167 lines
3.7 KiB
C
167 lines
3.7 KiB
C
// 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>
|
|
|
|
#define MODULE_NAME "xo15-ebook"
|
|
|
|
#define XO15_EBOOK_CLASS MODULE_NAME
|
|
#define XO15_EBOOK_TYPE_UNKNOWN 0x00
|
|
#define XO15_EBOOK_NOTIFY_STATUS 0x80
|
|
|
|
#define XO15_EBOOK_SUBCLASS "ebook"
|
|
#define XO15_EBOOK_HID "XO15EBK"
|
|
#define XO15_EBOOK_DEVICE_NAME "EBook Switch"
|
|
|
|
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 */
|
|
};
|
|
|
|
static int ebook_send_state(struct acpi_device *device)
|
|
{
|
|
struct ebook_switch *button = acpi_driver_data(device);
|
|
unsigned long long state;
|
|
acpi_status status;
|
|
|
|
status = acpi_evaluate_integer(device->handle, "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(struct acpi_device *device, u32 event)
|
|
{
|
|
switch (event) {
|
|
case ACPI_FIXED_HARDWARE_EVENT:
|
|
case XO15_EBOOK_NOTIFY_STATUS:
|
|
ebook_send_state(device);
|
|
break;
|
|
default:
|
|
acpi_handle_debug(device->handle,
|
|
"Unsupported event [0x%x]\n", event);
|
|
break;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int ebook_switch_resume(struct device *dev)
|
|
{
|
|
return ebook_send_state(to_acpi_device(dev));
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(ebook_switch_pm, NULL, ebook_switch_resume);
|
|
|
|
static int ebook_switch_add(struct acpi_device *device)
|
|
{
|
|
struct ebook_switch *button;
|
|
struct input_dev *input;
|
|
const char *hid = acpi_device_hid(device);
|
|
char *name, *class;
|
|
int error;
|
|
|
|
button = kzalloc(sizeof(struct ebook_switch), GFP_KERNEL);
|
|
if (!button)
|
|
return -ENOMEM;
|
|
|
|
device->driver_data = button;
|
|
|
|
button->input = input = input_allocate_device();
|
|
if (!input) {
|
|
error = -ENOMEM;
|
|
goto err_free_button;
|
|
}
|
|
|
|
name = acpi_device_name(device);
|
|
class = acpi_device_class(device);
|
|
|
|
if (strcmp(hid, XO15_EBOOK_HID)) {
|
|
pr_err("Unsupported hid [%s]\n", hid);
|
|
error = -ENODEV;
|
|
goto err_free_input;
|
|
}
|
|
|
|
strcpy(name, XO15_EBOOK_DEVICE_NAME);
|
|
sprintf(class, "%s/%s", XO15_EBOOK_CLASS, XO15_EBOOK_SUBCLASS);
|
|
|
|
snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
|
|
|
|
input->name = name;
|
|
input->phys = button->phys;
|
|
input->id.bustype = BUS_HOST;
|
|
input->dev.parent = &device->dev;
|
|
|
|
input->evbit[0] = BIT_MASK(EV_SW);
|
|
set_bit(SW_TABLET_MODE, input->swbit);
|
|
|
|
error = input_register_device(input);
|
|
if (error)
|
|
goto err_free_input;
|
|
|
|
ebook_send_state(device);
|
|
|
|
if (device->wakeup.flags.valid) {
|
|
/* Button's GPE is run-wake GPE */
|
|
acpi_enable_gpe(device->wakeup.gpe_device,
|
|
device->wakeup.gpe_number);
|
|
device_set_wakeup_enable(&device->dev, true);
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_free_input:
|
|
input_free_device(input);
|
|
err_free_button:
|
|
kfree(button);
|
|
return error;
|
|
}
|
|
|
|
static int ebook_switch_remove(struct acpi_device *device)
|
|
{
|
|
struct ebook_switch *button = acpi_driver_data(device);
|
|
|
|
input_unregister_device(button->input);
|
|
kfree(button);
|
|
return 0;
|
|
}
|
|
|
|
static struct acpi_driver xo15_ebook_driver = {
|
|
.name = MODULE_NAME,
|
|
.class = XO15_EBOOK_CLASS,
|
|
.ids = ebook_device_ids,
|
|
.ops = {
|
|
.add = ebook_switch_add,
|
|
.remove = ebook_switch_remove,
|
|
.notify = ebook_switch_notify,
|
|
},
|
|
.drv.pm = &ebook_switch_pm,
|
|
};
|
|
module_acpi_driver(xo15_ebook_driver);
|