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d94ba80e RC |
1 | /* |
2 | * PTP 1588 clock support - character device implementation. | |
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/module.h> | |
21 | #include <linux/posix-clock.h> | |
22 | #include <linux/poll.h> | |
23 | #include <linux/sched.h> | |
c7ec0bad | 24 | #include <linux/slab.h> |
719f1aa4 | 25 | #include <linux/timekeeping.h> |
d94ba80e | 26 | |
efa61c8c GS |
27 | #include <linux/nospec.h> |
28 | ||
d94ba80e RC |
29 | #include "ptp_private.h" |
30 | ||
6092315d RC |
31 | static int ptp_disable_pinfunc(struct ptp_clock_info *ops, |
32 | enum ptp_pin_function func, unsigned int chan) | |
33 | { | |
34 | struct ptp_clock_request rq; | |
35 | int err = 0; | |
36 | ||
37 | memset(&rq, 0, sizeof(rq)); | |
38 | ||
39 | switch (func) { | |
40 | case PTP_PF_NONE: | |
41 | break; | |
42 | case PTP_PF_EXTTS: | |
43 | rq.type = PTP_CLK_REQ_EXTTS; | |
44 | rq.extts.index = chan; | |
45 | err = ops->enable(ops, &rq, 0); | |
46 | break; | |
47 | case PTP_PF_PEROUT: | |
48 | rq.type = PTP_CLK_REQ_PEROUT; | |
49 | rq.perout.index = chan; | |
50 | err = ops->enable(ops, &rq, 0); | |
51 | break; | |
52 | case PTP_PF_PHYSYNC: | |
53 | break; | |
54 | default: | |
55 | return -EINVAL; | |
56 | } | |
57 | ||
58 | return err; | |
59 | } | |
60 | ||
61 | int ptp_set_pinfunc(struct ptp_clock *ptp, unsigned int pin, | |
62 | enum ptp_pin_function func, unsigned int chan) | |
63 | { | |
64 | struct ptp_clock_info *info = ptp->info; | |
65 | struct ptp_pin_desc *pin1 = NULL, *pin2 = &info->pin_config[pin]; | |
66 | unsigned int i; | |
67 | ||
68 | /* Check to see if any other pin previously had this function. */ | |
69 | for (i = 0; i < info->n_pins; i++) { | |
70 | if (info->pin_config[i].func == func && | |
71 | info->pin_config[i].chan == chan) { | |
72 | pin1 = &info->pin_config[i]; | |
73 | break; | |
74 | } | |
75 | } | |
76 | if (pin1 && i == pin) | |
77 | return 0; | |
78 | ||
79 | /* Check the desired function and channel. */ | |
80 | switch (func) { | |
81 | case PTP_PF_NONE: | |
82 | break; | |
83 | case PTP_PF_EXTTS: | |
84 | if (chan >= info->n_ext_ts) | |
85 | return -EINVAL; | |
86 | break; | |
87 | case PTP_PF_PEROUT: | |
88 | if (chan >= info->n_per_out) | |
89 | return -EINVAL; | |
90 | break; | |
91 | case PTP_PF_PHYSYNC: | |
72df7a72 SS |
92 | if (chan != 0) |
93 | return -EINVAL; | |
9ba8376c | 94 | break; |
6092315d RC |
95 | default: |
96 | return -EINVAL; | |
97 | } | |
98 | ||
6092315d RC |
99 | if (info->verify(info, pin, func, chan)) { |
100 | pr_err("driver cannot use function %u on pin %u\n", func, chan); | |
101 | return -EOPNOTSUPP; | |
102 | } | |
103 | ||
104 | /* Disable whatever function was previously assigned. */ | |
105 | if (pin1) { | |
106 | ptp_disable_pinfunc(info, func, chan); | |
107 | pin1->func = PTP_PF_NONE; | |
108 | pin1->chan = 0; | |
109 | } | |
110 | ptp_disable_pinfunc(info, pin2->func, pin2->chan); | |
111 | pin2->func = func; | |
112 | pin2->chan = chan; | |
113 | ||
114 | return 0; | |
115 | } | |
116 | ||
d94ba80e RC |
117 | int ptp_open(struct posix_clock *pc, fmode_t fmode) |
118 | { | |
119 | return 0; | |
120 | } | |
121 | ||
122 | long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg) | |
123 | { | |
124 | struct ptp_clock_caps caps; | |
125 | struct ptp_clock_request req; | |
c3484c27 | 126 | struct ptp_sys_offset *sysoff = NULL; |
719f1aa4 | 127 | struct ptp_sys_offset_precise precise_offset; |
6092315d | 128 | struct ptp_pin_desc pd; |
d94ba80e RC |
129 | struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); |
130 | struct ptp_clock_info *ops = ptp->info; | |
215b13dd | 131 | struct ptp_clock_time *pct; |
e13cfcb0 | 132 | struct timespec64 ts; |
719f1aa4 | 133 | struct system_device_crosststamp xtstamp; |
d94ba80e | 134 | int enable, err = 0; |
6092315d | 135 | unsigned int i, pin_index; |
d94ba80e RC |
136 | |
137 | switch (cmd) { | |
138 | ||
139 | case PTP_CLOCK_GETCAPS: | |
140 | memset(&caps, 0, sizeof(caps)); | |
141 | caps.max_adj = ptp->info->max_adj; | |
142 | caps.n_alarm = ptp->info->n_alarm; | |
143 | caps.n_ext_ts = ptp->info->n_ext_ts; | |
144 | caps.n_per_out = ptp->info->n_per_out; | |
145 | caps.pps = ptp->info->pps; | |
6092315d | 146 | caps.n_pins = ptp->info->n_pins; |
719f1aa4 | 147 | caps.cross_timestamping = ptp->info->getcrosststamp != NULL; |
e23ef227 DC |
148 | if (copy_to_user((void __user *)arg, &caps, sizeof(caps))) |
149 | err = -EFAULT; | |
d94ba80e RC |
150 | break; |
151 | ||
152 | case PTP_EXTTS_REQUEST: | |
153 | if (copy_from_user(&req.extts, (void __user *)arg, | |
154 | sizeof(req.extts))) { | |
155 | err = -EFAULT; | |
156 | break; | |
157 | } | |
158 | if (req.extts.index >= ops->n_ext_ts) { | |
159 | err = -EINVAL; | |
160 | break; | |
161 | } | |
162 | req.type = PTP_CLK_REQ_EXTTS; | |
163 | enable = req.extts.flags & PTP_ENABLE_FEATURE ? 1 : 0; | |
164 | err = ops->enable(ops, &req, enable); | |
165 | break; | |
166 | ||
167 | case PTP_PEROUT_REQUEST: | |
168 | if (copy_from_user(&req.perout, (void __user *)arg, | |
169 | sizeof(req.perout))) { | |
170 | err = -EFAULT; | |
171 | break; | |
172 | } | |
173 | if (req.perout.index >= ops->n_per_out) { | |
174 | err = -EINVAL; | |
175 | break; | |
176 | } | |
177 | req.type = PTP_CLK_REQ_PEROUT; | |
178 | enable = req.perout.period.sec || req.perout.period.nsec; | |
179 | err = ops->enable(ops, &req, enable); | |
180 | break; | |
181 | ||
182 | case PTP_ENABLE_PPS: | |
183 | if (!capable(CAP_SYS_TIME)) | |
184 | return -EPERM; | |
185 | req.type = PTP_CLK_REQ_PPS; | |
186 | enable = arg ? 1 : 0; | |
187 | err = ops->enable(ops, &req, enable); | |
188 | break; | |
189 | ||
719f1aa4 CH |
190 | case PTP_SYS_OFFSET_PRECISE: |
191 | if (!ptp->info->getcrosststamp) { | |
192 | err = -EOPNOTSUPP; | |
193 | break; | |
194 | } | |
195 | err = ptp->info->getcrosststamp(ptp->info, &xtstamp); | |
196 | if (err) | |
197 | break; | |
198 | ||
02a9079c | 199 | memset(&precise_offset, 0, sizeof(precise_offset)); |
719f1aa4 CH |
200 | ts = ktime_to_timespec64(xtstamp.device); |
201 | precise_offset.device.sec = ts.tv_sec; | |
202 | precise_offset.device.nsec = ts.tv_nsec; | |
203 | ts = ktime_to_timespec64(xtstamp.sys_realtime); | |
204 | precise_offset.sys_realtime.sec = ts.tv_sec; | |
205 | precise_offset.sys_realtime.nsec = ts.tv_nsec; | |
206 | ts = ktime_to_timespec64(xtstamp.sys_monoraw); | |
207 | precise_offset.sys_monoraw.sec = ts.tv_sec; | |
208 | precise_offset.sys_monoraw.nsec = ts.tv_nsec; | |
209 | if (copy_to_user((void __user *)arg, &precise_offset, | |
210 | sizeof(precise_offset))) | |
211 | err = -EFAULT; | |
212 | break; | |
213 | ||
215b13dd | 214 | case PTP_SYS_OFFSET: |
2ece068e MFW |
215 | sysoff = memdup_user((void __user *)arg, sizeof(*sysoff)); |
216 | if (IS_ERR(sysoff)) { | |
217 | err = PTR_ERR(sysoff); | |
6756325a | 218 | sysoff = NULL; |
215b13dd RC |
219 | break; |
220 | } | |
c3484c27 | 221 | if (sysoff->n_samples > PTP_MAX_SAMPLES) { |
215b13dd RC |
222 | err = -EINVAL; |
223 | break; | |
224 | } | |
c3484c27 RC |
225 | pct = &sysoff->ts[0]; |
226 | for (i = 0; i < sysoff->n_samples; i++) { | |
f696a21c | 227 | ktime_get_real_ts64(&ts); |
215b13dd RC |
228 | pct->sec = ts.tv_sec; |
229 | pct->nsec = ts.tv_nsec; | |
230 | pct++; | |
ed7c6317 | 231 | ptp->info->gettime64(ptp->info, &ts); |
215b13dd RC |
232 | pct->sec = ts.tv_sec; |
233 | pct->nsec = ts.tv_nsec; | |
234 | pct++; | |
235 | } | |
f696a21c | 236 | ktime_get_real_ts64(&ts); |
215b13dd RC |
237 | pct->sec = ts.tv_sec; |
238 | pct->nsec = ts.tv_nsec; | |
c3484c27 | 239 | if (copy_to_user((void __user *)arg, sysoff, sizeof(*sysoff))) |
215b13dd RC |
240 | err = -EFAULT; |
241 | break; | |
242 | ||
6092315d RC |
243 | case PTP_PIN_GETFUNC: |
244 | if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) { | |
245 | err = -EFAULT; | |
246 | break; | |
247 | } | |
248 | pin_index = pd.index; | |
249 | if (pin_index >= ops->n_pins) { | |
250 | err = -EINVAL; | |
251 | break; | |
252 | } | |
efa61c8c | 253 | pin_index = array_index_nospec(pin_index, ops->n_pins); |
6092315d RC |
254 | if (mutex_lock_interruptible(&ptp->pincfg_mux)) |
255 | return -ERESTARTSYS; | |
256 | pd = ops->pin_config[pin_index]; | |
257 | mutex_unlock(&ptp->pincfg_mux); | |
258 | if (!err && copy_to_user((void __user *)arg, &pd, sizeof(pd))) | |
259 | err = -EFAULT; | |
260 | break; | |
261 | ||
262 | case PTP_PIN_SETFUNC: | |
263 | if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) { | |
264 | err = -EFAULT; | |
265 | break; | |
266 | } | |
267 | pin_index = pd.index; | |
268 | if (pin_index >= ops->n_pins) { | |
269 | err = -EINVAL; | |
270 | break; | |
271 | } | |
efa61c8c | 272 | pin_index = array_index_nospec(pin_index, ops->n_pins); |
6092315d RC |
273 | if (mutex_lock_interruptible(&ptp->pincfg_mux)) |
274 | return -ERESTARTSYS; | |
275 | err = ptp_set_pinfunc(ptp, pin_index, pd.func, pd.chan); | |
276 | mutex_unlock(&ptp->pincfg_mux); | |
277 | break; | |
278 | ||
d94ba80e RC |
279 | default: |
280 | err = -ENOTTY; | |
281 | break; | |
282 | } | |
c3484c27 RC |
283 | |
284 | kfree(sysoff); | |
d94ba80e RC |
285 | return err; |
286 | } | |
287 | ||
afc9a42b | 288 | __poll_t ptp_poll(struct posix_clock *pc, struct file *fp, poll_table *wait) |
d94ba80e RC |
289 | { |
290 | struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); | |
291 | ||
292 | poll_wait(fp, &ptp->tsev_wq, wait); | |
293 | ||
a9a08845 | 294 | return queue_cnt(&ptp->tsevq) ? EPOLLIN : 0; |
d94ba80e RC |
295 | } |
296 | ||
c7ec0bad RC |
297 | #define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event)) |
298 | ||
d94ba80e RC |
299 | ssize_t ptp_read(struct posix_clock *pc, |
300 | uint rdflags, char __user *buf, size_t cnt) | |
301 | { | |
302 | struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); | |
303 | struct timestamp_event_queue *queue = &ptp->tsevq; | |
c7ec0bad | 304 | struct ptp_extts_event *event; |
d94ba80e RC |
305 | unsigned long flags; |
306 | size_t qcnt, i; | |
c7ec0bad | 307 | int result; |
d94ba80e RC |
308 | |
309 | if (cnt % sizeof(struct ptp_extts_event) != 0) | |
310 | return -EINVAL; | |
311 | ||
c7ec0bad RC |
312 | if (cnt > EXTTS_BUFSIZE) |
313 | cnt = EXTTS_BUFSIZE; | |
d94ba80e RC |
314 | |
315 | cnt = cnt / sizeof(struct ptp_extts_event); | |
316 | ||
317 | if (mutex_lock_interruptible(&ptp->tsevq_mux)) | |
318 | return -ERESTARTSYS; | |
319 | ||
320 | if (wait_event_interruptible(ptp->tsev_wq, | |
321 | ptp->defunct || queue_cnt(queue))) { | |
322 | mutex_unlock(&ptp->tsevq_mux); | |
323 | return -ERESTARTSYS; | |
324 | } | |
325 | ||
fb5a18cf DC |
326 | if (ptp->defunct) { |
327 | mutex_unlock(&ptp->tsevq_mux); | |
d94ba80e | 328 | return -ENODEV; |
fb5a18cf | 329 | } |
d94ba80e | 330 | |
c7ec0bad RC |
331 | event = kmalloc(EXTTS_BUFSIZE, GFP_KERNEL); |
332 | if (!event) { | |
333 | mutex_unlock(&ptp->tsevq_mux); | |
334 | return -ENOMEM; | |
335 | } | |
336 | ||
d94ba80e RC |
337 | spin_lock_irqsave(&queue->lock, flags); |
338 | ||
339 | qcnt = queue_cnt(queue); | |
340 | ||
341 | if (cnt > qcnt) | |
342 | cnt = qcnt; | |
343 | ||
344 | for (i = 0; i < cnt; i++) { | |
345 | event[i] = queue->buf[queue->head]; | |
346 | queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS; | |
347 | } | |
348 | ||
349 | spin_unlock_irqrestore(&queue->lock, flags); | |
350 | ||
351 | cnt = cnt * sizeof(struct ptp_extts_event); | |
352 | ||
353 | mutex_unlock(&ptp->tsevq_mux); | |
354 | ||
c7ec0bad | 355 | result = cnt; |
fb5a18cf | 356 | if (copy_to_user(buf, event, cnt)) |
c7ec0bad | 357 | result = -EFAULT; |
d94ba80e | 358 | |
c7ec0bad RC |
359 | kfree(event); |
360 | return result; | |
d94ba80e | 361 | } |