/*
   * intel_soc_dts_thermal.c
   * Copyright (c) 2014, Intel Corporation.
   *
   * This program is free software; you can redistribute it and/or modify it
   * under the terms and conditions of the GNU General Public License,
   * version 2, as published by the Free Software Foundation.
   *
   * This program is distributed in the hope 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) KBUILD_MODNAME ": " fmt
  
  #include <linux/module.h>

  #include <linux/interrupt.h>

  #include <asm/cpu_device_id.h>

  #include <asm/intel-family.h>

  #include "intel_soc_dts_iosf.h"

  
  #define CRITICAL_OFFSET_FROM_TJ_MAX	5000

  static int crit_offset = CRITICAL_OFFSET_FROM_TJ_MAX;
  module_param(crit_offset, int, 0644);
  MODULE_PARM_DESC(crit_offset,
  	"Critical Temperature offset from tj max in millidegree Celsius.");

  /* IRQ 86 is a fixed APIC interrupt for BYT DTS Aux threshold notifications */
  #define BYT_SOC_DTS_APIC_IRQ	86

  static int soc_dts_thres_irq;
  static struct intel_soc_dts_sensors *soc_dts;

  
  static irqreturn_t soc_irq_thread_fn(int irq, void *dev_data)
  {

  	pr_debug("proc_thermal_interrupt
  ");

  	intel_soc_dts_iosf_interrupt_handler(soc_dts);

  
  	return IRQ_HANDLED;
  }
  
  static const struct x86_cpu_id soc_thermal_ids[] = {

  	{ X86_VENDOR_INTEL, 6, INTEL_FAM6_ATOM_SILVERMONT1, 0,
  		BYT_SOC_DTS_APIC_IRQ},

  	{}
  };
  MODULE_DEVICE_TABLE(x86cpu, soc_thermal_ids);
  
  static int __init intel_soc_thermal_init(void)
  {

  	int err = 0;

  	const struct x86_cpu_id *match_cpu;
  
  	match_cpu = x86_match_cpu(soc_thermal_ids);
  	if (!match_cpu)
  		return -ENODEV;

  	/* Create a zone with 2 trips with marked as read only */
  	soc_dts = intel_soc_dts_iosf_init(INTEL_SOC_DTS_INTERRUPT_APIC, 2, 1);
  	if (IS_ERR(soc_dts)) {
  		err = PTR_ERR(soc_dts);
  		return err;

  	}

  	soc_dts_thres_irq = (int)match_cpu->driver_data;

  	if (soc_dts_thres_irq) {
  		err = request_threaded_irq(soc_dts_thres_irq, NULL,
  					   soc_irq_thread_fn,
  					   IRQF_TRIGGER_RISING | IRQF_ONESHOT,
  					   "soc_dts", soc_dts);
  		if (err) {

  			/*
  			 * Do not just error out because the user space thermal
  			 * daemon such as DPTF may use polling instead of being
  			 * interrupt driven.
  			 */
  			pr_warn("request_threaded_irq ret %d
  ", err);

  		}

  	}

  	err = intel_soc_dts_iosf_add_read_only_critical_trip(soc_dts,
  							     crit_offset);
  	if (err)
  		goto error_trips;

  
  	return 0;

  error_trips:

  	if (soc_dts_thres_irq)
  		free_irq(soc_dts_thres_irq, soc_dts);

  	intel_soc_dts_iosf_exit(soc_dts);

  
  	return err;
  }
  
  static void __exit intel_soc_thermal_exit(void)
  {

  	if (soc_dts_thres_irq)
  		free_irq(soc_dts_thres_irq, soc_dts);

  	intel_soc_dts_iosf_exit(soc_dts);

  }
  
  module_init(intel_soc_thermal_init)
  module_exit(intel_soc_thermal_exit)
  
  MODULE_DESCRIPTION("Intel SoC DTS Thermal Driver");
  MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
  MODULE_LICENSE("GPL v2");