| /* |
| * 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"); |