add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/leds/leds-mlxreg.c
..
..
@@ -22,6 +22,7 @@
22
22
 #define MLXREG_LED_AMBER_SOLID		0x09 /* Solid amber */
23
23
 #define MLXREG_LED_BLINK_3HZ		167 /* ~167 msec off/on - HW support */
24
24
 #define MLXREG_LED_BLINK_6HZ		83 /* ~83 msec off/on - HW support */
25
+#define MLXREG_LED_CAPABILITY_CLEAR	GENMASK(31, 8) /* Clear mask */
25
26
 
26
27
 /**
27
28
  * struct mlxreg_led_data - led control data:
..
..
@@ -187,6 +188,7 @@
187
188
 	struct mlxreg_led_data *led_data;
188
189
 	struct led_classdev *led_cdev;
189
190
 	enum led_brightness brightness;
191
+	u32 regval;
190
192
 	int i;
191
193
 	int err;
192
194
 
..
..
@@ -196,6 +198,23 @@
196
198
 		if (!led_data)
197
199
 			return -ENOMEM;
198
200
 
201
+		if (data->capability) {
202
+			err = regmap_read(led_pdata->regmap, data->capability,
203
+					  &regval);
204
+			if (err) {
205
+				dev_err(&priv->pdev->dev, "Failed to query capability register\n");
206
+				return err;
207
+			}
208
+			if (!(regval & data->bit))
209
+				continue;
210
+			/*
211
+			 * Field "bit" can contain one capability bit in 0 byte
212
+			 * and offset bit in 1-3 bytes. Clear capability bit and
213
+			 * keep only offset bit.
214
+			 */
215
+			data->bit &= MLXREG_LED_CAPABILITY_CLEAR;
216
+		}
217
+
199
218
 		led_cdev = &led_data->led_cdev;
200
219
 		led_data->data_parent = priv;
201
220
 		if (strstr(data->label, "red") ||