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// SPDX-License-Identifier: GPL-2.0
/*
* All Sensors DLH series low voltage digital pressure sensors
*
* Copyright (c) 2019 AVL DiTEST GmbH
* Tomislav Denis <tomislav.denis@avl.com>
*
* Datasheet: http://www.allsensors.com/cad/DS-0355_Rev_B.PDF
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <asm/unaligned.h>
/* Commands */
#define DLH_START_SINGLE 0xAA
/* Status bits */
#define DLH_STATUS_OK 0x40
/* DLH data format */
#define DLH_NUM_READ_BYTES 7
#define DLH_NUM_DATA_BYTES 3
#define DLH_NUM_PR_BITS 24
#define DLH_NUM_TEMP_BITS 24
/* DLH timings */
#define DLH_SINGLE_DUT_MS 5
enum dhl_ids {
dlhl60d,
dlhl60g,
};
struct dlh_info {
u8 osdig; /* digital offset factor */
unsigned int fss; /* full scale span (inch H2O) */
};
struct dlh_state {
struct i2c_client *client;
struct dlh_info info;
bool use_interrupt;
struct completion completion;
u8 rx_buf[DLH_NUM_READ_BYTES] ____cacheline_aligned;
};
static struct dlh_info dlh_info_tbl[] = {
[dlhl60d] = {
.osdig = 2,
.fss = 120,
},
[dlhl60g] = {
.osdig = 10,
.fss = 60,
},
};
static int dlh_cmd_start_single(struct dlh_state *st)
{
int ret;
ret = i2c_smbus_write_byte(st->client, DLH_START_SINGLE);
if (ret)
dev_err(&st->client->dev,
"%s: I2C write byte failed\n", __func__);
return ret;
}
static int dlh_cmd_read_data(struct dlh_state *st)
{
int ret;
ret = i2c_master_recv(st->client, st->rx_buf, DLH_NUM_READ_BYTES);
if (ret < 0) {
dev_err(&st->client->dev,
"%s: I2C read block failed\n", __func__);
return ret;
}
if (st->rx_buf[0] != DLH_STATUS_OK) {
dev_err(&st->client->dev,
"%s: invalid status 0x%02x\n", __func__, st->rx_buf[0]);
return -EBUSY;
}
return 0;
}
static int dlh_start_capture_and_read(struct dlh_state *st)
{
int ret;
if (st->use_interrupt)
reinit_completion(&st->completion);
ret = dlh_cmd_start_single(st);
if (ret)
return ret;
if (st->use_interrupt) {
ret = wait_for_completion_timeout(&st->completion,
msecs_to_jiffies(DLH_SINGLE_DUT_MS));
if (!ret) {
dev_err(&st->client->dev,
"%s: conversion timed out\n", __func__);
return -ETIMEDOUT;
}
} else {
mdelay(DLH_SINGLE_DUT_MS);
}
return dlh_cmd_read_data(st);
}
static int dlh_read_direct(struct dlh_state *st,
unsigned int *pressure, unsigned int *temperature)
{
int ret;
ret = dlh_start_capture_and_read(st);
if (ret)
return ret;
*pressure = get_unaligned_be32(&st->rx_buf[1]) >> 8;
*temperature = get_unaligned_be32(&st->rx_buf[3]) &
GENMASK(DLH_NUM_TEMP_BITS - 1, 0);
return 0;
}
static int dlh_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *channel, int *value,
int *value2, long mask)
{
struct dlh_state *st = iio_priv(indio_dev);
unsigned int pressure, temperature;
int ret;
s64 tmp;
s32 rem;
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = iio_device_claim_direct_mode(indio_dev);
if (ret)
return ret;
ret = dlh_read_direct(st, &pressure, &temperature);
iio_device_release_direct_mode(indio_dev);
if (ret)
return ret;
switch (channel->type) {
case IIO_PRESSURE:
*value = pressure;
return IIO_VAL_INT;
case IIO_TEMP:
*value = temperature;
return IIO_VAL_INT;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_SCALE:
switch (channel->type) {
case IIO_PRESSURE:
tmp = div_s64(125LL * st->info.fss * 24909 * 100,
1 << DLH_NUM_PR_BITS);
tmp = div_s64_rem(tmp, 1000000000LL, &rem);
*value = tmp;
*value2 = rem;
return IIO_VAL_INT_PLUS_NANO;
case IIO_TEMP:
*value = 125 * 1000;
*value2 = DLH_NUM_TEMP_BITS;
return IIO_VAL_FRACTIONAL_LOG2;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_OFFSET:
switch (channel->type) {
case IIO_PRESSURE:
*value = -125 * st->info.fss * 24909;
*value2 = 100 * st->info.osdig * 100000;
return IIO_VAL_FRACTIONAL;
case IIO_TEMP:
*value = -40 * 1000;
return IIO_VAL_INT;
default:
return -EINVAL;
}
}
return -EINVAL;
}
static const struct iio_info dlh_info = {
.read_raw = dlh_read_raw,
};
static const struct iio_chan_spec dlh_channels[] = {
{
.type = IIO_PRESSURE,
.indexed = 1,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_type =
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_OFFSET),
.scan_index = 0,
.scan_type = {
.sign = 'u',
.realbits = DLH_NUM_PR_BITS,
.storagebits = 32,
.shift = 8,
.endianness = IIO_BE,
},
}, {
.type = IIO_TEMP,
.indexed = 1,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_type =
BIT(IIO_CHAN_INFO_SCALE) |
BIT(IIO_CHAN_INFO_OFFSET),
.scan_index = 1,
.scan_type = {
.sign = 'u',
.realbits = DLH_NUM_TEMP_BITS,
.storagebits = 32,
.shift = 8,
.endianness = IIO_BE,
},
}
};
static irqreturn_t dlh_trigger_handler(int irq, void *private)
{
struct iio_poll_func *pf = private;
struct iio_dev *indio_dev = pf->indio_dev;
struct dlh_state *st = iio_priv(indio_dev);
int ret;
unsigned int chn, i = 0;
__be32 tmp_buf[2];
ret = dlh_start_capture_and_read(st);
if (ret)
goto out;
for_each_set_bit(chn, indio_dev->active_scan_mask,
indio_dev->masklength) {
memcpy(tmp_buf + i,
&st->rx_buf[1] + chn * DLH_NUM_DATA_BYTES,
DLH_NUM_DATA_BYTES);
i++;
}
iio_push_to_buffers(indio_dev, tmp_buf);
out:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static irqreturn_t dlh_interrupt(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct dlh_state *st = iio_priv(indio_dev);
complete(&st->completion);
return IRQ_HANDLED;
};
static int dlh_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct dlh_state *st;
struct iio_dev *indio_dev;
int ret;
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_I2C | I2C_FUNC_SMBUS_WRITE_BYTE)) {
dev_err(&client->dev,
"adapter doesn't support required i2c functionality\n");
return -EOPNOTSUPP;
}
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