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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> | |
12 | #include <linux/init.h> | |
13 | #include <linux/err.h> | |
14 | #include <linux/i2c.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/regulator/driver.h> | |
17 | #include <linux/regulator/machine.h> | |
18 | #include <linux/mfd/max8925.h> | |
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 | ||
db13c040 HZ |
26 | /* bit definitions in SD & LDO control registers */ |
27 | #define OUT_ENABLE 0x1f /* Power U/D sequence as I2C */ | |
28 | #define OUT_DISABLE 0x1e /* Power U/D sequence as I2C */ | |
29 | ||
08ff6f2a HZ |
30 | struct max8925_regulator_info { |
31 | struct regulator_desc desc; | |
32 | struct regulator_dev *regulator; | |
33 | struct i2c_client *i2c; | |
34 | struct max8925_chip *chip; | |
35 | ||
36 | int min_uV; | |
37 | int max_uV; | |
38 | int step_uV; | |
39 | int vol_reg; | |
40 | int vol_shift; | |
41 | int vol_nbits; | |
42 | int enable_bit; | |
43 | int enable_reg; | |
44 | }; | |
45 | ||
46 | static inline int check_range(struct max8925_regulator_info *info, | |
47 | int min_uV, int max_uV) | |
48 | { | |
49 | if (min_uV < info->min_uV || min_uV > info->max_uV) | |
50 | return -EINVAL; | |
51 | ||
52 | return 0; | |
53 | } | |
54 | ||
55 | static int max8925_list_voltage(struct regulator_dev *rdev, unsigned index) | |
56 | { | |
57 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
58 | return info->min_uV + index * info->step_uV; | |
59 | } | |
60 | ||
61 | static int max8925_set_voltage(struct regulator_dev *rdev, | |
3a93f2a9 | 62 | int min_uV, int max_uV, unsigned int *selector) |
08ff6f2a HZ |
63 | { |
64 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
65 | unsigned char data, mask; | |
66 | ||
67 | if (check_range(info, min_uV, max_uV)) { | |
68 | dev_err(info->chip->dev, "invalid voltage range (%d, %d) uV\n", | |
69 | min_uV, max_uV); | |
70 | return -EINVAL; | |
71 | } | |
72 | data = (min_uV - info->min_uV + info->step_uV - 1) / info->step_uV; | |
3a93f2a9 | 73 | *selector = data; |
08ff6f2a HZ |
74 | data <<= info->vol_shift; |
75 | mask = ((1 << info->vol_nbits) - 1) << info->vol_shift; | |
76 | ||
77 | return max8925_set_bits(info->i2c, info->vol_reg, mask, data); | |
78 | } | |
79 | ||
80 | static int max8925_get_voltage(struct regulator_dev *rdev) | |
81 | { | |
82 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
83 | unsigned char data, mask; | |
84 | int ret; | |
85 | ||
86 | ret = max8925_reg_read(info->i2c, info->vol_reg); | |
87 | if (ret < 0) | |
88 | return ret; | |
89 | mask = ((1 << info->vol_nbits) - 1) << info->vol_shift; | |
90 | data = (ret & mask) >> info->vol_shift; | |
91 | ||
92 | return max8925_list_voltage(rdev, data); | |
93 | } | |
94 | ||
95 | static int max8925_enable(struct regulator_dev *rdev) | |
96 | { | |
97 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
98 | ||
99 | return max8925_set_bits(info->i2c, info->enable_reg, | |
db13c040 HZ |
100 | OUT_ENABLE << info->enable_bit, |
101 | OUT_ENABLE << info->enable_bit); | |
08ff6f2a HZ |
102 | } |
103 | ||
104 | static int max8925_disable(struct regulator_dev *rdev) | |
105 | { | |
106 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
107 | ||
108 | return max8925_set_bits(info->i2c, info->enable_reg, | |
db13c040 HZ |
109 | OUT_ENABLE << info->enable_bit, |
110 | OUT_DISABLE << info->enable_bit); | |
08ff6f2a HZ |
111 | } |
112 | ||
113 | static int max8925_is_enabled(struct regulator_dev *rdev) | |
114 | { | |
115 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
116 | int ret; | |
117 | ||
4b99fef0 | 118 | ret = max8925_reg_read(info->i2c, info->enable_reg); |
08ff6f2a HZ |
119 | if (ret < 0) |
120 | return ret; | |
121 | ||
122 | return ret & (1 << info->enable_bit); | |
123 | } | |
124 | ||
125 | static int max8925_set_dvm_voltage(struct regulator_dev *rdev, int uV) | |
126 | { | |
127 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
128 | unsigned char data, mask; | |
129 | ||
130 | if (uV < SD1_DVM_VMIN || uV > SD1_DVM_VMAX) | |
131 | return -EINVAL; | |
132 | ||
133 | data = (uV - SD1_DVM_VMIN + SD1_DVM_STEP - 1) / SD1_DVM_STEP; | |
134 | data <<= SD1_DVM_SHIFT; | |
135 | mask = 3 << SD1_DVM_SHIFT; | |
136 | ||
137 | return max8925_set_bits(info->i2c, info->enable_reg, mask, data); | |
138 | } | |
139 | ||
140 | static int max8925_set_dvm_enable(struct regulator_dev *rdev) | |
141 | { | |
142 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
143 | ||
144 | return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, | |
145 | 1 << SD1_DVM_EN); | |
146 | } | |
147 | ||
148 | static int max8925_set_dvm_disable(struct regulator_dev *rdev) | |
149 | { | |
150 | struct max8925_regulator_info *info = rdev_get_drvdata(rdev); | |
151 | ||
152 | return max8925_set_bits(info->i2c, info->vol_reg, 1 << SD1_DVM_EN, 0); | |
153 | } | |
154 | ||
155 | static struct regulator_ops max8925_regulator_sdv_ops = { | |
156 | .set_voltage = max8925_set_voltage, | |
157 | .get_voltage = max8925_get_voltage, | |
158 | .enable = max8925_enable, | |
159 | .disable = max8925_disable, | |
160 | .is_enabled = max8925_is_enabled, | |
161 | .set_suspend_voltage = max8925_set_dvm_voltage, | |
162 | .set_suspend_enable = max8925_set_dvm_enable, | |
163 | .set_suspend_disable = max8925_set_dvm_disable, | |
164 | }; | |
165 | ||
166 | static struct regulator_ops max8925_regulator_ldo_ops = { | |
167 | .set_voltage = max8925_set_voltage, | |
168 | .get_voltage = max8925_get_voltage, | |
169 | .enable = max8925_enable, | |
170 | .disable = max8925_disable, | |
171 | .is_enabled = max8925_is_enabled, | |
172 | }; | |
173 | ||
174 | #define MAX8925_SDV(_id, min, max, step) \ | |
175 | { \ | |
176 | .desc = { \ | |
177 | .name = "SDV" #_id, \ | |
178 | .ops = &max8925_regulator_sdv_ops, \ | |
179 | .type = REGULATOR_VOLTAGE, \ | |
180 | .id = MAX8925_ID_SD##_id, \ | |
181 | .owner = THIS_MODULE, \ | |
182 | }, \ | |
183 | .min_uV = min * 1000, \ | |
184 | .max_uV = max * 1000, \ | |
185 | .step_uV = step * 1000, \ | |
186 | .vol_reg = MAX8925_SDV##_id, \ | |
187 | .vol_shift = 0, \ | |
188 | .vol_nbits = 6, \ | |
189 | .enable_reg = MAX8925_SDCTL##_id, \ | |
190 | .enable_bit = 0, \ | |
191 | } | |
192 | ||
193 | #define MAX8925_LDO(_id, min, max, step) \ | |
194 | { \ | |
195 | .desc = { \ | |
196 | .name = "LDO" #_id, \ | |
197 | .ops = &max8925_regulator_ldo_ops, \ | |
198 | .type = REGULATOR_VOLTAGE, \ | |
199 | .id = MAX8925_ID_LDO##_id, \ | |
200 | .owner = THIS_MODULE, \ | |
201 | }, \ | |
202 | .min_uV = min * 1000, \ | |
203 | .max_uV = max * 1000, \ | |
204 | .step_uV = step * 1000, \ | |
205 | .vol_reg = MAX8925_LDOVOUT##_id, \ | |
206 | .vol_shift = 0, \ | |
207 | .vol_nbits = 6, \ | |
208 | .enable_reg = MAX8925_LDOCTL##_id, \ | |
209 | .enable_bit = 0, \ | |
210 | } | |
211 | ||
212 | static struct max8925_regulator_info max8925_regulator_info[] = { | |
213 | MAX8925_SDV(1, 637.5, 1425, 12.5), | |
214 | MAX8925_SDV(2, 650, 2225, 25), | |
215 | MAX8925_SDV(3, 750, 3900, 50), | |
216 | ||
217 | MAX8925_LDO(1, 750, 3900, 50), | |
218 | MAX8925_LDO(2, 650, 2250, 25), | |
219 | MAX8925_LDO(3, 650, 2250, 25), | |
220 | MAX8925_LDO(4, 750, 3900, 50), | |
221 | MAX8925_LDO(5, 750, 3900, 50), | |
222 | MAX8925_LDO(6, 750, 3900, 50), | |
223 | MAX8925_LDO(7, 750, 3900, 50), | |
224 | MAX8925_LDO(8, 750, 3900, 50), | |
225 | MAX8925_LDO(9, 750, 3900, 50), | |
226 | MAX8925_LDO(10, 750, 3900, 50), | |
227 | MAX8925_LDO(11, 750, 3900, 50), | |
228 | MAX8925_LDO(12, 750, 3900, 50), | |
229 | MAX8925_LDO(13, 750, 3900, 50), | |
230 | MAX8925_LDO(14, 750, 3900, 50), | |
231 | MAX8925_LDO(15, 750, 3900, 50), | |
232 | MAX8925_LDO(16, 750, 3900, 50), | |
233 | MAX8925_LDO(17, 650, 2250, 25), | |
234 | MAX8925_LDO(18, 650, 2250, 25), | |
235 | MAX8925_LDO(19, 750, 3900, 50), | |
236 | MAX8925_LDO(20, 750, 3900, 50), | |
237 | }; | |
238 | ||
3fff6c04 | 239 | static struct max8925_regulator_info * __devinit find_regulator_info(int id) |
08ff6f2a HZ |
240 | { |
241 | struct max8925_regulator_info *ri; | |
242 | int i; | |
243 | ||
244 | for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) { | |
245 | ri = &max8925_regulator_info[i]; | |
246 | if (ri->desc.id == id) | |
247 | return ri; | |
248 | } | |
249 | return NULL; | |
250 | } | |
251 | ||
252 | static int __devinit max8925_regulator_probe(struct platform_device *pdev) | |
253 | { | |
254 | struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent); | |
255 | struct max8925_platform_data *pdata = chip->dev->platform_data; | |
3fff6c04 | 256 | struct max8925_regulator_info *ri; |
08ff6f2a HZ |
257 | struct regulator_dev *rdev; |
258 | ||
259 | ri = find_regulator_info(pdev->id); | |
260 | if (ri == NULL) { | |
261 | dev_err(&pdev->dev, "invalid regulator ID specified\n"); | |
262 | return -EINVAL; | |
263 | } | |
264 | ri->i2c = chip->i2c; | |
265 | ri->chip = chip; | |
266 | ||
267 | rdev = regulator_register(&ri->desc, &pdev->dev, | |
268 | pdata->regulator[pdev->id], ri); | |
269 | if (IS_ERR(rdev)) { | |
270 | dev_err(&pdev->dev, "failed to register regulator %s\n", | |
271 | ri->desc.name); | |
272 | return PTR_ERR(rdev); | |
273 | } | |
274 | ||
275 | platform_set_drvdata(pdev, rdev); | |
276 | return 0; | |
277 | } | |
278 | ||
279 | static int __devexit max8925_regulator_remove(struct platform_device *pdev) | |
280 | { | |
281 | struct regulator_dev *rdev = platform_get_drvdata(pdev); | |
282 | ||
3fff6c04 | 283 | platform_set_drvdata(pdev, NULL); |
08ff6f2a | 284 | regulator_unregister(rdev); |
3fff6c04 | 285 | |
08ff6f2a HZ |
286 | return 0; |
287 | } | |
288 | ||
289 | static struct platform_driver max8925_regulator_driver = { | |
290 | .driver = { | |
291 | .name = "max8925-regulator", | |
292 | .owner = THIS_MODULE, | |
293 | }, | |
294 | .probe = max8925_regulator_probe, | |
295 | .remove = __devexit_p(max8925_regulator_remove), | |
296 | }; | |
297 | ||
298 | static int __init max8925_regulator_init(void) | |
299 | { | |
300 | return platform_driver_register(&max8925_regulator_driver); | |
301 | } | |
302 | subsys_initcall(max8925_regulator_init); | |
303 | ||
304 | static void __exit max8925_regulator_exit(void) | |
305 | { | |
306 | platform_driver_unregister(&max8925_regulator_driver); | |
307 | } | |
308 | module_exit(max8925_regulator_exit); | |
309 | ||
310 | MODULE_LICENSE("GPL"); | |
311 | MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>"); | |
312 | MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC"); | |
313 | MODULE_ALIAS("platform:max8925-regulator"); | |
314 |