linux-imx

// SPDX-License-Identifier: GPL-2.0-only

/*

 *  LED driver for TI lp3952 controller

 *

 *  Copyright (C) 2016, DAQRI, LLC.

 *  Author: Tony Makkiel <tony.makkiel@daqri.com>

 */

​

#include <linux/delay.h>

#include <linux/gpio.h>

#include <linux/i2c.h>

#include <linux/io.h>

#include <linux/kernel.h>

#include <linux/leds.h>

#include <linux/leds-lp3952.h>

#include <linux/module.h>

#include <linux/notifier.h>

#include <linux/platform_device.h>

#include <linux/pm.h>

#include <linux/reboot.h>

#include <linux/regmap.h>

​

static int lp3952_register_write(struct i2c_client *client, u8 reg, u8 val)

{

    int ret;

    struct lp3952_led_array *priv = i2c_get_clientdata(client);

​

    ret = regmap_write(priv->regmap, reg, val);

​

    if (ret)

        dev_err(&client->dev, "%s: reg 0x%x, val 0x%x, err %d\n",

            __func__, reg, val, ret);

    return ret;

}

​

static void lp3952_on_off(struct lp3952_led_array *priv,

              enum lp3952_leds led_id, bool on)

{

    int ret, val;

​

    dev_dbg(&priv->client->dev, "%s LED %d to %d\n", __func__, led_id, on);

​

    val = 1 << led_id;

    if (led_id == LP3952_LED_ALL)

        val = LP3952_LED_MASK_ALL;

​

    ret = regmap_update_bits(priv->regmap, LP3952_REG_LED_CTRL, val,

                 on ? val : 0);

    if (ret)

        dev_err(&priv->client->dev, "%s, Error %d\n", __func__, ret);

}

​

/*

 * Using Imax to control brightness. There are 4 possible

 * setting 25, 50, 75 and 100 % of Imax. Possible values are

 * values 0-4. 0 meaning turn off.

 */

static int lp3952_set_brightness(struct led_classdev *cdev,

                 enum led_brightness value)

{

    unsigned int reg, shift_val;

    struct lp3952_ctrl_hdl *led = container_of(cdev,

                           struct lp3952_ctrl_hdl,