Input: add input event to APM event bridge

This patch adds a very simple input power event to APM user suspend
event bridge. Its currently only works for the systems using the
emulated APM driver but could easily be extended to work with anything
with a true APM BIOS too.

This covers a standard embedded system need which is to suspend when the
user presses a suspend button. It leaves options open to system
integrators to ignore (or unload) this code and implement their own more
complex event handling system.

Its hidden behind the EMBEDDED Kconfig option since its only likely to
be of use to embedded style systems. It can be built as a module so the
"hardcoded" policy can easily be removed from the kernel at runtime if
desired too.

Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 131 insertions, 0 deletions

diff --git a/drivers/input/apm-power.c b/drivers/input/apm-power.c
new file mode 100644
index 000000000000..c36d110b349a
--- /dev/null
+++ b/drivers/input/apm-power.c
@@ -0,0 +1,131 @@
+/*
+ *  Input Power Event -> APM Bridge
+ *
+ *  Copyright (c) 2007 Richard Purdie
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 as
+ *  published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/tty.h>
+#include <linux/delay.h>
+#include <linux/pm.h>
+#include <linux/apm-emulation.h>
+
+static void system_power_event(unsigned int keycode)
+{
+        switch (keycode) {
+        case KEY_SUSPEND:
+                apm_queue_event(APM_USER_SUSPEND);
+
+                printk(KERN_INFO "apm-power: Requesting system suspend...\n");
+                break;
+        default:
+                break;
+        }
+}
+
+static void apmpower_event(struct input_handle *handle, unsigned int type,
+                        unsigned int code, int value)
+{
+        /* only react on key down events */
+        if (value != 1)
+                return;
+
+        switch (type) {
+        case EV_PWR:
+                system_power_event(code);
+                break;
+
+        default:
+                break;
+        }
+}
+
+static int apmpower_connect(struct input_handler *handler,
+                                          struct input_dev *dev,
+                                          const struct input_device_id *id)
+{
+        struct input_handle *handle;
+        int error;
+
+        handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
+        if (!handle)
+                return -ENOMEM;
+
+        handle->dev = dev;
+        handle->handler = handler;
+        handle->name = "apm-power";
+
+        handler->private = handle;
+
+        error = input_register_handle(handle);
+        if (error) {
+                printk(KERN_ERR
+                        "apm-power: Failed to register input power handler, "
+                        "error %d\n", error);
+                kfree(handle);
+                return error;
+        }
+
+        error = input_open_device(handle);
+        if (error) {
+                printk(KERN_ERR
+                        "apm-power: Failed to open input power device, "
+                        "error %d\n", error);
+                input_unregister_handle(handle);
+                kfree(handle);
+                return error;
+        }
+
+        return 0;
+}
+
+static void apmpower_disconnect(struct input_handle *handler)
+{
+        struct input_handle *handle = handler->private;
+
+        input_close_device(handle);
+        kfree(handle);
+}
+
+static const struct input_device_id apmpower_ids[] = {
+        {
+                .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
+                .evbit = { BIT_MASK(EV_PWR) },
+        },
+        { },
+};
+
+MODULE_DEVICE_TABLE(input, apmpower_ids);
+
+static struct input_handler apmpower_handler = {
+        .event =        apmpower_event,
+        .connect =      apmpower_connect,
+        .disconnect =   apmpower_disconnect,
+        .name =         "apm-power",
+        .id_table =     apmpower_ids,
+};
+
+static int __init apmpower_init(void)
+{
+        return input_register_handler(&apmpower_handler);
+}
+
+static void __exit apmpower_exit(void)
+{
+        input_unregister_handler(&apmpower_handler);
+}
+
+module_init(apmpower_init);
+module_exit(apmpower_exit);
+
+MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
+MODULE_DESCRIPTION("Input Power Event -> APM Bridge");
+MODULE_LICENSE("GPL");