The AD5681R/AD5682R/AD5683/AD5683R 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 similar to AD5691R/AD5692R/AD5693/AD5693R except with a few notable differences: * they use the SPI interface instead of I2C * in the write control register, DB18 and DB17 are used for setting the power mode, while DB16 is the REF bit. This is why a new regmap type was defined and checked accordingly. * the shift register is 24 bits wide, the first four bits are the command bits followed by the data bits. As the data comprises of 20-bit, 18-bit or 16-bit input code, this means that 4 LSB bits are don't care. This is why the data needs to be shifted on the left with four bits. Therefore, AD5683_REGMAP is checked inside a switch case in the ad5686_spi_write() function. On the other hand, similar devices such as AD5693R family, have the 4 MSB command bits followed by 4 don't care bits. Datasheet: http://www.analog.com/media/en/technical-documentation/data-sheets/AD5683R_5682R_5681R_5683.pdf Signed-off-by: Stefan Popa <stefan.popa@xxxxxxxxxx> --- Changes in v2: - Nothing changed, just to follow the patch set version. drivers/iio/dac/ad5686-spi.c | 42 ++++++++++++++++++++++++++++++++++-------- drivers/iio/dac/ad5686.c | 32 ++++++++++++++++++++++++++++++++ drivers/iio/dac/ad5686.h | 8 ++++++++ 3 files changed, 74 insertions(+), 8 deletions(-) diff --git a/drivers/iio/dac/ad5686-spi.c b/drivers/iio/dac/ad5686-spi.c index 6bb09e9..1df9143 100644 --- a/drivers/iio/dac/ad5686-spi.c +++ b/drivers/iio/dac/ad5686-spi.c @@ -1,6 +1,7 @@ // SPDX-License-Identifier: GPL-2.0+ /* - * AD5672R, AD5676, AD5676R, AD5684, AD5684R, AD5684R, AD5685R, AD5686, AD5686R + * AD5672R, AD5676, AD5676R, AD5681R, AD5682R, AD5683, AD5683R, + * AD5684, AD5684R, AD5685R, AD5686, AD5686R * Digital to analog converters driver * * Copyright 2018 Analog Devices Inc. @@ -15,12 +16,27 @@ static int ad5686_spi_write(struct ad5686_state *st, u8 cmd, u8 addr, u16 val) { struct spi_device *spi = to_spi_device(st->dev); - - st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | - AD5686_ADDR(addr) | - val); - - return spi_write(spi, &st->data[0].d8[1], 3); + u8 tx_len, *buf; + + switch (st->chip_info->regmap_type) { + case AD5683_REGMAP: + st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | + AD5683_DATA(val)); + buf = &st->data[0].d8[1]; + tx_len = 3; + break; + case AD5686_REGMAP: + st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | + AD5686_ADDR(addr) | + val); + buf = &st->data[0].d8[1]; + tx_len = 3; + break; + default: + return -EINVAL; + } + + return spi_write(spi, buf, tx_len); } static int ad5686_spi_read(struct ad5686_state *st, u8 addr) @@ -37,9 +53,15 @@ static int ad5686_spi_read(struct ad5686_state *st, u8 addr) }, }; struct spi_device *spi = to_spi_device(st->dev); + u8 cmd = 0; int ret; - st->data[0].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_READBACK_ENABLE) | + if (st->chip_info->regmap_type == AD5686_REGMAP) + cmd = AD5686_CMD_READBACK_ENABLE; + else if (st->chip_info->regmap_type == AD5683_REGMAP) + cmd = AD5686_CMD_READBACK_ENABLE_V2; + + st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | AD5686_ADDR(addr)); st->data[1].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP)); @@ -67,6 +89,10 @@ static const struct spi_device_id ad5686_spi_id[] = { {"ad5672r", ID_AD5672R}, {"ad5676", ID_AD5676}, {"ad5676r", ID_AD5676R}, + {"ad5681r", ID_AD5681R}, + {"ad5682r", ID_AD5682R}, + {"ad5683", ID_AD5683}, + {"ad5683r", ID_AD5683R}, {"ad5684", ID_AD5684}, {"ad5684r", ID_AD5684R}, {"ad5685", ID_AD5685R}, /* Does not exist */ diff --git a/drivers/iio/dac/ad5686.c b/drivers/iio/dac/ad5686.c index 1fc0c56..e136f0f 100644 --- a/drivers/iio/dac/ad5686.c +++ b/drivers/iio/dac/ad5686.c @@ -83,6 +83,10 @@ static ssize_t ad5686_write_dac_powerdown(struct iio_dev *indio_dev, st->pwr_down_mask &= ~(0x3 << (chan->channel * 2)); switch (st->chip_info->regmap_type) { + case AD5683_REGMAP: + shift = 13; + ref_bit_msk = AD5683_REF_BIT_MSK; + break; case AD5686_REGMAP: shift = 0; ref_bit_msk = 0; @@ -256,6 +260,29 @@ static const struct ad5686_chip_info ad5686_chip_info_tbl[] = { .num_channels = 8, .regmap_type = AD5686_REGMAP, }, + [ID_AD5681R] = { + .channels = ad5691r_channels, + .int_vref_mv = 2500, + .num_channels = 1, + .regmap_type = AD5683_REGMAP, + }, + [ID_AD5682R] = { + .channels = ad5692r_channels, + .int_vref_mv = 2500, + .num_channels = 1, + .regmap_type = AD5683_REGMAP, + }, + [ID_AD5683] = { + .channels = ad5693_channels, + .num_channels = 1, + .regmap_type = AD5683_REGMAP, + }, + [ID_AD5683R] = { + .channels = ad5693_channels, + .int_vref_mv = 2500, + .num_channels = 1, + .regmap_type = AD5683_REGMAP, + }, [ID_AD5684] = { .channels = ad5684_channels, .num_channels = 4, @@ -385,6 +412,11 @@ int ad5686_probe(struct device *dev, indio_dev->num_channels = st->chip_info->num_channels; switch (st->chip_info->regmap_type) { + case AD5683_REGMAP: + cmd = AD5686_CMD_CONTROL_REG; + ref_bit_msk = AD5683_REF_BIT_MSK; + st->use_internal_vref = !voltage_uv; + break; case AD5686_REGMAP: cmd = AD5686_CMD_INTERNAL_REFER_SETUP; ref_bit_msk = 0; diff --git a/drivers/iio/dac/ad5686.h b/drivers/iio/dac/ad5686.h index 6c6879d..d05cda9 100644 --- a/drivers/iio/dac/ad5686.h +++ b/drivers/iio/dac/ad5686.h @@ -13,6 +13,7 @@ #include <linux/mutex.h> #include <linux/kernel.h> +#define AD5683_DATA(x) ((x) << 4) #define AD5686_ADDR(x) ((x) << 16) #define AD5686_CMD(x) ((x) << 20) @@ -36,6 +37,8 @@ #define AD5686_LDAC_PWRDN_3STATE 0x3 #define AD5686_CMD_CONTROL_REG 0x4 +#define AD5686_CMD_READBACK_ENABLE_V2 0x5 +#define AD5683_REF_BIT_MSK BIT(12) #define AD5693_REF_BIT_MSK BIT(12) /** @@ -47,6 +50,10 @@ enum ad5686_supported_device_ids { ID_AD5675R, ID_AD5676, ID_AD5676R, + ID_AD5681R, + ID_AD5682R, + ID_AD5683, + ID_AD5683R, ID_AD5684, ID_AD5684R, ID_AD5685R, @@ -64,6 +71,7 @@ enum ad5686_supported_device_ids { }; enum ad5686_regmap_type { + AD5683_REGMAP, AD5686_REGMAP, AD5693_REGMAP }; -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
