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604 lines
16 KiB
604 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Copyright (c) by Jaroslav Kysela <[email protected]> |
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* Routines for control of MPU-401 in UART mode |
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* |
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* MPU-401 supports UART mode which is not capable generate transmit |
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* interrupts thus output is done via polling. Without interrupt, |
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* input is done also via polling. Do not expect good performance. |
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* |
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* 13-03-2003: |
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* Added support for different kind of hardware I/O. Build in choices |
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* are port and mmio. For other kind of I/O, set mpu->read and |
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* mpu->write to your own I/O functions. |
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*/ |
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#include <linux/io.h> |
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#include <linux/delay.h> |
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#include <linux/init.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/interrupt.h> |
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#include <linux/errno.h> |
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#include <sound/core.h> |
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#include <sound/mpu401.h> |
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MODULE_AUTHOR("Jaroslav Kysela <[email protected]>"); |
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MODULE_DESCRIPTION("Routines for control of MPU-401 in UART mode"); |
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MODULE_LICENSE("GPL"); |
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static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu); |
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static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu); |
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|
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/* |
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*/ |
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#define snd_mpu401_input_avail(mpu) \ |
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(!(mpu->read(mpu, MPU401C(mpu)) & MPU401_RX_EMPTY)) |
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#define snd_mpu401_output_ready(mpu) \ |
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(!(mpu->read(mpu, MPU401C(mpu)) & MPU401_TX_FULL)) |
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|
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/* Build in lowlevel io */ |
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static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data, |
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unsigned long addr) |
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{ |
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outb(data, addr); |
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} |
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static unsigned char mpu401_read_port(struct snd_mpu401 *mpu, |
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unsigned long addr) |
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{ |
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return inb(addr); |
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} |
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static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data, |
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unsigned long addr) |
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{ |
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writeb(data, (void __iomem *)addr); |
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} |
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static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu, |
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unsigned long addr) |
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{ |
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return readb((void __iomem *)addr); |
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} |
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/* */ |
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static void snd_mpu401_uart_clear_rx(struct snd_mpu401 *mpu) |
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{ |
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int timeout = 100000; |
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for (; timeout > 0 && snd_mpu401_input_avail(mpu); timeout--) |
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mpu->read(mpu, MPU401D(mpu)); |
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#ifdef CONFIG_SND_DEBUG |
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if (timeout <= 0) |
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snd_printk(KERN_ERR "cmd: clear rx timeout (status = 0x%x)\n", |
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mpu->read(mpu, MPU401C(mpu))); |
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#endif |
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} |
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static void uart_interrupt_tx(struct snd_mpu401 *mpu) |
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{ |
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unsigned long flags; |
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if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) && |
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test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) { |
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spin_lock_irqsave(&mpu->output_lock, flags); |
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snd_mpu401_uart_output_write(mpu); |
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spin_unlock_irqrestore(&mpu->output_lock, flags); |
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} |
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} |
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static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu) |
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{ |
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unsigned long flags; |
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if (mpu->info_flags & MPU401_INFO_INPUT) { |
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spin_lock_irqsave(&mpu->input_lock, flags); |
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if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) |
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snd_mpu401_uart_input_read(mpu); |
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else |
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snd_mpu401_uart_clear_rx(mpu); |
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spin_unlock_irqrestore(&mpu->input_lock, flags); |
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} |
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if (! (mpu->info_flags & MPU401_INFO_TX_IRQ)) |
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/* ok. for better Tx performance try do some output |
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when input is done */ |
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uart_interrupt_tx(mpu); |
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} |
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/** |
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* snd_mpu401_uart_interrupt - generic MPU401-UART interrupt handler |
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* @irq: the irq number |
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* @dev_id: mpu401 instance |
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* |
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* Processes the interrupt for MPU401-UART i/o. |
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* |
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* Return: %IRQ_HANDLED if the interrupt was handled. %IRQ_NONE otherwise. |
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*/ |
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irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id) |
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{ |
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struct snd_mpu401 *mpu = dev_id; |
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if (!mpu) |
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return IRQ_NONE; |
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_snd_mpu401_uart_interrupt(mpu); |
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return IRQ_HANDLED; |
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} |
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EXPORT_SYMBOL(snd_mpu401_uart_interrupt); |
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/** |
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* snd_mpu401_uart_interrupt_tx - generic MPU401-UART transmit irq handler |
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* @irq: the irq number |
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* @dev_id: mpu401 instance |
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* |
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* Processes the interrupt for MPU401-UART output. |
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* |
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* Return: %IRQ_HANDLED if the interrupt was handled. %IRQ_NONE otherwise. |
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*/ |
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irqreturn_t snd_mpu401_uart_interrupt_tx(int irq, void *dev_id) |
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{ |
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struct snd_mpu401 *mpu = dev_id; |
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if (!mpu) |
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return IRQ_NONE; |
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uart_interrupt_tx(mpu); |
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return IRQ_HANDLED; |
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} |
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EXPORT_SYMBOL(snd_mpu401_uart_interrupt_tx); |
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/* |
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* timer callback |
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* reprogram the timer and call the interrupt job |
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*/ |
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static void snd_mpu401_uart_timer(struct timer_list *t) |
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{ |
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struct snd_mpu401 *mpu = from_timer(mpu, t, timer); |
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unsigned long flags; |
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spin_lock_irqsave(&mpu->timer_lock, flags); |
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/*mpu->mode |= MPU401_MODE_TIMER;*/ |
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mod_timer(&mpu->timer, 1 + jiffies); |
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spin_unlock_irqrestore(&mpu->timer_lock, flags); |
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if (mpu->rmidi) |
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_snd_mpu401_uart_interrupt(mpu); |
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} |
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/* |
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* initialize the timer callback if not programmed yet |
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*/ |
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static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave (&mpu->timer_lock, flags); |
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if (mpu->timer_invoked == 0) { |
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timer_setup(&mpu->timer, snd_mpu401_uart_timer, 0); |
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mod_timer(&mpu->timer, 1 + jiffies); |
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} |
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mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER : |
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MPU401_MODE_OUTPUT_TIMER; |
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spin_unlock_irqrestore (&mpu->timer_lock, flags); |
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} |
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/* |
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* remove the timer callback if still active |
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*/ |
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static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input) |
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{ |
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unsigned long flags; |
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spin_lock_irqsave (&mpu->timer_lock, flags); |
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if (mpu->timer_invoked) { |
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mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER : |
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~MPU401_MODE_OUTPUT_TIMER; |
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if (! mpu->timer_invoked) |
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del_timer(&mpu->timer); |
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} |
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spin_unlock_irqrestore (&mpu->timer_lock, flags); |
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} |
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/* |
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* send a UART command |
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* return zero if successful, non-zero for some errors |
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*/ |
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static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd, |
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int ack) |
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{ |
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unsigned long flags; |
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int timeout, ok; |
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spin_lock_irqsave(&mpu->input_lock, flags); |
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if (mpu->hardware != MPU401_HW_TRID4DWAVE) { |
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mpu->write(mpu, 0x00, MPU401D(mpu)); |
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/*snd_mpu401_uart_clear_rx(mpu);*/ |
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} |
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/* ok. standard MPU-401 initialization */ |
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if (mpu->hardware != MPU401_HW_SB) { |
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for (timeout = 1000; timeout > 0 && |
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!snd_mpu401_output_ready(mpu); timeout--) |
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udelay(10); |
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#ifdef CONFIG_SND_DEBUG |
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if (!timeout) |
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snd_printk(KERN_ERR "cmd: tx timeout (status = 0x%x)\n", |
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mpu->read(mpu, MPU401C(mpu))); |
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#endif |
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} |
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mpu->write(mpu, cmd, MPU401C(mpu)); |
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if (ack && !(mpu->info_flags & MPU401_INFO_NO_ACK)) { |
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ok = 0; |
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timeout = 10000; |
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while (!ok && timeout-- > 0) { |
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if (snd_mpu401_input_avail(mpu)) { |
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if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK) |
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ok = 1; |
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} |
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} |
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if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK) |
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ok = 1; |
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} else |
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ok = 1; |
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spin_unlock_irqrestore(&mpu->input_lock, flags); |
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if (!ok) { |
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snd_printk(KERN_ERR "cmd: 0x%x failed at 0x%lx " |
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"(status = 0x%x, data = 0x%x)\n", cmd, mpu->port, |
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mpu->read(mpu, MPU401C(mpu)), |
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mpu->read(mpu, MPU401D(mpu))); |
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return 1; |
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} |
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return 0; |
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} |
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static int snd_mpu401_do_reset(struct snd_mpu401 *mpu) |
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{ |
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if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1)) |
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return -EIO; |
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if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 0)) |
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return -EIO; |
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return 0; |
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} |
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/* |
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* input/output open/close - protected by open_mutex in rawmidi.c |
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*/ |
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static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream) |
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{ |
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struct snd_mpu401 *mpu; |
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int err; |
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mpu = substream->rmidi->private_data; |
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if (mpu->open_input && (err = mpu->open_input(mpu)) < 0) |
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return err; |
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if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) { |
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if (snd_mpu401_do_reset(mpu) < 0) |
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goto error_out; |
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} |
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mpu->substream_input = substream; |
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set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode); |
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return 0; |
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error_out: |
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if (mpu->open_input && mpu->close_input) |
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mpu->close_input(mpu); |
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return -EIO; |
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} |
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static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream) |
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{ |
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struct snd_mpu401 *mpu; |
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int err; |
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mpu = substream->rmidi->private_data; |
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if (mpu->open_output && (err = mpu->open_output(mpu)) < 0) |
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return err; |
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if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) { |
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if (snd_mpu401_do_reset(mpu) < 0) |
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goto error_out; |
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} |
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mpu->substream_output = substream; |
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set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode); |
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return 0; |
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error_out: |
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if (mpu->open_output && mpu->close_output) |
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mpu->close_output(mpu); |
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return -EIO; |
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} |
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static int snd_mpu401_uart_input_close(struct snd_rawmidi_substream *substream) |
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{ |
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struct snd_mpu401 *mpu; |
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int err = 0; |
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mpu = substream->rmidi->private_data; |
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clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode); |
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mpu->substream_input = NULL; |
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if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) |
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err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0); |
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if (mpu->close_input) |
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mpu->close_input(mpu); |
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if (err) |
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return -EIO; |
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return 0; |
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} |
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static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream) |
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{ |
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struct snd_mpu401 *mpu; |
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int err = 0; |
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mpu = substream->rmidi->private_data; |
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clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode); |
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mpu->substream_output = NULL; |
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if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) |
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err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0); |
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if (mpu->close_output) |
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mpu->close_output(mpu); |
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if (err) |
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return -EIO; |
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return 0; |
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} |
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/* |
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* trigger input callback |
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*/ |
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static void |
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snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up) |
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{ |
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unsigned long flags; |
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struct snd_mpu401 *mpu; |
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int max = 64; |
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mpu = substream->rmidi->private_data; |
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if (up) { |
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if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER, |
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&mpu->mode)) { |
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/* first time - flush FIFO */ |
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while (max-- > 0) |
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mpu->read(mpu, MPU401D(mpu)); |
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if (mpu->info_flags & MPU401_INFO_USE_TIMER) |
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snd_mpu401_uart_add_timer(mpu, 1); |
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} |
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/* read data in advance */ |
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spin_lock_irqsave(&mpu->input_lock, flags); |
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snd_mpu401_uart_input_read(mpu); |
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spin_unlock_irqrestore(&mpu->input_lock, flags); |
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} else { |
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if (mpu->info_flags & MPU401_INFO_USE_TIMER) |
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snd_mpu401_uart_remove_timer(mpu, 1); |
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clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode); |
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} |
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} |
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/* |
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* transfer input pending data |
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* call with input_lock spinlock held |
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*/ |
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static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu) |
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{ |
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int max = 128; |
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unsigned char byte; |
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while (max-- > 0) { |
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if (! snd_mpu401_input_avail(mpu)) |
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break; /* input not available */ |
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byte = mpu->read(mpu, MPU401D(mpu)); |
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if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode)) |
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snd_rawmidi_receive(mpu->substream_input, &byte, 1); |
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} |
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} |
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/* |
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* Tx FIFO sizes: |
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* CS4237B - 16 bytes |
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* AudioDrive ES1688 - 12 bytes |
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* S3 SonicVibes - 8 bytes |
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* SoundBlaster AWE 64 - 2 bytes (ugly hardware) |
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*/ |
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/* |
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* write output pending bytes |
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* call with output_lock spinlock held |
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*/ |
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static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu) |
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{ |
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unsigned char byte; |
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int max = 256; |
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do { |
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if (snd_rawmidi_transmit_peek(mpu->substream_output, |
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&byte, 1) == 1) { |
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/* |
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* Try twice because there is hardware that insists on |
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* setting the output busy bit after each write. |
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*/ |
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if (!snd_mpu401_output_ready(mpu) && |
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!snd_mpu401_output_ready(mpu)) |
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break; /* Tx FIFO full - try again later */ |
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mpu->write(mpu, byte, MPU401D(mpu)); |
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snd_rawmidi_transmit_ack(mpu->substream_output, 1); |
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} else { |
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snd_mpu401_uart_remove_timer (mpu, 0); |
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break; /* no other data - leave the tx loop */ |
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} |
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} while (--max > 0); |
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} |
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/* |
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* output trigger callback |
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*/ |
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static void |
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snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up) |
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{ |
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unsigned long flags; |
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struct snd_mpu401 *mpu; |
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mpu = substream->rmidi->private_data; |
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if (up) { |
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set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode); |
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|
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/* try to add the timer at each output trigger, |
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* since the output timer might have been removed in |
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* snd_mpu401_uart_output_write(). |
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*/ |
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if (! (mpu->info_flags & MPU401_INFO_TX_IRQ)) |
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snd_mpu401_uart_add_timer(mpu, 0); |
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|
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/* output pending data */ |
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spin_lock_irqsave(&mpu->output_lock, flags); |
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snd_mpu401_uart_output_write(mpu); |
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spin_unlock_irqrestore(&mpu->output_lock, flags); |
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} else { |
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if (! (mpu->info_flags & MPU401_INFO_TX_IRQ)) |
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snd_mpu401_uart_remove_timer(mpu, 0); |
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clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode); |
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} |
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} |
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/* |
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*/ |
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static const struct snd_rawmidi_ops snd_mpu401_uart_output = |
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{ |
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.open = snd_mpu401_uart_output_open, |
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.close = snd_mpu401_uart_output_close, |
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.trigger = snd_mpu401_uart_output_trigger, |
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}; |
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static const struct snd_rawmidi_ops snd_mpu401_uart_input = |
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{ |
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.open = snd_mpu401_uart_input_open, |
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.close = snd_mpu401_uart_input_close, |
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.trigger = snd_mpu401_uart_input_trigger, |
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}; |
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static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi) |
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{ |
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struct snd_mpu401 *mpu = rmidi->private_data; |
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if (mpu->irq >= 0) |
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free_irq(mpu->irq, (void *) mpu); |
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release_and_free_resource(mpu->res); |
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kfree(mpu); |
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} |
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|
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/** |
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* snd_mpu401_uart_new - create an MPU401-UART instance |
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* @card: the card instance |
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* @device: the device index, zero-based |
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* @hardware: the hardware type, MPU401_HW_XXXX |
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* @port: the base address of MPU401 port |
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* @info_flags: bitflags MPU401_INFO_XXX |
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* @irq: the ISA irq number, -1 if not to be allocated |
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* @rrawmidi: the pointer to store the new rawmidi instance |
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* |
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* Creates a new MPU-401 instance. |
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* |
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* Note that the rawmidi instance is returned on the rrawmidi argument, |
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* not the mpu401 instance itself. To access to the mpu401 instance, |
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* cast from rawmidi->private_data (with struct snd_mpu401 magic-cast). |
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* |
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* Return: Zero if successful, or a negative error code. |
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*/ |
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int snd_mpu401_uart_new(struct snd_card *card, int device, |
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unsigned short hardware, |
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unsigned long port, |
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unsigned int info_flags, |
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int irq, |
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struct snd_rawmidi ** rrawmidi) |
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{ |
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struct snd_mpu401 *mpu; |
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struct snd_rawmidi *rmidi; |
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int in_enable, out_enable; |
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int err; |
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if (rrawmidi) |
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*rrawmidi = NULL; |
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if (! (info_flags & (MPU401_INFO_INPUT | MPU401_INFO_OUTPUT))) |
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info_flags |= MPU401_INFO_INPUT | MPU401_INFO_OUTPUT; |
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in_enable = (info_flags & MPU401_INFO_INPUT) ? 1 : 0; |
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out_enable = (info_flags & MPU401_INFO_OUTPUT) ? 1 : 0; |
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if ((err = snd_rawmidi_new(card, "MPU-401U", device, |
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out_enable, in_enable, &rmidi)) < 0) |
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return err; |
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mpu = kzalloc(sizeof(*mpu), GFP_KERNEL); |
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if (!mpu) { |
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err = -ENOMEM; |
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goto free_device; |
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} |
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rmidi->private_data = mpu; |
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rmidi->private_free = snd_mpu401_uart_free; |
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spin_lock_init(&mpu->input_lock); |
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spin_lock_init(&mpu->output_lock); |
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spin_lock_init(&mpu->timer_lock); |
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mpu->hardware = hardware; |
|
mpu->irq = -1; |
|
if (! (info_flags & MPU401_INFO_INTEGRATED)) { |
|
int res_size = hardware == MPU401_HW_PC98II ? 4 : 2; |
|
mpu->res = request_region(port, res_size, "MPU401 UART"); |
|
if (!mpu->res) { |
|
snd_printk(KERN_ERR "mpu401_uart: " |
|
"unable to grab port 0x%lx size %d\n", |
|
port, res_size); |
|
err = -EBUSY; |
|
goto free_device; |
|
} |
|
} |
|
if (info_flags & MPU401_INFO_MMIO) { |
|
mpu->write = mpu401_write_mmio; |
|
mpu->read = mpu401_read_mmio; |
|
} else { |
|
mpu->write = mpu401_write_port; |
|
mpu->read = mpu401_read_port; |
|
} |
|
mpu->port = port; |
|
if (hardware == MPU401_HW_PC98II) |
|
mpu->cport = port + 2; |
|
else |
|
mpu->cport = port + 1; |
|
if (irq >= 0) { |
|
if (request_irq(irq, snd_mpu401_uart_interrupt, 0, |
|
"MPU401 UART", (void *) mpu)) { |
|
snd_printk(KERN_ERR "mpu401_uart: " |
|
"unable to grab IRQ %d\n", irq); |
|
err = -EBUSY; |
|
goto free_device; |
|
} |
|
} |
|
if (irq < 0 && !(info_flags & MPU401_INFO_IRQ_HOOK)) |
|
info_flags |= MPU401_INFO_USE_TIMER; |
|
mpu->info_flags = info_flags; |
|
mpu->irq = irq; |
|
if (card->shortname[0]) |
|
snprintf(rmidi->name, sizeof(rmidi->name), "%s MIDI", |
|
card->shortname); |
|
else |
|
sprintf(rmidi->name, "MPU-401 MIDI %d-%d",card->number, device); |
|
if (out_enable) { |
|
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_OUTPUT, |
|
&snd_mpu401_uart_output); |
|
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_OUTPUT; |
|
} |
|
if (in_enable) { |
|
snd_rawmidi_set_ops(rmidi, SNDRV_RAWMIDI_STREAM_INPUT, |
|
&snd_mpu401_uart_input); |
|
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_INPUT; |
|
if (out_enable) |
|
rmidi->info_flags |= SNDRV_RAWMIDI_INFO_DUPLEX; |
|
} |
|
mpu->rmidi = rmidi; |
|
if (rrawmidi) |
|
*rrawmidi = rmidi; |
|
return 0; |
|
free_device: |
|
snd_device_free(card, rmidi); |
|
return err; |
|
} |
|
|
|
EXPORT_SYMBOL(snd_mpu401_uart_new);
|
|
|