X-Git-Url: http://cvs.zerfleddert.de/cgi-bin/gitweb.cgi/ms2-fixes/blobdiff_plain/b422e3333d93d3e54f65e0837af55ede54d73247..a6322a6f9aac1788492a6a54b8880dc27fece842:/debounce.c?ds=sidebyside diff --git a/debounce.c b/debounce.c index 8e13520..5694d12 100644 --- a/debounce.c +++ b/debounce.c @@ -1,13 +1,444 @@ #include +#include +#include +#include +#include + +/* hardware debounce: (value + 1) * 31us */ +#define GPIO_DEBOUNCE_TIME 0x1 + +#define PREFIX "debounce: " + +static unsigned old_flags = 0; +ktime_t old_debounce_delay; +ktime_t old_settle_time; +ktime_t old_poll_time; +static struct gpio_event_matrix_info *gpio_evmi = NULL; + +static int find_ms2_dev(struct device *dev, void *data) +{ + if (!strncmp((char*)data, dev_name(dev), strlen((char*)data))) { + printk(KERN_INFO PREFIX "Found it\n"); + return 1; + } + 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; + printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec); + } + +#if 0 + 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; + } + } +#endif +} + +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 count; +} + +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 count; +} + +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 count; +} + +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); + + printk(KERN_INFO PREFIX "flags: 0x%x\n", flags); + + gpio_evmi->flags = flags; + + return count; +} + +static ssize_t show_debounce_flag(struct device *dev, struct device_attribute *attr, char *buf) +{ + if (!gpio_evmi) + return -ENODEV; + + return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_DEBOUNCE) ? 1 : 0); +} + +static ssize_t store_debounce_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + unsigned flag; + + if (!gpio_evmi) + return -ENODEV; + + sscanf(buf, "%u", &flag); + + if (flag) { + gpio_evmi->flags |= GPIOKPF_DEBOUNCE; + } else { + gpio_evmi->flags &= ~GPIOKPF_DEBOUNCE; + } + + return count; +} + +static ssize_t show_remove_some_phantom_keys_flag(struct device *dev, struct device_attribute *attr, char *buf) +{ + if (!gpio_evmi) + return -ENODEV; + + return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_REMOVE_SOME_PHANTOM_KEYS) ? 1 : 0); +} + +static ssize_t store_remove_some_phantom_keys_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + unsigned flag; + + if (!gpio_evmi) + return -ENODEV; + + sscanf(buf, "%u", &flag); + + if (flag) { + gpio_evmi->flags |= GPIOKPF_REMOVE_SOME_PHANTOM_KEYS; + } else { + gpio_evmi->flags &= ~GPIOKPF_REMOVE_SOME_PHANTOM_KEYS; + } + + return count; +} + +static ssize_t show_print_unmapped_keys_flag(struct device *dev, struct device_attribute *attr, char *buf) +{ + if (!gpio_evmi) + return -ENODEV; + + return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_PRINT_UNMAPPED_KEYS) ? 1 : 0); +} + +static ssize_t store_print_unmapped_keys_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + unsigned flag; + + if (!gpio_evmi) + return -ENODEV; + + sscanf(buf, "%u", &flag); + + if (flag) { + gpio_evmi->flags |= GPIOKPF_PRINT_UNMAPPED_KEYS; + } else { + gpio_evmi->flags &= ~GPIOKPF_PRINT_UNMAPPED_KEYS; + } + + return count; +} + +static ssize_t show_print_mapped_keys_flag(struct device *dev, struct device_attribute *attr, char *buf) +{ + if (!gpio_evmi) + return -ENODEV; + + return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_PRINT_MAPPED_KEYS) ? 1 : 0); +} + +static ssize_t store_print_mapped_keys_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + unsigned flag; + + if (!gpio_evmi) + return -ENODEV; + + sscanf(buf, "%u", &flag); + + if (flag) { + gpio_evmi->flags |= GPIOKPF_PRINT_MAPPED_KEYS; + } else { + gpio_evmi->flags &= ~GPIOKPF_PRINT_MAPPED_KEYS; + } + + return count; +} + +static ssize_t show_print_phantom_keys_flag(struct device *dev, struct device_attribute *attr, char *buf) +{ + if (!gpio_evmi) + return -ENODEV; + + return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_PRINT_PHANTOM_KEYS) ? 1 : 0); +} + +static ssize_t store_print_phantom_keys_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + unsigned flag; + + if (!gpio_evmi) + return -ENODEV; + + sscanf(buf, "%u", &flag); + + if (flag) { + gpio_evmi->flags |= GPIOKPF_PRINT_PHANTOM_KEYS; + } else { + gpio_evmi->flags &= ~GPIOKPF_PRINT_PHANTOM_KEYS; + } + + return count; +} + +static ssize_t show_active_high_flag(struct device *dev, struct device_attribute *attr, char *buf) +{ + if (!gpio_evmi) + return -ENODEV; + + return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_ACTIVE_HIGH) ? 1 : 0); +} + +static ssize_t store_active_high_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + unsigned flag; + + if (!gpio_evmi) + return -ENODEV; + + sscanf(buf, "%u", &flag); + + if (flag) { + gpio_evmi->flags |= GPIOKPF_ACTIVE_HIGH; + } else { + gpio_evmi->flags &= ~GPIOKPF_ACTIVE_HIGH; + } + + return count; +} + +static ssize_t show_drive_inactive_flag(struct device *dev, struct device_attribute *attr, char *buf) +{ + if (!gpio_evmi) + return -ENODEV; + + return snprintf(buf, PAGE_SIZE, "%u\n", (gpio_evmi->flags & GPIOKPF_DRIVE_INACTIVE) ? 1 : 0); +} + +static ssize_t store_drive_inactive_flag(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + unsigned flag; + + if (!gpio_evmi) + return -ENODEV; + + sscanf(buf, "%u", &flag); + + if (flag) { + gpio_evmi->flags |= GPIOKPF_DRIVE_INACTIVE; + } else { + gpio_evmi->flags &= ~GPIOKPF_DRIVE_INACTIVE; + } + + return count; +} + +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), show_flags, store_flags); +static DEVICE_ATTR(debounce_flag, (S_IRUGO | S_IWUGO), show_debounce_flag, store_debounce_flag); +static DEVICE_ATTR(remove_some_phantom_keys_flag, (S_IRUGO | S_IWUGO), show_remove_some_phantom_keys_flag, store_remove_some_phantom_keys_flag); +static DEVICE_ATTR(print_unmapped_keys_flag, (S_IRUGO | S_IWUGO), show_print_unmapped_keys_flag, store_print_unmapped_keys_flag); +static DEVICE_ATTR(print_mapped_keys_flag, (S_IRUGO | S_IWUGO), show_print_mapped_keys_flag, store_print_mapped_keys_flag); +static DEVICE_ATTR(print_phantom_keys_flag, (S_IRUGO | S_IWUGO), show_print_phantom_keys_flag, store_print_phantom_keys_flag); +static DEVICE_ATTR(active_high_flag, (S_IRUGO), show_active_high_flag, store_active_high_flag); +static DEVICE_ATTR(drive_inactive_flag, (S_IRUGO | S_IWUGO), show_drive_inactive_flag, store_drive_inactive_flag); + +static void debounce_release(struct device *dev) +{ +} + +static struct device debounce_device = { + .init_name = "debounce", + .release = debounce_release, +}; + +static void hw_debounce_pin(int gpio, int enable) { + printk(KERN_INFO PREFIX "%sabling hardware debounce for GPIO %d\n", (enable?"En":"Dis"), gpio); + if (enable) + omap_set_gpio_debounce_time(gpio, GPIO_DEBOUNCE_TIME); + omap_set_gpio_debounce(gpio, enable); +} + +static void hw_debounce(int enable) { + int i; + + if (gpio_evmi == NULL) + return; + + for (i = 0; i < gpio_evmi->ninputs; i++) { + hw_debounce_pin(gpio_evmi->input_gpios[i], enable); + } +} static int __init debounce_init(void) { - printk(KERN_INFO "Hello Milestone2!\n"); + 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) + return -ENODEV; + + gpio_epd = (struct gpio_event_platform_data*)event_dev->platform_data; + printk(KERN_INFO PREFIX "And there is a %s connected...\n", gpio_epd->name); + if (strcmp(gpio_epd->name, "sholes-keypad")) + return -ENODEV; + + 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; + } + + hw_debounce(1); + + 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); + err = device_create_file(&debounce_device, &dev_attr_debounce_flag); + err = device_create_file(&debounce_device, &dev_attr_remove_some_phantom_keys_flag); + err = device_create_file(&debounce_device, &dev_attr_print_unmapped_keys_flag); + err = device_create_file(&debounce_device, &dev_attr_print_mapped_keys_flag); + err = device_create_file(&debounce_device, &dev_attr_print_phantom_keys_flag); + err = device_create_file(&debounce_device, &dev_attr_active_high_flag); + err = device_create_file(&debounce_device, &dev_attr_drive_inactive_flag); + + 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); + printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags); + + old_debounce_delay = gpio_evmi->debounce_delay; + old_settle_time = gpio_evmi->settle_time; + old_poll_time = gpio_evmi->poll_time; + old_flags = gpio_evmi->flags; + + printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags); + return 0; } static void __exit debounce_exit(void) { + if (gpio_evmi) { + if (gpio_evmi->debounce_delay.tv.nsec != old_debounce_delay.tv.nsec) { + printk(KERN_INFO PREFIX "Restoring debounce_delay\n"); + gpio_evmi->debounce_delay = old_debounce_delay; + printk(KERN_INFO PREFIX "debounce_delay: %u\n", gpio_evmi->debounce_delay.tv.nsec); + } + if (gpio_evmi->flags != old_flags) { + printk(KERN_INFO PREFIX "Restoring flags\n"); + gpio_evmi->flags = old_flags; + printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags); + } + gpio_evmi->settle_time = old_settle_time; + gpio_evmi->poll_time = old_poll_time; + } + hw_debounce(0); + 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_remove_file(&debounce_device, &dev_attr_debounce_flag); + device_remove_file(&debounce_device, &dev_attr_remove_some_phantom_keys_flag); + device_remove_file(&debounce_device, &dev_attr_print_unmapped_keys_flag); + device_remove_file(&debounce_device, &dev_attr_print_mapped_keys_flag); + device_remove_file(&debounce_device, &dev_attr_print_phantom_keys_flag); + device_remove_file(&debounce_device, &dev_attr_active_high_flag); + device_remove_file(&debounce_device, &dev_attr_drive_inactive_flag); + device_unregister(&debounce_device); } module_init(debounce_init);