[deliverable/linux.git] / drivers / iio / accel / bma180.c

/*
 * bma180.c - IIO driver for Bosch BMA180 triaxial acceleration sensor
 *
 * Copyright 2013 Oleksandr Kravchenko <x0199363@ti.com>
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <linux/of.h>
#include <linux/bitops.h>
#include <linux/slab.h>
#include <linux/string.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>

#define BMA180_DRV_NAME "bma180"
#define BMA180_IRQ_NAME "bma180_event"

/* Register set */
#define BMA180_CHIP_ID		0x00 /* Need to distinguish BMA180 from other */
#define BMA180_ACC_X_LSB	0x02 /* First of 6 registers of accel data */
#define BMA180_CTRL_REG0	0x0d
#define BMA180_RESET		0x10
#define BMA180_BW_TCS		0x20
#define BMA180_CTRL_REG3	0x21
#define BMA180_TCO_Z		0x30
#define BMA180_OFFSET_LSB1	0x35

/* BMA180_CTRL_REG0 bits */
#define BMA180_DIS_WAKE_UP	BIT(0) /* Disable wake up mode */
#define BMA180_SLEEP		BIT(1) /* 1 - chip will sleep */
#define BMA180_EE_W		BIT(4) /* Unlock writing to addr from 0x20 */
#define BMA180_RESET_INT	BIT(6) /* Reset pending interrupts */

/* BMA180_CTRL_REG3 bits */
#define BMA180_NEW_DATA_INT	BIT(1) /* Intr every new accel data is ready */

/* BMA180_OFFSET_LSB1 skipping mode bit */
#define BMA180_SMP_SKIP		BIT(0)

/* Bit masks for registers bit fields */
#define BMA180_RANGE		0x0e /* Range of measured accel values*/
#define BMA180_BW		0xf0 /* Accel bandwidth */
#define BMA180_MODE_CONFIG	0x03 /* Config operation modes */

/* We have to write this value in reset register to do soft reset */
#define BMA180_RESET_VAL	0xb6

#define BMA_180_ID_REG_VAL	0x03

/* Chip power modes */
#define BMA180_LOW_NOISE	0x00
#define BMA180_LOW_POWER	0x03

#define BMA180_LOW_NOISE_STR	"low_noise"
#define BMA180_LOW_POWER_STR	"low_power"

/* Defaults values */
#define BMA180_DEF_PMODE	0
#define BMA180_DEF_BW		20
#define BMA180_DEF_SCALE	2452

/* Available values for sysfs */
#define BMA180_FLP_FREQ_AVAILABLE \
	"10 20 40 75 150 300"
#define BMA180_SCALE_AVAILABLE \
	"0.001275 0.001863 0.002452 0.003727 0.004903 0.009709 0.019417"

struct bma180_data {
	struct i2c_client *client;
	struct iio_trigger *trig;
	struct mutex mutex;
	int sleep_state;
	int scale;
	int bw;
	int pmode;
	char *buff;
};

enum bma180_axis {
	AXIS_X,
	AXIS_Y,
	AXIS_Z,
};

static int bw_table[] = { 10, 20, 40, 75, 150, 300 }; /* Hz */
static int scale_table[] = { 1275, 1863, 2452, 3727, 4903, 9709, 19417 };

static int bma180_get_acc_reg(struct bma180_data *data, enum bma180_axis axis)
{
	u8 reg = BMA180_ACC_X_LSB + axis * 2;
	int ret;

	if (data->sleep_state)
		return -EBUSY;

	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;
}

static int bma180_set_bits(struct bma180_data *data, u8 reg, u8 mask, u8 val)
{
	int ret = i2c_smbus_read_byte_data(data->client, reg);
	u8 reg_val = (ret & ~mask) | (val << (ffs(mask) - 1));

	if (ret < 0)
		return ret;

	return i2c_smbus_write_byte_data(data->client, reg, reg_val);
}

static int bma180_reset_intr(struct bma180_data *data)
{
	int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_RESET_INT, 1);

	if (ret)
		dev_err(&data->client->dev, "failed to reset interrupt\n");

	return ret;
}

static int bma180_set_new_data_intr_state(struct bma180_data *data, int state)
{
	u8 reg_val = state ? BMA180_NEW_DATA_INT : 0x00;
	int ret = i2c_smbus_write_byte_data(data->client, BMA180_CTRL_REG3,
			reg_val);

	if (ret)
		goto err;
	ret = bma180_reset_intr(data);
	if (ret)
		goto err;

	return 0;

err:
	dev_err(&data->client->dev,
		"failed to set new data interrupt state %d\n", state);
	return ret;
}

static int bma180_set_sleep_state(struct bma180_data *data, int state)
{
	int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_SLEEP, state);

	if (ret) {
		dev_err(&data->client->dev,
			"failed to set sleep state %d\n", state);
		return ret;
	}
	data->sleep_state = state;

	return 0;
}

static int bma180_set_ee_writing_state(struct bma180_data *data, int state)
{
	int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_EE_W, state);

	if (ret)
		dev_err(&data->client->dev,
			"failed to set ee writing state %d\n", state);

	return ret;
}

static int bma180_set_bw(struct bma180_data *data, int val)
{
	int ret, i;

	if (data->sleep_state)
		return -EBUSY;

	for (i = 0; i < ARRAY_SIZE(bw_table); ++i) {
		if (bw_table[i] == val) {
			ret = bma180_set_bits(data,
					BMA180_BW_TCS, BMA180_BW, i);
			if (ret) {
				dev_err(&data->client->dev,
					"failed to set bandwidth\n");
				return ret;
			}
			data->bw = val;
			return 0;
		}
	}

	return -EINVAL;
}

static int bma180_set_scale(struct bma180_data *data, int val)
{
	int ret, i;

	if (data->sleep_state)
		return -EBUSY;

	for (i = 0; i < ARRAY_SIZE(scale_table); ++i)
		if (scale_table[i] == val) {
			ret = bma180_set_bits(data,
					BMA180_OFFSET_LSB1, BMA180_RANGE, i);
			if (ret) {
				dev_err(&data->client->dev,
					"failed to set scale\n");
				return ret;
			}
			data->scale = val;
			return 0;
		}

	return -EINVAL;
}

static int bma180_set_pmode(struct bma180_data *data, int mode)
{
	u8 reg_val = mode ? BMA180_LOW_POWER : BMA180_LOW_NOISE;
	int ret = bma180_set_bits(data, BMA180_TCO_Z, BMA180_MODE_CONFIG,
			reg_val);

	if (ret) {
		dev_err(&data->client->dev, "failed to set power mode\n");
		return ret;
	}
	data->pmode = mode;

	return 0;
}

static int bma180_soft_reset(struct bma180_data *data)
{
	int ret = i2c_smbus_write_byte_data(data->client,
			BMA180_RESET, BMA180_RESET_VAL);

	if (ret)
		dev_err(&data->client->dev, "failed to reset the chip\n");

	return ret;
}

static int bma180_chip_init(struct bma180_data *data)
{
	/* Try to read chip_id register. It must return 0x03. */
	int ret = i2c_smbus_read_byte_data(data->client, BMA180_CHIP_ID);

	if (ret < 0)
		goto err;
	if (ret != BMA_180_ID_REG_VAL) {
		ret = -ENODEV;
		goto err;
	}

	ret = bma180_soft_reset(data);
	if (ret)
		goto err;
	/*
	 * No serial transaction should occur within minimum 10 us
	 * after soft_reset command
	 */
	msleep(20);

	ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_DIS_WAKE_UP, 1);
	if (ret)
		goto err;
	ret = bma180_set_ee_writing_state(data, 1);
	if (ret)
		goto err;
	ret = bma180_set_new_data_intr_state(data, 0);
	if (ret)
		goto err;
	ret = bma180_set_bits(data, BMA180_OFFSET_LSB1, BMA180_SMP_SKIP, 1);
	if (ret)
		goto err;
	ret = bma180_set_pmode(data, BMA180_DEF_PMODE);
	if (ret)
		goto err;
	ret = bma180_set_bw(data, BMA180_DEF_BW);
	if (ret)
		goto err;
	ret = bma180_set_scale(data, BMA180_DEF_SCALE);
	if (ret)
		goto err;

	return 0;

err:
	dev_err(&data->client->dev, "failed to init the chip\n");
	return ret;
}

static void bma180_chip_disable(struct bma180_data *data)
{
	if (bma180_set_new_data_intr_state(data, 0))
		goto err;
	if (bma180_set_ee_writing_state(data, 0))
		goto err;
	if (bma180_set_sleep_state(data, 1))
		goto err;

	return;

err:
	dev_err(&data->client->dev, "failed to disable the chip\n");
}

static IIO_CONST_ATTR(in_accel_filter_low_pass_3db_frequency_available,
		BMA180_FLP_FREQ_AVAILABLE);
static IIO_CONST_ATTR(in_accel_scale_available, BMA180_SCALE_AVAILABLE);

static struct attribute *bma180_attributes[] = {
	&iio_const_attr_in_accel_filter_low_pass_3db_frequency_available.dev_attr.attr,
	&iio_const_attr_in_accel_scale_available.dev_attr.attr,
	NULL,
};

static const struct attribute_group bma180_attrs_group = {
	.attrs = bma180_attributes,
};

static int bma180_read_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const *chan, int *val, int *val2,
		long mask)
{
	struct bma180_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
			ret = bma180_get_acc_reg(data, chan->scan_index);
		mutex_unlock(&data->mutex);
		if (ret < 0)
			return ret;
		*val = (s16)ret >> chan->scan_type.shift;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
		*val = data->bw;
		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		*val = 0;
		*val2 = data->scale;
		return IIO_VAL_INT_PLUS_MICRO;
	default:
		return -EINVAL;
	}
}

static int bma180_write_raw(struct iio_dev *indio_dev,
		struct iio_chan_spec const *chan, int val, int val2, long mask)
{
	struct bma180_data *data = iio_priv(indio_dev);
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_SCALE:
		if (val)
			return -EINVAL;
		mutex_lock(&data->mutex);
		ret = bma180_set_scale(data, val2);
		mutex_unlock(&data->mutex);
		return ret;
	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
		mutex_lock(&data->mutex);
		ret = bma180_set_bw(data, val);
		mutex_unlock(&data->mutex);
		return ret;
	default:
		return -EINVAL;
	}
}

static int bma180_update_scan_mode(struct iio_dev *indio_dev,
		const unsigned long *scan_mask)
{
	struct bma180_data *data = iio_priv(indio_dev);

	if (data->buff)
		devm_kfree(&indio_dev->dev, data->buff);
	data->buff = devm_kzalloc(&indio_dev->dev,
			indio_dev->scan_bytes, GFP_KERNEL);
	if (!data->buff)
		return -ENOMEM;

	return 0;
}

static const struct iio_info bma180_info = {
	.attrs			= &bma180_attrs_group,
	.read_raw		= bma180_read_raw,
	.write_raw		= bma180_write_raw,
	.update_scan_mode	= bma180_update_scan_mode,
	.driver_module		= THIS_MODULE,
};

static const char * const bma180_power_modes[] = {
	BMA180_LOW_NOISE_STR,
	BMA180_LOW_POWER_STR,
};

static int bma180_get_power_mode(struct iio_dev *indio_dev,
		const struct iio_chan_spec *chan)
{
	struct bma180_data *data = iio_priv(indio_dev);

	return data->pmode;
}

static int bma180_set_power_mode(struct iio_dev *indio_dev,
		const struct iio_chan_spec *chan, unsigned int mode)
{
	struct bma180_data *data = iio_priv(indio_dev);
	int ret;

	mutex_lock(&data->mutex);
	ret = bma180_set_pmode(data, mode);
	mutex_unlock(&data->mutex);

	return ret;
}

static const struct iio_enum bma180_power_mode_enum = {
	.items = bma180_power_modes,
	.num_items = ARRAY_SIZE(bma180_power_modes),
	.get = bma180_get_power_mode,
	.set = bma180_set_power_mode,
};

static const struct iio_chan_spec_ext_info bma180_ext_info[] = {
	IIO_ENUM("power_mode", true, &bma180_power_mode_enum),
	IIO_ENUM_AVAILABLE("power_mode", &bma180_power_mode_enum),
	{ },
};

#define BMA180_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_LOW_PASS_FILTER_3DB_FREQUENCY),	\
	.scan_index = AXIS_##_axis,					\
	.scan_type = {							\
		.sign = 's',						\
		.realbits = 14,						\
		.storagebits = 16,					\
		.shift = 2,						\
	},								\
	.ext_info = bma180_ext_info,					\
}

static const struct iio_chan_spec bma180_channels[] = {
	BMA180_CHANNEL(X),
	BMA180_CHANNEL(Y),
	BMA180_CHANNEL(Z),
	IIO_CHAN_SOFT_TIMESTAMP(3),
};

static irqreturn_t bma180_trigger_handler(int irq, void *p)
{
	struct iio_poll_func *pf = p;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct bma180_data *data = iio_priv(indio_dev);
	int64_t time_ns = iio_get_time_ns();
	int bit, ret, i = 0;

	mutex_lock(&data->mutex);

	for_each_set_bit(bit, indio_dev->buffer->scan_mask,
			 indio_dev->masklength) {
		ret = bma180_get_acc_reg(data, bit);
		if (ret < 0) {
			mutex_unlock(&data->mutex);
			goto err;
		}
		((s16 *)data->buff)[i++] = ret;
	}
	mutex_unlock(&data->mutex);

	iio_push_to_buffers_with_timestamp(indio_dev, data->buff, time_ns);
err:
	iio_trigger_notify_done(indio_dev->trig);

	return IRQ_HANDLED;
}

static int bma180_data_rdy_trigger_set_state(struct iio_trigger *trig,
		bool state)
{
	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
	struct bma180_data *data = iio_priv(indio_dev);

	return bma180_set_new_data_intr_state(data, state);
}

static int bma180_trig_try_reen(struct iio_trigger *trig)
{
	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
	struct bma180_data *data = iio_priv(indio_dev);

	return bma180_reset_intr(data);
}

static const struct iio_trigger_ops bma180_trigger_ops = {
	.set_trigger_state = bma180_data_rdy_trigger_set_state,
	.try_reenable = bma180_trig_try_reen,
	.owner = THIS_MODULE,
};

static int bma180_probe(struct i2c_client *client,
		const struct i2c_device_id *id)
{
	struct bma180_data *data;
	struct iio_dev *indio_dev;
	struct iio_trigger *trig;
	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;

	ret = bma180_chip_init(data);
	if (ret < 0)
		goto err_chip_disable;

	mutex_init(&data->mutex);

	indio_dev->dev.parent = &client->dev;
	indio_dev->channels = bma180_channels;
	indio_dev->num_channels = ARRAY_SIZE(bma180_channels);
	indio_dev->name = BMA180_DRV_NAME;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->info = &bma180_info;

	trig = iio_trigger_alloc("%s-dev%d", indio_dev->name, indio_dev->id);
	if (!trig) {
		ret = -ENOMEM;
		goto err_chip_disable;
	}

	ret = devm_request_irq(&client->dev, client->irq,
			iio_trigger_generic_data_rdy_poll,
			IRQF_TRIGGER_RISING, BMA180_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 = &bma180_trigger_ops;
	iio_trigger_set_drvdata(trig, indio_dev);
	data->trig = trig;
	indio_dev->trig = trig;

	ret = iio_trigger_register(trig);
	if (ret)
		goto err_trigger_free;

	ret = iio_triggered_buffer_setup(indio_dev, NULL,
			bma180_trigger_handler, NULL);
	if (ret < 0) {
		dev_err(&client->dev, "unable to setup iio triggered buffer\n");
		goto err_trigger_unregister;
	}

	ret = iio_device_register(indio_dev);
	if (ret < 0) {
		dev_err(&client->dev, "unable to register iio device\n");
		goto err_buffer_cleanup;
	}

	return 0;

err_buffer_cleanup:
	iio_triggered_buffer_cleanup(indio_dev);
err_trigger_unregister:
	iio_trigger_unregister(trig);
err_trigger_free:
	iio_trigger_free(trig);
err_chip_disable:
	bma180_chip_disable(data);

	return ret;
}

static int bma180_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);
	struct bma180_data *data = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);
	iio_triggered_buffer_cleanup(indio_dev);
	iio_trigger_unregister(data->trig);
	iio_trigger_free(data->trig);

	mutex_lock(&data->mutex);
	bma180_chip_disable(data);
	mutex_unlock(&data->mutex);

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int bma180_suspend(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	struct bma180_data *data = iio_priv(indio_dev);
	int ret;

	mutex_lock(&data->mutex);
	ret = bma180_set_sleep_state(data, 1);
	mutex_unlock(&data->mutex);

	return ret;
}

static int bma180_resume(struct device *dev)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
	struct bma180_data *data = iio_priv(indio_dev);
	int ret;

	mutex_lock(&data->mutex);
	ret = bma180_set_sleep_state(data, 0);
	mutex_unlock(&data->mutex);

	return ret;
}

static SIMPLE_DEV_PM_OPS(bma180_pm_ops, bma180_suspend, bma180_resume);
#define BMA180_PM_OPS (&bma180_pm_ops)
#else
#define BMA180_PM_OPS NULL
#endif

static struct i2c_device_id bma180_id[] = {
	{ BMA180_DRV_NAME, 0 },
	{ }
};

MODULE_DEVICE_TABLE(i2c, bma180_id);

static struct i2c_driver bma180_driver = {
	.driver = {
		.name	= BMA180_DRV_NAME,
		.owner	= THIS_MODULE,
		.pm	= BMA180_PM_OPS,
	},
	.probe		= bma180_probe,
	.remove		= bma180_remove,
	.id_table	= bma180_id,
};

module_i2c_driver(bma180_driver);

MODULE_AUTHOR("Kravchenko Oleksandr <x0199363@ti.com>");
MODULE_AUTHOR("Texas Instruments, Inc.");
MODULE_DESCRIPTION("Bosch BMA180 triaxial acceleration sensor");
MODULE_LICENSE("GPL");
Commit	Line	Data
fdadbce0 OK	1	/*
	2	* bma180.c - IIO driver for Bosch BMA180 triaxial acceleration sensor
	3	*
	4	* Copyright 2013 Oleksandr Kravchenko <x0199363@ti.com>
	5	*
	6	* This file is subject to the terms and conditions of version 2 of
	7	* the GNU General Public License. See the file COPYING in the main
	8	* directory of this archive for more details.
	9	*/
	10
	11	#include <linux/module.h>
	12	#include <linux/i2c.h>
	13	#include <linux/interrupt.h>
	14	#include <linux/delay.h>
	15	#include <linux/of.h>
	16	#include <linux/bitops.h>
	17	#include <linux/slab.h>
	18	#include <linux/string.h>
	19	#include <linux/iio/iio.h>
	20	#include <linux/iio/sysfs.h>
	21	#include <linux/iio/buffer.h>
	22	#include <linux/iio/trigger.h>
	23	#include <linux/iio/trigger_consumer.h>
	24	#include <linux/iio/triggered_buffer.h>
	25
	26	#define BMA180_DRV_NAME "bma180"
	27	#define BMA180_IRQ_NAME "bma180_event"
	28
	29	/* Register set */
	30	#define BMA180_CHIP_ID 0x00 /* Need to distinguish BMA180 from other */
	31	#define BMA180_ACC_X_LSB 0x02 /* First of 6 registers of accel data */
	32	#define BMA180_CTRL_REG0 0x0d
	33	#define BMA180_RESET 0x10
	34	#define BMA180_BW_TCS 0x20
	35	#define BMA180_CTRL_REG3 0x21
	36	#define BMA180_TCO_Z 0x30
	37	#define BMA180_OFFSET_LSB1 0x35
	38
	39	/* BMA180_CTRL_REG0 bits */
	40	#define BMA180_DIS_WAKE_UP BIT(0) /* Disable wake up mode */
	41	#define BMA180_SLEEP BIT(1) /* 1 - chip will sleep */
	42	#define BMA180_EE_W BIT(4) /* Unlock writing to addr from 0x20 */
	43	#define BMA180_RESET_INT BIT(6) /* Reset pending interrupts */
	44
	45	/* BMA180_CTRL_REG3 bits */
	46	#define BMA180_NEW_DATA_INT BIT(1) /* Intr every new accel data is ready */
	47
	48	/* BMA180_OFFSET_LSB1 skipping mode bit */
	49	#define BMA180_SMP_SKIP BIT(0)
	50
	51	/* Bit masks for registers bit fields */
	52	#define BMA180_RANGE 0x0e /* Range of measured accel values*/
	53	#define BMA180_BW 0xf0 /* Accel bandwidth */
	54	#define BMA180_MODE_CONFIG 0x03 /* Config operation modes */
	55
	56	/* We have to write this value in reset register to do soft reset */
	57	#define BMA180_RESET_VAL 0xb6
	58
	59	#define BMA_180_ID_REG_VAL 0x03
	60
	61	/* Chip power modes */
	62	#define BMA180_LOW_NOISE 0x00
	63	#define BMA180_LOW_POWER 0x03
	64
65	#define BMA180_LOW_NOISE_STR "low_noise"
66	#define BMA180_LOW_POWER_STR "low_power"
67
68	/* Defaults values */
69	#define BMA180_DEF_PMODE 0
70	#define BMA180_DEF_BW 20
381676d5	71	#define BMA180_DEF_SCALE 2452
fdadbce0 OK	72
	73	/* Available values for sysfs */
	74	#define BMA180_FLP_FREQ_AVAILABLE \
	75	"10 20 40 75 150 300"
	76	#define BMA180_SCALE_AVAILABLE \
381676d5	77	"0.001275 0.001863 0.002452 0.003727 0.004903 0.009709 0.019417"
fdadbce0 OK	78
	79	struct bma180_data {
	80	struct i2c_client *client;
	81	struct iio_trigger *trig;
	82	struct mutex mutex;
	83	int sleep_state;
	84	int scale;
	85	int bw;
	86	int pmode;
	87	char *buff;
	88	};
	89
	90	enum bma180_axis {
	91	AXIS_X,
	92	AXIS_Y,
	93	AXIS_Z,
	94	};
	95
	96	static int bw_table[] = { 10, 20, 40, 75, 150, 300 }; /* Hz */
381676d5	97	static int scale_table[] = { 1275, 1863, 2452, 3727, 4903, 9709, 19417 };
fdadbce0 OK	98
	99	static int bma180_get_acc_reg(struct bma180_data *data, enum bma180_axis axis)
	100	{
	101	u8 reg = BMA180_ACC_X_LSB + axis * 2;
	102	int ret;
	103
	104	if (data->sleep_state)
	105	return -EBUSY;
	106
	107	ret = i2c_smbus_read_word_data(data->client, reg);
	108	if (ret < 0)
	109	dev_err(&data->client->dev,
	110	"failed to read accel_%c registers\n", 'x' + axis);
	111
	112	return ret;
	113	}
	114
	115	static int bma180_set_bits(struct bma180_data *data, u8 reg, u8 mask, u8 val)
	116	{
	117	int ret = i2c_smbus_read_byte_data(data->client, reg);
	118	u8 reg_val = (ret & ~mask) \| (val << (ffs(mask) - 1));
	119
	120	if (ret < 0)
	121	return ret;
	122
	123	return i2c_smbus_write_byte_data(data->client, reg, reg_val);
	124	}
	125
	126	static int bma180_reset_intr(struct bma180_data *data)
	127	{
	128	int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_RESET_INT, 1);
	129
	130	if (ret)
	131	dev_err(&data->client->dev, "failed to reset interrupt\n");
	132
	133	return ret;
	134	}
	135
	136	static int bma180_set_new_data_intr_state(struct bma180_data *data, int state)
	137	{
	138	u8 reg_val = state ? BMA180_NEW_DATA_INT : 0x00;
	139	int ret = i2c_smbus_write_byte_data(data->client, BMA180_CTRL_REG3,
	140	reg_val);
	141
	142	if (ret)
	143	goto err;
	144	ret = bma180_reset_intr(data);
	145	if (ret)
	146	goto err;
	147
	148	return 0;
	149
	150	err:
	151	dev_err(&data->client->dev,
	152	"failed to set new data interrupt state %d\n", state);
	153	return ret;
	154	}
	155
	156	static int bma180_set_sleep_state(struct bma180_data *data, int state)
	157	{
	158	int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_SLEEP, state);
	159
	160	if (ret) {
	161	dev_err(&data->client->dev,
162	"failed to set sleep state %d\n", state);
163	return ret;
164	}
165	data->sleep_state = state;
166
167	return 0;
168	}
169
170	static int bma180_set_ee_writing_state(struct bma180_data *data, int state)
171	{
172	int ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_EE_W, state);
173
174	if (ret)
175	dev_err(&data->client->dev,
176	"failed to set ee writing state %d\n", state);
177
178	return ret;
179	}
180
181	static int bma180_set_bw(struct bma180_data *data, int val)
182	{
183	int ret, i;
184
185	if (data->sleep_state)
186	return -EBUSY;
187
188	for (i = 0; i < ARRAY_SIZE(bw_table); ++i) {
189	if (bw_table[i] == val) {
190	ret = bma180_set_bits(data,
191	BMA180_BW_TCS, BMA180_BW, i);
192	if (ret) {
193	dev_err(&data->client->dev,
194	"failed to set bandwidth\n");
195	return ret;
196	}
197	data->bw = val;
198	return 0;
199	}
200	}
201
202	return -EINVAL;
203	}
204
205	static int bma180_set_scale(struct bma180_data *data, int val)
206	{
207	int ret, i;
208
209	if (data->sleep_state)
210	return -EBUSY;
211
212	for (i = 0; i < ARRAY_SIZE(scale_table); ++i)
213	if (scale_table[i] == val) {
214	ret = bma180_set_bits(data,
215	BMA180_OFFSET_LSB1, BMA180_RANGE, i);
216	if (ret) {
217	dev_err(&data->client->dev,
218	"failed to set scale\n");
219	return ret;
220	}
221	data->scale = val;
222	return 0;
223	}
224
225	return -EINVAL;
226	}
227
228	static int bma180_set_pmode(struct bma180_data *data, int mode)
229	{
230	u8 reg_val = mode ? BMA180_LOW_POWER : BMA180_LOW_NOISE;
231	int ret = bma180_set_bits(data, BMA180_TCO_Z, BMA180_MODE_CONFIG,
232	reg_val);
233
234	if (ret) {
235	dev_err(&data->client->dev, "failed to set power mode\n");
236	return ret;
237	}
238	data->pmode = mode;
239
240	return 0;
241	}
242
243	static int bma180_soft_reset(struct bma180_data *data)
244	{
245	int ret = i2c_smbus_write_byte_data(data->client,
246	BMA180_RESET, BMA180_RESET_VAL);
247
248	if (ret)
249	dev_err(&data->client->dev, "failed to reset the chip\n");
250
251	return ret;
252	}
253
254	static int bma180_chip_init(struct bma180_data *data)
255	{
256	/* Try to read chip_id register. It must return 0x03. */
257	int ret = i2c_smbus_read_byte_data(data->client, BMA180_CHIP_ID);
258
259	if (ret < 0)
260	goto err;
261	if (ret != BMA_180_ID_REG_VAL) {
262	ret = -ENODEV;
263	goto err;
264	}
265
266	ret = bma180_soft_reset(data);
267	if (ret)
268	goto err;
269	/*
270	* No serial transaction should occur within minimum 10 us
271	* after soft_reset command
272	*/
273	msleep(20);
274
275	ret = bma180_set_bits(data, BMA180_CTRL_REG0, BMA180_DIS_WAKE_UP, 1);
276	if (ret)
277	goto err;
278	ret = bma180_set_ee_writing_state(data, 1);
279	if (ret)
280	goto err;
281	ret = bma180_set_new_data_intr_state(data, 0);
282	if (ret)
283	goto err;
284	ret = bma180_set_bits(data, BMA180_OFFSET_LSB1, BMA180_SMP_SKIP, 1);
285	if (ret)
286	goto err;
287	ret = bma180_set_pmode(data, BMA180_DEF_PMODE);
288	if (ret)
289	goto err;
290	ret = bma180_set_bw(data, BMA180_DEF_BW);
291	if (ret)
292	goto err;
293	ret = bma180_set_scale(data, BMA180_DEF_SCALE);
294	if (ret)
295	goto err;
296
297	return 0;
298
299	err:
300	dev_err(&data->client->dev, "failed to init the chip\n");
301	return ret;
302	}
303
304	static void bma180_chip_disable(struct bma180_data *data)
305	{
306	if (bma180_set_new_data_intr_state(data, 0))
307	goto err;
308	if (bma180_set_ee_writing_state(data, 0))
309	goto err;
310	if (bma180_set_sleep_state(data, 1))
311	goto err;
312
313	return;
314
315	err:
316	dev_err(&data->client->dev, "failed to disable the chip\n");
317	}
318
319	static IIO_CONST_ATTR(in_accel_filter_low_pass_3db_frequency_available,
320	BMA180_FLP_FREQ_AVAILABLE);
321	static IIO_CONST_ATTR(in_accel_scale_available, BMA180_SCALE_AVAILABLE);
322
323	static struct attribute *bma180_attributes[] = {
324	&iio_const_attr_in_accel_filter_low_pass_3db_frequency_available.dev_attr.attr,
325	&iio_const_attr_in_accel_scale_available.dev_attr.attr,
326	NULL,
327	};
328
329	static const struct attribute_group bma180_attrs_group = {
330	.attrs = bma180_attributes,
331	};
332
333	static int bma180_read_raw(struct iio_dev *indio_dev,
334	struct iio_chan_spec const chan, int val, int *val2,
335	long mask)
336	{
337	struct bma180_data *data = iio_priv(indio_dev);
338	int ret;
339
340	switch (mask) {
341	case IIO_CHAN_INFO_RAW:
342	mutex_lock(&data->mutex);
343	if (iio_buffer_enabled(indio_dev))
344	ret = -EBUSY;
345	else
346	ret = bma180_get_acc_reg(data, chan->scan_index);
347	mutex_unlock(&data->mutex);
348	if (ret < 0)
349	return ret;
350	*val = (s16)ret >> chan->scan_type.shift;
351	return IIO_VAL_INT;
352	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
353	*val = data->bw;
354	return IIO_VAL_INT;
355	case IIO_CHAN_INFO_SCALE:
356	*val = 0;
357	*val2 = data->scale;
358	return IIO_VAL_INT_PLUS_MICRO;
359	default:
360	return -EINVAL;
361	}
362	}
363
364	static int bma180_write_raw(struct iio_dev *indio_dev,
365	struct iio_chan_spec const *chan, int val, int val2, long mask)
366	{
367	struct bma180_data *data = iio_priv(indio_dev);
368	int ret;
369
370	switch (mask) {
371	case IIO_CHAN_INFO_SCALE:
372	if (val)
373	return -EINVAL;
374	mutex_lock(&data->mutex);
375	ret = bma180_set_scale(data, val2);
376	mutex_unlock(&data->mutex);
377	return ret;
378	case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
379	mutex_lock(&data->mutex);
380	ret = bma180_set_bw(data, val);
381	mutex_unlock(&data->mutex);
382	return ret;
383	default:
384	return -EINVAL;
385	}
386	}
387
388	static int bma180_update_scan_mode(struct iio_dev *indio_dev,
389	const unsigned long *scan_mask)
390	{
391	struct bma180_data *data = iio_priv(indio_dev);
392
393	if (data->buff)
394	devm_kfree(&indio_dev->dev, data->buff);
395	data->buff = devm_kzalloc(&indio_dev->dev,
396	indio_dev->scan_bytes, GFP_KERNEL);
397	if (!data->buff)
398	return -ENOMEM;
399
400	return 0;
401	}
402
403	static const struct iio_info bma180_info = {
404	.attrs = &bma180_attrs_group,
405	.read_raw = bma180_read_raw,
406	.write_raw = bma180_write_raw,
407	.update_scan_mode = bma180_update_scan_mode,
408	.driver_module = THIS_MODULE,
409	};
410
411	static const char * const bma180_power_modes[] = {
412	BMA180_LOW_NOISE_STR,
413	BMA180_LOW_POWER_STR,
414	};
415
416	static int bma180_get_power_mode(struct iio_dev *indio_dev,
417	const struct iio_chan_spec *chan)
418	{
419	struct bma180_data *data = iio_priv(indio_dev);
420
421	return data->pmode;
422	}
423
424	static int bma180_set_power_mode(struct iio_dev *indio_dev,
425	const struct iio_chan_spec *chan, unsigned int mode)
426	{
427	struct bma180_data *data = iio_priv(indio_dev);
428	int ret;
429
430	mutex_lock(&data->mutex);
431	ret = bma180_set_pmode(data, mode);
432	mutex_unlock(&data->mutex);
433
434	return ret;
435	}
436
437	static const struct iio_enum bma180_power_mode_enum = {
438	.items = bma180_power_modes,
439	.num_items = ARRAY_SIZE(bma180_power_modes),
440	.get = bma180_get_power_mode,
441	.set = bma180_set_power_mode,
442	};
443
444	static const struct iio_chan_spec_ext_info bma180_ext_info[] = {
445	IIO_ENUM("power_mode", true, &bma180_power_mode_enum),
446	IIO_ENUM_AVAILABLE("power_mode", &bma180_power_mode_enum),
447	{ },
448	};
449
5585215b	450	#define BMA180_CHANNEL(_axis) { \
fdadbce0	451	.type = IIO_ACCEL, \
5585215b PM	452	.modified = 1, \
5585215b PM	453	.channel2 = IIO_MOD_##_axis, \
5c1449d4 PM	454	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
5c1449d4 PM	455	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) \| \
fdadbce0	456	BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \
5585215b	457	.scan_index = AXIS_##_axis, \
7d7feae7 JC	458	.scan_type = { \
	459	.sign = 's', \
	460	.realbits = 14, \
	461	.storagebits = 16, \
	462	.shift = 2, \
	463	}, \
fdadbce0 OK	464	.ext_info = bma180_ext_info, \
	465	}
	466
	467	static const struct iio_chan_spec bma180_channels[] = {
5585215b PM	468	BMA180_CHANNEL(X),
	469	BMA180_CHANNEL(Y),
	470	BMA180_CHANNEL(Z),
	471	IIO_CHAN_SOFT_TIMESTAMP(3),
fdadbce0 OK	472	};
	473
	474	static irqreturn_t bma180_trigger_handler(int irq, void *p)
	475	{
	476	struct iio_poll_func *pf = p;
	477	struct iio_dev *indio_dev = pf->indio_dev;
	478	struct bma180_data *data = iio_priv(indio_dev);
6bf9d877	479	int64_t time_ns = iio_get_time_ns();
fdadbce0 OK	480	int bit, ret, i = 0;
	481
	482	mutex_lock(&data->mutex);
fdadbce0 OK	483
	484	for_each_set_bit(bit, indio_dev->buffer->scan_mask,
	485	indio_dev->masklength) {
	486	ret = bma180_get_acc_reg(data, bit);
	487	if (ret < 0) {
	488	mutex_unlock(&data->mutex);
	489	goto err;
	490	}
	491	((s16 *)data->buff)[i++] = ret;
	492	}
	493	mutex_unlock(&data->mutex);
	494
6bf9d877	495	iio_push_to_buffers_with_timestamp(indio_dev, data->buff, time_ns);
fdadbce0 OK	496	err:
	497	iio_trigger_notify_done(indio_dev->trig);
	498
	499	return IRQ_HANDLED;
	500	}
	501
	502	static int bma180_data_rdy_trigger_set_state(struct iio_trigger *trig,
	503	bool state)
	504	{
	505	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
	506	struct bma180_data *data = iio_priv(indio_dev);
	507
	508	return bma180_set_new_data_intr_state(data, state);
	509	}
	510
	511	static int bma180_trig_try_reen(struct iio_trigger *trig)
	512	{
	513	struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
	514	struct bma180_data *data = iio_priv(indio_dev);
	515
	516	return bma180_reset_intr(data);
	517	}
	518
	519	static const struct iio_trigger_ops bma180_trigger_ops = {
	520	.set_trigger_state = bma180_data_rdy_trigger_set_state,
	521	.try_reenable = bma180_trig_try_reen,
	522	.owner = THIS_MODULE,
	523	};
	524
	525	static int bma180_probe(struct i2c_client *client,
	526	const struct i2c_device_id *id)
	527	{
	528	struct bma180_data *data;
	529	struct iio_dev *indio_dev;
	530	struct iio_trigger *trig;
	531	int ret;
	532
	533	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	534	if (!indio_dev)
	535	return -ENOMEM;
	536
	537	data = iio_priv(indio_dev);
	538	i2c_set_clientdata(client, indio_dev);
	539	data->client = client;
	540
	541	ret = bma180_chip_init(data);
	542	if (ret < 0)
	543	goto err_chip_disable;
	544
	545	mutex_init(&data->mutex);
	546
	547	indio_dev->dev.parent = &client->dev;
	548	indio_dev->channels = bma180_channels;
	549	indio_dev->num_channels = ARRAY_SIZE(bma180_channels);
	550	indio_dev->name = BMA180_DRV_NAME;
	551	indio_dev->modes = INDIO_DIRECT_MODE;
	552	indio_dev->info = &bma180_info;
	553
	554	trig = iio_trigger_alloc("%s-dev%d", indio_dev->name, indio_dev->id);
	555	if (!trig) {
	556	ret = -ENOMEM;
	557	goto err_chip_disable;
	558	}
	559
560	ret = devm_request_irq(&client->dev, client->irq,
561	iio_trigger_generic_data_rdy_poll,
562	IRQF_TRIGGER_RISING, BMA180_IRQ_NAME, trig);
563	if (ret) {
564	dev_err(&client->dev, "unable to request IRQ\n");
565	goto err_trigger_free;
566	}
567
568	trig->dev.parent = &client->dev;
569	trig->ops = &bma180_trigger_ops;
570	iio_trigger_set_drvdata(trig, indio_dev);
571	data->trig = trig;
572	indio_dev->trig = trig;
573
574	ret = iio_trigger_register(trig);
575	if (ret)
576	goto err_trigger_free;
577
578	ret = iio_triggered_buffer_setup(indio_dev, NULL,
579	bma180_trigger_handler, NULL);
580	if (ret < 0) {
581	dev_err(&client->dev, "unable to setup iio triggered buffer\n");
582	goto err_trigger_unregister;
583	}
584
585	ret = iio_device_register(indio_dev);
586	if (ret < 0) {
587	dev_err(&client->dev, "unable to register iio device\n");
588	goto err_buffer_cleanup;
589	}
590
591	return 0;
592
593	err_buffer_cleanup:
594	iio_triggered_buffer_cleanup(indio_dev);
595	err_trigger_unregister:
596	iio_trigger_unregister(trig);
597	err_trigger_free:
598	iio_trigger_free(trig);
599	err_chip_disable:
600	bma180_chip_disable(data);
601
602	return ret;
603	}
604
605	static int bma180_remove(struct i2c_client *client)
606	{
607	struct iio_dev *indio_dev = i2c_get_clientdata(client);
608	struct bma180_data *data = iio_priv(indio_dev);
609
610	iio_device_unregister(indio_dev);
611	iio_triggered_buffer_cleanup(indio_dev);
612	iio_trigger_unregister(data->trig);
613	iio_trigger_free(data->trig);
614
615	mutex_lock(&data->mutex);
616	bma180_chip_disable(data);
617	mutex_unlock(&data->mutex);
618
619	return 0;
620	}
621
622	#ifdef CONFIG_PM_SLEEP
623	static int bma180_suspend(struct device *dev)
624	{
234efa17	625	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
fdadbce0 OK	626	struct bma180_data *data = iio_priv(indio_dev);
	627	int ret;
	628
	629	mutex_lock(&data->mutex);
	630	ret = bma180_set_sleep_state(data, 1);
	631	mutex_unlock(&data->mutex);
	632
	633	return ret;
	634	}
	635
	636	static int bma180_resume(struct device *dev)
	637	{
234efa17	638	struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
fdadbce0 OK	639	struct bma180_data *data = iio_priv(indio_dev);
	640	int ret;
	641
	642	mutex_lock(&data->mutex);
	643	ret = bma180_set_sleep_state(data, 0);
	644	mutex_unlock(&data->mutex);
	645
	646	return ret;
	647	}
	648
	649	static SIMPLE_DEV_PM_OPS(bma180_pm_ops, bma180_suspend, bma180_resume);
	650	#define BMA180_PM_OPS (&bma180_pm_ops)
	651	#else
	652	#define BMA180_PM_OPS NULL
	653	#endif
	654
	655	static struct i2c_device_id bma180_id[] = {
	656	{ BMA180_DRV_NAME, 0 },
	657	{ }
	658	};
	659
	660	MODULE_DEVICE_TABLE(i2c, bma180_id);
	661
	662	static struct i2c_driver bma180_driver = {
	663	.driver = {
	664	.name = BMA180_DRV_NAME,
	665	.owner = THIS_MODULE,
	666	.pm = BMA180_PM_OPS,
	667	},
	668	.probe = bma180_probe,
	669	.remove = bma180_remove,
	670	.id_table = bma180_id,
	671	};
	672
	673	module_i2c_driver(bma180_driver);
	674
	675	MODULE_AUTHOR("Kravchenko Oleksandr <x0199363@ti.com>");
	676	MODULE_AUTHOR("Texas Instruments, Inc.");
	677	MODULE_DESCRIPTION("Bosch BMA180 triaxial acceleration sensor");
	678	MODULE_LICENSE("GPL");