diff options
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/iio/adc/ad7793.c | 25 | ||||
| -rw-r--r-- | drivers/staging/iio/adc/ad7793.h | 107 |
2 files changed, 123 insertions, 9 deletions
diff --git a/drivers/staging/iio/adc/ad7793.c b/drivers/staging/iio/adc/ad7793.c index 843550ddc2ea..ec0fbd43f4ee 100644 --- a/drivers/staging/iio/adc/ad7793.c +++ b/drivers/staging/iio/adc/ad7793.c @@ -118,6 +118,12 @@ static int ad7793_setup(struct iio_dev *indio_dev, unsigned long long scale_uv; u32 id; + if ((pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT1 || + pdata->current_source_direction == AD7793_IEXEC1_IEXEC2_IOUT2) && + ((pdata->exitation_current != AD7793_IX_10uA) && + (pdata->exitation_current != AD7793_IX_210uA))) + return -EINVAL; + /* reset the serial interface */ ret = spi_write(st->sd.spi, (u8 *)&ret, sizeof(ret)); if (ret < 0) @@ -136,8 +142,18 @@ static int ad7793_setup(struct iio_dev *indio_dev, goto out; } - st->mode = pdata->mode; - st->conf = pdata->conf; + st->mode = AD7793_MODE_RATE(1); + st->mode |= AD7793_MODE_CLKSRC(pdata->clock_src); + st->conf = AD7793_CONF_REFSEL(pdata->refsel); + st->conf |= AD7793_CONF_VBIAS(pdata->bias_voltage); + if (pdata->buffered) + st->conf |= AD7793_CONF_BUF; + if (pdata->boost_enable) + st->conf |= AD7793_CONF_BOOST; + if (pdata->burnout_current) + st->conf |= AD7793_CONF_BO_EN; + if (pdata->unipolar) + st->conf |= AD7793_CONF_UNIPOLAR; ret = ad7793_set_mode(&st->sd, AD_SD_MODE_IDLE); if (ret) @@ -147,8 +163,9 @@ static int ad7793_setup(struct iio_dev *indio_dev, if (ret) goto out; - ret = ad_sd_write_reg(&st->sd, AD7793_REG_IO, - sizeof(pdata->io), pdata->io); + ret = ad_sd_write_reg(&st->sd, AD7793_REG_IO, 1, + pdata->exitation_current | + (pdata->current_source_direction << 2)); if (ret) goto out; diff --git a/drivers/staging/iio/adc/ad7793.h b/drivers/staging/iio/adc/ad7793.h index 8fdd450a2cd9..9e905906da2f 100644 --- a/drivers/staging/iio/adc/ad7793.h +++ b/drivers/staging/iio/adc/ad7793.h @@ -68,7 +68,7 @@ #define AD7793_CONF_UNIPOLAR (1 << 12) /* Unipolar/Bipolar Enable */ #define AD7793_CONF_BOOST (1 << 11) /* Boost Enable */ #define AD7793_CONF_GAIN(x) (((x) & 0x7) << 8) /* Gain Select */ -#define AD7793_CONF_REFSEL (1 << 7) /* INT/EXT Reference Select */ +#define AD7793_CONF_REFSEL(x) ((x) << 6) /* INT/EXT Reference Select */ #define AD7793_CONF_BUF (1 << 4) /* Buffered Mode Enable */ #define AD7793_CONF_CHAN(x) ((x) & 0xf) /* Channel select */ #define AD7793_CONF_CHAN_MASK 0xf /* Channel select mask */ @@ -105,11 +105,108 @@ #define AD7793_IO_IXCEN_210uA (2 << 0) /* Excitation Current 210uA */ #define AD7793_IO_IXCEN_1mA (3 << 0) /* Excitation Current 1mA */ +/** + * enum ad7793_clock_source - AD7793 clock source selection + * @AD7793_CLK_SRC_INT: Internal 64 kHz clock, not available at the CLK pin. + * @AD7793_CLK_SRC_INT_CO: Internal 64 kHz clock, available at the CLK pin. + * @AD7793_CLK_SRC_EXT: Use external clock. + * @AD7793_CLK_SRC_EXT_DIV2: Use external clock divided by 2. + */ +enum ad7793_clock_source { + AD7793_CLK_SRC_INT, + AD7793_CLK_SRC_INT_CO, + AD7793_CLK_SRC_EXT, + AD7793_CLK_SRC_EXT_DIV2, +}; + +/** + * enum ad7793_bias_voltage - AD7793 bias voltage selection + * @AD7793_BIAS_VOLTAGE_DISABLED: Bias voltage generator disabled + * @AD7793_BIAS_VOLTAGE_AIN1: Bias voltage connected to AIN1(-). + * @AD7793_BIAS_VOLTAGE_AIN2: Bias voltage connected to AIN2(-). + * @AD7793_BIAS_VOLTAGE_AIN3: Bias voltage connected to AIN3(-). + * Only valid for AD7795/AD7796. + */ +enum ad7793_bias_voltage { + AD7793_BIAS_VOLTAGE_DISABLED, + AD7793_BIAS_VOLTAGE_AIN1, + AD7793_BIAS_VOLTAGE_AIN2, + AD7793_BIAS_VOLTAGE_AIN3, +}; + +/** + * enum ad7793_refsel - AD7793 reference voltage selection + * @AD7793_REFSEL_REFIN1: External reference applied between REFIN1(+) + * and REFIN1(-). + * @AD7793_REFSEL_REFIN2: External reference applied between REFIN2(+) and + * and REFIN1(-). Only valid for AD7795/AD7796. + * @AD7793_REFSEL_INTERNAL: Internal 1.17 V reference. + */ +enum ad7793_refsel { + AD7793_REFSEL_REFIN1 = 0, + AD7793_REFSEL_REFIN2 = 1, + AD7793_REFSEL_INTERNAL = 2, +}; + +/** + * enum ad7793_current_source_direction - AD7793 excitation current direction + * @AD7793_IEXEC1_IOUT1_IEXEC2_IOUT2: Current source IEXC1 connected to pin + * IOUT1, current source IEXC2 connected to pin IOUT2. + * @AD7793_IEXEC1_IOUT2_IEXEC2_IOUT1: Current source IEXC2 connected to pin + * IOUT1, current source IEXC1 connected to pin IOUT2. + * @AD7793_IEXEC1_IEXEC2_IOUT1: Both current sources connected to pin IOUT1. + * Only valid when the current sources are set to 10 uA or 210 uA. + * @AD7793_IEXEC1_IEXEC2_IOUT2: Both current sources connected to Pin IOUT2. + * Only valid when the current ources are set to 10 uA or 210 uA. + */ +enum ad7793_current_source_direction { + AD7793_IEXEC1_IOUT1_IEXEC2_IOUT2 = 0, + AD7793_IEXEC1_IOUT2_IEXEC2_IOUT1 = 1, + AD7793_IEXEC1_IEXEC2_IOUT1 = 2, + AD7793_IEXEC1_IEXEC2_IOUT2 = 3, +}; + +/** + * enum ad7793_excitation_current - AD7793 excitation current selection + * @AD7793_IX_DISABLED: Excitation current Disabled. + * @AD7793_IX_10uA: Enable 10 micro-ampere excitation current. + * @AD7793_IX_210uA: Enable 210 micro-ampere excitation current. + * @AD7793_IX_1mA: Enable 1 milli-Ampere excitation current. + */ +enum ad7793_excitation_current { + AD7793_IX_DISABLED = 0, + AD7793_IX_10uA = 1, + AD7793_IX_210uA = 2, + AD7793_IX_1mA = 3, +}; + +/** + * struct ad7793_platform_data - AD7793 platform data + * @vref_mv: Reference voltage in milli-Volt + * @clock_src: Clock source selection + * @burnout_current: If set to true the 100nA burnout current is enabled. + * @boost_enable: Enable boost for the bias voltage generator. + * @buffered: If set to true configure the device for buffered input mode. + * @unipolar: If set to true sample in unipolar mode, if set to false sample in + * bipolar mode. + * @refsel: Reference voltage selection + * @bias_voltage: Bias voltage selection + * @exitation_current: Excitation current selection + * @current_source_direction: Excitation current direction selection + */ struct ad7793_platform_data { - u16 vref_mv; - u16 mode; - u16 conf; - u8 io; + u16 vref_mv; + + enum ad7793_clock_source clock_src; + bool burnout_current; + bool boost_enable; + bool buffered; + bool unipolar; + + enum ad7793_refsel refsel; + enum ad7793_bias_voltage bias_voltage; + enum ad7793_excitation_current exitation_current; + enum ad7793_current_source_direction current_source_direction; }; #endif /* IIO_ADC_AD7793_H_ */ |