forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1943 lines
46 KiB
1943 lines
46 KiB
// 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 <[email protected]> |
|
* |
|
* 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_free_device(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); |
|
|
|
/** |
|
* 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 */ |
|
|
|
/** |
|
* 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); |
|
} |
|
|
|
/** |
|
* 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; |
|
} |
|
|
|
/** |
|
* 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; |
|
} |
|
|
|
/** |
|
* 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 */ |
|
|
|
/** |
|
* Real ioctl implementation. |
|
* NOTE: CA_SEND_MSG/CA_GET_MSG ioctls have userspace buffers passed to them. |
|
* |
|
* @file: File concerned. |
|
* @cmd: IOCTL command. |
|
* @parg: Associated argument. |
|
* |
|
* 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; |
|
} |
|
|
|
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; |
|
} |
|
|
|
/** |
|
* 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); |
|
} |
|
|
|
/** |
|
* 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; |
|
} |
|
|
|
/** |
|
* 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; |
|
} |
|
|
|
/** |
|
* 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; |
|
} |
|
|
|
/** |
|
* 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; |
|
} |
|
|
|
/** |
|
* 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 */ |
|
|
|
/** |
|
* 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); |
|
|
|
/** |
|
* 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);
|
|
|