regulator: lp8788-buck: Kill _gpio_request function
[linux-3.10.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     vol_reg;
42         int     enable_reg;
43 };
44
45 static int max8925_set_voltage_sel(struct regulator_dev *rdev,
46                                    unsigned int selector)
47 {
48         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
49         unsigned char mask = rdev->desc->n_voltages - 1;
50
51         return max8925_set_bits(info->i2c, info->vol_reg, mask, selector);
52 }
53
54 static int max8925_get_voltage_sel(struct regulator_dev *rdev)
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;
63         mask = rdev->desc->n_voltages - 1;
64         data = ret & mask;
65
66         return data;
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,
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);
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,
85                                 LDO_SEQ_MASK << LDO_SEQ_SHIFT |
86                                 LDO_I2C_EN_MASK << LDO_I2C_EN_SHIFT,
87                                 LDO_SEQ_I2C << LDO_SEQ_SHIFT);
88 }
89
90 static int max8925_is_enabled(struct regulator_dev *rdev)
91 {
92         struct max8925_regulator_info *info = rdev_get_drvdata(rdev);
93         int ldo_seq, ret;
94
95         ret = max8925_reg_read(info->i2c, info->enable_reg);
96         if (ret < 0)
97                 return ret;
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);
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
113         data = DIV_ROUND_UP(uV - SD1_DVM_VMIN, SD1_DVM_STEP);
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
135 static struct regulator_ops max8925_regulator_sdv_ops = {
136         .map_voltage            = regulator_map_voltage_linear,
137         .list_voltage           = regulator_list_voltage_linear,
138         .set_voltage_sel        = max8925_set_voltage_sel,
139         .get_voltage_sel        = max8925_get_voltage_sel,
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
148 static struct regulator_ops max8925_regulator_ldo_ops = {
149         .map_voltage            = regulator_map_voltage_linear,
150         .list_voltage           = regulator_list_voltage_linear,
151         .set_voltage_sel        = max8925_set_voltage_sel,
152         .get_voltage_sel        = max8925_get_voltage_sel,
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,                          \
166                 .n_voltages = 64,                               \
167                 .min_uV = min * 1000,                           \
168                 .uV_step = step * 1000,                         \
169         },                                                      \
170         .vol_reg        = MAX8925_SDV##_id,                     \
171         .enable_reg     = MAX8925_SDCTL##_id,                   \
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,                          \
182                 .n_voltages = 64,                               \
183                 .min_uV = min * 1000,                           \
184                 .uV_step = step * 1000,                         \
185         },                                                      \
186         .vol_reg        = MAX8925_LDOVOUT##_id,                 \
187         .enable_reg     = MAX8925_LDOCTL##_id,                  \
188 }
189
190 static struct max8925_regulator_info max8925_regulator_info[] = {
191         MAX8925_SDV(1, 637.5, 1425, 12.5),
192         MAX8925_SDV(2,   650, 2225,   25),
193         MAX8925_SDV(3,   750, 3900,   50),
194
195         MAX8925_LDO(1,  750, 3900, 50),
196         MAX8925_LDO(2,  650, 2250, 25),
197         MAX8925_LDO(3,  650, 2250, 25),
198         MAX8925_LDO(4,  750, 3900, 50),
199         MAX8925_LDO(5,  750, 3900, 50),
200         MAX8925_LDO(6,  750, 3900, 50),
201         MAX8925_LDO(7,  750, 3900, 50),
202         MAX8925_LDO(8,  750, 3900, 50),
203         MAX8925_LDO(9,  750, 3900, 50),
204         MAX8925_LDO(10, 750, 3900, 50),
205         MAX8925_LDO(11, 750, 3900, 50),
206         MAX8925_LDO(12, 750, 3900, 50),
207         MAX8925_LDO(13, 750, 3900, 50),
208         MAX8925_LDO(14, 750, 3900, 50),
209         MAX8925_LDO(15, 750, 3900, 50),
210         MAX8925_LDO(16, 750, 3900, 50),
211         MAX8925_LDO(17, 650, 2250, 25),
212         MAX8925_LDO(18, 650, 2250, 25),
213         MAX8925_LDO(19, 750, 3900, 50),
214         MAX8925_LDO(20, 750, 3900, 50),
215 };
216
217 static int __devinit max8925_regulator_probe(struct platform_device *pdev)
218 {
219         struct max8925_chip *chip = dev_get_drvdata(pdev->dev.parent);
220         struct regulator_init_data *pdata = pdev->dev.platform_data;
221         struct regulator_config config = { };
222         struct max8925_regulator_info *ri;
223         struct resource *res;
224         struct regulator_dev *rdev;
225         int i;
226
227         res = platform_get_resource(pdev, IORESOURCE_REG, 0);
228         if (!res) {
229                 dev_err(&pdev->dev, "No REG resource!\n");
230                 return -EINVAL;
231         }
232         for (i = 0; i < ARRAY_SIZE(max8925_regulator_info); i++) {
233                 ri = &max8925_regulator_info[i];
234                 if (ri->vol_reg == res->start)
235                         break;
236         }
237         if (i == ARRAY_SIZE(max8925_regulator_info)) {
238                 dev_err(&pdev->dev, "Failed to find regulator %llu\n",
239                         (unsigned long long)res->start);
240                 return -EINVAL;
241         }
242         ri->i2c = chip->i2c;
243         ri->chip = chip;
244
245         config.dev = &pdev->dev;
246         config.init_data = pdata;
247         config.driver_data = ri;
248
249         rdev = regulator_register(&ri->desc, &config);
250         if (IS_ERR(rdev)) {
251                 dev_err(&pdev->dev, "failed to register regulator %s\n",
252                                 ri->desc.name);
253                 return PTR_ERR(rdev);
254         }
255
256         platform_set_drvdata(pdev, rdev);
257         return 0;
258 }
259
260 static int __devexit max8925_regulator_remove(struct platform_device *pdev)
261 {
262         struct regulator_dev *rdev = platform_get_drvdata(pdev);
263
264         platform_set_drvdata(pdev, NULL);
265         regulator_unregister(rdev);
266
267         return 0;
268 }
269
270 static struct platform_driver max8925_regulator_driver = {
271         .driver         = {
272                 .name   = "max8925-regulator",
273                 .owner  = THIS_MODULE,
274         },
275         .probe          = max8925_regulator_probe,
276         .remove         = __devexit_p(max8925_regulator_remove),
277 };
278
279 static int __init max8925_regulator_init(void)
280 {
281         return platform_driver_register(&max8925_regulator_driver);
282 }
283 subsys_initcall(max8925_regulator_init);
284
285 static void __exit max8925_regulator_exit(void)
286 {
287         platform_driver_unregister(&max8925_regulator_driver);
288 }
289 module_exit(max8925_regulator_exit);
290
291 MODULE_LICENSE("GPL");
292 MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
293 MODULE_DESCRIPTION("Regulator Driver for Maxim 8925 PMIC");
294 MODULE_ALIAS("platform:max8925-regulator");