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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Copyright (C) 2020 InvenSense, Inc.
*
* Driver for InvenSense ICP-1010xx barometric pressure and temperature sensor.
*
* Datasheet:
* http://www.invensense.com/wp-content/uploads/2018/01/DS-000186-ICP-101xx-v1.2.pdf
*/
#include <linux/device.h>
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/pm_runtime.h>
#include <linux/crc8.h>
#include <linux/mutex.h>
#include <linux/delay.h>
#include <linux/log2.h>
#include <linux/math64.h>
#include <linux/regulator/consumer.h>
#include <linux/iio/iio.h>
#define ICP10100_ID_REG_GET(_reg) ((_reg) & 0x003F)
#define ICP10100_ID_REG 0x08
#define ICP10100_RESPONSE_WORD_LENGTH 3
#define ICP10100_CRC8_WORD_LENGTH 2
#define ICP10100_CRC8_POLYNOMIAL 0x31
#define ICP10100_CRC8_INIT 0xFF
enum icp10100_mode {
ICP10100_MODE_LP, /* Low power mode: 1x sampling */
ICP10100_MODE_N, /* Normal mode: 2x sampling */
ICP10100_MODE_LN, /* Low noise mode: 4x sampling */
ICP10100_MODE_ULN, /* Ultra low noise mode: 8x sampling */
ICP10100_MODE_NB,
};
struct icp10100_state {
struct mutex lock;
struct i2c_client *client;
struct regulator *vdd;
enum icp10100_mode mode;
int16_t cal[4];
};
struct icp10100_command {
__be16 cmd;
unsigned long wait_us;
unsigned long wait_max_us;
size_t response_word_nb;
};
static const struct icp10100_command icp10100_cmd_soft_reset = {
.cmd = cpu_to_be16(0x805D),
.wait_us = 170,
.wait_max_us = 200,
.response_word_nb = 0,
};
static const struct icp10100_command icp10100_cmd_read_id = {
.cmd = cpu_to_be16(0xEFC8),
.wait_us = 0,
.response_word_nb = 1,
};
static const struct icp10100_command icp10100_cmd_read_otp = {
.cmd = cpu_to_be16(0xC7F7),
.wait_us = 0,
.response_word_nb = 1,
};
static const struct icp10100_command icp10100_cmd_measure[] = {
[ICP10100_MODE_LP] = {
.cmd = cpu_to_be16(0x401A),
.wait_us = 1800,
.wait_max_us = 2000,
.response_word_nb = 3,
},
[ICP10100_MODE_N] = {
.cmd = cpu_to_be16(0x48A3),
.wait_us = 6300,
.wait_max_us = 6500,
.response_word_nb = 3,
},
[ICP10100_MODE_LN] = {
.cmd = cpu_to_be16(0x5059),
.wait_us = 23800,
.wait_max_us = 24000,
.response_word_nb = 3,
},
[ICP10100_MODE_ULN] = {
.cmd = cpu_to_be16(0x58E0),
.wait_us = 94500,
.wait_max_us = 94700,
.response_word_nb = 3,
},
};
static const uint8_t icp10100_switch_mode_otp[] =
{0xC5, 0x95, 0x00, 0x66, 0x9c};
DECLARE_CRC8_TABLE(icp10100_crc8_table);
static inline int icp10100_i2c_xfer(struct i2c_adapter *adap,
struct i2c_msg *msgs, int num)
{
int ret;
ret = i2c_transfer(adap, msgs, num);
if (ret < 0)
return ret;
if (ret != num)
return -EIO;
return 0;
}
static int icp10100_send_cmd(struct icp10100_state *st,
const struct icp10100_command *cmd,
__be16 *buf, size_t buf_len)
{
size_t size = cmd->response_word_nb * ICP10100_RESPONSE_WORD_LENGTH;
uint8_t data[16];
uint8_t *ptr;
uint8_t *buf_ptr = (uint8_t *)buf;
struct i2c_msg msgs[2] = {
{
.addr = st->client->addr,
.flags = 0,
.len = 2,
.buf = (uint8_t *)&cmd->cmd,
}, {
.addr = st->client->addr,
.flags = I2C_M_RD,
.len = size,
.buf = data,
},
};
uint8_t crc;
unsigned int i;
int ret;
if (size > sizeof(data))
return -EINVAL;
if (cmd->response_word_nb > 0 &&
(buf == NULL || buf_len < (cmd->response_word_nb * 2)))
return -EINVAL;
dev_dbg(&st->client->dev, "sending cmd %#x\n", be16_to_cpu(cmd->cmd));
if (cmd->response_word_nb > 0 && cmd->wait_us == 0) {
/* direct command-response without waiting */
ret = icp10100_i2c_xfer(st->client->adapter, msgs,
ARRAY_SIZE(msgs));
if (ret)
return ret;
} else {
/* transfer command write */
ret = icp10100_i2c_xfer(st->client->adapter, &msgs[0], 1);
if (ret)
return ret;
if (cmd->wait_us > 0)
usleep_range(cmd->wait_us, cmd->wait_max_us);
/* transfer response read if needed */
if (cmd->response_word_nb > 0) {
ret = icp10100_i2c_xfer(st->client->adapter, &msgs[1], 1);
if (ret)
return ret;
} else {
return 0;
}
}
/* process read words with crc checking */
for (i = 0; i < cmd->response_word_nb; ++i) {
ptr = &data[i * ICP10100_RESPONSE_WORD_LENGTH];
crc = crc8(icp10100_crc8_table, ptr, ICP10100_CRC8_WORD_LENGTH,
ICP10100_CRC8_INIT);
if (crc != ptr[ICP10100_CRC8_WORD_LENGTH]) {
dev_err(&st->client->dev, "crc error recv=%#x calc=%#x\n",
ptr[ICP10100_CRC8_WORD_LENGTH], crc);
return -EIO;
}
*buf_ptr++ = ptr[0];
*buf_ptr++ = ptr[1];
}
return 0;
}
static int icp10100_read_cal_otp(struct icp10100_state *st)
{
__be16 val;
int i;
int ret;
/* switch into OTP read mode */
ret = i2c_master_send(st->client, icp10100_switch_mode_otp,
ARRAY_SIZE(icp10100_switch_mode_otp));
if (ret < 0)
return ret;
if (ret != ARRAY_SIZE(icp10100_switch_mode_otp))
return -EIO;
/* read 4 calibration values */
|