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d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
08ff6f2a HZ |
2 | /* |
3 | * Regulators driver for Maxim max8925 | |
4 | * | |
5 | * Copyright (C) 2009 Marvell International Ltd. | |
6 | * Haojian Zhuang <haojian.zhuang@marvell.com> | |
08ff6f2a HZ |
7 | */ |
8 | #include <linux/kernel.h> | |
65602c32 | 9 | #include <linux/module.h> |
08ff6f2a HZ |
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> | |
45b6f8e8 QX |
17 | #include <linux/of.h> |
18 | #include <linux/regulator/of_regulator.h> | |
08ff6f2a HZ |
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 | ||
65364e9a KL |
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 */ | |
db13c040 | 33 | |
08ff6f2a HZ |
34 | struct max8925_regulator_info { |
35 | struct regulator_desc desc; | |
08ff6f2a | 36 | struct i2c_client *i2c; |
08ff6f2a | 37 | |
08ff6f2a | 38 | int vol_reg; |
08ff6f2a HZ |
39 | int enable_reg; |
40 | }; | |
41 | ||
cd8318cb AL |
42 | static int max8925_set_voltage_sel(struct regulator_dev *rdev, |
43 | unsigned int selector) | |
08ff6f2a HZ |
44 | { |
45 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
cd8318cb | 46 | unsigned char mask = rdev->desc->n_voltages - 1; |
08ff6f2a | 47 | |
cd8318cb | 48 | return max8925_set_bits(info->i2c, info->vol_reg, mask, selector); |
08ff6f2a HZ |
49 | } |
50 | ||
3c8983b9 | 51 | static int max8925_get_voltage_sel(struct regulator_dev *rdev) |
08ff6f2a HZ |
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; | |
7f52ba77 AL |
60 | mask = rdev->desc->n_voltages - 1; |
61 | data = ret & mask; | |
08ff6f2a | 62 | |
3c8983b9 | 63 | return data; |
08ff6f2a HZ |
64 | } |
65 | ||
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, | |
65364e9a KL |
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); | |
08ff6f2a HZ |
75 | } |
76 | ||
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, | |
65364e9a KL |
82 | LDO_SEQ_MASK << LDO_SEQ_SHIFT | |
83 | LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, | |
84 | LDO_SEQ_I2C << LDO_SEQ_SHIFT); | |
08ff6f2a HZ |
85 | } |
86 | ||
87 | static int max8925_is_enabled(struct regulator_dev *rdev) | |
88 | { | |
89 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
65364e9a | 90 | int ldo_seq, ret; |
08ff6f2a | 91 | |
4b99fef0 | 92 | ret = max8925_reg_read(info->i2c, info->enable_reg); |
08ff6f2a HZ |
93 | if (ret < 0) |
94 | return ret; | |
65364e9a KL |
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); | |
08ff6f2a HZ |
100 | } |
101 | ||
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 | ||
5db6d09a | 110 | data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP); |
08ff6f2a HZ |
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 | ||
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 | ||
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 | ||
85214c9a | 132 | static const struct regulator_ops max8925_regulator_sdv_ops = { |
cd8318cb | 133 | .map_voltage = regulator_map_voltage_linear, |
4093e739 | 134 | .list_voltage = regulator_list_voltage_linear, |
cd8318cb | 135 | .set_voltage_sel = max8925_set_voltage_sel, |
3c8983b9 | 136 | .get_voltage_sel = max8925_get_voltage_sel, |
08ff6f2a HZ |
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 | ||
85214c9a | 145 | static const struct regulator_ops max8925_regulator_ldo_ops = { |
cd8318cb | 146 | .map_voltage = regulator_map_voltage_linear, |
4093e739 | 147 | .list_voltage = regulator_list_voltage_linear, |
cd8318cb | 148 | .set_voltage_sel = max8925_set_voltage_sel, |
3c8983b9 | 149 | .get_voltage_sel = max8925_get_voltage_sel, |
08ff6f2a HZ |
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, \ | |
6185de50 AL |
159 | .of_match = of_match_ptr("SDV" #_id), \ |
160 | .regulators_node = of_match_ptr("regulators"), \ | |
08ff6f2a HZ |
161 | .ops = &max8925_regulator_sdv_ops, \ |
162 | .type = REGULATOR_VOLTAGE, \ | |
163 | .id = MAX8925_ID_SD##_id, \ | |
164 | .owner = THIS_MODULE, \ | |
7f52ba77 | 165 | .n_voltages = 64, \ |
4093e739 AL |
166 | .min_uV = min * 1000, \ |
167 | .uV_step = step * 1000, \ | |
08ff6f2a | 168 | }, \ |
08ff6f2a | 169 | .vol_reg = MAX8925_SDV##_id, \ |
08ff6f2a | 170 | .enable_reg = MAX8925_SDCTL##_id, \ |
08ff6f2a HZ |
171 | } |
172 | ||
173 | #define MAX8925_LDO(_id, min, max, step) \ | |
174 | { \ | |
175 | .desc = { \ | |
176 | .name = "LDO" #_id, \ | |
6185de50 AL |
177 | .of_match = of_match_ptr("LDO" #_id), \ |
178 | .regulators_node = of_match_ptr("regulators"), \ | |
08ff6f2a HZ |
179 | .ops = &max8925_regulator_ldo_ops, \ |
180 | .type = REGULATOR_VOLTAGE, \ | |
181 | .id = MAX8925_ID_LDO##_id, \ | |
182 | .owner = THIS_MODULE, \ | |
7f52ba77 | 183 | .n_voltages = 64, \ |
4093e739 AL |
184 | .min_uV = min * 1000, \ |
185 | .uV_step = step * 1000, \ | |
08ff6f2a | 186 | }, \ |
08ff6f2a | 187 | .vol_reg = MAX8925_LDOVOUT##_id, \ |
08ff6f2a | 188 | .enable_reg = MAX8925_LDOCTL##_id, \ |
08ff6f2a HZ |
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 | ||
a5023574 | 218 | static int max8925_regulator_probe(struct platform_device *pdev) |
08ff6f2a HZ |
219 | { |
220 | struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); | |
dff91d0b | 221 | struct regulator_init_data *pdata = dev_get_platdata(&pdev->dev); |
c172708d | 222 | struct regulator_config config = { }; |
3fff6c04 | 223 | struct max8925_regulator_info *ri; |
51acdb61 | 224 | struct resource *res; |
08ff6f2a | 225 | struct regulator_dev *rdev; |
6185de50 | 226 | int i; |
08ff6f2a | 227 | |
51acdb61 HZ |
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]; | |
6185de50 | 235 | if (ri->vol_reg == res->start) |
51acdb61 HZ |
236 | break; |
237 | } | |
45b6f8e8 | 238 | |
51acdb61 HZ |
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); | |
08ff6f2a HZ |
242 | return -EINVAL; |
243 | } | |
244 | ri->i2c = chip->i2c; | |
08ff6f2a | 245 | |
6185de50 | 246 | config.dev = chip->dev; |
c172708d MB |
247 | config.driver_data = ri; |
248 | ||
6185de50 AL |
249 | if (pdata) |
250 | config.init_data = pdata; | |
45b6f8e8 | 251 | |
58765e24 | 252 | rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config); |
08ff6f2a HZ |
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 | ||
08ff6f2a HZ |
263 | static struct platform_driver max8925_regulator_driver = { |
264 | .driver = { | |
265 | .name = "max8925-regulator", | |
259b93b2 | 266 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
08ff6f2a HZ |
267 | }, |
268 | .probe = max8925_regulator_probe, | |
08ff6f2a HZ |
269 | }; |
270 | ||
271 | static int __init max8925_regulator_init(void) | |
272 | { | |
273 | return platform_driver_register(&max8925_regulator_driver); | |
274 | } | |
275 | subsys_initcall(max8925_regulator_init); | |
276 | ||
277 | static void __exit max8925_regulator_exit(void) | |
278 | { | |
279 | platform_driver_unregister(&max8925_regulator_driver); | |
280 | } | |
281 | module_exit(max8925_regulator_exit); | |
282 | ||
283 | MODULE_LICENSE("GPL"); | |
284 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); | |
285 | MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); | |
286 | MODULE_ALIAS("platform:max8925-regulator"); |