Re: STMicroelectronics accelerometers driver.

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Hi everybody,

I attach the new modified patch with corrections about DMA using SPI.
Best regards,

Denis




 From 1b3c4eb307c1083cafa3dba6f1777f8438f4a6ad Mon Sep 17 00:00:00 2001
From: Denis Ciocca <denis.ciocca@xxxxxx>
Date: Mon, 22 Oct 2012 11:17:27 +0200
Subject: [PATCH 3/3] iio:accel: Add STMicroelectronics accelerometers driver

This patch adds generic accelerometer driver for STMicroelectronics
accelerometers, currently it supports:
LSM303DLH, LSM303DLHC, LIS3DH, LSM330D, LSM330DL, LSM330DLC, LSM303D,
LSM9DS0, LIS331DLH, LSM303DL, LSM303DLM, LSM330

Signed-off-by: Denis Ciocca <denis.ciocca@xxxxxx>
---
  Documentation/ABI/testing/sysfs-bus-iio-accel-st |    7 +
  drivers/iio/accel/Kconfig                        |   37 +
  drivers/iio/accel/Makefile                       |    6 +
  drivers/iio/accel/st_accel_buffer.c              |  177 ++++
  drivers/iio/accel/st_accel_core.c                | 1171
++++++++++++++++++++++
  drivers/iio/accel/st_accel_i2c.c                 |  128 +++
  drivers/iio/accel/st_accel_spi.c                 |  182 ++++
  drivers/iio/accel/st_accel_trigger.c             |   83 ++
  include/linux/iio/accel/st_accel.h               |  102 ++
  9 files changed, 1893 insertions(+), 0 deletions(-)
  create mode 100644 Documentation/ABI/testing/sysfs-bus-iio-accel-st
  create mode 100644 drivers/iio/accel/st_accel_buffer.c
  create mode 100644 drivers/iio/accel/st_accel_core.c
  create mode 100644 drivers/iio/accel/st_accel_i2c.c
  create mode 100644 drivers/iio/accel/st_accel_spi.c
  create mode 100644 drivers/iio/accel/st_accel_trigger.c
  create mode 100644 include/linux/iio/accel/st_accel.h

diff --git a/Documentation/ABI/testing/sysfs-bus-iio-accel-st
b/Documentation/ABI/testing/sysfs-bus-iio-accel-st
new file mode 100644
index 0000000..f426c02
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-iio-accel-st
@@ -0,0 +1,7 @@
+What:          /sys/bus/iio/devices/iio:deviceX/powerdown
+KernelVersion: 3.7.0
+Contact:       linux-iio@xxxxxxxxxxxxxxx
+Description:
+               Reading returns either '1' or '0'.
+               '1' means that the device in question is off.
+               '0' means that the devices in question is on.
diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
index b2510c4..d65e66a 100644
--- a/drivers/iio/accel/Kconfig
+++ b/drivers/iio/accel/Kconfig
@@ -13,4 +13,41 @@ config HID_SENSOR_ACCEL_3D
          Say yes here to build support for the HID SENSOR
          accelerometers 3D.

+config ST_ACCEL_3AXIS
+       tristate "STMicroelectronics accelerometers 3-Axis Driver"
+       depends on (I2C || SPI) && SYSFS
+       help
+         Say yes here to build support for STMicroelectronics accelerometers:
+         LSM303DLH, LSM303DLHC, LIS3DH, LSM330D, LSM330DL, LSM330DLC, LSM303D,
+         LSM9DS0, LIS331DLH, LSM303DL, LSM303DLM, LSM330.
+
+         This driver can also be built as a module. If so, the module
+         will be called st_accel.
+
+config ST_ACCEL_3AXIS_I2C
+       tristate "support I2C bus connection"
+       depends on ST_ACCEL_3AXIS && I2C
+       help
+         Say yes here to build I2C support for STMicroelectronics accelerometers.
+
+         To compile this driver as a module, choose M here: the
+         module will be called st_accel_i2c.
+
+config ST_ACCEL_3AXIS_SPI
+       tristate "support SPI bus connection"
+       depends on ST_ACCEL_3AXIS && SPI_MASTER
+       help
+         Say yes here to build SPI support for STMicroelectronics accelerometers.
+
+         To compile this driver as a module, choose M here: the
+         module will be called st_accel_spi.
+
+config ST_ACCEL_3AXIS_TRIGGERED_BUFFER
+       tristate "support triggered buffer"
+       depends on ST_ACCEL_3AXIS
+       select IIO_TRIGGERED_BUFFER
+       select IIO_BUFFER
+       help
+         Default trigger and buffer for STMicroelectronics accelerometers driver.
+
  endmenu
diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
index 5bc6855..1541236 100644
--- a/drivers/iio/accel/Makefile
+++ b/drivers/iio/accel/Makefile
@@ -3,3 +3,9 @@
  #

  obj-$(CONFIG_HID_SENSOR_ACCEL_3D) += hid-sensor-accel-3d.o
+
+st_accel-y := st_accel_core.o
+obj-$(CONFIG_ST_ACCEL_3AXIS_I2C) += st_accel_i2c.o
+obj-$(CONFIG_ST_ACCEL_3AXIS_SPI) += st_accel_spi.o
+obj-$(CONFIG_ST_ACCEL_3AXIS_TRIGGERED_BUFFER) += st_accel_trigger.o
st_accel_buffer.o
+obj-$(CONFIG_ST_ACCEL_3AXIS) += st_accel.o
diff --git a/drivers/iio/accel/st_accel_buffer.c
b/drivers/iio/accel/st_accel_buffer.c
new file mode 100644
index 0000000..e8419be
--- /dev/null
+++ b/drivers/iio/accel/st_accel_buffer.c
@@ -0,0 +1,177 @@
+/*
+ * STMicroelectronics accelerometers driver
+ *
+ * Copyright 2012 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@xxxxxx>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/interrupt.h>
+#include <linux/byteorder/generic.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+
+#include <linux/iio/accel/st_accel.h>
+
+
+#define ST_ACCEL_ENABLE_ALL_CHANNELS           0x07
+
+static int st_accel_get_buffer_element(struct iio_dev *indio_dev, u8 *buf)
+{
+       int i, n, len;
+       u8 reg_addr[ST_ACCEL_NUMBER_DATA_CHANNELS];
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       for (i = 0; i < ST_ACCEL_NUMBER_DATA_CHANNELS; i++) {
+               if (test_bit(i, indio_dev->active_scan_mask)) {
+                       reg_addr[n] = indio_dev->channels[i].address;
+                       n++;
+               }
+       }
+       switch (n) {
+       case 1:
+               len = adata->read_multiple_byte(adata, reg_addr[0],
+                                       ST_ACCEL_BYTE_FOR_CHANNEL, buf);
+               break;
+       case 2:
+               if ((reg_addr[1] - reg_addr[0]) == ST_ACCEL_BYTE_FOR_CHANNEL) {
+                       len = adata->read_multiple_byte(adata, reg_addr[0],
+                                       ST_ACCEL_BYTE_FOR_CHANNEL*n,
+                                       buf);
+               } else {
+                       u8 rx_array[ST_ACCEL_BYTE_FOR_CHANNEL*
+                               ST_ACCEL_NUMBER_DATA_CHANNELS];
+                       len = adata->read_multiple_byte(adata, reg_addr[0],
+                               ST_ACCEL_BYTE_FOR_CHANNEL*
+                               ST_ACCEL_NUMBER_DATA_CHANNELS,
+                               rx_array);
+                       if (len < 0)
+                               goto read_data_channels_error;
+
+                       for (i = 0; i < n * ST_ACCEL_NUMBER_DATA_CHANNELS;
+                                                                       i++) {
+                               if (i < n)
+                                       buf[i] = rx_array[i];
+                               else
+                                       buf[i] = rx_array[n + i];
+                       }
+                       len = ST_ACCEL_BYTE_FOR_CHANNEL*n;
+               }
+               break;
+       case 3:
+               len = adata->read_multiple_byte(adata, reg_addr[0],
+                       ST_ACCEL_BYTE_FOR_CHANNEL*ST_ACCEL_NUMBER_DATA_CHANNELS,
+                       buf);
+               break;
+       default:
+               len = -EINVAL;
+               goto read_data_channels_error;
+       }
+       if (len != ST_ACCEL_BYTE_FOR_CHANNEL*n) {
+               len = -EIO;
+               goto read_data_channels_error;
+       }
+
+read_data_channels_error:
+       return len;
+}
+
+static irqreturn_t st_accel_trigger_handler(int irq, void *p)
+{
+       int len;
+       struct iio_poll_func *pf = p;
+       struct iio_dev *indio_dev = pf->indio_dev;
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       len = st_accel_get_buffer_element(indio_dev, adata->buffer_data);
+       if (len < 0)
+               goto st_accel_get_buffer_element_error;
+
+       if (indio_dev->scan_timestamp)
+               *(s64 *)((u8 *)adata->buffer_data +
+                               ALIGN(len, sizeof(s64))) = pf->timestamp;
+
+       iio_push_to_buffer(indio_dev->buffer, adata->buffer_data);
+
+st_accel_get_buffer_element_error:
+       iio_trigger_notify_done(indio_dev->trig);
+
+       return IRQ_HANDLED;
+}
+
+static int st_accel_buffer_postenable(struct iio_dev *indio_dev)
+{
+       int err, i;
+       u8 active_bit = 0x00;
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       adata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
+       if (adata->buffer_data == NULL) {
+               err = -ENOMEM;
+               goto allocate_memory_error;
+       }
+
+       for (i = 0; i < ST_ACCEL_NUMBER_DATA_CHANNELS; i++)
+               if (test_bit(i, indio_dev->active_scan_mask))
+                       active_bit |= (1 << i);
+
+       err = st_accel_set_axis_enable(indio_dev, active_bit);
+       if (err < 0)
+               goto st_accel_buffer_postenable_error;
+
+       err = iio_triggered_buffer_postenable(indio_dev);
+
+       return err;
+
+allocate_memory_error:
+       kfree(adata->buffer_data);
+st_accel_buffer_postenable_error:
+       return err;
+}
+
+static int st_accel_buffer_predisable(struct iio_dev *indio_dev)
+{
+       int err;
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       err = iio_triggered_buffer_predisable(indio_dev);
+       if (err < 0)
+               goto st_accel_buffer_predisable_error;
+
+       err = st_accel_set_axis_enable(indio_dev, ST_ACCEL_ENABLE_ALL_CHANNELS);
+       if (err < 0)
+               goto st_accel_buffer_predisable_error;
+
+       kfree(adata->buffer_data);
+
+st_accel_buffer_predisable_error:
+       return err;
+}
+
+static const struct iio_buffer_setup_ops st_accel_buffer_setup_ops = {
+       .preenable = &iio_sw_buffer_preenable,
+       .postenable = &st_accel_buffer_postenable,
+       .predisable = &st_accel_buffer_predisable,
+};
+
+int st_accel_allocate_ring(struct iio_dev *indio_dev)
+{
+       return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
+                       &st_accel_trigger_handler, &st_accel_buffer_setup_ops);
+}
+EXPORT_SYMBOL(st_accel_allocate_ring);
+
+void st_accel_deallocate_ring(struct iio_dev *indio_dev)
+{
+       iio_triggered_buffer_cleanup(indio_dev);
+}
+EXPORT_SYMBOL(st_accel_deallocate_ring);
diff --git a/drivers/iio/accel/st_accel_core.c
b/drivers/iio/accel/st_accel_core.c
new file mode 100644
index 0000000..791161e
--- /dev/null
+++ b/drivers/iio/accel/st_accel_core.c
@@ -0,0 +1,1171 @@
+/*
+ * STMicroelectronics accelerometers driver
+ *
+ * Copyright 2012 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@xxxxxx>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/mutex.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/irq.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/buffer.h>
+
+#include <linux/iio/accel/st_accel.h>
+
+
+#define ST_ACCEL_FULLSCALE_AVL_MAX             5
+#define ST_ACCEL_ODR_LIST_MAX                  10
+#define ST_ACCEL_ENABLE_ALL_CHANNELS           0x07
+
+/* DEFAULT VALUE FOR SENSORS */
+#define ST_ACCEL_DEFAULT_OUT_X_L_ADDR          0x28
+#define ST_ACCEL_DEFAULT_OUT_X_H_ADDR          0x29
+#define ST_ACCEL_DEFAULT_OUT_Y_L_ADDR          0x2a
+#define ST_ACCEL_DEFAULT_OUT_Y_H_ADDR          0x2b
+#define ST_ACCEL_DEFAULT_OUT_Z_L_ADDR          0x2c
+#define ST_ACCEL_DEFAULT_OUT_Z_H_ADDR          0x2d
+#define ST_ACCEL_DEFAULT_WAI_ADDRESS           0x0f
+#define ST_ACCEL_DEFAULT_POWER_ON_VALUE                0x01
+#define ST_ACCEL_DEFAULT_POWER_OFF_VALUE       0x00
+#define ST_ACCEL_DEFAULT_12_REALBITS           12
+#define ST_ACCEL_DEFAULT_16_REALBITS           16
+#define ST_ACCEL_DEFAULT_AXIS_ADDR             0x20
+#define ST_ACCEL_DEFAULT_AXIS_MASK             0x07
+#define ST_ACCEL_DEFAULT_AXIS_N_BIT            3
+
+/* FULLSCALE */
+#define ST_ACCEL_FS_AVL_2G                     2
+#define ST_ACCEL_FS_AVL_4G                     4
+#define ST_ACCEL_FS_AVL_6G                     6
+#define ST_ACCEL_FS_AVL_8G                     8
+#define ST_ACCEL_FS_AVL_16G                    16
+
+/* CUSTOM VALUES FOR SENSOR 1 */
+#define ST_ACCEL_1_WAI_EXP                     0x33
+#define ST_ACCEL_1_ODR_ADDR                    0x20
+#define ST_ACCEL_1_ODR_MASK                    0xf0
+#define ST_ACCEL_1_ODR_N_BIT                   4
+#define ST_ACCEL_1_ODR_AVL_1HZ_VAL             0x01
+#define ST_ACCEL_1_ODR_AVL_10HZ_VAL            0x02
+#define ST_ACCEL_1_ODR_AVL_25HZ_VAL            0x03
+#define ST_ACCEL_1_ODR_AVL_50HZ_VAL            0x04
+#define ST_ACCEL_1_ODR_AVL_100HZ_VAL           0x05
+#define ST_ACCEL_1_ODR_AVL_200HZ_VAL           0x06
+#define ST_ACCEL_1_ODR_AVL_400HZ_VAL           0x07
+#define ST_ACCEL_1_ODR_AVL_1600HZ_VAL          0x08
+#define ST_ACCEL_1_FS_N_BIT                    2
+#define ST_ACCEL_1_FS_ADDR                     0x23
+#define ST_ACCEL_1_FS_MASK                     0x30
+#define ST_ACCEL_1_FS_AVL_2_VAL                        0x00
+#define ST_ACCEL_1_FS_AVL_4_VAL                        0x01
+#define ST_ACCEL_1_FS_AVL_8_VAL                        0x02
+#define ST_ACCEL_1_FS_AVL_16_VAL               0x03
+#define ST_ACCEL_1_FS_AVL_2_GAIN               IIO_G_TO_M_S_2(1000)
+#define ST_ACCEL_1_FS_AVL_4_GAIN               IIO_G_TO_M_S_2(2000)
+#define ST_ACCEL_1_FS_AVL_8_GAIN               IIO_G_TO_M_S_2(4000)
+#define ST_ACCEL_1_FS_AVL_16_GAIN              IIO_G_TO_M_S_2(12000)
+#define ST_ACCEL_1_BDU_ADDR                    0x23
+#define ST_ACCEL_1_BDU_MASK                    0x80
+#define ST_ACCEL_1_DRDY_IRQ_ADDR               0x22
+#define ST_ACCEL_1_DRDY_IRQ_MASK               0x10
+#define ST_ACCEL_1_MULTIREAD_BIT               true
+
+/* CUSTOM VALUES FOR SENSOR 2 */
+#define ST_ACCEL_2_WAI_EXP                     0x49
+#define ST_ACCEL_2_ODR_ADDR                    0x20
+#define ST_ACCEL_2_ODR_MASK                    0xf0
+#define ST_ACCEL_2_ODR_N_BIT                   4
+#define ST_ACCEL_2_ODR_AVL_3HZ_VAL             0x01
+#define ST_ACCEL_2_ODR_AVL_6HZ_VAL             0x02
+#define ST_ACCEL_2_ODR_AVL_12HZ_VAL            0x03
+#define ST_ACCEL_2_ODR_AVL_25HZ_VAL            0x04
+#define ST_ACCEL_2_ODR_AVL_50HZ_VAL            0x05
+#define ST_ACCEL_2_ODR_AVL_100HZ_VAL           0x06
+#define ST_ACCEL_2_ODR_AVL_200HZ_VAL           0x07
+#define ST_ACCEL_2_ODR_AVL_400HZ_VAL           0x08
+#define ST_ACCEL_2_ODR_AVL_800HZ_VAL           0x09
+#define ST_ACCEL_2_ODR_AVL_1600HZ_VAL          0x0a
+#define ST_ACCEL_2_FS_N_BIT                    3
+#define ST_ACCEL_2_FS_ADDR                     0x21
+#define ST_ACCEL_2_FS_MASK                     0x38
+#define ST_ACCEL_2_FS_AVL_2_VAL                        0X00
+#define ST_ACCEL_2_FS_AVL_4_VAL                        0X01
+#define ST_ACCEL_2_FS_AVL_6_VAL                        0x02
+#define ST_ACCEL_2_FS_AVL_8_VAL                        0x03
+#define ST_ACCEL_2_FS_AVL_16_VAL               0x04
+#define ST_ACCEL_2_FS_AVL_2_GAIN               IIO_G_TO_M_S_2(61)
+#define ST_ACCEL_2_FS_AVL_4_GAIN               IIO_G_TO_M_S_2(122)
+#define ST_ACCEL_2_FS_AVL_6_GAIN               IIO_G_TO_M_S_2(183)
+#define ST_ACCEL_2_FS_AVL_8_GAIN               IIO_G_TO_M_S_2(244)
+#define ST_ACCEL_2_FS_AVL_16_GAIN              IIO_G_TO_M_S_2(732)
+#define ST_ACCEL_2_BDU_ADDR                    0x20
+#define ST_ACCEL_2_BDU_MASK                    0x08
+#define ST_ACCEL_2_DRDY_IRQ_ADDR               0x22
+#define ST_ACCEL_2_DRDY_IRQ_MASK               0x04
+#define ST_ACCEL_2_MULTIREAD_BIT               true
+
+/* CUSTOM VALUES FOR SENSOR 3 */
+#define ST_ACCEL_3_WAI_EXP                     0x32
+#define ST_ACCEL_3_ODR_ADDR                    0x20
+#define ST_ACCEL_3_ODR_MASK                    0x18
+#define ST_ACCEL_3_ODR_N_BIT                   2
+#define ST_ACCEL_3_ODR_AVL_50HZ_VAL            0x00
+#define ST_ACCEL_3_ODR_AVL_100HZ_VAL           0x01
+#define ST_ACCEL_3_ODR_AVL_400HZ_VAL           0x02
+#define ST_ACCEL_3_ODR_AVL_1000HZ_VAL          0x03
+#define ST_ACCEL_3_PW_ADDR                     0x20
+#define ST_ACCEL_3_PW_MASK                     0xe0
+#define ST_ACCEL_3_PW_N_BIT                    3
+#define ST_ACCEL_3_FS_N_BIT                    2
+#define ST_ACCEL_3_FS_ADDR                     0x23
+#define ST_ACCEL_3_FS_MASK                     0x30
+#define ST_ACCEL_3_FS_AVL_2_VAL                        0X00
+#define ST_ACCEL_3_FS_AVL_4_VAL                        0X01
+#define ST_ACCEL_3_FS_AVL_8_VAL                        0x03
+#define ST_ACCEL_3_FS_AVL_2_GAIN               IIO_G_TO_M_S_2(1000)
+#define ST_ACCEL_3_FS_AVL_4_GAIN               IIO_G_TO_M_S_2(2000)
+#define ST_ACCEL_3_FS_AVL_8_GAIN               IIO_G_TO_M_S_2(3900)
+#define ST_ACCEL_3_BDU_ADDR                    0x23
+#define ST_ACCEL_3_BDU_MASK                    0x80
+#define ST_ACCEL_3_DRDY_IRQ_ADDR               0x22
+#define ST_ACCEL_3_DRDY_IRQ_MASK               0x02
+#define ST_ACCEL_3_MULTIREAD_BIT               true
+
+/* CUSTOM VALUES FOR SENSOR 4 */
+#define ST_ACCEL_4_WAI_EXP                     0x40
+#define ST_ACCEL_4_ODR_ADDR                    0x20
+#define ST_ACCEL_4_ODR_MASK                    0xf0
+#define ST_ACCEL_4_ODR_N_BIT                   4
+#define ST_ACCEL_4_ODR_AVL_3HZ_VAL             0x01
+#define ST_ACCEL_4_ODR_AVL_6HZ_VAL             0x02
+#define ST_ACCEL_4_ODR_AVL_12HZ_VAL            0x03
+#define ST_ACCEL_4_ODR_AVL_25HZ_VAL            0x04
+#define ST_ACCEL_4_ODR_AVL_50HZ_VAL            0x05
+#define ST_ACCEL_4_ODR_AVL_100HZ_VAL           0x06
+#define ST_ACCEL_4_ODR_AVL_200HZ_VAL           0x07
+#define ST_ACCEL_4_ODR_AVL_400HZ_VAL           0x08
+#define ST_ACCEL_4_ODR_AVL_800HZ_VAL           0x09
+#define ST_ACCEL_4_ODR_AVL_1600HZ_VAL          0x0a
+#define ST_ACCEL_4_FS_N_BIT                    3
+#define ST_ACCEL_4_FS_ADDR                     0x24
+#define ST_ACCEL_4_FS_MASK                     0x38
+#define ST_ACCEL_4_FS_AVL_2_VAL                        0X00
+#define ST_ACCEL_4_FS_AVL_4_VAL                        0X01
+#define ST_ACCEL_4_FS_AVL_6_VAL                        0x02
+#define ST_ACCEL_4_FS_AVL_8_VAL                        0x03
+#define ST_ACCEL_4_FS_AVL_16_VAL               0x04
+#define ST_ACCEL_4_FS_AVL_2_GAIN               IIO_G_TO_M_S_2(61)
+#define ST_ACCEL_4_FS_AVL_4_GAIN               IIO_G_TO_M_S_2(122)
+#define ST_ACCEL_4_FS_AVL_6_GAIN               IIO_G_TO_M_S_2(183)
+#define ST_ACCEL_4_FS_AVL_8_GAIN               IIO_G_TO_M_S_2(244)
+#define ST_ACCEL_4_FS_AVL_16_GAIN              IIO_G_TO_M_S_2(732)
+#define ST_ACCEL_4_BDU_ADDR                    0x20
+#define ST_ACCEL_4_BDU_MASK                    0x08
+#define ST_ACCEL_4_DRDY_IRQ_ADDR               0x23
+#define ST_ACCEL_4_DRDY_IRQ_MASK               0x80
+#define ST_ACCEL_4_IG1_EN_ADDR                 0x23
+#define ST_ACCEL_4_IG1_EN_MASK                 0x08
+#define ST_ACCEL_4_MULTIREAD_BIT               false
+
+struct st_accel_odr_available {
+       unsigned int hz;
+       u8 value;
+};
+
+struct st_accel_odr {
+       u8 addr;
+       u8 mask;
+       short num_bit;
+       struct st_accel_odr_available odr_avl[ST_ACCEL_ODR_LIST_MAX];
+};
+
+struct st_accel_power {
+       u8 addr;
+       u8 mask;
+       unsigned short num_bit;
+       u8 value_off;
+       u8 value_on;
+};
+
+struct st_accel_axis {
+       u8 addr;
+       u8 mask;
+};
+
+struct st_accel_fullscale_available {
+       unsigned int num;
+       u8 value;
+       unsigned int gain;
+};
+
+struct st_accel_fullscale {
+       u8 addr;
+       u8 mask;
+       unsigned short num_bit;
+       struct st_accel_fullscale_available fs_avl[ST_ACCEL_FULLSCALE_AVL_MAX];
+};
+
+struct st_accel_bdu {
+       u8 addr;
+       u8 mask;
+};
+
+struct st_accel_interrupt_generator {
+       u8 en_addr;
+       u8 latch_mask_addr;
+       u8 en_mask;
+       u8 latching_mask;
+};
+
+struct st_accel_data_ready_irq {
+       u8 addr;
+       u8 mask;
+       struct st_accel_interrupt_generator ig1;
+};
+
+#define ST_ACCEL_LSM_CHANNELS(index, mod, endian, bits, addr) \
+{ \
+       .type = IIO_ACCEL, \
+       .modified = 1, \
+       .info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
+                                       IIO_CHAN_INFO_SCALE_SEPARATE_BIT, \
+       .scan_index = index, \
+       .channel2 = mod, \
+       .address = addr, \
+       .scan_type = { \
+               .sign = 's', \
+               .realbits = bits, \
+               .shift = 16 - bits, \
+               .storagebits = 16, \
+               .endianness = endian, \
+       }, \
+}
+
+static const struct iio_chan_spec st_accel_12bit_channels[] = {
+       ST_ACCEL_LSM_CHANNELS(ST_ACCEL_SCAN_X, IIO_MOD_X, IIO_LE,
+               ST_ACCEL_DEFAULT_12_REALBITS, ST_ACCEL_DEFAULT_OUT_X_L_ADDR),
+       ST_ACCEL_LSM_CHANNELS(ST_ACCEL_SCAN_Y, IIO_MOD_Y, IIO_LE,
+               ST_ACCEL_DEFAULT_12_REALBITS, ST_ACCEL_DEFAULT_OUT_Y_L_ADDR),
+       ST_ACCEL_LSM_CHANNELS(ST_ACCEL_SCAN_Z, IIO_MOD_Z, IIO_LE,
+               ST_ACCEL_DEFAULT_12_REALBITS, ST_ACCEL_DEFAULT_OUT_Z_L_ADDR),
+       IIO_CHAN_SOFT_TIMESTAMP(3)
+};
+
+static const struct iio_chan_spec st_accel_16bit_channels[] = {
+       ST_ACCEL_LSM_CHANNELS(ST_ACCEL_SCAN_X, IIO_MOD_X, IIO_LE,
+               ST_ACCEL_DEFAULT_16_REALBITS, ST_ACCEL_DEFAULT_OUT_X_L_ADDR),
+       ST_ACCEL_LSM_CHANNELS(ST_ACCEL_SCAN_Y, IIO_MOD_Y, IIO_LE,
+               ST_ACCEL_DEFAULT_16_REALBITS, ST_ACCEL_DEFAULT_OUT_Y_L_ADDR),
+       ST_ACCEL_LSM_CHANNELS(ST_ACCEL_SCAN_Z, IIO_MOD_Z, IIO_LE,
+               ST_ACCEL_DEFAULT_16_REALBITS, ST_ACCEL_DEFAULT_OUT_Z_L_ADDR),
+       IIO_CHAN_SOFT_TIMESTAMP(3)
+};
+
+/**
+ * struct st_accel_sensors - ST accel sensors list
+ * @wai: Contents of WhoAmI register.
+ * @ch: IIO channels for the sensor.
+ * @odr: Output data rate register and odr list available.
+ * @pw: Power register of the sensor.
+ * @enable_axis: Enable one or more axis of the sensor.
+ * @fs: Full scale register and fs list available.
+ * @bdu: Block data update register.
+ * @drdy_irq: Data ready register of the sensor.
+ * @multi_read_bit: Use or not particular bit for [I2C/SPI] multiread.
+ */
+static const struct st_accel_sensors {
+       u8 wai;
+       struct iio_chan_spec *ch;
+       struct st_accel_odr odr;
+       struct st_accel_power pw;
+       struct st_accel_axis enable_axis;
+       struct st_accel_fullscale fs;
+       struct st_accel_bdu bdu;
+       struct st_accel_data_ready_irq drdy_irq;
+       bool multi_read_bit;
+} st_accel_sensors[] = {
+       {
+               .wai = ST_ACCEL_1_WAI_EXP,
+               .ch = (struct iio_chan_spec *)st_accel_12bit_channels,
+               .odr = {
+                       .addr = ST_ACCEL_1_ODR_ADDR,
+                       .mask = ST_ACCEL_1_ODR_MASK,
+                       .num_bit = ST_ACCEL_1_ODR_N_BIT,
+                       .odr_avl = {
+                               { 1, ST_ACCEL_1_ODR_AVL_1HZ_VAL, },
+                               { 10, ST_ACCEL_1_ODR_AVL_10HZ_VAL, },
+                               { 25, ST_ACCEL_1_ODR_AVL_25HZ_VAL, },
+                               { 50, ST_ACCEL_1_ODR_AVL_50HZ_VAL, },
+                               { 100, ST_ACCEL_1_ODR_AVL_100HZ_VAL, },
+                               { 200, ST_ACCEL_1_ODR_AVL_200HZ_VAL, },
+                               { 400, ST_ACCEL_1_ODR_AVL_400HZ_VAL, },
+                               { 1600, ST_ACCEL_1_ODR_AVL_1600HZ_VAL, },
+                       },
+               },
+               .pw = {
+                       .addr = ST_ACCEL_1_ODR_ADDR,
+                       .mask = ST_ACCEL_1_ODR_MASK,
+                       .num_bit = ST_ACCEL_1_ODR_N_BIT,
+                       .value_off = ST_ACCEL_DEFAULT_POWER_OFF_VALUE,
+               },
+               .enable_axis = {
+                       .addr = ST_ACCEL_DEFAULT_AXIS_ADDR,
+                       .mask = ST_ACCEL_DEFAULT_AXIS_MASK,
+               },
+               .fs = {
+                       .addr = ST_ACCEL_1_FS_ADDR,
+                       .mask = ST_ACCEL_1_FS_MASK,
+                       .num_bit = ST_ACCEL_1_FS_N_BIT,
+                       .fs_avl = {
+                               [0] = {
+                                       .num = ST_ACCEL_FS_AVL_2G,
+                                       .value = ST_ACCEL_1_FS_AVL_2_VAL,
+                                       .gain = ST_ACCEL_1_FS_AVL_2_GAIN,
+                               },
+                               [1] = {
+                                       .num = ST_ACCEL_FS_AVL_4G,
+                                       .value = ST_ACCEL_1_FS_AVL_4_VAL,
+                                       .gain = ST_ACCEL_1_FS_AVL_4_GAIN,
+                               },
+                               [2] = {
+                                       .num = ST_ACCEL_FS_AVL_8G,
+                                       .value = ST_ACCEL_1_FS_AVL_8_VAL,
+                                       .gain = ST_ACCEL_1_FS_AVL_8_GAIN,
+                               },
+                               [3] = {
+                                       .num = ST_ACCEL_FS_AVL_16G,
+                                       .value = ST_ACCEL_1_FS_AVL_16_VAL,
+                                       .gain = ST_ACCEL_1_FS_AVL_16_GAIN,
+                               },
+                       },
+               },
+               .bdu = {
+                       .addr = ST_ACCEL_1_BDU_ADDR,
+                       .mask = ST_ACCEL_1_BDU_MASK,
+               },
+               .drdy_irq = {
+                       .addr = ST_ACCEL_1_DRDY_IRQ_ADDR,
+                       .mask = ST_ACCEL_1_DRDY_IRQ_MASK,
+               },
+               .multi_read_bit = ST_ACCEL_1_MULTIREAD_BIT,
+       },
+       {
+               .wai = ST_ACCEL_2_WAI_EXP,
+               .ch = (struct iio_chan_spec *)st_accel_16bit_channels,
+               .odr = {
+                       .addr = ST_ACCEL_2_ODR_ADDR,
+                       .mask = ST_ACCEL_2_ODR_MASK,
+                       .num_bit = ST_ACCEL_2_ODR_N_BIT,
+                       .odr_avl = {
+                               { 3, ST_ACCEL_2_ODR_AVL_3HZ_VAL, },
+                               { 6, ST_ACCEL_2_ODR_AVL_6HZ_VAL, },
+                               { 12, ST_ACCEL_2_ODR_AVL_12HZ_VAL, },
+                               { 25, ST_ACCEL_2_ODR_AVL_25HZ_VAL, },
+                               { 50, ST_ACCEL_2_ODR_AVL_50HZ_VAL, },
+                               { 100, ST_ACCEL_2_ODR_AVL_100HZ_VAL, },
+                               { 200, ST_ACCEL_2_ODR_AVL_200HZ_VAL, },
+                               { 400, ST_ACCEL_2_ODR_AVL_400HZ_VAL, },
+                               { 800, ST_ACCEL_2_ODR_AVL_800HZ_VAL, },
+                               { 1600, ST_ACCEL_2_ODR_AVL_1600HZ_VAL, },
+                       },
+               },
+               .pw = {
+                       .addr = ST_ACCEL_2_ODR_ADDR,
+                       .mask = ST_ACCEL_2_ODR_MASK,
+                       .num_bit = ST_ACCEL_2_ODR_N_BIT,
+                       .value_off = ST_ACCEL_DEFAULT_POWER_OFF_VALUE,
+               },
+               .enable_axis = {
+                       .addr = ST_ACCEL_DEFAULT_AXIS_ADDR,
+                       .mask = ST_ACCEL_DEFAULT_AXIS_MASK,
+               },
+               .fs = {
+                       .addr = ST_ACCEL_2_FS_ADDR,
+                       .mask = ST_ACCEL_2_FS_MASK,
+                       .num_bit = ST_ACCEL_2_FS_N_BIT,
+                       .fs_avl = {
+                               [0] = {
+                                       .num = ST_ACCEL_FS_AVL_2G,
+                                       .value = ST_ACCEL_2_FS_AVL_2_VAL,
+                                       .gain = ST_ACCEL_2_FS_AVL_2_GAIN,
+                               },
+                               [1] = {
+                                       .num = ST_ACCEL_FS_AVL_4G,
+                                       .value = ST_ACCEL_2_FS_AVL_4_VAL,
+                                       .gain = ST_ACCEL_2_FS_AVL_4_GAIN,
+                               },
+                               [2] = {
+                                       .num = ST_ACCEL_FS_AVL_6G,
+                                       .value = ST_ACCEL_2_FS_AVL_6_VAL,
+                                       .gain = ST_ACCEL_2_FS_AVL_6_GAIN,
+                               },
+                               [3] = {
+                                       .num = ST_ACCEL_FS_AVL_8G,
+                                       .value = ST_ACCEL_2_FS_AVL_8_VAL,
+                                       .gain = ST_ACCEL_2_FS_AVL_8_GAIN,
+                               },
+                               [4] = {
+                                       .num = ST_ACCEL_FS_AVL_16G,
+                                       .value = ST_ACCEL_2_FS_AVL_16_VAL,
+                                       .gain = ST_ACCEL_2_FS_AVL_16_GAIN,
+                               },
+                       },
+               },
+               .drdy_irq = {
+                       .addr = ST_ACCEL_2_DRDY_IRQ_ADDR,
+                       .mask = ST_ACCEL_2_DRDY_IRQ_MASK,
+               },
+               .bdu = {
+                       .addr = ST_ACCEL_2_BDU_ADDR,
+                       .mask = ST_ACCEL_2_BDU_MASK,
+               },
+               .multi_read_bit = ST_ACCEL_2_MULTIREAD_BIT,
+       },
+       {
+               .wai = ST_ACCEL_3_WAI_EXP,
+               .ch = (struct iio_chan_spec *)st_accel_12bit_channels,
+               .odr = {
+                       .addr = ST_ACCEL_3_ODR_ADDR,
+                       .mask = ST_ACCEL_3_ODR_MASK,
+                       .num_bit = ST_ACCEL_3_ODR_N_BIT,
+                       .odr_avl = {
+                               { 50, ST_ACCEL_3_ODR_AVL_50HZ_VAL, },
+                               { 100, ST_ACCEL_3_ODR_AVL_100HZ_VAL, },
+                               { 400, ST_ACCEL_3_ODR_AVL_400HZ_VAL, },
+                               { 1000, ST_ACCEL_3_ODR_AVL_1000HZ_VAL, },
+                       },
+               },
+               .pw = {
+                       .addr = ST_ACCEL_3_PW_ADDR,
+                       .mask = ST_ACCEL_3_PW_MASK,
+                       .num_bit = ST_ACCEL_3_PW_N_BIT,
+                       .value_on = ST_ACCEL_DEFAULT_POWER_ON_VALUE,
+                       .value_off = ST_ACCEL_DEFAULT_POWER_OFF_VALUE,
+               },
+               .enable_axis = {
+                       .addr = ST_ACCEL_DEFAULT_AXIS_ADDR,
+                       .mask = ST_ACCEL_DEFAULT_AXIS_MASK,
+               },
+               .fs = {
+                       .addr = ST_ACCEL_3_FS_ADDR,
+                       .mask = ST_ACCEL_3_FS_MASK,
+                       .num_bit = ST_ACCEL_3_FS_N_BIT,
+                       .fs_avl = {
+                               [0] = {
+                                       .num = ST_ACCEL_FS_AVL_2G,
+                                       .value = ST_ACCEL_3_FS_AVL_2_VAL,
+                                       .gain = ST_ACCEL_3_FS_AVL_2_GAIN,
+                               },
+                               [1] = {
+                                       .num = ST_ACCEL_FS_AVL_4G,
+                                       .value = ST_ACCEL_3_FS_AVL_4_VAL,
+                                       .gain = ST_ACCEL_3_FS_AVL_4_GAIN,
+                               },
+                               [2] = {
+                                       .num = ST_ACCEL_FS_AVL_8G,
+                                       .value = ST_ACCEL_3_FS_AVL_8_VAL,
+                                       .gain = ST_ACCEL_3_FS_AVL_8_GAIN,
+                               },
+                       },
+               },
+               .bdu = {
+                       .addr = ST_ACCEL_3_BDU_ADDR,
+                       .mask = ST_ACCEL_3_BDU_MASK,
+               },
+               .drdy_irq = {
+                       .addr = ST_ACCEL_3_DRDY_IRQ_ADDR,
+                       .mask = ST_ACCEL_3_DRDY_IRQ_MASK,
+               },
+               .multi_read_bit = ST_ACCEL_3_MULTIREAD_BIT,
+       },
+       {
+               .wai = ST_ACCEL_4_WAI_EXP,
+               .ch = (struct iio_chan_spec *)st_accel_16bit_channels,
+               .odr = {
+                       .addr = ST_ACCEL_4_ODR_ADDR,
+                       .mask = ST_ACCEL_4_ODR_MASK,
+                       .num_bit = ST_ACCEL_4_ODR_N_BIT,
+                       .odr_avl = {
+                               { 3, ST_ACCEL_4_ODR_AVL_3HZ_VAL },
+                               { 6, ST_ACCEL_4_ODR_AVL_6HZ_VAL, },
+                               { 12, ST_ACCEL_4_ODR_AVL_12HZ_VAL, },
+                               { 25, ST_ACCEL_4_ODR_AVL_25HZ_VAL, },
+                               { 50, ST_ACCEL_4_ODR_AVL_50HZ_VAL, },
+                               { 100, ST_ACCEL_4_ODR_AVL_100HZ_VAL, },
+                               { 200, ST_ACCEL_4_ODR_AVL_200HZ_VAL, },
+                               { 400, ST_ACCEL_4_ODR_AVL_400HZ_VAL, },
+                               { 800, ST_ACCEL_4_ODR_AVL_800HZ_VAL, },
+                               { 1600, ST_ACCEL_4_ODR_AVL_1600HZ_VAL, },
+                       },
+               },
+               .pw = {
+                       .addr = ST_ACCEL_4_ODR_ADDR,
+                       .mask = ST_ACCEL_4_ODR_MASK,
+                       .num_bit = ST_ACCEL_4_ODR_N_BIT,
+                       .value_off = ST_ACCEL_DEFAULT_POWER_OFF_VALUE,
+               },
+               .enable_axis = {
+                       .addr = ST_ACCEL_DEFAULT_AXIS_ADDR,
+                       .mask = ST_ACCEL_DEFAULT_AXIS_MASK,
+               },
+               .fs = {
+                       .addr = ST_ACCEL_4_FS_ADDR,
+                       .mask = ST_ACCEL_4_FS_MASK,
+                       .num_bit = ST_ACCEL_4_FS_N_BIT,
+                       .fs_avl = {
+                               [0] = {
+                                       .num = ST_ACCEL_FS_AVL_2G,
+                                       .value = ST_ACCEL_4_FS_AVL_2_VAL,
+                                       .gain = ST_ACCEL_4_FS_AVL_2_GAIN,
+                               },
+                               [1] = {
+                                       .num = ST_ACCEL_FS_AVL_4G,
+                                       .value = ST_ACCEL_4_FS_AVL_4_VAL,
+                                       .gain = ST_ACCEL_4_FS_AVL_4_GAIN,
+                               },
+                               [2] = {
+                                       .num = ST_ACCEL_FS_AVL_6G,
+                                       .value = ST_ACCEL_4_FS_AVL_6_VAL,
+                                       .gain = ST_ACCEL_4_FS_AVL_6_GAIN,
+                               },
+                               [3] = {
+                                       .num = ST_ACCEL_FS_AVL_8G,
+                                       .value = ST_ACCEL_4_FS_AVL_8_VAL,
+                                       .gain = ST_ACCEL_4_FS_AVL_8_GAIN,
+                               },
+                               [4] = {
+                                       .num = ST_ACCEL_FS_AVL_16G,
+                                       .value = ST_ACCEL_4_FS_AVL_16_VAL,
+                                       .gain = ST_ACCEL_4_FS_AVL_16_GAIN,
+                               },
+                       },
+               },
+               .bdu = {
+                       .addr = ST_ACCEL_4_BDU_ADDR,
+                       .mask = ST_ACCEL_4_BDU_MASK,
+               },
+               .drdy_irq = {
+                       .addr = ST_ACCEL_4_DRDY_IRQ_ADDR,
+                       .mask = ST_ACCEL_4_DRDY_IRQ_MASK,
+                       .ig1 = {
+                               .en_addr = ST_ACCEL_4_IG1_EN_ADDR,
+                               .en_mask = ST_ACCEL_4_IG1_EN_MASK,
+                       },
+               },
+               .multi_read_bit = ST_ACCEL_4_MULTIREAD_BIT,
+       },
+};
+
+static int st_accel_write_data_with_mask(struct iio_dev *indio_dev, u8
reg_addr,
+                                               u8 mask, short num_bit, u8 data)
+{
+       int err;
+       u8 *prev_data;
+       u8 new_data;
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       prev_data = kmalloc(sizeof(*prev_data), GFP_KERNEL);
+       if (prev_data == NULL) {
+               err = -ENOMEM;
+               goto st_accel_write_data_with_mask_error;
+       }
+
+       err = adata->read_byte(adata, reg_addr, prev_data);
+       if (err < 0)
+               goto st_accel_write_data_with_mask_error;
+
+       new_data = ((*prev_data & (~mask)) | ((data << __ffs(mask)) & mask));
+       err = adata->write_byte(adata, reg_addr, new_data);
+
+st_accel_write_data_with_mask_error:
+       return err;
+}
+
+static int st_accel_match_odr(const struct st_accel_sensors *sensor,
+               unsigned int odr, struct st_accel_odr_available *odr_out)
+{
+       int i, ret = -EINVAL;
+
+       for (i = 0; i < ARRAY_SIZE(sensor->odr.odr_avl); i++) {
+               if (sensor->odr.odr_avl[i].hz == odr) {
+                       odr_out->hz = sensor->odr.odr_avl[i].hz;
+                       odr_out->value = sensor->odr.odr_avl[i].value;
+                       ret = 0;
+                       break;
+               }
+       }
+
+       return ret;
+}
+
+static int st_accel_match_fs(const struct st_accel_sensors *sensor,
+               unsigned int fs, struct st_accel_fullscale_available *fs_out)
+{
+       int i, ret = -EINVAL;
+
+       for (i = 0; i < ARRAY_SIZE(sensor->fs.fs_avl); i++) {
+               if (sensor->fs.fs_avl[i].num == fs) {
+                       fs_out->num = sensor->fs.fs_avl[i].num;
+                       fs_out->gain = sensor->fs.fs_avl[i].gain;
+                       fs_out->value = sensor->fs.fs_avl[i].value;
+                       ret = 0;
+                       break;
+               }
+       }
+
+       return ret;
+}
+
+static int st_accel_match_scale(const struct st_accel_sensors *sensor,
+                       int scale, struct st_accel_fullscale_available *fs_out)
+{
+       int i, ret = -EINVAL;
+
+       for (i = 0; i < ARRAY_SIZE(sensor->fs.fs_avl); i++) {
+               if (sensor->fs.fs_avl[i].gain == scale) {
+                       fs_out->num = sensor->fs.fs_avl[i].num;
+                       fs_out->gain = sensor->fs.fs_avl[i].gain;
+                       fs_out->value = sensor->fs.fs_avl[i].value;
+                       ret = 0;
+                       break;
+               }
+       }
+
+       return ret;
+}
+
+int st_accel_set_dataready_irq(struct iio_dev *indio_dev, bool enable)
+{
+       int err;
+       struct st_accel_data *adata;
+
+       adata = iio_priv(indio_dev);
+       if (st_accel_sensors[adata->index].drdy_irq.ig1.en_addr > 0) {
+               err = st_accel_write_data_with_mask(indio_dev,
+                       st_accel_sensors[adata->index].drdy_irq.ig1.en_addr,
+                       st_accel_sensors[adata->index].drdy_irq.ig1.en_mask, 1,
+                       (int)enable);
+               if (err < 0)
+                       goto st_accel_set_dataready_irq_error;
+       }
+
+       if (st_accel_sensors[adata->index].drdy_irq.ig1.latch_mask_addr > 0) {
+               err = st_accel_write_data_with_mask(indio_dev,
+               st_accel_sensors[adata->index].drdy_irq.ig1.latch_mask_addr,
+               st_accel_sensors[adata->index].drdy_irq.ig1.latching_mask, 1,
+                       (int)enable);
+               if (err < 0)
+                       goto st_accel_set_dataready_irq_error;
+       }
+
+       err = st_accel_write_data_with_mask(indio_dev,
+               st_accel_sensors[adata->index].drdy_irq.addr,
+               st_accel_sensors[adata->index].drdy_irq.mask, 1, (int)enable);
+
+st_accel_set_dataready_irq_error:
+       return err;
+}
+EXPORT_SYMBOL(st_accel_set_dataready_irq);
+
+static int st_accel_set_bdu(struct iio_dev *indio_dev,
+                               const struct st_accel_bdu *bdu, bool value)
+{
+       return st_accel_write_data_with_mask(indio_dev, bdu->addr, bdu->mask,
+                                                               1, (u8)value);
+}
+
+static int st_accel_set_odr(struct iio_dev *indio_dev,
+                               struct st_accel_odr_available *odr_available)
+{
+       int err;
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       if ((st_accel_sensors[adata->index].odr.addr ==
+               st_accel_sensors[adata->index].pw.addr) &&
+               (st_accel_sensors[adata->index].odr.mask ==
+                               st_accel_sensors[adata->index].pw.mask)) {
+               if (adata->enabled == true) {
+                       err = st_accel_write_data_with_mask(indio_dev,
+                               st_accel_sensors[adata->index].odr.addr,
+                               st_accel_sensors[adata->index].odr.mask,
+                               st_accel_sensors[adata->index].odr.num_bit,
+                               odr_available->value);
+               } else {
+                       adata->odr = odr_available->hz;
+                       err = 0;
+               }
+       } else {
+               err = st_accel_write_data_with_mask(indio_dev,
+                               st_accel_sensors[adata->index].odr.addr,
+                               st_accel_sensors[adata->index].odr.mask,
+                               st_accel_sensors[adata->index].odr.num_bit,
+                               odr_available->value);
+       }
+
+       return err;
+}
+
+int st_accel_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable)
+{
+       int err;
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       err = st_accel_write_data_with_mask(indio_dev,
+                       st_accel_sensors[adata->index].enable_axis.addr,
+                       st_accel_sensors[adata->index].enable_axis.mask,
+                       ST_ACCEL_DEFAULT_AXIS_N_BIT, axis_enable);
+
+       return err;
+}
+
+static int st_accel_set_enable(struct iio_dev *indio_dev, bool enable)
+{
+       int err = -EINVAL;
+       bool found;
+       u8 tmp_value;
+       struct st_accel_odr_available odr_out;
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       if (enable) {
+               found = false;
+               tmp_value = st_accel_sensors[adata->index].pw.value_on;
+               if ((st_accel_sensors[adata->index].odr.addr ==
+                               st_accel_sensors[adata->index].pw.addr) &&
+                       (st_accel_sensors[adata->index].odr.mask ==
+                               st_accel_sensors[adata->index].pw.mask)) {
+                       err = st_accel_match_odr(
+                               &st_accel_sensors[adata->index], adata->odr,
+                                       &odr_out);
+                       if (err < 0)
+                               goto set_enable_error;
+                       tmp_value = odr_out.value;
+                       found = true;
+               }
+               err = st_accel_write_data_with_mask(indio_dev,
+                               st_accel_sensors[adata->index].pw.addr,
+                               st_accel_sensors[adata->index].pw.mask,
+                               st_accel_sensors[adata->index].pw.num_bit,
+                               tmp_value);
+               if (err < 0)
+                       goto set_enable_error;
+               adata->enabled = true;
+               if (found)
+                       adata->odr = odr_out.hz;
+       } else {
+               err = st_accel_write_data_with_mask(indio_dev,
+                               st_accel_sensors[adata->index].pw.addr,
+                               st_accel_sensors[adata->index].pw.mask,
+                               st_accel_sensors[adata->index].pw.num_bit,
+                               st_accel_sensors[adata->index].pw.value_off);
+               if (err < 0)
+                       goto set_enable_error;
+               adata->enabled = false;
+       }
+
+set_enable_error:
+       return err;
+}
+
+static int st_accel_set_fullscale(struct iio_dev *indio_dev,
+                               struct st_accel_fullscale_available *fs_avl)
+{
+       int err;
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       err = st_accel_write_data_with_mask(indio_dev,
+                               st_accel_sensors[adata->index].fs.addr,
+                               st_accel_sensors[adata->index].fs.mask,
+                               st_accel_sensors[adata->index].fs.num_bit,
+                               fs_avl->value);
+       if (err < 0)
+               goto st_accel_set_fullscale_error;
+
+       adata->fullscale = fs_avl->num;
+       adata->gain = fs_avl->gain;
+       return err;
+
+st_accel_set_fullscale_error:
+       dev_err(&indio_dev->dev, "failed to set new fullscale.\n");
+       return err;
+}
+
+static int st_accel_read_raw(struct iio_dev *indio_dev,
+                       struct iio_chan_spec const *ch, int *val,
+                                                       int *val2, long mask)
+{
+       int err;
+       u8 *outdata;
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       switch (mask) {
+       case IIO_CHAN_INFO_RAW:
+               mutex_lock(&indio_dev->mlock);
+               if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
+                       err = -EBUSY;
+                       goto device_read_error;
+               } else {
+                       if (!adata->enabled) {
+                               err = -EIO;
+                               goto device_read_error;
+                       } else {
+                               outdata = kmalloc(sizeof(*outdata*
+                                       ST_ACCEL_BYTE_FOR_CHANNEL), GFP_KERNEL);
+                               if (outdata == NULL) {
+                                       err = -ENOMEM;
+                                       goto device_read_error;
+                               }
+
+                               err = adata->read_multiple_byte(adata,
+                                       ch->address, ST_ACCEL_BYTE_FOR_CHANNEL,
+                                       outdata);
+                               if (err < 0)
+                                       goto read_error;
+
+                               *val = ((s16)le16_to_cpup((u16 *)outdata))
+                                                       >> ch->scan_type.shift;
+                       }
+               }
+               mutex_unlock(&indio_dev->mlock);
+               kfree(outdata);
+               return IIO_VAL_INT;
+       case IIO_CHAN_INFO_SCALE:
+               *val = 0;
+               *val2 = adata->gain;
+               return IIO_VAL_INT_PLUS_MICRO;
+       default:
+               return -EINVAL;
+       }
+
+read_error:
+       kfree(outdata);
+device_read_error:
+       mutex_unlock(&indio_dev->mlock);
+       return err;
+}
+
+static int st_accel_write_raw(struct iio_dev *indio_dev,
+               struct iio_chan_spec const *chan, int val, int val2, long mask)
+{
+       int err;
+       struct st_accel_fullscale_available fs_out;
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       switch (mask) {
+       case IIO_CHAN_INFO_SCALE:
+               err = st_accel_match_scale(&st_accel_sensors[adata->index],
+                                                               val2, &fs_out);
+               if (err < 0)
+                       goto write_error;
+
+               err = st_accel_set_fullscale(indio_dev, &fs_out);
+               break;
+       default:
+               err = -EINVAL;
+       }
+
+write_error:
+       return err;
+}
+
+static int st_accel_check_device_list(struct iio_dev *indio_dev, u8 wai)
+{
+       int i;
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       for (i = 0; i < ARRAY_SIZE(st_accel_sensors); i++) {
+               if (st_accel_sensors[i].wai == wai)
+                       break;
+       }
+       if (i == ARRAY_SIZE(st_accel_sensors))
+               goto check_device_error;
+
+       adata->index = i;
+
+       return i;
+
+check_device_error:
+       dev_err(&indio_dev->dev, "device not supported -> wai (0x%x).\n", wai);
+       return -ENODEV;
+}
+
+static int st_accel_get_wai_device(struct iio_dev *indio_dev, u8 reg_addr,
+                                                               u8 *value)
+{
+       int ret;
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       ret = adata->read_byte(adata, reg_addr, value);
+       if (ret < 0)
+               goto read_byte_wai_error;
+
+       return 0;
+
+read_byte_wai_error:
+       dev_err(&indio_dev->dev,
+                       "failed to read WhoAmI (register 0x%x).\n", reg_addr);
+       return -EIO;
+}
+
+static ssize_t st_accel_sysfs_set_sampling_frequency(struct device *dev,
+               struct device_attribute *attr, const char *buf, size_t size)
+{
+       int err;
+       unsigned int freq;
+       struct st_accel_odr_available odr_out;
+       struct iio_dev *indio_dev = dev_get_drvdata(dev);
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       err = kstrtoint(buf, 10, &freq);
+       if (err < 0)
+               goto conversion_error;
+
+       mutex_lock(&indio_dev->mlock);
+       err = st_accel_match_odr(&st_accel_sensors[adata->index],
+                                                               freq, &odr_out);
+       if (err < 0)
+               goto st_accel_sysfs_set_sampling_frequency_error;
+
+       err = st_accel_set_odr(indio_dev, &odr_out);
+       if (err < 0)
+               goto st_accel_sysfs_set_sampling_frequency_error;
+
+       adata->odr = odr_out.hz;
+
+st_accel_sysfs_set_sampling_frequency_error:
+       mutex_unlock(&indio_dev->mlock);
+conversion_error:
+       return err < 0 ? err : size;
+}
+
+static ssize_t st_accel_sysfs_get_sampling_frequency(struct device *dev,
+                               struct device_attribute *attr, char *buf)
+{
+       struct iio_dev *indio_dev = dev_get_drvdata(dev);
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       return sprintf(buf, "%d\n", adata->odr);
+}
+
+static ssize_t st_accel_sysfs_set_powerdown(struct device *dev,
+               struct device_attribute *attr, const char *buf, size_t size)
+{
+       int err;
+       bool powerdown;
+       struct iio_dev *indio_dev = dev_get_drvdata(dev);
+
+       err = strtobool(buf, &powerdown);
+       if (err < 0)
+               goto set_enable_error;
+
+       mutex_lock(&indio_dev->mlock);
+       err = st_accel_set_enable(indio_dev, !powerdown);
+       mutex_unlock(&indio_dev->mlock);
+
+set_enable_error:
+       return err < 0 ? err : size;
+}
+
+static ssize_t st_accel_sysfs_get_powerdown(struct device *dev,
+                               struct device_attribute *attr, char *buf)
+{
+       struct iio_dev *indio_dev = dev_get_drvdata(dev);
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       return sprintf(buf, "%d\n", (int)(!adata->enabled));
+}
+
+static ssize_t st_accel_sysfs_scale_available(struct device *dev,
+                               struct device_attribute *attr, char *buf)
+{
+       int i, len = 0;
+       struct iio_dev *indio_dev = dev_get_drvdata(dev);
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       mutex_lock(&indio_dev->mlock);
+       for (i = 0; i < ARRAY_SIZE(st_accel_sensors[adata->index].fs.fs_avl);
+                                                                       i++) {
+               if (st_accel_sensors[adata->index].fs.fs_avl[i].num == 0)
+                       break;
+
+               len += sprintf(buf+len, "0.%06u ",
+                       st_accel_sensors[adata->index].fs.fs_avl[i].gain);
+       }
+       mutex_unlock(&indio_dev->mlock);
+       buf[len-1] = '\n';
+
+       return len;
+}
+
+static ssize_t st_accel_sysfs_sampling_frequency_available(struct
device *dev,
+                               struct device_attribute *attr, char *buf)
+{
+       int i, len = 0;
+       struct iio_dev *indio_dev = dev_get_drvdata(dev);
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       mutex_lock(&indio_dev->mlock);
+       for (i = 0; i < ARRAY_SIZE(st_accel_sensors[adata->index].odr.odr_avl);
+                                                                       i++) {
+               if (st_accel_sensors[adata->index].odr.odr_avl[i].hz == 0)
+                       break;
+
+               len += sprintf(buf + len, "%d ",
+                       st_accel_sensors[adata->index].odr.odr_avl[i].hz);
+       }
+       mutex_unlock(&indio_dev->mlock);
+       buf[len - 1] = '\n';
+
+       return len;
+}
+
+static IIO_DEVICE_ATTR(sampling_frequency_available, S_IRUGO,
+               st_accel_sysfs_sampling_frequency_available, NULL , 0);
+
+static IIO_DEVICE_ATTR(in_accel_scale_available, S_IRUGO,
+                               st_accel_sysfs_scale_available, NULL , 0);
+
+static IIO_DEVICE_ATTR(powerdown, S_IWUSR | S_IRUGO,
+               st_accel_sysfs_get_powerdown, st_accel_sysfs_set_powerdown , 0);
+
+static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
+                       st_accel_sysfs_get_sampling_frequency,
+                                       st_accel_sysfs_set_sampling_frequency);
+
+static struct attribute *st_accel_attributes[] = {
+       &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
+       &iio_dev_attr_in_accel_scale_available.dev_attr.attr,
+       &iio_dev_attr_powerdown.dev_attr.attr,
+       &iio_dev_attr_sampling_frequency.dev_attr.attr,
+       NULL,
+};
+
+static const struct attribute_group st_accel_attribute_group = {
+       .attrs = st_accel_attributes,
+};
+
+static const struct iio_info acc_info = {
+       .driver_module = THIS_MODULE,
+       .attrs = &st_accel_attribute_group,
+       .read_raw = &st_accel_read_raw,
+       .write_raw = &st_accel_write_raw,
+};
+
+static int st_accel_init_sensor(struct iio_dev *indio_dev)
+{
+       int err;
+       struct st_accel_odr_available odr_out;
+       struct st_accel_fullscale_available fs_out;
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       err = st_accel_set_enable(indio_dev, false);
+       if (err < 0)
+               goto init_error;
+
+       err = st_accel_set_axis_enable(indio_dev, ST_ACCEL_ENABLE_ALL_CHANNELS);
+       if (err < 0)
+               goto init_error;
+
+       st_accel_match_fs(&st_accel_sensors[adata->index],
+                                               adata->fullscale, &fs_out);
+       err = st_accel_set_fullscale(indio_dev, &fs_out);
+       if (err < 0)
+               goto init_error;
+
+       st_accel_match_odr(&st_accel_sensors[adata->index],
+                                                       adata->odr, &odr_out);
+       err = st_accel_set_odr(indio_dev, &odr_out);
+       if (err < 0)
+               goto init_error;
+
+       err = st_accel_set_bdu(indio_dev,
+                               &st_accel_sensors[adata->index].bdu, true);
+
+init_error:
+       return err;
+}
+
+int st_accel_iio_probe(struct iio_dev *indio_dev, int irq)
+{
+       int err;
+       u8 *wai;
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       indio_dev->modes = INDIO_DIRECT_MODE;
+       indio_dev->info = &acc_info;
+
+       wai = kmalloc(sizeof(*wai), GFP_KERNEL);
+       if (wai == NULL) {
+               err = -ENOMEM;
+               goto st_accel_iio_probe_error;
+       }
+
+       err = st_accel_get_wai_device(indio_dev,
+                                       ST_ACCEL_DEFAULT_WAI_ADDRESS, wai);
+       if (err < 0)
+               goto st_accel_iio_probe_error;
+
+       err = st_accel_check_device_list(indio_dev, *wai);
+       if (err < 0)
+               goto st_accel_iio_probe_error;
+
+       adata->multiread_bit = st_accel_sensors[adata->index].multi_read_bit;
+       indio_dev->channels = st_accel_sensors[adata->index].ch;
+       indio_dev->num_channels = ST_ACCEL_NUMBER_ALL_CHANNELS;
+
+       adata->fullscale = ST_ACCEL_FS_AVL_2G;
+       adata->odr = 100;
+
+       err = st_accel_init_sensor(indio_dev);
+       if (err < 0)
+               goto st_accel_iio_probe_error;
+
+       err = st_accel_allocate_ring(indio_dev);
+       if (err < 0)
+               goto st_accel_iio_probe_error;
+
+       if (irq > 0) {
+               err = st_accel_probe_trigger(indio_dev, irq);
+               if (err < 0)
+                       goto acc_probe_trigger_error;
+       }
+
+       err = iio_device_register(indio_dev);
+       if (err)
+               goto iio_device_register_error;
+
+       return err;
+
+iio_device_register_error:
+       st_accel_remove_trigger(indio_dev, irq);
+acc_probe_trigger_error:
+       st_accel_deallocate_ring(indio_dev);
+st_accel_iio_probe_error:
+       return err;
+}
+EXPORT_SYMBOL(st_accel_iio_probe);
+
+void st_accel_iio_remove(struct iio_dev *indio_dev, int irq)
+{
+       iio_device_unregister(indio_dev);
+       st_accel_remove_trigger(indio_dev, irq);
+       st_accel_deallocate_ring(indio_dev);
+       iio_device_free(indio_dev);
+}
+EXPORT_SYMBOL(st_accel_iio_remove);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@xxxxxx>");
+MODULE_DESCRIPTION("STMicroelectronics accelerometers driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/accel/st_accel_i2c.c
b/drivers/iio/accel/st_accel_i2c.c
new file mode 100644
index 0000000..87b50e1
--- /dev/null
+++ b/drivers/iio/accel/st_accel_i2c.c
@@ -0,0 +1,128 @@
+/*
+ * STMicroelectronics accelerometers driver
+ *
+ * Copyright 2012 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@xxxxxx>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+
+#include <linux/iio/accel/st_accel.h>
+
+#define ST_ACCEL_I2C_MULTIREAD                 0x80
+
+static int st_accel_i2c_read_byte(struct st_accel_data *adata,
+                                               u8 reg_addr, u8 *res_byte)
+{
+       int err;
+
+       err = i2c_smbus_read_byte_data(to_i2c_client(adata->dev), reg_addr);
+       if (err < 0)
+               goto st_accel_i2c_read_byte_error;
+
+       *res_byte = err & 0xff;
+
+st_accel_i2c_read_byte_error:
+       return err < 0 ? err : 0;
+}
+
+static int st_accel_i2c_read_multiple_byte(struct st_accel_data *adata,
+                                               u8 reg_addr, int len, u8 *data)
+{
+       if (adata->multiread_bit == true)
+               reg_addr |= ST_ACCEL_I2C_MULTIREAD;
+
+       return i2c_smbus_read_i2c_block_data(to_i2c_client(adata->dev),
+                                                       reg_addr, len, data);
+}
+
+static int st_accel_i2c_write_byte(struct st_accel_data *adata,
+                                                       u8 reg_addr, u8 data)
+{
+       return i2c_smbus_write_byte_data(to_i2c_client(adata->dev),
+                                                               reg_addr, data);
+}
+
+static int __devinit st_accel_i2c_probe(struct i2c_client *client,
+                               const struct i2c_device_id *id)
+{
+       struct iio_dev *indio_dev;
+       struct st_accel_data *adata;
+       int err;
+
+       indio_dev = iio_device_alloc(sizeof(*adata));
+       if (indio_dev == NULL) {
+               err = -ENOMEM;
+               goto iio_device_alloc_error;
+       }
+
+       adata = iio_priv(indio_dev);
+       adata->dev = &client->dev;
+       i2c_set_clientdata(client, indio_dev);
+
+       indio_dev->dev.parent = &client->dev;
+       indio_dev->name = client->name;
+
+       adata->read_byte = st_accel_i2c_read_byte;
+       adata->write_byte = st_accel_i2c_write_byte;
+       adata->read_multiple_byte = st_accel_i2c_read_multiple_byte;
+
+       err = st_accel_iio_probe(indio_dev, client->irq);
+       if (err < 0)
+               goto acc_iio_default_error;
+
+       return 0;
+
+acc_iio_default_error:
+       iio_device_free(indio_dev);
+iio_device_alloc_error:
+       return err;
+}
+
+static int st_accel_i2c_remove(struct i2c_client *client)
+{
+       struct iio_dev *indio_dev = i2c_get_clientdata(client);
+       st_accel_iio_remove(indio_dev, client->irq);
+
+       return 0;
+}
+
+static const struct i2c_device_id st_accel_id_table[] = {
+       { LSM303DLH_ACCEL_DEV_NAME },
+       { LSM303DLHC_ACCEL_DEV_NAME },
+       { LIS3DH_ACCEL_DEV_NAME },
+       { LSM330D_ACCEL_DEV_NAME },
+       { LSM330DL_ACCEL_DEV_NAME },
+       { LSM330DLC_ACCEL_DEV_NAME },
+       { LSM303D_ACCEL_DEV_NAME },
+       { LSM9DS0_ACCEL_DEV_NAME },
+       { LIS331DLH_ACCEL_DEV_NAME },
+       { LSM303DL_ACCEL_DEV_NAME },
+       { LSM303DLM_ACCEL_DEV_NAME },
+       { LSM330_ACCEL_DEV_NAME },
+       {},
+};
+MODULE_DEVICE_TABLE(i2c, st_accel_id_table);
+
+static struct i2c_driver st_accel_driver = {
+       .driver = {
+               .owner = THIS_MODULE,
+               .name = "st-accel-i2c",
+       },
+       .probe = st_accel_i2c_probe,
+       .remove = st_accel_i2c_remove,
+       .id_table = st_accel_id_table,
+};
+module_i2c_driver(st_accel_driver);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@xxxxxx>");
+MODULE_DESCRIPTION("STMicroelectronics accelerometers i2c driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/accel/st_accel_spi.c
b/drivers/iio/accel/st_accel_spi.c
new file mode 100644
index 0000000..6df1440
--- /dev/null
+++ b/drivers/iio/accel/st_accel_spi.c
@@ -0,0 +1,182 @@
+/*
+ * STMicroelectronics accelerometers driver
+ *
+ * Copyright 2012 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@xxxxxx>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/spi/spi.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+
+#include <linux/iio/accel/st_accel.h>
+
+
+#define ACC_SPI_READ           0x80;
+#define ACC_SPI_MULTIREAD      0xc0
+
+static int st_accel_spi_read(struct st_accel_data *adata,
+                                               u8 reg_addr, int len, u8 *data)
+{
+       struct spi_message msg;
+       int err;
+       u8 *tx;
+
+       struct spi_transfer xfers[] = {
+               {
+                       .bits_per_word = 8,
+                       .len = 1,
+               },
+               {
+                       .rx_buf = data,
+                       .bits_per_word = 8,
+                       .len = len,
+               }
+       };
+
+       tx = kmalloc(sizeof(*tx), GFP_KERNEL);
+       if (tx == NULL) {
+               err = -ENOMEM;
+               goto acc_spi_read_error;
+       }
+
+       if ((adata->multiread_bit == true) && (len > 1))
+               *tx = reg_addr | ACC_SPI_MULTIREAD;
+       else
+               *tx = reg_addr | ACC_SPI_READ;
+
+       xfers[0].tx_buf = tx;
+       spi_message_init(&msg);
+       spi_message_add_tail(&xfers[0], &msg);
+       spi_message_add_tail(&xfers[1], &msg);
+       err = spi_sync(to_spi_device(adata->dev), &msg);
+       if (err)
+               goto acc_spi_read_error;
+
+       return len;
+
+acc_spi_read_error:
+       return err;
+}
+
+static int st_accel_spi_read_byte(struct st_accel_data *adata,
+                                               u8 reg_addr, u8 *res_byte)
+{
+       return st_accel_spi_read(adata, reg_addr, 1, res_byte);
+}
+
+static int st_accel_spi_read_multiple_byte(struct st_accel_data *adata,
+                                               u8 reg_addr, int len, u8 *data)
+{
+       return st_accel_spi_read(adata, reg_addr, len, data);
+}
+
+static int st_accel_spi_write_byte(struct st_accel_data *adata,
+                                                       u8 reg_addr, u8 data)
+{
+       struct spi_message msg;
+       int err;
+       u8 *tx;
+
+       struct spi_transfer xfers = {
+               .bits_per_word = 8,
+               .len = 2,
+       };
+
+       tx = kmalloc(sizeof(*tx)*2, GFP_KERNEL);
+       if (tx == NULL) {
+               err = -ENOMEM;
+               goto alloc_memory_error;
+       }
+
+       tx[0] = reg_addr;
+       tx[1] = data;
+       xfers.tx_buf = tx;
+       spi_message_init(&msg);
+       spi_message_add_tail(&xfers, &msg);
+       err = spi_sync(to_spi_device(adata->dev), &msg);
+
+alloc_memory_error:
+       return err;
+}
+
+static int __devinit st_accel_spi_probe(struct spi_device *spi)
+{
+       struct iio_dev *indio_dev;
+       struct st_accel_data *adata;
+       int err;
+
+       indio_dev = iio_device_alloc(sizeof(*adata));
+       if (indio_dev == NULL) {
+               err = -ENOMEM;
+               goto iio_device_alloc_error;
+       }
+
+       adata = iio_priv(indio_dev);
+       adata->dev = &spi->dev;
+       spi_set_drvdata(spi, indio_dev);
+
+       indio_dev->dev.parent = &spi->dev;
+       indio_dev->name = spi->modalias;
+
+       adata->read_byte = st_accel_spi_read_byte;
+       adata->write_byte = st_accel_spi_write_byte;
+       adata->read_multiple_byte = st_accel_spi_read_multiple_byte;
+
+       err = st_accel_iio_probe(indio_dev, spi->irq);
+       if (err < 0)
+               goto acc_iio_default_error;
+
+       return 0;
+
+acc_iio_default_error:
+       iio_device_free(indio_dev);
+iio_device_alloc_error:
+       return err;
+}
+
+static int st_accel_spi_remove(struct spi_device *spi)
+{
+       struct iio_dev *indio_dev = spi_get_drvdata(spi);
+       st_accel_iio_remove(indio_dev, spi->irq);
+
+       return 0;
+}
+
+static const struct spi_device_id st_accel_id_table[] = {
+       { LSM303DLH_ACCEL_DEV_NAME },
+       { LSM303DLHC_ACCEL_DEV_NAME },
+       { LIS3DH_ACCEL_DEV_NAME },
+       { LSM330D_ACCEL_DEV_NAME },
+       { LSM330DL_ACCEL_DEV_NAME },
+       { LSM330DLC_ACCEL_DEV_NAME },
+       { LSM303D_ACCEL_DEV_NAME },
+       { LSM9DS0_ACCEL_DEV_NAME },
+       { LIS331DLH_ACCEL_DEV_NAME },
+       { LSM303DL_ACCEL_DEV_NAME },
+       { LSM303DLM_ACCEL_DEV_NAME },
+       { LSM330_ACCEL_DEV_NAME },
+       {},
+};
+MODULE_DEVICE_TABLE(spi, st_accel_id_table);
+
+static struct spi_driver st_accel_driver = {
+       .driver = {
+               .owner = THIS_MODULE,
+               .name = "st-accel-spi",
+       },
+       .probe = st_accel_spi_probe,
+       .remove = st_accel_spi_remove,
+       .id_table = st_accel_id_table,
+};
+module_spi_driver(st_accel_driver);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@xxxxxx>");
+MODULE_DESCRIPTION("STMicroelectronics accelerometers spi driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/accel/st_accel_trigger.c
b/drivers/iio/accel/st_accel_trigger.c
new file mode 100644
index 0000000..68813f7
--- /dev/null
+++ b/drivers/iio/accel/st_accel_trigger.c
@@ -0,0 +1,83 @@
+/*
+ * STMicroelectronics accelerometers driver
+ *
+ * Copyright 2012 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@xxxxxx>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/interrupt.h>
+#include <linux/i2c.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+
+#include <linux/iio/accel/st_accel.h>
+
+static int st_accel_trig_acc_set_state(struct iio_trigger *trig, bool
state)
+{
+       struct iio_dev *indio_dev = trig->private_data;
+       return st_accel_set_dataready_irq(indio_dev, state);
+}
+
+static const struct iio_trigger_ops st_accel_trigger_ops = {
+       .owner = THIS_MODULE,
+       .set_trigger_state = &st_accel_trig_acc_set_state,
+};
+
+int st_accel_probe_trigger(struct iio_dev *indio_dev, int irq)
+{
+       int err;
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       adata->trig = iio_trigger_alloc("%s-trigger", indio_dev->name);
+       if (adata->trig == NULL) {
+               err = -ENOMEM;
+               dev_err(&indio_dev->dev, "failed to allocate iio trigger.\n");
+               goto iio_trigger_alloc_error;
+       }
+
+       err = request_threaded_irq(irq,
+                       iio_trigger_generic_data_rdy_poll,
+                       NULL,
+                       IRQF_TRIGGER_RISING,
+                       adata->trig->name,
+                       adata->trig);
+       if (err)
+               goto request_irq_error;
+
+       adata->trig->private_data = indio_dev;
+       adata->trig->ops = &st_accel_trigger_ops;
+       adata->trig->dev.parent = adata->dev;
+
+       err = iio_trigger_register(adata->trig);
+       if (err < 0) {
+               dev_err(&indio_dev->dev, "failed to register iio trigger.\n");
+               goto iio_trigger_register_error;
+       }
+       indio_dev->trig = adata->trig;
+
+       return 0;
+
+iio_trigger_register_error:
+       free_irq(irq, adata->trig);
+request_irq_error:
+       iio_trigger_free(adata->trig);
+iio_trigger_alloc_error:
+       return err;
+}
+EXPORT_SYMBOL(st_accel_probe_trigger);
+
+void st_accel_remove_trigger(struct iio_dev *indio_dev, int irq)
+{
+       struct st_accel_data *adata = iio_priv(indio_dev);
+
+       iio_trigger_unregister(adata->trig);
+       free_irq(irq, adata->trig);
+       iio_trigger_free(adata->trig);
+}
+EXPORT_SYMBOL(st_accel_remove_trigger);
diff --git a/include/linux/iio/accel/st_accel.h
b/include/linux/iio/accel/st_accel.h
new file mode 100644
index 0000000..9e0abd6
--- /dev/null
+++ b/include/linux/iio/accel/st_accel.h
@@ -0,0 +1,102 @@
+/*
+ * STMicroelectronics accelerometers driver
+ *
+ * Copyright 2012 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@xxxxxx>
+ * v. 1.0.0
+ * Licensed under the GPL-2.
+ */
+
+#ifndef ST_ACCEL_H
+#define ST_ACCEL_H
+
+#define LSM303DLH_ACCEL_DEV_NAME       "lsm303dlh_accel"
+#define LSM303DLHC_ACCEL_DEV_NAME      "lsm303dlhc_accel"
+#define LIS3DH_ACCEL_DEV_NAME          "lis3dh"
+#define LSM330D_ACCEL_DEV_NAME         "lsm330d_accel"
+#define LSM330DL_ACCEL_DEV_NAME                "lsm330dl_accel"
+#define LSM330DLC_ACCEL_DEV_NAME       "lsm330dlc_accel"
+#define LSM303D_ACCEL_DEV_NAME         "lsm303d"
+#define LSM9DS0_ACCEL_DEV_NAME         "lsm9ds0"
+#define LIS331DLH_ACCEL_DEV_NAME       "lis331dlh"
+#define LSM303DL_ACCEL_DEV_NAME                "lsm303dl_accel"
+#define LSM303DLM_ACCEL_DEV_NAME       "lsm303dlm_accel"
+#define LSM330_ACCEL_DEV_NAME          "lsm330_accel"
+
+#define ST_ACCEL_NUMBER_ALL_CHANNELS   4
+#define ST_ACCEL_NUMBER_DATA_CHANNELS  3
+#define ST_ACCEL_BYTE_FOR_CHANNEL      2
+#define ST_ACCEL_SCAN_X                        0
+#define ST_ACCEL_SCAN_Y                        1
+#define ST_ACCEL_SCAN_Z                        2
+
+/**
+ * struct st_accel_data - ST accel device status
+ * @dev: Pointer to instance of struct device (I2C or SPI).
+ * @trig: The trigger in use by the core driver.
+ * @enabled: Status of the sensor (false->off, true->on).
+ * @multiread_bit: Use or not particular bit for [I2C/SPI] multiread.
+ * @index: Number used to point the sensor being used in the
+ *     st_accel_sensors struct.
+ * @buffer_data: Data used by buffer part.
+ * @fullscale: Maximum range of measure by the sensor.
+ * @gain: Sensitivity of the sensor [m/s^2/LSB].
+ * @odr: Output data rate of the sensor [Hz].
+ * @read_byte: Function used to read one byte.
+ * @write_byte: Function used to write one byte.
+ * @read_multiple_byte: Function used to read multiple byte.
+ */
+
+struct st_accel_data {
+       struct device *dev;
+       struct iio_trigger *trig;
+
+       bool enabled;
+       bool multiread_bit;
+
+       short index;
+
+       char *buffer_data;
+
+       unsigned int fullscale;
+       unsigned int gain;
+       unsigned int odr;
+
+       int (*read_byte) (struct st_accel_data *adata, u8 reg_addr,
+                                                               u8 *res_byte);
+       int (*write_byte) (struct st_accel_data *adata, u8 reg_addr, u8 data);
+       int (*read_multiple_byte) (struct st_accel_data *adata, u8 reg_addr,
+                                                       int len, u8 *data);
+};
+
+int st_accel_iio_probe(struct iio_dev *indio_dev, int irq);
+void st_accel_iio_remove(struct iio_dev *indio_dev, int irq);
+int st_accel_set_dataready_irq(struct iio_dev *indio_dev, bool enable);
+int st_accel_set_axis_enable(struct iio_dev *indio_dev, u8 axis_enable);
+
+#ifdef CONFIG_IIO_BUFFER
+int st_accel_probe_trigger(struct iio_dev *indio_dev, int irq);
+void st_accel_remove_trigger(struct iio_dev *indio_dev, int irq);
+int st_accel_allocate_ring(struct iio_dev *indio_dev);
+void st_accel_deallocate_ring(struct iio_dev *indio_dev);
+#else /* CONFIG_IIO_BUFFER */
+static inline int st_accel_probe_trigger(struct iio_dev *indio_dev, int
irq)
+{
+       return 0;
+}
+static inline void st_accel_remove_trigger(struct iio_dev *indio_dev,
int irq)
+{
+       return;
+}
+static inline int st_accel_allocate_ring(struct iio_dev *indio_dev)
+{
+       return 0;
+}
+static inline void st_accel_deallocate_ring(struct iio_dev *indio_dev)
+{
+       return;
+}
+#endif /* CONFIG_IIO_BUFFER */
+
+#endif /* ST_ACCEL_H */
--
1.7.0.4

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