iio: humidity: add support to hts221 rh/temp combo device
Add support to STM HTS221 humidity + temperature sensor
http://www.st.com/resource/en/datasheet/hts221.pdf
- continuous mode support
- i2c support
- spi support
- trigger mode support
Signed-off-by: Lorenzo Bianconi <lorenzo.bianconi@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
diff --git a/drivers/iio/humidity/hts221.h b/drivers/iio/humidity/hts221.h
new file mode 100644
index 0000000..c715466
--- /dev/null
+++ b/drivers/iio/humidity/hts221.h
@@ -0,0 +1,73 @@
+/*
+ * STMicroelectronics hts221 sensor driver
+ *
+ * Copyright 2016 STMicroelectronics Inc.
+ *
+ * Lorenzo Bianconi <lorenzo.bianconi@st.com>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#ifndef HTS221_H
+#define HTS221_H
+
+#define HTS221_DEV_NAME "hts221"
+
+#include <linux/iio/iio.h>
+
+#define HTS221_RX_MAX_LENGTH 8
+#define HTS221_TX_MAX_LENGTH 8
+
+#define HTS221_DATA_SIZE 2
+
+struct hts221_transfer_buffer {
+ u8 rx_buf[HTS221_RX_MAX_LENGTH];
+ u8 tx_buf[HTS221_TX_MAX_LENGTH] ____cacheline_aligned;
+};
+
+struct hts221_transfer_function {
+ int (*read)(struct device *dev, u8 addr, int len, u8 *data);
+ int (*write)(struct device *dev, u8 addr, int len, u8 *data);
+};
+
+#define HTS221_AVG_DEPTH 8
+struct hts221_avg_avl {
+ u16 avg;
+ u8 val;
+};
+
+enum hts221_sensor_type {
+ HTS221_SENSOR_H,
+ HTS221_SENSOR_T,
+ HTS221_SENSOR_MAX,
+};
+
+struct hts221_sensor {
+ u8 cur_avg_idx;
+ int slope, b_gen;
+};
+
+struct hts221_hw {
+ const char *name;
+ struct device *dev;
+
+ struct mutex lock;
+ struct iio_trigger *trig;
+ int irq;
+
+ struct hts221_sensor sensors[HTS221_SENSOR_MAX];
+
+ u8 odr;
+
+ const struct hts221_transfer_function *tf;
+ struct hts221_transfer_buffer tb;
+};
+
+int hts221_config_drdy(struct hts221_hw *hw, bool enable);
+int hts221_probe(struct iio_dev *iio_dev);
+int hts221_power_on(struct hts221_hw *hw);
+int hts221_power_off(struct hts221_hw *hw);
+int hts221_allocate_buffers(struct hts221_hw *hw);
+int hts221_allocate_trigger(struct hts221_hw *hw);
+
+#endif /* HTS221_H */