[linux-block.git] / drivers / staging / speakup / speakup_soft.c

// SPDX-License-Identifier: GPL-2.0+
/* speakup_soft.c - speakup driver to register and make available
 * a user space device for software synthesizers.  written by: Kirk
 * Reiser <kirk@braille.uwo.ca>
 *
 * Copyright (C) 2003  Kirk Reiser.
 *
 * this code is specificly written as a driver for the speakup screenreview
 * package and is not a general device driver.
 */

#include <linux/unistd.h>
#include <linux/miscdevice.h>	/* for misc_register, and SYNTH_MINOR */
#include <linux/poll.h>		/* for poll_wait() */

/* schedule(), signal_pending(), TASK_INTERRUPTIBLE */
#include <linux/sched/signal.h>

#include "spk_priv.h"
#include "speakup.h"

#define DRV_VERSION "2.6"
#define SOFTSYNTH_MINOR 26 /* might as well give it one more than /dev/synth */
#define SOFTSYNTHU_MINOR 27 /* might as well give it one more than /dev/synth */
#define PROCSPEECH 0x0d
#define CLEAR_SYNTH 0x18

static int softsynth_probe(struct spk_synth *synth);
static void softsynth_release(void);
static int softsynth_is_alive(struct spk_synth *synth);
static unsigned char get_index(struct spk_synth *synth);

static struct miscdevice synth_device, synthu_device;
static int init_pos;
static int misc_registered;

static struct var_t vars[] = {
	{ CAPS_START, .u.s = {"\x01+3p" } },
	{ CAPS_STOP, .u.s = {"\x01-3p" } },
	{ PAUSE, .u.n = {"\x01P" } },
	{ RATE, .u.n = {"\x01%ds", 2, 0, 9, 0, 0, NULL } },
	{ PITCH, .u.n = {"\x01%dp", 5, 0, 9, 0, 0, NULL } },
	{ VOL, .u.n = {"\x01%dv", 5, 0, 9, 0, 0, NULL } },
	{ TONE, .u.n = {"\x01%dx", 1, 0, 2, 0, 0, NULL } },
	{ PUNCT, .u.n = {"\x01%db", 0, 0, 2, 0, 0, NULL } },
	{ VOICE, .u.n = {"\x01%do", 0, 0, 7, 0, 0, NULL } },
	{ FREQUENCY, .u.n = {"\x01%df", 5, 0, 9, 0, 0, NULL } },
	{ DIRECT, .u.n = {NULL, 0, 0, 1, 0, 0, NULL } },
	V_LAST_VAR
};

/* These attributes will appear in /sys/accessibility/speakup/soft. */

static struct kobj_attribute caps_start_attribute =
	__ATTR(caps_start, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute caps_stop_attribute =
	__ATTR(caps_stop, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute freq_attribute =
	__ATTR(freq, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute pitch_attribute =
	__ATTR(pitch, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute punct_attribute =
	__ATTR(punct, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute rate_attribute =
	__ATTR(rate, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute tone_attribute =
	__ATTR(tone, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute voice_attribute =
	__ATTR(voice, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute vol_attribute =
	__ATTR(vol, 0644, spk_var_show, spk_var_store);

/*
 * We should uncomment the following definition, when we agree on a
 * method of passing a language designation to the software synthesizer.
 * static struct kobj_attribute lang_attribute =
 *	__ATTR(lang, 0644, spk_var_show, spk_var_store);
 */

static struct kobj_attribute delay_time_attribute =
	__ATTR(delay_time, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute direct_attribute =
	__ATTR(direct, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute full_time_attribute =
	__ATTR(full_time, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute jiffy_delta_attribute =
	__ATTR(jiffy_delta, 0644, spk_var_show, spk_var_store);
static struct kobj_attribute trigger_time_attribute =
	__ATTR(trigger_time, 0644, spk_var_show, spk_var_store);

/*
 * Create a group of attributes so that we can create and destroy them all
 * at once.
 */
static struct attribute *synth_attrs[] = {
	&caps_start_attribute.attr,
	&caps_stop_attribute.attr,
	&freq_attribute.attr,
/*	&lang_attribute.attr, */
	&pitch_attribute.attr,
	&punct_attribute.attr,
	&rate_attribute.attr,
	&tone_attribute.attr,
	&voice_attribute.attr,
	&vol_attribute.attr,
	&delay_time_attribute.attr,
	&direct_attribute.attr,
	&full_time_attribute.attr,
	&jiffy_delta_attribute.attr,
	&trigger_time_attribute.attr,
	NULL,	/* need to NULL terminate the list of attributes */
};

static struct spk_synth synth_soft = {
	.name = "soft",
	.version = DRV_VERSION,
	.long_name = "software synth",
	.init = "\01@\x01\x31y\n",
	.procspeech = PROCSPEECH,
	.delay = 0,
	.trigger = 0,
	.jiffies = 0,
	.full = 0,
	.startup = SYNTH_START,
	.checkval = SYNTH_CHECK,
	.vars = vars,
	.io_ops = NULL,
	.probe = softsynth_probe,
	.release = softsynth_release,
	.synth_immediate = NULL,
	.catch_up = NULL,
	.flush = NULL,
	.is_alive = softsynth_is_alive,
	.synth_adjust = NULL,
	.read_buff_add = NULL,
	.get_index = get_index,
	.indexing = {
		.command = "\x01%di",
		.lowindex = 1,
		.highindex = 5,
		.currindex = 1,
	},
	.attributes = {
		.attrs = synth_attrs,
		.name = "soft",
	},
};

static char *get_initstring(void)
{
	static char buf[40];
	char *cp;
	struct var_t *var;

	memset(buf, 0, sizeof(buf));
	cp = buf;
	var = synth_soft.vars;
	while (var->var_id != MAXVARS) {
		if (var->var_id != CAPS_START && var->var_id != CAPS_STOP &&
		    var->var_id != PAUSE && var->var_id != DIRECT)
			cp = cp + sprintf(cp, var->u.n.synth_fmt,
					  var->u.n.value);
		var++;
	}
	cp = cp + sprintf(cp, "\n");
	return buf;
}

static int softsynth_open(struct inode *inode, struct file *fp)
{
	unsigned long flags;
	/*if ((fp->f_flags & O_ACCMODE) != O_RDONLY) */
	/*	return -EPERM; */
	spin_lock_irqsave(&speakup_info.spinlock, flags);
	if (synth_soft.alive) {
		spin_unlock_irqrestore(&speakup_info.spinlock, flags);
		return -EBUSY;
	}
	synth_soft.alive = 1;
	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
	return 0;
}

static int softsynth_close(struct inode *inode, struct file *fp)
{
	unsigned long flags;

	spin_lock_irqsave(&speakup_info.spinlock, flags);
	synth_soft.alive = 0;
	init_pos = 0;
	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
	/* Make sure we let applications go before leaving */
	speakup_start_ttys();
	return 0;
}

static ssize_t softsynthx_read(struct file *fp, char __user *buf, size_t count,
			       loff_t *pos, int unicode)
{
	int chars_sent = 0;
	char __user *cp;
	char *init;
	size_t bytes_per_ch = unicode ? 3 : 1;
	u16 ch;
	int empty;
	unsigned long flags;
	DEFINE_WAIT(wait);

	if (count < bytes_per_ch)
		return -EINVAL;

	spin_lock_irqsave(&speakup_info.spinlock, flags);
	synth_soft.alive = 1;
	while (1) {
		prepare_to_wait(&speakup_event, &wait, TASK_INTERRUPTIBLE);
		if (synth_current() == &synth_soft) {
			if (!unicode)
				synth_buffer_skip_nonlatin1();
			if (!synth_buffer_empty() || speakup_info.flushing)
				break;
		}
		spin_unlock_irqrestore(&speakup_info.spinlock, flags);
		if (fp->f_flags & O_NONBLOCK) {
			finish_wait(&speakup_event, &wait);
			return -EAGAIN;
		}
		if (signal_pending(current)) {
			finish_wait(&speakup_event, &wait);
			return -ERESTARTSYS;
		}
		schedule();
		spin_lock_irqsave(&speakup_info.spinlock, flags);
	}
	finish_wait(&speakup_event, &wait);

	cp = buf;
	init = get_initstring();

	/* Keep 3 bytes available for a 16bit UTF-8-encoded character */
	while (chars_sent <= count - bytes_per_ch) {
		if (synth_current() != &synth_soft)
			break;
		if (speakup_info.flushing) {
			speakup_info.flushing = 0;
			ch = '\x18';
		} else if (init[init_pos]) {
			ch = init[init_pos++];
		} else {
			if (!unicode)
				synth_buffer_skip_nonlatin1();
			if (synth_buffer_empty())
				break;
			ch = synth_buffer_getc();
		}
		spin_unlock_irqrestore(&speakup_info.spinlock, flags);

		if ((!unicode && ch < 0x100) || (unicode && ch < 0x80)) {
			u_char c = ch;

			if (copy_to_user(cp, &c, 1))
				return -EFAULT;

			chars_sent++;
			cp++;
		} else if (unicode && ch < 0x800) {
			u_char s[2] = {
				0xc0 | (ch >> 6),
				0x80 | (ch & 0x3f)
			};

			if (copy_to_user(cp, s, sizeof(s)))
				return -EFAULT;

			chars_sent += sizeof(s);
			cp += sizeof(s);
		} else if (unicode) {
			u_char s[3] = {
				0xe0 | (ch >> 12),
				0x80 | ((ch >> 6) & 0x3f),
				0x80 | (ch & 0x3f)
			};

			if (copy_to_user(cp, s, sizeof(s)))
				return -EFAULT;

			chars_sent += sizeof(s);
			cp += sizeof(s);
		}

		spin_lock_irqsave(&speakup_info.spinlock, flags);
	}
	*pos += chars_sent;
	empty = synth_buffer_empty();
	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
	if (empty) {
		speakup_start_ttys();
		*pos = 0;
	}
	return chars_sent;
}

static ssize_t softsynth_read(struct file *fp, char __user *buf, size_t count,
			      loff_t *pos)
{
	return softsynthx_read(fp, buf, count, pos, 0);
}

static ssize_t softsynthu_read(struct file *fp, char __user *buf, size_t count,
			       loff_t *pos)
{
	return softsynthx_read(fp, buf, count, pos, 1);
}

static int last_index;

static ssize_t softsynth_write(struct file *fp, const char __user *buf,
			       size_t count, loff_t *pos)
{
	unsigned long supplied_index = 0;
	int converted;

	converted = kstrtoul_from_user(buf, count, 0, &supplied_index);

	if (converted < 0)
		return converted;

	last_index = supplied_index;
	return count;
}

static __poll_t softsynth_poll(struct file *fp, struct poll_table_struct *wait)
{
	unsigned long flags;
	__poll_t ret = 0;

	poll_wait(fp, &speakup_event, wait);

	spin_lock_irqsave(&speakup_info.spinlock, flags);
	if (synth_current() == &synth_soft &&
	    (!synth_buffer_empty() || speakup_info.flushing))
		ret = EPOLLIN | EPOLLRDNORM;
	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
	return ret;
}

static unsigned char get_index(struct spk_synth *synth)
{
	int rv;

	rv = last_index;
	last_index = 0;
	return rv;
}

static const struct file_operations softsynth_fops = {
	.owner = THIS_MODULE,
	.poll = softsynth_poll,
	.read = softsynth_read,
	.write = softsynth_write,
	.open = softsynth_open,
	.release = softsynth_close,
};

static const struct file_operations softsynthu_fops = {
	.owner = THIS_MODULE,
	.poll = softsynth_poll,
	.read = softsynthu_read,
	.write = softsynth_write,
	.open = softsynth_open,
	.release = softsynth_close,
};

static int softsynth_probe(struct spk_synth *synth)
{
	if (misc_registered != 0)
		return 0;
	memset(&synth_device, 0, sizeof(synth_device));
	synth_device.minor = SOFTSYNTH_MINOR;
	synth_device.name = "softsynth";
	synth_device.fops = &softsynth_fops;
	if (misc_register(&synth_device)) {
		pr_warn("Couldn't initialize miscdevice /dev/softsynth.\n");
		return -ENODEV;
	}

	memset(&synthu_device, 0, sizeof(synthu_device));
	synthu_device.minor = SOFTSYNTHU_MINOR;
	synthu_device.name = "softsynthu";
	synthu_device.fops = &softsynthu_fops;
	if (misc_register(&synthu_device)) {
		pr_warn("Couldn't initialize miscdevice /dev/softsynthu.\n");
		return -ENODEV;
	}

	misc_registered = 1;
	pr_info("initialized device: /dev/softsynth, node (MAJOR 10, MINOR 26)\n");
	pr_info("initialized device: /dev/softsynthu, node (MAJOR 10, MINOR 27)\n");
	return 0;
}

static void softsynth_release(void)
{
	misc_deregister(&synth_device);
	misc_deregister(&synthu_device);
	misc_registered = 0;
	pr_info("unregistered /dev/softsynth\n");
	pr_info("unregistered /dev/softsynthu\n");
}

static int softsynth_is_alive(struct spk_synth *synth)
{
	if (synth_soft.alive)
		return 1;
	return 0;
}

module_param_named(start, synth_soft.startup, short, 0444);

MODULE_PARM_DESC(start, "Start the synthesizer once it is loaded.");

module_spk_synth(synth_soft);

MODULE_AUTHOR("Kirk Reiser <kirk@braille.uwo.ca>");
MODULE_DESCRIPTION("Speakup userspace software synthesizer support");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);
Commit	Line	Data
64969228	1	// SPDX-License-Identifier: GPL-2.0+
c6e3fd22 WH	2	/* speakup_soft.c - speakup driver to register and make available
	3	* a user space device for software synthesizers. written by: Kirk
	4	* Reiser <kirk@braille.uwo.ca>
	5	*
	6	* Copyright (C) 2003 Kirk Reiser.
	7	*
c6e3fd22	8	* this code is specificly written as a driver for the speakup screenreview
7ea8778e CM	9	* package and is not a general device driver.
7ea8778e CM	10	*/
c6e3fd22 WH	11
c6e3fd22 WH	12	#include <linux/unistd.h>
866352a8 WF	13	#include <linux/miscdevice.h> /* for misc_register, and SYNTH_MINOR */
866352a8 WF	14	#include <linux/poll.h> /* for poll_wait() */
e2d55017 BD	15
	16	/* schedule(), signal_pending(), TASK_INTERRUPTIBLE */
	17	#include <linux/sched/signal.h>
c6e3fd22 WH	18
	19	#include "spk_priv.h"
	20	#include "speakup.h"
	21
	22	#define DRV_VERSION "2.6"
	23	#define SOFTSYNTH_MINOR 26 /* might as well give it one more than /dev/synth */
425e586c	24	#define SOFTSYNTHU_MINOR 27 /* might as well give it one more than /dev/synth */
c6e3fd22 WH	25	#define PROCSPEECH 0x0d
	26	#define CLEAR_SYNTH 0x18
	27
	28	static int softsynth_probe(struct spk_synth *synth);
	29	static void softsynth_release(void);
	30	static int softsynth_is_alive(struct spk_synth *synth);
ca693dcd	31	static unsigned char get_index(struct spk_synth *synth);
c6e3fd22	32
425e586c	33	static struct miscdevice synth_device, synthu_device;
40fe4f89	34	static int init_pos;
c6e3fd22 WH	35	static int misc_registered;
	36
	37	static struct var_t vars[] = {
13f1a041 CB	38	{ CAPS_START, .u.s = {"\x01+3p" } },
13f1a041 CB	39	{ CAPS_STOP, .u.s = {"\x01-3p" } },
2610df41	40	{ PAUSE, .u.n = {"\x01P" } },
cfd75701	41	{ RATE, .u.n = {"\x01%ds", 2, 0, 9, 0, 0, NULL } },
13f1a041 CB	42	{ PITCH, .u.n = {"\x01%dp", 5, 0, 9, 0, 0, NULL } },
	43	{ VOL, .u.n = {"\x01%dv", 5, 0, 9, 0, 0, NULL } },
	44	{ TONE, .u.n = {"\x01%dx", 1, 0, 2, 0, 0, NULL } },
	45	{ PUNCT, .u.n = {"\x01%db", 0, 0, 2, 0, 0, NULL } },
	46	{ VOICE, .u.n = {"\x01%do", 0, 0, 7, 0, 0, NULL } },
	47	{ FREQUENCY, .u.n = {"\x01%df", 5, 0, 9, 0, 0, NULL } },
	48	{ DIRECT, .u.n = {NULL, 0, 0, 1, 0, 0, NULL } },
c6e3fd22 WH	49	V_LAST_VAR
	50	};
	51
866352a8 WF	52	/* These attributes will appear in /sys/accessibility/speakup/soft. */
866352a8 WF	53
c6e3fd22	54	static struct kobj_attribute caps_start_attribute =
73c3700e	55	__ATTR(caps_start, 0644, spk_var_show, spk_var_store);
c6e3fd22	56	static struct kobj_attribute caps_stop_attribute =
73c3700e	57	__ATTR(caps_stop, 0644, spk_var_show, spk_var_store);
c6e3fd22	58	static struct kobj_attribute freq_attribute =
73c3700e	59	__ATTR(freq, 0644, spk_var_show, spk_var_store);
c6e3fd22	60	static struct kobj_attribute pitch_attribute =
73c3700e	61	__ATTR(pitch, 0644, spk_var_show, spk_var_store);
c6e3fd22	62	static struct kobj_attribute punct_attribute =
73c3700e	63	__ATTR(punct, 0644, spk_var_show, spk_var_store);
c6e3fd22	64	static struct kobj_attribute rate_attribute =
73c3700e	65	__ATTR(rate, 0644, spk_var_show, spk_var_store);
c6e3fd22	66	static struct kobj_attribute tone_attribute =
73c3700e	67	__ATTR(tone, 0644, spk_var_show, spk_var_store);
c6e3fd22	68	static struct kobj_attribute voice_attribute =
73c3700e	69	__ATTR(voice, 0644, spk_var_show, spk_var_store);
c6e3fd22	70	static struct kobj_attribute vol_attribute =
73c3700e	71	__ATTR(vol, 0644, spk_var_show, spk_var_store);
c6e3fd22	72
13f1a041 CB	73	/*
	74	* We should uncomment the following definition, when we agree on a
	75	* method of passing a language designation to the software synthesizer.
	76	* static struct kobj_attribute lang_attribute =
73c3700e	77	* __ATTR(lang, 0644, spk_var_show, spk_var_store);
13f1a041 CB	78	*/
13f1a041 CB	79
c6e3fd22	80	static struct kobj_attribute delay_time_attribute =
73c3700e	81	__ATTR(delay_time, 0644, spk_var_show, spk_var_store);
c6e3fd22	82	static struct kobj_attribute direct_attribute =
73c3700e	83	__ATTR(direct, 0644, spk_var_show, spk_var_store);
c6e3fd22	84	static struct kobj_attribute full_time_attribute =
73c3700e	85	__ATTR(full_time, 0644, spk_var_show, spk_var_store);
c6e3fd22	86	static struct kobj_attribute jiffy_delta_attribute =
73c3700e	87	__ATTR(jiffy_delta, 0644, spk_var_show, spk_var_store);
c6e3fd22	88	static struct kobj_attribute trigger_time_attribute =
73c3700e	89	__ATTR(trigger_time, 0644, spk_var_show, spk_var_store);
c6e3fd22 WH	90
	91	/*
	92	* Create a group of attributes so that we can create and destroy them all
	93	* at once.
	94	*/
	95	static struct attribute *synth_attrs[] = {
	96	&caps_start_attribute.attr,
	97	&caps_stop_attribute.attr,
	98	&freq_attribute.attr,
13f1a041	99	/* &lang_attribute.attr, */
c6e3fd22 WH	100	&pitch_attribute.attr,
	101	&punct_attribute.attr,
	102	&rate_attribute.attr,
	103	&tone_attribute.attr,
	104	&voice_attribute.attr,
	105	&vol_attribute.attr,
	106	&delay_time_attribute.attr,
	107	&direct_attribute.attr,
	108	&full_time_attribute.attr,
	109	&jiffy_delta_attribute.attr,
	110	&trigger_time_attribute.attr,
	111	NULL, /* need to NULL terminate the list of attributes */
	112	};
	113
	114	static struct spk_synth synth_soft = {
	115	.name = "soft",
	116	.version = DRV_VERSION,
	117	.long_name = "software synth",
	118	.init = "\01@\x01\x31y\n",
	119	.procspeech = PROCSPEECH,
	120	.delay = 0,
	121	.trigger = 0,
	122	.jiffies = 0,
	123	.full = 0,
	124	.startup = SYNTH_START,
	125	.checkval = SYNTH_CHECK,
	126	.vars = vars,
1e441594	127	.io_ops = NULL,
c6e3fd22 WH	128	.probe = softsynth_probe,
	129	.release = softsynth_release,
	130	.synth_immediate = NULL,
	131	.catch_up = NULL,
	132	.flush = NULL,
	133	.is_alive = softsynth_is_alive,
	134	.synth_adjust = NULL,
	135	.read_buff_add = NULL,
	136	.get_index = get_index,
	137	.indexing = {
	138	.command = "\x01%di",
	139	.lowindex = 1,
	140	.highindex = 5,
	141	.currindex = 1,
	142	},
	143	.attributes = {
	144	.attrs = synth_attrs,
	145	.name = "soft",
	146	},
	147	};
	148
	149	static char *get_initstring(void)
	150	{
	151	static char buf[40];
	152	char *cp;
	153	struct var_t *var;
	154
	155	memset(buf, 0, sizeof(buf));
	156	cp = buf;
	157	var = synth_soft.vars;
	158	while (var->var_id != MAXVARS) {
59cb14b2	159	if (var->var_id != CAPS_START && var->var_id != CAPS_STOP &&
2610df41	160	var->var_id != PAUSE && var->var_id != DIRECT)
13f1a041 CB	161	cp = cp + sprintf(cp, var->u.n.synth_fmt,
13f1a041 CB	162	var->u.n.value);
c6e3fd22 WH	163	var++;
	164	}
	165	cp = cp + sprintf(cp, "\n");
	166	return buf;
	167	}
	168
	169	static int softsynth_open(struct inode inode, struct file fp)
	170	{
	171	unsigned long flags;
	172	/if ((fp->f_flags & O_ACCMODE) != O_RDONLY) /
	173	/* return -EPERM; */
89c9df1b	174	spin_lock_irqsave(&speakup_info.spinlock, flags);
c6e3fd22	175	if (synth_soft.alive) {
89c9df1b	176	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
c6e3fd22 WH	177	return -EBUSY;
	178	}
	179	synth_soft.alive = 1;
89c9df1b	180	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
c6e3fd22 WH	181	return 0;
	182	}
	183
	184	static int softsynth_close(struct inode inode, struct file fp)
	185	{
	186	unsigned long flags;
8e69a811	187
89c9df1b	188	spin_lock_irqsave(&speakup_info.spinlock, flags);
c6e3fd22	189	synth_soft.alive = 0;
40fe4f89	190	init_pos = 0;
89c9df1b	191	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
c6e3fd22 WH	192	/* Make sure we let applications go before leaving */
	193	speakup_start_ttys();
	194	return 0;
	195	}
	196
425e586c ST	197	static ssize_t softsynthx_read(struct file fp, char __user buf, size_t count,
425e586c ST	198	loff_t *pos, int unicode)
c6e3fd22 WH	199	{
c6e3fd22 WH	200	int chars_sent = 0;
7c10f1cd	201	char __user *cp;
c6e3fd22	202	char *init;
b96fba8d	203	size_t bytes_per_ch = unicode ? 3 : 1;
425e586c	204	u16 ch;
c6e3fd22 WH	205	int empty;
	206	unsigned long flags;
	207	DEFINE_WAIT(wait);
	208
b96fba8d ST	209	if (count < bytes_per_ch)
	210	return -EINVAL;
	211
89c9df1b	212	spin_lock_irqsave(&speakup_info.spinlock, flags);
45ac7b31	213	synth_soft.alive = 1;
c6e3fd22 WH	214	while (1) {
c6e3fd22 WH	215	prepare_to_wait(&speakup_event, &wait, TASK_INTERRUPTIBLE);
45ac7b31 ST	216	if (synth_current() == &synth_soft) {
	217	if (!unicode)
	218	synth_buffer_skip_nonlatin1();
	219	if (!synth_buffer_empty() \|\| speakup_info.flushing)
	220	break;
	221	}
89c9df1b	222	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
c6e3fd22 WH	223	if (fp->f_flags & O_NONBLOCK) {
	224	finish_wait(&speakup_event, &wait);
	225	return -EAGAIN;
	226	}
	227	if (signal_pending(current)) {
	228	finish_wait(&speakup_event, &wait);
	229	return -ERESTARTSYS;
	230	}
	231	schedule();
89c9df1b	232	spin_lock_irqsave(&speakup_info.spinlock, flags);
c6e3fd22 WH	233	}
	234	finish_wait(&speakup_event, &wait);
	235
	236	cp = buf;
	237	init = get_initstring();
425e586c ST	238
425e586c ST	239	/* Keep 3 bytes available for a 16bit UTF-8-encoded character */
b96fba8d	240	while (chars_sent <= count - bytes_per_ch) {
45ac7b31 ST	241	if (synth_current() != &synth_soft)
45ac7b31 ST	242	break;
c6e3fd22 WH	243	if (speakup_info.flushing) {
	244	speakup_info.flushing = 0;
	245	ch = '\x18';
40fe4f89 BH	246	} else if (init[init_pos]) {
40fe4f89 BH	247	ch = init[init_pos++];
c6e3fd22	248	} else {
425e586c ST	249	if (!unicode)
	250	synth_buffer_skip_nonlatin1();
	251	if (synth_buffer_empty())
	252	break;
c6e3fd22 WH	253	ch = synth_buffer_getc();
c6e3fd22 WH	254	}
89c9df1b	255	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
425e586c ST	256
	257	if ((!unicode && ch < 0x100) \|\| (unicode && ch < 0x80)) {
	258	u_char c = ch;
	259
	260	if (copy_to_user(cp, &c, 1))
	261	return -EFAULT;
	262
	263	chars_sent++;
	264	cp++;
	265	} else if (unicode && ch < 0x800) {
	266	u_char s[2] = {
	267	0xc0 \| (ch >> 6),
	268	0x80 \| (ch & 0x3f)
	269	};
	270
	271	if (copy_to_user(cp, s, sizeof(s)))
	272	return -EFAULT;
	273
	274	chars_sent += sizeof(s);
	275	cp += sizeof(s);
	276	} else if (unicode) {
	277	u_char s[3] = {
	278	0xe0 \| (ch >> 12),
	279	0x80 \| ((ch >> 6) & 0x3f),
	280	0x80 \| (ch & 0x3f)
	281	};
	282
	283	if (copy_to_user(cp, s, sizeof(s)))
	284	return -EFAULT;
	285
	286	chars_sent += sizeof(s);
	287	cp += sizeof(s);
	288	}
	289
89c9df1b	290	spin_lock_irqsave(&speakup_info.spinlock, flags);
c6e3fd22 WH	291	}
	292	*pos += chars_sent;
	293	empty = synth_buffer_empty();
89c9df1b	294	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
c6e3fd22 WH	295	if (empty) {
	296	speakup_start_ttys();
	297	*pos = 0;
	298	}
	299	return chars_sent;
	300	}
	301
425e586c ST	302	static ssize_t softsynth_read(struct file fp, char __user buf, size_t count,
	303	loff_t *pos)
	304	{
	305	return softsynthx_read(fp, buf, count, pos, 0);
	306	}
	307
	308	static ssize_t softsynthu_read(struct file fp, char __user buf, size_t count,
	309	loff_t *pos)
	310	{
	311	return softsynthx_read(fp, buf, count, pos, 1);
	312	}
	313
13f1a041	314	static int last_index;
c6e3fd22	315
7c10f1cd EG	316	static ssize_t softsynth_write(struct file fp, const char __user buf,
7c10f1cd EG	317	size_t count, loff_t *pos)
c6e3fd22	318	{
13f1a041 CB	319	unsigned long supplied_index = 0;
13f1a041 CB	320	int converted;
c6e3fd22	321
6263ba55	322	converted = kstrtoul_from_user(buf, count, 0, &supplied_index);
13f1a041 CB	323
	324	if (converted < 0)
	325	return converted;
c6e3fd22	326
13f1a041	327	last_index = supplied_index;
c6e3fd22 WH	328	return count;
	329	}
	330
afc9a42b	331	static __poll_t softsynth_poll(struct file fp, struct poll_table_struct wait)
c6e3fd22 WH	332	{
c6e3fd22 WH	333	unsigned long flags;
afc9a42b	334	__poll_t ret = 0;
8e69a811	335
c6e3fd22 WH	336	poll_wait(fp, &speakup_event, wait);
c6e3fd22 WH	337
89c9df1b	338	spin_lock_irqsave(&speakup_info.spinlock, flags);
45ac7b31 ST	339	if (synth_current() == &synth_soft &&
45ac7b31 ST	340	(!synth_buffer_empty() \|\| speakup_info.flushing))
a9a08845	341	ret = EPOLLIN \| EPOLLRDNORM;
89c9df1b	342	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
c6e3fd22 WH	343	return ret;
	344	}
	345
ca693dcd	346	static unsigned char get_index(struct spk_synth *synth)
c6e3fd22 WH	347	{
c6e3fd22 WH	348	int rv;
8e69a811	349
c6e3fd22 WH	350	rv = last_index;
	351	last_index = 0;
	352	return rv;
	353	}
	354
13f1a041	355	static const struct file_operations softsynth_fops = {
c6e3fd22 WH	356	.owner = THIS_MODULE,
	357	.poll = softsynth_poll,
	358	.read = softsynth_read,
	359	.write = softsynth_write,
	360	.open = softsynth_open,
	361	.release = softsynth_close,
	362	};
	363
425e586c ST	364	static const struct file_operations softsynthu_fops = {
	365	.owner = THIS_MODULE,
	366	.poll = softsynth_poll,
	367	.read = softsynthu_read,
	368	.write = softsynth_write,
	369	.open = softsynth_open,
	370	.release = softsynth_close,
	371	};
	372
c6e3fd22 WH	373	static int softsynth_probe(struct spk_synth *synth)
c6e3fd22 WH	374	{
c6e3fd22 WH	375	if (misc_registered != 0)
	376	return 0;
	377	memset(&synth_device, 0, sizeof(synth_device));
	378	synth_device.minor = SOFTSYNTH_MINOR;
	379	synth_device.name = "softsynth";
	380	synth_device.fops = &softsynth_fops;
	381	if (misc_register(&synth_device)) {
	382	pr_warn("Couldn't initialize miscdevice /dev/softsynth.\n");
	383	return -ENODEV;
	384	}
	385
425e586c ST	386	memset(&synthu_device, 0, sizeof(synthu_device));
	387	synthu_device.minor = SOFTSYNTHU_MINOR;
	388	synthu_device.name = "softsynthu";
	389	synthu_device.fops = &softsynthu_fops;
	390	if (misc_register(&synthu_device)) {
8080b0f5	391	pr_warn("Couldn't initialize miscdevice /dev/softsynthu.\n");
425e586c ST	392	return -ENODEV;
	393	}
	394
c6e3fd22 WH	395	misc_registered = 1;
c6e3fd22 WH	396	pr_info("initialized device: /dev/softsynth, node (MAJOR 10, MINOR 26)\n");
425e586c	397	pr_info("initialized device: /dev/softsynthu, node (MAJOR 10, MINOR 27)\n");
c6e3fd22 WH	398	return 0;
	399	}
	400
	401	static void softsynth_release(void)
	402	{
	403	misc_deregister(&synth_device);
425e586c	404	misc_deregister(&synthu_device);
c6e3fd22 WH	405	misc_registered = 0;
c6e3fd22 WH	406	pr_info("unregistered /dev/softsynth\n");
425e586c	407	pr_info("unregistered /dev/softsynthu\n");
c6e3fd22 WH	408	}
	409
	410	static int softsynth_is_alive(struct spk_synth *synth)
	411	{
	412	if (synth_soft.alive)
	413	return 1;
	414	return 0;
	415	}
	416
73c3700e	417	module_param_named(start, synth_soft.startup, short, 0444);
c6e3fd22 WH	418
	419	MODULE_PARM_DESC(start, "Start the synthesizer once it is loaded.");
	420
ae89facc	421	module_spk_synth(synth_soft);
c6e3fd22	422
c6e3fd22 WH	423	MODULE_AUTHOR("Kirk Reiser <kirk@braille.uwo.ca>");
	424	MODULE_DESCRIPTION("Speakup userspace software synthesizer support");
	425	MODULE_LICENSE("GPL");
	426	MODULE_VERSION(DRV_VERSION);