From 716ca530e1c4515d8683c9d5be3d56b301758b66 Mon Sep 17 00:00:00 2001 From: James <> Date: Wed, 4 Nov 2015 11:49:21 +0000 Subject: trunk-47381 --- .../gpio-button-hotplug/src/gpio-button-hotplug.c | 670 +++++++++++++++++++++ 1 file changed, 670 insertions(+) create mode 100644 package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c (limited to 'package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c') diff --git a/package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c b/package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c new file mode 100644 index 0000000..029a388 --- /dev/null +++ b/package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c @@ -0,0 +1,670 @@ +/* + * GPIO Button Hotplug driver + * + * Copyright (C) 2012 Felix Fietkau + * Copyright (C) 2008-2010 Gabor Juhos + * + * Based on the diag.c - GPIO interface driver for Broadcom boards + * Copyright (C) 2006 Mike Baker , + * Copyright (C) 2006-2007 Felix Fietkau + * Copyright (C) 2008 Andy Boyett + * + * 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 +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#define DRV_NAME "gpio-keys" + +#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; + unsigned int type; + 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; + struct gpio_keys_button *b; +}; + +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_POWER, "power"), + BH_MAP(KEY_RESTART, "reset"), + BH_MAP(KEY_RFKILL, "rfkill"), + BH_MAP(KEY_WPS_BUTTON, "wps"), + BH_MAP(KEY_WIMAX, "wwan"), +}; + +/* -------------------------------------------------------------------------*/ + +static __printf(3, 4) +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)) { + WARN(1, "buffer size too small"); + 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; + + if (event->type == EV_SW) { + ret = bh_event_add_var(event, 0, "TYPE=%s", "switch"); + 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 int type, + 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->type = type; + event->seen = seen; + event->action = pressed ? "pressed" : "released"; + + INIT_WORK(&event->work, (void *)(void *)button_hotplug_work); + schedule_work(&event->work); + + return 0; +} + +/* -------------------------------------------------------------------------*/ + +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, 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, data->b->code, value); + + if ((type != EV_KEY) && (type != EV_SW)) + return; + + btn = button_get_index(data->b->code); + if (btn < 0) + return; + + button_hotplug_create_event(button_map[btn].name, type, + (seen - priv->seen) / HZ, value); + priv->seen = seen; +} + +struct gpio_keys_button_dev { + int polled; + struct delayed_work work; + + struct device *dev; + struct gpio_keys_platform_data *pdata; + struct gpio_keys_button_data data[0]; +}; + +static int gpio_button_get_value(struct gpio_keys_button_data *bdata) +{ + int val; + + if (bdata->can_sleep) + val = !!gpio_get_value_cansleep(bdata->b->gpio); + else + val = !!gpio_get_value(bdata->b->gpio); + + return val ^ bdata->b->active_low; +} + +static void gpio_keys_polled_check_state(struct gpio_keys_button_data *bdata) +{ + int state = gpio_button_get_value(bdata); + + if (state != bdata->last_state) { + unsigned int type = bdata->b->type ?: EV_KEY; + + if (bdata->count < bdata->threshold) { + bdata->count++; + return; + } + + if ((bdata->last_state != -1) || (type == EV_SW)) + button_hotplug_event(bdata, type, state); + + bdata->last_state = state; + } + + bdata->count = 0; +} + +static void gpio_keys_polled_queue_work(struct gpio_keys_button_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_button_dev *bdev = + container_of(work, struct gpio_keys_button_dev, work.work); + int i; + + for (i = 0; i < bdev->pdata->nbuttons; i++) { + struct gpio_keys_button_data *bdata = &bdev->data[i]; + gpio_keys_polled_check_state(bdata); + } + gpio_keys_polled_queue_work(bdev); +} + +static void gpio_keys_polled_close(struct gpio_keys_button_dev *bdev) +{ + struct gpio_keys_platform_data *pdata = bdev->pdata; + + cancel_delayed_work_sync(&bdev->work); + + if (pdata->disable) + pdata->disable(bdev->dev); +} + +static irqreturn_t button_handle_irq(int irq, void *_bdata) +{ + struct gpio_keys_button_data *bdata = (struct gpio_keys_button_data *) _bdata; + + button_hotplug_event(bdata, bdata->b->type ?: EV_KEY, gpio_button_get_value(bdata)); + + return IRQ_HANDLED; +} + +#ifdef CONFIG_OF +static struct gpio_keys_platform_data * +gpio_keys_get_devtree_pdata(struct device *dev) +{ + struct device_node *node, *pp; + struct gpio_keys_platform_data *pdata; + struct gpio_keys_button *button; + int error; + int nbuttons; + int i = 0; + + node = dev->of_node; + if (!node) + return NULL; + + nbuttons = of_get_child_count(node); + if (nbuttons == 0) + return NULL; + + pdata = devm_kzalloc(dev, sizeof(*pdata) + nbuttons * (sizeof *button), + GFP_KERNEL); + if (!pdata) { + error = -ENOMEM; + goto err_out; + } + + pdata->buttons = (struct gpio_keys_button *)(pdata + 1); + pdata->nbuttons = nbuttons; + + pdata->rep = !!of_get_property(node, "autorepeat", NULL); + of_property_read_u32(node, "poll-interval", &pdata->poll_interval); + + for_each_child_of_node(node, pp) { + enum of_gpio_flags flags; + + if (!of_find_property(pp, "gpios", NULL)) { + pdata->nbuttons--; + dev_warn(dev, "Found button without gpios\n"); + continue; + } + + button = &pdata->buttons[i++]; + + button->gpio = of_get_gpio_flags(pp, 0, &flags); + if (button->gpio < 0) { + error = button->gpio; + if (error != -ENOENT) { + if (error != -EPROBE_DEFER) + dev_err(dev, + "Failed to get gpio flags, error: %d\n", + error); + return ERR_PTR(error); + } + } else { + button->active_low = flags & OF_GPIO_ACTIVE_LOW; + } + + if (of_property_read_u32(pp, "linux,code", &button->code)) { + dev_err(dev, "Button without keycode: 0x%x\n", + button->gpio); + error = -EINVAL; + goto err_out; + } + + button->desc = of_get_property(pp, "label", NULL); + + if (of_property_read_u32(pp, "linux,input-type", &button->type)) + button->type = EV_KEY; + + button->wakeup = !!of_get_property(pp, "gpio-key,wakeup", NULL); + + if (of_property_read_u32(pp, "debounce-interval", + &button->debounce_interval)) + button->debounce_interval = 5; + } + + if (pdata->nbuttons == 0) { + error = -EINVAL; + goto err_out; + } + + return pdata; + +err_out: + return ERR_PTR(error); +} + +static struct of_device_id gpio_keys_of_match[] = { + { .compatible = "gpio-keys", }, + { }, +}; +MODULE_DEVICE_TABLE(of, gpio_keys_of_match); + +static struct of_device_id gpio_keys_polled_of_match[] = { + { .compatible = "gpio-keys-polled", }, + { }, +}; +MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match); + +#else + +static inline struct gpio_keys_platform_data * +gpio_keys_get_devtree_pdata(struct device *dev) +{ + return NULL; +} +#endif + +static int gpio_keys_button_probe(struct platform_device *pdev, + struct gpio_keys_button_dev **_bdev, int polled) +{ + struct gpio_keys_platform_data *pdata = pdev->dev.platform_data; + struct device *dev = &pdev->dev; + struct gpio_keys_button_dev *bdev; + struct gpio_keys_button *buttons; + int error; + int i; + + if (!pdata) { + pdata = gpio_keys_get_devtree_pdata(dev); + if (IS_ERR(pdata)) + return PTR_ERR(pdata); + if (!pdata) { + dev_err(dev, "missing platform data\n"); + return -EINVAL; + } + pdev->dev.platform_data = pdata; + } + + if (polled && !pdata->poll_interval) { + dev_err(dev, "missing poll_interval value\n"); + return -EINVAL; + } + + buttons = devm_kzalloc(dev, pdata->nbuttons * sizeof(struct gpio_keys_button), + GFP_KERNEL); + if (!buttons) { + dev_err(dev, "no memory for button data\n"); + return -ENOMEM; + } + memcpy(buttons, pdata->buttons, pdata->nbuttons * sizeof(struct gpio_keys_button)); + + bdev = devm_kzalloc(dev, sizeof(struct gpio_keys_button_dev) + + pdata->nbuttons * sizeof(struct gpio_keys_button_data), + GFP_KERNEL); + if (!bdev) { + dev_err(dev, "no memory for private data\n"); + return -ENOMEM; + } + + bdev->polled = polled; + + for (i = 0; i < pdata->nbuttons; i++) { + struct gpio_keys_button *button = &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"); + return -EINVAL; + } + + error = devm_gpio_request(dev, gpio, + button->desc ? button->desc : DRV_NAME); + if (error) { + dev_err(dev, "unable to claim gpio %u, err=%d\n", + gpio, error); + return error; + } + + error = gpio_direction_input(gpio); + if (error) { + dev_err(dev, + "unable to set direction on gpio %u, err=%d\n", + gpio, error); + return error; + } + + bdata->can_sleep = gpio_cansleep(gpio); + bdata->last_state = -1; + + if (bdev->polled) + bdata->threshold = DIV_ROUND_UP(button->debounce_interval, + pdata->poll_interval); + else + bdata->threshold = 1; + + bdata->b = &pdata->buttons[i]; + } + + bdev->dev = &pdev->dev; + bdev->pdata = pdata; + platform_set_drvdata(pdev, bdev); + + *_bdev = bdev; + + return 0; +} + +static int gpio_keys_probe(struct platform_device *pdev) +{ + struct gpio_keys_platform_data *pdata; + struct gpio_keys_button_dev *bdev; + int ret, i; + + + ret = gpio_keys_button_probe(pdev, &bdev, 0); + + if (ret) + return ret; + + pdata = pdev->dev.platform_data; + for (i = 0; i < pdata->nbuttons; i++) { + struct gpio_keys_button *button = &pdata->buttons[i]; + struct gpio_keys_button_data *bdata = &bdev->data[i]; + + if (bdata->can_sleep) { + dev_err(&pdev->dev, "skipping gpio:%d, it can sleep\n", button->gpio); + continue; + } + if (!button->irq) + button->irq = gpio_to_irq(button->gpio); + if (button->irq < 0) { + dev_err(&pdev->dev, "failed to get irq for gpio:%d\n", button->gpio); + continue; + } + ret = devm_request_irq(&pdev->dev, button->irq, button_handle_irq, + IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING, + dev_name(&pdev->dev), bdata); + if (ret) + dev_err(&pdev->dev, "failed to request irq:%d for gpio:%d\n", button->irq, button->gpio); + else + dev_dbg(&pdev->dev, "gpio:%d has irq:%d\n", button->gpio, button->irq); + + if (bdata->b->type == EV_SW) + button_hotplug_event(bdata, EV_SW, gpio_button_get_value(bdata)); + } + + return 0; +} + +static int gpio_keys_polled_probe(struct platform_device *pdev) +{ + struct gpio_keys_platform_data *pdata; + struct gpio_keys_button_dev *bdev; + int ret; + int i; + + ret = gpio_keys_button_probe(pdev, &bdev, 1); + + if (ret) + return ret; + + INIT_DELAYED_WORK(&bdev->work, gpio_keys_polled_poll); + + pdata = bdev->pdata; + + if (pdata->enable) + pdata->enable(bdev->dev); + + for (i = 0; i < pdata->nbuttons; i++) + gpio_keys_polled_check_state(&bdev->data[i]); + + gpio_keys_polled_queue_work(bdev); + + return ret; +} + +static int gpio_keys_remove(struct platform_device *pdev) +{ + struct gpio_keys_button_dev *bdev = platform_get_drvdata(pdev); + + platform_set_drvdata(pdev, NULL); + + if (bdev->polled) + gpio_keys_polled_close(bdev); + + return 0; +} + +static struct platform_driver gpio_keys_driver = { + .probe = gpio_keys_probe, + .remove = gpio_keys_remove, + .driver = { + .name = "gpio-keys", + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(gpio_keys_of_match), + }, +}; + +static struct platform_driver gpio_keys_polled_driver = { + .probe = gpio_keys_polled_probe, + .remove = gpio_keys_remove, + .driver = { + .name = "gpio-keys-polled", + .owner = THIS_MODULE, + .of_match_table = of_match_ptr(gpio_keys_polled_of_match), + }, +}; + +static int __init gpio_button_init(void) +{ + int ret; + + ret = platform_driver_register(&gpio_keys_driver); + if (ret) + return ret; + + ret = platform_driver_register(&gpio_keys_polled_driver); + if (ret) + platform_driver_unregister(&gpio_keys_driver); + + return ret; +} + +static void __exit gpio_button_exit(void) +{ + platform_driver_unregister(&gpio_keys_driver); + platform_driver_unregister(&gpio_keys_polled_driver); +} + +module_init(gpio_button_init); +module_exit(gpio_button_exit); + +MODULE_AUTHOR("Gabor Juhos "); +MODULE_AUTHOR("Felix Fietkau "); +MODULE_DESCRIPTION("Polled GPIO Buttons hotplug driver"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform:" DRV_NAME); -- cgit v1.2.3