3  * pps-gpio.c -- PPS client driver using GPIO
9 #define PPS_GPIO_NAME "pps-gpio"
28 	int irq;			/* IRQ used as PPS source */
29 	struct pps_device *pps;		/* PPS source device */  member
30 	struct pps_source_info info;	/* PPS source information */
36 	unsigned int echo_active_ms;	/* PPS echo active duration */
41  * Report the PPS event
58 		pps_event(info->pps, &ts, PPS_CAPTUREASSERT, data);  in pps_gpio_irq_handler()
62 		pps_event(info->pps, &ts, PPS_CAPTURECLEAR, data);  in pps_gpio_irq_handler()
68 static void pps_gpio_echo(struct pps_device *pps, int event, void *data)  in pps_gpio_echo()  argument
75 		if (pps->params.mode & PPS_ECHOASSERT)  in pps_gpio_echo()
80 		if (pps->params.mode & PPS_ECHOCLEAR)  in pps_gpio_echo()
86 	if (info->pps->params.mode & (PPS_ECHOASSERT | PPS_ECHOCLEAR)) {  in pps_gpio_echo()
111 				     "failed to request PPS GPIO\n");  in pps_gpio_setup()
182 	/* initialize PPS specific parts of the bookkeeping data structure. */  in pps_gpio_probe()
197 	/* register PPS source */  in pps_gpio_probe()
201 	data->pps = pps_register_source(&data->info, pps_default_params);  in pps_gpio_probe()
202 	if (IS_ERR(data->pps)) {  in pps_gpio_probe()
203 		dev_err(dev, "failed to register IRQ %d as PPS source\n",  in pps_gpio_probe()
205 		return PTR_ERR(data->pps);  in pps_gpio_probe()
212 		pps_unregister_source(data->pps);  in pps_gpio_probe()
217 	dev_info(data->pps->dev, "Registered IRQ %d as PPS source\n",  in pps_gpio_probe()
227 	pps_unregister_source(data->pps);  in pps_gpio_remove()
231 	dev_info(&pdev->dev, "removed IRQ %d as PPS source\n", data->irq);  in pps_gpio_remove()
235 	{ .compatible = "pps-gpio", },
252 MODULE_DESCRIPTION("Use GPIO pin as PPS source");