| /* |
| * 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 |
| * |
| * 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. |
| */ |
| |
| #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 <acpi/acpi_bus.h> |
| #include <acpi/acpi_drivers.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" |
| |
| ACPI_MODULE_NAME(MODULE_NAME); |
| |
| 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_DEBUG_PRINT((ACPI_DB_INFO, |
| "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, int type) |
| { |
| 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); |