// 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,

  };

  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");