diff options
Diffstat (limited to 'drivers/iio/pressure/icp10100.c')
| -rw-r--r-- | drivers/iio/pressure/icp10100.c | 658 |
1 files changed, 658 insertions, 0 deletions
diff --git a/drivers/iio/pressure/icp10100.c b/drivers/iio/pressure/icp10100.c new file mode 100644 index 000000000000..06cb5b63a189 --- /dev/null +++ b/drivers/iio/pressure/icp10100.c @@ -0,0 +1,658 @@ +// 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 */ + for (i = 0; i < 4; ++i) { + ret = icp10100_send_cmd(st, &icp10100_cmd_read_otp, + &val, sizeof(val)); + if (ret) + return ret; + st->cal[i] = be16_to_cpu(val); + dev_dbg(&st->client->dev, "cal[%d] = %d\n", i, st->cal[i]); + } + + return 0; +} + +static int icp10100_init_chip(struct icp10100_state *st) +{ + __be16 val; + uint16_t id; + int ret; + + /* read and check id */ + ret = icp10100_send_cmd(st, &icp10100_cmd_read_id, &val, sizeof(val)); + if (ret) + return ret; + id = ICP10100_ID_REG_GET(be16_to_cpu(val)); + if (id != ICP10100_ID_REG) { + dev_err(&st->client->dev, "invalid id %#x\n", id); + return -ENODEV; + } + + /* read calibration data from OTP */ + ret = icp10100_read_cal_otp(st); + if (ret) + return ret; + + /* reset chip */ + return icp10100_send_cmd(st, &icp10100_cmd_soft_reset, NULL, 0); +} + +static int icp10100_get_measures(struct icp10100_state *st, + uint32_t *pressure, uint16_t *temperature) +{ + const struct icp10100_command *cmd; + __be16 measures[3]; + int ret; + + pm_runtime_get_sync(&st->client->dev); + + mutex_lock(&st->lock); + cmd = &icp10100_cmd_measure[st->mode]; + ret = icp10100_send_cmd(st, cmd, measures, sizeof(measures)); + mutex_unlock(&st->lock); + if (ret) + goto error_measure; + + *pressure = (be16_to_cpu(measures[0]) << 8) | + (be16_to_cpu(measures[1]) >> 8); + *temperature = be16_to_cpu(measures[2]); + + pm_runtime_mark_last_busy(&st->client->dev); +error_measure: + pm_runtime_put_autosuspend(&st->client->dev); + return ret; +} + +static uint32_t icp10100_get_pressure(struct icp10100_state *st, + uint32_t raw_pressure, uint16_t raw_temp) +{ + static int32_t p_calib[] = {45000, 80000, 105000}; + static int32_t lut_lower = 3670016; + static int32_t lut_upper = 12058624; + static int32_t inv_quadr_factor = 16777216; + static int32_t offset_factor = 2048; + int64_t val1, val2; + int32_t p_lut[3]; + int32_t t, t_square; + int64_t a, b, c; + uint32_t pressure_mPa; + + dev_dbg(&st->client->dev, "raw: pressure = %u, temp = %u\n", + raw_pressure, raw_temp); + + /* compute p_lut values */ + t = (int32_t)raw_temp - 32768; + t_square = t * t; + val1 = (int64_t)st->cal[0] * (int64_t)t_square; + p_lut[0] = lut_lower + (int32_t)div_s64(val1, inv_quadr_factor); + val1 = (int64_t)st->cal[1] * (int64_t)t_square; + p_lut[1] = offset_factor * st->cal[3] + + (int32_t)div_s64(val1, inv_quadr_factor); + val1 = (int64_t)st->cal[2] * (int64_t)t_square; + p_lut[2] = lut_upper + (int32_t)div_s64(val1, inv_quadr_factor); + dev_dbg(&st->client->dev, "p_lut = [%d, %d, %d]\n", + p_lut[0], p_lut[1], p_lut[2]); + + /* compute a, b, c factors */ + val1 = (int64_t)p_lut[0] * (int64_t)p_lut[1] * + (int64_t)(p_calib[0] - p_calib[1]) + + (int64_t)p_lut[1] * (int64_t)p_lut[2] * + (int64_t)(p_calib[1] - p_calib[2]) + + (int64_t)p_lut[2] * (int64_t)p_lut[0] * + (int64_t)(p_calib[2] - p_calib[0]); + val2 = (int64_t)p_lut[2] * (int64_t)(p_calib[0] - p_calib[1]) + + (int64_t)p_lut[0] * (int64_t)(p_calib[1] - p_calib[2]) + + (int64_t)p_lut[1] * (int64_t)(p_calib[2] - p_calib[0]); + c = div64_s64(val1, val2); + dev_dbg(&st->client->dev, "val1 = %lld, val2 = %lld, c = %lld\n", + val1, val2, c); + val1 = (int64_t)p_calib[0] * (int64_t)p_lut[0] - + (int64_t)p_calib[1] * (int64_t)p_lut[1] - + (int64_t)(p_calib[1] - p_calib[0]) * c; + val2 = (int64_t)p_lut[0] - (int64_t)p_lut[1]; + a = div64_s64(val1, val2); + dev_dbg(&st->client->dev, "val1 = %lld, val2 = %lld, a = %lld\n", + val1, val2, a); + b = ((int64_t)p_calib[0] - a) * ((int64_t)p_lut[0] + c); + dev_dbg(&st->client->dev, "b = %lld\n", b); + + /* + * pressure_Pa = a + (b / (c + raw_pressure)) + * pressure_mPa = 1000 * pressure_Pa + */ + pressure_mPa = 1000LL * a + div64_s64(1000LL * b, c + raw_pressure); + + return pressure_mPa; +} + +static int icp10100_read_raw_measures(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2) +{ + struct icp10100_state *st = iio_priv(indio_dev); + uint32_t raw_pressure; + uint16_t raw_temp; + uint32_t pressure_mPa; + int ret; + + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + + ret = icp10100_get_measures(st, &raw_pressure, &raw_temp); + if (ret) + goto error_release; + + switch (chan->type) { + case IIO_PRESSURE: + pressure_mPa = icp10100_get_pressure(st, raw_pressure, + raw_temp); + /* mPa to kPa */ + *val = pressure_mPa / 1000000; + *val2 = pressure_mPa % 1000000; + ret = IIO_VAL_INT_PLUS_MICRO; + break; + case IIO_TEMP: + *val = raw_temp; + ret = IIO_VAL_INT; + break; + default: + ret = -EINVAL; + break; + } + +error_release: + iio_device_release_direct_mode(indio_dev); + return ret; +} + +static int icp10100_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct icp10100_state *st = iio_priv(indio_dev); + + switch (mask) { + case IIO_CHAN_INFO_RAW: + case IIO_CHAN_INFO_PROCESSED: + return icp10100_read_raw_measures(indio_dev, chan, val, val2); + case IIO_CHAN_INFO_SCALE: + switch (chan->type) { + case IIO_TEMP: + /* 1000 * 175°C / 65536 in m°C */ + *val = 2; + *val2 = 670288; + return IIO_VAL_INT_PLUS_MICRO; + default: + return -EINVAL; + } + break; + case IIO_CHAN_INFO_OFFSET: + switch (chan->type) { + case IIO_TEMP: + /* 1000 * -45°C in m°C */ + *val = -45000; + return IIO_VAL_INT; + default: + return -EINVAL; + } + break; + case IIO_CHAN_INFO_OVERSAMPLING_RATIO: + mutex_lock(&st->lock); + *val = 1 << st->mode; + mutex_unlock(&st->lock); + return IIO_VAL_INT; + default: + return -EINVAL; + } +} + +static int icp10100_read_avail(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int **vals, int *type, int *length, + long mask) +{ + static int oversamplings[] = {1, 2, 4, 8}; + + switch (mask) { + case IIO_CHAN_INFO_OVERSAMPLING_RATIO: + *vals = oversamplings; + *type = IIO_VAL_INT; + *length = ARRAY_SIZE(oversamplings); + return IIO_AVAIL_LIST; + default: + return -EINVAL; + } +} + +static int icp10100_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct icp10100_state *st = iio_priv(indio_dev); + unsigned int mode; + int ret; + + switch (mask) { + case IIO_CHAN_INFO_OVERSAMPLING_RATIO: + /* oversampling is always positive and a power of 2 */ + if (val <= 0 || !is_power_of_2(val)) + return -EINVAL; + mode = ilog2(val); + if (mode >= ICP10100_MODE_NB) + return -EINVAL; + ret = iio_device_claim_direct_mode(indio_dev); + if (ret) + return ret; + mutex_lock(&st->lock); + st->mode = mode; + mutex_unlock(&st->lock); + iio_device_release_direct_mode(indio_dev); + return 0; + default: + return -EINVAL; + } +} + +static int icp10100_write_raw_get_fmt(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + long mask) +{ + switch (mask) { + case IIO_CHAN_INFO_OVERSAMPLING_RATIO: + return IIO_VAL_INT; + default: + return -EINVAL; + } +} + +static const struct iio_info icp10100_info = { + .read_raw = icp10100_read_raw, + .read_avail = icp10100_read_avail, + .write_raw = icp10100_write_raw, + .write_raw_get_fmt = icp10100_write_raw_get_fmt, +}; + +static const struct iio_chan_spec icp10100_channels[] = { + { + .type = IIO_PRESSURE, + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), + .info_mask_shared_by_all = + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), + .info_mask_shared_by_all_available = + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), + }, { + .type = IIO_TEMP, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_SCALE) | + BIT(IIO_CHAN_INFO_OFFSET), + .info_mask_shared_by_all = + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), + .info_mask_shared_by_all_available = + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO), + }, +}; + +static int icp10100_enable_regulator(struct icp10100_state *st) +{ + int ret; + + ret = regulator_enable(st->vdd); + if (ret) + return ret; + msleep(100); + + return 0; +} + +static void icp10100_disable_regulator_action(void *data) +{ + struct icp10100_state *st = data; + int ret; + + ret = regulator_disable(st->vdd); + if (ret) + dev_err(&st->client->dev, "error %d disabling vdd\n", ret); +} + +static void icp10100_pm_disable(void *data) +{ + struct device *dev = data; + + pm_runtime_put_sync_suspend(dev); + pm_runtime_disable(dev); +} + +static int icp10100_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct iio_dev *indio_dev; + struct icp10100_state *st; + int ret; + + if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { + dev_err(&client->dev, "plain i2c transactions not supported\n"); + return -ENODEV; + } + + indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*st)); + if (!indio_dev) + return -ENOMEM; + + i2c_set_clientdata(client, indio_dev); + indio_dev->dev.parent = &client->dev; + indio_dev->name = client->name; + indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = icp10100_channels; + indio_dev->num_channels = ARRAY_SIZE(icp10100_channels); + indio_dev->info = &icp10100_info; + + st = iio_priv(indio_dev); + mutex_init(&st->lock); + st->client = client; + st->mode = ICP10100_MODE_N; + + st->vdd = devm_regulator_get(&client->dev, "vdd"); + if (IS_ERR(st->vdd)) + return PTR_ERR(st->vdd); + + ret = icp10100_enable_regulator(st); + if (ret) + return ret; + + ret = devm_add_action_or_reset(&client->dev, + icp10100_disable_regulator_action, st); + if (ret) + return ret; + + /* has to be done before the first i2c communication */ + crc8_populate_msb(icp10100_crc8_table, ICP10100_CRC8_POLYNOMIAL); + + ret = icp10100_init_chip(st); + if (ret) { + dev_err(&client->dev, "init chip error %d\n", ret); + return ret; + } + + /* enable runtime pm with autosuspend delay of 2s */ + pm_runtime_get_noresume(&client->dev); + pm_runtime_set_active(&client->dev); + pm_runtime_enable(&client->dev); + pm_runtime_set_autosuspend_delay(&client->dev, 2000); + pm_runtime_use_autosuspend(&client->dev); + pm_runtime_put(&client->dev); + ret = devm_add_action_or_reset(&client->dev, icp10100_pm_disable, + &client->dev); + if (ret) + return ret; + + return devm_iio_device_register(&client->dev, indio_dev); +} + +static int __maybe_unused icp10100_suspend(struct device *dev) +{ + struct icp10100_state *st = iio_priv(dev_get_drvdata(dev)); + int ret; + + mutex_lock(&st->lock); + ret = regulator_disable(st->vdd); + mutex_unlock(&st->lock); + + return ret; +} + +static int __maybe_unused icp10100_resume(struct device *dev) +{ + struct icp10100_state *st = iio_priv(dev_get_drvdata(dev)); + int ret; + + mutex_lock(&st->lock); + + ret = icp10100_enable_regulator(st); + if (ret) + goto out_unlock; + + /* reset chip */ + ret = icp10100_send_cmd(st, &icp10100_cmd_soft_reset, NULL, 0); + +out_unlock: + mutex_unlock(&st->lock); + return ret; +} + +static UNIVERSAL_DEV_PM_OPS(icp10100_pm, icp10100_suspend, icp10100_resume, + NULL); + +static const struct of_device_id icp10100_of_match[] = { + { + .compatible = "invensense,icp10100", + }, + { } +}; +MODULE_DEVICE_TABLE(of, icp10100_of_match); + +static const struct i2c_device_id icp10100_id[] = { + { "icp10100", 0 }, + { } +}; +MODULE_DEVICE_TABLE(i2c, icp10100_id); + +static struct i2c_driver icp10100_driver = { + .driver = { + .name = "icp10100", + .pm = &icp10100_pm, + .of_match_table = of_match_ptr(icp10100_of_match), + }, + .probe = icp10100_probe, + .id_table = icp10100_id, +}; +module_i2c_driver(icp10100_driver); + +MODULE_AUTHOR("InvenSense, Inc."); +MODULE_DESCRIPTION("InvenSense icp10100 driver"); +MODULE_LICENSE("GPL"); |