Version:  2.0.40 2.2.26 2.4.37 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17

Linux/drivers/regulator/wm8400-regulator.c

  1 /*
  2  * Regulator support for WM8400
  3  *
  4  * Copyright 2008 Wolfson Microelectronics PLC.
  5  *
  6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  7  *
  8  * This program is free software; you can redistribute it and/or
  9  * modify it under the terms of the GNU General Public License as
 10  * published by the Free Software Foundation; either version 2 of the
 11  * License, or (at your option) any later version.
 12  *
 13  */
 14 
 15 #include <linux/bug.h>
 16 #include <linux/err.h>
 17 #include <linux/kernel.h>
 18 #include <linux/module.h>
 19 #include <linux/regulator/driver.h>
 20 #include <linux/mfd/wm8400-private.h>
 21 
 22 static const struct regulator_linear_range wm8400_ldo_ranges[] = {
 23         REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000),
 24         REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000),
 25 };
 26 
 27 static struct regulator_ops wm8400_ldo_ops = {
 28         .is_enabled = regulator_is_enabled_regmap,
 29         .enable = regulator_enable_regmap,
 30         .disable = regulator_disable_regmap,
 31         .list_voltage = regulator_list_voltage_linear_range,
 32         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 33         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 34         .map_voltage = regulator_map_voltage_linear_range,
 35 };
 36 
 37 static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
 38 {
 39         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 40         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 41         u16 data[2];
 42         int ret;
 43 
 44         ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
 45                                 data);
 46         if (ret != 0)
 47                 return 0;
 48 
 49         /* Datasheet: hibernate */
 50         if (data[0] & WM8400_DC1_SLEEP)
 51                 return REGULATOR_MODE_STANDBY;
 52 
 53         /* Datasheet: standby */
 54         if (!(data[0] & WM8400_DC1_ACTIVE))
 55                 return REGULATOR_MODE_IDLE;
 56 
 57         /* Datasheet: active with or without force PWM */
 58         if (data[1] & WM8400_DC1_FRC_PWM)
 59                 return REGULATOR_MODE_FAST;
 60         else
 61                 return REGULATOR_MODE_NORMAL;
 62 }
 63 
 64 static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
 65 {
 66         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
 67         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
 68         int ret;
 69 
 70         switch (mode) {
 71         case REGULATOR_MODE_FAST:
 72                 /* Datasheet: active with force PWM */
 73                 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
 74                                       WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
 75                 if (ret != 0)
 76                         return ret;
 77 
 78                 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 79                                        WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
 80                                        WM8400_DC1_ACTIVE);
 81 
 82         case REGULATOR_MODE_NORMAL:
 83                 /* Datasheet: active */
 84                 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
 85                                       WM8400_DC1_FRC_PWM, 0);
 86                 if (ret != 0)
 87                         return ret;
 88 
 89                 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 90                                        WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
 91                                        WM8400_DC1_ACTIVE);
 92 
 93         case REGULATOR_MODE_IDLE:
 94                 /* Datasheet: standby */
 95                 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
 96                                        WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 0);
 97         default:
 98                 return -EINVAL;
 99         }
100 }
101 
102 static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
103                                                  int input_uV, int output_uV,
104                                                  int load_uA)
105 {
106         return REGULATOR_MODE_NORMAL;
107 }
108 
109 static struct regulator_ops wm8400_dcdc_ops = {
110         .is_enabled = regulator_is_enabled_regmap,
111         .enable = regulator_enable_regmap,
112         .disable = regulator_disable_regmap,
113         .list_voltage = regulator_list_voltage_linear,
114         .map_voltage = regulator_map_voltage_linear,
115         .get_voltage_sel = regulator_get_voltage_sel_regmap,
116         .set_voltage_sel = regulator_set_voltage_sel_regmap,
117         .get_mode = wm8400_dcdc_get_mode,
118         .set_mode = wm8400_dcdc_set_mode,
119         .get_optimum_mode = wm8400_dcdc_get_optimum_mode,
120 };
121 
122 static struct regulator_desc regulators[] = {
123         {
124                 .name = "LDO1",
125                 .id = WM8400_LDO1,
126                 .ops = &wm8400_ldo_ops,
127                 .enable_reg = WM8400_LDO1_CONTROL,
128                 .enable_mask = WM8400_LDO1_ENA,
129                 .n_voltages = WM8400_LDO1_VSEL_MASK + 1,
130                 .linear_ranges = wm8400_ldo_ranges,
131                 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
132                 .vsel_reg = WM8400_LDO1_CONTROL,
133                 .vsel_mask = WM8400_LDO1_VSEL_MASK,
134                 .type = REGULATOR_VOLTAGE,
135                 .owner = THIS_MODULE,
136         },
137         {
138                 .name = "LDO2",
139                 .id = WM8400_LDO2,
140                 .ops = &wm8400_ldo_ops,
141                 .enable_reg = WM8400_LDO2_CONTROL,
142                 .enable_mask = WM8400_LDO2_ENA,
143                 .n_voltages = WM8400_LDO2_VSEL_MASK + 1,
144                 .linear_ranges = wm8400_ldo_ranges,
145                 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
146                 .type = REGULATOR_VOLTAGE,
147                 .vsel_reg = WM8400_LDO2_CONTROL,
148                 .vsel_mask = WM8400_LDO2_VSEL_MASK,
149                 .owner = THIS_MODULE,
150         },
151         {
152                 .name = "LDO3",
153                 .id = WM8400_LDO3,
154                 .ops = &wm8400_ldo_ops,
155                 .enable_reg = WM8400_LDO3_CONTROL,
156                 .enable_mask = WM8400_LDO3_ENA,
157                 .n_voltages = WM8400_LDO3_VSEL_MASK + 1,
158                 .linear_ranges = wm8400_ldo_ranges,
159                 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
160                 .vsel_reg = WM8400_LDO3_CONTROL,
161                 .vsel_mask = WM8400_LDO3_VSEL_MASK,
162                 .type = REGULATOR_VOLTAGE,
163                 .owner = THIS_MODULE,
164         },
165         {
166                 .name = "LDO4",
167                 .id = WM8400_LDO4,
168                 .ops = &wm8400_ldo_ops,
169                 .enable_reg = WM8400_LDO4_CONTROL,
170                 .enable_mask = WM8400_LDO4_ENA,
171                 .n_voltages = WM8400_LDO4_VSEL_MASK + 1,
172                 .linear_ranges = wm8400_ldo_ranges,
173                 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
174                 .vsel_reg = WM8400_LDO4_CONTROL,
175                 .vsel_mask = WM8400_LDO4_VSEL_MASK,
176                 .type = REGULATOR_VOLTAGE,
177                 .owner = THIS_MODULE,
178         },
179         {
180                 .name = "DCDC1",
181                 .id = WM8400_DCDC1,
182                 .ops = &wm8400_dcdc_ops,
183                 .enable_reg = WM8400_DCDC1_CONTROL_1,
184                 .enable_mask = WM8400_DC1_ENA_MASK,
185                 .n_voltages = WM8400_DC1_VSEL_MASK + 1,
186                 .vsel_reg = WM8400_DCDC1_CONTROL_1,
187                 .vsel_mask = WM8400_DC1_VSEL_MASK,
188                 .min_uV = 850000,
189                 .uV_step = 25000,
190                 .type = REGULATOR_VOLTAGE,
191                 .owner = THIS_MODULE,
192         },
193         {
194                 .name = "DCDC2",
195                 .id = WM8400_DCDC2,
196                 .ops = &wm8400_dcdc_ops,
197                 .enable_reg = WM8400_DCDC2_CONTROL_1,
198                 .enable_mask = WM8400_DC1_ENA_MASK,
199                 .n_voltages = WM8400_DC2_VSEL_MASK + 1,
200                 .vsel_reg = WM8400_DCDC2_CONTROL_1,
201                 .vsel_mask = WM8400_DC2_VSEL_MASK,
202                 .min_uV = 850000,
203                 .uV_step = 25000,
204                 .type = REGULATOR_VOLTAGE,
205                 .owner = THIS_MODULE,
206         },
207 };
208 
209 static int wm8400_regulator_probe(struct platform_device *pdev)
210 {
211         struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
212         struct regulator_config config = { };
213         struct regulator_dev *rdev;
214 
215         config.dev = &pdev->dev;
216         config.init_data = dev_get_platdata(&pdev->dev);
217         config.driver_data = wm8400;
218         config.regmap = wm8400->regmap;
219 
220         rdev = devm_regulator_register(&pdev->dev, &regulators[pdev->id],
221                                        &config);
222         if (IS_ERR(rdev))
223                 return PTR_ERR(rdev);
224 
225         platform_set_drvdata(pdev, rdev);
226 
227         return 0;
228 }
229 
230 static struct platform_driver wm8400_regulator_driver = {
231         .driver = {
232                 .name = "wm8400-regulator",
233         },
234         .probe = wm8400_regulator_probe,
235 };
236 
237 /**
238  * wm8400_register_regulator - enable software control of a WM8400 regulator
239  *
240  * This function enables software control of a WM8400 regulator via
241  * the regulator API.  It is intended to be called from the
242  * platform_init() callback of the WM8400 MFD driver.
243  *
244  * @param dev      The WM8400 device to operate on.
245  * @param reg      The regulator to control.
246  * @param initdata Regulator initdata for the regulator.
247  */
248 int wm8400_register_regulator(struct device *dev, int reg,
249                               struct regulator_init_data *initdata)
250 {
251         struct wm8400 *wm8400 = dev_get_drvdata(dev);
252 
253         if (wm8400->regulators[reg].name)
254                 return -EBUSY;
255 
256         initdata->driver_data = wm8400;
257 
258         wm8400->regulators[reg].name = "wm8400-regulator";
259         wm8400->regulators[reg].id = reg;
260         wm8400->regulators[reg].dev.parent = dev;
261         wm8400->regulators[reg].dev.platform_data = initdata;
262 
263         return platform_device_register(&wm8400->regulators[reg]);
264 }
265 EXPORT_SYMBOL_GPL(wm8400_register_regulator);
266 
267 static int __init wm8400_regulator_init(void)
268 {
269         return platform_driver_register(&wm8400_regulator_driver);
270 }
271 subsys_initcall(wm8400_regulator_init);
272 
273 static void __exit wm8400_regulator_exit(void)
274 {
275         platform_driver_unregister(&wm8400_regulator_driver);
276 }
277 module_exit(wm8400_regulator_exit);
278 
279 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
280 MODULE_DESCRIPTION("WM8400 regulator driver");
281 MODULE_LICENSE("GPL");
282 MODULE_ALIAS("platform:wm8400-regulator");
283 

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