diff options
Diffstat (limited to 'drivers/accessibility/speakup/synth.c')
| -rw-r--r-- | drivers/accessibility/speakup/synth.c | 493 |
1 files changed, 493 insertions, 0 deletions
diff --git a/drivers/accessibility/speakup/synth.c b/drivers/accessibility/speakup/synth.c new file mode 100644 index 0000000000..eea2a2fa4f --- /dev/null +++ b/drivers/accessibility/speakup/synth.c @@ -0,0 +1,493 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/types.h> +#include <linux/ctype.h> /* for isdigit() and friends */ +#include <linux/fs.h> +#include <linux/mm.h> /* for verify_area */ +#include <linux/errno.h> /* for -EBUSY */ +#include <linux/ioport.h> /* for check_region, request_region */ +#include <linux/interrupt.h> +#include <linux/delay.h> /* for loops_per_sec */ +#include <linux/kmod.h> +#include <linux/jiffies.h> +#include <linux/uaccess.h> /* for copy_from_user */ +#include <linux/sched.h> +#include <linux/timer.h> +#include <linux/kthread.h> + +#include "spk_priv.h" +#include "speakup.h" +#include "serialio.h" + +static LIST_HEAD(synths); +struct spk_synth *synth; +char spk_pitch_buff[32] = ""; +static int module_status; +bool spk_quiet_boot; + +struct speakup_info_t speakup_info = { + /* + * This spinlock is used to protect the entire speakup machinery, and + * must be taken at each kernel->speakup transition and released at + * each corresponding speakup->kernel transition. + * + * The progression thread only interferes with the speakup machinery + * through the synth buffer, so only needs to take the lock + * while tinkering with the buffer. + * + * We use spin_lock/trylock_irqsave and spin_unlock_irqrestore with this + * spinlock because speakup needs to disable the keyboard IRQ. + */ + .spinlock = __SPIN_LOCK_UNLOCKED(speakup_info.spinlock), + .flushing = 0, +}; +EXPORT_SYMBOL_GPL(speakup_info); + +static int do_synth_init(struct spk_synth *in_synth); + +/* + * Main loop of the progression thread: keep eating from the buffer + * and push to the serial port, waiting as needed + * + * For devices that have a "full" notification mechanism, the driver can + * adapt the loop the way they prefer. + */ +static void _spk_do_catch_up(struct spk_synth *synth, int unicode) +{ + u16 ch; + unsigned long flags; + unsigned long jiff_max; + struct var_t *delay_time; + struct var_t *full_time; + struct var_t *jiffy_delta; + int jiffy_delta_val; + int delay_time_val; + int full_time_val; + int ret; + + jiffy_delta = spk_get_var(JIFFY); + full_time = spk_get_var(FULL); + delay_time = spk_get_var(DELAY); + + spin_lock_irqsave(&speakup_info.spinlock, flags); + jiffy_delta_val = jiffy_delta->u.n.value; + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + + jiff_max = jiffies + jiffy_delta_val; + while (!kthread_should_stop()) { + spin_lock_irqsave(&speakup_info.spinlock, flags); + if (speakup_info.flushing) { + speakup_info.flushing = 0; + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + synth->flush(synth); + continue; + } + if (!unicode) + synth_buffer_skip_nonlatin1(); + if (synth_buffer_empty()) { + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + break; + } + ch = synth_buffer_peek(); + set_current_state(TASK_INTERRUPTIBLE); + full_time_val = full_time->u.n.value; + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + if (ch == '\n') + ch = synth->procspeech; + if (unicode) + ret = synth->io_ops->synth_out_unicode(synth, ch); + else + ret = synth->io_ops->synth_out(synth, ch); + if (!ret) { + schedule_timeout(msecs_to_jiffies(full_time_val)); + continue; + } + if (time_after_eq(jiffies, jiff_max) && (ch == SPACE)) { + spin_lock_irqsave(&speakup_info.spinlock, flags); + jiffy_delta_val = jiffy_delta->u.n.value; + delay_time_val = delay_time->u.n.value; + full_time_val = full_time->u.n.value; + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + if (synth->io_ops->synth_out(synth, synth->procspeech)) + schedule_timeout( + msecs_to_jiffies(delay_time_val)); + else + schedule_timeout( + msecs_to_jiffies(full_time_val)); + jiff_max = jiffies + jiffy_delta_val; + } + set_current_state(TASK_RUNNING); + spin_lock_irqsave(&speakup_info.spinlock, flags); + synth_buffer_getc(); + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + } + synth->io_ops->synth_out(synth, synth->procspeech); +} + +void spk_do_catch_up(struct spk_synth *synth) +{ + _spk_do_catch_up(synth, 0); +} +EXPORT_SYMBOL_GPL(spk_do_catch_up); + +void spk_do_catch_up_unicode(struct spk_synth *synth) +{ + _spk_do_catch_up(synth, 1); +} +EXPORT_SYMBOL_GPL(spk_do_catch_up_unicode); + +void spk_synth_flush(struct spk_synth *synth) +{ + synth->io_ops->flush_buffer(synth); + synth->io_ops->synth_out(synth, synth->clear); +} +EXPORT_SYMBOL_GPL(spk_synth_flush); + +unsigned char spk_synth_get_index(struct spk_synth *synth) +{ + return synth->io_ops->synth_in_nowait(synth); +} +EXPORT_SYMBOL_GPL(spk_synth_get_index); + +int spk_synth_is_alive_nop(struct spk_synth *synth) +{ + synth->alive = 1; + return 1; +} +EXPORT_SYMBOL_GPL(spk_synth_is_alive_nop); + +int spk_synth_is_alive_restart(struct spk_synth *synth) +{ + if (synth->alive) + return 1; + if (synth->io_ops->wait_for_xmitr(synth) > 0) { + /* restart */ + synth->alive = 1; + synth_printf("%s", synth->init); + return 2; /* reenabled */ + } + pr_warn("%s: can't restart synth\n", synth->long_name); + return 0; +} +EXPORT_SYMBOL_GPL(spk_synth_is_alive_restart); + +static void thread_wake_up(struct timer_list *unused) +{ + wake_up_interruptible_all(&speakup_event); +} + +static DEFINE_TIMER(thread_timer, thread_wake_up); + +void synth_start(void) +{ + struct var_t *trigger_time; + + if (!synth->alive) { + synth_buffer_clear(); + return; + } + trigger_time = spk_get_var(TRIGGER); + if (!timer_pending(&thread_timer)) + mod_timer(&thread_timer, jiffies + + msecs_to_jiffies(trigger_time->u.n.value)); +} + +void spk_do_flush(void) +{ + if (!synth) + return; + + speakup_info.flushing = 1; + synth_buffer_clear(); + if (synth->alive) { + if (spk_pitch_shift) { + synth_printf("%s", spk_pitch_buff); + spk_pitch_shift = 0; + } + } + wake_up_interruptible_all(&speakup_event); + wake_up_process(speakup_task); +} + +void synth_write(const char *buf, size_t count) +{ + while (count--) + synth_buffer_add(*buf++); + synth_start(); +} + +void synth_printf(const char *fmt, ...) +{ + va_list args; + unsigned char buf[160], *p; + int r; + + va_start(args, fmt); + r = vsnprintf(buf, sizeof(buf), fmt, args); + va_end(args); + if (r > sizeof(buf) - 1) + r = sizeof(buf) - 1; + + p = buf; + while (r--) + synth_buffer_add(*p++); + synth_start(); +} +EXPORT_SYMBOL_GPL(synth_printf); + +void synth_putwc(u16 wc) +{ + synth_buffer_add(wc); +} +EXPORT_SYMBOL_GPL(synth_putwc); + +void synth_putwc_s(u16 wc) +{ + synth_buffer_add(wc); + synth_start(); +} +EXPORT_SYMBOL_GPL(synth_putwc_s); + +void synth_putws(const u16 *buf) +{ + const u16 *p; + + for (p = buf; *p; p++) + synth_buffer_add(*p); +} +EXPORT_SYMBOL_GPL(synth_putws); + +void synth_putws_s(const u16 *buf) +{ + synth_putws(buf); + synth_start(); +} +EXPORT_SYMBOL_GPL(synth_putws_s); + +static int index_count; +static int sentence_count; + +void spk_reset_index_count(int sc) +{ + static int first = 1; + + if (first) + first = 0; + else + synth->get_index(synth); + index_count = 0; + sentence_count = sc; +} + +int synth_supports_indexing(void) +{ + if (synth->get_index) + return 1; + return 0; +} + +void synth_insert_next_index(int sent_num) +{ + int out; + + if (synth->alive) { + if (sent_num == 0) { + synth->indexing.currindex++; + index_count++; + if (synth->indexing.currindex > + synth->indexing.highindex) + synth->indexing.currindex = + synth->indexing.lowindex; + } + + out = synth->indexing.currindex * 10 + sent_num; + synth_printf(synth->indexing.command, out, out); + } +} + +void spk_get_index_count(int *linecount, int *sentcount) +{ + int ind = synth->get_index(synth); + + if (ind) { + sentence_count = ind % 10; + + if ((ind / 10) <= synth->indexing.currindex) + index_count = synth->indexing.currindex - (ind / 10); + else + index_count = synth->indexing.currindex + - synth->indexing.lowindex + + synth->indexing.highindex - (ind / 10) + 1; + } + *sentcount = sentence_count; + *linecount = index_count; +} + +static struct resource synth_res; + +int synth_request_region(unsigned long start, unsigned long n) +{ + struct resource *parent = &ioport_resource; + + memset(&synth_res, 0, sizeof(synth_res)); + synth_res.name = synth->name; + synth_res.start = start; + synth_res.end = start + n - 1; + synth_res.flags = IORESOURCE_BUSY; + return request_resource(parent, &synth_res); +} +EXPORT_SYMBOL_GPL(synth_request_region); + +int synth_release_region(unsigned long start, unsigned long n) +{ + return release_resource(&synth_res); +} +EXPORT_SYMBOL_GPL(synth_release_region); + +struct var_t synth_time_vars[] = { + { DELAY, .u.n = {NULL, 100, 100, 2000, 0, 0, NULL } }, + { TRIGGER, .u.n = {NULL, 20, 10, 2000, 0, 0, NULL } }, + { JIFFY, .u.n = {NULL, 50, 20, 200, 0, 0, NULL } }, + { FULL, .u.n = {NULL, 400, 200, 60000, 0, 0, NULL } }, + { FLUSH, .u.n = {NULL, 4000, 10, 4000, 0, 0, NULL } }, + V_LAST_VAR +}; + +/* called by: speakup_init() */ +int synth_init(char *synth_name) +{ + int ret = 0; + struct spk_synth *tmp, *synth = NULL; + + if (!synth_name) + return 0; + + if (strcmp(synth_name, "none") == 0) { + mutex_lock(&spk_mutex); + synth_release(); + mutex_unlock(&spk_mutex); + return 0; + } + + mutex_lock(&spk_mutex); + /* First, check if we already have it loaded. */ + list_for_each_entry(tmp, &synths, node) { + if (strcmp(tmp->name, synth_name) == 0) + synth = tmp; + } + + /* If we got one, initialize it now. */ + if (synth) + ret = do_synth_init(synth); + else + ret = -ENODEV; + mutex_unlock(&spk_mutex); + + return ret; +} + +/* called by: synth_add() */ +static int do_synth_init(struct spk_synth *in_synth) +{ + struct var_t *var; + + synth_release(); + if (in_synth->checkval != SYNTH_CHECK) + return -EINVAL; + synth = in_synth; + synth->alive = 0; + pr_warn("synth probe\n"); + if (synth->probe(synth) < 0) { + pr_warn("%s: device probe failed\n", in_synth->name); + synth = NULL; + return -ENODEV; + } + synth_time_vars[0].u.n.value = + synth_time_vars[0].u.n.default_val = synth->delay; + synth_time_vars[1].u.n.value = + synth_time_vars[1].u.n.default_val = synth->trigger; + synth_time_vars[2].u.n.value = + synth_time_vars[2].u.n.default_val = synth->jiffies; + synth_time_vars[3].u.n.value = + synth_time_vars[3].u.n.default_val = synth->full; + synth_time_vars[4].u.n.value = + synth_time_vars[4].u.n.default_val = synth->flush_time; + synth_printf("%s", synth->init); + for (var = synth->vars; + (var->var_id >= 0) && (var->var_id < MAXVARS); var++) + speakup_register_var(var); + if (!spk_quiet_boot) + synth_printf("%s found\n", synth->long_name); + if (synth->attributes.name && + sysfs_create_group(speakup_kobj, &synth->attributes) < 0) + return -ENOMEM; + synth_flags = synth->flags; + wake_up_interruptible_all(&speakup_event); + if (speakup_task) + wake_up_process(speakup_task); + return 0; +} + +void synth_release(void) +{ + struct var_t *var; + unsigned long flags; + + if (!synth) + return; + spin_lock_irqsave(&speakup_info.spinlock, flags); + pr_info("releasing synth %s\n", synth->name); + synth->alive = 0; + del_timer(&thread_timer); + spin_unlock_irqrestore(&speakup_info.spinlock, flags); + if (synth->attributes.name) + sysfs_remove_group(speakup_kobj, &synth->attributes); + for (var = synth->vars; var->var_id != MAXVARS; var++) + speakup_unregister_var(var->var_id); + synth->release(synth); + synth = NULL; +} + +/* called by: all_driver_init() */ +int synth_add(struct spk_synth *in_synth) +{ + int status = 0; + struct spk_synth *tmp; + + mutex_lock(&spk_mutex); + + list_for_each_entry(tmp, &synths, node) { + if (tmp == in_synth) { + mutex_unlock(&spk_mutex); + return 0; + } + } + + if (in_synth->startup) + status = do_synth_init(in_synth); + + if (!status) + list_add_tail(&in_synth->node, &synths); + + mutex_unlock(&spk_mutex); + return status; +} +EXPORT_SYMBOL_GPL(synth_add); + +void synth_remove(struct spk_synth *in_synth) +{ + mutex_lock(&spk_mutex); + if (synth == in_synth) + synth_release(); + list_del(&in_synth->node); + module_status = 0; + mutex_unlock(&spk_mutex); +} +EXPORT_SYMBOL_GPL(synth_remove); + +struct spk_synth *synth_current(void) +{ + return synth; +} +EXPORT_SYMBOL_GPL(synth_current); + +short spk_punc_masks[] = { 0, SOME, MOST, PUNC, PUNC | B_SYM }; |