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 static int uart_enter[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = 1};
  46
  47 module_param_array(index, int, NULL, 0444);
  48 MODULE_PARM_DESC(index, "Index value for MPU-401 device.");
  49 module_param_array(id, charp, NULL, 0444);
  50 MODULE_PARM_DESC(id, "ID string for MPU-401 device.");
  51 module_param_array(enable, bool, NULL, 0444);
  52 MODULE_PARM_DESC(enable, "Enable MPU-401 device.");
  53 #ifdef CONFIG_PNP
  54 module_param_array(pnp, bool, NULL, 0444);
  55 MODULE_PARM_DESC(pnp, "PnP detection for MPU-401 device.");
  56 #endif
  57 module_param_array(port, long, NULL, 0444);
  58 MODULE_PARM_DESC(port, "Port # for MPU-401 device.");
  59 module_param_array(irq, int, NULL, 0444);
  60 MODULE_PARM_DESC(irq, "IRQ # for MPU-401 device.");
  61 module_param_array(uart_enter, bool, NULL, 0444);
  62 MODULE_PARM_DESC(uart_enter, "Issue UART_ENTER command at open.");
  63
  64 static struct platform_device *platform_devices[SNDRV_CARDS];
  65 static int pnp_registered;
  66 static unsigned int snd_mpu401_devices;
  67
  68 static int snd_mpu401_create(int dev, struct snd_card **rcard)
  69 {
  70         struct snd_card *card;
  71         int err;
  72
  73         *rcard = NULL;
  74         card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
  75         if (card == NULL)
  76                 return -ENOMEM;
  77         strcpy(card->driver, "MPU-401 UART");
  78         strcpy(card->shortname, card->driver);
  79         sprintf(card->longname, "%s at %#lx, ", card->shortname, port[dev]);
  80         if (irq[dev] >= 0) {
  81                 sprintf(card->longname + strlen(card->longname), "irq %d", irq[dev]);
  82         } else {
  83                 strcat(card->longname, "polled");
  84         }
  85
  86         err = snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401, port[dev],
  87                                   uart_enter[dev] ? 0 : MPU401_INFO_UART_ONLY,
  88                                   irq[dev], irq[dev] >= 0 ? IRQF_DISABLED : 0,
  89                                   NULL);
  90         if (err < 0) {
  91                 printk(KERN_ERR "MPU401 not detected at 0x%lx\n", port[dev]);
  92                 goto _err;
  93         }
  94
  95         *rcard = card;
  96         return 0;
  97
  98  _err:
  99         snd_card_free(card);
 100         return err;
 101 }
 102
 103 static int __devinit snd_mpu401_probe(struct platform_device *devptr)
 104 {
 105         int dev = devptr->id;
 106         int err;
 107         struct snd_card *card;
 108
 109         if (port[dev] == SNDRV_AUTO_PORT) {
 110                 snd_printk(KERN_ERR "specify port\n");
 111                 return -EINVAL;
 112         }
 113         if (irq[dev] == SNDRV_AUTO_IRQ) {
 114                 snd_printk(KERN_ERR "specify or disable IRQ\n");
 115                 return -EINVAL;
 116         }
 117         err = snd_mpu401_create(dev, &card);
 118         if (err < 0)
 119                 return err;
 120         snd_card_set_dev(card, &devptr->dev);
 121         if ((err = snd_card_register(card)) < 0) {
 122                 snd_card_free(card);
 123                 return err;
 124         }
 125         platform_set_drvdata(devptr, card);
 126         return 0;
 127 }
 128
 129 static int __devexit snd_mpu401_remove(struct platform_device *devptr)
 130 {
 131         snd_card_free(platform_get_drvdata(devptr));
 132         platform_set_drvdata(devptr, NULL);
 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         = __devexit_p(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 __devinit 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 __devinit 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(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                 snd_card_set_dev(card, &pnp_dev->dev);
 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 __devexit 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 = __devexit_p(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)