/* Sysctl interface for parport devices.
   * 

   * Authors: David Campbell

   *          Tim Waugh <tim@cyberelk.demon.co.uk>
   *          Philip Blundell <philb@gnu.org>
   *          Andrea Arcangeli
   *          Riccardo Facchetti <fizban@tin.it>
   *
   * based on work by Grant Guenther <grant@torque.net>
   *              and Philip Blundell
   *
   * Cleaned up include files - Russell King <linux@arm.uk.linux.org>
   */
  
  #include <linux/string.h>

  #include <linux/init.h>
  #include <linux/module.h>
  #include <linux/errno.h>
  #include <linux/kernel.h>
  #include <linux/slab.h>
  #include <linux/parport.h>
  #include <linux/ctype.h>
  #include <linux/sysctl.h>
  
  #include <asm/uaccess.h>
  
  #if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS)
  
  #define PARPORT_MIN_TIMESLICE_VALUE 1ul 
  #define PARPORT_MAX_TIMESLICE_VALUE ((unsigned long) HZ)
  #define PARPORT_MIN_SPINTIME_VALUE 1
  #define PARPORT_MAX_SPINTIME_VALUE 1000

  static int do_active_device(ctl_table *table, int write,

  		      void __user *result, size_t *lenp, loff_t *ppos)
  {
  	struct parport *port = (struct parport *)table->extra1;
  	char buffer[256];
  	struct pardevice *dev;
  	int len = 0;
  
  	if (write)		/* can't happen anyway */
  		return -EACCES;
  
  	if (*ppos) {
  		*lenp = 0;
  		return 0;
  	}
  	
  	for (dev = port->devices; dev ; dev = dev->next) {
  		if(dev == port->cad) {
  			len += sprintf(buffer, "%s
  ", dev->name);
  		}
  	}
  
  	if(!len) {
  		len += sprintf(buffer, "%s
  ", "none");
  	}
  
  	if (len > *lenp)
  		len = *lenp;
  	else
  		*lenp = len;
  
  	*ppos += len;
  
  	return copy_to_user(result, buffer, len) ? -EFAULT : 0;
  }
  
  #ifdef CONFIG_PARPORT_1284

  static int do_autoprobe(ctl_table *table, int write,

  			void __user *result, size_t *lenp, loff_t *ppos)
  {
  	struct parport_device_info *info = table->extra2;
  	const char *str;
  	char buffer[256];
  	int len = 0;
  
  	if (write) /* permissions stop this */
  		return -EACCES;
  
  	if (*ppos) {
  		*lenp = 0;
  		return 0;
  	}
  	
  	if ((str = info->class_name) != NULL)
  		len += sprintf (buffer + len, "CLASS:%s;
  ", str);
  
  	if ((str = info->model) != NULL)
  		len += sprintf (buffer + len, "MODEL:%s;
  ", str);
  
  	if ((str = info->mfr) != NULL)
  		len += sprintf (buffer + len, "MANUFACTURER:%s;
  ", str);
  
  	if ((str = info->description) != NULL)
  		len += sprintf (buffer + len, "DESCRIPTION:%s;
  ", str);
  
  	if ((str = info->cmdset) != NULL)
  		len += sprintf (buffer + len, "COMMAND SET:%s;
  ", str);
  
  	if (len > *lenp)
  		len = *lenp;
  	else
  		*lenp = len;
  
  	*ppos += len;
  
  	return copy_to_user (result, buffer, len) ? -EFAULT : 0;
  }
  #endif /* IEEE1284.3 support. */
  
  static int do_hardware_base_addr (ctl_table *table, int write,

  				  void __user *result,

  				  size_t *lenp, loff_t *ppos)
  {
  	struct parport *port = (struct parport *)table->extra1;
  	char buffer[20];
  	int len = 0;
  
  	if (*ppos) {
  		*lenp = 0;
  		return 0;
  	}
  
  	if (write) /* permissions prevent this anyway */
  		return -EACCES;
  
  	len += sprintf (buffer, "%lu\t%lu
  ", port->base, port->base_hi);
  
  	if (len > *lenp)
  		len = *lenp;
  	else
  		*lenp = len;
  
  	*ppos += len;
  
  	return copy_to_user(result, buffer, len) ? -EFAULT : 0;
  }
  
  static int do_hardware_irq (ctl_table *table, int write,

  			    void __user *result,

  			    size_t *lenp, loff_t *ppos)
  {
  	struct parport *port = (struct parport *)table->extra1;
  	char buffer[20];
  	int len = 0;
  
  	if (*ppos) {
  		*lenp = 0;
  		return 0;
  	}
  
  	if (write) /* permissions prevent this anyway */
  		return -EACCES;
  
  	len += sprintf (buffer, "%d
  ", port->irq);
  
  	if (len > *lenp)
  		len = *lenp;
  	else
  		*lenp = len;
  
  	*ppos += len;
  
  	return copy_to_user(result, buffer, len) ? -EFAULT : 0;
  }
  
  static int do_hardware_dma (ctl_table *table, int write,

  			    void __user *result,

  			    size_t *lenp, loff_t *ppos)
  {
  	struct parport *port = (struct parport *)table->extra1;
  	char buffer[20];
  	int len = 0;
  
  	if (*ppos) {
  		*lenp = 0;
  		return 0;
  	}
  
  	if (write) /* permissions prevent this anyway */
  		return -EACCES;
  
  	len += sprintf (buffer, "%d
  ", port->dma);
  
  	if (len > *lenp)
  		len = *lenp;
  	else
  		*lenp = len;
  
  	*ppos += len;
  
  	return copy_to_user(result, buffer, len) ? -EFAULT : 0;
  }
  
  static int do_hardware_modes (ctl_table *table, int write,

  			      void __user *result,

  			      size_t *lenp, loff_t *ppos)
  {
  	struct parport *port = (struct parport *)table->extra1;
  	char buffer[40];
  	int len = 0;
  
  	if (*ppos) {
  		*lenp = 0;
  		return 0;
  	}
  
  	if (write) /* permissions prevent this anyway */
  		return -EACCES;
  
  	{
  #define printmode(x) {if(port->modes&PARPORT_MODE_##x){len+=sprintf(buffer+len,"%s%s",f?",":"",#x);f++;}}
  		int f = 0;
  		printmode(PCSPP);
  		printmode(TRISTATE);
  		printmode(COMPAT);
  		printmode(EPP);
  		printmode(ECP);
  		printmode(DMA);
  #undef printmode
  	}
  	buffer[len++] = '
  ';
  
  	if (len > *lenp)
  		len = *lenp;
  	else
  		*lenp = len;
  
  	*ppos += len;
  
  	return copy_to_user(result, buffer, len) ? -EFAULT : 0;
  }

  #define PARPORT_PORT_DIR(CHILD) { .procname = NULL, .mode = 0555, .child = CHILD }
  #define PARPORT_PARPORT_DIR(CHILD) { .procname = "parport", \

                                       .mode = 0555, .child = CHILD }

  #define PARPORT_DEV_DIR(CHILD) { .procname = "dev", .mode = 0555, .child = CHILD }

  #define PARPORT_DEVICES_ROOT_DIR  {  .procname = "devices", \

                                      .mode = 0555, .child = NULL }

  
  static const unsigned long parport_min_timeslice_value =
  PARPORT_MIN_TIMESLICE_VALUE;
  
  static const unsigned long parport_max_timeslice_value =
  PARPORT_MAX_TIMESLICE_VALUE;
  
  static const  int parport_min_spintime_value =
  PARPORT_MIN_SPINTIME_VALUE;
  
  static const int parport_max_spintime_value =
  PARPORT_MAX_SPINTIME_VALUE;
  
  
  struct parport_sysctl_table {
  	struct ctl_table_header *sysctl_header;
  	ctl_table vars[12];
  	ctl_table device_dir[2];
  	ctl_table port_dir[2];
  	ctl_table parport_dir[2];
  	ctl_table dev_dir[2];
  };
  
  static const struct parport_sysctl_table parport_sysctl_template = {

  	.sysctl_header = NULL,

          {

  		{

  			.procname	= "spintime",
  			.data		= NULL,
  			.maxlen		= sizeof(int),
  			.mode		= 0644,

  			.proc_handler	= proc_dointvec_minmax,

  			.extra1		= (void*) &parport_min_spintime_value,
  			.extra2		= (void*) &parport_max_spintime_value
  		},
  		{

  			.procname	= "base-addr",
  			.data		= NULL,
  			.maxlen		= 0,
  			.mode		= 0444,

  			.proc_handler	= do_hardware_base_addr

  		},
  		{

  			.procname	= "irq",
  			.data		= NULL,
  			.maxlen		= 0,
  			.mode		= 0444,

  			.proc_handler	= do_hardware_irq

  		},
  		{

  			.procname	= "dma",
  			.data		= NULL,
  			.maxlen		= 0,
  			.mode		= 0444,

  			.proc_handler	= do_hardware_dma

  		},
  		{

  			.procname	= "modes",
  			.data		= NULL,
  			.maxlen		= 0,
  			.mode		= 0444,

  			.proc_handler	= do_hardware_modes

  		},

  		PARPORT_DEVICES_ROOT_DIR,
  #ifdef CONFIG_PARPORT_1284

  		{

  			.procname	= "autoprobe",
  			.data		= NULL,
  			.maxlen		= 0,
  			.mode		= 0444,

  			.proc_handler	= do_autoprobe

  		},
  		{

  			.procname	= "autoprobe0",
  			.data		= NULL,
  			.maxlen		= 0,
  			.mode		= 0444,

  			.proc_handler	= do_autoprobe

  		},
  		{

  			.procname	= "autoprobe1",
  			.data		= NULL,
  			.maxlen		= 0,
  			.mode		= 0444,

  			.proc_handler	= do_autoprobe

  		},
  		{

  			.procname	= "autoprobe2",
  			.data		= NULL,
  			.maxlen		= 0,
  			.mode		= 0444,

  			.proc_handler	= do_autoprobe

  		},
  		{

  			.procname	= "autoprobe3",
  			.data		= NULL,
  			.maxlen		= 0,
  			.mode		= 0444,

  			.proc_handler	= do_autoprobe

  		},

  #endif /* IEEE 1284 support */

  		{}

  	},

  	{
  		{

  			.procname	= "active",
  			.data		= NULL,
  			.maxlen		= 0,
  			.mode		= 0444,

  			.proc_handler	= do_active_device

  		},
  		{}
  	},
  	{
  		PARPORT_PORT_DIR(NULL),
  		{}
  	},
  	{
  		PARPORT_PARPORT_DIR(NULL),
  		{}
  	},
  	{
  		PARPORT_DEV_DIR(NULL),
  		{}
  	}

  };
  
  struct parport_device_sysctl_table
  {
  	struct ctl_table_header *sysctl_header;
  	ctl_table vars[2];
  	ctl_table device_dir[2];
  	ctl_table devices_root_dir[2];
  	ctl_table port_dir[2];
  	ctl_table parport_dir[2];
  	ctl_table dev_dir[2];
  };
  
  static const struct parport_device_sysctl_table
  parport_device_sysctl_template = {

  	.sysctl_header = NULL,
  	{
  		{

  			.procname 	= "timeslice",
  			.data		= NULL,

  			.maxlen		= sizeof(unsigned long),

  			.mode		= 0644,

  			.proc_handler	= proc_doulongvec_ms_jiffies_minmax,

  			.extra1		= (void*) &parport_min_timeslice_value,
  			.extra2		= (void*) &parport_max_timeslice_value
  		},
  	},
  	{
  		{

  			.procname	= NULL,
  			.data		= NULL,
  			.maxlen		= 0,
  			.mode		= 0555,
  			.child		= NULL
  		},
  		{}
  	},

  	{

  		PARPORT_DEVICES_ROOT_DIR,
  		{}
  	},
  	{
  		PARPORT_PORT_DIR(NULL),
  		{}

  	},

  	{
  		PARPORT_PARPORT_DIR(NULL),
  		{}
  	},
  	{
  		PARPORT_DEV_DIR(NULL),
  		{}
  	}

  };
  
  struct parport_default_sysctl_table
  {
  	struct ctl_table_header *sysctl_header;
  	ctl_table vars[3];
          ctl_table default_dir[2];
  	ctl_table parport_dir[2];
  	ctl_table dev_dir[2];
  };

  static struct parport_default_sysctl_table
  parport_default_sysctl_table = {

  	.sysctl_header	= NULL,
  	{
  		{

  			.procname	= "timeslice",
  			.data		= &parport_default_timeslice,
  			.maxlen		= sizeof(parport_default_timeslice),
  			.mode		= 0644,

  			.proc_handler	= proc_doulongvec_ms_jiffies_minmax,

  			.extra1		= (void*) &parport_min_timeslice_value,
  			.extra2		= (void*) &parport_max_timeslice_value
  		},
  		{

  			.procname	= "spintime",
  			.data		= &parport_default_spintime,
  			.maxlen		= sizeof(parport_default_spintime),
  			.mode		= 0644,

  			.proc_handler	= proc_dointvec_minmax,

  			.extra1		= (void*) &parport_min_spintime_value,
  			.extra2		= (void*) &parport_max_spintime_value
  		},
  		{}
  	},

  	{

  		{

  			.procname	= "default",
  			.mode		= 0555,
  			.child		= parport_default_sysctl_table.vars
  		},
  		{}

  	},

  	{

  		PARPORT_PARPORT_DIR(parport_default_sysctl_table.default_dir),
  		{}
  	},
  	{
  		PARPORT_DEV_DIR(parport_default_sysctl_table.parport_dir),
  		{}
  	}

  };
  
  
  int parport_proc_register(struct parport *port)
  {
  	struct parport_sysctl_table *t;
  	int i;
  
  	t = kmalloc(sizeof(*t), GFP_KERNEL);
  	if (t == NULL)
  		return -ENOMEM;
  	memcpy(t, &parport_sysctl_template, sizeof(*t));
  
  	t->device_dir[0].extra1 = port;

  	for (i = 0; i < 5; i++)

  		t->vars[i].extra1 = port;
  
  	t->vars[0].data = &port->spintime;
  	t->vars[5].child = t->device_dir;
  	
  	for (i = 0; i < 5; i++)
  		t->vars[6 + i].extra2 = &port->probe_info[i];
  
  	t->port_dir[0].procname = port->name;

  
  	t->port_dir[0].child = t->vars;
  	t->parport_dir[0].child = t->port_dir;
  	t->dev_dir[0].child = t->parport_dir;

  	t->sysctl_header = register_sysctl_table(t->dev_dir);

  	if (t->sysctl_header == NULL) {
  		kfree(t);
  		t = NULL;
  	}
  	port->sysctl_table = t;
  	return 0;
  }
  
  int parport_proc_unregister(struct parport *port)
  {
  	if (port->sysctl_table) {
  		struct parport_sysctl_table *t = port->sysctl_table;
  		port->sysctl_table = NULL;
  		unregister_sysctl_table(t->sysctl_header);
  		kfree(t);
  	}
  	return 0;
  }
  
  int parport_device_proc_register(struct pardevice *device)
  {
  	struct parport_device_sysctl_table *t;
  	struct parport * port = device->port;
  	
  	t = kmalloc(sizeof(*t), GFP_KERNEL);
  	if (t == NULL)
  		return -ENOMEM;
  	memcpy(t, &parport_device_sysctl_template, sizeof(*t));
  
  	t->dev_dir[0].child = t->parport_dir;
  	t->parport_dir[0].child = t->port_dir;
  	t->port_dir[0].procname = port->name;

  	t->port_dir[0].child = t->devices_root_dir;
  	t->devices_root_dir[0].child = t->device_dir;

  	t->device_dir[0].procname = device->name;

  	t->device_dir[0].child = t->vars;
  	t->vars[0].data = &device->timeslice;

  	t->sysctl_header = register_sysctl_table(t->dev_dir);

  	if (t->sysctl_header == NULL) {
  		kfree(t);
  		t = NULL;
  	}
  	device->sysctl_table = t;
  	return 0;
  }
  
  int parport_device_proc_unregister(struct pardevice *device)
  {
  	if (device->sysctl_table) {
  		struct parport_device_sysctl_table *t = device->sysctl_table;
  		device->sysctl_table = NULL;
  		unregister_sysctl_table(t->sysctl_header);
  		kfree(t);
  	}
  	return 0;
  }
  
  static int __init parport_default_proc_register(void)
  {
  	parport_default_sysctl_table.sysctl_header =

  		register_sysctl_table(parport_default_sysctl_table.dev_dir);

  	return 0;
  }
  
  static void __exit parport_default_proc_unregister(void)
  {
  	if (parport_default_sysctl_table.sysctl_header) {
  		unregister_sysctl_table(parport_default_sysctl_table.
  					sysctl_header);
  		parport_default_sysctl_table.sysctl_header = NULL;
  	}
  }
  
  #else /* no sysctl or no procfs*/
  
  int parport_proc_register(struct parport *pp)
  {
  	return 0;
  }
  
  int parport_proc_unregister(struct parport *pp)
  {
  	return 0;
  }
  
  int parport_device_proc_register(struct pardevice *device)
  {
  	return 0;
  }
  
  int parport_device_proc_unregister(struct pardevice *device)
  {
  	return 0;
  }
  
  static int __init parport_default_proc_register (void)
  {
  	return 0;
  }
  
  static void __exit parport_default_proc_unregister (void)
  {
  }
  #endif
  
  module_init(parport_default_proc_register)
  module_exit(parport_default_proc_unregister)