2009-08-18 19:06:25 +02:00
|
|
|
/*
|
|
|
|
* sca3000_ring.c -- support VTI sca3000 series accelerometers via SPI
|
|
|
|
*
|
|
|
|
* 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.
|
|
|
|
*
|
|
|
|
* Copyright (c) 2009 Jonathan Cameron <jic23@cam.ac.uk>
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <linux/interrupt.h>
|
|
|
|
#include <linux/gpio.h>
|
|
|
|
#include <linux/fs.h>
|
|
|
|
#include <linux/device.h>
|
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 09:04:11 +01:00
|
|
|
#include <linux/slab.h>
|
2009-08-18 19:06:25 +02:00
|
|
|
#include <linux/kernel.h>
|
|
|
|
#include <linux/spi/spi.h>
|
|
|
|
#include <linux/sysfs.h>
|
|
|
|
|
|
|
|
#include "../iio.h"
|
|
|
|
#include "../sysfs.h"
|
|
|
|
#include "../ring_generic.h"
|
|
|
|
#include "../ring_hw.h"
|
|
|
|
#include "accel.h"
|
|
|
|
#include "sca3000.h"
|
|
|
|
|
|
|
|
/* RFC / future work
|
|
|
|
*
|
|
|
|
* The internal ring buffer doesn't actually change what it holds depending
|
|
|
|
* on which signals are enabled etc, merely whether you can read them.
|
|
|
|
* As such the scan mode selection is somewhat different than for a software
|
|
|
|
* ring buffer and changing it actually covers any data already in the buffer.
|
|
|
|
* Currently scan elements aren't configured so it doesn't matter.
|
|
|
|
*/
|
|
|
|
|
|
|
|
/**
|
2011-04-15 19:55:55 +02:00
|
|
|
* sca3000_read_first_n_hw_rb() - main ring access, pulls data from ring
|
2009-08-18 19:06:25 +02:00
|
|
|
* @r: the ring
|
|
|
|
* @count: number of samples to try and pull
|
|
|
|
* @data: output the actual samples pulled from the hw ring
|
|
|
|
* @dead_offset: cheating a bit here: Set to 1 so as to allow for the
|
|
|
|
* leading byte used in bus comms.
|
|
|
|
*
|
|
|
|
* Currently does not provide timestamps. As the hardware doesn't add them they
|
2011-03-31 03:57:33 +02:00
|
|
|
* can only be inferred approximately from ring buffer events such as 50% full
|
2009-08-18 19:06:25 +02:00
|
|
|
* and knowledge of when buffer was last emptied. This is left to userspace.
|
|
|
|
**/
|
2011-04-15 19:55:55 +02:00
|
|
|
static int sca3000_read_first_n_hw_rb(struct iio_ring_buffer *r,
|
|
|
|
size_t count, u8 **data, int *dead_offset)
|
2009-08-18 19:06:25 +02:00
|
|
|
{
|
|
|
|
struct iio_hw_ring_buffer *hw_ring = iio_to_hw_ring_buf(r);
|
|
|
|
struct iio_dev *indio_dev = hw_ring->private;
|
|
|
|
struct sca3000_state *st = indio_dev->dev_data;
|
|
|
|
u8 *rx;
|
2010-09-09 17:40:11 +02:00
|
|
|
s16 *samples;
|
|
|
|
int ret, i, num_available, num_read = 0;
|
2009-08-18 19:06:25 +02:00
|
|
|
int bytes_per_sample = 1;
|
|
|
|
|
|
|
|
if (st->bpse == 11)
|
|
|
|
bytes_per_sample = 2;
|
|
|
|
|
|
|
|
mutex_lock(&st->lock);
|
|
|
|
/* Check how much data is available:
|
|
|
|
* RFC: Implement an ioctl to not bother checking whether there
|
|
|
|
* is enough data in the ring? Afterall, if we are responding
|
|
|
|
* to an interrupt we have a minimum content guaranteed so it
|
|
|
|
* seems slight silly to waste time checking it is there.
|
|
|
|
*/
|
|
|
|
ret = sca3000_read_data(st,
|
|
|
|
SCA3000_REG_ADDR_BUF_COUNT,
|
|
|
|
&rx, 1);
|
|
|
|
if (ret)
|
|
|
|
goto error_ret;
|
|
|
|
else
|
|
|
|
num_available = rx[1];
|
|
|
|
/* num_available is the total number of samples available
|
|
|
|
* i.e. number of time points * number of channels.
|
|
|
|
*/
|
|
|
|
kfree(rx);
|
|
|
|
if (count > num_available * bytes_per_sample)
|
|
|
|
num_read = num_available*bytes_per_sample;
|
|
|
|
else
|
|
|
|
num_read = count - (count % (bytes_per_sample));
|
|
|
|
|
|
|
|
/* Avoid the read request byte */
|
|
|
|
*dead_offset = 1;
|
|
|
|
ret = sca3000_read_data(st,
|
|
|
|
SCA3000_REG_ADDR_RING_OUT,
|
|
|
|
data, num_read);
|
2010-09-09 17:40:11 +02:00
|
|
|
|
|
|
|
/* Convert byte order and shift to default resolution */
|
|
|
|
if (st->bpse == 11) {
|
|
|
|
samples = (s16*)(*data+1);
|
|
|
|
for (i = 0; i < (num_read/2); i++) {
|
|
|
|
samples[i] = be16_to_cpup(
|
|
|
|
(__be16 *)&(samples[i]));
|
|
|
|
samples[i] >>= 3;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2009-08-18 19:06:25 +02:00
|
|
|
error_ret:
|
|
|
|
mutex_unlock(&st->lock);
|
|
|
|
|
|
|
|
return ret ? ret : num_read;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* This is only valid with all 3 elements enabled */
|
|
|
|
static int sca3000_ring_get_length(struct iio_ring_buffer *r)
|
|
|
|
{
|
|
|
|
return 64;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* only valid if resolution is kept at 11bits */
|
2010-08-31 11:32:50 +02:00
|
|
|
static int sca3000_ring_get_bytes_per_datum(struct iio_ring_buffer *r)
|
2009-08-18 19:06:25 +02:00
|
|
|
{
|
|
|
|
return 6;
|
|
|
|
}
|
|
|
|
static void sca3000_ring_release(struct device *dev)
|
|
|
|
{
|
|
|
|
struct iio_ring_buffer *r = to_iio_ring_buffer(dev);
|
|
|
|
kfree(iio_to_hw_ring_buf(r));
|
|
|
|
}
|
|
|
|
|
|
|
|
static IIO_RING_ENABLE_ATTR;
|
2010-08-31 11:32:50 +02:00
|
|
|
static IIO_RING_BYTES_PER_DATUM_ATTR;
|
2009-08-18 19:06:25 +02:00
|
|
|
static IIO_RING_LENGTH_ATTR;
|
|
|
|
|
|
|
|
/**
|
|
|
|
* sca3000_show_ring_bpse() -sysfs function to query bits per sample from ring
|
|
|
|
* @dev: ring buffer device
|
|
|
|
* @attr: this device attribute
|
|
|
|
* @buf: buffer to write to
|
|
|
|
**/
|
|
|
|
static ssize_t sca3000_show_ring_bpse(struct device *dev,
|
|
|
|
struct device_attribute *attr,
|
|
|
|
char *buf)
|
|
|
|
{
|
|
|
|
int len = 0, ret;
|
|
|
|
u8 *rx;
|
2010-10-07 14:10:20 +02:00
|
|
|
struct iio_ring_buffer *ring = dev_get_drvdata(dev);
|
|
|
|
struct iio_dev *indio_dev = ring->indio_dev;
|
2010-09-09 17:40:10 +02:00
|
|
|
struct sca3000_state *st = indio_dev->dev_data;
|
2009-08-18 19:06:25 +02:00
|
|
|
|
|
|
|
mutex_lock(&st->lock);
|
|
|
|
ret = sca3000_read_data(st, SCA3000_REG_ADDR_MODE, &rx, 1);
|
|
|
|
if (ret)
|
|
|
|
goto error_ret;
|
2010-09-21 15:40:51 +02:00
|
|
|
if (rx[1] & SCA3000_RING_BUF_8BIT)
|
|
|
|
len = sprintf(buf, "s8/8\n");
|
|
|
|
else
|
|
|
|
len = sprintf(buf, "s11/16\n");
|
2009-08-18 19:06:25 +02:00
|
|
|
kfree(rx);
|
|
|
|
error_ret:
|
|
|
|
mutex_unlock(&st->lock);
|
|
|
|
|
|
|
|
return ret ? ret : len;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* sca3000_store_ring_bpse() - bits per scan element
|
|
|
|
* @dev: ring buffer device
|
|
|
|
* @attr: attribute called from
|
|
|
|
* @buf: input from userspace
|
|
|
|
* @len: length of input
|
|
|
|
**/
|
|
|
|
static ssize_t sca3000_store_ring_bpse(struct device *dev,
|
|
|
|
struct device_attribute *attr,
|
|
|
|
const char *buf,
|
|
|
|
size_t len)
|
|
|
|
{
|
2010-10-07 14:10:20 +02:00
|
|
|
struct iio_ring_buffer *ring = dev_get_drvdata(dev);
|
|
|
|
struct iio_dev *indio_dev = ring->indio_dev;
|
2010-09-09 17:40:10 +02:00
|
|
|
struct sca3000_state *st = indio_dev->dev_data;
|
2009-08-18 19:06:25 +02:00
|
|
|
int ret;
|
|
|
|
u8 *rx;
|
|
|
|
|
|
|
|
mutex_lock(&st->lock);
|
|
|
|
|
|
|
|
ret = sca3000_read_data(st, SCA3000_REG_ADDR_MODE, &rx, 1);
|
2010-09-21 15:40:51 +02:00
|
|
|
if (ret)
|
|
|
|
goto error_ret;
|
|
|
|
if (strncmp(buf, "s8/8", 4) == 0) {
|
|
|
|
ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE,
|
|
|
|
rx[1] | SCA3000_RING_BUF_8BIT);
|
|
|
|
st->bpse = 8;
|
|
|
|
} else if (strncmp(buf, "s11/16", 5) == 0) {
|
|
|
|
ret = sca3000_write_reg(st, SCA3000_REG_ADDR_MODE,
|
|
|
|
rx[1] & ~SCA3000_RING_BUF_8BIT);
|
|
|
|
st->bpse = 11;
|
|
|
|
} else
|
|
|
|
ret = -EINVAL;
|
|
|
|
error_ret:
|
2009-08-18 19:06:25 +02:00
|
|
|
mutex_unlock(&st->lock);
|
|
|
|
|
|
|
|
return ret ? ret : len;
|
|
|
|
}
|
|
|
|
|
2010-09-21 15:40:56 +02:00
|
|
|
static IIO_SCAN_EL_C(accel_x, 0, 0, NULL);
|
|
|
|
static IIO_SCAN_EL_C(accel_y, 1, 0, NULL);
|
|
|
|
static IIO_SCAN_EL_C(accel_z, 2, 0, NULL);
|
2010-09-21 15:40:51 +02:00
|
|
|
static IIO_CONST_ATTR(accel_type_available, "s8/8 s11/16");
|
|
|
|
static IIO_DEVICE_ATTR(accel_type,
|
2010-05-04 15:42:58 +02:00
|
|
|
S_IRUGO | S_IWUSR,
|
|
|
|
sca3000_show_ring_bpse,
|
|
|
|
sca3000_store_ring_bpse,
|
|
|
|
0);
|
2009-08-18 19:06:25 +02:00
|
|
|
|
2010-05-04 15:42:58 +02:00
|
|
|
static struct attribute *sca3000_scan_el_attrs[] = {
|
|
|
|
&iio_scan_el_accel_x.dev_attr.attr,
|
2010-09-21 15:41:06 +02:00
|
|
|
&iio_const_attr_accel_x_index.dev_attr.attr,
|
2010-05-04 15:42:58 +02:00
|
|
|
&iio_scan_el_accel_y.dev_attr.attr,
|
2010-09-21 15:41:06 +02:00
|
|
|
&iio_const_attr_accel_y_index.dev_attr.attr,
|
2010-05-04 15:42:58 +02:00
|
|
|
&iio_scan_el_accel_z.dev_attr.attr,
|
2010-09-21 15:41:06 +02:00
|
|
|
&iio_const_attr_accel_z_index.dev_attr.attr,
|
2010-09-21 15:40:51 +02:00
|
|
|
&iio_const_attr_accel_type_available.dev_attr.attr,
|
|
|
|
&iio_dev_attr_accel_type.dev_attr.attr,
|
2010-05-04 15:42:58 +02:00
|
|
|
NULL
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct attribute_group sca3000_scan_el_group = {
|
|
|
|
.attrs = sca3000_scan_el_attrs,
|
|
|
|
.name = "scan_elements",
|
|
|
|
};
|
2009-08-18 19:06:25 +02:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Ring buffer attributes
|
|
|
|
* This device is a bit unusual in that the sampling frequency and bpse
|
|
|
|
* only apply to the ring buffer. At all times full rate and accuracy
|
|
|
|
* is available via direct reading from registers.
|
|
|
|
*/
|
2010-05-04 15:42:58 +02:00
|
|
|
static struct attribute *sca3000_ring_attributes[] = {
|
2009-08-18 19:06:25 +02:00
|
|
|
&dev_attr_length.attr,
|
2010-08-31 11:32:50 +02:00
|
|
|
&dev_attr_bytes_per_datum.attr,
|
|
|
|
&dev_attr_enable.attr,
|
2009-08-18 19:06:25 +02:00
|
|
|
NULL,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct attribute_group sca3000_ring_attr = {
|
2010-05-04 15:42:58 +02:00
|
|
|
.attrs = sca3000_ring_attributes,
|
2009-08-18 19:06:25 +02:00
|
|
|
};
|
|
|
|
|
2009-08-19 17:59:31 +02:00
|
|
|
static const struct attribute_group *sca3000_ring_attr_groups[] = {
|
2009-08-18 19:06:25 +02:00
|
|
|
&sca3000_ring_attr,
|
|
|
|
NULL
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct device_type sca3000_ring_type = {
|
|
|
|
.release = sca3000_ring_release,
|
|
|
|
.groups = sca3000_ring_attr_groups,
|
|
|
|
};
|
|
|
|
|
|
|
|
static struct iio_ring_buffer *sca3000_rb_allocate(struct iio_dev *indio_dev)
|
|
|
|
{
|
|
|
|
struct iio_ring_buffer *buf;
|
|
|
|
struct iio_hw_ring_buffer *ring;
|
|
|
|
|
|
|
|
ring = kzalloc(sizeof *ring, GFP_KERNEL);
|
|
|
|
if (!ring)
|
2010-05-05 07:32:01 +02:00
|
|
|
return NULL;
|
2009-08-18 19:06:25 +02:00
|
|
|
ring->private = indio_dev;
|
|
|
|
buf = &ring->buf;
|
|
|
|
iio_ring_buffer_init(buf, indio_dev);
|
|
|
|
buf->dev.type = &sca3000_ring_type;
|
|
|
|
device_initialize(&buf->dev);
|
|
|
|
buf->dev.parent = &indio_dev->dev;
|
|
|
|
dev_set_drvdata(&buf->dev, (void *)buf);
|
|
|
|
|
|
|
|
return buf;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline void sca3000_rb_free(struct iio_ring_buffer *r)
|
|
|
|
{
|
|
|
|
if (r)
|
|
|
|
iio_put_ring_buffer(r);
|
|
|
|
}
|
|
|
|
|
|
|
|
int sca3000_configure_ring(struct iio_dev *indio_dev)
|
|
|
|
{
|
|
|
|
indio_dev->ring = sca3000_rb_allocate(indio_dev);
|
|
|
|
if (indio_dev->ring == NULL)
|
|
|
|
return -ENOMEM;
|
|
|
|
indio_dev->modes |= INDIO_RING_HARDWARE_BUFFER;
|
|
|
|
|
2010-08-31 11:32:52 +02:00
|
|
|
indio_dev->ring->scan_el_attrs = &sca3000_scan_el_group;
|
2011-04-15 19:55:55 +02:00
|
|
|
indio_dev->ring->access.read_first_n = &sca3000_read_first_n_hw_rb;
|
2009-08-18 19:06:25 +02:00
|
|
|
indio_dev->ring->access.get_length = &sca3000_ring_get_length;
|
2010-08-31 11:32:50 +02:00
|
|
|
indio_dev->ring->access.get_bytes_per_datum = &sca3000_ring_get_bytes_per_datum;
|
2009-08-18 19:06:25 +02:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
void sca3000_unconfigure_ring(struct iio_dev *indio_dev)
|
|
|
|
{
|
|
|
|
sca3000_rb_free(indio_dev->ring);
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline
|
|
|
|
int __sca3000_hw_ring_state_set(struct iio_dev *indio_dev, bool state)
|
|
|
|
{
|
|
|
|
struct sca3000_state *st = indio_dev->dev_data;
|
|
|
|
int ret;
|
|
|
|
u8 *rx;
|
|
|
|
|
|
|
|
mutex_lock(&st->lock);
|
|
|
|
ret = sca3000_read_data(st, SCA3000_REG_ADDR_MODE, &rx, 1);
|
|
|
|
if (ret)
|
|
|
|
goto error_ret;
|
|
|
|
if (state) {
|
|
|
|
printk(KERN_INFO "supposedly enabling ring buffer\n");
|
|
|
|
ret = sca3000_write_reg(st,
|
|
|
|
SCA3000_REG_ADDR_MODE,
|
|
|
|
(rx[1] | SCA3000_RING_BUF_ENABLE));
|
|
|
|
} else
|
|
|
|
ret = sca3000_write_reg(st,
|
|
|
|
SCA3000_REG_ADDR_MODE,
|
|
|
|
(rx[1] & ~SCA3000_RING_BUF_ENABLE));
|
|
|
|
kfree(rx);
|
|
|
|
error_ret:
|
|
|
|
mutex_unlock(&st->lock);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
/**
|
|
|
|
* sca3000_hw_ring_preenable() hw ring buffer preenable function
|
|
|
|
*
|
|
|
|
* Very simple enable function as the chip will allows normal reads
|
|
|
|
* during ring buffer operation so as long as it is indeed running
|
|
|
|
* before we notify the core, the precise ordering does not matter.
|
|
|
|
**/
|
|
|
|
static int sca3000_hw_ring_preenable(struct iio_dev *indio_dev)
|
|
|
|
{
|
|
|
|
return __sca3000_hw_ring_state_set(indio_dev, 1);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int sca3000_hw_ring_postdisable(struct iio_dev *indio_dev)
|
|
|
|
{
|
|
|
|
return __sca3000_hw_ring_state_set(indio_dev, 0);
|
|
|
|
}
|
|
|
|
|
|
|
|
void sca3000_register_ring_funcs(struct iio_dev *indio_dev)
|
|
|
|
{
|
|
|
|
indio_dev->ring->preenable = &sca3000_hw_ring_preenable;
|
|
|
|
indio_dev->ring->postdisable = &sca3000_hw_ring_postdisable;
|
|
|
|
}
|
|
|
|
|
|
|
|
/**
|
|
|
|
* sca3000_ring_int_process() ring specific interrupt handling.
|
|
|
|
*
|
|
|
|
* This is only split from the main interrupt handler so as to
|
|
|
|
* reduce the amount of code if the ring buffer is not enabled.
|
|
|
|
**/
|
|
|
|
void sca3000_ring_int_process(u8 val, struct iio_ring_buffer *ring)
|
|
|
|
{
|
|
|
|
if (val & SCA3000_INT_STATUS_THREE_QUARTERS)
|
|
|
|
iio_push_or_escallate_ring_event(ring,
|
|
|
|
IIO_EVENT_CODE_RING_75_FULL,
|
|
|
|
0);
|
|
|
|
else if (val & SCA3000_INT_STATUS_HALF)
|
|
|
|
iio_push_ring_event(ring,
|
|
|
|
IIO_EVENT_CODE_RING_50_FULL, 0);
|
|
|
|
}
|