-/* proc.c
- * Linux CAN-bus device driver.
- * Written by Arnaud Westenberg email:arnaud@wanadoo.nl
- * Rewritten for new CAN queues by Pavel Pisa - OCERA team member
- * email:pisa@cmp.felk.cvut.cz
- * This software is released under the GPL-License.
- * Version lincan-0.3 17 Jun 2004
- */
+/**************************************************************************/
+/* File: proc.c - proc filesystem entries for CAN driver */
+/* */
+/* LinCAN - (Not only) Linux CAN bus driver */
+/* Copyright (C) 2002-2009 DCE FEE CTU Prague <http://dce.felk.cvut.cz> */
+/* Copyright (C) 2002-2009 Pavel Pisa <pisa@cmp.felk.cvut.cz> */
+/* Funded by OCERA and FRESCOR IST projects */
+/* Based on CAN driver code by Arnaud Westenberg <arnaud@wanadoo.nl> */
+/* */
+/* LinCAN is free software; you can redistribute it and/or modify it */
+/* under terms of the GNU General Public License as published by the */
+/* Free Software Foundation; either version 2, or (at your option) any */
+/* later version. LinCAN is distributed in the hope that it will be */
+/* useful, but WITHOUT ANY WARRANTY; without even the implied warranty */
+/* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU */
+/* General Public License for more details. You should have received a */
+/* copy of the GNU General Public License along with LinCAN; see file */
+/* COPYING. If not, write to the Free Software Foundation, 675 Mass Ave, */
+/* Cambridge, MA 02139, USA. */
+/* */
+/* To allow use of LinCAN in the compact embedded systems firmware */
+/* and RT-executives (RTEMS for example), main authors agree with next */
+/* special exception: */
+/* */
+/* Including LinCAN header files in a file, instantiating LinCAN generics */
+/* or templates, or linking other files with LinCAN objects to produce */
+/* an application image/executable, does not by itself cause the */
+/* resulting application image/executable to be covered by */
+/* the GNU General Public License. */
+/* This exception does not however invalidate any other reasons */
+/* why the executable file might be covered by the GNU Public License. */
+/* Publication of enhanced or derived LinCAN files is required although. */
+/**************************************************************************/
#include "../include/can.h"
#include "../include/can_sysdep.h"
#define __NO_VERSION__
#include <linux/module.h>
+#include <linux/mutex.h>
int add_channel_to_procdir(struct candevice_t *candev);
-int remove_channel_from_procdir(void);
+int remove_channels_from_procdir(void);
+int remove_channel_from_procdir(struct candevice_t *candev);
int add_object_to_procdir(int chip_nr);
int remove_object_from_procdir(int chip_nr);
static struct canproc_t can_proc_base;
static struct canproc_t *base=&can_proc_base;
+DEFINE_MUTEX(proc_mutex); /* synchronize access to canproc_t array */
-/* The following functions are needed only for kernel version 2.2. Kernel
- * version 2.4 already defines them for us.
- */
-#if (LINUX_VERSION_CODE <= KERNEL_VERSION(2,3,0))
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,10,0))
+
+#include <linux/seq_file.h>
+
+#define CAN_PROC_SHOW_SINGLE_OPS_DECLARE(ops_name, show_function) \
+static int ops_name##_open(struct inode *inode, struct file *file) \
+{ \
+ return single_open(file, show_function, PDE_DATA(inode)); \
+} \
+static const struct file_operations ops_name = { \
+ .owner = THIS_MODULE, \
+ .open = ops_name##_open, \
+ .read = seq_read, \
+ .llseek = seq_lseek, \
+ .release = single_release, \
+};
+
+typedef struct file_operations can_proc_read_entry_ops_t;
+typedef struct seq_file can_proc_seq_file_t;
+
+static inline void *can_seq_data(can_proc_seq_file_t *sqf)
+{
+ return sqf->private;
+}
+
+#define can_seq_printf seq_printf
+
+struct proc_dir_entry *can_create_proc_read_entry(const char *name,
+ mode_t mode, struct proc_dir_entry *parent,
+ const can_proc_read_entry_ops_t *proc_read_entry_ops, void * data)
+{
+ return proc_create_data(name, mode, parent, proc_read_entry_ops, data);
+}
+
+struct proc_dir_entry *can_proc_mkdir_mode(const char *name, umode_t mode,
+ struct proc_dir_entry *parent)
+{
+ return proc_mkdir_mode(name, mode, parent);
+}
+
+static int can_proc_remove(struct proc_dir_entry *del)
+{
+ if(!del) return -ENODEV;
+ proc_remove(del);
+ return 0;
+}
+
+static inline struct proc_dir_entry *can_proc_symlink(const char *name,
+ struct proc_dir_entry *parent, const char *dest)
+{
+ return proc_symlink(name, parent, dest);
+}
+
+#else /* kernel older than 3.10 */
+
+typedef read_proc_t *can_proc_read_entry_ops_t;
+typedef struct {
+ int len;
+ int limit;
+ char *buf;
+ void *private;
+} can_proc_seq_file_t;
+
+#define CAN_PROC_SHOW_SINGLE_OPS_DECLARE(ops_name, show_function) \
+static int ops_name##_show_wrapper(char *buf, char **start, off_t offset, \
+ int count, int *eof, void *data) \
+{ \
+ can_proc_seq_file_t seq_pos = { .len = 0, .buf = buf, .limit = PAGE_SIZE, \
+ .private = data}; \
+ *eof = 1; \
+ show_function(&seq_pos, data); \
+ return seq_pos.len; \
+} \
+const static can_proc_read_entry_ops_t ops_name = ops_name##_show_wrapper;
+
+static inline void *can_seq_data(can_proc_seq_file_t *sqf)
+{
+ return sqf->private;
+}
+
+static inline int can_seq_printf(can_proc_seq_file_t *sqf, const char *f, ...)
+{
+ int ret;
+ va_list args;
+ va_start(args, f);
+ ret = vsnprintf(sqf->buf + sqf->len, sqf->limit - sqf->len, f, args);
+ sqf->len += ret;
+ if (sqf->len > sqf->limit)
+ sqf->len = sqf->limit;
+ va_end(args);
+ return ret;
+}
+
+struct proc_dir_entry *can_create_proc_read_entry(const char *name,
+ mode_t mode, struct proc_dir_entry *parent,
+ const can_proc_read_entry_ops_t *proc_read_entry_ops, void * data)
+{
+ return create_proc_read_entry(name, mode, parent, *proc_read_entry_ops, data);
+}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,3,0))
+
+struct proc_dir_entry *can_proc_mkdir_mode(const char *name, umode_t mode,
+ struct proc_dir_entry *parent)
+{
+ return create_proc_entry(name, S_IFDIR | mode, parent);
+}
+
+/* This does not fully follow linux 2.4 and 2.6 prototype to simplify 2.2.x compatibility */
+/* The newer kernels use entry name instead of pointer to the entry */
+static int can_proc_remove(struct proc_dir_entry *del)
+{
+ if(!del) return -ENODEV;
+ remove_proc_entry(del->name, del->parent);
+ return 0;
+}
+
+static inline struct proc_dir_entry *can_proc_symlink(const char *name,
+ struct proc_dir_entry *parent, const char *dest)
+{
+ return proc_symlink(name, parent, dest);
+}
+
+#else /* ancient Linux kernel older than 2.3.0 */
static void can_fill_inode(struct inode *inode, int fill)
{
if (fill)
return new_entry;
}
-static int can_remove_proc_entry(struct proc_dir_entry *del, struct proc_dir_entry *parent)
+struct proc_dir_entry *can_create_proc_read_entry(const char *name,
+ mode_t mode, struct proc_dir_entry *parent,
+ read_proc_t *read_proc, void * data)
+{
+ return create_proc_read_entry(name, mode, parent, read_proc, data);
+}
+
+struct proc_dir_entry *can_proc_mkdir_mode(const char *name, umode_t mode,
+ struct proc_dir_entry *parent)
+{
+ return can_create_proc_entry(name, S_IFDIR | mode, parent);
+}
+
+static int can_proc_remove(struct proc_dir_entry *del)
{
if (del != NULL) {
- proc_unregister(parent, del->low_ino);
+ proc_unregister(del->parent, del->low_ino);
can_checked_free(del);
return 0;
}
return entry;
}
-#else /* Functions forwarded for kernel 2.4 and above */
-
-static inline struct proc_dir_entry * can_create_proc_entry(const char *name, mode_t mode,
- struct proc_dir_entry *parent)
-{
- return create_proc_entry(name, mode, parent);
-}
+#endif /* Linux 2.2 - 2.3 kernels */
-
-/* This does not fully follow linux 2.4 and 2.6 prototype to simplify 2.2.x compatibility */
-/* The newer kernels use entry name instead of pointer to the entry */
-static int can_remove_proc_entry(struct proc_dir_entry *del, struct proc_dir_entry *parent)
-{
- if(!del) return -ENODEV;
- remove_proc_entry(del->name,parent);
- return 0;
-}
-
-static inline struct proc_dir_entry *can_proc_symlink(const char *name,
- struct proc_dir_entry *parent, const char *dest)
-{
- return proc_symlink(name, parent, dest);
-}
-
-#endif /* Functions required for kernel 2.2 */
+#endif /* Linux kernel 3.6 and 3.10+ */
/* can_init_procdir registers the entire CAN directory tree recursively at
* the proc system.
{
int board;
struct candevice_t *candev;
- base->can_proc_entry = can_create_proc_entry("can", S_IFDIR | S_IRUGO |
+
+ mutex_init(&proc_mutex);
+
+ base->can_proc_entry = can_proc_mkdir_mode("can", S_IFDIR | S_IRUGO |
S_IXUGO, CAN_PROC_ROOT);
if (base->can_proc_entry == NULL)
return -ENODEV;
return 0;
}
+/* can_init_procentry registers entry of a new board in CAN directory tree at
+ * the proc system.
+ */
+int can_init_procentry(int board)
+{
+ struct candevice_t *candev;
+ candev=hardware_p->candevice[board];
+ if(candev)
+ return add_channel_to_procdir(candev);
+ return -ENODEV;
+}
+
/* can_delete_procdir removes the entire CAN tree from the proc system */
int can_delete_procdir(void)
{
- if (remove_channel_from_procdir())
+ if (remove_channels_from_procdir())
return -ENODEV;
/* name: "can" */
- if (can_remove_proc_entry(base->can_proc_entry, CAN_PROC_ROOT))
+ if (can_proc_remove(base->can_proc_entry))
return -ENODEV;
return 0;
}
-static int can_chip_procinfo(char *buf, char **start, off_t offset,
- int count, int *eof, void *data)
+/* can_delete_procentry removes device entries from CAN tree in the proc system */
+int can_delete_procentry(struct candevice_t *candev)
{
- struct canchip_t *chip=data;
- int len=0;
+ if (remove_channel_from_procdir(candev))
+ return -ENODEV;
+
+ return 0;
+}
+
+static int can_chip_procinfo_show(can_proc_seq_file_t *sqf, void *data)
+{
+ struct canchip_t *chip=can_seq_data(sqf);
/* Generic chip info */
- len += sprintf(buf+len,"type : %s\n",chip->chip_type);
- len += sprintf(buf+len,"index : %d\n",chip->chip_idx);
- len += sprintf(buf+len,"irq : %d\n",chip->chip_irq);
- len += sprintf(buf+len,"addr : %lu\n",
+ can_seq_printf(sqf, "type : %s\n",chip->chip_type);
+ can_seq_printf(sqf, "index : %d\n",chip->chip_idx);
+ can_seq_printf(sqf, "irq : %d\n",chip->chip_irq);
+ can_seq_printf(sqf, "addr : %lu\n",
can_ioptr2ulong(chip->chip_base_addr));
- len += sprintf(buf+len,"config : %s\n",
+ can_seq_printf(sqf, "config : %s\n",
(chip->flags & CHIP_CONFIGURED) ? "yes":"no");
- len += sprintf(buf+len,"clock : %ld Hz\n",chip->clock);
- len += sprintf(buf+len,"baud : %ld\n",chip->baudrate);
- len += sprintf(buf+len,"num obj : %d\n",chip->max_objects);
-
+ can_seq_printf(sqf, "clock : %ld Hz\n",chip->clock);
+ can_seq_printf(sqf, "baud : %ld\n",chip->baudrate);
+ can_seq_printf(sqf, "num obj : %d\n",chip->max_objects);
#if 0
/* Chip specific info if available */
len += (chip->chipspecops->get_info)(chip,buf+len);
#endif
- *eof = 1;
- return len;
+ return 0;
}
+CAN_PROC_SHOW_SINGLE_OPS_DECLARE(can_chip_procinfo_ops, can_chip_procinfo_show);
int add_channel_to_procdir(struct candevice_t *candev)
{
int i=0;
- for (i=0; i < candev->nr_all_chips; i++) {
+ mutex_lock(&proc_mutex);
+ for (i=0; i < MAX_TOT_CHIPS; i++){
+ if (!chips_p[i]) continue;
+ if (chips_p[i]->hostdevice != candev) continue;
- base->channel[cc] = (struct channelproc_t *)
+ base->channel[i] = (struct channelproc_t *)
can_checked_malloc(sizeof(struct channelproc_t));
- if (base->channel[cc] == NULL)
+ if (base->channel[i] == NULL){
+ mutex_unlock(&proc_mutex);
return -ENOMEM;
+ }
- sprintf(base->channel[cc]->ch_name, "channel%d",cc);
+ sprintf(base->channel[i]->ch_name, "channel%d",i);
- base->channel[cc]->ch_entry = can_create_proc_entry(
- base->channel[cc]->ch_name,
+ base->channel[i]->ch_entry = can_proc_mkdir_mode(
+ base->channel[i]->ch_name,
S_IFDIR | S_IRUGO |S_IXUGO,
base->can_proc_entry);
- if (base->channel[cc]->ch_entry == NULL)
+ if (base->channel[i]->ch_entry == NULL){
+ mutex_unlock(&proc_mutex);
return -ENODEV;
+ }
- add_object_to_procdir(cc);
+ add_object_to_procdir(i);
- create_proc_read_entry("chip_info", /* proc entry name */
+ can_create_proc_read_entry("chip_info", /* proc entry name */
0, /* protection mask, 0->default */
- base->channel[cc]->ch_entry, /* parent dir, NULL->/proc */
- can_chip_procinfo,
- candev->chip[i]);
-
+ base->channel[i]->ch_entry, /* parent dir, NULL->/proc */
+ &can_chip_procinfo_ops,
+ chips_p[i]);
cc++;
}
+ mutex_unlock(&proc_mutex);
return 0;
}
-int remove_channel_from_procdir(void)
+int remove_channels_from_procdir(void)
{
+ int i=0;
+
+ mutex_lock(&proc_mutex);
+ for (i=0; i < MAX_TOT_CHIPS; i++){
+ if (!chips_p[i]) continue;
- while (cc != 0) {
cc--;
- if(!base->channel[cc]) continue;
+ if(!base->channel[i]) continue;
+
+ remove_proc_entry("chip_info", base->channel[i]->ch_entry);
+
+ if (remove_object_from_procdir(i)){
+ mutex_unlock(&proc_mutex);
+ return -ENODEV;
+ }
+
+ /* name: base->channel[cc]->ch_name */
+ if (can_proc_remove(base->channel[i]->ch_entry)){
+ mutex_unlock(&proc_mutex);
+ return -ENODEV;
+ }
+
+ can_checked_free(base->channel[i]);
+ base->channel[i] = NULL;
+ }
+ mutex_unlock(&proc_mutex);
+
+ return 0;
+}
+
+int remove_channel_from_procdir(struct candevice_t *candev)
+{
+ int i=0,j=0;
+
+ mutex_lock(&proc_mutex);
+ for (i=0; i < MAX_TOT_CHIPS; i++){
+ if (!chips_p[i]) continue;
+ if (chips_p[i]->hostdevice != candev) continue;
+ if (!base->channel[i]) continue;
- remove_proc_entry("chip_info", base->channel[cc]->ch_entry);
+ remove_proc_entry("chip_info", base->channel[i]->ch_entry);
- if (remove_object_from_procdir(cc))
+ if (remove_object_from_procdir(i)){
+ mutex_unlock(&proc_mutex);
return -ENODEV;
+ }
/* name: base->channel[cc]->ch_name */
- if (can_remove_proc_entry(base->channel[cc]->ch_entry,
- base->can_proc_entry))
+ if (can_proc_remove(base->channel[i]->ch_entry)){
+ mutex_unlock(&proc_mutex);
return -ENODEV;
+ }
- can_checked_free(base->channel[cc]);
- base->channel[cc] = NULL;
+ can_checked_free(base->channel[i]);
+ base->channel[i] = NULL;
+
+ cc--;
}
+ mutex_unlock(&proc_mutex);
return 0;
}
sprintf(base->channel[chip_nr]->object[i]->obj_name,"object%d",i);
sprintf(base->channel[chip_nr]->object[i]->lnk_name,"dev");
- base->channel[chip_nr]->object[i]->obj_entry = can_create_proc_entry(
+ base->channel[chip_nr]->object[i]->obj_entry = can_proc_mkdir_mode(
base->channel[chip_nr]->object[i]->obj_name,
S_IFDIR | S_IRUGO | S_IXUGO,
base->channel[chip_nr]->ch_entry);
if(!base->channel[chip_nr]->object[i]) continue;
/* name: base->channel[chip_nr]->object[i]->lnk_name */
- if (can_remove_proc_entry( base->channel[chip_nr]->object[i]->lnk,
- base->channel[chip_nr]->object[i]->obj_entry))
+ if (can_proc_remove( base->channel[chip_nr]->object[i]->lnk))
return -ENODEV;
/* name: base->channel[chip_nr]->object[i]->obj_name */
- if (can_remove_proc_entry(
- base->channel[chip_nr]->object[i]->obj_entry,
- base->channel[chip_nr]->ch_entry))
+ if (can_proc_remove(base->channel[chip_nr]->object[i]->obj_entry))
return -ENODEV;
can_checked_free(base->channel[chip_nr]->object[i]);
projects / lincan.git / blobdiff