wifi: rtl8xxxu: Fix LED control code of RTL8192FU

Some devices, like the Comfast CF-826F, use LED1, which already works.
Others, like Asus USB-N13 C1, use LED0, which doesn't work correctly.

Write the right values to the LED control registers to make LED0 work
as well.

This is unfortunately tested only with the Comfast CF-826F.

Signed-off-by: Bitterblue Smith <[e-mail]>
Reviewed-by: Ping-Ke Shih <[e-mail]>
Signed-off-by: Kalle Valo <[e-mail]>
Link: https://msgid.link/[e-mail]

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_8192f.c

···
 	struct rtl8xxxu_priv *priv = container_of(led_cdev,
 						  struct rtl8xxxu_priv,
 						  led_cdev);
-	u16 ledcfg;
+	u32 ledcfg;
 
 	/* Values obtained by observing the USB traffic from the Windows driver. */
 	rtl8xxxu_write32(priv, REG_SW_GPIO_SHARE_CTRL_0, 0x20080);
 	rtl8xxxu_write32(priv, REG_SW_GPIO_SHARE_CTRL_1, 0x1b0000);
 
-	ledcfg = rtl8xxxu_read16(priv, REG_LEDCFG0);
+	ledcfg = rtl8xxxu_read32(priv, REG_LEDCFG0);
+
+	/* Comfast CF-826F uses LED1. Asus USB-N13 C1 uses LED0. Set both. */
+
+	u32p_replace_bits(&ledcfg, LED_GPIO_ENABLE, LEDCFG0_LED2EN);
+	u32p_replace_bits(&ledcfg, LED_IO_MODE_OUTPUT, LEDCFG0_LED0_IO_MODE);
+	u32p_replace_bits(&ledcfg, LED_IO_MODE_OUTPUT, LEDCFG0_LED1_IO_MODE);
 
 	if (brightness == LED_OFF) {
-		/* Value obtained like above. */
-		ledcfg = BIT(1) | BIT(7);
+		u32p_replace_bits(&ledcfg, LED_MODE_SW_CTRL, LEDCFG0_LED0CM);
+		u32p_replace_bits(&ledcfg, LED_SW_OFF, LEDCFG0_LED0SV);
+		u32p_replace_bits(&ledcfg, LED_MODE_SW_CTRL, LEDCFG0_LED1CM);
+		u32p_replace_bits(&ledcfg, LED_SW_OFF, LEDCFG0_LED1SV);
 	} else if (brightness == LED_ON) {
-		/* Value obtained like above. */
-		ledcfg = BIT(1) | BIT(7) | BIT(11);
+		u32p_replace_bits(&ledcfg, LED_MODE_SW_CTRL, LEDCFG0_LED0CM);
+		u32p_replace_bits(&ledcfg, LED_SW_ON, LEDCFG0_LED0SV);
+		u32p_replace_bits(&ledcfg, LED_MODE_SW_CTRL, LEDCFG0_LED1CM);
+		u32p_replace_bits(&ledcfg, LED_SW_ON, LEDCFG0_LED1SV);
 	} else if (brightness == RTL8XXXU_HW_LED_CONTROL) {
-		/* Value obtained by brute force. */
-		ledcfg = BIT(8) | BIT(9);
+		u32p_replace_bits(&ledcfg, LED_MODE_TX_OR_RX_EVENTS,
+				  LEDCFG0_LED0CM);
+		u32p_replace_bits(&ledcfg, LED_SW_OFF, LEDCFG0_LED0SV);
+		u32p_replace_bits(&ledcfg, LED_MODE_TX_OR_RX_EVENTS,
+				  LEDCFG0_LED1CM);
+		u32p_replace_bits(&ledcfg, LED_SW_OFF, LEDCFG0_LED1SV);
 	}
 
-	rtl8xxxu_write16(priv, REG_LEDCFG0, ledcfg);
+	rtl8xxxu_write32(priv, REG_LEDCFG0, ledcfg);
 
 	return 0;
 }

drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_regs.h

···
 #define  GPIO_INTM_EDGE_TRIG_IRQ	BIT(9)
 
 #define REG_LEDCFG0			0x004c
+#define  LEDCFG0_LED0CM			GENMASK(2, 0)
+#define  LEDCFG0_LED1CM			GENMASK(10, 8)
+#define   LED_MODE_SW_CTRL		0x0
+#define   LED_MODE_TX_OR_RX_EVENTS	0x3
+#define  LEDCFG0_LED0SV			BIT(3)
+#define  LEDCFG0_LED1SV			BIT(11)
+#define   LED_SW_OFF			0x0
+#define   LED_SW_ON			0x1
+#define  LEDCFG0_LED0_IO_MODE		BIT(7)
+#define  LEDCFG0_LED1_IO_MODE		BIT(15)
+#define   LED_IO_MODE_OUTPUT		0x0
+#define   LED_IO_MODE_INPUT		0x1
+#define  LEDCFG0_LED2EN			BIT(21)
+#define   LED_GPIO_DISABLE		0x0
+#define   LED_GPIO_ENABLE		0x1
 #define  LEDCFG0_DPDT_SELECT		BIT(23)
 #define REG_LEDCFG1			0x004d
 #define  LEDCFG1_HW_LED_CONTROL		BIT(1)