252 lines
6.3 KiB
C
252 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Driver for generic MPU-401 boards (UART mode only)
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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* Copyright (c) 2004 by Castet Matthieu <castet.matthieu@free.fr>
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*/
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#include <linux/init.h>
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#include <linux/pnp.h>
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#include <linux/err.h>
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#include <linux/platform_device.h>
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#include <linux/module.h>
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#include <sound/core.h>
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#include <sound/mpu401.h>
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#include <sound/initval.h>
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MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
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MODULE_DESCRIPTION("MPU-401 UART");
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MODULE_LICENSE("GPL");
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static int index[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = -2}; /* exclude the first card */
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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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#ifdef CONFIG_PNP
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static bool pnp[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
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#endif
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static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT; /* MPU-401 port number */
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static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ; /* MPU-401 IRQ */
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static bool uart_enter[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
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module_param_array(index, int, NULL, 0444);
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MODULE_PARM_DESC(index, "Index value for MPU-401 device.");
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module_param_array(id, charp, NULL, 0444);
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MODULE_PARM_DESC(id, "ID string for MPU-401 device.");
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module_param_array(enable, bool, NULL, 0444);
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MODULE_PARM_DESC(enable, "Enable MPU-401 device.");
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#ifdef CONFIG_PNP
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module_param_array(pnp, bool, NULL, 0444);
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MODULE_PARM_DESC(pnp, "PnP detection for MPU-401 device.");
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#endif
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module_param_hw_array(port, long, ioport, NULL, 0444);
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MODULE_PARM_DESC(port, "Port # for MPU-401 device.");
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module_param_hw_array(irq, int, irq, NULL, 0444);
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MODULE_PARM_DESC(irq, "IRQ # for MPU-401 device.");
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module_param_array(uart_enter, bool, NULL, 0444);
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MODULE_PARM_DESC(uart_enter, "Issue UART_ENTER command at open.");
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static struct platform_device *platform_devices[SNDRV_CARDS];
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static int pnp_registered;
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static unsigned int snd_mpu401_devices;
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static int snd_mpu401_create(struct device *devptr, int dev,
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struct snd_card **rcard)
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{
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struct snd_card *card;
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int err;
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if (!uart_enter[dev])
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snd_printk(KERN_ERR "the uart_enter option is obsolete; remove it\n");
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*rcard = NULL;
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err = snd_devm_card_new(devptr, index[dev], id[dev], THIS_MODULE,
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0, &card);
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if (err < 0)
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return err;
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strcpy(card->driver, "MPU-401 UART");
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strcpy(card->shortname, card->driver);
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sprintf(card->longname, "%s at %#lx, ", card->shortname, port[dev]);
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if (irq[dev] >= 0) {
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sprintf(card->longname + strlen(card->longname), "irq %d", irq[dev]);
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} else {
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strcat(card->longname, "polled");
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}
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err = snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401, port[dev], 0,
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irq[dev], NULL);
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if (err < 0) {
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printk(KERN_ERR "MPU401 not detected at 0x%lx\n", port[dev]);
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return err;
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}
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*rcard = card;
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return 0;
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}
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static int snd_mpu401_probe(struct platform_device *devptr)
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{
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int dev = devptr->id;
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int err;
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struct snd_card *card;
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if (port[dev] == SNDRV_AUTO_PORT) {
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snd_printk(KERN_ERR "specify port\n");
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return -EINVAL;
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}
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if (irq[dev] == SNDRV_AUTO_IRQ) {
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snd_printk(KERN_ERR "specify or disable IRQ\n");
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return -EINVAL;
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}
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err = snd_mpu401_create(&devptr->dev, dev, &card);
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if (err < 0)
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return err;
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err = snd_card_register(card);
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if (err < 0)
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return err;
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platform_set_drvdata(devptr, card);
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return 0;
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}
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#define SND_MPU401_DRIVER "snd_mpu401"
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static struct platform_driver snd_mpu401_driver = {
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.probe = snd_mpu401_probe,
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.driver = {
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.name = SND_MPU401_DRIVER,
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},
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};
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#ifdef CONFIG_PNP
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#define IO_EXTENT 2
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static const struct pnp_device_id snd_mpu401_pnpids[] = {
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{ .id = "PNPb006" },
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{ .id = "" }
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};
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MODULE_DEVICE_TABLE(pnp, snd_mpu401_pnpids);
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static int snd_mpu401_pnp(int dev, struct pnp_dev *device,
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const struct pnp_device_id *id)
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{
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if (!pnp_port_valid(device, 0) ||
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pnp_port_flags(device, 0) & IORESOURCE_DISABLED) {
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snd_printk(KERN_ERR "no PnP port\n");
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return -ENODEV;
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}
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if (pnp_port_len(device, 0) < IO_EXTENT) {
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snd_printk(KERN_ERR "PnP port length is %llu, expected %d\n",
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(unsigned long long)pnp_port_len(device, 0),
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IO_EXTENT);
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return -ENODEV;
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}
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port[dev] = pnp_port_start(device, 0);
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if (!pnp_irq_valid(device, 0) ||
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pnp_irq_flags(device, 0) & IORESOURCE_DISABLED) {
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snd_printk(KERN_WARNING "no PnP irq, using polling\n");
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irq[dev] = -1;
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} else {
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irq[dev] = pnp_irq(device, 0);
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}
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return 0;
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}
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static int snd_mpu401_pnp_probe(struct pnp_dev *pnp_dev,
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const struct pnp_device_id *id)
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{
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static int dev;
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struct snd_card *card;
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int err;
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for ( ; dev < SNDRV_CARDS; ++dev) {
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if (!enable[dev] || !pnp[dev])
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continue;
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err = snd_mpu401_pnp(dev, pnp_dev, id);
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if (err < 0)
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return err;
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err = snd_mpu401_create(&pnp_dev->dev, dev, &card);
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if (err < 0)
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return err;
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err = snd_card_register(card);
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if (err < 0)
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return err;
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pnp_set_drvdata(pnp_dev, card);
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snd_mpu401_devices++;
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++dev;
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return 0;
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}
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return -ENODEV;
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}
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static struct pnp_driver snd_mpu401_pnp_driver = {
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.name = "mpu401",
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.id_table = snd_mpu401_pnpids,
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.probe = snd_mpu401_pnp_probe,
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};
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#else
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static struct pnp_driver snd_mpu401_pnp_driver;
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#endif
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static void snd_mpu401_unregister_all(void)
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{
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int i;
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if (pnp_registered)
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pnp_unregister_driver(&snd_mpu401_pnp_driver);
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for (i = 0; i < ARRAY_SIZE(platform_devices); ++i)
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platform_device_unregister(platform_devices[i]);
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platform_driver_unregister(&snd_mpu401_driver);
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}
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static int __init alsa_card_mpu401_init(void)
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{
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int i, err;
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err = platform_driver_register(&snd_mpu401_driver);
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if (err < 0)
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return err;
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for (i = 0; i < SNDRV_CARDS; i++) {
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struct platform_device *device;
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if (! enable[i])
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continue;
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#ifdef CONFIG_PNP
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if (pnp[i])
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continue;
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#endif
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device = platform_device_register_simple(SND_MPU401_DRIVER,
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i, NULL, 0);
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if (IS_ERR(device))
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continue;
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if (!platform_get_drvdata(device)) {
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platform_device_unregister(device);
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continue;
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}
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platform_devices[i] = device;
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snd_mpu401_devices++;
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}
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err = pnp_register_driver(&snd_mpu401_pnp_driver);
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if (!err)
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pnp_registered = 1;
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if (!snd_mpu401_devices) {
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#ifdef MODULE
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printk(KERN_ERR "MPU-401 device not found or device busy\n");
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#endif
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snd_mpu401_unregister_all();
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return -ENODEV;
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}
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return 0;
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}
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static void __exit alsa_card_mpu401_exit(void)
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{
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snd_mpu401_unregister_all();
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}
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module_init(alsa_card_mpu401_init)
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module_exit(alsa_card_mpu401_exit)
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