2ce8284c31
The DT of_device.h and of_platform.h date back to the separate of_platform_bus_type before it as merged into the regular platform bus. As part of that merge prepping Arm DT support 13 years ago, they "temporarily" include each other. They also include platform_device.h and of.h. As a result, there's a pretty much random mix of those include files used throughout the tree. In order to detangle these headers and replace the implicit includes with struct declarations, users need to explicitly include the correct includes. Acked-by: David Lechner <david@lechnology.com> Signed-off-by: Rob Herring <robh@kernel.org> Reviewed-by: Simon Glass <sjg@chromium.org> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
102 lines
2.2 KiB
C
102 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Generic Syscon Poweroff Driver
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*
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* Copyright (c) 2015, National Instruments Corp.
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* Author: Moritz Fischer <moritz.fischer@ettus.com>
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*/
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#include <linux/delay.h>
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#include <linux/io.h>
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#include <linux/notifier.h>
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#include <linux/mfd/syscon.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/regmap.h>
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static struct regmap *map;
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static u32 offset;
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static u32 value;
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static u32 mask;
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static void syscon_poweroff(void)
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{
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/* Issue the poweroff */
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regmap_update_bits(map, offset, mask, value);
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mdelay(1000);
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pr_emerg("Unable to poweroff system\n");
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}
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static int syscon_poweroff_probe(struct platform_device *pdev)
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{
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int mask_err, value_err;
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map = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "regmap");
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if (IS_ERR(map)) {
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dev_err(&pdev->dev, "unable to get syscon");
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return PTR_ERR(map);
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}
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if (of_property_read_u32(pdev->dev.of_node, "offset", &offset)) {
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dev_err(&pdev->dev, "unable to read 'offset'");
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return -EINVAL;
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}
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value_err = of_property_read_u32(pdev->dev.of_node, "value", &value);
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mask_err = of_property_read_u32(pdev->dev.of_node, "mask", &mask);
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if (value_err && mask_err) {
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dev_err(&pdev->dev, "unable to read 'value' and 'mask'");
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return -EINVAL;
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}
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if (value_err) {
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/* support old binding */
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value = mask;
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mask = 0xFFFFFFFF;
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} else if (mask_err) {
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/* support value without mask*/
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mask = 0xFFFFFFFF;
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}
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if (pm_power_off) {
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dev_err(&pdev->dev, "pm_power_off already claimed for %ps",
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pm_power_off);
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return -EBUSY;
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}
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pm_power_off = syscon_poweroff;
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return 0;
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}
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static int syscon_poweroff_remove(struct platform_device *pdev)
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{
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if (pm_power_off == syscon_poweroff)
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pm_power_off = NULL;
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return 0;
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}
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static const struct of_device_id syscon_poweroff_of_match[] = {
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{ .compatible = "syscon-poweroff" },
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{}
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};
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static struct platform_driver syscon_poweroff_driver = {
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.probe = syscon_poweroff_probe,
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.remove = syscon_poweroff_remove,
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.driver = {
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.name = "syscon-poweroff",
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.of_match_table = syscon_poweroff_of_match,
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},
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};
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static int __init syscon_poweroff_register(void)
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{
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return platform_driver_register(&syscon_poweroff_driver);
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}
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device_initcall(syscon_poweroff_register);
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