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// 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, want;
const char __user *ptr = buffer;
size_t bytes;
unsigned long flags;
unsigned char buf[256];
u16 ubuf[256];
size_t in, in2, 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++) {
unsigned char c = buf[in];
int nbytes = 8 - fls(c ^ 0xff);
u32 value;
switch (nbytes) {
case 8: /* 0xff */
case 7: /* 0xfe */
case 1: /* 0x80 */
/* Invalid, drop */
goto drop;
case 0:
/* ASCII, copy */
ubuf[out++] = c;
continue;
default:
/* 2..6-byte UTF-8 */
if (bytes - in < nbytes) {
/* We don't have it all yet, stop here
* and wait for the rest
*/
bytes = in;
want = nbytes;
continue;
}
/* First byte */
value = c & ((1u << (7 - nbytes)) - 1);
/* Other bytes */
for (in2 = 2; in2 <= nbytes; in2++) {
c = buf[in + 1];
if ((c & 0xc0) != 0x80) {
/* Invalid, drop the head */
want = 1;
goto drop;
}
value = (value << 6) | (c & 0x3f);
in++;
}
if (value < 0x10000)
ubuf[out++] = value;
want = 1;
break;
}
drop:
/* empty statement */;
}
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;
}
}
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