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/* Copyright (c) 2011, 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.
*/
#define pr_fmt(fmt) "%s: " fmt, __func__
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/leds.h>
#include <linux/io.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
#include <linux/module.h>
#ifdef CONFIG_HAS_EARLYSUSPEND
#include <linux/earlysuspend.h>
/* Early-suspend level */
#define LED_SUSPEND_LEVEL 1
#endif
#define PDM_DUTY_MAXVAL BIT(16)
#define PDM_DUTY_REFVAL BIT(15)
struct pdm_led_data {
struct led_classdev cdev;
void __iomem *perph_base;
int pdm_offset;
#ifdef CONFIG_HAS_EARLYSUSPEND
struct early_suspend early_suspend;
#endif
};
static void msm_led_brightness_set_percent(struct pdm_led_data *led,
int duty_per)
{
u16 duty_val;
duty_val = PDM_DUTY_REFVAL - ((PDM_DUTY_MAXVAL * duty_per) / 100);
if (!duty_per)
duty_val--;
writel_relaxed(duty_val, led->perph_base + led->pdm_offset);
}
static void msm_led_brightness_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct pdm_led_data *led =
container_of(led_cdev, struct pdm_led_data, cdev);
msm_led_brightness_set_percent(led, (value * 100) / LED_FULL);
}
#ifdef CONFIG_PM_SLEEP
static int msm_led_pdm_suspend(struct device *dev)
{
struct pdm_led_data *led = dev_get_drvdata(dev);
msm_led_brightness_set_percent(led, 0);
return 0;
}
#ifdef CONFIG_HAS_EARLYSUSPEND
static void msm_led_pdm_early_suspend(struct early_suspend *h)
{
struct pdm_led_data *led = container_of(h,
struct pdm_led_data, early_suspend);
msm_led_pdm_suspend(led->cdev.dev->parent);
}
#endif
static const struct dev_pm_ops msm_led_pdm_pm_ops = {
#ifndef CONFIG_HAS_EARLYSUSPEND
.suspend = msm_led_pdm_suspend,
#endif
};
#endif
static int msm_pdm_led_probe(struct platform_device *pdev)
{
const struct led_info *pdata = pdev->dev.platform_data;
struct pdm_led_data *led;
struct resource *res, *ioregion;
u32 tcxo_pdm_ctl;
int rc;
if (!pdata) {
pr_err("platform data is invalid\n");
return -EINVAL;
}
if (pdev->id > 2) {
pr_err("pdm id is invalid\n");
return -EINVAL;
}
led = kzalloc(sizeof(struct pdm_led_data), GFP_KERNEL);
if (!led)
return -ENOMEM;
/* Enable runtime PM ops, start in ACTIVE mode */
rc = pm_runtime_set_active(&pdev->dev);
if (rc < 0)
dev_dbg(&pdev->dev, "unable to set runtime pm state\n");
pm_runtime_enable(&pdev->dev);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
pr_err("get resource failed\n");
rc = -EINVAL;
goto err_get_res;
}
ioregion = request_mem_region(res->start, resource_size(res),
pdev->name);
if (!ioregion) {
pr_err("request for mem region failed\n");
rc = -ENOMEM;
goto err_get_res;
}
led->perph_base = ioremap(res->start, resource_size(res));
if (!led->perph_base) {
pr_err("ioremap failed\n");
rc = -ENOMEM;
goto err_ioremap;
}
/* Pulse Density Modulation(PDM) ids start with 0 and
* every PDM register takes 4 bytes
*/
led->pdm_offset = ((pdev->id) + 1) * 4;
/* program tcxo_pdm_ctl register to enable pdm*/
tcxo_pdm_ctl = readl_relaxed(led->perph_base);
tcxo_pdm_ctl |= (1 << pdev->id);
writel_relaxed(tcxo_pdm_ctl, led->perph_base);
/* Start with LED in off state */
msm_led_brightness_set_percent(led, 0);
led->cdev.brightness_set = msm_led_brightness_set;
led->cdev.name = pdata->name ? : "leds-msm-pdm";
rc = led_classdev_register(&pdev->dev, &led->cdev);
if (rc) {
pr_err("led class registration failed\n");
goto err_led_reg;
}
#ifdef CONFIG_HAS_EARLYSUSPEND
led->early_suspend.level = EARLY_SUSPEND_LEVEL_BLANK_SCREEN +
LED_SUSPEND_LEVEL;
led->early_suspend.suspend = msm_led_pdm_early_suspend;
register_early_suspend(&led->early_suspend);
#endif
platform_set_drvdata(pdev, led);
return 0;
err_led_reg:
iounmap(led->perph_base);
err_ioremap:
release_mem_region(res->start, resource_size(res));
err_get_res:
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_disable(&pdev->dev);
kfree(led);
return rc;
}
static int msm_pdm_led_remove(struct platform_device *pdev)
{
struct pdm_led_data *led = platform_get_drvdata(pdev);
struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
#ifdef CONFIG_HAS_EARLYSUSPEND
unregister_early_suspend(&led->early_suspend);
#endif
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_disable(&pdev->dev);
led_classdev_unregister(&led->cdev);
msm_led_brightness_set_percent(led, 0);
iounmap(led->perph_base);
release_mem_region(res->start, resource_size(res));
kfree(led);
return 0;
}
static struct platform_driver msm_pdm_led_driver = {
.probe = msm_pdm_led_probe,
.remove = msm_pdm_led_remove,
.driver = {
.name = "leds-msm-pdm",
.owner = THIS_MODULE,
#ifdef CONFIG_PM_SLEEP
.pm = &msm_led_pdm_pm_ops,
#endif
},
};
static int __init msm_pdm_led_init(void)
{
return platform_driver_register(&msm_pdm_led_driver);
}
module_init(msm_pdm_led_init);
static void __exit msm_pdm_led_exit(void)
{
platform_driver_unregister(&msm_pdm_led_driver);
}
module_exit(msm_pdm_led_exit);
MODULE_DESCRIPTION("MSM PDM LEDs driver");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:leds-msm-pdm");
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