forked from Minki/linux
d136431430
This prevents use of this driver with ACPI via PRP0001 and is an example of an anti pattern I'm trying to remove from IIO. Hence drop from this driver. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Acked-by: Matt Ranostay <matt.ranostay@konsulko.com> Link: https://lore.kernel.org/r/20200910173242.621168-31-jic23@kernel.org
431 lines
10 KiB
C
431 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* hdc100x.c - Support for the TI HDC100x temperature + humidity sensors
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*
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* Copyright (C) 2015, 2018
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* Author: Matt Ranostay <matt.ranostay@konsulko.com>
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*
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* Datasheets:
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* https://www.ti.com/product/HDC1000/datasheet
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* https://www.ti.com/product/HDC1008/datasheet
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* https://www.ti.com/product/HDC1010/datasheet
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* https://www.ti.com/product/HDC1050/datasheet
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* https://www.ti.com/product/HDC1080/datasheet
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*/
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/init.h>
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#include <linux/i2c.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/buffer.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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#define HDC100X_REG_TEMP 0x00
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#define HDC100X_REG_HUMIDITY 0x01
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#define HDC100X_REG_CONFIG 0x02
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#define HDC100X_REG_CONFIG_ACQ_MODE BIT(12)
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#define HDC100X_REG_CONFIG_HEATER_EN BIT(13)
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struct hdc100x_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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/* integration time of the sensor */
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int adc_int_us[2];
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/* Ensure natural alignment of timestamp */
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struct {
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__be16 channels[2];
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s64 ts __aligned(8);
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} scan;
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};
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/* integration time in us */
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static const int hdc100x_int_time[][3] = {
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{ 6350, 3650, 0 }, /* IIO_TEMP channel*/
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{ 6500, 3850, 2500 }, /* IIO_HUMIDITYRELATIVE channel */
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};
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/* HDC100X_REG_CONFIG shift and mask values */
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static const struct {
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int shift;
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int mask;
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} hdc100x_resolution_shift[2] = {
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{ /* IIO_TEMP channel */
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.shift = 10,
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.mask = 1
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},
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{ /* IIO_HUMIDITYRELATIVE channel */
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.shift = 8,
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.mask = 3,
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},
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};
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static IIO_CONST_ATTR(temp_integration_time_available,
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"0.00365 0.00635");
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static IIO_CONST_ATTR(humidityrelative_integration_time_available,
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"0.0025 0.00385 0.0065");
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static IIO_CONST_ATTR(out_current_heater_raw_available,
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"0 1");
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static struct attribute *hdc100x_attributes[] = {
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&iio_const_attr_temp_integration_time_available.dev_attr.attr,
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&iio_const_attr_humidityrelative_integration_time_available.dev_attr.attr,
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&iio_const_attr_out_current_heater_raw_available.dev_attr.attr,
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NULL
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};
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static const struct attribute_group hdc100x_attribute_group = {
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.attrs = hdc100x_attributes,
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};
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static const struct iio_chan_spec hdc100x_channels[] = {
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{
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.type = IIO_TEMP,
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.address = HDC100X_REG_TEMP,
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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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BIT(IIO_CHAN_INFO_INT_TIME) |
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BIT(IIO_CHAN_INFO_OFFSET),
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.scan_index = 0,
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.scan_type = {
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.sign = 's',
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.realbits = 16,
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.storagebits = 16,
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.endianness = IIO_BE,
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},
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},
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{
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.type = IIO_HUMIDITYRELATIVE,
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.address = HDC100X_REG_HUMIDITY,
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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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BIT(IIO_CHAN_INFO_INT_TIME),
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.scan_index = 1,
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.scan_type = {
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.sign = 'u',
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.realbits = 16,
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.storagebits = 16,
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.endianness = IIO_BE,
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},
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},
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{
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.type = IIO_CURRENT,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.extend_name = "heater",
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.output = 1,
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.scan_index = -1,
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},
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IIO_CHAN_SOFT_TIMESTAMP(2),
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};
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static const unsigned long hdc100x_scan_masks[] = {0x3, 0};
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static int hdc100x_update_config(struct hdc100x_data *data, int mask, int val)
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{
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int tmp = (~mask & data->config) | val;
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int ret;
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ret = i2c_smbus_write_word_swapped(data->client,
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HDC100X_REG_CONFIG, tmp);
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if (!ret)
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data->config = tmp;
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return ret;
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}
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static int hdc100x_set_it_time(struct hdc100x_data *data, int chan, int val2)
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{
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int shift = hdc100x_resolution_shift[chan].shift;
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int ret = -EINVAL;
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int i;
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for (i = 0; i < ARRAY_SIZE(hdc100x_int_time[chan]); i++) {
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if (val2 && val2 == hdc100x_int_time[chan][i]) {
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ret = hdc100x_update_config(data,
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hdc100x_resolution_shift[chan].mask << shift,
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i << shift);
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if (!ret)
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data->adc_int_us[chan] = val2;
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break;
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}
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}
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return ret;
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}
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static int hdc100x_get_measurement(struct hdc100x_data *data,
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struct iio_chan_spec const *chan)
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{
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struct i2c_client *client = data->client;
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int delay = data->adc_int_us[chan->address];
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int ret;
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__be16 val;
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/* start measurement */
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ret = i2c_smbus_write_byte(client, chan->address);
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if (ret < 0) {
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dev_err(&client->dev, "cannot start measurement");
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return ret;
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}
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/* wait for integration time to pass */
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usleep_range(delay, delay + 1000);
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/* read measurement */
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ret = i2c_master_recv(data->client, (char *)&val, sizeof(val));
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if (ret < 0) {
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dev_err(&client->dev, "cannot read sensor data\n");
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return ret;
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}
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return be16_to_cpu(val);
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}
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static int hdc100x_get_heater_status(struct hdc100x_data *data)
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{
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return !!(data->config & HDC100X_REG_CONFIG_HEATER_EN);
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}
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static int hdc100x_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan, int *val,
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int *val2, long mask)
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{
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struct hdc100x_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_RAW: {
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int ret;
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mutex_lock(&data->lock);
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if (chan->type == IIO_CURRENT) {
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*val = hdc100x_get_heater_status(data);
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ret = IIO_VAL_INT;
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} else {
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ret = iio_device_claim_direct_mode(indio_dev);
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if (ret) {
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mutex_unlock(&data->lock);
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return ret;
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}
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ret = hdc100x_get_measurement(data, chan);
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iio_device_release_direct_mode(indio_dev);
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if (ret >= 0) {
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*val = ret;
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ret = IIO_VAL_INT;
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}
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}
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mutex_unlock(&data->lock);
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return ret;
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}
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case IIO_CHAN_INFO_INT_TIME:
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*val = 0;
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*val2 = data->adc_int_us[chan->address];
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return IIO_VAL_INT_PLUS_MICRO;
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case IIO_CHAN_INFO_SCALE:
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if (chan->type == IIO_TEMP) {
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*val = 165000;
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*val2 = 65536;
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return IIO_VAL_FRACTIONAL;
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} else {
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*val = 100000;
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*val2 = 65536;
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return IIO_VAL_FRACTIONAL;
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}
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break;
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case IIO_CHAN_INFO_OFFSET:
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*val = -15887;
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*val2 = 515151;
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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 hdc100x_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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struct hdc100x_data *data = iio_priv(indio_dev);
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int ret = -EINVAL;
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switch (mask) {
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case IIO_CHAN_INFO_INT_TIME:
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if (val != 0)
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return -EINVAL;
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mutex_lock(&data->lock);
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ret = hdc100x_set_it_time(data, chan->address, val2);
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mutex_unlock(&data->lock);
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return ret;
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case IIO_CHAN_INFO_RAW:
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if (chan->type != IIO_CURRENT || val2 != 0)
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return -EINVAL;
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mutex_lock(&data->lock);
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ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_HEATER_EN,
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val ? HDC100X_REG_CONFIG_HEATER_EN : 0);
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mutex_unlock(&data->lock);
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return ret;
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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 hdc100x_buffer_postenable(struct iio_dev *indio_dev)
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{
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struct hdc100x_data *data = iio_priv(indio_dev);
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int ret;
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/* Buffer is enabled. First set ACQ Mode, then attach poll func */
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mutex_lock(&data->lock);
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ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE,
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HDC100X_REG_CONFIG_ACQ_MODE);
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mutex_unlock(&data->lock);
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return ret;
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}
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static int hdc100x_buffer_predisable(struct iio_dev *indio_dev)
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{
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struct hdc100x_data *data = iio_priv(indio_dev);
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int ret;
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mutex_lock(&data->lock);
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ret = hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE, 0);
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mutex_unlock(&data->lock);
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return ret;
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}
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static const struct iio_buffer_setup_ops hdc_buffer_setup_ops = {
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.postenable = hdc100x_buffer_postenable,
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.predisable = hdc100x_buffer_predisable,
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};
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static irqreturn_t hdc100x_trigger_handler(int irq, void *p)
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{
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struct iio_poll_func *pf = p;
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struct iio_dev *indio_dev = pf->indio_dev;
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struct hdc100x_data *data = iio_priv(indio_dev);
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struct i2c_client *client = data->client;
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int delay = data->adc_int_us[0] + data->adc_int_us[1];
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int ret;
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/* dual read starts at temp register */
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mutex_lock(&data->lock);
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ret = i2c_smbus_write_byte(client, HDC100X_REG_TEMP);
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if (ret < 0) {
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dev_err(&client->dev, "cannot start measurement\n");
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goto err;
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}
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usleep_range(delay, delay + 1000);
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ret = i2c_master_recv(client, (u8 *)data->scan.channels, 4);
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if (ret < 0) {
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dev_err(&client->dev, "cannot read sensor data\n");
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goto err;
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}
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iio_push_to_buffers_with_timestamp(indio_dev, &data->scan,
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iio_get_time_ns(indio_dev));
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err:
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mutex_unlock(&data->lock);
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iio_trigger_notify_done(indio_dev->trig);
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return IRQ_HANDLED;
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}
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static const struct iio_info hdc100x_info = {
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.read_raw = hdc100x_read_raw,
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.write_raw = hdc100x_write_raw,
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.attrs = &hdc100x_attribute_group,
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};
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static int hdc100x_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct iio_dev *indio_dev;
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struct hdc100x_data *data;
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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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I2C_FUNC_SMBUS_BYTE | I2C_FUNC_I2C))
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return -EOPNOTSUPP;
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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 = dev_name(&client->dev);
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->info = &hdc100x_info;
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indio_dev->channels = hdc100x_channels;
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indio_dev->num_channels = ARRAY_SIZE(hdc100x_channels);
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indio_dev->available_scan_masks = hdc100x_scan_masks;
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/* be sure we are in a known state */
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hdc100x_set_it_time(data, 0, hdc100x_int_time[0][0]);
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hdc100x_set_it_time(data, 1, hdc100x_int_time[1][0]);
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hdc100x_update_config(data, HDC100X_REG_CONFIG_ACQ_MODE, 0);
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ret = devm_iio_triggered_buffer_setup(&client->dev,
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indio_dev, NULL,
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hdc100x_trigger_handler,
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&hdc_buffer_setup_ops);
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if (ret < 0) {
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dev_err(&client->dev, "iio triggered buffer setup failed\n");
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return ret;
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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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static const struct i2c_device_id hdc100x_id[] = {
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{ "hdc100x", 0 },
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{ "hdc1000", 0 },
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{ "hdc1008", 0 },
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{ "hdc1010", 0 },
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{ "hdc1050", 0 },
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{ "hdc1080", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, hdc100x_id);
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static const struct of_device_id hdc100x_dt_ids[] = {
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{ .compatible = "ti,hdc1000" },
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{ .compatible = "ti,hdc1008" },
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{ .compatible = "ti,hdc1010" },
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{ .compatible = "ti,hdc1050" },
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{ .compatible = "ti,hdc1080" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, hdc100x_dt_ids);
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static struct i2c_driver hdc100x_driver = {
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.driver = {
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.name = "hdc100x",
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.of_match_table = hdc100x_dt_ids,
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},
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.probe = hdc100x_probe,
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.id_table = hdc100x_id,
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};
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module_i2c_driver(hdc100x_driver);
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MODULE_AUTHOR("Matt Ranostay <matt.ranostay@konsulko.com>");
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MODULE_DESCRIPTION("TI HDC100x humidity and temperature sensor driver");
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MODULE_LICENSE("GPL");
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