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_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
 29static inline u8 lm3533_ctrlbank_get_reg(struct lm3533_ctrlbank *cb, u8 base)
 30{
 31	return base + cb->id;
 32}
 33
 34int 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}
 49EXPORT_SYMBOL_GPL(lm3533_ctrlbank_enable);
 50
 51int 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}
 65EXPORT_SYMBOL_GPL(lm3533_ctrlbank_disable);
 66
 67/*
 68 * Full-scale current.
 69 *
 70 * imax		5000 - 29800 uA (800 uA step)
 71 */
 72int 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}
 90EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_max_current);
 91
 92#define lm3533_ctrlbank_set(_name, _NAME)				\
 93int 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}									\
108EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_##_name);
109
110#define lm3533_ctrlbank_get(_name, _NAME)				\
111int 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}									\
123EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_##_name);
124
125lm3533_ctrlbank_set(brightness, BRIGHTNESS);
126lm3533_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 */
138lm3533_ctrlbank_set(pwm, PWM);
139lm3533_ctrlbank_get(pwm, PWM);
140
141
142MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
143MODULE_DESCRIPTION("LM3533 Control Bank interface");
144MODULE_LICENSE("GPL");