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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> | |
653104d1 | 21 | #include <linux/slab.h> |
d94ba80e RC |
22 | |
23 | #include "ptp_private.h" | |
24 | ||
25 | static 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 | } | |
63215705 | 31 | static DEVICE_ATTR_RO(clock_name); |
d94ba80e | 32 | |
3499116b GKH |
33 | #define PTP_SHOW_INT(name, var) \ |
34 | static ssize_t var##_show(struct device *dev, \ | |
d94ba80e RC |
35 | struct device_attribute *attr, char *page) \ |
36 | { \ | |
37 | struct ptp_clock *ptp = dev_get_drvdata(dev); \ | |
3499116b GKH |
38 | return snprintf(page, PAGE_SIZE-1, "%d\n", ptp->info->var); \ |
39 | } \ | |
40 | static DEVICE_ATTR(name, 0444, var##_show, NULL); | |
d94ba80e | 41 | |
3499116b GKH |
42 | PTP_SHOW_INT(max_adjustment, max_adj); |
43 | PTP_SHOW_INT(n_alarms, n_alarm); | |
44 | PTP_SHOW_INT(n_external_timestamps, n_ext_ts); | |
45 | PTP_SHOW_INT(n_periodic_outputs, n_per_out); | |
653104d1 | 46 | PTP_SHOW_INT(n_programmable_pins, n_pins); |
3499116b | 47 | PTP_SHOW_INT(pps_available, pps); |
d94ba80e | 48 | |
d94ba80e RC |
49 | static ssize_t extts_enable_store(struct device *dev, |
50 | struct device_attribute *attr, | |
51 | const char *buf, size_t count) | |
52 | { | |
53 | struct ptp_clock *ptp = dev_get_drvdata(dev); | |
54 | struct ptp_clock_info *ops = ptp->info; | |
55 | struct ptp_clock_request req = { .type = PTP_CLK_REQ_EXTTS }; | |
56 | int cnt, enable; | |
57 | int err = -EINVAL; | |
58 | ||
59 | cnt = sscanf(buf, "%u %d", &req.extts.index, &enable); | |
60 | if (cnt != 2) | |
61 | goto out; | |
62 | if (req.extts.index >= ops->n_ext_ts) | |
63 | goto out; | |
64 | ||
65 | err = ops->enable(ops, &req, enable ? 1 : 0); | |
66 | if (err) | |
67 | goto out; | |
68 | ||
69 | return count; | |
70 | out: | |
71 | return err; | |
72 | } | |
af59e717 | 73 | static DEVICE_ATTR(extts_enable, 0220, NULL, extts_enable_store); |
d94ba80e RC |
74 | |
75 | static ssize_t extts_fifo_show(struct device *dev, | |
76 | struct device_attribute *attr, char *page) | |
77 | { | |
78 | struct ptp_clock *ptp = dev_get_drvdata(dev); | |
79 | struct timestamp_event_queue *queue = &ptp->tsevq; | |
80 | struct ptp_extts_event event; | |
81 | unsigned long flags; | |
82 | size_t qcnt; | |
83 | int cnt = 0; | |
84 | ||
85 | memset(&event, 0, sizeof(event)); | |
86 | ||
87 | if (mutex_lock_interruptible(&ptp->tsevq_mux)) | |
88 | return -ERESTARTSYS; | |
89 | ||
90 | spin_lock_irqsave(&queue->lock, flags); | |
91 | qcnt = queue_cnt(queue); | |
92 | if (qcnt) { | |
93 | event = queue->buf[queue->head]; | |
94 | queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS; | |
95 | } | |
96 | spin_unlock_irqrestore(&queue->lock, flags); | |
97 | ||
98 | if (!qcnt) | |
99 | goto out; | |
100 | ||
101 | cnt = snprintf(page, PAGE_SIZE, "%u %lld %u\n", | |
102 | event.index, event.t.sec, event.t.nsec); | |
103 | out: | |
104 | mutex_unlock(&ptp->tsevq_mux); | |
105 | return cnt; | |
106 | } | |
af59e717 | 107 | static DEVICE_ATTR(fifo, 0444, extts_fifo_show, NULL); |
d94ba80e RC |
108 | |
109 | static ssize_t period_store(struct device *dev, | |
110 | struct device_attribute *attr, | |
111 | const char *buf, size_t count) | |
112 | { | |
113 | struct ptp_clock *ptp = dev_get_drvdata(dev); | |
114 | struct ptp_clock_info *ops = ptp->info; | |
115 | struct ptp_clock_request req = { .type = PTP_CLK_REQ_PEROUT }; | |
116 | int cnt, enable, err = -EINVAL; | |
117 | ||
118 | cnt = sscanf(buf, "%u %lld %u %lld %u", &req.perout.index, | |
119 | &req.perout.start.sec, &req.perout.start.nsec, | |
120 | &req.perout.period.sec, &req.perout.period.nsec); | |
121 | if (cnt != 5) | |
122 | goto out; | |
123 | if (req.perout.index >= ops->n_per_out) | |
124 | goto out; | |
125 | ||
126 | enable = req.perout.period.sec || req.perout.period.nsec; | |
127 | err = ops->enable(ops, &req, enable); | |
128 | if (err) | |
129 | goto out; | |
130 | ||
131 | return count; | |
132 | out: | |
133 | return err; | |
134 | } | |
af59e717 | 135 | static DEVICE_ATTR(period, 0220, NULL, period_store); |
d94ba80e RC |
136 | |
137 | static ssize_t pps_enable_store(struct device *dev, | |
138 | struct device_attribute *attr, | |
139 | const char *buf, size_t count) | |
140 | { | |
141 | struct ptp_clock *ptp = dev_get_drvdata(dev); | |
142 | struct ptp_clock_info *ops = ptp->info; | |
143 | struct ptp_clock_request req = { .type = PTP_CLK_REQ_PPS }; | |
144 | int cnt, enable; | |
145 | int err = -EINVAL; | |
146 | ||
147 | if (!capable(CAP_SYS_TIME)) | |
148 | return -EPERM; | |
149 | ||
150 | cnt = sscanf(buf, "%d", &enable); | |
151 | if (cnt != 1) | |
152 | goto out; | |
153 | ||
154 | err = ops->enable(ops, &req, enable ? 1 : 0); | |
155 | if (err) | |
156 | goto out; | |
157 | ||
158 | return count; | |
159 | out: | |
160 | return err; | |
161 | } | |
af59e717 DT |
162 | static DEVICE_ATTR(pps_enable, 0220, NULL, pps_enable_store); |
163 | ||
164 | static struct attribute *ptp_attrs[] = { | |
165 | &dev_attr_clock_name.attr, | |
166 | ||
167 | &dev_attr_max_adjustment.attr, | |
168 | &dev_attr_n_alarms.attr, | |
169 | &dev_attr_n_external_timestamps.attr, | |
170 | &dev_attr_n_periodic_outputs.attr, | |
171 | &dev_attr_n_programmable_pins.attr, | |
172 | &dev_attr_pps_available.attr, | |
173 | ||
174 | &dev_attr_extts_enable.attr, | |
175 | &dev_attr_fifo.attr, | |
176 | &dev_attr_period.attr, | |
177 | &dev_attr_pps_enable.attr, | |
178 | NULL | |
179 | }; | |
180 | ||
181 | static umode_t ptp_is_attribute_visible(struct kobject *kobj, | |
182 | struct attribute *attr, int n) | |
183 | { | |
184 | struct device *dev = kobj_to_dev(kobj); | |
185 | struct ptp_clock *ptp = dev_get_drvdata(dev); | |
186 | struct ptp_clock_info *info = ptp->info; | |
187 | umode_t mode = attr->mode; | |
188 | ||
189 | if (attr == &dev_attr_extts_enable.attr || | |
190 | attr == &dev_attr_fifo.attr) { | |
191 | if (!info->n_ext_ts) | |
192 | mode = 0; | |
193 | } else if (attr == &dev_attr_period.attr) { | |
194 | if (!info->n_per_out) | |
195 | mode = 0; | |
196 | } else if (attr == &dev_attr_pps_enable.attr) { | |
197 | if (!info->pps) | |
198 | mode = 0; | |
199 | } | |
200 | ||
201 | return mode; | |
202 | } | |
203 | ||
204 | static const struct attribute_group ptp_group = { | |
205 | .is_visible = ptp_is_attribute_visible, | |
206 | .attrs = ptp_attrs, | |
207 | }; | |
208 | ||
209 | const struct attribute_group *ptp_groups[] = { | |
210 | &ptp_group, | |
211 | NULL | |
212 | }; | |
d94ba80e | 213 | |
653104d1 RC |
214 | static int ptp_pin_name2index(struct ptp_clock *ptp, const char *name) |
215 | { | |
216 | int i; | |
217 | for (i = 0; i < ptp->info->n_pins; i++) { | |
218 | if (!strcmp(ptp->info->pin_config[i].name, name)) | |
219 | return i; | |
220 | } | |
221 | return -1; | |
222 | } | |
223 | ||
224 | static ssize_t ptp_pin_show(struct device *dev, struct device_attribute *attr, | |
225 | char *page) | |
226 | { | |
227 | struct ptp_clock *ptp = dev_get_drvdata(dev); | |
228 | unsigned int func, chan; | |
229 | int index; | |
230 | ||
231 | index = ptp_pin_name2index(ptp, attr->attr.name); | |
232 | if (index < 0) | |
233 | return -EINVAL; | |
234 | ||
235 | if (mutex_lock_interruptible(&ptp->pincfg_mux)) | |
236 | return -ERESTARTSYS; | |
237 | ||
238 | func = ptp->info->pin_config[index].func; | |
239 | chan = ptp->info->pin_config[index].chan; | |
240 | ||
241 | mutex_unlock(&ptp->pincfg_mux); | |
242 | ||
243 | return snprintf(page, PAGE_SIZE, "%u %u\n", func, chan); | |
244 | } | |
245 | ||
246 | static ssize_t ptp_pin_store(struct device *dev, struct device_attribute *attr, | |
247 | const char *buf, size_t count) | |
248 | { | |
249 | struct ptp_clock *ptp = dev_get_drvdata(dev); | |
250 | unsigned int func, chan; | |
251 | int cnt, err, index; | |
252 | ||
253 | cnt = sscanf(buf, "%u %u", &func, &chan); | |
254 | if (cnt != 2) | |
255 | return -EINVAL; | |
256 | ||
257 | index = ptp_pin_name2index(ptp, attr->attr.name); | |
258 | if (index < 0) | |
259 | return -EINVAL; | |
260 | ||
261 | if (mutex_lock_interruptible(&ptp->pincfg_mux)) | |
262 | return -ERESTARTSYS; | |
263 | err = ptp_set_pinfunc(ptp, index, func, chan); | |
264 | mutex_unlock(&ptp->pincfg_mux); | |
265 | if (err) | |
266 | return err; | |
267 | ||
268 | return count; | |
269 | } | |
270 | ||
85a66e55 | 271 | int ptp_populate_pin_groups(struct ptp_clock *ptp) |
d94ba80e | 272 | { |
653104d1 RC |
273 | struct ptp_clock_info *info = ptp->info; |
274 | int err = -ENOMEM, i, n_pins = info->n_pins; | |
275 | ||
85a66e55 DT |
276 | if (!n_pins) |
277 | return 0; | |
278 | ||
6f7aa56b | 279 | ptp->pin_dev_attr = kcalloc(n_pins, sizeof(*ptp->pin_dev_attr), |
653104d1 RC |
280 | GFP_KERNEL); |
281 | if (!ptp->pin_dev_attr) | |
282 | goto no_dev_attr; | |
283 | ||
6f7aa56b | 284 | ptp->pin_attr = kcalloc(1 + n_pins, sizeof(*ptp->pin_attr), GFP_KERNEL); |
653104d1 RC |
285 | if (!ptp->pin_attr) |
286 | goto no_pin_attr; | |
287 | ||
288 | for (i = 0; i < n_pins; i++) { | |
289 | struct device_attribute *da = &ptp->pin_dev_attr[i]; | |
290 | sysfs_attr_init(&da->attr); | |
291 | da->attr.name = info->pin_config[i].name; | |
292 | da->attr.mode = 0644; | |
293 | da->show = ptp_pin_show; | |
294 | da->store = ptp_pin_store; | |
295 | ptp->pin_attr[i] = &da->attr; | |
296 | } | |
297 | ||
298 | ptp->pin_attr_group.name = "pins"; | |
299 | ptp->pin_attr_group.attrs = ptp->pin_attr; | |
300 | ||
85a66e55 DT |
301 | ptp->pin_attr_groups[0] = &ptp->pin_attr_group; |
302 | ||
653104d1 RC |
303 | return 0; |
304 | ||
653104d1 RC |
305 | no_pin_attr: |
306 | kfree(ptp->pin_dev_attr); | |
307 | no_dev_attr: | |
308 | return err; | |
309 | } | |
310 | ||
85a66e55 | 311 | void ptp_cleanup_pin_groups(struct ptp_clock *ptp) |
d94ba80e | 312 | { |
85a66e55 DT |
313 | kfree(ptp->pin_attr); |
314 | kfree(ptp->pin_dev_attr); | |
d94ba80e | 315 | } |