forked from Minki/linux
d382c5be4c
As warned by smatch: drivers/media/dvb-core/dvb_ca_en50221.c:1392 dvb_ca_en50221_io_do_ioctl() warn: potential spectre issue 'ca->slot_info' [r] (local cap) There's a potential of using a CAM ioctl for speculation. The risk here is minimum, as only a small subset of DVB boards have CI, with a CAM module installed. Also, exploiting it would require a user capable of starting a DVB application. There are probably a lot of easier ways to try to exploit. Yet, it doesn't harm addressing it. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
1947 lines
47 KiB
C
1947 lines
47 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* dvb_ca.c: generic DVB functions for EN50221 CAM interfaces
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*
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* Copyright (C) 2004 Andrew de Quincey
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*
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* Parts of this file were based on sources as follows:
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*
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* Copyright (C) 2003 Ralph Metzler <rjkm@metzlerbros.de>
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*
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* based on code:
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*
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* Copyright (C) 1999-2002 Ralph Metzler
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* & Marcus Metzler for convergence integrated media GmbH
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*/
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#define pr_fmt(fmt) "dvb_ca_en50221: " fmt
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/nospec.h>
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#include <linux/vmalloc.h>
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#include <linux/delay.h>
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#include <linux/spinlock.h>
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#include <linux/sched/signal.h>
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#include <linux/kthread.h>
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#include <media/dvb_ca_en50221.h>
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#include <media/dvb_ringbuffer.h>
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static int dvb_ca_en50221_debug;
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module_param_named(cam_debug, dvb_ca_en50221_debug, int, 0644);
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MODULE_PARM_DESC(cam_debug, "enable verbose debug messages");
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#define dprintk(fmt, arg...) do { \
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if (dvb_ca_en50221_debug) \
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printk(KERN_DEBUG pr_fmt("%s: " fmt), __func__, ##arg);\
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} while (0)
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#define INIT_TIMEOUT_SECS 10
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#define HOST_LINK_BUF_SIZE 0x200
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#define RX_BUFFER_SIZE 65535
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#define MAX_RX_PACKETS_PER_ITERATION 10
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#define CTRLIF_DATA 0
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#define CTRLIF_COMMAND 1
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#define CTRLIF_STATUS 1
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#define CTRLIF_SIZE_LOW 2
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#define CTRLIF_SIZE_HIGH 3
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#define CMDREG_HC 1 /* Host control */
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#define CMDREG_SW 2 /* Size write */
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#define CMDREG_SR 4 /* Size read */
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#define CMDREG_RS 8 /* Reset interface */
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#define CMDREG_FRIE 0x40 /* Enable FR interrupt */
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#define CMDREG_DAIE 0x80 /* Enable DA interrupt */
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#define IRQEN (CMDREG_DAIE)
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#define STATUSREG_RE 1 /* read error */
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#define STATUSREG_WE 2 /* write error */
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#define STATUSREG_FR 0x40 /* module free */
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#define STATUSREG_DA 0x80 /* data available */
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#define DVB_CA_SLOTSTATE_NONE 0
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#define DVB_CA_SLOTSTATE_UNINITIALISED 1
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#define DVB_CA_SLOTSTATE_RUNNING 2
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#define DVB_CA_SLOTSTATE_INVALID 3
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#define DVB_CA_SLOTSTATE_WAITREADY 4
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#define DVB_CA_SLOTSTATE_VALIDATE 5
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#define DVB_CA_SLOTSTATE_WAITFR 6
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#define DVB_CA_SLOTSTATE_LINKINIT 7
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/* Information on a CA slot */
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struct dvb_ca_slot {
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/* current state of the CAM */
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int slot_state;
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/* mutex used for serializing access to one CI slot */
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struct mutex slot_lock;
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/* Number of CAMCHANGES that have occurred since last processing */
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atomic_t camchange_count;
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/* Type of last CAMCHANGE */
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int camchange_type;
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/* base address of CAM config */
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u32 config_base;
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/* value to write into Config Control register */
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u8 config_option;
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/* if 1, the CAM supports DA IRQs */
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u8 da_irq_supported:1;
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/* size of the buffer to use when talking to the CAM */
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int link_buf_size;
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/* buffer for incoming packets */
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struct dvb_ringbuffer rx_buffer;
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/* timer used during various states of the slot */
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unsigned long timeout;
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};
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/* Private CA-interface information */
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struct dvb_ca_private {
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struct kref refcount;
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/* pointer back to the public data structure */
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struct dvb_ca_en50221 *pub;
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/* the DVB device */
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struct dvb_device *dvbdev;
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/* Flags describing the interface (DVB_CA_FLAG_*) */
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u32 flags;
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/* number of slots supported by this CA interface */
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unsigned int slot_count;
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/* information on each slot */
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struct dvb_ca_slot *slot_info;
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/* wait queues for read() and write() operations */
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wait_queue_head_t wait_queue;
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/* PID of the monitoring thread */
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struct task_struct *thread;
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/* Flag indicating if the CA device is open */
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unsigned int open:1;
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/* Flag indicating the thread should wake up now */
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unsigned int wakeup:1;
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/* Delay the main thread should use */
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unsigned long delay;
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/*
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* Slot to start looking for data to read from in the next user-space
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* read operation
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*/
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int next_read_slot;
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/* mutex serializing ioctls */
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struct mutex ioctl_mutex;
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};
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static void dvb_ca_private_free(struct dvb_ca_private *ca)
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{
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unsigned int i;
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dvb_free_device(ca->dvbdev);
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for (i = 0; i < ca->slot_count; i++)
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vfree(ca->slot_info[i].rx_buffer.data);
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kfree(ca->slot_info);
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kfree(ca);
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}
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static void dvb_ca_private_release(struct kref *ref)
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{
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struct dvb_ca_private *ca;
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ca = container_of(ref, struct dvb_ca_private, refcount);
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dvb_ca_private_free(ca);
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}
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static void dvb_ca_private_get(struct dvb_ca_private *ca)
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{
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kref_get(&ca->refcount);
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}
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static void dvb_ca_private_put(struct dvb_ca_private *ca)
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{
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kref_put(&ca->refcount, dvb_ca_private_release);
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}
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static void dvb_ca_en50221_thread_wakeup(struct dvb_ca_private *ca);
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static int dvb_ca_en50221_read_data(struct dvb_ca_private *ca, int slot,
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u8 *ebuf, int ecount);
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static int dvb_ca_en50221_write_data(struct dvb_ca_private *ca, int slot,
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u8 *ebuf, int ecount);
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/**
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* findstr - Safely find needle in haystack.
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*
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* @haystack: Buffer to look in.
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* @hlen: Number of bytes in haystack.
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* @needle: Buffer to find.
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* @nlen: Number of bytes in needle.
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* return: Pointer into haystack needle was found at, or NULL if not found.
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*/
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static char *findstr(char *haystack, int hlen, char *needle, int nlen)
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{
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int i;
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if (hlen < nlen)
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return NULL;
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for (i = 0; i <= hlen - nlen; i++) {
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if (!strncmp(haystack + i, needle, nlen))
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return haystack + i;
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}
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return NULL;
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}
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/* ************************************************************************** */
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/* EN50221 physical interface functions */
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/*
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* dvb_ca_en50221_check_camstatus - Check CAM status.
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*/
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static int dvb_ca_en50221_check_camstatus(struct dvb_ca_private *ca, int slot)
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{
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struct dvb_ca_slot *sl = &ca->slot_info[slot];
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int slot_status;
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int cam_present_now;
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int cam_changed;
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/* IRQ mode */
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if (ca->flags & DVB_CA_EN50221_FLAG_IRQ_CAMCHANGE)
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return (atomic_read(&sl->camchange_count) != 0);
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/* poll mode */
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slot_status = ca->pub->poll_slot_status(ca->pub, slot, ca->open);
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cam_present_now = (slot_status & DVB_CA_EN50221_POLL_CAM_PRESENT) ? 1 : 0;
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cam_changed = (slot_status & DVB_CA_EN50221_POLL_CAM_CHANGED) ? 1 : 0;
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if (!cam_changed) {
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int cam_present_old = (sl->slot_state != DVB_CA_SLOTSTATE_NONE);
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cam_changed = (cam_present_now != cam_present_old);
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}
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if (cam_changed) {
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if (!cam_present_now)
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sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_REMOVED;
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else
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sl->camchange_type = DVB_CA_EN50221_CAMCHANGE_INSERTED;
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atomic_set(&sl->camchange_count, 1);
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} else {
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if ((sl->slot_state == DVB_CA_SLOTSTATE_WAITREADY) &&
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(slot_status & DVB_CA_EN50221_POLL_CAM_READY)) {
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/* move to validate state if reset is completed */
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sl->slot_state = DVB_CA_SLOTSTATE_VALIDATE;
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}
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}
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return cam_changed;
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}
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/**
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* dvb_ca_en50221_wait_if_status - Wait for flags to become set on the STATUS
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* register on a CAM interface, checking for errors and timeout.
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*
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* @ca: CA instance.
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* @slot: Slot on interface.
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* @waitfor: Flags to wait for.
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* @timeout_hz: Timeout in milliseconds.
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*
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* return: 0 on success, nonzero on error.
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*/
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static int dvb_ca_en50221_wait_if_status(struct dvb_ca_private *ca, int slot,
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u8 waitfor, int timeout_hz)
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{
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unsigned long timeout;
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unsigned long start;
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dprintk("%s\n", __func__);
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/* loop until timeout elapsed */
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start = jiffies;
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timeout = jiffies + timeout_hz;
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while (1) {
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int res;
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/* read the status and check for error */
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res = ca->pub->read_cam_control(ca->pub, slot, CTRLIF_STATUS);
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if (res < 0)
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return -EIO;
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/* if we got the flags, it was successful! */
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if (res & waitfor) {
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dprintk("%s succeeded timeout:%lu\n",
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__func__, jiffies - start);
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return 0;
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}
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/* check for timeout */
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if (time_after(jiffies, timeout))
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break;
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/* wait for a bit */
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usleep_range(1000, 1100);
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}
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dprintk("%s failed timeout:%lu\n", __func__, jiffies - start);
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/* if we get here, we've timed out */
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return -ETIMEDOUT;
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}
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/**
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* dvb_ca_en50221_link_init - Initialise the link layer connection to a CAM.
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*
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* @ca: CA instance.
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* @slot: Slot id.
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*
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* return: 0 on success, nonzero on failure.
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*/
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static int dvb_ca_en50221_link_init(struct dvb_ca_private *ca, int slot)
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{
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struct dvb_ca_slot *sl = &ca->slot_info[slot];
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int ret;
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int buf_size;
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u8 buf[2];
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dprintk("%s\n", __func__);
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/* we'll be determining these during this function */
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sl->da_irq_supported = 0;
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/*
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* set the host link buffer size temporarily. it will be overwritten
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* with the real negotiated size later.
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*/
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sl->link_buf_size = 2;
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/* read the buffer size from the CAM */
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ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
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IRQEN | CMDREG_SR);
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if (ret)
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return ret;
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ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_DA, HZ);
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if (ret)
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return ret;
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ret = dvb_ca_en50221_read_data(ca, slot, buf, 2);
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if (ret != 2)
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return -EIO;
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ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
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if (ret)
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return ret;
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/*
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* store it, and choose the minimum of our buffer and the CAM's buffer
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* size
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*/
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buf_size = (buf[0] << 8) | buf[1];
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if (buf_size > HOST_LINK_BUF_SIZE)
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buf_size = HOST_LINK_BUF_SIZE;
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sl->link_buf_size = buf_size;
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buf[0] = buf_size >> 8;
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buf[1] = buf_size & 0xff;
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dprintk("Chosen link buffer size of %i\n", buf_size);
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/* write the buffer size to the CAM */
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ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND,
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IRQEN | CMDREG_SW);
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if (ret)
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return ret;
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ret = dvb_ca_en50221_wait_if_status(ca, slot, STATUSREG_FR, HZ / 10);
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if (ret)
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return ret;
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ret = dvb_ca_en50221_write_data(ca, slot, buf, 2);
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if (ret != 2)
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return -EIO;
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ret = ca->pub->write_cam_control(ca->pub, slot, CTRLIF_COMMAND, IRQEN);
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if (ret)
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return ret;
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/* success */
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return 0;
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}
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/**
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* dvb_ca_en50221_read_tuple - Read a tuple from attribute memory.
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*
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* @ca: CA instance.
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* @slot: Slot id.
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* @address: Address to read from. Updated.
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* @tuple_type: Tuple id byte. Updated.
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* @tuple_length: Tuple length. Updated.
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* @tuple: Dest buffer for tuple (must be 256 bytes). Updated.
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*
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* return: 0 on success, nonzero on error.
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*/
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static int dvb_ca_en50221_read_tuple(struct dvb_ca_private *ca, int slot,
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int *address, int *tuple_type,
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int *tuple_length, u8 *tuple)
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{
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int i;
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int _tuple_type;
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int _tuple_length;
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int _address = *address;
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/* grab the next tuple length and type */
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_tuple_type = ca->pub->read_attribute_mem(ca->pub, slot, _address);
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if (_tuple_type < 0)
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return _tuple_type;
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if (_tuple_type == 0xff) {
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dprintk("END OF CHAIN TUPLE type:0x%x\n", _tuple_type);
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*address += 2;
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*tuple_type = _tuple_type;
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*tuple_length = 0;
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return 0;
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}
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_tuple_length = ca->pub->read_attribute_mem(ca->pub, slot,
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_address + 2);
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if (_tuple_length < 0)
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return _tuple_length;
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_address += 4;
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dprintk("TUPLE type:0x%x length:%i\n", _tuple_type, _tuple_length);
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/* read in the whole tuple */
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for (i = 0; i < _tuple_length; i++) {
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tuple[i] = ca->pub->read_attribute_mem(ca->pub, slot,
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_address + (i * 2));
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dprintk(" 0x%02x: 0x%02x %c\n",
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i, tuple[i] & 0xff,
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((tuple[i] > 31) && (tuple[i] < 127)) ? tuple[i] : '.');
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}
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_address += (_tuple_length * 2);
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/* success */
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*tuple_type = _tuple_type;
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*tuple_length = _tuple_length;
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*address = _address;
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return 0;
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}
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/**
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* dvb_ca_en50221_parse_attributes - Parse attribute memory of a CAM module,
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* extracting Config register, and checking it is a DVB CAM module.
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*
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* @ca: CA instance.
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* @slot: Slot id.
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*
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* return: 0 on success, <0 on failure.
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*/
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static int dvb_ca_en50221_parse_attributes(struct dvb_ca_private *ca, int slot)
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{
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struct dvb_ca_slot *sl;
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int address = 0;
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int tuple_length;
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int tuple_type;
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u8 tuple[257];
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char *dvb_str;
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int rasz;
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int status;
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int got_cftableentry = 0;
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int end_chain = 0;
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int i;
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u16 manfid = 0;
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u16 devid = 0;
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/* CISTPL_DEVICE_0A */
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status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
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&tuple_length, tuple);
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if (status < 0)
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return status;
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if (tuple_type != 0x1D)
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return -EINVAL;
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/* CISTPL_DEVICE_0C */
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status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
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&tuple_length, tuple);
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if (status < 0)
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return status;
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if (tuple_type != 0x1C)
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return -EINVAL;
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/* CISTPL_VERS_1 */
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status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
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&tuple_length, tuple);
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if (status < 0)
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return status;
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if (tuple_type != 0x15)
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return -EINVAL;
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/* CISTPL_MANFID */
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status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
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&tuple_length, tuple);
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if (status < 0)
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return status;
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if (tuple_type != 0x20)
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return -EINVAL;
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if (tuple_length != 4)
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return -EINVAL;
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manfid = (tuple[1] << 8) | tuple[0];
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devid = (tuple[3] << 8) | tuple[2];
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/* CISTPL_CONFIG */
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status = dvb_ca_en50221_read_tuple(ca, slot, &address, &tuple_type,
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&tuple_length, tuple);
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if (status < 0)
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return status;
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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);
|