linux/drivers/pwm/pwm-cros-ec.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Expose a PWM controlled by the ChromeOS EC to the host processor.
 *
 * Copyright (C) 2016 Google, Inc.
 */

#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_data/cros_ec_commands.h>
#include <linux/platform_data/cros_ec_proto.h>
#include <linux/platform_device.h>
#include <linux/pwm.h>
#include <linux/slab.h>

#include <dt-bindings/mfd/cros_ec.h>

/**
 * struct cros_ec_pwm_device - Driver data for EC PWM
 *
 * @ec: Pointer to EC device
 * @use_pwm_type: Use PWM types instead of generic channels
 */
struct cros_ec_pwm_device { … };

static inline struct cros_ec_pwm_device *pwm_to_cros_ec_pwm(struct pwm_chip *chip)
{ … }

static int cros_ec_dt_type_to_pwm_type(u8 dt_index, u8 *pwm_type)
{ … }

static int cros_ec_pwm_set_duty(struct cros_ec_pwm_device *ec_pwm, u8 index,
				u16 duty)
{ … }

static int cros_ec_pwm_get_duty(struct cros_ec_device *ec, bool use_pwm_type, u8 index)
{ … }

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

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

static const struct pwm_ops cros_ec_pwm_ops = …;

/*
 * Determine the number of supported PWMs. The EC does not return the number
 * of PWMs it supports directly, so we have to read the pwm duty cycle for
 * subsequent channels until we get an error.
 */
static int cros_ec_num_pwms(struct cros_ec_device *ec)
{ … }

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

#ifdef CONFIG_OF
static const struct of_device_id cros_ec_pwm_of_match[] = …;
MODULE_DEVICE_TABLE(of, cros_ec_pwm_of_match);
#endif

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

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