kernel_optimize_test/drivers/iio/light/acpi-als.c
Thomas Gleixner 1a59d1b8e0 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license as published by
  the free software foundation either version 2 of the license or at
  your option any later version this program is distributed in the
  hope that it will be useful but without any warranty without even
  the implied warranty of merchantability or fitness for a particular
  purpose see the gnu general public license for more details you
  should have received a copy of the gnu general public license along
  with this program if not write to the free software foundation inc
  59 temple place suite 330 boston ma 02111 1307 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 1334 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:35 -07:00

220 lines
5.4 KiB
C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ACPI Ambient Light Sensor Driver
*
* Based on ALS driver:
* Copyright (C) 2009 Zhang Rui <rui.zhang@intel.com>
*
* Rework for IIO subsystem:
* Copyright (C) 2012-2013 Martin Liska <marxin.liska@gmail.com>
*
* Final cleanup and debugging:
* Copyright (C) 2013-2014 Marek Vasut <marex@denx.de>
* Copyright (C) 2015 Gabriele Mazzotta <gabriele.mzt@gmail.com>
*/
#include <linux/module.h>
#include <linux/acpi.h>
#include <linux/err.h>
#include <linux/mutex.h>
#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
#include <linux/iio/kfifo_buf.h>
#define ACPI_ALS_CLASS "als"
#define ACPI_ALS_DEVICE_NAME "acpi-als"
#define ACPI_ALS_NOTIFY_ILLUMINANCE 0x80
ACPI_MODULE_NAME("acpi-als");
/*
* So far, there's only one channel in here, but the specification for
* ACPI0008 says there can be more to what the block can report. Like
* chromaticity and such. We are ready for incoming additions!
*/
static const struct iio_chan_spec acpi_als_channels[] = {
{
.type = IIO_LIGHT,
.scan_type = {
.sign = 's',
.realbits = 32,
.storagebits = 32,
},
/* _RAW is here for backward ABI compatibility */
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
BIT(IIO_CHAN_INFO_PROCESSED),
},
};
/*
* The event buffer contains timestamp and all the data from
* the ACPI0008 block. There are multiple, but so far we only
* support _ALI (illuminance). Once someone adds new channels
* to acpi_als_channels[], the evt_buffer below will grow
* automatically.
*/
#define ACPI_ALS_EVT_NR_SOURCES ARRAY_SIZE(acpi_als_channels)
#define ACPI_ALS_EVT_BUFFER_SIZE \
(sizeof(s64) + (ACPI_ALS_EVT_NR_SOURCES * sizeof(s32)))
struct acpi_als {
struct acpi_device *device;
struct mutex lock;
s32 evt_buffer[ACPI_ALS_EVT_BUFFER_SIZE];
};
/*
* All types of properties the ACPI0008 block can report. The ALI, ALC, ALT
* and ALP can all be handled by acpi_als_read_value() below, while the ALR is
* special.
*
* The _ALR property returns tables that can be used to fine-tune the values
* reported by the other props based on the particular hardware type and it's
* location (it contains tables for "rainy", "bright inhouse lighting" etc.).
*
* So far, we support only ALI (illuminance).
*/
#define ACPI_ALS_ILLUMINANCE "_ALI"
#define ACPI_ALS_CHROMATICITY "_ALC"
#define ACPI_ALS_COLOR_TEMP "_ALT"
#define ACPI_ALS_POLLING "_ALP"
#define ACPI_ALS_TABLES "_ALR"
static int acpi_als_read_value(struct acpi_als *als, char *prop, s32 *val)
{
unsigned long long temp_val;
acpi_status status;
status = acpi_evaluate_integer(als->device->handle, prop, NULL,
&temp_val);
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status, "Error reading ALS %s", prop));
return -EIO;
}
*val = temp_val;
return 0;
}
static void acpi_als_notify(struct acpi_device *device, u32 event)
{
struct iio_dev *indio_dev = acpi_driver_data(device);
struct acpi_als *als = iio_priv(indio_dev);
s32 *buffer = als->evt_buffer;
s64 time_ns = iio_get_time_ns(indio_dev);
s32 val;
int ret;
mutex_lock(&als->lock);
memset(buffer, 0, ACPI_ALS_EVT_BUFFER_SIZE);
switch (event) {
case ACPI_ALS_NOTIFY_ILLUMINANCE:
ret = acpi_als_read_value(als, ACPI_ALS_ILLUMINANCE, &val);
if (ret < 0)
goto out;
*buffer++ = val;
break;
default:
/* Unhandled event */
dev_dbg(&device->dev, "Unhandled ACPI ALS event (%08x)!\n",
event);
goto out;
}
iio_push_to_buffers_with_timestamp(indio_dev, als->evt_buffer, time_ns);
out:
mutex_unlock(&als->lock);
}
static int acpi_als_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val,
int *val2, long mask)
{
struct acpi_als *als = iio_priv(indio_dev);
s32 temp_val;
int ret;
if ((mask != IIO_CHAN_INFO_PROCESSED) && (mask != IIO_CHAN_INFO_RAW))
return -EINVAL;
/* we support only illumination (_ALI) so far. */
if (chan->type != IIO_LIGHT)
return -EINVAL;
ret = acpi_als_read_value(als, ACPI_ALS_ILLUMINANCE, &temp_val);
if (ret < 0)
return ret;
*val = temp_val;
return IIO_VAL_INT;
}
static const struct iio_info acpi_als_info = {
.read_raw = acpi_als_read_raw,
};
static int acpi_als_add(struct acpi_device *device)
{
struct acpi_als *als;
struct iio_dev *indio_dev;
struct iio_buffer *buffer;
indio_dev = devm_iio_device_alloc(&device->dev, sizeof(*als));
if (!indio_dev)
return -ENOMEM;
als = iio_priv(indio_dev);
device->driver_data = indio_dev;
als->device = device;
mutex_init(&als->lock);
indio_dev->name = ACPI_ALS_DEVICE_NAME;
indio_dev->dev.parent = &device->dev;
indio_dev->info = &acpi_als_info;
indio_dev->modes = INDIO_BUFFER_SOFTWARE;
indio_dev->channels = acpi_als_channels;
indio_dev->num_channels = ARRAY_SIZE(acpi_als_channels);
buffer = devm_iio_kfifo_allocate(&device->dev);
if (!buffer)
return -ENOMEM;
iio_device_attach_buffer(indio_dev, buffer);
return devm_iio_device_register(&device->dev, indio_dev);
}
static const struct acpi_device_id acpi_als_device_ids[] = {
{"ACPI0008", 0},
{},
};
MODULE_DEVICE_TABLE(acpi, acpi_als_device_ids);
static struct acpi_driver acpi_als_driver = {
.name = "acpi_als",
.class = ACPI_ALS_CLASS,
.ids = acpi_als_device_ids,
.ops = {
.add = acpi_als_add,
.notify = acpi_als_notify,
},
};
module_acpi_driver(acpi_als_driver);
MODULE_AUTHOR("Zhang Rui <rui.zhang@intel.com>");
MODULE_AUTHOR("Martin Liska <marxin.liska@gmail.com>");
MODULE_AUTHOR("Marek Vasut <marex@denx.de>");
MODULE_DESCRIPTION("ACPI Ambient Light Sensor Driver");
MODULE_LICENSE("GPL");