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Release 4.7 drivers/iio/common/st_sensors/st_sensors_spi.c

/*
 * STMicroelectronics sensors spi library driver
 *
 * Copyright 2012-2013 STMicroelectronics Inc.
 *
 * Denis Ciocca <denis.ciocca@st.com>
 *
 * Licensed under the GPL-2.
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/iio/iio.h>

#include <linux/iio/common/st_sensors_spi.h>



#define ST_SENSORS_SPI_MULTIREAD	0xc0

#define ST_SENSORS_SPI_READ		0x80


static unsigned int st_sensors_spi_get_irq(struct iio_dev *indio_dev) { struct st_sensor_data *sdata = iio_priv(indio_dev); return to_spi_device(sdata->dev)->irq; }

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static int st_sensors_spi_read(struct st_sensor_transfer_buffer *tb, struct device *dev, u8 reg_addr, int len, u8 *data, bool multiread_bit) { int err; struct spi_transfer xfers[] = { { .tx_buf = tb->tx_buf, .bits_per_word = 8, .len = 1, }, { .rx_buf = tb->rx_buf, .bits_per_word = 8, .len = len, } }; mutex_lock(&tb->buf_lock); if ((multiread_bit) && (len > 1)) tb->tx_buf[0] = reg_addr | ST_SENSORS_SPI_MULTIREAD; else tb->tx_buf[0] = reg_addr | ST_SENSORS_SPI_READ; err = spi_sync_transfer(to_spi_device(dev), xfers, ARRAY_SIZE(xfers)); if (err) goto acc_spi_read_error; memcpy(data, tb->rx_buf, len); mutex_unlock(&tb->buf_lock); return len; acc_spi_read_error: mutex_unlock(&tb->buf_lock); return err; }

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static int st_sensors_spi_read_byte(struct st_sensor_transfer_buffer *tb, struct device *dev, u8 reg_addr, u8 *res_byte) { return st_sensors_spi_read(tb, dev, reg_addr, 1, res_byte, false); }

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static int st_sensors_spi_read_multiple_byte( struct st_sensor_transfer_buffer *tb, struct device *dev, u8 reg_addr, int len, u8 *data, bool multiread_bit) { return st_sensors_spi_read(tb, dev, reg_addr, len, data, multiread_bit); }

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static int st_sensors_spi_write_byte(struct st_sensor_transfer_buffer *tb, struct device *dev, u8 reg_addr, u8 data) { int err; struct spi_transfer xfers = { .tx_buf = tb->tx_buf, .bits_per_word = 8, .len = 2, }; mutex_lock(&tb->buf_lock); tb->tx_buf[0] = reg_addr; tb->tx_buf[1] = data; err = spi_sync_transfer(to_spi_device(dev), &xfers, 1); mutex_unlock(&tb->buf_lock); return err; }

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static const struct st_sensor_transfer_function st_sensors_tf_spi = { .read_byte = st_sensors_spi_read_byte, .write_byte = st_sensors_spi_write_byte, .read_multiple_byte = st_sensors_spi_read_multiple_byte, };
void st_sensors_spi_configure(struct iio_dev *indio_dev, struct spi_device *spi, struct st_sensor_data *sdata) { spi_set_drvdata(spi, indio_dev); indio_dev->dev.parent = &spi->dev; indio_dev->name = spi->modalias; sdata->dev = &spi->dev; sdata->tf = &st_sensors_tf_spi; sdata->get_irq_data_ready = st_sensors_spi_get_irq; }

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EXPORT_SYMBOL(st_sensors_spi_configure); MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>"); MODULE_DESCRIPTION("STMicroelectronics ST-sensors spi driver"); MODULE_LICENSE("GPL v2");

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