tmp_suning_uos_patched/drivers/iio/adc/ad7887.c
Jonathan Cameron e39d99059a iio:adc:ad7887 Fix channel reported endianness from cpu to big endian
Note this also sets the endianness to big endian whereas it would
previously have defaulted to the cpu endian.  Hence technically
this is a bug fix on LE platforms.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Cc: stable@vger.kernel.org
2013-12-17 20:37:14 +00:00

371 lines
8.7 KiB
C

/*
* AD7887 SPI ADC driver
*
* Copyright 2010-2011 Analog Devices Inc.
*
* Licensed under the GPL-2.
*/
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/spi/spi.h>
#include <linux/regulator/consumer.h>
#include <linux/err.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/platform_data/ad7887.h>
#define AD7887_REF_DIS (1 << 5) /* on-chip reference disable */
#define AD7887_DUAL (1 << 4) /* dual-channel mode */
#define AD7887_CH_AIN1 (1 << 3) /* convert on channel 1, DUAL=1 */
#define AD7887_CH_AIN0 (0 << 3) /* convert on channel 0, DUAL=0,1 */
#define AD7887_PM_MODE1 (0) /* CS based shutdown */
#define AD7887_PM_MODE2 (1) /* full on */
#define AD7887_PM_MODE3 (2) /* auto shutdown after conversion */
#define AD7887_PM_MODE4 (3) /* standby mode */
enum ad7887_channels {
AD7887_CH0,
AD7887_CH0_CH1,
AD7887_CH1,
};
#define RES_MASK(bits) ((1 << (bits)) - 1)
/**
* struct ad7887_chip_info - chip specifc information
* @int_vref_mv: the internal reference voltage
* @channel: channel specification
*/
struct ad7887_chip_info {
u16 int_vref_mv;
struct iio_chan_spec channel[3];
};
struct ad7887_state {
struct spi_device *spi;
const struct ad7887_chip_info *chip_info;
struct regulator *reg;
struct spi_transfer xfer[4];
struct spi_message msg[3];
struct spi_message *ring_msg;
unsigned char tx_cmd_buf[4];
/*
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
* Buffer needs to be large enough to hold two 16 bit samples and a
* 64 bit aligned 64 bit timestamp.
*/
unsigned char data[ALIGN(4, sizeof(s64)) + sizeof(s64)]
____cacheline_aligned;
};
enum ad7887_supported_device_ids {
ID_AD7887
};
static int ad7887_ring_preenable(struct iio_dev *indio_dev)
{
struct ad7887_state *st = iio_priv(indio_dev);
/* We know this is a single long so can 'cheat' */
switch (*indio_dev->active_scan_mask) {
case (1 << 0):
st->ring_msg = &st->msg[AD7887_CH0];
break;
case (1 << 1):
st->ring_msg = &st->msg[AD7887_CH1];
/* Dummy read: push CH1 setting down to hardware */
spi_sync(st->spi, st->ring_msg);
break;
case ((1 << 1) | (1 << 0)):
st->ring_msg = &st->msg[AD7887_CH0_CH1];
break;
}
return 0;
}
static int ad7887_ring_postdisable(struct iio_dev *indio_dev)
{
struct ad7887_state *st = iio_priv(indio_dev);
/* dummy read: restore default CH0 settin */
return spi_sync(st->spi, &st->msg[AD7887_CH0]);
}
/**
* ad7887_trigger_handler() bh of trigger launched polling to ring buffer
*
* Currently there is no option in this driver to disable the saving of
* timestamps within the ring.
**/
static irqreturn_t ad7887_trigger_handler(int irq, void *p)
{
struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct ad7887_state *st = iio_priv(indio_dev);
int b_sent;
b_sent = spi_sync(st->spi, st->ring_msg);
if (b_sent)
goto done;
iio_push_to_buffers_with_timestamp(indio_dev, st->data,
iio_get_time_ns());
done:
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static const struct iio_buffer_setup_ops ad7887_ring_setup_ops = {
.preenable = &ad7887_ring_preenable,
.postenable = &iio_triggered_buffer_postenable,
.predisable = &iio_triggered_buffer_predisable,
.postdisable = &ad7887_ring_postdisable,
};
static int ad7887_scan_direct(struct ad7887_state *st, unsigned ch)
{
int ret = spi_sync(st->spi, &st->msg[ch]);
if (ret)
return ret;
return (st->data[(ch * 2)] << 8) | st->data[(ch * 2) + 1];
}
static int ad7887_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
int *val2,
long m)
{
int ret;
struct ad7887_state *st = iio_priv(indio_dev);
switch (m) {
case IIO_CHAN_INFO_RAW:
mutex_lock(&indio_dev->mlock);
if (iio_buffer_enabled(indio_dev))
ret = -EBUSY;
else
ret = ad7887_scan_direct(st, chan->address);
mutex_unlock(&indio_dev->mlock);
if (ret < 0)
return ret;
*val = ret >> chan->scan_type.shift;
*val &= RES_MASK(chan->scan_type.realbits);
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
if (st->reg) {
*val = regulator_get_voltage(st->reg);
if (*val < 0)
return *val;
*val /= 1000;
} else {
*val = st->chip_info->int_vref_mv;
}
*val2 = chan->scan_type.realbits;
return IIO_VAL_FRACTIONAL_LOG2;
}
return -EINVAL;
}
static const struct ad7887_chip_info ad7887_chip_info_tbl[] = {
/*
* More devices added in future
*/
[ID_AD7887] = {
.channel[0] = {
.type = IIO_VOLTAGE,
.indexed = 1,
.channel = 1,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
.address = 1,
.scan_index = 1,
.scan_type = {
.sign = 'u',
.realbits = 12,
.storagebits = 16,
.shift = 0,
.endianness = IIO_BE,
},
},
.channel[1] = {
.type = IIO_VOLTAGE,
.indexed = 1,
.channel = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
.address = 0,
.scan_index = 0,
.scan_type = {
.sign = 'u',
.realbits = 12,
.storagebits = 16,
.shift = 0,
.endianness = IIO_BE,
},
},
.channel[2] = IIO_CHAN_SOFT_TIMESTAMP(2),
.int_vref_mv = 2500,
},
};
static const struct iio_info ad7887_info = {
.read_raw = &ad7887_read_raw,
.driver_module = THIS_MODULE,
};
static int ad7887_probe(struct spi_device *spi)
{
struct ad7887_platform_data *pdata = spi->dev.platform_data;
struct ad7887_state *st;
struct iio_dev *indio_dev;
uint8_t mode;
int ret;
indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
if (indio_dev == NULL)
return -ENOMEM;
st = iio_priv(indio_dev);
if (!pdata || !pdata->use_onchip_ref) {
st->reg = devm_regulator_get(&spi->dev, "vref");
if (IS_ERR(st->reg))
return PTR_ERR(st->reg);
ret = regulator_enable(st->reg);
if (ret)
return ret;
}
st->chip_info =
&ad7887_chip_info_tbl[spi_get_device_id(spi)->driver_data];
spi_set_drvdata(spi, indio_dev);
st->spi = spi;
/* Estabilish that the iio_dev is a child of the spi device */
indio_dev->dev.parent = &spi->dev;
indio_dev->name = spi_get_device_id(spi)->name;
indio_dev->info = &ad7887_info;
indio_dev->modes = INDIO_DIRECT_MODE;
/* Setup default message */
mode = AD7887_PM_MODE4;
if (!pdata || !pdata->use_onchip_ref)
mode |= AD7887_REF_DIS;
if (pdata && pdata->en_dual)
mode |= AD7887_DUAL;
st->tx_cmd_buf[0] = AD7887_CH_AIN0 | mode;
st->xfer[0].rx_buf = &st->data[0];
st->xfer[0].tx_buf = &st->tx_cmd_buf[0];
st->xfer[0].len = 2;
spi_message_init(&st->msg[AD7887_CH0]);
spi_message_add_tail(&st->xfer[0], &st->msg[AD7887_CH0]);
if (pdata && pdata->en_dual) {
st->tx_cmd_buf[2] = AD7887_CH_AIN1 | mode;
st->xfer[1].rx_buf = &st->data[0];
st->xfer[1].tx_buf = &st->tx_cmd_buf[2];
st->xfer[1].len = 2;
st->xfer[2].rx_buf = &st->data[2];
st->xfer[2].tx_buf = &st->tx_cmd_buf[0];
st->xfer[2].len = 2;
spi_message_init(&st->msg[AD7887_CH0_CH1]);
spi_message_add_tail(&st->xfer[1], &st->msg[AD7887_CH0_CH1]);
spi_message_add_tail(&st->xfer[2], &st->msg[AD7887_CH0_CH1]);
st->xfer[3].rx_buf = &st->data[2];
st->xfer[3].tx_buf = &st->tx_cmd_buf[2];
st->xfer[3].len = 2;
spi_message_init(&st->msg[AD7887_CH1]);
spi_message_add_tail(&st->xfer[3], &st->msg[AD7887_CH1]);
indio_dev->channels = st->chip_info->channel;
indio_dev->num_channels = 3;
} else {
indio_dev->channels = &st->chip_info->channel[1];
indio_dev->num_channels = 2;
}
ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,
&ad7887_trigger_handler, &ad7887_ring_setup_ops);
if (ret)
goto error_disable_reg;
ret = iio_device_register(indio_dev);
if (ret)
goto error_unregister_ring;
return 0;
error_unregister_ring:
iio_triggered_buffer_cleanup(indio_dev);
error_disable_reg:
if (st->reg)
regulator_disable(st->reg);
return ret;
}
static int ad7887_remove(struct spi_device *spi)
{
struct iio_dev *indio_dev = spi_get_drvdata(spi);
struct ad7887_state *st = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
iio_triggered_buffer_cleanup(indio_dev);
if (st->reg)
regulator_disable(st->reg);
return 0;
}
static const struct spi_device_id ad7887_id[] = {
{"ad7887", ID_AD7887},
{}
};
MODULE_DEVICE_TABLE(spi, ad7887_id);
static struct spi_driver ad7887_driver = {
.driver = {
.name = "ad7887",
.owner = THIS_MODULE,
},
.probe = ad7887_probe,
.remove = ad7887_remove,
.id_table = ad7887_id,
};
module_spi_driver(ad7887_driver);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Analog Devices AD7887 ADC");
MODULE_LICENSE("GPL v2");