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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(-)
- Index: backports-v4.18-rc7/drivers/net/wireless/ath/ath5k/debug.c
- ===================================================================
- --- backports-v4.18-rc7.orig/drivers/net/wireless/ath/ath5k/debug.c
- +++ backports-v4.18-rc7/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 */
-
- @@ -1016,6 +1107,8 @@ ath5k_debug_init_device(struct ath5k_hw
- debugfs_create_file("queue", 0600, phydir, ah, &fops_queue);
- debugfs_create_bool("32khz_clock", 0600, phydir,
- &ah->ah_use_32khz_clock);
- + debugfs_create_file("bwmode", S_IWUSR | S_IRUSR, phydir, ah,
- + &fops_bwmode);
- }
-
- /* functions used in other places */
- Index: backports-v4.18-rc7/drivers/net/wireless/ath/ath5k/ath5k.h
- ===================================================================
- --- backports-v4.18-rc7.orig/drivers/net/wireless/ath/ath5k/ath5k.h
- +++ backports-v4.18-rc7/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 */
- Index: backports-v4.18-rc7/drivers/net/wireless/ath/ath5k/base.c
- ===================================================================
- --- backports-v4.18-rc7.orig/drivers/net/wireless/ath/ath5k/base.c
- +++ backports-v4.18-rc7/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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