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
lm3533_ctrlbank_get_reg(struct lm3533_ctrlbank * cb,u8 base)28 static inline u8 lm3533_ctrlbank_get_reg(struct lm3533_ctrlbank *cb, u8 base)
29 {
30 return base + cb->id;
31 }
32
lm3533_ctrlbank_enable(struct lm3533_ctrlbank * cb)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
lm3533_ctrlbank_disable(struct lm3533_ctrlbank * cb)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 */
lm3533_ctrlbank_set_max_current(struct lm3533_ctrlbank * cb,u16 imax)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
lm3533_ctrlbank_set_brightness(struct lm3533_ctrlbank * cb,u8 val)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
lm3533_ctrlbank_get_brightness(struct lm3533_ctrlbank * cb,u8 * val)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 */
lm3533_ctrlbank_set_pwm(struct lm3533_ctrlbank * cb,u8 val)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
lm3533_ctrlbank_get_pwm(struct lm3533_ctrlbank * cb,u8 * val)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");
163