liftmon_snowcon_mediaengine.c.txt

这是《嵌入式linux－硬件、软件与接口》一书对应的所有linux方面实例的源代码

  int rv = 0;
  
/* Create the trailblazer /proc entry */
  tb_dir = proc_mkdir("trailblazer", NULL);
  if(tb_dir == NULL) {
    rv = -ENOMEM;
    goto out;
  }
  tb_dir->owner = THIS_MODULE;

/* Create liftacmains and make it readable by all - 0444 */
  liftacmains_file = create_proc_entry("liftacmains", 0444, tb_dir);
  if(liftacmains_file == NULL) {
    rv = -ENOMEM;
    goto no_liftacmains;
  }
  liftacmains_data.mask = LIFTACMAINS;
  liftacmains_file->data = &liftacmains_data;
  liftacmains_file->read_proc = &proc_read_liftmon;
  liftacmains_file->write_proc = NULL;
  liftacmains_file->owner = THIS_MODULE;
  

/* Create liftmotorcontroller and make it readable by all - 0444 */
  liftmotorcontroller_file = create_proc_entry("liftmotorcontroller", 
                                               0444, tb_dir);
  if(liftmotorcontroller_file == NULL) {
    rv = -ENOMEM;
    goto no_liftmotorcontroller;
  }
  liftmotorcontroller_data.mask = LIFTMOTORCONTROLLER;
  liftmotorcontroller_file->data = &liftmotorcontroller_data;
  liftmotorcontroller_file->read_proc = &proc_read_liftmon;
  liftmotorcontroller_file->write_proc = NULL;
  liftmotorcontroller_file->owner = THIS_MODULE;
  
/* Create liftslowspeed and make it readable by all - 0444 */
  liftslowspeed_file = create_proc_entry("liftslowspeed", 0444, tb_dir);
  if(liftslowspeed_file == NULL) {
    rv = -ENOMEM;
    goto no_liftslowspeed;
  }
  liftslowspeed_data.mask = LIFTSLOWSPEED;
  liftslowspeed_file->data = &liftslowspeed_data;
  liftslowspeed_file->read_proc = &proc_read_liftmon;
  liftslowspeed_file->write_proc = NULL;
  liftslowspeed_file->owner = THIS_MODULE;
  
/* Create lifthighspeed and make it readable by all - 0444 */
  lifthighspeed_file = create_proc_entry("lifthighspeed", 0444, tb_dir);
  if(lifthighspeed_file == NULL) {
    rv = -ENOMEM;
    goto no_lifthighspeed;
  }
  lifthighspeed_data.mask = LIFTHIGHSPEED;
  lifthighspeed_file->data = &lifthighspeed_data;
  lifthighspeed_file->read_proc = &proc_read_liftmon;
  lifthighspeed_file->write_proc = NULL;
  lifthighspeed_file->owner = THIS_MODULE;
  
/* Create liftoperatorswitchbase and make it readable by all - 0444 */
  liftoperatorswitchbase_file = create_proc_entry("liftoperatorswitchbase", 
                                                  0444, tb_dir);
  if(liftoperatorswitchbase_file == NULL) {
    rv = -ENOMEM;
    goto no_liftoperatorswitchbase;
  }
  liftoperatorswitchbase_data.mask = LIFTOPERATORSWITCHBASE;
  liftoperatorswitchbase_file->data = &liftoperatorswitchbase_data;
  liftoperatorswitchbase_file->read_proc = &proc_read_liftmon;
  liftoperatorswitchbase_file->write_proc = NULL;
  liftoperatorswitchbase_file->owner = THIS_MODULE;
  
/* Create liftoperatorswitchtop and make it readable by all - 0444 */
  liftoperatorswitchtop_file = create_proc_entry("liftoperatorswitchtop", 
                                                 0444, tb_dir);
  if(liftoperatorswitchtop_file == NULL) {
    rv = -ENOMEM;
    goto no_liftoperatorswitchtop;
  }
  liftoperatorswitchtop_data.mask = LIFTOPERATORSWITCHTOP;
  liftoperatorswitchtop_file->data = &liftoperatorswitchtop_data;
  liftoperatorswitchtop_file->read_proc = &proc_read_liftmon;
  liftoperatorswitchtop_file->write_proc = NULL;
  liftoperatorswitchtop_file->owner = THIS_MODULE;
  
/* Create snowwatervalve1 and make it root writeable, readable by all-0644 */
  snowwatervalve1_file = create_proc_entry("snowwatervalve1", 0644, tb_dir);
  if(snowwatervalve1_file == NULL) {
    rv = -ENOMEM;
    goto no_snowwatervalve1;
  }
  snowwatervalve1_data.mask = SNOWWATERVALVE1;
  snowwatervalve1_file->data = &snowwatervalve1_data;
  snowwatervalve1_file->read_proc = &proc_read_snowcondata;
  snowwatervalve1_file->write_proc = &proc_write_snowcondata;
  snowwatervalve1_file->owner = THIS_MODULE;
  
/* Create snowwatervalve2 and make it root writeable, readable by all-0644 */
  snowwatervalve2_file = create_proc_entry("snowwatervalve2", 0644, tb_dir);
  if(snowwatervalve2_file == NULL) {
    rv = -ENOMEM;
    goto no_snowwatervalve2;
  }
  snowwatervalve2_data.mask = SNOWWATERVALVE2;
  snowwatervalve2_file->data = &snowwatervalve2_data;
  snowwatervalve2_file->read_proc = &proc_read_snowcondata;
  snowwatervalve2_file->write_proc = &proc_write_snowcondata;
  snowwatervalve2_file->owner = THIS_MODULE;
  
/* Create snowwatervalve3 and make it root writeable, readable by all-0644 */
  snowwatervalve3_file = create_proc_entry("snowwatervalve3", 0644, tb_dir);
  if(snowwatervalve3_file == NULL) {
    rv = -ENOMEM;
    goto no_snowwatervalve3;
  }
  snowwatervalve3_data.mask = SNOWWATERVALVE3;
  snowwatervalve3_file->data = &snowwatervalve3_data;
  snowwatervalve3_file->read_proc = &proc_read_snowcondata;
  snowwatervalve3_file->write_proc = &proc_write_snowcondata;
  snowwatervalve3_file->owner = THIS_MODULE;
  
/* Create snowheater1 and make it root writeable, readable by all-0644 */
  snowheater1_file = create_proc_entry("snowheater1", 0644, tb_dir);
  if(snowheater1_file == NULL) {
    rv = -ENOMEM;
    goto no_snowheater1;
  }
  snowheater1_data.mask = SNOWHEATER1;
  snowheater1_file->data = &snowheater1_data;
  snowheater1_file->read_proc = &proc_read_snowcondata;
  snowheater1_file->write_proc = &proc_write_snowcondata;
  snowheater1_file->owner = THIS_MODULE;



/* setting up the memory controller to run slowly with /CS5 */
/* get the remapped memory controller base address register */
  mem_base = ioremap_nocache(MEMBASE, MEMLENGTH);
  printk("mem_base  = 0x%08X\n",mem_base);

/* we need to preserve the other bits in msc2 */
  msc2 = readl(mem_base + MSC2_OFFSET);
  printk("MSC2      = 0x%08X\n",msc2);

/* msc2 is for cs5 and cs4, need to mask off the cs3 part */
/* 0xFFF5, non burst SRAM variable, 16 bits, long delays */
  writel((msc2 & 0x0000FFFF) | 0xFFF50000, mem_base + MSC2_OFFSET);

/* read back the new msc2 value and print it */
  msc2 = readl(mem_base + MSC2_OFFSET);
  printk("MSC2      = 0x%08X\n",msc2);

/* get the remapped GPIO controller base address register */
  io_base = ioremap_nocache(EXPANSIONPORT, EXPANSIONPORTLEN);
  printk("io_base   = 0x%08X\n",io_base);

            
/* set up the I/O controller for GPIO14 output */
/* get the remapped GPIO controller base address register */
  gpio_base = ioremap_nocache(GPIO, GPIOLEN);
  printk("gpio_base = 0x%08X\n",gpio_base);

/* we need to preserve the other bits in gpdr */
  gpdr = readl(gpio_base + GPDR_OFFSET); 
  printk("GPDR      = 0x%08X\n",gpdr);

/* we need to preserve the other bits in gafr */
  gafr = readl(gpio_base + GAFR_OFFSET); 
  printk("GAFR      = 0x%08X\n",gafr);

/* initialize snowcondata to 0xFF, all output modules off */
/* output modules invert */
  snowcondata = 0xFF;
  writeb(snowcondata, io_base); /* turn off all output modules */
  writel(GPIO14            , gpio_base + GPSR_OFFSET); /* set GPIO14 */
  writel(gpdr | GPIO_GPIO14, gpio_base + GPDR_OFFSET); /* set GPIO14 output*/
  writel(GPIO14            , gpio_base + GPCR_OFFSET); /* clear GPIO14 */ 
    /* clearing GPIO14 turns on output buffer controlling output modules */

/* everything initialized */
  printk(KERN_INFO "%s %s initialized\n",MODULE_NAME, MODULE_VERSION);
  return 0;
  
/* this removes /proc entries if we have an error along the way */
no_snowheater1:
  remove_proc_entry("snowwatervalve3", tb_dir);
no_snowwatervalve3:
  remove_proc_entry("snowwatervalve2", tb_dir);
no_snowwatervalve2:
  remove_proc_entry("snowwatervalve1", tb_dir);
no_snowwatervalve1:
  remove_proc_entry("liftoperatorswitchtop", tb_dir);
no_liftoperatorswitchtop:
  remove_proc_entry("liftoperatorswitchbase", tb_dir);
no_liftoperatorswitchbase:
  remove_proc_entry("lifthighspeed", tb_dir);
no_lifthighspeed:
  remove_proc_entry("liftslowspeed", tb_dir);
no_liftslowspeed:
  remove_proc_entry("liftmotorcontroller", tb_dir);
no_liftmotorcontroller:
  remove_proc_entry("liftacmains", tb_dir);
no_liftacmains:
  remove_proc_entry("trailblazer", NULL);
out:
  return rv;
}


/* exit - cleanup_liftmon_snowcon
 * cleanup_liftmon_snowcon turns off the output modules and
 * deasserts the OUTPUT_ENABLE signal. It removes the /proc entry files
 * prints a message to the system log.
 */
static void __exit cleanup_liftmon_snowcon(void)
{
  writel(gpdr, gpio_base + GPDR_OFFSET); /* restore gpdr */
  writel(gafr, gpio_base + GAFR_OFFSET); /* restore gafr */
  writel(msc2, mem_base  + MSC2_OFFSET); /* restore msc2 */

/* release the ioremaps */ 
  iounmap(mem_base);
  iounmap(gpio_base);
  iounmap(io_base);

/* removing the /proc entries */
  remove_proc_entry("liftacmains", tb_dir);
  remove_proc_entry("liftmotorcontroller", tb_dir);
  remove_proc_entry("liftslowspeed", tb_dir);
  remove_proc_entry("lifthighspeed", tb_dir);
  remove_proc_entry("liftoperatorswitchbase", tb_dir);
  remove_proc_entry("liftoperatorswitchtop", tb_dir);
  remove_proc_entry("snowwatervalve1", tb_dir);
  remove_proc_entry("snowwatervalve2", tb_dir);
  remove_proc_entry("snowwatervalve3", tb_dir);
  remove_proc_entry("snowheater1", tb_dir);
  remove_proc_entry("trailblazer", NULL);
  
  printk(KERN_INFO "%s %s removed\n", MODULE_NAME, MODULE_VERSION);
}

module_init(init_liftmon_snowcon);
module_exit(cleanup_liftmon_snowcon);

MODULE_AUTHOR("Craig Hollabaugh");
MODULE_DESCRIPTION(
"Trailblazer Lift Monitor and Snowmaking Control for MediaEngine");

EXPORT_NO_SYMBOLS;