cregit-Linux how code gets into the kernel

Release 4.8 drivers/iio/light/acpi-als.c

/*
 * 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>
 *
 * 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.
 */

#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; }

Contributors

PersonTokensPropCommitsCommitProp
gabriele mazzottagabriele mazzotta7898.73%150.00%
hartmut knaackhartmut knaack11.27%150.00%
Total79100.00%2100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
gabriele mazzottagabriele mazzotta14396.62%133.33%
gregor boiriegregor boirie32.03%133.33%
hartmut knaackhartmut knaack21.35%133.33%
Total148100.00%3100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
gabriele mazzottagabriele mazzotta10399.04%266.67%
hartmut knaackhartmut knaack10.96%133.33%
Total104100.00%3100.00%

static const struct iio_info acpi_als_info = { .driver_module = THIS_MODULE, .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); }

Contributors

PersonTokensPropCommitsCommitProp
gabriele mazzottagabriele mazzotta160100.00%1100.00%
Total160100.00%1100.00%

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");

Overall Contributors

PersonTokensPropCommitsCommitProp
gabriele mazzottagabriele mazzotta72998.38%250.00%
hartmut knaackhartmut knaack91.21%125.00%
gregor boiriegregor boirie30.40%125.00%
Total741100.00%4100.00%
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.