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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> |
12 | #include <linux/module.h> |
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> |
20 | #include <linux/of.h> |
21 | #include <linux/regulator/of_regulator.h> |
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 | |
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 */ |
36 | |
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 | |
43 | int vol_reg; |
44 | int enable_reg; |
45 | }; |
46 | |
47 | static int max8925_set_voltage_sel(struct regulator_dev *rdev, |
48 | unsigned int selector) |
49 | { |
50 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); |
51 | unsigned char mask = rdev->desc->n_voltages - 1; |
52 | |
53 | return max8925_set_bits(info->i2c, info->vol_reg, mask, selector); |
54 | } |
55 | |
56 | static int max8925_get_voltage_sel(struct regulator_dev *rdev) |
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; |
65 | mask = rdev->desc->n_voltages - 1; |
66 | data = ret & mask; |
67 | |
68 | return data; |
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, |
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); |
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, |
87 | LDO_SEQ_MASK << LDO_SEQ_SHIFT | |
88 | LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, |
89 | LDO_SEQ_I2C << LDO_SEQ_SHIFT); |
90 | } |
91 | |
92 | static int max8925_is_enabled(struct regulator_dev *rdev) |
93 | { |
94 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); |
95 | int ldo_seq, ret; |
96 | |
97 | ret = max8925_reg_read(info->i2c, info->enable_reg); |
98 | if (ret < 0) |
99 | return ret; |
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); |
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 | |
115 | data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP); |
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 = { |
138 | .map_voltage = regulator_map_voltage_linear, |
139 | .list_voltage = regulator_list_voltage_linear, |
140 | .set_voltage_sel = max8925_set_voltage_sel, |
141 | .get_voltage_sel = max8925_get_voltage_sel, |
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 = { |
151 | .map_voltage = regulator_map_voltage_linear, |
152 | .list_voltage = regulator_list_voltage_linear, |
153 | .set_voltage_sel = max8925_set_voltage_sel, |
154 | .get_voltage_sel = max8925_get_voltage_sel, |
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, \ |
168 | .n_voltages = 64, \ |
169 | .min_uV = min * 1000, \ |
170 | .uV_step = step * 1000, \ |
171 | }, \ |
172 | .vol_reg = MAX8925_SDV##_id, \ |
173 | .enable_reg = MAX8925_SDCTL##_id, \ |
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, \ |
184 | .n_voltages = 64, \ |
185 | .min_uV = min * 1000, \ |
186 | .uV_step = step * 1000, \ |
187 | }, \ |
188 | .vol_reg = MAX8925_LDOVOUT##_id, \ |
189 | .enable_reg = MAX8925_LDOCTL##_id, \ |
190 | } |
191 | |
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 | |
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 | |
247 | #ifdef CONFIG_OF |
248 | static int max8925_regulator_dt_init(struct platform_device *pdev, |
249 | struct max8925_regulator_info *info, |
250 | struct regulator_config *config, |
251 | int ridx) |
252 | { |
253 | struct device_node *nproot, *np; |
254 | int rcount; |
255 | nproot = of_node_get(pdev->dev.parent->of_node); |
256 | if (!nproot) |
257 | return -ENODEV; |
258 | np = of_find_node_by_name(nproot, "regulators"); |
259 | if (!np) { |
260 | dev_err(&pdev->dev, "failed to find regulators node\n"); |
261 | return -ENODEV; |
262 | } |
263 | |
264 | rcount = of_regulator_match(&pdev->dev, np, |
265 | &max8925_regulator_matches[ridx], 1); |
266 | of_node_put(np); |
267 | if (rcount < 0) |
268 | return -ENODEV; |
269 | config->init_data = max8925_regulator_matches[ridx].init_data; |
270 | config->of_node = max8925_regulator_matches[ridx].of_node; |
271 | |
272 | return 0; |
273 | } |
274 | #else |
275 | #define max8925_regulator_dt_init(w, x, y, z) (-1) |
276 | #endif |
277 | |
278 | static int max8925_regulator_probe(struct platform_device *pdev) |
279 | { |
280 | struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); |
281 | struct regulator_init_data *pdata = pdev->dev.platform_data; |
282 | struct regulator_config config = { }; |
283 | struct max8925_regulator_info *ri; |
284 | struct resource *res; |
285 | struct regulator_dev *rdev; |
286 | int i, regulator_idx; |
287 | |
288 | res = platform_get_resource(pdev, IORESOURCE_REG, 0); |
289 | if (!res) { |
290 | dev_err(&pdev->dev, "No REG resource!\n"); |
291 | return -EINVAL; |
292 | } |
293 | for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { |
294 | ri = &max8925_regulator_info[i]; |
295 | if (ri->vol_reg == res->start) { |
296 | regulator_idx = i; |
297 | break; |
298 | } |
299 | } |
300 | |
301 | if (i == ARRAY_SIZE(max8925_regulator_info)) { |
302 | dev_err(&pdev->dev, "Failed to find regulator %llu\n", |
303 | (unsigned long long)res->start); |
304 | return -EINVAL; |
305 | } |
306 | ri->i2c = chip->i2c; |
307 | ri->chip = chip; |
308 | |
309 | config.dev = &pdev->dev; |
310 | config.driver_data = ri; |
311 | |
312 | if (max8925_regulator_dt_init(pdev, ri, &config, regulator_idx)) |
313 | if (pdata) |
314 | config.init_data = pdata; |
315 | |
316 | rdev = regulator_register(&ri->desc, &config); |
317 | if (IS_ERR(rdev)) { |
318 | dev_err(&pdev->dev, "failed to register regulator %s\n", |
319 | ri->desc.name); |
320 | return PTR_ERR(rdev); |
321 | } |
322 | |
323 | platform_set_drvdata(pdev, rdev); |
324 | return 0; |
325 | } |
326 | |
327 | static int max8925_regulator_remove(struct platform_device *pdev) |
328 | { |
329 | struct regulator_dev *rdev = platform_get_drvdata(pdev); |
330 | |
331 | platform_set_drvdata(pdev, NULL); |
332 | regulator_unregister(rdev); |
333 | |
334 | return 0; |
335 | } |
336 | |
337 | static struct platform_driver max8925_regulator_driver = { |
338 | .driver = { |
339 | .name = "max8925-regulator", |
340 | .owner = THIS_MODULE, |
341 | }, |
342 | .probe = max8925_regulator_probe, |
343 | .remove = max8925_regulator_remove, |
344 | }; |
345 | |
346 | static int __init max8925_regulator_init(void) |
347 | { |
348 | return platform_driver_register(&max8925_regulator_driver); |
349 | } |
350 | subsys_initcall(max8925_regulator_init); |
351 | |
352 | static void __exit max8925_regulator_exit(void) |
353 | { |
354 | platform_driver_unregister(&max8925_regulator_driver); |
355 | } |
356 | module_exit(max8925_regulator_exit); |
357 | |
358 | MODULE_LICENSE("GPL"); |
359 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); |
360 | MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); |
361 | MODULE_ALIAS("platform:max8925-regulator"); |
362 |
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