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linux/drivers/iio/accel/kxcjk-1013.c

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/*
* KXCJK-1013 3-axis accelerometer driver
* Copyright (c) 2014, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*/
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/bitops.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/acpi.h>
#include <linux/gpio/consumer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/accel/kxcjk_1013.h>
#define KXCJK1013_DRV_NAME "kxcjk1013"
#define KXCJK1013_IRQ_NAME "kxcjk1013_event"
#define KXCJK1013_REG_XOUT_L 0x06
/*
* From low byte X axis register, all the other addresses of Y and Z can be
* obtained by just applying axis offset. The following axis defines are just
* provide clarity, but not used.
*/
#define KXCJK1013_REG_XOUT_H 0x07
#define KXCJK1013_REG_YOUT_L 0x08
#define KXCJK1013_REG_YOUT_H 0x09
#define KXCJK1013_REG_ZOUT_L 0x0A
#define KXCJK1013_REG_ZOUT_H 0x0B
#define KXCJK1013_REG_DCST_RESP 0x0C
#define KXCJK1013_REG_WHO_AM_I 0x0F
#define KXCJK1013_REG_INT_SRC1 0x16
#define KXCJK1013_REG_INT_SRC2 0x17
#define KXCJK1013_REG_STATUS_REG 0x18
#define KXCJK1013_REG_INT_REL 0x1A
#define KXCJK1013_REG_CTRL1 0x1B
#define KXCJK1013_REG_CTRL2 0x1D
#define KXCJK1013_REG_INT_CTRL1 0x1E
#define KXCJK1013_REG_INT_CTRL2 0x1F
#define KXCJK1013_REG_DATA_CTRL 0x21
#define KXCJK1013_REG_WAKE_TIMER 0x29
#define KXCJK1013_REG_SELF_TEST 0x3A
#define KXCJK1013_REG_WAKE_THRES 0x6A
#define KXCJK1013_REG_CTRL1_BIT_PC1 BIT(7)
#define KXCJK1013_REG_CTRL1_BIT_RES BIT(6)
#define KXCJK1013_REG_CTRL1_BIT_DRDY BIT(5)
#define KXCJK1013_REG_CTRL1_BIT_GSEL1 BIT(4)
#define KXCJK1013_REG_CTRL1_BIT_GSEL0 BIT(3)
#define KXCJK1013_REG_CTRL1_BIT_WUFE BIT(1)
#define KXCJK1013_REG_INT_REG1_BIT_IEA BIT(4)
#define KXCJK1013_REG_INT_REG1_BIT_IEN BIT(5)
#define KXCJK1013_DATA_MASK_12_BIT 0x0FFF
#define KXCJK1013_MAX_STARTUP_TIME_US 100000
struct kxcjk1013_data {
struct i2c_client *client;
struct iio_trigger *trig;
bool trig_mode;
struct mutex mutex;
s16 buffer[8];
int power_state;
u8 odr_bits;
bool active_high_intr;
};
enum kxcjk1013_axis {
AXIS_X,
AXIS_Y,
AXIS_Z,
};
enum kxcjk1013_mode {
STANDBY,
OPERATION,
};
static const struct {
int val;
int val2;
int odr_bits;
} samp_freq_table[] = { {0, 781000, 0x08}, {1, 563000, 0x09},
{3, 125000, 0x0A}, {6, 250000, 0x0B}, {12, 500000, 0},
{25, 0, 0x01}, {50, 0, 0x02}, {100, 0, 0x03},
{200, 0, 0x04}, {400, 0, 0x05}, {800, 0, 0x06},
{1600, 0, 0x07} };
/* Refer to section 4 of the specification */
static const struct {
int odr_bits;
int usec;
} odr_start_up_times[] = { {0x08, 100000}, {0x09, 100000}, {0x0A, 100000},
{0x0B, 100000}, { 0, 80000}, {0x01, 41000},
{0x02, 21000}, {0x03, 11000}, {0x04, 6400},
{0x05, 3900}, {0x06, 2700}, {0x07, 2100} };
static int kxcjk1013_set_mode(struct kxcjk1013_data *data,
enum kxcjk1013_mode mode)
{
int ret;
ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_CTRL1);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
return ret;
}
if (mode == STANDBY)
ret &= ~KXCJK1013_REG_CTRL1_BIT_PC1;
else
ret |= KXCJK1013_REG_CTRL1_BIT_PC1;
ret = i2c_smbus_write_byte_data(data->client,
KXCJK1013_REG_CTRL1, ret);
if (ret < 0) {
dev_err(&data->client->dev, "Error writing reg_ctrl1\n");
return ret;
}
return 0;
}
static int kxcjk1013_chip_init(struct kxcjk1013_data *data)
{
int ret;
ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_WHO_AM_I);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading who_am_i\n");
return ret;
}
dev_dbg(&data->client->dev, "KXCJK1013 Chip Id %x\n", ret);
ret = kxcjk1013_set_mode(data, STANDBY);
if (ret < 0)
return ret;
ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_CTRL1);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
return ret;
}
/* Setting range to 4G */
ret |= KXCJK1013_REG_CTRL1_BIT_GSEL0;
ret &= ~KXCJK1013_REG_CTRL1_BIT_GSEL1;
/* Set 12 bit mode */
ret |= KXCJK1013_REG_CTRL1_BIT_RES;
ret = i2c_smbus_write_byte_data(data->client, KXCJK1013_REG_CTRL1,
ret);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading reg_ctrl\n");
return ret;
}
ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_DATA_CTRL);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading reg_data_ctrl\n");
return ret;
}
data->odr_bits = ret;
/* Set up INT polarity */
ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_INT_CTRL1);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading reg_int_ctrl1\n");
return ret;
}
if (data->active_high_intr)
ret |= KXCJK1013_REG_INT_REG1_BIT_IEA;
else
ret &= ~KXCJK1013_REG_INT_REG1_BIT_IEA;
ret = i2c_smbus_write_byte_data(data->client, KXCJK1013_REG_INT_CTRL1,
ret);
if (ret < 0) {
dev_err(&data->client->dev, "Error writing reg_int_ctrl1\n");
return ret;
}
return 0;
}
static int kxcjk1013_chip_setup_interrupt(struct kxcjk1013_data *data,
bool status)
{
int ret;
/* This is requirement by spec to change state to STANDBY */
ret = kxcjk1013_set_mode(data, STANDBY);
if (ret < 0)
return ret;
ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_INT_CTRL1);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading reg_int_ctrl1\n");
return ret;
}
if (status)
ret |= KXCJK1013_REG_INT_REG1_BIT_IEN;
else
ret &= ~KXCJK1013_REG_INT_REG1_BIT_IEN;
ret = i2c_smbus_write_byte_data(data->client, KXCJK1013_REG_INT_CTRL1,
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, KXCJK1013_REG_CTRL1);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading reg_ctrl1\n");
return ret;
}
if (status)
ret |= KXCJK1013_REG_CTRL1_BIT_DRDY;
else
ret &= ~KXCJK1013_REG_CTRL1_BIT_DRDY;
ret = i2c_smbus_write_byte_data(data->client,
KXCJK1013_REG_CTRL1, ret);
if (ret < 0) {
dev_err(&data->client->dev, "Error writing reg_ctrl1\n");
return ret;
}
return ret;
}
static int kxcjk1013_convert_freq_to_bit(int val, int val2)
{
int i;
for (i = 0; i < ARRAY_SIZE(samp_freq_table); ++i) {
if (samp_freq_table[i].val == val &&
samp_freq_table[i].val2 == val2) {
return samp_freq_table[i].odr_bits;
}
}
return -EINVAL;
}
static int kxcjk1013_set_odr(struct kxcjk1013_data *data, int val, int val2)
{
int ret;
int odr_bits;
odr_bits = kxcjk1013_convert_freq_to_bit(val, val2);
if (odr_bits < 0)
return odr_bits;
/* To change ODR, the chip must be set to STANDBY as per spec */
ret = kxcjk1013_set_mode(data, STANDBY);
if (ret < 0)
return ret;
ret = i2c_smbus_write_byte_data(data->client, KXCJK1013_REG_DATA_CTRL,
odr_bits);
if (ret < 0) {
dev_err(&data->client->dev, "Error writing data_ctrl\n");
return ret;
}
data->odr_bits = odr_bits;
/* Check, if the ODR is changed after data enable */
if (data->power_state) {
/* Set the state back to operation */
ret = kxcjk1013_set_mode(data, OPERATION);
if (ret < 0)
return ret;
}
return 0;
}
static int kxcjk1013_get_odr(struct kxcjk1013_data *data, int *val, int *val2)
{
int i;
for (i = 0; i < ARRAY_SIZE(samp_freq_table); ++i) {
if (samp_freq_table[i].odr_bits == data->odr_bits) {
*val = samp_freq_table[i].val;
*val2 = samp_freq_table[i].val2;
return IIO_VAL_INT_PLUS_MICRO;
}
}
return -EINVAL;
}
static int kxcjk1013_get_acc_reg(struct kxcjk1013_data *data, int axis)
{
u8 reg = KXCJK1013_REG_XOUT_L + axis * 2;
int ret;
ret = i2c_smbus_read_word_data(data->client, reg);
if (ret < 0) {
dev_err(&data->client->dev,
"failed to read accel_%c registers\n", 'x' + axis);
return ret;
}
return ret;
}
static int kxcjk1013_get_startup_times(struct kxcjk1013_data *data)
{
int i;
for (i = 0; i < ARRAY_SIZE(odr_start_up_times); ++i) {
if (odr_start_up_times[i].odr_bits == data->odr_bits)
return odr_start_up_times[i].usec;
}
return KXCJK1013_MAX_STARTUP_TIME_US;
}
static int kxcjk1013_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val,
int *val2, long mask)
{
struct kxcjk1013_data *data = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
mutex_lock(&data->mutex);
if (iio_buffer_enabled(indio_dev))
ret = -EBUSY;
else {
int sleep_val;
ret = kxcjk1013_set_mode(data, OPERATION);
if (ret < 0) {
mutex_unlock(&data->mutex);
return ret;
}
++data->power_state;
sleep_val = kxcjk1013_get_startup_times(data);
if (sleep_val < 20000)
usleep_range(sleep_val, 20000);
else
msleep_interruptible(sleep_val/1000);
ret = kxcjk1013_get_acc_reg(data, chan->scan_index);
if (--data->power_state == 0)
kxcjk1013_set_mode(data, STANDBY);
}
mutex_unlock(&data->mutex);
if (ret < 0)
return ret;
*val = sign_extend32(ret >> 4, 11);
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = 0;
*val2 = 19163; /* range +-4g (4/2047*9.806650) */
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_SAMP_FREQ:
mutex_lock(&data->mutex);
ret = kxcjk1013_get_odr(data, val, val2);
mutex_unlock(&data->mutex);
return ret;
default:
return -EINVAL;
}
}
static int kxcjk1013_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int val,
int val2, long mask)
{
struct kxcjk1013_data *data = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_SAMP_FREQ:
mutex_lock(&data->mutex);
ret = kxcjk1013_set_odr(data, val, val2);
mutex_unlock(&data->mutex);
break;
default:
ret = -EINVAL;
}
return ret;
}
static int kxcjk1013_validate_trigger(struct iio_dev *indio_dev,
struct iio_trigger *trig)
{
struct kxcjk1013_data *data = iio_priv(indio_dev);
if (data->trig != trig)
return -EINVAL;
return 0;
}
static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
"0.781000 1.563000 3.125000 6.250000 12.500000 25 50 100 200 400 800 1600");
static struct attribute *kxcjk1013_attributes[] = {
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
NULL,
};
static const struct attribute_group kxcjk1013_attrs_group = {
.attrs = kxcjk1013_attributes,
};
#define KXCJK1013_CHANNEL(_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), \
.scan_index = AXIS_##_axis, \
.scan_type = { \
.sign = 's', \
.realbits = 12, \
.storagebits = 16, \
.shift = 4, \
.endianness = IIO_LE, \
}, \
}
static const struct iio_chan_spec kxcjk1013_channels[] = {
KXCJK1013_CHANNEL(X),
KXCJK1013_CHANNEL(Y),
KXCJK1013_CHANNEL(Z),
IIO_CHAN_SOFT_TIMESTAMP(3),
};
static const struct iio_info kxcjk1013_info = {
.attrs = &kxcjk1013_attrs_group,
.read_raw = kxcjk1013_read_raw,
.write_raw = kxcjk1013_write_raw,
.validate_trigger = kxcjk1013_validate_trigger,
.driver_module = THIS_MODULE,
};
static irqreturn_t kxcjk1013_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct kxcjk1013_data *data = iio_priv(indio_dev);
int bit, ret, i = 0;
mutex_lock(&data->mutex);
for_each_set_bit(bit, indio_dev->buffer->scan_mask,
indio_dev->masklength) {
ret = kxcjk1013_get_acc_reg(data, bit);
if (ret < 0) {
mutex_unlock(&data->mutex);
goto err;
}
data->buffer[i++] = ret;
}
mutex_unlock(&data->mutex);
iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
pf->timestamp);
err:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static int kxcjk1013_trig_try_reen(struct iio_trigger *trig)
{
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
struct kxcjk1013_data *data = iio_priv(indio_dev);
int ret;
ret = i2c_smbus_read_byte_data(data->client, KXCJK1013_REG_INT_REL);
if (ret < 0) {
dev_err(&data->client->dev, "Error reading reg_int_rel\n");
return ret;
}
return 0;
}
static int kxcjk1013_data_rdy_trigger_set_state(struct iio_trigger *trig,
bool state)
{
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
struct kxcjk1013_data *data = iio_priv(indio_dev);
mutex_lock(&data->mutex);
if (state) {
kxcjk1013_chip_setup_interrupt(data, true);
kxcjk1013_set_mode(data, OPERATION);
++data->power_state;
} else {
if (--data->power_state) {
mutex_unlock(&data->mutex);
return 0;
}
kxcjk1013_chip_setup_interrupt(data, false);
kxcjk1013_set_mode(data, STANDBY);
}
mutex_unlock(&data->mutex);
return 0;
}
static const struct iio_trigger_ops kxcjk1013_trigger_ops = {
.set_trigger_state = kxcjk1013_data_rdy_trigger_set_state,
.try_reenable = kxcjk1013_trig_try_reen,
.owner = THIS_MODULE,
};
static int kxcjk1013_acpi_gpio_probe(struct i2c_client *client,
struct kxcjk1013_data *data)
{
const struct acpi_device_id *id;
struct device *dev;
struct gpio_desc *gpio;
int ret;
if (!client)
return -EINVAL;
dev = &client->dev;
if (!ACPI_HANDLE(dev))
return -ENODEV;
id = acpi_match_device(dev->driver->acpi_match_table, dev);
if (!id)
return -ENODEV;
/* data ready gpio interrupt pin */
gpio = devm_gpiod_get_index(dev, "kxcjk1013_int", 0);
if (IS_ERR(gpio)) {
dev_err(dev, "acpi gpio get index failed\n");
return PTR_ERR(gpio);
}
ret = gpiod_direction_input(gpio);
if (ret)
return ret;
ret = gpiod_to_irq(gpio);
dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
return ret;
}
static int kxcjk1013_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct kxcjk1013_data *data;
struct iio_dev *indio_dev;
struct iio_trigger *trig = NULL;
struct kxcjk_1013_platform_data *pdata;
int ret;
indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
if (!indio_dev)
return -ENOMEM;
data = iio_priv(indio_dev);
i2c_set_clientdata(client, indio_dev);
data->client = client;
pdata = dev_get_platdata(&client->dev);
if (pdata)
data->active_high_intr = pdata->active_high_intr;
else
data->active_high_intr = true; /* default polarity */
ret = kxcjk1013_chip_init(data);
if (ret < 0)
return ret;
mutex_init(&data->mutex);
indio_dev->dev.parent = &client->dev;
indio_dev->channels = kxcjk1013_channels;
indio_dev->num_channels = ARRAY_SIZE(kxcjk1013_channels);
indio_dev->name = KXCJK1013_DRV_NAME;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &kxcjk1013_info;
if (client->irq < 0)
client->irq = kxcjk1013_acpi_gpio_probe(client, data);
if (client->irq >= 0) {
trig = iio_trigger_alloc("%s-dev%d", indio_dev->name,
indio_dev->id);
if (!trig)
return -ENOMEM;
data->trig_mode = true;
ret = devm_request_irq(&client->dev, client->irq,
iio_trigger_generic_data_rdy_poll,
IRQF_TRIGGER_RISING,
KXCJK1013_IRQ_NAME,
trig);
if (ret) {
dev_err(&client->dev, "unable to request IRQ\n");
goto err_trigger_free;
}
trig->dev.parent = &client->dev;
trig->ops = &kxcjk1013_trigger_ops;
iio_trigger_set_drvdata(trig, indio_dev);
data->trig = trig;
indio_dev->trig = trig;
iio_trigger_get(indio_dev->trig);
ret = iio_trigger_register(trig);
if (ret)
goto err_trigger_free;
ret = iio_triggered_buffer_setup(indio_dev,
&iio_pollfunc_store_time,
kxcjk1013_trigger_handler,
NULL);
if (ret < 0) {
dev_err(&client->dev,
"iio triggered buffer setup failed\n");
goto err_trigger_unregister;
}
}
ret = devm_iio_device_register(&client->dev, indio_dev);
if (ret < 0) {
dev_err(&client->dev, "unable to register iio device\n");
goto err_buffer_cleanup;
}
return 0;
err_buffer_cleanup:
if (data->trig_mode)
iio_triggered_buffer_cleanup(indio_dev);
err_trigger_unregister:
if (data->trig_mode)
iio_trigger_unregister(trig);
err_trigger_free:
if (data->trig_mode)
iio_trigger_free(trig);
return ret;
}
static int kxcjk1013_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct kxcjk1013_data *data = iio_priv(indio_dev);
if (data->trig_mode) {
iio_triggered_buffer_cleanup(indio_dev);
iio_trigger_unregister(data->trig);
iio_trigger_free(data->trig);
}
mutex_lock(&data->mutex);
kxcjk1013_set_mode(data, STANDBY);
mutex_unlock(&data->mutex);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int kxcjk1013_suspend(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct kxcjk1013_data *data = iio_priv(indio_dev);
mutex_lock(&data->mutex);
kxcjk1013_set_mode(data, STANDBY);
mutex_unlock(&data->mutex);
return 0;
}
static int kxcjk1013_resume(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct kxcjk1013_data *data = iio_priv(indio_dev);
mutex_lock(&data->mutex);
if (data->power_state)
kxcjk1013_set_mode(data, OPERATION);
mutex_unlock(&data->mutex);
return 0;
}
static SIMPLE_DEV_PM_OPS(kxcjk1013_pm_ops, kxcjk1013_suspend, kxcjk1013_resume);
#define KXCJK1013_PM_OPS (&kxcjk1013_pm_ops)
#else
#define KXCJK1013_PM_OPS NULL
#endif
static const struct acpi_device_id kx_acpi_match[] = {
{"KXCJ1013", 0},
{ },
};
MODULE_DEVICE_TABLE(acpi, kx_acpi_match);
static const struct i2c_device_id kxcjk1013_id[] = {
{"kxcjk1013", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, kxcjk1013_id);
static struct i2c_driver kxcjk1013_driver = {
.driver = {
.name = KXCJK1013_DRV_NAME,
.acpi_match_table = ACPI_PTR(kx_acpi_match),
.pm = KXCJK1013_PM_OPS,
},
.probe = kxcjk1013_probe,
.remove = kxcjk1013_remove,
.id_table = kxcjk1013_id,
};
module_i2c_driver(kxcjk1013_driver);
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("KXCJK1013 accelerometer driver");
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