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2f2665c13a
This is part of the effort to remove the empty element at the end of ctl_table structs. "child" was a deprecated elem in this struct and was being used to differentiate between two types of ctl_tables: "normal" and "permanently emtpy". What changed?: * Replace "child" with an enumeration that will have two values: the default (0) and the permanently empty (1). The latter is left at zero so when struct ctl_table is created with kzalloc or in a local context, it will have the zero value by default. We document the new enum with kdoc. * Remove the "empty child" check from sysctl_check_table * Remove count_subheaders function as there is no longer a need to calculate how many headers there are for every child * Remove the recursive call to unregister_sysctl_table as there is no need to traverse down the child tree any longer * Add a new SYSCTL_PERM_EMPTY_DIR binary flag * Remove the last remanence of child from partport/procfs.c Signed-off-by: Joel Granados <j.granados@samsung.com> Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
638 lines
13 KiB
C
638 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Sysctl interface for parport devices.
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*
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* Authors: David Campbell
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* Tim Waugh <tim@cyberelk.demon.co.uk>
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* Philip Blundell <philb@gnu.org>
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* Andrea Arcangeli
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* Riccardo Facchetti <fizban@tin.it>
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*
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* based on work by Grant Guenther <grant@torque.net>
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* and Philip Blundell
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*
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* Cleaned up include files - Russell King <linux@arm.uk.linux.org>
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*/
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#include <linux/string.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/parport.h>
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#include <linux/ctype.h>
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#include <linux/sysctl.h>
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#include <linux/device.h>
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#include <linux/uaccess.h>
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#if defined(CONFIG_SYSCTL) && defined(CONFIG_PROC_FS)
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#define PARPORT_MIN_TIMESLICE_VALUE 1ul
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#define PARPORT_MAX_TIMESLICE_VALUE ((unsigned long) HZ)
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#define PARPORT_MIN_SPINTIME_VALUE 1
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#define PARPORT_MAX_SPINTIME_VALUE 1000
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/*
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* PARPORT_BASE_* is the size of the known parts of the sysctl path
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* in dev/partport/%s/devices/%s. "dev/parport/"(12), "/devices/"(9
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* and null char(1).
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*/
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#define PARPORT_BASE_PATH_SIZE 13
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#define PARPORT_BASE_DEVICES_PATH_SIZE 22
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static int do_active_device(struct ctl_table *table, int write,
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void *result, size_t *lenp, loff_t *ppos)
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{
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struct parport *port = (struct parport *)table->extra1;
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char buffer[256];
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struct pardevice *dev;
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int len = 0;
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if (write) /* can't happen anyway */
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return -EACCES;
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if (*ppos) {
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*lenp = 0;
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return 0;
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}
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for (dev = port->devices; dev ; dev = dev->next) {
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if(dev == port->cad) {
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len += sprintf(buffer, "%s\n", dev->name);
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}
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}
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if(!len) {
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len += sprintf(buffer, "%s\n", "none");
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}
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if (len > *lenp)
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len = *lenp;
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else
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*lenp = len;
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*ppos += len;
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memcpy(result, buffer, len);
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return 0;
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}
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#ifdef CONFIG_PARPORT_1284
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static int do_autoprobe(struct ctl_table *table, int write,
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void *result, size_t *lenp, loff_t *ppos)
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{
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struct parport_device_info *info = table->extra2;
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const char *str;
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char buffer[256];
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int len = 0;
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if (write) /* permissions stop this */
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return -EACCES;
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if (*ppos) {
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*lenp = 0;
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return 0;
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}
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if ((str = info->class_name) != NULL)
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len += sprintf (buffer + len, "CLASS:%s;\n", str);
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if ((str = info->model) != NULL)
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len += sprintf (buffer + len, "MODEL:%s;\n", str);
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if ((str = info->mfr) != NULL)
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len += sprintf (buffer + len, "MANUFACTURER:%s;\n", str);
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if ((str = info->description) != NULL)
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len += sprintf (buffer + len, "DESCRIPTION:%s;\n", str);
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if ((str = info->cmdset) != NULL)
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len += sprintf (buffer + len, "COMMAND SET:%s;\n", str);
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if (len > *lenp)
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len = *lenp;
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else
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*lenp = len;
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*ppos += len;
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memcpy(result, buffer, len);
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return 0;
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}
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#endif /* IEEE1284.3 support. */
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static int do_hardware_base_addr(struct ctl_table *table, int write,
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void *result, size_t *lenp, loff_t *ppos)
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{
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struct parport *port = (struct parport *)table->extra1;
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char buffer[20];
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int len = 0;
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if (*ppos) {
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*lenp = 0;
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return 0;
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}
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if (write) /* permissions prevent this anyway */
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return -EACCES;
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len += sprintf (buffer, "%lu\t%lu\n", port->base, port->base_hi);
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if (len > *lenp)
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len = *lenp;
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else
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*lenp = len;
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*ppos += len;
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memcpy(result, buffer, len);
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return 0;
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}
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static int do_hardware_irq(struct ctl_table *table, int write,
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void *result, size_t *lenp, loff_t *ppos)
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{
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struct parport *port = (struct parport *)table->extra1;
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char buffer[20];
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int len = 0;
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if (*ppos) {
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*lenp = 0;
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return 0;
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}
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if (write) /* permissions prevent this anyway */
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return -EACCES;
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len += sprintf (buffer, "%d\n", port->irq);
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if (len > *lenp)
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len = *lenp;
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else
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*lenp = len;
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*ppos += len;
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memcpy(result, buffer, len);
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return 0;
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}
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static int do_hardware_dma(struct ctl_table *table, int write,
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void *result, size_t *lenp, loff_t *ppos)
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{
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struct parport *port = (struct parport *)table->extra1;
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char buffer[20];
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int len = 0;
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if (*ppos) {
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*lenp = 0;
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return 0;
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}
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if (write) /* permissions prevent this anyway */
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return -EACCES;
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len += sprintf (buffer, "%d\n", port->dma);
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if (len > *lenp)
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len = *lenp;
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else
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*lenp = len;
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*ppos += len;
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memcpy(result, buffer, len);
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return 0;
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}
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static int do_hardware_modes(struct ctl_table *table, int write,
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void *result, size_t *lenp, loff_t *ppos)
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{
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struct parport *port = (struct parport *)table->extra1;
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char buffer[40];
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int len = 0;
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if (*ppos) {
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*lenp = 0;
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return 0;
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}
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if (write) /* permissions prevent this anyway */
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return -EACCES;
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{
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#define printmode(x) \
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do { \
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if (port->modes & PARPORT_MODE_##x) \
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len += sprintf(buffer + len, "%s%s", f++ ? "," : "", #x); \
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} while (0)
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int f = 0;
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printmode(PCSPP);
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printmode(TRISTATE);
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printmode(COMPAT);
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printmode(EPP);
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printmode(ECP);
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printmode(DMA);
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#undef printmode
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}
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buffer[len++] = '\n';
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if (len > *lenp)
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len = *lenp;
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else
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*lenp = len;
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*ppos += len;
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memcpy(result, buffer, len);
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return 0;
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}
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static const unsigned long parport_min_timeslice_value =
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PARPORT_MIN_TIMESLICE_VALUE;
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static const unsigned long parport_max_timeslice_value =
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PARPORT_MAX_TIMESLICE_VALUE;
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static const int parport_min_spintime_value =
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PARPORT_MIN_SPINTIME_VALUE;
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static const int parport_max_spintime_value =
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PARPORT_MAX_SPINTIME_VALUE;
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struct parport_sysctl_table {
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struct ctl_table_header *port_header;
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struct ctl_table_header *devices_header;
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struct ctl_table vars[12];
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struct ctl_table device_dir[2];
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};
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static const struct parport_sysctl_table parport_sysctl_template = {
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.port_header = NULL,
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.devices_header = NULL,
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{
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{
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.procname = "spintime",
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.data = NULL,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = (void*) &parport_min_spintime_value,
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.extra2 = (void*) &parport_max_spintime_value
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},
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{
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.procname = "base-addr",
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.data = NULL,
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.maxlen = 0,
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.mode = 0444,
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.proc_handler = do_hardware_base_addr
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},
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{
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.procname = "irq",
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.data = NULL,
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.maxlen = 0,
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.mode = 0444,
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.proc_handler = do_hardware_irq
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},
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{
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.procname = "dma",
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.data = NULL,
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.maxlen = 0,
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.mode = 0444,
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.proc_handler = do_hardware_dma
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},
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{
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.procname = "modes",
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.data = NULL,
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.maxlen = 0,
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.mode = 0444,
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.proc_handler = do_hardware_modes
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},
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#ifdef CONFIG_PARPORT_1284
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{
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.procname = "autoprobe",
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.data = NULL,
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.maxlen = 0,
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.mode = 0444,
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.proc_handler = do_autoprobe
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},
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{
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.procname = "autoprobe0",
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.data = NULL,
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.maxlen = 0,
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.mode = 0444,
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.proc_handler = do_autoprobe
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},
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{
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.procname = "autoprobe1",
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.data = NULL,
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.maxlen = 0,
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.mode = 0444,
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.proc_handler = do_autoprobe
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},
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{
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.procname = "autoprobe2",
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.data = NULL,
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.maxlen = 0,
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.mode = 0444,
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.proc_handler = do_autoprobe
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},
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{
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.procname = "autoprobe3",
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.data = NULL,
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.maxlen = 0,
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.mode = 0444,
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.proc_handler = do_autoprobe
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},
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#endif /* IEEE 1284 support */
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{}
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},
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{
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{
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.procname = "active",
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.data = NULL,
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.maxlen = 0,
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.mode = 0444,
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.proc_handler = do_active_device
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},
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{}
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},
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};
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struct parport_device_sysctl_table
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{
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struct ctl_table_header *sysctl_header;
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struct ctl_table vars[2];
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struct ctl_table device_dir[2];
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struct ctl_table devices_root_dir[2];
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struct ctl_table port_dir[2];
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struct ctl_table parport_dir[2];
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struct ctl_table dev_dir[2];
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};
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static const struct parport_device_sysctl_table
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parport_device_sysctl_template = {
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.sysctl_header = NULL,
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{
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{
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.procname = "timeslice",
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.data = NULL,
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.maxlen = sizeof(unsigned long),
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.mode = 0644,
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.proc_handler = proc_doulongvec_ms_jiffies_minmax,
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.extra1 = (void*) &parport_min_timeslice_value,
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.extra2 = (void*) &parport_max_timeslice_value
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},
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{}
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},
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{
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{
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.procname = NULL,
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.data = NULL,
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.maxlen = 0,
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.mode = 0555,
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},
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{}
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}
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};
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struct parport_default_sysctl_table
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{
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struct ctl_table_header *sysctl_header;
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struct ctl_table vars[3];
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struct ctl_table default_dir[2];
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struct ctl_table parport_dir[2];
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struct ctl_table dev_dir[2];
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};
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static struct parport_default_sysctl_table
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parport_default_sysctl_table = {
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.sysctl_header = NULL,
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{
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{
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.procname = "timeslice",
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.data = &parport_default_timeslice,
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.maxlen = sizeof(parport_default_timeslice),
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.mode = 0644,
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.proc_handler = proc_doulongvec_ms_jiffies_minmax,
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.extra1 = (void*) &parport_min_timeslice_value,
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.extra2 = (void*) &parport_max_timeslice_value
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},
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{
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.procname = "spintime",
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.data = &parport_default_spintime,
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.maxlen = sizeof(parport_default_spintime),
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.mode = 0644,
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.proc_handler = proc_dointvec_minmax,
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.extra1 = (void*) &parport_min_spintime_value,
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.extra2 = (void*) &parport_max_spintime_value
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},
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{}
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}
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};
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int parport_proc_register(struct parport *port)
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{
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struct parport_sysctl_table *t;
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char *tmp_dir_path;
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size_t tmp_path_len, port_name_len;
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int bytes_written, i, err = 0;
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t = kmemdup(&parport_sysctl_template, sizeof(*t), GFP_KERNEL);
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if (t == NULL)
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return -ENOMEM;
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t->device_dir[0].extra1 = port;
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t->vars[0].data = &port->spintime;
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for (i = 0; i < 5; i++) {
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t->vars[i].extra1 = port;
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t->vars[5 + i].extra2 = &port->probe_info[i];
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}
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port_name_len = strnlen(port->name, PARPORT_NAME_MAX_LEN);
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/*
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* Allocate a buffer for two paths: dev/parport/PORT and dev/parport/PORT/devices.
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* We calculate for the second as that will give us enough for the first.
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*/
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tmp_path_len = PARPORT_BASE_DEVICES_PATH_SIZE + port_name_len;
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tmp_dir_path = kzalloc(tmp_path_len, GFP_KERNEL);
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if (!tmp_dir_path) {
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err = -ENOMEM;
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goto exit_free_t;
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}
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bytes_written = snprintf(tmp_dir_path, tmp_path_len,
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"dev/parport/%s/devices", port->name);
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if (tmp_path_len <= bytes_written) {
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err = -ENOENT;
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goto exit_free_tmp_dir_path;
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}
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t->devices_header = register_sysctl(tmp_dir_path, t->device_dir);
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if (t->devices_header == NULL) {
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err = -ENOENT;
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goto exit_free_tmp_dir_path;
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}
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tmp_path_len = PARPORT_BASE_PATH_SIZE + port_name_len;
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bytes_written = snprintf(tmp_dir_path, tmp_path_len,
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"dev/parport/%s", port->name);
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if (tmp_path_len <= bytes_written) {
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err = -ENOENT;
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goto unregister_devices_h;
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}
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t->port_header = register_sysctl(tmp_dir_path, t->vars);
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if (t->port_header == NULL) {
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err = -ENOENT;
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goto unregister_devices_h;
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}
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port->sysctl_table = t;
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kfree(tmp_dir_path);
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return 0;
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unregister_devices_h:
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unregister_sysctl_table(t->devices_header);
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exit_free_tmp_dir_path:
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kfree(tmp_dir_path);
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exit_free_t:
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kfree(t);
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return err;
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}
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int parport_proc_unregister(struct parport *port)
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{
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if (port->sysctl_table) {
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struct parport_sysctl_table *t = port->sysctl_table;
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port->sysctl_table = NULL;
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unregister_sysctl_table(t->devices_header);
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unregister_sysctl_table(t->port_header);
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kfree(t);
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}
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return 0;
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}
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int parport_device_proc_register(struct pardevice *device)
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{
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int bytes_written, err = 0;
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struct parport_device_sysctl_table *t;
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struct parport * port = device->port;
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size_t port_name_len, device_name_len, tmp_dir_path_len;
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char *tmp_dir_path;
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t = kmemdup(&parport_device_sysctl_template, sizeof(*t), GFP_KERNEL);
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if (t == NULL)
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return -ENOMEM;
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port_name_len = strnlen(port->name, PARPORT_NAME_MAX_LEN);
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device_name_len = strnlen(device->name, PATH_MAX);
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/* Allocate a buffer for two paths: dev/parport/PORT/devices/DEVICE. */
|
|
tmp_dir_path_len = PARPORT_BASE_DEVICES_PATH_SIZE + port_name_len + device_name_len;
|
|
tmp_dir_path = kzalloc(tmp_dir_path_len, GFP_KERNEL);
|
|
if (!tmp_dir_path) {
|
|
err = -ENOMEM;
|
|
goto exit_free_t;
|
|
}
|
|
|
|
bytes_written = snprintf(tmp_dir_path, tmp_dir_path_len, "dev/parport/%s/devices/%s",
|
|
port->name, device->name);
|
|
if (tmp_dir_path_len <= bytes_written) {
|
|
err = -ENOENT;
|
|
goto exit_free_path;
|
|
}
|
|
|
|
t->vars[0].data = &device->timeslice;
|
|
|
|
t->sysctl_header = register_sysctl(tmp_dir_path, t->vars);
|
|
if (t->sysctl_header == NULL) {
|
|
kfree(t);
|
|
t = NULL;
|
|
}
|
|
device->sysctl_table = t;
|
|
|
|
kfree(tmp_dir_path);
|
|
return 0;
|
|
|
|
exit_free_path:
|
|
kfree(tmp_dir_path);
|
|
|
|
exit_free_t:
|
|
kfree(t);
|
|
|
|
return err;
|
|
}
|
|
|
|
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)
|
|
{
|
|
int ret;
|
|
|
|
parport_default_sysctl_table.sysctl_header =
|
|
register_sysctl("dev/parport/default", parport_default_sysctl_table.vars);
|
|
if (!parport_default_sysctl_table.sysctl_header)
|
|
return -ENOMEM;
|
|
ret = parport_bus_init();
|
|
if (ret) {
|
|
unregister_sysctl_table(parport_default_sysctl_table.
|
|
sysctl_header);
|
|
return ret;
|
|
}
|
|
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;
|
|
}
|
|
parport_bus_exit();
|
|
}
|
|
|
|
#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 parport_bus_init();
|
|
}
|
|
|
|
static void __exit parport_default_proc_unregister (void)
|
|
{
|
|
parport_bus_exit();
|
|
}
|
|
#endif
|
|
|
|
subsys_initcall(parport_default_proc_register)
|
|
module_exit(parport_default_proc_unregister)
|