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20#include <linux/module.h>
21#include <linux/posix-clock.h>
22#include <linux/poll.h>
23#include <linux/sched.h>
24#include <linux/slab.h>
25
26#include "ptp_private.h"
27
28int ptp_open(struct posix_clock *pc, fmode_t fmode)
29{
30 return 0;
31}
32
33long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
34{
35 struct ptp_clock_caps caps;
36 struct ptp_clock_request req;
37 struct ptp_sys_offset *sysoff = NULL;
38 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
39 struct ptp_clock_info *ops = ptp->info;
40 struct ptp_clock_time *pct;
41 struct timespec ts;
42 int enable, err = 0;
43 unsigned int i;
44
45 switch (cmd) {
46
47 case PTP_CLOCK_GETCAPS:
48 memset(&caps, 0, sizeof(caps));
49 caps.max_adj = ptp->info->max_adj;
50 caps.n_alarm = ptp->info->n_alarm;
51 caps.n_ext_ts = ptp->info->n_ext_ts;
52 caps.n_per_out = ptp->info->n_per_out;
53 caps.pps = ptp->info->pps;
54 if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
55 err = -EFAULT;
56 break;
57
58 case PTP_EXTTS_REQUEST:
59 if (copy_from_user(&req.extts, (void __user *)arg,
60 sizeof(req.extts))) {
61 err = -EFAULT;
62 break;
63 }
64 if (req.extts.index >= ops->n_ext_ts) {
65 err = -EINVAL;
66 break;
67 }
68 req.type = PTP_CLK_REQ_EXTTS;
69 enable = req.extts.flags & PTP_ENABLE_FEATURE ? 1 : 0;
70 err = ops->enable(ops, &req, enable);
71 break;
72
73 case PTP_PEROUT_REQUEST:
74 if (copy_from_user(&req.perout, (void __user *)arg,
75 sizeof(req.perout))) {
76 err = -EFAULT;
77 break;
78 }
79 if (req.perout.index >= ops->n_per_out) {
80 err = -EINVAL;
81 break;
82 }
83 req.type = PTP_CLK_REQ_PEROUT;
84 enable = req.perout.period.sec || req.perout.period.nsec;
85 err = ops->enable(ops, &req, enable);
86 break;
87
88 case PTP_ENABLE_PPS:
89 if (!capable(CAP_SYS_TIME))
90 return -EPERM;
91 req.type = PTP_CLK_REQ_PPS;
92 enable = arg ? 1 : 0;
93 err = ops->enable(ops, &req, enable);
94 break;
95
96 case PTP_SYS_OFFSET:
97 sysoff = kmalloc(sizeof(*sysoff), GFP_KERNEL);
98 if (!sysoff) {
99 err = -ENOMEM;
100 break;
101 }
102 if (copy_from_user(sysoff, (void __user *)arg,
103 sizeof(*sysoff))) {
104 err = -EFAULT;
105 break;
106 }
107 if (sysoff->n_samples > PTP_MAX_SAMPLES) {
108 err = -EINVAL;
109 break;
110 }
111 pct = &sysoff->ts[0];
112 for (i = 0; i < sysoff->n_samples; i++) {
113 getnstimeofday(&ts);
114 pct->sec = ts.tv_sec;
115 pct->nsec = ts.tv_nsec;
116 pct++;
117 ptp->info->gettime(ptp->info, &ts);
118 pct->sec = ts.tv_sec;
119 pct->nsec = ts.tv_nsec;
120 pct++;
121 }
122 getnstimeofday(&ts);
123 pct->sec = ts.tv_sec;
124 pct->nsec = ts.tv_nsec;
125 if (copy_to_user((void __user *)arg, sysoff, sizeof(*sysoff)))
126 err = -EFAULT;
127 break;
128
129 default:
130 err = -ENOTTY;
131 break;
132 }
133
134 kfree(sysoff);
135 return err;
136}
137
138unsigned int ptp_poll(struct posix_clock *pc, struct file *fp, poll_table *wait)
139{
140 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
141
142 poll_wait(fp, &ptp->tsev_wq, wait);
143
144 return queue_cnt(&ptp->tsevq) ? POLLIN : 0;
145}
146
147#define EXTTS_BUFSIZE (PTP_BUF_TIMESTAMPS * sizeof(struct ptp_extts_event))
148
149ssize_t ptp_read(struct posix_clock *pc,
150 uint rdflags, char __user *buf, size_t cnt)
151{
152 struct ptp_clock *ptp = container_of(pc, struct ptp_clock, clock);
153 struct timestamp_event_queue *queue = &ptp->tsevq;
154 struct ptp_extts_event *event;
155 unsigned long flags;
156 size_t qcnt, i;
157 int result;
158
159 if (cnt % sizeof(struct ptp_extts_event) != 0)
160 return -EINVAL;
161
162 if (cnt > EXTTS_BUFSIZE)
163 cnt = EXTTS_BUFSIZE;
164
165 cnt = cnt / sizeof(struct ptp_extts_event);
166
167 if (mutex_lock_interruptible(&ptp->tsevq_mux))
168 return -ERESTARTSYS;
169
170 if (wait_event_interruptible(ptp->tsev_wq,
171 ptp->defunct || queue_cnt(queue))) {
172 mutex_unlock(&ptp->tsevq_mux);
173 return -ERESTARTSYS;
174 }
175
176 if (ptp->defunct) {
177 mutex_unlock(&ptp->tsevq_mux);
178 return -ENODEV;
179 }
180
181 event = kmalloc(EXTTS_BUFSIZE, GFP_KERNEL);
182 if (!event) {
183 mutex_unlock(&ptp->tsevq_mux);
184 return -ENOMEM;
185 }
186
187 spin_lock_irqsave(&queue->lock, flags);
188
189 qcnt = queue_cnt(queue);
190
191 if (cnt > qcnt)
192 cnt = qcnt;
193
194 for (i = 0; i < cnt; i++) {
195 event[i] = queue->buf[queue->head];
196 queue->head = (queue->head + 1) % PTP_MAX_TIMESTAMPS;
197 }
198
199 spin_unlock_irqrestore(&queue->lock, flags);
200
201 cnt = cnt * sizeof(struct ptp_extts_event);
202
203 mutex_unlock(&ptp->tsevq_mux);
204
205 result = cnt;
206 if (copy_to_user(buf, event, cnt))
207 result = -EFAULT;
208
209 kfree(event);
210 return result;
211}
212
