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1/*
2 * PTP 1588 clock support
3 *
4 * Copyright (C) 2010 OMICRON electronics GmbH
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 */
20#include <linux/idr.h>
21#include <linux/device.h>
22#include <linux/err.h>
23#include <linux/init.h>
24#include <linux/kernel.h>
25#include <linux/module.h>
26#include <linux/posix-clock.h>
27#include <linux/pps_kernel.h>
28#include <linux/slab.h>
29#include <linux/syscalls.h>
30#include <linux/uaccess.h>
31
32#include "ptp_private.h"
33
34#define PTP_MAX_ALARMS 4
35#define PTP_PPS_DEFAULTS (PPS_CAPTUREASSERT | PPS_OFFSETASSERT)
36#define PTP_PPS_EVENT PPS_CAPTUREASSERT
37#define PTP_PPS_MODE (PTP_PPS_DEFAULTS | PPS_CANWAIT | PPS_TSFMT_TSPEC)
38
39/* private globals */
40
41static dev_t ptp_devt;
42static struct class *ptp_class;
43
44static DEFINE_IDA(ptp_clocks_map);
45
46/* time stamp event queue operations */
47
48static inline int queue_free(struct timestamp_event_queue *q)
49{
50 return PTP_MAX_TIMESTAMPS - queue_cnt(q) - 1;
51}
52
53static void enqueue_external_timestamp(struct timestamp_event_queue *queue,
54 struct ptp_clock_event *src)
55{
56 struct ptp_extts_event *dst;
57 unsigned long flags;
58 s64 seconds;
59 u32 remainder;
60
61 seconds = div_u64_rem(src->timestamp, 1000000000, &remainder);
62
63 spin_lock_irqsave(&queue->lock, flags);
64
65 dst = &queue->buf[queue->tail];
66 dst->index = src->index;
67 dst->t.sec = seconds;
68 dst->t.nsec = remainder;
69
70 if (!queue_free(queue))
71 queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS;
72
73 queue->tail = (queue->tail + 1) % PTP_MAX_TIMESTAMPS;
74
75 spin_unlock_irqrestore(&queue->lock, flags);
76}
77
78static s32 scaled_ppm_to_ppb(long ppm)
79{
80 /*
81 * The 'freq' field in the 'struct timex' is in parts per
82 * million, but with a 16 bit binary fractional field.
83 *
84 * We want to calculate
85 *
86 * ppb = scaled_ppm * 1000 / 2^16
87 *
88 * which simplifies to
89 *
90 * ppb = scaled_ppm * 125 / 2^13
91 */
92 s64 ppb = 1 + ppm;
93 ppb *= 125;
94 ppb >>= 13;
95 return (s32) ppb;
96}
97
98/* posix clock implementation */
99
100static int ptp_clock_getres(struct posix_clock *pc, struct timespec *tp)
101{
102 tp->tv_sec = 0;
103 tp->tv_nsec = 1;
104 return 0;
105}
106
107static int ptp_clock_settime(struct posix_clock *pc, const struct timespec *tp)
108{
109 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
110 return ptp->info->settime(ptp->info, tp);
111}
112
113static int ptp_clock_gettime(struct posix_clock *pc, struct timespec *tp)
114{
115 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
116 return ptp->info->gettime(ptp->info, tp);
117}
118
119static int ptp_clock_adjtime(struct posix_clock *pc, struct timex *tx)
120{
121 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
122 struct ptp_clock_info *ops;
123 int err = -EOPNOTSUPP;
124
125 ops = ptp->info;
126
127 if (tx->modes & ADJ_SETOFFSET) {
128 struct timespec ts;
129 ktime_t kt;
130 s64 delta;
131
132 ts.tv_sec = tx->time.tv_sec;
133 ts.tv_nsec = tx->time.tv_usec;
134
135 if (!(tx->modes & ADJ_NANO))
136 ts.tv_nsec *= 1000;
137
138 if ((unsigned long) ts.tv_nsec >= NSEC_PER_SEC)
139 return -EINVAL;
140
141 kt = timespec_to_ktime(ts);
142 delta = ktime_to_ns(kt);
143 err = ops->adjtime(ops, delta);
144 } else if (tx->modes & ADJ_FREQUENCY) {
145 err = ops->adjfreq(ops, scaled_ppm_to_ppb(tx->freq));
146 ptp->dialed_frequency = tx->freq;
147 } else if (tx->modes == 0) {
148 tx->freq = ptp->dialed_frequency;
149 err = 0;
150 }
151
152 return err;
153}
154
155static struct posix_clock_operations ptp_clock_ops = {
156 .owner = THIS_MODULE,
157 .clock_adjtime = ptp_clock_adjtime,
158 .clock_gettime = ptp_clock_gettime,
159 .clock_getres = ptp_clock_getres,
160 .clock_settime = ptp_clock_settime,
161 .ioctl = ptp_ioctl,
162 .open = ptp_open,
163 .poll = ptp_poll,
164 .read = ptp_read,
165};
166
167static void delete_ptp_clock(struct posix_clock *pc)
168{
169 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
170
171 mutex_destroy(&ptp->tsevq_mux);
172 mutex_destroy(&ptp->pincfg_mux);
173 ida_simple_remove(&ptp_clocks_map, ptp->index);
174 kfree(ptp);
175}
176
177/* public interface */
178
179struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
180 struct device *parent)
181{
182 struct ptp_clock *ptp;
183 int err = 0, index, major = MAJOR(ptp_devt);
184
185 if (info->n_alarm > PTP_MAX_ALARMS)
186 return ERR_PTR(-EINVAL);
187
188 /* Initialize a clock structure. */
189 err = -ENOMEM;
190 ptp = kzalloc(sizeof(struct ptp_clock), GFP_KERNEL);
191 if (ptp == NULL)
192 goto no_memory;
193
194 index = ida_simple_get(&ptp_clocks_map, 0, MINORMASK + 1, GFP_KERNEL);
195 if (index < 0) {
196 err = index;
197 goto no_slot;
198 }
199
200 ptp->clock.ops = ptp_clock_ops;
201 ptp->clock.release = delete_ptp_clock;
202 ptp->info = info;
203 ptp->devid = MKDEV(major, index);
204 ptp->index = index;
205 spin_lock_init(&ptp->tsevq.lock);
206 mutex_init(&ptp->tsevq_mux);
207 mutex_init(&ptp->pincfg_mux);
208 init_waitqueue_head(&ptp->tsev_wq);
209
210 /* Create a new device in our class. */
211 ptp->dev = device_create(ptp_class, parent, ptp->devid, ptp,
212 "ptp%d", ptp->index);
213 if (IS_ERR(ptp->dev))
214 goto no_device;
215
216 dev_set_drvdata(ptp->dev, ptp);
217
218 err = ptp_populate_sysfs(ptp);
219 if (err)
220 goto no_sysfs;
221
222 /* Register a new PPS source. */
223 if (info->pps) {
224 struct pps_source_info pps;
225 memset(&pps, 0, sizeof(pps));
226 snprintf(pps.name, PPS_MAX_NAME_LEN, "ptp%d", index);
227 pps.mode = PTP_PPS_MODE;
228 pps.owner = info->owner;
229 ptp->pps_source = pps_register_source(&pps, PTP_PPS_DEFAULTS);
230 if (!ptp->pps_source) {
231 pr_err("failed to register pps source\n");
232 goto no_pps;
233 }
234 }
235
236 /* Create a posix clock. */
237 err = posix_clock_register(&ptp->clock, ptp->devid);
238 if (err) {
239 pr_err("failed to create posix clock\n");
240 goto no_clock;
241 }
242
243 return ptp;
244
245no_clock:
246 if (ptp->pps_source)
247 pps_unregister_source(ptp->pps_source);
248no_pps:
249 ptp_cleanup_sysfs(ptp);
250no_sysfs:
251 device_destroy(ptp_class, ptp->devid);
252no_device:
253 mutex_destroy(&ptp->tsevq_mux);
254 mutex_destroy(&ptp->pincfg_mux);
255no_slot:
256 kfree(ptp);
257no_memory:
258 return ERR_PTR(err);
259}
260EXPORT_SYMBOL(ptp_clock_register);
261
262int ptp_clock_unregister(struct ptp_clock *ptp)
263{
264 ptp->defunct = 1;
265 wake_up_interruptible(&ptp->tsev_wq);
266
267 /* Release the clock's resources. */
268 if (ptp->pps_source)
269 pps_unregister_source(ptp->pps_source);
270 ptp_cleanup_sysfs(ptp);
271 device_destroy(ptp_class, ptp->devid);
272
273 posix_clock_unregister(&ptp->clock);
274 return 0;
275}
276EXPORT_SYMBOL(ptp_clock_unregister);
277
278void ptp_clock_event(struct ptp_clock *ptp, struct ptp_clock_event *event)
279{
280 struct pps_event_time evt;
281
282 switch (event->type) {
283
284 case PTP_CLOCK_ALARM:
285 break;
286
287 case PTP_CLOCK_EXTTS:
288 enqueue_external_timestamp(&ptp->tsevq, event);
289 wake_up_interruptible(&ptp->tsev_wq);
290 break;
291
292 case PTP_CLOCK_PPS:
293 pps_get_ts(&evt);
294 pps_event(ptp->pps_source, &evt, PTP_PPS_EVENT, NULL);
295 break;
296
297 case PTP_CLOCK_PPSUSR:
298 pps_event(ptp->pps_source, &event->pps_times,
299 PTP_PPS_EVENT, NULL);
300 break;
301 }
302}
303EXPORT_SYMBOL(ptp_clock_event);
304
305int ptp_clock_index(struct ptp_clock *ptp)
306{
307 return ptp->index;
308}
309EXPORT_SYMBOL(ptp_clock_index);
310
311int ptp_find_pin(struct ptp_clock *ptp,
312 enum ptp_pin_function func, unsigned int chan)
313{
314 struct ptp_pin_desc *pin = NULL;
315 int i;
316
317 mutex_lock(&ptp->pincfg_mux);
318 for (i = 0; i < ptp->info->n_pins; i++) {
319 if (ptp->info->pin_config[i].func == func &&
320 ptp->info->pin_config[i].chan == chan) {
321 pin = &ptp->info->pin_config[i];
322 break;
323 }
324 }
325 mutex_unlock(&ptp->pincfg_mux);
326
327 return pin ? i : -1;
328}
329EXPORT_SYMBOL(ptp_find_pin);
330
331/* module operations */
332
333static void __exit ptp_exit(void)
334{
335 class_destroy(ptp_class);
336 unregister_chrdev_region(ptp_devt, MINORMASK + 1);
337 ida_destroy(&ptp_clocks_map);
338}
339
340static int __init ptp_init(void)
341{
342 int err;
343
344 ptp_class = class_create(THIS_MODULE, "ptp");
345 if (IS_ERR(ptp_class)) {
346 pr_err("ptp: failed to allocate class\n");
347 return PTR_ERR(ptp_class);
348 }
349
350 err = alloc_chrdev_region(&ptp_devt, 0, MINORMASK + 1, "ptp");
351 if (err < 0) {
352 pr_err("ptp: failed to allocate device region\n");
353 goto no_region;
354 }
355
356 ptp_class->dev_groups = ptp_groups;
357 pr_info("PTP clock support registered\n");
358 return 0;
359
360no_region:
361 class_destroy(ptp_class);
362 return err;
363}
364
365subsys_initcall(ptp_init);
366module_exit(ptp_exit);
367
368MODULE_AUTHOR("Richard Cochran <richardcochran@gmail.com>");
369MODULE_DESCRIPTION("PTP clocks support");
370MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * PTP 1588 clock support
4 *
5 * Copyright (C) 2010 OMICRON electronics GmbH
6 */
7#include <linux/idr.h>
8#include <linux/device.h>
9#include <linux/err.h>
10#include <linux/init.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/posix-clock.h>
14#include <linux/pps_kernel.h>
15#include <linux/slab.h>
16#include <linux/syscalls.h>
17#include <linux/uaccess.h>
18#include <uapi/linux/sched/types.h>
19
20#include "ptp_private.h"
21
22#define PTP_MAX_ALARMS 4
23#define PTP_PPS_DEFAULTS (PPS_CAPTUREASSERT | PPS_OFFSETASSERT)
24#define PTP_PPS_EVENT PPS_CAPTUREASSERT
25#define PTP_PPS_MODE (PTP_PPS_DEFAULTS | PPS_CANWAIT | PPS_TSFMT_TSPEC)
26
27struct class *ptp_class;
28
29/* private globals */
30
31static dev_t ptp_devt;
32
33static DEFINE_IDA(ptp_clocks_map);
34
35/* time stamp event queue operations */
36
37static inline int queue_free(struct timestamp_event_queue *q)
38{
39 return PTP_MAX_TIMESTAMPS - queue_cnt(q) - 1;
40}
41
42static void enqueue_external_timestamp(struct timestamp_event_queue *queue,
43 struct ptp_clock_event *src)
44{
45 struct ptp_extts_event *dst;
46 unsigned long flags;
47 s64 seconds;
48 u32 remainder;
49
50 seconds = div_u64_rem(src->timestamp, 1000000000, &remainder);
51
52 spin_lock_irqsave(&queue->lock, flags);
53
54 dst = &queue->buf[queue->tail];
55 dst->index = src->index;
56 dst->t.sec = seconds;
57 dst->t.nsec = remainder;
58
59 if (!queue_free(queue))
60 queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS;
61
62 queue->tail = (queue->tail + 1) % PTP_MAX_TIMESTAMPS;
63
64 spin_unlock_irqrestore(&queue->lock, flags);
65}
66
67/* posix clock implementation */
68
69static int ptp_clock_getres(struct posix_clock *pc, struct timespec64 *tp)
70{
71 tp->tv_sec = 0;
72 tp->tv_nsec = 1;
73 return 0;
74}
75
76static int ptp_clock_settime(struct posix_clock *pc, const struct timespec64 *tp)
77{
78 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
79
80 if (ptp_vclock_in_use(ptp)) {
81 pr_err("ptp: virtual clock in use\n");
82 return -EBUSY;
83 }
84
85 return ptp->info->settime64(ptp->info, tp);
86}
87
88static int ptp_clock_gettime(struct posix_clock *pc, struct timespec64 *tp)
89{
90 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
91 int err;
92
93 if (ptp->info->gettimex64)
94 err = ptp->info->gettimex64(ptp->info, tp, NULL);
95 else
96 err = ptp->info->gettime64(ptp->info, tp);
97 return err;
98}
99
100static int ptp_clock_adjtime(struct posix_clock *pc, struct __kernel_timex *tx)
101{
102 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
103 struct ptp_clock_info *ops;
104 int err = -EOPNOTSUPP;
105
106 if (ptp_vclock_in_use(ptp)) {
107 pr_err("ptp: virtual clock in use\n");
108 return -EBUSY;
109 }
110
111 ops = ptp->info;
112
113 if (tx->modes & ADJ_SETOFFSET) {
114 struct timespec64 ts;
115 ktime_t kt;
116 s64 delta;
117
118 ts.tv_sec = tx->time.tv_sec;
119 ts.tv_nsec = tx->time.tv_usec;
120
121 if (!(tx->modes & ADJ_NANO))
122 ts.tv_nsec *= 1000;
123
124 if ((unsigned long) ts.tv_nsec >= NSEC_PER_SEC)
125 return -EINVAL;
126
127 kt = timespec64_to_ktime(ts);
128 delta = ktime_to_ns(kt);
129 err = ops->adjtime(ops, delta);
130 } else if (tx->modes & ADJ_FREQUENCY) {
131 long ppb = scaled_ppm_to_ppb(tx->freq);
132 if (ppb > ops->max_adj || ppb < -ops->max_adj)
133 return -ERANGE;
134 if (ops->adjfine)
135 err = ops->adjfine(ops, tx->freq);
136 else
137 err = ops->adjfreq(ops, ppb);
138 ptp->dialed_frequency = tx->freq;
139 } else if (tx->modes & ADJ_OFFSET) {
140 if (ops->adjphase) {
141 s32 offset = tx->offset;
142
143 if (!(tx->modes & ADJ_NANO))
144 offset *= NSEC_PER_USEC;
145
146 err = ops->adjphase(ops, offset);
147 }
148 } else if (tx->modes == 0) {
149 tx->freq = ptp->dialed_frequency;
150 err = 0;
151 }
152
153 return err;
154}
155
156static struct posix_clock_operations ptp_clock_ops = {
157 .owner = THIS_MODULE,
158 .clock_adjtime = ptp_clock_adjtime,
159 .clock_gettime = ptp_clock_gettime,
160 .clock_getres = ptp_clock_getres,
161 .clock_settime = ptp_clock_settime,
162 .ioctl = ptp_ioctl,
163 .open = ptp_open,
164 .poll = ptp_poll,
165 .read = ptp_read,
166};
167
168static void ptp_clock_release(struct device *dev)
169{
170 struct ptp_clock *ptp = container_of(dev, struct ptp_clock, dev);
171
172 ptp_cleanup_pin_groups(ptp);
173 mutex_destroy(&ptp->tsevq_mux);
174 mutex_destroy(&ptp->pincfg_mux);
175 mutex_destroy(&ptp->n_vclocks_mux);
176 ida_simple_remove(&ptp_clocks_map, ptp->index);
177 kfree(ptp);
178}
179
180static void ptp_aux_kworker(struct kthread_work *work)
181{
182 struct ptp_clock *ptp = container_of(work, struct ptp_clock,
183 aux_work.work);
184 struct ptp_clock_info *info = ptp->info;
185 long delay;
186
187 delay = info->do_aux_work(info);
188
189 if (delay >= 0)
190 kthread_queue_delayed_work(ptp->kworker, &ptp->aux_work, delay);
191}
192
193/* public interface */
194
195struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
196 struct device *parent)
197{
198 struct ptp_clock *ptp;
199 int err = 0, index, major = MAJOR(ptp_devt);
200 size_t size;
201
202 if (info->n_alarm > PTP_MAX_ALARMS)
203 return ERR_PTR(-EINVAL);
204
205 /* Initialize a clock structure. */
206 err = -ENOMEM;
207 ptp = kzalloc(sizeof(struct ptp_clock), GFP_KERNEL);
208 if (ptp == NULL)
209 goto no_memory;
210
211 index = ida_simple_get(&ptp_clocks_map, 0, MINORMASK + 1, GFP_KERNEL);
212 if (index < 0) {
213 err = index;
214 goto no_slot;
215 }
216
217 ptp->clock.ops = ptp_clock_ops;
218 ptp->info = info;
219 ptp->devid = MKDEV(major, index);
220 ptp->index = index;
221 spin_lock_init(&ptp->tsevq.lock);
222 mutex_init(&ptp->tsevq_mux);
223 mutex_init(&ptp->pincfg_mux);
224 mutex_init(&ptp->n_vclocks_mux);
225 init_waitqueue_head(&ptp->tsev_wq);
226
227 if (ptp->info->do_aux_work) {
228 kthread_init_delayed_work(&ptp->aux_work, ptp_aux_kworker);
229 ptp->kworker = kthread_create_worker(0, "ptp%d", ptp->index);
230 if (IS_ERR(ptp->kworker)) {
231 err = PTR_ERR(ptp->kworker);
232 pr_err("failed to create ptp aux_worker %d\n", err);
233 goto kworker_err;
234 }
235 }
236
237 /* PTP virtual clock is being registered under physical clock */
238 if (parent && parent->class && parent->class->name &&
239 strcmp(parent->class->name, "ptp") == 0)
240 ptp->is_virtual_clock = true;
241
242 if (!ptp->is_virtual_clock) {
243 ptp->max_vclocks = PTP_DEFAULT_MAX_VCLOCKS;
244
245 size = sizeof(int) * ptp->max_vclocks;
246 ptp->vclock_index = kzalloc(size, GFP_KERNEL);
247 if (!ptp->vclock_index) {
248 err = -ENOMEM;
249 goto no_mem_for_vclocks;
250 }
251 }
252
253 err = ptp_populate_pin_groups(ptp);
254 if (err)
255 goto no_pin_groups;
256
257 /* Register a new PPS source. */
258 if (info->pps) {
259 struct pps_source_info pps;
260 memset(&pps, 0, sizeof(pps));
261 snprintf(pps.name, PPS_MAX_NAME_LEN, "ptp%d", index);
262 pps.mode = PTP_PPS_MODE;
263 pps.owner = info->owner;
264 ptp->pps_source = pps_register_source(&pps, PTP_PPS_DEFAULTS);
265 if (IS_ERR(ptp->pps_source)) {
266 err = PTR_ERR(ptp->pps_source);
267 pr_err("failed to register pps source\n");
268 goto no_pps;
269 }
270 ptp->pps_source->lookup_cookie = ptp;
271 }
272
273 /* Initialize a new device of our class in our clock structure. */
274 device_initialize(&ptp->dev);
275 ptp->dev.devt = ptp->devid;
276 ptp->dev.class = ptp_class;
277 ptp->dev.parent = parent;
278 ptp->dev.groups = ptp->pin_attr_groups;
279 ptp->dev.release = ptp_clock_release;
280 dev_set_drvdata(&ptp->dev, ptp);
281 dev_set_name(&ptp->dev, "ptp%d", ptp->index);
282
283 /* Create a posix clock and link it to the device. */
284 err = posix_clock_register(&ptp->clock, &ptp->dev);
285 if (err) {
286 if (ptp->pps_source)
287 pps_unregister_source(ptp->pps_source);
288
289 kfree(ptp->vclock_index);
290
291 if (ptp->kworker)
292 kthread_destroy_worker(ptp->kworker);
293
294 put_device(&ptp->dev);
295
296 pr_err("failed to create posix clock\n");
297 return ERR_PTR(err);
298 }
299
300 return ptp;
301
302no_pps:
303 ptp_cleanup_pin_groups(ptp);
304no_pin_groups:
305 kfree(ptp->vclock_index);
306no_mem_for_vclocks:
307 if (ptp->kworker)
308 kthread_destroy_worker(ptp->kworker);
309kworker_err:
310 mutex_destroy(&ptp->tsevq_mux);
311 mutex_destroy(&ptp->pincfg_mux);
312 mutex_destroy(&ptp->n_vclocks_mux);
313 ida_simple_remove(&ptp_clocks_map, index);
314no_slot:
315 kfree(ptp);
316no_memory:
317 return ERR_PTR(err);
318}
319EXPORT_SYMBOL(ptp_clock_register);
320
321int ptp_clock_unregister(struct ptp_clock *ptp)
322{
323 if (ptp_vclock_in_use(ptp)) {
324 pr_err("ptp: virtual clock in use\n");
325 return -EBUSY;
326 }
327
328 ptp->defunct = 1;
329 wake_up_interruptible(&ptp->tsev_wq);
330
331 kfree(ptp->vclock_index);
332
333 if (ptp->kworker) {
334 kthread_cancel_delayed_work_sync(&ptp->aux_work);
335 kthread_destroy_worker(ptp->kworker);
336 }
337
338 /* Release the clock's resources. */
339 if (ptp->pps_source)
340 pps_unregister_source(ptp->pps_source);
341
342 posix_clock_unregister(&ptp->clock);
343
344 return 0;
345}
346EXPORT_SYMBOL(ptp_clock_unregister);
347
348void ptp_clock_event(struct ptp_clock *ptp, struct ptp_clock_event *event)
349{
350 struct pps_event_time evt;
351
352 switch (event->type) {
353
354 case PTP_CLOCK_ALARM:
355 break;
356
357 case PTP_CLOCK_EXTTS:
358 enqueue_external_timestamp(&ptp->tsevq, event);
359 wake_up_interruptible(&ptp->tsev_wq);
360 break;
361
362 case PTP_CLOCK_PPS:
363 pps_get_ts(&evt);
364 pps_event(ptp->pps_source, &evt, PTP_PPS_EVENT, NULL);
365 break;
366
367 case PTP_CLOCK_PPSUSR:
368 pps_event(ptp->pps_source, &event->pps_times,
369 PTP_PPS_EVENT, NULL);
370 break;
371 }
372}
373EXPORT_SYMBOL(ptp_clock_event);
374
375int ptp_clock_index(struct ptp_clock *ptp)
376{
377 return ptp->index;
378}
379EXPORT_SYMBOL(ptp_clock_index);
380
381int ptp_find_pin(struct ptp_clock *ptp,
382 enum ptp_pin_function func, unsigned int chan)
383{
384 struct ptp_pin_desc *pin = NULL;
385 int i;
386
387 for (i = 0; i < ptp->info->n_pins; i++) {
388 if (ptp->info->pin_config[i].func == func &&
389 ptp->info->pin_config[i].chan == chan) {
390 pin = &ptp->info->pin_config[i];
391 break;
392 }
393 }
394
395 return pin ? i : -1;
396}
397EXPORT_SYMBOL(ptp_find_pin);
398
399int ptp_find_pin_unlocked(struct ptp_clock *ptp,
400 enum ptp_pin_function func, unsigned int chan)
401{
402 int result;
403
404 mutex_lock(&ptp->pincfg_mux);
405
406 result = ptp_find_pin(ptp, func, chan);
407
408 mutex_unlock(&ptp->pincfg_mux);
409
410 return result;
411}
412EXPORT_SYMBOL(ptp_find_pin_unlocked);
413
414int ptp_schedule_worker(struct ptp_clock *ptp, unsigned long delay)
415{
416 return kthread_mod_delayed_work(ptp->kworker, &ptp->aux_work, delay);
417}
418EXPORT_SYMBOL(ptp_schedule_worker);
419
420void ptp_cancel_worker_sync(struct ptp_clock *ptp)
421{
422 kthread_cancel_delayed_work_sync(&ptp->aux_work);
423}
424EXPORT_SYMBOL(ptp_cancel_worker_sync);
425
426/* module operations */
427
428static void __exit ptp_exit(void)
429{
430 class_destroy(ptp_class);
431 unregister_chrdev_region(ptp_devt, MINORMASK + 1);
432 ida_destroy(&ptp_clocks_map);
433}
434
435static int __init ptp_init(void)
436{
437 int err;
438
439 ptp_class = class_create(THIS_MODULE, "ptp");
440 if (IS_ERR(ptp_class)) {
441 pr_err("ptp: failed to allocate class\n");
442 return PTR_ERR(ptp_class);
443 }
444
445 err = alloc_chrdev_region(&ptp_devt, 0, MINORMASK + 1, "ptp");
446 if (err < 0) {
447 pr_err("ptp: failed to allocate device region\n");
448 goto no_region;
449 }
450
451 ptp_class->dev_groups = ptp_groups;
452 pr_info("PTP clock support registered\n");
453 return 0;
454
455no_region:
456 class_destroy(ptp_class);
457 return err;
458}
459
460subsys_initcall(ptp_init);
461module_exit(ptp_exit);
462
463MODULE_AUTHOR("Richard Cochran <richardcochran@gmail.com>");
464MODULE_DESCRIPTION("PTP clocks support");
465MODULE_LICENSE("GPL");