| /* |
| * AD7190 AD7192 AD7195 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/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 "ad7192.h" |
| |
| /* Registers */ |
| #define AD7192_REG_COMM 0 /* Communications Register (WO, 8-bit) */ |
| #define AD7192_REG_STAT 0 /* Status Register (RO, 8-bit) */ |
| #define AD7192_REG_MODE 1 /* Mode Register (RW, 24-bit */ |
| #define AD7192_REG_CONF 2 /* Configuration Register (RW, 24-bit) */ |
| #define AD7192_REG_DATA 3 /* Data Register (RO, 24/32-bit) */ |
| #define AD7192_REG_ID 4 /* ID Register (RO, 8-bit) */ |
| #define AD7192_REG_GPOCON 5 /* GPOCON Register (RO, 8-bit) */ |
| #define AD7192_REG_OFFSET 6 /* Offset Register (RW, 16-bit |
| * (AD7792)/24-bit (AD7192)) */ |
| #define AD7192_REG_FULLSALE 7 /* Full-Scale Register |
| * (RW, 16-bit (AD7792)/24-bit (AD7192)) */ |
| |
| /* Communications Register Bit Designations (AD7192_REG_COMM) */ |
| #define AD7192_COMM_WEN BIT(7) /* Write Enable */ |
| #define AD7192_COMM_WRITE 0 /* Write Operation */ |
| #define AD7192_COMM_READ BIT(6) /* Read Operation */ |
| #define AD7192_COMM_ADDR(x) (((x) & 0x7) << 3) /* Register Address */ |
| #define AD7192_COMM_CREAD BIT(2) /* Continuous Read of Data Register */ |
| |
| /* Status Register Bit Designations (AD7192_REG_STAT) */ |
| #define AD7192_STAT_RDY BIT(7) /* Ready */ |
| #define AD7192_STAT_ERR BIT(6) /* Error (Overrange, Underrange) */ |
| #define AD7192_STAT_NOREF BIT(5) /* Error no external reference */ |
| #define AD7192_STAT_PARITY BIT(4) /* Parity */ |
| #define AD7192_STAT_CH3 BIT(2) /* Channel 3 */ |
| #define AD7192_STAT_CH2 BIT(1) /* Channel 2 */ |
| #define AD7192_STAT_CH1 BIT(0) /* Channel 1 */ |
| |
| /* Mode Register Bit Designations (AD7192_REG_MODE) */ |
| #define AD7192_MODE_SEL(x) (((x) & 0x7) << 21) /* Operation Mode Select */ |
| #define AD7192_MODE_SEL_MASK (0x7 << 21) /* Operation Mode Select Mask */ |
| #define AD7192_MODE_DAT_STA BIT(20) /* Status Register transmission */ |
| #define AD7192_MODE_CLKSRC(x) (((x) & 0x3) << 18) /* Clock Source Select */ |
| #define AD7192_MODE_SINC3 BIT(15) /* SINC3 Filter Select */ |
| #define AD7192_MODE_ACX BIT(14) /* AC excitation enable(AD7195 only)*/ |
| #define AD7192_MODE_ENPAR BIT(13) /* Parity Enable */ |
| #define AD7192_MODE_CLKDIV BIT(12) /* Clock divide by 2 (AD7190/2 only)*/ |
| #define AD7192_MODE_SCYCLE BIT(11) /* Single cycle conversion */ |
| #define AD7192_MODE_REJ60 BIT(10) /* 50/60Hz notch filter */ |
| #define AD7192_MODE_RATE(x) ((x) & 0x3FF) /* Filter Update Rate Select */ |
| |
| /* Mode Register: AD7192_MODE_SEL options */ |
| #define AD7192_MODE_CONT 0 /* Continuous Conversion Mode */ |
| #define AD7192_MODE_SINGLE 1 /* Single Conversion Mode */ |
| #define AD7192_MODE_IDLE 2 /* Idle Mode */ |
| #define AD7192_MODE_PWRDN 3 /* Power-Down Mode */ |
| #define AD7192_MODE_CAL_INT_ZERO 4 /* Internal Zero-Scale Calibration */ |
| #define AD7192_MODE_CAL_INT_FULL 5 /* Internal Full-Scale Calibration */ |
| #define AD7192_MODE_CAL_SYS_ZERO 6 /* System Zero-Scale Calibration */ |
| #define AD7192_MODE_CAL_SYS_FULL 7 /* System Full-Scale Calibration */ |
| |
| /* Mode Register: AD7192_MODE_CLKSRC options */ |
| #define AD7192_CLK_EXT_MCLK1_2 0 /* External 4.92 MHz Clock connected |
| * from MCLK1 to MCLK2 */ |
| #define AD7192_CLK_EXT_MCLK2 1 /* External Clock applied to MCLK2 */ |
| #define AD7192_CLK_INT 2 /* Internal 4.92 MHz Clock not |
| * available at the MCLK2 pin */ |
| #define AD7192_CLK_INT_CO 3 /* Internal 4.92 MHz Clock available |
| * at the MCLK2 pin */ |
| |
| |
| /* Configuration Register Bit Designations (AD7192_REG_CONF) */ |
| |
| #define AD7192_CONF_CHOP BIT(23) /* CHOP enable */ |
| #define AD7192_CONF_REFSEL BIT(20) /* REFIN1/REFIN2 Reference Select */ |
| #define AD7192_CONF_CHAN(x) (((1 << (x)) & 0xFF) << 8) /* Channel select */ |
| #define AD7192_CONF_CHAN_MASK (0xFF << 8) /* Channel select mask */ |
| #define AD7192_CONF_BURN BIT(7) /* Burnout current enable */ |
| #define AD7192_CONF_REFDET BIT(6) /* Reference detect enable */ |
| #define AD7192_CONF_BUF BIT(4) /* Buffered Mode Enable */ |
| #define AD7192_CONF_UNIPOLAR BIT(3) /* Unipolar/Bipolar Enable */ |
| #define AD7192_CONF_GAIN(x) ((x) & 0x7) /* Gain Select */ |
| |
| #define AD7192_CH_AIN1P_AIN2M 0 /* AIN1(+) - AIN2(-) */ |
| #define AD7192_CH_AIN3P_AIN4M 1 /* AIN3(+) - AIN4(-) */ |
| #define AD7192_CH_TEMP 2 /* Temp Sensor */ |
| #define AD7192_CH_AIN2P_AIN2M 3 /* AIN2(+) - AIN2(-) */ |
| #define AD7192_CH_AIN1 4 /* AIN1 - AINCOM */ |
| #define AD7192_CH_AIN2 5 /* AIN2 - AINCOM */ |
| #define AD7192_CH_AIN3 6 /* AIN3 - AINCOM */ |
| #define AD7192_CH_AIN4 7 /* AIN4 - AINCOM */ |
| |
| /* ID Register Bit Designations (AD7192_REG_ID) */ |
| #define ID_AD7190 0x4 |
| #define ID_AD7192 0x0 |
| #define ID_AD7195 0x6 |
| #define AD7192_ID_MASK 0x0F |
| |
| /* GPOCON Register Bit Designations (AD7192_REG_GPOCON) */ |
| #define AD7192_GPOCON_BPDSW BIT(6) /* Bridge power-down switch enable */ |
| #define AD7192_GPOCON_GP32EN BIT(5) /* Digital Output P3 and P2 enable */ |
| #define AD7192_GPOCON_GP10EN BIT(4) /* Digital Output P1 and P0 enable */ |
| #define AD7192_GPOCON_P3DAT BIT(3) /* P3 state */ |
| #define AD7192_GPOCON_P2DAT BIT(2) /* P2 state */ |
| #define AD7192_GPOCON_P1DAT BIT(1) /* P1 state */ |
| #define AD7192_GPOCON_P0DAT BIT(0) /* P0 state */ |
| |
| #define AD7192_INT_FREQ_MHz 4915200 |
| |
| /* NOTE: |
| * The AD7190/2/5 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. |
| */ |
| |
| struct ad7192_state { |
| struct regulator *reg; |
| u16 int_vref_mv; |
| u32 mclk; |
| u32 f_order; |
| u32 mode; |
| u32 conf; |
| u32 scale_avail[8][2]; |
| u8 gpocon; |
| u8 devid; |
| |
| struct ad_sigma_delta sd; |
| }; |
| |
| static struct ad7192_state *ad_sigma_delta_to_ad7192(struct ad_sigma_delta *sd) |
| { |
| return container_of(sd, struct ad7192_state, sd); |
| } |
| |
| static int ad7192_set_channel(struct ad_sigma_delta *sd, unsigned int channel) |
| { |
| struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd); |
| |
| st->conf &= ~AD7192_CONF_CHAN_MASK; |
| st->conf |= AD7192_CONF_CHAN(channel); |
| |
| return ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf); |
| } |
| |
| static int ad7192_set_mode(struct ad_sigma_delta *sd, |
| enum ad_sigma_delta_mode mode) |
| { |
| struct ad7192_state *st = ad_sigma_delta_to_ad7192(sd); |
| |
| st->mode &= ~AD7192_MODE_SEL_MASK; |
| st->mode |= AD7192_MODE_SEL(mode); |
| |
| return ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode); |
| } |
| |
| static const struct ad_sigma_delta_info ad7192_sigma_delta_info = { |
| .set_channel = ad7192_set_channel, |
| .set_mode = ad7192_set_mode, |
| .has_registers = true, |
| .addr_shift = 3, |
| .read_mask = BIT(6), |
| }; |
| |
| static const struct ad_sd_calib_data ad7192_calib_arr[8] = { |
| {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN1}, |
| {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN1}, |
| {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN2}, |
| {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN2}, |
| {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN3}, |
| {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN3}, |
| {AD7192_MODE_CAL_INT_ZERO, AD7192_CH_AIN4}, |
| {AD7192_MODE_CAL_INT_FULL, AD7192_CH_AIN4} |
| }; |
| |
| static int ad7192_calibrate_all(struct ad7192_state *st) |
| { |
| return ad_sd_calibrate_all(&st->sd, ad7192_calib_arr, |
| ARRAY_SIZE(ad7192_calib_arr)); |
| } |
| |
| static int ad7192_setup(struct ad7192_state *st, |
| const struct ad7192_platform_data *pdata) |
| { |
| struct iio_dev *indio_dev = spi_get_drvdata(st->sd.spi); |
| unsigned long long scale_uv; |
| int i, ret, id; |
| u8 ones[6]; |
| |
| /* reset the serial interface */ |
| memset(&ones, 0xFF, 6); |
| ret = spi_write(st->sd.spi, &ones, 6); |
| if (ret < 0) |
| goto out; |
| usleep_range(500, 1000); /* Wait for at least 500us */ |
| |
| /* write/read test for device presence */ |
| ret = ad_sd_read_reg(&st->sd, AD7192_REG_ID, 1, &id); |
| if (ret) |
| goto out; |
| |
| id &= AD7192_ID_MASK; |
| |
| if (id != st->devid) |
| dev_warn(&st->sd.spi->dev, "device ID query failed (0x%X)\n", |
| id); |
| |
| switch (pdata->clock_source_sel) { |
| case AD7192_CLK_EXT_MCLK1_2: |
| case AD7192_CLK_EXT_MCLK2: |
| st->mclk = AD7192_INT_FREQ_MHz; |
| break; |
| case AD7192_CLK_INT: |
| case AD7192_CLK_INT_CO: |
| if (pdata->ext_clk_Hz) |
| st->mclk = pdata->ext_clk_Hz; |
| else |
| st->mclk = AD7192_INT_FREQ_MHz; |
| break; |
| default: |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| st->mode = AD7192_MODE_SEL(AD7192_MODE_IDLE) | |
| AD7192_MODE_CLKSRC(pdata->clock_source_sel) | |
| AD7192_MODE_RATE(480); |
| |
| st->conf = AD7192_CONF_GAIN(0); |
| |
| if (pdata->rej60_en) |
| st->mode |= AD7192_MODE_REJ60; |
| |
| if (pdata->sinc3_en) |
| st->mode |= AD7192_MODE_SINC3; |
| |
| if (pdata->refin2_en && (st->devid != ID_AD7195)) |
| st->conf |= AD7192_CONF_REFSEL; |
| |
| if (pdata->chop_en) { |
| st->conf |= AD7192_CONF_CHOP; |
| if (pdata->sinc3_en) |
| st->f_order = 3; /* SINC 3rd order */ |
| else |
| st->f_order = 4; /* SINC 4th order */ |
| } else { |
| st->f_order = 1; |
| } |
| |
| if (pdata->buf_en) |
| st->conf |= AD7192_CONF_BUF; |
| |
| if (pdata->unipolar_en) |
| st->conf |= AD7192_CONF_UNIPOLAR; |
| |
| if (pdata->burnout_curr_en) |
| st->conf |= AD7192_CONF_BURN; |
| |
| ret = ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode); |
| if (ret) |
| goto out; |
| |
| ret = ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf); |
| if (ret) |
| goto out; |
| |
| ret = ad7192_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)st->int_vref_mv * 100000000) |
| >> (indio_dev->channels[0].scan_type.realbits - |
| ((st->conf & AD7192_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 ssize_t ad7192_read_frequency(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| struct ad7192_state *st = iio_priv(indio_dev); |
| |
| return sprintf(buf, "%d\n", st->mclk / |
| (st->f_order * 1024 * AD7192_MODE_RATE(st->mode))); |
| } |
| |
| static ssize_t ad7192_write_frequency(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| struct ad7192_state *st = iio_priv(indio_dev); |
| unsigned long lval; |
| int div, ret; |
| |
| ret = kstrtoul(buf, 10, &lval); |
| if (ret) |
| return ret; |
| if (lval == 0) |
| return -EINVAL; |
| |
| mutex_lock(&indio_dev->mlock); |
| if (iio_buffer_enabled(indio_dev)) { |
| mutex_unlock(&indio_dev->mlock); |
| return -EBUSY; |
| } |
| |
| div = st->mclk / (lval * st->f_order * 1024); |
| if (div < 1 || div > 1023) { |
| ret = -EINVAL; |
| goto out; |
| } |
| |
| st->mode &= ~AD7192_MODE_RATE(-1); |
| st->mode |= AD7192_MODE_RATE(div); |
| ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode); |
| |
| out: |
| mutex_unlock(&indio_dev->mlock); |
| |
| return ret ? ret : len; |
| } |
| |
| static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO, |
| ad7192_read_frequency, |
| ad7192_write_frequency); |
| |
| static ssize_t |
| ad7192_show_scale_available(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| struct ad7192_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_v_m_v_scale_available, |
| in_voltage-voltage_scale_available, |
| S_IRUGO, ad7192_show_scale_available, NULL, 0); |
| |
| static IIO_DEVICE_ATTR(in_voltage_scale_available, S_IRUGO, |
| ad7192_show_scale_available, NULL, 0); |
| |
| static ssize_t ad7192_show_ac_excitation(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| struct ad7192_state *st = iio_priv(indio_dev); |
| |
| return sprintf(buf, "%d\n", !!(st->mode & AD7192_MODE_ACX)); |
| } |
| |
| static ssize_t ad7192_show_bridge_switch(struct device *dev, |
| struct device_attribute *attr, |
| char *buf) |
| { |
| struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| struct ad7192_state *st = iio_priv(indio_dev); |
| |
| return sprintf(buf, "%d\n", !!(st->gpocon & AD7192_GPOCON_BPDSW)); |
| } |
| |
| static ssize_t ad7192_set(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, |
| size_t len) |
| { |
| struct iio_dev *indio_dev = dev_to_iio_dev(dev); |
| struct ad7192_state *st = iio_priv(indio_dev); |
| struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); |
| int ret; |
| bool val; |
| |
| ret = strtobool(buf, &val); |
| if (ret < 0) |
| return ret; |
| |
| mutex_lock(&indio_dev->mlock); |
| if (iio_buffer_enabled(indio_dev)) { |
| mutex_unlock(&indio_dev->mlock); |
| return -EBUSY; |
| } |
| |
| switch ((u32) this_attr->address) { |
| case AD7192_REG_GPOCON: |
| if (val) |
| st->gpocon |= AD7192_GPOCON_BPDSW; |
| else |
| st->gpocon &= ~AD7192_GPOCON_BPDSW; |
| |
| ad_sd_write_reg(&st->sd, AD7192_REG_GPOCON, 1, st->gpocon); |
| break; |
| case AD7192_REG_MODE: |
| if (val) |
| st->mode |= AD7192_MODE_ACX; |
| else |
| st->mode &= ~AD7192_MODE_ACX; |
| |
| ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode); |
| break; |
| default: |
| ret = -EINVAL; |
| } |
| |
| mutex_unlock(&indio_dev->mlock); |
| |
| return ret ? ret : len; |
| } |
| |
| static IIO_DEVICE_ATTR(bridge_switch_en, S_IRUGO | S_IWUSR, |
| ad7192_show_bridge_switch, ad7192_set, |
| AD7192_REG_GPOCON); |
| |
| static IIO_DEVICE_ATTR(ac_excitation_en, S_IRUGO | S_IWUSR, |
| ad7192_show_ac_excitation, ad7192_set, |
| AD7192_REG_MODE); |
| |
| static struct attribute *ad7192_attributes[] = { |
| &iio_dev_attr_sampling_frequency.dev_attr.attr, |
| &iio_dev_attr_in_v_m_v_scale_available.dev_attr.attr, |
| &iio_dev_attr_in_voltage_scale_available.dev_attr.attr, |
| &iio_dev_attr_bridge_switch_en.dev_attr.attr, |
| &iio_dev_attr_ac_excitation_en.dev_attr.attr, |
| NULL |
| }; |
| |
| static const struct attribute_group ad7192_attribute_group = { |
| .attrs = ad7192_attributes, |
| }; |
| |
| static struct attribute *ad7195_attributes[] = { |
| &iio_dev_attr_sampling_frequency.dev_attr.attr, |
| &iio_dev_attr_in_v_m_v_scale_available.dev_attr.attr, |
| &iio_dev_attr_in_voltage_scale_available.dev_attr.attr, |
| &iio_dev_attr_bridge_switch_en.dev_attr.attr, |
| NULL |
| }; |
| |
| static const struct attribute_group ad7195_attribute_group = { |
| .attrs = ad7195_attributes, |
| }; |
| |
| static unsigned int ad7192_get_temp_scale(bool unipolar) |
| { |
| return unipolar ? 2815 * 2 : 2815; |
| } |
| |
| static int ad7192_read_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int *val, |
| int *val2, |
| long m) |
| { |
| struct ad7192_state *st = iio_priv(indio_dev); |
| bool unipolar = !!(st->conf & AD7192_CONF_UNIPOLAR); |
| |
| switch (m) { |
| case IIO_CHAN_INFO_RAW: |
| return ad_sigma_delta_single_conversion(indio_dev, chan, val); |
| case IIO_CHAN_INFO_SCALE: |
| switch (chan->type) { |
| case IIO_VOLTAGE: |
| mutex_lock(&indio_dev->mlock); |
| *val = st->scale_avail[AD7192_CONF_GAIN(st->conf)][0]; |
| *val2 = st->scale_avail[AD7192_CONF_GAIN(st->conf)][1]; |
| mutex_unlock(&indio_dev->mlock); |
| return IIO_VAL_INT_PLUS_NANO; |
| case IIO_TEMP: |
| *val = 0; |
| *val2 = 1000000000 / ad7192_get_temp_scale(unipolar); |
| return IIO_VAL_INT_PLUS_NANO; |
| default: |
| return -EINVAL; |
| } |
| 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) |
| *val -= 273 * ad7192_get_temp_scale(unipolar); |
| return IIO_VAL_INT; |
| } |
| |
| return -EINVAL; |
| } |
| |
| static int ad7192_write_raw(struct iio_dev *indio_dev, |
| struct iio_chan_spec const *chan, |
| int val, |
| int val2, |
| long mask) |
| { |
| struct ad7192_state *st = iio_priv(indio_dev); |
| int ret, i; |
| unsigned int tmp; |
| |
| mutex_lock(&indio_dev->mlock); |
| if (iio_buffer_enabled(indio_dev)) { |
| mutex_unlock(&indio_dev->mlock); |
| return -EBUSY; |
| } |
| |
| 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 &= ~AD7192_CONF_GAIN(-1); |
| st->conf |= AD7192_CONF_GAIN(i); |
| if (tmp == st->conf) |
| break; |
| ad_sd_write_reg(&st->sd, AD7192_REG_CONF, |
| 3, st->conf); |
| ad7192_calibrate_all(st); |
| break; |
| } |
| break; |
| default: |
| ret = -EINVAL; |
| } |
| |
| mutex_unlock(&indio_dev->mlock); |
| |
| return ret; |
| } |
| |
| static int ad7192_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 ad7192_info = { |
| .read_raw = &ad7192_read_raw, |
| .write_raw = &ad7192_write_raw, |
| .write_raw_get_fmt = &ad7192_write_raw_get_fmt, |
| .attrs = &ad7192_attribute_group, |
| .validate_trigger = ad_sd_validate_trigger, |
| .driver_module = THIS_MODULE, |
| }; |
| |
| static const struct iio_info ad7195_info = { |
| .read_raw = &ad7192_read_raw, |
| .write_raw = &ad7192_write_raw, |
| .write_raw_get_fmt = &ad7192_write_raw_get_fmt, |
| .attrs = &ad7195_attribute_group, |
| .validate_trigger = ad_sd_validate_trigger, |
| .driver_module = THIS_MODULE, |
| }; |
| |
| static const struct iio_chan_spec ad7192_channels[] = { |
| AD_SD_DIFF_CHANNEL(0, 1, 2, AD7192_CH_AIN1P_AIN2M, 24, 32, 0), |
| AD_SD_DIFF_CHANNEL(1, 3, 4, AD7192_CH_AIN3P_AIN4M, 24, 32, 0), |
| AD_SD_TEMP_CHANNEL(2, AD7192_CH_TEMP, 24, 32, 0), |
| AD_SD_SHORTED_CHANNEL(3, 2, AD7192_CH_AIN2P_AIN2M, 24, 32, 0), |
| AD_SD_CHANNEL(4, 1, AD7192_CH_AIN1, 24, 32, 0), |
| AD_SD_CHANNEL(5, 2, AD7192_CH_AIN2, 24, 32, 0), |
| AD_SD_CHANNEL(6, 3, AD7192_CH_AIN3, 24, 32, 0), |
| AD_SD_CHANNEL(7, 4, AD7192_CH_AIN4, 24, 32, 0), |
| IIO_CHAN_SOFT_TIMESTAMP(8), |
| }; |
| |
| static int ad7192_probe(struct spi_device *spi) |
| { |
| const struct ad7192_platform_data *pdata = spi->dev.platform_data; |
| struct ad7192_state *st; |
| struct iio_dev *indio_dev; |
| int ret, voltage_uv = 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); |
| |
| st->reg = devm_regulator_get(&spi->dev, "vcc"); |
| if (!IS_ERR(st->reg)) { |
| ret = regulator_enable(st->reg); |
| if (ret) |
| return ret; |
| |
| voltage_uv = regulator_get_voltage(st->reg); |
| } |
| |
| if (pdata && pdata->vref_mv) |
| st->int_vref_mv = pdata->vref_mv; |
| else if (voltage_uv) |
| st->int_vref_mv = voltage_uv / 1000; |
| else |
| dev_warn(&spi->dev, "reference voltage undefined\n"); |
| |
| spi_set_drvdata(spi, indio_dev); |
| st->devid = spi_get_device_id(spi)->driver_data; |
| indio_dev->dev.parent = &spi->dev; |
| indio_dev->name = spi_get_device_id(spi)->name; |
| indio_dev->modes = INDIO_DIRECT_MODE; |
| indio_dev->channels = ad7192_channels; |
| indio_dev->num_channels = ARRAY_SIZE(ad7192_channels); |
| if (st->devid == ID_AD7195) |
| indio_dev->info = &ad7195_info; |
| else |
| indio_dev->info = &ad7192_info; |
| |
| ad_sd_init(&st->sd, indio_dev, spi, &ad7192_sigma_delta_info); |
| |
| ret = ad_sd_setup_buffer_and_trigger(indio_dev); |
| if (ret) |
| goto error_disable_reg; |
| |
| ret = ad7192_setup(st, pdata); |
| if (ret) |
| goto error_remove_trigger; |
| |
| ret = iio_device_register(indio_dev); |
| if (ret < 0) |
| goto error_remove_trigger; |
| return 0; |
| |
| error_remove_trigger: |
| ad_sd_cleanup_buffer_and_trigger(indio_dev); |
| error_disable_reg: |
| if (!IS_ERR(st->reg)) |
| regulator_disable(st->reg); |
| |
| return ret; |
| } |
| |
| static int ad7192_remove(struct spi_device *spi) |
| { |
| struct iio_dev *indio_dev = spi_get_drvdata(spi); |
| struct ad7192_state *st = iio_priv(indio_dev); |
| |
| iio_device_unregister(indio_dev); |
| ad_sd_cleanup_buffer_and_trigger(indio_dev); |
| |
| if (!IS_ERR(st->reg)) |
| regulator_disable(st->reg); |
| |
| return 0; |
| } |
| |
| static const struct spi_device_id ad7192_id[] = { |
| {"ad7190", ID_AD7190}, |
| {"ad7192", ID_AD7192}, |
| {"ad7195", ID_AD7195}, |
| {} |
| }; |
| MODULE_DEVICE_TABLE(spi, ad7192_id); |
| |
| static struct spi_driver ad7192_driver = { |
| .driver = { |
| .name = "ad7192", |
| .owner = THIS_MODULE, |
| }, |
| .probe = ad7192_probe, |
| .remove = ad7192_remove, |
| .id_table = ad7192_id, |
| }; |
| module_spi_driver(ad7192_driver); |
| |
| MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); |
| MODULE_DESCRIPTION("Analog Devices AD7190, AD7192, AD7195 ADC"); |
| MODULE_LICENSE("GPL v2"); |