1 /* 2 * lm3533-ctrlbank.c -- LM3533 Generic Control Bank interface 3 * 4 * Copyright (C) 2011-2012 Texas Instruments 5 * 6 * Author: Johan Hovold <jhovold@gmail.com> 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms of the GNU General Public License as published by the 10 * Free Software Foundation; either version 2 of the License, or (at your 11 * option) any later version. 12 */ 13 14 #include <linux/device.h> 15 #include <linux/module.h> 16 17 #include <linux/mfd/lm3533.h> 18 19 20 #define LM3533_MAX_CURRENT_MIN 5000 21 #define LM3533_MAX_CURRENT_MAX 29800 22 #define LM3533_MAX_CURRENT_STEP 800 23 24 #define LM3533_BRIGHTNESS_MAX 255 25 #define LM3533_PWM_MAX 0x3f 26 27 #define LM3533_REG_PWM_BASE 0x14 28 #define LM3533_REG_MAX_CURRENT_BASE 0x1f 29 #define LM3533_REG_CTRLBANK_ENABLE 0x27 30 #define LM3533_REG_BRIGHTNESS_BASE 0x40 31 32 33 static inline u8 lm3533_ctrlbank_get_reg(struct lm3533_ctrlbank *cb, u8 base) 34 { 35 return base + cb->id; 36 } 37 38 int lm3533_ctrlbank_enable(struct lm3533_ctrlbank *cb) 39 { 40 u8 mask; 41 int ret; 42 43 dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id); 44 45 mask = 1 << cb->id; 46 ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE, 47 mask, mask); 48 if (ret) 49 dev_err(cb->dev, "failed to enable ctrlbank %d\n", cb->id); 50 51 return ret; 52 } 53 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_enable); 54 55 int lm3533_ctrlbank_disable(struct lm3533_ctrlbank *cb) 56 { 57 u8 mask; 58 int ret; 59 60 dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id); 61 62 mask = 1 << cb->id; 63 ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE, 0, mask); 64 if (ret) 65 dev_err(cb->dev, "failed to disable ctrlbank %d\n", cb->id); 66 67 return ret; 68 } 69 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_disable); 70 71 /* 72 * Full-scale current. 73 * 74 * imax 5000 - 29800 uA (800 uA step) 75 */ 76 int lm3533_ctrlbank_set_max_current(struct lm3533_ctrlbank *cb, u16 imax) 77 { 78 u8 reg; 79 u8 val; 80 int ret; 81 82 if (imax < LM3533_MAX_CURRENT_MIN || imax > LM3533_MAX_CURRENT_MAX) 83 return -EINVAL; 84 85 val = (imax - LM3533_MAX_CURRENT_MIN) / LM3533_MAX_CURRENT_STEP; 86 87 reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_MAX_CURRENT_BASE); 88 ret = lm3533_write(cb->lm3533, reg, val); 89 if (ret) 90 dev_err(cb->dev, "failed to set max current\n"); 91 92 return ret; 93 } 94 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_max_current); 95 96 #define lm3533_ctrlbank_set(_name, _NAME) \ 97 int lm3533_ctrlbank_set_##_name(struct lm3533_ctrlbank *cb, u8 val) \ 98 { \ 99 u8 reg; \ 100 int ret; \ 101 \ 102 if (val > LM3533_##_NAME##_MAX) \ 103 return -EINVAL; \ 104 \ 105 reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_##_NAME##_BASE); \ 106 ret = lm3533_write(cb->lm3533, reg, val); \ 107 if (ret) \ 108 dev_err(cb->dev, "failed to set " #_name "\n"); \ 109 \ 110 return ret; \ 111 } \ 112 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_##_name); 113 114 #define lm3533_ctrlbank_get(_name, _NAME) \ 115 int lm3533_ctrlbank_get_##_name(struct lm3533_ctrlbank *cb, u8 *val) \ 116 { \ 117 u8 reg; \ 118 int ret; \ 119 \ 120 reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_##_NAME##_BASE); \ 121 ret = lm3533_read(cb->lm3533, reg, val); \ 122 if (ret) \ 123 dev_err(cb->dev, "failed to get " #_name "\n"); \ 124 \ 125 return ret; \ 126 } \ 127 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_##_name); 128 129 lm3533_ctrlbank_set(brightness, BRIGHTNESS); 130 lm3533_ctrlbank_get(brightness, BRIGHTNESS); 131 132 /* 133 * PWM-input control mask: 134 * 135 * bit 5 - PWM-input enabled in Zone 4 136 * bit 4 - PWM-input enabled in Zone 3 137 * bit 3 - PWM-input enabled in Zone 2 138 * bit 2 - PWM-input enabled in Zone 1 139 * bit 1 - PWM-input enabled in Zone 0 140 * bit 0 - PWM-input enabled 141 */ 142 lm3533_ctrlbank_set(pwm, PWM); 143 lm3533_ctrlbank_get(pwm, PWM); 144 145 146 MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>"); 147 MODULE_DESCRIPTION("LM3533 Control Bank interface"); 148 MODULE_LICENSE("GPL"); 149