// SPDX-License-Identifier: GPL-2.0#include <linux/errno.h>#include <linux/miscdevice.h>	/* for misc_register, and MISC_DYNAMIC_MINOR */#include <linux/types.h>#include <linux/uaccess.h> #include "speakup.h"#include "spk_priv.h" static int synth_registered, synthu_registered;static int dev_opened; /* Latin1 version */static ssize_t speakup_file_write(struct file *fp, const char __user *buffer,				  size_t nbytes, loff_t *ppos){	size_t count = nbytes;	const char __user *ptr = buffer;	size_t bytes;	unsigned long flags;	u_char buf[256]; 	if (!synth)		return -ENODEV;	while (count > 0) {		bytes = min(count, sizeof(buf));		if (copy_from_user(buf, ptr, bytes))			return -EFAULT;		count -= bytes;		ptr += bytes;		spin_lock_irqsave(&speakup_info.spinlock, flags);		synth_write(buf, bytes);		spin_unlock_irqrestore(&speakup_info.spinlock, flags);	}	return (ssize_t)nbytes;} /* UTF-8 version */static ssize_t speakup_file_writeu(struct file *fp, const char __user *buffer,				   size_t nbytes, loff_t *ppos){	size_t count = nbytes, consumed, want;	const char __user *ptr = buffer;	size_t bytes;	unsigned long flags;	unsigned char buf[256];	u16 ubuf[256];	size_t in, out; 	if (!synth)		return -ENODEV; 	want = 1;	while (count >= want) {		/* Copy some UTF-8 piece from userland */		bytes = min(count, sizeof(buf));		if (copy_from_user(buf, ptr, bytes))			return -EFAULT; 		/* Convert to u16 */		for (in = 0, out = 0; in < bytes; in += consumed) {			s32 value; 			value = synth_utf8_get(buf + in, bytes - in, &consumed, &want);			if (value == -1) {				/* Invalid or incomplete */ 				if (want > bytes - in)					/* We don't have it all yet, stop here					 * and wait for the rest					 */					bytes = in; 				continue;			} 			if (value < 0x10000)				ubuf[out++] = value;		} 		count -= bytes;		ptr += bytes; 		/* And speak this up */		if (out) {			spin_lock_irqsave(&speakup_info.spinlock, flags);			for (in = 0; in < out; in++)				synth_buffer_add(ubuf[in]);			synth_start();			spin_unlock_irqrestore(&speakup_info.spinlock, flags);		}	} 	return (ssize_t)(nbytes - count);} static ssize_t speakup_file_read(struct file *fp, char __user *buf,				 size_t nbytes, loff_t *ppos){	return 0;} static int speakup_file_open(struct inode *ip, struct file *fp){	if (!synth)		return -ENODEV;	if (xchg(&dev_opened, 1))		return -EBUSY;	return 0;} static int speakup_file_release(struct inode *ip, struct file *fp){	dev_opened = 0;	return 0;} static const struct file_operations synth_fops = {	.read = speakup_file_read,	.write = speakup_file_write,	.open = speakup_file_open,	.release = speakup_file_release,}; static const struct file_operations synthu_fops = {	.read = speakup_file_read,	.write = speakup_file_writeu,	.open = speakup_file_open,	.release = speakup_file_release,}; static struct miscdevice synth_device = {	.minor = MISC_DYNAMIC_MINOR,	.name = "synth",	.fops = &synth_fops,}; static struct miscdevice synthu_device = {	.minor = MISC_DYNAMIC_MINOR,	.name = "synthu",	.fops = &synthu_fops,}; void speakup_register_devsynth(void){	if (!synth_registered) {		if (misc_register(&synth_device)) {			pr_warn("Couldn't initialize miscdevice /dev/synth.\n");		} else {			pr_info("initialized device: /dev/synth, node (MAJOR %d, MINOR %d)\n",				MISC_MAJOR, synth_device.minor);			synth_registered = 1;		}	}	if (!synthu_registered) {		if (misc_register(&synthu_device)) {			pr_warn("Couldn't initialize miscdevice /dev/synthu.\n");		} else {			pr_info("initialized device: /dev/synthu, node (MAJOR %d, MINOR %d)\n",				MISC_MAJOR, synthu_device.minor);			synthu_registered = 1;		}	}} void speakup_unregister_devsynth(void){	if (synth_registered) {		pr_info("speakup: unregistering synth device /dev/synth\n");		misc_deregister(&synth_device);		synth_registered = 0;	}	if (synthu_registered) {		pr_info("speakup: unregistering synth device /dev/synthu\n");		misc_deregister(&synthu_device);		synthu_registered = 0;	}}