mirror of
https://github.com/torvalds/linux.git
synced 2024-11-25 13:41:51 +00:00
f0f31de356
The pwm_lpss_probe() uses managed resources. Show this to the users explicitly by adding devm prefix to its name. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Intel Low Power Subsystem PWM controller driver
|
|
*
|
|
* Copyright (C) 2014, Intel Corporation
|
|
*
|
|
* Derived from the original pwm-lpss.c
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/module.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/pm_runtime.h>
|
|
#include <linux/property.h>
|
|
|
|
#include "pwm-lpss.h"
|
|
|
|
|
|
static int pwm_lpss_probe_platform(struct platform_device *pdev)
|
|
{
|
|
const struct pwm_lpss_boardinfo *info;
|
|
struct pwm_lpss_chip *lpwm;
|
|
void __iomem *base;
|
|
|
|
info = device_get_match_data(&pdev->dev);
|
|
if (!info)
|
|
return -ENODEV;
|
|
|
|
base = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(base))
|
|
return PTR_ERR(base);
|
|
|
|
lpwm = devm_pwm_lpss_probe(&pdev->dev, base, info);
|
|
if (IS_ERR(lpwm))
|
|
return PTR_ERR(lpwm);
|
|
|
|
platform_set_drvdata(pdev, lpwm);
|
|
|
|
/*
|
|
* On Cherry Trail devices the GFX0._PS0 AML checks if the controller
|
|
* is on and if it is not on it turns it on and restores what it
|
|
* believes is the correct state to the PWM controller.
|
|
* Because of this we must disallow direct-complete, which keeps the
|
|
* controller (runtime)suspended on resume, to avoid 2 issues:
|
|
* 1. The controller getting turned on without the linux-pm code
|
|
* knowing about this. On devices where the controller is unused
|
|
* this causes it to stay on during the next suspend causing high
|
|
* battery drain (because S0i3 is not reached)
|
|
* 2. The state restoring code unexpectedly messing with the controller
|
|
*
|
|
* Leaving the controller runtime-suspended (skipping runtime-resume +
|
|
* normal-suspend) during suspend is fine.
|
|
*/
|
|
if (info->other_devices_aml_touches_pwm_regs)
|
|
dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NO_DIRECT_COMPLETE|
|
|
DPM_FLAG_SMART_SUSPEND);
|
|
|
|
pm_runtime_set_active(&pdev->dev);
|
|
pm_runtime_enable(&pdev->dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pwm_lpss_remove_platform(struct platform_device *pdev)
|
|
{
|
|
pm_runtime_disable(&pdev->dev);
|
|
return 0;
|
|
}
|
|
|
|
static const struct acpi_device_id pwm_lpss_acpi_match[] = {
|
|
{ "80860F09", (unsigned long)&pwm_lpss_byt_info },
|
|
{ "80862288", (unsigned long)&pwm_lpss_bsw_info },
|
|
{ "80862289", (unsigned long)&pwm_lpss_bsw_info },
|
|
{ "80865AC8", (unsigned long)&pwm_lpss_bxt_info },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(acpi, pwm_lpss_acpi_match);
|
|
|
|
static struct platform_driver pwm_lpss_driver_platform = {
|
|
.driver = {
|
|
.name = "pwm-lpss",
|
|
.acpi_match_table = pwm_lpss_acpi_match,
|
|
},
|
|
.probe = pwm_lpss_probe_platform,
|
|
.remove = pwm_lpss_remove_platform,
|
|
};
|
|
module_platform_driver(pwm_lpss_driver_platform);
|
|
|
|
MODULE_DESCRIPTION("PWM platform driver for Intel LPSS");
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_IMPORT_NS(PWM_LPSS);
|
|
MODULE_ALIAS("platform:pwm-lpss");
|