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