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-rw-r--r--sound/drivers/mpu401/Makefile13
-rw-r--r--sound/drivers/mpu401/mpu401.c251
-rw-r--r--sound/drivers/mpu401/mpu401_uart.c611
3 files changed, 875 insertions, 0 deletions
diff --git a/sound/drivers/mpu401/Makefile b/sound/drivers/mpu401/Makefile
new file mode 100644
index 000000000..3dfd5b374
--- /dev/null
+++ b/sound/drivers/mpu401/Makefile
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# 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/sound/drivers/mpu401/mpu401.c b/sound/drivers/mpu401/mpu401.c
new file mode 100644
index 000000000..3398aee33
--- /dev/null
+++ b/sound/drivers/mpu401/mpu401.c
@@ -0,0 +1,251 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * 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>
+ */
+
+#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_hw_array(port, long, ioport, NULL, 0444);
+MODULE_PARM_DESC(port, "Port # for MPU-401 device.");
+module_param_hw_array(irq, int, irq, 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_devm_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]);
+ return err;
+ }
+
+ *rcard = card;
+ return 0;
+}
+
+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;
+ err = snd_card_register(card);
+ if (err < 0)
+ return err;
+ platform_set_drvdata(devptr, card);
+ return 0;
+}
+
+#define SND_MPU401_DRIVER "snd_mpu401"
+
+static struct platform_driver snd_mpu401_driver = {
+ .probe = snd_mpu401_probe,
+ .driver = {
+ .name = SND_MPU401_DRIVER,
+ },
+};
+
+
+#ifdef CONFIG_PNP
+
+#define IO_EXTENT 2
+
+static const 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;
+ err = snd_card_register(card);
+ if (err < 0)
+ return err;
+ pnp_set_drvdata(pnp_dev, card);
+ snd_mpu401_devices++;
+ ++dev;
+ return 0;
+ }
+ return -ENODEV;
+}
+
+static struct pnp_driver snd_mpu401_pnp_driver = {
+ .name = "mpu401",
+ .id_table = snd_mpu401_pnpids,
+ .probe = snd_mpu401_pnp_probe,
+};
+#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;
+
+ err = platform_driver_register(&snd_mpu401_driver);
+ if (err < 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/sound/drivers/mpu401/mpu401_uart.c b/sound/drivers/mpu401/mpu401_uart.c
new file mode 100644
index 000000000..f435b9b4a
--- /dev/null
+++ b/sound/drivers/mpu401/mpu401_uart.c
@@ -0,0 +1,611 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * 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.
+ *
+ * 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)
+ 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)
+ 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(struct timer_list *t)
+{
+ struct snd_mpu401 *mpu = from_timer(mpu, t, timer);
+ 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) {
+ timer_setup(&mpu->timer, snd_mpu401_uart_timer, 0);
+ 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);
+ if (err < 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);
+ if (err < 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 const 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 const 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;
+ err = snd_rawmidi_new(card, "MPU-401U", device,
+ out_enable, in_enable, &rmidi);
+ if (err < 0)
+ return err;
+ mpu = kzalloc(sizeof(*mpu), GFP_KERNEL);
+ if (!mpu) {
+ err = -ENOMEM;
+ goto free_device;
+ }
+ 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) {
+ 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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-13 11:02:25 +0000