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/*
* Copyright (C) 2012 Invensense, Inc.
*
* This software is licensed under the terms of the GNU General Public
* License version 2, as published by the Free Software Foundation, and
* may be copied, distributed, and modified under those terms.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
/**
* @addtogroup DRIVERS
* @brief Hardware drivers.
*
* @{
* @file inv_ami306_ring.c
* @brief Invensense implementation for AMI306
* @details This driver currently works for the AMI306
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/sysfs.h>
#include <linux/jiffies.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/kfifo.h>
#include <linux/poll.h>
#include <linux/miscdevice.h>
#include "iio.h"
#include "kfifo_buf.h"
#include "trigger_consumer.h"
#include "sysfs.h"
#include "inv_ami306_iio.h"
static int put_scan_to_buf(struct iio_dev *indio_dev, unsigned char *d,
short *s, int scan_index) {
struct iio_buffer *ring = indio_dev->buffer;
int st;
int i, d_ind;
d_ind = 0;
for (i = 0; i < 3; i++) {
st = iio_scan_mask_query(indio_dev, ring, scan_index + i);
if (st) {
memcpy(&d[d_ind], &s[i], sizeof(s[i]));
d_ind += sizeof(s[i]);
}
}
return d_ind;
}
/**
* inv_read_fifo() - Transfer data from FIFO to ring buffer.
*/
int inv_read_ami306_fifo(struct iio_dev *indio_dev)
{
struct inv_ami306_state_s *st = iio_priv(indio_dev);
struct iio_buffer *ring = indio_dev->buffer;
int result, status, d_ind;
char b;
char *tmp;
s64 tmp_buf[2];
result = i2c_smbus_read_i2c_block_data(st->i2c, REG_AMI_STA1, 1, &b);
if (result < 0)
goto end_session;
if (b & AMI_STA1_DRDY_BIT) {
status = ami306_read_raw_data(st, st->compass_data);
if (status) {
pr_err("error reading raw\n");
goto end_session;
}
tmp = (unsigned char *)tmp_buf;
d_ind = put_scan_to_buf(indio_dev, tmp, st->compass_data,
INV_AMI306_SCAN_MAGN_X);
if (ring->scan_timestamp)
tmp_buf[(d_ind + 7)/8] = st->timestamp;
ring->access->store_to(indio_dev->buffer, tmp, st->timestamp);
} else if (b & AMI_STA1_DOR_BIT)
pr_err("not ready\n");
end_session:
b = AMI_CTRL3_FORCE_BIT;
result = i2c_smbus_write_i2c_block_data(st->i2c, REG_AMI_CTRL3, 1, &b);
return IRQ_HANDLED;
}
void inv_ami306_unconfigure_ring(struct iio_dev *indio_dev)
{
iio_kfifo_free(indio_dev->buffer);
};
static int inv_ami306_postenable(struct iio_dev *indio_dev)
{
struct inv_ami306_state_s *st = iio_priv(indio_dev);
struct iio_buffer *ring = indio_dev->buffer;
int result;
/* when all the outputs are disabled, even though buffer/enable is on,
do nothing */
if (!(iio_scan_mask_query(indio_dev, ring, INV_AMI306_SCAN_MAGN_X) ||
iio_scan_mask_query(indio_dev, ring, INV_AMI306_SCAN_MAGN_Y) ||
iio_scan_mask_query(indio_dev, ring, INV_AMI306_SCAN_MAGN_Z)))
return 0;
result = set_ami306_enable(indio_dev, true);
if (result)
return result;
schedule_delayed_work(&st->work, msecs_to_jiffies(st->delay));
return 0;
}
static int inv_ami306_predisable(struct iio_dev *indio_dev)
{
struct iio_buffer *ring = indio_dev->buffer;
struct inv_ami306_state_s *st = iio_priv(indio_dev);
cancel_delayed_work_sync(&st->work);
clear_bit(INV_AMI306_SCAN_MAGN_X, ring->scan_mask);
clear_bit(INV_AMI306_SCAN_MAGN_Y, ring->scan_mask);
clear_bit(INV_AMI306_SCAN_MAGN_Z, ring->scan_mask);
return 0;
}
static const struct iio_buffer_setup_ops inv_ami306_ring_setup_ops = {
.preenable = &iio_sw_buffer_preenable,
.postenable = &inv_ami306_postenable,
.predisable = &inv_ami306_predisable,
};
int inv_ami306_configure_ring(struct iio_dev *indio_dev)
{
int ret = 0;
struct iio_buffer *ring;
ring = iio_kfifo_allocate(indio_dev);
if (!ring) {
ret = -ENOMEM;
return ret;
}
indio_dev->buffer = ring;
/* setup ring buffer */
ring->scan_timestamp = true;
indio_dev->setup_ops = &inv_ami306_ring_setup_ops;
indio_dev->modes |= INDIO_BUFFER_TRIGGERED;
return 0;
}
/**
* @}
*/
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