- 根目录:
- drivers
- iio
- accel
- mma9551.c
/*
* Freescale MMA9551L Intelligent Motion-Sensing Platform 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/slab.h>
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/events.h>
#include <linux/pm_runtime.h>
#include "mma9551_core.h"
#define MMA9551_DRV_NAME "mma9551"
#define MMA9551_IRQ_NAME "mma9551_event"
#define MMA9551_GPIO_NAME "mma9551_int"
#define MMA9551_GPIO_COUNT 4
/* Tilt application (inclination in IIO terms). */
#define MMA9551_TILT_XZ_ANG_REG 0x00
#define MMA9551_TILT_YZ_ANG_REG 0x01
#define MMA9551_TILT_XY_ANG_REG 0x02
#define MMA9551_TILT_ANGFLG BIT(7)
#define MMA9551_TILT_QUAD_REG 0x03
#define MMA9551_TILT_XY_QUAD_SHIFT 0
#define MMA9551_TILT_YZ_QUAD_SHIFT 2
#define MMA9551_TILT_XZ_QUAD_SHIFT 4
#define MMA9551_TILT_CFG_REG 0x01
#define MMA9551_TILT_ANG_THRESH_MASK GENMASK(3, 0)
#define MMA9551_DEFAULT_SAMPLE_RATE 122 /* Hz */
/* Tilt events are mapped to the first three GPIO pins. */
enum mma9551_tilt_axis {
mma9551_x = 0,
mma9551_y,
mma9551_z,
};
struct mma9551_data {
struct i2c_client *client;
struct mutex mutex;
int event_enabled[3];
int irqs[MMA9551_GPIO_COUNT];
};
static int mma9551_read_incli_chan(struct i2c_client *client,
const struct iio_chan_spec *chan,
int *val)
{
u8 quad_shift, angle, quadrant;
u16 reg_addr;
int ret;
switch (chan->channel2) {
case IIO_MOD_X:
reg_addr = MMA9551_TILT_YZ_ANG_REG;
quad_shift = MMA9551_TILT_YZ_QUAD_SHIFT;
break;
case IIO_MOD_Y:
reg_addr = MMA9551_TILT_XZ_ANG_REG;
quad_shift = MMA9551_TILT_XZ_QUAD_SHIFT;
break;
case IIO_MOD_Z:
reg_addr = MMA9551_TILT_XY_ANG_REG;
quad_shift = MMA9551_TILT_XY_QUAD_SHIFT;
break;
default:
return -EINVAL;
}
ret = mma9551_set_power_state(client, true);
if (ret < 0)
return ret;
ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
reg_addr, &angle);
if (ret < 0)
goto out_poweroff;
ret = mma9551_read_status_byte(client, MMA9551_APPID_TILT,
MMA9551_TILT_QUAD_REG, &quadrant);
if (ret < 0)
goto out_poweroff;
angle &= ~MMA9551_TILT_ANGFLG;
quadrant = (quadrant >> quad_shift) & 0x03;
if (quadrant == 1 || quadrant == 3)
*val = 90 * (quadrant + 1) - angle;
else
*val = angle + 90 * quadrant;
ret = IIO_VAL_INT;
out_poweroff:
mma9551_set_power_state(client, false);
return ret;
}
static int mma9551_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct mma9551_data *data = iio_priv(indio_dev);
int ret;
switch (mask) {
case IIO_CHAN_INFO_PROCESSED:
switch (chan->type) {
case IIO_INCLI:
mutex_lock(&data->mutex);
ret = mma9551_read_incli_chan(data->client, chan, val);
mutex_unlock(&data->mutex);
return ret;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_RAW:
switch (chan->type) {
case IIO_ACCEL:
mutex_lock(&data->mutex);
ret = mma9551_read_accel_chan(data->client,
chan, val, val2);
mutex_unlock(&data->mutex);
return ret;
default:
return -EINVAL;
}
case IIO_CHAN_INFO_SCALE:
switch (chan->type) {
case IIO_ACCEL:
return mma9551_read_accel_scale(val, val2);
default:
return -EINVAL;
}
default:
return -EINVAL;
}
}
static int mma9551_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 mma9551_data *data = iio_priv(indio_dev);
switch (chan->type) {
case IIO_INCLI:
/* IIO counts axes from 1, because IIO_NO_MOD is 0. */
return data->event_enabled[chan->channel2 - 1];
default:
return -EINVAL;
}
}
static int mma9551_config_incli_event(struct iio_dev *indio_dev,
enum iio_modifier axis,
int state)
{
struct mma9551_data *data = iio_priv(indio_dev);
enum mma9551_tilt_axis mma_axis;
int ret;
/* IIO counts axes from 1, because IIO_NO_MOD is 0. */
mma_axis = axis - 1;
if (data->event_enabled[mma_axis] == state)
return 0;
if (state == 0) {
ret = mma9551_gpio_config(data->client,
(enum mma9551_gpio_pin)mma_axis,
MMA9551_APPID_NONE, 0, 0);
if (ret < 0)
return ret;
ret = mma9551_set_power_state(data->client, false);
if (ret < 0)
return ret;
} else {
int bitnum;
/* Bit 7 of each angle register holds the angle flag. */
switch (axis) {
case IIO_MOD_X:
bitnum = 7 + 8 * MMA9551_TILT_YZ_ANG_REG;
break;
case IIO_MOD_Y:
bitnum = 7 + 8 * MMA9551_TILT_XZ_ANG_REG;
break;
case IIO_MOD_Z:
bitnum = 7 + 8 * MMA9551_TILT_XY_ANG_REG;
break;
default:
return -EINVAL;
}
ret = mma9551_set_power_state(data->client, true);
if (ret < 0)
return ret;
ret = mma9551_gpio_config(data->client,
(enum mma9551_gpio_pin)mma_axis,
MMA9551_APPID_TILT, bitnum, 0);
if (ret < 0) {
mma9551_set_power_state(data->client, false);
return ret;
}
}
data->event_enabled[mma_axis] = state;
return ret;
}
static int mma9551_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 mma9551_data *data = iio_priv(indio_dev);
int ret;
switch (chan->type) {
case IIO_INCLI:
mutex_lock(&data->mutex);
ret = mma9551_config_incli_event(indio_dev,
chan->channel2, state);
mutex_unlock(&data->mutex);
return ret;
default:
return -EINVAL;
}
}
static int mma9551_write_event_value(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 mma9551_data *data = iio_priv(indio_dev);
int ret;
switch (chan->type) {
case IIO_INCLI:
if (val2 != 0 || val < 1 || val > 10)
return -EINVAL;
mutex_lock(&data->mutex);
ret = mma9551_update_config_bits(data->client,
MMA9551_APPID_TILT,
MMA9551_TILT_CFG_REG,
MMA9551_TILT_ANG_THRESH_MASK,
val);
mutex_unlock(&data->mutex);
return ret;
default:
return -EINVAL;
}
}
static int mma9551_read_event_value(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 mma9551_data *data = iio_priv(indio_dev);
int ret;
u8 tmp;
switch (chan->type) {
case IIO_INCLI:
mutex_lock(&data->mutex);
ret = mma9551_read_config_byte(data->client,
MMA9551_APPID_TILT,
MMA9551_TILT_CFG_REG, &tmp);
mutex_unlock(&data->mutex);
if (ret < 0)
return ret;
*val = tmp & MMA9551_TILT_ANG_THRESH_MASK;
*val2 = 0;
return IIO_VAL_INT;
default:
return -EINVAL;
}
}
static const struct iio_event_spec mma9551_incli_event = {
.type = IIO_EV_TYPE_ROC,
.dir = IIO_EV_DIR_RISING,
.mask_separate = BIT(IIO_EV_INFO_ENABLE),
.mask_shared_by_type = BIT(IIO_EV_INFO_VALUE),
};
#define MMA9551_INCLI_CHANNEL(axis) { \
.type = IIO_INCLI, \
.modified = 1, \
.channel2 = axis, \
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), \
.event_spec = &mma9551_incli_event, \
.num_event_specs = 1, \
}
static const struct iio_chan_spec mma9551_channels[] = {
MMA9551_ACCEL_CHANNEL(IIO_MOD_X),
MMA9551_ACCEL_CHANNEL(IIO_MOD_Y),
MMA9551_ACCEL_CHANNEL(IIO_MOD_Z),
MMA9551_INCLI_CHANNEL(IIO_MOD_X),
MMA9551_INCLI_CHANNEL(IIO_MOD_Y),
MMA9551_INCLI_CHANNEL(IIO_MOD_Z),
};
static const struct iio_info mma9551_info = {
.driver_module = THIS_MODULE,
.read_raw = mma9551_read_raw,
.read_event_config = mma9551_read_event_config,
.write_event_config = mma9551_write_event_config,
.read_event_value = mma9551_read_event_value,
.write_event_value = mma9551_write_event_value,
};
static irqreturn_t mma9551_event_handler(int irq, void *private)
{
struct iio_dev *indio_dev = private;
struct mma9551_data *data = iio_priv(indio_dev);
int i, ret, mma_axis = -1;
u16 reg;
u8 val;
mutex_lock(&data->mutex);
for (i = 0; i < 3; i++)
if (irq == data->irqs[i]) {
mma_axis = i;
break;
}
if (mma_axis == -1) {
/* IRQ was triggered on 4th line, which we don't use. */
dev_warn(&data->client->dev,
"irq triggered on unused line %d\n", data->irqs[3]);
goto out;
}
switch (mma_axis) {
case mma9551_x:
reg = MMA9551_TILT_YZ_ANG_REG;
break;
case mma9551_y:
reg = MMA9551_TILT_XZ_ANG_REG;
break;
case mma9551_z:
reg = MMA9551_TILT_XY_ANG_REG;
break;
}
/*
* Read the angle even though we don't use it, otherwise we
* won't get any further interrupts.
*/
ret = mma9551_read_status_byte(data->client, MMA9551_APPID_TILT,
reg, &val);
if (ret < 0) {
dev_err(&data->client->dev,
"error %d reading tilt register in IRQ\n", ret);
goto out;
}
iio_push_event(indio_dev,
IIO_MOD_EVENT_CODE(IIO_INCLI, 0, (mma_axis + 1),
IIO_EV_TYPE_ROC, IIO_EV_DIR_RISING),
iio_get_time_ns());
out:
mutex_unlock(&data->mutex);
return IRQ_HANDLED;
}
static int mma9551_init(struct mma9551_data *data)
{
int ret;
ret = mma9551_read_version(data->client);
if (ret)
return ret;
return mma9551_set_device_state(data->client, true);
}
static int mma9551_gpio_probe(struct iio_dev *indio_dev)
{
struct gpio_desc *gpio;
int i, ret;
struct mma9551_data *data = iio_priv(indio_dev);
struct device *dev = &data->client->dev;
for (i = 0; i < MMA9551_GPIO_COUNT; i++) {
gpio = devm_gpiod_get_index(dev, MMA9551_GPIO_NAME, i,
GPIOD_IN);
if (IS_ERR(gpio)) {
dev_err(dev, "acpi gpio get index failed\n");
return PTR_ERR(gpio);
}
ret = gpiod_to_irq(gpio);
if (ret < 0)
return ret;
data->irqs[i] = ret;
ret = devm_request_threaded_irq(dev, data->irqs[i],
NULL, mma9551_event_handler,
IRQF_TRIGGER_RISING | IRQF_ONESHOT,
MMA9551_IRQ_NAME, indio_dev);
if (ret < 0) {
dev_err(dev, "request irq %d failed\n", data->irqs[i]);
return ret;
}
dev_dbg(dev, "gpio resource, no:%d irq:%d\n",
desc_to_gpio(gpio), data->irqs[i]);
}
return 0;
}
static const char *mma9551_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 int mma9551_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct mma9551_data *data;
struct iio_dev *indio_dev;
const char *name = NULL;
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;
if (id)
name = id->name;
else if (ACPI_HANDLE(&client->dev))
name = mma9551_match_acpi_device(&client->dev);
ret = mma9551_init(data);
if (ret < 0)
return ret;
mutex_init(&data->mutex);
indio_dev->dev.parent = &client->dev;
indio_dev->channels = mma9551_channels;
indio_dev->num_channels = ARRAY_SIZE(mma9551_channels);
indio_dev->name = name;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &mma9551_info;
ret = mma9551_gpio_probe(indio_dev);
if (ret < 0)
goto out_poweroff;
ret = iio_device_register(indio_dev);
if (ret < 0) {
dev_err(&client->dev, "unable to register iio device\n");
goto out_poweroff;
}
ret = pm_runtime_set_active(&client->dev);
if (ret < 0)
goto out_iio_unregister;
pm_runtime_enable(&client->dev);
pm_runtime_set_autosuspend_delay(&client->dev,
MMA9551_AUTO_SUSPEND_DELAY_MS);
pm_runtime_use_autosuspend(&client->dev);
return 0;
out_iio_unregister:
iio_device_unregister(indio_dev);
out_poweroff:
mma9551_set_device_state(client, false);
return ret;
}
static int mma9551_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct mma9551_data *data = iio_priv(indio_dev);
pm_runtime_disable(&client->dev);
pm_runtime_set_suspended(&client->dev);
pm_runtime_put_noidle(&client->dev);
iio_device_unregister(indio_dev);
mutex_lock(&data->mutex);
mma9551_set_device_state(data->client, false);
mutex_unlock(&data->mutex);
return 0;
}
#ifdef CONFIG_PM
static int mma9551_runtime_suspend(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct mma9551_data *data = iio_priv(indio_dev);
int ret;
mutex_lock(&data->mutex);
ret = mma9551_set_device_state(data->client, false);
mutex_unlock(&data->mutex);
if (ret < 0) {
dev_err(&data->client->dev, "powering off device failed\n");
return -EAGAIN;
}
return 0;
}
static int mma9551_runtime_resume(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct mma9551_data *data = iio_priv(indio_dev);
int ret;
ret = mma9551_set_device_state(data->client, true);
if (ret < 0)
return ret;
mma9551_sleep(MMA9551_DEFAULT_SAMPLE_RATE);
return 0;
}
#endif
#ifdef CONFIG_PM_SLEEP
static int mma9551_suspend(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct mma9551_data *data = iio_priv(indio_dev);
int ret;
mutex_lock(&data->mutex);
ret = mma9551_set_device_state(data->client, false);
mutex_unlock(&data->mutex);
return ret;
}
static int mma9551_resume(struct device *dev)
{
struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
struct mma9551_data *data = iio_priv(indio_dev);
int ret;
mutex_lock(&data->mutex);
ret = mma9551_set_device_state(data->client, true);
mutex_unlock(&data->mutex);
return ret;
}
#endif
static const struct dev_pm_ops mma9551_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(mma9551_suspend, mma9551_resume)
SET_RUNTIME_PM_OPS(mma9551_runtime_suspend,
mma9551_runtime_resume, NULL)
};
static const struct acpi_device_id mma9551_acpi_match[] = {
{"MMA9551", 0},
{},
};
MODULE_DEVICE_TABLE(acpi, mma9551_acpi_match);
static const struct i2c_device_id mma9551_id[] = {
{"mma9551", 0},
{}
};
MODULE_DEVICE_TABLE(i2c, mma9551_id);
static struct i2c_driver mma9551_driver = {
.driver = {
.name = MMA9551_DRV_NAME,
.acpi_match_table = ACPI_PTR(mma9551_acpi_match),
.pm = &mma9551_pm_ops,
},
.probe = mma9551_probe,
.remove = mma9551_remove,
.id_table = mma9551_id,
};
module_i2c_driver(mma9551_driver);
MODULE_AUTHOR("Irina Tirdea <irina.tirdea@intel.com>");
MODULE_AUTHOR("Vlad Dogaru <vlad.dogaru@intel.com>");
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("MMA9551L motion-sensing platform driver");