LXR linux/drivers/mfd/lm3533-ctrlbank.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2/*
   3 * lm3533-ctrlbank.c -- LM3533 Generic Control Bank interface
   4 *
   5 * Copyright (C) 2011-2012 Texas Instruments
   6 *
   7 * Author: Johan Hovold <jhovold@gmail.com>
   8 */
   9
  10#include <linux/device.h>
  11#include <linux/module.h>
  12
  13#include <linux/mfd/lm3533.h>
  14
  15
  16#define LM3533_MAX_CURRENT_MIN          5000
  17#define LM3533_MAX_CURRENT_MAX          29800
  18#define LM3533_MAX_CURRENT_STEP         800
  19
  20#define LM3533_PWM_MAX                  0x3f
  21
  22#define LM3533_REG_PWM_BASE             0x14
  23#define LM3533_REG_MAX_CURRENT_BASE     0x1f
  24#define LM3533_REG_CTRLBANK_ENABLE      0x27
  25#define LM3533_REG_BRIGHTNESS_BASE      0x40
  26
  27
  28static inline u8 lm3533_ctrlbank_get_reg(struct lm3533_ctrlbank *cb, u8 base)
  29{
  30        return base + cb->id;
  31}
  32
  33int lm3533_ctrlbank_enable(struct lm3533_ctrlbank *cb)
  34{
  35        u8 mask;
  36        int ret;
  37
  38        dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
  39
  40        mask = 1 << cb->id;
  41        ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE,
  42                                                                mask, mask);
  43        if (ret)
  44                dev_err(cb->dev, "failed to enable ctrlbank %d\n", cb->id);
  45
  46        return ret;
  47}
  48EXPORT_SYMBOL_GPL(lm3533_ctrlbank_enable);
  49
  50int lm3533_ctrlbank_disable(struct lm3533_ctrlbank *cb)
  51{
  52        u8 mask;
  53        int ret;
  54
  55        dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
  56
  57        mask = 1 << cb->id;
  58        ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE, 0, mask);
  59        if (ret)
  60                dev_err(cb->dev, "failed to disable ctrlbank %d\n", cb->id);
  61
  62        return ret;
  63}
  64EXPORT_SYMBOL_GPL(lm3533_ctrlbank_disable);
  65
  66/*
  67 * Full-scale current.
  68 *
  69 * imax         5000 - 29800 uA (800 uA step)
  70 */
  71int lm3533_ctrlbank_set_max_current(struct lm3533_ctrlbank *cb, u16 imax)
  72{
  73        u8 reg;
  74        u8 val;
  75        int ret;
  76
  77        if (imax < LM3533_MAX_CURRENT_MIN || imax > LM3533_MAX_CURRENT_MAX)
  78                return -EINVAL;
  79
  80        val = (imax - LM3533_MAX_CURRENT_MIN) / LM3533_MAX_CURRENT_STEP;
  81
  82        reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_MAX_CURRENT_BASE);
  83        ret = lm3533_write(cb->lm3533, reg, val);
  84        if (ret)
  85                dev_err(cb->dev, "failed to set max current\n");
  86
  87        return ret;
  88}
  89EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_max_current);
  90
  91int lm3533_ctrlbank_set_brightness(struct lm3533_ctrlbank *cb, u8 val)
  92{
  93        u8 reg;
  94        int ret;
  95
  96        reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_BRIGHTNESS_BASE);
  97        ret = lm3533_write(cb->lm3533, reg, val);
  98        if (ret)
  99                dev_err(cb->dev, "failed to set brightness\n");
 100
 101        return ret;
 102}
 103EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_brightness);
 104
 105int lm3533_ctrlbank_get_brightness(struct lm3533_ctrlbank *cb, u8 *val)
 106{
 107        u8 reg;
 108        int ret;
 109
 110        reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_BRIGHTNESS_BASE);
 111        ret = lm3533_read(cb->lm3533, reg, val);
 112        if (ret)
 113                dev_err(cb->dev, "failed to get brightness\n");
 114
 115        return ret;
 116}
 117EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_brightness);
 118
 119/*
 120 * PWM-input control mask:
 121 *
 122 *   bit 5 - PWM-input enabled in Zone 4
 123 *   bit 4 - PWM-input enabled in Zone 3
 124 *   bit 3 - PWM-input enabled in Zone 2
 125 *   bit 2 - PWM-input enabled in Zone 1
 126 *   bit 1 - PWM-input enabled in Zone 0
 127 *   bit 0 - PWM-input enabled
 128 */
 129int lm3533_ctrlbank_set_pwm(struct lm3533_ctrlbank *cb, u8 val)
 130{
 131        u8 reg;
 132        int ret;
 133
 134        if (val > LM3533_PWM_MAX)
 135                return -EINVAL;
 136
 137        reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_PWM_BASE);
 138        ret = lm3533_write(cb->lm3533, reg, val);
 139        if (ret)
 140                dev_err(cb->dev, "failed to set PWM mask\n");
 141
 142        return ret;
 143}
 144EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_pwm);
 145
 146int lm3533_ctrlbank_get_pwm(struct lm3533_ctrlbank *cb, u8 *val)
 147{
 148        u8 reg;
 149        int ret;
 150
 151        reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_PWM_BASE);
 152        ret = lm3533_read(cb->lm3533, reg, val);
 153        if (ret)
 154                dev_err(cb->dev, "failed to get PWM mask\n");
 155
 156        return ret;
 157}
 158EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_pwm);
 159
 160MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
 161MODULE_DESCRIPTION("LM3533 Control Bank interface");
 162MODULE_LICENSE("GPL");
 163