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#include <linux/device.h>
#include <linux/module.h>
#include <linux/of_platform.h>
#include <linux/regmap.h>
#include <linux/leds.h>
#define LED_REG_VALUE 0x0
#define LED_REG_PERIOD 0x1
#define LED_BLINK_MIN_MS 20
#define LED_BLINK_MAX_MS 5100
#define MS_TO_CDS9K(x) ((x) / 10)
#define CDS9K_TO_MS(x) ((x) * 10)
struct cds9k_led {
struct led_classdev cdev;
struct regmap *regmap;
struct device *dev;
u32 base;
};
int cds9k_led_blink_set(struct led_classdev *led_cdev,
unsigned long *delay_on,
unsigned long *delay_off)
{
struct cds9k_led *led = container_of(led_cdev, struct cds9k_led, cdev);
unsigned long blink_value;
/* Only 50% duty is supported by controller, so we ignore delay_off */
blink_value = MS_TO_CDS9K(*delay_on);
if (blink_value > 255) {
blink_value = 255;
}
*delay_off = *delay_on = CDS9K_TO_MS(blink_value);
return regmap_write(led->regmap, led->base + LED_REG_PERIOD, blink_value);
}
void cds9k_led_brightness_set(struct led_classdev *led_cdev,
enum led_brightness brightness)
{
unsigned long blink_off = 0;
struct cds9k_led *led = container_of(led_cdev, struct cds9k_led, cdev);
regmap_write(led->regmap, led->base + LED_REG_VALUE, brightness);
if (brightness == LED_OFF)
cds9k_led_blink_set(led_cdev, &blink_off, &blink_off);
}
enum led_brightness cds9k_led_brightness_get(struct led_classdev *led_cdev)
{
int ret;
unsigned int brightness;
struct cds9k_led *led = container_of(led_cdev, struct cds9k_led, cdev);
ret = regmap_read(led->regmap, led->base + LED_REG_VALUE, &brightness);
if (ret) {
dev_err(led->dev, "Failed to read LED brightness");
return LED_OFF;
}
if (brightness > LED_FULL)
brightness = LED_FULL;
return brightness;
}
static int cds9k_led_probe(struct platform_device *pdev)
{
int ret;
struct cds9k_led *led;
struct device_node *np = pdev->dev.of_node;
struct led_init_data init_data = {};
led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
if (!led)
return -ENOMEM;
ret = device_property_read_u32(&pdev->dev, "reg", &led->base);
if (ret)
return -EINVAL;
if (!pdev->dev.parent)
return -ENODEV;
led->regmap = dev_get_regmap(pdev->dev.parent, NULL);
if (!led->regmap)
return -ENODEV;
led->dev = &pdev->dev;
led->cdev.name = of_get_property(np, "label", NULL) ? : np->name;
led->cdev.default_trigger = of_get_property(np, "linux,default-trigger", NULL);
led->cdev.brightness_set = cds9k_led_brightness_set;
led->cdev.brightness_get = cds9k_led_brightness_get;
led->cdev.max_brightness = 0xFF;
led->cdev.blink_set = cds9k_led_blink_set;
/* FIXME default state keep/on etc */
init_data.fwnode = of_fwnode_handle(np);
init_data.devicename = "cds9k_led";
return devm_led_classdev_register_ext(&pdev->dev, &led->cdev, &init_data);
}
static struct of_device_id cds9k_led_of_match[] = {
{ .compatible = "david,cds9k-led" },
{}
};
MODULE_DEVICE_TABLE(of, cds9k_led_of_match);
static struct platform_driver cds9k_led = {
.driver = {
.name = "cds9k-led",
.of_match_table = cds9k_led_of_match,
},
.probe = cds9k_led_probe,
};
module_platform_driver(cds9k_led);
MODULE_AUTHOR("David Phillips <david@yeah.nah.nz>");
MODULE_DESCRIPTION("LED driver for the CDS9K board controller");
MODULE_LICENSE("GPL v2");
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