diff options
Diffstat (limited to 'drivers/iio/temperature/mlx90614.c')
| -rw-r--r-- | drivers/iio/temperature/mlx90614.c | 97 |
1 files changed, 84 insertions, 13 deletions
diff --git a/drivers/iio/temperature/mlx90614.c b/drivers/iio/temperature/mlx90614.c index c8b6ac8b2d69..a112fc9abf43 100644 --- a/drivers/iio/temperature/mlx90614.c +++ b/drivers/iio/temperature/mlx90614.c @@ -2,6 +2,7 @@ * mlx90614.c - Support for Melexis MLX90614 contactless IR temperature sensor * * Copyright (c) 2014 Peter Meerwald <pmeerw@pmeerw.net> + * Copyright (c) 2015 Essensium NV * * This file is subject to the terms and conditions of version 2 of * the GNU General Public License. See the file COPYING in the main @@ -20,11 +21,35 @@ #include <linux/iio/iio.h> -#define MLX90614_OP_RAM 0x00 +#define MLX90614_OP_RAM 0x00 +#define MLX90614_OP_EEPROM 0x20 +#define MLX90614_OP_SLEEP 0xff /* RAM offsets with 16-bit data, MSB first */ -#define MLX90614_TA 0x06 /* ambient temperature */ -#define MLX90614_TOBJ1 0x07 /* object temperature */ +#define MLX90614_RAW1 (MLX90614_OP_RAM | 0x04) /* raw data IR channel 1 */ +#define MLX90614_RAW2 (MLX90614_OP_RAM | 0x05) /* raw data IR channel 2 */ +#define MLX90614_TA (MLX90614_OP_RAM | 0x06) /* ambient temperature */ +#define MLX90614_TOBJ1 (MLX90614_OP_RAM | 0x07) /* object 1 temperature */ +#define MLX90614_TOBJ2 (MLX90614_OP_RAM | 0x08) /* object 2 temperature */ + +/* EEPROM offsets with 16-bit data, MSB first */ +#define MLX90614_EMISSIVITY (MLX90614_OP_EEPROM | 0x04) /* emissivity correction coefficient */ +#define MLX90614_CONFIG (MLX90614_OP_EEPROM | 0x05) /* configuration register */ + +/* 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 MLX90614_CONFIG_GAIN_SHIFT 11 /* gain */ +#define MLX90614_CONFIG_GAIN_MASK (0x7 << MLX90614_CONFIG_GAIN_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 */ struct mlx90614_data { struct i2c_client *client; @@ -35,26 +60,34 @@ static int mlx90614_read_raw(struct iio_dev *indio_dev, int *val2, long mask) { struct mlx90614_data *data = iio_priv(indio_dev); + u8 cmd; s32 ret; switch (mask) { case IIO_CHAN_INFO_RAW: /* 0.02K / LSB */ switch (channel->channel2) { case IIO_MOD_TEMP_AMBIENT: - ret = i2c_smbus_read_word_data(data->client, - MLX90614_OP_RAM | MLX90614_TA); - if (ret < 0) - return ret; + cmd = MLX90614_TA; break; case IIO_MOD_TEMP_OBJECT: - ret = i2c_smbus_read_word_data(data->client, - MLX90614_OP_RAM | MLX90614_TOBJ1); - if (ret < 0) - return ret; + switch (channel->channel) { + case 0: + cmd = MLX90614_TOBJ1; + break; + case 1: + cmd = MLX90614_TOBJ2; + break; + default: + return -EINVAL; + } break; default: return -EINVAL; } + + ret = i2c_smbus_read_word_data(data->client, cmd); + if (ret < 0) + return ret; *val = ret; return IIO_VAL_INT; case IIO_CHAN_INFO_OFFSET: @@ -86,6 +119,16 @@ static const struct iio_chan_spec mlx90614_channels[] = { .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), + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_OFFSET) | + BIT(IIO_CHAN_INFO_SCALE), + }, }; static const struct iio_info mlx90614_info = { @@ -93,11 +136,25 @@ static const struct iio_info mlx90614_info = { .driver_module = THIS_MODULE, }; +/* Return 0 for single sensor, 1 for dual sensor, <0 on error. */ +static int mlx90614_probe_num_ir_sensors(struct i2c_client *client) +{ + s32 ret; + + ret = i2c_smbus_read_word_data(client, MLX90614_CONFIG); + + 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) { struct iio_dev *indio_dev; struct mlx90614_data *data; + int ret; if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA)) return -ENODEV; @@ -115,8 +172,21 @@ static int mlx90614_probe(struct i2c_client *client, indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->info = &mlx90614_info; - indio_dev->channels = mlx90614_channels; - indio_dev->num_channels = ARRAY_SIZE(mlx90614_channels); + 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; + } return iio_device_register(indio_dev); } @@ -146,5 +216,6 @@ static struct i2c_driver mlx90614_driver = { 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_DESCRIPTION("Melexis MLX90614 contactless IR temperature sensor driver"); MODULE_LICENSE("GPL"); |