[media] Add device tree support to adp1653 flash driver

Nokia N900 is switching to device tree, make sure we can use flash
there, too.

Signed-off-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

diff --git a/Documentation/devicetree/bindings/media/i2c/adp1653.txt b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
new file mode 100644 (file)
index 0000000..0fc28a9
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
@@ -0,0 +1,37 @@
+* Analog Devices ADP1653 flash LED driver
+
+Required Properties:
+
+  - compatible: Must contain be "adi,adp1653"
+
+  - reg: I2C slave address
+
+  - gpios: References to the GPIO that controls the power for the chip.
+
+There are two led outputs available - flash and indicator. One led is
+represented by one child node, nodes need to be named "flash" and "indicator".
+
+Required properties of the LED child node:
+- max-microamp : see Documentation/devicetree/bindings/leds/common.txt
+
+Required properties of the flash LED child node:
+
+- flash-max-microamp : see Documentation/devicetree/bindings/leds/common.txt
+- flash-timeout-us : see Documentation/devicetree/bindings/leds/common.txt
+
+Example:
+
+       adp1653: led-controller@30 {
+               compatible = "adi,adp1653";
+               reg = <0x30>;
+               gpios = <&gpio3 24 GPIO_ACTIVE_HIGH>; /* 88 */
+
+               flash {
+                       flash-timeout-us = <500000>;
+                       flash-max-microamp = <320000>;
+                       max-microamp = <50000>;
+               };
+               indicator {
+                       max-microamp = <17500>;
+               };
+       };

diff --git a/drivers/media/i2c/adp1653.c b/drivers/media/i2c/adp1653.c
index 873fe19..0341009 100644 (file)
--- a/drivers/media/i2c/adp1653.c
+++ b/drivers/media/i2c/adp1653.c
@@ -8,6 +8,7 @@
  * Contributors:
  *     Sakari Ailus <sakari.ailus@iki.fi>
  *     Tuukka Toivonen <tuukkat76@gmail.com>
+ *     Pavel Machek <pavel@ucw.cz>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
@@ -34,6 +35,8 @@
 #include <linux/module.h>
 #include <linux/i2c.h>
 #include <linux/slab.h>
+#include <linux/of_gpio.h>
+#include <linux/gpio.h>
 #include <media/adp1653.h>
 #include <media/v4l2-device.h>
 
@@ -306,9 +309,17 @@ adp1653_init_device(struct adp1653_flash *flash)
 static int
 __adp1653_set_power(struct adp1653_flash *flash, int on)
 {
-       int ret;
+       int ret = 0;
+
+       if (flash->platform_data->power) {
+               ret = flash->platform_data->power(&flash->subdev, on);
+       } else {
+               gpio_set_value(flash->platform_data->power_gpio, on);
+               if (on)
+                       /* Some delay is apparently required. */
+                       udelay(20);
+       }
 
-       ret = flash->platform_data->power(&flash->subdev, on);
        if (ret < 0)
                return ret;
 
@@ -316,8 +327,13 @@ __adp1653_set_power(struct adp1653_flash *flash, int on)
                return 0;
 
        ret = adp1653_init_device(flash);
-       if (ret < 0)
+       if (ret >= 0)
+               return ret;
+
+       if (flash->platform_data->power)
                flash->platform_data->power(&flash->subdev, 0);
+       else
+               gpio_set_value(flash->platform_data->power_gpio, 0);
 
        return ret;
 }
@@ -407,21 +423,77 @@ static int adp1653_resume(struct device *dev)
 
 #endif /* CONFIG_PM */
 
+static int adp1653_of_init(struct i2c_client *client,
+                          struct adp1653_flash *flash,
+                          struct device_node *node)
+{
+       u32 val;
+       struct adp1653_platform_data *pd;
+       enum of_gpio_flags flags;
+       int gpio;
+       struct device_node *child;
+
+       if (!node)
+               return -EINVAL;
+
+       pd = devm_kzalloc(&client->dev, sizeof(*pd), GFP_KERNEL);
+       if (!pd)
+               return -ENOMEM;
+       flash->platform_data = pd;
+
+       child = of_get_child_by_name(node, "flash");
+       if (!child)
+               return -EINVAL;
+       if (of_property_read_u32(child, "flash-timeout-microsec", &val))
+               return -EINVAL;
+
+       pd->max_flash_timeout = val;
+       if (of_property_read_u32(child, "flash-max-microamp", &val))
+               return -EINVAL;
+       pd->max_flash_intensity = val/1000;
+
+       if (of_property_read_u32(child, "max-microamp", &val))
+               return -EINVAL;
+       pd->max_torch_intensity = val/1000;
+
+       child = of_get_child_by_name(node, "indicator");
+       if (!child)
+               return -EINVAL;
+       if (of_property_read_u32(child, "max-microamp", &val))
+               return -EINVAL;
+       pd->max_indicator_intensity = val;
+
+       if (!of_find_property(node, "gpios", NULL)) {
+               dev_err(&client->dev, "No gpio node\n");
+               return -EINVAL;
+       }
+
+       pd->power_gpio = of_get_gpio_flags(node, 0, &flags);
+       if (pd->power_gpio < 0) {
+               dev_err(&client->dev, "Error getting GPIO\n");
+               return -EINVAL;
+       }
+
+       return 0;
+}
+
+
 static int adp1653_probe(struct i2c_client *client,
                         const struct i2c_device_id *devid)
 {
        struct adp1653_flash *flash;
        int ret;
 
-       /* we couldn't work without platform data */
-       if (client->dev.platform_data == NULL)
-               return -ENODEV;
-
        flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
        if (flash == NULL)
                return -ENOMEM;
 
        flash->platform_data = client->dev.platform_data;
+       if (!flash->platform_data) {
+               ret = adp1653_of_init(client, flash, client->dev.of_node);
+               if (ret)
+                       return ret;
+       }
 
        mutex_init(&flash->power_lock);
 
@@ -438,10 +510,10 @@ static int adp1653_probe(struct i2c_client *client,
                goto free_and_quit;
 
        flash->subdev.entity.type = MEDIA_ENT_T_V4L2_SUBDEV_FLASH;
-
        return 0;
 
 free_and_quit:
+       dev_err(&client->dev, "adp1653: failed to register device\n");
        v4l2_ctrl_handler_free(&flash->ctrls);
        return ret;
 }
@@ -464,7 +536,7 @@ static const struct i2c_device_id adp1653_id_table[] = {
 };
 MODULE_DEVICE_TABLE(i2c, adp1653_id_table);
 
-static struct dev_pm_ops adp1653_pm_ops = {
+static const struct dev_pm_ops adp1653_pm_ops = {
        .suspend        = adp1653_suspend,
        .resume         = adp1653_resume,
 };