1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Regulators driver for Maxim max8925
4 *
5 * Copyright (C) 2009 Marvell International Ltd.
6 * Haojian Zhuang <haojian.zhuang@marvell.com>
7 */
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/init.h>
11 #include <linux/err.h>
12 #include <linux/i2c.h>
13 #include <linux/platform_device.h>
14 #include <linux/regulator/driver.h>
15 #include <linux/regulator/machine.h>
16 #include <linux/mfd/max8925.h>
17 #include <linux/of.h>
18 #include <linux/regulator/of_regulator.h>
19
20 #define SD1_DVM_VMIN 850000
21 #define SD1_DVM_VMAX 1000000
22 #define SD1_DVM_STEP 50000
23 #define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */
24 #define SD1_DVM_EN 6 /* SDV1 bit 6 */
25
26 /* bit definitions in LDO control registers */
27 #define LDO_SEQ_I2C 0x7 /* Power U/D by i2c */
28 #define LDO_SEQ_MASK 0x7 /* Power U/D sequence mask */
29 #define LDO_SEQ_SHIFT 2 /* Power U/D sequence offset */
30 #define LDO_I2C_EN 0x1 /* Enable by i2c */
31 #define LDO_I2C_EN_MASK 0x1 /* Enable mask by i2c */
32 #define LDO_I2C_EN_SHIFT 0 /* Enable offset by i2c */
33
34 struct max8925_regulator_info {
35 struct regulator_desc desc;
36 struct i2c_client *i2c;
37
38 int vol_reg;
39 int enable_reg;
40 };
41
max8925_set_voltage_sel(struct regulator_dev * rdev,unsigned int selector)42 static int max8925_set_voltage_sel(struct regulator_dev *rdev,
43 unsigned int selector)
44 {
45 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
46 unsigned char mask = rdev->desc->n_voltages - 1;
47
48 return max8925_set_bits(info->i2c, info->vol_reg, mask, selector);
49 }
50
max8925_get_voltage_sel(struct regulator_dev * rdev)51 static int max8925_get_voltage_sel(struct regulator_dev *rdev)
52 {
53 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
54 unsigned char data, mask;
55 int ret;
56
57 ret = max8925_reg_read(info->i2c, info->vol_reg);
58 if (ret < 0)
59 return ret;
60 mask = rdev->desc->n_voltages - 1;
61 data = ret & mask;
62
63 return data;
64 }
65
max8925_enable(struct regulator_dev * rdev)66 static int max8925_enable(struct regulator_dev *rdev)
67 {
68 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
69
70 return max8925_set_bits(info->i2c, info->enable_reg,
71 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
72 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
73 LDO_SEQ_I2C << LDO_SEQ_SHIFT |
74 LDO_I2C_EN << LDO_I2C_EN_SHIFT);
75 }
76
max8925_disable(struct regulator_dev * rdev)77 static int max8925_disable(struct regulator_dev *rdev)
78 {
79 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
80
81 return max8925_set_bits(info->i2c, info->enable_reg,
82 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
83 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
84 LDO_SEQ_I2C << LDO_SEQ_SHIFT);
85 }
86
max8925_is_enabled(struct regulator_dev * rdev)87 static int max8925_is_enabled(struct regulator_dev *rdev)
88 {
89 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
90 int ldo_seq, ret;
91
92 ret = max8925_reg_read(info->i2c, info->enable_reg);
93 if (ret < 0)
94 return ret;
95 ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK;
96 if (ldo_seq != LDO_SEQ_I2C)
97 return 1;
98 else
99 return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT);
100 }
101
max8925_set_dvm_voltage(struct regulator_dev * rdev,int uV)102 static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV)
103 {
104 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
105 unsigned char data, mask;
106
107 if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX)
108 return -EINVAL;
109
110 data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP);
111 data <<= SD1_DVM_SHIFT;
112 mask = 3 << SD1_DVM_SHIFT;
113
114 return max8925_set_bits(info->i2c, info->enable_reg, mask, data);
115 }
116
max8925_set_dvm_enable(struct regulator_dev * rdev)117 static int max8925_set_dvm_enable(struct regulator_dev *rdev)
118 {
119 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
120
121 return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN,
122 1 << SD1_DVM_EN);
123 }
124
max8925_set_dvm_disable(struct regulator_dev * rdev)125 static int max8925_set_dvm_disable(struct regulator_dev *rdev)
126 {
127 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
128
129 return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0);
130 }
131
132 static const struct regulator_ops max8925_regulator_sdv_ops = {
133 .map_voltage = regulator_map_voltage_linear,
134 .list_voltage = regulator_list_voltage_linear,
135 .set_voltage_sel = max8925_set_voltage_sel,
136 .get_voltage_sel = max8925_get_voltage_sel,
137 .enable = max8925_enable,
138 .disable = max8925_disable,
139 .is_enabled = max8925_is_enabled,
140 .set_suspend_voltage = max8925_set_dvm_voltage,
141 .set_suspend_enable = max8925_set_dvm_enable,
142 .set_suspend_disable = max8925_set_dvm_disable,
143 };
144
145 static const struct regulator_ops max8925_regulator_ldo_ops = {
146 .map_voltage = regulator_map_voltage_linear,
147 .list_voltage = regulator_list_voltage_linear,
148 .set_voltage_sel = max8925_set_voltage_sel,
149 .get_voltage_sel = max8925_get_voltage_sel,
150 .enable = max8925_enable,
151 .disable = max8925_disable,
152 .is_enabled = max8925_is_enabled,
153 };
154
155 #define MAX8925_SDV(_id, min, max, step) \
156 { \
157 .desc = { \
158 .name = "SDV" #_id, \
159 .of_match = of_match_ptr("SDV" #_id), \
160 .regulators_node = of_match_ptr("regulators"), \
161 .ops = &max8925_regulator_sdv_ops, \
162 .type = REGULATOR_VOLTAGE, \
163 .id = MAX8925_ID_SD##_id, \
164 .owner = THIS_MODULE, \
165 .n_voltages = 64, \
166 .min_uV = min * 1000, \
167 .uV_step = step * 1000, \
168 }, \
169 .vol_reg = MAX8925_SDV##_id, \
170 .enable_reg = MAX8925_SDCTL##_id, \
171 }
172
173 #define MAX8925_LDO(_id, min, max, step) \
174 { \
175 .desc = { \
176 .name = "LDO" #_id, \
177 .of_match = of_match_ptr("LDO" #_id), \
178 .regulators_node = of_match_ptr("regulators"), \
179 .ops = &max8925_regulator_ldo_ops, \
180 .type = REGULATOR_VOLTAGE, \
181 .id = MAX8925_ID_LDO##_id, \
182 .owner = THIS_MODULE, \
183 .n_voltages = 64, \
184 .min_uV = min * 1000, \
185 .uV_step = step * 1000, \
186 }, \
187 .vol_reg = MAX8925_LDOVOUT##_id, \
188 .enable_reg = MAX8925_LDOCTL##_id, \
189 }
190
191 static struct max8925_regulator_info max8925_regulator_info[] = {
192 MAX8925_SDV(1, 637.5, 1425, 12.5),
193 MAX8925_SDV(2, 650, 2225, 25),
194 MAX8925_SDV(3, 750, 3900, 50),
195
196 MAX8925_LDO(1, 750, 3900, 50),
197 MAX8925_LDO(2, 650, 2250, 25),
198 MAX8925_LDO(3, 650, 2250, 25),
199 MAX8925_LDO(4, 750, 3900, 50),
200 MAX8925_LDO(5, 750, 3900, 50),
201 MAX8925_LDO(6, 750, 3900, 50),
202 MAX8925_LDO(7, 750, 3900, 50),
203 MAX8925_LDO(8, 750, 3900, 50),
204 MAX8925_LDO(9, 750, 3900, 50),
205 MAX8925_LDO(10, 750, 3900, 50),
206 MAX8925_LDO(11, 750, 3900, 50),
207 MAX8925_LDO(12, 750, 3900, 50),
208 MAX8925_LDO(13, 750, 3900, 50),
209 MAX8925_LDO(14, 750, 3900, 50),
210 MAX8925_LDO(15, 750, 3900, 50),
211 MAX8925_LDO(16, 750, 3900, 50),
212 MAX8925_LDO(17, 650, 2250, 25),
213 MAX8925_LDO(18, 650, 2250, 25),
214 MAX8925_LDO(19, 750, 3900, 50),
215 MAX8925_LDO(20, 750, 3900, 50),
216 };
217
max8925_regulator_probe(struct platform_device * pdev)218 static int max8925_regulator_probe(struct platform_device *pdev)
219 {
220 struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
221 struct regulator_init_data *pdata = dev_get_platdata(&pdev->dev);
222 struct regulator_config config = { };
223 struct max8925_regulator_info *ri;
224 struct resource *res;
225 struct regulator_dev *rdev;
226 int i;
227
228 res = platform_get_resource(pdev, IORESOURCE_REG, 0);
229 if (!res) {
230 dev_err(&pdev->dev, "No REG resource!\n");
231 return -EINVAL;
232 }
233 for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
234 ri = &max8925_regulator_info[i];
235 if (ri->vol_reg == res->start)
236 break;
237 }
238
239 if (i == ARRAY_SIZE(max8925_regulator_info)) {
240 dev_err(&pdev->dev, "Failed to find regulator %llu\n",
241 (unsigned long long)res->start);
242 return -EINVAL;
243 }
244 ri->i2c = chip->i2c;
245
246 config.dev = chip->dev;
247 config.driver_data = ri;
248
249 if (pdata)
250 config.init_data = pdata;
251
252 rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
253 if (IS_ERR(rdev)) {
254 dev_err(&pdev->dev, "failed to register regulator %s\n",
255 ri->desc.name);
256 return PTR_ERR(rdev);
257 }
258
259 platform_set_drvdata(pdev, rdev);
260 return 0;
261 }
262
263 static struct platform_driver max8925_regulator_driver = {
264 .driver = {
265 .name = "max8925-regulator",
266 },
267 .probe = max8925_regulator_probe,
268 };
269
max8925_regulator_init(void)270 static int __init max8925_regulator_init(void)
271 {
272 return platform_driver_register(&max8925_regulator_driver);
273 }
274 subsys_initcall(max8925_regulator_init);
275
max8925_regulator_exit(void)276 static void __exit max8925_regulator_exit(void)
277 {
278 platform_driver_unregister(&max8925_regulator_driver);
279 }
280 module_exit(max8925_regulator_exit);
281
282 MODULE_LICENSE("GPL");
283 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
284 MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
285 MODULE_ALIAS("platform:max8925-regulator");
286