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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 |
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