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
33static inline u8 lm3533_ctrlbank_get_reg(struct lm3533_ctrlbank *cb, u8 base)
34{
35 return base + cb->id;
36}
37
38int 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}
53EXPORT_SYMBOL_GPL(lm3533_ctrlbank_enable);
54
55int 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}
69EXPORT_SYMBOL_GPL(lm3533_ctrlbank_disable);
70
71/*
72 * Full-scale current.
73 *
74 * imax 5000 - 29800 uA (800 uA step)
75 */
76int 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}
94EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_max_current);
95
96#define lm3533_ctrlbank_set(_name, _NAME) \
97int 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} \
112EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_##_name);
113
114#define lm3533_ctrlbank_get(_name, _NAME) \
115int 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} \
127EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_##_name);
128
129lm3533_ctrlbank_set(brightness, BRIGHTNESS);
130lm3533_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 */
142lm3533_ctrlbank_set(pwm, PWM);
143lm3533_ctrlbank_get(pwm, PWM);
144
145
146MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
147MODULE_DESCRIPTION("LM3533 Control Bank interface");
148MODULE_LICENSE("GPL");
149