1 // SPDX-License-Identifier: GPL-2.0+
10 #include <linux/posix-clock.h>
15 #include "posix-timers.h"
18  * Returns NULL if the posix_clock instance attached to 'fp' is old and stale.
22 	struct posix_clock_context *pccontext = fp->private_data;  in get_posix_clock()
23 	struct posix_clock *clk = pccontext->clk;  in get_posix_clock()
25 	down_read(&clk->rwsem);  in get_posix_clock()
27 	if (!clk->zombie)  in get_posix_clock()
30 	up_read(&clk->rwsem);  in get_posix_clock()
37 	up_read(&clk->rwsem);  in put_posix_clock()
43 	struct posix_clock_context *pccontext = fp->private_data;  in posix_clock_read()
45 	int err = -EINVAL;  in posix_clock_read()
48 		return -ENODEV;  in posix_clock_read()
50 	if (clk->ops.read)  in posix_clock_read()
51 		err = clk->ops.read(pccontext, fp->f_flags, buf, count);  in posix_clock_read()
60 	struct posix_clock_context *pccontext = fp->private_data;  in posix_clock_poll()
67 	if (clk->ops.poll)  in posix_clock_poll()
68 		result = clk->ops.poll(pccontext, fp, wait);  in posix_clock_poll()
78 	struct posix_clock_context *pccontext = fp->private_data;  in posix_clock_ioctl()
80 	int err = -ENOTTY;  in posix_clock_ioctl()
83 		return -ENODEV;  in posix_clock_ioctl()
85 	if (clk->ops.ioctl)  in posix_clock_ioctl()
86 		err = clk->ops.ioctl(pccontext, cmd, arg);  in posix_clock_ioctl()
97 	struct posix_clock_context *pccontext = fp->private_data;  in posix_clock_compat_ioctl()
99 	int err = -ENOTTY;  in posix_clock_compat_ioctl()
102 		return -ENODEV;  in posix_clock_compat_ioctl()
104 	if (clk->ops.ioctl)  in posix_clock_compat_ioctl()
105 		err = clk->ops.ioctl(pccontext, cmd, arg);  in posix_clock_compat_ioctl()
117 		container_of(inode->i_cdev, struct posix_clock, cdev);  in posix_clock_open()
120 	down_read(&clk->rwsem);  in posix_clock_open()
122 	if (clk->zombie) {  in posix_clock_open()
123 		err = -ENODEV;  in posix_clock_open()
128 		err = -ENOMEM;  in posix_clock_open()
131 	pccontext->clk = clk;  in posix_clock_open()
132 	if (clk->ops.open) {  in posix_clock_open()
133 		err = clk->ops.open(pccontext, fp->f_mode);  in posix_clock_open()
140 	fp->private_data = pccontext;  in posix_clock_open()
141 	get_device(clk->dev);  in posix_clock_open()
144 	up_read(&clk->rwsem);  in posix_clock_open()
150 	struct posix_clock_context *pccontext = fp->private_data;  in posix_clock_release()
155 		return -ENODEV;  in posix_clock_release()
156 	clk = pccontext->clk;  in posix_clock_release()
158 	if (clk->ops.release)  in posix_clock_release()
159 		err = clk->ops.release(pccontext);  in posix_clock_release()
161 	put_device(clk->dev);  in posix_clock_release()
164 	fp->private_data = NULL;  in posix_clock_release()
185 	init_rwsem(&clk->rwsem);  in posix_clock_register()
187 	cdev_init(&clk->cdev, &posix_clock_file_operations);  in posix_clock_register()
188 	err = cdev_device_add(&clk->cdev, dev);  in posix_clock_register()
191 			dev_name(dev), MAJOR(dev->devt), MINOR(dev->devt));  in posix_clock_register()
194 	clk->cdev.owner = clk->ops.owner;  in posix_clock_register()
195 	clk->dev = dev;  in posix_clock_register()
203 	cdev_device_del(&clk->cdev, clk->dev);  in posix_clock_unregister()
205 	down_write(&clk->rwsem);  in posix_clock_unregister()
206 	clk->zombie = true;  in posix_clock_unregister()
207 	up_write(&clk->rwsem);  in posix_clock_unregister()
209 	put_device(clk->dev);  in posix_clock_unregister()
221 	int err = -EINVAL;  in get_clock_desc()
226 	if (fp->f_op->open != posix_clock_open || !fp->private_data)  in get_clock_desc()
229 	cd->fp = fp;  in get_clock_desc()
230 	cd->clk = get_posix_clock(fp);  in get_clock_desc()
232 	err = cd->clk ? 0 : -ENODEV;  in get_clock_desc()
241 	put_posix_clock(cd->clk);  in put_clock_desc()
242 	fput(cd->fp);  in put_clock_desc()
254 	if ((cd.fp->f_mode & FMODE_WRITE) == 0) {  in pc_clock_adjtime()
255 		err = -EACCES;  in pc_clock_adjtime()
259 	if (cd.clk->ops.clock_adjtime)  in pc_clock_adjtime()
260 		err = cd.clk->ops.clock_adjtime(cd.clk, tx);  in pc_clock_adjtime()
262 		err = -EOPNOTSUPP;  in pc_clock_adjtime()
269 static int pc_clock_gettime(clockid_t id, struct timespec64 *ts)  in pc_clock_gettime()  argument
278 	if (cd.clk->ops.clock_gettime)  in pc_clock_gettime()
279 		err = cd.clk->ops.clock_gettime(cd.clk, ts);  in pc_clock_gettime()
281 		err = -EOPNOTSUPP;  in pc_clock_gettime()
288 static int pc_clock_getres(clockid_t id, struct timespec64 *ts)  in pc_clock_getres()  argument
297 	if (cd.clk->ops.clock_getres)  in pc_clock_getres()
298 		err = cd.clk->ops.clock_getres(cd.clk, ts);  in pc_clock_getres()
300 		err = -EOPNOTSUPP;  in pc_clock_getres()
307 static int pc_clock_settime(clockid_t id, const struct timespec64 *ts)  in pc_clock_settime()  argument
312 	if (!timespec64_valid_strict(ts))  in pc_clock_settime()
313 		return -EINVAL;  in pc_clock_settime()
319 	if ((cd.fp->f_mode & FMODE_WRITE) == 0) {  in pc_clock_settime()
320 		err = -EACCES;  in pc_clock_settime()
324 	if (cd.clk->ops.clock_settime)  in pc_clock_settime()
325 		err = cd.clk->ops.clock_settime(cd.clk, ts);  in pc_clock_settime()
327 		err = -EOPNOTSUPP;  in pc_clock_settime()