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iio: mxc4005: add data ready trigger for mxc4005

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Add iio trigger for the data ready interrupt that signals new
measurements for the X, Y and Z axes.

Signed-off-by: Teodora Baluta <teodora.baluta@intel.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Teodora Baluta 2015-08-20 17:37:33 +03:00 committed by Jonathan Cameron
parent 1ce0eda0f7
commit 47196620c8
1 changed files with 141 additions and 1 deletions
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142
drivers/iio/accel/mxc4005.c
View file

@ -17,13 +17,16 @@
#include <linux/i2c.h>
#include <linux/iio/iio.h>
#include <linux/acpi.h>
#include <linux/gpio/consumer.h>
#include <linux/regmap.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger.h>
#include <linux/iio/buffer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>
#define MXC4005_DRV_NAME "mxc4005"
#define MXC4005_IRQ_NAME "mxc4005_event"
#define MXC4005_REGMAP_NAME "mxc4005_regmap"
#define MXC4005_REG_XOUT_UPPER 0x03
@ -33,6 +36,12 @@
#define MXC4005_REG_ZOUT_UPPER 0x07
#define MXC4005_REG_ZOUT_LOWER 0x08
#define MXC4005_REG_INT_MASK1 0x0B
#define MXC4005_REG_INT_MASK1_BIT_DRDYE 0x01
#define MXC4005_REG_INT_CLR1 0x01
#define MXC4005_REG_INT_CLR1_BIT_DRDYC 0x01
#define MXC4005_REG_CONTROL 0x0D
#define MXC4005_REG_CONTROL_MASK_FSR GENMASK(6, 5)
#define MXC4005_CONTROL_FSR_SHIFT 5
@ -55,7 +64,9 @@ struct mxc4005_data {
struct device *dev;
struct mutex mutex;
struct regmap *regmap;
struct iio_trigger *dready_trig;
__be16 buffer[8];
bool trigger_enabled;
};
/*
@ -107,6 +118,8 @@ static bool mxc4005_is_readable_reg(struct device *dev, unsigned int reg)
static bool mxc4005_is_writeable_reg(struct device *dev, unsigned int reg)
{
switch (reg) {
case MXC4005_REG_INT_CLR1:
case MXC4005_REG_INT_MASK1:
case MXC4005_REG_CONTROL:
return true;
default:
@ -307,6 +320,91 @@ static irqreturn_t mxc4005_trigger_handler(int irq, void *private)
return IRQ_HANDLED;
}
static int mxc4005_clr_intr(struct mxc4005_data *data)
{
int ret;
/* clear interrupt */
ret = regmap_write(data->regmap, MXC4005_REG_INT_CLR1,
MXC4005_REG_INT_CLR1_BIT_DRDYC);
if (ret < 0) {
dev_err(data->dev, "failed to write to reg_int_clr1\n");
return ret;
}
return 0;
}
static int mxc4005_set_trigger_state(struct iio_trigger *trig,
bool state)
{
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
struct mxc4005_data *data = iio_priv(indio_dev);
int ret;
mutex_lock(&data->mutex);
if (state) {
ret = regmap_write(data->regmap, MXC4005_REG_INT_MASK1,
MXC4005_REG_INT_MASK1_BIT_DRDYE);
} else {
ret = regmap_write(data->regmap, MXC4005_REG_INT_MASK1,
~MXC4005_REG_INT_MASK1_BIT_DRDYE);
}
if (ret < 0) {
mutex_unlock(&data->mutex);
dev_err(data->dev, "failed to update reg_int_mask1");
return ret;
}
data->trigger_enabled = state;
mutex_unlock(&data->mutex);
return 0;
}
static int mxc4005_trigger_try_reen(struct iio_trigger *trig)
{
struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
struct mxc4005_data *data = iio_priv(indio_dev);
if (!data->dready_trig)
return 0;
return mxc4005_clr_intr(data);
}
static const struct iio_trigger_ops mxc4005_trigger_ops = {
.set_trigger_state = mxc4005_set_trigger_state,
.try_reenable = mxc4005_trigger_try_reen,
.owner = THIS_MODULE,
};
static int mxc4005_gpio_probe(struct i2c_client *client,
struct mxc4005_data *data)
{
struct device *dev;
struct gpio_desc *gpio;
int ret;
if (!client)
return -EINVAL;
dev = &client->dev;
gpio = devm_gpiod_get_index(dev, "mxc4005_int", 0, GPIOD_IN);
if (IS_ERR(gpio)) {
dev_err(dev, "failed to get acpi gpio index\n");
return PTR_ERR(gpio);
}
ret = gpiod_to_irq(gpio);
dev_dbg(dev, "GPIO resource, no:%d irq:%d\n", desc_to_gpio(gpio), ret);
return ret;
}
static int mxc4005_chip_init(struct mxc4005_data *data)
{
int ret;
@ -363,7 +461,7 @@ static int mxc4005_probe(struct i2c_client *client,
indio_dev->info = &mxc4005_info;
ret = iio_triggered_buffer_setup(indio_dev,
&iio_pollfunc_store_time,
iio_pollfunc_store_time,
mxc4005_trigger_handler,
NULL);
if (ret < 0) {
@ -372,6 +470,43 @@ static int mxc4005_probe(struct i2c_client *client,
return ret;
}
if (client->irq < 0)
client->irq = mxc4005_gpio_probe(client, data);
if (client->irq > 0) {
data->dready_trig = devm_iio_trigger_alloc(&client->dev,
"%s-dev%d",
indio_dev->name,
indio_dev->id);
if (!data->dready_trig)
return -ENOMEM;
ret = devm_request_threaded_irq(&client->dev, client->irq,
iio_trigger_generic_data_rdy_poll,
NULL,
IRQF_TRIGGER_FALLING |
IRQF_ONESHOT,
MXC4005_IRQ_NAME,
data->dready_trig);
if (ret) {
dev_err(&client->dev,
"failed to init threaded irq\n");
goto err_buffer_cleanup;
}
data->dready_trig->dev.parent = &client->dev;
data->dready_trig->ops = &mxc4005_trigger_ops;
iio_trigger_set_drvdata(data->dready_trig, indio_dev);
indio_dev->trig = data->dready_trig;
iio_trigger_get(indio_dev->trig);
ret = iio_trigger_register(data->dready_trig);
if (ret) {
dev_err(&client->dev,
"failed to register trigger\n");
goto err_trigger_unregister;
}
}
ret = iio_device_register(indio_dev);
if (ret < 0) {
dev_err(&client->dev,
@ -381,6 +516,8 @@ static int mxc4005_probe(struct i2c_client *client,
return 0;
err_trigger_unregister:
iio_trigger_unregister(data->dready_trig);
err_buffer_cleanup:
iio_triggered_buffer_cleanup(indio_dev);
@ -390,10 +527,13 @@ static int mxc4005_probe(struct i2c_client *client,
static int mxc4005_remove(struct i2c_client *client)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct mxc4005_data *data = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
iio_triggered_buffer_cleanup(indio_dev);
if (data->dready_trig)
iio_trigger_unregister(data->dready_trig);
return 0;
}