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path: root/drivers/iio/temperature/mlx90614.c
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Diffstat (limited to 'drivers/iio/temperature/mlx90614.c')
-rw-r--r--drivers/iio/temperature/mlx90614.c787
1 files changed, 787 insertions, 0 deletions
diff --git a/drivers/iio/temperature/mlx90614.c b/drivers/iio/temperature/mlx90614.c
new file mode 100644
index 0000000000..07bb5df24a
--- /dev/null
+++ b/drivers/iio/temperature/mlx90614.c
@@ -0,0 +1,787 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * mlx90614.c - Support for Melexis MLX90614/MLX90615 contactless IR temperature sensor
+ *
+ * Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net>
+ * Copyright (c) 2015 Essensium NV
+ * Copyright (c) 2015 Melexis
+ *
+ * Driver for the Melexis MLX90614/MLX90615 I2C 16-bit IR thermopile sensor
+ *
+ * MLX90614 - 17-bit ADC + MLX90302 DSP
+ * MLX90615 - 16-bit ADC + MLX90325 DSP
+ *
+ * (7-bit I2C slave address 0x5a, 100KHz bus speed only!)
+ *
+ * To wake up from sleep mode, the SDA line must be held low while SCL is high
+ * for at least 33ms. This is achieved with an extra GPIO that can be connected
+ * directly to the SDA line. In normal operation, the GPIO is set as input and
+ * will not interfere in I2C communication. While the GPIO is driven low, the
+ * i2c adapter is locked since it cannot be used by other clients. The SCL line
+ * always has a pull-up so we do not need an extra GPIO to drive it high. If
+ * the "wakeup" GPIO is not given, power management will be disabled.
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/jiffies.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/pm_runtime.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#define MLX90614_OP_RAM 0x00
+#define MLX90614_OP_EEPROM 0x20
+#define MLX90614_OP_SLEEP 0xff
+
+#define MLX90615_OP_EEPROM 0x10
+#define MLX90615_OP_RAM 0x20
+#define MLX90615_OP_SLEEP 0xc6
+
+/* Control bits in configuration register */
+#define MLX90614_CONFIG_IIR_SHIFT 0 /* IIR coefficient */
+#define MLX90614_CONFIG_IIR_MASK (0x7 << MLX90614_CONFIG_IIR_SHIFT)
+#define MLX90614_CONFIG_DUAL_SHIFT 6 /* single (0) or dual (1) IR sensor */
+#define MLX90614_CONFIG_DUAL_MASK (1 << MLX90614_CONFIG_DUAL_SHIFT)
+#define MLX90614_CONFIG_FIR_SHIFT 8 /* FIR coefficient */
+#define MLX90614_CONFIG_FIR_MASK (0x7 << MLX90614_CONFIG_FIR_SHIFT)
+
+#define MLX90615_CONFIG_IIR_SHIFT 12 /* IIR coefficient */
+#define MLX90615_CONFIG_IIR_MASK (0x7 << MLX90615_CONFIG_IIR_SHIFT)
+
+/* Timings (in ms) */
+#define MLX90614_TIMING_EEPROM 20 /* time for EEPROM write/erase to complete */
+#define MLX90614_TIMING_WAKEUP 34 /* time to hold SDA low for wake-up */
+#define MLX90614_TIMING_STARTUP 250 /* time before first data after wake-up */
+
+#define MLX90615_TIMING_WAKEUP 22 /* time to hold SCL low for wake-up */
+
+#define MLX90614_AUTOSLEEP_DELAY 5000 /* default autosleep delay */
+
+/* Magic constants */
+#define MLX90614_CONST_OFFSET_DEC -13657 /* decimal part of the Kelvin offset */
+#define MLX90614_CONST_OFFSET_REM 500000 /* remainder of offset (273.15*50) */
+#define MLX90614_CONST_SCALE 20 /* Scale in milliKelvin (0.02 * 1000) */
+#define MLX90614_CONST_FIR 0x7 /* Fixed value for FIR part of low pass filter */
+
+/* Non-constant mask variant of FIELD_GET() and FIELD_PREP() */
+#define field_get(_mask, _reg) (((_reg) & (_mask)) >> (ffs(_mask) - 1))
+#define field_prep(_mask, _val) (((_val) << (ffs(_mask) - 1)) & (_mask))
+
+struct mlx_chip_info {
+ /* EEPROM offsets with 16-bit data, MSB first */
+ /* emissivity correction coefficient */
+ u8 op_eeprom_emissivity;
+ u8 op_eeprom_config1;
+ /* RAM offsets with 16-bit data, MSB first */
+ /* ambient temperature */
+ u8 op_ram_ta;
+ /* object 1 temperature */
+ u8 op_ram_tobj1;
+ /* object 2 temperature */
+ u8 op_ram_tobj2;
+ u8 op_sleep;
+ /* support for two input channels (MLX90614 only) */
+ u8 dual_channel;
+ u8 wakeup_delay_ms;
+ u16 emissivity_max;
+ u16 fir_config_mask;
+ u16 iir_config_mask;
+ int iir_valid_offset;
+ u16 iir_values[8];
+ int iir_freqs[8][2];
+};
+
+struct mlx90614_data {
+ struct i2c_client *client;
+ struct mutex lock; /* for EEPROM access only */
+ struct gpio_desc *wakeup_gpio; /* NULL to disable sleep/wake-up */
+ const struct mlx_chip_info *chip_info; /* Chip hardware details */
+ unsigned long ready_timestamp; /* in jiffies */
+};
+
+/*
+ * Erase an address and write word.
+ * The mutex must be locked before calling.
+ */
+static s32 mlx90614_write_word(const struct i2c_client *client, u8 command,
+ u16 value)
+{
+ /*
+ * Note: The mlx90614 requires a PEC on writing but does not send us a
+ * valid PEC on reading. Hence, we cannot set I2C_CLIENT_PEC in
+ * i2c_client.flags. As a workaround, we use i2c_smbus_xfer here.
+ */
+ union i2c_smbus_data data;
+ s32 ret;
+
+ dev_dbg(&client->dev, "Writing 0x%x to address 0x%x", value, command);
+
+ data.word = 0x0000; /* erase command */
+ ret = i2c_smbus_xfer(client->adapter, client->addr,
+ client->flags | I2C_CLIENT_PEC,
+ I2C_SMBUS_WRITE, command,
+ I2C_SMBUS_WORD_DATA, &data);
+ if (ret < 0)
+ return ret;
+
+ msleep(MLX90614_TIMING_EEPROM);
+
+ data.word = value; /* actual write */
+ ret = i2c_smbus_xfer(client->adapter, client->addr,
+ client->flags | I2C_CLIENT_PEC,
+ I2C_SMBUS_WRITE, command,
+ I2C_SMBUS_WORD_DATA, &data);
+
+ msleep(MLX90614_TIMING_EEPROM);
+
+ return ret;
+}
+
+/*
+ * Find the IIR value inside iir_values array and return its position
+ * which is equivalent to the bit value in sensor register
+ */
+static inline s32 mlx90614_iir_search(const struct i2c_client *client,
+ int value)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct mlx90614_data *data = iio_priv(indio_dev);
+ const struct mlx_chip_info *chip_info = data->chip_info;
+ int i;
+ s32 ret;
+
+ for (i = chip_info->iir_valid_offset;
+ i < ARRAY_SIZE(chip_info->iir_values);
+ i++) {
+ if (value == chip_info->iir_values[i])
+ break;
+ }
+
+ if (i == ARRAY_SIZE(chip_info->iir_values))
+ return -EINVAL;
+
+ /*
+ * CONFIG register values must not be changed so
+ * we must read them before we actually write
+ * changes
+ */
+ ret = i2c_smbus_read_word_data(client, chip_info->op_eeprom_config1);
+ if (ret < 0)
+ return ret;
+
+ /* Modify FIR on parts which have configurable FIR filter */
+ if (chip_info->fir_config_mask) {
+ ret &= ~chip_info->fir_config_mask;
+ ret |= field_prep(chip_info->fir_config_mask, MLX90614_CONST_FIR);
+ }
+
+ ret &= ~chip_info->iir_config_mask;
+ ret |= field_prep(chip_info->iir_config_mask, i);
+
+ /* Write changed values */
+ ret = mlx90614_write_word(client, chip_info->op_eeprom_config1, ret);
+ return ret;
+}
+
+#ifdef CONFIG_PM
+/*
+ * If @startup is true, make sure MLX90614_TIMING_STARTUP ms have elapsed since
+ * the last wake-up. This is normally only needed to get a valid temperature
+ * reading. EEPROM access does not need such delay.
+ * Return 0 on success, <0 on error.
+ */
+static int mlx90614_power_get(struct mlx90614_data *data, bool startup)
+{
+ unsigned long now;
+ int ret;
+
+ if (!data->wakeup_gpio)
+ return 0;
+
+ ret = pm_runtime_resume_and_get(&data->client->dev);
+ if (ret < 0)
+ return ret;
+
+ if (startup) {
+ now = jiffies;
+ if (time_before(now, data->ready_timestamp) &&
+ msleep_interruptible(jiffies_to_msecs(
+ data->ready_timestamp - now)) != 0) {
+ pm_runtime_put_autosuspend(&data->client->dev);
+ return -EINTR;
+ }
+ }
+
+ return 0;
+}
+
+static void mlx90614_power_put(struct mlx90614_data *data)
+{
+ if (!data->wakeup_gpio)
+ return;
+
+ pm_runtime_mark_last_busy(&data->client->dev);
+ pm_runtime_put_autosuspend(&data->client->dev);
+}
+#else
+static inline int mlx90614_power_get(struct mlx90614_data *data, bool startup)
+{
+ return 0;
+}
+
+static inline void mlx90614_power_put(struct mlx90614_data *data)
+{
+}
+#endif
+
+static int mlx90614_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *channel, int *val,
+ int *val2, long mask)
+{
+ struct mlx90614_data *data = iio_priv(indio_dev);
+ const struct mlx_chip_info *chip_info = data->chip_info;
+ u8 cmd, idx;
+ s32 ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW: /* 0.02K / LSB */
+ switch (channel->channel2) {
+ case IIO_MOD_TEMP_AMBIENT:
+ cmd = chip_info->op_ram_ta;
+ break;
+ case IIO_MOD_TEMP_OBJECT:
+ if (chip_info->dual_channel && channel->channel)
+ return -EINVAL;
+
+ switch (channel->channel) {
+ case 0:
+ cmd = chip_info->op_ram_tobj1;
+ break;
+ case 1:
+ cmd = chip_info->op_ram_tobj2;
+ break;
+ default:
+ return -EINVAL;
+ }
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = mlx90614_power_get(data, true);
+ if (ret < 0)
+ return ret;
+ ret = i2c_smbus_read_word_data(data->client, cmd);
+ mlx90614_power_put(data);
+
+ if (ret < 0)
+ return ret;
+
+ /* MSB is an error flag */
+ if (ret & 0x8000)
+ return -EIO;
+
+ *val = ret;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_OFFSET:
+ *val = MLX90614_CONST_OFFSET_DEC;
+ *val2 = MLX90614_CONST_OFFSET_REM;
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_CHAN_INFO_SCALE:
+ *val = MLX90614_CONST_SCALE;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/emissivity_max / LSB */
+ ret = mlx90614_power_get(data, false);
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&data->lock);
+ ret = i2c_smbus_read_word_data(data->client,
+ chip_info->op_eeprom_emissivity);
+ mutex_unlock(&data->lock);
+ mlx90614_power_put(data);
+
+ if (ret < 0)
+ return ret;
+
+ if (ret == chip_info->emissivity_max) {
+ *val = 1;
+ *val2 = 0;
+ } else {
+ *val = 0;
+ *val2 = ret * NSEC_PER_SEC / chip_info->emissivity_max;
+ }
+ return IIO_VAL_INT_PLUS_NANO;
+ /* IIR setting with FIR=1024 (MLX90614) or FIR=65536 (MLX90615) */
+ case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+ ret = mlx90614_power_get(data, false);
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&data->lock);
+ ret = i2c_smbus_read_word_data(data->client,
+ chip_info->op_eeprom_config1);
+ mutex_unlock(&data->lock);
+ mlx90614_power_put(data);
+
+ if (ret < 0)
+ return ret;
+
+ idx = field_get(chip_info->iir_config_mask, ret) -
+ chip_info->iir_valid_offset;
+
+ *val = chip_info->iir_values[idx] / 100;
+ *val2 = (chip_info->iir_values[idx] % 100) * 10000;
+ return IIO_VAL_INT_PLUS_MICRO;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int mlx90614_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *channel, int val,
+ int val2, long mask)
+{
+ struct mlx90614_data *data = iio_priv(indio_dev);
+ const struct mlx_chip_info *chip_info = data->chip_info;
+ s32 ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_CALIBEMISSIVITY: /* 1/emissivity_max / LSB */
+ if (val < 0 || val2 < 0 || val > 1 || (val == 1 && val2 != 0))
+ return -EINVAL;
+ val = val * chip_info->emissivity_max +
+ val2 * chip_info->emissivity_max / NSEC_PER_SEC;
+
+ ret = mlx90614_power_get(data, false);
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&data->lock);
+ ret = mlx90614_write_word(data->client,
+ chip_info->op_eeprom_emissivity, val);
+ mutex_unlock(&data->lock);
+ mlx90614_power_put(data);
+
+ return ret;
+ case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY: /* IIR Filter setting */
+ if (val < 0 || val2 < 0)
+ return -EINVAL;
+
+ ret = mlx90614_power_get(data, false);
+ if (ret < 0)
+ return ret;
+
+ mutex_lock(&data->lock);
+ ret = mlx90614_iir_search(data->client,
+ val * 100 + val2 / 10000);
+ mutex_unlock(&data->lock);
+ mlx90614_power_put(data);
+
+ return ret;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int mlx90614_write_raw_get_fmt(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *channel,
+ long mask)
+{
+ switch (mask) {
+ case IIO_CHAN_INFO_CALIBEMISSIVITY:
+ return IIO_VAL_INT_PLUS_NANO;
+ case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+ return IIO_VAL_INT_PLUS_MICRO;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int mlx90614_read_avail(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ const int **vals, int *type, int *length,
+ long mask)
+{
+ struct mlx90614_data *data = iio_priv(indio_dev);
+ const struct mlx_chip_info *chip_info = data->chip_info;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+ *vals = (int *)chip_info->iir_freqs;
+ *type = IIO_VAL_INT_PLUS_MICRO;
+ *length = 2 * (ARRAY_SIZE(chip_info->iir_freqs) -
+ chip_info->iir_valid_offset);
+ return IIO_AVAIL_LIST;
+ default:
+ return -EINVAL;
+ }
+}
+
+static const struct iio_chan_spec mlx90614_channels[] = {
+ {
+ .type = IIO_TEMP,
+ .modified = 1,
+ .channel2 = IIO_MOD_TEMP_AMBIENT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ },
+ {
+ .type = IIO_TEMP,
+ .modified = 1,
+ .channel2 = IIO_MOD_TEMP_OBJECT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) |
+ BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
+ .info_mask_separate_available =
+ BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ },
+ {
+ .type = IIO_TEMP,
+ .indexed = 1,
+ .modified = 1,
+ .channel = 1,
+ .channel2 = IIO_MOD_TEMP_OBJECT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_CALIBEMISSIVITY) |
+ BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
+ .info_mask_separate_available =
+ BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) |
+ BIT(IIO_CHAN_INFO_SCALE),
+ },
+};
+
+static const struct iio_info mlx90614_info = {
+ .read_raw = mlx90614_read_raw,
+ .write_raw = mlx90614_write_raw,
+ .write_raw_get_fmt = mlx90614_write_raw_get_fmt,
+ .read_avail = mlx90614_read_avail,
+};
+
+#ifdef CONFIG_PM
+static int mlx90614_sleep(struct mlx90614_data *data)
+{
+ const struct mlx_chip_info *chip_info = data->chip_info;
+ s32 ret;
+
+ if (!data->wakeup_gpio) {
+ dev_dbg(&data->client->dev, "Sleep disabled");
+ return -ENOSYS;
+ }
+
+ dev_dbg(&data->client->dev, "Requesting sleep");
+
+ mutex_lock(&data->lock);
+ ret = i2c_smbus_xfer(data->client->adapter, data->client->addr,
+ data->client->flags | I2C_CLIENT_PEC,
+ I2C_SMBUS_WRITE, chip_info->op_sleep,
+ I2C_SMBUS_BYTE, NULL);
+ mutex_unlock(&data->lock);
+
+ return ret;
+}
+
+static int mlx90614_wakeup(struct mlx90614_data *data)
+{
+ const struct mlx_chip_info *chip_info = data->chip_info;
+
+ if (!data->wakeup_gpio) {
+ dev_dbg(&data->client->dev, "Wake-up disabled");
+ return -ENOSYS;
+ }
+
+ dev_dbg(&data->client->dev, "Requesting wake-up");
+
+ i2c_lock_bus(data->client->adapter, I2C_LOCK_ROOT_ADAPTER);
+ gpiod_direction_output(data->wakeup_gpio, 0);
+ msleep(chip_info->wakeup_delay_ms);
+ gpiod_direction_input(data->wakeup_gpio);
+ i2c_unlock_bus(data->client->adapter, I2C_LOCK_ROOT_ADAPTER);
+
+ data->ready_timestamp = jiffies +
+ msecs_to_jiffies(MLX90614_TIMING_STARTUP);
+
+ /*
+ * Quirk: the i2c controller may get confused right after the
+ * wake-up signal has been sent. As a workaround, do a dummy read.
+ * If the read fails, the controller will probably be reset so that
+ * further reads will work.
+ */
+ i2c_smbus_read_word_data(data->client, chip_info->op_eeprom_config1);
+
+ return 0;
+}
+
+/* Return wake-up GPIO or NULL if sleep functionality should be disabled. */
+static struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client)
+{
+ struct gpio_desc *gpio;
+
+ if (!i2c_check_functionality(client->adapter,
+ I2C_FUNC_SMBUS_WRITE_BYTE)) {
+ dev_info(&client->dev,
+ "i2c adapter does not support SMBUS_WRITE_BYTE, sleep disabled");
+ return NULL;
+ }
+
+ gpio = devm_gpiod_get_optional(&client->dev, "wakeup", GPIOD_IN);
+
+ if (IS_ERR(gpio)) {
+ dev_warn(&client->dev,
+ "gpio acquisition failed with error %ld, sleep disabled",
+ PTR_ERR(gpio));
+ return NULL;
+ } else if (!gpio) {
+ dev_info(&client->dev,
+ "wakeup-gpio not found, sleep disabled");
+ }
+
+ return gpio;
+}
+#else
+static inline int mlx90614_sleep(struct mlx90614_data *data)
+{
+ return -ENOSYS;
+}
+static inline int mlx90614_wakeup(struct mlx90614_data *data)
+{
+ return -ENOSYS;
+}
+static inline struct gpio_desc *mlx90614_probe_wakeup(struct i2c_client *client)
+{
+ return NULL;
+}
+#endif
+
+/* Return 0 for single sensor, 1 for dual sensor, <0 on error. */
+static int mlx90614_probe_num_ir_sensors(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct mlx90614_data *data = iio_priv(indio_dev);
+ const struct mlx_chip_info *chip_info = data->chip_info;
+ s32 ret;
+
+ if (chip_info->dual_channel)
+ return 0;
+
+ ret = i2c_smbus_read_word_data(client, chip_info->op_eeprom_config1);
+
+ if (ret < 0)
+ return ret;
+
+ return (ret & MLX90614_CONFIG_DUAL_MASK) ? 1 : 0;
+}
+
+static int mlx90614_probe(struct i2c_client *client)
+{
+ const struct i2c_device_id *id = i2c_client_get_device_id(client);
+ struct iio_dev *indio_dev;
+ struct mlx90614_data *data;
+ int ret;
+
+ if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA))
+ return -EOPNOTSUPP;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ data = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+ data->client = client;
+ mutex_init(&data->lock);
+ data->wakeup_gpio = mlx90614_probe_wakeup(client);
+ data->chip_info = device_get_match_data(&client->dev);
+
+ mlx90614_wakeup(data);
+
+ indio_dev->name = id->name;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->info = &mlx90614_info;
+
+ ret = mlx90614_probe_num_ir_sensors(client);
+ switch (ret) {
+ case 0:
+ dev_dbg(&client->dev, "Found single sensor");
+ indio_dev->channels = mlx90614_channels;
+ indio_dev->num_channels = 2;
+ break;
+ case 1:
+ dev_dbg(&client->dev, "Found dual sensor");
+ indio_dev->channels = mlx90614_channels;
+ indio_dev->num_channels = 3;
+ break;
+ default:
+ return ret;
+ }
+
+ if (data->wakeup_gpio) {
+ pm_runtime_set_autosuspend_delay(&client->dev,
+ MLX90614_AUTOSLEEP_DELAY);
+ pm_runtime_use_autosuspend(&client->dev);
+ pm_runtime_set_active(&client->dev);
+ pm_runtime_enable(&client->dev);
+ }
+
+ return iio_device_register(indio_dev);
+}
+
+static void mlx90614_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct mlx90614_data *data = iio_priv(indio_dev);
+
+ iio_device_unregister(indio_dev);
+
+ if (data->wakeup_gpio) {
+ pm_runtime_disable(&client->dev);
+ if (!pm_runtime_status_suspended(&client->dev))
+ mlx90614_sleep(data);
+ pm_runtime_set_suspended(&client->dev);
+ }
+}
+
+static const struct mlx_chip_info mlx90614_chip_info = {
+ .op_eeprom_emissivity = MLX90614_OP_EEPROM | 0x04,
+ .op_eeprom_config1 = MLX90614_OP_EEPROM | 0x05,
+ .op_ram_ta = MLX90614_OP_RAM | 0x06,
+ .op_ram_tobj1 = MLX90614_OP_RAM | 0x07,
+ .op_ram_tobj2 = MLX90614_OP_RAM | 0x08,
+ .op_sleep = MLX90614_OP_SLEEP,
+ .dual_channel = true,
+ .wakeup_delay_ms = MLX90614_TIMING_WAKEUP,
+ .emissivity_max = 65535,
+ .fir_config_mask = MLX90614_CONFIG_FIR_MASK,
+ .iir_config_mask = MLX90614_CONFIG_IIR_MASK,
+ .iir_valid_offset = 0,
+ .iir_values = { 77, 31, 20, 15, 723, 153, 110, 86 },
+ .iir_freqs = {
+ { 0, 150000 }, /* 13% ~= 0.15 Hz */
+ { 0, 200000 }, /* 17% ~= 0.20 Hz */
+ { 0, 310000 }, /* 25% ~= 0.31 Hz */
+ { 0, 770000 }, /* 50% ~= 0.77 Hz */
+ { 0, 860000 }, /* 57% ~= 0.86 Hz */
+ { 1, 100000 }, /* 67% ~= 1.10 Hz */
+ { 1, 530000 }, /* 80% ~= 1.53 Hz */
+ { 7, 230000 } /* 100% ~= 7.23 Hz */
+ },
+};
+
+static const struct mlx_chip_info mlx90615_chip_info = {
+ .op_eeprom_emissivity = MLX90615_OP_EEPROM | 0x03,
+ .op_eeprom_config1 = MLX90615_OP_EEPROM | 0x02,
+ .op_ram_ta = MLX90615_OP_RAM | 0x06,
+ .op_ram_tobj1 = MLX90615_OP_RAM | 0x07,
+ .op_ram_tobj2 = MLX90615_OP_RAM | 0x08,
+ .op_sleep = MLX90615_OP_SLEEP,
+ .dual_channel = false,
+ .wakeup_delay_ms = MLX90615_TIMING_WAKEUP,
+ .emissivity_max = 16383,
+ .fir_config_mask = 0, /* MLX90615 FIR is fixed */
+ .iir_config_mask = MLX90615_CONFIG_IIR_MASK,
+ /* IIR value 0 is FORBIDDEN COMBINATION on MLX90615 */
+ .iir_valid_offset = 1,
+ .iir_values = { 500, 50, 30, 20, 15, 13, 10 },
+ .iir_freqs = {
+ { 0, 100000 }, /* 14% ~= 0.10 Hz */
+ { 0, 130000 }, /* 17% ~= 0.13 Hz */
+ { 0, 150000 }, /* 20% ~= 0.15 Hz */
+ { 0, 200000 }, /* 25% ~= 0.20 Hz */
+ { 0, 300000 }, /* 33% ~= 0.30 Hz */
+ { 0, 500000 }, /* 50% ~= 0.50 Hz */
+ { 5, 000000 }, /* 100% ~= 5.00 Hz */
+ },
+};
+
+static const struct i2c_device_id mlx90614_id[] = {
+ { "mlx90614", .driver_data = (kernel_ulong_t)&mlx90614_chip_info },
+ { "mlx90615", .driver_data = (kernel_ulong_t)&mlx90615_chip_info },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, mlx90614_id);
+
+static const struct of_device_id mlx90614_of_match[] = {
+ { .compatible = "melexis,mlx90614", .data = &mlx90614_chip_info },
+ { .compatible = "melexis,mlx90615", .data = &mlx90615_chip_info },
+ { }
+};
+MODULE_DEVICE_TABLE(of, mlx90614_of_match);
+
+static int mlx90614_pm_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct mlx90614_data *data = iio_priv(indio_dev);
+
+ if (data->wakeup_gpio && pm_runtime_active(dev))
+ return mlx90614_sleep(data);
+
+ return 0;
+}
+
+static int mlx90614_pm_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct mlx90614_data *data = iio_priv(indio_dev);
+ int err;
+
+ if (data->wakeup_gpio) {
+ err = mlx90614_wakeup(data);
+ if (err < 0)
+ return err;
+
+ pm_runtime_disable(dev);
+ pm_runtime_set_active(dev);
+ pm_runtime_enable(dev);
+ }
+
+ return 0;
+}
+
+static int mlx90614_pm_runtime_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct mlx90614_data *data = iio_priv(indio_dev);
+
+ return mlx90614_sleep(data);
+}
+
+static int mlx90614_pm_runtime_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct mlx90614_data *data = iio_priv(indio_dev);
+
+ return mlx90614_wakeup(data);
+}
+
+static const struct dev_pm_ops mlx90614_pm_ops = {
+ SYSTEM_SLEEP_PM_OPS(mlx90614_pm_suspend, mlx90614_pm_resume)
+ RUNTIME_PM_OPS(mlx90614_pm_runtime_suspend,
+ mlx90614_pm_runtime_resume, NULL)
+};
+
+static struct i2c_driver mlx90614_driver = {
+ .driver = {
+ .name = "mlx90614",
+ .of_match_table = mlx90614_of_match,
+ .pm = pm_ptr(&mlx90614_pm_ops),
+ },
+ .probe = mlx90614_probe,
+ .remove = mlx90614_remove,
+ .id_table = mlx90614_id,
+};
+module_i2c_driver(mlx90614_driver);
+
+MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
+MODULE_AUTHOR("Vianney le Clément de Saint-Marcq <vianney.leclement@essensium.com>");
+MODULE_AUTHOR("Crt Mori <cmo@melexis.com>");
+MODULE_DESCRIPTION("Melexis MLX90614 contactless IR temperature sensor driver");
+MODULE_LICENSE("GPL");