diff options
Diffstat (limited to 'ANDROID_3.4.5/sound/drivers/serial-u16550.c')
| -rw-r--r-- | ANDROID_3.4.5/sound/drivers/serial-u16550.c | 1050 |
1 files changed, 0 insertions, 1050 deletions
diff --git a/ANDROID_3.4.5/sound/drivers/serial-u16550.c b/ANDROID_3.4.5/sound/drivers/serial-u16550.c deleted file mode 100644 index b2d0e8e4..00000000 --- a/ANDROID_3.4.5/sound/drivers/serial-u16550.c +++ /dev/null @@ -1,1050 +0,0 @@ -/* - * serial.c - * Copyright (c) by Jaroslav Kysela <perex@perex.cz>, - * Isaku Yamahata <yamahata@private.email.ne.jp>, - * George Hansper <ghansper@apana.org.au>, - * Hannu Savolainen - * - * This code is based on the code from ALSA 0.5.9, but heavily rewritten. - * - * 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. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA - * - * Sat Mar 31 17:27:57 PST 2001 tim.mann@compaq.com - * Added support for the Midiator MS-124T and for the MS-124W in - * Single Addressed (S/A) or Multiple Burst (M/B) mode, with - * power derived either parasitically from the serial port or - * from a separate power supply. - * - * More documentation can be found in serial-u16550.txt. - */ - -#include <linux/init.h> -#include <linux/interrupt.h> -#include <linux/err.h> -#include <linux/platform_device.h> -#include <linux/slab.h> -#include <linux/ioport.h> -#include <linux/module.h> -#include <sound/core.h> -#include <sound/rawmidi.h> -#include <sound/initval.h> - -#include <linux/serial_reg.h> -#include <linux/jiffies.h> - -#include <asm/io.h> - -MODULE_DESCRIPTION("MIDI serial u16550"); -MODULE_LICENSE("GPL"); -MODULE_SUPPORTED_DEVICE("{{ALSA, MIDI serial u16550}}"); - -#define SNDRV_SERIAL_SOUNDCANVAS 0 /* Roland Soundcanvas; F5 NN selects part */ -#define SNDRV_SERIAL_MS124T 1 /* Midiator MS-124T */ -#define SNDRV_SERIAL_MS124W_SA 2 /* Midiator MS-124W in S/A mode */ -#define SNDRV_SERIAL_MS124W_MB 3 /* Midiator MS-124W in M/B mode */ -#define SNDRV_SERIAL_GENERIC 4 /* Generic Interface */ -#define SNDRV_SERIAL_MAX_ADAPTOR SNDRV_SERIAL_GENERIC -static char *adaptor_names[] = { - "Soundcanvas", - "MS-124T", - "MS-124W S/A", - "MS-124W M/B", - "Generic" -}; - -#define SNDRV_SERIAL_NORMALBUFF 0 /* Normal blocking buffer operation */ -#define SNDRV_SERIAL_DROPBUFF 1 /* Non-blocking discard operation */ - -static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */ -static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ -static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; /* Enable this card */ -static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT; /* 0x3f8,0x2f8,0x3e8,0x2e8 */ -static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ; /* 3,4,5,7,9,10,11,14,15 */ -static int speed[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 38400}; /* 9600,19200,38400,57600,115200 */ -static int base[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 115200}; /* baud base */ -static int outs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */ -static int ins[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */ -static int adaptor[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = SNDRV_SERIAL_SOUNDCANVAS}; -static bool droponfull[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS -1)] = SNDRV_SERIAL_NORMALBUFF }; - -module_param_array(index, int, NULL, 0444); -MODULE_PARM_DESC(index, "Index value for Serial MIDI."); -module_param_array(id, charp, NULL, 0444); -MODULE_PARM_DESC(id, "ID string for Serial MIDI."); -module_param_array(enable, bool, NULL, 0444); -MODULE_PARM_DESC(enable, "Enable UART16550A chip."); -module_param_array(port, long, NULL, 0444); -MODULE_PARM_DESC(port, "Port # for UART16550A chip."); -module_param_array(irq, int, NULL, 0444); -MODULE_PARM_DESC(irq, "IRQ # for UART16550A chip."); -module_param_array(speed, int, NULL, 0444); -MODULE_PARM_DESC(speed, "Speed in bauds."); -module_param_array(base, int, NULL, 0444); -MODULE_PARM_DESC(base, "Base for divisor in bauds."); -module_param_array(outs, int, NULL, 0444); -MODULE_PARM_DESC(outs, "Number of MIDI outputs."); -module_param_array(ins, int, NULL, 0444); -MODULE_PARM_DESC(ins, "Number of MIDI inputs."); -module_param_array(droponfull, bool, NULL, 0444); -MODULE_PARM_DESC(droponfull, "Flag to enable drop-on-full buffer mode"); - -module_param_array(adaptor, int, NULL, 0444); -MODULE_PARM_DESC(adaptor, "Type of adaptor."); - -/*#define SNDRV_SERIAL_MS124W_MB_NOCOMBO 1*/ /* Address outs as 0-3 instead of bitmap */ - -#define SNDRV_SERIAL_MAX_OUTS 16 /* max 64, min 16 */ -#define SNDRV_SERIAL_MAX_INS 16 /* max 64, min 16 */ - -#define TX_BUFF_SIZE (1<<15) /* Must be 2^n */ -#define TX_BUFF_MASK (TX_BUFF_SIZE - 1) - -#define SERIAL_MODE_NOT_OPENED (0) -#define SERIAL_MODE_INPUT_OPEN (1 << 0) -#define SERIAL_MODE_OUTPUT_OPEN (1 << 1) -#define SERIAL_MODE_INPUT_TRIGGERED (1 << 2) -#define SERIAL_MODE_OUTPUT_TRIGGERED (1 << 3) - -struct snd_uart16550 { - struct snd_card *card; - struct snd_rawmidi *rmidi; - struct snd_rawmidi_substream *midi_output[SNDRV_SERIAL_MAX_OUTS]; - struct snd_rawmidi_substream *midi_input[SNDRV_SERIAL_MAX_INS]; - - int filemode; /* open status of file */ - - spinlock_t open_lock; - - int irq; - - unsigned long base; - struct resource *res_base; - - unsigned int speed; - unsigned int speed_base; - unsigned char divisor; - - unsigned char old_divisor_lsb; - unsigned char old_divisor_msb; - unsigned char old_line_ctrl_reg; - - /* parameter for using of write loop */ - short int fifo_limit; /* used in uart16550 */ - short int fifo_count; /* used in uart16550 */ - - /* type of adaptor */ - int adaptor; - - /* inputs */ - int prev_in; - unsigned char rstatus; - - /* outputs */ - int prev_out; - unsigned char prev_status[SNDRV_SERIAL_MAX_OUTS]; - - /* write buffer and its writing/reading position */ - unsigned char tx_buff[TX_BUFF_SIZE]; - int buff_in_count; - int buff_in; - int buff_out; - int drop_on_full; - - /* wait timer */ - unsigned int timer_running:1; - struct timer_list buffer_timer; - -}; - -static struct platform_device *devices[SNDRV_CARDS]; - -static inline void snd_uart16550_add_timer(struct snd_uart16550 *uart) -{ - if (!uart->timer_running) { - /* timer 38600bps * 10bit * 16byte */ - uart->buffer_timer.expires = jiffies + (HZ+255)/256; - uart->timer_running = 1; - add_timer(&uart->buffer_timer); - } -} - -static inline void snd_uart16550_del_timer(struct snd_uart16550 *uart) -{ - if (uart->timer_running) { - del_timer(&uart->buffer_timer); - uart->timer_running = 0; - } -} - -/* This macro is only used in snd_uart16550_io_loop */ -static inline void snd_uart16550_buffer_output(struct snd_uart16550 *uart) -{ - unsigned short buff_out = uart->buff_out; - if (uart->buff_in_count > 0) { - outb(uart->tx_buff[buff_out], uart->base + UART_TX); - uart->fifo_count++; - buff_out++; - buff_out &= TX_BUFF_MASK; - uart->buff_out = buff_out; - uart->buff_in_count--; - } -} - -/* This loop should be called with interrupts disabled - * We don't want to interrupt this, - * as we're already handling an interrupt - */ -static void snd_uart16550_io_loop(struct snd_uart16550 * uart) -{ - unsigned char c, status; - int substream; - - /* recall previous stream */ - substream = uart->prev_in; - - /* Read Loop */ - while ((status = inb(uart->base + UART_LSR)) & UART_LSR_DR) { - /* while receive data ready */ - c = inb(uart->base + UART_RX); - - /* keep track of last status byte */ - if (c & 0x80) - uart->rstatus = c; - - /* handle stream switch */ - if (uart->adaptor == SNDRV_SERIAL_GENERIC) { - if (uart->rstatus == 0xf5) { - if (c <= SNDRV_SERIAL_MAX_INS && c > 0) - substream = c - 1; - if (c != 0xf5) - /* prevent future bytes from being - interpreted as streams */ - uart->rstatus = 0; - } else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) - && uart->midi_input[substream]) - snd_rawmidi_receive(uart->midi_input[substream], - &c, 1); - } else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) && - uart->midi_input[substream]) - snd_rawmidi_receive(uart->midi_input[substream], &c, 1); - - if (status & UART_LSR_OE) - snd_printk(KERN_WARNING - "%s: Overrun on device at 0x%lx\n", - uart->rmidi->name, uart->base); - } - - /* remember the last stream */ - uart->prev_in = substream; - - /* no need of check SERIAL_MODE_OUTPUT_OPEN because if not, - buffer is never filled. */ - /* Check write status */ - if (status & UART_LSR_THRE) - uart->fifo_count = 0; - if (uart->adaptor == SNDRV_SERIAL_MS124W_SA - || uart->adaptor == SNDRV_SERIAL_GENERIC) { - /* Can't use FIFO, must send only when CTS is true */ - status = inb(uart->base + UART_MSR); - while (uart->fifo_count == 0 && (status & UART_MSR_CTS) && - uart->buff_in_count > 0) { - snd_uart16550_buffer_output(uart); - status = inb(uart->base + UART_MSR); - } - } else { - /* Write loop */ - while (uart->fifo_count < uart->fifo_limit /* Can we write ? */ - && uart->buff_in_count > 0) /* Do we want to? */ - snd_uart16550_buffer_output(uart); - } - if (uart->irq < 0 && uart->buff_in_count > 0) - snd_uart16550_add_timer(uart); -} - -/* NOTES ON SERVICING INTERUPTS - * --------------------------- - * After receiving a interrupt, it is important to indicate to the UART that - * this has been done. - * For a Rx interrupt, this is done by reading the received byte. - * For a Tx interrupt this is done by either: - * a) Writing a byte - * b) Reading the IIR - * It is particularly important to read the IIR if a Tx interrupt is received - * when there is no data in tx_buff[], as in this case there no other - * indication that the interrupt has been serviced, and it remains outstanding - * indefinitely. This has the curious side effect that and no further interrupts - * will be generated from this device AT ALL!!. - * It is also desirable to clear outstanding interrupts when the device is - * opened/closed. - * - * - * Note that some devices need OUT2 to be set before they will generate - * interrupts at all. (Possibly tied to an internal pull-up on CTS?) - */ -static irqreturn_t snd_uart16550_interrupt(int irq, void *dev_id) -{ - struct snd_uart16550 *uart; - - uart = dev_id; - spin_lock(&uart->open_lock); - if (uart->filemode == SERIAL_MODE_NOT_OPENED) { - spin_unlock(&uart->open_lock); - return IRQ_NONE; - } - /* indicate to the UART that the interrupt has been serviced */ - inb(uart->base + UART_IIR); - snd_uart16550_io_loop(uart); - spin_unlock(&uart->open_lock); - return IRQ_HANDLED; -} - -/* When the polling mode, this function calls snd_uart16550_io_loop. */ -static void snd_uart16550_buffer_timer(unsigned long data) -{ - unsigned long flags; - struct snd_uart16550 *uart; - - uart = (struct snd_uart16550 *)data; - spin_lock_irqsave(&uart->open_lock, flags); - snd_uart16550_del_timer(uart); - snd_uart16550_io_loop(uart); - spin_unlock_irqrestore(&uart->open_lock, flags); -} - -/* - * this method probes, if an uart sits on given port - * return 0 if found - * return negative error if not found - */ -static int __devinit snd_uart16550_detect(struct snd_uart16550 *uart) -{ - unsigned long io_base = uart->base; - int ok; - unsigned char c; - - /* Do some vague tests for the presence of the uart */ - if (io_base == 0 || io_base == SNDRV_AUTO_PORT) { - return -ENODEV; /* Not configured */ - } - - uart->res_base = request_region(io_base, 8, "Serial MIDI"); - if (uart->res_base == NULL) { - snd_printk(KERN_ERR "u16550: can't grab port 0x%lx\n", io_base); - return -EBUSY; - } - - /* uart detected unless one of the following tests should fail */ - ok = 1; - /* 8 data-bits, 1 stop-bit, parity off, DLAB = 0 */ - outb(UART_LCR_WLEN8, io_base + UART_LCR); /* Line Control Register */ - c = inb(io_base + UART_IER); - /* The top four bits of the IER should always == 0 */ - if ((c & 0xf0) != 0) - ok = 0; /* failed */ - - outb(0xaa, io_base + UART_SCR); - /* Write arbitrary data into the scratch reg */ - c = inb(io_base + UART_SCR); - /* If it comes back, it's OK */ - if (c != 0xaa) - ok = 0; /* failed */ - - outb(0x55, io_base + UART_SCR); - /* Write arbitrary data into the scratch reg */ - c = inb(io_base + UART_SCR); - /* If it comes back, it's OK */ - if (c != 0x55) - ok = 0; /* failed */ - - return ok; -} - -static void snd_uart16550_do_open(struct snd_uart16550 * uart) -{ - char byte; - - /* Initialize basic variables */ - uart->buff_in_count = 0; - uart->buff_in = 0; - uart->buff_out = 0; - uart->fifo_limit = 1; - uart->fifo_count = 0; - uart->timer_running = 0; - - outb(UART_FCR_ENABLE_FIFO /* Enable FIFO's (if available) */ - | UART_FCR_CLEAR_RCVR /* Clear receiver FIFO */ - | UART_FCR_CLEAR_XMIT /* Clear transmitter FIFO */ - | UART_FCR_TRIGGER_4 /* Set FIFO trigger at 4-bytes */ - /* NOTE: interrupt generated after T=(time)4-bytes - * if less than UART_FCR_TRIGGER bytes received - */ - ,uart->base + UART_FCR); /* FIFO Control Register */ - - if ((inb(uart->base + UART_IIR) & 0xf0) == 0xc0) - uart->fifo_limit = 16; - if (uart->divisor != 0) { - uart->old_line_ctrl_reg = inb(uart->base + UART_LCR); - outb(UART_LCR_DLAB /* Divisor latch access bit */ - ,uart->base + UART_LCR); /* Line Control Register */ - uart->old_divisor_lsb = inb(uart->base + UART_DLL); - uart->old_divisor_msb = inb(uart->base + UART_DLM); - - outb(uart->divisor - ,uart->base + UART_DLL); /* Divisor Latch Low */ - outb(0 - ,uart->base + UART_DLM); /* Divisor Latch High */ - /* DLAB is reset to 0 in next outb() */ - } - /* Set serial parameters (parity off, etc) */ - outb(UART_LCR_WLEN8 /* 8 data-bits */ - | 0 /* 1 stop-bit */ - | 0 /* parity off */ - | 0 /* DLAB = 0 */ - ,uart->base + UART_LCR); /* Line Control Register */ - - switch (uart->adaptor) { - default: - outb(UART_MCR_RTS /* Set Request-To-Send line active */ - | UART_MCR_DTR /* Set Data-Terminal-Ready line active */ - | UART_MCR_OUT2 /* Set OUT2 - not always required, but when - * it is, it is ESSENTIAL for enabling interrupts - */ - ,uart->base + UART_MCR); /* Modem Control Register */ - break; - case SNDRV_SERIAL_MS124W_SA: - case SNDRV_SERIAL_MS124W_MB: - /* MS-124W can draw power from RTS and DTR if they - are in opposite states. */ - outb(UART_MCR_RTS | (0&UART_MCR_DTR) | UART_MCR_OUT2, - uart->base + UART_MCR); - break; - case SNDRV_SERIAL_MS124T: - /* MS-124T can draw power from RTS and/or DTR (preferably - both) if they are both asserted. */ - outb(UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2, - uart->base + UART_MCR); - break; - } - - if (uart->irq < 0) { - byte = (0 & UART_IER_RDI) /* Disable Receiver data interrupt */ - |(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */ - ; - } else if (uart->adaptor == SNDRV_SERIAL_MS124W_SA) { - byte = UART_IER_RDI /* Enable Receiver data interrupt */ - | UART_IER_MSI /* Enable Modem status interrupt */ - ; - } else if (uart->adaptor == SNDRV_SERIAL_GENERIC) { - byte = UART_IER_RDI /* Enable Receiver data interrupt */ - | UART_IER_MSI /* Enable Modem status interrupt */ - | UART_IER_THRI /* Enable Transmitter holding register empty interrupt */ - ; - } else { - byte = UART_IER_RDI /* Enable Receiver data interrupt */ - | UART_IER_THRI /* Enable Transmitter holding register empty interrupt */ - ; - } - outb(byte, uart->base + UART_IER); /* Interrupt enable Register */ - - inb(uart->base + UART_LSR); /* Clear any pre-existing overrun indication */ - inb(uart->base + UART_IIR); /* Clear any pre-existing transmit interrupt */ - inb(uart->base + UART_RX); /* Clear any pre-existing receive interrupt */ -} - -static void snd_uart16550_do_close(struct snd_uart16550 * uart) -{ - if (uart->irq < 0) - snd_uart16550_del_timer(uart); - - /* NOTE: may need to disable interrupts before de-registering out handler. - * For now, the consequences are harmless. - */ - - outb((0 & UART_IER_RDI) /* Disable Receiver data interrupt */ - |(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */ - ,uart->base + UART_IER); /* Interrupt enable Register */ - - switch (uart->adaptor) { - default: - outb((0 & UART_MCR_RTS) /* Deactivate Request-To-Send line */ - |(0 & UART_MCR_DTR) /* Deactivate Data-Terminal-Ready line */ - |(0 & UART_MCR_OUT2) /* Deactivate OUT2 */ - ,uart->base + UART_MCR); /* Modem Control Register */ - break; - case SNDRV_SERIAL_MS124W_SA: - case SNDRV_SERIAL_MS124W_MB: - /* MS-124W can draw power from RTS and DTR if they - are in opposite states; leave it powered. */ - outb(UART_MCR_RTS | (0&UART_MCR_DTR) | (0&UART_MCR_OUT2), - uart->base + UART_MCR); - break; - case SNDRV_SERIAL_MS124T: - /* MS-124T can draw power from RTS and/or DTR (preferably - both) if they are both asserted; leave it powered. */ - outb(UART_MCR_RTS | UART_MCR_DTR | (0&UART_MCR_OUT2), - uart->base + UART_MCR); - break; - } - - inb(uart->base + UART_IIR); /* Clear any outstanding interrupts */ - - /* Restore old divisor */ - if (uart->divisor != 0) { - outb(UART_LCR_DLAB /* Divisor latch access bit */ - ,uart->base + UART_LCR); /* Line Control Register */ - outb(uart->old_divisor_lsb - ,uart->base + UART_DLL); /* Divisor Latch Low */ - outb(uart->old_divisor_msb - ,uart->base + UART_DLM); /* Divisor Latch High */ - /* Restore old LCR (data bits, stop bits, parity, DLAB) */ - outb(uart->old_line_ctrl_reg - ,uart->base + UART_LCR); /* Line Control Register */ - } -} - -static int snd_uart16550_input_open(struct snd_rawmidi_substream *substream) -{ - unsigned long flags; - struct snd_uart16550 *uart = substream->rmidi->private_data; - - spin_lock_irqsave(&uart->open_lock, flags); - if (uart->filemode == SERIAL_MODE_NOT_OPENED) - snd_uart16550_do_open(uart); - uart->filemode |= SERIAL_MODE_INPUT_OPEN; - uart->midi_input[substream->number] = substream; - spin_unlock_irqrestore(&uart->open_lock, flags); - return 0; -} - -static int snd_uart16550_input_close(struct snd_rawmidi_substream *substream) -{ - unsigned long flags; - struct snd_uart16550 *uart = substream->rmidi->private_data; - - spin_lock_irqsave(&uart->open_lock, flags); - uart->filemode &= ~SERIAL_MODE_INPUT_OPEN; - uart->midi_input[substream->number] = NULL; - if (uart->filemode == SERIAL_MODE_NOT_OPENED) - snd_uart16550_do_close(uart); - spin_unlock_irqrestore(&uart->open_lock, flags); - return 0; -} - -static void snd_uart16550_input_trigger(struct snd_rawmidi_substream *substream, - int up) -{ - unsigned long flags; - struct snd_uart16550 *uart = substream->rmidi->private_data; - - spin_lock_irqsave(&uart->open_lock, flags); - if (up) - uart->filemode |= SERIAL_MODE_INPUT_TRIGGERED; - else - uart->filemode &= ~SERIAL_MODE_INPUT_TRIGGERED; - spin_unlock_irqrestore(&uart->open_lock, flags); -} - -static int snd_uart16550_output_open(struct snd_rawmidi_substream *substream) -{ - unsigned long flags; - struct snd_uart16550 *uart = substream->rmidi->private_data; - - spin_lock_irqsave(&uart->open_lock, flags); - if (uart->filemode == SERIAL_MODE_NOT_OPENED) - snd_uart16550_do_open(uart); - uart->filemode |= SERIAL_MODE_OUTPUT_OPEN; - uart->midi_output[substream->number] = substream; - spin_unlock_irqrestore(&uart->open_lock, flags); - return 0; -}; - -static int snd_uart16550_output_close(struct snd_rawmidi_substream *substream) -{ - unsigned long flags; - struct snd_uart16550 *uart = substream->rmidi->private_data; - - spin_lock_irqsave(&uart->open_lock, flags); - uart->filemode &= ~SERIAL_MODE_OUTPUT_OPEN; - uart->midi_output[substream->number] = NULL; - if (uart->filemode == SERIAL_MODE_NOT_OPENED) - snd_uart16550_do_close(uart); - spin_unlock_irqrestore(&uart->open_lock, flags); - return 0; -}; - -static inline int snd_uart16550_buffer_can_write(struct snd_uart16550 *uart, - int Num) -{ - if (uart->buff_in_count + Num < TX_BUFF_SIZE) - return 1; - else - return 0; -} - -static inline int snd_uart16550_write_buffer(struct snd_uart16550 *uart, - unsigned char byte) -{ - unsigned short buff_in = uart->buff_in; - if (uart->buff_in_count < TX_BUFF_SIZE) { - uart->tx_buff[buff_in] = byte; - buff_in++; - buff_in &= TX_BUFF_MASK; - uart->buff_in = buff_in; - uart->buff_in_count++; - if (uart->irq < 0) /* polling mode */ - snd_uart16550_add_timer(uart); - return 1; - } else - return 0; -} - -static int snd_uart16550_output_byte(struct snd_uart16550 *uart, - struct snd_rawmidi_substream *substream, - unsigned char midi_byte) -{ - if (uart->buff_in_count == 0 /* Buffer empty? */ - && ((uart->adaptor != SNDRV_SERIAL_MS124W_SA && - uart->adaptor != SNDRV_SERIAL_GENERIC) || - (uart->fifo_count == 0 /* FIFO empty? */ - && (inb(uart->base + UART_MSR) & UART_MSR_CTS)))) { /* CTS? */ - - /* Tx Buffer Empty - try to write immediately */ - if ((inb(uart->base + UART_LSR) & UART_LSR_THRE) != 0) { - /* Transmitter holding register (and Tx FIFO) empty */ - uart->fifo_count = 1; - outb(midi_byte, uart->base + UART_TX); - } else { - if (uart->fifo_count < uart->fifo_limit) { - uart->fifo_count++; - outb(midi_byte, uart->base + UART_TX); - } else { - /* Cannot write (buffer empty) - - * put char in buffer */ - snd_uart16550_write_buffer(uart, midi_byte); - } - } - } else { - if (!snd_uart16550_write_buffer(uart, midi_byte)) { - snd_printk(KERN_WARNING - "%s: Buffer overrun on device at 0x%lx\n", - uart->rmidi->name, uart->base); - return 0; - } - } - - return 1; -} - -static void snd_uart16550_output_write(struct snd_rawmidi_substream *substream) -{ - unsigned long flags; - unsigned char midi_byte, addr_byte; - struct snd_uart16550 *uart = substream->rmidi->private_data; - char first; - static unsigned long lasttime = 0; - - /* Interrupts are disabled during the updating of the tx_buff, - * since it is 'bad' to have two processes updating the same - * variables (ie buff_in & buff_out) - */ - - spin_lock_irqsave(&uart->open_lock, flags); - - if (uart->irq < 0) /* polling */ - snd_uart16550_io_loop(uart); - - if (uart->adaptor == SNDRV_SERIAL_MS124W_MB) { - while (1) { - /* buffer full? */ - /* in this mode we need two bytes of space */ - if (uart->buff_in_count > TX_BUFF_SIZE - 2) - break; - if (snd_rawmidi_transmit(substream, &midi_byte, 1) != 1) - break; -#ifdef SNDRV_SERIAL_MS124W_MB_NOCOMBO - /* select exactly one of the four ports */ - addr_byte = (1 << (substream->number + 4)) | 0x08; -#else - /* select any combination of the four ports */ - addr_byte = (substream->number << 4) | 0x08; - /* ...except none */ - if (addr_byte == 0x08) - addr_byte = 0xf8; -#endif - snd_uart16550_output_byte(uart, substream, addr_byte); - /* send midi byte */ - snd_uart16550_output_byte(uart, substream, midi_byte); - } - } else { - first = 0; - while (snd_rawmidi_transmit_peek(substream, &midi_byte, 1) == 1) { - /* Also send F5 after 3 seconds with no data - * to handle device disconnect */ - if (first == 0 && - (uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS || - uart->adaptor == SNDRV_SERIAL_GENERIC) && - (uart->prev_out != substream->number || - time_after(jiffies, lasttime + 3*HZ))) { - - if (snd_uart16550_buffer_can_write(uart, 3)) { - /* Roland Soundcanvas part selection */ - /* If this substream of the data is - * different previous substream - * in this uart, send the change part - * event - */ - uart->prev_out = substream->number; - /* change part */ - snd_uart16550_output_byte(uart, substream, - 0xf5); - /* data */ - snd_uart16550_output_byte(uart, substream, - uart->prev_out + 1); - /* If midi_byte is a data byte, - * send the previous status byte */ - if (midi_byte < 0x80 && - uart->adaptor == SNDRV_SERIAL_SOUNDCANVAS) - snd_uart16550_output_byte(uart, substream, uart->prev_status[uart->prev_out]); - } else if (!uart->drop_on_full) - break; - - } - - /* send midi byte */ - if (!snd_uart16550_output_byte(uart, substream, midi_byte) && - !uart->drop_on_full ) - break; - - if (midi_byte >= 0x80 && midi_byte < 0xf0) - uart->prev_status[uart->prev_out] = midi_byte; - first = 1; - - snd_rawmidi_transmit_ack( substream, 1 ); - } - lasttime = jiffies; - } - spin_unlock_irqrestore(&uart->open_lock, flags); -} - -static void snd_uart16550_output_trigger(struct snd_rawmidi_substream *substream, - int up) -{ - unsigned long flags; - struct snd_uart16550 *uart = substream->rmidi->private_data; - - spin_lock_irqsave(&uart->open_lock, flags); - if (up) - uart->filemode |= SERIAL_MODE_OUTPUT_TRIGGERED; - else - uart->filemode &= ~SERIAL_MODE_OUTPUT_TRIGGERED; - spin_unlock_irqrestore(&uart->open_lock, flags); - if (up) - snd_uart16550_output_write(substream); -} - -static struct snd_rawmidi_ops snd_uart16550_output = -{ - .open = snd_uart16550_output_open, - .close = snd_uart16550_output_close, - .trigger = snd_uart16550_output_trigger, -}; - -static struct snd_rawmidi_ops snd_uart16550_input = -{ - .open = snd_uart16550_input_open, - .close = snd_uart16550_input_close, - .trigger = snd_uart16550_input_trigger, -}; - -static int snd_uart16550_free(struct snd_uart16550 *uart) -{ - if (uart->irq >= 0) - free_irq(uart->irq, uart); - release_and_free_resource(uart->res_base); - kfree(uart); - return 0; -}; - -static int snd_uart16550_dev_free(struct snd_device *device) -{ - struct snd_uart16550 *uart = device->device_data; - return snd_uart16550_free(uart); -} - -static int __devinit snd_uart16550_create(struct snd_card *card, - unsigned long iobase, - int irq, - unsigned int speed, - unsigned int base, - int adaptor, - int droponfull, - struct snd_uart16550 **ruart) -{ - static struct snd_device_ops ops = { - .dev_free = snd_uart16550_dev_free, - }; - struct snd_uart16550 *uart; - int err; - - - if ((uart = kzalloc(sizeof(*uart), GFP_KERNEL)) == NULL) - return -ENOMEM; - uart->adaptor = adaptor; - uart->card = card; - spin_lock_init(&uart->open_lock); - uart->irq = -1; - uart->base = iobase; - uart->drop_on_full = droponfull; - - if ((err = snd_uart16550_detect(uart)) <= 0) { - printk(KERN_ERR "no UART detected at 0x%lx\n", iobase); - snd_uart16550_free(uart); - return -ENODEV; - } - - if (irq >= 0 && irq != SNDRV_AUTO_IRQ) { - if (request_irq(irq, snd_uart16550_interrupt, - 0, "Serial MIDI", uart)) { - snd_printk(KERN_WARNING - "irq %d busy. Using Polling.\n", irq); - } else { - uart->irq = irq; - } - } - uart->divisor = base / speed; - uart->speed = base / (unsigned int)uart->divisor; - uart->speed_base = base; - uart->prev_out = -1; - uart->prev_in = 0; - uart->rstatus = 0; - memset(uart->prev_status, 0x80, sizeof(unsigned char) * SNDRV_SERIAL_MAX_OUTS); - init_timer(&uart->buffer_timer); - uart->buffer_timer.function = snd_uart16550_buffer_timer; - uart->buffer_timer.data = (unsigned long)uart; - uart->timer_running = 0; - - /* Register device */ - if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, uart, &ops)) < 0) { - snd_uart16550_free(uart); - return err; - } - - switch (uart->adaptor) { - case SNDRV_SERIAL_MS124W_SA: - case SNDRV_SERIAL_MS124W_MB: - /* MS-124W can draw power from RTS and DTR if they - are in opposite states. */ - outb(UART_MCR_RTS | (0&UART_MCR_DTR), uart->base + UART_MCR); - break; - case SNDRV_SERIAL_MS124T: - /* MS-124T can draw power from RTS and/or DTR (preferably - both) if they are asserted. */ - outb(UART_MCR_RTS | UART_MCR_DTR, uart->base + UART_MCR); - break; - default: - break; - } - - if (ruart) - *ruart = uart; - - return 0; -} - -static void __devinit snd_uart16550_substreams(struct snd_rawmidi_str *stream) -{ - struct snd_rawmidi_substream *substream; - - list_for_each_entry(substream, &stream->substreams, list) { - sprintf(substream->name, "Serial MIDI %d", substream->number + 1); - } -} - -static int __devinit snd_uart16550_rmidi(struct snd_uart16550 *uart, int device, - int outs, int ins, - struct snd_rawmidi **rmidi) -{ - struct snd_rawmidi *rrawmidi; - int err; - - err = snd_rawmidi_new(uart->card, "UART Serial MIDI", device, - outs, ins, &rrawmidi); - if (err < 0) - return err; - snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_INPUT, - &snd_uart16550_input); - snd_rawmidi_set_ops(rrawmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, - &snd_uart16550_output); - strcpy(rrawmidi->name, "Serial MIDI"); - snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_OUTPUT]); - snd_uart16550_substreams(&rrawmidi->streams[SNDRV_RAWMIDI_STREAM_INPUT]); - rrawmidi->info_flags = SNDRV_RAWMIDI_INFO_OUTPUT | - SNDRV_RAWMIDI_INFO_INPUT | - SNDRV_RAWMIDI_INFO_DUPLEX; - rrawmidi->private_data = uart; - if (rmidi) - *rmidi = rrawmidi; - return 0; -} - -static int __devinit snd_serial_probe(struct platform_device *devptr) -{ - struct snd_card *card; - struct snd_uart16550 *uart; - int err; - int dev = devptr->id; - - switch (adaptor[dev]) { - case SNDRV_SERIAL_SOUNDCANVAS: - ins[dev] = 1; - break; - case SNDRV_SERIAL_MS124T: - case SNDRV_SERIAL_MS124W_SA: - outs[dev] = 1; - ins[dev] = 1; - break; - case SNDRV_SERIAL_MS124W_MB: - outs[dev] = 16; - ins[dev] = 1; - break; - case SNDRV_SERIAL_GENERIC: - break; - default: - snd_printk(KERN_ERR - "Adaptor type is out of range 0-%d (%d)\n", - SNDRV_SERIAL_MAX_ADAPTOR, adaptor[dev]); - return -ENODEV; - } - - if (outs[dev] < 1 || outs[dev] > SNDRV_SERIAL_MAX_OUTS) { - snd_printk(KERN_ERR - "Count of outputs is out of range 1-%d (%d)\n", - SNDRV_SERIAL_MAX_OUTS, outs[dev]); - return -ENODEV; - } - - if (ins[dev] < 1 || ins[dev] > SNDRV_SERIAL_MAX_INS) { - snd_printk(KERN_ERR - "Count of inputs is out of range 1-%d (%d)\n", - SNDRV_SERIAL_MAX_INS, ins[dev]); - return -ENODEV; - } - - err = snd_card_create(index[dev], id[dev], THIS_MODULE, 0, &card); - if (err < 0) - return err; - - strcpy(card->driver, "Serial"); - strcpy(card->shortname, "Serial MIDI (UART16550A)"); - - if ((err = snd_uart16550_create(card, - port[dev], - irq[dev], - speed[dev], - base[dev], - adaptor[dev], - droponfull[dev], - &uart)) < 0) - goto _err; - - err = snd_uart16550_rmidi(uart, 0, outs[dev], ins[dev], &uart->rmidi); - if (err < 0) - goto _err; - - sprintf(card->longname, "%s [%s] at %#lx, irq %d", - card->shortname, - adaptor_names[uart->adaptor], - uart->base, - uart->irq); - - snd_card_set_dev(card, &devptr->dev); - - if ((err = snd_card_register(card)) < 0) - goto _err; - - platform_set_drvdata(devptr, card); - return 0; - - _err: - snd_card_free(card); - return err; -} - -static int __devexit snd_serial_remove(struct platform_device *devptr) -{ - snd_card_free(platform_get_drvdata(devptr)); - platform_set_drvdata(devptr, NULL); - return 0; -} - -#define SND_SERIAL_DRIVER "snd_serial_u16550" - -static struct platform_driver snd_serial_driver = { - .probe = snd_serial_probe, - .remove = __devexit_p( snd_serial_remove), - .driver = { - .name = SND_SERIAL_DRIVER - }, -}; - -static void snd_serial_unregister_all(void) -{ - int i; - - for (i = 0; i < ARRAY_SIZE(devices); ++i) - platform_device_unregister(devices[i]); - platform_driver_unregister(&snd_serial_driver); -} - -static int __init alsa_card_serial_init(void) -{ - int i, cards, err; - - if ((err = platform_driver_register(&snd_serial_driver)) < 0) - return err; - - cards = 0; - for (i = 0; i < SNDRV_CARDS; i++) { - struct platform_device *device; - if (! enable[i]) - continue; - device = platform_device_register_simple(SND_SERIAL_DRIVER, - i, NULL, 0); - if (IS_ERR(device)) - continue; - if (!platform_get_drvdata(device)) { - platform_device_unregister(device); - continue; - } - devices[i] = device; - cards++; - } - if (! cards) { -#ifdef MODULE - printk(KERN_ERR "serial midi soundcard not found or device busy\n"); -#endif - snd_serial_unregister_all(); - return -ENODEV; - } - return 0; -} - -static void __exit alsa_card_serial_exit(void) -{ - snd_serial_unregister_all(); -} - -module_init(alsa_card_serial_init) -module_exit(alsa_card_serial_exit) |