173 lines
4 KiB
C
173 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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