On Sun, Jan 08, 2017 at 10:56:14AM +0000, Jonathan Cameron wrote: > On 06/01/17 02:50, Mani Sadhasivam wrote: > > This patch adds support for TI TMP007 - 16 bit IR thermopile sensor with integrated Math engine. > > Sensor takes care of calculating the object temperature with the help of calibrated constants stored in non-volatile memory, > > thereby reducing the calculation overhead. > > > > Signed-off-by: Manivannan Sadhasivam <manivannanece23@xxxxxxxxx> > Pretty good. A few minor comments inline. It 'might' be worth using > regmap for this part to avoid hand rolling masked partial register writes > and caching of register values. Perhaps it's not worth it for such a > simple interface however. > > Jonathan Thanks Jonathan for your review. > > --- > > > > Changes in v3 (based on suggestions from Peter): > > > > 1. Added data validity check for TObj > > 2. Modified the comment style > > 3. Added powerdown function > > 4. Some code cleanups > > > > .../devicetree/bindings/iio/temperature/tmp007.txt | 16 + > > drivers/iio/temperature/Kconfig | 10 + > > drivers/iio/temperature/Makefile | 1 + > > drivers/iio/temperature/tmp007.c | 345 +++++++++++++++++++++ > > 4 files changed, 372 insertions(+) > > create mode 100644 Documentation/devicetree/bindings/iio/temperature/tmp007.txt > > create mode 100644 drivers/iio/temperature/tmp007.c > > > > diff --git a/Documentation/devicetree/bindings/iio/temperature/tmp007.txt b/Documentation/devicetree/bindings/iio/temperature/tmp007.txt > > new file mode 100644 > > index 0000000..9ae0519 > > --- /dev/null > > +++ b/Documentation/devicetree/bindings/iio/temperature/tmp007.txt > > @@ -0,0 +1,16 @@ > > +* TI TMP007 - IR thermopile sensor with integrated math engine > > + > > +Link to datasheet: http://www.ti.com/lit/ds/symlink/tmp007.pdf > > + > > +Required properties: > > + > > + - compatible: should be "ti,tmp007" > > + - reg: the I2C address of the sensor (changeable via ADR pins) > Perhaps list the options that are possible? ACK. > > + > > +Example: > > + > > +tmp007@40 { > > + compatible = "ti,tmp007"; > > + reg = <0x40>; > > +}; > > + > > diff --git a/drivers/iio/temperature/Kconfig b/drivers/iio/temperature/Kconfig > > index c4664e5..538ce9e 100644 > > --- a/drivers/iio/temperature/Kconfig > > +++ b/drivers/iio/temperature/Kconfig > > @@ -23,6 +23,16 @@ config TMP006 > > This driver can also be built as a module. If so, the module will > > be called tmp006. > > > > +config TMP007 > > + tristate "TMP007 infrared thermopile sensor with Integrated Math Engine" > > + depends on I2C > > + help > > + If you say yes here you get support for the Texas Instruments > > + TMP007 infrared thermopile sensor with Integrated Math Engine. > > + > > + This driver can also be built as a module. If so, the module will > > + be called tmp007. > > + > > config TSYS01 > > tristate "Measurement Specialties TSYS01 temperature sensor using I2C bus connection" > > depends on I2C > > diff --git a/drivers/iio/temperature/Makefile b/drivers/iio/temperature/Makefile > > index 02bc79d..f0cf5c5 100644 > > --- a/drivers/iio/temperature/Makefile > > +++ b/drivers/iio/temperature/Makefile > > @@ -4,5 +4,6 @@ > > > > obj-$(CONFIG_MLX90614) += mlx90614.o > > obj-$(CONFIG_TMP006) += tmp006.o > > +obj-$(CONFIG_TMP007) += tmp007.o > > obj-$(CONFIG_TSYS01) += tsys01.o > > obj-$(CONFIG_TSYS02D) += tsys02d.o > > diff --git a/drivers/iio/temperature/tmp007.c b/drivers/iio/temperature/tmp007.c > > new file mode 100644 > > index 0000000..a385ef5 > > --- /dev/null > > +++ b/drivers/iio/temperature/tmp007.c > > @@ -0,0 +1,345 @@ > > +/* > > + * tmp007.c - Support for TI TMP007 IR thermopile sensor with integrated math engine > > + * > > + * Copyright (c) 2017 Manivannan Sadhasivam <manivannanece23@xxxxxxxxx> > > + * > > + * 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 > > + * directory of this archive for more details. > > + * > > + * Driver for the Texas Instruments I2C 16-bit IR thermopile sensor > > + * > > + * (7-bit I2C slave address (0x40 - 0x47), changeable via ADR pins) > > + * > > + * Note: This driver assumes that the sensor has been calibrated beforehand > > + * > > + * TODO: ALERT irq, limit threshold events > > + * > > + */ > > + > > +#include <linux/err.h> > > +#include <linux/i2c.h> > > +#include <linux/delay.h> > > +#include <linux/module.h> > > +#include <linux/pm.h> > > +#include <linux/bitops.h> > > +#include <linux/of.h> > > + > > +#include <linux/iio/iio.h> > > +#include <linux/iio/sysfs.h> > > + > > +#define TMP007_TDIE 0x01 > > +#define TMP007_CONFIG 0x02 > > +#define TMP007_TOBJECT 0x03 > > +#define TMP007_STATUS 0x04 > > +#define TMP007_STATUS_MASK 0x05 > > +#define TMP007_MANUFACTURER_ID 0x1e > > +#define TMP007_DEVICE_ID 0x1f > > + > > +#define TMP007_CONFIG_CONV_EN BIT(12) > > +#define TMP007_CONFIG_COMP_EN BIT(5) > > +#define TMP007_CONFIG_TC_EN BIT(6) > > +#define TMP007_CONFIG_CR_MASK GENMASK(11, 9) > > +#define TMP007_CONFIG_CR_SHIFT 9 > > + > > +#define TMP007_STATUS_CONV_READY BIT(14) > > +#define TMP007_STATUS_DATA_VALID BIT(9) > > + > > +#define TMP007_MANUFACTURER_MAGIC 0x5449 > > +#define TMP007_DEVICE_MAGIC 0x0078 > > + > > +#define TMP007_TEMP_SHIFT 2 > > + > > +struct tmp007_data { > > + struct i2c_client *client; > > The fact you are caching values here and that everything is register > based suggests to me that it might make sense to use regmap and take > advantage of it's built in caching and masked write functions. > > If you pefer to stick to direct smbus calls that is fine. I'd prefer to use smbus calls over regmap here. As the usage is quite less and I don't think it'll be needed for such simple interface. > > > + u16 config; > > > + u16 status_mask; > Why cache this register? It is directly read then written > whenever used. ACK. > > > +}; > > + > > +static const int tmp007_avgs[5][2] = { {4, 0}, {2, 0}, {1, 0}, > > + {0, 500000}, {0, 250000} }; > > + > > +static int tmp007_read_temperature(struct tmp007_data *data, u8 reg) > > +{ > > + s32 ret; > > + int tries = 50; > > + > > + while (tries-- > 0) { > > + ret = i2c_smbus_read_word_swapped(data->client, > > + TMP007_STATUS); > > + if (ret < 0) > > + return ret; > > + if ((ret & TMP007_STATUS_CONV_READY) && > > + !(ret & TMP007_STATUS_DATA_VALID)) > > + break; > > + msleep(100); > > + } > > + > > + if (tries < 0) > > + return -EIO; > > + > > + return i2c_smbus_read_word_swapped(data->client, reg); > > +} > > + > > +static int tmp007_powerdown(struct tmp007_data *data) > > +{ > > + return i2c_smbus_write_word_swapped(data->client, TMP007_CONFIG, > > + data->config & ~TMP007_CONFIG_CONV_EN); > > +} > > + > > +static int tmp007_read_raw(struct iio_dev *indio_dev, > > + struct iio_chan_spec const *channel, int *val, > > + int *val2, long mask) > > +{ > > + struct tmp007_data *data = iio_priv(indio_dev); > > + s32 ret; > > + int conv_rate; > > + > > + switch (mask) { > > + case IIO_CHAN_INFO_RAW: > > + switch (channel->channel2) { > > + case IIO_MOD_TEMP_AMBIENT: /* LSB: 0.03125 degree Celsius */ > > + ret = i2c_smbus_read_word_swapped(data->client, TMP007_TDIE); > > + if (ret < 0) > > + return ret; > > + break; > > + case IIO_MOD_TEMP_OBJECT: > > + ret = tmp007_read_temperature(data, TMP007_TOBJECT); > > + if (ret < 0) > > + return ret; > > + break; > > + default: > > + return -EINVAL; > > + } > > + > > + *val = sign_extend32(ret, 15) >> TMP007_TEMP_SHIFT; > > + > > + return IIO_VAL_INT; > > + case IIO_CHAN_INFO_SCALE: > > + *val = 31; > > + *val2 = 250000; > > + > > + return IIO_VAL_INT_PLUS_MICRO; > > + case IIO_CHAN_INFO_SAMP_FREQ: > > + conv_rate = (data->config & TMP007_CONFIG_CR_MASK) > > + >> TMP007_CONFIG_CR_SHIFT; > > + *val = tmp007_avgs[conv_rate][0]; > > + *val2 = tmp007_avgs[conv_rate][1]; > > + > > + return IIO_VAL_INT_PLUS_MICRO; > > + default: > > + return -EINVAL; > > + } > > +} > > + > > +static int tmp007_write_raw(struct iio_dev *indio_dev, > > + struct iio_chan_spec const *channel, int val, > > + int val2, long mask) > > +{ > > + struct tmp007_data *data = iio_priv(indio_dev); > > + int i; > > + u16 tmp; > > + > > + if (mask == IIO_CHAN_INFO_SAMP_FREQ) { > > + for (i = 0; i < ARRAY_SIZE(tmp007_avgs); i++) { > > + if ((val == tmp007_avgs[i][0]) && > > + (val2 == tmp007_avgs[i][1])) { > > + tmp = data->config & ~TMP007_CONFIG_CR_MASK; > > + tmp |= (i << TMP007_CONFIG_CR_SHIFT); > > + > > + return i2c_smbus_write_word_swapped(data->client, > > + TMP007_CONFIG, > > + data->config = tmp); > > + } > > + } > > + } > > + > > + return -EINVAL; > > +} > > + > > +static IIO_CONST_ATTR(sampling_frequency_available, "4 2 1 0.5 0.25"); > > + > > +static struct attribute *tmp007_attributes[] = { > > + &iio_const_attr_sampling_frequency_available.dev_attr.attr, > > + NULL > > +}; > > + > > +static const struct attribute_group tmp007_attribute_group = { > > + .attrs = tmp007_attributes, > > +}; > > + > > +static const struct iio_chan_spec tmp007_channels[] = { > > + { > > + .type = IIO_TEMP, > > + .modified = 1, > > + .channel2 = IIO_MOD_TEMP_AMBIENT, > > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | > > + BIT(IIO_CHAN_INFO_SCALE), > > + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), > > + }, > > + { > > + .type = IIO_TEMP, > > + .modified = 1, > > + .channel2 = IIO_MOD_TEMP_OBJECT, > > + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | > > + BIT(IIO_CHAN_INFO_SCALE), > > + .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), > > + } > > +}; > > + > > +static const struct iio_info tmp007_info = { > > + .read_raw = tmp007_read_raw, > > + .write_raw = tmp007_write_raw, > > + .attrs = &tmp007_attribute_group, > > + .driver_module = THIS_MODULE, > > +}; > > + > > +static bool tmp007_identify(struct i2c_client *client) > > +{ > > + int manf_id, dev_id; > > + > > + manf_id = i2c_smbus_read_word_swapped(client, TMP007_MANUFACTURER_ID); > > + if (manf_id < 0) > > + return false; > > + > > + dev_id = i2c_smbus_read_word_swapped(client, TMP007_DEVICE_ID); > > + if (dev_id < 0) > > + return false; > > + > > + return (manf_id == TMP007_MANUFACTURER_MAGIC && dev_id == TMP007_DEVICE_MAGIC); > > +} > > + > > +static int tmp007_probe(struct i2c_client *client, > > + const struct i2c_device_id *tmp007_id) > > +{ > > + struct tmp007_data *data; > > + struct iio_dev *indio_dev; > > + int ret; > > + > > + if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA)) > > + return -EOPNOTSUPP; > > + > > + if (!tmp007_identify(client)) { > > + dev_err(&client->dev, "TMP007 not found\n"); > > + return -ENODEV; > > + } > > + > > + 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; > > + > > + indio_dev->dev.parent = &client->dev; > > + indio_dev->name = dev_name(&client->dev); > > + indio_dev->modes = INDIO_DIRECT_MODE; > > + indio_dev->info = &tmp007_info; > > + > > + indio_dev->channels = tmp007_channels; > > + indio_dev->num_channels = ARRAY_SIZE(tmp007_channels); > > + > > + /* > > + * Set Configuration register: > > + * 1. Conversion ON > > + * 2. Comparator mode > > + * 3. Transient correction enable > > + */ > > + > > + ret = i2c_smbus_read_word_swapped(data->client, TMP007_CONFIG); > > + if (ret < 0) > > + return ret; > > + > > + data->config = ret; > > + data->config |= (TMP007_CONFIG_CONV_EN | TMP007_CONFIG_COMP_EN | TMP007_CONFIG_TC_EN); > > + > > + ret = i2c_smbus_write_word_swapped(data->client, TMP007_CONFIG, > > + data->config); > > + if (ret < 0) > > + return ret; > > + > > + /* > > + * Set Status Mask register: > > + * 1. Conversion ready enable > 2. Data valid? ACK. > > + */ > > + > > + ret = i2c_smbus_read_word_swapped(data->client, TMP007_STATUS_MASK); > > + if (ret < 0) > > + goto error_powerdown; > > + > > + data->status_mask = ret; > > + data->status_mask |= (TMP007_STATUS_CONV_READY | TMP007_STATUS_DATA_VALID); > > + > > + ret = i2c_smbus_write_word_swapped(data->client, TMP007_STATUS_MASK, > > + data->status_mask); > > + if (ret < 0) > > + goto error_powerdown; > > + > > + return iio_device_register(indio_dev); > > + > > +error_powerdown: > > + tmp007_powerdown(data); > > + > > + return ret; > > +} > > + > > +static int tmp007_remove(struct i2c_client *client) > > +{ > > + struct iio_dev *indio_dev = i2c_get_clientdata(client); > > + struct tmp007_data *data = iio_priv(indio_dev); > > + > > + iio_device_unregister(indio_dev); > > + tmp007_powerdown(data); > > + > > + return 0; > > +} > > + > > +#ifdef CONFIG_PM_SLEEP > > +static int tmp007_suspend(struct device *dev) > > +{ > > + 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 = of_match_ptr(tmp007_of_match), > > + .pm = &tmp007_pm_ops, > > + }, > > + .probe = tmp007_probe, > > + .remove = tmp007_remove, > > + .id_table = tmp007_id, > > +}; > > +module_i2c_driver(tmp007_driver); > > + > > +MODULE_AUTHOR("Manivannan Sadhasivam <manivannanece23@xxxxxxxxx>"); > > +MODULE_DESCRIPTION("TI TMP007 IR thermopile sensor driver"); > > +MODULE_LICENSE("GPL"); > > > -- To unsubscribe from this list: send the line "unsubscribe linux-iio" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
