From bb92ff3e54530f8a1a5e0c85eaeee350c9ee0f1a Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Tue, 21 Feb 2012 18:38:16 +0100 Subject: [PATCH] staging:iio:dac:ad5064: Add AD5628/AD5648/AD5668 support The AD5628/AD5648/AD5668 are similar to the AD5024/AD5044/AD5064. The difference being that they have an internal reference voltage and 8 instead of 4 DAC channels. Signed-off-by: Lars-Peter Clausen Acked-by: Jonathan Cameron Signed-off-by: Greg Kroah-Hartman --- drivers/staging/iio/dac/Kconfig | 5 +- drivers/staging/iio/dac/ad5064.c | 122 +++++++++++++++++++++++++++++++++------ 2 files changed, 107 insertions(+), 20 deletions(-) diff --git a/drivers/staging/iio/dac/Kconfig b/drivers/staging/iio/dac/Kconfig index 66b2504..ab8516d 100644 --- a/drivers/staging/iio/dac/Kconfig +++ b/drivers/staging/iio/dac/Kconfig @@ -4,11 +4,12 @@ menu "Digital to analog converters" config AD5064 - tristate "Analog Devices AD5064/64-1/65/44/45/24/25 DAC driver" + tristate "Analog Devices AD5064/64-1/65/44/45/24/25, AD5628/48/68 DAC driver" depends on SPI help Say yes here to build support for Analog Devices AD5024, AD5025, AD5044, - AD5045, AD5064, AD5064-1, AD5065 Digital to Analog Converter. + AD5045, AD5064, AD5064-1, AD5065, AD5628, AD5648, AD5668 Digital to Analog + Converter. To compile this driver as a module, choose M here: the module will be called ad5064. diff --git a/drivers/staging/iio/dac/ad5064.c b/drivers/staging/iio/dac/ad5064.c index 865e81f..6dab064 100644 --- a/drivers/staging/iio/dac/ad5064.c +++ b/drivers/staging/iio/dac/ad5064.c @@ -1,6 +1,6 @@ /* - * AD5024, AD5025, AD5044, AD5045, AD5064, AD5064-1 Digital to analog converters - * driver + * AD5024, AD5025, AD5044, AD5045, AD5064, AD5064-1, AD5065, AD5628, AD5648, + * AD5668 Digital to analog converters driver * * Copyright 2011 Analog Devices Inc. * @@ -20,7 +20,7 @@ #include "../sysfs.h" #include "dac.h" -#define AD5064_MAX_DAC_CHANNELS 4 +#define AD5064_MAX_DAC_CHANNELS 8 #define AD5064_MAX_VREFS 4 #define AD5064_ADDR(x) ((x) << 20) @@ -37,7 +37,10 @@ #define AD5064_CMD_CLEAR 0x5 #define AD5064_CMD_LDAC_MASK 0x6 #define AD5064_CMD_RESET 0x7 -#define AD5064_CMD_DAISY_CHAIN_ENABLE 0x8 +#define AD5064_CMD_CONFIG 0x8 + +#define AD5064_CONFIG_DAISY_CHAIN_ENABLE BIT(1) +#define AD5064_CONFIG_INT_VREF_ENABLE BIT(0) #define AD5064_LDAC_PWRDN_NONE 0x0 #define AD5064_LDAC_PWRDN_1K 0x1 @@ -47,12 +50,15 @@ /** * struct ad5064_chip_info - chip specific information * @shared_vref: whether the vref supply is shared between channels + * @internal_vref: internal reference voltage. 0 if the chip has no internal + * vref. * @channel: channel specification * @num_channels: number of channels */ struct ad5064_chip_info { bool shared_vref; + unsigned long internal_vref; const struct iio_chan_spec *channels; unsigned int num_channels; }; @@ -65,6 +71,8 @@ struct ad5064_chip_info { * @pwr_down: whether channel is powered down * @pwr_down_mode: channel's current power down mode * @dac_cache: current DAC raw value (chip does not support readback) + * @use_internal_vref: set to true if the internal reference voltage should be + * used. * @data: spi transfer buffers */ @@ -75,6 +83,7 @@ struct ad5064_state { bool pwr_down[AD5064_MAX_DAC_CHANNELS]; u8 pwr_down_mode[AD5064_MAX_DAC_CHANNELS]; unsigned int dac_cache[AD5064_MAX_DAC_CHANNELS]; + bool use_internal_vref; /* * DMA (thus cache coherency maintenance) requires the @@ -91,6 +100,12 @@ enum ad5064_type { ID_AD5064, ID_AD5064_1, ID_AD5065, + ID_AD5628_1, + ID_AD5628_2, + ID_AD5648_1, + ID_AD5648_2, + ID_AD5668_1, + ID_AD5668_2, }; static int ad5064_spi_write(struct ad5064_state *st, unsigned int cmd, @@ -196,6 +211,18 @@ static ssize_t ad5064_write_dac_powerdown(struct iio_dev *indio_dev, return ret ? ret : len; } +static int ad5064_get_vref(struct ad5064_state *st, + struct iio_chan_spec const *chan) +{ + unsigned int i; + + if (st->use_internal_vref) + return st->chip_info->internal_vref; + + i = st->chip_info->shared_vref ? 0 : chan->channel; + return regulator_get_voltage(st->vref_reg[i].consumer); +} + static int ad5064_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int *val, @@ -203,7 +230,6 @@ static int ad5064_read_raw(struct iio_dev *indio_dev, long m) { struct ad5064_state *st = iio_priv(indio_dev); - unsigned int vref; int scale_uv; switch (m) { @@ -211,8 +237,7 @@ static int ad5064_read_raw(struct iio_dev *indio_dev, *val = st->dac_cache[chan->channel]; return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: - vref = st->chip_info->shared_vref ? 0 : chan->channel; - scale_uv = regulator_get_voltage(st->vref_reg[vref].consumer); + scale_uv = ad5064_get_vref(st, chan); if (scale_uv < 0) return scale_uv; @@ -293,6 +318,10 @@ const struct iio_chan_spec name[] = { \ AD5064_CHANNEL(1, bits), \ AD5064_CHANNEL(2, bits), \ AD5064_CHANNEL(3, bits), \ + AD5064_CHANNEL(4, bits), \ + AD5064_CHANNEL(5, bits), \ + AD5064_CHANNEL(6, bits), \ + AD5064_CHANNEL(7, bits), \ } static DECLARE_AD5064_CHANNELS(ad5024_channels, 12); @@ -335,6 +364,42 @@ static const struct ad5064_chip_info ad5064_chip_info_tbl[] = { .channels = ad5064_channels, .num_channels = 2, }, + [ID_AD5628_1] = { + .shared_vref = true, + .internal_vref = 2500000, + .channels = ad5024_channels, + .num_channels = 8, + }, + [ID_AD5628_2] = { + .shared_vref = true, + .internal_vref = 5000000, + .channels = ad5024_channels, + .num_channels = 8, + }, + [ID_AD5648_1] = { + .shared_vref = true, + .internal_vref = 2500000, + .channels = ad5044_channels, + .num_channels = 8, + }, + [ID_AD5648_2] = { + .shared_vref = true, + .internal_vref = 5000000, + .channels = ad5044_channels, + .num_channels = 8, + }, + [ID_AD5668_1] = { + .shared_vref = true, + .internal_vref = 2500000, + .channels = ad5064_channels, + .num_channels = 8, + }, + [ID_AD5668_2] = { + .shared_vref = true, + .internal_vref = 5000000, + .channels = ad5064_channels, + .num_channels = 8, + }, }; static inline unsigned int ad5064_num_vref(struct ad5064_state *st) @@ -378,12 +443,22 @@ static int __devinit ad5064_probe(struct spi_device *spi) ret = regulator_bulk_get(&st->spi->dev, ad5064_num_vref(st), st->vref_reg); - if (ret) - goto error_free; - - ret = regulator_bulk_enable(ad5064_num_vref(st), st->vref_reg); - if (ret) - goto error_free_reg; + if (ret) { + if (!st->chip_info->internal_vref) + goto error_free; + st->use_internal_vref = true; + ret = ad5064_spi_write(st, AD5064_CMD_CONFIG, 0, + AD5064_CONFIG_INT_VREF_ENABLE, 0); + if (ret) { + dev_err(&spi->dev, "Failed to enable internal vref: %d\n", + ret); + goto error_free; + } + } else { + ret = regulator_bulk_enable(ad5064_num_vref(st), st->vref_reg); + if (ret) + goto error_free_reg; + } for (i = 0; i < st->chip_info->num_channels; ++i) { st->pwr_down_mode[i] = AD5064_LDAC_PWRDN_1K; @@ -404,9 +479,11 @@ static int __devinit ad5064_probe(struct spi_device *spi) return 0; error_disable_reg: - regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg); + if (!st->use_internal_vref) + regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg); error_free_reg: - regulator_bulk_free(ad5064_num_vref(st), st->vref_reg); + if (!st->use_internal_vref) + regulator_bulk_free(ad5064_num_vref(st), st->vref_reg); error_free: iio_free_device(indio_dev); @@ -421,8 +498,10 @@ static int __devexit ad5064_remove(struct spi_device *spi) iio_device_unregister(indio_dev); - regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg); - regulator_bulk_free(ad5064_num_vref(st), st->vref_reg); + if (!st->use_internal_vref) { + regulator_bulk_disable(ad5064_num_vref(st), st->vref_reg); + regulator_bulk_free(ad5064_num_vref(st), st->vref_reg); + } iio_free_device(indio_dev); @@ -437,6 +516,13 @@ static const struct spi_device_id ad5064_id[] = { {"ad5064", ID_AD5064}, {"ad5064-1", ID_AD5064_1}, {"ad5065", ID_AD5065}, + {"ad5628-1", ID_AD5628_1}, + {"ad5628-2", ID_AD5628_2}, + {"ad5648-1", ID_AD5648_1}, + {"ad5648-2", ID_AD5648_2}, + {"ad5668-1", ID_AD5668_1}, + {"ad5668-2", ID_AD5668_2}, + {"ad5668-3", ID_AD5668_2}, /* similar enough to ad5668-2 */ {} }; MODULE_DEVICE_TABLE(spi, ad5064_id); @@ -453,5 +539,5 @@ static struct spi_driver ad5064_driver = { module_spi_driver(ad5064_driver); MODULE_AUTHOR("Lars-Peter Clausen "); -MODULE_DESCRIPTION("Analog Devices AD5024/25/44/45/64/64-1/65 DAC"); +MODULE_DESCRIPTION("Analog Devices AD5024/25/44/45/64/64-1/65, AD5628/48/68 DAC"); MODULE_LICENSE("GPL v2"); -- 2.7.4