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 <[email protected]>
   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_BRIGHTNESS_MAX           255
  21 #define LM3533_PWM_MAX                  0x3f
  22
  23 #define LM3533_REG_PWM_BASE             0x14
  24 #define LM3533_REG_MAX_CURRENT_BASE     0x1f
  25 #define LM3533_REG_CTRLBANK_ENABLE      0x27
  26 #define LM3533_REG_BRIGHTNESS_BASE      0x40
  27
  28
  29 static inline u8 lm3533_ctrlbank_get_reg(struct lm3533_ctrlbank *cb, u8 base)
  30 {
  31         return base + cb->id;
  32 }
  33
  34 int lm3533_ctrlbank_enable(struct lm3533_ctrlbank *cb)
  35 {
  36         u8 mask;
  37         int ret;
  38
  39         dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
  40
  41         mask = 1 << cb->id;
  42         ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE,
  43                                                                 mask, mask);
  44         if (ret)
  45                 dev_err(cb->dev, "failed to enable ctrlbank %d\n", cb->id);
  46
  47         return ret;
  48 }
  49 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_enable);
  50
  51 int lm3533_ctrlbank_disable(struct lm3533_ctrlbank *cb)
  52 {
  53         u8 mask;
  54         int ret;
  55
  56         dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
  57
  58         mask = 1 << cb->id;
  59         ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE, 0, mask);
  60         if (ret)
  61                 dev_err(cb->dev, "failed to disable ctrlbank %d\n", cb->id);
  62
  63         return ret;
  64 }
  65 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_disable);
  66
  67 /*
  68  * Full-scale current.
  69  *
  70  * imax         5000 - 29800 uA (800 uA step)
  71  */
  72 int lm3533_ctrlbank_set_max_current(struct lm3533_ctrlbank *cb, u16 imax)
  73 {
  74         u8 reg;
  75         u8 val;
  76         int ret;
  77
  78         if (imax < LM3533_MAX_CURRENT_MIN || imax > LM3533_MAX_CURRENT_MAX)
  79                 return -EINVAL;
  80
  81         val = (imax - LM3533_MAX_CURRENT_MIN) / LM3533_MAX_CURRENT_STEP;
  82
  83         reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_MAX_CURRENT_BASE);
  84         ret = lm3533_write(cb->lm3533, reg, val);
  85         if (ret)
  86                 dev_err(cb->dev, "failed to set max current\n");
  87
  88         return ret;
  89 }
  90 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_max_current);
  91
  92 #define lm3533_ctrlbank_set(_name, _NAME)                               \
  93 int lm3533_ctrlbank_set_##_name(struct lm3533_ctrlbank *cb, u8 val)     \
  94 {                                                                       \
  95         u8 reg;                                                         \
  96         int ret;                                                        \
  97                                                                         \
  98         if (val > LM3533_##_NAME##_MAX)                                 \
  99                 return -EINVAL;                                         \
 100                                                                         \
 101         reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_##_NAME##_BASE);   \
 102         ret = lm3533_write(cb->lm3533, reg, val);                       \
 103         if (ret)                                                        \
 104                 dev_err(cb->dev, "failed to set " #_name "\n");         \
 105                                                                         \
 106         return ret;                                                     \
 107 }                                                                       \
 108 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_##_name);
 109
 110 #define lm3533_ctrlbank_get(_name, _NAME)                               \
 111 int lm3533_ctrlbank_get_##_name(struct lm3533_ctrlbank *cb, u8 *val)    \
 112 {                                                                       \
 113         u8 reg;                                                         \
 114         int ret;                                                        \
 115                                                                         \
 116         reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_##_NAME##_BASE);   \
 117         ret = lm3533_read(cb->lm3533, reg, val);                        \
 118         if (ret)                                                        \
 119                 dev_err(cb->dev, "failed to get " #_name "\n");         \
 120                                                                         \
 121         return ret;                                                     \
 122 }                                                                       \
 123 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_##_name);
 124
 125 lm3533_ctrlbank_set(brightness, BRIGHTNESS);
 126 lm3533_ctrlbank_get(brightness, BRIGHTNESS);
 127
 128 /*
 129  * PWM-input control mask:
 130  *
 131  *   bit 5 - PWM-input enabled in Zone 4
 132  *   bit 4 - PWM-input enabled in Zone 3
 133  *   bit 3 - PWM-input enabled in Zone 2
 134  *   bit 2 - PWM-input enabled in Zone 1
 135  *   bit 1 - PWM-input enabled in Zone 0
 136  *   bit 0 - PWM-input enabled
 137  */
 138 lm3533_ctrlbank_set(pwm, PWM);
 139 lm3533_ctrlbank_get(pwm, PWM);
 140
 141
 142 MODULE_AUTHOR("Johan Hovold <[email protected]>");
 143 MODULE_DESCRIPTION("LM3533 Control Bank interface");
 144 MODULE_LICENSE("GPL");