iio:pressure: Add STMicroelectronics pressures driver

This patch adds a generic pressure driver for STMicroelectronics
pressure sensors, currently it supports: LPS331AP.

Signed-off-by: Denis Ciocca <denis.ciocca@st.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

7 files changed, 614 insertions, 0 deletions

diff --git a/drivers/iio/pressure/Kconfig b/drivers/iio/pressure/Kconfig
new file mode 100644
index 000000000000..9427f01e1499
--- /dev/null
+++ b/drivers/iio/pressure/Kconfig
@@ -0,0 +1,35 @@
+#
+# Pressure drivers
+#
+menu "Pressure Sensors"
+
+config IIO_ST_PRESS
+        tristate "STMicroelectronics pressures Driver"
+        depends on (I2C || SPI_MASTER) && SYSFS
+        select IIO_ST_SENSORS_CORE
+        select IIO_ST_PRESS_I2C if (I2C)
+        select IIO_ST_PRESS_SPI if (SPI_MASTER)
+        select IIO_TRIGGERED_BUFFER if (IIO_BUFFER)
+        help
+          Say yes here to build support for STMicroelectronics pressures:
+          LPS331AP.
+
+          This driver can also be built as a module. If so, will be created
+          these modules:
+          - st_pressure (core functions for the driver [it is mandatory]);
+          - st_pressure_i2c (necessary for the I2C devices [optional*]);
+          - st_pressure_spi (necessary for the SPI devices [optional*]);
+
+          (*) one of these is necessary to do something.
+
+config IIO_ST_PRESS_I2C
+        tristate
+        depends on IIO_ST_PRESS
+        depends on IIO_ST_SENSORS_I2C
+
+config IIO_ST_PRESS_SPI
+        tristate
+        depends on IIO_ST_PRESS
+        depends on IIO_ST_SENSORS_SPI
+
+endmenu
diff --git a/drivers/iio/pressure/Makefile b/drivers/iio/pressure/Makefile
new file mode 100644
index 000000000000..d4bb33e5c846
--- /dev/null
+++ b/drivers/iio/pressure/Makefile
@@ -0,0 +1,10 @@
+#
+# Makefile for industrial I/O pressure drivers
+#
+
+obj-$(CONFIG_IIO_ST_PRESS) += st_pressure.o
+st_pressure-y := st_pressure_core.o
+st_pressure-$(CONFIG_IIO_BUFFER) += st_pressure_buffer.o
+
+obj-$(CONFIG_IIO_ST_PRESS_I2C) += st_pressure_i2c.o
+obj-$(CONFIG_IIO_ST_PRESS_SPI) += st_pressure_spi.o
diff --git a/drivers/iio/pressure/st_pressure.h b/drivers/iio/pressure/st_pressure.h
new file mode 100644
index 000000000000..414e45ac9b9b
--- /dev/null
+++ b/drivers/iio/pressure/st_pressure.h
@@ -0,0 +1,39 @@
+/*
+ * STMicroelectronics pressures driver
+ *
+ * Copyright 2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ * v. 1.0.0
+ * Licensed under the GPL-2.
+ */
+
+#ifndef ST_PRESS_H
+#define ST_PRESS_H
+
+#include <linux/types.h>
+#include <linux/iio/common/st_sensors.h>
+
+#define LPS331AP_PRESS_DEV_NAME         "lps331ap"
+
+int st_press_common_probe(struct iio_dev *indio_dev);
+void st_press_common_remove(struct iio_dev *indio_dev);
+
+#ifdef CONFIG_IIO_BUFFER
+int st_press_allocate_ring(struct iio_dev *indio_dev);
+void st_press_deallocate_ring(struct iio_dev *indio_dev);
+int st_press_trig_set_state(struct iio_trigger *trig, bool state);
+#define ST_PRESS_TRIGGER_SET_STATE (&st_press_trig_set_state)
+#else /* CONFIG_IIO_BUFFER */
+static inline int st_press_allocate_ring(struct iio_dev *indio_dev)
+{
+        return 0;
+}
+
+static inline void st_press_deallocate_ring(struct iio_dev *indio_dev)
+{
+}
+#define ST_PRESS_TRIGGER_SET_STATE NULL
+#endif /* CONFIG_IIO_BUFFER */
+
+#endif /* ST_PRESS_H */
diff --git a/drivers/iio/pressure/st_pressure_buffer.c b/drivers/iio/pressure/st_pressure_buffer.c
new file mode 100644
index 000000000000..f877ef8af520
--- /dev/null
+++ b/drivers/iio/pressure/st_pressure_buffer.c
@@ -0,0 +1,105 @@
+/*
+ * STMicroelectronics pressures driver
+ *
+ * Copyright 2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ *
+ * 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/i2c.h>
+#include <linux/delay.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/common/st_sensors.h>
+#include "st_pressure.h"
+
+int st_press_trig_set_state(struct iio_trigger *trig, bool state)
+{
+        struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
+
+        return st_sensors_set_dataready_irq(indio_dev, state);
+}
+
+static int st_press_buffer_preenable(struct iio_dev *indio_dev)
+{
+        int err;
+
+        err = st_sensors_set_enable(indio_dev, true);
+        if (err < 0)
+                goto st_press_set_enable_error;
+
+        err = iio_sw_buffer_preenable(indio_dev);
+
+st_press_set_enable_error:
+        return err;
+}
+
+static int st_press_buffer_postenable(struct iio_dev *indio_dev)
+{
+        int err;
+        struct st_sensor_data *pdata = iio_priv(indio_dev);
+
+        pdata->buffer_data = kmalloc(indio_dev->scan_bytes, GFP_KERNEL);
+        if (pdata->buffer_data == NULL) {
+                err = -ENOMEM;
+                goto allocate_memory_error;
+        }
+
+        err = iio_triggered_buffer_postenable(indio_dev);
+        if (err < 0)
+                goto st_press_buffer_postenable_error;
+
+        return err;
+
+st_press_buffer_postenable_error:
+        kfree(pdata->buffer_data);
+allocate_memory_error:
+        return err;
+}
+
+static int st_press_buffer_predisable(struct iio_dev *indio_dev)
+{
+        int err;
+        struct st_sensor_data *pdata = iio_priv(indio_dev);
+
+        err = iio_triggered_buffer_predisable(indio_dev);
+        if (err < 0)
+                goto st_press_buffer_predisable_error;
+
+        err = st_sensors_set_enable(indio_dev, false);
+
+st_press_buffer_predisable_error:
+        kfree(pdata->buffer_data);
+        return err;
+}
+
+static const struct iio_buffer_setup_ops st_press_buffer_setup_ops = {
+        .preenable = &st_press_buffer_preenable,
+        .postenable = &st_press_buffer_postenable,
+        .predisable = &st_press_buffer_predisable,
+};
+
+int st_press_allocate_ring(struct iio_dev *indio_dev)
+{
+        return iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
+                &st_sensors_trigger_handler, &st_press_buffer_setup_ops);
+}
+
+void st_press_deallocate_ring(struct iio_dev *indio_dev)
+{
+        iio_triggered_buffer_cleanup(indio_dev);
+}
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics pressures buffer");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/pressure/st_pressure_core.c b/drivers/iio/pressure/st_pressure_core.c
new file mode 100644
index 000000000000..9c343b40665e
--- /dev/null
+++ b/drivers/iio/pressure/st_pressure_core.c
@@ -0,0 +1,272 @@
+/*
+ * STMicroelectronics pressures driver
+ *
+ * Copyright 2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ *
+ * 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/delay.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/buffer.h>
+#include <asm/unaligned.h>
+
+#include <linux/iio/common/st_sensors.h>
+#include "st_pressure.h"
+
+#define ST_PRESS_MBAR_TO_KPASCAL(x)             (x * 10)
+#define ST_PRESS_NUMBER_DATA_CHANNELS           1
+
+/* DEFAULT VALUE FOR SENSORS */
+#define ST_PRESS_DEFAULT_OUT_XL_ADDR            0x28
+#define ST_TEMP_DEFAULT_OUT_L_ADDR              0x2b
+
+/* FULLSCALE */
+#define ST_PRESS_FS_AVL_1260MB                  1260
+
+/* CUSTOM VALUES FOR SENSOR 1 */
+#define ST_PRESS_1_WAI_EXP                      0xbb
+#define ST_PRESS_1_ODR_ADDR                     0x20
+#define ST_PRESS_1_ODR_MASK                     0x70
+#define ST_PRESS_1_ODR_AVL_1HZ_VAL              0x01
+#define ST_PRESS_1_ODR_AVL_7HZ_VAL              0x05
+#define ST_PRESS_1_ODR_AVL_13HZ_VAL             0x06
+#define ST_PRESS_1_ODR_AVL_25HZ_VAL             0x07
+#define ST_PRESS_1_PW_ADDR                      0x20
+#define ST_PRESS_1_PW_MASK                      0x80
+#define ST_PRESS_1_FS_ADDR                      0x23
+#define ST_PRESS_1_FS_MASK                      0x30
+#define ST_PRESS_1_FS_AVL_1260_VAL              0x00
+#define ST_PRESS_1_FS_AVL_1260_GAIN             ST_PRESS_MBAR_TO_KPASCAL(244141)
+#define ST_PRESS_1_FS_AVL_TEMP_GAIN             2083000
+#define ST_PRESS_1_BDU_ADDR                     0x20
+#define ST_PRESS_1_BDU_MASK                     0x04
+#define ST_PRESS_1_DRDY_IRQ_ADDR                0x22
+#define ST_PRESS_1_DRDY_IRQ_MASK                0x04
+#define ST_PRESS_1_MULTIREAD_BIT                true
+#define ST_PRESS_1_TEMP_OFFSET                  42500
+
+static const struct iio_chan_spec st_press_channels[] = {
+        ST_SENSORS_LSM_CHANNELS(IIO_PRESSURE,
+                        BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
+                        ST_SENSORS_SCAN_X, 0, IIO_NO_MOD, 'u', IIO_LE, 24, 24,
+                        ST_PRESS_DEFAULT_OUT_XL_ADDR),
+        ST_SENSORS_LSM_CHANNELS(IIO_TEMP,
+                        BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE) |
+                                                BIT(IIO_CHAN_INFO_OFFSET),
+                        -1, 0, IIO_NO_MOD, 's', IIO_LE, 16, 16,
+                        ST_TEMP_DEFAULT_OUT_L_ADDR),
+        IIO_CHAN_SOFT_TIMESTAMP(1)
+};
+
+static const struct st_sensors st_press_sensors[] = {
+        {
+                .wai = ST_PRESS_1_WAI_EXP,
+                .sensors_supported = {
+                        [0] = LPS331AP_PRESS_DEV_NAME,
+                },
+                .ch = (struct iio_chan_spec *)st_press_channels,
+                .odr = {
+                        .addr = ST_PRESS_1_ODR_ADDR,
+                        .mask = ST_PRESS_1_ODR_MASK,
+                        .odr_avl = {
+                                { 1, ST_PRESS_1_ODR_AVL_1HZ_VAL, },
+                                { 7, ST_PRESS_1_ODR_AVL_7HZ_VAL, },
+                                { 13, ST_PRESS_1_ODR_AVL_13HZ_VAL, },
+                                { 25, ST_PRESS_1_ODR_AVL_25HZ_VAL, },
+                        },
+                },
+                .pw = {
+                        .addr = ST_PRESS_1_PW_ADDR,
+                        .mask = ST_PRESS_1_PW_MASK,
+                        .value_on = ST_SENSORS_DEFAULT_POWER_ON_VALUE,
+                        .value_off = ST_SENSORS_DEFAULT_POWER_OFF_VALUE,
+                },
+                .fs = {
+                        .addr = ST_PRESS_1_FS_ADDR,
+                        .mask = ST_PRESS_1_FS_MASK,
+                        .fs_avl = {
+                                [0] = {
+                                        .num = ST_PRESS_FS_AVL_1260MB,
+                                        .value = ST_PRESS_1_FS_AVL_1260_VAL,
+                                        .gain = ST_PRESS_1_FS_AVL_1260_GAIN,
+                                        .gain2 = ST_PRESS_1_FS_AVL_TEMP_GAIN,
+                                },
+                        },
+                },
+                .bdu = {
+                        .addr = ST_PRESS_1_BDU_ADDR,
+                        .mask = ST_PRESS_1_BDU_MASK,
+                },
+                .drdy_irq = {
+                        .addr = ST_PRESS_1_DRDY_IRQ_ADDR,
+                        .mask = ST_PRESS_1_DRDY_IRQ_MASK,
+                },
+                .multi_read_bit = ST_PRESS_1_MULTIREAD_BIT,
+                .bootime = 2,
+        },
+};
+
+static int st_press_read_raw(struct iio_dev *indio_dev,
+                        struct iio_chan_spec const *ch, int *val,
+                                                        int *val2, long mask)
+{
+        int err;
+        struct st_sensor_data *pdata = iio_priv(indio_dev);
+
+        switch (mask) {
+        case IIO_CHAN_INFO_RAW:
+                err = st_sensors_read_info_raw(indio_dev, ch, val);
+                if (err < 0)
+                        goto read_error;
+
+                return IIO_VAL_INT;
+        case IIO_CHAN_INFO_SCALE:
+                *val = 0;
+
+                switch (ch->type) {
+                case IIO_PRESSURE:
+                        *val2 = pdata->current_fullscale->gain;
+                        break;
+                case IIO_TEMP:
+                        *val2 = pdata->current_fullscale->gain2;
+                        break;
+                default:
+                        err = -EINVAL;
+                        goto read_error;
+                }
+
+                return IIO_VAL_INT_PLUS_NANO;
+        case IIO_CHAN_INFO_OFFSET:
+                switch (ch->type) {
+                case IIO_TEMP:
+                        *val = 425;
+                        *val2 = 10;
+                        break;
+                default:
+                        err = -EINVAL;
+                        goto read_error;
+                }
+
+                return IIO_VAL_FRACTIONAL;
+        default:
+                return -EINVAL;
+        }
+
+read_error:
+        return err;
+}
+
+static ST_SENSOR_DEV_ATTR_SAMP_FREQ();
+static ST_SENSORS_DEV_ATTR_SAMP_FREQ_AVAIL();
+
+static struct attribute *st_press_attributes[] = {
+        &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
+        &iio_dev_attr_sampling_frequency.dev_attr.attr,
+        NULL,
+};
+
+static const struct attribute_group st_press_attribute_group = {
+        .attrs = st_press_attributes,
+};
+
+static const struct iio_info press_info = {
+        .driver_module = THIS_MODULE,
+        .attrs = &st_press_attribute_group,
+        .read_raw = &st_press_read_raw,
+};
+
+#ifdef CONFIG_IIO_TRIGGER
+static const struct iio_trigger_ops st_press_trigger_ops = {
+        .owner = THIS_MODULE,
+        .set_trigger_state = ST_PRESS_TRIGGER_SET_STATE,
+};
+#define ST_PRESS_TRIGGER_OPS (&st_press_trigger_ops)
+#else
+#define ST_PRESS_TRIGGER_OPS NULL
+#endif
+
+int st_press_common_probe(struct iio_dev *indio_dev)
+{
+        int err;
+        struct st_sensor_data *pdata = iio_priv(indio_dev);
+
+        indio_dev->modes = INDIO_DIRECT_MODE;
+        indio_dev->info = &press_info;
+
+        err = st_sensors_check_device_support(indio_dev,
+                                ARRAY_SIZE(st_press_sensors), st_press_sensors);
+        if (err < 0)
+                goto st_press_common_probe_error;
+
+        pdata->num_data_channels = ST_PRESS_NUMBER_DATA_CHANNELS;
+        pdata->multiread_bit = pdata->sensor->multi_read_bit;
+        indio_dev->channels = pdata->sensor->ch;
+        indio_dev->num_channels = ARRAY_SIZE(st_press_channels);
+
+        pdata->current_fullscale = (struct st_sensor_fullscale_avl *)
+                                                &pdata->sensor->fs.fs_avl[0];
+        pdata->odr = pdata->sensor->odr.odr_avl[0].hz;
+
+        err = st_sensors_init_sensor(indio_dev);
+        if (err < 0)
+                goto st_press_common_probe_error;
+
+        if (pdata->get_irq_data_ready(indio_dev) > 0) {
+                err = st_press_allocate_ring(indio_dev);
+                if (err < 0)
+                        goto st_press_common_probe_error;
+
+                err = st_sensors_allocate_trigger(indio_dev,
+                                                        ST_PRESS_TRIGGER_OPS);
+                if (err < 0)
+                        goto st_press_probe_trigger_error;
+        }
+
+        err = iio_device_register(indio_dev);
+        if (err)
+                goto st_press_device_register_error;
+
+        return err;
+
+st_press_device_register_error:
+        if (pdata->get_irq_data_ready(indio_dev) > 0)
+                st_sensors_deallocate_trigger(indio_dev);
+st_press_probe_trigger_error:
+        if (pdata->get_irq_data_ready(indio_dev) > 0)
+                st_press_deallocate_ring(indio_dev);
+st_press_common_probe_error:
+        return err;
+}
+EXPORT_SYMBOL(st_press_common_probe);
+
+void st_press_common_remove(struct iio_dev *indio_dev)
+{
+        struct st_sensor_data *pdata = iio_priv(indio_dev);
+
+        iio_device_unregister(indio_dev);
+        if (pdata->get_irq_data_ready(indio_dev) > 0) {
+                st_sensors_deallocate_trigger(indio_dev);
+                st_press_deallocate_ring(indio_dev);
+        }
+        iio_device_free(indio_dev);
+}
+EXPORT_SYMBOL(st_press_common_remove);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics pressures driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/pressure/st_pressure_i2c.c b/drivers/iio/pressure/st_pressure_i2c.c
new file mode 100644
index 000000000000..7cebcc73bfb0
--- /dev/null
+++ b/drivers/iio/pressure/st_pressure_i2c.c
@@ -0,0 +1,77 @@
+/*
+ * STMicroelectronics pressures driver
+ *
+ * Copyright 2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ *
+ * 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/common/st_sensors.h>
+#include <linux/iio/common/st_sensors_i2c.h>
+#include "st_pressure.h"
+
+static int st_press_i2c_probe(struct i2c_client *client,
+                                                const struct i2c_device_id *id)
+{
+        struct iio_dev *indio_dev;
+        struct st_sensor_data *pdata;
+        int err;
+
+        indio_dev = iio_device_alloc(sizeof(*pdata));
+        if (indio_dev == NULL) {
+                err = -ENOMEM;
+                goto iio_device_alloc_error;
+        }
+
+        pdata = iio_priv(indio_dev);
+        pdata->dev = &client->dev;
+
+        st_sensors_i2c_configure(indio_dev, client, pdata);
+
+        err = st_press_common_probe(indio_dev);
+        if (err < 0)
+                goto st_press_common_probe_error;
+
+        return 0;
+
+st_press_common_probe_error:
+        iio_device_free(indio_dev);
+iio_device_alloc_error:
+        return err;
+}
+
+static int st_press_i2c_remove(struct i2c_client *client)
+{
+        st_press_common_remove(i2c_get_clientdata(client));
+
+        return 0;
+}
+
+static const struct i2c_device_id st_press_id_table[] = {
+        { LPS331AP_PRESS_DEV_NAME },
+        {},
+};
+MODULE_DEVICE_TABLE(i2c, st_press_id_table);
+
+static struct i2c_driver st_press_driver = {
+        .driver = {
+                .owner = THIS_MODULE,
+                .name = "st-press-i2c",
+        },
+        .probe = st_press_i2c_probe,
+        .remove = st_press_i2c_remove,
+        .id_table = st_press_id_table,
+};
+module_i2c_driver(st_press_driver);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics pressures i2c driver");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/iio/pressure/st_pressure_spi.c b/drivers/iio/pressure/st_pressure_spi.c
new file mode 100644
index 000000000000..17a14907940a
--- /dev/null
+++ b/drivers/iio/pressure/st_pressure_spi.c
@@ -0,0 +1,76 @@
+/*
+ * STMicroelectronics pressures driver
+ *
+ * Copyright 2013 STMicroelectronics Inc.
+ *
+ * Denis Ciocca <denis.ciocca@st.com>
+ *
+ * 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/common/st_sensors.h>
+#include <linux/iio/common/st_sensors_spi.h>
+#include "st_pressure.h"
+
+static int st_press_spi_probe(struct spi_device *spi)
+{
+        struct iio_dev *indio_dev;
+        struct st_sensor_data *pdata;
+        int err;
+
+        indio_dev = iio_device_alloc(sizeof(*pdata));
+        if (indio_dev == NULL) {
+                err = -ENOMEM;
+                goto iio_device_alloc_error;
+        }
+
+        pdata = iio_priv(indio_dev);
+        pdata->dev = &spi->dev;
+
+        st_sensors_spi_configure(indio_dev, spi, pdata);
+
+        err = st_press_common_probe(indio_dev);
+        if (err < 0)
+                goto st_press_common_probe_error;
+
+        return 0;
+
+st_press_common_probe_error:
+        iio_device_free(indio_dev);
+iio_device_alloc_error:
+        return err;
+}
+
+static int st_press_spi_remove(struct spi_device *spi)
+{
+        st_press_common_remove(spi_get_drvdata(spi));
+
+        return 0;
+}
+
+static const struct spi_device_id st_press_id_table[] = {
+        { LPS331AP_PRESS_DEV_NAME },
+        {},
+};
+MODULE_DEVICE_TABLE(spi, st_press_id_table);
+
+static struct spi_driver st_press_driver = {
+        .driver = {
+                .owner = THIS_MODULE,
+                .name = "st-press-spi",
+        },
+        .probe = st_press_spi_probe,
+        .remove = st_press_spi_remove,
+        .id_table = st_press_id_table,
+};
+module_spi_driver(st_press_driver);
+
+MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
+MODULE_DESCRIPTION("STMicroelectronics pressures spi driver");
+MODULE_LICENSE("GPL v2");