DEVFS - remove dev_ops_add(), dev_ops_get(), and get_dev()
[dragonfly.git] / sys / dev / misc / pps / pps.c
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1/*
2 * ----------------------------------------------------------------------------
3 * "THE BEER-WARE LICENSE" (Revision 42):
4 * <phk@FreeBSD.org> wrote this file. As long as you retain this notice you
5 * can do whatever you want with this stuff. If we meet some day, and you think
6 * this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
7 * ----------------------------------------------------------------------------
8 *
9 * $FreeBSD: src/sys/dev/ppbus/pps.c,v 1.24.2.1 2000/05/24 00:20:57 n_hibma Exp $
1f7ab7c9 10 * $DragonFly: src/sys/dev/misc/pps/pps.c,v 1.17 2006/10/25 20:55:55 dillon Exp $
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11 *
12 * This driver implements a draft-mogul-pps-api-02.txt PPS source.
13 *
14 * The input pin is pin#10
15 * The echo output pin is pin#14
16 *
17 */
18
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19#include "use_pps.h"
20
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21#include <sys/param.h>
22#include <sys/kernel.h>
23#include <sys/systm.h>
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24#include <sys/conf.h>
25#include <sys/device.h>
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26#include <sys/module.h>
27#include <sys/bus.h>
984263bc 28#include <sys/timepps.h>
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29#include <sys/rman.h>
30
1f2de5d4 31#include <bus/ppbus/ppbconf.h>
1f2de5d4 32#include <bus/ppbus/ppbio.h>
984263bc 33
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34#include "ppbus_if.h"
35
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36#define PPS_NAME "pps" /* our official name */
37
38struct pps_data {
39 int pps_open;
40 struct ppb_device pps_dev;
41 struct pps_state pps;
42
43 struct resource *intr_resource; /* interrupt resource */
44 void *intr_cookie; /* interrupt registration cookie */
45};
46
47static void ppsintr(void *arg);
48
49#define DEVTOSOFTC(dev) \
50 ((struct pps_data *)device_get_softc(dev))
51#define UNITOSOFTC(unit) \
52 ((struct pps_data *)devclass_get_softc(pps_devclass, (unit)))
53#define UNITODEVICE(unit) \
54 (devclass_get_device(pps_devclass, (unit)))
55
56static devclass_t pps_devclass;
57
58static d_open_t ppsopen;
59static d_close_t ppsclose;
60static d_ioctl_t ppsioctl;
61
62#define CDEV_MAJOR 89
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63static struct dev_ops pps_ops = {
64 { PPS_NAME, CDEV_MAJOR, 0 },
65 .d_open = ppsopen,
66 .d_close = ppsclose,
67 .d_ioctl = ppsioctl,
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68};
69
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70static int
71ppsprobe(device_t ppsdev)
72{
73 struct pps_data *sc;
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74
75 sc = DEVTOSOFTC(ppsdev);
76 bzero(sc, sizeof(struct pps_data));
77
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78 device_set_desc(ppsdev, "Pulse per second Timing Interface");
79
80 sc->pps.ppscap = PPS_CAPTUREASSERT | PPS_ECHOASSERT;
81 pps_init(&sc->pps);
82 return (0);
83}
84
85static int
d471ee7d 86ppsattach(device_t ppsdev)
984263bc 87{
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88 struct pps_data *sc = DEVTOSOFTC(ppsdev);
89 device_t ppbus = device_get_parent(ppsdev);
90 int irq;
e4c9c0c8 91 int unit;
d471ee7d 92 int zero = 0;
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93
94 /* retrieve the ppbus irq */
d471ee7d 95 BUS_READ_IVAR(ppbus, ppsdev, PPBUS_IVAR_IRQ, &irq);
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96
97 if (irq > 0) {
98 /* declare our interrupt handler */
d471ee7d 99 sc->intr_resource = bus_alloc_resource(ppsdev, SYS_RES_IRQ,
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100 &zero, irq, irq, 1, RF_SHAREABLE);
101 }
102 /* interrupts seem mandatory */
103 if (sc->intr_resource == 0)
104 return (ENXIO);
105
e4c9c0c8 106 unit = device_get_unit(ppsdev);
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107 make_dev(&pps_ops, unit, UID_ROOT, GID_WHEEL,
108 0644, PPS_NAME "%d", unit);
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109 return (0);
110}
111
112static int
fef8985e 113ppsopen(struct dev_open_args *ap)
984263bc 114{
b13267a5 115 cdev_t dev = ap->a_head.a_dev;
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116 u_int unit = minor(dev);
117 struct pps_data *sc = UNITOSOFTC(unit);
118 device_t ppsdev = UNITODEVICE(unit);
119 device_t ppbus = device_get_parent(ppsdev);
120 int error;
121
122 if (!sc->pps_open) {
123 if (ppb_request_bus(ppbus, ppsdev, PPB_WAIT|PPB_INTR))
124 return (EINTR);
125
126 /* attach the interrupt handler */
127 if ((error = BUS_SETUP_INTR(ppbus, ppsdev, sc->intr_resource,
ee61f228 128 0, ppsintr, ppsdev,
e9cb6d99 129 &sc->intr_cookie, NULL))) {
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130 ppb_release_bus(ppbus, ppsdev);
131 return (error);
132 }
133
134 ppb_wctr(ppbus, 0);
135 ppb_wctr(ppbus, IRQENABLE);
136 sc->pps_open = 1;
137 }
138
139 return(0);
140}
141
142static int
fef8985e 143ppsclose(struct dev_close_args *ap)
984263bc 144{
b13267a5 145 cdev_t dev = ap->a_head.a_dev;
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146 u_int unit = minor(dev);
147 struct pps_data *sc = UNITOSOFTC(unit);
148 device_t ppsdev = UNITODEVICE(unit);
149 device_t ppbus = device_get_parent(ppsdev);
150
151 sc->pps.ppsparam.mode = 0; /* PHK ??? */
152
153 ppb_wdtr(ppbus, 0);
154 ppb_wctr(ppbus, 0);
155
156 /* Note: the interrupt handler is automatically detached */
157 ppb_release_bus(ppbus, ppsdev);
158 sc->pps_open = 0;
159 return(0);
160}
161
162static void
163ppsintr(void *arg)
164{
165 device_t ppsdev = (device_t)arg;
166 device_t ppbus = device_get_parent(ppsdev);
167 struct pps_data *sc = DEVTOSOFTC(ppsdev);
88c4d2f6 168 sysclock_t count;
984263bc 169
044ee7c4 170 count = sys_cputimer->count();
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171 if (!(ppb_rstr(ppbus) & nACK))
172 return;
173 if (sc->pps.ppsparam.mode & PPS_ECHOASSERT)
174 ppb_wctr(ppbus, IRQENABLE | AUTOFEED);
88c4d2f6 175 pps_event(&sc->pps, count, PPS_CAPTUREASSERT);
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176 if (sc->pps.ppsparam.mode & PPS_ECHOASSERT)
177 ppb_wctr(ppbus, IRQENABLE);
178}
179
180static int
fef8985e 181ppsioctl(struct dev_ioctl_args *ap)
984263bc 182{
b13267a5 183 cdev_t dev = ap->a_head.a_dev;
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184 u_int unit = minor(dev);
185 struct pps_data *sc = UNITOSOFTC(unit);
186
fef8985e 187 return (pps_ioctl(ap->a_cmd, ap->a_data, &sc->pps));
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188}
189
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190/*
191 * Becuase pps is a static device under any attached ppbus, and not scanned
192 * by the ppbus, we need an identify function to create the device.
193 */
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194static device_method_t pps_methods[] = {
195 /* device interface */
39b5d600 196 DEVMETHOD(device_identify, bus_generic_identify),
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197 DEVMETHOD(device_probe, ppsprobe),
198 DEVMETHOD(device_attach, ppsattach),
199
200 { 0, 0 }
201};
202
203static driver_t pps_driver = {
204 PPS_NAME,
205 pps_methods,
206 sizeof(struct pps_data),
207};
208DRIVER_MODULE(pps, ppbus, pps_driver, pps_devclass, 0, 0);