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302 lines
7.2 KiB
302 lines
7.2 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* PTP 1588 clock support - sysfs interface. |
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* |
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* Copyright (C) 2010 OMICRON electronics GmbH |
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*/ |
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#include <linux/capability.h> |
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#include <linux/slab.h> |
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#include "ptp_private.h" |
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static ssize_t clock_name_show(struct device *dev, |
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struct device_attribute *attr, char *page) |
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{ |
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struct ptp_clock *ptp = dev_get_drvdata(dev); |
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return snprintf(page, PAGE_SIZE-1, "%s\n", ptp->info->name); |
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} |
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static DEVICE_ATTR_RO(clock_name); |
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#define PTP_SHOW_INT(name, var) \ |
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static ssize_t var##_show(struct device *dev, \ |
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struct device_attribute *attr, char *page) \ |
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{ \ |
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struct ptp_clock *ptp = dev_get_drvdata(dev); \ |
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return snprintf(page, PAGE_SIZE-1, "%d\n", ptp->info->var); \ |
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} \ |
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static DEVICE_ATTR(name, 0444, var##_show, NULL); |
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PTP_SHOW_INT(max_adjustment, max_adj); |
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PTP_SHOW_INT(n_alarms, n_alarm); |
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PTP_SHOW_INT(n_external_timestamps, n_ext_ts); |
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PTP_SHOW_INT(n_periodic_outputs, n_per_out); |
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PTP_SHOW_INT(n_programmable_pins, n_pins); |
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PTP_SHOW_INT(pps_available, pps); |
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static ssize_t extts_enable_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct ptp_clock *ptp = dev_get_drvdata(dev); |
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struct ptp_clock_info *ops = ptp->info; |
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struct ptp_clock_request req = { .type = PTP_CLK_REQ_EXTTS }; |
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int cnt, enable; |
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int err = -EINVAL; |
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cnt = sscanf(buf, "%u %d", &req.extts.index, &enable); |
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if (cnt != 2) |
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goto out; |
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if (req.extts.index >= ops->n_ext_ts) |
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goto out; |
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err = ops->enable(ops, &req, enable ? 1 : 0); |
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if (err) |
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goto out; |
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return count; |
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out: |
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return err; |
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} |
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static DEVICE_ATTR(extts_enable, 0220, NULL, extts_enable_store); |
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static ssize_t extts_fifo_show(struct device *dev, |
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struct device_attribute *attr, char *page) |
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{ |
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struct ptp_clock *ptp = dev_get_drvdata(dev); |
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struct timestamp_event_queue *queue = &ptp->tsevq; |
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struct ptp_extts_event event; |
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unsigned long flags; |
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size_t qcnt; |
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int cnt = 0; |
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memset(&event, 0, sizeof(event)); |
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if (mutex_lock_interruptible(&ptp->tsevq_mux)) |
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return -ERESTARTSYS; |
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spin_lock_irqsave(&queue->lock, flags); |
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qcnt = queue_cnt(queue); |
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if (qcnt) { |
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event = queue->buf[queue->head]; |
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queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS; |
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} |
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spin_unlock_irqrestore(&queue->lock, flags); |
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if (!qcnt) |
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goto out; |
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cnt = snprintf(page, PAGE_SIZE, "%u %lld %u\n", |
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event.index, event.t.sec, event.t.nsec); |
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out: |
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mutex_unlock(&ptp->tsevq_mux); |
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return cnt; |
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} |
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static DEVICE_ATTR(fifo, 0444, extts_fifo_show, NULL); |
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static ssize_t period_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct ptp_clock *ptp = dev_get_drvdata(dev); |
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struct ptp_clock_info *ops = ptp->info; |
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struct ptp_clock_request req = { .type = PTP_CLK_REQ_PEROUT }; |
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int cnt, enable, err = -EINVAL; |
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cnt = sscanf(buf, "%u %lld %u %lld %u", &req.perout.index, |
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&req.perout.start.sec, &req.perout.start.nsec, |
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&req.perout.period.sec, &req.perout.period.nsec); |
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if (cnt != 5) |
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goto out; |
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if (req.perout.index >= ops->n_per_out) |
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goto out; |
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enable = req.perout.period.sec || req.perout.period.nsec; |
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err = ops->enable(ops, &req, enable); |
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if (err) |
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goto out; |
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return count; |
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out: |
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return err; |
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} |
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static DEVICE_ATTR(period, 0220, NULL, period_store); |
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static ssize_t pps_enable_store(struct device *dev, |
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struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct ptp_clock *ptp = dev_get_drvdata(dev); |
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struct ptp_clock_info *ops = ptp->info; |
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struct ptp_clock_request req = { .type = PTP_CLK_REQ_PPS }; |
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int cnt, enable; |
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int err = -EINVAL; |
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if (!capable(CAP_SYS_TIME)) |
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return -EPERM; |
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cnt = sscanf(buf, "%d", &enable); |
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if (cnt != 1) |
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goto out; |
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err = ops->enable(ops, &req, enable ? 1 : 0); |
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if (err) |
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goto out; |
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return count; |
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out: |
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return err; |
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} |
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static DEVICE_ATTR(pps_enable, 0220, NULL, pps_enable_store); |
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static struct attribute *ptp_attrs[] = { |
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&dev_attr_clock_name.attr, |
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&dev_attr_max_adjustment.attr, |
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&dev_attr_n_alarms.attr, |
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&dev_attr_n_external_timestamps.attr, |
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&dev_attr_n_periodic_outputs.attr, |
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&dev_attr_n_programmable_pins.attr, |
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&dev_attr_pps_available.attr, |
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&dev_attr_extts_enable.attr, |
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&dev_attr_fifo.attr, |
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&dev_attr_period.attr, |
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&dev_attr_pps_enable.attr, |
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NULL |
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}; |
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static umode_t ptp_is_attribute_visible(struct kobject *kobj, |
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struct attribute *attr, int n) |
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{ |
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struct device *dev = kobj_to_dev(kobj); |
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struct ptp_clock *ptp = dev_get_drvdata(dev); |
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struct ptp_clock_info *info = ptp->info; |
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umode_t mode = attr->mode; |
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if (attr == &dev_attr_extts_enable.attr || |
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attr == &dev_attr_fifo.attr) { |
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if (!info->n_ext_ts) |
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mode = 0; |
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} else if (attr == &dev_attr_period.attr) { |
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if (!info->n_per_out) |
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mode = 0; |
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} else if (attr == &dev_attr_pps_enable.attr) { |
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if (!info->pps) |
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mode = 0; |
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} |
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return mode; |
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} |
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static const struct attribute_group ptp_group = { |
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.is_visible = ptp_is_attribute_visible, |
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.attrs = ptp_attrs, |
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}; |
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const struct attribute_group *ptp_groups[] = { |
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&ptp_group, |
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NULL |
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}; |
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static int ptp_pin_name2index(struct ptp_clock *ptp, const char *name) |
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{ |
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int i; |
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for (i = 0; i < ptp->info->n_pins; i++) { |
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if (!strcmp(ptp->info->pin_config[i].name, name)) |
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return i; |
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} |
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return -1; |
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} |
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static ssize_t ptp_pin_show(struct device *dev, struct device_attribute *attr, |
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char *page) |
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{ |
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struct ptp_clock *ptp = dev_get_drvdata(dev); |
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unsigned int func, chan; |
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int index; |
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index = ptp_pin_name2index(ptp, attr->attr.name); |
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if (index < 0) |
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return -EINVAL; |
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if (mutex_lock_interruptible(&ptp->pincfg_mux)) |
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return -ERESTARTSYS; |
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func = ptp->info->pin_config[index].func; |
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chan = ptp->info->pin_config[index].chan; |
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mutex_unlock(&ptp->pincfg_mux); |
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return snprintf(page, PAGE_SIZE, "%u %u\n", func, chan); |
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} |
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static ssize_t ptp_pin_store(struct device *dev, struct device_attribute *attr, |
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const char *buf, size_t count) |
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{ |
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struct ptp_clock *ptp = dev_get_drvdata(dev); |
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unsigned int func, chan; |
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int cnt, err, index; |
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cnt = sscanf(buf, "%u %u", &func, &chan); |
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if (cnt != 2) |
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return -EINVAL; |
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index = ptp_pin_name2index(ptp, attr->attr.name); |
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if (index < 0) |
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return -EINVAL; |
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if (mutex_lock_interruptible(&ptp->pincfg_mux)) |
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return -ERESTARTSYS; |
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err = ptp_set_pinfunc(ptp, index, func, chan); |
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mutex_unlock(&ptp->pincfg_mux); |
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if (err) |
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return err; |
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return count; |
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} |
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int ptp_populate_pin_groups(struct ptp_clock *ptp) |
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{ |
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struct ptp_clock_info *info = ptp->info; |
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int err = -ENOMEM, i, n_pins = info->n_pins; |
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if (!n_pins) |
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return 0; |
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ptp->pin_dev_attr = kcalloc(n_pins, sizeof(*ptp->pin_dev_attr), |
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GFP_KERNEL); |
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if (!ptp->pin_dev_attr) |
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goto no_dev_attr; |
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ptp->pin_attr = kcalloc(1 + n_pins, sizeof(*ptp->pin_attr), GFP_KERNEL); |
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if (!ptp->pin_attr) |
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goto no_pin_attr; |
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for (i = 0; i < n_pins; i++) { |
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struct device_attribute *da = &ptp->pin_dev_attr[i]; |
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sysfs_attr_init(&da->attr); |
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da->attr.name = info->pin_config[i].name; |
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da->attr.mode = 0644; |
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da->show = ptp_pin_show; |
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da->store = ptp_pin_store; |
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ptp->pin_attr[i] = &da->attr; |
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} |
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ptp->pin_attr_group.name = "pins"; |
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ptp->pin_attr_group.attrs = ptp->pin_attr; |
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ptp->pin_attr_groups[0] = &ptp->pin_attr_group; |
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return 0; |
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no_pin_attr: |
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kfree(ptp->pin_dev_attr); |
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no_dev_attr: |
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return err; |
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} |
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void ptp_cleanup_pin_groups(struct ptp_clock *ptp) |
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{ |
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kfree(ptp->pin_attr); |
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kfree(ptp->pin_dev_attr); |
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}
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