Lines Matching +full:long +full:- +full:press +full:- +full:ms

1 // SPDX-License-Identifier: GPL-2.0-or-later
6  * Maintainer: René Moll <linux@r-moll.nl>
8  * ----------------------------------------
9  * - Description
10  * ----------------------------------------
18  * ----------------------------------------
19  * - GPIO
20  * ----------------------------------------
23  * - trigger (input)
24  *     A level change indicates the shut-down trigger. If it's state reverts
25  *     within the time-out defined by trigger_delay, the shut down is not
30  * - watchdog (output)
34  * - kill (output)
38  * ----------------------------------------
39  * - Interrupts
40  * ----------------------------------------
42  * The driver requires a non-shared, edge-triggered interrupt on the trigger
87  * ltc2952_poweroff_timer_wde - Timer callback
100 	if (data->kernel_panic)
103 	state = gpiod_get_value(data->gpio_watchdog);
104 	gpiod_set_value(data->gpio_watchdog, !state);
106 	hrtimer_forward_now(timer, data->wde_interval);
113 	hrtimer_start(&data->timer_wde, data->wde_interval, HRTIMER_MODE_REL);
122 	dev_info(data->dev, "executing shutdown\n");
129  * ltc2952_poweroff_handler - Interrupt handler
131  * time-out (timer_trigger). Once the time-out is actually reached the shut
141 	if (data->kernel_panic || hrtimer_active(&data->timer_wde)) {
146 	if (gpiod_get_value(data->gpio_trigger)) {
147 		hrtimer_start(&data->timer_trigger, data->trigger_delay,
150 		hrtimer_cancel(&data->timer_trigger);
157 	gpiod_set_value(ltc2952_data->gpio_kill, 1);
162 	data->wde_interval = 300L * NSEC_PER_MSEC;
163 	data->trigger_delay = ktime_set(2, 500L * NSEC_PER_MSEC);
165 	hrtimer_setup(&data->timer_trigger, ltc2952_poweroff_timer_trigger, CLOCK_MONOTONIC,
168 	hrtimer_setup(&data->timer_wde, ltc2952_poweroff_timer_wde, CLOCK_MONOTONIC,
180 	if (!device_property_read_u32(&pdev->dev, "trigger-delay-ms",
182 		data->trigger_delay = ktime_set(trigger_delay_ms / MSEC_PER_SEC,
186 	data->gpio_watchdog = devm_gpiod_get(&pdev->dev, "watchdog",
188 	if (IS_ERR(data->gpio_watchdog)) {
189 		ret = PTR_ERR(data->gpio_watchdog);
190 		dev_err(&pdev->dev, "unable to claim gpio \"watchdog\"\n");
194 	data->gpio_kill = devm_gpiod_get(&pdev->dev, "kill", GPIOD_OUT_LOW);
195 	if (IS_ERR(data->gpio_kill)) {
196 		ret = PTR_ERR(data->gpio_kill);
197 		dev_err(&pdev->dev, "unable to claim gpio \"kill\"\n");
201 	data->gpio_trigger = devm_gpiod_get_optional(&pdev->dev, "trigger",
203 	if (IS_ERR(data->gpio_trigger)) {
209 		dev_err(&pdev->dev, "unable to claim gpio \"trigger\"\n");
210 		data->gpio_trigger = NULL;
213 	if (devm_request_irq(&pdev->dev, gpiod_to_irq(data->gpio_trigger),
216 			     "ltc2952-poweroff",
220 		 * - No trigger input was defined
221 		 * - Claiming the GPIO failed
222 		 * - We could not map to an IRQ
223 		 * - We couldn't register an interrupt handler
229 		 * detects a button press for long enough, it will still start
233 		if (data->gpio_trigger) {
234 			dev_warn(&pdev->dev,
236 			devm_gpiod_put(&pdev->dev, data->gpio_trigger);
237 			data->gpio_trigger = NULL;
239 		dev_info(&pdev->dev,
248 					 unsigned long code, void *unused)
252 	data->kernel_panic = true;
262 		dev_err(&pdev->dev, "pm_power_off already registered");
263 		return -EBUSY;
266 	data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
268 		return -ENOMEM;
270 	data->dev = &pdev->dev;
281 	data->panic_notifier.notifier_call = ltc2952_poweroff_notify_panic;
283 				       &data->panic_notifier);
284 	dev_info(&pdev->dev, "probe successful\n");
294 	hrtimer_cancel(&data->timer_trigger);
295 	hrtimer_cancel(&data->timer_wde);
297 					 &data->panic_notifier);
310 		.name = "ltc2952-poweroff",
318 MODULE_DESCRIPTION("LTC PowerPath power-off driver");