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1/*
2 * PTP 1588 clock support - sysfs interface.
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/capability.h>
21#include <linux/slab.h>
22
23#include "ptp_private.h"
24
25static ssize_t clock_name_show(struct device *dev,
26 struct device_attribute *attr, char *page)
27{
28 struct ptp_clock *ptp = dev_get_drvdata(dev);
29 return snprintf(page, PAGE_SIZE-1, "%s\n", ptp->info->name);
30}
31static DEVICE_ATTR(clock_name, 0444, clock_name_show, NULL);
32
33#define PTP_SHOW_INT(name, var) \
34static ssize_t var##_show(struct device *dev, \
35 struct device_attribute *attr, char *page) \
36{ \
37 struct ptp_clock *ptp = dev_get_drvdata(dev); \
38 return snprintf(page, PAGE_SIZE-1, "%d\n", ptp->info->var); \
39} \
40static DEVICE_ATTR(name, 0444, var##_show, NULL);
41
42PTP_SHOW_INT(max_adjustment, max_adj);
43PTP_SHOW_INT(n_alarms, n_alarm);
44PTP_SHOW_INT(n_external_timestamps, n_ext_ts);
45PTP_SHOW_INT(n_periodic_outputs, n_per_out);
46PTP_SHOW_INT(n_programmable_pins, n_pins);
47PTP_SHOW_INT(pps_available, pps);
48
49static struct attribute *ptp_attrs[] = {
50 &dev_attr_clock_name.attr,
51 &dev_attr_max_adjustment.attr,
52 &dev_attr_n_alarms.attr,
53 &dev_attr_n_external_timestamps.attr,
54 &dev_attr_n_periodic_outputs.attr,
55 &dev_attr_n_programmable_pins.attr,
56 &dev_attr_pps_available.attr,
57 NULL,
58};
59
60static const struct attribute_group ptp_group = {
61 .attrs = ptp_attrs,
62};
63
64const struct attribute_group *ptp_groups[] = {
65 &ptp_group,
66 NULL,
67};
68
69
70static ssize_t extts_enable_store(struct device *dev,
71 struct device_attribute *attr,
72 const char *buf, size_t count)
73{
74 struct ptp_clock *ptp = dev_get_drvdata(dev);
75 struct ptp_clock_info *ops = ptp->info;
76 struct ptp_clock_request req = { .type = PTP_CLK_REQ_EXTTS };
77 int cnt, enable;
78 int err = -EINVAL;
79
80 cnt = sscanf(buf, "%u %d", &req.extts.index, &enable);
81 if (cnt != 2)
82 goto out;
83 if (req.extts.index >= ops->n_ext_ts)
84 goto out;
85
86 err = ops->enable(ops, &req, enable ? 1 : 0);
87 if (err)
88 goto out;
89
90 return count;
91out:
92 return err;
93}
94
95static ssize_t extts_fifo_show(struct device *dev,
96 struct device_attribute *attr, char *page)
97{
98 struct ptp_clock *ptp = dev_get_drvdata(dev);
99 struct timestamp_event_queue *queue = &ptp->tsevq;
100 struct ptp_extts_event event;
101 unsigned long flags;
102 size_t qcnt;
103 int cnt = 0;
104
105 memset(&event, 0, sizeof(event));
106
107 if (mutex_lock_interruptible(&ptp->tsevq_mux))
108 return -ERESTARTSYS;
109
110 spin_lock_irqsave(&queue->lock, flags);
111 qcnt = queue_cnt(queue);
112 if (qcnt) {
113 event = queue->buf[queue->head];
114 queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS;
115 }
116 spin_unlock_irqrestore(&queue->lock, flags);
117
118 if (!qcnt)
119 goto out;
120
121 cnt = snprintf(page, PAGE_SIZE, "%u %lld %u\n",
122 event.index, event.t.sec, event.t.nsec);
123out:
124 mutex_unlock(&ptp->tsevq_mux);
125 return cnt;
126}
127
128static ssize_t period_store(struct device *dev,
129 struct device_attribute *attr,
130 const char *buf, size_t count)
131{
132 struct ptp_clock *ptp = dev_get_drvdata(dev);
133 struct ptp_clock_info *ops = ptp->info;
134 struct ptp_clock_request req = { .type = PTP_CLK_REQ_PEROUT };
135 int cnt, enable, err = -EINVAL;
136
137 cnt = sscanf(buf, "%u %lld %u %lld %u", &req.perout.index,
138 &req.perout.start.sec, &req.perout.start.nsec,
139 &req.perout.period.sec, &req.perout.period.nsec);
140 if (cnt != 5)
141 goto out;
142 if (req.perout.index >= ops->n_per_out)
143 goto out;
144
145 enable = req.perout.period.sec || req.perout.period.nsec;
146 err = ops->enable(ops, &req, enable);
147 if (err)
148 goto out;
149
150 return count;
151out:
152 return err;
153}
154
155static ssize_t pps_enable_store(struct device *dev,
156 struct device_attribute *attr,
157 const char *buf, size_t count)
158{
159 struct ptp_clock *ptp = dev_get_drvdata(dev);
160 struct ptp_clock_info *ops = ptp->info;
161 struct ptp_clock_request req = { .type = PTP_CLK_REQ_PPS };
162 int cnt, enable;
163 int err = -EINVAL;
164
165 if (!capable(CAP_SYS_TIME))
166 return -EPERM;
167
168 cnt = sscanf(buf, "%d", &enable);
169 if (cnt != 1)
170 goto out;
171
172 err = ops->enable(ops, &req, enable ? 1 : 0);
173 if (err)
174 goto out;
175
176 return count;
177out:
178 return err;
179}
180
181static int ptp_pin_name2index(struct ptp_clock *ptp, const char *name)
182{
183 int i;
184 for (i = 0; i < ptp->info->n_pins; i++) {
185 if (!strcmp(ptp->info->pin_config[i].name, name))
186 return i;
187 }
188 return -1;
189}
190
191static ssize_t ptp_pin_show(struct device *dev, struct device_attribute *attr,
192 char *page)
193{
194 struct ptp_clock *ptp = dev_get_drvdata(dev);
195 unsigned int func, chan;
196 int index;
197
198 index = ptp_pin_name2index(ptp, attr->attr.name);
199 if (index < 0)
200 return -EINVAL;
201
202 if (mutex_lock_interruptible(&ptp->pincfg_mux))
203 return -ERESTARTSYS;
204
205 func = ptp->info->pin_config[index].func;
206 chan = ptp->info->pin_config[index].chan;
207
208 mutex_unlock(&ptp->pincfg_mux);
209
210 return snprintf(page, PAGE_SIZE, "%u %u\n", func, chan);
211}
212
213static ssize_t ptp_pin_store(struct device *dev, struct device_attribute *attr,
214 const char *buf, size_t count)
215{
216 struct ptp_clock *ptp = dev_get_drvdata(dev);
217 unsigned int func, chan;
218 int cnt, err, index;
219
220 cnt = sscanf(buf, "%u %u", &func, &chan);
221 if (cnt != 2)
222 return -EINVAL;
223
224 index = ptp_pin_name2index(ptp, attr->attr.name);
225 if (index < 0)
226 return -EINVAL;
227
228 if (mutex_lock_interruptible(&ptp->pincfg_mux))
229 return -ERESTARTSYS;
230 err = ptp_set_pinfunc(ptp, index, func, chan);
231 mutex_unlock(&ptp->pincfg_mux);
232 if (err)
233 return err;
234
235 return count;
236}
237
238static DEVICE_ATTR(extts_enable, 0220, NULL, extts_enable_store);
239static DEVICE_ATTR(fifo, 0444, extts_fifo_show, NULL);
240static DEVICE_ATTR(period, 0220, NULL, period_store);
241static DEVICE_ATTR(pps_enable, 0220, NULL, pps_enable_store);
242
243int ptp_cleanup_sysfs(struct ptp_clock *ptp)
244{
245 struct device *dev = ptp->dev;
246 struct ptp_clock_info *info = ptp->info;
247
248 if (info->n_ext_ts) {
249 device_remove_file(dev, &dev_attr_extts_enable);
250 device_remove_file(dev, &dev_attr_fifo);
251 }
252 if (info->n_per_out)
253 device_remove_file(dev, &dev_attr_period);
254
255 if (info->pps)
256 device_remove_file(dev, &dev_attr_pps_enable);
257
258 if (info->n_pins) {
259 sysfs_remove_group(&dev->kobj, &ptp->pin_attr_group);
260 kfree(ptp->pin_attr);
261 kfree(ptp->pin_dev_attr);
262 }
263 return 0;
264}
265
266static int ptp_populate_pins(struct ptp_clock *ptp)
267{
268 struct device *dev = ptp->dev;
269 struct ptp_clock_info *info = ptp->info;
270 int err = -ENOMEM, i, n_pins = info->n_pins;
271
272 ptp->pin_dev_attr = kzalloc(n_pins * sizeof(*ptp->pin_dev_attr),
273 GFP_KERNEL);
274 if (!ptp->pin_dev_attr)
275 goto no_dev_attr;
276
277 ptp->pin_attr = kzalloc((1 + n_pins) * sizeof(struct attribute *),
278 GFP_KERNEL);
279 if (!ptp->pin_attr)
280 goto no_pin_attr;
281
282 for (i = 0; i < n_pins; i++) {
283 struct device_attribute *da = &ptp->pin_dev_attr[i];
284 sysfs_attr_init(&da->attr);
285 da->attr.name = info->pin_config[i].name;
286 da->attr.mode = 0644;
287 da->show = ptp_pin_show;
288 da->store = ptp_pin_store;
289 ptp->pin_attr[i] = &da->attr;
290 }
291
292 ptp->pin_attr_group.name = "pins";
293 ptp->pin_attr_group.attrs = ptp->pin_attr;
294
295 err = sysfs_create_group(&dev->kobj, &ptp->pin_attr_group);
296 if (err)
297 goto no_group;
298 return 0;
299
300no_group:
301 kfree(ptp->pin_attr);
302no_pin_attr:
303 kfree(ptp->pin_dev_attr);
304no_dev_attr:
305 return err;
306}
307
308int ptp_populate_sysfs(struct ptp_clock *ptp)
309{
310 struct device *dev = ptp->dev;
311 struct ptp_clock_info *info = ptp->info;
312 int err;
313
314 if (info->n_ext_ts) {
315 err = device_create_file(dev, &dev_attr_extts_enable);
316 if (err)
317 goto out1;
318 err = device_create_file(dev, &dev_attr_fifo);
319 if (err)
320 goto out2;
321 }
322 if (info->n_per_out) {
323 err = device_create_file(dev, &dev_attr_period);
324 if (err)
325 goto out3;
326 }
327 if (info->pps) {
328 err = device_create_file(dev, &dev_attr_pps_enable);
329 if (err)
330 goto out4;
331 }
332 if (info->n_pins) {
333 err = ptp_populate_pins(ptp);
334 if (err)
335 goto out5;
336 }
337 return 0;
338out5:
339 if (info->pps)
340 device_remove_file(dev, &dev_attr_pps_enable);
341out4:
342 if (info->n_per_out)
343 device_remove_file(dev, &dev_attr_period);
344out3:
345 if (info->n_ext_ts)
346 device_remove_file(dev, &dev_attr_fifo);
347out2:
348 if (info->n_ext_ts)
349 device_remove_file(dev, &dev_attr_extts_enable);
350out1:
351 return err;
352}
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * PTP 1588 clock support - sysfs interface.
4 *
5 * Copyright (C) 2010 OMICRON electronics GmbH
6 * Copyright 2021 NXP
7 */
8#include <linux/capability.h>
9#include <linux/slab.h>
10
11#include "ptp_private.h"
12
13static ssize_t clock_name_show(struct device *dev,
14 struct device_attribute *attr, char *page)
15{
16 struct ptp_clock *ptp = dev_get_drvdata(dev);
17 return sysfs_emit(page, "%s\n", ptp->info->name);
18}
19static DEVICE_ATTR_RO(clock_name);
20
21#define PTP_SHOW_INT(name, var) \
22static ssize_t var##_show(struct device *dev, \
23 struct device_attribute *attr, char *page) \
24{ \
25 struct ptp_clock *ptp = dev_get_drvdata(dev); \
26 return snprintf(page, PAGE_SIZE-1, "%d\n", ptp->info->var); \
27} \
28static DEVICE_ATTR(name, 0444, var##_show, NULL);
29
30PTP_SHOW_INT(max_adjustment, max_adj);
31PTP_SHOW_INT(n_alarms, n_alarm);
32PTP_SHOW_INT(n_external_timestamps, n_ext_ts);
33PTP_SHOW_INT(n_periodic_outputs, n_per_out);
34PTP_SHOW_INT(n_programmable_pins, n_pins);
35PTP_SHOW_INT(pps_available, pps);
36
37static ssize_t extts_enable_store(struct device *dev,
38 struct device_attribute *attr,
39 const char *buf, size_t count)
40{
41 struct ptp_clock *ptp = dev_get_drvdata(dev);
42 struct ptp_clock_info *ops = ptp->info;
43 struct ptp_clock_request req = { .type = PTP_CLK_REQ_EXTTS };
44 int cnt, enable;
45 int err = -EINVAL;
46
47 cnt = sscanf(buf, "%u %d", &req.extts.index, &enable);
48 if (cnt != 2)
49 goto out;
50 if (req.extts.index >= ops->n_ext_ts)
51 goto out;
52
53 err = ops->enable(ops, &req, enable ? 1 : 0);
54 if (err)
55 goto out;
56
57 return count;
58out:
59 return err;
60}
61static DEVICE_ATTR(extts_enable, 0220, NULL, extts_enable_store);
62
63static ssize_t extts_fifo_show(struct device *dev,
64 struct device_attribute *attr, char *page)
65{
66 struct ptp_clock *ptp = dev_get_drvdata(dev);
67 struct timestamp_event_queue *queue = &ptp->tsevq;
68 struct ptp_extts_event event;
69 unsigned long flags;
70 size_t qcnt;
71 int cnt = 0;
72
73 memset(&event, 0, sizeof(event));
74
75 if (mutex_lock_interruptible(&ptp->tsevq_mux))
76 return -ERESTARTSYS;
77
78 spin_lock_irqsave(&queue->lock, flags);
79 qcnt = queue_cnt(queue);
80 if (qcnt) {
81 event = queue->buf[queue->head];
82 queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS;
83 }
84 spin_unlock_irqrestore(&queue->lock, flags);
85
86 if (!qcnt)
87 goto out;
88
89 cnt = snprintf(page, PAGE_SIZE, "%u %lld %u\n",
90 event.index, event.t.sec, event.t.nsec);
91out:
92 mutex_unlock(&ptp->tsevq_mux);
93 return cnt;
94}
95static DEVICE_ATTR(fifo, 0444, extts_fifo_show, NULL);
96
97static ssize_t period_store(struct device *dev,
98 struct device_attribute *attr,
99 const char *buf, size_t count)
100{
101 struct ptp_clock *ptp = dev_get_drvdata(dev);
102 struct ptp_clock_info *ops = ptp->info;
103 struct ptp_clock_request req = { .type = PTP_CLK_REQ_PEROUT };
104 int cnt, enable, err = -EINVAL;
105
106 cnt = sscanf(buf, "%u %lld %u %lld %u", &req.perout.index,
107 &req.perout.start.sec, &req.perout.start.nsec,
108 &req.perout.period.sec, &req.perout.period.nsec);
109 if (cnt != 5)
110 goto out;
111 if (req.perout.index >= ops->n_per_out)
112 goto out;
113
114 enable = req.perout.period.sec || req.perout.period.nsec;
115 err = ops->enable(ops, &req, enable);
116 if (err)
117 goto out;
118
119 return count;
120out:
121 return err;
122}
123static DEVICE_ATTR(period, 0220, NULL, period_store);
124
125static ssize_t pps_enable_store(struct device *dev,
126 struct device_attribute *attr,
127 const char *buf, size_t count)
128{
129 struct ptp_clock *ptp = dev_get_drvdata(dev);
130 struct ptp_clock_info *ops = ptp->info;
131 struct ptp_clock_request req = { .type = PTP_CLK_REQ_PPS };
132 int cnt, enable;
133 int err = -EINVAL;
134
135 if (!capable(CAP_SYS_TIME))
136 return -EPERM;
137
138 cnt = sscanf(buf, "%d", &enable);
139 if (cnt != 1)
140 goto out;
141
142 err = ops->enable(ops, &req, enable ? 1 : 0);
143 if (err)
144 goto out;
145
146 return count;
147out:
148 return err;
149}
150static DEVICE_ATTR(pps_enable, 0220, NULL, pps_enable_store);
151
152static int unregister_vclock(struct device *dev, void *data)
153{
154 struct ptp_clock *ptp = dev_get_drvdata(dev);
155 struct ptp_clock_info *info = ptp->info;
156 struct ptp_vclock *vclock;
157 u32 *num = data;
158
159 vclock = info_to_vclock(info);
160 dev_info(dev->parent, "delete virtual clock ptp%d\n",
161 vclock->clock->index);
162
163 ptp_vclock_unregister(vclock);
164 (*num)--;
165
166 /* For break. Not error. */
167 if (*num == 0)
168 return -EINVAL;
169
170 return 0;
171}
172
173static ssize_t n_vclocks_show(struct device *dev,
174 struct device_attribute *attr, char *page)
175{
176 struct ptp_clock *ptp = dev_get_drvdata(dev);
177 ssize_t size;
178
179 if (mutex_lock_interruptible(&ptp->n_vclocks_mux))
180 return -ERESTARTSYS;
181
182 size = snprintf(page, PAGE_SIZE - 1, "%u\n", ptp->n_vclocks);
183
184 mutex_unlock(&ptp->n_vclocks_mux);
185
186 return size;
187}
188
189static ssize_t n_vclocks_store(struct device *dev,
190 struct device_attribute *attr,
191 const char *buf, size_t count)
192{
193 struct ptp_clock *ptp = dev_get_drvdata(dev);
194 struct ptp_vclock *vclock;
195 int err = -EINVAL;
196 u32 num, i;
197
198 if (kstrtou32(buf, 0, &num))
199 return err;
200
201 if (mutex_lock_interruptible(&ptp->n_vclocks_mux))
202 return -ERESTARTSYS;
203
204 if (num > ptp->max_vclocks) {
205 dev_err(dev, "max value is %d\n", ptp->max_vclocks);
206 goto out;
207 }
208
209 /* Need to create more vclocks */
210 if (num > ptp->n_vclocks) {
211 for (i = 0; i < num - ptp->n_vclocks; i++) {
212 vclock = ptp_vclock_register(ptp);
213 if (!vclock)
214 goto out;
215
216 *(ptp->vclock_index + ptp->n_vclocks + i) =
217 vclock->clock->index;
218
219 dev_info(dev, "new virtual clock ptp%d\n",
220 vclock->clock->index);
221 }
222 }
223
224 /* Need to delete vclocks */
225 if (num < ptp->n_vclocks) {
226 i = ptp->n_vclocks - num;
227 device_for_each_child_reverse(dev, &i,
228 unregister_vclock);
229
230 for (i = 1; i <= ptp->n_vclocks - num; i++)
231 *(ptp->vclock_index + ptp->n_vclocks - i) = -1;
232 }
233
234 /* Need to inform about changed physical clock behavior */
235 if (!ptp->has_cycles) {
236 if (num == 0)
237 dev_info(dev, "only physical clock in use now\n");
238 else
239 dev_info(dev, "guarantee physical clock free running\n");
240 }
241
242 ptp->n_vclocks = num;
243 mutex_unlock(&ptp->n_vclocks_mux);
244
245 return count;
246out:
247 mutex_unlock(&ptp->n_vclocks_mux);
248 return err;
249}
250static DEVICE_ATTR_RW(n_vclocks);
251
252static ssize_t max_vclocks_show(struct device *dev,
253 struct device_attribute *attr, char *page)
254{
255 struct ptp_clock *ptp = dev_get_drvdata(dev);
256 ssize_t size;
257
258 size = snprintf(page, PAGE_SIZE - 1, "%u\n", ptp->max_vclocks);
259
260 return size;
261}
262
263static ssize_t max_vclocks_store(struct device *dev,
264 struct device_attribute *attr,
265 const char *buf, size_t count)
266{
267 struct ptp_clock *ptp = dev_get_drvdata(dev);
268 unsigned int *vclock_index;
269 int err = -EINVAL;
270 size_t size;
271 u32 max;
272
273 if (kstrtou32(buf, 0, &max) || max == 0)
274 return -EINVAL;
275
276 if (max == ptp->max_vclocks)
277 return count;
278
279 if (mutex_lock_interruptible(&ptp->n_vclocks_mux))
280 return -ERESTARTSYS;
281
282 if (max < ptp->n_vclocks)
283 goto out;
284
285 size = sizeof(int) * max;
286 vclock_index = kzalloc(size, GFP_KERNEL);
287 if (!vclock_index) {
288 err = -ENOMEM;
289 goto out;
290 }
291
292 size = sizeof(int) * ptp->n_vclocks;
293 memcpy(vclock_index, ptp->vclock_index, size);
294
295 kfree(ptp->vclock_index);
296 ptp->vclock_index = vclock_index;
297 ptp->max_vclocks = max;
298
299 mutex_unlock(&ptp->n_vclocks_mux);
300
301 return count;
302out:
303 mutex_unlock(&ptp->n_vclocks_mux);
304 return err;
305}
306static DEVICE_ATTR_RW(max_vclocks);
307
308static struct attribute *ptp_attrs[] = {
309 &dev_attr_clock_name.attr,
310
311 &dev_attr_max_adjustment.attr,
312 &dev_attr_n_alarms.attr,
313 &dev_attr_n_external_timestamps.attr,
314 &dev_attr_n_periodic_outputs.attr,
315 &dev_attr_n_programmable_pins.attr,
316 &dev_attr_pps_available.attr,
317
318 &dev_attr_extts_enable.attr,
319 &dev_attr_fifo.attr,
320 &dev_attr_period.attr,
321 &dev_attr_pps_enable.attr,
322 &dev_attr_n_vclocks.attr,
323 &dev_attr_max_vclocks.attr,
324 NULL
325};
326
327static umode_t ptp_is_attribute_visible(struct kobject *kobj,
328 struct attribute *attr, int n)
329{
330 struct device *dev = kobj_to_dev(kobj);
331 struct ptp_clock *ptp = dev_get_drvdata(dev);
332 struct ptp_clock_info *info = ptp->info;
333 umode_t mode = attr->mode;
334
335 if (attr == &dev_attr_extts_enable.attr ||
336 attr == &dev_attr_fifo.attr) {
337 if (!info->n_ext_ts)
338 mode = 0;
339 } else if (attr == &dev_attr_period.attr) {
340 if (!info->n_per_out)
341 mode = 0;
342 } else if (attr == &dev_attr_pps_enable.attr) {
343 if (!info->pps)
344 mode = 0;
345 } else if (attr == &dev_attr_n_vclocks.attr ||
346 attr == &dev_attr_max_vclocks.attr) {
347 if (ptp->is_virtual_clock)
348 mode = 0;
349 }
350
351 return mode;
352}
353
354static const struct attribute_group ptp_group = {
355 .is_visible = ptp_is_attribute_visible,
356 .attrs = ptp_attrs,
357};
358
359const struct attribute_group *ptp_groups[] = {
360 &ptp_group,
361 NULL
362};
363
364static int ptp_pin_name2index(struct ptp_clock *ptp, const char *name)
365{
366 int i;
367 for (i = 0; i < ptp->info->n_pins; i++) {
368 if (!strcmp(ptp->info->pin_config[i].name, name))
369 return i;
370 }
371 return -1;
372}
373
374static ssize_t ptp_pin_show(struct device *dev, struct device_attribute *attr,
375 char *page)
376{
377 struct ptp_clock *ptp = dev_get_drvdata(dev);
378 unsigned int func, chan;
379 int index;
380
381 index = ptp_pin_name2index(ptp, attr->attr.name);
382 if (index < 0)
383 return -EINVAL;
384
385 if (mutex_lock_interruptible(&ptp->pincfg_mux))
386 return -ERESTARTSYS;
387
388 func = ptp->info->pin_config[index].func;
389 chan = ptp->info->pin_config[index].chan;
390
391 mutex_unlock(&ptp->pincfg_mux);
392
393 return sysfs_emit(page, "%u %u\n", func, chan);
394}
395
396static ssize_t ptp_pin_store(struct device *dev, struct device_attribute *attr,
397 const char *buf, size_t count)
398{
399 struct ptp_clock *ptp = dev_get_drvdata(dev);
400 unsigned int func, chan;
401 int cnt, err, index;
402
403 cnt = sscanf(buf, "%u %u", &func, &chan);
404 if (cnt != 2)
405 return -EINVAL;
406
407 index = ptp_pin_name2index(ptp, attr->attr.name);
408 if (index < 0)
409 return -EINVAL;
410
411 if (mutex_lock_interruptible(&ptp->pincfg_mux))
412 return -ERESTARTSYS;
413 err = ptp_set_pinfunc(ptp, index, func, chan);
414 mutex_unlock(&ptp->pincfg_mux);
415 if (err)
416 return err;
417
418 return count;
419}
420
421int ptp_populate_pin_groups(struct ptp_clock *ptp)
422{
423 struct ptp_clock_info *info = ptp->info;
424 int err = -ENOMEM, i, n_pins = info->n_pins;
425
426 if (!n_pins)
427 return 0;
428
429 ptp->pin_dev_attr = kcalloc(n_pins, sizeof(*ptp->pin_dev_attr),
430 GFP_KERNEL);
431 if (!ptp->pin_dev_attr)
432 goto no_dev_attr;
433
434 ptp->pin_attr = kcalloc(1 + n_pins, sizeof(*ptp->pin_attr), GFP_KERNEL);
435 if (!ptp->pin_attr)
436 goto no_pin_attr;
437
438 for (i = 0; i < n_pins; i++) {
439 struct device_attribute *da = &ptp->pin_dev_attr[i];
440 sysfs_attr_init(&da->attr);
441 da->attr.name = info->pin_config[i].name;
442 da->attr.mode = 0644;
443 da->show = ptp_pin_show;
444 da->store = ptp_pin_store;
445 ptp->pin_attr[i] = &da->attr;
446 }
447
448 ptp->pin_attr_group.name = "pins";
449 ptp->pin_attr_group.attrs = ptp->pin_attr;
450
451 ptp->pin_attr_groups[0] = &ptp->pin_attr_group;
452
453 return 0;
454
455no_pin_attr:
456 kfree(ptp->pin_dev_attr);
457no_dev_attr:
458 return err;
459}
460
461void ptp_cleanup_pin_groups(struct ptp_clock *ptp)
462{
463 kfree(ptp->pin_attr);
464 kfree(ptp->pin_dev_attr);
465}