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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 | ||
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 | } | |
30 | ||
31 | #define PTP_SHOW_INT(name) \ | |
32 | static ssize_t name##_show(struct device *dev, \ | |
33 | struct device_attribute *attr, char *page) \ | |
34 | { \ | |
35 | struct ptp_clock *ptp = dev_get_drvdata(dev); \ | |
36 | return snprintf(page, PAGE_SIZE-1, "%d\n", ptp->info->name); \ | |
37 | } | |
38 | ||
39 | PTP_SHOW_INT(max_adj); | |
40 | PTP_SHOW_INT(n_alarm); | |
41 | PTP_SHOW_INT(n_ext_ts); | |
42 | PTP_SHOW_INT(n_per_out); | |
43 | PTP_SHOW_INT(pps); | |
44 | ||
45 | #define PTP_RO_ATTR(_var, _name) { \ | |
46 | .attr = { .name = __stringify(_name), .mode = 0444 }, \ | |
47 | .show = _var##_show, \ | |
48 | } | |
49 | ||
50 | struct device_attribute ptp_dev_attrs[] = { | |
51 | PTP_RO_ATTR(clock_name, clock_name), | |
52 | PTP_RO_ATTR(max_adj, max_adjustment), | |
53 | PTP_RO_ATTR(n_alarm, n_alarms), | |
54 | PTP_RO_ATTR(n_ext_ts, n_external_timestamps), | |
55 | PTP_RO_ATTR(n_per_out, n_periodic_outputs), | |
56 | PTP_RO_ATTR(pps, pps_available), | |
57 | __ATTR_NULL, | |
58 | }; | |
59 | ||
60 | static ssize_t extts_enable_store(struct device *dev, | |
61 | struct device_attribute *attr, | |
62 | const char *buf, size_t count) | |
63 | { | |
64 | struct ptp_clock *ptp = dev_get_drvdata(dev); | |
65 | struct ptp_clock_info *ops = ptp->info; | |
66 | struct ptp_clock_request req = { .type = PTP_CLK_REQ_EXTTS }; | |
67 | int cnt, enable; | |
68 | int err = -EINVAL; | |
69 | ||
70 | cnt = sscanf(buf, "%u %d", &req.extts.index, &enable); | |
71 | if (cnt != 2) | |
72 | goto out; | |
73 | if (req.extts.index >= ops->n_ext_ts) | |
74 | goto out; | |
75 | ||
76 | err = ops->enable(ops, &req, enable ? 1 : 0); | |
77 | if (err) | |
78 | goto out; | |
79 | ||
80 | return count; | |
81 | out: | |
82 | return err; | |
83 | } | |
84 | ||
85 | static ssize_t extts_fifo_show(struct device *dev, | |
86 | struct device_attribute *attr, char *page) | |
87 | { | |
88 | struct ptp_clock *ptp = dev_get_drvdata(dev); | |
89 | struct timestamp_event_queue *queue = &ptp->tsevq; | |
90 | struct ptp_extts_event event; | |
91 | unsigned long flags; | |
92 | size_t qcnt; | |
93 | int cnt = 0; | |
94 | ||
95 | memset(&event, 0, sizeof(event)); | |
96 | ||
97 | if (mutex_lock_interruptible(&ptp->tsevq_mux)) | |
98 | return -ERESTARTSYS; | |
99 | ||
100 | spin_lock_irqsave(&queue->lock, flags); | |
101 | qcnt = queue_cnt(queue); | |
102 | if (qcnt) { | |
103 | event = queue->buf[queue->head]; | |
104 | queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS; | |
105 | } | |
106 | spin_unlock_irqrestore(&queue->lock, flags); | |
107 | ||
108 | if (!qcnt) | |
109 | goto out; | |
110 | ||
111 | cnt = snprintf(page, PAGE_SIZE, "%u %lld %u\n", | |
112 | event.index, event.t.sec, event.t.nsec); | |
113 | out: | |
114 | mutex_unlock(&ptp->tsevq_mux); | |
115 | return cnt; | |
116 | } | |
117 | ||
118 | static ssize_t period_store(struct device *dev, | |
119 | struct device_attribute *attr, | |
120 | const char *buf, size_t count) | |
121 | { | |
122 | struct ptp_clock *ptp = dev_get_drvdata(dev); | |
123 | struct ptp_clock_info *ops = ptp->info; | |
124 | struct ptp_clock_request req = { .type = PTP_CLK_REQ_PEROUT }; | |
125 | int cnt, enable, err = -EINVAL; | |
126 | ||
127 | cnt = sscanf(buf, "%u %lld %u %lld %u", &req.perout.index, | |
128 | &req.perout.start.sec, &req.perout.start.nsec, | |
129 | &req.perout.period.sec, &req.perout.period.nsec); | |
130 | if (cnt != 5) | |
131 | goto out; | |
132 | if (req.perout.index >= ops->n_per_out) | |
133 | goto out; | |
134 | ||
135 | enable = req.perout.period.sec || req.perout.period.nsec; | |
136 | err = ops->enable(ops, &req, enable); | |
137 | if (err) | |
138 | goto out; | |
139 | ||
140 | return count; | |
141 | out: | |
142 | return err; | |
143 | } | |
144 | ||
145 | static ssize_t pps_enable_store(struct device *dev, | |
146 | struct device_attribute *attr, | |
147 | const char *buf, size_t count) | |
148 | { | |
149 | struct ptp_clock *ptp = dev_get_drvdata(dev); | |
150 | struct ptp_clock_info *ops = ptp->info; | |
151 | struct ptp_clock_request req = { .type = PTP_CLK_REQ_PPS }; | |
152 | int cnt, enable; | |
153 | int err = -EINVAL; | |
154 | ||
155 | if (!capable(CAP_SYS_TIME)) | |
156 | return -EPERM; | |
157 | ||
158 | cnt = sscanf(buf, "%d", &enable); | |
159 | if (cnt != 1) | |
160 | goto out; | |
161 | ||
162 | err = ops->enable(ops, &req, enable ? 1 : 0); | |
163 | if (err) | |
164 | goto out; | |
165 | ||
166 | return count; | |
167 | out: | |
168 | return err; | |
169 | } | |
170 | ||
171 | static DEVICE_ATTR(extts_enable, 0220, NULL, extts_enable_store); | |
172 | static DEVICE_ATTR(fifo, 0444, extts_fifo_show, NULL); | |
173 | static DEVICE_ATTR(period, 0220, NULL, period_store); | |
174 | static DEVICE_ATTR(pps_enable, 0220, NULL, pps_enable_store); | |
175 | ||
176 | int ptp_cleanup_sysfs(struct ptp_clock *ptp) | |
177 | { | |
178 | struct device *dev = ptp->dev; | |
179 | struct ptp_clock_info *info = ptp->info; | |
180 | ||
181 | if (info->n_ext_ts) { | |
182 | device_remove_file(dev, &dev_attr_extts_enable); | |
183 | device_remove_file(dev, &dev_attr_fifo); | |
184 | } | |
185 | if (info->n_per_out) | |
186 | device_remove_file(dev, &dev_attr_period); | |
187 | ||
188 | if (info->pps) | |
189 | device_remove_file(dev, &dev_attr_pps_enable); | |
190 | ||
191 | return 0; | |
192 | } | |
193 | ||
194 | int ptp_populate_sysfs(struct ptp_clock *ptp) | |
195 | { | |
196 | struct device *dev = ptp->dev; | |
197 | struct ptp_clock_info *info = ptp->info; | |
198 | int err; | |
199 | ||
200 | if (info->n_ext_ts) { | |
201 | err = device_create_file(dev, &dev_attr_extts_enable); | |
202 | if (err) | |
203 | goto out1; | |
204 | err = device_create_file(dev, &dev_attr_fifo); | |
205 | if (err) | |
206 | goto out2; | |
207 | } | |
208 | if (info->n_per_out) { | |
209 | err = device_create_file(dev, &dev_attr_period); | |
210 | if (err) | |
211 | goto out3; | |
212 | } | |
213 | if (info->pps) { | |
214 | err = device_create_file(dev, &dev_attr_pps_enable); | |
215 | if (err) | |
216 | goto out4; | |
217 | } | |
218 | return 0; | |
219 | out4: | |
220 | if (info->n_per_out) | |
221 | device_remove_file(dev, &dev_attr_period); | |
222 | out3: | |
223 | if (info->n_ext_ts) | |
224 | device_remove_file(dev, &dev_attr_fifo); | |
225 | out2: | |
226 | if (info->n_ext_ts) | |
227 | device_remove_file(dev, &dev_attr_extts_enable); | |
228 | out1: | |
229 | return err; | |
230 | } |