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i2c: Fix error value returned by several bus drivers
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / regulator / max8925-regulator.c
blobe4dbd667c043577b2cfe250df38fbbdcf3869eb1
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
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
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,
62 int min_uV, int max_uV, unsigned int *selector)
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;
73 *selector = data;
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,
100 OUT_ENABLE << info->enable_bit,
101 OUT_ENABLE << info->enable_bit);
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,
109 OUT_ENABLE << info->enable_bit,
110 OUT_DISABLE << info->enable_bit);
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
118 ret = max8925_reg_read(info->i2c, info->enable_reg);
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
239 static struct max8925_regulator_info * __devinit find_regulator_info(int id)
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;
256 struct max8925_regulator_info *ri;
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
283 platform_set_drvdata(pdev, NULL);
284 regulator_unregister(rdev);
285
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
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