drivers/dsp/dspgateway/dsp_ctl_core.c

   1 /*
   2  * This file is part of OMAP DSP driver (DSP Gateway version 3.3.1)
   3  *
   4  * Copyright (C) 2004-2006 Nokia Corporation. All rights reserved.
   5  *
   6  * Contact: Toshihiro Kobayashi <toshihiro.kobayashi@nokia.com>
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License
  10  * version 2 as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * 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., 51 Franklin St, Fifth Floor, Boston, MA
  20  * 02110-1301 USA
  21  *
  22  */
  23
  24 #include <linux/major.h>
  25 #include <linux/fs.h>
  26 #include <linux/device.h>
  27 #include <linux/init.h>
  28 #include "dsp.h"
  29
  30 #define CTL_MINOR       0
  31 #define MEM_MINOR       1
  32 #define TWCH_MINOR      2
  33 #define ERR_MINOR       3
  34
  35 static struct class *dsp_ctl_class;
  36 extern struct file_operations dsp_ctl_fops,
  37                               dsp_mem_fops,
  38                               dsp_twch_fops,
  39                               dsp_err_fops;
  40
  41 static int dsp_ctl_core_open(struct inode *inode, struct file *file)
  42 {
  43         static DEFINE_MUTEX(open_lock);
  44         int ret = 0;
  45
  46         if (mutex_lock_interruptible(&open_lock))
  47                 return -EINTR;
  48         if (omap_dsp->initialized == 0) {
  49                 ret = dsp_late_init();
  50                 if (ret != 0) {
  51                         mutex_unlock(&open_lock);
  52                         return ret;
  53                 }
  54                 omap_dsp->initialized = 1;
  55         }
  56         mutex_unlock(&open_lock);
  57
  58         switch (iminor(inode)) {
  59         case CTL_MINOR:
  60                 file->f_op = &dsp_ctl_fops;
  61                 break;
  62         case MEM_MINOR:
  63                 file->f_op = &dsp_mem_fops;
  64                 break;
  65         case TWCH_MINOR:
  66                 file->f_op = &dsp_twch_fops;
  67                 break;
  68         case ERR_MINOR:
  69                 file->f_op = &dsp_err_fops;
  70                 break;
  71         default:
  72                 return -ENXIO;
  73         }
  74         if (file->f_op && file->f_op->open)
  75                 return file->f_op->open(inode, file);
  76         return 0;
  77 }
  78
  79 static struct file_operations dsp_ctl_core_fops = {
  80         .owner = THIS_MODULE,
  81         .open  = dsp_ctl_core_open,
  82 };
  83
  84 static const struct dev_list {
  85         unsigned int    minor;
  86         char            *devname;
  87         umode_t         mode;
  88 } dev_list[] = {
  89         {CTL_MINOR,  "dspctl",  S_IRUSR | S_IWUSR},
  90         {MEM_MINOR,  "dspmem",  S_IRUSR | S_IWUSR | S_IRGRP},
  91         {TWCH_MINOR, "dsptwch", S_IRUSR | S_IWUSR | S_IRGRP},
  92         {ERR_MINOR,  "dsperr",  S_IRUSR | S_IRGRP},
  93 };
  94
  95 int __init dsp_ctl_core_init(void)
  96 {
  97         int retval;
  98         int i;
  99
 100         retval = register_chrdev(OMAP_DSP_CTL_MAJOR, "dspctl",
 101                                  &dsp_ctl_core_fops);
 102         if (retval < 0) {
 103                 printk(KERN_ERR
 104                        "omapdsp: failed to register dspctl device: %d\n",
 105                        retval);
 106                 return retval;
 107         }
 108
 109         dsp_ctl_class = class_create(THIS_MODULE, "dspctl");
 110         for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
 111                 device_create(dsp_ctl_class, NULL,
 112                                     MKDEV(OMAP_DSP_CTL_MAJOR,
 113                                           dev_list[i].minor),
 114                                     dev_list[i].devname);
 115         }
 116
 117         return 0;
 118 }
 119
 120 void dsp_ctl_core_exit(void)
 121 {
 122         int i;
 123
 124         for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
 125                 device_destroy(dsp_ctl_class,
 126                                 MKDEV(OMAP_DSP_CTL_MAJOR,
 127                                         dev_list[i].minor));
 128         }
 129         class_destroy(dsp_ctl_class);
 130
 131         unregister_chrdev(OMAP_DSP_CTL_MAJOR, "dspctl");
 132 }