Date:   Thu, 2 Dec 2021 20:52:00 +0800
From:   Cai Huoqing <cai.huoqing@linux.dev>
To:     Antoniu Miclaus <antoniu.miclaus@analog.com>
Cc:     jic23@kernel.org, robh+dt@kernel.org, linux-iio@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 1/2] iio:dac:ad7293: add support for AD7293
Message-ID: <20211202125200.GA11548@chq-T47>
References: <20211202110139.189087-1-antoniu.miclaus@analog.com>
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In-Reply-To: <20211202110139.189087-1-antoniu.miclaus@analog.com>
Precedence: bulk

On 02 12月 21 13:01:38, Antoniu Miclaus wrote:
> The AD7293 is a Power Amplifier drain current controller
> containing functionality for general-purpose monitoring
> and control of current, voltage, and temperature, integrated
> into a single chip solution with an SPI-compatible interface.
> 
> Datasheet:
> https://www.analog.com/media/en/technical-documentation/data-sheets/AD7293.pdf
> Signed-off-by: Antoniu Miclaus <antoniu.miclaus@analog.com>
> ---
> changes in v5:
>  - perform error check for `regulator_get_voltage`
>  - more characters per line adjustments
>  drivers/iio/dac/Kconfig  |  11 +
>  drivers/iio/dac/Makefile |   1 +
>  drivers/iio/dac/ad7293.c | 909 +++++++++++++++++++++++++++++++++++++++
>  3 files changed, 921 insertions(+)
>  create mode 100644 drivers/iio/dac/ad7293.c
> 
> diff --git a/drivers/iio/dac/Kconfig b/drivers/iio/dac/Kconfig
> index 75e1f2b48638..6206b90fc08f 100644
> --- a/drivers/iio/dac/Kconfig
> +++ b/drivers/iio/dac/Kconfig
> @@ -221,6 +221,17 @@ config AD5791
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called ad5791.
>  
> +config AD7293
> +	tristate "Analog Devices AD7293 Power Amplifier Current Controller"
> +	depends on SPI
> +	help
> +	  Say yes here to build support for Analog Devices AD7293
> +	  Power Amplifier Current Controller with
> +	  ADC, DACs, and Temperature and Current Sensors
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called ad7293.
> +
>  config AD7303
>  	tristate "Analog Devices AD7303 DAC driver"
>  	depends on SPI
> diff --git a/drivers/iio/dac/Makefile b/drivers/iio/dac/Makefile
> index 33e16f14902a..3c17246ee89b 100644
> --- a/drivers/iio/dac/Makefile
> +++ b/drivers/iio/dac/Makefile
> @@ -25,6 +25,7 @@ obj-$(CONFIG_AD5791) += ad5791.o
>  obj-$(CONFIG_AD5686) += ad5686.o
>  obj-$(CONFIG_AD5686_SPI) += ad5686-spi.o
>  obj-$(CONFIG_AD5696_I2C) += ad5696-i2c.o
> +obj-$(CONFIG_AD7293) += ad7293.o
>  obj-$(CONFIG_AD7303) += ad7303.o
>  obj-$(CONFIG_AD8801) += ad8801.o
>  obj-$(CONFIG_CIO_DAC) += cio-dac.o
> diff --git a/drivers/iio/dac/ad7293.c b/drivers/iio/dac/ad7293.c
> new file mode 100644
> index 000000000000..b5770ff03258
> --- /dev/null
> +++ b/drivers/iio/dac/ad7293.c
> @@ -0,0 +1,909 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * AD7293 driver
> + *
> + * Copyright 2021 Analog Devices Inc.
> + */
> +
> +#include <linux/bitfield.h>
> +#include <linux/bits.h>
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/iio/iio.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/spi/spi.h>
> +
> +#include <asm/unaligned.h>
> +
> +#define AD7293_R1B				BIT(16)
> +#define AD7293_R2B				BIT(17)
> +#define AD7293_PAGE_ADDR_MSK			GENMASK(15, 8)
> +#define AD7293_PAGE(x)				FIELD_PREP(AD7293_PAGE_ADDR_MSK, x)
> +
> +/* AD7293 Register Map Common */
> +#define AD7293_REG_NO_OP			(AD7293_R1B | AD7293_PAGE(0x0) | 0x0)
remove unused register macro,  like this.
> +#define AD7293_REG_PAGE_SELECT			(AD7293_R1B | AD7293_PAGE(0x0) | 0x1)
> +#define AD7293_REG_CONV_CMD			(AD7293_R2B | AD7293_PAGE(0x0) | 0x2)
> +#define AD7293_REG_RESULT			(AD7293_R1B | AD7293_PAGE(0x0) | 0x3)
> +#define AD7293_REG_DAC_EN			(AD7293_R1B | AD7293_PAGE(0x0) | 0x4)
> +#define AD7293_REG_DEVICE_ID			(AD7293_R2B | AD7293_PAGE(0x0) | 0xC)
> +#define AD7293_REG_SOFT_RESET			(AD7293_R2B | AD7293_PAGE(0x0) | 0xF)
> +
> +/* AD7293 Register Map Page 0x0 */
> +#define AD7293_REG_VIN0				(AD7293_R2B | AD7293_PAGE(0x0) | 0x10)
> +#define AD7293_REG_VIN1				(AD7293_R2B | AD7293_PAGE(0x0) | 0x11)
> +#define AD7293_REG_VIN2				(AD7293_R2B | AD7293_PAGE(0x0) | 0x12)
> +#define AD7293_REG_VIN3				(AD7293_R2B | AD7293_PAGE(0x0) | 0x13)
> +#define AD7293_REG_TSENSE_INT			(AD7293_R2B | AD7293_PAGE(0x0) | 0x20)
> +#define AD7293_REG_TSENSE_D0			(AD7293_R2B | AD7293_PAGE(0x0) | 0x21)
> +#define AD7293_REG_TSENSE_D1			(AD7293_R2B | AD7293_PAGE(0x0) | 0x22)
> +#define AD7293_REG_ISENSE_0			(AD7293_R2B | AD7293_PAGE(0x0) | 0x28)
> +#define AD7293_REG_ISENSE_1			(AD7293_R2B | AD7293_PAGE(0x0) | 0x29)
> +#define AD7293_REG_ISENSE_2			(AD7293_R2B | AD7293_PAGE(0x0) | 0x2A)
> +#define AD7293_REG_ISENSE_3			(AD7293_R2B | AD7293_PAGE(0x0) | 0x2B)
> +#define AD7293_REG_UNI_VOUT0			(AD7293_R2B | AD7293_PAGE(0x0) | 0x30)
> +#define AD7293_REG_UNI_VOUT1			(AD7293_R2B | AD7293_PAGE(0x0) | 0x31)
> +#define AD7293_REG_UNI_VOUT2			(AD7293_R2B | AD7293_PAGE(0x0) | 0x32)
> +#define AD7293_REG_UNI_VOUT3			(AD7293_R2B | AD7293_PAGE(0x0) | 0x33)
> +#define AD7293_REG_BI_VOUT0			(AD7293_R2B | AD7293_PAGE(0x0) | 0x34)
> +#define AD7293_REG_BI_VOUT1			(AD7293_R2B | AD7293_PAGE(0x0) | 0x35)
> +#define AD7293_REG_BI_VOUT2			(AD7293_R2B | AD7293_PAGE(0x0) | 0x36)
> +#define AD7293_REG_BI_VOUT3			(AD7293_R2B | AD7293_PAGE(0x0) | 0x37)
> +
> +/* AD7293 Register Map Page 0x1 */
> +#define AD7293_REG_AVDD				(AD7293_R2B | AD7293_PAGE(0x1) | 0x10)
> +#define AD7293_REG_DACVDD_UNI			(AD7293_R2B | AD7293_PAGE(0x1) | 0x11)
> +#define AD7293_REG_DACVDD_BI			(AD7293_R2B | AD7293_PAGE(0x1) | 0x12)
> +#define AD7293_REG_AVSS				(AD7293_R2B | AD7293_PAGE(0x1) | 0x13)
> +#define AD7293_REG_BI_VOUT0_MON			(AD7293_R2B | AD7293_PAGE(0x1) | 0x14)
> +#define AD7293_REG_BI_VIOU1_MON			(AD7293_R2B | AD7293_PAGE(0x1) | 0x15)
> +#define AD7293_REG_BI_VOUT2_MON			(AD7293_R2B | AD7293_PAGE(0x1) | 0x16)
> +#define AD7293_REG_BI_VOUT3_MON			(AD7293_R2B | AD7293_PAGE(0x1) | 0x17)
> +#define AD7293_REG_RS0_MON			(AD7293_R2B | AD7293_PAGE(0x1) | 0x28)
the same here, not need to define all registers in the datasheet.
Thanks,
Cai
> +#define AD7293_REG_RS1_MON			(AD7293_R2B | AD7293_PAGE(0x1) | 0x29)
> +#define AD7293_REG_RS2_MON			(AD7293_R2B | AD7293_PAGE(0x1) | 0x2A)
> +#define AD7293_REG_RS3_MON			(AD7293_R2B | AD7293_PAGE(0x1) | 0x2B)
> +
> +/* AD7293 Register Map Page 0x2 */
> +#define AD7293_REG_DIGITAL_OUT_EN		(AD7293_R2B | AD7293_PAGE(0x2) | 0x11)
> +#define AD7293_REG_DIGITAL_INOUT_FUNC		(AD7293_R2B | AD7293_PAGE(0x2) | 0x12)
> +#define AD7293_REG_DIGITAL_FUNC_POL		(AD7293_R2B | AD7293_PAGE(0x2) | 0x13)
> +#define AD7293_REG_GENERAL			(AD7293_R2B | AD7293_PAGE(0x2) | 0x14)
> +#define AD7293_REG_VINX_RANGE0			(AD7293_R2B | AD7293_PAGE(0x2) | 0x15)
> +#define AD7293_REG_VINX_RANGE1			(AD7293_R2B | AD7293_PAGE(0x2) | 0x16)
> +#define AD7293_REG_VINX_DIFF_SE			(AD7293_R2B | AD7293_PAGE(0x2) | 0x17)
> +#define AD7293_REG_VINX_FILTER			(AD7293_R2B | AD7293_PAGE(0x2) | 0x18)
> +#define AD7293_REG_BG_EN			(AD7293_R2B | AD7293_PAGE(0x2) | 0x19)
> +#define AD7293_REG_CONV_DELAY			(AD7293_R2B | AD7293_PAGE(0x2) | 0x1A)
> +#define AD7293_REG_TSENSE_BG_EN			(AD7293_R2B | AD7293_PAGE(0x2) | 0x1B)
> +#define AD7293_REG_ISENSE_BG_EN			(AD7293_R2B | AD7293_PAGE(0x2) | 0x1C)
> +#define AD7293_REG_ISENSE_GAIN			(AD7293_R2B | AD7293_PAGE(0x2) | 0x1D)
> +#define AD7293_REG_DAC_SNOOZE_O			(AD7293_R2B | AD7293_PAGE(0x2) | 0x1F)
> +#define AD7293_REG_DAC_SNOOZE_1			(AD7293_R2B | AD7293_PAGE(0x2) | 0x20)
> +#define AD7293_REG_RSX_MON_BG_EN		(AD7293_R2B | AD7293_PAGE(0x2) | 0x23)
> +#define AD7293_REG_INTEGR_CL			(AD7293_R2B | AD7293_PAGE(0x2) | 0x28)
> +#define AD7293_REG_PA_ON_CTRL			(AD7293_R2B | AD7293_PAGE(0x2) | 0x29)
> +#define AD7293_REG_RAMP_TIME_0			(AD7293_R2B | AD7293_PAGE(0x2) | 0x2A)
> +#define AD7293_REG_RAMP_TIME_1			(AD7293_R2B | AD7293_PAGE(0x2) | 0x2B)
> +#define AD7293_REG_RAMP_TIME_2			(AD7293_R2B | AD7293_PAGE(0x2) | 0x2C)
> +#define AD7293_REG_RAMP_TIME_3			(AD7293_R2B | AD7293_PAGE(0x2) | 0x2D)
> +#define AD7293_REG_CL_FR_IT			(AD7293_R2B | AD7293_PAGE(0x2) | 0x2E)
> +#define AD7293_REG_INTX_AVSS_AVDD		(AD7293_R2B | AD7293_PAGE(0x2) | 0x2F)
> +
> +/* AD7293 Register Map Page 0x3 */
> +#define AD7293_REG_VINX_SEQ			(AD7293_R2B | AD7293_PAGE(0x3) | 0x10)
> +#define AD7293_REG_ISENSEX_TSENSEX_SEQ		(AD7293_R2B | AD7293_PAGE(0x3) | 0x11)
> +#define AD7293_REG_RSX_MON_BI_VOUTX_SEQ		(AD7293_R2B | AD7293_PAGE(0x3) | 0x12)
> +
> +/* AD7293 Register Map Page 0xE */
> +#define AD7293_REG_VIN0_OFFSET			(AD7293_R1B | AD7293_PAGE(0xE) | 0x10)
> +#define AD7293_REG_VIN1_OFFSET			(AD7293_R1B | AD7293_PAGE(0xE) | 0x11)
> +#define AD7293_REG_VIN2_OFFSET			(AD7293_R1B | AD7293_PAGE(0xE) | 0x12)
> +#define AD7293_REG_VIN3_OFFSET			(AD7293_R1B | AD7293_PAGE(0xE) | 0x13)
> +#define AD7293_REG_TSENSE_INT_OFFSET		(AD7293_R1B | AD7293_PAGE(0xE) | 0x20)
> +#define AD7293_REG_TSENSE_D0_OFFSET		(AD7293_R1B | AD7293_PAGE(0xE) | 0x21)
> +#define AD7293_REG_TSENSE_D1_OFFSET		(AD7293_R1B | AD7293_PAGE(0xE) | 0x22)
> +#define AD7293_REG_ISENSE0_OFFSET		(AD7293_R1B | AD7293_PAGE(0xE) | 0x28)
> +#define AD7293_REG_ISENSE1_OFFSET		(AD7293_R1B | AD7293_PAGE(0xE) | 0x29)
> +#define AD7293_REG_ISENSE2_OFFSET		(AD7293_R1B | AD7293_PAGE(0xE) | 0x2A)
> +#define AD7293_REG_ISENSE3_OFFSET		(AD7293_R1B | AD7293_PAGE(0xE) | 0x2B)
> +#define AD7293_REG_UNI_VOUT0_OFFSET		(AD7293_R1B | AD7293_PAGE(0xE) | 0x30)
> +#define AD7293_REG_UNI_VOUT1_OFFSET		(AD7293_R1B | AD7293_PAGE(0xE) | 0x31)
> +#define AD7293_REG_UNI_VOUT2_OFFSET		(AD7293_R1B | AD7293_PAGE(0xE) | 0x32)
> +#define AD7293_REG_UNI_VOUT3_OFFSET		(AD7293_R1B | AD7293_PAGE(0xE) | 0x33)
> +#define AD7293_REG_BI_VOUT0_OFFSET		(AD7293_R1B | AD7293_PAGE(0xE) | 0x34)
> +#define AD7293_REG_BI_VOUT1_OFFSET		(AD7293_R1B | AD7293_PAGE(0xE) | 0x35)
> +#define AD7293_REG_BI_VOUT2_OFFSET		(AD7293_R1B | AD7293_PAGE(0xE) | 0x36)
> +#define AD7293_REG_BI_VOUT3_OFFSET		(AD7293_R1B | AD7293_PAGE(0xE) | 0x37)
> +
> +/* AD7293 Miscellaneous Definitions */
> +#define AD7293_READ				BIT(7)
> +#define AD7293_TRANSF_LEN_MSK			GENMASK(17, 16)
> +
> +#define AD7293_REG_ADDR_MSK			GENMASK(7, 0)
> +#define AD7293_REG_VOUT_OFFSET_MSK		GENMASK(5, 4)
> +#define AD7293_REG_DATA_RAW_MSK			GENMASK(15, 4)
> +#define AD7293_REG_VINX_RANGE_GET_CH_MSK(x, ch)	(((x) >> (ch)) & 0x1)
> +#define AD7293_REG_VINX_RANGE_SET_CH_MSK(x, ch)	(((x) & 0x1) << (ch))
> +#define AD7293_CHIP_ID				0x18
> +
> +enum ad7293_ch_type {
> +	AD7293_ADC_VINX,
> +	AD7293_ADC_TSENSE,
> +	AD7293_ADC_ISENSE,
> +	AD7293_DAC,
> +};
> +
> +enum ad7293_max_offset {
> +	AD7293_TSENSE_MIN_OFFSET_CH = 4,
> +	AD7293_ISENSE_MIN_OFFSET_CH = 7,
> +	AD7293_VOUT_MIN_OFFSET_CH = 11,
> +	AD7293_VOUT_MAX_OFFSET_CH = 18,
> +};
> +
> +static const int dac_offset_table[] = {0, 1, 2};
> +
> +static const int isense_gain_table[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
> +
> +static const int adc_range_table[] = {0, 1, 2, 3};
> +
> +struct ad7293_state {
> +	struct spi_device *spi;
> +	/* Protect against concurrent accesses to the device, page selection and data content */
> +	struct mutex lock;
> +	struct gpio_desc *gpio_reset;
> +	struct regulator *reg_avdd;
> +	struct regulator *reg_vdrive;
> +	u8 page_select;
> +	u8 data[3] ____cacheline_aligned;
> +};
> +
> +static int ad7293_page_select(struct ad7293_state *st, unsigned int reg)
> +{
> +	int ret;
> +
> +	if (st->page_select != FIELD_GET(AD7293_PAGE_ADDR_MSK, reg)) {
> +		st->data[0] = FIELD_GET(AD7293_REG_ADDR_MSK, AD7293_REG_PAGE_SELECT);
> +		st->data[1] = FIELD_GET(AD7293_PAGE_ADDR_MSK, reg);
> +
> +		ret = spi_write(st->spi, &st->data[0], 2);
> +		if (ret)
> +			return ret;
> +
> +		st->page_select = FIELD_GET(AD7293_PAGE_ADDR_MSK, reg);
> +	}
> +
> +	return 0;
> +}
> +
> +static int __ad7293_spi_read(struct ad7293_state *st, unsigned int reg,
> +			     u16 *val)
> +{
> +	int ret;
> +	unsigned int length;
> +	struct spi_transfer t = {0};
> +
> +	length = FIELD_GET(AD7293_TRANSF_LEN_MSK, reg);
> +
> +	ret = ad7293_page_select(st, reg);
> +	if (ret)
> +		return ret;
> +
> +	st->data[0] = AD7293_READ | FIELD_GET(AD7293_REG_ADDR_MSK, reg);
> +	st->data[1] = 0x0;
> +	st->data[2] = 0x0;
> +
> +	t.tx_buf = &st->data[0];
> +	t.rx_buf = &st->data[0];
> +	t.len = length + 1;
> +
> +	ret = spi_sync_transfer(st->spi, &t, 1);
> +	if (ret)
> +		return ret;
> +
> +	if (length == 1)
> +		*val = st->data[1];
> +	else
> +		*val = get_unaligned_be16(&st->data[1]);
> +
> +	return 0;
> +}
> +
> +static int ad7293_spi_read(struct ad7293_state *st, unsigned int reg,
> +			   u16 *val)
> +{
> +	int ret;
> +
> +	mutex_lock(&st->lock);
> +	ret = __ad7293_spi_read(st, reg, val);
> +	mutex_unlock(&st->lock);
> +
> +	return ret;
> +}
> +
> +static int __ad7293_spi_write(struct ad7293_state *st, unsigned int reg,
> +			      u16 val)
> +{
> +	int ret;
> +	unsigned int length;
> +
> +	length = FIELD_GET(AD7293_TRANSF_LEN_MSK, reg);
> +
> +	ret = ad7293_page_select(st, reg);
> +	if (ret)
> +		return ret;
> +
> +	st->data[0] = FIELD_GET(AD7293_REG_ADDR_MSK, reg);
> +
> +	if (length == 1)
> +		st->data[1] = val;
> +	else
> +		put_unaligned_be16(val, &st->data[1]);
> +
> +	return spi_write(st->spi, &st->data[0], length + 1);
> +}
> +
> +static int ad7293_spi_write(struct ad7293_state *st, unsigned int reg,
> +			    u16 val)
> +{
> +	int ret;
> +
> +	mutex_lock(&st->lock);
> +	ret = __ad7293_spi_write(st, reg, val);
> +	mutex_unlock(&st->lock);
> +
> +	return ret;
> +}
> +
> +static int __ad7293_spi_update_bits(struct ad7293_state *st, unsigned int reg,
> +				    u16 mask, u16 val)
> +{
> +	int ret;
> +	u16 data, temp;
> +
> +	ret = __ad7293_spi_read(st, reg, &data);
> +	if (ret)
> +		return ret;
> +
> +	temp = (data & ~mask) | (val & mask);
> +
> +	return __ad7293_spi_write(st, reg, temp);
> +}
> +
> +static int ad7293_spi_update_bits(struct ad7293_state *st, unsigned int reg,
> +				  u16 mask, u16 val)
> +{
> +	int ret;
> +
> +	mutex_lock(&st->lock);
> +	ret = __ad7293_spi_update_bits(st, reg, mask, val);
> +	mutex_unlock(&st->lock);
> +
> +	return ret;
> +}
> +
> +static int ad7293_adc_get_scale(struct ad7293_state *st, unsigned int ch, u16 *range)
> +{
> +	int ret;
> +	u16 data;
> +
> +	mutex_lock(&st->lock);
> +
> +	ret = __ad7293_spi_read(st, AD7293_REG_VINX_RANGE1, &data);
> +	if (ret)
> +		goto exit;
> +
> +	*range = AD7293_REG_VINX_RANGE_GET_CH_MSK(data, ch);
> +
> +	ret = __ad7293_spi_read(st, AD7293_REG_VINX_RANGE0, &data);
> +	if (ret)
> +		goto exit;
> +
> +	*range |= AD7293_REG_VINX_RANGE_GET_CH_MSK(data, ch) << 1;
> +
> +exit:
> +	mutex_unlock(&st->lock);
> +
> +	return ret;
> +}
> +
> +static int ad7293_adc_set_scale(struct ad7293_state *st, unsigned int ch, u16 range)
> +{
> +	int ret;
> +	unsigned int ch_msk = BIT(ch);
> +
> +	mutex_lock(&st->lock);
> +	ret = __ad7293_spi_update_bits(st, AD7293_REG_VINX_RANGE1, ch_msk,
> +				       AD7293_REG_VINX_RANGE_SET_CH_MSK(range, ch));
> +	if (ret)
> +		goto exit;
> +
> +	ret = __ad7293_spi_update_bits(st, AD7293_REG_VINX_RANGE0, ch_msk,
> +				       AD7293_REG_VINX_RANGE_SET_CH_MSK((range >> 1), ch));
> +
> +exit:
> +	mutex_unlock(&st->lock);
> +
> +	return ret;
> +}
> +
> +static int ad7293_get_offset(struct ad7293_state *st, unsigned int ch, u16 *offset)
> +{
> +	if (ch < AD7293_TSENSE_MIN_OFFSET_CH)
> +		return ad7293_spi_read(st, AD7293_REG_VIN0_OFFSET + ch, offset);
> +	else if (ch < AD7293_ISENSE_MIN_OFFSET_CH)
> +		return ad7293_spi_read(st, AD7293_REG_TSENSE_INT_OFFSET + (ch - 4), offset);
> +	else if (ch < AD7293_VOUT_MIN_OFFSET_CH)
> +		return ad7293_spi_read(st, AD7293_REG_ISENSE0_OFFSET + (ch - 7), offset);
> +	else if (ch <= AD7293_VOUT_MAX_OFFSET_CH)
> +		return ad7293_spi_read(st, AD7293_REG_UNI_VOUT0_OFFSET + (ch - 11), offset);
> +
> +	return -EINVAL;
> +}
> +
> +static int ad7293_set_offset(struct ad7293_state *st, unsigned int ch, u16 offset)
> +{
> +	if (ch < AD7293_TSENSE_MIN_OFFSET_CH)
> +		return ad7293_spi_write(st, AD7293_REG_VIN0_OFFSET + ch, offset);
> +	else if (ch < AD7293_ISENSE_MIN_OFFSET_CH)
> +		return ad7293_spi_write(st, AD7293_REG_TSENSE_INT_OFFSET +
> +					(ch - AD7293_TSENSE_MIN_OFFSET_CH), offset);
> +	else if (ch < AD7293_VOUT_MIN_OFFSET_CH)
> +		return ad7293_spi_write(st, AD7293_REG_ISENSE0_OFFSET +
> +					(ch - AD7293_ISENSE_MIN_OFFSET_CH), offset);
> +	else if (ch <= AD7293_VOUT_MAX_OFFSET_CH)
> +		return ad7293_spi_update_bits(st, AD7293_REG_UNI_VOUT0_OFFSET +
> +						(ch - AD7293_VOUT_MIN_OFFSET_CH),
> +						AD7293_REG_VOUT_OFFSET_MSK,
> +						FIELD_PREP(AD7293_REG_VOUT_OFFSET_MSK, offset));
> +
> +	return -EINVAL;
> +}
> +
> +static int ad7293_isense_set_scale(struct ad7293_state *st, unsigned int ch, u16 gain)
> +{
> +	unsigned int ch_msk = (0xf << (4 * ch));
> +
> +	return ad7293_spi_update_bits(st, AD7293_REG_ISENSE_GAIN, ch_msk, gain << (4 * ch));
> +}
> +
> +static int ad7293_isense_get_scale(struct ad7293_state *st, unsigned int ch, u16 *gain)
> +{
> +	int ret;
> +
> +	ret = ad7293_spi_read(st, AD7293_REG_ISENSE_GAIN, gain);
> +	if (ret)
> +		return ret;
> +
> +	*gain = (*gain >> (4 * ch)) & 0xf;
> +
> +	return ret;
> +}
> +
> +static int ad7293_dac_write_raw(struct ad7293_state *st, unsigned int ch, u16 raw)
> +{
> +	int ret;
> +
> +	mutex_lock(&st->lock);
> +
> +	ret = __ad7293_spi_update_bits(st, AD7293_REG_DAC_EN, BIT(ch), BIT(ch));
> +	if (ret)
> +		goto exit;
> +
> +	ret =  __ad7293_spi_write(st, AD7293_REG_UNI_VOUT0 + ch,
> +				  FIELD_PREP(AD7293_REG_DATA_RAW_MSK, raw));
> +
> +exit:
> +	mutex_unlock(&st->lock);
> +
> +	return ret;
> +}
> +
> +static int ad7293_ch_read_raw(struct ad7293_state *st, enum ad7293_ch_type type, unsigned int ch,
> +			      u16 *raw)
> +{
> +	int ret;
> +	unsigned int reg_wr, reg_rd, data_wr;
> +
> +	switch (type) {
> +	case AD7293_ADC_VINX:
> +		reg_wr = AD7293_REG_VINX_SEQ;
> +		reg_rd = AD7293_REG_VIN0 + ch;
> +		data_wr = BIT(ch);
> +
> +		break;
> +	case AD7293_ADC_TSENSE:
> +		reg_wr = AD7293_REG_ISENSEX_TSENSEX_SEQ;
> +		reg_rd = AD7293_REG_TSENSE_INT + ch;
> +		data_wr = BIT(ch);
> +
> +		break;
> +	case AD7293_ADC_ISENSE:
> +		reg_wr = AD7293_REG_ISENSEX_TSENSEX_SEQ;
> +		reg_rd = AD7293_REG_ISENSE_0 + ch;
> +		data_wr = BIT(ch) << 8;
> +
> +		break;
> +	case AD7293_DAC:
> +		reg_rd = AD7293_REG_UNI_VOUT0 + ch;
> +
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	mutex_lock(&st->lock);
> +
> +	if (type != AD7293_DAC) {
> +		if (type == AD7293_ADC_TSENSE) {
> +			ret = __ad7293_spi_write(st, AD7293_REG_TSENSE_BG_EN, BIT(ch));
> +			if (ret)
> +				goto exit;
> +
> +			usleep_range(9000, 9900);
> +		} else if (type == AD7293_ADC_ISENSE) {
> +			ret = __ad7293_spi_write(st, AD7293_REG_ISENSE_BG_EN, BIT(ch));
> +			if (ret)
> +				goto exit;
> +
> +			usleep_range(2000, 7000);
> +		}
> +
> +		ret = __ad7293_spi_write(st, reg_wr, data_wr);
> +		if (ret)
> +			goto exit;
> +
> +		ret = __ad7293_spi_write(st, AD7293_REG_CONV_CMD, 0x82);
> +		if (ret)
> +			goto exit;
> +	}
> +
> +	ret = __ad7293_spi_read(st, reg_rd, raw);
> +
> +	*raw = FIELD_GET(AD7293_REG_DATA_RAW_MSK, *raw);
> +
> +exit:
> +	mutex_unlock(&st->lock);
> +
> +	return ret;
> +}
> +
> +static int ad7293_read_raw(struct iio_dev *indio_dev,
> +			   struct iio_chan_spec const *chan,
> +			   int *val, int *val2, long info)
> +{
> +	struct ad7293_state *st = iio_priv(indio_dev);
> +	int ret;
> +	u16 data;
> +
> +	switch (info) {
> +	case IIO_CHAN_INFO_RAW:
> +		switch (chan->type) {
> +		case IIO_VOLTAGE:
> +			if (chan->output)
> +				ret =  ad7293_ch_read_raw(st, AD7293_DAC, chan->channel, &data);
> +			else
> +				ret =  ad7293_ch_read_raw(st, AD7293_ADC_VINX, chan->channel, &data);
> +
> +			break;
> +		case IIO_CURRENT:
> +			ret =  ad7293_ch_read_raw(st, AD7293_ADC_ISENSE, chan->channel, &data);
> +
> +			break;
> +		case IIO_TEMP:
> +			ret =  ad7293_ch_read_raw(st, AD7293_ADC_TSENSE, chan->channel, &data);
> +
> +			break;
> +		default:
> +			return -EINVAL;
> +		}
> +
> +		if (ret)
> +			return ret;
> +
> +		*val = data;
> +
> +		return IIO_VAL_INT;
> +	case IIO_CHAN_INFO_OFFSET:
> +		switch (chan->type) {
> +		case IIO_VOLTAGE:
> +			if (chan->output) {
> +				ret = ad7293_get_offset(st, chan->channel +
> +							AD7293_VOUT_MIN_OFFSET_CH, &data);
> +
> +				data = FIELD_GET(AD7293_REG_VOUT_OFFSET_MSK, data);
> +			} else {
> +				ret = ad7293_get_offset(st, chan->channel, &data);
> +			}
> +
> +			break;
> +		case IIO_CURRENT:
> +			ret = ad7293_get_offset(st, chan->channel +
> +						AD7293_ISENSE_MIN_OFFSET_CH, &data);
> +
> +			break;
> +		case IIO_TEMP:
> +			ret = ad7293_get_offset(st, chan->channel +
> +						AD7293_TSENSE_MIN_OFFSET_CH, &data);
> +
> +			break;
> +		default:
> +			return -EINVAL;
> +		}
> +		if (ret)
> +			return ret;
> +
> +		*val = data;
> +
> +		return IIO_VAL_INT;
> +	case IIO_CHAN_INFO_SCALE:
> +		switch (chan->type) {
> +		case IIO_VOLTAGE:
> +			ret = ad7293_adc_get_scale(st, chan->channel, &data);
> +			if (ret)
> +				return ret;
> +
> +			*val = data;
> +
> +			return IIO_VAL_INT;
> +		case IIO_CURRENT:
> +			ret = ad7293_isense_get_scale(st, chan->channel, &data);
> +			if (ret)
> +				return ret;
> +
> +			*val = data;
> +
> +			return IIO_VAL_INT;
> +		case IIO_TEMP:
> +			*val = 1;
> +			*val2 = 8;
> +
> +			return IIO_VAL_FRACTIONAL;
> +		default:
> +			return -EINVAL;
> +		}
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static int ad7293_write_raw(struct iio_dev *indio_dev,
> +			    struct iio_chan_spec const *chan,
> +			    int val, int val2, long info)
> +{
> +	struct ad7293_state *st = iio_priv(indio_dev);
> +
> +	switch (info) {
> +	case IIO_CHAN_INFO_RAW:
> +		switch (chan->type) {
> +		case IIO_VOLTAGE:
> +			if (!chan->output)
> +				return -EINVAL;
> +
> +			return ad7293_dac_write_raw(st, chan->channel, val);
> +		default:
> +			return -EINVAL;
> +		}
> +	case IIO_CHAN_INFO_OFFSET:
> +		switch (chan->type) {
> +		case IIO_VOLTAGE:
> +			if (chan->output)
> +				return ad7293_set_offset(st, chan->channel +
> +							 AD7293_VOUT_MIN_OFFSET_CH, val);
> +			else
> +				return ad7293_set_offset(st, chan->channel, val);
> +		case IIO_CURRENT:
> +			return ad7293_set_offset(st, chan->channel +
> +						 AD7293_ISENSE_MIN_OFFSET_CH, val);
> +		case IIO_TEMP:
> +			return ad7293_set_offset(st, chan->channel +
> +						 AD7293_TSENSE_MIN_OFFSET_CH, val);
> +		default:
> +			return -EINVAL;
> +		}
> +	case IIO_CHAN_INFO_SCALE:
> +		switch (chan->type) {
> +		case IIO_VOLTAGE:
> +			return ad7293_adc_set_scale(st, chan->channel, val);
> +		case IIO_CURRENT:
> +			return ad7293_isense_set_scale(st, chan->channel, val);
> +		default:
> +			return -EINVAL;
> +		}
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static int ad7293_reg_access(struct iio_dev *indio_dev,
> +			     unsigned int reg,
> +			     unsigned int write_val,
> +			     unsigned int *read_val)
> +{
> +	struct ad7293_state *st = iio_priv(indio_dev);
> +	int ret;
> +
> +	if (read_val)
> +		ret = ad7293_spi_read(st, reg, (u16 *)read_val);
> +	else
> +		ret = ad7293_spi_write(st, reg, (u16)write_val);
> +
> +	return ret;
> +}
> +
> +static int ad7293_read_avail(struct iio_dev *indio_dev,
> +			     struct iio_chan_spec const *chan,
> +			     const int **vals, int *type, int *length,
> +			     long info)
> +{
> +	switch (info) {
> +	case IIO_CHAN_INFO_OFFSET:
> +		*vals = dac_offset_table;
> +		*type = IIO_VAL_INT;
> +		*length = ARRAY_SIZE(dac_offset_table);
> +
> +		return IIO_AVAIL_LIST;
> +	case IIO_CHAN_INFO_SCALE:
> +		*type = IIO_VAL_INT;
> +
> +		switch (chan->type) {
> +		case IIO_VOLTAGE:
> +			*vals = adc_range_table;
> +			*length = ARRAY_SIZE(adc_range_table);
> +			return IIO_AVAIL_LIST;
> +		case IIO_CURRENT:
> +			*vals = isense_gain_table;
> +			*length = ARRAY_SIZE(isense_gain_table);
> +			return IIO_AVAIL_LIST;
> +		default:
> +			return -EINVAL;
> +		}
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +#define AD7293_CHAN_ADC(_channel) {						\
> +	.type = IIO_VOLTAGE,							\
> +	.output = 0,								\
> +	.indexed = 1,								\
> +	.channel = _channel,							\
> +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) | \
> +			      BIT(IIO_CHAN_INFO_OFFSET),			\
> +	.info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_SCALE)		\
> +}
> +
> +#define AD7293_CHAN_DAC(_channel) {						\
> +	.type = IIO_VOLTAGE,							\
> +	.output = 1,								\
> +	.indexed = 1,								\
> +	.channel = _channel,							\
> +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_OFFSET), \
> +	.info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_OFFSET)		\
> +}
> +
> +#define AD7293_CHAN_ISENSE(_channel) {						\
> +	.type = IIO_CURRENT,							\
> +	.output = 0,								\
> +	.indexed = 1,								\
> +	.channel = _channel,							\
> +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_OFFSET) | \
> +			      BIT(IIO_CHAN_INFO_SCALE),				\
> +	.info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_SCALE)		\
> +}
> +
> +#define AD7293_CHAN_TEMP(_channel) {						\
> +	.type = IIO_TEMP,							\
> +	.output = 0,								\
> +	.indexed = 1,								\
> +	.channel = _channel,							\
> +	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_OFFSET), \
> +	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE)			\
> +}
> +
> +static const struct iio_chan_spec ad7293_channels[] = {
> +	AD7293_CHAN_ADC(0),
> +	AD7293_CHAN_ADC(1),
> +	AD7293_CHAN_ADC(2),
> +	AD7293_CHAN_ADC(3),
> +	AD7293_CHAN_ISENSE(0),
> +	AD7293_CHAN_ISENSE(1),
> +	AD7293_CHAN_ISENSE(2),
> +	AD7293_CHAN_ISENSE(3),
> +	AD7293_CHAN_TEMP(0),
> +	AD7293_CHAN_TEMP(1),
> +	AD7293_CHAN_TEMP(2),
> +	AD7293_CHAN_DAC(0),
> +	AD7293_CHAN_DAC(1),
> +	AD7293_CHAN_DAC(2),
> +	AD7293_CHAN_DAC(3),
> +	AD7293_CHAN_DAC(4),
> +	AD7293_CHAN_DAC(5),
> +	AD7293_CHAN_DAC(6),
> +	AD7293_CHAN_DAC(7)
> +};
> +
> +static int ad7293_soft_reset(struct ad7293_state *st)
> +{
> +	int ret;
> +
> +	ret = __ad7293_spi_write(st, AD7293_REG_SOFT_RESET, 0x7293);
> +	if (ret)
> +		return ret;
> +
> +	return __ad7293_spi_write(st, AD7293_REG_SOFT_RESET, 0x0000);
> +}
> +
> +static int ad7293_reset(struct ad7293_state *st)
> +{
> +	if (st->gpio_reset) {
> +		gpiod_set_value(st->gpio_reset, 0);
> +		usleep_range(100, 1000);
> +		gpiod_set_value(st->gpio_reset, 1);
> +		usleep_range(100, 1000);
> +
> +		return 0;
> +	}
> +
> +	/* Perform a software reset */
> +	return ad7293_soft_reset(st);
> +}
> +
> +static int ad7293_properties_parse(struct ad7293_state *st)
> +{
> +	struct spi_device *spi = st->spi;
> +
> +	st->gpio_reset = devm_gpiod_get_optional(&st->spi->dev, "reset",
> +						 GPIOD_OUT_HIGH);
> +	if (IS_ERR(st->gpio_reset))
> +		return dev_err_probe(&spi->dev, PTR_ERR(st->gpio_reset),
> +				     "failed to get the reset GPIO\n");
> +
> +	st->reg_avdd = devm_regulator_get(&spi->dev, "avdd");
> +	if (IS_ERR(st->reg_avdd))
> +		return dev_err_probe(&spi->dev, PTR_ERR(st->reg_avdd),
> +				     "failed to get the AVDD voltage\n");
> +
> +	st->reg_vdrive = devm_regulator_get(&spi->dev, "vdrive");
> +	if (IS_ERR(st->reg_vdrive))
> +		return dev_err_probe(&spi->dev, PTR_ERR(st->reg_vdrive),
> +				     "failed to get the VDRIVE voltage\n");
> +
> +	return 0;
> +}
> +
> +static void ad7293_reg_disable(void *data)
> +{
> +	regulator_disable(data);
> +}
> +
> +static int ad7293_init(struct ad7293_state *st)
> +{
> +	int ret;
> +	u16 chip_id;
> +	struct spi_device *spi = st->spi;
> +
> +	ret = ad7293_properties_parse(st);
> +	if (ret)
> +		return ret;
> +
> +	ret = ad7293_reset(st);
> +	if (ret)
> +		return ret;
> +
> +	ret = regulator_enable(st->reg_avdd);
> +	if (ret) {
> +		dev_err(&spi->dev, "Failed to enable specified AVDD Voltage!\n");
> +		return ret;
> +	}
> +
> +	ret = devm_add_action_or_reset(&spi->dev, ad7293_reg_disable,
> +				       st->reg_avdd);
> +	if (ret)
> +		return ret;
> +
> +	ret = regulator_enable(st->reg_vdrive);
> +	if (ret) {
> +		dev_err(&spi->dev, "Failed to enable specified VDRIVE Voltage!\n");
> +		return ret;
> +	}
> +
> +	ret = devm_add_action_or_reset(&spi->dev, ad7293_reg_disable,
> +				       st->reg_vdrive);
> +	if (ret)
> +		return ret;
> +
> +	ret = regulator_get_voltage(st->reg_avdd);
> +	if (ret < 0) {
> +		dev_err(&spi->dev, "Failed to read avdd regulator: %d\n", ret);
> +		return ret;
> +	}
> +
> +	if (ret > 5500000 || ret < 4500000)
> +		return -EINVAL;
> +
> +	ret = regulator_get_voltage(st->reg_vdrive);
> +	if (ret < 0) {
> +		dev_err(&spi->dev, "Failed to read vdrive regulator: %d\n", ret);
> +		return ret;
> +	}
> +	if (ret > 5500000 || ret < 1700000)
> +		return -EINVAL;
> +
> +	/* Check Chip ID */
> +	ret = __ad7293_spi_read(st, AD7293_REG_DEVICE_ID, &chip_id);
> +	if (ret)
> +		return ret;
> +
> +	if (chip_id != AD7293_CHIP_ID) {
> +		dev_err(&spi->dev, "Invalid Chip ID.\n");
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static const struct iio_info ad7293_info = {
> +	.read_raw = ad7293_read_raw,
> +	.write_raw = ad7293_write_raw,
> +	.read_avail = &ad7293_read_avail,
> +	.debugfs_reg_access = &ad7293_reg_access,
> +};
> +
> +static int ad7293_probe(struct spi_device *spi)
> +{
> +	struct iio_dev *indio_dev;
> +	struct ad7293_state *st;
> +	int ret;
> +
> +	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
> +	if (!indio_dev)
> +		return -ENOMEM;
> +
> +	st = iio_priv(indio_dev);
> +
> +	indio_dev->info = &ad7293_info;
> +	indio_dev->name = "ad7293";
> +	indio_dev->channels = ad7293_channels;
> +	indio_dev->num_channels = ARRAY_SIZE(ad7293_channels);
> +
> +	st->spi = spi;
> +	st->page_select = 0;
> +
> +	mutex_init(&st->lock);
> +
> +	ret = ad7293_init(st);
> +	if (ret)
> +		return ret;
> +
> +	return devm_iio_device_register(&spi->dev, indio_dev);
> +}
> +
> +static const struct spi_device_id ad7293_id[] = {
> +	{ "ad7293", 0 },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(spi, ad7293_id);
> +
> +static const struct of_device_id ad7293_of_match[] = {
> +	{ .compatible = "adi,ad7293" },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, ad7293_of_match);
> +
> +static struct spi_driver ad7293_driver = {
> +	.driver = {
> +		.name = "ad7293",
> +		.of_match_table = ad7293_of_match,
> +	},
> +	.probe = ad7293_probe,
> +	.id_table = ad7293_id,
> +};
> +module_spi_driver(ad7293_driver);
> +
> +MODULE_AUTHOR("Antoniu Miclaus <antoniu.miclaus@analog.com");
> +MODULE_DESCRIPTION("Analog Devices AD7293");
> +MODULE_LICENSE("GPL v2");
> -- 
> 2.34.1
>