1 // SPDX-License-Identifier: GPL-2.0
9 #include <linux/irq.h>
15 #define INTERRUPT_CNT_NAME "interrupt-cnt"
20 	int irq;  member
22 	struct counter_signal signals;  member
27 static irqreturn_t interrupt_cnt_isr(int irq, void *dev_id)  in interrupt_cnt_isr()  argument
32 	atomic_inc(&priv->count);  in interrupt_cnt_isr()
44 	*enable = priv->enabled;  in interrupt_cnt_enable_read()
54 	if (priv->enabled == enable)  in interrupt_cnt_enable_write()
58 		priv->enabled = true;  in interrupt_cnt_enable_write()
59 		enable_irq(priv->irq);  in interrupt_cnt_enable_write()
61 		disable_irq(priv->irq);  in interrupt_cnt_enable_write()
62 		priv->enabled = false;  in interrupt_cnt_enable_write()
92 	*val = atomic_read(&priv->count);  in interrupt_cnt_read()
102 	if (val != (typeof(priv->count.counter))val)  in interrupt_cnt_write()
103 		return -ERANGE;  in interrupt_cnt_write()
105 	atomic_set(&priv->count, val);  in interrupt_cnt_write()
130 	if (!priv->gpio)  in interrupt_cnt_signal_read()
131 		return -EINVAL;  in interrupt_cnt_signal_read()
133 	ret = gpiod_get_value(priv->gpio);  in interrupt_cnt_signal_read()
145 	if (watch->channel != 0 ||  in interrupt_cnt_watch_validate()
146 	    watch->event != COUNTER_EVENT_CHANGE_OF_STATE)  in interrupt_cnt_watch_validate()
147 		return -EINVAL;  in interrupt_cnt_watch_validate()
163 	struct device *dev = &pdev->dev;  in interrupt_cnt_probe()
170 		return -ENOMEM;  in interrupt_cnt_probe()
173 	priv->irq = platform_get_irq_optional(pdev,  0);  in interrupt_cnt_probe()
174 	if (priv->irq == -ENXIO)  in interrupt_cnt_probe()
175 		priv->irq = 0;  in interrupt_cnt_probe()
176 	else if (priv->irq < 0)  in interrupt_cnt_probe()
177 		return dev_err_probe(dev, priv->irq, "failed to get IRQ\n");  in interrupt_cnt_probe()
179 	priv->gpio = devm_gpiod_get_optional(dev, NULL, GPIOD_IN);  in interrupt_cnt_probe()
180 	if (IS_ERR(priv->gpio))  in interrupt_cnt_probe()
181 		return dev_err_probe(dev, PTR_ERR(priv->gpio), "failed to get GPIO\n");  in interrupt_cnt_probe()
183 	if (!priv->irq && !priv->gpio) {  in interrupt_cnt_probe()
184 		dev_err(dev, "IRQ and GPIO are not found. At least one source should be provided\n");  in interrupt_cnt_probe()
185 		return -ENODEV;  in interrupt_cnt_probe()
188 	if (!priv->irq) {  in interrupt_cnt_probe()
189 		int irq = gpiod_to_irq(priv->gpio);  in interrupt_cnt_probe()  local
191 		if (irq < 0)  in interrupt_cnt_probe()
192 			return dev_err_probe(dev, irq, "failed to get IRQ from GPIO\n");  in interrupt_cnt_probe()
194 		priv->irq = irq;  in interrupt_cnt_probe()
197 	priv->signals.name = devm_kasprintf(dev, GFP_KERNEL, "IRQ %d",  in interrupt_cnt_probe()
198 					    priv->irq);  in interrupt_cnt_probe()
199 	if (!priv->signals.name)  in interrupt_cnt_probe()
200 		return -ENOMEM;  in interrupt_cnt_probe()
202 	counter->signals = &priv->signals;  in interrupt_cnt_probe()
203 	counter->num_signals = 1;  in interrupt_cnt_probe()
205 	priv->synapses.actions_list = interrupt_cnt_synapse_actions;  in interrupt_cnt_probe()
206 	priv->synapses.num_actions = ARRAY_SIZE(interrupt_cnt_synapse_actions);  in interrupt_cnt_probe()
207 	priv->synapses.signal = &priv->signals;  in interrupt_cnt_probe()
209 	priv->cnts.name = "Channel 0 Count";  in interrupt_cnt_probe()
210 	priv->cnts.functions_list = interrupt_cnt_functions;  in interrupt_cnt_probe()
211 	priv->cnts.num_functions = ARRAY_SIZE(interrupt_cnt_functions);  in interrupt_cnt_probe()
212 	priv->cnts.synapses = &priv->synapses;  in interrupt_cnt_probe()
213 	priv->cnts.num_synapses = 1;  in interrupt_cnt_probe()
214 	priv->cnts.ext = interrupt_cnt_ext;  in interrupt_cnt_probe()
215 	priv->cnts.num_ext = ARRAY_SIZE(interrupt_cnt_ext);  in interrupt_cnt_probe()
217 	counter->name = dev_name(dev);  in interrupt_cnt_probe()
218 	counter->parent = dev;  in interrupt_cnt_probe()
219 	counter->ops = &interrupt_cnt_ops;  in interrupt_cnt_probe()
220 	counter->counts = &priv->cnts;  in interrupt_cnt_probe()
221 	counter->num_counts = 1;  in interrupt_cnt_probe()
223 	irq_set_status_flags(priv->irq, IRQ_NOAUTOEN);  in interrupt_cnt_probe()
224 	ret = devm_request_irq(dev, priv->irq, interrupt_cnt_isr,  in interrupt_cnt_probe()
238 	{ .compatible = "interrupt-counter", },
252 MODULE_ALIAS("platform:interrupt-counter");