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4b04266abe
kernel-ark/drivers/iio/accel/mma8452.c
Martin Kepplinger 4b04266abe iio: mma8452: add freefall detection for Freescale's accelerometers 
This adds freefall event detection to the supported devices. It adds
the in_accel_x&y&z_mag_falling_en iio event attribute, which activates
freefall mode.

In freefall mode, the current acceleration magnitude (AND combination
of all axis values) is compared to the specified threshold.
If it falls under the threshold (in_accel_mag_falling_value),
the appropriate IIO event code is generated.

This is what the sysfs "events" directory for these devices looks
like after this change:

-rw-r--r--    4096 Oct 23 08:45 in_accel_mag_falling_period
-rw-r--r--    4096 Oct 23 08:45 in_accel_mag_falling_value
-rw-r--r--    4096 Oct 23 08:45 in_accel_mag_rising_period
-rw-r--r--    4096 Oct 23 08:45 in_accel_mag_rising_value
-r--r--r--    4096 Oct 23 08:45 in_accel_scale
-rw-r--r--    4096 Oct 23 08:45 in_accel_x&y&z_mag_falling_en
-rw-r--r--    4096 Oct 23 08:45 in_accel_x_mag_rising_en
-rw-r--r--    4096 Oct 23 08:45 in_accel_y_mag_rising_en
-rw-r--r--    4096 Oct 23 08:45 in_accel_z_mag_rising_en

Signed-off-by: Martin Kepplinger <martin.kepplinger@theobroma-systems.com>
Signed-off-by: Christoph Muellner <christoph.muellner@theobroma-systems.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
2016-01-23 16:27:35 +00:00

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/*
* mma8452.c - Support for following Freescale 3-axis accelerometers:
*
* MMA8452Q (12 bit)
* MMA8453Q (10 bit)
* MMA8652FC (12 bit)
* MMA8653FC (10 bit)
*
* Copyright 2015 Martin Kepplinger <martin.kepplinger@theobroma-systems.com>
* Copyright 2014 Peter Meerwald <pmeerw@pmeerw.net>
*
* This file is subject to the terms and conditions of version 2 of
* the GNU General Public License. See the file COPYING in the main
* directory of this archive for more details.
*
* 7-bit I2C slave address 0x1c/0x1d (pin selectable)
*
* TODO: orientation events, autosleep
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/events.h>
#include <linux/delay.h>
#include <linux/of_device.h>
#include <linux/of_irq.h>
#define MMA8452_STATUS 0x00
#define MMA8452_STATUS_DRDY (BIT(2) | BIT(1) | BIT(0))
#define MMA8452_OUT_X 0x01 /* MSB first */
#define MMA8452_OUT_Y 0x03
#define MMA8452_OUT_Z 0x05
#define MMA8452_INT_SRC 0x0c
#define MMA8452_WHO_AM_I 0x0d
#define MMA8452_DATA_CFG 0x0e
#define MMA8452_DATA_CFG_FS_MASK GENMASK(1, 0)
#define MMA8452_DATA_CFG_FS_2G 0
#define MMA8452_DATA_CFG_FS_4G 1
#define MMA8452_DATA_CFG_FS_8G 2
#define MMA8452_DATA_CFG_HPF_MASK BIT(4)
#define MMA8452_HP_FILTER_CUTOFF 0x0f
#define MMA8452_HP_FILTER_CUTOFF_SEL_MASK GENMASK(1, 0)
#define MMA8452_FF_MT_CFG 0x15
#define MMA8452_FF_MT_CFG_OAE BIT(6)
#define MMA8452_FF_MT_CFG_ELE BIT(7)
#define MMA8452_FF_MT_SRC 0x16
#define MMA8452_FF_MT_SRC_XHE BIT(1)
#define MMA8452_FF_MT_SRC_YHE BIT(3)
#define MMA8452_FF_MT_SRC_ZHE BIT(5)
#define MMA8452_FF_MT_THS 0x17
#define MMA8452_FF_MT_THS_MASK 0x7f
#define MMA8452_FF_MT_COUNT 0x18
#define MMA8452_TRANSIENT_CFG 0x1d
#define MMA8452_TRANSIENT_CFG_HPF_BYP BIT(0)
#define MMA8452_TRANSIENT_CFG_ELE BIT(4)
#define MMA8452_TRANSIENT_SRC 0x1e
#define MMA8452_TRANSIENT_SRC_XTRANSE BIT(1)
#define MMA8452_TRANSIENT_SRC_YTRANSE BIT(3)
#define MMA8452_TRANSIENT_SRC_ZTRANSE BIT(5)
#define MMA8452_TRANSIENT_THS 0x1f
#define MMA8452_TRANSIENT_THS_MASK GENMASK(6, 0)
#define MMA8452_TRANSIENT_COUNT 0x20
#define MMA8452_CTRL_REG1 0x2a
#define MMA8452_CTRL_ACTIVE BIT(0)
#define MMA8452_CTRL_DR_MASK GENMASK(5, 3)
#define MMA8452_CTRL_DR_SHIFT 3
#define MMA8452_CTRL_DR_DEFAULT 0x4 /* 50 Hz sample frequency */
#define MMA8452_CTRL_REG2 0x2b
#define MMA8452_CTRL_REG2_RST BIT(6)
#define MMA8452_CTRL_REG4 0x2d
#define MMA8452_CTRL_REG5 0x2e
#define MMA8452_OFF_X 0x2f
#define MMA8452_OFF_Y 0x30
#define MMA8452_OFF_Z 0x31
#define MMA8452_MAX_REG 0x31
#define MMA8452_INT_DRDY BIT(0)
#define MMA8452_INT_FF_MT BIT(2)
#define MMA8452_INT_TRANS BIT(5)
#define MMA8452_DEVICE_ID 0x2a
#define MMA8453_DEVICE_ID 0x3a
#define MMA8652_DEVICE_ID 0x4a
#define MMA8653_DEVICE_ID 0x5a
struct mma8452_data {
struct i2c_client *client;
struct mutex lock;
u8 ctrl_reg1;
u8 data_cfg;
const struct mma_chip_info *chip_info;
};
/**
* struct mma_chip_info - chip specific data for Freescale's accelerometers
* @chip_id: WHO_AM_I register's value
* @channels: struct iio_chan_spec matching the device's
* capabilities
* @num_channels: number of channels
* @mma_scales: scale factors for converting register values
* to m/s^2; 3 modes: 2g, 4g, 8g; 2 integers
* per mode: m/s^2 and micro m/s^2
* @ev_cfg: event config register address
* @ev_cfg_ele: latch bit in event config register
* @ev_cfg_chan_shift: number of the bit to enable events in X
* direction; in event config register
* @ev_src: event source register address
* @ev_src_xe: bit in event source register that indicates
* an event in X direction
* @ev_src_ye: bit in event source register that indicates
* an event in Y direction
* @ev_src_ze: bit in event source register that indicates
* an event in Z direction
* @ev_ths: event threshold register address
* @ev_ths_mask: mask for the threshold value
* @ev_count: event count (period) register address
*
* Since not all chips supported by the driver support comparing high pass
* filtered data for events (interrupts), different interrupt sources are
* used for different chips and the relevant registers are included here.
*/
struct mma_chip_info {
u8 chip_id;
const struct iio_chan_spec *channels;
int num_channels;
const int mma_scales[3][2];
u8 ev_cfg;
u8 ev_cfg_ele;
u8 ev_cfg_chan_shift;
u8 ev_src;
u8 ev_src_xe;
u8 ev_src_ye;
u8 ev_src_ze;
u8 ev_ths;
u8 ev_ths_mask;
u8 ev_count;
};
enum {
idx_x,
idx_y,
idx_z,
idx_ts,
};
static int mma8452_drdy(struct mma8452_data *data)
{
int tries = 150;
while (tries-- > 0) {
int ret = i2c_smbus_read_byte_data(data->client,
MMA8452_STATUS);
if (ret < 0)
return ret;
if ((ret & MMA8452_STATUS_DRDY) == MMA8452_STATUS_DRDY)
return 0;
msleep(20);
}
dev_err(&data->client->dev, "data not ready\n");
return -EIO;
}
static int mma8452_read(struct mma8452_data *data, __be16 buf[3])
{
int ret = mma8452_drdy(data);
if (ret < 0)
return ret;
return i2c_smbus_read_i2c_block_data(data->client, MMA8452_OUT_X,
3 * sizeof(__be16), (u8 *)buf);
}
static ssize_t mma8452_show_int_plus_micros(char *buf, const int (*vals)[2],
int n)
{
size_t len = 0;
while (n-- > 0)
len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ",
vals[n][0], vals[n][1]);
/* replace trailing space by newline */
buf[len - 1] = '\n';
return len;
}
static int mma8452_get_int_plus_micros_index(const int (*vals)[2], int n,
int val, int val2)
{
while (n-- > 0)
if (val == vals[n][0] && val2 == vals[n][1])
return n;
return -EINVAL;
}
static int mma8452_get_odr_index(struct mma8452_data *data)
{
return (data->ctrl_reg1 & MMA8452_CTRL_DR_MASK) >>
MMA8452_CTRL_DR_SHIFT;
}
static const int mma8452_samp_freq[8][2] = {
{800, 0}, {400, 0}, {200, 0}, {100, 0}, {50, 0}, {12, 500000},
{6, 250000}, {1, 560000}
};
/* Datasheet table 35 (step time vs sample frequency) */
static const int mma8452_transient_time_step_us[8] = {
1250,
2500,
5000,
10000,
20000,
20000,
20000,
20000
};
/* Datasheet table 18 (normal mode) */
static const int mma8452_hp_filter_cutoff[8][4][2] = {
{ {16, 0}, {8, 0}, {4, 0}, {2, 0} }, /* 800 Hz sample */
{ {16, 0}, {8, 0}, {4, 0}, {2, 0} }, /* 400 Hz sample */
{ {8, 0}, {4, 0}, {2, 0}, {1, 0} }, /* 200 Hz sample */
{ {4, 0}, {2, 0}, {1, 0}, {0, 500000} }, /* 100 Hz sample */
{ {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, /* 50 Hz sample */
{ {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, /* 12.5 Hz sample */
{ {2, 0}, {1, 0}, {0, 500000}, {0, 250000} }, /* 6.25 Hz sample */
{ {2, 0}, {1, 0}, {0, 500000}, {0, 250000} } /* 1.56 Hz sample */
};
static ssize_t mma8452_show_samp_freq_avail(struct device *dev,
struct device_attribute *attr,
char *buf)
{
return mma8452_show_int_plus_micros(buf, mma8452_samp_freq,
ARRAY_SIZE(mma8452_samp_freq));
}
static ssize_t mma8452_show_scale_avail(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct mma8452_data *data = iio_priv(i2c_get_clientdata(
to_i2c_client(dev)));
return mma8452_show_int_plus_micros(buf, data->chip_info->mma_scales,
ARRAY_SIZE(data->chip_info->mma_scales));
}
static ssize_t mma8452_show_hp_cutoff_avail(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct mma8452_data *data = iio_priv(indio_dev);
int i = mma8452_get_odr_index(data);
return mma8452_show_int_plus_micros(buf, mma8452_hp_filter_cutoff[i],
ARRAY_SIZE(mma8452_hp_filter_cutoff[0]));
}
static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(mma8452_show_samp_freq_avail);
static IIO_DEVICE_ATTR(in_accel_scale_available, S_IRUGO,
mma8452_show_scale_avail, NULL, 0);
static IIO_DEVICE_ATTR(in_accel_filter_high_pass_3db_frequency_available,
S_IRUGO, mma8452_show_hp_cutoff_avail, NULL, 0);
static int mma8452_get_samp_freq_index(struct mma8452_data *data,
int val, int val2)
{
return mma8452_get_int_plus_micros_index(mma8452_samp_freq,
ARRAY_SIZE(mma8452_samp_freq),
val, val2);
}
static int mma8452_get_scale_index(struct mma8452_data *data, int val, int val2)
{
return mma8452_get_int_plus_micros_index(data->chip_info->mma_scales,
ARRAY_SIZE(data->chip_info->mma_scales), val, val2);
}
static int mma8452_get_hp_filter_index(struct mma8452_data *data,
int val, int val2)
{
int i = mma8452_get_odr_index(data);
return mma8452_get_int_plus_micros_index(mma8452_hp_filter_cutoff[i],
ARRAY_SIZE(mma8452_hp_filter_cutoff[0]), val, val2);
}
static int mma8452_read_hp_filter(struct mma8452_data *data, int *hz, int *uHz)
{
int i, ret;
ret = i2c_smbus_read_byte_data(data->client, MMA8452_HP_FILTER_CUTOFF);
if (ret < 0)
return ret;
i = mma8452_get_odr_index(data);
ret &= MMA8452_HP_FILTER_CUTOFF_SEL_MASK;
*hz = mma8452_hp_filter_cutoff[i][ret][0];
*uHz = mma8452_hp_filter_cutoff[i][ret][1];
return 0;
}
static int mma8452_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct mma8452_data *data = iio_priv(indio_dev);
__be16 buffer[3];
int i, ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
if (iio_buffer_enabled(indio_dev))
return -EBUSY;
mutex_lock(&data->lock);
ret = mma8452_read(data, buffer);
mutex_unlock(&data->lock);
if (ret < 0)
return ret;
*val = sign_extend32(be16_to_cpu(
buffer[chan->scan_index]) >> chan->scan_type.shift,
chan->scan_type.realbits - 1);
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
i = data->data_cfg & MMA8452_DATA_CFG_FS_MASK;
*val = data->chip_info->mma_scales[i][0];
*val2 = data->chip_info->mma_scales[i][1];
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_SAMP_FREQ:
i = mma8452_get_odr_index(data);
*val = mma8452_samp_freq[i][0];
*val2 = mma8452_samp_freq[i][1];
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_CALIBBIAS:
ret = i2c_smbus_read_byte_data(data->client,
MMA8452_OFF_X + chan->scan_index);
if (ret < 0)
return ret;
*val = sign_extend32(ret, 7);
return IIO_VAL_INT;
case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
if (data->data_cfg & MMA8452_DATA_CFG_HPF_MASK) {
ret = mma8452_read_hp_filter(data, val, val2);
if (ret < 0)
return ret;
} else {
*val = 0;
*val2 = 0;
}
return IIO_VAL_INT_PLUS_MICRO;
}
return -EINVAL;
}
static int mma8452_standby(struct mma8452_data *data)
{
return i2c_smbus_write_byte_data(data->client, MMA8452_CTRL_REG1,
data->ctrl_reg1 & ~MMA8452_CTRL_ACTIVE);
}
static int mma8452_active(struct mma8452_data *data)
{
return i2c_smbus_write_byte_data(data->client, MMA8452_CTRL_REG1,
data->ctrl_reg1);
}
static int mma8452_change_config(struct mma8452_data *data, u8 reg, u8 val)
{
int ret;
mutex_lock(&data->lock);
/* config can only be changed when in standby */
ret = mma8452_standby(data);
if (ret < 0)
goto fail;
ret = i2c_smbus_write_byte_data(data->client, reg, val);
if (ret < 0)
goto fail;
ret = mma8452_active(data);
if (ret < 0)
goto fail;
ret = 0;
fail:
mutex_unlock(&data->lock);
return ret;
}
/* returns >0 if in freefall mode, 0 if not or <0 if an error occured */
static int mma8452_freefall_mode_enabled(struct mma8452_data *data)
{
int val;
const struct mma_chip_info *chip = data->chip_info;
val = i2c_smbus_read_byte_data(data->client, chip->ev_cfg);
if (val < 0)
return val;
return !(val & MMA8452_FF_MT_CFG_OAE);
}
static int mma8452_set_freefall_mode(struct mma8452_data *data, bool state)
{
int val;
const struct mma_chip_info *chip = data->chip_info;
if ((state && mma8452_freefall_mode_enabled(data)) ||
(!state && !(mma8452_freefall_mode_enabled(data))))
return 0;
val = i2c_smbus_read_byte_data(data->client, chip->ev_cfg);
if (val < 0)
return val;
if (state) {
val |= BIT(idx_x + chip->ev_cfg_chan_shift);
val |= BIT(idx_y + chip->ev_cfg_chan_shift);
val |= BIT(idx_z + chip->ev_cfg_chan_shift);
val &= ~MMA8452_FF_MT_CFG_OAE;
} else {
val &= ~BIT(idx_x + chip->ev_cfg_chan_shift);
val &= ~BIT(idx_y + chip->ev_cfg_chan_shift);
val &= ~BIT(idx_z + chip->ev_cfg_chan_shift);
val |= MMA8452_FF_MT_CFG_OAE;
}
val = mma8452_change_config(data, chip->ev_cfg, val);
if (val)
return val;
return 0;
}
static int mma8452_set_hp_filter_frequency(struct mma8452_data *data,
int val, int val2)
{
int i, reg;
i = mma8452_get_hp_filter_index(data, val, val2);
if (i < 0)
return i;
reg = i2c_smbus_read_byte_data(data->client,
MMA8452_HP_FILTER_CUTOFF);
if (reg < 0)
return reg;
reg &= ~MMA8452_HP_FILTER_CUTOFF_SEL_MASK;
reg |= i;
return mma8452_change_config(data, MMA8452_HP_FILTER_CUTOFF, reg);
}
static int mma8452_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val, int val2, long mask)
{
struct mma8452_data *data = iio_priv(indio_dev);
int i, ret;
if (iio_buffer_enabled(indio_dev))
return -EBUSY;
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
i = mma8452_get_samp_freq_index(data, val, val2);
if (i < 0)
return i;
data->ctrl_reg1 &= ~MMA8452_CTRL_DR_MASK;
data->ctrl_reg1 |= i << MMA8452_CTRL_DR_SHIFT;
return mma8452_change_config(data, MMA8452_CTRL_REG1,
data->ctrl_reg1);
case IIO_CHAN_INFO_SCALE:
i = mma8452_get_scale_index(data, val, val2);
if (i < 0)
return i;
data->data_cfg &= ~MMA8452_DATA_CFG_FS_MASK;
data->data_cfg |= i;
return mma8452_change_config(data, MMA8452_DATA_CFG,
data->data_cfg);
case IIO_CHAN_INFO_CALIBBIAS:
if (val < -128 || val > 127)
return -EINVAL;
return mma8452_change_config(data,
MMA8452_OFF_X + chan->scan_index,
val);
case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
if (val == 0 && val2 == 0) {
data->data_cfg &= ~MMA8452_DATA_CFG_HPF_MASK;
} else {
data->data_cfg |= MMA8452_DATA_CFG_HPF_MASK;
ret = mma8452_set_hp_filter_frequency(data, val, val2);
if (ret < 0)
return ret;
}
return mma8452_change_config(data, MMA8452_DATA_CFG,
data->data_cfg);
default:
return -EINVAL;
}
}
static int mma8452_read_thresh(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
enum iio_event_info info,
int *val, int *val2)
{
struct mma8452_data *data = iio_priv(indio_dev);
int ret, us;
switch (info) {
case IIO_EV_INFO_VALUE:
ret = i2c_smbus_read_byte_data(data->client,
data->chip_info->ev_ths);
if (ret < 0)
return ret;
*val = ret & data->chip_info->ev_ths_mask;
return IIO_VAL_INT;
case IIO_EV_INFO_PERIOD:
ret = i2c_smbus_read_byte_data(data->client,
data->chip_info->ev_count);
if (ret < 0)
return ret;
us = ret * mma8452_transient_time_step_us[
mma8452_get_odr_index(data)];
*val = us / USEC_PER_SEC;
*val2 = us % USEC_PER_SEC;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_EV_INFO_HIGH_PASS_FILTER_3DB:
ret = i2c_smbus_read_byte_data(data->client,
MMA8452_TRANSIENT_CFG);
if (ret < 0)
return ret;
if (ret & MMA8452_TRANSIENT_CFG_HPF_BYP) {
*val = 0;
*val2 = 0;
} else {
ret = mma8452_read_hp_filter(data, val, val2);
if (ret < 0)
return ret;
}
return IIO_VAL_INT_PLUS_MICRO;
default:
return -EINVAL;
}
}
static int mma8452_write_thresh(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
enum iio_event_info info,
int val, int val2)
{
struct mma8452_data *data = iio_priv(indio_dev);
int ret, reg, steps;
switch (info) {
case IIO_EV_INFO_VALUE:
if (val < 0 || val > MMA8452_TRANSIENT_THS_MASK)
return -EINVAL;
return mma8452_change_config(data, data->chip_info->ev_ths,
val);
case IIO_EV_INFO_PERIOD:
steps = (val * USEC_PER_SEC + val2) /
mma8452_transient_time_step_us[
mma8452_get_odr_index(data)];
if (steps < 0 || steps > 0xff)
return -EINVAL;
return mma8452_change_config(data, data->chip_info->ev_count,
steps);
case IIO_EV_INFO_HIGH_PASS_FILTER_3DB:
reg = i2c_smbus_read_byte_data(data->client,
MMA8452_TRANSIENT_CFG);
if (reg < 0)
return reg;
if (val == 0 && val2 == 0) {
reg |= MMA8452_TRANSIENT_CFG_HPF_BYP;
} else {
reg &= ~MMA8452_TRANSIENT_CFG_HPF_BYP;
ret = mma8452_set_hp_filter_frequency(data, val, val2);
if (ret < 0)
return ret;
}
return mma8452_change_config(data, MMA8452_TRANSIENT_CFG, reg);
default:
return -EINVAL;
}
}
static int mma8452_read_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir)
{
struct mma8452_data *data = iio_priv(indio_dev);
const struct mma_chip_info *chip = data->chip_info;
int ret;
switch (dir) {
case IIO_EV_DIR_FALLING:
return mma8452_freefall_mode_enabled(data);
case IIO_EV_DIR_RISING:
if (mma8452_freefall_mode_enabled(data))
return 0;
ret = i2c_smbus_read_byte_data(data->client,
data->chip_info->ev_cfg);
if (ret < 0)
return ret;
return !!(ret & BIT(chan->scan_index + chip->ev_cfg_chan_shift));
default:
return -EINVAL;
}
}
static int mma8452_write_event_config(struct iio_dev *indio_dev,
const struct iio_chan_spec *chan,
enum iio_event_type type,
enum iio_event_direction dir,
int state)
{
struct mma8452_data *data = iio_priv(indio_dev);
const struct mma_chip_info *chip = data->chip_info;
int val;
switch (dir) {
case IIO_EV_DIR_FALLING:
return mma8452_set_freefall_mode(data, state);
case IIO_EV_DIR_RISING:
val = i2c_smbus_read_byte_data(data->client, chip->ev_cfg);
if (val < 0)
return val;
if (state) {
if (mma8452_freefall_mode_enabled(data)) {
val &= ~BIT(idx_x + chip->ev_cfg_chan_shift);
val &= ~BIT(idx_y + chip->ev_cfg_chan_shift);
val &= ~BIT(idx_z + chip->ev_cfg_chan_shift);
val |= MMA8452_FF_MT_CFG_OAE;
}
val |= BIT(chan->scan_index + chip->ev_cfg_chan_shift);
} else {
if (mma8452_freefall_mode_enabled(data))
return 0;
val &= ~BIT(chan->scan_index + chip->ev_cfg_chan_shift);
}
val |= chip->ev_cfg_ele;
return mma8452_change_config(data, chip->ev_cfg, val);
default:
return -EINVAL;
}
}
static void mma8452_transient_interrupt(struct iio_dev *indio_dev)
{
struct mma8452_data *data = iio_priv(indio_dev);
s64 ts = iio_get_time_ns();
int src;
src = i2c_smbus_read_byte_data(data->client, data->chip_info->ev_src);
if (src < 0)
return;
if (mma8452_freefall_mode_enabled(data)) {
iio_push_event(indio_dev,
IIO_MOD_EVENT_CODE(IIO_ACCEL, 0,
IIO_MOD_X_AND_Y_AND_Z,
IIO_EV_TYPE_MAG,
IIO_EV_DIR_FALLING),
ts);
return;
}
if (src & data->chip_info->ev_src_xe)
iio_push_event(indio_dev,
IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_X,
IIO_EV_TYPE_MAG,
IIO_EV_DIR_RISING),
ts);
if (src & data->chip_info->ev_src_ye)
iio_push_event(indio_dev,
IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_Y,
IIO_EV_TYPE_MAG,
IIO_EV_DIR_RISING),
ts);
if (src & data->chip_info->ev_src_ze)
iio_push_event(indio_dev,
IIO_MOD_EVENT_CODE(IIO_ACCEL, 0, IIO_MOD_Z,
IIO_EV_TYPE_MAG,
IIO_EV_DIR_RISING),
ts);
}
static irqreturn_t mma8452_interrupt(int irq, void *p)
{
struct iio_dev *indio_dev = p;
struct mma8452_data *data = iio_priv(indio_dev);
const struct mma_chip_info *chip = data->chip_info;
int ret = IRQ_NONE;
int src;
src = i2c_smbus_read_byte_data(data->client, MMA8452_INT_SRC);
if (src < 0)
return IRQ_NONE;
if (src & MMA8452_INT_DRDY) {
iio_trigger_poll_chained(indio_dev->trig);
ret = IRQ_HANDLED;
}
if ((src & MMA8452_INT_TRANS &&
chip->ev_src == MMA8452_TRANSIENT_SRC) ||
(src & MMA8452_INT_FF_MT &&
chip->ev_src == MMA8452_FF_MT_SRC)) {
mma8452_transient_interrupt(indio_dev);
ret = IRQ_HANDLED;
}
return ret;
}
static irqreturn_t mma8452_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct mma8452_data *data = iio_priv(indio_dev);
u8 buffer[16]; /* 3 16-bit channels + padding + ts */
int ret;
ret = mma8452_read(data, (__be16 *)buffer);
if (ret < 0)
goto done;
iio_push_to_buffers_with_timestamp(indio_dev, buffer,
iio_get_time_ns());
done:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static int mma8452_reg_access_dbg(struct iio_dev *indio_dev,
unsigned reg, unsigned writeval,
unsigned *readval)
{
int ret;
struct mma8452_data *data = iio_priv(indio_dev);
if (reg > MMA8452_MAX_REG)
return -EINVAL;
if (!readval)
return mma8452_change_config(data, reg, writeval);
ret = i2c_smbus_read_byte_data(data->client, reg);
if (ret < 0)
return ret;
*readval = ret;
return 0;
}
static const struct iio_event_spec mma8452_freefall_event[] = {
{
.type = IIO_EV_TYPE_MAG,
.dir = IIO_EV_DIR_FALLING,
.mask_separate = BIT(IIO_EV_INFO_ENABLE),
.mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
BIT(IIO_EV_INFO_PERIOD) |
BIT(IIO_EV_INFO_HIGH_PASS_FILTER_3DB)
},
};
static const struct iio_event_spec mma8652_freefall_event[] = {
{
.type = IIO_EV_TYPE_MAG,
.dir = IIO_EV_DIR_FALLING,
.mask_separate = BIT(IIO_EV_INFO_ENABLE),
.mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
BIT(IIO_EV_INFO_PERIOD)
},
};
static const struct iio_event_spec mma8452_transient_event[] = {
{
.type = IIO_EV_TYPE_MAG,
.dir = IIO_EV_DIR_RISING,
.mask_separate = BIT(IIO_EV_INFO_ENABLE),
.mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
BIT(IIO_EV_INFO_PERIOD) |
BIT(IIO_EV_INFO_HIGH_PASS_FILTER_3DB)
},
};
static const struct iio_event_spec mma8452_motion_event[] = {
{
.type = IIO_EV_TYPE_MAG,
.dir = IIO_EV_DIR_RISING,
.mask_separate = BIT(IIO_EV_INFO_ENABLE),
.mask_shared_by_type = BIT(IIO_EV_INFO_VALUE) |
BIT(IIO_EV_INFO_PERIOD)
},
};
/*
* Threshold is configured in fixed 8G/127 steps regardless of
* currently selected scale for measurement.
*/
static IIO_CONST_ATTR_NAMED(accel_transient_scale, in_accel_scale, "0.617742");
static struct attribute *mma8452_event_attributes[] = {
&iio_const_attr_accel_transient_scale.dev_attr.attr,
NULL,
};
static struct attribute_group mma8452_event_attribute_group = {
.attrs = mma8452_event_attributes,
};
#define MMA8452_FREEFALL_CHANNEL(modifier) { \
.type = IIO_ACCEL, \
.modified = 1, \
.channel2 = modifier, \
.scan_index = -1, \
.event_spec = mma8452_freefall_event, \
.num_event_specs = ARRAY_SIZE(mma8452_freefall_event), \
}
#define MMA8652_FREEFALL_CHANNEL(modifier) { \
.type = IIO_ACCEL, \
.modified = 1, \
.channel2 = modifier, \
.scan_index = -1, \
.event_spec = mma8652_freefall_event, \
.num_event_specs = ARRAY_SIZE(mma8652_freefall_event), \
}
#define MMA8452_CHANNEL(axis, idx, bits) { \
.type = IIO_ACCEL, \
.modified = 1, \
.channel2 = IIO_MOD_##axis, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_CALIBBIAS), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
BIT(IIO_CHAN_INFO_SCALE) | \
BIT(IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY), \
.scan_index = idx, \
.scan_type = { \
.sign = 's', \
.realbits = (bits), \
.storagebits = 16, \
.shift = 16 - (bits), \
.endianness = IIO_BE, \
}, \
.event_spec = mma8452_transient_event, \
.num_event_specs = ARRAY_SIZE(mma8452_transient_event), \
}
#define MMA8652_CHANNEL(axis, idx, bits) { \
.type = IIO_ACCEL, \
.modified = 1, \
.channel2 = IIO_MOD_##axis, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_CALIBBIAS), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SAMP_FREQ) | \
BIT(IIO_CHAN_INFO_SCALE), \
.scan_index = idx, \
.scan_type = { \
.sign = 's', \
.realbits = (bits), \
.storagebits = 16, \
.shift = 16 - (bits), \
.endianness = IIO_BE, \
}, \
.event_spec = mma8452_motion_event, \
.num_event_specs = ARRAY_SIZE(mma8452_motion_event), \
}
static const struct iio_chan_spec mma8452_channels[] = {
MMA8452_CHANNEL(X, idx_x, 12),
MMA8452_CHANNEL(Y, idx_y, 12),
MMA8452_CHANNEL(Z, idx_z, 12),
IIO_CHAN_SOFT_TIMESTAMP(idx_ts),
MMA8452_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z),
};
static const struct iio_chan_spec mma8453_channels[] = {
MMA8452_CHANNEL(X, idx_x, 10),
MMA8452_CHANNEL(Y, idx_y, 10),
MMA8452_CHANNEL(Z, idx_z, 10),
IIO_CHAN_SOFT_TIMESTAMP(idx_ts),
MMA8452_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z),
};
static const struct iio_chan_spec mma8652_channels[] = {
MMA8652_CHANNEL(X, idx_x, 12),
MMA8652_CHANNEL(Y, idx_y, 12),
MMA8652_CHANNEL(Z, idx_z, 12),
IIO_CHAN_SOFT_TIMESTAMP(idx_ts),
MMA8652_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z),
};
static const struct iio_chan_spec mma8653_channels[] = {
MMA8652_CHANNEL(X, idx_x, 10),
MMA8652_CHANNEL(Y, idx_y, 10),
MMA8652_CHANNEL(Z, idx_z, 10),
IIO_CHAN_SOFT_TIMESTAMP(idx_ts),
MMA8652_FREEFALL_CHANNEL(IIO_MOD_X_AND_Y_AND_Z),
};
enum {
mma8452,
mma8453,
mma8652,
mma8653,
};
static const struct mma_chip_info mma_chip_info_table[] = {
[mma8452] = {
.chip_id = MMA8452_DEVICE_ID,
.channels = mma8452_channels,
.num_channels = ARRAY_SIZE(mma8452_channels),
/*
* Hardware has fullscale of -2G, -4G, -8G corresponding to
* raw value -2048 for 12 bit or -512 for 10 bit.
* The userspace interface uses m/s^2 and we declare micro units
* So scale factor for 12 bit here is given by:
* g * N * 1000000 / 2048 for N = 2, 4, 8 and g=9.80665
*/
.mma_scales = { {0, 9577}, {0, 19154}, {0, 38307} },
.ev_cfg = MMA8452_TRANSIENT_CFG,
.ev_cfg_ele = MMA8452_TRANSIENT_CFG_ELE,
.ev_cfg_chan_shift = 1,
.ev_src = MMA8452_TRANSIENT_SRC,
.ev_src_xe = MMA8452_TRANSIENT_SRC_XTRANSE,
.ev_src_ye = MMA8452_TRANSIENT_SRC_YTRANSE,
.ev_src_ze = MMA8452_TRANSIENT_SRC_ZTRANSE,
.ev_ths = MMA8452_TRANSIENT_THS,
.ev_ths_mask = MMA8452_TRANSIENT_THS_MASK,
.ev_count = MMA8452_TRANSIENT_COUNT,
},
[mma8453] = {
.chip_id = MMA8453_DEVICE_ID,
.channels = mma8453_channels,
.num_channels = ARRAY_SIZE(mma8453_channels),
.mma_scales = { {0, 38307}, {0, 76614}, {0, 153228} },
.ev_cfg = MMA8452_TRANSIENT_CFG,
.ev_cfg_ele = MMA8452_TRANSIENT_CFG_ELE,
.ev_cfg_chan_shift = 1,
.ev_src = MMA8452_TRANSIENT_SRC,
.ev_src_xe = MMA8452_TRANSIENT_SRC_XTRANSE,
.ev_src_ye = MMA8452_TRANSIENT_SRC_YTRANSE,
.ev_src_ze = MMA8452_TRANSIENT_SRC_ZTRANSE,
.ev_ths = MMA8452_TRANSIENT_THS,
.ev_ths_mask = MMA8452_TRANSIENT_THS_MASK,
.ev_count = MMA8452_TRANSIENT_COUNT,
},
[mma8652] = {
.chip_id = MMA8652_DEVICE_ID,
.channels = mma8652_channels,
.num_channels = ARRAY_SIZE(mma8652_channels),
.mma_scales = { {0, 9577}, {0, 19154}, {0, 38307} },
.ev_cfg = MMA8452_FF_MT_CFG,
.ev_cfg_ele = MMA8452_FF_MT_CFG_ELE,
.ev_cfg_chan_shift = 3,
.ev_src = MMA8452_FF_MT_SRC,
.ev_src_xe = MMA8452_FF_MT_SRC_XHE,
.ev_src_ye = MMA8452_FF_MT_SRC_YHE,
.ev_src_ze = MMA8452_FF_MT_SRC_ZHE,
.ev_ths = MMA8452_FF_MT_THS,
.ev_ths_mask = MMA8452_FF_MT_THS_MASK,
.ev_count = MMA8452_FF_MT_COUNT,
},
[mma8653] = {
.chip_id = MMA8653_DEVICE_ID,
.channels = mma8653_channels,
.num_channels = ARRAY_SIZE(mma8653_channels),
.mma_scales = { {0, 38307}, {0, 76614}, {0, 153228} },
.ev_cfg = MMA8452_FF_MT_CFG,
.ev_cfg_ele = MMA8452_FF_MT_CFG_ELE,
.ev_cfg_chan_shift = 3,
.ev_src = MMA8452_FF_MT_SRC,
.ev_src_xe = MMA8452_FF_MT_SRC_XHE,
.ev_src_ye = MMA8452_FF_MT_SRC_YHE,
.ev_src_ze = MMA8452_FF_MT_SRC_ZHE,
.ev_ths = MMA8452_FF_MT_THS,
.ev_ths_mask = MMA8452_FF_MT_THS_MASK,
.ev_count = MMA8452_FF_MT_COUNT,
},
};
static struct attribute *mma8452_attributes[] = {
&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
&iio_dev_attr_in_accel_scale_available.dev_attr.attr,
&iio_dev_attr_in_accel_filter_high_pass_3db_frequency_available.dev_attr.attr,
NULL
};
static const struct attribute_group mma8452_group = {
.attrs = mma8452_attributes,
};
static const struct iio_info mma8452_info = {
.attrs = &mma8452_group,
.read_raw = &mma8452_read_raw,
.write_raw = &mma8452_write_raw,
.event_attrs = &mma8452_event_attribute_group,
.read_event_value = &mma8452_read_thresh,
.write_event_value = &mma8452_write_thresh,
.read_event_config = &mma8452_read_event_config,
.write_event_config = &mma8452_write_event_config,
.debugfs_reg_access = &mma8452_reg_access_dbg,
.driver_module = THIS_MODULE,
};
static const unsigned long mma8452_scan_masks[] = {0x7, 0};
static int mma8452_data_rdy_trigger_set_state(struct iio_trigger *trig,
bool state)
{
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
struct mma8452_data *data = iio_priv(indio_dev);
int reg;
reg = i2c_smbus_read_byte_data(data->client, MMA8452_CTRL_REG4);
if (reg < 0)
return reg;
if (state)
reg |= MMA8452_INT_DRDY;
else
reg &= ~MMA8452_INT_DRDY;
return mma8452_change_config(data, MMA8452_CTRL_REG4, reg);
}
static int mma8452_validate_device(struct iio_trigger *trig,
struct iio_dev *indio_dev)
{
struct iio_dev *indio = iio_trigger_get_drvdata(trig);
if (indio != indio_dev)
return -EINVAL;
return 0;
}
static const struct iio_trigger_ops mma8452_trigger_ops = {
.set_trigger_state = mma8452_data_rdy_trigger_set_state,
.validate_device = mma8452_validate_device,
.owner = THIS_MODULE,
};
static int mma8452_trigger_setup(struct iio_dev *indio_dev)
{
struct mma8452_data *data = iio_priv(indio_dev);
struct iio_trigger *trig;
int ret;
trig = devm_iio_trigger_alloc(&data->client->dev, "%s-dev%d",
indio_dev->name,
indio_dev->id);
if (!trig)
return -ENOMEM;
trig->dev.parent = &data->client->dev;
trig->ops = &mma8452_trigger_ops;
iio_trigger_set_drvdata(trig, indio_dev);
ret = iio_trigger_register(trig);
if (ret)
return ret;
indio_dev->trig = trig;
return 0;
}
static void mma8452_trigger_cleanup(struct iio_dev *indio_dev)
{
if (indio_dev->trig)
iio_trigger_unregister(indio_dev->trig);
}
static int mma8452_reset(struct i2c_client *client)
{
int i;
int ret;
ret = i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG2,
MMA8452_CTRL_REG2_RST);
if (ret < 0)
return ret;
for (i = 0; i < 10; i++) {
usleep_range(100, 200);
ret = i2c_smbus_read_byte_data(client, MMA8452_CTRL_REG2);
if (ret == -EIO)
continue; /* I2C comm reset */
if (ret < 0)
return ret;
if (!(ret & MMA8452_CTRL_REG2_RST))
return 0;
}
return -ETIMEDOUT;
}
static const struct of_device_id mma8452_dt_ids[] = {
{ .compatible = "fsl,mma8452", .data = &mma_chip_info_table[mma8452] },
{ .compatible = "fsl,mma8453", .data = &mma_chip_info_table[mma8453] },
{ .compatible = "fsl,mma8652", .data = &mma_chip_info_table[mma8652] },
{ .compatible = "fsl,mma8653", .data = &mma_chip_info_table[mma8653] },
{ }
};
MODULE_DEVICE_TABLE(of, mma8452_dt_ids);
static int mma8452_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct mma8452_data *data;
struct iio_dev *indio_dev;
int ret;
const struct of_device_id *match;
match = of_match_device(mma8452_dt_ids, &client->dev);
if (!match) {
dev_err(&client->dev, "unknown device model\n");
return -ENODEV;
}
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
data = iio_priv(indio_dev);
data->client = client;
mutex_init(&data->lock);
data->chip_info = match->data;
ret = i2c_smbus_read_byte_data(client, MMA8452_WHO_AM_I);
if (ret < 0)
return ret;
switch (ret) {
case MMA8452_DEVICE_ID:
case MMA8453_DEVICE_ID:
case MMA8652_DEVICE_ID:
case MMA8653_DEVICE_ID:
if (ret == data->chip_info->chip_id)
break;
default:
return -ENODEV;
}
dev_info(&client->dev, "registering %s accelerometer; ID 0x%x\n",
match->compatible, data->chip_info->chip_id);
i2c_set_clientdata(client, indio_dev);
indio_dev->info = &mma8452_info;
indio_dev->name = id->name;
indio_dev->dev.parent = &client->dev;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels = data->chip_info->channels;
indio_dev->num_channels = data->chip_info->num_channels;
indio_dev->available_scan_masks = mma8452_scan_masks;
ret = mma8452_reset(client);
if (ret < 0)
return ret;
data->data_cfg = MMA8452_DATA_CFG_FS_2G;
ret = i2c_smbus_write_byte_data(client, MMA8452_DATA_CFG,
data->data_cfg);
if (ret < 0)
return ret;
/*
* By default set transient threshold to max to avoid events if
* enabling without configuring threshold.
*/
ret = i2c_smbus_write_byte_data(client, MMA8452_TRANSIENT_THS,
MMA8452_TRANSIENT_THS_MASK);
if (ret < 0)
return ret;
if (client->irq) {
/*
* Although we enable the interrupt sources once and for
* all here the event detection itself is not enabled until
* userspace asks for it by mma8452_write_event_config()
*/
int supported_interrupts = MMA8452_INT_DRDY |
MMA8452_INT_TRANS |
MMA8452_INT_FF_MT;
int enabled_interrupts = MMA8452_INT_TRANS |
MMA8452_INT_FF_MT;
int irq2;
irq2 = of_irq_get_byname(client->dev.of_node, "INT2");
if (irq2 == client->irq) {
dev_dbg(&client->dev, "using interrupt line INT2\n");
} else {
ret = i2c_smbus_write_byte_data(client,
MMA8452_CTRL_REG5,
supported_interrupts);
if (ret < 0)
return ret;
dev_dbg(&client->dev, "using interrupt line INT1\n");
}
ret = i2c_smbus_write_byte_data(client,
MMA8452_CTRL_REG4,
enabled_interrupts);
if (ret < 0)
return ret;
ret = mma8452_trigger_setup(indio_dev);
if (ret < 0)
return ret;
}
data->ctrl_reg1 = MMA8452_CTRL_ACTIVE |
(MMA8452_CTRL_DR_DEFAULT << MMA8452_CTRL_DR_SHIFT);
ret = i2c_smbus_write_byte_data(client, MMA8452_CTRL_REG1,
data->ctrl_reg1);
if (ret < 0)
goto trigger_cleanup;
ret = iio_triggered_buffer_setup(indio_dev, NULL,
mma8452_trigger_handler, NULL);
if (ret < 0)
goto trigger_cleanup;
if (client->irq) {
ret = devm_request_threaded_irq(&client->dev,
client->irq,
NULL, mma8452_interrupt,
IRQF_TRIGGER_LOW | IRQF_ONESHOT,
client->name, indio_dev);
if (ret)
goto buffer_cleanup;
}
ret = iio_device_register(indio_dev);
if (ret < 0)
goto buffer_cleanup;
ret = mma8452_set_freefall_mode(data, false);
if (ret)
return ret;
return 0;
buffer_cleanup:
iio_triggered_buffer_cleanup(indio_dev);
trigger_cleanup:
mma8452_trigger_cleanup(indio_dev);
return ret;
}
static int mma8452_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
iio_device_unregister(indio_dev);
iio_triggered_buffer_cleanup(indio_dev);
mma8452_trigger_cleanup(indio_dev);
mma8452_standby(iio_priv(indio_dev));
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int mma8452_suspend(struct device *dev)
{
return mma8452_standby(iio_priv(i2c_get_clientdata(
to_i2c_client(dev))));
}
static int mma8452_resume(struct device *dev)
{
return mma8452_active(iio_priv(i2c_get_clientdata(
to_i2c_client(dev))));
}
static SIMPLE_DEV_PM_OPS(mma8452_pm_ops, mma8452_suspend, mma8452_resume);
#define MMA8452_PM_OPS (&mma8452_pm_ops)
#else
#define MMA8452_PM_OPS NULL
#endif
static const struct i2c_device_id mma8452_id[] = {
{ "mma8452", mma8452 },
{ "mma8453", mma8453 },
{ "mma8652", mma8652 },
{ "mma8653", mma8653 },
{ }
};
MODULE_DEVICE_TABLE(i2c, mma8452_id);
static struct i2c_driver mma8452_driver = {
.driver = {
.name = "mma8452",
.of_match_table = of_match_ptr(mma8452_dt_ids),
.pm = MMA8452_PM_OPS,
},
.probe = mma8452_probe,
.remove = mma8452_remove,
.id_table = mma8452_id,
};
module_i2c_driver(mma8452_driver);
MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
MODULE_DESCRIPTION("Freescale MMA8452 accelerometer driver");
MODULE_LICENSE("GPL");
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