[PATCHv5] media: i2c/adp1653: devicetree support for adp1653
Pavel Machek
pavel at ucw.cz
Fri Apr 3 01:33:53 PDT 2015
We are moving to device tree support on OMAP3, but that currently
breaks ADP1653 driver. This adds device tree support, plus required
documentation.
Signed-off-by: Pavel Machek <pavel at ucw.cz>
---
Switched to gpiod_, as requested by Javier.
Please apply,
Pavel
diff --git a/Documentation/devicetree/bindings/media/i2c/adp1653.txt b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
new file mode 100644
index 0000000..da9934a
--- /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
+
+ - power-gpios: Reference 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 at 30 {
+ compatible = "adi,adp1653";
+ reg = <0x30>;
+ power-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..ba7f43d 100644
--- a/drivers/media/i2c/adp1653.c
+++ b/drivers/media/i2c/adp1653.c
@@ -8,6 +8,7 @@
* Contributors:
* Sakari Ailus <sakari.ailus at iki.fi>
* Tuukka Toivonen <tuukkat76 at gmail.com>
+ * Pavel Machek <pavel at 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 {
+ gpiod_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
+ gpiod_set_value(flash->platform_data->power_gpio, 0);
return ret;
}
@@ -407,21 +423,75 @@ 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;
+ 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 = devm_gpiod_get(&client->dev, "power");
+ if (!pd->power_gpio) {
+ 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 (client->dev.of_node) {
+ ret = adp1653_of_init(client, flash, client->dev.of_node);
+ if (ret)
+ return ret;
+ }
mutex_init(&flash->power_lock);
@@ -442,6 +512,7 @@ static int adp1653_probe(struct i2c_client *client,
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 +535,7 @@ 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,
};
diff --git a/include/media/adp1653.h b/include/media/adp1653.h
index 1d9b48a..34b505e 100644
--- a/include/media/adp1653.h
+++ b/include/media/adp1653.h
@@ -100,9 +100,11 @@ struct adp1653_platform_data {
int (*power)(struct v4l2_subdev *sd, int on);
u32 max_flash_timeout; /* flash light timeout in us */
- u32 max_flash_intensity; /* led intensity, flash mode */
- u32 max_torch_intensity; /* led intensity, torch mode */
- u32 max_indicator_intensity; /* indicator led intensity */
+ u32 max_flash_intensity; /* led intensity, flash mode, mA */
+ u32 max_torch_intensity; /* led intensity, torch mode, mA */
+ u32 max_indicator_intensity; /* indicator led intensity, uA */
+
+ struct gpio_desc *power_gpio; /* for device-tree based boot */
};
#define to_adp1653_flash(sd) container_of(sd, struct adp1653_flash, subdev)
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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