rt2x00: Add RFKILL support to rt2500usb and rt73usb

Some very rare Ralink USB hardware exists which features
the RFKILL switch on the USB stick.
This patch adds the EEPROM check function to see if RFKILL
is supported and the polling function to rt2500usb and
rt73usb in order to support RFKILL for that hardware.

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

4 files changed, 63 insertions, 0 deletions

diff --git a/drivers/net/wireless/rt2x00/rt2500usb.c b/drivers/net/wireless/rt2x00/rt2500usb.c
index 557fcf2b30e4..01e5584d8f77 100644
--- a/drivers/net/wireless/rt2x00/rt2500usb.c
+++ b/drivers/net/wireless/rt2x00/rt2500usb.c
@@ -280,6 +280,18 @@ static const struct rt2x00debug rt2500usb_rt2x00debug = {
 };
 #endif /* CONFIG_RT2X00_LIB_DEBUGFS */
 
+#ifdef CONFIG_RT2X00_LIB_RFKILL
+static int rt2500usb_rfkill_poll(struct rt2x00_dev *rt2x00dev)
+{
+        u16 reg;
+
+        rt2500usb_register_read(rt2x00dev, MAC_CSR19, &reg);
+        return rt2x00_get_field32(reg, MAC_CSR19_BIT7);
+}
+#else
+#define rt2500usb_rfkill_poll   NULL
+#endif /* CONFIG_RT2X00_LIB_RFKILL */
+
 #ifdef CONFIG_RT2X00_LIB_LEDS
 static void rt2500usb_brightness_set(struct led_classdev *led_cdev,
                                      enum led_brightness brightness)
@@ -1597,6 +1609,14 @@ static int rt2500usb_init_eeprom(struct rt2x00_dev *rt2x00dev)
 #endif /* CONFIG_RT2X00_LIB_LEDS */
 
         /*
+         * Detect if this device has an hardware controlled radio.
+         */
+#ifdef CONFIG_RT2X00_LIB_RFKILL
+        if (rt2x00_get_field16(eeprom, EEPROM_ANTENNA_HARDWARE_RADIO))
+                __set_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags);
+#endif /* CONFIG_RT2X00_LIB_RFKILL */
+
+        /*
          * Check if the BBP tuning should be disabled.
          */
         rt2x00_eeprom_read(rt2x00dev, EEPROM_NIC, &eeprom);
@@ -1902,6 +1922,7 @@ static const struct rt2x00lib_ops rt2500usb_rt2x00_ops = {
         .uninitialize           = rt2x00usb_uninitialize,
         .clear_entry            = rt2x00usb_clear_entry,
         .set_device_state       = rt2500usb_set_device_state,
+        .rfkill_poll            = rt2500usb_rfkill_poll,
         .link_stats             = rt2500usb_link_stats,
         .reset_tuner            = rt2500usb_reset_tuner,
         .link_tuner             = rt2500usb_link_tuner,
diff --git a/drivers/net/wireless/rt2x00/rt2500usb.h b/drivers/net/wireless/rt2x00/rt2500usb.h
index 4347dfdabcd4..e1f714e82af0 100644
--- a/drivers/net/wireless/rt2x00/rt2500usb.h
+++ b/drivers/net/wireless/rt2x00/rt2500usb.h
@@ -189,6 +189,14 @@
  * MAC_CSR19: GPIO control register.
  */
 #define MAC_CSR19                       0x0426
+#define MAC_CSR19_BIT0                  FIELD32(0x0001)
+#define MAC_CSR19_BIT1                  FIELD32(0x0002)
+#define MAC_CSR19_BIT2                  FIELD32(0x0004)
+#define MAC_CSR19_BIT3                  FIELD32(0x0008)
+#define MAC_CSR19_BIT4                  FIELD32(0x0010)
+#define MAC_CSR19_BIT5                  FIELD32(0x0020)
+#define MAC_CSR19_BIT6                  FIELD32(0x0040)
+#define MAC_CSR19_BIT7                  FIELD32(0x0080)
 
 /*
  * MAC_CSR20: LED control register.
diff --git a/drivers/net/wireless/rt2x00/rt73usb.c b/drivers/net/wireless/rt2x00/rt73usb.c
index e99bcacfc191..c2658108d9c3 100644
--- a/drivers/net/wireless/rt2x00/rt73usb.c
+++ b/drivers/net/wireless/rt2x00/rt73usb.c
@@ -186,6 +186,18 @@ static const struct rt2x00debug rt73usb_rt2x00debug = {
 };
 #endif /* CONFIG_RT2X00_LIB_DEBUGFS */
 
+#ifdef CONFIG_RT2X00_LIB_RFKILL
+static int rt73usb_rfkill_poll(struct rt2x00_dev *rt2x00dev)
+{
+        u32 reg;
+
+        rt2x00usb_register_read(rt2x00dev, MAC_CSR13, &reg);
+        return rt2x00_get_field32(reg, MAC_CSR13_BIT7);
+}
+#else
+#define rt73usb_rfkill_poll     NULL
+#endif /* CONFIG_RT2X00_LIB_RFKILL */
+
 #ifdef CONFIG_RT2X00_LIB_LEDS
 static void rt73usb_brightness_set(struct led_classdev *led_cdev,
                                    enum led_brightness brightness)
@@ -1853,6 +1865,14 @@ static int rt73usb_init_eeprom(struct rt2x00_dev *rt2x00dev)
                 __set_bit(CONFIG_FRAME_TYPE, &rt2x00dev->flags);
 
         /*
+         * Detect if this device has an hardware controlled radio.
+         */
+#ifdef CONFIG_RT2X00_LIB_RFKILL
+        if (rt2x00_get_field16(eeprom, EEPROM_ANTENNA_HARDWARE_RADIO))
+                __set_bit(CONFIG_SUPPORT_HW_BUTTON, &rt2x00dev->flags);
+#endif /* CONFIG_RT2X00_LIB_RFKILL */
+
+        /*
          * Read frequency offset.
          */
         rt2x00_eeprom_read(rt2x00dev, EEPROM_FREQ, &eeprom);
@@ -2257,6 +2277,7 @@ static const struct rt2x00lib_ops rt73usb_rt2x00_ops = {
         .uninitialize           = rt2x00usb_uninitialize,
         .clear_entry            = rt2x00usb_clear_entry,
         .set_device_state       = rt73usb_set_device_state,
+        .rfkill_poll            = rt73usb_rfkill_poll,
         .link_stats             = rt73usb_link_stats,
         .reset_tuner            = rt73usb_reset_tuner,
         .link_tuner             = rt73usb_link_tuner,
diff --git a/drivers/net/wireless/rt2x00/rt73usb.h b/drivers/net/wireless/rt2x00/rt73usb.h
index 46e1405eb0e2..204bbd5b7c59 100644
--- a/drivers/net/wireless/rt2x00/rt73usb.h
+++ b/drivers/net/wireless/rt2x00/rt73usb.h
@@ -267,6 +267,19 @@ struct hw_pairwise_ta_entry {
  * MAC_CSR13: GPIO.
  */
 #define MAC_CSR13                       0x3034
+#define MAC_CSR13_BIT0                  FIELD32(0x00000001)
+#define MAC_CSR13_BIT1                  FIELD32(0x00000002)
+#define MAC_CSR13_BIT2                  FIELD32(0x00000004)
+#define MAC_CSR13_BIT3                  FIELD32(0x00000008)
+#define MAC_CSR13_BIT4                  FIELD32(0x00000010)
+#define MAC_CSR13_BIT5                  FIELD32(0x00000020)
+#define MAC_CSR13_BIT6                  FIELD32(0x00000040)
+#define MAC_CSR13_BIT7                  FIELD32(0x00000080)
+#define MAC_CSR13_BIT8                  FIELD32(0x00000100)
+#define MAC_CSR13_BIT9                  FIELD32(0x00000200)
+#define MAC_CSR13_BIT10                 FIELD32(0x00000400)
+#define MAC_CSR13_BIT11                 FIELD32(0x00000800)
+#define MAC_CSR13_BIT12                 FIELD32(0x00001000)
 
 /*
  * MAC_CSR14: LED control register.