Add ms5637 meas-spec driver support

Support for MS5637 temperature & pressure sensor

Signed-off-by: Ludovic Tancerel <ludovic.tancerel@maplehightech.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/pressure/Kconfig b/drivers/iio/pressure/Kconfig
index 4745179ff64b4b6afee6f237555dec5294e0fdf1..9282ec4319fcfae6c5bd1a862bff0b803959e536 100644 (file)
--- a/drivers/iio/pressure/Kconfig
+++ b/drivers/iio/pressure/Kconfig
@@ -79,6 +79,17 @@ config MS5611_SPI
          To compile this driver as a module, choose M here: the module will
          be called ms5611_spi.
 
+config MS5637
+       tristate "Measurement Specialties MS5637 pressure & temperature sensor"
+       depends on I2C
+        select IIO_MS_SENSORS_I2C
+       help
+         If you say yes here you get support for the Measurement Specialties
+         MS5637 pressure and temperature sensor.
+
+         This driver can also be built as a module. If so, the module will
+         be called ms5637.
+
 config IIO_ST_PRESS
        tristate "STMicroelectronics pressure sensor Driver"
        depends on (I2C || SPI_MASTER) && SYSFS

diff --git a/drivers/iio/pressure/Makefile b/drivers/iio/pressure/Makefile
index a4f98f8d90ed0c33d9023feb64d7fb8d5cddc389..46571c96823fce17c6eed8d3b9ef369371078eca 100644 (file)
--- a/drivers/iio/pressure/Makefile
+++ b/drivers/iio/pressure/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_MPL3115) += mpl3115.o
 obj-$(CONFIG_MS5611) += ms5611_core.o
 obj-$(CONFIG_MS5611_I2C) += ms5611_i2c.o
 obj-$(CONFIG_MS5611_SPI) += ms5611_spi.o
+obj-$(CONFIG_MS5637) += ms5637.o
 obj-$(CONFIG_IIO_ST_PRESS) += st_pressure.o
 st_pressure-y := st_pressure_core.o
 st_pressure-$(CONFIG_IIO_BUFFER) += st_pressure_buffer.o

diff --git a/drivers/iio/pressure/ms5637.c b/drivers/iio/pressure/ms5637.c
new file mode 100644 (file)
index 0000000..e3ad9d3
--- /dev/null
+++ b/drivers/iio/pressure/ms5637.c
@@ -0,0 +1,186 @@
+/*
+ * ms5637.c - Support for Measurement-Specialties ms5637
+ *            pressure & temperature sensor
+ *
+ * Copyright (c) 2015 Measurement-Specialties
+ *
+ * Licensed under the GPL-2.
+ *
+ * (7-bit I2C slave address 0x76)
+ *
+ * Datasheet:
+ *  http://www.meas-spec.com/downloads/MS5637-02BA03.pdf
+ */
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/stat.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/mutex.h>
+
+#include "../common/ms_sensors/ms_sensors_i2c.h"
+
+static const int ms5637_samp_freq[6] = { 960, 480, 240, 120, 60, 30 };
+/* String copy of the above const for readability purpose */
+static const char ms5637_show_samp_freq[] = "960 480 240 120 60 30";
+
+static int ms5637_read_raw(struct iio_dev *indio_dev,
+                          struct iio_chan_spec const *channel, int *val,
+                          int *val2, long mask)
+{
+       int ret;
+       int temperature;
+       unsigned int pressure;
+       struct ms_tp_dev *dev_data = iio_priv(indio_dev);
+
+       switch (mask) {
+       case IIO_CHAN_INFO_PROCESSED:
+               ret = ms_sensors_read_temp_and_pressure(dev_data,
+                                                       &temperature,
+                                                       &pressure);
+               if (ret)
+                       return ret;
+
+               switch (channel->type) {
+               case IIO_TEMP:  /* in milli °C */
+                       *val = temperature;
+
+                       return IIO_VAL_INT;
+               case IIO_PRESSURE:      /* in kPa */
+                       *val = pressure / 1000;
+                       *val2 = (pressure % 1000) * 1000;
+
+                       return IIO_VAL_INT_PLUS_MICRO;
+               default:
+                       return -EINVAL;
+               }
+       case IIO_CHAN_INFO_SAMP_FREQ:
+               *val = ms5637_samp_freq[dev_data->res_index];
+
+               return IIO_VAL_INT;
+       default:
+               return -EINVAL;
+       }
+}
+
+static int ms5637_write_raw(struct iio_dev *indio_dev,
+                           struct iio_chan_spec const *chan,
+                           int val, int val2, long mask)
+{
+       struct ms_tp_dev *dev_data = iio_priv(indio_dev);
+       int i;
+
+       switch (mask) {
+       case IIO_CHAN_INFO_SAMP_FREQ:
+               i = ARRAY_SIZE(ms5637_samp_freq);
+               while (i-- > 0)
+                       if (val == ms5637_samp_freq[i])
+                               break;
+               if (i < 0)
+                       return -EINVAL;
+               dev_data->res_index = i;
+
+               return 0;
+       default:
+               return -EINVAL;
+       }
+}
+
+static const struct iio_chan_spec ms5637_channels[] = {
+       {
+               .type = IIO_TEMP,
+               .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+               .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+       },
+       {
+               .type = IIO_PRESSURE,
+               .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+               .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+       }
+};
+
+static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(ms5637_show_samp_freq);
+
+static struct attribute *ms5637_attributes[] = {
+       &iio_const_attr_sampling_frequency_available.dev_attr.attr,
+       NULL,
+};
+
+static const struct attribute_group ms5637_attribute_group = {
+       .attrs = ms5637_attributes,
+};
+
+static const struct iio_info ms5637_info = {
+       .read_raw = ms5637_read_raw,
+       .write_raw = ms5637_write_raw,
+       .attrs = &ms5637_attribute_group,
+       .driver_module = THIS_MODULE,
+};
+
+static int ms5637_probe(struct i2c_client *client,
+                       const struct i2c_device_id *id)
+{
+       struct ms_tp_dev *dev_data;
+       struct iio_dev *indio_dev;
+       int ret;
+
+       if (!i2c_check_functionality(client->adapter,
+                                    I2C_FUNC_SMBUS_READ_WORD_DATA |
+                                    I2C_FUNC_SMBUS_WRITE_BYTE |
+                                    I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
+               dev_err(&client->dev,
+                       "Adapter does not support some i2c transaction\n");
+               return -ENODEV;
+       }
+
+       indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*dev_data));
+       if (!indio_dev)
+               return -ENOMEM;
+
+       dev_data = iio_priv(indio_dev);
+       dev_data->client = client;
+       dev_data->res_index = 5;
+       mutex_init(&dev_data->lock);
+
+       indio_dev->info = &ms5637_info;
+       indio_dev->name = id->name;
+       indio_dev->dev.parent = &client->dev;
+       indio_dev->modes = INDIO_DIRECT_MODE;
+       indio_dev->channels = ms5637_channels;
+       indio_dev->num_channels = ARRAY_SIZE(ms5637_channels);
+
+       i2c_set_clientdata(client, indio_dev);
+
+       ret = ms_sensors_reset(client, 0x1E, 3000);
+       if (ret)
+               return ret;
+
+       ret = ms_sensors_tp_read_prom(dev_data);
+       if (ret)
+               return ret;
+
+       return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static const struct i2c_device_id ms5637_id[] = {
+       {"ms5637", 0},
+       {}
+};
+
+static struct i2c_driver ms5637_driver = {
+       .probe = ms5637_probe,
+       .id_table = ms5637_id,
+       .driver = {
+                  .name = "ms5637"
+                  },
+};
+
+module_i2c_driver(ms5637_driver);
+
+MODULE_DESCRIPTION("Measurement-Specialties ms5637 temperature & pressure driver");
+MODULE_AUTHOR("William Markezana <william.markezana@meas-spec.com>");
+MODULE_AUTHOR("Ludovic Tancerel <ludovic.tancerel@maplehightech.com>");
+MODULE_LICENSE("GPL v2");