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alistair23-linux/drivers/staging/iio/dac/ad5791.c
Lars-Peter Clausen 7cbb753701 staging:iio: Streamline API function naming 
Currently we use two different naming schemes in the IIO API, iio_verb_object
and iio_object_verb. E.g iio_device_register and iio_allocate_device. This
patches renames instances of the later to the former. The patch also renames allocate to
alloc as this seems to be the preferred form throughout the kernel.

In particular the following renames are performed by the patch:
	iio_put_device -> iio_device_put
	iio_allocate_device -> iio_device_alloc
	iio_free_device -> iio_device_free
	iio_get_trigger -> iio_trigger_get
	iio_put_trigger -> iio_trigger_put
	iio_allocate_trigger -> iio_trigger_alloc
	iio_free_trigger -> iio_trigger_free

The conversion was done with the following coccinelle patch with manual fixes to
comments and documentation.

<smpl>
@@
@@
-iio_put_device
+iio_device_put
@@
@@
-iio_allocate_device
+iio_device_alloc
@@
@@
-iio_free_device
+iio_device_free
@@
@@
-iio_get_trigger
+iio_trigger_get
@@
@@
-iio_put_trigger
+iio_trigger_put
@@
@@
-iio_allocate_trigger
+iio_trigger_alloc
@@
@@
-iio_free_trigger
+iio_trigger_free
</smpl>

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-04-29 21:23:49 -04:00

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/*
* AD5760, AD5780, AD5781, AD5790, AD5791 Voltage Output Digital to Analog
* Converter
*
* Copyright 2011 Analog Devices Inc.
*
* Licensed under the GPL-2.
*/
#include <linux/interrupt.h>
#include <linux/fs.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/regulator/consumer.h>
#include <linux/module.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include "dac.h"
#include "ad5791.h"
static int ad5791_spi_write(struct spi_device *spi, u8 addr, u32 val)
{
union {
u32 d32;
u8 d8[4];
} data;
data.d32 = cpu_to_be32(AD5791_CMD_WRITE |
AD5791_ADDR(addr) |
(val & AD5791_DAC_MASK));
return spi_write(spi, &data.d8[1], 3);
}
static int ad5791_spi_read(struct spi_device *spi, u8 addr, u32 *val)
{
union {
u32 d32;
u8 d8[4];
} data[3];
int ret;
struct spi_message msg;
struct spi_transfer xfers[] = {
{
.tx_buf = &data[0].d8[1],
.bits_per_word = 8,
.len = 3,
.cs_change = 1,
}, {
.tx_buf = &data[1].d8[1],
.rx_buf = &data[2].d8[1],
.bits_per_word = 8,
.len = 3,
},
};
data[0].d32 = cpu_to_be32(AD5791_CMD_READ |
AD5791_ADDR(addr));
data[1].d32 = cpu_to_be32(AD5791_ADDR(AD5791_ADDR_NOOP));
spi_message_init(&msg);
spi_message_add_tail(&xfers[0], &msg);
spi_message_add_tail(&xfers[1], &msg);
ret = spi_sync(spi, &msg);
*val = be32_to_cpu(data[2].d32);
return ret;
}
#define AD5791_CHAN(bits, shift) { \
.type = IIO_VOLTAGE, \
.output = 1, \
.indexed = 1, \
.address = AD5791_ADDR_DAC0, \
.channel = 0, \
.info_mask = IIO_CHAN_INFO_RAW_SEPARATE_BIT | \
IIO_CHAN_INFO_SCALE_SHARED_BIT | \
IIO_CHAN_INFO_OFFSET_SHARED_BIT, \
.scan_type = IIO_ST('u', bits, 24, shift) \
}
static const struct iio_chan_spec ad5791_channels[] = {
[ID_AD5760] = AD5791_CHAN(16, 4),
[ID_AD5780] = AD5791_CHAN(18, 2),
[ID_AD5781] = AD5791_CHAN(18, 2),
[ID_AD5791] = AD5791_CHAN(20, 0)
};
static ssize_t ad5791_read_powerdown_mode(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5791_state *st = iio_priv(indio_dev);
const char mode[][14] = {"6kohm_to_gnd", "three_state"};
return sprintf(buf, "%s\n", mode[st->pwr_down_mode]);
}
static ssize_t ad5791_write_powerdown_mode(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5791_state *st = iio_priv(indio_dev);
int ret;
if (sysfs_streq(buf, "6kohm_to_gnd"))
st->pwr_down_mode = AD5791_DAC_PWRDN_6K;
else if (sysfs_streq(buf, "three_state"))
st->pwr_down_mode = AD5791_DAC_PWRDN_3STATE;
else
ret = -EINVAL;
return ret ? ret : len;
}
static ssize_t ad5791_read_dac_powerdown(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5791_state *st = iio_priv(indio_dev);
return sprintf(buf, "%d\n", st->pwr_down);
}
static ssize_t ad5791_write_dac_powerdown(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t len)
{
long readin;
int ret;
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct ad5791_state *st = iio_priv(indio_dev);
ret = strict_strtol(buf, 10, &readin);
if (ret)
return ret;
if (readin == 0) {
st->pwr_down = false;
st->ctrl &= ~(AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI);
} else if (readin == 1) {
st->pwr_down = true;
if (st->pwr_down_mode == AD5791_DAC_PWRDN_6K)
st->ctrl |= AD5791_CTRL_OPGND;
else if (st->pwr_down_mode == AD5791_DAC_PWRDN_3STATE)
st->ctrl |= AD5791_CTRL_DACTRI;
} else
ret = -EINVAL;
ret = ad5791_spi_write(st->spi, AD5791_ADDR_CTRL, st->ctrl);
return ret ? ret : len;
}
static IIO_DEVICE_ATTR(out_voltage_powerdown_mode, S_IRUGO |
S_IWUSR, ad5791_read_powerdown_mode,
ad5791_write_powerdown_mode, 0);
static IIO_CONST_ATTR(out_voltage_powerdown_mode_available,
"6kohm_to_gnd three_state");
#define IIO_DEV_ATTR_DAC_POWERDOWN(_num, _show, _store, _addr) \
IIO_DEVICE_ATTR(out_voltage##_num##_powerdown, \
S_IRUGO | S_IWUSR, _show, _store, _addr)
static IIO_DEV_ATTR_DAC_POWERDOWN(0, ad5791_read_dac_powerdown,
ad5791_write_dac_powerdown, 0);
static struct attribute *ad5791_attributes[] = {
&iio_dev_attr_out_voltage0_powerdown.dev_attr.attr,
&iio_dev_attr_out_voltage_powerdown_mode.dev_attr.attr,
&iio_const_attr_out_voltage_powerdown_mode_available.dev_attr.attr,
NULL,
};
static const struct attribute_group ad5791_attribute_group = {
.attrs = ad5791_attributes,
};
static int ad5791_get_lin_comp(unsigned int span)
{
if (span <= 10000)
return AD5791_LINCOMP_0_10;
else if (span <= 12000)
return AD5791_LINCOMP_10_12;
else if (span <= 16000)
return AD5791_LINCOMP_12_16;
else if (span <= 19000)
return AD5791_LINCOMP_16_19;
else
return AD5791_LINCOMP_19_20;
}
static int ad5780_get_lin_comp(unsigned int span)
{
if (span <= 10000)
return AD5780_LINCOMP_0_10;
else
return AD5780_LINCOMP_10_20;
}
static const struct ad5791_chip_info ad5791_chip_info_tbl[] = {
[ID_AD5760] = {
.get_lin_comp = ad5780_get_lin_comp,
},
[ID_AD5780] = {
.get_lin_comp = ad5780_get_lin_comp,
},
[ID_AD5781] = {
.get_lin_comp = ad5791_get_lin_comp,
},
[ID_AD5791] = {
.get_lin_comp = ad5791_get_lin_comp,
},
};
static int ad5791_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val,
int *val2,
long m)
{
struct ad5791_state *st = iio_priv(indio_dev);
u64 val64;
int ret;
switch (m) {
case IIO_CHAN_INFO_RAW:
ret = ad5791_spi_read(st->spi, chan->address, val);
if (ret)
return ret;
*val &= AD5791_DAC_MASK;
*val >>= chan->scan_type.shift;
return IIO_VAL_INT;
case IIO_CHAN_INFO_SCALE:
*val = 0;
*val2 = (((u64)st->vref_mv) * 1000000ULL) >> chan->scan_type.realbits;
return IIO_VAL_INT_PLUS_MICRO;
case IIO_CHAN_INFO_OFFSET:
val64 = (((u64)st->vref_neg_mv) << chan->scan_type.realbits);
do_div(val64, st->vref_mv);
*val = -val64;
return IIO_VAL_INT;
default:
return -EINVAL;
}
};
static int ad5791_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val,
int val2,
long mask)
{
struct ad5791_state *st = iio_priv(indio_dev);
switch (mask) {
case IIO_CHAN_INFO_RAW:
val &= AD5791_RES_MASK(chan->scan_type.realbits);
val <<= chan->scan_type.shift;
return ad5791_spi_write(st->spi, chan->address, val);
default:
return -EINVAL;
}
}
static const struct iio_info ad5791_info = {
.read_raw = &ad5791_read_raw,
.write_raw = &ad5791_write_raw,
.attrs = &ad5791_attribute_group,
.driver_module = THIS_MODULE,
};
static int __devinit ad5791_probe(struct spi_device *spi)
{
struct ad5791_platform_data *pdata = spi->dev.platform_data;
struct iio_dev *indio_dev;
struct ad5791_state *st;
int ret, pos_voltage_uv = 0, neg_voltage_uv = 0;
indio_dev = iio_device_alloc(sizeof(*st));
if (indio_dev == NULL) {
ret = -ENOMEM;
goto error_ret;
}
st = iio_priv(indio_dev);
st->reg_vdd = regulator_get(&spi->dev, "vdd");
if (!IS_ERR(st->reg_vdd)) {
ret = regulator_enable(st->reg_vdd);
if (ret)
goto error_put_reg_pos;
pos_voltage_uv = regulator_get_voltage(st->reg_vdd);
}
st->reg_vss = regulator_get(&spi->dev, "vss");
if (!IS_ERR(st->reg_vss)) {
ret = regulator_enable(st->reg_vss);
if (ret)
goto error_put_reg_neg;
neg_voltage_uv = regulator_get_voltage(st->reg_vss);
}
st->pwr_down = true;
st->spi = spi;
if (!IS_ERR(st->reg_vss) && !IS_ERR(st->reg_vdd)) {
st->vref_mv = (pos_voltage_uv + neg_voltage_uv) / 1000;
st->vref_neg_mv = neg_voltage_uv / 1000;
} else if (pdata) {
st->vref_mv = pdata->vref_pos_mv + pdata->vref_neg_mv;
st->vref_neg_mv = pdata->vref_neg_mv;
} else {
dev_warn(&spi->dev, "reference voltage unspecified\n");
}
ret = ad5791_spi_write(spi, AD5791_ADDR_SW_CTRL, AD5791_SWCTRL_RESET);
if (ret)
goto error_disable_reg_neg;
st->chip_info = &ad5791_chip_info_tbl[spi_get_device_id(spi)
->driver_data];
st->ctrl = AD5761_CTRL_LINCOMP(st->chip_info->get_lin_comp(st->vref_mv))
| ((pdata && pdata->use_rbuf_gain2) ? 0 : AD5791_CTRL_RBUF) |
AD5791_CTRL_BIN2SC;
ret = ad5791_spi_write(spi, AD5791_ADDR_CTRL, st->ctrl |
AD5791_CTRL_OPGND | AD5791_CTRL_DACTRI);
if (ret)
goto error_disable_reg_neg;
spi_set_drvdata(spi, indio_dev);
indio_dev->dev.parent = &spi->dev;
indio_dev->info = &ad5791_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->channels
= &ad5791_channels[spi_get_device_id(spi)->driver_data];
indio_dev->num_channels = 1;
indio_dev->name = spi_get_device_id(st->spi)->name;
ret = iio_device_register(indio_dev);
if (ret)
goto error_disable_reg_neg;
return 0;
error_disable_reg_neg:
if (!IS_ERR(st->reg_vss))
regulator_disable(st->reg_vss);
error_put_reg_neg:
if (!IS_ERR(st->reg_vss))
regulator_put(st->reg_vss);
if (!IS_ERR(st->reg_vdd))
regulator_disable(st->reg_vdd);
error_put_reg_pos:
if (!IS_ERR(st->reg_vdd))
regulator_put(st->reg_vdd);
iio_device_free(indio_dev);
error_ret:
return ret;
}
static int __devexit ad5791_remove(struct spi_device *spi)
{
struct iio_dev *indio_dev = spi_get_drvdata(spi);
struct ad5791_state *st = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
if (!IS_ERR(st->reg_vdd)) {
regulator_disable(st->reg_vdd);
regulator_put(st->reg_vdd);
}
if (!IS_ERR(st->reg_vss)) {
regulator_disable(st->reg_vss);
regulator_put(st->reg_vss);
}
iio_device_free(indio_dev);
return 0;
}
static const struct spi_device_id ad5791_id[] = {
{"ad5760", ID_AD5760},
{"ad5780", ID_AD5780},
{"ad5781", ID_AD5781},
{"ad5790", ID_AD5791},
{"ad5791", ID_AD5791},
{}
};
MODULE_DEVICE_TABLE(spi, ad5791_id);
static struct spi_driver ad5791_driver = {
.driver = {
.name = "ad5791",
.owner = THIS_MODULE,
},
.probe = ad5791_probe,
.remove = __devexit_p(ad5791_remove),
.id_table = ad5791_id,
};
module_spi_driver(ad5791_driver);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Analog Devices AD5760/AD5780/AD5781/AD5790/AD5791 DAC");
MODULE_LICENSE("GPL v2");
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