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