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Linux/drivers/regulator/aat2870-regulator.c

  1 /*
  2  * linux/drivers/regulator/aat2870-regulator.c
  3  *
  4  * Copyright (c) 2011, NVIDIA Corporation.
  5  * Author: Jin Park <jinyoungp@nvidia.com>
  6  *
  7  * This program is free software; you can redistribute it and/or
  8  * modify it under the terms of the GNU General Public License
  9  * version 2 as published by the Free Software Foundation.
 10  *
 11  * This program is distributed in the hope that it will be useful, but
 12  * WITHOUT ANY WARRANTY; without even the implied warranty of
 13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 14  * General Public License for more details.
 15  *
 16  * You should have received a copy of the GNU General Public License
 17  * along with this program; if not, write to the Free Software
 18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 19  * 02110-1301 USA
 20  */
 21 
 22 #include <linux/kernel.h>
 23 #include <linux/init.h>
 24 #include <linux/err.h>
 25 #include <linux/module.h>
 26 #include <linux/slab.h>
 27 #include <linux/platform_device.h>
 28 #include <linux/regulator/driver.h>
 29 #include <linux/regulator/machine.h>
 30 #include <linux/mfd/aat2870.h>
 31 
 32 struct aat2870_regulator {
 33         struct aat2870_data *aat2870;
 34         struct regulator_desc desc;
 35 
 36         u8 enable_addr;
 37         u8 enable_shift;
 38         u8 enable_mask;
 39 
 40         u8 voltage_addr;
 41         u8 voltage_shift;
 42         u8 voltage_mask;
 43 };
 44 
 45 static int aat2870_ldo_set_voltage_sel(struct regulator_dev *rdev,
 46                                        unsigned selector)
 47 {
 48         struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
 49         struct aat2870_data *aat2870 = ri->aat2870;
 50 
 51         return aat2870->update(aat2870, ri->voltage_addr, ri->voltage_mask,
 52                                selector << ri->voltage_shift);
 53 }
 54 
 55 static int aat2870_ldo_get_voltage_sel(struct regulator_dev *rdev)
 56 {
 57         struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
 58         struct aat2870_data *aat2870 = ri->aat2870;
 59         u8 val;
 60         int ret;
 61 
 62         ret = aat2870->read(aat2870, ri->voltage_addr, &val);
 63         if (ret)
 64                 return ret;
 65 
 66         return (val & ri->voltage_mask) >> ri->voltage_shift;
 67 }
 68 
 69 static int aat2870_ldo_enable(struct regulator_dev *rdev)
 70 {
 71         struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
 72         struct aat2870_data *aat2870 = ri->aat2870;
 73 
 74         return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask,
 75                                ri->enable_mask);
 76 }
 77 
 78 static int aat2870_ldo_disable(struct regulator_dev *rdev)
 79 {
 80         struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
 81         struct aat2870_data *aat2870 = ri->aat2870;
 82 
 83         return aat2870->update(aat2870, ri->enable_addr, ri->enable_mask, 0);
 84 }
 85 
 86 static int aat2870_ldo_is_enabled(struct regulator_dev *rdev)
 87 {
 88         struct aat2870_regulator *ri = rdev_get_drvdata(rdev);
 89         struct aat2870_data *aat2870 = ri->aat2870;
 90         u8 val;
 91         int ret;
 92 
 93         ret = aat2870->read(aat2870, ri->enable_addr, &val);
 94         if (ret)
 95                 return ret;
 96 
 97         return val & ri->enable_mask ? 1 : 0;
 98 }
 99 
100 static struct regulator_ops aat2870_ldo_ops = {
101         .list_voltage = regulator_list_voltage_table,
102         .map_voltage = regulator_map_voltage_ascend,
103         .set_voltage_sel = aat2870_ldo_set_voltage_sel,
104         .get_voltage_sel = aat2870_ldo_get_voltage_sel,
105         .enable = aat2870_ldo_enable,
106         .disable = aat2870_ldo_disable,
107         .is_enabled = aat2870_ldo_is_enabled,
108 };
109 
110 static const unsigned int aat2870_ldo_voltages[] = {
111         1200000, 1300000, 1500000, 1600000,
112         1800000, 2000000, 2200000, 2500000,
113         2600000, 2700000, 2800000, 2900000,
114         3000000, 3100000, 3200000, 3300000,
115 };
116 
117 #define AAT2870_LDO(ids)                                \
118         {                                               \
119                 .desc = {                               \
120                         .name = #ids,                   \
121                         .id = AAT2870_ID_##ids,         \
122                         .n_voltages = ARRAY_SIZE(aat2870_ldo_voltages), \
123                         .volt_table = aat2870_ldo_voltages, \
124                         .ops = &aat2870_ldo_ops,        \
125                         .type = REGULATOR_VOLTAGE,      \
126                         .owner = THIS_MODULE,           \
127                 },                                      \
128         }
129 
130 static struct aat2870_regulator aat2870_regulators[] = {
131         AAT2870_LDO(LDOA),
132         AAT2870_LDO(LDOB),
133         AAT2870_LDO(LDOC),
134         AAT2870_LDO(LDOD),
135 };
136 
137 static struct aat2870_regulator *aat2870_get_regulator(int id)
138 {
139         struct aat2870_regulator *ri = NULL;
140         int i;
141 
142         for (i = 0; i < ARRAY_SIZE(aat2870_regulators); i++) {
143                 ri = &aat2870_regulators[i];
144                 if (ri->desc.id == id)
145                         break;
146         }
147 
148         if (i == ARRAY_SIZE(aat2870_regulators))
149                 return NULL;
150 
151         ri->enable_addr = AAT2870_LDO_EN;
152         ri->enable_shift = id - AAT2870_ID_LDOA;
153         ri->enable_mask = 0x1 << ri->enable_shift;
154 
155         ri->voltage_addr = (id - AAT2870_ID_LDOA) / 2 ?
156                            AAT2870_LDO_CD : AAT2870_LDO_AB;
157         ri->voltage_shift = (id - AAT2870_ID_LDOA) % 2 ? 0 : 4;
158         ri->voltage_mask = 0xF << ri->voltage_shift;
159 
160         return ri;
161 }
162 
163 static int aat2870_regulator_probe(struct platform_device *pdev)
164 {
165         struct aat2870_regulator *ri;
166         struct regulator_config config = { };
167         struct regulator_dev *rdev;
168 
169         ri = aat2870_get_regulator(pdev->id);
170         if (!ri) {
171                 dev_err(&pdev->dev, "Invalid device ID, %d\n", pdev->id);
172                 return -EINVAL;
173         }
174         ri->aat2870 = dev_get_drvdata(pdev->dev.parent);
175 
176         config.dev = &pdev->dev;
177         config.driver_data = ri;
178         config.init_data = dev_get_platdata(&pdev->dev);
179 
180         rdev = devm_regulator_register(&pdev->dev, &ri->desc, &config);
181         if (IS_ERR(rdev)) {
182                 dev_err(&pdev->dev, "Failed to register regulator %s\n",
183                         ri->desc.name);
184                 return PTR_ERR(rdev);
185         }
186         platform_set_drvdata(pdev, rdev);
187 
188         return 0;
189 }
190 
191 static struct platform_driver aat2870_regulator_driver = {
192         .driver = {
193                 .name   = "aat2870-regulator",
194                 .owner  = THIS_MODULE,
195         },
196         .probe  = aat2870_regulator_probe,
197 };
198 
199 static int __init aat2870_regulator_init(void)
200 {
201         return platform_driver_register(&aat2870_regulator_driver);
202 }
203 subsys_initcall(aat2870_regulator_init);
204 
205 static void __exit aat2870_regulator_exit(void)
206 {
207         platform_driver_unregister(&aat2870_regulator_driver);
208 }
209 module_exit(aat2870_regulator_exit);
210 
211 MODULE_DESCRIPTION("AnalogicTech AAT2870 Regulator");
212 MODULE_LICENSE("GPL");
213 MODULE_AUTHOR("Jin Park <jinyoungp@nvidia.com>");
214 MODULE_ALIAS("platform:aat2870-regulator");
215 

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