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linux/drivers/iio/adc/ad7793.c
Greg Kroah-Hartman f3cf3fb7ec First set of new device support, features and cleanups for IIO in the 4.5 cycle 
Usual mixed bag, but the big item perhaps in this series is the DMA buffer
 support added by Lars-Peter Clausen. It's been in the works for a long time
 and it will be interesting to see what hardware support shows up now that
 this is available.
 
 New core features + associate cleanup.
 * Add generic DMA buffer infrastructure
 * Add a DMAengine framework based buffer
  Also associated minor changes.
    - Set the device buffer watermark based on the minimum watermark for all
      attached buffers rather than just the 'primary' one.
    - iio_buffer_init - only set the watermark default if one hasn't already
      been provided.  This allows simple support for devices with a fixed
      watermark.
    - read only attribute for watermark on fixed watermark devices.
    - add explicit buffer enable/disable callbacks to allow the buffer to
      do more than trivial actions when it is being turned on and off.
 * IIO_VAL_INT support in write_raw_get_fmt function.
 
 New device support
 * Freescale MMA7455/7456L accelerometers
 * Memsic MXC6255XC accelerometer
 * ST lis2dh12 accelerometer
 * TI ADS8688 ADC
 * TI Palamas (twl6035/7) gpadc
 
 New driver features
 * mma8452
   - support either of the available interrupt pins to cope with the case
     where board layout has lead to a particular one being connected.
 
 Staging graduation
 * Dummy driver
   - this driver acts as both an example and a test device for those with
     out hardware to develop userspace code against.
 
 Cleanups and minor bits and bobs.
 * treewide
   - Sort out the ordering of iio_device_register/unregister vs runtime
     pm function calls so that it's all nice and consistent and not race
     prone.
   - Check sscanf return values.  None of the cases will actually happen as
     the strings are supplied internally, but best to be consistent on this.
 * ad7780
   - switch over to the gpio descriptor interface and remove the now unused
     platform data which gets rid of a header entirely.
 * ad7793
   - drop a pointless else statement.
 * at91_adc
   - Swap kmalloc_array in for a kmalloc doing the same job.
 * dummy
   - get rid of some commented out lines that snuck in during the move of
     the driver.
 * lm3533-als
   - Print an error message on provision of an invalid resistance.
 * mcp320x
   - Add compatible strings with vendor prefix and deprecate those with
     no vendor prefix.
 * mxs-lradc
   - Use BIT macro in various places rather than shifted ones.
 * pa12203001
   - Power off the chip if the registration fails.
 * pulsedlight-lidar-lite
   - add runtime PM support.
 * xilinx XADC
   - constify an iio_buffer_setup_ops structure.
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Merge tag 'iio-for-4.5a' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-next

Jonathan writes:

First set of new device support, features and cleanups for IIO in the 4.5 cycle

Usual mixed bag, but the big item perhaps in this series is the DMA buffer
support added by Lars-Peter Clausen. It's been in the works for a long time
and it will be interesting to see what hardware support shows up now that
this is available.

New core features + associate cleanup.
* Add generic DMA buffer infrastructure
* Add a DMAengine framework based buffer
 Also associated minor changes.
   - Set the device buffer watermark based on the minimum watermark for all
     attached buffers rather than just the 'primary' one.
   - iio_buffer_init - only set the watermark default if one hasn't already
     been provided.  This allows simple support for devices with a fixed
     watermark.
   - read only attribute for watermark on fixed watermark devices.
   - add explicit buffer enable/disable callbacks to allow the buffer to
     do more than trivial actions when it is being turned on and off.
* IIO_VAL_INT support in write_raw_get_fmt function.

New device support
* Freescale MMA7455/7456L accelerometers
* Memsic MXC6255XC accelerometer
* ST lis2dh12 accelerometer
* TI ADS8688 ADC
* TI Palamas (twl6035/7) gpadc

New driver features
* mma8452
  - support either of the available interrupt pins to cope with the case
    where board layout has lead to a particular one being connected.

Staging graduation
* Dummy driver
  - this driver acts as both an example and a test device for those with
    out hardware to develop userspace code against.

Cleanups and minor bits and bobs.
* treewide
  - Sort out the ordering of iio_device_register/unregister vs runtime
    pm function calls so that it's all nice and consistent and not race
    prone.
  - Check sscanf return values.  None of the cases will actually happen as
    the strings are supplied internally, but best to be consistent on this.
* ad7780
  - switch over to the gpio descriptor interface and remove the now unused
    platform data which gets rid of a header entirely.
* ad7793
  - drop a pointless else statement.
* at91_adc
  - Swap kmalloc_array in for a kmalloc doing the same job.
* dummy
  - get rid of some commented out lines that snuck in during the move of
    the driver.
* lm3533-als
  - Print an error message on provision of an invalid resistance.
* mcp320x
  - Add compatible strings with vendor prefix and deprecate those with
    no vendor prefix.
* mxs-lradc
  - Use BIT macro in various places rather than shifted ones.
* pa12203001
  - Power off the chip if the registration fails.
* pulsedlight-lidar-lite
  - add runtime PM support.
* xilinx XADC
  - constify an iio_buffer_setup_ops structure.
2015-12-01 09:13:29 -08:00

864 lines
25 KiB
C
Raw Blame History

/*
* 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 = -1;
unsigned long long scale_uv;
u32 id;
ret = ad7793_check_platform_data(st, pdata);
if (ret)
return ret;
/* reset the serial interface */
ret = spi_write(st->sd.spi, (u8 *)&ret, sizeof(ret));
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) {
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 ssize_t ad7793_read_frequency(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);
return sprintf(buf, "%d\n",
st->chip_info->sample_freq_avail[AD7793_MODE_RATE(st->mode)]);
}
static ssize_t ad7793_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 ad7793_state *st = iio_priv(indio_dev);
long lval;
int i, ret;
mutex_lock(&indio_dev->mlock);
if (iio_buffer_enabled(indio_dev)) {
mutex_unlock(&indio_dev->mlock);
return -EBUSY;
}
mutex_unlock(&indio_dev->mlock);
ret = kstrtol(buf, 10, &lval);
if (ret)
return ret;
if (lval == 0)
return -EINVAL;
ret = -EINVAL;
for (i = 0; i < 16; i++)
if (lval == st->chip_info->sample_freq_avail[i]) {
mutex_lock(&indio_dev->mlock);
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);
mutex_unlock(&indio_dev->mlock);
ret = 0;
}
return ret ? ret : len;
}
static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
ad7793_read_frequency,
ad7793_write_frequency);
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_dev_attr_sampling_frequency.dev_attr.attr,
&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_dev_attr_sampling_frequency.dev_attr.attr,
&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;
}
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;
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 &= ~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;
default:
ret = -EINVAL;
}
mutex_unlock(&indio_dev->mlock);
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,
.driver_module = THIS_MODULE,
};
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 = &ad7793_attribute_group,
.validate_trigger = ad_sd_validate_trigger,
.driver_module = THIS_MODULE,
};
#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->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");
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