12874c5fdSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later
289ca1177SPaul Fox /*
389ca1177SPaul Fox * OLPC XO-1.5 ebook switch driver
489ca1177SPaul Fox * (based on generic ACPI button driver)
589ca1177SPaul Fox *
689ca1177SPaul Fox * Copyright (C) 2009 Paul Fox <pgf@laptop.org>
789ca1177SPaul Fox * Copyright (C) 2010 One Laptop per Child
889ca1177SPaul Fox */
989ca1177SPaul Fox
10ad3f2f03SJoe Perches #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11ad3f2f03SJoe Perches
1289ca1177SPaul Fox #include <linux/kernel.h>
1389ca1177SPaul Fox #include <linux/module.h>
1489ca1177SPaul Fox #include <linux/init.h>
1589ca1177SPaul Fox #include <linux/types.h>
1689ca1177SPaul Fox #include <linux/input.h>
178b48463fSLv Zheng #include <linux/acpi.h>
1889ca1177SPaul Fox
1989ca1177SPaul Fox #define MODULE_NAME "xo15-ebook"
2089ca1177SPaul Fox
2189ca1177SPaul Fox #define XO15_EBOOK_CLASS MODULE_NAME
2289ca1177SPaul Fox #define XO15_EBOOK_TYPE_UNKNOWN 0x00
2389ca1177SPaul Fox #define XO15_EBOOK_NOTIFY_STATUS 0x80
2489ca1177SPaul Fox
2589ca1177SPaul Fox #define XO15_EBOOK_SUBCLASS "ebook"
2689ca1177SPaul Fox #define XO15_EBOOK_HID "XO15EBK"
2789ca1177SPaul Fox #define XO15_EBOOK_DEVICE_NAME "EBook Switch"
2889ca1177SPaul Fox
2989ca1177SPaul Fox MODULE_DESCRIPTION("OLPC XO-1.5 ebook switch driver");
3089ca1177SPaul Fox MODULE_LICENSE("GPL");
3189ca1177SPaul Fox
3289ca1177SPaul Fox static const struct acpi_device_id ebook_device_ids[] = {
3389ca1177SPaul Fox { XO15_EBOOK_HID, 0 },
3489ca1177SPaul Fox { "", 0 },
3589ca1177SPaul Fox };
3689ca1177SPaul Fox MODULE_DEVICE_TABLE(acpi, ebook_device_ids);
3789ca1177SPaul Fox
3889ca1177SPaul Fox struct ebook_switch {
3989ca1177SPaul Fox struct input_dev *input;
4089ca1177SPaul Fox char phys[32]; /* for input device */
4189ca1177SPaul Fox };
4289ca1177SPaul Fox
ebook_send_state(struct acpi_device * device)4389ca1177SPaul Fox static int ebook_send_state(struct acpi_device *device)
4489ca1177SPaul Fox {
4589ca1177SPaul Fox struct ebook_switch *button = acpi_driver_data(device);
4689ca1177SPaul Fox unsigned long long state;
4789ca1177SPaul Fox acpi_status status;
4889ca1177SPaul Fox
4989ca1177SPaul Fox status = acpi_evaluate_integer(device->handle, "EBK", NULL, &state);
5089ca1177SPaul Fox if (ACPI_FAILURE(status))
5189ca1177SPaul Fox return -EIO;
5289ca1177SPaul Fox
5389ca1177SPaul Fox /* input layer checks if event is redundant */
5489ca1177SPaul Fox input_report_switch(button->input, SW_TABLET_MODE, !state);
5589ca1177SPaul Fox input_sync(button->input);
5689ca1177SPaul Fox return 0;
5789ca1177SPaul Fox }
5889ca1177SPaul Fox
ebook_switch_notify(struct acpi_device * device,u32 event)5989ca1177SPaul Fox static void ebook_switch_notify(struct acpi_device *device, u32 event)
6089ca1177SPaul Fox {
6189ca1177SPaul Fox switch (event) {
6289ca1177SPaul Fox case ACPI_FIXED_HARDWARE_EVENT:
6389ca1177SPaul Fox case XO15_EBOOK_NOTIFY_STATUS:
6489ca1177SPaul Fox ebook_send_state(device);
6589ca1177SPaul Fox break;
6689ca1177SPaul Fox default:
6724789075SRafael J. Wysocki acpi_handle_debug(device->handle,
6824789075SRafael J. Wysocki "Unsupported event [0x%x]\n", event);
6989ca1177SPaul Fox break;
7089ca1177SPaul Fox }
7189ca1177SPaul Fox }
7289ca1177SPaul Fox
733567a4e2SRafael J. Wysocki #ifdef CONFIG_PM_SLEEP
ebook_switch_resume(struct device * dev)7444cb98c4SRafael J. Wysocki static int ebook_switch_resume(struct device *dev)
7589ca1177SPaul Fox {
7644cb98c4SRafael J. Wysocki return ebook_send_state(to_acpi_device(dev));
7789ca1177SPaul Fox }
783567a4e2SRafael J. Wysocki #endif
7989ca1177SPaul Fox
8044cb98c4SRafael J. Wysocki static SIMPLE_DEV_PM_OPS(ebook_switch_pm, NULL, ebook_switch_resume);
8144cb98c4SRafael J. Wysocki
ebook_switch_add(struct acpi_device * device)8289ca1177SPaul Fox static int ebook_switch_add(struct acpi_device *device)
8389ca1177SPaul Fox {
84*39789590SAndy Shevchenko const struct acpi_device_id *id;
8589ca1177SPaul Fox struct ebook_switch *button;
8689ca1177SPaul Fox struct input_dev *input;
8789ca1177SPaul Fox char *name, *class;
8889ca1177SPaul Fox int error;
8989ca1177SPaul Fox
9089ca1177SPaul Fox button = kzalloc(sizeof(struct ebook_switch), GFP_KERNEL);
9189ca1177SPaul Fox if (!button)
9289ca1177SPaul Fox return -ENOMEM;
9389ca1177SPaul Fox
9489ca1177SPaul Fox device->driver_data = button;
9589ca1177SPaul Fox
9689ca1177SPaul Fox button->input = input = input_allocate_device();
9789ca1177SPaul Fox if (!input) {
9889ca1177SPaul Fox error = -ENOMEM;
9989ca1177SPaul Fox goto err_free_button;
10089ca1177SPaul Fox }
10189ca1177SPaul Fox
10289ca1177SPaul Fox name = acpi_device_name(device);
10389ca1177SPaul Fox class = acpi_device_class(device);
10489ca1177SPaul Fox
105*39789590SAndy Shevchenko id = acpi_match_acpi_device(ebook_device_ids, device);
106*39789590SAndy Shevchenko if (!id) {
107*39789590SAndy Shevchenko dev_err(&device->dev, "Unsupported hid\n");
10889ca1177SPaul Fox error = -ENODEV;
10989ca1177SPaul Fox goto err_free_input;
11089ca1177SPaul Fox }
11189ca1177SPaul Fox
11289ca1177SPaul Fox strcpy(name, XO15_EBOOK_DEVICE_NAME);
11389ca1177SPaul Fox sprintf(class, "%s/%s", XO15_EBOOK_CLASS, XO15_EBOOK_SUBCLASS);
11489ca1177SPaul Fox
115*39789590SAndy Shevchenko snprintf(button->phys, sizeof(button->phys), "%s/button/input0", id->id);
11689ca1177SPaul Fox
11789ca1177SPaul Fox input->name = name;
11889ca1177SPaul Fox input->phys = button->phys;
11989ca1177SPaul Fox input->id.bustype = BUS_HOST;
12089ca1177SPaul Fox input->dev.parent = &device->dev;
12189ca1177SPaul Fox
12289ca1177SPaul Fox input->evbit[0] = BIT_MASK(EV_SW);
12389ca1177SPaul Fox set_bit(SW_TABLET_MODE, input->swbit);
12489ca1177SPaul Fox
12589ca1177SPaul Fox error = input_register_device(input);
12689ca1177SPaul Fox if (error)
12789ca1177SPaul Fox goto err_free_input;
12889ca1177SPaul Fox
12989ca1177SPaul Fox ebook_send_state(device);
13089ca1177SPaul Fox
13189ca1177SPaul Fox if (device->wakeup.flags.valid) {
13289ca1177SPaul Fox /* Button's GPE is run-wake GPE */
13389ca1177SPaul Fox acpi_enable_gpe(device->wakeup.gpe_device,
13489ca1177SPaul Fox device->wakeup.gpe_number);
13589ca1177SPaul Fox device_set_wakeup_enable(&device->dev, true);
13689ca1177SPaul Fox }
13789ca1177SPaul Fox
13889ca1177SPaul Fox return 0;
13989ca1177SPaul Fox
14089ca1177SPaul Fox err_free_input:
14189ca1177SPaul Fox input_free_device(input);
14289ca1177SPaul Fox err_free_button:
14389ca1177SPaul Fox kfree(button);
14489ca1177SPaul Fox return error;
14589ca1177SPaul Fox }
14689ca1177SPaul Fox
ebook_switch_remove(struct acpi_device * device)1476c0eb5baSDawei Li static void ebook_switch_remove(struct acpi_device *device)
14889ca1177SPaul Fox {
14989ca1177SPaul Fox struct ebook_switch *button = acpi_driver_data(device);
15089ca1177SPaul Fox
15189ca1177SPaul Fox input_unregister_device(button->input);
15289ca1177SPaul Fox kfree(button);
15389ca1177SPaul Fox }
15489ca1177SPaul Fox
15589ca1177SPaul Fox static struct acpi_driver xo15_ebook_driver = {
15689ca1177SPaul Fox .name = MODULE_NAME,
15789ca1177SPaul Fox .class = XO15_EBOOK_CLASS,
15889ca1177SPaul Fox .ids = ebook_device_ids,
15989ca1177SPaul Fox .ops = {
16089ca1177SPaul Fox .add = ebook_switch_add,
16189ca1177SPaul Fox .remove = ebook_switch_remove,
16289ca1177SPaul Fox .notify = ebook_switch_notify,
16389ca1177SPaul Fox },
16444cb98c4SRafael J. Wysocki .drv.pm = &ebook_switch_pm,
16589ca1177SPaul Fox };
166a509d228SMika Westerberg module_acpi_driver(xo15_ebook_driver);
167