diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/iio/adc/ad7793.c | 828 |
1 files changed, 828 insertions, 0 deletions
diff --git a/drivers/iio/adc/ad7793.c b/drivers/iio/adc/ad7793.c new file mode 100644 index 000000000..b5952ee30 --- /dev/null +++ b/drivers/iio/adc/ad7793.c @@ -0,0 +1,828 @@ +/* + * AD7785/AD7792/AD7793/AD7794/AD7795 SPI ADC driver + * + * Copyright 2011-2012 Analog Devices Inc. + * + * Licensed under the GPL-2. + */ + +#include <linux/interrupt.h> +#include <linux/device.h> +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/sysfs.h> +#include <linux/spi/spi.h> +#include <linux/regulator/consumer.h> +#include <linux/err.h> +#include <linux/sched.h> +#include <linux/delay.h> +#include <linux/module.h> + +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/buffer.h> +#include <linux/iio/trigger.h> +#include <linux/iio/trigger_consumer.h> +#include <linux/iio/triggered_buffer.h> +#include <linux/iio/adc/ad_sigma_delta.h> +#include <linux/platform_data/ad7793.h> + +/* Registers */ +#define AD7793_REG_COMM 0 /* Communications Register (WO, 8-bit) */ +#define AD7793_REG_STAT 0 /* Status Register (RO, 8-bit) */ +#define AD7793_REG_MODE 1 /* Mode Register (RW, 16-bit */ +#define AD7793_REG_CONF 2 /* Configuration Register (RW, 16-bit) */ +#define AD7793_REG_DATA 3 /* Data Register (RO, 16-/24-bit) */ +#define AD7793_REG_ID 4 /* ID Register (RO, 8-bit) */ +#define AD7793_REG_IO 5 /* IO Register (RO, 8-bit) */ +#define AD7793_REG_OFFSET 6 /* Offset Register (RW, 16-bit + * (AD7792)/24-bit (AD7793)) */ +#define AD7793_REG_FULLSALE 7 /* Full-Scale Register + * (RW, 16-bit (AD7792)/24-bit (AD7793)) */ + +/* Communications Register Bit Designations (AD7793_REG_COMM) */ +#define AD7793_COMM_WEN (1 << 7) /* Write Enable */ +#define AD7793_COMM_WRITE (0 << 6) /* Write Operation */ +#define AD7793_COMM_READ (1 << 6) /* Read Operation */ +#define AD7793_COMM_ADDR(x) (((x) & 0x7) << 3) /* Register Address */ +#define AD7793_COMM_CREAD (1 << 2) /* Continuous Read of Data Register */ + +/* Status Register Bit Designations (AD7793_REG_STAT) */ +#define AD7793_STAT_RDY (1 << 7) /* Ready */ +#define AD7793_STAT_ERR (1 << 6) /* Error (Overrange, Underrange) */ +#define AD7793_STAT_CH3 (1 << 2) /* Channel 3 */ +#define AD7793_STAT_CH2 (1 << 1) /* Channel 2 */ +#define AD7793_STAT_CH1 (1 << 0) /* Channel 1 */ + +/* Mode Register Bit Designations (AD7793_REG_MODE) */ +#define AD7793_MODE_SEL(x) (((x) & 0x7) << 13) /* Operation Mode Select */ +#define AD7793_MODE_SEL_MASK (0x7 << 13) /* Operation Mode Select mask */ +#define AD7793_MODE_CLKSRC(x) (((x) & 0x3) << 6) /* ADC Clock Source Select */ +#define AD7793_MODE_RATE(x) ((x) & 0xF) /* Filter Update Rate Select */ + +#define AD7793_MODE_CONT 0 /* Continuous Conversion Mode */ +#define AD7793_MODE_SINGLE 1 /* Single Conversion Mode */ +#define AD7793_MODE_IDLE 2 /* Idle Mode */ +#define AD7793_MODE_PWRDN 3 /* Power-Down Mode */ +#define AD7793_MODE_CAL_INT_ZERO 4 /* Internal Zero-Scale Calibration */ +#define AD7793_MODE_CAL_INT_FULL 5 /* Internal Full-Scale Calibration */ +#define AD7793_MODE_CAL_SYS_ZERO 6 /* System Zero-Scale Calibration */ +#define AD7793_MODE_CAL_SYS_FULL 7 /* System Full-Scale Calibration */ + +#define AD7793_CLK_INT 0 /* Internal 64 kHz Clock not + * available at the CLK pin */ +#define AD7793_CLK_INT_CO 1 /* Internal 64 kHz Clock available + * at the CLK pin */ +#define AD7793_CLK_EXT 2 /* External 64 kHz Clock */ +#define AD7793_CLK_EXT_DIV2 3 /* External Clock divided by 2 */ + +/* Configuration Register Bit Designations (AD7793_REG_CONF) */ +#define AD7793_CONF_VBIAS(x) (((x) & 0x3) << 14) /* Bias Voltage + * Generator Enable */ +#define AD7793_CONF_BO_EN (1 << 13) /* Burnout Current Enable */ +#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(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 */ + +#define AD7793_CH_AIN1P_AIN1M 0 /* AIN1(+) - AIN1(-) */ +#define AD7793_CH_AIN2P_AIN2M 1 /* AIN2(+) - AIN2(-) */ +#define AD7793_CH_AIN3P_AIN3M 2 /* AIN3(+) - AIN3(-) */ +#define AD7793_CH_AIN1M_AIN1M 3 /* AIN1(-) - AIN1(-) */ +#define AD7793_CH_TEMP 6 /* Temp Sensor */ +#define AD7793_CH_AVDD_MONITOR 7 /* AVDD Monitor */ + +#define AD7795_CH_AIN4P_AIN4M 4 /* AIN4(+) - AIN4(-) */ +#define AD7795_CH_AIN5P_AIN5M 5 /* AIN5(+) - AIN5(-) */ +#define AD7795_CH_AIN6P_AIN6M 6 /* AIN6(+) - AIN6(-) */ +#define AD7795_CH_AIN1M_AIN1M 8 /* AIN1(-) - AIN1(-) */ + +/* ID Register Bit Designations (AD7793_REG_ID) */ +#define AD7785_ID 0x3 +#define AD7792_ID 0xA +#define AD7793_ID 0xB +#define AD7794_ID 0xF +#define AD7795_ID 0xF +#define AD7796_ID 0xA +#define AD7797_ID 0xB +#define AD7798_ID 0x8 +#define AD7799_ID 0x9 +#define AD7793_ID_MASK 0xF + +/* IO (Excitation Current Sources) Register Bit Designations (AD7793_REG_IO) */ +#define AD7793_IO_IEXC1_IOUT1_IEXC2_IOUT2 0 /* IEXC1 connect to IOUT1, + * IEXC2 connect to IOUT2 */ +#define AD7793_IO_IEXC1_IOUT2_IEXC2_IOUT1 1 /* IEXC1 connect to IOUT2, + * IEXC2 connect to IOUT1 */ +#define AD7793_IO_IEXC1_IEXC2_IOUT1 2 /* Both current sources + * IEXC1,2 connect to IOUT1 */ +#define AD7793_IO_IEXC1_IEXC2_IOUT2 3 /* Both current sources + * IEXC1,2 connect to IOUT2 */ + +#define AD7793_IO_IXCEN_10uA (1 << 0) /* Excitation Current 10uA */ +#define AD7793_IO_IXCEN_210uA (2 << 0) /* Excitation Current 210uA */ +#define AD7793_IO_IXCEN_1mA (3 << 0) /* Excitation Current 1mA */ + +/* NOTE: + * The AD7792/AD7793 features a dual use data out ready DOUT/RDY output. + * In order to avoid contentions on the SPI bus, it's therefore necessary + * to use spi bus locking. + * + * The DOUT/RDY output must also be wired to an interrupt capable GPIO. + */ + +#define AD7793_FLAG_HAS_CLKSEL BIT(0) +#define AD7793_FLAG_HAS_REFSEL BIT(1) +#define AD7793_FLAG_HAS_VBIAS BIT(2) +#define AD7793_HAS_EXITATION_CURRENT BIT(3) +#define AD7793_FLAG_HAS_GAIN BIT(4) +#define AD7793_FLAG_HAS_BUFFER BIT(5) + +struct ad7793_chip_info { + unsigned int id; + const struct iio_chan_spec *channels; + unsigned int num_channels; + unsigned int flags; + + const struct iio_info *iio_info; + const u16 *sample_freq_avail; +}; + +struct ad7793_state { + const struct ad7793_chip_info *chip_info; + struct regulator *reg; + u16 int_vref_mv; + u16 mode; + u16 conf; + u32 scale_avail[8][2]; + + struct ad_sigma_delta sd; + +}; + +enum ad7793_supported_device_ids { + ID_AD7785, + ID_AD7792, + ID_AD7793, + ID_AD7794, + ID_AD7795, + ID_AD7796, + ID_AD7797, + ID_AD7798, + ID_AD7799, +}; + +static struct ad7793_state *ad_sigma_delta_to_ad7793(struct ad_sigma_delta *sd) +{ + return container_of(sd, struct ad7793_state, sd); +} + +static int ad7793_set_channel(struct ad_sigma_delta *sd, unsigned int channel) +{ + struct ad7793_state *st = ad_sigma_delta_to_ad7793(sd); + + st->conf &= ~AD7793_CONF_CHAN_MASK; + st->conf |= AD7793_CONF_CHAN(channel); + + return ad_sd_write_reg(&st->sd, AD7793_REG_CONF, 2, st->conf); +} + +static int ad7793_set_mode(struct ad_sigma_delta *sd, + enum ad_sigma_delta_mode mode) +{ + struct ad7793_state *st = ad_sigma_delta_to_ad7793(sd); + + st->mode &= ~AD7793_MODE_SEL_MASK; + st->mode |= AD7793_MODE_SEL(mode); + + return ad_sd_write_reg(&st->sd, AD7793_REG_MODE, 2, st->mode); +} + +static const struct ad_sigma_delta_info ad7793_sigma_delta_info = { + .set_channel = ad7793_set_channel, + .set_mode = ad7793_set_mode, + .has_registers = true, + .addr_shift = 3, + .read_mask = BIT(6), +}; + +static const struct ad_sd_calib_data ad7793_calib_arr[6] = { + {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN1P_AIN1M}, + {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN1P_AIN1M}, + {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN2P_AIN2M}, + {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN2P_AIN2M}, + {AD7793_MODE_CAL_INT_ZERO, AD7793_CH_AIN3P_AIN3M}, + {AD7793_MODE_CAL_INT_FULL, AD7793_CH_AIN3P_AIN3M} +}; + +static int ad7793_calibrate_all(struct ad7793_state *st) +{ + return ad_sd_calibrate_all(&st->sd, ad7793_calib_arr, + ARRAY_SIZE(ad7793_calib_arr)); +} + +static int ad7793_check_platform_data(struct ad7793_state *st, + const struct ad7793_platform_data *pdata) +{ + 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; + + if (!(st->chip_info->flags & AD7793_FLAG_HAS_CLKSEL) && + pdata->clock_src != AD7793_CLK_SRC_INT) + return -EINVAL; + + if (!(st->chip_info->flags & AD7793_FLAG_HAS_REFSEL) && + pdata->refsel != AD7793_REFSEL_REFIN1) + return -EINVAL; + + if (!(st->chip_info->flags & AD7793_FLAG_HAS_VBIAS) && + pdata->bias_voltage != AD7793_BIAS_VOLTAGE_DISABLED) + return -EINVAL; + + if (!(st->chip_info->flags & AD7793_HAS_EXITATION_CURRENT) && + pdata->exitation_current != AD7793_IX_DISABLED) + return -EINVAL; + + return 0; +} + +static int ad7793_setup(struct iio_dev *indio_dev, + const struct ad7793_platform_data *pdata, + unsigned int vref_mv) +{ + struct ad7793_state *st = iio_priv(indio_dev); + int i, ret; + unsigned long long scale_uv; + u32 id; + + ret = ad7793_check_platform_data(st, pdata); + if (ret) + return ret; + + /* reset the serial interface */ + ret = ad_sd_reset(&st->sd, 32); + if (ret < 0) + goto out; + usleep_range(500, 2000); /* Wait for at least 500us */ + + /* write/read test for device presence */ + ret = ad_sd_read_reg(&st->sd, AD7793_REG_ID, 1, &id); + if (ret) + goto out; + + id &= AD7793_ID_MASK; + + if (id != st->chip_info->id) { + ret = -ENODEV; + dev_err(&st->sd.spi->dev, "device ID query failed\n"); + goto out; + } + + st->mode = AD7793_MODE_RATE(1); + st->conf = 0; + + if (st->chip_info->flags & AD7793_FLAG_HAS_CLKSEL) + st->mode |= AD7793_MODE_CLKSRC(pdata->clock_src); + if (st->chip_info->flags & AD7793_FLAG_HAS_REFSEL) + st->conf |= AD7793_CONF_REFSEL(pdata->refsel); + if (st->chip_info->flags & AD7793_FLAG_HAS_VBIAS) + st->conf |= AD7793_CONF_VBIAS(pdata->bias_voltage); + if (pdata->buffered || !(st->chip_info->flags & AD7793_FLAG_HAS_BUFFER)) + st->conf |= AD7793_CONF_BUF; + if (pdata->boost_enable && + (st->chip_info->flags & AD7793_FLAG_HAS_VBIAS)) + st->conf |= AD7793_CONF_BOOST; + if (pdata->burnout_current) + st->conf |= AD7793_CONF_BO_EN; + if (pdata->unipolar) + st->conf |= AD7793_CONF_UNIPOLAR; + + if (!(st->chip_info->flags & AD7793_FLAG_HAS_GAIN)) + st->conf |= AD7793_CONF_GAIN(7); + + ret = ad7793_set_mode(&st->sd, AD_SD_MODE_IDLE); + if (ret) + goto out; + + ret = ad7793_set_channel(&st->sd, 0); + if (ret) + goto out; + + if (st->chip_info->flags & AD7793_HAS_EXITATION_CURRENT) { + ret = ad_sd_write_reg(&st->sd, AD7793_REG_IO, 1, + pdata->exitation_current | + (pdata->current_source_direction << 2)); + if (ret) + goto out; + } + + ret = ad7793_calibrate_all(st); + if (ret) + goto out; + + /* Populate available ADC input ranges */ + for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) { + scale_uv = ((u64)vref_mv * 100000000) + >> (st->chip_info->channels[0].scan_type.realbits - + (!!(st->conf & AD7793_CONF_UNIPOLAR) ? 0 : 1)); + scale_uv >>= i; + + st->scale_avail[i][1] = do_div(scale_uv, 100000000) * 10; + st->scale_avail[i][0] = scale_uv; + } + + return 0; +out: + dev_err(&st->sd.spi->dev, "setup failed\n"); + return ret; +} + +static const u16 ad7793_sample_freq_avail[16] = {0, 470, 242, 123, 62, 50, 39, + 33, 19, 17, 16, 12, 10, 8, 6, 4}; + +static const u16 ad7797_sample_freq_avail[16] = {0, 0, 0, 123, 62, 50, 0, + 33, 0, 17, 16, 12, 10, 8, 6, 4}; + +static IIO_CONST_ATTR_SAMP_FREQ_AVAIL( + "470 242 123 62 50 39 33 19 17 16 12 10 8 6 4"); + +static IIO_CONST_ATTR_NAMED(sampling_frequency_available_ad7797, + sampling_frequency_available, "123 62 50 33 17 16 12 10 8 6 4"); + +static ssize_t ad7793_show_scale_available(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct iio_dev *indio_dev = dev_to_iio_dev(dev); + struct ad7793_state *st = iio_priv(indio_dev); + int i, len = 0; + + for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) + len += sprintf(buf + len, "%d.%09u ", st->scale_avail[i][0], + st->scale_avail[i][1]); + + len += sprintf(buf + len, "\n"); + + return len; +} + +static IIO_DEVICE_ATTR_NAMED(in_m_in_scale_available, + in_voltage-voltage_scale_available, S_IRUGO, + ad7793_show_scale_available, NULL, 0); + +static struct attribute *ad7793_attributes[] = { + &iio_const_attr_sampling_frequency_available.dev_attr.attr, + &iio_dev_attr_in_m_in_scale_available.dev_attr.attr, + NULL +}; + +static const struct attribute_group ad7793_attribute_group = { + .attrs = ad7793_attributes, +}; + +static struct attribute *ad7797_attributes[] = { + &iio_const_attr_sampling_frequency_available_ad7797.dev_attr.attr, + NULL +}; + +static const struct attribute_group ad7797_attribute_group = { + .attrs = ad7797_attributes, +}; + +static int ad7793_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, + int *val2, + long m) +{ + struct ad7793_state *st = iio_priv(indio_dev); + int ret; + unsigned long long scale_uv; + bool unipolar = !!(st->conf & AD7793_CONF_UNIPOLAR); + + switch (m) { + case IIO_CHAN_INFO_RAW: + ret = ad_sigma_delta_single_conversion(indio_dev, chan, val); + if (ret < 0) + return ret; + + return IIO_VAL_INT; + + case IIO_CHAN_INFO_SCALE: + switch (chan->type) { + case IIO_VOLTAGE: + if (chan->differential) { + *val = st-> + scale_avail[(st->conf >> 8) & 0x7][0]; + *val2 = st-> + scale_avail[(st->conf >> 8) & 0x7][1]; + return IIO_VAL_INT_PLUS_NANO; + } + /* 1170mV / 2^23 * 6 */ + scale_uv = (1170ULL * 1000000000ULL * 6ULL); + break; + case IIO_TEMP: + /* 1170mV / 0.81 mV/C / 2^23 */ + scale_uv = 1444444444444444ULL; + break; + default: + return -EINVAL; + } + + scale_uv >>= (chan->scan_type.realbits - (unipolar ? 0 : 1)); + *val = 0; + *val2 = scale_uv; + return IIO_VAL_INT_PLUS_NANO; + case IIO_CHAN_INFO_OFFSET: + if (!unipolar) + *val = -(1 << (chan->scan_type.realbits - 1)); + else + *val = 0; + + /* Kelvin to Celsius */ + if (chan->type == IIO_TEMP) { + unsigned long long offset; + unsigned int shift; + + shift = chan->scan_type.realbits - (unipolar ? 0 : 1); + offset = 273ULL << shift; + do_div(offset, 1444); + *val -= offset; + } + return IIO_VAL_INT; + case IIO_CHAN_INFO_SAMP_FREQ: + *val = st->chip_info + ->sample_freq_avail[AD7793_MODE_RATE(st->mode)]; + return IIO_VAL_INT; + } + return -EINVAL; +} + +static int ad7793_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, + int val2, + long mask) +{ + struct ad7793_state *st = iio_priv(indio_dev); + int ret, i; + unsigned int tmp; + + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + + switch (mask) { + case IIO_CHAN_INFO_SCALE: + ret = -EINVAL; + for (i = 0; i < ARRAY_SIZE(st->scale_avail); i++) + if (val2 == st->scale_avail[i][1]) { + ret = 0; + tmp = st->conf; + st->conf &= ~AD7793_CONF_GAIN(-1); + st->conf |= AD7793_CONF_GAIN(i); + + if (tmp == st->conf) + break; + + ad_sd_write_reg(&st->sd, AD7793_REG_CONF, + sizeof(st->conf), st->conf); + ad7793_calibrate_all(st); + break; + } + break; + case IIO_CHAN_INFO_SAMP_FREQ: + if (!val) { + ret = -EINVAL; + break; + } + + for (i = 0; i < 16; i++) + if (val == st->chip_info->sample_freq_avail[i]) + break; + + if (i == 16) { + ret = -EINVAL; + break; + } + + st->mode &= ~AD7793_MODE_RATE(-1); + st->mode |= AD7793_MODE_RATE(i); + ad_sd_write_reg(&st->sd, AD7793_REG_MODE, sizeof(st->mode), + st->mode); + break; + default: + ret = -EINVAL; + } + + iio_device_release_direct_mode(indio_dev); + return ret; +} + +static int ad7793_write_raw_get_fmt(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + long mask) +{ + return IIO_VAL_INT_PLUS_NANO; +} + +static const struct iio_info ad7793_info = { + .read_raw = &ad7793_read_raw, + .write_raw = &ad7793_write_raw, + .write_raw_get_fmt = &ad7793_write_raw_get_fmt, + .attrs = &ad7793_attribute_group, + .validate_trigger = ad_sd_validate_trigger, +}; + +static const struct iio_info ad7797_info = { + .read_raw = &ad7793_read_raw, + .write_raw = &ad7793_write_raw, + .write_raw_get_fmt = &ad7793_write_raw_get_fmt, + .attrs = &ad7797_attribute_group, + .validate_trigger = ad_sd_validate_trigger, +}; + +#define DECLARE_AD7793_CHANNELS(_name, _b, _sb, _s) \ +const struct iio_chan_spec _name##_channels[] = { \ + AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), (_s)), \ + AD_SD_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), (_s)), \ + AD_SD_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), (_s)), \ + AD_SD_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), (_s)), \ + AD_SD_TEMP_CHANNEL(4, AD7793_CH_TEMP, (_b), (_sb), (_s)), \ + AD_SD_SUPPLY_CHANNEL(5, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), (_s)), \ + IIO_CHAN_SOFT_TIMESTAMP(6), \ +} + +#define DECLARE_AD7795_CHANNELS(_name, _b, _sb) \ +const struct iio_chan_spec _name##_channels[] = { \ + AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \ + AD_SD_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \ + AD_SD_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \ + AD_SD_DIFF_CHANNEL(3, 3, 3, AD7795_CH_AIN4P_AIN4M, (_b), (_sb), 0), \ + AD_SD_DIFF_CHANNEL(4, 4, 4, AD7795_CH_AIN5P_AIN5M, (_b), (_sb), 0), \ + AD_SD_DIFF_CHANNEL(5, 5, 5, AD7795_CH_AIN6P_AIN6M, (_b), (_sb), 0), \ + AD_SD_SHORTED_CHANNEL(6, 0, AD7795_CH_AIN1M_AIN1M, (_b), (_sb), 0), \ + AD_SD_TEMP_CHANNEL(7, AD7793_CH_TEMP, (_b), (_sb), 0), \ + AD_SD_SUPPLY_CHANNEL(8, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \ + IIO_CHAN_SOFT_TIMESTAMP(9), \ +} + +#define DECLARE_AD7797_CHANNELS(_name, _b, _sb) \ +const struct iio_chan_spec _name##_channels[] = { \ + AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \ + AD_SD_SHORTED_CHANNEL(1, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), 0), \ + AD_SD_TEMP_CHANNEL(2, AD7793_CH_TEMP, (_b), (_sb), 0), \ + AD_SD_SUPPLY_CHANNEL(3, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \ + IIO_CHAN_SOFT_TIMESTAMP(4), \ +} + +#define DECLARE_AD7799_CHANNELS(_name, _b, _sb) \ +const struct iio_chan_spec _name##_channels[] = { \ + AD_SD_DIFF_CHANNEL(0, 0, 0, AD7793_CH_AIN1P_AIN1M, (_b), (_sb), 0), \ + AD_SD_DIFF_CHANNEL(1, 1, 1, AD7793_CH_AIN2P_AIN2M, (_b), (_sb), 0), \ + AD_SD_DIFF_CHANNEL(2, 2, 2, AD7793_CH_AIN3P_AIN3M, (_b), (_sb), 0), \ + AD_SD_SHORTED_CHANNEL(3, 0, AD7793_CH_AIN1M_AIN1M, (_b), (_sb), 0), \ + AD_SD_SUPPLY_CHANNEL(4, 3, AD7793_CH_AVDD_MONITOR, (_b), (_sb), 0), \ + IIO_CHAN_SOFT_TIMESTAMP(5), \ +} + +static DECLARE_AD7793_CHANNELS(ad7785, 20, 32, 4); +static DECLARE_AD7793_CHANNELS(ad7792, 16, 32, 0); +static DECLARE_AD7793_CHANNELS(ad7793, 24, 32, 0); +static DECLARE_AD7795_CHANNELS(ad7794, 16, 32); +static DECLARE_AD7795_CHANNELS(ad7795, 24, 32); +static DECLARE_AD7797_CHANNELS(ad7796, 16, 16); +static DECLARE_AD7797_CHANNELS(ad7797, 24, 32); +static DECLARE_AD7799_CHANNELS(ad7798, 16, 16); +static DECLARE_AD7799_CHANNELS(ad7799, 24, 32); + +static const struct ad7793_chip_info ad7793_chip_info_tbl[] = { + [ID_AD7785] = { + .id = AD7785_ID, + .channels = ad7785_channels, + .num_channels = ARRAY_SIZE(ad7785_channels), + .iio_info = &ad7793_info, + .sample_freq_avail = ad7793_sample_freq_avail, + .flags = AD7793_FLAG_HAS_CLKSEL | + AD7793_FLAG_HAS_REFSEL | + AD7793_FLAG_HAS_VBIAS | + AD7793_HAS_EXITATION_CURRENT | + AD7793_FLAG_HAS_GAIN | + AD7793_FLAG_HAS_BUFFER, + }, + [ID_AD7792] = { + .id = AD7792_ID, + .channels = ad7792_channels, + .num_channels = ARRAY_SIZE(ad7792_channels), + .iio_info = &ad7793_info, + .sample_freq_avail = ad7793_sample_freq_avail, + .flags = AD7793_FLAG_HAS_CLKSEL | + AD7793_FLAG_HAS_REFSEL | + AD7793_FLAG_HAS_VBIAS | + AD7793_HAS_EXITATION_CURRENT | + AD7793_FLAG_HAS_GAIN | + AD7793_FLAG_HAS_BUFFER, + }, + [ID_AD7793] = { + .id = AD7793_ID, + .channels = ad7793_channels, + .num_channels = ARRAY_SIZE(ad7793_channels), + .iio_info = &ad7793_info, + .sample_freq_avail = ad7793_sample_freq_avail, + .flags = AD7793_FLAG_HAS_CLKSEL | + AD7793_FLAG_HAS_REFSEL | + AD7793_FLAG_HAS_VBIAS | + AD7793_HAS_EXITATION_CURRENT | + AD7793_FLAG_HAS_GAIN | + AD7793_FLAG_HAS_BUFFER, + }, + [ID_AD7794] = { + .id = AD7794_ID, + .channels = ad7794_channels, + .num_channels = ARRAY_SIZE(ad7794_channels), + .iio_info = &ad7793_info, + .sample_freq_avail = ad7793_sample_freq_avail, + .flags = AD7793_FLAG_HAS_CLKSEL | + AD7793_FLAG_HAS_REFSEL | + AD7793_FLAG_HAS_VBIAS | + AD7793_HAS_EXITATION_CURRENT | + AD7793_FLAG_HAS_GAIN | + AD7793_FLAG_HAS_BUFFER, + }, + [ID_AD7795] = { + .id = AD7795_ID, + .channels = ad7795_channels, + .num_channels = ARRAY_SIZE(ad7795_channels), + .iio_info = &ad7793_info, + .sample_freq_avail = ad7793_sample_freq_avail, + .flags = AD7793_FLAG_HAS_CLKSEL | + AD7793_FLAG_HAS_REFSEL | + AD7793_FLAG_HAS_VBIAS | + AD7793_HAS_EXITATION_CURRENT | + AD7793_FLAG_HAS_GAIN | + AD7793_FLAG_HAS_BUFFER, + }, + [ID_AD7796] = { + .id = AD7796_ID, + .channels = ad7796_channels, + .num_channels = ARRAY_SIZE(ad7796_channels), + .iio_info = &ad7797_info, + .sample_freq_avail = ad7797_sample_freq_avail, + .flags = AD7793_FLAG_HAS_CLKSEL, + }, + [ID_AD7797] = { + .id = AD7797_ID, + .channels = ad7797_channels, + .num_channels = ARRAY_SIZE(ad7797_channels), + .iio_info = &ad7797_info, + .sample_freq_avail = ad7797_sample_freq_avail, + .flags = AD7793_FLAG_HAS_CLKSEL, + }, + [ID_AD7798] = { + .id = AD7798_ID, + .channels = ad7798_channels, + .num_channels = ARRAY_SIZE(ad7798_channels), + .iio_info = &ad7793_info, + .sample_freq_avail = ad7793_sample_freq_avail, + .flags = AD7793_FLAG_HAS_GAIN | + AD7793_FLAG_HAS_BUFFER, + }, + [ID_AD7799] = { + .id = AD7799_ID, + .channels = ad7799_channels, + .num_channels = ARRAY_SIZE(ad7799_channels), + .iio_info = &ad7793_info, + .sample_freq_avail = ad7793_sample_freq_avail, + .flags = AD7793_FLAG_HAS_GAIN | + AD7793_FLAG_HAS_BUFFER, + }, +}; + +static int ad7793_probe(struct spi_device *spi) +{ + const struct ad7793_platform_data *pdata = spi->dev.platform_data; + struct ad7793_state *st; + struct iio_dev *indio_dev; + int ret, vref_mv = 0; + + if (!pdata) { + dev_err(&spi->dev, "no platform data?\n"); + return -ENODEV; + } + + if (!spi->irq) { + dev_err(&spi->dev, "no IRQ?\n"); + return -ENODEV; + } + + indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st)); + if (indio_dev == NULL) + return -ENOMEM; + + st = iio_priv(indio_dev); + + ad_sd_init(&st->sd, indio_dev, spi, &ad7793_sigma_delta_info); + + if (pdata->refsel != AD7793_REFSEL_INTERNAL) { + st->reg = devm_regulator_get(&spi->dev, "refin"); + if (IS_ERR(st->reg)) + return PTR_ERR(st->reg); + + ret = regulator_enable(st->reg); + if (ret) + return ret; + + vref_mv = regulator_get_voltage(st->reg); + if (vref_mv < 0) { + ret = vref_mv; + goto error_disable_reg; + } + + vref_mv /= 1000; + } else { + vref_mv = 1170; /* Build-in ref */ + } + + st->chip_info = + &ad7793_chip_info_tbl[spi_get_device_id(spi)->driver_data]; + + spi_set_drvdata(spi, indio_dev); + + indio_dev->dev.parent = &spi->dev; + indio_dev->dev.of_node = spi->dev.of_node; + indio_dev->name = spi_get_device_id(spi)->name; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = st->chip_info->channels; + indio_dev->num_channels = st->chip_info->num_channels; + indio_dev->info = st->chip_info->iio_info; + + ret = ad_sd_setup_buffer_and_trigger(indio_dev); + if (ret) + goto error_disable_reg; + + ret = ad7793_setup(indio_dev, pdata, vref_mv); + if (ret) + goto error_remove_trigger; + + ret = iio_device_register(indio_dev); + if (ret) + goto error_remove_trigger; + + return 0; + +error_remove_trigger: + ad_sd_cleanup_buffer_and_trigger(indio_dev); +error_disable_reg: + if (pdata->refsel != AD7793_REFSEL_INTERNAL) + regulator_disable(st->reg); + + return ret; +} + +static int ad7793_remove(struct spi_device *spi) +{ + const struct ad7793_platform_data *pdata = spi->dev.platform_data; + struct iio_dev *indio_dev = spi_get_drvdata(spi); + struct ad7793_state *st = iio_priv(indio_dev); + + iio_device_unregister(indio_dev); + ad_sd_cleanup_buffer_and_trigger(indio_dev); + + if (pdata->refsel != AD7793_REFSEL_INTERNAL) + regulator_disable(st->reg); + + return 0; +} + +static const struct spi_device_id ad7793_id[] = { + {"ad7785", ID_AD7785}, + {"ad7792", ID_AD7792}, + {"ad7793", ID_AD7793}, + {"ad7794", ID_AD7794}, + {"ad7795", ID_AD7795}, + {"ad7796", ID_AD7796}, + {"ad7797", ID_AD7797}, + {"ad7798", ID_AD7798}, + {"ad7799", ID_AD7799}, + {} +}; +MODULE_DEVICE_TABLE(spi, ad7793_id); + +static struct spi_driver ad7793_driver = { + .driver = { + .name = "ad7793", + }, + .probe = ad7793_probe, + .remove = ad7793_remove, + .id_table = ad7793_id, +}; +module_spi_driver(ad7793_driver); + +MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); +MODULE_DESCRIPTION("Analog Devices AD7793 and similar ADCs"); +MODULE_LICENSE("GPL v2"); |