3  * pps-gpio.c -- PPS client driver using GPIO
9 #define PPS_GPIO_NAME "pps-gpio"
19 #include <linux/pps-gpio.h>
29 	int irq;			/* IRQ used as PPS source */
30 	struct pps_device *pps;		/* PPS source device */  member
31 	struct pps_source_info info;	/* PPS source information */
37 	unsigned int echo_active_ms;	/* PPS echo active duration */
42  * Report the PPS event
59 		pps_event(info->pps, &ts, PPS_CAPTUREASSERT, data);  in pps_gpio_irq_handler()
63 		pps_event(info->pps, &ts, PPS_CAPTURECLEAR, data);  in pps_gpio_irq_handler()
69 static void pps_gpio_echo(struct pps_device *pps, int event, void *data)  in pps_gpio_echo()  argument
76 		if (pps->params.mode & PPS_ECHOASSERT)  in pps_gpio_echo()
81 		if (pps->params.mode & PPS_ECHOCLEAR)  in pps_gpio_echo()
87 	if (info->pps->params.mode & (PPS_ECHOASSERT | PPS_ECHOCLEAR)) {  in pps_gpio_echo()
115 			"failed to request PPS GPIO\n");  in pps_gpio_setup()
200 	/* initialize PPS specific parts of the bookkeeping data structure. */  in pps_gpio_probe()
215 	/* register PPS source */  in pps_gpio_probe()
219 	data->pps = pps_register_source(&data->info, pps_default_params);  in pps_gpio_probe()
220 	if (IS_ERR(data->pps)) {  in pps_gpio_probe()
221 		dev_err(&pdev->dev, "failed to register IRQ %d as PPS source\n",  in pps_gpio_probe()
223 		return PTR_ERR(data->pps);  in pps_gpio_probe()
230 		pps_unregister_source(data->pps);  in pps_gpio_probe()
235 	dev_info(data->pps->dev, "Registered IRQ %d as PPS source\n",  in pps_gpio_probe()
245 	pps_unregister_source(data->pps);  in pps_gpio_remove()
251 	dev_info(&pdev->dev, "removed IRQ %d as PPS source\n", data->irq);  in pps_gpio_remove()
256 	{ .compatible = "pps-gpio", },
273 MODULE_DESCRIPTION("Use GPIO pin as PPS source");