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16c5c023 JH |
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 | ||
6fa4b9d8 JH |
20 | #define LM3533_MAX_CURRENT_MIN 5000 |
21 | #define LM3533_MAX_CURRENT_MAX 29800 | |
22 | #define LM3533_MAX_CURRENT_STEP 800 | |
23 | ||
16c5c023 | 24 | #define LM3533_BRIGHTNESS_MAX 255 |
16c5c023 JH |
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 | ||
6fa4b9d8 JH |
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 | ||
16c5c023 JH |
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 | ||
16c5c023 JH |
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"); |