leds/tca6507: Add support for devicetree.

Support added only for leds (not for gpio's).

(cooloney@gmail.com: fix 2 building errors)

Signed-off-by: Marek Belisko <marek.belisko@open-nandra.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>

diff --git a/drivers/leds/leds-tca6507.c b/drivers/leds/leds-tca6507.c
index b26a63b..220fc7f 100644 (file)
--- a/drivers/leds/leds-tca6507.c
+++ b/drivers/leds/leds-tca6507.c
@@ -667,8 +667,72 @@ static void tca6507_remove_gpio(struct tca6507_chip *tca)
 }
 #endif /* CONFIG_GPIOLIB */
 
+#ifdef CONFIG_OF
+static struct tca6507_platform_data *
+tca6507_led_dt_init(struct i2c_client *client)
+{
+       struct device_node *np = client->dev.of_node, *child;
+       struct tca6507_platform_data *pdata;
+       struct led_info *tca_leds;
+       int count = 0;
+
+       for_each_child_of_node(np, child)
+               count++;
+       if (!count)
+               return ERR_PTR(-ENODEV);
+
+       if (count > NUM_LEDS)
+               return ERR_PTR(-ENODEV);
+
+       tca_leds = devm_kzalloc(&client->dev,
+                       sizeof(struct led_info) * count, GFP_KERNEL);
+       if (!tca_leds)
+               return ERR_PTR(-ENOMEM);
+
+       for_each_child_of_node(np, child) {
+               struct led_info led;
+               u32 reg;
+               int ret;
+
+               led.name =
+                       of_get_property(child, "label", NULL) ? : child->name;
+               led.default_trigger =
+                       of_get_property(child, "linux,default-trigger", NULL);
+
+               ret = of_property_read_u32(child, "reg", &reg);
+               if (ret != 0)
+                       continue;
+
+               tca_leds[reg] = led;
+       }
+       pdata = devm_kzalloc(&client->dev,
+                       sizeof(struct tca6507_platform_data), GFP_KERNEL);
+       if (!pdata)
+               return ERR_PTR(-ENOMEM);
+
+       pdata->leds.leds = tca_leds;
+       pdata->leds.num_leds = count;
+
+       return pdata;
+}
+
+static const struct of_device_id of_tca6507_leds_match[] = {
+       { .compatible = "ti,tca6507", },
+       {},
+};
+
+#else
+static struct tca6507_platform_data *
+tca6507_led_dt_init(struct i2c_client *client)
+{
+       return ERR_PTR(-ENODEV);
+}
+
+#define of_tca6507_leds_match NULL
+#endif
+
 static int tca6507_probe(struct i2c_client *client,
-                                  const struct i2c_device_id *id)
+               const struct i2c_device_id *id)
 {
        struct tca6507_chip *tca;
        struct i2c_adapter *adapter;
@@ -683,9 +747,12 @@ static int tca6507_probe(struct i2c_client *client,
                return -EIO;
 
        if (!pdata || pdata->leds.num_leds != NUM_LEDS) {
-               dev_err(&client->dev, "Need %d entries in platform-data list\n",
-                       NUM_LEDS);
-               return -ENODEV;
+               pdata = tca6507_led_dt_init(client);
+               if (IS_ERR(pdata)) {
+                       dev_err(&client->dev, "Need %d entries in platform-data list\n",
+                               NUM_LEDS);
+                       return PTR_ERR(pdata);
+               }
        }
        tca = devm_kzalloc(&client->dev, sizeof(*tca), GFP_KERNEL);
        if (!tca)
@@ -750,6 +817,7 @@ static struct i2c_driver tca6507_driver = {
        .driver   = {
                .name    = "leds-tca6507",
                .owner   = THIS_MODULE,
+               .of_match_table = of_tca6507_leds_match,
        },
        .probe    = tca6507_probe,
        .remove   = tca6507_remove,