From 7bfb5dc1cd7f6c98f85aff27b5091f9cbbc2932f Mon Sep 17 00:00:00 2001 From: David Härdeman Date: Sat, 25 Aug 2012 17:46:58 -0300 Subject: [media] winbond-cir: asynchronous tx 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 Signed-off-by: Mauro Carvalho Chehab --- drivers/media/rc/winbond-cir.c | 47 ++++++++++++++++-------------------------- 1 file changed, 18 insertions(+), 29 deletions(-) (limited to 'drivers/media/rc/winbond-cir.c') diff --git a/drivers/media/rc/winbond-cir.c b/drivers/media/rc/winbond-cir.c index 29e6769b91a8..30ae1f24abc3 100644 --- a/drivers/media/rc/winbond-cir.c +++ b/drivers/media/rc/winbond-cir.c @@ -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); -- cgit v1.2.3-55-g7522