diff options
Diffstat (limited to 'drivers/mfd/lm3533-ctrlbank.c')
-rw-r--r-- | drivers/mfd/lm3533-ctrlbank.c | 148 |
1 files changed, 148 insertions, 0 deletions
diff --git a/drivers/mfd/lm3533-ctrlbank.c b/drivers/mfd/lm3533-ctrlbank.c new file mode 100644 index 000000000000..a4cb7a5220a7 --- /dev/null +++ b/drivers/mfd/lm3533-ctrlbank.c | |||
@@ -0,0 +1,148 @@ | |||
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"); | ||