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android-kvm / linux / 5bb6ba448fe3598a7668838942db1f008beb581b / . / drivers / iio / adc / ad9467.c
blob: 05fb7a75531fb7a71e05022044290c2b79252887 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/*
* Analog Devices AD9467 SPI ADC driver
*
* Copyright 2012-2020 Analog Devices Inc.
*/
#include <linux/bitmap.h>
#include <linux/bitops.h>
#include <linux/cleanup.h>
#include <linux/debugfs.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/seq_file.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/of.h>
#include <linux/iio/backend.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/clk.h>
/*
* ADI High-Speed ADC common spi interface registers
* See Application-Note AN-877:
* https://www.analog.com/media/en/technical-documentation/application-notes/AN-877.pdf
*/
#define AN877_ADC_REG_CHIP_PORT_CONF 0x00
#define AN877_ADC_REG_CHIP_ID 0x01
#define AN877_ADC_REG_CHIP_GRADE 0x02
#define AN877_ADC_REG_CHAN_INDEX 0x05
#define AN877_ADC_REG_TRANSFER 0xFF
#define AN877_ADC_REG_MODES 0x08
#define AN877_ADC_REG_TEST_IO 0x0D
#define AN877_ADC_REG_ADC_INPUT 0x0F
#define AN877_ADC_REG_OFFSET 0x10
#define AN877_ADC_REG_OUTPUT_MODE 0x14
#define AN877_ADC_REG_OUTPUT_ADJUST 0x15
#define AN877_ADC_REG_OUTPUT_PHASE 0x16
#define AN877_ADC_REG_OUTPUT_DELAY 0x17
#define AN877_ADC_REG_VREF 0x18
#define AN877_ADC_REG_ANALOG_INPUT 0x2C
/* AN877_ADC_REG_TEST_IO */
#define AN877_ADC_TESTMODE_OFF 0x0
#define AN877_ADC_TESTMODE_MIDSCALE_SHORT 0x1
#define AN877_ADC_TESTMODE_POS_FULLSCALE 0x2
#define AN877_ADC_TESTMODE_NEG_FULLSCALE 0x3
#define AN877_ADC_TESTMODE_ALT_CHECKERBOARD 0x4
#define AN877_ADC_TESTMODE_PN23_SEQ 0x5
#define AN877_ADC_TESTMODE_PN9_SEQ 0x6
#define AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE 0x7
#define AN877_ADC_TESTMODE_USER 0x8
#define AN877_ADC_TESTMODE_BIT_TOGGLE 0x9
#define AN877_ADC_TESTMODE_SYNC 0xA
#define AN877_ADC_TESTMODE_ONE_BIT_HIGH 0xB
#define AN877_ADC_TESTMODE_MIXED_BIT_FREQUENCY 0xC
#define AN877_ADC_TESTMODE_RAMP 0xF
/* AN877_ADC_REG_TRANSFER */
#define AN877_ADC_TRANSFER_SYNC 0x1
/* AN877_ADC_REG_OUTPUT_MODE */
#define AN877_ADC_OUTPUT_MODE_OFFSET_BINARY 0x0
#define AN877_ADC_OUTPUT_MODE_TWOS_COMPLEMENT 0x1
#define AN877_ADC_OUTPUT_MODE_GRAY_CODE 0x2
/* AN877_ADC_REG_OUTPUT_PHASE */
#define AN877_ADC_OUTPUT_EVEN_ODD_MODE_EN 0x20
#define AN877_ADC_INVERT_DCO_CLK 0x80
/* AN877_ADC_REG_OUTPUT_DELAY */
#define AN877_ADC_DCO_DELAY_ENABLE 0x80
/*
* Analog Devices AD9265 16-Bit, 125/105/80 MSPS ADC
*/
#define CHIPID_AD9265 0x64
#define AD9265_DEF_OUTPUT_MODE 0x40
#define AD9265_REG_VREF_MASK 0xC0
/*
* Analog Devices AD9434 12-Bit, 370/500 MSPS ADC
*/
#define CHIPID_AD9434 0x6A
#define AD9434_DEF_OUTPUT_MODE 0x00
#define AD9434_REG_VREF_MASK 0xC0
/*
* Analog Devices AD9467 16-Bit, 200/250 MSPS ADC
*/
#define CHIPID_AD9467 0x50
#define AD9467_DEF_OUTPUT_MODE 0x08
#define AD9467_REG_VREF_MASK 0x0F
/*
* Analog Devices AD9643 14-Bit, 170/210/250 MSPS ADC
*/
#define CHIPID_AD9643 0x82
#define AD9643_REG_VREF_MASK 0x1F
/*
* Analog Devices AD9652 16-bit 310 MSPS ADC
*/
#define CHIPID_AD9652 0xC1
#define AD9652_REG_VREF_MASK 0xC0
/*
* Analog Devices AD9649 14-bit 20/40/65/80 MSPS ADC
*/
#define CHIPID_AD9649 0x6F
#define AD9649_TEST_POINTS 8
#define AD9647_MAX_TEST_POINTS 32
#define AD9467_CAN_INVERT(st) \
(!(st)->info->has_dco || (st)->info->has_dco_invert)
struct ad9467_chip_info {
const char *name;
unsigned int id;
const struct iio_chan_spec *channels;
unsigned int num_channels;
const unsigned int (*scale_table)[2];
int num_scales;
unsigned long test_mask;
unsigned int test_mask_len;
unsigned long max_rate;
unsigned int default_output_mode;
unsigned int vref_mask;
unsigned int num_lanes;
unsigned int dco_en;
unsigned int test_points;
/* data clock output */
bool has_dco;
bool has_dco_invert;
};
struct ad9467_chan_test_mode {
struct ad9467_state *st;
unsigned int idx;
u8 mode;
};
struct ad9467_state {
const struct ad9467_chip_info *info;
struct iio_backend *back;
struct spi_device *spi;
struct clk *clk;
/* used for debugfs */
struct ad9467_chan_test_mode *chan_test;
unsigned int output_mode;
unsigned int (*scales)[2];
/*
* Times 2 because we may also invert the signal polarity and run the
* calibration again. For some reference on the test points (ad9265) see:
* https://www.analog.com/media/en/technical-documentation/data-sheets/ad9265.pdf
* at page 38 for the dco output delay. On devices as ad9467, the
* calibration is done at the backend level. For the ADI axi-adc:
* https://wiki.analog.com/resources/fpga/docs/axi_adc_ip
* at the io delay control section.
*/
DECLARE_BITMAP(calib_map, AD9647_MAX_TEST_POINTS * 2);
/* number of bits of the map */
unsigned int calib_map_size;
struct gpio_desc *pwrdown_gpio;
/* ensure consistent state obtained on multiple related accesses */
struct mutex lock;
u8 buf[3] __aligned(IIO_DMA_MINALIGN);
};
static int ad9467_spi_read(struct ad9467_state *st, unsigned int reg)
{
unsigned char tbuf[2], rbuf[1];
int ret;
tbuf[0] = 0x80 | (reg >> 8);
tbuf[1] = reg & 0xFF;
ret = spi_write_then_read(st->spi,
tbuf, ARRAY_SIZE(tbuf),
rbuf, ARRAY_SIZE(rbuf));
if (ret < 0)
return ret;
return rbuf[0];
}
static int ad9467_spi_write(struct ad9467_state *st, unsigned int reg,
unsigned int val)
{
st->buf[0] = reg >> 8;
st->buf[1] = reg & 0xFF;
st->buf[2] = val;
return spi_write(st->spi, st->buf, ARRAY_SIZE(st->buf));
}
static int ad9467_reg_access(struct iio_dev *indio_dev, unsigned int reg,
unsigned int writeval, unsigned int *readval)
{
struct ad9467_state *st = iio_priv(indio_dev);
int ret;
if (!readval) {
guard(mutex)(&st->lock);
ret = ad9467_spi_write(st, reg, writeval);
if (ret)
return ret;
return ad9467_spi_write(st, AN877_ADC_REG_TRANSFER,
AN877_ADC_TRANSFER_SYNC);
}
ret = ad9467_spi_read(st, reg);
if (ret < 0)
return ret;
*readval = ret;
return 0;
}
static const unsigned int ad9265_scale_table[][2] = {
{1250, 0x00}, {1500, 0x40}, {1750, 0x80}, {2000, 0xC0},
};
static const unsigned int ad9434_scale_table[][2] = {
{1600, 0x1C}, {1580, 0x1D}, {1550, 0x1E}, {1520, 0x1F}, {1500, 0x00},
{1470, 0x01}, {1440, 0x02}, {1420, 0x03}, {1390, 0x04}, {1360, 0x05},
{1340, 0x06}, {1310, 0x07}, {1280, 0x08}, {1260, 0x09}, {1230, 0x0A},
{1200, 0x0B}, {1180, 0x0C},
};
static const unsigned int ad9467_scale_table[][2] = {
{2000, 0}, {2100, 6}, {2200, 7},
{2300, 8}, {2400, 9}, {2500, 10},
};
static const unsigned int ad9643_scale_table[][2] = {
{2087, 0x0F}, {2065, 0x0E}, {2042, 0x0D}, {2020, 0x0C}, {1997, 0x0B},
{1975, 0x0A}, {1952, 0x09}, {1930, 0x08}, {1907, 0x07}, {1885, 0x06},
{1862, 0x05}, {1840, 0x04}, {1817, 0x03}, {1795, 0x02}, {1772, 0x01},
{1750, 0x00}, {1727, 0x1F}, {1704, 0x1E}, {1681, 0x1D}, {1658, 0x1C},
{1635, 0x1B}, {1612, 0x1A}, {1589, 0x19}, {1567, 0x18}, {1544, 0x17},
{1521, 0x16}, {1498, 0x15}, {1475, 0x14}, {1452, 0x13}, {1429, 0x12},
{1406, 0x11}, {1383, 0x10},
};
static const unsigned int ad9649_scale_table[][2] = {
{2000, 0},
};
static const unsigned int ad9652_scale_table[][2] = {
{1250, 0}, {1125, 1}, {1200, 2}, {1250, 3}, {1000, 5},
};
static void __ad9467_get_scale(struct ad9467_state *st, int index,
unsigned int *val, unsigned int *val2)
{
const struct ad9467_chip_info *info = st->info;
const struct iio_chan_spec *chan = &info->channels[0];
unsigned int tmp;
tmp = (info->scale_table[index][0] * 1000000ULL) >>
chan->scan_type.realbits;
*val = tmp / 1000000;
*val2 = tmp % 1000000;
}
#define AD9467_CHAN(_chan, avai_mask, _si, _bits, _sign) \
{ \
.type = IIO_VOLTAGE, \
.indexed = 1, \
.channel = _chan, \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.info_mask_shared_by_type_available = avai_mask, \
.scan_index = _si, \
.scan_type = { \
.sign = _sign, \
.realbits = _bits, \
.storagebits = 16, \
}, \
}
static const struct iio_chan_spec ad9434_channels[] = {
AD9467_CHAN(0, BIT(IIO_CHAN_INFO_SCALE), 0, 12, 's'),
};
static const struct iio_chan_spec ad9467_channels[] = {
AD9467_CHAN(0, BIT(IIO_CHAN_INFO_SCALE), 0, 16, 's'),
};
static const struct iio_chan_spec ad9643_channels[] = {
AD9467_CHAN(0, BIT(IIO_CHAN_INFO_SCALE), 0, 14, 's'),
AD9467_CHAN(1, BIT(IIO_CHAN_INFO_SCALE), 1, 14, 's'),
};
static const struct iio_chan_spec ad9649_channels[] = {
AD9467_CHAN(0, 0, 0, 14, 's'),
};
static const struct iio_chan_spec ad9652_channels[] = {
AD9467_CHAN(0, BIT(IIO_CHAN_INFO_SCALE), 0, 16, 's'),
AD9467_CHAN(1, BIT(IIO_CHAN_INFO_SCALE), 1, 16, 's'),
};
static const char * const ad9467_test_modes[] = {
[AN877_ADC_TESTMODE_OFF] = "off",
[AN877_ADC_TESTMODE_MIDSCALE_SHORT] = "midscale_short",
[AN877_ADC_TESTMODE_POS_FULLSCALE] = "pos_fullscale",
[AN877_ADC_TESTMODE_NEG_FULLSCALE] = "neg_fullscale",
[AN877_ADC_TESTMODE_ALT_CHECKERBOARD] = "checkerboard",
[AN877_ADC_TESTMODE_PN23_SEQ] = "prbs23",
[AN877_ADC_TESTMODE_PN9_SEQ] = "prbs9",
[AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE] = "one_zero_toggle",
[AN877_ADC_TESTMODE_USER] = "user",
[AN877_ADC_TESTMODE_BIT_TOGGLE] = "bit_toggle",
[AN877_ADC_TESTMODE_SYNC] = "sync",
[AN877_ADC_TESTMODE_ONE_BIT_HIGH] = "one_bit_high",
[AN877_ADC_TESTMODE_MIXED_BIT_FREQUENCY] = "mixed_bit_frequency",
[AN877_ADC_TESTMODE_RAMP] = "ramp",
};
static const struct ad9467_chip_info ad9467_chip_tbl = {
.name = "ad9467",
.id = CHIPID_AD9467,
.max_rate = 250000000UL,
.scale_table = ad9467_scale_table,
.num_scales = ARRAY_SIZE(ad9467_scale_table),
.channels = ad9467_channels,
.num_channels = ARRAY_SIZE(ad9467_channels),
.test_points = AD9647_MAX_TEST_POINTS,
.test_mask = GENMASK(AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE,
AN877_ADC_TESTMODE_OFF),
.test_mask_len = AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE + 1,
.default_output_mode = AD9467_DEF_OUTPUT_MODE,
.vref_mask = AD9467_REG_VREF_MASK,
.num_lanes = 8,
};
static const struct ad9467_chip_info ad9434_chip_tbl = {
.name = "ad9434",
.id = CHIPID_AD9434,
.max_rate = 500000000UL,
.scale_table = ad9434_scale_table,
.num_scales = ARRAY_SIZE(ad9434_scale_table),
.channels = ad9434_channels,
.num_channels = ARRAY_SIZE(ad9434_channels),
.test_points = AD9647_MAX_TEST_POINTS,
.test_mask = GENMASK(AN877_ADC_TESTMODE_USER, AN877_ADC_TESTMODE_OFF),
.test_mask_len = AN877_ADC_TESTMODE_USER + 1,
.default_output_mode = AD9434_DEF_OUTPUT_MODE,
.vref_mask = AD9434_REG_VREF_MASK,
.num_lanes = 6,
};
static const struct ad9467_chip_info ad9265_chip_tbl = {
.name = "ad9265",
.id = CHIPID_AD9265,
.max_rate = 125000000UL,
.scale_table = ad9265_scale_table,
.num_scales = ARRAY_SIZE(ad9265_scale_table),
.channels = ad9467_channels,
.num_channels = ARRAY_SIZE(ad9467_channels),
.test_points = AD9647_MAX_TEST_POINTS,
.test_mask = GENMASK(AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE,
AN877_ADC_TESTMODE_OFF),
.test_mask_len = AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE + 1,
.default_output_mode = AD9265_DEF_OUTPUT_MODE,
.vref_mask = AD9265_REG_VREF_MASK,
.has_dco = true,
.has_dco_invert = true,
};
static const struct ad9467_chip_info ad9643_chip_tbl = {
.name = "ad9643",
.id = CHIPID_AD9643,
.max_rate = 250000000UL,
.scale_table = ad9643_scale_table,
.num_scales = ARRAY_SIZE(ad9643_scale_table),
.channels = ad9643_channels,
.num_channels = ARRAY_SIZE(ad9643_channels),
.test_points = AD9647_MAX_TEST_POINTS,
.test_mask = BIT(AN877_ADC_TESTMODE_RAMP) |
GENMASK(AN877_ADC_TESTMODE_MIXED_BIT_FREQUENCY, AN877_ADC_TESTMODE_OFF),
.test_mask_len = AN877_ADC_TESTMODE_RAMP + 1,
.vref_mask = AD9643_REG_VREF_MASK,
.has_dco = true,
.has_dco_invert = true,
.dco_en = AN877_ADC_DCO_DELAY_ENABLE,
};
static const struct ad9467_chip_info ad9649_chip_tbl = {
.name = "ad9649",
.id = CHIPID_AD9649,
.max_rate = 80000000UL,
.scale_table = ad9649_scale_table,
.num_scales = ARRAY_SIZE(ad9649_scale_table),
.channels = ad9649_channels,
.num_channels = ARRAY_SIZE(ad9649_channels),
.test_points = AD9649_TEST_POINTS,
.test_mask = GENMASK(AN877_ADC_TESTMODE_MIXED_BIT_FREQUENCY,
AN877_ADC_TESTMODE_OFF),
.test_mask_len = AN877_ADC_TESTMODE_MIXED_BIT_FREQUENCY + 1,
.has_dco = true,
.has_dco_invert = true,
.dco_en = AN877_ADC_DCO_DELAY_ENABLE,
};
static const struct ad9467_chip_info ad9652_chip_tbl = {
.name = "ad9652",
.id = CHIPID_AD9652,
.max_rate = 310000000UL,
.scale_table = ad9652_scale_table,
.num_scales = ARRAY_SIZE(ad9652_scale_table),
.channels = ad9652_channels,
.num_channels = ARRAY_SIZE(ad9652_channels),
.test_points = AD9647_MAX_TEST_POINTS,
.test_mask = GENMASK(AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE,
AN877_ADC_TESTMODE_OFF),
.test_mask_len = AN877_ADC_TESTMODE_ONE_ZERO_TOGGLE + 1,
.vref_mask = AD9652_REG_VREF_MASK,
.has_dco = true,
};
static int ad9467_get_scale(struct ad9467_state *st, int *val, int *val2)
{
const struct ad9467_chip_info *info = st->info;
unsigned int vref_val;
unsigned int i = 0;
int ret;
/* nothing to read if we only have one possible scale */
if (info->num_scales == 1)
goto out_get_scale;
ret = ad9467_spi_read(st, AN877_ADC_REG_VREF);
if (ret < 0)
return ret;
vref_val = ret & info->vref_mask;
for (i = 0; i < info->num_scales; i++) {
if (vref_val == info->scale_table[i][1])
break;
}
if (i == info->num_scales)
return -ERANGE;
out_get_scale:
__ad9467_get_scale(st, i, val, val2);
return IIO_VAL_INT_PLUS_MICRO;
}
static int ad9467_set_scale(struct ad9467_state *st, int val, int val2)
{
const struct ad9467_chip_info *info = st->info;
unsigned int scale_val[2];
unsigned int i;
int ret;
if (val != 0)
return -EINVAL;
if (info->num_scales == 1)
return -EOPNOTSUPP;
for (i = 0; i < info->num_scales; i++) {
__ad9467_get_scale(st, i, &scale_val[0], &scale_val[1]);
if (scale_val[0] != val || scale_val[1] != val2)
continue;
guard(mutex)(&st->lock);
ret = ad9467_spi_write(st, AN877_ADC_REG_VREF,
info->scale_table[i][1]);
if (ret < 0)
return ret;
return ad9467_spi_write(st, AN877_ADC_REG_TRANSFER,
AN877_ADC_TRANSFER_SYNC);
}
return -EINVAL;
}
static int ad9467_outputmode_set(struct ad9467_state *st, unsigned int mode)
{
int ret;
ret = ad9467_spi_write(st, AN877_ADC_REG_OUTPUT_MODE, mode);
if (ret < 0)
return ret;
return ad9467_spi_write(st, AN877_ADC_REG_TRANSFER,
AN877_ADC_TRANSFER_SYNC);
}
static int ad9467_testmode_set(struct ad9467_state *st, unsigned int chan,
unsigned int test_mode)
{
int ret;
if (st->info->num_channels > 1) {
/* so that the test mode is only applied to one channel */
ret = ad9467_spi_write(st, AN877_ADC_REG_CHAN_INDEX, BIT(chan));
if (ret)
return ret;
}
ret = ad9467_spi_write(st, AN877_ADC_REG_TEST_IO, test_mode);
if (ret)
return ret;
if (st->info->num_channels > 1) {
/* go to default state where all channels get write commands */
ret = ad9467_spi_write(st, AN877_ADC_REG_CHAN_INDEX,
GENMASK(st->info->num_channels - 1, 0));
if (ret)
return ret;
}
return ad9467_spi_write(st, AN877_ADC_REG_TRANSFER,
AN877_ADC_TRANSFER_SYNC);
}
static int ad9467_backend_testmode_on(struct ad9467_state *st,
unsigned int chan,
enum iio_backend_test_pattern pattern)
{
struct iio_backend_data_fmt data = {
.enable = false,
};
int ret;
ret = iio_backend_data_format_set(st->back, chan, &data);
if (ret)
return ret;
ret = iio_backend_test_pattern_set(st->back, chan, pattern);
if (ret)
return ret;
return iio_backend_chan_enable(st->back, chan);
}
static int ad9467_backend_testmode_off(struct ad9467_state *st,
unsigned int chan)
{
struct iio_backend_data_fmt data = {
.enable = true,
.sign_extend = true,
};
int ret;
ret = iio_backend_chan_disable(st->back, chan);
if (ret)
return ret;
ret = iio_backend_test_pattern_set(st->back, chan,
IIO_BACKEND_NO_TEST_PATTERN);
if (ret)
return ret;
return iio_backend_data_format_set(st->back, chan, &data);
}
static int ad9647_calibrate_prepare(struct ad9467_state *st)
{
unsigned int c;
int ret;
ret = ad9467_outputmode_set(st, st->info->default_output_mode);
if (ret)
return ret;
for (c = 0; c < st->info->num_channels; c++) {
ret = ad9467_testmode_set(st, c, AN877_ADC_TESTMODE_PN9_SEQ);
if (ret)
return ret;
ret = ad9467_backend_testmode_on(st, c,
IIO_BACKEND_ADI_PRBS_9A);
if (ret)
return ret;
}
return 0;
}
static int ad9647_calibrate_polarity_set(struct ad9467_state *st,
bool invert)
{
enum iio_backend_sample_trigger trigger;
if (st->info->has_dco) {
unsigned int phase = AN877_ADC_OUTPUT_EVEN_ODD_MODE_EN;
if (invert)
phase |= AN877_ADC_INVERT_DCO_CLK;
return ad9467_spi_write(st, AN877_ADC_REG_OUTPUT_PHASE,
phase);
}
if (invert)
trigger = IIO_BACKEND_SAMPLE_TRIGGER_EDGE_FALLING;
else
trigger = IIO_BACKEND_SAMPLE_TRIGGER_EDGE_RISING;
return iio_backend_data_sample_trigger(st->back, trigger);
}
/*
* The idea is pretty simple. Find the max number of successful points in a row
* and get the one in the middle.
*/
static unsigned int ad9467_find_optimal_point(const unsigned long *calib_map,
unsigned int start,
unsigned int nbits,
unsigned int *val)
{
unsigned int bit = start, end, start_cnt, cnt = 0;
for_each_clear_bitrange_from(bit, end, calib_map, nbits + start) {
if (end - bit > cnt) {
cnt = end - bit;
start_cnt = bit;
}
}
if (cnt)
*val = start_cnt + cnt / 2;
return cnt;
}
static int ad9467_calibrate_apply(struct ad9467_state *st, unsigned int val)
{
unsigned int lane;
int ret;
if (st->info->has_dco) {
ret = ad9467_spi_write(st, AN877_ADC_REG_OUTPUT_DELAY,
val | st->info->dco_en);
if (ret)
return ret;
return ad9467_spi_write(st, AN877_ADC_REG_TRANSFER,
AN877_ADC_TRANSFER_SYNC);
}
for (lane = 0; lane < st->info->num_lanes; lane++) {
ret = iio_backend_iodelay_set(st->back, lane, val);
if (ret)
return ret;
}
return 0;
}
static int ad9647_calibrate_stop(struct ad9467_state *st)
{
unsigned int c, mode;
int ret;
for (c = 0; c < st->info->num_channels; c++) {
ret = ad9467_backend_testmode_off(st, c);
if (ret)
return ret;
ret = ad9467_testmode_set(st, c, AN877_ADC_TESTMODE_OFF);
if (ret)
return ret;
}
mode = st->info->default_output_mode | AN877_ADC_OUTPUT_MODE_TWOS_COMPLEMENT;
return ad9467_outputmode_set(st, mode);
}
static int ad9467_calibrate(struct ad9467_state *st)
{
unsigned int point, val, inv_val, cnt, inv_cnt = 0, c;
/*
* Half of the bitmap is for the inverted signal. The number of test
* points is the same though...
*/
unsigned int test_points = st->info->test_points;
unsigned long sample_rate = clk_get_rate(st->clk);
struct device *dev = &st->spi->dev;
bool invert = false, stat;
int ret;
/* all points invalid */
bitmap_fill(st->calib_map, st->calib_map_size);
ret = ad9647_calibrate_prepare(st);
if (ret)
return ret;
retune:
ret = ad9647_calibrate_polarity_set(st, invert);
if (ret)
return ret;
for (point = 0; point < st->info->test_points; point++) {
ret = ad9467_calibrate_apply(st, point);
if (ret)
return ret;
for (c = 0; c < st->info->num_channels; c++) {
ret = iio_backend_chan_status(st->back, c, &stat);
if (ret)
return ret;
/*
* A point is considered valid if all channels report no
* error. If one reports an error, then we consider the
* point as invalid and we can break the loop right away.
*/
if (stat) {
dev_dbg(dev, "Invalid point(%u, inv:%u) for CH:%u\n",
point, invert, c);
break;
}
if (c == st->info->num_channels - 1)
__clear_bit(point + invert * test_points,
st->calib_map);
}
}
if (!invert) {
cnt = ad9467_find_optimal_point(st->calib_map, 0, test_points,
&val);
/*
* We're happy if we find, at least, three good test points in
* a row.
*/
if (cnt < 3) {
if (AD9467_CAN_INVERT(st)) {
invert = true;
goto retune;
}
if (!cnt)
return -EIO;
}
} else {
inv_cnt = ad9467_find_optimal_point(st->calib_map, test_points,
test_points, &inv_val);
if (!inv_cnt && !cnt)
return -EIO;
}
if (inv_cnt < cnt) {
ret = ad9647_calibrate_polarity_set(st, false);
if (ret)
return ret;
} else {
/*
* polarity inverted is the last test to run. Hence, there's no
* need to re-do any configuration. We just need to "normalize"
* the selected value.
*/
val = inv_val - test_points;
}
if (st->info->has_dco)
dev_dbg(dev, "%sDCO 0x%X CLK %lu Hz\n", inv_cnt >= cnt ? "INVERT " : "",
val, sample_rate);
else
dev_dbg(dev, "%sIDELAY 0x%x\n", inv_cnt >= cnt ? "INVERT " : "",
val);
ret = ad9467_calibrate_apply(st, val);
if (ret)
return ret;
/* finally apply the optimal value */
return ad9647_calibrate_stop(st);
}
static int ad9467_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long m)
{
struct ad9467_state *st = iio_priv(indio_dev);
switch (m) {
case IIO_CHAN_INFO_SCALE:
return ad9467_get_scale(st, val, val2);
case IIO_CHAN_INFO_SAMP_FREQ:
*val = clk_get_rate(st->clk);
return IIO_VAL_INT;
default:
return -EINVAL;
}
}
static int ad9467_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct ad9467_state *st = iio_priv(indio_dev);
const struct ad9467_chip_info *info = st->info;
unsigned long sample_rate;
long r_clk;
int ret;
switch (mask) {
case IIO_CHAN_INFO_SCALE:
return ad9467_set_scale(st, val, val2);
case IIO_CHAN_INFO_SAMP_FREQ:
r_clk = clk_round_rate(st->clk, val);
if (r_clk < 0 || r_clk > info->max_rate) {
dev_warn(&st->spi->dev,
"Error setting ADC sample rate %ld", r_clk);
return -EINVAL;
}
sample_rate = clk_get_rate(st->clk);
/*
* clk_set_rate() would also do this but since we would still
* need it for avoiding an unnecessary calibration, do it now.
*/
if (sample_rate == r_clk)
return 0;
iio_device_claim_direct_scoped(return -EBUSY, indio_dev) {
ret = clk_set_rate(st->clk, r_clk);
if (ret)
return ret;
guard(mutex)(&st->lock);
ret = ad9467_calibrate(st);
}
return ret;
default:
return -EINVAL;
}
}
static int ad9467_read_avail(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
const int **vals, int *type, int *length,
long mask)
{
struct ad9467_state *st = iio_priv(indio_dev);
const struct ad9467_chip_info *info = st->info;
switch (mask) {
case IIO_CHAN_INFO_SCALE:
*vals = (const int *)st->scales;
*type = IIO_VAL_INT_PLUS_MICRO;
/* Values are stored in a 2D matrix */
*length = info->num_scales * 2;
return IIO_AVAIL_LIST;
default:
return -EINVAL;
}
}
static int ad9467_update_scan_mode(struct iio_dev *indio_dev,
const unsigned long *scan_mask)
{
struct ad9467_state *st = iio_priv(indio_dev);
unsigned int c;
int ret;
for (c = 0; c < st->info->num_channels; c++) {
if (test_bit(c, scan_mask))
ret = iio_backend_chan_enable(st->back, c);
else
ret = iio_backend_chan_disable(st->back, c);
if (ret)
return ret;
}
return 0;
}
static struct iio_info ad9467_info = {
.read_raw = ad9467_read_raw,
.write_raw = ad9467_write_raw,
.update_scan_mode = ad9467_update_scan_mode,
.debugfs_reg_access = ad9467_reg_access,
.read_avail = ad9467_read_avail,
};
static int ad9467_scale_fill(struct ad9467_state *st)
{
const struct ad9467_chip_info *info = st->info;
unsigned int i, val1, val2;
st->scales = devm_kmalloc_array(&st->spi->dev, info->num_scales,
sizeof(*st->scales), GFP_KERNEL);
if (!st->scales)
return -ENOMEM;
for (i = 0; i < info->num_scales; i++) {
__ad9467_get_scale(st, i, &val1, &val2);
st->scales[i][0] = val1;
st->scales[i][1] = val2;
}
return 0;
}
static int ad9467_reset(struct device *dev)
{
struct gpio_desc *gpio;
gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR_OR_NULL(gpio))
return PTR_ERR_OR_ZERO(gpio);
fsleep(1);
gpiod_set_value_cansleep(gpio, 0);
fsleep(10 * USEC_PER_MSEC);
return 0;
}
static int ad9467_iio_backend_get(struct ad9467_state *st)
{
struct device *dev = &st->spi->dev;
struct device_node *__back;
st->back = devm_iio_backend_get(dev, NULL);
if (!IS_ERR(st->back))
return 0;
/* If not found, don't error out as we might have legacy DT property */
if (PTR_ERR(st->back) != -ENOENT)
return PTR_ERR(st->back);
/*
* if we don't get the backend using the normal API's, use the legacy
* 'adi,adc-dev' property. So we get all nodes with that property, and
* look for the one pointing at us. Then we directly lookup that fwnode
* on the backend list of registered devices. This is done so we don't
* make io-backends mandatory which would break DT ABI.
*/
for_each_node_with_property(__back, "adi,adc-dev") {
struct device_node *__me;
__me = of_parse_phandle(__back, "adi,adc-dev", 0);
if (!__me)
continue;
if (!device_match_of_node(dev, __me)) {
of_node_put(__me);
continue;
}
of_node_put(__me);
st->back = __devm_iio_backend_get_from_fwnode_lookup(dev,
of_fwnode_handle(__back));
of_node_put(__back);
return PTR_ERR_OR_ZERO(st->back);
}
return -ENODEV;
}
static int ad9467_test_mode_available_show(struct seq_file *s, void *ignored)
{
struct ad9467_state *st = s->private;
unsigned int bit;
for_each_set_bit(bit, &st->info->test_mask, st->info->test_mask_len)
seq_printf(s, "%s\n", ad9467_test_modes[bit]);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(ad9467_test_mode_available);
static ssize_t ad9467_chan_test_mode_read(struct file *file,
char __user *userbuf, size_t count,
loff_t *ppos)
{
struct ad9467_chan_test_mode *chan = file->private_data;
struct ad9467_state *st = chan->st;
char buf[128] = {0};
size_t len;
int ret;
if (chan->mode == AN877_ADC_TESTMODE_PN9_SEQ ||
chan->mode == AN877_ADC_TESTMODE_PN23_SEQ) {
len = scnprintf(buf, sizeof(buf), "Running \"%s\" Test:\n\t",
ad9467_test_modes[chan->mode]);
ret = iio_backend_debugfs_print_chan_status(st->back, chan->idx,
buf + len,
sizeof(buf) - len);
if (ret < 0)
return ret;
len += ret;
} else if (chan->mode == AN877_ADC_TESTMODE_OFF) {
len = scnprintf(buf, sizeof(buf), "No test Running...\n");
} else {
len = scnprintf(buf, sizeof(buf), "Running \"%s\" Test on CH:%u\n",
ad9467_test_modes[chan->mode], chan->idx);
}
return simple_read_from_buffer(userbuf, count, ppos, buf, len);
}
static ssize_t ad9467_chan_test_mode_write(struct file *file,
const char __user *userbuf,
size_t count, loff_t *ppos)
{
struct ad9467_chan_test_mode *chan = file->private_data;
struct ad9467_state *st = chan->st;
char test_mode[32] = {0};
unsigned int mode;
int ret;
ret = simple_write_to_buffer(test_mode, sizeof(test_mode) - 1, ppos,
userbuf, count);
if (ret < 0)
return ret;
for_each_set_bit(mode, &st->info->test_mask, st->info->test_mask_len) {
if (sysfs_streq(test_mode, ad9467_test_modes[mode]))
break;
}
if (mode == st->info->test_mask_len)
return -EINVAL;
guard(mutex)(&st->lock);
if (mode == AN877_ADC_TESTMODE_OFF) {
unsigned int out_mode;
if (chan->mode == AN877_ADC_TESTMODE_PN9_SEQ ||
chan->mode == AN877_ADC_TESTMODE_PN23_SEQ) {
ret = ad9467_backend_testmode_off(st, chan->idx);
if (ret)
return ret;
}
ret = ad9467_testmode_set(st, chan->idx, mode);
if (ret)
return ret;
out_mode = st->info->default_output_mode | AN877_ADC_OUTPUT_MODE_TWOS_COMPLEMENT;
ret = ad9467_outputmode_set(st, out_mode);
if (ret)
return ret;
} else {
ret = ad9467_outputmode_set(st, st->info->default_output_mode);
if (ret)
return ret;
ret = ad9467_testmode_set(st, chan->idx, mode);
if (ret)
return ret;
/* some patterns have a backend matching monitoring block */
if (mode == AN877_ADC_TESTMODE_PN9_SEQ) {
ret = ad9467_backend_testmode_on(st, chan->idx,
IIO_BACKEND_ADI_PRBS_9A);
if (ret)
return ret;
} else if (mode == AN877_ADC_TESTMODE_PN23_SEQ) {
ret = ad9467_backend_testmode_on(st, chan->idx,
IIO_BACKEND_ADI_PRBS_23A);
if (ret)
return ret;
}
}
chan->mode = mode;
return count;
}
static const struct file_operations ad9467_chan_test_mode_fops = {
.open = simple_open,
.read = ad9467_chan_test_mode_read,
.write = ad9467_chan_test_mode_write,
.llseek = default_llseek,
.owner = THIS_MODULE,
};
static ssize_t ad9467_dump_calib_table(struct file *file,
char __user *userbuf,
size_t count, loff_t *ppos)
{
struct ad9467_state *st = file->private_data;
unsigned int bit;
/* +2 for the newline and +1 for the string termination */
unsigned char map[AD9647_MAX_TEST_POINTS * 2 + 3];
ssize_t len = 0;
guard(mutex)(&st->lock);
if (*ppos)
goto out_read;
for (bit = 0; bit < st->calib_map_size; bit++) {
if (AD9467_CAN_INVERT(st) && bit == st->calib_map_size / 2)
len += scnprintf(map + len, sizeof(map) - len, "\n");
len += scnprintf(map + len, sizeof(map) - len, "%c",
test_bit(bit, st->calib_map) ? 'x' : 'o');
}
len += scnprintf(map + len, sizeof(map) - len, "\n");
out_read:
return simple_read_from_buffer(userbuf, count, ppos, map, len);
}
static const struct file_operations ad9467_calib_table_fops = {
.open = simple_open,
.read = ad9467_dump_calib_table,
.llseek = default_llseek,
.owner = THIS_MODULE,
};
static void ad9467_debugfs_init(struct iio_dev *indio_dev)
{
struct dentry *d = iio_get_debugfs_dentry(indio_dev);
struct ad9467_state *st = iio_priv(indio_dev);
char attr_name[32];
unsigned int chan;
if (!IS_ENABLED(CONFIG_DEBUG_FS))
return;
st->chan_test = devm_kcalloc(&st->spi->dev, st->info->num_channels,
sizeof(*st->chan_test), GFP_KERNEL);
if (!st->chan_test)
return;
debugfs_create_file("calibration_table_dump", 0400, d, st,
&ad9467_calib_table_fops);
for (chan = 0; chan < st->info->num_channels; chan++) {
snprintf(attr_name, sizeof(attr_name), "in_voltage%u_test_mode",
chan);
st->chan_test[chan].idx = chan;
st->chan_test[chan].st = st;
debugfs_create_file(attr_name, 0600, d, &st->chan_test[chan],
&ad9467_chan_test_mode_fops);
}
debugfs_create_file("in_voltage_test_mode_available", 0400, d, st,
&ad9467_test_mode_available_fops);
iio_backend_debugfs_add(st->back, indio_dev);
}
static int ad9467_probe(struct spi_device *spi)
{
struct iio_dev *indio_dev;
struct ad9467_state *st;
unsigned int id;
int ret;
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
if (!indio_dev)
return -ENOMEM;
st = iio_priv(indio_dev);
st->spi = spi;
st->info = spi_get_device_match_data(spi);
if (!st->info)
return -ENODEV;
st->calib_map_size = st->info->test_points;
if (AD9467_CAN_INVERT(st))
st->calib_map_size *= 2;
st->clk = devm_clk_get_enabled(&spi->dev, "adc-clk");
if (IS_ERR(st->clk))
return PTR_ERR(st->clk);
st->pwrdown_gpio = devm_gpiod_get_optional(&spi->dev, "powerdown",
GPIOD_OUT_LOW);
if (IS_ERR(st->pwrdown_gpio))
return PTR_ERR(st->pwrdown_gpio);
ret = ad9467_reset(&spi->dev);
if (ret)
return ret;
ret = ad9467_scale_fill(st);
if (ret)
return ret;
id = ad9467_spi_read(st, AN877_ADC_REG_CHIP_ID);
if (id != st->info->id) {
dev_err(&spi->dev, "Mismatch CHIP_ID, got 0x%X, expected 0x%X\n",
id, st->info->id);
return -ENODEV;
}
if (st->info->num_scales > 1)
ad9467_info.read_avail = ad9467_read_avail;
indio_dev->name = st->info->name;
indio_dev->channels = st->info->channels;
indio_dev->num_channels = st->info->num_channels;
indio_dev->info = &ad9467_info;
ret = ad9467_iio_backend_get(st);
if (ret)
return ret;
ret = devm_iio_backend_request_buffer(&spi->dev, st->back, indio_dev);
if (ret)
return ret;
ret = devm_iio_backend_enable(&spi->dev, st->back);
if (ret)
return ret;
ret = ad9467_calibrate(st);
if (ret)
return ret;
ret = devm_iio_device_register(&spi->dev, indio_dev);
if (ret)
return ret;
ad9467_debugfs_init(indio_dev);
return 0;
}
static const struct of_device_id ad9467_of_match[] = {
{ .compatible = "adi,ad9265", .data = &ad9265_chip_tbl, },
{ .compatible = "adi,ad9434", .data = &ad9434_chip_tbl, },
{ .compatible = "adi,ad9467", .data = &ad9467_chip_tbl, },
{ .compatible = "adi,ad9643", .data = &ad9643_chip_tbl, },
{ .compatible = "adi,ad9649", .data = &ad9649_chip_tbl, },
{ .compatible = "adi,ad9652", .data = &ad9652_chip_tbl, },
{ }
};
MODULE_DEVICE_TABLE(of, ad9467_of_match);
static const struct spi_device_id ad9467_ids[] = {
{ "ad9265", (kernel_ulong_t)&ad9265_chip_tbl },
{ "ad9434", (kernel_ulong_t)&ad9434_chip_tbl },
{ "ad9467", (kernel_ulong_t)&ad9467_chip_tbl },
{ "ad9643", (kernel_ulong_t)&ad9643_chip_tbl },
{ "ad9649", (kernel_ulong_t)&ad9649_chip_tbl, },
{ "ad9652", (kernel_ulong_t)&ad9652_chip_tbl, },
{ }
};
MODULE_DEVICE_TABLE(spi, ad9467_ids);
static struct spi_driver ad9467_driver = {
.driver = {
.name = "ad9467",
.of_match_table = ad9467_of_match,
},
.probe = ad9467_probe,
.id_table = ad9467_ids,
};
module_spi_driver(ad9467_driver);
MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
MODULE_DESCRIPTION("Analog Devices AD9467 ADC driver");
MODULE_LICENSE("GPL v2");
MODULE_IMPORT_NS(IIO_BACKEND);