LinuxLists.cc - [PATCH] iio: adc: ad7124: add 3db filter

2020-01-22 08:55:43

Subject: [PATCH] iio: adc: ad7124: add 3db filter

This patch adds the LOW_PASS_FILTER_3DB_FREQUENCY attribute
in iio_chan_spec for each channel. The used filters are sinc3
or sinc4. The filter type with the highest output data rate
is used when setting a low pass frequency in the channel's sysfs.

Signed-off-by: Alexandru Tachici <[email protected]>
---
drivers/iio/adc/ad7124.c | 69 +++++++++++++++++++++++++++++++++++++++-
1 file changed, 68 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/ad7124.c b/drivers/iio/adc/ad7124.c
index 52f45b13da4a..8f48c0581f02 100644
--- a/drivers/iio/adc/ad7124.c
+++ b/drivers/iio/adc/ad7124.c
@@ -70,6 +70,11 @@
/* AD7124_FILTER_X */
#define AD7124_FILTER_FS_MSK GENMASK(10, 0)
#define AD7124_FILTER_FS(x) FIELD_PREP(AD7124_FILTER_FS_MSK, x)
+#define AD7124_FILTER_TYPE_MSK GENMASK(23, 21)
+#define AD7124_FILTER_TYPE_SEL(x) FIELD_PREP(AD7124_FILTER_TYPE_MSK, x)
+
+#define AD7124_SINC3_FILTER 2
+#define AD7124_SINC4_FILTER 0

enum ad7124_ids {
ID_AD7124_4,
@@ -119,6 +124,7 @@ struct ad7124_channel_config {
unsigned int vref_mv;
unsigned int pga_bits;
unsigned int odr;
+ unsigned int filter_type;
};

struct ad7124_state {
@@ -138,7 +144,8 @@ static const struct iio_chan_spec ad7124_channel_template = {
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_OFFSET) |
- BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ BIT(IIO_CHAN_INFO_SAMP_FREQ) |
+ BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
.scan_type = {
.sign = 'u',
.realbits = 24,
@@ -281,6 +288,58 @@ static int ad7124_set_channel_gain(struct ad7124_state *st,
return 0;
}

+static int ad7124_get_3db_filter_freq(struct ad7124_state *st,
+ unsigned int channel)
+{
+ unsigned int fadc;
+
+ fadc = st->channel_config[channel].odr;
+
+ switch (st->channel_config[channel].filter_type) {
+ case AD7124_SINC3_FILTER:
+ return DIV_ROUND_CLOSEST(fadc * 230, 1000);
+ case AD7124_SINC4_FILTER:
+ return DIV_ROUND_CLOSEST(fadc * 262, 1000);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ad7124_set_3db_filter_freq(struct ad7124_state *st,
+ unsigned int channel,
+ unsigned int freq)
+{
+ unsigned int sinc4_3db_odr;
+ unsigned int sinc3_3db_odr;
+ unsigned int new_filter;
+ unsigned int new_odr;
+
+ sinc4_3db_odr = DIV_ROUND_CLOSEST(freq * 1000, 230);
+ sinc3_3db_odr = DIV_ROUND_CLOSEST(freq * 1000, 262);
+
+ if (sinc4_3db_odr > sinc3_3db_odr) {
+ new_filter = AD7124_SINC3_FILTER;
+ new_odr = sinc4_3db_odr;
+ } else {
+ new_filter = AD7124_SINC4_FILTER;
+ new_odr = sinc3_3db_odr;
+ }
+
+ if (st->channel_config[channel].filter_type != new_filter) {
+ int ret;
+
+ st->channel_config[channel].filter_type = new_filter;
+ ret = ad7124_spi_write_mask(st, AD7124_FILTER(channel),
+ AD7124_FILTER_TYPE_MSK,
+ AD7124_FILTER_TYPE_SEL(new_filter),
+ 3);
+ if (ret < 0)
+ return ret;
+ }
+
+ return ad7124_set_channel_odr(st, channel, new_odr);
+}
+
static int ad7124_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long info)
@@ -322,6 +381,9 @@ static int ad7124_read_raw(struct iio_dev *indio_dev,
case IIO_CHAN_INFO_SAMP_FREQ:
*val = st->channel_config[chan->address].odr;

+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+ *val = ad7124_get_3db_filter_freq(st, chan->scan_index);
return IIO_VAL_INT;
default:
return -EINVAL;
@@ -355,6 +417,11 @@ static int ad7124_write_raw(struct iio_dev *indio_dev,
gain = DIV_ROUND_CLOSEST(res, val2);

return ad7124_set_channel_gain(st, chan->address, gain);
+ case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+ if (val2 != 0)
+ return -EINVAL;
+
+ return ad7124_set_3db_filter_freq(st, chan->address, val);
default:
return -EINVAL;
}
--
2.20.1

2020-02-02 16:23:34

by Jonathan Cameron

[permalink] [raw]

Subject: Re: [PATCH] iio: adc: ad7124: add 3db filter

On Wed, 22 Jan 2020 10:54:14 +0200
Alexandru Tachici <[email protected]> wrote:

> This patch adds the LOW_PASS_FILTER_3DB_FREQUENCY attribute
> in iio_chan_spec for each channel. The used filters are sinc3
> or sinc4. The filter type with the highest output data rate
> is used when setting a low pass frequency in the channel's sysfs.
>
> Signed-off-by: Alexandru Tachici <[email protected]>

Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

thanks,

Jonathan

> ---
> drivers/iio/adc/ad7124.c | 69 +++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 68 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/iio/adc/ad7124.c b/drivers/iio/adc/ad7124.c
> index 52f45b13da4a..8f48c0581f02 100644
> --- a/drivers/iio/adc/ad7124.c
> +++ b/drivers/iio/adc/ad7124.c
> @@ -70,6 +70,11 @@
> /* AD7124_FILTER_X */
> #define AD7124_FILTER_FS_MSK GENMASK(10, 0)
> #define AD7124_FILTER_FS(x) FIELD_PREP(AD7124_FILTER_FS_MSK, x)
> +#define AD7124_FILTER_TYPE_MSK GENMASK(23, 21)
> +#define AD7124_FILTER_TYPE_SEL(x) FIELD_PREP(AD7124_FILTER_TYPE_MSK, x)
> +
> +#define AD7124_SINC3_FILTER 2
> +#define AD7124_SINC4_FILTER 0
>
> enum ad7124_ids {
> ID_AD7124_4,
> @@ -119,6 +124,7 @@ struct ad7124_channel_config {
> unsigned int vref_mv;
> unsigned int pga_bits;
> unsigned int odr;
> + unsigned int filter_type;
> };
>
> struct ad7124_state {
> @@ -138,7 +144,8 @@ static const struct iio_chan_spec ad7124_channel_template = {
> .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
> BIT(IIO_CHAN_INFO_SCALE) |
> BIT(IIO_CHAN_INFO_OFFSET) |
> - BIT(IIO_CHAN_INFO_SAMP_FREQ),
> + BIT(IIO_CHAN_INFO_SAMP_FREQ) |
> + BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
> .scan_type = {
> .sign = 'u',
> .realbits = 24,
> @@ -281,6 +288,58 @@ static int ad7124_set_channel_gain(struct ad7124_state *st,
> return 0;
> }
>
> +static int ad7124_get_3db_filter_freq(struct ad7124_state *st,
> + unsigned int channel)
> +{
> + unsigned int fadc;
> +
> + fadc = st->channel_config[channel].odr;
> +
> + switch (st->channel_config[channel].filter_type) {
> + case AD7124_SINC3_FILTER:
> + return DIV_ROUND_CLOSEST(fadc * 230, 1000);
> + case AD7124_SINC4_FILTER:
> + return DIV_ROUND_CLOSEST(fadc * 262, 1000);
> + default:
> + return -EINVAL;
> + }
> +}
> +
> +static int ad7124_set_3db_filter_freq(struct ad7124_state *st,
> + unsigned int channel,
> + unsigned int freq)
> +{
> + unsigned int sinc4_3db_odr;
> + unsigned int sinc3_3db_odr;
> + unsigned int new_filter;
> + unsigned int new_odr;
> +
> + sinc4_3db_odr = DIV_ROUND_CLOSEST(freq * 1000, 230);
> + sinc3_3db_odr = DIV_ROUND_CLOSEST(freq * 1000, 262);
> +
> + if (sinc4_3db_odr > sinc3_3db_odr) {
> + new_filter = AD7124_SINC3_FILTER;
> + new_odr = sinc4_3db_odr;
> + } else {
> + new_filter = AD7124_SINC4_FILTER;
> + new_odr = sinc3_3db_odr;
> + }
> +
> + if (st->channel_config[channel].filter_type != new_filter) {
> + int ret;
> +
> + st->channel_config[channel].filter_type = new_filter;
> + ret = ad7124_spi_write_mask(st, AD7124_FILTER(channel),
> + AD7124_FILTER_TYPE_MSK,
> + AD7124_FILTER_TYPE_SEL(new_filter),
> + 3);
> + if (ret < 0)
> + return ret;
> + }
> +
> + return ad7124_set_channel_odr(st, channel, new_odr);
> +}
> +
> static int ad7124_read_raw(struct iio_dev *indio_dev,
> struct iio_chan_spec const *chan,
> int *val, int *val2, long info)
> @@ -322,6 +381,9 @@ static int ad7124_read_raw(struct iio_dev *indio_dev,
> case IIO_CHAN_INFO_SAMP_FREQ:
> *val = st->channel_config[chan->address].odr;
>
> + return IIO_VAL_INT;
> + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
> + *val = ad7124_get_3db_filter_freq(st, chan->scan_index);
> return IIO_VAL_INT;
> default:
> return -EINVAL;
> @@ -355,6 +417,11 @@ static int ad7124_write_raw(struct iio_dev *indio_dev,
> gain = DIV_ROUND_CLOSEST(res, val2);
>
> return ad7124_set_channel_gain(st, chan->address, gain);
> + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
> + if (val2 != 0)
> + return -EINVAL;
> +
> + return ad7124_set_3db_filter_freq(st, chan->address, val);
> default:
> return -EINVAL;
> }

2020-02-05 17:15:47

by Alexandru Tachici

[permalink] [raw]

Subject: [PATCH 0/5 V2] iio: adc: ad7192: move out of staging

This series of patches aim to move the ad7192 ADC from staging
into mainline.

1. Makes probe fail in case get_voltage returns an error.

2. Changed the iio_chan_spec talbes in order to set the required
attributes at compile time.

3. Removed spi_device_id table and moved ID_* in of_Device_id table.

4. Updates inline sysfs docs.

5. Full-diff patch to move the ad7192 out of staging.

Alexandru Tachici (5):
staging: iio: adc: ad7192: fail probe on get_voltage
staging: iio: adc: ad7192: modify iio_chan_spec array
staging: iio: adc: ad7192: removed spi_device_id
Documentation: ABI: testing: ad7192: update sysfs docs
staging: iio: adc: ad7192: move out of staging

.../ABI/testing/sysfs-bus-iio-adc-ad7192 | 17 +-
MAINTAINERS | 8 +
drivers/iio/adc/Kconfig | 12 +
drivers/iio/adc/Makefile | 1 +
drivers/iio/adc/ad7192.c | 1043 +++++++++++++++++
.../iio/Documentation/sysfs-bus-iio-ad7192 | 20 -
drivers/staging/iio/adc/Kconfig | 12 -
drivers/staging/iio/adc/Makefile | 1 -
drivers/staging/iio/adc/ad7192.c | 1022 ----------------
9 files changed, 1075 insertions(+), 1061 deletions(-)
create mode 100644 drivers/iio/adc/ad7192.c
delete mode 100644 drivers/staging/iio/Documentation/sysfs-bus-iio-ad7192
delete mode 100644 drivers/staging/iio/adc/ad7192.c

--
2.20.1

2020-02-05 17:16:45

by Alexandru Tachici

[permalink] [raw]

On Mon, 10 Feb 2020 06:43:16 +0000
"Ardelean, Alexandru" <[email protected]> wrote:

> On Thu, 2020-02-06 at 10:20 +0000, Jonathan Cameron wrote:
> > [External]
> >
> > On Thu, 6 Feb 2020 10:10:48 +0000
> > Jonathan Cameron <[email protected]> wrote:
> >
> > > On Wed, 5 Feb 2020 19:15:11 +0200
> > > Alexandru Tachici <[email protected]> wrote:
> > >
> > > > Move ad7192 ADC driver out of staging into mainline.
> > > >
> > > > Signed-off-by: Alexandru Tachici <[email protected]>
> > >
> > > Nice. To my eyes only remaining bits are the minor tweaks in earlier
> > > patches in this series.
> > >
> > > If anyone else has time to look at this one that would be great of
> > > course!
> > >
> > > Only 2 more ADC drivers to go in staging after this one :)
> > Speaking of which:
> >
> > ad7816 is obsolete so up to Analog to decide if you want to deal with it
> > or just drop the driver. Doesn't look like it would take a 'lot'
> > to drag that one into the modern age, but if no one has hardware to
> > test...
>
> ad7816 is obsolete;
> but the driver supports ad7817 & ad8718, which are still in production;

Ah fair enough. I'd missed that.

>
> >
> > ad7280a needs events interface bringing up to date and there are a few
> > bits of custom ABI that need documenting and might need slighty tweaking.
> > Looks easy enough so I'll cross my fingers you or one of the Analog team
> > can get that one sorted in near future ;)
>
> [no promises about dates]
> would ad7280a be better suited for hwmon/pmbus?
> the datasheet mentions it as a Lithium Ion Battery Monitoring System
>
>
> i'm asking now, as this may be a question that could pop-up later;

Probably not. The thing is, when it says Lithium Ion Battery monitoring,
it's talking for electric cars not laptops. The total voltage range supported
by this in a stack of cells is enormous.

It was a long time back but I think we had that exact discussion when it
was originally posted.

>
> >
> > Thanks,
> >
> > Jonathan
> >
> > > Thanks,
> > >
> > > Jonathan
> > >
> > > > ---
> > > > MAINTAINERS | 8 +
> > > > drivers/iio/adc/Kconfig | 12 +
> > > > drivers/iio/adc/Makefile | 1 +
> > > > drivers/iio/adc/ad7192.c | 1043 ++++++++++++++++++++++++++++++
> > > > drivers/staging/iio/adc/Kconfig | 12 -
> > > > drivers/staging/iio/adc/Makefile | 1 -
> > > > drivers/staging/iio/adc/ad7192.c | 1043 ------------------------------
> > > > 7 files changed, 1064 insertions(+), 1056 deletions(-)
> > > > create mode 100644 drivers/iio/adc/ad7192.c
> > > > delete mode 100644 drivers/staging/iio/adc/ad7192.c
> > > >
> > > > diff --git a/MAINTAINERS b/MAINTAINERS
> > > > index e699fe378e71..c82bdb31e2fb 100644
> > > > --- a/MAINTAINERS
> > > > +++ b/MAINTAINERS
> > > > @@ -922,6 +922,14 @@ S: Supported
> > > > F: drivers/iio/adc/ad7124.c
> > > > F: Documentation/devicetree/bindings/iio/adc/adi,ad7124.yaml
> > > >
> > > > +ANALOG DEVICES INC AD7192 DRIVER
> > > > +M: Alexandru Tachici <[email protected]>
> > > > +L: [email protected]
> > > > +W: http://ez.analog.com/community/linux-device-drivers
> > > > +S: Supported
> > > > +F: drivers/iio/adc/ad7192.c
> > > > +F: Documentation/devicetree/bindings/iio/adc/adi,ad7192.yaml
> > > > +
> > > > ANALOG DEVICES INC AD7292 DRIVER
> > > > M: Marcelo Schmitt <[email protected]>
> > > > L: [email protected]
> > > > diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> > > > index 82e33082958c..f4da821c4022 100644
> > > > --- a/drivers/iio/adc/Kconfig
> > > > +++ b/drivers/iio/adc/Kconfig
> > > > @@ -39,6 +39,18 @@ config AD7124
> > > > To compile this driver as a module, choose M here: the module will be
> > > > called ad7124.
> > > >
> > > > +config AD7192
> > > > + tristate "Analog Devices AD7190 AD7192 AD7193 AD7195 ADC driver"
> > > > + depends on SPI
> > > > + select AD_SIGMA_DELTA
> > > > + help
> > > > + Say yes here to build support for Analog Devices AD7190,
> > > > + AD7192, AD7193 or AD7195 SPI analog to digital converters (ADC).
> > > > + If unsure, say N (but it's safe to say "Y").
> > > > +
> > > > + To compile this driver as a module, choose M here: the
> > > > + module will be called ad7192.
> > > > +
> > > > config AD7266
> > > > tristate "Analog Devices AD7265/AD7266 ADC driver"
> > > > depends on SPI_MASTER
> > > > diff --git a/drivers/iio/adc/Makefile b/drivers/iio/adc/Makefile
> > > > index 919228900df9..8462455b4228 100644
> > > > --- a/drivers/iio/adc/Makefile
> > > > +++ b/drivers/iio/adc/Makefile
> > > > @@ -8,6 +8,7 @@ obj-$(CONFIG_AB8500_GPADC) += ab8500-gpadc.o
> > > > obj-$(CONFIG_AD_SIGMA_DELTA) += ad_sigma_delta.o
> > > > obj-$(CONFIG_AD7091R5) += ad7091r5.o ad7091r-base.o
> > > > obj-$(CONFIG_AD7124) += ad7124.o
> > > > +obj-$(CONFIG_AD7192) += ad7192.o
> > > > obj-$(CONFIG_AD7266) += ad7266.o
> > > > obj-$(CONFIG_AD7291) += ad7291.o
> > > > obj-$(CONFIG_AD7292) += ad7292.o
> > > > diff --git a/drivers/iio/adc/ad7192.c b/drivers/iio/adc/ad7192.c
> > > > new file mode 100644
> > > > index 000000000000..e75d808a2f41
> > > > --- /dev/null
> > > > +++ b/drivers/iio/adc/ad7192.c
> > > > @@ -0,0 +1,1043 @@
> > > > +// SPDX-License-Identifier: GPL-2.0
> > > > +/*
> > > > + * AD7190 AD7192 AD7193 AD7195 SPI ADC driver
> > > > + *
> > > > + * Copyright 2011-2015 Analog Devices Inc.
> > > > + */
> > > > +
> > > > +#include <linux/interrupt.h>
> > > > +#include <linux/clk.h>
> > > > +#include <linux/device.h>
> > > > +#include <linux/kernel.h>
> > > > +#include <linux/slab.h>
> > > > +#include <linux/sysfs.h>
> > > > +#include <linux/spi/spi.h>
> > > > +#include <linux/regulator/consumer.h>
> > > > +#include <linux/err.h>
> > > > +#include <linux/sched.h>
> > > > +#include <linux/delay.h>
> > > > +#include <linux/of_device.h>
> > > > +
> > > > +#include <linux/iio/iio.h>
> > > > +#include <linux/iio/sysfs.h>
> > > > +#include <linux/iio/buffer.h>
> > > > +#include <linux/iio/trigger.h>
> > > > +#include <linux/iio/trigger_consumer.h>
> > > > +#include <linux/iio/triggered_buffer.h>
> > > > +#include <linux/iio/adc/ad_sigma_delta.h>
> > > > +
> > > > +/* Registers */
> > > > +#define AD7192_REG_COMM 0 /* Communications Register (WO, 8-bit)
> > > > */
> > > > +#define AD7192_REG_STAT 0 /* Status Register (RO, 8-bit)
> > > > */
> > > > +#define AD7192_REG_MODE 1 /* Mode Register (RW, 24-bit
> > > > */
> > > > +#define AD7192_REG_CONF 2 /* Configuration Register (RW, 24-
> > > > bit) */
> > > > +#define AD7192_REG_DATA 3 /* Data Register (RO, 24/32-
> > > > bit) */
> > > > +#define AD7192_REG_ID 4 /* ID Register (RO, 8-bit)
> > > > */
> > > > +#define AD7192_REG_GPOCON 5 /* GPOCON Register (RO, 8-bit)
> > > > */
> > > > +#define AD7192_REG_OFFSET 6 /* Offset Register (RW, 16-bit
> > > > */
> > > > + /* (AD7792)/24-bit (AD7192)) */
> > > > +#define AD7192_REG_FULLSALE 7 /* Full-Scale Register */
> > > > + /* (RW, 16-bit (AD7792)/24-bit (AD7192)) */
> > > > +
> > > > +/* Communications Register Bit Designations (AD7192_REG_COMM) */
> > > > +#define AD7192_COMM_WEN BIT(7) /* Write Enable */
> > > > +#define AD7192_COMM_WRITE 0 /* Write Operation */
> > > > +#define AD7192_COMM_READ BIT(6) /* Read Operation */
> > > > +#define AD7192_COMM_ADDR(x) (((x) & 0x7) << 3) /* Register Address
> > > > */
> > > > +#define AD7192_COMM_CREAD BIT(2) /* Continuous Read of Data
> > > > Register */
> > > > +
> > > > +/* Status Register Bit Designations (AD7192_REG_STAT) */
> > > > +#define AD7192_STAT_RDY BIT(7) /* Ready */
> > > > +#define AD7192_STAT_ERR BIT(6) /* Error (Overrange, Underrange)
> > > > */
> > > > +#define AD7192_STAT_NOREF BIT(5) /* Error no external reference */
> > > > +#define AD7192_STAT_PARITY BIT(4) /* Parity */
> > > > +#define AD7192_STAT_CH3 BIT(2) /* Channel 3 */
> > > > +#define AD7192_STAT_CH2 BIT(1) /* Channel 2 */
> > > > +#define AD7192_STAT_CH1 BIT(0) /* Channel 1 */
> > > > +
> > > > +/* Mode Register Bit Designations (AD7192_REG_MODE) */
> > > > +#define AD7192_MODE_SEL(x) (((x) & 0x7) << 21) /* Operation Mode
> > > > Select */
> > > > +#define AD7192_MODE_SEL_MASK (0x7 << 21) /* Operation Mode Select
> > > > Mask */
> > > > +#define AD7192_MODE_DAT_STA BIT(20) /* Status Register transmission
> > > > */
> > > > +#define AD7192_MODE_CLKSRC(x) (((x) & 0x3) << 18) /* Clock Source
> > > > Select */
> > > > +#define AD7192_MODE_SINC3 BIT(15) /* SINC3 Filter Select */
> > > > +#define AD7192_MODE_ACX BIT(14) /* AC excitation enable(AD7195
> > > > only)*/
> > > > +#define AD7192_MODE_ENPAR BIT(13) /* Parity Enable */
> > > > +#define AD7192_MODE_CLKDIV BIT(12) /* Clock divide by 2 (AD7190/2
> > > > only)*/
> > > > +#define AD7192_MODE_SCYCLE BIT(11) /* Single cycle conversion */
> > > > +#define AD7192_MODE_REJ60 BIT(10) /* 50/60Hz notch filter */
> > > > +#define AD7192_MODE_RATE(x) ((x) & 0x3FF) /* Filter Update Rate
> > > > Select */
> > > > +
> > > > +/* Mode Register: AD7192_MODE_SEL options */
> > > > +#define AD7192_MODE_CONT 0 /* Continuous Conversion Mode */
> > > > +#define AD7192_MODE_SINGLE 1 /* Single Conversion Mode */
> > > > +#define AD7192_MODE_IDLE 2 /* Idle Mode */
> > > > +#define AD7192_MODE_PWRDN 3 /* Power-Down Mode */
> > > > +#define AD7192_MODE_CAL_INT_ZERO 4 /* Internal Zero-Scale Calibration */
> > > > +#define AD7192_MODE_CAL_INT_FULL 5 /* Internal Full-Scale Calibration */
> > > > +#define AD7192_MODE_CAL_SYS_ZERO 6 /* System Zero-Scale Calibration */
> > > > +#define AD7192_MODE_CAL_SYS_FULL 7 /* System Full-Scale Calibration */
> > > > +
> > > > +/* Mode Register: AD7192_MODE_CLKSRC options */
> > > > +#define AD7192_CLK_EXT_MCLK1_2 0 /* External 4.92 MHz Clock
> > > > connected*/
> > > > + /* from MCLK1 to MCLK2 */
> > > > +#define AD7192_CLK_EXT_MCLK2 1 /* External Clock applied to
> > > > MCLK2 */
> > > > +#define AD7192_CLK_INT 2 /* Internal 4.92 MHz Clock not
> > > > */
> > > > + /* available at the MCLK2 pin */
> > > > +#define AD7192_CLK_INT_CO 3 /* Internal 4.92 MHz Clock
> > > > available*/
> > > > + /* at the MCLK2 pin */
> > > > +
> > > > +/* Configuration Register Bit Designations (AD7192_REG_CONF) */
> > > > +
> > > > +#define AD7192_CONF_CHOP BIT(23) /* CHOP enable */
> > > > +#define AD7192_CONF_REFSEL BIT(20) /* REFIN1/REFIN2 Reference
> > > > Select */
> > > > +#define AD7192_CONF_CHAN(x) ((x) << 8) /* Channel select */
> > > > +#define AD7192_CONF_CHAN_MASK (0x7FF << 8) /* Channel select mask */
> > > > +#define AD7192_CONF_BURN BIT(7) /* Burnout current enable */
> > > > +#define AD7192_CONF_REFDET BIT(6) /* Reference detect enable */
> > > > +#define AD7192_CONF_BUF BIT(4) /* Buffered Mode Enable */
> > > > +#define AD7192_CONF_UNIPOLAR BIT(3) /* Unipolar/Bipolar Enable */
> > > > +#define AD7192_CONF_GAIN(x) ((x) & 0x7) /* Gain Select */
> > > > +
> > > > +#define AD7192_CH_AIN1P_AIN2M BIT(0) /* AIN1(+) - AIN2(-) */
> > > > +#define AD7192_CH_AIN3P_AIN4M BIT(1) /* AIN3(+) - AIN4(-) */
> > > > +#define AD7192_CH_TEMP BIT(2) /* Temp Sensor */
> > > > +#define AD7192_CH_AIN2P_AIN2M BIT(3) /* AIN2(+) - AIN2(-) */
> > > > +#define AD7192_CH_AIN1 BIT(4) /* AIN1 - AINCOM */
> > > > +#define AD7192_CH_AIN2 BIT(5) /* AIN2 - AINCOM */
> > > > +#define AD7192_CH_AIN3 BIT(6) /* AIN3 - AINCOM */
> > > > +#define AD7192_CH_AIN4 BIT(7) /* AIN4 - AINCOM */
> > > > +
> > > > +#define AD7193_CH_AIN1P_AIN2M 0x001 /* AIN1(+) - AIN2(-) */
> > > > +#define AD7193_CH_AIN3P_AIN4M 0x002 /* AIN3(+) - AIN4(-) */
> > > > +#define AD7193_CH_AIN5P_AIN6M 0x004 /* AIN5(+) - AIN6(-) */
> > > > +#define AD7193_CH_AIN7P_AIN8M 0x008 /* AIN7(+) - AIN8(-) */
> > > > +#define AD7193_CH_TEMP 0x100 /* Temp senseor */
> > > > +#define AD7193_CH_AIN2P_AIN2M 0x200 /* AIN2(+) - AIN2(-) */
> > > > +#define AD7193_CH_AIN1 0x401 /* AIN1 - AINCOM */
> > > > +#define AD7193_CH_AIN2 0x402 /* AIN2 - AINCOM */
> > > > +#define AD7193_CH_AIN3 0x404 /* AIN3 - AINCOM */
> > > > +#define AD7193_CH_AIN4 0x408 /* AIN4 - AINCOM */
> > > > +#define AD7193_CH_AIN5 0x410 /* AIN5 - AINCOM */
> > > > +#define AD7193_CH_AIN6 0x420 /* AIN6 - AINCOM */
> > > > +#define AD7193_CH_AIN7 0x440 /* AIN7 - AINCOM */
> > > > +#define AD7193_CH_AIN8 0x480 /* AIN7 - AINCOM */
> > > > +#define AD7193_CH_AINCOM 0x600 /* AINCOM - AINCOM */
> > > > +
> > > > +/* ID Register Bit Designations (AD7192_REG_ID) */
> > > > +#define ID_AD7190 0x4
> > > > +#define ID_AD7192 0x0
> > > > +#define ID_AD7193 0x2
> > > > +#define ID_AD7195 0x6
> > > > +#define AD7192_ID_MASK 0x0F
> > > > +
> > > > +/* GPOCON Register Bit Designations (AD7192_REG_GPOCON) */
> > > > +#define AD7192_GPOCON_BPDSW BIT(6) /* Bridge power-down switch
> > > > enable */
> > > > +#define AD7192_GPOCON_GP32EN BIT(5) /* Digital Output P3 and P2
> > > > enable */
> > > > +#define AD7192_GPOCON_GP10EN BIT(4) /* Digital Output P1 and P0
> > > > enable */
> > > > +#define AD7192_GPOCON_P3DAT BIT(3) /* P3 state */
> > > > +#define AD7192_GPOCON_P2DAT BIT(2) /* P2 state */
> > > > +#define AD7192_GPOCON_P1DAT BIT(1) /* P1 state */
> > > > +#define AD7192_GPOCON_P0DAT BIT(0) /* P0 state */
> > > > +
> > > > +#define AD7192_EXT_FREQ_MHZ_MIN 2457600
> > > > +#define AD7192_EXT_FREQ_MHZ_MAX 5120000
> > > > +#define AD7192_INT_FREQ_MHZ 4915200
> > > > +
> > > > +#define AD7192_NO_SYNC_FILTER 1
> > > > +#define AD7192_SYNC3_FILTER 3
> > > > +#define AD7192_SYNC4_FILTER 4
> > > > +
> > > > +/* NOTE:
> > > > + * The AD7190/2/5 features a dual use data out ready DOUT/RDY output.
> > > > + * In order to avoid contentions on the SPI bus, it's therefore necessary
> > > > + * to use spi bus locking.
> > > > + *
> > > > + * The DOUT/RDY output must also be wired to an interrupt capable GPIO.
> > > > + */
> > > > +
> > > > +enum {
> > > > + AD7192_SYSCALIB_ZERO_SCALE,
> > > > + AD7192_SYSCALIB_FULL_SCALE,
> > > > +};
> > > > +
> > > > +struct ad7192_state {
> > > > + struct regulator *avdd;
> > > > + struct regulator *dvdd;
> > > > + struct clk *mclk;
> > > > + u16 int_vref_mv;
> > > > + u32 fclk;
> > > > + u32 f_order;
> > > > + u32 mode;
> > > > + u32 conf;
> > > > + u32 scale_avail[8][2];
> > > > + u8 gpocon;
> > > > + u8 devid;
> > > > + u8 clock_sel;
> > > > + struct mutex lock; /* protect sensor state */
> > > > + u8 syscalib_mode[8];
> > > > +
> > > > + struct ad_sigma_delta sd;
> > > > +};
> > > > +
> > > > +static const char * const ad7192_syscalib_modes[] = {
> > > > + [AD7192_SYSCALIB_ZERO_SCALE] = "zero_scale",
> > > > + [AD7192_SYSCALIB_FULL_SCALE] = "full_scale",
> > > > +};
> > > > +
> > > > +static int ad7192_set_syscalib_mode(struct iio_dev *indio_dev,
> > > > + const struct iio_chan_spec *chan,
> > > > + unsigned int mode)
> > > > +{
> > > > + struct ad7192_state *st = iio_priv(indio_dev);
> > > > +
> > > > + st->syscalib_mode[chan->channel] = mode;
> > > > +
> > > > + return 0;
> > > > +}
> > > > +
> > > > +static int ad7192_get_syscalib_mode(struct iio_dev *indio_dev,
> > > > + const struct iio_chan_spec *chan)
> > > > +{
> > > > + struct ad7192_state *st = iio_priv(indio_dev);
> > > > +
> > > > + return st->syscalib_mode[chan->channel];
> > > > +}
> > > > +
> > > > +static ssize_t ad7192_write_syscalib(struct iio_dev *indio_dev,
> > > > + uintptr_t private,
> > > > + const struct iio_chan_spec *chan,
> > > > + const char *buf, size_t len)
> > > > +{
> > > > + struct ad7192_state *st = iio_priv(indio_dev);
> > > > + bool sys_calib;
> > > > + int ret, temp;
> > > > +
> > > > + ret = strtobool(buf, &sys_calib);
> > > > + if (ret)
> > > > + return ret;
> > > > +
> > > > + temp = st->syscalib_mode[chan->channel];
> > > > + if (sys_calib) {
> > > > + if (temp == AD7192_SYSCALIB_ZERO_SCALE)
> > > > + ret = ad_sd_calibrate(&st->sd, AD7192_MODE_CAL_SYS_ZERO,
> > > > + chan->address);
> > > > + else
> > > > + ret = ad_sd_calibrate(&st->sd, AD7192_MODE_CAL_SYS_FULL,
> > > > + chan->address);
> > > > + }
> > > > +
> > > > + return ret ? ret : len;
> > > > +}
> > > > +
> > > > +static const struct iio_enum ad7192_syscalib_mode_enum = {
> > > > + .items = ad7192_syscalib_modes,
> > > > + .num_items = ARRAY_SIZE(ad7192_syscalib_modes),
> > > > + .set = ad7192_set_syscalib_mode,
> > > > + .get = ad7192_get_syscalib_mode
> > > > +};
> > > > +
> > > > +static const struct iio_chan_spec_ext_info ad7192_calibsys_ext_info[] = {
> > > > + {
> > > > + .name = "sys_calibration",
> > > > + .write = ad7192_write_syscalib,
> > > > + .shared = IIO_SEPARATE,
> > > > + },
> > > > + IIO_ENUM("sys_calibration_mode", IIO_SEPARATE,
> > > > + &ad7192_syscalib_mode_enum),
> > > > + IIO_ENUM_AVAILABLE("sys_calibration_mode", &ad7192_syscalib_mode_enum),
> > > > + {}
> > > > +};
> > > > +
> > > > +static struct ad7192_state *ad_sigma_delta_to_ad7192(struct
> > > > ad_sigma_delta *sd)
> > > > +{
> > > > + return container_of(sd, struct ad7192_state, sd);
> > > > +}
> > > > +
> > > > +static int ad7192_set_channel(struct ad_sigma_delta *sd, unsigned int
> > > > channel)
> > > > +{
> > > > + struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd);
> > > > +
> > > > + st->conf &= ~AD7192_CONF_CHAN_MASK;
> > > > + st->conf |= AD7192_CONF_CHAN(channel);
> > > > +
> > > > + return ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf);
> > > > +}
> > > > +
> > > > +static int ad7192_set_mode(struct ad_sigma_delta *sd,
> > > > + enum ad_sigma_delta_mode mode)
> > > > +{
> > > > + struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd);
> > > > +
> > > > + st->mode &= ~AD7192_MODE_SEL_MASK;
> > > > + st->mode |= AD7192_MODE_SEL(mode);
> > > > +
> > > > + return ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
> > > > +}
> > > > +
> > > > +static const struct ad_sigma_delta_info ad7192_sigma_delta_info = {
> > > > + .set_channel = ad7192_set_channel,
> > > > + .set_mode = ad7192_set_mode,
> > > > + .has_registers = true,
> > > > + .addr_shift = 3,
> > > > + .read_mask = BIT(6),
> > > > +};
> > > > +
> > > > +static const struct ad_sd_calib_data ad7192_calib_arr[8] = {
> > > > + {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN1},
> > > > + {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN1},
> > > > + {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN2},
> > > > + {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN2},
> > > > + {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN3},
> > > > + {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN3},
> > > > + {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN4},
> > > > + {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN4}
> > > > +};
> > > > +
> > > > +static int ad7192_calibrate_all(struct ad7192_state *st)
> > > > +{
> > > > + return ad_sd_calibrate_all(&st->sd, ad7192_calib_arr,
> > > > + ARRAY_SIZE(ad7192_calib_arr));
> > > > +}
> > > > +
> > > > +static inline bool ad7192_valid_external_frequency(u32 freq)
> > > > +{
> > > > + return (freq >= AD7192_EXT_FREQ_MHZ_MIN &&
> > > > + freq <= AD7192_EXT_FREQ_MHZ_MAX);
> > > > +}
> > > > +
> > > > +static int ad7192_of_clock_select(struct ad7192_state *st)
> > > > +{
> > > > + struct device_node *np = st->sd.spi->dev.of_node;
> > > > + unsigned int clock_sel;
> > > > +
> > > > + clock_sel = AD7192_CLK_INT;
> > > > +
> > > > + /* use internal clock */
> > > > + if (PTR_ERR(st->mclk) == -ENOENT) {
> > > > + if (of_property_read_bool(np, "adi,int-clock-output-enable"))
> > > > + clock_sel = AD7192_CLK_INT_CO;
> > > > + } else {
> > > > + if (of_property_read_bool(np, "adi,clock-xtal"))
> > > > + clock_sel = AD7192_CLK_EXT_MCLK1_2;
> > > > + else
> > > > + clock_sel = AD7192_CLK_EXT_MCLK2;
> > > > + }
> > > > +
> > > > + return clock_sel;
> > > > +}
> > > > +
> > > > +static int ad7192_setup(struct ad7192_state *st, struct device_node *np)
> > > > +{
> > > > + struct iio_dev *indio_dev = spi_get_drvdata(st->sd.spi);
> > > > + bool rej60_en, refin2_en;
> > > > + bool buf_en, bipolar, burnout_curr_en;
> > > > + unsigned long long scale_uv;
> > > > + int i, ret, id;
> > > > +
> > > > + /* reset the serial interface */
> > > > + ret = ad_sd_reset(&st->sd, 48);
> > > > + if (ret < 0)
> > > > + return ret;
> > > > + usleep_range(500, 1000); /* Wait for at least 500us */
> > > > +
> > > > + /* write/read test for device presence */
> > > > + ret = ad_sd_read_reg(&st->sd, AD7192_REG_ID, 1, &id);
> > > > + if (ret)
> > > > + return ret;
> > > > +
> > > > + id &= AD7192_ID_MASK;
> > > > +
> > > > + if (id != st->devid)
> > > > + dev_warn(&st->sd.spi->dev, "device ID query failed (0x%X)\n",
> > > > + id);
> > > > +
> > > > + st->mode = AD7192_MODE_SEL(AD7192_MODE_IDLE) |
> > > > + AD7192_MODE_CLKSRC(st->clock_sel) |
> > > > + AD7192_MODE_RATE(480);
> > > > +
> > > > + st->conf = AD7192_CONF_GAIN(0);
> > > > +
> > > > + rej60_en = of_property_read_bool(np, "adi,rejection-60-Hz-enable");
> > > > + if (rej60_en)
> > > > + st->mode |= AD7192_MODE_REJ60;
> > > > +
> > > > + refin2_en = of_property_read_bool(np, "adi,refin2-pins-enable");
> > > > + if (refin2_en && st->devid != ID_AD7195)
> > > > + st->conf |= AD7192_CONF_REFSEL;
> > > > +
> > > > + st->conf &= ~AD7192_CONF_CHOP;
> > > > + st->f_order = AD7192_NO_SYNC_FILTER;
> > > > +
> > > > + buf_en = of_property_read_bool(np, "adi,buffer-enable");
> > > > + if (buf_en)
> > > > + st->conf |= AD7192_CONF_BUF;
> > > > +
> > > > + bipolar = of_property_read_bool(np, "bipolar");
> > > > + if (!bipolar)
> > > > + st->conf |= AD7192_CONF_UNIPOLAR;
> > > > +
> > > > + burnout_curr_en = of_property_read_bool(np,
> > > > + "adi,burnout-currents-enable");
> > > > + if (burnout_curr_en && buf_en) {
> > > > + st->conf |= AD7192_CONF_BURN;
> > > > + } else if (burnout_curr_en) {
> > > > + dev_warn(&st->sd.spi->dev,
> > > > + "Can't enable burnout currents: see CHOP or buffer\n");
> > > > + }
> > > > +
> > > > + ret = ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
> > > > + if (ret)
> > > > + return ret;
> > > > +
> > > > + ret = ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf);
> > > > + if (ret)
> > > > + return ret;
> > > > +
> > > > + ret = ad7192_calibrate_all(st);
> > > > + if (ret)
> > > > + return ret;
> > > > +
> > > > + /* Populate available ADC input ranges */
> > > > + for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) {
> > > > + scale_uv = ((u64)st->int_vref_mv * 100000000)
> > > > + >> (indio_dev->channels[0].scan_type.realbits -
> > > > + ((st->conf & AD7192_CONF_UNIPOLAR) ? 0 : 1));
> > > > + scale_uv >>= i;
> > > > +
> > > > + st->scale_avail[i][1] = do_div(scale_uv, 100000000) * 10;
> > > > + st->scale_avail[i][0] = scale_uv;
> > > > + }
> > > > +
> > > > + return 0;
> > > > +}
> > > > +
> > > > +static ssize_t ad7192_show_ac_excitation(struct device *dev,
> > > > + struct device_attribute *attr,
> > > > + char *buf)
> > > > +{
> > > > + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> > > > + struct ad7192_state *st = iio_priv(indio_dev);
> > > > +
> > > > + return sprintf(buf, "%d\n", !!(st->mode & AD7192_MODE_ACX));
> > > > +}
> > > > +
> > > > +static ssize_t ad7192_show_bridge_switch(struct device *dev,
> > > > + struct device_attribute *attr,
> > > > + char *buf)
> > > > +{
> > > > + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> > > > + struct ad7192_state *st = iio_priv(indio_dev);
> > > > +
> > > > + return sprintf(buf, "%d\n", !!(st->gpocon & AD7192_GPOCON_BPDSW));
> > > > +}
> > > > +
> > > > +static ssize_t ad7192_set(struct device *dev,
> > > > + struct device_attribute *attr,
> > > > + const char *buf,
> > > > + size_t len)
> > > > +{
> > > > + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> > > > + struct ad7192_state *st = iio_priv(indio_dev);
> > > > + struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
> > > > + int ret;
> > > > + bool val;
> > > > +
> > > > + ret = strtobool(buf, &val);
> > > > + if (ret < 0)
> > > > + return ret;
> > > > +
> > > > + ret = iio_device_claim_direct_mode(indio_dev);
> > > > + if (ret)
> > > > + return ret;
> > > > +
> > > > + switch ((u32)this_attr->address) {
> > > > + case AD7192_REG_GPOCON:
> > > > + if (val)
> > > > + st->gpocon |= AD7192_GPOCON_BPDSW;
> > > > + else
> > > > + st->gpocon &= ~AD7192_GPOCON_BPDSW;
> > > > +
> > > > + ad_sd_write_reg(&st->sd, AD7192_REG_GPOCON, 1, st->gpocon);
> > > > + break;
> > > > + case AD7192_REG_MODE:
> > > > + if (val)
> > > > + st->mode |= AD7192_MODE_ACX;
> > > > + else
> > > > + st->mode &= ~AD7192_MODE_ACX;
> > > > +
> > > > + ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
> > > > + break;
> > > > + default:
> > > > + ret = -EINVAL;
> > > > + }
> > > > +
> > > > + iio_device_release_direct_mode(indio_dev);
> > > > +
> > > > + return ret ? ret : len;
> > > > +}
> > > > +
> > > > +static void ad7192_get_available_filter_freq(struct ad7192_state *st,
> > > > + int *freq)
> > > > +{
> > > > + unsigned int fadc;
> > > > +
> > > > + /* Formulas for filter at page 25 of the datasheet */
> > > > + fadc = DIV_ROUND_CLOSEST(st->fclk,
> > > > + AD7192_SYNC4_FILTER * AD7192_MODE_RATE(st-
> > > > >mode));
> > > > + freq[0] = DIV_ROUND_CLOSEST(fadc * 240, 1024);
> > > > +
> > > > + fadc = DIV_ROUND_CLOSEST(st->fclk,
> > > > + AD7192_SYNC3_FILTER * AD7192_MODE_RATE(st-
> > > > >mode));
> > > > + freq[1] = DIV_ROUND_CLOSEST(fadc * 240, 1024);
> > > > +
> > > > + fadc = DIV_ROUND_CLOSEST(st->fclk, AD7192_MODE_RATE(st->mode));
> > > > + freq[2] = DIV_ROUND_CLOSEST(fadc * 230, 1024);
> > > > + freq[3] = DIV_ROUND_CLOSEST(fadc * 272, 1024);
> > > > +}
> > > > +
> > > > +static ssize_t ad7192_show_filter_avail(struct device *dev,
> > > > + struct device_attribute *attr,
> > > > + char *buf)
> > > > +{
> > > > + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> > > > + struct ad7192_state *st = iio_priv(indio_dev);
> > > > + unsigned int freq_avail[4], i;
> > > > + size_t len = 0;
> > > > +
> > > > + ad7192_get_available_filter_freq(st, freq_avail);
> > > > +
> > > > + for (i = 0; i < ARRAY_SIZE(freq_avail); i++)
> > > > + len += scnprintf(buf + len, PAGE_SIZE - len,
> > > > + "%d.%d ", freq_avail[i] / 1000,
> > > > + freq_avail[i] % 1000);
> > > > +
> > > > + buf[len - 1] = '\n';
> > > > +
> > > > + return len;
> > > > +}
> > > > +
> > > > +static IIO_DEVICE_ATTR(filter_low_pass_3db_frequency_available,
> > > > + 0444, ad7192_show_filter_avail, NULL, 0);
> > > > +
> > > > +static IIO_DEVICE_ATTR(bridge_switch_en, 0644,
> > > > + ad7192_show_bridge_switch, ad7192_set,
> > > > + AD7192_REG_GPOCON);
> > > > +
> > > > +static IIO_DEVICE_ATTR(ac_excitation_en, 0644,
> > > > + ad7192_show_ac_excitation, ad7192_set,
> > > > + AD7192_REG_MODE);
> > > > +
> > > > +static struct attribute *ad7192_attributes[] = {
> > > > + &iio_dev_attr_filter_low_pass_3db_frequency_available.dev_attr.attr,
> > > > + &iio_dev_attr_bridge_switch_en.dev_attr.attr,
> > > > + &iio_dev_attr_ac_excitation_en.dev_attr.attr,
> > > > + NULL
> > > > +};
> > > > +
> > > > +static const struct attribute_group ad7192_attribute_group = {
> > > > + .attrs = ad7192_attributes,
> > > > +};
> > > > +
> > > > +static struct attribute *ad7195_attributes[] = {
> > > > + &iio_dev_attr_filter_low_pass_3db_frequency_available.dev_attr.attr,
> > > > + &iio_dev_attr_bridge_switch_en.dev_attr.attr,
> > > > + NULL
> > > > +};
> > > > +
> > > > +static const struct attribute_group ad7195_attribute_group = {
> > > > + .attrs = ad7195_attributes,
> > > > +};
> > > > +
> > > > +static unsigned int ad7192_get_temp_scale(bool unipolar)
> > > > +{
> > > > + return unipolar ? 2815 * 2 : 2815;
> > > > +}
> > > > +
> > > > +static int ad7192_set_3db_filter_freq(struct ad7192_state *st,
> > > > + int val, int val2)
> > > > +{
> > > > + int freq_avail[4], i, ret, freq;
> > > > + unsigned int diff_new, diff_old;
> > > > + int idx = 0;
> > > > +
> > > > + diff_old = U32_MAX;
> > > > + freq = val * 1000 + val2;
> > > > +
> > > > + ad7192_get_available_filter_freq(st, freq_avail);
> > > > +
> > > > + for (i = 0; i < ARRAY_SIZE(freq_avail); i++) {
> > > > + diff_new = abs(freq - freq_avail[i]);
> > > > + if (diff_new < diff_old) {
> > > > + diff_old = diff_new;
> > > > + idx = i;
> > > > + }
> > > > + }
> > > > +
> > > > + switch (idx) {
> > > > + case 0:
> > > > + st->f_order = AD7192_SYNC4_FILTER;
> > > > + st->mode &= ~AD7192_MODE_SINC3;
> > > > +
> > > > + st->conf |= AD7192_CONF_CHOP;
> > > > + break;
> > > > + case 1:
> > > > + st->f_order = AD7192_SYNC3_FILTER;
> > > > + st->mode |= AD7192_MODE_SINC3;
> > > > +
> > > > + st->conf |= AD7192_CONF_CHOP;
> > > > + break;
> > > > + case 2:
> > > > + st->f_order = AD7192_NO_SYNC_FILTER;
> > > > + st->mode &= ~AD7192_MODE_SINC3;
> > > > +
> > > > + st->conf &= ~AD7192_CONF_CHOP;
> > > > + break;
> > > > + case 3:
> > > > + st->f_order = AD7192_NO_SYNC_FILTER;
> > > > + st->mode |= AD7192_MODE_SINC3;
> > > > +
> > > > + st->conf &= ~AD7192_CONF_CHOP;
> > > > + break;
> > > > + }
> > > > +
> > > > + ret = ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
> > > > + if (ret < 0)
> > > > + return ret;
> > > > +
> > > > + return ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf);
> > > > +}
> > > > +
> > > > +static int ad7192_get_3db_filter_freq(struct ad7192_state *st)
> > > > +{
> > > > + unsigned int fadc;
> > > > +
> > > > + fadc = DIV_ROUND_CLOSEST(st->fclk,
> > > > + st->f_order * AD7192_MODE_RATE(st->mode));
> > > > +
> > > > + if (st->conf & AD7192_CONF_CHOP)
> > > > + return DIV_ROUND_CLOSEST(fadc * 240, 1024);
> > > > + if (st->mode & AD7192_MODE_SINC3)
> > > > + return DIV_ROUND_CLOSEST(fadc * 272, 1024);
> > > > + else
> > > > + return DIV_ROUND_CLOSEST(fadc * 230, 1024);
> > > > +}
> > > > +
> > > > +static int ad7192_read_raw(struct iio_dev *indio_dev,
> > > > + struct iio_chan_spec const *chan,
> > > > + int *val,
> > > > + int *val2,
> > > > + long m)
> > > > +{
> > > > + struct ad7192_state *st = iio_priv(indio_dev);
> > > > + bool unipolar = !!(st->conf & AD7192_CONF_UNIPOLAR);
> > > > +
> > > > + switch (m) {
> > > > + case IIO_CHAN_INFO_RAW:
> > > > + return ad_sigma_delta_single_conversion(indio_dev, chan, val);
> > > > + case IIO_CHAN_INFO_SCALE:
> > > > + switch (chan->type) {
> > > > + case IIO_VOLTAGE:
> > > > + mutex_lock(&st->lock);
> > > > + *val = st->scale_avail[AD7192_CONF_GAIN(st->conf)][0];
> > > > + *val2 = st->scale_avail[AD7192_CONF_GAIN(st->conf)][1];
> > > > + mutex_unlock(&st->lock);
> > > > + return IIO_VAL_INT_PLUS_NANO;
> > > > + case IIO_TEMP:
> > > > + *val = 0;
> > > > + *val2 = 1000000000 / ad7192_get_temp_scale(unipolar);
> > > > + return IIO_VAL_INT_PLUS_NANO;
> > > > + default:
> > > > + return -EINVAL;
> > > > + }
> > > > + case IIO_CHAN_INFO_OFFSET:
> > > > + if (!unipolar)
> > > > + *val = -(1 << (chan->scan_type.realbits - 1));
> > > > + else
> > > > + *val = 0;
> > > > + /* Kelvin to Celsius */
> > > > + if (chan->type == IIO_TEMP)
> > > > + *val -= 273 * ad7192_get_temp_scale(unipolar);
> > > > + return IIO_VAL_INT;
> > > > + case IIO_CHAN_INFO_SAMP_FREQ:
> > > > + *val = st->fclk /
> > > > + (st->f_order * 1024 * AD7192_MODE_RATE(st->mode));
> > > > + return IIO_VAL_INT;
> > > > + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
> > > > + *val = ad7192_get_3db_filter_freq(st);
> > > > + *val2 = 1000;
> > > > + return IIO_VAL_FRACTIONAL;
> > > > + }
> > > > +
> > > > + return -EINVAL;
> > > > +}
> > > > +
> > > > +static int ad7192_write_raw(struct iio_dev *indio_dev,
> > > > + struct iio_chan_spec const *chan,
> > > > + int val,
> > > > + int val2,
> > > > + long mask)
> > > > +{
> > > > + struct ad7192_state *st = iio_priv(indio_dev);
> > > > + int ret, i, div;
> > > > + unsigned int tmp;
> > > > +
> > > > + ret = iio_device_claim_direct_mode(indio_dev);
> > > > + if (ret)
> > > > + return ret;
> > > > +
> > > > + switch (mask) {
> > > > + case IIO_CHAN_INFO_SCALE:
> > > > + ret = -EINVAL;
> > > > + mutex_lock(&st->lock);
> > > > + for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++)
> > > > + if (val2 == st->scale_avail[i][1]) {
> > > > + ret = 0;
> > > > + tmp = st->conf;
> > > > + st->conf &= ~AD7192_CONF_GAIN(-1);
> > > > + st->conf |= AD7192_CONF_GAIN(i);
> > > > + if (tmp == st->conf)
> > > > + break;
> > > > + ad_sd_write_reg(&st->sd, AD7192_REG_CONF,
> > > > + 3, st->conf);
> > > > + ad7192_calibrate_all(st);
> > > > + break;
> > > > + }
> > > > + mutex_unlock(&st->lock);
> > > > + break;
> > > > + case IIO_CHAN_INFO_SAMP_FREQ:
> > > > + if (!val) {
> > > > + ret = -EINVAL;
> > > > + break;
> > > > + }
> > > > +
> > > > + div = st->fclk / (val * st->f_order * 1024);
> > > > + if (div < 1 || div > 1023) {
> > > > + ret = -EINVAL;
> > > > + break;
> > > > + }
> > > > +
> > > > + st->mode &= ~AD7192_MODE_RATE(-1);
> > > > + st->mode |= AD7192_MODE_RATE(div);
> > > > + ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
> > > > + break;
> > > > + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
> > > > + ret = ad7192_set_3db_filter_freq(st, val, val2 / 1000);
> > > > + break;
> > > > + default:
> > > > + ret = -EINVAL;
> > > > + }
> > > > +
> > > > + iio_device_release_direct_mode(indio_dev);
> > > > +
> > > > + return ret;
> > > > +}
> > > > +
> > > > +static int ad7192_write_raw_get_fmt(struct iio_dev *indio_dev,
> > > > + struct iio_chan_spec const *chan,
> > > > + long mask)
> > > > +{
> > > > + switch (mask) {
> > > > + case IIO_CHAN_INFO_SCALE:
> > > > + return IIO_VAL_INT_PLUS_NANO;
> > > > + case IIO_CHAN_INFO_SAMP_FREQ:
> > > > + return IIO_VAL_INT;
> > > > + case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
> > > > + return IIO_VAL_INT_PLUS_MICRO;
> > > > + default:
> > > > + return -EINVAL;
> > > > + }
> > > > +}
> > > > +
> > > > +static int ad7192_read_avail(struct iio_dev *indio_dev,
> > > > + struct iio_chan_spec const *chan,
> > > > + const int **vals, int *type, int *length,
> > > > + long mask)
> > > > +{
> > > > + struct ad7192_state *st = iio_priv(indio_dev);
> > > > +
> > > > + switch (mask) {
> > > > + case IIO_CHAN_INFO_SCALE:
> > > > + *vals = (int *)st->scale_avail;
> > > > + *type = IIO_VAL_INT_PLUS_NANO;
> > > > + /* Values are stored in a 2D matrix */
> > > > + *length = ARRAY_SIZE(st->scale_avail) * 2;
> > > > +
> > > > + return IIO_AVAIL_LIST;
> > > > + }
> > > > +
> > > > + return -EINVAL;
> > > > +}
> > > > +
> > > > +static const struct iio_info ad7192_info = {
> > > > + .read_raw = ad7192_read_raw,
> > > > + .write_raw = ad7192_write_raw,
> > > > + .write_raw_get_fmt = ad7192_write_raw_get_fmt,
> > > > + .read_avail = ad7192_read_avail,
> > > > + .attrs = &ad7192_attribute_group,
> > > > + .validate_trigger = ad_sd_validate_trigger,
> > > > +};
> > > > +
> > > > +static const struct iio_info ad7195_info = {
> > > > + .read_raw = ad7192_read_raw,
> > > > + .write_raw = ad7192_write_raw,
> > > > + .write_raw_get_fmt = ad7192_write_raw_get_fmt,
> > > > + .read_avail = ad7192_read_avail,
> > > > + .attrs = &ad7195_attribute_group,
> > > > + .validate_trigger = ad_sd_validate_trigger,
> > > > +};
> > > > +
> > > > +#define __AD719x_CHANNEL(_si, _channel1, _channel2, _address,
> > > > _extend_name, \
> > > > + _type, _mask_type_av, _ext_info) \
> > > > + { \
> > > > + .type = (_type), \
> > > > + .differential = ((_channel2) == -1 ? 0 : 1), \
> > > > + .indexed = 1, \
> > > > + .channel = (_channel1), \
> > > > + .channel2 = (_channel2), \
> > > > + .address = (_address), \
> > > > + .extend_name = (_extend_name), \
> > > > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
> > > > + BIT(IIO_CHAN_INFO_OFFSET), \
> > > > + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
> > > > + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
> > > > + BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \
> > > > + .info_mask_shared_by_type_available = (_mask_type_av), \
> > > > + .ext_info = (_ext_info), \
> > > > + .scan_index = (_si), \
> > > > + .scan_type = { \
> > > > + .sign = 'u', \
> > > > + .realbits = 24, \
> > > > + .storagebits = 32, \
> > > > + .endianness = IIO_BE, \
> > > > + }, \
> > > > + }
> > > > +
> > > > +#define AD719x_DIFF_CHANNEL(_si, _channel1, _channel2, _address) \
> > > > + __AD719x_CHANNEL(_si, _channel1, _channel2, _address, NULL, \
> > > > + IIO_VOLTAGE, BIT(IIO_CHAN_INFO_SCALE), \
> > > > + ad7192_calibsys_ext_info)
> > > > +
> > > > +#define AD719x_CHANNEL(_si, _channel1, _address) \
> > > > + __AD719x_CHANNEL(_si, _channel1, -1, _address, NULL, IIO_VOLTAGE, \
> > > > + BIT(IIO_CHAN_INFO_SCALE), ad7192_calibsys_ext_info)
> > > > +
> > > > +#define AD719x_SHORTED_CHANNEL(_si, _channel1, _address) \
> > > > + __AD719x_CHANNEL(_si, _channel1, -1, _address, "shorted", IIO_VOLTAGE, \
> > > > + BIT(IIO_CHAN_INFO_SCALE), ad7192_calibsys_ext_info)
> > > > +
> > > > +#define AD719x_TEMP_CHANNEL(_si, _address) \
> > > > + __AD719x_CHANNEL(_si, 0, -1, _address, NULL, IIO_TEMP, 0, NULL)
> > > > +
> > > > +static const struct iio_chan_spec ad7192_channels[] = {
> > > > + AD719x_DIFF_CHANNEL(0, 1, 2, AD7192_CH_AIN1P_AIN2M),
> > > > + AD719x_DIFF_CHANNEL(1, 3, 4, AD7192_CH_AIN3P_AIN4M),
> > > > + AD719x_TEMP_CHANNEL(2, AD7192_CH_TEMP),
> > > > + AD719x_SHORTED_CHANNEL(3, 2, AD7192_CH_AIN2P_AIN2M),
> > > > + AD719x_CHANNEL(4, 1, AD7192_CH_AIN1),
> > > > + AD719x_CHANNEL(5, 2, AD7192_CH_AIN2),
> > > > + AD719x_CHANNEL(6, 3, AD7192_CH_AIN3),
> > > > + AD719x_CHANNEL(7, 4, AD7192_CH_AIN4),
> > > > + IIO_CHAN_SOFT_TIMESTAMP(8),
> > > > +};
> > > > +
> > > > +static const struct iio_chan_spec ad7193_channels[] = {
> > > > + AD719x_DIFF_CHANNEL(0, 1, 2, AD7193_CH_AIN1P_AIN2M),
> > > > + AD719x_DIFF_CHANNEL(1, 3, 4, AD7193_CH_AIN3P_AIN4M),
> > > > + AD719x_DIFF_CHANNEL(2, 5, 6, AD7193_CH_AIN5P_AIN6M),
> > > > + AD719x_DIFF_CHANNEL(3, 7, 8, AD7193_CH_AIN7P_AIN8M),
> > > > + AD719x_TEMP_CHANNEL(4, AD7193_CH_TEMP),
> > > > + AD719x_SHORTED_CHANNEL(5, 2, AD7193_CH_AIN2P_AIN2M),
> > > > + AD719x_CHANNEL(6, 1, AD7193_CH_AIN1),
> > > > + AD719x_CHANNEL(7, 2, AD7193_CH_AIN2),
> > > > + AD719x_CHANNEL(8, 3, AD7193_CH_AIN3),
> > > > + AD719x_CHANNEL(9, 4, AD7193_CH_AIN4),
> > > > + AD719x_CHANNEL(10, 5, AD7193_CH_AIN5),
> > > > + AD719x_CHANNEL(11, 6, AD7193_CH_AIN6),
> > > > + AD719x_CHANNEL(12, 7, AD7193_CH_AIN7),
> > > > + AD719x_CHANNEL(13, 8, AD7193_CH_AIN8),
> > > > + IIO_CHAN_SOFT_TIMESTAMP(14),
> > > > +};
> > > > +
> > > > +static int ad7192_channels_config(struct iio_dev *indio_dev)
> > > > +{
> > > > + struct ad7192_state *st = iio_priv(indio_dev);
> > > > +
> > > > + switch (st->devid) {
> > > > + case ID_AD7193:
> > > > + indio_dev->channels = ad7193_channels;
> > > > + indio_dev->num_channels = ARRAY_SIZE(ad7193_channels);
> > > > + break;
> > > > + default:
> > > > + indio_dev->channels = ad7192_channels;
> > > > + indio_dev->num_channels = ARRAY_SIZE(ad7192_channels);
> > > > + break;
> > > > + }
> > > > +
> > > > + return 0;
> > > > +}
> > > > +
> > > > +static const struct of_device_id ad7192_of_match[];
> > > > +
> > > > +static int ad7192_probe(struct spi_device *spi)
> > > > +{
> > > > + const struct of_device_id *match;
> > > > + struct ad7192_state *st;
> > > > + struct iio_dev *indio_dev;
> > > > + int ret, voltage_uv = 0;
> > > > +
> > > > + if (!spi->irq) {
> > > > + dev_err(&spi->dev, "no IRQ?\n");
> > > > + return -ENODEV;
> > > > + }
> > > > +
> > > > + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
> > > > + if (!indio_dev)
> > > > + return -ENOMEM;
> > > > +
> > > > + st = iio_priv(indio_dev);
> > > > +
> > > > + mutex_init(&st->lock);
> > > > +
> > > > + st->avdd = devm_regulator_get(&spi->dev, "avdd");
> > > > + if (IS_ERR(st->avdd))
> > > > + return PTR_ERR(st->avdd);
> > > > +
> > > > + ret = regulator_enable(st->avdd);
> > > > + if (ret) {
> > > > + dev_err(&spi->dev, "Failed to enable specified AVdd supply\n");
> > > > + return ret;
> > > > + }
> > > > +
> > > > + st->dvdd = devm_regulator_get(&spi->dev, "dvdd");
> > > > + if (IS_ERR(st->dvdd)) {
> > > > + ret = PTR_ERR(st->dvdd);
> > > > + goto error_disable_avdd;
> > > > + }
> > > > +
> > > > + ret = regulator_enable(st->dvdd);
> > > > + if (ret) {
> > > > + dev_err(&spi->dev, "Failed to enable specified DVdd supply\n");
> > > > + goto error_disable_avdd;
> > > > + }
> > > > +
> > > > + voltage_uv = regulator_get_voltage(st->avdd);
> > > > +
> > > > + if (voltage_uv) {
> > > > + st->int_vref_mv = voltage_uv / 1000;
> > > > + } else {
> > > > + ret = voltage_uv;
> > > > + dev_err(&spi->dev, "Device tree error, reference voltage
> > > > undefined\n");
> > > > + goto error_disable_avdd;
> > > > + }
> > > > +
> > > > + match = of_match_device(ad7192_of_match, &spi->dev);
> > > > + if (!match)
> > > > + return -EINVAL;
> > > > +
> > > > + spi_set_drvdata(spi, indio_dev);
> > > > + st->devid = (unsigned long)match->data;
> > > > + indio_dev->dev.parent = &spi->dev;
> > > > + indio_dev->name = spi_get_device_id(spi)->name;
> > > > + indio_dev->modes = INDIO_DIRECT_MODE;
> > > > +
> > > > + ret = ad7192_channels_config(indio_dev);
> > > > + if (ret < 0)
> > > > + goto error_disable_dvdd;
> > > > +
> > > > + if (st->devid == ID_AD7195)
> > > > + indio_dev->info = &ad7195_info;
> > > > + else
> > > > + indio_dev->info = &ad7192_info;
> > > > +
> > > > + ad_sd_init(&st->sd, indio_dev, spi, &ad7192_sigma_delta_info);
> > > > +
> > > > + ret = ad_sd_setup_buffer_and_trigger(indio_dev);
> > > > + if (ret)
> > > > + goto error_disable_dvdd;
> > > > +
> > > > + st->fclk = AD7192_INT_FREQ_MHZ;
> > > > +
> > > > + st->mclk = devm_clk_get(&st->sd.spi->dev, "mclk");
> > > > + if (IS_ERR(st->mclk) && PTR_ERR(st->mclk) != -ENOENT) {
> > > > + ret = PTR_ERR(st->mclk);
> > > > + goto error_remove_trigger;
> > > > + }
> > > > +
> > > > + st->clock_sel = ad7192_of_clock_select(st);
> > > > +
> > > > + if (st->clock_sel == AD7192_CLK_EXT_MCLK1_2 ||
> > > > + st->clock_sel == AD7192_CLK_EXT_MCLK2) {
> > > > + ret = clk_prepare_enable(st->mclk);
> > > > + if (ret < 0)
> > > > + goto error_remove_trigger;
> > > > +
> > > > + st->fclk = clk_get_rate(st->mclk);
> > > > + if (!ad7192_valid_external_frequency(st->fclk)) {
> > > > + ret = -EINVAL;
> > > > + dev_err(&spi->dev,
> > > > + "External clock frequency out of bounds\n");
> > > > + goto error_disable_clk;
> > > > + }
> > > > + }
> > > > +
> > > > + ret = ad7192_setup(st, spi->dev.of_node);
> > > > + if (ret)
> > > > + goto error_disable_clk;
> > > > +
> > > > + ret = iio_device_register(indio_dev);
> > > > + if (ret < 0)
> > > > + goto error_disable_clk;
> > > > +
> > > > + return 0;
> > > > +
> > > > +error_disable_clk:
> > > > + clk_disable_unprepare(st->mclk);
> > > > +error_remove_trigger:
> > > > + ad_sd_cleanup_buffer_and_trigger(indio_dev);
> > > > +error_disable_dvdd:
> > > > + regulator_disable(st->dvdd);
> > > > +error_disable_avdd:
> > > > + regulator_disable(st->avdd);
> > > > +
> > > > + return ret;
> > > > +}
> > > > +
> > > > +static int ad7192_remove(struct spi_device *spi)
> > > > +{
> > > > + struct iio_dev *indio_dev = spi_get_drvdata(spi);
> > > > + struct ad7192_state *st = iio_priv(indio_dev);
> > > > +
> > > > + iio_device_unregister(indio_dev);
> > > > + clk_disable_unprepare(st->mclk);
> > > > + ad_sd_cleanup_buffer_and_trigger(indio_dev);
> > > > +
> > > > + regulator_disable(st->dvdd);
> > > > + regulator_disable(st->avdd);
> > > > +
> > > > + return 0;
> > > > +}
> > > > +
> > > > +static const struct of_device_id ad7192_of_match[] = {
> > > > + { .compatible = "adi,ad7190", .data = (void *)ID_AD7190},
> > > > + { .compatible = "adi,ad7192", .data = (void *)ID_AD7192 },
> > > > + { .compatible = "adi,ad7193", .data = (void *)ID_AD7193 },
> > > > + { .compatible = "adi,ad7195", .data = (void *)ID_AD7195 },
> > > > + {}
> > > > +};
> > > > +
> > > > +MODULE_DEVICE_TABLE(of, ad7192_of_match);
> > > > +
> > > > +static struct spi_driver ad7192_driver = {
> > > > + .driver = {
> > > > + .name = "ad7192",
> > > > + .of_match_table = ad7192_of_match,
> > > > + },
> > > > + .probe = ad7192_probe,
> > > > + .remove = ad7192_remove,
> > > > +};
> > > > +module_spi_driver(ad7192_driver);
> > > > +
> > > > +MODULE_AUTHOR("Michael Hennerich <[email protected]>");
> > > > +MODULE_DESCRIPTION("Analog Devices AD7190, AD7192, AD7193, AD7195 ADC");
> > > > +MODULE_LICENSE("GPL v2");