// SPDX-License-Identifier: GPL-2.0-or-later /* * Driver for generic MPU-401 boards (UART mode only) * Copyright (c) by Jaroslav Kysela * Copyright (c) 2004 by Castet Matthieu */ #include #include #include #include #include #include #include #include MODULE_AUTHOR("Jaroslav Kysela "); 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struct snd_card **rcard) { struct snd_card *card; int err; if (!uart_enter[dev]) dev_err(devptr, "the uart_enter option is obsolete; remove it\n"); *rcard = NULL; err = snd_devm_card_new(devptr, index[dev], id[dev], THIS_MODULE, 0, &card); if (err 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) { dev_err(devptr, "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) { dev_err(&devptr->dev, "specify port\n"); return -EINVAL; } if (irq[dev] == SNDRV_AUTO_IRQ) { dev_err(&devptr->dev, "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) { dev_err(&device->dev, "no PnP port\n"); return -ENODEV; } if (pnp_port_len(device, 0) < IO_EXTENT) { dev_err(&device->dev, "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) { dev_warn(&device->dev, "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 pr_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)