| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Michael Hunold | 5784 | 78.34% | 4 | 5.97% |
| Jasmin J | 822 | 11.13% | 15 | 22.39% |
| Max Kellermann | 162 | 2.19% | 3 | 4.48% |
| Ralph Metzler | 144 | 1.95% | 3 | 4.48% |
| Mauro Carvalho Chehab | 106 | 1.44% | 10 | 14.93% |
| Matthias Dahl | 70 | 0.95% | 1 | 1.49% |
| Christoph Hellwig | 45 | 0.61% | 1 | 1.49% |
| Nikolaus Schulz | 35 | 0.47% | 1 | 1.49% |
| Dan Carpenter | 33 | 0.45% | 3 | 4.48% |
| Robert Schedel | 32 | 0.43% | 1 | 1.49% |
| Andrew de Quincey | 30 | 0.41% | 2 | 2.99% |
| Al Viro | 27 | 0.37% | 4 | 5.97% |
| Harvey Harrison | 17 | 0.23% | 1 | 1.49% |
| Oliver Endriss | 16 | 0.22% | 1 | 1.49% |
| SF Markus Elfring | 12 | 0.16% | 1 | 1.49% |
| Marko Schluessler | 12 | 0.16% | 2 | 2.99% |
| Colin Ian King | 12 | 0.16% | 1 | 1.49% |
| Arnd Bergmann | 8 | 0.11% | 3 | 4.48% |
| Panagiotis Issaris | 4 | 0.05% | 1 | 1.49% |
| Johannes Stezenbach | 3 | 0.04% | 2 | 2.99% |
| Linus Torvalds | 2 | 0.03% | 1 | 1.49% |
| Tim Schmielau | 2 | 0.03% | 1 | 1.49% |
| Dominique Dumont | 1 | 0.01% | 1 | 1.49% |
| Daniel Scheller | 1 | 0.01% | 1 | 1.49% |
| Sakari Ailus | 1 | 0.01% | 1 | 1.49% |
| Ingo Molnar | 1 | 0.01% | 1 | 1.49% |
| Jan Engelhardt | 1 | 0.01% | 1 | 1.49% |
| Total | 7383 | 67 |
/* * dvb_ca.c: generic DVB functions for EN50221 CAM interfaces * * Copyright (C) 2004 Andrew de Quincey * * Parts of this file were based on sources as follows: * * Copyright (C) 2003 Ralph Metzler <rjkm@metzlerbros.de> * * based on code: * * Copyright (C) 1999-2002 Ralph Metzler * & Marcus Metzler for convergence integrated media GmbH * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * To obtain the license, point your browser to * http://www.gnu.org/copyleft/gpl.html */ #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__); if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) mask |= EPOLLIN; /* if there is something, return now */ if (mask) return mask; /* wait for something to happen */ poll_wait(file, &ca->wait_queue, wait); if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) mask |= 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);
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