diff options
Diffstat (limited to 'kernel/sound/drivers/mpu401')
| -rw-r--r-- | kernel/sound/drivers/mpu401/Makefile | 12 | ||||
| -rw-r--r-- | kernel/sound/drivers/mpu401/mpu401.c | 287 | ||||
| -rw-r--r-- | kernel/sound/drivers/mpu401/mpu401_uart.c | 634 |
3 files changed, 933 insertions, 0 deletions
diff --git a/kernel/sound/drivers/mpu401/Makefile b/kernel/sound/drivers/mpu401/Makefile new file mode 100644 index 000000000..918f83f34 --- /dev/null +++ b/kernel/sound/drivers/mpu401/Makefile @@ -0,0 +1,12 @@ +# +# Makefile for ALSA +# Copyright (c) 2001 by Jaroslav Kysela <perex@perex.cz> +# + +snd-mpu401-objs := mpu401.o +snd-mpu401-uart-objs := mpu401_uart.o + +obj-$(CONFIG_SND_MPU401_UART) += snd-mpu401-uart.o + +# Toplevel Module Dependency +obj-$(CONFIG_SND_MPU401) += snd-mpu401.o diff --git a/kernel/sound/drivers/mpu401/mpu401.c b/kernel/sound/drivers/mpu401/mpu401.c new file mode 100644 index 000000000..fed7e7e21 --- /dev/null +++ b/kernel/sound/drivers/mpu401/mpu401.c @@ -0,0 +1,287 @@ +/* + * Driver for generic MPU-401 boards (UART mode only) + * Copyright (c) by Jaroslav Kysela <perex@perex.cz> + * Copyright (c) 2004 by Castet Matthieu <castet.matthieu@free.fr> + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <linux/init.h> +#include <linux/pnp.h> +#include <linux/err.h> +#include <linux/platform_device.h> +#include <linux/module.h> +#include <sound/core.h> +#include <sound/mpu401.h> +#include <sound/initval.h> + +MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); +MODULE_DESCRIPTION("MPU-401 UART"); +MODULE_LICENSE("GPL"); + +static int index[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = -2}; /* exclude the first card */ +static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */ +static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; /* Enable this card */ +#ifdef CONFIG_PNP +static bool pnp[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; +#endif +static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT; /* MPU-401 port number */ +static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ; /* MPU-401 IRQ */ +static bool uart_enter[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1}; + +module_param_array(index, int, NULL, 0444); +MODULE_PARM_DESC(index, "Index value for MPU-401 device."); +module_param_array(id, charp, NULL, 0444); +MODULE_PARM_DESC(id, "ID string for MPU-401 device."); +module_param_array(enable, bool, NULL, 0444); +MODULE_PARM_DESC(enable, "Enable MPU-401 device."); +#ifdef CONFIG_PNP +module_param_array(pnp, bool, NULL, 0444); +MODULE_PARM_DESC(pnp, "PnP detection for MPU-401 device."); +#endif +module_param_array(port, long, NULL, 0444); +MODULE_PARM_DESC(port, "Port # for MPU-401 device."); +module_param_array(irq, int, NULL, 0444); +MODULE_PARM_DESC(irq, "IRQ # for MPU-401 device."); +module_param_array(uart_enter, bool, NULL, 0444); +MODULE_PARM_DESC(uart_enter, "Issue UART_ENTER command at open."); + +static struct platform_device *platform_devices[SNDRV_CARDS]; +static int pnp_registered; +static unsigned int snd_mpu401_devices; + +static int snd_mpu401_create(struct device *devptr, int dev, + struct snd_card **rcard) +{ + struct snd_card *card; + int err; + + if (!uart_enter[dev]) + snd_printk(KERN_ERR "the uart_enter option is obsolete; remove it\n"); + + *rcard = NULL; + err = snd_card_new(devptr, index[dev], id[dev], THIS_MODULE, + 0, &card); + if (err < 0) + return err; + strcpy(card->driver, "MPU-401 UART"); + strcpy(card->shortname, card->driver); + sprintf(card->longname, "%s at %#lx, ", card->shortname, port[dev]); + if (irq[dev] >= 0) { + sprintf(card->longname + strlen(card->longname), "irq %d", irq[dev]); + } else { + strcat(card->longname, "polled"); + } + + err = snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401, port[dev], 0, + irq[dev], NULL); + if (err < 0) { + printk(KERN_ERR "MPU401 not detected at 0x%lx\n", port[dev]); + goto _err; + } + + *rcard = card; + return 0; + + _err: + snd_card_free(card); + return err; +} + +static int snd_mpu401_probe(struct platform_device *devptr) +{ + int dev = devptr->id; + int err; + struct snd_card *card; + + if (port[dev] == SNDRV_AUTO_PORT) { + snd_printk(KERN_ERR "specify port\n"); + return -EINVAL; + } + if (irq[dev] == SNDRV_AUTO_IRQ) { + snd_printk(KERN_ERR "specify or disable IRQ\n"); + return -EINVAL; + } + err = snd_mpu401_create(&devptr->dev, dev, &card); + if (err < 0) + return err; + if ((err = snd_card_register(card)) < 0) { + snd_card_free(card); + return err; + } + platform_set_drvdata(devptr, card); + return 0; +} + +static int snd_mpu401_remove(struct platform_device *devptr) +{ + snd_card_free(platform_get_drvdata(devptr)); + return 0; +} + +#define SND_MPU401_DRIVER "snd_mpu401" + +static struct platform_driver snd_mpu401_driver = { + .probe = snd_mpu401_probe, + .remove = snd_mpu401_remove, + .driver = { + .name = SND_MPU401_DRIVER, + }, +}; + + +#ifdef CONFIG_PNP + +#define IO_EXTENT 2 + +static struct pnp_device_id snd_mpu401_pnpids[] = { + { .id = "PNPb006" }, + { .id = "" } +}; + +MODULE_DEVICE_TABLE(pnp, snd_mpu401_pnpids); + +static int snd_mpu401_pnp(int dev, struct pnp_dev *device, + const struct pnp_device_id *id) +{ + if (!pnp_port_valid(device, 0) || + pnp_port_flags(device, 0) & IORESOURCE_DISABLED) { + snd_printk(KERN_ERR "no PnP port\n"); + return -ENODEV; + } + if (pnp_port_len(device, 0) < IO_EXTENT) { + snd_printk(KERN_ERR "PnP port length is %llu, expected %d\n", + (unsigned long long)pnp_port_len(device, 0), + IO_EXTENT); + return -ENODEV; + } + port[dev] = pnp_port_start(device, 0); + + if (!pnp_irq_valid(device, 0) || + pnp_irq_flags(device, 0) & IORESOURCE_DISABLED) { + snd_printk(KERN_WARNING "no PnP irq, using polling\n"); + irq[dev] = -1; + } else { + irq[dev] = pnp_irq(device, 0); + } + return 0; +} + +static int snd_mpu401_pnp_probe(struct pnp_dev *pnp_dev, + const struct pnp_device_id *id) +{ + static int dev; + struct snd_card *card; + int err; + + for ( ; dev < SNDRV_CARDS; ++dev) { + if (!enable[dev] || !pnp[dev]) + continue; + err = snd_mpu401_pnp(dev, pnp_dev, id); + if (err < 0) + return err; + err = snd_mpu401_create(&pnp_dev->dev, dev, &card); + if (err < 0) + return err; + if ((err = snd_card_register(card)) < 0) { + snd_card_free(card); + return err; + } + pnp_set_drvdata(pnp_dev, card); + snd_mpu401_devices++; + ++dev; + return 0; + } + return -ENODEV; +} + +static void snd_mpu401_pnp_remove(struct pnp_dev *dev) +{ + struct snd_card *card = (struct snd_card *) pnp_get_drvdata(dev); + + snd_card_disconnect(card); + snd_card_free_when_closed(card); +} + +static struct pnp_driver snd_mpu401_pnp_driver = { + .name = "mpu401", + .id_table = snd_mpu401_pnpids, + .probe = snd_mpu401_pnp_probe, + .remove = snd_mpu401_pnp_remove, +}; +#else +static struct pnp_driver snd_mpu401_pnp_driver; +#endif + +static void snd_mpu401_unregister_all(void) +{ + int i; + + if (pnp_registered) + pnp_unregister_driver(&snd_mpu401_pnp_driver); + for (i = 0; i < ARRAY_SIZE(platform_devices); ++i) + platform_device_unregister(platform_devices[i]); + platform_driver_unregister(&snd_mpu401_driver); +} + +static int __init alsa_card_mpu401_init(void) +{ + int i, err; + + if ((err = platform_driver_register(&snd_mpu401_driver)) < 0) + return err; + + for (i = 0; i < SNDRV_CARDS; i++) { + struct platform_device *device; + if (! enable[i]) + continue; +#ifdef CONFIG_PNP + if (pnp[i]) + continue; +#endif + device = platform_device_register_simple(SND_MPU401_DRIVER, + i, NULL, 0); + if (IS_ERR(device)) + continue; + if (!platform_get_drvdata(device)) { + platform_device_unregister(device); + continue; + } + platform_devices[i] = device; + snd_mpu401_devices++; + } + err = pnp_register_driver(&snd_mpu401_pnp_driver); + if (!err) + pnp_registered = 1; + + if (!snd_mpu401_devices) { +#ifdef MODULE + printk(KERN_ERR "MPU-401 device not found or device busy\n"); +#endif + snd_mpu401_unregister_all(); + return -ENODEV; + } + return 0; +} + +static void __exit alsa_card_mpu401_exit(void) +{ + snd_mpu401_unregister_all(); +} + +module_init(alsa_card_mpu401_init) +module_exit(alsa_card_mpu401_exit) diff --git a/kernel/sound/drivers/mpu401/mpu401_uart.c b/kernel/sound/drivers/mpu401/mpu401_uart.c new file mode 100644 index 000000000..776596b5e --- /dev/null +++ b/kernel/sound/drivers/mpu401/mpu401_uart.c @@ -0,0 +1,634 @@ +/* + * Copyright (c) by Jaroslav Kysela <perex@perex.cz> + * Routines for control of MPU-401 in UART mode + * + * MPU-401 supports UART mode which is not capable generate transmit + * interrupts thus output is done via polling. Without interrupt, + * input is done also via polling. Do not expect good performance. + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * 13-03-2003: + * Added support for different kind of hardware I/O. Build in choices + * are port and mmio. For other kind of I/O, set mpu->read and + * mpu->write to your own I/O functions. + * + */ + +#include <linux/io.h> +#include <linux/delay.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/ioport.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/errno.h> +#include <sound/core.h> +#include <sound/mpu401.h> + +MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>"); +MODULE_DESCRIPTION("Routines for control of MPU-401 in UART mode"); +MODULE_LICENSE("GPL"); + +static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu); +static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu); + +/* + + */ + +#define snd_mpu401_input_avail(mpu) \ + (!(mpu->read(mpu, MPU401C(mpu)) & MPU401_RX_EMPTY)) +#define snd_mpu401_output_ready(mpu) \ + (!(mpu->read(mpu, MPU401C(mpu)) & MPU401_TX_FULL)) + +/* Build in lowlevel io */ +static void mpu401_write_port(struct snd_mpu401 *mpu, unsigned char data, + unsigned long addr) +{ + outb(data, addr); +} + +static unsigned char mpu401_read_port(struct snd_mpu401 *mpu, + unsigned long addr) +{ + return inb(addr); +} + +static void mpu401_write_mmio(struct snd_mpu401 *mpu, unsigned char data, + unsigned long addr) +{ + writeb(data, (void __iomem *)addr); +} + +static unsigned char mpu401_read_mmio(struct snd_mpu401 *mpu, + unsigned long addr) +{ + return readb((void __iomem *)addr); +} +/* */ + +static void snd_mpu401_uart_clear_rx(struct snd_mpu401 *mpu) +{ + int timeout = 100000; + for (; timeout > 0 && snd_mpu401_input_avail(mpu); timeout--) + mpu->read(mpu, MPU401D(mpu)); +#ifdef CONFIG_SND_DEBUG + if (timeout <= 0) + snd_printk(KERN_ERR "cmd: clear rx timeout (status = 0x%x)\n", + mpu->read(mpu, MPU401C(mpu))); +#endif +} + +static void uart_interrupt_tx(struct snd_mpu401 *mpu) +{ + unsigned long flags; + + if (test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode) && + test_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode)) { + spin_lock_irqsave(&mpu->output_lock, flags); + snd_mpu401_uart_output_write(mpu); + spin_unlock_irqrestore(&mpu->output_lock, flags); + } +} + +static void _snd_mpu401_uart_interrupt(struct snd_mpu401 *mpu) +{ + unsigned long flags; + + if (mpu->info_flags & MPU401_INFO_INPUT) { + spin_lock_irqsave(&mpu->input_lock, flags); + if (test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) + snd_mpu401_uart_input_read(mpu); + else + snd_mpu401_uart_clear_rx(mpu); + spin_unlock_irqrestore(&mpu->input_lock, flags); + } + if (! (mpu->info_flags & MPU401_INFO_TX_IRQ)) + /* ok. for better Tx performance try do some output + when input is done */ + uart_interrupt_tx(mpu); +} + +/** + * snd_mpu401_uart_interrupt - generic MPU401-UART interrupt handler + * @irq: the irq number + * @dev_id: mpu401 instance + * + * Processes the interrupt for MPU401-UART i/o. + * + * Return: %IRQ_HANDLED if the interrupt was handled. %IRQ_NONE otherwise. + */ +irqreturn_t snd_mpu401_uart_interrupt(int irq, void *dev_id) +{ + struct snd_mpu401 *mpu = dev_id; + + if (mpu == NULL) + return IRQ_NONE; + _snd_mpu401_uart_interrupt(mpu); + return IRQ_HANDLED; +} + +EXPORT_SYMBOL(snd_mpu401_uart_interrupt); + +/** + * snd_mpu401_uart_interrupt_tx - generic MPU401-UART transmit irq handler + * @irq: the irq number + * @dev_id: mpu401 instance + * + * Processes the interrupt for MPU401-UART output. + * + * Return: %IRQ_HANDLED if the interrupt was handled. %IRQ_NONE otherwise. + */ +irqreturn_t snd_mpu401_uart_interrupt_tx(int irq, void *dev_id) +{ + struct snd_mpu401 *mpu = dev_id; + + if (mpu == NULL) + return IRQ_NONE; + uart_interrupt_tx(mpu); + return IRQ_HANDLED; +} + +EXPORT_SYMBOL(snd_mpu401_uart_interrupt_tx); + +/* + * timer callback + * reprogram the timer and call the interrupt job + */ +static void snd_mpu401_uart_timer(unsigned long data) +{ + struct snd_mpu401 *mpu = (struct snd_mpu401 *)data; + unsigned long flags; + + spin_lock_irqsave(&mpu->timer_lock, flags); + /*mpu->mode |= MPU401_MODE_TIMER;*/ + mod_timer(&mpu->timer, 1 + jiffies); + spin_unlock_irqrestore(&mpu->timer_lock, flags); + if (mpu->rmidi) + _snd_mpu401_uart_interrupt(mpu); +} + +/* + * initialize the timer callback if not programmed yet + */ +static void snd_mpu401_uart_add_timer (struct snd_mpu401 *mpu, int input) +{ + unsigned long flags; + + spin_lock_irqsave (&mpu->timer_lock, flags); + if (mpu->timer_invoked == 0) { + setup_timer(&mpu->timer, snd_mpu401_uart_timer, + (unsigned long)mpu); + mod_timer(&mpu->timer, 1 + jiffies); + } + mpu->timer_invoked |= input ? MPU401_MODE_INPUT_TIMER : + MPU401_MODE_OUTPUT_TIMER; + spin_unlock_irqrestore (&mpu->timer_lock, flags); +} + +/* + * remove the timer callback if still active + */ +static void snd_mpu401_uart_remove_timer (struct snd_mpu401 *mpu, int input) +{ + unsigned long flags; + + spin_lock_irqsave (&mpu->timer_lock, flags); + if (mpu->timer_invoked) { + mpu->timer_invoked &= input ? ~MPU401_MODE_INPUT_TIMER : + ~MPU401_MODE_OUTPUT_TIMER; + if (! mpu->timer_invoked) + del_timer(&mpu->timer); + } + spin_unlock_irqrestore (&mpu->timer_lock, flags); +} + +/* + * send a UART command + * return zero if successful, non-zero for some errors + */ + +static int snd_mpu401_uart_cmd(struct snd_mpu401 * mpu, unsigned char cmd, + int ack) +{ + unsigned long flags; + int timeout, ok; + + spin_lock_irqsave(&mpu->input_lock, flags); + if (mpu->hardware != MPU401_HW_TRID4DWAVE) { + mpu->write(mpu, 0x00, MPU401D(mpu)); + /*snd_mpu401_uart_clear_rx(mpu);*/ + } + /* ok. standard MPU-401 initialization */ + if (mpu->hardware != MPU401_HW_SB) { + for (timeout = 1000; timeout > 0 && + !snd_mpu401_output_ready(mpu); timeout--) + udelay(10); +#ifdef CONFIG_SND_DEBUG + if (!timeout) + snd_printk(KERN_ERR "cmd: tx timeout (status = 0x%x)\n", + mpu->read(mpu, MPU401C(mpu))); +#endif + } + mpu->write(mpu, cmd, MPU401C(mpu)); + if (ack && !(mpu->info_flags & MPU401_INFO_NO_ACK)) { + ok = 0; + timeout = 10000; + while (!ok && timeout-- > 0) { + if (snd_mpu401_input_avail(mpu)) { + if (mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK) + ok = 1; + } + } + if (!ok && mpu->read(mpu, MPU401D(mpu)) == MPU401_ACK) + ok = 1; + } else + ok = 1; + spin_unlock_irqrestore(&mpu->input_lock, flags); + if (!ok) { + snd_printk(KERN_ERR "cmd: 0x%x failed at 0x%lx " + "(status = 0x%x, data = 0x%x)\n", cmd, mpu->port, + mpu->read(mpu, MPU401C(mpu)), + mpu->read(mpu, MPU401D(mpu))); + return 1; + } + return 0; +} + +static int snd_mpu401_do_reset(struct snd_mpu401 *mpu) +{ + if (snd_mpu401_uart_cmd(mpu, MPU401_RESET, 1)) + return -EIO; + if (snd_mpu401_uart_cmd(mpu, MPU401_ENTER_UART, 0)) + return -EIO; + return 0; +} + +/* + * input/output open/close - protected by open_mutex in rawmidi.c + */ +static int snd_mpu401_uart_input_open(struct snd_rawmidi_substream *substream) +{ + struct snd_mpu401 *mpu; + int err; + + mpu = substream->rmidi->private_data; + if (mpu->open_input && (err = mpu->open_input(mpu)) < 0) + return err; + if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) { + if (snd_mpu401_do_reset(mpu) < 0) + goto error_out; + } + mpu->substream_input = substream; + set_bit(MPU401_MODE_BIT_INPUT, &mpu->mode); + return 0; + +error_out: + if (mpu->open_input && mpu->close_input) + mpu->close_input(mpu); + return -EIO; +} + +static int snd_mpu401_uart_output_open(struct snd_rawmidi_substream *substream) +{ + struct snd_mpu401 *mpu; + int err; + + mpu = substream->rmidi->private_data; + if (mpu->open_output && (err = mpu->open_output(mpu)) < 0) + return err; + if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) { + if (snd_mpu401_do_reset(mpu) < 0) + goto error_out; + } + mpu->substream_output = substream; + set_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode); + return 0; + +error_out: + if (mpu->open_output && mpu->close_output) + mpu->close_output(mpu); + return -EIO; +} + +static int snd_mpu401_uart_input_close(struct snd_rawmidi_substream *substream) +{ + struct snd_mpu401 *mpu; + int err = 0; + + mpu = substream->rmidi->private_data; + clear_bit(MPU401_MODE_BIT_INPUT, &mpu->mode); + mpu->substream_input = NULL; + if (! test_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode)) + err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0); + if (mpu->close_input) + mpu->close_input(mpu); + if (err) + return -EIO; + return 0; +} + +static int snd_mpu401_uart_output_close(struct snd_rawmidi_substream *substream) +{ + struct snd_mpu401 *mpu; + int err = 0; + + mpu = substream->rmidi->private_data; + clear_bit(MPU401_MODE_BIT_OUTPUT, &mpu->mode); + mpu->substream_output = NULL; + if (! test_bit(MPU401_MODE_BIT_INPUT, &mpu->mode)) + err = snd_mpu401_uart_cmd(mpu, MPU401_RESET, 0); + if (mpu->close_output) + mpu->close_output(mpu); + if (err) + return -EIO; + return 0; +} + +/* + * trigger input callback + */ +static void +snd_mpu401_uart_input_trigger(struct snd_rawmidi_substream *substream, int up) +{ + unsigned long flags; + struct snd_mpu401 *mpu; + int max = 64; + + mpu = substream->rmidi->private_data; + if (up) { + if (! test_and_set_bit(MPU401_MODE_BIT_INPUT_TRIGGER, + &mpu->mode)) { + /* first time - flush FIFO */ + while (max-- > 0) + mpu->read(mpu, MPU401D(mpu)); + if (mpu->info_flags & MPU401_INFO_USE_TIMER) + snd_mpu401_uart_add_timer(mpu, 1); + } + + /* read data in advance */ + spin_lock_irqsave(&mpu->input_lock, flags); + snd_mpu401_uart_input_read(mpu); + spin_unlock_irqrestore(&mpu->input_lock, flags); + } else { + if (mpu->info_flags & MPU401_INFO_USE_TIMER) + snd_mpu401_uart_remove_timer(mpu, 1); + clear_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode); + } + +} + +/* + * transfer input pending data + * call with input_lock spinlock held + */ +static void snd_mpu401_uart_input_read(struct snd_mpu401 * mpu) +{ + int max = 128; + unsigned char byte; + + while (max-- > 0) { + if (! snd_mpu401_input_avail(mpu)) + break; /* input not available */ + byte = mpu->read(mpu, MPU401D(mpu)); + if (test_bit(MPU401_MODE_BIT_INPUT_TRIGGER, &mpu->mode)) + snd_rawmidi_receive(mpu->substream_input, &byte, 1); + } +} + +/* + * Tx FIFO sizes: + * CS4237B - 16 bytes + * AudioDrive ES1688 - 12 bytes + * S3 SonicVibes - 8 bytes + * SoundBlaster AWE 64 - 2 bytes (ugly hardware) + */ + +/* + * write output pending bytes + * call with output_lock spinlock held + */ +static void snd_mpu401_uart_output_write(struct snd_mpu401 * mpu) +{ + unsigned char byte; + int max = 256; + + do { + if (snd_rawmidi_transmit_peek(mpu->substream_output, + &byte, 1) == 1) { + /* + * Try twice because there is hardware that insists on + * setting the output busy bit after each write. + */ + if (!snd_mpu401_output_ready(mpu) && + !snd_mpu401_output_ready(mpu)) + break; /* Tx FIFO full - try again later */ + mpu->write(mpu, byte, MPU401D(mpu)); + snd_rawmidi_transmit_ack(mpu->substream_output, 1); + } else { + snd_mpu401_uart_remove_timer (mpu, 0); + break; /* no other data - leave the tx loop */ + } + } while (--max > 0); +} + +/* + * output trigger callback + */ +static void +snd_mpu401_uart_output_trigger(struct snd_rawmidi_substream *substream, int up) +{ + unsigned long flags; + struct snd_mpu401 *mpu; + + mpu = substream->rmidi->private_data; + if (up) { + set_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode); + + /* try to add the timer at each output trigger, + * since the output timer might have been removed in + * snd_mpu401_uart_output_write(). + */ + if (! (mpu->info_flags & MPU401_INFO_TX_IRQ)) + snd_mpu401_uart_add_timer(mpu, 0); + + /* output pending data */ + spin_lock_irqsave(&mpu->output_lock, flags); + snd_mpu401_uart_output_write(mpu); + spin_unlock_irqrestore(&mpu->output_lock, flags); + } else { + if (! (mpu->info_flags & MPU401_INFO_TX_IRQ)) + snd_mpu401_uart_remove_timer(mpu, 0); + clear_bit(MPU401_MODE_BIT_OUTPUT_TRIGGER, &mpu->mode); + } +} + +/* + + */ + +static struct snd_rawmidi_ops snd_mpu401_uart_output = +{ + .open = snd_mpu401_uart_output_open, + .close = snd_mpu401_uart_output_close, + .trigger = snd_mpu401_uart_output_trigger, +}; + +static struct snd_rawmidi_ops snd_mpu401_uart_input = +{ + .open = snd_mpu401_uart_input_open, + .close = snd_mpu401_uart_input_close, + .trigger = snd_mpu401_uart_input_trigger, +}; + +static void snd_mpu401_uart_free(struct snd_rawmidi *rmidi) +{ + struct snd_mpu401 *mpu = rmidi->private_data; + if (mpu->irq >= 0) + free_irq(mpu->irq, (void *) mpu); + release_and_free_resource(mpu->res); + kfree(mpu); +} + +/** + * snd_mpu401_uart_new - create an MPU401-UART instance + * @card: the card instance + * @device: the device index, zero-based + * @hardware: the hardware type, MPU401_HW_XXXX + * @port: the base address of MPU401 port + * @info_flags: bitflags MPU401_INFO_XXX + * @irq: the ISA irq number, -1 if not to be allocated + * @rrawmidi: the pointer to store the new rawmidi instance + * + * Creates a new MPU-401 instance. + * + * Note that the rawmidi instance is returned on the rrawmidi argument, + * not the mpu401 instance itself. To access to the mpu401 instance, + * cast from rawmidi->private_data (with struct snd_mpu401 magic-cast). + * + * Return: Zero if successful, or a negative error code. + */ +int snd_mpu401_uart_new(struct snd_card *card, int device, + unsigned short hardware, + unsigned long port, + unsigned int info_flags, + int irq, + struct snd_rawmidi ** rrawmidi) +{ + struct snd_mpu401 *mpu; + struct snd_rawmidi *rmidi; + int in_enable, out_enable; + int err; + + if (rrawmidi) + *rrawmidi = NULL; + if (! (info_flags & (MPU401_INFO_INPUT | MPU401_INFO_OUTPUT))) + info_flags |= MPU401_INFO_INPUT | MPU401_INFO_OUTPUT; + in_enable = (info_flags & MPU401_INFO_INPUT) ? 1 : 0; + out_enable = (info_flags & MPU401_INFO_OUTPUT) ? 1 : 0; + if ((err = snd_rawmidi_new(card, "MPU-401U", device, + out_enable, in_enable, &rmidi)) < 0) + return err; + mpu = kzalloc(sizeof(*mpu), GFP_KERNEL); + if (mpu == NULL) { + snd_printk(KERN_ERR "mpu401_uart: cannot allocate\n"); + snd_device_free(card, rmidi); + return -ENOMEM; + } + rmidi->private_data = mpu; + rmidi->private_free = snd_mpu401_uart_free; + spin_lock_init(&mpu->input_lock); + spin_lock_init(&mpu->output_lock); + spin_lock_init(&mpu->timer_lock); + 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 == NULL) { + snd_printk(KERN_ERR "mpu401_uart: " + "unable to grab port 0x%lx size %d\n", + port, res_size); + snd_device_free(card, rmidi); + return -EBUSY; + } + } + 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); + snd_device_free(card, rmidi); + return -EBUSY; + } + } + 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; +} + +EXPORT_SYMBOL(snd_mpu401_uart_new); + +/* + * INIT part + */ + +static int __init alsa_mpu401_uart_init(void) +{ + return 0; +} + +static void __exit alsa_mpu401_uart_exit(void) +{ +} + +module_init(alsa_mpu401_uart_init) +module_exit(alsa_mpu401_uart_exit) |