Merge branch 'x86/cpu' into x86/asm, to avoid conflict
[linux-2.6-microblaze.git] / 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 const 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 const 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                 config.ena_gpio_initialized = true;
153         }
154
155         /* Use default constraints if none set up */
156         if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) {
157                 dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n",
158                         ldo->supply.dev_name, ldo->supply.supply);
159
160                 ldo->init_data = wm8994_ldo_default[id];
161                 ldo->init_data.consumer_supplies = &ldo->supply;
162                 if (!config.ena_gpio)
163                         ldo->init_data.constraints.valid_ops_mask = 0;
164         } else {
165                 ldo->init_data = *pdata->ldo[id].init_data;
166         }
167
168         ldo->regulator = devm_regulator_register(&pdev->dev,
169                                                  &wm8994_ldo_desc[id],
170                                                  &config);
171         if (IS_ERR(ldo->regulator)) {
172                 ret = PTR_ERR(ldo->regulator);
173                 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
174                         id + 1, ret);
175                 goto err;
176         }
177
178         platform_set_drvdata(pdev, ldo);
179
180         return 0;
181
182 err:
183         return ret;
184 }
185
186 static struct platform_driver wm8994_ldo_driver = {
187         .probe = wm8994_ldo_probe,
188         .driver         = {
189                 .name   = "wm8994-ldo",
190         },
191 };
192
193 module_platform_driver(wm8994_ldo_driver);
194
195 /* Module information */
196 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
197 MODULE_DESCRIPTION("WM8994 LDO driver");
198 MODULE_LICENSE("GPL");
199 MODULE_ALIAS("platform:wm8994-ldo");