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From:   Alexandru Tachici <alexandru.tachici@analog.com>
To:     <linux-iio@vger.kernel.org>, <linux-kernel@vger.kernel.org>
CC:     <jic23@kernel.org>,
        Alexandru Tachici <alexandru.tachici@analog.com>
Subject: [PATCH v3 5/5] staging: iio: adc: ad7192: move out of staging
Date:   Wed, 12 Feb 2020 18:17:21 +0200
Message-ID: <20200212161721.16200-6-alexandru.tachici@analog.com>
In-Reply-To: <20200212161721.16200-1-alexandru.tachici@analog.com>
References: <20200212161721.16200-1-alexandru.tachici@analog.com>
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Precedence: bulk

Move ad7192 ADC driver out of staging into mainline.

Signed-off-by: Alexandru Tachici <alexandru.tachici@analog.com>
---
 MAINTAINERS                      |    8 +
 drivers/iio/adc/Kconfig          |   12 +
 drivers/iio/adc/Makefile         |    1 +
 drivers/iio/adc/ad7192.c         | 1034 ++++++++++++++++++++++++++++++
 drivers/staging/iio/adc/Kconfig  |   12 -
 drivers/staging/iio/adc/Makefile |    1 -
 drivers/staging/iio/adc/ad7192.c | 1034 ------------------------------
 7 files changed, 1055 insertions(+), 1047 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 <alexandru.tachici@analog.com>
+L:	linux-iio@vger.kernel.org
+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 <marcelo.schmitt1@gmail.com>
 L:	linux-iio@vger.kernel.org
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..8ec28aa8fa8a
--- /dev/null
+++ b/drivers/iio/adc/ad7192.c
@@ -0,0 +1,1034 @@
+// 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[] = {
+	{ .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 int ad7192_probe(struct spi_device *spi)
+{
+	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 > 0) {
+		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;
+	}
+
+	spi_set_drvdata(spi, indio_dev);
+	st->devid = (unsigned long)of_device_get_match_data(&spi->dev);
+	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 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 <michael.hennerich@analog.com>");
+MODULE_DESCRIPTION("Analog Devices AD7190, AD7192, AD7193, AD7195 ADC");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/staging/iio/adc/Kconfig b/drivers/staging/iio/adc/Kconfig
index 31cd9a12f40f..b25f41053fac 100644
--- a/drivers/staging/iio/adc/Kconfig
+++ b/drivers/staging/iio/adc/Kconfig
@@ -15,18 +15,6 @@ config AD7816
 	  To compile this driver as a module, choose M here: the
 	  module will be called ad7816.
 
-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 AD7280
 	tristate "Analog Devices AD7280A Lithium Ion Battery Monitoring System"
 	depends on SPI
diff --git a/drivers/staging/iio/adc/Makefile b/drivers/staging/iio/adc/Makefile
index 4b76769b32bc..6436a62b6278 100644
--- a/drivers/staging/iio/adc/Makefile
+++ b/drivers/staging/iio/adc/Makefile
@@ -4,5 +4,4 @@
 #
 
 obj-$(CONFIG_AD7816) += ad7816.o
-obj-$(CONFIG_AD7192) += ad7192.o
 obj-$(CONFIG_AD7280) += ad7280a.o
diff --git a/drivers/staging/iio/adc/ad7192.c b/drivers/staging/iio/adc/ad7192.c
deleted file mode 100644
index 8ec28aa8fa8a..000000000000
--- a/drivers/staging/iio/adc/ad7192.c
+++ /dev/null
@@ -1,1034 +0,0 @@
-// 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[] = {
-	{ .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 int ad7192_probe(struct spi_device *spi)
-{
-	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 > 0) {
-		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;
-	}
-
-	spi_set_drvdata(spi, indio_dev);
-	st->devid = (unsigned long)of_device_get_match_data(&spi->dev);
-	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 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 <michael.hennerich@analog.com>");
-MODULE_DESCRIPTION("Analog Devices AD7190, AD7192, AD7193, AD7195 ADC");
-MODULE_LICENSE("GPL v2");
-- 
2.20.1