diff options
| author | Ludovic Desroches <ludovic.desroches@atmel.com> | 2014-10-09 18:02:00 +0400 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2014-09-14 21:20:12 +0400 |
| commit | d4f51956ac8ad302db9b0c4e4232775b1baa7b44 (patch) | |
| tree | 453386d572137d274883a716658f25fc114a7610 /drivers/iio/adc/at91_adc.c | |
| parent | 1887e724e2b6df06847522fe9dc2ab53639516cc (diff) | |
| download | linux-d4f51956ac8ad302db9b0c4e4232775b1baa7b44.tar.xz | |
iio: adc: at91: don't use the last converted data register
If touchscreen mode is enabled and a conversion is requested on another
channel, the result in the last converted data register can be a
touchscreen relative value. Starting a conversion involves to do a
conversion for all active channel. It starts with ADC channels and ends
with touchscreen channels. Then if ADC_LCD register is not read quickly,
its content may be a touchscreen conversion.
To remove this temporal constraint, the conversion value is taken from
the channel data register.
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Cc: Stable@vger.kernel.org
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/adc/at91_adc.c')
| -rw-r--r-- | drivers/iio/adc/at91_adc.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c index 772e869c280e..7eadaf16adc1 100644 --- a/drivers/iio/adc/at91_adc.c +++ b/drivers/iio/adc/at91_adc.c @@ -196,6 +196,7 @@ struct at91_adc_state { bool done; int irq; u16 last_value; + int chnb; struct mutex lock; u8 num_channels; void __iomem *reg_base; @@ -274,7 +275,7 @@ void handle_adc_eoc_trigger(int irq, struct iio_dev *idev) disable_irq_nosync(irq); iio_trigger_poll(idev->trig); } else { - st->last_value = at91_adc_readl(st, AT91_ADC_LCDR); + st->last_value = at91_adc_readl(st, AT91_ADC_CHAN(st, st->chnb)); st->done = true; wake_up_interruptible(&st->wq_data_avail); } @@ -351,7 +352,7 @@ static irqreturn_t at91_adc_rl_interrupt(int irq, void *private) unsigned int reg; status &= at91_adc_readl(st, AT91_ADC_IMR); - if (status & st->registers->drdy_mask) + if (status & GENMASK(st->num_channels - 1, 0)) handle_adc_eoc_trigger(irq, idev); if (status & AT91RL_ADC_IER_PEN) { @@ -418,7 +419,7 @@ static irqreturn_t at91_adc_9x5_interrupt(int irq, void *private) AT91_ADC_IER_YRDY | AT91_ADC_IER_PRDY; - if (status & st->registers->drdy_mask) + if (status & GENMASK(st->num_channels - 1, 0)) handle_adc_eoc_trigger(irq, idev); if (status & AT91_ADC_IER_PEN) { @@ -689,9 +690,10 @@ static int at91_adc_read_raw(struct iio_dev *idev, case IIO_CHAN_INFO_RAW: mutex_lock(&st->lock); + st->chnb = chan->channel; at91_adc_writel(st, AT91_ADC_CHER, AT91_ADC_CH(chan->channel)); - at91_adc_writel(st, AT91_ADC_IER, st->registers->drdy_mask); + at91_adc_writel(st, AT91_ADC_IER, BIT(chan->channel)); at91_adc_writel(st, AT91_ADC_CR, AT91_ADC_START); ret = wait_event_interruptible_timeout(st->wq_data_avail, @@ -708,7 +710,7 @@ static int at91_adc_read_raw(struct iio_dev *idev, at91_adc_writel(st, AT91_ADC_CHDR, AT91_ADC_CH(chan->channel)); - at91_adc_writel(st, AT91_ADC_IDR, st->registers->drdy_mask); + at91_adc_writel(st, AT91_ADC_IDR, BIT(chan->channel)); st->last_value = 0; st->done = false; |