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Linux/drivers/regulator/arizona-ldo1.c

  1 /*
  2  * arizona-ldo1.c  --  LDO1 supply for Arizona devices
  3  *
  4  * Copyright 2012 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 modify it
  9  *  under  the terms of  the GNU General  Public License as published by the
 10  *  Free Software Foundation;  either version 2 of the  License, or (at your
 11  *  option) any later version.
 12  */
 13 
 14 #include <linux/module.h>
 15 #include <linux/moduleparam.h>
 16 #include <linux/init.h>
 17 #include <linux/bitops.h>
 18 #include <linux/err.h>
 19 #include <linux/platform_device.h>
 20 #include <linux/regulator/driver.h>
 21 #include <linux/regulator/machine.h>
 22 #include <linux/gpio.h>
 23 #include <linux/slab.h>
 24 
 25 #include <linux/mfd/arizona/core.h>
 26 #include <linux/mfd/arizona/pdata.h>
 27 #include <linux/mfd/arizona/registers.h>
 28 
 29 struct arizona_ldo1 {
 30         struct regulator_dev *regulator;
 31         struct arizona *arizona;
 32 
 33         struct regulator_consumer_supply supply;
 34         struct regulator_init_data init_data;
 35 };
 36 
 37 static int arizona_ldo1_hc_list_voltage(struct regulator_dev *rdev,
 38                                         unsigned int selector)
 39 {
 40         if (selector >= rdev->desc->n_voltages)
 41                 return -EINVAL;
 42 
 43         if (selector == rdev->desc->n_voltages - 1)
 44                 return 1800000;
 45         else
 46                 return rdev->desc->min_uV + (rdev->desc->uV_step * selector);
 47 }
 48 
 49 static int arizona_ldo1_hc_map_voltage(struct regulator_dev *rdev,
 50                                        int min_uV, int max_uV)
 51 {
 52         int sel;
 53 
 54         sel = DIV_ROUND_UP(min_uV - rdev->desc->min_uV, rdev->desc->uV_step);
 55         if (sel >= rdev->desc->n_voltages)
 56                 sel = rdev->desc->n_voltages - 1;
 57 
 58         return sel;
 59 }
 60 
 61 static int arizona_ldo1_hc_set_voltage_sel(struct regulator_dev *rdev,
 62                                            unsigned sel)
 63 {
 64         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
 65         struct regmap *regmap = ldo->arizona->regmap;
 66         unsigned int val;
 67         int ret;
 68 
 69         if (sel == rdev->desc->n_voltages - 1)
 70                 val = ARIZONA_LDO1_HI_PWR;
 71         else
 72                 val = 0;
 73 
 74         ret = regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_2,
 75                                  ARIZONA_LDO1_HI_PWR, val);
 76         if (ret != 0)
 77                 return ret;
 78 
 79         ret = regmap_update_bits(regmap, ARIZONA_DYNAMIC_FREQUENCY_SCALING_1,
 80                                  ARIZONA_SUBSYS_MAX_FREQ, val);
 81         if (ret != 0)
 82                 return ret;
 83 
 84         if (val)
 85                 return 0;
 86 
 87         val = sel << ARIZONA_LDO1_VSEL_SHIFT;
 88 
 89         return regmap_update_bits(regmap, ARIZONA_LDO1_CONTROL_1,
 90                                   ARIZONA_LDO1_VSEL_MASK, val);
 91 }
 92 
 93 static int arizona_ldo1_hc_get_voltage_sel(struct regulator_dev *rdev)
 94 {
 95         struct arizona_ldo1 *ldo = rdev_get_drvdata(rdev);
 96         struct regmap *regmap = ldo->arizona->regmap;
 97         unsigned int val;
 98         int ret;
 99 
100         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_2, &val);
101         if (ret != 0)
102                 return ret;
103 
104         if (val & ARIZONA_LDO1_HI_PWR)
105                 return rdev->desc->n_voltages - 1;
106 
107         ret = regmap_read(regmap, ARIZONA_LDO1_CONTROL_1, &val);
108         if (ret != 0)
109                 return ret;
110 
111         return (val & ARIZONA_LDO1_VSEL_MASK) >> ARIZONA_LDO1_VSEL_SHIFT;
112 }
113 
114 static struct regulator_ops arizona_ldo1_hc_ops = {
115         .list_voltage = arizona_ldo1_hc_list_voltage,
116         .map_voltage = arizona_ldo1_hc_map_voltage,
117         .get_voltage_sel = arizona_ldo1_hc_get_voltage_sel,
118         .set_voltage_sel = arizona_ldo1_hc_set_voltage_sel,
119         .get_bypass = regulator_get_bypass_regmap,
120         .set_bypass = regulator_set_bypass_regmap,
121 };
122 
123 static const struct regulator_desc arizona_ldo1_hc = {
124         .name = "LDO1",
125         .supply_name = "LDOVDD",
126         .type = REGULATOR_VOLTAGE,
127         .ops = &arizona_ldo1_hc_ops,
128 
129         .bypass_reg = ARIZONA_LDO1_CONTROL_1,
130         .bypass_mask = ARIZONA_LDO1_BYPASS,
131         .min_uV = 900000,
132         .uV_step = 50000,
133         .n_voltages = 8,
134         .enable_time = 1500,
135 
136         .owner = THIS_MODULE,
137 };
138 
139 static struct regulator_ops arizona_ldo1_ops = {
140         .list_voltage = regulator_list_voltage_linear,
141         .map_voltage = regulator_map_voltage_linear,
142         .get_voltage_sel = regulator_get_voltage_sel_regmap,
143         .set_voltage_sel = regulator_set_voltage_sel_regmap,
144         .get_bypass = regulator_get_bypass_regmap,
145         .set_bypass = regulator_set_bypass_regmap,
146 };
147 
148 static const struct regulator_desc arizona_ldo1 = {
149         .name = "LDO1",
150         .supply_name = "LDOVDD",
151         .type = REGULATOR_VOLTAGE,
152         .ops = &arizona_ldo1_ops,
153 
154         .vsel_reg = ARIZONA_LDO1_CONTROL_1,
155         .vsel_mask = ARIZONA_LDO1_VSEL_MASK,
156         .min_uV = 900000,
157         .uV_step = 25000,
158         .n_voltages = 13,
159         .enable_time = 500,
160 
161         .owner = THIS_MODULE,
162 };
163 
164 static const struct regulator_init_data arizona_ldo1_dvfs = {
165         .constraints = {
166                 .min_uV = 1200000,
167                 .max_uV = 1800000,
168                 .valid_ops_mask = REGULATOR_CHANGE_STATUS |
169                                   REGULATOR_CHANGE_VOLTAGE,
170         },
171         .num_consumer_supplies = 1,
172 };
173 
174 static const struct regulator_init_data arizona_ldo1_default = {
175         .constraints = {
176                 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
177         },
178         .num_consumer_supplies = 1,
179 };
180 
181 static int arizona_ldo1_probe(struct platform_device *pdev)
182 {
183         struct arizona *arizona = dev_get_drvdata(pdev->dev.parent);
184         const struct regulator_desc *desc;
185         struct regulator_config config = { };
186         struct arizona_ldo1 *ldo1;
187         int ret;
188 
189         ldo1 = devm_kzalloc(&pdev->dev, sizeof(*ldo1), GFP_KERNEL);
190         if (!ldo1)
191                 return -ENOMEM;
192 
193         ldo1->arizona = arizona;
194 
195         /*
196          * Since the chip usually supplies itself we provide some
197          * default init_data for it.  This will be overridden with
198          * platform data if provided.
199          */
200         switch (arizona->type) {
201         case WM5102:
202         case WM8997:
203                 desc = &arizona_ldo1_hc;
204                 ldo1->init_data = arizona_ldo1_dvfs;
205                 break;
206         default:
207                 desc = &arizona_ldo1;
208                 ldo1->init_data = arizona_ldo1_default;
209                 break;
210         }
211 
212         ldo1->init_data.consumer_supplies = &ldo1->supply;
213         ldo1->supply.supply = "DCVDD";
214         ldo1->supply.dev_name = dev_name(arizona->dev);
215 
216         config.dev = arizona->dev;
217         config.driver_data = ldo1;
218         config.regmap = arizona->regmap;
219         config.ena_gpio = arizona->pdata.ldoena;
220 
221         if (arizona->pdata.ldo1)
222                 config.init_data = arizona->pdata.ldo1;
223         else
224                 config.init_data = &ldo1->init_data;
225 
226         ldo1->regulator = devm_regulator_register(&pdev->dev, desc, &config);
227         if (IS_ERR(ldo1->regulator)) {
228                 ret = PTR_ERR(ldo1->regulator);
229                 dev_err(arizona->dev, "Failed to register LDO1 supply: %d\n",
230                         ret);
231                 return ret;
232         }
233 
234         platform_set_drvdata(pdev, ldo1);
235 
236         return 0;
237 }
238 
239 static struct platform_driver arizona_ldo1_driver = {
240         .probe = arizona_ldo1_probe,
241         .driver         = {
242                 .name   = "arizona-ldo1",
243                 .owner  = THIS_MODULE,
244         },
245 };
246 
247 module_platform_driver(arizona_ldo1_driver);
248 
249 /* Module information */
250 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
251 MODULE_DESCRIPTION("Arizona LDO1 driver");
252 MODULE_LICENSE("GPL");
253 MODULE_ALIAS("platform:arizona-ldo1");
254 

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