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Linux/drivers/regulator/wm8994-regulator.c

  1 /*
  2  * wm8994-regulator.c  --  Regulator driver for the WM8994
  3  *
  4  * Copyright 2009 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/wm8994/core.h>
 26 #include <linux/mfd/wm8994/registers.h>
 27 #include <linux/mfd/wm8994/pdata.h>
 28 
 29 struct wm8994_ldo {
 30         struct regulator_dev *regulator;
 31         struct wm8994 *wm8994;
 32         struct regulator_consumer_supply supply;
 33         struct regulator_init_data init_data;
 34 };
 35 
 36 #define WM8994_LDO1_MAX_SELECTOR 0x7
 37 #define WM8994_LDO2_MAX_SELECTOR 0x3
 38 
 39 static struct regulator_ops wm8994_ldo1_ops = {
 40         .list_voltage = regulator_list_voltage_linear,
 41         .map_voltage = regulator_map_voltage_linear,
 42         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 43         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 44 };
 45 
 46 static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
 47                                     unsigned int selector)
 48 {
 49         struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
 50 
 51         if (selector > WM8994_LDO2_MAX_SELECTOR)
 52                 return -EINVAL;
 53 
 54         switch (ldo->wm8994->type) {
 55         case WM8994:
 56                 return (selector * 100000) + 900000;
 57         case WM8958:
 58                 return (selector * 100000) + 1000000;
 59         case WM1811:
 60                 switch (selector) {
 61                 case 0:
 62                         return -EINVAL;
 63                 default:
 64                         return (selector * 100000) + 950000;
 65                 }
 66                 break;
 67         default:
 68                 return -EINVAL;
 69         }
 70 }
 71 
 72 static struct regulator_ops wm8994_ldo2_ops = {
 73         .list_voltage = wm8994_ldo2_list_voltage,
 74         .get_voltage_sel = regulator_get_voltage_sel_regmap,
 75         .set_voltage_sel = regulator_set_voltage_sel_regmap,
 76 };
 77 
 78 static const struct regulator_desc wm8994_ldo_desc[] = {
 79         {
 80                 .name = "LDO1",
 81                 .id = 1,
 82                 .type = REGULATOR_VOLTAGE,
 83                 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
 84                 .vsel_reg = WM8994_LDO_1,
 85                 .vsel_mask = WM8994_LDO1_VSEL_MASK,
 86                 .ops = &wm8994_ldo1_ops,
 87                 .min_uV = 2400000,
 88                 .uV_step = 100000,
 89                 .enable_time = 3000,
 90                 .owner = THIS_MODULE,
 91         },
 92         {
 93                 .name = "LDO2",
 94                 .id = 2,
 95                 .type = REGULATOR_VOLTAGE,
 96                 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
 97                 .vsel_reg = WM8994_LDO_2,
 98                 .vsel_mask = WM8994_LDO2_VSEL_MASK,
 99                 .ops = &wm8994_ldo2_ops,
100                 .enable_time = 3000,
101                 .owner = THIS_MODULE,
102         },
103 };
104 
105 static const struct regulator_consumer_supply wm8994_ldo_consumer[] = {
106         { .supply = "AVDD1" },
107         { .supply = "DCVDD" },
108 };
109 
110 static const struct regulator_init_data wm8994_ldo_default[] = {
111         {
112                 .constraints = {
113                         .valid_ops_mask = REGULATOR_CHANGE_STATUS,
114                 },
115                 .num_consumer_supplies = 1,
116         },
117         {
118                 .constraints = {
119                         .valid_ops_mask = REGULATOR_CHANGE_STATUS,
120                 },
121                 .num_consumer_supplies = 1,
122         },
123 };
124 
125 static int wm8994_ldo_probe(struct platform_device *pdev)
126 {
127         struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
128         struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
129         int id = pdev->id % ARRAY_SIZE(pdata->ldo);
130         struct regulator_config config = { };
131         struct wm8994_ldo *ldo;
132         int ret;
133 
134         dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
135 
136         ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
137         if (!ldo)
138                 return -ENOMEM;
139 
140         ldo->wm8994 = wm8994;
141         ldo->supply = wm8994_ldo_consumer[id];
142         ldo->supply.dev_name = dev_name(wm8994->dev);
143 
144         config.dev = wm8994->dev;
145         config.driver_data = ldo;
146         config.regmap = wm8994->regmap;
147         config.init_data = &ldo->init_data;
148         if (pdata)
149                 config.ena_gpio = pdata->ldo[id].enable;
150         else if (wm8994->dev->of_node)
151                 config.ena_gpio = wm8994->pdata.ldo[id].enable;
152 
153         /* Use default constraints if none set up */
154         if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) {
155                 dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n",
156                         ldo->supply.dev_name, ldo->supply.supply);
157 
158                 ldo->init_data = wm8994_ldo_default[id];
159                 ldo->init_data.consumer_supplies = &ldo->supply;
160                 if (!config.ena_gpio)
161                         ldo->init_data.constraints.valid_ops_mask = 0;
162         } else {
163                 ldo->init_data = *pdata->ldo[id].init_data;
164         }
165 
166         ldo->regulator = devm_regulator_register(&pdev->dev,
167                                                  &wm8994_ldo_desc[id],
168                                                  &config);
169         if (IS_ERR(ldo->regulator)) {
170                 ret = PTR_ERR(ldo->regulator);
171                 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
172                         id + 1, ret);
173                 goto err;
174         }
175 
176         platform_set_drvdata(pdev, ldo);
177 
178         return 0;
179 
180 err:
181         return ret;
182 }
183 
184 static struct platform_driver wm8994_ldo_driver = {
185         .probe = wm8994_ldo_probe,
186         .driver         = {
187                 .name   = "wm8994-ldo",
188                 .owner  = THIS_MODULE,
189         },
190 };
191 
192 module_platform_driver(wm8994_ldo_driver);
193 
194 /* Module information */
195 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
196 MODULE_DESCRIPTION("WM8994 LDO driver");
197 MODULE_LICENSE("GPL");
198 MODULE_ALIAS("platform:wm8994-ldo");
199 

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