/* Copyright (c) 2010, 2011, 2016 The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/leds.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/regmap.h>
#define PM8058_LED_TYPE_COMMON 0x00
#define PM8058_LED_TYPE_KEYPAD 0x01
#define PM8058_LED_TYPE_FLASH 0x02
#define PM8058_LED_TYPE_COMMON_MASK 0xf8
#define PM8058_LED_TYPE_KEYPAD_MASK 0xf0
#define PM8058_LED_TYPE_COMMON_SHIFT 3
#define PM8058_LED_TYPE_KEYPAD_SHIFT 4
struct pm8058_led {
struct regmap *map;
u32 reg;
u32 ledtype;
struct led_classdev cdev;
};
static void pm8058_led_set(struct led_classdev *cled,
enum led_brightness value)
{
struct pm8058_led *led;
int ret = 0;
unsigned int mask = 0;
unsigned int val = 0;
led = container_of(cled, struct pm8058_led, cdev);
switch (led->ledtype) {
case PM8058_LED_TYPE_COMMON:
mask = PM8058_LED_TYPE_COMMON_MASK;
val = value << PM8058_LED_TYPE_COMMON_SHIFT;
break;
case PM8058_LED_TYPE_KEYPAD:
case PM8058_LED_TYPE_FLASH:
mask = PM8058_LED_TYPE_KEYPAD_MASK;
val = value << PM8058_LED_TYPE_KEYPAD_SHIFT;
break;
default:
break;
}
ret = regmap_update_bits(led->map, led->reg, mask, val);
if (ret)
pr_err("Failed to set LED brightness\n");
}
static enum led_brightness pm8058_led_get(struct led_classdev *cled)
{
struct pm8058_led *led;
int ret;
unsigned int val;
led = container_of(cled, struct pm8058_led, cdev);
ret = regmap_read(led->map, led->reg, &val);
if (ret) {
pr_err("Failed to get LED brightness\n");
return LED_OFF;
}
switch (led->ledtype) {
case PM8058_LED_TYPE_COMMON:
val &= PM8058_LED_TYPE_COMMON_MASK;
val >>= PM8058_LED_TYPE_COMMON_SHIFT;
break;
case PM8058_LED_TYPE_KEYPAD:
case PM8058_LED_TYPE_FLASH:
val &= PM8058_LED_TYPE_KEYPAD_MASK;
val >>= PM8058_LED_TYPE_KEYPAD_SHIFT;
break;
default:
val = LED_OFF;
break;
}
return val;
}
static int pm8058_led_probe(struct platform_device *pdev)
{
struct pm8058_led *led;
struct device_node *np = pdev->dev.of_node;
int ret;
struct regmap *map;
const char *state;
enum led_brightness maxbright;
led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
if (!led)
return -ENOMEM;
led->ledtype = (u32)of_device_get_match_data(&pdev->dev);
map = dev_get_regmap(pdev->dev.parent, NULL);
if (!map) {
dev_err(&pdev->dev, "Parent regmap unavailable.\n");
return -ENXIO;
}
led->map = map;
ret = of_property_read_u32(np, "reg", &led->reg);
if (ret) {
dev_err(&pdev->dev, "no register offset specified\n");
return -EINVAL;
}
/* Use label else node name */
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 = pm8058_led_set;
led->cdev.brightness_get = pm8058_led_get;
if (led->ledtype == PM8058_LED_TYPE_COMMON)
maxbright = 31; /* 5 bits */
else
maxbright = 15; /* 4 bits */
led->cdev.max_brightness = maxbright;
state = of_get_property(np, "default-state", NULL);
if (state) {
if (!strcmp(state, "keep")) {
led->cdev.brightness = pm8058_led_get(&led->cdev);
} else if (!strcmp(state, "on")) {
led->cdev.brightness = maxbright;
pm8058_led_set(&led->cdev, maxbright);
} else {
led->cdev.brightness = LED_OFF;
pm8058_led_set(&led->cdev, LED_OFF);
}
}
if (led->ledtype == PM8058_LED_TYPE_KEYPAD ||
led->ledtype == PM8058_LED_TYPE_FLASH)
led->cdev.flags = LED_CORE_SUSPENDRESUME;
ret = devm_led_classdev_register(&pdev->dev, &led->cdev);
if (ret) {
dev_err(&pdev->dev, "unable to register led \"%s\"\n",
led->cdev.name);
return ret;
}
return 0;
}
static const struct of_device_id pm8058_leds_id_table[] = {
{
.compatible = "qcom,pm8058-led",
.data = (void *)PM8058_LED_TYPE_COMMON
},
{
.compatible = "qcom,pm8058-keypad-led",
.data = (void *)PM8058_LED_TYPE_KEYPAD
},
{
.compatible = "qcom,pm8058-flash-led",
.data = (void *)PM8058_LED_TYPE_FLASH
},
{ },
};
MODULE_DEVICE_TABLE(of, pm8058_leds_id_table);
static struct platform_driver pm8058_led_driver = {
.probe = pm8058_led_probe,
.driver = {
.name = "pm8058-leds",
.of_match_table = pm8058_leds_id_table,
},
};
module_platform_driver(pm8058_led_driver);
MODULE_DESCRIPTION("PM8058 LEDs driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:pm8058-leds");
