diff options
Diffstat (limited to 'drivers/media/dvb-core/dvb_ca_en50221.c')
| -rw-r--r-- | drivers/media/dvb-core/dvb_ca_en50221.c | 1946 |
1 files changed, 1946 insertions, 0 deletions
diff --git a/drivers/media/dvb-core/dvb_ca_en50221.c b/drivers/media/dvb-core/dvb_ca_en50221.c new file mode 100644 index 000000000..c2d279222 --- /dev/null +++ b/drivers/media/dvb-core/dvb_ca_en50221.c @@ -0,0 +1,1946 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * 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 + */ + +#define pr_fmt(fmt) "dvb_ca_en50221: " fmt + +#include <linux/errno.h> +#include <linux/slab.h> +#include <linux/list.h> +#include <linux/module.h> +#include <linux/nospec.h> +#include <linux/vmalloc.h> +#include <linux/delay.h> +#include <linux/spinlock.h> +#include <linux/sched/signal.h> +#include <linux/kthread.h> + +#include <media/dvb_ca_en50221.h> +#include <media/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(fmt, arg...) do { \ + if (dvb_ca_en50221_debug) \ + printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg);\ +} while (0) + +#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 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; + + /* mutex used for serializing access to one CI slot */ + struct mutex slot_lock; + + /* 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 { + struct kref refcount; + + /* 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; + + /* mutex serializing ioctls */ + struct mutex ioctl_mutex; +}; + +static void dvb_ca_private_free(struct dvb_ca_private *ca) +{ + unsigned int i; + + dvb_device_put(ca->dvbdev); + for (i = 0; i < ca->slot_count; i++) + vfree(ca->slot_info[i].rx_buffer.data); + + kfree(ca->slot_info); + kfree(ca); +} + +static void dvb_ca_private_release(struct kref *ref) +{ + struct dvb_ca_private *ca; + + ca = container_of(ref, struct dvb_ca_private, refcount); + dvb_ca_private_free(ca); +} + +static void dvb_ca_private_get(struct dvb_ca_private *ca) +{ + kref_get(&ca->refcount); +} + +static void dvb_ca_private_put(struct dvb_ca_private *ca) +{ + kref_put(&ca->refcount, dvb_ca_private_release); +} + +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); + +/** + * findstr - Safely find needle in haystack. + * + * @haystack: Buffer to look in. + * @hlen: Number of bytes in haystack. + * @needle: Buffer to find. + * @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 */ + +/* + * dvb_ca_en50221_check_camstatus - Check CAM status. + */ +static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot) +{ + struct dvb_ca_slot *sl = &ca->slot_info[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(&sl->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 = (sl->slot_state != DVB_CA_SLOTSTATE_NONE); + + cam_changed = (cam_present_now != cam_present_old); + } + + if (cam_changed) { + if (!cam_present_now) + sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED; + else + sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED; + atomic_set(&sl->camchange_count, 1); + } else { + if ((sl->slot_state == DVB_CA_SLOTSTATE_WAITREADY) && + (slot_status & DVB_CA_EN50221_POLL_CAM_READY)) { + /* move to validate state if reset is completed */ + sl->slot_state = DVB_CA_SLOTSTATE_VALIDATE; + } + } + + return cam_changed; +} + +/** + * dvb_ca_en50221_wait_if_status - Wait for flags to become set on the STATUS + * register on a CAM interface, checking for errors and timeout. + * + * @ca: CA instance. + * @slot: Slot on interface. + * @waitfor: Flags to wait for. + * @timeout_hz: 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) { + int res; + + /* read the status and check for error */ + 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 */ + usleep_range(1000, 1100); + } + + dprintk("%s failed timeout:%lu\n", __func__, jiffies - start); + + /* if we get here, we've timed out */ + return -ETIMEDOUT; +} + +/** + * dvb_ca_en50221_link_init - Initialise the link layer connection to a CAM. + * + * @ca: CA instance. + * @slot: Slot id. + * + * return: 0 on success, nonzero on failure. + */ +static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot) +{ + struct dvb_ca_slot *sl = &ca->slot_info[slot]; + int ret; + int buf_size; + u8 buf[2]; + + dprintk("%s\n", __func__); + + /* we'll be determining these during this function */ + sl->da_irq_supported = 0; + + /* + * set the host link buffer size temporarily. it will be overwritten + * with the real negotiated size later. + */ + sl->link_buf_size = 2; + + /* read the buffer size from the CAM */ + ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, + IRQEN | CMDREG_SR); + if (ret) + return ret; + ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ); + if (ret) + return ret; + ret = dvb_ca_en50221_read_data(ca, slot, buf, 2); + if (ret != 2) + return -EIO; + ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN); + if (ret) + 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; + sl->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 */ + ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, + IRQEN | CMDREG_SW); + if (ret) + return ret; + ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10); + if (ret) + return ret; + ret = dvb_ca_en50221_write_data(ca, slot, buf, 2); + if (ret != 2) + return -EIO; + ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN); + if (ret) + return ret; + + /* success */ + return 0; +} + +/** + * dvb_ca_en50221_read_tuple - Read a tuple from attribute memory. + * + * @ca: CA instance. + * @slot: Slot id. + * @address: Address to read from. Updated. + * @tuple_type: Tuple id byte. Updated. + * @tuple_length: Tuple length. Updated. + * @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 *tuple_type, + int *tuple_length, u8 *tuple) +{ + int i; + int _tuple_type; + int _tuple_length; + int _address = *address; + + /* grab the next tuple length and type */ + _tuple_type = ca->pub->read_attribute_mem(ca->pub, slot, _address); + if (_tuple_type < 0) + return _tuple_type; + if (_tuple_type == 0xff) { + dprintk("END OF CHAIN TUPLE type:0x%x\n", _tuple_type); + *address += 2; + *tuple_type = _tuple_type; + *tuple_length = 0; + return 0; + } + _tuple_length = ca->pub->read_attribute_mem(ca->pub, slot, + _address + 2); + if (_tuple_length < 0) + return _tuple_length; + _address += 4; + + dprintk("TUPLE type:0x%x length:%i\n", _tuple_type, _tuple_length); + + /* read in the whole tuple */ + for (i = 0; i < _tuple_length; 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 += (_tuple_length * 2); + + /* success */ + *tuple_type = _tuple_type; + *tuple_length = _tuple_length; + *address = _address; + return 0; +} + +/** + * dvb_ca_en50221_parse_attributes - Parse attribute memory of a CAM module, + * extracting Config register, and checking it is a DVB CAM module. + * + * @ca: CA instance. + * @slot: Slot id. + * + * return: 0 on success, <0 on failure. + */ +static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot) +{ + struct dvb_ca_slot *sl; + int address = 0; + int tuple_length; + int tuple_type; + 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 */ + status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type, + &tuple_length, tuple); + if (status < 0) + return status; + if (tuple_type != 0x1D) + return -EINVAL; + + /* CISTPL_DEVICE_0C */ + status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type, + &tuple_length, tuple); + if (status < 0) + return status; + if (tuple_type != 0x1C) + return -EINVAL; + + /* CISTPL_VERS_1 */ + status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type, + &tuple_length, tuple); + if (status < 0) + return status; + if (tuple_type != 0x15) + return -EINVAL; + + /* CISTPL_MANFID */ + status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type, + &tuple_length, tuple); + if (status < 0) + return status; + if (tuple_type != 0x20) + return -EINVAL; + if (tuple_length != 4) + return -EINVAL; + manfid = (tuple[1] << 8) | tuple[0]; + devid = (tuple[3] << 8) | tuple[2]; + + /* CISTPL_CONFIG */ + status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type, + &tuple_length, tuple); + if (status < 0) + return status; + if (tuple_type != 0x1A) + return -EINVAL; + if (tuple_length < 3) + return -EINVAL; + + /* extract the configbase */ + rasz = tuple[0] & 3; + if (tuple_length < (3 + rasz + 14)) + return -EINVAL; + sl = &ca->slot_info[slot]; + sl->config_base = 0; + for (i = 0; i < rasz + 1; i++) + sl->config_base |= (tuple[2 + i] << (8 * i)); + + /* check it contains the correct DVB string */ + dvb_str = findstr((char *)tuple, tuple_length, "DVB_CI_V", 8); + if (!dvb_str) + return -EINVAL; + if (tuple_length < ((dvb_str - (char *)tuple) + 12)) + return -EINVAL; + + /* is it a version we support? */ + if (strncmp(dvb_str + 8, "1.00", 4)) { + pr_err("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)) { + status = dvb_ca_en50221_read_tuple(ca, slot, &address, + &tuple_type, &tuple_length, + tuple); + if (status < 0) + return status; + switch (tuple_type) { + case 0x1B: /* CISTPL_CFTABLE_ENTRY */ + if (tuple_length < (2 + 11 + 17)) + break; + + /* if we've already parsed one, just use it */ + if (got_cftableentry) + break; + + /* get the config option */ + sl->config_option = tuple[0] & 0x3f; + + /* OK, check it contains the correct strings */ + if (!findstr((char *)tuple, tuple_length, + "DVB_HOST", 8) || + !findstr((char *)tuple, tuple_length, + "DVB_CI_MODULE", 13)) + 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 */ + dprintk("dvb_ca: Skipping unknown tuple type:0x%x length:0x%x\n", + tuple_type, tuple_length); + 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, sl->config_base, sl->config_option); + + /* success! */ + return 0; +} + +/** + * dvb_ca_en50221_set_configoption - Set CAM's configoption correctly. + * + * @ca: CA instance. + * @slot: Slot containing the CAM. + */ +static int dvb_ca_en50221_set_configoption(struct dvb_ca_private *ca, int slot) +{ + struct dvb_ca_slot *sl = &ca->slot_info[slot]; + int configoption; + + dprintk("%s\n", __func__); + + /* set the config option */ + ca->pub->write_attribute_mem(ca->pub, slot, sl->config_base, + sl->config_option); + + /* check it */ + configoption = ca->pub->read_attribute_mem(ca->pub, slot, + sl->config_base); + dprintk("Set configoption 0x%x, read configoption 0x%x\n", + sl->config_option, configoption & 0x3f); + + /* fine! */ + return 0; +} + +/** + * dvb_ca_en50221_read_data - 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. + * + * @ca: CA instance. + * @slot: Slot to read from. + * @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. + * @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) +{ + struct dvb_ca_slot *sl = &ca->slot_info[slot]; + 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) { + int buf_free; + + if (!sl->rx_buffer.data) { + status = -EIO; + goto exit; + } + buf_free = dvb_ringbuffer_free(&sl->rx_buffer); + + if (buf_free < (sl->link_buf_size + + DVB_RINGBUFFER_PKTHDRSIZE)) { + status = -EAGAIN; + goto exit; + } + } + + if (ca->pub->read_data && + (sl->slot_state != DVB_CA_SLOTSTATE_LINKINIT)) { + if (!ebuf) + status = ca->pub->read_data(ca->pub, slot, buf, + sizeof(buf)); + else + status = ca->pub->read_data(ca->pub, slot, buf, ecount); + if (status < 0) + return status; + bytes_read = status; + if (status == 0) + goto exit; + } else { + /* check if there is data available */ + status = ca->pub->read_cam_control(ca->pub, slot, + CTRLIF_STATUS); + if (status < 0) + goto exit; + if (!(status & STATUSREG_DA)) { + /* no data */ + status = 0; + goto exit; + } + + /* read the amount of data */ + status = ca->pub->read_cam_control(ca->pub, slot, + CTRLIF_SIZE_HIGH); + if (status < 0) + goto exit; + bytes_read = status << 8; + status = ca->pub->read_cam_control(ca->pub, slot, + CTRLIF_SIZE_LOW); + if (status < 0) + goto exit; + bytes_read |= status; + + /* check it will fit */ + if (!ebuf) { + if (bytes_read > sl->link_buf_size) { + pr_err("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, + sl->link_buf_size); + sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT; + status = -EIO; + goto exit; + } + if (bytes_read < 2) { + pr_err("dvb_ca adapter %d: CAM sent a buffer that was less than 2 bytes!\n", + ca->dvbdev->adapter->num); + sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT; + status = -EIO; + goto exit; + } + } else { + if (bytes_read > ecount) { + pr_err("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 */ + status = ca->pub->read_cam_control(ca->pub, slot, + CTRLIF_DATA); + if (status < 0) + goto exit; + + /* OK, store it in the buffer */ + buf[i] = status; + } + + /* check for read error (RE should now be 0) */ + status = ca->pub->read_cam_control(ca->pub, slot, + CTRLIF_STATUS); + if (status < 0) + goto exit; + if (status & STATUSREG_RE) { + sl->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) { + if (!sl->rx_buffer.data) { + status = -EIO; + goto exit; + } + dvb_ringbuffer_pkt_write(&sl->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; +} + +/** + * dvb_ca_en50221_write_data - This function talks to an EN50221 CAM control + * interface. It writes a buffer of data to a CAM. + * + * @ca: CA instance. + * @slot: Slot to write to. + * @buf: The data in this buffer is treated as a complete link-level packet to + * be written. + * @bytes_write: 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) +{ + struct dvb_ca_slot *sl = &ca->slot_info[slot]; + int status; + int i; + + dprintk("%s\n", __func__); + + /* sanity check */ + if (bytes_write > sl->link_buf_size) + return -EINVAL; + + if (ca->pub->write_data && + (sl->slot_state != DVB_CA_SLOTSTATE_LINKINIT)) + return ca->pub->write_data(ca->pub, slot, buf, bytes_write); + + /* + * it is possible we are dealing with a single buffer implementation, + * thus if there is data available for read or if there is even a read + * already in progress, we do nothing but awake the kernel thread to + * process the data if necessary. + */ + status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); + if (status < 0) + goto exitnowrite; + if (status & (STATUSREG_DA | STATUSREG_RE)) { + if (status & STATUSREG_DA) + dvb_ca_en50221_thread_wakeup(ca); + + status = -EAGAIN; + goto exitnowrite; + } + + /* OK, set HC bit */ + status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, + IRQEN | CMDREG_HC); + if (status) + goto exit; + + /* check if interface is still free */ + status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); + if (status < 0) + goto exit; + if (!(status & STATUSREG_FR)) { + /* it wasn't free => try again later */ + status = -EAGAIN; + goto exit; + } + + /* + * It may need some time for the CAM to settle down, or there might + * be a race condition between the CAM, writing HC and our last + * check for DA. This happens, if the CAM asserts DA, just after + * checking DA before we are setting HC. In this case it might be + * a bug in the CAM to keep the FR bit, the lower layer/HW + * communication requires a longer timeout or the CAM needs more + * time internally. But this happens in reality! + * We need to read the status from the HW again and do the same + * we did for the previous check for DA + */ + status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); + if (status < 0) + goto exit; + + if (status & (STATUSREG_DA | STATUSREG_RE)) { + if (status & STATUSREG_DA) + dvb_ca_en50221_thread_wakeup(ca); + + status = -EAGAIN; + goto exit; + } + + /* send the amount of data */ + status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_HIGH, + bytes_write >> 8); + if (status) + goto exit; + status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_SIZE_LOW, + bytes_write & 0xff); + if (status) + goto exit; + + /* send the buffer */ + for (i = 0; i < bytes_write; i++) { + status = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_DATA, + buf[i]); + if (status) + goto exit; + } + + /* check for write error (WE should now be 0) */ + status = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS); + if (status < 0) + goto exit; + if (status & STATUSREG_WE) { + sl->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; +} + +/* ************************************************************************** */ +/* EN50221 higher level functions */ + +/** + * dvb_ca_en50221_slot_shutdown - A CAM has been removed => shut it down. + * + * @ca: CA instance. + * @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; +} + +/** + * dvb_ca_en50221_camchange_irq - A CAMCHANGE IRQ has occurred. + * + * @pubca: CA instance. + * @slot: Slot concerned. + * @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; + struct dvb_ca_slot *sl = &ca->slot_info[slot]; + + 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; + } + + sl->camchange_type = change_type; + atomic_inc(&sl->camchange_count); + dvb_ca_en50221_thread_wakeup(ca); +} +EXPORT_SYMBOL(dvb_ca_en50221_camchange_irq); + +/** + * dvb_ca_en50221_camready_irq - A CAMREADY IRQ has occurred. + * + * @pubca: CA instance. + * @slot: Slot concerned. + */ +void dvb_ca_en50221_camready_irq(struct dvb_ca_en50221 *pubca, int slot) +{ + struct dvb_ca_private *ca = pubca->private; + struct dvb_ca_slot *sl = &ca->slot_info[slot]; + + dprintk("CAMREADY IRQ slot:%i\n", slot); + + if (sl->slot_state == DVB_CA_SLOTSTATE_WAITREADY) { + sl->slot_state = DVB_CA_SLOTSTATE_VALIDATE; + dvb_ca_en50221_thread_wakeup(ca); + } +} +EXPORT_SYMBOL(dvb_ca_en50221_camready_irq); + +/** + * dvb_ca_en50221_frda_irq - An FR or DA IRQ has occurred. + * + * @pubca: CA instance. + * @slot: Slot concerned. + */ +void dvb_ca_en50221_frda_irq(struct dvb_ca_en50221 *pubca, int slot) +{ + struct dvb_ca_private *ca = pubca->private; + struct dvb_ca_slot *sl = &ca->slot_info[slot]; + int flags; + + dprintk("FR/DA IRQ slot:%i\n", slot); + + switch (sl->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"); + sl->da_irq_supported = 1; + } + break; + + case DVB_CA_SLOTSTATE_RUNNING: + if (ca->open) + dvb_ca_en50221_thread_wakeup(ca); + break; + } +} +EXPORT_SYMBOL(dvb_ca_en50221_frda_irq); + +/* ************************************************************************** */ +/* EN50221 thread functions */ + +/** + * dvb_ca_en50221_thread_wakeup - Wake up the DVB CA thread + * + * @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); +} + +/** + * dvb_ca_en50221_thread_update_delay - Update the delay used by the thread. + * + * @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++) { + struct dvb_ca_slot *sl = &ca->slot_info[slot]; + + switch (sl->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 ((!sl->da_irq_supported) || + (!(ca->flags & DVB_CA_EN50221_FLAG_IRQ_DA))) + delay = HZ / 10; /* 100ms */ + } + break; + } + + if (delay < curdelay) + curdelay = delay; + } + + ca->delay = curdelay; +} + +/** + * dvb_ca_en50221_poll_cam_gone - Poll if the CAM is gone. + * + * @ca: CA instance. + * @slot: Slot to process. + * return:: 0 .. no change + * 1 .. CAM state changed + */ + +static int dvb_ca_en50221_poll_cam_gone(struct dvb_ca_private *ca, int slot) +{ + int changed = 0; + int status; + + /* + * 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); + changed = 1; + } + } + return changed; +} + +/** + * dvb_ca_en50221_thread_state_machine - Thread state machine for one CA slot + * to perform the data transfer. + * + * @ca: CA instance. + * @slot: Slot to process. + */ +static void dvb_ca_en50221_thread_state_machine(struct dvb_ca_private *ca, + int slot) +{ + struct dvb_ca_slot *sl = &ca->slot_info[slot]; + int flags; + int pktcount; + void *rxbuf; + + mutex_lock(&sl->slot_lock); + + /* check the cam status + deal with CAMCHANGEs */ + while (dvb_ca_en50221_check_camstatus(ca, slot)) { + /* clear down an old CI slot if necessary */ + if (sl->slot_state != DVB_CA_SLOTSTATE_NONE) + dvb_ca_en50221_slot_shutdown(ca, slot); + + /* if a CAM is NOW present, initialise it */ + if (sl->camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) + sl->slot_state = DVB_CA_SLOTSTATE_UNINITIALISED; + + /* we've handled one CAMCHANGE */ + dvb_ca_en50221_thread_update_delay(ca); + atomic_dec(&sl->camchange_count); + } + + /* CAM state machine */ + switch (sl->slot_state) { + case DVB_CA_SLOTSTATE_NONE: + case DVB_CA_SLOTSTATE_INVALID: + /* no action needed */ + break; + + case DVB_CA_SLOTSTATE_UNINITIALISED: + sl->slot_state = DVB_CA_SLOTSTATE_WAITREADY; + ca->pub->slot_reset(ca->pub, slot); + sl->timeout = jiffies + (INIT_TIMEOUT_SECS * HZ); + break; + + case DVB_CA_SLOTSTATE_WAITREADY: + if (time_after(jiffies, sl->timeout)) { + pr_err("dvb_ca adaptor %d: PC card did not respond :(\n", + ca->dvbdev->adapter->num); + sl->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) { + if (dvb_ca_en50221_poll_cam_gone(ca, slot)) + break; + + pr_err("dvb_ca adapter %d: Invalid PC card inserted :(\n", + ca->dvbdev->adapter->num); + sl->slot_state = DVB_CA_SLOTSTATE_INVALID; + dvb_ca_en50221_thread_update_delay(ca); + break; + } + if (dvb_ca_en50221_set_configoption(ca, slot) != 0) { + pr_err("dvb_ca adapter %d: Unable to initialise CAM :(\n", + ca->dvbdev->adapter->num); + sl->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) { + pr_err("dvb_ca adapter %d: Unable to reset CAM IF\n", + ca->dvbdev->adapter->num); + sl->slot_state = DVB_CA_SLOTSTATE_INVALID; + dvb_ca_en50221_thread_update_delay(ca); + break; + } + dprintk("DVB CAM validated successfully\n"); + + sl->timeout = jiffies + (INIT_TIMEOUT_SECS * HZ); + sl->slot_state = DVB_CA_SLOTSTATE_WAITFR; + ca->wakeup = 1; + break; + + case DVB_CA_SLOTSTATE_WAITFR: + if (time_after(jiffies, sl->timeout)) { + pr_err("dvb_ca adapter %d: DVB CAM did not respond :(\n", + ca->dvbdev->adapter->num); + sl->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) { + sl->slot_state = DVB_CA_SLOTSTATE_LINKINIT; + ca->wakeup = 1; + } + break; + + case DVB_CA_SLOTSTATE_LINKINIT: + if (dvb_ca_en50221_link_init(ca, slot) != 0) { + if (dvb_ca_en50221_poll_cam_gone(ca, slot)) + break; + + pr_err("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n", + ca->dvbdev->adapter->num); + sl->slot_state = DVB_CA_SLOTSTATE_UNINITIALISED; + dvb_ca_en50221_thread_update_delay(ca); + break; + } + + if (!sl->rx_buffer.data) { + rxbuf = vmalloc(RX_BUFFER_SIZE); + if (!rxbuf) { + pr_err("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n", + ca->dvbdev->adapter->num); + sl->slot_state = DVB_CA_SLOTSTATE_INVALID; + dvb_ca_en50221_thread_update_delay(ca); + break; + } + dvb_ringbuffer_init(&sl->rx_buffer, rxbuf, + RX_BUFFER_SIZE); + } + + ca->pub->slot_ts_enable(ca->pub, slot); + sl->slot_state = DVB_CA_SLOTSTATE_RUNNING; + dvb_ca_en50221_thread_update_delay(ca); + pr_info("dvb_ca adapter %d: DVB CAM detected and initialised successfully\n", + ca->dvbdev->adapter->num); + break; + + case DVB_CA_SLOTSTATE_RUNNING: + if (!ca->open) + break; + + /* poll slots for data */ + pktcount = 0; + while (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 don't 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) { + /* + * don't sleep; there is likely to be more data + * to read + */ + ca->wakeup = 1; + break; + } + } + break; + } + + mutex_unlock(&sl->slot_lock); +} + +/* + * 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; + + 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++) + dvb_ca_en50221_thread_state_machine(ca, slot); + } + + return 0; +} + +/* ************************************************************************** */ +/* EN50221 IO interface functions */ + +/** + * dvb_ca_en50221_io_do_ioctl - Real ioctl implementation. + * + * @file: File concerned. + * @cmd: IOCTL command. + * @parg: Associated argument. + * + * NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them. + * + * return: 0 on success, <0 on error. + */ +static int dvb_ca_en50221_io_do_ioctl(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__); + + if (mutex_lock_interruptible(&ca->ioctl_mutex)) + return -ERESTARTSYS; + + switch (cmd) { + case CA_RESET: + for (slot = 0; slot < ca->slot_count; slot++) { + struct dvb_ca_slot *sl = &ca->slot_info[slot]; + + mutex_lock(&sl->slot_lock); + if (sl->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); + } + mutex_unlock(&sl->slot_lock); + } + 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; + struct dvb_ca_slot *sl; + + slot = info->num; + if ((slot >= ca->slot_count) || (slot < 0)) { + err = -EINVAL; + goto out_unlock; + } + slot = array_index_nospec(slot, ca->slot_count); + + info->type = CA_CI_LINK; + info->flags = 0; + sl = &ca->slot_info[slot]; + if ((sl->slot_state != DVB_CA_SLOTSTATE_NONE) && + (sl->slot_state != DVB_CA_SLOTSTATE_INVALID)) { + info->flags = CA_CI_MODULE_PRESENT; + } + if (sl->slot_state == DVB_CA_SLOTSTATE_RUNNING) + info->flags |= CA_CI_MODULE_READY; + break; + } + + default: + err = -EINVAL; + break; + } + +out_unlock: + mutex_unlock(&ca->ioctl_mutex); + return err; +} + +/** + * dvb_ca_en50221_io_ioctl - Wrapper for ioctl implementation. + * + * @file: File concerned. + * @cmd: IOCTL command. + * @arg: Associated argument. + * + * return: 0 on success, <0 on error. + */ +static long dvb_ca_en50221_io_ioctl(struct file *file, + unsigned int cmd, unsigned long arg) +{ + return dvb_usercopy(file, cmd, arg, dvb_ca_en50221_io_do_ioctl); +} + +/** + * dvb_ca_en50221_io_write - Implementation of write() syscall. + * + * @file: File structure. + * @buf: Source buffer. + * @count: Size of source buffer. + * @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; + struct dvb_ca_slot *sl; + 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; + + if (slot >= ca->slot_count) + return -EINVAL; + slot = array_index_nospec(slot, ca->slot_count); + sl = &ca->slot_info[slot]; + + /* check if the slot is actually running */ + if (sl->slot_state != DVB_CA_SLOTSTATE_RUNNING) + return -EINVAL; + + /* fragment the packets & store in the buffer */ + while (fragpos < count) { + fraglen = sl->link_buf_size - 2; + if (fraglen < 0) + break; + if (fraglen > HOST_LINK_BUF_SIZE - 2) + fraglen = HOST_LINK_BUF_SIZE - 2; + if ((count - fragpos) < fraglen) + fraglen = count - fragpos; + + fragbuf[0] = connection_id; + fragbuf[1] = ((fragpos + fraglen) < count) ? 0x80 : 0x00; + status = copy_from_user(fragbuf + 2, buf + fragpos, fraglen); + if (status) { + status = -EFAULT; + 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 (sl->slot_state != DVB_CA_SLOTSTATE_RUNNING) { + status = -EIO; + goto exit; + } + + mutex_lock(&sl->slot_lock); + status = dvb_ca_en50221_write_data(ca, slot, fragbuf, + fraglen + 2); + mutex_unlock(&sl->slot_lock); + if (status == (fraglen + 2)) { + written = 1; + break; + } + if (status != -EAGAIN) + goto exit; + + usleep_range(1000, 1100); + } + 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)) { + struct dvb_ca_slot *sl = &ca->slot_info[slot]; + + if (sl->slot_state != DVB_CA_SLOTSTATE_RUNNING) + goto nextslot; + + if (!sl->rx_buffer.data) + return 0; + + idx = dvb_ringbuffer_pkt_next(&sl->rx_buffer, -1, &fraglen); + while (idx != -1) { + dvb_ringbuffer_pkt_read(&sl->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(&sl->rx_buffer, idx, + &fraglen); + } + +nextslot: + slot = (slot + 1) % ca->slot_count; + slot_count++; + } + + ca->next_read_slot = slot; + return found; +} + +/** + * dvb_ca_en50221_io_read - Implementation of read() syscall. + * + * @file: File structure. + * @buf: Destination buffer. + * @count: Size of destination buffer. + * @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; + struct dvb_ca_slot *sl; + 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 */ + status = dvb_ca_en50221_io_read_condition(ca, &result, &slot); + if (status == 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; + } + + sl = &ca->slot_info[slot]; + idx = dvb_ringbuffer_pkt_next(&sl->rx_buffer, -1, &fraglen); + pktlen = 2; + do { + if (idx == -1) { + pr_err("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(&sl->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; + + status = + dvb_ringbuffer_pkt_read_user(&sl->rx_buffer, + idx, 2, + buf + pktlen, + fraglen); + if (status < 0) + goto exit; + + pktlen += fraglen; + } + + if ((hdr[1] & 0x80) == 0) + last_fragment = 1; + dispose = 1; + } + + idx2 = dvb_ringbuffer_pkt_next(&sl->rx_buffer, idx, &fraglen); + if (dispose) + dvb_ringbuffer_pkt_dispose(&sl->rx_buffer, idx); + idx = idx2; + dispose = 0; + } while (!last_fragment); + + hdr[0] = slot; + hdr[1] = connection_id; + status = copy_to_user(buf, hdr, 2); + if (status) { + status = -EFAULT; + goto exit; + } + status = pktlen; + +exit: + return status; +} + +/** + * dvb_ca_en50221_io_open - Implementation of file open syscall. + * + * @inode: Inode concerned. + * @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++) { + struct dvb_ca_slot *sl = &ca->slot_info[i]; + + if (sl->slot_state == DVB_CA_SLOTSTATE_RUNNING) { + if (!sl->rx_buffer.data) { + /* + * it is safe to call this here without locks + * because ca->open == 0. Data is not read in + * this case + */ + dvb_ringbuffer_flush(&sl->rx_buffer); + } + } + } + + ca->open = 1; + dvb_ca_en50221_thread_update_delay(ca); + dvb_ca_en50221_thread_wakeup(ca); + + dvb_ca_private_get(ca); + + return 0; +} + +/** + * dvb_ca_en50221_io_release - Implementation of file close syscall. + * + * @inode: Inode concerned. + * @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); + + dvb_ca_private_put(ca); + + return err; +} + +/** + * dvb_ca_en50221_io_poll - Implementation of poll() syscall. + * + * @file: File concerned. + * @wait: poll wait table. + * + * return: Standard poll mask. + */ +static __poll_t 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; + __poll_t mask = 0; + int slot; + int result = 0; + + dprintk("%s\n", __func__); + + poll_wait(file, &ca->wait_queue, wait); + + if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) + mask |= EPOLLIN; + + /* if there is something, return now */ + if (mask) + return mask; + + if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) + mask |= EPOLLIN; + + return mask; +} + +static const struct file_operations dvb_ca_fops = { + .owner = THIS_MODULE, + .read = dvb_ca_en50221_io_read, + .write = dvb_ca_en50221_io_write, + .unlocked_ioctl = dvb_ca_en50221_io_ioctl, + .open = dvb_ca_en50221_io_open, + .release = dvb_ca_en50221_io_release, + .poll = dvb_ca_en50221_io_poll, + .llseek = noop_llseek, +}; + +static const struct dvb_device dvbdev_ca = { + .priv = NULL, + .users = 1, + .readers = 1, + .writers = 1, +#if defined(CONFIG_MEDIA_CONTROLLER_DVB) + .name = "dvb-ca-en50221", +#endif + .fops = &dvb_ca_fops, +}; + +/* ************************************************************************** */ +/* Initialisation/shutdown functions */ + +/** + * dvb_ca_en50221_init - Initialise a new DVB CA EN50221 interface device. + * + * @dvb_adapter: DVB adapter to attach the new CA device to. + * @pubca: The dvb_ca instance. + * @flags: Flags describing the CA device (DVB_CA_FLAG_*). + * @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 */ + ca = kzalloc(sizeof(*ca), GFP_KERNEL); + if (!ca) { + ret = -ENOMEM; + goto exit; + } + kref_init(&ca->refcount); + ca->pub = pubca; + ca->flags = flags; + ca->slot_count = slot_count; + ca->slot_info = kcalloc(slot_count, sizeof(struct dvb_ca_slot), + GFP_KERNEL); + if (!ca->slot_info) { + ret = -ENOMEM; + goto free_ca; + } + 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, 0); + if (ret) + goto free_slot_info; + + /* now initialise each slot */ + for (i = 0; i < slot_count; i++) { + struct dvb_ca_slot *sl = &ca->slot_info[i]; + + memset(sl, 0, sizeof(struct dvb_ca_slot)); + sl->slot_state = DVB_CA_SLOTSTATE_NONE; + atomic_set(&sl->camchange_count, 0); + sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED; + mutex_init(&sl->slot_lock); + } + + mutex_init(&ca->ioctl_mutex); + + if (signal_pending(current)) { + ret = -EINTR; + goto unregister_device; + } + 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); + pr_err("dvb_ca_init: failed to start kernel_thread (%d)\n", + ret); + goto unregister_device; + } + return 0; + +unregister_device: + dvb_unregister_device(ca->dvbdev); +free_slot_info: + kfree(ca->slot_info); +free_ca: + kfree(ca); +exit: + pubca->private = NULL; + return ret; +} +EXPORT_SYMBOL(dvb_ca_en50221_init); + +/** + * dvb_ca_en50221_release - Release a DVB CA EN50221 interface device. + * + * @pubca: 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); + + dvb_remove_device(ca->dvbdev); + dvb_ca_private_put(ca); + pubca->private = NULL; +} +EXPORT_SYMBOL(dvb_ca_en50221_release); |