// 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)