cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

lm3533-ctrlbank.c (3704B)

      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");