1 // SPDX-License-Identifier: GPL-2.0
17 #define INTERRUPT_CNT_NAME "interrupt-cnt"
35 	atomic_long_inc(&priv->count);  in interrupt_cnt_isr()
47 	guard(mutex)(&priv->lock);  in interrupt_cnt_enable_read()
49 	*enable = priv->enabled;  in interrupt_cnt_enable_read()
59 	guard(mutex)(&priv->lock);  in interrupt_cnt_enable_write()
61 	if (priv->enabled == enable)  in interrupt_cnt_enable_write()
65 		priv->enabled = true;  in interrupt_cnt_enable_write()
66 		enable_irq(priv->irq);  in interrupt_cnt_enable_write()
68 		disable_irq(priv->irq);  in interrupt_cnt_enable_write()
69 		priv->enabled = false;  in interrupt_cnt_enable_write()
99 	*val = atomic_long_read(&priv->count);  in interrupt_cnt_read()
109 	if (val != (typeof(priv->count.counter))val)  in interrupt_cnt_write()
110 		return -ERANGE;  in interrupt_cnt_write()
112 	atomic_long_set(&priv->count, val);  in interrupt_cnt_write()
131 				     struct counter_signal *signal,  in interrupt_cnt_signal_read()  argument
137 	if (!priv->gpio)  in interrupt_cnt_signal_read()
138 		return -EINVAL;  in interrupt_cnt_signal_read()
140 	ret = gpiod_get_value(priv->gpio);  in interrupt_cnt_signal_read()
152 	if (watch->channel != 0 ||  in interrupt_cnt_watch_validate()
153 	    watch->event != COUNTER_EVENT_CHANGE_OF_STATE)  in interrupt_cnt_watch_validate()
154 		return -EINVAL;  in interrupt_cnt_watch_validate()
170 	struct device *dev = &pdev->dev;  in interrupt_cnt_probe()
177 		return -ENOMEM;  in interrupt_cnt_probe()
180 	priv->irq = platform_get_irq_optional(pdev,  0);  in interrupt_cnt_probe()
181 	if (priv->irq == -ENXIO)  in interrupt_cnt_probe()
182 		priv->irq = 0;  in interrupt_cnt_probe()
183 	else if (priv->irq < 0)  in interrupt_cnt_probe()
184 		return dev_err_probe(dev, priv->irq, "failed to get IRQ\n");  in interrupt_cnt_probe()
186 	priv->gpio = devm_gpiod_get_optional(dev, NULL, GPIOD_IN);  in interrupt_cnt_probe()
187 	if (IS_ERR(priv->gpio))  in interrupt_cnt_probe()
188 		return dev_err_probe(dev, PTR_ERR(priv->gpio), "failed to get GPIO\n");  in interrupt_cnt_probe()
190 	if (!priv->irq && !priv->gpio) {  in interrupt_cnt_probe()
192 		return -ENODEV;  in interrupt_cnt_probe()
195 	if (!priv->irq) {  in interrupt_cnt_probe()
196 		int irq = gpiod_to_irq(priv->gpio);  in interrupt_cnt_probe()
201 		priv->irq = irq;  in interrupt_cnt_probe()
204 	priv->signals.name = devm_kasprintf(dev, GFP_KERNEL, "IRQ %d",  in interrupt_cnt_probe()
205 					    priv->irq);  in interrupt_cnt_probe()
206 	if (!priv->signals.name)  in interrupt_cnt_probe()
207 		return -ENOMEM;  in interrupt_cnt_probe()
209 	counter->signals = &priv->signals;  in interrupt_cnt_probe()
210 	counter->num_signals = 1;  in interrupt_cnt_probe()
212 	priv->synapses.actions_list = interrupt_cnt_synapse_actions;  in interrupt_cnt_probe()
213 	priv->synapses.num_actions = ARRAY_SIZE(interrupt_cnt_synapse_actions);  in interrupt_cnt_probe()
214 	priv->synapses.signal = &priv->signals;  in interrupt_cnt_probe()
216 	priv->cnts.name = "Channel 0 Count";  in interrupt_cnt_probe()
217 	priv->cnts.functions_list = interrupt_cnt_functions;  in interrupt_cnt_probe()
218 	priv->cnts.num_functions = ARRAY_SIZE(interrupt_cnt_functions);  in interrupt_cnt_probe()
219 	priv->cnts.synapses = &priv->synapses;  in interrupt_cnt_probe()
220 	priv->cnts.num_synapses = 1;  in interrupt_cnt_probe()
221 	priv->cnts.ext = interrupt_cnt_ext;  in interrupt_cnt_probe()
222 	priv->cnts.num_ext = ARRAY_SIZE(interrupt_cnt_ext);  in interrupt_cnt_probe()
224 	counter->name = dev_name(dev);  in interrupt_cnt_probe()
225 	counter->parent = dev;  in interrupt_cnt_probe()
226 	counter->ops = &interrupt_cnt_ops;  in interrupt_cnt_probe()
227 	counter->counts = &priv->cnts;  in interrupt_cnt_probe()
228 	counter->num_counts = 1;  in interrupt_cnt_probe()
230 	irq_set_status_flags(priv->irq, IRQ_NOAUTOEN);  in interrupt_cnt_probe()
231 	ret = devm_request_irq(dev, priv->irq, interrupt_cnt_isr,  in interrupt_cnt_probe()
237 	mutex_init(&priv->lock);  in interrupt_cnt_probe()
247 	{ .compatible = "interrupt-counter", },
261 MODULE_ALIAS("platform:interrupt-counter");