add gpio-button-hotplug, like button-hotplug + gpio-keys-polled, fully compatible...
authorFelix Fietkau <nbd@openwrt.org>
Mon, 20 Feb 2012 10:51:43 +0000 (10:51 +0000)
committerFelix Fietkau <nbd@openwrt.org>
Mon, 20 Feb 2012 10:51:43 +0000 (10:51 +0000)
SVN-Revision: 30659

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

diff --git a/package/gpio-button-hotplug/Makefile b/package/gpio-button-hotplug/Makefile
new file mode 100644 (file)
index 0000000..adb9a45
--- /dev/null
@@ -0,0 +1,44 @@
+#
+# Copyright (C) 2008-2012 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:=gpio-button-hotplug
+PKG_RELEASE:=1
+
+include $(INCLUDE_DIR)/package.mk
+
+define KernelPackage/gpio-button-hotplug
+  SUBMENU:=Other modules
+  TITLE:=Simple GPIO Button Hotplug driver
+  FILES:=$(PKG_BUILD_DIR)/gpio-button-hotplug.ko
+  AUTOLOAD:=$(call AutoLoad,30,gpio-button-hotplug)
+  KCONFIG:=
+endef
+
+define KernelPackage/button-hotplug/description
+  Kernel module to generate GPIO button hotplug events
+endef
+
+MAKE_OPTS:= \
+       ARCH="$(LINUX_KARCH)" \
+       CROSS_COMPILE="$(TARGET_CROSS)" \
+       SUBDIRS="$(PKG_BUILD_DIR)"
+
+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,gpio-button-hotplug))
diff --git a/package/gpio-button-hotplug/src/Makefile b/package/gpio-button-hotplug/src/Makefile
new file mode 100644 (file)
index 0000000..e968865
--- /dev/null
@@ -0,0 +1 @@
+obj-m += gpio-button-hotplug.o
diff --git a/package/gpio-button-hotplug/src/gpio-button-hotplug.c b/package/gpio-button-hotplug/src/gpio-button-hotplug.c
new file mode 100644 (file)
index 0000000..d25e70f
--- /dev/null
@@ -0,0 +1,450 @@
+/*
+ *  GPIO Button Hotplug driver
+ *
+ *  Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
+ *  Copyright (C) 2008-2010 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/workqueue.h>
+#include <linux/skbuff.h>
+#include <linux/netlink.h>
+#include <linux/kobject.h>
+#include <linux/input.h>
+#include <linux/platform_device.h>
+#include <linux/gpio.h>
+#include <linux/gpio_keys.h>
+
+#define DRV_NAME       "gpio-keys-polled"
+
+#define BH_SKB_SIZE    2048
+
+#define PFX    DRV_NAME ": "
+
+#undef BH_DEBUG
+
+#ifdef BH_DEBUG
+#define BH_DBG(fmt, args...) printk(KERN_DEBUG "%s: " fmt, DRV_NAME, ##args )
+#else
+#define BH_DBG(fmt, args...) do {} while (0)
+#endif
+
+#define BH_ERR(fmt, args...) printk(KERN_ERR "%s: " fmt, DRV_NAME, ##args )
+
+struct bh_priv {
+       unsigned long           seen;
+};
+
+struct bh_event {
+       const char              *name;
+       char                    *action;
+       unsigned long           seen;
+
+       struct sk_buff          *skb;
+       struct work_struct      work;
+};
+
+struct bh_map {
+       unsigned int    code;
+       const char      *name;
+};
+
+struct gpio_keys_button_data {
+       struct delayed_work work;
+       struct bh_priv bh;
+       int last_state;
+       int count;
+       int threshold;
+       int can_sleep;
+};
+
+extern u64 uevent_next_seqnum(void);
+
+#define BH_MAP(_code, _name)           \
+       {                               \
+               .code = (_code),        \
+               .name = (_name),        \
+       }
+
+static struct bh_map button_map[] = {
+       BH_MAP(BTN_0,           "BTN_0"),
+       BH_MAP(BTN_1,           "BTN_1"),
+       BH_MAP(BTN_2,           "BTN_2"),
+       BH_MAP(BTN_3,           "BTN_3"),
+       BH_MAP(BTN_4,           "BTN_4"),
+       BH_MAP(BTN_5,           "BTN_5"),
+       BH_MAP(BTN_6,           "BTN_6"),
+       BH_MAP(BTN_7,           "BTN_7"),
+       BH_MAP(BTN_8,           "BTN_8"),
+       BH_MAP(BTN_9,           "BTN_9"),
+       BH_MAP(KEY_RESTART,     "reset"),
+#ifdef KEY_WPS_BUTTON
+       BH_MAP(KEY_WPS_BUTTON,  "wps"),
+#endif /* KEY_WPS_BUTTON */
+};
+
+/* -------------------------------------------------------------------------*/
+
+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;
+
+       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;
+       broadcast_uevent(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(const 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 int button_get_index(unsigned int code)
+{
+       int i;
+
+       for (i = 0; i < ARRAY_SIZE(button_map); i++)
+               if (button_map[i].code == code)
+                       return i;
+
+       return -1;
+}
+static void button_hotplug_event(struct gpio_keys_button_data *data,
+                          unsigned int type, unsigned int code, int value)
+{
+       struct bh_priv *priv = &data->bh;
+       unsigned long seen = jiffies;
+       int btn;
+
+       BH_DBG("event type=%u, code=%u, value=%d\n", type, code, value);
+
+       if (type != EV_KEY)
+               return;
+
+       btn = button_get_index(code);
+       if (btn < 0)
+               return;
+
+       button_hotplug_create_event(button_map[btn].name,
+                       (seen - priv->seen) / HZ, value);
+       priv->seen = seen;
+}
+#else
+static void button_hotplug_event(struct gpio_keys_button_data *data,
+                          unsigned int type, unsigned int code, int value)
+{
+}
+#endif /* CONFIG_HOTPLUG */
+
+struct gpio_keys_polled_dev {
+       struct delayed_work work;
+
+       struct device *dev;
+       struct gpio_keys_platform_data *pdata;
+       struct gpio_keys_button_data data[0];
+};
+
+static void gpio_keys_polled_check_state(struct gpio_keys_button *button,
+                                        struct gpio_keys_button_data *bdata)
+{
+       int state;
+
+       if (bdata->can_sleep)
+               state = !!gpio_get_value_cansleep(button->gpio);
+       else
+               state = !!gpio_get_value(button->gpio);
+
+       state = !!(state ^ button->active_low);
+       if (state != bdata->last_state) {
+               unsigned int type = button->type ?: EV_KEY;
+
+               button_hotplug_event(bdata, type, button->code, state);
+               bdata->count = 0;
+               bdata->last_state = state;
+       }
+}
+
+static void gpio_keys_polled_queue_work(struct gpio_keys_polled_dev *bdev)
+{
+       struct gpio_keys_platform_data *pdata = bdev->pdata;
+       unsigned long delay = msecs_to_jiffies(pdata->poll_interval);
+
+       if (delay >= HZ)
+           delay = round_jiffies_relative(delay);
+       schedule_delayed_work(&bdev->work, delay);
+}
+
+static void gpio_keys_polled_poll(struct work_struct *work)
+{
+       struct gpio_keys_polled_dev *bdev =
+               container_of(work, struct gpio_keys_polled_dev, work.work);
+       struct gpio_keys_platform_data *pdata = bdev->pdata;
+       int i;
+
+       for (i = 0; i < bdev->pdata->nbuttons; i++) {
+               struct gpio_keys_button_data *bdata = &bdev->data[i];
+
+               if (bdata->count < bdata->threshold)
+                       bdata->count++;
+               else
+                       gpio_keys_polled_check_state(&pdata->buttons[i], bdata);
+       }
+       gpio_keys_polled_queue_work(bdev);
+}
+
+static void __devinit gpio_keys_polled_open(struct gpio_keys_polled_dev *bdev)
+{
+       struct gpio_keys_platform_data *pdata = bdev->pdata;
+       int i;
+
+       if (pdata->enable)
+               pdata->enable(bdev->dev);
+
+       /* report initial state of the buttons */
+       for (i = 0; i < pdata->nbuttons; i++)
+               gpio_keys_polled_check_state(&pdata->buttons[i], &bdev->data[i]);
+
+       gpio_keys_polled_queue_work(bdev);
+}
+
+static void __devexit gpio_keys_polled_close(struct gpio_keys_polled_dev *bdev)
+{
+       struct gpio_keys_platform_data *pdata = bdev->pdata;
+
+       cancel_delayed_work_sync(&bdev->work);
+
+       if (pdata->disable)
+               pdata->disable(bdev->dev);
+}
+
+static int __devinit gpio_keys_polled_probe(struct platform_device *pdev)
+{
+       struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
+       struct device *dev = &pdev->dev;
+       struct gpio_keys_polled_dev *bdev;
+       int error;
+       int i;
+
+       if (!pdata || !pdata->poll_interval)
+               return -EINVAL;
+
+       bdev = kzalloc(sizeof(struct gpio_keys_polled_dev) +
+                      pdata->nbuttons * sizeof(struct gpio_keys_button_data),
+                      GFP_KERNEL);
+       if (!bdev) {
+               dev_err(dev, "no memory for private data\n");
+               return -ENOMEM;
+       }
+
+       for (i = 0; i < pdata->nbuttons; i++) {
+               struct gpio_keys_button *button = &pdata->buttons[i];
+               struct gpio_keys_button_data *bdata = &bdev->data[i];
+               unsigned int gpio = button->gpio;
+
+               if (button->wakeup) {
+                       dev_err(dev, DRV_NAME " does not support wakeup\n");
+                       error = -EINVAL;
+                       goto err_free_gpio;
+               }
+
+               error = gpio_request(gpio,
+                                    button->desc ? button->desc : DRV_NAME);
+               if (error) {
+                       dev_err(dev, "unable to claim gpio %u, err=%d\n",
+                               gpio, error);
+                       goto err_free_gpio;
+               }
+
+               error = gpio_direction_input(gpio);
+               if (error) {
+                       dev_err(dev,
+                               "unable to set direction on gpio %u, err=%d\n",
+                               gpio, error);
+                       goto err_free_gpio;
+               }
+
+               bdata->can_sleep = gpio_cansleep(gpio);
+               bdata->last_state = 0;
+               bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
+                                               pdata->poll_interval);
+       }
+
+       bdev->dev = &pdev->dev;
+       bdev->pdata = pdata;
+       platform_set_drvdata(pdev, bdev);
+
+       INIT_DELAYED_WORK(&bdev->work, gpio_keys_polled_poll);
+
+       gpio_keys_polled_open(bdev);
+
+       return 0;
+
+err_free_gpio:
+       while (--i >= 0)
+               gpio_free(pdata->buttons[i].gpio);
+
+       kfree(bdev);
+       platform_set_drvdata(pdev, NULL);
+
+       return error;
+}
+
+static int __devexit gpio_keys_polled_remove(struct platform_device *pdev)
+{
+       struct gpio_keys_polled_dev *bdev = platform_get_drvdata(pdev);
+       struct gpio_keys_platform_data *pdata = bdev->pdata;
+       int i = pdata->nbuttons;
+
+       gpio_keys_polled_close(bdev);
+
+       while (--i >= 0)
+               gpio_free(pdata->buttons[i].gpio);
+
+       kfree(bdev);
+       platform_set_drvdata(pdev, NULL);
+
+       return 0;
+}
+
+static struct platform_driver gpio_keys_polled_driver = {
+       .probe  = gpio_keys_polled_probe,
+       .remove = __devexit_p(gpio_keys_polled_remove),
+       .driver = {
+               .name   = DRV_NAME,
+               .owner  = THIS_MODULE,
+       },
+};
+
+static int __init gpio_keys_polled_init(void)
+{
+       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);