1 // SPDX-License-Identifier: GPL-2.0-or-later
3  * pps_gen_parport.c -- kernel parallel port PPS signal generator
49 static int attached;  variable
78 	lim = NSEC_PER_SEC - send_delay - dev->port_write_time;  in hrtimer_event()
94 	port = dev->pardev->port;  in hrtimer_event()
95 	port->ops->write_control(port, SIGNAL);  in hrtimer_event()
98 	lim = NSEC_PER_SEC - dev->port_write_time;  in hrtimer_event()
104 	port->ops->write_control(port, NO_SIGNAL);  in hrtimer_event()
112 	dev->port_write_time =  in hrtimer_event()
113 		(dev->port_write_time + timespec64_to_ns(&dts)) >> 1;  in hrtimer_event()
132 				NSEC_PER_SEC - (send_delay +  in hrtimer_event()
133 				dev->port_write_time + SAFETY_INTERVAL +  in hrtimer_event()
143 	struct parport *port = dev->pardev->port;  in calibrate_port()
153 		port->ops->write_control(port, NO_SIGNAL);  in calibrate_port()
161 	dev->port_write_time = acc >> PORT_NTESTS_SHIFT;  in calibrate_port()
162 	pr_info("port write takes %ldns\n", dev->port_write_time);  in calibrate_port()
167 	struct timespec64 ts;  in next_intr_time()  local
169 	ktime_get_real_ts64(&ts);  in next_intr_time()
171 	return ktime_set(ts.tv_sec +  in next_intr_time()
172 			((ts.tv_nsec > 990 * NSEC_PER_MSEC) ? 1 : 0),  in next_intr_time()
173 			NSEC_PER_SEC - (send_delay +  in next_intr_time()
174 			dev->port_write_time + 3 * SAFETY_INTERVAL));  in next_intr_time()
186 	if (attached) {  in parport_attach()
197 		pr_err("couldn't register with %s\n", port->name);  in parport_attach()
202 		pr_err("couldn't claim %s\n", port->name);  in parport_attach()
206 	pr_info("attached to %s\n", port->name);  in parport_attach()
207 	attached = 1;  in parport_attach()
223 	if (port->cad != device.pardev)  in parport_detach()