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1030 lines
30 KiB
1030 lines
30 KiB
// 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 <[email protected]>, |
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* Isaku Yamahata <[email protected]>, |
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* George Hansper <[email protected]>, |
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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 [email protected] |
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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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|
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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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#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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|
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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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|
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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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|
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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 { |
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byte = UART_IER_RDI /* Enable Receiver data interrupt */ |
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| UART_IER_THRI /* Enable Transmitter holding register empty interrupt */ |
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; |
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} |
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outb(byte, uart->base + UART_IER); /* Interrupt enable Register */ |
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|
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inb(uart->base + UART_LSR); /* Clear any pre-existing overrun indication */ |
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inb(uart->base + UART_IIR); /* Clear any pre-existing transmit interrupt */ |
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inb(uart->base + UART_RX); /* Clear any pre-existing receive interrupt */ |
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} |
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|
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static void snd_uart16550_do_close(struct snd_uart16550 * uart) |
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{ |
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if (uart->irq < 0) |
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snd_uart16550_del_timer(uart); |
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|
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/* NOTE: may need to disable interrupts before de-registering out handler. |
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* For now, the consequences are harmless. |
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*/ |
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|
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outb((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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,uart->base + UART_IER); /* Interrupt enable Register */ |
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|
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switch (uart->adaptor) { |
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default: |
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outb((0 & UART_MCR_RTS) /* Deactivate Request-To-Send line */ |
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|(0 & UART_MCR_DTR) /* Deactivate Data-Terminal-Ready line */ |
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|(0 & UART_MCR_OUT2) /* Deactivate OUT2 */ |
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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; leave it powered. */ |
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outb(UART_MCR_RTS | (0&UART_MCR_DTR) | (0&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; leave it powered. */ |
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outb(UART_MCR_RTS | UART_MCR_DTR | (0&UART_MCR_OUT2), |
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uart->base + UART_MCR); |
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break; |
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} |
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|
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inb(uart->base + UART_IIR); /* Clear any outstanding interrupts */ |
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|
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/* Restore old divisor */ |
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if (uart->divisor != 0) { |
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outb(UART_LCR_DLAB /* Divisor latch access bit */ |
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,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)
|
|
|