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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; | |
08ff6f2a | 39 | struct i2c_client *i2c; |
08ff6f2a | 40 | |
08ff6f2a | 41 | int vol_reg; |
08ff6f2a HZ |
42 | int enable_reg; |
43 | }; | |
44 | ||
cd8318cb AL |
45 | static int max8925_set_voltage_sel(struct regulator_dev *rdev, |
46 | unsigned int selector) | |
08ff6f2a HZ |
47 | { |
48 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
cd8318cb | 49 | unsigned char mask = rdev->desc->n_voltages - 1; |
08ff6f2a | 50 | |
cd8318cb | 51 | return max8925_set_bits(info->i2c, info->vol_reg, mask, selector); |
08ff6f2a HZ |
52 | } |
53 | ||
3c8983b9 | 54 | static int max8925_get_voltage_sel(struct regulator_dev *rdev) |
08ff6f2a HZ |
55 | { |
56 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
57 | unsigned char data, mask; | |
58 | int ret; | |
59 | ||
60 | ret = max8925_reg_read(info->i2c, info->vol_reg); | |
61 | if (ret < 0) | |
62 | return ret; | |
7f52ba77 AL |
63 | mask = rdev->desc->n_voltages - 1; |
64 | data = ret & mask; | |
08ff6f2a | 65 | |
3c8983b9 | 66 | return data; |
08ff6f2a HZ |
67 | } |
68 | ||
69 | static int max8925_enable(struct regulator_dev *rdev) | |
70 | { | |
71 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
72 | ||
73 | return max8925_set_bits(info->i2c, info->enable_reg, | |
65364e9a KL |
74 | LDO_SEQ_MASK << LDO_SEQ_SHIFT | |
75 | LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, | |
76 | LDO_SEQ_I2C << LDO_SEQ_SHIFT | | |
77 | LDO_I2C_EN << LDO_I2C_EN_SHIFT); | |
08ff6f2a HZ |
78 | } |
79 | ||
80 | static int max8925_disable(struct regulator_dev *rdev) | |
81 | { | |
82 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
83 | ||
84 | return max8925_set_bits(info->i2c, info->enable_reg, | |
65364e9a KL |
85 | LDO_SEQ_MASK << LDO_SEQ_SHIFT | |
86 | LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, | |
87 | LDO_SEQ_I2C << LDO_SEQ_SHIFT); | |
08ff6f2a HZ |
88 | } |
89 | ||
90 | static int max8925_is_enabled(struct regulator_dev *rdev) | |
91 | { | |
92 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
65364e9a | 93 | int ldo_seq, ret; |
08ff6f2a | 94 | |
4b99fef0 | 95 | ret = max8925_reg_read(info->i2c, info->enable_reg); |
08ff6f2a HZ |
96 | if (ret < 0) |
97 | return ret; | |
65364e9a KL |
98 | ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK; |
99 | if (ldo_seq != LDO_SEQ_I2C) | |
100 | return 1; | |
101 | else | |
102 | return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT); | |
08ff6f2a HZ |
103 | } |
104 | ||
105 | static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV) | |
106 | { | |
107 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
108 | unsigned char data, mask; | |
109 | ||
110 | if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX) | |
111 | return -EINVAL; | |
112 | ||
5db6d09a | 113 | data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP); |
08ff6f2a HZ |
114 | data <<= SD1_DVM_SHIFT; |
115 | mask = 3 << SD1_DVM_SHIFT; | |
116 | ||
117 | return max8925_set_bits(info->i2c, info->enable_reg, mask, data); | |
118 | } | |
119 | ||
120 | static int max8925_set_dvm_enable(struct regulator_dev *rdev) | |
121 | { | |
122 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
123 | ||
124 | return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, | |
125 | 1 << SD1_DVM_EN); | |
126 | } | |
127 | ||
128 | static int max8925_set_dvm_disable(struct regulator_dev *rdev) | |
129 | { | |
130 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
131 | ||
132 | return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0); | |
133 | } | |
134 | ||
85214c9a | 135 | static const struct regulator_ops max8925_regulator_sdv_ops = { |
cd8318cb | 136 | .map_voltage = regulator_map_voltage_linear, |
4093e739 | 137 | .list_voltage = regulator_list_voltage_linear, |
cd8318cb | 138 | .set_voltage_sel = max8925_set_voltage_sel, |
3c8983b9 | 139 | .get_voltage_sel = max8925_get_voltage_sel, |
08ff6f2a HZ |
140 | .enable = max8925_enable, |
141 | .disable = max8925_disable, | |
142 | .is_enabled = max8925_is_enabled, | |
143 | .set_suspend_voltage = max8925_set_dvm_voltage, | |
144 | .set_suspend_enable = max8925_set_dvm_enable, | |
145 | .set_suspend_disable = max8925_set_dvm_disable, | |
146 | }; | |
147 | ||
85214c9a | 148 | static const struct regulator_ops max8925_regulator_ldo_ops = { |
cd8318cb | 149 | .map_voltage = regulator_map_voltage_linear, |
4093e739 | 150 | .list_voltage = regulator_list_voltage_linear, |
cd8318cb | 151 | .set_voltage_sel = max8925_set_voltage_sel, |
3c8983b9 | 152 | .get_voltage_sel = max8925_get_voltage_sel, |
08ff6f2a HZ |
153 | .enable = max8925_enable, |
154 | .disable = max8925_disable, | |
155 | .is_enabled = max8925_is_enabled, | |
156 | }; | |
157 | ||
158 | #define MAX8925_SDV(_id, min, max, step) \ | |
159 | { \ | |
160 | .desc = { \ | |
161 | .name = "SDV" #_id, \ | |
162 | .ops = &max8925_regulator_sdv_ops, \ | |
163 | .type = REGULATOR_VOLTAGE, \ | |
164 | .id = MAX8925_ID_SD##_id, \ | |
165 | .owner = THIS_MODULE, \ | |
7f52ba77 | 166 | .n_voltages = 64, \ |
4093e739 AL |
167 | .min_uV = min * 1000, \ |
168 | .uV_step = step * 1000, \ | |
08ff6f2a | 169 | }, \ |
08ff6f2a | 170 | .vol_reg = MAX8925_SDV##_id, \ |
08ff6f2a | 171 | .enable_reg = MAX8925_SDCTL##_id, \ |
08ff6f2a HZ |
172 | } |
173 | ||
174 | #define MAX8925_LDO(_id, min, max, step) \ | |
175 | { \ | |
176 | .desc = { \ | |
177 | .name = "LDO" #_id, \ | |
178 | .ops = &max8925_regulator_ldo_ops, \ | |
179 | .type = REGULATOR_VOLTAGE, \ | |
180 | .id = MAX8925_ID_LDO##_id, \ | |
181 | .owner = THIS_MODULE, \ | |
7f52ba77 | 182 | .n_voltages = 64, \ |
4093e739 AL |
183 | .min_uV = min * 1000, \ |
184 | .uV_step = step * 1000, \ | |
08ff6f2a | 185 | }, \ |
08ff6f2a | 186 | .vol_reg = MAX8925_LDOVOUT##_id, \ |
08ff6f2a | 187 | .enable_reg = MAX8925_LDOCTL##_id, \ |
08ff6f2a HZ |
188 | } |
189 | ||
45b6f8e8 QX |
190 | #ifdef CONFIG_OF |
191 | static struct of_regulator_match max8925_regulator_matches[] = { | |
192 | { .name = "SDV1",}, | |
193 | { .name = "SDV2",}, | |
194 | { .name = "SDV3",}, | |
195 | { .name = "LDO1",}, | |
196 | { .name = "LDO2",}, | |
197 | { .name = "LDO3",}, | |
198 | { .name = "LDO4",}, | |
199 | { .name = "LDO5",}, | |
200 | { .name = "LDO6",}, | |
201 | { .name = "LDO7",}, | |
202 | { .name = "LDO8",}, | |
203 | { .name = "LDO9",}, | |
204 | { .name = "LDO10",}, | |
205 | { .name = "LDO11",}, | |
206 | { .name = "LDO12",}, | |
207 | { .name = "LDO13",}, | |
208 | { .name = "LDO14",}, | |
209 | { .name = "LDO15",}, | |
210 | { .name = "LDO16",}, | |
211 | { .name = "LDO17",}, | |
212 | { .name = "LDO18",}, | |
213 | { .name = "LDO19",}, | |
214 | { .name = "LDO20",}, | |
215 | }; | |
216 | #endif | |
217 | ||
08ff6f2a HZ |
218 | static struct max8925_regulator_info max8925_regulator_info[] = { |
219 | MAX8925_SDV(1, 637.5, 1425, 12.5), | |
220 | MAX8925_SDV(2, 650, 2225, 25), | |
221 | MAX8925_SDV(3, 750, 3900, 50), | |
222 | ||
223 | MAX8925_LDO(1, 750, 3900, 50), | |
224 | MAX8925_LDO(2, 650, 2250, 25), | |
225 | MAX8925_LDO(3, 650, 2250, 25), | |
226 | MAX8925_LDO(4, 750, 3900, 50), | |
227 | MAX8925_LDO(5, 750, 3900, 50), | |
228 | MAX8925_LDO(6, 750, 3900, 50), | |
229 | MAX8925_LDO(7, 750, 3900, 50), | |
230 | MAX8925_LDO(8, 750, 3900, 50), | |
231 | MAX8925_LDO(9, 750, 3900, 50), | |
232 | MAX8925_LDO(10, 750, 3900, 50), | |
233 | MAX8925_LDO(11, 750, 3900, 50), | |
234 | MAX8925_LDO(12, 750, 3900, 50), | |
235 | MAX8925_LDO(13, 750, 3900, 50), | |
236 | MAX8925_LDO(14, 750, 3900, 50), | |
237 | MAX8925_LDO(15, 750, 3900, 50), | |
238 | MAX8925_LDO(16, 750, 3900, 50), | |
239 | MAX8925_LDO(17, 650, 2250, 25), | |
240 | MAX8925_LDO(18, 650, 2250, 25), | |
241 | MAX8925_LDO(19, 750, 3900, 50), | |
242 | MAX8925_LDO(20, 750, 3900, 50), | |
243 | }; | |
244 | ||
45b6f8e8 QX |
245 | #ifdef CONFIG_OF |
246 | static int max8925_regulator_dt_init(struct platform_device *pdev, | |
45b6f8e8 QX |
247 | struct regulator_config *config, |
248 | int ridx) | |
249 | { | |
250 | struct device_node *nproot, *np; | |
251 | int rcount; | |
c74c76e8 | 252 | |
b8b27a44 | 253 | nproot = pdev->dev.parent->of_node; |
45b6f8e8 QX |
254 | if (!nproot) |
255 | return -ENODEV; | |
1f4f88c0 | 256 | np = of_get_child_by_name(nproot, "regulators"); |
45b6f8e8 QX |
257 | if (!np) { |
258 | dev_err(&pdev->dev, "failed to find regulators node\n"); | |
259 | return -ENODEV; | |
260 | } | |
261 | ||
262 | rcount = of_regulator_match(&pdev->dev, np, | |
263 | &max8925_regulator_matches[ridx], 1); | |
c92f5dd2 | 264 | of_node_put(np); |
45b6f8e8 | 265 | if (rcount < 0) |
e9fa1a3a | 266 | return rcount; |
45b6f8e8 QX |
267 | config->init_data = max8925_regulator_matches[ridx].init_data; |
268 | config->of_node = max8925_regulator_matches[ridx].of_node; | |
269 | ||
270 | return 0; | |
271 | } | |
272 | #else | |
ad4928f1 | 273 | #define max8925_regulator_dt_init(x, y, z) (-1) |
45b6f8e8 QX |
274 | #endif |
275 | ||
a5023574 | 276 | static int max8925_regulator_probe(struct platform_device *pdev) |
08ff6f2a HZ |
277 | { |
278 | struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); | |
dff91d0b | 279 | struct regulator_init_data *pdata = dev_get_platdata(&pdev->dev); |
c172708d | 280 | struct regulator_config config = { }; |
3fff6c04 | 281 | struct max8925_regulator_info *ri; |
51acdb61 | 282 | struct resource *res; |
08ff6f2a | 283 | struct regulator_dev *rdev; |
45b6f8e8 | 284 | int i, regulator_idx; |
08ff6f2a | 285 | |
51acdb61 HZ |
286 | res = platform_get_resource(pdev, IORESOURCE_REG, 0); |
287 | if (!res) { | |
288 | dev_err(&pdev->dev, "No REG resource!\n"); | |
289 | return -EINVAL; | |
290 | } | |
291 | for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { | |
292 | ri = &max8925_regulator_info[i]; | |
45b6f8e8 QX |
293 | if (ri->vol_reg == res->start) { |
294 | regulator_idx = i; | |
51acdb61 | 295 | break; |
45b6f8e8 | 296 | } |
51acdb61 | 297 | } |
45b6f8e8 | 298 | |
51acdb61 HZ |
299 | if (i == ARRAY_SIZE(max8925_regulator_info)) { |
300 | dev_err(&pdev->dev, "Failed to find regulator %llu\n", | |
301 | (unsigned long long)res->start); | |
08ff6f2a HZ |
302 | return -EINVAL; |
303 | } | |
304 | ri->i2c = chip->i2c; | |
08ff6f2a | 305 | |
c172708d | 306 | config.dev = &pdev->dev; |
c172708d MB |
307 | config.driver_data = ri; |
308 | ||
ad4928f1 | 309 | if (max8925_regulator_dt_init(pdev, &config, regulator_idx)) |
45b6f8e8 QX |
310 | if (pdata) |
311 | config.init_data = pdata; | |
312 | ||
58765e24 | 313 | rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config); |
08ff6f2a HZ |
314 | if (IS_ERR(rdev)) { |
315 | dev_err(&pdev->dev, "failed to register regulator %s\n", | |
316 | ri->desc.name); | |
317 | return PTR_ERR(rdev); | |
318 | } | |
319 | ||
320 | platform_set_drvdata(pdev, rdev); | |
321 | return 0; | |
322 | } | |
323 | ||
08ff6f2a HZ |
324 | static struct platform_driver max8925_regulator_driver = { |
325 | .driver = { | |
326 | .name = "max8925-regulator", | |
08ff6f2a HZ |
327 | }, |
328 | .probe = max8925_regulator_probe, | |
08ff6f2a HZ |
329 | }; |
330 | ||
331 | static int __init max8925_regulator_init(void) | |
332 | { | |
333 | return platform_driver_register(&max8925_regulator_driver); | |
334 | } | |
335 | subsys_initcall(max8925_regulator_init); | |
336 | ||
337 | static void __exit max8925_regulator_exit(void) | |
338 | { | |
339 | platform_driver_unregister(&max8925_regulator_driver); | |
340 | } | |
341 | module_exit(max8925_regulator_exit); | |
342 | ||
343 | MODULE_LICENSE("GPL"); | |
344 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); | |
345 | MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); | |
346 | MODULE_ALIAS("platform:max8925-regulator"); |