/* * 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 <linux/io.h> #include <sound/core.h> #include <sound/rawmidi.h> #include <sound/initval.h> #include <linux/serial_reg.h> #include <linux/jiffies.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_hw_array(port, long, ioport, NULL, 0444); MODULE_PARM_DESC(port, "Port # for UART16550A chip."); module_param_hw_array(irq, int, irq, 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 */ mod_timer(&uart->buffer_timer, jiffies + (HZ + 255) / 256); uart->timer_running = 1; } } 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(struct timer_list *t) { unsigned long flags; struct snd_uart16550 *uart; uart = from_timer(uart, t, buffer_timer); 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 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 const struct snd_rawmidi_ops snd_uart16550_output = { .open = snd_uart16550_output_open, .close = snd_uart16550_output_close, .trigger = snd_uart16550_output_trigger, }; static const 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 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); timer_setup(&uart->buffer_timer, snd_uart16550_buffer_timer, 0); 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 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 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 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_new(&devptr->dev, 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); 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 snd_serial_remove(struct platform_device *devptr) { snd_card_free(platform_get_drvdata(devptr)); return 0; } #define SND_SERIAL_DRIVER "snd_serial_u16550" static struct platform_driver snd_serial_driver = { .probe = snd_serial_probe, .remove = 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)