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318 lines
7.9 KiB
318 lines
7.9 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/interrupt.h> |
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#include <linux/ioport.h> |
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#include "spk_types.h" |
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#include "speakup.h" |
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#include "spk_priv.h" |
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#include "serialio.h" |
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#include <linux/serial_core.h> |
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/* WARNING: Do not change this to <linux/serial.h> without testing that |
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* SERIAL_PORT_DFNS does get defined to the appropriate value. |
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*/ |
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#include <asm/serial.h> |
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#ifndef SERIAL_PORT_DFNS |
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#define SERIAL_PORT_DFNS |
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#endif |
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static void start_serial_interrupt(int irq); |
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static const struct old_serial_port rs_table[] = { |
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SERIAL_PORT_DFNS |
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}; |
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static const struct old_serial_port *serstate; |
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static int timeouts; |
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static int spk_serial_out(struct spk_synth *in_synth, const char ch); |
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static void spk_serial_send_xchar(struct spk_synth *in_synth, char ch); |
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static void spk_serial_tiocmset(struct spk_synth *in_synth, unsigned int set, unsigned int clear); |
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static unsigned char spk_serial_in(struct spk_synth *in_synth); |
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static unsigned char spk_serial_in_nowait(struct spk_synth *in_synth); |
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static void spk_serial_flush_buffer(struct spk_synth *in_synth); |
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static int spk_serial_wait_for_xmitr(struct spk_synth *in_synth); |
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struct spk_io_ops spk_serial_io_ops = { |
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.synth_out = spk_serial_out, |
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.send_xchar = spk_serial_send_xchar, |
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.tiocmset = spk_serial_tiocmset, |
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.synth_in = spk_serial_in, |
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.synth_in_nowait = spk_serial_in_nowait, |
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.flush_buffer = spk_serial_flush_buffer, |
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.wait_for_xmitr = spk_serial_wait_for_xmitr, |
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}; |
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EXPORT_SYMBOL_GPL(spk_serial_io_ops); |
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const struct old_serial_port *spk_serial_init(int index) |
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{ |
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int baud = 9600, quot = 0; |
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unsigned int cval = 0; |
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int cflag = CREAD | HUPCL | CLOCAL | B9600 | CS8; |
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const struct old_serial_port *ser; |
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int err; |
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if (index >= ARRAY_SIZE(rs_table)) { |
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pr_info("no port info for ttyS%d\n", index); |
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return NULL; |
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} |
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ser = rs_table + index; |
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/* Divisor, bytesize and parity */ |
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quot = ser->baud_base / baud; |
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cval = cflag & (CSIZE | CSTOPB); |
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#if defined(__powerpc__) || defined(__alpha__) |
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cval >>= 8; |
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#else /* !__powerpc__ && !__alpha__ */ |
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cval >>= 4; |
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#endif /* !__powerpc__ && !__alpha__ */ |
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if (cflag & PARENB) |
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cval |= UART_LCR_PARITY; |
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if (!(cflag & PARODD)) |
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cval |= UART_LCR_EPAR; |
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if (synth_request_region(ser->port, 8)) { |
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/* try to take it back. */ |
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pr_info("Ports not available, trying to steal them\n"); |
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__release_region(&ioport_resource, ser->port, 8); |
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err = synth_request_region(ser->port, 8); |
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if (err) { |
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pr_warn("Unable to allocate port at %x, errno %i", |
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ser->port, err); |
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return NULL; |
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} |
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} |
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/* Disable UART interrupts, set DTR and RTS high |
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* and set speed. |
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*/ |
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outb(cval | UART_LCR_DLAB, ser->port + UART_LCR); /* set DLAB */ |
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outb(quot & 0xff, ser->port + UART_DLL); /* LS of divisor */ |
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outb(quot >> 8, ser->port + UART_DLM); /* MS of divisor */ |
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outb(cval, ser->port + UART_LCR); /* reset DLAB */ |
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/* Turn off Interrupts */ |
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outb(0, ser->port + UART_IER); |
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outb(UART_MCR_DTR | UART_MCR_RTS, ser->port + UART_MCR); |
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/* If we read 0xff from the LSR, there is no UART here. */ |
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if (inb(ser->port + UART_LSR) == 0xff) { |
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synth_release_region(ser->port, 8); |
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serstate = NULL; |
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return NULL; |
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} |
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mdelay(1); |
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speakup_info.port_tts = ser->port; |
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serstate = ser; |
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start_serial_interrupt(ser->irq); |
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return ser; |
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} |
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static irqreturn_t synth_readbuf_handler(int irq, void *dev_id) |
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{ |
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unsigned long flags; |
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int c; |
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spin_lock_irqsave(&speakup_info.spinlock, flags); |
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while (inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR) { |
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c = inb_p(speakup_info.port_tts + UART_RX); |
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synth->read_buff_add((u_char)c); |
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} |
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spin_unlock_irqrestore(&speakup_info.spinlock, flags); |
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return IRQ_HANDLED; |
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} |
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static void start_serial_interrupt(int irq) |
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{ |
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int rv; |
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if (!synth->read_buff_add) |
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return; |
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rv = request_irq(irq, synth_readbuf_handler, IRQF_SHARED, |
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"serial", (void *)synth_readbuf_handler); |
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if (rv) |
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pr_err("Unable to request Speakup serial I R Q\n"); |
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/* Set MCR */ |
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outb(UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2, |
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speakup_info.port_tts + UART_MCR); |
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/* Turn on Interrupts */ |
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outb(UART_IER_MSI | UART_IER_RLSI | UART_IER_RDI, |
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speakup_info.port_tts + UART_IER); |
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inb(speakup_info.port_tts + UART_LSR); |
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inb(speakup_info.port_tts + UART_RX); |
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inb(speakup_info.port_tts + UART_IIR); |
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inb(speakup_info.port_tts + UART_MSR); |
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outb(1, speakup_info.port_tts + UART_FCR); /* Turn FIFO On */ |
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} |
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static void spk_serial_send_xchar(struct spk_synth *synth, char ch) |
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{ |
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int timeout = SPK_XMITR_TIMEOUT; |
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while (spk_serial_tx_busy()) { |
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if (!--timeout) |
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break; |
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udelay(1); |
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} |
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outb(ch, speakup_info.port_tts); |
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} |
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static void spk_serial_tiocmset(struct spk_synth *in_synth, unsigned int set, unsigned int clear) |
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{ |
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int old = inb(speakup_info.port_tts + UART_MCR); |
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outb((old & ~clear) | set, speakup_info.port_tts + UART_MCR); |
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} |
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int spk_serial_synth_probe(struct spk_synth *synth) |
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{ |
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const struct old_serial_port *ser; |
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int failed = 0; |
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if ((synth->ser >= SPK_LO_TTY) && (synth->ser <= SPK_HI_TTY)) { |
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ser = spk_serial_init(synth->ser); |
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if (!ser) { |
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failed = -1; |
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} else { |
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outb_p(0, ser->port); |
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mdelay(1); |
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outb_p('\r', ser->port); |
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} |
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} else { |
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failed = -1; |
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pr_warn("ttyS%i is an invalid port\n", synth->ser); |
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} |
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if (failed) { |
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pr_info("%s: not found\n", synth->long_name); |
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return -ENODEV; |
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} |
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pr_info("%s: ttyS%i, Driver Version %s\n", |
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synth->long_name, synth->ser, synth->version); |
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synth->alive = 1; |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(spk_serial_synth_probe); |
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void spk_stop_serial_interrupt(void) |
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{ |
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if (speakup_info.port_tts == 0) |
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return; |
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if (!synth->read_buff_add) |
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return; |
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/* Turn off interrupts */ |
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outb(0, speakup_info.port_tts + UART_IER); |
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/* Free IRQ */ |
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free_irq(serstate->irq, (void *)synth_readbuf_handler); |
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} |
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EXPORT_SYMBOL_GPL(spk_stop_serial_interrupt); |
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static int spk_serial_wait_for_xmitr(struct spk_synth *in_synth) |
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{ |
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int tmout = SPK_XMITR_TIMEOUT; |
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if ((in_synth->alive) && (timeouts >= NUM_DISABLE_TIMEOUTS)) { |
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pr_warn("%s: too many timeouts, deactivating speakup\n", |
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in_synth->long_name); |
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in_synth->alive = 0; |
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/* No synth any more, so nobody will restart TTYs, and we thus |
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* need to do it ourselves. Now that there is no synth we can |
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* let application flood anyway |
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*/ |
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speakup_start_ttys(); |
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timeouts = 0; |
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return 0; |
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} |
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while (spk_serial_tx_busy()) { |
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if (--tmout == 0) { |
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pr_warn("%s: timed out (tx busy)\n", |
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in_synth->long_name); |
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timeouts++; |
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return 0; |
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} |
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udelay(1); |
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} |
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tmout = SPK_CTS_TIMEOUT; |
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while (!((inb_p(speakup_info.port_tts + UART_MSR)) & UART_MSR_CTS)) { |
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/* CTS */ |
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if (--tmout == 0) { |
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timeouts++; |
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return 0; |
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} |
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udelay(1); |
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} |
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timeouts = 0; |
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return 1; |
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} |
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static unsigned char spk_serial_in(struct spk_synth *in_synth) |
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{ |
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int tmout = SPK_SERIAL_TIMEOUT; |
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while (!(inb_p(speakup_info.port_tts + UART_LSR) & UART_LSR_DR)) { |
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if (--tmout == 0) { |
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pr_warn("time out while waiting for input.\n"); |
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return 0xff; |
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} |
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udelay(1); |
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} |
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return inb_p(speakup_info.port_tts + UART_RX); |
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} |
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static unsigned char spk_serial_in_nowait(struct spk_synth *in_synth) |
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{ |
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unsigned char lsr; |
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lsr = inb_p(speakup_info.port_tts + UART_LSR); |
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if (!(lsr & UART_LSR_DR)) |
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return 0; |
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return inb_p(speakup_info.port_tts + UART_RX); |
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} |
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static void spk_serial_flush_buffer(struct spk_synth *in_synth) |
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{ |
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/* TODO: flush the UART 16550 buffer */ |
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} |
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static int spk_serial_out(struct spk_synth *in_synth, const char ch) |
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{ |
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if (in_synth->alive && spk_serial_wait_for_xmitr(in_synth)) { |
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outb_p(ch, speakup_info.port_tts); |
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return 1; |
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} |
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return 0; |
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} |
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const char *spk_serial_synth_immediate(struct spk_synth *synth, |
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const char *buff) |
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{ |
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u_char ch; |
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while ((ch = *buff)) { |
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if (ch == '\n') |
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ch = synth->procspeech; |
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if (spk_serial_wait_for_xmitr(synth)) |
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outb(ch, speakup_info.port_tts); |
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else |
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return buff; |
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buff++; |
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} |
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return NULL; |
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} |
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EXPORT_SYMBOL_GPL(spk_serial_synth_immediate); |
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void spk_serial_release(struct spk_synth *synth) |
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{ |
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spk_stop_serial_interrupt(); |
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if (speakup_info.port_tts == 0) |
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return; |
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synth_release_region(speakup_info.port_tts, 8); |
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speakup_info.port_tts = 0; |
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} |
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EXPORT_SYMBOL_GPL(spk_serial_release);
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