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staging: iio: adc: Enable driver support for ad799x AD converters 

Driver for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997 and
ad7998 multichannel ADC.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Acked-by: Jonathan Cameron <jic23@cam.ac.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Michael Hennerich 2010-10-01 16:41:51 +02:00 committed by Greg Kroah-Hartman
parent e5558679bb
commit 985dbe776b
5 changed files with 1345 additions and 0 deletions
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20
drivers/staging/iio/adc/Kconfig
View File

@ -26,3 +26,23 @@ config MAX1363_RING_BUFFER
help
Say yes here to include ring buffer support in the MAX1363
ADC driver.
config AD799X
tristate "Analog Devices AD799x ADC driver"
depends on I2C
select IIO_TRIGGER if IIO_RING_BUFFER
select AD799X_RING_BUFFER
help
Say yes here to build support for Analog Devices:
ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997, ad7998
i2c analog to digital convertors (ADC). Provides direct access
via sysfs.
config AD799X_RING_BUFFER
bool "Analog Devices AD799x: use ring buffer"
depends on AD799X
select IIO_RING_BUFFER
select IIO_SW_RING
help
Say yes here to include ring buffer support in the AD799X
ADC driver.

4
drivers/staging/iio/adc/Makefile
View File

@ -6,3 +6,7 @@ max1363-y := max1363_core.o
max1363-y += max1363_ring.o
obj-$(CONFIG_MAX1363) += max1363.o
ad799x-y := ad799x_core.o
ad799x-$(CONFIG_AD799X_RING_BUFFER) += ad799x_ring.o
obj-$(CONFIG_AD799X) += ad799x.o

157
drivers/staging/iio/adc/ad799x.h Normal file
View File

@ -0,0 +1,157 @@
/*
* Copyright (C) 2010 Michael Hennerich, Analog Devices Inc.
* Copyright (C) 2008-2010 Jonathan Cameron
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* ad799x.h
*/
#ifndef _AD799X_H_
#define _AD799X_H_
#define AD799X_CHANNEL_SHIFT 4
/*
* AD7991, AD7995 and AD7999 defines
*/
#define AD7991_REF_SEL 0x08
#define AD7991_FLTR 0x04
#define AD7991_BIT_TRIAL_DELAY 0x02
#define AD7991_SAMPLE_DELAY 0x01
/*
* AD7992, AD7993, AD7994, AD7997 and AD7998 defines
*/
#define AD7998_FLTR 0x08
#define AD7998_ALERT_EN 0x04
#define AD7998_BUSY_ALERT 0x02
#define AD7998_BUSY_ALERT_POL 0x01
#define AD7998_CONV_RES_REG 0x0
#define AD7998_ALERT_STAT_REG 0x1
#define AD7998_CONF_REG 0x2
#define AD7998_CYCLE_TMR_REG 0x3
#define AD7998_DATALOW_CH1_REG 0x4
#define AD7998_DATAHIGH_CH1_REG 0x5
#define AD7998_HYST_CH1_REG 0x6
#define AD7998_DATALOW_CH2_REG 0x7
#define AD7998_DATAHIGH_CH2_REG 0x8
#define AD7998_HYST_CH2_REG 0x9
#define AD7998_DATALOW_CH3_REG 0xA
#define AD7998_DATAHIGH_CH3_REG 0xB
#define AD7998_HYST_CH3_REG 0xC
#define AD7998_DATALOW_CH4_REG 0xD
#define AD7998_DATAHIGH_CH4_REG 0xE
#define AD7998_HYST_CH4_REG 0xF
#define AD7998_CYC_MASK 0x7
#define AD7998_CYC_DIS 0x0
#define AD7998_CYC_TCONF_32 0x1
#define AD7998_CYC_TCONF_64 0x2
#define AD7998_CYC_TCONF_128 0x3
#define AD7998_CYC_TCONF_256 0x4
#define AD7998_CYC_TCONF_512 0x5
#define AD7998_CYC_TCONF_1024 0x6
#define AD7998_CYC_TCONF_2048 0x7
#define AD7998_ALERT_STAT_CLEAR 0xFF
/*
* AD7997 and AD7997 defines
*/
#define AD7997_8_READ_SINGLE 0x80
#define AD7997_8_READ_SEQUENCE 0x70
enum {
ad7991,
ad7995,
ad7999,
ad7992,
ad7993,
ad7994,
ad7997,
ad7998
};
struct ad799x_state;
/**
* struct ad799x_chip_info - chip specifc information
* @num_inputs: number of physical inputs on chip
* @bits: accuracy of the adc in bits
* @int_vref_mv: the internal reference voltage
* @monitor_mode: whether the chip supports monitor interrupts
* @default_config: device default configuration
* @dev_attrs: pointer to the device attribute group
* @scan_attrs: pointer to the scan element attribute group
* @event_attrs: pointer to the monitor event attribute group
* @ad799x_set_scan_mode: function pointer to the device specific mode function
*/
struct ad799x_chip_info {
u8 num_inputs;
u8 bits;
u16 int_vref_mv;
bool monitor_mode;
u16 default_config;
struct attribute_group *dev_attrs;
struct attribute_group *scan_attrs;
struct attribute_group *event_attrs;
int (*ad799x_set_scan_mode) (struct ad799x_state *st,
unsigned mask);
};
struct ad799x_state {
struct iio_dev *indio_dev;
struct i2c_client *client;
const struct ad799x_chip_info *chip_info;
struct work_struct poll_work;
struct work_struct work_thresh;
atomic_t protect_ring;
struct iio_trigger *trig;
struct regulator *reg;
s64 last_timestamp;
u16 int_vref_mv;
unsigned id;
char *name;
u16 config;
};
/*
* TODO: struct ad799x_platform_data needs to go into inlude/linux/iio
*/
struct ad799x_platform_data {
u16 vref_mv;
};
int ad799x_set_scan_mode(struct ad799x_state *st, unsigned mask);
#ifdef CONFIG_AD799X_RING_BUFFER
int ad799x_single_channel_from_ring(struct ad799x_state *st, long mask);
int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev);
void ad799x_ring_cleanup(struct iio_dev *indio_dev);
#else /* CONFIG_AD799X_RING_BUFFER */
int ad799x_single_channel_from_ring(struct ad799x_state *st, long mask)
{
return -EINVAL;
}
static inline int
ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev)
{
return 0;
}
static inline void ad799x_ring_cleanup(struct iio_dev *indio_dev)
{
}
#endif /* CONFIG_AD799X_RING_BUFFER */
#endif /* _AD799X_H_ */

918
drivers/staging/iio/adc/ad799x_core.c Normal file
View File

@ -0,0 +1,918 @@
/*
* iio/adc/ad799x.c
* Copyright (C) 2010 Michael Hennerich, Analog Devices Inc.
*
* based on iio/adc/max1363
* Copyright (C) 2008-2010 Jonathan Cameron
*
* based on linux/drivers/i2c/chips/max123x
* Copyright (C) 2002-2004 Stefan Eletzhofer
*
* based on linux/drivers/acron/char/pcf8583.c
* Copyright (C) 2000 Russell King
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* ad799x.c
*
* Support for ad7991, ad7995, ad7999, ad7992, ad7993, ad7994, ad7997,
* ad7998 and similar chips.
*
*/
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/sysfs.h>
#include <linux/list.h>
#include <linux/i2c.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/err.h>
#include "../iio.h"
#include "../sysfs.h"
#include "../ring_generic.h"
#include "adc.h"
#include "ad799x.h"
/*
* ad799x register access by I2C
*/
static int ad799x_i2c_read16(struct ad799x_state *st, u8 reg, u16 *data)
{
struct i2c_client *client = st->client;
int ret = 0;
ret = i2c_smbus_read_word_data(client, reg);
if (ret < 0) {
dev_err(&client->dev, "I2C read error\n");
return ret;
}
*data = swab16((u16)ret);
return 0;
}
static int ad799x_i2c_read8(struct ad799x_state *st, u8 reg, u8 *data)
{
struct i2c_client *client = st->client;
int ret = 0;
ret = i2c_smbus_read_word_data(client, reg);
if (ret < 0) {
dev_err(&client->dev, "I2C read error\n");
return ret;
}
*data = ret;
return 0;
}
static int ad799x_i2c_write16(struct ad799x_state *st, u8 reg, u16 data)
{
struct i2c_client *client = st->client;
int ret = 0;
ret = i2c_smbus_write_word_data(client, reg, swab16(data));
if (ret < 0)
dev_err(&client->dev, "I2C write error\n");
return ret;
}
static int ad799x_i2c_write8(struct ad799x_state *st, u8 reg, u8 data)
{
struct i2c_client *client = st->client;
int ret = 0;
ret = i2c_smbus_write_byte_data(client, reg, data);
if (ret < 0)
dev_err(&client->dev, "I2C write error\n");
return ret;
}
static int ad799x_scan_el_set_state(struct iio_scan_el *scan_el,
struct iio_dev *indio_dev,
bool state)
{
struct ad799x_state *st = indio_dev->dev_data;
return ad799x_set_scan_mode(st, st->indio_dev->ring->scan_mask);
}
/* Here we claim all are 16 bits. This currently does no harm and saves
* us a lot of scan element listings */
#define AD799X_SCAN_EL(number) \
IIO_SCAN_EL_C(in##number, number, 0, ad799x_scan_el_set_state);
static AD799X_SCAN_EL(0);
static AD799X_SCAN_EL(1);
static AD799X_SCAN_EL(2);
static AD799X_SCAN_EL(3);
static AD799X_SCAN_EL(4);
static AD799X_SCAN_EL(5);
static AD799X_SCAN_EL(6);
static AD799X_SCAN_EL(7);
static ssize_t ad799x_show_precision(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad799x_state *st = iio_dev_get_devdata(dev_info);
return sprintf(buf, "%d\n", st->chip_info->bits);
}
static IIO_DEVICE_ATTR(in_precision, S_IRUGO, ad799x_show_precision,
NULL, 0);
static int ad7991_5_9_set_scan_mode(struct ad799x_state *st, unsigned mask)
{
return i2c_smbus_write_byte(st->client,
st->config | (mask << AD799X_CHANNEL_SHIFT));
}
static int ad7992_3_4_set_scan_mode(struct ad799x_state *st, unsigned mask)
{
return ad799x_i2c_write8(st, AD7998_CONF_REG,
st->config | (mask << AD799X_CHANNEL_SHIFT));
}
static int ad7997_8_set_scan_mode(struct ad799x_state *st, unsigned mask)
{
return ad799x_i2c_write16(st, AD7998_CONF_REG,
st->config | (mask << AD799X_CHANNEL_SHIFT));
}
int ad799x_set_scan_mode(struct ad799x_state *st, unsigned mask)
{
int ret;
if (st->chip_info->ad799x_set_scan_mode != NULL) {
ret = st->chip_info->ad799x_set_scan_mode(st, mask);
return (ret > 0) ? 0 : ret;
}
return 0;
}
static ssize_t ad799x_read_single_channel(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad799x_state *st = iio_dev_get_devdata(dev_info);
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
int ret = 0, len = 0;
u32 data ;
u16 rxbuf[1];
u8 cmd;
long mask;
mutex_lock(&dev_info->mlock);
mask = 1 << this_attr->address;
/* If ring buffer capture is occuring, query the buffer */
if (iio_ring_enabled(dev_info)) {
data = ad799x_single_channel_from_ring(st, mask);
if (data < 0) {
ret = data;
goto error_ret;
}
} else {
switch (st->id) {
case ad7991:
case ad7995:
case ad7999:
cmd = st->config | (mask << AD799X_CHANNEL_SHIFT);
break;
case ad7992:
case ad7993:
case ad7994:
cmd = mask << AD799X_CHANNEL_SHIFT;
break;
case ad7997:
case ad7998:
cmd = (this_attr->address <<
AD799X_CHANNEL_SHIFT) | AD7997_8_READ_SINGLE;
break;
default:
cmd = 0;
}
ret = ad799x_i2c_read16(st, cmd, rxbuf);
if (ret < 0)
goto error_ret;
data = rxbuf[0] & 0xFFF;
}
/* Pretty print the result */
len = sprintf(buf, "%u\n", data);
error_ret:
mutex_unlock(&dev_info->mlock);
return ret ? ret : len;
}
static ssize_t ad799x_read_frequency(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad799x_state *st = iio_dev_get_devdata(dev_info);
int ret, len = 0;
u8 val;
ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &val);
if (ret)
return ret;
val &= AD7998_CYC_MASK;
switch (val) {
case AD7998_CYC_DIS:
len = sprintf(buf, "0\n");
break;
case AD7998_CYC_TCONF_32:
len = sprintf(buf, "15625\n");
break;
case AD7998_CYC_TCONF_64:
len = sprintf(buf, "7812\n");
break;
case AD7998_CYC_TCONF_128:
len = sprintf(buf, "3906\n");
break;
case AD7998_CYC_TCONF_256:
len = sprintf(buf, "1953\n");
break;
case AD7998_CYC_TCONF_512:
len = sprintf(buf, "976\n");
break;
case AD7998_CYC_TCONF_1024:
len = sprintf(buf, "488\n");
break;
case AD7998_CYC_TCONF_2048:
len = sprintf(buf, "244\n");
break;
}
return len;
}
static ssize_t ad799x_write_frequency(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad799x_state *st = iio_dev_get_devdata(dev_info);
long val;
int ret;
u8 t;
ret = strict_strtol(buf, 10, &val);
if (ret)
return ret;
mutex_lock(&dev_info->mlock);
ret = ad799x_i2c_read8(st, AD7998_CYCLE_TMR_REG, &t);
if (ret)
goto error_ret_mutex;
/* Wipe the bits clean */
t &= ~AD7998_CYC_MASK;
switch (val) {
case 15625:
t |= AD7998_CYC_TCONF_32;
break;
case 7812:
t |= AD7998_CYC_TCONF_64;
break;
case 3906:
t |= AD7998_CYC_TCONF_128;
break;
case 1953:
t |= AD7998_CYC_TCONF_256;
break;
case 976:
t |= AD7998_CYC_TCONF_512;
break;
case 488:
t |= AD7998_CYC_TCONF_1024;
break;
case 244:
t |= AD7998_CYC_TCONF_2048;
break;
case 0:
t |= AD7998_CYC_DIS;
break;
default:
ret = -EINVAL;
goto error_ret_mutex;
}
ret = ad799x_i2c_write8(st, AD7998_CYCLE_TMR_REG, t);
error_ret_mutex:
mutex_unlock(&dev_info->mlock);
return ret ? ret : len;
}
static ssize_t ad799x_read_channel_config(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad799x_state *st = iio_dev_get_devdata(dev_info);
struct iio_event_attr *this_attr = to_iio_event_attr(attr);
int ret;
u16 val;
ret = ad799x_i2c_read16(st, this_attr->mask, &val);
if (ret)
return ret;
return sprintf(buf, "%d\n", val);
}
static ssize_t ad799x_write_channel_config(struct device *dev,
struct device_attribute *attr,
const char *buf,
size_t len)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad799x_state *st = iio_dev_get_devdata(dev_info);
struct iio_event_attr *this_attr = to_iio_event_attr(attr);
long val;
int ret;
ret = strict_strtol(buf, 10, &val);
if (ret)
return ret;
mutex_lock(&dev_info->mlock);
ret = ad799x_i2c_write16(st, this_attr->mask, val);
mutex_unlock(&dev_info->mlock);
return ret ? ret : len;
}
static void ad799x_interrupt_bh(struct work_struct *work_s)
{
struct ad799x_state *st = container_of(work_s,
struct ad799x_state, work_thresh);
u8 status;
int i;
if (ad799x_i2c_read8(st, AD7998_ALERT_STAT_REG, &status))
goto err_out;
if (!status)
goto err_out;
ad799x_i2c_write8(st, AD7998_ALERT_STAT_REG, AD7998_ALERT_STAT_CLEAR);
for (i = 0; i < 8; i++) {
if (status & (1 << i))
iio_push_event(st->indio_dev, 0,
i & 0x1 ?
IIO_EVENT_CODE_IN_HIGH_THRESH(i >> 1) :
IIO_EVENT_CODE_IN_LOW_THRESH(i >> 1),
st->last_timestamp);
}
err_out:
enable_irq(st->client->irq);
}
static int ad799x_interrupt(struct iio_dev *dev_info,
int index,
s64 timestamp,
int no_test)
{
struct ad799x_state *st = dev_info->dev_data;
st->last_timestamp = timestamp;
schedule_work(&st->work_thresh);
return 0;
}
IIO_EVENT_SH(ad799x, &ad799x_interrupt);
/* Direct read attribtues */
static IIO_DEV_ATTR_IN_RAW(0, ad799x_read_single_channel, 0);
static IIO_DEV_ATTR_IN_RAW(1, ad799x_read_single_channel, 1);
static IIO_DEV_ATTR_IN_RAW(2, ad799x_read_single_channel, 2);
static IIO_DEV_ATTR_IN_RAW(3, ad799x_read_single_channel, 3);
static IIO_DEV_ATTR_IN_RAW(4, ad799x_read_single_channel, 4);
static IIO_DEV_ATTR_IN_RAW(5, ad799x_read_single_channel, 5);
static IIO_DEV_ATTR_IN_RAW(6, ad799x_read_single_channel, 6);
static IIO_DEV_ATTR_IN_RAW(7, ad799x_read_single_channel, 7);
static ssize_t ad799x_show_scale(struct device *dev,
struct device_attribute *attr,
char *buf)
{
/* Driver currently only support internal vref */
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad799x_state *st = iio_dev_get_devdata(dev_info);
/* Corresponds to Vref / 2^(bits) */
if ((1 << (st->chip_info->bits + 1))
> st->int_vref_mv)
return sprintf(buf, "0.5\n");
else
return sprintf(buf, "%d\n",
st->int_vref_mv >> st->chip_info->bits);
}
static IIO_DEVICE_ATTR(in_scale, S_IRUGO, ad799x_show_scale, NULL, 0);
static ssize_t ad799x_show_name(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad799x_state *st = iio_dev_get_devdata(dev_info);
return sprintf(buf, "%s\n", st->client->name);
}
static IIO_DEVICE_ATTR(name, S_IRUGO, ad799x_show_name, NULL, 0);
static struct attribute *ad7991_5_9_3_4_device_attrs[] = {
&iio_dev_attr_in0_raw.dev_attr.attr,
&iio_dev_attr_in1_raw.dev_attr.attr,
&iio_dev_attr_in2_raw.dev_attr.attr,
&iio_dev_attr_in3_raw.dev_attr.attr,
&iio_dev_attr_name.dev_attr.attr,
&iio_dev_attr_in_scale.dev_attr.attr,
NULL
};
static struct attribute_group ad7991_5_9_3_4_dev_attr_group = {
.attrs = ad7991_5_9_3_4_device_attrs,
};
static struct attribute *ad7991_5_9_3_4_scan_el_attrs[] = {
&iio_scan_el_in0.dev_attr.attr,
&iio_const_attr_in0_index.dev_attr.attr,
&iio_scan_el_in1.dev_attr.attr,
&iio_const_attr_in1_index.dev_attr.attr,
&iio_scan_el_in2.dev_attr.attr,
&iio_const_attr_in2_index.dev_attr.attr,
&iio_scan_el_in3.dev_attr.attr,
&iio_const_attr_in3_index.dev_attr.attr,
&iio_dev_attr_in_precision.dev_attr.attr,
NULL,
};
static struct attribute_group ad7991_5_9_3_4_scan_el_group = {
.name = "scan_elements",
.attrs = ad7991_5_9_3_4_scan_el_attrs,
};
static struct attribute *ad7992_device_attrs[] = {
&iio_dev_attr_in0_raw.dev_attr.attr,
&iio_dev_attr_in1_raw.dev_attr.attr,
&iio_dev_attr_name.dev_attr.attr,
&iio_dev_attr_in_scale.dev_attr.attr,
NULL
};
static struct attribute_group ad7992_dev_attr_group = {
.attrs = ad7992_device_attrs,
};
static struct attribute *ad7992_scan_el_attrs[] = {
&iio_scan_el_in0.dev_attr.attr,
&iio_const_attr_in0_index.dev_attr.attr,
&iio_scan_el_in1.dev_attr.attr,
&iio_const_attr_in1_index.dev_attr.attr,
&iio_dev_attr_in_precision.dev_attr.attr,
NULL,
};
static struct attribute_group ad7992_scan_el_group = {
.name = "scan_elements",
.attrs = ad7992_scan_el_attrs,
};
static struct attribute *ad7997_8_device_attrs[] = {
&iio_dev_attr_in0_raw.dev_attr.attr,
&iio_dev_attr_in1_raw.dev_attr.attr,
&iio_dev_attr_in2_raw.dev_attr.attr,
&iio_dev_attr_in3_raw.dev_attr.attr,
&iio_dev_attr_in4_raw.dev_attr.attr,
&iio_dev_attr_in5_raw.dev_attr.attr,
&iio_dev_attr_in6_raw.dev_attr.attr,
&iio_dev_attr_in7_raw.dev_attr.attr,
&iio_dev_attr_name.dev_attr.attr,
&iio_dev_attr_in_scale.dev_attr.attr,
NULL
};
static struct attribute_group ad7997_8_dev_attr_group = {
.attrs = ad7997_8_device_attrs,
};
static struct attribute *ad7997_8_scan_el_attrs[] = {
&iio_scan_el_in0.dev_attr.attr,
&iio_const_attr_in0_index.dev_attr.attr,
&iio_scan_el_in1.dev_attr.attr,
&iio_const_attr_in1_index.dev_attr.attr,
&iio_scan_el_in2.dev_attr.attr,
&iio_const_attr_in2_index.dev_attr.attr,
&iio_scan_el_in3.dev_attr.attr,
&iio_const_attr_in3_index.dev_attr.attr,
&iio_scan_el_in4.dev_attr.attr,
&iio_const_attr_in4_index.dev_attr.attr,
&iio_scan_el_in5.dev_attr.attr,
&iio_const_attr_in5_index.dev_attr.attr,
&iio_scan_el_in6.dev_attr.attr,
&iio_const_attr_in6_index.dev_attr.attr,
&iio_scan_el_in7.dev_attr.attr,
&iio_const_attr_in7_index.dev_attr.attr,
&iio_dev_attr_in_precision.dev_attr.attr,
NULL,
};
static struct attribute_group ad7997_8_scan_el_group = {
.name = "scan_elements",
.attrs = ad7997_8_scan_el_attrs,
};
IIO_EVENT_ATTR_SH(in0_thresh_low_value,
iio_event_ad799x,
ad799x_read_channel_config,
ad799x_write_channel_config,
AD7998_DATALOW_CH1_REG);
IIO_EVENT_ATTR_SH(in0_thresh_high_value,
iio_event_ad799x,
ad799x_read_channel_config,
ad799x_write_channel_config,
AD7998_DATAHIGH_CH1_REG);
IIO_EVENT_ATTR_SH(in0_thresh_both_hyst_raw,
iio_event_ad799x,
ad799x_read_channel_config,
ad799x_write_channel_config,
AD7998_HYST_CH1_REG);
IIO_EVENT_ATTR_SH(in1_thresh_low_value,
iio_event_ad799x,
ad799x_read_channel_config,
ad799x_write_channel_config,
AD7998_DATALOW_CH2_REG);
IIO_EVENT_ATTR_SH(in1_thresh_high_value,
iio_event_ad799x,
ad799x_read_channel_config,
ad799x_write_channel_config,
AD7998_DATAHIGH_CH2_REG);
IIO_EVENT_ATTR_SH(in1_thresh_both_hyst_raw,
iio_event_ad799x,
ad799x_read_channel_config,
ad799x_write_channel_config,
AD7998_HYST_CH2_REG);
IIO_EVENT_ATTR_SH(in2_thresh_low_value,
iio_event_ad799x,
ad799x_read_channel_config,
ad799x_write_channel_config,
AD7998_DATALOW_CH3_REG);
IIO_EVENT_ATTR_SH(in2_thresh_high_value,
iio_event_ad799x,
ad799x_read_channel_config,
ad799x_write_channel_config,
AD7998_DATAHIGH_CH3_REG);
IIO_EVENT_ATTR_SH(in2_thresh_both_hyst_raw,
iio_event_ad799x,
ad799x_read_channel_config,
ad799x_write_channel_config,
AD7998_HYST_CH3_REG);
IIO_EVENT_ATTR_SH(in3_thresh_low_value,
iio_event_ad799x,
ad799x_read_channel_config,
ad799x_write_channel_config,
AD7998_DATALOW_CH4_REG);
IIO_EVENT_ATTR_SH(in3_thresh_high_value,
iio_event_ad799x,
ad799x_read_channel_config,
ad799x_write_channel_config,
AD7998_DATAHIGH_CH4_REG);
IIO_EVENT_ATTR_SH(in3_thresh_both_hyst_raw,
iio_event_ad799x,
ad799x_read_channel_config,
ad799x_write_channel_config,
AD7998_HYST_CH4_REG);
static IIO_DEV_ATTR_SAMP_FREQ(S_IWUSR | S_IRUGO,
ad799x_read_frequency,
ad799x_write_frequency);
static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("15625 7812 3906 1953 976 488 244 0");
static struct attribute *ad7993_4_7_8_event_attributes[] = {
&iio_event_attr_in0_thresh_low_value.dev_attr.attr,
&iio_event_attr_in0_thresh_high_value.dev_attr.attr,
&iio_event_attr_in0_thresh_both_hyst_raw.dev_attr.attr,
&iio_event_attr_in1_thresh_low_value.dev_attr.attr,
&iio_event_attr_in1_thresh_high_value.dev_attr.attr,
&iio_event_attr_in1_thresh_both_hyst_raw.dev_attr.attr,
&iio_event_attr_in2_thresh_low_value.dev_attr.attr,
&iio_event_attr_in2_thresh_high_value.dev_attr.attr,
&iio_event_attr_in2_thresh_both_hyst_raw.dev_attr.attr,
&iio_event_attr_in3_thresh_low_value.dev_attr.attr,
&iio_event_attr_in3_thresh_high_value.dev_attr.attr,
&iio_event_attr_in3_thresh_both_hyst_raw.dev_attr.attr,
&iio_dev_attr_sampling_frequency.dev_attr.attr,
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
NULL,
};
static struct attribute_group ad7993_4_7_8_event_attrs_group = {
.attrs = ad7993_4_7_8_event_attributes,
};
static struct attribute *ad7992_event_attributes[] = {
&iio_event_attr_in0_thresh_low_value.dev_attr.attr,
&iio_event_attr_in0_thresh_high_value.dev_attr.attr,
&iio_event_attr_in0_thresh_both_hyst_raw.dev_attr.attr,
&iio_event_attr_in1_thresh_low_value.dev_attr.attr,
&iio_event_attr_in1_thresh_high_value.dev_attr.attr,
&iio_event_attr_in1_thresh_both_hyst_raw.dev_attr.attr,
&iio_dev_attr_sampling_frequency.dev_attr.attr,
&iio_const_attr_sampling_frequency_available.dev_attr.attr,
NULL,
};
static struct attribute_group ad7992_event_attrs_group = {
.attrs = ad7992_event_attributes,
};
static const struct ad799x_chip_info ad799x_chip_info_tbl[] = {
[ad7991] = {
.num_inputs = 4,
.bits = 12,
.int_vref_mv = 4096,
.dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
.scan_attrs = &ad7991_5_9_3_4_scan_el_group,
.ad799x_set_scan_mode = ad7991_5_9_set_scan_mode,
},
[ad7995] = {
.num_inputs = 4,
.bits = 10,
.int_vref_mv = 1024,
.dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
.scan_attrs = &ad7991_5_9_3_4_scan_el_group,
.ad799x_set_scan_mode = ad7991_5_9_set_scan_mode,
},
[ad7999] = {
.num_inputs = 4,
.bits = 10,
.int_vref_mv = 1024,
.dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
.scan_attrs = &ad7991_5_9_3_4_scan_el_group,
.ad799x_set_scan_mode = ad7991_5_9_set_scan_mode,
},
[ad7992] = {
.num_inputs = 2,
.bits = 12,
.int_vref_mv = 4096,
.monitor_mode = true,
.default_config = AD7998_ALERT_EN,
.dev_attrs = &ad7992_dev_attr_group,
.scan_attrs = &ad7992_scan_el_group,
.event_attrs = &ad7992_event_attrs_group,
.ad799x_set_scan_mode = ad7992_3_4_set_scan_mode,
},
[ad7993] = {
.num_inputs = 4,
.bits = 10,
.int_vref_mv = 1024,
.monitor_mode = true,
.default_config = AD7998_ALERT_EN,
.dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
.scan_attrs = &ad7991_5_9_3_4_scan_el_group,
.event_attrs = &ad7993_4_7_8_event_attrs_group,
.ad799x_set_scan_mode = ad7992_3_4_set_scan_mode,
},
[ad7994] = {
.num_inputs = 4,
.bits = 12,
.int_vref_mv = 4096,
.monitor_mode = true,
.default_config = AD7998_ALERT_EN,
.dev_attrs = &ad7991_5_9_3_4_dev_attr_group,
.scan_attrs = &ad7991_5_9_3_4_scan_el_group,
.event_attrs = &ad7993_4_7_8_event_attrs_group,
.ad799x_set_scan_mode = ad7992_3_4_set_scan_mode,
},
[ad7997] = {
.num_inputs = 8,
.bits = 10,
.int_vref_mv = 1024,
.monitor_mode = true,
.default_config = AD7998_ALERT_EN,
.dev_attrs = &ad7997_8_dev_attr_group,
.scan_attrs = &ad7997_8_scan_el_group,
.event_attrs = &ad7993_4_7_8_event_attrs_group,
.ad799x_set_scan_mode = ad7997_8_set_scan_mode,
},
[ad7998] = {
.num_inputs = 8,
.bits = 12,
.int_vref_mv = 4096,
.monitor_mode = true,
.default_config = AD7998_ALERT_EN,
.dev_attrs = &ad7997_8_dev_attr_group,
.scan_attrs = &ad7997_8_scan_el_group,
.event_attrs = &ad7993_4_7_8_event_attrs_group,
.ad799x_set_scan_mode = ad7997_8_set_scan_mode,
},
};
static int __devinit ad799x_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
int ret, regdone = 0;
struct ad799x_platform_data *pdata = client->dev.platform_data;
struct ad799x_state *st = kzalloc(sizeof(*st), GFP_KERNEL);
if (st == NULL) {
ret = -ENOMEM;
goto error_ret;
}
/* this is only used for device removal purposes */
i2c_set_clientdata(client, st);
atomic_set(&st->protect_ring, 0);
st->id = id->driver_data;
st->chip_info = &ad799x_chip_info_tbl[st->id];
st->config = st->chip_info->default_config;
/* TODO: Add pdata options for filtering and bit delay */
if (pdata)
st->int_vref_mv = pdata->vref_mv;
else
st->int_vref_mv = st->chip_info->int_vref_mv;
st->reg = regulator_get(&client->dev, "vcc");
if (!IS_ERR(st->reg)) {
ret = regulator_enable(st->reg);
if (ret)
goto error_put_reg;
}
st->client = client;
st->indio_dev = iio_allocate_device();
if (st->indio_dev == NULL) {
ret = -ENOMEM;
goto error_disable_reg;
}
/* Estabilish that the iio_dev is a child of the i2c device */
st->indio_dev->dev.parent = &client->dev;
st->indio_dev->attrs = st->chip_info->dev_attrs;
st->indio_dev->event_attrs = st->chip_info->event_attrs;
st->indio_dev->dev_data = (void *)(st);
st->indio_dev->driver_module = THIS_MODULE;
st->indio_dev->modes = INDIO_DIRECT_MODE;
st->indio_dev->num_interrupt_lines = 1;
ret = ad799x_set_scan_mode(st, 0);
if (ret)
goto error_free_device;
ret = ad799x_register_ring_funcs_and_init(st->indio_dev);
if (ret)
goto error_free_device;
ret = iio_device_register(st->indio_dev);
if (ret)
goto error_cleanup_ring;
regdone = 1;
ret = iio_ring_buffer_register(st->indio_dev->ring, 0);
if (ret)
goto error_cleanup_ring;
if (client->irq > 0 && st->chip_info->monitor_mode) {
INIT_WORK(&st->work_thresh, ad799x_interrupt_bh);
ret = iio_register_interrupt_line(client->irq,
st->indio_dev,
0,
IRQF_TRIGGER_FALLING,
client->name);
if (ret)
goto error_cleanup_ring;
/*
* The event handler list element refer to iio_event_ad799x.
* All event attributes bind to the same event handler.
* So, only register event handler once.
*/
iio_add_event_to_list(&iio_event_ad799x,
&st->indio_dev->interrupts[0]->ev_list);
}
return 0;
error_cleanup_ring:
ad799x_ring_cleanup(st->indio_dev);
error_free_device:
if (!regdone)
iio_free_device(st->indio_dev);
else
iio_device_unregister(st->indio_dev);
error_disable_reg:
if (!IS_ERR(st->reg))
regulator_disable(st->reg);
error_put_reg:
if (!IS_ERR(st->reg))
regulator_put(st->reg);
kfree(st);
error_ret:
return ret;
}
static __devexit int ad799x_remove(struct i2c_client *client)
{
struct ad799x_state *st = i2c_get_clientdata(client);
struct iio_dev *indio_dev = st->indio_dev;
if (client->irq > 0 && st->chip_info->monitor_mode)
iio_unregister_interrupt_line(indio_dev, 0);
iio_ring_buffer_unregister(indio_dev->ring);
ad799x_ring_cleanup(indio_dev);
iio_device_unregister(indio_dev);
if (!IS_ERR(st->reg)) {
regulator_disable(st->reg);
regulator_put(st->reg);
}
kfree(st);
return 0;
}
static const struct i2c_device_id ad799x_id[] = {
{ "ad7991", ad7991 },
{ "ad7995", ad7995 },
{ "ad7999", ad7999 },
{ "ad7992", ad7992 },
{ "ad7993", ad7993 },
{ "ad7994", ad7994 },
{ "ad7997", ad7997 },
{ "ad7998", ad7998 },
{}
};
MODULE_DEVICE_TABLE(i2c, ad799x_id);
static struct i2c_driver ad799x_driver = {
.driver = {
.name = "ad799x",
},
.probe = ad799x_probe,
.remove = __devexit_p(ad799x_remove),
.id_table = ad799x_id,
};
static __init int ad799x_init(void)
{
return i2c_add_driver(&ad799x_driver);
}
static __exit void ad799x_exit(void)
{
i2c_del_driver(&ad799x_driver);
}
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Analog Devices AD799x ADC");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("i2c:ad799x");
module_init(ad799x_init);
module_exit(ad799x_exit);

246
drivers/staging/iio/adc/ad799x_ring.c Normal file
View File

@ -0,0 +1,246 @@
/*
* Copyright (C) 2010 Michael Hennerich, Analog Devices Inc.
* Copyright (C) 2008-2010 Jonathan Cameron
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* ad799x_ring.c
*/
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/sysfs.h>
#include <linux/list.h>
#include <linux/i2c.h>
#include <linux/bitops.h>
#include "../iio.h"
#include "../ring_generic.h"
#include "../ring_sw.h"
#include "../trigger.h"
#include "../sysfs.h"
#include "ad799x.h"
int ad799x_single_channel_from_ring(struct ad799x_state *st, long mask)
{
unsigned long numvals;
int count = 0, ret;
u16 *ring_data;
if (!(st->indio_dev->ring->scan_mask & mask)) {
ret = -EBUSY;
goto error_ret;
}
numvals = st->indio_dev->ring->scan_count;
ring_data = kmalloc(numvals*2, GFP_KERNEL);
if (ring_data == NULL) {
ret = -ENOMEM;
goto error_ret;
}
ret = st->indio_dev->ring->access.read_last(st->indio_dev->ring,
(u8 *) ring_data);
if (ret)
goto error_free_ring_data;
/* Need a count of channels prior to this one */
mask >>= 1;
while (mask) {
if (mask & st->indio_dev->ring->scan_mask)
count++;
mask >>= 1;
}
ret = be16_to_cpu(ring_data[count]) & 0xFFF;
error_free_ring_data:
kfree(ring_data);
error_ret:
return ret;
}
/**
* ad799x_ring_preenable() setup the parameters of the ring before enabling
*
* The complex nature of the setting of the nuber of bytes per datum is due
* to this driver currently ensuring that the timestamp is stored at an 8
* byte boundary.
**/
static int ad799x_ring_preenable(struct iio_dev *indio_dev)
{
struct ad799x_state *st = indio_dev->dev_data;
size_t d_size;
unsigned long numvals;
/*
* Need to figure out the current mode based upon the requested
* scan mask in iio_dev
*/
if (st->id == ad7997 || st->id == ad7998)
ad799x_set_scan_mode(st, st->indio_dev->ring->scan_mask);
numvals = st->indio_dev->ring->scan_count;
if (indio_dev->ring->access.set_bytes_per_datum) {
d_size = numvals*2 + sizeof(s64);
if (d_size % 8)
d_size += 8 - (d_size % 8);
indio_dev->ring->access.set_bytes_per_datum(indio_dev->ring,
d_size);
}
return 0;
}
/**
* ad799x_poll_func_th() th of trigger launched polling to ring buffer
*
* As sampling only occurs on i2c comms occuring, leave timestamping until
* then. Some triggers will generate their own time stamp. Currently
* there is no way of notifying them when no one cares.
**/
static void ad799x_poll_func_th(struct iio_dev *indio_dev, s64 time)
{
struct ad799x_state *st = indio_dev->dev_data;
schedule_work(&st->poll_work);
return;
}
/**
* ad799x_poll_bh_to_ring() bh of trigger launched polling to ring buffer
* @work_s: the work struct through which this was scheduled
*
* Currently there is no option in this driver to disable the saving of
* timestamps within the ring.
* I think the one copy of this at a time was to avoid problems if the
* trigger was set far too high and the reads then locked up the computer.
**/
static void ad799x_poll_bh_to_ring(struct work_struct *work_s)
{
struct ad799x_state *st = container_of(work_s, struct ad799x_state,
poll_work);
struct iio_dev *indio_dev = st->indio_dev;
struct iio_sw_ring_buffer *ring = iio_to_sw_ring(indio_dev->ring);
s64 time_ns;
__u8 *rxbuf;
int b_sent;
size_t d_size;
u8 cmd;
unsigned long numvals = st->indio_dev->ring->scan_count;
/* Ensure the timestamp is 8 byte aligned */
d_size = numvals*2 + sizeof(s64);
if (d_size % sizeof(s64))
d_size += sizeof(s64) - (d_size % sizeof(s64));
/* Ensure only one copy of this function running at a time */
if (atomic_inc_return(&st->protect_ring) > 1)
return;
/* Monitor mode prevents reading. Whilst not currently implemented
* might as well have this test in here in the meantime as it does
* no harm.
*/
if (numvals == 0)
return;
rxbuf = kmalloc(d_size, GFP_KERNEL);
if (rxbuf == NULL)
return;
switch (st->id) {
case ad7991:
case ad7995:
case ad7999:
cmd = st->config | (st->indio_dev->ring->scan_mask <<
AD799X_CHANNEL_SHIFT);
break;
case ad7992:
case ad7993:
case ad7994:
cmd = (st->indio_dev->ring->scan_mask <<
AD799X_CHANNEL_SHIFT) | AD7998_CONV_RES_REG;
break;
case ad7997:
case ad7998:
cmd = AD7997_8_READ_SEQUENCE | AD7998_CONV_RES_REG;
break;
default:
cmd = 0;
}
b_sent = i2c_smbus_read_i2c_block_data(st->client,
cmd, numvals*2, rxbuf);
if (b_sent < 0)
goto done;
time_ns = iio_get_time_ns();
memcpy(rxbuf + d_size - sizeof(s64), &time_ns, sizeof(time_ns));
indio_dev->ring->access.store_to(&ring->buf, rxbuf, time_ns);
done:
kfree(rxbuf);
atomic_dec(&st->protect_ring);
}
int ad799x_register_ring_funcs_and_init(struct iio_dev *indio_dev)
{
struct ad799x_state *st = indio_dev->dev_data;
int ret = 0;
indio_dev->ring = iio_sw_rb_allocate(indio_dev);
if (!indio_dev->ring) {
ret = -ENOMEM;
goto error_ret;
}
/* Effectively select the ring buffer implementation */
iio_ring_sw_register_funcs(&st->indio_dev->ring->access);
indio_dev->pollfunc = kzalloc(sizeof(*indio_dev->pollfunc), GFP_KERNEL);
if (indio_dev->pollfunc == NULL) {
ret = -ENOMEM;
goto error_deallocate_sw_rb;
}
/* Configure the polling function called on trigger interrupts */
indio_dev->pollfunc->poll_func_main = &ad799x_poll_func_th;
indio_dev->pollfunc->private_data = indio_dev;
/* Ring buffer functions - here trigger setup related */
indio_dev->ring->preenable = &ad799x_ring_preenable;
indio_dev->ring->postenable = &iio_triggered_ring_postenable;
indio_dev->ring->predisable = &iio_triggered_ring_predisable;
INIT_WORK(&st->poll_work, &ad799x_poll_bh_to_ring);
indio_dev->ring->scan_el_attrs = st->chip_info->scan_attrs;
/* Flag that polled ring buffering is possible */
indio_dev->modes |= INDIO_RING_TRIGGERED;
return 0;
error_deallocate_sw_rb:
iio_sw_rb_free(indio_dev->ring);
error_ret:
return ret;
}
void ad799x_ring_cleanup(struct iio_dev *indio_dev)
{
/* ensure that the trigger has been detached */
if (indio_dev->trig) {
iio_put_trigger(indio_dev->trig);
iio_trigger_dettach_poll_func(indio_dev->trig,
indio_dev->pollfunc);
}
kfree(indio_dev->pollfunc);
iio_sw_rb_free(indio_dev->ring);
}