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 29 static inline u8 lm3533_ctrlbank_get_reg(struct lm3533_ctrlbank *cb, u8 base) 30 { 31 return base + cb->id; 32 } 33 34 int 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 } 49 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_enable); 50 51 int 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 } 65 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_disable); 66 67 /* 68 * Full-scale current. 69 * 70 * imax 5000 - 29800 uA (800 uA step) 71 */ 72 int 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 } 90 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_max_current); 91 92 #define lm3533_ctrlbank_set(_name, _NAME) \ 93 int 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 } \ 108 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_##_name); 109 110 #define lm3533_ctrlbank_get(_name, _NAME) \ 111 int 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 } \ 123 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_##_name); 124 125 lm3533_ctrlbank_set(brightness, BRIGHTNESS); 126 lm3533_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 */ 138 lm3533_ctrlbank_set(pwm, PWM); 139 lm3533_ctrlbank_get(pwm, PWM); 140 141 142 MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>"); 143 MODULE_DESCRIPTION("LM3533 Control Bank interface"); 144 MODULE_LICENSE("GPL"); 145