338 lines
8.1 KiB
C
338 lines
8.1 KiB
C
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/**
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* BMA220 Digital triaxial acceleration sensor driver
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*
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* Copyright (c) 2016, Intel Corporation.
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*
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* This file is subject to the terms and conditions of version 2 of
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* the GNU General Public License. See the file COPYING in the main
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* directory of this archive for more details.
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*/
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#include <linux/acpi.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/spi/spi.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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#define BMA220_REG_ID 0x00
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#define BMA220_REG_ACCEL_X 0x02
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#define BMA220_REG_ACCEL_Y 0x03
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#define BMA220_REG_ACCEL_Z 0x04
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#define BMA220_REG_RANGE 0x11
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#define BMA220_REG_SUSPEND 0x18
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#define BMA220_CHIP_ID 0xDD
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#define BMA220_READ_MASK 0x80
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#define BMA220_RANGE_MASK 0x03
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#define BMA220_DATA_SHIFT 2
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#define BMA220_SUSPEND_SLEEP 0xFF
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#define BMA220_SUSPEND_WAKE 0x00
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#define BMA220_DEVICE_NAME "bma220"
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#define BMA220_SCALE_AVAILABLE "0.623 1.248 2.491 4.983"
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#define BMA220_ACCEL_CHANNEL(index, reg, axis) { \
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.type = IIO_ACCEL, \
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.address = reg, \
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.modified = 1, \
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.channel2 = IIO_MOD_##axis, \
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
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.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
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.scan_index = index, \
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.scan_type = { \
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.sign = 's', \
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.realbits = 6, \
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.storagebits = 8, \
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.shift = BMA220_DATA_SHIFT, \
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.endianness = IIO_CPU, \
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}, \
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}
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enum bma220_axis {
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AXIS_X,
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AXIS_Y,
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AXIS_Z,
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};
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static IIO_CONST_ATTR(in_accel_scale_available, BMA220_SCALE_AVAILABLE);
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static struct attribute *bma220_attributes[] = {
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&iio_const_attr_in_accel_scale_available.dev_attr.attr,
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NULL,
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};
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static const struct attribute_group bma220_attribute_group = {
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.attrs = bma220_attributes,
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};
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static const int bma220_scale_table[][4] = {
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{0, 623000}, {1, 248000}, {2, 491000}, {4, 983000}
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};
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struct bma220_data {
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struct spi_device *spi_device;
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struct mutex lock;
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s8 buffer[16]; /* 3x8-bit channels + 5x8 padding + 8x8 timestamp */
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u8 tx_buf[2] ____cacheline_aligned;
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};
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static const struct iio_chan_spec bma220_channels[] = {
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BMA220_ACCEL_CHANNEL(0, BMA220_REG_ACCEL_X, X),
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BMA220_ACCEL_CHANNEL(1, BMA220_REG_ACCEL_Y, Y),
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BMA220_ACCEL_CHANNEL(2, BMA220_REG_ACCEL_Z, Z),
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IIO_CHAN_SOFT_TIMESTAMP(3),
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};
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static inline int bma220_read_reg(struct spi_device *spi, u8 reg)
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{
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return spi_w8r8(spi, reg | BMA220_READ_MASK);
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}
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static const unsigned long bma220_accel_scan_masks[] = {
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BIT(AXIS_X) | BIT(AXIS_Y) | BIT(AXIS_Z),
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0
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};
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static irqreturn_t bma220_trigger_handler(int irq, void *p)
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{
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int ret;
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struct iio_poll_func *pf = p;
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struct iio_dev *indio_dev = pf->indio_dev;
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struct bma220_data *data = iio_priv(indio_dev);
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struct spi_device *spi = data->spi_device;
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mutex_lock(&data->lock);
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data->tx_buf[0] = BMA220_REG_ACCEL_X | BMA220_READ_MASK;
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ret = spi_write_then_read(spi, data->tx_buf, 1, data->buffer,
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ARRAY_SIZE(bma220_channels) - 1);
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if (ret < 0)
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goto err;
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iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
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pf->timestamp);
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err:
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mutex_unlock(&data->lock);
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iio_trigger_notify_done(indio_dev->trig);
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return IRQ_HANDLED;
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}
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static int bma220_read_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int *val, int *val2, long mask)
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{
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int ret;
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u8 range_idx;
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struct bma220_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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ret = bma220_read_reg(data->spi_device, chan->address);
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if (ret < 0)
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return -EINVAL;
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*val = sign_extend32(ret >> BMA220_DATA_SHIFT, 5);
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return IIO_VAL_INT;
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case IIO_CHAN_INFO_SCALE:
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ret = bma220_read_reg(data->spi_device, BMA220_REG_RANGE);
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if (ret < 0)
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return ret;
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range_idx = ret & BMA220_RANGE_MASK;
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*val = bma220_scale_table[range_idx][0];
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*val2 = bma220_scale_table[range_idx][1];
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return IIO_VAL_INT_PLUS_MICRO;
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}
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return -EINVAL;
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}
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static int bma220_write_raw(struct iio_dev *indio_dev,
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struct iio_chan_spec const *chan,
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int val, int val2, long mask)
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{
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int i;
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int ret;
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int index = -1;
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struct bma220_data *data = iio_priv(indio_dev);
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switch (mask) {
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case IIO_CHAN_INFO_SCALE:
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for (i = 0; i < ARRAY_SIZE(bma220_scale_table); i++)
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if (val == bma220_scale_table[i][0] &&
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val2 == bma220_scale_table[i][1]) {
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index = i;
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break;
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}
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if (index < 0)
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return -EINVAL;
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mutex_lock(&data->lock);
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data->tx_buf[0] = BMA220_REG_RANGE;
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data->tx_buf[1] = index;
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ret = spi_write(data->spi_device, data->tx_buf,
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sizeof(data->tx_buf));
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if (ret < 0)
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dev_err(&data->spi_device->dev,
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"failed to set measurement range\n");
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mutex_unlock(&data->lock);
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return 0;
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}
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return -EINVAL;
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}
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static const struct iio_info bma220_info = {
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.read_raw = bma220_read_raw,
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.write_raw = bma220_write_raw,
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.attrs = &bma220_attribute_group,
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};
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static int bma220_init(struct spi_device *spi)
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{
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int ret;
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ret = bma220_read_reg(spi, BMA220_REG_ID);
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if (ret != BMA220_CHIP_ID)
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return -ENODEV;
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/* Make sure the chip is powered on */
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ret = bma220_read_reg(spi, BMA220_REG_SUSPEND);
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if (ret < 0)
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return ret;
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else if (ret == BMA220_SUSPEND_WAKE)
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return bma220_read_reg(spi, BMA220_REG_SUSPEND);
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return 0;
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}
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static int bma220_deinit(struct spi_device *spi)
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{
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int ret;
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/* Make sure the chip is powered off */
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ret = bma220_read_reg(spi, BMA220_REG_SUSPEND);
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if (ret < 0)
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return ret;
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else if (ret == BMA220_SUSPEND_SLEEP)
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return bma220_read_reg(spi, BMA220_REG_SUSPEND);
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return 0;
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}
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static int bma220_probe(struct spi_device *spi)
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{
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int ret;
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struct iio_dev *indio_dev;
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struct bma220_data *data;
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indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*data));
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if (!indio_dev) {
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dev_err(&spi->dev, "iio allocation failed!\n");
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return -ENOMEM;
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}
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data = iio_priv(indio_dev);
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data->spi_device = spi;
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spi_set_drvdata(spi, indio_dev);
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mutex_init(&data->lock);
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indio_dev->dev.parent = &spi->dev;
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indio_dev->info = &bma220_info;
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indio_dev->name = BMA220_DEVICE_NAME;
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indio_dev->modes = INDIO_DIRECT_MODE;
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indio_dev->channels = bma220_channels;
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indio_dev->num_channels = ARRAY_SIZE(bma220_channels);
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indio_dev->available_scan_masks = bma220_accel_scan_masks;
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ret = bma220_init(data->spi_device);
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if (ret < 0)
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return ret;
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ret = iio_triggered_buffer_setup(indio_dev, iio_pollfunc_store_time,
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bma220_trigger_handler, NULL);
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if (ret < 0) {
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dev_err(&spi->dev, "iio triggered buffer setup failed\n");
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goto err_suspend;
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}
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ret = iio_device_register(indio_dev);
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if (ret < 0) {
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dev_err(&spi->dev, "iio_device_register failed\n");
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iio_triggered_buffer_cleanup(indio_dev);
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goto err_suspend;
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}
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return 0;
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err_suspend:
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return bma220_deinit(spi);
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}
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static int bma220_remove(struct spi_device *spi)
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{
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struct iio_dev *indio_dev = spi_get_drvdata(spi);
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iio_device_unregister(indio_dev);
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iio_triggered_buffer_cleanup(indio_dev);
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return bma220_deinit(spi);
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}
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#ifdef CONFIG_PM_SLEEP
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static int bma220_suspend(struct device *dev)
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{
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struct bma220_data *data =
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iio_priv(spi_get_drvdata(to_spi_device(dev)));
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/* The chip can be suspended/woken up by a simple register read. */
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return bma220_read_reg(data->spi_device, BMA220_REG_SUSPEND);
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}
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static int bma220_resume(struct device *dev)
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{
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struct bma220_data *data =
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iio_priv(spi_get_drvdata(to_spi_device(dev)));
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return bma220_read_reg(data->spi_device, BMA220_REG_SUSPEND);
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}
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static SIMPLE_DEV_PM_OPS(bma220_pm_ops, bma220_suspend, bma220_resume);
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#define BMA220_PM_OPS (&bma220_pm_ops)
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#else
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#define BMA220_PM_OPS NULL
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#endif
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static const struct spi_device_id bma220_spi_id[] = {
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{"bma220", 0},
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{}
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};
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static const struct acpi_device_id bma220_acpi_id[] = {
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{"BMA0220", 0},
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{}
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};
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MODULE_DEVICE_TABLE(spi, bma220_spi_id);
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static struct spi_driver bma220_driver = {
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.driver = {
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.name = "bma220_spi",
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.pm = BMA220_PM_OPS,
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.acpi_match_table = ACPI_PTR(bma220_acpi_id),
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},
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.probe = bma220_probe,
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.remove = bma220_remove,
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.id_table = bma220_spi_id,
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};
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module_spi_driver(bma220_driver);
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MODULE_AUTHOR("Tiberiu Breana <tiberiu.a.breana@intel.com>");
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MODULE_DESCRIPTION("BMA220 acceleration sensor driver");
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MODULE_LICENSE("GPL v2");
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