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media: dvb_ca_en50221: Refactored dvb_ca_en50221_thread

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Refactored "dvb_ca_en50221_thread" by moving the state machine into the
new function "dvb_ca_en50221_thread_state_machine". This reduces the
thread function size and reduces the structural complexity and of course
gives us more space to meet the line length goal in the new function.

Signed-off-by: Jasmin Jessich <jasmin@anw.at>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Jasmin Jessich 2017-07-15 20:43:02 -04:00 committed by Mauro Carvalho Chehab
parent d105d08344
commit a004b70e70
1 changed files with 208 additions and 175 deletions
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383
drivers/media/dvb-core/dvb_ca_en50221.c
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@ -1063,19 +1063,220 @@ static void dvb_ca_en50221_thread_update_delay(struct dvb_ca_private *ca)
ca->delay = curdelay; ca->delay = curdelay;
} }
/**
* 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 status;
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) {
/*
* 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)) {
sl->slot_state = DVB_CA_SLOTSTATE_NONE;
dvb_ca_en50221_thread_update_delay(ca);
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) {
/*
* 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)) {
sl->slot_state = DVB_CA_SLOTSTATE_NONE;
dvb_ca_en50221_thread_update_delay(ca);
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 dont 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) {
/*
* dont 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. * Kernel thread which monitors CA slots for CAM changes, and performs data
* transfers.
*/ */
static int dvb_ca_en50221_thread(void *data) static int dvb_ca_en50221_thread(void *data)
{ {
struct dvb_ca_private *ca = data; struct dvb_ca_private *ca = data;
int slot; int slot;
int flags;
int status;
int pktcount;
void *rxbuf;
dprintk("%s\n", __func__); dprintk("%s\n", __func__);
@ -1094,176 +1295,8 @@ static int dvb_ca_en50221_thread(void *data)
ca->wakeup = 0; ca->wakeup = 0;
/* go through all the slots processing them */ /* go through all the slots processing them */
for (slot = 0; slot < ca->slot_count; slot++) { for (slot = 0; slot < ca->slot_count; slot++)
dvb_ca_en50221_thread_state_machine(ca, slot);
mutex_lock(&ca->slot_info[slot].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 (ca->slot_info[slot].slot_state != DVB_CA_SLOTSTATE_NONE)
dvb_ca_en50221_slot_shutdown(ca, slot);
/* if a CAM is NOW present, initialise it */
if (ca->slot_info[slot].camchange_type == DVB_CA_EN50221_CAMCHANGE_INSERTED) {
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_UNINITIALISED;
}
/* we've handled one CAMCHANGE */
dvb_ca_en50221_thread_update_delay(ca);
atomic_dec(&ca->slot_info[slot].camchange_count);
}
// CAM state machine
switch (ca->slot_info[slot].slot_state) {
case DVB_CA_SLOTSTATE_NONE:
case DVB_CA_SLOTSTATE_INVALID:
// no action needed
break;
case DVB_CA_SLOTSTATE_UNINITIALISED:
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITREADY;
ca->pub->slot_reset(ca->pub, slot);
ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
break;
case DVB_CA_SLOTSTATE_WAITREADY:
if (time_after(jiffies, ca->slot_info[slot].timeout)) {
pr_err("dvb_ca adaptor %d: PC card did not respond :(\n",
ca->dvbdev->adapter->num);
ca->slot_info[slot].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) {
/* 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);
break;
}
}
pr_err("dvb_ca adapter %d: Invalid PC card inserted :(\n",
ca->dvbdev->adapter->num);
ca->slot_info[slot].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);
ca->slot_info[slot].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);
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
dvb_ca_en50221_thread_update_delay(ca);
break;
}
dprintk("DVB CAM validated successfully\n");
ca->slot_info[slot].timeout = jiffies + (INIT_TIMEOUT_SECS * HZ);
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_WAITFR;
ca->wakeup = 1;
break;
case DVB_CA_SLOTSTATE_WAITFR:
if (time_after(jiffies, ca->slot_info[slot].timeout)) {
pr_err("dvb_ca adapter %d: DVB CAM did not respond :(\n",
ca->dvbdev->adapter->num);
ca->slot_info[slot].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) {
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_LINKINIT;
ca->wakeup = 1;
}
break;
case DVB_CA_SLOTSTATE_LINKINIT:
if (dvb_ca_en50221_link_init(ca, slot) != 0) {
/* 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);
break;
}
}
pr_err("dvb_ca adapter %d: DVB CAM link initialisation failed :(\n",
ca->dvbdev->adapter->num);
ca->slot_info[slot].slot_state =
DVB_CA_SLOTSTATE_UNINITIALISED;
dvb_ca_en50221_thread_update_delay(ca);
break;
}
if (ca->slot_info[slot].rx_buffer.data == NULL) {
rxbuf = vmalloc(RX_BUFFER_SIZE);
if (rxbuf == NULL) {
pr_err("dvb_ca adapter %d: Unable to allocate CAM rx buffer :(\n",
ca->dvbdev->adapter->num);
ca->slot_info[slot].slot_state = DVB_CA_SLOTSTATE_INVALID;
dvb_ca_en50221_thread_update_delay(ca);
break;
}
dvb_ringbuffer_init(&ca->slot_info[slot].rx_buffer, rxbuf, RX_BUFFER_SIZE);
}
ca->pub->slot_ts_enable(ca->pub, slot);
ca->slot_info[slot].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 ((status = 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 dont 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) {
// dont sleep; there is likely to be more data to read
ca->wakeup = 1;
break;
}
}
break;
}
mutex_unlock(&ca->slot_info[slot].slot_lock);
}
} }
return 0; return 0;