// SPDX-License-Identifier: GPL-2.0
/*
* AD7280A Lithium Ion Battery Monitoring System
*
* Copyright 2011 Analog Devices Inc.
*/
#include <linux/crc8.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/spi/spi.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
#include "ad7280a.h"
/* Registers */
#define AD7280A_CELL_VOLTAGE_1 0x0 /* D11 to D0, Read only */
#define AD7280A_CELL_VOLTAGE_2 0x1 /* D11 to D0, Read only */
#define AD7280A_CELL_VOLTAGE_3 0x2 /* D11 to D0, Read only */
#define AD7280A_CELL_VOLTAGE_4 0x3 /* D11 to D0, Read only */
#define AD7280A_CELL_VOLTAGE_5 0x4 /* D11 to D0, Read only */
#define AD7280A_CELL_VOLTAGE_6 0x5 /* D11 to D0, Read only */
#define AD7280A_AUX_ADC_1 0x6 /* D11 to D0, Read only */
#define AD7280A_AUX_ADC_2 0x7 /* D11 to D0, Read only */
#define AD7280A_AUX_ADC_3 0x8 /* D11 to D0, Read only */
#define AD7280A_AUX_ADC_4 0x9 /* D11 to D0, Read only */
#define AD7280A_AUX_ADC_5 0xA /* D11 to D0, Read only */
#define AD7280A_AUX_ADC_6 0xB /* D11 to D0, Read only */
#define AD7280A_SELF_TEST 0xC /* D11 to D0, Read only */
#define AD7280A_CONTROL_HB 0xD /* D15 to D8, Read/write */
#define AD7280A_CONTROL_LB 0xE /* D7 to D0, Read/write */
#define AD7280A_CELL_OVERVOLTAGE 0xF /* D7 to D0, Read/write */
#define AD7280A_CELL_UNDERVOLTAGE 0x10 /* D7 to D0, Read/write */
#define AD7280A_AUX_ADC_OVERVOLTAGE 0x11 /* D7 to D0, Read/write */
#define AD7280A_AUX_ADC_UNDERVOLTAGE 0x12 /* D7 to D0, Read/write */
#define AD7280A_ALERT 0x13 /* D7 to D0, Read/write */
#define AD7280A_CELL_BALANCE 0x14 /* D7 to D0, Read/write */
#define AD7280A_CB1_TIMER 0x15 /* D7 to D0, Read/write */
#define AD7280A_CB2_TIMER 0x16 /* D7 to D0, Read/write */
#define AD7280A_CB3_TIMER 0x17 /* D7 to D0, Read/write */
#define AD7280A_CB4_TIMER 0x18 /* D7 to D0, Read/write */
#define AD7280A_CB5_TIMER 0x19 /* D7 to D0, Read/write */
#define AD7280A_CB6_TIMER 0x1A /* D7 to D0, Read/write */
#define AD7280A_PD_TIMER 0x1B /* D7 to D0, Read/write */
#define AD7280A_READ 0x1C /* D7 to D0, Read/write */
#define AD7280A_CNVST_CONTROL 0x1D /* D7 to D0, Read/write */
/* Bits and Masks */
#define AD7280A_CTRL_HB_CONV_INPUT_ALL 0
#define AD7280A_CTRL_HB_CONV_INPUT_6CELL_AUX1_3_4 BIT(6)
#define AD7280A_CTRL_HB_CONV_INPUT_6CELL BIT(7)
#define AD7280A_CTRL_HB_CONV_INPUT_SELF_TEST (BIT(7) | BIT(6))
#define AD7280A_CTRL_HB_CONV_RES_READ_ALL 0
#define AD7280A_CTRL_HB_CONV_RES_READ_6CELL_AUX1_3_4 BIT(4)
#define AD7280A_CTRL_HB_CONV_RES_READ_6CELL BIT(5)
#define AD7280A_CTRL_HB_CONV_RES_READ_NO (BIT(5) | BIT(4))
#define AD7280A_CTRL_HB_CONV_START_CNVST 0
#define AD7280A_CTRL_HB_CONV_START_CS BIT(3)
#define AD7280A_CTRL_HB_CONV_AVG_DIS 0
#define AD7280A_CTRL_HB_CONV_AVG_2 BIT(1)
#define AD7280A_CTRL_HB_CONV_AVG_4 BIT(2)
#define AD7280A_CTRL_HB_CONV_AVG_8 (BIT(2) | BIT(1))
#define AD7280A_CTRL_HB_CONV_AVG(x) ((x) << 1)
#define AD7280A_CTRL_HB_PWRDN_SW BIT(0)
#define AD7280A_CTRL_LB_SWRST BIT(7)
#define AD7280A_CTRL_LB_ACQ_TIME_400ns 0
#define AD7280A_CTRL_LB_ACQ_TIME_800ns BIT(5)
#define AD7280A_CTRL_LB_ACQ_TIME_1200ns BIT(6)
#define AD7280A_CTRL_LB_ACQ_TIME_1600ns (BIT(6) | BIT(5))
#define AD7280A_CTRL_LB_ACQ_TIME(x) ((x) << 5)
#define AD7280A_CTRL_LB_MUST_SET BIT(4)
#define AD7280A_CTRL_LB_THERMISTOR_EN BIT(3)
#define AD7280A_CTRL_LB_LOCK_DEV_ADDR BIT(2)
#define AD7280A_CTRL_LB_INC_DEV_ADDR BIT(1)
#define AD7280A_CTRL_LB_DAISY_CHAIN_RB_EN BIT(0)
#define AD7280A_ALERT_GEN_STATIC_HIGH BIT(6)
#define AD7280A_ALERT_RELAY_SIG_CHAIN_DOWN (BIT(7) | BIT(6))
#define AD7280A_ALL_CELLS (0xAD << 16)
#define AD7280A_MAX_SPI_CLK_HZ 700000 /* < 1MHz */
#define AD7280A_MAX_CHAIN 8
#define AD7280A_CELLS_PER_DEV 6
#define AD7280A_BITS 12
#define AD7280A_NUM_CH (AD7280A_AUX_ADC_6 - \
AD7280A_CELL_VOLTAGE_1 + 1)
#define AD7280A_CALC_VOLTAGE_CHAN_NUM(d, c) (((d) * AD7280A_CELLS_PER_DEV) + \
(c))
#define AD7280A_CALC_TEMP_CHAN_NUM(d, c) (((d) * AD7280A_CELLS_PER_DEV) + \
(c) - AD7280A_CELLS_PER_DEV)
#define AD7280A_DEVADDR_MASTER 0
#define AD7280A_DEVADDR_ALL 0x1F
/* 5-bit device address is sent LSB first */
static unsigned int ad7280a_devaddr(unsigned int addr)
{
return ((addr & 0x1) << 4) |
((addr & 0x2) << 3) |
(addr & 0x4) |
((addr & 0x8) >> 3) |
((addr & 0x10) >> 4);
}
/* During a read a valid write is mandatory.
* So writing to the highest available address (Address 0x1F)
* and setting the address all parts bit to 0 is recommended
* So the TXVAL is AD7280A_DEVADDR_ALL + CRC
*/
#define AD7280A_READ_TXVAL 0xF800030A
/*
* AD7280 CRC
*
* P(x) = x^8 + x^5 + x^3 + x^2 + x^1 + x^0 = 0b100101111 => 0x2F
*/
#define POLYNOM 0x2F
struct ad7280_state {
struct spi_device *spi;
struct iio_chan_spec *channels;
struct iio_dev_attr *iio_attr;
int slave_num;
int scan_cnt;
int readback_delay_us;
unsigned char crc_tab[CRC8_TABLE_SIZE];
unsigned char ctrl_hb;
unsigned char ctrl_lb;
unsigned char cell_threshhigh;
unsigned char cell_threshlow;
unsigned char aux_threshhigh;
unsigned char aux_threshlow;
unsigned char cb_mask[AD7280A_MAX_CHAIN];
struct mutex lock; /* protect sensor state */
__be32 buf[2] ____cacheline_aligned;
};
static unsigned char ad7280_calc_crc8(unsigned char *crc_tab, unsigned int val)
{
unsigned char crc;
crc = crc_tab[val >> 16 & 0xFF];
crc = crc_tab[crc ^ (val >> 8 & 0xFF)];
return crc ^ (val & 0xFF);
}
static int ad7280_check_crc(struct ad7280_state *st, unsigned int val)
{
unsigned char crc = ad7280_calc_crc8(st->crc_tab, val >> 10);
if (crc != ((val >> 2) & 0xFF))
return -EIO;
return 0;
}
/* After initiating a conversion sequence we need to wait until the
* conversion is done. The delay is typically in the range of 15..30 us
* however depending an the number of devices in the daisy chain and the
* number of averages taken, conversion delays and acquisition time options
* it may take up to 250us, in this case we better sleep instead of busy
* wait.
*/
static void ad7280_delay(struct ad7280_state *st)
{
if (st->readback_delay_us < 50)
udelay(st->readback_delay_us);
else
usleep_range(250, 500);
}
static int __ad7280_read32(struct ad7280_state *st, unsigned int *val)
{
int ret;
struct spi_transfer t = {
.tx_buf = &st->buf[0],
.rx_buf = &st->buf[1],
.len = 4,
};
st->buf[0] = cpu_to_be32(AD7280A_READ_TXVAL);
ret = spi_sync_transfer(st->spi, &t, 1);
if (ret)
return ret;
*val = be32_to_cpu(st->buf[1]);
return 0;
}
static int ad7280_write(struct ad7280_state *st, unsigned int devaddr,
unsigned int addr, bool all, unsigned int val)
{
unsigned int reg = devaddr << 27 | addr << 21 |
(val & 0xFF) << 13 | all << 12;
reg |= ad7280_calc_crc8(st->crc_tab, reg >> 11) << 3 | 0x2;
st->buf[0] = cpu_to_be32(reg);
return spi_write(st->spi, &st->buf[0], 4);
}
static int ad7280_read(struct ad7280_state *st, unsigned int devaddr,
unsigned int addr)
{
int ret;
unsigned int tmp;
/* turns off the read operation on all parts */
ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CONTROL_HB, 1,
AD7280A_CTRL_HB_CONV_INPUT_ALL |
AD7280A_CTRL_HB_CONV_RES_READ_NO |
st->ctrl_hb);
if (ret)
return ret;
/* turns on the read operation on the addressed part */
ret = ad7280_write(st, devaddr, AD7280A_CONTROL_HB, 0,
AD7280A_CTRL_HB_CONV_INPUT_ALL |
AD7280A_CTRL_HB_CONV_RES_READ_ALL |
st->ctrl_hb);
if (ret)
return ret;
/* Set register address on the part to be read from */
ret = ad7280_write(st, devaddr, AD7280A_READ, 0, addr << 2);
if (ret)
return ret;
ret = __ad7280_read32(st, &tmp);
if (ret)
return ret;
if (ad7280_check_crc(st, tmp))
return -EIO;
if (((tmp >> 27) != devaddr) || (((tmp >> 21) & 0x3F) != addr))
return -EFAULT;
return (tmp >> 13) & 0xFF;
}
static int ad7280_read_channel(struct ad7280_state *st, unsigned int devaddr,
unsigned int addr)
{
int ret;
unsigned int tmp;
ret = ad7280_write(st, devaddr, AD7280A_READ, 0, addr << 2);
if (ret)
return ret;
ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CONTROL_HB, 1,
AD7280A_CTRL_HB_CONV_INPUT_ALL |
AD7280A_CTRL_HB_CONV_RES_READ_NO |
st->ctrl_hb);
if (ret)
return ret;
ret = ad7280_write(st, devaddr, AD7280A_CONTROL_HB, 0,
AD7280A_CTRL_HB_CONV_INPUT_ALL |
AD7280A_CTRL_HB_CONV_RES_READ_ALL |
AD7280A_CTRL_HB_CONV_START_CS |
st->ctrl_hb);
if (ret)
return ret;
ad7280_delay(st);
ret = __ad7280_read32(st, &tmp);
if (ret)
return ret;
if (ad7280_check_crc(st, tmp))
return -EIO;
if (((tmp >> 27) != devaddr) || (((tmp >> 23) & 0xF) != addr))
return -EFAULT;
return (tmp >> 11) & 0xFFF;
}
static int ad7280_read_all_channels(struct ad7280_state *st, unsigned int cnt,
unsigned int *array)
{
int i, ret;
unsigned int tmp, sum = 0;
ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_READ, 1,
AD7280A_CELL_VOLTAGE_1 << 2);
if (ret)
return ret;
ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CONTROL_HB, 1,
AD7280A_CTRL_HB_CONV_INPUT_ALL |
AD7280A_CTRL_HB_CONV_RES_READ_ALL |
AD7280A_CTRL_HB_CONV_START_CS |
st->ctrl_hb);
if (ret)
return ret;
ad7280_delay(st);
for (i = 0; i < cnt; i++) {
ret = __ad7280_read32(st, &tmp);
if (ret)
return ret;
if (ad7280_check_crc(st, tmp))
return -EIO;
if (array)
array[i] = tmp;
/* only sum cell voltages */
if (((tmp >> 23) & 0xF) <= AD7280A_CELL_VOLTAGE_6)
sum += ((tmp >> 11) & 0xFFF);
}
return sum;
}
static void ad7280_sw_power_down(void *data)
{
struct ad7280_state *st = data;
ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CONTROL_HB, 1,
AD7280A_CTRL_HB_PWRDN_SW | st->ctrl_hb);
}
static int ad7280_chain_setup(struct ad7280_state *st)
{
unsigned int val, n;
int ret;
ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CONTROL_LB, 1,
AD7280A_CTRL_LB_DAISY_CHAIN_RB_EN |
AD7280A_CTRL_LB_LOCK_DEV_ADDR |
AD7280A_CTRL_LB_MUST_SET |
AD7280A_CTRL_LB_SWRST |
st->ctrl_lb);
if (ret)
return ret;
ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CONTROL_LB, 1,
AD7280A_CTRL_LB_DAISY_CHAIN_RB_EN |
AD7280A_CTRL_LB_LOCK_DEV_ADDR |
AD7280A_CTRL_LB_MUST_SET |
st->ctrl_lb);
if (ret)
goto error_power_down;
ret = ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_READ, 1,
AD7280A_CONTROL_LB << 2);
if (ret)
goto error_power_down;
for (n = 0; n <= AD7280A_MAX_CHAIN; n++) {
ret = __ad7280_read32(st, &val);
if (ret)
goto error_power_down;
if (val == 0)
return n - 1;
if (ad7280_check_crc(st, val)) {
ret = -EIO;
goto error_power_down;
}
if (n != ad7280a_devaddr(val >> 27)) {
ret = -EIO;
goto error_power_down;
}
}
ret = -EFAULT;
error_power_down:
ad7280_write(st, AD7280A_DEVADDR_MASTER, AD7280A_CONTROL_HB, 1,
AD7280A_CTRL_HB_PWRDN_SW | st->ctrl_hb);
return ret;
}
static ssize_t ad7280_show_balance_sw(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad7280_state *st = iio_priv(indio_dev);
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
return sprintf(buf, "%d\n",
!!(st->cb_mask[this_attr->address >> 8] &
(1 << ((this_attr->address & 0xFF) + 2))));
}
static ssize_t ad7280_store_balance_sw(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad7280_state *st = iio_priv(indio_dev);
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
bool readin;
int ret;
unsigned int devaddr, ch;
ret = strtobool(buf, &readin);
if (ret)
return ret;
devaddr = this_attr->address >> 8;
ch = this_attr->address & 0xFF;
mutex_lock(&st->lock);
if (readin)
st->cb_mask[devaddr] |= 1 << (ch + 2);
else
st->cb_mask[devaddr] &= ~(1 << (ch + 2));
ret = ad7280_write(st, devaddr, AD7280A_CELL_BALANCE,
0, st->cb_mask[devaddr]);
mutex_unlock(&st->lock);
return ret ? ret : len;
}
static ssize_t ad7280_show_balance_timer(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad7280_state *st = iio_priv(indio_dev);
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
int ret;
unsigned int msecs;
mutex_lock(&st->lock);
ret = ad7280_read(st, this_attr->address >> 8,
this_attr->address & 0xFF);
mutex_unlock(&st->lock);
if (ret < 0)
return ret;
msecs = (ret >> 3) * 71500;
return sprintf(buf, "%u\n", msecs);
}
static ssize_t ad7280_store_balance_timer(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad7280_state *st = iio_priv(indio_dev);
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
unsigned long val;
int ret;
ret = kstrtoul(buf, 10, &val);
if (ret)
return ret;
val /= 71500;
if (val > 31)
return -EINVAL;
mutex_lock(&st->lock);
ret = ad7280_write(st, this_attr->address >> 8,
this_attr->address & 0xFF,
0, (val & 0x1F) << 3);
mutex_unlock(&st->lock);
return ret ? ret : len;
}
static struct attribute *ad7280_attributes[AD7280A_MAX_CHAIN *
AD7280A_CELLS_PER_DEV * 2 + 1];
static const struct attribute_group ad7280_attrs_group = {
.attrs = ad7280_attributes,
};
static void ad7280_voltage_channel_init(struct iio_chan_spec *chan, int i)
{
chan->type = IIO_VOLTAGE;
chan->differential = 1;
chan->channel = i;
chan->channel2 = chan->channel + 1;
}
static void ad7280_temp_channel_init(struct iio_chan_spec *chan, int i)
{
chan->type = IIO_TEMP;
chan->channel = i;
}
static void ad7280_common_fields_init(struct iio_chan_spec *chan, int addr,
int cnt)
{
chan->indexed = 1;
chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE);
chan->address = addr;
chan->scan_index = cnt;
chan->scan_type.sign = 'u';
chan->scan_type.realbits = 12;
chan->scan_type.storagebits = 32;
}
static void ad7280_total_voltage_channel_init(struct iio_chan_spec *chan,
int cnt, int dev)
{
chan->type = IIO_VOLTAGE;
chan->differential = 1;
chan->channel = 0;
chan->channel2 = dev * AD7280A_CELLS_PER_DEV;
chan->address = AD7280A_ALL_CELLS;
chan->indexed = 1;
chan->info_mask_separate = BIT(IIO_CHAN_INFO_RAW);
chan->info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE);
chan->scan_index = cnt;
chan->scan_type.sign = 'u';
chan->scan_type.realbits = 32;
chan->scan_type.storagebits = 32;
}
static void ad7280_timestamp_channel_init(struct iio_chan_spec *chan, int cnt)
{
chan->type = IIO_TIMESTAMP;
chan->channel = -1;
chan->scan_index = cnt;
chan->scan_type.sign = 's';
chan->scan_type.realbits = 64;
chan->scan_type.storagebits = 64;
}
static void ad7280_init_dev_channels(struct ad7280_state *st, int dev, int *cnt)
{
int addr, ch, i;
struct iio_chan_spec *chan;
for (ch = AD7280A_CELL_VOLTAGE_1; ch <= AD7280A_AUX_ADC_6; ch++) {
chan = &st->channels[*cnt];
if (ch < AD7280A_AUX_ADC_1) {
i = AD7280A_CALC_VOLTAGE_CHAN_NUM(dev, ch);
ad7280_voltage_channel_init(chan, i);
} else {
i = AD7280A_CALC_TEMP_CHAN_NUM(dev, ch);
ad7280_temp_channel_init(chan, i);
}
addr = ad7280a_devaddr(dev) << 8 | ch;
ad7280_common_fields_init(chan, addr, *cnt);
(*cnt)++;
}
}
static int ad7280_channel_init(struct ad7280_state *st)
{
int dev, cnt = 0;
st->channels = devm_kcalloc(&st->spi->dev, (st->slave_num + 1) * 12 + 2,
sizeof(*st->channels), GFP_KERNEL);
if (!st->channels)
return -ENOMEM;
for (dev = 0; dev <= st->slave_num; dev++)
ad7280_init_dev_channels(st, dev, &cnt);
ad7280_total_voltage_channel_init(&st->channels[cnt], cnt, dev);
cnt++;
ad7280_timestamp_channel_init(&st->channels[cnt], cnt);
return cnt + 1;
}
static int ad7280_balance_switch_attr_init(struct iio_dev_attr *attr,
struct device *dev, int addr, int i)
{
attr->address = addr;
attr->dev_attr.attr.mode = 0644;
attr->dev_attr.show = ad7280_show_balance_sw;
attr->dev_attr.store = ad7280_store_balance_sw;
attr->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
"in%d-in%d_balance_switch_en",
i, i + 1);
if (!attr->dev_attr.attr.name)
return -ENOMEM;
return 0;
}
static int ad7280_balance_timer_attr_init(struct iio_dev_attr *attr,
struct device *dev, int addr, int i)
{
attr->address = addr;
attr->dev_attr.attr.mode = 0644;
attr->dev_attr.show = ad7280_show_balance_timer;
attr->dev_attr.store = ad7280_store_balance_timer;
attr->dev_attr.attr.name = devm_kasprintf(dev, GFP_KERNEL,
"in%d-in%d_balance_timer",
i, i + 1);
if (!attr->dev_attr.attr.name)
return -ENOMEM;
return 0;
}
static int ad7280_init_dev_attrs(struct ad7280_state *st, int dev, int *cnt)
{
int addr, ch, i, ret;
struct iio_dev_attr *iio_attr;
struct device *sdev = &st->spi->dev;
for (ch = AD7280A_CELL_VOLTAGE_1; ch <= AD7280A_CELL_VOLTAGE_6; ch++) {
iio_attr = &st->iio_attr[*cnt];
addr = ad7280a_devaddr(dev) << 8 | ch;
i = dev * AD7280A_CELLS_PER_DEV + ch;
ret = ad7280_balance_switch_attr_init(iio_attr, sdev, addr, i);
if (ret < 0)
return ret;
ad7280_attributes[*cnt] = &iio_attr->dev_attr.attr;
(*cnt)++;
iio_attr = &st->iio_attr[*cnt];
addr = ad7280a_devaddr(dev) << 8 | (AD7280A_CB1_TIMER + ch);
ret = ad7280_balance_timer_attr_init(iio_attr, sdev, addr, i);
if (ret < 0)
return ret;
ad7280_attributes[*cnt] = &iio_attr->dev_attr.attr;
(*cnt)++;
}
ad7280_attributes[*cnt] = NULL;
return 0;
}
static int ad7280_attr_init(struct ad7280_state *st)
{
int dev, cnt = 0, ret;
st->iio_attr = devm_kcalloc(&st->spi->dev, 2, sizeof(*st->iio_attr) *
(st->slave_num + 1) * AD7280A_CELLS_PER_DEV,
GFP_KERNEL);
if (!st->iio_attr)
return -ENOMEM;
for (dev = 0; dev <= st->slave_num; dev++) {
ret = ad7280_init_dev_attrs(st, dev, &cnt);
if (ret < 0)
return ret;
}
return 0;
}
static ssize_t ad7280_read_channel_config(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad7280_state *st = iio_priv(indio_dev);
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
unsigned int val;
switch (this_attr->address) {
case AD7280A_CELL_OVERVOLTAGE:
val = 1000 + (st->cell_threshhigh * 1568) / 100;
break;
case AD7280A_CELL_UNDERVOLTAGE:
val = 1000 + (st->cell_threshlow * 1568) / 100;
break;
case AD7280A_AUX_ADC_OVERVOLTAGE:
val = (st->aux_threshhigh * 196) / 10;
break;
case AD7280A_AUX_ADC_UNDERVOLTAGE:
val = (st->aux_threshlow * 196) / 10;
break;
default:
return -EINVAL;
}
return sprintf(buf, "%u\n", val);
}
static ssize_t ad7280_write_channel_config(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct ad7280_state *st = iio_priv(indio_dev);
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
long val;
int ret;
ret = kstrtol(buf, 10, &val);
if (ret)
return ret;
switch (this_attr->address) {
case AD7280A_CELL_OVERVOLTAGE:
case AD7280A_CELL_UNDERVOLTAGE:
val = ((val - 1000) * 100) / 1568; /* LSB 15.68mV */
break;
case AD7280A_AUX_ADC_OVERVOLTAGE:
case AD7280A_AUX_ADC_UNDERVOLTAGE:
val = (val * 10) / 196; /* LSB 19.6mV */
break;
default:
return -EFAULT;
}
val = clamp(val, 0L, 0xFFL);
mutex_lock(&st->lock);
switch (this_attr->address) {
case AD7280A_CELL_OVERVOLTAGE:
st->cell_threshhigh = val;
break;
case AD7280A_CELL_UNDERVOLTAGE:
st->cell_threshlow = val;
break;
case AD7280A_AUX_ADC_OVERVOLTAGE:
st->aux_threshhigh = val;
break;
case AD7280A_AUX_ADC_UNDERVOLTAGE:
st->aux_threshlow = val;
break;
}
ret = ad7280_write(st, AD7280A_DEVADDR_MASTER,
this_attr->address, 1, val);
mutex_unlock(&st->lock);
return ret ? ret : len;
}
static irqreturn_t ad7280_event_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct ad7280_state *st = iio_priv(indio_dev);
unsigned int *channels;
int i, ret;
channels = kcalloc(st->scan_cnt, sizeof(*channels), GFP_KERNEL);
if (!channels)
return IRQ_HANDLED;
ret = ad7280_read_all_channels(st, st->scan_cnt, channels);
if (ret < 0)
goto out;
for (i = 0; i < st->scan_cnt; i++) {
if (((channels[i] >> 23) & 0xF) <= AD7280A_CELL_VOLTAGE_6) {
if (((channels[i] >> 11) & 0xFFF) >=
st->cell_threshhigh) {
u64 tmp = IIO_EVENT_CODE(IIO_VOLTAGE, 1, 0,
IIO_EV_DIR_RISING,
IIO_EV_TYPE_THRESH,
0, 0, 0);
iio_push_event(indio_dev, tmp,
iio_get_time_ns(indio_dev));
} else if (((channels[i] >> 11) & 0xFFF) <=
st->cell_threshlow) {
u64 tmp = IIO_EVENT_CODE(IIO_VOLTAGE, 1, 0,
IIO_EV_DIR_FALLING,
IIO_EV_TYPE_THRESH,
0, 0, 0);
iio_push_event(indio_dev, tmp,
iio_get_time_ns(indio_dev));
}
} else {
if (((channels[i] >> 11) & 0xFFF) >=
st->aux_threshhigh) {
u64 tmp = IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0,
IIO_EV_TYPE_THRESH,
IIO_EV_DIR_RISING);
iio_push_event(indio_dev, tmp,
iio_get_time_ns(indio_dev));
} else if (((channels[i] >> 11) & 0xFFF) <=
st->aux_threshlow) {
u64 tmp = IIO_UNMOD_EVENT_CODE(IIO_TEMP, 0,
IIO_EV_TYPE_THRESH,
IIO_EV_DIR_FALLING);
iio_push_event(indio_dev, tmp,
iio_get_time_ns(indio_dev));
}
}
}
out:
kfree(channels);
return IRQ_HANDLED;
}
/* Note: No need to fix checkpatch warning that reads:
* CHECK: spaces preferred around that '-' (ctx:VxV)
* The function argument is stringified and doesn't need a fix
*/
static IIO_DEVICE_ATTR_NAMED(in_thresh_low_value,
in_voltage-voltage_thresh_low_value,
0644,
ad7280_read_channel_config,
ad7280_write_channel_config,
AD7280A_CELL_UNDERVOLTAGE);
static IIO_DEVICE_ATTR_NAMED(in_thresh_high_value,
in_voltage-voltage_thresh_high_value,
0644,
ad7280_read_channel_config,
ad7280_write_channel_config,
AD7280A_CELL_OVERVOLTAGE);
static IIO_DEVICE_ATTR(in_temp_thresh_low_value,
0644,
ad7280_read_channel_config,
ad7280_write_channel_config,
AD7280A_AUX_ADC_UNDERVOLTAGE);
static IIO_DEVICE_ATTR(in_temp_thresh_high_value,
0644,
ad7280_read_channel_config,
ad7280_write_channel_config,
AD7280A_AUX_ADC_OVERVOLTAGE);
static struct attribute *ad7280_event_attributes[] = {
&iio_dev_attr_in_thresh_low_value.dev_attr.attr,
&iio_dev_attr_in_thresh_high_value.dev_attr.attr,
&iio_dev_attr_in_temp_thresh_low_value.dev_attr.attr,
&iio_dev_attr_in_temp_thresh_high_value.dev_attr.attr,
NULL,
};
static const struct attribute_group ad7280_event_attrs_group = {
.attrs = ad7280_event_attributes,
};
static int ad7280_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
int *val2,
long m)
{
struct ad7280_state *st = iio_priv(indio_dev);
int ret;
switch (m) {
case IIO_CHAN_INFO_RAW:
mutex_lock(&st->lock);
if (chan->address == AD7280A_ALL_CELLS)
ret = ad7280_read_all_channels(st, st->scan_cnt, NULL);
else
ret = ad7280_read_channel(st, chan->address >> 8,
chan->address & 0xFF);
mutex_unlock(&st->lock);
if (ret < 0)
return ret;
*val = ret;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
if ((chan->address & 0xFF) <= AD7280A_CELL_VOLTAGE_6)
*val = 4000;
else
*val = 5000;
*val2 = AD7280A_BITS;
return IIO_VAL_FRACTIONAL_LOG2;
}
return -EINVAL;
}
static const struct iio_info ad7280_info = {
.read_raw = ad7280_read_raw,
.event_attrs = &ad7280_event_attrs_group,
.attrs = &ad7280_attrs_group,
};
static const struct ad7280_platform_data ad7793_default_pdata = {
.acquisition_time = AD7280A_ACQ_TIME_400ns,
.conversion_averaging = AD7280A_CONV_AVG_DIS,
.thermistor_term_en = true,
};
static int ad7280_probe(struct spi_device *spi)
{
const struct ad7280_platform_data *pdata = dev_get_platdata(&spi->dev);
struct ad7280_state *st;
int ret;
const unsigned short t_acq_ns[4] = {465, 1010, 1460, 1890};
const unsigned short n_avg[4] = {1, 2, 4, 8};
struct iio_dev *indio_dev;
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
if (!indio_dev)
return -ENOMEM;
st = iio_priv(indio_dev);
spi_set_drvdata(spi, indio_dev);
st->spi = spi;
mutex_init(&st->lock);
if (!pdata)
pdata = &ad7793_default_pdata;
crc8_populate_msb(st->crc_tab, POLYNOM);
st->spi->max_speed_hz = AD7280A_MAX_SPI_CLK_HZ;
st->spi->mode = SPI_MODE_1;
spi_setup(st->spi);
st->ctrl_lb = AD7280A_CTRL_LB_ACQ_TIME(pdata->acquisition_time & 0x3);
st->ctrl_hb = AD7280A_CTRL_HB_CONV_AVG(pdata->conversion_averaging
& 0x3) | (pdata->thermistor_term_en ?
AD7280A_CTRL_LB_THERMISTOR_EN : 0);
ret = ad7280_chain_setup(st);
if (ret < 0)
return ret;
st->slave_num = ret;
st->scan_cnt = (st->slave_num + 1) * AD7280A_NUM_CH;
st->cell_threshhigh = 0xFF;
st->aux_threshhigh = 0xFF;
ret = devm_add_action_or_reset(&spi->dev, ad7280_sw_power_down, st);
if (ret)
return ret;
/*
* Total Conversion Time = ((tACQ + tCONV) *
* (Number of Conversions per Part)) −
* tACQ + ((N - 1) * tDELAY)
*
* Readback Delay = Total Conversion Time + tWAIT
*/
st->readback_delay_us =
((t_acq_ns[pdata->acquisition_time & 0x3] + 695) *
(AD7280A_NUM_CH * n_avg[pdata->conversion_averaging & 0x3])) -
t_acq_ns[pdata->acquisition_time & 0x3] + st->slave_num * 250;
/* Convert to usecs */
st->readback_delay_us = DIV_ROUND_UP(st->readback_delay_us, 1000);
st->readback_delay_us += 5; /* Add tWAIT */
indio_dev->name = spi_get_device_id(spi)->name;
indio_dev->modes = INDIO_DIRECT_MODE;
ret = ad7280_channel_init(st);
if (ret < 0)
return ret;
indio_dev->num_channels = ret;
indio_dev->channels = st->channels;
indio_dev->info = &ad7280_info;
ret = ad7280_attr_init(st);
if (ret < 0)
return ret;
ret = devm_iio_device_register(&spi->dev, indio_dev);
if (ret)
return ret;
if (spi->irq > 0) {
ret = ad7280_write(st, AD7280A_DEVADDR_MASTER,
AD7280A_ALERT, 1,
AD7280A_ALERT_RELAY_SIG_CHAIN_DOWN);
if (ret)
return ret;
ret = ad7280_write(st, ad7280a_devaddr(st->slave_num),
AD7280A_ALERT, 0,
AD7280A_ALERT_GEN_STATIC_HIGH |
(pdata->chain_last_alert_ignore & 0xF));
if (ret)
return ret;
ret = devm_request_threaded_irq(&spi->dev, spi->irq,
NULL,
ad7280_event_handler,
IRQF_TRIGGER_FALLING |
IRQF_ONESHOT,
indio_dev->name,
indio_dev);
if (ret)
return ret;
}
return 0;
}
static const struct spi_device_id ad7280_id[] = {
{"ad7280a", 0},
{}
};
MODULE_DEVICE_TABLE(spi, ad7280_id);
static struct spi_driver ad7280_driver = {
.driver = {
.name = "ad7280",
},
.probe = ad7280_probe,
.id_table = ad7280_id,
};
module_spi_driver(ad7280_driver);
MODULE_AUTHOR("Michael Hennerich <michael.hennerich@analog.com>");
MODULE_DESCRIPTION("Analog Devices AD7280A");
MODULE_LICENSE("GPL v2");