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- // SPDX-License-Identifier: GPL-2.0
- /* 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 <linux/device.h>
- #include <linux/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(struct 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(struct 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(struct 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(struct 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(struct 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(struct 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;
- struct ctl_table vars[12];
- struct ctl_table device_dir[2];
- struct ctl_table port_dir[2];
- struct ctl_table parport_dir[2];
- struct 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;
- struct ctl_table vars[2];
- struct ctl_table device_dir[2];
- struct ctl_table devices_root_dir[2];
- struct ctl_table port_dir[2];
- struct ctl_table parport_dir[2];
- struct 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;
- struct ctl_table vars[3];
- struct ctl_table default_dir[2];
- struct ctl_table parport_dir[2];
- struct 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 = kmemdup(&parport_sysctl_template, sizeof(*t), GFP_KERNEL);
- if (t == NULL)
- return -ENOMEM;
- 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 = kmemdup(&parport_device_sysctl_template, sizeof(*t), GFP_KERNEL);
- if (t == NULL)
- return -ENOMEM;
- 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)
- {
- int ret;
- parport_default_sysctl_table.sysctl_header =
- register_sysctl_table(parport_default_sysctl_table.dev_dir);
- 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)
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