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This adds a bwmode debugfs file which can be used to set alternate
channel operating bandwidths. Only tested with AR5413 and only at
5 and 20 mhz channels.
Signed-off-by: Pat Erley <pat-lkml at erley.org>
---
Other devices will need to be added to the switch in write_file_bwmode
drivers/net/wireless/ath/ath5k/debug.c | 86 ++++++++++++++++++++++++++++++++
1 files changed, 86 insertions(+), 0 deletions(-)
--- a/drivers/net/wireless/ath/ath5k/debug.c
+++ b/drivers/net/wireless/ath/ath5k/debug.c
@@ -822,6 +822,97 @@ static const struct file_operations fops
.llseek = default_llseek,
};
+/* debugfs: bwmode */
+
+static ssize_t read_file_bwmode(struct file *file, char __user *user_buf,
+ size_t count, loff_t *ppos)
+{
+ struct ath5k_hw *ah = file->private_data;
+ char buf[15];
+ unsigned int len = 0;
+
+ int cur_ah_bwmode = ah->ah_bwmode_debug;
+
+#define print_selected(MODE, LABEL) \
+ if (cur_ah_bwmode == MODE) \
+ len += snprintf(buf+len, sizeof(buf)-len, "[%s]", LABEL); \
+ else \
+ len += snprintf(buf+len, sizeof(buf)-len, "%s", LABEL); \
+ len += snprintf(buf+len, sizeof(buf)-len, " ");
+
+ print_selected(AR5K_BWMODE_5MHZ, "5");
+ print_selected(AR5K_BWMODE_10MHZ, "10");
+ print_selected(AR5K_BWMODE_DEFAULT, "20");
+ print_selected(AR5K_BWMODE_40MHZ, "40");
+#undef print_selected
+
+ len += snprintf(buf+len, sizeof(buf)-len, "\n");
+
+ return simple_read_from_buffer(user_buf, count, ppos, buf, len);
+}
+
+static ssize_t write_file_bwmode(struct file *file,
+ const char __user *userbuf,
+ size_t count, loff_t *ppos)
+{
+ struct ath5k_hw *ah = file->private_data;
+ char buf[3];
+ int bw = 20;
+ int tobwmode = AR5K_BWMODE_DEFAULT;
+
+ if (copy_from_user(buf, userbuf, min(count, sizeof(buf))))
+ return -EFAULT;
+
+ /* TODO: Add check for active interface */
+
+ if(strncmp(buf, "5", 1) == 0 ) {
+ tobwmode = AR5K_BWMODE_5MHZ;
+ bw = 5;
+ } else if ( strncmp(buf, "10", 2) == 0 ) {
+ tobwmode = AR5K_BWMODE_10MHZ;
+ bw = 10;
+ } else if ( strncmp(buf, "20", 2) == 0 ) {
+ tobwmode = AR5K_BWMODE_DEFAULT;
+ bw = 20;
+ } else if ( strncmp(buf, "40", 2) == 0 ) {
+ tobwmode = AR5K_BWMODE_40MHZ;
+ bw = 40;
+ } else
+ return -EINVAL;
+
+ ATH5K_INFO(ah, "Changing to %imhz channel width[%i]\n",
+ bw, tobwmode);
+
+ switch (ah->ah_radio) {
+ /* TODO: only define radios that actually support 5/10mhz channels */
+ case AR5K_RF5413:
+ case AR5K_RF5110:
+ case AR5K_RF5111:
+ case AR5K_RF5112:
+ case AR5K_RF2413:
+ case AR5K_RF2316:
+ case AR5K_RF2317:
+ case AR5K_RF2425:
+ if(ah->ah_bwmode_debug != tobwmode) {
+ mutex_lock(&ah->lock);
+ ah->ah_bwmode = tobwmode;
+ ah->ah_bwmode_debug = tobwmode;
+ mutex_unlock(&ah->lock);
+ }
+ break;
+ default:
+ return -EOPNOTSUPP;
+ }
+ return count;
+}
+
+static const struct file_operations fops_bwmode = {
+ .read = read_file_bwmode,
+ .write = write_file_bwmode,
+ .open = simple_open,
+ .owner = THIS_MODULE,
+ .llseek = default_llseek,
+};
/* debugfs: queues etc */
@@ -1009,6 +1100,9 @@ ath5k_debug_init_device(struct ath5k_hw
debugfs_create_file("beacon", S_IWUSR | S_IRUSR, phydir, ah,
&fops_beacon);
+ debugfs_create_file("bwmode", S_IWUSR | S_IRUSR, phydir, ah,
+ &fops_bwmode);
+
debugfs_create_file("reset", S_IWUSR, phydir, ah, &fops_reset);
debugfs_create_file("antenna", S_IWUSR | S_IRUSR, phydir, ah,
--- a/drivers/net/wireless/ath/ath5k/ath5k.h
+++ b/drivers/net/wireless/ath/ath5k/ath5k.h
@@ -1372,6 +1372,7 @@ struct ath5k_hw {
u8 ah_coverage_class;
bool ah_ack_bitrate_high;
u8 ah_bwmode;
+ u8 ah_bwmode_debug;
bool ah_short_slot;
/* Antenna Control */
--- a/drivers/net/wireless/ath/ath5k/base.c
+++ b/drivers/net/wireless/ath/ath5k/base.c
@@ -466,6 +466,9 @@ ath5k_chan_set(struct ath5k_hw *ah, stru
return -EINVAL;
}
+ if (ah->ah_bwmode_debug != AR5K_BWMODE_DEFAULT)
+ ah->ah_bwmode = ah->ah_bwmode_debug;
+
/*
* To switch channels clear any pending DMA operations;
* wait long enough for the RX fifo to drain, reset the
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