[mirror_ubuntu-hirsute-kernel.git] / drivers / iio / pressure / mpl3115.c

/*
 * mpl3115.c - Support for Freescale MPL3115A2 pressure/temperature sensor
 *
 * Copyright (c) 2013 Peter Meerwald <pmeerw@pmeerw.net>
 *
 * 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.
 *
 * (7-bit I2C slave address 0x60)
 *
 * TODO: FIFO buffer, altimeter mode, oversampling, continuous mode,
 * interrupts, user offset correction, raw mode
 */

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

#define MPL3115_STATUS 0x00
#define MPL3115_OUT_PRESS 0x01 /* MSB first, 20 bit */
#define MPL3115_OUT_TEMP 0x04 /* MSB first, 12 bit */
#define MPL3115_WHO_AM_I 0x0c
#define MPL3115_CTRL_REG1 0x26

#define MPL3115_DEVICE_ID 0xc4

#define MPL3115_STATUS_PRESS_RDY BIT(2)
#define MPL3115_STATUS_TEMP_RDY BIT(1)

#define MPL3115_CTRL_RESET BIT(2) /* software reset */
#define MPL3115_CTRL_OST BIT(1) /* initiate measurement */
#define MPL3115_CTRL_ACTIVE BIT(0) /* continuous measurement */
#define MPL3115_CTRL_OS_258MS (BIT(5) | BIT(4)) /* 64x oversampling */

struct mpl3115_data {
	struct i2c_client *client;
	struct mutex lock;
	u8 ctrl_reg1;
};

static int mpl3115_request(struct mpl3115_data *data)
{
	int ret, tries = 15;

	/* trigger measurement */
	ret = i2c_smbus_write_byte_data(data->client, MPL3115_CTRL_REG1,
		data->ctrl_reg1 | MPL3115_CTRL_OST);
	if (ret < 0)
		return ret;

	while (tries-- > 0) {
		ret = i2c_smbus_read_byte_data(data->client, MPL3115_CTRL_REG1);
		if (ret < 0)
			return ret;
		/* wait for data ready, i.e. OST cleared */
		if (!(ret & MPL3115_CTRL_OST))
			break;
		msleep(20);
	}

	if (tries < 0) {
		dev_err(&data->client->dev, "data not ready\n");
		return -EIO;
	}

	return 0;
}

static int mpl3115_read_raw(struct iio_dev *indio_dev,
			    struct iio_chan_spec const *chan,
			    int *val, int *val2, long mask)
{
	struct mpl3115_data *data = iio_priv(indio_dev);
	__be32 tmp = 0;
	int ret;

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		ret = iio_device_claim_direct_mode(indio_dev);
		if (ret)
			return ret;

		switch (chan->type) {
		case IIO_PRESSURE: /* in 0.25 pascal / LSB */
			mutex_lock(&data->lock);
			ret = mpl3115_request(data);
			if (ret < 0) {
				mutex_unlock(&data->lock);
				break;
			}
			ret = i2c_smbus_read_i2c_block_data(data->client,
				MPL3115_OUT_PRESS, 3, (u8 *) &tmp);
			mutex_unlock(&data->lock);
			if (ret < 0)
				break;
			*val = be32_to_cpu(tmp) >> 12;
			ret = IIO_VAL_INT;
			break;
		case IIO_TEMP: /* in 0.0625 celsius / LSB */
			mutex_lock(&data->lock);
			ret = mpl3115_request(data);
			if (ret < 0) {
				mutex_unlock(&data->lock);
				break;
			}
			ret = i2c_smbus_read_i2c_block_data(data->client,
				MPL3115_OUT_TEMP, 2, (u8 *) &tmp);
			mutex_unlock(&data->lock);
			if (ret < 0)
				break;
			*val = sign_extend32(be32_to_cpu(tmp) >> 20, 11);
			ret = IIO_VAL_INT;
			break;
		default:
			ret = -EINVAL;
			break;
		}

		iio_device_release_direct_mode(indio_dev);
		return ret;

	case IIO_CHAN_INFO_SCALE:
		switch (chan->type) {
		case IIO_PRESSURE:
			*val = 0;
			*val2 = 250; /* want kilopascal */
			return IIO_VAL_INT_PLUS_MICRO;
		case IIO_TEMP:
			*val = 0;
			*val2 = 62500;
			return IIO_VAL_INT_PLUS_MICRO;
		default:
			return -EINVAL;
		}
	}
	return -EINVAL;
}

static irqreturn_t mpl3115_trigger_handler(int irq, void *p)
{
	struct iio_poll_func *pf = p;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct mpl3115_data *data = iio_priv(indio_dev);
	u8 buffer[16]; /* 32-bit channel + 16-bit channel + padding + ts */
	int ret, pos = 0;

	mutex_lock(&data->lock);
	ret = mpl3115_request(data);
	if (ret < 0) {
		mutex_unlock(&data->lock);
		goto done;
	}

	memset(buffer, 0, sizeof(buffer));
	if (test_bit(0, indio_dev->active_scan_mask)) {
		ret = i2c_smbus_read_i2c_block_data(data->client,
			MPL3115_OUT_PRESS, 3, &buffer[pos]);
		if (ret < 0) {
			mutex_unlock(&data->lock);
			goto done;
		}
		pos += 4;
	}

	if (test_bit(1, indio_dev->active_scan_mask)) {
		ret = i2c_smbus_read_i2c_block_data(data->client,
			MPL3115_OUT_TEMP, 2, &buffer[pos]);
		if (ret < 0) {
			mutex_unlock(&data->lock);
			goto done;
		}
	}
	mutex_unlock(&data->lock);

	iio_push_to_buffers_with_timestamp(indio_dev, buffer,
		iio_get_time_ns(indio_dev));

done:
	iio_trigger_notify_done(indio_dev->trig);
	return IRQ_HANDLED;
}

static const struct iio_chan_spec mpl3115_channels[] = {
	{
		.type = IIO_PRESSURE,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
		.scan_index = 0,
		.scan_type = {
			.sign = 'u',
			.realbits = 20,
			.storagebits = 32,
			.shift = 12,
			.endianness = IIO_BE,
		}
	},
	{
		.type = IIO_TEMP,
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
		.scan_index = 1,
		.scan_type = {
			.sign = 's',
			.realbits = 12,
			.storagebits = 16,
			.shift = 4,
			.endianness = IIO_BE,
		}
	},
	IIO_CHAN_SOFT_TIMESTAMP(2),
};

static const struct iio_info mpl3115_info = {
	.read_raw = &mpl3115_read_raw,
	.driver_module = THIS_MODULE,
};

static int mpl3115_probe(struct i2c_client *client,
			 const struct i2c_device_id *id)
{
	struct mpl3115_data *data;
	struct iio_dev *indio_dev;
	int ret;

	ret = i2c_smbus_read_byte_data(client, MPL3115_WHO_AM_I);
	if (ret < 0)
		return ret;
	if (ret != MPL3115_DEVICE_ID)
		return -ENODEV;

	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	if (!indio_dev)
		return -ENOMEM;

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

	i2c_set_clientdata(client, indio_dev);
	indio_dev->info = &mpl3115_info;
	indio_dev->name = id->name;
	indio_dev->dev.parent = &client->dev;
	indio_dev->modes = INDIO_DIRECT_MODE;
	indio_dev->channels = mpl3115_channels;
	indio_dev->num_channels = ARRAY_SIZE(mpl3115_channels);

	/* software reset, I2C transfer is aborted (fails) */
	i2c_smbus_write_byte_data(client, MPL3115_CTRL_REG1,
		MPL3115_CTRL_RESET);
	msleep(50);

	data->ctrl_reg1 = MPL3115_CTRL_OS_258MS;
	ret = i2c_smbus_write_byte_data(client, MPL3115_CTRL_REG1,
		data->ctrl_reg1);
	if (ret < 0)
		return ret;

	ret = iio_triggered_buffer_setup(indio_dev, NULL,
		mpl3115_trigger_handler, NULL);
	if (ret < 0)
		return ret;

	ret = iio_device_register(indio_dev);
	if (ret < 0)
		goto buffer_cleanup;
	return 0;

buffer_cleanup:
	iio_triggered_buffer_cleanup(indio_dev);
	return ret;
}

static int mpl3115_standby(struct mpl3115_data *data)
{
	return i2c_smbus_write_byte_data(data->client, MPL3115_CTRL_REG1,
		data->ctrl_reg1 & ~MPL3115_CTRL_ACTIVE);
}

static int mpl3115_remove(struct i2c_client *client)
{
	struct iio_dev *indio_dev = i2c_get_clientdata(client);

	iio_device_unregister(indio_dev);
	iio_triggered_buffer_cleanup(indio_dev);
	mpl3115_standby(iio_priv(indio_dev));

	return 0;
}

#ifdef CONFIG_PM_SLEEP
static int mpl3115_suspend(struct device *dev)
{
	return mpl3115_standby(iio_priv(i2c_get_clientdata(
		to_i2c_client(dev))));
}

static int mpl3115_resume(struct device *dev)
{
	struct mpl3115_data *data = iio_priv(i2c_get_clientdata(
		to_i2c_client(dev)));

	return i2c_smbus_write_byte_data(data->client, MPL3115_CTRL_REG1,
		data->ctrl_reg1);
}

static SIMPLE_DEV_PM_OPS(mpl3115_pm_ops, mpl3115_suspend, mpl3115_resume);
#define MPL3115_PM_OPS (&mpl3115_pm_ops)
#else
#define MPL3115_PM_OPS NULL
#endif

static const struct i2c_device_id mpl3115_id[] = {
	{ "mpl3115", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, mpl3115_id);

static struct i2c_driver mpl3115_driver = {
	.driver = {
		.name	= "mpl3115",
		.pm	= MPL3115_PM_OPS,
	},
	.probe = mpl3115_probe,
	.remove = mpl3115_remove,
	.id_table = mpl3115_id,
};
module_i2c_driver(mpl3115_driver);

MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
MODULE_DESCRIPTION("Freescale MPL3115 pressure/temperature driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
cc26ad45 PM	1	/*
	2	* mpl3115.c - Support for Freescale MPL3115A2 pressure/temperature sensor
	3	*
	4	* Copyright (c) 2013 Peter Meerwald <pmeerw@pmeerw.net>
	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	* (7-bit I2C slave address 0x60)
	11	*
	12	* TODO: FIFO buffer, altimeter mode, oversampling, continuous mode,
	13	* interrupts, user offset correction, raw mode
	14	*/
	15
	16	#include <linux/module.h>
	17	#include <linux/i2c.h>
	18	#include <linux/iio/iio.h>
	19	#include <linux/iio/sysfs.h>
	20	#include <linux/iio/trigger_consumer.h>
	21	#include <linux/iio/buffer.h>
	22	#include <linux/iio/triggered_buffer.h>
	23	#include <linux/delay.h>
	24
	25	#define MPL3115_STATUS 0x00
	26	#define MPL3115_OUT_PRESS 0x01 /* MSB first, 20 bit */
	27	#define MPL3115_OUT_TEMP 0x04 /* MSB first, 12 bit */
	28	#define MPL3115_WHO_AM_I 0x0c
	29	#define MPL3115_CTRL_REG1 0x26
	30
	31	#define MPL3115_DEVICE_ID 0xc4
	32
	33	#define MPL3115_STATUS_PRESS_RDY BIT(2)
	34	#define MPL3115_STATUS_TEMP_RDY BIT(1)
	35
	36	#define MPL3115_CTRL_RESET BIT(2) /* software reset */
	37	#define MPL3115_CTRL_OST BIT(1) /* initiate measurement */
	38	#define MPL3115_CTRL_ACTIVE BIT(0) /* continuous measurement */
	39	#define MPL3115_CTRL_OS_258MS (BIT(5) \| BIT(4)) /* 64x oversampling */
	40
	41	struct mpl3115_data {
	42	struct i2c_client *client;
	43	struct mutex lock;
	44	u8 ctrl_reg1;
	45	};
	46
	47	static int mpl3115_request(struct mpl3115_data *data)
	48	{
	49	int ret, tries = 15;
	50
	51	/* trigger measurement */
	52	ret = i2c_smbus_write_byte_data(data->client, MPL3115_CTRL_REG1,
	53	data->ctrl_reg1 \| MPL3115_CTRL_OST);
	54	if (ret < 0)
	55	return ret;
	56
	57	while (tries-- > 0) {
	58	ret = i2c_smbus_read_byte_data(data->client, MPL3115_CTRL_REG1);
	59	if (ret < 0)
	60	return ret;
	61	/* wait for data ready, i.e. OST cleared */
	62	if (!(ret & MPL3115_CTRL_OST))
	63	break;
	64	msleep(20);
65	}
66
67	if (tries < 0) {
68	dev_err(&data->client->dev, "data not ready\n");
69	return -EIO;
70	}
71
72	return 0;
73	}
74
75	static int mpl3115_read_raw(struct iio_dev *indio_dev,
76	struct iio_chan_spec const *chan,
77	int val, int val2, long mask)
78	{
79	struct mpl3115_data *data = iio_priv(indio_dev);
4a2bbdb4	80	__be32 tmp = 0;
cc26ad45 PM	81	int ret;
	82
	83	switch (mask) {
	84	case IIO_CHAN_INFO_RAW:
ac139805 AS	85	ret = iio_device_claim_direct_mode(indio_dev);
	86	if (ret)
	87	return ret;
cc26ad45 PM	88
	89	switch (chan->type) {
	90	case IIO_PRESSURE: /* in 0.25 pascal / LSB */
	91	mutex_lock(&data->lock);
	92	ret = mpl3115_request(data);
	93	if (ret < 0) {
	94	mutex_unlock(&data->lock);
ac139805	95	break;
cc26ad45 PM	96	}
	97	ret = i2c_smbus_read_i2c_block_data(data->client,
	98	MPL3115_OUT_PRESS, 3, (u8 *) &tmp);
	99	mutex_unlock(&data->lock);
	100	if (ret < 0)
ac139805	101	break;
d29f5929	102	*val = be32_to_cpu(tmp) >> 12;
ac139805 AS	103	ret = IIO_VAL_INT;
ac139805 AS	104	break;
cc26ad45 PM	105	case IIO_TEMP: /* in 0.0625 celsius / LSB */
	106	mutex_lock(&data->lock);
	107	ret = mpl3115_request(data);
	108	if (ret < 0) {
	109	mutex_unlock(&data->lock);
ac139805	110	break;
cc26ad45 PM	111	}
	112	ret = i2c_smbus_read_i2c_block_data(data->client,
	113	MPL3115_OUT_TEMP, 2, (u8 *) &tmp);
	114	mutex_unlock(&data->lock);
	115	if (ret < 0)
ac139805	116	break;
d29f5929	117	*val = sign_extend32(be32_to_cpu(tmp) >> 20, 11);
ac139805 AS	118	ret = IIO_VAL_INT;
ac139805 AS	119	break;
cc26ad45	120	default:
ac139805 AS	121	ret = -EINVAL;
ac139805 AS	122	break;
cc26ad45	123	}
ac139805 AS	124
	125	iio_device_release_direct_mode(indio_dev);
	126	return ret;
	127
cc26ad45 PM	128	case IIO_CHAN_INFO_SCALE:
	129	switch (chan->type) {
	130	case IIO_PRESSURE:
	131	*val = 0;
	132	val2 = 250; / want kilopascal */
	133	return IIO_VAL_INT_PLUS_MICRO;
	134	case IIO_TEMP:
	135	*val = 0;
	136	*val2 = 62500;
	137	return IIO_VAL_INT_PLUS_MICRO;
	138	default:
	139	return -EINVAL;
	140	}
	141	}
	142	return -EINVAL;
	143	}
	144
	145	static irqreturn_t mpl3115_trigger_handler(int irq, void *p)
	146	{
	147	struct iio_poll_func *pf = p;
	148	struct iio_dev *indio_dev = pf->indio_dev;
	149	struct mpl3115_data *data = iio_priv(indio_dev);
	150	u8 buffer[16]; /* 32-bit channel + 16-bit channel + padding + ts */
	151	int ret, pos = 0;
	152
	153	mutex_lock(&data->lock);
	154	ret = mpl3115_request(data);
	155	if (ret < 0) {
	156	mutex_unlock(&data->lock);
	157	goto done;
	158	}
	159
	160	memset(buffer, 0, sizeof(buffer));
	161	if (test_bit(0, indio_dev->active_scan_mask)) {
	162	ret = i2c_smbus_read_i2c_block_data(data->client,
	163	MPL3115_OUT_PRESS, 3, &buffer[pos]);
	164	if (ret < 0) {
	165	mutex_unlock(&data->lock);
	166	goto done;
	167	}
	168	pos += 4;
	169	}
	170
	171	if (test_bit(1, indio_dev->active_scan_mask)) {
	172	ret = i2c_smbus_read_i2c_block_data(data->client,
	173	MPL3115_OUT_TEMP, 2, &buffer[pos]);
	174	if (ret < 0) {
	175	mutex_unlock(&data->lock);
	176	goto done;
	177	}
	178	}
	179	mutex_unlock(&data->lock);
	180
	181	iio_push_to_buffers_with_timestamp(indio_dev, buffer,
bc2b7dab	182	iio_get_time_ns(indio_dev));
cc26ad45 PM	183
	184	done:
	185	iio_trigger_notify_done(indio_dev->trig);
	186	return IRQ_HANDLED;
	187	}
	188
	189	static const struct iio_chan_spec mpl3115_channels[] = {
	190	{
	191	.type = IIO_PRESSURE,
	192	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
9cf6cdba	193	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
cc26ad45 PM	194	.scan_index = 0,
cc26ad45 PM	195	.scan_type = {
d29f5929	196	.sign = 'u',
cc26ad45 PM	197	.realbits = 20,
	198	.storagebits = 32,
	199	.shift = 12,
	200	.endianness = IIO_BE,
	201	}
	202	},
	203	{
	204	.type = IIO_TEMP,
	205	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
9cf6cdba	206	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
cc26ad45 PM	207	.scan_index = 1,
	208	.scan_type = {
	209	.sign = 's',
	210	.realbits = 12,
	211	.storagebits = 16,
	212	.shift = 4,
	213	.endianness = IIO_BE,
	214	}
	215	},
	216	IIO_CHAN_SOFT_TIMESTAMP(2),
	217	};
	218
	219	static const struct iio_info mpl3115_info = {
	220	.read_raw = &mpl3115_read_raw,
	221	.driver_module = THIS_MODULE,
	222	};
	223
	224	static int mpl3115_probe(struct i2c_client *client,
	225	const struct i2c_device_id *id)
	226	{
	227	struct mpl3115_data *data;
	228	struct iio_dev *indio_dev;
	229	int ret;
	230
	231	ret = i2c_smbus_read_byte_data(client, MPL3115_WHO_AM_I);
	232	if (ret < 0)
	233	return ret;
	234	if (ret != MPL3115_DEVICE_ID)
	235	return -ENODEV;
	236
	237	indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
	238	if (!indio_dev)
	239	return -ENOMEM;
	240
	241	data = iio_priv(indio_dev);
	242	data->client = client;
	243	mutex_init(&data->lock);
	244
	245	i2c_set_clientdata(client, indio_dev);
	246	indio_dev->info = &mpl3115_info;
	247	indio_dev->name = id->name;
	248	indio_dev->dev.parent = &client->dev;
	249	indio_dev->modes = INDIO_DIRECT_MODE;
	250	indio_dev->channels = mpl3115_channels;
	251	indio_dev->num_channels = ARRAY_SIZE(mpl3115_channels);
	252
	253	/* software reset, I2C transfer is aborted (fails) */
	254	i2c_smbus_write_byte_data(client, MPL3115_CTRL_REG1,
	255	MPL3115_CTRL_RESET);
	256	msleep(50);
	257
	258	data->ctrl_reg1 = MPL3115_CTRL_OS_258MS;
	259	ret = i2c_smbus_write_byte_data(client, MPL3115_CTRL_REG1,
	260	data->ctrl_reg1);
	261	if (ret < 0)
	262	return ret;
	263
	264	ret = iio_triggered_buffer_setup(indio_dev, NULL,
	265	mpl3115_trigger_handler, NULL);
	266	if (ret < 0)
	267	return ret;
	268
	269	ret = iio_device_register(indio_dev);
	270	if (ret < 0)
271	goto buffer_cleanup;
272	return 0;
273
274	buffer_cleanup:
275	iio_triggered_buffer_cleanup(indio_dev);
276	return ret;
277	}
278
279	static int mpl3115_standby(struct mpl3115_data *data)
280	{
281	return i2c_smbus_write_byte_data(data->client, MPL3115_CTRL_REG1,
282	data->ctrl_reg1 & ~MPL3115_CTRL_ACTIVE);
283	}
284
285	static int mpl3115_remove(struct i2c_client *client)
286	{
287	struct iio_dev *indio_dev = i2c_get_clientdata(client);
288
289	iio_device_unregister(indio_dev);
290	iio_triggered_buffer_cleanup(indio_dev);
291	mpl3115_standby(iio_priv(indio_dev));
292
293	return 0;
294	}
295
296	#ifdef CONFIG_PM_SLEEP
297	static int mpl3115_suspend(struct device *dev)
298	{
299	return mpl3115_standby(iio_priv(i2c_get_clientdata(
300	to_i2c_client(dev))));
301	}
302
303	static int mpl3115_resume(struct device *dev)
304	{
305	struct mpl3115_data *data = iio_priv(i2c_get_clientdata(
306	to_i2c_client(dev)));
307
308	return i2c_smbus_write_byte_data(data->client, MPL3115_CTRL_REG1,
309	data->ctrl_reg1);
310	}
311
312	static SIMPLE_DEV_PM_OPS(mpl3115_pm_ops, mpl3115_suspend, mpl3115_resume);
313	#define MPL3115_PM_OPS (&mpl3115_pm_ops)
314	#else
315	#define MPL3115_PM_OPS NULL
316	#endif
317
318	static const struct i2c_device_id mpl3115_id[] = {
319	{ "mpl3115", 0 },
320	{ }
321	};
322	MODULE_DEVICE_TABLE(i2c, mpl3115_id);
323
324	static struct i2c_driver mpl3115_driver = {
325	.driver = {
326	.name = "mpl3115",
327	.pm = MPL3115_PM_OPS,
328	},
329	.probe = mpl3115_probe,
330	.remove = mpl3115_remove,
331	.id_table = mpl3115_id,
332	};
333	module_i2c_driver(mpl3115_driver);
334
335	MODULE_AUTHOR("Peter Meerwald <pmeerw@pmeerw.net>");
336	MODULE_DESCRIPTION("Freescale MPL3115 pressure/temperature driver");
337	MODULE_LICENSE("GPL");