android_kernel_xiaomi_sm8350/drivers/ide/ide-proc.c
Hannes Eder 71bfc7a7c7 ide: NULL noise: drivers/ide/ide-*.c
Fix this sparse warnings:
  drivers/ide/ide-disk_proc.c:130:11: warning: Using plain integer as NULL pointer
  drivers/ide/ide-floppy_proc.c:32:11: warning: Using plain integer as NULL pointer
  drivers/ide/ide-proc.c:234:11: warning: Using plain integer as NULL pointer
  drivers/ide/ide-tape.c:2141:11: warning: Using plain integer as NULL pointer

Signed-off-by: Hannes Eder <hannes@hanneseder.net>
Cc: trivial@kernel.org
Cc: kernel-janitors@vger.kernel.org
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2009-03-05 16:10:56 +01:00

702 lines
17 KiB
C

/*
* Copyright (C) 1997-1998 Mark Lord
* Copyright (C) 2003 Red Hat
*
* Some code was moved here from ide.c, see it for original copyrights.
*/
/*
* This is the /proc/ide/ filesystem implementation.
*
* Drive/Driver settings can be retrieved by reading the drive's
* "settings" files. e.g. "cat /proc/ide0/hda/settings"
* To write a new value "val" into a specific setting "name", use:
* echo "name:val" >/proc/ide/ide0/hda/settings
*/
#include <linux/module.h>
#include <asm/uaccess.h>
#include <linux/errno.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/mm.h>
#include <linux/pci.h>
#include <linux/ctype.h>
#include <linux/ide.h>
#include <linux/seq_file.h>
#include <asm/io.h>
static struct proc_dir_entry *proc_ide_root;
static int proc_ide_read_imodel
(char *page, char **start, off_t off, int count, int *eof, void *data)
{
ide_hwif_t *hwif = (ide_hwif_t *) data;
int len;
const char *name;
switch (hwif->chipset) {
case ide_generic: name = "generic"; break;
case ide_pci: name = "pci"; break;
case ide_cmd640: name = "cmd640"; break;
case ide_dtc2278: name = "dtc2278"; break;
case ide_ali14xx: name = "ali14xx"; break;
case ide_qd65xx: name = "qd65xx"; break;
case ide_umc8672: name = "umc8672"; break;
case ide_ht6560b: name = "ht6560b"; break;
case ide_4drives: name = "4drives"; break;
case ide_pmac: name = "mac-io"; break;
case ide_au1xxx: name = "au1xxx"; break;
case ide_palm3710: name = "palm3710"; break;
case ide_acorn: name = "acorn"; break;
default: name = "(unknown)"; break;
}
len = sprintf(page, "%s\n", name);
PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
}
static int proc_ide_read_mate
(char *page, char **start, off_t off, int count, int *eof, void *data)
{
ide_hwif_t *hwif = (ide_hwif_t *) data;
int len;
if (hwif && hwif->mate)
len = sprintf(page, "%s\n", hwif->mate->name);
else
len = sprintf(page, "(none)\n");
PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
}
static int proc_ide_read_channel
(char *page, char **start, off_t off, int count, int *eof, void *data)
{
ide_hwif_t *hwif = (ide_hwif_t *) data;
int len;
page[0] = hwif->channel ? '1' : '0';
page[1] = '\n';
len = 2;
PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
}
static int proc_ide_read_identify
(char *page, char **start, off_t off, int count, int *eof, void *data)
{
ide_drive_t *drive = (ide_drive_t *)data;
int len = 0, i = 0;
int err = 0;
len = sprintf(page, "\n");
if (drive) {
__le16 *val = (__le16 *)page;
err = taskfile_lib_get_identify(drive, page);
if (!err) {
char *out = (char *)page + SECTOR_SIZE;
page = out;
do {
out += sprintf(out, "%04x%c",
le16_to_cpup(val), (++i & 7) ? ' ' : '\n');
val += 1;
} while (i < SECTOR_SIZE / 2);
len = out - page;
}
}
PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
}
/**
* ide_find_setting - find a specific setting
* @st: setting table pointer
* @name: setting name
*
* Scan's the setting table for a matching entry and returns
* this or NULL if no entry is found. The caller must hold the
* setting semaphore
*/
static
const struct ide_proc_devset *ide_find_setting(const struct ide_proc_devset *st,
char *name)
{
while (st->name) {
if (strcmp(st->name, name) == 0)
break;
st++;
}
return st->name ? st : NULL;
}
/**
* ide_read_setting - read an IDE setting
* @drive: drive to read from
* @setting: drive setting
*
* Read a drive setting and return the value. The caller
* must hold the ide_setting_mtx when making this call.
*
* BUGS: the data return and error are the same return value
* so an error -EINVAL and true return of the same value cannot
* be told apart
*/
static int ide_read_setting(ide_drive_t *drive,
const struct ide_proc_devset *setting)
{
const struct ide_devset *ds = setting->setting;
int val = -EINVAL;
if (ds->get)
val = ds->get(drive);
return val;
}
/**
* ide_write_setting - read an IDE setting
* @drive: drive to read from
* @setting: drive setting
* @val: value
*
* Write a drive setting if it is possible. The caller
* must hold the ide_setting_mtx when making this call.
*
* BUGS: the data return and error are the same return value
* so an error -EINVAL and true return of the same value cannot
* be told apart
*
* FIXME: This should be changed to enqueue a special request
* to the driver to change settings, and then wait on a sema for completion.
* The current scheme of polling is kludgy, though safe enough.
*/
static int ide_write_setting(ide_drive_t *drive,
const struct ide_proc_devset *setting, int val)
{
const struct ide_devset *ds = setting->setting;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (!ds->set)
return -EPERM;
if ((ds->flags & DS_SYNC)
&& (val < setting->min || val > setting->max))
return -EINVAL;
return ide_devset_execute(drive, ds, val);
}
ide_devset_get(xfer_rate, current_speed);
static int set_xfer_rate (ide_drive_t *drive, int arg)
{
ide_task_t task;
int err;
if (arg < XFER_PIO_0 || arg > XFER_UDMA_6)
return -EINVAL;
memset(&task, 0, sizeof(task));
task.tf.command = ATA_CMD_SET_FEATURES;
task.tf.feature = SETFEATURES_XFER;
task.tf.nsect = (u8)arg;
task.tf_flags = IDE_TFLAG_OUT_FEATURE | IDE_TFLAG_OUT_NSECT |
IDE_TFLAG_IN_NSECT;
err = ide_no_data_taskfile(drive, &task);
if (!err) {
ide_set_xfer_rate(drive, (u8) arg);
ide_driveid_update(drive);
}
return err;
}
ide_devset_rw(current_speed, xfer_rate);
ide_devset_rw_field(init_speed, init_speed);
ide_devset_rw_flag(nice1, IDE_DFLAG_NICE1);
ide_devset_rw_field(number, dn);
static const struct ide_proc_devset ide_generic_settings[] = {
IDE_PROC_DEVSET(current_speed, 0, 70),
IDE_PROC_DEVSET(init_speed, 0, 70),
IDE_PROC_DEVSET(io_32bit, 0, 1 + (SUPPORT_VLB_SYNC << 1)),
IDE_PROC_DEVSET(keepsettings, 0, 1),
IDE_PROC_DEVSET(nice1, 0, 1),
IDE_PROC_DEVSET(number, 0, 3),
IDE_PROC_DEVSET(pio_mode, 0, 255),
IDE_PROC_DEVSET(unmaskirq, 0, 1),
IDE_PROC_DEVSET(using_dma, 0, 1),
{ NULL },
};
static void proc_ide_settings_warn(void)
{
static int warned;
if (warned)
return;
printk(KERN_WARNING "Warning: /proc/ide/hd?/settings interface is "
"obsolete, and will be removed soon!\n");
warned = 1;
}
static int proc_ide_read_settings
(char *page, char **start, off_t off, int count, int *eof, void *data)
{
const struct ide_proc_devset *setting, *g, *d;
const struct ide_devset *ds;
ide_drive_t *drive = (ide_drive_t *) data;
char *out = page;
int len, rc, mul_factor, div_factor;
proc_ide_settings_warn();
mutex_lock(&ide_setting_mtx);
g = ide_generic_settings;
d = drive->settings;
out += sprintf(out, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n");
out += sprintf(out, "----\t\t\t-----\t\t---\t\t---\t\t----\n");
while (g->name || (d && d->name)) {
/* read settings in the alphabetical order */
if (g->name && d && d->name) {
if (strcmp(d->name, g->name) < 0)
setting = d++;
else
setting = g++;
} else if (d && d->name) {
setting = d++;
} else
setting = g++;
mul_factor = setting->mulf ? setting->mulf(drive) : 1;
div_factor = setting->divf ? setting->divf(drive) : 1;
out += sprintf(out, "%-24s", setting->name);
rc = ide_read_setting(drive, setting);
if (rc >= 0)
out += sprintf(out, "%-16d", rc * mul_factor / div_factor);
else
out += sprintf(out, "%-16s", "write-only");
out += sprintf(out, "%-16d%-16d", (setting->min * mul_factor + div_factor - 1) / div_factor, setting->max * mul_factor / div_factor);
ds = setting->setting;
if (ds->get)
out += sprintf(out, "r");
if (ds->set)
out += sprintf(out, "w");
out += sprintf(out, "\n");
}
len = out - page;
mutex_unlock(&ide_setting_mtx);
PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
}
#define MAX_LEN 30
static int proc_ide_write_settings(struct file *file, const char __user *buffer,
unsigned long count, void *data)
{
ide_drive_t *drive = (ide_drive_t *) data;
char name[MAX_LEN + 1];
int for_real = 0, mul_factor, div_factor;
unsigned long n;
const struct ide_proc_devset *setting;
char *buf, *s;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
proc_ide_settings_warn();
if (count >= PAGE_SIZE)
return -EINVAL;
s = buf = (char *)__get_free_page(GFP_USER);
if (!buf)
return -ENOMEM;
if (copy_from_user(buf, buffer, count)) {
free_page((unsigned long)buf);
return -EFAULT;
}
buf[count] = '\0';
/*
* Skip over leading whitespace
*/
while (count && isspace(*s)) {
--count;
++s;
}
/*
* Do one full pass to verify all parameters,
* then do another to actually write the new settings.
*/
do {
char *p = s;
n = count;
while (n > 0) {
unsigned val;
char *q = p;
while (n > 0 && *p != ':') {
--n;
p++;
}
if (*p != ':')
goto parse_error;
if (p - q > MAX_LEN)
goto parse_error;
memcpy(name, q, p - q);
name[p - q] = 0;
if (n > 0) {
--n;
p++;
} else
goto parse_error;
val = simple_strtoul(p, &q, 10);
n -= q - p;
p = q;
if (n > 0 && !isspace(*p))
goto parse_error;
while (n > 0 && isspace(*p)) {
--n;
++p;
}
mutex_lock(&ide_setting_mtx);
/* generic settings first, then driver specific ones */
setting = ide_find_setting(ide_generic_settings, name);
if (!setting) {
if (drive->settings)
setting = ide_find_setting(drive->settings, name);
if (!setting) {
mutex_unlock(&ide_setting_mtx);
goto parse_error;
}
}
if (for_real) {
mul_factor = setting->mulf ? setting->mulf(drive) : 1;
div_factor = setting->divf ? setting->divf(drive) : 1;
ide_write_setting(drive, setting, val * div_factor / mul_factor);
}
mutex_unlock(&ide_setting_mtx);
}
} while (!for_real++);
free_page((unsigned long)buf);
return count;
parse_error:
free_page((unsigned long)buf);
printk("proc_ide_write_settings(): parse error\n");
return -EINVAL;
}
int proc_ide_read_capacity
(char *page, char **start, off_t off, int count, int *eof, void *data)
{
int len = sprintf(page, "%llu\n", (long long)0x7fffffff);
PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
}
EXPORT_SYMBOL_GPL(proc_ide_read_capacity);
int proc_ide_read_geometry
(char *page, char **start, off_t off, int count, int *eof, void *data)
{
ide_drive_t *drive = (ide_drive_t *) data;
char *out = page;
int len;
out += sprintf(out, "physical %d/%d/%d\n",
drive->cyl, drive->head, drive->sect);
out += sprintf(out, "logical %d/%d/%d\n",
drive->bios_cyl, drive->bios_head, drive->bios_sect);
len = out - page;
PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
}
EXPORT_SYMBOL(proc_ide_read_geometry);
static int proc_ide_read_dmodel
(char *page, char **start, off_t off, int count, int *eof, void *data)
{
ide_drive_t *drive = (ide_drive_t *) data;
char *m = (char *)&drive->id[ATA_ID_PROD];
int len;
len = sprintf(page, "%.40s\n", m[0] ? m : "(none)");
PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
}
static int proc_ide_read_driver
(char *page, char **start, off_t off, int count, int *eof, void *data)
{
ide_drive_t *drive = (ide_drive_t *)data;
struct device *dev = &drive->gendev;
struct ide_driver *ide_drv;
int len;
if (dev->driver) {
ide_drv = to_ide_driver(dev->driver);
len = sprintf(page, "%s version %s\n",
dev->driver->name, ide_drv->version);
} else
len = sprintf(page, "ide-default version 0.9.newide\n");
PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
}
static int ide_replace_subdriver(ide_drive_t *drive, const char *driver)
{
struct device *dev = &drive->gendev;
int ret = 1;
int err;
device_release_driver(dev);
/* FIXME: device can still be in use by previous driver */
strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
err = device_attach(dev);
if (err < 0)
printk(KERN_WARNING "IDE: %s: device_attach error: %d\n",
__func__, err);
drive->driver_req[0] = 0;
if (dev->driver == NULL) {
err = device_attach(dev);
if (err < 0)
printk(KERN_WARNING
"IDE: %s: device_attach(2) error: %d\n",
__func__, err);
}
if (dev->driver && !strcmp(dev->driver->name, driver))
ret = 0;
return ret;
}
static int proc_ide_write_driver
(struct file *file, const char __user *buffer, unsigned long count, void *data)
{
ide_drive_t *drive = (ide_drive_t *) data;
char name[32];
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
if (count > 31)
count = 31;
if (copy_from_user(name, buffer, count))
return -EFAULT;
name[count] = '\0';
if (ide_replace_subdriver(drive, name))
return -EINVAL;
return count;
}
static int proc_ide_read_media
(char *page, char **start, off_t off, int count, int *eof, void *data)
{
ide_drive_t *drive = (ide_drive_t *) data;
const char *media;
int len;
switch (drive->media) {
case ide_disk: media = "disk\n"; break;
case ide_cdrom: media = "cdrom\n"; break;
case ide_tape: media = "tape\n"; break;
case ide_floppy: media = "floppy\n"; break;
case ide_optical: media = "optical\n"; break;
default: media = "UNKNOWN\n"; break;
}
strcpy(page, media);
len = strlen(media);
PROC_IDE_READ_RETURN(page, start, off, count, eof, len);
}
static ide_proc_entry_t generic_drive_entries[] = {
{ "driver", S_IFREG|S_IRUGO, proc_ide_read_driver,
proc_ide_write_driver },
{ "identify", S_IFREG|S_IRUSR, proc_ide_read_identify, NULL },
{ "media", S_IFREG|S_IRUGO, proc_ide_read_media, NULL },
{ "model", S_IFREG|S_IRUGO, proc_ide_read_dmodel, NULL },
{ "settings", S_IFREG|S_IRUSR|S_IWUSR, proc_ide_read_settings,
proc_ide_write_settings },
{ NULL, 0, NULL, NULL }
};
static void ide_add_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p, void *data)
{
struct proc_dir_entry *ent;
if (!dir || !p)
return;
while (p->name != NULL) {
ent = create_proc_entry(p->name, p->mode, dir);
if (!ent) return;
ent->data = data;
ent->read_proc = p->read_proc;
ent->write_proc = p->write_proc;
p++;
}
}
static void ide_remove_proc_entries(struct proc_dir_entry *dir, ide_proc_entry_t *p)
{
if (!dir || !p)
return;
while (p->name != NULL) {
remove_proc_entry(p->name, dir);
p++;
}
}
void ide_proc_register_driver(ide_drive_t *drive, struct ide_driver *driver)
{
mutex_lock(&ide_setting_mtx);
drive->settings = driver->proc_devsets(drive);
mutex_unlock(&ide_setting_mtx);
ide_add_proc_entries(drive->proc, driver->proc_entries(drive), drive);
}
EXPORT_SYMBOL(ide_proc_register_driver);
/**
* ide_proc_unregister_driver - remove driver specific data
* @drive: drive
* @driver: driver
*
* Clean up the driver specific /proc files and IDE settings
* for a given drive.
*
* Takes ide_setting_mtx.
*/
void ide_proc_unregister_driver(ide_drive_t *drive, struct ide_driver *driver)
{
ide_remove_proc_entries(drive->proc, driver->proc_entries(drive));
mutex_lock(&ide_setting_mtx);
/*
* ide_setting_mtx protects both the settings list and the use
* of settings (we cannot take a setting out that is being used).
*/
drive->settings = NULL;
mutex_unlock(&ide_setting_mtx);
}
EXPORT_SYMBOL(ide_proc_unregister_driver);
void ide_proc_port_register_devices(ide_hwif_t *hwif)
{
struct proc_dir_entry *ent;
struct proc_dir_entry *parent = hwif->proc;
ide_drive_t *drive;
char name[64];
int i;
ide_port_for_each_dev(i, drive, hwif) {
if ((drive->dev_flags & IDE_DFLAG_PRESENT) == 0 || drive->proc)
continue;
drive->proc = proc_mkdir(drive->name, parent);
if (drive->proc)
ide_add_proc_entries(drive->proc, generic_drive_entries, drive);
sprintf(name, "ide%d/%s", (drive->name[2]-'a')/2, drive->name);
ent = proc_symlink(drive->name, proc_ide_root, name);
if (!ent) return;
}
}
void ide_proc_unregister_device(ide_drive_t *drive)
{
if (drive->proc) {
ide_remove_proc_entries(drive->proc, generic_drive_entries);
remove_proc_entry(drive->name, proc_ide_root);
remove_proc_entry(drive->name, drive->hwif->proc);
drive->proc = NULL;
}
}
static ide_proc_entry_t hwif_entries[] = {
{ "channel", S_IFREG|S_IRUGO, proc_ide_read_channel, NULL },
{ "mate", S_IFREG|S_IRUGO, proc_ide_read_mate, NULL },
{ "model", S_IFREG|S_IRUGO, proc_ide_read_imodel, NULL },
{ NULL, 0, NULL, NULL }
};
void ide_proc_register_port(ide_hwif_t *hwif)
{
if (!hwif->proc) {
hwif->proc = proc_mkdir(hwif->name, proc_ide_root);
if (!hwif->proc)
return;
ide_add_proc_entries(hwif->proc, hwif_entries, hwif);
}
}
void ide_proc_unregister_port(ide_hwif_t *hwif)
{
if (hwif->proc) {
ide_remove_proc_entries(hwif->proc, hwif_entries);
remove_proc_entry(hwif->name, proc_ide_root);
hwif->proc = NULL;
}
}
static int proc_print_driver(struct device_driver *drv, void *data)
{
struct ide_driver *ide_drv = to_ide_driver(drv);
struct seq_file *s = data;
seq_printf(s, "%s version %s\n", drv->name, ide_drv->version);
return 0;
}
static int ide_drivers_show(struct seq_file *s, void *p)
{
int err;
err = bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
if (err < 0)
printk(KERN_WARNING "IDE: %s: bus_for_each_drv error: %d\n",
__func__, err);
return 0;
}
static int ide_drivers_open(struct inode *inode, struct file *file)
{
return single_open(file, &ide_drivers_show, NULL);
}
static const struct file_operations ide_drivers_operations = {
.owner = THIS_MODULE,
.open = ide_drivers_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
void proc_ide_create(void)
{
proc_ide_root = proc_mkdir("ide", NULL);
if (!proc_ide_root)
return;
proc_create("drivers", 0, proc_ide_root, &ide_drivers_operations);
}
void proc_ide_destroy(void)
{
remove_proc_entry("drivers", proc_ide_root);
remove_proc_entry("ide", NULL);
}