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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* OLPC XO-1.5 ebook switch driver
* (based on generic ACPI button driver)
*
* Copyright (C) 2009 Paul Fox <pgf@laptop.org>
* Copyright (C) 2010 One Laptop per Child
*/
#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/input.h>
#include <linux/acpi.h>
#include <linux/platform_device.h>
#define MODULE_NAME "xo15-ebook"
#define XO15_EBOOK_TYPE_UNKNOWN 0x00
#define XO15_EBOOK_NOTIFY_STATUS 0x80
#define XO15_EBOOK_HID "XO15EBK"
MODULE_DESCRIPTION("OLPC XO-1.5 ebook switch driver");
MODULE_LICENSE("GPL");
static const struct acpi_device_id ebook_device_ids[] = {
{ XO15_EBOOK_HID, 0 },
{ "", 0 },
};
MODULE_DEVICE_TABLE(acpi, ebook_device_ids);
struct ebook_switch {
struct input_dev *input;
char phys[32]; /* for input device */
bool gpe_enabled;
};
static int ebook_send_state(struct device *dev)
{
struct ebook_switch *button = dev_get_drvdata(dev);
unsigned long long state;
acpi_status status;
status = acpi_evaluate_integer(ACPI_HANDLE(dev), "EBK", NULL, &state);
if (ACPI_FAILURE(status))
return -EIO;
/* input layer checks if event is redundant */
input_report_switch(button->input, SW_TABLET_MODE, !state);
input_sync(button->input);
return 0;
}
static void ebook_switch_notify(acpi_handle handle, u32 event, void *data)
{
switch (event) {
case ACPI_FIXED_HARDWARE_EVENT:
case XO15_EBOOK_NOTIFY_STATUS:
ebook_send_state(data);
break;
default:
acpi_handle_debug(handle, "Unsupported event [0x%x]\n", event);
break;
}
}
#ifdef CONFIG_PM_SLEEP
static int ebook_switch_resume(struct device *dev)
{
return ebook_send_state(dev);
}
#endif
static SIMPLE_DEV_PM_OPS(ebook_switch_pm, NULL, ebook_switch_resume);
static int ebook_switch_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct acpi_device *device = ACPI_COMPANION(dev);
const struct acpi_device_id *id;
struct ebook_switch *button;
struct input_dev *input;
int error;
button = devm_kzalloc(dev, sizeof(*button), GFP_KERNEL);
if (!button)
return -ENOMEM;
platform_set_drvdata(pdev, button);
input = devm_input_allocate_device(dev);
if (!input)
return -ENOMEM;
button->input = input;
id = acpi_match_acpi_device(ebook_device_ids, device);
if (!id)
return dev_err_probe(dev, -ENODEV, "Unsupported hid\n");
snprintf(button->phys, sizeof(button->phys), "%s/button/input0", id->id);
input->name = "EBook Switch";
input->phys = button->phys;
input->id.bustype = BUS_HOST;
input->evbit[0] = BIT_MASK(EV_SW);
set_bit(SW_TABLET_MODE, input->swbit);
error = input_register_device(input);
if (error)
return error;
error = acpi_dev_install_notify_handler(device, ACPI_DEVICE_NOTIFY,
ebook_switch_notify, dev);
if (error)
return error;
ebook_send_state(dev);
if (device->wakeup.flags.valid) {
/* Button's GPE is run-wake GPE */
acpi_enable_gpe(device->wakeup.gpe_device,
device->wakeup.gpe_number);
button->gpe_enabled = true;
}
return 0;
}
static void ebook_switch_remove(struct platform_device *pdev)
{
struct ebook_switch *button = platform_get_drvdata(pdev);
struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
if (button->gpe_enabled)
acpi_disable_gpe(device->wakeup.gpe_device,
device->wakeup.gpe_number);
acpi_dev_remove_notify_handler(device, ACPI_DEVICE_NOTIFY,
ebook_switch_notify);
}
static struct platform_driver xo15_ebook_driver = {
.probe = ebook_switch_probe,
.remove = ebook_switch_remove,
.driver = {
.name = MODULE_NAME,
.acpi_match_table = ebook_device_ids,
.pm = &ebook_switch_pm,
},
};
module_platform_driver(xo15_ebook_driver);
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