drivers/mfd/lm3533-ctrlbank.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * lm3533-ctrlbank.c -- LM3533 Generic Control Bank interface
0004  *
0005  * Copyright (C) 2011-2012 Texas Instruments
0006  *
0007  * Author: Johan Hovold <jhovold@gmail.com>
0008  */
0009
0010 #include <linux/device.h>
0011 #include <linux/module.h>
0012
0013 #include <linux/mfd/lm3533.h>
0014
0015
0016 #define LM3533_MAX_CURRENT_MIN      5000
0017 #define LM3533_MAX_CURRENT_MAX      29800
0018 #define LM3533_MAX_CURRENT_STEP     800
0019
0020 #define LM3533_PWM_MAX          0x3f
0021
0022 #define LM3533_REG_PWM_BASE     0x14
0023 #define LM3533_REG_MAX_CURRENT_BASE 0x1f
0024 #define LM3533_REG_CTRLBANK_ENABLE  0x27
0025 #define LM3533_REG_BRIGHTNESS_BASE  0x40
0026
0027
0028 static inline u8 lm3533_ctrlbank_get_reg(struct lm3533_ctrlbank *cb, u8 base)
0029 {
0030     return base + cb->id;
0031 }
0032
0033 int lm3533_ctrlbank_enable(struct lm3533_ctrlbank *cb)
0034 {
0035     u8 mask;
0036     int ret;
0037
0038     dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
0039
0040     mask = 1 << cb->id;
0041     ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE,
0042                                 mask, mask);
0043     if (ret)
0044         dev_err(cb->dev, "failed to enable ctrlbank %d\n", cb->id);
0045
0046     return ret;
0047 }
0048 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_enable);
0049
0050 int lm3533_ctrlbank_disable(struct lm3533_ctrlbank *cb)
0051 {
0052     u8 mask;
0053     int ret;
0054
0055     dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
0056
0057     mask = 1 << cb->id;
0058     ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE, 0, mask);
0059     if (ret)
0060         dev_err(cb->dev, "failed to disable ctrlbank %d\n", cb->id);
0061
0062     return ret;
0063 }
0064 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_disable);
0065
0066 /*
0067  * Full-scale current.
0068  *
0069  * imax     5000 - 29800 uA (800 uA step)
0070  */
0071 int lm3533_ctrlbank_set_max_current(struct lm3533_ctrlbank *cb, u16 imax)
0072 {
0073     u8 reg;
0074     u8 val;
0075     int ret;
0076
0077     if (imax < LM3533_MAX_CURRENT_MIN || imax > LM3533_MAX_CURRENT_MAX)
0078         return -EINVAL;
0079
0080     val = (imax - LM3533_MAX_CURRENT_MIN) / LM3533_MAX_CURRENT_STEP;
0081
0082     reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_MAX_CURRENT_BASE);
0083     ret = lm3533_write(cb->lm3533, reg, val);
0084     if (ret)
0085         dev_err(cb->dev, "failed to set max current\n");
0086
0087     return ret;
0088 }
0089 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_max_current);
0090
0091 int lm3533_ctrlbank_set_brightness(struct lm3533_ctrlbank *cb, u8 val)
0092 {
0093     u8 reg;
0094     int ret;
0095
0096     reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_BRIGHTNESS_BASE);
0097     ret = lm3533_write(cb->lm3533, reg, val);
0098     if (ret)
0099         dev_err(cb->dev, "failed to set brightness\n");
0100
0101     return ret;
0102 }
0103 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_brightness);
0104
0105 int lm3533_ctrlbank_get_brightness(struct lm3533_ctrlbank *cb, u8 *val)
0106 {
0107     u8 reg;
0108     int ret;
0109
0110     reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_BRIGHTNESS_BASE);
0111     ret = lm3533_read(cb->lm3533, reg, val);
0112     if (ret)
0113         dev_err(cb->dev, "failed to get brightness\n");
0114
0115     return ret;
0116 }
0117 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_brightness);
0118
0119 /*
0120  * PWM-input control mask:
0121  *
0122  *   bit 5 - PWM-input enabled in Zone 4
0123  *   bit 4 - PWM-input enabled in Zone 3
0124  *   bit 3 - PWM-input enabled in Zone 2
0125  *   bit 2 - PWM-input enabled in Zone 1
0126  *   bit 1 - PWM-input enabled in Zone 0
0127  *   bit 0 - PWM-input enabled
0128  */
0129 int lm3533_ctrlbank_set_pwm(struct lm3533_ctrlbank *cb, u8 val)
0130 {
0131     u8 reg;
0132     int ret;
0133
0134     if (val > LM3533_PWM_MAX)
0135         return -EINVAL;
0136
0137     reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_PWM_BASE);
0138     ret = lm3533_write(cb->lm3533, reg, val);
0139     if (ret)
0140         dev_err(cb->dev, "failed to set PWM mask\n");
0141
0142     return ret;
0143 }
0144 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_pwm);
0145
0146 int lm3533_ctrlbank_get_pwm(struct lm3533_ctrlbank *cb, u8 *val)
0147 {
0148     u8 reg;
0149     int ret;
0150
0151     reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_PWM_BASE);
0152     ret = lm3533_read(cb->lm3533, reg, val);
0153     if (ret)
0154         dev_err(cb->dev, "failed to get PWM mask\n");
0155
0156     return ret;
0157 }
0158 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_pwm);
0159
0160 MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
0161 MODULE_DESCRIPTION("LM3533 Control Bank interface");
0162 MODULE_LICENSE("GPL");