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power: reset: Add TPS65086 restart driver
Signed-off-by: Emil Renner Berthing <kernel@esmil.dk>
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// SPDX-License-Identifier: GPL-2.0 | ||
/* | ||
* Copyright (C) 2021 Emil Renner Berthing | ||
*/ | ||
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#include <linux/reboot.h> | ||
#include <linux/mod_devicetable.h> | ||
#include <linux/module.h> | ||
#include <linux/platform_device.h> | ||
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#include <linux/mfd/tps65086.h> | ||
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struct tps65086_restart { | ||
struct notifier_block handler; | ||
struct tps65086 *tps; | ||
struct device *dev; | ||
}; | ||
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static int tps65086_restart_notify(struct notifier_block *this, | ||
unsigned long mode, void *cmd) | ||
{ | ||
struct tps65086_restart *tps65086_restart = | ||
container_of(this, struct tps65086_restart, handler); | ||
int ret; | ||
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ret = regmap_write(tps65086_restart->tps->regmap, TPS65086_FORCESHUTDN, 1); | ||
if (ret) { | ||
dev_err(tps65086_restart->dev, "%s: error writing to tps65086 pmic: %d\n", | ||
__func__, ret); | ||
return NOTIFY_DONE; | ||
} | ||
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/* give it a little time */ | ||
mdelay(200); | ||
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WARN_ON(1); | ||
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return NOTIFY_DONE; | ||
} | ||
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static int tps65086_restart_probe(struct platform_device *pdev) | ||
{ | ||
struct tps65086_restart *tps65086_restart; | ||
int ret; | ||
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tps65086_restart = devm_kzalloc(&pdev->dev, sizeof(*tps65086_restart), GFP_KERNEL); | ||
if (!tps65086_restart) | ||
return -ENOMEM; | ||
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platform_set_drvdata(pdev, tps65086_restart); | ||
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tps65086_restart->handler.notifier_call = tps65086_restart_notify; | ||
tps65086_restart->handler.priority = 192; | ||
tps65086_restart->tps = dev_get_drvdata(pdev->dev.parent); | ||
tps65086_restart->dev = &pdev->dev; | ||
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ret = register_restart_handler(&tps65086_restart->handler); | ||
if (ret) { | ||
dev_err(&pdev->dev, "%s: cannot register restart handler: %d\n", | ||
__func__, ret); | ||
return -ENODEV; | ||
} | ||
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return 0; | ||
} | ||
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static int tps65086_restart_remove(struct platform_device *pdev) | ||
{ | ||
struct tps65086_restart *tps65086_restart = platform_get_drvdata(pdev); | ||
int ret; | ||
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ret = unregister_restart_handler(&tps65086_restart->handler); | ||
if (ret) { | ||
dev_err(&pdev->dev, | ||
"%s: cannot unregister restart handler: %d\n", | ||
__func__, ret); | ||
return -ENODEV; | ||
} | ||
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return 0; | ||
} | ||
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static const struct platform_device_id tps65086_restart_id_table[] = { | ||
{ "tps65086-restart", }, | ||
{ /* sentinel */ } | ||
}; | ||
MODULE_DEVICE_TABLE(platform, tps65086_restart_id_table); | ||
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static struct platform_driver tps65086_restart_driver = { | ||
.driver = { | ||
.name = "tps65086-restart", | ||
}, | ||
.probe = tps65086_restart_probe, | ||
.remove = tps65086_restart_remove, | ||
.id_table = tps65086_restart_id_table, | ||
}; | ||
module_platform_driver(tps65086_restart_driver); | ||
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MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>"); | ||
MODULE_DESCRIPTION("TPS65086 restart driver"); | ||
MODULE_LICENSE("GPL v2"); |