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staging: iio: adc: new driver for AD7152/3 devices 

Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Barry Song 2010-10-27 21:43:54 -04:00 committed by Greg Kroah-Hartman
parent 54c5be349b
commit a20ebd9300
3 changed files with 618 additions and 0 deletions
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7
drivers/staging/iio/adc/Kconfig
View File

@ -34,6 +34,13 @@ config AD7150
Say yes here to build support for Analog Devices capacitive sensors.
(ad7150, ad7151, ad7156) Provides direct access via sysfs.
config AD7152
tristate "Analog Devices ad7152/3 capacitive sensor driver"
depends on I2C
help
Say yes here to build support for Analog Devices capacitive sensors.
(ad7152, ad7153) Provides direct access via sysfs.
config AD799X
tristate "Analog Devices AD799x ADC driver"
depends on I2C

1
drivers/staging/iio/adc/Makefile
View File

@ -16,3 +16,4 @@ ad7476-$(CONFIG_IIO_RING_BUFFER) += ad7476_ring.o
obj-$(CONFIG_AD7476) += ad7476.o
obj-$(CONFIG_AD7150) += ad7150.o
obj-$(CONFIG_AD7152) += ad7152.o

610
drivers/staging/iio/adc/ad7152.c Normal file
View File

@ -0,0 +1,610 @@
/*
* AD7152 capacitive sensor driver supporting AD7152/3
*
* Copyright 2010 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <linux/interrupt.h>
#include <linux/gpio.h>
#include <linux/workqueue.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/sysfs.h>
#include <linux/list.h>
#include <linux/i2c.h>
#include <linux/rtc.h>
#include "../iio.h"
#include "../sysfs.h"
/*
* AD7152 registers definition
*/
#define AD7152_STATUS 0
#define AD7152_STATUS_RDY1 (1 << 0)
#define AD7152_STATUS_RDY2 (1 << 1)
#define AD7152_CH1_DATA_HIGH 1
#define AD7152_CH1_DATA_LOW 2
#define AD7152_CH2_DATA_HIGH 3
#define AD7152_CH2_DATA_LOW 4
#define AD7152_CH1_OFFS_HIGH 5
#define AD7152_CH1_OFFS_LOW 6
#define AD7152_CH2_OFFS_HIGH 7
#define AD7152_CH2_OFFS_LOW 8
#define AD7152_CH1_GAIN_HIGH 9
#define AD7152_CH1_GAIN_LOW 10
#define AD7152_CH1_SETUP 11
#define AD7152_CH2_GAIN_HIGH 12
#define AD7152_CH2_GAIN_LOW 13
#define AD7152_CH2_SETUP 14
#define AD7152_CFG 15
#define AD7152_RESEVERD 16
#define AD7152_CAPDAC_POS 17
#define AD7152_CAPDAC_NEG 18
#define AD7152_CFG2 26
#define AD7152_MAX_CONV_MODE 6
/*
* struct ad7152_chip_info - chip specifc information
*/
struct ad7152_chip_info {
const char *name;
struct i2c_client *client;
struct iio_dev *indio_dev;
u16 ch1_offset; /* Channel 1 offset calibration coefficient */
u16 ch1_gain; /* Channel 1 gain coefficient */
u8 ch1_setup;
u16 ch2_offset; /* Channel 2 offset calibration coefficient */
u16 ch2_gain; /* Channel 1 gain coefficient */
u8 ch2_setup;
u8 filter_rate_setup; /* Capacitive channel digital filter setup; conversion time/update rate setup per channel */
char *conversion_mode;
};
struct ad7152_conversion_mode {
char *name;
u8 reg_cfg;
};
struct ad7152_conversion_mode ad7152_conv_mode_table[AD7152_MAX_CONV_MODE] = {
{ "idle", 0 },
{ "continuous-conversion", 1 },
{ "single-conversion", 2 },
{ "power-down", 3 },
{ "offset-calibration", 5 },
{ "gain-calibration", 6 },
};
/*
* ad7152 register access by I2C
*/
static int ad7152_i2c_read(struct ad7152_chip_info *chip, u8 reg, u8 *data, int len)
{
struct i2c_client *client = chip->client;
int ret;
ret = i2c_master_send(client, &reg, 1);
if (ret < 0) {
dev_err(&client->dev, "I2C write error\n");
return ret;
}
ret = i2c_master_recv(client, data, len);
if (ret < 0) {
dev_err(&client->dev, "I2C read error\n");
}
return ret;
}
static int ad7152_i2c_write(struct ad7152_chip_info *chip, u8 reg, u8 data)
{
struct i2c_client *client = chip->client;
int ret;
u8 tx[2] = {
reg,
data,
};
ret = i2c_master_send(client, tx, 2);
if (ret < 0)
dev_err(&client->dev, "I2C write error\n");
return ret;
}
/*
* sysfs nodes
*/
#define IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(_show) \
IIO_DEVICE_ATTR(available_conversion_modes, S_IRUGO, _show, NULL, 0)
#define IIO_DEV_ATTR_CONVERSION_MODE(_mode, _show, _store) \
IIO_DEVICE_ATTR(conversion_mode, _mode, _show, _store, 0)
#define IIO_DEV_ATTR_CH1_OFFSET(_mode, _show, _store) \
IIO_DEVICE_ATTR(ch1_offset, _mode, _show, _store, 0)
#define IIO_DEV_ATTR_CH2_OFFSET(_mode, _show, _store) \
IIO_DEVICE_ATTR(ch2_offset, _mode, _show, _store, 0)
#define IIO_DEV_ATTR_CH1_GAIN(_mode, _show, _store) \
IIO_DEVICE_ATTR(ch1_gain, _mode, _show, _store, 0)
#define IIO_DEV_ATTR_CH2_GAIN(_mode, _show, _store) \
IIO_DEVICE_ATTR(ch2_gain, _mode, _show, _store, 0)
#define IIO_DEV_ATTR_CH1_VALUE(_show) \
IIO_DEVICE_ATTR(ch1_value, S_IRUGO, _show, NULL, 0)
#define IIO_DEV_ATTR_CH2_VALUE(_show) \
IIO_DEVICE_ATTR(ch2_value, S_IRUGO, _show, NULL, 0)
#define IIO_DEV_ATTR_CH1_SETUP(_mode, _show, _store) \
IIO_DEVICE_ATTR(ch1_setup, _mode, _show, _store, 0)
#define IIO_DEV_ATTR_CH2_SETUP(_mode, _show, _store) \
IIO_DEVICE_ATTR(ch2_setup, _mode, _show, _store, 0)
#define IIO_DEV_ATTR_FILTER_RATE_SETUP(_mode, _show, _store) \
IIO_DEVICE_ATTR(filter_rate_setup, _mode, _show, _store, 0)
static ssize_t ad7152_show_conversion_modes(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int i;
int len = 0;
for (i = 0; i < AD7152_MAX_CONV_MODE; i++)
len += sprintf(buf + len, "%s ", ad7152_conv_mode_table[i].name);
len += sprintf(buf + len, "\n");
return len;
}
static IIO_DEV_ATTR_AVAIL_CONVERSION_MODES(ad7152_show_conversion_modes);
static ssize_t ad7152_show_ch1_value(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = dev_info->dev_data;
u8 data[2];
ad7152_i2c_read(chip, AD7152_CH1_DATA_HIGH, data, 2);
return sprintf(buf, "%d\n", ((int)data[0] << 8) | data[1]);
}
static IIO_DEV_ATTR_CH1_VALUE(ad7152_show_ch1_value);
static ssize_t ad7152_show_ch2_value(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = dev_info->dev_data;
u8 data[2];
ad7152_i2c_read(chip, AD7152_CH2_DATA_HIGH, data, 2);
return sprintf(buf, "%d\n", ((int)data[0] << 8) | data[1]);
}
static IIO_DEV_ATTR_CH2_VALUE(ad7152_show_ch2_value);
static ssize_t ad7152_show_conversion_mode(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "%s\n", chip->conversion_mode);
}
static ssize_t ad7152_store_conversion_mode(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = dev_info->dev_data;
u8 cfg;
int i;
ad7152_i2c_read(chip, AD7152_CFG, &cfg, 1);
for (i = 0; i < AD7152_MAX_CONV_MODE; i++)
if (strncmp(buf, ad7152_conv_mode_table[i].name,
strlen(ad7152_conv_mode_table[i].name) - 1) == 0) {
chip->conversion_mode = ad7152_conv_mode_table[i].name;
cfg |= 0x18 | ad7152_conv_mode_table[i].reg_cfg;
ad7152_i2c_write(chip, AD7152_CFG, cfg);
return len;
}
dev_err(dev, "not supported conversion mode\n");
return -EINVAL;
}
static IIO_DEV_ATTR_CONVERSION_MODE(S_IRUGO | S_IWUSR,
ad7152_show_conversion_mode,
ad7152_store_conversion_mode);
static ssize_t ad7152_show_ch1_offset(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "%d\n", chip->ch1_offset);
}
static ssize_t ad7152_store_ch1_offset(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = dev_info->dev_data;
unsigned long data;
int ret;
ret = strict_strtoul(buf, 10, &data);
if ((!ret) && (data < 0x10000)) {
ad7152_i2c_write(chip, AD7152_CH1_OFFS_HIGH, data >> 8);
ad7152_i2c_write(chip, AD7152_CH1_OFFS_LOW, data);
chip->ch1_offset = data;
return len;
}
return -EINVAL;
}
static IIO_DEV_ATTR_CH1_OFFSET(S_IRUGO | S_IWUSR,
ad7152_show_ch1_offset,
ad7152_store_ch1_offset);
static ssize_t ad7152_show_ch2_offset(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "%d\n", chip->ch2_offset);
}
static ssize_t ad7152_store_ch2_offset(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = dev_info->dev_data;
unsigned long data;
int ret;
ret = strict_strtoul(buf, 10, &data);
if ((!ret) && (data < 0x10000)) {
ad7152_i2c_write(chip, AD7152_CH2_OFFS_HIGH, data >> 8);
ad7152_i2c_write(chip, AD7152_CH2_OFFS_LOW, data);
chip->ch2_offset = data;
return len;
}
return -EINVAL;
}
static IIO_DEV_ATTR_CH2_OFFSET(S_IRUGO | S_IWUSR,
ad7152_show_ch2_offset,
ad7152_store_ch2_offset);
static ssize_t ad7152_show_ch1_gain(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "%d\n", chip->ch1_gain);
}
static ssize_t ad7152_store_ch1_gain(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = dev_info->dev_data;
unsigned long data;
int ret;
ret = strict_strtoul(buf, 10, &data);
if ((!ret) && (data < 0x10000)) {
ad7152_i2c_write(chip, AD7152_CH1_GAIN_HIGH, data >> 8);
ad7152_i2c_write(chip, AD7152_CH1_GAIN_LOW, data);
chip->ch1_gain = data;
return len;
}
return -EINVAL;
}
static IIO_DEV_ATTR_CH1_GAIN(S_IRUGO | S_IWUSR,
ad7152_show_ch1_gain,
ad7152_store_ch1_gain);
static ssize_t ad7152_show_ch2_gain(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "%d\n", chip->ch2_gain);
}
static ssize_t ad7152_store_ch2_gain(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = dev_info->dev_data;
unsigned long data;
int ret;
ret = strict_strtoul(buf, 10, &data);
if ((!ret) && (data < 0x10000)) {
ad7152_i2c_write(chip, AD7152_CH2_GAIN_HIGH, data >> 8);
ad7152_i2c_write(chip, AD7152_CH2_GAIN_LOW, data);
chip->ch2_gain = data;
return len;
}
return -EINVAL;
}
static IIO_DEV_ATTR_CH2_GAIN(S_IRUGO | S_IWUSR,
ad7152_show_ch2_gain,
ad7152_store_ch2_gain);
static ssize_t ad7152_show_ch1_setup(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "0x%02x\n", chip->ch1_setup);
}
static ssize_t ad7152_store_ch1_setup(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = dev_info->dev_data;
unsigned long data;
int ret;
ret = strict_strtoul(buf, 10, &data);
if ((!ret) && (data < 0x100)) {
ad7152_i2c_write(chip, AD7152_CH1_SETUP, data);
chip->ch1_setup = data;
return len;
}
return -EINVAL;
}
static IIO_DEV_ATTR_CH1_SETUP(S_IRUGO | S_IWUSR,
ad7152_show_ch1_setup,
ad7152_store_ch1_setup);
static ssize_t ad7152_show_ch2_setup(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "0x%02x\n", chip->ch2_setup);
}
static ssize_t ad7152_store_ch2_setup(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = dev_info->dev_data;
unsigned long data;
int ret;
ret = strict_strtoul(buf, 10, &data);
if ((!ret) && (data < 0x100)) {
ad7152_i2c_write(chip, AD7152_CH2_SETUP, data);
chip->ch2_setup = data;
return len;
}
return -EINVAL;
}
static IIO_DEV_ATTR_CH2_SETUP(S_IRUGO | S_IWUSR,
ad7152_show_ch2_setup,
ad7152_store_ch2_setup);
static ssize_t ad7152_show_filter_rate_setup(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "0x%02x\n", chip->filter_rate_setup);
}
static ssize_t ad7152_store_filter_rate_setup(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = dev_info->dev_data;
unsigned long data;
int ret;
ret = strict_strtoul(buf, 10, &data);
if ((!ret) && (data < 0x100)) {
ad7152_i2c_write(chip, AD7152_CFG2, data);
chip->filter_rate_setup = data;
return len;
}
return -EINVAL;
}
static IIO_DEV_ATTR_FILTER_RATE_SETUP(S_IRUGO | S_IWUSR,
ad7152_show_filter_rate_setup,
ad7152_store_filter_rate_setup);
static ssize_t ad7152_show_name(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7152_chip_info *chip = dev_info->dev_data;
return sprintf(buf, "%s\n", chip->name);
}
static IIO_DEVICE_ATTR(name, S_IRUGO, ad7152_show_name, NULL, 0);
static struct attribute *ad7152_attributes[] = {
&iio_dev_attr_available_conversion_modes.dev_attr.attr,
&iio_dev_attr_conversion_mode.dev_attr.attr,
&iio_dev_attr_ch1_gain.dev_attr.attr,
&iio_dev_attr_ch2_gain.dev_attr.attr,
&iio_dev_attr_ch1_offset.dev_attr.attr,
&iio_dev_attr_ch2_offset.dev_attr.attr,
&iio_dev_attr_ch1_value.dev_attr.attr,
&iio_dev_attr_ch2_value.dev_attr.attr,
&iio_dev_attr_ch1_setup.dev_attr.attr,
&iio_dev_attr_ch2_setup.dev_attr.attr,
&iio_dev_attr_filter_rate_setup.dev_attr.attr,
&iio_dev_attr_name.dev_attr.attr,
NULL,
};
static const struct attribute_group ad7152_attribute_group = {
.attrs = ad7152_attributes,
};
/*
* device probe and remove
*/
static int __devinit ad7152_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret = 0;
struct ad7152_chip_info *chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (chip == NULL) {
ret = -ENOMEM;
goto error_ret;
}
/* this is only used for device removal purposes */
i2c_set_clientdata(client, chip);
chip->client = client;
chip->name = id->name;
chip->indio_dev = iio_allocate_device();
if (chip->indio_dev == NULL) {
ret = -ENOMEM;
goto error_free_chip;
}
/* Echipabilish that the iio_dev is a child of the i2c device */
chip->indio_dev->dev.parent = &client->dev;
chip->indio_dev->attrs = &ad7152_attribute_group;
chip->indio_dev->dev_data = (void *)(chip);
chip->indio_dev->driver_module = THIS_MODULE;
chip->indio_dev->modes = INDIO_DIRECT_MODE;
ret = iio_device_register(chip->indio_dev);
if (ret)
goto error_free_dev;
dev_err(&client->dev, "%s capacitive sensor registered\n", id->name);
return 0;
error_free_dev:
iio_free_device(chip->indio_dev);
error_free_chip:
kfree(chip);
error_ret:
return ret;
}
static int __devexit ad7152_remove(struct i2c_client *client)
{
struct ad7152_chip_info *chip = i2c_get_clientdata(client);
struct iio_dev *indio_dev = chip->indio_dev;
if (client->irq && gpio_is_valid(irq_to_gpio(client->irq)) > 0)
iio_unregister_interrupt_line(indio_dev, 0);
iio_device_unregister(indio_dev);
kfree(chip);
return 0;
}
static const struct i2c_device_id ad7152_id[] = {
{ "ad7152", 0 },
{ "ad7153", 0 },
{}
};
MODULE_DEVICE_TABLE(i2c, ad7152_id);
static struct i2c_driver ad7152_driver = {
.driver = {
.name = "ad7152",
},
.probe = ad7152_probe,
.remove = __devexit_p(ad7152_remove),
.id_table = ad7152_id,
};
static __init int ad7152_init(void)
{
return i2c_add_driver(&ad7152_driver);
}
static __exit void ad7152_exit(void)
{
i2c_del_driver(&ad7152_driver);
}
MODULE_AUTHOR("Barry Song <21cnbao@gmail.com>");
MODULE_DESCRIPTION("Analog Devices ad7152/3 capacitive sensor driver");
MODULE_LICENSE("GPL v2");
module_init(ad7152_init);
module_exit(ad7152_exit);