/*
 * ST Thermal Sensor Driver for STi series of SoCs
 * Author: Ajit Pal Singh <ajitpal.singh@st.com>
 *
 * Copyright (C) 2003-2014 STMicroelectronics (R&D) Limited
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#ifndef __STI_THERMAL_SYSCFG_H
#define __STI_THERMAL_SYSCFG_H

#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/thermal.h>

enum st_thermal_regfield_ids {
	INT_THRESH_HI = 0, /* Top two regfield IDs are mutually exclusive */
	TEMP_PWR = 0,
	DCORRECT,
	OVERFLOW,
	DATA,
	INT_ENABLE,

	MAX_REGFIELDS
};

/* Thermal sensor power states */
enum st_thermal_power_state {
	POWER_OFF = 0,
	POWER_ON
};

struct st_thermal_sensor;

/**
 * Description of private thermal sensor ops.
 *
 * @power_ctrl:		Function for powering on/off a sensor. Clock to the
 *			sensor is also controlled from this function.
 * @alloc_regfields: 	Allocate regmap register fields, specific to a sensor.
 * @do_memmap_regmap: 	Memory map the thermal register space and init regmap
 *			instance or find regmap instance.
 * @register_irq: 	Register an interrupt handler for a sensor.
 */
struct st_thermal_sensor_ops {
	int (*power_ctrl)(struct st_thermal_sensor *, enum st_thermal_power_state);
	int (*alloc_regfields)(struct st_thermal_sensor *);
	int (*regmap_init)(struct st_thermal_sensor *);
	int (*register_enable_irq)(struct st_thermal_sensor *);
	int (*enable_irq)(struct st_thermal_sensor *);
};

/**
 * Description of thermal driver compatible data.
 *
 * @reg_fields:		Pointer to the regfields array for a sensor.
 * @sys_compat:		Pointer to the syscon node compatible string.
 * @ops: 		Pointer to private thermal ops for a sensor.
 * @calibration_val: 	Default calibration value to be written to the DCORRECT
 *			register field for a sensor.
 * @temp_adjust_val: 	Value to be added/subtracted from the data read from
 *			the sensor. If value needs to be added please provide a
 *			positive value and if it is to be subtracted please
 * 			provide a negative value.
 * @crit_temp: 		The temperature beyond which the SoC should be shutdown
 * 			to prevent damage.
 */
struct st_thermal_compat_data {
	char *sys_compat;
	const struct reg_field *reg_fields;
	const struct st_thermal_sensor_ops *ops;
	unsigned int calibration_val;
	int temp_adjust_val;
	int crit_temp;
};

struct st_thermal_sensor {
	struct device *dev;
	struct thermal_zone_device *thermal_dev;
	const struct st_thermal_sensor_ops *ops;
	const struct st_thermal_compat_data *cdata;
	struct clk *clk;
	struct regmap *regmap;
	struct regmap_field *pwr;
	struct regmap_field *dcorrect;
	struct regmap_field *overflow;
	struct regmap_field *temp_data;
	struct regmap_field *int_thresh_hi;
	struct regmap_field *int_enable;
	int irq;
	void __iomem *mmio_base;
};

extern int st_thermal_register(struct platform_device *pdev,
			       const struct of_device_id *st_thermal_of_match);
extern int st_thermal_unregister(struct platform_device *pdev);
extern const struct dev_pm_ops st_thermal_pm_ops;

#endif /* __STI_RESET_SYSCFG_H */
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