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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> | |
20 | ||
21 | #define SD1_DVM_VMIN 850000 | |
22 | #define SD1_DVM_VMAX 1000000 | |
23 | #define SD1_DVM_STEP 50000 | |
24 | #define SD1_DVM_SHIFT 5 /* SDCTL1 bit5 */ | |
25 | #define SD1_DVM_EN 6 /* SDV1 bit 6 */ | |
26 | ||
65364e9a KL |
27 | /* bit definitions in LDO control registers */ |
28 | #define LDO_SEQ_I2C 0x7 /* Power U/D by i2c */ | |
29 | #define LDO_SEQ_MASK 0x7 /* Power U/D sequence mask */ | |
30 | #define LDO_SEQ_SHIFT 2 /* Power U/D sequence offset */ | |
31 | #define LDO_I2C_EN 0x1 /* Enable by i2c */ | |
32 | #define LDO_I2C_EN_MASK 0x1 /* Enable mask by i2c */ | |
33 | #define LDO_I2C_EN_SHIFT 0 /* Enable offset by i2c */ | |
db13c040 | 34 | |
08ff6f2a HZ |
35 | struct max8925_regulator_info { |
36 | struct regulator_desc desc; | |
37 | struct regulator_dev *regulator; | |
38 | struct i2c_client *i2c; | |
39 | struct max8925_chip *chip; | |
40 | ||
41 | int min_uV; | |
42 | int max_uV; | |
43 | int step_uV; | |
44 | int vol_reg; | |
08ff6f2a HZ |
45 | int enable_reg; |
46 | }; | |
47 | ||
48 | static inline int check_range(struct max8925_regulator_info *info, | |
49 | int min_uV, int max_uV) | |
50 | { | |
51 | if (min_uV < info->min_uV || min_uV > info->max_uV) | |
52 | return -EINVAL; | |
53 | ||
54 | return 0; | |
55 | } | |
56 | ||
57 | static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index) | |
58 | { | |
59 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
60 | return info->min_uV + index * info->step_uV; | |
61 | } | |
62 | ||
63 | static int max8925_set_voltage(struct regulator_dev *rdev, | |
3a93f2a9 | 64 | int min_uV, int max_uV, unsigned int *selector) |
08ff6f2a HZ |
65 | { |
66 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
67 | unsigned char data, mask; | |
68 | ||
69 | if (check_range(info, min_uV, max_uV)) { | |
70 | dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n", | |
71 | min_uV, max_uV); | |
72 | return -EINVAL; | |
73 | } | |
5db6d09a | 74 | data = DIV_ROUND_UP(min_uV - info->min_uV, info->step_uV); |
3a93f2a9 | 75 | *selector = data; |
7f52ba77 | 76 | mask = rdev->desc->n_voltages - 1; |
08ff6f2a HZ |
77 | |
78 | return max8925_set_bits(info->i2c, info->vol_reg, mask, data); | |
79 | } | |
80 | ||
81 | static int max8925_get_voltage(struct regulator_dev *rdev) | |
82 | { | |
83 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
84 | unsigned char data, mask; | |
85 | int ret; | |
86 | ||
87 | ret = max8925_reg_read(info->i2c, info->vol_reg); | |
88 | if (ret < 0) | |
89 | return ret; | |
7f52ba77 AL |
90 | mask = rdev->desc->n_voltages - 1; |
91 | data = ret & mask; | |
08ff6f2a HZ |
92 | |
93 | return max8925_list_voltage(rdev, data); | |
94 | } | |
95 | ||
96 | static int max8925_enable(struct regulator_dev *rdev) | |
97 | { | |
98 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
99 | ||
100 | return max8925_set_bits(info->i2c, info->enable_reg, | |
65364e9a KL |
101 | LDO_SEQ_MASK << LDO_SEQ_SHIFT | |
102 | LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, | |
103 | LDO_SEQ_I2C << LDO_SEQ_SHIFT | | |
104 | LDO_I2C_EN << LDO_I2C_EN_SHIFT); | |
08ff6f2a HZ |
105 | } |
106 | ||
107 | static int max8925_disable(struct regulator_dev *rdev) | |
108 | { | |
109 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
110 | ||
111 | return max8925_set_bits(info->i2c, info->enable_reg, | |
65364e9a KL |
112 | LDO_SEQ_MASK << LDO_SEQ_SHIFT | |
113 | LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT, | |
114 | LDO_SEQ_I2C << LDO_SEQ_SHIFT); | |
08ff6f2a HZ |
115 | } |
116 | ||
117 | static int max8925_is_enabled(struct regulator_dev *rdev) | |
118 | { | |
119 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
65364e9a | 120 | int ldo_seq, ret; |
08ff6f2a | 121 | |
4b99fef0 | 122 | ret = max8925_reg_read(info->i2c, info->enable_reg); |
08ff6f2a HZ |
123 | if (ret < 0) |
124 | return ret; | |
65364e9a KL |
125 | ldo_seq = (ret >> LDO_SEQ_SHIFT) & LDO_SEQ_MASK; |
126 | if (ldo_seq != LDO_SEQ_I2C) | |
127 | return 1; | |
128 | else | |
129 | return ret & (LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT); | |
08ff6f2a HZ |
130 | } |
131 | ||
132 | static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV) | |
133 | { | |
134 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
135 | unsigned char data, mask; | |
136 | ||
137 | if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX) | |
138 | return -EINVAL; | |
139 | ||
5db6d09a | 140 | data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP); |
08ff6f2a HZ |
141 | data <<= SD1_DVM_SHIFT; |
142 | mask = 3 << SD1_DVM_SHIFT; | |
143 | ||
144 | return max8925_set_bits(info->i2c, info->enable_reg, mask, data); | |
145 | } | |
146 | ||
147 | static int max8925_set_dvm_enable(struct regulator_dev *rdev) | |
148 | { | |
149 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
150 | ||
151 | return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, | |
152 | 1 << SD1_DVM_EN); | |
153 | } | |
154 | ||
155 | static int max8925_set_dvm_disable(struct regulator_dev *rdev) | |
156 | { | |
157 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
158 | ||
159 | return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0); | |
160 | } | |
161 | ||
162 | static struct regulator_ops max8925_regulator_sdv_ops = { | |
42ff9431 | 163 | .list_voltage = max8925_list_voltage, |
08ff6f2a HZ |
164 | .set_voltage = max8925_set_voltage, |
165 | .get_voltage = max8925_get_voltage, | |
166 | .enable = max8925_enable, | |
167 | .disable = max8925_disable, | |
168 | .is_enabled = max8925_is_enabled, | |
169 | .set_suspend_voltage = max8925_set_dvm_voltage, | |
170 | .set_suspend_enable = max8925_set_dvm_enable, | |
171 | .set_suspend_disable = max8925_set_dvm_disable, | |
172 | }; | |
173 | ||
174 | static struct regulator_ops max8925_regulator_ldo_ops = { | |
42ff9431 | 175 | .list_voltage = max8925_list_voltage, |
08ff6f2a HZ |
176 | .set_voltage = max8925_set_voltage, |
177 | .get_voltage = max8925_get_voltage, | |
178 | .enable = max8925_enable, | |
179 | .disable = max8925_disable, | |
180 | .is_enabled = max8925_is_enabled, | |
181 | }; | |
182 | ||
183 | #define MAX8925_SDV(_id, min, max, step) \ | |
184 | { \ | |
185 | .desc = { \ | |
186 | .name = "SDV" #_id, \ | |
187 | .ops = &max8925_regulator_sdv_ops, \ | |
188 | .type = REGULATOR_VOLTAGE, \ | |
189 | .id = MAX8925_ID_SD##_id, \ | |
190 | .owner = THIS_MODULE, \ | |
7f52ba77 | 191 | .n_voltages = 64, \ |
08ff6f2a HZ |
192 | }, \ |
193 | .min_uV = min * 1000, \ | |
194 | .max_uV = max * 1000, \ | |
195 | .step_uV = step * 1000, \ | |
196 | .vol_reg = MAX8925_SDV##_id, \ | |
08ff6f2a | 197 | .enable_reg = MAX8925_SDCTL##_id, \ |
08ff6f2a HZ |
198 | } |
199 | ||
200 | #define MAX8925_LDO(_id, min, max, step) \ | |
201 | { \ | |
202 | .desc = { \ | |
203 | .name = "LDO" #_id, \ | |
204 | .ops = &max8925_regulator_ldo_ops, \ | |
205 | .type = REGULATOR_VOLTAGE, \ | |
206 | .id = MAX8925_ID_LDO##_id, \ | |
207 | .owner = THIS_MODULE, \ | |
7f52ba77 | 208 | .n_voltages = 64, \ |
08ff6f2a HZ |
209 | }, \ |
210 | .min_uV = min * 1000, \ | |
211 | .max_uV = max * 1000, \ | |
212 | .step_uV = step * 1000, \ | |
213 | .vol_reg = MAX8925_LDOVOUT##_id, \ | |
08ff6f2a | 214 | .enable_reg = MAX8925_LDOCTL##_id, \ |
08ff6f2a HZ |
215 | } |
216 | ||
217 | static struct max8925_regulator_info max8925_regulator_info[] = { | |
218 | MAX8925_SDV(1, 637.5, 1425, 12.5), | |
219 | MAX8925_SDV(2, 650, 2225, 25), | |
220 | MAX8925_SDV(3, 750, 3900, 50), | |
221 | ||
222 | MAX8925_LDO(1, 750, 3900, 50), | |
223 | MAX8925_LDO(2, 650, 2250, 25), | |
224 | MAX8925_LDO(3, 650, 2250, 25), | |
225 | MAX8925_LDO(4, 750, 3900, 50), | |
226 | MAX8925_LDO(5, 750, 3900, 50), | |
227 | MAX8925_LDO(6, 750, 3900, 50), | |
228 | MAX8925_LDO(7, 750, 3900, 50), | |
229 | MAX8925_LDO(8, 750, 3900, 50), | |
230 | MAX8925_LDO(9, 750, 3900, 50), | |
231 | MAX8925_LDO(10, 750, 3900, 50), | |
232 | MAX8925_LDO(11, 750, 3900, 50), | |
233 | MAX8925_LDO(12, 750, 3900, 50), | |
234 | MAX8925_LDO(13, 750, 3900, 50), | |
235 | MAX8925_LDO(14, 750, 3900, 50), | |
236 | MAX8925_LDO(15, 750, 3900, 50), | |
237 | MAX8925_LDO(16, 750, 3900, 50), | |
238 | MAX8925_LDO(17, 650, 2250, 25), | |
239 | MAX8925_LDO(18, 650, 2250, 25), | |
240 | MAX8925_LDO(19, 750, 3900, 50), | |
241 | MAX8925_LDO(20, 750, 3900, 50), | |
242 | }; | |
243 | ||
3fff6c04 | 244 | static struct max8925_regulator_info * __devinit find_regulator_info(int id) |
08ff6f2a HZ |
245 | { |
246 | struct max8925_regulator_info *ri; | |
247 | int i; | |
248 | ||
249 | for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { | |
250 | ri = &max8925_regulator_info[i]; | |
251 | if (ri->desc.id == id) | |
252 | return ri; | |
253 | } | |
254 | return NULL; | |
255 | } | |
256 | ||
257 | static int __devinit max8925_regulator_probe(struct platform_device *pdev) | |
258 | { | |
259 | struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); | |
260 | struct max8925_platform_data *pdata = chip->dev->platform_data; | |
c172708d | 261 | struct regulator_config config = { }; |
3fff6c04 | 262 | struct max8925_regulator_info *ri; |
08ff6f2a HZ |
263 | struct regulator_dev *rdev; |
264 | ||
265 | ri = find_regulator_info(pdev->id); | |
266 | if (ri == NULL) { | |
267 | dev_err(&pdev->dev, "invalid regulator ID specified\n"); | |
268 | return -EINVAL; | |
269 | } | |
270 | ri->i2c = chip->i2c; | |
271 | ri->chip = chip; | |
272 | ||
c172708d MB |
273 | config.dev = &pdev->dev; |
274 | config.init_data = pdata->regulator[pdev->id]; | |
275 | config.driver_data = ri; | |
276 | ||
277 | rdev = regulator_register(&ri->desc, &config); | |
08ff6f2a HZ |
278 | if (IS_ERR(rdev)) { |
279 | dev_err(&pdev->dev, "failed to register regulator %s\n", | |
280 | ri->desc.name); | |
281 | return PTR_ERR(rdev); | |
282 | } | |
283 | ||
284 | platform_set_drvdata(pdev, rdev); | |
285 | return 0; | |
286 | } | |
287 | ||
288 | static int __devexit max8925_regulator_remove(struct platform_device *pdev) | |
289 | { | |
290 | struct regulator_dev *rdev = platform_get_drvdata(pdev); | |
291 | ||
3fff6c04 | 292 | platform_set_drvdata(pdev, NULL); |
08ff6f2a | 293 | regulator_unregister(rdev); |
3fff6c04 | 294 | |
08ff6f2a HZ |
295 | return 0; |
296 | } | |
297 | ||
298 | static struct platform_driver max8925_regulator_driver = { | |
299 | .driver = { | |
300 | .name = "max8925-regulator", | |
301 | .owner = THIS_MODULE, | |
302 | }, | |
303 | .probe = max8925_regulator_probe, | |
304 | .remove = __devexit_p(max8925_regulator_remove), | |
305 | }; | |
306 | ||
307 | static int __init max8925_regulator_init(void) | |
308 | { | |
309 | return platform_driver_register(&max8925_regulator_driver); | |
310 | } | |
311 | subsys_initcall(max8925_regulator_init); | |
312 | ||
313 | static void __exit max8925_regulator_exit(void) | |
314 | { | |
315 | platform_driver_unregister(&max8925_regulator_driver); | |
316 | } | |
317 | module_exit(max8925_regulator_exit); | |
318 | ||
319 | MODULE_LICENSE("GPL"); | |
320 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); | |
321 | MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); | |
322 | MODULE_ALIAS("platform:max8925-regulator"); | |
323 |