123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466 |
- // SPDX-License-Identifier: GPL-2.0-or-later
- /*
- * PTP 1588 clock support - sysfs interface.
- *
- * Copyright (C) 2010 OMICRON electronics GmbH
- * Copyright 2021 NXP
- */
- #include <linux/capability.h>
- #include <linux/slab.h>
- #include "ptp_private.h"
- static ssize_t clock_name_show(struct device *dev,
- struct device_attribute *attr, char *page)
- {
- struct ptp_clock *ptp = dev_get_drvdata(dev);
- return sysfs_emit(page, "%s\n", ptp->info->name);
- }
- static DEVICE_ATTR_RO(clock_name);
- #define PTP_SHOW_INT(name, var) \
- static ssize_t var##_show(struct device *dev, \
- struct device_attribute *attr, char *page) \
- { \
- struct ptp_clock *ptp = dev_get_drvdata(dev); \
- return snprintf(page, PAGE_SIZE-1, "%d\n", ptp->info->var); \
- } \
- static DEVICE_ATTR(name, 0444, var##_show, NULL);
- PTP_SHOW_INT(max_adjustment, max_adj);
- PTP_SHOW_INT(n_alarms, n_alarm);
- PTP_SHOW_INT(n_external_timestamps, n_ext_ts);
- PTP_SHOW_INT(n_periodic_outputs, n_per_out);
- PTP_SHOW_INT(n_programmable_pins, n_pins);
- PTP_SHOW_INT(pps_available, pps);
- static ssize_t extts_enable_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
- {
- struct ptp_clock *ptp = dev_get_drvdata(dev);
- struct ptp_clock_info *ops = ptp->info;
- struct ptp_clock_request req = { .type = PTP_CLK_REQ_EXTTS };
- int cnt, enable;
- int err = -EINVAL;
- cnt = sscanf(buf, "%u %d", &req.extts.index, &enable);
- if (cnt != 2)
- goto out;
- if (req.extts.index >= ops->n_ext_ts)
- goto out;
- err = ops->enable(ops, &req, enable ? 1 : 0);
- if (err)
- goto out;
- return count;
- out:
- return err;
- }
- static DEVICE_ATTR(extts_enable, 0220, NULL, extts_enable_store);
- static ssize_t extts_fifo_show(struct device *dev,
- struct device_attribute *attr, char *page)
- {
- struct ptp_clock *ptp = dev_get_drvdata(dev);
- struct timestamp_event_queue *queue = &ptp->tsevq;
- struct ptp_extts_event event;
- unsigned long flags;
- size_t qcnt;
- int cnt = 0;
- memset(&event, 0, sizeof(event));
- if (mutex_lock_interruptible(&ptp->tsevq_mux))
- return -ERESTARTSYS;
- spin_lock_irqsave(&queue->lock, flags);
- qcnt = queue_cnt(queue);
- if (qcnt) {
- event = queue->buf[queue->head];
- /* Paired with READ_ONCE() in queue_cnt() */
- WRITE_ONCE(queue->head, (queue->head + 1) % PTP_MAX_TIMESTAMPS);
- }
- spin_unlock_irqrestore(&queue->lock, flags);
- if (!qcnt)
- goto out;
- cnt = snprintf(page, PAGE_SIZE, "%u %lld %u\n",
- event.index, event.t.sec, event.t.nsec);
- out:
- mutex_unlock(&ptp->tsevq_mux);
- return cnt;
- }
- static DEVICE_ATTR(fifo, 0444, extts_fifo_show, NULL);
- static ssize_t period_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
- {
- struct ptp_clock *ptp = dev_get_drvdata(dev);
- struct ptp_clock_info *ops = ptp->info;
- struct ptp_clock_request req = { .type = PTP_CLK_REQ_PEROUT };
- int cnt, enable, err = -EINVAL;
- cnt = sscanf(buf, "%u %lld %u %lld %u", &req.perout.index,
- &req.perout.start.sec, &req.perout.start.nsec,
- &req.perout.period.sec, &req.perout.period.nsec);
- if (cnt != 5)
- goto out;
- if (req.perout.index >= ops->n_per_out)
- goto out;
- enable = req.perout.period.sec || req.perout.period.nsec;
- err = ops->enable(ops, &req, enable);
- if (err)
- goto out;
- return count;
- out:
- return err;
- }
- static DEVICE_ATTR(period, 0220, NULL, period_store);
- static ssize_t pps_enable_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
- {
- struct ptp_clock *ptp = dev_get_drvdata(dev);
- struct ptp_clock_info *ops = ptp->info;
- struct ptp_clock_request req = { .type = PTP_CLK_REQ_PPS };
- int cnt, enable;
- int err = -EINVAL;
- if (!capable(CAP_SYS_TIME))
- return -EPERM;
- cnt = sscanf(buf, "%d", &enable);
- if (cnt != 1)
- goto out;
- err = ops->enable(ops, &req, enable ? 1 : 0);
- if (err)
- goto out;
- return count;
- out:
- return err;
- }
- static DEVICE_ATTR(pps_enable, 0220, NULL, pps_enable_store);
- static int unregister_vclock(struct device *dev, void *data)
- {
- struct ptp_clock *ptp = dev_get_drvdata(dev);
- struct ptp_clock_info *info = ptp->info;
- struct ptp_vclock *vclock;
- u32 *num = data;
- vclock = info_to_vclock(info);
- dev_info(dev->parent, "delete virtual clock ptp%d\n",
- vclock->clock->index);
- ptp_vclock_unregister(vclock);
- (*num)--;
- /* For break. Not error. */
- if (*num == 0)
- return -EINVAL;
- return 0;
- }
- static ssize_t n_vclocks_show(struct device *dev,
- struct device_attribute *attr, char *page)
- {
- struct ptp_clock *ptp = dev_get_drvdata(dev);
- ssize_t size;
- if (mutex_lock_interruptible(&ptp->n_vclocks_mux))
- return -ERESTARTSYS;
- size = snprintf(page, PAGE_SIZE - 1, "%u\n", ptp->n_vclocks);
- mutex_unlock(&ptp->n_vclocks_mux);
- return size;
- }
- static ssize_t n_vclocks_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
- {
- struct ptp_clock *ptp = dev_get_drvdata(dev);
- struct ptp_vclock *vclock;
- int err = -EINVAL;
- u32 num, i;
- if (kstrtou32(buf, 0, &num))
- return err;
- if (mutex_lock_interruptible(&ptp->n_vclocks_mux))
- return -ERESTARTSYS;
- if (num > ptp->max_vclocks) {
- dev_err(dev, "max value is %d\n", ptp->max_vclocks);
- goto out;
- }
- /* Need to create more vclocks */
- if (num > ptp->n_vclocks) {
- for (i = 0; i < num - ptp->n_vclocks; i++) {
- vclock = ptp_vclock_register(ptp);
- if (!vclock)
- goto out;
- *(ptp->vclock_index + ptp->n_vclocks + i) =
- vclock->clock->index;
- dev_info(dev, "new virtual clock ptp%d\n",
- vclock->clock->index);
- }
- }
- /* Need to delete vclocks */
- if (num < ptp->n_vclocks) {
- i = ptp->n_vclocks - num;
- device_for_each_child_reverse(dev, &i,
- unregister_vclock);
- for (i = 1; i <= ptp->n_vclocks - num; i++)
- *(ptp->vclock_index + ptp->n_vclocks - i) = -1;
- }
- /* Need to inform about changed physical clock behavior */
- if (!ptp->has_cycles) {
- if (num == 0)
- dev_info(dev, "only physical clock in use now\n");
- else
- dev_info(dev, "guarantee physical clock free running\n");
- }
- ptp->n_vclocks = num;
- mutex_unlock(&ptp->n_vclocks_mux);
- return count;
- out:
- mutex_unlock(&ptp->n_vclocks_mux);
- return err;
- }
- static DEVICE_ATTR_RW(n_vclocks);
- static ssize_t max_vclocks_show(struct device *dev,
- struct device_attribute *attr, char *page)
- {
- struct ptp_clock *ptp = dev_get_drvdata(dev);
- ssize_t size;
- size = snprintf(page, PAGE_SIZE - 1, "%u\n", ptp->max_vclocks);
- return size;
- }
- static ssize_t max_vclocks_store(struct device *dev,
- struct device_attribute *attr,
- const char *buf, size_t count)
- {
- struct ptp_clock *ptp = dev_get_drvdata(dev);
- unsigned int *vclock_index;
- int err = -EINVAL;
- size_t size;
- u32 max;
- if (kstrtou32(buf, 0, &max) || max == 0)
- return -EINVAL;
- if (max == ptp->max_vclocks)
- return count;
- if (mutex_lock_interruptible(&ptp->n_vclocks_mux))
- return -ERESTARTSYS;
- if (max < ptp->n_vclocks)
- goto out;
- size = sizeof(int) * max;
- vclock_index = kzalloc(size, GFP_KERNEL);
- if (!vclock_index) {
- err = -ENOMEM;
- goto out;
- }
- size = sizeof(int) * ptp->n_vclocks;
- memcpy(vclock_index, ptp->vclock_index, size);
- kfree(ptp->vclock_index);
- ptp->vclock_index = vclock_index;
- ptp->max_vclocks = max;
- mutex_unlock(&ptp->n_vclocks_mux);
- return count;
- out:
- mutex_unlock(&ptp->n_vclocks_mux);
- return err;
- }
- static DEVICE_ATTR_RW(max_vclocks);
- static struct attribute *ptp_attrs[] = {
- &dev_attr_clock_name.attr,
- &dev_attr_max_adjustment.attr,
- &dev_attr_n_alarms.attr,
- &dev_attr_n_external_timestamps.attr,
- &dev_attr_n_periodic_outputs.attr,
- &dev_attr_n_programmable_pins.attr,
- &dev_attr_pps_available.attr,
- &dev_attr_extts_enable.attr,
- &dev_attr_fifo.attr,
- &dev_attr_period.attr,
- &dev_attr_pps_enable.attr,
- &dev_attr_n_vclocks.attr,
- &dev_attr_max_vclocks.attr,
- NULL
- };
- static umode_t ptp_is_attribute_visible(struct kobject *kobj,
- struct attribute *attr, int n)
- {
- struct device *dev = kobj_to_dev(kobj);
- struct ptp_clock *ptp = dev_get_drvdata(dev);
- struct ptp_clock_info *info = ptp->info;
- umode_t mode = attr->mode;
- if (attr == &dev_attr_extts_enable.attr ||
- attr == &dev_attr_fifo.attr) {
- if (!info->n_ext_ts)
- mode = 0;
- } else if (attr == &dev_attr_period.attr) {
- if (!info->n_per_out)
- mode = 0;
- } else if (attr == &dev_attr_pps_enable.attr) {
- if (!info->pps)
- mode = 0;
- } else if (attr == &dev_attr_n_vclocks.attr ||
- attr == &dev_attr_max_vclocks.attr) {
- if (ptp->is_virtual_clock)
- mode = 0;
- }
- return mode;
- }
- static const struct attribute_group ptp_group = {
- .is_visible = ptp_is_attribute_visible,
- .attrs = ptp_attrs,
- };
- const struct attribute_group *ptp_groups[] = {
- &ptp_group,
- NULL
- };
- static int ptp_pin_name2index(struct ptp_clock *ptp, const char *name)
- {
- int i;
- for (i = 0; i < ptp->info->n_pins; i++) {
- if (!strcmp(ptp->info->pin_config[i].name, name))
- return i;
- }
- return -1;
- }
- static ssize_t ptp_pin_show(struct device *dev, struct device_attribute *attr,
- char *page)
- {
- struct ptp_clock *ptp = dev_get_drvdata(dev);
- unsigned int func, chan;
- int index;
- index = ptp_pin_name2index(ptp, attr->attr.name);
- if (index < 0)
- return -EINVAL;
- if (mutex_lock_interruptible(&ptp->pincfg_mux))
- return -ERESTARTSYS;
- func = ptp->info->pin_config[index].func;
- chan = ptp->info->pin_config[index].chan;
- mutex_unlock(&ptp->pincfg_mux);
- return sysfs_emit(page, "%u %u\n", func, chan);
- }
- static ssize_t ptp_pin_store(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t count)
- {
- struct ptp_clock *ptp = dev_get_drvdata(dev);
- unsigned int func, chan;
- int cnt, err, index;
- cnt = sscanf(buf, "%u %u", &func, &chan);
- if (cnt != 2)
- return -EINVAL;
- index = ptp_pin_name2index(ptp, attr->attr.name);
- if (index < 0)
- return -EINVAL;
- if (mutex_lock_interruptible(&ptp->pincfg_mux))
- return -ERESTARTSYS;
- err = ptp_set_pinfunc(ptp, index, func, chan);
- mutex_unlock(&ptp->pincfg_mux);
- if (err)
- return err;
- return count;
- }
- int ptp_populate_pin_groups(struct ptp_clock *ptp)
- {
- struct ptp_clock_info *info = ptp->info;
- int err = -ENOMEM, i, n_pins = info->n_pins;
- if (!n_pins)
- return 0;
- ptp->pin_dev_attr = kcalloc(n_pins, sizeof(*ptp->pin_dev_attr),
- GFP_KERNEL);
- if (!ptp->pin_dev_attr)
- goto no_dev_attr;
- ptp->pin_attr = kcalloc(1 + n_pins, sizeof(*ptp->pin_attr), GFP_KERNEL);
- if (!ptp->pin_attr)
- goto no_pin_attr;
- for (i = 0; i < n_pins; i++) {
- struct device_attribute *da = &ptp->pin_dev_attr[i];
- sysfs_attr_init(&da->attr);
- da->attr.name = info->pin_config[i].name;
- da->attr.mode = 0644;
- da->show = ptp_pin_show;
- da->store = ptp_pin_store;
- ptp->pin_attr[i] = &da->attr;
- }
- ptp->pin_attr_group.name = "pins";
- ptp->pin_attr_group.attrs = ptp->pin_attr;
- ptp->pin_attr_groups[0] = &ptp->pin_attr_group;
- return 0;
- no_pin_attr:
- kfree(ptp->pin_dev_attr);
- no_dev_attr:
- return err;
- }
- void ptp_cleanup_pin_groups(struct ptp_clock *ptp)
- {
- kfree(ptp->pin_attr);
- kfree(ptp->pin_dev_attr);
- }
|