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Linux kernel mirror (for testing)
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1// SPDX-License-Identifier: GPL-2.0+
2//
3// wm8994-regulator.c -- Regulator driver for the WM8994
4//
5// Copyright 2009 Wolfson Microelectronics PLC.
6//
7// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8
9#include <linux/module.h>
10#include <linux/moduleparam.h>
11#include <linux/init.h>
12#include <linux/bitops.h>
13#include <linux/err.h>
14#include <linux/platform_device.h>
15#include <linux/regulator/driver.h>
16#include <linux/regulator/machine.h>
17#include <linux/gpio/consumer.h>
18#include <linux/slab.h>
19
20#include <linux/mfd/wm8994/core.h>
21#include <linux/mfd/wm8994/registers.h>
22#include <linux/mfd/wm8994/pdata.h>
23
24struct wm8994_ldo {
25 struct regulator_dev *regulator;
26 struct wm8994 *wm8994;
27 struct regulator_consumer_supply supply;
28 struct regulator_init_data init_data;
29};
30
31#define WM8994_LDO1_MAX_SELECTOR 0x7
32#define WM8994_LDO2_MAX_SELECTOR 0x3
33
34static const struct regulator_ops wm8994_ldo1_ops = {
35 .list_voltage = regulator_list_voltage_linear,
36 .map_voltage = regulator_map_voltage_linear,
37 .get_voltage_sel = regulator_get_voltage_sel_regmap,
38 .set_voltage_sel = regulator_set_voltage_sel_regmap,
39};
40
41static int wm8994_ldo2_list_voltage(struct regulator_dev *rdev,
42 unsigned int selector)
43{
44 struct wm8994_ldo *ldo = rdev_get_drvdata(rdev);
45
46 if (selector > WM8994_LDO2_MAX_SELECTOR)
47 return -EINVAL;
48
49 switch (ldo->wm8994->type) {
50 case WM8994:
51 return (selector * 100000) + 900000;
52 case WM8958:
53 return (selector * 100000) + 1000000;
54 case WM1811:
55 switch (selector) {
56 case 0:
57 return -EINVAL;
58 default:
59 return (selector * 100000) + 950000;
60 }
61 break;
62 default:
63 return -EINVAL;
64 }
65}
66
67static const struct regulator_ops wm8994_ldo2_ops = {
68 .list_voltage = wm8994_ldo2_list_voltage,
69 .get_voltage_sel = regulator_get_voltage_sel_regmap,
70 .set_voltage_sel = regulator_set_voltage_sel_regmap,
71};
72
73static const struct regulator_desc wm8994_ldo_desc[] = {
74 {
75 .name = "LDO1",
76 .id = 1,
77 .type = REGULATOR_VOLTAGE,
78 .n_voltages = WM8994_LDO1_MAX_SELECTOR + 1,
79 .vsel_reg = WM8994_LDO_1,
80 .vsel_mask = WM8994_LDO1_VSEL_MASK,
81 .ops = &wm8994_ldo1_ops,
82 .min_uV = 2400000,
83 .uV_step = 100000,
84 .enable_time = 3000,
85 .owner = THIS_MODULE,
86 },
87 {
88 .name = "LDO2",
89 .id = 2,
90 .type = REGULATOR_VOLTAGE,
91 .n_voltages = WM8994_LDO2_MAX_SELECTOR + 1,
92 .vsel_reg = WM8994_LDO_2,
93 .vsel_mask = WM8994_LDO2_VSEL_MASK,
94 .ops = &wm8994_ldo2_ops,
95 .enable_time = 3000,
96 .owner = THIS_MODULE,
97 },
98};
99
100static const struct regulator_consumer_supply wm8994_ldo_consumer[] = {
101 { .supply = "AVDD1" },
102 { .supply = "DCVDD" },
103};
104
105static const struct regulator_init_data wm8994_ldo_default[] = {
106 {
107 .constraints = {
108 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
109 },
110 .num_consumer_supplies = 1,
111 },
112 {
113 .constraints = {
114 .valid_ops_mask = REGULATOR_CHANGE_STATUS,
115 },
116 .num_consumer_supplies = 1,
117 },
118};
119
120static int wm8994_ldo_probe(struct platform_device *pdev)
121{
122 struct wm8994 *wm8994 = dev_get_drvdata(pdev->dev.parent);
123 struct wm8994_pdata *pdata = dev_get_platdata(wm8994->dev);
124 int id = pdev->id % ARRAY_SIZE(pdata->ldo);
125 struct regulator_config config = { };
126 struct wm8994_ldo *ldo;
127 struct gpio_desc *gpiod;
128 int ret;
129
130 dev_dbg(&pdev->dev, "Probing LDO%d\n", id + 1);
131
132 ldo = devm_kzalloc(&pdev->dev, sizeof(struct wm8994_ldo), GFP_KERNEL);
133 if (!ldo)
134 return -ENOMEM;
135
136 ldo->wm8994 = wm8994;
137 ldo->supply = wm8994_ldo_consumer[id];
138 ldo->supply.dev_name = dev_name(wm8994->dev);
139
140 config.dev = wm8994->dev;
141 config.driver_data = ldo;
142 config.regmap = wm8994->regmap;
143 config.init_data = &ldo->init_data;
144
145 /*
146 * Look up LDO enable GPIO from the parent device node, we don't
147 * use devm because the regulator core will free the GPIO
148 */
149 gpiod = gpiod_get_optional(pdev->dev.parent,
150 id ? "wlf,ldo2ena" : "wlf,ldo1ena",
151 GPIOD_OUT_LOW |
152 GPIOD_FLAGS_BIT_NONEXCLUSIVE);
153 if (IS_ERR(gpiod))
154 return PTR_ERR(gpiod);
155 config.ena_gpiod = gpiod;
156
157 /* Use default constraints if none set up */
158 if (!pdata || !pdata->ldo[id].init_data || wm8994->dev->of_node) {
159 dev_dbg(wm8994->dev, "Using default init data, supply %s %s\n",
160 ldo->supply.dev_name, ldo->supply.supply);
161
162 ldo->init_data = wm8994_ldo_default[id];
163 ldo->init_data.consumer_supplies = &ldo->supply;
164 if (!gpiod)
165 ldo->init_data.constraints.valid_ops_mask = 0;
166 } else {
167 ldo->init_data = *pdata->ldo[id].init_data;
168 }
169
170 /*
171 * At this point the GPIO descriptor is handled over to the
172 * regulator core and we need not worry about it on the
173 * error path.
174 */
175 ldo->regulator = devm_regulator_register(&pdev->dev,
176 &wm8994_ldo_desc[id],
177 &config);
178 if (IS_ERR(ldo->regulator)) {
179 ret = PTR_ERR(ldo->regulator);
180 dev_err(wm8994->dev, "Failed to register LDO%d: %d\n",
181 id + 1, ret);
182 return ret;
183 }
184
185 platform_set_drvdata(pdev, ldo);
186
187 return 0;
188}
189
190static struct platform_driver wm8994_ldo_driver = {
191 .probe = wm8994_ldo_probe,
192 .driver = {
193 .name = "wm8994-ldo",
194 },
195};
196
197module_platform_driver(wm8994_ldo_driver);
198
199/* Module information */
200MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
201MODULE_DESCRIPTION("WM8994 LDO driver");
202MODULE_LICENSE("GPL");
203MODULE_ALIAS("platform:wm8994-ldo");