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linux/drivers/iio/imu/kmx61.c
Jonathan Cameron eca8523a38 iio:trigger: rename try_reenable() to reenable() plus return void 
As we no longer support a try again if we cannot reenable the trigger
rename the function to reflect this.   Also we don't do anything with
the value returned so stop it returning anything.  For the few drivers
that didn't already print an error message in this patch, add such
a print.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: Christian Oder <me@myself5.de>
Cc: Eugen Hristev <eugen.hristev@microchip.com>
Cc: Nishant Malpani <nish.malpani25@gmail.com>
Cc: Daniel Baluta <daniel.baluta@oss.nxp.com>
Link: https://lore.kernel.org/r/20200920132548.196452-3-jic23@kernel.org
2020-12-03 19:40:26 +00:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* KMX61 - Kionix 6-axis Accelerometer/Magnetometer
*
* Copyright (c) 2014, Intel Corporation.
*
* IIO driver for KMX61 (7-bit I2C slave address 0x0E or 0x0F).
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/acpi.h>
#include <linux/interrupt.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
#include <linux/iio/trigger.h>
#include <linux/iio/buffer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>
#define KMX61_DRV_NAME "kmx61"
#define KMX61_IRQ_NAME "kmx61_event"
#define KMX61_REG_WHO_AM_I 0x00
#define KMX61_REG_INS1 0x01
#define KMX61_REG_INS2 0x02
/*
* three 16-bit accelerometer output registers for X/Y/Z axis
* we use only XOUT_L as a base register, all other addresses
* can be obtained by applying an offset and are provided here
* only for clarity.
*/
#define KMX61_ACC_XOUT_L 0x0A
#define KMX61_ACC_XOUT_H 0x0B
#define KMX61_ACC_YOUT_L 0x0C
#define KMX61_ACC_YOUT_H 0x0D
#define KMX61_ACC_ZOUT_L 0x0E
#define KMX61_ACC_ZOUT_H 0x0F
/*
* one 16-bit temperature output register
*/
#define KMX61_TEMP_L 0x10
#define KMX61_TEMP_H 0x11
/*
* three 16-bit magnetometer output registers for X/Y/Z axis
*/
#define KMX61_MAG_XOUT_L 0x12
#define KMX61_MAG_XOUT_H 0x13
#define KMX61_MAG_YOUT_L 0x14
#define KMX61_MAG_YOUT_H 0x15
#define KMX61_MAG_ZOUT_L 0x16
#define KMX61_MAG_ZOUT_H 0x17
#define KMX61_REG_INL 0x28
#define KMX61_REG_STBY 0x29
#define KMX61_REG_CTRL1 0x2A
#define KMX61_REG_CTRL2 0x2B
#define KMX61_REG_ODCNTL 0x2C
#define KMX61_REG_INC1 0x2D
#define KMX61_REG_WUF_THRESH 0x3D
#define KMX61_REG_WUF_TIMER 0x3E
#define KMX61_ACC_STBY_BIT BIT(0)
#define KMX61_MAG_STBY_BIT BIT(1)
#define KMX61_ACT_STBY_BIT BIT(7)
#define KMX61_ALL_STBY (KMX61_ACC_STBY_BIT | KMX61_MAG_STBY_BIT)
#define KMX61_REG_INS1_BIT_WUFS BIT(1)
#define KMX61_REG_INS2_BIT_ZP BIT(0)
#define KMX61_REG_INS2_BIT_ZN BIT(1)
#define KMX61_REG_INS2_BIT_YP BIT(2)
#define KMX61_REG_INS2_BIT_YN BIT(3)
#define KMX61_REG_INS2_BIT_XP BIT(4)
#define KMX61_REG_INS2_BIT_XN BIT(5)
#define KMX61_REG_CTRL1_GSEL_MASK 0x03
#define KMX61_REG_CTRL1_BIT_RES BIT(4)
#define KMX61_REG_CTRL1_BIT_DRDYE BIT(5)
#define KMX61_REG_CTRL1_BIT_WUFE BIT(6)
#define KMX61_REG_CTRL1_BIT_BTSE BIT(7)
#define KMX61_REG_INC1_BIT_WUFS BIT(0)
#define KMX61_REG_INC1_BIT_DRDYM BIT(1)
#define KMX61_REG_INC1_BIT_DRDYA BIT(2)
#define KMX61_REG_INC1_BIT_IEN BIT(5)
#define KMX61_ACC_ODR_SHIFT 0
#define KMX61_MAG_ODR_SHIFT 4
#define KMX61_ACC_ODR_MASK 0x0F
#define KMX61_MAG_ODR_MASK 0xF0
#define KMX61_OWUF_MASK 0x7
#define KMX61_DEFAULT_WAKE_THRESH 1
#define KMX61_DEFAULT_WAKE_DURATION 1
#define KMX61_SLEEP_DELAY_MS 2000
#define KMX61_CHIP_ID 0x12
/* KMX61 devices */
#define KMX61_ACC 0x01
#define KMX61_MAG 0x02
struct kmx61_data {
struct i2c_client *client;
/* serialize access to non-atomic ops, e.g set_mode */
struct mutex lock;
/* standby state */
bool acc_stby;
bool mag_stby;
/* power state */
bool acc_ps;
bool mag_ps;
/* config bits */
u8 range;
u8 odr_bits;
u8 wake_thresh;
u8 wake_duration;
/* accelerometer specific data */
struct iio_dev *acc_indio_dev;
struct iio_trigger *acc_dready_trig;
struct iio_trigger *motion_trig;
bool acc_dready_trig_on;
bool motion_trig_on;
bool ev_enable_state;
/* magnetometer specific data */
struct iio_dev *mag_indio_dev;
struct iio_trigger *mag_dready_trig;
bool mag_dready_trig_on;
};
enum kmx61_range {
KMX61_RANGE_2G,
KMX61_RANGE_4G,
KMX61_RANGE_8G,
};
enum kmx61_axis {
KMX61_AXIS_X,
KMX61_AXIS_Y,
KMX61_AXIS_Z,
};
static const u16 kmx61_uscale_table[] = {9582, 19163, 38326};
static const struct {
int val;
int val2;
} kmx61_samp_freq_table[] = { {12, 500000},
{25, 0},
{50, 0},
{100, 0},
{200, 0},
{400, 0},
{800, 0},
{1600, 0},
{0, 781000},
{1, 563000},
{3, 125000},
{6, 250000} };
static const struct {
int val;
int val2;
int odr_bits;
} kmx61_wake_up_odr_table[] = { {0, 781000, 0x00},
{1, 563000, 0x01},
{3, 125000, 0x02},
{6, 250000, 0x03},
{12, 500000, 0x04},
{25, 0, 0x05},
{50, 0, 0x06},
{100, 0, 0x06},
{200, 0, 0x06},
{400, 0, 0x06},
{800, 0, 0x06},
{1600, 0, 0x06} };
static IIO_CONST_ATTR(accel_scale_available, "0.009582 0.019163 0.038326");
static IIO_CONST_ATTR(magn_scale_available, "0.001465");
static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
"0.781000 1.563000 3.125000 6.250000 12.500000 25 50 100 200 400 800");
static struct attribute *kmx61_acc_attributes[] = {
&iio_const_attr_accel_scale_available.dev_attr.attr,
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
NULL,
};
static struct attribute *kmx61_mag_attributes[] = {
&iio_const_attr_magn_scale_available.dev_attr.attr,
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
NULL,
};
static const struct attribute_group kmx61_acc_attribute_group = {
.attrs = kmx61_acc_attributes,
};
static const struct attribute_group kmx61_mag_attribute_group = {
.attrs = kmx61_mag_attributes,
};
static const struct iio_event_spec kmx61_event = {
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_EITHER,
.mask_separate = BIT(IIO_EV_INFO_VALUE) |
BIT(IIO_EV_INFO_ENABLE) |
BIT(IIO_EV_INFO_PERIOD),
};
#define KMX61_ACC_CHAN(_axis) { \
.type = IIO_ACCEL, \
.modified = 1, \
.channel2 = IIO_MOD_ ## _axis, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.address = KMX61_ACC, \
.scan_index = KMX61_AXIS_ ## _axis, \
.scan_type = { \
.sign = 's', \
.realbits = 12, \
.storagebits = 16, \
.shift = 4, \
.endianness = IIO_LE, \
}, \
.event_spec = &kmx61_event, \
.num_event_specs = 1 \
}
#define KMX61_MAG_CHAN(_axis) { \
.type = IIO_MAGN, \
.modified = 1, \
.channel2 = IIO_MOD_ ## _axis, \
.address = KMX61_MAG, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.scan_index = KMX61_AXIS_ ## _axis, \
.scan_type = { \
.sign = 's', \
.realbits = 14, \
.storagebits = 16, \
.shift = 2, \
.endianness = IIO_LE, \
}, \
}
static const struct iio_chan_spec kmx61_acc_channels[] = {
KMX61_ACC_CHAN(X),
KMX61_ACC_CHAN(Y),
KMX61_ACC_CHAN(Z),
};
static const struct iio_chan_spec kmx61_mag_channels[] = {
KMX61_MAG_CHAN(X),
KMX61_MAG_CHAN(Y),
KMX61_MAG_CHAN(Z),
};
static void kmx61_set_data(struct iio_dev *indio_dev, struct kmx61_data *data)
{
struct kmx61_data **priv = iio_priv(indio_dev);
*priv = data;
}
static struct kmx61_data *kmx61_get_data(struct iio_dev *indio_dev)
{
return *(struct kmx61_data **)iio_priv(indio_dev);
}
static int kmx61_convert_freq_to_bit(int val, int val2)
{
int i;
for (i = 0; i < ARRAY_SIZE(kmx61_samp_freq_table); i++)
if (val == kmx61_samp_freq_table[i].val &&
val2 == kmx61_samp_freq_table[i].val2)
return i;
return -EINVAL;
}
static int kmx61_convert_wake_up_odr_to_bit(int val, int val2)
{
int i;
for (i = 0; i < ARRAY_SIZE(kmx61_wake_up_odr_table); ++i)
if (kmx61_wake_up_odr_table[i].val == val &&
kmx61_wake_up_odr_table[i].val2 == val2)
return kmx61_wake_up_odr_table[i].odr_bits;
return -EINVAL;
}
/**
* kmx61_set_mode() - set KMX61 device operating mode
* @data: kmx61 device private data pointer
* @mode: bitmask, indicating operating mode for @device
* @device: bitmask, indicating device for which @mode needs to be set
* @update: update stby bits stored in device's private @data
*
* For each sensor (accelerometer/magnetometer) there are two operating modes
* STANDBY and OPERATION. Neither accel nor magn can be disabled independently
* if they are both enabled. Internal sensors state is saved in acc_stby and
* mag_stby members of driver's private @data.
*/
static int kmx61_set_mode(struct kmx61_data *data, u8 mode, u8 device,
bool update)
{
int ret;
int acc_stby = -1, mag_stby = -1;
ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_STBY);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading reg_stby\n");
return ret;
}
if (device & KMX61_ACC) {
if (mode & KMX61_ACC_STBY_BIT) {
ret |= KMX61_ACC_STBY_BIT;
acc_stby = 1;
} else {
ret &= ~KMX61_ACC_STBY_BIT;
acc_stby = 0;
}
}
if (device & KMX61_MAG) {
if (mode & KMX61_MAG_STBY_BIT) {
ret |= KMX61_MAG_STBY_BIT;
mag_stby = 1;
} else {
ret &= ~KMX61_MAG_STBY_BIT;
mag_stby = 0;
}
}
if (mode & KMX61_ACT_STBY_BIT)
ret |= KMX61_ACT_STBY_BIT;
ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_STBY, ret);
if (ret < 0) {
dev_err(&data->client->dev, "Error writing reg_stby\n");
return ret;
}
if (acc_stby != -1 && update)
data->acc_stby = acc_stby;
if (mag_stby != -1 && update)
data->mag_stby = mag_stby;
return 0;
}
static int kmx61_get_mode(struct kmx61_data *data, u8 *mode, u8 device)
{
int ret;
ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_STBY);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading reg_stby\n");
return ret;
}
*mode = 0;
if (device & KMX61_ACC) {
if (ret & KMX61_ACC_STBY_BIT)
*mode |= KMX61_ACC_STBY_BIT;
else
*mode &= ~KMX61_ACC_STBY_BIT;
}
if (device & KMX61_MAG) {
if (ret & KMX61_MAG_STBY_BIT)
*mode |= KMX61_MAG_STBY_BIT;
else
*mode &= ~KMX61_MAG_STBY_BIT;
}
return 0;
}
static int kmx61_set_wake_up_odr(struct kmx61_data *data, int val, int val2)
{
int ret, odr_bits;
odr_bits = kmx61_convert_wake_up_odr_to_bit(val, val2);
if (odr_bits < 0)
return odr_bits;
ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_CTRL2,
odr_bits);
if (ret < 0)
dev_err(&data->client->dev, "Error writing reg_ctrl2\n");
return ret;
}
static int kmx61_set_odr(struct kmx61_data *data, int val, int val2, u8 device)
{
int ret;
u8 mode;
int lodr_bits, odr_bits;
ret = kmx61_get_mode(data, &mode, KMX61_ACC | KMX61_MAG);
if (ret < 0)
return ret;
lodr_bits = kmx61_convert_freq_to_bit(val, val2);
if (lodr_bits < 0)
return lodr_bits;
/* To change ODR, accel and magn must be in STDBY */
ret = kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG,
true);
if (ret < 0)
return ret;
odr_bits = 0;
if (device & KMX61_ACC)
odr_bits |= lodr_bits << KMX61_ACC_ODR_SHIFT;
if (device & KMX61_MAG)
odr_bits |= lodr_bits << KMX61_MAG_ODR_SHIFT;
ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_ODCNTL,
odr_bits);
if (ret < 0)
return ret;
data->odr_bits = odr_bits;
if (device & KMX61_ACC) {
ret = kmx61_set_wake_up_odr(data, val, val2);
if (ret)
return ret;
}
return kmx61_set_mode(data, mode, KMX61_ACC | KMX61_MAG, true);
}
static int kmx61_get_odr(struct kmx61_data *data, int *val, int *val2,
u8 device)
{
u8 lodr_bits;
if (device & KMX61_ACC)
lodr_bits = (data->odr_bits >> KMX61_ACC_ODR_SHIFT) &
KMX61_ACC_ODR_MASK;
else if (device & KMX61_MAG)
lodr_bits = (data->odr_bits >> KMX61_MAG_ODR_SHIFT) &
KMX61_MAG_ODR_MASK;
else
return -EINVAL;
if (lodr_bits >= ARRAY_SIZE(kmx61_samp_freq_table))
return -EINVAL;
*val = kmx61_samp_freq_table[lodr_bits].val;
*val2 = kmx61_samp_freq_table[lodr_bits].val2;
return 0;
}
static int kmx61_set_range(struct kmx61_data *data, u8 range)
{
int ret;
ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_CTRL1);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
return ret;
}
ret &= ~KMX61_REG_CTRL1_GSEL_MASK;
ret |= range & KMX61_REG_CTRL1_GSEL_MASK;
ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_CTRL1, ret);
if (ret < 0) {
dev_err(&data->client->dev, "Error writing reg_ctrl1\n");
return ret;
}
data->range = range;
return 0;
}
static int kmx61_set_scale(struct kmx61_data *data, u16 uscale)
{
int ret, i;
u8 mode;
for (i = 0; i < ARRAY_SIZE(kmx61_uscale_table); i++) {
if (kmx61_uscale_table[i] == uscale) {
ret = kmx61_get_mode(data, &mode,
KMX61_ACC | KMX61_MAG);
if (ret < 0)
return ret;
ret = kmx61_set_mode(data, KMX61_ALL_STBY,
KMX61_ACC | KMX61_MAG, true);
if (ret < 0)
return ret;
ret = kmx61_set_range(data, i);
if (ret < 0)
return ret;
return kmx61_set_mode(data, mode,
KMX61_ACC | KMX61_MAG, true);
}
}
return -EINVAL;
}
static int kmx61_chip_init(struct kmx61_data *data)
{
int ret, val, val2;
ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_WHO_AM_I);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading who_am_i\n");
return ret;
}
if (ret != KMX61_CHIP_ID) {
dev_err(&data->client->dev,
"Wrong chip id, got %x expected %x\n",
ret, KMX61_CHIP_ID);
return -EINVAL;
}
/* set accel 12bit, 4g range */
ret = kmx61_set_range(data, KMX61_RANGE_4G);
if (ret < 0)
return ret;
ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_ODCNTL);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading reg_odcntl\n");
return ret;
}
data->odr_bits = ret;
/*
* set output data rate for wake up (motion detection) function
* to match data rate for accelerometer sampling
*/
ret = kmx61_get_odr(data, &val, &val2, KMX61_ACC);
if (ret < 0)
return ret;
ret = kmx61_set_wake_up_odr(data, val, val2);
if (ret < 0)
return ret;
/* set acc/magn to OPERATION mode */
ret = kmx61_set_mode(data, 0, KMX61_ACC | KMX61_MAG, true);
if (ret < 0)
return ret;
data->wake_thresh = KMX61_DEFAULT_WAKE_THRESH;
data->wake_duration = KMX61_DEFAULT_WAKE_DURATION;
return 0;
}
static int kmx61_setup_new_data_interrupt(struct kmx61_data *data,
bool status, u8 device)
{
u8 mode;
int ret;
ret = kmx61_get_mode(data, &mode, KMX61_ACC | KMX61_MAG);
if (ret < 0)
return ret;
ret = kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, true);
if (ret < 0)
return ret;
ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_INC1);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
return ret;
}
if (status) {
ret |= KMX61_REG_INC1_BIT_IEN;
if (device & KMX61_ACC)
ret |= KMX61_REG_INC1_BIT_DRDYA;
if (device & KMX61_MAG)
ret |= KMX61_REG_INC1_BIT_DRDYM;
} else {
ret &= ~KMX61_REG_INC1_BIT_IEN;
if (device & KMX61_ACC)
ret &= ~KMX61_REG_INC1_BIT_DRDYA;
if (device & KMX61_MAG)
ret &= ~KMX61_REG_INC1_BIT_DRDYM;
}
ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_INC1, ret);
if (ret < 0) {
dev_err(&data->client->dev, "Error writing reg_int_ctrl1\n");
return ret;
}
ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_CTRL1);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
return ret;
}
if (status)
ret |= KMX61_REG_CTRL1_BIT_DRDYE;
else
ret &= ~KMX61_REG_CTRL1_BIT_DRDYE;
ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_CTRL1, ret);
if (ret < 0) {
dev_err(&data->client->dev, "Error writing reg_ctrl1\n");
return ret;
}
return kmx61_set_mode(data, mode, KMX61_ACC | KMX61_MAG, true);
}
static int kmx61_chip_update_thresholds(struct kmx61_data *data)
{
int ret;
ret = i2c_smbus_write_byte_data(data->client,
KMX61_REG_WUF_TIMER,
data->wake_duration);
if (ret < 0) {
dev_err(&data->client->dev, "Errow writing reg_wuf_timer\n");
return ret;
}
ret = i2c_smbus_write_byte_data(data->client,
KMX61_REG_WUF_THRESH,
data->wake_thresh);
if (ret < 0)
dev_err(&data->client->dev, "Error writing reg_wuf_thresh\n");
return ret;
}
static int kmx61_setup_any_motion_interrupt(struct kmx61_data *data,
bool status)
{
u8 mode;
int ret;
ret = kmx61_get_mode(data, &mode, KMX61_ACC | KMX61_MAG);
if (ret < 0)
return ret;
ret = kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, true);
if (ret < 0)
return ret;
ret = kmx61_chip_update_thresholds(data);
if (ret < 0)
return ret;
ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_INC1);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading reg_inc1\n");
return ret;
}
if (status)
ret |= (KMX61_REG_INC1_BIT_IEN | KMX61_REG_INC1_BIT_WUFS);
else
ret &= ~(KMX61_REG_INC1_BIT_IEN | KMX61_REG_INC1_BIT_WUFS);
ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_INC1, ret);
if (ret < 0) {
dev_err(&data->client->dev, "Error writing reg_inc1\n");
return ret;
}
ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_CTRL1);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
return ret;
}
if (status)
ret |= KMX61_REG_CTRL1_BIT_WUFE | KMX61_REG_CTRL1_BIT_BTSE;
else
ret &= ~(KMX61_REG_CTRL1_BIT_WUFE | KMX61_REG_CTRL1_BIT_BTSE);
ret = i2c_smbus_write_byte_data(data->client, KMX61_REG_CTRL1, ret);
if (ret < 0) {
dev_err(&data->client->dev, "Error writing reg_ctrl1\n");
return ret;
}
mode |= KMX61_ACT_STBY_BIT;
return kmx61_set_mode(data, mode, KMX61_ACC | KMX61_MAG, true);
}
/**
* kmx61_set_power_state() - set power state for kmx61 @device
* @data: kmx61 device private pointer
* @on: power state to be set for @device
* @device: bitmask indicating device for which @on state needs to be set
*
* Notice that when ACC power state needs to be set to ON and MAG is in
* OPERATION then we know that kmx61_runtime_resume was already called
* so we must set ACC OPERATION mode here. The same happens when MAG power
* state needs to be set to ON and ACC is in OPERATION.
*/
static int kmx61_set_power_state(struct kmx61_data *data, bool on, u8 device)
{
#ifdef CONFIG_PM
int ret;
if (device & KMX61_ACC) {
if (on && !data->acc_ps && !data->mag_stby) {
ret = kmx61_set_mode(data, 0, KMX61_ACC, true);
if (ret < 0)
return ret;
}
data->acc_ps = on;
}
if (device & KMX61_MAG) {
if (on && !data->mag_ps && !data->acc_stby) {
ret = kmx61_set_mode(data, 0, KMX61_MAG, true);
if (ret < 0)
return ret;
}
data->mag_ps = on;
}
if (on) {
ret = pm_runtime_get_sync(&data->client->dev);
} else {
pm_runtime_mark_last_busy(&data->client->dev);
ret = pm_runtime_put_autosuspend(&data->client->dev);
}
if (ret < 0) {
dev_err(&data->client->dev,
"Failed: kmx61_set_power_state for %d, ret %d\n",
on, ret);
if (on)
pm_runtime_put_noidle(&data->client->dev);
return ret;
}
#endif
return 0;
}
static int kmx61_read_measurement(struct kmx61_data *data, u8 base, u8 offset)
{
int ret;
u8 reg = base + offset * 2;
ret = i2c_smbus_read_word_data(data->client, reg);
if (ret < 0)
dev_err(&data->client->dev, "failed to read reg at %x\n", reg);
return ret;
}
static int kmx61_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val,
int *val2, long mask)
{
int ret;
u8 base_reg;
struct kmx61_data *data = kmx61_get_data(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_RAW:
switch (chan->type) {
case IIO_ACCEL:
base_reg = KMX61_ACC_XOUT_L;
break;
case IIO_MAGN:
base_reg = KMX61_MAG_XOUT_L;
break;
default:
return -EINVAL;
}
mutex_lock(&data->lock);
ret = kmx61_set_power_state(data, true, chan->address);
if (ret) {
mutex_unlock(&data->lock);
return ret;
}
ret = kmx61_read_measurement(data, base_reg, chan->scan_index);
if (ret < 0) {
kmx61_set_power_state(data, false, chan->address);
mutex_unlock(&data->lock);
return ret;
}
*val = sign_extend32(ret >> chan->scan_type.shift,
chan->scan_type.realbits - 1);
ret = kmx61_set_power_state(data, false, chan->address);
mutex_unlock(&data->lock);
if (ret)
return ret;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_ACCEL:
*val = 0;
*val2 = kmx61_uscale_table[data->range];
return IIO_VAL_INT_PLUS_MICRO;
case IIO_MAGN:
/* 14 bits res, 1465 microGauss per magn count */
*val = 0;
*val2 = 1465;
return IIO_VAL_INT_PLUS_MICRO;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_SAMP_FREQ:
if (chan->type != IIO_ACCEL && chan->type != IIO_MAGN)
return -EINVAL;
mutex_lock(&data->lock);
ret = kmx61_get_odr(data, val, val2, chan->address);
mutex_unlock(&data->lock);
if (ret)
return -EINVAL;
return IIO_VAL_INT_PLUS_MICRO;
}
return -EINVAL;
}
static int kmx61_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int val,
int val2, long mask)
{
int ret;
struct kmx61_data *data = kmx61_get_data(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
if (chan->type != IIO_ACCEL && chan->type != IIO_MAGN)
return -EINVAL;
mutex_lock(&data->lock);
ret = kmx61_set_odr(data, val, val2, chan->address);
mutex_unlock(&data->lock);
return ret;
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_ACCEL:
if (val != 0)
return -EINVAL;
mutex_lock(&data->lock);
ret = kmx61_set_scale(data, val2);
mutex_unlock(&data->lock);
return ret;
default:
return -EINVAL;
}
default:
return -EINVAL;
}
}
static int kmx61_read_event(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 kmx61_data *data = kmx61_get_data(indio_dev);
*val2 = 0;
switch (info) {
case IIO_EV_INFO_VALUE:
*val = data->wake_thresh;
return IIO_VAL_INT;
case IIO_EV_INFO_PERIOD:
*val = data->wake_duration;
return IIO_VAL_INT;
default:
return -EINVAL;
}
}
static int kmx61_write_event(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 kmx61_data *data = kmx61_get_data(indio_dev);
if (data->ev_enable_state)
return -EBUSY;
switch (info) {
case IIO_EV_INFO_VALUE:
data->wake_thresh = val;
return IIO_VAL_INT;
case IIO_EV_INFO_PERIOD:
data->wake_duration = val;
return IIO_VAL_INT;
default:
return -EINVAL;
}
}
static int kmx61_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 kmx61_data *data = kmx61_get_data(indio_dev);
return data->ev_enable_state;
}
static int kmx61_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 kmx61_data *data = kmx61_get_data(indio_dev);
int ret = 0;
if (state && data->ev_enable_state)
return 0;
mutex_lock(&data->lock);
if (!state && data->motion_trig_on) {
data->ev_enable_state = false;
goto err_unlock;
}
ret = kmx61_set_power_state(data, state, KMX61_ACC);
if (ret < 0)
goto err_unlock;
ret = kmx61_setup_any_motion_interrupt(data, state);
if (ret < 0) {
kmx61_set_power_state(data, false, KMX61_ACC);
goto err_unlock;
}
data->ev_enable_state = state;
err_unlock:
mutex_unlock(&data->lock);
return ret;
}
static int kmx61_acc_validate_trigger(struct iio_dev *indio_dev,
struct iio_trigger *trig)
{
struct kmx61_data *data = kmx61_get_data(indio_dev);
if (data->acc_dready_trig != trig && data->motion_trig != trig)
return -EINVAL;
return 0;
}
static int kmx61_mag_validate_trigger(struct iio_dev *indio_dev,
struct iio_trigger *trig)
{
struct kmx61_data *data = kmx61_get_data(indio_dev);
if (data->mag_dready_trig != trig)
return -EINVAL;
return 0;
}
static const struct iio_info kmx61_acc_info = {
.read_raw = kmx61_read_raw,
.write_raw = kmx61_write_raw,
.attrs = &kmx61_acc_attribute_group,
.read_event_value = kmx61_read_event,
.write_event_value = kmx61_write_event,
.read_event_config = kmx61_read_event_config,
.write_event_config = kmx61_write_event_config,
.validate_trigger = kmx61_acc_validate_trigger,
};
static const struct iio_info kmx61_mag_info = {
.read_raw = kmx61_read_raw,
.write_raw = kmx61_write_raw,
.attrs = &kmx61_mag_attribute_group,
.validate_trigger = kmx61_mag_validate_trigger,
};
static int kmx61_data_rdy_trigger_set_state(struct iio_trigger *trig,
bool state)
{
int ret = 0;
u8 device;
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
struct kmx61_data *data = kmx61_get_data(indio_dev);
mutex_lock(&data->lock);
if (!state && data->ev_enable_state && data->motion_trig_on) {
data->motion_trig_on = false;
goto err_unlock;
}
if (data->acc_dready_trig == trig || data->motion_trig == trig)
device = KMX61_ACC;
else
device = KMX61_MAG;
ret = kmx61_set_power_state(data, state, device);
if (ret < 0)
goto err_unlock;
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);
if (ret < 0) {
kmx61_set_power_state(data, false, device);
goto err_unlock;
}
if (data->acc_dready_trig == trig)
data->acc_dready_trig_on = state;
else if (data->mag_dready_trig == trig)
data->mag_dready_trig_on = state;
else
data->motion_trig_on = state;
err_unlock:
mutex_unlock(&data->lock);
return ret;
}
static void kmx61_trig_reenable(struct iio_trigger *trig)
{
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
struct kmx61_data *data = kmx61_get_data(indio_dev);
int ret;
ret = i2c_smbus_read_byte_data(data->client, KMX61_REG_INL);
if (ret < 0)
dev_err(&data->client->dev, "Error reading reg_inl\n");
}
static const struct iio_trigger_ops kmx61_trigger_ops = {
.set_trigger_state = kmx61_data_rdy_trigger_set_state,
.reenable = kmx61_trig_reenable,
};
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 writing 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");
return IRQ_HANDLED;
}
static irqreturn_t kmx61_data_rdy_trig_poll(int irq, void *private)
{
struct kmx61_data *data = private;
if (data->acc_dready_trig_on)
iio_trigger_poll(data->acc_dready_trig);
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;
}
static irqreturn_t kmx61_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct kmx61_data *data = kmx61_get_data(indio_dev);
int bit, ret, i = 0;
u8 base;
s16 buffer[8];
if (indio_dev == data->acc_indio_dev)
base = KMX61_ACC_XOUT_L;
else
base = KMX61_MAG_XOUT_L;
mutex_lock(&data->lock);
for_each_set_bit(bit, indio_dev->active_scan_mask,
indio_dev->masklength) {
ret = kmx61_read_measurement(data, base, bit);
if (ret < 0) {
mutex_unlock(&data->lock);
goto err;
}
buffer[i++] = ret;
}
mutex_unlock(&data->lock);
iio_push_to_buffers(indio_dev, buffer);
err:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static const char *kmx61_match_acpi_device(struct device *dev)
{
const struct acpi_device_id *id;
id = acpi_match_device(dev->driver->acpi_match_table, dev);
if (!id)
return NULL;
return dev_name(dev);
}
static struct iio_dev *kmx61_indiodev_setup(struct kmx61_data *data,
const struct iio_info *info,
const struct iio_chan_spec *chan,
int num_channels,
const char *name)
{
struct iio_dev *indio_dev;
indio_dev = devm_iio_device_alloc(&data->client->dev, sizeof(data));
if (!indio_dev)
return ERR_PTR(-ENOMEM);
kmx61_set_data(indio_dev, data);
indio_dev->channels = chan;
indio_dev->num_channels = num_channels;
indio_dev->name = name;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = info;
return indio_dev;
}
static struct iio_trigger *kmx61_trigger_setup(struct kmx61_data *data,
struct iio_dev *indio_dev,
const char *tag)
{
struct iio_trigger *trig;
int ret;
trig = devm_iio_trigger_alloc(&data->client->dev,
"%s-%s-dev%d",
indio_dev->name,
tag,
indio_dev->id);
if (!trig)
return ERR_PTR(-ENOMEM);
trig->dev.parent = &data->client->dev;
trig->ops = &kmx61_trigger_ops;
iio_trigger_set_drvdata(trig, indio_dev);
ret = iio_trigger_register(trig);
if (ret)
return ERR_PTR(ret);
return trig;
}
static int kmx61_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret;
struct kmx61_data *data;
const char *name = NULL;
data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL);
if (!data)
return -ENOMEM;
i2c_set_clientdata(client, data);
data->client = client;
mutex_init(&data->lock);
if (id)
name = id->name;
else if (ACPI_HANDLE(&client->dev))
name = kmx61_match_acpi_device(&client->dev);
else
return -ENODEV;
data->acc_indio_dev =
kmx61_indiodev_setup(data, &kmx61_acc_info,
kmx61_acc_channels,
ARRAY_SIZE(kmx61_acc_channels),
name);
if (IS_ERR(data->acc_indio_dev))
return PTR_ERR(data->acc_indio_dev);
data->mag_indio_dev =
kmx61_indiodev_setup(data, &kmx61_mag_info,
kmx61_mag_channels,
ARRAY_SIZE(kmx61_mag_channels),
name);
if (IS_ERR(data->mag_indio_dev))
return PTR_ERR(data->mag_indio_dev);
ret = kmx61_chip_init(data);
if (ret < 0)
return ret;
if (client->irq > 0) {
ret = devm_request_threaded_irq(&client->dev, client->irq,
kmx61_data_rdy_trig_poll,
kmx61_event_handler,
IRQF_TRIGGER_RISING,
KMX61_IRQ_NAME,
data);
if (ret)
goto err_chip_uninit;
data->acc_dready_trig =
kmx61_trigger_setup(data, data->acc_indio_dev,
"dready");
if (IS_ERR(data->acc_dready_trig)) {
ret = PTR_ERR(data->acc_dready_trig);
goto err_chip_uninit;
}
data->mag_dready_trig =
kmx61_trigger_setup(data, data->mag_indio_dev,
"dready");
if (IS_ERR(data->mag_dready_trig)) {
ret = PTR_ERR(data->mag_dready_trig);
goto err_trigger_unregister_acc_dready;
}
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_mag_dready;
}
ret = iio_triggered_buffer_setup(data->acc_indio_dev,
&iio_pollfunc_store_time,
kmx61_trigger_handler,
NULL);
if (ret < 0) {
dev_err(&data->client->dev,
"Failed to setup acc triggered buffer\n");
goto err_trigger_unregister_motion;
}
ret = iio_triggered_buffer_setup(data->mag_indio_dev,
&iio_pollfunc_store_time,
kmx61_trigger_handler,
NULL);
if (ret < 0) {
dev_err(&data->client->dev,
"Failed to setup mag triggered buffer\n");
goto err_buffer_cleanup_acc;
}
}
ret = pm_runtime_set_active(&client->dev);
if (ret < 0)
goto err_buffer_cleanup_mag;
pm_runtime_enable(&client->dev);
pm_runtime_set_autosuspend_delay(&client->dev, KMX61_SLEEP_DELAY_MS);
pm_runtime_use_autosuspend(&client->dev);
ret = iio_device_register(data->acc_indio_dev);
if (ret < 0) {
dev_err(&client->dev, "Failed to register acc iio device\n");
goto err_buffer_cleanup_mag;
}
ret = iio_device_register(data->mag_indio_dev);
if (ret < 0) {
dev_err(&client->dev, "Failed to register mag iio device\n");
goto err_iio_unregister_acc;
}
return 0;
err_iio_unregister_acc:
iio_device_unregister(data->acc_indio_dev);
err_buffer_cleanup_mag:
if (client->irq > 0)
iio_triggered_buffer_cleanup(data->mag_indio_dev);
err_buffer_cleanup_acc:
if (client->irq > 0)
iio_triggered_buffer_cleanup(data->acc_indio_dev);
err_trigger_unregister_motion:
iio_trigger_unregister(data->motion_trig);
err_trigger_unregister_mag_dready:
iio_trigger_unregister(data->mag_dready_trig);
err_trigger_unregister_acc_dready:
iio_trigger_unregister(data->acc_dready_trig);
err_chip_uninit:
kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, true);
return ret;
}
static int kmx61_remove(struct i2c_client *client)
{
struct kmx61_data *data = i2c_get_clientdata(client);
iio_device_unregister(data->acc_indio_dev);
iio_device_unregister(data->mag_indio_dev);
pm_runtime_disable(&client->dev);
pm_runtime_set_suspended(&client->dev);
pm_runtime_put_noidle(&client->dev);
if (client->irq > 0) {
iio_triggered_buffer_cleanup(data->acc_indio_dev);
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);
kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, true);
mutex_unlock(&data->lock);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int kmx61_suspend(struct device *dev)
{
int ret;
struct kmx61_data *data = i2c_get_clientdata(to_i2c_client(dev));
mutex_lock(&data->lock);
ret = kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG,
false);
mutex_unlock(&data->lock);
return ret;
}
static int kmx61_resume(struct device *dev)
{
u8 stby = 0;
struct kmx61_data *data = i2c_get_clientdata(to_i2c_client(dev));
if (data->acc_stby)
stby |= KMX61_ACC_STBY_BIT;
if (data->mag_stby)
stby |= KMX61_MAG_STBY_BIT;
return kmx61_set_mode(data, stby, KMX61_ACC | KMX61_MAG, true);
}
#endif
#ifdef CONFIG_PM
static int kmx61_runtime_suspend(struct device *dev)
{
struct kmx61_data *data = i2c_get_clientdata(to_i2c_client(dev));
int ret;
mutex_lock(&data->lock);
ret = kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, true);
mutex_unlock(&data->lock);
return ret;
}
static int kmx61_runtime_resume(struct device *dev)
{
struct kmx61_data *data = i2c_get_clientdata(to_i2c_client(dev));
u8 stby = 0;
if (!data->acc_ps)
stby |= KMX61_ACC_STBY_BIT;
if (!data->mag_ps)
stby |= KMX61_MAG_STBY_BIT;
return kmx61_set_mode(data, stby, KMX61_ACC | KMX61_MAG, true);
}
#endif
static const struct dev_pm_ops kmx61_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(kmx61_suspend, kmx61_resume)
SET_RUNTIME_PM_OPS(kmx61_runtime_suspend, kmx61_runtime_resume, NULL)
};
static const struct acpi_device_id kmx61_acpi_match[] = {
{"KMX61021", 0},
{}
};
MODULE_DEVICE_TABLE(acpi, kmx61_acpi_match);
static const struct i2c_device_id kmx61_id[] = {
{"kmx611021", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, kmx61_id);
static struct i2c_driver kmx61_driver = {
.driver = {
.name = KMX61_DRV_NAME,
.acpi_match_table = ACPI_PTR(kmx61_acpi_match),
.pm = &kmx61_pm_ops,
},
.probe = kmx61_probe,
.remove = kmx61_remove,
.id_table = kmx61_id,
};
module_i2c_driver(kmx61_driver);
MODULE_AUTHOR("Daniel Baluta <daniel.baluta@intel.com>");
MODULE_DESCRIPTION("KMX61 accelerometer/magnetometer driver");
MODULE_LICENSE("GPL v2");
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