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staging: iio: adc: Enable driver support for ad7887 AD converter 

Enable support for AD7887:  SPI Micropower, 2-Channel, 125 kSPS, 12-Bit ADC

staging: iio: adc: Fix according to review feedback

Review feedback by Jonathan Cameron:
	Combine statements.
	Document struct members.
	Remove redundant variable initialization.
	Simplify multichannel scan from ring logic.
	Fix coding style.

[v2]
staging: iio: adc: ad7887: Fix typos

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 2010-11-22 14:35:32 +01:00 committed by Greg Kroah-Hartman
parent b5a4948175
commit 2b4756aa36
5 changed files with 694 additions and 0 deletions
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14
drivers/staging/iio/adc/Kconfig
View File

@ -97,6 +97,20 @@ config AD7476
To compile this driver as a module, choose M here: the
module will be called ad7476.
config AD7887
tristate "Analog Devices AD7887 ADC driver"
depends on SPI
select IIO_RING_BUFFER
select IIO_SW_RING
select IIO_TRIGGER
help
Say yes here to build support for Analog Devices
AD7887 SPI analog to digital convertor (ADC).
If unsure, say N (but it's safe to say "Y").
To compile this driver as a module, choose M here: the
module will be called ad7887.
config AD7745
tristate "Analog Devices AD7745, AD7746 AD7747 capacitive sensor driver"
depends on I2C

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

@ -15,6 +15,10 @@ ad7476-y := ad7476_core.o
ad7476-$(CONFIG_IIO_RING_BUFFER) += ad7476_ring.o
obj-$(CONFIG_AD7476) += ad7476.o
ad7887-y := ad7887_core.o
ad7887-$(CONFIG_IIO_RING_BUFFER) += ad7887_ring.o
obj-$(CONFIG_AD7887) += ad7887.o
obj-$(CONFIG_AD7150) += ad7150.o
obj-$(CONFIG_AD7152) += ad7152.o
obj-$(CONFIG_AD7291) += ad7291.o

105
drivers/staging/iio/adc/ad7887.h Normal file
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@ -0,0 +1,105 @@
/*
* AD7887 SPI ADC driver
*
* Copyright 2010 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#ifndef IIO_ADC_AD7887_H_
#define IIO_ADC_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) /* TODO: move this into a common header */
/*
* TODO: struct ad7887_platform_data needs to go into include/linux/iio
*/
struct ad7887_platform_data {
/* External Vref voltage applied */
u16 vref_mv;
/*
* AD7887:
* In single channel mode en_dual = flase, AIN1/Vref pins assumes its
* Vref function. In dual channel mode en_dual = true, AIN1 becomes the
* second input channel, and Vref is internally connected to Vdd.
*/
bool en_dual;
/*
* AD7887:
* use_onchip_ref = true, the Vref is internally connected to the 2.500V
* Voltage reference. If use_onchip_ref = false, the reference voltage
* is supplied by AIN1/Vref
*/
bool use_onchip_ref;
};
struct ad7887_chip_info {
u8 bits; /* number of ADC bits */
u8 storagebits; /* number of bits read from the ADC */
u8 left_shift; /* number of bits the sample must be shifted */
char sign; /* [s]igned or [u]nsigned */
u16 int_vref_mv; /* internal reference voltage */
};
struct ad7887_state {
struct iio_dev *indio_dev;
struct spi_device *spi;
const struct ad7887_chip_info *chip_info;
struct regulator *reg;
struct work_struct poll_work;
atomic_t protect_ring;
u16 int_vref_mv;
bool en_dual;
struct spi_transfer xfer[4];
struct spi_message msg[3];
struct spi_message *ring_msg;
unsigned char tx_cmd_buf[8];
/*
* DMA (thus cache coherency maintenance) requires the
* transfer buffers to live in their own cache lines.
*/
unsigned char data[4] ____cacheline_aligned;
};
enum ad7887_supported_device_ids {
ID_AD7887
};
#ifdef CONFIG_IIO_RING_BUFFER
int ad7887_scan_from_ring(struct ad7887_state *st, long mask);
int ad7887_register_ring_funcs_and_init(struct iio_dev *indio_dev);
void ad7887_ring_cleanup(struct iio_dev *indio_dev);
#else /* CONFIG_IIO_RING_BUFFER */
static inline int ad7887_scan_from_ring(struct ad7887_state *st, long mask)
{
return 0;
}
static inline int
ad7887_register_ring_funcs_and_init(struct iio_dev *indio_dev)
{
return 0;
}
static inline void ad7887_ring_cleanup(struct iio_dev *indio_dev)
{
}
#endif /* CONFIG_IIO_RING_BUFFER */
#endif /* IIO_ADC_AD7887_H_ */

305
drivers/staging/iio/adc/ad7887_core.c Normal file
View File

@ -0,0 +1,305 @@
/*
* AD7887 SPI ADC driver
*
* Copyright 2010 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <linux/interrupt.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/spi/spi.h>
#include <linux/regulator/consumer.h>
#include <linux/err.h>
#include "../iio.h"
#include "../sysfs.h"
#include "../ring_generic.h"
#include "adc.h"
#include "ad7887.h"
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 ssize_t ad7887_scan(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7887_state *st = dev_info->dev_data;
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
int ret;
mutex_lock(&dev_info->mlock);
if (iio_ring_enabled(dev_info))
ret = ad7887_scan_from_ring(st, 1 << this_attr->address);
else
ret = ad7887_scan_direct(st, this_attr->address);
mutex_unlock(&dev_info->mlock);
if (ret < 0)
return ret;
return sprintf(buf, "%d\n", (ret >> st->chip_info->left_shift) &
RES_MASK(st->chip_info->bits));
}
static IIO_DEV_ATTR_IN_RAW(0, ad7887_scan, 0);
static IIO_DEV_ATTR_IN_RAW(1, ad7887_scan, 1);
static ssize_t ad7887_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 ad7887_state *st = iio_dev_get_devdata(dev_info);
/* Corresponds to Vref / 2^(bits) */
unsigned int scale_uv = (st->int_vref_mv * 1000) >> st->chip_info->bits;
return sprintf(buf, "%d.%d\n", scale_uv / 1000, scale_uv % 1000);
}
static IIO_DEVICE_ATTR(in_scale, S_IRUGO, ad7887_show_scale, NULL, 0);
static ssize_t ad7887_show_name(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7887_state *st = iio_dev_get_devdata(dev_info);
return sprintf(buf, "%s\n", spi_get_device_id(st->spi)->name);
}
static IIO_DEVICE_ATTR(name, S_IRUGO, ad7887_show_name, NULL, 0);
static struct attribute *ad7887_attributes[] = {
&iio_dev_attr_in0_raw.dev_attr.attr,
&iio_dev_attr_in1_raw.dev_attr.attr,
&iio_dev_attr_in_scale.dev_attr.attr,
&iio_dev_attr_name.dev_attr.attr,
NULL,
};
static mode_t ad7887_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct iio_dev *dev_info = dev_get_drvdata(dev);
struct ad7887_state *st = iio_dev_get_devdata(dev_info);
mode_t mode = attr->mode;
if ((attr == &iio_dev_attr_in1_raw.dev_attr.attr) && !st->en_dual)
mode = 0;
return mode;
}
static const struct attribute_group ad7887_attribute_group = {
.attrs = ad7887_attributes,
.is_visible = ad7887_attr_is_visible,
};
static const struct ad7887_chip_info ad7887_chip_info_tbl[] = {
/*
* More devices added in future
*/
[ID_AD7887] = {
.bits = 12,
.storagebits = 16,
.left_shift = 0,
.sign = IIO_SCAN_EL_TYPE_UNSIGNED,
.int_vref_mv = 2500,
},
};
static int __devinit ad7887_probe(struct spi_device *spi)
{
struct ad7887_platform_data *pdata = spi->dev.platform_data;
struct ad7887_state *st;
int ret, voltage_uv = 0;
st = kzalloc(sizeof(*st), GFP_KERNEL);
if (st == NULL) {
ret = -ENOMEM;
goto error_ret;
}
st->reg = regulator_get(&spi->dev, "vcc");
if (!IS_ERR(st->reg)) {
ret = regulator_enable(st->reg);
if (ret)
goto error_put_reg;
voltage_uv = regulator_get_voltage(st->reg);
}
st->chip_info =
&ad7887_chip_info_tbl[spi_get_device_id(spi)->driver_data];
spi_set_drvdata(spi, st);
atomic_set(&st->protect_ring, 0);
st->spi = spi;
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 spi device */
st->indio_dev->dev.parent = &spi->dev;
st->indio_dev->attrs = &ad7887_attribute_group;
st->indio_dev->dev_data = (void *)(st);
st->indio_dev->driver_module = THIS_MODULE;
st->indio_dev->modes = INDIO_DIRECT_MODE;
/* Setup default message */
st->tx_cmd_buf[0] = AD7887_CH_AIN0 | AD7887_PM_MODE4 |
((pdata && pdata->use_onchip_ref) ?
0 : AD7887_REF_DIS);
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[0] |= AD7887_DUAL | AD7887_REF_DIS;
st->tx_cmd_buf[2] = AD7887_CH_AIN1 | AD7887_DUAL |
AD7887_REF_DIS | AD7887_PM_MODE4;
st->tx_cmd_buf[4] = AD7887_CH_AIN0 | AD7887_DUAL |
AD7887_REF_DIS | AD7887_PM_MODE4;
st->tx_cmd_buf[6] = AD7887_CH_AIN1 | AD7887_DUAL |
AD7887_REF_DIS | AD7887_PM_MODE4;
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[4];
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[0];
st->xfer[3].tx_buf = &st->tx_cmd_buf[6];
st->xfer[3].len = 2;
spi_message_init(&st->msg[AD7887_CH1]);
spi_message_add_tail(&st->xfer[3], &st->msg[AD7887_CH1]);
st->en_dual = true;
if (pdata && pdata->vref_mv)
st->int_vref_mv = pdata->vref_mv;
else if (voltage_uv)
st->int_vref_mv = voltage_uv / 1000;
else
dev_warn(&spi->dev, "reference voltage unspecified\n");
} else {
if (pdata && pdata->vref_mv)
st->int_vref_mv = pdata->vref_mv;
else if (pdata && pdata->use_onchip_ref)
st->int_vref_mv = st->chip_info->int_vref_mv;
else
dev_warn(&spi->dev, "reference voltage unspecified\n");
}
ret = ad7887_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_free_device;
ret = iio_ring_buffer_register(st->indio_dev->ring, 0);
if (ret)
goto error_cleanup_ring;
return 0;
error_cleanup_ring:
ad7887_ring_cleanup(st->indio_dev);
iio_device_unregister(st->indio_dev);
error_free_device:
iio_free_device(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 int ad7887_remove(struct spi_device *spi)
{
struct ad7887_state *st = spi_get_drvdata(spi);
struct iio_dev *indio_dev = st->indio_dev;
iio_ring_buffer_unregister(indio_dev->ring);
ad7887_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 spi_device_id ad7887_id[] = {
{"ad7887", ID_AD7887},
{}
};
static struct spi_driver ad7887_driver = {
.driver = {
.name = "ad7887",
.bus = &spi_bus_type,
.owner = THIS_MODULE,
},
.probe = ad7887_probe,
.remove = __devexit_p(ad7887_remove),
.id_table = ad7887_id,
};
static int __init ad7887_init(void)
{
return spi_register_driver(&ad7887_driver);
}
module_init(ad7887_init);
static void __exit ad7887_exit(void)
{
spi_unregister_driver(&ad7887_driver);
}
module_exit(ad7887_exit);
MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
MODULE_DESCRIPTION("Analog Devices AD7887 ADC");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("spi:ad7887");

266
drivers/staging/iio/adc/ad7887_ring.c Normal file
View File

@ -0,0 +1,266 @@
/*
* Copyright 2010 Analog Devices Inc.
* Copyright (C) 2008 Jonathan Cameron
*
* Licensed under the GPL-2 or later.
*
* ad7887_ring.c
*/
#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/spi/spi.h>
#include "../iio.h"
#include "../ring_generic.h"
#include "../ring_sw.h"
#include "../trigger.h"
#include "../sysfs.h"
#include "ad7887.h"
static IIO_SCAN_EL_C(in0, 0, 0, NULL);
static IIO_SCAN_EL_C(in1, 1, 0, NULL);
static ssize_t ad7887_show_type(struct device *dev,
struct device_attribute *attr,
char *buf)
{
struct iio_ring_buffer *ring = dev_get_drvdata(dev);
struct iio_dev *indio_dev = ring->indio_dev;
struct ad7887_state *st = indio_dev->dev_data;
return sprintf(buf, "%c%d/%d>>%d\n", st->chip_info->sign,
st->chip_info->bits, st->chip_info->storagebits,
st->chip_info->left_shift);
}
static IIO_DEVICE_ATTR(in_type, S_IRUGO, ad7887_show_type, NULL, 0);
static struct attribute *ad7887_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_type.dev_attr.attr,
NULL,
};
static mode_t ad7887_scan_el_attr_is_visible(struct kobject *kobj,
struct attribute *attr, int n)
{
struct device *dev = container_of(kobj, struct device, kobj);
struct iio_ring_buffer *ring = dev_get_drvdata(dev);
struct iio_dev *indio_dev = ring->indio_dev;
struct ad7887_state *st = indio_dev->dev_data;
mode_t mode = attr->mode;
if ((attr == &iio_scan_el_in1.dev_attr.attr) ||
(attr == &iio_const_attr_in1_index.dev_attr.attr))
if (!st->en_dual)
mode = 0;
return mode;
}
static struct attribute_group ad7887_scan_el_group = {
.name = "scan_elements",
.attrs = ad7887_scan_el_attrs,
.is_visible = ad7887_scan_el_attr_is_visible,
};
int ad7887_scan_from_ring(struct ad7887_state *st, long mask)
{
struct iio_ring_buffer *ring = st->indio_dev->ring;
int count = 0, ret;
u16 *ring_data;
if (!(ring->scan_mask & mask)) {
ret = -EBUSY;
goto error_ret;
}
ring_data = kmalloc(ring->access.get_bytes_per_datum(ring), GFP_KERNEL);
if (ring_data == NULL) {
ret = -ENOMEM;
goto error_ret;
}
ret = ring->access.read_last(ring, (u8 *) ring_data);
if (ret)
goto error_free_ring_data;
/* for single channel scan the result is stored with zero offset */
if ((ring->scan_mask == ((1 << 1) | (1 << 0))) && (mask == (1 << 1)))
count = 1;
ret = be16_to_cpu(ring_data[count]);
error_free_ring_data:
kfree(ring_data);
error_ret:
return ret;
}
/**
* ad7887_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 ad7887_ring_preenable(struct iio_dev *indio_dev)
{
struct ad7887_state *st = indio_dev->dev_data;
struct iio_ring_buffer *ring = indio_dev->ring;
size_t d_size;
if (indio_dev->ring->access.set_bytes_per_datum) {
d_size = st->chip_info->storagebits / 8 + 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);
}
switch (ring->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 = indio_dev->dev_data;
/* dummy read: restore default CH0 settin */
return spi_sync(st->spi, &st->msg[AD7887_CH0]);
}
/**
* ad7887_poll_func_th() th of trigger launched polling to ring buffer
*
* As sampling only occurs on spi 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 ad7887_poll_func_th(struct iio_dev *indio_dev, s64 time)
{
struct ad7887_state *st = indio_dev->dev_data;
schedule_work(&st->poll_work);
return;
}
/**
* ad7887_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 ad7887_poll_bh_to_ring(struct work_struct *work_s)
{
struct ad7887_state *st = container_of(work_s, struct ad7887_state,
poll_work);
struct iio_dev *indio_dev = st->indio_dev;
struct iio_sw_ring_buffer *sw_ring = iio_to_sw_ring(indio_dev->ring);
struct iio_ring_buffer *ring = indio_dev->ring;
s64 time_ns;
__u8 *buf;
int b_sent;
size_t d_size;
unsigned int bytes = ring->scan_count * st->chip_info->storagebits / 8;
/* Ensure the timestamp is 8 byte aligned */
d_size = bytes + 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;
buf = kzalloc(d_size, GFP_KERNEL);
if (buf == NULL)
return;
b_sent = spi_sync(st->spi, st->ring_msg);
if (b_sent)
goto done;
time_ns = iio_get_time_ns();
memcpy(buf, st->data, bytes);
memcpy(buf + d_size - sizeof(s64), &time_ns, sizeof(time_ns));
indio_dev->ring->access.store_to(&sw_ring->buf, buf, time_ns);
done:
kfree(buf);
atomic_dec(&st->protect_ring);
}
int ad7887_register_ring_funcs_and_init(struct iio_dev *indio_dev)
{
struct ad7887_state *st = indio_dev->dev_data;
int ret;
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(&indio_dev->ring->access);
ret = iio_alloc_pollfunc(indio_dev, NULL, &ad7887_poll_func_th);
if (ret)
goto error_deallocate_sw_rb;
/* Ring buffer functions - here trigger setup related */
indio_dev->ring->preenable = &ad7887_ring_preenable;
indio_dev->ring->postenable = &iio_triggered_ring_postenable;
indio_dev->ring->predisable = &iio_triggered_ring_predisable;
indio_dev->ring->postdisable = &ad7887_ring_postdisable;
indio_dev->ring->scan_el_attrs = &ad7887_scan_el_group;
INIT_WORK(&st->poll_work, &ad7887_poll_bh_to_ring);
/* 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 ad7887_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);
}