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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Driver for generic MPU-401 boards (UART mode only)4 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>5 * Copyright (c) 2004 by Castet Matthieu <castet.matthieu@free.fr>6 */7 8#include <linux/init.h>9#include <linux/pnp.h>10#include <linux/err.h>11#include <linux/platform_device.h>12#include <linux/module.h>13#include <sound/core.h>14#include <sound/mpu401.h>15#include <sound/initval.h>16 17MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");18MODULE_DESCRIPTION("MPU-401 UART");19MODULE_LICENSE("GPL");20 21static int index[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = -2}; /* exclude the first card */22static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR; /* ID for this card */23static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; /* Enable this card */24#ifdef CONFIG_PNP25static bool pnp[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};26#endif27static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT; /* MPU-401 port number */28static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ; /* MPU-401 IRQ */29static bool uart_enter[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};30 31module_param_array(index, int, NULL, 0444);32MODULE_PARM_DESC(index, "Index value for MPU-401 device.");33module_param_array(id, charp, NULL, 0444);34MODULE_PARM_DESC(id, "ID string for MPU-401 device.");35module_param_array(enable, bool, NULL, 0444);36MODULE_PARM_DESC(enable, "Enable MPU-401 device.");37#ifdef CONFIG_PNP38module_param_array(pnp, bool, NULL, 0444);39MODULE_PARM_DESC(pnp, "PnP detection for MPU-401 device.");40#endif41module_param_hw_array(port, long, ioport, NULL, 0444);42MODULE_PARM_DESC(port, "Port # for MPU-401 device.");43module_param_hw_array(irq, int, irq, NULL, 0444);44MODULE_PARM_DESC(irq, "IRQ # for MPU-401 device.");45module_param_array(uart_enter, bool, NULL, 0444);46MODULE_PARM_DESC(uart_enter, "Issue UART_ENTER command at open.");47 48static struct platform_device *platform_devices[SNDRV_CARDS];49static int pnp_registered;50static unsigned int snd_mpu401_devices;51 52static int snd_mpu401_create(struct device *devptr, int dev,53 struct snd_card **rcard)54{55 struct snd_card *card;56 int err;57 58 if (!uart_enter[dev])59 dev_err(devptr, "the uart_enter option is obsolete; remove it\n");60 61 *rcard = NULL;62 err = snd_devm_card_new(devptr, index[dev], id[dev], THIS_MODULE,63 0, &card);64 if (err < 0)65 return err;66 strcpy(card->driver, "MPU-401 UART");67 strcpy(card->shortname, card->driver);68 sprintf(card->longname, "%s at %#lx, ", card->shortname, port[dev]);69 if (irq[dev] >= 0) {70 sprintf(card->longname + strlen(card->longname), "irq %d", irq[dev]);71 } else {72 strcat(card->longname, "polled");73 }74 75 err = snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401, port[dev], 0,76 irq[dev], NULL);77 if (err < 0) {78 dev_err(devptr, "MPU401 not detected at 0x%lx\n", port[dev]);79 return err;80 }81 82 *rcard = card;83 return 0;84}85 86static int snd_mpu401_probe(struct platform_device *devptr)87{88 int dev = devptr->id;89 int err;90 struct snd_card *card;91 92 if (port[dev] == SNDRV_AUTO_PORT) {93 dev_err(&devptr->dev, "specify port\n");94 return -EINVAL;95 }96 if (irq[dev] == SNDRV_AUTO_IRQ) {97 dev_err(&devptr->dev, "specify or disable IRQ\n");98 return -EINVAL;99 }100 err = snd_mpu401_create(&devptr->dev, dev, &card);101 if (err < 0)102 return err;103 err = snd_card_register(card);104 if (err < 0)105 return err;106 platform_set_drvdata(devptr, card);107 return 0;108}109 110#define SND_MPU401_DRIVER "snd_mpu401"111 112static struct platform_driver snd_mpu401_driver = {113 .probe = snd_mpu401_probe,114 .driver = {115 .name = SND_MPU401_DRIVER,116 },117};118 119 120#ifdef CONFIG_PNP121 122#define IO_EXTENT 2123 124static const struct pnp_device_id snd_mpu401_pnpids[] = {125 { .id = "PNPb006" },126 { .id = "" }127};128 129MODULE_DEVICE_TABLE(pnp, snd_mpu401_pnpids);130 131static int snd_mpu401_pnp(int dev, struct pnp_dev *device,132 const struct pnp_device_id *id)133{134 if (!pnp_port_valid(device, 0) ||135 pnp_port_flags(device, 0) & IORESOURCE_DISABLED) {136 dev_err(&device->dev, "no PnP port\n");137 return -ENODEV;138 }139 if (pnp_port_len(device, 0) < IO_EXTENT) {140 dev_err(&device->dev, "PnP port length is %llu, expected %d\n",141 (unsigned long long)pnp_port_len(device, 0),142 IO_EXTENT);143 return -ENODEV;144 }145 port[dev] = pnp_port_start(device, 0);146 147 if (!pnp_irq_valid(device, 0) ||148 pnp_irq_flags(device, 0) & IORESOURCE_DISABLED) {149 dev_warn(&device->dev, "no PnP irq, using polling\n");150 irq[dev] = -1;151 } else {152 irq[dev] = pnp_irq(device, 0);153 }154 return 0;155}156 157static int snd_mpu401_pnp_probe(struct pnp_dev *pnp_dev,158 const struct pnp_device_id *id)159{160 static int dev;161 struct snd_card *card;162 int err;163 164 for ( ; dev < SNDRV_CARDS; ++dev) {165 if (!enable[dev] || !pnp[dev])166 continue;167 err = snd_mpu401_pnp(dev, pnp_dev, id);168 if (err < 0)169 return err;170 err = snd_mpu401_create(&pnp_dev->dev, dev, &card);171 if (err < 0)172 return err;173 err = snd_card_register(card);174 if (err < 0)175 return err;176 pnp_set_drvdata(pnp_dev, card);177 snd_mpu401_devices++;178 ++dev;179 return 0;180 }181 return -ENODEV;182}183 184static struct pnp_driver snd_mpu401_pnp_driver = {185 .name = "mpu401",186 .id_table = snd_mpu401_pnpids,187 .probe = snd_mpu401_pnp_probe,188};189#else190static struct pnp_driver snd_mpu401_pnp_driver;191#endif192 193static void snd_mpu401_unregister_all(void)194{195 int i;196 197 if (pnp_registered)198 pnp_unregister_driver(&snd_mpu401_pnp_driver);199 for (i = 0; i < ARRAY_SIZE(platform_devices); ++i)200 platform_device_unregister(platform_devices[i]);201 platform_driver_unregister(&snd_mpu401_driver);202}203 204static int __init alsa_card_mpu401_init(void)205{206 int i, err;207 208 err = platform_driver_register(&snd_mpu401_driver);209 if (err < 0)210 return err;211 212 for (i = 0; i < SNDRV_CARDS; i++) {213 struct platform_device *device;214 if (! enable[i])215 continue;216#ifdef CONFIG_PNP217 if (pnp[i])218 continue;219#endif220 device = platform_device_register_simple(SND_MPU401_DRIVER,221 i, NULL, 0);222 if (IS_ERR(device))223 continue;224 if (!platform_get_drvdata(device)) {225 platform_device_unregister(device);226 continue;227 }228 platform_devices[i] = device;229 snd_mpu401_devices++;230 }231 err = pnp_register_driver(&snd_mpu401_pnp_driver);232 if (!err)233 pnp_registered = 1;234 235 if (!snd_mpu401_devices) {236#ifdef MODULE237 pr_err("MPU-401 device not found or device busy\n");238#endif239 snd_mpu401_unregister_all();240 return -ENODEV;241 }242 return 0;243}244 245static void __exit alsa_card_mpu401_exit(void)246{247 snd_mpu401_unregister_all();248}249 250module_init(alsa_card_mpu401_init)251module_exit(alsa_card_mpu401_exit)252