linux/drivers/pwm/pwm-intel-lgm.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (C) 2020 Intel Corporation.
 *
 * Limitations:
 * - The hardware supports fixed period & configures only 2-wire mode.
 * - Supports normal polarity. Does not support changing polarity.
 * - When PWM is disabled, output of PWM will become 0(inactive). It doesn't
 *   keep track of running period.
 * - When duty cycle is changed, PWM output may be a mix of previous setting
 *   and new setting for the first period. From second period, the output is
 *   based on new setting.
 * - It is a dedicated PWM fan controller. There are no other consumers for
 *   this PWM controller.
 */
#include <linux/bitfield.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/mod_devicetable.h>
#include <linux/pwm.h>
#include <linux/regmap.h>
#include <linux/reset.h>

#define LGM_PWM_FAN_CON0 …
#define LGM_PWM_FAN_EN_EN …
#define LGM_PWM_FAN_EN_DIS …
#define LGM_PWM_FAN_EN_MSK …
#define LGM_PWM_FAN_MODE_2WIRE …
#define LGM_PWM_FAN_MODE_MSK …
#define LGM_PWM_FAN_DC_MSK …

#define LGM_PWM_FAN_CON1 …
#define LGM_PWM_FAN_MAX_RPM_MSK …

#define LGM_PWM_MAX_RPM …
#define LGM_PWM_DEFAULT_RPM …
#define LGM_PWM_MAX_DUTY_CYCLE …

#define LGM_PWM_DC_BITS …

#define LGM_PWM_PERIOD_2WIRE_NS …

struct lgm_pwm_chip { … };

static inline struct lgm_pwm_chip *to_lgm_pwm_chip(struct pwm_chip *chip)
{ … }

static int lgm_pwm_enable(struct pwm_chip *chip, bool enable)
{ … }

static int lgm_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
			 const struct pwm_state *state)
{ … }

static int lgm_pwm_get_state(struct pwm_chip *chip, struct pwm_device *pwm,
			     struct pwm_state *state)
{ … }

static const struct pwm_ops lgm_pwm_ops = …;

static void lgm_pwm_init(struct lgm_pwm_chip *pc)
{ … }

static const struct regmap_config lgm_pwm_regmap_config = …;

static void lgm_clk_release(void *data)
{ … }

static int lgm_clk_enable(struct device *dev, struct clk *clk)
{ … }

static void lgm_reset_control_release(void *data)
{ … }

static int lgm_reset_control_deassert(struct device *dev, struct reset_control *rst)
{ … }

static int lgm_pwm_probe(struct platform_device *pdev)
{ … }

static const struct of_device_id lgm_pwm_of_match[] = …;
MODULE_DEVICE_TABLE(of, lgm_pwm_of_match);

static struct platform_driver lgm_pwm_driver = …;
module_platform_driver(…) …;

MODULE_DESCRIPTION(…) …;
MODULE_LICENSE(…) …;