forked from Minki/linux
p54: fix rssi auto calibration
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
John W. Linville
parent
a3ec233c90
commit
154e3af17f
@ -155,14 +155,14 @@ void p54_parse_firmware(struct ieee80211_hw *dev, const struct firmware *fw)
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}
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EXPORT_SYMBOL_GPL(p54_parse_firmware);
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static int p54_convert_rev0_to_rev1(struct ieee80211_hw *dev,
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struct pda_pa_curve_data *curve_data)
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static int p54_convert_rev0(struct ieee80211_hw *dev,
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struct pda_pa_curve_data *curve_data)
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{
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struct p54_common *priv = dev->priv;
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struct pda_pa_curve_data_sample_rev1 *rev1;
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struct pda_pa_curve_data_sample_rev0 *rev0;
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struct p54_pa_curve_data_sample *dst;
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struct pda_pa_curve_data_sample_rev0 *src;
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size_t cd_len = sizeof(*curve_data) +
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(curve_data->points_per_channel*sizeof(*rev1) + 2) *
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(curve_data->points_per_channel*sizeof(*dst) + 2) *
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curve_data->channels;
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unsigned int i, j;
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void *source, *target;
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@ -180,27 +180,63 @@ static int p54_convert_rev0_to_rev1(struct ieee80211_hw *dev,
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*((__le16 *)target) = *freq;
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target += sizeof(__le16);
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for (j = 0; j < curve_data->points_per_channel; j++) {
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rev1 = target;
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rev0 = source;
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dst = target;
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src = source;
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rev1->rf_power = rev0->rf_power;
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rev1->pa_detector = rev0->pa_detector;
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rev1->data_64qam = rev0->pcv;
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dst->rf_power = src->rf_power;
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dst->pa_detector = src->pa_detector;
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dst->data_64qam = src->pcv;
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/* "invent" the points for the other modulations */
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#define SUB(x,y) (u8)((x) - (y)) > (x) ? 0 : (x) - (y)
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rev1->data_16qam = SUB(rev0->pcv, 12);
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rev1->data_qpsk = SUB(rev1->data_16qam, 12);
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rev1->data_bpsk = SUB(rev1->data_qpsk, 12);
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rev1->data_barker= SUB(rev1->data_bpsk, 14);
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dst->data_16qam = SUB(src->pcv, 12);
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dst->data_qpsk = SUB(dst->data_16qam, 12);
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dst->data_bpsk = SUB(dst->data_qpsk, 12);
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dst->data_barker = SUB(dst->data_bpsk, 14);
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#undef SUB
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target += sizeof(*rev1);
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source += sizeof(*rev0);
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target += sizeof(*dst);
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source += sizeof(*src);
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}
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}
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return 0;
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}
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static int p54_convert_rev1(struct ieee80211_hw *dev,
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struct pda_pa_curve_data *curve_data)
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{
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struct p54_common *priv = dev->priv;
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struct p54_pa_curve_data_sample *dst;
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struct pda_pa_curve_data_sample_rev1 *src;
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size_t cd_len = sizeof(*curve_data) +
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(curve_data->points_per_channel*sizeof(*dst) + 2) *
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curve_data->channels;
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unsigned int i, j;
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void *source, *target;
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priv->curve_data = kmalloc(cd_len, GFP_KERNEL);
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if (!priv->curve_data)
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return -ENOMEM;
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memcpy(priv->curve_data, curve_data, sizeof(*curve_data));
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source = curve_data->data;
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target = priv->curve_data->data;
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for (i = 0; i < curve_data->channels; i++) {
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__le16 *freq = source;
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source += sizeof(__le16);
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*((__le16 *)target) = *freq;
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target += sizeof(__le16);
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for (j = 0; j < curve_data->points_per_channel; j++) {
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memcpy(target, source, sizeof(*src));
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target += sizeof(*dst);
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source += sizeof(*src);
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}
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source++;
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}
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return 0;
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}
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int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
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{
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struct p54_common *priv = dev->priv;
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@ -250,27 +286,32 @@ int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len)
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entry->data[1]*sizeof(*priv->output_limit));
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priv->output_limit_len = entry->data[1];
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break;
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case PDR_PRISM_PA_CAL_CURVE_DATA:
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if (data_len < sizeof(struct pda_pa_curve_data)) {
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case PDR_PRISM_PA_CAL_CURVE_DATA: {
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struct pda_pa_curve_data *curve_data =
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(struct pda_pa_curve_data *)entry->data;
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if (data_len < sizeof(*curve_data)) {
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err = -EINVAL;
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goto err;
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}
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if (((struct pda_pa_curve_data *)entry->data)->cal_method_rev) {
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priv->curve_data = kmalloc(data_len, GFP_KERNEL);
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if (!priv->curve_data) {
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err = -ENOMEM;
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goto err;
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}
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memcpy(priv->curve_data, entry->data, data_len);
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} else {
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err = p54_convert_rev0_to_rev1(dev, (struct pda_pa_curve_data *)entry->data);
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if (err)
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goto err;
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switch (curve_data->cal_method_rev) {
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case 0:
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err = p54_convert_rev0(dev, curve_data);
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break;
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case 1:
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err = p54_convert_rev1(dev, curve_data);
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break;
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default:
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printk(KERN_ERR "p54: unknown curve data "
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"revision %d\n",
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curve_data->cal_method_rev);
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err = -ENODEV;
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break;
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}
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if (err)
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goto err;
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break;
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}
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case PDR_PRISM_ZIF_TX_IQ_CALIBRATION:
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priv->iq_autocal = kmalloc(data_len, GFP_KERNEL);
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if (!priv->iq_autocal) {
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@ -672,12 +713,9 @@ static int p54_set_freq(struct ieee80211_hw *dev, __le16 freq)
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struct p54_control_hdr *hdr;
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struct p54_tx_control_channel *chan;
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unsigned int i;
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size_t payload_len = sizeof(*chan) + sizeof(u32)*2 +
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sizeof(*chan->curve_data) *
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priv->curve_data->points_per_channel;
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void *entry;
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hdr = kzalloc(sizeof(*hdr) + payload_len +
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hdr = kzalloc(sizeof(*hdr) + sizeof(*chan) +
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priv->tx_hdr_len, GFP_KERNEL);
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if (!hdr)
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return -ENOMEM;
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@ -689,10 +727,10 @@ static int p54_set_freq(struct ieee80211_hw *dev, __le16 freq)
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hdr->magic1 = cpu_to_le16(0x8001);
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hdr->len = cpu_to_le16(sizeof(*chan));
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hdr->type = cpu_to_le16(P54_CONTROL_TYPE_CHANNEL_CHANGE);
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p54_assign_address(dev, NULL, hdr, sizeof(*hdr) + payload_len);
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p54_assign_address(dev, NULL, hdr, sizeof(*hdr) + sizeof(*chan));
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chan->magic1 = cpu_to_le16(0x1);
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chan->magic2 = cpu_to_le16(0x0);
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chan->flags = cpu_to_le16(0x1);
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chan->dwell = cpu_to_le16(0x0);
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for (i = 0; i < priv->iq_autocal_len; i++) {
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if (priv->iq_autocal[i].freq != freq)
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@ -710,35 +748,41 @@ static int p54_set_freq(struct ieee80211_hw *dev, __le16 freq)
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continue;
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chan->val_barker = 0x38;
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chan->val_bpsk = priv->output_limit[i].val_bpsk;
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chan->val_qpsk = priv->output_limit[i].val_qpsk;
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chan->val_16qam = priv->output_limit[i].val_16qam;
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chan->val_64qam = priv->output_limit[i].val_64qam;
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chan->val_bpsk = chan->dup_bpsk =
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priv->output_limit[i].val_bpsk;
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chan->val_qpsk = chan->dup_qpsk =
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priv->output_limit[i].val_qpsk;
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chan->val_16qam = chan->dup_16qam =
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priv->output_limit[i].val_16qam;
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chan->val_64qam = chan->dup_64qam =
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priv->output_limit[i].val_64qam;
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break;
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}
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if (i == priv->output_limit_len)
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goto err;
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chan->pa_points_per_curve = priv->curve_data->points_per_channel;
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entry = priv->curve_data->data;
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for (i = 0; i < priv->curve_data->channels; i++) {
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if (*((__le16 *)entry) != freq) {
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entry += sizeof(__le16);
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entry += sizeof(struct pda_pa_curve_data_sample_rev1) *
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chan->pa_points_per_curve;
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entry += sizeof(struct p54_pa_curve_data_sample) *
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priv->curve_data->points_per_channel;
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continue;
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}
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entry += sizeof(__le16);
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chan->pa_points_per_curve =
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min(priv->curve_data->points_per_channel, (u8) 8);
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memcpy(chan->curve_data, entry, sizeof(*chan->curve_data) *
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chan->pa_points_per_curve);
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break;
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}
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memcpy(hdr->data + payload_len - 4, &chan->val_bpsk, 4);
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chan->rssical_mul = cpu_to_le16(130);
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chan->rssical_add = cpu_to_le16(0xfe70); /* -400 */
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priv->tx(dev, hdr, sizeof(*hdr) + payload_len, 1);
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priv->tx(dev, hdr, sizeof(*hdr) + sizeof(*chan), 1);
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return 0;
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err:
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@ -89,6 +89,16 @@ struct pda_pa_curve_data_sample_rev1 {
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u8 data_qpsk;
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u8 data_16qam;
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u8 data_64qam;
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} __attribute__ ((packed));
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struct p54_pa_curve_data_sample {
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u8 rf_power;
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u8 pa_detector;
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u8 data_barker;
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u8 data_bpsk;
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u8 data_qpsk;
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u8 data_16qam;
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u8 data_64qam;
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u8 padding;
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} __attribute__ ((packed));
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@ -212,8 +222,8 @@ struct p54_tx_control_filter {
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} __attribute__ ((packed));
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struct p54_tx_control_channel {
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__le16 magic1;
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__le16 magic2;
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__le16 flags;
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__le16 dwell;
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u8 padding1[20];
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struct pda_iq_autocal_entry iq_autocal;
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u8 pa_points_per_curve;
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@ -222,8 +232,13 @@ struct p54_tx_control_channel {
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u8 val_qpsk;
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u8 val_16qam;
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u8 val_64qam;
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struct pda_pa_curve_data_sample_rev1 curve_data[0];
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/* additional padding/data after curve_data */
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struct pda_pa_curve_data_sample_rev1 curve_data[8];
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u8 dup_bpsk;
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u8 dup_qpsk;
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u8 dup_16qam;
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u8 dup_64qam;
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__le16 rssical_mul;
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__le16 rssical_add;
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} __attribute__ ((packed));
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struct p54_tx_control_led {
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