sound/drivers/mpu401/mpu401.c

   1 /*
   2  *  Driver for generic MPU-401 boards (UART mode only)
   3  *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
   4  *  Copyright (c) 2004 by Castet Matthieu <castet.matthieu@free.fr>
   5  *
   6  *
   7  *   This program is free software; you can redistribute it and/or modify
   8  *   it under the terms of the GNU General Public License as published by
   9  *   the Free Software Foundation; either version 2 of the License, or
  10  *   (at your option) any later version.
  11  *
  12  *   This program is distributed in the hope that it will be useful,
  13  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *   GNU General Public License for more details.
  16  *
  17  *   You should have received a copy of the GNU General Public License
  18  *   along with this program; if not, write to the Free Software
  19  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  20  *
  21  */
  22
  23 #include <sound/driver.h>
  24 #include <linux/init.h>
  25 #include <linux/pnp.h>
  26 #include <linux/err.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/moduleparam.h>
  29 #include <sound/core.h>
  30 #include <sound/mpu401.h>
  31 #include <sound/initval.h>
  32
  33 MODULE_AUTHOR("Jaroslav Kysela <perex@suse.cz>");
  34 MODULE_DESCRIPTION("MPU-401 UART");
  35 MODULE_LICENSE("GPL");
  36
  37 static int index[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = -2}; /* exclude the first card */
  38 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
  39 static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE;  /* Enable this card */
  40 #ifdef CONFIG_PNP
  41 static int pnp[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
  42 #endif
  43 static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT;     /* MPU-401 port number */
  44 static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ;        /* MPU-401 IRQ */
  45
  46 module_param_array(index, int, NULL, 0444);
  47 MODULE_PARM_DESC(index, "Index value for MPU-401 device.");
  48 module_param_array(id, charp, NULL, 0444);
  49 MODULE_PARM_DESC(id, "ID string for MPU-401 device.");
  50 module_param_array(enable, bool, NULL, 0444);
  51 MODULE_PARM_DESC(enable, "Enable MPU-401 device.");
  52 #ifdef CONFIG_PNP
  53 module_param_array(pnp, bool, NULL, 0444);
  54 MODULE_PARM_DESC(pnp, "PnP detection for MPU-401 device.");
  55 #endif
  56 module_param_array(port, long, NULL, 0444);
  57 MODULE_PARM_DESC(port, "Port # for MPU-401 device.");
  58 module_param_array(irq, int, NULL, 0444);
  59 MODULE_PARM_DESC(irq, "IRQ # for MPU-401 device.");
  60
  61 static struct platform_device *platform_devices[SNDRV_CARDS];
  62 static int pnp_registered;
  63 static unsigned int snd_mpu401_devices;
  64
  65 static int snd_mpu401_create(int dev, struct snd_card **rcard)
  66 {
  67         struct snd_card *card;
  68         int err;
  69
  70         *rcard = NULL;
  71         card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
  72         if (card == NULL)
  73                 return -ENOMEM;
  74         strcpy(card->driver, "MPU-401 UART");
  75         strcpy(card->shortname, card->driver);
  76         sprintf(card->longname, "%s at %#lx, ", card->shortname, port[dev]);
  77         if (irq[dev] >= 0) {
  78                 sprintf(card->longname + strlen(card->longname), "irq %d", irq[dev]);
  79         } else {
  80                 strcat(card->longname, "polled");
  81         }
  82
  83         if ((err = snd_mpu401_uart_new(card, 0,
  84                                        MPU401_HW_MPU401,
  85                                        port[dev], 0,
  86                                        irq[dev], irq[dev] >= 0 ? IRQF_DISABLED : 0, NULL)) < 0) {
  87                 printk(KERN_ERR "MPU401 not detected at 0x%lx\n", port[dev]);
  88                 goto _err;
  89         }
  90
  91         *rcard = card;
  92         return 0;
  93
  94  _err:
  95         snd_card_free(card);
  96         return err;
  97 }
  98
  99 static int __devinit snd_mpu401_probe(struct platform_device *devptr)
 100 {
 101         int dev = devptr->id;
 102         int err;
 103         struct snd_card *card;
 104
 105         if (port[dev] == SNDRV_AUTO_PORT) {
 106                 snd_printk(KERN_ERR "specify port\n");
 107                 return -EINVAL;
 108         }
 109         if (irq[dev] == SNDRV_AUTO_IRQ) {
 110                 snd_printk(KERN_ERR "specify or disable IRQ\n");
 111                 return -EINVAL;
 112         }
 113         err = snd_mpu401_create(dev, &card);
 114         if (err < 0)
 115                 return err;
 116         snd_card_set_dev(card, &devptr->dev);
 117         if ((err = snd_card_register(card)) < 0) {
 118                 snd_card_free(card);
 119                 return err;
 120         }
 121         platform_set_drvdata(devptr, card);
 122         return 0;
 123 }
 124
 125 static int __devexit snd_mpu401_remove(struct platform_device *devptr)
 126 {
 127         snd_card_free(platform_get_drvdata(devptr));
 128         platform_set_drvdata(devptr, NULL);
 129         return 0;
 130 }
 131
 132 #define SND_MPU401_DRIVER       "snd_mpu401"
 133
 134 static struct platform_driver snd_mpu401_driver = {
 135         .probe          = snd_mpu401_probe,
 136         .remove         = __devexit_p(snd_mpu401_remove),
 137         .driver         = {
 138                 .name   = SND_MPU401_DRIVER
 139         },
 140 };
 141
 142
 143 #ifdef CONFIG_PNP
 144
 145 #define IO_EXTENT 2
 146
 147 static struct pnp_device_id snd_mpu401_pnpids[] = {
 148         { .id = "PNPb006" },
 149         { .id = "" }
 150 };
 151
 152 MODULE_DEVICE_TABLE(pnp, snd_mpu401_pnpids);
 153
 154 static int __devinit snd_mpu401_pnp(int dev, struct pnp_dev *device,
 155                                  const struct pnp_device_id *id)
 156 {
 157         if (!pnp_port_valid(device, 0) ||
 158             pnp_port_flags(device, 0) & IORESOURCE_DISABLED) {
 159                 snd_printk(KERN_ERR "no PnP port\n");
 160                 return -ENODEV;
 161         }
 162         if (pnp_port_len(device, 0) < IO_EXTENT) {
 163                 snd_printk(KERN_ERR "PnP port length is %llu, expected %d\n",
 164                            (unsigned long long)pnp_port_len(device, 0),
 165                            IO_EXTENT);
 166                 return -ENODEV;
 167         }
 168         port[dev] = pnp_port_start(device, 0);
 169
 170         if (!pnp_irq_valid(device, 0) ||
 171             pnp_irq_flags(device, 0) & IORESOURCE_DISABLED) {
 172                 snd_printk(KERN_WARNING "no PnP irq, using polling\n");
 173                 irq[dev] = -1;
 174         } else {
 175                 irq[dev] = pnp_irq(device, 0);
 176         }
 177         return 0;
 178 }
 179
 180 static int __devinit snd_mpu401_pnp_probe(struct pnp_dev *pnp_dev,
 181                                           const struct pnp_device_id *id)
 182 {
 183         static int dev;
 184         struct snd_card *card;
 185         int err;
 186
 187         for ( ; dev < SNDRV_CARDS; ++dev) {
 188                 if (!enable[dev] || !pnp[dev])
 189                         continue;
 190                 err = snd_mpu401_pnp(dev, pnp_dev, id);
 191                 if (err < 0)
 192                         return err;
 193                 err = snd_mpu401_create(dev, &card);
 194                 if (err < 0)
 195                         return err;
 196                 if ((err = snd_card_register(card)) < 0) {
 197                         snd_card_free(card);
 198                         return err;
 199                 }
 200                 snd_card_set_dev(card, &pnp_dev->dev);
 201                 pnp_set_drvdata(pnp_dev, card);
 202                 snd_mpu401_devices++;
 203                 ++dev;
 204                 return 0;
 205         }
 206         return -ENODEV;
 207 }
 208
 209 static void __devexit snd_mpu401_pnp_remove(struct pnp_dev *dev)
 210 {
 211         struct snd_card *card = (struct snd_card *) pnp_get_drvdata(dev);
 212
 213         snd_card_disconnect(card);
 214         snd_card_free_in_thread(card);
 215 }
 216
 217 static struct pnp_driver snd_mpu401_pnp_driver = {
 218         .name = "mpu401",
 219         .id_table = snd_mpu401_pnpids,
 220         .probe = snd_mpu401_pnp_probe,
 221         .remove = __devexit_p(snd_mpu401_pnp_remove),
 222 };
 223 #else
 224 static struct pnp_driver snd_mpu401_pnp_driver;
 225 #endif
 226
 227 static void __init_or_module snd_mpu401_unregister_all(void)
 228 {
 229         int i;
 230
 231         if (pnp_registered)
 232                 pnp_unregister_driver(&snd_mpu401_pnp_driver);
 233         for (i = 0; i < ARRAY_SIZE(platform_devices); ++i)
 234                 platform_device_unregister(platform_devices[i]);
 235         platform_driver_unregister(&snd_mpu401_driver);
 236 }
 237
 238 static int __init alsa_card_mpu401_init(void)
 239 {
 240         int i, err;
 241
 242         if ((err = platform_driver_register(&snd_mpu401_driver)) < 0)
 243                 return err;
 244
 245         for (i = 0; i < SNDRV_CARDS; i++) {
 246                 struct platform_device *device;
 247                 if (! enable[i])
 248                         continue;
 249 #ifdef CONFIG_PNP
 250                 if (pnp[i])
 251                         continue;
 252 #endif
 253                 device = platform_device_register_simple(SND_MPU401_DRIVER,
 254                                                          i, NULL, 0);
 255                 if (IS_ERR(device))
 256                         continue;
 257                 if (!platform_get_drvdata(device)) {
 258                         platform_device_unregister(device);
 259                         continue;
 260                 }
 261                 platform_devices[i] = device;
 262                 snd_mpu401_devices++;
 263         }
 264         err = pnp_register_driver(&snd_mpu401_pnp_driver);
 265         if (!err)
 266                 pnp_registered = 1;
 267
 268         if (!snd_mpu401_devices) {
 269 #ifdef MODULE
 270                 printk(KERN_ERR "MPU-401 device not found or device busy\n");
 271 #endif
 272                 snd_mpu401_unregister_all();
 273                 return -ENODEV;
 274         }
 275         return 0;
 276 }
 277
 278 static void __exit alsa_card_mpu401_exit(void)
 279 {
 280         snd_mpu401_unregister_all();
 281 }
 282
 283 module_init(alsa_card_mpu401_init)
 284 module_exit(alsa_card_mpu401_exit)