drm/etnaviv: Implement mmap as GEM object function
[linux-2.6-microblaze.git] / drivers / mfd / lm3533-ctrlbank.c
1 // SPDX-License-Identifier: GPL-2.0-or-later
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>
8  */
9
10 #include <linux/device.h>
11 #include <linux/module.h>
12
13 #include <linux/mfd/lm3533.h>
14
15
16 #define LM3533_MAX_CURRENT_MIN          5000
17 #define LM3533_MAX_CURRENT_MAX          29800
18 #define LM3533_MAX_CURRENT_STEP         800
19
20 #define LM3533_PWM_MAX                  0x3f
21
22 #define LM3533_REG_PWM_BASE             0x14
23 #define LM3533_REG_MAX_CURRENT_BASE     0x1f
24 #define LM3533_REG_CTRLBANK_ENABLE      0x27
25 #define LM3533_REG_BRIGHTNESS_BASE      0x40
26
27
28 static inline u8 lm3533_ctrlbank_get_reg(struct lm3533_ctrlbank *cb, u8 base)
29 {
30         return base + cb->id;
31 }
32
33 int lm3533_ctrlbank_enable(struct lm3533_ctrlbank *cb)
34 {
35         u8 mask;
36         int ret;
37
38         dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
39
40         mask = 1 << cb->id;
41         ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE,
42                                                                 mask, mask);
43         if (ret)
44                 dev_err(cb->dev, "failed to enable ctrlbank %d\n", cb->id);
45
46         return ret;
47 }
48 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_enable);
49
50 int lm3533_ctrlbank_disable(struct lm3533_ctrlbank *cb)
51 {
52         u8 mask;
53         int ret;
54
55         dev_dbg(cb->dev, "%s - %d\n", __func__, cb->id);
56
57         mask = 1 << cb->id;
58         ret = lm3533_update(cb->lm3533, LM3533_REG_CTRLBANK_ENABLE, 0, mask);
59         if (ret)
60                 dev_err(cb->dev, "failed to disable ctrlbank %d\n", cb->id);
61
62         return ret;
63 }
64 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_disable);
65
66 /*
67  * Full-scale current.
68  *
69  * imax         5000 - 29800 uA (800 uA step)
70  */
71 int lm3533_ctrlbank_set_max_current(struct lm3533_ctrlbank *cb, u16 imax)
72 {
73         u8 reg;
74         u8 val;
75         int ret;
76
77         if (imax < LM3533_MAX_CURRENT_MIN || imax > LM3533_MAX_CURRENT_MAX)
78                 return -EINVAL;
79
80         val = (imax - LM3533_MAX_CURRENT_MIN) / LM3533_MAX_CURRENT_STEP;
81
82         reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_MAX_CURRENT_BASE);
83         ret = lm3533_write(cb->lm3533, reg, val);
84         if (ret)
85                 dev_err(cb->dev, "failed to set max current\n");
86
87         return ret;
88 }
89 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_max_current);
90
91 int lm3533_ctrlbank_set_brightness(struct lm3533_ctrlbank *cb, u8 val)
92 {
93         u8 reg;
94         int ret;
95
96         reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_BRIGHTNESS_BASE);
97         ret = lm3533_write(cb->lm3533, reg, val);
98         if (ret)
99                 dev_err(cb->dev, "failed to set brightness\n");
100
101         return ret;
102 }
103 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_brightness);
104
105 int lm3533_ctrlbank_get_brightness(struct lm3533_ctrlbank *cb, u8 *val)
106 {
107         u8 reg;
108         int ret;
109
110         reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_BRIGHTNESS_BASE);
111         ret = lm3533_read(cb->lm3533, reg, val);
112         if (ret)
113                 dev_err(cb->dev, "failed to get brightness\n");
114
115         return ret;
116 }
117 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_brightness);
118
119 /*
120  * PWM-input control mask:
121  *
122  *   bit 5 - PWM-input enabled in Zone 4
123  *   bit 4 - PWM-input enabled in Zone 3
124  *   bit 3 - PWM-input enabled in Zone 2
125  *   bit 2 - PWM-input enabled in Zone 1
126  *   bit 1 - PWM-input enabled in Zone 0
127  *   bit 0 - PWM-input enabled
128  */
129 int lm3533_ctrlbank_set_pwm(struct lm3533_ctrlbank *cb, u8 val)
130 {
131         u8 reg;
132         int ret;
133
134         if (val > LM3533_PWM_MAX)
135                 return -EINVAL;
136
137         reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_PWM_BASE);
138         ret = lm3533_write(cb->lm3533, reg, val);
139         if (ret)
140                 dev_err(cb->dev, "failed to set PWM mask\n");
141
142         return ret;
143 }
144 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_set_pwm);
145
146 int lm3533_ctrlbank_get_pwm(struct lm3533_ctrlbank *cb, u8 *val)
147 {
148         u8 reg;
149         int ret;
150
151         reg = lm3533_ctrlbank_get_reg(cb, LM3533_REG_PWM_BASE);
152         ret = lm3533_read(cb->lm3533, reg, val);
153         if (ret)
154                 dev_err(cb->dev, "failed to get PWM mask\n");
155
156         return ret;
157 }
158 EXPORT_SYMBOL_GPL(lm3533_ctrlbank_get_pwm);
159
160 MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
161 MODULE_DESCRIPTION("LM3533 Control Bank interface");
162 MODULE_LICENSE("GPL");