add gpio-button-hotplug, like button-hotplug + gpio-keys-polled, fully compatible, but without the nasty input-core dependency chain
SVN-Revision: 30659
This commit is contained in:
Felix Fietkau
44
package/gpio-button-hotplug/Makefile
Normal file
44
package/gpio-button-hotplug/Makefile
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@@ -0,0 +1,44 @@
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#
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# Copyright (C) 2008-2012 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:=gpio-button-hotplug
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PKG_RELEASE:=1
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include $(INCLUDE_DIR)/package.mk
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define KernelPackage/gpio-button-hotplug
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SUBMENU:=Other modules
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TITLE:=Simple GPIO Button Hotplug driver
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FILES:=$(PKG_BUILD_DIR)/gpio-button-hotplug.ko
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AUTOLOAD:=$(call AutoLoad,30,gpio-button-hotplug)
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KCONFIG:=
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endef
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define KernelPackage/button-hotplug/description
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Kernel module to generate GPIO button hotplug events
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endef
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MAKE_OPTS:= \
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ARCH="$(LINUX_KARCH)" \
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CROSS_COMPILE="$(TARGET_CROSS)" \
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SUBDIRS="$(PKG_BUILD_DIR)"
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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,gpio-button-hotplug))
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1
package/gpio-button-hotplug/src/Makefile
Normal file
1
package/gpio-button-hotplug/src/Makefile
Normal file
@@ -0,0 +1 @@
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obj-m += gpio-button-hotplug.o
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450
package/gpio-button-hotplug/src/gpio-button-hotplug.c
Normal file
450
package/gpio-button-hotplug/src/gpio-button-hotplug.c
Normal file
@@ -0,0 +1,450 @@
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/*
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* GPIO Button Hotplug driver
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*
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* Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
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* Copyright (C) 2008-2010 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/workqueue.h>
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#include <linux/skbuff.h>
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#include <linux/netlink.h>
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#include <linux/kobject.h>
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#include <linux/input.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/gpio_keys.h>
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#define DRV_NAME "gpio-keys-polled"
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#define BH_SKB_SIZE 2048
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#define PFX DRV_NAME ": "
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#undef BH_DEBUG
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#ifdef BH_DEBUG
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#define BH_DBG(fmt, args...) printk(KERN_DEBUG "%s: " fmt, DRV_NAME, ##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, DRV_NAME, ##args )
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struct bh_priv {
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unsigned long seen;
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};
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struct bh_event {
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const 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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struct bh_map {
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unsigned int code;
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const char *name;
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};
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struct gpio_keys_button_data {
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struct delayed_work work;
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struct bh_priv bh;
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int last_state;
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int count;
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int threshold;
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int can_sleep;
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};
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extern u64 uevent_next_seqnum(void);
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#define BH_MAP(_code, _name) \
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{ \
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.code = (_code), \
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.name = (_name), \
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}
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static struct bh_map button_map[] = {
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BH_MAP(BTN_0, "BTN_0"),
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BH_MAP(BTN_1, "BTN_1"),
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BH_MAP(BTN_2, "BTN_2"),
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BH_MAP(BTN_3, "BTN_3"),
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BH_MAP(BTN_4, "BTN_4"),
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BH_MAP(BTN_5, "BTN_5"),
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BH_MAP(BTN_6, "BTN_6"),
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BH_MAP(BTN_7, "BTN_7"),
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BH_MAP(BTN_8, "BTN_8"),
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BH_MAP(BTN_9, "BTN_9"),
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BH_MAP(KEY_RESTART, "reset"),
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#ifdef KEY_WPS_BUTTON
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BH_MAP(KEY_WPS_BUTTON, "wps"),
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#endif /* KEY_WPS_BUTTON */
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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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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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broadcast_uevent(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(const 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 int button_get_index(unsigned int code)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(button_map); i++)
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if (button_map[i].code == code)
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return i;
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return -1;
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}
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static void button_hotplug_event(struct gpio_keys_button_data *data,
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unsigned int type, unsigned int code, int value)
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{
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struct bh_priv *priv = &data->bh;
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unsigned long seen = jiffies;
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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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btn = button_get_index(code);
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if (btn < 0)
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return;
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button_hotplug_create_event(button_map[btn].name,
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(seen - priv->seen) / HZ, value);
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priv->seen = seen;
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}
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#else
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static void button_hotplug_event(struct gpio_keys_button_data *data,
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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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struct gpio_keys_polled_dev {
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struct delayed_work work;
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struct device *dev;
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struct gpio_keys_platform_data *pdata;
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struct gpio_keys_button_data data[0];
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};
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static void gpio_keys_polled_check_state(struct gpio_keys_button *button,
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struct gpio_keys_button_data *bdata)
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{
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int state;
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if (bdata->can_sleep)
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state = !!gpio_get_value_cansleep(button->gpio);
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else
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state = !!gpio_get_value(button->gpio);
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state = !!(state ^ button->active_low);
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if (state != bdata->last_state) {
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unsigned int type = button->type ?: EV_KEY;
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button_hotplug_event(bdata, type, button->code, state);
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bdata->count = 0;
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bdata->last_state = state;
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}
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}
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static void gpio_keys_polled_queue_work(struct gpio_keys_polled_dev *bdev)
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{
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struct gpio_keys_platform_data *pdata = bdev->pdata;
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unsigned long delay = msecs_to_jiffies(pdata->poll_interval);
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if (delay >= HZ)
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delay = round_jiffies_relative(delay);
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schedule_delayed_work(&bdev->work, delay);
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}
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static void gpio_keys_polled_poll(struct work_struct *work)
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{
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struct gpio_keys_polled_dev *bdev =
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container_of(work, struct gpio_keys_polled_dev, work.work);
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struct gpio_keys_platform_data *pdata = bdev->pdata;
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int i;
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for (i = 0; i < bdev->pdata->nbuttons; i++) {
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struct gpio_keys_button_data *bdata = &bdev->data[i];
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if (bdata->count < bdata->threshold)
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bdata->count++;
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else
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gpio_keys_polled_check_state(&pdata->buttons[i], bdata);
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}
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gpio_keys_polled_queue_work(bdev);
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}
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static void __devinit gpio_keys_polled_open(struct gpio_keys_polled_dev *bdev)
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{
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struct gpio_keys_platform_data *pdata = bdev->pdata;
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int i;
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if (pdata->enable)
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pdata->enable(bdev->dev);
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/* report initial state of the buttons */
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for (i = 0; i < pdata->nbuttons; i++)
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gpio_keys_polled_check_state(&pdata->buttons[i], &bdev->data[i]);
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gpio_keys_polled_queue_work(bdev);
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}
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static void __devexit gpio_keys_polled_close(struct gpio_keys_polled_dev *bdev)
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{
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struct gpio_keys_platform_data *pdata = bdev->pdata;
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cancel_delayed_work_sync(&bdev->work);
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if (pdata->disable)
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pdata->disable(bdev->dev);
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}
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static int __devinit gpio_keys_polled_probe(struct platform_device *pdev)
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{
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struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
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struct device *dev = &pdev->dev;
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struct gpio_keys_polled_dev *bdev;
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int error;
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int i;
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if (!pdata || !pdata->poll_interval)
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return -EINVAL;
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bdev = kzalloc(sizeof(struct gpio_keys_polled_dev) +
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pdata->nbuttons * sizeof(struct gpio_keys_button_data),
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GFP_KERNEL);
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if (!bdev) {
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dev_err(dev, "no memory for private data\n");
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return -ENOMEM;
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}
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|
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for (i = 0; i < pdata->nbuttons; i++) {
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struct gpio_keys_button *button = &pdata->buttons[i];
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struct gpio_keys_button_data *bdata = &bdev->data[i];
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unsigned int gpio = button->gpio;
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|
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if (button->wakeup) {
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dev_err(dev, DRV_NAME " does not support wakeup\n");
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error = -EINVAL;
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goto err_free_gpio;
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}
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|
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error = gpio_request(gpio,
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button->desc ? button->desc : DRV_NAME);
|
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if (error) {
|
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dev_err(dev, "unable to claim gpio %u, err=%d\n",
|
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gpio, error);
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goto err_free_gpio;
|
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}
|
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|
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error = gpio_direction_input(gpio);
|
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if (error) {
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dev_err(dev,
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"unable to set direction on gpio %u, err=%d\n",
|
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gpio, error);
|
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goto err_free_gpio;
|
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}
|
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|
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bdata->can_sleep = gpio_cansleep(gpio);
|
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bdata->last_state = 0;
|
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bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
|
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pdata->poll_interval);
|
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}
|
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|
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bdev->dev = &pdev->dev;
|
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bdev->pdata = pdata;
|
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platform_set_drvdata(pdev, bdev);
|
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|
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INIT_DELAYED_WORK(&bdev->work, gpio_keys_polled_poll);
|
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|
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gpio_keys_polled_open(bdev);
|
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|
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return 0;
|
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|
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err_free_gpio:
|
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while (--i >= 0)
|
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gpio_free(pdata->buttons[i].gpio);
|
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|
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kfree(bdev);
|
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platform_set_drvdata(pdev, NULL);
|
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|
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return error;
|
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}
|
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|
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static int __devexit gpio_keys_polled_remove(struct platform_device *pdev)
|
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{
|
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struct gpio_keys_polled_dev *bdev = platform_get_drvdata(pdev);
|
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struct gpio_keys_platform_data *pdata = bdev->pdata;
|
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int i = pdata->nbuttons;
|
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|
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gpio_keys_polled_close(bdev);
|
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|
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while (--i >= 0)
|
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gpio_free(pdata->buttons[i].gpio);
|
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|
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kfree(bdev);
|
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platform_set_drvdata(pdev, NULL);
|
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|
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return 0;
|
||||
}
|
||||
|
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static struct platform_driver gpio_keys_polled_driver = {
|
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.probe = gpio_keys_polled_probe,
|
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.remove = __devexit_p(gpio_keys_polled_remove),
|
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.driver = {
|
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.name = DRV_NAME,
|
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.owner = THIS_MODULE,
|
||||
},
|
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};
|
||||
|
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static int __init gpio_keys_polled_init(void)
|
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{
|
||||
return platform_driver_register(&gpio_keys_polled_driver);
|
||||
}
|
||||
|
||||
static void __exit gpio_keys_polled_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&gpio_keys_polled_driver);
|
||||
}
|
||||
|
||||
module_init(gpio_keys_polled_init);
|
||||
module_exit(gpio_keys_polled_exit);
|
||||
|
||||
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
|
||||
MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
|
||||
MODULE_DESCRIPTION("Polled GPIO Buttons hotplug driver");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_ALIAS("platform:" DRV_NAME);
|
||||
Reference in New Issue
Block a user