linux/drivers/mfd/lm3533-ctrlbank.c
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   1/*
   2 * lm3533-ctrlbank.c -- LM3533 Generic Control Bank interface
   3 *
   4 * Copyright (C) 2011-2012 Texas Instruments
   5 *
   6 * Author: Johan Hovold <jhovold@gmail.com>
   7 *
   8 * This program is free software; you can redistribute it and/or modify it
   9 * under  the terms of the GNU General  Public License as published by the
  10 * Free Software Foundation;  either version 2 of the License, or (at your
  11 * option) any later version.
  12 */
  13
  14#include <linux/device.h>
  15#include <linux/module.h>
  16
  17#include <linux/mfd/lm3533.h>
  18
  19
  20#define LM3533_MAX_CURRENT_MIN          5000
  21#define LM3533_MAX_CURRENT_MAX          29800
  22#define LM3533_MAX_CURRENT_STEP         800
  23
  24#define LM3533_BRIGHTNESS_MAX           255
  25#define LM3533_PWM_MAX                  0x3f
  26
  27#define LM3533_REG_PWM_BASE             0x14
  28#define LM3533_REG_MAX_CURRENT_BASE     0x1f
  29#define LM3533_REG_CTRLBANK_ENABLE      0x27
  30#define LM3533_REG_BRIGHTNESS_BASE      0x40
  31
  32
  33static inline u8 lm3533_ctrlbank_get_reg(struct lm3533_ctrlbank *cb, u8 base)
  34{
  35        return base + cb->id;
  36}
  37
  38int lm3533_ctrlbank_enable(struct lm3533_ctrlbank *cb)
  39{
  40        u8 mask;
  41        int ret;
  42
  43        dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
  44
  45        mask = 1 << cb->id;
  46        ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE,
  47                                                                mask, mask);
  48        if (ret)
  49                dev_err(cb->dev, "failed to enable ctrlbank %d\n", cb->id);
  50
  51        return ret;
  52}
  53EXPORT_SYMBOL_GPL(lm3533_ctrlbank_enable);
  54
  55int lm3533_ctrlbank_disable(struct lm3533_ctrlbank *cb)
  56{
  57        u8 mask;
  58        int ret;
  59
  60        dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
  61
  62        mask = 1 << cb->id;
  63        ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE, 0, mask);
  64        if (ret)
  65                dev_err(cb->dev, "failed to disable ctrlbank %d\n", cb->id);
  66
  67        return ret;
  68}
  69EXPORT_SYMBOL_GPL(lm3533_ctrlbank_disable);
  70
  71/*
  72 * Full-scale current.
  73 *
  74 * imax         5000 - 29800 uA (800 uA step)
  75 */
  76int lm3533_ctrlbank_set_max_current(struct lm3533_ctrlbank *cb, u16 imax)
  77{
  78        u8 reg;
  79        u8 val;
  80        int ret;
  81
  82        if (imax < LM3533_MAX_CURRENT_MIN || imax > LM3533_MAX_CURRENT_MAX)
  83                return -EINVAL;
  84
  85        val = (imax - LM3533_MAX_CURRENT_MIN) / LM3533_MAX_CURRENT_STEP;
  86
  87        reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_MAX_CURRENT_BASE);
  88        ret = lm3533_write(cb->lm3533, reg, val);
  89        if (ret)
  90                dev_err(cb->dev, "failed to set max current\n");
  91
  92        return ret;
  93}
  94EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_max_current);
  95
  96#define lm3533_ctrlbank_set(_name, _NAME)                               \
  97int lm3533_ctrlbank_set_##_name(struct lm3533_ctrlbank *cb, u8 val)     \
  98{                                                                       \
  99        u8 reg;                                                         \
 100        int ret;                                                        \
 101                                                                        \
 102        if (val > LM3533_##_NAME##_MAX)                                 \
 103                return -EINVAL;                                         \
 104                                                                        \
 105        reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_##_NAME##_BASE);   \
 106        ret = lm3533_write(cb->lm3533, reg, val);                       \
 107        if (ret)                                                        \
 108                dev_err(cb->dev, "failed to set " #_name "\n");         \
 109                                                                        \
 110        return ret;                                                     \
 111}                                                                       \
 112EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_##_name);
 113
 114#define lm3533_ctrlbank_get(_name, _NAME)                               \
 115int lm3533_ctrlbank_get_##_name(struct lm3533_ctrlbank *cb, u8 *val)    \
 116{                                                                       \
 117        u8 reg;                                                         \
 118        int ret;                                                        \
 119                                                                        \
 120        reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_##_NAME##_BASE);   \
 121        ret = lm3533_read(cb->lm3533, reg, val);                        \
 122        if (ret)                                                        \
 123                dev_err(cb->dev, "failed to get " #_name "\n");         \
 124                                                                        \
 125        return ret;                                                     \
 126}                                                                       \
 127EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_##_name);
 128
 129lm3533_ctrlbank_set(brightness, BRIGHTNESS);
 130lm3533_ctrlbank_get(brightness, BRIGHTNESS);
 131
 132/*
 133 * PWM-input control mask:
 134 *
 135 *   bit 5 - PWM-input enabled in Zone 4
 136 *   bit 4 - PWM-input enabled in Zone 3
 137 *   bit 3 - PWM-input enabled in Zone 2
 138 *   bit 2 - PWM-input enabled in Zone 1
 139 *   bit 1 - PWM-input enabled in Zone 0
 140 *   bit 0 - PWM-input enabled
 141 */
 142lm3533_ctrlbank_set(pwm, PWM);
 143lm3533_ctrlbank_get(pwm, PWM);
 144
 145
 146MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
 147MODULE_DESCRIPTION("LM3533 Control Bank interface");
 148MODULE_LICENSE("GPL");
 149
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