993 lines
30 KiB
C
993 lines
30 KiB
C
/*
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* serial.c
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* Copyright (c) by Jaroslav Kysela <perex@suse.cz>,
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* Isaku Yamahata <yamahata@private.email.ne.jp>,
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* George Hansper <ghansper@apana.org.au>,
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* Hannu Savolainen
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*
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* This code is based on the code from ALSA 0.5.9, but heavily rewritten.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Sat Mar 31 17:27:57 PST 2001 tim.mann@compaq.com
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* Added support for the Midiator MS-124T and for the MS-124W in
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* Single Addressed (S/A) or Multiple Burst (M/B) mode, with
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* power derived either parasitically from the serial port or
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* from a separate power supply.
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*
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* More documentation can be found in serial-u16550.txt.
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*/
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#include <sound/driver.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/ioport.h>
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#include <linux/moduleparam.h>
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#include <sound/core.h>
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#include <sound/rawmidi.h>
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#include <sound/initval.h>
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#include <linux/serial_reg.h>
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#include <asm/io.h>
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MODULE_DESCRIPTION("MIDI serial u16550");
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MODULE_LICENSE("GPL");
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MODULE_SUPPORTED_DEVICE("{{ALSA, MIDI serial u16550}}");
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#define SNDRV_SERIAL_SOUNDCANVAS 0 /* Roland Soundcanvas; F5 NN selects part */
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#define SNDRV_SERIAL_MS124T 1 /* Midiator MS-124T */
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#define SNDRV_SERIAL_MS124W_SA 2 /* Midiator MS-124W in S/A mode */
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#define SNDRV_SERIAL_MS124W_MB 3 /* Midiator MS-124W in M/B mode */
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#define SNDRV_SERIAL_GENERIC 4 /* Generic Interface */
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#define SNDRV_SERIAL_MAX_ADAPTOR SNDRV_SERIAL_GENERIC
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static char *adaptor_names[] = {
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"Soundcanvas",
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"MS-124T",
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"MS-124W S/A",
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"MS-124W M/B",
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"Generic"
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};
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#define SNDRV_SERIAL_NORMALBUFF 0 /* Normal blocking buffer operation */
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#define SNDRV_SERIAL_DROPBUFF 1 /* Non-blocking discard operation */
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static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX; /* Index 0-MAX */
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static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */
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static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; /* Enable this card */
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static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT; /* 0x3f8,0x2f8,0x3e8,0x2e8 */
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static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ; /* 3,4,5,7,9,10,11,14,15 */
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static int speed[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 38400}; /* 9600,19200,38400,57600,115200 */
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static int base[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 115200}; /* baud base */
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static int outs[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */
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static int ins[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; /* 1 to 16 */
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static int adaptor[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = SNDRV_SERIAL_SOUNDCANVAS};
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static int droponfull[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS -1)] = SNDRV_SERIAL_NORMALBUFF };
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module_param_array(index, int, NULL, 0444);
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MODULE_PARM_DESC(index, "Index value for Serial MIDI.");
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module_param_array(id, charp, NULL, 0444);
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MODULE_PARM_DESC(id, "ID string for Serial MIDI.");
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module_param_array(enable, bool, NULL, 0444);
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MODULE_PARM_DESC(enable, "Enable UART16550A chip.");
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module_param_array(port, long, NULL, 0444);
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MODULE_PARM_DESC(port, "Port # for UART16550A chip.");
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module_param_array(irq, int, NULL, 0444);
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MODULE_PARM_DESC(irq, "IRQ # for UART16550A chip.");
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module_param_array(speed, int, NULL, 0444);
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MODULE_PARM_DESC(speed, "Speed in bauds.");
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module_param_array(base, int, NULL, 0444);
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MODULE_PARM_DESC(base, "Base for divisor in bauds.");
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module_param_array(outs, int, NULL, 0444);
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MODULE_PARM_DESC(outs, "Number of MIDI outputs.");
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module_param_array(ins, int, NULL, 0444);
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MODULE_PARM_DESC(ins, "Number of MIDI inputs.");
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module_param_array(droponfull, bool, NULL, 0444);
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MODULE_PARM_DESC(droponfull, "Flag to enable drop-on-full buffer mode");
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module_param_array(adaptor, int, NULL, 0444);
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MODULE_PARM_DESC(adaptor, "Type of adaptor.");
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/*#define SNDRV_SERIAL_MS124W_MB_NOCOMBO 1*/ /* Address outs as 0-3 instead of bitmap */
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#define SNDRV_SERIAL_MAX_OUTS 16 /* max 64, min 16 */
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#define SNDRV_SERIAL_MAX_INS 16 /* max 64, min 16 */
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#define TX_BUFF_SIZE (1<<15) /* Must be 2^n */
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#define TX_BUFF_MASK (TX_BUFF_SIZE - 1)
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#define SERIAL_MODE_NOT_OPENED (0)
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#define SERIAL_MODE_INPUT_OPEN (1 << 0)
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#define SERIAL_MODE_OUTPUT_OPEN (1 << 1)
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#define SERIAL_MODE_INPUT_TRIGGERED (1 << 2)
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#define SERIAL_MODE_OUTPUT_TRIGGERED (1 << 3)
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typedef struct _snd_uart16550 {
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snd_card_t *card;
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snd_rawmidi_t *rmidi;
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snd_rawmidi_substream_t *midi_output[SNDRV_SERIAL_MAX_OUTS];
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snd_rawmidi_substream_t *midi_input[SNDRV_SERIAL_MAX_INS];
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int filemode; //open status of file
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spinlock_t open_lock;
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int irq;
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unsigned long base;
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struct resource *res_base;
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unsigned int speed;
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unsigned int speed_base;
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unsigned char divisor;
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unsigned char old_divisor_lsb;
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unsigned char old_divisor_msb;
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unsigned char old_line_ctrl_reg;
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// parameter for using of write loop
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short int fifo_limit; //used in uart16550
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short int fifo_count; //used in uart16550
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// type of adaptor
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int adaptor;
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// inputs
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int prev_in;
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unsigned char rstatus;
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// outputs
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int prev_out;
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unsigned char prev_status[SNDRV_SERIAL_MAX_OUTS];
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// write buffer and its writing/reading position
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unsigned char tx_buff[TX_BUFF_SIZE];
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int buff_in_count;
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int buff_in;
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int buff_out;
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int drop_on_full;
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// wait timer
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unsigned int timer_running:1;
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struct timer_list buffer_timer;
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} snd_uart16550_t;
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static snd_card_t *snd_serial_cards[SNDRV_CARDS] = SNDRV_DEFAULT_PTR;
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static inline void snd_uart16550_add_timer(snd_uart16550_t *uart)
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{
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if (! uart->timer_running) {
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/* timer 38600bps * 10bit * 16byte */
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uart->buffer_timer.expires = jiffies + (HZ+255)/256;
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uart->timer_running = 1;
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add_timer(&uart->buffer_timer);
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}
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}
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static inline void snd_uart16550_del_timer(snd_uart16550_t *uart)
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{
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if (uart->timer_running) {
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del_timer(&uart->buffer_timer);
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uart->timer_running = 0;
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}
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}
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/* This macro is only used in snd_uart16550_io_loop */
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static inline void snd_uart16550_buffer_output(snd_uart16550_t *uart)
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{
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unsigned short buff_out = uart->buff_out;
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if( uart->buff_in_count > 0 ) {
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outb(uart->tx_buff[buff_out], uart->base + UART_TX);
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uart->fifo_count++;
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buff_out++;
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buff_out &= TX_BUFF_MASK;
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uart->buff_out = buff_out;
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uart->buff_in_count--;
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}
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}
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/* This loop should be called with interrupts disabled
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* We don't want to interrupt this,
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* as we're already handling an interrupt
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*/
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static void snd_uart16550_io_loop(snd_uart16550_t * uart)
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{
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unsigned char c, status;
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int substream;
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/* recall previous stream */
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substream = uart->prev_in;
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/* Read Loop */
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while ((status = inb(uart->base + UART_LSR)) & UART_LSR_DR) {
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/* while receive data ready */
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c = inb(uart->base + UART_RX);
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/* keep track of last status byte */
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if (c & 0x80) {
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uart->rstatus = c;
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}
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/* handle stream switch */
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if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
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if (uart->rstatus == 0xf5) {
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if (c <= SNDRV_SERIAL_MAX_INS && c > 0)
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substream = c - 1;
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if (c != 0xf5)
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uart->rstatus = 0; /* prevent future bytes from being interpreted as streams */
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}
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else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) && (uart->midi_input[substream] != NULL)) {
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snd_rawmidi_receive(uart->midi_input[substream], &c, 1);
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}
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} else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) && (uart->midi_input[substream] != NULL)) {
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snd_rawmidi_receive(uart->midi_input[substream], &c, 1);
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}
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if (status & UART_LSR_OE)
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snd_printk("%s: Overrun on device at 0x%lx\n",
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uart->rmidi->name, uart->base);
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}
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/* remember the last stream */
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uart->prev_in = substream;
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/* no need of check SERIAL_MODE_OUTPUT_OPEN because if not,
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buffer is never filled. */
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/* Check write status */
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if (status & UART_LSR_THRE) {
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uart->fifo_count = 0;
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}
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if (uart->adaptor == SNDRV_SERIAL_MS124W_SA
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|| uart->adaptor == SNDRV_SERIAL_GENERIC) {
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/* Can't use FIFO, must send only when CTS is true */
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status = inb(uart->base + UART_MSR);
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while( (uart->fifo_count == 0) && (status & UART_MSR_CTS) &&
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(uart->buff_in_count > 0) ) {
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snd_uart16550_buffer_output(uart);
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status = inb( uart->base + UART_MSR );
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}
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} else {
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/* Write loop */
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while (uart->fifo_count < uart->fifo_limit /* Can we write ? */
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&& uart->buff_in_count > 0) /* Do we want to? */
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snd_uart16550_buffer_output(uart);
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}
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if (uart->irq < 0 && uart->buff_in_count > 0)
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snd_uart16550_add_timer(uart);
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}
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/* NOTES ON SERVICING INTERUPTS
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* ---------------------------
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* After receiving a interrupt, it is important to indicate to the UART that
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* this has been done.
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* For a Rx interrupt, this is done by reading the received byte.
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* For a Tx interrupt this is done by either:
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* a) Writing a byte
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* b) Reading the IIR
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* It is particularly important to read the IIR if a Tx interrupt is received
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* when there is no data in tx_buff[], as in this case there no other
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* indication that the interrupt has been serviced, and it remains outstanding
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* indefinitely. This has the curious side effect that and no further interrupts
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* will be generated from this device AT ALL!!.
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* It is also desirable to clear outstanding interrupts when the device is
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* opened/closed.
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*
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*
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* Note that some devices need OUT2 to be set before they will generate
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* interrupts at all. (Possibly tied to an internal pull-up on CTS?)
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*/
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static irqreturn_t snd_uart16550_interrupt(int irq, void *dev_id, struct pt_regs *regs)
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{
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snd_uart16550_t *uart;
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uart = (snd_uart16550_t *) dev_id;
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spin_lock(&uart->open_lock);
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if (uart->filemode == SERIAL_MODE_NOT_OPENED) {
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spin_unlock(&uart->open_lock);
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return IRQ_NONE;
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}
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inb(uart->base + UART_IIR); /* indicate to the UART that the interrupt has been serviced */
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snd_uart16550_io_loop(uart);
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spin_unlock(&uart->open_lock);
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return IRQ_HANDLED;
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}
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/* When the polling mode, this function calls snd_uart16550_io_loop. */
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static void snd_uart16550_buffer_timer(unsigned long data)
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{
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unsigned long flags;
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snd_uart16550_t *uart;
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uart = (snd_uart16550_t *)data;
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spin_lock_irqsave(&uart->open_lock, flags);
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snd_uart16550_del_timer(uart);
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snd_uart16550_io_loop(uart);
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spin_unlock_irqrestore(&uart->open_lock, flags);
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}
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/*
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* this method probes, if an uart sits on given port
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* return 0 if found
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* return negative error if not found
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*/
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static int __init snd_uart16550_detect(snd_uart16550_t *uart)
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{
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unsigned long io_base = uart->base;
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int ok;
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unsigned char c;
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/* Do some vague tests for the presence of the uart */
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if (io_base == 0 || io_base == SNDRV_AUTO_PORT) {
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return -ENODEV; /* Not configured */
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}
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uart->res_base = request_region(io_base, 8, "Serial MIDI");
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if (uart->res_base == NULL) {
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snd_printk(KERN_ERR "u16550: can't grab port 0x%lx\n", io_base);
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return -EBUSY;
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}
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ok = 1; /* uart detected unless one of the following tests should fail */
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/* 8 data-bits, 1 stop-bit, parity off, DLAB = 0 */
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outb(UART_LCR_WLEN8, io_base + UART_LCR); /* Line Control Register */
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c = inb(io_base + UART_IER);
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/* The top four bits of the IER should always == 0 */
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if ((c & 0xf0) != 0)
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ok = 0; /* failed */
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outb(0xaa, io_base + UART_SCR);
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/* Write arbitrary data into the scratch reg */
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c = inb(io_base + UART_SCR);
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/* If it comes back, it's OK */
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if (c != 0xaa)
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ok = 0; /* failed */
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outb(0x55, io_base + UART_SCR);
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/* Write arbitrary data into the scratch reg */
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c = inb(io_base + UART_SCR);
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/* If it comes back, it's OK */
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if (c != 0x55)
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ok = 0; /* failed */
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return ok;
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}
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static void snd_uart16550_do_open(snd_uart16550_t * uart)
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{
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char byte;
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/* Initialize basic variables */
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uart->buff_in_count = 0;
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uart->buff_in = 0;
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uart->buff_out = 0;
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uart->fifo_limit = 1;
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uart->fifo_count = 0;
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uart->timer_running = 0;
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outb(UART_FCR_ENABLE_FIFO /* Enable FIFO's (if available) */
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| UART_FCR_CLEAR_RCVR /* Clear receiver FIFO */
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| UART_FCR_CLEAR_XMIT /* Clear transmitter FIFO */
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| UART_FCR_TRIGGER_4 /* Set FIFO trigger at 4-bytes */
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/* NOTE: interrupt generated after T=(time)4-bytes
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* if less than UART_FCR_TRIGGER bytes received
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*/
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,uart->base + UART_FCR); /* FIFO Control Register */
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if ((inb(uart->base + UART_IIR) & 0xf0) == 0xc0)
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uart->fifo_limit = 16;
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if (uart->divisor != 0) {
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uart->old_line_ctrl_reg = inb(uart->base + UART_LCR);
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outb(UART_LCR_DLAB /* Divisor latch access bit */
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,uart->base + UART_LCR); /* Line Control Register */
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uart->old_divisor_lsb = inb(uart->base + UART_DLL);
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uart->old_divisor_msb = inb(uart->base + UART_DLM);
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outb(uart->divisor
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,uart->base + UART_DLL); /* Divisor Latch Low */
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outb(0
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,uart->base + UART_DLM); /* Divisor Latch High */
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/* DLAB is reset to 0 in next outb() */
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}
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/* Set serial parameters (parity off, etc) */
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outb(UART_LCR_WLEN8 /* 8 data-bits */
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| 0 /* 1 stop-bit */
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| 0 /* parity off */
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| 0 /* DLAB = 0 */
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,uart->base + UART_LCR); /* Line Control Register */
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switch (uart->adaptor) {
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default:
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outb(UART_MCR_RTS /* Set Request-To-Send line active */
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| UART_MCR_DTR /* Set Data-Terminal-Ready line active */
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| UART_MCR_OUT2 /* Set OUT2 - not always required, but when
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* it is, it is ESSENTIAL for enabling interrupts
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*/
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,uart->base + UART_MCR); /* Modem Control Register */
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break;
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case SNDRV_SERIAL_MS124W_SA:
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case SNDRV_SERIAL_MS124W_MB:
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/* MS-124W can draw power from RTS and DTR if they
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are in opposite states. */
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outb(UART_MCR_RTS | (0&UART_MCR_DTR) | UART_MCR_OUT2,
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uart->base + UART_MCR);
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break;
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case SNDRV_SERIAL_MS124T:
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/* MS-124T can draw power from RTS and/or DTR (preferably
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both) if they are both asserted. */
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outb(UART_MCR_RTS | UART_MCR_DTR | UART_MCR_OUT2,
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uart->base + UART_MCR);
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break;
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}
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if (uart->irq < 0) {
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byte = (0 & UART_IER_RDI) /* Disable Receiver data interrupt */
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|(0 & UART_IER_THRI) /* Disable Transmitter holding register empty interrupt */
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;
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} else if (uart->adaptor == SNDRV_SERIAL_MS124W_SA) {
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byte = UART_IER_RDI /* Enable Receiver data interrupt */
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| UART_IER_MSI /* Enable Modem status interrupt */
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;
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} else if (uart->adaptor == SNDRV_SERIAL_GENERIC) {
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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); /* Interupt 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(snd_uart16550_t * 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); /* Interupt 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(snd_rawmidi_substream_t * substream)
|
|
{
|
|
unsigned long flags;
|
|
snd_uart16550_t *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(snd_rawmidi_substream_t * substream)
|
|
{
|
|
unsigned long flags;
|
|
snd_uart16550_t *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(snd_rawmidi_substream_t * substream, int up)
|
|
{
|
|
unsigned long flags;
|
|
snd_uart16550_t *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(snd_rawmidi_substream_t * substream)
|
|
{
|
|
unsigned long flags;
|
|
snd_uart16550_t *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(snd_rawmidi_substream_t * substream)
|
|
{
|
|
unsigned long flags;
|
|
snd_uart16550_t *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( snd_uart16550_t *uart, int Num )
|
|
{
|
|
if( uart->buff_in_count + Num < TX_BUFF_SIZE )
|
|
return 1;
|
|
else
|
|
return 0;
|
|
}
|
|
|
|
static inline int snd_uart16550_write_buffer(snd_uart16550_t *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(snd_uart16550_t *uart, snd_rawmidi_substream_t * 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("%s: Buffer overrun on device at 0x%lx\n",
|
|
uart->rmidi->name, uart->base);
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static void snd_uart16550_output_write(snd_rawmidi_substream_t * substream)
|
|
{
|
|
unsigned long flags;
|
|
unsigned char midi_byte, addr_byte;
|
|
snd_uart16550_t *uart = substream->rmidi->private_data;
|
|
char first;
|
|
static unsigned long lasttime=0;
|
|
|
|
/* Interupts 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( 1 == snd_rawmidi_transmit_peek(substream, &midi_byte, 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 || 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(snd_rawmidi_substream_t * substream, int up)
|
|
{
|
|
unsigned long flags;
|
|
snd_uart16550_t *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 snd_rawmidi_ops_t snd_uart16550_output =
|
|
{
|
|
.open = snd_uart16550_output_open,
|
|
.close = snd_uart16550_output_close,
|
|
.trigger = snd_uart16550_output_trigger,
|
|
};
|
|
|
|
static snd_rawmidi_ops_t snd_uart16550_input =
|
|
{
|
|
.open = snd_uart16550_input_open,
|
|
.close = snd_uart16550_input_close,
|
|
.trigger = snd_uart16550_input_trigger,
|
|
};
|
|
|
|
static int snd_uart16550_free(snd_uart16550_t *uart)
|
|
{
|
|
if (uart->irq >= 0)
|
|
free_irq(uart->irq, (void *)uart);
|
|
if (uart->res_base) {
|
|
release_resource(uart->res_base);
|
|
kfree_nocheck(uart->res_base);
|
|
}
|
|
kfree(uart);
|
|
return 0;
|
|
};
|
|
|
|
static int snd_uart16550_dev_free(snd_device_t *device)
|
|
{
|
|
snd_uart16550_t *uart = device->device_data;
|
|
return snd_uart16550_free(uart);
|
|
}
|
|
|
|
static int __init snd_uart16550_create(snd_card_t * card,
|
|
unsigned long iobase,
|
|
int irq,
|
|
unsigned int speed,
|
|
unsigned int base,
|
|
int adaptor,
|
|
int droponfull,
|
|
snd_uart16550_t **ruart)
|
|
{
|
|
static snd_device_ops_t ops = {
|
|
.dev_free = snd_uart16550_dev_free,
|
|
};
|
|
snd_uart16550_t *uart;
|
|
int err;
|
|
|
|
|
|
if ((uart = kcalloc(1, 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);
|
|
return err;
|
|
}
|
|
|
|
if (irq >= 0 && irq != SNDRV_AUTO_IRQ) {
|
|
if (request_irq(irq, snd_uart16550_interrupt,
|
|
SA_INTERRUPT, "Serial MIDI", (void *) uart)) {
|
|
snd_printk("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 __init snd_uart16550_substreams(snd_rawmidi_str_t *stream)
|
|
{
|
|
struct list_head *list;
|
|
|
|
list_for_each(list, &stream->substreams) {
|
|
snd_rawmidi_substream_t *substream = list_entry(list, snd_rawmidi_substream_t, list);
|
|
sprintf(substream->name, "Serial MIDI %d", substream->number + 1);
|
|
}
|
|
}
|
|
|
|
static int __init snd_uart16550_rmidi(snd_uart16550_t *uart, int device, int outs, int ins, snd_rawmidi_t **rmidi)
|
|
{
|
|
snd_rawmidi_t *rrawmidi;
|
|
int err;
|
|
|
|
if ((err = snd_rawmidi_new(uart->card, "UART Serial MIDI", device, outs, ins, &rrawmidi)) < 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 __init snd_serial_probe(int dev)
|
|
{
|
|
snd_card_t *card;
|
|
snd_uart16550_t *uart;
|
|
int err;
|
|
|
|
if (!enable[dev])
|
|
return -ENOENT;
|
|
|
|
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("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("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("Count of inputs is out of range 1-%d (%d)\n",
|
|
SNDRV_SERIAL_MAX_INS, ins[dev]);
|
|
return -ENODEV;
|
|
}
|
|
|
|
card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
|
|
if (card == NULL)
|
|
return -ENOMEM;
|
|
|
|
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;
|
|
|
|
if ((err = snd_uart16550_rmidi(uart, 0, outs[dev], ins[dev], &uart->rmidi)) < 0)
|
|
goto _err;
|
|
|
|
sprintf(card->longname, "%s at 0x%lx, irq %d speed %d div %d outs %d ins %d adaptor %s droponfull %d",
|
|
card->shortname,
|
|
uart->base,
|
|
uart->irq,
|
|
uart->speed,
|
|
(int)uart->divisor,
|
|
outs[dev],
|
|
ins[dev],
|
|
adaptor_names[uart->adaptor],
|
|
uart->drop_on_full);
|
|
|
|
if ((err = snd_card_set_generic_dev(card)) < 0)
|
|
goto _err;
|
|
|
|
if ((err = snd_card_register(card)) < 0)
|
|
goto _err;
|
|
|
|
snd_serial_cards[dev] = card;
|
|
return 0;
|
|
|
|
_err:
|
|
snd_card_free(card);
|
|
return err;
|
|
}
|
|
|
|
static int __init alsa_card_serial_init(void)
|
|
{
|
|
int dev = 0;
|
|
int cards = 0;
|
|
|
|
for (dev = 0; dev < SNDRV_CARDS; dev++) {
|
|
if (snd_serial_probe(dev) == 0)
|
|
cards++;
|
|
}
|
|
|
|
if (cards == 0) {
|
|
#ifdef MODULE
|
|
printk(KERN_ERR "serial midi soundcard not found or device busy\n");
|
|
#endif
|
|
return -ENODEV;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void __exit alsa_card_serial_exit(void)
|
|
{
|
|
int dev;
|
|
|
|
for (dev = 0; dev < SNDRV_CARDS; dev++) {
|
|
if (snd_serial_cards[dev] != NULL)
|
|
snd_card_free(snd_serial_cards[dev]);
|
|
}
|
|
}
|
|
|
|
module_init(alsa_card_serial_init)
|
|
module_exit(alsa_card_serial_exit)
|