leds-lp55xx: support device specific attributes

 To support device specific attributes, new common driver function is added.
 Eventually those are created on registering the sysfs with common dev attrs.
 Furthermore, this patch makes adding device attributes simple in each driver.

Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

diff --git a/drivers/leds/leds-lp55xx-common.c b/drivers/leds/leds-lp55xx-common.c
index 578902ab604f999735e87ddeb8b4cc52bc40cdde..9638ad4dc635dddce4e67806e3d32b0524fcf10a 100644 (file)
--- a/drivers/leds/leds-lp55xx-common.c
+++ b/drivers/leds/leds-lp55xx-common.c
@@ -493,8 +493,19 @@ EXPORT_SYMBOL_GPL(lp55xx_unregister_leds);
 int lp55xx_register_sysfs(struct lp55xx_chip *chip)
 {
        struct device *dev = &chip->cl->dev;
+       struct lp55xx_device_config *cfg = chip->cfg;
+       int ret;
+
+       if (!cfg->run_engine || !cfg->firmware_cb)
+               goto dev_specific_attrs;
+
+       ret = sysfs_create_group(&dev->kobj, &lp55xx_engine_attr_group);
+       if (ret)
+               return ret;
 
-       return sysfs_create_group(&dev->kobj, &lp55xx_engine_attr_group);
+dev_specific_attrs:
+       return cfg->dev_attr_group ?
+               sysfs_create_group(&dev->kobj, cfg->dev_attr_group) : 0;
 }
 EXPORT_SYMBOL_GPL(lp55xx_register_sysfs);
 

diff --git a/drivers/leds/leds-lp55xx-common.h b/drivers/leds/leds-lp55xx-common.h
index 8473abf9830cddca63ce0fb69ee92b8f094e395c..64eb78da1c4be6e161f21ef8243403b6fded4933 100644 (file)
--- a/drivers/leds/leds-lp55xx-common.h
+++ b/drivers/leds/leds-lp55xx-common.h
@@ -45,6 +45,7 @@ struct lp55xx_reg {
  * @set_led_current    : LED current set function
  * @firmware_cb        : Call function when the firmware is loaded
  * @run_engine         : Run internal engine for pattern
+ * @dev_attr_group     : Device specific attributes
  */
 struct lp55xx_device_config {
        const struct lp55xx_reg reset;
@@ -65,6 +66,9 @@ struct lp55xx_device_config {
 
        /* used for running firmware LED patterns */
        void (*run_engine) (struct lp55xx_chip *chip, bool start);
+
+       /* additional device specific attributes */
+       const struct attribute_group *dev_attr_group;
 };
 
 /*