diff options
| -rw-r--r-- | package/button-hotplug/Makefile | 53 | ||||
| -rw-r--r-- | package/button-hotplug/src/Kconfig | 2 | ||||
| -rw-r--r-- | package/button-hotplug/src/Makefile | 1 | ||||
| -rw-r--r-- | package/button-hotplug/src/button-hotplug.c | 318 |
4 files changed, 374 insertions, 0 deletions
diff --git a/package/button-hotplug/Makefile b/package/button-hotplug/Makefile new file mode 100644 index 000000000..64bf94394 --- /dev/null +++ b/package/button-hotplug/Makefile @@ -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 $(call KernelPackage,button-hotplug)) diff --git a/package/button-hotplug/src/Kconfig b/package/button-hotplug/src/Kconfig new file mode 100644 index 000000000..aa292e9c1 --- /dev/null +++ b/package/button-hotplug/src/Kconfig @@ -0,0 +1,2 @@ +config BUTTON_HOTPLUG + tristate "Button Hotplug driver" diff --git a/package/button-hotplug/src/Makefile b/package/button-hotplug/src/Makefile new file mode 100644 index 000000000..230d604f8 --- /dev/null +++ b/package/button-hotplug/src/Makefile @@ -0,0 +1 @@ +obj-${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 index 000000000..3b5527fcf --- /dev/null +++ b/package/button-hotplug/src/button-hotplug.c @@ -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"); + |