sound/drivers/mpu401/mpu401.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   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
  17 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  18 MODULE_DESCRIPTION("MPU-401 UART");
  19 MODULE_LICENSE("GPL");
  20
  21 static int index[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = -2}; /* exclude the first card */
  22 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
  23 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; /* Enable this card */
  24 #ifdef CONFIG_PNP
  25 static bool pnp[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
  26 #endif
  27 static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT;     /* MPU-401 port number */
  28 static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ;        /* MPU-401 IRQ */
  29 static bool uart_enter[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
  30
  31 module_param_array(index, int, NULL, 0444);
  32 MODULE_PARM_DESC(index, "Index value for MPU-401 device.");
  33 module_param_array(id, charp, NULL, 0444);
  34 MODULE_PARM_DESC(id, "ID string for MPU-401 device.");
  35 module_param_array(enable, bool, NULL, 0444);
  36 MODULE_PARM_DESC(enable, "Enable MPU-401 device.");
  37 #ifdef CONFIG_PNP
  38 module_param_array(pnp, bool, NULL, 0444);
  39 MODULE_PARM_DESC(pnp, "PnP detection for MPU-401 device.");
  40 #endif
  41 module_param_hw_array(port, long, ioport, NULL, 0444);
  42 MODULE_PARM_DESC(port, "Port # for MPU-401 device.");
  43 module_param_hw_array(irq, int, irq, NULL, 0444);
  44 MODULE_PARM_DESC(irq, "IRQ # for MPU-401 device.");
  45 module_param_array(uart_enter, bool, NULL, 0444);
  46 MODULE_PARM_DESC(uart_enter, "Issue UART_ENTER command at open.");
  47
  48 static struct platform_device *platform_devices[SNDRV_CARDS];
  49 static int pnp_registered;
  50 static unsigned int snd_mpu401_devices;
  51
  52 static 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                 snd_printk(KERN_ERR "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                 printk(KERN_ERR "MPU401 not detected at 0x%lx\n", port[dev]);
  79                 return err;
  80         }
  81
  82         *rcard = card;
  83         return 0;
  84 }
  85
  86 static 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                 snd_printk(KERN_ERR "specify port\n");
  94                 return -EINVAL;
  95         }
  96         if (irq[dev] == SNDRV_AUTO_IRQ) {
  97                 snd_printk(KERN_ERR "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
 112 static 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_PNP
 121
 122 #define IO_EXTENT 2
 123
 124 static const struct pnp_device_id snd_mpu401_pnpids[] = {
 125         { .id = "PNPb006" },
 126         { .id = "" }
 127 };
 128
 129 MODULE_DEVICE_TABLE(pnp, snd_mpu401_pnpids);
 130
 131 static 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                 snd_printk(KERN_ERR "no PnP port\n");
 137                 return -ENODEV;
 138         }
 139         if (pnp_port_len(device, 0) < IO_EXTENT) {
 140                 snd_printk(KERN_ERR "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                 snd_printk(KERN_WARNING "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
 157 static 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
 184 static struct pnp_driver snd_mpu401_pnp_driver = {
 185         .name = "mpu401",
 186         .id_table = snd_mpu401_pnpids,
 187         .probe = snd_mpu401_pnp_probe,
 188 };
 189 #else
 190 static struct pnp_driver snd_mpu401_pnp_driver;
 191 #endif
 192
 193 static 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
 204 static 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_PNP
 217                 if (pnp[i])
 218                         continue;
 219 #endif
 220                 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 MODULE
 237                 printk(KERN_ERR "MPU-401 device not found or device busy\n");
 238 #endif
 239                 snd_mpu401_unregister_all();
 240                 return -ENODEV;
 241         }
 242         return 0;
 243 }
 244
 245 static void __exit alsa_card_mpu401_exit(void)
 246 {
 247         snd_mpu401_unregister_all();
 248 }
 249
 250 module_init(alsa_card_mpu401_init)
 251 module_exit(alsa_card_mpu401_exit)