Release 4.8 drivers/iio/accel/stk8312.c

Directory: drivers/iio/accel
/**
 * Sensortek STK8312 3-Axis Accelerometer
 *
 * Copyright (c) 2015, Intel Corporation.
 *
 * This file is subject to the terms and conditions of version 2 of
 * the GNU General Public License. See the file COPYING in the main
 * directory of this archive for more details.
 *
 * IIO driver for STK8312; 7-bit I2C address: 0x3D.
 */

#include <linux/acpi.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/iio/buffer.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>


#define STK8312_REG_XOUT		0x00

#define STK8312_REG_YOUT		0x01

#define STK8312_REG_ZOUT		0x02

#define STK8312_REG_INTSU		0x06

#define STK8312_REG_MODE		0x07

#define STK8312_REG_SR			0x08

#define STK8312_REG_STH			0x13

#define STK8312_REG_RESET		0x20

#define STK8312_REG_AFECTRL		0x24

#define STK8312_REG_OTPADDR		0x3D

#define STK8312_REG_OTPDATA		0x3E

#define STK8312_REG_OTPCTRL		0x3F


#define STK8312_MODE_ACTIVE		BIT(0)

#define STK8312_MODE_STANDBY		0x00

#define STK8312_MODE_INT_AH_PP		0xC0	
/* active-high, push-pull */

#define STK8312_DREADY_BIT		BIT(4)

#define STK8312_RNG_6G			1

#define STK8312_RNG_SHIFT		6

#define STK8312_RNG_MASK		GENMASK(7, 6)

#define STK8312_SR_MASK			GENMASK(2, 0)

#define STK8312_SR_400HZ_IDX		0

#define STK8312_ALL_CHANNEL_MASK	GENMASK(2, 0)

#define STK8312_ALL_CHANNEL_SIZE	3


#define STK8312_DRIVER_NAME		"stk8312"

#define STK8312_IRQ_NAME		"stk8312_event"

/*
 * The accelerometer has two measurement ranges:
 *
 * -6g - +6g (8-bit, signed)
 * -16g - +16g (8-bit, signed)
 *
 * scale1 = (6 + 6) * 9.81 / (2^8 - 1)     = 0.4616
 * scale2 = (16 + 16) * 9.81 / (2^8 - 1)   = 1.2311
 */

#define STK8312_SCALE_AVAIL		"0.4616 1.2311"


static const int stk8312_scale_table[][2] = {
	{0, 461600}, {1, 231100}
};

static const struct {
	
int val;
	
int val2;
} 
stk8312_samp_freq_table[] = {
	{400, 0}, {200, 0}, {100, 0}, {50, 0}, {25, 0},
	{12, 500000}, {6, 250000}, {3, 125000}
};


#define STK8312_ACCEL_CHANNEL(index, reg, axis) {                       \
        .type = IIO_ACCEL,                                              \
        .address = reg,                                                 \
        .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 = index,                                            \
        .scan_type = {                                                  \
                .sign = 's',                                            \
                .realbits = 8,                                          \
                .storagebits = 8,                                       \
                .endianness = IIO_CPU,                                  \
        },                                                              \
}


static const struct iio_chan_spec stk8312_channels[] = {
	STK8312_ACCEL_CHANNEL(0, STK8312_REG_XOUT, X),
	STK8312_ACCEL_CHANNEL(1, STK8312_REG_YOUT, Y),
	STK8312_ACCEL_CHANNEL(2, STK8312_REG_ZOUT, Z),
	IIO_CHAN_SOFT_TIMESTAMP(3),
};


struct stk8312_data {
	
struct i2c_client *client;
	
struct mutex lock;
	
u8 range;
	
u8 sample_rate_idx;
	
u8 mode;
	
struct iio_trigger *dready_trig;
	
bool dready_trigger_on;
	
s8 buffer[16]; /* 3x8-bit channels + 5x8 padding + 64-bit timestamp */
};

static IIO_CONST_ATTR(in_accel_scale_available, STK8312_SCALE_AVAIL);

static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("3.125 6.25 12.5 25 50 100 200 400");


static struct attribute *stk8312_attributes[] = {
	&iio_const_attr_in_accel_scale_available.dev_attr.attr,
	&iio_const_attr_sampling_frequency_available.dev_attr.attr,
	NULL,
};


static const struct attribute_group stk8312_attribute_group = {
	.attrs = stk8312_attributes
};



static int stk8312_otp_init(struct stk8312_data *data)
{
	int ret;
	int count = 10;
	struct i2c_client *client = data->client;

	ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPADDR, 0x70);
	if (ret < 0)
		goto exit_err;
	ret = i2c_smbus_write_byte_data(client, STK8312_REG_OTPCTRL, 0x02);
	if (ret < 0)
		goto exit_err;

	do {
		usleep_range(1000, 5000);
		ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPCTRL);
		if (ret < 0)
			goto exit_err;
		count--;
	} while (!(ret & BIT(7)) && count > 0);

	if (count == 0) {
		ret = -ETIMEDOUT;
		goto exit_err;
	}

	ret = i2c_smbus_read_byte_data(client, STK8312_REG_OTPDATA);
	if (ret == 0)
		ret = -EINVAL;
	if (ret < 0)
		goto exit_err;

	ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_AFECTRL, ret);
	if (ret < 0)
		goto exit_err;
	msleep(150);

	return 0;

exit_err:
	dev_err(&client->dev, "failed to initialize sensor\n");
	return ret;
}

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static int stk8312_set_mode(struct stk8312_data *data, u8 mode)
{
	int ret;
	struct i2c_client *client = data->client;

	if (mode == data->mode)
		return 0;

	ret = i2c_smbus_write_byte_data(client, STK8312_REG_MODE, mode);
	if (ret < 0) {
		dev_err(&client->dev, "failed to change sensor mode\n");
		return ret;
	}

	data->mode = mode;
	if (mode & STK8312_MODE_ACTIVE) {
		/* Need to run OTP sequence before entering active mode */
		usleep_range(1000, 5000);
		ret = stk8312_otp_init(data);
	}

	return ret;
}

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static int stk8312_set_interrupts(struct stk8312_data *data, u8 int_mask)
{
	int ret;
	u8 mode;
	struct i2c_client *client = data->client;

	mode = data->mode;
	/* We need to go in standby mode to modify registers */
	ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_write_byte_data(client, STK8312_REG_INTSU, int_mask);
	if (ret < 0) {
		dev_err(&client->dev, "failed to set interrupts\n");
		stk8312_set_mode(data, mode);
		return ret;
	}

	return stk8312_set_mode(data, mode);
}

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static int stk8312_data_rdy_trigger_set_state(struct iio_trigger *trig,
					      bool state)
{
	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
	struct stk8312_data *data = iio_priv(indio_dev);
	int ret;

	if (state)
		ret = stk8312_set_interrupts(data, STK8312_DREADY_BIT);
	else
		ret = stk8312_set_interrupts(data, 0x00);

	if (ret < 0) {
		dev_err(&data->client->dev, "failed to set trigger state\n");
		return ret;
	}

	data->dready_trigger_on = state;

	return 0;
}

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static const struct iio_trigger_ops stk8312_trigger_ops = {
	.set_trigger_state = stk8312_data_rdy_trigger_set_state,
	.owner = THIS_MODULE,
};



static int stk8312_set_sample_rate(struct stk8312_data *data, u8 rate)
{
	int ret;
	u8 masked_reg;
	u8 mode;
	struct i2c_client *client = data->client;

	if (rate == data->sample_rate_idx)
		return 0;

	mode = data->mode;
	/* We need to go in standby mode to modify registers */
	ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_read_byte_data(client, STK8312_REG_SR);
	if (ret < 0)
		goto err_activate;

	masked_reg = (ret & (~STK8312_SR_MASK)) | rate;

	ret = i2c_smbus_write_byte_data(client, STK8312_REG_SR, masked_reg);
	if (ret < 0)
		goto err_activate;

	data->sample_rate_idx = rate;

	return stk8312_set_mode(data, mode);

err_activate:
	dev_err(&client->dev, "failed to set sampling rate\n");
	stk8312_set_mode(data, mode);

	return ret;
}

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static int stk8312_set_range(struct stk8312_data *data, u8 range)
{
	int ret;
	u8 masked_reg;
	u8 mode;
	struct i2c_client *client = data->client;

	if (range != 1 && range != 2)
		return -EINVAL;
	else if (range == data->range)
		return 0;

	mode = data->mode;
	/* We need to go in standby mode to modify registers */
	ret = stk8312_set_mode(data, STK8312_MODE_STANDBY);
	if (ret < 0)
		return ret;

	ret = i2c_smbus_read_byte_data(client, STK8312_REG_STH);
	if (ret < 0)
		goto err_activate;

	masked_reg = ret & (~STK8312_RNG_MASK);
	masked_reg |= range << STK8312_RNG_SHIFT;

	ret = i2c_smbus_write_byte_data(client, STK8312_REG_STH, masked_reg);
	if (ret < 0)
		goto err_activate;

	data->range = range;

	return stk8312_set_mode(data, mode);

err_activate:
	dev_err(&client->dev, "failed to change sensor range\n");
	stk8312_set_mode(data, mode);

	return ret;
}

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static int stk8312_read_accel(struct stk8312_data *data, u8 address)
{
	int ret;
	struct i2c_client *client = data->client;

	if (address > 2)
		return -EINVAL;

	ret = i2c_smbus_read_byte_data(client, address);
	if (ret < 0)
		dev_err(&client->dev, "register read failed\n");

	return ret;
}

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static int stk8312_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan,
			    int *val, int *val2, long mask)
{
	struct stk8312_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		if (iio_buffer_enabled(indio_dev))
			return -EBUSY;
		mutex_lock(&data->lock);
		ret = stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
		if (ret < 0) {
			mutex_unlock(&data->lock);
			return ret;
		}
		ret = stk8312_read_accel(data, chan->address);
		if (ret < 0) {
			stk8312_set_mode(data,
					 data->mode & (~STK8312_MODE_ACTIVE));
			mutex_unlock(&data->lock);
			return ret;
		}
		*val = sign_extend32(ret, 7);
		ret = stk8312_set_mode(data,
				       data->mode & (~STK8312_MODE_ACTIVE));
		mutex_unlock(&data->lock);
		if (ret < 0)
			return ret;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		*val = stk8312_scale_table[data->range - 1][0];
		*val2 = stk8312_scale_table[data->range - 1][1];
		return IIO_VAL_INT_PLUS_MICRO;
	case IIO_CHAN_INFO_SAMP_FREQ:
		*val = stk8312_samp_freq_table[data->sample_rate_idx].val;
		*val2 = stk8312_samp_freq_table[data->sample_rate_idx].val2;
		return IIO_VAL_INT_PLUS_MICRO;
	}

	return -EINVAL;
}

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static int stk8312_write_raw(struct iio_dev *indio_dev,
			     struct iio_chan_spec const *chan,
			     int val, int val2, long mask)
{
	int i;
	int index = -1;
	int ret;
	struct stk8312_data *data = iio_priv(indio_dev);

	switch (mask) {
	case IIO_CHAN_INFO_SCALE:
		for (i = 0; i < ARRAY_SIZE(stk8312_scale_table); i++)
			if (val == stk8312_scale_table[i][0] &&
			    val2 == stk8312_scale_table[i][1]) {
				index = i + 1;
				break;
			}
		if (index < 0)
			return -EINVAL;

		mutex_lock(&data->lock);
		ret = stk8312_set_range(data, index);
		mutex_unlock(&data->lock);

		return ret;
	case IIO_CHAN_INFO_SAMP_FREQ:
		for (i = 0; i < ARRAY_SIZE(stk8312_samp_freq_table); i++)
			if (val == stk8312_samp_freq_table[i].val &&
			    val2 == stk8312_samp_freq_table[i].val2) {
				index = i;
				break;
			}
		if (index < 0)
			return -EINVAL;
		mutex_lock(&data->lock);
		ret = stk8312_set_sample_rate(data, index);
		mutex_unlock(&data->lock);

		return ret;
	}

	return -EINVAL;
}

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static const struct iio_info stk8312_info = {
	.driver_module		= THIS_MODULE,
	.read_raw		= stk8312_read_raw,
	.write_raw		= stk8312_write_raw,
	.attrs			= &stk8312_attribute_group,
};



static irqreturn_t stk8312_trigger_handler(int irq, void *p)
{
	struct iio_poll_func *pf = p;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct stk8312_data *data = iio_priv(indio_dev);
	int bit, ret, i = 0;

	mutex_lock(&data->lock);
	/*
         * Do a bulk read if all channels are requested,
         * from 0x00 (XOUT) to 0x02 (ZOUT)
         */
	if (*(indio_dev->active_scan_mask) == STK8312_ALL_CHANNEL_MASK) {
		ret = i2c_smbus_read_i2c_block_data(data->client,
						    STK8312_REG_XOUT,
						    STK8312_ALL_CHANNEL_SIZE,
						    data->buffer);
		if (ret < STK8312_ALL_CHANNEL_SIZE) {
			dev_err(&data->client->dev, "register read failed\n");
			mutex_unlock(&data->lock);
			goto err;
		}
	} else {
		for_each_set_bit(bit, indio_dev->active_scan_mask,
				 indio_dev->masklength) {
			ret = stk8312_read_accel(data, bit);
			if (ret < 0) {
				mutex_unlock(&data->lock);
				goto err;
			}
			data->buffer[i++] = ret;
		}
	}
	mutex_unlock(&data->lock);

	iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
					   pf->timestamp);
err:
	iio_trigger_notify_done(indio_dev->trig);

	return IRQ_HANDLED;
}

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static irqreturn_t stk8312_data_rdy_trig_poll(int irq, void *private)
{
	struct iio_dev *indio_dev = private;
	struct stk8312_data *data = iio_priv(indio_dev);

	if (data->dready_trigger_on)
		iio_trigger_poll(data->dready_trig);

	return IRQ_HANDLED;
}

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static int stk8312_buffer_preenable(struct iio_dev *indio_dev)
{
	struct stk8312_data *data = iio_priv(indio_dev);

	return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
}

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static int stk8312_buffer_postdisable(struct iio_dev *indio_dev)
{
	struct stk8312_data *data = iio_priv(indio_dev);

	return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
}

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static const struct iio_buffer_setup_ops stk8312_buffer_setup_ops = {
	.preenable   = stk8312_buffer_preenable,
	.postenable  = iio_triggered_buffer_postenable,
	.predisable  = iio_triggered_buffer_predisable,
	.postdisable = stk8312_buffer_postdisable,
};



static int stk8312_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	int ret;
	struct iio_dev *indio_dev;
	struct stk8312_data *data;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	if (!indio_dev) {
		dev_err(&client->dev, "iio allocation failed!\n");
		return -ENOMEM;
	}

	data = iio_priv(indio_dev);
	data->client = client;
	i2c_set_clientdata(client, indio_dev);
	mutex_init(&data->lock);

	indio_dev->dev.parent = &client->dev;
	indio_dev->info = &stk8312_info;
	indio_dev->name = STK8312_DRIVER_NAME;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = stk8312_channels;
	indio_dev->num_channels = ARRAY_SIZE(stk8312_channels);

	/* A software reset is recommended at power-on */
	ret = i2c_smbus_write_byte_data(data->client, STK8312_REG_RESET, 0x00);
	if (ret < 0) {
		dev_err(&client->dev, "failed to reset sensor\n");
		return ret;
	}
	data->sample_rate_idx = STK8312_SR_400HZ_IDX;
	ret = stk8312_set_range(data, STK8312_RNG_6G);
	if (ret < 0)
		return ret;

	ret = stk8312_set_mode(data,
			       STK8312_MODE_INT_AH_PP | STK8312_MODE_ACTIVE);
	if (ret < 0)
		return ret;

	if (client->irq > 0) {
		ret = devm_request_threaded_irq(&client->dev, client->irq,
						stk8312_data_rdy_trig_poll,
						NULL,
						IRQF_TRIGGER_RISING |
						IRQF_ONESHOT,
						STK8312_IRQ_NAME,
						indio_dev);
		if (ret < 0) {
			dev_err(&client->dev, "request irq %d failed\n",
				client->irq);
			goto err_power_off;
		}

		data->dready_trig = devm_iio_trigger_alloc(&client->dev,
							   "%s-dev%d",
							   indio_dev->name,
							   indio_dev->id);
		if (!data->dready_trig) {
			ret = -ENOMEM;
			goto err_power_off;
		}

		data->dready_trig->dev.parent = &client->dev;
		data->dready_trig->ops = &stk8312_trigger_ops;
		iio_trigger_set_drvdata(data->dready_trig, indio_dev);
		ret = iio_trigger_register(data->dready_trig);
		if (ret) {
			dev_err(&client->dev, "iio trigger register failed\n");
			goto err_power_off;
		}
	}

	ret = iio_triggered_buffer_setup(indio_dev,
					 iio_pollfunc_store_time,
					 stk8312_trigger_handler,
					 &stk8312_buffer_setup_ops);
	if (ret < 0) {
		dev_err(&client->dev, "iio triggered buffer setup failed\n");
		goto err_trigger_unregister;
	}

	ret = iio_device_register(indio_dev);
	if (ret < 0) {
		dev_err(&client->dev, "device_register failed\n");
		goto err_buffer_cleanup;
	}

	return 0;

err_buffer_cleanup:
	iio_triggered_buffer_cleanup(indio_dev);
err_trigger_unregister:
	if (data->dready_trig)
		iio_trigger_unregister(data->dready_trig);
err_power_off:
	stk8312_set_mode(data, STK8312_MODE_STANDBY);
	return ret;
}

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static int stk8312_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	struct stk8312_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 stk8312_set_mode(data, STK8312_MODE_STANDBY);
}

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Total 62 100.00% 2 100.00%

#ifdef CONFIG_PM_SLEEP


static int stk8312_suspend(struct device *dev)
{
	struct stk8312_data *data;

	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));

	return stk8312_set_mode(data, data->mode & (~STK8312_MODE_ACTIVE));
}

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tiberiu breana tiberiu breana 44 100.00% 2 100.00%
Total 44 100.00% 2 100.00%



static int stk8312_resume(struct device *dev)
{
	struct stk8312_data *data;

	data = iio_priv(i2c_get_clientdata(to_i2c_client(dev)));

	return stk8312_set_mode(data, data->mode | STK8312_MODE_ACTIVE);
}

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Person Tokens Prop Commits CommitProp
tiberiu breana tiberiu breana 41 100.00% 2 100.00%
Total 41 100.00% 2 100.00%

static SIMPLE_DEV_PM_OPS(stk8312_pm_ops, stk8312_suspend, stk8312_resume);


#define STK8312_PM_OPS (&stk8312_pm_ops)
#else

#define STK8312_PM_OPS NULL
#endif


static const struct i2c_device_id stk8312_i2c_id[] = {
	{"STK8312", 0},
	{}
};
MODULE_DEVICE_TABLE(i2c, stk8312_i2c_id);


static const struct acpi_device_id stk8312_acpi_id[] = {
	{"STK8312", 0},
	{}
};

MODULE_DEVICE_TABLE(acpi, stk8312_acpi_id);


static struct i2c_driver stk8312_driver = {
	.driver = {
		.name = STK8312_DRIVER_NAME,
		.pm = STK8312_PM_OPS,
		.acpi_match_table = ACPI_PTR(stk8312_acpi_id),
        },
	.probe =            stk8312_probe,
	.remove =           stk8312_remove,
	.id_table =         stk8312_i2c_id,
};


module_i2c_driver(stk8312_driver);

MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
MODULE_DESCRIPTION("STK8312 3-Axis Accelerometer driver");
MODULE_LICENSE("GPL v2");
Overall Contributors
Person Tokens Prop Commits CommitProp
tiberiu breana tiberiu breana 2776 95.43% 3 30.00%
hartmut knaack hartmut knaack 125 4.30% 5 50.00%
javier martinez canillas javier martinez canillas 7 0.24% 1 10.00%
octavian purdila octavian purdila 1 0.03% 1 10.00%
Total 2909 100.00% 10 100.00%
  Directory: drivers/iio/accel

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
	Person	Tokens	Prop	Commits	CommitProp
tiberiu breana	tiberiu breana	183	88.83%	1	25.00%
hartmut knaack	hartmut knaack	23	11.17%	3	75.00%
	Total	206	100.00%	4	100.00%
cregit-Linux how code gets into the kernel

Release 4.8 drivers/iio/accel/stk8312.c

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