diff options
Diffstat (limited to 'drivers/iio/temperature/mlx90614.c')
| -rw-r--r-- | drivers/iio/temperature/mlx90614.c | 787 |
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"); |