[linux-block.git] / drivers / iio / imu / adis16400_buffer.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/interrupt.h>
#include <linux/mutex.h>
#include <linux/kernel.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include <linux/export.h>

#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>

#include "adis16400.h"

int adis16400_update_scan_mode(struct iio_dev *indio_dev,
	const unsigned long *scan_mask)
{
	struct adis16400_state *st = iio_priv(indio_dev);
	struct adis *adis = &st->adis;
	unsigned int burst_length;
	u8 *tx;

	if (st->variant->flags & ADIS16400_NO_BURST)
		return adis_update_scan_mode(indio_dev, scan_mask);

	kfree(adis->xfer);
	kfree(adis->buffer);

	/* All but the timestamp channel */
	burst_length = (indio_dev->num_channels - 1) * sizeof(u16);
	if (st->variant->flags & ADIS16400_BURST_DIAG_STAT)
		burst_length += sizeof(u16);

	adis->xfer = kcalloc(2, sizeof(*adis->xfer), GFP_KERNEL);
	if (!adis->xfer)
		return -ENOMEM;

	adis->buffer = kzalloc(burst_length + sizeof(u16), GFP_KERNEL);
	if (!adis->buffer)
		return -ENOMEM;

	tx = adis->buffer + burst_length;
	tx[0] = ADIS_READ_REG(ADIS16400_GLOB_CMD);
	tx[1] = 0;

	adis->xfer[0].tx_buf = tx;
	adis->xfer[0].bits_per_word = 8;
	adis->xfer[0].len = 2;
	adis->xfer[1].rx_buf = adis->buffer;
	adis->xfer[1].bits_per_word = 8;
	adis->xfer[1].len = burst_length;

	spi_message_init(&adis->msg);
	spi_message_add_tail(&adis->xfer[0], &adis->msg);
	spi_message_add_tail(&adis->xfer[1], &adis->msg);

	return 0;
}

irqreturn_t adis16400_trigger_handler(int irq, void *p)
{
	struct iio_poll_func *pf = p;
	struct iio_dev *indio_dev = pf->indio_dev;
	struct adis16400_state *st = iio_priv(indio_dev);
	struct adis *adis = &st->adis;
	u32 old_speed_hz = st->adis.spi->max_speed_hz;
	void *buffer;
	int ret;

	if (!adis->buffer)
		return -ENOMEM;

	if (!(st->variant->flags & ADIS16400_NO_BURST) &&
		st->adis.spi->max_speed_hz > ADIS16400_SPI_BURST) {
		st->adis.spi->max_speed_hz = ADIS16400_SPI_BURST;
		spi_setup(st->adis.spi);
	}

	ret = spi_sync(adis->spi, &adis->msg);
	if (ret)
		dev_err(&adis->spi->dev, "Failed to read data: %d\n", ret);

	if (!(st->variant->flags & ADIS16400_NO_BURST)) {
		st->adis.spi->max_speed_hz = old_speed_hz;
		spi_setup(st->adis.spi);
	}

	if (st->variant->flags & ADIS16400_BURST_DIAG_STAT)
		buffer = adis->buffer + sizeof(u16);
	else
		buffer = adis->buffer;

	iio_push_to_buffers_with_timestamp(indio_dev, buffer,
		pf->timestamp);

	iio_trigger_notify_done(indio_dev->trig);

	return IRQ_HANDLED;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
a9d26f00	2	#include <linux/interrupt.h>
a9d26f00	3	#include <linux/mutex.h>
a9d26f00 BS	4	#include <linux/kernel.h>
a9d26f00 BS	5	#include <linux/spi/spi.h>
1cb6c1f5	6	#include <linux/slab.h>
2a29a90b	7	#include <linux/bitops.h>
8e336a72	8	#include <linux/export.h>
a9d26f00	9
06458e27	10	#include <linux/iio/iio.h>
1ffe2e7a LPC	11	#include <linux/iio/buffer.h>
1ffe2e7a LPC	12	#include <linux/iio/triggered_buffer.h>
06458e27	13	#include <linux/iio/trigger_consumer.h>
cd888a17	14
a9d26f00 BS	15	#include "adis16400.h"
a9d26f00 BS	16
5eda3550 LPC	17	int adis16400_update_scan_mode(struct iio_dev *indio_dev,
5eda3550 LPC	18	const unsigned long *scan_mask)
3fd66da1	19	{
38d15f06	20	struct adis16400_state *st = iio_priv(indio_dev);
5eda3550	21	struct adis *adis = &st->adis;
9df56035 PC	22	unsigned int burst_length;
9df56035 PC	23	u8 *tx;
3fd66da1	24
5eda3550 LPC	25	if (st->variant->flags & ADIS16400_NO_BURST)
5eda3550 LPC	26	return adis_update_scan_mode(indio_dev, scan_mask);
3fd66da1	27
5eda3550 LPC	28	kfree(adis->xfer);
5eda3550 LPC	29	kfree(adis->buffer);
2a29a90b	30
9df56035 PC	31	/* All but the timestamp channel */
9df56035 PC	32	burst_length = (indio_dev->num_channels - 1) * sizeof(u16);
d046ba26 LPC	33	if (st->variant->flags & ADIS16400_BURST_DIAG_STAT)
d046ba26 LPC	34	burst_length += sizeof(u16);
9df56035	35
5eda3550 LPC	36	adis->xfer = kcalloc(2, sizeof(*adis->xfer), GFP_KERNEL);
	37	if (!adis->xfer)
	38	return -ENOMEM;
2a29a90b	39
9df56035	40	adis->buffer = kzalloc(burst_length + sizeof(u16), GFP_KERNEL);
5eda3550	41	if (!adis->buffer)
2a29a90b JC	42	return -ENOMEM;
2a29a90b JC	43
9df56035	44	tx = adis->buffer + burst_length;
5eda3550 LPC	45	tx[0] = ADIS_READ_REG(ADIS16400_GLOB_CMD);
	46	tx[1] = 0;
	47
	48	adis->xfer[0].tx_buf = tx;
	49	adis->xfer[0].bits_per_word = 8;
	50	adis->xfer[0].len = 2;
9df56035	51	adis->xfer[1].rx_buf = adis->buffer;
5eda3550	52	adis->xfer[1].bits_per_word = 8;
9df56035	53	adis->xfer[1].len = burst_length;
5eda3550 LPC	54
	55	spi_message_init(&adis->msg);
	56	spi_message_add_tail(&adis->xfer[0], &adis->msg);
	57	spi_message_add_tail(&adis->xfer[1], &adis->msg);
	58
	59	return 0;
2a29a90b JC	60	}
2a29a90b JC	61
5eda3550	62	irqreturn_t adis16400_trigger_handler(int irq, void *p)
a9d26f00	63	{
e7854845	64	struct iio_poll_func *pf = p;
e65bc6ac	65	struct iio_dev *indio_dev = pf->indio_dev;
38d15f06	66	struct adis16400_state *st = iio_priv(indio_dev);
5eda3550 LPC	67	struct adis *adis = &st->adis;
5eda3550 LPC	68	u32 old_speed_hz = st->adis.spi->max_speed_hz;
d046ba26	69	void *buffer;
5eda3550 LPC	70	int ret;
	71
	72	if (!adis->buffer)
	73	return -ENOMEM;
	74
	75	if (!(st->variant->flags & ADIS16400_NO_BURST) &&
	76	st->adis.spi->max_speed_hz > ADIS16400_SPI_BURST) {
	77	st->adis.spi->max_speed_hz = ADIS16400_SPI_BURST;
	78	spi_setup(st->adis.spi);
a9d26f00 BS	79	}
a9d26f00 BS	80
5eda3550 LPC	81	ret = spi_sync(adis->spi, &adis->msg);
	82	if (ret)
	83	dev_err(&adis->spi->dev, "Failed to read data: %d\n", ret);
	84
	85	if (!(st->variant->flags & ADIS16400_NO_BURST)) {
	86	st->adis.spi->max_speed_hz = old_speed_hz;
	87	spi_setup(st->adis.spi);
2a29a90b	88	}
5eda3550	89
d046ba26 LPC	90	if (st->variant->flags & ADIS16400_BURST_DIAG_STAT)
	91	buffer = adis->buffer + sizeof(u16);
	92	else
	93	buffer = adis->buffer;
	94
	95	iio_push_to_buffers_with_timestamp(indio_dev, buffer,
8c7b0322	96	pf->timestamp);
a9d26f00	97
e7854845	98	iio_trigger_notify_done(indio_dev->trig);
a9d26f00	99
e7854845	100	return IRQ_HANDLED;
a9d26f00	101	}