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ath9k: Add a debugfs interface to dump chip registers 

/<debugfs_root>/ieee80211/phyX/ath9k/regdump is the interface
to dump the registers.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: Vasanthakumar Thiagarajan <vasanth@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Vasanthakumar Thiagarajan 2011-03-01 05:30:55 -08:00 committed by John W. Linville
parent 6410db593e
commit 582d00641b
1 changed files with 54 additions and 0 deletions
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54
drivers/net/wireless/ath/ath9k/debug.c
View File

@ -15,6 +15,7 @@
*/
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <asm/unaligned.h>
#include "ath9k.h"
@ -30,6 +31,19 @@ static int ath9k_debugfs_open(struct inode *inode, struct file *file)
return 0;
}
static ssize_t ath9k_debugfs_read_buf(struct file *file, char __user *user_buf,
size_t count, loff_t *ppos)
{
u8 *buf = file->private_data;
return simple_read_from_buffer(user_buf, count, ppos, buf, strlen(buf));
}
static int ath9k_debugfs_release_buf(struct inode *inode, struct file *file)
{
vfree(file->private_data);
return 0;
}
#ifdef CONFIG_ATH_DEBUG
static ssize_t read_file_debug(struct file *file, char __user *user_buf,
@ -1027,6 +1041,42 @@ static const struct file_operations fops_regval = {
.llseek = default_llseek,
};
#define REGDUMP_LINE_SIZE 20
static int open_file_regdump(struct inode *inode, struct file *file)
{
struct ath_softc *sc = inode->i_private;
unsigned int len = 0;
u8 *buf;
int i;
unsigned long num_regs, regdump_len, max_reg_offset;
max_reg_offset = AR_SREV_9300_20_OR_LATER(sc->sc_ah) ? 0x16bd4 : 0xb500;
num_regs = max_reg_offset / 4 + 1;
regdump_len = num_regs * REGDUMP_LINE_SIZE + 1;
buf = vmalloc(regdump_len);
if (!buf)
return -ENOMEM;
ath9k_ps_wakeup(sc);
for (i = 0; i < num_regs; i++)
len += scnprintf(buf + len, regdump_len - len,
"0x%06x 0x%08x\n", i << 2, REG_READ(sc->sc_ah, i << 2));
ath9k_ps_restore(sc);
file->private_data = buf;
return 0;
}
static const struct file_operations fops_regdump = {
.open = open_file_regdump,
.read = ath9k_debugfs_read_buf,
.release = ath9k_debugfs_release_buf,
.owner = THIS_MODULE,
.llseek = default_llseek,/* read accesses f_pos */
};
int ath9k_init_debug(struct ath_hw *ah)
{
struct ath_common *common = ath9k_hw_common(ah);
@ -1091,6 +1141,10 @@ int ath9k_init_debug(struct ath_hw *ah)
sc->debug.debugfs_phy, &ah->config.cwm_ignore_extcca))
goto err;
if (!debugfs_create_file("regdump", S_IRUSR, sc->debug.debugfs_phy,
sc, &fops_regdump))
goto err;
sc->debug.regidx = 0;
return 0;
err: