s390/char/hmcdrv_dev.c

56 static int hmcdrv_dev_open(struct inode *inode, struct file *fp);
57 static int hmcdrv_dev_release(struct inode *inode, struct file *fp);
58 static loff_t hmcdrv_dev_seek(struct file *fp, loff_t pos, int whence);
59 static ssize_t hmcdrv_dev_read(struct file *fp, char __user *ubuf,
61 static ssize_t hmcdrv_dev_write(struct file *fp, const char __user *ubuf,
114 static int hmcdrv_dev_open(struct inode *inode, struct file *fp)
120 	if (fp->f_flags & O_NONBLOCK)
126 	if ((fp->f_flags & O_ACCMODE) == O_RDONLY)
135 	fp->private_data = NULL; /* no command yet */
140 	pr_debug("open file '/dev/%pD' with return code %d\n", fp, rc);
147 static int hmcdrv_dev_release(struct inode *inode, struct file *fp)
149 	pr_debug("closing file '/dev/%pD'\n", fp);
150 	kfree(fp->private_data);
151 	fp->private_data = NULL;
160 static loff_t hmcdrv_dev_seek(struct file *fp, loff_t pos, int whence)
164 		pos += fp->f_pos; /* new position stored in 'pos' */
175 		if (fp->private_data) {
176 			kfree(fp->private_data);
177 			fp->private_data = NULL;
189 	if (fp->f_pos != pos)
190 		++fp->f_version;
192 	fp->f_pos = pos;
221 static ssize_t hmcdrv_dev_read(struct file *fp, char __user *ubuf,
226 	if (((fp->f_flags & O_ACCMODE) == O_WRONLY) ||
227 	    (fp->private_data == NULL)) { /* no FTP cmd defined ? */
231 	retlen = hmcdrv_dev_transfer((char *) fp->private_data,
235 		 fp, (long long) *pos, retlen, len);
246 static ssize_t hmcdrv_dev_write(struct file *fp, const char __user *ubuf,
252 		 fp, (long long) *pos, len);
254 	if (!fp->private_data) { /* first expect a cmd write */
255 		fp->private_data = kmalloc(len + 1, GFP_KERNEL);
257 		if (!fp->private_data)
260 		if (!copy_from_user(fp->private_data, ubuf, len)) {
261 			((char *)fp->private_data)[len] = '\0';
265 		kfree(fp->private_data);
266 		fp->private_data = NULL;
270 	retlen = hmcdrv_dev_transfer((char *) fp->private_data,
275 	pr_debug("write to file '/dev/%pD' returned %zd\n", fp, retlen);