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[media] winbond-cir: asynchronous tx

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Change winbond-cir's tx support to be asynchronous and not to mess with
the TX buffer. Essentially the winbond-cir counterpart to the patch
Sean Young sent for iguanair.

Signed-off-by: David Härdeman <david@hardeman.nu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
David Härdeman 2012-08-25 17:46:58 -03:00 committed by Mauro Carvalho Chehab
parent 30cedcf34f
commit 7bfb5dc1cd
1 changed files with 18 additions and 29 deletions
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47
drivers/media/rc/winbond-cir.c
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@ -180,7 +180,6 @@ enum wbcir_rxstate {
enum wbcir_txstate {
WBCIR_TXSTATE_INACTIVE = 0,
WBCIR_TXSTATE_ACTIVE,
WBCIR_TXSTATE_DONE,
WBCIR_TXSTATE_ERROR
};
@ -216,7 +215,6 @@ struct wbcir_data {
u32 txlen;
u32 txoff;
u32 *txbuf;
wait_queue_head_t txwaitq;
u8 txmask;
u32 txcarrier;
};
@ -424,11 +422,11 @@ wbcir_irq_tx(struct wbcir_data *data)
if (data->txstate == WBCIR_TXSTATE_ERROR)
/* Clear TX underrun bit */
outb(WBCIR_TX_UNDERRUN, data->sbase + WBCIR_REG_SP3_ASCR);
else
data->txstate = WBCIR_TXSTATE_DONE;
wbcir_set_irqmask(data, WBCIR_IRQ_RX | WBCIR_IRQ_ERR);
led_trigger_event(data->txtrigger, LED_OFF);
wake_up(&data->txwaitq);
kfree(data->txbuf);
data->txbuf = NULL;
data->txstate = WBCIR_TXSTATE_INACTIVE;
} else if (data->txoff == data->txlen) {
/* At the end of transmission, tell the hw before last byte */
outsb(data->sbase + WBCIR_REG_SP3_TXDATA, bytes, used - 1);
@ -579,43 +577,37 @@ wbcir_txmask(struct rc_dev *dev, u32 mask)
}
static int
wbcir_tx(struct rc_dev *dev, unsigned *buf, unsigned count)
wbcir_tx(struct rc_dev *dev, unsigned *b, unsigned count)
{
struct wbcir_data *data = dev->priv;
unsigned *buf;
unsigned i;
unsigned long flags;
buf = kmalloc(count * sizeof(*b), GFP_KERNEL);
if (!buf)
return -ENOMEM;
/* Convert values to multiples of 10us */
for (i = 0; i < count; i++)
buf[i] = DIV_ROUND_CLOSEST(b[i], 10);
/* Not sure if this is possible, but better safe than sorry */
spin_lock_irqsave(&data->spinlock, flags);
if (data->txstate != WBCIR_TXSTATE_INACTIVE) {
spin_unlock_irqrestore(&data->spinlock, flags);
kfree(buf);
return -EBUSY;
}
/* Convert values to multiples of 10us */
for (i = 0; i < count; i++)
buf[i] = DIV_ROUND_CLOSEST(buf[i], 10);
/* Fill the TX fifo once, the irq handler will do the rest */
data->txbuf = buf;
data->txlen = count;
data->txoff = 0;
wbcir_irq_tx(data);
/* Wait for the TX to complete */
while (data->txstate == WBCIR_TXSTATE_ACTIVE) {
spin_unlock_irqrestore(&data->spinlock, flags);
wait_event(data->txwaitq, data->txstate != WBCIR_TXSTATE_ACTIVE);
spin_lock_irqsave(&data->spinlock, flags);
}
/* We're done */
if (data->txstate == WBCIR_TXSTATE_ERROR)
count = -EAGAIN;
data->txstate = WBCIR_TXSTATE_INACTIVE;
data->txbuf = NULL;
spin_unlock_irqrestore(&data->spinlock, flags);
return count;
}
@ -927,13 +919,11 @@ wbcir_init_hw(struct wbcir_data *data)
ir_raw_event_reset(data->dev);
ir_raw_event_handle(data->dev);
/*
* Check TX state, if we did a suspend/resume cycle while TX was
* active, we will have a process waiting in txwaitq.
*/
/* Clear TX state */
if (data->txstate == WBCIR_TXSTATE_ACTIVE) {
data->txstate = WBCIR_TXSTATE_ERROR;
wake_up(&data->txwaitq);
kfree(data->txbuf);
data->txbuf = NULL;
data->txstate = WBCIR_TXSTATE_INACTIVE;
}
/* Enable interrupts */
@ -974,7 +964,6 @@ wbcir_probe(struct pnp_dev *device, const struct pnp_device_id *dev_id)
pnp_set_drvdata(device, data);
spin_lock_init(&data->spinlock);
init_waitqueue_head(&data->txwaitq);
data->ebase = pnp_port_start(device, 0);
data->wbase = pnp_port_start(device, 1);
data->sbase = pnp_port_start(device, 2);