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d94ba80e RC |
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 | ||
22 | #include "ptp_private.h" | |
23 | ||
24 | static ssize_t clock_name_show(struct device *dev, | |
25 | struct device_attribute *attr, char *page) | |
26 | { | |
27 | struct ptp_clock *ptp = dev_get_drvdata(dev); | |
28 | return snprintf(page, PAGE_SIZE-1, "%s\n", ptp->info->name); | |
29 | } | |
3499116b | 30 | static DEVICE_ATTR(clock_name, 0444, clock_name_show, NULL); |
d94ba80e | 31 | |
3499116b GKH |
32 | #define PTP_SHOW_INT(name, var) \ |
33 | static ssize_t var##_show(struct device *dev, \ | |
d94ba80e RC |
34 | struct device_attribute *attr, char *page) \ |
35 | { \ | |
36 | struct ptp_clock *ptp = dev_get_drvdata(dev); \ | |
3499116b GKH |
37 | return snprintf(page, PAGE_SIZE-1, "%d\n", ptp->info->var); \ |
38 | } \ | |
39 | static DEVICE_ATTR(name, 0444, var##_show, NULL); | |
d94ba80e | 40 | |
3499116b GKH |
41 | PTP_SHOW_INT(max_adjustment, max_adj); |
42 | PTP_SHOW_INT(n_alarms, n_alarm); | |
43 | PTP_SHOW_INT(n_external_timestamps, n_ext_ts); | |
44 | PTP_SHOW_INT(n_periodic_outputs, n_per_out); | |
45 | PTP_SHOW_INT(pps_available, pps); | |
d94ba80e | 46 | |
3499116b GKH |
47 | static struct attribute *ptp_attrs[] = { |
48 | &dev_attr_clock_name.attr, | |
49 | &dev_attr_max_adjustment.attr, | |
50 | &dev_attr_n_alarms.attr, | |
51 | &dev_attr_n_external_timestamps.attr, | |
52 | &dev_attr_n_periodic_outputs.attr, | |
53 | &dev_attr_pps_available.attr, | |
54 | NULL, | |
55 | }; | |
d94ba80e | 56 | |
3499116b GKH |
57 | static const struct attribute_group ptp_group = { |
58 | .attrs = ptp_attrs, | |
d94ba80e RC |
59 | }; |
60 | ||
3499116b GKH |
61 | const struct attribute_group *ptp_groups[] = { |
62 | &ptp_group, | |
63 | NULL, | |
64 | }; | |
65 | ||
66 | ||
d94ba80e RC |
67 | static ssize_t extts_enable_store(struct device *dev, |
68 | struct device_attribute *attr, | |
69 | const char *buf, size_t count) | |
70 | { | |
71 | struct ptp_clock *ptp = dev_get_drvdata(dev); | |
72 | struct ptp_clock_info *ops = ptp->info; | |
73 | struct ptp_clock_request req = { .type = PTP_CLK_REQ_EXTTS }; | |
74 | int cnt, enable; | |
75 | int err = -EINVAL; | |
76 | ||
77 | cnt = sscanf(buf, "%u %d", &req.extts.index, &enable); | |
78 | if (cnt != 2) | |
79 | goto out; | |
80 | if (req.extts.index >= ops->n_ext_ts) | |
81 | goto out; | |
82 | ||
83 | err = ops->enable(ops, &req, enable ? 1 : 0); | |
84 | if (err) | |
85 | goto out; | |
86 | ||
87 | return count; | |
88 | out: | |
89 | return err; | |
90 | } | |
91 | ||
92 | static ssize_t extts_fifo_show(struct device *dev, | |
93 | struct device_attribute *attr, char *page) | |
94 | { | |
95 | struct ptp_clock *ptp = dev_get_drvdata(dev); | |
96 | struct timestamp_event_queue *queue = &ptp->tsevq; | |
97 | struct ptp_extts_event event; | |
98 | unsigned long flags; | |
99 | size_t qcnt; | |
100 | int cnt = 0; | |
101 | ||
102 | memset(&event, 0, sizeof(event)); | |
103 | ||
104 | if (mutex_lock_interruptible(&ptp->tsevq_mux)) | |
105 | return -ERESTARTSYS; | |
106 | ||
107 | spin_lock_irqsave(&queue->lock, flags); | |
108 | qcnt = queue_cnt(queue); | |
109 | if (qcnt) { | |
110 | event = queue->buf[queue->head]; | |
111 | queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS; | |
112 | } | |
113 | spin_unlock_irqrestore(&queue->lock, flags); | |
114 | ||
115 | if (!qcnt) | |
116 | goto out; | |
117 | ||
118 | cnt = snprintf(page, PAGE_SIZE, "%u %lld %u\n", | |
119 | event.index, event.t.sec, event.t.nsec); | |
120 | out: | |
121 | mutex_unlock(&ptp->tsevq_mux); | |
122 | return cnt; | |
123 | } | |
124 | ||
125 | static ssize_t period_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_PEROUT }; | |
132 | int cnt, enable, err = -EINVAL; | |
133 | ||
134 | cnt = sscanf(buf, "%u %lld %u %lld %u", &req.perout.index, | |
135 | &req.perout.start.sec, &req.perout.start.nsec, | |
136 | &req.perout.period.sec, &req.perout.period.nsec); | |
137 | if (cnt != 5) | |
138 | goto out; | |
139 | if (req.perout.index >= ops->n_per_out) | |
140 | goto out; | |
141 | ||
142 | enable = req.perout.period.sec || req.perout.period.nsec; | |
143 | err = ops->enable(ops, &req, enable); | |
144 | if (err) | |
145 | goto out; | |
146 | ||
147 | return count; | |
148 | out: | |
149 | return err; | |
150 | } | |
151 | ||
152 | static ssize_t pps_enable_store(struct device *dev, | |
153 | struct device_attribute *attr, | |
154 | const char *buf, size_t count) | |
155 | { | |
156 | struct ptp_clock *ptp = dev_get_drvdata(dev); | |
157 | struct ptp_clock_info *ops = ptp->info; | |
158 | struct ptp_clock_request req = { .type = PTP_CLK_REQ_PPS }; | |
159 | int cnt, enable; | |
160 | int err = -EINVAL; | |
161 | ||
162 | if (!capable(CAP_SYS_TIME)) | |
163 | return -EPERM; | |
164 | ||
165 | cnt = sscanf(buf, "%d", &enable); | |
166 | if (cnt != 1) | |
167 | goto out; | |
168 | ||
169 | err = ops->enable(ops, &req, enable ? 1 : 0); | |
170 | if (err) | |
171 | goto out; | |
172 | ||
173 | return count; | |
174 | out: | |
175 | return err; | |
176 | } | |
177 | ||
178 | static DEVICE_ATTR(extts_enable, 0220, NULL, extts_enable_store); | |
179 | static DEVICE_ATTR(fifo, 0444, extts_fifo_show, NULL); | |
180 | static DEVICE_ATTR(period, 0220, NULL, period_store); | |
181 | static DEVICE_ATTR(pps_enable, 0220, NULL, pps_enable_store); | |
182 | ||
183 | int ptp_cleanup_sysfs(struct ptp_clock *ptp) | |
184 | { | |
185 | struct device *dev = ptp->dev; | |
186 | struct ptp_clock_info *info = ptp->info; | |
187 | ||
188 | if (info->n_ext_ts) { | |
189 | device_remove_file(dev, &dev_attr_extts_enable); | |
190 | device_remove_file(dev, &dev_attr_fifo); | |
191 | } | |
192 | if (info->n_per_out) | |
193 | device_remove_file(dev, &dev_attr_period); | |
194 | ||
195 | if (info->pps) | |
196 | device_remove_file(dev, &dev_attr_pps_enable); | |
197 | ||
198 | return 0; | |
199 | } | |
200 | ||
201 | int ptp_populate_sysfs(struct ptp_clock *ptp) | |
202 | { | |
203 | struct device *dev = ptp->dev; | |
204 | struct ptp_clock_info *info = ptp->info; | |
205 | int err; | |
206 | ||
207 | if (info->n_ext_ts) { | |
208 | err = device_create_file(dev, &dev_attr_extts_enable); | |
209 | if (err) | |
210 | goto out1; | |
211 | err = device_create_file(dev, &dev_attr_fifo); | |
212 | if (err) | |
213 | goto out2; | |
214 | } | |
215 | if (info->n_per_out) { | |
216 | err = device_create_file(dev, &dev_attr_period); | |
217 | if (err) | |
218 | goto out3; | |
219 | } | |
220 | if (info->pps) { | |
221 | err = device_create_file(dev, &dev_attr_pps_enable); | |
222 | if (err) | |
223 | goto out4; | |
224 | } | |
225 | return 0; | |
226 | out4: | |
227 | if (info->n_per_out) | |
228 | device_remove_file(dev, &dev_attr_period); | |
229 | out3: | |
230 | if (info->n_ext_ts) | |
231 | device_remove_file(dev, &dev_attr_fifo); | |
232 | out2: | |
233 | if (info->n_ext_ts) | |
234 | device_remove_file(dev, &dev_attr_extts_enable); | |
235 | out1: | |
236 | return err; | |
237 | } |