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Date: Sun, 20 May 2018 11:37:13 +0100
From: Jonathan Cameron <jic23@...nel.org>
To: Stefan Popa <stefan.popa@...log.com>
Cc: <Michael.Hennerich@...log.com>, <lars@...afoo.de>,
<knaack.h@....de>, <pmeerw@...erw.net>, <linux-pm@...r.kernel.org>,
<linux-iio@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] iio:dac:ad5686: Add
AD5691R/AD5692R/AD5693/AD5693R support
On Fri, 18 May 2018 18:22:50 +0300
Stefan Popa <stefan.popa@...log.com> wrote:
> The AD5691R/AD5692R/AD5693/AD5693R are a family of one channel DACs with
> 12-bit, 14-bit and 16-bit precision respectively. The devices have either
> no built-in reference, or built-in 2.5V reference.
>
> These devices are pretty similar to AD5671R/AD5675R and
> AD5694/AD5694R/AD5695R/AD5696/AD5696R, except that they have one channel.
> Another difference is that they use a write control register(addr 0x04) for
> setting the power down modes and the internal reference instead of separate
> registers for each function.
>
> Datasheet:
> http://www.analog.com/media/en/technical-documentation/data-sheets/AD5693R_5692R_5691R_5693.pdf
>
> Signed-off-by: Stefan Popa <stefan.popa@...log.com>
Nice fast turn around and a nice little patch.
Applied to the togreg branch of iio.git and pushed out as testing
for the autobuilders to play with it.
Thanks,
Jonathan
> ---
> Changes in v2:
> - Removed the initialization for ref_bit_msk and shift variables
> from ad5686_write_dac_powerdown() and ad5686_probe().
> - Added the the missing default case from
> ad5686_write_dac_powerdown() and ad5686_probe().
>
> drivers/iio/dac/ad5686.c | 93 +++++++++++++++++++++++++++++++++++++++++---
> drivers/iio/dac/ad5686.h | 16 ++++++++
> drivers/iio/dac/ad5696-i2c.c | 7 +++-
> 3 files changed, 109 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/iio/dac/ad5686.c b/drivers/iio/dac/ad5686.c
> index 89c5f08..1fc0c56 100644
> --- a/drivers/iio/dac/ad5686.c
> +++ b/drivers/iio/dac/ad5686.c
> @@ -70,6 +70,8 @@ static ssize_t ad5686_write_dac_powerdown(struct iio_dev *indio_dev,
> bool readin;
> int ret;
> struct ad5686_state *st = iio_priv(indio_dev);
> + unsigned int val, ref_bit_msk;
> + u8 shift;
>
> ret = strtobool(buf, &readin);
> if (ret)
> @@ -80,9 +82,24 @@ static ssize_t ad5686_write_dac_powerdown(struct iio_dev *indio_dev,
> else
> st->pwr_down_mask &= ~(0x3 << (chan->channel * 2));
>
> - ret = st->write(st, AD5686_CMD_POWERDOWN_DAC, 0,
> - st->pwr_down_mask & st->pwr_down_mode);
> + switch (st->chip_info->regmap_type) {
> + case AD5686_REGMAP:
> + shift = 0;
> + ref_bit_msk = 0;
> + break;
> + case AD5693_REGMAP:
> + shift = 13;
> + ref_bit_msk = AD5693_REF_BIT_MSK;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + val = ((st->pwr_down_mask & st->pwr_down_mode) << shift);
> + if (!st->use_internal_vref)
> + val |= ref_bit_msk;
>
> + ret = st->write(st, AD5686_CMD_POWERDOWN_DAC, 0, val);
>
> return ret ? ret : len;
> }
> @@ -175,6 +192,11 @@ static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {
> .ext_info = ad5686_ext_info, \
> }
>
> +#define DECLARE_AD5693_CHANNELS(name, bits, _shift) \
> +static struct iio_chan_spec name[] = { \
> + AD5868_CHANNEL(0, 0, bits, _shift), \
> +}
> +
> #define DECLARE_AD5686_CHANNELS(name, bits, _shift) \
> static struct iio_chan_spec name[] = { \
> AD5868_CHANNEL(0, 1, bits, _shift), \
> @@ -200,72 +222,112 @@ DECLARE_AD5676_CHANNELS(ad5676_channels, 16, 0);
> DECLARE_AD5686_CHANNELS(ad5684_channels, 12, 4);
> DECLARE_AD5686_CHANNELS(ad5685r_channels, 14, 2);
> DECLARE_AD5686_CHANNELS(ad5686_channels, 16, 0);
> +DECLARE_AD5693_CHANNELS(ad5693_channels, 16, 0);
> +DECLARE_AD5693_CHANNELS(ad5692r_channels, 14, 2);
> +DECLARE_AD5693_CHANNELS(ad5691r_channels, 12, 4);
>
> static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
> [ID_AD5671R] = {
> .channels = ad5672_channels,
> .int_vref_mv = 2500,
> .num_channels = 8,
> + .regmap_type = AD5686_REGMAP,
> },
> [ID_AD5672R] = {
> .channels = ad5672_channels,
> .int_vref_mv = 2500,
> .num_channels = 8,
> + .regmap_type = AD5686_REGMAP,
> },
> [ID_AD5675R] = {
> .channels = ad5676_channels,
> .int_vref_mv = 2500,
> .num_channels = 8,
> + .regmap_type = AD5686_REGMAP,
> },
> [ID_AD5676] = {
> .channels = ad5676_channels,
> .num_channels = 8,
> + .regmap_type = AD5686_REGMAP,
> },
> [ID_AD5676R] = {
> .channels = ad5676_channels,
> .int_vref_mv = 2500,
> .num_channels = 8,
> + .regmap_type = AD5686_REGMAP,
> },
> [ID_AD5684] = {
> .channels = ad5684_channels,
> .num_channels = 4,
> + .regmap_type = AD5686_REGMAP,
> },
> [ID_AD5684R] = {
> .channels = ad5684_channels,
> .int_vref_mv = 2500,
> .num_channels = 4,
> + .regmap_type = AD5686_REGMAP,
> },
> [ID_AD5685R] = {
> .channels = ad5685r_channels,
> .int_vref_mv = 2500,
> .num_channels = 4,
> + .regmap_type = AD5686_REGMAP,
> },
> [ID_AD5686] = {
> .channels = ad5686_channels,
> .num_channels = 4,
> + .regmap_type = AD5686_REGMAP,
> },
> [ID_AD5686R] = {
> .channels = ad5686_channels,
> .int_vref_mv = 2500,
> .num_channels = 4,
> + .regmap_type = AD5686_REGMAP,
> + },
> + [ID_AD5691R] = {
> + .channels = ad5691r_channels,
> + .int_vref_mv = 2500,
> + .num_channels = 1,
> + .regmap_type = AD5693_REGMAP,
> + },
> + [ID_AD5692R] = {
> + .channels = ad5692r_channels,
> + .int_vref_mv = 2500,
> + .num_channels = 1,
> + .regmap_type = AD5693_REGMAP,
> + },
> + [ID_AD5693] = {
> + .channels = ad5693_channels,
> + .num_channels = 1,
> + .regmap_type = AD5693_REGMAP,
> + },
> + [ID_AD5693R] = {
> + .channels = ad5693_channels,
> + .int_vref_mv = 2500,
> + .num_channels = 1,
> + .regmap_type = AD5693_REGMAP,
> },
> [ID_AD5694] = {
> .channels = ad5684_channels,
> .num_channels = 4,
> + .regmap_type = AD5686_REGMAP,
> },
> [ID_AD5694R] = {
> .channels = ad5684_channels,
> .int_vref_mv = 2500,
> .num_channels = 4,
> + .regmap_type = AD5686_REGMAP,
> },
> [ID_AD5696] = {
> .channels = ad5686_channels,
> .num_channels = 4,
> + .regmap_type = AD5686_REGMAP,
> },
> [ID_AD5696R] = {
> .channels = ad5686_channels,
> .int_vref_mv = 2500,
> .num_channels = 4,
> + .regmap_type = AD5686_REGMAP,
> },
> };
>
> @@ -276,7 +338,9 @@ int ad5686_probe(struct device *dev,
> {
> struct ad5686_state *st;
> struct iio_dev *indio_dev;
> - int ret, voltage_uv = 0;
> + unsigned int val, ref_bit_msk;
> + u8 cmd;
> + int ret, i, voltage_uv = 0;
>
> indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
> if (indio_dev == NULL)
> @@ -310,7 +374,8 @@ int ad5686_probe(struct device *dev,
> st->vref_mv = st->chip_info->int_vref_mv;
>
> /* Set all the power down mode for all channels to 1K pulldown */
> - st->pwr_down_mode = 0x55;
> + for (i = 0; i < st->chip_info->num_channels; i++)
> + st->pwr_down_mode |= (0x01 << (i * 2));
>
> indio_dev->dev.parent = dev;
> indio_dev->name = name;
> @@ -319,8 +384,24 @@ int ad5686_probe(struct device *dev,
> indio_dev->channels = st->chip_info->channels;
> indio_dev->num_channels = st->chip_info->num_channels;
>
> - ret = st->write(st, AD5686_CMD_INTERNAL_REFER_SETUP,
> - 0, !!voltage_uv);
> + switch (st->chip_info->regmap_type) {
> + case AD5686_REGMAP:
> + cmd = AD5686_CMD_INTERNAL_REFER_SETUP;
> + ref_bit_msk = 0;
> + break;
> + case AD5693_REGMAP:
> + cmd = AD5686_CMD_CONTROL_REG;
> + ref_bit_msk = AD5693_REF_BIT_MSK;
> + st->use_internal_vref = !voltage_uv;
> + break;
> + default:
> + ret = -EINVAL;
> + goto error_disable_reg;
> + }
> +
> + val = (voltage_uv | ref_bit_msk);
> +
> + ret = st->write(st, cmd, 0, !!val);
> if (ret)
> goto error_disable_reg;
>
> diff --git a/drivers/iio/dac/ad5686.h b/drivers/iio/dac/ad5686.h
> index 05f0ce9..6c6879d 100644
> --- a/drivers/iio/dac/ad5686.h
> +++ b/drivers/iio/dac/ad5686.h
> @@ -35,6 +35,9 @@
> #define AD5686_LDAC_PWRDN_100K 0x2
> #define AD5686_LDAC_PWRDN_3STATE 0x3
>
> +#define AD5686_CMD_CONTROL_REG 0x4
> +#define AD5693_REF_BIT_MSK BIT(12)
> +
> /**
> * ad5686_supported_device_ids:
> */
> @@ -49,6 +52,10 @@ enum ad5686_supported_device_ids {
> ID_AD5685R,
> ID_AD5686,
> ID_AD5686R,
> + ID_AD5691R,
> + ID_AD5692R,
> + ID_AD5693,
> + ID_AD5693R,
> ID_AD5694,
> ID_AD5694R,
> ID_AD5695R,
> @@ -56,6 +63,11 @@ enum ad5686_supported_device_ids {
> ID_AD5696R,
> };
>
> +enum ad5686_regmap_type {
> + AD5686_REGMAP,
> + AD5693_REGMAP
> +};
> +
> struct ad5686_state;
>
> typedef int (*ad5686_write_func)(struct ad5686_state *st,
> @@ -68,12 +80,14 @@ typedef int (*ad5686_read_func)(struct ad5686_state *st, u8 addr);
> * @int_vref_mv: AD5620/40/60: the internal reference voltage
> * @num_channels: number of channels
> * @channel: channel specification
> + * @regmap_type: register map layout variant
> */
>
> struct ad5686_chip_info {
> u16 int_vref_mv;
> unsigned int num_channels;
> struct iio_chan_spec *channels;
> + enum ad5686_regmap_type regmap_type;
> };
>
> /**
> @@ -84,6 +98,7 @@ struct ad5686_chip_info {
> * @vref_mv: actual reference voltage used
> * @pwr_down_mask: power down mask
> * @pwr_down_mode: current power down mode
> + * @use_internal_vref: set to true if the internal reference voltage is used
> * @data: spi transfer buffers
> */
>
> @@ -96,6 +111,7 @@ struct ad5686_state {
> unsigned int pwr_down_mode;
> ad5686_write_func write;
> ad5686_read_func read;
> + bool use_internal_vref;
>
> /*
> * DMA (thus cache coherency maintenance) requires the
> diff --git a/drivers/iio/dac/ad5696-i2c.c b/drivers/iio/dac/ad5696-i2c.c
> index 275e032..d18735d 100644
> --- a/drivers/iio/dac/ad5696-i2c.c
> +++ b/drivers/iio/dac/ad5696-i2c.c
> @@ -1,6 +1,7 @@
> // SPDX-License-Identifier: GPL-2.0+
> /*
> - * AD5671R, AD5675R, AD5694, AD5694R, AD5695R, AD5696, AD5696R
> + * AD5671R, AD5675R, AD5691R, AD5692R, AD5693, AD5693R,
> + * AD5694, AD5694R, AD5695R, AD5696, AD5696R
> * Digital to analog converters driver
> *
> * Copyright 2018 Analog Devices Inc.
> @@ -72,6 +73,10 @@ static int ad5686_i2c_remove(struct i2c_client *i2c)
> static const struct i2c_device_id ad5686_i2c_id[] = {
> {"ad5671r", ID_AD5671R},
> {"ad5675r", ID_AD5675R},
> + {"ad5691r", ID_AD5691R},
> + {"ad5692r", ID_AD5692R},
> + {"ad5693", ID_AD5693},
> + {"ad5693r", ID_AD5693R},
> {"ad5694", ID_AD5694},
> {"ad5694r", ID_AD5694R},
> {"ad5695r", ID_AD5695R},
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