Return-path: Received: from mail-wi0-f170.google.com ([209.85.212.170]:40419 "EHLO mail-wi0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751230AbaLRXSS (ORCPT ); Thu, 18 Dec 2014 18:18:18 -0500 Received: by mail-wi0-f170.google.com with SMTP id bs8so3115706wib.5 for ; Thu, 18 Dec 2014 15:18:17 -0800 (PST) From: Lorenzo Bianconi To: linux-wireless@vger.kernel.org Cc: nbd@openwrt.org, thomas@net.t-labs.tu-berlin.de Subject: [PATCH 2/3] ath9k: add debugfs support for hw TPC Date: Fri, 19 Dec 2014 00:18:13 +0100 Message-Id: <1418944694-10614-3-git-send-email-lorenzo.bianconi83@gmail.com> (sfid-20141219_001825_118652_CC42952C) In-Reply-To: <1418944694-10614-1-git-send-email-lorenzo.bianconi83@gmail.com> References: <1418944694-10614-1-git-send-email-lorenzo.bianconi83@gmail.com> Sender: linux-wireless-owner@vger.kernel.org List-ID: Add tpc entry to ath9k debugfs in order to enable/disable hw TPC Signed-off-by: Lorenzo Bianconi --- drivers/net/wireless/ath/ath9k/debug.c | 71 ++++++++++++++++++++++++++++++++++ 1 file changed, 71 insertions(+) diff --git a/drivers/net/wireless/ath/ath9k/debug.c b/drivers/net/wireless/ath/ath9k/debug.c index 696e3d5..346290a 100644 --- a/drivers/net/wireless/ath/ath9k/debug.c +++ b/drivers/net/wireless/ath/ath9k/debug.c @@ -1188,6 +1188,75 @@ 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" @@ -1397,6 +1466,8 @@ 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; } -- 2.1.0