Add meas-spec sensors common part

Measurement specialties drivers common part.
These functions are used by further drivers
in the patchset: TSYS01, TSYS02D, HTU21, MS5637, MS8607
Signed-off-by: Ludovic Tancerel <ludovic.tancerel@maplehightech.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/common/Kconfig

@@ -3,5 +3,6 @@
 #
 
 source "drivers/iio/common/hid-sensors/Kconfig"
+source "drivers/iio/common/ms_sensors/Kconfig"
 source "drivers/iio/common/ssp_sensors/Kconfig"
 source "drivers/iio/common/st_sensors/Kconfig"

drivers/iio/common/Makefile

@@ -8,5 +8,6 @@
 
 # When adding new entries keep the list in alphabetical order
 obj-y += hid-sensors/
+obj-y += ms_sensors/
 obj-y += ssp_sensors/
 obj-y += st_sensors/

drivers/iio/common/ms_sensors/Kconfig

+#
+# Measurements Specialties sensors common library
+#
+
+config IIO_MS_SENSORS_I2C
+        tristate

drivers/iio/common/ms_sensors/Makefile

+#
+# Makefile for the Measurement Specialties sensor common modules.
+#
+
+obj-$(CONFIG_IIO_MS_SENSORS_I2C) += ms_sensors_i2c.o

drivers/iio/common/ms_sensors/ms_sensors_i2c.h

+/*
+ * Measurements Specialties common sensor driver
+ *
+ * Copyright (c) 2015 Measurement-Specialties
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef _MS_SENSORS_I2C_H
+#define _MS_SENSORS_I2C_H
+
+#include <linux/i2c.h>
+#include <linux/mutex.h>
+
+#define MS_SENSORS_TP_PROM_WORDS_NB		7
+
+/**
+ * struct ms_ht_dev - Humidity/Temperature sensor device structure
+ * @client:	i2c client
+ * @lock:	lock protecting the i2c conversion
+ * @res_index:	index to selected sensor resolution
+ */
+struct ms_ht_dev {
+	struct i2c_client *client;
+	struct mutex lock;
+	u8 res_index;
+};
+
+/**
+ * struct ms_tp_dev - Temperature/Pressure sensor device structure
+ * @client:	i2c client
+ * @lock:	lock protecting the i2c conversion
+ * @prom:	array of PROM coefficients used for conversion. Added element
+ *              for CRC computation
+ * @res_index:	index to selected sensor resolution
+ */
+struct ms_tp_dev {
+	struct i2c_client *client;
+	struct mutex lock;
+	u16 prom[MS_SENSORS_TP_PROM_WORDS_NB + 1];
+	u8 res_index;
+};
+
+int ms_sensors_reset(void *cli, u8 cmd, unsigned int delay);
+int ms_sensors_read_prom_word(void *cli, int cmd, u16 *word);
+int ms_sensors_convert_and_read(void *cli, u8 conv, u8 rd,
+				unsigned int delay, u32 *adc);
+int ms_sensors_read_serial(struct i2c_client *client, u64 *sn);
+ssize_t ms_sensors_show_serial(struct ms_ht_dev *dev_data, char *buf);
+ssize_t ms_sensors_write_resolution(struct ms_ht_dev *dev_data, u8 i);
+ssize_t ms_sensors_show_battery_low(struct ms_ht_dev *dev_data, char *buf);
+ssize_t ms_sensors_show_heater(struct ms_ht_dev *dev_data, char *buf);
+ssize_t ms_sensors_write_heater(struct ms_ht_dev *dev_data,
+				const char *buf, size_t len);
+int ms_sensors_ht_read_temperature(struct ms_ht_dev *dev_data,
+				   s32 *temperature);
+int ms_sensors_ht_read_humidity(struct ms_ht_dev *dev_data,
+				u32 *humidity);
+int ms_sensors_tp_read_prom(struct ms_tp_dev *dev_data);
+int ms_sensors_read_temp_and_pressure(struct ms_tp_dev *dev_data,
+				      int *temperature,
+				      unsigned int *pressure);
+
+#endif /* _MS_SENSORS_I2C_H */