linux/drivers/pwm/pwm-lpss-platform.c
Thomas Gleixner d2912cb15b treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
Based on 2 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation #

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 4122 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Enrico Weigelt <info@metux.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-19 17:09:55 +02:00

118 lines
2.9 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/acpi.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include "pwm-lpss.h"
/* BayTrail */
static const struct pwm_lpss_boardinfo pwm_lpss_byt_info = {
.clk_rate = 25000000,
.npwm = 1,
.base_unit_bits = 16,
};
/* Braswell */
static const struct pwm_lpss_boardinfo pwm_lpss_bsw_info = {
.clk_rate = 19200000,
.npwm = 1,
.base_unit_bits = 16,
.other_devices_aml_touches_pwm_regs = true,
};
/* Broxton */
static const struct pwm_lpss_boardinfo pwm_lpss_bxt_info = {
.clk_rate = 19200000,
.npwm = 4,
.base_unit_bits = 22,
.bypass = true,
};
static int pwm_lpss_probe_platform(struct platform_device *pdev)
{
const struct pwm_lpss_boardinfo *info;
const struct acpi_device_id *id;
struct pwm_lpss_chip *lpwm;
struct resource *r;
id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
if (!id)
return -ENODEV;
info = (const struct pwm_lpss_boardinfo *)id->driver_data;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
lpwm = pwm_lpss_probe(&pdev->dev, r, info);
if (IS_ERR(lpwm))
return PTR_ERR(lpwm);
platform_set_drvdata(pdev, lpwm);
dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_SMART_PREPARE);
pm_runtime_set_active(&pdev->dev);
pm_runtime_enable(&pdev->dev);
return 0;
}
static int pwm_lpss_remove_platform(struct platform_device *pdev)
{
struct pwm_lpss_chip *lpwm = platform_get_drvdata(pdev);
pm_runtime_disable(&pdev->dev);
return pwm_lpss_remove(lpwm);
}
static int pwm_lpss_prepare(struct device *dev)
{
struct pwm_lpss_chip *lpwm = dev_get_drvdata(dev);
/*
* If other device's AML code touches the PWM regs on suspend/resume
* force runtime-resume the PWM controller to allow this.
*/
if (lpwm->info->other_devices_aml_touches_pwm_regs)
return 0; /* Force runtime-resume */
return 1; /* If runtime-suspended leave as is */
}
static const struct dev_pm_ops pwm_lpss_platform_pm_ops = {
.prepare = pwm_lpss_prepare,
SET_SYSTEM_SLEEP_PM_OPS(pwm_lpss_suspend, pwm_lpss_resume)
};
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,
.pm = &pwm_lpss_platform_pm_ops,
},
.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_ALIAS("platform:pwm-lpss");