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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
16c5c023 JH |
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> | |
16c5c023 JH |
8 | */ |
9 | ||
10 | #include <linux/device.h> | |
11 | #include <linux/module.h> | |
12 | ||
13 | #include <linux/mfd/lm3533.h> | |
14 | ||
15 | ||
6fa4b9d8 JH |
16 | #define LM3533_MAX_CURRENT_MIN 5000 |
17 | #define LM3533_MAX_CURRENT_MAX 29800 | |
18 | #define LM3533_MAX_CURRENT_STEP 800 | |
19 | ||
16c5c023 | 20 | #define LM3533_BRIGHTNESS_MAX 255 |
16c5c023 JH |
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 | ||
6fa4b9d8 JH |
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 | ||
16c5c023 JH |
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 | ||
16c5c023 JH |
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"); |