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 <asm/io.h>
  29 #include "dsp.h"
  30
  31 #define CTL_MINOR       0
  32 #define MEM_MINOR       1
  33 #define TWCH_MINOR      2
  34 #define ERR_MINOR       3
  35
  36 static struct class *dsp_ctl_class;
  37 extern struct file_operations dsp_ctl_fops,
  38                               dsp_mem_fops,
  39                               dsp_twch_fops,
  40                               dsp_err_fops;
  41
  42 static int dsp_ctl_core_open(struct inode *inode, struct file *file)
  43 {
  44         static DEFINE_MUTEX(open_lock);
  45         int ret = 0;
  46
  47         if (mutex_lock_interruptible(&open_lock))
  48                 return -EINTR;
  49         if (omap_dsp->initialized == 0) {
  50                 ret = dsp_late_init();
  51                 if (ret != 0) {
  52                         mutex_unlock(&open_lock);
  53                         return ret;
  54                 }
  55                 omap_dsp->initialized = 1;
  56         }
  57         mutex_unlock(&open_lock);
  58
  59         switch (iminor(inode)) {
  60         case CTL_MINOR:
  61                 file->f_op = &dsp_ctl_fops;
  62                 break;
  63         case MEM_MINOR:
  64                 file->f_op = &dsp_mem_fops;
  65                 break;
  66         case TWCH_MINOR:
  67                 file->f_op = &dsp_twch_fops;
  68                 break;
  69         case ERR_MINOR:
  70                 file->f_op = &dsp_err_fops;
  71                 break;
  72         default:
  73                 return -ENXIO;
  74         }
  75         if (file->f_op && file->f_op->open)
  76                 return file->f_op->open(inode, file);
  77         return 0;
  78 }
  79
  80 static struct file_operations dsp_ctl_core_fops = {
  81         .owner = THIS_MODULE,
  82         .open  = dsp_ctl_core_open,
  83 };
  84
  85 static const struct dev_list {
  86         unsigned int    minor;
  87         char            *devname;
  88         umode_t         mode;
  89 } dev_list[] = {
  90         {CTL_MINOR,  "dspctl",  S_IRUSR | S_IWUSR},
  91         {MEM_MINOR,  "dspmem",  S_IRUSR | S_IWUSR | S_IRGRP},
  92         {TWCH_MINOR, "dsptwch", S_IRUSR | S_IWUSR | S_IRGRP},
  93         {ERR_MINOR,  "dsperr",  S_IRUSR | S_IRGRP},
  94 };
  95
  96 int __init dsp_ctl_core_init(void)
  97 {
  98         int retval;
  99         int i;
 100
 101         retval = register_chrdev(OMAP_DSP_CTL_MAJOR, "dspctl",
 102                                  &dsp_ctl_core_fops);
 103         if (retval < 0) {
 104                 printk(KERN_ERR
 105                        "omapdsp: failed to register dspctl device: %d\n",
 106                        retval);
 107                 return retval;
 108         }
 109
 110         dsp_ctl_class = class_create(THIS_MODULE, "dspctl");
 111         for (i = 0; i < ARRAY_SIZE(dev_list); i++) {
 112                 device_create(dsp_ctl_class, NULL,
 113                               MKDEV(OMAP_DSP_CTL_MAJOR, dev_list[i].minor),
 114                               NULL, 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 }