Hello,
On 15-08-04 03:18:46, Duan Andy wrote:
> From: Sanchayan Maity <maitysanchayan@xxxxxxxxx> Sent: Monday, August 03, 2015 11:10 PM
> > To: jic23@xxxxxxxxxx; linux-iio@xxxxxxxxxxxxxxx
> > Cc: stefan@xxxxxxxx; Duan Fugang-B38611; hofrat@xxxxxxxxx;
> > sanjeev_sharma@xxxxxxxxxx; Estevam Fabio-R49496; knaack.h@xxxxxx;
> > lars@xxxxxxxxxx; pmeerw@xxxxxxxxxx; antoine.tenart@xxxxxxxxxxxxxxxxxx;
> > linux-kernel@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx;
> > Sanchayan Maity
> > Subject: [PATCH] iio: adc: vf610: Add IIO buffer support for Vybrid ADC
> >
> > This patch adds support for IIO buffer to the Vybrid ADC driver.
> > IIO triggered buffer infrastructure along with iio sysfs trigger is used
> > to leverage continuous sampling support provided by the ADC block.
> >
> > Signed-off-by: Sanchayan Maity <maitysanchayan@xxxxxxxxx>
> > ---
> > drivers/iio/adc/Kconfig | 4 ++
> > drivers/iio/adc/vf610_adc.c | 122
> > +++++++++++++++++++++++++++++++++++++++++---
> > 2 files changed, 120 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index
> > 7c55658..4661241 100644
> > --- a/drivers/iio/adc/Kconfig
> > +++ b/drivers/iio/adc/Kconfig
> > @@ -337,6 +337,10 @@ config TWL6030_GPADC config VF610_ADC
> > tristate "Freescale vf610 ADC driver"
> > depends on OF
> > + select IIO_BUFFER
> > + select IIO_TRIGGER
> > + select IIO_SYSFS_TRIGGER
> > + select IIO_TRIGGERED_BUFFER
> > help
> > Say yes here to support for Vybrid board analog-to-digital
> > converter.
> > Since the IP is used for i.MX6SLX, the driver also support
> > i.MX6SLX.
> > diff --git a/drivers/iio/adc/vf610_adc.c b/drivers/iio/adc/vf610_adc.c
> > index 23b8fb9..af72b9a 100644
> > --- a/drivers/iio/adc/vf610_adc.c
> > +++ b/drivers/iio/adc/vf610_adc.c
> > @@ -34,8 +34,11 @@
> > #include <linux/err.h>
> >
> > #include <linux/iio/iio.h>
> > +#include <linux/iio/buffer.h>
> > #include <linux/iio/sysfs.h>
> > -#include <linux/iio/driver.h>
> > +#include <linux/iio/trigger.h>
> > +#include <linux/iio/trigger_consumer.h> #include
> > +<linux/iio/triggered_buffer.h>
> >
> > /* This will be the driver name the kernel reports */ #define
> > DRIVER_NAME "vf610-adc"
> > @@ -170,6 +173,7 @@ struct vf610_adc {
> > u32 sample_freq_avail[5];
> >
> > struct completion completion;
> > + u16 *buffer;
> > };
> >
> > static const u32 vf610_hw_avgs[] = { 1, 4, 8, 16, 32 }; @@ -505,12
> > +509,22 @@ static const struct iio_chan_spec_ext_info vf610_ext_info[] =
> > {
> > .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
> > BIT(IIO_CHAN_INFO_SAMP_FREQ), \
> > .ext_info = vf610_ext_info, \
> > + .address = (_idx), \
> > + .scan_index = (_idx), \
> > + .scan_type.sign = 'u', \
> > + .scan_type.realbits = 12, \
> > + .scan_type.storagebits = 16, \
> > }
> >
> > #define VF610_ADC_TEMPERATURE_CHAN(_idx, _chan_type) { \
> > .type = (_chan_type), \
> > .channel = (_idx), \
> > .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
> > + .address = (_idx), \
> > + .scan_index = (_idx), \
> > + .scan_type.sign = 'u', \
> > + .scan_type.realbits = 12, \
> > + .scan_type.storagebits = 16, \
> > }
> >
> > static const struct iio_chan_spec vf610_adc_iio_channels[] = { @@ -531,6
> > +545,7 @@ static const struct iio_chan_spec vf610_adc_iio_channels[] = {
> > VF610_ADC_CHAN(14, IIO_VOLTAGE),
> > VF610_ADC_CHAN(15, IIO_VOLTAGE),
> > VF610_ADC_TEMPERATURE_CHAN(26, IIO_TEMP),
> > + IIO_CHAN_SOFT_TIMESTAMP(32),
> > /* sentinel */
> > };
> >
> > @@ -559,13 +574,21 @@ static int vf610_adc_read_data(struct vf610_adc
> > *info)
> >
> > static irqreturn_t vf610_adc_isr(int irq, void *dev_id) {
> > - struct vf610_adc *info = (struct vf610_adc *)dev_id;
> > + struct iio_dev *indio_dev = (struct iio_dev *)dev_id;
> > + struct vf610_adc *info = iio_priv(indio_dev);
> > int coco;
> >
> > coco = readl(info->regs + VF610_REG_ADC_HS);
> > if (coco & VF610_ADC_HS_COCO0) {
> > info->value = vf610_adc_read_data(info);
> > - complete(&info->completion);
> > + if (iio_buffer_enabled(indio_dev)) {
> > + info->buffer[0] = info->value;
> > + writel(0, info->regs + VF610_REG_ADC_HS);
> The register is read only. After ADC_Rn is read, the coco bit is cleared.
Right. This crept in from a different implementation which I was trying with
PDB and perhaps a wrong interpretation of the TRM.
Will fix.
Regards,
Sanchayan.
(snip)
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