diff options
Diffstat (limited to 'target/linux/generic/backport-5.10/841-v5.15-leds-pca955x-add-brightness-get-function.patch')
| -rw-r--r-- | target/linux/generic/backport-5.10/841-v5.15-leds-pca955x-add-brightness-get-function.patch | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.10/841-v5.15-leds-pca955x-add-brightness-get-function.patch b/target/linux/generic/backport-5.10/841-v5.15-leds-pca955x-add-brightness-get-function.patch new file mode 100644 index 0000000000..c3344be4fd --- /dev/null +++ b/target/linux/generic/backport-5.10/841-v5.15-leds-pca955x-add-brightness-get-function.patch @@ -0,0 +1,83 @@ +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) |