Ever wondered why the signal was so bad with p54 compared to madwifi, or intel?
Well, if you have revision 1 rssi calibration curve points in your EEPROM, then wonder no more.
The firmware wants a extra 1 byte padding for every curve point. But someone forgot to put
them into the EEPROM's data structure...
So now, big question: what happens when we blindly "memcpy" these data points?
Signed-off-by: Christian Lamparter <chunkeey@xxxxxx>
---
John,
I think you should put this into -next... since the bug sounds more terrifying than it really is.
---
diff -Nurp a/drivers/net/wireless/p54/p54common.c b/drivers/net/wireless/p54/p54common.c
--- a/drivers/net/wireless/p54/p54common.c 2008-08-23 21:11:07.000000000 +0200
+++ b/drivers/net/wireless/p54/p54common.c 2008-08-23 21:13:37.000000000 +0200
@@ -155,14 +155,14 @@ void p54_parse_firmware(struct ieee80211
}
EXPORT_SYMBOL_GPL(p54_parse_firmware);
-static int p54_convert_rev0_to_rev1(struct ieee80211_hw *dev,
- struct pda_pa_curve_data *curve_data)
+static int p54_convert_rev0(struct ieee80211_hw *dev,
+ struct pda_pa_curve_data *curve_data)
{
struct p54_common *priv = dev->priv;
- struct pda_pa_curve_data_sample_rev1 *rev1;
- struct pda_pa_curve_data_sample_rev0 *rev0;
+ struct p54_pa_curve_data_sample *dst;
+ struct pda_pa_curve_data_sample_rev0 *src;
size_t cd_len = sizeof(*curve_data) +
- (curve_data->points_per_channel*sizeof(*rev1) + 2) *
+ (curve_data->points_per_channel*sizeof(*dst) + 2) *
curve_data->channels;
unsigned int i, j;
void *source, *target;
@@ -180,27 +180,63 @@ static int p54_convert_rev0_to_rev1(stru
*((__le16 *)target) = *freq;
target += sizeof(__le16);
for (j = 0; j < curve_data->points_per_channel; j++) {
- rev1 = target;
- rev0 = source;
+ dst = target;
+ src = source;
- rev1->rf_power = rev0->rf_power;
- rev1->pa_detector = rev0->pa_detector;
- rev1->data_64qam = rev0->pcv;
+ dst->rf_power = src->rf_power;
+ dst->pa_detector = src->pa_detector;
+ dst->data_64qam = src->pcv;
/* "invent" the points for the other modulations */
#define SUB(x,y) (u8)((x) - (y)) > (x) ? 0 : (x) - (y)
- rev1->data_16qam = SUB(rev0->pcv, 12);
- rev1->data_qpsk = SUB(rev1->data_16qam, 12);
- rev1->data_bpsk = SUB(rev1->data_qpsk, 12);
- rev1->data_barker= SUB(rev1->data_bpsk, 14);
+ dst->data_16qam = SUB(src->pcv, 12);
+ dst->data_qpsk = SUB(dst->data_16qam, 12);
+ dst->data_bpsk = SUB(dst->data_qpsk, 12);
+ dst->data_barker = SUB(dst->data_bpsk, 14);
#undef SUB
- target += sizeof(*rev1);
- source += sizeof(*rev0);
+ target += sizeof(*dst);
+ source += sizeof(*src);
}
}
return 0;
}
+static int p54_convert_rev1(struct ieee80211_hw *dev,
+ struct pda_pa_curve_data *curve_data)
+{
+ struct p54_common *priv = dev->priv;
+ struct p54_pa_curve_data_sample *dst;
+ struct pda_pa_curve_data_sample_rev1 *src;
+ size_t cd_len = sizeof(*curve_data) +
+ (curve_data->points_per_channel*sizeof(*dst) + 2) *
+ curve_data->channels;
+ unsigned int i, j;
+ void *source, *target;
+
+ priv->curve_data = kmalloc(cd_len, GFP_KERNEL);
+ if (!priv->curve_data)
+ return -ENOMEM;
+
+ memcpy(priv->curve_data, curve_data, sizeof(*curve_data));
+ source = curve_data->data;
+ target = priv->curve_data->data;
+ for (i = 0; i < curve_data->channels; i++) {
+ __le16 *freq = source;
+ source += sizeof(__le16);
+ *((__le16 *)target) = *freq;
+ target += sizeof(__le16);
+ for (j = 0; j < curve_data->points_per_channel; j++) {
+ memcpy(target, source, sizeof(*src));
+
+ target += sizeof(*dst);
+ source += sizeof(*src);
+ }
+ source++;
+ }
+
+ return 0;
+}
+
int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
{
struct p54_common *priv = dev->priv;
@@ -250,27 +286,32 @@ int p54_parse_eeprom(struct ieee80211_hw
entry->data[1]*sizeof(*priv->output_limit));
priv->output_limit_len = entry->data[1];
break;
- case PDR_PRISM_PA_CAL_CURVE_DATA:
- if (data_len < sizeof(struct pda_pa_curve_data)) {
+ case PDR_PRISM_PA_CAL_CURVE_DATA: {
+ struct pda_pa_curve_data *curve_data =
+ (struct pda_pa_curve_data *)entry->data;
+ if (data_len < sizeof(*curve_data)) {
err = -EINVAL;
goto err;
}
- if (((struct pda_pa_curve_data *)entry->data)->cal_method_rev) {
- priv->curve_data = kmalloc(data_len, GFP_KERNEL);
- if (!priv->curve_data) {
- err = -ENOMEM;
- goto err;
- }
-
- memcpy(priv->curve_data, entry->data, data_len);
- } else {
- err = p54_convert_rev0_to_rev1(dev, (struct pda_pa_curve_data *)entry->data);
- if (err)
- goto err;
+ switch (curve_data->cal_method_rev) {
+ case 0:
+ err = p54_convert_rev0(dev, curve_data);
+ break;
+ case 1:
+ err = p54_convert_rev1(dev, curve_data);
+ break;
+ default:
+ printk(KERN_ERR "p54: unknown curve data "
+ "revision %d\n",
+ curve_data->cal_method_rev);
+ err = -ENODEV;
+ break;
}
+ if (err)
+ goto err;
- break;
+ }
case PDR_PRISM_ZIF_TX_IQ_CALIBRATION:
priv->iq_autocal = kmalloc(data_len, GFP_KERNEL);
if (!priv->iq_autocal) {
@@ -672,12 +713,9 @@ static int p54_set_freq(struct ieee80211
struct p54_control_hdr *hdr;
struct p54_tx_control_channel *chan;
unsigned int i;
- size_t payload_len = sizeof(*chan) + sizeof(u32)*2 +
- sizeof(*chan->curve_data) *
- priv->curve_data->points_per_channel;
void *entry;
- hdr = kzalloc(sizeof(*hdr) + payload_len +
+ hdr = kzalloc(sizeof(*hdr) + sizeof(*chan) +
priv->tx_hdr_len, GFP_KERNEL);
if (!hdr)
return -ENOMEM;
@@ -689,10 +727,10 @@ static int p54_set_freq(struct ieee80211
hdr->magic1 = cpu_to_le16(0x8001);
hdr->len = cpu_to_le16(sizeof(*chan));
hdr->type = cpu_to_le16(P54_CONTROL_TYPE_CHANNEL_CHANGE);
- p54_assign_address(dev, NULL, hdr, sizeof(*hdr) + payload_len);
+ p54_assign_address(dev, NULL, hdr, sizeof(*hdr) + sizeof(*chan));
- chan->magic1 = cpu_to_le16(0x1);
- chan->magic2 = cpu_to_le16(0x0);
+ chan->flags = cpu_to_le16(0x1);
+ chan->dwell = cpu_to_le16(0x0);
for (i = 0; i < priv->iq_autocal_len; i++) {
if (priv->iq_autocal[i].freq != freq)
@@ -710,35 +748,41 @@ static int p54_set_freq(struct ieee80211
continue;
chan->val_barker = 0x38;
- chan->val_bpsk = priv->output_limit[i].val_bpsk;
- chan->val_qpsk = priv->output_limit[i].val_qpsk;
- chan->val_16qam = priv->output_limit[i].val_16qam;
- chan->val_64qam = priv->output_limit[i].val_64qam;
+ chan->val_bpsk = chan->dup_bpsk =
+ priv->output_limit[i].val_bpsk;
+ chan->val_qpsk = chan->dup_qpsk =
+ priv->output_limit[i].val_qpsk;
+ chan->val_16qam = chan->dup_16qam =
+ priv->output_limit[i].val_16qam;
+ chan->val_64qam = chan->dup_64qam =
+ priv->output_limit[i].val_64qam;
break;
}
if (i == priv->output_limit_len)
goto err;
- chan->pa_points_per_curve = priv->curve_data->points_per_channel;
-
entry = priv->curve_data->data;
for (i = 0; i < priv->curve_data->channels; i++) {
if (*((__le16 *)entry) != freq) {
entry += sizeof(__le16);
- entry += sizeof(struct pda_pa_curve_data_sample_rev1) *
- chan->pa_points_per_curve;
+ entry += sizeof(struct p54_pa_curve_data_sample) *
+ priv->curve_data->points_per_channel;
continue;
}
entry += sizeof(__le16);
+ chan->pa_points_per_curve =
+ min(priv->curve_data->points_per_channel, (u8) 8);
+
memcpy(chan->curve_data, entry, sizeof(*chan->curve_data) *
chan->pa_points_per_curve);
break;
}
- memcpy(hdr->data + payload_len - 4, &chan->val_bpsk, 4);
+ chan->rssical_mul = cpu_to_le16(130);
+ chan->rssical_add = cpu_to_le16(0xfe70); /* -400 */
- priv->tx(dev, hdr, sizeof(*hdr) + payload_len, 1);
+ priv->tx(dev, hdr, sizeof(*hdr) + sizeof(*chan), 1);
return 0;
err:
diff -Nurp a/drivers/net/wireless/p54/p54common.h b/drivers/net/wireless/p54/p54common.h
--- a/drivers/net/wireless/p54/p54common.h 2008-08-23 21:11:26.000000000 +0200
+++ b/drivers/net/wireless/p54/p54common.h 2008-08-23 21:10:49.000000000 +0200
@@ -89,6 +89,16 @@ struct pda_pa_curve_data_sample_rev1 {
u8 data_qpsk;
u8 data_16qam;
u8 data_64qam;
+} __attribute__ ((packed));
+
+struct p54_pa_curve_data_sample {
+ u8 rf_power;
+ u8 pa_detector;
+ u8 data_barker;
+ u8 data_bpsk;
+ u8 data_qpsk;
+ u8 data_16qam;
+ u8 data_64qam;
u8 padding;
} __attribute__ ((packed));
@@ -212,8 +222,8 @@ struct p54_tx_control_filter {
} __attribute__ ((packed));
struct p54_tx_control_channel {
- __le16 magic1;
- __le16 magic2;
+ __le16 flags;
+ __le16 dwell;
u8 padding1[20];
struct pda_iq_autocal_entry iq_autocal;
u8 pa_points_per_curve;
@@ -222,8 +232,13 @@ struct p54_tx_control_channel {
u8 val_qpsk;
u8 val_16qam;
u8 val_64qam;
- struct pda_pa_curve_data_sample_rev1 curve_data[0];
- /* additional padding/data after curve_data */
+ struct pda_pa_curve_data_sample_rev1 curve_data[8];
+ u8 dup_bpsk;
+ u8 dup_qpsk;
+ u8 dup_16qam;
+ u8 dup_64qam;
+ __le16 rssical_mul;
+ __le16 rssical_add;
} __attribute__ ((packed));
struct p54_tx_control_led {
--
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