mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-30 10:39:04 +00:00
84 lines
2.3 KiB
Diff
84 lines
2.3 KiB
Diff
|
From 7086625fde6538b2c0623eb767ad23c7ac3d7f3a Mon Sep 17 00:00:00 2001
|
||
|
|
From: Eddie James <eajames@linux.ibm.com>
|
||
|
|
Date: Fri, 16 Jul 2021 17:03:28 -0500
|
||
|
|
Subject: [PATCH] leds: pca955x: Add brightness_get function
|
||
|
|
|
||
|
|
Add a function to fetch the state of the hardware LED.
|
||
|
|
|
||
|
|
Signed-off-by: Eddie James <eajames@linux.ibm.com>
|
||
|
|
Signed-off-by: Pavel Machek <pavel@ucw.cz>
|
||
|
|
---
|
||
|
|
drivers/leds/leds-pca955x.c | 52 +++++++++++++++++++++++++++++++++++++
|
||
|
|
1 file changed, 52 insertions(+)
|
||
|
|
|
||
|
|
diff --git a/drivers/leds/leds-pca955x.c b/drivers/leds/leds-pca955x.c
|
||
|
|
index f0d841cb59fcc8..e47ba7c3b7c7d8 100644
|
||
|
|
--- a/drivers/leds/leds-pca955x.c
|
||
|
|
+++ b/drivers/leds/leds-pca955x.c
|
||
|
|
@@ -233,6 +233,57 @@ static int pca955x_read_ls(struct i2c_client *client, int n, u8 *val)
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
+static int pca955x_read_pwm(struct i2c_client *client, int n, u8 *val)
|
||
|
|
+{
|
||
|
|
+ struct pca955x *pca955x = i2c_get_clientdata(client);
|
||
|
|
+ u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
|
||
|
|
+ int ret;
|
||
|
|
+
|
||
|
|
+ ret = i2c_smbus_read_byte_data(client, cmd);
|
||
|
|
+ if (ret < 0) {
|
||
|
|
+ dev_err(&client->dev, "%s: reg 0x%x, err %d\n",
|
||
|
|
+ __func__, n, ret);
|
||
|
|
+ return ret;
|
||
|
|
+ }
|
||
|
|
+ *val = (u8)ret;
|
||
|
|
+ return 0;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
+static enum led_brightness pca955x_led_get(struct led_classdev *led_cdev)
|
||
|
|
+{
|
||
|
|
+ struct pca955x_led *pca955x_led = container_of(led_cdev,
|
||
|
|
+ struct pca955x_led,
|
||
|
|
+ led_cdev);
|
||
|
|
+ struct pca955x *pca955x = pca955x_led->pca955x;
|
||
|
|
+ u8 ls, pwm;
|
||
|
|
+ int ret;
|
||
|
|
+
|
||
|
|
+ ret = pca955x_read_ls(pca955x->client, pca955x_led->led_num / 4, &ls);
|
||
|
|
+ if (ret)
|
||
|
|
+ return ret;
|
||
|
|
+
|
||
|
|
+ ls = (ls >> ((pca955x_led->led_num % 4) << 1)) & 0x3;
|
||
|
|
+ switch (ls) {
|
||
|
|
+ case PCA955X_LS_LED_ON:
|
||
|
|
+ ret = LED_FULL;
|
||
|
|
+ break;
|
||
|
|
+ case PCA955X_LS_LED_OFF:
|
||
|
|
+ ret = LED_OFF;
|
||
|
|
+ break;
|
||
|
|
+ case PCA955X_LS_BLINK0:
|
||
|
|
+ ret = LED_HALF;
|
||
|
|
+ break;
|
||
|
|
+ case PCA955X_LS_BLINK1:
|
||
|
|
+ ret = pca955x_read_pwm(pca955x->client, 1, &pwm);
|
||
|
|
+ if (ret)
|
||
|
|
+ return ret;
|
||
|
|
+ ret = 255 - pwm;
|
||
|
|
+ break;
|
||
|
|
+ }
|
||
|
|
+
|
||
|
|
+ return ret;
|
||
|
|
+}
|
||
|
|
+
|
||
|
|
static int pca955x_led_set(struct led_classdev *led_cdev,
|
||
|
|
enum led_brightness value)
|
||
|
|
{
|
||
|
|
@@ -512,6 +563,7 @@ static int pca955x_probe(struct i2c_client *client,
|
||
|
|
|
||
|
|
led->name = pca955x_led->name;
|
||
|
|
led->brightness_set_blocking = pca955x_led_set;
|
||
|
|
+ led->brightness_get = pca955x_led_get;
|
||
|
|
|
||
|
|
err = devm_led_classdev_register(&client->dev, led);
|
||
|
|
if (err)
|