add button-hotplug driver, will be usable to check status of buttons connected to...
authorGabor Juhos <juhosg@openwrt.org>
Sat, 7 Jun 2008 18:25:32 +0000 (18:25 +0000)
committerGabor Juhos <juhosg@openwrt.org>
Sat, 7 Jun 2008 18:25:32 +0000 (18:25 +0000)
SVN-Revision: 11401

package/button-hotplug/Makefile [new file with mode: 0644]
package/button-hotplug/src/Kconfig [new file with mode: 0644]
package/button-hotplug/src/Makefile [new file with mode: 0644]
package/button-hotplug/src/button-hotplug.c [new file with mode: 0644]

diff --git a/package/button-hotplug/Makefile b/package/button-hotplug/Makefile
new file mode 100644 (file)
index 0000000..64bf943
--- /dev/null
@@ -0,0 +1,53 @@
+#
+# Copyright (C) 2008 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+include $(INCLUDE_DIR)/kernel.mk
+
+PKG_NAME:=button-hotplug
+PKG_RELEASE:=1
+
+include $(INCLUDE_DIR)/package.mk
+
+define KernelPackage/button-hotplug
+  SUBMENU:=Other modules
+  TITLE:=Button Hotplug driver
+  FILES:=$(PKG_BUILD_DIR)/button-hotplug.$(LINUX_KMOD_SUFFIX)
+  KCONFIG:=
+endef
+
+define KernelPackage/button-hotplug/description
+  Kernel module to generate button hotplug events
+endef
+
+EXTRA_KCONFIG:= \
+       CONFIG_BUTTON_HOTPLUG=m
+
+EXTRA_CFLAGS:= \
+       $(patsubst CONFIG_%, -DCONFIG_%=1, $(patsubst %=m,%,$(filter %=m,$(EXTRA_KCONFIG)))) \
+       $(patsubst CONFIG_%, -DCONFIG_%=1, $(patsubst %=y,%,$(filter %=y,$(EXTRA_KCONFIG)))) \
+
+MAKE_OPTS:= \
+       ARCH="$(LINUX_KARCH)" \
+       CROSS_COMPILE="$(TARGET_CROSS)" \
+       SUBDIRS="$(PKG_BUILD_DIR)" \
+       EXTRA_CFLAGS="$(EXTRA_CFLAGS)" \
+       LINUXINCLUDE="-I$(LINUX_DIR)/include -include linux/autoconf.h" \
+       $(EXTRA_KCONFIG)
+
+define Build/Prepare
+       mkdir -p $(PKG_BUILD_DIR)
+       $(CP) ./src/* $(PKG_BUILD_DIR)/
+endef
+
+define Build/Compile
+       $(MAKE) -C "$(LINUX_DIR)" \
+               $(MAKE_OPTS) \
+               modules
+endef
+
+$(eval $(call KernelPackage,button-hotplug))
diff --git a/package/button-hotplug/src/Kconfig b/package/button-hotplug/src/Kconfig
new file mode 100644 (file)
index 0000000..aa292e9
--- /dev/null
@@ -0,0 +1,2 @@
+config BUTTON_HOTPLUG
+       tristate "Button Hotplug driver"
diff --git a/package/button-hotplug/src/Makefile b/package/button-hotplug/src/Makefile
new file mode 100644 (file)
index 0000000..230d604
--- /dev/null
@@ -0,0 +1 @@
+obj-${CONFIG_BUTTON_HOTPLUG}   += button-hotplug.o
\ No newline at end of file
diff --git a/package/button-hotplug/src/button-hotplug.c b/package/button-hotplug/src/button-hotplug.c
new file mode 100644 (file)
index 0000000..3b5527f
--- /dev/null
@@ -0,0 +1,318 @@
+/*
+ *  Button Hotplug driver
+ *
+ *  Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
+ *
+ *  Based on the diag.c - GPIO interface driver for Broadcom boards
+ *    Copyright (C) 2006 Mike Baker <mbm@openwrt.org>,
+ *    Copyright (C) 2006-2007 Felix Fietkau <nbd@openwrt.org>
+ *    Copyright (C) 2008 Andy Boyett <agb@openwrt.org>
+ *
+ *  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/version.h>
+#include <linux/kmod.h>
+#include <linux/input.h>
+
+#include <linux/workqueue.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+#include <net/sock.h>
+
+#define DRV_NAME       "button-hotplug"
+#define DRV_VERSION    "0.3.0"
+#define DRV_DESC       "Button Hotplug driver"
+
+#define BH_SKB_SIZE    2048
+
+#define BH_BTN_MIN     BTN_0
+#define BH_BTN_MAX     BTN_9
+
+#define BH_BTN_COUNT   (BH_BTN_MAX - BH_BTN_MIN + 1)
+
+#define PFX    DRV_NAME ": "
+
+/*#define BH_DEBUG*/
+
+#ifdef BH_DEBUG
+#define BH_DBG(fmt, args...) printk(KERN_DEBUG "%s" fmt, ##args )
+#else
+#define BH_DBG(fmt, args...) do {} while (0)
+#endif
+
+#define BH_ERR(fmt, args...) printk(KERN_ERR "%s" fmt, ##args )
+
+struct bh_priv {
+       unsigned long           seen[BH_BTN_COUNT];
+       struct input_handle     handle;
+};
+
+struct bh_event {
+       char                    *name;
+       char                    *action;
+       unsigned long           seen;
+
+       struct sk_buff          *skb;
+       struct work_struct      work;
+};
+
+extern struct sock *uevent_sock;
+extern u64 uevent_next_seqnum(void);
+
+static char *button_names[BH_BTN_COUNT] = {
+       "BTN_0", "BTN_1", "BTN_2", "BTN_3", "BTN_4",
+       "BTN_5", "BTN_6", "BTN_7", "BTN_8", "BTN_9"
+};
+
+/* -------------------------------------------------------------------------*/
+
+static int bh_event_add_var(struct bh_event *event, int argv,
+               const char *format, ...)
+{
+       static char buf[128];
+       char *s;
+       va_list args;
+       int len;
+
+       if (argv)
+               return 0;
+
+       va_start(args, format);
+       len = vsnprintf(buf, sizeof(buf), format, args);
+       va_end(args);
+
+       if (len >= sizeof(buf)) {
+               BH_ERR("buffer size too small\n");
+               WARN_ON(1);
+               return -ENOMEM;
+       }
+
+       s = skb_put(event->skb, len + 1);
+       strcpy(s, buf);
+
+       BH_DBG("added variable '%s'\n", s);
+
+       return 0;
+}
+
+static int button_hotplug_fill_event(struct bh_event *event)
+{
+       int ret;
+
+       ret = bh_event_add_var(event, 0, "HOME=%s", "/");
+       if (ret)
+               return ret;
+
+       ret = bh_event_add_var(event, 0, "PATH=%s",
+                                       "/sbin:/bin:/usr/sbin:/usr/bin");
+       if (ret)
+               return ret;
+
+       ret = bh_event_add_var(event, 0, "SUBSYSTEM=%s", "button");
+       if (ret)
+               return ret;
+
+       ret = bh_event_add_var(event, 0, "ACTION=%s", event->action);
+       if (ret)
+               return ret;
+
+       ret = bh_event_add_var(event, 0, "BUTTON=%s", event->name);
+       if (ret)
+               return ret;
+
+       ret = bh_event_add_var(event, 0, "SEEN=%ld", event->seen);
+       if (ret)
+               return ret;
+
+       ret = bh_event_add_var(event, 0, "SEQNUM=%llu", uevent_next_seqnum());
+
+       return ret;
+}
+
+static void button_hotplug_work(struct work_struct *work)
+{
+       struct bh_event *event = container_of(work, struct bh_event, work);
+       int ret = 0;
+
+       if (!uevent_sock)
+               goto out_free_event;
+
+       event->skb = alloc_skb(BH_SKB_SIZE, GFP_KERNEL);
+       if (!event->skb)
+               goto out_free_event;
+
+       ret = bh_event_add_var(event, 0, "%s@", event->action);
+       if (ret)
+               goto out_free_skb;
+
+       ret = button_hotplug_fill_event(event);
+       if (ret)
+               goto out_free_skb;
+
+       NETLINK_CB(event->skb).dst_group = 1;
+       netlink_broadcast(uevent_sock, event->skb, 0, 1, GFP_KERNEL);
+
+ out_free_skb:
+       if (ret) {
+               BH_ERR("work error %d\n", ret);
+               kfree_skb(event->skb);
+       }
+ out_free_event:
+       kfree(event);
+}
+
+static int button_hotplug_create_event(char *name, unsigned long seen,
+               int pressed)
+{
+       struct bh_event *event;
+
+       BH_DBG("create event, name=%s, seen=%lu, pressed=%d\n",
+               name, seen, pressed);
+
+       event = kzalloc(sizeof(*event), GFP_KERNEL);
+       if (!event)
+               return -ENOMEM;
+
+       event->name = name;
+       event->seen = seen;
+       event->action = pressed ? "pressed" : "released";
+
+       INIT_WORK(&event->work, (void *)(void *)button_hotplug_work);
+       schedule_work(&event->work);
+
+       return 0;
+}
+
+/* -------------------------------------------------------------------------*/
+
+#ifdef CONFIG_HOTPLUG
+static void button_hotplug_event(struct input_handle *handle,
+                          unsigned int type, unsigned int code, int value)
+{
+       struct bh_priv *priv = handle->private;
+       unsigned long seen = jiffies;
+       unsigned int btn;
+
+       BH_DBG("event type=%u, code=%u, value=%d\n", type, code, value);
+
+       if (type != EV_KEY)
+               return;
+
+       if (code < BH_BTN_MIN || code > BH_BTN_MAX)
+               return;
+
+       btn = code - BH_BTN_MIN;
+       button_hotplug_create_event(button_names[btn],
+                       (seen - priv->seen[btn]) / HZ, value);
+       priv->seen[btn] = seen;
+}
+#else
+static void button_hotplug_event(struct input_handle *handle,
+                          unsigned int type, unsigned int code, int value)
+{
+}
+#endif /* CONFIG_HOTPLUG */
+
+static int button_hotplug_connect(struct input_handler *handler,
+               struct input_dev *dev, const struct input_device_id *id)
+{
+       struct bh_priv *priv;
+       int ret;
+       int i;
+
+       for (i = BH_BTN_MIN; i <= BH_BTN_MAX; i++)
+               if (test_bit(i, dev->keybit))
+                       break;
+
+       if (i > BH_BTN_MAX)
+               return -ENODEV;
+
+       priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+       if (!priv)
+               return -ENOMEM;
+
+       priv->handle.private = priv;
+       priv->handle.dev = dev;
+       priv->handle.handler = handler;
+       priv->handle.name = DRV_NAME;
+
+       ret = input_register_handle(&priv->handle);
+       if (ret)
+               goto err_free_priv;
+
+       ret = input_open_device(&priv->handle);
+       if (ret)
+               goto err_unregister_handle;
+
+       BH_DBG("connected to %s\n", dev->name);
+
+       return 0;
+
+ err_unregister_handle:
+       input_unregister_handle(&priv->handle);
+
+ err_free_priv:
+       kfree(priv);
+       return ret;
+}
+
+static void button_hotplug_disconnect(struct input_handle *handle)
+{
+       struct bh_priv *priv = handle->private;
+
+       input_close_device(handle);
+       input_unregister_handle(handle);
+
+       kfree(priv);
+}
+
+static const struct input_device_id button_hotplug_ids[] = {
+       {
+                .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
+                .evbit = { BIT_MASK(EV_KEY) },
+        },
+       {
+               /* Terminating entry */
+       },
+};
+
+MODULE_DEVICE_TABLE(input, button_hotplug_ids);
+
+static struct input_handler button_hotplug_handler = {
+       .event =        button_hotplug_event,
+       .connect =      button_hotplug_connect,
+       .disconnect =   button_hotplug_disconnect,
+       .name =         DRV_NAME,
+       .id_table =     button_hotplug_ids,
+};
+
+/* -------------------------------------------------------------------------*/
+
+static int __init button_hotplug_init(void)
+{
+       int ret;
+
+       printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n");
+       ret = input_register_handler(&button_hotplug_handler);
+       if (ret)
+               BH_ERR("unable to register input handler\n");
+
+       return ret;
+}
+module_init(button_hotplug_init);
+
+static void __exit button_hotplug_exit(void)
+{
+       input_unregister_handler(&button_hotplug_handler);
+}
+module_exit(button_hotplug_exit);
+
+MODULE_DESCRIPTION(DRV_DESC);
+MODULE_VERSION(DRV_VERSION);
+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
+MODULE_LICENSE("GPL v2");
+