drivers/mfd/lm3533-ctrlbank.c

   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
  33 static inline u8 lm3533_ctrlbank_get_reg(struct lm3533_ctrlbank *cb, u8 base)
  34 {
  35         return base + cb->id;
  36 }
  37
  38 int 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 }
  53 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_enable);
  54
  55 int 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 }
  69 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_disable);
  70
  71 /*
  72  * Full-scale current.
  73  *
  74  * imax         5000 - 29800 uA (800 uA step)
  75  */
  76 int 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 }
  94 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_max_current);
  95
  96 #define lm3533_ctrlbank_set(_name, _NAME)                               \
  97 int 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 }                                                                       \
 112 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_##_name);
 113
 114 #define lm3533_ctrlbank_get(_name, _NAME)                               \
 115 int 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 }                                                                       \
 127 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_##_name);
 128
 129 lm3533_ctrlbank_set(brightness, BRIGHTNESS);
 130 lm3533_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  */
 142 lm3533_ctrlbank_set(pwm, PWM);
 143 lm3533_ctrlbank_get(pwm, PWM);
 144
 145
 146 MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
 147 MODULE_DESCRIPTION("LM3533 Control Bank interface");
 148 MODULE_LICENSE("GPL");