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@xxxxxx>
---
Changed -microsec to -us, as requested by devicetree people.
Fixed checkpatch issues.
diff --git a/Documentation/devicetree/bindings/leds/common.txt b/Documentation/devicetree/bindings/leds/common.txt
index 2d88816..2c6c7c5 100644
--- a/Documentation/devicetree/bindings/leds/common.txt
+++ b/Documentation/devicetree/bindings/leds/common.txt
@@ -14,6 +14,15 @@ Optional properties for child nodes:
"ide-disk" - LED indicates disk activity
"timer" - LED flashes at a fixed, configurable rate
+- max-microamp : maximum intensity in microamperes of the LED
+ (torch LED for flash devices)
+- flash-max-microamp : maximum intensity in microamperes of the
+ flash LED; it is mandatory if the LED should
+ support the flash mode
+- flash-timeout-microsec : timeout in microseconds after which the flash
+ LED is turned off
+
+
Examples:
system-status {
@@ -21,3 +30,10 @@ system-status {
linux,default-trigger = "heartbeat";
...
};
+
+camera-flash {
+ label = "Flash";
+ max-microamp = <50000>;
+ flash-max-microamp = <320000>;
+ flash-timeout-microsec = <500000>;
+}
diff --git a/Documentation/devicetree/bindings/media/i2c/adp1653.txt b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
new file mode 100644
index 0000000..3c7065f
--- /dev/null
+++ b/Documentation/devicetree/bindings/media/i2c/adp1653.txt
@@ -0,0 +1,38 @@
+* Analog Devices ADP1653 flash LED driver
+
+Required Properties:
+
+ - compatible: Must contain one of the following
+ - "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/arch/arm/boot/dts/omap3-n900.dts b/arch/arm/boot/dts/omap3-n900.dts
index bc82a12..d04e7cc 100644
--- a/arch/arm/boot/dts/omap3-n900.dts
+++ b/arch/arm/boot/dts/omap3-n900.dts
@@ -553,6 +558,22 @@
ti,usb-charger-detection = <&isp1704>;
};
+
+ 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>;
+ };
+ };
};
&i2c3 {
diff --git a/drivers/media/i2c/adp1653.c b/drivers/media/i2c/adp1653.c
index 873fe19..78341d0 100644
--- a/drivers/media/i2c/adp1653.c
+++ b/drivers/media/i2c/adp1653.c
@@ -8,6 +8,7 @@
* Contributors:
* Sakari Ailus <sakari.ailus@xxxxxx>
* Tuukka Toivonen <tuukkat76@xxxxxxxxx>
+ * Pavel Machek <pavel@xxxxxx>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
@@ -34,9 +35,12 @@
#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/slab.h>
+#include <linux/of_gpio.h>
#include <media/adp1653.h>
#include <media/v4l2-device.h>
+#include <linux/gpio.h>
+
#define TIMEOUT_MAX 820000
#define TIMEOUT_STEP 54600
#define TIMEOUT_MIN (TIMEOUT_MAX - ADP1653_REG_CONFIG_TMR_SET_MAX \
@@ -306,9 +318,18 @@ 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 +337,13 @@ __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 +433,78 @@ 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;
+ }
+
+ gpio = of_get_gpio_flags(node, 0, &flags);
+ if (gpio < 0) {
+ dev_err(&client->dev, "Error getting GPIO\n");
+ return -EINVAL;
+ }
+
+ pd->power_gpio = gpio;
+ 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 +521,11 @@ 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 +551,7 @@ 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,
};
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
--
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