ath9k: add a patch for dumping the eeprom contents via debugfs

SVN-Revision: 22870

package/mac80211/patches/540-ath9k_eeprom_debugfs.patch

+--- a/drivers/net/wireless/ath/ath9k/debug.c
++++ b/drivers/net/wireless/ath/ath9k/debug.c
+@@ -897,6 +897,53 @@ static const struct file_operations fops
+ 	.owner = THIS_MODULE
+ };
+ 
++static ssize_t read_file_eeprom(struct file *file, char __user *user_buf,
++			     size_t count, loff_t *ppos)
++{
++	struct ath_softc *sc = file->private_data;
++	struct ath_hw *ah = sc->sc_ah;
++	struct ath_common *common = ath9k_hw_common(ah);
++	int bytes = 0;
++	int pos = *ppos;
++	int size = 4096;
++	u16 val;
++	int i;
++
++	if (AR_SREV_9300_20_OR_LATER(ah))
++		size = 16384;
++
++	if (*ppos < 0)
++		return -EINVAL;
++
++	if (count > size - *ppos)
++		count = size - *ppos;
++
++	for (i = *ppos / 2; count > 0; count -= bytes, *ppos += bytes, i++) {
++		void *from = &val;
++
++		if (!common->bus_ops->eeprom_read(common, i, &val))
++			val = 0xffff;
++
++		if (*ppos % 2) {
++			from++;
++			bytes = 1;
++		} else if (count == 1) {
++			bytes = 1;
++		} else {
++			bytes = 2;
++		}
++		copy_to_user(user_buf, from, bytes);
++		user_buf += bytes;
++	}
++	return *ppos - pos;
++}
++
++static const struct file_operations fops_eeprom = {
++	.read = read_file_eeprom,
++	.open = ath9k_debugfs_open,
++	.owner = THIS_MODULE
++};
++
+ int ath9k_init_debug(struct ath_hw *ah)
+ {
+ 	struct ath_common *common = ath9k_hw_common(ah);
+@@ -960,6 +1007,10 @@ int ath9k_init_debug(struct ath_hw *ah)
+ 			sc->debug.debugfs_phy, &ah->config.cwm_ignore_extcca))
+ 		goto err;
+ 
++	if (!debugfs_create_file("eeprom", S_IRUSR,
++			sc->debug.debugfs_phy, sc, &fops_eeprom))
++		goto err;
++
+ 	sc->debug.regidx = 0;
+ 	return 0;
+ err: