[mirror_ubuntu-artful-kernel.git] / drivers / staging / speakup / speakup_soft.c

/* 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 program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 *
 * 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() */
#include <linux/sched/signal.h> /* schedule(), signal_pending(), TASK_INTERRUPTIBLE */

#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 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(void);

static struct miscdevice synth_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" } },
	{ 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,
	.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 != 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 softsynth_read(struct file *fp, char __user *buf, size_t count,
			      loff_t *pos)
{
	int chars_sent = 0;
	char __user *cp;
	char *init;
	char ch;
	int empty;
	unsigned long flags;
	DEFINE_WAIT(wait);

	spin_lock_irqsave(&speakup_info.spinlock, flags);
	while (1) {
		prepare_to_wait(&speakup_event, &wait, TASK_INTERRUPTIBLE);
		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();
	while (chars_sent < count) {
		if (speakup_info.flushing) {
			speakup_info.flushing = 0;
			ch = '\x18';
		} else if (synth_buffer_empty()) {
			break;
		} else if (init[init_pos]) {
			ch = init[init_pos++];
		} else {
			ch = synth_buffer_getc();
		}
		spin_unlock_irqrestore(&speakup_info.spinlock, flags);
		if (copy_to_user(cp, &ch, 1))
			return -EFAULT;
		spin_lock_irqsave(&speakup_info.spinlock, flags);
		chars_sent++;
		cp++;
	}
	*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 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 unsigned int softsynth_poll(struct file *fp, struct poll_table_struct *wait)
{
	unsigned long flags;
	int ret = 0;

	poll_wait(fp, &speakup_event, wait);

	spin_lock_irqsave(&speakup_info.spinlock, flags);
	if (!synth_buffer_empty() || speakup_info.flushing)
		ret = POLLIN | POLLRDNORM;
	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
	return ret;
}

static unsigned char get_index(void)
{
	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 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;
	}

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

static void softsynth_release(void)
{
	misc_deregister(&synth_device);
	misc_registered = 0;
	pr_info("unregistered /dev/softsynth\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
c6e3fd22 WH	1	/* speakup_soft.c - speakup driver to register and make available
	2	* a user space device for software synthesizers. written by: Kirk
	3	* Reiser <kirk@braille.uwo.ca>
	4	*
	5	* Copyright (C) 2003 Kirk Reiser.
	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
c6e3fd22 WH	17	*
c6e3fd22 WH	18	* this code is specificly written as a driver for the speakup screenreview
7ea8778e CM	19	* package and is not a general device driver.
7ea8778e CM	20	*/
c6e3fd22 WH	21
c6e3fd22 WH	22	#include <linux/unistd.h>
866352a8 WF	23	#include <linux/miscdevice.h> /* for misc_register, and SYNTH_MINOR */
866352a8 WF	24	#include <linux/poll.h> /* for poll_wait() */
174cd4b1	25	#include <linux/sched/signal.h> /* schedule(), signal_pending(), TASK_INTERRUPTIBLE */
c6e3fd22 WH	26
	27	#include "spk_priv.h"
	28	#include "speakup.h"
	29
	30	#define DRV_VERSION "2.6"
	31	#define SOFTSYNTH_MINOR 26 /* might as well give it one more than /dev/synth */
	32	#define PROCSPEECH 0x0d
	33	#define CLEAR_SYNTH 0x18
	34
	35	static int softsynth_probe(struct spk_synth *synth);
	36	static void softsynth_release(void);
	37	static int softsynth_is_alive(struct spk_synth *synth);
	38	static unsigned char get_index(void);
	39
	40	static struct miscdevice synth_device;
40fe4f89	41	static int init_pos;
c6e3fd22 WH	42	static int misc_registered;
	43
	44	static struct var_t vars[] = {
13f1a041 CB	45	{ CAPS_START, .u.s = {"\x01+3p" } },
13f1a041 CB	46	{ CAPS_STOP, .u.s = {"\x01-3p" } },
cfd75701	47	{ RATE, .u.n = {"\x01%ds", 2, 0, 9, 0, 0, NULL } },
13f1a041 CB	48	{ PITCH, .u.n = {"\x01%dp", 5, 0, 9, 0, 0, NULL } },
	49	{ VOL, .u.n = {"\x01%dv", 5, 0, 9, 0, 0, NULL } },
	50	{ TONE, .u.n = {"\x01%dx", 1, 0, 2, 0, 0, NULL } },
	51	{ PUNCT, .u.n = {"\x01%db", 0, 0, 2, 0, 0, NULL } },
	52	{ VOICE, .u.n = {"\x01%do", 0, 0, 7, 0, 0, NULL } },
	53	{ FREQUENCY, .u.n = {"\x01%df", 5, 0, 9, 0, 0, NULL } },
	54	{ DIRECT, .u.n = {NULL, 0, 0, 1, 0, 0, NULL } },
c6e3fd22 WH	55	V_LAST_VAR
	56	};
	57
866352a8 WF	58	/* These attributes will appear in /sys/accessibility/speakup/soft. */
866352a8 WF	59
c6e3fd22	60	static struct kobj_attribute caps_start_attribute =
73c3700e	61	__ATTR(caps_start, 0644, spk_var_show, spk_var_store);
c6e3fd22	62	static struct kobj_attribute caps_stop_attribute =
73c3700e	63	__ATTR(caps_stop, 0644, spk_var_show, spk_var_store);
c6e3fd22	64	static struct kobj_attribute freq_attribute =
73c3700e	65	__ATTR(freq, 0644, spk_var_show, spk_var_store);
c6e3fd22	66	static struct kobj_attribute pitch_attribute =
73c3700e	67	__ATTR(pitch, 0644, spk_var_show, spk_var_store);
c6e3fd22	68	static struct kobj_attribute punct_attribute =
73c3700e	69	__ATTR(punct, 0644, spk_var_show, spk_var_store);
c6e3fd22	70	static struct kobj_attribute rate_attribute =
73c3700e	71	__ATTR(rate, 0644, spk_var_show, spk_var_store);
c6e3fd22	72	static struct kobj_attribute tone_attribute =
73c3700e	73	__ATTR(tone, 0644, spk_var_show, spk_var_store);
c6e3fd22	74	static struct kobj_attribute voice_attribute =
73c3700e	75	__ATTR(voice, 0644, spk_var_show, spk_var_store);
c6e3fd22	76	static struct kobj_attribute vol_attribute =
73c3700e	77	__ATTR(vol, 0644, spk_var_show, spk_var_store);
c6e3fd22	78
13f1a041 CB	79	/*
	80	* We should uncomment the following definition, when we agree on a
	81	* method of passing a language designation to the software synthesizer.
	82	* static struct kobj_attribute lang_attribute =
73c3700e	83	* __ATTR(lang, 0644, spk_var_show, spk_var_store);
13f1a041 CB	84	*/
13f1a041 CB	85
c6e3fd22	86	static struct kobj_attribute delay_time_attribute =
73c3700e	87	__ATTR(delay_time, 0644, spk_var_show, spk_var_store);
c6e3fd22	88	static struct kobj_attribute direct_attribute =
73c3700e	89	__ATTR(direct, 0644, spk_var_show, spk_var_store);
c6e3fd22	90	static struct kobj_attribute full_time_attribute =
73c3700e	91	__ATTR(full_time, 0644, spk_var_show, spk_var_store);
c6e3fd22	92	static struct kobj_attribute jiffy_delta_attribute =
73c3700e	93	__ATTR(jiffy_delta, 0644, spk_var_show, spk_var_store);
c6e3fd22	94	static struct kobj_attribute trigger_time_attribute =
73c3700e	95	__ATTR(trigger_time, 0644, spk_var_show, spk_var_store);
c6e3fd22 WH	96
	97	/*
	98	* Create a group of attributes so that we can create and destroy them all
	99	* at once.
	100	*/
	101	static struct attribute *synth_attrs[] = {
	102	&caps_start_attribute.attr,
	103	&caps_stop_attribute.attr,
	104	&freq_attribute.attr,
13f1a041	105	/* &lang_attribute.attr, */
c6e3fd22 WH	106	&pitch_attribute.attr,
	107	&punct_attribute.attr,
	108	&rate_attribute.attr,
	109	&tone_attribute.attr,
	110	&voice_attribute.attr,
	111	&vol_attribute.attr,
	112	&delay_time_attribute.attr,
	113	&direct_attribute.attr,
	114	&full_time_attribute.attr,
	115	&jiffy_delta_attribute.attr,
	116	&trigger_time_attribute.attr,
	117	NULL, /* need to NULL terminate the list of attributes */
	118	};
	119
	120	static struct spk_synth synth_soft = {
	121	.name = "soft",
	122	.version = DRV_VERSION,
	123	.long_name = "software synth",
	124	.init = "\01@\x01\x31y\n",
	125	.procspeech = PROCSPEECH,
	126	.delay = 0,
	127	.trigger = 0,
	128	.jiffies = 0,
	129	.full = 0,
	130	.startup = SYNTH_START,
	131	.checkval = SYNTH_CHECK,
	132	.vars = vars,
	133	.probe = softsynth_probe,
	134	.release = softsynth_release,
	135	.synth_immediate = NULL,
	136	.catch_up = NULL,
	137	.flush = NULL,
	138	.is_alive = softsynth_is_alive,
	139	.synth_adjust = NULL,
	140	.read_buff_add = NULL,
	141	.get_index = get_index,
	142	.indexing = {
	143	.command = "\x01%di",
	144	.lowindex = 1,
	145	.highindex = 5,
	146	.currindex = 1,
	147	},
	148	.attributes = {
	149	.attrs = synth_attrs,
	150	.name = "soft",
	151	},
	152	};
	153
	154	static char *get_initstring(void)
	155	{
	156	static char buf[40];
	157	char *cp;
	158	struct var_t *var;
	159
	160	memset(buf, 0, sizeof(buf));
	161	cp = buf;
	162	var = synth_soft.vars;
	163	while (var->var_id != MAXVARS) {
59cb14b2 WF	164	if (var->var_id != CAPS_START && var->var_id != CAPS_STOP &&
59cb14b2 WF	165	var->var_id != DIRECT)
13f1a041 CB	166	cp = cp + sprintf(cp, var->u.n.synth_fmt,
13f1a041 CB	167	var->u.n.value);
c6e3fd22 WH	168	var++;
	169	}
	170	cp = cp + sprintf(cp, "\n");
	171	return buf;
	172	}
	173
	174	static int softsynth_open(struct inode inode, struct file fp)
	175	{
	176	unsigned long flags;
	177	/if ((fp->f_flags & O_ACCMODE) != O_RDONLY) /
	178	/* return -EPERM; */
89c9df1b	179	spin_lock_irqsave(&speakup_info.spinlock, flags);
c6e3fd22	180	if (synth_soft.alive) {
89c9df1b	181	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
c6e3fd22 WH	182	return -EBUSY;
	183	}
	184	synth_soft.alive = 1;
89c9df1b	185	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
c6e3fd22 WH	186	return 0;
	187	}
	188
	189	static int softsynth_close(struct inode inode, struct file fp)
	190	{
	191	unsigned long flags;
8e69a811	192
89c9df1b	193	spin_lock_irqsave(&speakup_info.spinlock, flags);
c6e3fd22	194	synth_soft.alive = 0;
40fe4f89	195	init_pos = 0;
89c9df1b	196	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
c6e3fd22 WH	197	/* Make sure we let applications go before leaving */
	198	speakup_start_ttys();
	199	return 0;
	200	}
	201
7c10f1cd	202	static ssize_t softsynth_read(struct file fp, char __user buf, size_t count,
c6e3fd22 WH	203	loff_t *pos)
	204	{
	205	int chars_sent = 0;
7c10f1cd	206	char __user *cp;
c6e3fd22 WH	207	char *init;
	208	char ch;
	209	int empty;
	210	unsigned long flags;
	211	DEFINE_WAIT(wait);
	212
89c9df1b	213	spin_lock_irqsave(&speakup_info.spinlock, flags);
c6e3fd22 WH	214	while (1) {
	215	prepare_to_wait(&speakup_event, &wait, TASK_INTERRUPTIBLE);
	216	if (!synth_buffer_empty() \|\| speakup_info.flushing)
	217	break;
89c9df1b	218	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
c6e3fd22 WH	219	if (fp->f_flags & O_NONBLOCK) {
	220	finish_wait(&speakup_event, &wait);
	221	return -EAGAIN;
	222	}
	223	if (signal_pending(current)) {
	224	finish_wait(&speakup_event, &wait);
	225	return -ERESTARTSYS;
	226	}
	227	schedule();
89c9df1b	228	spin_lock_irqsave(&speakup_info.spinlock, flags);
c6e3fd22 WH	229	}
	230	finish_wait(&speakup_event, &wait);
	231
	232	cp = buf;
	233	init = get_initstring();
	234	while (chars_sent < count) {
	235	if (speakup_info.flushing) {
	236	speakup_info.flushing = 0;
	237	ch = '\x18';
	238	} else if (synth_buffer_empty()) {
	239	break;
40fe4f89 BH	240	} else if (init[init_pos]) {
40fe4f89 BH	241	ch = init[init_pos++];
c6e3fd22 WH	242	} else {
	243	ch = synth_buffer_getc();
	244	}
89c9df1b	245	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
c6e3fd22 WH	246	if (copy_to_user(cp, &ch, 1))
c6e3fd22 WH	247	return -EFAULT;
89c9df1b	248	spin_lock_irqsave(&speakup_info.spinlock, flags);
c6e3fd22 WH	249	chars_sent++;
	250	cp++;
	251	}
	252	*pos += chars_sent;
	253	empty = synth_buffer_empty();
89c9df1b	254	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
c6e3fd22 WH	255	if (empty) {
	256	speakup_start_ttys();
	257	*pos = 0;
	258	}
	259	return chars_sent;
	260	}
	261
13f1a041	262	static int last_index;
c6e3fd22	263
7c10f1cd EG	264	static ssize_t softsynth_write(struct file fp, const char __user buf,
7c10f1cd EG	265	size_t count, loff_t *pos)
c6e3fd22	266	{
13f1a041 CB	267	unsigned long supplied_index = 0;
13f1a041 CB	268	int converted;
c6e3fd22	269
6263ba55	270	converted = kstrtoul_from_user(buf, count, 0, &supplied_index);
13f1a041 CB	271
	272	if (converted < 0)
	273	return converted;
c6e3fd22	274
13f1a041	275	last_index = supplied_index;
c6e3fd22 WH	276	return count;
	277	}
	278
469554a1	279	static unsigned int softsynth_poll(struct file fp, struct poll_table_struct wait)
c6e3fd22 WH	280	{
	281	unsigned long flags;
	282	int ret = 0;
8e69a811	283
c6e3fd22 WH	284	poll_wait(fp, &speakup_event, wait);
c6e3fd22 WH	285
89c9df1b	286	spin_lock_irqsave(&speakup_info.spinlock, flags);
13f1a041	287	if (!synth_buffer_empty() \|\| speakup_info.flushing)
c6e3fd22	288	ret = POLLIN \| POLLRDNORM;
89c9df1b	289	spin_unlock_irqrestore(&speakup_info.spinlock, flags);
c6e3fd22 WH	290	return ret;
	291	}
	292
	293	static unsigned char get_index(void)
	294	{
	295	int rv;
8e69a811	296
c6e3fd22 WH	297	rv = last_index;
	298	last_index = 0;
	299	return rv;
	300	}
	301
13f1a041	302	static const struct file_operations softsynth_fops = {
c6e3fd22 WH	303	.owner = THIS_MODULE,
	304	.poll = softsynth_poll,
	305	.read = softsynth_read,
	306	.write = softsynth_write,
	307	.open = softsynth_open,
	308	.release = softsynth_close,
	309	};
	310
c6e3fd22 WH	311	static int softsynth_probe(struct spk_synth *synth)
c6e3fd22 WH	312	{
c6e3fd22 WH	313	if (misc_registered != 0)
	314	return 0;
	315	memset(&synth_device, 0, sizeof(synth_device));
	316	synth_device.minor = SOFTSYNTH_MINOR;
	317	synth_device.name = "softsynth";
	318	synth_device.fops = &softsynth_fops;
	319	if (misc_register(&synth_device)) {
	320	pr_warn("Couldn't initialize miscdevice /dev/softsynth.\n");
	321	return -ENODEV;
	322	}
	323
	324	misc_registered = 1;
	325	pr_info("initialized device: /dev/softsynth, node (MAJOR 10, MINOR 26)\n");
	326	return 0;
	327	}
	328
	329	static void softsynth_release(void)
	330	{
	331	misc_deregister(&synth_device);
	332	misc_registered = 0;
	333	pr_info("unregistered /dev/softsynth\n");
	334	}
	335
	336	static int softsynth_is_alive(struct spk_synth *synth)
	337	{
	338	if (synth_soft.alive)
	339	return 1;
	340	return 0;
	341	}
	342
73c3700e	343	module_param_named(start, synth_soft.startup, short, 0444);
c6e3fd22 WH	344
	345	MODULE_PARM_DESC(start, "Start the synthesizer once it is loaded.");
	346
ae89facc	347	module_spk_synth(synth_soft);
c6e3fd22	348
c6e3fd22 WH	349	MODULE_AUTHOR("Kirk Reiser <kirk@braille.uwo.ca>");
	350	MODULE_DESCRIPTION("Speakup userspace software synthesizer support");
	351	MODULE_LICENSE("GPL");
	352	MODULE_VERSION(DRV_VERSION);