1d94ba80eSRichard Cochran /* 2d94ba80eSRichard Cochran * PTP 1588 clock support - character device implementation. 3d94ba80eSRichard Cochran * 4d94ba80eSRichard Cochran * Copyright (C) 2010 OMICRON electronics GmbH 5d94ba80eSRichard Cochran * 6d94ba80eSRichard Cochran * This program is free software; you can redistribute it and/or modify 7d94ba80eSRichard Cochran * it under the terms of the GNU General Public License as published by 8d94ba80eSRichard Cochran * the Free Software Foundation; either version 2 of the License, or 9d94ba80eSRichard Cochran * (at your option) any later version. 10d94ba80eSRichard Cochran * 11d94ba80eSRichard Cochran * This program is distributed in the hope that it will be useful, 12d94ba80eSRichard Cochran * but WITHOUT ANY WARRANTY; without even the implied warranty of 13d94ba80eSRichard Cochran * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14d94ba80eSRichard Cochran * GNU General Public License for more details. 15d94ba80eSRichard Cochran * 16d94ba80eSRichard Cochran * You should have received a copy of the GNU General Public License 17d94ba80eSRichard Cochran * along with this program; if not, write to the Free Software 18d94ba80eSRichard Cochran * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 19d94ba80eSRichard Cochran */ 20d94ba80eSRichard Cochran #include <linux/module.h> 21d94ba80eSRichard Cochran #include <linux/posix-clock.h> 22d94ba80eSRichard Cochran #include <linux/poll.h> 23d94ba80eSRichard Cochran #include <linux/sched.h> 24c7ec0badSRichard Cochran #include <linux/slab.h> 25d94ba80eSRichard Cochran 26d94ba80eSRichard Cochran #include "ptp_private.h" 27d94ba80eSRichard Cochran 286092315dSRichard Cochran static int ptp_disable_pinfunc(struct ptp_clock_info *ops, 296092315dSRichard Cochran enum ptp_pin_function func, unsigned int chan) 306092315dSRichard Cochran { 316092315dSRichard Cochran struct ptp_clock_request rq; 326092315dSRichard Cochran int err = 0; 336092315dSRichard Cochran 346092315dSRichard Cochran memset(&rq, 0, sizeof(rq)); 356092315dSRichard Cochran 366092315dSRichard Cochran switch (func) { 376092315dSRichard Cochran case PTP_PF_NONE: 386092315dSRichard Cochran break; 396092315dSRichard Cochran case PTP_PF_EXTTS: 406092315dSRichard Cochran rq.type = PTP_CLK_REQ_EXTTS; 416092315dSRichard Cochran rq.extts.index = chan; 426092315dSRichard Cochran err = ops->enable(ops, &rq, 0); 436092315dSRichard Cochran break; 446092315dSRichard Cochran case PTP_PF_PEROUT: 456092315dSRichard Cochran rq.type = PTP_CLK_REQ_PEROUT; 466092315dSRichard Cochran rq.perout.index = chan; 476092315dSRichard Cochran err = ops->enable(ops, &rq, 0); 486092315dSRichard Cochran break; 496092315dSRichard Cochran case PTP_PF_PHYSYNC: 506092315dSRichard Cochran break; 516092315dSRichard Cochran default: 526092315dSRichard Cochran return -EINVAL; 536092315dSRichard Cochran } 546092315dSRichard Cochran 556092315dSRichard Cochran return err; 566092315dSRichard Cochran } 576092315dSRichard Cochran 586092315dSRichard Cochran int ptp_set_pinfunc(struct ptp_clock *ptp, unsigned int pin, 596092315dSRichard Cochran enum ptp_pin_function func, unsigned int chan) 606092315dSRichard Cochran { 616092315dSRichard Cochran struct ptp_clock_info *info = ptp->info; 626092315dSRichard Cochran struct ptp_pin_desc *pin1 = NULL, *pin2 = &info->pin_config[pin]; 636092315dSRichard Cochran unsigned int i; 646092315dSRichard Cochran 656092315dSRichard Cochran /* Check to see if any other pin previously had this function. */ 666092315dSRichard Cochran for (i = 0; i < info->n_pins; i++) { 676092315dSRichard Cochran if (info->pin_config[i].func == func && 686092315dSRichard Cochran info->pin_config[i].chan == chan) { 696092315dSRichard Cochran pin1 = &info->pin_config[i]; 706092315dSRichard Cochran break; 716092315dSRichard Cochran } 726092315dSRichard Cochran } 736092315dSRichard Cochran if (pin1 && i == pin) 746092315dSRichard Cochran return 0; 756092315dSRichard Cochran 766092315dSRichard Cochran /* Check the desired function and channel. */ 776092315dSRichard Cochran switch (func) { 786092315dSRichard Cochran case PTP_PF_NONE: 796092315dSRichard Cochran break; 806092315dSRichard Cochran case PTP_PF_EXTTS: 816092315dSRichard Cochran if (chan >= info->n_ext_ts) 826092315dSRichard Cochran return -EINVAL; 836092315dSRichard Cochran break; 846092315dSRichard Cochran case PTP_PF_PEROUT: 856092315dSRichard Cochran if (chan >= info->n_per_out) 866092315dSRichard Cochran return -EINVAL; 876092315dSRichard Cochran break; 886092315dSRichard Cochran case PTP_PF_PHYSYNC: 8972df7a72SStefan Sørensen if (chan != 0) 906092315dSRichard Cochran return -EINVAL; 916092315dSRichard Cochran default: 926092315dSRichard Cochran return -EINVAL; 936092315dSRichard Cochran } 946092315dSRichard Cochran 956092315dSRichard Cochran if (info->verify(info, pin, func, chan)) { 966092315dSRichard Cochran pr_err("driver cannot use function %u on pin %u\n", func, chan); 976092315dSRichard Cochran return -EOPNOTSUPP; 986092315dSRichard Cochran } 996092315dSRichard Cochran 1006092315dSRichard Cochran /* Disable whatever function was previously assigned. */ 1016092315dSRichard Cochran if (pin1) { 1026092315dSRichard Cochran ptp_disable_pinfunc(info, func, chan); 1036092315dSRichard Cochran pin1->func = PTP_PF_NONE; 1046092315dSRichard Cochran pin1->chan = 0; 1056092315dSRichard Cochran } 1066092315dSRichard Cochran ptp_disable_pinfunc(info, pin2->func, pin2->chan); 1076092315dSRichard Cochran pin2->func = func; 1086092315dSRichard Cochran pin2->chan = chan; 1096092315dSRichard Cochran 1106092315dSRichard Cochran return 0; 1116092315dSRichard Cochran } 1126092315dSRichard Cochran 113d94ba80eSRichard Cochran int ptp_open(struct posix_clock *pc, fmode_t fmode) 114d94ba80eSRichard Cochran { 115d94ba80eSRichard Cochran return 0; 116d94ba80eSRichard Cochran } 117d94ba80eSRichard Cochran 118d94ba80eSRichard Cochran long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg) 119d94ba80eSRichard Cochran { 120d94ba80eSRichard Cochran struct ptp_clock_caps caps; 121d94ba80eSRichard Cochran struct ptp_clock_request req; 122c3484c27SRichard Cochran struct ptp_sys_offset *sysoff = NULL; 1236092315dSRichard Cochran struct ptp_pin_desc pd; 124d94ba80eSRichard Cochran struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); 125d94ba80eSRichard Cochran struct ptp_clock_info *ops = ptp->info; 126215b13ddSRichard Cochran struct ptp_clock_time *pct; 127e13cfcb0SRichard Cochran struct timespec64 ts; 128e13cfcb0SRichard Cochran struct timespec t2; 129d94ba80eSRichard Cochran int enable, err = 0; 1306092315dSRichard Cochran unsigned int i, pin_index; 131d94ba80eSRichard Cochran 132d94ba80eSRichard Cochran switch (cmd) { 133d94ba80eSRichard Cochran 134d94ba80eSRichard Cochran case PTP_CLOCK_GETCAPS: 135d94ba80eSRichard Cochran memset(&caps, 0, sizeof(caps)); 136d94ba80eSRichard Cochran caps.max_adj = ptp->info->max_adj; 137d94ba80eSRichard Cochran caps.n_alarm = ptp->info->n_alarm; 138d94ba80eSRichard Cochran caps.n_ext_ts = ptp->info->n_ext_ts; 139d94ba80eSRichard Cochran caps.n_per_out = ptp->info->n_per_out; 140d94ba80eSRichard Cochran caps.pps = ptp->info->pps; 1416092315dSRichard Cochran caps.n_pins = ptp->info->n_pins; 142e23ef227SDan Carpenter if (copy_to_user((void __user *)arg, &caps, sizeof(caps))) 143e23ef227SDan Carpenter err = -EFAULT; 144d94ba80eSRichard Cochran break; 145d94ba80eSRichard Cochran 146d94ba80eSRichard Cochran case PTP_EXTTS_REQUEST: 147d94ba80eSRichard Cochran if (copy_from_user(&req.extts, (void __user *)arg, 148d94ba80eSRichard Cochran sizeof(req.extts))) { 149d94ba80eSRichard Cochran err = -EFAULT; 150d94ba80eSRichard Cochran break; 151d94ba80eSRichard Cochran } 152d94ba80eSRichard Cochran if (req.extts.index >= ops->n_ext_ts) { 153d94ba80eSRichard Cochran err = -EINVAL; 154d94ba80eSRichard Cochran break; 155d94ba80eSRichard Cochran } 156d94ba80eSRichard Cochran req.type = PTP_CLK_REQ_EXTTS; 157d94ba80eSRichard Cochran enable = req.extts.flags & PTP_ENABLE_FEATURE ? 1 : 0; 158d94ba80eSRichard Cochran err = ops->enable(ops, &req, enable); 159d94ba80eSRichard Cochran break; 160d94ba80eSRichard Cochran 161d94ba80eSRichard Cochran case PTP_PEROUT_REQUEST: 162d94ba80eSRichard Cochran if (copy_from_user(&req.perout, (void __user *)arg, 163d94ba80eSRichard Cochran sizeof(req.perout))) { 164d94ba80eSRichard Cochran err = -EFAULT; 165d94ba80eSRichard Cochran break; 166d94ba80eSRichard Cochran } 167d94ba80eSRichard Cochran if (req.perout.index >= ops->n_per_out) { 168d94ba80eSRichard Cochran err = -EINVAL; 169d94ba80eSRichard Cochran break; 170d94ba80eSRichard Cochran } 171d94ba80eSRichard Cochran req.type = PTP_CLK_REQ_PEROUT; 172d94ba80eSRichard Cochran enable = req.perout.period.sec || req.perout.period.nsec; 173d94ba80eSRichard Cochran err = ops->enable(ops, &req, enable); 174d94ba80eSRichard Cochran break; 175d94ba80eSRichard Cochran 176d94ba80eSRichard Cochran case PTP_ENABLE_PPS: 177d94ba80eSRichard Cochran if (!capable(CAP_SYS_TIME)) 178d94ba80eSRichard Cochran return -EPERM; 179d94ba80eSRichard Cochran req.type = PTP_CLK_REQ_PPS; 180d94ba80eSRichard Cochran enable = arg ? 1 : 0; 181d94ba80eSRichard Cochran err = ops->enable(ops, &req, enable); 182d94ba80eSRichard Cochran break; 183d94ba80eSRichard Cochran 184215b13ddSRichard Cochran case PTP_SYS_OFFSET: 185c3484c27SRichard Cochran sysoff = kmalloc(sizeof(*sysoff), GFP_KERNEL); 186c3484c27SRichard Cochran if (!sysoff) { 187c3484c27SRichard Cochran err = -ENOMEM; 188c3484c27SRichard Cochran break; 189c3484c27SRichard Cochran } 190c3484c27SRichard Cochran if (copy_from_user(sysoff, (void __user *)arg, 191c3484c27SRichard Cochran sizeof(*sysoff))) { 192215b13ddSRichard Cochran err = -EFAULT; 193215b13ddSRichard Cochran break; 194215b13ddSRichard Cochran } 195c3484c27SRichard Cochran if (sysoff->n_samples > PTP_MAX_SAMPLES) { 196215b13ddSRichard Cochran err = -EINVAL; 197215b13ddSRichard Cochran break; 198215b13ddSRichard Cochran } 199c3484c27SRichard Cochran pct = &sysoff->ts[0]; 200c3484c27SRichard Cochran for (i = 0; i < sysoff->n_samples; i++) { 201e13cfcb0SRichard Cochran getnstimeofday64(&ts); 202215b13ddSRichard Cochran pct->sec = ts.tv_sec; 203215b13ddSRichard Cochran pct->nsec = ts.tv_nsec; 204215b13ddSRichard Cochran pct++; 205e13cfcb0SRichard Cochran if (ptp->info->gettime64) { 206e13cfcb0SRichard Cochran ptp->info->gettime64(ptp->info, &ts); 207e13cfcb0SRichard Cochran } else { 208e13cfcb0SRichard Cochran ptp->info->gettime(ptp->info, &t2); 209e13cfcb0SRichard Cochran ts = timespec_to_timespec64(t2); 210e13cfcb0SRichard Cochran } 211215b13ddSRichard Cochran pct->sec = ts.tv_sec; 212215b13ddSRichard Cochran pct->nsec = ts.tv_nsec; 213215b13ddSRichard Cochran pct++; 214215b13ddSRichard Cochran } 215e13cfcb0SRichard Cochran getnstimeofday64(&ts); 216215b13ddSRichard Cochran pct->sec = ts.tv_sec; 217215b13ddSRichard Cochran pct->nsec = ts.tv_nsec; 218c3484c27SRichard Cochran if (copy_to_user((void __user *)arg, sysoff, sizeof(*sysoff))) 219215b13ddSRichard Cochran err = -EFAULT; 220215b13ddSRichard Cochran break; 221215b13ddSRichard Cochran 2226092315dSRichard Cochran case PTP_PIN_GETFUNC: 2236092315dSRichard Cochran if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) { 2246092315dSRichard Cochran err = -EFAULT; 2256092315dSRichard Cochran break; 2266092315dSRichard Cochran } 2276092315dSRichard Cochran pin_index = pd.index; 2286092315dSRichard Cochran if (pin_index >= ops->n_pins) { 2296092315dSRichard Cochran err = -EINVAL; 2306092315dSRichard Cochran break; 2316092315dSRichard Cochran } 2326092315dSRichard Cochran if (mutex_lock_interruptible(&ptp->pincfg_mux)) 2336092315dSRichard Cochran return -ERESTARTSYS; 2346092315dSRichard Cochran pd = ops->pin_config[pin_index]; 2356092315dSRichard Cochran mutex_unlock(&ptp->pincfg_mux); 2366092315dSRichard Cochran if (!err && copy_to_user((void __user *)arg, &pd, sizeof(pd))) 2376092315dSRichard Cochran err = -EFAULT; 2386092315dSRichard Cochran break; 2396092315dSRichard Cochran 2406092315dSRichard Cochran case PTP_PIN_SETFUNC: 2416092315dSRichard Cochran if (copy_from_user(&pd, (void __user *)arg, sizeof(pd))) { 2426092315dSRichard Cochran err = -EFAULT; 2436092315dSRichard Cochran break; 2446092315dSRichard Cochran } 2456092315dSRichard Cochran pin_index = pd.index; 2466092315dSRichard Cochran if (pin_index >= ops->n_pins) { 2476092315dSRichard Cochran err = -EINVAL; 2486092315dSRichard Cochran break; 2496092315dSRichard Cochran } 2506092315dSRichard Cochran if (mutex_lock_interruptible(&ptp->pincfg_mux)) 2516092315dSRichard Cochran return -ERESTARTSYS; 2526092315dSRichard Cochran err = ptp_set_pinfunc(ptp, pin_index, pd.func, pd.chan); 2536092315dSRichard Cochran mutex_unlock(&ptp->pincfg_mux); 2546092315dSRichard Cochran break; 2556092315dSRichard Cochran 256d94ba80eSRichard Cochran default: 257d94ba80eSRichard Cochran err = -ENOTTY; 258d94ba80eSRichard Cochran break; 259d94ba80eSRichard Cochran } 260c3484c27SRichard Cochran 261c3484c27SRichard Cochran kfree(sysoff); 262d94ba80eSRichard Cochran return err; 263d94ba80eSRichard Cochran } 264d94ba80eSRichard Cochran 265d94ba80eSRichard Cochran unsigned int ptp_poll(struct posix_clock *pc, struct file *fp, poll_table *wait) 266d94ba80eSRichard Cochran { 267d94ba80eSRichard Cochran struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); 268d94ba80eSRichard Cochran 269d94ba80eSRichard Cochran poll_wait(fp, &ptp->tsev_wq, wait); 270d94ba80eSRichard Cochran 271d94ba80eSRichard Cochran return queue_cnt(&ptp->tsevq) ? POLLIN : 0; 272d94ba80eSRichard Cochran } 273d94ba80eSRichard Cochran 274c7ec0badSRichard Cochran #define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event)) 275c7ec0badSRichard Cochran 276d94ba80eSRichard Cochran ssize_t ptp_read(struct posix_clock *pc, 277d94ba80eSRichard Cochran uint rdflags, char __user *buf, size_t cnt) 278d94ba80eSRichard Cochran { 279d94ba80eSRichard Cochran struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock); 280d94ba80eSRichard Cochran struct timestamp_event_queue *queue = &ptp->tsevq; 281c7ec0badSRichard Cochran struct ptp_extts_event *event; 282d94ba80eSRichard Cochran unsigned long flags; 283d94ba80eSRichard Cochran size_t qcnt, i; 284c7ec0badSRichard Cochran int result; 285d94ba80eSRichard Cochran 286d94ba80eSRichard Cochran if (cnt % sizeof(struct ptp_extts_event) != 0) 287d94ba80eSRichard Cochran return -EINVAL; 288d94ba80eSRichard Cochran 289c7ec0badSRichard Cochran if (cnt > EXTTS_BUFSIZE) 290c7ec0badSRichard Cochran cnt = EXTTS_BUFSIZE; 291d94ba80eSRichard Cochran 292d94ba80eSRichard Cochran cnt = cnt / sizeof(struct ptp_extts_event); 293d94ba80eSRichard Cochran 294d94ba80eSRichard Cochran if (mutex_lock_interruptible(&ptp->tsevq_mux)) 295d94ba80eSRichard Cochran return -ERESTARTSYS; 296d94ba80eSRichard Cochran 297d94ba80eSRichard Cochran if (wait_event_interruptible(ptp->tsev_wq, 298d94ba80eSRichard Cochran ptp->defunct || queue_cnt(queue))) { 299d94ba80eSRichard Cochran mutex_unlock(&ptp->tsevq_mux); 300d94ba80eSRichard Cochran return -ERESTARTSYS; 301d94ba80eSRichard Cochran } 302d94ba80eSRichard Cochran 303fb5a18cfSDan Carpenter if (ptp->defunct) { 304fb5a18cfSDan Carpenter mutex_unlock(&ptp->tsevq_mux); 305d94ba80eSRichard Cochran return -ENODEV; 306fb5a18cfSDan Carpenter } 307d94ba80eSRichard Cochran 308c7ec0badSRichard Cochran event = kmalloc(EXTTS_BUFSIZE, GFP_KERNEL); 309c7ec0badSRichard Cochran if (!event) { 310c7ec0badSRichard Cochran mutex_unlock(&ptp->tsevq_mux); 311c7ec0badSRichard Cochran return -ENOMEM; 312c7ec0badSRichard Cochran } 313c7ec0badSRichard Cochran 314d94ba80eSRichard Cochran spin_lock_irqsave(&queue->lock, flags); 315d94ba80eSRichard Cochran 316d94ba80eSRichard Cochran qcnt = queue_cnt(queue); 317d94ba80eSRichard Cochran 318d94ba80eSRichard Cochran if (cnt > qcnt) 319d94ba80eSRichard Cochran cnt = qcnt; 320d94ba80eSRichard Cochran 321d94ba80eSRichard Cochran for (i = 0; i < cnt; i++) { 322d94ba80eSRichard Cochran event[i] = queue->buf[queue->head]; 323d94ba80eSRichard Cochran queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS; 324d94ba80eSRichard Cochran } 325d94ba80eSRichard Cochran 326d94ba80eSRichard Cochran spin_unlock_irqrestore(&queue->lock, flags); 327d94ba80eSRichard Cochran 328d94ba80eSRichard Cochran cnt = cnt * sizeof(struct ptp_extts_event); 329d94ba80eSRichard Cochran 330d94ba80eSRichard Cochran mutex_unlock(&ptp->tsevq_mux); 331d94ba80eSRichard Cochran 332c7ec0badSRichard Cochran result = cnt; 333fb5a18cfSDan Carpenter if (copy_to_user(buf, event, cnt)) 334c7ec0badSRichard Cochran result = -EFAULT; 335d94ba80eSRichard Cochran 336c7ec0badSRichard Cochran kfree(event); 337c7ec0badSRichard Cochran return result; 338d94ba80eSRichard Cochran } 339