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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}
353
