From f7cb07b26d83c0b24689f6efc65770e17b5dd2df Mon Sep 17 00:00:00 2001 From: Michael Gernoth Date: Mon, 4 Jul 2011 12:13:58 +0200 Subject: [PATCH 1/1] allow tuning of more flags in /sys/devices/debounce --- debounce.c | 156 ++++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 137 insertions(+), 19 deletions(-) diff --git a/debounce.c b/debounce.c index c138574..cefa1d9 100644 --- a/debounce.c +++ b/debounce.c @@ -25,14 +25,134 @@ static int find_ms2_dev(struct device *dev, void *data) return 0; } +static ssize_t show_debounce_delay(struct device *dev, struct device_attribute *attr, char *buf) +{ + if (!gpio_evmi) + return -ENODEV; + + return snprintf(buf, PAGE_SIZE, "%ld\n", (gpio_evmi->debounce_delay.tv.nsec / NSEC_PER_MSEC)); +} + +static void set_debounce_delay(long delay) +{ + if (gpio_evmi->debounce_delay.tv.nsec != delay * NSEC_PER_MSEC) { + printk(KERN_INFO PREFIX "Changing debounce_delay\n"); + gpio_evmi->debounce_delay.tv.nsec = delay * NSEC_PER_MSEC; + debounce_delay = delay; + printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec); + } + + if (gpio_evmi->debounce_delay.tv.nsec != 0) { + if (!(gpio_evmi->flags & GPIOKPF_DEBOUNCE)) { + printk(KERN_INFO PREFIX "Activating debounce\n"); + gpio_evmi->flags |= GPIOKPF_DEBOUNCE; + } + } else { + if (gpio_evmi->flags & GPIOKPF_DEBOUNCE) { + printk(KERN_INFO PREFIX "Deactivating debounce\n"); + gpio_evmi->flags &= ~GPIOKPF_DEBOUNCE; + } + } +} + +static ssize_t store_debounce_delay(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + long int delay; + + if (!gpio_evmi) + return -ENODEV; + + sscanf(buf, "%ld", &delay); + set_debounce_delay(delay); + + return strnlen(buf, PAGE_SIZE); +} + +static ssize_t show_settle_time(struct device *dev, struct device_attribute *attr, char *buf) +{ + if (!gpio_evmi) + return -ENODEV; + + return snprintf(buf, PAGE_SIZE, "%ld\n", (gpio_evmi->settle_time.tv.nsec / NSEC_PER_USEC)); +} + +static ssize_t store_settle_time(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + long int delay; + + if (!gpio_evmi) + return -ENODEV; + + sscanf(buf, "%ld", &delay); + gpio_evmi->settle_time.tv.nsec = delay * NSEC_PER_USEC; + + return strnlen(buf, PAGE_SIZE); +} + +static ssize_t show_poll_time(struct device *dev, struct device_attribute *attr, char *buf) +{ + if (!gpio_evmi) + return -ENODEV; + + return snprintf(buf, PAGE_SIZE, "%ld\n", (gpio_evmi->poll_time.tv.nsec / NSEC_PER_MSEC)); +} + +static ssize_t store_poll_time(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + long int delay; + + if (!gpio_evmi) + return -ENODEV; + + sscanf(buf, "%ld", &delay); + gpio_evmi->poll_time.tv.nsec = delay * NSEC_PER_MSEC; + + return strnlen(buf, PAGE_SIZE); +} + +static ssize_t show_flags(struct device *dev, struct device_attribute *attr, char *buf) +{ + if (!gpio_evmi) + return -ENODEV; + + return snprintf(buf, PAGE_SIZE, "0x%x\n", gpio_evmi->flags); +} + +static ssize_t store_flags(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + unsigned flags; + + if (!gpio_evmi) + return -ENODEV; + + sscanf(buf, "0x%x", &flags); + gpio_evmi->flags = flags; + + return strnlen(buf, PAGE_SIZE); +} + +static DEVICE_ATTR(debounce_delay, (S_IRUGO | S_IWUGO), &show_debounce_delay, store_debounce_delay); +static DEVICE_ATTR(settle_time, (S_IRUGO | S_IWUGO), &show_settle_time, store_settle_time); +static DEVICE_ATTR(poll_time, (S_IRUGO | S_IWUGO), &show_poll_time, store_poll_time); +static DEVICE_ATTR(flags, (S_IRUGO | S_IWUGO), &show_flags, store_flags); + +static void debounce_release(struct device *dev) +{ +} + +static struct device debounce_device = { + .init_name = "debounce", + .release = debounce_release, +}; + static int __init debounce_init(void) { struct device *event_dev = NULL; struct gpio_event_platform_data *gpio_epd; struct gpio_event_info *gpio_ei; + int err = 0; printk(KERN_INFO PREFIX "Searching for " GPIO_EVENT_DEV_NAME "...\n"); - event_dev = device_find_child(&platform_bus, GPIO_EVENT_DEV_NAME, find_ms2_dev); if (event_dev == NULL) @@ -46,6 +166,16 @@ static int __init debounce_init(void) gpio_ei = (struct gpio_event_info*)gpio_epd->info[0]; gpio_evmi = container_of(gpio_ei, struct gpio_event_matrix_info, info); + err = device_register(&debounce_device); + if (err) { + return err; + } + + err = device_create_file(&debounce_device, &dev_attr_debounce_delay); + err = device_create_file(&debounce_device, &dev_attr_settle_time); + err = device_create_file(&debounce_device, &dev_attr_poll_time); + err = device_create_file(&debounce_device, &dev_attr_flags); + printk(KERN_INFO PREFIX "settle_time: %u\n", gpio_evmi->settle_time.tv.nsec); printk(KERN_INFO PREFIX "poll_time: %u\n", gpio_evmi->poll_time.tv.nsec); printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec); @@ -56,27 +186,10 @@ static int __init debounce_init(void) old_poll_time = gpio_evmi->poll_time; old_flags = gpio_evmi->flags; - if (gpio_evmi->debounce_delay.tv.nsec != debounce_delay * NSEC_PER_MSEC) { - printk(KERN_INFO PREFIX "Changing debounce_delay\n"); - gpio_evmi->debounce_delay.tv.nsec = debounce_delay * NSEC_PER_MSEC; - printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec); - } - + set_debounce_delay(debounce_delay); #if 0 gpio_evmi->flags &= ~GPIOKPF_REMOVE_SOME_PHANTOM_KEYS; #endif - - if (gpio_evmi->debounce_delay.tv.nsec != 0) { - /* GPIOKPF_DEBOUNCE should already be set by GPIOKPF_REMOVE_PHANTOM_KEYS */ - if (!(gpio_evmi->flags & GPIOKPF_DEBOUNCE)) { - printk(KERN_INFO PREFIX "Activating debounce\n"); - gpio_evmi->flags |= GPIOKPF_DEBOUNCE; - } - } else { - /* Deactivating GPIOKPF_DEBOUNCE */ - printk(KERN_INFO PREFIX "Deactivating debounce\n"); - gpio_evmi->flags &= ~GPIOKPF_DEBOUNCE; - } printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags); return 0; @@ -98,6 +211,11 @@ static void __exit debounce_exit(void) gpio_evmi->settle_time = old_settle_time; gpio_evmi->poll_time = old_poll_time; } + device_remove_file(&debounce_device, &dev_attr_debounce_delay); + device_remove_file(&debounce_device, &dev_attr_settle_time); + device_remove_file(&debounce_device, &dev_attr_poll_time); + device_remove_file(&debounce_device, &dev_attr_flags); + device_unregister(&debounce_device); } module_init(debounce_init); -- 2.39.5