[mirror_ubuntu-jammy-kernel.git] / drivers / iio / adc / ti-adc0832.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * ADC0831/ADC0832/ADC0834/ADC0838 8-bit ADC driver
 *
 * Copyright (c) 2016 Akinobu Mita <akinobu.mita@gmail.com>
 *
 * Datasheet: http://www.ti.com/lit/ds/symlink/adc0832-n.pdf
 */

#include <linux/module.h>
#include <linux/spi/spi.h>
#include <linux/iio/iio.h>
#include <linux/regulator/consumer.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>

enum {
	adc0831,
	adc0832,
	adc0834,
	adc0838,
};

struct adc0832 {
	struct spi_device *spi;
	struct regulator *reg;
	struct mutex lock;
	u8 mux_bits;

	u8 tx_buf[2] ____cacheline_aligned;
	u8 rx_buf[2];
};

#define ADC0832_VOLTAGE_CHANNEL(chan)					\
	{								\
		.type = IIO_VOLTAGE,					\
		.indexed = 1,						\
		.channel = chan,					\
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
		.scan_index = chan,					\
		.scan_type = {						\
			.sign = 'u',					\
			.realbits = 8,					\
			.storagebits = 8,				\
		},							\
	}

#define ADC0832_VOLTAGE_CHANNEL_DIFF(chan1, chan2, si)			\
	{								\
		.type = IIO_VOLTAGE,					\
		.indexed = 1,						\
		.channel = (chan1),					\
		.channel2 = (chan2),					\
		.differential = 1,					\
		.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),		\
		.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),	\
		.scan_index = si,					\
		.scan_type = {						\
			.sign = 'u',					\
			.realbits = 8,					\
			.storagebits = 8,				\
		},							\
	}

static const struct iio_chan_spec adc0831_channels[] = {
	ADC0832_VOLTAGE_CHANNEL_DIFF(0, 1, 0),
	IIO_CHAN_SOFT_TIMESTAMP(1),
};

static const struct iio_chan_spec adc0832_channels[] = {
	ADC0832_VOLTAGE_CHANNEL(0),
	ADC0832_VOLTAGE_CHANNEL(1),
	ADC0832_VOLTAGE_CHANNEL_DIFF(0, 1, 2),
	ADC0832_VOLTAGE_CHANNEL_DIFF(1, 0, 3),
	IIO_CHAN_SOFT_TIMESTAMP(4),
};

static const struct iio_chan_spec adc0834_channels[] = {
	ADC0832_VOLTAGE_CHANNEL(0),
	ADC0832_VOLTAGE_CHANNEL(1),
	ADC0832_VOLTAGE_CHANNEL(2),
	ADC0832_VOLTAGE_CHANNEL(3),
	ADC0832_VOLTAGE_CHANNEL_DIFF(0, 1, 4),
	ADC0832_VOLTAGE_CHANNEL_DIFF(1, 0, 5),
	ADC0832_VOLTAGE_CHANNEL_DIFF(2, 3, 6),
	ADC0832_VOLTAGE_CHANNEL_DIFF(3, 2, 7),
	IIO_CHAN_SOFT_TIMESTAMP(8),
};

static const struct iio_chan_spec adc0838_channels[] = {
	ADC0832_VOLTAGE_CHANNEL(0),
	ADC0832_VOLTAGE_CHANNEL(1),
	ADC0832_VOLTAGE_CHANNEL(2),
	ADC0832_VOLTAGE_CHANNEL(3),
	ADC0832_VOLTAGE_CHANNEL(4),
	ADC0832_VOLTAGE_CHANNEL(5),
	ADC0832_VOLTAGE_CHANNEL(6),
	ADC0832_VOLTAGE_CHANNEL(7),
	ADC0832_VOLTAGE_CHANNEL_DIFF(0, 1, 8),
	ADC0832_VOLTAGE_CHANNEL_DIFF(1, 0, 9),
	ADC0832_VOLTAGE_CHANNEL_DIFF(2, 3, 10),
	ADC0832_VOLTAGE_CHANNEL_DIFF(3, 2, 11),
	ADC0832_VOLTAGE_CHANNEL_DIFF(4, 5, 12),
	ADC0832_VOLTAGE_CHANNEL_DIFF(5, 4, 13),
	ADC0832_VOLTAGE_CHANNEL_DIFF(6, 7, 14),
	ADC0832_VOLTAGE_CHANNEL_DIFF(7, 6, 15),
	IIO_CHAN_SOFT_TIMESTAMP(16),
};

static int adc0831_adc_conversion(struct adc0832 *adc)
{
	struct spi_device *spi = adc->spi;
	int ret;

	ret = spi_read(spi, &adc->rx_buf, 2);
	if (ret)
		return ret;

	/*
	 * Skip TRI-STATE and a leading zero
	 */
	return (adc->rx_buf[0] << 2 & 0xff) | (adc->rx_buf[1] >> 6);
}

static int adc0832_adc_conversion(struct adc0832 *adc, int channel,
				bool differential)
{
	struct spi_device *spi = adc->spi;
	struct spi_transfer xfer = {
		.tx_buf = adc->tx_buf,
		.rx_buf = adc->rx_buf,
		.len = 2,
	};
	int ret;

	if (!adc->mux_bits)
		return adc0831_adc_conversion(adc);

	/* start bit */
	adc->tx_buf[0] = 1 << (adc->mux_bits + 1);
	/* single-ended or differential */
	adc->tx_buf[0] |= differential ? 0 : (1 << adc->mux_bits);
	/* odd / sign */
	adc->tx_buf[0] |= (channel % 2) << (adc->mux_bits - 1);
	/* select */
	if (adc->mux_bits > 1)
		adc->tx_buf[0] |= channel / 2;

	/* align Data output BIT7 (MSB) to 8-bit boundary */
	adc->tx_buf[0] <<= 1;

	ret = spi_sync_transfer(spi, &xfer, 1);
	if (ret)
		return ret;

	return adc->rx_buf[1];
}

static int adc0832_read_raw(struct iio_dev *iio,
			struct iio_chan_spec const *channel, int *value,
			int *shift, long mask)
{
	struct adc0832 *adc = iio_priv(iio);

	switch (mask) {
	case IIO_CHAN_INFO_RAW:
		mutex_lock(&adc->lock);
		*value = adc0832_adc_conversion(adc, channel->channel,
						channel->differential);
		mutex_unlock(&adc->lock);
		if (*value < 0)
			return *value;

		return IIO_VAL_INT;
	case IIO_CHAN_INFO_SCALE:
		*value = regulator_get_voltage(adc->reg);
		if (*value < 0)
			return *value;

		/* convert regulator output voltage to mV */
		*value /= 1000;
		*shift = 8;

		return IIO_VAL_FRACTIONAL_LOG2;
	}

	return -EINVAL;
}

static const struct iio_info adc0832_info = {
	.read_raw = adc0832_read_raw,
};

static irqreturn_t adc0832_trigger_handler(int irq, void *p)
{
	struct iio_poll_func *pf = p;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct adc0832 *adc = iio_priv(indio_dev);
	u8 data[24] = { }; /* 16x 1 byte ADC data + 8 bytes timestamp */
	int scan_index;
	int i = 0;

	mutex_lock(&adc->lock);

	for_each_set_bit(scan_index, indio_dev->active_scan_mask,
			 indio_dev->masklength) {
		const struct iio_chan_spec *scan_chan =
				&indio_dev->channels[scan_index];
		int ret = adc0832_adc_conversion(adc, scan_chan->channel,
						 scan_chan->differential);
		if (ret < 0) {
			dev_warn(&adc->spi->dev,
				 "failed to get conversion data\n");
			goto out;
		}

		data[i] = ret;
		i++;
	}
	iio_push_to_buffers_with_timestamp(indio_dev, data,
					   iio_get_time_ns(indio_dev));
out:
	mutex_unlock(&adc->lock);

	iio_trigger_notify_done(indio_dev->trig);

	return IRQ_HANDLED;
}

static int adc0832_probe(struct spi_device *spi)
{
	struct iio_dev *indio_dev;
	struct adc0832 *adc;
	int ret;

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

	adc = iio_priv(indio_dev);
	adc->spi = spi;
	mutex_init(&adc->lock);

	indio_dev->name = spi_get_device_id(spi)->name;
	indio_dev->dev.parent = &spi->dev;
	indio_dev->dev.of_node = spi->dev.of_node;
	indio_dev->info = &adc0832_info;
	indio_dev->modes = INDIO_DIRECT_MODE;

	switch (spi_get_device_id(spi)->driver_data) {
	case adc0831:
		adc->mux_bits = 0;
		indio_dev->channels = adc0831_channels;
		indio_dev->num_channels = ARRAY_SIZE(adc0831_channels);
		break;
	case adc0832:
		adc->mux_bits = 1;
		indio_dev->channels = adc0832_channels;
		indio_dev->num_channels = ARRAY_SIZE(adc0832_channels);
		break;
	case adc0834:
		adc->mux_bits = 2;
		indio_dev->channels = adc0834_channels;
		indio_dev->num_channels = ARRAY_SIZE(adc0834_channels);
		break;
	case adc0838:
		adc->mux_bits = 3;
		indio_dev->channels = adc0838_channels;
		indio_dev->num_channels = ARRAY_SIZE(adc0838_channels);
		break;
	default:
		return -EINVAL;
	}

	adc->reg = devm_regulator_get(&spi->dev, "vref");
	if (IS_ERR(adc->reg))
		return PTR_ERR(adc->reg);

	ret = regulator_enable(adc->reg);
	if (ret)
		return ret;

	spi_set_drvdata(spi, indio_dev);

	ret = iio_triggered_buffer_setup(indio_dev, NULL,
					 adc0832_trigger_handler, NULL);
	if (ret)
		goto err_reg_disable;

	ret = iio_device_register(indio_dev);
	if (ret)
		goto err_buffer_cleanup;

	return 0;
err_buffer_cleanup:
	iio_triggered_buffer_cleanup(indio_dev);
err_reg_disable:
	regulator_disable(adc->reg);

	return ret;
}

static int adc0832_remove(struct spi_device *spi)
{
	struct iio_dev *indio_dev = spi_get_drvdata(spi);
	struct adc0832 *adc = iio_priv(indio_dev);

	iio_device_unregister(indio_dev);
	iio_triggered_buffer_cleanup(indio_dev);
	regulator_disable(adc->reg);

	return 0;
}

#ifdef CONFIG_OF

static const struct of_device_id adc0832_dt_ids[] = {
	{ .compatible = "ti,adc0831", },
	{ .compatible = "ti,adc0832", },
	{ .compatible = "ti,adc0834", },
	{ .compatible = "ti,adc0838", },
	{}
};
MODULE_DEVICE_TABLE(of, adc0832_dt_ids);

#endif

static const struct spi_device_id adc0832_id[] = {
	{ "adc0831", adc0831 },
	{ "adc0832", adc0832 },
	{ "adc0834", adc0834 },
	{ "adc0838", adc0838 },
	{}
};
MODULE_DEVICE_TABLE(spi, adc0832_id);

static struct spi_driver adc0832_driver = {
	.driver = {
		.name = "adc0832",
		.of_match_table = of_match_ptr(adc0832_dt_ids),
	},
	.probe = adc0832_probe,
	.remove = adc0832_remove,
	.id_table = adc0832_id,
};
module_spi_driver(adc0832_driver);

MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
MODULE_DESCRIPTION("ADC0831/ADC0832/ADC0834/ADC0838 driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
36edc939	1	// SPDX-License-Identifier: GPL-2.0-only
efc945fb AM	2	/*
	3	* ADC0831/ADC0832/ADC0834/ADC0838 8-bit ADC driver
	4	*
	5	* Copyright (c) 2016 Akinobu Mita <akinobu.mita@gmail.com>
	6	*
efc945fb AM	7	* Datasheet: http://www.ti.com/lit/ds/symlink/adc0832-n.pdf
	8	*/
	9
	10	#include <linux/module.h>
	11	#include <linux/spi/spi.h>
	12	#include <linux/iio/iio.h>
	13	#include <linux/regulator/consumer.h>
815bbc87 AM	14	#include <linux/iio/buffer.h>
	15	#include <linux/iio/trigger.h>
	16	#include <linux/iio/triggered_buffer.h>
	17	#include <linux/iio/trigger_consumer.h>
efc945fb AM	18
	19	enum {
	20	adc0831,
	21	adc0832,
	22	adc0834,
	23	adc0838,
	24	};
	25
	26	struct adc0832 {
	27	struct spi_device *spi;
	28	struct regulator *reg;
	29	struct mutex lock;
	30	u8 mux_bits;
	31
	32	u8 tx_buf[2] ____cacheline_aligned;
	33	u8 rx_buf[2];
	34	};
	35
	36	#define ADC0832_VOLTAGE_CHANNEL(chan) \
	37	{ \
	38	.type = IIO_VOLTAGE, \
	39	.indexed = 1, \
	40	.channel = chan, \
	41	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
815bbc87 AM	42	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
	43	.scan_index = chan, \
	44	.scan_type = { \
	45	.sign = 'u', \
	46	.realbits = 8, \
	47	.storagebits = 8, \
	48	}, \
efc945fb AM	49	}
efc945fb AM	50
815bbc87	51	#define ADC0832_VOLTAGE_CHANNEL_DIFF(chan1, chan2, si) \
efc945fb AM	52	{ \
	53	.type = IIO_VOLTAGE, \
	54	.indexed = 1, \
	55	.channel = (chan1), \
	56	.channel2 = (chan2), \
	57	.differential = 1, \
	58	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
815bbc87 AM	59	.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
	60	.scan_index = si, \
	61	.scan_type = { \
	62	.sign = 'u', \
	63	.realbits = 8, \
	64	.storagebits = 8, \
	65	}, \
efc945fb AM	66	}
	67
	68	static const struct iio_chan_spec adc0831_channels[] = {
815bbc87 AM	69	ADC0832_VOLTAGE_CHANNEL_DIFF(0, 1, 0),
815bbc87 AM	70	IIO_CHAN_SOFT_TIMESTAMP(1),
efc945fb AM	71	};
	72
	73	static const struct iio_chan_spec adc0832_channels[] = {
	74	ADC0832_VOLTAGE_CHANNEL(0),
	75	ADC0832_VOLTAGE_CHANNEL(1),
815bbc87 AM	76	ADC0832_VOLTAGE_CHANNEL_DIFF(0, 1, 2),
	77	ADC0832_VOLTAGE_CHANNEL_DIFF(1, 0, 3),
	78	IIO_CHAN_SOFT_TIMESTAMP(4),
efc945fb AM	79	};
	80
	81	static const struct iio_chan_spec adc0834_channels[] = {
	82	ADC0832_VOLTAGE_CHANNEL(0),
	83	ADC0832_VOLTAGE_CHANNEL(1),
	84	ADC0832_VOLTAGE_CHANNEL(2),
	85	ADC0832_VOLTAGE_CHANNEL(3),
815bbc87 AM	86	ADC0832_VOLTAGE_CHANNEL_DIFF(0, 1, 4),
	87	ADC0832_VOLTAGE_CHANNEL_DIFF(1, 0, 5),
	88	ADC0832_VOLTAGE_CHANNEL_DIFF(2, 3, 6),
	89	ADC0832_VOLTAGE_CHANNEL_DIFF(3, 2, 7),
	90	IIO_CHAN_SOFT_TIMESTAMP(8),
efc945fb AM	91	};
	92
	93	static const struct iio_chan_spec adc0838_channels[] = {
	94	ADC0832_VOLTAGE_CHANNEL(0),
	95	ADC0832_VOLTAGE_CHANNEL(1),
	96	ADC0832_VOLTAGE_CHANNEL(2),
	97	ADC0832_VOLTAGE_CHANNEL(3),
	98	ADC0832_VOLTAGE_CHANNEL(4),
	99	ADC0832_VOLTAGE_CHANNEL(5),
	100	ADC0832_VOLTAGE_CHANNEL(6),
	101	ADC0832_VOLTAGE_CHANNEL(7),
815bbc87 AM	102	ADC0832_VOLTAGE_CHANNEL_DIFF(0, 1, 8),
	103	ADC0832_VOLTAGE_CHANNEL_DIFF(1, 0, 9),
	104	ADC0832_VOLTAGE_CHANNEL_DIFF(2, 3, 10),
	105	ADC0832_VOLTAGE_CHANNEL_DIFF(3, 2, 11),
	106	ADC0832_VOLTAGE_CHANNEL_DIFF(4, 5, 12),
	107	ADC0832_VOLTAGE_CHANNEL_DIFF(5, 4, 13),
	108	ADC0832_VOLTAGE_CHANNEL_DIFF(6, 7, 14),
	109	ADC0832_VOLTAGE_CHANNEL_DIFF(7, 6, 15),
	110	IIO_CHAN_SOFT_TIMESTAMP(16),
efc945fb AM	111	};
	112
	113	static int adc0831_adc_conversion(struct adc0832 *adc)
	114	{
	115	struct spi_device *spi = adc->spi;
	116	int ret;
	117
	118	ret = spi_read(spi, &adc->rx_buf, 2);
	119	if (ret)
	120	return ret;
	121
	122	/*
	123	* Skip TRI-STATE and a leading zero
	124	*/
	125	return (adc->rx_buf[0] << 2 & 0xff) \| (adc->rx_buf[1] >> 6);
	126	}
	127
	128	static int adc0832_adc_conversion(struct adc0832 *adc, int channel,
	129	bool differential)
	130	{
	131	struct spi_device *spi = adc->spi;
	132	struct spi_transfer xfer = {
	133	.tx_buf = adc->tx_buf,
	134	.rx_buf = adc->rx_buf,
	135	.len = 2,
	136	};
	137	int ret;
	138
	139	if (!adc->mux_bits)
	140	return adc0831_adc_conversion(adc);
	141
	142	/* start bit */
	143	adc->tx_buf[0] = 1 << (adc->mux_bits + 1);
	144	/* single-ended or differential */
	145	adc->tx_buf[0] \|= differential ? 0 : (1 << adc->mux_bits);
	146	/* odd / sign */
	147	adc->tx_buf[0] \|= (channel % 2) << (adc->mux_bits - 1);
	148	/* select */
	149	if (adc->mux_bits > 1)
	150	adc->tx_buf[0] \|= channel / 2;
	151
	152	/* align Data output BIT7 (MSB) to 8-bit boundary */
	153	adc->tx_buf[0] <<= 1;
	154
	155	ret = spi_sync_transfer(spi, &xfer, 1);
	156	if (ret)
	157	return ret;
	158
	159	return adc->rx_buf[1];
	160	}
	161
	162	static int adc0832_read_raw(struct iio_dev *iio,
	163	struct iio_chan_spec const channel, int value,
	164	int *shift, long mask)
	165	{
	166	struct adc0832 *adc = iio_priv(iio);
	167
	168	switch (mask) {
	169	case IIO_CHAN_INFO_RAW:
	170	mutex_lock(&adc->lock);
	171	*value = adc0832_adc_conversion(adc, channel->channel,
	172	channel->differential);
	173	mutex_unlock(&adc->lock);
	174	if (*value < 0)
175	return *value;
176
177	return IIO_VAL_INT;
178	case IIO_CHAN_INFO_SCALE:
179	*value = regulator_get_voltage(adc->reg);
180	if (*value < 0)
181	return *value;
182
183	/* convert regulator output voltage to mV */
184	*value /= 1000;
185	*shift = 8;
186
187	return IIO_VAL_FRACTIONAL_LOG2;
188	}
189
190	return -EINVAL;
191	}
192
193	static const struct iio_info adc0832_info = {
194	.read_raw = adc0832_read_raw,
efc945fb AM	195	};
efc945fb AM	196
815bbc87 AM	197	static irqreturn_t adc0832_trigger_handler(int irq, void *p)
	198	{
	199	struct iio_poll_func *pf = p;
	200	struct iio_dev *indio_dev = pf->indio_dev;
	201	struct adc0832 *adc = iio_priv(indio_dev);
	202	u8 data[24] = { }; /* 16x 1 byte ADC data + 8 bytes timestamp */
	203	int scan_index;
	204	int i = 0;
	205
	206	mutex_lock(&adc->lock);
	207
	208	for_each_set_bit(scan_index, indio_dev->active_scan_mask,
	209	indio_dev->masklength) {
	210	const struct iio_chan_spec *scan_chan =
	211	&indio_dev->channels[scan_index];
	212	int ret = adc0832_adc_conversion(adc, scan_chan->channel,
	213	scan_chan->differential);
	214	if (ret < 0) {
	215	dev_warn(&adc->spi->dev,
	216	"failed to get conversion data\n");
	217	goto out;
	218	}
	219
	220	data[i] = ret;
	221	i++;
	222	}
	223	iio_push_to_buffers_with_timestamp(indio_dev, data,
	224	iio_get_time_ns(indio_dev));
	225	out:
	226	mutex_unlock(&adc->lock);
	227
	228	iio_trigger_notify_done(indio_dev->trig);
	229
	230	return IRQ_HANDLED;
	231	}
	232
efc945fb AM	233	static int adc0832_probe(struct spi_device *spi)
	234	{
	235	struct iio_dev *indio_dev;
	236	struct adc0832 *adc;
	237	int ret;
	238
	239	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*adc));
	240	if (!indio_dev)
	241	return -ENOMEM;
	242
	243	adc = iio_priv(indio_dev);
	244	adc->spi = spi;
	245	mutex_init(&adc->lock);
	246
	247	indio_dev->name = spi_get_device_id(spi)->name;
	248	indio_dev->dev.parent = &spi->dev;
b541eaff	249	indio_dev->dev.of_node = spi->dev.of_node;
efc945fb AM	250	indio_dev->info = &adc0832_info;
	251	indio_dev->modes = INDIO_DIRECT_MODE;
	252
	253	switch (spi_get_device_id(spi)->driver_data) {
	254	case adc0831:
	255	adc->mux_bits = 0;
	256	indio_dev->channels = adc0831_channels;
	257	indio_dev->num_channels = ARRAY_SIZE(adc0831_channels);
	258	break;
	259	case adc0832:
	260	adc->mux_bits = 1;
	261	indio_dev->channels = adc0832_channels;
	262	indio_dev->num_channels = ARRAY_SIZE(adc0832_channels);
	263	break;
	264	case adc0834:
	265	adc->mux_bits = 2;
	266	indio_dev->channels = adc0834_channels;
	267	indio_dev->num_channels = ARRAY_SIZE(adc0834_channels);
	268	break;
	269	case adc0838:
	270	adc->mux_bits = 3;
	271	indio_dev->channels = adc0838_channels;
	272	indio_dev->num_channels = ARRAY_SIZE(adc0838_channels);
	273	break;
	274	default:
	275	return -EINVAL;
	276	}
	277
	278	adc->reg = devm_regulator_get(&spi->dev, "vref");
	279	if (IS_ERR(adc->reg))
	280	return PTR_ERR(adc->reg);
	281
	282	ret = regulator_enable(adc->reg);
	283	if (ret)
	284	return ret;
	285
	286	spi_set_drvdata(spi, indio_dev);
	287
815bbc87 AM	288	ret = iio_triggered_buffer_setup(indio_dev, NULL,
	289	adc0832_trigger_handler, NULL);
	290	if (ret)
	291	goto err_reg_disable;
	292
efc945fb AM	293	ret = iio_device_register(indio_dev);
efc945fb AM	294	if (ret)
815bbc87 AM	295	goto err_buffer_cleanup;
	296
	297	return 0;
	298	err_buffer_cleanup:
	299	iio_triggered_buffer_cleanup(indio_dev);
	300	err_reg_disable:
	301	regulator_disable(adc->reg);
efc945fb AM	302
	303	return ret;
	304	}
	305
	306	static int adc0832_remove(struct spi_device *spi)
	307	{
	308	struct iio_dev *indio_dev = spi_get_drvdata(spi);
	309	struct adc0832 *adc = iio_priv(indio_dev);
	310
	311	iio_device_unregister(indio_dev);
815bbc87	312	iio_triggered_buffer_cleanup(indio_dev);
efc945fb AM	313	regulator_disable(adc->reg);
	314
	315	return 0;
	316	}
	317
	318	#ifdef CONFIG_OF
	319
	320	static const struct of_device_id adc0832_dt_ids[] = {
	321	{ .compatible = "ti,adc0831", },
	322	{ .compatible = "ti,adc0832", },
	323	{ .compatible = "ti,adc0834", },
	324	{ .compatible = "ti,adc0838", },
	325	{}
	326	};
	327	MODULE_DEVICE_TABLE(of, adc0832_dt_ids);
	328
	329	#endif
	330
	331	static const struct spi_device_id adc0832_id[] = {
	332	{ "adc0831", adc0831 },
	333	{ "adc0832", adc0832 },
	334	{ "adc0834", adc0834 },
	335	{ "adc0838", adc0838 },
	336	{}
	337	};
	338	MODULE_DEVICE_TABLE(spi, adc0832_id);
	339
	340	static struct spi_driver adc0832_driver = {
	341	.driver = {
	342	.name = "adc0832",
	343	.of_match_table = of_match_ptr(adc0832_dt_ids),
	344	},
	345	.probe = adc0832_probe,
	346	.remove = adc0832_remove,
	347	.id_table = adc0832_id,
	348	};
	349	module_spi_driver(adc0832_driver);
	350
	351	MODULE_AUTHOR("Akinobu Mita <akinobu.mita@gmail.com>");
	352	MODULE_DESCRIPTION("ADC0831/ADC0832/ADC0834/ADC0838 driver");
	353	MODULE_LICENSE("GPL v2");