lm3533-ctrlbank.c

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/*
 * lm3533-ctrlbank.c -- LM3533 Generic Control Bank interface
 *
 * Copyright (C) 2011-2012 Texas Instruments
 *
 * Author: Johan Hovold <[email protected]>
 *
 * 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.
 */

#include <linux/device.h>
#include <linux/module.h>

#include <linux/mfd/lm3533.h>


#define LM3533_MAX_CURRENT_MIN      5000
#define LM3533_MAX_CURRENT_MAX      29800
#define LM3533_MAX_CURRENT_STEP     800

#define LM3533_BRIGHTNESS_MAX       255
#define LM3533_PWM_MAX          0x3f

#define LM3533_REG_PWM_BASE     0x14
#define LM3533_REG_MAX_CURRENT_BASE 0x1f
#define LM3533_REG_CTRLBANK_ENABLE  0x27
#define LM3533_REG_BRIGHTNESS_BASE  0x40


static inline u8 lm3533_ctrlbank_get_reg(struct lm3533_ctrlbank *cb, u8 base)
{
    return base + cb->id;
}

int lm3533_ctrlbank_enable(struct lm3533_ctrlbank *cb)
{
    u8 mask;
    int ret;

    dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);

    mask = 1 << cb->id;
    ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE,
                                mask, mask);
    if (ret)
        dev_err(cb->dev, "failed to enable ctrlbank %d\n", cb->id);

    return ret;
}
EXPORT_SYMBOL_GPL(lm3533_ctrlbank_enable);

int lm3533_ctrlbank_disable(struct lm3533_ctrlbank *cb)
{
    u8 mask;
    int ret;

    dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);

    mask = 1 << cb->id;
    ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE, 0, mask);
    if (ret)
        dev_err(cb->dev, "failed to disable ctrlbank %d\n", cb->id);

    return ret;
}
EXPORT_SYMBOL_GPL(lm3533_ctrlbank_disable);

/*
 * Full-scale current.
 *
 * imax     5000 - 29800 uA (800 uA step)
 */
int lm3533_ctrlbank_set_max_current(struct lm3533_ctrlbank *cb, u16 imax)
{
    u8 reg;
    u8 val;
    int ret;

    if (imax < LM3533_MAX_CURRENT_MIN || imax > LM3533_MAX_CURRENT_MAX)
        return -EINVAL;

    val = (imax - LM3533_MAX_CURRENT_MIN) / LM3533_MAX_CURRENT_STEP;

    reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_MAX_CURRENT_BASE);
    ret = lm3533_write(cb->lm3533, reg, val);
    if (ret)
        dev_err(cb->dev, "failed to set max current\n");

    return ret;
}
EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_max_current);

#define lm3533_ctrlbank_set(_name, _NAME)               \
int lm3533_ctrlbank_set_##_name(struct lm3533_ctrlbank *cb, u8 val) \
{                                   \
    u8 reg;                             \
    int ret;                            \
                                    \
    if (val > LM3533_##_NAME##_MAX)                 \
        return -EINVAL;                     \
                                    \
    reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_##_NAME##_BASE);   \
    ret = lm3533_write(cb->lm3533, reg, val);           \
    if (ret)                            \
        dev_err(cb->dev, "failed to set " #_name "\n");     \
                                    \
    return ret;                         \
}                                   \
EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_##_name);

#define lm3533_ctrlbank_get(_name, _NAME)               \
int lm3533_ctrlbank_get_##_name(struct lm3533_ctrlbank *cb, u8 *val)    \
{                                   \
    u8 reg;                             \
    int ret;                            \
                                    \
    reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_##_NAME##_BASE);   \
    ret = lm3533_read(cb->lm3533, reg, val);            \
    if (ret)                            \
        dev_err(cb->dev, "failed to get " #_name "\n");     \
                                    \
    return ret;                         \
}                                   \
EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_##_name);

lm3533_ctrlbank_set(brightness, BRIGHTNESS);
lm3533_ctrlbank_get(brightness, BRIGHTNESS);

/*
 * PWM-input control mask:
 *
 *   bit 5 - PWM-input enabled in Zone 4
 *   bit 4 - PWM-input enabled in Zone 3
 *   bit 3 - PWM-input enabled in Zone 2
 *   bit 2 - PWM-input enabled in Zone 1
 *   bit 1 - PWM-input enabled in Zone 0
 *   bit 0 - PWM-input enabled
 */
lm3533_ctrlbank_set(pwm, PWM);
lm3533_ctrlbank_get(pwm, PWM);


MODULE_AUTHOR("Johan Hovold <[email protected]>");
MODULE_DESCRIPTION("LM3533 Control Bank interface");
MODULE_LICENSE("GPL");