cregit-Linux how code gets into the kernel

Release 4.8 sound/drivers/serial-u16550.c

Directory: sound/drivers
/*
 *   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_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 */ mod_timer(&uart->buffer_timer, jiffies + (HZ + 255) / 256); uart->timer_running = 1; } }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela3882.61%125.00%
takashi iwaitakashi iwai715.22%250.00%
jesper juhljesper juhl12.17%125.00%
Total46100.00%4100.00%


static inline void snd_uart16550_del_timer(struct snd_uart16550 *uart) { if (uart->timer_running) { del_timer(&uart->buffer_timer); uart->timer_running = 0; } }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela3191.18%133.33%
takashi iwaitakashi iwai25.88%133.33%
jesper juhljesper juhl12.94%133.33%
Total34100.00%3100.00%

/* 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--; } }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela6695.65%250.00%
takashi iwaitakashi iwai22.90%125.00%
jesper juhljesper juhl11.45%125.00%
Total69100.00%4100.00%

/* 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); }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela33998.83%360.00%
takashi iwaitakashi iwai41.17%240.00%
Total343100.00%5100.00%

/* 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; }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela6787.01%250.00%
andrew mortonandrew morton79.09%125.00%
takashi iwaitakashi iwai33.90%125.00%
Total77100.00%4100.00%

/* 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); }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela5493.10%266.67%
takashi iwaitakashi iwai46.90%133.33%
Total58100.00%3100.00%

/* * 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; }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela18298.38%480.00%
takashi iwaitakashi iwai31.62%120.00%
Total185100.00%5100.00%


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 */ }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela39697.78%240.00%
steven colesteven cole61.48%120.00%
takashi iwaitakashi iwai20.49%120.00%
joe perchesjoe perches10.25%120.00%
Total405100.00%5100.00%


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 */ } }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela21697.30%125.00%
steven colesteven cole31.35%125.00%
takashi iwaitakashi iwai20.90%125.00%
joe perchesjoe perches10.45%125.00%
Total222100.00%4100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela7594.94%360.00%
takashi iwaitakashi iwai45.06%240.00%
Total79100.00%5100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela7695.00%360.00%
takashi iwaitakashi iwai45.00%240.00%
Total80100.00%5100.00%


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); }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela6394.03%250.00%
takashi iwaitakashi iwai45.97%250.00%
Total67100.00%4100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela7594.94%250.00%
takashi iwaitakashi iwai45.06%250.00%
Total79100.00%4100.00%

;
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; }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela7695.00%250.00%
takashi iwaitakashi iwai45.00%250.00%
Total80100.00%4100.00%

;
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; }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela2990.62%133.33%
takashi iwaitakashi iwai26.25%133.33%
jesper juhljesper juhl13.12%133.33%
Total32100.00%3100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela7996.34%250.00%
takashi iwaitakashi iwai22.44%125.00%
jesper juhljesper juhl11.22%125.00%
Total82100.00%4100.00%


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; }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela18196.79%350.00%
takashi iwaitakashi iwai63.21%350.00%
Total187100.00%6100.00%


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->