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authorFelix Brack <fb@ltec.ch>2017-04-13 10:51:38 +0300
committerJacek Anaszewski <jacek.anaszewski@gmail.com>2017-04-19 21:27:50 +0300
commit28c5fe99016d28f15d1b825df8acb1558a3a63a1 (patch)
tree634f2d656c14c6f10555249e7957c2202c769613
parentcd3b0b05328e4791c1c5a4edd91599f409bd645f (diff)
downloadlinux-28c5fe99016d28f15d1b825df8acb1558a3a63a1.tar.xz
leds: pca9532: Extend pca9532 device tree support
This patch extends the device tree support for the pca9532 by adding the leds 'default-state' property. Signed-off-by: Felix Brack <fb@ltec.ch> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
-rw-r--r--Documentation/devicetree/bindings/leds/leds-pca9532.txt10
-rw-r--r--drivers/leds/leds-pca9532.c27
-rw-r--r--include/linux/leds-pca9532.h4
3 files changed, 38 insertions, 3 deletions
diff --git a/Documentation/devicetree/bindings/leds/leds-pca9532.txt b/Documentation/devicetree/bindings/leds/leds-pca9532.txt
index 198f3ba0e01f..f769c52e3643 100644
--- a/Documentation/devicetree/bindings/leds/leds-pca9532.txt
+++ b/Documentation/devicetree/bindings/leds/leds-pca9532.txt
@@ -17,6 +17,8 @@ Optional sub-node properties:
- label: see Documentation/devicetree/bindings/leds/common.txt
- type: Output configuration, see dt-bindings/leds/leds-pca9532.h (default NONE)
- linux,default-trigger: see Documentation/devicetree/bindings/leds/common.txt
+ - default-state: see Documentation/devicetree/bindings/leds/common.txt
+ This property is only valid for sub-nodes of type <PCA9532_TYPE_LED>.
Example:
#include <dt-bindings/leds/leds-pca9532.h>
@@ -33,6 +35,14 @@ Example:
label = "pca:green:power";
type = <PCA9532_TYPE_LED>;
};
+ kernel-booting {
+ type = <PCA9532_TYPE_LED>;
+ default-state = "on";
+ };
+ sys-stat {
+ type = <PCA9532_TYPE_LED>;
+ default-state = "keep"; // don't touch, was set by U-Boot
+ };
};
For more product information please see the link below:
diff --git a/drivers/leds/leds-pca9532.c b/drivers/leds/leds-pca9532.c
index 06e63106ae1e..7fea18b0c15d 100644
--- a/drivers/leds/leds-pca9532.c
+++ b/drivers/leds/leds-pca9532.c
@@ -254,6 +254,21 @@ static void pca9532_input_work(struct work_struct *work)
mutex_unlock(&data->update_lock);
}
+static enum pca9532_state pca9532_getled(struct pca9532_led *led)
+{
+ struct i2c_client *client = led->client;
+ struct pca9532_data *data = i2c_get_clientdata(client);
+ u8 maxleds = data->chip_info->num_leds;
+ char reg;
+ enum pca9532_state ret;
+
+ mutex_lock(&data->update_lock);
+ reg = i2c_smbus_read_byte_data(client, LED_REG(maxleds, led->id));
+ ret = reg >> LED_NUM(led->id)/2;
+ mutex_unlock(&data->update_lock);
+ return ret;
+}
+
#ifdef CONFIG_LEDS_PCA9532_GPIO
static int pca9532_gpio_request_pin(struct gpio_chip *gc, unsigned offset)
{
@@ -366,7 +381,10 @@ static int pca9532_configure(struct i2c_client *client,
gpios++;
break;
case PCA9532_TYPE_LED:
- led->state = pled->state;
+ if (pled->state == PCA9532_KEEP)
+ led->state = pca9532_getled(led);
+ else
+ led->state = pled->state;
led->name = pled->name;
led->ldev.name = led->name;
led->ldev.default_trigger = pled->default_trigger;
@@ -456,6 +474,7 @@ pca9532_of_populate_pdata(struct device *dev, struct device_node *np)
const struct of_device_id *match;
int devid, maxleds;
int i = 0;
+ const char *state;
match = of_match_device(of_pca9532_leds_match, dev);
if (!match)
@@ -475,6 +494,12 @@ pca9532_of_populate_pdata(struct device *dev, struct device_node *np)
of_property_read_u32(child, "type", &pdata->leds[i].type);
of_property_read_string(child, "linux,default-trigger",
&pdata->leds[i].default_trigger);
+ if (!of_property_read_string(child, "default-state", &state)) {
+ if (!strcmp(state, "on"))
+ pdata->leds[i].state = PCA9532_ON;
+ else if (!strcmp(state, "keep"))
+ pdata->leds[i].state = PCA9532_KEEP;
+ }
if (++i >= maxleds) {
of_node_put(child);
break;
diff --git a/include/linux/leds-pca9532.h b/include/linux/leds-pca9532.h
index d215b4561180..5e240b2b4d58 100644
--- a/include/linux/leds-pca9532.h
+++ b/include/linux/leds-pca9532.h
@@ -22,7 +22,8 @@ enum pca9532_state {
PCA9532_OFF = 0x0,
PCA9532_ON = 0x1,
PCA9532_PWM0 = 0x2,
- PCA9532_PWM1 = 0x3
+ PCA9532_PWM1 = 0x3,
+ PCA9532_KEEP = 0xff,
};
struct pca9532_led {
@@ -44,4 +45,3 @@ struct pca9532_platform_data {
};
#endif /* __LINUX_PCA9532_H */
-