From 69ba3e5d74a467a64248cd90ccafb524b1fddcb5 Mon Sep 17 00:00:00 2001 From: Christian Lamparter Date: Sun, 14 Dec 2008 14:45:30 +0100 Subject: [PATCH] p54: more accurate rssi to dBm conversion This patch replaces the static rssi auto calibration data with more precise values out of the device's eeprom. Signed-off-by: Christian Lamparter Signed-off-by: John W. Linville --- drivers/net/wireless/p54/p54.h | 8 ++++ drivers/net/wireless/p54/p54common.c | 69 ++++++++++++++++++++-------- drivers/net/wireless/p54/p54common.h | 17 +++---- 3 files changed, 68 insertions(+), 26 deletions(-) diff --git a/drivers/net/wireless/p54/p54.h b/drivers/net/wireless/p54/p54.h index 23b80ef4d01..e0a68815a47 100644 --- a/drivers/net/wireless/p54/p54.h +++ b/drivers/net/wireless/p54/p54.h @@ -61,6 +61,13 @@ struct p54_edcf_queue_param { __le16 txop; } __attribute__ ((packed)); +struct p54_rssi_linear_approximation { + s16 mul; + s16 add; + s16 longbow_unkn; + s16 longbow_unk2; +}; + #define EEPROM_READBACK_LEN 0x3fc #define ISL38XX_DEV_FIRMWARE_ADDR 0x20000 @@ -91,6 +98,7 @@ struct p54_common { struct pda_channel_output_limit *output_limit; unsigned int output_limit_len; struct pda_pa_curve_data *curve_data; + struct p54_rssi_linear_approximation rssical_db[IEEE80211_NUM_BANDS]; unsigned int filter_flags; bool use_short_slot; u16 rxhw; diff --git a/drivers/net/wireless/p54/p54common.c b/drivers/net/wireless/p54/p54common.c index ddb858608a5..05eb677aa3e 100644 --- a/drivers/net/wireless/p54/p54common.c +++ b/drivers/net/wireless/p54/p54common.c @@ -335,6 +335,36 @@ static const char *p54_rf_chips[] = { "NULL", "Duette3", "Duette2", "Frisbee", "Xbow", "Longbow", "NULL", "NULL" }; static int p54_init_xbow_synth(struct ieee80211_hw *dev); +static void p54_parse_rssical(struct ieee80211_hw *dev, void *data, int len, + u16 type) +{ + struct p54_common *priv = dev->priv; + int offset = (type == PDR_RSSI_LINEAR_APPROXIMATION_EXTENDED) ? 2 : 0; + int entry_size = sizeof(struct pda_rssi_cal_entry) + offset; + int num_entries = (type == PDR_RSSI_LINEAR_APPROXIMATION) ? 1 : 2; + int i; + + if (len != (entry_size * num_entries)) { + printk(KERN_ERR "%s: unknown rssi calibration data packing " + " type:(%x) len:%d.\n", + wiphy_name(dev->wiphy), type, len); + + print_hex_dump_bytes("rssical:", DUMP_PREFIX_NONE, + data, len); + + printk(KERN_ERR "%s: please report this issue.\n", + wiphy_name(dev->wiphy)); + return; + } + + for (i = 0; i < num_entries; i++) { + struct pda_rssi_cal_entry *cal = data + + (offset + i * entry_size); + priv->rssical_db[i].mul = (s16) le16_to_cpu(cal->mul); + priv->rssical_db[i].add = (s16) le16_to_cpu(cal->add); + } +} + static int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len) { struct p54_common *priv = dev->priv; @@ -434,6 +464,12 @@ static int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len) case PDR_HARDWARE_PLATFORM_COMPONENT_ID: priv->version = *(u8 *)(entry->data + 1); break; + case PDR_RSSI_LINEAR_APPROXIMATION: + case PDR_RSSI_LINEAR_APPROXIMATION_DUAL_BAND: + case PDR_RSSI_LINEAR_APPROXIMATION_EXTENDED: + p54_parse_rssical(dev, entry->data, data_len, + le16_to_cpu(entry->code)); + break; case PDR_END: /* make it overrun */ entry_len = len; @@ -453,10 +489,7 @@ static int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len) case PDR_DEFAULT_COUNTRY: case PDR_ANTENNA_GAIN: case PDR_PRISM_INDIGO_PA_CALIBRATION_DATA: - case PDR_RSSI_LINEAR_APPROXIMATION: - case PDR_RSSI_LINEAR_APPROXIMATION_DUAL_BAND: case PDR_REGULATORY_POWER_LIMITS: - case PDR_RSSI_LINEAR_APPROXIMATION_EXTENDED: case PDR_RADIATED_TRANSMISSION_CORRECTION: case PDR_PRISM_TX_IQ_CALIBRATION: case PDR_BASEBAND_REGISTERS: @@ -527,8 +560,11 @@ static int p54_parse_eeprom(struct ieee80211_hw *dev, void *eeprom, int len) static int p54_rssi_to_dbm(struct ieee80211_hw *dev, int rssi) { - /* TODO: get the rssi_add & rssi_mul data from the eeprom */ - return ((rssi * 0x83) / 64 - 400) / 4; + struct p54_common *priv = dev->priv; + int band = dev->conf.channel->band; + + return ((rssi * priv->rssical_db[band].mul) / 64 + + priv->rssical_db[band].add) / 4; } static int p54_rx_data(struct ieee80211_hw *dev, struct sk_buff *skb) @@ -1466,15 +1502,15 @@ static int p54_setup_mac(struct ieee80211_hw *dev) return 0; } -static int p54_scan(struct ieee80211_hw *dev, u16 mode, u16 dwell, - u16 frequency) +static int p54_scan(struct ieee80211_hw *dev, u16 mode, u16 dwell) { struct p54_common *priv = dev->priv; struct sk_buff *skb; struct p54_scan *chan; unsigned int i; void *entry; - __le16 freq = cpu_to_le16(frequency); + __le16 freq = cpu_to_le16(dev->conf.channel->center_freq); + int band = dev->conf.channel->band; skb = p54_alloc_skb(dev, P54_HDR_FLAG_CONTROL_OPSET, sizeof(*chan) + sizeof(struct p54_hdr), P54_CONTROL_TYPE_SCAN, @@ -1535,11 +1571,11 @@ static int p54_scan(struct ieee80211_hw *dev, u16 mode, u16 dwell, } if (priv->fw_var < 0x500) { - chan->v1.rssical_mul = cpu_to_le16(130); - chan->v1.rssical_add = cpu_to_le16(0xfe70); + chan->v1_rssi.mul = cpu_to_le16(priv->rssical_db[band].mul); + chan->v1_rssi.add = cpu_to_le16(priv->rssical_db[band].add); } else { - chan->v2.rssical_mul = cpu_to_le16(130); - chan->v2.rssical_add = cpu_to_le16(0xfe70); + chan->v2.rssi.mul = cpu_to_le16(priv->rssical_db[band].mul); + chan->v2.rssi.add = cpu_to_le16(priv->rssical_db[band].add); chan->v2.basic_rate_mask = cpu_to_le32(priv->basic_rate_mask); memset(chan->v2.rts_rates, 0, 8); } @@ -1801,8 +1837,7 @@ static int p54_config(struct ieee80211_hw *dev, u32 changed) goto out; } if (changed & IEEE80211_CONF_CHANGE_CHANNEL) { - ret = p54_scan(dev, P54_SCAN_EXIT, 0, - conf->channel->center_freq); + ret = p54_scan(dev, P54_SCAN_EXIT, 0); if (ret) goto out; } @@ -1828,8 +1863,7 @@ static int p54_config_interface(struct ieee80211_hw *dev, } if (conf->changed & IEEE80211_IFCC_BEACON) { - ret = p54_scan(dev, P54_SCAN_EXIT, 0, - dev->conf.channel->center_freq); + ret = p54_scan(dev, P54_SCAN_EXIT, 0); if (ret) goto out; ret = p54_setup_mac(dev); @@ -1968,8 +2002,7 @@ static void p54_bss_info_changed(struct ieee80211_hw *dev, priv->basic_rate_mask = info->basic_rates; p54_setup_mac(dev); if (priv->fw_var >= 0x500) - p54_scan(dev, P54_SCAN_EXIT, 0, - dev->conf.channel->center_freq); + p54_scan(dev, P54_SCAN_EXIT, 0); } if (changed & BSS_CHANGED_ASSOC) { if (info->assoc) { diff --git a/drivers/net/wireless/p54/p54common.h b/drivers/net/wireless/p54/p54common.h index 06e1643cc29..6c824e40f3b 100644 --- a/drivers/net/wireless/p54/p54common.h +++ b/drivers/net/wireless/p54/p54common.h @@ -178,6 +178,11 @@ struct pda_pa_curve_data { u8 data[0]; } __attribute__ ((packed)); +struct pda_rssi_cal_entry { + __le16 mul; + __le16 add; +} __attribute__ ((packed)); + /* * this defines the PDR codes used to build PDAs as defined in document * number 553155. The current implementation mirrors version 1.1 of the @@ -429,22 +434,18 @@ struct p54_scan { u8 dup_16qam; u8 dup_64qam; union { - struct { - __le16 rssical_mul; - __le16 rssical_add; - } v1 __attribute__ ((packed)); + struct pda_rssi_cal_entry v1_rssi; struct { __le32 basic_rate_mask; u8 rts_rates[8]; - __le16 rssical_mul; - __le16 rssical_add; + struct pda_rssi_cal_entry rssi; } v2 __attribute__ ((packed)); } __attribute__ ((packed)); } __attribute__ ((packed)); -#define P54_SCAN_V1_LEN (sizeof(struct p54_scan)-12) -#define P54_SCAN_V2_LEN (sizeof(struct p54_scan)) +#define P54_SCAN_V1_LEN 0x70 +#define P54_SCAN_V2_LEN 0x7c struct p54_led { __le16 mode; -- 2.41.1