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
pcap_regulator_set_voltage_sel(struct regulator_dev * rdev,unsigned selector)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
pcap_regulator_get_voltage_sel(struct regulator_dev * rdev)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
pcap_regulator_enable(struct regulator_dev * rdev)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
pcap_regulator_disable(struct regulator_dev * rdev)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
pcap_regulator_is_enabled(struct regulator_dev * rdev)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
pcap_regulator_probe(struct platform_device * pdev)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 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
255 },
256 .probe = pcap_regulator_probe,
257 };
258
pcap_regulator_init(void)259 static int __init pcap_regulator_init(void)
260 {
261 return platform_driver_register(&pcap_regulator_driver);
262 }
263
pcap_regulator_exit(void)264 static void __exit pcap_regulator_exit(void)
265 {
266 platform_driver_unregister(&pcap_regulator_driver);
267 }
268
269 subsys_initcall(pcap_regulator_init);
270 module_exit(pcap_regulator_exit);
271
272 MODULE_AUTHOR("Daniel Ribeiro <drwyrm@gmail.com>");
273 MODULE_DESCRIPTION("PCAP2 Regulator Driver");
274 MODULE_LICENSE("GPL");
275