This patch add a generic library for STMicroelectronics 3-axis sensors.
Signed-off-by: Denis Ciocca <denis.ciocca@xxxxxx>
---
drivers/iio/common/Kconfig | 1 +
drivers/iio/common/Makefile | 1 +
drivers/iio/common/st_sensors/Kconfig | 6 +
drivers/iio/common/st_sensors/Makefile | 21 ++
drivers/iio/common/st_sensors/st_sensors_buffer.c | 115 ++++++
drivers/iio/common/st_sensors/st_sensors_core.c | 411 +++++++++++++++++++++
drivers/iio/common/st_sensors/st_sensors_i2c.c | 81 ++++
drivers/iio/common/st_sensors/st_sensors_spi.c | 128 +++++++
drivers/iio/common/st_sensors/st_sensors_trigger.c | 77 ++++
include/linux/iio/common/st_sensors.h | 280 ++++++++++++++
10 files changed, 1121 insertions(+)
create mode 100644 drivers/iio/common/st_sensors/Kconfig
create mode 100644 drivers/iio/common/st_sensors/Makefile
create mode 100644 drivers/iio/common/st_sensors/st_sensors_buffer.c
create mode 100644 drivers/iio/common/st_sensors/st_sensors_core.c
create mode 100644 drivers/iio/common/st_sensors/st_sensors_i2c.c
create mode 100644 drivers/iio/common/st_sensors/st_sensors_spi.c
create mode 100644 drivers/iio/common/st_sensors/st_sensors_trigger.c
create mode 100644 include/linux/iio/common/st_sensors.h
diff --git a/drivers/iio/common/Kconfig b/drivers/iio/common/Kconfig
index ed45ee5..0b6e97d 100644
--- a/drivers/iio/common/Kconfig
+++ b/drivers/iio/common/Kconfig
@@ -3,3 +3,4 @@
#
source "drivers/iio/common/hid-sensors/Kconfig"
+source "drivers/iio/common/st_sensors/Kconfig"
diff --git a/drivers/iio/common/Makefile b/drivers/iio/common/Makefile
index 8158400..c2352be 100644
--- a/drivers/iio/common/Makefile
+++ b/drivers/iio/common/Makefile
@@ -7,3 +7,4 @@
#
obj-y += hid-sensors/
+obj-y += st_sensors/
diff --git a/drivers/iio/common/st_sensors/Kconfig b/drivers/iio/common/st_sensors/Kconfig
new file mode 100644
index 0000000..0749f5c
--- /dev/null
+++ b/drivers/iio/common/st_sensors/Kconfig
@@ -0,0 +1,6 @@
+#
+# Hid Sensor common modules
+#
+
+config IIO_ST_SENSORS_CORE
+ bool
diff --git a/drivers/iio/common/st_sensors/Makefile b/drivers/iio/common/st_sensors/Makefile
new file mode 100644
index 0000000..8c9a57a
--- /dev/null
+++ b/drivers/iio/common/st_sensors/Makefile
@@ -0,0 +1,21 @@
+#
+# Makefile for the STMicroelectronics sensor common modules.
+#
+
+ifneq ($(CONFIG_I2C),)
+st_accel_i2c = st_sensors_i2c.o
+endif
+
+ifneq ($(CONFIG_SPI_MASTER),)
+st_accel_spi = st_sensors_spi.o
+endif
+
+ifneq ($(CONFIG_IIO_BUFFER),)
+st_sensors_triggered_buffer = st_sensors_trigger.o st_sensors_buffer.o
+endif
+
+obj-$(CONFIG_IIO_ST_SENSORS_CORE) += st_sensors_library.o
+st_sensors_library-y := st_sensors_core.o \
+ $(st_accel_i2c) \
+ $(st_accel_spi) \
+ $(st_sensors_triggered_buffer)
diff --git a/drivers/iio/common/st_sensors/st_sensors_buffer.c b/drivers/iio/common/st_sensors/st_sensors_buffer.c
new file mode 100644
index 0000000..f4a5adc
--- /dev/null
+++ b/drivers/iio/common/st_sensors/st_sensors_buffer.c
@@ -0,0 +1,115 @@
+/*
+ * STMicroelectronics sensors buffer library driver
+ *
+ * Copyright 2012-2013 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/iio/iio.h>
+#include <linux/iio/trigger.h>
+#include <linux/interrupt.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/irqreturn.h>
+
+#include <linux/iio/common/st_sensors.h>
+
+int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf)
+{
+ int i, n = 0, len;
+ u8 addr[ST_SENSORS_NUMBER_DATA_CHANNELS];
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ for (i = 0; i < ST_SENSORS_NUMBER_DATA_CHANNELS; i++) {
+ if (test_bit(i, indio_dev->active_scan_mask)) {
+ addr[n] = indio_dev->channels[i].address;
+ n++;
+ }
+ }
+ switch (n) {
+ case 1:
+ len = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev,
+ addr[0], ST_SENSORS_BYTE_FOR_CHANNEL, buf,
+ sdata->multiread_bit);
+ break;
+ case 2:
+ if ((addr[1] - addr[0]) == ST_SENSORS_BYTE_FOR_CHANNEL) {
+ len = sdata->tf->read_multiple_byte(&sdata->tb,
+ sdata->dev, addr[0],
+ ST_SENSORS_BYTE_FOR_CHANNEL*n,
+ buf, sdata->multiread_bit);
+ } else {
+ u8 rx_array[ST_SENSORS_BYTE_FOR_CHANNEL*
+ ST_SENSORS_NUMBER_DATA_CHANNELS];
+ len = sdata->tf->read_multiple_byte(&sdata->tb,
+ sdata->dev, addr[0],
+ ST_SENSORS_BYTE_FOR_CHANNEL*
+ ST_SENSORS_NUMBER_DATA_CHANNELS,
+ rx_array, sdata->multiread_bit);
+ if (len < 0)
+ goto read_data_channels_error;
+
+ for (i = 0; i < n * ST_SENSORS_NUMBER_DATA_CHANNELS;
+ i++) {
+ if (i < n)
+ buf[i] = rx_array[i];
+ else
+ buf[i] = rx_array[n + i];
+ }
+ len = ST_SENSORS_BYTE_FOR_CHANNEL*n;
+ }
+ break;
+ case 3:
+ len = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev,
+ addr[0], ST_SENSORS_BYTE_FOR_CHANNEL*
+ ST_SENSORS_NUMBER_DATA_CHANNELS,
+ buf, sdata->multiread_bit);
+ break;
+ default:
+ len = -EINVAL;
+ goto read_data_channels_error;
+ }
+ if (len != ST_SENSORS_BYTE_FOR_CHANNEL*n) {
+ len = -EIO;
+ goto read_data_channels_error;
+ }
+
+read_data_channels_error:
+ return len;
+}
+EXPORT_SYMBOL(st_sensors_get_buffer_element);
+
+irqreturn_t st_sensors_trigger_handler(int irq, void *p)
+{
+ int len;
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ len = st_sensors_get_buffer_element(indio_dev, sdata->buffer_data);
+ if (len < 0)
+ goto st_sensors_get_buffer_element_error;
+
+ if (indio_dev->scan_timestamp)
+ *(s64 *)((u8 *)sdata->buffer_data +
+ ALIGN(len, sizeof(s64))) = pf->timestamp;
+
+ iio_push_to_buffers(indio_dev, sdata->buffer_data);
+
+st_sensors_get_buffer_element_error:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+EXPORT_SYMBOL(st_sensors_trigger_handler);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@xxxxxx>");
+MODULE_DESCRIPTION("STMicroelectronics ST-sensors buffer");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/common/st_sensors/st_sensors_core.c b/drivers/iio/common/st_sensors/st_sensors_core.c
new file mode 100644
index 0000000..661cc2b
--- /dev/null
+++ b/drivers/iio/common/st_sensors/st_sensors_core.c
@@ -0,0 +1,411 @@
+/*
+ * STMicroelectronics sensors core library driver
+ *
+ * Copyright 2012-2013 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/delay.h>
+#include <linux/unaligned/le_byteshift.h>
+#include <linux/iio/iio.h>
+
+#include <linux/iio/common/st_sensors.h>
+
+
+#define ST_SENSORS_WAI_ADDRESS 0x0f
+
+int st_sensors_write_data_with_mask(struct iio_dev *indio_dev,
+ u8 reg_addr, u8 mask, u8 data)
+{
+ int err;
+ u8 new_data;
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ err = sdata->tf->read_byte(&sdata->tb, sdata->dev, reg_addr, &new_data);
+ if (err < 0)
+ goto st_sensors_write_data_with_mask_error;
+
+ new_data = ((new_data & (~mask)) | ((data << __ffs(mask)) & mask));
+ err = sdata->tf->write_byte(&sdata->tb, sdata->dev, reg_addr, new_data);
+
+st_sensors_write_data_with_mask_error:
+ return err;
+}
+EXPORT_SYMBOL(st_sensors_write_data_with_mask);
+
+int st_sensors_get_sampling_frequency_avl(struct iio_dev *indio_dev,
+ const struct st_sensor_odr_avl *odr_avl, char *buf)
+{
+ int i, len = 0;
+
+ mutex_lock(&indio_dev->mlock);
+ for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
+ if (odr_avl[i].hz == 0)
+ break;
+
+ len += scnprintf(buf + len, PAGE_SIZE - len,
+ "%d ", odr_avl[i].hz);
+ }
+ mutex_unlock(&indio_dev->mlock);
+ buf[len - 1] = '\n';
+
+ return len;
+}
+EXPORT_SYMBOL(st_sensors_get_sampling_frequency_avl);
+
+int st_sensors_get_scale_avl(struct iio_dev *indio_dev,
+ const struct st_sensor_fullscale_avl *fullscale_avl, char *buf)
+{
+ int i, len = 0;
+
+ mutex_lock(&indio_dev->mlock);
+ for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
+ if (fullscale_avl[i].num == 0)
+ break;
+
+ len += scnprintf(buf + len, PAGE_SIZE - len,
+ "0.%06u ", fullscale_avl[i].gain);
+ }
+ mutex_unlock(&indio_dev->mlock);
+ buf[len - 1] = '\n';
+
+ return len;
+}
+EXPORT_SYMBOL(st_sensors_get_scale_avl);
+
+static int st_sensors_match_odr(const struct st_sensors *sensor,
+ unsigned int odr, struct st_sensor_odr_avl *odr_out)
+{
+ int i, ret = -EINVAL;
+
+ for (i = 0; i < ST_SENSORS_ODR_LIST_MAX; i++) {
+ if (sensor->odr.odr_avl[i].hz == 0)
+ goto st_sensors_match_odr_error;
+
+ 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;
+ }
+ }
+
+st_sensors_match_odr_error:
+ return ret;
+}
+
+int st_sensors_set_odr(struct iio_dev *indio_dev,
+ const struct st_sensors *sensor, unsigned int odr)
+{
+ int err;
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+ struct st_sensor_odr_avl odr_out;
+
+ err = st_sensors_match_odr(sensor, odr, &odr_out);
+ if (err < 0)
+ goto st_sensors_match_odr_error;
+
+ if ((sensor->odr.addr == sensor->pw.addr) &&
+ (sensor->odr.mask == sensor->pw.mask)) {
+ if (sdata->enabled == true) {
+ err = st_sensors_write_data_with_mask(indio_dev,
+ sensor->odr.addr, sensor->odr.mask,
+ odr_out.value);
+ } else {
+ err = 0;
+ }
+ } else {
+ err = st_sensors_write_data_with_mask(indio_dev,
+ sensor->odr.addr, sensor->odr.mask, odr_out.value);
+ }
+ if (err >= 0)
+ sdata->odr = odr_out.hz;
+
+st_sensors_match_odr_error:
+ return err;
+}
+EXPORT_SYMBOL(st_sensors_set_odr);
+
+static int st_sensors_match_fs(const struct st_sensors *sensor,
+ unsigned int fs, int *index_fs_avl)
+{
+ int i, ret = -EINVAL;
+
+ for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
+ if (sensor->fs.fs_avl[i].num == 0)
+ goto st_sensors_match_odr_error;
+
+ if (sensor->fs.fs_avl[i].num == fs) {
+ *index_fs_avl = i;
+ ret = 0;
+ break;
+ }
+ }
+
+st_sensors_match_odr_error:
+ return ret;
+}
+
+int st_sensors_set_fullscale(struct iio_dev *indio_dev,
+ const struct st_sensors *sensor, unsigned int fs)
+{
+ int err, i;
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ err = st_sensors_match_fs(sensor, fs, &i);
+ if (err < 0)
+ goto st_accel_set_fullscale_error;
+
+ err = st_sensors_write_data_with_mask(indio_dev,
+ sensor->fs.addr, sensor->fs.mask, sensor->fs.fs_avl[i].value);
+ if (err < 0)
+ goto st_accel_set_fullscale_error;
+
+ sdata->current_fullscale = (struct st_sensor_fullscale_avl *)
+ &sensor->fs.fs_avl[i];
+ return err;
+
+st_accel_set_fullscale_error:
+ dev_err(&indio_dev->dev, "failed to set new fullscale.\n");
+ return err;
+}
+EXPORT_SYMBOL(st_sensors_set_fullscale);
+
+int st_sensors_set_enable(struct iio_dev *indio_dev,
+ const struct st_sensors *sensor, bool enable)
+{
+ int err = -EINVAL;
+ bool found;
+ u8 tmp_value;
+ struct st_sensor_odr_avl odr_out;
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ if (enable) {
+ found = false;
+ tmp_value = sensor->pw.value_on;
+ if ((sensor->odr.addr == sensor->pw.addr) &&
+ (sensor->odr.mask == sensor->pw.mask)) {
+ err = st_sensors_match_odr(sensor,
+ sdata->odr, &odr_out);
+ if (err < 0)
+ goto set_enable_error;
+ tmp_value = odr_out.value;
+ found = true;
+ }
+ err = st_sensors_write_data_with_mask(indio_dev,
+ sensor->pw.addr, sensor->pw.mask, tmp_value);
+ if (err < 0)
+ goto set_enable_error;
+ sdata->enabled = true;
+ if (found)
+ sdata->odr = odr_out.hz;
+ } else {
+ err = st_sensors_write_data_with_mask(indio_dev,
+ sensor->pw.addr, sensor->pw.mask,
+ sensor->pw.value_off);
+ if (err < 0)
+ goto set_enable_error;
+ sdata->enabled = false;
+ }
+
+set_enable_error:
+ return err;
+}
+EXPORT_SYMBOL(st_sensors_set_enable);
+
+int st_sensors_set_axis_enable(struct iio_dev *indio_dev,
+ const struct st_sensors *sensor, u8 axis_enable)
+{
+ return st_sensors_write_data_with_mask(indio_dev,
+ sensor->enable_axis.addr,
+ sensor->enable_axis.mask, axis_enable);
+}
+EXPORT_SYMBOL(st_sensors_set_axis_enable);
+
+int st_sensors_init_sensor(struct iio_dev *indio_dev,
+ const struct st_sensors *sensor)
+{
+ int err;
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ mutex_init(&sdata->tb.buf_lock);
+
+ err = st_sensors_set_enable(indio_dev, sensor, false);
+ if (err < 0)
+ goto init_error;
+
+ err = st_sensors_set_fullscale(indio_dev, sensor,
+ sdata->current_fullscale->num);
+ if (err < 0)
+ goto init_error;
+
+ err = st_sensors_set_odr(indio_dev, sensor, sdata->odr);
+ if (err < 0)
+ goto init_error;
+
+ /* set BDU */
+ err = st_sensors_write_data_with_mask(indio_dev, sensor->bdu.addr,
+ sensor->bdu.mask, true);
+ if (err < 0)
+ goto init_error;
+
+ err = st_sensors_set_axis_enable(indio_dev, sensor,
+ ST_SENSORS_ENABLE_ALL_CHANNELS);
+
+init_error:
+ return err;
+}
+EXPORT_SYMBOL(st_sensors_init_sensor);
+
+int st_sensors_set_dataready_irq(struct iio_dev *indio_dev,
+ const struct st_sensors *sensor, bool enable)
+{
+ int err;
+
+ /* Enable/Disable the interrupt generator 1. */
+ if (sensor->drdy_irq.ig1.en_addr > 0) {
+ err = st_sensors_write_data_with_mask(indio_dev,
+ sensor->drdy_irq.ig1.en_addr,
+ sensor->drdy_irq.ig1.en_mask, (int)enable);
+ if (err < 0)
+ goto st_accel_set_dataready_irq_error;
+ }
+
+ /* Enable/Disable the interrupt generator for data ready. */
+ err = st_sensors_write_data_with_mask(indio_dev,
+ sensor->drdy_irq.addr,
+ sensor->drdy_irq.mask, (int)enable);
+
+st_accel_set_dataready_irq_error:
+ return err;
+}
+EXPORT_SYMBOL(st_sensors_set_dataready_irq);
+
+int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev,
+ const struct st_sensors *sensor, int scale)
+{
+ int err = -EINVAL, i;
+
+ for (i = 0; i < ST_SENSORS_FULLSCALE_AVL_MAX; i++) {
+ if ((sensor->fs.fs_avl[i].gain == scale) &&
+ (sensor->fs.fs_avl[i].gain != 0)) {
+ err = 0;
+ break;
+ }
+ }
+ if (err < 0)
+ goto st_sensors_match_scale_error;
+
+ err = st_sensors_set_fullscale(indio_dev,
+ sensor, sensor->fs.fs_avl[i].num);
+
+st_sensors_match_scale_error:
+ return err;
+}
+EXPORT_SYMBOL(st_sensors_set_fullscale_by_gain);
+
+static int st_sensors_read_axis_data(struct iio_dev *indio_dev,
+ u8 ch_addr, int *data)
+{
+ int err;
+ u8 outdata[ST_SENSORS_BYTE_FOR_CHANNEL];
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ err = sdata->tf->read_multiple_byte(&sdata->tb, sdata->dev,
+ ch_addr, ST_SENSORS_BYTE_FOR_CHANNEL,
+ outdata, sdata->multiread_bit);
+ if (err < 0)
+ goto read_error;
+
+ *data = (s16)get_unaligned_le16(outdata);
+
+read_error:
+ return err;
+}
+
+int st_sensors_read_info_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *ch, int *val,
+ const struct st_sensors *sensor)
+{
+ int err;
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ mutex_lock(&indio_dev->mlock);
+ if (indio_dev->currentmode == INDIO_BUFFER_TRIGGERED) {
+ err = -EBUSY;
+ goto read_error;
+ } else {
+ err = st_sensors_set_enable(indio_dev, sensor, true);
+ if (err < 0)
+ goto read_error;
+
+ msleep((sensor->bootime * 1000) / sdata->odr);
+ err = st_sensors_read_axis_data(indio_dev, ch->address, val);
+ if (err < 0)
+ goto read_error;
+
+ *val = *val >> ch->scan_type.shift;
+ }
+ mutex_unlock(&indio_dev->mlock);
+
+ return err;
+
+read_error:
+ mutex_unlock(&indio_dev->mlock);
+ return err;
+}
+EXPORT_SYMBOL(st_sensors_read_info_raw);
+
+int st_sensors_check_device_support(struct iio_dev *indio_dev,
+ int num_sensors_list, const struct st_sensors *sensors)
+{
+ int i, n, err;
+ u8 wai;
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ err = sdata->tf->read_byte(&sdata->tb, sdata->dev,
+ ST_SENSORS_DEFAULT_WAI_ADDRESS, &wai);
+ if (err < 0) {
+ dev_err(&indio_dev->dev, "failed to read Who-Am-I register.\n");
+ goto read_wai_error;
+ }
+
+ for (i = 0; i < num_sensors_list; i++) {
+ if (sensors[i].wai == wai)
+ break;
+ }
+ if (i == num_sensors_list)
+ goto device_not_supported;
+
+ for (n = 0; n < ARRAY_SIZE(sensors[i].sensors_supported); n++) {
+ if (strcmp(indio_dev->name,
+ &sensors[i].sensors_supported[n][0]) == 0)
+ break;
+ }
+ if (n == ARRAY_SIZE(sensors[i].sensors_supported)) {
+ dev_err(&indio_dev->dev, "device name and WhoAmI mismatch.\n");
+ goto sensor_name_mismatch;
+ }
+
+ sdata->index = i;
+
+ return i;
+
+device_not_supported:
+ dev_err(&indio_dev->dev, "device not supported: WhoAmI (0x%x).\n", wai);
+sensor_name_mismatch:
+ err = -ENODEV;
+read_wai_error:
+ return err;
+}
+EXPORT_SYMBOL(st_sensors_check_device_support);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@xxxxxx>");
+MODULE_DESCRIPTION("STMicroelectronics ST-sensors core");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/common/st_sensors/st_sensors_i2c.c b/drivers/iio/common/st_sensors/st_sensors_i2c.c
new file mode 100644
index 0000000..b2d2fdf
--- /dev/null
+++ b/drivers/iio/common/st_sensors/st_sensors_i2c.c
@@ -0,0 +1,81 @@
+/*
+ * STMicroelectronics sensors i2c library driver
+ *
+ * Copyright 2012-2013 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/iio/iio.h>
+
+#include <linux/iio/common/st_sensors.h>
+
+
+#define ST_SENSORS_I2C_MULTIREAD 0x80
+
+unsigned int st_sensors_i2c_get_irq(struct iio_dev *indio_dev)
+{
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ return to_i2c_client(sdata->dev)->irq;
+}
+
+static int st_sensors_i2c_read_byte(struct st_sensor_transfer_buffer *tb,
+ struct device *dev, u8 reg_addr, u8 *res_byte)
+{
+ int err;
+
+ err = i2c_smbus_read_byte_data(to_i2c_client(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_sensors_i2c_read_multiple_byte(
+ struct st_sensor_transfer_buffer *tb, struct device *dev,
+ u8 reg_addr, int len, u8 *data, bool multiread_bit)
+{
+ if (multiread_bit == true)
+ reg_addr |= ST_SENSORS_I2C_MULTIREAD;
+
+ return i2c_smbus_read_i2c_block_data(to_i2c_client(dev),
+ reg_addr, len, data);
+}
+
+static int st_sensors_i2c_write_byte(struct st_sensor_transfer_buffer *tb,
+ struct device *dev, u8 reg_addr, u8 data)
+{
+ return i2c_smbus_write_byte_data(to_i2c_client(dev), reg_addr, data);
+}
+
+static const struct st_sensor_transfer_function st_sensors_tf_i2c = {
+ .read_byte = st_sensors_i2c_read_byte,
+ .write_byte = st_sensors_i2c_write_byte,
+ .read_multiple_byte = st_sensors_i2c_read_multiple_byte,
+};
+
+void st_sensors_i2c_configure(struct iio_dev *indio_dev,
+ struct i2c_client *client, struct st_sensor_data *sdata)
+{
+ i2c_set_clientdata(client, indio_dev);
+
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->name = client->name;
+
+ sdata->tf = &st_sensors_tf_i2c;
+ sdata->get_irq_data_ready = st_sensors_i2c_get_irq;
+}
+EXPORT_SYMBOL(st_sensors_i2c_configure);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@xxxxxx>");
+MODULE_DESCRIPTION("STMicroelectronics ST-sensors i2c driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/common/st_sensors/st_sensors_spi.c b/drivers/iio/common/st_sensors/st_sensors_spi.c
new file mode 100644
index 0000000..5030766
--- /dev/null
+++ b/drivers/iio/common/st_sensors/st_sensors_spi.c
@@ -0,0 +1,128 @@
+/*
+ * STMicroelectronics sensors spi library driver
+ *
+ * Copyright 2012-2013 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/iio/iio.h>
+
+#include <linux/iio/common/st_sensors.h>
+
+
+#define ST_SENSORS_SPI_MULTIREAD 0xc0
+#define ST_SENSORS_SPI_READ 0x80
+
+unsigned int st_sensors_spi_get_irq(struct iio_dev *indio_dev)
+{
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ return to_spi_device(sdata->dev)->irq;
+}
+
+static int st_sensors_spi_read(struct st_sensor_transfer_buffer *tb,
+ struct device *dev, u8 reg_addr, int len, u8 *data, bool multiread_bit)
+{
+ struct spi_message msg;
+ int err;
+
+ struct spi_transfer xfers[] = {
+ {
+ .tx_buf = tb->tx_buf,
+ .bits_per_word = 8,
+ .len = 1,
+ },
+ {
+ .rx_buf = tb->rx_buf,
+ .bits_per_word = 8,
+ .len = len,
+ }
+ };
+
+ mutex_lock(&tb->buf_lock);
+ if ((multiread_bit == true) && (len > 1))
+ tb->tx_buf[0] = reg_addr | ST_SENSORS_SPI_MULTIREAD;
+ else
+ tb->tx_buf[0] = reg_addr | ST_SENSORS_SPI_READ;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfers[0], &msg);
+ spi_message_add_tail(&xfers[1], &msg);
+ err = spi_sync(to_spi_device(dev), &msg);
+ if (err)
+ goto acc_spi_read_error;
+
+ memcpy(data, tb->rx_buf, len*sizeof(u8));
+ mutex_unlock(&tb->buf_lock);
+ return len;
+
+acc_spi_read_error:
+ mutex_unlock(&tb->buf_lock);
+ return err;
+}
+
+static int st_sensors_spi_read_byte(struct st_sensor_transfer_buffer *tb,
+ struct device *dev, u8 reg_addr, u8 *res_byte)
+{
+ return st_sensors_spi_read(tb, dev, reg_addr, 1, res_byte, false);
+}
+
+static int st_sensors_spi_read_multiple_byte(
+ struct st_sensor_transfer_buffer *tb, struct device *dev,
+ u8 reg_addr, int len, u8 *data, bool multiread_bit)
+{
+ return st_sensors_spi_read(tb, dev, reg_addr, len, data, multiread_bit);
+}
+
+static int st_sensors_spi_write_byte(struct st_sensor_transfer_buffer *tb,
+ struct device *dev, u8 reg_addr, u8 data)
+{
+ struct spi_message msg;
+ int err;
+
+ struct spi_transfer xfers = {
+ .tx_buf = tb->tx_buf,
+ .bits_per_word = 8,
+ .len = 2,
+ };
+
+ mutex_lock(&tb->buf_lock);
+ tb->tx_buf[0] = reg_addr;
+ tb->tx_buf[1] = data;
+
+ spi_message_init(&msg);
+ spi_message_add_tail(&xfers, &msg);
+ err = spi_sync(to_spi_device(dev), &msg);
+ mutex_unlock(&tb->buf_lock);
+
+ return err;
+}
+
+static const struct st_sensor_transfer_function st_sensors_tf_spi = {
+ .read_byte = st_sensors_spi_read_byte,
+ .write_byte = st_sensors_spi_write_byte,
+ .read_multiple_byte = st_sensors_spi_read_multiple_byte,
+};
+
+void st_sensors_spi_configure(struct iio_dev *indio_dev,
+ struct spi_device *spi, struct st_sensor_data *sdata)
+{
+ spi_set_drvdata(spi, indio_dev);
+
+ indio_dev->dev.parent = &spi->dev;
+ indio_dev->name = spi->modalias;
+
+ sdata->tf = &st_sensors_tf_spi;
+ sdata->get_irq_data_ready = st_sensors_spi_get_irq;
+}
+EXPORT_SYMBOL(st_sensors_spi_configure);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@xxxxxx>");
+MODULE_DESCRIPTION("STMicroelectronics ST-sensors spi driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/common/st_sensors/st_sensors_trigger.c b/drivers/iio/common/st_sensors/st_sensors_trigger.c
new file mode 100644
index 0000000..9c62c6a
--- /dev/null
+++ b/drivers/iio/common/st_sensors/st_sensors_trigger.c
@@ -0,0 +1,77 @@
+/*
+ * STMicroelectronics sensors trigger library driver
+ *
+ * Copyright 2012-2013 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/iio/iio.h>
+#include <linux/iio/trigger.h>
+#include <linux/interrupt.h>
+
+#include <linux/iio/common/st_sensors.h>
+
+
+int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
+ struct iio_trigger_ops *trigger_ops)
+{
+ int err;
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ sdata->trig = iio_trigger_alloc("%s-trigger", indio_dev->name);
+ if (sdata->trig == NULL) {
+ err = -ENOMEM;
+ dev_err(&indio_dev->dev, "failed to allocate iio trigger.\n");
+ goto iio_trigger_alloc_error;
+ }
+
+ err = request_threaded_irq(sdata->get_irq_data_ready(indio_dev),
+ iio_trigger_generic_data_rdy_poll,
+ NULL,
+ IRQF_TRIGGER_RISING,
+ sdata->trig->name,
+ sdata->trig);
+ if (err)
+ goto request_irq_error;
+
+ sdata->trig->private_data = indio_dev;
+ sdata->trig->ops = trigger_ops;
+ sdata->trig->dev.parent = sdata->dev;
+
+ err = iio_trigger_register(sdata->trig);
+ if (err < 0) {
+ dev_err(&indio_dev->dev, "failed to register iio trigger.\n");
+ goto iio_trigger_register_error;
+ }
+ indio_dev->trig = sdata->trig;
+
+ return 0;
+
+iio_trigger_register_error:
+ free_irq(sdata->get_irq_data_ready(indio_dev), sdata->trig);
+request_irq_error:
+ iio_trigger_free(sdata->trig);
+iio_trigger_alloc_error:
+ return err;
+}
+EXPORT_SYMBOL(st_sensors_allocate_trigger);
+
+void st_sensors_deallocate_trigger(struct iio_dev *indio_dev)
+{
+ struct st_sensor_data *sdata = iio_priv(indio_dev);
+
+ iio_trigger_unregister(sdata->trig);
+ free_irq(sdata->get_irq_data_ready(indio_dev), sdata->trig);
+ iio_trigger_free(sdata->trig);
+}
+EXPORT_SYMBOL(st_sensors_deallocate_trigger);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@xxxxxx>");
+MODULE_DESCRIPTION("STMicroelectronics ST-sensors trigger");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/iio/common/st_sensors.h b/include/linux/iio/common/st_sensors.h
new file mode 100644
index 0000000..a8a0c40
--- /dev/null
+++ b/include/linux/iio/common/st_sensors.h
@@ -0,0 +1,280 @@
+/*
+ * STMicroelectronics sensors library driver
+ *
+ * Copyright 2012-2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@xxxxxx>
+ *
+ * Licensed under the GPL-2.
+ */
+
+#ifndef ST_SENSORS_H
+#define ST_SENSORS_H
+
+#include <linux/i2c.h>
+#include <linux/spi/spi.h>
+#include <linux/irqreturn.h>
+#include <linux/iio/trigger.h>
+
+
+#define ST_SENSORS_TX_MAX_LENGHT 2
+#define ST_SENSORS_RX_MAX_LENGHT 6
+
+#define ST_SENSORS_ODR_LIST_MAX 10
+#define ST_SENSORS_FULLSCALE_AVL_MAX 10
+
+#define ST_SENSORS_NUMBER_ALL_CHANNELS 4
+#define ST_SENSORS_NUMBER_DATA_CHANNELS 3
+#define ST_SENSORS_ENABLE_ALL_CHANNELS 0x07
+#define ST_SENSORS_BYTE_FOR_CHANNEL 2
+#define ST_SENSORS_SCAN_X 0
+#define ST_SENSORS_SCAN_Y 1
+#define ST_SENSORS_SCAN_Z 2
+#define ST_SENSORS_DEFAULT_12_REALBITS 12
+#define ST_SENSORS_DEFAULT_16_REALBITS 16
+#define ST_SENSORS_DEFAULT_POWER_ON_VALUE 0x01
+#define ST_SENSORS_DEFAULT_POWER_OFF_VALUE 0x00
+#define ST_SENSORS_DEFAULT_WAI_ADDRESS 0x0f
+#define ST_SENSORS_DEFAULT_AXIS_ADDR 0x20
+#define ST_SENSORS_DEFAULT_AXIS_MASK 0x07
+#define ST_SENSORS_DEFAULT_AXIS_N_BIT 3
+
+#define ST_SENSORS_MAX_NAME 17
+#define ST_SENSORS_MAX_4WAI 7
+
+#define ST_SENSORS_LSM_CHANNELS(device_type, index, mod, endian, bits, addr) \
+{ \
+ .type = device_type, \
+ .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, \
+ }, \
+}
+
+struct st_sensor_odr_avl {
+ unsigned int hz;
+ u8 value;
+};
+
+struct st_sensor_odr {
+ u8 addr;
+ u8 mask;
+ struct st_sensor_odr_avl odr_avl[ST_SENSORS_ODR_LIST_MAX];
+};
+
+struct st_sensor_power {
+ u8 addr;
+ u8 mask;
+ u8 value_off;
+ u8 value_on;
+};
+
+struct st_sensor_axis {
+ u8 addr;
+ u8 mask;
+};
+
+struct st_sensor_fullscale_avl {
+ unsigned int num;
+ u8 value;
+ unsigned int gain;
+ unsigned int gain2;
+};
+
+struct st_sensor_fullscale {
+ u8 addr;
+ u8 mask;
+ struct st_sensor_fullscale_avl fs_avl[ST_SENSORS_FULLSCALE_AVL_MAX];
+};
+
+/**
+ * struct st_sensor_bdu - ST sensor device block data update
+ * @addr: address of the register.
+ * @mask: mask to write the block data update flag.
+ */
+struct st_sensor_bdu {
+ u8 addr;
+ u8 mask;
+};
+
+/**
+ * struct st_sensor_data_ready_irq - ST sensor device data-ready interrupt
+ * @addr: address of the register.
+ * @mask: mask to write the on/off value.
+ * struct ig1 - represents the Interrupt Generator 1 of sensors.
+ * @en_addr: address of the enable ig1 register.
+ * @en_mask: mask to write the on/off value for enable.
+ */
+struct st_sensor_data_ready_irq {
+ u8 addr;
+ u8 mask;
+ struct {
+ u8 en_addr;
+ u8 en_mask;
+ } ig1;
+};
+
+/**
+ * struct st_sensor_transfer_buffer - ST sensor device I/O buffer
+ * @buf_lock: Mutex to protect rx and tx buffers.
+ * @tx_buf: Buffer used by SPI transfer function to send data to the sensors.
+ * This buffer is used to avoid DMA not-aligned issue.
+ * @rx_buf: Buffer used by SPI transfer to receive data from sensors.
+ * This buffer is used to avoid DMA not-aligned issue.
+ */
+struct st_sensor_transfer_buffer {
+ struct mutex buf_lock;
+ u8 rx_buf[ST_SENSORS_RX_MAX_LENGHT];
+ u8 tx_buf[ST_SENSORS_TX_MAX_LENGHT] ____cacheline_aligned;
+};
+
+/**
+ * struct st_sensor_transfer_function - ST sensor device I/O function
+ * @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_sensor_transfer_function {
+ int (*read_byte) (struct st_sensor_transfer_buffer *tb,
+ struct device *dev, u8 reg_addr, u8 *res_byte);
+ int (*write_byte) (struct st_sensor_transfer_buffer *tb,
+ struct device *dev, u8 reg_addr, u8 data);
+ int (*read_multiple_byte) (struct st_sensor_transfer_buffer *tb,
+ struct device *dev, u8 reg_addr, int len, u8 *data,
+ bool multiread_bit);
+};
+
+/**
+ * struct st_sensor_data - ST sensor device status
+ * @dev: Pointer to instance of struct device (I2C or SPI).
+ * @trig: The trigger in use by the core driver.
+ * @current_fullscale: Maximum range of measure by the sensor.
+ * @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_sensors struct.
+ * @buffer_data: Data used by buffer part.
+ * @odr: Output data rate of the sensor [Hz].
+ * @get_irq_data_ready: Function to get the IRQ used for data ready signal.
+ * @tf: Transfer function structure used by I/O operations.
+ * @tb: Transfer buffers and mutex used by I/O operations.
+ */
+struct st_sensor_data {
+ struct device *dev;
+ struct iio_trigger *trig;
+ struct st_sensor_fullscale_avl *current_fullscale;
+
+ bool enabled;
+ bool multiread_bit;
+
+ short index;
+
+ char *buffer_data;
+
+ unsigned int odr;
+
+ unsigned int (*get_irq_data_ready) (struct iio_dev *indio_dev);
+
+ const struct st_sensor_transfer_function *tf;
+ struct st_sensor_transfer_buffer tb;
+};
+
+/**
+ * struct st_sensors - ST sensors list
+ * @wai: Contents of WhoAmI register.
+ * @sensors_supported: List of supported sensors by struct itself.
+ * @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 full scale 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] multi-read.
+ * @bootime: samples to discard when sensor passing from power-down to power-up.
+ */
+struct st_sensors {
+ u8 wai;
+ char sensors_supported[ST_SENSORS_MAX_4WAI][ST_SENSORS_MAX_NAME];
+ struct iio_chan_spec *ch;
+ struct st_sensor_odr odr;
+ struct st_sensor_power pw;
+ struct st_sensor_axis enable_axis;
+ struct st_sensor_fullscale fs;
+ struct st_sensor_bdu bdu;
+ struct st_sensor_data_ready_irq drdy_irq;
+ bool multi_read_bit;
+ unsigned int bootime;
+};
+
+#ifdef CONFIG_SPI_MASTER
+void st_sensors_spi_configure(struct iio_dev *indio_dev,
+ struct spi_device *spi, struct st_sensor_data *sdata);
+
+unsigned int st_sensors_spi_get_irq(struct iio_dev *indio_dev);
+#endif
+
+#ifdef CONFIG_I2C
+void st_sensors_i2c_configure(struct iio_dev *indio_dev,
+ struct i2c_client *client, struct st_sensor_data *sdata);
+
+unsigned int st_sensors_i2c_get_irq(struct iio_dev *indio_dev);
+#endif
+
+#ifdef CONFIG_IIO_BUFFER
+int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
+ struct iio_trigger_ops *trigger_ops);
+
+void st_sensors_deallocate_trigger(struct iio_dev *indio_dev);
+
+irqreturn_t st_sensors_trigger_handler(int irq, void *p);
+
+int st_sensors_get_buffer_element(struct iio_dev *indio_dev, u8 *buf);
+#endif
+
+int st_sensors_init_sensor(struct iio_dev *indio_dev,
+ const struct st_sensors *sensor);
+
+int st_sensors_set_enable(struct iio_dev *indio_dev,
+ const struct st_sensors *sensor, bool enable);
+
+int st_sensors_set_axis_enable(struct iio_dev *indio_dev,
+ const struct st_sensors *sensor, u8 axis_enable);
+
+int st_sensors_write_data_with_mask(struct iio_dev *indio_dev,
+ u8 reg_addr, u8 mask, u8 data);
+
+int st_sensors_get_sampling_frequency_avl(struct iio_dev *indio_dev,
+ const struct st_sensor_odr_avl *odr_avl, char *buf);
+
+int st_sensors_get_scale_avl(struct iio_dev *indio_dev,
+ const struct st_sensor_fullscale_avl *fullscale_avl, char *buf);
+
+int st_sensors_set_fullscale(struct iio_dev *indio_dev,
+ const struct st_sensors *sensor, unsigned int fs);
+
+int st_sensors_set_odr(struct iio_dev *indio_dev,
+ const struct st_sensors *sensor, unsigned int odr);
+
+int st_sensors_set_dataready_irq(struct iio_dev *indio_dev,
+ const struct st_sensors *sensor, bool enable);
+
+int st_sensors_set_fullscale_by_gain(struct iio_dev *indio_dev,
+ const struct st_sensors *sensor, int scale);
+
+int st_sensors_read_info_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *ch, int *val,
+ const struct st_sensors *sensor);
+
+int st_sensors_check_device_support(struct iio_dev *indio_dev,
+ int num_sensors_list, const struct st_sensors *sensors);
+
+#endif /* ST_SENSORS_H */
--
1.8.0.3
--
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