linux/drivers/iio/accel/kxsd9.c

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/*
* kxsd9.c simple support for the Kionix KXSD9 3D
* accelerometer.
*
* Copyright (c) 2008-2009 Jonathan Cameron <jic23@kernel.org>
*
* 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.
*
* The i2c interface is very similar, so shouldn't be a problem once
* I have a suitable wire made up.
*
* TODO: Support the motion detector
*/
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/sysfs.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 08:04:11 +00:00
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/regulator/consumer.h>
#include <linux/pm_runtime.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/buffer.h>
#include <linux/iio/triggered_buffer.h>
#include <linux/iio/trigger_consumer.h>
#include "kxsd9.h"
#define KXSD9_REG_X 0x00
#define KXSD9_REG_Y 0x02
#define KXSD9_REG_Z 0x04
#define KXSD9_REG_AUX 0x06
#define KXSD9_REG_RESET 0x0a
#define KXSD9_REG_CTRL_C 0x0c
#define KXSD9_CTRL_C_FS_MASK 0x03
#define KXSD9_CTRL_C_FS_8G 0x00
#define KXSD9_CTRL_C_FS_6G 0x01
#define KXSD9_CTRL_C_FS_4G 0x02
#define KXSD9_CTRL_C_FS_2G 0x03
#define KXSD9_CTRL_C_MOT_LAT BIT(3)
#define KXSD9_CTRL_C_MOT_LEV BIT(4)
#define KXSD9_CTRL_C_LP_MASK 0xe0
#define KXSD9_CTRL_C_LP_NONE 0x00
#define KXSD9_CTRL_C_LP_2000HZC BIT(5)
#define KXSD9_CTRL_C_LP_2000HZB BIT(6)
#define KXSD9_CTRL_C_LP_2000HZA (BIT(5)|BIT(6))
#define KXSD9_CTRL_C_LP_1000HZ BIT(7)
#define KXSD9_CTRL_C_LP_500HZ (BIT(7)|BIT(5))
#define KXSD9_CTRL_C_LP_100HZ (BIT(7)|BIT(6))
#define KXSD9_CTRL_C_LP_50HZ (BIT(7)|BIT(6)|BIT(5))
#define KXSD9_REG_CTRL_B 0x0d
#define KXSD9_CTRL_B_CLK_HLD BIT(7)
#define KXSD9_CTRL_B_ENABLE BIT(6)
#define KXSD9_CTRL_B_ST BIT(5) /* Self-test */
#define KXSD9_REG_CTRL_A 0x0e
/**
* struct kxsd9_state - device related storage
* @dev: pointer to the parent device
* @map: regmap to the device
* @orientation: mounting matrix, flipped axis etc
* @regs: regulators for this device, VDD and IOVDD
* @scale: the current scaling setting
*/
struct kxsd9_state {
struct device *dev;
struct regmap *map;
struct iio_mount_matrix orientation;
struct regulator_bulk_data regs[2];
u8 scale;
};
#define KXSD9_SCALE_2G "0.011978"
#define KXSD9_SCALE_4G "0.023927"
#define KXSD9_SCALE_6G "0.035934"
#define KXSD9_SCALE_8G "0.047853"
/* reverse order */
static const int kxsd9_micro_scales[4] = { 47853, 35934, 23927, 11978 };
#define KXSD9_ZERO_G_OFFSET -2048
/*
* Regulator names
*/
static const char kxsd9_reg_vdd[] = "vdd";
static const char kxsd9_reg_iovdd[] = "iovdd";
static int kxsd9_write_scale(struct iio_dev *indio_dev, int micro)
{
int ret, i;
struct kxsd9_state *st = iio_priv(indio_dev);
bool foundit = false;
for (i = 0; i < 4; i++)
if (micro == kxsd9_micro_scales[i]) {
foundit = true;
break;
}
if (!foundit)
return -EINVAL;
ret = regmap_update_bits(st->map,
KXSD9_REG_CTRL_C,
KXSD9_CTRL_C_FS_MASK,
i);
if (ret < 0)
goto error_ret;
/* Cached scale when the sensor is powered down */
st->scale = i;
error_ret:
return ret;
}
static IIO_CONST_ATTR(accel_scale_available,
KXSD9_SCALE_2G " "
KXSD9_SCALE_4G " "
KXSD9_SCALE_6G " "
KXSD9_SCALE_8G);
static struct attribute *kxsd9_attributes[] = {
&iio_const_attr_accel_scale_available.dev_attr.attr,
NULL,
};
static int kxsd9_write_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int val,
int val2,
long mask)
{
int ret = -EINVAL;
struct kxsd9_state *st = iio_priv(indio_dev);
pm_runtime_get_sync(st->dev);
if (mask == IIO_CHAN_INFO_SCALE) {
/* Check no integer component */
if (val)
return -EINVAL;
ret = kxsd9_write_scale(indio_dev, val2);
}
pm_runtime_mark_last_busy(st->dev);
pm_runtime_put_autosuspend(st->dev);
return ret;
}
static int kxsd9_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
int ret = -EINVAL;
struct kxsd9_state *st = iio_priv(indio_dev);
unsigned int regval;
__be16 raw_val;
u16 nval;
pm_runtime_get_sync(st->dev);
switch (mask) {
case IIO_CHAN_INFO_RAW:
ret = regmap_bulk_read(st->map, chan->address, &raw_val,
sizeof(raw_val));
if (ret)
goto error_ret;
nval = be16_to_cpu(raw_val);
/* Only 12 bits are valid */
nval >>= 4;
*val = nval;
ret = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_OFFSET:
/* This has a bias of -2048 */
*val = KXSD9_ZERO_G_OFFSET;
ret = IIO_VAL_INT;
break;
case IIO_CHAN_INFO_SCALE:
ret = regmap_read(st->map,
KXSD9_REG_CTRL_C,
&regval);
if (ret < 0)
goto error_ret;
*val = 0;
*val2 = kxsd9_micro_scales[regval & KXSD9_CTRL_C_FS_MASK];
ret = IIO_VAL_INT_PLUS_MICRO;
break;
}
error_ret:
pm_runtime_mark_last_busy(st->dev);
pm_runtime_put_autosuspend(st->dev);
return ret;
};
static irqreturn_t kxsd9_trigger_handler(int irq, void *p)
{
const struct iio_poll_func *pf = p;
struct iio_dev *indio_dev = pf->indio_dev;
struct kxsd9_state *st = iio_priv(indio_dev);
int ret;
/* 4 * 16bit values AND timestamp */
__be16 hw_values[8];
ret = regmap_bulk_read(st->map,
KXSD9_REG_X,
&hw_values,
8);
if (ret) {
dev_err(st->dev,
"error reading data\n");
return ret;
}
iio_push_to_buffers_with_timestamp(indio_dev,
hw_values,
iio_get_time_ns(indio_dev));
iio_trigger_notify_done(indio_dev->trig);
return IRQ_HANDLED;
}
static int kxsd9_buffer_preenable(struct iio_dev *indio_dev)
{
struct kxsd9_state *st = iio_priv(indio_dev);
pm_runtime_get_sync(st->dev);
return 0;
}
static int kxsd9_buffer_postdisable(struct iio_dev *indio_dev)
{
struct kxsd9_state *st = iio_priv(indio_dev);
pm_runtime_mark_last_busy(st->dev);
pm_runtime_put_autosuspend(st->dev);
return 0;
}
static const struct iio_buffer_setup_ops kxsd9_buffer_setup_ops = {
.preenable = kxsd9_buffer_preenable,
.postenable = iio_triggered_buffer_postenable,
.predisable = iio_triggered_buffer_predisable,
.postdisable = kxsd9_buffer_postdisable,
};
static const struct iio_mount_matrix *
kxsd9_get_mount_matrix(const struct iio_dev *indio_dev,
const struct iio_chan_spec *chan)
{
struct kxsd9_state *st = iio_priv(indio_dev);
return &st->orientation;
}
static const struct iio_chan_spec_ext_info kxsd9_ext_info[] = {
IIO_MOUNT_MATRIX(IIO_SHARED_BY_TYPE, kxsd9_get_mount_matrix),
{ },
};
#define KXSD9_ACCEL_CHAN(axis, index) \
{ \
.type = IIO_ACCEL, \
.modified = 1, \
.channel2 = IIO_MOD_##axis, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
BIT(IIO_CHAN_INFO_OFFSET), \
.ext_info = kxsd9_ext_info, \
.address = KXSD9_REG_##axis, \
.scan_index = index, \
.scan_type = { \
.sign = 'u', \
.realbits = 12, \
.storagebits = 16, \
.shift = 4, \
.endianness = IIO_BE, \
}, \
}
static const struct iio_chan_spec kxsd9_channels[] = {
KXSD9_ACCEL_CHAN(X, 0),
KXSD9_ACCEL_CHAN(Y, 1),
KXSD9_ACCEL_CHAN(Z, 2),
{
.type = IIO_VOLTAGE,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.indexed = 1,
.address = KXSD9_REG_AUX,
.scan_index = 3,
.scan_type = {
.sign = 'u',
.realbits = 12,
.storagebits = 16,
.shift = 4,
.endianness = IIO_BE,
},
},
IIO_CHAN_SOFT_TIMESTAMP(4),
};
static const struct attribute_group kxsd9_attribute_group = {
.attrs = kxsd9_attributes,
};
static int kxsd9_power_up(struct kxsd9_state *st)
{
int ret;
/* Enable the regulators */
ret = regulator_bulk_enable(ARRAY_SIZE(st->regs), st->regs);
if (ret) {
dev_err(st->dev, "Cannot enable regulators\n");
return ret;
}
/* Power up */
ret = regmap_write(st->map,
KXSD9_REG_CTRL_B,
KXSD9_CTRL_B_ENABLE);
if (ret)
return ret;
/*
* Set 1000Hz LPF, 2g fullscale, motion wakeup threshold 1g,
* latched wakeup
*/
ret = regmap_write(st->map,
KXSD9_REG_CTRL_C,
KXSD9_CTRL_C_LP_1000HZ |
KXSD9_CTRL_C_MOT_LEV |
KXSD9_CTRL_C_MOT_LAT |
st->scale);
if (ret)
return ret;
/*
* Power-up time depends on the LPF setting, but typ 15.9 ms, let's
* set 20 ms to allow for some slack.
*/
msleep(20);
return 0;
};
static int kxsd9_power_down(struct kxsd9_state *st)
{
int ret;
/*
* Set into low power mode - since there may be more users of the
* regulators this is the first step of the power saving: it will
* make sure we conserve power even if there are others users on the
* regulators.
*/
ret = regmap_update_bits(st->map,
KXSD9_REG_CTRL_B,
KXSD9_CTRL_B_ENABLE,
0);
if (ret)
return ret;
/* Disable the regulators */
ret = regulator_bulk_disable(ARRAY_SIZE(st->regs), st->regs);
if (ret) {
dev_err(st->dev, "Cannot disable regulators\n");
return ret;
}
return 0;
}
static const struct iio_info kxsd9_info = {
.read_raw = &kxsd9_read_raw,
.write_raw = &kxsd9_write_raw,
.attrs = &kxsd9_attribute_group,
};
/* Four channels apart from timestamp, scan mask = 0x0f */
static const unsigned long kxsd9_scan_masks[] = { 0xf, 0 };
int kxsd9_common_probe(struct device *dev,
struct regmap *map,
const char *name)
{
struct iio_dev *indio_dev;
struct kxsd9_state *st;
int ret;
indio_dev = devm_iio_device_alloc(dev, sizeof(*st));
if (!indio_dev)
return -ENOMEM;
st = iio_priv(indio_dev);
st->dev = dev;
st->map = map;
indio_dev->channels = kxsd9_channels;
indio_dev->num_channels = ARRAY_SIZE(kxsd9_channels);
indio_dev->name = name;
indio_dev->dev.parent = dev;
indio_dev->info = &kxsd9_info;
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->available_scan_masks = kxsd9_scan_masks;
/* Read the mounting matrix, if present */
ret = of_iio_read_mount_matrix(dev,
"mount-matrix",
&st->orientation);
if (ret)
return ret;
/* Fetch and turn on regulators */
st->regs[0].supply = kxsd9_reg_vdd;
st->regs[1].supply = kxsd9_reg_iovdd;
ret = devm_regulator_bulk_get(dev,
ARRAY_SIZE(st->regs),
st->regs);
if (ret) {
dev_err(dev, "Cannot get regulators\n");
return ret;
}
/* Default scaling */
st->scale = KXSD9_CTRL_C_FS_2G;
kxsd9_power_up(st);
ret = iio_triggered_buffer_setup(indio_dev,
iio_pollfunc_store_time,
kxsd9_trigger_handler,
&kxsd9_buffer_setup_ops);
if (ret) {
dev_err(dev, "triggered buffer setup failed\n");
goto err_power_down;
}
ret = iio_device_register(indio_dev);
if (ret)
goto err_cleanup_buffer;
dev_set_drvdata(dev, indio_dev);
/* Enable runtime PM */
pm_runtime_get_noresume(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
/*
* Set autosuspend to two orders of magnitude larger than the
* start-up time. 20ms start-up time means 2000ms autosuspend,
* i.e. 2 seconds.
*/
pm_runtime_set_autosuspend_delay(dev, 2000);
pm_runtime_use_autosuspend(dev);
pm_runtime_put(dev);
return 0;
err_cleanup_buffer:
iio_triggered_buffer_cleanup(indio_dev);
err_power_down:
kxsd9_power_down(st);
return ret;
}
EXPORT_SYMBOL(kxsd9_common_probe);
int kxsd9_common_remove(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct kxsd9_state *st = iio_priv(indio_dev);
iio_triggered_buffer_cleanup(indio_dev);
iio_device_unregister(indio_dev);
pm_runtime_get_sync(dev);
pm_runtime_put_noidle(dev);
pm_runtime_disable(dev);
kxsd9_power_down(st);
return 0;
}
EXPORT_SYMBOL(kxsd9_common_remove);
#ifdef CONFIG_PM
static int kxsd9_runtime_suspend(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct kxsd9_state *st = iio_priv(indio_dev);
return kxsd9_power_down(st);
}
static int kxsd9_runtime_resume(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct kxsd9_state *st = iio_priv(indio_dev);
return kxsd9_power_up(st);
}
#endif /* CONFIG_PM */
const struct dev_pm_ops kxsd9_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
pm_runtime_force_resume)
SET_RUNTIME_PM_OPS(kxsd9_runtime_suspend,
kxsd9_runtime_resume, NULL)
};
EXPORT_SYMBOL(kxsd9_dev_pm_ops);
MODULE_AUTHOR("Jonathan Cameron <jic23@kernel.org>");
MODULE_DESCRIPTION("Kionix KXSD9 driver");
MODULE_LICENSE("GPL v2");