rt2x00: Implement tx power temperature compensation

rt2800 devices should adjust their tx power in accordance with the
eeproms temperature calibration values. Add a new driver callback
gain_calibration that is called every 4 seconds.

The rt2800 gain calibration routine simply runs the tx power
configuration that takes care of calculating the temperature
compensation delta.

We don't need to synchronize the calls to rt2800_config_txpower
as they should all happen from mac80211's single threaded workqueue.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 106 insertions, 0 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2800.h b/drivers/net/wireless/rt2x00/rt2800.h
index 70b9abbdeb9e..3b3d851fe266 100644
--- a/drivers/net/wireless/rt2x00/rt2800.h
+++ b/drivers/net/wireless/rt2x00/rt2800.h
@@ -2104,6 +2104,59 @@ struct mac_iveiv_entry {
 #define EEPROM_TXPOWER_BG_2		FIELD16(0xff00)
 
 /*
+ * EEPROM temperature compensation boundaries 802.11BG
+ * MINUS4: If the actual TSSI is below this boundary, tx power needs to be
+ *         reduced by (agc_step * -4)
+ * MINUS3: If the actual TSSI is below this boundary, tx power needs to be
+ *         reduced by (agc_step * -3)
+ */
+#define EEPROM_TSSI_BOUND_BG1		0x0037
+#define EEPROM_TSSI_BOUND_BG1_MINUS4	FIELD16(0x00ff)
+#define EEPROM_TSSI_BOUND_BG1_MINUS3	FIELD16(0xff00)
+
+/*
+ * EEPROM temperature compensation boundaries 802.11BG
+ * MINUS2: If the actual TSSI is below this boundary, tx power needs to be
+ *         reduced by (agc_step * -2)
+ * MINUS1: If the actual TSSI is below this boundary, tx power needs to be
+ *         reduced by (agc_step * -1)
+ */
+#define EEPROM_TSSI_BOUND_BG2		0x0038
+#define EEPROM_TSSI_BOUND_BG2_MINUS2	FIELD16(0x00ff)
+#define EEPROM_TSSI_BOUND_BG2_MINUS1	FIELD16(0xff00)
+
+/*
+ * EEPROM temperature compensation boundaries 802.11BG
+ * REF: Reference TSSI value, no tx power changes needed
+ * PLUS1: If the actual TSSI is above this boundary, tx power needs to be
+ *        increased by (agc_step * 1)
+ */
+#define EEPROM_TSSI_BOUND_BG3		0x0039
+#define EEPROM_TSSI_BOUND_BG3_REF	FIELD16(0x00ff)
+#define EEPROM_TSSI_BOUND_BG3_PLUS1	FIELD16(0xff00)
+
+/*
+ * EEPROM temperature compensation boundaries 802.11BG
+ * PLUS2: If the actual TSSI is above this boundary, tx power needs to be
+ *        increased by (agc_step * 2)
+ * PLUS3: If the actual TSSI is above this boundary, tx power needs to be
+ *        increased by (agc_step * 3)
+ */
+#define EEPROM_TSSI_BOUND_BG4		0x003a
+#define EEPROM_TSSI_BOUND_BG4_PLUS2	FIELD16(0x00ff)
+#define EEPROM_TSSI_BOUND_BG4_PLUS3	FIELD16(0xff00)
+
+/*
+ * EEPROM temperature compensation boundaries 802.11BG
+ * PLUS4: If the actual TSSI is above this boundary, tx power needs to be
+ *        increased by (agc_step * 4)
+ * AGC_STEP: Temperature compensation step.
+ */
+#define EEPROM_TSSI_BOUND_BG5		0x003b
+#define EEPROM_TSSI_BOUND_BG5_PLUS4	FIELD16(0x00ff)
+#define EEPROM_TSSI_BOUND_BG5_AGC_STEP	FIELD16(0xff00)
+
+/*
  * EEPROM TXPOWER 802.11A
  */
 #define EEPROM_TXPOWER_A1		0x003c
@@ -2113,6 +2166,59 @@ struct mac_iveiv_entry {
 #define EEPROM_TXPOWER_A_2		FIELD16(0xff00)
 
 /*
+ * EEPROM temperature compensation boundaries 802.11A
+ * MINUS4: If the actual TSSI is below this boundary, tx power needs to be
+ *         reduced by (agc_step * -4)
+ * MINUS3: If the actual TSSI is below this boundary, tx power needs to be
+ *         reduced by (agc_step * -3)
+ */
+#define EEPROM_TSSI_BOUND_A1		0x006a
+#define EEPROM_TSSI_BOUND_A1_MINUS4	FIELD16(0x00ff)
+#define EEPROM_TSSI_BOUND_A1_MINUS3	FIELD16(0xff00)
+
+/*
+ * EEPROM temperature compensation boundaries 802.11A
+ * MINUS2: If the actual TSSI is below this boundary, tx power needs to be
+ *         reduced by (agc_step * -2)
+ * MINUS1: If the actual TSSI is below this boundary, tx power needs to be
+ *         reduced by (agc_step * -1)
+ */
+#define EEPROM_TSSI_BOUND_A2		0x006b
+#define EEPROM_TSSI_BOUND_A2_MINUS2	FIELD16(0x00ff)
+#define EEPROM_TSSI_BOUND_A2_MINUS1	FIELD16(0xff00)
+
+/*
+ * EEPROM temperature compensation boundaries 802.11A
+ * REF: Reference TSSI value, no tx power changes needed
+ * PLUS1: If the actual TSSI is above this boundary, tx power needs to be
+ *        increased by (agc_step * 1)
+ */
+#define EEPROM_TSSI_BOUND_A3		0x006c
+#define EEPROM_TSSI_BOUND_A3_REF	FIELD16(0x00ff)
+#define EEPROM_TSSI_BOUND_A3_PLUS1	FIELD16(0xff00)
+
+/*
+ * EEPROM temperature compensation boundaries 802.11A
+ * PLUS2: If the actual TSSI is above this boundary, tx power needs to be
+ *        increased by (agc_step * 2)
+ * PLUS3: If the actual TSSI is above this boundary, tx power needs to be
+ *        increased by (agc_step * 3)
+ */
+#define EEPROM_TSSI_BOUND_A4		0x006d
+#define EEPROM_TSSI_BOUND_A4_PLUS2	FIELD16(0x00ff)
+#define EEPROM_TSSI_BOUND_A4_PLUS3	FIELD16(0xff00)
+
+/*
+ * EEPROM temperature compensation boundaries 802.11A
+ * PLUS4: If the actual TSSI is above this boundary, tx power needs to be
+ *        increased by (agc_step * 4)
+ * AGC_STEP: Temperature compensation step.
+ */
+#define EEPROM_TSSI_BOUND_A5		0x006e
+#define EEPROM_TSSI_BOUND_A5_PLUS4	FIELD16(0x00ff)
+#define EEPROM_TSSI_BOUND_A5_AGC_STEP	FIELD16(0xff00)
+
+/*
  * EEPROM TXPOWER by rate: tx power per tx rate for HT20 mode
  */
 #define EEPROM_TXPOWER_BYRATE		0x006f