/*
- * mma8452.c - Support for Freescale MMA8452Q 3-axis 12-bit accelerometer
+ * 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
*
* 7-bit I2C slave address 0x1c/0x1d (pin selectable)
*
- * TODO: interrupt, thresholding, orientation / freefall events, autosleep
+ * TODO: orientation / freefall events, autosleep
*/
#include <linux/module.h>
#include <linux/i2c.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/trigger.h>
+#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/events.h>
#include <linux/delay.h>
-
-#define MMA8452_STATUS 0x00
-#define MMA8452_OUT_X 0x01 /* MSB first, 12-bit */
-#define MMA8452_OUT_Y 0x03
-#define MMA8452_OUT_Z 0x05
-#define MMA8452_WHO_AM_I 0x0d
-#define MMA8452_DATA_CFG 0x0e
-#define MMA8452_OFF_X 0x2f
-#define MMA8452_OFF_Y 0x30
-#define MMA8452_OFF_Z 0x31
-#define MMA8452_CTRL_REG1 0x2a
-#define MMA8452_CTRL_REG2 0x2b
-
-#define MMA8452_STATUS_DRDY (BIT(2) | BIT(1) | BIT(0))
-
-#define MMA8452_CTRL_DR_MASK (BIT(5) | BIT(4) | BIT(3))
-#define MMA8452_CTRL_DR_SHIFT 3
-#define MMA8452_CTRL_DR_DEFAULT 0x4 /* 50 Hz sample frequency */
-#define MMA8452_CTRL_ACTIVE BIT(0)
-
-#define MMA8452_DATA_CFG_FS_MASK (BIT(1) | BIT(0))
-#define MMA8452_DATA_CFG_FS_2G 0
-#define MMA8452_DATA_CFG_FS_4G 1
-#define MMA8452_DATA_CFG_FS_8G 2
-
-#define MMA8452_DEVICE_ID 0x2a
+#include <linux/of_device.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_CHAN(chan) BIT(chan + 1)
+#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;
};
static int mma8452_drdy(struct mma8452_data *data)
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);
+
+ 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)
+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]);
+ len += scnprintf(buf + len, PAGE_SIZE - len, "%d.%06d ",
+ vals[n][0], vals[n][1]);
/* replace trailing space by newline */
buf[len - 1] = '\n';
}
static int mma8452_get_int_plus_micros_index(const int (*vals)[2], int n,
- int val, int val2)
+ int val, int val2)
{
while (n-- > 0)
if (val == vals[n][0] && val2 == vals[n][1])
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}
};
-/*
- * Hardware has fullscale of -2G, -4G, -8G corresponding to raw value -2048
- * The userspace interface uses m/s^2 and we declare micro units
- * So scale factor is given by:
- * g * N * 1000000 / 2048 for N = 2, 4, 8 and g=9.80665
- */
-static const int mma8452_scales[3][2] = {
- {0, 9577}, {0, 19154}, {0, 38307}
+/* 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)
+ struct device_attribute *attr,
+ char *buf)
{
return mma8452_show_int_plus_micros(buf, mma8452_samp_freq,
- ARRAY_SIZE(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 device_attribute *attr,
+ char *buf)
{
- return mma8452_show_int_plus_micros(buf, mma8452_scales,
- ARRAY_SIZE(mma8452_scales));
+ 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);
+ 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)
+ int val, int val2)
{
return mma8452_get_int_plus_micros_index(mma8452_samp_freq,
- ARRAY_SIZE(mma8452_samp_freq), val, val2);
+ ARRAY_SIZE(mma8452_samp_freq),
+ val, val2);
}
-static int mma8452_get_scale_index(struct mma8452_data *data,
- int val, int val2)
+static int mma8452_get_scale_index(struct mma8452_data *data, int val, int val2)
{
- return mma8452_get_int_plus_micros_index(mma8452_scales,
- ARRAY_SIZE(mma8452_scales), val, 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,
mutex_unlock(&data->lock);
if (ret < 0)
return ret;
- *val = sign_extend32(
- be16_to_cpu(buffer[chan->scan_index]) >> 4, 11);
+
+ *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 = mma8452_scales[i][0];
- *val2 = mma8452_scales[i][1];
+ *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 = (data->ctrl_reg1 & MMA8452_CTRL_DR_MASK) >>
- MMA8452_CTRL_DR_SHIFT;
+ 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);
+ 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);
+ 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);
+ data->ctrl_reg1);
}
static int mma8452_change_config(struct mma8452_data *data, u8 reg, u8 val)
ret = 0;
fail:
mutex_unlock(&data->lock);
+
return ret;
}
+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;
+ int i, ret;
if (iio_buffer_enabled(indio_dev))
return -EBUSY;
case IIO_CHAN_INFO_SAMP_FREQ:
i = mma8452_get_samp_freq_index(data, val, val2);
if (i < 0)
- return -EINVAL;
+ 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);
+ data->ctrl_reg1);
case IIO_CHAN_INFO_SCALE:
i = mma8452_get_scale_index(data, val, val2);
if (i < 0)
- return -EINVAL;
+ 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);
+ 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);
+
+ 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;
+
+ 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));
+}
+
+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;
+
+ val = i2c_smbus_read_byte_data(data->client, chip->ev_cfg);
+ if (val < 0)
+ return val;
+
+ if (state)
+ val |= BIT(chan->scan_index + chip->ev_cfg_chan_shift);
+ else
+ val &= ~BIT(chan->scan_index + chip->ev_cfg_chan_shift);
+
+ val |= chip->ev_cfg_ele;
+ val |= MMA8452_FF_MT_CFG_OAE;
+
+ return mma8452_change_config(data, chip->ev_cfg, val);
+}
+
+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 (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;
u8 buffer[16]; /* 3 16-bit channels + padding + ts */
int ret;
- ret = mma8452_read(data, (__be16 *) buffer);
+ ret = mma8452_read(data, (__be16 *)buffer);
if (ret < 0)
goto done;
iio_push_to_buffers_with_timestamp(indio_dev, buffer,
- iio_get_time_ns());
+ iio_get_time_ns());
done:
iio_trigger_notify_done(indio_dev->trig);
+
return IRQ_HANDLED;
}
-#define MMA8452_CHANNEL(axis, idx) { \
+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_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_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, \
.scan_index = idx, \
.scan_type = { \
.sign = 's', \
- .realbits = 12, \
+ .realbits = (bits), \
.storagebits = 16, \
- .shift = 4, \
+ .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, 0),
- MMA8452_CHANNEL(Y, 1),
- MMA8452_CHANNEL(Z, 2),
+ MMA8452_CHANNEL(X, 0, 12),
+ MMA8452_CHANNEL(Y, 1, 12),
+ MMA8452_CHANNEL(Z, 2, 12),
+ IIO_CHAN_SOFT_TIMESTAMP(3),
+};
+
+static const struct iio_chan_spec mma8453_channels[] = {
+ MMA8452_CHANNEL(X, 0, 10),
+ MMA8452_CHANNEL(Y, 1, 10),
+ MMA8452_CHANNEL(Z, 2, 10),
IIO_CHAN_SOFT_TIMESTAMP(3),
};
+static const struct iio_chan_spec mma8652_channels[] = {
+ MMA8652_CHANNEL(X, 0, 12),
+ MMA8652_CHANNEL(Y, 1, 12),
+ MMA8652_CHANNEL(Z, 2, 12),
+ IIO_CHAN_SOFT_TIMESTAMP(3),
+};
+
+static const struct iio_chan_spec mma8653_channels[] = {
+ MMA8652_CHANNEL(X, 0, 10),
+ MMA8652_CHANNEL(Y, 1, 10),
+ MMA8652_CHANNEL(Z, 2, 10),
+ IIO_CHAN_SOFT_TIMESTAMP(3),
+};
+
+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
};
.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;
- ret = i2c_smbus_read_byte_data(client, MMA8452_WHO_AM_I);
- if (ret < 0)
- return ret;
- if (ret != MMA8452_DEVICE_ID)
+ 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)
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 = mma8452_channels;
- indio_dev->num_channels = ARRAY_SIZE(mma8452_channels);
+ indio_dev->channels = data->chip_info->channels;
+ indio_dev->num_channels = data->chip_info->num_channels;
indio_dev->available_scan_masks = mma8452_scan_masks;
- 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);
+ 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);
+ data->data_cfg);
if (ret < 0)
return ret;
- ret = iio_triggered_buffer_setup(indio_dev, NULL,
- mma8452_trigger_handler, NULL);
+ /*
+ * 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;
+
+ /* Assume wired to INT1 pin */
+ ret = i2c_smbus_write_byte_data(client,
+ MMA8452_CTRL_REG5,
+ supported_interrupts);
+ if (ret < 0)
+ return ret;
+
+ 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;
+
return 0;
buffer_cleanup:
iio_triggered_buffer_cleanup(indio_dev);
+
+trigger_cleanup:
+ mma8452_trigger_cleanup(indio_dev);
+
return ret;
}
iio_device_unregister(indio_dev);
iio_triggered_buffer_cleanup(indio_dev);
+ mma8452_trigger_cleanup(indio_dev);
mma8452_standby(iio_priv(indio_dev));
return 0;
#endif
static const struct i2c_device_id mma8452_id[] = {
- { "mma8452", 0 },
+ { "mma8452", mma8452 },
+ { "mma8453", mma8453 },
+ { "mma8652", mma8652 },
+ { "mma8653", mma8653 },
{ }
};
MODULE_DEVICE_TABLE(i2c, mma8452_id);
-static const struct of_device_id mma8452_dt_ids[] = {
- { .compatible = "fsl,mma8452" },
- { }
-};
-
static struct i2c_driver mma8452_driver = {
.driver = {
.name = "mma8452",
Code Review / kvmfornfv.git / blobdiff