136edc939SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 2e5a63942SPeter Meerwald /* 3e5a63942SPeter Meerwald * tmp006.c - Support for TI TMP006 IR thermopile sensor 4e5a63942SPeter Meerwald * 5e5a63942SPeter Meerwald * Copyright (c) 2013 Peter Meerwald <pmeerw@pmeerw.net> 6e5a63942SPeter Meerwald * 7e5a63942SPeter Meerwald * Driver for the Texas Instruments I2C 16-bit IR thermopile sensor 8e5a63942SPeter Meerwald * 9e5a63942SPeter Meerwald * (7-bit I2C slave address 0x40, changeable via ADR pins) 10e5a63942SPeter Meerwald * 11e5a63942SPeter Meerwald * TODO: data ready irq 12e5a63942SPeter Meerwald */ 13e5a63942SPeter Meerwald 14e5a63942SPeter Meerwald #include <linux/err.h> 15e5a63942SPeter Meerwald #include <linux/i2c.h> 16e5a63942SPeter Meerwald #include <linux/delay.h> 17e5a63942SPeter Meerwald #include <linux/module.h> 18e5a63942SPeter Meerwald #include <linux/pm.h> 19e5a63942SPeter Meerwald #include <linux/bitops.h> 20e5a63942SPeter Meerwald 21e5a63942SPeter Meerwald #include <linux/iio/iio.h> 22e5a63942SPeter Meerwald #include <linux/iio/sysfs.h> 23e5a63942SPeter Meerwald 24e5a63942SPeter Meerwald #define TMP006_VOBJECT 0x00 25e5a63942SPeter Meerwald #define TMP006_TAMBIENT 0x01 26e5a63942SPeter Meerwald #define TMP006_CONFIG 0x02 27e5a63942SPeter Meerwald #define TMP006_MANUFACTURER_ID 0xfe 28e5a63942SPeter Meerwald #define TMP006_DEVICE_ID 0xff 29e5a63942SPeter Meerwald 30e5a63942SPeter Meerwald #define TMP006_TAMBIENT_SHIFT 2 31e5a63942SPeter Meerwald 32e5a63942SPeter Meerwald #define TMP006_CONFIG_RESET BIT(15) 33e5a63942SPeter Meerwald #define TMP006_CONFIG_DRDY_EN BIT(8) 34e5a63942SPeter Meerwald #define TMP006_CONFIG_DRDY BIT(7) 35e5a63942SPeter Meerwald 3657f7d509SPeter Meerwald #define TMP006_CONFIG_MOD_MASK GENMASK(14, 12) 37e5a63942SPeter Meerwald 3857f7d509SPeter Meerwald #define TMP006_CONFIG_CR_MASK GENMASK(11, 9) 39e5a63942SPeter Meerwald #define TMP006_CONFIG_CR_SHIFT 9 40e5a63942SPeter Meerwald 4149064b5aSPeter Meerwald #define TMP006_MANUFACTURER_MAGIC 0x5449 4249064b5aSPeter Meerwald #define TMP006_DEVICE_MAGIC 0x0067 43e5a63942SPeter Meerwald 44e5a63942SPeter Meerwald struct tmp006_data { 45e5a63942SPeter Meerwald struct i2c_client *client; 46e5a63942SPeter Meerwald u16 config; 47e5a63942SPeter Meerwald }; 48e5a63942SPeter Meerwald 49e5a63942SPeter Meerwald static int tmp006_read_measurement(struct tmp006_data *data, u8 reg) 50e5a63942SPeter Meerwald { 51e5a63942SPeter Meerwald s32 ret; 52e5a63942SPeter Meerwald int tries = 50; 53e5a63942SPeter Meerwald 54e5a63942SPeter Meerwald while (tries-- > 0) { 55e5a63942SPeter Meerwald ret = i2c_smbus_read_word_swapped(data->client, 56e5a63942SPeter Meerwald TMP006_CONFIG); 57e5a63942SPeter Meerwald if (ret < 0) 58e5a63942SPeter Meerwald return ret; 59e5a63942SPeter Meerwald if (ret & TMP006_CONFIG_DRDY) 60e5a63942SPeter Meerwald break; 61e5a63942SPeter Meerwald msleep(100); 62e5a63942SPeter Meerwald } 63e5a63942SPeter Meerwald 64e5a63942SPeter Meerwald if (tries < 0) 65e5a63942SPeter Meerwald return -EIO; 66e5a63942SPeter Meerwald 67e5a63942SPeter Meerwald return i2c_smbus_read_word_swapped(data->client, reg); 68e5a63942SPeter Meerwald } 69e5a63942SPeter Meerwald 70da1690e6SJonathan Cameron static const int tmp006_freqs[5][2] = { {4, 0}, {2, 0}, {1, 0}, 71da1690e6SJonathan Cameron {0, 500000}, {0, 250000} }; 72da1690e6SJonathan Cameron 73e5a63942SPeter Meerwald static int tmp006_read_raw(struct iio_dev *indio_dev, 74e5a63942SPeter Meerwald struct iio_chan_spec const *channel, int *val, 75e5a63942SPeter Meerwald int *val2, long mask) 76e5a63942SPeter Meerwald { 77e5a63942SPeter Meerwald struct tmp006_data *data = iio_priv(indio_dev); 78e5a63942SPeter Meerwald s32 ret; 79da1690e6SJonathan Cameron int cr; 80e5a63942SPeter Meerwald 81e5a63942SPeter Meerwald switch (mask) { 82e5a63942SPeter Meerwald case IIO_CHAN_INFO_RAW: 83e5a63942SPeter Meerwald if (channel->type == IIO_VOLTAGE) { 84e5a63942SPeter Meerwald /* LSB is 156.25 nV */ 85e5a63942SPeter Meerwald ret = tmp006_read_measurement(data, TMP006_VOBJECT); 86e5a63942SPeter Meerwald if (ret < 0) 87e5a63942SPeter Meerwald return ret; 88e5a63942SPeter Meerwald *val = sign_extend32(ret, 15); 89e5a63942SPeter Meerwald } else if (channel->type == IIO_TEMP) { 90e5a63942SPeter Meerwald /* LSB is 0.03125 degrees Celsius */ 91e5a63942SPeter Meerwald ret = tmp006_read_measurement(data, TMP006_TAMBIENT); 92e5a63942SPeter Meerwald if (ret < 0) 93e5a63942SPeter Meerwald return ret; 94e5a63942SPeter Meerwald *val = sign_extend32(ret, 15) >> TMP006_TAMBIENT_SHIFT; 95e5a63942SPeter Meerwald } else { 96e5a63942SPeter Meerwald break; 97e5a63942SPeter Meerwald } 98e5a63942SPeter Meerwald return IIO_VAL_INT; 99e5a63942SPeter Meerwald case IIO_CHAN_INFO_SCALE: 100e5a63942SPeter Meerwald if (channel->type == IIO_VOLTAGE) { 101e5a63942SPeter Meerwald *val = 0; 102e5a63942SPeter Meerwald *val2 = 156250; 103e5a63942SPeter Meerwald } else if (channel->type == IIO_TEMP) { 104e5a63942SPeter Meerwald *val = 31; 105e5a63942SPeter Meerwald *val2 = 250000; 106e5a63942SPeter Meerwald } else { 107e5a63942SPeter Meerwald break; 108e5a63942SPeter Meerwald } 109e5a63942SPeter Meerwald return IIO_VAL_INT_PLUS_MICRO; 110da1690e6SJonathan Cameron case IIO_CHAN_INFO_SAMP_FREQ: 111da1690e6SJonathan Cameron cr = (data->config & TMP006_CONFIG_CR_MASK) 112da1690e6SJonathan Cameron >> TMP006_CONFIG_CR_SHIFT; 113da1690e6SJonathan Cameron *val = tmp006_freqs[cr][0]; 114da1690e6SJonathan Cameron *val2 = tmp006_freqs[cr][1]; 115da1690e6SJonathan Cameron return IIO_VAL_INT_PLUS_MICRO; 116e5a63942SPeter Meerwald default: 117e5a63942SPeter Meerwald break; 118e5a63942SPeter Meerwald } 119e5a63942SPeter Meerwald 120e5a63942SPeter Meerwald return -EINVAL; 121e5a63942SPeter Meerwald } 122e5a63942SPeter Meerwald 123da1690e6SJonathan Cameron static int tmp006_write_raw(struct iio_dev *indio_dev, 124da1690e6SJonathan Cameron struct iio_chan_spec const *chan, 125da1690e6SJonathan Cameron int val, 126da1690e6SJonathan Cameron int val2, 127da1690e6SJonathan Cameron long mask) 128e5a63942SPeter Meerwald { 129e5a63942SPeter Meerwald struct tmp006_data *data = iio_priv(indio_dev); 130e5a63942SPeter Meerwald int i; 131e5a63942SPeter Meerwald 1328d05abfaSPeter Meerwald if (mask != IIO_CHAN_INFO_SAMP_FREQ) 1338d05abfaSPeter Meerwald return -EINVAL; 1348d05abfaSPeter Meerwald 135e5a63942SPeter Meerwald for (i = 0; i < ARRAY_SIZE(tmp006_freqs); i++) 136da1690e6SJonathan Cameron if ((val == tmp006_freqs[i][0]) && 137da1690e6SJonathan Cameron (val2 == tmp006_freqs[i][1])) { 138e5a63942SPeter Meerwald data->config &= ~TMP006_CONFIG_CR_MASK; 139e5a63942SPeter Meerwald data->config |= i << TMP006_CONFIG_CR_SHIFT; 140e5a63942SPeter Meerwald 141da1690e6SJonathan Cameron return i2c_smbus_write_word_swapped(data->client, 142da1690e6SJonathan Cameron TMP006_CONFIG, 143e5a63942SPeter Meerwald data->config); 144e5a63942SPeter Meerwald 145da1690e6SJonathan Cameron } 146da1690e6SJonathan Cameron return -EINVAL; 147da1690e6SJonathan Cameron } 148e5a63942SPeter Meerwald 149e5a63942SPeter Meerwald static IIO_CONST_ATTR(sampling_frequency_available, "4 2 1 0.5 0.25"); 150e5a63942SPeter Meerwald 151e5a63942SPeter Meerwald static struct attribute *tmp006_attributes[] = { 152e5a63942SPeter Meerwald &iio_const_attr_sampling_frequency_available.dev_attr.attr, 153e5a63942SPeter Meerwald NULL 154e5a63942SPeter Meerwald }; 155e5a63942SPeter Meerwald 156e5a63942SPeter Meerwald static const struct attribute_group tmp006_attribute_group = { 157e5a63942SPeter Meerwald .attrs = tmp006_attributes, 158e5a63942SPeter Meerwald }; 159e5a63942SPeter Meerwald 160e5a63942SPeter Meerwald static const struct iio_chan_spec tmp006_channels[] = { 161e5a63942SPeter Meerwald { 162e5a63942SPeter Meerwald .type = IIO_VOLTAGE, 163e5a63942SPeter Meerwald .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 164e5a63942SPeter Meerwald BIT(IIO_CHAN_INFO_SCALE), 165da1690e6SJonathan Cameron .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), 166e5a63942SPeter Meerwald }, 167e5a63942SPeter Meerwald { 168e5a63942SPeter Meerwald .type = IIO_TEMP, 169e5a63942SPeter Meerwald .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | 170e5a63942SPeter Meerwald BIT(IIO_CHAN_INFO_SCALE), 171da1690e6SJonathan Cameron .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), 172e5a63942SPeter Meerwald } 173e5a63942SPeter Meerwald }; 174e5a63942SPeter Meerwald 175e5a63942SPeter Meerwald static const struct iio_info tmp006_info = { 176e5a63942SPeter Meerwald .read_raw = tmp006_read_raw, 177da1690e6SJonathan Cameron .write_raw = tmp006_write_raw, 178e5a63942SPeter Meerwald .attrs = &tmp006_attribute_group, 179e5a63942SPeter Meerwald }; 180e5a63942SPeter Meerwald 181e5a63942SPeter Meerwald static bool tmp006_check_identification(struct i2c_client *client) 182e5a63942SPeter Meerwald { 183e5a63942SPeter Meerwald int mid, did; 184e5a63942SPeter Meerwald 185e5a63942SPeter Meerwald mid = i2c_smbus_read_word_swapped(client, TMP006_MANUFACTURER_ID); 186e5a63942SPeter Meerwald if (mid < 0) 187e5a63942SPeter Meerwald return false; 188e5a63942SPeter Meerwald 189e5a63942SPeter Meerwald did = i2c_smbus_read_word_swapped(client, TMP006_DEVICE_ID); 190e5a63942SPeter Meerwald if (did < 0) 191e5a63942SPeter Meerwald return false; 192e5a63942SPeter Meerwald 19349064b5aSPeter Meerwald return mid == TMP006_MANUFACTURER_MAGIC && did == TMP006_DEVICE_MAGIC; 194e5a63942SPeter Meerwald } 195e5a63942SPeter Meerwald 196*2bb3b8f6SAlexandru Ardelean static int tmp006_powerdown(struct tmp006_data *data) 197*2bb3b8f6SAlexandru Ardelean { 198*2bb3b8f6SAlexandru Ardelean return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG, 199*2bb3b8f6SAlexandru Ardelean data->config & ~TMP006_CONFIG_MOD_MASK); 200*2bb3b8f6SAlexandru Ardelean } 201*2bb3b8f6SAlexandru Ardelean 202*2bb3b8f6SAlexandru Ardelean static void tmp006_powerdown_cleanup(void *data) 203*2bb3b8f6SAlexandru Ardelean { 204*2bb3b8f6SAlexandru Ardelean tmp006_powerdown(data); 205*2bb3b8f6SAlexandru Ardelean } 206*2bb3b8f6SAlexandru Ardelean 207e5a63942SPeter Meerwald static int tmp006_probe(struct i2c_client *client, 208e5a63942SPeter Meerwald const struct i2c_device_id *id) 209e5a63942SPeter Meerwald { 210e5a63942SPeter Meerwald struct iio_dev *indio_dev; 211e5a63942SPeter Meerwald struct tmp006_data *data; 212e5a63942SPeter Meerwald int ret; 213e5a63942SPeter Meerwald 214e5a63942SPeter Meerwald if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA)) 215f8d9d3b4SMatt Ranostay return -EOPNOTSUPP; 216e5a63942SPeter Meerwald 217e5a63942SPeter Meerwald if (!tmp006_check_identification(client)) { 218e5a63942SPeter Meerwald dev_err(&client->dev, "no TMP006 sensor\n"); 219e5a63942SPeter Meerwald return -ENODEV; 220e5a63942SPeter Meerwald } 221e5a63942SPeter Meerwald 222e5a63942SPeter Meerwald indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data)); 223e5a63942SPeter Meerwald if (!indio_dev) 224e5a63942SPeter Meerwald return -ENOMEM; 225e5a63942SPeter Meerwald 226e5a63942SPeter Meerwald data = iio_priv(indio_dev); 227e5a63942SPeter Meerwald i2c_set_clientdata(client, indio_dev); 228e5a63942SPeter Meerwald data->client = client; 229e5a63942SPeter Meerwald 230e5a63942SPeter Meerwald indio_dev->name = dev_name(&client->dev); 231e5a63942SPeter Meerwald indio_dev->modes = INDIO_DIRECT_MODE; 232e5a63942SPeter Meerwald indio_dev->info = &tmp006_info; 233e5a63942SPeter Meerwald 234e5a63942SPeter Meerwald indio_dev->channels = tmp006_channels; 235e5a63942SPeter Meerwald indio_dev->num_channels = ARRAY_SIZE(tmp006_channels); 236e5a63942SPeter Meerwald 237e5a63942SPeter Meerwald ret = i2c_smbus_read_word_swapped(data->client, TMP006_CONFIG); 238e5a63942SPeter Meerwald if (ret < 0) 239e5a63942SPeter Meerwald return ret; 240e5a63942SPeter Meerwald data->config = ret; 241e5a63942SPeter Meerwald 242*2bb3b8f6SAlexandru Ardelean ret = devm_add_action(&client->dev, tmp006_powerdown_cleanup, data); 243*2bb3b8f6SAlexandru Ardelean if (ret < 0) 244*2bb3b8f6SAlexandru Ardelean return ret; 245e5a63942SPeter Meerwald 246*2bb3b8f6SAlexandru Ardelean return devm_iio_device_register(&client->dev, indio_dev); 247e5a63942SPeter Meerwald } 248e5a63942SPeter Meerwald 249e5a63942SPeter Meerwald #ifdef CONFIG_PM_SLEEP 250e5a63942SPeter Meerwald static int tmp006_suspend(struct device *dev) 251e5a63942SPeter Meerwald { 252d320f1b4SPeter Meerwald struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev)); 253d320f1b4SPeter Meerwald return tmp006_powerdown(iio_priv(indio_dev)); 254e5a63942SPeter Meerwald } 255e5a63942SPeter Meerwald 256e5a63942SPeter Meerwald static int tmp006_resume(struct device *dev) 257e5a63942SPeter Meerwald { 258d320f1b4SPeter Meerwald struct tmp006_data *data = iio_priv(i2c_get_clientdata( 259d320f1b4SPeter Meerwald to_i2c_client(dev))); 260e5a63942SPeter Meerwald return i2c_smbus_write_word_swapped(data->client, TMP006_CONFIG, 261e5a63942SPeter Meerwald data->config | TMP006_CONFIG_MOD_MASK); 262e5a63942SPeter Meerwald } 263e5a63942SPeter Meerwald #endif 264e5a63942SPeter Meerwald 265e5a63942SPeter Meerwald static SIMPLE_DEV_PM_OPS(tmp006_pm_ops, tmp006_suspend, tmp006_resume); 266e5a63942SPeter Meerwald 267e5a63942SPeter Meerwald static const struct i2c_device_id tmp006_id[] = { 268e5a63942SPeter Meerwald { "tmp006", 0 }, 269e5a63942SPeter Meerwald { } 270e5a63942SPeter Meerwald }; 271e5a63942SPeter Meerwald MODULE_DEVICE_TABLE(i2c, tmp006_id); 272e5a63942SPeter Meerwald 273e5a63942SPeter Meerwald static struct i2c_driver tmp006_driver = { 274e5a63942SPeter Meerwald .driver = { 275e5a63942SPeter Meerwald .name = "tmp006", 276e5a63942SPeter Meerwald .pm = &tmp006_pm_ops, 277e5a63942SPeter Meerwald }, 278e5a63942SPeter Meerwald .probe = tmp006_probe, 279e5a63942SPeter Meerwald .id_table = tmp006_id, 280e5a63942SPeter Meerwald }; 281e5a63942SPeter Meerwald module_i2c_driver(tmp006_driver); 282e5a63942SPeter Meerwald 283e5a63942SPeter Meerwald MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>"); 284e5a63942SPeter Meerwald MODULE_DESCRIPTION("TI TMP006 IR thermopile sensor driver"); 285e5a63942SPeter Meerwald MODULE_LICENSE("GPL"); 286