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08ff6f2a HZ |
1 | /* |
2 | * Regulators driver for Maxim max8925 | |
3 | * | |
4 | * Copyright (C) 2009 Marvell International Ltd. | |
5 | * Haojian Zhuang <haojian.zhuang@marvell.com> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | */ | |
11 | #include <linux/kernel.h> | |
65602c32 | 12 | #include <linux/module.h> |
08ff6f2a HZ |
13 | #include <linux/init.h> |
14 | #include <linux/err.h> | |
15 | #include <linux/i2c.h> | |
16 | #include <linux/platform_device.h> | |
17 | #include <linux/regulator/driver.h> | |
18 | #include <linux/regulator/machine.h> | |
19 | #include <linux/mfd/max8925.h> | |
45b6f8e8 QX |
20 | #include <linux/of.h> |
21 | #include <linux/regulator/of_regulator.h> | |
08ff6f2a HZ |
22 | |
23 | #define SD1_DVM_VMIN 850000 | |
24 | #define SD1_DVM_VMAX 1000000 | |
25 | #define SD1_DVM_STEP 50000 | |
26 | #define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */ | |
27 | #define SD1_DVM_EN 6 /* SDV1 bit 6 */ | |
28 | ||
65364e9a KL |
29 | /* bit definitions in LDO control registers */ |
30 | #define LDO_SEQ_I2C 0x7 /* Power U/D by i2c */ | |
31 | #define LDO_SEQ_MASK 0x7 /* Power U/D sequence mask */ | |
32 | #define LDO_SEQ_SHIFT 2 /* Power U/D sequence offset */ | |
33 | #define LDO_I2C_EN 0x1 /* Enable by i2c */ | |
34 | #define LDO_I2C_EN_MASK 0x1 /* Enable mask by i2c */ | |
35 | #define LDO_I2C_EN_SHIFT 0 /* Enable offset by i2c */ | |
db13c040 | 36 | |
08ff6f2a HZ |
37 | struct max8925_regulator_info { |
38 | struct regulator_desc desc; | |
39 | struct regulator_dev *regulator; | |
40 | struct i2c_client *i2c; | |
41 | struct max8925_chip *chip; | |
42 | ||
08ff6f2a | 43 | int vol_reg; |
08ff6f2a HZ |
44 | int enable_reg; |
45 | }; | |
46 | ||
cd8318cb AL |
47 | static int max8925_set_voltage_sel(struct regulator_dev *rdev, |
48 | unsigned int selector) | |
08ff6f2a HZ |
49 | { |
50 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
cd8318cb | 51 | unsigned char mask = rdev->desc->n_voltages - 1; |
08ff6f2a | 52 | |
cd8318cb | 53 | return max8925_set_bits(info->i2c, info->vol_reg, mask, selector); |
08ff6f2a HZ |
54 | } |
55 | ||
3c8983b9 | 56 | static int max8925_get_voltage_sel(struct regulator_dev *rdev) |
08ff6f2a HZ |
57 | { |
58 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
59 | unsigned char data, mask; | |
60 | int ret; | |
61 | ||
62 | ret = max8925_reg_read(info->i2c, info->vol_reg); | |
63 | if (ret < 0) | |
64 | return ret; | |
7f52ba77 AL |
65 | mask = rdev->desc->n_voltages - 1; |
66 | data = ret & mask; | |
08ff6f2a | 67 | |
3c8983b9 | 68 | return data; |
08ff6f2a HZ |
69 | } |
70 | ||
71 | static int max8925_enable(struct regulator_dev *rdev) | |
72 | { | |
73 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
74 | ||
75 | return max8925_set_bits(info->i2c, info->enable_reg, | |
65364e9a KL |
76 | LDO_SEQ_MASK << LDO_SEQ_SHIFT | |
77 | LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, | |
78 | LDO_SEQ_I2C << LDO_SEQ_SHIFT | | |
79 | LDO_I2C_EN << LDO_I2C_EN_SHIFT); | |
08ff6f2a HZ |
80 | } |
81 | ||
82 | static int max8925_disable(struct regulator_dev *rdev) | |
83 | { | |
84 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
85 | ||
86 | return max8925_set_bits(info->i2c, info->enable_reg, | |
65364e9a KL |
87 | LDO_SEQ_MASK << LDO_SEQ_SHIFT | |
88 | LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, | |
89 | LDO_SEQ_I2C << LDO_SEQ_SHIFT); | |
08ff6f2a HZ |
90 | } |
91 | ||
92 | static int max8925_is_enabled(struct regulator_dev *rdev) | |
93 | { | |
94 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
65364e9a | 95 | int ldo_seq, ret; |
08ff6f2a | 96 | |
4b99fef0 | 97 | ret = max8925_reg_read(info->i2c, info->enable_reg); |
08ff6f2a HZ |
98 | if (ret < 0) |
99 | return ret; | |
65364e9a KL |
100 | ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK; |
101 | if (ldo_seq != LDO_SEQ_I2C) | |
102 | return 1; | |
103 | else | |
104 | return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT); | |
08ff6f2a HZ |
105 | } |
106 | ||
107 | static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV) | |
108 | { | |
109 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
110 | unsigned char data, mask; | |
111 | ||
112 | if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX) | |
113 | return -EINVAL; | |
114 | ||
5db6d09a | 115 | data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP); |
08ff6f2a HZ |
116 | data <<= SD1_DVM_SHIFT; |
117 | mask = 3 << SD1_DVM_SHIFT; | |
118 | ||
119 | return max8925_set_bits(info->i2c, info->enable_reg, mask, data); | |
120 | } | |
121 | ||
122 | static int max8925_set_dvm_enable(struct regulator_dev *rdev) | |
123 | { | |
124 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
125 | ||
126 | return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, | |
127 | 1 << SD1_DVM_EN); | |
128 | } | |
129 | ||
130 | static int max8925_set_dvm_disable(struct regulator_dev *rdev) | |
131 | { | |
132 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
133 | ||
134 | return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0); | |
135 | } | |
136 | ||
137 | static struct regulator_ops max8925_regulator_sdv_ops = { | |
cd8318cb | 138 | .map_voltage = regulator_map_voltage_linear, |
4093e739 | 139 | .list_voltage = regulator_list_voltage_linear, |
cd8318cb | 140 | .set_voltage_sel = max8925_set_voltage_sel, |
3c8983b9 | 141 | .get_voltage_sel = max8925_get_voltage_sel, |
08ff6f2a HZ |
142 | .enable = max8925_enable, |
143 | .disable = max8925_disable, | |
144 | .is_enabled = max8925_is_enabled, | |
145 | .set_suspend_voltage = max8925_set_dvm_voltage, | |
146 | .set_suspend_enable = max8925_set_dvm_enable, | |
147 | .set_suspend_disable = max8925_set_dvm_disable, | |
148 | }; | |
149 | ||
150 | static struct regulator_ops max8925_regulator_ldo_ops = { | |
cd8318cb | 151 | .map_voltage = regulator_map_voltage_linear, |
4093e739 | 152 | .list_voltage = regulator_list_voltage_linear, |
cd8318cb | 153 | .set_voltage_sel = max8925_set_voltage_sel, |
3c8983b9 | 154 | .get_voltage_sel = max8925_get_voltage_sel, |
08ff6f2a HZ |
155 | .enable = max8925_enable, |
156 | .disable = max8925_disable, | |
157 | .is_enabled = max8925_is_enabled, | |
158 | }; | |
159 | ||
160 | #define MAX8925_SDV(_id, min, max, step) \ | |
161 | { \ | |
162 | .desc = { \ | |
163 | .name = "SDV" #_id, \ | |
164 | .ops = &max8925_regulator_sdv_ops, \ | |
165 | .type = REGULATOR_VOLTAGE, \ | |
166 | .id = MAX8925_ID_SD##_id, \ | |
167 | .owner = THIS_MODULE, \ | |
7f52ba77 | 168 | .n_voltages = 64, \ |
4093e739 AL |
169 | .min_uV = min * 1000, \ |
170 | .uV_step = step * 1000, \ | |
08ff6f2a | 171 | }, \ |
08ff6f2a | 172 | .vol_reg = MAX8925_SDV##_id, \ |
08ff6f2a | 173 | .enable_reg = MAX8925_SDCTL##_id, \ |
08ff6f2a HZ |
174 | } |
175 | ||
176 | #define MAX8925_LDO(_id, min, max, step) \ | |
177 | { \ | |
178 | .desc = { \ | |
179 | .name = "LDO" #_id, \ | |
180 | .ops = &max8925_regulator_ldo_ops, \ | |
181 | .type = REGULATOR_VOLTAGE, \ | |
182 | .id = MAX8925_ID_LDO##_id, \ | |
183 | .owner = THIS_MODULE, \ | |
7f52ba77 | 184 | .n_voltages = 64, \ |
4093e739 AL |
185 | .min_uV = min * 1000, \ |
186 | .uV_step = step * 1000, \ | |
08ff6f2a | 187 | }, \ |
08ff6f2a | 188 | .vol_reg = MAX8925_LDOVOUT##_id, \ |
08ff6f2a | 189 | .enable_reg = MAX8925_LDOCTL##_id, \ |
08ff6f2a HZ |
190 | } |
191 | ||
45b6f8e8 QX |
192 | #ifdef CONFIG_OF |
193 | static struct of_regulator_match max8925_regulator_matches[] = { | |
194 | { .name = "SDV1",}, | |
195 | { .name = "SDV2",}, | |
196 | { .name = "SDV3",}, | |
197 | { .name = "LDO1",}, | |
198 | { .name = "LDO2",}, | |
199 | { .name = "LDO3",}, | |
200 | { .name = "LDO4",}, | |
201 | { .name = "LDO5",}, | |
202 | { .name = "LDO6",}, | |
203 | { .name = "LDO7",}, | |
204 | { .name = "LDO8",}, | |
205 | { .name = "LDO9",}, | |
206 | { .name = "LDO10",}, | |
207 | { .name = "LDO11",}, | |
208 | { .name = "LDO12",}, | |
209 | { .name = "LDO13",}, | |
210 | { .name = "LDO14",}, | |
211 | { .name = "LDO15",}, | |
212 | { .name = "LDO16",}, | |
213 | { .name = "LDO17",}, | |
214 | { .name = "LDO18",}, | |
215 | { .name = "LDO19",}, | |
216 | { .name = "LDO20",}, | |
217 | }; | |
218 | #endif | |
219 | ||
08ff6f2a HZ |
220 | static struct max8925_regulator_info max8925_regulator_info[] = { |
221 | MAX8925_SDV(1, 637.5, 1425, 12.5), | |
222 | MAX8925_SDV(2, 650, 2225, 25), | |
223 | MAX8925_SDV(3, 750, 3900, 50), | |
224 | ||
225 | MAX8925_LDO(1, 750, 3900, 50), | |
226 | MAX8925_LDO(2, 650, 2250, 25), | |
227 | MAX8925_LDO(3, 650, 2250, 25), | |
228 | MAX8925_LDO(4, 750, 3900, 50), | |
229 | MAX8925_LDO(5, 750, 3900, 50), | |
230 | MAX8925_LDO(6, 750, 3900, 50), | |
231 | MAX8925_LDO(7, 750, 3900, 50), | |
232 | MAX8925_LDO(8, 750, 3900, 50), | |
233 | MAX8925_LDO(9, 750, 3900, 50), | |
234 | MAX8925_LDO(10, 750, 3900, 50), | |
235 | MAX8925_LDO(11, 750, 3900, 50), | |
236 | MAX8925_LDO(12, 750, 3900, 50), | |
237 | MAX8925_LDO(13, 750, 3900, 50), | |
238 | MAX8925_LDO(14, 750, 3900, 50), | |
239 | MAX8925_LDO(15, 750, 3900, 50), | |
240 | MAX8925_LDO(16, 750, 3900, 50), | |
241 | MAX8925_LDO(17, 650, 2250, 25), | |
242 | MAX8925_LDO(18, 650, 2250, 25), | |
243 | MAX8925_LDO(19, 750, 3900, 50), | |
244 | MAX8925_LDO(20, 750, 3900, 50), | |
245 | }; | |
246 | ||
45b6f8e8 QX |
247 | #ifdef CONFIG_OF |
248 | static int max8925_regulator_dt_init(struct platform_device *pdev, | |
45b6f8e8 QX |
249 | struct regulator_config *config, |
250 | int ridx) | |
251 | { | |
252 | struct device_node *nproot, *np; | |
253 | int rcount; | |
c92f5dd2 | 254 | nproot = of_node_get(pdev->dev.parent->of_node); |
45b6f8e8 QX |
255 | if (!nproot) |
256 | return -ENODEV; | |
257 | np = of_find_node_by_name(nproot, "regulators"); | |
258 | if (!np) { | |
259 | dev_err(&pdev->dev, "failed to find regulators node\n"); | |
260 | return -ENODEV; | |
261 | } | |
262 | ||
263 | rcount = of_regulator_match(&pdev->dev, np, | |
264 | &max8925_regulator_matches[ridx], 1); | |
c92f5dd2 | 265 | of_node_put(np); |
45b6f8e8 QX |
266 | if (rcount < 0) |
267 | return -ENODEV; | |
268 | config->init_data = max8925_regulator_matches[ridx].init_data; | |
269 | config->of_node = max8925_regulator_matches[ridx].of_node; | |
270 | ||
271 | return 0; | |
272 | } | |
273 | #else | |
ad4928f1 | 274 | #define max8925_regulator_dt_init(x, y, z) (-1) |
45b6f8e8 QX |
275 | #endif |
276 | ||
a5023574 | 277 | static int max8925_regulator_probe(struct platform_device *pdev) |
08ff6f2a HZ |
278 | { |
279 | struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); | |
51acdb61 | 280 | struct regulator_init_data *pdata = pdev->dev.platform_data; |
c172708d | 281 | struct regulator_config config = { }; |
3fff6c04 | 282 | struct max8925_regulator_info *ri; |
51acdb61 | 283 | struct resource *res; |
08ff6f2a | 284 | struct regulator_dev *rdev; |
45b6f8e8 | 285 | int i, regulator_idx; |
08ff6f2a | 286 | |
51acdb61 HZ |
287 | res = platform_get_resource(pdev, IORESOURCE_REG, 0); |
288 | if (!res) { | |
289 | dev_err(&pdev->dev, "No REG resource!\n"); | |
290 | return -EINVAL; | |
291 | } | |
292 | for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { | |
293 | ri = &max8925_regulator_info[i]; | |
45b6f8e8 QX |
294 | if (ri->vol_reg == res->start) { |
295 | regulator_idx = i; | |
51acdb61 | 296 | break; |
45b6f8e8 | 297 | } |
51acdb61 | 298 | } |
45b6f8e8 | 299 | |
51acdb61 HZ |
300 | if (i == ARRAY_SIZE(max8925_regulator_info)) { |
301 | dev_err(&pdev->dev, "Failed to find regulator %llu\n", | |
302 | (unsigned long long)res->start); | |
08ff6f2a HZ |
303 | return -EINVAL; |
304 | } | |
305 | ri->i2c = chip->i2c; | |
306 | ri->chip = chip; | |
307 | ||
c172708d | 308 | config.dev = &pdev->dev; |
c172708d MB |
309 | config.driver_data = ri; |
310 | ||
ad4928f1 | 311 | if (max8925_regulator_dt_init(pdev, &config, regulator_idx)) |
45b6f8e8 QX |
312 | if (pdata) |
313 | config.init_data = pdata; | |
314 | ||
c172708d | 315 | rdev = regulator_register(&ri->desc, &config); |
08ff6f2a HZ |
316 | if (IS_ERR(rdev)) { |
317 | dev_err(&pdev->dev, "failed to register regulator %s\n", | |
318 | ri->desc.name); | |
319 | return PTR_ERR(rdev); | |
320 | } | |
321 | ||
322 | platform_set_drvdata(pdev, rdev); | |
323 | return 0; | |
324 | } | |
325 | ||
8dc995f5 | 326 | static int max8925_regulator_remove(struct platform_device *pdev) |
08ff6f2a HZ |
327 | { |
328 | struct regulator_dev *rdev = platform_get_drvdata(pdev); | |
329 | ||
3fff6c04 | 330 | platform_set_drvdata(pdev, NULL); |
08ff6f2a | 331 | regulator_unregister(rdev); |
3fff6c04 | 332 | |
08ff6f2a HZ |
333 | return 0; |
334 | } | |
335 | ||
336 | static struct platform_driver max8925_regulator_driver = { | |
337 | .driver = { | |
338 | .name = "max8925-regulator", | |
339 | .owner = THIS_MODULE, | |
340 | }, | |
341 | .probe = max8925_regulator_probe, | |
5eb9f2b9 | 342 | .remove = max8925_regulator_remove, |
08ff6f2a HZ |
343 | }; |
344 | ||
345 | static int __init max8925_regulator_init(void) | |
346 | { | |
347 | return platform_driver_register(&max8925_regulator_driver); | |
348 | } | |
349 | subsys_initcall(max8925_regulator_init); | |
350 | ||
351 | static void __exit max8925_regulator_exit(void) | |
352 | { | |
353 | platform_driver_unregister(&max8925_regulator_driver); | |
354 | } | |
355 | module_exit(max8925_regulator_exit); | |
356 | ||
357 | MODULE_LICENSE("GPL"); | |
358 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); | |
359 | MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); | |
360 | MODULE_ALIAS("platform:max8925-regulator"); |