| /* |
| * 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/vmalloc.h> |
| #include <linux/delay.h> |
| #include <linux/spinlock.h> |
| #include <linux/sched/signal.h> |
| #include <linux/kthread.h> |
| |
| #include "dvb_ca_en50221.h" |
| #include "dvb_ringbuffer.h" |
| |
| static int dvb_ca_en50221_debug; |
| |
| module_param_named(cam_debug, dvb_ca_en50221_debug, int, 0644); |
| MODULE_PARM_DESC(cam_debug, "enable verbose debug messages"); |
| |
| #define dprintk(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_err("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; |
| 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 unsigned int dvb_ca_en50221_io_poll(struct file *file, poll_table *wait) |
| { |
| struct dvb_device *dvbdev = file->private_data; |
| struct dvb_ca_private *ca = dvbdev->priv; |
| unsigned int mask = 0; |
| int slot; |
| int result = 0; |
| |
| dprintk("%s\n", __func__); |
| |
| if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) |
| mask |= POLLIN; |
| |
| /* if there is something, return now */ |
| if (mask) |
| return mask; |
| |
| /* wait for something to happen */ |
| poll_wait(file, &ca->wait_queue, wait); |
| |
| if (dvb_ca_en50221_io_read_condition(ca, &result, &slot) == 1) |
| mask |= POLLIN; |
| |
| return mask; |
| } |
| |
| 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); |