iio:st_pressure:initial lps22hb sensor support

Initial support for ST LPS22HB pressure sensor. Datasheet:
http://www2.st.com/resource/en/datasheet/lps22hb.pdf

Features:
* pressure data and timestamping channels
* sampling frequency selection
* interrupt based trigger
* over I2C or SPI

Signed-off-by: Gregor Boirie <gregor.boirie@parrot.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

5 files changed, 96 insertions, 5 deletions

diff --git a/drivers/iio/pressure/Kconfig b/drivers/iio/pressure/Kconfig
index 9125a9382b3e..8d654f671b6b 100644
--- a/drivers/iio/pressure/Kconfig
+++ b/drivers/iio/pressure/Kconfig
@@ -131,7 +131,7 @@ config IIO_ST_PRESS
         select IIO_TRIGGERED_BUFFER if (IIO_BUFFER)
         help
           Say yes here to build support for STMicroelectronics pressure
-          sensors: LPS001WP, LPS25H, LPS331AP.
+          sensors: LPS001WP, LPS25H, LPS331AP, LPS22HB.
 
           This driver can also be built as a module. If so, these modules
           will be created:
diff --git a/drivers/iio/pressure/st_pressure.h b/drivers/iio/pressure/st_pressure.h
index f5f41490060b..903a21e46874 100644
--- a/drivers/iio/pressure/st_pressure.h
+++ b/drivers/iio/pressure/st_pressure.h
@@ -17,6 +17,7 @@
 #define LPS001WP_PRESS_DEV_NAME         "lps001wp"
 #define LPS25H_PRESS_DEV_NAME           "lps25h"
 #define LPS331AP_PRESS_DEV_NAME         "lps331ap"
+#define LPS22HB_PRESS_DEV_NAME          "lps22hb"
 
 /**
  * struct st_sensors_platform_data - default press platform data
diff --git a/drivers/iio/pressure/st_pressure_core.c b/drivers/iio/pressure/st_pressure_core.c
index 9e9b72a8f18f..c0ff3bf071d8 100644
--- a/drivers/iio/pressure/st_pressure_core.c
+++ b/drivers/iio/pressure/st_pressure_core.c
@@ -113,6 +113,26 @@
 #define ST_PRESS_LPS25H_OUT_XL_ADDR             0x28
 #define ST_TEMP_LPS25H_OUT_L_ADDR               0x2b
 
+/* CUSTOM VALUES FOR LPS22HB SENSOR */
+#define ST_PRESS_LPS22HB_WAI_EXP                0xb1
+#define ST_PRESS_LPS22HB_ODR_ADDR               0x10
+#define ST_PRESS_LPS22HB_ODR_MASK               0x70
+#define ST_PRESS_LPS22HB_ODR_AVL_1HZ_VAL        0x01
+#define ST_PRESS_LPS22HB_ODR_AVL_10HZ_VAL       0x02
+#define ST_PRESS_LPS22HB_ODR_AVL_25HZ_VAL       0x03
+#define ST_PRESS_LPS22HB_ODR_AVL_50HZ_VAL       0x04
+#define ST_PRESS_LPS22HB_ODR_AVL_75HZ_VAL       0x05
+#define ST_PRESS_LPS22HB_PW_ADDR                0x10
+#define ST_PRESS_LPS22HB_PW_MASK                0x70
+#define ST_PRESS_LPS22HB_BDU_ADDR               0x10
+#define ST_PRESS_LPS22HB_BDU_MASK               0x02
+#define ST_PRESS_LPS22HB_DRDY_IRQ_ADDR          0x12
+#define ST_PRESS_LPS22HB_DRDY_IRQ_INT1_MASK     0x04
+#define ST_PRESS_LPS22HB_DRDY_IRQ_INT2_MASK     0x08
+#define ST_PRESS_LPS22HB_IHL_IRQ_ADDR           0x12
+#define ST_PRESS_LPS22HB_IHL_IRQ_MASK           0x80
+#define ST_PRESS_LPS22HB_MULTIREAD_BIT          true
+
 static const struct iio_chan_spec st_press_1_channels[] = {
         {
                 .type = IIO_PRESSURE,
@@ -183,6 +203,27 @@ static const struct iio_chan_spec st_press_lps001wp_channels[] = {
         IIO_CHAN_SOFT_TIMESTAMP(1)
 };
 
+static const struct iio_chan_spec st_press_lps22hb_channels[] = {
+        {
+                .type = IIO_PRESSURE,
+                .channel2 = IIO_NO_MOD,
+                .address = ST_PRESS_1_OUT_XL_ADDR,
+                .scan_index = 0,
+                .scan_type = {
+                        .sign = 'u',
+                        .realbits = 24,
+                        .storagebits = 24,
+                        .endianness = IIO_LE,
+                },
+                .info_mask_separate =
+                        BIT(IIO_CHAN_INFO_RAW) |
+                        BIT(IIO_CHAN_INFO_SCALE),
+                .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
+                .modified = 0,
+        },
+        IIO_CHAN_SOFT_TIMESTAMP(1)
+};
+
 static const struct st_sensor_settings st_press_sensors_settings[] = {
         {
                 .wai = ST_PRESS_LPS331AP_WAI_EXP,
@@ -326,6 +367,51 @@ static const struct st_sensor_settings st_press_sensors_settings[] = {
                 .multi_read_bit = ST_PRESS_LPS25H_MULTIREAD_BIT,
                 .bootime = 2,
         },
+        {
+                .wai = ST_PRESS_LPS22HB_WAI_EXP,
+                .wai_addr = ST_SENSORS_DEFAULT_WAI_ADDRESS,
+                .sensors_supported = {
+                        [0] = LPS22HB_PRESS_DEV_NAME,
+                },
+                .ch = (struct iio_chan_spec *)st_press_lps22hb_channels,
+                .num_ch = ARRAY_SIZE(st_press_lps22hb_channels),
+                .odr = {
+                        .addr = ST_PRESS_LPS22HB_ODR_ADDR,
+                        .mask = ST_PRESS_LPS22HB_ODR_MASK,
+                        .odr_avl = {
+                                { 1, ST_PRESS_LPS22HB_ODR_AVL_1HZ_VAL, },
+                                { 10, ST_PRESS_LPS22HB_ODR_AVL_10HZ_VAL, },
+                                { 25, ST_PRESS_LPS22HB_ODR_AVL_25HZ_VAL, },
+                                { 50, ST_PRESS_LPS22HB_ODR_AVL_50HZ_VAL, },
+                                { 75, ST_PRESS_LPS22HB_ODR_AVL_75HZ_VAL, },
+                        },
+                },
+                .pw = {
+                        .addr = ST_PRESS_LPS22HB_PW_ADDR,
+                        .mask = ST_PRESS_LPS22HB_PW_MASK,
+                        .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
+                },
+                .fs = {
+                        .fs_avl = {
+                                [0] = {
+                                        .num = ST_PRESS_FS_AVL_1260MB,
+                                        .gain = ST_PRESS_KPASCAL_NANO_SCALE,
+                                },
+                        },
+                },
+                .bdu = {
+                        .addr = ST_PRESS_LPS22HB_BDU_ADDR,
+                        .mask = ST_PRESS_LPS22HB_BDU_MASK,
+                },
+                .drdy_irq = {
+                        .addr = ST_PRESS_LPS22HB_DRDY_IRQ_ADDR,
+                        .mask_int1 = ST_PRESS_LPS22HB_DRDY_IRQ_INT1_MASK,
+                        .mask_int2 = ST_PRESS_LPS22HB_DRDY_IRQ_INT2_MASK,
+                        .addr_ihl = ST_PRESS_LPS22HB_IHL_IRQ_ADDR,
+                        .mask_ihl = ST_PRESS_LPS22HB_IHL_IRQ_MASK,
+                },
+                .multi_read_bit = ST_PRESS_LPS22HB_MULTIREAD_BIT,
+        },
 };
 
 static int st_press_write_raw(struct iio_dev *indio_dev,
@@ -454,10 +540,9 @@ int st_press_common_probe(struct iio_dev *indio_dev)
         indio_dev->channels = press_data->sensor_settings->ch;
         indio_dev->num_channels = press_data->sensor_settings->num_ch;
 
-        if (press_data->sensor_settings->fs.addr != 0)
-                press_data->current_fullscale =
-                        (struct st_sensor_fullscale_avl *)
-                                &press_data->sensor_settings->fs.fs_avl[0];
+        press_data->current_fullscale =
+                (struct st_sensor_fullscale_avl *)
+                        &press_data->sensor_settings->fs.fs_avl[0];
 
         press_data->odr = press_data->sensor_settings->odr.odr_avl[0].hz;
 
diff --git a/drivers/iio/pressure/st_pressure_i2c.c b/drivers/iio/pressure/st_pressure_i2c.c
index 8fcf9766eaec..ed18701c68c9 100644
--- a/drivers/iio/pressure/st_pressure_i2c.c
+++ b/drivers/iio/pressure/st_pressure_i2c.c
@@ -32,6 +32,10 @@ static const struct of_device_id st_press_of_match[] = {
                 .compatible = "st,lps331ap-press",
                 .data = LPS331AP_PRESS_DEV_NAME,
         },
+        {
+                .compatible = "st,lps22hb-press",
+                .data = LPS22HB_PRESS_DEV_NAME,
+        },
         {},
 };
 MODULE_DEVICE_TABLE(of, st_press_of_match);
diff --git a/drivers/iio/pressure/st_pressure_spi.c b/drivers/iio/pressure/st_pressure_spi.c
index 40c0692ff1de..550508025af1 100644
--- a/drivers/iio/pressure/st_pressure_spi.c
+++ b/drivers/iio/pressure/st_pressure_spi.c
@@ -50,6 +50,7 @@ static const struct spi_device_id st_press_id_table[] = {
         { LPS001WP_PRESS_DEV_NAME },
         { LPS25H_PRESS_DEV_NAME },
         { LPS331AP_PRESS_DEV_NAME },
+        { LPS22HB_PRESS_DEV_NAME },
         {},
 };
 MODULE_DEVICE_TABLE(spi, st_press_id_table);