585 lines
14 KiB
C
585 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* tmp007.c - Support for TI TMP007 IR thermopile sensor with integrated math engine
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*
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* Copyright (c) 2017 Manivannan Sadhasivam <manivannanece23@gmail.com>
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*
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* Driver for the Texas Instruments I2C 16-bit IR thermopile sensor
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*
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* (7-bit I2C slave address (0x40 - 0x47), changeable via ADR pins)
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*
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* Note:
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* 1. This driver assumes that the sensor has been calibrated beforehand
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* 2. Limit threshold events are enabled at the start
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* 3. Operating mode: INT
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*/
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#include <linux/err.h>
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#include <linux/i2c.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/pm.h>
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#include <linux/bitops.h>
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#include <linux/mod_devicetable.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/events.h>
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#define TMP007_TDIE 0x01
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#define TMP007_CONFIG 0x02
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#define TMP007_TOBJECT 0x03
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#define TMP007_STATUS 0x04
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#define TMP007_STATUS_MASK 0x05
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#define TMP007_TOBJ_HIGH_LIMIT 0x06
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#define TMP007_TOBJ_LOW_LIMIT 0x07
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#define TMP007_TDIE_HIGH_LIMIT 0x08
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#define TMP007_TDIE_LOW_LIMIT 0x09
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#define TMP007_MANUFACTURER_ID 0x1e
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#define TMP007_DEVICE_ID 0x1f
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#define TMP007_CONFIG_CONV_EN BIT(12)
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#define TMP007_CONFIG_TC_EN BIT(6)
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#define TMP007_CONFIG_CR_MASK GENMASK(11, 9)
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#define TMP007_CONFIG_ALERT_EN BIT(8)
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#define TMP007_CONFIG_CR_SHIFT 9
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/* Status register flags */
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#define TMP007_STATUS_ALERT BIT(15)
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#define TMP007_STATUS_CONV_READY BIT(14)
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#define TMP007_STATUS_OHF BIT(13)
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#define TMP007_STATUS_OLF BIT(12)
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#define TMP007_STATUS_LHF BIT(11)
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#define TMP007_STATUS_LLF BIT(10)
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#define TMP007_STATUS_DATA_VALID BIT(9)
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#define TMP007_MANUFACTURER_MAGIC 0x5449
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#define TMP007_DEVICE_MAGIC 0x0078
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#define TMP007_TEMP_SHIFT 2
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struct tmp007_data {
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struct i2c_client *client;
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struct mutex lock;
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u16 config;
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u16 status_mask;
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};
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static const int tmp007_avgs[5][2] = { {4, 0}, {2, 0}, {1, 0},
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{0, 500000}, {0, 250000} };
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static int tmp007_read_temperature(struct tmp007_data *data, u8 reg)
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{
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s32 ret;
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int tries = 50;
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while (tries-- > 0) {
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ret = i2c_smbus_read_word_swapped(data->client,
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TMP007_STATUS);
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if (ret < 0)
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return ret;
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if ((ret & TMP007_STATUS_CONV_READY) &&
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!(ret & TMP007_STATUS_DATA_VALID))
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break;
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msleep(100);
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}
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if (tries < 0)
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return -EIO;
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return i2c_smbus_read_word_swapped(data->client, reg);
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}
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static int tmp007_powerdown(struct tmp007_data *data)
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{
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return i2c_smbus_write_word_swapped(data->client, TMP007_CONFIG,
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data->config & ~TMP007_CONFIG_CONV_EN);
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}
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static int tmp007_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *channel, int *val,
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int *val2, long mask)
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{
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struct tmp007_data *data = iio_priv(indio_dev);
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s32 ret;
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int conv_rate;
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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switch (channel->channel2) {
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case IIO_MOD_TEMP_AMBIENT: /* LSB: 0.03125 degree Celsius */
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ret = i2c_smbus_read_word_swapped(data->client, TMP007_TDIE);
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if (ret < 0)
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return ret;
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break;
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case IIO_MOD_TEMP_OBJECT:
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ret = tmp007_read_temperature(data, TMP007_TOBJECT);
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if (ret < 0)
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return ret;
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break;
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default:
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return -EINVAL;
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}
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*val = sign_extend32(ret, 15) >> TMP007_TEMP_SHIFT;
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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*val = 31;
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*val2 = 250000;
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_CHAN_INFO_SAMP_FREQ:
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conv_rate = (data->config & TMP007_CONFIG_CR_MASK)
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>> TMP007_CONFIG_CR_SHIFT;
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*val = tmp007_avgs[conv_rate][0];
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*val2 = tmp007_avgs[conv_rate][1];
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return IIO_VAL_INT_PLUS_MICRO;
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default:
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return -EINVAL;
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}
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}
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static int tmp007_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *channel, int val,
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int val2, long mask)
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{
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struct tmp007_data *data = iio_priv(indio_dev);
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int i;
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u16 tmp;
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if (mask == IIO_CHAN_INFO_SAMP_FREQ) {
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for (i = 0; i < ARRAY_SIZE(tmp007_avgs); i++) {
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if ((val == tmp007_avgs[i][0]) &&
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(val2 == tmp007_avgs[i][1])) {
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tmp = data->config & ~TMP007_CONFIG_CR_MASK;
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tmp |= (i << TMP007_CONFIG_CR_SHIFT);
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return i2c_smbus_write_word_swapped(data->client,
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TMP007_CONFIG,
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data->config = tmp);
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}
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}
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}
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return -EINVAL;
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}
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static irqreturn_t tmp007_interrupt_handler(int irq, void *private)
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{
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struct iio_dev *indio_dev = private;
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struct tmp007_data *data = iio_priv(indio_dev);
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int ret;
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ret = i2c_smbus_read_word_swapped(data->client, TMP007_STATUS);
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if ((ret < 0) || !(ret & (TMP007_STATUS_OHF | TMP007_STATUS_OLF |
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TMP007_STATUS_LHF | TMP007_STATUS_LLF)))
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return IRQ_NONE;
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if (ret & TMP007_STATUS_OHF)
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iio_push_event(indio_dev,
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IIO_MOD_EVENT_CODE(IIO_TEMP, 0,
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IIO_MOD_TEMP_OBJECT,
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IIO_EV_TYPE_THRESH,
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IIO_EV_DIR_RISING),
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iio_get_time_ns(indio_dev));
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if (ret & TMP007_STATUS_OLF)
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iio_push_event(indio_dev,
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IIO_MOD_EVENT_CODE(IIO_TEMP, 0,
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IIO_MOD_TEMP_OBJECT,
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IIO_EV_TYPE_THRESH,
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IIO_EV_DIR_FALLING),
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iio_get_time_ns(indio_dev));
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if (ret & TMP007_STATUS_LHF)
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iio_push_event(indio_dev,
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IIO_MOD_EVENT_CODE(IIO_TEMP, 0,
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IIO_MOD_TEMP_AMBIENT,
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IIO_EV_TYPE_THRESH,
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IIO_EV_DIR_RISING),
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iio_get_time_ns(indio_dev));
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if (ret & TMP007_STATUS_LLF)
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iio_push_event(indio_dev,
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IIO_MOD_EVENT_CODE(IIO_TEMP, 0,
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IIO_MOD_TEMP_AMBIENT,
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IIO_EV_TYPE_THRESH,
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IIO_EV_DIR_FALLING),
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iio_get_time_ns(indio_dev));
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return IRQ_HANDLED;
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}
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static int tmp007_write_event_config(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan, enum iio_event_type type,
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enum iio_event_direction dir, int state)
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{
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struct tmp007_data *data = iio_priv(indio_dev);
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unsigned int status_mask;
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int ret;
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switch (chan->channel2) {
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case IIO_MOD_TEMP_AMBIENT:
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if (dir == IIO_EV_DIR_RISING)
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status_mask = TMP007_STATUS_LHF;
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else
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status_mask = TMP007_STATUS_LLF;
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break;
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case IIO_MOD_TEMP_OBJECT:
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if (dir == IIO_EV_DIR_RISING)
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status_mask = TMP007_STATUS_OHF;
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else
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status_mask = TMP007_STATUS_OLF;
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break;
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default:
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return -EINVAL;
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}
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mutex_lock(&data->lock);
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ret = i2c_smbus_read_word_swapped(data->client, TMP007_STATUS_MASK);
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mutex_unlock(&data->lock);
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if (ret < 0)
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return ret;
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if (state)
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ret |= status_mask;
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else
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ret &= ~status_mask;
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return i2c_smbus_write_word_swapped(data->client, TMP007_STATUS_MASK,
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data->status_mask = ret);
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}
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static int tmp007_read_event_config(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan, enum iio_event_type type,
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enum iio_event_direction dir)
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{
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struct tmp007_data *data = iio_priv(indio_dev);
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unsigned int mask;
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switch (chan->channel2) {
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case IIO_MOD_TEMP_AMBIENT:
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if (dir == IIO_EV_DIR_RISING)
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mask = TMP007_STATUS_LHF;
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else
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mask = TMP007_STATUS_LLF;
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break;
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case IIO_MOD_TEMP_OBJECT:
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if (dir == IIO_EV_DIR_RISING)
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mask = TMP007_STATUS_OHF;
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else
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mask = TMP007_STATUS_OLF;
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break;
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default:
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return -EINVAL;
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}
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return !!(data->status_mask & mask);
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}
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static int tmp007_read_thresh(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan, enum iio_event_type type,
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enum iio_event_direction dir, enum iio_event_info info,
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int *val, int *val2)
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{
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struct tmp007_data *data = iio_priv(indio_dev);
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int ret;
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u8 reg;
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switch (chan->channel2) {
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case IIO_MOD_TEMP_AMBIENT: /* LSB: 0.5 degree Celsius */
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if (dir == IIO_EV_DIR_RISING)
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reg = TMP007_TDIE_HIGH_LIMIT;
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else
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reg = TMP007_TDIE_LOW_LIMIT;
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break;
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case IIO_MOD_TEMP_OBJECT:
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if (dir == IIO_EV_DIR_RISING)
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reg = TMP007_TOBJ_HIGH_LIMIT;
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else
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reg = TMP007_TOBJ_LOW_LIMIT;
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break;
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default:
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return -EINVAL;
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}
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ret = i2c_smbus_read_word_swapped(data->client, reg);
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if (ret < 0)
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return ret;
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/* Shift length 7 bits = 6(15:6) + 1(0.5 LSB) */
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*val = sign_extend32(ret, 15) >> 7;
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return IIO_VAL_INT;
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}
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static int tmp007_write_thresh(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan, enum iio_event_type type,
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enum iio_event_direction dir, enum iio_event_info info,
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int val, int val2)
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{
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struct tmp007_data *data = iio_priv(indio_dev);
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u8 reg;
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switch (chan->channel2) {
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case IIO_MOD_TEMP_AMBIENT:
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if (dir == IIO_EV_DIR_RISING)
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reg = TMP007_TDIE_HIGH_LIMIT;
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else
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reg = TMP007_TDIE_LOW_LIMIT;
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break;
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case IIO_MOD_TEMP_OBJECT:
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if (dir == IIO_EV_DIR_RISING)
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reg = TMP007_TOBJ_HIGH_LIMIT;
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else
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reg = TMP007_TOBJ_LOW_LIMIT;
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break;
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default:
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return -EINVAL;
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}
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/* Full scale threshold value is +/- 256 degree Celsius */
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if (val < -256 || val > 255)
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return -EINVAL;
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/* Shift length 7 bits = 6(15:6) + 1(0.5 LSB) */
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return i2c_smbus_write_word_swapped(data->client, reg, (val << 7));
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}
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static IIO_CONST_ATTR(sampling_frequency_available, "4 2 1 0.5 0.25");
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static struct attribute *tmp007_attributes[] = {
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&iio_const_attr_sampling_frequency_available.dev_attr.attr,
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NULL
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};
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static const struct attribute_group tmp007_attribute_group = {
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.attrs = tmp007_attributes,
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};
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static const struct iio_event_spec tmp007_obj_event[] = {
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{
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_RISING,
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.mask_separate = BIT(IIO_EV_INFO_VALUE) |
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BIT(IIO_EV_INFO_ENABLE),
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},
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{
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_FALLING,
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.mask_separate = BIT(IIO_EV_INFO_VALUE) |
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BIT(IIO_EV_INFO_ENABLE),
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},
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};
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static const struct iio_event_spec tmp007_die_event[] = {
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{
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_RISING,
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.mask_separate = BIT(IIO_EV_INFO_VALUE) |
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BIT(IIO_EV_INFO_ENABLE),
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},
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{
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_FALLING,
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.mask_separate = BIT(IIO_EV_INFO_VALUE) |
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BIT(IIO_EV_INFO_ENABLE),
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},
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};
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static const struct iio_chan_spec tmp007_channels[] = {
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{
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.type = IIO_TEMP,
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.modified = 1,
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.channel2 = IIO_MOD_TEMP_AMBIENT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
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.event_spec = tmp007_die_event,
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.num_event_specs = ARRAY_SIZE(tmp007_die_event),
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},
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{
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.type = IIO_TEMP,
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.modified = 1,
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.channel2 = IIO_MOD_TEMP_OBJECT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
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.event_spec = tmp007_obj_event,
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.num_event_specs = ARRAY_SIZE(tmp007_obj_event),
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}
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};
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static const struct iio_info tmp007_info = {
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.read_raw = tmp007_read_raw,
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.write_raw = tmp007_write_raw,
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.read_event_config = tmp007_read_event_config,
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.write_event_config = tmp007_write_event_config,
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.read_event_value = tmp007_read_thresh,
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.write_event_value = tmp007_write_thresh,
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.attrs = &tmp007_attribute_group,
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};
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static bool tmp007_identify(struct i2c_client *client)
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{
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int manf_id, dev_id;
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manf_id = i2c_smbus_read_word_swapped(client, TMP007_MANUFACTURER_ID);
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if (manf_id < 0)
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return false;
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dev_id = i2c_smbus_read_word_swapped(client, TMP007_DEVICE_ID);
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if (dev_id < 0)
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return false;
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return (manf_id == TMP007_MANUFACTURER_MAGIC && dev_id == TMP007_DEVICE_MAGIC);
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}
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static void tmp007_powerdown_action_cb(void *priv)
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{
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struct tmp007_data *data = priv;
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tmp007_powerdown(data);
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}
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static int tmp007_probe(struct i2c_client *client,
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const struct i2c_device_id *tmp007_id)
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{
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struct tmp007_data *data;
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struct iio_dev *indio_dev;
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int ret;
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if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
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return -EOPNOTSUPP;
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if (!tmp007_identify(client)) {
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dev_err(&client->dev, "TMP007 not found\n");
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return -ENODEV;
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}
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indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
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if (!indio_dev)
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return -ENOMEM;
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data = iio_priv(indio_dev);
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i2c_set_clientdata(client, indio_dev);
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data->client = client;
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mutex_init(&data->lock);
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indio_dev->name = "tmp007";
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->info = &tmp007_info;
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indio_dev->channels = tmp007_channels;
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indio_dev->num_channels = ARRAY_SIZE(tmp007_channels);
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/*
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* Set Configuration register:
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* 1. Conversion ON
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* 2. ALERT enable
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* 3. Transient correction enable
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*/
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ret = i2c_smbus_read_word_swapped(data->client, TMP007_CONFIG);
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if (ret < 0)
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return ret;
|
|
|
|
data->config = ret;
|
|
data->config |= (TMP007_CONFIG_CONV_EN | TMP007_CONFIG_ALERT_EN | TMP007_CONFIG_TC_EN);
|
|
|
|
ret = i2c_smbus_write_word_swapped(data->client, TMP007_CONFIG,
|
|
data->config);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = devm_add_action_or_reset(&client->dev, tmp007_powerdown_action_cb, data);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Only the following flags can activate ALERT pin. Data conversion/validity flags
|
|
* flags can still be polled for getting temperature data
|
|
*
|
|
* Set Status Mask register:
|
|
* 1. Object temperature high limit enable
|
|
* 2. Object temperature low limit enable
|
|
* 3. TDIE temperature high limit enable
|
|
* 4. TDIE temperature low limit enable
|
|
*/
|
|
|
|
ret = i2c_smbus_read_word_swapped(data->client, TMP007_STATUS_MASK);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
data->status_mask = ret;
|
|
data->status_mask |= (TMP007_STATUS_OHF | TMP007_STATUS_OLF
|
|
| TMP007_STATUS_LHF | TMP007_STATUS_LLF);
|
|
|
|
ret = i2c_smbus_write_word_swapped(data->client, TMP007_STATUS_MASK, data->status_mask);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (client->irq) {
|
|
ret = devm_request_threaded_irq(&client->dev, client->irq,
|
|
NULL, tmp007_interrupt_handler,
|
|
IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
|
|
tmp007_id->name, indio_dev);
|
|
if (ret) {
|
|
dev_err(&client->dev, "irq request error %d\n", -ret);
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return devm_iio_device_register(&client->dev, indio_dev);
|
|
}
|
|
|
|
static int tmp007_suspend(struct device *dev)
|
|
{
|
|
struct tmp007_data *data = iio_priv(i2c_get_clientdata(
|
|
to_i2c_client(dev)));
|
|
|
|
return tmp007_powerdown(data);
|
|
}
|
|
|
|
static int tmp007_resume(struct device *dev)
|
|
{
|
|
struct tmp007_data *data = iio_priv(i2c_get_clientdata(
|
|
to_i2c_client(dev)));
|
|
|
|
return i2c_smbus_write_word_swapped(data->client, TMP007_CONFIG,
|
|
data->config | TMP007_CONFIG_CONV_EN);
|
|
}
|
|
|
|
static DEFINE_SIMPLE_DEV_PM_OPS(tmp007_pm_ops, tmp007_suspend, tmp007_resume);
|
|
|
|
static const struct of_device_id tmp007_of_match[] = {
|
|
{ .compatible = "ti,tmp007", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, tmp007_of_match);
|
|
|
|
static const struct i2c_device_id tmp007_id[] = {
|
|
{ "tmp007", 0 },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, tmp007_id);
|
|
|
|
static struct i2c_driver tmp007_driver = {
|
|
.driver = {
|
|
.name = "tmp007",
|
|
.of_match_table = tmp007_of_match,
|
|
.pm = pm_sleep_ptr(&tmp007_pm_ops),
|
|
},
|
|
.probe = tmp007_probe,
|
|
.id_table = tmp007_id,
|
|
};
|
|
module_i2c_driver(tmp007_driver);
|
|
|
|
MODULE_AUTHOR("Manivannan Sadhasivam <manivannanece23@gmail.com>");
|
|
MODULE_DESCRIPTION("TI TMP007 IR thermopile sensor driver");
|
|
MODULE_LICENSE("GPL");
|