1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * PCAP2 Regulator Driver
4  *
5  * Copyright (c) 2009 Daniel Ribeiro <drwyrm@gmail.com>
6  */
7 
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/err.h>
12 #include <linux/platform_device.h>
13 #include <linux/regulator/driver.h>
14 #include <linux/regulator/machine.h>
15 #include <linux/mfd/ezx-pcap.h>
16 
17 static const unsigned int V1_table[] = {
18 	2775000, 1275000, 1600000, 1725000, 1825000, 1925000, 2075000, 2275000,
19 };
20 
21 static const unsigned int V2_table[] = {
22 	2500000, 2775000,
23 };
24 
25 static const unsigned int V3_table[] = {
26 	1075000, 1275000, 1550000, 1725000, 1876000, 1950000, 2075000, 2275000,
27 };
28 
29 static const unsigned int V4_table[] = {
30 	1275000, 1550000, 1725000, 1875000, 1950000, 2075000, 2275000, 2775000,
31 };
32 
33 static const unsigned int V5_table[] = {
34 	1875000, 2275000, 2475000, 2775000,
35 };
36 
37 static const unsigned int V6_table[] = {
38 	2475000, 2775000,
39 };
40 
41 static const unsigned int V7_table[] = {
42 	1875000, 2775000,
43 };
44 
45 #define V8_table V4_table
46 
47 static const unsigned int V9_table[] = {
48 	1575000, 1875000, 2475000, 2775000,
49 };
50 
51 static const unsigned int V10_table[] = {
52 	5000000,
53 };
54 
55 static const unsigned int VAUX1_table[] = {
56 	1875000, 2475000, 2775000, 3000000,
57 };
58 
59 #define VAUX2_table VAUX1_table
60 
61 static const unsigned int VAUX3_table[] = {
62 	1200000, 1200000, 1200000, 1200000, 1400000, 1600000, 1800000, 2000000,
63 	2200000, 2400000, 2600000, 2800000, 3000000, 3200000, 3400000, 3600000,
64 };
65 
66 static const unsigned int VAUX4_table[] = {
67 	1800000, 1800000, 3000000, 5000000,
68 };
69 
70 static const unsigned int VSIM_table[] = {
71 	1875000, 3000000,
72 };
73 
74 static const unsigned int VSIM2_table[] = {
75 	1875000,
76 };
77 
78 static const unsigned int VVIB_table[] = {
79 	1300000, 1800000, 2000000, 3000000,
80 };
81 
82 static const unsigned int SW1_table[] = {
83 	 900000,  950000, 1000000, 1050000, 1100000, 1150000, 1200000, 1250000,
84 	1300000, 1350000, 1400000, 1450000, 1500000, 1600000, 1875000, 2250000,
85 };
86 
87 #define SW2_table SW1_table
88 
89 struct pcap_regulator {
90 	const u8 reg;
91 	const u8 en;
92 	const u8 index;
93 	const u8 stby;
94 	const u8 lowpwr;
95 };
96 
97 #define NA 0xff
98 
99 #define VREG_INFO(_vreg, _reg, _en, _index, _stby, _lowpwr)		\
100 	[_vreg]	= {							\
101 		.reg		= _reg,					\
102 		.en		= _en,					\
103 		.index		= _index,				\
104 		.stby		= _stby,				\
105 		.lowpwr		= _lowpwr,				\
106 	}
107 
108 static struct pcap_regulator vreg_table[] = {
109 	VREG_INFO(V1,    PCAP_REG_VREG1,   1,  2,  18, 0),
110 	VREG_INFO(V2,    PCAP_REG_VREG1,   5,  6,  19, 22),
111 	VREG_INFO(V3,    PCAP_REG_VREG1,   7,  8,  20, 23),
112 	VREG_INFO(V4,    PCAP_REG_VREG1,   11, 12, 21, 24),
113 	/* V5 STBY and LOWPWR are on PCAP_REG_VREG2 */
114 	VREG_INFO(V5,    PCAP_REG_VREG1,   15, 16, 12, 19),
115 
116 	VREG_INFO(V6,    PCAP_REG_VREG2,   1,  2,  14, 20),
117 	VREG_INFO(V7,    PCAP_REG_VREG2,   3,  4,  15, 21),
118 	VREG_INFO(V8,    PCAP_REG_VREG2,   5,  6,  16, 22),
119 	VREG_INFO(V9,    PCAP_REG_VREG2,   9,  10, 17, 23),
120 	VREG_INFO(V10,   PCAP_REG_VREG2,   10, NA, 18, 24),
121 
122 	VREG_INFO(VAUX1, PCAP_REG_AUXVREG, 1,  2,  22, 23),
123 	/* VAUX2 ... VSIM2 STBY and LOWPWR are on PCAP_REG_LOWPWR */
124 	VREG_INFO(VAUX2, PCAP_REG_AUXVREG, 4,  5,  0,  1),
125 	VREG_INFO(VAUX3, PCAP_REG_AUXVREG, 7,  8,  2,  3),
126 	VREG_INFO(VAUX4, PCAP_REG_AUXVREG, 12, 13, 4,  5),
127 	VREG_INFO(VSIM,  PCAP_REG_AUXVREG, 17, 18, NA, 6),
128 	VREG_INFO(VSIM2, PCAP_REG_AUXVREG, 16, NA, NA, 7),
129 	VREG_INFO(VVIB,  PCAP_REG_AUXVREG, 19, 20, NA, NA),
130 
131 	VREG_INFO(SW1,   PCAP_REG_SWCTRL,  1,  2,  NA, NA),
132 	VREG_INFO(SW2,   PCAP_REG_SWCTRL,  6,  7,  NA, NA),
133 	/* SW3 STBY is on PCAP_REG_AUXVREG */
134 	VREG_INFO(SW3,   PCAP_REG_SWCTRL,  11, 12, 24, NA),
135 
136 	/* SWxS used to control SWx voltage on standby */
137 /*	VREG_INFO(SW1S,  PCAP_REG_LOWPWR,  NA, 12, NA, NA),
138 	VREG_INFO(SW2S,  PCAP_REG_LOWPWR,  NA, 20, NA, NA), */
139 };
140 
141 static int pcap_regulator_set_voltage_sel(struct regulator_dev *rdev,
142 					  unsigned selector)
143 {
144 	struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
145 	void *pcap = rdev_get_drvdata(rdev);
146 
147 	/* the regulator doesn't support voltage switching */
148 	if (rdev->desc->n_voltages == 1)
149 		return -EINVAL;
150 
151 	return ezx_pcap_set_bits(pcap, vreg->reg,
152 				 (rdev->desc->n_voltages - 1) << vreg->index,
153 				 selector << vreg->index);
154 }
155 
156 static int pcap_regulator_get_voltage_sel(struct regulator_dev *rdev)
157 {
158 	struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
159 	void *pcap = rdev_get_drvdata(rdev);
160 	u32 tmp;
161 
162 	if (rdev->desc->n_voltages == 1)
163 		return 0;
164 
165 	ezx_pcap_read(pcap, vreg->reg, &tmp);
166 	tmp = ((tmp >> vreg->index) & (rdev->desc->n_voltages - 1));
167 	return tmp;
168 }
169 
170 static int pcap_regulator_enable(struct regulator_dev *rdev)
171 {
172 	struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
173 	void *pcap = rdev_get_drvdata(rdev);
174 
175 	if (vreg->en == NA)
176 		return -EINVAL;
177 
178 	return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 1 << vreg->en);
179 }
180 
181 static int pcap_regulator_disable(struct regulator_dev *rdev)
182 {
183 	struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
184 	void *pcap = rdev_get_drvdata(rdev);
185 
186 	if (vreg->en == NA)
187 		return -EINVAL;
188 
189 	return ezx_pcap_set_bits(pcap, vreg->reg, 1 << vreg->en, 0);
190 }
191 
192 static int pcap_regulator_is_enabled(struct regulator_dev *rdev)
193 {
194 	struct pcap_regulator *vreg = &vreg_table[rdev_get_id(rdev)];
195 	void *pcap = rdev_get_drvdata(rdev);
196 	u32 tmp;
197 
198 	if (vreg->en == NA)
199 		return -EINVAL;
200 
201 	ezx_pcap_read(pcap, vreg->reg, &tmp);
202 	return (tmp >> vreg->en) & 1;
203 }
204 
205 static const struct regulator_ops pcap_regulator_ops = {
206 	.list_voltage	= regulator_list_voltage_table,
207 	.set_voltage_sel = pcap_regulator_set_voltage_sel,
208 	.get_voltage_sel = pcap_regulator_get_voltage_sel,
209 	.enable		= pcap_regulator_enable,
210 	.disable	= pcap_regulator_disable,
211 	.is_enabled	= pcap_regulator_is_enabled,
212 };
213 
214 #define VREG(_vreg)						\
215 	[_vreg]	= {						\
216 		.name		= #_vreg,			\
217 		.id		= _vreg,			\
218 		.n_voltages	= ARRAY_SIZE(_vreg##_table),	\
219 		.volt_table	= _vreg##_table,		\
220 		.ops		= &pcap_regulator_ops,		\
221 		.type		= REGULATOR_VOLTAGE,		\
222 		.owner		= THIS_MODULE,			\
223 	}
224 
225 static const struct regulator_desc pcap_regulators[] = {
226 	VREG(V1), VREG(V2), VREG(V3), VREG(V4), VREG(V5), VREG(V6), VREG(V7),
227 	VREG(V8), VREG(V9), VREG(V10), VREG(VAUX1), VREG(VAUX2), VREG(VAUX3),
228 	VREG(VAUX4), VREG(VSIM), VREG(VSIM2), VREG(VVIB), VREG(SW1), VREG(SW2),
229 };
230 
231 static int pcap_regulator_probe(struct platform_device *pdev)
232 {
233 	struct regulator_dev *rdev;
234 	void *pcap = dev_get_drvdata(pdev->dev.parent);
235 	struct regulator_config config = { };
236 
237 	config.dev = &pdev->dev;
238 	config.init_data = dev_get_platdata(&pdev->dev);
239 	config.driver_data = pcap;
240 
241 	rdev = devm_regulator_register(&pdev->dev, &pcap_regulators[pdev->id],
242 				       &config);
243 	if (IS_ERR(rdev))
244 		return PTR_ERR(rdev);
245 
246 	platform_set_drvdata(pdev, rdev);
247 
248 	return 0;
249 }
250 
251 static struct platform_driver pcap_regulator_driver = {
252 	.driver = {
253 		.name	= "pcap-regulator",
254 	},
255 	.probe	= pcap_regulator_probe,
256 };
257 
258 static int __init pcap_regulator_init(void)
259 {
260 	return platform_driver_register(&pcap_regulator_driver);
261 }
262 
263 static void __exit pcap_regulator_exit(void)
264 {
265 	platform_driver_unregister(&pcap_regulator_driver);
266 }
267 
268 subsys_initcall(pcap_regulator_init);
269 module_exit(pcap_regulator_exit);
270 
271 MODULE_AUTHOR("Daniel Ribeiro <drwyrm@gmail.com>");
272 MODULE_DESCRIPTION("PCAP2 Regulator Driver");
273 MODULE_LICENSE("GPL");
274