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![Lv Zheng](/assets/img/avatar_default.png)
Replace direct inclusions of <acpi/acpi.h>, <acpi/acpi_bus.h> and <acpi/acpi_drivers.h>, which are incorrect, with <linux/acpi.h> inclusions and remove some inclusions of those files that aren't necessary. First of all, <acpi/acpi.h>, <acpi/acpi_bus.h> and <acpi/acpi_drivers.h> should not be included directly from any files that are built for CONFIG_ACPI unset, because that generally leads to build warnings about undefined symbols in !CONFIG_ACPI builds. For CONFIG_ACPI set, <linux/acpi.h> includes those files and for CONFIG_ACPI unset it provides stub ACPI symbols to be used in that case. Second, there are ordering dependencies between those files that always have to be met. Namely, it is required that <acpi/acpi_bus.h> be included prior to <acpi/acpi_drivers.h> so that the acpi_pci_root declarations the latter depends on are always there. And <acpi/acpi.h> which provides basic ACPICA type declarations should always be included prior to any other ACPI headers in CONFIG_ACPI builds. That also is taken care of including <linux/acpi.h> as appropriate. Signed-off-by: Lv Zheng <lv.zheng@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Matthew Garrett <mjg59@srcf.ucam.org> Cc: Tony Luck <tony.luck@intel.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Acked-by: Bjorn Helgaas <bhelgaas@google.com> (drivers/pci stuff) Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> (Xen stuff) Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
172 lines
4 KiB
C
172 lines
4 KiB
C
/*
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* OLPC XO-1.5 ebook switch driver
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* (based on generic ACPI button driver)
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*
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* Copyright (C) 2009 Paul Fox <pgf@laptop.org>
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* Copyright (C) 2010 One Laptop per Child
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/input.h>
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#include <linux/acpi.h>
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#define MODULE_NAME "xo15-ebook"
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#define XO15_EBOOK_CLASS MODULE_NAME
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#define XO15_EBOOK_TYPE_UNKNOWN 0x00
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#define XO15_EBOOK_NOTIFY_STATUS 0x80
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#define XO15_EBOOK_SUBCLASS "ebook"
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#define XO15_EBOOK_HID "XO15EBK"
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#define XO15_EBOOK_DEVICE_NAME "EBook Switch"
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ACPI_MODULE_NAME(MODULE_NAME);
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MODULE_DESCRIPTION("OLPC XO-1.5 ebook switch driver");
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MODULE_LICENSE("GPL");
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static const struct acpi_device_id ebook_device_ids[] = {
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{ XO15_EBOOK_HID, 0 },
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{ "", 0 },
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};
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MODULE_DEVICE_TABLE(acpi, ebook_device_ids);
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struct ebook_switch {
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struct input_dev *input;
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char phys[32]; /* for input device */
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};
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static int ebook_send_state(struct acpi_device *device)
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{
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struct ebook_switch *button = acpi_driver_data(device);
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unsigned long long state;
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acpi_status status;
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status = acpi_evaluate_integer(device->handle, "EBK", NULL, &state);
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if (ACPI_FAILURE(status))
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return -EIO;
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/* input layer checks if event is redundant */
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input_report_switch(button->input, SW_TABLET_MODE, !state);
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input_sync(button->input);
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return 0;
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}
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static void ebook_switch_notify(struct acpi_device *device, u32 event)
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{
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switch (event) {
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case ACPI_FIXED_HARDWARE_EVENT:
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case XO15_EBOOK_NOTIFY_STATUS:
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ebook_send_state(device);
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break;
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default:
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Unsupported event [0x%x]\n", event));
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break;
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}
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}
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#ifdef CONFIG_PM_SLEEP
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static int ebook_switch_resume(struct device *dev)
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{
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return ebook_send_state(to_acpi_device(dev));
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}
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#endif
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static SIMPLE_DEV_PM_OPS(ebook_switch_pm, NULL, ebook_switch_resume);
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static int ebook_switch_add(struct acpi_device *device)
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{
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struct ebook_switch *button;
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struct input_dev *input;
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const char *hid = acpi_device_hid(device);
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char *name, *class;
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int error;
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button = kzalloc(sizeof(struct ebook_switch), GFP_KERNEL);
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if (!button)
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return -ENOMEM;
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device->driver_data = button;
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button->input = input = input_allocate_device();
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if (!input) {
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error = -ENOMEM;
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goto err_free_button;
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}
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name = acpi_device_name(device);
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class = acpi_device_class(device);
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if (strcmp(hid, XO15_EBOOK_HID)) {
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pr_err("Unsupported hid [%s]\n", hid);
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error = -ENODEV;
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goto err_free_input;
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}
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strcpy(name, XO15_EBOOK_DEVICE_NAME);
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sprintf(class, "%s/%s", XO15_EBOOK_CLASS, XO15_EBOOK_SUBCLASS);
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snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid);
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input->name = name;
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input->phys = button->phys;
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input->id.bustype = BUS_HOST;
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input->dev.parent = &device->dev;
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input->evbit[0] = BIT_MASK(EV_SW);
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set_bit(SW_TABLET_MODE, input->swbit);
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error = input_register_device(input);
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if (error)
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goto err_free_input;
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ebook_send_state(device);
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if (device->wakeup.flags.valid) {
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/* Button's GPE is run-wake GPE */
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acpi_enable_gpe(device->wakeup.gpe_device,
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device->wakeup.gpe_number);
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device_set_wakeup_enable(&device->dev, true);
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}
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return 0;
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err_free_input:
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input_free_device(input);
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err_free_button:
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kfree(button);
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return error;
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}
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static int ebook_switch_remove(struct acpi_device *device)
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{
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struct ebook_switch *button = acpi_driver_data(device);
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input_unregister_device(button->input);
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kfree(button);
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return 0;
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}
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static struct acpi_driver xo15_ebook_driver = {
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.name = MODULE_NAME,
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.class = XO15_EBOOK_CLASS,
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.ids = ebook_device_ids,
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.ops = {
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.add = ebook_switch_add,
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.remove = ebook_switch_remove,
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.notify = ebook_switch_notify,
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},
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.drv.pm = &ebook_switch_pm,
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};
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module_acpi_driver(xo15_ebook_driver);
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