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>

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 222dfb7..2f6a37a 100644 (file)
--- 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 299aefb..daa286c 100644 (file)
--- 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 (file)
index 0000000..2343bb3
--- /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);