aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorRichard Purdie <rpurdie@rpsys.net>2008-01-30 16:33:59 -0500
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2008-01-30 16:33:59 -0500
commite17bb1de3b7f7569152c71a51e0bafe5419ab54a (patch)
treef815db1ec495a70fbca536ac4937d25aca4c8c79
parentd182c10c842007984e12b3b816df2b10d997cc8e (diff)
downloadlinux-2.6.34-ux500-e17bb1de3b7f7569152c71a51e0bafe5419ab54a.tar.gz
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>
-rw-r--r--drivers/input/Kconfig12
-rw-r--r--drivers/input/Makefile1
-rw-r--r--drivers/input/apm-power.c131
3 files changed, 144 insertions, 0 deletions
diff --git a/drivers/input/Kconfig b/drivers/input/Kconfig
index 63512d906f0..9dea14db724 100644
--- a/drivers/input/Kconfig
+++ b/drivers/input/Kconfig
@@ -137,6 +137,18 @@ config INPUT_EVBUG
To compile this driver as a module, choose M here: the
module will be called evbug.
+config INPUT_APMPOWER
+ tristate "Input Power Event -> APM Bridge" if EMBEDDED
+ depends on INPUT && APM_EMULATION
+ ---help---
+ Say Y here if you want suspend key events to trigger a user
+ requested suspend through APM. This is useful on embedded
+ systems where such behviour is desired without userspace
+ interaction. If unsure, say N.
+
+ To compile this driver as a module, choose M here: the
+ module will be called apm-power.
+
comment "Input Device Drivers"
source "drivers/input/keyboard/Kconfig"
diff --git a/drivers/input/Makefile b/drivers/input/Makefile
index 99af903bd3c..2ae87b19caa 100644
--- a/drivers/input/Makefile
+++ b/drivers/input/Makefile
@@ -22,3 +22,4 @@ obj-$(CONFIG_INPUT_TABLET) += tablet/
obj-$(CONFIG_INPUT_TOUCHSCREEN) += touchscreen/
obj-$(CONFIG_INPUT_MISC) += misc/
+obj-$(CONFIG_INPUT_APMPOWER) += apm-power.o
diff --git a/drivers/input/apm-power.c b/drivers/input/apm-power.c
new file mode 100644
index 00000000000..c36d110b349
--- /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");