From: Michael Gernoth Date: Tue, 6 Sep 2011 18:36:31 +0000 (+0200) Subject: add support for switching between edge and level triggered IRQs X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/ms2-fixes/commitdiff_plain/f42863015cde28c9102ffe5406419b73939aec7f add support for switching between edge and level triggered IRQs --- diff --git a/debounce.c b/debounce.c index e604016..9110598 100644 --- a/debounce.c +++ b/debounce.c @@ -2,6 +2,8 @@ #include #include #include +#include +#include #include #define PREFIX "debounce: " @@ -45,6 +47,42 @@ static void hw_debounce_set(int enable, int time) { } } +static void set_irq_types(void) { + int err; + unsigned int irq; + unsigned long type; + int i; + + if (gpio_evmi == NULL) + return; + + switch (gpio_evmi->flags & (GPIOKPF_ACTIVE_HIGH|GPIOKPF_LEVEL_TRIGGERED_IRQ)) { + default: + type = IRQ_TYPE_EDGE_FALLING; + break; + case GPIOKPF_ACTIVE_HIGH: + type = IRQ_TYPE_EDGE_RISING; + break; + case GPIOKPF_LEVEL_TRIGGERED_IRQ: + type = IRQ_TYPE_LEVEL_LOW; + break; + case GPIOKPF_LEVEL_TRIGGERED_IRQ | GPIOKPF_ACTIVE_HIGH: + type = IRQ_TYPE_LEVEL_HIGH; + break; + } + + printk(KERN_INFO PREFIX "Settinhg IRQ type to 0x%lx\n", type); + + for (i = 0; i < gpio_evmi->ninputs; i++) { + + err = irq = gpio_to_irq(gpio_evmi->input_gpios[i]); + + if (err < 0) + return; + + err = set_irq_type(irq, type); + } +} static ssize_t show_debounce_delay(struct device *dev, struct device_attribute *attr, char *buf) { @@ -309,6 +347,36 @@ static ssize_t store_active_high_flag(struct device *dev, struct device_attribut gpio_evmi->flags &= ~GPIOKPF_ACTIVE_HIGH; } + set_irq_types(); + + return count; +} + +static ssize_t show_level_triggered_irq_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_LEVEL_TRIGGERED_IRQ) ? 1 : 0); +} + +static ssize_t store_level_triggered_irq_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_LEVEL_TRIGGERED_IRQ; + } else { + gpio_evmi->flags &= ~GPIOKPF_LEVEL_TRIGGERED_IRQ; + } + + set_irq_types(); + return count; } @@ -396,6 +464,7 @@ static DEVICE_ATTR(print_unmapped_keys_flag, (S_IRUGO | S_IWUGO), show_print_unm 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(level_triggered_irq_flag, (S_IRUGO | S_IWUGO), show_level_triggered_irq_flag, store_level_triggered_irq_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); @@ -445,6 +514,7 @@ static int __init debounce_init(void) 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_level_triggered_irq_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); @@ -476,6 +546,7 @@ static void __exit debounce_exit(void) printk(KERN_INFO PREFIX "Restoring flags\n"); gpio_evmi->flags = old_flags; printk(KERN_INFO PREFIX "flags: 0x%x\n", gpio_evmi->flags); + set_irq_types(); } gpio_evmi->settle_time = old_settle_time; gpio_evmi->poll_time = old_poll_time; @@ -491,6 +562,7 @@ static void __exit debounce_exit(void) 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_level_triggered_irq_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);