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Commit 8718389b authored by Lorenzo Bianconi's avatar Lorenzo Bianconi Committed by Kalle Valo
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ath9k: add debugfs support for hw TPC 



Add tpc entry to ath9k debugfs in order to enable/disable hw TPC

Signed-off-by: default avatarLorenzo Bianconi <lorenzo.bianconi83@gmail.com>
Signed-off-by: default avatarKalle Valo <kvalo@codeaurora.org>
parent a9abe302

drivers/net/wireless/ath/ath9k/debug.c

+71 −0
Original line number Diff line number Diff line
@@ -1115,6 +1115,75 @@ static const struct file_operations fops_ackto = { 
};

#endif



static ssize_t read_file_tpc(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;

	unsigned int len = 0, size = 32;

	ssize_t retval;

	char *buf;



	buf = kzalloc(size, GFP_KERNEL);

	if (!buf)

		return -ENOMEM;



	len += scnprintf(buf + len, size - len, "%s\n",

			 ah->tpc_enabled ? "ENABLED" : "DISABLED");



	if (len > size)

		len = size;



	retval = simple_read_from_buffer(user_buf, count, ppos, buf, len);

	kfree(buf);



	return retval;

}



static ssize_t write_file_tpc(struct file *file, const char __user *user_buf,

			      size_t count, loff_t *ppos)

{

	struct ath_softc *sc = file->private_data;

	struct ath_hw *ah = sc->sc_ah;

	unsigned long val;

	char buf[32];

	ssize_t len;

	bool tpc_enabled;



	if (!AR_SREV_9300_20_OR_LATER(ah)) {

		/* ar9002 does not support TPC for the moment */

		return -EOPNOTSUPP;

	}



	len = min(count, sizeof(buf) - 1);

	if (copy_from_user(buf, user_buf, len))

		return -EFAULT;



	buf[len] = '\0';

	if (kstrtoul(buf, 0, &val))

		return -EINVAL;



	if (val < 0 || val > 1)

		return -EINVAL;



	tpc_enabled = !!val;



	if (tpc_enabled != ah->tpc_enabled) {

		ah->tpc_enabled = tpc_enabled;

		ath9k_hw_set_txpowerlimit(ah, sc->cur_chan->txpower, false);

	}



	return count;

}



static const struct file_operations fops_tpc = {

	.read = read_file_tpc,

	.write = write_file_tpc,

	.open = simple_open,

	.owner = THIS_MODULE,

	.llseek = default_llseek,

};



/* Ethtool support for get-stats */



#define AMKSTR(nm) #nm "_BE", #nm "_BK", #nm "_VI", #nm "_VO"
@@ -1324,6 +1393,8 @@ int ath9k_init_debug(struct ath_hw *ah) 
	debugfs_create_file("ack_to", S_IRUSR | S_IWUSR, sc->debug.debugfs_phy,

			    sc, &fops_ackto);

#endif

	debugfs_create_file("tpc", S_IRUSR | S_IWUSR,

			    sc->debug.debugfs_phy, sc, &fops_tpc);



	return 0;

}