summaryrefslogtreecommitdiffstats
path: root/drivers/parport/procfs.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/parport/procfs.c')
-rw-r--r--drivers/parport/procfs.c638
1 files changed, 638 insertions, 0 deletions
diff --git a/drivers/parport/procfs.c b/drivers/parport/procfs.c
new file mode 100644
index 0000000000..4e5b972c3e
--- /dev/null
+++ b/drivers/parport/procfs.c
@@ -0,0 +1,638 @@
+// 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
+/*
+ * PARPORT_BASE_* is the size of the known parts of the sysctl path
+ * in dev/partport/%s/devices/%s. "dev/parport/"(12), "/devices/"(9
+ * and null char(1).
+ */
+#define PARPORT_BASE_PATH_SIZE 13
+#define PARPORT_BASE_DEVICES_PATH_SIZE 22
+
+static int do_active_device(struct ctl_table *table, int write,
+ void *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;
+ memcpy(result, buffer, len);
+ return 0;
+}
+
+#ifdef CONFIG_PARPORT_1284
+static int do_autoprobe(struct ctl_table *table, int write,
+ void *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;
+
+ memcpy(result, buffer, len);
+ return 0;
+}
+#endif /* IEEE1284.3 support. */
+
+static int do_hardware_base_addr(struct ctl_table *table, int write,
+ void *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;
+ memcpy(result, buffer, len);
+ return 0;
+}
+
+static int do_hardware_irq(struct ctl_table *table, int write,
+ void *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;
+ memcpy(result, buffer, len);
+ return 0;
+}
+
+static int do_hardware_dma(struct ctl_table *table, int write,
+ void *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;
+ memcpy(result, buffer, len);
+ return 0;
+}
+
+static int do_hardware_modes(struct ctl_table *table, int write,
+ void *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) \
+do { \
+ if (port->modes & PARPORT_MODE_##x) \
+ len += sprintf(buffer + len, "%s%s", f++ ? "," : "", #x); \
+} while (0)
+ 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;
+ memcpy(result, buffer, len);
+ return 0;
+}
+
+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 *port_header;
+ struct ctl_table_header *devices_header;
+ struct ctl_table vars[12];
+ struct ctl_table device_dir[2];
+};
+
+static const struct parport_sysctl_table parport_sysctl_template = {
+ .port_header = NULL,
+ .devices_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
+ },
+#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
+ },
+ {}
+ },
+};
+
+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,
+ },
+ {}
+ }
+};
+
+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
+ },
+ {}
+ }
+};
+
+int parport_proc_register(struct parport *port)
+{
+ struct parport_sysctl_table *t;
+ char *tmp_dir_path;
+ size_t tmp_path_len, port_name_len;
+ int bytes_written, i, err = 0;
+
+ t = kmemdup(&parport_sysctl_template, sizeof(*t), GFP_KERNEL);
+ if (t == NULL)
+ return -ENOMEM;
+
+ t->device_dir[0].extra1 = port;
+
+ t->vars[0].data = &port->spintime;
+ for (i = 0; i < 5; i++) {
+ t->vars[i].extra1 = port;
+ t->vars[5 + i].extra2 = &port->probe_info[i];
+ }
+
+ port_name_len = strnlen(port->name, PARPORT_NAME_MAX_LEN);
+ /*
+ * Allocate a buffer for two paths: dev/parport/PORT and dev/parport/PORT/devices.
+ * We calculate for the second as that will give us enough for the first.
+ */
+ tmp_path_len = PARPORT_BASE_DEVICES_PATH_SIZE + port_name_len;
+ tmp_dir_path = kzalloc(tmp_path_len, GFP_KERNEL);
+ if (!tmp_dir_path) {
+ err = -ENOMEM;
+ goto exit_free_t;
+ }
+
+ bytes_written = snprintf(tmp_dir_path, tmp_path_len,
+ "dev/parport/%s/devices", port->name);
+ if (tmp_path_len <= bytes_written) {
+ err = -ENOENT;
+ goto exit_free_tmp_dir_path;
+ }
+ t->devices_header = register_sysctl(tmp_dir_path, t->device_dir);
+ if (t->devices_header == NULL) {
+ err = -ENOENT;
+ goto exit_free_tmp_dir_path;
+ }
+
+ tmp_path_len = PARPORT_BASE_PATH_SIZE + port_name_len;
+ bytes_written = snprintf(tmp_dir_path, tmp_path_len,
+ "dev/parport/%s", port->name);
+ if (tmp_path_len <= bytes_written) {
+ err = -ENOENT;
+ goto unregister_devices_h;
+ }
+
+ t->port_header = register_sysctl(tmp_dir_path, t->vars);
+ if (t->port_header == NULL) {
+ err = -ENOENT;
+ goto unregister_devices_h;
+ }
+
+ port->sysctl_table = t;
+
+ kfree(tmp_dir_path);
+ return 0;
+
+unregister_devices_h:
+ unregister_sysctl_table(t->devices_header);
+
+exit_free_tmp_dir_path:
+ kfree(tmp_dir_path);
+
+exit_free_t:
+ kfree(t);
+ return err;
+}
+
+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->devices_header);
+ unregister_sysctl_table(t->port_header);
+ kfree(t);
+ }
+ return 0;
+}
+
+int parport_device_proc_register(struct pardevice *device)
+{
+ int bytes_written, err = 0;
+ struct parport_device_sysctl_table *t;
+ struct parport * port = device->port;
+ size_t port_name_len, device_name_len, tmp_dir_path_len;
+ char *tmp_dir_path;
+
+ t = kmemdup(&parport_device_sysctl_template, sizeof(*t), GFP_KERNEL);
+ if (t == NULL)
+ return -ENOMEM;
+
+ port_name_len = strnlen(port->name, PARPORT_NAME_MAX_LEN);
+ device_name_len = strnlen(device->name, PATH_MAX);
+
+ /* 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)
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-29 07:13:55 +0000