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15ea2878bf
Continuing from Alexandru Ardelean's introduction of the split between driver modifiable fields and those that should only be set by the core. This could have been done in two steps to make the actual move after introducing iio_device_id() but there seemed limited point to that given how mechanical the majority of the patch is. Includes fixup from Alex for missing mxs-lradc-adc conversion. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Alexandru Ardelean <ardeleanalex@gmail.com> Link: https://lore.kernel.org/r/20210426174911.397061-2-jic23@kernel.org
255 lines
6.4 KiB
C
255 lines
6.4 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/irq.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/trigger.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/trigger_consumer.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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/*
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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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IIO_CHAN_SOFT_TIMESTAMP(1),
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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): One channel, padding and timestamp.
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*/
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#define ACPI_ALS_EVT_BUFFER_SIZE \
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(sizeof(s32) + sizeof(s32) + sizeof(s64))
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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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struct iio_trigger *trig;
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s32 evt_buffer[ACPI_ALS_EVT_BUFFER_SIZE / sizeof(s32)] __aligned(8);
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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_evaluation_failure_warn(als->device->handle, prop, status);
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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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if (iio_buffer_enabled(indio_dev) && iio_trigger_using_own(indio_dev)) {
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switch (event) {
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case ACPI_ALS_NOTIFY_ILLUMINANCE:
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iio_trigger_poll_chained(als->trig);
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break;
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default:
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/* Unhandled event */
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dev_dbg(&device->dev,
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"Unhandled ACPI ALS event (%08x)!\n",
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event);
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}
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}
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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 irqreturn_t acpi_als_trigger_handler(int irq, void *p)
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{
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struct iio_poll_func *pf = p;
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struct iio_dev *indio_dev = pf->indio_dev;
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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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s32 val;
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int ret;
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mutex_lock(&als->lock);
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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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/*
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* When coming from own trigger via polls, set polling function
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* timestamp here. Given ACPI notifier is already in a thread and call
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* function directly, there is no need to set the timestamp in the
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* notify function.
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*
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* If the timestamp was actually 0, the timestamp is set one more time.
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*/
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if (!pf->timestamp)
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pf->timestamp = iio_get_time_ns(indio_dev);
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iio_push_to_buffers_with_timestamp(indio_dev, buffer, pf->timestamp);
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out:
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mutex_unlock(&als->lock);
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iio_trigger_notify_done(indio_dev->trig);
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return IRQ_HANDLED;
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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 device *dev = &device->dev;
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struct iio_dev *indio_dev;
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struct acpi_als *als;
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int ret;
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indio_dev = devm_iio_device_alloc(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->info = &acpi_als_info;
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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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als->trig = devm_iio_trigger_alloc(dev, "%s-dev%d", indio_dev->name,
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iio_device_id(indio_dev));
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if (!als->trig)
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return -ENOMEM;
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ret = devm_iio_trigger_register(dev, als->trig);
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if (ret)
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return ret;
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/*
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* Set hardware trigger by default to let events flow when
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* BIOS support notification.
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*/
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indio_dev->trig = iio_trigger_get(als->trig);
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ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
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iio_pollfunc_store_time,
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acpi_als_trigger_handler,
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NULL);
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if (ret)
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return ret;
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return devm_iio_device_register(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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