linux-imx

// 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/mfd/cros_ec.h>

#include <linux/mfd/cros_ec_commands.h>

#include <linux/platform_device.h>

#include <linux/pwm.h>

#include <linux/slab.h>

​

/**

 * struct cros_ec_pwm_device - Driver data for EC PWM

 *

 * @dev: Device node

 * @ec: Pointer to EC device

 * @chip: PWM controller chip

 */

struct cros_ec_pwm_device {

    struct device *dev;

    struct cros_ec_device *ec;

    struct pwm_chip chip;

};

​

static inline struct cros_ec_pwm_device *pwm_to_cros_ec_pwm(struct pwm_chip *c)

{

    return container_of(c, struct cros_ec_pwm_device, chip);

}

​

static int cros_ec_pwm_set_duty(struct cros_ec_device *ec, u8 index, u16 duty)

{

    struct {

        struct cros_ec_command msg;

        struct ec_params_pwm_set_duty params;

    } __packed buf;

    struct ec_params_pwm_set_duty *params = &buf.params;

    struct cros_ec_command *msg = &buf.msg;

​

    memset(&buf, 0, sizeof(buf));

​

    msg->version = 0;

    msg->command = EC_CMD_PWM_SET_DUTY;

    msg->insize = 0;

    msg->outsize = sizeof(*params);

​

    params->duty = duty;

    params->pwm_type = EC_PWM_TYPE_GENERIC;

    params->index = index;

​

    return cros_ec_cmd_xfer_status(ec, msg);

}

​

static int __cros_ec_pwm_get_duty(struct cros_ec_device *ec, u8 index,

                  u32 *result)

{

    struct {

        struct cros_ec_command msg;

        union {

            struct ec_params_pwm_get_duty params;

            struct ec_response_pwm_get_duty resp;