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586 lines
14 KiB
586 lines
14 KiB
// 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 <[email protected]> |
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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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|
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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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|
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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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|
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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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/* |
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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; |
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data->config = ret; |
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data->config |= (TMP007_CONFIG_CONV_EN | TMP007_CONFIG_ALERT_EN | TMP007_CONFIG_TC_EN); |
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ret = i2c_smbus_write_word_swapped(data->client, TMP007_CONFIG, |
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data->config); |
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if (ret < 0) |
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return ret; |
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ret = devm_add_action_or_reset(&client->dev, tmp007_powerdown_action_cb, data); |
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if (ret) |
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return ret; |
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|
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/* |
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* Only the following flags can activate ALERT pin. Data conversion/validity flags |
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* flags can still be polled for getting temperature data |
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* |
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* Set Status Mask register: |
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* 1. Object temperature high limit enable |
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* 2. Object temperature low limit enable |
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* 3. TDIE temperature high limit enable |
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* 4. TDIE temperature low limit enable |
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*/ |
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ret = i2c_smbus_read_word_swapped(data->client, TMP007_STATUS_MASK); |
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if (ret < 0) |
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return ret; |
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data->status_mask = ret; |
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data->status_mask |= (TMP007_STATUS_OHF | TMP007_STATUS_OLF |
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| TMP007_STATUS_LHF | TMP007_STATUS_LLF); |
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ret = i2c_smbus_write_word_swapped(data->client, TMP007_STATUS_MASK, data->status_mask); |
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if (ret < 0) |
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return ret; |
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|
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if (client->irq) { |
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ret = devm_request_threaded_irq(&client->dev, client->irq, |
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NULL, tmp007_interrupt_handler, |
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IRQF_TRIGGER_FALLING | IRQF_ONESHOT, |
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tmp007_id->name, indio_dev); |
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if (ret) { |
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dev_err(&client->dev, "irq request error %d\n", -ret); |
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return ret; |
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} |
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} |
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|
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return devm_iio_device_register(&client->dev, indio_dev); |
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} |
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|
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#ifdef CONFIG_PM_SLEEP |
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static int tmp007_suspend(struct device *dev) |
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{ |
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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); |
|
} |
|
#endif |
|
|
|
static 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 = &tmp007_pm_ops, |
|
}, |
|
.probe = tmp007_probe, |
|
.id_table = tmp007_id, |
|
}; |
|
module_i2c_driver(tmp007_driver); |
|
|
|
MODULE_AUTHOR("Manivannan Sadhasivam <[email protected]>"); |
|
MODULE_DESCRIPTION("TI TMP007 IR thermopile sensor driver"); |
|
MODULE_LICENSE("GPL");
|
|
|