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[deliverable/linux.git] / drivers / regulator / max8925-regulator.c
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
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
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 */
34
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;
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,
64 int min_uV, int max_uV, unsigned int *selector)
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 }
74 data = DIV_ROUND_UP(min_uV - info->min_uV, info->step_uV);
75 *selector = data;
76 mask = rdev->desc->n_voltages - 1;
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;
90 mask = rdev->desc->n_voltages - 1;
91 data = ret & mask;
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,
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);
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,
112 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
113 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
114 LDO_SEQ_I2C << LDO_SEQ_SHIFT);
115 }
116
117 static int max8925_is_enabled(struct regulator_dev *rdev)
118 {
119 struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
120 int ldo_seq, ret;
121
122 ret = max8925_reg_read(info->i2c, info->enable_reg);
123 if (ret < 0)
124 return ret;
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);
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
140 data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP);
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 = {
163 .list_voltage = max8925_list_voltage,
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 = {
175 .list_voltage = max8925_list_voltage,
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, \
191 .n_voltages = 64, \
192 }, \
193 .min_uV = min * 1000, \
194 .max_uV = max * 1000, \
195 .step_uV = step * 1000, \
196 .vol_reg = MAX8925_SDV##_id, \
197 .enable_reg = MAX8925_SDCTL##_id, \
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, \
208 .n_voltages = 64, \
209 }, \
210 .min_uV = min * 1000, \
211 .max_uV = max * 1000, \
212 .step_uV = step * 1000, \
213 .vol_reg = MAX8925_LDOVOUT##_id, \
214 .enable_reg = MAX8925_LDOCTL##_id, \
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
244 static struct max8925_regulator_info * __devinit find_regulator_info(int id)
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;
261 struct regulator_config config = { };
262 struct max8925_regulator_info *ri;
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
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);
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
292 platform_set_drvdata(pdev, NULL);
293 regulator_unregister(rdev);
294
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
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