^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0-only
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * si7005.c - Support for Silabs Si7005 humidity and temperature sensor
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * (7-bit I2C slave address 0x40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * TODO: heater, fast mode, processed mode (temp. / linearity compensation)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/i2c.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/delay.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/pm.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/iio/iio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/iio/sysfs.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #define SI7005_STATUS 0x00
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define SI7005_DATA 0x01 /* 16-bit, MSB */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define SI7005_CONFIG 0x03
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) #define SI7005_ID 0x11
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) #define SI7005_STATUS_NRDY BIT(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) #define SI7005_CONFIG_TEMP BIT(4)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) #define SI7005_CONFIG_START BIT(0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) #define SI7005_ID_7005 0x50
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #define SI7005_ID_7015 0xf0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) struct si7005_data {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) struct i2c_client *client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct mutex lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) u8 config;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) static int si7005_read_measurement(struct si7005_data *data, bool temp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) int tries = 50;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) mutex_lock(&data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) ret = i2c_smbus_write_byte_data(data->client, SI7005_CONFIG,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) data->config | SI7005_CONFIG_START |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) (temp ? SI7005_CONFIG_TEMP : 0));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) while (tries-- > 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) msleep(20);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) ret = i2c_smbus_read_byte_data(data->client, SI7005_STATUS);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) if (!(ret & SI7005_STATUS_NRDY))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (tries < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) ret = -EIO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) goto done;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) ret = i2c_smbus_read_word_swapped(data->client, SI7005_DATA);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) done:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) mutex_unlock(&data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static int si7005_read_raw(struct iio_dev *indio_dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) struct iio_chan_spec const *chan, int *val,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) int *val2, long mask)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) struct si7005_data *data = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) switch (mask) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) case IIO_CHAN_INFO_RAW:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) ret = si7005_read_measurement(data, chan->type == IIO_TEMP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) *val = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return IIO_VAL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) case IIO_CHAN_INFO_SCALE:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) if (chan->type == IIO_TEMP) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) *val = 7;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) *val2 = 812500;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) *val = 3;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) *val2 = 906250;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) return IIO_VAL_INT_PLUS_MICRO;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) case IIO_CHAN_INFO_OFFSET:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (chan->type == IIO_TEMP)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) *val = -50 * 32 * 4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) *val = -24 * 16 * 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) return IIO_VAL_INT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) default:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) static const struct iio_chan_spec si7005_channels[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) .type = IIO_HUMIDITYRELATIVE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_OFFSET),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) .type = IIO_TEMP,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INFO_OFFSET),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) static const struct iio_info si7005_info = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) .read_raw = si7005_read_raw,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) static int si7005_probe(struct i2c_client *client,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) const struct i2c_device_id *id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) struct iio_dev *indio_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) struct si7005_data *data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return -EOPNOTSUPP;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) if (!indio_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) data = iio_priv(indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) i2c_set_clientdata(client, indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) data->client = client;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) mutex_init(&data->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) indio_dev->name = dev_name(&client->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) indio_dev->modes = INDIO_DIRECT_MODE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) indio_dev->info = &si7005_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) indio_dev->channels = si7005_channels;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) indio_dev->num_channels = ARRAY_SIZE(si7005_channels);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) ret = i2c_smbus_read_byte_data(client, SI7005_ID);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) if (ret != SI7005_ID_7005 && ret != SI7005_ID_7015)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) ret = i2c_smbus_read_byte_data(client, SI7005_CONFIG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) data->config = ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) return devm_iio_device_register(&client->dev, indio_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static const struct i2c_device_id si7005_id[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) { "si7005", 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) { "th02", 0 },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) { }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) MODULE_DEVICE_TABLE(i2c, si7005_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) static struct i2c_driver si7005_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) .name = "si7005",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) .probe = si7005_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) .id_table = si7005_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) module_i2c_driver(si7005_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) MODULE_DESCRIPTION("Silabs Si7005 humidity and temperature sensor driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) MODULE_LICENSE("GPL");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags