arch/arm/plat-omap/dsp/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         mutex_lock_interruptible(&open_lock);
  47         if (omap_dsp->initialized == 0) {
  48                 ret = dsp_late_init();
  49                 if (ret != 0) {
  50                         mutex_unlock(&open_lock);
  51                         return ret;
  52                 }
  53                 omap_dsp->initialized = 1;
  54         }
  55         mutex_unlock(&open_lock);
  56
  57         switch (iminor(inode)) {
  58         case CTL_MINOR:
  59                 file->f_op = &dsp_ctl_fops;
  60                 break;
  61         case MEM_MINOR:
  62                 file->f_op = &dsp_mem_fops;
  63                 break;
  64         case TWCH_MINOR:
  65                 file->f_op = &dsp_twch_fops;
  66                 break;
  67         case ERR_MINOR:
  68                 file->f_op = &dsp_err_fops;
  69                 break;
  70         default:
  71                 return -ENXIO;
  72         }
  73         if (file->f_op && file->f_op->open)
  74                 return file->f_op->open(inode, file);
  75         return 0;
  76 }
  77
  78 static struct file_operations dsp_ctl_core_fops = {
  79         .owner = THIS_MODULE,
  80         .open  = dsp_ctl_core_open,
  81 };
  82
  83 static const struct dev_list {
  84         unsigned int    minor;
  85         char            *devname;
  86         umode_t         mode;
  87 } dev_list[] = {
  88         {CTL_MINOR,  "dspctl",  S_IRUSR | S_IWUSR},
  89         {MEM_MINOR,  "dspmem",  S_IRUSR | S_IWUSR | S_IRGRP},
  90         {TWCH_MINOR, "dsptwch", S_IRUSR | S_IWUSR | S_IRGRP},
  91         {ERR_MINOR,  "dsperr",  S_IRUSR | S_IRGRP},
  92 };
  93
  94 int __init dsp_ctl_core_init(void)
  95 {
  96         int retval;
  97         int i;
  98
  99         retval = register_chrdev(OMAP_DSP_CTL_MAJOR, "dspctl",
 100                                  &dsp_ctl_core_fops);
 101         if (retval < 0) {
 102                 printk(KERN_ERR
 103                        "omapdsp: failed to register dspctl device: %d\n",
 104                        retval);
 105                 return retval;
 106         }
 107
 108         dsp_ctl_class = class_create(THIS_MODULE, "dspctl");
 109         for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
 110                 class_device_create(dsp_ctl_class, NULL,
 111                                     MKDEV(OMAP_DSP_CTL_MAJOR,
 112                                           dev_list[i].minor),
 113                                     NULL, dev_list[i].devname);
 114         }
 115
 116         return 0;
 117 }
 118
 119 void dsp_ctl_core_exit(void)
 120 {
 121         int i;
 122
 123         for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
 124                 class_device_destroy(dsp_ctl_class,
 125                                      MKDEV(OMAP_DSP_CTL_MAJOR,
 126                                            dev_list[i].minor));
 127         }
 128         class_destroy(dsp_ctl_class);
 129
 130         unregister_chrdev(OMAP_DSP_CTL_MAJOR, "dspctl");
 131 }