add button-hotplug driver, will be usable to check status of buttons connected to GPIO lines
SVN-Revision: 11401
This commit is contained in:
Gabor Juhos
parent
64fddc8d81
commit
50a749e9a7
4 changed files with 374 additions and 0 deletions
53
package/button-hotplug/Makefile
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53
package/button-hotplug/Makefile
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#
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# Copyright (C) 2008 OpenWrt.org
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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include $(TOPDIR)/rules.mk
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include $(INCLUDE_DIR)/kernel.mk
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PKG_NAME:=button-hotplug
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PKG_RELEASE:=1
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include $(INCLUDE_DIR)/package.mk
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define KernelPackage/button-hotplug
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SUBMENU:=Other modules
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TITLE:=Button Hotplug driver
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FILES:=$(PKG_BUILD_DIR)/button-hotplug.$(LINUX_KMOD_SUFFIX)
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KCONFIG:=
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endef
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define KernelPackage/button-hotplug/description
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Kernel module to generate button hotplug events
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endef
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EXTRA_KCONFIG:= \
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CONFIG_BUTTON_HOTPLUG=m
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EXTRA_CFLAGS:= \
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$(patsubst CONFIG_%, -DCONFIG_%=1, $(patsubst %=m,%,$(filter %=m,$(EXTRA_KCONFIG)))) \
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$(patsubst CONFIG_%, -DCONFIG_%=1, $(patsubst %=y,%,$(filter %=y,$(EXTRA_KCONFIG)))) \
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MAKE_OPTS:= \
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ARCH="$(LINUX_KARCH)" \
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CROSS_COMPILE="$(TARGET_CROSS)" \
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SUBDIRS="$(PKG_BUILD_DIR)" \
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EXTRA_CFLAGS="$(EXTRA_CFLAGS)" \
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LINUXINCLUDE="-I$(LINUX_DIR)/include -include linux/autoconf.h" \
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$(EXTRA_KCONFIG)
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define Build/Prepare
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mkdir -p $(PKG_BUILD_DIR)
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$(CP) ./src/* $(PKG_BUILD_DIR)/
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endef
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define Build/Compile
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$(MAKE) -C "$(LINUX_DIR)" \
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$(MAKE_OPTS) \
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modules
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endef
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$(eval $(call KernelPackage,button-hotplug))
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2
package/button-hotplug/src/Kconfig
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2
package/button-hotplug/src/Kconfig
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@ -0,0 +1,2 @@
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config BUTTON_HOTPLUG
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tristate "Button Hotplug driver"
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1
package/button-hotplug/src/Makefile
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1
package/button-hotplug/src/Makefile
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@ -0,0 +1 @@
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obj-${CONFIG_BUTTON_HOTPLUG} += button-hotplug.o
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318
package/button-hotplug/src/button-hotplug.c
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318
package/button-hotplug/src/button-hotplug.c
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/*
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* Button Hotplug driver
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*
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* Copyright (C) 2008 Gabor Juhos <juhosg@openwrt.org>
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*
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* Based on the diag.c - GPIO interface driver for Broadcom boards
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* Copyright (C) 2006 Mike Baker <mbm@openwrt.org>,
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* Copyright (C) 2006-2007 Felix Fietkau <nbd@openwrt.org>
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* Copyright (C) 2008 Andy Boyett <agb@openwrt.org>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published
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* by the Free Software Foundation.
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*/
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#include <linux/module.h>
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#include <linux/version.h>
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#include <linux/kmod.h>
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#include <linux/input.h>
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#include <linux/workqueue.h>
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <net/sock.h>
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#define DRV_NAME "button-hotplug"
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#define DRV_VERSION "0.3.0"
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#define DRV_DESC "Button Hotplug driver"
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#define BH_SKB_SIZE 2048
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#define BH_BTN_MIN BTN_0
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#define BH_BTN_MAX BTN_9
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#define BH_BTN_COUNT (BH_BTN_MAX - BH_BTN_MIN + 1)
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#define PFX DRV_NAME ": "
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/*#define BH_DEBUG*/
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#ifdef BH_DEBUG
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#define BH_DBG(fmt, args...) printk(KERN_DEBUG "%s" fmt, ##args )
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#else
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#define BH_DBG(fmt, args...) do {} while (0)
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#endif
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#define BH_ERR(fmt, args...) printk(KERN_ERR "%s" fmt, ##args )
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struct bh_priv {
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unsigned long seen[BH_BTN_COUNT];
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struct input_handle handle;
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};
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struct bh_event {
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char *name;
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char *action;
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unsigned long seen;
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struct sk_buff *skb;
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struct work_struct work;
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};
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extern struct sock *uevent_sock;
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extern u64 uevent_next_seqnum(void);
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static char *button_names[BH_BTN_COUNT] = {
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"BTN_0", "BTN_1", "BTN_2", "BTN_3", "BTN_4",
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"BTN_5", "BTN_6", "BTN_7", "BTN_8", "BTN_9"
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};
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/* -------------------------------------------------------------------------*/
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static int bh_event_add_var(struct bh_event *event, int argv,
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const char *format, ...)
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{
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static char buf[128];
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char *s;
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va_list args;
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int len;
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if (argv)
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return 0;
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va_start(args, format);
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len = vsnprintf(buf, sizeof(buf), format, args);
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va_end(args);
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if (len >= sizeof(buf)) {
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BH_ERR("buffer size too small\n");
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WARN_ON(1);
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return -ENOMEM;
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}
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s = skb_put(event->skb, len + 1);
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strcpy(s, buf);
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BH_DBG("added variable '%s'\n", s);
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return 0;
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}
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static int button_hotplug_fill_event(struct bh_event *event)
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{
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int ret;
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ret = bh_event_add_var(event, 0, "HOME=%s", "/");
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if (ret)
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return ret;
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ret = bh_event_add_var(event, 0, "PATH=%s",
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"/sbin:/bin:/usr/sbin:/usr/bin");
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if (ret)
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return ret;
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ret = bh_event_add_var(event, 0, "SUBSYSTEM=%s", "button");
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if (ret)
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return ret;
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ret = bh_event_add_var(event, 0, "ACTION=%s", event->action);
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if (ret)
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return ret;
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ret = bh_event_add_var(event, 0, "BUTTON=%s", event->name);
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if (ret)
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return ret;
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ret = bh_event_add_var(event, 0, "SEEN=%ld", event->seen);
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if (ret)
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return ret;
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ret = bh_event_add_var(event, 0, "SEQNUM=%llu", uevent_next_seqnum());
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return ret;
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}
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static void button_hotplug_work(struct work_struct *work)
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{
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struct bh_event *event = container_of(work, struct bh_event, work);
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int ret = 0;
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if (!uevent_sock)
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goto out_free_event;
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event->skb = alloc_skb(BH_SKB_SIZE, GFP_KERNEL);
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if (!event->skb)
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goto out_free_event;
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ret = bh_event_add_var(event, 0, "%s@", event->action);
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if (ret)
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goto out_free_skb;
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ret = button_hotplug_fill_event(event);
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if (ret)
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goto out_free_skb;
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NETLINK_CB(event->skb).dst_group = 1;
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netlink_broadcast(uevent_sock, event->skb, 0, 1, GFP_KERNEL);
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out_free_skb:
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if (ret) {
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BH_ERR("work error %d\n", ret);
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kfree_skb(event->skb);
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}
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out_free_event:
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kfree(event);
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}
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static int button_hotplug_create_event(char *name, unsigned long seen,
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int pressed)
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{
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struct bh_event *event;
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BH_DBG("create event, name=%s, seen=%lu, pressed=%d\n",
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name, seen, pressed);
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event = kzalloc(sizeof(*event), GFP_KERNEL);
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if (!event)
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return -ENOMEM;
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event->name = name;
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event->seen = seen;
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event->action = pressed ? "pressed" : "released";
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INIT_WORK(&event->work, (void *)(void *)button_hotplug_work);
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schedule_work(&event->work);
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return 0;
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}
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/* -------------------------------------------------------------------------*/
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#ifdef CONFIG_HOTPLUG
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static void button_hotplug_event(struct input_handle *handle,
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unsigned int type, unsigned int code, int value)
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{
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struct bh_priv *priv = handle->private;
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unsigned long seen = jiffies;
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unsigned int btn;
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BH_DBG("event type=%u, code=%u, value=%d\n", type, code, value);
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if (type != EV_KEY)
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return;
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if (code < BH_BTN_MIN || code > BH_BTN_MAX)
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return;
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btn = code - BH_BTN_MIN;
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button_hotplug_create_event(button_names[btn],
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(seen - priv->seen[btn]) / HZ, value);
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priv->seen[btn] = seen;
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}
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#else
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static void button_hotplug_event(struct input_handle *handle,
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unsigned int type, unsigned int code, int value)
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{
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}
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#endif /* CONFIG_HOTPLUG */
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static int button_hotplug_connect(struct input_handler *handler,
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struct input_dev *dev, const struct input_device_id *id)
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{
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struct bh_priv *priv;
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int ret;
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int i;
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for (i = BH_BTN_MIN; i <= BH_BTN_MAX; i++)
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if (test_bit(i, dev->keybit))
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break;
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if (i > BH_BTN_MAX)
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return -ENODEV;
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priv = kzalloc(sizeof(*priv), GFP_KERNEL);
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if (!priv)
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return -ENOMEM;
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priv->handle.private = priv;
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priv->handle.dev = dev;
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priv->handle.handler = handler;
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priv->handle.name = DRV_NAME;
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ret = input_register_handle(&priv->handle);
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if (ret)
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goto err_free_priv;
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ret = input_open_device(&priv->handle);
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if (ret)
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goto err_unregister_handle;
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BH_DBG("connected to %s\n", dev->name);
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return 0;
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err_unregister_handle:
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input_unregister_handle(&priv->handle);
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err_free_priv:
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kfree(priv);
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return ret;
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}
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static void button_hotplug_disconnect(struct input_handle *handle)
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{
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struct bh_priv *priv = handle->private;
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input_close_device(handle);
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input_unregister_handle(handle);
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kfree(priv);
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}
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static const struct input_device_id button_hotplug_ids[] = {
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{
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.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
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.evbit = { BIT_MASK(EV_KEY) },
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},
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{
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/* Terminating entry */
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},
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};
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MODULE_DEVICE_TABLE(input, button_hotplug_ids);
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static struct input_handler button_hotplug_handler = {
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.event = button_hotplug_event,
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.connect = button_hotplug_connect,
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.disconnect = button_hotplug_disconnect,
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.name = DRV_NAME,
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.id_table = button_hotplug_ids,
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};
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/* -------------------------------------------------------------------------*/
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static int __init button_hotplug_init(void)
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{
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int ret;
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printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n");
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ret = input_register_handler(&button_hotplug_handler);
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if (ret)
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BH_ERR("unable to register input handler\n");
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return ret;
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}
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module_init(button_hotplug_init);
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static void __exit button_hotplug_exit(void)
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{
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input_unregister_handler(&button_hotplug_handler);
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}
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module_exit(button_hotplug_exit);
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MODULE_DESCRIPTION(DRV_DESC);
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MODULE_VERSION(DRV_VERSION);
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MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
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MODULE_LICENSE("GPL v2");
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