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");