1*2874c5fdSThomas 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 ACPI_MODULE_NAME(MODULE_NAME); 3089ca1177SPaul Fox 3189ca1177SPaul Fox MODULE_DESCRIPTION("OLPC XO-1.5 ebook switch driver"); 3289ca1177SPaul Fox MODULE_LICENSE("GPL"); 3389ca1177SPaul Fox 3489ca1177SPaul Fox static const struct acpi_device_id ebook_device_ids[] = { 3589ca1177SPaul Fox { XO15_EBOOK_HID, 0 }, 3689ca1177SPaul Fox { "", 0 }, 3789ca1177SPaul Fox }; 3889ca1177SPaul Fox MODULE_DEVICE_TABLE(acpi, ebook_device_ids); 3989ca1177SPaul Fox 4089ca1177SPaul Fox struct ebook_switch { 4189ca1177SPaul Fox struct input_dev *input; 4289ca1177SPaul Fox char phys[32]; /* for input device */ 4389ca1177SPaul Fox }; 4489ca1177SPaul Fox 4589ca1177SPaul Fox static int ebook_send_state(struct acpi_device *device) 4689ca1177SPaul Fox { 4789ca1177SPaul Fox struct ebook_switch *button = acpi_driver_data(device); 4889ca1177SPaul Fox unsigned long long state; 4989ca1177SPaul Fox acpi_status status; 5089ca1177SPaul Fox 5189ca1177SPaul Fox status = acpi_evaluate_integer(device->handle, "EBK", NULL, &state); 5289ca1177SPaul Fox if (ACPI_FAILURE(status)) 5389ca1177SPaul Fox return -EIO; 5489ca1177SPaul Fox 5589ca1177SPaul Fox /* input layer checks if event is redundant */ 5689ca1177SPaul Fox input_report_switch(button->input, SW_TABLET_MODE, !state); 5789ca1177SPaul Fox input_sync(button->input); 5889ca1177SPaul Fox return 0; 5989ca1177SPaul Fox } 6089ca1177SPaul Fox 6189ca1177SPaul Fox static void ebook_switch_notify(struct acpi_device *device, u32 event) 6289ca1177SPaul Fox { 6389ca1177SPaul Fox switch (event) { 6489ca1177SPaul Fox case ACPI_FIXED_HARDWARE_EVENT: 6589ca1177SPaul Fox case XO15_EBOOK_NOTIFY_STATUS: 6689ca1177SPaul Fox ebook_send_state(device); 6789ca1177SPaul Fox break; 6889ca1177SPaul Fox default: 6989ca1177SPaul Fox ACPI_DEBUG_PRINT((ACPI_DB_INFO, 7089ca1177SPaul Fox "Unsupported event [0x%x]\n", event)); 7189ca1177SPaul Fox break; 7289ca1177SPaul Fox } 7389ca1177SPaul Fox } 7489ca1177SPaul Fox 753567a4e2SRafael J. Wysocki #ifdef CONFIG_PM_SLEEP 7644cb98c4SRafael J. Wysocki static int ebook_switch_resume(struct device *dev) 7789ca1177SPaul Fox { 7844cb98c4SRafael J. Wysocki return ebook_send_state(to_acpi_device(dev)); 7989ca1177SPaul Fox } 803567a4e2SRafael J. Wysocki #endif 8189ca1177SPaul Fox 8244cb98c4SRafael J. Wysocki static SIMPLE_DEV_PM_OPS(ebook_switch_pm, NULL, ebook_switch_resume); 8344cb98c4SRafael J. Wysocki 8489ca1177SPaul Fox static int ebook_switch_add(struct acpi_device *device) 8589ca1177SPaul Fox { 8689ca1177SPaul Fox struct ebook_switch *button; 8789ca1177SPaul Fox struct input_dev *input; 8889ca1177SPaul Fox const char *hid = acpi_device_hid(device); 8989ca1177SPaul Fox char *name, *class; 9089ca1177SPaul Fox int error; 9189ca1177SPaul Fox 9289ca1177SPaul Fox button = kzalloc(sizeof(struct ebook_switch), GFP_KERNEL); 9389ca1177SPaul Fox if (!button) 9489ca1177SPaul Fox return -ENOMEM; 9589ca1177SPaul Fox 9689ca1177SPaul Fox device->driver_data = button; 9789ca1177SPaul Fox 9889ca1177SPaul Fox button->input = input = input_allocate_device(); 9989ca1177SPaul Fox if (!input) { 10089ca1177SPaul Fox error = -ENOMEM; 10189ca1177SPaul Fox goto err_free_button; 10289ca1177SPaul Fox } 10389ca1177SPaul Fox 10489ca1177SPaul Fox name = acpi_device_name(device); 10589ca1177SPaul Fox class = acpi_device_class(device); 10689ca1177SPaul Fox 10789ca1177SPaul Fox if (strcmp(hid, XO15_EBOOK_HID)) { 108ad3f2f03SJoe Perches pr_err("Unsupported hid [%s]\n", hid); 10989ca1177SPaul Fox error = -ENODEV; 11089ca1177SPaul Fox goto err_free_input; 11189ca1177SPaul Fox } 11289ca1177SPaul Fox 11389ca1177SPaul Fox strcpy(name, XO15_EBOOK_DEVICE_NAME); 11489ca1177SPaul Fox sprintf(class, "%s/%s", XO15_EBOOK_CLASS, XO15_EBOOK_SUBCLASS); 11589ca1177SPaul Fox 11689ca1177SPaul Fox snprintf(button->phys, sizeof(button->phys), "%s/button/input0", hid); 11789ca1177SPaul Fox 11889ca1177SPaul Fox input->name = name; 11989ca1177SPaul Fox input->phys = button->phys; 12089ca1177SPaul Fox input->id.bustype = BUS_HOST; 12189ca1177SPaul Fox input->dev.parent = &device->dev; 12289ca1177SPaul Fox 12389ca1177SPaul Fox input->evbit[0] = BIT_MASK(EV_SW); 12489ca1177SPaul Fox set_bit(SW_TABLET_MODE, input->swbit); 12589ca1177SPaul Fox 12689ca1177SPaul Fox error = input_register_device(input); 12789ca1177SPaul Fox if (error) 12889ca1177SPaul Fox goto err_free_input; 12989ca1177SPaul Fox 13089ca1177SPaul Fox ebook_send_state(device); 13189ca1177SPaul Fox 13289ca1177SPaul Fox if (device->wakeup.flags.valid) { 13389ca1177SPaul Fox /* Button's GPE is run-wake GPE */ 13489ca1177SPaul Fox acpi_enable_gpe(device->wakeup.gpe_device, 13589ca1177SPaul Fox device->wakeup.gpe_number); 13689ca1177SPaul Fox device_set_wakeup_enable(&device->dev, true); 13789ca1177SPaul Fox } 13889ca1177SPaul Fox 13989ca1177SPaul Fox return 0; 14089ca1177SPaul Fox 14189ca1177SPaul Fox err_free_input: 14289ca1177SPaul Fox input_free_device(input); 14389ca1177SPaul Fox err_free_button: 14489ca1177SPaul Fox kfree(button); 14589ca1177SPaul Fox return error; 14689ca1177SPaul Fox } 14789ca1177SPaul Fox 14851fac838SRafael J. Wysocki static int ebook_switch_remove(struct acpi_device *device) 14989ca1177SPaul Fox { 15089ca1177SPaul Fox struct ebook_switch *button = acpi_driver_data(device); 15189ca1177SPaul Fox 15289ca1177SPaul Fox input_unregister_device(button->input); 15389ca1177SPaul Fox kfree(button); 15489ca1177SPaul Fox return 0; 15589ca1177SPaul Fox } 15689ca1177SPaul Fox 15789ca1177SPaul Fox static struct acpi_driver xo15_ebook_driver = { 15889ca1177SPaul Fox .name = MODULE_NAME, 15989ca1177SPaul Fox .class = XO15_EBOOK_CLASS, 16089ca1177SPaul Fox .ids = ebook_device_ids, 16189ca1177SPaul Fox .ops = { 16289ca1177SPaul Fox .add = ebook_switch_add, 16389ca1177SPaul Fox .remove = ebook_switch_remove, 16489ca1177SPaul Fox .notify = ebook_switch_notify, 16589ca1177SPaul Fox }, 16644cb98c4SRafael J. Wysocki .drv.pm = &ebook_switch_pm, 16789ca1177SPaul Fox }; 168a509d228SMika Westerberg module_acpi_driver(xo15_ebook_driver); 169