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_BRIGHTNESS_MAX           255
  21 #define LM3533_MAX_CURRENT_MAX          31
  22 #define LM3533_PWM_MAX                  0x3f
  23
  24 #define LM3533_REG_PWM_BASE             0x14
  25 #define LM3533_REG_MAX_CURRENT_BASE     0x1f
  26 #define LM3533_REG_CTRLBANK_ENABLE      0x27
  27 #define LM3533_REG_BRIGHTNESS_BASE      0x40
  28
  29
  30 static inline u8 lm3533_ctrlbank_get_reg(struct lm3533_ctrlbank *cb, u8 base)
  31 {
  32         return base + cb->id;
  33 }
  34
  35 int lm3533_ctrlbank_enable(struct lm3533_ctrlbank *cb)
  36 {
  37         u8 mask;
  38         int ret;
  39
  40         dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
  41
  42         mask = 1 << cb->id;
  43         ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE,
  44                                                                 mask, mask);
  45         if (ret)
  46                 dev_err(cb->dev, "failed to enable ctrlbank %d\n", cb->id);
  47
  48         return ret;
  49 }
  50 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_enable);
  51
  52 int lm3533_ctrlbank_disable(struct lm3533_ctrlbank *cb)
  53 {
  54         u8 mask;
  55         int ret;
  56
  57         dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
  58
  59         mask = 1 << cb->id;
  60         ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE, 0, mask);
  61         if (ret)
  62                 dev_err(cb->dev, "failed to disable ctrlbank %d\n", cb->id);
  63
  64         return ret;
  65 }
  66 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_disable);
  67
  68 #define lm3533_ctrlbank_set(_name, _NAME)                               \
  69 int lm3533_ctrlbank_set_##_name(struct lm3533_ctrlbank *cb, u8 val)     \
  70 {                                                                       \
  71         u8 reg;                                                         \
  72         int ret;                                                        \
  73                                                                         \
  74         if (val > LM3533_##_NAME##_MAX)                                 \
  75                 return -EINVAL;                                         \
  76                                                                         \
  77         reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_##_NAME##_BASE);   \
  78         ret = lm3533_write(cb->lm3533, reg, val);                       \
  79         if (ret)                                                        \
  80                 dev_err(cb->dev, "failed to set " #_name "\n");         \
  81                                                                         \
  82         return ret;                                                     \
  83 }                                                                       \
  84 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_##_name);
  85
  86 #define lm3533_ctrlbank_get(_name, _NAME)                               \
  87 int lm3533_ctrlbank_get_##_name(struct lm3533_ctrlbank *cb, u8 *val)    \
  88 {                                                                       \
  89         u8 reg;                                                         \
  90         int ret;                                                        \
  91                                                                         \
  92         reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_##_NAME##_BASE);   \
  93         ret = lm3533_read(cb->lm3533, reg, val);                        \
  94         if (ret)                                                        \
  95                 dev_err(cb->dev, "failed to get " #_name "\n");         \
  96                                                                         \
  97         return ret;                                                     \
  98 }                                                                       \
  99 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_##_name);
 100
 101 lm3533_ctrlbank_set(brightness, BRIGHTNESS);
 102 lm3533_ctrlbank_get(brightness, BRIGHTNESS);
 103
 104 /*
 105  * Full scale current.
 106  *
 107  * Imax = 5 + val * 0.8 mA, e.g.:
 108  *
 109  *    0 - 5 mA
 110  *     ...
 111  *   19 - 20.2 mA (default)
 112  *     ...
 113  *   31 - 29.8 mA
 114  */
 115 lm3533_ctrlbank_set(max_current, MAX_CURRENT);
 116 lm3533_ctrlbank_get(max_current, MAX_CURRENT);
 117
 118 /*
 119  * PWM-input control mask:
 120  *
 121  *   bit 5 - PWM-input enabled in Zone 4
 122  *   bit 4 - PWM-input enabled in Zone 3
 123  *   bit 3 - PWM-input enabled in Zone 2
 124  *   bit 2 - PWM-input enabled in Zone 1
 125  *   bit 1 - PWM-input enabled in Zone 0
 126  *   bit 0 - PWM-input enabled
 127  */
 128 lm3533_ctrlbank_set(pwm, PWM);
 129 lm3533_ctrlbank_get(pwm, PWM);
 130
 131
 132 MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
 133 MODULE_DESCRIPTION("LM3533 Control Bank interface");
 134 MODULE_LICENSE("GPL");