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![Takashi Iwai](/assets/img/avatar_default.png)
Apply const prefix to the string array. Just for minor optimization and no functional changes. Link: https://lore.kernel.org/r/20200105144823.29547-59-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
1031 lines
30 KiB
C
1031 lines
30 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* serial.c
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* Copyright (c) by Jaroslav Kysela <perex@perex.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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* 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 <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/ioport.h>
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#include <linux/module.h>
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#include <linux/io.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 <linux/jiffies.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 const char * const 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 bool 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 bool 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_hw_array(port, long, ioport, NULL, 0444);
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MODULE_PARM_DESC(port, "Port # for UART16550A chip.");
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module_param_hw_array(irq, int, irq, 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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struct snd_uart16550 {
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struct snd_card *card;
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struct snd_rawmidi *rmidi;
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struct snd_rawmidi_substream *midi_output[SNDRV_SERIAL_MAX_OUTS];
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struct snd_rawmidi_substream *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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};
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static struct platform_device *devices[SNDRV_CARDS];
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static inline void snd_uart16550_add_timer(struct snd_uart16550 *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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mod_timer(&uart->buffer_timer, jiffies + (HZ + 255) / 256);
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uart->timer_running = 1;
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}
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}
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static inline void snd_uart16550_del_timer(struct snd_uart16550 *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(struct snd_uart16550 *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(struct snd_uart16550 * 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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/* 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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/* prevent future bytes from being
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interpreted as streams */
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uart->rstatus = 0;
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} else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN)
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&& uart->midi_input[substream])
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snd_rawmidi_receive(uart->midi_input[substream],
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&c, 1);
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} else if ((uart->filemode & SERIAL_MODE_INPUT_OPEN) &&
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uart->midi_input[substream])
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snd_rawmidi_receive(uart->midi_input[substream], &c, 1);
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if (status & UART_LSR_OE)
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snd_printk(KERN_WARNING
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"%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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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)
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{
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struct snd_uart16550 *uart;
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uart = 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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/* indicate to the UART that the interrupt has been serviced */
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inb(uart->base + UART_IIR);
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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(struct timer_list *t)
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{
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unsigned long flags;
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struct snd_uart16550 *uart;
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uart = from_timer(uart, t, buffer_timer);
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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 snd_uart16550_detect(struct snd_uart16550 *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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/* uart detected unless one of the following tests should fail */
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ok = 1;
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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(struct snd_uart16550 * 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 */
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| UART_IER_MSI /* Enable Modem status interrupt */
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| UART_IER_THRI /* Enable Transmitter holding register empty interrupt */
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;
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} 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 const 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)
|