + /* now initialise each slot */ + for (i = 0; i < slot_count; i++) { + memset(&ca->slot_info[i], 0, sizeof(struct dvb_ca_slot)); + ca->slot_info[i].slot_state = DVB_CA_SLOTSTATE_NONE; + atomic_set(&ca->slot_info[i].camchange_count, 0); + ca->slot_info[i].camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED; + } + + if (signal_pending(current)) { + ret = -EINTR; + goto error; + } + mb(); + + /* create a kthread for monitoring this CA device */ + ca->thread = kthread_run(dvb_ca_en50221_thread, ca, "kdvb-ca-%i:%i", + ca->dvbdev->adapter->num, ca->dvbdev->id); + if (IS_ERR(ca->thread)) { + ret = PTR_ERR(ca->thread); + printk("dvb_ca_init: failed to start kernel_thread (%d)\n", + ret); + goto error; + } + return 0; + +error: + if (ca != NULL) { + if (ca->dvbdev != NULL) + dvb_unregister_device(ca->dvbdev); + kfree(ca->slot_info); + kfree(ca); + } + pubca->private = NULL; + return ret; +} +EXPORT_SYMBOL(dvb_ca_en50221_release); + + + +/** + * Release a DVB CA EN50221 interface device. + * + * @param ca_dev The dvb_device_t instance for the CA device. + * @param ca The associated dvb_ca instance. + */ +void dvb_ca_en50221_release(struct dvb_ca_en50221 *pubca) +{ + struct dvb_ca_private *ca = pubca->private; + int i; + + dprintk("%s\n", __func__); + + /* shutdown the thread if there was one */ + kthread_stop(ca->thread); + + for (i = 0; i < ca->slot_count; i++) { + dvb_ca_en50221_slot_shutdown(ca, i); + vfree(ca->slot_info[i].rx_buffer.data); + } + kfree(ca->slot_info); + dvb_unregister_device(ca->dvbdev); + kfree(ca); + pubca->private = NULL; +} |
