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linuxdebug/drivers/iio/dac/ad7293.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0-only
/*
* AD7293 driver
*
* Copyright 2021 Analog Devices Inc.
*/
#include <linux/bitfield.h>
#include <linux/bits.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/iio/iio.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <linux/spi/spi.h>
#include <asm/unaligned.h>
#define AD7293_R1B BIT(16)
#define AD7293_R2B BIT(17)
#define AD7293_PAGE_ADDR_MSK GENMASK(15, 8)
#define AD7293_PAGE(x) FIELD_PREP(AD7293_PAGE_ADDR_MSK, x)
/* AD7293 Register Map Common */
#define AD7293_REG_NO_OP (AD7293_R1B | AD7293_PAGE(0x0) | 0x0)
#define AD7293_REG_PAGE_SELECT (AD7293_R1B | AD7293_PAGE(0x0) | 0x1)
#define AD7293_REG_CONV_CMD (AD7293_R2B | AD7293_PAGE(0x0) | 0x2)
#define AD7293_REG_RESULT (AD7293_R1B | AD7293_PAGE(0x0) | 0x3)
#define AD7293_REG_DAC_EN (AD7293_R1B | AD7293_PAGE(0x0) | 0x4)
#define AD7293_REG_DEVICE_ID (AD7293_R2B | AD7293_PAGE(0x0) | 0xC)
#define AD7293_REG_SOFT_RESET (AD7293_R2B | AD7293_PAGE(0x0) | 0xF)
/* AD7293 Register Map Page 0x0 */
#define AD7293_REG_VIN0 (AD7293_R2B | AD7293_PAGE(0x0) | 0x10)
#define AD7293_REG_VIN1 (AD7293_R2B | AD7293_PAGE(0x0) | 0x11)
#define AD7293_REG_VIN2 (AD7293_R2B | AD7293_PAGE(0x0) | 0x12)
#define AD7293_REG_VIN3 (AD7293_R2B | AD7293_PAGE(0x0) | 0x13)
#define AD7293_REG_TSENSE_INT (AD7293_R2B | AD7293_PAGE(0x0) | 0x20)
#define AD7293_REG_TSENSE_D0 (AD7293_R2B | AD7293_PAGE(0x0) | 0x21)
#define AD7293_REG_TSENSE_D1 (AD7293_R2B | AD7293_PAGE(0x0) | 0x22)
#define AD7293_REG_ISENSE_0 (AD7293_R2B | AD7293_PAGE(0x0) | 0x28)
#define AD7293_REG_ISENSE_1 (AD7293_R2B | AD7293_PAGE(0x0) | 0x29)
#define AD7293_REG_ISENSE_2 (AD7293_R2B | AD7293_PAGE(0x0) | 0x2A)
#define AD7293_REG_ISENSE_3 (AD7293_R2B | AD7293_PAGE(0x0) | 0x2B)
#define AD7293_REG_UNI_VOUT0 (AD7293_R2B | AD7293_PAGE(0x0) | 0x30)
#define AD7293_REG_UNI_VOUT1 (AD7293_R2B | AD7293_PAGE(0x0) | 0x31)
#define AD7293_REG_UNI_VOUT2 (AD7293_R2B | AD7293_PAGE(0x0) | 0x32)
#define AD7293_REG_UNI_VOUT3 (AD7293_R2B | AD7293_PAGE(0x0) | 0x33)
#define AD7293_REG_BI_VOUT0 (AD7293_R2B | AD7293_PAGE(0x0) | 0x34)
#define AD7293_REG_BI_VOUT1 (AD7293_R2B | AD7293_PAGE(0x0) | 0x35)
#define AD7293_REG_BI_VOUT2 (AD7293_R2B | AD7293_PAGE(0x0) | 0x36)
#define AD7293_REG_BI_VOUT3 (AD7293_R2B | AD7293_PAGE(0x0) | 0x37)
/* AD7293 Register Map Page 0x2 */
#define AD7293_REG_DIGITAL_OUT_EN (AD7293_R2B | AD7293_PAGE(0x2) | 0x11)
#define AD7293_REG_DIGITAL_INOUT_FUNC (AD7293_R2B | AD7293_PAGE(0x2) | 0x12)
#define AD7293_REG_DIGITAL_FUNC_POL (AD7293_R2B | AD7293_PAGE(0x2) | 0x13)
#define AD7293_REG_GENERAL (AD7293_R2B | AD7293_PAGE(0x2) | 0x14)
#define AD7293_REG_VINX_RANGE0 (AD7293_R2B | AD7293_PAGE(0x2) | 0x15)
#define AD7293_REG_VINX_RANGE1 (AD7293_R2B | AD7293_PAGE(0x2) | 0x16)
#define AD7293_REG_VINX_DIFF_SE (AD7293_R2B | AD7293_PAGE(0x2) | 0x17)
#define AD7293_REG_VINX_FILTER (AD7293_R2B | AD7293_PAGE(0x2) | 0x18)
#define AD7293_REG_BG_EN (AD7293_R2B | AD7293_PAGE(0x2) | 0x19)
#define AD7293_REG_CONV_DELAY (AD7293_R2B | AD7293_PAGE(0x2) | 0x1A)
#define AD7293_REG_TSENSE_BG_EN (AD7293_R2B | AD7293_PAGE(0x2) | 0x1B)
#define AD7293_REG_ISENSE_BG_EN (AD7293_R2B | AD7293_PAGE(0x2) | 0x1C)
#define AD7293_REG_ISENSE_GAIN (AD7293_R2B | AD7293_PAGE(0x2) | 0x1D)
#define AD7293_REG_DAC_SNOOZE_O (AD7293_R2B | AD7293_PAGE(0x2) | 0x1F)
#define AD7293_REG_DAC_SNOOZE_1 (AD7293_R2B | AD7293_PAGE(0x2) | 0x20)
#define AD7293_REG_RSX_MON_BG_EN (AD7293_R2B | AD7293_PAGE(0x2) | 0x23)
#define AD7293_REG_INTEGR_CL (AD7293_R2B | AD7293_PAGE(0x2) | 0x28)
#define AD7293_REG_PA_ON_CTRL (AD7293_R2B | AD7293_PAGE(0x2) | 0x29)
#define AD7293_REG_RAMP_TIME_0 (AD7293_R2B | AD7293_PAGE(0x2) | 0x2A)
#define AD7293_REG_RAMP_TIME_1 (AD7293_R2B | AD7293_PAGE(0x2) | 0x2B)
#define AD7293_REG_RAMP_TIME_2 (AD7293_R2B | AD7293_PAGE(0x2) | 0x2C)
#define AD7293_REG_RAMP_TIME_3 (AD7293_R2B | AD7293_PAGE(0x2) | 0x2D)
#define AD7293_REG_CL_FR_IT (AD7293_R2B | AD7293_PAGE(0x2) | 0x2E)
#define AD7293_REG_INTX_AVSS_AVDD (AD7293_R2B | AD7293_PAGE(0x2) | 0x2F)
/* AD7293 Register Map Page 0x3 */
#define AD7293_REG_VINX_SEQ (AD7293_R2B | AD7293_PAGE(0x3) | 0x10)
#define AD7293_REG_ISENSEX_TSENSEX_SEQ (AD7293_R2B | AD7293_PAGE(0x3) | 0x11)
#define AD7293_REG_RSX_MON_BI_VOUTX_SEQ (AD7293_R2B | AD7293_PAGE(0x3) | 0x12)
/* AD7293 Register Map Page 0xE */
#define AD7293_REG_VIN0_OFFSET (AD7293_R1B | AD7293_PAGE(0xE) | 0x10)
#define AD7293_REG_VIN1_OFFSET (AD7293_R1B | AD7293_PAGE(0xE) | 0x11)
#define AD7293_REG_VIN2_OFFSET (AD7293_R1B | AD7293_PAGE(0xE) | 0x12)
#define AD7293_REG_VIN3_OFFSET (AD7293_R1B | AD7293_PAGE(0xE) | 0x13)
#define AD7293_REG_TSENSE_INT_OFFSET (AD7293_R1B | AD7293_PAGE(0xE) | 0x20)
#define AD7293_REG_TSENSE_D0_OFFSET (AD7293_R1B | AD7293_PAGE(0xE) | 0x21)
#define AD7293_REG_TSENSE_D1_OFFSET (AD7293_R1B | AD7293_PAGE(0xE) | 0x22)
#define AD7293_REG_ISENSE0_OFFSET (AD7293_R1B | AD7293_PAGE(0xE) | 0x28)
#define AD7293_REG_ISENSE1_OFFSET (AD7293_R1B | AD7293_PAGE(0xE) | 0x29)
#define AD7293_REG_ISENSE2_OFFSET (AD7293_R1B | AD7293_PAGE(0xE) | 0x2A)
#define AD7293_REG_ISENSE3_OFFSET (AD7293_R1B | AD7293_PAGE(0xE) | 0x2B)
#define AD7293_REG_UNI_VOUT0_OFFSET (AD7293_R1B | AD7293_PAGE(0xE) | 0x30)
#define AD7293_REG_UNI_VOUT1_OFFSET (AD7293_R1B | AD7293_PAGE(0xE) | 0x31)
#define AD7293_REG_UNI_VOUT2_OFFSET (AD7293_R1B | AD7293_PAGE(0xE) | 0x32)
#define AD7293_REG_UNI_VOUT3_OFFSET (AD7293_R1B | AD7293_PAGE(0xE) | 0x33)
#define AD7293_REG_BI_VOUT0_OFFSET (AD7293_R1B | AD7293_PAGE(0xE) | 0x34)
#define AD7293_REG_BI_VOUT1_OFFSET (AD7293_R1B | AD7293_PAGE(0xE) | 0x35)
#define AD7293_REG_BI_VOUT2_OFFSET (AD7293_R1B | AD7293_PAGE(0xE) | 0x36)
#define AD7293_REG_BI_VOUT3_OFFSET (AD7293_R1B | AD7293_PAGE(0xE) | 0x37)
/* AD7293 Miscellaneous Definitions */
#define AD7293_READ BIT(7)
#define AD7293_TRANSF_LEN_MSK GENMASK(17, 16)
#define AD7293_REG_ADDR_MSK GENMASK(7, 0)
#define AD7293_REG_VOUT_OFFSET_MSK GENMASK(5, 4)
#define AD7293_REG_DATA_RAW_MSK GENMASK(15, 4)
#define AD7293_REG_VINX_RANGE_GET_CH_MSK(x, ch) (((x) >> (ch)) & 0x1)
#define AD7293_REG_VINX_RANGE_SET_CH_MSK(x, ch) (((x) & 0x1) << (ch))
#define AD7293_CHIP_ID 0x18
enum ad7293_ch_type {
AD7293_ADC_VINX,
AD7293_ADC_TSENSE,
AD7293_ADC_ISENSE,
AD7293_DAC,
};
enum ad7293_max_offset {
AD7293_TSENSE_MIN_OFFSET_CH = 4,
AD7293_ISENSE_MIN_OFFSET_CH = 7,
AD7293_VOUT_MIN_OFFSET_CH = 11,
AD7293_VOUT_MAX_OFFSET_CH = 18,
};
static const int dac_offset_table[] = {0, 1, 2};
static const int isense_gain_table[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
static const int adc_range_table[] = {0, 1, 2, 3};
struct ad7293_state {
struct spi_device *spi;
/* Protect against concurrent accesses to the device, page selection and data content */
struct mutex lock;
struct gpio_desc *gpio_reset;
struct regulator *reg_avdd;
struct regulator *reg_vdrive;
u8 page_select;
u8 data[3] __aligned(IIO_DMA_MINALIGN);
};
static int ad7293_page_select(struct ad7293_state *st, unsigned int reg)
{
int ret;
if (st->page_select != FIELD_GET(AD7293_PAGE_ADDR_MSK, reg)) {
st->data[0] = FIELD_GET(AD7293_REG_ADDR_MSK, AD7293_REG_PAGE_SELECT);
st->data[1] = FIELD_GET(AD7293_PAGE_ADDR_MSK, reg);
ret = spi_write(st->spi, &st->data[0], 2);
if (ret)
return ret;
st->page_select = FIELD_GET(AD7293_PAGE_ADDR_MSK, reg);
}
return 0;
}
static int __ad7293_spi_read(struct ad7293_state *st, unsigned int reg,
u16 *val)
{
int ret;
unsigned int length;
struct spi_transfer t = {0};
length = FIELD_GET(AD7293_TRANSF_LEN_MSK, reg);
ret = ad7293_page_select(st, reg);
if (ret)
return ret;
st->data[0] = AD7293_READ | FIELD_GET(AD7293_REG_ADDR_MSK, reg);
st->data[1] = 0x0;
st->data[2] = 0x0;
t.tx_buf = &st->data[0];
t.rx_buf = &st->data[0];
t.len = length + 1;
ret = spi_sync_transfer(st->spi, &t, 1);
if (ret)
return ret;
if (length == 1)
*val = st->data[1];
else
*val = get_unaligned_be16(&st->data[1]);
return 0;
}
static int ad7293_spi_read(struct ad7293_state *st, unsigned int reg,
u16 *val)
{
int ret;
mutex_lock(&st->lock);
ret = __ad7293_spi_read(st, reg, val);
mutex_unlock(&st->lock);
return ret;
}
static int __ad7293_spi_write(struct ad7293_state *st, unsigned int reg,
u16 val)
{
int ret;
unsigned int length;
length = FIELD_GET(AD7293_TRANSF_LEN_MSK, reg);
ret = ad7293_page_select(st, reg);
if (ret)
return ret;
st->data[0] = FIELD_GET(AD7293_REG_ADDR_MSK, reg);
if (length == 1)
st->data[1] = val;
else
put_unaligned_be16(val, &st->data[1]);
return spi_write(st->spi, &st->data[0], length + 1);
}
static int ad7293_spi_write(struct ad7293_state *st, unsigned int reg,
u16 val)
{
int ret;
mutex_lock(&st->lock);
ret = __ad7293_spi_write(st, reg, val);
mutex_unlock(&st->lock);
return ret;
}
static int __ad7293_spi_update_bits(struct ad7293_state *st, unsigned int reg,
u16 mask, u16 val)
{
int ret;
u16 data, temp;
ret = __ad7293_spi_read(st, reg, &data);
if (ret)
return ret;
temp = (data & ~mask) | (val & mask);
return __ad7293_spi_write(st, reg, temp);
}
static int ad7293_spi_update_bits(struct ad7293_state *st, unsigned int reg,
u16 mask, u16 val)
{
int ret;
mutex_lock(&st->lock);
ret = __ad7293_spi_update_bits(st, reg, mask, val);
mutex_unlock(&st->lock);
return ret;
}
static int ad7293_adc_get_scale(struct ad7293_state *st, unsigned int ch,
u16 *range)
{
int ret;
u16 data;
mutex_lock(&st->lock);
ret = __ad7293_spi_read(st, AD7293_REG_VINX_RANGE1, &data);
if (ret)
goto exit;
*range = AD7293_REG_VINX_RANGE_GET_CH_MSK(data, ch);
ret = __ad7293_spi_read(st, AD7293_REG_VINX_RANGE0, &data);
if (ret)
goto exit;
*range |= AD7293_REG_VINX_RANGE_GET_CH_MSK(data, ch) << 1;
exit:
mutex_unlock(&st->lock);
return ret;
}
static int ad7293_adc_set_scale(struct ad7293_state *st, unsigned int ch,
u16 range)
{
int ret;
unsigned int ch_msk = BIT(ch);
mutex_lock(&st->lock);
ret = __ad7293_spi_update_bits(st, AD7293_REG_VINX_RANGE1, ch_msk,
AD7293_REG_VINX_RANGE_SET_CH_MSK(range, ch));
if (ret)
goto exit;
ret = __ad7293_spi_update_bits(st, AD7293_REG_VINX_RANGE0, ch_msk,
AD7293_REG_VINX_RANGE_SET_CH_MSK((range >> 1), ch));
exit:
mutex_unlock(&st->lock);
return ret;
}
static int ad7293_get_offset(struct ad7293_state *st, unsigned int ch,
u16 *offset)
{
if (ch < AD7293_TSENSE_MIN_OFFSET_CH)
return ad7293_spi_read(st, AD7293_REG_VIN0_OFFSET + ch, offset);
else if (ch < AD7293_ISENSE_MIN_OFFSET_CH)
return ad7293_spi_read(st, AD7293_REG_TSENSE_INT_OFFSET + (ch - 4), offset);
else if (ch < AD7293_VOUT_MIN_OFFSET_CH)
return ad7293_spi_read(st, AD7293_REG_ISENSE0_OFFSET + (ch - 7), offset);
else if (ch <= AD7293_VOUT_MAX_OFFSET_CH)
return ad7293_spi_read(st, AD7293_REG_UNI_VOUT0_OFFSET + (ch - 11), offset);
return -EINVAL;
}
static int ad7293_set_offset(struct ad7293_state *st, unsigned int ch,
u16 offset)
{
if (ch < AD7293_TSENSE_MIN_OFFSET_CH)
return ad7293_spi_write(st, AD7293_REG_VIN0_OFFSET + ch,
offset);
else if (ch < AD7293_ISENSE_MIN_OFFSET_CH)
return ad7293_spi_write(st,
AD7293_REG_TSENSE_INT_OFFSET +
(ch - AD7293_TSENSE_MIN_OFFSET_CH),
offset);
else if (ch < AD7293_VOUT_MIN_OFFSET_CH)
return ad7293_spi_write(st,
AD7293_REG_ISENSE0_OFFSET +
(ch - AD7293_ISENSE_MIN_OFFSET_CH),
offset);
else if (ch <= AD7293_VOUT_MAX_OFFSET_CH)
return ad7293_spi_update_bits(st,
AD7293_REG_UNI_VOUT0_OFFSET +
(ch - AD7293_VOUT_MIN_OFFSET_CH),
AD7293_REG_VOUT_OFFSET_MSK,
FIELD_PREP(AD7293_REG_VOUT_OFFSET_MSK, offset));
return -EINVAL;
}
static int ad7293_isense_set_scale(struct ad7293_state *st, unsigned int ch,
u16 gain)
{
unsigned int ch_msk = (0xf << (4 * ch));
return ad7293_spi_update_bits(st, AD7293_REG_ISENSE_GAIN, ch_msk,
gain << (4 * ch));
}
static int ad7293_isense_get_scale(struct ad7293_state *st, unsigned int ch,
u16 *gain)
{
int ret;
ret = ad7293_spi_read(st, AD7293_REG_ISENSE_GAIN, gain);
if (ret)
return ret;
*gain = (*gain >> (4 * ch)) & 0xf;
return ret;
}
static int ad7293_dac_write_raw(struct ad7293_state *st, unsigned int ch,
u16 raw)
{
int ret;
mutex_lock(&st->lock);
ret = __ad7293_spi_update_bits(st, AD7293_REG_DAC_EN, BIT(ch), BIT(ch));
if (ret)
goto exit;
ret = __ad7293_spi_write(st, AD7293_REG_UNI_VOUT0 + ch,
FIELD_PREP(AD7293_REG_DATA_RAW_MSK, raw));
exit:
mutex_unlock(&st->lock);
return ret;
}
static int ad7293_ch_read_raw(struct ad7293_state *st, enum ad7293_ch_type type,
unsigned int ch, u16 *raw)
{
int ret;
unsigned int reg_wr, reg_rd, data_wr;
switch (type) {
case AD7293_ADC_VINX:
reg_wr = AD7293_REG_VINX_SEQ;
reg_rd = AD7293_REG_VIN0 + ch;
data_wr = BIT(ch);
break;
case AD7293_ADC_TSENSE:
reg_wr = AD7293_REG_ISENSEX_TSENSEX_SEQ;
reg_rd = AD7293_REG_TSENSE_INT + ch;
data_wr = BIT(ch);
break;
case AD7293_ADC_ISENSE:
reg_wr = AD7293_REG_ISENSEX_TSENSEX_SEQ;
reg_rd = AD7293_REG_ISENSE_0 + ch;
data_wr = BIT(ch) << 8;
break;
case AD7293_DAC:
reg_rd = AD7293_REG_UNI_VOUT0 + ch;
break;
default:
return -EINVAL;
}
mutex_lock(&st->lock);
if (type != AD7293_DAC) {
if (type == AD7293_ADC_TSENSE) {
ret = __ad7293_spi_write(st, AD7293_REG_TSENSE_BG_EN,
BIT(ch));
if (ret)
goto exit;
usleep_range(9000, 9900);
} else if (type == AD7293_ADC_ISENSE) {
ret = __ad7293_spi_write(st, AD7293_REG_ISENSE_BG_EN,
BIT(ch));
if (ret)
goto exit;
usleep_range(2000, 7000);
}
ret = __ad7293_spi_write(st, reg_wr, data_wr);
if (ret)
goto exit;
ret = __ad7293_spi_write(st, AD7293_REG_CONV_CMD, 0x82);
if (ret)
goto exit;
}
ret = __ad7293_spi_read(st, reg_rd, raw);
*raw = FIELD_GET(AD7293_REG_DATA_RAW_MSK, *raw);
exit:
mutex_unlock(&st->lock);
return ret;
}
static int ad7293_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long info)
{
struct ad7293_state *st = iio_priv(indio_dev);
int ret;
u16 data;
switch (info) {
case IIO_CHAN_INFO_RAW:
switch (chan->type) {
case IIO_VOLTAGE:
if (chan->output)
ret = ad7293_ch_read_raw(st, AD7293_DAC,
chan->channel, &data);
else
ret = ad7293_ch_read_raw(st, AD7293_ADC_VINX,
chan->channel, &data);
break;
case IIO_CURRENT:
ret = ad7293_ch_read_raw(st, AD7293_ADC_ISENSE,
chan->channel, &data);
break;
case IIO_TEMP:
ret = ad7293_ch_read_raw(st, AD7293_ADC_TSENSE,
chan->channel, &data);
break;
default:
return -EINVAL;
}
if (ret)
return ret;
*val = data;
return IIO_VAL_INT;
case IIO_CHAN_INFO_OFFSET:
switch (chan->type) {
case IIO_VOLTAGE:
if (chan->output) {
ret = ad7293_get_offset(st,
chan->channel + AD7293_VOUT_MIN_OFFSET_CH,
&data);
data = FIELD_GET(AD7293_REG_VOUT_OFFSET_MSK, data);
} else {
ret = ad7293_get_offset(st, chan->channel, &data);
}
break;
case IIO_CURRENT:
ret = ad7293_get_offset(st,
chan->channel + AD7293_ISENSE_MIN_OFFSET_CH,
&data);
break;
case IIO_TEMP:
ret = ad7293_get_offset(st,
chan->channel + AD7293_TSENSE_MIN_OFFSET_CH,
&data);
break;
default:
return -EINVAL;
}
if (ret)
return ret;
*val = data;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_VOLTAGE:
ret = ad7293_adc_get_scale(st, chan->channel, &data);
if (ret)
return ret;
*val = data;
return IIO_VAL_INT;
case IIO_CURRENT:
ret = ad7293_isense_get_scale(st, chan->channel, &data);
if (ret)
return ret;
*val = data;
return IIO_VAL_INT;
case IIO_TEMP:
*val = 1;
*val2 = 8;
return IIO_VAL_FRACTIONAL;
default:
return -EINVAL;
}
default:
return -EINVAL;
}
}
static int ad7293_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long info)
{
struct ad7293_state *st = iio_priv(indio_dev);
switch (info) {
case IIO_CHAN_INFO_RAW:
switch (chan->type) {
case IIO_VOLTAGE:
if (!chan->output)
return -EINVAL;
return ad7293_dac_write_raw(st, chan->channel, val);
default:
return -EINVAL;
}
case IIO_CHAN_INFO_OFFSET:
switch (chan->type) {
case IIO_VOLTAGE:
if (chan->output)
return ad7293_set_offset(st,
chan->channel +
AD7293_VOUT_MIN_OFFSET_CH,
val);
else
return ad7293_set_offset(st, chan->channel, val);
case IIO_CURRENT:
return ad7293_set_offset(st,
chan->channel +
AD7293_ISENSE_MIN_OFFSET_CH,
val);
case IIO_TEMP:
return ad7293_set_offset(st,
chan->channel +
AD7293_TSENSE_MIN_OFFSET_CH,
val);
default:
return -EINVAL;
}
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_VOLTAGE:
return ad7293_adc_set_scale(st, chan->channel, val);
case IIO_CURRENT:
return ad7293_isense_set_scale(st, chan->channel, val);
default:
return -EINVAL;
}
default:
return -EINVAL;
}
}
static int ad7293_reg_access(struct iio_dev *indio_dev,
unsigned int reg,
unsigned int write_val,
unsigned int *read_val)
{
struct ad7293_state *st = iio_priv(indio_dev);
int ret;
if (read_val) {
u16 temp;
ret = ad7293_spi_read(st, reg, &temp);
*read_val = temp;
} else {
ret = ad7293_spi_write(st, reg, (u16)write_val);
}
return ret;
}
static int ad7293_read_avail(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
const int **vals, int *type, int *length,
long info)
{
switch (info) {
case IIO_CHAN_INFO_OFFSET:
*vals = dac_offset_table;
*type = IIO_VAL_INT;
*length = ARRAY_SIZE(dac_offset_table);
return IIO_AVAIL_LIST;
case IIO_CHAN_INFO_SCALE:
*type = IIO_VAL_INT;
switch (chan->type) {
case IIO_VOLTAGE:
*vals = adc_range_table;
*length = ARRAY_SIZE(adc_range_table);
return IIO_AVAIL_LIST;
case IIO_CURRENT:
*vals = isense_gain_table;
*length = ARRAY_SIZE(isense_gain_table);
return IIO_AVAIL_LIST;
default:
return -EINVAL;
}
default:
return -EINVAL;
}
}
#define AD7293_CHAN_ADC(_channel) { \
.type = IIO_VOLTAGE, \
.output = 0, \
.indexed = 1, \
.channel = _channel, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_SCALE) | \
BIT(IIO_CHAN_INFO_OFFSET), \
.info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_SCALE) \
}
#define AD7293_CHAN_DAC(_channel) { \
.type = IIO_VOLTAGE, \
.output = 1, \
.indexed = 1, \
.channel = _channel, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_OFFSET), \
.info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_OFFSET) \
}
#define AD7293_CHAN_ISENSE(_channel) { \
.type = IIO_CURRENT, \
.output = 0, \
.indexed = 1, \
.channel = _channel, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_OFFSET) | \
BIT(IIO_CHAN_INFO_SCALE), \
.info_mask_shared_by_type_available = BIT(IIO_CHAN_INFO_SCALE) \
}
#define AD7293_CHAN_TEMP(_channel) { \
.type = IIO_TEMP, \
.output = 0, \
.indexed = 1, \
.channel = _channel, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_OFFSET), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) \
}
static const struct iio_chan_spec ad7293_channels[] = {
AD7293_CHAN_ADC(0),
AD7293_CHAN_ADC(1),
AD7293_CHAN_ADC(2),
AD7293_CHAN_ADC(3),
AD7293_CHAN_ISENSE(0),
AD7293_CHAN_ISENSE(1),
AD7293_CHAN_ISENSE(2),
AD7293_CHAN_ISENSE(3),
AD7293_CHAN_TEMP(0),
AD7293_CHAN_TEMP(1),
AD7293_CHAN_TEMP(2),
AD7293_CHAN_DAC(0),
AD7293_CHAN_DAC(1),
AD7293_CHAN_DAC(2),
AD7293_CHAN_DAC(3),
AD7293_CHAN_DAC(4),
AD7293_CHAN_DAC(5),
AD7293_CHAN_DAC(6),
AD7293_CHAN_DAC(7)
};
static int ad7293_soft_reset(struct ad7293_state *st)
{
int ret;
ret = __ad7293_spi_write(st, AD7293_REG_SOFT_RESET, 0x7293);
if (ret)
return ret;
return __ad7293_spi_write(st, AD7293_REG_SOFT_RESET, 0x0000);
}
static int ad7293_reset(struct ad7293_state *st)
{
if (st->gpio_reset) {
gpiod_set_value(st->gpio_reset, 0);
usleep_range(100, 1000);
gpiod_set_value(st->gpio_reset, 1);
usleep_range(100, 1000);
return 0;
}
/* Perform a software reset */
return ad7293_soft_reset(st);
}
static int ad7293_properties_parse(struct ad7293_state *st)
{
struct spi_device *spi = st->spi;
st->gpio_reset = devm_gpiod_get_optional(&st->spi->dev, "reset",
GPIOD_OUT_HIGH);
if (IS_ERR(st->gpio_reset))
return dev_err_probe(&spi->dev, PTR_ERR(st->gpio_reset),
"failed to get the reset GPIO\n");
st->reg_avdd = devm_regulator_get(&spi->dev, "avdd");
if (IS_ERR(st->reg_avdd))
return dev_err_probe(&spi->dev, PTR_ERR(st->reg_avdd),
"failed to get the AVDD voltage\n");
st->reg_vdrive = devm_regulator_get(&spi->dev, "vdrive");
if (IS_ERR(st->reg_vdrive))
return dev_err_probe(&spi->dev, PTR_ERR(st->reg_vdrive),
"failed to get the VDRIVE voltage\n");
return 0;
}
static void ad7293_reg_disable(void *data)
{
regulator_disable(data);
}
static int ad7293_init(struct ad7293_state *st)
{
int ret;
u16 chip_id;
struct spi_device *spi = st->spi;
ret = ad7293_properties_parse(st);
if (ret)
return ret;
ret = ad7293_reset(st);
if (ret)
return ret;
ret = regulator_enable(st->reg_avdd);
if (ret) {
dev_err(&spi->dev,
"Failed to enable specified AVDD Voltage!\n");
return ret;
}
ret = devm_add_action_or_reset(&spi->dev, ad7293_reg_disable,
st->reg_avdd);
if (ret)
return ret;
ret = regulator_enable(st->reg_vdrive);
if (ret) {
dev_err(&spi->dev,
"Failed to enable specified VDRIVE Voltage!\n");
return ret;
}
ret = devm_add_action_or_reset(&spi->dev, ad7293_reg_disable,
st->reg_vdrive);
if (ret)
return ret;
ret = regulator_get_voltage(st->reg_avdd);
if (ret < 0) {
dev_err(&spi->dev, "Failed to read avdd regulator: %d\n", ret);
return ret;
}
if (ret > 5500000 || ret < 4500000)
return -EINVAL;
ret = regulator_get_voltage(st->reg_vdrive);
if (ret < 0) {
dev_err(&spi->dev,
"Failed to read vdrive regulator: %d\n", ret);
return ret;
}
if (ret > 5500000 || ret < 1700000)
return -EINVAL;
/* Check Chip ID */
ret = __ad7293_spi_read(st, AD7293_REG_DEVICE_ID, &chip_id);
if (ret)
return ret;
if (chip_id != AD7293_CHIP_ID) {
dev_err(&spi->dev, "Invalid Chip ID.\n");
return -EINVAL;
}
return 0;
}
static const struct iio_info ad7293_info = {
.read_raw = ad7293_read_raw,
.write_raw = ad7293_write_raw,
.read_avail = &ad7293_read_avail,
.debugfs_reg_access = &ad7293_reg_access,
};
static int ad7293_probe(struct spi_device *spi)
{
struct iio_dev *indio_dev;
struct ad7293_state *st;
int ret;
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
if (!indio_dev)
return -ENOMEM;
st = iio_priv(indio_dev);
indio_dev->info = &ad7293_info;
indio_dev->name = "ad7293";
indio_dev->channels = ad7293_channels;
indio_dev->num_channels = ARRAY_SIZE(ad7293_channels);
st->spi = spi;
st->page_select = 0;
mutex_init(&st->lock);
ret = ad7293_init(st);
if (ret)
return ret;
return devm_iio_device_register(&spi->dev, indio_dev);
}
static const struct spi_device_id ad7293_id[] = {
{ "ad7293", 0 },
{}
};
MODULE_DEVICE_TABLE(spi, ad7293_id);
static const struct of_device_id ad7293_of_match[] = {
{ .compatible = "adi,ad7293" },
{}
};
MODULE_DEVICE_TABLE(of, ad7293_of_match);
static struct spi_driver ad7293_driver = {
.driver = {
.name = "ad7293",
.of_match_table = ad7293_of_match,
},
.probe = ad7293_probe,
.id_table = ad7293_id,
};
module_spi_driver(ad7293_driver);
MODULE_AUTHOR("Antoniu Miclaus <antoniu.miclaus@analog.com");
MODULE_DESCRIPTION("Analog Devices AD7293");
MODULE_LICENSE("GPL v2");