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Date: Fri, 6 Apr 2018 16:19:20 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Stefan Popa <stefan.popa@...log.com>
CC: <lars@...afoo.de>, <Michael.Hennerich@...log.com>,
<jic23@...nel.org>, <knaack.h@....de>, <pmeerw@...erw.net>,
<linux-pm@...r.kernel.org>, <linux-iio@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] iio:dac:ad5686: Add
AD5672R/AD5676/AD5676R/AD5684R/AD5685R/AD5686R support
On Fri, 30 Mar 2018 16:55:18 +0300
Stefan Popa <stefan.popa@...log.com> wrote:
> The AD5684R/AD5685R/AD5686R are a family of 4 channel DACs with 12-bit,
> 14-bit and 16-bit precision respectively. The devices come either with a
> built-in reference or no built-in reference.
>
> The AD5672R/AD5676/AD5676R are similar, except that they have 8 channels
> instead of 4.
>
> Datasheets:
> http://www.analog.com/media/en/technical-documentation/data-sheets/AD5672R_5676R.pdf
> http://www.analog.com/media/en/technical-documentation/data-sheets/AD5686R_5685R_5684R.pdf
>
> Signed-off-by: Stefan Popa <stefan.popa@...log.com>
For ease of review, I would prefer to see this split into 2 patches.
First refactor to add num channels and the new macro forms for existing parts.
Then add the new parts.
Jonathan
> ---
> drivers/iio/dac/ad5686.c | 97 ++++++++++++++++++++++++++++++++++++------------
> 1 file changed, 74 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/iio/dac/ad5686.c b/drivers/iio/dac/ad5686.c
> index f7f975c..5fb0179 100644
> --- a/drivers/iio/dac/ad5686.c
> +++ b/drivers/iio/dac/ad5686.c
> @@ -19,8 +19,6 @@
> #include <linux/iio/iio.h>
> #include <linux/iio/sysfs.h>
>
> -#define AD5686_DAC_CHANNELS 4
> -
> #define AD5686_ADDR(x) ((x) << 16)
> #define AD5686_CMD(x) ((x) << 20)
>
> @@ -46,12 +44,14 @@
> /**
> * struct ad5686_chip_info - chip specific information
> * @int_vref_mv: AD5620/40/60: the internal reference voltage
> + * @num_channels: number of channels
> * @channel: channel specification
> */
>
> struct ad5686_chip_info {
> u16 int_vref_mv;
> - struct iio_chan_spec channel[AD5686_DAC_CHANNELS];
> + unsigned int num_channels;
> + struct iio_chan_spec *channels;
> };
>
> /**
> @@ -88,9 +88,14 @@ struct ad5686_state {
> */
>
> enum ad5686_supported_device_ids {
> + ID_AD5672R,
> + ID_AD5676,
> + ID_AD5676R,
> ID_AD5684,
> - ID_AD5685,
> + ID_AD5684R,
> + ID_AD5685R,
> ID_AD5686,
> + ID_AD5686R
> };
> static int ad5686_spi_write(struct ad5686_state *st,
> u8 cmd, u8 addr, u16 val, u8 shift)
> @@ -269,14 +274,14 @@ static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {
> { },
> };
>
> -#define AD5868_CHANNEL(chan, bits, _shift) { \
> +#define AD5868_CHANNEL(chan, addr, bits, _shift) { \
> .type = IIO_VOLTAGE, \
> .indexed = 1, \
> .output = 1, \
> .channel = chan, \
> .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
> .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
> - .address = AD5686_ADDR_DAC(chan), \
> + .address = addr, \
> .scan_type = { \
> .sign = 'u', \
> .realbits = (bits), \
> @@ -286,31 +291,72 @@ static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {
> .ext_info = ad5686_ext_info, \
> }
>
> +#define DECLARE_AD5686_CHANNELS(name, bits, _shift) \
> +static struct iio_chan_spec name[] = { \
> + AD5868_CHANNEL(0, 1, bits, _shift), \
> + AD5868_CHANNEL(1, 2, bits, _shift), \
> + AD5868_CHANNEL(2, 4, bits, _shift), \
> + AD5868_CHANNEL(3, 8, bits, _shift), \
> +}
> +
> +#define DECLARE_AD5676_CHANNELS(name, bits, _shift) \
> +static struct iio_chan_spec name[] = { \
> + AD5868_CHANNEL(0, 0, bits, _shift), \
> + AD5868_CHANNEL(1, 1, bits, _shift), \
> + AD5868_CHANNEL(2, 2, bits, _shift), \
> + AD5868_CHANNEL(3, 3, bits, _shift), \
> + AD5868_CHANNEL(4, 4, bits, _shift), \
> + AD5868_CHANNEL(5, 5, bits, _shift), \
> + AD5868_CHANNEL(6, 6, bits, _shift), \
> + AD5868_CHANNEL(7, 7, bits, _shift), \
> +}
> +
> +DECLARE_AD5676_CHANNELS(ad5672_channels, 12, 4);
> +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);
> +
> static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
> + [ID_AD5672R] = {
> + .channels = ad5672_channels,
> + .int_vref_mv = 2500,
> + .num_channels = 8,
> + },
> + [ID_AD5676] = {
> + .channels = ad5676_channels,
> + .num_channels = 8,
> + },
> + [ID_AD5676R] = {
> + .channels = ad5676_channels,
> + .int_vref_mv = 2500,
> + .num_channels = 8,
> + },
> [ID_AD5684] = {
> - .channel[0] = AD5868_CHANNEL(0, 12, 4),
> - .channel[1] = AD5868_CHANNEL(1, 12, 4),
> - .channel[2] = AD5868_CHANNEL(2, 12, 4),
> - .channel[3] = AD5868_CHANNEL(3, 12, 4),
> + .channels = ad5684_channels,
> + .num_channels = 4,
> + },
> + [ID_AD5684R] = {
> + .channels = ad5684_channels,
> .int_vref_mv = 2500,
> + .num_channels = 4,
> },
> - [ID_AD5685] = {
> - .channel[0] = AD5868_CHANNEL(0, 14, 2),
> - .channel[1] = AD5868_CHANNEL(1, 14, 2),
> - .channel[2] = AD5868_CHANNEL(2, 14, 2),
> - .channel[3] = AD5868_CHANNEL(3, 14, 2),
> + [ID_AD5685R] = {
> + .channels = ad5685r_channels,
> .int_vref_mv = 2500,
> + .num_channels = 4,
> },
> [ID_AD5686] = {
> - .channel[0] = AD5868_CHANNEL(0, 16, 0),
> - .channel[1] = AD5868_CHANNEL(1, 16, 0),
> - .channel[2] = AD5868_CHANNEL(2, 16, 0),
> - .channel[3] = AD5868_CHANNEL(3, 16, 0),
> + .channels = ad5686_channels,
> + .num_channels = 4,
> + },
> + [ID_AD5686R] = {
> + .channels = ad5686_channels,
> .int_vref_mv = 2500,
> + .num_channels = 4,
> },
> };
>
> -
> static int ad5686_probe(struct spi_device *spi)
> {
> struct ad5686_state *st;
> @@ -354,8 +400,8 @@ static int ad5686_probe(struct spi_device *spi)
> indio_dev->name = spi_get_device_id(spi)->name;
> indio_dev->info = &ad5686_info;
> indio_dev->modes = INDIO_DIRECT_MODE;
> - indio_dev->channels = st->chip_info->channel;
> - indio_dev->num_channels = AD5686_DAC_CHANNELS;
> + indio_dev->channels = st->chip_info->channels;
> + indio_dev->num_channels = st->chip_info->num_channels;
>
> ret = ad5686_spi_write(st, AD5686_CMD_INTERNAL_REFER_SETUP, 0,
> !!voltage_uv, 0);
> @@ -387,9 +433,14 @@ static int ad5686_remove(struct spi_device *spi)
> }
>
> static const struct spi_device_id ad5686_id[] = {
> + {"ad5672r", ID_AD5672R},
> + {"ad5676", ID_AD5676},
> + {"ad5676r", ID_AD5676R},
> {"ad5684", ID_AD5684},
> - {"ad5685", ID_AD5685},
> + {"ad5684r", ID_AD5684R},
> + {"ad5685r", ID_AD5685R},
> {"ad5686", ID_AD5686},
> + {"ad5686r", ID_AD5686R},
> {}
> };
> MODULE_DEVICE_TABLE(spi, ad5686_id);
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