X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/ms2-fixes/blobdiff_plain/a6322a6f9aac1788492a6a54b8880dc27fece842..308fc1a5e33464760d1f87b6cb3bff96b0ad3e5f:/debounce.c diff --git a/debounce.c b/debounce.c index 5694d12..0f45a4b 100644 --- a/debounce.c +++ b/debounce.c @@ -4,16 +4,15 @@ #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 ktime_t old_debounce_delay; +static ktime_t old_settle_time; +static ktime_t old_poll_time; static struct gpio_event_matrix_info *gpio_evmi = NULL; +static int hw_debounce = 0; +static int hw_debounce_time = 0; static int find_ms2_dev(struct device *dev, void *data) { @@ -24,6 +23,29 @@ static int find_ms2_dev(struct device *dev, void *data) return 0; } +/* hardware debounce: (time + 1) * 31us */ +static void hw_debounce_set(int enable, int time) { + int i; + + if (gpio_evmi == NULL) + return; + + for (i = 0; i < gpio_evmi->ninputs; i++) { + int gpio = gpio_evmi->input_gpios[i]; + + if ((time != -1) && (time != hw_debounce_time) && hw_debounce) { + printk(KERN_INFO PREFIX "Setting hardware debounce time for GPIO %d to %d (%dus)\n", gpio, time, (time+1)*31); + omap_set_gpio_debounce_time(gpio, time); + } + + if ((enable != -1) && (enable != hw_debounce)) { + printk(KERN_INFO PREFIX "%sabling hardware debounce for GPIO %d\n", (enable?"En":"Dis"), gpio); + omap_set_gpio_debounce(gpio, enable); + } + } +} + + static ssize_t show_debounce_delay(struct device *dev, struct device_attribute *attr, char *buf) { if (!gpio_evmi) @@ -316,6 +338,49 @@ static ssize_t store_drive_inactive_flag(struct device *dev, struct device_attri return count; } +static ssize_t show_hw_debounce(struct device *dev, struct device_attribute *attr, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%d\n", hw_debounce); +} + +static ssize_t store_hw_debounce(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + int enable; + + sscanf(buf, "%d", &enable); + + if (enable) { + hw_debounce_set(1, -1); + hw_debounce = 1; + } + else { + hw_debounce_set(0, -1); + hw_debounce = 0; + } + + return count; +} + +static ssize_t show_hw_debounce_time(struct device *dev, struct device_attribute *attr, char *buf) +{ + return snprintf(buf, PAGE_SIZE, "%d\n", hw_debounce_time); +} + +static ssize_t store_hw_debounce_time(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) +{ + int time; + + sscanf(buf, "%d", &time); + + if ((time < 0) || (time > 0xff)) + return count; + + hw_debounce_set(-1, time); + hw_debounce_time = time; + + 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); @@ -327,6 +392,8 @@ static DEVICE_ATTR(print_mapped_keys_flag, (S_IRUGO | S_IWUGO), show_print_mappe 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 DEVICE_ATTR(hw_debounce, (S_IRUGO | S_IWUGO), show_hw_debounce, store_hw_debounce); +static DEVICE_ATTR(hw_debounce_time, (S_IRUGO | S_IWUGO), show_hw_debounce_time, store_hw_debounce_time); static void debounce_release(struct device *dev) { @@ -337,24 +404,6 @@ static struct device debounce_device = { .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) { struct device *event_dev = NULL; @@ -381,8 +430,6 @@ static int __init debounce_init(void) 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); @@ -394,6 +441,8 @@ static int __init debounce_init(void) 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); + err = device_create_file(&debounce_device, &dev_attr_hw_debounce); + err = device_create_file(&debounce_device, &dev_attr_hw_debounce_time); 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); @@ -426,7 +475,7 @@ static void __exit debounce_exit(void) gpio_evmi->settle_time = old_settle_time; gpio_evmi->poll_time = old_poll_time; } - hw_debounce(0); + hw_debounce_set(0, 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); @@ -438,6 +487,8 @@ static void __exit debounce_exit(void) 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_remove_file(&debounce_device, &dev_attr_hw_debounce); + device_remove_file(&debounce_device, &dev_attr_hw_debounce_time); device_unregister(&debounce_device); }