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linux/drivers/parport/procfs.c
Eric W. Biederman 6d4561110a sysctl: Drop & in front of every proc_handler. 
For consistency drop & in front of every proc_handler.  Explicity
taking the address is unnecessary and it prevents optimizations
like stubbing the proc_handlers to NULL.

Cc: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
2009-11-18 08:37:40 -08:00

610 lines
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/* 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\n", dev->name);
}
}
if(!len) {
len += sprintf(buffer, "%s\n", "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;\n", str);
if ((str = info->model) != NULL)
len += sprintf (buffer + len, "MODEL:%s;\n", str);
if ((str = info->mfr) != NULL)
len += sprintf (buffer + len, "MANUFACTURER:%s;\n", str);
if ((str = info->description) != NULL)
len += sprintf (buffer + len, "DESCRIPTION:%s;\n", str);
if ((str = info->cmdset) != NULL)
len += sprintf (buffer + len, "COMMAND SET:%s;\n", 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\n", 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\n", 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\n", 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++] = '\n';
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)
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