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