linux/drivers/platform/x86/toshiba_haps.c

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 157 Based on 3 normalized pattern(s): 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 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 [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] 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 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 [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-27 14:55:06 +08:00
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Toshiba HDD Active Protection Sensor (HAPS) driver
*
* Copyright (C) 2014 Azael Avalos <coproscefalo@gmail.com>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/acpi.h>
MODULE_AUTHOR("Azael Avalos <coproscefalo@gmail.com>");
MODULE_DESCRIPTION("Toshiba HDD Active Protection Sensor");
MODULE_LICENSE("GPL");
struct toshiba_haps_dev {
struct acpi_device *acpi_dev;
int protection_level;
};
static struct toshiba_haps_dev *toshiba_haps;
/* HAPS functions */
static int toshiba_haps_reset_protection(acpi_handle handle)
{
acpi_status status;
status = acpi_evaluate_object(handle, "RSSS", NULL, NULL);
if (ACPI_FAILURE(status)) {
pr_err("Unable to reset the HDD protection\n");
return -EIO;
}
return 0;
}
static int toshiba_haps_protection_level(acpi_handle handle, int level)
{
acpi_status status;
status = acpi_execute_simple_method(handle, "PTLV", level);
if (ACPI_FAILURE(status)) {
pr_err("Error while setting the protection level\n");
return -EIO;
}
pr_debug("HDD protection level set to: %d\n", level);
return 0;
}
/* sysfs files */
static ssize_t protection_level_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct toshiba_haps_dev *haps = dev_get_drvdata(dev);
return sprintf(buf, "%i\n", haps->protection_level);
}
static ssize_t protection_level_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct toshiba_haps_dev *haps = dev_get_drvdata(dev);
int level;
int ret;
ret = kstrtoint(buf, 0, &level);
if (ret)
return ret;
/*
* Check for supported levels, which can be:
* 0 - Disabled | 1 - Low | 2 - Medium | 3 - High
*/
if (level < 0 || level > 3)
return -EINVAL;
/* Set the sensor level */
ret = toshiba_haps_protection_level(haps->acpi_dev->handle, level);
if (ret != 0)
return ret;
haps->protection_level = level;
return count;
}
static DEVICE_ATTR_RW(protection_level);
static ssize_t reset_protection_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct toshiba_haps_dev *haps = dev_get_drvdata(dev);
int reset;
int ret;
ret = kstrtoint(buf, 0, &reset);
if (ret)
return ret;
/* The only accepted value is 1 */
if (reset != 1)
return -EINVAL;
/* Reset the protection interface */
ret = toshiba_haps_reset_protection(haps->acpi_dev->handle);
if (ret != 0)
return ret;
return count;
}
static DEVICE_ATTR_WO(reset_protection);
static struct attribute *haps_attributes[] = {
&dev_attr_protection_level.attr,
&dev_attr_reset_protection.attr,
NULL,
};
static const struct attribute_group haps_attr_group = {
.attrs = haps_attributes,
};
/*
* ACPI stuff
*/
static void toshiba_haps_notify(struct acpi_device *device, u32 event)
{
pr_debug("Received event: 0x%x", event);
acpi_bus_generate_netlink_event(device->pnp.device_class,
dev_name(&device->dev),
event, 0);
}
static int toshiba_haps_remove(struct acpi_device *device)
{
sysfs_remove_group(&device->dev.kobj, &haps_attr_group);
if (toshiba_haps)
toshiba_haps = NULL;
return 0;
}
/* Helper function */
static int toshiba_haps_available(acpi_handle handle)
{
acpi_status status;
u64 hdd_present;
/*
* A non existent device as well as having (only)
* Solid State Drives can cause the call to fail.
*/
status = acpi_evaluate_integer(handle, "_STA", NULL, &hdd_present);
if (ACPI_FAILURE(status)) {
pr_err("ACPI call to query HDD protection failed\n");
return 0;
}
if (!hdd_present) {
pr_info("HDD protection not available or using SSD\n");
return 0;
}
return 1;
}
static int toshiba_haps_add(struct acpi_device *acpi_dev)
{
struct toshiba_haps_dev *haps;
int ret;
if (toshiba_haps)
return -EBUSY;
if (!toshiba_haps_available(acpi_dev->handle))
return -ENODEV;
pr_info("Toshiba HDD Active Protection Sensor device\n");
haps = kzalloc(sizeof(struct toshiba_haps_dev), GFP_KERNEL);
if (!haps)
return -ENOMEM;
haps->acpi_dev = acpi_dev;
haps->protection_level = 2;
acpi_dev->driver_data = haps;
dev_set_drvdata(&acpi_dev->dev, haps);
/* Set the protection level, currently at level 2 (Medium) */
ret = toshiba_haps_protection_level(acpi_dev->handle, 2);
if (ret != 0)
return ret;
ret = sysfs_create_group(&acpi_dev->dev.kobj, &haps_attr_group);
if (ret)
return ret;
toshiba_haps = haps;
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int toshiba_haps_suspend(struct device *device)
{
struct toshiba_haps_dev *haps;
int ret;
haps = acpi_driver_data(to_acpi_device(device));
/* Deactivate the protection on suspend */
ret = toshiba_haps_protection_level(haps->acpi_dev->handle, 0);
return ret;
}
static int toshiba_haps_resume(struct device *device)
{
struct toshiba_haps_dev *haps;
int ret;
haps = acpi_driver_data(to_acpi_device(device));
/* Set the stored protection level */
ret = toshiba_haps_protection_level(haps->acpi_dev->handle,
haps->protection_level);
/* Reset the protection on resume */
ret = toshiba_haps_reset_protection(haps->acpi_dev->handle);
if (ret != 0)
return ret;
return ret;
}
#endif
static SIMPLE_DEV_PM_OPS(toshiba_haps_pm,
toshiba_haps_suspend, toshiba_haps_resume);
static const struct acpi_device_id haps_device_ids[] = {
{"TOS620A", 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, haps_device_ids);
static struct acpi_driver toshiba_haps_driver = {
.name = "Toshiba HAPS",
.owner = THIS_MODULE,
.ids = haps_device_ids,
.flags = ACPI_DRIVER_ALL_NOTIFY_EVENTS,
.ops = {
.add = toshiba_haps_add,
.remove = toshiba_haps_remove,
.notify = toshiba_haps_notify,
},
.drv.pm = &toshiba_haps_pm,
};
module_acpi_driver(toshiba_haps_driver);