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
  28 static inline u8 lm3533_ctrlbank_get_reg(struct lm3533_ctrlbank *cb, u8 base)
  29 {
  30         return base + cb->id;
  31 }
  32
  33 int 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 }
  48 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_enable);
  49
  50 int 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 }
  64 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_disable);
  65
  66 /*
  67  * Full-scale current.
  68  *
  69  * imax         5000 - 29800 uA (800 uA step)
  70  */
  71 int 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 }
  89 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_max_current);
  90
  91 int 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 }
 103 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_brightness);
 104
 105 int 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 }
 117 EXPORT_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  */
 129 int 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 }
 144 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_pwm);
 145
 146 int 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 }
 158 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_pwm);
 159
 160 MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
 161 MODULE_DESCRIPTION("LM3533 Control Bank interface");
 162 MODULE_LICENSE("GPL");