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p54: fix rssi auto calibration

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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@web.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Christian Lamparter 2008-08-23 22:15:25 +02:00 committed by John W. Linville
parent a3ec233c90
commit 154e3af17f
2 changed files with 111 additions and 52 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

140
drivers/net/wireless/p54/p54common.c
View file

@ -155,14 +155,14 @@ void p54_parse_firmware(struct ieee80211_hw *dev, const struct firmware *fw)
} }
EXPORT_SYMBOL_GPL(p54_parse_firmware); EXPORT_SYMBOL_GPL(p54_parse_firmware);
static int p54_convert_rev0_to_rev1(struct ieee80211_hw *dev, static int p54_convert_rev0(struct ieee80211_hw *dev,
struct pda_pa_curve_data *curve_data) struct pda_pa_curve_data *curve_data)
{ {
struct p54_common *priv = dev->priv; struct p54_common *priv = dev->priv;
struct pda_pa_curve_data_sample_rev1 *rev1; struct p54_pa_curve_data_sample *dst;
struct pda_pa_curve_data_sample_rev0 *rev0; struct pda_pa_curve_data_sample_rev0 *src;
size_t cd_len = sizeof(*curve_data) + 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; curve_data->channels;
unsigned int i, j; unsigned int i, j;
void *source, *target; void *source, *target;
@ -180,27 +180,63 @@ static int p54_convert_rev0_to_rev1(struct ieee80211_hw *dev,
*((__le16 *)target) = *freq; *((__le16 *)target) = *freq;
target += sizeof(__le16); target += sizeof(__le16);
for (j = 0; j < curve_data->points_per_channel; j++) { for (j = 0; j < curve_data->points_per_channel; j++) {
rev1 = target; dst = target;
rev0 = source; src = source;
rev1->rf_power = rev0->rf_power; dst->rf_power = src->rf_power;
rev1->pa_detector = rev0->pa_detector; dst->pa_detector = src->pa_detector;
rev1->data_64qam = rev0->pcv; dst->data_64qam = src->pcv;
/* "invent" the points for the other modulations */ /* "invent" the points for the other modulations */
#define SUB(x,y) (u8)((x) - (y)) > (x) ? 0 : (x) - (y) #define SUB(x,y) (u8)((x) - (y)) > (x) ? 0 : (x) - (y)
rev1->data_16qam = SUB(rev0->pcv, 12); dst->data_16qam = SUB(src->pcv, 12);
rev1->data_qpsk = SUB(rev1->data_16qam, 12); dst->data_qpsk = SUB(dst->data_16qam, 12);
rev1->data_bpsk = SUB(rev1->data_qpsk, 12); dst->data_bpsk = SUB(dst->data_qpsk, 12);
rev1->data_barker= SUB(rev1->data_bpsk, 14); dst->data_barker = SUB(dst->data_bpsk, 14);
#undef SUB #undef SUB
target += sizeof(*rev1); target += sizeof(*dst);
source += sizeof(*rev0); source += sizeof(*src);
} }
} }
return 0; 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) int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
{ {
struct p54_common *priv = dev->priv; struct p54_common *priv = dev->priv;
@ -250,27 +286,32 @@ int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
entry->data[1]*sizeof(*priv->output_limit)); entry->data[1]*sizeof(*priv->output_limit));
priv->output_limit_len = entry->data[1]; priv->output_limit_len = entry->data[1];
break; break;
case PDR_PRISM_PA_CAL_CURVE_DATA: case PDR_PRISM_PA_CAL_CURVE_DATA: {
if (data_len < sizeof(struct pda_pa_curve_data)) { struct pda_pa_curve_data *curve_data =
(struct pda_pa_curve_data *)entry->data;
if (data_len < sizeof(*curve_data)) {
err = -EINVAL; err = -EINVAL;
goto err; goto err;
} }
if (((struct pda_pa_curve_data *)entry->data)->cal_method_rev) { switch (curve_data->cal_method_rev) {
priv->curve_data = kmalloc(data_len, GFP_KERNEL); case 0:
if (!priv->curve_data) { err = p54_convert_rev0(dev, curve_data);
err = -ENOMEM; break;
goto err; case 1:
} err = p54_convert_rev1(dev, curve_data);
break;
memcpy(priv->curve_data, entry->data, data_len); default:
} else { printk(KERN_ERR "p54: unknown curve data "
err = p54_convert_rev0_to_rev1(dev, (struct pda_pa_curve_data *)entry->data); "revision %d\n",
if (err) curve_data->cal_method_rev);
goto err; err = -ENODEV;
break;
} }
if (err)
goto err;
break; }
case PDR_PRISM_ZIF_TX_IQ_CALIBRATION: case PDR_PRISM_ZIF_TX_IQ_CALIBRATION:
priv->iq_autocal = kmalloc(data_len, GFP_KERNEL); priv->iq_autocal = kmalloc(data_len, GFP_KERNEL);
if (!priv->iq_autocal) { if (!priv->iq_autocal) {
@ -672,12 +713,9 @@ static int p54_set_freq(struct ieee80211_hw *dev, __le16 freq)
struct p54_control_hdr *hdr; struct p54_control_hdr *hdr;
struct p54_tx_control_channel *chan; struct p54_tx_control_channel *chan;
unsigned int i; unsigned int i;
size_t payload_len = sizeof(*chan) + sizeof(u32)*2 +
sizeof(*chan->curve_data) *
priv->curve_data->points_per_channel;
void *entry; void *entry;
hdr = kzalloc(sizeof(*hdr) + payload_len + hdr = kzalloc(sizeof(*hdr) + sizeof(*chan) +
priv->tx_hdr_len, GFP_KERNEL); priv->tx_hdr_len, GFP_KERNEL);
if (!hdr) if (!hdr)
return -ENOMEM; return -ENOMEM;
@ -689,10 +727,10 @@ static int p54_set_freq(struct ieee80211_hw *dev, __le16 freq)
hdr->magic1 = cpu_to_le16(0x8001); hdr->magic1 = cpu_to_le16(0x8001);
hdr->len = cpu_to_le16(sizeof(*chan)); hdr->len = cpu_to_le16(sizeof(*chan));
hdr->type = cpu_to_le16(P54_CONTROL_TYPE_CHANNEL_CHANGE); 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->flags = cpu_to_le16(0x1);
chan->magic2 = cpu_to_le16(0x0); chan->dwell = cpu_to_le16(0x0);
for (i = 0; i < priv->iq_autocal_len; i++) { for (i = 0; i < priv->iq_autocal_len; i++) {
if (priv->iq_autocal[i].freq != freq) if (priv->iq_autocal[i].freq != freq)
@ -710,35 +748,41 @@ static int p54_set_freq(struct ieee80211_hw *dev, __le16 freq)
continue; continue;
chan->val_barker = 0x38; chan->val_barker = 0x38;
chan->val_bpsk = priv->output_limit[i].val_bpsk; chan->val_bpsk = chan->dup_bpsk =
chan->val_qpsk = priv->output_limit[i].val_qpsk; priv->output_limit[i].val_bpsk;
chan->val_16qam = priv->output_limit[i].val_16qam; chan->val_qpsk = chan->dup_qpsk =
chan->val_64qam = priv->output_limit[i].val_64qam; 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; break;
} }
if (i == priv->output_limit_len) if (i == priv->output_limit_len)
goto err; goto err;
chan->pa_points_per_curve = priv->curve_data->points_per_channel;
entry = priv->curve_data->data; entry = priv->curve_data->data;
for (i = 0; i < priv->curve_data->channels; i++) { for (i = 0; i < priv->curve_data->channels; i++) {
if (*((__le16 *)entry) != freq) { if (*((__le16 *)entry) != freq) {
entry += sizeof(__le16); entry += sizeof(__le16);
entry += sizeof(struct pda_pa_curve_data_sample_rev1) * entry += sizeof(struct p54_pa_curve_data_sample) *
chan->pa_points_per_curve; priv->curve_data->points_per_channel;
continue; continue;
} }
entry += sizeof(__le16); 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) * memcpy(chan->curve_data, entry, sizeof(*chan->curve_data) *
chan->pa_points_per_curve); chan->pa_points_per_curve);
break; 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; return 0;
err: err:

23
drivers/net/wireless/p54/p54common.h
View file

@ -89,6 +89,16 @@ struct pda_pa_curve_data_sample_rev1 {
u8 data_qpsk; u8 data_qpsk;
u8 data_16qam; u8 data_16qam;
u8 data_64qam; 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; u8 padding;
} __attribute__ ((packed)); } __attribute__ ((packed));
@ -212,8 +222,8 @@ struct p54_tx_control_filter {
} __attribute__ ((packed)); } __attribute__ ((packed));
struct p54_tx_control_channel { struct p54_tx_control_channel {
__le16 magic1; __le16 flags;
__le16 magic2; __le16 dwell;
u8 padding1[20]; u8 padding1[20];
struct pda_iq_autocal_entry iq_autocal; struct pda_iq_autocal_entry iq_autocal;
u8 pa_points_per_curve; u8 pa_points_per_curve;
@ -222,8 +232,13 @@ struct p54_tx_control_channel {
u8 val_qpsk; u8 val_qpsk;
u8 val_16qam; u8 val_16qam;
u8 val_64qam; u8 val_64qam;
struct pda_pa_curve_data_sample_rev1 curve_data[0]; struct pda_pa_curve_data_sample_rev1 curve_data[8];
/* additional padding/data after curve_data */ u8 dup_bpsk;
u8 dup_qpsk;
u8 dup_16qam;
u8 dup_64qam;
__le16 rssical_mul;
__le16 rssical_add;
} __attribute__ ((packed)); } __attribute__ ((packed));
struct p54_tx_control_led { struct p54_tx_control_led {