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                 .owner  = THIS_MODULE,
 144         },
 145 };
 146
 147
 148 #ifdef CONFIG_PNP
 149
 150 #define IO_EXTENT 2
 151
 152 static struct pnp_device_id snd_mpu401_pnpids[] = {
 153         { .id = "PNPb006" },
 154         { .id = "" }
 155 };
 156
 157 MODULE_DEVICE_TABLE(pnp, snd_mpu401_pnpids);
 158
 159 static int snd_mpu401_pnp(int dev, struct pnp_dev *device,
 160                           const struct pnp_device_id *id)
 161 {
 162         if (!pnp_port_valid(device, 0) ||
 163             pnp_port_flags(device, 0) & IORESOURCE_DISABLED) {
 164                 snd_printk(KERN_ERR "no PnP port\n");
 165                 return -ENODEV;
 166         }
 167         if (pnp_port_len(device, 0) < IO_EXTENT) {
 168                 snd_printk(KERN_ERR "PnP port length is %llu, expected %d\n",
 169                            (unsigned long long)pnp_port_len(device, 0),
 170                            IO_EXTENT);
 171                 return -ENODEV;
 172         }
 173         port[dev] = pnp_port_start(device, 0);
 174
 175         if (!pnp_irq_valid(device, 0) ||
 176             pnp_irq_flags(device, 0) & IORESOURCE_DISABLED) {
 177                 snd_printk(KERN_WARNING "no PnP irq, using polling\n");
 178                 irq[dev] = -1;
 179         } else {
 180                 irq[dev] = pnp_irq(device, 0);
 181         }
 182         return 0;
 183 }
 184
 185 static int snd_mpu401_pnp_probe(struct pnp_dev *pnp_dev,
 186                                 const struct pnp_device_id *id)
 187 {
 188         static int dev;
 189         struct snd_card *card;
 190         int err;
 191
 192         for ( ; dev < SNDRV_CARDS; ++dev) {
 193                 if (!enable[dev] || !pnp[dev])
 194                         continue;
 195                 err = snd_mpu401_pnp(dev, pnp_dev, id);
 196                 if (err < 0)
 197                         return err;
 198                 err = snd_mpu401_create(&pnp_dev->dev, dev, &card);
 199                 if (err < 0)
 200                         return err;
 201                 if ((err = snd_card_register(card)) < 0) {
 202                         snd_card_free(card);
 203                         return err;
 204                 }
 205                 pnp_set_drvdata(pnp_dev, card);
 206                 snd_mpu401_devices++;
 207                 ++dev;
 208                 return 0;
 209         }
 210         return -ENODEV;
 211 }
 212
 213 static void snd_mpu401_pnp_remove(struct pnp_dev *dev)
 214 {
 215         struct snd_card *card = (struct snd_card *) pnp_get_drvdata(dev);
 216
 217         snd_card_disconnect(card);
 218         snd_card_free_when_closed(card);
 219 }
 220
 221 static struct pnp_driver snd_mpu401_pnp_driver = {
 222         .name = "mpu401",
 223         .id_table = snd_mpu401_pnpids,
 224         .probe = snd_mpu401_pnp_probe,
 225         .remove = snd_mpu401_pnp_remove,
 226 };
 227 #else
 228 static struct pnp_driver snd_mpu401_pnp_driver;
 229 #endif
 230
 231 static void snd_mpu401_unregister_all(void)
 232 {
 233         int i;
 234
 235         if (pnp_registered)
 236                 pnp_unregister_driver(&snd_mpu401_pnp_driver);
 237         for (i = 0; i < ARRAY_SIZE(platform_devices); ++i)
 238                 platform_device_unregister(platform_devices[i]);
 239         platform_driver_unregister(&snd_mpu401_driver);
 240 }
 241
 242 static int __init alsa_card_mpu401_init(void)
 243 {
 244         int i, err;
 245
 246         if ((err = platform_driver_register(&snd_mpu401_driver)) < 0)
 247                 return err;
 248
 249         for (i = 0; i < SNDRV_CARDS; i++) {
 250                 struct platform_device *device;
 251                 if (! enable[i])
 252                         continue;
 253 #ifdef CONFIG_PNP
 254                 if (pnp[i])
 255                         continue;
 256 #endif
 257                 device = platform_device_register_simple(SND_MPU401_DRIVER,
 258                                                          i, NULL, 0);
 259                 if (IS_ERR(device))
 260                         continue;
 261                 if (!platform_get_drvdata(device)) {
 262                         platform_device_unregister(device);
 263                         continue;
 264                 }
 265                 platform_devices[i] = device;
 266                 snd_mpu401_devices++;
 267         }
 268         err = pnp_register_driver(&snd_mpu401_pnp_driver);
 269         if (!err)
 270                 pnp_registered = 1;
 271
 272         if (!snd_mpu401_devices) {
 273 #ifdef MODULE
 274                 printk(KERN_ERR "MPU-401 device not found or device busy\n");
 275 #endif
 276                 snd_mpu401_unregister_all();
 277                 return -ENODEV;
 278         }
 279         return 0;
 280 }
 281
 282 static void __exit alsa_card_mpu401_exit(void)
 283 {
 284         snd_mpu401_unregister_all();
 285 }
 286
 287 module_init(alsa_card_mpu401_init)
 288 module_exit(alsa_card_mpu401_exit)