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> 24 #include <linux/slab.h> 25 #include <linux/timekeeping.h> 26 27 #include "ptp_private.h" 28 29 static int ptp_disable_pinfunc(struct ptp_clock_info *ops, 30 enum ptp_pin_function func, unsigned int chan) 31 { 32 struct ptp_clock_request rq; 33 int err = 0; 34 35 memset(&rq, 0, sizeof(rq)); 36 37 switch (func) { 38 case PTP_PF_NONE: 39 break; 40 case PTP_PF_EXTTS: 41 rq.type = PTP_CLK_REQ_EXTTS; 42 rq.extts.index = chan; 43 err = ops->enable(ops, &rq, 0); 44 break; 45 case PTP_PF_PEROUT: 46 rq.type = PTP_CLK_REQ_PEROUT; 47 rq.perout.index = chan; 48 err = ops->enable(ops, &rq, 0); 49 break; 50 case PTP_PF_PHYSYNC: 51 break; 52 default: 53 return -EINVAL; 54 } 55 56 return err; 57 } 58 59 int ptp_set_pinfunc(struct ptp_clock *ptp, unsigned int pin, 60 enum ptp_pin_function func, unsigned int chan) 61 { 62 struct ptp_clock_info *info = ptp->info; 63 struct ptp_pin_desc *pin1 = NULL, *pin2 = &info->pin_config[pin]; 64 unsigned int i; 65 66 /* Check to see if any other pin previously had this function. */ 67 for (i = 0; i < info->n_pins; i++) { 68 if (info->pin_config[i].func == func && 69 info->pin_config[i].chan == chan) { 70 pin1 = &info->pin_config[i]; 71 break; 72 } 73 } 74 if (pin1 && i == pin) 75 return 0; 76 77 /* Check the desired function and channel. */ 78 switch (func) { 79 case PTP_PF_NONE: 80 break; 81 case PTP_PF_EXTTS: 82 if (chan >= info->n_ext_ts) 83 return -EINVAL; 84 break; 85 case PTP_PF_PEROUT: 86 if (chan >= info->n_per_out) 87 return -EINVAL; 88 break; 89 case PTP_PF_PHYSYNC: 90 if (chan != 0) 91 return -EINVAL; 92 default: 93 return -EINVAL; 94 } 95 96 if (info->verify(info, pin, func, chan)) { 97 pr_err("driver cannot use function %u on pin %u\n", func, chan); 98 return -EOPNOTSUPP; 99 } 100 101 /* Disable whatever function was previously assigned. */ 102 if (pin1) { 103 ptp_disable_pinfunc(info, func, chan); 104 pin1->func = PTP_PF_NONE; 105 pin1->chan = 0; 106 } 107 ptp_disable_pinfunc(info, pin2->func, pin2->chan); 108 pin2->func = func; 109 pin2->chan = chan; 110 111 return 0; 112 } 113 114 int ptp_open(struct posix_clock *pc, fmode_t fmode) 115 { 116 return 0; 117 } 118 119 long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg) 120 { 121 struct ptp_clock_caps caps; 122 struct ptp_clock_request req; 123 struct ptp_sys_offset *sysoff = NULL; 124 struct ptp_sys_offset_precise precise_offset; 125 struct ptp_pin_desc pd; 126 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); 127 struct ptp_clock_info *ops = ptp->info; 128 struct ptp_clock_time *pct; 129 struct timespec64 ts; 130 struct system_device_crosststamp xtstamp; 131 int enable, err = 0; 132 unsigned int i, pin_index; 133 134 switch (cmd) { 135 136 case PTP_CLOCK_GETCAPS: 137 memset(&caps, 0, sizeof(caps)); 138 caps.max_adj = ptp->info->max_adj; 139 caps.n_alarm = ptp->info->n_alarm; 140 caps.n_ext_ts = ptp->info->n_ext_ts; 141 caps.n_per_out = ptp->info->n_per_out; 142 caps.pps = ptp->info->pps; 143 caps.n_pins = ptp->info->n_pins; 144 caps.cross_timestamping = ptp->info->getcrosststamp != NULL; 145 if (copy_to_user((void __user *)arg, &caps, sizeof(caps))) 146 err = -EFAULT; 147 break; 148 149 case PTP_EXTTS_REQUEST: 150 if (copy_from_user(&req.extts, (void __user *)arg, 151 sizeof(req.extts))) { 152 err = -EFAULT; 153 break; 154 } 155 if (req.extts.index >= ops->n_ext_ts) { 156 err = -EINVAL; 157 break; 158 } 159 req.type = PTP_CLK_REQ_EXTTS; 160 enable = req.extts.flags & PTP_ENABLE_FEATURE ? 1 : 0; 161 err = ops->enable(ops, &req, enable); 162 break; 163 164 case PTP_PEROUT_REQUEST: 165 if (copy_from_user(&req.perout, (void __user *)arg, 166 sizeof(req.perout))) { 167 err = -EFAULT; 168 break; 169 } 170 if (req.perout.index >= ops->n_per_out) { 171 err = -EINVAL; 172 break; 173 } 174 req.type = PTP_CLK_REQ_PEROUT; 175 enable = req.perout.period.sec || req.perout.period.nsec; 176 err = ops->enable(ops, &req, enable); 177 break; 178 179 case PTP_ENABLE_PPS: 180 if (!capable(CAP_SYS_TIME)) 181 return -EPERM; 182 req.type = PTP_CLK_REQ_PPS; 183 enable = arg ? 1 : 0; 184 err = ops->enable(ops, &req, enable); 185 break; 186 187 case PTP_SYS_OFFSET_PRECISE: 188 if (!ptp->info->getcrosststamp) { 189 err = -EOPNOTSUPP; 190 break; 191 } 192 err = ptp->info->getcrosststamp(ptp->info, &xtstamp); 193 if (err) 194 break; 195 196 ts = ktime_to_timespec64(xtstamp.device); 197 precise_offset.device.sec = ts.tv_sec; 198 precise_offset.device.nsec = ts.tv_nsec; 199 ts = ktime_to_timespec64(xtstamp.sys_realtime); 200 precise_offset.sys_realtime.sec = ts.tv_sec; 201 precise_offset.sys_realtime.nsec = ts.tv_nsec; 202 ts = ktime_to_timespec64(xtstamp.sys_monoraw); 203 precise_offset.sys_monoraw.sec = ts.tv_sec; 204 precise_offset.sys_monoraw.nsec = ts.tv_nsec; 205 if (copy_to_user((void __user *)arg, &precise_offset, 206 sizeof(precise_offset))) 207 err = -EFAULT; 208 break; 209 210 case PTP_SYS_OFFSET: 211 sysoff = memdup_user((void __user *)arg, sizeof(*sysoff)); 212 if (IS_ERR(sysoff)) { 213 err = PTR_ERR(sysoff); 214 sysoff = NULL; 215 break; 216 } 217 if (sysoff->n_samples > PTP_MAX_SAMPLES) { 218 err = -EINVAL; 219 break; 220 } 221 pct = &sysoff->ts[0]; 222 for (i = 0; i < sysoff->n_samples; i++) { 223 getnstimeofday64(&ts); 224 pct->sec = ts.tv_sec; 225 pct->nsec = ts.tv_nsec; 226 pct++; 227 ptp->info->gettime64(ptp->info, &ts); 228 pct->sec = ts.tv_sec; 229 pct->nsec = ts.tv_nsec; 230 pct++; 231 } 232 getnstimeofday64(&ts); 233 pct->sec = ts.tv_sec; 234 pct->nsec = ts.tv_nsec; 235 if (copy_to_user((void __user *)arg, sysoff, sizeof(*sysoff))) 236 err = -EFAULT; 237 break; 238 239 case PTP_PIN_GETFUNC: 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 pd = ops->pin_config[pin_index]; 252 mutex_unlock(&ptp->pincfg_mux); 253 if (!err && copy_to_user((void __user *)arg, &pd, sizeof(pd))) 254 err = -EFAULT; 255 break; 256 257 case PTP_PIN_SETFUNC: 258 if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) { 259 err = -EFAULT; 260 break; 261 } 262 pin_index = pd.index; 263 if (pin_index >= ops->n_pins) { 264 err = -EINVAL; 265 break; 266 } 267 if (mutex_lock_interruptible(&ptp->pincfg_mux)) 268 return -ERESTARTSYS; 269 err = ptp_set_pinfunc(ptp, pin_index, pd.func, pd.chan); 270 mutex_unlock(&ptp->pincfg_mux); 271 break; 272 273 default: 274 err = -ENOTTY; 275 break; 276 } 277 278 kfree(sysoff); 279 return err; 280 } 281 282 unsigned int ptp_poll(struct posix_clock *pc, struct file *fp, poll_table *wait) 283 { 284 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); 285 286 poll_wait(fp, &ptp->tsev_wq, wait); 287 288 return queue_cnt(&ptp->tsevq) ? POLLIN : 0; 289 } 290 291 #define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event)) 292 293 ssize_t ptp_read(struct posix_clock *pc, 294 uint rdflags, char __user *buf, size_t cnt) 295 { 296 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); 297 struct timestamp_event_queue *queue = &ptp->tsevq; 298 struct ptp_extts_event *event; 299 unsigned long flags; 300 size_t qcnt, i; 301 int result; 302 303 if (cnt % sizeof(struct ptp_extts_event) != 0) 304 return -EINVAL; 305 306 if (cnt > EXTTS_BUFSIZE) 307 cnt = EXTTS_BUFSIZE; 308 309 cnt = cnt / sizeof(struct ptp_extts_event); 310 311 if (mutex_lock_interruptible(&ptp->tsevq_mux)) 312 return -ERESTARTSYS; 313 314 if (wait_event_interruptible(ptp->tsev_wq, 315 ptp->defunct || queue_cnt(queue))) { 316 mutex_unlock(&ptp->tsevq_mux); 317 return -ERESTARTSYS; 318 } 319 320 if (ptp->defunct) { 321 mutex_unlock(&ptp->tsevq_mux); 322 return -ENODEV; 323 } 324 325 event = kmalloc(EXTTS_BUFSIZE, GFP_KERNEL); 326 if (!event) { 327 mutex_unlock(&ptp->tsevq_mux); 328 return -ENOMEM; 329 } 330 331 spin_lock_irqsave(&queue->lock, flags); 332 333 qcnt = queue_cnt(queue); 334 335 if (cnt > qcnt) 336 cnt = qcnt; 337 338 for (i = 0; i < cnt; i++) { 339 event[i] = queue->buf[queue->head]; 340 queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS; 341 } 342 343 spin_unlock_irqrestore(&queue->lock, flags); 344 345 cnt = cnt * sizeof(struct ptp_extts_event); 346 347 mutex_unlock(&ptp->tsevq_mux); 348 349 result = cnt; 350 if (copy_to_user(buf, event, cnt)) 351 result = -EFAULT; 352 353 kfree(event); 354 return result; 355 } 356