leds: leds-mc13783: Add devicetree support
This patch adds devicetree support for the MC13XXX LED driver.
(cooloney@gmail.com: remove unneeded semicolon)
Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
diff --git a/drivers/leds/leds-mc13783.c b/drivers/leds/leds-mc13783.c
index 15fa5e8..021adc1 100644
--- a/drivers/leds/leds-mc13783.c
+++ b/drivers/leds/leds-mc13783.c
@@ -20,6 +20,7 @@
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
+#include <linux/of.h>
#include <linux/workqueue.h>
#include <linux/mfd/mc13xxx.h>
@@ -42,7 +43,7 @@
struct mc13xxx *master;
struct mc13xxx_led_devtype *devtype;
int num_leds;
- struct mc13xxx_led led[0];
+ struct mc13xxx_led *led;
};
static unsigned int mc13xxx_max_brightness(int id)
@@ -120,6 +121,74 @@
schedule_work(&led->work);
}
+#ifdef CONFIG_OF
+static struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
+ struct platform_device *pdev)
+{
+ struct mc13xxx_leds *leds = platform_get_drvdata(pdev);
+ struct mc13xxx_leds_platform_data *pdata;
+ struct device_node *parent, *child;
+ struct device *dev = &pdev->dev;
+ int i = 0, ret = -ENODATA;
+
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return ERR_PTR(-ENOMEM);
+
+ of_node_get(dev->parent->of_node);
+
+ parent = of_find_node_by_name(dev->parent->of_node, "leds");
+ if (!parent)
+ goto out_node_put;
+
+ ret = of_property_read_u32_array(parent, "led-control",
+ pdata->led_control,
+ leds->devtype->num_regs);
+ if (ret)
+ goto out_node_put;
+
+ pdata->num_leds = of_get_child_count(parent);
+
+ pdata->led = devm_kzalloc(dev, pdata->num_leds * sizeof(*pdata->led),
+ GFP_KERNEL);
+ if (!pdata->led) {
+ ret = -ENOMEM;
+ goto out_node_put;
+ }
+
+ for_each_child_of_node(parent, child) {
+ const char *str;
+ u32 tmp;
+
+ if (of_property_read_u32(child, "reg", &tmp))
+ continue;
+ pdata->led[i].id = leds->devtype->led_min + tmp;
+
+ if (!of_property_read_string(child, "label", &str))
+ pdata->led[i].name = str;
+ if (!of_property_read_string(child, "linux,default-trigger",
+ &str))
+ pdata->led[i].default_trigger = str;
+
+ i++;
+ }
+
+ pdata->num_leds = i;
+ ret = i > 0 ? 0 : -ENODATA;
+
+out_node_put:
+ of_node_put(parent);
+
+ return ret ? ERR_PTR(ret) : pdata;
+}
+#else
+static inline struct mc13xxx_leds_platform_data __init *mc13xxx_led_probe_dt(
+ struct platform_device *pdev)
+{
+ return ERR_PTR(-ENOSYS);
+}
+#endif
+
static int __init mc13xxx_led_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@@ -128,32 +197,37 @@
struct mc13xxx_led_devtype *devtype =
(struct mc13xxx_led_devtype *)pdev->id_entry->driver_data;
struct mc13xxx_leds *leds;
- int i, id, num_leds, ret = -ENODATA;
+ int i, id, ret = -ENODATA;
u32 init_led = 0;
- if (!pdata) {
- dev_err(dev, "Missing platform data\n");
- return -ENODEV;
- }
-
- num_leds = pdata->num_leds;
-
- if ((num_leds < 1) ||
- (num_leds > (devtype->led_max - devtype->led_min + 1))) {
- dev_err(dev, "Invalid LED count %d\n", num_leds);
- return -EINVAL;
- }
-
- leds = devm_kzalloc(dev, num_leds * sizeof(struct mc13xxx_led) +
- sizeof(struct mc13xxx_leds), GFP_KERNEL);
+ leds = devm_kzalloc(dev, sizeof(*leds), GFP_KERNEL);
if (!leds)
return -ENOMEM;
leds->devtype = devtype;
- leds->num_leds = num_leds;
leds->master = mcdev;
platform_set_drvdata(pdev, leds);
+ if (dev->parent->of_node) {
+ pdata = mc13xxx_led_probe_dt(pdev);
+ if (IS_ERR(pdata))
+ return PTR_ERR(pdata);
+ } else if (!pdata)
+ return -ENODATA;
+
+ leds->num_leds = pdata->num_leds;
+
+ if ((leds->num_leds < 1) ||
+ (leds->num_leds > (devtype->led_max - devtype->led_min + 1))) {
+ dev_err(dev, "Invalid LED count %d\n", leds->num_leds);
+ return -EINVAL;
+ }
+
+ leds->led = devm_kzalloc(dev, leds->num_leds * sizeof(*leds->led),
+ GFP_KERNEL);
+ if (!leds->led)
+ return -ENOMEM;
+
for (i = 0; i < devtype->num_regs; i++) {
ret = mc13xxx_reg_write(mcdev, leds->devtype->ledctrl_base + i,
pdata->led_control[i]);
@@ -161,7 +235,7 @@
return ret;
}
- for (i = 0; i < num_leds; i++) {
+ for (i = 0; i < leds->num_leds; i++) {
const char *name, *trig;
ret = -EINVAL;