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linuxdebug/drivers/net/wireless/marvell/libertas/debugfs.c

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// SPDX-License-Identifier: GPL-2.0
#include <linux/dcache.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/hardirq.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/export.h>
#include "decl.h"
#include "cmd.h"
#include "debugfs.h"
static struct dentry *lbs_dir;
static char *szStates[] = {
"Connected",
"Disconnected"
};
#ifdef PROC_DEBUG
static void lbs_debug_init(struct lbs_private *priv);
#endif
static ssize_t write_file_dummy(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
return -EINVAL;
}
static const size_t len = PAGE_SIZE;
static ssize_t lbs_dev_info(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct lbs_private *priv = file->private_data;
size_t pos = 0;
unsigned long addr = get_zeroed_page(GFP_KERNEL);
char *buf = (char *)addr;
ssize_t res;
if (!buf)
return -ENOMEM;
pos += snprintf(buf+pos, len-pos, "state = %s\n",
szStates[priv->connect_status]);
pos += snprintf(buf+pos, len-pos, "region_code = %02x\n",
(u32) priv->regioncode);
res = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
free_page(addr);
return res;
}
static ssize_t lbs_sleepparams_write(struct file *file,
const char __user *user_buf, size_t count,
loff_t *ppos)
{
struct lbs_private *priv = file->private_data;
ssize_t ret;
struct sleep_params sp;
int p1, p2, p3, p4, p5, p6;
char *buf;
buf = memdup_user_nul(user_buf, min(count, len - 1));
if (IS_ERR(buf))
return PTR_ERR(buf);
ret = sscanf(buf, "%d %d %d %d %d %d", &p1, &p2, &p3, &p4, &p5, &p6);
if (ret != 6) {
ret = -EINVAL;
goto out_unlock;
}
sp.sp_error = p1;
sp.sp_offset = p2;
sp.sp_stabletime = p3;
sp.sp_calcontrol = p4;
sp.sp_extsleepclk = p5;
sp.sp_reserved = p6;
ret = lbs_cmd_802_11_sleep_params(priv, CMD_ACT_SET, &sp);
if (!ret)
ret = count;
else if (ret > 0)
ret = -EINVAL;
out_unlock:
kfree(buf);
return ret;
}
static ssize_t lbs_sleepparams_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct lbs_private *priv = file->private_data;
ssize_t ret;
size_t pos = 0;
struct sleep_params sp;
unsigned long addr = get_zeroed_page(GFP_KERNEL);
char *buf = (char *)addr;
if (!buf)
return -ENOMEM;
ret = lbs_cmd_802_11_sleep_params(priv, CMD_ACT_GET, &sp);
if (ret)
goto out_unlock;
pos += snprintf(buf, len, "%d %d %d %d %d %d\n", sp.sp_error,
sp.sp_offset, sp.sp_stabletime,
sp.sp_calcontrol, sp.sp_extsleepclk,
sp.sp_reserved);
ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
out_unlock:
free_page(addr);
return ret;
}
static ssize_t lbs_host_sleep_write(struct file *file,
const char __user *user_buf, size_t count,
loff_t *ppos)
{
struct lbs_private *priv = file->private_data;
ssize_t ret;
int host_sleep;
char *buf;
buf = memdup_user_nul(user_buf, min(count, len - 1));
if (IS_ERR(buf))
return PTR_ERR(buf);
ret = sscanf(buf, "%d", &host_sleep);
if (ret != 1) {
ret = -EINVAL;
goto out_unlock;
}
if (host_sleep == 0)
ret = lbs_set_host_sleep(priv, 0);
else if (host_sleep == 1) {
if (priv->wol_criteria == EHS_REMOVE_WAKEUP) {
netdev_info(priv->dev,
"wake parameters not configured\n");
ret = -EINVAL;
goto out_unlock;
}
ret = lbs_set_host_sleep(priv, 1);
} else {
netdev_err(priv->dev, "invalid option\n");
ret = -EINVAL;
}
if (!ret)
ret = count;
out_unlock:
kfree(buf);
return ret;
}
static ssize_t lbs_host_sleep_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct lbs_private *priv = file->private_data;
ssize_t ret;
size_t pos = 0;
unsigned long addr = get_zeroed_page(GFP_KERNEL);
char *buf = (char *)addr;
if (!buf)
return -ENOMEM;
pos += snprintf(buf, len, "%d\n", priv->is_host_sleep_activated);
ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
free_page(addr);
return ret;
}
/*
* When calling CMD_802_11_SUBSCRIBE_EVENT with CMD_ACT_GET, me might
* get a bunch of vendor-specific TLVs (a.k.a. IEs) back from the
* firmware. Here's an example:
* 04 01 02 00 00 00 05 01 02 00 00 00 06 01 02 00
* 00 00 07 01 02 00 3c 00 00 00 00 00 00 00 03 03
* 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
*
* The 04 01 is the TLV type (here TLV_TYPE_RSSI_LOW), 02 00 is the length,
* 00 00 are the data bytes of this TLV. For this TLV, their meaning is
* defined in mrvlietypes_thresholds
*
* This function searches in this TLV data chunk for a given TLV type
* and returns a pointer to the first data byte of the TLV, or to NULL
* if the TLV hasn't been found.
*/
static void *lbs_tlv_find(uint16_t tlv_type, const uint8_t *tlv, uint16_t size)
{
struct mrvl_ie_header *tlv_h;
uint16_t length;
ssize_t pos = 0;
while (pos < size) {
tlv_h = (struct mrvl_ie_header *) tlv;
if (!tlv_h->len)
return NULL;
if (tlv_h->type == cpu_to_le16(tlv_type))
return tlv_h;
length = le16_to_cpu(tlv_h->len) + sizeof(*tlv_h);
pos += length;
tlv += length;
}
return NULL;
}
static ssize_t lbs_threshold_read(uint16_t tlv_type, uint16_t event_mask,
struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct cmd_ds_802_11_subscribe_event *subscribed;
struct mrvl_ie_thresholds *got;
struct lbs_private *priv = file->private_data;
ssize_t ret = 0;
size_t pos = 0;
char *buf;
u8 value;
u8 freq;
int events = 0;
buf = (char *)get_zeroed_page(GFP_KERNEL);
if (!buf)
return -ENOMEM;
subscribed = kzalloc(sizeof(*subscribed), GFP_KERNEL);
if (!subscribed) {
ret = -ENOMEM;
goto out_page;
}
subscribed->hdr.size = cpu_to_le16(sizeof(*subscribed));
subscribed->action = cpu_to_le16(CMD_ACT_GET);
ret = lbs_cmd_with_response(priv, CMD_802_11_SUBSCRIBE_EVENT, subscribed);
if (ret)
goto out_cmd;
got = lbs_tlv_find(tlv_type, subscribed->tlv, sizeof(subscribed->tlv));
if (got) {
value = got->value;
freq = got->freq;
events = le16_to_cpu(subscribed->events);
pos += snprintf(buf, len, "%d %d %d\n", value, freq,
!!(events & event_mask));
}
ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
out_cmd:
kfree(subscribed);
out_page:
free_page((unsigned long)buf);
return ret;
}
static ssize_t lbs_threshold_write(uint16_t tlv_type, uint16_t event_mask,
struct file *file,
const char __user *userbuf, size_t count,
loff_t *ppos)
{
struct cmd_ds_802_11_subscribe_event *events;
struct mrvl_ie_thresholds *tlv;
struct lbs_private *priv = file->private_data;
int value, freq, new_mask;
uint16_t curr_mask;
char *buf;
int ret;
buf = memdup_user_nul(userbuf, min(count, len - 1));
if (IS_ERR(buf))
return PTR_ERR(buf);
ret = sscanf(buf, "%d %d %d", &value, &freq, &new_mask);
if (ret != 3) {
ret = -EINVAL;
goto out_page;
}
events = kzalloc(sizeof(*events), GFP_KERNEL);
if (!events) {
ret = -ENOMEM;
goto out_page;
}
events->hdr.size = cpu_to_le16(sizeof(*events));
events->action = cpu_to_le16(CMD_ACT_GET);
ret = lbs_cmd_with_response(priv, CMD_802_11_SUBSCRIBE_EVENT, events);
if (ret)
goto out_events;
curr_mask = le16_to_cpu(events->events);
if (new_mask)
new_mask = curr_mask | event_mask;
else
new_mask = curr_mask & ~event_mask;
/* Now everything is set and we can send stuff down to the firmware */
tlv = (void *)events->tlv;
events->action = cpu_to_le16(CMD_ACT_SET);
events->events = cpu_to_le16(new_mask);
tlv->header.type = cpu_to_le16(tlv_type);
tlv->header.len = cpu_to_le16(sizeof(*tlv) - sizeof(tlv->header));
tlv->value = value;
if (tlv_type != TLV_TYPE_BCNMISS)
tlv->freq = freq;
/* The command header, the action, the event mask, and one TLV */
events->hdr.size = cpu_to_le16(sizeof(events->hdr) + 4 + sizeof(*tlv));
ret = lbs_cmd_with_response(priv, CMD_802_11_SUBSCRIBE_EVENT, events);
if (!ret)
ret = count;
out_events:
kfree(events);
out_page:
kfree(buf);
return ret;
}
static ssize_t lbs_lowrssi_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
return lbs_threshold_read(TLV_TYPE_RSSI_LOW, CMD_SUBSCRIBE_RSSI_LOW,
file, userbuf, count, ppos);
}
static ssize_t lbs_lowrssi_write(struct file *file, const char __user *userbuf,
size_t count, loff_t *ppos)
{
return lbs_threshold_write(TLV_TYPE_RSSI_LOW, CMD_SUBSCRIBE_RSSI_LOW,
file, userbuf, count, ppos);
}
static ssize_t lbs_lowsnr_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
return lbs_threshold_read(TLV_TYPE_SNR_LOW, CMD_SUBSCRIBE_SNR_LOW,
file, userbuf, count, ppos);
}
static ssize_t lbs_lowsnr_write(struct file *file, const char __user *userbuf,
size_t count, loff_t *ppos)
{
return lbs_threshold_write(TLV_TYPE_SNR_LOW, CMD_SUBSCRIBE_SNR_LOW,
file, userbuf, count, ppos);
}
static ssize_t lbs_failcount_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
return lbs_threshold_read(TLV_TYPE_FAILCOUNT, CMD_SUBSCRIBE_FAILCOUNT,
file, userbuf, count, ppos);
}
static ssize_t lbs_failcount_write(struct file *file, const char __user *userbuf,
size_t count, loff_t *ppos)
{
return lbs_threshold_write(TLV_TYPE_FAILCOUNT, CMD_SUBSCRIBE_FAILCOUNT,
file, userbuf, count, ppos);
}
static ssize_t lbs_highrssi_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
return lbs_threshold_read(TLV_TYPE_RSSI_HIGH, CMD_SUBSCRIBE_RSSI_HIGH,
file, userbuf, count, ppos);
}
static ssize_t lbs_highrssi_write(struct file *file, const char __user *userbuf,
size_t count, loff_t *ppos)
{
return lbs_threshold_write(TLV_TYPE_RSSI_HIGH, CMD_SUBSCRIBE_RSSI_HIGH,
file, userbuf, count, ppos);
}
static ssize_t lbs_highsnr_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
return lbs_threshold_read(TLV_TYPE_SNR_HIGH, CMD_SUBSCRIBE_SNR_HIGH,
file, userbuf, count, ppos);
}
static ssize_t lbs_highsnr_write(struct file *file, const char __user *userbuf,
size_t count, loff_t *ppos)
{
return lbs_threshold_write(TLV_TYPE_SNR_HIGH, CMD_SUBSCRIBE_SNR_HIGH,
file, userbuf, count, ppos);
}
static ssize_t lbs_bcnmiss_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
return lbs_threshold_read(TLV_TYPE_BCNMISS, CMD_SUBSCRIBE_BCNMISS,
file, userbuf, count, ppos);
}
static ssize_t lbs_bcnmiss_write(struct file *file, const char __user *userbuf,
size_t count, loff_t *ppos)
{
return lbs_threshold_write(TLV_TYPE_BCNMISS, CMD_SUBSCRIBE_BCNMISS,
file, userbuf, count, ppos);
}
static ssize_t lbs_rdmac_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct lbs_private *priv = file->private_data;
ssize_t pos = 0;
int ret;
unsigned long addr = get_zeroed_page(GFP_KERNEL);
char *buf = (char *)addr;
u32 val = 0;
if (!buf)
return -ENOMEM;
ret = lbs_get_reg(priv, CMD_MAC_REG_ACCESS, priv->mac_offset, &val);
mdelay(10);
if (!ret) {
pos = snprintf(buf, len, "MAC[0x%x] = 0x%08x\n",
priv->mac_offset, val);
ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
}
free_page(addr);
return ret;
}
static ssize_t lbs_rdmac_write(struct file *file,
const char __user *userbuf,
size_t count, loff_t *ppos)
{
struct lbs_private *priv = file->private_data;
char *buf;
buf = memdup_user_nul(userbuf, min(count, len - 1));
if (IS_ERR(buf))
return PTR_ERR(buf);
priv->mac_offset = simple_strtoul(buf, NULL, 16);
kfree(buf);
return count;
}
static ssize_t lbs_wrmac_write(struct file *file,
const char __user *userbuf,
size_t count, loff_t *ppos)
{
struct lbs_private *priv = file->private_data;
ssize_t res;
u32 offset, value;
char *buf;
buf = memdup_user_nul(userbuf, min(count, len - 1));
if (IS_ERR(buf))
return PTR_ERR(buf);
res = sscanf(buf, "%x %x", &offset, &value);
if (res != 2) {
res = -EFAULT;
goto out_unlock;
}
res = lbs_set_reg(priv, CMD_MAC_REG_ACCESS, offset, value);
mdelay(10);
if (!res)
res = count;
out_unlock:
kfree(buf);
return res;
}
static ssize_t lbs_rdbbp_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct lbs_private *priv = file->private_data;
ssize_t pos = 0;
int ret;
unsigned long addr = get_zeroed_page(GFP_KERNEL);
char *buf = (char *)addr;
u32 val;
if (!buf)
return -ENOMEM;
ret = lbs_get_reg(priv, CMD_BBP_REG_ACCESS, priv->bbp_offset, &val);
mdelay(10);
if (!ret) {
pos = snprintf(buf, len, "BBP[0x%x] = 0x%08x\n",
priv->bbp_offset, val);
ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
}
free_page(addr);
return ret;
}
static ssize_t lbs_rdbbp_write(struct file *file,
const char __user *userbuf,
size_t count, loff_t *ppos)
{
struct lbs_private *priv = file->private_data;
char *buf;
buf = memdup_user_nul(userbuf, min(count, len - 1));
if (IS_ERR(buf))
return PTR_ERR(buf);
priv->bbp_offset = simple_strtoul(buf, NULL, 16);
kfree(buf);
return count;
}
static ssize_t lbs_wrbbp_write(struct file *file,
const char __user *userbuf,
size_t count, loff_t *ppos)
{
struct lbs_private *priv = file->private_data;
ssize_t res;
u32 offset, value;
char *buf;
buf = memdup_user_nul(userbuf, min(count, len - 1));
if (IS_ERR(buf))
return PTR_ERR(buf);
res = sscanf(buf, "%x %x", &offset, &value);
if (res != 2) {
res = -EFAULT;
goto out_unlock;
}
res = lbs_set_reg(priv, CMD_BBP_REG_ACCESS, offset, value);
mdelay(10);
if (!res)
res = count;
out_unlock:
kfree(buf);
return res;
}
static ssize_t lbs_rdrf_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
struct lbs_private *priv = file->private_data;
ssize_t pos = 0;
int ret;
unsigned long addr = get_zeroed_page(GFP_KERNEL);
char *buf = (char *)addr;
u32 val;
if (!buf)
return -ENOMEM;
ret = lbs_get_reg(priv, CMD_RF_REG_ACCESS, priv->rf_offset, &val);
mdelay(10);
if (!ret) {
pos = snprintf(buf, len, "RF[0x%x] = 0x%08x\n",
priv->rf_offset, val);
ret = simple_read_from_buffer(userbuf, count, ppos, buf, pos);
}
free_page(addr);
return ret;
}
static ssize_t lbs_rdrf_write(struct file *file,
const char __user *userbuf,
size_t count, loff_t *ppos)
{
struct lbs_private *priv = file->private_data;
char *buf;
buf = memdup_user_nul(userbuf, min(count, len - 1));
if (IS_ERR(buf))
return PTR_ERR(buf);
priv->rf_offset = simple_strtoul(buf, NULL, 16);
kfree(buf);
return count;
}
static ssize_t lbs_wrrf_write(struct file *file,
const char __user *userbuf,
size_t count, loff_t *ppos)
{
struct lbs_private *priv = file->private_data;
ssize_t res;
u32 offset, value;
char *buf;
buf = memdup_user_nul(userbuf, min(count, len - 1));
if (IS_ERR(buf))
return PTR_ERR(buf);
res = sscanf(buf, "%x %x", &offset, &value);
if (res != 2) {
res = -EFAULT;
goto out_unlock;
}
res = lbs_set_reg(priv, CMD_RF_REG_ACCESS, offset, value);
mdelay(10);
if (!res)
res = count;
out_unlock:
kfree(buf);
return res;
}
#define FOPS(fread, fwrite) { \
.owner = THIS_MODULE, \
.open = simple_open, \
.read = (fread), \
.write = (fwrite), \
.llseek = generic_file_llseek, \
}
struct lbs_debugfs_files {
const char *name;
umode_t perm;
struct file_operations fops;
};
static const struct lbs_debugfs_files debugfs_files[] = {
{ "info", 0444, FOPS(lbs_dev_info, write_file_dummy), },
{ "sleepparams", 0644, FOPS(lbs_sleepparams_read,
lbs_sleepparams_write), },
{ "hostsleep", 0644, FOPS(lbs_host_sleep_read,
lbs_host_sleep_write), },
};
static const struct lbs_debugfs_files debugfs_events_files[] = {
{"low_rssi", 0644, FOPS(lbs_lowrssi_read,
lbs_lowrssi_write), },
{"low_snr", 0644, FOPS(lbs_lowsnr_read,
lbs_lowsnr_write), },
{"failure_count", 0644, FOPS(lbs_failcount_read,
lbs_failcount_write), },
{"beacon_missed", 0644, FOPS(lbs_bcnmiss_read,
lbs_bcnmiss_write), },
{"high_rssi", 0644, FOPS(lbs_highrssi_read,
lbs_highrssi_write), },
{"high_snr", 0644, FOPS(lbs_highsnr_read,
lbs_highsnr_write), },
};
static const struct lbs_debugfs_files debugfs_regs_files[] = {
{"rdmac", 0644, FOPS(lbs_rdmac_read, lbs_rdmac_write), },
{"wrmac", 0600, FOPS(NULL, lbs_wrmac_write), },
{"rdbbp", 0644, FOPS(lbs_rdbbp_read, lbs_rdbbp_write), },
{"wrbbp", 0600, FOPS(NULL, lbs_wrbbp_write), },
{"rdrf", 0644, FOPS(lbs_rdrf_read, lbs_rdrf_write), },
{"wrrf", 0600, FOPS(NULL, lbs_wrrf_write), },
};
void lbs_debugfs_init(void)
{
if (!lbs_dir)
lbs_dir = debugfs_create_dir("lbs_wireless", NULL);
}
void lbs_debugfs_remove(void)
{
debugfs_remove(lbs_dir);
}
void lbs_debugfs_init_one(struct lbs_private *priv, struct net_device *dev)
{
int i;
const struct lbs_debugfs_files *files;
if (!lbs_dir)
goto exit;
priv->debugfs_dir = debugfs_create_dir(dev->name, lbs_dir);
for (i=0; i<ARRAY_SIZE(debugfs_files); i++) {
files = &debugfs_files[i];
priv->debugfs_files[i] = debugfs_create_file(files->name,
files->perm,
priv->debugfs_dir,
priv,
&files->fops);
}
priv->events_dir = debugfs_create_dir("subscribed_events", priv->debugfs_dir);
for (i=0; i<ARRAY_SIZE(debugfs_events_files); i++) {
files = &debugfs_events_files[i];
priv->debugfs_events_files[i] = debugfs_create_file(files->name,
files->perm,
priv->events_dir,
priv,
&files->fops);
}
priv->regs_dir = debugfs_create_dir("registers", priv->debugfs_dir);
for (i=0; i<ARRAY_SIZE(debugfs_regs_files); i++) {
files = &debugfs_regs_files[i];
priv->debugfs_regs_files[i] = debugfs_create_file(files->name,
files->perm,
priv->regs_dir,
priv,
&files->fops);
}
#ifdef PROC_DEBUG
lbs_debug_init(priv);
#endif
exit:
return;
}
void lbs_debugfs_remove_one(struct lbs_private *priv)
{
int i;
for(i=0; i<ARRAY_SIZE(debugfs_regs_files); i++)
debugfs_remove(priv->debugfs_regs_files[i]);
debugfs_remove(priv->regs_dir);
for(i=0; i<ARRAY_SIZE(debugfs_events_files); i++)
debugfs_remove(priv->debugfs_events_files[i]);
debugfs_remove(priv->events_dir);
#ifdef PROC_DEBUG
debugfs_remove(priv->debugfs_debug);
#endif
for(i=0; i<ARRAY_SIZE(debugfs_files); i++)
debugfs_remove(priv->debugfs_files[i]);
debugfs_remove(priv->debugfs_dir);
}
/* debug entry */
#ifdef PROC_DEBUG
#define item_size(n) (sizeof_field(struct lbs_private, n))
#define item_addr(n) (offsetof(struct lbs_private, n))
struct debug_data {
char name[32];
u32 size;
size_t addr;
};
/* To debug any member of struct lbs_private, simply add one line here.
*/
static struct debug_data items[] = {
{"psmode", item_size(psmode), item_addr(psmode)},
{"psstate", item_size(psstate), item_addr(psstate)},
};
static int num_of_items = ARRAY_SIZE(items);
/**
* lbs_debugfs_read - proc read function
*
* @file: file to read
* @userbuf: pointer to buffer
* @count: number of bytes to read
* @ppos: read data starting position
*
* returns: amount of data read or negative error code
*/
static ssize_t lbs_debugfs_read(struct file *file, char __user *userbuf,
size_t count, loff_t *ppos)
{
int val = 0;
size_t pos = 0;
ssize_t res;
char *p;
int i;
struct debug_data *d;
unsigned long addr = get_zeroed_page(GFP_KERNEL);
char *buf = (char *)addr;
if (!buf)
return -ENOMEM;
p = buf;
d = file->private_data;
for (i = 0; i < num_of_items; i++) {
if (d[i].size == 1)
val = *((u8 *) d[i].addr);
else if (d[i].size == 2)
val = *((u16 *) d[i].addr);
else if (d[i].size == 4)
val = *((u32 *) d[i].addr);
else if (d[i].size == 8)
val = *((u64 *) d[i].addr);
pos += sprintf(p + pos, "%s=%d\n", d[i].name, val);
}
res = simple_read_from_buffer(userbuf, count, ppos, p, pos);
free_page(addr);
return res;
}
/**
* lbs_debugfs_write - proc write function
*
* @f: file pointer
* @buf: pointer to data buffer
* @cnt: data number to write
* @ppos: file position
*
* returns: amount of data written
*/
static ssize_t lbs_debugfs_write(struct file *f, const char __user *buf,
size_t cnt, loff_t *ppos)
{
int r, i;
char *pdata;
char *p;
char *p0;
char *p1;
char *p2;
struct debug_data *d = f->private_data;
if (cnt == 0)
return 0;
pdata = memdup_user_nul(buf, cnt);
if (IS_ERR(pdata))
return PTR_ERR(pdata);
p0 = pdata;
for (i = 0; i < num_of_items; i++) {
do {
p = strstr(p0, d[i].name);
if (p == NULL)
break;
p1 = strchr(p, '\n');
if (p1 == NULL)
break;
p0 = p1++;
p2 = strchr(p, '=');
if (!p2)
break;
p2++;
r = simple_strtoul(p2, NULL, 0);
if (d[i].size == 1)
*((u8 *) d[i].addr) = (u8) r;
else if (d[i].size == 2)
*((u16 *) d[i].addr) = (u16) r;
else if (d[i].size == 4)
*((u32 *) d[i].addr) = (u32) r;
else if (d[i].size == 8)
*((u64 *) d[i].addr) = (u64) r;
break;
} while (1);
}
kfree(pdata);
return (ssize_t)cnt;
}
static const struct file_operations lbs_debug_fops = {
.owner = THIS_MODULE,
.open = simple_open,
.write = lbs_debugfs_write,
.read = lbs_debugfs_read,
.llseek = default_llseek,
};
/**
* lbs_debug_init - create debug proc file
*
* @priv: pointer to &struct lbs_private
*
* returns: N/A
*/
static void lbs_debug_init(struct lbs_private *priv)
{
int i;
if (!priv->debugfs_dir)
return;
for (i = 0; i < num_of_items; i++)
items[i].addr += (size_t) priv;
priv->debugfs_debug = debugfs_create_file("debug", 0644,
priv->debugfs_dir, &items[0],
&lbs_debug_fops);
}
#endif
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