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Commit c3a23ecc authored by Daniel Baluta's avatar Daniel Baluta Committed by Jonathan Cameron
Browse files

iio: imu: kmx61: Add support for data ready triggers 



This creates a data ready trigger per IIO device.

Signed-off-by: default avatarDaniel Baluta <daniel.baluta@intel.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 3b9c40e6

drivers/iio/imu/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -28,6 +28,8 @@ config ADIS16480 
config KMX61

	tristate "Kionix KMX61 6-axis accelerometer and magnetometer"

	depends on I2C

	select IIO_BUFFER

	select IIO_TRIGGERED_BUFFER

	help

	  Say Y here if you want to build a driver for Kionix KMX61 6-axis

	  accelerometer and magnetometer.

drivers/iio/imu/kmx61.c

+294 −1
Original line number Diff line number Diff line
@@ -20,9 +20,14 @@ 
#include <linux/pm_runtime.h>

#include <linux/iio/iio.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 KMX61_DRV_NAME "kmx61"

#define KMX61_GPIO_NAME "kmx61_int"

#define KMX61_IRQ_NAME "kmx61_event"



#define KMX61_REG_WHO_AM_I	0x00
@@ -55,9 +60,11 @@ 
#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_ODCNTL	0x2C

#define KMX61_REG_INC1		0x2D



#define KMX61_ACC_STBY_BIT	BIT(0)

#define KMX61_MAG_STBY_BIT	BIT(1)
@@ -67,6 +74,13 @@ 


#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_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
@@ -100,9 +114,13 @@ struct kmx61_data { 


	/* accelerometer specific data */

	struct iio_dev *acc_indio_dev;

	struct iio_trigger *acc_dready_trig;

	bool acc_dready_trig_on;



	/* magnetometer specific data */

	struct iio_dev *mag_indio_dev;

	struct iio_trigger *mag_dready_trig;

	bool mag_dready_trig_on;

};



enum kmx61_range {
@@ -466,6 +484,69 @@ static int kmx61_chip_init(struct kmx61_data *data) 
	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;

	}



	ret = kmx61_set_mode(data, mode, KMX61_ACC | KMX61_MAG, true);

	if (ret)

		return ret;



	return 0;

}



/**

 * kmx61_set_power_state() - set power state for kmx61 @device

 * @data - kmx61 device private pointer
@@ -626,11 +707,34 @@ static int kmx61_write_raw(struct iio_dev *indio_dev, 
	}

}



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)

		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 = {

	.driver_module		= THIS_MODULE,

	.read_raw		= kmx61_read_raw,

	.write_raw		= kmx61_write_raw,

	.attrs			= &kmx61_acc_attribute_group,

	.validate_trigger	= kmx61_acc_validate_trigger,

};



static const struct iio_info kmx61_mag_info = {
@@ -638,8 +742,109 @@ 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 = iio_priv(indio_dev);



	mutex_lock(&data->lock);



	if (data->acc_dready_trig == trig)

		device = KMX61_ACC;

	else

		device = KMX61_MAG;



	ret = kmx61_set_power_state(data, state, device);

	if (ret < 0) {

		mutex_unlock(&data->lock);

		return ret;

	}



	ret = kmx61_setup_new_data_interrupt(data, state, device);

	if (ret < 0) {

		kmx61_set_power_state(data, false, device);

		mutex_unlock(&data->lock);

		return ret;

	}



	if (data->acc_dready_trig == trig)

		data->acc_dready_trig_on = state;

	else

		data->mag_dready_trig_on = state;



	mutex_unlock(&data->lock);



	return 0;

}



static int kmx61_trig_try_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");

		return ret;

	}



	return 0;

}



static const struct iio_trigger_ops kmx61_trigger_ops = {

	.set_trigger_state = kmx61_data_rdy_trigger_set_state,

	.try_reenable = kmx61_trig_try_reenable,

	.owner = THIS_MODULE,

};



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);



	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;

	s16 buffer[8];



	mutex_lock(&data->lock);

	for_each_set_bit(bit, indio_dev->buffer->scan_mask,

			 indio_dev->masklength) {

		ret = kmx61_read_measurement(data, KMX61_ACC_XOUT_L, 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;
@@ -702,6 +907,32 @@ static struct iio_dev *kmx61_indiodev_setup(struct kmx61_data *data, 
	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)

{
@@ -748,10 +979,55 @@ static int kmx61_probe(struct i2c_client *client, 
	if (client->irq < 0)

		client->irq = kmx61_gpio_probe(client, data);



	if (client->irq >= 0) {

		ret = devm_request_threaded_irq(&client->dev, client->irq,

						kmx61_data_rdy_trig_poll,

						NULL,

						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))

			return PTR_ERR(data->acc_dready_trig);



		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;

		}



		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;

		}



		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_trigger_unregister;

		}

	}



	ret = iio_device_register(data->acc_indio_dev);

	if (ret < 0) {

		dev_err(&client->dev, "Failed to register acc iio device\n");

		goto err_chip_uninit;

		goto err_buffer_cleanup;

	}



	ret = iio_device_register(data->mag_indio_dev);
@@ -774,6 +1050,16 @@ static int kmx61_probe(struct i2c_client *client, 
	iio_device_unregister(data->mag_indio_dev);

err_iio_unregister_acc:

	iio_device_unregister(data->acc_indio_dev);

err_buffer_cleanup:

	if (client->irq >= 0) {

		iio_triggered_buffer_cleanup(data->acc_indio_dev);

		iio_triggered_buffer_cleanup(data->mag_indio_dev);

	}

err_trigger_unregister:

	if (data->acc_dready_trig)

		iio_trigger_unregister(data->acc_dready_trig);

	if (data->mag_dready_trig)

		iio_trigger_unregister(data->mag_dready_trig);

err_chip_uninit:

	kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, true);

	return ret;
@@ -790,6 +1076,13 @@ static int kmx61_remove(struct i2c_client *client) 
	iio_device_unregister(data->acc_indio_dev);

	iio_device_unregister(data->mag_indio_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);

	}



	mutex_lock(&data->lock);

	kmx61_set_mode(data, KMX61_ALL_STBY, KMX61_ACC | KMX61_MAG, true);

	mutex_unlock(&data->lock);