kernel/sound/drivers/mpu401/mpu401.c

   1 /*
   2  *  Driver for generic MPU-401 boards (UART mode only)
   3  *  Copyright (c) by Jaroslav Kysela <perex@perex.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 <linux/init.h>
  24 #include <linux/pnp.h>
  25 #include <linux/err.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/module.h>
  28 #include <sound/core.h>
  29 #include <sound/mpu401.h>
  30 #include <sound/initval.h>
  31
  32 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  33 MODULE_DESCRIPTION("MPU-401 UART");
  34 MODULE_LICENSE("GPL");
  35
  36 static int index[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = -2}; /* exclude the first card */
  37 static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;       /* ID for this card */
  38 static bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE; /* Enable this card */
  39 #ifdef CONFIG_PNP
  40 static bool pnp[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
  41 #endif
  42 static long port[SNDRV_CARDS] = SNDRV_DEFAULT_PORT;     /* MPU-401 port number */
  43 static int irq[SNDRV_CARDS] = SNDRV_DEFAULT_IRQ;        /* MPU-401 IRQ */
  44 static bool uart_enter[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
  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 module_param_array(uart_enter, bool, NULL, 0444);
  61 MODULE_PARM_DESC(uart_enter, "Issue UART_ENTER command at open.");
  62
  63 static struct platform_device *platform_devices[SNDRV_CARDS];
  64 static int pnp_registered;
  65 static unsigned int snd_mpu401_devices;
  66
  67 static int snd_mpu401_create(struct device *devptr, int dev,
  68                              struct snd_card **rcard)
  69 {
  70         struct snd_card *card;
  71         int err;
  72
  73         if (!uart_enter[dev])
  74                 snd_printk(KERN_ERR "the uart_enter option is obsolete; remove it\n");
  75
  76         *rcard = NULL;
  77         err = snd_card_new(devptr, index[dev], id[dev], THIS_MODULE,
  78                            0, &card);
  79         if (err < 0)
  80                 return err;
  81         strcpy(card->driver, "MPU-401 UART");
  82         strcpy(card->shortname, card->driver);
  83         sprintf(card->longname, "%s at %#lx, ", card->shortname, port[dev]);
  84         if (irq[dev] >= 0) {
  85                 sprintf(card->longname + strlen(card->longname), "irq %d", irq[dev]);
  86         } else {
  87                 strcat(card->longname, "polled");
  88         }
  89
  90         err = snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401, port[dev], 0,
  91                                   irq[dev], NULL);
  92         if (err < 0) {
  93                 printk(KERN_ERR "MPU401 not detected at 0x%lx\n", port[dev]);
  94                 goto _err;
  95         }
  96
  97         *rcard = card;
  98         return 0;
  99
 100  _err:
 101         snd_card_free(card);
 102         return err;
 103 }
 104
 105 static int snd_mpu401_probe(struct platform_device *devptr)
 106 {
 107         int dev = devptr->id;
 108         int err;
 109         struct snd_card *card;
 110
 111         if (port[dev] == SNDRV_AUTO_PORT) {
 112                 snd_printk(KERN_ERR "specify port\n");
 113                 return -EINVAL;
 114         }
 115         if (irq[dev] == SNDRV_AUTO_IRQ) {
 116                 snd_printk(KERN_ERR "specify or disable IRQ\n");
 117                 return -EINVAL;
 118         }
 119         err = snd_mpu401_create(&devptr->dev, dev, &card);
 120         if (err < 0)
 121                 return err;
 122         if ((err = snd_card_register(card)) < 0) {
 123                 snd_card_free(card);
 124                 return err;
 125         }
 126         platform_set_drvdata(devptr, card);
 127         return 0;
 128 }
 129
 130 static int snd_mpu401_remove(struct platform_device *devptr)
 131 {
 132         snd_card_free(platform_get_drvdata(devptr));
 133         return 0;
 134 }
 135
 136 #define SND_MPU401_DRIVER       "snd_mpu401"
 137
 138 static struct platform_driver snd_mpu401_driver = {
 139         .probe          = snd_mpu401_probe,
 140         .remove         = snd_mpu401_remove,
 141         .driver         = {
 142                 .name   = SND_MPU401_DRIVER,
 143         },
 144 };
 145
 146
 147 #ifdef CONFIG_PNP
 148
 149 #define IO_EXTENT 2
 150
 151 static struct pnp_device_id snd_mpu401_pnpids[] = {
 152         { .id = "PNPb006" },
 153         { .id = "" }
 154 };
 155
 156 MODULE_DEVICE_TABLE(pnp, snd_mpu401_pnpids);
 157
 158 static int snd_mpu401_pnp(int dev, struct pnp_dev *device,
 159                           const struct pnp_device_id *id)
 160 {
 161         if (!pnp_port_valid(device, 0) ||
 162             pnp_port_flags(device, 0) & IORESOURCE_DISABLED) {
 163                 snd_printk(KERN_ERR "no PnP port\n");
 164                 return -ENODEV;
 165         }
 166         if (pnp_port_len(device, 0) < IO_EXTENT) {
 167                 snd_printk(KERN_ERR "PnP port length is %llu, expected %d\n",
 168                            (unsigned long long)pnp_port_len(device, 0),
 169                            IO_EXTENT);
 170                 return -ENODEV;
 171         }
 172         port[dev] = pnp_port_start(device, 0);
 173
 174         if (!pnp_irq_valid(device, 0) ||
 175             pnp_irq_flags(device, 0) & IORESOURCE_DISABLED) {
 176                 snd_printk(KERN_WARNING "no PnP irq, using polling\n");
 177                 irq[dev] = -1;
 178         } else {
 179                 irq[dev] = pnp_irq(device, 0);
 180         }
 181         return 0;
 182 }
 183
 184 static int snd_mpu401_pnp_probe(struct pnp_dev *pnp_dev,
 185                                 const struct pnp_device_id *id)
 186 {
 187         static int dev;
 188         struct snd_card *card;
 189         int err;
 190
 191         for ( ; dev < SNDRV_CARDS; ++dev) {
 192                 if (!enable[dev] || !pnp[dev])
 193                         continue;
 194                 err = snd_mpu401_pnp(dev, pnp_dev, id);
 195                 if (err < 0)
 196                         return err;
 197                 err = snd_mpu401_create(&pnp_dev->dev, dev, &card);
 198                 if (err < 0)
 199                         return err;
 200                 if ((err = snd_card_register(card)) < 0) {
 201                         snd_card_free(card);
 202                         return err;
 203                 }
 204                 pnp_set_drvdata(pnp_dev, card);
 205                 snd_mpu401_devices++;
 206                 ++dev;
 207                 return 0;
 208         }
 209         return -ENODEV;
 210 }
 211
 212 static void snd_mpu401_pnp_remove(struct pnp_dev *dev)
 213 {
 214         struct snd_card *card = (struct snd_card *) pnp_get_drvdata(dev);
 215
 216         snd_card_disconnect(card);
 217         snd_card_free_when_closed(card);
 218 }
 219
 220 static struct pnp_driver snd_mpu401_pnp_driver = {
 221         .name = "mpu401",
 222         .id_table = snd_mpu401_pnpids,
 223         .probe = snd_mpu401_pnp_probe,
 224         .remove = snd_mpu401_pnp_remove,
 225 };
 226 #else
 227 static struct pnp_driver snd_mpu401_pnp_driver;
 228 #endif
 229
 230 static void snd_mpu401_unregister_all(void)
 231 {
 232         int i;
 233
 234         if (pnp_registered)
 235                 pnp_unregister_driver(&snd_mpu401_pnp_driver);
 236         for (i = 0; i < ARRAY_SIZE(platform_devices); ++i)
 237                 platform_device_unregister(platform_devices[i]);
 238         platform_driver_unregister(&snd_mpu401_driver);
 239 }
 240
 241 static int __init alsa_card_mpu401_init(void)
 242 {
 243         int i, err;
 244
 245         if ((err = platform_driver_register(&snd_mpu401_driver)) < 0)
 246                 return err;
 247
 248         for (i = 0; i < SNDRV_CARDS; i++) {
 249                 struct platform_device *device;
 250                 if (! enable[i])
 251                         continue;
 252 #ifdef CONFIG_PNP
 253                 if (pnp[i])
 254                         continue;
 255 #endif
 256                 device = platform_device_register_simple(SND_MPU401_DRIVER,
 257                                                          i, NULL, 0);
 258                 if (IS_ERR(device))
 259                         continue;
 260                 if (!platform_get_drvdata(device)) {
 261                         platform_device_unregister(device);
 262                         continue;
 263                 }
 264                 platform_devices[i] = device;
 265                 snd_mpu401_devices++;
 266         }
 267         err = pnp_register_driver(&snd_mpu401_pnp_driver);
 268         if (!err)
 269                 pnp_registered = 1;
 270
 271         if (!snd_mpu401_devices) {
 272 #ifdef MODULE
 273                 printk(KERN_ERR "MPU-401 device not found or device busy\n");
 274 #endif
 275                 snd_mpu401_unregister_all();
 276                 return -ENODEV;
 277         }
 278         return 0;
 279 }
 280
 281 static void __exit alsa_card_mpu401_exit(void)
 282 {
 283         snd_mpu401_unregister_all();
 284 }
 285
 286 module_init(alsa_card_mpu401_init)
 287 module_exit(alsa_card_mpu401_exit)