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_PWM_MAX			0x3f
 21
 22#define LM3533_REG_PWM_BASE		0x14
 23#define LM3533_REG_MAX_CURRENT_BASE	0x1f
 24#define LM3533_REG_CTRLBANK_ENABLE	0x27
 25#define LM3533_REG_BRIGHTNESS_BASE	0x40
 26
 27
 28static inline u8 lm3533_ctrlbank_get_reg(struct lm3533_ctrlbank *cb, u8 base)
 29{
 30	return base + cb->id;
 31}
 32
 33int lm3533_ctrlbank_enable(struct lm3533_ctrlbank *cb)
 34{
 35	u8 mask;
 36	int ret;
 37
 38	dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
 39
 40	mask = 1 << cb->id;
 41	ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE,
 42								mask, mask);
 43	if (ret)
 44		dev_err(cb->dev, "failed to enable ctrlbank %d\n", cb->id);
 45
 46	return ret;
 47}
 48EXPORT_SYMBOL_GPL(lm3533_ctrlbank_enable);
 49
 50int lm3533_ctrlbank_disable(struct lm3533_ctrlbank *cb)
 51{
 52	u8 mask;
 53	int ret;
 54
 55	dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
 56
 57	mask = 1 << cb->id;
 58	ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE, 0, mask);
 59	if (ret)
 60		dev_err(cb->dev, "failed to disable ctrlbank %d\n", cb->id);
 61
 62	return ret;
 63}
 64EXPORT_SYMBOL_GPL(lm3533_ctrlbank_disable);
 65
 66/*
 67 * Full-scale current.
 68 *
 69 * imax		5000 - 29800 uA (800 uA step)
 70 */
 71int lm3533_ctrlbank_set_max_current(struct lm3533_ctrlbank *cb, u16 imax)
 72{
 73	u8 reg;
 74	u8 val;
 75	int ret;
 76
 77	if (imax < LM3533_MAX_CURRENT_MIN || imax > LM3533_MAX_CURRENT_MAX)
 78		return -EINVAL;
 79
 80	val = (imax - LM3533_MAX_CURRENT_MIN) / LM3533_MAX_CURRENT_STEP;
 81
 82	reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_MAX_CURRENT_BASE);
 83	ret = lm3533_write(cb->lm3533, reg, val);
 84	if (ret)
 85		dev_err(cb->dev, "failed to set max current\n");
 86
 87	return ret;
 88}
 89EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_max_current);
 90
 91int lm3533_ctrlbank_set_brightness(struct lm3533_ctrlbank *cb, u8 val)
 92{
 93	u8 reg;
 94	int ret;
 95
 96	reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_BRIGHTNESS_BASE);
 97	ret = lm3533_write(cb->lm3533, reg, val);
 98	if (ret)
 99		dev_err(cb->dev, "failed to set brightness\n");
100
101	return ret;
102}
103EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_brightness);
104
105int lm3533_ctrlbank_get_brightness(struct lm3533_ctrlbank *cb, u8 *val)
106{
107	u8 reg;
108	int ret;
109
110	reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_BRIGHTNESS_BASE);
111	ret = lm3533_read(cb->lm3533, reg, val);
112	if (ret)
113		dev_err(cb->dev, "failed to get brightness\n");
114
115	return ret;
116}
117EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_brightness);
118
119/*
120 * PWM-input control mask:
121 *
122 *   bit 5 - PWM-input enabled in Zone 4
123 *   bit 4 - PWM-input enabled in Zone 3
124 *   bit 3 - PWM-input enabled in Zone 2
125 *   bit 2 - PWM-input enabled in Zone 1
126 *   bit 1 - PWM-input enabled in Zone 0
127 *   bit 0 - PWM-input enabled
128 */
129int lm3533_ctrlbank_set_pwm(struct lm3533_ctrlbank *cb, u8 val)
130{
131	u8 reg;
132	int ret;
133
134	if (val > LM3533_PWM_MAX)
135		return -EINVAL;
136
137	reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_PWM_BASE);
138	ret = lm3533_write(cb->lm3533, reg, val);
139	if (ret)
140		dev_err(cb->dev, "failed to set PWM mask\n");
141
142	return ret;
143}
144EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_pwm);
145
146int lm3533_ctrlbank_get_pwm(struct lm3533_ctrlbank *cb, u8 *val)
147{
148	u8 reg;
149	int ret;
150
151	reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_PWM_BASE);
152	ret = lm3533_read(cb->lm3533, reg, val);
153	if (ret)
154		dev_err(cb->dev, "failed to get PWM mask\n");
155
156	return ret;
157}
158EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_pwm);
159
160MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
161MODULE_DESCRIPTION("LM3533 Control Bank interface");
162MODULE_LICENSE("GPL");