diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c index 8a89f6e7715d..fc080bf1c4d2 100644 --- a/drivers/tty/vt/keyboard.c +++ b/drivers/tty/vt/keyboard.c @@ -33,6 +33,7 @@ #include #include #include +#include #include #include @@ -961,6 +962,110 @@ static void k_brl(struct vc_data *vc, unsigned char value, char up_flag) } } +#if IS_ENABLED(CONFIG_INPUT_LEDS) && IS_ENABLED(CONFIG_LEDS_TRIGGERS) + +struct kbd_led_trigger { + struct led_trigger trigger; + unsigned int mask; +}; + +static void kbd_led_trigger_activate(struct led_classdev *cdev) +{ + struct kbd_led_trigger *trigger = + container_of(cdev->trigger, struct kbd_led_trigger, trigger); + + tasklet_disable(&keyboard_tasklet); + if (ledstate != 0xff) + led_trigger_event(&trigger->trigger, + ledstate & trigger->mask ? + LED_FULL : LED_OFF); + tasklet_enable(&keyboard_tasklet); +} + +#define KBD_LED_TRIGGER(_led_bit, _name) { \ + .trigger = { \ + .name = _name, \ + .activate = kbd_led_trigger_activate, \ + }, \ + .mask = BIT(_led_bit), \ + } + +static struct kbd_led_trigger kbd_led_triggers[] = { + KBD_LED_TRIGGER(VC_SCROLLOCK, "kbd-scrollock"), + KBD_LED_TRIGGER(VC_NUMLOCK, "kbd-numlock"), + KBD_LED_TRIGGER(VC_CAPSLOCK, "kbd-capslock"), + KBD_LED_TRIGGER(VC_KANALOCK, "kbd-kanalock"), +}; + +static void kbd_propagate_led_state(unsigned int old_state, + unsigned int new_state) +{ + struct kbd_led_trigger *trigger; + unsigned int changed = old_state ^ new_state; + int i; + + for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); i++) { + trigger = &kbd_led_triggers[i]; + + if (changed & trigger->mask) + led_trigger_event(&trigger->trigger, + new_state & trigger->mask ? + LED_FULL : LED_OFF); + } +} + +static int kbd_update_leds_helper(struct input_handle *handle, void *data) +{ + unsigned int led_state = *(unsigned int *)data; + + if (test_bit(EV_LED, handle->dev->evbit)) + kbd_propagate_led_state(~led_state, led_state); + + return 0; +} + +static void kbd_init_leds(void) +{ + int error; + int i; + + for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); i++) { + error = led_trigger_register(&kbd_led_triggers[i].trigger); + if (error) + pr_err("error %d while registering trigger %s\n", + error, kbd_led_triggers[i].trigger.name); + } +} + +#else + +static int kbd_update_leds_helper(struct input_handle *handle, void *data) +{ + unsigned int leds = *(unsigned int *)data; + + if (test_bit(EV_LED, handle->dev->evbit)) { + input_inject_event(handle, EV_LED, LED_SCROLLL, !!(leds & 0x01)); + input_inject_event(handle, EV_LED, LED_NUML, !!(leds & 0x02)); + input_inject_event(handle, EV_LED, LED_CAPSL, !!(leds & 0x04)); + input_inject_event(handle, EV_SYN, SYN_REPORT, 0); + } + + return 0; +} + +static void kbd_propagate_led_state(unsigned int old_state, + unsigned int new_state) +{ + input_handler_for_each_handle(&kbd_handler, &new_state, + kbd_update_leds_helper); +} + +static void kbd_init_leds(void) +{ +} + +#endif + /* * The leds display either (i) the status of NumLock, CapsLock, ScrollLock, * or (ii) whatever pattern of lights people want to show using KDSETLED, @@ -995,20 +1100,6 @@ static inline unsigned char getleds(void) return kb->ledflagstate; } -static int kbd_update_leds_helper(struct input_handle *handle, void *data) -{ - unsigned char leds = *(unsigned char *)data; - - if (test_bit(EV_LED, handle->dev->evbit)) { - input_inject_event(handle, EV_LED, LED_SCROLLL, !!(leds & 0x01)); - input_inject_event(handle, EV_LED, LED_NUML, !!(leds & 0x02)); - input_inject_event(handle, EV_LED, LED_CAPSL, !!(leds & 0x04)); - input_inject_event(handle, EV_SYN, SYN_REPORT, 0); - } - - return 0; -} - /** * vt_get_leds - helper for braille console * @console: console to read @@ -1085,24 +1176,22 @@ void vt_kbd_con_stop(int console) } /* - * This is the tasklet that updates LED state on all keyboards - * attached to the box. The reason we use tasklet is that we - * need to handle the scenario when keyboard handler is not - * registered yet but we already getting updates from the VT to - * update led state. + * This is the tasklet that updates LED state of LEDs using standard + * keyboard triggers. The reason we use tasklet is that we need to + * handle the scenario when keyboard handler is not registered yet + * but we already getting updates from the VT to update led state. */ static void kbd_bh(unsigned long dummy) { unsigned char leds; unsigned long flags; - + spin_lock_irqsave(&led_lock, flags); leds = getleds(); spin_unlock_irqrestore(&led_lock, flags); if (leds != ledstate) { - input_handler_for_each_handle(&kbd_handler, &leds, - kbd_update_leds_helper); + kbd_propagate_led_state(ledstate, leds); ledstate = leds; } } @@ -1450,8 +1539,10 @@ static void kbd_start(struct input_handle *handle) { tasklet_disable(&keyboard_tasklet); - if (ledstate != 0xff) - kbd_update_leds_helper(handle, &ledstate); + if (ledstate != 0xff) { + unsigned int state = ledstate; + kbd_update_leds_helper(handle, &state); + } tasklet_enable(&keyboard_tasklet); } @@ -1497,6 +1588,8 @@ int __init kbd_init(void) kbd_table[i].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE; } + kbd_init_leds(); + error = input_register_handler(&kbd_handler); if (error) return error;