OLPC XO-1.5 ebook switch driver

The OLPC XO-1.5 has an ebook switch, triggered when the laptop
screen is rotated then folding down, converting the device into ebook
form.

This switch is exposed through ACPI. Add a driver that exposes it
to userspace as an input device.

Signed-off-by: Daniel Drake <dsd@laptop.org>
Acked-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Matthew Garrett <mjg@redhat.com>

3 files changed, 191 insertions, 0 deletions

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 222dfb737b11..2f6a37a1d2e6 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -672,4 +672,13 @@ config XO1_RFKILL
           Support for enabling/disabling the WLAN interface on the OLPC XO-1
           laptop.
 
+config XO15_EBOOK
+        tristate "OLPC XO-1.5 ebook switch"
+        depends on ACPI && INPUT
+        ---help---
+          Support for the ebook switch on the OLPC XO-1.5 laptop.
+
+          This switch is triggered as the screen is rotated and folded down to
+          convert the device into ebook form.
+
 endif # X86_PLATFORM_DEVICES
diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
index 299aefb3e74c..daa286c9d53a 100644
--- a/drivers/platform/x86/Makefile
+++ b/drivers/platform/x86/Makefile
@@ -34,4 +34,5 @@ obj-$(CONFIG_RAR_REGISTER)	+= intel_rar_register.o
 obj-$(CONFIG_INTEL_IPS)         += intel_ips.o
 obj-$(CONFIG_GPIO_INTEL_PMIC)   += intel_pmic_gpio.o
 obj-$(CONFIG_XO1_RFKILL)        += xo1-rfkill.o
+obj-$(CONFIG_XO15_EBOOK)        += xo15-ebook.o
 obj-$(CONFIG_IBM_RTL)           += ibm_rtl.o
diff --git a/drivers/platform/x86/xo15-ebook.c b/drivers/platform/x86/xo15-ebook.c
new file mode 100644
index 000000000000..2343bb36e563
--- /dev/null
+++ b/drivers/platform/x86/xo15-ebook.c
@@ -0,0 +1,181 @@
+/*
+ *  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.
+ */
+
+#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 PREFIX MODULE_NAME ": "
+
+#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;
+        }
+}
+
+static int ebook_switch_resume(struct acpi_device *device)
+{
+        return ebook_send_state(device);
+}
+
+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)) {
+                printk(KERN_ERR PREFIX "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->wakeup.run_wake_count++;
+                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,
+                .resume = ebook_switch_resume,
+                .remove = ebook_switch_remove,
+                .notify = ebook_switch_notify,
+        },
+};
+
+static int __init xo15_ebook_init(void)
+{
+        return acpi_bus_register_driver(&xo15_ebook_driver);
+}
+
+static void __exit xo15_ebook_exit(void)
+{
+        acpi_bus_unregister_driver(&xo15_ebook_driver);
+}
+
+module_init(xo15_ebook_init);
+module_exit(xo15_ebook_exit);