iio: imu: kmx61: Add support for any motion trigger
We use WUFE (Wake Up from Sleep Engine) and BTSE (Back to Sleep Engine) to detect general motion input. Signed-off-by: Daniel Baluta <daniel.baluta@intel.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Daniel Baluta
Jonathan Cameron
parent
c3a23ecc09
commit
fd3ae7a9f2
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@ -20,6 +20,7 @@
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#include <linux/pm_runtime.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/events.h>
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#include <linux/iio/trigger.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/triggered_buffer.h>
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@ -30,6 +31,8 @@
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#define KMX61_IRQ_NAME "kmx61_event"
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#define KMX61_REG_WHO_AM_I 0x00
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#define KMX61_REG_INS1 0x01
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#define KMX61_REG_INS2 0x02
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/*
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* three 16-bit accelerometer output registers for X/Y/Z axis
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@ -63,20 +66,36 @@
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#define KMX61_REG_INL 0x28
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#define KMX61_REG_STBY 0x29
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#define KMX61_REG_CTRL1 0x2A
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#define KMX61_REG_CTRL2 0x2B
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#define KMX61_REG_ODCNTL 0x2C
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#define KMX61_REG_INC1 0x2D
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#define KMX61_REG_WUF_THRESH 0x3D
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#define KMX61_REG_WUF_TIMER 0x3E
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#define KMX61_ACC_STBY_BIT BIT(0)
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#define KMX61_MAG_STBY_BIT BIT(1)
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#define KMX61_ACT_STBY_BIT BIT(7)
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#define KMX61_ALL_STBY (KMX61_ACC_STBY_BIT | KMX61_MAG_STBY_BIT)
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#define KMX61_REG_INS1_BIT_WUFS BIT(1)
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#define KMX61_REG_INS2_BIT_ZP BIT(0)
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#define KMX61_REG_INS2_BIT_ZN BIT(1)
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#define KMX61_REG_INS2_BIT_YP BIT(2)
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#define KMX61_REG_INS2_BIT_YN BIT(3)
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#define KMX61_REG_INS2_BIT_XP BIT(4)
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#define KMX61_REG_INS2_BIT_XN BIT(5)
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#define KMX61_REG_CTRL1_GSEL_MASK 0x03
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#define KMX61_REG_CTRL1_BIT_RES BIT(4)
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#define KMX61_REG_CTRL1_BIT_DRDYE BIT(5)
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#define KMX61_REG_CTRL1_BIT_WUFE BIT(6)
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#define KMX61_REG_CTRL1_BIT_BTSE BIT(7)
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#define KMX61_REG_INC1_BIT_WUFS BIT(0)
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#define KMX61_REG_INC1_BIT_DRDYM BIT(1)
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#define KMX61_REG_INC1_BIT_DRDYA BIT(2)
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#define KMX61_REG_INC1_BIT_IEN BIT(5)
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@ -86,6 +105,11 @@
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#define KMX61_ACC_ODR_MASK 0x0F
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#define KMX61_MAG_ODR_MASK 0xF0
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#define KMX61_OWUF_MASK 0x7
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#define KMX61_DEFAULT_WAKE_THRESH 1
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#define KMX61_DEFAULT_WAKE_DURATION 1
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#define KMX61_SLEEP_DELAY_MS 2000
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#define KMX61_CHIP_ID 0x12
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@ -111,11 +135,16 @@ struct kmx61_data {
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/* config bits */
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u8 range;
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u8 odr_bits;
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u8 wake_thresh;
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u8 wake_duration;
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/* accelerometer specific data */
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struct iio_dev *acc_indio_dev;
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struct iio_trigger *acc_dready_trig;
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struct iio_trigger *motion_trig;
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bool acc_dready_trig_on;
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bool motion_trig_on;
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bool ev_enable_state;
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/* magnetometer specific data */
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struct iio_dev *mag_indio_dev;
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@ -154,6 +183,23 @@ static const struct {
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{3, 125000, 0x0A},
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{6, 250000, 0x0B} };
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static const struct {
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int val;
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int val2;
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int odr_bits;
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} kmx61_wake_up_odr_table[] = { {0, 781000, 0x00},
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{1, 563000, 0x01},
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{3, 125000, 0x02},
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{6, 250000, 0x03},
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{12, 500000, 0x04},
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{25, 0, 0x05},
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{50, 0, 0x06},
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{100, 0, 0x06},
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{200, 0, 0x06},
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{400, 0, 0x06},
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{800, 0, 0x06},
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{1600, 0, 0x06} };
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static IIO_CONST_ATTR(accel_scale_available, "0.009582 0.019163 0.038326");
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static IIO_CONST_ATTR(magn_scale_available, "0.001465");
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static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
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@ -179,6 +225,14 @@ static const struct attribute_group kmx61_mag_attribute_group = {
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.attrs = kmx61_mag_attributes,
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};
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static const struct iio_event_spec kmx61_event = {
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.type = IIO_EV_TYPE_THRESH,
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.dir = IIO_EV_DIR_EITHER,
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.mask_separate = BIT(IIO_EV_INFO_VALUE) |
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BIT(IIO_EV_INFO_ENABLE) |
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BIT(IIO_EV_INFO_PERIOD),
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};
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#define KMX61_ACC_CHAN(_axis) { \
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.type = IIO_ACCEL, \
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.modified = 1, \
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@ -195,6 +249,8 @@ static const struct attribute_group kmx61_mag_attribute_group = {
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.shift = 4, \
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.endianness = IIO_LE, \
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}, \
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.event_spec = &kmx61_event, \
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.num_event_specs = 1 \
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}
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#define KMX61_MAG_CHAN(_axis) { \
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@ -250,6 +306,31 @@ static int kmx61_convert_freq_to_bit(int val, int val2)
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return -EINVAL;
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}
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static int kmx61_convert_bit_to_freq(u8 odr_bits, int *val, int *val2)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(kmx61_samp_freq_table); i++)
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if (odr_bits == kmx61_samp_freq_table[i].odr_bits) {
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*val = kmx61_samp_freq_table[i].val;
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*val2 = kmx61_samp_freq_table[i].val2;
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return 0;
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}
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return -EINVAL;
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}
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static int kmx61_convert_wake_up_odr_to_bit(int val, int val2)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(kmx61_wake_up_odr_table); ++i)
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if (kmx61_wake_up_odr_table[i].val == val &&
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kmx61_wake_up_odr_table[i].val2 == val2)
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return kmx61_wake_up_odr_table[i].odr_bits;
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return -EINVAL;
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}
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/**
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* kmx61_set_mode() - set KMX61 device operating mode
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* @data - kmx61 device private data pointer
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@ -338,6 +419,21 @@ static int kmx61_get_mode(struct kmx61_data *data, u8 *mode, u8 device)
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return 0;
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}
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int kmx61_set_wake_up_odr(struct kmx61_data *data, int val, int val2)
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{
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int ret, odr_bits;
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odr_bits = kmx61_convert_wake_up_odr_to_bit(val, val2);
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if (odr_bits < 0)
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return odr_bits;
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ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_CTRL2,
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odr_bits);
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if (ret < 0)
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dev_err(&data->client->dev, "Error writing reg_ctrl2\n");
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return ret;
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}
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static int kmx61_set_odr(struct kmx61_data *data, int val, int val2, u8 device)
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{
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int ret;
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@ -369,6 +465,12 @@ static int kmx61_set_odr(struct kmx61_data *data, int val, int val2, u8 device)
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if (ret < 0)
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return ret;
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if (device & KMX61_ACC) {
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ret = kmx61_set_wake_up_odr(data, val, val2);
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if (ret)
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return ret;
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}
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return kmx61_set_mode(data, mode, KMX61_ACC | KMX61_MAG, true);
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}
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@ -449,7 +551,7 @@ static int kmx61_set_scale(struct kmx61_data *data, u16 uscale)
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static int kmx61_chip_init(struct kmx61_data *data)
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{
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int ret;
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int ret, val, val2;
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ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_WHO_AM_I);
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if (ret < 0) {
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@ -476,11 +578,23 @@ static int kmx61_chip_init(struct kmx61_data *data)
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}
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data->odr_bits = ret;
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/* set output data rate for wake up (motion detection) function */
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ret = kmx61_convert_bit_to_freq(data->odr_bits, &val, &val2);
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if (ret < 0)
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return ret;
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ret = kmx61_set_wake_up_odr(data, val, val2);
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if (ret < 0)
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return ret;
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/* set acc/magn to OPERATION mode */
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ret = kmx61_set_mode(data, 0, KMX61_ACC | KMX61_MAG, true);
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if (ret < 0)
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return ret;
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data->wake_thresh = KMX61_DEFAULT_WAKE_THRESH;
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data->wake_duration = KMX61_DEFAULT_WAKE_DURATION;
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return 0;
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}
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@ -547,6 +661,87 @@ static int kmx61_setup_new_data_interrupt(struct kmx61_data *data,
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return 0;
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}
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static int kmx61_chip_update_thresholds(struct kmx61_data *data)
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{
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int ret;
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ret = i2c_smbus_write_byte_data(data->client,
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KMX61_REG_WUF_TIMER,
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data->wake_duration);
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if (ret < 0) {
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dev_err(&data->client->dev, "Errow writing reg_wuf_timer\n");
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return ret;
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}
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ret = i2c_smbus_write_byte_data(data->client,
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KMX61_REG_WUF_THRESH,
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data->wake_thresh);
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if (ret < 0) {
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dev_err(&data->client->dev, "Error writing reg_wuf_thresh\n");
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return ret;
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}
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return 0;
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}
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static int kmx61_setup_any_motion_interrupt(struct kmx61_data *data,
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bool status, u8 device)
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{
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u8 mode;
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int ret;
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ret = kmx61_get_mode(data, &mode, KMX61_ACC | KMX61_MAG);
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if (ret < 0)
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return ret;
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ret = kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, true);
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if (ret < 0)
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return ret;
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ret = kmx61_chip_update_thresholds(data);
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if (ret < 0)
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return ret;
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ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_INC1);
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if (ret < 0) {
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dev_err(&data->client->dev, "Error reading reg_inc1\n");
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return ret;
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}
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if (status)
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ret |= (KMX61_REG_INC1_BIT_IEN | KMX61_REG_INC1_BIT_WUFS);
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else
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ret &= ~(KMX61_REG_INC1_BIT_IEN | KMX61_REG_INC1_BIT_WUFS);
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ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_INC1, ret);
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if (ret < 0) {
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dev_err(&data->client->dev, "Error writing reg_inc1\n");
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return ret;
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}
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ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_CTRL1);
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if (ret < 0) {
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dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
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return ret;
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}
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if (status)
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ret |= KMX61_REG_CTRL1_BIT_WUFE | KMX61_REG_CTRL1_BIT_BTSE;
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else
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ret &= ~(KMX61_REG_CTRL1_BIT_WUFE | KMX61_REG_CTRL1_BIT_BTSE);
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ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_CTRL1, ret);
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if (ret < 0) {
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dev_err(&data->client->dev, "Error writing reg_ctrl1\n");
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return ret;
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}
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mode |= KMX61_ACT_STBY_BIT;
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ret = kmx61_set_mode(data, mode, KMX61_ACC | KMX61_MAG, true);
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if (ret)
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return ret;
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return 0;
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}
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/**
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* kmx61_set_power_state() - set power state for kmx61 @device
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* @data - kmx61 device private pointer
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@ -707,12 +902,111 @@ static int kmx61_write_raw(struct iio_dev *indio_dev,
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}
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}
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static int kmx61_read_event(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir,
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enum iio_event_info info,
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int *val, int *val2)
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{
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struct kmx61_data *data = kmx61_get_data(indio_dev);
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*val2 = 0;
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switch (info) {
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case IIO_EV_INFO_VALUE:
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*val = data->wake_thresh;
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break;
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case IIO_EV_INFO_PERIOD:
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*val = data->wake_duration;
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break;
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default:
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return -EINVAL;
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}
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return IIO_VAL_INT;
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}
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static int kmx61_write_event(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir,
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enum iio_event_info info,
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int val, int val2)
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{
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struct kmx61_data *data = kmx61_get_data(indio_dev);
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if (data->ev_enable_state)
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return -EBUSY;
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switch (info) {
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case IIO_EV_INFO_VALUE:
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data->wake_thresh = val;
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break;
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case IIO_EV_INFO_PERIOD:
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data->wake_duration = val;
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break;
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default:
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return -EINVAL;
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}
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return IIO_VAL_INT;
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}
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static int kmx61_read_event_config(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir)
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{
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struct kmx61_data *data = kmx61_get_data(indio_dev);
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return data->ev_enable_state;
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}
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static int kmx61_write_event_config(struct iio_dev *indio_dev,
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const struct iio_chan_spec *chan,
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enum iio_event_type type,
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enum iio_event_direction dir,
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int state)
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{
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struct kmx61_data *data = kmx61_get_data(indio_dev);
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int ret;
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if (state && data->ev_enable_state)
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return 0;
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mutex_lock(&data->lock);
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if (!state && data->motion_trig_on) {
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data->ev_enable_state = 0;
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mutex_unlock(&data->lock);
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return 0;
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}
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ret = kmx61_set_power_state(data, state, KMX61_ACC);
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if (ret < 0) {
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mutex_unlock(&data->lock);
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return ret;
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}
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ret = kmx61_setup_any_motion_interrupt(data, state, KMX61_ACC);
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if (ret < 0) {
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kmx61_set_power_state(data, false, KMX61_ACC);
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mutex_unlock(&data->lock);
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return ret;
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}
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data->ev_enable_state = state;
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mutex_unlock(&data->lock);
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return 0;
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}
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static int kmx61_acc_validate_trigger(struct iio_dev *indio_dev,
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struct iio_trigger *trig)
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{
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struct kmx61_data *data = kmx61_get_data(indio_dev);
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if (data->acc_dready_trig != trig)
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if (data->acc_dready_trig != trig && data->motion_trig != trig)
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return -EINVAL;
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return 0;
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@ -734,6 +1028,10 @@ static const struct iio_info kmx61_acc_info = {
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.read_raw = kmx61_read_raw,
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.write_raw = kmx61_write_raw,
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.attrs = &kmx61_acc_attribute_group,
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.read_event_value = kmx61_read_event,
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.write_event_value = kmx61_write_event,
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.read_event_config = kmx61_read_event_config,
|
||||
.write_event_config = kmx61_write_event_config,
|
||||
.validate_trigger = kmx61_acc_validate_trigger,
|
||||
};
|
||||
|
||||
|
|
@ -753,11 +1051,18 @@ static int kmx61_data_rdy_trigger_set_state(struct iio_trigger *trig,
|
|||
u8 device;
|
||||
|
||||
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
|
||||
struct kmx61_data *data = iio_priv(indio_dev);
|
||||
struct kmx61_data *data = kmx61_get_data(indio_dev);
|
||||
|
||||
mutex_lock(&data->lock);
|
||||
|
||||
if (data->acc_dready_trig == trig)
|
||||
if (!state && data->ev_enable_state && data->motion_trig_on) {
|
||||
data->motion_trig_on = false;
|
||||
mutex_unlock(&data->lock);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
if (data->acc_dready_trig == trig || data->motion_trig)
|
||||
device = KMX61_ACC;
|
||||
else
|
||||
device = KMX61_MAG;
|
||||
|
|
@ -768,7 +1073,10 @@ static int kmx61_data_rdy_trigger_set_state(struct iio_trigger *trig,
|
|||
return ret;
|
||||
}
|
||||
|
||||
ret = kmx61_setup_new_data_interrupt(data, state, device);
|
||||
if (data->acc_dready_trig == trig || data->mag_dready_trig == trig)
|
||||
ret = kmx61_setup_new_data_interrupt(data, state, device);
|
||||
else
|
||||
ret = kmx61_setup_any_motion_interrupt(data, state, KMX61_ACC);
|
||||
if (ret < 0) {
|
||||
kmx61_set_power_state(data, false, device);
|
||||
mutex_unlock(&data->lock);
|
||||
|
|
@ -777,8 +1085,10 @@ static int kmx61_data_rdy_trigger_set_state(struct iio_trigger *trig,
|
|||
|
||||
if (data->acc_dready_trig == trig)
|
||||
data->acc_dready_trig_on = state;
|
||||
else
|
||||
else if (data->mag_dready_trig == trig)
|
||||
data->mag_dready_trig_on = state;
|
||||
else
|
||||
data->motion_trig_on = state;
|
||||
|
||||
mutex_unlock(&data->lock);
|
||||
|
||||
|
|
@ -806,6 +1116,99 @@ static const struct iio_trigger_ops kmx61_trigger_ops = {
|
|||
.owner = THIS_MODULE,
|
||||
};
|
||||
|
||||
static irqreturn_t kmx61_event_handler(int irq, void *private)
|
||||
{
|
||||
struct kmx61_data *data = private;
|
||||
struct iio_dev *indio_dev = data->acc_indio_dev;
|
||||
int ret;
|
||||
|
||||
ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_INS1);
|
||||
if (ret < 0) {
|
||||
dev_err(&data->client->dev, "Error reading reg_ins1\n");
|
||||
goto ack_intr;
|
||||
}
|
||||
|
||||
if (ret & KMX61_REG_INS1_BIT_WUFS) {
|
||||
ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_INS2);
|
||||
if (ret < 0) {
|
||||
dev_err(&data->client->dev, "Error reading reg_ins2\n");
|
||||
goto ack_intr;
|
||||
}
|
||||
|
||||
if (ret & KMX61_REG_INS2_BIT_XN)
|
||||
iio_push_event(indio_dev,
|
||||
IIO_MOD_EVENT_CODE(IIO_ACCEL,
|
||||
0,
|
||||
IIO_MOD_X,
|
||||
IIO_EV_TYPE_THRESH,
|
||||
IIO_EV_DIR_FALLING),
|
||||
0);
|
||||
|
||||
if (ret & KMX61_REG_INS2_BIT_XP)
|
||||
iio_push_event(indio_dev,
|
||||
IIO_MOD_EVENT_CODE(IIO_ACCEL,
|
||||
0,
|
||||
IIO_MOD_X,
|
||||
IIO_EV_TYPE_THRESH,
|
||||
IIO_EV_DIR_RISING),
|
||||
0);
|
||||
|
||||
if (ret & KMX61_REG_INS2_BIT_YN)
|
||||
iio_push_event(indio_dev,
|
||||
IIO_MOD_EVENT_CODE(IIO_ACCEL,
|
||||
0,
|
||||
IIO_MOD_Y,
|
||||
IIO_EV_TYPE_THRESH,
|
||||
IIO_EV_DIR_FALLING),
|
||||
0);
|
||||
|
||||
if (ret & KMX61_REG_INS2_BIT_YP)
|
||||
iio_push_event(indio_dev,
|
||||
IIO_MOD_EVENT_CODE(IIO_ACCEL,
|
||||
0,
|
||||
IIO_MOD_Y,
|
||||
IIO_EV_TYPE_THRESH,
|
||||
IIO_EV_DIR_RISING),
|
||||
0);
|
||||
|
||||
if (ret & KMX61_REG_INS2_BIT_ZN)
|
||||
iio_push_event(indio_dev,
|
||||
IIO_MOD_EVENT_CODE(IIO_ACCEL,
|
||||
0,
|
||||
IIO_MOD_Z,
|
||||
IIO_EV_TYPE_THRESH,
|
||||
IIO_EV_DIR_FALLING),
|
||||
0);
|
||||
|
||||
if (ret & KMX61_REG_INS2_BIT_ZP)
|
||||
iio_push_event(indio_dev,
|
||||
IIO_MOD_EVENT_CODE(IIO_ACCEL,
|
||||
0,
|
||||
IIO_MOD_Z,
|
||||
IIO_EV_TYPE_THRESH,
|
||||
IIO_EV_DIR_RISING),
|
||||
0);
|
||||
}
|
||||
|
||||
ack_intr:
|
||||
ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_CTRL1);
|
||||
if (ret < 0)
|
||||
dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
|
||||
|
||||
ret |= KMX61_REG_CTRL1_BIT_RES;
|
||||
ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_CTRL1, ret);
|
||||
if (ret < 0)
|
||||
dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
|
||||
|
||||
ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_INL);
|
||||
if (ret < 0)
|
||||
dev_err(&data->client->dev, "Error reading reg_inl\n");
|
||||
|
||||
ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_INS1);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static irqreturn_t kmx61_data_rdy_trig_poll(int irq, void *private)
|
||||
{
|
||||
struct kmx61_data *data = private;
|
||||
|
|
@ -815,6 +1218,11 @@ static irqreturn_t kmx61_data_rdy_trig_poll(int irq, void *private)
|
|||
if (data->mag_dready_trig_on)
|
||||
iio_trigger_poll(data->mag_dready_trig);
|
||||
|
||||
if (data->motion_trig_on)
|
||||
iio_trigger_poll(data->motion_trig);
|
||||
|
||||
if (data->ev_enable_state)
|
||||
return IRQ_WAKE_THREAD;
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
|
|
@ -982,7 +1390,7 @@ static int kmx61_probe(struct i2c_client *client,
|
|||
if (client->irq >= 0) {
|
||||
ret = devm_request_threaded_irq(&client->dev, client->irq,
|
||||
kmx61_data_rdy_trig_poll,
|
||||
NULL,
|
||||
kmx61_event_handler,
|
||||
IRQF_TRIGGER_RISING,
|
||||
KMX61_IRQ_NAME,
|
||||
data);
|
||||
|
|
@ -1003,6 +1411,14 @@ static int kmx61_probe(struct i2c_client *client,
|
|||
goto err_trigger_unregister;
|
||||
}
|
||||
|
||||
data->motion_trig =
|
||||
kmx61_trigger_setup(data, data->acc_indio_dev,
|
||||
"any-motion");
|
||||
if (IS_ERR(data->motion_trig)) {
|
||||
ret = PTR_ERR(data->motion_trig);
|
||||
goto err_trigger_unregister;
|
||||
}
|
||||
|
||||
ret = iio_triggered_buffer_setup(data->acc_indio_dev,
|
||||
&iio_pollfunc_store_time,
|
||||
kmx61_trigger_handler,
|
||||
|
|
@ -1060,6 +1476,8 @@ err_trigger_unregister:
|
|||
iio_trigger_unregister(data->acc_dready_trig);
|
||||
if (data->mag_dready_trig)
|
||||
iio_trigger_unregister(data->mag_dready_trig);
|
||||
if (data->motion_trig)
|
||||
iio_trigger_unregister(data->motion_trig);
|
||||
err_chip_uninit:
|
||||
kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, true);
|
||||
return ret;
|
||||
|
|
@ -1081,6 +1499,7 @@ static int kmx61_remove(struct i2c_client *client)
|
|||
iio_triggered_buffer_cleanup(data->mag_indio_dev);
|
||||
iio_trigger_unregister(data->acc_dready_trig);
|
||||
iio_trigger_unregister(data->mag_dready_trig);
|
||||
iio_trigger_unregister(data->motion_trig);
|
||||
}
|
||||
|
||||
mutex_lock(&data->lock);
|
||||
|
|
|
|||
Loading…
Reference in New Issue