diff options
| author | Vasanthakumar Thiagarajan <vasanth@atheros.com> | 2011-03-01 05:30:55 -0800 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2011-03-04 14:05:17 -0500 |
| commit | 582d00641b03efa892b3d2cfe6b45c1fe6d422a1 (patch) | |
| tree | 9a9d96cbe404dc0e40d3ceb6a9aef2ad26ca23e3 /drivers/net/wireless | |
| parent | 6410db593e8c1b2b79a2f18554310d6da9415584 (diff) | |
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>
Diffstat (limited to 'drivers/net/wireless')
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/debug.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c index 5cfcf8c235a..d404aa0ac76 100644 --- a/drivers/net/wireless/ath/ath9k/debug.c +++ b/drivers/net/wireless/ath/ath9k/debug.c @@ -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: |