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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/power/reset/tps65086-restart.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/power/reset/tps65086-restart.c')
-rw-r--r-- | drivers/power/reset/tps65086-restart.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/drivers/power/reset/tps65086-restart.c b/drivers/power/reset/tps65086-restart.c new file mode 100644 index 000000000..78b89f745 --- /dev/null +++ b/drivers/power/reset/tps65086-restart.c @@ -0,0 +1,98 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2021 Emil Renner Berthing + */ + +#include <linux/mfd/tps65086.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/reboot.h> + +struct tps65086_restart { + struct notifier_block handler; + struct device *dev; +}; + +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); + struct tps65086 *tps65086 = dev_get_drvdata(tps65086_restart->dev->parent); + int ret; + + ret = regmap_write(tps65086->regmap, TPS65086_FORCESHUTDN, 1); + if (ret) { + dev_err(tps65086_restart->dev, "%s: error writing to tps65086 pmic: %d\n", + __func__, ret); + return NOTIFY_DONE; + } + + /* give it a little time */ + mdelay(200); + + WARN_ON(1); + + return NOTIFY_DONE; +} + +static int tps65086_restart_probe(struct platform_device *pdev) +{ + struct tps65086_restart *tps65086_restart; + int ret; + + tps65086_restart = devm_kzalloc(&pdev->dev, sizeof(*tps65086_restart), GFP_KERNEL); + if (!tps65086_restart) + return -ENOMEM; + + platform_set_drvdata(pdev, tps65086_restart); + + tps65086_restart->handler.notifier_call = tps65086_restart_notify; + tps65086_restart->handler.priority = 192; + tps65086_restart->dev = &pdev->dev; + + ret = register_restart_handler(&tps65086_restart->handler); + if (ret) { + dev_err(&pdev->dev, "%s: cannot register restart handler: %d\n", + __func__, ret); + return -ENODEV; + } + + return 0; +} + +static int tps65086_restart_remove(struct platform_device *pdev) +{ + struct tps65086_restart *tps65086_restart = platform_get_drvdata(pdev); + int ret; + + ret = unregister_restart_handler(&tps65086_restart->handler); + if (ret) { + dev_err(&pdev->dev, "%s: cannot unregister restart handler: %d\n", + __func__, ret); + return -ENODEV; + } + + return 0; +} + +static const struct platform_device_id tps65086_restart_id_table[] = { + { "tps65086-reset", }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(platform, tps65086_restart_id_table); + +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); + +MODULE_AUTHOR("Emil Renner Berthing <kernel@esmil.dk>"); +MODULE_DESCRIPTION("TPS65086 restart driver"); +MODULE_LICENSE("GPL v2"); |