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168 lines
3.8 KiB
168 lines
3.8 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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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 <[email protected]> |
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* Copyright (C) 2010 One Laptop per Child |
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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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